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qemu/hw/timer/cadence_ttc.c
Johannes Schlatow a7ffaf5c96 Fix interval interrupt of cadence ttc when timer is in decrement mode 
The interval interrupt is not set if the timer is in decrement mode.
This is because x >=0 and x < interval after leaving the while-loop.

Signed-off-by: Johannes Schlatow <schlatow@ida.ing.tu-bs.de>
Message-id: 20150630135821.51f3b4fd@johanness-latitude
Reviewed-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2015-07-06 10:05:44 +01:00

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/*
* Xilinx Zynq cadence TTC model
*
* Copyright (c) 2011 Xilinx Inc.
* Copyright (c) 2012 Peter A.G. Crosthwaite (peter.crosthwaite@petalogix.com)
* Copyright (c) 2012 PetaLogix Pty Ltd.
* Written By Haibing Ma
* M. Habib
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "hw/sysbus.h"
#include "qemu/timer.h"
#ifdef CADENCE_TTC_ERR_DEBUG
#define DB_PRINT(...) do { \
fprintf(stderr, ": %s: ", __func__); \
fprintf(stderr, ## __VA_ARGS__); \
} while (0);
#else
#define DB_PRINT(...)
#endif
#define COUNTER_INTR_IV 0x00000001
#define COUNTER_INTR_M1 0x00000002
#define COUNTER_INTR_M2 0x00000004
#define COUNTER_INTR_M3 0x00000008
#define COUNTER_INTR_OV 0x00000010
#define COUNTER_INTR_EV 0x00000020
#define COUNTER_CTRL_DIS 0x00000001
#define COUNTER_CTRL_INT 0x00000002
#define COUNTER_CTRL_DEC 0x00000004
#define COUNTER_CTRL_MATCH 0x00000008
#define COUNTER_CTRL_RST 0x00000010
#define CLOCK_CTRL_PS_EN 0x00000001
#define CLOCK_CTRL_PS_V 0x0000001e
typedef struct {
QEMUTimer *timer;
int freq;
uint32_t reg_clock;
uint32_t reg_count;
uint32_t reg_value;
uint16_t reg_interval;
uint16_t reg_match[3];
uint32_t reg_intr;
uint32_t reg_intr_en;
uint32_t reg_event_ctrl;
uint32_t reg_event;
uint64_t cpu_time;
unsigned int cpu_time_valid;
qemu_irq irq;
} CadenceTimerState;
#define TYPE_CADENCE_TTC "cadence_ttc"
#define CADENCE_TTC(obj) \
OBJECT_CHECK(CadenceTTCState, (obj), TYPE_CADENCE_TTC)
typedef struct CadenceTTCState {
SysBusDevice parent_obj;
MemoryRegion iomem;
CadenceTimerState timer[3];
} CadenceTTCState;
static void cadence_timer_update(CadenceTimerState *s)
{
qemu_set_irq(s->irq, !!(s->reg_intr & s->reg_intr_en));
}
static CadenceTimerState *cadence_timer_from_addr(void *opaque,
hwaddr offset)
{
unsigned int index;
CadenceTTCState *s = (CadenceTTCState *)opaque;
index = (offset >> 2) % 3;
return &s->timer[index];
}
static uint64_t cadence_timer_get_ns(CadenceTimerState *s, uint64_t timer_steps)
{
/* timer_steps has max value of 0x100000000. double check it
* (or overflow can happen below) */
assert(timer_steps <= 1ULL << 32);
uint64_t r = timer_steps * 1000000000ULL;
if (s->reg_clock & CLOCK_CTRL_PS_EN) {
r >>= 16 - (((s->reg_clock & CLOCK_CTRL_PS_V) >> 1) + 1);
} else {
r >>= 16;
}
r /= (uint64_t)s->freq;
return r;
}
static uint64_t cadence_timer_get_steps(CadenceTimerState *s, uint64_t ns)
{
uint64_t to_divide = 1000000000ULL;
uint64_t r = ns;
/* for very large intervals (> 8s) do some division first to stop
* overflow (costs some prescision) */
while (r >= 8ULL << 30 && to_divide > 1) {
r /= 1000;
to_divide /= 1000;
}
r <<= 16;
/* keep early-dividing as needed */
while (r >= 8ULL << 30 && to_divide > 1) {
r /= 1000;
to_divide /= 1000;
}
r *= (uint64_t)s->freq;
if (s->reg_clock & CLOCK_CTRL_PS_EN) {
r /= 1 << (((s->reg_clock & CLOCK_CTRL_PS_V) >> 1) + 1);
}
r /= to_divide;
return r;
}
/* determine if x is in between a and b, exclusive of a, inclusive of b */
static inline int64_t is_between(int64_t x, int64_t a, int64_t b)
{
if (a < b) {
return x > a && x <= b;
}
return x < a && x >= b;
}
static void cadence_timer_run(CadenceTimerState *s)
{
int i;
int64_t event_interval, next_value;
assert(s->cpu_time_valid); /* cadence_timer_sync must be called first */
if (s->reg_count & COUNTER_CTRL_DIS) {
s->cpu_time_valid = 0;
return;
}
{ /* figure out what's going to happen next (rollover or match) */
int64_t interval = (uint64_t)((s->reg_count & COUNTER_CTRL_INT) ?
