Add OMAP Shared GPIO module.

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3473 c046a42c-6fe2-441c-8c8c-71466251a162

1 files changed, 177 insertions, 0 deletions

diff --git a/hw/omap.c b/hw/omap.c
index f8c2073da9..a2a18a406c 100644
--- a/hw/omap.c
+++ b/hw/omap.c
@@ -3065,6 +3065,179 @@ void omap_mpuio_key(struct omap_mpuio_s *s, int row, int col, int down)
     omap_mpuio_kbd_update(s);
 }
 
+/* General-Purpose I/O */
+struct omap_gpio_s {
+    target_phys_addr_t base;
+    qemu_irq irq;
+    qemu_irq *in;
+    qemu_irq handler[16];
+
+    uint16_t inputs;
+    uint16_t outputs;
+    uint16_t dir;
+    uint16_t edge;
+    uint16_t mask;
+    uint16_t ints;
+};
+
+static void omap_gpio_set(void *opaque, int line, int level)
+{
+    struct omap_gpio_s *s = (struct omap_gpio_s *) opaque;
+    uint16_t prev = s->inputs;
+
+    if (level)
+        s->inputs |= 1 << line;
+    else
+        s->inputs &= ~(1 << line);
+
+    if (((s->edge & s->inputs & ~prev) | (~s->edge & ~s->inputs & prev)) &
+                    (1 << line) & s->dir & ~s->mask) {
+        s->ints |= 1 << line;
+        qemu_irq_raise(s->irq);
+    }
+}
+
+static uint32_t omap_gpio_read(void *opaque, target_phys_addr_t addr)
+{
+    struct omap_gpio_s *s = (struct omap_gpio_s *) opaque;
+    int offset = addr - s->base;
+    uint16_t ret;
+
+    switch (offset) {
+    case 0x00:	/* DATA_INPUT */
+        return s->inputs;
+
+    case 0x04:	/* DATA_OUTPUT */
+        return s->outputs;
+
+    case 0x08:	/* DIRECTION_CONTROL */
+        return s->dir;
+
+    case 0x0c:	/* INTERRUPT_CONTROL */
+        return s->edge;
+
+    case 0x10:	/* INTERRUPT_MASK */
+        return s->mask;
+
+    case 0x14:	/* INTERRUPT_STATUS */
+        return s->ints;
+    }
+
+    OMAP_BAD_REG(addr);
+    return 0;
+}
+
+static void omap_gpio_write(void *opaque, target_phys_addr_t addr,
+                uint32_t value)
+{
+    struct omap_gpio_s *s = (struct omap_gpio_s *) opaque;
+    int offset = addr - s->base;
+    uint16_t diff;
+    int ln;
+
+    switch (offset) {
+    case 0x00:	/* DATA_INPUT */
+        OMAP_RO_REG(addr);
+        return;
+
+    case 0x04:	/* DATA_OUTPUT */
+        diff = s->outputs ^ (value & ~s->dir);
+        s->outputs = value;
+	value &= ~s->dir;
+        while ((ln = ffs(diff))) {
+            ln --;
+            if (s->handler[ln])
+                qemu_set_irq(s->handler[ln], (value >> ln) & 1);
+            diff &= ~(1 << ln);
+        }
+        break;
+
+    case 0x08:	/* DIRECTION_CONTROL */
+        diff = s->outputs & (s->dir ^ value);
+        s->dir = value;
+
+        value = s->outputs & ~s->dir;
+        while ((ln = ffs(diff))) {
+            ln --;
+            if (s->handler[ln])
+                qemu_set_irq(s->handler[ln], (value >> ln) & 1);
+            diff &= ~(1 << ln);
+        }
+        break;
+
+    case 0x0c:	/* INTERRUPT_CONTROL */
+        s->edge = value;
+        break;
+
+    case 0x10:	/* INTERRUPT_MASK */
+        s->mask = value;
+        break;
+
+    case 0x14:	/* INTERRUPT_STATUS */
+        s->ints &= ~value;
+        if (!s->ints)
+            qemu_irq_lower(s->irq);
+        break;
+
+    default:
+        OMAP_BAD_REG(addr);
+        return;
+    }
+}
+
+static CPUReadMemoryFunc *omap_gpio_readfn[] = {
+    omap_gpio_read,
+    omap_badwidth_read32,
+    omap_badwidth_read32,
+};
+
+static CPUWriteMemoryFunc *omap_gpio_writefn[] = {
+    omap_gpio_write,
+    omap_badwidth_write32,
+    omap_badwidth_write32,
+};
+
+void omap_gpio_reset(struct omap_gpio_s *s)
+{
+    s->inputs = 0;
+    s->outputs = ~0;
+    s->dir = ~0;
+    s->edge = ~0;
+    s->mask = ~0;
+    s->ints = 0;
+}
+
+struct omap_gpio_s *omap_gpio_init(target_phys_addr_t base,
+                qemu_irq irq, omap_clk clk)
+{
+    int iomemtype;
+    struct omap_gpio_s *s = (struct omap_gpio_s *)
+            qemu_mallocz(sizeof(struct omap_gpio_s));
+
+    s->base = base;
+    s->irq = irq;
+    s->in = qemu_allocate_irqs(omap_gpio_set, s, 16);
+    omap_gpio_reset(s);
+
+    iomemtype = cpu_register_io_memory(0, omap_gpio_readfn,
+                    omap_gpio_writefn, s);
+    cpu_register_physical_memory(s->base, 0x1000, iomemtype);
+
+    return s;
+}
+
+qemu_irq *omap_gpio_in_get(struct omap_gpio_s *s)
+{
+    return s->in;
+}
+
+void omap_gpio_out_set(struct omap_gpio_s *s, int line, qemu_irq handler)
+{
+    if (line >= 16 || line < 0)
+        cpu_abort(cpu_single_env, "%s: No GPIO line %i\n", __FUNCTION__, line);
+    s->handler[line] = handler;
+}
+
 /* General chip reset */
 static void omap_mpu_reset(void *opaque)
 {
@@ -3093,6 +3266,7 @@ static void omap_mpu_reset(void *opaque)
     omap_uart_reset(mpu->uart3);
     omap_mmc_reset(mpu->mmc);
     omap_mpuio_reset(mpu->mpuio);
+    omap_gpio_reset(mpu->gpio);
     cpu_reset(mpu->env);
 }
 
@@ -3208,6 +3382,9 @@ struct omap_mpu_state_s *omap310_mpu_init(unsigned long sdram_size,
                     s->irq[1][OMAP_INT_KEYBOARD], s->irq[1][OMAP_INT_MPUIO],
                     s->wakeup, omap_findclk(s, "clk32-kHz"));
 
+    s->gpio = omap_gpio_init(0xfffcf000, s->irq[1][OMAP_INT_KEYBOARD],
+                    omap_findclk(s, "mpuper_ck"));
+
     qemu_register_reset(omap_mpu_reset, s);
 
     return s;