[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / macintosh / via-cuda.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/types.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/delay.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/mac_via.h>
#endif
#include <asm/io.h>
#include <linux/init.h>

static volatile unsigned char __iomem *via;
static DEFINE_SPINLOCK(cuda_lock);

/* 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;
static int cuda_irq;
#ifdef CONFIG_PPC
static struct device_node *vias;
#endif
static int cuda_fully_inited;

#ifdef CONFIG_ADB
static int cuda_probe(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);
static void cuda_input(unsigned char *buf, int nb);
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 = {
	.name         = "CUDA",
	.probe        = cuda_probe,
	.send_request = cuda_send_request,
	.autopoll     = cuda_adb_autopoll,
	.poll         = cuda_poll,
	.reset_bus    = cuda_reset_adb_bus,
};
#endif /* CONFIG_ADB */

#ifdef CONFIG_MAC
int __init find_via_cuda(void)
{
    struct adb_request req;
    int err;

    if (macintosh_config->adb_type != MAC_ADB_CUDA)
	return 0;

    via = via1;
    cuda_state = idle;

    err = cuda_init_via();
    if (err) {
	printk(KERN_ERR "cuda_init_via() failed\n");
	via = NULL;
	return 0;
    }

    /* enable autopoll */
    cuda_request(&req, NULL, 3, CUDA_PACKET, CUDA_AUTOPOLL, 1);
    while (!req.complete)
	cuda_poll();

    return 1;
}
#else
int __init find_via_cuda(void)
{
    struct adb_request req;
    phys_addr_t taddr;
    const u32 *reg;
    int err;

    if (vias != 0)
	return 1;
    vias = of_find_node_by_name(NULL, "via-cuda");
    if (vias == 0)
	return 0;

    reg = of_get_property(vias, "reg", NULL);
    if (reg == NULL) {
	    printk(KERN_ERR "via-cuda: No \"reg\" property !\n");
	    goto fail;
    }
    taddr = of_translate_address(vias, reg);
    if (taddr == 0) {
	    printk(KERN_ERR "via-cuda: Can't translate address !\n");
	    goto fail;
    }
    via = ioremap(taddr, 0x2000);
    if (via == NULL) {
	    printk(KERN_ERR "via-cuda: Can't map address !\n");
	    goto fail;
    }

    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        */

    out_8(&via[IFR], 0x7f);	/* clear interrupts by writing 1s */
    out_8(&via[IER], IER_SET|SR_INT); /* enable interrupt from SR */

    /* enable autopoll */
    cuda_request(&req, NULL, 3, CUDA_PACKET, CUDA_AUTOPOLL, 1);
    while (!req.complete)
	cuda_poll();

    return 1;

 fail:
    of_node_put(vias);
    vias = NULL;
    return 0;
}
#endif /* !defined CONFIG_MAC */

static int __init via_cuda_start(void)
{
    if (via == NULL)
	return -ENODEV;

#ifdef CONFIG_MAC
    cuda_irq = IRQ_MAC_ADB;
#else
    cuda_irq = irq_of_parse_and_map(vias, 0);
    if (cuda_irq == NO_IRQ) {
	printk(KERN_ERR "via-cuda: can't map interrupts for %s\n",
	       vias->full_name);
	return -ENODEV;
    }
#endif

    if (request_irq(cuda_irq, cuda_interrupt, 0, "ADB", cuda_interrupt)) {
	printk(KERN_ERR "via-cuda: can't request 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;
#endif
    if (via == NULL)
	return -ENODEV;
    return 0;
}
#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 */
#ifdef CONFIG_PPC
    out_8(&via[IER], 0x7f);					/* disable interrupts from VIA */
    (void)in_8(&via[IER]);
#else
    out_8(&via[IER], SR_INT);					/* disable SR interrupt from VIA */
#endif

    /* delay 4ms and then clear any pending interrupt */
    mdelay(4);
    (void)in_8(&via[SR]);
    out_8(&via[IFR], SR_INT);

    /* 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], SR_INT);

    /* 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], SR_INT);
    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)
{
    /* cuda_interrupt only takes a normal lock, we disable
     * interrupts here to avoid re-entering and thus deadlocking.
     */
    if (cuda_irq)
	disable_irq(cuda_irq);
    cuda_interrupt(0, NULL);
    if (cuda_irq)
	enable_irq(cuda_irq);
}

static irqreturn_t
cuda_interrupt(int irq, void *arg)
{
    int status;
    struct adb_request *req = NULL;
    unsigned char ibuf[16];
    int ibuf_len = 0;
    int complete = 0;
    
    spin_lock(&cuda_lock);

