/*
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/*
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* FILE: mon960_console.c
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* FILE: mon960_console.c
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* AUTHOR: kma
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* AUTHOR: kma
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* DESCR: serial console for TI's 16552 serial controller
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* DESCR: serial console for TI's 16552 serial controller
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*/
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*/
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#ident "$Id: mon960_console.c,v 1.1 2005-12-20 09:42:38 jcastillo Exp $"
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#ident "$Id: mon960_console.c,v 1.1 2005-12-20 09:42:38 jcastillo Exp $"
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#include <linux/tty.h>
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#include <linux/tty.h>
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#include <linux/tty_driver.h>
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#include <linux/tty_driver.h>
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#include <linux/major.h>
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#include <linux/major.h>
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#include <linux/interrupt.h>
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#include <linux/interrupt.h>
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#include <asm/system.h>
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#include <asm/system.h>
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#include <asm/delay.h>
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#include <asm/delay.h>
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#define SER16552_LSR ((volatile unsigned char*)0xe0000014) /* line status */
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#define SER16552_LSR ((volatile unsigned char*)0xe0000014) /* line status */
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#define SER16552_THR ((volatile unsigned char*)0xe0000000) /* send fifo */
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#define SER16552_THR ((volatile unsigned char*)0xe0000000) /* send fifo */
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#define SER16552_RBR ((volatile unsigned char*)0xe0000000) /* rcv fifo */
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#define SER16552_RBR ((volatile unsigned char*)0xe0000000) /* rcv fifo */
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#define SER16552_IER ((volatile unsigned char*)0xe0000004) /* int enable */
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#define SER16552_IER ((volatile unsigned char*)0xe0000004) /* int enable */
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#define LSR_READY 1
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#define LSR_READY 1
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#define LSR_SEND_READY 0x20
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#define LSR_SEND_READY 0x20
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#define LSR_RECEIVE_READY 0x1
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#define LSR_RECEIVE_READY 0x1
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#define LSR_BREAK (1 << 4)
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#define LSR_BREAK (1 << 4)
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#define IER_RCV_ENABLE 1
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#define IER_RCV_ENABLE 1
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#define IER_SEND_ENABLE 2
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#define IER_SEND_ENABLE 2
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static int console_refcount;
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static int console_refcount;
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static struct tty_struct *console_table[1];
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static struct tty_struct *console_table[1];
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static struct termios *console_termios[1];
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static struct termios *console_termios[1];
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static struct termios *console_termios_locked[1];
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static struct termios *console_termios_locked[1];
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static struct tty_driver console_driver;
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static struct tty_driver console_driver;
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/*
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/*
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* The interrupt for the 16552; should only happen for reads
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* The interrupt for the 16552; should only happen for reads
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*/
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*/
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void do_16552_intr(void)
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void do_16552_intr(void)
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{
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{
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unsigned char buf[16];
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unsigned char buf[16];
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int ii;
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int ii;
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struct tty_struct *tty = console_table[0];
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struct tty_struct *tty = console_table[0];
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unsigned long lsr;
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unsigned long lsr;
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/* Drain the fifo into the tty */
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/* Drain the fifo into the tty */
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for (ii=0; (lsr = *SER16552_LSR) & LSR_RECEIVE_READY; ii++) {
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for (ii=0; (lsr = *SER16552_LSR) & LSR_RECEIVE_READY; ii++) {
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/* If there was a break, enter the debugger */
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/* If there was a break, enter the debugger */
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#ifdef CONFIG_MON960
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#ifdef CONFIG_MON960
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char garbage;
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char garbage;
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if (lsr & LSR_BREAK) {
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if (lsr & LSR_BREAK) {
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extern void system_break(void);
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extern void system_break(void);
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system_break();
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system_break();
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garbage = *SER16552_RBR;
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garbage = *SER16552_RBR;
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ii--;
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ii--;
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}
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}
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else
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else
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#endif
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#endif
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buf[ii] = *SER16552_RBR;
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buf[ii] = *SER16552_RBR;
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}
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}
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if (ii)
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if (ii)
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tty->ldisc.receive_buf(tty, buf, 0, ii);
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tty->ldisc.receive_buf(tty, buf, 0, ii);
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}
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}
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#if 0
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#if 0
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static void do_16552_bh(void)
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static void do_16552_bh(void)
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{
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{
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printk("in 16552 bottom half!\n");
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printk("in 16552 bottom half!\n");
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printk("umm... yeah.\n");
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printk("umm... yeah.\n");
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}
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}
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#endif
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#endif
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static inline void putc_16552(char c, int blocking)
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static inline void putc_16552(char c, int blocking)
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{
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{
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unsigned long flags;
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unsigned long flags;
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save_flags(flags);
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save_flags(flags);
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cli();
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cli();
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top:
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top:
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while (!(*SER16552_LSR & LSR_SEND_READY)) {
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while (!(*SER16552_LSR & LSR_SEND_READY)) {
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udelay(1000);
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udelay(1000);
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}
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}
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*SER16552_THR = c;
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*SER16552_THR = c;
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if (c == '\n') {
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if (c == '\n') {
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c = '\r';
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c = '\r';
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goto top;
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goto top;
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}
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}
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restore_flags(flags);
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restore_flags(flags);
