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2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 | /*
* MACII ADB keyboard handler.
* Copyright (c) 1997 Alan Cox
*
* Derived from code
* Copyright (C) 1996 Paul Mackerras.
*
* MSch (9/97) Partial rewrite of interrupt handler to MacII style
* ADB handshake, based on:
* - Guide to Mac Hardware
* - Guido Koerber's session with a logic analyzer
*
* MSch (1/98) Integrated start of IIsi driver by Robert Thompson
*/
#include <stdarg.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/miscdevice.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/sched.h>
#include <linux/malloc.h>
#include <linux/mm.h>
#include "via6522.h"
#include <asm/uaccess.h>
#include <asm/io.h>
#include <asm/adb.h>
#include <asm/system.h>
#include <asm/segment.h>
#include <asm/setup.h>
#include <asm/macintosh.h>
#include <asm/macints.h>
#define MACII /* For now - will be a switch */
/* Bits in B data register: all active low */
#define TREQ 0x08 /* Transfer request (input) */
#define TACK 0x10 /* Transfer acknowledge (output) */
#define TIP 0x20 /* Transfer in progress (output) */
/* Bits in B data register: ADB transaction states MacII */
#define ST_MASK 0x30 /* mask for selecting ADB state bits */
/* ADB transaction states according to GMHW */
#define ST_CMD 0x00 /* ADB state: command byte */
#define ST_EVEN 0x10 /* ADB state: even data byte */
#define ST_ODD 0x20 /* ADB state: odd data byte */
#define ST_IDLE 0x30 /* ADB state: idle, nothing to send */
/* Bits in ACR */
#define SR_CTRL 0x1c /* Shift register control bits */
#ifdef USE_ORIG
#define SR_EXT 0x1c /* Shift on external clock */
#else
#define SR_EXT 0x0c /* Shift on external clock */
#endif
#define SR_OUT 0x10 /* Shift out if 1 */
/* Bits in IFR and IER */
#define IER_SET 0x80 /* set bits in IER */
#define IER_CLR 0 /* clear bits in IER */
#define SR_INT 0x04 /* Shift register full/empty */
#define SR_DATA 0x08 /* Shift register data */
#define SR_CLOCK 0x10 /* Shift register clock */
/* JRT */
#define ADB_DELAY 150
static struct adb_handler {
void (*handler)(unsigned char *, int, struct pt_regs *);
} adb_handler[16];
static enum adb_state {
idle,
sent_first_byte,
sending,
reading,
read_done,
awaiting_reply
} adb_state;
static struct adb_request *current_req;
static struct adb_request *last_req;
static unsigned char cuda_rbuf[16];
static unsigned char *reply_ptr;
static int reply_len;
static int reading_reply;
static int data_index;
static int first_byte;
static int prefix_len;
static int status = ST_IDLE|TREQ;
static int last_status;
static int driver_running = 0;
/*static int adb_delay;*/
int in_keybinit = 1;
static void adb_start(void);
extern void adb_interrupt(int irq, void *arg, struct pt_regs *regs);
extern void adb_cuda_interrupt(int irq, void *arg, struct pt_regs *regs);
extern void adb_clock_interrupt(int irq, void *arg, struct pt_regs *regs);
extern void adb_data_interrupt(int irq, void *arg, struct pt_regs *regs);
static void adb_input(unsigned char *buf, int nb, struct pt_regs *regs);
static void adb_hw_setup_IIsi(void);
static void adb_hw_setup_cuda(void);
/*
* debug level 10 required for ADB logging (should be && debug_adb, ideally)
*/
extern int console_loglevel;
/*
* Misc. defines for testing - should go to header :-(
*/
#define ADBDEBUG_STATUS (1)
#define ADBDEBUG_STATE (2)
#define ADBDEBUG_READ (4)
#define ADBDEBUG_WRITE (8)
#define ADBDEBUG_START (16)
#define ADBDEBUG_RETRY (32)
#define ADBDEBUG_POLL (64)
#define ADBDEBUG_INT (128)
#define ADBDEBUG_PROT (256)
#define ADBDEBUG_SRQ (512)
#define ADBDEBUG_REQUEST (1024)
#define ADBDEBUG_INPUT (2048)
#define ADBDEBUG_DEVICE (4096)
#define ADBDEBUG_IISI (8192)
/*#define DEBUG_ADB*/
#ifdef DEBUG_ADB
#define ADBDEBUG (ADBDEBUG_INPUT | ADBDEBUG_READ | ADBDEBUG_START | ADBDEBUG_WRITE | ADBDEBUG_SRQ | ADBDEBUG_REQUEST)
#else
#define ADBDEBUG (0)
#endif
#define TRY_CUDA
void adb_bus_init(void)
{
unsigned long flags;
unsigned char c, i;
save_flags(flags);
cli();
/*
* Setup ADB
*/
switch(macintosh_config->adb_type)
{
case MAC_ADB_II:
printk("adb: MacII style keyboard/mouse driver.\n");
/* Set the lines up. We want TREQ as input TACK|TIP as output */
via_write(via1, vDirB, ((via_read(via1,vDirB)|TACK|TIP)&~TREQ));
/*
* Docs suggest TREQ should be output - that seems nuts
* BSD agrees here :-)
* Setup vPCR ??
*/
#ifdef USE_ORIG
/* Lower the bus signals (MacII is active low it seems ???) */
via_write(via1, vBufB, via_read(via1, vBufB)&~TACK);
#else
/* Corresponding state: idle (clear state bits) */
via_write(via1, vBufB, (via_read(via1, vBufB)&~ST_MASK)|ST_IDLE);
last_status = (via_read(via1, vBufB)&~ST_MASK);
#endif
/* Shift register on input */
c=via_read(via1, vACR);
c&=~SR_CTRL; /* Clear shift register bits */
c|=SR_EXT; /* Shift on external clock; out or in? */
via_write(via1, vACR, c);
/* Wipe any pending data and int */
via_read(via1, vSR);
/* This is interrupts on enable SR for keyboard */
via_write(via1, vIER, IER_SET|SR_INT);
/* This clears the interrupt bit */
via_write(via1, vIFR, SR_INT);
/*
* Ok we probably ;) have a ready to use adb bus. Its also
* hopefully idle (Im assuming the mac didnt leave a half
* complete transaction on booting us).
*/
request_irq(IRQ_MAC_ADB, adb_interrupt, IRQ_FLG_LOCK,
"adb interrupt", adb_interrupt);
adb_state = idle;
break;
/*
* Unsupported; but later code doesn't notice !!
*/
case MAC_ADB_CUDA:
printk("adb: CUDA interface.\n");
#if 0
/* don't know what to set up here ... */
adb_state = idle;
/* Set the lines up. We want TREQ as input TACK|TIP as output */
via_write(via1, vDirB, ((via_read(via1,vDirB)|TACK|TIP)&~TREQ));
#endif
adb_hw_setup_cuda();
adb_state = idle;
request_irq(IRQ_MAC_ADB, adb_cuda_interrupt, IRQ_FLG_LOCK,
"adb CUDA interrupt", adb_cuda_interrupt);
break;
case MAC_ADB_IISI:
printk("adb: Using IIsi hardware.\n");
printk("\tDEBUG_JRT\n");
/* Set the lines up. We want TREQ as input TACK|TIP as output */
via_write(via1, vDirB, ((via_read(via1,vDirB)|TACK|TIP)&~TREQ));
/*
* MSch: I'm pretty sure the setup is mildly wrong
* for the IIsi.
*/
/* Initial state: idle (clear state bits) */
via_write(via1, vBufB, (via_read(via1, vBufB) & ~(TIP|TACK)) );
last_status = (via_read(via1, vBufB)&~ST_MASK);
/* Shift register on input */
c=via_read(via1, vACR);
c&=~SR_CTRL; /* Clear shift register bits */
c|=SR_EXT; /* Shift on external clock; out or in? */
via_write(via1, vACR, c);
/* Wipe any pending data and int */
via_read(via1, vSR);
/* This is interrupts on enable SR for keyboard */
via_write(via1, vIER, IER_SET|SR_INT);
/* This clears the interrupt bit */
via_write(via1, vIFR, SR_INT);
/* get those pesky clock ticks we missed while booting */
for ( i = 0; i < 60; i++) {
udelay(ADB_DELAY);
adb_hw_setup_IIsi();
udelay(ADB_DELAY);
if (via_read(via1, vBufB) & TREQ)
break;
}
if (i == 60)
printk("adb_IIsi: maybe bus jammed ??\n");
/*
* Ok we probably ;) have a ready to use adb bus. Its also
*/
request_irq(IRQ_MAC_ADB, adb_cuda_interrupt, IRQ_FLG_LOCK,
"adb interrupt", adb_cuda_interrupt);
adb_state = idle;
break;
default:
printk("adb: Unknown hardware interface.\n");
nosupp:
printk("adb: Interface unsupported.\n");
restore_flags(flags);
return;
}
/*
* XXX: interrupt only registered if supported HW !!
* -> unsupported HW will just time out on keyb_init!
