1 /* 2 * SuperH Timer modules. 3 * 4 * Copyright (c) 2007 Magnus Damm 5 * Based on arm_timer.c by Paul Brook 6 * Copyright (c) 2005-2006 CodeSourcery. 7 * 8 * This code is licensed under the GPL. 9 */ 10 11 #include "qemu/osdep.h" 12 #include "hw/hw.h" 13 #include "hw/sh4/sh.h" 14 #include "qemu/timer.h" 15 #include "qemu/main-loop.h" 16 #include "hw/ptimer.h" 17 18 //#define DEBUG_TIMER 19 20 #define TIMER_TCR_TPSC (7 << 0) 21 #define TIMER_TCR_CKEG (3 << 3) 22 #define TIMER_TCR_UNIE (1 << 5) 23 #define TIMER_TCR_ICPE (3 << 6) 24 #define TIMER_TCR_UNF (1 << 8) 25 #define TIMER_TCR_ICPF (1 << 9) 26 #define TIMER_TCR_RESERVED (0x3f << 10) 27 28 #define TIMER_FEAT_CAPT (1 << 0) 29 #define TIMER_FEAT_EXTCLK (1 << 1) 30 31 #define OFFSET_TCOR 0 32 #define OFFSET_TCNT 1 33 #define OFFSET_TCR 2 34 #define OFFSET_TCPR 3 35 36 typedef struct { 37 ptimer_state *timer; 38 uint32_t tcnt; 39 uint32_t tcor; 40 uint32_t tcr; 41 uint32_t tcpr; 42 int freq; 43 int int_level; 44 int old_level; 45 int feat; 46 int enabled; 47 qemu_irq irq; 48 } sh_timer_state; 49 50 /* Check all active timers, and schedule the next timer interrupt. */ 51 52 static void sh_timer_update(sh_timer_state *s) 53 { 54 int new_level = s->int_level && (s->tcr & TIMER_TCR_UNIE); 55 56 if (new_level != s->old_level) 57 qemu_set_irq (s->irq, new_level); 58 59 s->old_level = s->int_level; 60 s->int_level = new_level; 61 } 62 63 static uint32_t sh_timer_read(void *opaque, hwaddr offset) 64 { 65 sh_timer_state *s = (sh_timer_state *)opaque; 66 67 switch (offset >> 2) { 68 case OFFSET_TCOR: 69 return s->tcor; 70 case OFFSET_TCNT: 71 return ptimer_get_count(s->timer); 72 case OFFSET_TCR: 73 return s->tcr | (s->int_level ? TIMER_TCR_UNF : 0); 74 case OFFSET_TCPR: 75 if (s->feat & TIMER_FEAT_CAPT) 76 return s->tcpr; 77 default: 78 hw_error("sh_timer_read: Bad offset %x\n", (int)offset); 79 return 0; 80 } 81 } 82 83 static void sh_timer_write(void *opaque, hwaddr offset, 84 uint32_t value) 85 { 86 sh_timer_state *s = (sh_timer_state *)opaque; 87 int freq; 88 89 switch (offset >> 2) { 90 case OFFSET_TCOR: 91 s->tcor = value; 92 ptimer_set_limit(s->timer, s->tcor, 0); 93 break; 94 case OFFSET_TCNT: 95 s->tcnt = value; 96 ptimer_set_count(s->timer, s->tcnt); 97 break; 98 case OFFSET_TCR: 99 if (s->enabled) { 100 /* Pause the timer if it is running. This may cause some 101 inaccuracy dure to rounding, but avoids a whole lot of other 102 messyness. */ 103 ptimer_stop(s->timer); 104 } 105 freq = s->freq; 106 /* ??? Need to recalculate expiry time after changing divisor. */ 107 switch (value & TIMER_TCR_TPSC) { 108 case 0: freq >>= 2; break; 109 case 1: freq >>= 4; break; 110 case 2: freq >>= 6; break; 111 case 3: freq >>= 8; break; 112 case 4: freq >>= 10; break; 113 case 6: 114 case 7: if (s->feat & TIMER_FEAT_EXTCLK) break; 115 default: hw_error("sh_timer_write: Reserved TPSC value\n"); break; 116 } 117 switch ((value & TIMER_TCR_CKEG) >> 3) { 118 case 0: