Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 628 insertions, 0 deletions

diff --git a/drivers/macintosh/via-cuda.c b/drivers/macintosh/via-cuda.c
new file mode 100644
index 000000000000..417deb5de108
--- /dev/null
+++ b/drivers/macintosh/via-cuda.c
@@ -0,0 +1,628 @@
+/*
+ * Device driver for the via-cuda on Apple Powermacs.
+ *
+ * The VIA (versatile interface adapter) interfaces to the CUDA,
+ * a 6805 microprocessor core which controls the ADB (Apple Desktop
+ * Bus) which connects to the keyboard and mouse.  The CUDA also
+ * controls system power and the RTC (real time clock) chip.
+ *
+ * Copyright (C) 1996 Paul Mackerras.
+ */
+#include <stdarg.h>
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/sched.h>
+#include <linux/adb.h>
+#include <linux/cuda.h>
+#include <linux/spinlock.h>
+#include <linux/interrupt.h>
+#ifdef CONFIG_PPC
+#include <asm/prom.h>
+#include <asm/machdep.h>
+#else
+#include <asm/macintosh.h>
+#include <asm/macints.h>
+#include <asm/machw.h>
+#include <asm/mac_via.h>
+#endif
+#include <asm/io.h>
+#include <asm/system.h>
+#include <linux/init.h>
+
+static volatile unsigned char __iomem *via;
+static DEFINE_SPINLOCK(cuda_lock);
+
+#ifdef CONFIG_MAC
+#define CUDA_IRQ IRQ_MAC_ADB
+#define __openfirmware
+#define eieio()
+#else
+#define CUDA_IRQ vias->intrs[0].line
+#endif
+
+/* VIA registers - spaced 0x200 bytes apart */
+#define RS              0x200           /* skip between registers */
+#define B               0               /* B-side data */
+#define A               RS              /* A-side data */
+#define DIRB            (2*RS)          /* B-side direction (1=output) */
+#define DIRA            (3*RS)          /* A-side direction (1=output) */
+#define T1CL            (4*RS)          /* Timer 1 ctr/latch (low 8 bits) */
+#define T1CH            (5*RS)          /* Timer 1 counter (high 8 bits) */
+#define T1LL            (6*RS)          /* Timer 1 latch (low 8 bits) */
+#define T1LH            (7*RS)          /* Timer 1 latch (high 8 bits) */
+#define T2CL            (8*RS)          /* Timer 2 ctr/latch (low 8 bits) */
+#define T2CH            (9*RS)          /* Timer 2 counter (high 8 bits) */
+#define SR              (10*RS)         /* Shift register */
+#define ACR             (11*RS)         /* Auxiliary control register */
+#define PCR             (12*RS)         /* Peripheral control register */
+#define IFR             (13*RS)         /* Interrupt flag register */
+#define IER             (14*RS)         /* Interrupt enable register */
+#define ANH             (15*RS)         /* A-side data, no handshake */
+
+/* Bits in B data register: all active low */
+#define TREQ            0x08            /* Transfer request (input) */
+#define TACK            0x10            /* Transfer acknowledge (output) */
+#define TIP             0x20            /* Transfer in progress (output) */
+
+/* Bits in ACR */
+#define SR_CTRL         0x1c            /* Shift register control bits */
+#define SR_EXT          0x0c            /* Shift on external clock */
+#define SR_OUT          0x10            /* Shift out if 1 */
+
+/* Bits in IFR and IER */
+#define IER_SET         0x80            /* set bits in IER */
+#define IER_CLR         0               /* clear bits in IER */
+#define SR_INT          0x04            /* Shift register full/empty */
+
+static enum cuda_state {
+    idle,
+    sent_first_byte,
+    sending,
+    reading,
+    read_done,
+    awaiting_reply
+} cuda_state;
+
+static struct adb_request *current_req;
+static struct adb_request *last_req;
+static unsigned char cuda_rbuf[16];
+static unsigned char *reply_ptr;
+static int reading_reply;
+static int data_index;