*/
#if 0
request_irq(IRQ_MAC_ADB, adb_interrupt, IRQ_FLG_LOCK,
"adb interrupt", adb_interrupt);
#endif
#ifdef DEBUG_ADB_INTS
request_irq(IRQ_MAC_ADB_CL, adb_clock_interrupt, IRQ_FLG_LOCK,
"adb clock interrupt", adb_clock_interrupt);
request_irq(IRQ_MAC_ADB_SD, adb_data_interrupt, IRQ_FLG_LOCK,
"adb data interrupt", adb_data_interrupt);
#endif
printk("adb: init done.\n");
restore_flags(flags);
}
void adb_hw_setup_cuda(void)
{
int x;
unsigned long flags;
printk("CUDA: HW Setup:");
save_flags(flags);
cli();
if (console_loglevel == 10)
printk(" 1,");
/* Set the direction of the cuda signals, TIP+TACK are output TREQ is an input */
via_write( via1, vDirB, via_read( via1, vDirB ) | TIP | TACK );
via_write( via1, vDirB, via_read( via1, vDirB ) & ~TREQ );
if (console_loglevel == 10)
printk("2,");
/* Set the clock control. Set to shift data in by external clock CB1 */
via_write( via1, vACR, ( via_read(via1, vACR ) | SR_EXT ) & ~SR_OUT );
if (console_loglevel == 10)
printk("3,");
/* Clear any possible Cuda interrupt */
x = via_read( via1, vSR );
if (console_loglevel == 10)
printk("4,");
/* Terminate transaction and set idle state */
via_write( via1, vBufB, via_read( via1, vBufB ) | TIP | TACK );
if (console_loglevel == 10)
printk("5,");
/* Delay 4 mS for ADB reset to complete */
udelay(4000);
if (console_loglevel == 10)
printk("6,");
/* Clear pending interrupts... */
x = via_read( via1, vSR );
if (console_loglevel == 10)
printk("7,");
/* Issue a sync transaction, TACK asserted while TIP negated */
via_write( via1, vBufB, via_read( via1, vBufB ) & ~TACK );
if (console_loglevel == 10)
printk("8,");
/* Wait for the sync acknowledgement, Cuda to assert TREQ */
while( ( via_read( via1, vBufB ) & TREQ ) != 0 )
barrier();
if (console_loglevel == 10)
printk("9,");
/* Wait for the sync acknowledment interrupt */
while( ( via_read( via1, vIFR ) & SR_INT ) == 0 )
barrier();
if (console_loglevel == 10)
printk("10,");
/* Clear pending interrupts... */
x = via_read( via1, vSR );
if (console_loglevel == 10)
printk("11,");
/* Terminate the sync cycle by negating TACK */
via_write( via1, vBufB, via_read( via1, vBufB ) | TACK );
if (console_loglevel == 10)
printk("12,");
/* Wait for the sync termination acknowledgement, Cuda to negate TREQ */
while( ( via_read( via1, vBufB ) & TREQ ) == 0 )
barrier();
if (console_loglevel == 10)
printk("13,");
/* Wait for the sync termination acknowledment interrupt */
while( ( via_read( via1, vIFR ) & SR_INT ) == 0 )
barrier();
if (console_loglevel == 10)
printk("14,");
/* Terminate transaction and set idle state, TIP+TACK negate */
via_write( via1, vBufB, via_read( via1, vBufB ) | TIP );
if (console_loglevel == 10)
printk("15 !");
/* Clear pending interrupts... */
x = via_read( via1, vSR );
restore_flags(flags);
printk("\nCUDA: HW Setup done!\n");
}
void adb_hw_setup_IIsi(void)
{
int dummy;
long poll_timeout;
printk("adb_IIsi: cleanup!\n");
/* ??? */
udelay(ADB_DELAY);
/* disable SR int. */
via_write(via1, vIER, IER_CLR|SR_INT);
/* set SR to shift in */
via_write(via1, vACR, via_read(via1, vACR ) & ~SR_OUT);
/* this is required, especially on faster machines */
udelay(ADB_DELAY);
if (!(via_read(via1, vBufB) & TREQ)) { /* IRQ on */
/* start frame */
via_write(via1, vBufB,via_read(via1,vBufB) | TIP);
while (1) {
/* poll for ADB interrupt and watch for timeout */
/* if time out, keep going in hopes of not hanging the
* ADB chip - I think */
poll_timeout = ADB_DELAY * 5;
while ( !(via_read(via1, vIFR) & SR_INT)
&& (poll_timeout-- > 0) )
dummy = via_read(via1, vBufB);
dummy = via_read(via1, vSR); /* reset interrupt flag */
/* perhaps put in a check here that ignores all data
* after the first ADB_MAX_MSG_LENGTH bytes ??? */
/* end of frame reached ?? */
if (via_read(via1, vBufB) & TREQ)
break;
/* set ACK */
via_write(via1,vBufB,via_read(via1, vBufB) | TACK);
/* delay */
udelay(ADB_DELAY);
/* clear ACK */
via_write(via1,vBufB,via_read(via1, vBufB) & ~TACK);
}
/* end frame */
via_write(via1, vBufB,via_read(via1,vBufB) & ~TIP);
/* probably don't need to delay this long */
udelay(ADB_DELAY);
}
/* re-enable SR int. */
via_write(via1, vIER, IER_SET|SR_INT);
}
#define WAIT_FOR(cond, what) \
do { \
for (x = 1000; !(cond); --x) { \
if (x == 0) { \
printk("Timeout waiting for " what); \
return 0; \
} \
__delay(100*160); \
} \
} while (0)
/*
* Construct and send an adb request
* This function is the main entry point into the ADB driver from
* kernel code; it takes the request data supplied and populates the
* adb_request structure.
* In order to keep this interface independent from any assumption about
* the underlying ADB hardware, we take requests in CUDA format here,
* the ADB packet 'prefixed' with a packet type code.
* Non-CUDA hardware is confused by this, so we strip the packet type
* here depending on hardware type ...
*/
int adb_request(struct adb_request *req, void (*done)(struct adb_request *),
int nbytes, ...)
{
va_list list;
int i, start;
va_start(list, nbytes);
/*
* skip first byte if not CUDA
*/
if (macintosh_config->adb_type == MAC_ADB_II) {
start = va_arg(list, int);
nbytes--;
}
req->nbytes = nbytes;
req->done = done;
#if (ADBDEBUG & ADBDEBUG_REQUEST)
if (console_loglevel == 10)
printk("adb_request, data bytes: ");
#endif
for (i = 0; i < nbytes; ++i) {
req->data[i] = va_arg(list, int);
#if (ADBDEBUG & ADBDEBUG_REQUEST)
if (console_loglevel == 10)
printk("%x ", req->data[i]);
#endif
}
#if (ADBDEBUG & ADBDEBUG_REQUEST)
if (console_loglevel == 10)
printk(" !\n");
#endif
va_end(list);
/*
* XXX: This might be fatal if no reply is generated (i.e. Listen) !
* Currently, the interrupt handler 'fakes' a reply on non-TALK
* commands for this reason.
* Also, we need a CUDA_AUTOPOLL emulation here for non-CUDA
* Macs, and some mechanism to remember the last issued TALK
* request for resending it repeatedly on timeout!
*/
req->reply_expected = 1;
return adb_send_request(req);
}
/*
* Construct an adb request for later sending
* This function only populates the adb_request structure, without
* actually queueing it.
* Reason: Poll requests and Talk requests need to be handled in a way
* different from 'user' requests; no reply_expected is set and
* Poll requests need to be placed at the head of the request queue.
* Using adb_request results in implicit queueing at the tail of the
* request queue (duplicating the Poll) with reply_expected set.
* No adjustment of packet data is necessary, as this mechanisnm is not
* used by CUDA hardware (Autopoll used instead).
*/
int adb_build_request(struct adb_request *req, void (*done)(struct adb_request *),
int nbytes, ...)
{
va_list list;
int i;
req->nbytes = nbytes;
req->done = done;
va_start(list, nbytes);
#if (ADBDEBUG & ADBDEBUG_REQUEST)
if (console_loglevel == 10)
printk("adb__build_request, data bytes: ");
#endif
/*
* skip first byte if not CUDA ?
*/
for (i = 0; i < nbytes; ++i) {
req->data[i] = va_arg(list, int);
#if (ADBDEBUG & ADBDEBUG_REQUEST)
if (console_loglevel == 10)
printk("%x ", req->data[i]);
#endif
}
#if (ADBDEBUG & ADBDEBUG_REQUEST)
if (console_loglevel == 10)
printk(" !\n");
#endif
va_end(list);
req->reply_expected = 0;
return 0;
}
/*
* Send an ADB poll (Talk, tagged on the front of the request queue)
*/
void adb_queue_poll(void)
{
static int pod=0;
static int in_poll=0;
static struct adb_request r;
unsigned long flags;
if(in_poll)
printk("Double poll!\n");
in_poll++;
pod++;
if(pod>7) /* 15 */
pod=0;
#if (ADBDEBUG & ADBDEBUG_POLL)
if (console_loglevel == 10)
printk("adb: Polling %d\n",pod);
#endif
if (macintosh_config->adb_type == MAC_ADB_II)
/* XXX: that's a TALK, register 0, MacII version */
adb_build_request(&r,NULL, 1, (pod<<4|0xC));
else
/* CUDA etc. version */
adb_build_request(&r,NULL, 2, 0, (pod<<4|0xC));
r.reply_expected=0;
r.done=NULL;
r.sent=0;
r.got_reply=0;
r.reply_len=0;
save_flags(flags);
cli();
/* Poll inserted at head of queue ... */
r.next=current_req;
current_req=&r;
restore_flags(flags);
adb_start();
in_poll--;
}
/*
* Send an ADB retransmit (Talk, appended to the request queue)
*/
void adb_retransmit(int device)
{
static int in_retransmit=0;
static struct adb_request rt;
unsigned long flags;
if(in_retransmit)
printk("Double retransmit!\n");
in_retransmit++;
#if (ADBDEBUG & ADBDEBUG_POLL)
if (console_loglevel == 10)
printk("adb: Sending retransmit: %d\n", device);
#endif
/* MacII version */
adb_build_request(&rt,NULL, 1, (device<<4|0xC));
rt.reply_expected = 0;
rt.done = NULL;
rt.sent = 0;
rt.got_reply = 0;
rt.reply_len = 0;
rt.next = NULL;
save_flags(flags);
cli();
/* Retransmit inserted at tail of queue ... */
if (current_req != NULL)
{
last_req->next = &rt;
last_req = &rt;
}
else
{
current_req = &rt;
last_req = &rt;
}
/* always restart driver (send_retransmit used in place of adb_start!)*/
if (adb_state == idle)
adb_start();
restore_flags(flags);
in_retransmit--;
}
/*
* Queue an ADB request; start ADB transfer if necessary
*/
int adb_send_request(struct adb_request *req)
{
unsigned long flags;
req->next = 0;
req->sent = 0;
req->got_reply = 0;
req->reply_len = 0;
save_flags(flags);
cli();
if (current_req != NULL)
{
last_req->next = req;
last_req = req;
}
else
{
current_req = req;
last_req = req;
if (adb_state == idle)
adb_start();
}
restore_flags(flags);
return 0;
}
static int nclock, ndata;
static int need_poll = 0;
static int command_byte = 0;
static int last_reply = 0;
static int last_active = 0;
static struct adb_request *retry_req;
/*
* Start sending ADB packet
*/
static void adb_start(void)
{
unsigned long flags;
struct adb_request *req;
/*
* We get here on three 'sane' conditions:
* 1) called from send_adb_request, if adb_state == idle
* 2) called from within adb_interrupt, if adb_state == idle
* (after receiving, or after sending a LISTEN)
* 3) called from within adb_interrupt, if adb_state == sending
* and no reply is expected (immediate next command).
