628 lines
16 KiB
C
628 lines
16 KiB
C
/*
|
|
* Device driver for the via-cuda on Apple Powermacs.
|
|
*
|
|
* The VIA (versatile interface adapter) interfaces to the CUDA,
|
|
* a 6805 microprocessor core which controls the ADB (Apple Desktop
|
|
* Bus) which connects to the keyboard and mouse. The CUDA also
|
|
* controls system power and the RTC (real time clock) chip.
|
|
*
|
|
* Copyright (C) 1996 Paul Mackerras.
|
|
*/
|
|
#include <stdarg.h>
|
|
#include <linux/config.h>
|
|
#include <linux/types.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/adb.h>
|
|
#include <linux/cuda.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/interrupt.h>
|
|
#ifdef CONFIG_PPC
|
|
#include <asm/prom.h>
|
|
#include <asm/machdep.h>
|
|
#else
|
|
#include <asm/macintosh.h>
|
|
#include <asm/macints.h>
|
|
#include <asm/machw.h>
|
|
#include <asm/mac_via.h>
|
|
#endif
|
|
#include <asm/io.h>
|
|
#include <asm/system.h>
|
|
#include <linux/init.h>
|
|
|
|
static volatile unsigned char __iomem *via;
|
|
static DEFINE_SPINLOCK(cuda_lock);
|
|
|
|
#ifdef CONFIG_MAC
|
|
#define CUDA_IRQ IRQ_MAC_ADB
|
|
#define eieio()
|
|
#else
|
|
#define CUDA_IRQ vias->intrs[0].line
|
|
#endif
|
|
|
|
/* VIA registers - spaced 0x200 bytes apart */
|
|
#define RS 0x200 /* skip between registers */
|
|
#define B 0 /* B-side data */
|
|
#define A RS /* A-side data */
|
|
#define DIRB (2*RS) /* B-side direction (1=output) */
|
|
#define DIRA (3*RS) /* A-side direction (1=output) */
|
|
#define T1CL (4*RS) /* Timer 1 ctr/latch (low 8 bits) */
|
|
#define T1CH (5*RS) /* Timer 1 counter (high 8 bits) */
|
|
#define T1LL (6*RS) /* Timer 1 latch (low 8 bits) */
|
|
#define T1LH (7*RS) /* Timer 1 latch (high 8 bits) */
|
|
#define T2CL (8*RS) /* Timer 2 ctr/latch (low 8 bits) */
|
|
#define T2CH (9*RS) /* Timer 2 counter (high 8 bits) */
|
|
#define SR (10*RS) /* Shift register */
|
|
#define ACR (11*RS) /* Auxiliary control register */
|
|
#define PCR (12*RS) /* Peripheral control register */
|
|
#define IFR (13*RS) /* Interrupt flag register */
|
|
#define IER (14*RS) /* Interrupt enable register */
|
|
#define ANH (15*RS) /* A-side data, no handshake */
|
|
|
|
/* 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 ACR */
|
|
#define SR_CTRL 0x1c /* Shift register control bits */
|
|
#define SR_EXT 0x0c /* Shift on external clock */
|
|
#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 */
|
|
|
|
static enum cuda_state {
|
|
idle,
|
|
sent_first_byte,
|
|
sending,
|
|
reading,
|
|
read_done,
|
|
awaiting_reply
|
|
} cuda_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 reading_reply;
|
|
static int data_index;
|
|
#ifdef CONFIG_PPC
|
|
static struct device_node *vias;
|
|
#endif
|
|
static int cuda_fully_inited = 0;
|
|
|
|
#ifdef CONFIG_ADB
|
|
static int cuda_probe(void);
|
|
static int cuda_init(void);
|
|
static int cuda_send_request(struct adb_request *req, int sync);
|
|
static int cuda_adb_autopoll(int devs);
|
|
static int cuda_reset_adb_bus(void);
|
|
#endif /* CONFIG_ADB */
|
|
|
|
static int cuda_init_via(void);
|
|
static void cuda_start(void);
|
|
static irqreturn_t cuda_interrupt(int irq, void *arg, struct pt_regs *regs);