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}
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}
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void console_print_mon960(const char* msg)
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void console_print_mon960(const char* msg)
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{
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{
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long flags;
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long flags;
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char c;
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char c;
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save_flags(flags);
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save_flags(flags);
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cli();
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cli();
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while (c = *msg++)
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while (c = *msg++)
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putc_16552(c, 0);
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putc_16552(c, 0);
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restore_flags(flags);
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restore_flags(flags);
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}
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}
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/*
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/*
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* XXX: make this interrupt driven if it's coming from the user
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* XXX: make this interrupt driven if it's coming from the user
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*/
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*/
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static int con_write(struct tty_struct* tty, int from_user,
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static int con_write(struct tty_struct* tty, int from_user,
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const unsigned char* buf, int count)
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const unsigned char* buf, int count)
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{
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{
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int ii = count;
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int ii = count;
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while (ii--)
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while (ii--)
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putc_16552(*buf++, from_user);
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putc_16552(*buf++, from_user);
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return count;
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return count;
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}
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}
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static int con_chars_in_buffer(struct tty_struct *tty)
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static int con_chars_in_buffer(struct tty_struct *tty)
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{
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{
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return 0; /* we're not buffering */
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return 0; /* we're not buffering */
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}
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}
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static int con_writeroom(struct tty_struct *tty)
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static int con_writeroom(struct tty_struct *tty)
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{
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{
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return 8192; /* could return anything */
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return 8192; /* could return anything */
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}
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}
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static void con_putchar(struct tty_struct* tty, unsigned char c)
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static void con_putchar(struct tty_struct* tty, unsigned char c)
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{
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{
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putc_16552(c, 0);
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putc_16552(c, 0);
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}
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}
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static int con_open(struct tty_struct* tty, struct file* filp)
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static int con_open(struct tty_struct* tty, struct file* filp)
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{
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{
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return 0;
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return 0;
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}
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}
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/*
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/*
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* register our tty driver
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* register our tty driver
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*/
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*/
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void mon960_console_init(void)
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void mon960_console_init(void)
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{
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{
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memset(&console_driver, 0, sizeof(console_driver));
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memset(&console_driver, 0, sizeof(console_driver));
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console_driver.magic = TTY_DRIVER_MAGIC;
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console_driver.magic = TTY_DRIVER_MAGIC;
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console_driver.name = "tty";
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console_driver.name = "tty";
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console_driver.name_base = 1;
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console_driver.name_base = 1;
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console_driver.major = TTY_MAJOR;
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console_driver.major = TTY_MAJOR;
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console_driver.minor_start = 1;
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console_driver.minor_start = 1;
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console_driver.num = 1;
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console_driver.num = 1;
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console_driver.type = TTY_DRIVER_TYPE_SERIAL;
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console_driver.type = TTY_DRIVER_TYPE_SERIAL;
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console_driver.init_termios = tty_std_termios;
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console_driver.init_termios = tty_std_termios;
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console_driver.init_termios.c_lflag |= ISIG | ICANON | ECHO
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console_driver.init_termios.c_lflag |= ISIG | ICANON | ECHO
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| ECHOE | ECHOK ;
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| ECHOE | ECHOK ;
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console_driver.init_termios.c_iflag |= ICRNL;
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console_driver.init_termios.c_iflag |= ICRNL;
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console_driver.init_termios.c_cflag = CS8 | CREAD | CLOCAL;
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console_driver.init_termios.c_cflag = CS8 | CREAD | CLOCAL;
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console_driver.flags = TTY_DRIVER_REAL_RAW;
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console_driver.flags = TTY_DRIVER_REAL_RAW;
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console_driver.refcount = &console_refcount;
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console_driver.refcount = &console_refcount;
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console_driver.table = console_table;
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console_driver.table = console_table;
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console_driver.termios = console_termios;
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console_driver.termios = console_termios;
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console_driver.termios_locked = console_termios_locked;
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console_driver.termios_locked = console_termios_locked;
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console_driver.open = con_open;
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console_driver.open = con_open;
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console_driver.write = con_write;
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console_driver.write = con_write;
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console_driver.put_char = con_putchar;
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console_driver.put_char = con_putchar;
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console_driver.write_room = con_writeroom;
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console_driver.write_room = con_writeroom;
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console_driver.chars_in_buffer = con_chars_in_buffer;
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console_driver.chars_in_buffer = con_chars_in_buffer;
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if (tty_register_driver(&console_driver)) {
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if (tty_register_driver(&console_driver)) {
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printk("Couldn't register console driver\n");
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printk("Couldn't register console driver\n");
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}
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}
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/*
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/*
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* Enable receive interrupts
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* Enable receive interrupts
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*/
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*/
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*SER16552_IER = IER_RCV_ENABLE;
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*SER16552_IER = IER_RCV_ENABLE;
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}
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}
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