1 files changed, 350 insertions, 0 deletions
diff --git a/hw/arm/pxa2xx_gpio.c b/hw/arm/pxa2xx_gpio.c
new file mode 100644
index 000000000..eef8411e8
--- /dev/null
+++ b/hw/arm/pxa2xx_gpio.c
@@ -0,0 +1,350 @@
+/*
+ * Intel XScale PXA255/270 GPIO controller emulation.
+ *
+ * Copyright (c) 2006 Openedhand Ltd.
+ * Written by Andrzej Zaborowski <balrog@zabor.org>
+ *
+ * This code is licensed under the GPL.
+ */
+
+#include "hw/hw.h"
+#include "hw/sysbus.h"
+#include "hw/pxa.h"
+
+#define PXA2XX_GPIO_BANKS	4
+
+typedef struct PXA2xxGPIOInfo PXA2xxGPIOInfo;
+struct PXA2xxGPIOInfo {
+    SysBusDevice busdev;
+    MemoryRegion iomem;
+    qemu_irq irq0, irq1, irqX;
+    int lines;
+    int ncpu;
+    ARMCPU *cpu;
+
+    /* XXX: GNU C vectors are more suitable */
+    uint32_t ilevel[PXA2XX_GPIO_BANKS];
+    uint32_t olevel[PXA2XX_GPIO_BANKS];
+    uint32_t dir[PXA2XX_GPIO_BANKS];
+    uint32_t rising[PXA2XX_GPIO_BANKS];
+    uint32_t falling[PXA2XX_GPIO_BANKS];
+    uint32_t status[PXA2XX_GPIO_BANKS];
+    uint32_t gpsr[PXA2XX_GPIO_BANKS];
+    uint32_t gafr[PXA2XX_GPIO_BANKS * 2];
+
+    uint32_t prev_level[PXA2XX_GPIO_BANKS];
+    qemu_irq handler[PXA2XX_GPIO_BANKS * 32];
+    qemu_irq read_notify;
+};
+
+static struct {
+    enum {
+        GPIO_NONE,
+        GPLR,
+        GPSR,
+        GPCR,
+        GPDR,
+        GRER,
+        GFER,
+        GEDR,
+        GAFR_L,
+        GAFR_U,
+    } reg;
+    int bank;
+} pxa2xx_gpio_regs[0x200] = {
+    [0 ... 0x1ff] = { GPIO_NONE, 0 },
+#define PXA2XX_REG(reg, a0, a1, a2, a3)	\
+    [a0] = { reg, 0 }, [a1] = { reg, 1 }, [a2] = { reg, 2 }, [a3] = { reg, 3 },
+
+    PXA2XX_REG(GPLR, 0x000, 0x004, 0x008, 0x100)
+    PXA2XX_REG(GPSR, 0x018, 0x01c, 0x020, 0x118)
+    PXA2XX_REG(GPCR, 0x024, 0x028, 0x02c, 0x124)
+    PXA2XX_REG(GPDR, 0x00c, 0x010, 0x014, 0x10c)
+    PXA2XX_REG(GRER, 0x030, 0x034, 0x038, 0x130)
+    PXA2XX_REG(GFER, 0x03c, 0x040, 0x044, 0x13c)
+    PXA2XX_REG(GEDR, 0x048, 0x04c, 0x050, 0x148)
+    PXA2XX_REG(GAFR_L, 0x054, 0x05c, 0x064, 0x06c)
+    PXA2XX_REG(GAFR_U, 0x058, 0x060, 0x068, 0x070)
+};
+
+static void pxa2xx_gpio_irq_update(PXA2xxGPIOInfo *s)
+{
+    if (s->status[0] & (1 << 0))
+        qemu_irq_raise(s->irq0);
+    else
+        qemu_irq_lower(s->irq0);
+
+    if (s->status[0] & (1 << 1))
+        qemu_irq_raise(s->irq1);
+    else
+        qemu_irq_lower(s->irq1);
+
+    if ((s->status[0] & ~3) | s->status[1] | s->status[2] | s->status[3])
+        qemu_irq_raise(s->irqX);
+    else
+        qemu_irq_lower(s->irqX);
+}
+
+/* Bitmap of pins used as standby and sleep wake-up sources.  */
+static const int pxa2xx_gpio_wake[PXA2XX_GPIO_BANKS] = {
+    0x8003fe1b, 0x002001fc, 0xec080000, 0x0012007f,
+};
+
+static void pxa2xx_gpio_set(void *opaque, int line, int level)
+{
+    PXA2xxGPIOInfo *s = (PXA2xxGPIOInfo *) opaque;
+    int bank;
+    uint32_t mask;
+
+    if (line >= s->lines) {
+        printf("%s: No GPIO pin %i\n", __FUNCTION__, line);
+        return;
+    }
+
+    bank = line >> 5;
+    mask = 1 << (line & 31);
+
+    if (level) {
+        s->status[bank] |= s->rising[bank] & mask &
+                ~s->ilevel[bank] & ~s->dir[bank];
+        s->ilevel[bank] |= mask;
+    } else {
+        s->status[bank] |= s->falling[bank] & mask &
+                s->ilevel[bank] & ~s->dir[bank];
+        s->ilevel[bank] &= ~mask;
+    }
+
+    if (s->status[bank] & mask)
+        pxa2xx_gpio_irq_update(s);
+
+    /* Wake-up GPIOs */
+    if (s->cpu->env.halted && (mask & ~s->dir[bank] & pxa2xx_gpio_wake[bank])) {
