1 /* 2 * QEMU model of the Xilinx timer block. 3 * 4 * Copyright (c) 2009 Edgar E. Iglesias. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to deal 8 * in the Software without restriction, including without limitation the rights 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 * copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 22 * THE SOFTWARE. 23 */ 24 25 #include "qemu/osdep.h" 26 #include "hw/sysbus.h" 27 #include "hw/irq.h" 28 #include "hw/ptimer.h" 29 #include "hw/qdev-properties.h" 30 #include "qemu/log.h" 31 #include "qemu/module.h" 32 33 #define D(x) 34 35 #define R_TCSR 0 36 #define R_TLR 1 37 #define R_TCR 2 38 #define R_MAX 4 39 40 #define TCSR_MDT (1<<0) 41 #define TCSR_UDT (1<<1) 42 #define TCSR_GENT (1<<2) 43 #define TCSR_CAPT (1<<3) 44 #define TCSR_ARHT (1<<4) 45 #define TCSR_LOAD (1<<5) 46 #define TCSR_ENIT (1<<6) 47 #define TCSR_ENT (1<<7) 48 #define TCSR_TINT (1<<8) 49 #define TCSR_PWMA (1<<9) 50 #define TCSR_ENALL (1<<10) 51 52 struct xlx_timer 53 { 54 ptimer_state *ptimer; 55 void *parent; 56 int nr; /* for debug. */ 57 58 unsigned long timer_div; 59 60 uint32_t regs[R_MAX]; 61 }; 62 63 #define TYPE_XILINX_TIMER "xlnx.xps-timer" 64 #define XILINX_TIMER(obj) \ 65 OBJECT_CHECK(struct timerblock, (obj), TYPE_XILINX_TIMER) 66 67 struct timerblock 68 { 69 SysBusDevice parent_obj; 70 71 MemoryRegion mmio; 72 qemu_irq irq; 73 uint8_t one_timer_only; 74 uint32_t freq_hz; 75 struct xlx_timer *timers; 76 }; 77 78 static inline unsigned int num_timers(struct timerblock *t) 79 { 80 return 2 - t->one_timer_only; 81 } 82 83 static inline unsigned int timer_from_addr(hwaddr addr) 84 { 85 /* Timers get a 4x32bit control reg area each. */ 86 return addr >> 2; 87 } 88 89 static void timer_update_irq(struct timerblock *t) 90 { 91 unsigned int i, irq = 0; 92 uint32_t csr; 93 94 for (i = 0; i < num_timers(t); i++) { 95 csr = t->timers[i].regs[R_TCSR]; 96 irq |= (csr & TCSR_TINT) && (csr & TCSR_ENIT); 97 } 98 99 /* All timers within the same slave share a single IRQ line. */ 100 qemu_set_irq(t->irq, !!irq); 101 } 102 103 static uint64_t 104 timer_read(void *opaque, hwaddr addr, unsigned int size) 105 { 106 struct timerblock *t = opaque; 107 struct xlx_timer *xt; 108 uint32_t r = 0; 109 unsigned int timer; 110 111 addr >>= 2; 112 timer = timer_from_addr(addr); 113 xt = &t->timers[timer]; 114 /* Further decoding to address a specific timers reg. */ 115 addr &= 0x3; 116 switch (addr) 117 { 118 case R_TCR: 119 r = ptimer_get_count(xt->ptimer); 120 if (!(xt->regs[R_TCSR] & TCSR_UDT)) 121 r = ~r; 122 D(qemu_log("xlx_timer t=%d read counter=%x udt=%d\n", 123 timer, r, xt->regs[R_TCSR] & TCSR_UDT)); 124 break; 125 default: 126 if (addr < ARRAY_SIZE(xt->regs)) 127 r = xt->regs[addr]; 128 break; 129 130 } 131 D(fprintf(stderr, "%s timer=%d %x=%x\n", __func__, timer, addr * 4, r)); 132 return r; 133 } 134 135 /* Must be called inside ptimer transaction block */ 136 static void timer_enable(struct xlx_timer *xt) 137 { 138 uint64_t count; 139 140 D(fprintf(stderr, "%s timer=%d down=%d\n", __func__, 141 xt->nr, xt->regs[R_TCSR] & TCSR_UDT)); 142 143 ptimer_stop(xt->ptimer); 144 145 if (xt->regs[R_TCSR] & TCSR_UDT) 146 count = xt->regs[R_TLR]; 147 else 148 count = ~0 - xt->regs[R_TLR]; 149 ptimer_set_limit(xt->ptimer, count, 1); 150 ptimer_run(xt->ptimer, 