* Maybe we get here on SRQ as well ??
*/
/* get the packet to send */
req = current_req;
/* assert adb_state == idle */
if (adb_state != idle) {
printk("ADB: adb_start called while driver busy (%p %x %x)!\n",
req, adb_state, via_read(via1, vBufB)&(ST_MASK|TREQ));
return;
}
if (req == 0)
return;
save_flags(flags);
cli();
#if (ADBDEBUG & ADBDEBUG_START)
if (console_loglevel == 10)
printk("adb_start: request %p ", req);
#endif
nclock = 0;
ndata = 0;
/*
* IRQ signaled ?? (means ADB controller wants to send, or might
* be end of packet if we were reading)
*/
if ((via_read(via1, vBufB) & TREQ) == 0)
{
switch(macintosh_config->adb_type)
{
/*
* FIXME - we need to restart this on a timer
* or a collision at boot hangs us.
* Never set adb_state to idle here, or adb_start
* won't be called again from send_request!
* (need to re-check other cases ...)
*/
case MAC_ADB_CUDA:
/* printk("device busy - fail\n"); */
restore_flags(flags);
/* a byte is coming in from the CUDA */
return;
case MAC_ADB_IISI:
printk("adb_start: device busy - fail\n");
retry_req = req;
restore_flags(flags);
return;
case MAC_ADB_II:
/*
* if the interrupt handler set the need_poll
* flag, it's hopefully a SRQ poll or re-Talk
* so we try to send here anyway
*/
if (!need_poll) {
printk("device busy - retry %p state %d status %x!\n",
req, adb_state, via_read(via1, vBufB)&(ST_MASK|TREQ));
retry_req = req;
/* set ADB status here ? */
restore_flags(flags);
return;
} else {
#if (ADBDEBUG & ADBDEBUG_START)
if (console_loglevel == 10)
printk("device busy - polling; state %d status %x!\n",
adb_state, via_read(via1, vBufB)&(ST_MASK|TREQ));
#endif
need_poll = 0;
break;
}
}
}
#if 0
/*
* Bus idle ?? Not sure about this one; SRQ might need ST_CMD here!
* OTOH: setting ST_CMD in the interrupt routine would make the
* ADB contoller shift in before this routine starts shifting out ...
*/
if ((via_read(via1, vBufB)&ST_MASK) != ST_IDLE)
{
#if (ADBDEBUG & ADBDEBUG_STATE)
if (console_loglevel == 10)
printk("ADB bus not idle (%x), retry later!\n",
via_read(via1, vBufB)&(ST_MASK|TREQ));
#endif
retry_req = req;
restore_flags(flags);
return;
}
#endif
/*
* Another retry pending? (sanity check)
*/
if (retry_req) {
#if (ADBDEBUG & ADBDEBUG_RETRY)
if (console_loglevel == 10)
if (retry_req == req)
/* new requests are appended at tail of request queue */
printk("adb_start: retry %p pending ! \n", req);
else
/* poll requests are added to the head of queue */
printk("adb_start: retry %p pending, req %p (poll?) current! \n",
retry_req, req);
#endif
retry_req = NULL;
}
/*
* Seems OK, go for it!
*/
switch(macintosh_config->adb_type)
{
case MAC_ADB_CUDA:
/* store command byte (first byte is 'type' byte) */
command_byte = req->data[1];
/* set the shift register to shift out and send a byte */
via_write(via1, vACR, via_read(via1, vACR)|SR_OUT);
via_write(via1, vSR, req->data[0]);
via_write(via1, vBufB, via_read(via1, vBufB)&~TIP);
break;
case MAC_ADB_IISI:
/* store command byte (first byte is 'type' byte) */
command_byte = req->data[1];
/* set ADB state to 'active' */
via_write(via1, vBufB, via_read(via1, vBufB) | TIP);
/* switch ACK off (in case it was left on) */
via_write(via1, vBufB, via_read(via1, vBufB) & ~TACK);
/* set the shift register to shift out and send a byte */
via_write(via1, vACR, via_read(via1, vACR) | SR_OUT);
via_write(via1, vSR, req->data[0]);
/* signal 'byte ready' */
via_write(via1, vBufB, via_read(via1, vBufB) | TACK);
break;
case MAC_ADB_II:
/* store command byte */
command_byte = req->data[0];
/* Output mode */
via_write(via1, vACR, via_read(via1, vACR)|SR_OUT);
/* Load data */
via_write(via1, vSR, req->data[0]);
#ifdef USE_ORIG
/* Turn off TIP/TACK - this should tell the external logic to
start the external shift clock */
/* via_write(via1, vBufB, via_read(via1, vBufB)&~(TIP|TACK));*/
via_write(via1, vBufB, via_read(via1, vBufB)|(TIP|TACK));
#else
/* set ADB state to 'command' */
via_write(via1, vBufB, (via_read(via1, vBufB)&~ST_MASK)|ST_CMD);
#endif
break;
}
adb_state = sent_first_byte;
data_index = 1;
#if (ADBDEBUG & ADBDEBUG_START)
if (console_loglevel == 10)
printk("sent first byte of %d: %x, (%x %x) ... ",
req->nbytes, req->data[0], adb_state,
(via_read(via1, vBufB) & (ST_MASK|TREQ)) );
#endif
restore_flags(flags);
}
/*
* Poll the ADB state (maybe obsolete now that interrupt-driven ADB runs)
*/
void adb_poll(void)
{
unsigned char c;
unsigned long flags;
save_flags(flags);
cli();
c=via_read(via1, vIFR);
#if (ADBDEBUG & ADBDEBUG_POLL)
#ifdef DEBUG_ADB_INTS
if (console_loglevel == 10) {
printk("adb_poll: IFR %x state %x cl %d dat %d ",
c, adb_state, nclock, ndata);
if (c & (SR_CLOCK|SR_DATA)) {
if (c & SR_CLOCK)
printk("adb clock event ");
if (c & SR_DATA)
printk("adb data event ");
}
}
#else
if (console_loglevel == 10)
printk("adb_poll: IFR %x state %x ",
c, adb_state);
#endif
if (console_loglevel == 10)
printk("\r");
#endif
if (c & SR_INT)
{
#if (ADBDEBUG & ADBDEBUG_POLL)
if (console_loglevel == 10)
printk("adb_poll: adb interrupt event\n");
#endif
adb_interrupt(0, 0, 0);
}
restore_flags(flags);
}
/*
* Debugging gimmicks
*/
void adb_clock_interrupt(int irq, void *arg, struct pt_regs *regs)
{
nclock++;
}
void adb_data_interrupt(int irq, void *arg, struct pt_regs *regs)
{
ndata++;
}
/*
* The notorious ADB interrupt handler - does all of the protocol handling,
* except for starting new send operations. Relies heavily on the ADB
* controller sending and receiving data, thereby generating SR interrupts
* for us. This means there has to be always activity on the ADB bus, otherwise
* the whole process dies and has to be re-kicked by sending TALK requests ...
* CUDA-based Macs seem to solve this with the autopoll option, for MacII-type
* ADB the problem isn't solved yet (retransmit of the latest active TALK seems
* a good choice; either on timeout or on a timer interrupt).
*
* The basic ADB state machine was left unchanged from the original MacII code
* by Alan Cox, which was based on the CUDA driver for PowerMac.
* The syntax of the ADB status lines seems to be totally different on MacII,
* though. MacII uses the states Command -> Even -> Odd -> Even ->...-> Idle for
* sending, and Idle -> Even -> Odd -> Even ->...-> Idle for receiving. Start
* and end of a receive packet are signaled by asserting /IRQ on the interrupt
* line. Timeouts are signaled by a sequence of 4 0xFF, with /IRQ asserted on
* every other byte. SRQ is probably signaled by 3 or more 0xFF tacked on the
* end of a packet. (Thanks to Guido Koerber for eavesdropping on the ADB
* protocol with a logic analyzer!!)
* CUDA seems to use /TIP -> /TIP | TACK -> /TIP -> /TIP | TACK ... -> TIP|TACK
* for sending, and /TIP -> /TIP | TACK -> /TIP -> /TIP | TACK ... -> TIP for
* receiving. No clue how timeouts are handled; SRQ seems to be sent as a
* separate packet. Quite a few changes have been made outside the handshake
* code, so I don't know if the CUDA code still behaves as before.
*
* Note: As of 21/10/97, the MacII ADB part works including timeout detection
* and retransmit (Talk to the last active device). Cleanup of code and
* testing of the CUDA functionality is required, though.
* Note2: As of 13/12/97, CUDA support is definitely broken ...
* Note3: As of 21/12/97, CUDA works on a P475. What was broken? The assumption
* that Q700 and Q800 use CUDA :-(
*
* 27/01/98: IIsi driver implemented (thanks to Robert Thompson for the
* initial bits). See adb_cuda_interrupts ...
*
* Next TODO: implementation of IIsi ADB protocol (maybe the USE_ORIG
* conditionals can be a start?)
