[linux-2.6-block.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/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);

/* 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);
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 = {
	"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)
{
    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 = 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        */

#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;

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

static int __init via_cuda_start(void)
{
    unsigned int irq;

    if (via == NULL)
	return -ENODEV;

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

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