+#ifdef CONFIG_PPC
+static struct device_node *vias;
+#endif
+static int cuda_fully_inited = 0;
+
+#ifdef CONFIG_ADB
+static int cuda_probe(void);
+static int cuda_init(void);
+static int cuda_send_request(struct adb_request *req, int sync);
+static int cuda_adb_autopoll(int devs);
+static int cuda_reset_adb_bus(void);
+#endif /* CONFIG_ADB */
+
+static int cuda_init_via(void);
+static void cuda_start(void);
+static irqreturn_t cuda_interrupt(int irq, void *arg, struct pt_regs *regs);
+static void cuda_input(unsigned char *buf, int nb, struct pt_regs *regs);
+void cuda_poll(void);
+static int cuda_write(struct adb_request *req);
+
+int cuda_request(struct adb_request *req,
+                 void (*done)(struct adb_request *), int nbytes, ...);
+
+#ifdef CONFIG_ADB
+struct adb_driver via_cuda_driver = {
+        "CUDA",
+        cuda_probe,
+        cuda_init,
+        cuda_send_request,
+        cuda_adb_autopoll,
+        cuda_poll,
+        cuda_reset_adb_bus
+};
+#endif /* CONFIG_ADB */
+
+#ifdef CONFIG_PPC
+int __init
+find_via_cuda(void)
+{
+    int err;
+    struct adb_request req;
+
+    if (vias != 0)
+        return 1;
+    vias = find_devices("via-cuda");
+    if (vias == 0)
+        return 0;
+    if (vias->next != 0)
+        printk(KERN_WARNING "Warning: only using 1st via-cuda\n");
+
+#if 0
+    { int i;
+
+    printk("find_via_cuda: node = %p, addrs =", vias->node);
+    for (i = 0; i < vias->n_addrs; ++i)
+        printk(" %x(%x)", vias->addrs[i].address, vias->addrs[i].size);
+    printk(", intrs =");
+    for (i = 0; i < vias->n_intrs; ++i)
+        printk(" %x", vias->intrs[i].line);
+    printk("\n"); }
+#endif
+
+    if (vias->n_addrs != 1 || vias->n_intrs != 1) {
+        printk(KERN_ERR "via-cuda: expecting 1 address (%d) and 1 interrupt (%d)\n",
+               vias->n_addrs, vias->n_intrs);
+        if (vias->n_addrs < 1 || vias->n_intrs < 1)
+            return 0;
+    }
+    via = ioremap(vias->addrs->address, 0x2000);
+
+    cuda_state = idle;
+    sys_ctrler = SYS_CTRLER_CUDA;
+
+    err = cuda_init_via();
+    if (err) {
+        printk(KERN_ERR "cuda_init_via() failed\n");
+        via = NULL;
+        return 0;
+    }
+
+    /* Clear and enable interrupts, but only on PPC. On 68K it's done  */
+    /* for us by the main VIA driver in arch/m68k/mac/via.c        */
+
+#ifndef CONFIG_MAC
+    out_8(&via[IFR], 0x7f);     /* clear interrupts by writing 1s */
+    out_8(&via[IER], IER_SET|SR_INT); /* enable interrupt from SR */
+#endif
+
+    /* enable autopoll */
+    cuda_request(&req, NULL, 3, CUDA_PACKET, CUDA_AUTOPOLL, 1);
+    while (!req.complete)
+        cuda_poll();
+
+    return 1;
+}
+#endif /* CONFIG_PPC */
+
+static int __init via_cuda_start(void)
+{
+    if (via == NULL)
+        return -ENODEV;
+
+#ifdef CONFIG_PPC
+    request_OF_resource(vias, 0, NULL);
+#endif
+
+    if (request_irq(CUDA_IRQ, cuda_interrupt, 0, "ADB", cuda_interrupt)) {
+        printk(KERN_ERR "cuda_init: can't get irq %d\n", CUDA_IRQ);
+        return -EAGAIN;
+    }
+
+    printk("Macintosh CUDA driver v0.5 for Unified ADB.\n");
+
+    cuda_fully_inited = 1;
+    return 0;
+}
+
+device_initcall(via_cuda_start);
+
+#ifdef CONFIG_ADB
+static int
+cuda_probe(void)
+{
+#ifdef CONFIG_PPC
+    if (sys_ctrler != SYS_CTRLER_CUDA)
+        return -ENODEV;
+#else
+    if (macintosh_config->adb_type != MAC_ADB_CUDA)
+        return -ENODEV;
+    via = via1;
+#endif
+    return 0;
+}
+
+static int __init
+cuda_init(void)
+{
+#ifdef CONFIG_PPC
+    if (via == NULL)
+        return -ENODEV;
+    return 0;
+#else 
+    int err = cuda_init_via();
+    if (err) {
+        printk(KERN_ERR "cuda_init_via() failed\n");
