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qemu/hw/pxa2xx_gpio.c

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/*
* 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.h"
#include "pxa.h"
#define PXA2XX_GPIO_BANKS 4
struct PXA2xxGPIOInfo {
qemu_irq *pic;
int lines;
CPUState *cpu_env;
qemu_irq *in;
/* 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->pic[PXA2XX_PIC_GPIO_0]);
else
qemu_irq_lower(s->pic[PXA2XX_PIC_GPIO_0]);
if (s->status[0] & (1 << 1))
qemu_irq_raise(s->pic[PXA2XX_PIC_GPIO_1]);
else
qemu_irq_lower(s->pic[PXA2XX_PIC_GPIO_1]);
if ((s->status[0] & ~3) | s->status[1] | s->status[2] | s->status[3])
qemu_irq_raise(s->pic[PXA2XX_PIC_GPIO_X]);
else
qemu_irq_lower(s->pic[PXA2XX_PIC_GPIO_X]);
}
/* 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 uint32_t pxa2xx_gpio_read(void *opaque, target_phys_addr_t offset)
{
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,
target_phys_addr_t offset, uint32_t value)
{
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 CPUReadMemoryFunc * const pxa2xx_gpio_readfn[] = {
pxa2xx_gpio_read,
pxa2xx_gpio_read,
pxa2xx_gpio_read
};
static CPUWriteMemoryFunc * const pxa2xx_gpio_writefn[] = {
pxa2xx_gpio_write,
pxa2xx_gpio_write,
pxa2xx_gpio_write
};
static void pxa2xx_gpio_save(QEMUFile *f, void *opaque)
{
PXA2xxGPIOInfo *s = (PXA2xxGPIOInfo *) opaque;
int i;
qemu_put_be32(f, s->lines);
for (i = 0; i < PXA2XX_GPIO_BANKS; i ++) {
qemu_put_be32s(f, &s->ilevel[i]);
qemu_put_be32s(f, &s->olevel[i]);
qemu_put_be32s(f, &s->dir[i]);
qemu_put_be32s(f, &s->rising[i]);
qemu_put_be32s(f, &s->falling[i]);
qemu_put_be32s(f, &s->status[i]);
qemu_put_be32s(f, &s->gafr[i * 2 + 0]);
qemu_put_be32s(f, &s->gafr[i * 2 + 1]);
qemu_put_be32s(f, &s->prev_level[i]);
}
}
static int pxa2xx_gpio_load(QEMUFile *f, void *opaque, int version_id)
{
PXA2xxGPIOInfo *s = (PXA2xxGPIOInfo *) opaque;
int i;
if (qemu_get_be32(f) != s->lines)
return -EINVAL;
for (i = 0; i < PXA2XX_GPIO_BANKS; i ++) {
qemu_get_be32s(f, &s->ilevel[i]);
qemu_get_be32s(f, &s->olevel[i]);
qemu_get_be32s(f, &s->dir[i]);
qemu_get_be32s(f, &s->rising[i]);
qemu_get_be32s(f, &s->falling[i]);
qemu_get_be32s(f, &s->status[i]);
qemu_get_be32s(f, &s->gafr[i * 2 + 0]);
qemu_get_be32s(f, &s->gafr[i * 2 + 1]);
qemu_get_be32s(f, &s->prev_level[i]);
}
return 0;
}
PXA2xxGPIOInfo *pxa2xx_gpio_init(target_phys_addr_t base,
CPUState *env, qemu_irq *pic, int lines)
{
int iomemtype;
PXA2xxGPIOInfo *s;
s = (PXA2xxGPIOInfo *)
qemu_mallocz(sizeof(PXA2xxGPIOInfo));
memset(s, 0, sizeof(PXA2xxGPIOInfo));
s->pic = pic;
s->lines = lines;
s->cpu_env = env;
s->in = qemu_allocate_irqs(pxa2xx_gpio_set, s, lines);
iomemtype = cpu_register_io_memory(pxa2xx_gpio_readfn,
pxa2xx_gpio_writefn, s);
cpu_register_physical_memory(base, 0x00001000, iomemtype);
register_savevm(NULL, "pxa2xx_gpio", 0, 0,
pxa2xx_gpio_save, pxa2xx_gpio_load, s);
return s;
}
qemu_irq *pxa2xx_gpio_in_get(PXA2xxGPIOInfo *s)
{
return s->in;
}
void pxa2xx_gpio_out_set(PXA2xxGPIOInfo *s,
int line, qemu_irq handler)
{
if (line >= s->lines) {
printf("%s: No GPIO pin %i\n", __FUNCTION__, line);
return;
}
s->handler[line] = handler;
}
/*
* 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(PXA2xxGPIOInfo *s, qemu_irq handler)
{
s->read_notify = handler;
}
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