Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
tree: 6d85df9c59
Fetching contributors…

Cannot retrieve contributors at this time

287 lines (262 sloc) 7.551 kb
/*
* ARM MPCore internal peripheral emulation (common code).
*
* Copyright (c) 2006-2007 CodeSourcery.
* Written by Paul Brook
*
* This code is licenced under the GPL.
*/
#include "sysbus.h"
#include "qemu-timer.h"
#define NCPU 4
static inline int
gic_get_current_cpu(void)
{
return cpu_single_env->cpu_index;
}
#include "arm_gic.c"
/* MPCore private memory region. */
typedef struct {
uint32_t count;
uint32_t load;
uint32_t control;
uint32_t status;
uint32_t old_status;
int64_t tick;
QEMUTimer *timer;
struct mpcore_priv_state *mpcore;
int id; /* Encodes both timer/watchdog and CPU. */
} mpcore_timer_state;
typedef struct mpcore_priv_state {
gic_state gic;
uint32_t scu_control;
int iomemtype;
mpcore_timer_state timer[8];
uint32_t num_cpu;
} mpcore_priv_state;
/* Per-CPU Timers. */
static inline void mpcore_timer_update_irq(mpcore_timer_state *s)
{
if (s->status & ~s->old_status) {
gic_set_pending_private(&s->mpcore->gic, s->id >> 1, 29 + (s->id & 1));
}
s->old_status = s->status;
}
/* Return conversion factor from mpcore timer ticks to qemu timer ticks. */
static inline uint32_t mpcore_timer_scale(mpcore_timer_state *s)
{
return (((s->control >> 8) & 0xff) + 1) * 10;
}
static void mpcore_timer_reload(mpcore_timer_state *s, int restart)
{
if (s->count == 0)
return;
if (restart)
s->tick = qemu_get_clock(vm_clock);
s->tick += (int64_t)s->count * mpcore_timer_scale(s);
qemu_mod_timer(s->timer, s->tick);
}
static void mpcore_timer_tick(void *opaque)
{
mpcore_timer_state *s = (mpcore_timer_state *)opaque;
s->status = 1;
if (s->control & 2) {
s->count = s->load;
mpcore_timer_reload(s, 0);
} else {
s->count = 0;
}
mpcore_timer_update_irq(s);
}
static uint32_t mpcore_timer_read(mpcore_timer_state *s, int offset)
{
int64_t val;
switch (offset) {
case 0: /* Load */
return s->load;
/* Fall through. */
case 4: /* Counter. */
if (((s->control & 1) == 0) || (s->count == 0))
return 0;
/* Slow and ugly, but hopefully won't happen too often. */
val = s->tick - qemu_get_clock(vm_clock);
val /= mpcore_timer_scale(s);
if (val < 0)
val = 0;
return val;
case 8: /* Control. */
return s->control;
case 12: /* Interrupt status. */
return s->status;
default:
return 0;
}
}
static void mpcore_timer_write(mpcore_timer_state *s, int offset,
uint32_t value)
{
int64_t old;
switch (offset) {
case 0: /* Load */
s->load = value;
/* Fall through. */
case 4: /* Counter. */
if ((s->control & 1) && s->count) {
/* Cancel the previous timer. */
qemu_del_timer(s->timer);
}
s->count = value;
if (s->control & 1) {
mpcore_timer_reload(s, 1);
}
break;
case 8: /* Control. */
old = s->control;
s->control = value;
if (((old & 1) == 0) && (value & 1)) {
if (s->count == 0 && (s->control & 2))
s->count = s->load;
mpcore_timer_reload(s, 1);
}
break;
case 12: /* Interrupt status. */
s->status &= ~value;
mpcore_timer_update_irq(s);
break;
}
}
static void mpcore_timer_init(mpcore_priv_state *mpcore,
mpcore_timer_state *s, int id)
