678 lines
15 KiB
C
678 lines
15 KiB
C
/*
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* Device driver for the IIsi-style ADB on some Mac LC and II-class machines
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*
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* Based on via-cuda.c and via-macii.c, as well as the original
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* adb-bus.c, which in turn is somewhat influenced by (but uses no
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* code from) the NetBSD HWDIRECT ADB code. Original IIsi driver work
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* was done by Robert Thompson and integrated into the old style
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* driver by Michael Schmitz.
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*
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* Original sources (c) Alan Cox, Paul Mackerras, and others.
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*
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* Rewritten for Unified ADB by David Huggins-Daines <dhd@debian.org>
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*
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* 7/13/2000- extensive changes by Andrew McPherson <andrew@macduff.dhs.org>
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* Works about 30% of the time now.
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*/
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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/adb.h>
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#include <linux/cuda.h>
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <asm/macintosh.h>
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#include <asm/macints.h>
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#include <asm/mac_via.h>
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static volatile unsigned char *via;
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/* VIA registers - spaced 0x200 bytes apart - only the ones we actually use */
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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 SR (10*RS) /* Shift register */
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#define ACR (11*RS) /* Auxiliary 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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/* 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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#define ADB_DELAY 150
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#undef DEBUG_MACIISI_ADB
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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 unsigned char maciisi_rbuf[16];
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static unsigned char *reply_ptr;
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static int data_index;
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static int reading_reply;
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static int reply_len;
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static int tmp;
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static int need_sync;
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static enum maciisi_state {
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idle,
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sending,
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reading,
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} maciisi_state;
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static int maciisi_probe(void);
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static int maciisi_init(void);
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static int maciisi_send_request(struct adb_request* req, int sync);
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static void maciisi_sync(struct adb_request *req);
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static int maciisi_write(struct adb_request* req);
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static irqreturn_t maciisi_interrupt(int irq, void* arg);
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static void maciisi_input(unsigned char *buf, int nb);
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static int maciisi_init_via(void);
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static void maciisi_poll(void);
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static int maciisi_start(void);
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struct adb_driver via_maciisi_driver = {
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"Mac IIsi",
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maciisi_probe,
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maciisi_init,
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maciisi_send_request,
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NULL, /* maciisi_adb_autopoll, */
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maciisi_poll,
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NULL /* maciisi_reset_adb_bus */
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};
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static int
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maciisi_probe(void)
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{
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if (macintosh_config->adb_type != MAC_ADB_IISI)
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return -ENODEV;
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via = via1;
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return 0;
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}
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static int
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maciisi_init(void)
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{
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int err;
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if (via == NULL)
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return -ENODEV;
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if ((err = maciisi_init_via())) {
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printk(KERN_ERR "maciisi_init: maciisi_init_via() failed, code %d\n", err);
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via = NULL;
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return err;
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}
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if (request_irq(IRQ_MAC_ADB, maciisi_interrupt, 0, "ADB",
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maciisi_interrupt)) {
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printk(KERN_ERR "maciisi_init: can't get irq %d\n", IRQ_MAC_ADB);
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return -EAGAIN;
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}
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printk("adb: Mac IIsi driver v0.2 for Unified ADB.\n");
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return 0;
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}
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/* Flush data from the ADB controller */
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static void
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maciisi_stfu(void)
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{
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int status = via[B] & (TIP|TREQ);
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if (status & TREQ) {
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#ifdef DEBUG_MACIISI_ADB
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printk (KERN_DEBUG "maciisi_stfu called with TREQ high!\n");
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#endif
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return;
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}
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udelay(ADB_DELAY);
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via[ACR] &= ~SR_OUT;
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via[IER] = IER_CLR | SR_INT;
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udelay(ADB_DELAY);
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status = via[B] & (TIP|TREQ);
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if (!(status & TREQ))
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{
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via[B] |= TIP;
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while(1)
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{
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int poll_timeout = ADB_DELAY * 5;
