* QEMU Sparc SLAVIO timer controller emulation
*
* Copyright (c) 2003-2005 Fabrice Bellard
- *
+ *
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
-#include "vl.h"
-
-//#define DEBUG_TIMER
-#ifdef DEBUG_TIMER
-#define DPRINTF(fmt, args...) \
-do { printf("TIMER: " fmt , ##args); } while (0)
-#else
-#define DPRINTF(fmt, args...)
-#endif
+#include "sun4m.h"
+#include "qemu-timer.h"
+#include "sysbus.h"
+#include "trace.h"
/*
* Registers of hardware timer in sun4m.
* This is the timer/counter part of chip STP2001 (Slave I/O), also
* produced as NCR89C105. See
* http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/NCR89C105.txt
- *
+ *
* The 31-bit counter is incremented every 500ns by bit 9. Bits 8..0
* are zero. Bit 31 is 1 when count has been reached.
*
+ * Per-CPU timers interrupt local CPU, system timer uses normal
+ * interrupt routing.
+ *
*/
+#define MAX_CPUS 16
+
+typedef struct CPUTimerState {
+ qemu_irq irq;
+ ptimer_state *timer;
+ uint32_t count, counthigh, reached;
+ uint64_t limit;
+ // processor only
+ uint32_t running;
+} CPUTimerState;
+
typedef struct SLAVIO_TIMERState {
- uint32_t limit, count, counthigh;
- int64_t count_load_time;
- int64_t expire_time;
- int64_t stop_time, tick_offset;
- QEMUTimer *irq_timer;
- int irq;
- int reached, stopped;
- int mode; // 0 = processor, 1 = user, 2 = system
+ SysBusDevice busdev;
+ uint32_t num_cpus;
+ CPUTimerState cputimer[MAX_CPUS + 1];
+ uint32_t cputimer_mode;
} SLAVIO_TIMERState;
-#define TIMER_MAXADDR 0x1f
-#define CNT_FREQ 2000000
-#define MAX_CPUS 16
+typedef struct TimerContext {
+ SLAVIO_TIMERState *s;
+ unsigned int timer_index; /* 0 for system, 1 ... MAX_CPUS for CPU timers */
+} TimerContext;
+
+#define SYS_TIMER_SIZE 0x14
+#define CPU_TIMER_SIZE 0x10
+
+#define TIMER_LIMIT 0
+#define TIMER_COUNTER 1
+#define TIMER_COUNTER_NORST 2
+#define TIMER_STATUS 3
+#define TIMER_MODE 4
+
+#define TIMER_COUNT_MASK32 0xfffffe00
+#define TIMER_LIMIT_MASK32 0x7fffffff
+#define TIMER_MAX_COUNT64 0x7ffffffffffffe00ULL
+#define TIMER_MAX_COUNT32 0x7ffffe00ULL
+#define TIMER_REACHED 0x80000000
+#define TIMER_PERIOD 500ULL // 500ns
+#define LIMIT_TO_PERIODS(l) (((l) >> 9) - 1)
+#define PERIODS_TO_LIMIT(l) (((l) + 1) << 9)
+
+static int slavio_timer_is_user(TimerContext *tc)
+{
+ SLAVIO_TIMERState *s = tc->s;
+ unsigned int timer_index = tc->timer_index;
+
+ return timer_index != 0 && (s->cputimer_mode & (1 << (timer_index - 1)));
+}
// Update count, set irq, update expire_time
-static void slavio_timer_get_out(SLAVIO_TIMERState *s)
+// Convert from ptimer countdown units
+static void slavio_timer_get_out(CPUTimerState *t)
{
- int out;
- int64_t diff, ticks, count;
- uint32_t limit;
-
- // There are three clock tick units: CPU ticks, register units
- // (nanoseconds), and counter ticks (500 ns).
