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62 |
marcus.erl |
/*
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* esp.c - driver for Hayes ESP serial cards
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*
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* --- Notices from serial.c, upon which this driver is based ---
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*
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* Extensively rewritten by Theodore Ts'o, 8/16/92 -- 9/14/92. Now
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* much more extensible to support other serial cards based on the
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* 16450/16550A UART's. Added support for the AST FourPort and the
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* Accent Async board.
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*
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* set_serial_info fixed to set the flags, custom divisor, and uart
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* type fields. Fix suggested by Michael K. Johnson 12/12/92.
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*
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* 11/95: TIOCMIWAIT, TIOCGICOUNT by Angelo Haritsis <ah@doc.ic.ac.uk>
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*
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* 03/96: Modularised by Angelo Haritsis <ah@doc.ic.ac.uk>
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*
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* rs_set_termios fixed to look also for changes of the input
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* flags INPCK, BRKINT, PARMRK, IGNPAR and IGNBRK.
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* Bernd Anhäupl 05/17/96.
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*
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* --- End of notices from serial.c ---
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*
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* Support for the ESP serial card by Andrew J. Robinson
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* <arobinso@nyx.net> (Card detection routine taken from a patch
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* by Dennis J. Boylan). Patches to allow use with 2.1.x contributed
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* by Chris Faylor.
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*
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* Most recent changes: (Andrew J. Robinson)
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* Support for PIO mode. This allows the driver to work properly with
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* multiport cards.
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*
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* Arnaldo Carvalho de Melo <acme@conectiva.com.br> -
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* several cleanups, use module_init/module_exit, etc
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*
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* This module exports the following rs232 io functions:
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*
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* int espserial_init(void);
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*/
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/interrupt.h>
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#include <linux/tty.h>
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#include <linux/tty_flip.h>
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#include <linux/serial.h>
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#include <linux/serialP.h>
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#include <linux/serial_reg.h>
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#include <linux/major.h>
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#include <linux/string.h>
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#include <linux/fcntl.h>
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#include <linux/ptrace.h>
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#include <linux/ioport.h>
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#include <linux/mm.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/bitops.h>
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#include <asm/system.h>
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#include <asm/io.h>
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#include <asm/dma.h>
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#include <linux/slab.h>
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#include <asm/uaccess.h>
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#include <linux/hayesesp.h>
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#define NR_PORTS 64 /* maximum number of ports */
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#define NR_PRIMARY 8 /* maximum number of primary ports */
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#define REGION_SIZE 8 /* size of io region to request */
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/* The following variables can be set by giving module options */
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static int irq[NR_PRIMARY]; /* IRQ for each base port */
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static unsigned int divisor[NR_PRIMARY]; /* custom divisor for each port */
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static unsigned int dma = ESP_DMA_CHANNEL; /* DMA channel */
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static unsigned int rx_trigger = ESP_RX_TRIGGER;
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static unsigned int tx_trigger = ESP_TX_TRIGGER;
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static unsigned int flow_off = ESP_FLOW_OFF;
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static unsigned int flow_on = ESP_FLOW_ON;
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static unsigned int rx_timeout = ESP_RX_TMOUT;
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static unsigned int pio_threshold = ESP_PIO_THRESHOLD;
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MODULE_LICENSE("GPL");
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module_param_array(irq, int, NULL, 0);
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module_param_array(divisor, uint, NULL, 0);
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module_param(dma, uint, 0);
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module_param(rx_trigger, uint, 0);
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module_param(tx_trigger, uint, 0);
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module_param(flow_off, uint, 0);
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module_param(flow_on, uint, 0);
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module_param(rx_timeout, uint, 0);
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module_param(pio_threshold, uint, 0);
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/* END */
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static char *dma_buffer;
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static int dma_bytes;
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static struct esp_pio_buffer *free_pio_buf;
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| 105 |
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#define DMA_BUFFER_SZ 1024
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#define WAKEUP_CHARS 1024
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static char serial_name[] __initdata = "ESP serial driver";
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static char serial_version[] __initdata = "2.2";
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static struct tty_driver *esp_driver;
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/* serial subtype definitions */
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#define SERIAL_TYPE_NORMAL 1
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/*
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* Serial driver configuration section. Here are the various options:
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*
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* SERIAL_PARANOIA_CHECK
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* Check the magic number for the esp_structure where
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* ever possible.
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*/
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#undef SERIAL_PARANOIA_CHECK
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#define SERIAL_DO_RESTART
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#undef SERIAL_DEBUG_INTR
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#undef SERIAL_DEBUG_OPEN
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#undef SERIAL_DEBUG_FLOW
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#if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
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#define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
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tty->name, (info->flags), serial_driver.refcount,info->count,tty->count,s)
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#else
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#define DBG_CNT(s)
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#endif
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| 139 |
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static struct esp_struct *ports;
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static void change_speed(struct esp_struct *info);
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static void rs_wait_until_sent(struct tty_struct *, int);
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/*
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* The ESP card has a clock rate of 14.7456 MHz (that is, 2**ESPC_SCALE
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* times the normal 1.8432 Mhz clock of most serial boards).
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*/
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#define BASE_BAUD ((1843200 / 16) * (1 << ESPC_SCALE))
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/* Standard COM flags (except for COM4, because of the 8514 problem) */
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#define STD_COM_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST)
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static inline int serial_paranoia_check(struct esp_struct *info,
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char *name, const char *routine)
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{
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#ifdef SERIAL_PARANOIA_CHECK
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static const char badmagic[] = KERN_WARNING
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"Warning: bad magic number for serial struct (%s) in %s\n";
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static const char badinfo[] = KERN_WARNING
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"Warning: null esp_struct for (%s) in %s\n";
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if (!info) {
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printk(badinfo, name, routine);
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return 1;
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}
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if (info->magic != ESP_MAGIC) {
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printk(badmagic, name, routine);
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return 1;
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}
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#endif
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return 0;
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}
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static inline unsigned int serial_in(struct esp_struct *info, int offset)
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{
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return inb(info->port + offset);
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}
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static inline void serial_out(struct esp_struct *info, int offset,
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unsigned char value)
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{
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outb(value, info->port+offset);
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}
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/*
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* ------------------------------------------------------------
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* rs_stop() and rs_start()
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*
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* This routines are called before setting or resetting tty->stopped.
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* They enable or disable transmitter interrupts, as necessary.
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* ------------------------------------------------------------
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*/
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static void rs_stop(struct tty_struct *tty)
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{
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struct esp_struct *info = (struct esp_struct *)tty->driver_data;
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unsigned long flags;
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if (serial_paranoia_check(info, tty->name, "rs_stop"))
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return;
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| 201 |
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spin_lock_irqsave(&info->lock, flags);
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if (info->IER & UART_IER_THRI) {
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info->IER &= ~UART_IER_THRI;
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serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
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serial_out(info, UART_ESI_CMD2, info->IER);
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}
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spin_unlock_irqrestore(&info->lock, flags);
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}
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| 210 |
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static void rs_start(struct tty_struct *tty)
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{
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struct esp_struct *info = (struct esp_struct *)tty->driver_data;
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unsigned long flags;
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if (serial_paranoia_check(info, tty->name, "rs_start"))
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return;
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spin_lock_irqsave(&info->lock, flags);
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if (info->xmit_cnt && info->xmit_buf && !(info->IER & UART_IER_THRI)) {
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info->IER |= UART_IER_THRI;
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serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
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serial_out(info, UART_ESI_CMD2, info->IER);
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}
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spin_unlock_irqrestore(&info->lock, flags);
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}
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/*
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* ----------------------------------------------------------------------
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*
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* Here starts the interrupt handling routines. All of the following
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* subroutines are declared as inline and are folded into
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* rs_interrupt(). They were separated out for readability's sake.
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*
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* Note: rs_interrupt() is a "fast" interrupt, which means that it
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* runs with interrupts turned off. People who may want to modify
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* rs_interrupt() should try to keep the interrupt handler as fast as
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* possible. After you are done making modifications, it is not a bad
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* idea to do:
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*
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| 240 |
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* gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
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*
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| 242 |
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* and look at the resulting assemble code in serial.s.
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| 243 |
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*
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| 244 |
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* - Ted Ts'o (tytso@mit.edu), 7-Mar-93
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* -----------------------------------------------------------------------
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*/
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| 248 |
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/*
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| 249 |
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* This routine is used by the interrupt handler to schedule
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| 250 |
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* processing in the software interrupt portion of the driver.
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*/
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| 252 |
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static inline void rs_sched_event(struct esp_struct *info,
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| 253 |
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int event)
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| 254 |
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{
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| 255 |
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info->event |= 1 << event;
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| 256 |
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schedule_work(&info->tqueue);
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| 257 |
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}
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| 258 |
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| 259 |
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static DEFINE_SPINLOCK(pio_lock);
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| 260 |
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| 261 |
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static inline struct esp_pio_buffer *get_pio_buffer(void)
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| 262 |
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{
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| 263 |
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struct esp_pio_buffer *buf;
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| 264 |
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unsigned long flags;
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| 265 |
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| 266 |
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spin_lock_irqsave(&pio_lock, flags);
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| 267 |
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if (free_pio_buf) {
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| 268 |
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buf = free_pio_buf;
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| 269 |
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free_pio_buf = buf->next;
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| 270 |
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} else {
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| 271 |
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buf = kmalloc(sizeof(struct esp_pio_buffer), GFP_ATOMIC);
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| 272 |
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}
