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1275 |
phoenix |
/*
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* Device driver for the via ADB on (many) Mac II-class machines
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*
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* Based on the original ADB keyboard handler Copyright (c) 1997 Alan Cox
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* Also derived from code Copyright (C) 1996 Paul Mackerras.
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*
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* With various updates provided over the years by Michael Schmitz,
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* Guideo Koerber and others.
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*
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* Rewrite for Unified ADB by Joshua M. Thompson (funaho@jurai.org)
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*
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* 1999-08-02 (jmt) - Initial rewrite for Unified ADB.
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* 2000-03-29 Tony Mantler <tonym@mac.linux-m68k.org>
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* - Big overhaul, should actually work now.
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*/
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#include <stdarg.h>
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/sched.h>
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#include <linux/adb.h>
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#include <linux/init.h>
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#include <asm/macintosh.h>
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#include <asm/macints.h>
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#include <asm/machw.h>
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#include <asm/mac_via.h>
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#include <asm/io.h>
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#include <asm/system.h>
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static volatile unsigned char *via;
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/* VIA registers - spaced 0x200 bytes apart */
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#define RS 0x200 /* skip between registers */
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#define B 0 /* B-side data */
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#define A RS /* A-side data */
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#define DIRB (2*RS) /* B-side direction (1=output) */
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#define DIRA (3*RS) /* A-side direction (1=output) */
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#define T1CL (4*RS) /* Timer 1 ctr/latch (low 8 bits) */
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#define T1CH (5*RS) /* Timer 1 counter (high 8 bits) */
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#define T1LL (6*RS) /* Timer 1 latch (low 8 bits) */
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#define T1LH (7*RS) /* Timer 1 latch (high 8 bits) */
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#define T2CL (8*RS) /* Timer 2 ctr/latch (low 8 bits) */
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#define T2CH (9*RS) /* Timer 2 counter (high 8 bits) */
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#define SR (10*RS) /* Shift register */
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#define ACR (11*RS) /* Auxiliary control register */
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#define PCR (12*RS) /* Peripheral control register */
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#define IFR (13*RS) /* Interrupt flag register */
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#define IER (14*RS) /* Interrupt enable register */
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#define ANH (15*RS) /* A-side data, no handshake */
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/* Bits in B data register: all active low */
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#define TREQ 0x08 /* Transfer request (input) */
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#define TACK 0x10 /* Transfer acknowledge (output) */
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#define TIP 0x20 /* Transfer in progress (output) */
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#define ST_MASK 0x30 /* mask for selecting ADB state bits */
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/* Bits in ACR */
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#define SR_CTRL 0x1c /* Shift register control bits */
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#define SR_EXT 0x0c /* Shift on external clock */
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#define SR_OUT 0x10 /* Shift out if 1 */
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/* Bits in IFR and IER */
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#define IER_SET 0x80 /* set bits in IER */
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#define IER_CLR 0 /* clear bits in IER */
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#define SR_INT 0x04 /* Shift register full/empty */
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#define SR_DATA 0x08 /* Shift register data */
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#define SR_CLOCK 0x10 /* Shift register clock */
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/* ADB transaction states according to GMHW */
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#define ST_CMD 0x00 /* ADB state: command byte */
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#define ST_EVEN 0x10 /* ADB state: even data byte */
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#define ST_ODD 0x20 /* ADB state: odd data byte */
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#define ST_IDLE 0x30 /* ADB state: idle, nothing to send */
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static int macii_init_via(void);
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static void macii_start(void);
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static void macii_interrupt(int irq, void *arg, struct pt_regs *regs);
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static void macii_retransmit(int);
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static void macii_queue_poll(void);
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static int macii_probe(void);
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static int macii_init(void);
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static int macii_send_request(struct adb_request *req, int sync);
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static int macii_write(struct adb_request *req);
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static int macii_autopoll(int devs);
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static void macii_poll(void);
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static int macii_reset_bus(void);
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struct adb_driver via_macii_driver = {
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"Mac II",
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macii_probe,
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macii_init,
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macii_send_request,
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macii_autopoll,
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macii_poll,
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macii_reset_bus
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};
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static enum macii_state {
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idle,
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sending,
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reading,
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read_done,
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awaiting_reply
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} macii_state;
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static int need_poll = 0;
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static int command_byte = 0;
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static int last_reply = 0;
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static int last_active = 0;
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static struct adb_request *current_req;
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static struct adb_request *last_req;
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static struct adb_request *retry_req;
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static unsigned char reply_buf[16];
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static unsigned char *reply_ptr;
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static int reply_len;
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static int reading_reply;
