1 /* 2 * Block model of System timer present in 3 * Microsemi's SmartFusion2 and SmartFusion SoCs. 4 * 5 * Copyright (c) 2017 Subbaraya Sundeep <sundeep.lkml@gmail.com>. 6 * 7 * Permission is hereby granted, free of charge, to any person obtaining a copy 8 * of this software and associated documentation files (the "Software"), to deal 9 * in the Software without restriction, including without limitation the rights 10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 11 * copies of the Software, and to permit persons to whom the Software is 12 * furnished to do so, subject to the following conditions: 13 * 14 * The above copyright notice and this permission notice shall be included in 15 * all copies or substantial portions of the Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 23 * THE SOFTWARE. 24 */ 25 26 #include "qemu/osdep.h" 27 #include "qemu/module.h" 28 #include "qemu/log.h" 29 #include "hw/irq.h" 30 #include "hw/qdev-properties.h" 31 #include "hw/timer/mss-timer.h" 32 #include "migration/vmstate.h" 33 34 #ifndef MSS_TIMER_ERR_DEBUG 35 #define MSS_TIMER_ERR_DEBUG 0 36 #endif 37 38 #define DB_PRINT_L(lvl, fmt, args...) do { \ 39 if (MSS_TIMER_ERR_DEBUG >= lvl) { \ 40 qemu_log("%s: " fmt "\n", __func__, ## args); \ 41 } \ 42 } while (0) 43 44 #define DB_PRINT(fmt, args...) DB_PRINT_L(1, fmt, ## args) 45 46 #define R_TIM_VAL 0 47 #define R_TIM_LOADVAL 1 48 #define R_TIM_BGLOADVAL 2 49 #define R_TIM_CTRL 3 50 #define R_TIM_RIS 4 51 #define R_TIM_MIS 5 52 53 #define TIMER_CTRL_ENBL (1 << 0) 54 #define TIMER_CTRL_ONESHOT (1 << 1) 55 #define TIMER_CTRL_INTR (1 << 2) 56 #define TIMER_RIS_ACK (1 << 0) 57 #define TIMER_RST_CLR (1 << 6) 58 #define TIMER_MODE (1 << 0) 59 60 static void timer_update_irq(struct Msf2Timer *st) 61 { 62 bool isr, ier; 63 64 isr = !!(st->regs[R_TIM_RIS] & TIMER_RIS_ACK); 65 ier = !!(st->regs[R_TIM_CTRL] & TIMER_CTRL_INTR); 66 qemu_set_irq(st->irq, (ier && isr)); 67 } 68 69 /* Must be called from within a ptimer_transaction_begin/commit block */ 70 static void timer_update(struct Msf2Timer *st) 71 { 72 uint64_t count; 73 74 if (!(st->regs[R_TIM_CTRL] & TIMER_CTRL_ENBL)) { 75 ptimer_stop(st->ptimer); 76 return; 77 } 78 79 count = st->regs[R_TIM_LOADVAL]; 80 ptimer_set_limit(st->ptimer, count, 1); 81 ptimer_run(st->ptimer, 1); 82 } 83 84 static uint64_t 85 timer_read(void *opaque, hwaddr offset, unsigned int size) 86 { 87 MSSTimerState *t = opaque; 88 hwaddr addr; 89 struct Msf2Timer *st; 90 uint32_t ret = 0; 91 int timer = 0; 92 int isr; 93 int ier; 94 95 addr = offset >> 2; 96 /* 97 * Two independent timers has same base address. 98 * Based on address passed figure out which timer is being used. 99 */ 100 if ((addr >= R_TIM1_MAX) && (addr < NUM_TIMERS * R_TIM1_MAX)) { 101 timer = 1; 102 addr -= R_TIM1_MAX; 103 } 104 105 st = &t->timers[timer]; 106 107 switch (addr) { 108 case R_TIM_VAL: 109 ret = ptimer_get_count(st->ptimer); 110 break; 111 112 case R_TIM_MIS: 113 isr = !!(st->regs[R_TIM_RIS] & TIMER_RIS_ACK); 114 ier = !!(st->regs[R_TIM_CTRL] & TIMER_CTRL_INTR); 115 ret = ier & isr; 116 break; 117 118 default: 119 if (addr < R_TIM1_MAX) { 120 ret = st->regs[addr]; 121 } else { 122 qemu_log_mask(LOG_GUEST_ERROR, 123 TYPE_MSS_TIMER": 64-bit mode not supported\n"); 124 return ret; 125 } 126 break; 127 } 128 129 DB_PRINT("timer=%d 0x%" HWADDR_PRIx "=0x%" PRIx32, timer, offset, 130 ret); 131 return ret; 132 } 133 134 static void 135 timer_write(void *opaque, hwaddr offset, 136 uint64_t val64, unsigned int size) 137 { 138 MSSTimerState *t = opaque; 139 hwaddr addr; 140 struct Msf2Timer *st; 141 int timer = 0; 142 uint32_t value = val64; 143 144 addr = offset >> 2; 145 /* 146 * Two independent timers has same base address. 