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| 273 |
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spin_unlock_irqrestore(&pio_lock, flags);
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| 274 |
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return buf;
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| 275 |
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}
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| 276 |
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| 277 |
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static inline void release_pio_buffer(struct esp_pio_buffer *buf)
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| 278 |
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{
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| 279 |
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unsigned long flags;
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| 280 |
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spin_lock_irqsave(&pio_lock, flags);
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| 281 |
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buf->next = free_pio_buf;
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| 282 |
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free_pio_buf = buf;
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| 283 |
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spin_unlock_irqrestore(&pio_lock, flags);
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| 284 |
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}
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| 285 |
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| 286 |
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static inline void receive_chars_pio(struct esp_struct *info, int num_bytes)
|
| 287 |
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{
|
| 288 |
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struct tty_struct *tty = info->tty;
|
| 289 |
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int i;
|
| 290 |
|
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struct esp_pio_buffer *pio_buf;
|
| 291 |
|
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struct esp_pio_buffer *err_buf;
|
| 292 |
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unsigned char status_mask;
|
| 293 |
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|
| 294 |
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pio_buf = get_pio_buffer();
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| 295 |
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| 296 |
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if (!pio_buf)
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| 297 |
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return;
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| 298 |
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| 299 |
|
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err_buf = get_pio_buffer();
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| 300 |
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| 301 |
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if (!err_buf) {
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| 302 |
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release_pio_buffer(pio_buf);
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| 303 |
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return;
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| 304 |
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}
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| 305 |
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| 306 |
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status_mask = (info->read_status_mask >> 2) & 0x07;
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| 307 |
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| 308 |
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for (i = 0; i < num_bytes - 1; i += 2) {
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| 309 |
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*((unsigned short *)(pio_buf->data + i)) =
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| 310 |
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inw(info->port + UART_ESI_RX);
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| 311 |
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err_buf->data[i] = serial_in(info, UART_ESI_RWS);
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| 312 |
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err_buf->data[i + 1] = (err_buf->data[i] >> 3) & status_mask;
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| 313 |
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err_buf->data[i] &= status_mask;
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| 314 |
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}
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| 315 |
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| 316 |
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if (num_bytes & 0x0001) {
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| 317 |
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pio_buf->data[num_bytes - 1] = serial_in(info, UART_ESI_RX);
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| 318 |
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err_buf->data[num_bytes - 1] =
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| 319 |
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(serial_in(info, UART_ESI_RWS) >> 3) & status_mask;
|
| 320 |
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}
|
| 321 |
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|
| 322 |
|
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/* make sure everything is still ok since interrupts were enabled */
|
| 323 |
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tty = info->tty;
|
| 324 |
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|
| 325 |
|
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if (!tty) {
|
| 326 |
|
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release_pio_buffer(pio_buf);
|
| 327 |
|
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release_pio_buffer(err_buf);
|
| 328 |
|
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info->stat_flags &= ~ESP_STAT_RX_TIMEOUT;
|
| 329 |
|
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return;
|
| 330 |
|
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}
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| 331 |
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|
| 332 |
|
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status_mask = (info->ignore_status_mask >> 2) & 0x07;
|
| 333 |
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|
| 334 |
|
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for (i = 0; i < num_bytes; i++) {
|
| 335 |
|
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if (!(err_buf->data[i] & status_mask)) {
|
| 336 |
|
|
int flag = 0;
|
| 337 |
|
|
|
| 338 |
|
|
if (err_buf->data[i] & 0x04) {
|
| 339 |
|
|
flag = TTY_BREAK;
|
| 340 |
|
|
if (info->flags & ASYNC_SAK)
|
| 341 |
|
|
do_SAK(tty);
|
| 342 |
|
|
}
|
| 343 |
|
|
else if (err_buf->data[i] & 0x02)
|
| 344 |
|
|
flag = TTY_FRAME;
|
| 345 |
|
|
else if (err_buf->data[i] & 0x01)
|
| 346 |
|
|
flag = TTY_PARITY;
|
| 347 |
|
|
tty_insert_flip_char(tty, pio_buf->data[i], flag);
|
| 348 |
|
|
}
|
| 349 |
|
|
}
|
| 350 |
|
|
|
| 351 |
|
|
tty_schedule_flip(tty);
|
| 352 |
|
|
|
| 353 |
|
|
info->stat_flags &= ~ESP_STAT_RX_TIMEOUT;
|
| 354 |
|
|
release_pio_buffer(pio_buf);
|
| 355 |
|
|
release_pio_buffer(err_buf);
|
| 356 |
|
|
}
|
| 357 |
|
|
|
| 358 |
|
|
static inline void receive_chars_dma(struct esp_struct *info, int num_bytes)
|
| 359 |
|
|
{
|
| 360 |
|
|
unsigned long flags;
|
| 361 |
|
|
info->stat_flags &= ~ESP_STAT_RX_TIMEOUT;
|
| 362 |
|
|
dma_bytes = num_bytes;
|
| 363 |
|
|
info->stat_flags |= ESP_STAT_DMA_RX;
|
| 364 |
|
|
|
| 365 |
|
|
flags=claim_dma_lock();
|
| 366 |
|
|
disable_dma(dma);
|
| 367 |
|
|
clear_dma_ff(dma);
|
| 368 |
|
|
set_dma_mode(dma, DMA_MODE_READ);
|
| 369 |
|
|
set_dma_addr(dma, isa_virt_to_bus(dma_buffer));
|
| 370 |
|
|
set_dma_count(dma, dma_bytes);
|
| 371 |
|
|
enable_dma(dma);
|
| 372 |
|
|
release_dma_lock(flags);
|
| 373 |
|
|
|
| 374 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_START_DMA_RX);
|
| 375 |
|
|
}
|
| 376 |
|
|
|
| 377 |
|
|
static inline void receive_chars_dma_done(struct esp_struct *info,
|
| 378 |
|
|
int status)
|
| 379 |
|
|
{
|
| 380 |
|
|
struct tty_struct *tty = info->tty;
|
| 381 |
|
|
int num_bytes;
|
| 382 |
|
|
unsigned long flags;
|
| 383 |
|
|
|
| 384 |
|
|
flags=claim_dma_lock();
|
| 385 |
|
|
disable_dma(dma);
|
| 386 |
|
|
clear_dma_ff(dma);
|
| 387 |
|
|
|
| 388 |
|
|
info->stat_flags &= ~ESP_STAT_DMA_RX;
|
| 389 |
|
|
num_bytes = dma_bytes - get_dma_residue(dma);
|
| 390 |
|
|
release_dma_lock(flags);
|
| 391 |
|
|
|
| 392 |
|
|
info->icount.rx += num_bytes;
|
| 393 |
|
|
|
| 394 |
|
|
if (num_bytes > 0) {
|
| 395 |
|
|
tty_insert_flip_string(tty, dma_buffer, num_bytes - 1);
|
| 396 |
|
|
|
| 397 |
|
|
status &= (0x1c & info->read_status_mask);
|
| 398 |
|
|
|
| 399 |
|
|
/* Is the status significant or do we throw the last byte ? */
|
| 400 |
|
|
if (!(status & info->ignore_status_mask)) {
|
| 401 |
|
|
int statflag = 0;
|
| 402 |
|
|
|
| 403 |
|
|
if (status & 0x10) {
|
| 404 |
|
|
statflag = TTY_BREAK;
|
| 405 |
|
|
(info->icount.brk)++;
|
| 406 |
|
|
if (info->flags & ASYNC_SAK)
|
| 407 |
|
|
do_SAK(tty);
|
| 408 |
|
|
} else if (status & 0x08) {
|
| 409 |
|
|
statflag = TTY_FRAME;
|
| 410 |
|
|
(info->icount.frame)++;
|
| 411 |
|
|
}
|
| 412 |
|
|
else if (status & 0x04) {
|
| 413 |
|
|
statflag = TTY_PARITY;
|
| 414 |
|
|
(info->icount.parity)++;
|
| 415 |
|
|
}
|
| 416 |
|
|
tty_insert_flip_char(tty, dma_buffer[num_bytes - 1], statflag);
|
| 417 |
|
|
}
|
| 418 |
|
|
tty_schedule_flip(tty);
|
| 419 |
|
|
}
|
| 420 |
|
|
|
| 421 |
|
|
if (dma_bytes != num_bytes) {
|
| 422 |
|
|
num_bytes = dma_bytes - num_bytes;
|
| 423 |
|
|
dma_bytes = 0;
|
| 424 |
|
|
receive_chars_dma(info, num_bytes);
|
| 425 |
|
|
} else
|
| 426 |
|
|
dma_bytes = 0;
|
| 427 |
|
|
}
|
| 428 |
|
|
|
| 429 |
|
|
/* Caller must hold info->lock */
|
| 430 |
|
|
|
| 431 |
|
|
static inline void transmit_chars_pio(struct esp_struct *info,
|
| 432 |
|
|
int space_avail)
|
| 433 |
|
|
{
|
| 434 |
|
|
int i;
|
| 435 |
|
|
struct esp_pio_buffer *pio_buf;
|
| 436 |
|
|
|
| 437 |
|
|
pio_buf = get_pio_buffer();
|
| 438 |
|
|
|
| 439 |
|
|
if (!pio_buf)
|
| 440 |
|
|
return;
|
| 441 |
|
|
|
| 442 |
|
|
while (space_avail && info->xmit_cnt) {
|
| 443 |
|
|
if (info->xmit_tail + space_avail <= ESP_XMIT_SIZE) {
|
| 444 |
|
|
memcpy(pio_buf->data,
|
| 445 |
|
|
&(info->xmit_buf[info->xmit_tail]),
|
| 446 |
|
|
space_avail);
|
| 447 |
|
|
} else {
|
| 448 |
|
|
i = ESP_XMIT_SIZE - info->xmit_tail;
|
| 449 |
|
|
memcpy(pio_buf->data,
|
| 450 |
|
|
&(info->xmit_buf[info->xmit_tail]), i);
|
| 451 |
|
|
memcpy(&(pio_buf->data[i]), info->xmit_buf,
|
| 452 |
|
|
space_avail - i);
|
| 453 |
|
|
}
|
| 454 |
|
|
|
| 455 |
|
|
info->xmit_cnt -= space_avail;
|
| 456 |
|
|
info->xmit_tail = (info->xmit_tail + space_avail) &
|
| 457 |
|
|
(ESP_XMIT_SIZE - 1);
|
| 458 |
|
|
|
| 459 |
|
|
for (i = 0; i < space_avail - 1; i += 2) {
|
| 460 |
|
|
outw(*((unsigned short *)(pio_buf->data + i)),
|
| 461 |
|
|
info->port + UART_ESI_TX);
|
| 462 |
|
|
}
|
| 463 |
|
|
|
| 464 |
|
|
if (space_avail & 0x0001)
|
| 465 |
|
|
serial_out(info, UART_ESI_TX,
|
| 466 |
|
|
pio_buf->data[space_avail - 1]);
|
| 467 |
|
|
|
| 468 |
|
|
if (info->xmit_cnt) {
|
| 469 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
|
| 470 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
|
| 471 |
|
|
space_avail = serial_in(info, UART_ESI_STAT1) << 8;
|
| 472 |
|
|
space_avail |= serial_in(info, UART_ESI_STAT2);
|
| 473 |
|
|
|
| 474 |
|
|
if (space_avail > info->xmit_cnt)
|
| 475 |
|
|
space_avail = info->xmit_cnt;
|
| 476 |
|
|
}
|
| 477 |
|
|
}
|
| 478 |
|
|
|
| 479 |
|
|
if (info->xmit_cnt < WAKEUP_CHARS) {
|
| 480 |
|
|
rs_sched_event(info, ESP_EVENT_WRITE_WAKEUP);
|
| 481 |
|
|
|
| 482 |
|
|
#ifdef SERIAL_DEBUG_INTR
|
| 483 |
|
|
printk("THRE...");
|
| 484 |
|
|
#endif
|
| 485 |
|
|
|
| 486 |
|
|
if (info->xmit_cnt <= 0) {
|
| 487 |
|
|
info->IER &= ~UART_IER_THRI;
|
| 488 |
|
|
serial_out(info, UART_ESI_CMD1,
|
| 489 |
|
|
ESI_SET_SRV_MASK);
|
| 490 |
|
|
serial_out(info, UART_ESI_CMD2, info->IER);
|
| 491 |
|
|
}
|
| 492 |
|
|
}
|
| 493 |
|
|
|
| 494 |
|
|
release_pio_buffer(pio_buf);
|
| 495 |
|
|
}
|
| 496 |
|
|
|
| 497 |
|
|
/* Caller must hold info->lock */
|
| 498 |
|
|
static inline void transmit_chars_dma(struct esp_struct *info, int num_bytes)
|
| 499 |
|
|
{
|
| 500 |
|
|
unsigned long flags;
|
| 501 |
|
|
|
| 502 |
|
|
dma_bytes = num_bytes;
|
| 503 |
|
|
|
| 504 |
|
|
if (info->xmit_tail + dma_bytes <= ESP_XMIT_SIZE) {
|
| 505 |
|
|
memcpy(dma_buffer, &(info->xmit_buf[info->xmit_tail]),
|
| 506 |
|
|
dma_bytes);
|
| 507 |
|
|
} else {
|
| 508 |
|
|
int i = ESP_XMIT_SIZE - info->xmit_tail;
|
| 509 |
|
|
memcpy(dma_buffer, &(info->xmit_buf[info->xmit_tail]),
|
| 510 |
|
|
i);
|
| 511 |
|
|
memcpy(&(dma_buffer[i]), info->xmit_buf, dma_bytes - i);
|
| 512 |
|
|
}
|
| 513 |
|
|
|
| 514 |
|
|
info->xmit_cnt -= dma_bytes;
|
| 515 |
|
|
info->xmit_tail = (info->xmit_tail + dma_bytes) & (ESP_XMIT_SIZE - 1);
|
| 516 |
|
|
|
| 517 |
|
|
if (info->xmit_cnt < WAKEUP_CHARS) {
|
| 518 |
|
|
rs_sched_event(info, ESP_EVENT_WRITE_WAKEUP);
|
| 519 |
|
|
|
| 520 |
|
|
#ifdef SERIAL_DEBUG_INTR
|
| 521 |
|
|
printk("THRE...");
|
| 522 |
|
|
#endif
|
| 523 |
|
|
|
| 524 |
|
|
if (info->xmit_cnt <= 0) {
|
| 525 |
|
|
info->IER &= ~UART_IER_THRI;
|
| 526 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
|
| 527 |
|
|
serial_out(info, UART_ESI_CMD2, info->IER);
|
| 528 |
|
|
}
|
| 529 |
|
|
}
|
| 530 |
|
|
|
| 531 |
|
|
info->stat_flags |= ESP_STAT_DMA_TX;
|
| 532 |
|
|
|
| 533 |
|
|
flags=claim_dma_lock();
|
| 534 |
|
|
disable_dma(dma);
|
| 535 |
|
|
clear_dma_ff(dma);
|
| 536 |
|
|
set_dma_mode(dma, DMA_MODE_WRITE);
|
| 537 |
|
|
set_dma_addr(dma, isa_virt_to_bus(dma_buffer));
|
| 538 |
|
|
set_dma_count(dma, dma_bytes);
|
| 539 |
|
|
enable_dma(dma);
|
| 540 |
|
|
release_dma_lock(flags);
|
| 541 |
|
|
|
| 542 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_START_DMA_TX);
|
| 543 |
|
|
}
|
| 544 |
|
|
|
| 545 |
|
|
static inline void transmit_chars_dma_done(struct esp_struct *info)
|
| 546 |
|
|
{
|
| 547 |
|
|
int num_bytes;
|
| 548 |
|
|
unsigned long flags;
|
| 549 |
|
|
|
| 550 |
|
|
|
| 551 |
|
|
flags=claim_dma_lock();
|
| 552 |
|
|
disable_dma(dma);
|
| 553 |
|
|
clear_dma_ff(dma);
|
| 554 |
|
|
|
| 555 |
|
|
num_bytes = dma_bytes - get_dma_residue(dma);
|
| 556 |
|
|
info->icount.tx += dma_bytes;
|
| 557 |
|
|
release_dma_lock(flags);
|
| 558 |
|
|
|
| 559 |
|
|
if (dma_bytes != num_bytes) {
|
| 560 |
|
|
dma_bytes -= num_bytes;
|
| 561 |
|
|
memmove(dma_buffer, dma_buffer + num_bytes, dma_bytes);
|
| 562 |
|
|
|
| 563 |
|
|
flags=claim_dma_lock();
|
| 564 |
|
|
disable_dma(dma);
|
| 565 |
|
|
clear_dma_ff(dma);
|
| 566 |
|
|
set_dma_mode(dma, DMA_MODE_WRITE);
|
| 567 |
|
|
set_dma_addr(dma, isa_virt_to_bus(dma_buffer));
|
| 568 |
|
|
set_dma_count(dma, dma_bytes);
|
| 569 |
|
|
enable_dma(dma);
|
| 570 |
|
|
release_dma_lock(flags);
|
| 571 |
|
|
|
| 572 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_START_DMA_TX);
|
| 573 |
|
|
} else {
|
| 574 |
|
|
dma_bytes = 0;
|
| 575 |
|
|
info->stat_flags &= ~ESP_STAT_DMA_TX;
|
| 576 |
|
|
}
|
| 577 |
|
|
}
|
| 578 |
|
|
|
| 579 |
|
|
static inline void check_modem_status(struct esp_struct *info)
|
| 580 |
|
|
{
|
| 581 |
|
|
int status;
|
| 582 |
|
|
|
| 583 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
|
| 584 |
|
|
status = serial_in(info, UART_ESI_STAT2);
|
| 585 |
|
|
|
| 586 |
|
|
if (status & UART_MSR_ANY_DELTA) {
|
| 587 |
|
|
/* update input line counters */
|
| 588 |
|
|
if (status & UART_MSR_TERI)
|
| 589 |
|
|
info->icount.rng++;
|
| 590 |
|
|
if (status & UART_MSR_DDSR)
|
| 591 |
|
|
info->icount.dsr++;
|
| 592 |
|
|
if (status & UART_MSR_DDCD)
|
| 593 |
|
|
info->icount.dcd++;
|
| 594 |
|
|
if (status & UART_MSR_DCTS)
|
| 595 |
|
|
info->icount.cts++;
|
| 596 |
|
|
wake_up_interruptible(&info->delta_msr_wait);
|
| 597 |
|
|
}
|
| 598 |
|
|
|
| 599 |
|
|
if ((info->flags & ASYNC_CHECK_CD) && (status & UART_MSR_DDCD)) {
|
| 600 |
|
|
#if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
|
| 601 |
|
|
printk("ttys%d CD now %s...", info->line,
|
| 602 |
|
|
(status & UART_MSR_DCD) ? "on" : "off");
|
| 603 |
|
|
#endif
|
| 604 |
|
|
if (status & UART_MSR_DCD)
|
| 605 |
|
|
wake_up_interruptible(&info->open_wait);
|
| 606 |
|
|
else {
|
| 607 |
|
|
#ifdef SERIAL_DEBUG_OPEN
|
| 608 |
|
|
printk("scheduling hangup...");
|
| 609 |
|
|
#endif
|
| 610 |
|
|
schedule_work(&info->tqueue_hangup);
|
| 611 |
|
|
}
|
| 612 |
|
|
}
|
| 613 |
|
|
}
|
| 614 |
|
|
|
| 615 |
|
|
/*
|
| 616 |
|
|
* This is the serial driver's interrupt routine
|
| 617 |
|
|
*/
|
| 618 |
|
|
static irqreturn_t rs_interrupt_single(int irq, void *dev_id)
|
| 619 |
|
|
{
|
| 620 |
|
|
struct esp_struct * info;
|
| 621 |
|
|
unsigned err_status;
|
| 622 |
|
|
unsigned int scratch;
|
| 623 |
|
|
|
| 624 |
|
|
#ifdef SERIAL_DEBUG_INTR
|
| 625 |
|
|
printk("rs_interrupt_single(%d)...", irq);
|
| 626 |
|
|
#endif
|
| 627 |
|
|
info = (struct esp_struct *)dev_id;
|
| 628 |
|
|
err_status = 0;
|
| 629 |
|
|
scratch = serial_in(info, UART_ESI_SID);
|
| 630 |
|
|
|
| 631 |
|
|
spin_lock(&info->lock);
|
| 632 |
|
|
|
| 633 |
|
|
if (!info->tty) {
|
| 634 |
|
|
spin_unlock(&info->lock);
|
| 635 |
|
|
return IRQ_NONE;
|
| 636 |
|
|
}
|
| 637 |
|
|
|
| 638 |
|
|
if (scratch & 0x04) { /* error */
|
| 639 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_GET_ERR_STAT);
|
| 640 |
|
|
err_status = serial_in(info, UART_ESI_STAT1);
|
| 641 |
|
|
serial_in(info, UART_ESI_STAT2);
|
| 642 |
|
|
|
| 643 |
|
|
if (err_status & 0x01)
|
| 644 |
|
|
info->stat_flags |= ESP_STAT_RX_TIMEOUT;
|
| 645 |
|
|
|
| 646 |
|
|
if (err_status & 0x20) /* UART status */
|
| 647 |
|
|
check_modem_status(info);
|
| 648 |
|
|
|
| 649 |
|
|
if (err_status & 0x80) /* Start break */
|
| 650 |
|
|
wake_up_interruptible(&info->break_wait);
|
| 651 |
|
|
}
|
| 652 |
|
|
|
| 653 |
|
|
if ((scratch & 0x88) || /* DMA completed or timed out */
|
| 654 |
|
|
(err_status & 0x1c) /* receive error */) {
|
| 655 |
|
|
if (info->stat_flags & ESP_STAT_DMA_RX)
|
| 656 |
|
|
receive_chars_dma_done(info, err_status);
|
| 657 |
|
|
else if (info->stat_flags & ESP_STAT_DMA_TX)
|
| 658 |
|
|
transmit_chars_dma_done(info);
|
| 659 |
|
|
}
|
| 660 |
|
|
|
| 661 |
|
|
if (!(info->stat_flags & (ESP_STAT_DMA_RX | ESP_STAT_DMA_TX)) &&
|
| 662 |
|
|
((scratch & 0x01) || (info->stat_flags & ESP_STAT_RX_TIMEOUT)) &&
|
| 663 |
|
|
(info->IER & UART_IER_RDI)) {
|
| 664 |
|
|
int num_bytes;
|
| 665 |
|
|
|
| 666 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
|
| 667 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_GET_RX_AVAIL);
|
| 668 |
|
|
num_bytes = serial_in(info, UART_ESI_STAT1) << 8;
|
| 669 |
|
|
num_bytes |= serial_in(info, UART_ESI_STAT2);
|
| 670 |
|
|
|
| 671 |
|
|
num_bytes = tty_buffer_request_room(info->tty, num_bytes);
|
| 672 |
|
|
|
| 673 |
|
|
if (num_bytes) {
|
| 674 |
|
|
if (dma_bytes ||
|
| 675 |
|
|
(info->stat_flags & ESP_STAT_USE_PIO) ||
|
| 676 |
|
|
(num_bytes <= info->config.pio_threshold))
|
| 677 |
|
|
receive_chars_pio(info, num_bytes);
|
| 678 |
|
|
else
|
| 679 |
|
|
receive_chars_dma(info, num_bytes);
|
| 680 |
|
|
}
|
| 681 |
|
|
}
|
| 682 |
|
|
|
| 683 |
|
|
if (!(info->stat_flags & (ESP_STAT_DMA_RX | ESP_STAT_DMA_TX)) &&
|
| 684 |
|
|
(scratch & 0x02) && (info->IER & UART_IER_THRI)) {
|
| 685 |
|
|
if ((info->xmit_cnt <= 0) || info->tty->stopped) {
|
| 686 |
|
|
info->IER &= ~UART_IER_THRI;
|
| 687 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
|
| 688 |
|
|
serial_out(info, UART_ESI_CMD2, info->IER);
|
| 689 |
|
|
} else {
|
| 690 |
|
|
int num_bytes;
|
| 691 |
|
|
|
| 692 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
|
| 693 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
|
| 694 |
|
|
num_bytes = serial_in(info, UART_ESI_STAT1) << 8;
|
| 695 |
|
|
num_bytes |= serial_in(info, UART_ESI_STAT2);
|
| 696 |
|
|
|
| 697 |
|
|
if (num_bytes > info->xmit_cnt)
|
| 698 |
|
|
num_bytes = info->xmit_cnt;
|
| 699 |
|
|
|
| 700 |
|
|
if (num_bytes) {
|
| 701 |
|
|
if (dma_bytes ||
|
| 702 |
|
|
(info->stat_flags & ESP_STAT_USE_PIO) ||
|
| 703 |
|
|
(num_bytes <= info->config.pio_threshold))
|
| 704 |
|
|
transmit_chars_pio(info, num_bytes);
|
| 705 |
|
|
else
|
| 706 |
|
|
transmit_chars_dma(info, num_bytes);
|
| 707 |
|
|
}
|
| 708 |
|
|
}
|
| 709 |
|
|
}
|
| 710 |
|
|
|
| 711 |
|
|
info->last_active = jiffies;
|
| 712 |
|
|
|
| 713 |
|
|
#ifdef SERIAL_DEBUG_INTR
|
| 714 |
|
|
printk("end.\n");
|
| 715 |
|
|
#endif
|
| 716 |
|
|
spin_unlock(&info->lock);
|
| 717 |
|
|
return IRQ_HANDLED;
|
| 718 |
|
|
}
|
| 719 |
|
|
|
| 720 |
|
|
/*
|
| 721 |
|
|
* -------------------------------------------------------------------
|
| 722 |
|
|
* Here ends the serial interrupt routines.