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static int data_index;
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static int first_byte;
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static int prefix_len;
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static int status = ST_IDLE|TREQ;
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static int last_status;
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static int driver_running = 0;
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/* debug level 10 required for ADB logging (should be && debug_adb, ideally) */
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/* Check for MacII style ADB */
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static int macii_probe(void)
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{
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if (macintosh_config->adb_type != MAC_ADB_II) return -ENODEV;
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via = via1;
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printk("adb: Mac II ADB Driver v1.0 for Unified ADB\n");
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return 0;
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}
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/* Initialize the driver */
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int macii_init(void)
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{
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unsigned long flags;
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int err;
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save_flags(flags);
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cli();
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err = macii_init_via();
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if (err) return err;
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err = request_irq(IRQ_MAC_ADB, macii_interrupt, IRQ_FLG_LOCK, "ADB",
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macii_interrupt);
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if (err) return err;
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macii_state = idle;
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restore_flags(flags);
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return 0;
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}
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/* initialize the hardware */
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static int macii_init_via(void)
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{
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unsigned char x;
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/* Set the lines up. We want TREQ as input TACK|TIP as output */
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via[DIRB] = (via[DIRB] | TACK | TIP) & ~TREQ;
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/* Set up state: idle */
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via[B] |= ST_IDLE;
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last_status = via[B] & (ST_MASK|TREQ);
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/* Shift register on input */
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via[ACR] = (via[ACR] & ~SR_CTRL) | SR_EXT;
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/* Wipe any pending data and int */
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x = via[SR];
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return 0;
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}
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/* Send an ADB poll (Talk Register 0 command, tagged on the front of the request queue) */
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static void macii_queue_poll(void)
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{
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static int device = 0;
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static int in_poll=0;
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static struct adb_request req;
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unsigned long flags;
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if (in_poll) printk("macii_queue_poll: double poll!\n");
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in_poll++;
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if (++device > 15) device = 1;
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adb_request(&req, NULL, ADBREQ_REPLY|ADBREQ_NOSEND, 1,
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ADB_READREG(device, 0));
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save_flags(flags);
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cli();
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req.next = current_req;
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current_req = &req;
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restore_flags(flags);
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macii_start();
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in_poll--;
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}
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/* Send an ADB retransmit (Talk, appended to the request queue) */
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static void macii_retransmit(int device)
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{
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static int in_retransmit = 0;
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static struct adb_request rt;
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unsigned long flags;
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if (in_retransmit) printk("macii_retransmit: double retransmit!\n");
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in_retransmit++;
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adb_request(&rt, NULL, ADBREQ_REPLY|ADBREQ_NOSEND, 1,
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ADB_READREG(device, 0));
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save_flags(flags);
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cli();
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if (current_req != NULL) {
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last_req->next = &rt;
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last_req = &rt;
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} else {
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current_req = &rt;
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last_req = &rt;
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}
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if (macii_state == idle) macii_start();
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restore_flags(flags);
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in_retransmit--;
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}
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| 241 |
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/* Send an ADB request; if sync, poll out the reply 'till it's done */
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static int macii_send_request(struct adb_request *req, int sync)
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{
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int i;
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| 246 |
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i = macii_write(req);
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if (i) return i;
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| 249 |
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if (sync) {
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while (!req->complete) macii_poll();
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}
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return 0;
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}
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| 255 |
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/* Send an ADB request */
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static int macii_write(struct adb_request *req)
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{
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unsigned long flags;
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if (req->nbytes < 2 || req->data[0] != ADB_PACKET || req->nbytes > 15) {
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req->complete = 1;
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return -EINVAL;
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| 263 |
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}
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| 264 |
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| 265 |
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req->next = 0;
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req->sent = 0;
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req->complete = 0;