{
s->id = id;
s->mpcore = mpcore;
s->timer = qemu_new_timer(vm_clock, mpcore_timer_tick, s);
}
/* Per-CPU private memory mapped IO. */
static uint32_t mpcore_priv_read(void *opaque, target_phys_addr_t offset)
{
mpcore_priv_state *s = (mpcore_priv_state *)opaque;
int id;
offset &= 0xfff;
if (offset < 0x100) {
/* SCU */
switch (offset) {
case 0x00: /* Control. */
return s->scu_control;
case 0x04: /* Configuration. */
id = ((1 << s->num_cpu) - 1) << 4;
return id | (s->num_cpu - 1);
case 0x08: /* CPU status. */
return 0;
case 0x0c: /* Invalidate all. */
return 0;
default:
goto bad_reg;
}
} else if (offset < 0x600) {
/* Interrupt controller. */
if (offset < 0x200) {
id = gic_get_current_cpu();
} else {
id = (offset - 0x200) >> 8;
if (id >= s->num_cpu) {
return 0;
}
}
return gic_cpu_read(&s->gic, id, offset & 0xff);
} else if (offset < 0xb00) {
/* Timers. */
if (offset < 0x700) {
id = gic_get_current_cpu();
} else {
id = (offset - 0x700) >> 8;
if (id >= s->num_cpu) {
return 0;
}
}
id <<= 1;
if (offset & 0x20)
id++;
return mpcore_timer_read(&s->timer[id], offset & 0xf);
}
bad_reg:
hw_error("mpcore_priv_read: Bad offset %x\n", (int)offset);
return 0;
}
static void mpcore_priv_write(void *opaque, target_phys_addr_t offset,
uint32_t value)
{
mpcore_priv_state *s = (mpcore_priv_state *)opaque;
int id;
offset &= 0xfff;
if (offset < 0x100) {
/* SCU */
switch (offset) {
case 0: /* Control register. */
s->scu_control = value & 1;
break;
case 0x0c: /* Invalidate all. */
/* This is a no-op as cache is not emulated. */
break;
default:
goto bad_reg;
}
} else if (offset < 0x600) {
/* Interrupt controller. */
if (offset < 0x200) {
id = gic_get_current_cpu();
} else {
id = (offset - 0x200) >> 8;
}
if (id < s->num_cpu) {
gic_cpu_write(&s->gic, id, offset & 0xff, value);
}
} else if (offset < 0xb00) {
/* Timers. */
if (offset < 0x700) {
id = gic_get_current_cpu();
} else {
id = (offset - 0x700) >> 8;
}
if (id < s->num_cpu) {
id <<= 1;
if (offset & 0x20)
id++;
mpcore_timer_write(&s->timer[id], offset & 0xf, value);
}
return;
}
return;
bad_reg:
hw_error("mpcore_priv_read: Bad offset %x\n", (int)offset);
}
static CPUReadMemoryFunc * const mpcore_priv_readfn[] = {
mpcore_priv_read,
mpcore_priv_read,
mpcore_priv_read
};
static CPUWriteMemoryFunc * const mpcore_priv_writefn[] = {
mpcore_priv_write,
mpcore_priv_write,
mpcore_priv_write
};
static void mpcore_priv_map(SysBusDevice *dev, target_phys_addr_t base)
{
mpcore_priv_state *s = FROM_SYSBUSGIC(mpcore_priv_state, dev);
cpu_register_physical_memory(base, 0x1000, s->iomemtype);
cpu_register_physical_memory(base + 0x1000, 0x1000, s->gic.iomemtype);
}
static int mpcore_priv_init(SysBusDevice *dev)
{
mpcore_priv_state *s = FROM_SYSBUSGIC(mpcore_priv_state, dev);
int i;
gic_init(&s->gic, s->num_cpu);
s->iomemtype = cpu_register_io_memory(mpcore_priv_readfn,
mpcore_priv_writefn, s,
DEVICE_NATIVE_ENDIAN);
sysbus_init_mmio_cb(dev, 0x2000, mpcore_priv_map);
for (i = 0; i < s->num_cpu * 2; i++) {
mpcore_timer_init(s, &s->timer[i], i);
}
return 0;
}
Jump to Line
Something went wrong with that request. Please try again.