(int64_t)s->reg_interval + 1 : 0x10000ULL) << 16;
next_value = (s->reg_count & COUNTER_CTRL_DEC) ? -1ULL : interval;
for (i = 0; i < 3; ++i) {
int64_t cand = (uint64_t)s->reg_match[i] << 16;
if (is_between(cand, (uint64_t)s->reg_value, next_value)) {
next_value = cand;
}
}
}
DB_PRINT("next timer event value: %09llx\n",
(unsigned long long)next_value);
event_interval = next_value - (int64_t)s->reg_value;
event_interval = (event_interval < 0) ? -event_interval : event_interval;
timer_mod(s->timer, s->cpu_time +
cadence_timer_get_ns(s, event_interval));
}
static void cadence_timer_sync(CadenceTimerState *s)
{
int i;
int64_t r, x;
int64_t interval = ((s->reg_count & COUNTER_CTRL_INT) ?
(int64_t)s->reg_interval + 1 : 0x10000ULL) << 16;
uint64_t old_time = s->cpu_time;
s->cpu_time = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
DB_PRINT("cpu time: %lld ns\n", (long long)old_time);
if (!s->cpu_time_valid || old_time == s->cpu_time) {
s->cpu_time_valid = 1;
return;
}
r = (int64_t)cadence_timer_get_steps(s, s->cpu_time - old_time);
x = (int64_t)s->reg_value + ((s->reg_count & COUNTER_CTRL_DEC) ? -r : r);
for (i = 0; i < 3; ++i) {
int64_t m = (int64_t)s->reg_match[i] << 16;
if (m > interval) {
continue;
}
/* check to see if match event has occurred. check m +/- interval
* to account for match events in wrap around cases */
if (is_between(m, s->reg_value, x) ||
is_between(m + interval, s->reg_value, x) ||
is_between(m - interval, s->reg_value, x)) {
s->reg_intr |= (2 << i);
}
}
if ((x < 0) || (x >= interval)) {
s->reg_intr |= (s->reg_count & COUNTER_CTRL_INT) ?
COUNTER_INTR_IV : COUNTER_INTR_OV;
}
while (x < 0) {
x += interval;
}
s->reg_value = (uint32_t)(x % interval);
cadence_timer_update(s);
}
static void cadence_timer_tick(void *opaque)
{
CadenceTimerState *s = opaque;
DB_PRINT("\n");
cadence_timer_sync(s);
cadence_timer_run(s);
}
static uint32_t cadence_ttc_read_imp(void *opaque, hwaddr offset)
{
CadenceTimerState *s = cadence_timer_from_addr(opaque, offset);
uint32_t value;
cadence_timer_sync(s);
cadence_timer_run(s);
switch (offset) {
case 0x00: /* clock control */
case 0x04:
case 0x08:
return s->reg_clock;
case 0x0c: /* counter control */
case 0x10:
case 0x14:
return s->reg_count;
case 0x18: /* counter value */
case 0x1c:
case 0x20:
return (uint16_t)(s->reg_value >> 16);
case 0x24: /* reg_interval counter */
case 0x28:
case 0x2c:
return s->reg_interval;
case 0x30: /* match 1 counter */
case 0x34:
case 0x38:
return s->reg_match[0];
case 0x3c: /* match 2 counter */
case 0x40:
case 0x44:
return s->reg_match[1];
case 0x48: /* match 3 counter */
case 0x4c:
case 0x50:
return s->reg_match[2];
case 0x54: /* interrupt register */
case 0x58:
case 0x5c:
/* cleared after read */
value = s->reg_intr;
s->reg_intr = 0;
cadence_timer_update(s);
return value;
case 0x60: /* interrupt enable */
case 0x64:
case 0x68:
return s->reg_intr_en;
case 0x6c:
case 0x70:
case 0x74:
return s->reg_event_ctrl;
case 0x78:
case 0x7c:
case 0x80:
return s->reg_event;
default:
return 0;
}
}
static uint64_t cadence_ttc_read(void *opaque, hwaddr offset,
unsigned size)
{
uint32_t ret = cadence_ttc_read_imp(opaque, offset);
DB_PRINT("addr: %08x data: %08x\n", (unsigned)offset, (unsigned)ret);
return ret;
}
static void cadence_ttc_write(void *opaque, hwaddr offset,
uint64_t value, unsigned size)
{
CadenceTimerState *s = cadence_timer_from_addr(opaque, offset);
DB_PRINT("addr: %08x data %08x\n", (unsigned)offset, (unsigned)value);
cadence_timer_sync(s);
switch (offset) {
