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-rw-r--r--hw/timer/xilinx_timer.c255
1 files changed, 255 insertions, 0 deletions
diff --git a/hw/timer/xilinx_timer.c b/hw/timer/xilinx_timer.c
new file mode 100644
index 0000000000..0c39cff089
--- /dev/null
+++ b/hw/timer/xilinx_timer.c
@@ -0,0 +1,255 @@
+/*
+ * QEMU model of the Xilinx timer block.
+ *
+ * Copyright (c) 2009 Edgar E. Iglesias.
+ *
+ * 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 "hw/sysbus.h"
+#include "hw/ptimer.h"
+#include "qemu/log.h"
+
+#define D(x)
+
+#define R_TCSR 0
+#define R_TLR 1
+#define R_TCR 2
+#define R_MAX 4
+
+#define TCSR_MDT (1<<0)
+#define TCSR_UDT (1<<1)
+#define TCSR_GENT (1<<2)
+#define TCSR_CAPT (1<<3)
+#define TCSR_ARHT (1<<4)
+#define TCSR_LOAD (1<<5)
+#define TCSR_ENIT (1<<6)
+#define TCSR_ENT (1<<7)
+#define TCSR_TINT (1<<8)
+#define TCSR_PWMA (1<<9)
+#define TCSR_ENALL (1<<10)
+
+struct xlx_timer
+{
+ QEMUBH *bh;
+ ptimer_state *ptimer;
+ void *parent;
+ int nr; /* for debug. */
+
+ unsigned long timer_div;
+
+ uint32_t regs[R_MAX];
+};
+
+struct timerblock
+{
+ SysBusDevice busdev;
+ MemoryRegion mmio;
+ qemu_irq irq;
+ uint8_t one_timer_only;
+ uint32_t freq_hz;
+ struct xlx_timer *timers;
+};
+
+static inline unsigned int num_timers(struct timerblock *t)
+{
+ return 2 - t->one_timer_only;
+}
+
+static inline unsigned int timer_from_addr(hwaddr addr)
+{
+ /* Timers get a 4x32bit control reg area each. */
+ return addr >> 2;
+}
+
+static void timer_update_irq(struct timerblock *t)
+{
+ unsigned int i, irq = 0;
+ uint32_t csr;
+
+ for (i = 0; i < num_timers(t); i++) {
+ csr = t->timers[i].regs[R_TCSR];
+ irq |= (csr & TCSR_TINT) && (csr & TCSR_ENIT);
+ }
+
+ /* All timers within the same slave share a single IRQ line. */
+ qemu_set_irq(t->irq, !!irq);
+}
+
+static uint64_t
+timer_read(void *opaque, hwaddr addr, unsigned int size)
+{
+ struct timerblock *t = opaque;
+ struct xlx_timer *xt;
+ uint32_t r = 0;
+ unsigned int timer;
+
+ addr >>= 2;
+ timer = timer_from_addr(addr);
+ xt = &t->timers[timer];
+ /* Further decoding to address a specific timers reg. */
+ addr &= 0x3;
+ switch (addr)
+ {
+ case R_TCR:
+ r = ptimer_get_count(xt->ptimer);
+ if (!(xt->regs[R_TCSR] & TCSR_UDT))
+ r = ~r;
+ D(qemu_log("xlx_timer t=%d read counter=%x udt=%d\n",
+ timer, r, xt->regs[R_TCSR] & TCSR_UDT));
+ break;
+ default:
+ if (addr < ARRAY_SIZE(xt->regs))
+ r = xt->regs[addr];
+ break;
+
+ }
+ D(fprintf(stderr, "%s timer=%d %x=%x\n", __func__, timer, addr * 4, r));
+ return r;
+}
+
+static void timer_enable(struct xlx_timer *xt)
+{
+ uint64_t count;
+
+ D(fprintf(stderr, "%s timer=%d down=%d\n", __func__,
+ xt->nr, xt->regs[R_TCSR] & TCSR_UDT));
+
+ ptimer_stop(xt->ptimer);
+
+ if (xt->regs[R_TCSR] & TCSR_UDT)
+ count = xt->regs[R_TLR];
+ else
+ count = ~0 - xt->regs[R_TLR];