- if (s->mode == 1 && s->stopped)
- ticks = s->stop_time;
- else
- ticks = qemu_get_clock(vm_clock) - s->tick_offset;
-
- out = (ticks >= s->expire_time);
- if (out)
- s->reached = 0x80000000;
- if (!s->limit)
- limit = 0x7fffffff;
- else
- limit = s->limit;
-
- // Convert register units to counter ticks
- limit = limit >> 9;
-
- // Convert cpu ticks to counter ticks
- diff = muldiv64(ticks - s->count_load_time, CNT_FREQ, ticks_per_sec);
-
- // Calculate what the counter should be, convert to register
- // units
- count = diff % limit;
- s->count = count << 9;
- s->counthigh = count >> 22;
-
- // Expire time: CPU ticks left to next interrupt
- // Convert remaining counter ticks to CPU ticks
- s->expire_time = ticks + muldiv64(limit - count, ticks_per_sec, CNT_FREQ);
-
- DPRINTF("irq %d limit %d reached %d d %lld count %d s->c %x diff %lld stopped %d mode %d\n", s->irq, limit, s->reached?1:0, (ticks-s->count_load_time), count, s->count, s->expire_time - ticks, s->stopped, s->mode);
-
- if (s->mode != 1)
- pic_set_irq(s->irq, out);
+ uint64_t count, limit;
+
+ if (t->limit == 0) { /* free-run system or processor counter */
+ limit = TIMER_MAX_COUNT32;
+ } else {
+ limit = t->limit;
+ }
+ count = limit - PERIODS_TO_LIMIT(ptimer_get_count(t->timer));
+
+ trace_slavio_timer_get_out(t->limit, t->counthigh, t->count);
+ t->count = count & TIMER_COUNT_MASK32;
+ t->counthigh = count >> 32;
}
// timer callback
static void slavio_timer_irq(void *opaque)
{
- SLAVIO_TIMERState *s = opaque;
-
- if (!s->irq_timer)
- return;
- slavio_timer_get_out(s);
- if (s->mode != 1)
- qemu_mod_timer(s->irq_timer, s->expire_time);
+ TimerContext *tc = opaque;
+ SLAVIO_TIMERState *s = tc->s;
+ CPUTimerState *t = &s->cputimer[tc->timer_index];
+
+ slavio_timer_get_out(t);
+ trace_slavio_timer_irq(t->counthigh, t->count);
+ /* if limit is 0 (free-run), there will be no match */
+ if (t->limit != 0) {
+ t->reached = TIMER_REACHED;
+ }
+ /* there is no interrupt if user timer or free-run */
+ if (!slavio_timer_is_user(tc) && t->limit != 0) {
+ qemu_irq_raise(t->irq);
+ }
}
static uint32_t slavio_timer_mem_readl(void *opaque, target_phys_addr_t addr)
{
- SLAVIO_TIMERState *s = opaque;
- uint32_t saddr;
+ TimerContext *tc = opaque;
+ SLAVIO_TIMERState *s = tc->s;
+ uint32_t saddr, ret;
+ unsigned int timer_index = tc->timer_index;
+ CPUTimerState *t = &s->cputimer[timer_index];
- saddr = (addr & TIMER_MAXADDR) >> 2;
+ saddr = addr >> 2;
switch (saddr) {
- case 0:
- // read limit (system counter mode) or read most signifying
- // part of counter (user mode)
- if (s->mode != 1) {
- // clear irq
- pic_set_irq(s->irq, 0);
- s->count_load_time = qemu_get_clock(vm_clock);
- s->reached = 0;
- return s->limit;
- }
- else {
- slavio_timer_get_out(s);
- return s->counthigh & 0x7fffffff;
- }
- case 1:
- // read counter and reached bit (system mode) or read lsbits
- // of counter (user mode)
- slavio_timer_get_out(s);
- if (s->mode != 1)
- return (s->count & 0x7fffffff) | s->reached;
- else
- return s->count;
- case 3:
- // read start/stop status
- return s->stopped;
- case 4:
- // read user/system mode
- return s->mode & 1;
+ case TIMER_LIMIT:
+ // read limit (system counter mode) or read most signifying
+ // part of counter (user mode)
+ if (slavio_timer_is_user(tc)) {
+ // read user timer MSW
+ slavio_timer_get_out(t);
+ ret = t->counthigh | t->reached;
+ } else {
+ // read limit
+ // clear irq
+ qemu_irq_lower(t->irq);
+ t->reached = 0;