*/
void adb_interrupt(int irq, void *arg, struct pt_regs *regs)
{
int x, adbdir;
unsigned long flags;
struct adb_request *req;
last_status = status;
/* prevent races due to SCSI enabling ints */
save_flags(flags);
cli();
if (driver_running) {
restore_flags(flags);
return;
}
driver_running = 1;
#ifdef USE_ORIG
status = (~via_read(via1, vBufB) & (TIP|TREQ)) | (via_read(via1, vACR) & SR_OUT);
#else
if (macintosh_config->adb_type==MAC_ADB_CUDA)
status = (~via_read(via1, vBufB) & (TIP|TREQ)) | (via_read(via1, vACR) & SR_OUT);
else
/* status bits (0x8->0x20) and direction (0x10 ??) CLASH !! */
status = (via_read(via1, vBufB) & (ST_MASK|TREQ));
#endif
adbdir = (via_read(via1, vACR) & SR_OUT);
#if (ADBDEBUG & ADBDEBUG_INT)
if (console_loglevel == 10)
printk("adb_interrupt: state=%d status=%x last=%x direction=%x\n",
adb_state, status, last_status, adbdir);
#endif
switch (adb_state)
{
case idle:
if(macintosh_config->adb_type==MAC_ADB_CUDA)
{
/* CUDA has sent us the first byte of data - unsolicited */
if (status != TREQ)
printk("cuda: state=idle, status=%x\n", status);
x = via_read(via1, vSR);
via_write(via1, vBufB, via_read(via1,vBufB)&~TIP);
}
else if(macintosh_config->adb_type==MAC_ADB_IISI)
{
udelay(150);
/* set SR to IN (??? no byte received else) */
via_write(via1, vACR,via_read(via1, vACR)&~SR_OUT);
/* signal start of frame */
via_write(via1, vBufB, via_read(via1, vBufB) | TIP);
/* read first byte */
x = via_read(via1, vSR);
first_byte = x;
#if (ADBDEBUG & ADBDEBUG_READ)
if (console_loglevel == 10)
printk("adb_macIIsi : receiving unsol. packet: %x (%x %x) ",
x, adb_state, status);
#endif
/* ACK adb chip */
via_write(via1, vBufB, via_read(via1, vBufB) | TACK);
udelay(150);
via_write(via1, vBufB, via_read(via1, vBufB) & ~TACK);
}
else if(macintosh_config->adb_type==MAC_ADB_II)
{
#if (ADBDEBUG & ADBDEBUG_STATUS)
if (status == TREQ && !adbdir)
/* that's: not IRQ, idle, input -> weird */
printk("adb_macII: idle, status=%x dir=%x\n",
status, adbdir);
#endif
x = via_read(via1, vSR);
first_byte = x;
#if (ADBDEBUG & ADBDEBUG_READ)
if (console_loglevel == 10)
printk("adb_macII: receiving unsol. packet: %x (%x %x) ",
x, adb_state, status);
#endif
/* set ADB state = even for first data byte */
via_write(via1, vBufB, (via_read(via1, vBufB)&~ST_MASK)|ST_EVEN);
}
adb_state = reading;
reply_ptr = cuda_rbuf;
reply_len = 0;
reading_reply = 0;
prefix_len = 0;
if (macintosh_config->adb_type==MAC_ADB_II) {
*reply_ptr++ = ADB_PACKET;
*reply_ptr++ = first_byte;
*reply_ptr++ = command_byte; /*first_byte;*/
reply_len = 3;
prefix_len = 3;
}
break;
case awaiting_reply:
if(macintosh_config->adb_type==MAC_ADB_CUDA)
{
/* CUDA has sent us the first byte of data of a reply */
if (status != TREQ)
printk("cuda: state=awaiting_reply, status=%x\n", status);
x = via_read(via1, vSR);
via_write(via1,vBufB,
via_read(via1, vBufB)&~TIP);
}
else if(macintosh_config->adb_type==MAC_ADB_IISI)
{
/* set SR to IN */
via_write(via1, vACR,via_read(via1, vACR)&~SR_OUT);
/* signal start of frame */
via_write(via1, vBufB, via_read(via1, vBufB) | TIP);
/* read first byte */
x = via_read(via1, vSR);
first_byte = x;
#if (ADBDEBUG & ADBDEBUG_READ)
if (console_loglevel == 10)
printk("adb_macIIsi: reading reply: %x (%x %x) ",
x, adb_state, status);
#endif
#if 0
if( via_read(via1,vBufB) & TREQ)
ending = 1;
else
ending = 0;
#endif
/* ACK adb chip */
via_write(via1, vBufB, via_read(via1, vBufB) | TACK);
udelay(150);
via_write(via1, vBufB, via_read(via1, vBufB) & ~TACK);
}
else if(macintosh_config->adb_type==MAC_ADB_II)
{
/* handshake etc. for II ?? */
x = via_read(via1, vSR);
first_byte = x;
#if (ADBDEBUG & ADBDEBUG_READ)
if (console_loglevel == 10)
printk("adb_macII: reading reply: %x (%x %x) ",
x, adb_state, status);
#endif
/* set ADB state = even for first data byte */
via_write(via1, vBufB, (via_read(via1, vBufB)&~ST_MASK)|ST_EVEN);
}
adb_state = reading;
reply_ptr = current_req->reply;
reading_reply = 1;
reply_len = 0;
prefix_len = 0;
if (macintosh_config->adb_type==MAC_ADB_II) {
*reply_ptr++ = ADB_PACKET;
*reply_ptr++ = first_byte;
*reply_ptr++ = first_byte; /* should be command byte */
reply_len = 3;
prefix_len = 3;
}
break;
case sent_first_byte:
#if (ADBDEBUG & ADBDEBUG_WRITE)
if (console_loglevel == 10)
printk(" sending: %x (%x %x) ",
current_req->data[1], adb_state, status);
#endif
if(macintosh_config->adb_type==MAC_ADB_CUDA)
{
if (status == TREQ + TIP + SR_OUT)
{
/* collision */
via_write(via1, vACR,
via_read(via1, vACR)&~SR_OUT);
x = via_read(via1, vSR);
via_write(via1, vBufB,
via_read(via1,vBufB)|TIP|TACK);
adb_state = idle;
}
else
{
/* assert status == TIP + SR_OUT */
if (status != TIP + SR_OUT)
printk("cuda: state=sent_first_byte status=%x\n", status);
via_write(via1,vSR,current_req->data[1]);
via_write(via1, vBufB,
via_read(via1, vBufB)^TACK);
data_index = 2;
adb_state = sending;
}
}
else if(macintosh_config->adb_type==MAC_ADB_IISI)
{
/* switch ACK off */
via_write(via1, vBufB, via_read(via1, vBufB) & ~TACK);
if ( !(via_read(via1, vBufB) & TREQ) )
{
/* collision */
#if (ADBDEBUG & ADBDEBUG_WRITE)
if (console_loglevel == 10)
printk("adb_macIIsi: send collison, aborting!\n");
#endif
/* set shift in */
via_write(via1, vACR,
via_read(via1, vACR)&~SR_OUT);
/* clear SR int. */
x = via_read(via1, vSR);
/* set ADB state to 'idle' */
via_write(via1, vBufB,
via_read(via1,vBufB) & ~(TIP|TACK));
adb_state = idle;
}
else
{
/* delay */
udelay(ADB_DELAY);
/* set the shift register to shift out and send a byte */
#if 0
via_write(via1, vACR, via_read(via1, vACR) | SR_OUT);
#endif
via_write(via1, vSR, current_req->data[1]);
/* signal 'byte ready' */
via_write(via1, vBufB, via_read(via1, vBufB) | TACK);
data_index=2;
adb_state = sending;
}
}
else if(macintosh_config->adb_type==MAC_ADB_II)
{
/* how to detect a collision here ?? */
/* maybe we're already done (Talk, or Poll)? */
if (data_index >= current_req->nbytes)
{
/* assert it's a Talk ?? */
if ( (command_byte&0xc) != 0xc
&& console_loglevel == 10 )
printk("ADB: single byte command, no Talk: %x!\n",
command_byte);
#if (ADBDEBUG & ADBDEBUG_WRITE)
if (console_loglevel == 10)
printk(" -> end (%d of %d) (%x %x)!\n",
data_index, current_req->nbytes, adb_state, status);
#endif
current_req->sent = 1;
if (current_req->reply_expected)
{
#if (ADBDEBUG & ADBDEBUG_WRITE)
if (console_loglevel == 10)
printk("ADB: reply expected on poll!\n");
#endif
adb_state = awaiting_reply;
reading_reply = 0;
} else {
#if (ADBDEBUG & ADBDEBUG_WRITE)
if (console_loglevel == 10)
printk("ADB: no reply for poll, not calling done()!\n");
#endif
req = current_req;
current_req = req->next;
#if 0 /* XXX Not sure about that one ... probably better enabled */
if (req->done)
(*req->done)(req);
#endif
adb_state = idle;
reading_reply = 0;
}
/* set to shift in */
via_write(via1, vACR,
via_read(via1, vACR) & ~SR_OUT);
x=via_read(via1, vSR);
/* set ADB state idle - might get SRQ */
via_write(via1, vBufB,
(via_read(via1, vBufB)&~ST_MASK)|ST_IDLE);
break;
}
#if (ADBDEBUG & ADBDEBUG_STATUS)
if(!(status==(ST_CMD|TREQ) && adbdir == SR_OUT))
printk("adb_macII: sent_first_byte, weird status=%x dir=%x\n",
status, adbdir);
#endif
/* SR already set to shift out; send byte */
via_write(via1, vSR, current_req->data[1]);
/* set state to ST_EVEN (first byte was: ST_CMD) */
via_write(via1, vBufB,
(via_read(via1, vBufB)&~ST_MASK)|ST_EVEN);
data_index=2;
adb_state = sending;
}
break;
case sending:
req = current_req;
if (data_index >= req->nbytes)
{
#if (ADBDEBUG & ADBDEBUG_WRITE)
if (console_loglevel == 10)
printk(" -> end (%d of %d) (%x %x)!\n",
data_index-1, req->nbytes, adb_state, status);
#endif
/* end of packet */
if(macintosh_config->adb_type==MAC_ADB_CUDA)
{
via_write(via1, vACR,
via_read(via1, vACR)&~SR_OUT);
x = via_read(via1, vSR);
via_write(via1, vBufB,
via_read(via1,vBufB)|TACK|TIP);
}
else if(macintosh_config->adb_type==MAC_ADB_IISI)
{
/* XXX maybe clear ACK here ??? */
/* switch ACK off */
via_write(via1, vBufB, via_read(via1, vBufB) & ~TACK);
/* delay */
udelay(ADB_DELAY);
/* set the shift register to shift in */
via_write(via1, vACR, via_read(via1, vACR)|SR_OUT);
/* clear SR int. */
x = via_read(via1, vSR);
/* set ADB state 'idle' (end of frame) */
via_write(via1, vBufB,
via_read(via1,vBufB) & ~(TACK|TIP));
}
else if(macintosh_config->adb_type==MAC_ADB_II)
{
/*
* XXX Not sure: maybe only switch to
* input mode on Talk ??