+ ptimer_set_limit(xt->ptimer, count, 1);
+ ptimer_run(xt->ptimer, 1);
+}
+
+static void
+timer_write(void *opaque, hwaddr addr,
+ uint64_t val64, unsigned int size)
+{
+ struct timerblock *t = opaque;
+ struct xlx_timer *xt;
+ unsigned int timer;
+ uint32_t value = val64;
+
+ addr >>= 2;
+ timer = timer_from_addr(addr);
+ xt = &t->timers[timer];
+ D(fprintf(stderr, "%s addr=%x val=%x (timer=%d off=%d)\n",
+ __func__, addr * 4, value, timer, addr & 3));
+ /* Further decoding to address a specific timers reg. */
+ addr &= 3;
+ switch (addr)
+ {
+ case R_TCSR:
+ if (value & TCSR_TINT)
+ value &= ~TCSR_TINT;
+
+ xt->regs[addr] = value;
+ if (value & TCSR_ENT)
+ timer_enable(xt);
+ break;
+
+ default:
+ if (addr < ARRAY_SIZE(xt->regs))
+ xt->regs[addr] = value;
+ break;
+ }
+ timer_update_irq(t);
+}
+
+static const MemoryRegionOps timer_ops = {
+ .read = timer_read,
+ .write = timer_write,
+ .endianness = DEVICE_NATIVE_ENDIAN,
+ .valid = {
+ .min_access_size = 4,
+ .max_access_size = 4
+ }
+};
+
+static void timer_hit(void *opaque)
+{
+ struct xlx_timer *xt = opaque;
+ struct timerblock *t = xt->parent;
+ D(fprintf(stderr, "%s %d\n", __func__, xt->nr));
+ xt->regs[R_TCSR] |= TCSR_TINT;
+
+ if (xt->regs[R_TCSR] & TCSR_ARHT)
+ timer_enable(xt);
+ timer_update_irq(t);
+}
+
+static int xilinx_timer_init(SysBusDevice *dev)
+{
+ struct timerblock *t = FROM_SYSBUS(typeof (*t), dev);
+ unsigned int i;
+
+ /* All timers share a single irq line. */
+ sysbus_init_irq(dev, &t->irq);
+
+ /* Init all the ptimers. */
+ t->timers = g_malloc0(sizeof t->timers[0] * num_timers(t));
+ for (i = 0; i < num_timers(t); i++) {
+ struct xlx_timer *xt = &t->timers[i];
+
+ xt->parent = t;
+ xt->nr = i;
+ xt->bh = qemu_bh_new(timer_hit, xt);
+ xt->ptimer = ptimer_init(xt->bh);
+ ptimer_set_freq(xt->ptimer, t->freq_hz);
+ }
+
+ memory_region_init_io(&t->mmio, &timer_ops, t, "xlnx.xps-timer",
+ R_MAX * 4 * num_timers(t));
+ sysbus_init_mmio(dev, &t->mmio);
+ return 0;
+}
+
+static Property xilinx_timer_properties[] = {
+ DEFINE_PROP_UINT32("clock-frequency", struct timerblock, freq_hz,
+ 62 * 1000000),
+ DEFINE_PROP_UINT8("one-timer-only", struct timerblock, one_timer_only, 0),
+ DEFINE_PROP_END_OF_LIST(),
+};
+
+static void xilinx_timer_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+ SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
+
+ k->init = xilinx_timer_init;
+ dc->props = xilinx_timer_properties;
+}
+
+static const TypeInfo xilinx_timer_info = {
+ .name = "xlnx.xps-timer",
+ .parent = TYPE_SYS_BUS_DEVICE,
+ .instance_size = sizeof(struct timerblock),
+ .class_init = xilinx_timer_class_init,
+};
+
+static void xilinx_timer_register_types(void)
+{
+ type_register_static(&xilinx_timer_info);
+}
+
+type_init(xilinx_timer_register_types)
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-25 06:40:41 +0000