hw/omap1.c : separate gpio module

Signed-off-by: cmchao <cmchao@gmail.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

1 files changed, 202 insertions, 0 deletions

diff --git a/hw/omap_gpio.c b/hw/omap_gpio.c
new file mode 100644
index 0000000..a162c1d
--- /dev/null
+++ b/hw/omap_gpio.c
@@ -0,0 +1,202 @@
+/*
+ * TI OMAP processors GPIO emulation.
+ *
+ * Copyright (C) 2006-2008 Andrzej Zaborowski  <balrog@zabor.org>
+ * Copyright (C) 2007-2009 Nokia Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 or
+ * (at your option) version 3 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "hw.h"
+#include "omap.h"
+/* General-Purpose I/O */
+struct omap_gpio_s {
+    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;
+    uint16_t pins;
+};
+
+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 & OMAP_MPUI_REG_MASK;
+
+    switch (offset) {
+    case 0x00:	/* DATA_INPUT */
+        return s->inputs & s->pins;
+
+    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;
+
+    case 0x18:	/* PIN_CONTROL (not in OMAP310) */
+        OMAP_BAD_REG(addr);
+        return s->pins;
+    }
+
+    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 & OMAP_MPUI_REG_MASK;
+    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;
+        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;
+
+    case 0x18:	/* PIN_CONTROL (not in OMAP310 TRM) */
+        OMAP_BAD_REG(addr);
+        s->pins = value;
+        break;
+
+    default:
+        OMAP_BAD_REG(addr);
+        return;
+    }
+}
+
+/* *Some* sources say the memory region is 32-bit.  */
+static CPUReadMemoryFunc * const omap_gpio_readfn[] = {
+    omap_badwidth_read16,
+    omap_gpio_read,
+    omap_badwidth_read16,
+};
+
+static CPUWriteMemoryFunc * const omap_gpio_writefn[] = {
+    omap_badwidth_write16,
+    omap_gpio_write,
+    omap_badwidth_write16,
+};
+
+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;
+    s->pins = ~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->irq = irq;
+    s->in = qemu_allocate_irqs(omap_gpio_set, s, 16);
+    omap_gpio_reset(s);
+
+    iomemtype = cpu_register_io_memory(omap_gpio_readfn,
+                    omap_gpio_writefn, s);
+    cpu_register_physical_memory(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)
+        hw_error("%s: No GPIO line %i\n", __FUNCTION__, line);
+    s->handler[line] = handler;
+}