+ ret = t->limit & TIMER_LIMIT_MASK32;
+ }
+ break;
+ case TIMER_COUNTER:
+ // read counter and reached bit (system mode) or read lsbits
+ // of counter (user mode)
+ slavio_timer_get_out(t);
+ if (slavio_timer_is_user(tc)) { // read user timer LSW
+ ret = t->count & TIMER_MAX_COUNT64;
+ } else { // read limit
+ ret = (t->count & TIMER_MAX_COUNT32) |
+ t->reached;
+ }
+ break;
+ case TIMER_STATUS:
+ // only available in processor counter/timer
+ // read start/stop status
+ if (timer_index > 0) {
+ ret = t->running;
+ } else {
+ ret = 0;
+ }
+ break;
+ case TIMER_MODE:
+ // only available in system counter
+ // read user/system mode
+ ret = s->cputimer_mode;
+ break;
default:
- return 0;
+ trace_slavio_timer_mem_readl_invalid(addr);
+ ret = 0;
+ break;
}
+ trace_slavio_timer_mem_readl(addr, ret);
+ return ret;
}
-static void slavio_timer_mem_writel(void *opaque, target_phys_addr_t addr, uint32_t val)
+static void slavio_timer_mem_writel(void *opaque, target_phys_addr_t addr,
+ uint32_t val)
{
- SLAVIO_TIMERState *s = opaque;
+ TimerContext *tc = opaque;
+ SLAVIO_TIMERState *s = tc->s;
uint32_t saddr;
+ unsigned int timer_index = tc->timer_index;
+ CPUTimerState *t = &s->cputimer[timer_index];
- saddr = (addr & TIMER_MAXADDR) >> 2;
+ trace_slavio_timer_mem_writel(addr, val);
+ saddr = addr >> 2;
switch (saddr) {
- case 0:
- // set limit, reset counter
- s->count_load_time = qemu_get_clock(vm_clock);
- // fall through
- case 2:
- // set limit without resetting counter
- if (!val)
- s->limit = 0x7fffffff;
- else
- s->limit = val & 0x7fffffff;
- slavio_timer_irq(s);
- break;
- case 3:
- // start/stop user counter
- if (s->mode == 1) {
- if (val & 1) {
- s->stop_time = qemu_get_clock(vm_clock);
- s->stopped = 1;
- }
- else {
- if (s->stopped)
- s->tick_offset += qemu_get_clock(vm_clock) - s->stop_time;
- s->stopped = 0;
- }
- }
- break;
- case 4:
- // bit 0: user (1) or system (0) counter mode
- if (s->mode == 0 || s->mode == 1)
- s->mode = val & 1;
- break;
+ case TIMER_LIMIT:
+ if (slavio_timer_is_user(tc)) {
+ uint64_t count;
+
+ // set user counter MSW, reset counter
+ t->limit = TIMER_MAX_COUNT64;
+ t->counthigh = val & (TIMER_MAX_COUNT64 >> 32);
+ t->reached = 0;
+ count = ((uint64_t)t->counthigh << 32) | t->count;
+ trace_slavio_timer_mem_writel_limit(timer_index, count);
+ ptimer_set_count(t->timer, LIMIT_TO_PERIODS(t->limit - count));
+ } else {
+ // set limit, reset counter
+ qemu_irq_lower(t->irq);
+ t->limit = val & TIMER_MAX_COUNT32;
+ if (t->timer) {
+ if (t->limit == 0) { /* free-run */
+ ptimer_set_limit(t->timer,
+ LIMIT_TO_PERIODS(TIMER_MAX_COUNT32), 1);
+ } else {
+ ptimer_set_limit(t->timer, LIMIT_TO_PERIODS(t->limit), 1);
+ }
+ }
+ }
+ break;
+ case TIMER_COUNTER:
+ if (slavio_timer_is_user(tc)) {
+ uint64_t count;
+
+ // set user counter LSW, reset counter
+ t->limit = TIMER_MAX_COUNT64;
+ t->count = val & TIMER_MAX_COUNT64;
+ t->reached = 0;
+ count = ((uint64_t)t->counthigh) << 32 | t->count;
+ trace_slavio_timer_mem_writel_limit(timer_index, count);
+ ptimer_set_count(t->timer, LIMIT_TO_PERIODS(t->limit - count));
+ } else {
+ trace_slavio_timer_mem_writel_counter_invalid();
+ }
+ break;
+ case TIMER_COUNTER_NORST:
+ // set limit without resetting counter
+ t->limit = val & TIMER_MAX_COUNT32;
+ if (t->limit == 0) { /* free-run */
+ ptimer_set_limit(t->timer, LIMIT_TO_PERIODS(TIMER_MAX_COUNT32), 0);
+ } else {
+ ptimer_set_limit(t->timer, LIMIT_TO_PERIODS(t->limit), 0);
+ }
+ break;
+ case TIMER_STATUS:
