Merge remote-tracking branch 'bonzini/hw-dirs' into staging

# By Paolo Bonzini
# Via Paolo Bonzini
* bonzini/hw-dirs: (35 commits)
  hw: move private headers to hw/ subdirectories.
  MAINTAINERS: update for source code movement
  hw: move last file to hw/arm/
  hw: move hw/kvm/ to hw/i386/kvm
  hw: move ARM CPU cores to hw/cpu/, configure with default-configs/
  hw: move other devices to hw/misc/, configure with default-configs/
  hw: move NVRAM interfaces to hw/nvram/, configure with default-configs/
  hw: move GPIO interfaces to hw/gpio/, configure with default-configs/
  hw: move interrupt controllers to hw/intc/, configure with default-configs/
  hw: move DMA controllers to hw/dma/, configure with default-configs/
  hw: move VFIO and ivshmem to hw/misc/
  hw: move PCI bridges to hw/pci-* or hw/ARCH
  hw: move SD/MMC devices to hw/sd/, configure with default-configs/
  hw: move timer devices to hw/timer/, configure with default-configs/
  hw: move ISA bridges and devices to hw/isa/, configure with default-configs/
  hw: move char devices to hw/char/, configure via default-configs/
  hw: move more files to hw/xen/
  hw: move SCSI controllers to hw/scsi/, configure via default-configs/
  hw: move SSI controllers to hw/ssi/, configure via default-configs/
  hw: move I2C controllers to hw/i2c/, configure via default-configs/
  ...

Message-id: 1365442249-18259-1-git-send-email-pbonzini@redhat.com
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