|
| 723 |
|
|
* -------------------------------------------------------------------
|
| 724 |
|
|
*/
|
| 725 |
|
|
|
| 726 |
|
|
static void do_softint(struct work_struct *work)
|
| 727 |
|
|
{
|
| 728 |
|
|
struct esp_struct *info =
|
| 729 |
|
|
container_of(work, struct esp_struct, tqueue);
|
| 730 |
|
|
struct tty_struct *tty;
|
| 731 |
|
|
|
| 732 |
|
|
tty = info->tty;
|
| 733 |
|
|
if (!tty)
|
| 734 |
|
|
return;
|
| 735 |
|
|
|
| 736 |
|
|
if (test_and_clear_bit(ESP_EVENT_WRITE_WAKEUP, &info->event)) {
|
| 737 |
|
|
tty_wakeup(tty);
|
| 738 |
|
|
}
|
| 739 |
|
|
}
|
| 740 |
|
|
|
| 741 |
|
|
/*
|
| 742 |
|
|
* This routine is called from the scheduler tqueue when the interrupt
|
| 743 |
|
|
* routine has signalled that a hangup has occurred. The path of
|
| 744 |
|
|
* hangup processing is:
|
| 745 |
|
|
*
|
| 746 |
|
|
* serial interrupt routine -> (scheduler tqueue) ->
|
| 747 |
|
|
* do_serial_hangup() -> tty->hangup() -> esp_hangup()
|
| 748 |
|
|
*
|
| 749 |
|
|
*/
|
| 750 |
|
|
static void do_serial_hangup(struct work_struct *work)
|
| 751 |
|
|
{
|
| 752 |
|
|
struct esp_struct *info =
|
| 753 |
|
|
container_of(work, struct esp_struct, tqueue_hangup);
|
| 754 |
|
|
struct tty_struct *tty;
|
| 755 |
|
|
|
| 756 |
|
|
tty = info->tty;
|
| 757 |
|
|
if (tty)
|
| 758 |
|
|
tty_hangup(tty);
|
| 759 |
|
|
}
|
| 760 |
|
|
|
| 761 |
|
|
/*
|
| 762 |
|
|
* ---------------------------------------------------------------
|
| 763 |
|
|
* Low level utility subroutines for the serial driver: routines to
|
| 764 |
|
|
* figure out the appropriate timeout for an interrupt chain, routines
|
| 765 |
|
|
* to initialize and startup a serial port, and routines to shutdown a
|
| 766 |
|
|
* serial port. Useful stuff like that.
|
| 767 |
|
|
*
|
| 768 |
|
|
* Caller should hold lock
|
| 769 |
|
|
* ---------------------------------------------------------------
|
| 770 |
|
|
*/
|
| 771 |
|
|
|
| 772 |
|
|
static inline void esp_basic_init(struct esp_struct * info)
|
| 773 |
|
|
{
|
| 774 |
|
|
/* put ESPC in enhanced mode */
|
| 775 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_MODE);
|
| 776 |
|
|
|
| 777 |
|
|
if (info->stat_flags & ESP_STAT_NEVER_DMA)
|
| 778 |
|
|
serial_out(info, UART_ESI_CMD2, 0x01);
|
| 779 |
|
|
else
|
| 780 |
|
|
serial_out(info, UART_ESI_CMD2, 0x31);
|
| 781 |
|
|
|
| 782 |
|
|
/* disable interrupts for now */
|
| 783 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
|
| 784 |
|
|
serial_out(info, UART_ESI_CMD2, 0x00);
|
| 785 |
|
|
|
| 786 |
|
|
/* set interrupt and DMA channel */
|
| 787 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_IRQ);
|
| 788 |
|
|
|
| 789 |
|
|
if (info->stat_flags & ESP_STAT_NEVER_DMA)
|
| 790 |
|
|
serial_out(info, UART_ESI_CMD2, 0x01);
|
| 791 |
|
|
else
|
| 792 |
|
|
serial_out(info, UART_ESI_CMD2, (dma << 4) | 0x01);
|
| 793 |
|
|
|
| 794 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_ENH_IRQ);
|
| 795 |
|
|
|
| 796 |
|
|
if (info->line % 8) /* secondary port */
|
| 797 |
|
|
serial_out(info, UART_ESI_CMD2, 0x0d); /* shared */
|
| 798 |
|
|
else if (info->irq == 9)
|
| 799 |
|
|
serial_out(info, UART_ESI_CMD2, 0x02);
|
| 800 |
|
|
else
|
| 801 |
|
|
serial_out(info, UART_ESI_CMD2, info->irq);
|
| 802 |
|
|
|
| 803 |
|
|
/* set error status mask (check this) */
|
| 804 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_ERR_MASK);
|
| 805 |
|
|
|
| 806 |
|
|
if (info->stat_flags & ESP_STAT_NEVER_DMA)
|
| 807 |
|
|
serial_out(info, UART_ESI_CMD2, 0xa1);
|
| 808 |
|
|
else
|
| 809 |
|
|
serial_out(info, UART_ESI_CMD2, 0xbd);
|
| 810 |
|
|
|
| 811 |
|
|
serial_out(info, UART_ESI_CMD2, 0x00);
|
| 812 |
|
|
|
| 813 |
|
|
/* set DMA timeout */
|
| 814 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_DMA_TMOUT);
|
| 815 |
|
|
serial_out(info, UART_ESI_CMD2, 0xff);
|
| 816 |
|
|
|
| 817 |
|
|
/* set FIFO trigger levels */
|
| 818 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_TRIGGER);
|
| 819 |
|
|
serial_out(info, UART_ESI_CMD2, info->config.rx_trigger >> 8);
|
| 820 |
|
|
serial_out(info, UART_ESI_CMD2, info->config.rx_trigger);
|
| 821 |
|
|
serial_out(info, UART_ESI_CMD2, info->config.tx_trigger >> 8);
|
| 822 |
|
|
serial_out(info, UART_ESI_CMD2, info->config.tx_trigger);
|
| 823 |
|
|
|
| 824 |
|
|
/* Set clock scaling and wait states */
|
| 825 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_PRESCALAR);
|
| 826 |
|
|
serial_out(info, UART_ESI_CMD2, 0x04 | ESPC_SCALE);
|
| 827 |
|
|
|
| 828 |
|
|
/* set reinterrupt pacing */
|
| 829 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_REINTR);
|
| 830 |
|
|
serial_out(info, UART_ESI_CMD2, 0xff);
|
| 831 |
|
|
}
|
| 832 |
|
|
|
| 833 |
|
|
static int startup(struct esp_struct * info)
|
| 834 |
|
|
{
|
| 835 |
|
|
unsigned long flags;
|
| 836 |
|
|
int retval=0;
|
| 837 |
|
|
unsigned int num_chars;
|
| 838 |
|
|
|
| 839 |
|
|
spin_lock_irqsave(&info->lock, flags);
|
| 840 |
|
|
|
| 841 |
|
|
if (info->flags & ASYNC_INITIALIZED)
|
| 842 |
|
|
goto out;
|
| 843 |
|
|
|
| 844 |
|
|
if (!info->xmit_buf) {
|
| 845 |
|
|
info->xmit_buf = (unsigned char *)get_zeroed_page(GFP_ATOMIC);
|
| 846 |
|
|
retval = -ENOMEM;
|
| 847 |
|
|
if (!info->xmit_buf)
|
| 848 |
|
|
goto out;
|
| 849 |
|
|
}
|
| 850 |
|
|
|
| 851 |
|
|
#ifdef SERIAL_DEBUG_OPEN
|
| 852 |
|
|
printk("starting up ttys%d (irq %d)...", info->line, info->irq);
|
| 853 |
|
|
#endif
|
| 854 |
|
|
|
| 855 |
|
|
/* Flush the RX buffer. Using the ESI flush command may cause */
|
| 856 |
|
|
/* wild interrupts, so read all the data instead. */
|
| 857 |
|
|
|
| 858 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
|
| 859 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_GET_RX_AVAIL);
|
| 860 |
|
|
num_chars = serial_in(info, UART_ESI_STAT1) << 8;
|
| 861 |
|
|
num_chars |= serial_in(info, UART_ESI_STAT2);
|
| 862 |
|
|
|
| 863 |
|
|
while (num_chars > 1) {
|
| 864 |
|
|
inw(info->port + UART_ESI_RX);
|
| 865 |
|
|
num_chars -= 2;
|
| 866 |
|
|
}
|
| 867 |
|
|
|
| 868 |
|
|
if (num_chars)
|
| 869 |
|
|
serial_in(info, UART_ESI_RX);
|
| 870 |
|
|
|
| 871 |
|
|
/* set receive character timeout */
|
| 872 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
|
| 873 |
|
|
serial_out(info, UART_ESI_CMD2, info->config.rx_timeout);
|
| 874 |
|
|
|
| 875 |
|
|
/* clear all flags except the "never DMA" flag */
|
| 876 |
|
|
info->stat_flags &= ESP_STAT_NEVER_DMA;
|
| 877 |
|
|
|
| 878 |
|
|
if (info->stat_flags & ESP_STAT_NEVER_DMA)
|
| 879 |
|
|
info->stat_flags |= ESP_STAT_USE_PIO;
|
| 880 |
|
|
|
| 881 |
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
| 882 |
|
|
|
| 883 |
|
|
/*
|
| 884 |
|
|
* Allocate the IRQ
|
| 885 |
|
|
*/
|
| 886 |
|
|
|
| 887 |
|
|
retval = request_irq(info->irq, rs_interrupt_single, IRQF_SHARED,
|
| 888 |
|
|
"esp serial", info);
|
| 889 |
|
|
|
| 890 |
|
|
if (retval) {
|
| 891 |
|
|
if (capable(CAP_SYS_ADMIN)) {
|
| 892 |
|
|
if (info->tty)
|
| 893 |
|
|
set_bit(TTY_IO_ERROR,
|
| 894 |
|
|
&info->tty->flags);
|
| 895 |
|
|
retval = 0;
|
| 896 |
|
|
}
|
| 897 |
|
|
goto out_unlocked;
|
| 898 |
|
|
}
|
| 899 |
|
|
|
| 900 |
|
|
if (!(info->stat_flags & ESP_STAT_USE_PIO) && !dma_buffer) {
|
| 901 |
|
|
dma_buffer = (char *)__get_dma_pages(
|
| 902 |
|
|
GFP_KERNEL, get_order(DMA_BUFFER_SZ));
|
| 903 |
|
|
|
| 904 |
|
|
/* use PIO mode if DMA buf/chan cannot be allocated */
|
| 905 |
|
|
if (!dma_buffer)
|
| 906 |
|
|
info->stat_flags |= ESP_STAT_USE_PIO;
|
| 907 |
|
|
else if (request_dma(dma, "esp serial")) {
|
| 908 |
|
|
free_pages((unsigned long)dma_buffer,
|
| 909 |
|
|
get_order(DMA_BUFFER_SZ));
|
| 910 |
|
|
dma_buffer = NULL;
|
| 911 |
|
|
info->stat_flags |= ESP_STAT_USE_PIO;
|
| 912 |
|
|
}
|
| 913 |
|
|
|
| 914 |
|
|
}
|
| 915 |
|
|
|
| 916 |
|
|
info->MCR = UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2;
|
| 917 |
|
|
|
| 918 |
|
|
spin_lock_irqsave(&info->lock, flags);
|
| 919 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
|
| 920 |
|
|
serial_out(info, UART_ESI_CMD2, UART_MCR);
|
| 921 |
|
|
serial_out(info, UART_ESI_CMD2, info->MCR);
|
| 922 |
|
|
|
| 923 |
|
|
/*
|
| 924 |
|
|
* Finally, enable interrupts
|
| 925 |
|
|
*/
|
| 926 |
|
|
/* info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI; */
|
| 927 |
|
|
info->IER = UART_IER_RLSI | UART_IER_RDI | UART_IER_DMA_TMOUT |
|
| 928 |
|
|
UART_IER_DMA_TC;
|
| 929 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
|
| 930 |
|
|
serial_out(info, UART_ESI_CMD2, info->IER);
|
| 931 |
|
|
|
| 932 |
|
|
if (info->tty)
|
| 933 |
|
|
clear_bit(TTY_IO_ERROR, &info->tty->flags);
|
| 934 |
|
|
info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
|
| 935 |
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
| 936 |
|
|
|
| 937 |
|
|
/*
|
| 938 |
|
|
* Set up the tty->alt_speed kludge
|
| 939 |
|
|
*/
|
| 940 |
|
|
if (info->tty) {
|
| 941 |
|
|
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
|
| 942 |
|
|
info->tty->alt_speed = 57600;
|
| 943 |
|
|
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
|
| 944 |
|
|
info->tty->alt_speed = 115200;
|
| 945 |
|
|
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
|
| 946 |
|
|
info->tty->alt_speed = 230400;
|
| 947 |
|
|
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
|
| 948 |
|
|
info->tty->alt_speed = 460800;
|
| 949 |
|
|
}
|
| 950 |
|
|
|
| 951 |
|
|
/*
|
| 952 |
|
|
* set the speed of the serial port
|
| 953 |
|
|
*/
|
| 954 |
|
|
change_speed(info);
|
| 955 |
|
|
info->flags |= ASYNC_INITIALIZED;
|
| 956 |
|
|
return 0;
|
| 957 |
|
|
|
| 958 |
|
|
out:
|
| 959 |
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
| 960 |
|
|
out_unlocked:
|
| 961 |
|
|
return retval;
|
| 962 |
|
|
}
|
| 963 |
|
|
|
| 964 |
|
|
/*
|
| 965 |
|
|
* This routine will shutdown a serial port; interrupts are disabled, and
|
| 966 |
|
|
* DTR is dropped if the hangup on close termio flag is on.
|
| 967 |
|
|
*/
|
| 968 |
|
|
static void shutdown(struct esp_struct * info)
|
| 969 |
|
|
{
|
| 970 |
|
|
unsigned long flags, f;
|
| 971 |
|
|
|
| 972 |
|
|
if (!(info->flags & ASYNC_INITIALIZED))
|
| 973 |
|
|
return;
|
| 974 |
|
|
|
| 975 |
|
|
#ifdef SERIAL_DEBUG_OPEN
|
| 976 |
|
|
printk("Shutting down serial port %d (irq %d)....", info->line,
|
| 977 |
|
|
info->irq);
|
| 978 |
|
|
#endif
|
| 979 |
|
|
|
| 980 |
|
|
spin_lock_irqsave(&info->lock, flags);
|
| 981 |
|
|
/*
|
| 982 |
|
|
* clear delta_msr_wait queue to avoid mem leaks: we may free the irq
|
| 983 |
|
|
* here so the queue might never be waken up
|
| 984 |
|
|
*/
|
| 985 |
|
|
wake_up_interruptible(&info->delta_msr_wait);
|
| 986 |
|
|
wake_up_interruptible(&info->break_wait);
|
| 987 |
|
|
|
| 988 |
|
|
/* stop a DMA transfer on the port being closed */
|
| 989 |
|
|
/* DMA lock is higher priority always */
|
| 990 |
|
|
if (info->stat_flags & (ESP_STAT_DMA_RX | ESP_STAT_DMA_TX)) {
|
| 991 |
|
|
f=claim_dma_lock();
|
| 992 |
|
|
disable_dma(dma);
|
| 993 |
|
|
clear_dma_ff(dma);
|
| 994 |
|
|
release_dma_lock(f);
|
| 995 |
|
|
|
| 996 |
|
|
dma_bytes = 0;
|
| 997 |
|
|
}
|
| 998 |
|
|
|
| 999 |
|
|
/*
|
| 1000 |
|
|
* Free the IRQ
|
| 1001 |
|
|
*/
|
| 1002 |
|
|
free_irq(info->irq, info);
|
| 1003 |
|
|
|
| 1004 |
|
|
if (dma_buffer) {
|
| 1005 |
|
|
struct esp_struct *current_port = ports;
|
| 1006 |
|
|
|
| 1007 |
|
|
while (current_port) {
|
| 1008 |
|
|
if ((current_port != info) &&
|
| 1009 |
|
|
(current_port->flags & ASYNC_INITIALIZED))
|
| 1010 |
|
|
break;
|
| 1011 |
|
|
|
| 1012 |
|
|
current_port = current_port->next_port;
|
| 1013 |
|
|
}
|
| 1014 |
|
|
|
| 1015 |
|
|
if (!current_port) {
|
| 1016 |
|
|
free_dma(dma);
|
| 1017 |
|
|
free_pages((unsigned long)dma_buffer,
|
| 1018 |
|
|
get_order(DMA_BUFFER_SZ));
|
| 1019 |
|
|
dma_buffer = NULL;
|
| 1020 |
|
|
}
|
| 1021 |
|
|
}
|
| 1022 |
|
|
|
| 1023 |
|
|
if (info->xmit_buf) {
|
| 1024 |
|
|
free_page((unsigned long) info->xmit_buf);
|
| 1025 |
|
|
info->xmit_buf = NULL;
|
| 1026 |
|
|
}
|
| 1027 |
|
|
|
| 1028 |
|
|
info->IER = 0;
|
| 1029 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
|
| 1030 |
|
|
serial_out(info, UART_ESI_CMD2, 0x00);
|
| 1031 |
|
|
|
| 1032 |
|
|
if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
|
| 1033 |
|
|
info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS);
|
| 1034 |
|
|
|
| 1035 |
|
|
info->MCR &= ~UART_MCR_OUT2;
|
| 1036 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
|
| 1037 |
|
|
serial_out(info, UART_ESI_CMD2, UART_MCR);
|
| 1038 |
|
|
serial_out(info, UART_ESI_CMD2, info->MCR);
|
| 1039 |
|
|
|
| 1040 |
|
|
if (info->tty)
|
| 1041 |
|
|
set_bit(TTY_IO_ERROR, &info->tty->flags);
|
| 1042 |
|
|
|
| 1043 |
|
|
info->flags &= ~ASYNC_INITIALIZED;
|
| 1044 |
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
| 1045 |
|
|
}
|
| 1046 |
|
|
|
| 1047 |
|
|
/*
|
| 1048 |
|
|
* This routine is called to set the UART divisor registers to match
|
| 1049 |
|
|
* the specified baud rate for a serial port.