*/
/* set to shift in */
via_write(via1, vACR,
via_read(via1, vACR) & ~SR_OUT);
x=via_read(via1, vSR);
/* set ADB state idle - might get SRQ */
via_write(via1, vBufB,
(via_read(via1, vBufB)&~ST_MASK)|ST_IDLE);
}
req->sent = 1;
if (req->reply_expected)
{
/*
* maybe fake a reply here on Listen ??
* Otherwise, a Listen hangs on success
*/
if ( macintosh_config->adb_type==MAC_ADB_II
&& ((req->data[0]&0xc) == 0xc) )
adb_state = awaiting_reply;
else if ( macintosh_config->adb_type != MAC_ADB_II
&& ( req->data[0] == 0x0)
&& ((req->data[1]&0xc) == 0xc) )
adb_state = awaiting_reply;
else {
/*
* Reply expected, but none
* possible -> fake reply.
* Problem: sending next command
* should probably be done
* without setting bus to 'idle'!
* (except if no more commands)
*/
#if (ADBDEBUG & ADBDEBUG_PROT)
printk("ADB: reply expected on Listen, faking reply\n");
#endif
/* make it look weird */
/* XXX: return reply_len -1? */
/* XXX: fake ADB header? */
req->reply[0] = req->reply[1] = req->reply[2] = 0xFF;
req->reply_len = 3;
req->got_reply = 1;
current_req = req->next;
if (req->done)
(*req->done)(req);
/*
* ready with this one, run
* next command or repeat last
* Talk (=idle on II)
*/
/* set state to idle !! */
adb_state = idle;
if (current_req || retry_req)
adb_start();
}
}
else
{
current_req = req->next;
if (req->done)
(*req->done)(req);
/* not sure about this */
/*
* MS: Must set idle, no new request
* started else !
*/
adb_state = idle;
/*
* requires setting ADB state to idle,
* maybe read a byte ! (done above)
*/
if (current_req || retry_req)
adb_start();
}
}
else
{
#if (ADBDEBUG & ADBDEBUG_WRITE)
if (console_loglevel == 10)
printk(" %x (%x %x) ",
req->data[data_index], adb_state, status);
#endif
if(macintosh_config->adb_type==MAC_ADB_CUDA)
{
via_write(via1, vSR, req->data[data_index++]);
via_write(via1, vBufB,
via_read(via1, vBufB)^TACK);
}
else if(macintosh_config->adb_type==MAC_ADB_IISI)
{
/* switch ACK off */
via_write(via1, vBufB, via_read(via1, vBufB) & ~TACK);
/* delay */
udelay(ADB_DELAY);
/* XXX: need to check for collision?? */
/* set the shift register to shift out and send a byte */
#if 0
via_write(via1, vACR, via_read(via1, vACR)|SR_OUT);
#endif
via_write(via1, vSR, req->data[data_index++]);
/* signal 'byte ready' */
via_write(via1, vBufB, via_read(via1, vBufB) | TACK);
}
else if(macintosh_config->adb_type==MAC_ADB_II)
{
via_write(via1, vSR, req->data[data_index++]);
/* invert state bits, toggle ODD/EVEN */
x = via_read(via1, vBufB);
via_write(via1, vBufB,
(x&~ST_MASK)|~(x&ST_MASK));
}
}
break;
case reading:
/* timeout / SRQ handling for II hw */
#ifdef POLL_ON_TIMEOUT
if((reply_len-prefix_len)==3 && memcmp(reply_ptr-3,"\xFF\xFF\xFF",3)==0)
#else
if( (first_byte == 0xFF && (reply_len-prefix_len)==2
&& memcmp(reply_ptr-2,"\xFF\xFF",2)==0) ||
((reply_len-prefix_len)==3
&& memcmp(reply_ptr-3,"\xFF\xFF\xFF",3)==0))
#endif
{
/*
* possible timeout (in fact, most probably a
* timeout, since SRQ can't be signaled without
* transfer on the bus).
* The last three bytes seen were FF, together
* with the starting byte (in case we started
* on 'idle' or 'awaiting_reply') this probably
* makes four. So this is mostl likely #5!
* The timeout signal is a pattern 1 0 1 0 0..
* on /INT, meaning we missed it :-(
*/
x = via_read(via1, vSR);
if (x != 0xFF)
printk("ADB: mistaken timeout/SRQ!\n");
/*
* ADB status bits: either even or odd.
* adb_state: need to set 'idle' here.
* Maybe saner: set 'need_poll' or
* 'need_resend' here, fall through to
* read_done ??
*/
#if (ADBDEBUG & ADBDEBUG_READ)
if (console_loglevel == 10)
printk(" -> read aborted: %x (%x %x)!\n",
x, adb_state, status);
#endif
#if 0 /* XXX leave status unchanged!! - need to check this again! */
/* XXX Only touch status on II !!! */
/* set ADB state to idle (required by adb_start()) */
via_write(via1, vBufB,
(via_read(via1, vBufB)&~ST_MASK)|ST_IDLE);
#endif
/*
* What if the timeout happens on reading a
* reply ?? Assemble error reply and call
* current_request->done()? Keep request
* on queue?
*/
/* prevent 'busy' in adb_start() */
need_poll = 1;
/*
* Timeout: /IRQ alternates high/low during
* 4 'FF' bytes (1 0 1 0 0...)
* We're on byte 5, so we need one
* more backlog here (TBI) ....
*/
if ((status&TREQ) != (last_status&TREQ)) {
#if (ADBDEBUG & ADBDEBUG_SRQ)
if (console_loglevel == 10)
printk("ADB: reply timeout, resending!\n");
#endif
/*
* first byte received should be the
* command byte timing out !!
*/
if (first_byte != 0xff)
command_byte = first_byte;
/*
* compute target for retransmit: if
* last_active is set, use that one,
* else use command_byte
*/
if (last_active == -1)
last_active = (command_byte&0xf0)>>4;
adb_state = idle;
/* resend if TALK, don't poll! */
if (current_req)
adb_start();
else
/*
* XXX: need to count the timeouts ??
* restart last active TALK ??
* If no current_req, reuse old one!
*/
adb_retransmit(last_active);
} else {
/*
* SRQ: NetBSD suggests /IRQ is asserted!?
*/
if (status&TREQ)
printk("ADB: SRQ signature w/o /INT!\n");
#if (ADBDEBUG & ADBDEBUG_SRQ)
if (console_loglevel == 10)
printk("ADB: empty SRQ packet!\n");
#endif
/* Terminate the SRQ packet and poll */
adb_state = idle;
adb_queue_poll();
}
/*
* Leave ADB status lines unchanged (means /IRQ
* will still be low when entering adb_start!)
*/
break;
}
/* end timeout / SRQ handling for II hw. */
if((reply_len-prefix_len)>3 && memcmp(reply_ptr-3,"\xFF\xFF\xFF",3)==0)
{
/* SRQ tacked on data packet */
/* Check /IRQ here ?? */
#if (ADBDEBUG & ADBDEBUG_SRQ)
if (console_loglevel == 10)
printk("\nADB: Packet with SRQ!\n");
#endif
/* Terminate the packet (SRQ never ends) */
x = via_read(via1, vSR);
adb_state = read_done;
reply_len -= 3;
reply_ptr -= 3;
need_poll = 1;
/* need to continue; next byte not seen else */
/*
* XXX: not at all sure here; maybe need to
* send away the reply and poll immediately?
*/
} else {
/* Sanity check */
if(reply_len>15)
reply_len=0;
/* read byte */
*reply_ptr = via_read(via1, vSR);
x = *reply_ptr;
#if (ADBDEBUG & ADBDEBUG_READ)
if (console_loglevel == 10)
printk(" %x (%x %x) ",
*reply_ptr, adb_state, status);
#endif
reply_ptr++;
reply_len++;
}
/* The usual handshake ... */
if (macintosh_config->adb_type==MAC_ADB_CUDA)
{
if (status == TIP)
{
/* that's all folks */
via_write(via1, vBufB,
via_read(via1, vBufB)|TACK|TIP);
adb_state = read_done;
}
else
{
/* assert status == TIP | TREQ */
if (status != TIP + TREQ)
printk("cuda: state=reading status=%x\n", status);
via_write(via1, vBufB,
via_read(via1, vBufB)^TACK);
}
}
else if (macintosh_config->adb_type==MAC_ADB_IISI)
{
/* ACK adb chip (maybe check for end first?) */
via_write(via1, vBufB, via_read(via1, vBufB) | TACK);
udelay(150);
via_write(via1, vBufB, via_read(via1, vBufB) & ~TACK);
/* end of frame?? */
if (status & TREQ)
{
#if (ADBDEBUG & ADBDEBUG_READ)
if (console_loglevel == 10)
printk("adb_IIsi: end of frame!\n");
#endif
/* that's all folks */
via_write(via1, vBufB,
via_read(via1, vBufB) & ~(TACK|TIP));
adb_state = read_done;
/* maybe process read_done here?? Handshake anyway?? */
}
}
else if (macintosh_config->adb_type==MAC_ADB_II)
{
/*
* NetBSD hints that the next to last byte
* is sent with IRQ !!