1 files changed, 265 insertions, 0 deletions

diff --git a/hw/timer/pl031.c b/hw/timer/pl031.c
new file mode 100644
index 0000000000..764940be7e
--- /dev/null
+++ b/hw/timer/pl031.c
@@ -0,0 +1,265 @@
+/*
+ * ARM AMBA PrimeCell PL031 RTC
+ *
+ * Copyright (c) 2007 CodeSourcery
+ *
+ * This file is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Contributions after 2012-01-13 are licensed under the terms of the
+ * GNU GPL, version 2 or (at your option) any later version.
+ */
+
+#include "hw/sysbus.h"
+#include "qemu/timer.h"
+#include "sysemu/sysemu.h"
+
+//#define DEBUG_PL031
+
+#ifdef DEBUG_PL031
+#define DPRINTF(fmt, ...) \
+do { printf("pl031: " fmt , ## __VA_ARGS__); } while (0)
+#else
+#define DPRINTF(fmt, ...) do {} while(0)
+#endif
+
+#define RTC_DR      0x00    /* Data read register */
+#define RTC_MR      0x04    /* Match register */
+#define RTC_LR      0x08    /* Data load register */
+#define RTC_CR      0x0c    /* Control register */
+#define RTC_IMSC    0x10    /* Interrupt mask and set register */
+#define RTC_RIS     0x14    /* Raw interrupt status register */
+#define RTC_MIS     0x18    /* Masked interrupt status register */
+#define RTC_ICR     0x1c    /* Interrupt clear register */
+
+typedef struct {
+    SysBusDevice busdev;
+    MemoryRegion iomem;
+    QEMUTimer *timer;
+    qemu_irq irq;
+
+    /* Needed to preserve the tick_count across migration, even if the
+     * absolute value of the rtc_clock is different on the source and
+     * destination.
+     */
+    uint32_t tick_offset_vmstate;
+    uint32_t tick_offset;
+
+    uint32_t mr;
+    uint32_t lr;
+    uint32_t cr;
+    uint32_t im;
+    uint32_t is;
+} pl031_state;
+
+static const unsigned char pl031_id[] = {
+    0x31, 0x10, 0x14, 0x00,         /* Device ID        */
+    0x0d, 0xf0, 0x05, 0xb1          /* Cell ID      */
+};
+
+static void pl031_update(pl031_state *s)
+{
+    qemu_set_irq(s->irq, s->is & s->im);
+}
+
+static void pl031_interrupt(void * opaque)
+{
+    pl031_state *s = (pl031_state *)opaque;
+
+    s->is = 1;
+    DPRINTF("Alarm raised\n");
+    pl031_update(s);
+}
+
+static uint32_t pl031_get_count(pl031_state *s)
+{
+    int64_t now = qemu_get_clock_ns(rtc_clock);
+    return s->tick_offset + now / get_ticks_per_sec();
+}
+
+static void pl031_set_alarm(pl031_state *s)
+{
+    uint32_t ticks;
+
+    /* The timer wraps around.  This subtraction also wraps in the same way,
+       and gives correct results when alarm < now_ticks.  */
+    ticks = s->mr - pl031_get_count(s);
+    DPRINTF("Alarm set in %ud ticks\n", ticks);
+    if (ticks == 0) {
+        qemu_del_timer(s->timer);
+        pl031_interrupt(s);
+    } else {
+        int64_t now = qemu_get_clock_ns(rtc_clock);
+        qemu_mod_timer(s->timer, now + (int64_t)ticks * get_ticks_per_sec());
+    }
+}
+
+static uint64_t pl031_read(void *opaque, hwaddr offset,
+                           unsigned size)
+{
+    pl031_state *s = (pl031_state *)opaque;
+
+    if (offset >= 0xfe0  &&  offset < 0x1000)
+        return pl031_id[(offset - 0xfe0) >> 2];
+
+    switch (offset) {
+    case RTC_DR:
+        return pl031_get_count(s);
+    case RTC_MR:
+        return s->mr;
+    case RTC_IMSC:
+        return s->im;
+    case RTC_RIS:
+        return s->is;
+    case RTC_LR:
+        return s->lr;
+    case RTC_CR:
+        /* RTC is permanently enabled.  */
+        return 1;
+    case RTC_MIS:
+        return s->is & s->im;
+    case RTC_ICR:
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "pl031: read of write-only register at offset 0x%x\n",
+                      (int)offset);
+        break;
+    default:
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "pl031_read: Bad offset 0x%x\n", (int)offset);
+        break;
+    }
+
+    return 0;
+}
+
+static void pl031_write(void * opaque, hwaddr offset,
+                        uint64_t value, unsigned size)
+{
+    pl031_state *s = (pl031_state *)opaque;
+
+
+    switch (offset) {
+    case RTC_LR:
+        s->tick_offset += value - pl031_get_count(s);
+        pl031_set_alarm(s);
+        break;
+    case RTC_MR:
+        s->mr = value;
+        pl031_set_alarm(s);
+        break;
+    case RTC_IMSC:
+        s->im = value & 1;
+        DPRINTF("Interrupt mask %d\n", s->im);
+        pl031_update(s);
+        break;
+    case RTC_ICR:
+        /* The PL031 documentation (DDI0224B) states that the interrupt is
+           cleared when bit 0 of the written value is set.  However the
+           arm926e documentation (DDI0287B) states that the interrupt is
+           cleared when any value is written.  */
+        DPRINTF("Interrupt cleared");
+        s->is = 0;
+        pl031_update(s);
+        break;
+    case RTC_CR:
+        /* Written value is ignored.  */
+        break;
+
+    case RTC_DR:
+    case RTC_MIS:
+    case RTC_RIS:
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "pl031: write to read-only register at offset 0x%x\n",
+                      (int)offset);
+        break;
+
+    default:
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "pl031_write: Bad offset 0x%x\n", (int)offset);
+        break;
+    }
+}
+
+static const MemoryRegionOps pl031_ops = {
+    .read = pl031_read,
+    .write = pl031_write,
+    .endianness = DEVICE_NATIVE_ENDIAN,
+};
+
+static int pl031_init(SysBusDevice *dev)
+{
+    pl031_state *s = FROM_SYSBUS(pl031_state, dev);
+    struct tm tm;
+
+    memory_region_init_io(&s->iomem, &pl031_ops, s, "pl031", 0x1000);
+    sysbus_init_mmio(dev, &s->iomem);
+
+    sysbus_init_irq(dev, &s->irq);
+    qemu_get_timedate(&tm, 0);
+    s->tick_offset = mktimegm(&tm) - qemu_get_clock_ns(rtc_clock) / get_ticks_per_sec();
+
+    s->timer = qemu_new_timer_ns(rtc_clock, pl031_interrupt, s);
+    return 0;
+}
+
+static void pl031_pre_save(void *opaque)
+{
+    pl031_state *s = opaque;
+
+    /* tick_offset is base_time - rtc_clock base time.  Instead, we want to
+     * store the base time relative to the vm_clock for backwards-compatibility.  */
+    int64_t delta = qemu_get_clock_ns(rtc_clock) - qemu_get_clock_ns(vm_clock);
+    s->tick_offset_vmstate = s->tick_offset + delta / get_ticks_per_sec();
+}
+
+static int pl031_post_load(void *opaque, int version_id)
+{
+    pl031_state *s = opaque;
+
+    int64_t delta = qemu_get_clock_ns(rtc_clock) - qemu_get_clock_ns(vm_clock);
+    s->tick_offset = s->tick_offset_vmstate - delta / get_ticks_per_sec();
+    pl031_set_alarm(s);
+    return 0;
+}
+
+static const VMStateDescription vmstate_pl031 = {
+    .name = "pl031",
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .pre_save = pl031_pre_save,
+    .post_load = pl031_post_load,
+    .fields = (VMStateField[]) {
+        VMSTATE_UINT32(tick_offset_vmstate, pl031_state),
+        VMSTATE_UINT32(mr, pl031_state),
+        VMSTATE_UINT32(lr, pl031_state),
+        VMSTATE_UINT32(cr, pl031_state),
+        VMSTATE_UINT32(im, pl031_state),
+        VMSTATE_UINT32(is, pl031_state),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
+static void pl031_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
+
+    k->init = pl031_init;
+    dc->no_user = 1;
+    dc->vmsd = &vmstate_pl031;
+}
+
+static const TypeInfo pl031_info = {
+    .name          = "pl031",
+    .parent        = TYPE_SYS_BUS_DEVICE,
+    .instance_size = sizeof(pl031_state),
+    .class_init    = pl031_class_init,
+};
+
+static void pl031_register_types(void)
+{
+    type_register_static(&pl031_info);
+}
+
+type_init(pl031_register_types)