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req->reply_len = 0;
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save_flags(flags); cli();
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| 272 |
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if (current_req != NULL) {
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last_req->next = req;
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last_req = req;
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| 275 |
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} else {
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current_req = req;
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| 277 |
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last_req = req;
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| 278 |
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if (macii_state == idle) macii_start();
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| 279 |
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}
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| 280 |
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| 281 |
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restore_flags(flags);
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| 282 |
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return 0;
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| 283 |
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}
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| 284 |
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| 285 |
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/* Start auto-polling */
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| 286 |
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static int macii_autopoll(int devs)
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| 287 |
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{
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| 288 |
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/* Just ping a random default address */
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| 289 |
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if (!(current_req || retry_req))
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| 290 |
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macii_retransmit( (last_active < 16 && last_active > 0) ? last_active : 3);
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| 291 |
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return 0;
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| 292 |
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}
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| 293 |
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| 294 |
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/* Prod the chip without interrupts */
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| 295 |
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static void macii_poll(void)
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| 296 |
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{
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| 297 |
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unsigned long flags;
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| 298 |
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| 299 |
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save_flags(flags); cli();
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| 300 |
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if (via[IFR] & SR_INT) macii_interrupt(0, 0, 0);
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| 301 |
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restore_flags(flags);
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| 302 |
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}
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| 303 |
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| 304 |
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/* Reset the bus */
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| 305 |
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static int macii_reset_bus(void)
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| 306 |
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{
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| 307 |
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static struct adb_request req;
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| 308 |
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| 309 |
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/* Command = 0, Address = ignored */
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| 310 |
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adb_request(&req, NULL, 0, 1, ADB_BUSRESET);
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| 311 |
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| 312 |
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return 0;
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| 313 |
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}
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| 314 |
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| 315 |
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/* Start sending ADB packet */
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| 316 |
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static void macii_start(void)
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| 317 |
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{
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| 318 |
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unsigned long flags;
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| 319 |
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struct adb_request *req;
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| 320 |
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| 321 |
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req = current_req;
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| 322 |
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if (!req) return;
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| 323 |
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| 324 |
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/* assert macii_state == idle */
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| 325 |
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if (macii_state != idle) {
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| 326 |
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printk("macii_start: called while driver busy (%p %x %x)!\n",
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| 327 |
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req, macii_state, (uint) via1[B] & (ST_MASK|TREQ));
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| 328 |
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return;
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| 329 |
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}
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| 330 |
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| 331 |
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save_flags(flags); cli();
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| 332 |
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| 333 |
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/*
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| 334 |
|
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* IRQ signaled ?? (means ADB controller wants to send, or might
|
| 335 |
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* be end of packet if we were reading)
|
| 336 |
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*/
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| 337 |
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#if 0 /* FIXME: This is broke broke broke, for some reason */
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| 338 |
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if ((via[B] & TREQ) == 0) {
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| 339 |
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printk("macii_start: weird poll stuff. huh?\n");
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| 340 |
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/*
|
| 341 |
|
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* FIXME - we need to restart this on a timer
|
| 342 |
|
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* or a collision at boot hangs us.
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| 343 |
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* Never set macii_state to idle here, or macii_start
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| 344 |
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* won't be called again from send_request!
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| 345 |
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* (need to re-check other cases ...)