+        cpu_interrupt(&s->cpu->env, CPU_INTERRUPT_EXITTB);
+    }
+}
+
+static void pxa2xx_gpio_handler_update(PXA2xxGPIOInfo *s) {
+    uint32_t level, diff;
+    int i, bit, line;
+    for (i = 0; i < PXA2XX_GPIO_BANKS; i ++) {
+        level = s->olevel[i] & s->dir[i];
+
+        for (diff = s->prev_level[i] ^ level; diff; diff ^= 1 << bit) {
+            bit = ffs(diff) - 1;
+            line = bit + 32 * i;
+            qemu_set_irq(s->handler[line], (level >> bit) & 1);
+        }
+
+        s->prev_level[i] = level;
+    }
+}
+
+static uint64_t pxa2xx_gpio_read(void *opaque, hwaddr offset,
+                                 unsigned size)
+{
+    PXA2xxGPIOInfo *s = (PXA2xxGPIOInfo *) opaque;
+    uint32_t ret;
+    int bank;
+    if (offset >= 0x200)
+        return 0;
+
+    bank = pxa2xx_gpio_regs[offset].bank;
+    switch (pxa2xx_gpio_regs[offset].reg) {
+    case GPDR:		/* GPIO Pin-Direction registers */
+        return s->dir[bank];
+
+    case GPSR:		/* GPIO Pin-Output Set registers */
+        printf("%s: Read from a write-only register " REG_FMT "\n",
+                        __FUNCTION__, offset);
+        return s->gpsr[bank];	/* Return last written value.  */
+
+    case GPCR:		/* GPIO Pin-Output Clear registers */
+        printf("%s: Read from a write-only register " REG_FMT "\n",
+                        __FUNCTION__, offset);
+        return 31337;		/* Specified as unpredictable in the docs.  */
+
+    case GRER:		/* GPIO Rising-Edge Detect Enable registers */
+        return s->rising[bank];
+
+    case GFER:		/* GPIO Falling-Edge Detect Enable registers */
+        return s->falling[bank];
+
+    case GAFR_L:	/* GPIO Alternate Function registers */
+        return s->gafr[bank * 2];
+
+    case GAFR_U:	/* GPIO Alternate Function registers */
+        return s->gafr[bank * 2 + 1];
+
+    case GPLR:		/* GPIO Pin-Level registers */
+        ret = (s->olevel[bank] & s->dir[bank]) |
+                (s->ilevel[bank] & ~s->dir[bank]);
+        qemu_irq_raise(s->read_notify);
+        return ret;
+
+    case GEDR:		/* GPIO Edge Detect Status registers */
+        return s->status[bank];
+
+    default:
+        hw_error("%s: Bad offset " REG_FMT "\n", __FUNCTION__, offset);
+    }
+
+    return 0;
+}
+
+static void pxa2xx_gpio_write(void *opaque, hwaddr offset,
+                              uint64_t value, unsigned size)
+{
+    PXA2xxGPIOInfo *s = (PXA2xxGPIOInfo *) opaque;
+    int bank;
+    if (offset >= 0x200)
+        return;
+
+    bank = pxa2xx_gpio_regs[offset].bank;
+    switch (pxa2xx_gpio_regs[offset].reg) {
+    case GPDR:		/* GPIO Pin-Direction registers */
+        s->dir[bank] = value;
+        pxa2xx_gpio_handler_update(s);
+        break;
+
+    case GPSR:		/* GPIO Pin-Output Set registers */
+        s->olevel[bank] |= value;
+        pxa2xx_gpio_handler_update(s);
+        s->gpsr[bank] = value;
+        break;
+
+    case GPCR:		/* GPIO Pin-Output Clear registers */
+        s->olevel[bank] &= ~value;
+        pxa2xx_gpio_handler_update(s);
+        break;
+
+    case GRER:		/* GPIO Rising-Edge Detect Enable registers */
+        s->rising[bank] = value;
+        break;
+
+    case GFER:		/* GPIO Falling-Edge Detect Enable registers */
+        s->falling[bank] = value;
+        break;
+
+    case GAFR_L:	/* GPIO Alternate Function registers */
+        s->gafr[bank * 2] = value;
+        break;
+
+    case GAFR_U:	/* GPIO Alternate Function registers */
+        s->gafr[bank * 2 + 1] = value;
+        break;
+
+    case GEDR:		/* GPIO Edge Detect Status registers */