|
| 1050 |
|
|
*/
|
| 1051 |
|
|
static void change_speed(struct esp_struct *info)
|
| 1052 |
|
|
{
|
| 1053 |
|
|
unsigned short port;
|
| 1054 |
|
|
int quot = 0;
|
| 1055 |
|
|
unsigned cflag,cval;
|
| 1056 |
|
|
int baud, bits;
|
| 1057 |
|
|
unsigned char flow1 = 0, flow2 = 0;
|
| 1058 |
|
|
unsigned long flags;
|
| 1059 |
|
|
|
| 1060 |
|
|
if (!info->tty || !info->tty->termios)
|
| 1061 |
|
|
return;
|
| 1062 |
|
|
cflag = info->tty->termios->c_cflag;
|
| 1063 |
|
|
port = info->port;
|
| 1064 |
|
|
|
| 1065 |
|
|
/* byte size and parity */
|
| 1066 |
|
|
switch (cflag & CSIZE) {
|
| 1067 |
|
|
case CS5: cval = 0x00; bits = 7; break;
|
| 1068 |
|
|
case CS6: cval = 0x01; bits = 8; break;
|
| 1069 |
|
|
case CS7: cval = 0x02; bits = 9; break;
|
| 1070 |
|
|
case CS8: cval = 0x03; bits = 10; break;
|
| 1071 |
|
|
default: cval = 0x00; bits = 7; break;
|
| 1072 |
|
|
}
|
| 1073 |
|
|
if (cflag & CSTOPB) {
|
| 1074 |
|
|
cval |= 0x04;
|
| 1075 |
|
|
bits++;
|
| 1076 |
|
|
}
|
| 1077 |
|
|
if (cflag & PARENB) {
|
| 1078 |
|
|
cval |= UART_LCR_PARITY;
|
| 1079 |
|
|
bits++;
|
| 1080 |
|
|
}
|
| 1081 |
|
|
if (!(cflag & PARODD))
|
| 1082 |
|
|
cval |= UART_LCR_EPAR;
|
| 1083 |
|
|
#ifdef CMSPAR
|
| 1084 |
|
|
if (cflag & CMSPAR)
|
| 1085 |
|
|
cval |= UART_LCR_SPAR;
|
| 1086 |
|
|
#endif
|
| 1087 |
|
|
|
| 1088 |
|
|
baud = tty_get_baud_rate(info->tty);
|
| 1089 |
|
|
if (baud == 38400 &&
|
| 1090 |
|
|
((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
|
| 1091 |
|
|
quot = info->custom_divisor;
|
| 1092 |
|
|
else {
|
| 1093 |
|
|
if (baud == 134)
|
| 1094 |
|
|
/* Special case since 134 is really 134.5 */
|
| 1095 |
|
|
quot = (2*BASE_BAUD / 269);
|
| 1096 |
|
|
else if (baud)
|
| 1097 |
|
|
quot = BASE_BAUD / baud;
|
| 1098 |
|
|
}
|
| 1099 |
|
|
/* If the quotient is ever zero, default to 9600 bps */
|
| 1100 |
|
|
if (!quot)
|
| 1101 |
|
|
quot = BASE_BAUD / 9600;
|
| 1102 |
|
|
|
| 1103 |
|
|
info->timeout = ((1024 * HZ * bits * quot) / BASE_BAUD) + (HZ / 50);
|
| 1104 |
|
|
|
| 1105 |
|
|
/* CTS flow control flag and modem status interrupts */
|
| 1106 |
|
|
/* info->IER &= ~UART_IER_MSI; */
|
| 1107 |
|
|
if (cflag & CRTSCTS) {
|
| 1108 |
|
|
info->flags |= ASYNC_CTS_FLOW;
|
| 1109 |
|
|
/* info->IER |= UART_IER_MSI; */
|
| 1110 |
|
|
flow1 = 0x04;
|
| 1111 |
|
|
flow2 = 0x10;
|
| 1112 |
|
|
} else
|
| 1113 |
|
|
info->flags &= ~ASYNC_CTS_FLOW;
|
| 1114 |
|
|
if (cflag & CLOCAL)
|
| 1115 |
|
|
info->flags &= ~ASYNC_CHECK_CD;
|
| 1116 |
|
|
else {
|
| 1117 |
|
|
info->flags |= ASYNC_CHECK_CD;
|
| 1118 |
|
|
/* info->IER |= UART_IER_MSI; */
|
| 1119 |
|
|
}
|
| 1120 |
|
|
|
| 1121 |
|
|
/*
|
| 1122 |
|
|
* Set up parity check flag
|
| 1123 |
|
|
*/
|
| 1124 |
|
|
info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
|
| 1125 |
|
|
if (I_INPCK(info->tty))
|
| 1126 |
|
|
info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
|
| 1127 |
|
|
if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
|
| 1128 |
|
|
info->read_status_mask |= UART_LSR_BI;
|
| 1129 |
|
|
|
| 1130 |
|
|
info->ignore_status_mask = 0;
|
| 1131 |
|
|
#if 0
|
| 1132 |
|
|
/* This should be safe, but for some broken bits of hardware... */
|
| 1133 |
|
|
if (I_IGNPAR(info->tty)) {
|
| 1134 |
|
|
info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
|
| 1135 |
|
|
info->read_status_mask |= UART_LSR_PE | UART_LSR_FE;
|
| 1136 |
|
|
}
|
| 1137 |
|
|
#endif
|
| 1138 |
|
|
if (I_IGNBRK(info->tty)) {
|
| 1139 |
|
|
info->ignore_status_mask |= UART_LSR_BI;
|
| 1140 |
|
|
info->read_status_mask |= UART_LSR_BI;
|
| 1141 |
|
|
/*
|
| 1142 |
|
|
* If we're ignore parity and break indicators, ignore
|
| 1143 |
|
|
* overruns too. (For real raw support).
|
| 1144 |
|
|
*/
|
| 1145 |
|
|
if (I_IGNPAR(info->tty)) {
|
| 1146 |
|
|
info->ignore_status_mask |= UART_LSR_OE | \
|
| 1147 |
|
|
UART_LSR_PE | UART_LSR_FE;
|
| 1148 |
|
|
info->read_status_mask |= UART_LSR_OE | \
|
| 1149 |
|
|
UART_LSR_PE | UART_LSR_FE;
|
| 1150 |
|
|
}
|
| 1151 |
|
|
}
|
| 1152 |
|
|
|
| 1153 |
|
|
if (I_IXOFF(info->tty))
|
| 1154 |
|
|
flow1 |= 0x81;
|
| 1155 |
|
|
|
| 1156 |
|
|
spin_lock_irqsave(&info->lock, flags);
|
| 1157 |
|
|
/* set baud */
|
| 1158 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_BAUD);
|
| 1159 |
|
|
serial_out(info, UART_ESI_CMD2, quot >> 8);
|
| 1160 |
|
|
serial_out(info, UART_ESI_CMD2, quot & 0xff);
|
| 1161 |
|
|
|
| 1162 |
|
|
/* set data bits, parity, etc. */
|
| 1163 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
|
| 1164 |
|
|
serial_out(info, UART_ESI_CMD2, UART_LCR);
|
| 1165 |
|
|
serial_out(info, UART_ESI_CMD2, cval);
|
| 1166 |
|
|
|
| 1167 |
|
|
/* Enable flow control */
|
| 1168 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_CNTL);
|
| 1169 |
|
|
serial_out(info, UART_ESI_CMD2, flow1);
|
| 1170 |
|
|
serial_out(info, UART_ESI_CMD2, flow2);
|
| 1171 |
|
|
|
| 1172 |
|
|
/* set flow control characters (XON/XOFF only) */
|
| 1173 |
|
|
if (I_IXOFF(info->tty)) {
|
| 1174 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_CHARS);
|
| 1175 |
|
|
serial_out(info, UART_ESI_CMD2, START_CHAR(info->tty));
|
| 1176 |
|
|
serial_out(info, UART_ESI_CMD2, STOP_CHAR(info->tty));
|
| 1177 |
|
|
serial_out(info, UART_ESI_CMD2, 0x10);
|
| 1178 |
|
|
serial_out(info, UART_ESI_CMD2, 0x21);
|
| 1179 |
|
|
switch (cflag & CSIZE) {
|
| 1180 |
|
|
case CS5:
|
| 1181 |
|
|
serial_out(info, UART_ESI_CMD2, 0x1f);
|
| 1182 |
|
|
break;
|
| 1183 |
|
|
case CS6:
|
| 1184 |
|
|
serial_out(info, UART_ESI_CMD2, 0x3f);
|
| 1185 |
|
|
break;
|
| 1186 |
|
|
case CS7:
|
| 1187 |
|
|
case CS8:
|
| 1188 |
|
|
serial_out(info, UART_ESI_CMD2, 0x7f);
|
| 1189 |
|
|
break;
|
| 1190 |
|
|
default:
|
| 1191 |
|
|
serial_out(info, UART_ESI_CMD2, 0xff);
|
| 1192 |
|
|
break;
|
| 1193 |
|
|
}
|
| 1194 |
|
|
}
|
| 1195 |
|
|
|
| 1196 |
|
|
/* Set high/low water */
|
| 1197 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_LVL);
|
| 1198 |
|
|
serial_out(info, UART_ESI_CMD2, info->config.flow_off >> 8);
|
| 1199 |
|
|
serial_out(info, UART_ESI_CMD2, info->config.flow_off);
|
| 1200 |
|
|
serial_out(info, UART_ESI_CMD2, info->config.flow_on >> 8);
|
| 1201 |
|
|
serial_out(info, UART_ESI_CMD2, info->config.flow_on);
|
| 1202 |
|
|
|
| 1203 |
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
| 1204 |
|
|
}
|
| 1205 |
|
|
|
| 1206 |
|
|
static void rs_put_char(struct tty_struct *tty, unsigned char ch)
|
| 1207 |
|
|
{
|
| 1208 |
|
|
struct esp_struct *info = (struct esp_struct *)tty->driver_data;
|
| 1209 |
|
|
unsigned long flags;
|
| 1210 |
|
|
|
| 1211 |
|
|
if (serial_paranoia_check(info, tty->name, "rs_put_char"))
|
| 1212 |
|
|
return;
|
| 1213 |
|
|
|
| 1214 |
|
|
if (!info->xmit_buf)
|
| 1215 |
|
|
return;
|
| 1216 |
|
|
|
| 1217 |
|
|
spin_lock_irqsave(&info->lock, flags);
|
| 1218 |
|
|
if (info->xmit_cnt < ESP_XMIT_SIZE - 1) {
|
| 1219 |
|
|
info->xmit_buf[info->xmit_head++] = ch;
|
| 1220 |
|
|
info->xmit_head &= ESP_XMIT_SIZE-1;
|
| 1221 |
|
|
info->xmit_cnt++;
|
| 1222 |
|
|
}
|
| 1223 |
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
| 1224 |
|
|
}
|
| 1225 |
|
|
|
| 1226 |
|
|
static void rs_flush_chars(struct tty_struct *tty)
|
| 1227 |
|
|
{
|
| 1228 |
|
|
struct esp_struct *info = (struct esp_struct *)tty->driver_data;
|
| 1229 |
|
|
unsigned long flags;
|
| 1230 |
|
|
|
| 1231 |
|
|
if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
|
| 1232 |
|
|
return;
|
| 1233 |
|
|
|
| 1234 |
|
|
spin_lock_irqsave(&info->lock, flags);
|
| 1235 |
|
|
|
| 1236 |
|
|
if (info->xmit_cnt <= 0 || tty->stopped || !info->xmit_buf)
|
| 1237 |
|
|
goto out;
|
| 1238 |
|
|
|
| 1239 |
|
|
if (!(info->IER & UART_IER_THRI)) {
|
| 1240 |
|
|
info->IER |= UART_IER_THRI;
|
| 1241 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
|
| 1242 |
|
|
serial_out(info, UART_ESI_CMD2, info->IER);
|
| 1243 |
|
|
}
|
| 1244 |
|
|
out:
|
| 1245 |
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
| 1246 |
|
|
}
|
| 1247 |
|
|
|
| 1248 |
|
|
static int rs_write(struct tty_struct * tty,
|
| 1249 |
|
|
const unsigned char *buf, int count)
|
| 1250 |
|
|
{
|
| 1251 |
|
|
int c, t, ret = 0;
|
| 1252 |
|
|
struct esp_struct *info = (struct esp_struct *)tty->driver_data;
|
| 1253 |
|
|
unsigned long flags;
|
| 1254 |
|
|
|
| 1255 |
|
|
if (serial_paranoia_check(info, tty->name, "rs_write"))
|
| 1256 |
|
|
return 0;
|
| 1257 |
|
|
|
| 1258 |
|
|
if (!info->xmit_buf)
|
| 1259 |
|
|
return 0;
|
| 1260 |
|
|
|
| 1261 |
|
|
while (1) {
|
| 1262 |
|
|
/* Thanks to R. Wolff for suggesting how to do this with */
|
| 1263 |
|
|
/* interrupts enabled */
|
| 1264 |
|
|
|
| 1265 |
|
|
c = count;
|
| 1266 |
|
|
t = ESP_XMIT_SIZE - info->xmit_cnt - 1;
|
| 1267 |
|
|
|
| 1268 |
|
|
if (t < c)
|
| 1269 |
|
|
c = t;
|
| 1270 |
|
|
|
| 1271 |
|
|
t = ESP_XMIT_SIZE - info->xmit_head;
|
| 1272 |
|
|
|
| 1273 |
|
|
if (t < c)
|
| 1274 |
|
|
c = t;
|
| 1275 |
|
|
|
| 1276 |
|
|
if (c <= 0)
|
| 1277 |
|
|
break;
|
| 1278 |
|
|
|
| 1279 |
|
|
memcpy(info->xmit_buf + info->xmit_head, buf, c);
|
| 1280 |
|
|
|
| 1281 |
|
|
info->xmit_head = (info->xmit_head + c) & (ESP_XMIT_SIZE-1);
|
| 1282 |
|
|
info->xmit_cnt += c;
|
| 1283 |
|
|
buf += c;
|
| 1284 |
|
|
count -= c;
|
| 1285 |
|
|
ret += c;
|
| 1286 |
|
|
}
|
| 1287 |
|
|
|
| 1288 |
|
|
spin_lock_irqsave(&info->lock, flags);
|
| 1289 |
|
|
|
| 1290 |
|
|
if (info->xmit_cnt && !tty->stopped && !(info->IER & UART_IER_THRI)) {
|
| 1291 |
|
|
info->IER |= UART_IER_THRI;
|
| 1292 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
|
| 1293 |
|
|
serial_out(info, UART_ESI_CMD2, info->IER);
|
| 1294 |
|
|
}
|
| 1295 |
|
|
|
| 1296 |
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
| 1297 |
|
|
return ret;
|
| 1298 |
|
|
}
|
| 1299 |
|
|
|
| 1300 |
|
|
static int rs_write_room(struct tty_struct *tty)
|
| 1301 |
|
|
{
|
| 1302 |
|
|
struct esp_struct *info = (struct esp_struct *)tty->driver_data;
|
| 1303 |
|
|
int ret;
|
| 1304 |
|
|
unsigned long flags;
|
| 1305 |
|
|
|
| 1306 |
|
|
if (serial_paranoia_check(info, tty->name, "rs_write_room"))
|
| 1307 |
|
|
return 0;
|
| 1308 |
|
|
|
| 1309 |
|
|
spin_lock_irqsave(&info->lock, flags);
|
| 1310 |
|
|
|
| 1311 |
|
|
ret = ESP_XMIT_SIZE - info->xmit_cnt - 1;
|
| 1312 |
|
|
if (ret < 0)
|
| 1313 |
|
|
ret = 0;
|
| 1314 |
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
| 1315 |
|
|
return ret;
|
| 1316 |
|
|
}
|
| 1317 |
|
|
|
| 1318 |
|
|
static int rs_chars_in_buffer(struct tty_struct *tty)
|
| 1319 |
|
|
{
|
| 1320 |
|
|
struct esp_struct *info = (struct esp_struct *)tty->driver_data;
|
| 1321 |
|
|
|
| 1322 |
|
|
if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
|
| 1323 |
|
|
return 0;
|
| 1324 |
|
|
return info->xmit_cnt;
|
| 1325 |
|
|
}
|
| 1326 |
|
|
|
| 1327 |
|
|
static void rs_flush_buffer(struct tty_struct *tty)
|
| 1328 |
|
|
{
|
| 1329 |
|
|
struct esp_struct *info = (struct esp_struct *)tty->driver_data;
|
| 1330 |
|
|
unsigned long flags;
|
| 1331 |
|
|
|
| 1332 |
|
|
if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
|
| 1333 |
|
|
return;
|
| 1334 |
|
|
spin_lock_irqsave(&info->lock, flags);
|
| 1335 |
|
|
info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
|
| 1336 |
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
| 1337 |
|
|
tty_wakeup(tty);
|
| 1338 |
|
|
}
|
| 1339 |
|
|
|
| 1340 |
|
|
/*
|
| 1341 |
|
|
* ------------------------------------------------------------
|
| 1342 |
|
|
* rs_throttle()
|
| 1343 |
|
|
*
|
| 1344 |
|
|
* This routine is called by the upper-layer tty layer to signal that
|
| 1345 |
|
|
* incoming characters should be throttled.
