hw/misc/imx31_ccm.c

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