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[/] [test_project/] [trunk/] [linux_sd_driver/] [drivers/] [macintosh/] [via-cuda.c] - Blame information for rev 62

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/*
 * 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/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;
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_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 = 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 /* CONFIG_PPC */
 
static int __init via_cuda_start(void)
{
    if (via == NULL)
        return -ENODEV;
 
#ifdef CONFIG_MAC
    cuda_irq = IRQ_MAC_ADB;
#else /* CONFIG_MAC */
    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 /* CONFIG_MAC */
 
    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;
    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;
    }
    out_8(&via[IER], IER_SET|SR_INT); /* enable interrupt from SR */
 
    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 */
#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.
     */
    disable_irq(cuda_irq);
    cuda_interrupt(0, NULL);
    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 it uses
     * 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");
    }
}

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[/] [test_project/] [trunk/] [linux_sd_driver/] [drivers/] [macintosh/] [via-cuda.c] - Blame information for rev 62

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