    /* On powermacs, this handler is registered for the VIA IRQ. But they use
     * just the shift register IRQ -- other VIA interrupt sources are disabled.
     * On m68k macs, the VIA IRQ sources are dispatched individually. Unless
     * we are polling, the shift register IRQ flag has already been cleared.
     */

#ifdef CONFIG_MAC
    if (!arg)
#endif
    {
        if ((in_8(&via[IFR]) & SR_INT) == 0) {
            spin_unlock(&cuda_lock);
            return IRQ_NONE;
        } else {
            out_8(&via[IFR], SR_INT);
        }
    }
    
    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);
    return IRQ_HANDLED;
}

static void
cuda_input(unsigned char *buf, int nb)
{
    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, 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");
    }
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Device driver for the via-cuda on Apple Powermacs.
	3	*
	4	* The VIA (versatile interface adapter) interfaces to the CUDA,
	5	* a 6805 microprocessor core which controls the ADB (Apple Desktop
	6	* Bus) which connects to the keyboard and mouse. The CUDA also
	7	* controls system power and the RTC (real time clock) chip.
	8	*
	9	* Copyright (C) 1996 Paul Mackerras.
	10	*/
	11	#include <stdarg.h>
1da177e4 LT	12	#include <linux/types.h>
	13	#include <linux/errno.h>
	14	#include <linux/kernel.h>
	15	#include <linux/delay.h>
1da177e4 LT	16	#include <linux/adb.h>
	17	#include <linux/cuda.h>
	18	#include <linux/spinlock.h>
	19	#include <linux/interrupt.h>
	20	#ifdef CONFIG_PPC
	21	#include <asm/prom.h>
	22	#include <asm/machdep.h>
	23	#else
	24	#include <asm/macintosh.h>
	25	#include <asm/macints.h>
1da177e4 LT	26	#include <asm/mac_via.h>
	27	#endif
	28	#include <asm/io.h>
1da177e4 LT	29	#include <linux/init.h>
	30
	31	static volatile unsigned char __iomem *via;
	32	static DEFINE_SPINLOCK(cuda_lock);
	33
1da177e4 LT	34	/* VIA registers - spaced 0x200 bytes apart */
	35	#define RS 0x200 /* skip between registers */
	36	#define B 0 /* B-side data */
	37	#define A RS /* A-side data */
	38	#define DIRB (2RS) / B-side direction (1=output) */
	39	#define DIRA (3RS) / A-side direction (1=output) */
	40	#define T1CL (4RS) / Timer 1 ctr/latch (low 8 bits) */
	41	#define T1CH (5RS) / Timer 1 counter (high 8 bits) */
	42	#define T1LL (6RS) / Timer 1 latch (low 8 bits) */
	43	#define T1LH (7RS) / Timer 1 latch (high 8 bits) */
	44	#define T2CL (8RS) / Timer 2 ctr/latch (low 8 bits) */
	45	#define T2CH (9RS) / Timer 2 counter (high 8 bits) */
	46	#define SR (10RS) / Shift register */
	47	#define ACR (11RS) / Auxiliary control register */
	48	#define PCR (12RS) / Peripheral control register */
	49	#define IFR (13RS) / Interrupt flag register */
	50	#define IER (14RS) / Interrupt enable register */
	51	#define ANH (15RS) / A-side data, no handshake */
	52
	53	/* Bits in B data register: all active low */
	54	#define TREQ 0x08 /* Transfer request (input) */
	55	#define TACK 0x10 /* Transfer acknowledge (output) */
	56	#define TIP 0x20 /* Transfer in progress (output) */
	57
	58	/* Bits in ACR */
	59	#define SR_CTRL 0x1c /* Shift register control bits */
	60	#define SR_EXT 0x0c /* Shift on external clock */