|
|
static void cuda_input(unsigned char *buf, int nb, struct pt_regs *regs);
|
|
void cuda_poll(void);
|
|
static int cuda_write(struct adb_request *req);
|
|
|
|
int cuda_request(struct adb_request *req,
|
|
void (*done)(struct adb_request *), int nbytes, ...);
|
|
|
|
#ifdef CONFIG_ADB
|
|
struct adb_driver via_cuda_driver = {
|
|
"CUDA",
|
|
cuda_probe,
|
|
cuda_init,
|
|
cuda_send_request,
|
|
cuda_adb_autopoll,
|
|
cuda_poll,
|
|
cuda_reset_adb_bus
|
|
};
|
|
#endif /* CONFIG_ADB */
|
|
|
|
#ifdef CONFIG_PPC
|
|
int __init
|
|
find_via_cuda(void)
|
|
{
|
|
int err;
|
|
struct adb_request req;
|
|
|
|
if (vias != 0)
|
|
return 1;
|
|
vias = find_devices("via-cuda");
|
|
if (vias == 0)
|
|
return 0;
|
|
if (vias->next != 0)
|
|
printk(KERN_WARNING "Warning: only using 1st via-cuda\n");
|
|
|
|
#if 0
|
|
{ int i;
|
|
|
|
printk("find_via_cuda: node = %p, addrs =", vias->node);
|
|
for (i = 0; i < vias->n_addrs; ++i)
|
|
printk(" %x(%x)", vias->addrs[i].address, vias->addrs[i].size);
|
|
printk(", intrs =");
|
|
for (i = 0; i < vias->n_intrs; ++i)
|
|
printk(" %x", vias->intrs[i].line);
|
|
printk("\n"); }
|
|
#endif
|
|
|
|
if (vias->n_addrs != 1 || vias->n_intrs != 1) {
|
|
printk(KERN_ERR "via-cuda: expecting 1 address (%d) and 1 interrupt (%d)\n",
|
|
vias->n_addrs, vias->n_intrs);
|
|
if (vias->n_addrs < 1 || vias->n_intrs < 1)
|
|
return 0;
|
|
}
|
|
via = ioremap(vias->addrs->address, 0x2000);
|
|
|
|
cuda_state = idle;
|
|
sys_ctrler = SYS_CTRLER_CUDA;
|
|
|
|
err = cuda_init_via();
|
|
if (err) {
|
|
printk(KERN_ERR "cuda_init_via() failed\n");
|
|
via = NULL;
|
|
return 0;
|
|
}
|
|
|
|
/* Clear and enable interrupts, but only on PPC. On 68K it's done */
|
|
/* for us by the main VIA driver in arch/m68k/mac/via.c */
|
|
|
|
#ifndef CONFIG_MAC
|
|
out_8(&via[IFR], 0x7f); /* clear interrupts by writing 1s */
|
|
out_8(&via[IER], IER_SET|SR_INT); /* enable interrupt from SR */
|
|
#endif
|
|
|
|
/* enable autopoll */
|
|
cuda_request(&req, NULL, 3, CUDA_PACKET, CUDA_AUTOPOLL, 1);
|
|
while (!req.complete)
|
|
cuda_poll();
|
|
|
|
return 1;
|
|
}
|
|
#endif /* CONFIG_PPC */
|
|
|
|
static int __init via_cuda_start(void)
|
|
{
|
|
if (via == NULL)
|
|
return -ENODEV;
|
|
|
|
#ifdef CONFIG_PPC
|
|
request_OF_resource(vias, 0, NULL);
|
|
#endif
|
|
|
|
if (request_irq(CUDA_IRQ, cuda_interrupt, 0, "ADB", cuda_interrupt)) {
|
|
printk(KERN_ERR "cuda_init: can't get irq %d\n", CUDA_IRQ);
|
|
return -EAGAIN;
|
|
}
|
|
|
|
printk("Macintosh CUDA driver v0.5 for Unified ADB.\n");
|
|
|
|
cuda_fully_inited = 1;
|
|
return 0;
|
|
}
|
|
|
|
device_initcall(via_cuda_start);
|
|
|
|
#ifdef CONFIG_ADB
|
|
static int
|
|
cuda_probe(void)
|
|
{
|
|
#ifdef CONFIG_PPC
|
|
if (sys_ctrler != SYS_CTRLER_CUDA)
|
|
return -ENODEV;
|
|
#else
|
|
if (macintosh_config->adb_type != MAC_ADB_CUDA)
|
|
return -ENODEV;
|
|
via = via1;
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
static int __init
|
|
cuda_init(void)
|
|
{
|
|
#ifdef CONFIG_PPC
|
|
if (via == NULL)
|
|
return -ENODEV;
|
|
return 0;
|
|
#else
|
|
int err = cuda_init_via();
|
|
if (err) {
|
|