|
| 1346 |
|
|
* ------------------------------------------------------------
|
| 1347 |
|
|
*/
|
| 1348 |
|
|
static void rs_throttle(struct tty_struct * tty)
|
| 1349 |
|
|
{
|
| 1350 |
|
|
struct esp_struct *info = (struct esp_struct *)tty->driver_data;
|
| 1351 |
|
|
unsigned long flags;
|
| 1352 |
|
|
#ifdef SERIAL_DEBUG_THROTTLE
|
| 1353 |
|
|
char buf[64];
|
| 1354 |
|
|
|
| 1355 |
|
|
printk("throttle %s: %d....\n", tty_name(tty, buf),
|
| 1356 |
|
|
tty->ldisc.chars_in_buffer(tty));
|
| 1357 |
|
|
#endif
|
| 1358 |
|
|
|
| 1359 |
|
|
if (serial_paranoia_check(info, tty->name, "rs_throttle"))
|
| 1360 |
|
|
return;
|
| 1361 |
|
|
|
| 1362 |
|
|
spin_lock_irqsave(&info->lock, flags);
|
| 1363 |
|
|
info->IER &= ~UART_IER_RDI;
|
| 1364 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
|
| 1365 |
|
|
serial_out(info, UART_ESI_CMD2, info->IER);
|
| 1366 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
|
| 1367 |
|
|
serial_out(info, UART_ESI_CMD2, 0x00);
|
| 1368 |
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
| 1369 |
|
|
}
|
| 1370 |
|
|
|
| 1371 |
|
|
static void rs_unthrottle(struct tty_struct * tty)
|
| 1372 |
|
|
{
|
| 1373 |
|
|
struct esp_struct *info = (struct esp_struct *)tty->driver_data;
|
| 1374 |
|
|
unsigned long flags;
|
| 1375 |
|
|
#ifdef SERIAL_DEBUG_THROTTLE
|
| 1376 |
|
|
char buf[64];
|
| 1377 |
|
|
|
| 1378 |
|
|
printk("unthrottle %s: %d....\n", tty_name(tty, buf),
|
| 1379 |
|
|
tty->ldisc.chars_in_buffer(tty));
|
| 1380 |
|
|
#endif
|
| 1381 |
|
|
|
| 1382 |
|
|
if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
|
| 1383 |
|
|
return;
|
| 1384 |
|
|
|
| 1385 |
|
|
spin_lock_irqsave(&info->lock, flags);
|
| 1386 |
|
|
info->IER |= UART_IER_RDI;
|
| 1387 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
|
| 1388 |
|
|
serial_out(info, UART_ESI_CMD2, info->IER);
|
| 1389 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
|
| 1390 |
|
|
serial_out(info, UART_ESI_CMD2, info->config.rx_timeout);
|
| 1391 |
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
| 1392 |
|
|
}
|
| 1393 |
|
|
|
| 1394 |
|
|
/*
|
| 1395 |
|
|
* ------------------------------------------------------------
|
| 1396 |
|
|
* rs_ioctl() and friends
|
| 1397 |
|
|
* ------------------------------------------------------------
|
| 1398 |
|
|
*/
|
| 1399 |
|
|
|
| 1400 |
|
|
static int get_serial_info(struct esp_struct * info,
|
| 1401 |
|
|
struct serial_struct __user *retinfo)
|
| 1402 |
|
|
{
|
| 1403 |
|
|
struct serial_struct tmp;
|
| 1404 |
|
|
|
| 1405 |
|
|
memset(&tmp, 0, sizeof(tmp));
|
| 1406 |
|
|
tmp.type = PORT_16550A;
|
| 1407 |
|
|
tmp.line = info->line;
|
| 1408 |
|
|
tmp.port = info->port;
|
| 1409 |
|
|
tmp.irq = info->irq;
|
| 1410 |
|
|
tmp.flags = info->flags;
|
| 1411 |
|
|
tmp.xmit_fifo_size = 1024;
|
| 1412 |
|
|
tmp.baud_base = BASE_BAUD;
|
| 1413 |
|
|
tmp.close_delay = info->close_delay;
|
| 1414 |
|
|
tmp.closing_wait = info->closing_wait;
|
| 1415 |
|
|
tmp.custom_divisor = info->custom_divisor;
|
| 1416 |
|
|
tmp.hub6 = 0;
|
| 1417 |
|
|
if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
|
| 1418 |
|
|
return -EFAULT;
|
| 1419 |
|
|
return 0;
|
| 1420 |
|
|
}
|
| 1421 |
|
|
|
| 1422 |
|
|
static int get_esp_config(struct esp_struct * info,
|
| 1423 |
|
|
struct hayes_esp_config __user *retinfo)
|
| 1424 |
|
|
{
|
| 1425 |
|
|
struct hayes_esp_config tmp;
|
| 1426 |
|
|
|
| 1427 |
|
|
if (!retinfo)
|
| 1428 |
|
|
return -EFAULT;
|
| 1429 |
|
|
|
| 1430 |
|
|
memset(&tmp, 0, sizeof(tmp));
|
| 1431 |
|
|
tmp.rx_timeout = info->config.rx_timeout;
|
| 1432 |
|
|
tmp.rx_trigger = info->config.rx_trigger;
|
| 1433 |
|
|
tmp.tx_trigger = info->config.tx_trigger;
|
| 1434 |
|
|
tmp.flow_off = info->config.flow_off;
|
| 1435 |
|
|
tmp.flow_on = info->config.flow_on;
|
| 1436 |
|
|
tmp.pio_threshold = info->config.pio_threshold;
|
| 1437 |
|
|
tmp.dma_channel = (info->stat_flags & ESP_STAT_NEVER_DMA ? 0 : dma);
|
| 1438 |
|
|
|
| 1439 |
|
|
return copy_to_user(retinfo, &tmp, sizeof(*retinfo)) ? -EFAULT : 0;
|
| 1440 |
|
|
}
|
| 1441 |
|
|
|
| 1442 |
|
|
static int set_serial_info(struct esp_struct * info,
|
| 1443 |
|
|
struct serial_struct __user *new_info)
|
| 1444 |
|
|
{
|
| 1445 |
|
|
struct serial_struct new_serial;
|
| 1446 |
|
|
struct esp_struct old_info;
|
| 1447 |
|
|
unsigned int change_irq;
|
| 1448 |
|
|
int retval = 0;
|
| 1449 |
|
|
struct esp_struct *current_async;
|
| 1450 |
|
|
|
| 1451 |
|
|
if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
|
| 1452 |
|
|
return -EFAULT;
|
| 1453 |
|
|
old_info = *info;
|
| 1454 |
|
|
|
| 1455 |
|
|
if ((new_serial.type != PORT_16550A) ||
|
| 1456 |
|
|
(new_serial.hub6) ||
|
| 1457 |
|
|
(info->port != new_serial.port) ||
|
| 1458 |
|
|
(new_serial.baud_base != BASE_BAUD) ||
|
| 1459 |
|
|
(new_serial.irq > 15) ||
|
| 1460 |
|
|
(new_serial.irq < 2) ||
|
| 1461 |
|
|
(new_serial.irq == 6) ||
|
| 1462 |
|
|
(new_serial.irq == 8) ||
|
| 1463 |
|
|
(new_serial.irq == 13))
|
| 1464 |
|
|
return -EINVAL;
|
| 1465 |
|
|
|
| 1466 |
|
|
change_irq = new_serial.irq != info->irq;
|
| 1467 |
|
|
|
| 1468 |
|
|
if (change_irq && (info->line % 8))
|
| 1469 |
|
|
return -EINVAL;
|
| 1470 |
|
|
|
| 1471 |
|
|
if (!capable(CAP_SYS_ADMIN)) {
|
| 1472 |
|
|
if (change_irq ||
|
| 1473 |
|
|
(new_serial.close_delay != info->close_delay) ||
|
| 1474 |
|
|
((new_serial.flags & ~ASYNC_USR_MASK) !=
|
| 1475 |
|
|
(info->flags & ~ASYNC_USR_MASK)))
|
| 1476 |
|
|
return -EPERM;
|
| 1477 |
|
|
info->flags = ((info->flags & ~ASYNC_USR_MASK) |
|
| 1478 |
|
|
(new_serial.flags & ASYNC_USR_MASK));
|
| 1479 |
|
|
info->custom_divisor = new_serial.custom_divisor;
|
| 1480 |
|
|
} else {
|
| 1481 |
|
|
if (new_serial.irq == 2)
|
| 1482 |
|
|
new_serial.irq = 9;
|
| 1483 |
|
|
|
| 1484 |
|
|
if (change_irq) {
|
| 1485 |
|
|
current_async = ports;
|
| 1486 |
|
|
|
| 1487 |
|
|
while (current_async) {
|
| 1488 |
|
|
if ((current_async->line >= info->line) &&
|
| 1489 |
|
|
(current_async->line < (info->line + 8))) {
|
| 1490 |
|
|
if (current_async == info) {
|
| 1491 |
|
|
if (current_async->count > 1)
|
| 1492 |
|
|
return -EBUSY;
|
| 1493 |
|
|
} else if (current_async->count)
|
| 1494 |
|
|
return -EBUSY;
|
| 1495 |
|
|
}
|
| 1496 |
|
|
|
| 1497 |
|
|
current_async = current_async->next_port;
|
| 1498 |
|
|
}
|
| 1499 |
|
|
}
|
| 1500 |
|
|
|
| 1501 |
|
|
/*
|
| 1502 |
|
|
* OK, past this point, all the error checking has been done.
|
| 1503 |
|
|
* At this point, we start making changes.....
|
| 1504 |
|
|
*/
|
| 1505 |
|
|
|
| 1506 |
|
|
info->flags = ((info->flags & ~ASYNC_FLAGS) |
|
| 1507 |
|
|
(new_serial.flags & ASYNC_FLAGS));
|
| 1508 |
|
|
info->custom_divisor = new_serial.custom_divisor;
|
| 1509 |
|
|
info->close_delay = new_serial.close_delay * HZ/100;
|
| 1510 |
|
|
info->closing_wait = new_serial.closing_wait * HZ/100;
|
| 1511 |
|
|
|
| 1512 |
|
|
if (change_irq) {
|
| 1513 |
|
|
/*
|
| 1514 |
|
|
* We need to shutdown the serial port at the old
|
| 1515 |
|
|
* port/irq combination.
|
| 1516 |
|
|
*/
|
| 1517 |
|
|
shutdown(info);
|
| 1518 |
|
|
|
| 1519 |
|
|
current_async = ports;
|
| 1520 |
|
|
|
| 1521 |
|
|
while (current_async) {
|
| 1522 |
|
|
if ((current_async->line >= info->line) &&
|
| 1523 |
|
|
(current_async->line < (info->line + 8)))
|
| 1524 |
|
|
current_async->irq = new_serial.irq;
|
| 1525 |
|
|
|
| 1526 |
|
|
current_async = current_async->next_port;
|
| 1527 |
|
|
}
|
| 1528 |
|
|
|
| 1529 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_ENH_IRQ);
|
| 1530 |
|
|
if (info->irq == 9)
|
| 1531 |
|
|
serial_out(info, UART_ESI_CMD2, 0x02);
|
| 1532 |
|
|
else
|
| 1533 |
|
|
serial_out(info, UART_ESI_CMD2, info->irq);
|
| 1534 |
|
|
}
|
| 1535 |
|
|
}
|
| 1536 |
|
|
|
| 1537 |
|
|
if (info->flags & ASYNC_INITIALIZED) {
|
| 1538 |
|
|
if (((old_info.flags & ASYNC_SPD_MASK) !=
|
| 1539 |
|
|
(info->flags & ASYNC_SPD_MASK)) ||
|
| 1540 |
|
|
(old_info.custom_divisor != info->custom_divisor)) {
|
| 1541 |
|
|
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
|
| 1542 |
|
|
info->tty->alt_speed = 57600;
|
| 1543 |
|
|
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
|
| 1544 |
|
|
info->tty->alt_speed = 115200;
|
| 1545 |
|
|
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
|
| 1546 |
|
|
info->tty->alt_speed = 230400;
|
| 1547 |
|
|
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
|
| 1548 |
|
|
info->tty->alt_speed = 460800;
|
| 1549 |
|
|
change_speed(info);
|
| 1550 |
|
|
}
|
| 1551 |
|
|
} else
|
| 1552 |
|
|
retval = startup(info);
|
| 1553 |
|
|
|
| 1554 |
|
|
return retval;
|
| 1555 |
|
|
}
|
| 1556 |
|
|
|
| 1557 |
|
|
static int set_esp_config(struct esp_struct * info,
|
| 1558 |
|
|
struct hayes_esp_config __user * new_info)
|
| 1559 |
|
|
{
|
| 1560 |
|
|
struct hayes_esp_config new_config;
|
| 1561 |
|
|
unsigned int change_dma;
|
| 1562 |
|
|
int retval = 0;
|
| 1563 |
|
|
struct esp_struct *current_async;
|
| 1564 |
|
|
unsigned long flags;
|
| 1565 |
|
|
|
| 1566 |
|
|
/* Perhaps a non-sysadmin user should be able to do some of these */
|
| 1567 |
|
|
/* operations. I haven't decided yet. */
|
| 1568 |
|
|
|
| 1569 |
|
|
if (!capable(CAP_SYS_ADMIN))
|
| 1570 |
|
|
return -EPERM;
|
| 1571 |
|
|
|
| 1572 |
|
|
if (copy_from_user(&new_config, new_info, sizeof(new_config)))
|
| 1573 |
|
|
return -EFAULT;
|
| 1574 |
|
|
|
| 1575 |
|
|
if ((new_config.flow_on >= new_config.flow_off) ||
|
| 1576 |
|
|
(new_config.rx_trigger < 1) ||
|
| 1577 |
|
|
(new_config.tx_trigger < 1) ||
|
| 1578 |
|
|
(new_config.flow_off < 1) ||
|
| 1579 |
|
|
(new_config.flow_on < 1) ||
|
| 1580 |
|
|
(new_config.rx_trigger > 1023) ||
|
| 1581 |
|
|
(new_config.tx_trigger > 1023) ||
|
| 1582 |
|
|
(new_config.flow_off > 1023) ||
|
| 1583 |
|
|
(new_config.flow_on > 1023) ||
|
| 1584 |
|
|
(new_config.pio_threshold < 0) ||
|
| 1585 |
|
|
(new_config.pio_threshold > 1024))
|
| 1586 |
|
|
return -EINVAL;
|
| 1587 |
|
|
|
| 1588 |
|
|
if ((new_config.dma_channel != 1) && (new_config.dma_channel != 3))
|
| 1589 |
|
|
new_config.dma_channel = 0;
|
| 1590 |
|
|
|
| 1591 |
|
|
if (info->stat_flags & ESP_STAT_NEVER_DMA)
|
| 1592 |
|
|
change_dma = new_config.dma_channel;
|
| 1593 |
|
|
else
|
| 1594 |
|
|
change_dma = (new_config.dma_channel != dma);
|
| 1595 |
|
|
|
| 1596 |
|
|
if (change_dma) {
|
| 1597 |
|
|
if (new_config.dma_channel) {
|
| 1598 |
|
|
/* PIO mode to DMA mode transition OR */
|
| 1599 |
|
|
/* change current DMA channel */
|
| 1600 |
|
|
|
| 1601 |
|
|
current_async = ports;
|
| 1602 |
|
|
|
| 1603 |
|
|
while (current_async) {
|
| 1604 |
|
|
if (current_async == info) {
|
| 1605 |
|
|
if (current_async->count > 1)
|
| 1606 |
|
|
return -EBUSY;
|
| 1607 |
|
|
} else if (current_async->count)
|
| 1608 |
|
|
return -EBUSY;
|
| 1609 |
|
|
|
| 1610 |
|
|
current_async =
|
| 1611 |
|
|
current_async->next_port;
|
| 1612 |
|
|
}
|
| 1613 |
|
|
|
| 1614 |
|
|
shutdown(info);
|
| 1615 |
|
|
dma = new_config.dma_channel;
|
| 1616 |
|
|
info->stat_flags &= ~ESP_STAT_NEVER_DMA;
|
| 1617 |
|
|
|
| 1618 |
|
|
/* all ports must use the same DMA channel */
|
| 1619 |
|
|
|
| 1620 |
|
|
spin_lock_irqsave(&info->lock, flags);
|
| 1621 |
|
|
current_async = ports;
|
| 1622 |
|
|
|
| 1623 |
|
|
while (current_async) {
|
| 1624 |
|
|
esp_basic_init(current_async);
|
| 1625 |
|
|
current_async = current_async->next_port;
|
| 1626 |
|
|
}
|
| 1627 |
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
| 1628 |
|
|
} else {
|
| 1629 |
|
|
/* DMA mode to PIO mode only */
|
| 1630 |
|
|
|
| 1631 |
|
|
if (info->count > 1)
|
| 1632 |
|
|
return -EBUSY;
|
| 1633 |
|
|
|
| 1634 |
|
|
shutdown(info);
|
| 1635 |
|
|
spin_lock_irqsave(&info->lock, flags);
|
| 1636 |
|
|
info->stat_flags |= ESP_STAT_NEVER_DMA;
|
| 1637 |
|
|
esp_basic_init(info);
|
| 1638 |
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
| 1639 |
|
|
}
|
| 1640 |
|
|
}
|
| 1641 |
|
|
|
| 1642 |
|
|
info->config.pio_threshold = new_config.pio_threshold;
|
| 1643 |
|
|
|
| 1644 |
|
|
if ((new_config.flow_off != info->config.flow_off) ||
|
| 1645 |
|
|
(new_config.flow_on != info->config.flow_on)) {
|
| 1646 |
|
|
unsigned long flags;
|
| 1647 |
|
|
|
| 1648 |
|
|
info->config.flow_off = new_config.flow_off;
|
| 1649 |
|
|
info->config.flow_on = new_config.flow_on;
|
| 1650 |
|
|
|
| 1651 |
|
|
spin_lock_irqsave(&info->lock, flags);
|
| 1652 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_LVL);
|
| 1653 |
|
|
serial_out(info, UART_ESI_CMD2, new_config.flow_off >> 8);
|
| 1654 |
|
|
serial_out(info, UART_ESI_CMD2, new_config.flow_off);
|
| 1655 |
|
|
serial_out(info, UART_ESI_CMD2, new_config.flow_on >> 8);
|
| 1656 |
|
|
serial_out(info, UART_ESI_CMD2, new_config.flow_on);
|
| 1657 |
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
| 1658 |
|
|
}
|
| 1659 |
|
|
|
| 1660 |
|
|
if ((new_config.rx_trigger != info->config.rx_trigger) ||
|
| 1661 |
|
|
(new_config.tx_trigger != info->config.tx_trigger)) {
|
| 1662 |
|
|
unsigned long flags;
|
| 1663 |
|
|
|
| 1664 |
|
|
info->config.rx_trigger = new_config.rx_trigger;
|
| 1665 |
|
|
info->config.tx_trigger = new_config.tx_trigger;
|
| 1666 |
|
|
spin_lock_irqsave(&info->lock, flags);
|
| 1667 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_TRIGGER);
|
| 1668 |
|
|
serial_out(info, UART_ESI_CMD2,
|
| 1669 |
|
|
new_config.rx_trigger >> 8);
|
| 1670 |
|
|
serial_out(info, UART_ESI_CMD2, new_config.rx_trigger);
|
| 1671 |
|
|
serial_out(info, UART_ESI_CMD2,
|
| 1672 |
|
|
new_config.tx_trigger >> 8);
|
| 1673 |
|
|
serial_out(info, UART_ESI_CMD2, new_config.tx_trigger);
|
| 1674 |
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
| 1675 |
|
|
}
|
| 1676 |
|
|
|
| 1677 |
|
|
if (new_config.rx_timeout != info->config.rx_timeout) {
|
| 1678 |
|
|
unsigned long flags;
|
| 1679 |
|
|
|
| 1680 |
|
|
info->config.rx_timeout = new_config.rx_timeout;
|
| 1681 |
|
|
spin_lock_irqsave(&info->lock, flags);
|
| 1682 |
|
|
|
| 1683 |
|
|
if (info->IER & UART_IER_RDI) {
|
| 1684 |
|
|
serial_out(info, UART_ESI_CMD1,
|
| 1685 |
|
|
ESI_SET_RX_TIMEOUT);
|
| 1686 |
|
|
serial_out(info, UART_ESI_CMD2,
|
| 1687 |
|
|
new_config.rx_timeout);
|
| 1688 |
|
|
}
|
| 1689 |
|
|
|
| 1690 |
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
| 1691 |
|
|
}
|
| 1692 |
|
|
|
| 1693 |
|
|
if (!(info->flags & ASYNC_INITIALIZED))
|
| 1694 |
|
|
retval = startup(info);
|
| 1695 |
|
|
|
| 1696 |
|
|
return retval;
|
| 1697 |
|
|
}
|
| 1698 |
|
|
|
| 1699 |
|
|
/*
|
| 1700 |
|
|
* get_lsr_info - get line status register info
|
| 1701 |
|
|
*
|
| 1702 |
|
|
* Purpose: Let user call ioctl() to get info when the UART physically
|
| 1703 |
|
|
* is emptied. On bus types like RS485, the transmitter must
|
| 1704 |
|
|
* release the bus after transmitting. This must be done when
|
| 1705 |
|
|
* the transmit shift register is empty, not be done when the
|
| 1706 |
|
|
* transmit holding register is empty. This functionality
|
| 1707 |
|
|
* allows an RS485 driver to be written in user space.