|
| 346 |
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*/
|
| 347 |
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/*
|
| 348 |
|
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* if the interrupt handler set the need_poll
|
| 349 |
|
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* flag, it's hopefully a SRQ poll or re-Talk
|
| 350 |
|
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* so we try to send here anyway
|
| 351 |
|
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*/
|
| 352 |
|
|
if (!need_poll) {
|
| 353 |
|
|
if (console_loglevel == 10)
|
| 354 |
|
|
printk("macii_start: device busy - retry %p state %d status %x!\n",
|
| 355 |
|
|
req, macii_state,
|
| 356 |
|
|
(uint) via[B] & (ST_MASK|TREQ));
|
| 357 |
|
|
retry_req = req;
|
| 358 |
|
|
/* set ADB status here ? */
|
| 359 |
|
|
restore_flags(flags);
|
| 360 |
|
|
return;
|
| 361 |
|
|
} else {
|
| 362 |
|
|
need_poll = 0;
|
| 363 |
|
|
}
|
| 364 |
|
|
}
|
| 365 |
|
|
#endif
|
| 366 |
|
|
/*
|
| 367 |
|
|
* Another retry pending? (sanity check)
|
| 368 |
|
|
*/
|
| 369 |
|
|
if (retry_req) {
|
| 370 |
|
|
retry_req = NULL;
|
| 371 |
|
|
}
|
| 372 |
|
|
|
| 373 |
|
|
/* Now send it. Be careful though, that first byte of the request */
|
| 374 |
|
|
/* is actually ADB_PACKET; the real data begins at index 1! */
|
| 375 |
|
|
|
| 376 |
|
|
/* store command byte */
|
| 377 |
|
|
command_byte = req->data[1];
|
| 378 |
|
|
/* Output mode */
|
| 379 |
|
|
via[ACR] |= SR_OUT;
|
| 380 |
|
|
/* Load data */
|
| 381 |
|
|
via[SR] = req->data[1];
|
| 382 |
|
|
/* set ADB state to 'command' */
|
| 383 |
|
|
via[B] = (via[B] & ~ST_MASK) | ST_CMD;
|
| 384 |
|
|
|
| 385 |
|
|
macii_state = sending;
|
| 386 |
|
|
data_index = 2;
|
| 387 |
|
|
|
| 388 |
|
|
restore_flags(flags);
|
| 389 |
|
|
}
|
| 390 |
|
|
|
| 391 |
|
|
/*
|
| 392 |
|
|
* The notorious ADB interrupt handler - does all of the protocol handling,
|
| 393 |
|
|
* except for starting new send operations. Relies heavily on the ADB
|
| 394 |
|
|
* controller sending and receiving data, thereby generating SR interrupts
|
| 395 |
|
|
* for us. This means there has to be always activity on the ADB bus, otherwise
|
| 396 |
|
|
* the whole process dies and has to be re-kicked by sending TALK requests ...
|
| 397 |
|
|
* CUDA-based Macs seem to solve this with the autopoll option, for MacII-type
|
| 398 |
|
|
* ADB the problem isn't solved yet (retransmit of the latest active TALK seems
|
| 399 |
|
|
* a good choice; either on timeout or on a timer interrupt).
|
| 400 |
|
|
*
|
| 401 |
|
|
* The basic ADB state machine was left unchanged from the original MacII code
|
| 402 |
|
|
* by Alan Cox, which was based on the CUDA driver for PowerMac.
|
| 403 |
|
|
* The syntax of the ADB status lines seems to be totally different on MacII,
|
| 404 |
|
|
* though. MacII uses the states Command -> Even -> Odd -> Even ->...-> Idle for
|
| 405 |
|
|
* sending, and Idle -> Even -> Odd -> Even ->...-> Idle for receiving. Start
|
| 406 |
|
|
* and end of a receive packet are signaled by asserting /IRQ on the interrupt
|
| 407 |
|
|
* line. Timeouts are signaled by a sequence of 4 0xFF, with /IRQ asserted on
|
| 408 |
|
|
* every other byte. SRQ is probably signaled by 3 or more 0xFF tacked on the
|
| 409 |
|
|
* end of a packet. (Thanks to Guido Koerber for eavesdropping on the ADB
|
| 410 |
|
|
* protocol with a logic analyzer!!)
|
| 411 |
|
|
*
|
| 412 |
|
|
* Note: As of 21/10/97, the MacII ADB part works including timeout detection
|
| 413 |
|
|
* and retransmit (Talk to the last active device).