+ if (slavio_timer_is_user(tc)) {
+ // start/stop user counter
+ if ((val & 1) && !t->running) {
+ trace_slavio_timer_mem_writel_status_start(timer_index);
+ ptimer_run(t->timer, 0);
+ t->running = 1;
+ } else if (!(val & 1) && t->running) {
+ trace_slavio_timer_mem_writel_status_stop(timer_index);
+ ptimer_stop(t->timer);
+ t->running = 0;
+ }
+ }
+ break;
+ case TIMER_MODE:
+ if (timer_index == 0) {
+ unsigned int i;
+
+ for (i = 0; i < s->num_cpus; i++) {
+ unsigned int processor = 1 << i;
+ CPUTimerState *curr_timer = &s->cputimer[i + 1];
+
+ // check for a change in timer mode for this processor
+ if ((val & processor) != (s->cputimer_mode & processor)) {
+ if (val & processor) { // counter -> user timer
+ qemu_irq_lower(curr_timer->irq);
+ // counters are always running
+ ptimer_stop(curr_timer->timer);
+ curr_timer->running = 0;
+ // user timer limit is always the same
+ curr_timer->limit = TIMER_MAX_COUNT64;
+ ptimer_set_limit(curr_timer->timer,
+ LIMIT_TO_PERIODS(curr_timer->limit),
+ 1);
+ // set this processors user timer bit in config
+ // register
+ s->cputimer_mode |= processor;
+ trace_slavio_timer_mem_writel_mode_user(timer_index);
+ } else { // user timer -> counter
+ // stop the user timer if it is running
+ if (curr_timer->running) {
+ ptimer_stop(curr_timer->timer);
+ }
+ // start the counter
+ ptimer_run(curr_timer->timer, 0);
+ curr_timer->running = 1;
+ // clear this processors user timer bit in config
+ // register
+ s->cputimer_mode &= ~processor;
+ trace_slavio_timer_mem_writel_mode_counter(timer_index);
+ }
+ }
+ }
+ } else {
+ trace_slavio_timer_mem_writel_mode_invalid();
+ }
+ break;
default:
- break;
+ trace_slavio_timer_mem_writel_invalid(addr);
+ break;
}
}
-static CPUReadMemoryFunc *slavio_timer_mem_read[3] = {
- slavio_timer_mem_readl,
- slavio_timer_mem_readl,
+static CPUReadMemoryFunc * const slavio_timer_mem_read[3] = {
+ NULL,
+ NULL,
slavio_timer_mem_readl,
};
-static CPUWriteMemoryFunc *slavio_timer_mem_write[3] = {
- slavio_timer_mem_writel,
- slavio_timer_mem_writel,
+static CPUWriteMemoryFunc * const slavio_timer_mem_write[3] = {
+ NULL,
+ NULL,
slavio_timer_mem_writel,
};
-static void slavio_timer_save(QEMUFile *f, void *opaque)
-{
- SLAVIO_TIMERState *s = opaque;
-
- qemu_put_be32s(f, &s->limit);
- qemu_put_be32s(f, &s->count);
- qemu_put_be32s(f, &s->counthigh);
- qemu_put_be64s(f, &s->count_load_time);
- qemu_put_be64s(f, &s->expire_time);
- qemu_put_be64s(f, &s->stop_time);
- qemu_put_be64s(f, &s->tick_offset);
- qemu_put_be32s(f, &s->irq);
- qemu_put_be32s(f, &s->reached);
- qemu_put_be32s(f, &s->stopped);
- qemu_put_be32s(f, &s->mode);
-}
+static const VMStateDescription vmstate_timer = {
+ .name ="timer",
+ .version_id = 3,
+ .minimum_version_id = 3,
+ .minimum_version_id_old = 3,
+ .fields = (VMStateField []) {
+ VMSTATE_UINT64(limit, CPUTimerState),
+ VMSTATE_UINT32(count, CPUTimerState),
+ VMSTATE_UINT32(counthigh, CPUTimerState),
+ VMSTATE_UINT32(reached, CPUTimerState),
+ VMSTATE_UINT32(running, CPUTimerState),
+ VMSTATE_PTIMER(timer, CPUTimerState),
+ VMSTATE_END_OF_LIST()
+ }
+};
-static int slavio_timer_load(QEMUFile *f, void *opaque, int version_id)
-{
- SLAVIO_TIMERState *s = opaque;
-
- if (version_id != 1)
- return -EINVAL;
-
- qemu_get_be32s(f, &s->limit);
- qemu_get_be32s(f, &s->count);
- qemu_get_be32s(f, &s->counthigh);
- qemu_get_be64s(f, &s->count_load_time);
- qemu_get_be64s(f, &s->expire_time);
- qemu_get_be64s(f, &s->stop_time);
- qemu_get_be64s(f, &s->tick_offset);
