Syborg (Symbian Virtual Platform) board

A virtual reference platform for SymbianOS development/debugging.

Signed-off-by: Paul Brook <paul@codesourcery.com>

hw/syborg_timer.c

@@ -0,0 +1,235 @@
+/*
+ * Syborg Interval Timer.
+ *
+ * Copyright (c) 2008 CodeSourcery
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "sysbus.h"
+#include "qemu-timer.h"
+#include "syborg.h"
+
+//#define DEBUG_SYBORG_TIMER
+
+#ifdef DEBUG_SYBORG_TIMER
+#define DPRINTF(fmt, ...) \
+do { printf("syborg_timer: " fmt , ##args); } while (0)
+#define BADF(fmt, ...) \
+do { fprintf(stderr, "syborg_timer: error: " fmt , ## __VA_ARGS__); \
+    exit(1);} while (0)
+#else
+#define DPRINTF(fmt, ...) do {} while(0)
+#define BADF(fmt, ...) \
+do { fprintf(stderr, "syborg_timer: error: " fmt , ## __VA_ARGS__);} while (0)
+#endif
+
+enum {
+    TIMER_ID          = 0,
+    TIMER_RUNNING     = 1,
+    TIMER_ONESHOT     = 2,
+    TIMER_LIMIT       = 3,
+    TIMER_VALUE       = 4,
+    TIMER_INT_ENABLE  = 5,
+    TIMER_INT_STATUS  = 6,
+    TIMER_FREQ        = 7
+};
+
+typedef struct {
+    SysBusDevice busdev;
+    ptimer_state *timer;
+    int running;
+    int oneshot;
+    uint32_t limit;
+    uint32_t freq;
+    uint32_t int_level;
+    uint32_t int_enabled;
+    qemu_irq irq;
+} SyborgTimerState;
+
+static void syborg_timer_update(SyborgTimerState *s)
+{
+    /* Update interrupt.  */
+    if (s->int_level && s->int_enabled) {
+        qemu_irq_raise(s->irq);
+    } else {
+        qemu_irq_lower(s->irq);
+    }
+}
+
+static void syborg_timer_tick(void *opaque)
+{
+    SyborgTimerState *s = (SyborgTimerState *)opaque;
+    //DPRINTF("Timer Tick\n");
+    s->int_level = 1;
+    if (s->oneshot)
+        s->running = 0;
+    syborg_timer_update(s);
+}
+
+static uint32_t syborg_timer_read(void *opaque, target_phys_addr_t offset)
+{
+    SyborgTimerState *s = (SyborgTimerState *)opaque;
+
+    DPRINTF("Reg read %d\n", (int)offset);
+    offset &= 0xfff;
+    switch (offset >> 2) {
+    case TIMER_ID:
+        return SYBORG_ID_TIMER;
+    case TIMER_RUNNING:
+        return s->running;
+    case TIMER_ONESHOT:
+        return s->oneshot;
+    case TIMER_LIMIT:
+        return s->limit;
+    case TIMER_VALUE:
+        return ptimer_get_count(s->timer);
+    case TIMER_INT_ENABLE:
+        return s->int_enabled;
+    case TIMER_INT_STATUS:
+        return s->int_level;
+    case TIMER_FREQ:
+        return s->freq;
+    default:
+        cpu_abort(cpu_single_env, "syborg_timer_read: Bad offset %x\n",
+                  (int)offset);
+        return 0;
+    }
+}
+
+static void syborg_timer_write(void *opaque, target_phys_addr_t offset,
+                               uint32_t value)
+{
+    SyborgTimerState *s = (SyborgTimerState *)opaque;
+
+    DPRINTF("Reg write %d\n", (int)offset);
+    offset &= 0xfff;
+    switch (offset >> 2) {
+    case TIMER_RUNNING:
+        if (value == s->running)
+            break;
+        s->running = value;
+        if (value) {
+            ptimer_run(s->timer, s->oneshot);
+        } else {
+            ptimer_stop(s->timer);
+        }
+        break;
+    case TIMER_ONESHOT:
+        if (s->running) {
+            ptimer_stop(s->timer);
+        }
+        s->oneshot = value;
+        if (s->running) {
+            ptimer_run(s->timer, s->oneshot);
+        }
+        break;
+    case TIMER_LIMIT:
+        s->limit = value;
+        ptimer_set_limit(s->timer, value, 1);
+        break;
+    case TIMER_VALUE:
+        ptimer_set_count(s->timer, value);
+        break;
+    case TIMER_INT_ENABLE:
+        s->int_enabled = value;
+        syborg_timer_update(s);
+        break;
+    case TIMER_INT_STATUS:
+        s->int_level &= ~value;
+        syborg_timer_update(s);
+        break;
+    default:
+        cpu_abort(cpu_single_env, "syborg_timer_write: Bad offset %x\n",
+                  (int)offset);
+        break;
+    }
+}
+
+static CPUReadMemoryFunc *syborg_timer_readfn[] = {
+    syborg_timer_read,
+    syborg_timer_read,
+    syborg_timer_read
+};
+
+static CPUWriteMemoryFunc *syborg_timer_writefn[] = {
+    syborg_timer_write,
+    syborg_timer_write,
+    syborg_timer_write
+};
+
+static void syborg_timer_save(QEMUFile *f, void *opaque)
+{
+    SyborgTimerState *s = opaque;
+
+    qemu_put_be32(f, s->running);
+    qemu_put_be32(f, s->oneshot);
+    qemu_put_be32(f, s->limit);
+    qemu_put_be32(f, s->int_level);
+    qemu_put_be32(f, s->int_enabled);
+    qemu_put_ptimer(f, s->timer);
+}
+
+static int syborg_timer_load(QEMUFile *f, void *opaque, int version_id)
+{
+    SyborgTimerState *s = opaque;
+
+    if (version_id != 1)
+        return -EINVAL;
+
+    s->running = qemu_get_be32(f);
+    s->oneshot = qemu_get_be32(f);
+    s->limit = qemu_get_be32(f);
+    s->int_level = qemu_get_be32(f);
+    s->int_enabled = qemu_get_be32(f);
+    qemu_get_ptimer(f, s->timer);
+
+    return 0;
+}
+
+static void syborg_timer_init(SysBusDevice *dev)
+{
+    SyborgTimerState *s = FROM_SYSBUS(SyborgTimerState, dev);
+    QEMUBH *bh;
+    int iomemtype;
+
+    s->freq = qdev_get_prop_int(&dev->qdev, "frequency", 0);
+    if (s->freq == 0) {
+        fprintf(stderr, "syborg_timer: Zero/unset frequency\n");
+        exit(1);
+    }
+    sysbus_init_irq(dev, &s->irq);
+    iomemtype = cpu_register_io_memory(0, syborg_timer_readfn,
+                                       syborg_timer_writefn, s);
+    sysbus_init_mmio(dev, 0x1000, iomemtype);
+
+    bh = qemu_bh_new(syborg_timer_tick, s);
+    s->timer = ptimer_init(bh);
+    ptimer_set_freq(s->timer, s->freq);
+    register_savevm("syborg_timer", -1, 1,
+                    syborg_timer_save, syborg_timer_load, s);
+}
+
+static void syborg_timer_register_devices(void)
+{
+    sysbus_register_dev("syborg,timer", sizeof(SyborgTimerState),
+                        syborg_timer_init);
+}
+
+device_init(syborg_timer_register_devices)