	61	#define SR_OUT 0x10 /* Shift out if 1 */
	62
	63	/* Bits in IFR and IER */
	64	#define IER_SET 0x80 /* set bits in IER */
	65	#define IER_CLR 0 /* clear bits in IER */
	66	#define SR_INT 0x04 /* Shift register full/empty */
	67
	68	static enum cuda_state {
	69	idle,
	70	sent_first_byte,
	71	sending,
	72	reading,
	73	read_done,
	74	awaiting_reply
	75	} cuda_state;
	76
	77	static struct adb_request *current_req;
	78	static struct adb_request *last_req;
	79	static unsigned char cuda_rbuf[16];
	80	static unsigned char *reply_ptr;
	81	static int reading_reply;
	82	static int data_index;
0251c38c	83	static int cuda_irq;
1da177e4 LT	84	#ifdef CONFIG_PPC
	85	static struct device_node *vias;
	86	#endif
87275856	87	static int cuda_fully_inited;
1da177e4 LT	88
	89	#ifdef CONFIG_ADB
	90	static int cuda_probe(void);
1da177e4 LT	91	static int cuda_send_request(struct adb_request *req, int sync);
	92	static int cuda_adb_autopoll(int devs);
	93	static int cuda_reset_adb_bus(void);
	94	#endif /* CONFIG_ADB */
	95
	96	static int cuda_init_via(void);
	97	static void cuda_start(void);
7d12e780 DH	98	static irqreturn_t cuda_interrupt(int irq, void *arg);
7d12e780 DH	99	static void cuda_input(unsigned char *buf, int nb);
1da177e4 LT	100	void cuda_poll(void);
	101	static int cuda_write(struct adb_request *req);
	102
	103	int cuda_request(struct adb_request *req,
	104	void (done)(struct adb_request ), int nbytes, ...);
	105
	106	#ifdef CONFIG_ADB
	107	struct adb_driver via_cuda_driver = {
18814ee8 FT	108	.name = "CUDA",
	109	.probe = cuda_probe,
	110	.send_request = cuda_send_request,
	111	.autopoll = cuda_adb_autopoll,
	112	.poll = cuda_poll,
	113	.reset_bus = cuda_reset_adb_bus,
1da177e4 LT	114	};
	115	#endif /* CONFIG_ADB */
	116
18814ee8 FT	117	#ifdef CONFIG_MAC
	118	int __init find_via_cuda(void)
	119	{
	120	struct adb_request req;
	121	int err;
	122
	123	if (macintosh_config->adb_type != MAC_ADB_CUDA)
	124	return 0;
	125
	126	via = via1;
	127	cuda_state = idle;
	128
	129	err = cuda_init_via();
	130	if (err) {
	131	printk(KERN_ERR "cuda_init_via() failed\n");
	132	via = NULL;
	133	return 0;
	134	}
	135
	136	/* enable autopoll */
	137	cuda_request(&req, NULL, 3, CUDA_PACKET, CUDA_AUTOPOLL, 1);
	138	while (!req.complete)
	139	cuda_poll();
	140
	141	return 1;
	142	}
	143	#else
51d3082f	144	int __init find_via_cuda(void)
1da177e4	145	{
1da177e4	146	struct adb_request req;
51d3082f	147	phys_addr_t taddr;
018a3d1d	148	const u32 *reg;
51d3082f	149	int err;
1da177e4 LT	150
	151	if (vias != 0)
	152	return 1;
51d3082f	153	vias = of_find_node_by_name(NULL, "via-cuda");
1da177e4 LT	154	if (vias == 0)
1da177e4 LT	155	return 0;
1da177e4	156
01b2726d	157	reg = of_get_property(vias, "reg", NULL);
51d3082f BH	158	if (reg == NULL) {
	159	printk(KERN_ERR "via-cuda: No \"reg\" property !\n");
	160	goto fail;
	161	}
	162	taddr = of_translate_address(vias, reg);
	163	if (taddr == 0) {
	164	printk(KERN_ERR "via-cuda: Can't translate address !\n");
	165	goto fail;
	166	}
	167	via = ioremap(taddr, 0x2000);
	168	if (via == NULL) {
	169	printk(KERN_ERR "via-cuda: Can't map address !\n");
	170	goto fail;
1da177e4	171	}
1da177e4 LT	172
	173	cuda_state = idle;