* Guido found out it's the last one (0x0),
* but IRQ should be asserted already.
* Problem with timeout detection: First
* transition to /IRQ might be second
* byte of timeout packet!
* Timeouts are signaled by 4x FF.
*/
if(!(status&TREQ) && x == 0x00) /* != 0xFF */
{
#if (ADBDEBUG & ADBDEBUG_READ)
if (console_loglevel == 10)
printk(" -> read done!\n");
#endif
#if 0 /* XXX: we take one more byte (why?), so handshake! */
/* set ADB state to idle */
via_write(via1, vBufB,
(via_read(via1, vBufB)&~ST_MASK)|ST_IDLE);
#else
/* invert state bits, toggle ODD/EVEN */
x = via_read(via1, vBufB);
via_write(via1, vBufB,
(x&~ST_MASK)|~(x&ST_MASK));
#endif
/* adjust packet length */
reply_len--;
reply_ptr--;
adb_state = read_done;
}
else
{
#if (ADBDEBUG & ADBDEBUG_STATUS)
if(status!=TIP+TREQ)
printk("macII_adb: state=reading status=%x\n", status);
#endif
/* not caught: ST_CMD */
/* required for re-entry 'reading'! */
if ((status&ST_MASK) == ST_IDLE) {
/* (in)sanity check - set even */
via_write(via1, vBufB,
(via_read(via1, vBufB)&~ST_MASK)|ST_EVEN);
} else {
/* invert state bits, toggle ODD/EVEN */
x = via_read(via1, vBufB);
via_write(via1, vBufB,
(x&~ST_MASK)|~(x&ST_MASK));
}
}
}
break;
case read_done:
x = via_read(via1, vSR);
#if (ADBDEBUG & ADBDEBUG_READ)
if (console_loglevel == 10)
printk("ADB: read done: %x (%x %x)!\n",
x, adb_state, status);
#endif
if (reading_reply)
{
req = current_req;
req->reply_len = reply_ptr - req->reply;
req->got_reply = 1;
current_req = req->next;
if (req->done)
(*req->done)(req);
}
else
{
adb_input(cuda_rbuf, reply_ptr - cuda_rbuf, regs);
}
/*
* remember this device ID; it's the latest we got a
* reply from!
*/
last_reply = command_byte;
last_active = (command_byte&0xf0)>>4;
/*
* Assert status = ST_IDLE ??
*/
/*
* SRQ seen before, initiate poll now
*/
if (need_poll) {
#if (ADBDEBUG & ADBDEBUG_POLL)
if (console_loglevel == 10)
printk("ADB: initiate poll!\n");
#endif
adb_state = idle;
/*
* set ADB status bits?? (unchanged above!)
*/
adb_queue_poll();
need_poll = 0;
/* hope this is ok; queue_poll runs adb_start */
break;
}
/*
* /IRQ seen, so the ADB controller has data for us
*/
if (!(status&TREQ))
{
/* set ADB state to idle */
via_write(via1, vBufB,
(via_read(via1, vBufB)&~ST_MASK)|ST_IDLE);
adb_state = reading;
reply_ptr = cuda_rbuf;
reply_len = 0;
prefix_len = 0;
if (macintosh_config->adb_type==MAC_ADB_II) {
*reply_ptr++ = ADB_PACKET;
*reply_ptr++ = command_byte;
reply_len = 2;
prefix_len = 2;
}
reading_reply = 0;
}
else
{
/*
* no IRQ, send next packet or wait
*/
adb_state = idle;
if (current_req)
adb_start();
else
adb_retransmit(last_active);
}
break;
default:
#if (ADBDEBUG & ADBDEBUG_STATE)
printk("adb_interrupt: unknown adb_state %d?\n", adb_state);
#endif
}
/* reset mutex and interrupts */
driver_running = 0;
restore_flags(flags);
}
/*
* Restart of CUDA support: please modify this interrupt handler while
* working at the Quadra etc. ADB driver. We can try to merge them later, or
* remove the CUDA stuff from the MacII handler
*
* MSch 27/01/98: Implemented IIsi driver based on initial code by Robert
* Thompson and hints from the NetBSD driver. CUDA and IIsi seem more closely
* related than to the MacII code, so merging all three might be a bad
* idea.
*/
void adb_cuda_interrupt(int irq, void *arg, struct pt_regs *regs)
{
int x, status;
struct adb_request *req;
unsigned long flags;
save_flags(flags);
cli();
if(macintosh_config->adb_type==MAC_ADB_CUDA)
status = (~via_read(via1, vBufB) & (TIP|TREQ)) | (via_read(via1, vACR) & SR_OUT);
else
status = via_read(via1, vBufB) & (TIP|TREQ);
#if (ADBDEBUG & ADBDEBUG_INT)
if (console_loglevel == 10)
printk("adb_interrupt: state=%d status=%x\n", adb_state, status);
#endif
switch (adb_state)
{
case idle:
first_byte = 0;
if(macintosh_config->adb_type==MAC_ADB_CUDA)
{
#if (ADBDEBUG & ADBDEBUG_STATUS)
/* CUDA has sent us the first byte of data - unsolicited */
if (status != TREQ)
printk("cuda: state=idle, status=%x want=%x\n",
status, TREQ);
#endif
x = via_read(via1, vSR);
#if (ADBDEBUG & ADBDEBUG_READ)
if (console_loglevel == 10)
printk("adb_cuda: receiving unsol. packet: %x (%x %x) ",
x, adb_state, status);
#endif
via_write(via1, vBufB, via_read(via1,vBufB)&~TIP);
}
else if(macintosh_config->adb_type==MAC_ADB_IISI)
{
udelay(150);
/* set SR to IN */
via_write(via1, vACR,via_read(via1, vACR)&~SR_OUT);
/* signal start of frame */
via_write(via1, vBufB, via_read(via1, vBufB) | TIP);
/* read first byte */
x = via_read(via1, vSR);
first_byte = x;
#if (ADBDEBUG & ADBDEBUG_READ)
if (console_loglevel == 10)
printk("adb_IIsi : receiving unsol. packet: %x (%x %x) ",
x, adb_state, status);
#endif
/* ACK adb chip */
via_write(via1, vBufB, via_read(via1, vBufB) | TACK);
udelay(150);
via_write(via1, vBufB, via_read(via1, vBufB) & ~TACK);
}
else if(macintosh_config->adb_type==MAC_ADB_II)
{
if (status != TREQ)
printk("adb_macII: state=idle status=%x want=%x\n",
status, TREQ);
x = via_read(via1, vSR);
via_write(via1, vBufB, via_read(via1, vBufB)&~(TIP|TACK));
}
adb_state = reading;
reply_ptr = cuda_rbuf;
reply_len = 0;
reading_reply = 0;
break;
case awaiting_reply:
if(macintosh_config->adb_type==MAC_ADB_CUDA)
{
/* CUDA has sent us the first byte of data of a reply */
#if (ADBDEBUG & ADBDEBUG_STATUS)
if (status != TREQ)
printk("cuda: state=awaiting_reply, status=%x want=%x\n",
status, TREQ);
#endif
x = via_read(via1, vSR);
#if (ADBDEBUG & ADBDEBUG_READ)
if (console_loglevel == 10)
printk("adb_cuda: reading reply: %x (%x %x) ",
x, adb_state, status);
#endif
via_write(via1,vBufB,
via_read(via1, vBufB)&~TIP);
}
else if(macintosh_config->adb_type==MAC_ADB_IISI)
{
/* udelay(150);*/
/* set SR to IN */
via_write(via1, vACR,via_read(via1, vACR)&~SR_OUT);
/* signal start of frame */
via_write(via1, vBufB, via_read(via1, vBufB) | TIP);
/* read first byte */
x = via_read(via1, vSR);
first_byte = x;
#if (ADBDEBUG & ADBDEBUG_READ)
if (console_loglevel == 10)
printk("adb_IIsi: reading reply: %x (%x %x) ",
x, adb_state, status);
#endif
#if 0
if( via_read(via1,vBufB) & TREQ)
ending = 1;
else
ending = 0;
#endif
/* ACK adb chip */
via_write(via1, vBufB, via_read(via1, vBufB) | TACK);
udelay(150);
via_write(via1, vBufB, via_read(via1, vBufB) & ~TACK);
}
adb_state = reading;
reply_ptr = current_req->reply;
reading_reply = 1;
reply_len = 0;
break;
case sent_first_byte:
if(macintosh_config->adb_type==MAC_ADB_CUDA)
{
#if (ADBDEBUG & ADBDEBUG_WRITE)
if (console_loglevel == 10)
printk(" sending: %x (%x %x) ",
current_req->data[1], adb_state, status);
#endif
if (status == TREQ + TIP + SR_OUT)
{
/* collision */
if (console_loglevel == 10)
printk("adb_cuda: send collision!\n");
via_write(via1, vACR,
via_read(via1, vACR)&~SR_OUT);
x = via_read(via1, vSR);
via_write(via1, vBufB,
via_read(via1,vBufB)|TIP|TACK);
adb_state = idle;
}
else
{
/* assert status == TIP + SR_OUT */
#if (ADBDEBUG & ADBDEBUG_STATUS)
if (status != TIP + SR_OUT)
printk("adb_cuda: state=sent_first_byte status=%x want=%x\n",
status, TIP + SR_OUT);
#endif
via_write(via1,vSR,current_req->data[1]);
via_write(via1, vBufB,
via_read(via1, vBufB)^TACK);
data_index = 2;
adb_state = sending;
}
}
else if(macintosh_config->adb_type==MAC_ADB_IISI)
{
/* switch ACK off */
via_write(via1, vBufB, via_read(via1, vBufB) & ~TACK);
if ( !(via_read(via1, vBufB) & TREQ) )
{
/* collision */
#if (ADBDEBUG & ADBDEBUG_WRITE)
if (console_loglevel == 10)
printk("adb_macIIsi: send collison, aborting!\n");
#endif
/* set shift in */
via_write(via1, vACR,
via_read(via1, vACR)&~SR_OUT);
/* clear SR int. */
x = via_read(via1, vSR);
/* set ADB state to 'idle' */
via_write(via1, vBufB,
via_read(via1,vBufB) & ~(TIP|TACK));
adb_state = idle;
}
else
{
/* delay */
udelay(ADB_DELAY);
/* set the shift register to shift out and send a byte */
#if 0
via_write(via1, vACR, via_read(via1, vACR) | SR_OUT);
#endif
via_write(via1, vSR, current_req->data[1]);
/* signal 'byte ready' */
via_write(via1, vBufB, via_read(via1, vBufB) | TACK);
data_index=2;
adb_state = sending;
}
}
else if(macintosh_config->adb_type==MAC_ADB_II)
{
if(status!=TIP+SR_OUT)
printk("adb_macII: state=send_first_byte status=%x want=%x\n",
status, TIP+SR_OUT);
via_write(via1, vSR, current_req->data[1]);
via_write(via1, vBufB,
via_read(via1, vBufB)^TACK);
data_index=2;
adb_state = sending;
}
break;
case sending:
req = current_req;
if (data_index >= req->nbytes)
{
#if (ADBDEBUG & ADBDEBUG_WRITE)
if (console_loglevel == 10)
printk(" -> end (%d of %d) (%x %x)!\n",
data_index-1, req->nbytes, adb_state, status);
#endif
if(macintosh_config->adb_type==MAC_ADB_CUDA)
{
via_write(via1, vACR,
via_read(via1, vACR)&~SR_OUT);
x = via_read(via1, vSR);
via_write(via1, vBufB,
via_read(via1,vBufB)|TACK|TIP);
}
else if(macintosh_config->adb_type==MAC_ADB_IISI)
{
/* XXX maybe clear ACK here ??? */
/* switch ACK off */
via_write(via1, vBufB, via_read(via1, vBufB) & ~TACK);
/* delay */
udelay(ADB_DELAY);
/* set the shift register to shift in */
via_write(via1, vACR, via_read(via1, vACR)|SR_OUT);
/* clear SR int. */
x = via_read(via1, vSR);
/* set ADB state 'idle' (end of frame) */
via_write(via1, vBufB,
via_read(via1,vBufB) & ~(TACK|TIP));
}
else if(macintosh_config->adb_type==MAC_ADB_II)
{
via_write(via1, vACR,
via_read(via1, vACR) & ~SR_OUT);
x=via_read(via1, vSR);
via_write(via1, vBufB,
via_read(via1, vBufB)|TACK|TIP);
}
req->sent = 1;
if (req->reply_expected)
{
/*
* maybe fake a reply here on Listen ??