|
| 1708 |
|
|
*/
|
| 1709 |
|
|
static int get_lsr_info(struct esp_struct * info, unsigned int __user *value)
|
| 1710 |
|
|
{
|
| 1711 |
|
|
unsigned char status;
|
| 1712 |
|
|
unsigned int result;
|
| 1713 |
|
|
unsigned long flags;
|
| 1714 |
|
|
|
| 1715 |
|
|
spin_lock_irqsave(&info->lock, flags);
|
| 1716 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
|
| 1717 |
|
|
status = serial_in(info, UART_ESI_STAT1);
|
| 1718 |
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
| 1719 |
|
|
result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
|
| 1720 |
|
|
return put_user(result,value);
|
| 1721 |
|
|
}
|
| 1722 |
|
|
|
| 1723 |
|
|
|
| 1724 |
|
|
static int esp_tiocmget(struct tty_struct *tty, struct file *file)
|
| 1725 |
|
|
{
|
| 1726 |
|
|
struct esp_struct * info = (struct esp_struct *)tty->driver_data;
|
| 1727 |
|
|
unsigned char control, status;
|
| 1728 |
|
|
unsigned long flags;
|
| 1729 |
|
|
|
| 1730 |
|
|
if (serial_paranoia_check(info, tty->name, __FUNCTION__))
|
| 1731 |
|
|
return -ENODEV;
|
| 1732 |
|
|
if (tty->flags & (1 << TTY_IO_ERROR))
|
| 1733 |
|
|
return -EIO;
|
| 1734 |
|
|
|
| 1735 |
|
|
control = info->MCR;
|
| 1736 |
|
|
|
| 1737 |
|
|
spin_lock_irqsave(&info->lock, flags);
|
| 1738 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
|
| 1739 |
|
|
status = serial_in(info, UART_ESI_STAT2);
|
| 1740 |
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
| 1741 |
|
|
|
| 1742 |
|
|
return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0)
|
| 1743 |
|
|
| ((control & UART_MCR_DTR) ? TIOCM_DTR : 0)
|
| 1744 |
|
|
| ((status & UART_MSR_DCD) ? TIOCM_CAR : 0)
|
| 1745 |
|
|
| ((status & UART_MSR_RI) ? TIOCM_RNG : 0)
|
| 1746 |
|
|
| ((status & UART_MSR_DSR) ? TIOCM_DSR : 0)
|
| 1747 |
|
|
| ((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
|
| 1748 |
|
|
}
|
| 1749 |
|
|
|
| 1750 |
|
|
static int esp_tiocmset(struct tty_struct *tty, struct file *file,
|
| 1751 |
|
|
unsigned int set, unsigned int clear)
|
| 1752 |
|
|
{
|
| 1753 |
|
|
struct esp_struct * info = (struct esp_struct *)tty->driver_data;
|
| 1754 |
|
|
unsigned long flags;
|
| 1755 |
|
|
|
| 1756 |
|
|
if (serial_paranoia_check(info, tty->name, __FUNCTION__))
|
| 1757 |
|
|
return -ENODEV;
|
| 1758 |
|
|
if (tty->flags & (1 << TTY_IO_ERROR))
|
| 1759 |
|
|
return -EIO;
|
| 1760 |
|
|
|
| 1761 |
|
|
spin_lock_irqsave(&info->lock, flags);
|
| 1762 |
|
|
|
| 1763 |
|
|
if (set & TIOCM_RTS)
|
| 1764 |
|
|
info->MCR |= UART_MCR_RTS;
|
| 1765 |
|
|
if (set & TIOCM_DTR)
|
| 1766 |
|
|
info->MCR |= UART_MCR_DTR;
|
| 1767 |
|
|
|
| 1768 |
|
|
if (clear & TIOCM_RTS)
|
| 1769 |
|
|
info->MCR &= ~UART_MCR_RTS;
|
| 1770 |
|
|
if (clear & TIOCM_DTR)
|
| 1771 |
|
|
info->MCR &= ~UART_MCR_DTR;
|
| 1772 |
|
|
|
| 1773 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
|
| 1774 |
|
|
serial_out(info, UART_ESI_CMD2, UART_MCR);
|
| 1775 |
|
|
serial_out(info, UART_ESI_CMD2, info->MCR);
|
| 1776 |
|
|
|
| 1777 |
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
| 1778 |
|
|
return 0;
|
| 1779 |
|
|
}
|
| 1780 |
|
|
|
| 1781 |
|
|
/*
|
| 1782 |
|
|
* rs_break() --- routine which turns the break handling on or off
|
| 1783 |
|
|
*/
|
| 1784 |
|
|
static void esp_break(struct tty_struct *tty, int break_state)
|
| 1785 |
|
|
{
|
| 1786 |
|
|
struct esp_struct * info = (struct esp_struct *)tty->driver_data;
|
| 1787 |
|
|
unsigned long flags;
|
| 1788 |
|
|
|
| 1789 |
|
|
if (serial_paranoia_check(info, tty->name, "esp_break"))
|
| 1790 |
|
|
return;
|
| 1791 |
|
|
|
| 1792 |
|
|
if (break_state == -1) {
|
| 1793 |
|
|
spin_lock_irqsave(&info->lock, flags);
|
| 1794 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_ISSUE_BREAK);
|
| 1795 |
|
|
serial_out(info, UART_ESI_CMD2, 0x01);
|
| 1796 |
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
| 1797 |
|
|
|
| 1798 |
|
|
/* FIXME - new style wait needed here */
|
| 1799 |
|
|
interruptible_sleep_on(&info->break_wait);
|
| 1800 |
|
|
} else {
|
| 1801 |
|
|
spin_lock_irqsave(&info->lock, flags);
|
| 1802 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_ISSUE_BREAK);
|
| 1803 |
|
|
serial_out(info, UART_ESI_CMD2, 0x00);
|
| 1804 |
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
| 1805 |
|
|
}
|
| 1806 |
|
|
}
|
| 1807 |
|
|
|
| 1808 |
|
|
static int rs_ioctl(struct tty_struct *tty, struct file * file,
|
| 1809 |
|
|
unsigned int cmd, unsigned long arg)
|
| 1810 |
|
|
{
|
| 1811 |
|
|
struct esp_struct * info = (struct esp_struct *)tty->driver_data;
|
| 1812 |
|
|
struct async_icount cprev, cnow; /* kernel counter temps */
|
| 1813 |
|
|
struct serial_icounter_struct __user *p_cuser; /* user space */
|
| 1814 |
|
|
void __user *argp = (void __user *)arg;
|
| 1815 |
|
|
unsigned long flags;
|
| 1816 |
|
|
|
| 1817 |
|
|
if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
|
| 1818 |
|
|
return -ENODEV;
|
| 1819 |
|
|
|
| 1820 |
|
|
if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
|
| 1821 |
|
|
(cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) &&
|
| 1822 |
|
|
(cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT) &&
|
| 1823 |
|
|
(cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT) &&
|
| 1824 |
|
|
(cmd != TIOCGHAYESESP) && (cmd != TIOCSHAYESESP)) {
|
| 1825 |
|
|
if (tty->flags & (1 << TTY_IO_ERROR))
|
| 1826 |
|
|
return -EIO;
|
| 1827 |
|
|
}
|
| 1828 |
|
|
|
| 1829 |
|
|
switch (cmd) {
|
| 1830 |
|
|
case TIOCGSERIAL:
|
| 1831 |
|
|
return get_serial_info(info, argp);
|
| 1832 |
|
|
case TIOCSSERIAL:
|
| 1833 |
|
|
return set_serial_info(info, argp);
|
| 1834 |
|
|
case TIOCSERCONFIG:
|
| 1835 |
|
|
/* do not reconfigure after initial configuration */
|
| 1836 |
|
|
return 0;
|
| 1837 |
|
|
|
| 1838 |
|
|
case TIOCSERGWILD:
|
| 1839 |
|
|
return put_user(0L, (unsigned long __user *)argp);
|
| 1840 |
|
|
|
| 1841 |
|
|
case TIOCSERGETLSR: /* Get line status register */
|
| 1842 |
|
|
return get_lsr_info(info, argp);
|
| 1843 |
|
|
|
| 1844 |
|
|
case TIOCSERSWILD:
|
| 1845 |
|
|
if (!capable(CAP_SYS_ADMIN))
|
| 1846 |
|
|
return -EPERM;
|
| 1847 |
|
|
return 0;
|
| 1848 |
|
|
|
| 1849 |
|
|
/*
|
| 1850 |
|
|
* Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
|
| 1851 |
|
|
* - mask passed in arg for lines of interest
|
| 1852 |
|
|
* (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
|
| 1853 |
|
|
* Caller should use TIOCGICOUNT to see which one it was
|
| 1854 |
|
|
*/
|
| 1855 |
|
|
case TIOCMIWAIT:
|
| 1856 |
|
|
spin_lock_irqsave(&info->lock, flags);
|
| 1857 |
|
|
cprev = info->icount; /* note the counters on entry */
|
| 1858 |
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
| 1859 |
|
|
while (1) {
|
| 1860 |
|
|
/* FIXME: convert to new style wakeup */
|
| 1861 |
|
|
interruptible_sleep_on(&info->delta_msr_wait);
|
| 1862 |
|
|
/* see if a signal did it */
|
| 1863 |
|
|
if (signal_pending(current))
|
| 1864 |
|
|
return -ERESTARTSYS;
|
| 1865 |
|
|
spin_lock_irqsave(&info->lock, flags);
|
| 1866 |
|
|
cnow = info->icount; /* atomic copy */
|
| 1867 |
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
| 1868 |
|
|
if (cnow.rng == cprev.rng &&
|
| 1869 |
|
|
cnow.dsr == cprev.dsr &&
|
| 1870 |
|
|
cnow.dcd == cprev.dcd &&
|
| 1871 |
|
|
cnow.cts == cprev.cts)
|
| 1872 |
|
|
return -EIO; /* no change => error */
|
| 1873 |
|
|
if (((arg & TIOCM_RNG) &&
|
| 1874 |
|
|
(cnow.rng != cprev.rng)) ||
|
| 1875 |
|
|
((arg & TIOCM_DSR) &&
|
| 1876 |
|
|
(cnow.dsr != cprev.dsr)) ||
|
| 1877 |
|
|
((arg & TIOCM_CD) &&
|
| 1878 |
|
|
(cnow.dcd != cprev.dcd)) ||
|
| 1879 |
|
|
((arg & TIOCM_CTS) &&
|
| 1880 |
|
|
(cnow.cts != cprev.cts)) ) {
|
| 1881 |
|
|
return 0;
|
| 1882 |
|
|
}
|
| 1883 |
|
|
cprev = cnow;
|
| 1884 |
|
|
}
|
| 1885 |
|
|
/* NOTREACHED */
|
| 1886 |
|
|
|
| 1887 |
|
|
/*
|
| 1888 |
|
|
* Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
|
| 1889 |
|
|
* Return: write counters to the user passed counter struct
|
| 1890 |
|
|
* NB: both 1->0 and 0->1 transitions are counted except for
|
| 1891 |
|
|
* RI where only 0->1 is counted.
|
| 1892 |
|
|
*/
|
| 1893 |
|
|
case TIOCGICOUNT:
|
| 1894 |
|
|
spin_lock_irqsave(&info->lock, flags);
|
| 1895 |
|
|
cnow = info->icount;
|
| 1896 |
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
| 1897 |
|
|
p_cuser = argp;
|
| 1898 |
|
|
if (put_user(cnow.cts, &p_cuser->cts) ||
|
| 1899 |
|
|
put_user(cnow.dsr, &p_cuser->dsr) ||
|
| 1900 |
|
|
put_user(cnow.rng, &p_cuser->rng) ||
|
| 1901 |
|
|
put_user(cnow.dcd, &p_cuser->dcd))
|
| 1902 |
|
|
return -EFAULT;
|
| 1903 |
|
|
|
| 1904 |
|
|
return 0;
|
| 1905 |
|
|
case TIOCGHAYESESP:
|
| 1906 |
|
|
return get_esp_config(info, argp);
|
| 1907 |
|
|
case TIOCSHAYESESP:
|
| 1908 |
|
|
return set_esp_config(info, argp);
|
| 1909 |
|
|
|
| 1910 |
|
|
default:
|
| 1911 |
|
|
return -ENOIOCTLCMD;
|
| 1912 |
|
|
}
|
| 1913 |
|
|
return 0;
|
| 1914 |
|
|
}
|
| 1915 |
|
|
|
| 1916 |
|
|
static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
|
| 1917 |
|
|
{
|
| 1918 |
|
|
struct esp_struct *info = (struct esp_struct *)tty->driver_data;
|
| 1919 |
|
|
unsigned long flags;
|
| 1920 |
|
|
|
| 1921 |
|
|
change_speed(info);
|
| 1922 |
|
|
|
| 1923 |
|
|
spin_lock_irqsave(&info->lock, flags);
|
| 1924 |
|
|
|
| 1925 |
|
|
/* Handle transition to B0 status */
|
| 1926 |
|
|
if ((old_termios->c_cflag & CBAUD) &&
|
| 1927 |
|
|
!(tty->termios->c_cflag & CBAUD)) {
|
| 1928 |
|
|
info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS);
|
| 1929 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
|
| 1930 |
|
|
serial_out(info, UART_ESI_CMD2, UART_MCR);
|
| 1931 |
|
|
serial_out(info, UART_ESI_CMD2, info->MCR);
|
| 1932 |
|
|
}
|
| 1933 |
|
|
|
| 1934 |
|
|
/* Handle transition away from B0 status */
|
| 1935 |
|
|
if (!(old_termios->c_cflag & CBAUD) &&
|
| 1936 |
|
|
(tty->termios->c_cflag & CBAUD)) {
|
| 1937 |
|
|
info->MCR |= (UART_MCR_DTR | UART_MCR_RTS);
|
| 1938 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
|
| 1939 |
|
|
serial_out(info, UART_ESI_CMD2, UART_MCR);
|
| 1940 |
|
|
serial_out(info, UART_ESI_CMD2, info->MCR);
|
| 1941 |
|
|
}
|
| 1942 |
|
|
|
| 1943 |
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
| 1944 |
|
|
|
| 1945 |
|
|
/* Handle turning of CRTSCTS */
|
| 1946 |
|
|
if ((old_termios->c_cflag & CRTSCTS) &&
|
| 1947 |
|
|
!(tty->termios->c_cflag & CRTSCTS)) {
|
| 1948 |
|
|
rs_start(tty);
|
| 1949 |
|
|
}
|
| 1950 |
|
|
}
|
| 1951 |
|
|
|
| 1952 |
|
|
/*
|
| 1953 |
|
|
* ------------------------------------------------------------
|
| 1954 |
|
|
* rs_close()
|
| 1955 |
|
|
*
|
| 1956 |
|
|
* This routine is called when the serial port gets closed. First, we
|
| 1957 |
|
|
* wait for the last remaining data to be sent. Then, we unlink its
|
| 1958 |
|
|
* async structure from the interrupt chain if necessary, and we free
|
| 1959 |
|
|
* that IRQ if nothing is left in the chain.