|
| 414 |
|
|
*/
|
| 415 |
|
|
void macii_interrupt(int irq, void *arg, struct pt_regs *regs)
|
| 416 |
|
|
{
|
| 417 |
|
|
int x, adbdir;
|
| 418 |
|
|
unsigned long flags;
|
| 419 |
|
|
struct adb_request *req;
|
| 420 |
|
|
|
| 421 |
|
|
last_status = status;
|
| 422 |
|
|
|
| 423 |
|
|
/* prevent races due to SCSI enabling ints */
|
| 424 |
|
|
save_flags(flags); cli();
|
| 425 |
|
|
|
| 426 |
|
|
if (driver_running) {
|
| 427 |
|
|
restore_flags(flags);
|
| 428 |
|
|
return;
|
| 429 |
|
|
}
|
| 430 |
|
|
|
| 431 |
|
|
driver_running = 1;
|
| 432 |
|
|
|
| 433 |
|
|
status = via[B] & (ST_MASK|TREQ);
|
| 434 |
|
|
adbdir = via[ACR] & SR_OUT;
|
| 435 |
|
|
|
| 436 |
|
|
switch (macii_state) {
|
| 437 |
|
|
case idle:
|
| 438 |
|
|
x = via[SR];
|
| 439 |
|
|
first_byte = x;
|
| 440 |
|
|
/* set ADB state = even for first data byte */
|
| 441 |
|
|
via[B] = (via[B] & ~ST_MASK) | ST_EVEN;
|
| 442 |
|
|
|
| 443 |
|
|
reply_buf[0] = first_byte; /* was command_byte?? */
|
| 444 |
|
|
reply_ptr = reply_buf + 1;
|
| 445 |
|
|
reply_len = 1;
|
| 446 |
|
|
prefix_len = 1;
|
| 447 |
|
|
reading_reply = 0;
|
| 448 |
|
|
|
| 449 |
|
|
macii_state = reading;
|
| 450 |
|
|
break;
|
| 451 |
|
|
|
| 452 |
|
|
case awaiting_reply:
|
| 453 |
|
|
/* handshake etc. for II ?? */
|
| 454 |
|
|
x = via[SR];
|
| 455 |
|
|
first_byte = x;
|
| 456 |
|
|
/* set ADB state = even for first data byte */
|
| 457 |
|
|
via[B] = (via[B] & ~ST_MASK) | ST_EVEN;
|
| 458 |
|
|
|
| 459 |
|
|
current_req->reply[0] = first_byte;
|
| 460 |
|
|
reply_ptr = current_req->reply + 1;
|
| 461 |
|
|
reply_len = 1;
|
| 462 |
|
|
prefix_len = 1;
|
| 463 |
|
|
reading_reply = 1;
|
| 464 |
|
|
|
| 465 |
|
|
macii_state = reading;
|
| 466 |
|
|
break;
|
| 467 |
|
|
|
| 468 |
|
|
case sending:
|
| 469 |
|
|
req = current_req;
|
| 470 |
|
|
if (data_index >= req->nbytes) {
|
| 471 |
|
|
/* print an error message if a listen command has no data */
|
| 472 |
|
|
if (((command_byte & 0x0C) == 0x08)
|
| 473 |
|
|
/* && (console_loglevel == 10) */
|
| 474 |
|
|
&& (data_index == 2))
|
| 475 |
|
|
printk("MacII ADB: listen command with no data: %x!\n",
|
| 476 |
|
|
command_byte);
|
| 477 |
|
|
/* reset to shift in */
|
| 478 |
|
|
via[ACR] &= ~SR_OUT;
|
| 479 |
|
|
x = via[SR];
|
| 480 |
|
|
/* set ADB state idle - might get SRQ */
|
| 481 |
|
|
via[B] = (via[B] & ~ST_MASK) | ST_IDLE;
|
| 482 |
|
|
|
| 483 |
|
|
req->sent = 1;
|
| 484 |
|
|
|
| 485 |
|
|
if (req->reply_expected) {
|
| 486 |
|
|
macii_state = awaiting_reply;
|
| 487 |
|
|
} else {
|
| 488 |
|
|
req->complete = 1;
|
| 489 |
|
|
current_req = req->next;
|
| 490 |
|
|
if (req->done) (*req->done)(req);
|
| 491 |
|
|
macii_state = idle;
|
| 492 |
|
|
if (current_req || retry_req)
|
| 493 |
|
|
macii_start();
|
| 494 |
|
|
else
|
| 495 |
|
|
macii_retransmit((command_byte & 0xF0) >> 4);
|
| 496 |
|
|
}
|
| 497 |
|
|
} else {
|
| 498 |
|
|
via[SR] = req->data[data_index++];
|
| 499 |
|
|
|
| 500 |
|
|
if ( (via[B] & ST_MASK) == ST_CMD ) {
|
| 501 |
|
|
/* just sent the command byte, set to EVEN */
|
| 502 |
|
|
via[B] = (via[B] & ~ST_MASK) | ST_EVEN;
|
| 503 |
|
|
} else {
|
| 504 |
|
|
/* invert state bits, toggle ODD/EVEN */
|
| 505 |
|
|
via[B] ^= ST_MASK;
|
| 506 |
|
|
}
|
| 507 |
|
|
}
|
| 508 |
|
|
break;
|
| 509 |
|
|
|
| 510 |
|
|
case reading:
|
| 511 |
|
|
|
| 512 |
|
|
/* timeout / SRQ handling for II hw */
|
| 513 |
|
|
if( (first_byte == 0xFF && (reply_len-prefix_len)==2
|
| 514 |
|
|
&& memcmp(reply_ptr-2,"\xFF\xFF",2)==0) ||
|
| 515 |
|
|
((reply_len-prefix_len)==3
|
| 516 |
|
|
&& memcmp(reply_ptr-3,"\xFF\xFF\xFF",3)==0))
|
| 517 |
|
|
{
|
| 518 |
|
|
/*
|
| 519 |
|
|
* possible timeout (in fact, most probably a
|
| 520 |
|
|
* timeout, since SRQ can't be signaled without
|
| 521 |
|
|
* transfer on the bus).