printk(KERN_ERR "cuda_init_via() failed\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
return via_cuda_start();
|
|
#endif
|
|
}
|
|
#endif /* CONFIG_ADB */
|
|
|
|
#define WAIT_FOR(cond, what) \
|
|
do { \
|
|
int x; \
|
|
for (x = 1000; !(cond); --x) { \
|
|
if (x == 0) { \
|
|
printk("Timeout waiting for " what "\n"); \
|
|
return -ENXIO; \
|
|
} \
|
|
udelay(100); \
|
|
} \
|
|
} while (0)
|
|
|
|
static int
|
|
cuda_init_via(void)
|
|
{
|
|
out_8(&via[DIRB], (in_8(&via[DIRB]) | TACK | TIP) & ~TREQ); /* TACK & TIP out */
|
|
out_8(&via[B], in_8(&via[B]) | TACK | TIP); /* negate them */
|
|
out_8(&via[ACR] ,(in_8(&via[ACR]) & ~SR_CTRL) | SR_EXT); /* SR data in */
|
|
(void)in_8(&via[SR]); /* clear any left-over data */
|
|
#ifndef CONFIG_MAC
|
|
out_8(&via[IER], 0x7f); /* disable interrupts from VIA */
|
|
(void)in_8(&via[IER]);
|
|
#endif
|
|
|
|
/* delay 4ms and then clear any pending interrupt */
|
|
mdelay(4);
|
|
(void)in_8(&via[SR]);
|
|
out_8(&via[IFR], in_8(&via[IFR]) & 0x7f);
|
|
|
|
/* sync with the CUDA - assert TACK without TIP */
|
|
out_8(&via[B], in_8(&via[B]) & ~TACK);
|
|
|
|
/* wait for the CUDA to assert TREQ in response */
|
|
WAIT_FOR((in_8(&via[B]) & TREQ) == 0, "CUDA response to sync");
|
|
|
|
/* wait for the interrupt and then clear it */
|
|
WAIT_FOR(in_8(&via[IFR]) & SR_INT, "CUDA response to sync (2)");
|
|
(void)in_8(&via[SR]);
|
|
out_8(&via[IFR], in_8(&via[IFR]) & 0x7f);
|
|
|
|
/* finish the sync by negating TACK */
|
|
out_8(&via[B], in_8(&via[B]) | TACK);
|
|
|
|
/* wait for the CUDA to negate TREQ and the corresponding interrupt */
|
|
WAIT_FOR(in_8(&via[B]) & TREQ, "CUDA response to sync (3)");
|
|
WAIT_FOR(in_8(&via[IFR]) & SR_INT, "CUDA response to sync (4)");
|
|
(void)in_8(&via[SR]);
|
|
out_8(&via[IFR], in_8(&via[IFR]) & 0x7f);
|
|
out_8(&via[B], in_8(&via[B]) | TIP); /* should be unnecessary */
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_ADB
|
|
/* Send an ADB command */
|
|
static int
|
|
cuda_send_request(struct adb_request *req, int sync)
|
|
{
|
|
int i;
|
|
|
|
if ((via == NULL) || !cuda_fully_inited) {
|
|
req->complete = 1;
|
|
return -ENXIO;
|
|
}
|
|
|
|
req->reply_expected = 1;
|
|
|
|
i = cuda_write(req);
|
|
if (i)
|
|
return i;
|
|
|
|
if (sync) {
|
|
while (!req->complete)
|
|
cuda_poll();
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* Enable/disable autopolling */
|
|
static int
|
|
cuda_adb_autopoll(int devs)
|
|
{
|
|
struct adb_request req;
|
|
|
|
if ((via == NULL) || !cuda_fully_inited)
|
|
return -ENXIO;
|
|
|
|
cuda_request(&req, NULL, 3, CUDA_PACKET, CUDA_AUTOPOLL, (devs? 1: 0));
|
|
while (!req.complete)
|
|
cuda_poll();
|
|
return 0;
|
|
}
|
|
|
|
/* Reset adb bus - how do we do this?? */
|
|
static int
|
|
cuda_reset_adb_bus(void)
|
|
{
|
|
struct adb_request req;
|
|
|
|
if ((via == NULL) || !cuda_fully_inited)
|
|
return -ENXIO;
|
|
|
|
cuda_request(&req, NULL, 2, ADB_PACKET, 0); /* maybe? */
|
|
while (!req.complete)
|
|
cuda_poll();
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_ADB */
|
|
/* Construct and send a cuda request */
|
|
int
|
|
cuda_request(struct adb_request *req, void (*done)(struct adb_request *),
|
|
int nbytes, ...)