- qemu_get_be32s(f, &s->irq);
- qemu_get_be32s(f, &s->reached);
- qemu_get_be32s(f, &s->stopped);
- qemu_get_be32s(f, &s->mode);
- return 0;
-}
+static const VMStateDescription vmstate_slavio_timer = {
+ .name ="slavio_timer",
+ .version_id = 3,
+ .minimum_version_id = 3,
+ .minimum_version_id_old = 3,
+ .fields = (VMStateField []) {
+ VMSTATE_STRUCT_ARRAY(cputimer, SLAVIO_TIMERState, MAX_CPUS + 1, 3,
+ vmstate_timer, CPUTimerState),
+ VMSTATE_END_OF_LIST()
+ }
+};
-static void slavio_timer_reset(void *opaque)
+static void slavio_timer_reset(DeviceState *d)
{
- SLAVIO_TIMERState *s = opaque;
-
- s->limit = 0;
- s->count = 0;
- s->count_load_time = qemu_get_clock(vm_clock);;
- s->stop_time = s->count_load_time;
- s->tick_offset = 0;
- s->reached = 0;
- s->mode &= 2;
- s->stopped = 1;
- slavio_timer_get_out(s);
+ SLAVIO_TIMERState *s = container_of(d, SLAVIO_TIMERState, busdev.qdev);
+ unsigned int i;
+ CPUTimerState *curr_timer;
+
+ for (i = 0; i <= MAX_CPUS; i++) {
+ curr_timer = &s->cputimer[i];
+ curr_timer->limit = 0;
+ curr_timer->count = 0;
+ curr_timer->reached = 0;
+ if (i <= s->num_cpus) {
+ ptimer_set_limit(curr_timer->timer,
+ LIMIT_TO_PERIODS(TIMER_MAX_COUNT32), 1);
+ ptimer_run(curr_timer->timer, 0);
+ curr_timer->running = 1;
+ }
+ }
+ s->cputimer_mode = 0;
}
-static void slavio_timer_init_internal(uint32_t addr, int irq, int mode)
+static int slavio_timer_init1(SysBusDevice *dev)
{
- int slavio_timer_io_memory;
- SLAVIO_TIMERState *s;
+ int io;
+ SLAVIO_TIMERState *s = FROM_SYSBUS(SLAVIO_TIMERState, dev);
+ QEMUBH *bh;
+ unsigned int i;
+ TimerContext *tc;
+
+ for (i = 0; i <= MAX_CPUS; i++) {
+ tc = qemu_mallocz(sizeof(TimerContext));
+ tc->s = s;
+ tc->timer_index = i;
+
+ bh = qemu_bh_new(slavio_timer_irq, tc);
+ s->cputimer[i].timer = ptimer_init(bh);
+ ptimer_set_period(s->cputimer[i].timer, TIMER_PERIOD);
+
+ io = cpu_register_io_memory(slavio_timer_mem_read,
+ slavio_timer_mem_write, tc,
+ DEVICE_NATIVE_ENDIAN);
+ if (i == 0) {
+ sysbus_init_mmio(dev, SYS_TIMER_SIZE, io);
+ } else {
+ sysbus_init_mmio(dev, CPU_TIMER_SIZE, io);
+ }
+
+ sysbus_init_irq(dev, &s->cputimer[i].irq);
+ }
- s = qemu_mallocz(sizeof(SLAVIO_TIMERState));
- if (!s)
- return;
- s->irq = irq;
- s->mode = mode;
- s->irq_timer = qemu_new_timer(vm_clock, slavio_timer_irq, s);
-
- slavio_timer_io_memory = cpu_register_io_memory(0, slavio_timer_mem_read,
- slavio_timer_mem_write, s);
- cpu_register_physical_memory(addr, TIMER_MAXADDR, slavio_timer_io_memory);
- register_savevm("slavio_timer", addr, 1, slavio_timer_save, slavio_timer_load, s);
- qemu_register_reset(slavio_timer_reset, s);
- slavio_timer_reset(s);
+ return 0;
}
-void slavio_timer_init(uint32_t addr1, int irq1, uint32_t addr2, int irq2)
-{
- int i;
-
- for (i = 0; i < MAX_CPUS; i++) {
- slavio_timer_init_internal(addr1 + i * TARGET_PAGE_SIZE, irq1, 0);
+static SysBusDeviceInfo slavio_timer_info = {
+ .init = slavio_timer_init1,
+ .qdev.name = "slavio_timer",
+ .qdev.size = sizeof(SLAVIO_TIMERState),
+ .qdev.vmsd = &vmstate_slavio_timer,
+ .qdev.reset = slavio_timer_reset,
+ .qdev.props = (Property[]) {
+ DEFINE_PROP_UINT32("num_cpus", SLAVIO_TIMERState, num_cpus, 0),
+ DEFINE_PROP_END_OF_LIST(),
}
+};
- slavio_timer_init_internal(addr2, irq2, 2);
+static void slavio_timer_register_devices(void)
+{
+ sysbus_register_withprop(&slavio_timer_info);
}
+
+device_init(slavio_timer_register_devices)
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