|
| 522 |
|
|
* The last three bytes seen were FF, together
|
| 523 |
|
|
* with the starting byte (in case we started
|
| 524 |
|
|
* on 'idle' or 'awaiting_reply') this probably
|
| 525 |
|
|
* makes four. So this is mostl likely #5!
|
| 526 |
|
|
* The timeout signal is a pattern 1 0 1 0 0..
|
| 527 |
|
|
* on /INT, meaning we missed it :-(
|
| 528 |
|
|
*/
|
| 529 |
|
|
x = via[SR];
|
| 530 |
|
|
if (x != 0xFF) printk("MacII ADB: mistaken timeout/SRQ!\n");
|
| 531 |
|
|
|
| 532 |
|
|
if ((status & TREQ) == (last_status & TREQ)) {
|
| 533 |
|
|
/* Not a timeout. Unsolicited SRQ? weird. */
|
| 534 |
|
|
/* Terminate the SRQ packet and poll */
|
| 535 |
|
|
need_poll = 1;
|
| 536 |
|
|
}
|
| 537 |
|
|
/* There's no packet to get, so reply is blank */
|
| 538 |
|
|
via[B] ^= ST_MASK;
|
| 539 |
|
|
reply_ptr -= (reply_len-prefix_len);
|
| 540 |
|
|
reply_len = prefix_len;
|
| 541 |
|
|
macii_state = read_done;
|
| 542 |
|
|
break;
|
| 543 |
|
|
} /* end timeout / SRQ handling for II hw. */
|
| 544 |
|
|
|
| 545 |
|
|
if((reply_len-prefix_len)>3
|
| 546 |
|
|
&& memcmp(reply_ptr-3,"\xFF\xFF\xFF",3)==0)
|
| 547 |
|
|
{
|
| 548 |
|
|
/* SRQ tacked on data packet */
|
| 549 |
|
|
/* Terminate the packet (SRQ never ends) */
|
| 550 |
|
|
x = via[SR];
|
| 551 |
|
|
macii_state = read_done;
|
| 552 |
|
|
reply_len -= 3;
|
| 553 |
|
|
reply_ptr -= 3;
|
| 554 |
|
|
need_poll = 1;
|
| 555 |
|
|
/* need to continue; next byte not seen else */
|
| 556 |
|
|
} else {
|
| 557 |
|
|
/* Sanity check */
|
| 558 |
|
|
if (reply_len > 15) reply_len = 0;
|
| 559 |
|
|
/* read byte */
|
| 560 |
|
|
x = via[SR];
|
| 561 |
|
|
*reply_ptr = x;
|
| 562 |
|
|
reply_ptr++;
|
| 563 |
|
|
reply_len++;
|
| 564 |
|
|
}
|
| 565 |
|
|
/* The usual handshake ... */
|
| 566 |
|
|
|
| 567 |
|
|
/*
|
| 568 |
|
|
* NetBSD hints that the next to last byte
|
| 569 |
|
|
* is sent with IRQ !!
|
| 570 |
|
|
* Guido found out it's the last one (0x0),
|
| 571 |
|
|
* but IRQ should be asserted already.
|
| 572 |
|
|
* Problem with timeout detection: First
|
| 573 |
|
|
* transition to /IRQ might be second
|
| 574 |
|
|
* byte of timeout packet!
|
| 575 |
|
|
* Timeouts are signaled by 4x FF.