	174	sys_ctrler = SYS_CTRLER_CUDA;
	175
	176	err = cuda_init_via();
	177	if (err) {
	178	printk(KERN_ERR "cuda_init_via() failed\n");
	179	via = NULL;
	180	return 0;
	181	}
	182
	183	/* Clear and enable interrupts, but only on PPC. On 68K it's done */
	184	/* for us by the main VIA driver in arch/m68k/mac/via.c */
	185
1da177e4 LT	186	out_8(&via[IFR], 0x7f); /* clear interrupts by writing 1s */
1da177e4 LT	187	out_8(&via[IER], IER_SET\|SR_INT); /* enable interrupt from SR */
1da177e4 LT	188
	189	/* enable autopoll */
	190	cuda_request(&req, NULL, 3, CUDA_PACKET, CUDA_AUTOPOLL, 1);
	191	while (!req.complete)
	192	cuda_poll();
	193
	194	return 1;
51d3082f BH	195
	196	fail:
	197	of_node_put(vias);
	198	vias = NULL;
	199	return 0;
1da177e4	200	}
18814ee8	201	#endif /* !defined CONFIG_MAC */
1da177e4 LT	202
	203	static int __init via_cuda_start(void)
	204	{
	205	if (via == NULL)
	206	return -ENODEV;
	207
0ebfff14	208	#ifdef CONFIG_MAC
0251c38c	209	cuda_irq = IRQ_MAC_ADB;
18814ee8	210	#else
0251c38c FT	211	cuda_irq = irq_of_parse_and_map(vias, 0);
0251c38c FT	212	if (cuda_irq == NO_IRQ) {
0ebfff14 BH	213	printk(KERN_ERR "via-cuda: can't map interrupts for %s\n",
	214	vias->full_name);
	215	return -ENODEV;
	216	}
18814ee8	217	#endif
0ebfff14	218
0251c38c FT	219	if (request_irq(cuda_irq, cuda_interrupt, 0, "ADB", cuda_interrupt)) {
0251c38c FT	220	printk(KERN_ERR "via-cuda: can't request irq %d\n", cuda_irq);
1da177e4 LT	221	return -EAGAIN;
	222	}
	223
	224	printk("Macintosh CUDA driver v0.5 for Unified ADB.\n");
	225
	226	cuda_fully_inited = 1;
	227	return 0;
	228	}
	229
	230	device_initcall(via_cuda_start);
	231
	232	#ifdef CONFIG_ADB
	233	static int
	234	cuda_probe(void)
	235	{
	236	#ifdef CONFIG_PPC
	237	if (sys_ctrler != SYS_CTRLER_CUDA)
	238	return -ENODEV;
	239	#else
	240	if (macintosh_config->adb_type != MAC_ADB_CUDA)
	241	return -ENODEV;
1da177e4	242	#endif
1da177e4 LT	243	if (via == NULL)
	244	return -ENODEV;
	245	return 0;
1da177e4 LT	246	}
	247	#endif /* CONFIG_ADB */
	248
	249	#define WAIT_FOR(cond, what) \
	250	do { \
	251	int x; \
	252	for (x = 1000; !(cond); --x) { \
	253	if (x == 0) { \
	254	printk("Timeout waiting for " what "\n"); \
	255	return -ENXIO; \
	256	} \
	257	udelay(100); \
	258	} \
	259	} while (0)
	260
	261	static int
	262	cuda_init_via(void)
	263	{
	264	out_8(&via[DIRB], (in_8(&via[DIRB]) \| TACK \| TIP) & ~TREQ); /* TACK & TIP out */
	265	out_8(&via[B], in_8(&via[B]) \| TACK \| TIP); /* negate them */
	266	out_8(&via[ACR] ,(in_8(&via[ACR]) & ~SR_CTRL) \| SR_EXT); /* SR data in */
	267	(void)in_8(&via[SR]); /* clear any left-over data */
0251c38c	268	#ifdef CONFIG_PPC
1da177e4 LT	269	out_8(&via[IER], 0x7f); /* disable interrupts from VIA */
1da177e4 LT	270	(void)in_8(&via[IER]);
0251c38c FT	271	#else
0251c38c FT	272	out_8(&via[IER], SR_INT); /* disable SR interrupt from VIA */
1da177e4 LT	273	#endif
	274
	275	/* delay 4ms and then clear any pending interrupt */
	276	mdelay(4);
	277	(void)in_8(&via[SR]);
0251c38c	278	out_8(&via[IFR], SR_INT);
1da177e4 LT	279
	280	/* sync with the CUDA - assert TACK without TIP */
	281	out_8(&via[B], in_8(&via[B]) & ~TACK);
	282
	283	/* wait for the CUDA to assert TREQ in response */