+        return -ENODEV;
+    }
+
+    return via_cuda_start();
+#endif
+}
+#endif /* CONFIG_ADB */
+
+#define WAIT_FOR(cond, what)                                    \
+    do {                                                        \
+        int x;                                                  \
+        for (x = 1000; !(cond); --x) {                          \
+            if (x == 0) {                                       \
+                printk("Timeout waiting for " what "\n");       \
+                return -ENXIO;                                  \
+            }                                                   \
+            udelay(100);                                        \
+        }                                                       \
+    } while (0)
+
+static int
+cuda_init_via(void)
+{
+    out_8(&via[DIRB], (in_8(&via[DIRB]) | TACK | TIP) & ~TREQ); /* TACK & TIP out */
+    out_8(&via[B], in_8(&via[B]) | TACK | TIP);                 /* negate them */
+    out_8(&via[ACR] ,(in_8(&via[ACR]) & ~SR_CTRL) | SR_EXT);    /* SR data in */
+    (void)in_8(&via[SR]);                                               /* clear any left-over data */
+#ifndef CONFIG_MAC
+    out_8(&via[IER], 0x7f);                                     /* disable interrupts from VIA */
+    (void)in_8(&via[IER]);
+#endif
+
+    /* delay 4ms and then clear any pending interrupt */
+    mdelay(4);
+    (void)in_8(&via[SR]);
+    out_8(&via[IFR], in_8(&via[IFR]) & 0x7f);
+
+    /* sync with the CUDA - assert TACK without TIP */
+    out_8(&via[B], in_8(&via[B]) & ~TACK);
+
+    /* wait for the CUDA to assert TREQ in response */
+    WAIT_FOR((in_8(&via[B]) & TREQ) == 0, "CUDA response to sync");
+
+    /* wait for the interrupt and then clear it */
+    WAIT_FOR(in_8(&via[IFR]) & SR_INT, "CUDA response to sync (2)");
+    (void)in_8(&via[SR]);
+    out_8(&via[IFR], in_8(&via[IFR]) & 0x7f);
+
+    /* finish the sync by negating TACK */
+    out_8(&via[B], in_8(&via[B]) | TACK);
+
+    /* wait for the CUDA to negate TREQ and the corresponding interrupt */
+    WAIT_FOR(in_8(&via[B]) & TREQ, "CUDA response to sync (3)");
+    WAIT_FOR(in_8(&via[IFR]) & SR_INT, "CUDA response to sync (4)");
+    (void)in_8(&via[SR]);
+    out_8(&via[IFR], in_8(&via[IFR]) & 0x7f);
+    out_8(&via[B], in_8(&via[B]) | TIP);        /* should be unnecessary */
+
+    return 0;
+}
+
+#ifdef CONFIG_ADB
+/* Send an ADB command */
+static int
+cuda_send_request(struct adb_request *req, int sync)
+{
+    int i;
+
+    if ((via == NULL) || !cuda_fully_inited) {
+        req->complete = 1;
+        return -ENXIO;
+    }
+  
+    req->reply_expected = 1;
+
+    i = cuda_write(req);
+    if (i)
+        return i;
+
+    if (sync) {
+        while (!req->complete)
+            cuda_poll();
+    }
+    return 0;
+}
+
+
+/* Enable/disable autopolling */
+static int
+cuda_adb_autopoll(int devs)
+{
+    struct adb_request req;
+
+    if ((via == NULL) || !cuda_fully_inited)
+        return -ENXIO;
+
+    cuda_request(&req, NULL, 3, CUDA_PACKET, CUDA_AUTOPOLL, (devs? 1: 0));
+    while (!req.complete)
+        cuda_poll();
+    return 0;
+}
+
+/* Reset adb bus - how do we do this?? */
+static int
+cuda_reset_adb_bus(void)
+{
+    struct adb_request req;
+
+    if ((via == NULL) || !cuda_fully_inited)
+        return -ENXIO;
+
+    cuda_request(&req, NULL, 2, ADB_PACKET, 0);         /* maybe? */
+    while (!req.complete)
+        cuda_poll();
+    return 0;
+}
+#endif /* CONFIG_ADB */
+/* Construct and send a cuda request */
+int
+cuda_request(struct adb_request *req, void (*done)(struct adb_request *),
+             int nbytes, ...)
