diff options
Diffstat (limited to 'hw/arm/pxa2xx_gpio.c')
| -rw-r--r-- | hw/arm/pxa2xx_gpio.c | 350 |
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 0000000..eef8411 --- /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) |