* Otherwise, a Listen hangs on success
* CUDA+IIsi: only ADB Talk considered
* RTC/PRAM read (0x1 0x3) to follow.
*/
if ( (req->data[0] == 0x0) && ((req->data[1]&0xc) == 0xc) )
adb_state = awaiting_reply;
else {
/*
* Reply expected, but none
* possible -> fake reply.
*/
#if (ADBDEBUG & ADBDEBUG_PROT)
printk("ADB: reply expected on Listen, faking reply\n");
#endif
/* make it look weird */
/* XXX: return reply_len -1? */
/* XXX: fake ADB header? */
req->reply[0] = req->reply[1] = req->reply[2] = 0xFF;
req->reply_len = 3;
req->got_reply = 1;
current_req = req->next;
if (req->done)
(*req->done)(req);
/*
* ready with this one, run
* next command !
*/
/* set state to idle !! */
adb_state = idle;
if (current_req || retry_req)
adb_start();
}
}
else
{
current_req = req->next;
if (req->done)
(*req->done)(req);
/* not sure about this */
adb_state = idle;
adb_start();
}
}
else
{
#if (ADBDEBUG & ADBDEBUG_WRITE)
if (console_loglevel == 10)
printk(" %x (%x %x) ",
req->data[data_index], adb_state, status);
#endif
if(macintosh_config->adb_type==MAC_ADB_CUDA)
{
via_write(via1, vSR, req->data[data_index++]);
via_write(via1, vBufB,
via_read(via1, vBufB)^TACK);
}
else if(macintosh_config->adb_type==MAC_ADB_IISI)
{
/* switch ACK off */
via_write(via1, vBufB, via_read(via1, vBufB) & ~TACK);
/* delay */
udelay(ADB_DELAY);
/* XXX: need to check for collision?? */
/* set the shift register to shift out and send a byte */
#if 0
via_write(via1, vACR, via_read(via1, vACR)|SR_OUT);
#endif
via_write(via1, vSR, req->data[data_index++]);
/* signal 'byte ready' */
via_write(via1, vBufB, via_read(via1, vBufB) | TACK);
}
else if(macintosh_config->adb_type==MAC_ADB_II)
{
via_write(via1, vSR, req->data[data_index++]);
via_write(via1, vBufB,
via_read(via1, vBufB)^TACK);
}
}
break;
case reading:
if(reply_len==3 && memcmp(reply_ptr-3,"\xFF\xFF\xFF",3)==0)
{
/* Terminate the SRQ packet */
#if (ADBDEBUG & ADBDEBUG_SRQ)
if (console_loglevel == 10)
printk("adb: Got an SRQ\n");
#endif
adb_state = idle;
adb_queue_poll();
break;
}
/* Sanity check - botched in orig. code! */
if(reply_len>15) {
printk("adb_cuda: reply buffer overrun!\n");
/* wrap buffer */
reply_len=0;
if (reading_reply)
reply_ptr = current_req->reply;
else
reply_ptr = cuda_rbuf;
}
*reply_ptr = via_read(via1, vSR);
#if (ADBDEBUG & ADBDEBUG_READ)
if (console_loglevel == 10)
printk(" %x (%x %x) ",
*reply_ptr, adb_state, status);
#endif
reply_ptr++;
reply_len++;
if(macintosh_config->adb_type==MAC_ADB_CUDA)
{
if (status == TIP)
{
/* that's all folks */
via_write(via1, vBufB,
via_read(via1, vBufB)|TACK|TIP);
adb_state = read_done;
}
else
{
/* assert status == TIP | TREQ */
#if (ADBDEBUG & ADBDEBUG_STATUS)
if (status != TIP + TREQ)
printk("cuda: state=reading status=%x want=%x\n",
status, TIP + TREQ);
#endif
via_write(via1, vBufB,
via_read(via1, vBufB)^TACK);
}
}
else if (macintosh_config->adb_type==MAC_ADB_IISI)
{
/* ACK adb chip (maybe check for end first?) */
via_write(via1, vBufB, via_read(via1, vBufB) | TACK);
udelay(150);
via_write(via1, vBufB, via_read(via1, vBufB) & ~TACK);
/* end of frame?? */
if (status & TREQ)
{
#if (ADBDEBUG & ADBDEBUG_READ)
if (console_loglevel == 10)
printk("adb_IIsi: end of frame!\n");
#endif
/* that's all folks */
via_write(via1, vBufB,
via_read(via1, vBufB) & ~(TACK|TIP));
adb_state = read_done;
/* XXX maybe process read_done here??
Handshake anyway?? */
}
}
if(macintosh_config->adb_type==MAC_ADB_II)
{
if( status == TIP)
{
via_write(via1, vBufB,
via_read(via1, vBufB)|TACK|TIP);
adb_state = read_done;
}
else
{
#if (ADBDEBUG & ADBDEBUG_STATUS)
if(status!=TIP+TREQ)
printk("macII_adb: state=reading status=%x\n", status);
#endif
via_write(via1, vBufB,
via_read(via1, vBufB)^TACK);
}
}
/* fall through for IIsi on end of frame */
if (macintosh_config->adb_type != MAC_ADB_IISI
|| adb_state != read_done)
break;
case read_done:
x = via_read(via1, vSR);
#if (ADBDEBUG & ADBDEBUG_READ)
if (console_loglevel == 10)
printk("adb: read done: %x (%x %x)!\n",
x, adb_state, status);
#endif
if (reading_reply)
{
req = current_req;
req->reply_len = reply_ptr - req->reply;
req->got_reply = 1;
current_req = req->next;
if (req->done)
(*req->done)(req);
}
else
{
adb_input(cuda_rbuf, reply_ptr - cuda_rbuf, regs);
}
if (macintosh_config->adb_type==MAC_ADB_CUDA
&& status & TREQ)
{
via_write(via1, vBufB,
via_read(via1, vBufB)&~TIP);
adb_state = reading;
reply_ptr = cuda_rbuf;
reading_reply = 0;
}
else if (macintosh_config->adb_type==MAC_ADB_IISI
&& !(status & TREQ))
{
udelay(150);
via_write(via1, vBufB,
via_read(via1, vBufB) | TIP);
adb_state = reading;
reply_ptr = cuda_rbuf;
reading_reply = 0;
}
else
{
adb_state = idle;
adb_start();
}
break;
default:
printk("adb_cuda_interrupt: unknown adb_state %d?\n", adb_state);
}
restore_flags(flags);
}
/*
* The 'reply delivery' routine; determines which device sent the
* request and calls the appropriate handler.
* Reply data are expected in CUDA format (again, argh...) so we need
* to fake this in the interrupt handler for MacII.
* Only one handler per device ID is currently possible.
* XXX: is the ID field here representing the default or real ID?
*/
static void adb_input(unsigned char *buf, int nb, struct pt_regs *regs)
{
int i, id;
switch (buf[0])
{
case ADB_PACKET:
/* what's in buf[1] ?? */
id = buf[2] >> 4;
#if 0
xmon_printf("adb packet: ");
for (i = 0; i < nb; ++i)
xmon_printf(" %x", buf[i]);
xmon_printf(", id = %d\n", id);
#endif
#if (ADBDEBUG & ADBDEBUG_INPUT)
if (console_loglevel == 10) {
printk("adb_input: adb packet ");
for (i = 0; i < nb; ++i)
printk(" %x", buf[i]);
printk(", id = %d\n", id);
}
#endif
if (adb_handler[id].handler != 0)
{
(*adb_handler[id].handler)(buf, nb, regs);
}
break;
default:
#if (ADBDEBUG & ADBDEBUG_INPUT)
if (console_loglevel == 10) {
printk("adb_input: data from via (%d bytes):", nb);
for (i = 0; i < nb; ++i)
printk(" %.2x", buf[i]);
printk("\n");
}
#endif
}
}
/* Ultimately this should return the number of devices with
the given default id. */
int adb_register(int default_id,
void (*handler)(unsigned char *, int, struct pt_regs *))
{
if (adb_handler[default_id].handler != 0)
panic("Two handlers for ADB device %d\n", default_id);
adb_handler[default_id].handler = handler;
return 1;
}
/*
* /dev/adb device driver.