break; 119 case 1: 120 case 2: 121 case 3: if (s->feat & TIMER_FEAT_EXTCLK) break; 122 default: hw_error("sh_timer_write: Reserved CKEG value\n"); break; 123 } 124 switch ((value & TIMER_TCR_ICPE) >> 6) { 125 case 0: break; 126 case 2: 127 case 3: if (s->feat & TIMER_FEAT_CAPT) break; 128 default: hw_error("sh_timer_write: Reserved ICPE value\n"); break; 129 } 130 if ((value & TIMER_TCR_UNF) == 0) 131 s->int_level = 0; 132 133 value &= ~TIMER_TCR_UNF; 134 135 if ((value & TIMER_TCR_ICPF) && (!(s->feat & TIMER_FEAT_CAPT))) 136 hw_error("sh_timer_write: Reserved ICPF value\n"); 137 138 value &= ~TIMER_TCR_ICPF; /* capture not supported */ 139 140 if (value & TIMER_TCR_RESERVED) 141 hw_error("sh_timer_write: Reserved TCR bits set\n"); 142 s->tcr = value; 143 ptimer_set_limit(s->timer, s->tcor, 0); 144 ptimer_set_freq(s->timer, freq); 145 if (s->enabled) { 146 /* Restart the timer if still enabled. */ 147 ptimer_run(s->timer, 0); 148 } 149 break; 150 case OFFSET_TCPR: 151 if (s->feat & TIMER_FEAT_CAPT) { 152 s->tcpr = value; 153 break; 154 } 155 default: 156 hw_error("sh_timer_write: Bad offset %x\n", (int)offset); 157 } 158 sh_timer_update(s); 159 } 160 161 static void sh_timer_start_stop(void *opaque, int enable) 162 { 163 sh_timer_state *s = (sh_timer_state *)opaque; 164 165 #ifdef DEBUG_TIMER 166 printf("sh_timer_start_stop %d (%d)\n", enable, s->enabled); 167 #endif 168 169 if (s->enabled && !enable) { 170 ptimer_stop(s->timer); 171 } 172 if (!s->enabled && enable) { 173 ptimer_run(s->timer, 0); 174 } 175 s->enabled = !!enable; 176 177 #ifdef DEBUG_TIMER 178 printf("sh_timer_start_stop done %d\n", s->enabled); 179 #endif 180 } 181 182 static void sh_timer_tick(void *opaque) 183 { 184 sh_timer_state *s = (sh_timer_state *)opaque; 185 s->int_level = s->enabled; 186 sh_timer_update(s); 187 } 188 189 static void *sh_timer_init(uint32_t freq, int feat, qemu_irq irq) 190 { 191 sh_timer_state *s; 192 QEMUBH *bh; 193 194 s = (sh_timer_state *)g_malloc0(sizeof(sh_timer_state)); 195 s->freq = freq; 196 s->feat = feat; 197 s->tcor = 0xffffffff; 198 s->tcnt = 0xffffffff; 199 s->tcpr = 0xdeadbeef; 200 s->tcr = 0; 201 s->enabled = 0; 202 s->irq = irq; 203 204 bh = qemu_bh_new(sh_timer_tick, s); 205 s->timer = ptimer_init(bh, PTIMER_POLICY_DEFAULT); 206 207 sh_timer_write(s, OFFSET_TCOR >> 2, s->tcor); 208 sh_timer_write(s, OFFSET_TCNT >> 2, s->tcnt); 209 sh_timer_write(s, OFFSET_TCPR >> 2, s->tcpr); 210 sh_timer_write(s, OFFSET_TCR >> 2, s->tcpr); 211 /* ??? Save/restore. */ 212 return s; 213 } 214 215 typedef struct { 216 MemoryRegion iomem; 217 MemoryRegion iomem_p4; 218 MemoryRegion iomem_a7; 219 void *timer[3]; 220 int level[3]; 221 uint32_t tocr; 222 uint32_t tstr; 223 int feat; 224 } tmu012_state; 225 226 static uint64_t tmu012_read(void *opaque, hwaddr offset, 227 unsigned size) 228 { 229 tmu012_state *s = (tmu012_state *)opaque; 230 231 #ifdef DEBUG_TIMER 232 printf("tmu012_read 0x%lx\n", (unsigned long) offset); 233 #endif 234 235 if (offset >= 0x20) { 236 if (!