Signed-off-by: Fabien Chouteau<address@hidden>
---
hw/grlib_gptimer.c | 448 ++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 448 insertions(+), 0 deletions(-)
diff --git a/hw/grlib_gptimer.c b/hw/grlib_gptimer.c
new file mode 100644
index 0000000..41edbe4
--- /dev/null
+++ b/hw/grlib_gptimer.c
@@ -0,0 +1,448 @@
+/*
+ * QEMU GRLIB GPTimer Emulator
+ *
+ * Copyright (c) 2010 AdaCore
+ *
+ * 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
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "sysbus.h"
+#include "qemu-timer.h"
+
+#include "grlib.h"
+
+/* #define DEBUG_TIMER */
+
+#ifdef DEBUG_TIMER
+#define DPRINTF(fmt, ...) \
+ do { printf("GPTIMER: " fmt , ## __VA_ARGS__); } while (0)
+#else
+#define DPRINTF(fmt, ...)
+#endif
+
+#define UNIT_REG_SIZE 16 /* Size of memory mapped regs for the unit */
+#define GPTIMER_REG_SIZE 16 /* Size of memory mapped regs for a GPTimer */
+
+#define GPTIMER_MAX_TIMERS 8
+
+/* GPTimer Config register fields */
+#define GPTIMER_ENABLE (1<< 0)
+#define GPTIMER_RESTART (1<< 1)
+#define GPTIMER_LOAD (1<< 2)
+#define GPTIMER_INT_ENABLE (1<< 3)
+#define GPTIMER_INT_PENDING (1<< 4)
+#define GPTIMER_CHAIN (1<< 5) /* Not supported */
+#define GPTIMER_DEBUG_HALT (1<< 6) /* Not supported */
+
+/* Memory mapped register offsets */
+#define SCALER_OFFSET 0x00
+#define SCALER_RELOAD_OFFSET 0x04
+#define CONFIG_OFFSET 0x08
+#define COUNTER_OFFSET 0x00
+#define COUNTER_RELOAD_OFFSET 0x04
+#define TIMER_BASE 0x10
+
+typedef struct GPTimer GPTimer;
+typedef struct GPTimerUnit GPTimerUnit;
+
+struct GPTimer
+{
+ QEMUBH *bh;
+ struct ptimer_state *ptimer;
+
+ qemu_irq irq;
+ int id;
+ GPTimerUnit *unit;
+
+ /* registers */
+ uint32_t counter;
+ uint32_t reload;
+ uint32_t config;
+};
+
+struct GPTimerUnit
+{
+ SysBusDevice busdev;
+
+ uint32_t nr_timers; /* Number of timers available */
+ uint32_t freq_hz; /* System frequency */
+ uint32_t irq_line; /* Base irq line */
+
+ GPTimer *timers;
+
+ /* registers */
+ uint32_t scaler;
+ uint32_t reload;
+ uint32_t config;
+};
+
+DeviceState *grlib_gptimer_create(target_phys_addr_t base,
+ uint32_t nr_timers,
+ uint32_t freq,
+ qemu_irq *cpu_irqs,
+ int base_irq)
+{
+ DeviceState *dev;
+ int i;
+
+ dev = qdev_create(NULL, "grlib,gptimer");
+ qdev_prop_set_uint32(dev, "nr-timers", nr_timers);
+ qdev_prop_set_uint32(dev, "frequency", freq);
+ qdev_prop_set_uint32(dev, "irq-line", base_irq);
+
+ if (qdev_init(dev)) {
+ return NULL;
+ }
+
+ sysbus_mmio_map(sysbus_from_qdev(dev), 0, base);
+
+ for (i = 0; i< nr_timers; i++)
+ sysbus_connect_irq(sysbus_from_qdev(dev), i, cpu_irqs[base_irq + i]);
+
+ return dev;
+}
+
+static void grlib_gptimer_enable(GPTimer *timer)
+{
+ assert(timer != NULL);
+
+ DPRINTF("%s id:%d\n", __func__, timer->id);
+
+ ptimer_stop(timer->ptimer);
+
+ if (!(timer->config& GPTIMER_ENABLE)) {
+ /* Timer disabled */
+ DPRINTF("%s id:%d Timer disabled (config 0x%x)\n", __func__,
+ timer->id, timer->config);
+ return;
+ }
+
+ /* ptimer is triggered when the counter reach 0 but GPTimer is triggered at
+ underflow. Set count + 1 to simulate the GPTimer behavior. */
+
+ DPRINTF("%s id:%d set count 0x%x and run\n",
+ __func__,
+ timer->id,
+ timer->counter + 1);
+
+ ptimer_set_count(timer->ptimer, timer->counter + 1);
+ ptimer_run(timer->ptimer, 1);
+}
+
+static void grlib_gptimer_restart(GPTimer *timer)
+{
+ assert(timer != NULL);
+
+ DPRINTF("%s id:%d reload val: 0x%x\n", __func__, timer->id, timer->reload);
+
+ timer->counter = timer->reload;
+ grlib_gptimer_enable(timer);
+}
+
+static void grlib_gptimer_set_scaler(GPTimerUnit *unit, uint32_t scaler)
+{
+ int i = 0;
+ uint32_t value = 0;
+
+ assert(unit != NULL);
+
+
+ if (scaler> 0) {
+ value = unit->freq_hz / (scaler + 1);
+ } else {
+ value = unit->freq_hz;
+ }
+
+ DPRINTF("%s scaler:%d freq:0x%x\n", __func__, scaler, value);
+
+ for (i = 0; i< unit->nr_timers; i++) {
+ ptimer_set_freq(unit->timers[i].ptimer, value);
+ }
+}
+
+static void grlib_gptimer_hit(void *opaque)
+{
+ GPTimer *timer = opaque;
+ assert(timer != NULL);
+
+ DPRINTF("%s id:%d\n", __func__, timer->id);
+
+ /* Timer expired */
+
+ if (timer->config& GPTIMER_INT_ENABLE) {
+ /* Set the pending bit (only unset by write in the config register) */
+ timer->config&= GPTIMER_INT_PENDING;