drivers/cpu/imx8_cpu.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright 2019 NXP
   4  */
   5
   6 #include <common.h>
   7 #include <cpu.h>
   8 #include <dm.h>
   9 #include <thermal.h>
  10 #include <asm/arch/sci/sci.h>
  11 #include <asm/arch/sys_proto.h>
  12 #include <asm/arch-imx/cpu.h>
  13 #include <asm/armv8/cpu.h>
  14
  15 DECLARE_GLOBAL_DATA_PTR;
  16
  17 struct cpu_imx_platdata {
  18         const char *name;
  19         const char *rev;
  20         const char *type;
  21         u32 cpurev;
  22         u32 freq_mhz;
  23         u32 mpidr;
  24 };
  25
  26 const char *get_imx8_type(u32 imxtype)
  27 {
  28         switch (imxtype) {
  29         case MXC_CPU_IMX8QXP:
  30         case MXC_CPU_IMX8QXP_A0:
  31                 return "QXP";
  32         case MXC_CPU_IMX8QM:
  33                 return "QM";
  34         default:
  35                 return "??";
  36         }
  37 }
  38
  39 const char *get_imx8_rev(u32 rev)
  40 {
  41         switch (rev) {
  42         case CHIP_REV_A:
  43                 return "A";
  44         case CHIP_REV_B:
  45                 return "B";
  46         default:
  47                 return "?";
  48         }
  49 }
  50
  51 const char *get_core_name(void)
  52 {
  53         if (is_cortex_a35())
  54                 return "A35";
  55         else if (is_cortex_a53())
  56                 return "A53";
  57         else if (is_cortex_a72())
  58                 return "A72";
  59         else
  60                 return "?";
  61 }
  62
  63 #if IS_ENABLED(CONFIG_IMX_SCU_THERMAL)
  64 static int cpu_imx_get_temp(void)
  65 {
  66         struct udevice *thermal_dev;
  67         int cpu_tmp, ret;
  68
  69         ret = uclass_get_device_by_name(UCLASS_THERMAL, "cpu-thermal0",
  70                                         &thermal_dev);
  71
  72         if (!ret) {
  73                 ret = thermal_get_temp(thermal_dev, &cpu_tmp);
  74                 if (ret)
  75                         return 0xdeadbeef;
  76         } else {
  77                 return 0xdeadbeef;
  78         }
  79
  80         return cpu_tmp;
  81 }
  82 #else
  83 static int cpu_imx_get_temp(void)
  84 {
  85         return 0;
  86 }
  87 #endif
  88
  89 int cpu_imx_get_desc(struct udevice *dev, char *buf, int size)
  90 {
  91         struct cpu_imx_platdata *plat = dev_get_platdata(dev);
  92         int ret;
  93
  94         if (size < 100)
  95                 return -ENOSPC;
  96
  97         ret = snprintf(buf, size, "NXP i.MX8%s Rev%s %s at %u MHz",
  98                        plat->type, plat->rev, plat->name, plat->freq_mhz);
  99
 100         if (IS_ENABLED(CONFIG_IMX_SCU_THERMAL)) {
 101                 buf = buf + ret;
 102                 size = size - ret;
 103                 ret = snprintf(buf, size, " at %dC", cpu_imx_get_temp());
 104         }
 105
 106         snprintf(buf + ret, size - ret, "\n");
 107
 108         return 0;
 109 }
 110
 111 static int cpu_imx_get_info(struct udevice *dev, struct cpu_info *info)
 112 {
 113         struct cpu_imx_platdata *plat = dev_get_platdata(dev);
 114
 115         info->cpu_freq = plat->freq_mhz * 1000;
 116         info->features = BIT(CPU_FEAT_L1_CACHE) | BIT(CPU_FEAT_MMU);
 117         return 0;
 118 }
 119
 120 static int cpu_imx_get_count(struct udevice *dev)
 121 {
 122         ofnode node;
 123         int num = 0;
 124
 125         ofnode_for_each_subnode(node, dev_ofnode(dev->parent)) {
 126                 const char *device_type;
 127
 128                 if (!ofnode_is_available(node))
 129                         continue;
 130
 131                 device_type = ofnode_read_string(node, "device_type");
 132                 if (!device_type)
 133                         continue;
 134
 135                 if (!strcmp(device_type, "cpu"))
 136                         num++;
 137         }
 138
 139         return num;
 140 }
 141
 142 static int cpu_imx_get_vendor(struct udevice *dev,  char *buf, int size)
 143 {
 144         snprintf(buf, size, "NXP");
 145         return 0;
 146 }
 147
 148 static int cpu_imx_is_current(struct udevice *dev)
 149 {
 150         struct cpu_imx_platdata *plat = dev_get_platdata(dev);
 151
 152         if (plat->mpidr == (read_mpidr() & 0xffff))
 153                 return 1;
 154
 155         return 0;
 156 }
 157
 158 static const struct cpu_ops cpu_imx8_ops = {
 159         .get_desc       = cpu_imx_get_desc,
 160         .get_info       = cpu_imx_get_info,
 161         .get_count      = cpu_imx_get_count,
 162         .get_vendor     = cpu_imx_get_vendor,
 163         .is_current     = cpu_imx_is_current,
 164 };
 165
 166 static const struct udevice_id cpu_imx8_ids[] = {
 167         { .compatible = "arm,cortex-a35" },
 168         { .compatible = "arm,cortex-a53" },
 169         { .compatible = "arm,cortex-a72" },
 170         { }
 171 };
 172
 173 static ulong imx8_get_cpu_rate(void)
 174 {
 175         ulong rate;
 176         int ret;
 177         int type = is_cortex_a35() ? SC_R_A35 : is_cortex_a53() ?
 178                    SC_R_A53 : SC_R_A72;
 179
 180         ret = sc_pm_get_clock_rate(-1, type, SC_PM_CLK_CPU,
 181                                    (sc_pm_clock_rate_t *)&rate);
 182         if (ret) {
 183                 printf("Could not read CPU frequency: %d\n", ret);
 184                 return 0;
 185         }
 186
 187         return rate;
 188 }
 189
 190 static int imx8_cpu_probe(struct udevice *dev)
 191 {
 192         struct cpu_imx_platdata *plat = dev_get_platdata(dev);
 193         u32 cpurev;
 194
 195         cpurev = get_cpu_rev();
 196         plat->cpurev = cpurev;
 197         plat->name = get_core_name();
 198         plat->rev = get_imx8_rev(cpurev & 0xFFF);
 199         plat->type = get_imx8_type((cpurev & 0xFF000) >> 12);
 200         plat->freq_mhz = imx8_get_cpu_rate() / 1000000;
 201         plat->mpidr = dev_read_addr(dev);
 202         if (plat->mpidr == FDT_ADDR_T_NONE) {
 203                 printf("%s: Failed to get CPU reg property\n", __func__);
 204                 return -EINVAL;
 205         }
 206
 207         return 0;
 208 }
 209
 210 U_BOOT_DRIVER(cpu_imx8_drv) = {
 211         .name           = "imx8x_cpu",
 212         .id             = UCLASS_CPU,
 213         .of_match       = cpu_imx8_ids,
 214         .ops            = &cpu_imx8_ops,
 215         .probe          = imx8_cpu_probe,
 216         .platdata_auto_alloc_size = sizeof(struct cpu_imx_platdata),
 217         .flags          = DM_FLAG_PRE_RELOC,
 218 };