+{
+    va_list list;
+    int i;
+
+    if (via == NULL) {
+        req->complete = 1;
+        return -ENXIO;
+    }
+
+    req->nbytes = nbytes;
+    req->done = done;
+    va_start(list, nbytes);
+    for (i = 0; i < nbytes; ++i)
+        req->data[i] = va_arg(list, int);
+    va_end(list);
+    req->reply_expected = 1;
+    return cuda_write(req);
+}
+
+static int
+cuda_write(struct adb_request *req)
+{
+    unsigned long flags;
+
+    if (req->nbytes < 2 || req->data[0] > CUDA_PACKET) {
+        req->complete = 1;
+        return -EINVAL;
+    }
+    req->next = NULL;
+    req->sent = 0;
+    req->complete = 0;
+    req->reply_len = 0;
+
+    spin_lock_irqsave(&cuda_lock, flags);
+    if (current_req != 0) {
+        last_req->next = req;
+        last_req = req;
+    } else {
+        current_req = req;
+        last_req = req;
+        if (cuda_state == idle)
+            cuda_start();
+    }
+    spin_unlock_irqrestore(&cuda_lock, flags);
+
+    return 0;
+}
+
+static void
+cuda_start(void)
+{
+    struct adb_request *req;
+
+    /* assert cuda_state == idle */
+    /* get the packet to send */
+    req = current_req;
+    if (req == 0)
+        return;
+    if ((in_8(&via[B]) & TREQ) == 0)
+        return;                 /* a byte is coming in from the CUDA */
+
+    /* set the shift register to shift out and send a byte */
+    out_8(&via[ACR], in_8(&via[ACR]) | SR_OUT);
+    out_8(&via[SR], req->data[0]);
+    out_8(&via[B], in_8(&via[B]) & ~TIP);
+    cuda_state = sent_first_byte;
+}
+
+void
+cuda_poll(void)
+{
+    unsigned long flags;
+
+    /* cuda_interrupt only takes a normal lock, we disable
+     * interrupts here to avoid re-entering and thus deadlocking.
+     * An option would be to disable only the IRQ source with
+     * disable_irq(), would that work on m68k ? --BenH
+     */
+    local_irq_save(flags);
+    cuda_interrupt(0, NULL, NULL);
+    local_irq_restore(flags);
+}
+
+static irqreturn_t
+cuda_interrupt(int irq, void *arg, struct pt_regs *regs)
+{
+    int status;
+    struct adb_request *req = NULL;
+    unsigned char ibuf[16];
+    int ibuf_len = 0;
+    int complete = 0;
+    unsigned char virq;
+    
+    spin_lock(&cuda_lock);
+
+    virq = in_8(&via[IFR]) & 0x7f;
+    out_8(&via[IFR], virq);   
+    if ((virq & SR_INT) == 0) {
+        spin_unlock(&cuda_lock);
+        return IRQ_NONE;
+    }
+    
+    status = (~in_8(&via[B]) & (TIP|TREQ)) | (in_8(&via[ACR]) & SR_OUT);
+    /* printk("cuda_interrupt: state=%d status=%x\n", cuda_state, status); */
+    switch (cuda_state) {
+    case idle:
+        /* CUDA has sent us the first byte of data - unsolicited */
+        if (status != TREQ)
+            printk("cuda: state=idle, status=%x\n", status);
+        (void)in_8(&via[SR]);
+        out_8(&via[B], in_8(&via[B]) & ~TIP);
+        cuda_state = reading;
+        reply_ptr = cuda_rbuf;
+        reading_reply = 0;
+        break;
+
+    case awaiting_reply:
+        /* CUDA has sent us the first byte of data of a reply */
+        if (status != TREQ)
+            printk("cuda: state=awaiting_reply, status=%x\n", status);
+        (void)in_8(&via[SR]);
+        out_8(&via[B], in_8(&via[B]) & ~TIP);
+        cuda_state = reading;
+        reply_ptr = current_req->reply;
+        reading_reply = 1;
+        break;
+
+    case sent_first_byte:
+        if (status == TREQ + TIP + SR_OUT) {
+            /* collision */
+            out_8(&via[ACR], in_8(&via[ACR]) & ~SR_OUT);
+            (void)in_8(&via[SR]);
+            out_8(&via[B], in_8(&via[B]) | TIP | TACK);
+            cuda_state = idle;
+        } else {
+            /* assert status == TIP + SR_OUT */
+            if (status != TIP + SR_OUT)
+                printk("cuda: state=sent_first_byte status=%x\n", status);
+            out_8(&via[SR], current_req->data[1]);
+            out_8(&via[B], in_8(&via[B]) ^ TACK);
+            data_index = 2;
+            cuda_state = sending;
+        }
+        break;
+
+    case sending:
+        req = current_req;
