hw/timer/allwinner-a10-pit.c

   1 /*
   2  * Allwinner A10 timer device emulation
   3  *
   4  * Copyright (C) 2013 Li Guang
   5  * Written by Li Guang <lig.fnst@cn.fujitsu.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the
   9  * Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful, but WITHOUT
  13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
  15  * for more details.
  16  */
  17
  18 #include "hw/sysbus.h"
  19 #include "sysemu/sysemu.h"
  20 #include "hw/timer/allwinner-a10-pit.h"
  21
  22 static void a10_pit_update_irq(AwA10PITState *s)
  23 {
  24     int i;
  25
  26     for (i = 0; i < AW_A10_PIT_TIMER_NR; i++) {
  27         qemu_set_irq(s->irq[i], !!(s->irq_status & s->irq_enable & (1 << i)));
  28     }
  29 }
  30
  31 static uint64_t a10_pit_read(void *opaque, hwaddr offset, unsigned size)
  32 {
  33     AwA10PITState *s = AW_A10_PIT(opaque);
  34     uint8_t index;
  35
  36     switch (offset) {
  37     case AW_A10_PIT_TIMER_IRQ_EN:
  38         return s->irq_enable;
  39     case AW_A10_PIT_TIMER_IRQ_ST:
  40         return s->irq_status;
  41     case AW_A10_PIT_TIMER_BASE ... AW_A10_PIT_TIMER_BASE_END:
  42         index = offset & 0xf0;
  43         index >>= 4;
  44         index -= 1;
  45         switch (offset & 0x0f) {
  46         case AW_A10_PIT_TIMER_CONTROL:
  47             return s->control[index];
  48         case AW_A10_PIT_TIMER_INTERVAL:
  49             return s->interval[index];
  50         case AW_A10_PIT_TIMER_COUNT:
  51             s->count[index] = ptimer_get_count(s->timer[index]);
  52             return s->count[index];
  53         default:
  54             qemu_log_mask(LOG_GUEST_ERROR,
  55                           "%s: Bad offset 0x%x\n",  __func__, (int)offset);
  56             break;
  57         }
  58     case AW_A10_PIT_WDOG_CONTROL:
  59         break;
  60     case AW_A10_PIT_WDOG_MODE:
  61         break;
  62     case AW_A10_PIT_COUNT_LO:
  63         return s->count_lo;
  64     case AW_A10_PIT_COUNT_HI:
  65         return s->count_hi;
  66     case AW_A10_PIT_COUNT_CTL:
  67         return s->count_ctl;
  68     default:
  69         qemu_log_mask(LOG_GUEST_ERROR,
  70                       "%s: Bad offset 0x%x\n",  __func__, (int)offset);
  71         break;
  72     }
  73
  74     return 0;
  75 }
  76
  77 static void a10_pit_set_freq(AwA10PITState *s, int index)
  78 {
  79     uint32_t prescaler, source, source_freq;
  80
  81     prescaler = 1 << extract32(s->control[index], 4, 3);
  82     source = extract32(s->control[index], 2, 2);
  83     source_freq = s->clk_freq[source];
  84
  85     if (source_freq) {
  86         ptimer_set_freq(s->timer[index], source_freq / prescaler);
  87     } else {
  88         qemu_log_mask(LOG_GUEST_ERROR, "%s: Invalid clock source %u\n",
  89                       __func__, source);
  90     }
  91 }
  92
  93 static void a10_pit_write(void *opaque, hwaddr offset, uint64_t value,
  94                             unsigned size)
  95 {
  96      AwA10PITState *s = AW_A10_PIT(opaque);
  97      uint8_t index;
  98
  99     switch (offset) {
 100     case AW_A10_PIT_TIMER_IRQ_EN:
 101         s->irq_enable = value;
 102         a10_pit_update_irq(s);
 103         break;
 104     case AW_A10_PIT_TIMER_IRQ_ST:
 105         s->irq_status &= ~value;
 106         a10_pit_update_irq(s);
