1 /* 2 * IMX31 Clock Control Module 3 * 4 * Copyright (C) 2012 NICTA 5 * Updated by Jean-Christophe Dubois <jcd@tribudubois.net> 6 * 7 * This work is licensed under the terms of the GNU GPL, version 2 or later. 8 * See the COPYING file in the top-level directory. 9 * 10 * To get the timer frequencies right, we need to emulate at least part of 11 * the i.MX31 CCM. 12 */ 13 14 #include "qemu/osdep.h" 15 #include "hw/misc/imx31_ccm.h" 16 #include "migration/vmstate.h" 17 #include "qemu/log.h" 18 #include "qemu/module.h" 19 20 #define CKIH_FREQ 26000000 /* 26MHz crystal input */ 21 22 #ifndef DEBUG_IMX31_CCM 23 #define DEBUG_IMX31_CCM 0 24 #endif 25 26 #define DPRINTF(fmt, args...) \ 27 do { \ 28 if (DEBUG_IMX31_CCM) { \ 29 fprintf(stderr, "[%s]%s: " fmt , TYPE_IMX31_CCM, \ 30 __func__, ##args); \ 31 } \ 32 } while (0) 33 34 static const char *imx31_ccm_reg_name(uint32_t reg) 35 { 36 static char unknown[20]; 37 38 switch (reg) { 39 case IMX31_CCM_CCMR_REG: 40 return "CCMR"; 41 case IMX31_CCM_PDR0_REG: 42 return "PDR0"; 43 case IMX31_CCM_PDR1_REG: 44 return "PDR1"; 45 case IMX31_CCM_RCSR_REG: 46 return "RCSR"; 47 case IMX31_CCM_MPCTL_REG: 48 return "MPCTL"; 49 case IMX31_CCM_UPCTL_REG: 50 return "UPCTL"; 51 case IMX31_CCM_SPCTL_REG: 52 return "SPCTL"; 53 case IMX31_CCM_COSR_REG: 54 return "COSR"; 55 case IMX31_CCM_CGR0_REG: 56 return "CGR0"; 57 case IMX31_CCM_CGR1_REG: 58 return "CGR1"; 59 case IMX31_CCM_CGR2_REG: 60 return "CGR2"; 61 case IMX31_CCM_WIMR_REG: 62 return "WIMR"; 63 case IMX31_CCM_LDC_REG: 64 return "LDC"; 65 case IMX31_CCM_DCVR0_REG: 66 return "DCVR0"; 67 case IMX31_CCM_DCVR1_REG: 68 return "DCVR1"; 69 case IMX31_CCM_DCVR2_REG: 70 return "DCVR2"; 71 case IMX31_CCM_DCVR3_REG: 72 return "DCVR3"; 73 case IMX31_CCM_LTR0_REG: 74 return "LTR0"; 75 case IMX31_CCM_LTR1_REG: 76 return "LTR1"; 77 case IMX31_CCM_LTR2_REG: 78 return "LTR2"; 79 case IMX31_CCM_LTR3_REG: 80 return "LTR3"; 81 case IMX31_CCM_LTBR0_REG: 82 return "LTBR0"; 83 case IMX31_CCM_LTBR1_REG: 84 return "LTBR1"; 85 case IMX31_CCM_PMCR0_REG: 86 return "PMCR0"; 87 case IMX31_CCM_PMCR1_REG: 88 return "PMCR1"; 89 case IMX31_CCM_PDR2_REG: 90 return "PDR2"; 91 default: 92 snprintf(unknown, sizeof(unknown), "[%u ?]", reg); 93 return unknown; 94 } 95 } 96 97 static const VMStateDescription vmstate_imx31_ccm = { 98 .name = TYPE_IMX31_CCM, 99 .version_id = 2, 100 .minimum_version_id = 2, 101 .fields = (const VMStateField[]) { 102 VMSTATE_UINT32_ARRAY(reg, IMX31CCMState, IMX31_CCM_MAX_REG), 103 VMSTATE_END_OF_LIST() 104 }, 105 }; 106 107 static uint32_t imx31_ccm_get_pll_ref_clk(IMXCCMState *dev) 108 { 109 uint32_t freq = 0; 110 IMX31CCMState *s = IMX31_CCM(dev); 111 112 if ((s->reg[IMX31_CCM_CCMR_REG] & CCMR_PRCS) == 2) { 113 if (s->reg[IMX31_CCM_CCMR_REG] & CCMR_FPME) { 114 freq = CKIL_FREQ; 115 if (s->reg[IMX31_CCM_CCMR_REG] & CCMR_FPMF) { 116 freq *= 1024; 117 } 118 } 119 } else { 120 freq = CKIH_FREQ; 121 } 122 123 DPRINTF("freq = %u\n", freq); 124 125 return freq; 126 } 127 