|
|
{
|
|
va_list list;
|
|
int i;
|
|
|
|
if (via == NULL) {
|
|
req->complete = 1;
|
|
return -ENXIO;
|
|
}
|
|
|
|
req->nbytes = nbytes;
|
|
req->done = done;
|
|
va_start(list, nbytes);
|
|
for (i = 0; i < nbytes; ++i)
|
|
req->data[i] = va_arg(list, int);
|
|
va_end(list);
|
|
req->reply_expected = 1;
|
|
return cuda_write(req);
|
|
}
|
|
|
|
static int
|
|
cuda_write(struct adb_request *req)
|
|
{
|
|
unsigned long flags;
|
|
|
|
if (req->nbytes < 2 || req->data[0] > CUDA_PACKET) {
|
|
req->complete = 1;
|
|
return -EINVAL;
|
|
}
|
|
req->next = NULL;
|
|
req->sent = 0;
|
|
req->complete = 0;
|
|
req->reply_len = 0;
|
|
|
|
spin_lock_irqsave(&cuda_lock, flags);
|
|
if (current_req != 0) {
|
|
last_req->next = req;
|
|
last_req = req;
|
|
} else {
|
|
current_req = req;
|
|
last_req = req;
|
|
if (cuda_state == idle)
|
|
cuda_start();
|
|
}
|
|
spin_unlock_irqrestore(&cuda_lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
cuda_start(void)
|
|
{
|
|
struct adb_request *req;
|
|
|
|
/* assert cuda_state == idle */
|
|
/* get the packet to send */
|
|
req = current_req;
|
|
if (req == 0)
|
|
return;
|
|
if ((in_8(&via[B]) & TREQ) == 0)
|
|
return; /* a byte is coming in from the CUDA */
|
|
|
|
/* set the shift register to shift out and send a byte */
|
|
out_8(&via[ACR], in_8(&via[ACR]) | SR_OUT);
|
|
out_8(&via[SR], req->data[0]);
|
|
out_8(&via[B], in_8(&via[B]) & ~TIP);
|
|
cuda_state = sent_first_byte;
|
|
}
|
|
|
|
void
|
|
cuda_poll(void)
|
|
{
|
|
unsigned long flags;
|
|
|
|
/* cuda_interrupt only takes a normal lock, we disable
|
|
* interrupts here to avoid re-entering and thus deadlocking.
|
|
* An option would be to disable only the IRQ source with
|
|
* disable_irq(), would that work on m68k ? --BenH
|
|
*/
|
|
local_irq_save(flags);
|
|
cuda_interrupt(0, NULL, NULL);
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
static irqreturn_t
|
|
cuda_interrupt(int irq, void *arg, struct pt_regs *regs)
|
|
{
|
|
int status;
|
|
struct adb_request *req = NULL;
|
|
unsigned char ibuf[16];
|
|
int ibuf_len = 0;
|
|
int complete = 0;
|
|
unsigned char virq;
|
|
|
|
spin_lock(&cuda_lock);
|
|
|
|
virq = in_8(&via[IFR]) & 0x7f;
|
|
out_8(&via[IFR], virq);
|
|
if ((virq & SR_INT) == 0) {
|
|
spin_unlock(&cuda_lock);
|
|
return IRQ_NONE;
|
|
}
|
|
|
|
status = (~in_8(&via[B]) & (TIP|TREQ)) | (in_8(&via[ACR]) & SR_OUT);
|
|
/* printk("cuda_interrupt: state=%d status=%x\n", cuda_state, status); */
|
|
switch (cuda_state) {
|
|
case idle:
|
|
/* CUDA has sent us the first byte of data - unsolicited */
|
|
if (status != TREQ)
|
|
printk("cuda: state=idle, status=%x\n", status);
|
|
(void)in_8(&via[SR]);
|
|
out_8(&via[B], in_8(&via[B]) & ~TIP);
|
|
cuda_state = reading;
|
|
reply_ptr = cuda_rbuf;
|
|
reading_reply = 0;
|
|
break;
|
|
|
|
case awaiting_reply:
|
|
/* CUDA has sent us the first byte of data of a reply */
|
|
if (status != TREQ)
|
|
printk("cuda: state=awaiting_reply, status=%x\n", status);
|
|
(void)in_8(&via[SR]);
|
|
out_8(&via[B], in_8(&via[B]) & ~TIP);
|
|
cuda_state = reading;
|
|
reply_ptr = current_req->reply;
|
|
reading_reply = 1;
|
|
break;
|
|
|
|
case sent_first_byte:
|
|
if (status == TREQ + TIP + SR_OUT) {
|
|
/* collision */
|
|
out_8(&via[ACR], in_8(&via[ACR]) & ~SR_OUT);