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/* Poll for SR interrupt */
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while (!(via[IFR] & SR_INT) && poll_timeout-- > 0)
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status = via[B] & (TIP|TREQ);
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tmp = via[SR]; /* Clear shift register */
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#ifdef DEBUG_MACIISI_ADB
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printk(KERN_DEBUG "maciisi_stfu: status %x timeout %d data %x\n",
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status, poll_timeout, tmp);
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#endif
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if(via[B] & TREQ)
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break;
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/* ACK on-off */
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via[B] |= TACK;
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udelay(ADB_DELAY);
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via[B] &= ~TACK;
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}
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/* end frame */
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via[B] &= ~TIP;
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udelay(ADB_DELAY);
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}
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via[IER] = IER_SET | SR_INT;
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}
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/* All specifically VIA-related initialization goes here */
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static int
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maciisi_init_via(void)
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{
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int i;
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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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/* Shift register on input */
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via[ACR] = (via[ACR] & ~SR_CTRL) | SR_EXT;
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#ifdef DEBUG_MACIISI_ADB
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printk(KERN_DEBUG "maciisi_init_via: initial status %x\n", via[B] & (TIP|TREQ));
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#endif
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/* Wipe any pending data and int */
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tmp = via[SR];
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/* Enable keyboard interrupts */
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via[IER] = IER_SET | SR_INT;
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/* Set initial state: idle */
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via[B] &= ~(TACK|TIP);
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/* Clear interrupt bit */
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via[IFR] = SR_INT;
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for(i = 0; i < 60; i++) {
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udelay(ADB_DELAY);
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maciisi_stfu();
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udelay(ADB_DELAY);
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if(via[B] & TREQ)
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break;
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}
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if (i == 60)
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printk(KERN_ERR "maciisi_init_via: bus jam?\n");
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maciisi_state = idle;
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need_sync = 0;
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return 0;
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}
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/* Send a request, possibly waiting for a reply */
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static int
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maciisi_send_request(struct adb_request* req, int sync)
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{
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int i;
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#ifdef DEBUG_MACIISI_ADB
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static int dump_packet = 0;
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#endif
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if (via == NULL) {
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req->complete = 1;
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return -ENXIO;
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}
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#ifdef DEBUG_MACIISI_ADB
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if (dump_packet) {
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printk(KERN_DEBUG "maciisi_send_request:");
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for (i = 0; i < req->nbytes; i++) {
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printk(" %.2x", req->data[i]);
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}
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printk(" sync %d\n", sync);
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}
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#endif
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req->reply_expected = 1;
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i = maciisi_write(req);
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if (i)
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{
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/* Normally, if a packet requires syncing, that happens at the end of
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* maciisi_send_request. But if the transfer fails, it will be restarted
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* by maciisi_interrupt(). We use need_sync to tell maciisi_interrupt
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* when to sync a packet that it sends out.
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*
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* Suggestions on a better way to do this are welcome.
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*/
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if(i == -EBUSY && sync)
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need_sync = 1;
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else
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need_sync = 0;
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return i;
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}
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if(sync)
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maciisi_sync(req);
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return 0;
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}
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/* Poll the ADB chip until the request completes */
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static void maciisi_sync(struct adb_request *req)
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{
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int count = 0;
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#ifdef DEBUG_MACIISI_ADB
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printk(KERN_DEBUG "maciisi_sync called\n");
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#endif
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/* If for some reason the ADB chip shuts up on us, we want to avoid an endless loop. */
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while (!req->complete && count++ < 50) {
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maciisi_poll();
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}
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/* This could be BAD... when the ADB controller doesn't respond
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* for this long, it's probably not coming back :-( */
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if (count > 50) /* Hopefully shouldn't happen */
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printk(KERN_ERR "maciisi_send_request: poll timed out!\n");
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}
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int
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maciisi_request(struct adb_request *req, void (*done)(struct adb_request *),
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int nbytes, ...)