(s->feat & TMU012_FEAT_3CHAN)) 237 hw_error("tmu012_write: Bad channel offset %x\n", (int)offset); 238 return sh_timer_read(s->timer[2], offset - 0x20); 239 } 240 241 if (offset >= 0x14) 242 return sh_timer_read(s->timer[1], offset - 0x14); 243 244 if (offset >= 0x08) 245 return sh_timer_read(s->timer[0], offset - 0x08); 246 247 if (offset == 4) 248 return s->tstr; 249 250 if ((s->feat & TMU012_FEAT_TOCR) && offset == 0) 251 return s->tocr; 252 253 hw_error("tmu012_write: Bad offset %x\n", (int)offset); 254 return 0; 255 } 256 257 static void tmu012_write(void *opaque, hwaddr offset, 258 uint64_t value, unsigned size) 259 { 260 tmu012_state *s = (tmu012_state *)opaque; 261 262 #ifdef DEBUG_TIMER 263 printf("tmu012_write 0x%lx 0x%08x\n", (unsigned long) offset, value); 264 #endif 265 266 if (offset >= 0x20) { 267 if (!(s->feat & TMU012_FEAT_3CHAN)) 268 hw_error("tmu012_write: Bad channel offset %x\n", (int)offset); 269 sh_timer_write(s->timer[2], offset - 0x20, value); 270 return; 271 } 272 273 if (offset >= 0x14) { 274 sh_timer_write(s->timer[1], offset - 0x14, value); 275 return; 276 } 277 278 if (offset >= 0x08) { 279 sh_timer_write(s->timer[0], offset - 0x08, value); 280 return; 281 } 282 283 if (offset == 4) { 284 sh_timer_start_stop(s->timer[0], value & (1 << 0)); 285 sh_timer_start_stop(s->timer[1], value & (1 << 1)); 286 if (s->feat & TMU012_FEAT_3CHAN) 287 sh_timer_start_stop(s->timer[2], value & (1 << 2)); 288 else 289 if (value & (1 << 2)) 290 hw_error("tmu012_write: Bad channel\n"); 291 292 s->tstr = value; 293 return; 294 } 295 296 if ((s->feat & TMU012_FEAT_TOCR) && offset == 0) { 297 s->tocr = value & (1 << 0); 298 } 299 } 300 301 static const MemoryRegionOps tmu012_ops = { 302 .read = tmu012_read, 303 .write = tmu012_write, 304 .endianness = DEVICE_NATIVE_ENDIAN, 305 }; 306 307 void tmu012_init(MemoryRegion *sysmem, hwaddr base, 308 int feat, uint32_t freq, 309 qemu_irq ch0_irq, qemu_irq ch1_irq, 310 qemu_irq ch2_irq0, qemu_irq ch2_irq1) 311 { 312 tmu012_state *s; 313 int timer_feat = (feat & TMU012_FEAT_EXTCLK) ? TIMER_FEAT_EXTCLK : 0; 314 315 s = (tmu012_state *)g_malloc0(sizeof(tmu012_state)); 316 s->feat = feat; 317 s->timer[0] = sh_timer_init(freq, timer_feat, ch0_irq); 318 s->timer[1] = sh_timer_init(freq, timer_feat, ch1_irq); 319 if (feat & TMU012_FEAT_3CHAN) 320 s->timer[2] = sh_timer_init(freq, timer_feat | TIMER_FEAT_CAPT, 321 ch2_irq0); /* ch2_irq1 not supported */ 322 323 memory_region_init_io(&s->iomem, NULL, &tmu012_ops, s, 324 "timer", 0x100000000ULL); 325 326 memory_region_init_alias(&s->iomem_p4, NULL, "timer-p4", 327 &s->iomem, 0, 0x1000); 328 memory_region_add_subregion(sysmem, P4ADDR(base), &s->iomem_p4); 329 330 memory_region_init_alias(&s->iomem_a7, NULL, "timer-a7", 331 &s->iomem, 0, 0x1000); 332 memory_region_add_subregion(sysmem, A7ADDR(base), &s->iomem_a7); 333 /* ??? Save/restore. */ 334 } 335