|
| 1960 |
|
|
* ------------------------------------------------------------
|
| 1961 |
|
|
*/
|
| 1962 |
|
|
static void rs_close(struct tty_struct *tty, struct file * filp)
|
| 1963 |
|
|
{
|
| 1964 |
|
|
struct esp_struct * info = (struct esp_struct *)tty->driver_data;
|
| 1965 |
|
|
unsigned long flags;
|
| 1966 |
|
|
|
| 1967 |
|
|
if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
|
| 1968 |
|
|
return;
|
| 1969 |
|
|
|
| 1970 |
|
|
spin_lock_irqsave(&info->lock, flags);
|
| 1971 |
|
|
|
| 1972 |
|
|
if (tty_hung_up_p(filp)) {
|
| 1973 |
|
|
DBG_CNT("before DEC-hung");
|
| 1974 |
|
|
goto out;
|
| 1975 |
|
|
}
|
| 1976 |
|
|
|
| 1977 |
|
|
#ifdef SERIAL_DEBUG_OPEN
|
| 1978 |
|
|
printk("rs_close ttys%d, count = %d\n", info->line, info->count);
|
| 1979 |
|
|
#endif
|
| 1980 |
|
|
if ((tty->count == 1) && (info->count != 1)) {
|
| 1981 |
|
|
/*
|
| 1982 |
|
|
* Uh, oh. tty->count is 1, which means that the tty
|
| 1983 |
|
|
* structure will be freed. Info->count should always
|
| 1984 |
|
|
* be one in these conditions. If it's greater than
|
| 1985 |
|
|
* one, we've got real problems, since it means the
|
| 1986 |
|
|
* serial port won't be shutdown.
|
| 1987 |
|
|
*/
|
| 1988 |
|
|
printk("rs_close: bad serial port count; tty->count is 1, "
|
| 1989 |
|
|
"info->count is %d\n", info->count);
|
| 1990 |
|
|
info->count = 1;
|
| 1991 |
|
|
}
|
| 1992 |
|
|
if (--info->count < 0) {
|
| 1993 |
|
|
printk("rs_close: bad serial port count for ttys%d: %d\n",
|
| 1994 |
|
|
info->line, info->count);
|
| 1995 |
|
|
info->count = 0;
|
| 1996 |
|
|
}
|
| 1997 |
|
|
if (info->count) {
|
| 1998 |
|
|
DBG_CNT("before DEC-2");
|
| 1999 |
|
|
goto out;
|
| 2000 |
|
|
}
|
| 2001 |
|
|
info->flags |= ASYNC_CLOSING;
|
| 2002 |
|
|
|
| 2003 |
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
| 2004 |
|
|
/*
|
| 2005 |
|
|
* Now we wait for the transmit buffer to clear; and we notify
|
| 2006 |
|
|
* the line discipline to only process XON/XOFF characters.
|
| 2007 |
|
|
*/
|
| 2008 |
|
|
tty->closing = 1;
|
| 2009 |
|
|
if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
|
| 2010 |
|
|
tty_wait_until_sent(tty, info->closing_wait);
|
| 2011 |
|
|
/*
|
| 2012 |
|
|
* At this point we stop accepting input. To do this, we
|
| 2013 |
|
|
* disable the receive line status interrupts, and tell the
|
| 2014 |
|
|
* interrupt driver to stop checking the data ready bit in the
|
| 2015 |
|
|
* line status register.
|
| 2016 |
|
|
*/
|
| 2017 |
|
|
/* info->IER &= ~UART_IER_RLSI; */
|
| 2018 |
|
|
info->IER &= ~UART_IER_RDI;
|
| 2019 |
|
|
info->read_status_mask &= ~UART_LSR_DR;
|
| 2020 |
|
|
if (info->flags & ASYNC_INITIALIZED) {
|
| 2021 |
|
|
|
| 2022 |
|
|
spin_lock_irqsave(&info->lock, flags);
|
| 2023 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
|
| 2024 |
|
|
serial_out(info, UART_ESI_CMD2, info->IER);
|
| 2025 |
|
|
|
| 2026 |
|
|
/* disable receive timeout */
|
| 2027 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
|
| 2028 |
|
|
serial_out(info, UART_ESI_CMD2, 0x00);
|
| 2029 |
|
|
|
| 2030 |
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
| 2031 |
|
|
|
| 2032 |
|
|
/*
|
| 2033 |
|
|
* Before we drop DTR, make sure the UART transmitter
|
| 2034 |
|
|
* has completely drained; this is especially
|
| 2035 |
|
|
* important if there is a transmit FIFO!
|
| 2036 |
|
|
*/
|
| 2037 |
|
|
rs_wait_until_sent(tty, info->timeout);
|
| 2038 |
|
|
}
|
| 2039 |
|
|
shutdown(info);
|
| 2040 |
|
|
if (tty->driver->flush_buffer)
|
| 2041 |
|
|
tty->driver->flush_buffer(tty);
|
| 2042 |
|
|
tty_ldisc_flush(tty);
|
| 2043 |
|
|
tty->closing = 0;
|
| 2044 |
|
|
info->event = 0;
|
| 2045 |
|
|
info->tty = NULL;
|
| 2046 |
|
|
|
| 2047 |
|
|
if (info->blocked_open) {
|
| 2048 |
|
|
if (info->close_delay) {
|
| 2049 |
|
|
msleep_interruptible(jiffies_to_msecs(info->close_delay));
|
| 2050 |
|
|
}
|
| 2051 |
|
|
wake_up_interruptible(&info->open_wait);
|
| 2052 |
|
|
}
|
| 2053 |
|
|
info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
|
| 2054 |
|
|
wake_up_interruptible(&info->close_wait);
|
| 2055 |
|
|
return;
|
| 2056 |
|
|
|
| 2057 |
|
|
out:
|
| 2058 |
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
| 2059 |
|
|
}
|
| 2060 |
|
|
|
| 2061 |
|
|
static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
|
| 2062 |
|
|
{
|
| 2063 |
|
|
struct esp_struct *info = (struct esp_struct *)tty->driver_data;
|
| 2064 |
|
|
unsigned long orig_jiffies, char_time;
|
| 2065 |
|
|
unsigned long flags;
|
| 2066 |
|
|
|
| 2067 |
|
|
if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
|
| 2068 |
|
|
return;
|
| 2069 |
|
|
|
| 2070 |
|
|
orig_jiffies = jiffies;
|
| 2071 |
|
|
char_time = ((info->timeout - HZ / 50) / 1024) / 5;
|
| 2072 |
|
|
|
| 2073 |
|
|
if (!char_time)
|
| 2074 |
|
|
char_time = 1;
|
| 2075 |
|
|
|
| 2076 |
|
|
spin_lock_irqsave(&info->lock, flags);
|
| 2077 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
|
| 2078 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
|
| 2079 |
|
|
|
| 2080 |
|
|
while ((serial_in(info, UART_ESI_STAT1) != 0x03) ||
|
| 2081 |
|
|
(serial_in(info, UART_ESI_STAT2) != 0xff)) {
|
| 2082 |
|
|
|
| 2083 |
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
| 2084 |
|
|
msleep_interruptible(jiffies_to_msecs(char_time));
|
| 2085 |
|
|
|
| 2086 |
|
|
if (signal_pending(current))
|
| 2087 |
|
|
break;
|
| 2088 |
|
|
|
| 2089 |
|
|
if (timeout && time_after(jiffies, orig_jiffies + timeout))
|
| 2090 |
|
|
break;
|
| 2091 |
|
|
|
| 2092 |
|
|
spin_lock_irqsave(&info->lock, flags);
|
| 2093 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
|
| 2094 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
|
| 2095 |
|
|
}
|
| 2096 |
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
| 2097 |
|
|
set_current_state(TASK_RUNNING);
|
| 2098 |
|
|
}
|
| 2099 |
|
|
|
| 2100 |
|
|
/*
|
| 2101 |
|
|
* esp_hangup() --- called by tty_hangup() when a hangup is signaled.
|
| 2102 |
|
|
*/
|
| 2103 |
|
|
static void esp_hangup(struct tty_struct *tty)
|
| 2104 |
|
|
{
|
| 2105 |
|
|
struct esp_struct * info = (struct esp_struct *)tty->driver_data;
|
| 2106 |
|
|
|
| 2107 |
|
|
if (serial_paranoia_check(info, tty->name, "esp_hangup"))
|
| 2108 |
|
|
return;
|
| 2109 |
|
|
|
| 2110 |
|
|
rs_flush_buffer(tty);
|
| 2111 |
|
|
shutdown(info);
|
| 2112 |
|
|
info->event = 0;
|
| 2113 |
|
|
info->count = 0;
|
| 2114 |
|
|
info->flags &= ~ASYNC_NORMAL_ACTIVE;
|
| 2115 |
|
|
info->tty = NULL;
|
| 2116 |
|
|
wake_up_interruptible(&info->open_wait);
|
| 2117 |
|
|
}
|
| 2118 |
|
|
|
| 2119 |
|
|
/*
|
| 2120 |
|
|
* ------------------------------------------------------------
|
| 2121 |
|
|
* esp_open() and friends
|
| 2122 |
|
|
* ------------------------------------------------------------
|
| 2123 |
|
|
*/
|
| 2124 |
|
|
static int block_til_ready(struct tty_struct *tty, struct file * filp,
|
| 2125 |
|
|
struct esp_struct *info)
|
| 2126 |
|
|
{
|
| 2127 |
|
|
DECLARE_WAITQUEUE(wait, current);
|
| 2128 |
|
|
int retval;
|
| 2129 |
|
|
int do_clocal = 0;
|
| 2130 |
|
|
unsigned long flags;
|
| 2131 |
|
|
|
| 2132 |
|
|
/*
|
| 2133 |
|
|
* If the device is in the middle of being closed, then block
|
| 2134 |
|
|
* until it's done, and then try again.
|
| 2135 |
|
|
*/
|
| 2136 |
|
|
if (tty_hung_up_p(filp) ||
|
| 2137 |
|
|
(info->flags & ASYNC_CLOSING)) {
|
| 2138 |
|
|
if (info->flags & ASYNC_CLOSING)
|
| 2139 |
|
|
interruptible_sleep_on(&info->close_wait);
|
| 2140 |
|
|
#ifdef SERIAL_DO_RESTART
|
| 2141 |
|
|
if (info->flags & ASYNC_HUP_NOTIFY)
|
| 2142 |
|
|
return -EAGAIN;
|
| 2143 |
|
|
else
|
| 2144 |
|
|
return -ERESTARTSYS;
|
| 2145 |
|
|
#else
|
| 2146 |
|
|
return -EAGAIN;
|
| 2147 |
|
|
#endif
|
| 2148 |
|
|
}
|
| 2149 |
|
|
|
| 2150 |
|
|
/*
|
| 2151 |
|
|
* If non-blocking mode is set, or the port is not enabled,
|
| 2152 |
|
|
* then make the check up front and then exit.
|
| 2153 |
|
|
*/
|
| 2154 |
|
|
if ((filp->f_flags & O_NONBLOCK) ||
|
| 2155 |
|
|
(tty->flags & (1 << TTY_IO_ERROR))) {
|
| 2156 |
|
|
info->flags |= ASYNC_NORMAL_ACTIVE;
|
| 2157 |
|
|
return 0;
|
| 2158 |
|
|
}
|
| 2159 |
|
|
|
| 2160 |
|
|
if (tty->termios->c_cflag & CLOCAL)
|
| 2161 |
|
|
do_clocal = 1;
|
| 2162 |
|
|
|
| 2163 |
|
|
/*
|
| 2164 |
|
|
* Block waiting for the carrier detect and the line to become
|
| 2165 |
|
|
* free (i.e., not in use by the callout). While we are in
|
| 2166 |
|
|
* this loop, info->count is dropped by one, so that
|
| 2167 |
|
|
* rs_close() knows when to free things. We restore it upon
|
| 2168 |
|
|
* exit, either normal or abnormal.
|
| 2169 |
|
|
*/
|
| 2170 |
|
|
retval = 0;
|
| 2171 |
|
|
add_wait_queue(&info->open_wait, &wait);
|
| 2172 |
|
|
#ifdef SERIAL_DEBUG_OPEN
|
| 2173 |
|
|
printk("block_til_ready before block: ttys%d, count = %d\n",
|
| 2174 |
|
|
info->line, info->count);
|
| 2175 |
|
|
#endif
|
| 2176 |
|
|
spin_lock_irqsave(&info->lock, flags);
|
| 2177 |
|
|
if (!tty_hung_up_p(filp))
|
| 2178 |
|
|
info->count--;
|
| 2179 |
|
|
info->blocked_open++;
|
| 2180 |
|
|
while (1) {
|
| 2181 |
|
|
if ((tty->termios->c_cflag & CBAUD)) {
|
| 2182 |
|
|
unsigned int scratch;
|
| 2183 |
|
|
|
| 2184 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_READ_UART);
|
| 2185 |
|
|
serial_out(info, UART_ESI_CMD2, UART_MCR);
|
| 2186 |
|
|
scratch = serial_in(info, UART_ESI_STAT1);
|
| 2187 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
|
| 2188 |
|
|
serial_out(info, UART_ESI_CMD2, UART_MCR);
|
| 2189 |
|
|
serial_out(info, UART_ESI_CMD2,
|
| 2190 |
|
|
scratch | UART_MCR_DTR | UART_MCR_RTS);
|
| 2191 |
|
|
}
|
| 2192 |
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
| 2193 |
|
|
if (tty_hung_up_p(filp) ||
|
| 2194 |
|
|
!(info->flags & ASYNC_INITIALIZED)) {
|
| 2195 |
|
|
#ifdef SERIAL_DO_RESTART
|
| 2196 |
|
|
if (info->flags & ASYNC_HUP_NOTIFY)
|
| 2197 |
|
|
retval = -EAGAIN;
|
| 2198 |
|
|
else
|
| 2199 |
|
|
retval = -ERESTARTSYS;
|
| 2200 |
|
|
#else
|
| 2201 |
|
|
retval = -EAGAIN;
|
| 2202 |
|
|
#endif
|
| 2203 |
|
|
break;
|
| 2204 |
|
|
}
|
| 2205 |
|
|
|
| 2206 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
|
| 2207 |
|
|
if (serial_in(info, UART_ESI_STAT2) & UART_MSR_DCD)
|
| 2208 |
|
|
do_clocal = 1;
|
| 2209 |
|
|
|
| 2210 |
|
|
if (!(info->flags & ASYNC_CLOSING) &&
|
| 2211 |
|
|
(do_clocal))
|
| 2212 |
|
|
break;
|
| 2213 |
|
|
if (signal_pending(current)) {
|
| 2214 |
|
|
retval = -ERESTARTSYS;
|
| 2215 |
|
|
break;
|
| 2216 |
|
|
}
|
| 2217 |
|
|
#ifdef SERIAL_DEBUG_OPEN
|
| 2218 |
|
|
printk("block_til_ready blocking: ttys%d, count = %d\n",
|
| 2219 |
|
|
info->line, info->count);
|
| 2220 |
|
|
#endif
|
| 2221 |
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
| 2222 |
|
|
schedule();
|
| 2223 |
|
|
spin_lock_irqsave(&info->lock, flags);
|
| 2224 |
|
|
}
|
| 2225 |
|
|
set_current_state(TASK_RUNNING);
|
| 2226 |
|
|
remove_wait_queue(&info->open_wait, &wait);
|
| 2227 |
|
|
if (!tty_hung_up_p(filp))
|
| 2228 |
|
|
info->count++;
|
| 2229 |
|
|
info->blocked_open--;
|
| 2230 |
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
| 2231 |
|
|
#ifdef SERIAL_DEBUG_OPEN
|
| 2232 |
|
|
printk("block_til_ready after blocking: ttys%d, count = %d\n",
|
| 2233 |
|
|
info->line, info->count);
|
| 2234 |
|
|
#endif
|
| 2235 |
|
|
if (retval)
|
| 2236 |
|
|
return retval;
|
| 2237 |
|
|
info->flags |= ASYNC_NORMAL_ACTIVE;
|
| 2238 |
|
|
return 0;
|
| 2239 |
|
|
}
|
| 2240 |
|
|
|
| 2241 |
|
|
/*
|
| 2242 |
|
|
* This routine is called whenever a serial port is opened. It
|
| 2243 |
|
|
* enables interrupts for a serial port, linking in its async structure into
|
| 2244 |
|
|
* the IRQ chain. It also performs the serial-specific
|
| 2245 |
|
|
* initialization for the tty structure.
|
| 2246 |
|
|
*/
|
| 2247 |
|
|
static int esp_open(struct tty_struct *tty, struct file * filp)
|
| 2248 |
|
|
{
|
| 2249 |
|
|
struct esp_struct *info;
|
| 2250 |
|
|
int retval, line;
|
| 2251 |
|
|
unsigned long flags;
|
| 2252 |
|
|
|
| 2253 |
|
|
line = tty->index;
|
| 2254 |
|
|
if ((line < 0) || (line >= NR_PORTS))
|
| 2255 |
|
|
return -ENODEV;
|
| 2256 |
|
|
|
| 2257 |
|
|
/* find the port in the chain */
|
| 2258 |
|
|
|
| 2259 |
|
|
info = ports;
|
| 2260 |
|
|
|
| 2261 |
|
|
while (info && (info->line != line))
|
| 2262 |
|
|
info = info->next_port;
|
| 2263 |
|
|
|
| 2264 |
|
|
if (!info) {
|
| 2265 |
|
|
serial_paranoia_check(info, tty->name, "esp_open");
|
| 2266 |
|
|
return -ENODEV;
|
| 2267 |
|
|
}
|
| 2268 |
|
|
|
| 2269 |
|
|
#ifdef SERIAL_DEBUG_OPEN
|
| 2270 |
|
|
printk("esp_open %s, count = %d\n", tty->name, info->count);
|
| 2271 |
|
|
#endif
|
| 2272 |
|
|
spin_lock_irqsave(&info->lock, flags);
|
| 2273 |
|
|
info->count++;
|
| 2274 |
|
|
tty->driver_data = info;
|
| 2275 |
|
|
info->tty = tty;
|
| 2276 |
|
|
|
| 2277 |
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
| 2278 |
|
|
|
| 2279 |
|
|
/*
|
| 2280 |
|
|
* Start up serial port
|
| 2281 |
|
|
*/
|
| 2282 |
|
|
retval = startup(info);
|
| 2283 |
|
|
if (retval)
|
| 2284 |
|
|
return retval;
|
| 2285 |
|
|
|
| 2286 |
|
|
retval = block_til_ready(tty, filp, info);
|
| 2287 |
|
|
if (retval) {
|
| 2288 |
|
|
#ifdef SERIAL_DEBUG_OPEN
|
| 2289 |
|
|
printk("esp_open returning after block_til_ready with %d\n",
|
| 2290 |
|
|
retval);
|
| 2291 |
|
|
#endif
|
| 2292 |
|
|
return retval;
|
| 2293 |
|
|
}
|
| 2294 |
|
|
|
| 2295 |
|
|
#ifdef SERIAL_DEBUG_OPEN
|
| 2296 |
|
|
printk("esp_open %s successful...", tty->name);
|
| 2297 |
|
|
#endif
|
| 2298 |
|
|
return 0;
|
| 2299 |
|
|
}
|
| 2300 |
|
|
|
| 2301 |
|
|
/*
|
| 2302 |
|
|
* ---------------------------------------------------------------------
|
| 2303 |
|
|
* espserial_init() and friends
|
| 2304 |
|
|
*
|
| 2305 |
|
|
* espserial_init() is called at boot-time to initialize the serial driver.