|
|
(void)in_8(&via[SR]);
|
|
out_8(&via[B], in_8(&via[B]) | TIP | TACK);
|
|
cuda_state = idle;
|
|
} else {
|
|
/* assert status == TIP + SR_OUT */
|
|
if (status != TIP + SR_OUT)
|
|
printk("cuda: state=sent_first_byte status=%x\n", status);
|
|
out_8(&via[SR], current_req->data[1]);
|
|
out_8(&via[B], in_8(&via[B]) ^ TACK);
|
|
data_index = 2;
|
|
cuda_state = sending;
|
|
}
|
|
break;
|
|
|
|
case sending:
|
|
req = current_req;
|
|
if (data_index >= req->nbytes) {
|
|
out_8(&via[ACR], in_8(&via[ACR]) & ~SR_OUT);
|
|
(void)in_8(&via[SR]);
|
|
out_8(&via[B], in_8(&via[B]) | TACK | TIP);
|
|
req->sent = 1;
|
|
if (req->reply_expected) {
|
|
cuda_state = awaiting_reply;
|
|
} else {
|
|
current_req = req->next;
|
|
complete = 1;
|
|
/* not sure about this */
|
|
cuda_state = idle;
|
|
cuda_start();
|
|
}
|
|
} else {
|
|
out_8(&via[SR], req->data[data_index++]);
|
|
out_8(&via[B], in_8(&via[B]) ^ TACK);
|
|
}
|
|
break;
|
|
|
|
case reading:
|
|
*reply_ptr++ = in_8(&via[SR]);
|
|
if (status == TIP) {
|
|
/* that's all folks */
|
|
out_8(&via[B], in_8(&via[B]) | TACK | TIP);
|
|
cuda_state = read_done;
|
|
} else {
|
|
/* assert status == TIP | TREQ */
|
|
if (status != TIP + TREQ)
|
|
printk("cuda: state=reading status=%x\n", status);
|
|
out_8(&via[B], in_8(&via[B]) ^ TACK);
|
|
}
|
|
break;
|
|
|
|
case read_done:
|
|
(void)in_8(&via[SR]);
|
|
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);
|
|
}
|
|
}
|
|
current_req = req->next;
|
|
complete = 1;
|
|
} else {
|
|
/* This is tricky. We must break the spinlock to call
|
|
* cuda_input. However, doing so means we might get
|
|
* re-entered from another CPU getting an interrupt
|
|
* or calling cuda_poll(). I ended up using the stack
|
|
* (it's only for 16 bytes) and moving the actual
|
|
* call to cuda_input to outside of the lock.
|
|
*/
|
|
ibuf_len = reply_ptr - cuda_rbuf;
|
|
memcpy(ibuf, cuda_rbuf, ibuf_len);
|
|
}
|
|
if (status == TREQ) {
|
|
out_8(&via[B], in_8(&via[B]) & ~TIP);
|
|
cuda_state = reading;
|
|
reply_ptr = cuda_rbuf;
|
|
reading_reply = 0;
|
|
} else {
|
|
cuda_state = idle;
|
|
cuda_start();
|
|
}
|
|
break;
|
|
|
|
default:
|
|
printk("cuda_interrupt: unknown cuda_state %d?\n", cuda_state);
|
|
}
|
|
spin_unlock(&cuda_lock);
|
|
if (complete && req) {
|
|
void (*done)(struct adb_request *) = req->done;
|
|
mb();
|
|
req->complete = 1;
|
|
/* Here, we assume that if the request has a done member, the
|
|
* struct request will survive to setting req->complete to 1
|
|
*/
|
|
if (done)
|
|
(*done)(req);
|
|
}
|
|
if (ibuf_len)
|
|
cuda_input(ibuf, ibuf_len, regs);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static void
|
|
cuda_input(unsigned char *buf, int nb, struct pt_regs *regs)
|
|
{
|
|
int i;
|
|
|
|
switch (buf[0]) {
|
|
case ADB_PACKET:
|
|
#ifdef CONFIG_XMON
|
|
if (nb == 5 && buf[2] == 0x2c) {
|
|
extern int xmon_wants_key, xmon_adb_keycode;
|
|
if (xmon_wants_key) {
|
|
xmon_adb_keycode = buf[3];
|
|
return;
|
|
}
|
|
}
|
|
#endif /* CONFIG_XMON */
|
|
#ifdef CONFIG_ADB
|
|
adb_input(buf+2, nb-2, regs, buf[1] & 0x40);
|
|
#endif /* CONFIG_ADB */
|
|
break;
|
|
|
|
default:
|
|
printk("data from cuda (%d bytes):", nb);
|
|
for (i = 0; i < nb; ++i)
|
|
printk(" %.2x", buf[i]);
|
|
printk("\n");
|
|
}
|
|
}
|