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{
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va_list list;
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int i;
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req->nbytes = nbytes;
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req->done = done;
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req->reply_expected = 0;
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va_start(list, nbytes);
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for (i = 0; i < nbytes; i++)
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req->data[i++] = va_arg(list, int);
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va_end(list);
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return maciisi_send_request(req, 1);
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}
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/* Enqueue a request, and run the queue if possible */
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static int
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maciisi_write(struct adb_request* req)
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{
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unsigned long flags;
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int i;
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/* We will accept CUDA packets - the VIA sends them to us, so
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it figures that we should be able to send them to it */
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if (req->nbytes < 2 || req->data[0] > CUDA_PACKET) {
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printk(KERN_ERR "maciisi_write: packet too small or not an ADB or CUDA packet\n");
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req->complete = 1;
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return -EINVAL;
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}
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req->next = NULL;
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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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local_irq_save(flags);
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if (current_req) {
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last_req->next = req;
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last_req = req;
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} else {
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current_req = req;
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last_req = req;
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}
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if (maciisi_state == idle)
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{
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i = maciisi_start();
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if(i != 0)
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{
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local_irq_restore(flags);
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return i;
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}
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}
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else
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{
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#ifdef DEBUG_MACIISI_ADB
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printk(KERN_DEBUG "maciisi_write: would start, but state is %d\n", maciisi_state);
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#endif
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local_irq_restore(flags);
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return -EBUSY;
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}
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local_irq_restore(flags);
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return 0;
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}
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static int
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maciisi_start(void)
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{
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struct adb_request* req;
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int status;
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#ifdef DEBUG_MACIISI_ADB
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status = via[B] & (TIP | TREQ);
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printk(KERN_DEBUG "maciisi_start called, state=%d, status=%x, ifr=%x\n", maciisi_state, status, via[IFR]);
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#endif
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if (maciisi_state != idle) {
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/* shouldn't happen */
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printk(KERN_ERR "maciisi_start: maciisi_start called when driver busy!\n");
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return -EBUSY;
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}
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req = current_req;
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if (req == NULL)
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return -EINVAL;
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status = via[B] & (TIP|TREQ);
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if (!(status & TREQ)) {
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#ifdef DEBUG_MACIISI_ADB
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printk(KERN_DEBUG "maciisi_start: bus busy - aborting\n");
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#endif
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return -EBUSY;
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}
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/* Okay, send */
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#ifdef DEBUG_MACIISI_ADB
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printk(KERN_DEBUG "maciisi_start: sending\n");
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#endif
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/* Set state to active */
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via[B] |= TIP;
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/* ACK off */
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via[B] &= ~TACK;