|
| 2306 |
|
|
* ---------------------------------------------------------------------
|
| 2307 |
|
|
*/
|
| 2308 |
|
|
|
| 2309 |
|
|
/*
|
| 2310 |
|
|
* This routine prints out the appropriate serial driver version
|
| 2311 |
|
|
* number, and identifies which options were configured into this
|
| 2312 |
|
|
* driver.
|
| 2313 |
|
|
*/
|
| 2314 |
|
|
|
| 2315 |
|
|
static inline void show_serial_version(void)
|
| 2316 |
|
|
{
|
| 2317 |
|
|
printk(KERN_INFO "%s version %s (DMA %u)\n",
|
| 2318 |
|
|
serial_name, serial_version, dma);
|
| 2319 |
|
|
}
|
| 2320 |
|
|
|
| 2321 |
|
|
/*
|
| 2322 |
|
|
* This routine is called by espserial_init() to initialize a specific serial
|
| 2323 |
|
|
* port.
|
| 2324 |
|
|
*/
|
| 2325 |
|
|
static inline int autoconfig(struct esp_struct * info)
|
| 2326 |
|
|
{
|
| 2327 |
|
|
int port_detected = 0;
|
| 2328 |
|
|
unsigned long flags;
|
| 2329 |
|
|
|
| 2330 |
|
|
if (!request_region(info->port, REGION_SIZE, "esp serial"))
|
| 2331 |
|
|
return -EIO;
|
| 2332 |
|
|
|
| 2333 |
|
|
spin_lock_irqsave(&info->lock, flags);
|
| 2334 |
|
|
/*
|
| 2335 |
|
|
* Check for ESP card
|
| 2336 |
|
|
*/
|
| 2337 |
|
|
|
| 2338 |
|
|
if (serial_in(info, UART_ESI_BASE) == 0xf3) {
|
| 2339 |
|
|
serial_out(info, UART_ESI_CMD1, 0x00);
|
| 2340 |
|
|
serial_out(info, UART_ESI_CMD1, 0x01);
|
| 2341 |
|
|
|
| 2342 |
|
|
if ((serial_in(info, UART_ESI_STAT2) & 0x70) == 0x20) {
|
| 2343 |
|
|
port_detected = 1;
|
| 2344 |
|
|
|
| 2345 |
|
|
if (!(info->irq)) {
|
| 2346 |
|
|
serial_out(info, UART_ESI_CMD1, 0x02);
|
| 2347 |
|
|
|
| 2348 |
|
|
if (serial_in(info, UART_ESI_STAT1) & 0x01)
|
| 2349 |
|
|
info->irq = 3;
|
| 2350 |
|
|
else
|
| 2351 |
|
|
info->irq = 4;
|
| 2352 |
|
|
}
|
| 2353 |
|
|
|
| 2354 |
|
|
|
| 2355 |
|
|
/* put card in enhanced mode */
|
| 2356 |
|
|
/* this prevents access through */
|
| 2357 |
|
|
/* the "old" IO ports */
|
| 2358 |
|
|
esp_basic_init(info);
|
| 2359 |
|
|
|
| 2360 |
|
|
/* clear out MCR */
|
| 2361 |
|
|
serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
|
| 2362 |
|
|
serial_out(info, UART_ESI_CMD2, UART_MCR);
|
| 2363 |
|
|
serial_out(info, UART_ESI_CMD2, 0x00);
|
| 2364 |
|
|
}
|
| 2365 |
|
|
}
|
| 2366 |
|
|
if (!port_detected)
|
| 2367 |
|
|
release_region(info->port, REGION_SIZE);
|
| 2368 |
|
|
|
| 2369 |
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
| 2370 |
|
|
return (port_detected);
|
| 2371 |
|
|
}
|
| 2372 |
|
|
|
| 2373 |
|
|
static const struct tty_operations esp_ops = {
|
| 2374 |
|
|
.open = esp_open,
|
| 2375 |
|
|
.close = rs_close,
|
| 2376 |
|
|
.write = rs_write,
|
| 2377 |
|
|
.put_char = rs_put_char,
|
| 2378 |
|
|
.flush_chars = rs_flush_chars,
|
| 2379 |
|
|
.write_room = rs_write_room,
|
| 2380 |
|
|
.chars_in_buffer = rs_chars_in_buffer,
|
| 2381 |
|
|
.flush_buffer = rs_flush_buffer,
|
| 2382 |
|
|
.ioctl = rs_ioctl,
|
| 2383 |
|
|
.throttle = rs_throttle,
|
| 2384 |
|
|
.unthrottle = rs_unthrottle,
|
| 2385 |
|
|
.set_termios = rs_set_termios,
|
| 2386 |
|
|
.stop = rs_stop,
|
| 2387 |
|
|
.start = rs_start,
|
| 2388 |
|
|
.hangup = esp_hangup,
|
| 2389 |
|
|
.break_ctl = esp_break,
|
| 2390 |
|
|
.wait_until_sent = rs_wait_until_sent,
|
| 2391 |
|
|
.tiocmget = esp_tiocmget,
|
| 2392 |
|
|
.tiocmset = esp_tiocmset,
|
| 2393 |
|
|
};
|
| 2394 |
|
|
|
| 2395 |
|
|
/*
|
| 2396 |
|
|
* The serial driver boot-time initialization code!
|
| 2397 |
|
|
*/
|
| 2398 |
|
|
static int __init espserial_init(void)
|
| 2399 |
|
|
{
|
| 2400 |
|
|
int i, offset;
|
| 2401 |
|
|
struct esp_struct * info;
|
| 2402 |
|
|
struct esp_struct *last_primary = NULL;
|
| 2403 |
|
|
int esp[] = {0x100,0x140,0x180,0x200,0x240,0x280,0x300,0x380};
|
| 2404 |
|
|
|
| 2405 |
|
|
esp_driver = alloc_tty_driver(NR_PORTS);
|
| 2406 |
|
|
if (!esp_driver)
|
| 2407 |
|
|
return -ENOMEM;
|
| 2408 |
|
|
|
| 2409 |
|
|
for (i = 0; i < NR_PRIMARY; i++) {
|
| 2410 |
|
|
if (irq[i] != 0) {
|
| 2411 |
|
|
if ((irq[i] < 2) || (irq[i] > 15) || (irq[i] == 6) ||
|
| 2412 |
|
|
(irq[i] == 8) || (irq[i] == 13))
|
| 2413 |
|
|
irq[i] = 0;
|
| 2414 |
|
|
else if (irq[i] == 2)
|
| 2415 |
|
|
irq[i] = 9;
|
| 2416 |
|
|
}
|
| 2417 |
|
|
}
|
| 2418 |
|
|
|
| 2419 |
|
|
if ((dma != 1) && (dma != 3))
|
| 2420 |
|
|
dma = 0;
|
| 2421 |
|
|
|
| 2422 |
|
|
if ((rx_trigger < 1) || (rx_trigger > 1023))
|
| 2423 |
|
|
rx_trigger = 768;
|
| 2424 |
|
|
|
| 2425 |
|
|
if ((tx_trigger < 1) || (tx_trigger > 1023))
|
| 2426 |
|
|
tx_trigger = 768;
|
| 2427 |
|
|
|
| 2428 |
|
|
if ((flow_off < 1) || (flow_off > 1023))
|
| 2429 |
|
|
flow_off = 1016;
|
| 2430 |
|
|
|
| 2431 |
|
|
if ((flow_on < 1) || (flow_on > 1023))
|
| 2432 |
|
|
flow_on = 944;
|
| 2433 |
|
|
|
| 2434 |
|
|
if ((rx_timeout < 0) || (rx_timeout > 255))
|
| 2435 |
|
|
rx_timeout = 128;
|
| 2436 |
|
|
|
| 2437 |
|
|
if (flow_on >= flow_off)
|
| 2438 |
|
|
flow_on = flow_off - 1;
|
| 2439 |
|
|
|
| 2440 |
|
|
show_serial_version();
|
| 2441 |
|
|
|
| 2442 |
|
|
/* Initialize the tty_driver structure */
|
| 2443 |
|
|
|
| 2444 |
|
|
esp_driver->owner = THIS_MODULE;
|
| 2445 |
|
|
esp_driver->name = "ttyP";
|
| 2446 |
|
|
esp_driver->major = ESP_IN_MAJOR;
|
| 2447 |
|
|
esp_driver->minor_start = 0;
|
| 2448 |
|
|
esp_driver->type = TTY_DRIVER_TYPE_SERIAL;
|
| 2449 |
|
|
esp_driver->subtype = SERIAL_TYPE_NORMAL;
|
| 2450 |
|
|
esp_driver->init_termios = tty_std_termios;
|
| 2451 |
|
|
esp_driver->init_termios.c_cflag =
|
| 2452 |
|
|
B9600 | CS8 | CREAD | HUPCL | CLOCAL;
|
| 2453 |
|
|
esp_driver->flags = TTY_DRIVER_REAL_RAW;
|
| 2454 |
|
|
tty_set_operations(esp_driver, &esp_ops);
|
| 2455 |
|
|
if (tty_register_driver(esp_driver))
|
| 2456 |
|
|
{
|
| 2457 |
|
|
printk(KERN_ERR "Couldn't register esp serial driver");
|
| 2458 |
|
|
put_tty_driver(esp_driver);
|
| 2459 |
|
|
return 1;
|
| 2460 |
|
|
}
|
| 2461 |
|
|
|
| 2462 |
|
|
info = kzalloc(sizeof(struct esp_struct), GFP_KERNEL);
|
| 2463 |
|
|
|
| 2464 |
|
|
if (!info)
|
| 2465 |
|
|
{
|
| 2466 |
|
|
printk(KERN_ERR "Couldn't allocate memory for esp serial device information\n");
|
| 2467 |
|
|
tty_unregister_driver(esp_driver);
|
| 2468 |
|
|
put_tty_driver(esp_driver);
|
| 2469 |
|
|
return 1;
|
| 2470 |
|
|
}
|
| 2471 |
|
|
|
| 2472 |
|
|
spin_lock_init(&info->lock);
|
| 2473 |
|
|
/* rx_trigger, tx_trigger are needed by autoconfig */
|
| 2474 |
|
|
info->config.rx_trigger = rx_trigger;
|
| 2475 |
|
|
info->config.tx_trigger = tx_trigger;
|
| 2476 |
|
|
|
| 2477 |
|
|
i = 0;
|
| 2478 |
|
|
offset = 0;
|
| 2479 |
|
|
|
| 2480 |
|
|
do {
|
| 2481 |
|
|
info->port = esp[i] + offset;
|
| 2482 |
|
|
info->irq = irq[i];
|
| 2483 |
|
|
info->line = (i * 8) + (offset / 8);
|
| 2484 |
|
|
|
| 2485 |
|
|
if (!autoconfig(info)) {
|
| 2486 |
|
|
i++;
|
| 2487 |
|
|
offset = 0;
|
| 2488 |
|
|
continue;
|
| 2489 |
|
|
}
|
| 2490 |
|
|
|
| 2491 |
|
|
info->custom_divisor = (divisor[i] >> (offset / 2)) & 0xf;
|
| 2492 |
|
|
info->flags = STD_COM_FLAGS;
|
| 2493 |
|
|
if (info->custom_divisor)
|
| 2494 |
|
|
info->flags |= ASYNC_SPD_CUST;
|
| 2495 |
|
|
info->magic = ESP_MAGIC;
|
| 2496 |
|
|
info->close_delay = 5*HZ/10;
|
| 2497 |
|
|
info->closing_wait = 30*HZ;
|
| 2498 |
|
|
INIT_WORK(&info->tqueue, do_softint);
|
| 2499 |
|
|
INIT_WORK(&info->tqueue_hangup, do_serial_hangup);
|
| 2500 |
|
|
info->config.rx_timeout = rx_timeout;
|
| 2501 |
|
|
info->config.flow_on = flow_on;
|
| 2502 |
|
|
info->config.flow_off = flow_off;
|
| 2503 |
|
|
info->config.pio_threshold = pio_threshold;
|
| 2504 |
|
|
info->next_port = ports;
|
| 2505 |
|
|
init_waitqueue_head(&info->open_wait);
|
| 2506 |
|
|
init_waitqueue_head(&info->close_wait);
|
| 2507 |
|
|
init_waitqueue_head(&info->delta_msr_wait);
|
| 2508 |
|
|
init_waitqueue_head(&info->break_wait);
|
| 2509 |
|
|
ports = info;
|
| 2510 |
|
|
printk(KERN_INFO "ttyP%d at 0x%04x (irq = %d) is an ESP ",
|
| 2511 |
|
|
info->line, info->port, info->irq);
|
| 2512 |
|
|
|
| 2513 |
|
|
if (info->line % 8) {
|
| 2514 |
|
|
printk("secondary port\n");
|
| 2515 |
|
|
/* 8 port cards can't do DMA */
|
| 2516 |
|
|
info->stat_flags |= ESP_STAT_NEVER_DMA;
|
| 2517 |
|
|
|
| 2518 |
|
|
if (last_primary)
|
| 2519 |
|
|
last_primary->stat_flags |= ESP_STAT_NEVER_DMA;
|
| 2520 |
|
|
} else {
|
| 2521 |
|
|
printk("primary port\n");
|
| 2522 |
|
|
last_primary = info;
|
| 2523 |
|
|
irq[i] = info->irq;
|
| 2524 |
|
|
}
|
| 2525 |
|
|
|
| 2526 |
|
|
if (!dma)
|
| 2527 |
|
|
info->stat_flags |= ESP_STAT_NEVER_DMA;
|
| 2528 |
|
|
|
| 2529 |
|
|
info = kzalloc(sizeof(struct esp_struct), GFP_KERNEL);
|
| 2530 |
|
|
if (!info)
|
| 2531 |
|
|
{
|
| 2532 |
|
|
printk(KERN_ERR "Couldn't allocate memory for esp serial device information\n");
|
| 2533 |
|
|
|
| 2534 |
|
|
/* allow use of the already detected ports */
|
| 2535 |
|
|
return 0;
|
| 2536 |
|
|
}
|
| 2537 |
|
|
|
| 2538 |
|
|
/* rx_trigger, tx_trigger are needed by autoconfig */
|
| 2539 |
|
|
info->config.rx_trigger = rx_trigger;
|
| 2540 |
|
|
info->config.tx_trigger = tx_trigger;
|
| 2541 |
|
|
|
| 2542 |
|
|
if (offset == 56) {
|
| 2543 |
|
|
i++;
|
| 2544 |
|
|
offset = 0;
|
| 2545 |
|
|
} else {
|
| 2546 |
|
|
offset += 8;
|
| 2547 |
|
|
}
|
| 2548 |
|
|
} while (i < NR_PRIMARY);
|
| 2549 |
|
|
|
| 2550 |
|
|
/* free the last port memory allocation */
|
| 2551 |
|
|
kfree(info);
|
| 2552 |
|
|
|
| 2553 |
|
|
return 0;
|
| 2554 |
|
|
}
|
| 2555 |
|
|
|
| 2556 |
|
|
static void __exit espserial_exit(void)
|
| 2557 |
|
|
{
|
| 2558 |
|
|
int e1;
|
| 2559 |
|
|
struct esp_struct *temp_async;
|
| 2560 |
|
|
struct esp_pio_buffer *pio_buf;
|
| 2561 |
|
|
|
| 2562 |
|
|
/* printk("Unloading %s: version %s\n", serial_name, serial_version); */
|
| 2563 |
|
|
if ((e1 = tty_unregister_driver(esp_driver)))
|
| 2564 |
|
|
printk("SERIAL: failed to unregister serial driver (%d)\n",
|
| 2565 |
|
|
e1);
|
| 2566 |
|
|
put_tty_driver(esp_driver);
|
| 2567 |
|
|
|
| 2568 |
|
|
while (ports) {
|
| 2569 |
|
|
if (ports->port) {
|
| 2570 |
|
|
release_region(ports->port, REGION_SIZE);
|
| 2571 |
|
|
}
|
| 2572 |
|
|
temp_async = ports->next_port;
|
| 2573 |
|
|
kfree(ports);
|
| 2574 |
|
|
ports = temp_async;
|
| 2575 |
|
|
}
|
| 2576 |
|
|
|
| 2577 |
|
|
if (dma_buffer)
|
| 2578 |
|
|
free_pages((unsigned long)dma_buffer,
|
| 2579 |
|
|
get_order(DMA_BUFFER_SZ));
|
| 2580 |
|
|
|
| 2581 |
|
|
while (free_pio_buf) {
|
| 2582 |
|
|
pio_buf = free_pio_buf->next;
|
| 2583 |
|
|
kfree(free_pio_buf);
|
| 2584 |
|
|
free_pio_buf = pio_buf;
|
| 2585 |
|
|
}
|
| 2586 |
|
|
}
|
| 2587 |
|
|
|
| 2588 |
|
|
module_init(espserial_init);
|
| 2589 |
|
|
module_exit(espserial_exit);
|
