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qemu/hw/pl061.c

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/*
* Arm PrimeCell PL061 General Purpose IO with additional
* Luminary Micro Stellaris bits.
*
* Copyright (c) 2007 CodeSourcery.
* Written by Paul Brook
*
* This code is licensed under the GPL.
*/
#include "sysbus.h"
//#define DEBUG_PL061 1
#ifdef DEBUG_PL061
#define DPRINTF(fmt, ...) \
do { printf("pl061: " fmt , ## __VA_ARGS__); } while (0)
#define BADF(fmt, ...) \
do { fprintf(stderr, "pl061: error: " fmt , ## __VA_ARGS__); exit(1);} while (0)
#else
#define DPRINTF(fmt, ...) do {} while(0)
#define BADF(fmt, ...) \
do { fprintf(stderr, "pl061: error: " fmt , ## __VA_ARGS__);} while (0)
#endif
static const uint8_t pl061_id[12] =
{ 0x00, 0x00, 0x00, 0x00, 0x61, 0x10, 0x04, 0x00, 0x0d, 0xf0, 0x05, 0xb1 };
static const uint8_t pl061_id_luminary[12] =
{ 0x00, 0x00, 0x00, 0x00, 0x61, 0x00, 0x18, 0x01, 0x0d, 0xf0, 0x05, 0xb1 };
typedef struct {
SysBusDevice busdev;
int locked;
uint8_t data;
uint8_t old_data;
uint8_t dir;
uint8_t isense;
uint8_t ibe;
uint8_t iev;
uint8_t im;
uint8_t istate;
uint8_t afsel;
uint8_t dr2r;
uint8_t dr4r;
uint8_t dr8r;
uint8_t odr;
uint8_t pur;
uint8_t pdr;
uint8_t slr;
uint8_t den;
uint8_t cr;
uint8_t float_high;
qemu_irq irq;
qemu_irq out[8];
const unsigned char *id;
} pl061_state;
static void pl061_update(pl061_state *s)
{
uint8_t changed;
uint8_t mask;
uint8_t out;
int i;
/* Outputs float high. */
/* FIXME: This is board dependent. */
out = (s->data & s->dir) | ~s->dir;
changed = s->old_data ^ out;
if (!changed)
return;
s->old_data = out;
for (i = 0; i < 8; i++) {
mask = 1 << i;
if ((changed & mask) && s->out) {
DPRINTF("Set output %d = %d\n", i, (out & mask) != 0);
qemu_set_irq(s->out[i], (out & mask) != 0);
}
}
/* FIXME: Implement input interrupts. */
}
static uint32_t pl061_read(void *opaque, target_phys_addr_t offset)
{
pl061_state *s = (pl061_state *)opaque;
if (offset >= 0xfd0 && offset < 0x1000) {
return s->id[(offset - 0xfd0) >> 2];
}
if (offset < 0x400) {
return s->data & (offset >> 2);
}
switch (offset) {
case 0x400: /* Direction */
return s->dir;
case 0x404: /* Interrupt sense */
return s->isense;
case 0x408: /* Interrupt both edges */
return s->ibe;
case 0x40c: /* Interrupt event */
return s->iev;
case 0x410: /* Interrupt mask */
return s->im;
case 0x414: /* Raw interrupt status */
return s->istate;
case 0x418: /* Masked interrupt status */
return s->istate | s->im;
case 0x420: /* Alternate function select */
return s->afsel;
case 0x500: /* 2mA drive */
return s->dr2r;
case 0x504: /* 4mA drive */
return s->dr4r;
case 0x508: /* 8mA drive */
return s->dr8r;
case 0x50c: /* Open drain */
return s->odr;
case 0x510: /* Pull-up */
return s->pur;
case 0x514: /* Pull-down */
return s->pdr;
case 0x518: /* Slew rate control */
return s->slr;
case 0x51c: /* Digital enable */
return s->den;
case 0x520: /* Lock */
return s->locked;
case 0x524: /* Commit */
return s->cr;
default:
hw_error("pl061_read: Bad offset %x\n", (int)offset);
return 0;
}
}
static void pl061_write(void *opaque, target_phys_addr_t offset,
uint32_t value)
{
pl061_state *s = (pl061_state *)opaque;
uint8_t mask;
if (offset < 0x400) {
mask = (offset >> 2) & s->dir;
s->data = (s->data & ~mask) | (value & mask);
pl061_update(s);
return;
}
switch (offset) {
case 0x400: /* Direction */
s->dir = value;
break;
case 0x404: /* Interrupt sense */
s->isense = value;
break;
case 0x408: /* Interrupt both edges */
s->ibe = value;
break;
case 0x40c: /* Interrupt event */
s->iev = value;
break;
case 0x410: /* Interrupt mask */
s->im = value;
break;