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/* Delay */
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udelay(ADB_DELAY);
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/* Shift out and send */
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via[ACR] |= SR_OUT;
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via[SR] = req->data[0];
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data_index = 1;
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/* ACK on */
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via[B] |= TACK;
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maciisi_state = sending;
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return 0;
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}
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void
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maciisi_poll(void)
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{
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unsigned long flags;
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local_irq_save(flags);
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if (via[IFR] & SR_INT) {
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maciisi_interrupt(0, NULL);
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}
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else /* avoid calling this function too quickly in a loop */
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udelay(ADB_DELAY);
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local_irq_restore(flags);
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}
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/* Shift register interrupt - this is *supposed* to mean that the
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register is either full or empty. In practice, I have no idea what
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it means :( */
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static irqreturn_t
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maciisi_interrupt(int irq, void* arg)
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{
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int status;
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struct adb_request *req;
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#ifdef DEBUG_MACIISI_ADB
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static int dump_reply = 0;
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#endif
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int i;
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unsigned long flags;
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local_irq_save(flags);
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status = via[B] & (TIP|TREQ);
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#ifdef DEBUG_MACIISI_ADB
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printk(KERN_DEBUG "state %d status %x ifr %x\n", maciisi_state, status, via[IFR]);
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#endif
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if (!(via[IFR] & SR_INT)) {
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/* Shouldn't happen, we hope */
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printk(KERN_ERR "maciisi_interrupt: called without interrupt flag set\n");
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local_irq_restore(flags);
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return IRQ_NONE;
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}
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/* Clear the interrupt */
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/* via[IFR] = SR_INT; */
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switch_start:
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switch (maciisi_state) {
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case idle:
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if (status & TIP)
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printk(KERN_ERR "maciisi_interrupt: state is idle but TIP asserted!\n");
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if(!reading_reply)
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udelay(ADB_DELAY);
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/* Shift in */
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via[ACR] &= ~SR_OUT;
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/* Signal start of frame */
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via[B] |= TIP;
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/* Clear the interrupt (throw this value on the floor, it's useless) */
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tmp = via[SR];
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/* ACK adb chip, high-low */
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via[B] |= TACK;
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udelay(ADB_DELAY);
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via[B] &= ~TACK;
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reply_len = 0;
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maciisi_state = reading;
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if (reading_reply) {
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reply_ptr = current_req->reply;
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} else {
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reply_ptr = maciisi_rbuf;
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}
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break;
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case sending:
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/* via[SR]; */
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/* Set ACK off */
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via[B] &= ~TACK;
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req = current_req;
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if (!(status & TREQ)) {
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/* collision */
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printk(KERN_ERR "maciisi_interrupt: send collision\n");
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/* Set idle and input */
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via[ACR] &= ~SR_OUT;
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tmp = via[SR];