1); 151 } 152 153 static void 154 timer_write(void *opaque, hwaddr addr, 155 uint64_t val64, unsigned int size) 156 { 157 struct timerblock *t = opaque; 158 struct xlx_timer *xt; 159 unsigned int timer; 160 uint32_t value = val64; 161 162 addr >>= 2; 163 timer = timer_from_addr(addr); 164 xt = &t->timers[timer]; 165 D(fprintf(stderr, "%s addr=%x val=%x (timer=%d off=%d)\n", 166 __func__, addr * 4, value, timer, addr & 3)); 167 /* Further decoding to address a specific timers reg. */ 168 addr &= 3; 169 switch (addr) 170 { 171 case R_TCSR: 172 if (value & TCSR_TINT) 173 value &= ~TCSR_TINT; 174 175 xt->regs[addr] = value & 0x7ff; 176 if (value & TCSR_ENT) { 177 ptimer_transaction_begin(xt->ptimer); 178 timer_enable(xt); 179 ptimer_transaction_commit(xt->ptimer); 180 } 181 break; 182 183 default: 184 if (addr < ARRAY_SIZE(xt->regs)) 185 xt->regs[addr] = value; 186 break; 187 } 188 timer_update_irq(t); 189 } 190 191 static const MemoryRegionOps timer_ops = { 192 .read = timer_read, 193 .write = timer_write, 194 .endianness = DEVICE_NATIVE_ENDIAN, 195 .valid = { 196 .min_access_size = 4, 197 .max_access_size = 4 198 } 199 }; 200 201 static void timer_hit(void *opaque) 202 { 203 struct xlx_timer *xt = opaque; 204 struct timerblock *t = xt->parent; 205 D(fprintf(stderr, "%s %d\n", __func__, xt->nr)); 206 xt->regs[R_TCSR] |= TCSR_TINT; 207 208 if (xt->regs[R_TCSR] & TCSR_ARHT) 209 timer_enable(xt); 210 timer_update_irq(t); 211 } 212 213 static void xilinx_timer_realize(DeviceState *dev, Error **errp) 214 { 215 struct timerblock *t = XILINX_TIMER(dev); 216 unsigned int i; 217 218 /* Init all the ptimers. */ 219 t->timers = g_malloc0(sizeof t->timers[0] * num_timers(t)); 220 for (i = 0; i < num_timers(t); i++) { 221 struct xlx_timer *xt = &t->timers[i]; 222 223 xt->parent = t; 224 xt->nr = i; 225 xt->ptimer = ptimer_init(timer_hit, xt, PTIMER_POLICY_DEFAULT); 226 ptimer_transaction_begin(xt->ptimer); 227 ptimer_set_freq(xt->ptimer, t->freq_hz); 228 ptimer_transaction_commit(xt->ptimer); 229 } 230 231 memory_region_init_io(&t->mmio, OBJECT(t), &timer_ops, t, "xlnx.xps-timer", 232 R_MAX * 4 * num_timers(t)); 233 sysbus_init_mmio(SYS_BUS_DEVICE(dev), &t->mmio); 234 } 235 236 static void xilinx_timer_init(Object *obj) 237 { 238 struct timerblock *t = XILINX_TIMER(obj); 239 240 /* All timers share a single irq line. */ 241 sysbus_init_irq(SYS_BUS_DEVICE(obj), &t->irq); 242 } 243 244 static Property xilinx_timer_properties[] = { 245 DEFINE_PROP_UINT32("clock-frequency", struct timerblock, freq_hz, 246 62 * 1000000), 247 DEFINE_PROP_UINT8("one-timer-only", struct timerblock, one_timer_only, 0), 248 DEFINE_PROP_END_OF_LIST(), 249 }; 250 251 static void xilinx_timer_class_init(ObjectClass *klass, void *data) 252 { 253 DeviceClass *dc = DEVICE_CLASS(klass); 254 255 dc->realize = xilinx_timer_realize; 256 device_class_set_props(dc, xilinx_timer_properties); 257 } 258 259 static const TypeInfo xilinx_timer_info = { 260 .name = TYPE_XILINX_TIMER, 261 .parent = TYPE_SYS_BUS_DEVICE, 262 .instance_size = sizeof(struct timerblock), 263 .instance_init = xilinx_timer_init, 264 .class_init = xilinx_timer_class_init, 265 }; 266 267 static void xilinx_timer_register_types(void) 268 { 269 type_register_static(&xilinx_timer_info); 270 } 271 272 type_init(xilinx_timer_register_types) 273