|
| 576 |
|
|
*/
|
| 577 |
|
|
if (((status & TREQ) == 0) && (x == 0x00)) { /* != 0xFF */
|
| 578 |
|
|
/* invert state bits, toggle ODD/EVEN */
|
| 579 |
|
|
via[B] ^= ST_MASK;
|
| 580 |
|
|
|
| 581 |
|
|
/* adjust packet length */
|
| 582 |
|
|
reply_len--;
|
| 583 |
|
|
reply_ptr--;
|
| 584 |
|
|
macii_state = read_done;
|
| 585 |
|
|
} else {
|
| 586 |
|
|
/* not caught: ST_CMD */
|
| 587 |
|
|
/* required for re-entry 'reading'! */
|
| 588 |
|
|
if ((status & ST_MASK) == ST_IDLE) {
|
| 589 |
|
|
/* (in)sanity check - set even */
|
| 590 |
|
|
via[B] = (via[B] & ~ST_MASK) | ST_EVEN;
|
| 591 |
|
|
} else {
|
| 592 |
|
|
/* invert state bits */
|
| 593 |
|
|
via[B] ^= ST_MASK;
|
| 594 |
|
|
}
|
| 595 |
|
|
}
|
| 596 |
|
|
break;
|
| 597 |
|
|
|
| 598 |
|
|
case read_done:
|
| 599 |
|
|
x = via[SR];
|
| 600 |
|
|
if (reading_reply) {
|
| 601 |
|
|
req = current_req;
|
| 602 |
|
|
req->reply_len = reply_ptr - req->reply;
|
| 603 |
|
|
req->complete = 1;
|
| 604 |
|
|
current_req = req->next;
|
| 605 |
|
|
if (req->done) (*req->done)(req);
|
| 606 |
|
|
} else {
|
| 607 |
|
|
adb_input(reply_buf, reply_ptr - reply_buf,
|
| 608 |
|
|
regs, 0);
|
| 609 |
|
|
}
|
| 610 |
|
|
|
| 611 |
|
|
/*
|
| 612 |
|
|
* remember this device ID; it's the latest we got a
|
| 613 |
|
|
* reply from!
|
| 614 |
|
|
*/
|
| 615 |
|
|
last_reply = command_byte;
|
| 616 |
|
|
last_active = (command_byte & 0xF0) >> 4;
|
| 617 |
|
|
|
| 618 |
|
|
/* SRQ seen before, initiate poll now */
|
| 619 |
|
|
if (need_poll) {
|
| 620 |
|
|
macii_state = idle;
|
| 621 |
|
|
macii_queue_poll();
|
| 622 |
|
|
need_poll = 0;
|
| 623 |
|
|
break;
|
| 624 |
|
|
}
|
| 625 |
|
|
|
| 626 |
|
|
/* set ADB state to idle */
|
| 627 |
|
|
via[B] = (via[B] & ~ST_MASK) | ST_IDLE;
|
| 628 |
|
|
|
| 629 |
|
|
/* /IRQ seen, so the ADB controller has data for us */
|
| 630 |
|
|
if ((via[B] & TREQ) != 0) {
|
| 631 |
|
|
macii_state = reading;
|
| 632 |
|
|
|
| 633 |
|
|
reply_buf[0] = command_byte;
|
| 634 |
|
|
reply_ptr = reply_buf + 1;
|
| 635 |
|
|
reply_len = 1;
|
| 636 |
|
|
prefix_len = 1;
|
| 637 |
|
|
reading_reply = 0;
|
| 638 |
|
|
} else {
|
| 639 |
|
|
/* no IRQ, send next packet or wait */
|
| 640 |
|
|
macii_state = idle;
|
| 641 |
|
|
if (current_req)
|
| 642 |
|
|
macii_start();
|
| 643 |
|
|
else
|
| 644 |
|
|
macii_retransmit(last_active);
|
| 645 |
|
|
}
|
| 646 |
|
|
break;
|
| 647 |
|
|
|
| 648 |
|
|
default:
|
| 649 |
|
|
break;
|
| 650 |
|
|
}
|
| 651 |
|
|
/* reset mutex and interrupts */
|
| 652 |
|
|
driver_running = 0;
|
| 653 |
|
|
restore_flags(flags);
|
| 654 |
|
|
}
|