 107         break;
 108     case AW_A10_PIT_TIMER_BASE ... AW_A10_PIT_TIMER_BASE_END:
 109         index = offset & 0xf0;
 110         index >>= 4;
 111         index -= 1;
 112         switch (offset & 0x0f) {
 113         case AW_A10_PIT_TIMER_CONTROL:
 114             s->control[index] = value;
 115             a10_pit_set_freq(s, index);
 116             if (s->control[index] & AW_A10_PIT_TIMER_RELOAD) {
 117                 ptimer_set_count(s->timer[index], s->interval[index]);
 118             }
 119             if (s->control[index] & AW_A10_PIT_TIMER_EN) {
 120                 int oneshot = 0;
 121                 if (s->control[index] & AW_A10_PIT_TIMER_MODE) {
 122                     oneshot = 1;
 123                 }
 124                 ptimer_run(s->timer[index], oneshot);
 125             } else {
 126                 ptimer_stop(s->timer[index]);
 127             }
 128             break;
 129         case AW_A10_PIT_TIMER_INTERVAL:
 130             s->interval[index] = value;
 131             ptimer_set_limit(s->timer[index], s->interval[index], 1);
 132             break;
 133         case AW_A10_PIT_TIMER_COUNT:
 134             s->count[index] = value;
 135             break;
 136         default:
 137             qemu_log_mask(LOG_GUEST_ERROR,
 138                           "%s: Bad offset 0x%x\n",  __func__, (int)offset);
 139         }
 140         break;
 141     case AW_A10_PIT_WDOG_CONTROL:
 142         s->watch_dog_control = value;
 143         break;
 144     case AW_A10_PIT_WDOG_MODE:
 145         s->watch_dog_mode = value;
 146         break;
 147     case AW_A10_PIT_COUNT_LO:
 148         s->count_lo = value;
 149         break;
 150     case AW_A10_PIT_COUNT_HI:
 151         s->count_hi = value;
 152         break;
 153     case AW_A10_PIT_COUNT_CTL:
 154         s->count_ctl = value;
 155         if (s->count_ctl & AW_A10_PIT_COUNT_RL_EN) {
 156             uint64_t  tmp_count = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
 157
 158             s->count_lo = tmp_count;
 159             s->count_hi = tmp_count >> 32;
 160             s->count_ctl &= ~AW_A10_PIT_COUNT_RL_EN;
 161         }
 162         if (s->count_ctl & AW_A10_PIT_COUNT_CLR_EN) {
 163             s->count_lo = 0;
 164             s->count_hi = 0;
 165             s->count_ctl &= ~AW_A10_PIT_COUNT_CLR_EN;
 166         }
 167         break;
 168     default:
 169         qemu_log_mask(LOG_GUEST_ERROR,
 170                       "%s: Bad offset 0x%x\n",  __func__, (int)offset);
 171         break;
 172     }
 173 }
 174
 175 static const MemoryRegionOps a10_pit_ops = {
 176     .read = a10_pit_read,
 177     .write = a10_pit_write,
 178     .endianness = DEVICE_NATIVE_ENDIAN,
 179 };
 180
 181 static Property a10_pit_properties[] = {
 182     DEFINE_PROP_UINT32("clk0-freq", AwA10PITState, clk_freq[0], 0),
 183     DEFINE_PROP_UINT32("clk1-freq", AwA10PITState, clk_freq[1], 0),
 184     DEFINE_PROP_UINT32("clk2-freq", AwA10PITState, clk_freq[2], 0),
 185     DEFINE_PROP_UINT32("clk3-freq", AwA10PITState, clk_freq[3], 0),
 186     DEFINE_PROP_END_OF_LIST(),
 187 };
 188
 189 static const VMStateDescription vmstate_a10_pit = {
 190     .name = "a10.pit",
 191     .version_id = 1,
 192     .minimum_version_id = 1,
 193     .fields = (VMStateField[]) {
 194         VMSTATE_UINT32(irq_enable, AwA10PITState),