	284	WAIT_FOR((in_8(&via[B]) & TREQ) == 0, "CUDA response to sync");
	285
	286	/* wait for the interrupt and then clear it */
	287	WAIT_FOR(in_8(&via[IFR]) & SR_INT, "CUDA response to sync (2)");
	288	(void)in_8(&via[SR]);
0251c38c	289	out_8(&via[IFR], SR_INT);
1da177e4 LT	290
	291	/* finish the sync by negating TACK */
	292	out_8(&via[B], in_8(&via[B]) \| TACK);
	293
	294	/* wait for the CUDA to negate TREQ and the corresponding interrupt */
	295	WAIT_FOR(in_8(&via[B]) & TREQ, "CUDA response to sync (3)");
	296	WAIT_FOR(in_8(&via[IFR]) & SR_INT, "CUDA response to sync (4)");
	297	(void)in_8(&via[SR]);
0251c38c	298	out_8(&via[IFR], SR_INT);
1da177e4 LT	299	out_8(&via[B], in_8(&via[B]) \| TIP); /* should be unnecessary */
	300
	301	return 0;
	302	}
	303
	304	#ifdef CONFIG_ADB
	305	/* Send an ADB command */
	306	static int
	307	cuda_send_request(struct adb_request *req, int sync)
	308	{
	309	int i;
	310
	311	if ((via == NULL) \|\| !cuda_fully_inited) {
	312	req->complete = 1;
	313	return -ENXIO;
	314	}
	315
	316	req->reply_expected = 1;
	317
	318	i = cuda_write(req);
	319	if (i)
	320	return i;
	321
	322	if (sync) {
	323	while (!req->complete)
	324	cuda_poll();
	325	}
	326	return 0;
	327	}
	328
	329
	330	/* Enable/disable autopolling */
	331	static int
	332	cuda_adb_autopoll(int devs)
	333	{
	334	struct adb_request req;
	335
	336	if ((via == NULL) \|\| !cuda_fully_inited)
	337	return -ENXIO;
	338
	339	cuda_request(&req, NULL, 3, CUDA_PACKET, CUDA_AUTOPOLL, (devs? 1: 0));
	340	while (!req.complete)
	341	cuda_poll();
	342	return 0;
	343	}
	344
	345	/* Reset adb bus - how do we do this?? */
	346	static int
	347	cuda_reset_adb_bus(void)
	348	{
	349	struct adb_request req;
	350
	351	if ((via == NULL) \|\| !cuda_fully_inited)
	352	return -ENXIO;
	353
	354	cuda_request(&req, NULL, 2, ADB_PACKET, 0); /* maybe? */
	355	while (!req.complete)
	356	cuda_poll();
	357	return 0;
	358	}
	359	#endif /* CONFIG_ADB */
	360	/* Construct and send a cuda request */
	361	int
	362	cuda_request(struct adb_request req, void (done)(struct adb_request *),
363	int nbytes, ...)
364	{
365	va_list list;
366	int i;
367
368	if (via == NULL) {
369	req->complete = 1;
370	return -ENXIO;
371	}
372
373	req->nbytes = nbytes;
374	req->done = done;
375	va_start(list, nbytes);
376	for (i = 0; i < nbytes; ++i)
377	req->data[i] = va_arg(list, int);
378	va_end(list);
379	req->reply_expected = 1;
380	return cuda_write(req);
381	}
382
383	static int
384	cuda_write(struct adb_request *req)
385	{
386	unsigned long flags;
387
388	if (req->nbytes < 2 \|\| req->data[0] > CUDA_PACKET) {
389	req->complete = 1;
390	return -EINVAL;
391	}
392	req->next = NULL;
393	req->sent = 0;
394	req->complete = 0;
395	req->reply_len = 0;
396
397	spin_lock_irqsave(&cuda_lock, flags);
398	if (current_req != 0) {
399	last_req->next = req;
400	last_req = req;
401	} else {
402	current_req = req;
403	last_req = req;
404	if (cuda_state == idle)
405	cuda_start();
406	}
407	spin_unlock_irqrestore(&cuda_lock, flags);
408
409	return 0;
410	}
411
412	static void
413	cuda_start(void)
414	{
415	struct adb_request *req;
416
417	/* assert cuda_state == idle */
418	/* get the packet to send */