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via[B] &= ~TIP;
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/* Must re-send */
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reading_reply = 0;
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reply_len = 0;
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maciisi_state = idle;
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udelay(ADB_DELAY);
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/* process this now, because the IFR has been cleared */
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goto switch_start;
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}
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udelay(ADB_DELAY);
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if (data_index >= req->nbytes) {
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/* Sent the whole packet, put the bus back in idle state */
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/* Shift in, we are about to read a reply (hopefully) */
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via[ACR] &= ~SR_OUT;
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tmp = via[SR];
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/* End of frame */
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via[B] &= ~TIP;
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req->sent = 1;
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maciisi_state = idle;
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if (req->reply_expected) {
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/* Note: only set this once we've
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successfully sent the packet */
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reading_reply = 1;
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} else {
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current_req = req->next;
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if (req->done)
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(*req->done)(req);
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/* Do any queued requests now */
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i = maciisi_start();
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if(i == 0 && need_sync) {
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/* Packet needs to be synced */
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maciisi_sync(current_req);
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}
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if(i != -EBUSY)
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need_sync = 0;
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}
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} else {
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/* Sending more stuff */
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/* Shift out */
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via[ACR] |= SR_OUT;
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|
/* Write */
|
|
via[SR] = req->data[data_index++];
|
|
/* Signal 'byte ready' */
|
|
via[B] |= TACK;
|
|
}
|
|
break;
|
|
|
|
case reading:
|
|
/* Shift in */
|
|
/* via[ACR] &= ~SR_OUT; */ /* Not in 2.2 */
|
|
if (reply_len++ > 16) {
|
|
printk(KERN_ERR "maciisi_interrupt: reply too long, aborting read\n");
|
|
via[B] |= TACK;
|
|
udelay(ADB_DELAY);
|
|
via[B] &= ~(TACK|TIP);
|
|
maciisi_state = idle;
|
|
i = maciisi_start();
|
|
if(i == 0 && need_sync) {
|
|
/* Packet needs to be synced */
|
|
maciisi_sync(current_req);
|
|
}
|
|
if(i != -EBUSY)
|
|
need_sync = 0;
|
|
break;
|
|
}
|
|
/* Read data */
|
|
*reply_ptr++ = via[SR];
|
|
status = via[B] & (TIP|TREQ);
|
|
/* ACK on/off */
|
|
via[B] |= TACK;
|
|
udelay(ADB_DELAY);
|
|
via[B] &= ~TACK;
|
|
if (!(status & TREQ))
|
|
break; /* more stuff to deal with */
|
|
|
|
/* end of frame */
|
|
via[B] &= ~TIP;
|
|
tmp = via[SR]; /* That's what happens in 2.2 */
|
|
udelay(ADB_DELAY); /* Give controller time to recover */
|
|
|
|
/* end of packet, deal with it */
|
|
if (reading_reply) {
|
|
req = current_req;
|
|
req->reply_len = reply_ptr - req->reply;
|
|
if (req->data[0] == ADB_PACKET) {
|
|
/* Have to adjust the reply from ADB commands */
|
|
if (req->reply_len <= 2 || (req->reply[1] & 2) != 0) {
|
|
/* the 0x2 bit indicates no response */
|
|
req->reply_len = 0;
|
|
} else {
|
|
/* leave just the command and result bytes in the reply */
|
|
req->reply_len -= 2;
|
|
memmove(req->reply, req->reply + 2, req->reply_len);
|
|
}
|
|
}
|
|
#ifdef DEBUG_MACIISI_ADB
|
|
if (dump_reply) {
|
|
int i;
|
|
printk(KERN_DEBUG "maciisi_interrupt: reply is ");
|
|
for (i = 0; i < req->reply_len; ++i)
|
|
printk(" %.2x", req->reply[i]);
|
|
printk("\n");
|
|
}
|
|
#endif
|
|
req->complete = 1;
|
|
current_req = req->next;
|
|
if (req->done)
|
|
(*req->done)(req);
|
|
/* Obviously, we got it */
|
|
reading_reply = 0;
|
|
} else {
|
|
maciisi_input(maciisi_rbuf, reply_ptr - maciisi_rbuf);
|
|
}
|
|
maciisi_state = idle;
|
|
status = via[B] & (TIP|TREQ);
|
|
if (!(status & TREQ)) {
|
|
/* Timeout?! More likely, another packet coming in already */
|
|
#ifdef DEBUG_MACIISI_ADB
|
|
printk(KERN_DEBUG "extra data after packet: status %x ifr %x\n",
|
|
status, via[IFR]);
|
|
#endif
|
|
#if 0
|
|
udelay(ADB_DELAY);
|
|
via[B] |= TIP;
|
|
|
|
maciisi_state = reading;
|
|
reading_reply = 0;
|
|
reply_ptr = maciisi_rbuf;
|
|
#else
|
|
/* Process the packet now */
|
|
reading_reply = 0;
|
|
goto switch_start;
|
|
#endif
|
|
/* We used to do this... but the controller might actually have data for us */
|
|
/* maciisi_stfu(); */
|
|
}
|
|
else {
|
|
/* Do any queued requests now if possible */
|
|
i = maciisi_start();
|
|
if(i == 0 && need_sync) {
|
|
/* Packet needs to be synced */
|
|
maciisi_sync(current_req);
|
|
}
|
|
if(i != -EBUSY)
|
|
need_sync = 0;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
printk("maciisi_interrupt: unknown maciisi_state %d?\n", maciisi_state);
|
|
}
|
|
local_irq_restore(flags);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static void
|
|
maciisi_input(unsigned char *buf, int nb)
|
|
{
|
|
#ifdef DEBUG_MACIISI_ADB
|
|
int i;
|
|
#endif
|
|
|
|
switch (buf[0]) {
|
|
case ADB_PACKET:
|
|
adb_input(buf+2, nb-2, buf[1] & 0x40);
|
|
break;
|
|
default:
|
|
#ifdef DEBUG_MACIISI_ADB
|
|
printk(KERN_DEBUG "data from IIsi ADB (%d bytes):", nb);
|
|
for (i = 0; i < nb; ++i)
|
|
printk(" %.2x", buf[i]);
|
|
printk("\n");
|
|
#endif
|
|
break;
|
|
}
|
|
}
|