 195         VMSTATE_UINT32(irq_status, AwA10PITState),
 196         VMSTATE_UINT32_ARRAY(control, AwA10PITState, AW_A10_PIT_TIMER_NR),
 197         VMSTATE_UINT32_ARRAY(interval, AwA10PITState, AW_A10_PIT_TIMER_NR),
 198         VMSTATE_UINT32_ARRAY(count, AwA10PITState, AW_A10_PIT_TIMER_NR),
 199         VMSTATE_UINT32(watch_dog_mode, AwA10PITState),
 200         VMSTATE_UINT32(watch_dog_control, AwA10PITState),
 201         VMSTATE_UINT32(count_lo, AwA10PITState),
 202         VMSTATE_UINT32(count_hi, AwA10PITState),
 203         VMSTATE_UINT32(count_ctl, AwA10PITState),
 204         VMSTATE_PTIMER_ARRAY(timer, AwA10PITState, AW_A10_PIT_TIMER_NR),
 205         VMSTATE_END_OF_LIST()
 206     }
 207 };
 208
 209 static void a10_pit_reset(DeviceState *dev)
 210 {
 211     AwA10PITState *s = AW_A10_PIT(dev);
 212     uint8_t i;
 213
 214     s->irq_enable = 0;
 215     s->irq_status = 0;
 216     a10_pit_update_irq(s);
 217
 218     for (i = 0; i < 6; i++) {
 219         s->control[i] = AW_A10_PIT_DEFAULT_CLOCK;
 220         s->interval[i] = 0;
 221         s->count[i] = 0;
 222         ptimer_stop(s->timer[i]);
 223         a10_pit_set_freq(s, i);
 224     }
 225     s->watch_dog_mode = 0;
 226     s->watch_dog_control = 0;
 227     s->count_lo = 0;
 228     s->count_hi = 0;
 229     s->count_ctl = 0;
 230 }
 231
 232 static void a10_pit_timer_cb(void *opaque)
 233 {
 234     AwA10TimerContext *tc = opaque;
 235     AwA10PITState *s = tc->container;
 236     uint8_t i = tc->index;
 237
 238     if (s->control[i] & AW_A10_PIT_TIMER_EN) {
 239         s->irq_status |= 1 << i;
 240         if (s->control[i] & AW_A10_PIT_TIMER_MODE) {
 241             ptimer_stop(s->timer[i]);
 242             s->control[i] &= ~AW_A10_PIT_TIMER_EN;
 243         }
 244         a10_pit_update_irq(s);
 245     }
 246 }
 247
 248 static void a10_pit_init(Object *obj)
 249 {
 250     AwA10PITState *s = AW_A10_PIT(obj);
 251     SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
 252     QEMUBH * bh[AW_A10_PIT_TIMER_NR];
 253     uint8_t i;
 254
 255     for (i = 0; i < AW_A10_PIT_TIMER_NR; i++) {
 256         sysbus_init_irq(sbd, &s->irq[i]);
 257     }
 258     memory_region_init_io(&s->iomem, OBJECT(s), &a10_pit_ops, s,
 259                           TYPE_AW_A10_PIT, 0x400);
 260     sysbus_init_mmio(sbd, &s->iomem);
 261
 262     for (i = 0; i < AW_A10_PIT_TIMER_NR; i++) {
 263         AwA10TimerContext *tc = &s->timer_context[i];
 264
 265         tc->container = s;
 266         tc->index = i;
 267         bh[i] = qemu_bh_new(a10_pit_timer_cb, tc);
 268         s->timer[i] = ptimer_init(bh[i]);
 269     }
 270 }
 271
 272 static void a10_pit_class_init(ObjectClass *klass, void *data)
 273 {
 274     DeviceClass *dc = DEVICE_CLASS(klass);
 275
 276     dc->reset = a10_pit_reset;
 277     dc->props = a10_pit_properties;
 278     dc->desc = "allwinner a10 timer";
 279     dc->vmsd = &vmstate_a10_pit;
 280 }
 281
 282 static const TypeInfo a10_pit_info = {
 283     .name = TYPE_AW_A10_PIT,
 284     .parent = TYPE_SYS_BUS_DEVICE,
 285     .instance_size = sizeof(AwA10PITState),
 286     .instance_init = a10_pit_init,
 287     .class_init = a10_pit_class_init,
 288 };
 289
 290 static void a10_register_types(void)
 291 {
 292     type_register_static(&a10_pit_info);
 293 }
 294
 295 type_init(a10_register_types);