419	req = current_req;
420	if (req == 0)
421	return;
422	if ((in_8(&via[B]) & TREQ) == 0)
423	return; /* a byte is coming in from the CUDA */
424
425	/* set the shift register to shift out and send a byte */
426	out_8(&via[ACR], in_8(&via[ACR]) \| SR_OUT);
427	out_8(&via[SR], req->data[0]);
428	out_8(&via[B], in_8(&via[B]) & ~TIP);
429	cuda_state = sent_first_byte;
430	}
431
432	void
433	cuda_poll(void)
434	{
1da177e4 LT	435	/* cuda_interrupt only takes a normal lock, we disable
1da177e4 LT	436	* interrupts here to avoid re-entering and thus deadlocking.
1da177e4	437	*/
18814ee8 FT	438	if (cuda_irq)
18814ee8 FT	439	disable_irq(cuda_irq);
49f19ce4	440	cuda_interrupt(0, NULL);
18814ee8 FT	441	if (cuda_irq)
18814ee8 FT	442	enable_irq(cuda_irq);
1da177e4 LT	443	}
	444
	445	static irqreturn_t
7d12e780	446	cuda_interrupt(int irq, void *arg)
1da177e4 LT	447	{
	448	int status;
	449	struct adb_request *req = NULL;
	450	unsigned char ibuf[16];
	451	int ibuf_len = 0;
	452	int complete = 0;
1da177e4 LT	453
	454	spin_lock(&cuda_lock);
	455
18814ee8	456	/* On powermacs, this handler is registered for the VIA IRQ. But they use
0251c38c FT	457	* just the shift register IRQ -- other VIA interrupt sources are disabled.
	458	* On m68k macs, the VIA IRQ sources are dispatched individually. Unless
	459	* we are polling, the shift register IRQ flag has already been cleared.
	460	*/
	461
	462	#ifdef CONFIG_MAC
	463	if (!arg)
	464	#endif
	465	{
	466	if ((in_8(&via[IFR]) & SR_INT) == 0) {
	467	spin_unlock(&cuda_lock);
	468	return IRQ_NONE;
	469	} else {
	470	out_8(&via[IFR], SR_INT);
	471	}
1da177e4 LT	472	}
	473
	474	status = (~in_8(&via[B]) & (TIP\|TREQ)) \| (in_8(&via[ACR]) & SR_OUT);
	475	/* printk("cuda_interrupt: state=%d status=%x\n", cuda_state, status); */
	476	switch (cuda_state) {
	477	case idle:
	478	/* CUDA has sent us the first byte of data - unsolicited */
	479	if (status != TREQ)
	480	printk("cuda: state=idle, status=%x\n", status);
	481	(void)in_8(&via[SR]);
	482	out_8(&via[B], in_8(&via[B]) & ~TIP);
	483	cuda_state = reading;
	484	reply_ptr = cuda_rbuf;
	485	reading_reply = 0;
	486	break;
	487
	488	case awaiting_reply:
	489	/* CUDA has sent us the first byte of data of a reply */
	490	if (status != TREQ)
	491	printk("cuda: state=awaiting_reply, status=%x\n", status);
	492	(void)in_8(&via[SR]);
	493	out_8(&via[B], in_8(&via[B]) & ~TIP);
	494	cuda_state = reading;
	495	reply_ptr = current_req->reply;
	496	reading_reply = 1;
	497	break;
	498
	499	case sent_first_byte:
	500	if (status == TREQ + TIP + SR_OUT) {
	501	/* collision */
	502	out_8(&via[ACR], in_8(&via[ACR]) & ~SR_OUT);
	503	(void)in_8(&via[SR]);
	504	out_8(&via[B], in_8(&via[B]) \| TIP \| TACK);
	505	cuda_state = idle;
	506	} else {
	507	/* assert status == TIP + SR_OUT */
	508	if (status != TIP + SR_OUT)
	509	printk("cuda: state=sent_first_byte status=%x\n", status);
	510	out_8(&via[SR], current_req->data[1]);
	511	out_8(&via[B], in_8(&via[B]) ^ TACK);
	512	data_index = 2;
	513	cuda_state = sending;
	514	}
	515	break;
	516
	517	case sending:
	518	req = current_req;
	519	if (data_index >= req->nbytes) {
	520	out_8(&via[ACR], in_8(&via[ACR]) & ~SR_OUT);
	521	(void)in_8(&via[SR]);