147 * Based on addr passed figure out which timer is being used. 148 */ 149 if ((addr >= R_TIM1_MAX) && (addr < NUM_TIMERS * R_TIM1_MAX)) { 150 timer = 1; 151 addr -= R_TIM1_MAX; 152 } 153 154 st = &t->timers[timer]; 155 156 DB_PRINT("addr=0x%" HWADDR_PRIx " val=0x%" PRIx32 " (timer=%d)", offset, 157 value, timer); 158 159 switch (addr) { 160 case R_TIM_CTRL: 161 st->regs[R_TIM_CTRL] = value; 162 ptimer_transaction_begin(st->ptimer); 163 timer_update(st); 164 ptimer_transaction_commit(st->ptimer); 165 break; 166 167 case R_TIM_RIS: 168 if (value & TIMER_RIS_ACK) { 169 st->regs[R_TIM_RIS] &= ~TIMER_RIS_ACK; 170 } 171 break; 172 173 case R_TIM_LOADVAL: 174 st->regs[R_TIM_LOADVAL] = value; 175 if (st->regs[R_TIM_CTRL] & TIMER_CTRL_ENBL) { 176 ptimer_transaction_begin(st->ptimer); 177 timer_update(st); 178 ptimer_transaction_commit(st->ptimer); 179 } 180 break; 181 182 case R_TIM_BGLOADVAL: 183 st->regs[R_TIM_BGLOADVAL] = value; 184 st->regs[R_TIM_LOADVAL] = value; 185 break; 186 187 case R_TIM_VAL: 188 case R_TIM_MIS: 189 break; 190 191 default: 192 if (addr < R_TIM1_MAX) { 193 st->regs[addr] = value; 194 } else { 195 qemu_log_mask(LOG_GUEST_ERROR, 196 TYPE_MSS_TIMER": 64-bit mode not supported\n"); 197 return; 198 } 199 break; 200 } 201 timer_update_irq(st); 202 } 203 204 static const MemoryRegionOps timer_ops = { 205 .read = timer_read, 206 .write = timer_write, 207 .endianness = DEVICE_NATIVE_ENDIAN, 208 .valid = { 209 .min_access_size = 1, 210 .max_access_size = 4 211 } 212 }; 213 214 static void timer_hit(void *opaque) 215 { 216 struct Msf2Timer *st = opaque; 217 218 st->regs[R_TIM_RIS] |= TIMER_RIS_ACK; 219 220 if (!(st->regs[R_TIM_CTRL] & TIMER_CTRL_ONESHOT)) { 221 timer_update(st); 222 } 223 timer_update_irq(st); 224 } 225 226 static void mss_timer_init(Object *obj) 227 { 228 MSSTimerState *t = MSS_TIMER(obj); 229 int i; 230 231 /* Init all the ptimers. */ 232 for (i = 0; i < NUM_TIMERS; i++) { 233 struct Msf2Timer *st = &t->timers[i]; 234 235 st->ptimer = ptimer_init(timer_hit, st, PTIMER_POLICY_DEFAULT); 236 ptimer_transaction_begin(st->ptimer); 237 ptimer_set_freq(st->ptimer, t->freq_hz); 238 ptimer_transaction_commit(st->ptimer); 239 sysbus_init_irq(SYS_BUS_DEVICE(obj), &st->irq); 240 } 241 242 memory_region_init_io(&t->mmio, OBJECT(t), &timer_ops, t, TYPE_MSS_TIMER, 243 NUM_TIMERS * R_TIM1_MAX * 4); 244 sysbus_init_mmio(SYS_BUS_DEVICE(obj), &t->mmio); 245 } 246 247 static void mss_timer_finalize(Object *obj) 248 { 249 MSSTimerState *t = MSS_TIMER(obj); 250 int i; 251 252 for (i = 0; i < NUM_TIMERS; i++) { 253 struct Msf2Timer *st = &t->timers[i]; 254 255 ptimer_free(st->ptimer); 256 } 257 } 258 259 static const VMStateDescription vmstate_timers = { 260 .name = "mss-timer-block", 261 .version_id = 1, 262 .minimum_version_id = 1, 263 .fields = (VMStateField[]) { 264 VMSTATE_PTIMER(ptimer, struct Msf2Timer), 265 VMSTATE_UINT32_ARRAY(regs, struct Msf2Timer, R_TIM1_MAX), 266 VMSTATE_END_OF_LIST() 267 } 268 }; 269 270 static const VMStateDescription vmstate_mss_timer = { 271 .name = TYPE_MSS_TIMER, 272 .version_id = 1, 273 .minimum_version_id = 1, 274 .fields = (VMStateField[]) { 275 VMSTATE_UINT32(freq_hz, MSSTimerState), 276 VMSTATE_STRUCT_ARRAY(timers, MSSTimerState, NUM_TIMERS, 0, 277 vmstate_timers, struct Msf2Timer), 278 VMSTATE_END_OF_LIST() 279 } 280 }; 281 282 static Property mss_timer_properties[] = { 283 /* Libero GUI shows 100Mhz as default for clocks */ 284 DEFINE_PROP_UINT32("clock-frequency", MSSTimerState, freq_hz, 285 100 * 1000000), 286 DEFINE_PROP_END_OF_LIST(), 287 }; 288 289 static void mss_timer_class_init(ObjectClass *klass, void *data) 290 { 291 DeviceClass *dc = DEVICE_CLASS(klass); 292 293 device_class_set_props(dc, mss_timer_properties); 294 dc->vmsd = &vmstate_mss_timer; 295 } 296 297 static const TypeInfo mss_timer_info = { 298 .name = TYPE_MSS_TIMER, 299 .parent = TYPE_SYS_BUS_DEVICE, 300 .instance_size = sizeof(MSSTimerState), 301 .instance_init = mss_timer_init, 302 .instance_finalize = mss_timer_finalize, 303 .class_init = mss_timer_class_init, 304 }; 305 306 static void mss_timer_register_types(void) 307 { 308 type_register_static(&mss_timer_info); 309 } 310 311 type_init(mss_timer_register_types) 312