+        if (data_index >= req->nbytes) {
+            out_8(&via[ACR], in_8(&via[ACR]) & ~SR_OUT);
+            (void)in_8(&via[SR]);
+            out_8(&via[B], in_8(&via[B]) | TACK | TIP);
+            req->sent = 1;
+            if (req->reply_expected) {
+                cuda_state = awaiting_reply;
+            } else {
+                current_req = req->next;
+                complete = 1;
+                /* not sure about this */
+                cuda_state = idle;
+                cuda_start();
+            }
+        } else {
+            out_8(&via[SR], req->data[data_index++]);
+            out_8(&via[B], in_8(&via[B]) ^ TACK);
+        }
+        break;
+
+    case reading:
+        *reply_ptr++ = in_8(&via[SR]);
+        if (status == TIP) {
+            /* that's all folks */
+            out_8(&via[B], in_8(&via[B]) | TACK | TIP);
+            cuda_state = read_done;
+        } else {
+            /* assert status == TIP | TREQ */
+            if (status != TIP + TREQ)
+                printk("cuda: state=reading status=%x\n", status);
+            out_8(&via[B], in_8(&via[B]) ^ TACK);
+        }
+        break;
+
+    case read_done:
+        (void)in_8(&via[SR]);
+        if (reading_reply) {
+            req = current_req;
+            req->reply_len = reply_ptr - req->reply;
+            if (req->data[0] == ADB_PACKET) {
+                /* Have to adjust the reply from ADB commands */
+                if (req->reply_len <= 2 || (req->reply[1] & 2) != 0) {
+                    /* the 0x2 bit indicates no response */
+                    req->reply_len = 0;
+                } else {
+                    /* leave just the command and result bytes in the reply */
+                    req->reply_len -= 2;
+                    memmove(req->reply, req->reply + 2, req->reply_len);
+                }
+            }
+            current_req = req->next;
+            complete = 1;
+        } else {
+            /* This is tricky. We must break the spinlock to call
+             * cuda_input. However, doing so means we might get
+             * re-entered from another CPU getting an interrupt
+             * or calling cuda_poll(). I ended up using the stack
+             * (it's only for 16 bytes) and moving the actual
+             * call to cuda_input to outside of the lock.
+             */
+            ibuf_len = reply_ptr - cuda_rbuf;
+            memcpy(ibuf, cuda_rbuf, ibuf_len);
+        }
+        if (status == TREQ) {
+            out_8(&via[B], in_8(&via[B]) & ~TIP);
+            cuda_state = reading;
+            reply_ptr = cuda_rbuf;
+            reading_reply = 0;
+        } else {
+            cuda_state = idle;
+            cuda_start();
+        }
+        break;
+
+    default:
+        printk("cuda_interrupt: unknown cuda_state %d?\n", cuda_state);
+    }
+    spin_unlock(&cuda_lock);
+    if (complete && req) {
+        void (*done)(struct adb_request *) = req->done;
+        mb();
+        req->complete = 1;
+        /* Here, we assume that if the request has a done member, the
+         * struct request will survive to setting req->complete to 1
+         */
+        if (done)
+                (*done)(req);
+    }
+    if (ibuf_len)
+        cuda_input(ibuf, ibuf_len, regs);
+    return IRQ_HANDLED;
+}
+
+static void
+cuda_input(unsigned char *buf, int nb, struct pt_regs *regs)
+{
+    int i;
+
+    switch (buf[0]) {
+    case ADB_PACKET:
+#ifdef CONFIG_XMON
+        if (nb == 5 && buf[2] == 0x2c) {
+            extern int xmon_wants_key, xmon_adb_keycode;
+            if (xmon_wants_key) {
+                xmon_adb_keycode = buf[3];
+                return;
+            }
+        }
+#endif /* CONFIG_XMON */
+#ifdef CONFIG_ADB
+        adb_input(buf+2, nb-2, regs, buf[1] & 0x40);
+#endif /* CONFIG_ADB */
+        break;
+
+    default:
+        printk("data from cuda (%d bytes):", nb);
+        for (i = 0; i < nb; ++i)
+            printk(" %.2x", buf[i]);
+        printk("\n");
+    }
+}