128 static uint32_t imx31_ccm_get_mpll_clk(IMXCCMState *dev) 129 { 130 uint32_t freq; 131 IMX31CCMState *s = IMX31_CCM(dev); 132 133 freq = imx_ccm_calc_pll(s->reg[IMX31_CCM_MPCTL_REG], 134 imx31_ccm_get_pll_ref_clk(dev)); 135 136 DPRINTF("freq = %u\n", freq); 137 138 return freq; 139 } 140 141 static uint32_t imx31_ccm_get_mcu_main_clk(IMXCCMState *dev) 142 { 143 uint32_t freq; 144 IMX31CCMState *s = IMX31_CCM(dev); 145 146 if ((s->reg[IMX31_CCM_CCMR_REG] & CCMR_MDS) || 147 !(s->reg[IMX31_CCM_CCMR_REG] & CCMR_MPE)) { 148 freq = imx31_ccm_get_pll_ref_clk(dev); 149 } else { 150 freq = imx31_ccm_get_mpll_clk(dev); 151 } 152 153 DPRINTF("freq = %u\n", freq); 154 155 return freq; 156 } 157 158 static uint32_t imx31_ccm_get_hclk_clk(IMXCCMState *dev) 159 { 160 uint32_t freq; 161 IMX31CCMState *s = IMX31_CCM(dev); 162 163 freq = imx31_ccm_get_mcu_main_clk(dev) 164 / (1 + EXTRACT(s->reg[IMX31_CCM_PDR0_REG], MAX)); 165 166 DPRINTF("freq = %u\n", freq); 167 168 return freq; 169 } 170 171 static uint32_t imx31_ccm_get_ipg_clk(IMXCCMState *dev) 172 { 173 uint32_t freq; 174 IMX31CCMState *s = IMX31_CCM(dev); 175 176 freq = imx31_ccm_get_hclk_clk(dev) 177 / (1 + EXTRACT(s->reg[IMX31_CCM_PDR0_REG], IPG)); 178 179 DPRINTF("freq = %u\n", freq); 180 181 return freq; 182 } 183 184 static uint32_t imx31_ccm_get_clock_frequency(IMXCCMState *dev, IMXClk clock) 185 { 186 uint32_t freq = 0; 187 188 switch (clock) { 189 case CLK_NONE: 190 break; 191 case CLK_IPG: 192 case CLK_IPG_HIGH: 193 freq = imx31_ccm_get_ipg_clk(dev); 194 break; 195 case CLK_32k: 196 freq = CKIL_FREQ; 197 break; 198 default: 199 qemu_log_mask(LOG_GUEST_ERROR, "[%s]%s: unsupported clock %d\n", 200 TYPE_IMX31_CCM, __func__, clock); 201 break; 202 } 203 204 DPRINTF("Clock = %d) = %u\n", clock, freq); 205 206 return freq; 207 } 208 209 static void imx31_ccm_reset(DeviceState *dev) 210 { 211 IMX31CCMState *s = IMX31_CCM(dev); 212 213 DPRINTF("()\n"); 214 215 memset(s->reg, 0, sizeof(uint32_t) * IMX31_CCM_MAX_REG); 216 217 s->reg[IMX31_CCM_CCMR_REG] = 0x074b0b7d; 218 s->reg[IMX31_CCM_PDR0_REG] = 0xff870b48; 219 s->reg[IMX31_CCM_PDR1_REG] = 0x49fcfe7f; 220 s->reg[IMX31_CCM_RCSR_REG] = 0x007f0000; 221 s->reg[IMX31_CCM_MPCTL_REG] = 0x04001800; 222 s->reg[IMX31_CCM_UPCTL_REG] = 0x04051c03; 223 s->reg[IMX31_CCM_SPCTL_REG] = 0x04043001; 224 s->reg[IMX31_CCM_COSR_REG] = 0x00000280; 225 s->reg[IMX31_CCM_CGR0_REG] = 0xffffffff; 226 s->reg[IMX31_CCM_CGR1_REG] = 0xffffffff; 227 s->reg[IMX31_CCM_CGR2_REG] = 0xffffffff; 228 s->reg[IMX31_CCM_WIMR_REG] = 0xffffffff; 229 s->reg[IMX31_CCM_LTR1_REG] = 0x00004040; 230 s->reg[IMX31_CCM_PMCR0_REG] = 0x80209828; 231 s->reg[IMX31_CCM_PMCR1_REG] = 0x00aa0000; 232 s->reg[IMX31_CCM_PDR2_REG] = 0x00000285; 233 } 234 235 static uint64_t imx31_ccm_read(void *opaque, hwaddr offset, unsigned size) 236 { 237 uint32_t value = 0; 238 IMX31CCMState *s = (IMX31CCMState *)opaque; 239 240 if ((offset >> 2) < IMX31_CCM_MAX_REG) { 241 value = s->reg[offset >> 2]; 242 } else { 243 