	522	out_8(&via[B], in_8(&via[B]) \| TACK \| TIP);
	523	req->sent = 1;
	524	if (req->reply_expected) {
	525	cuda_state = awaiting_reply;
	526	} else {
	527	current_req = req->next;
	528	complete = 1;
	529	/* not sure about this */
	530	cuda_state = idle;
	531	cuda_start();
	532	}
	533	} else {
	534	out_8(&via[SR], req->data[data_index++]);
	535	out_8(&via[B], in_8(&via[B]) ^ TACK);
536	}
537	break;
538
539	case reading:
540	*reply_ptr++ = in_8(&via[SR]);
541	if (status == TIP) {
542	/* that's all folks */
543	out_8(&via[B], in_8(&via[B]) \| TACK \| TIP);
544	cuda_state = read_done;
545	} else {
546	/* assert status == TIP \| TREQ */
547	if (status != TIP + TREQ)
548	printk("cuda: state=reading status=%x\n", status);
549	out_8(&via[B], in_8(&via[B]) ^ TACK);
550	}
551	break;
552
553	case read_done:
554	(void)in_8(&via[SR]);
555	if (reading_reply) {
556	req = current_req;
557	req->reply_len = reply_ptr - req->reply;
558	if (req->data[0] == ADB_PACKET) {
559	/* Have to adjust the reply from ADB commands */
560	if (req->reply_len <= 2 \|\| (req->reply[1] & 2) != 0) {
561	/* the 0x2 bit indicates no response */
562	req->reply_len = 0;
563	} else {
564	/* leave just the command and result bytes in the reply */
565	req->reply_len -= 2;
566	memmove(req->reply, req->reply + 2, req->reply_len);
567	}
568	}
569	current_req = req->next;
570	complete = 1;
571	} else {
572	/* This is tricky. We must break the spinlock to call
573	* cuda_input. However, doing so means we might get
574	* re-entered from another CPU getting an interrupt
575	* or calling cuda_poll(). I ended up using the stack
576	* (it's only for 16 bytes) and moving the actual
577	* call to cuda_input to outside of the lock.
578	*/
579	ibuf_len = reply_ptr - cuda_rbuf;
580	memcpy(ibuf, cuda_rbuf, ibuf_len);
581	}
582	if (status == TREQ) {
583	out_8(&via[B], in_8(&via[B]) & ~TIP);
584	cuda_state = reading;
585	reply_ptr = cuda_rbuf;
586	reading_reply = 0;
587	} else {
588	cuda_state = idle;
589	cuda_start();
590	}
591	break;
592
593	default:
594	printk("cuda_interrupt: unknown cuda_state %d?\n", cuda_state);
595	}
596	spin_unlock(&cuda_lock);
597	if (complete && req) {
598	void (done)(struct adb_request ) = req->done;
599	mb();
600	req->complete = 1;
601	/* Here, we assume that if the request has a done member, the
602	* struct request will survive to setting req->complete to 1
603	*/
604	if (done)
605	(*done)(req);
606	}
607	if (ibuf_len)
7d12e780	608	cuda_input(ibuf, ibuf_len);
1da177e4 LT	609	return IRQ_HANDLED;
	610	}
	611
	612	static void
7d12e780	613	cuda_input(unsigned char *buf, int nb)
1da177e4 LT	614	{
	615	int i;
	616
	617	switch (buf[0]) {
	618	case ADB_PACKET:
	619	#ifdef CONFIG_XMON
	620	if (nb == 5 && buf[2] == 0x2c) {
	621	extern int xmon_wants_key, xmon_adb_keycode;
	622	if (xmon_wants_key) {
	623	xmon_adb_keycode = buf[3];
	624	return;
	625	}
	626	}
	627	#endif /* CONFIG_XMON */
	628	#ifdef CONFIG_ADB
7d12e780	629	adb_input(buf+2, nb-2, buf[1] & 0x40);
1da177e4 LT	630	#endif /* CONFIG_ADB */
	631	break;
	632
	633	default:
	634	printk("data from cuda (%d bytes):", nb);
	635	for (i = 0; i < nb; ++i)
	636	printk(" %.2x", buf[i]);
	637	printk("\n");
	638	}
	639	}