+        s->status[bank] &= ~value;
+        pxa2xx_gpio_irq_update(s);
+        break;
+
+    default:
+        hw_error("%s: Bad offset " REG_FMT "\n", __FUNCTION__, offset);
+    }
+}
+
+static const MemoryRegionOps pxa_gpio_ops = {
+    .read = pxa2xx_gpio_read,
+    .write = pxa2xx_gpio_write,
+    .endianness = DEVICE_NATIVE_ENDIAN,
+};
+
+DeviceState *pxa2xx_gpio_init(hwaddr base,
+                              ARMCPU *cpu, DeviceState *pic, int lines)
+{
+    CPUState *cs = CPU(cpu);
+    DeviceState *dev;
+
+    dev = qdev_create(NULL, "pxa2xx-gpio");
+    qdev_prop_set_int32(dev, "lines", lines);
+    qdev_prop_set_int32(dev, "ncpu", cs->cpu_index);
+    qdev_init_nofail(dev);
+
+    sysbus_mmio_map(SYS_BUS_DEVICE(dev), 0, base);
+    sysbus_connect_irq(SYS_BUS_DEVICE(dev), 0,
+                    qdev_get_gpio_in(pic, PXA2XX_PIC_GPIO_0));
+    sysbus_connect_irq(SYS_BUS_DEVICE(dev), 1,
+                    qdev_get_gpio_in(pic, PXA2XX_PIC_GPIO_1));
+    sysbus_connect_irq(SYS_BUS_DEVICE(dev), 2,
+                    qdev_get_gpio_in(pic, PXA2XX_PIC_GPIO_X));
+
+    return dev;
+}
+
+static int pxa2xx_gpio_initfn(SysBusDevice *dev)
+{
+    PXA2xxGPIOInfo *s;
+
+    s = FROM_SYSBUS(PXA2xxGPIOInfo, dev);
+
+    s->cpu = ARM_CPU(qemu_get_cpu(s->ncpu));
+
+    qdev_init_gpio_in(&dev->qdev, pxa2xx_gpio_set, s->lines);
+    qdev_init_gpio_out(&dev->qdev, s->handler, s->lines);
+
+    memory_region_init_io(&s->iomem, &pxa_gpio_ops, s, "pxa2xx-gpio", 0x1000);
+    sysbus_init_mmio(dev, &s->iomem);
+    sysbus_init_irq(dev, &s->irq0);
+    sysbus_init_irq(dev, &s->irq1);
+    sysbus_init_irq(dev, &s->irqX);
+
+    return 0;
+}
+
+/*
+ * Registers a callback to notify on GPLR reads.  This normally
+ * shouldn't be needed but it is used for the hack on Spitz machines.
+ */
+void pxa2xx_gpio_read_notifier(DeviceState *dev, qemu_irq handler)
+{
+    PXA2xxGPIOInfo *s = FROM_SYSBUS(PXA2xxGPIOInfo, SYS_BUS_DEVICE(dev));
+    s->read_notify = handler;
+}
+
+static const VMStateDescription vmstate_pxa2xx_gpio_regs = {
+    .name = "pxa2xx-gpio",
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .minimum_version_id_old = 1,
+    .fields = (VMStateField []) {
+        VMSTATE_INT32(lines, PXA2xxGPIOInfo),
+        VMSTATE_UINT32_ARRAY(ilevel, PXA2xxGPIOInfo, PXA2XX_GPIO_BANKS),
+        VMSTATE_UINT32_ARRAY(olevel, PXA2xxGPIOInfo, PXA2XX_GPIO_BANKS),
+        VMSTATE_UINT32_ARRAY(dir, PXA2xxGPIOInfo, PXA2XX_GPIO_BANKS),
+        VMSTATE_UINT32_ARRAY(rising, PXA2xxGPIOInfo, PXA2XX_GPIO_BANKS),
+        VMSTATE_UINT32_ARRAY(falling, PXA2xxGPIOInfo, PXA2XX_GPIO_BANKS),
+        VMSTATE_UINT32_ARRAY(status, PXA2xxGPIOInfo, PXA2XX_GPIO_BANKS),
+        VMSTATE_UINT32_ARRAY(gafr, PXA2xxGPIOInfo, PXA2XX_GPIO_BANKS * 2),
+        VMSTATE_END_OF_LIST(),
+    },
+};
+
+static Property pxa2xx_gpio_properties[] = {
+    DEFINE_PROP_INT32("lines", PXA2xxGPIOInfo, lines, 0),
+    DEFINE_PROP_INT32("ncpu", PXA2xxGPIOInfo, ncpu, 0),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static void pxa2xx_gpio_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
+
+    k->init = pxa2xx_gpio_initfn;
+    dc->desc = "PXA2xx GPIO controller";
+    dc->props = pxa2xx_gpio_properties;
+}
+
+static const TypeInfo pxa2xx_gpio_info = {
+    .name          = "pxa2xx-gpio",
+    .parent        = TYPE_SYS_BUS_DEVICE,
+    .instance_size = sizeof(PXA2xxGPIOInfo),
+    .class_init    = pxa2xx_gpio_class_init,
+};
+
+static void pxa2xx_gpio_register_types(void)
+{
+    type_register_static(&pxa2xx_gpio_info);
+}
+
+type_init(pxa2xx_gpio_register_types)