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qemu/hw/pl061.c
Alexander Graf 2507c12ab0 Add endianness as io mem parameter 
As stated before, devices can be little, big or native endian. The
target endianness is not of their concern, so we need to push things
down a level.

This patch adds a parameter to cpu_register_io_memory that allows a
device to choose its endianness. For now, all devices simply choose
native endian, because that's the same behavior as before.

Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2010-12-11 15:24:25 +00:00

318 lines
7.8 KiB
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 licenced 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, 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];
} 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 pl061_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: /* Interupt 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: /* Interupt 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)
{
int iomemtype;
pl061_state *s = FROM_SYSBUS(pl061_state, dev);
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 void pl061_register_devices(void)
{
sysbus_register_dev("pl061", sizeof(pl061_state),
pl061_init);
}
device_init(pl061_register_devices)
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