case 0x41c: /* Interrupt clear */
s->istate &= ~value;
break;
case 0x420: /* Alternate function select */
mask = s->cr;
s->afsel = (s->afsel & ~mask) | (value & mask);
break;
case 0x500: /* 2mA drive */
s->dr2r = value;
break;
case 0x504: /* 4mA drive */
s->dr4r = value;
break;
case 0x508: /* 8mA drive */
s->dr8r = value;
break;
case 0x50c: /* Open drain */
s->odr = value;
break;
case 0x510: /* Pull-up */
s->pur = value;
break;
case 0x514: /* Pull-down */
s->pdr = value;
break;
case 0x518: /* Slew rate control */
s->slr = value;
break;
case 0x51c: /* Digital enable */
s->den = value;
break;
case 0x520: /* Lock */
s->locked = (value != 0xacce551);
break;
case 0x524: /* Commit */
if (!s->locked)
s->cr = value;
break;
default:
hw_error("pl061_write: Bad offset %x\n", (int)offset);
}
pl061_update(s);
}
static void pl061_reset(pl061_state *s)
{
s->locked = 1;
s->cr = 0xff;
}
static void pl061_set_irq(void * opaque, int irq, int level)
{
pl061_state *s = (pl061_state *)opaque;
uint8_t mask;
mask = 1 << irq;
if ((s->dir & mask) == 0) {
s->data &= ~mask;
if (level)
s->data |= mask;
pl061_update(s);
}
}
static CPUReadMemoryFunc * const pl061_readfn[] = {
pl061_read,
pl061_read,
pl061_read
};
static CPUWriteMemoryFunc * const pl061_writefn[] = {
pl061_write,
pl061_write,
pl061_write
};
static void pl061_save(QEMUFile *f, void *opaque)
{
pl061_state *s = (pl061_state *)opaque;
qemu_put_be32(f, s->locked);
qemu_put_be32(f, s->data);
qemu_put_be32(f, s->old_data);
qemu_put_be32(f, s->dir);
qemu_put_be32(f, s->isense);
qemu_put_be32(f, s->ibe);
qemu_put_be32(f, s->iev);
qemu_put_be32(f, s->im);
qemu_put_be32(f, s->istate);
qemu_put_be32(f, s->afsel);
qemu_put_be32(f, s->dr2r);
qemu_put_be32(f, s->dr4r);
qemu_put_be32(f, s->dr8r);
qemu_put_be32(f, s->odr);
qemu_put_be32(f, s->pur);
qemu_put_be32(f, s->pdr);
qemu_put_be32(f, s->slr);
qemu_put_be32(f, s->den);
qemu_put_be32(f, s->cr);
qemu_put_be32(f, s->float_high);
}
static int pl061_load(QEMUFile *f, void *opaque, int version_id)
{
pl061_state *s = (pl061_state *)opaque;
if (version_id != 1)
return -EINVAL;
s->locked = qemu_get_be32(f);
s->data = qemu_get_be32(f);
s->old_data = qemu_get_be32(f);
s->dir = qemu_get_be32(f);
s->isense = qemu_get_be32(f);
s->ibe = qemu_get_be32(f);
s->iev = qemu_get_be32(f);
s->im = qemu_get_be32(f);
s->istate = qemu_get_be32(f);
s->afsel = qemu_get_be32(f);
s->dr2r = qemu_get_be32(f);
s->dr4r = qemu_get_be32(f);
s->dr8r = qemu_get_be32(f);
s->odr = qemu_get_be32(f);
s->pur = qemu_get_be32(f);
s->pdr = qemu_get_be32(f);
s->slr = qemu_get_be32(f);
s->den = qemu_get_be32(f);
s->cr = qemu_get_be32(f);
s->float_high = qemu_get_be32(f);
return 0;
}
static int pl061_init(SysBusDevice *dev, const unsigned char *id)
{
int iomemtype;
pl061_state *s = FROM_SYSBUS(pl061_state, dev);
s->id = id;
iomemtype = cpu_register_io_memory(pl061_readfn,
pl061_writefn, s,
DEVICE_NATIVE_ENDIAN);
sysbus_init_mmio(dev, 0x1000, iomemtype);
sysbus_init_irq(dev, &s->irq);
qdev_init_gpio_in(&dev->qdev, pl061_set_irq, 8);
qdev_init_gpio_out(&dev->qdev, s->out, 8);
pl061_reset(s);
register_savevm(&dev->qdev, "pl061_gpio", -1, 1, pl061_save, pl061_load, s);
return 0;
}
static int pl061_init_luminary(SysBusDevice *dev)
{
return pl061_init(dev, pl061_id_luminary);
}
static int pl061_init_arm(SysBusDevice *dev)
{
return pl061_init(dev, pl061_id);
}
static void pl061_register_devices(void)
{
sysbus_register_dev("pl061", sizeof(pl061_state),
pl061_init_arm);
sysbus_register_dev("pl061_luminary", sizeof(pl061_state),
pl061_init_luminary);
}
device_init(pl061_register_devices)
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