qemu_log_mask(LOG_GUEST_ERROR, "[%s]%s: Bad register at offset 0x%" 244 HWADDR_PRIx "\n", TYPE_IMX31_CCM, __func__, offset); 245 } 246 247 DPRINTF("reg[%s] => 0x%" PRIx32 "\n", imx31_ccm_reg_name(offset >> 2), 248 value); 249 250 return (uint64_t)value; 251 } 252 253 static void imx31_ccm_write(void *opaque, hwaddr offset, uint64_t value, 254 unsigned size) 255 { 256 IMX31CCMState *s = (IMX31CCMState *)opaque; 257 258 DPRINTF("reg[%s] <= 0x%" PRIx32 "\n", imx31_ccm_reg_name(offset >> 2), 259 (uint32_t)value); 260 261 switch (offset >> 2) { 262 case IMX31_CCM_CCMR_REG: 263 s->reg[IMX31_CCM_CCMR_REG] = CCMR_FPMF | (value & 0x3b6fdfff); 264 break; 265 case IMX31_CCM_PDR0_REG: 266 s->reg[IMX31_CCM_PDR0_REG] = value & 0xff9f3fff; 267 break; 268 case IMX31_CCM_PDR1_REG: 269 s->reg[IMX31_CCM_PDR1_REG] = value; 270 break; 271 case IMX31_CCM_MPCTL_REG: 272 s->reg[IMX31_CCM_MPCTL_REG] = value & 0xbfff3fff; 273 break; 274 case IMX31_CCM_SPCTL_REG: 275 s->reg[IMX31_CCM_SPCTL_REG] = value & 0xbfff3fff; 276 break; 277 case IMX31_CCM_CGR0_REG: 278 s->reg[IMX31_CCM_CGR0_REG] = value; 279 break; 280 case IMX31_CCM_CGR1_REG: 281 s->reg[IMX31_CCM_CGR1_REG] = value; 282 break; 283 case IMX31_CCM_CGR2_REG: 284 s->reg[IMX31_CCM_CGR2_REG] = value; 285 break; 286 default: 287 qemu_log_mask(LOG_GUEST_ERROR, "[%s]%s: Bad register at offset 0x%" 288 HWADDR_PRIx "\n", TYPE_IMX31_CCM, __func__, offset); 289 break; 290 } 291 } 292 293 static const struct MemoryRegionOps imx31_ccm_ops = { 294 .read = imx31_ccm_read, 295 .write = imx31_ccm_write, 296 .endianness = DEVICE_NATIVE_ENDIAN, 297 .valid = { 298 /* 299 * Our device would not work correctly if the guest was doing 300 * unaligned access. This might not be a limitation on the real 301 * device but in practice there is no reason for a guest to access 302 * this device unaligned. 303 */ 304 .min_access_size = 4, 305 .max_access_size = 4, 306 .unaligned = false, 307 }, 308 309 }; 310 311 static void imx31_ccm_init(Object *obj) 312 { 313 DeviceState *dev = DEVICE(obj); 314 SysBusDevice *sd = SYS_BUS_DEVICE(obj); 315 IMX31CCMState *s = IMX31_CCM(obj); 316 317 memory_region_init_io(&s->iomem, OBJECT(dev), &imx31_ccm_ops, s, 318 TYPE_IMX31_CCM, 0x1000); 319 sysbus_init_mmio(sd, &s->iomem); 320 } 321 322 static void imx31_ccm_class_init(ObjectClass *klass, void *data) 323 { 324 DeviceClass *dc = DEVICE_CLASS(klass); 325 IMXCCMClass *ccm = IMX_CCM_CLASS(klass); 326 327 dc->reset = imx31_ccm_reset; 328 dc->vmsd = &vmstate_imx31_ccm; 329 dc->desc = "i.MX31 Clock Control Module"; 330 331 ccm->get_clock_frequency = imx31_ccm_get_clock_frequency; 332 } 333 334 static const TypeInfo imx31_ccm_info = { 335 .name = TYPE_IMX31_CCM, 336 .parent = TYPE_IMX_CCM, 337 .instance_size = sizeof(IMX31CCMState), 338 .instance_init = imx31_ccm_init, 339 .class_init = imx31_ccm_class_init, 340 }; 341 342 static void imx31_ccm_register_types(void) 343 { 344 type_register_static(&imx31_ccm_info); 345 } 346 347 type_init(imx31_ccm_register_types) 348