case 0x00: /* clock control */
case 0x04:
case 0x08:
s->reg_clock = value & 0x3F;
break;
case 0x0c: /* counter control */
case 0x10:
case 0x14:
if (value & COUNTER_CTRL_RST) {
s->reg_value = 0;
}
s->reg_count = value & 0x3f & ~COUNTER_CTRL_RST;
break;
case 0x24: /* interval register */
case 0x28:
case 0x2c:
s->reg_interval = value & 0xffff;
break;
case 0x30: /* match register */
case 0x34:
case 0x38:
s->reg_match[0] = value & 0xffff;
break;
case 0x3c: /* match register */
case 0x40:
case 0x44:
s->reg_match[1] = value & 0xffff;
break;
case 0x48: /* match register */
case 0x4c:
case 0x50:
s->reg_match[2] = value & 0xffff;
break;
case 0x54: /* interrupt register */
case 0x58:
case 0x5c:
break;
case 0x60: /* interrupt enable */
case 0x64:
case 0x68:
s->reg_intr_en = value & 0x3f;
break;
case 0x6c: /* event control */
case 0x70:
case 0x74:
s->reg_event_ctrl = value & 0x07;
break;
default:
return;
}
cadence_timer_run(s);
cadence_timer_update(s);
}
static const MemoryRegionOps cadence_ttc_ops = {
.read = cadence_ttc_read,
.write = cadence_ttc_write,
.endianness = DEVICE_NATIVE_ENDIAN,
};
static void cadence_timer_reset(CadenceTimerState *s)
{
s->reg_count = 0x21;
}
static void cadence_timer_init(uint32_t freq, CadenceTimerState *s)
{
memset(s, 0, sizeof(CadenceTimerState));
s->freq = freq;
cadence_timer_reset(s);
s->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, cadence_timer_tick, s);
}
static void cadence_ttc_init(Object *obj)
{
CadenceTTCState *s = CADENCE_TTC(obj);
int i;
for (i = 0; i < 3; ++i) {
cadence_timer_init(133000000, &s->timer[i]);
sysbus_init_irq(SYS_BUS_DEVICE(obj), &s->timer[i].irq);
}
memory_region_init_io(&s->iomem, obj, &cadence_ttc_ops, s,
"timer", 0x1000);
sysbus_init_mmio(SYS_BUS_DEVICE(obj), &s->iomem);
}
static void cadence_timer_pre_save(void *opaque)
{
cadence_timer_sync((CadenceTimerState *)opaque);
}
static int cadence_timer_post_load(void *opaque, int version_id)
{
CadenceTimerState *s = opaque;
s->cpu_time_valid = 0;
cadence_timer_sync(s);
cadence_timer_run(s);
cadence_timer_update(s);
return 0;
}
static const VMStateDescription vmstate_cadence_timer = {
.name = "cadence_timer",
.version_id = 1,
.minimum_version_id = 1,
.pre_save = cadence_timer_pre_save,
.post_load = cadence_timer_post_load,
.fields = (VMStateField[]) {
VMSTATE_UINT32(reg_clock, CadenceTimerState),
VMSTATE_UINT32(reg_count, CadenceTimerState),
VMSTATE_UINT32(reg_value, CadenceTimerState),
VMSTATE_UINT16(reg_interval, CadenceTimerState),
VMSTATE_UINT16_ARRAY(reg_match, CadenceTimerState, 3),
VMSTATE_UINT32(reg_intr, CadenceTimerState),
VMSTATE_UINT32(reg_intr_en, CadenceTimerState),
VMSTATE_UINT32(reg_event_ctrl, CadenceTimerState),
VMSTATE_UINT32(reg_event, CadenceTimerState),
VMSTATE_END_OF_LIST()
}
};
static const VMStateDescription vmstate_cadence_ttc = {
.name = "cadence_TTC",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_STRUCT_ARRAY(timer, CadenceTTCState, 3, 0,
vmstate_cadence_timer,
CadenceTimerState),
VMSTATE_END_OF_LIST()
}
};
static void cadence_ttc_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->vmsd = &vmstate_cadence_ttc;
}
static const TypeInfo cadence_ttc_info = {
.name = TYPE_CADENCE_TTC,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(CadenceTTCState),
.instance_init = cadence_ttc_init,
.class_init = cadence_ttc_class_init,
};
static void cadence_ttc_register_types(void)
{
type_register_static(&cadence_ttc_info);
}
type_init(cadence_ttc_register_types)
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