*/
#define ADB_MAJOR 56 /* major number for /dev/adb */
#define ADB_MAX_MINOR 64 /* range of ADB minors */
#define ADB_TYPE_SHIFT 4 /* # bits for device ID/type in subdevices */
#define ADB_TYPE_RAW 0 /* raw device; unbuffered */
#define ADB_TYPE_BUFF 1 /* raw device; buffered */
#define ADB_TYPE_COOKED 2 /* 'cooked' device */
extern void adbdev_init(void);
struct adbdev_state {
struct adb_request req;
};
static DECLARE_WAIT_QUEUE_HEAD(adb_wait);
static int adb_wait_reply(struct adbdev_state *state, struct file *file)
{
int ret = 0;
DECLARE_WAITQUEUE(wait,current);
add_wait_queue(&adb_wait, &wait);
current->state = TASK_INTERRUPTIBLE;
while (!state->req.got_reply) {
if (file->f_flags & O_NONBLOCK) {
ret = -EAGAIN;
break;
}
if (signal_pending(current)) {
ret = -ERESTARTSYS;
break;
}
schedule();
}
current->state = TASK_RUNNING;
remove_wait_queue(&adb_wait, &wait);
return ret;
}
static void adb_write_done(struct adb_request *req)
{
if (!req->got_reply) {
req->reply_len = 0;
req->got_reply = 1;
}
wake_up_interruptible(&adb_wait);
}
struct file_operations *adb_raw[16];
struct file_operations *adb_buffered[16];
struct file_operations *adb_cooked[16];
static int adb_open(struct inode *inode, struct file *file)
{
int adb_type, adb_subtype;
struct adbdev_state *state;
if (MINOR(inode->i_rdev) > ADB_MAX_MINOR)
return -ENXIO;
switch (MINOR(inode->i_rdev) >> ADB_TYPE_SHIFT) {
case ADB_TYPE_RAW:
/* see code below */
break;
case ADB_TYPE_BUFF:
/* TBI */
return -ENXIO;
case ADB_TYPE_COOKED:
/* subtypes such as kbd, mouse, ... */
adb_subtype = MINOR(inode->i_rdev) & ~ADB_TYPE_SHIFT;
if ((file->f_op = adb_cooked[adb_subtype]))
return file->f_op->open(inode,file);
else
return -ENODEV;
}
state = kmalloc(sizeof(struct adbdev_state), GFP_KERNEL);
if (state == 0)
return -ENOMEM;
file->private_data = state;
state->req.reply_expected = 0;
return 0;
}
static void adb_release(struct inode *inode, struct file *file)
{
struct adbdev_state *state = file->private_data;
if (state) {
file->private_data = NULL;
if (state->req.reply_expected && !state->req.got_reply)
if (adb_wait_reply(state, file))
return;
kfree(state);
}
return;
}
static int adb_lseek(struct inode *inode, struct file *file,
off_t offset, int origin)
{
return -ESPIPE;
}
static int adb_read(struct inode *inode, struct file *file,
char *buf, int count)
{
int ret;
struct adbdev_state *state = file->private_data;
if (count < 2)
return -EINVAL;
if (count > sizeof(state->req.reply))
count = sizeof(state->req.reply);
ret = verify_area(VERIFY_WRITE, buf, count);
if (ret)
return ret;
if (!state->req.reply_expected)
return 0;
ret = adb_wait_reply(state, file);
if (ret)
return ret;
state->req.reply_expected = 0;
ret = state->req.reply_len;
copy_to_user(buf, state->req.reply, ret);
return ret;
}
static int adb_write(struct inode *inode, struct file *file,
const char *buf, int count)
{
int ret, i;
struct adbdev_state *state = file->private_data;
if (count < 2 || count > sizeof(state->req.data))
return -EINVAL;
ret = verify_area(VERIFY_READ, buf, count);
if (ret)
return ret;
if (state->req.reply_expected && !state->req.got_reply) {
/* A previous request is still being processed.
Wait for it to finish. */
ret = adb_wait_reply(state, file);
if (ret)
return ret;
}
state->req.nbytes = count;
state->req.done = adb_write_done;
state->req.got_reply = 0;
copy_from_user(state->req.data, buf, count);
#if 0
switch (adb_hardware) {
case ADB_NONE:
return -ENXIO;
case ADB_VIACUDA:
state->req.reply_expected = 1;
cuda_send_request(&state->req);
break;
default:
#endif
if (state->req.data[0] != ADB_PACKET)
return -EINVAL;
for (i = 1; i < state->req.nbytes; ++i)
state->req.data[i] = state->req.data[i+1];
state->req.reply_expected =
((state->req.data[0] & 0xc) == 0xc);
adb_send_request(&state->req);
#if 0
break;
}
#endif
return count;
}
static struct file_operations adb_fops = {
adb_lseek,
adb_read,
adb_write,
NULL, /* no readdir */
NULL, /* no poll yet */
NULL, /* no ioctl yet */
NULL, /* no mmap */
adb_open,
NULL, /* flush */
adb_release
};
int adbdev_register(int subtype, struct file_operations *fops)
{
if (subtype < 0 || subtype > 15)
return -EINVAL;
if (adb_cooked[subtype])
return -EBUSY;
adb_cooked[subtype] = fops;
return 0;
}
int adbdev_unregister(int subtype)
{
if (subtype < 0 || subtype > 15)
return -EINVAL;
if (!adb_cooked[subtype])
return -ENODEV;
adb_cooked[subtype] = NULL;
return 0;
}
void adbdev_init()
{
if (register_chrdev(ADB_MAJOR, "adb", &adb_fops))
printk(KERN_ERR "adb: unable to get major %d\n", ADB_MAJOR);
}
#if 0 /* old ADB device */
/*
* Here are the file operations we export for /dev/adb.
*/
#define ADB_MINOR 140 /* /dev/adb is c 10 140 */
extern void adbdev_inits(void);
struct adbdev_state {
struct adb_request req;
};
static DECLARE_WAIT_QUEUE_HEAD(adb_wait);
static int adb_wait_reply(struct adbdev_state *state, struct file *file)
{
int ret = 0;
DECLARE_WAITQUEUE(wait, current);
#if (ADBDEBUG & ADBDEBUG_DEVICE)
printk("ADB request: wait_reply (blocking ... \n");
#endif
add_wait_queue(&adb_wait, &wait);
current->state = TASK_INTERRUPTIBLE;
while (!state->req.got_reply) {
if (file->f_flags & O_NONBLOCK) {
ret = -EAGAIN;
break;
}
if (signal_pending(current)) {
ret = -ERESTARTSYS;
break;
}
schedule();
}
current->state = TASK_RUNNING;
remove_wait_queue(&adb_wait, &wait);
return ret;
}
static void adb_write_done(struct adb_request *req)
{
if (!req->got_reply) {
req->reply_len = 0;
req->got_reply = 1;
}
wake_up_interruptible(&adb_wait);
}
static int adb_open(struct inode *inode, struct file *file)
{
struct adbdev_state *state;
state = kmalloc(sizeof(struct adbdev_state), GFP_KERNEL);
if (state == 0)
return -ENOMEM;
file->private_data = state;
state->req.reply_expected = 0;
return 0;
}
static void adb_release(struct inode *inode, struct file *file)
{
struct adbdev_state *state = file->private_data;
if (state) {
file->private_data = NULL;
if (state->req.reply_expected && !state->req.got_reply)
if (adb_wait_reply(state, file))
return;
kfree(state);
}
return;
}
static int adb_lseek(struct inode *inode, struct file *file,
off_t offset, int origin)
{
return -ESPIPE;
}
static int adb_read(struct inode *inode, struct file *file,
char *buf, int count)
{
int ret;
struct adbdev_state *state = file->private_data;
if (count < 2)
return -EINVAL;
if (count > sizeof(state->req.reply))
count = sizeof(state->req.reply);
ret = verify_area(VERIFY_WRITE, buf, count);
if (ret)
return ret;
if (!state->req.reply_expected)
return 0;
ret = adb_wait_reply(state, file);
if (ret)
return ret;
ret = state->req.reply_len;
memcpy_tofs(buf, state->req.reply, ret);
state->req.reply_expected = 0;
return ret;
}
static int adb_write(struct inode *inode, struct file *file,
const char *buf, int count)
{
int ret;
struct adbdev_state *state = file->private_data;
if (count < 2 || count > sizeof(state->req.data))
return -EINVAL;
ret = verify_area(VERIFY_READ, buf, count);
if (ret)
return ret;
if (state->req.reply_expected && !state->req.got_reply) {
/* A previous request is still being processed.
Wait for it to finish. */
ret = adb_wait_reply(state, file);
if (ret)
return ret;
}
state->req.nbytes = count;
state->req.done = adb_write_done;
memcpy_fromfs(state->req.data, buf, count);
state->req.reply_expected = 1;
state->req.got_reply = 0;
adb_send_request(&state->req);
return count;
}
static struct file_operations adb_fops = {
adb_lseek,
adb_read,
adb_write,
NULL, /* no readdir */
NULL, /* no select */
NULL, /* no ioctl */
NULL, /* no mmap */
adb_open,
NULL, /* flush */
adb_release
};
static struct miscdevice adb_dev = {
ADB_MINOR,
"adb",
&adb_fops
};
void adbdev_init(void)
{
misc_register(&adb_dev);
}
#endif /* old ADB device */
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