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@@ -1,677 +0,0 @@
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-/*
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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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-
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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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-
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-static volatile unsigned char *via;
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-
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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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-
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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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-
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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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-
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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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-
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-#define ADB_DELAY 150
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-
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-#undef DEBUG_MACIISI_ADB
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-
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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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-
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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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-
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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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-
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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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-
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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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-
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- via = via1;
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- return 0;
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-}
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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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-
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- if (via == NULL)
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- return -ENODEV;
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-
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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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-
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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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-
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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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-
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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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-
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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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-
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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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-
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- udelay(ADB_DELAY);
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-
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- status = via[B] & (TIP|TREQ);
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-
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- if (!(status & TREQ))
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- {
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- via[B] |= TIP;
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-
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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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-
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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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-
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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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-
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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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-
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- via[IER] = IER_SET | SR_INT;
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-}
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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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-
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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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-
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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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-
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- maciisi_state = idle;
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- need_sync = 0;
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-
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- return 0;
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-}
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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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-
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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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-
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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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-
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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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-
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- req->reply_expected = 1;
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-
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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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-
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- return 0;
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-}
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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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-
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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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-
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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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-
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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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-
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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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-
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- return maciisi_send_request(req, 1);
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-}
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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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-
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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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-
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- local_irq_save(flags);
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-
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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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-
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- local_irq_restore(flags);
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-
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- return 0;
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-}
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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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-
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-#ifdef DEBUG_MACIISI_ADB
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- status = via[B] & (TIP | TREQ);
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-
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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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-
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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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-
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- req = current_req;
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- if (req == NULL)
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- return -EINVAL;
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-
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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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-
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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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-
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- return 0;
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-}
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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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-
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- local_irq_save(flags);
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|
|
- if (via[IFR] & SR_INT) {
|
|
|
- maciisi_interrupt(0, NULL);
|
|
|
- }
|
|
|
- else /* avoid calling this function too quickly in a loop */
|
|
|
- udelay(ADB_DELAY);
|
|
|
-
|
|
|
- local_irq_restore(flags);
|
|
|
-}
|
|
|
-
|
|
|
-/* Shift register interrupt - this is *supposed* to mean that the
|
|
|
- register is either full or empty. In practice, I have no idea what
|
|
|
- it means :( */
|
|
|
-static irqreturn_t
|
|
|
-maciisi_interrupt(int irq, void* arg)
|
|
|
-{
|
|
|
- int status;
|
|
|
- struct adb_request *req;
|
|
|
-#ifdef DEBUG_MACIISI_ADB
|
|
|
- static int dump_reply = 0;
|
|
|
-#endif
|
|
|
- int i;
|
|
|
- unsigned long flags;
|
|
|
-
|
|
|
- local_irq_save(flags);
|
|
|
-
|
|
|
- status = via[B] & (TIP|TREQ);
|
|
|
-#ifdef DEBUG_MACIISI_ADB
|
|
|
- printk(KERN_DEBUG "state %d status %x ifr %x\n", maciisi_state, status, via[IFR]);
|
|
|
-#endif
|
|
|
-
|
|
|
- if (!(via[IFR] & SR_INT)) {
|
|
|
- /* Shouldn't happen, we hope */
|
|
|
- printk(KERN_ERR "maciisi_interrupt: called without interrupt flag set\n");
|
|
|
- local_irq_restore(flags);
|
|
|
- return IRQ_NONE;
|
|
|
- }
|
|
|
-
|
|
|
- /* Clear the interrupt */
|
|
|
- /* via[IFR] = SR_INT; */
|
|
|
-
|
|
|
- switch_start:
|
|
|
- switch (maciisi_state) {
|
|
|
- case idle:
|
|
|
- if (status & TIP)
|
|
|
- printk(KERN_ERR "maciisi_interrupt: state is idle but TIP asserted!\n");
|
|
|
-
|
|
|
- if(!reading_reply)
|
|
|
- udelay(ADB_DELAY);
|
|
|
- /* Shift in */
|
|
|
- via[ACR] &= ~SR_OUT;
|
|
|
- /* Signal start of frame */
|
|
|
- via[B] |= TIP;
|
|
|
- /* Clear the interrupt (throw this value on the floor, it's useless) */
|
|
|
- tmp = via[SR];
|
|
|
- /* ACK adb chip, high-low */
|
|
|
- via[B] |= TACK;
|
|
|
- udelay(ADB_DELAY);
|
|
|
- via[B] &= ~TACK;
|
|
|
- reply_len = 0;
|
|
|
- maciisi_state = reading;
|
|
|
- if (reading_reply) {
|
|
|
- reply_ptr = current_req->reply;
|
|
|
- } else {
|
|
|
- reply_ptr = maciisi_rbuf;
|
|
|
- }
|
|
|
- break;
|
|
|
-
|
|
|
- case sending:
|
|
|
- /* via[SR]; */
|
|
|
- /* Set ACK off */
|
|
|
- via[B] &= ~TACK;
|
|
|
- req = current_req;
|
|
|
-
|
|
|
- if (!(status & TREQ)) {
|
|
|
- /* collision */
|
|
|
- printk(KERN_ERR "maciisi_interrupt: send collision\n");
|
|
|
- /* Set idle and input */
|
|
|
- via[ACR] &= ~SR_OUT;
|
|
|
- tmp = via[SR];
|
|
|
- via[B] &= ~TIP;
|
|
|
- /* Must re-send */
|
|
|
- reading_reply = 0;
|
|
|
- reply_len = 0;
|
|
|
- maciisi_state = idle;
|
|
|
- udelay(ADB_DELAY);
|
|
|
- /* process this now, because the IFR has been cleared */
|
|
|
- goto switch_start;
|
|
|
- }
|
|
|
-
|
|
|
- udelay(ADB_DELAY);
|
|
|
-
|
|
|
- if (data_index >= req->nbytes) {
|
|
|
- /* Sent the whole packet, put the bus back in idle state */
|
|
|
- /* Shift in, we are about to read a reply (hopefully) */
|
|
|
- via[ACR] &= ~SR_OUT;
|
|
|
- tmp = via[SR];
|
|
|
- /* End of frame */
|
|
|
- via[B] &= ~TIP;
|
|
|
- req->sent = 1;
|
|
|
- maciisi_state = idle;
|
|
|
- if (req->reply_expected) {
|
|
|
- /* Note: only set this once we've
|
|
|
- successfully sent the packet */
|
|
|
- reading_reply = 1;
|
|
|
- } else {
|
|
|
- current_req = req->next;
|
|
|
- if (req->done)
|
|
|
- (*req->done)(req);
|
|
|
- /* Do any queued requests now */
|
|
|
- i = maciisi_start();
|
|
|
- if(i == 0 && need_sync) {
|
|
|
- /* Packet needs to be synced */
|
|
|
- maciisi_sync(current_req);
|
|
|
- }
|
|
|
- if(i != -EBUSY)
|
|
|
- need_sync = 0;
|
|
|
- }
|
|
|
- } else {
|
|
|
- /* Sending more stuff */
|
|
|
- /* Shift out */
|
|
|
- via[ACR] |= SR_OUT;
|
|
|
- /* 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;
|
|
|
- }
|
|
|
-}
|
Finn Thain