arch/arm/mach-omap2/am33xx/sys_info.c

   1 /*
   2  * sys_info.c
   3  *
   4  * System information functions
   5  *
   6  * Copyright (C) 2011, Texas Instruments, Incorporated - http://www.ti.com/
   7  *
   8  * Derived from Beagle Board and 3430 SDP code by
   9  *      Richard Woodruff <r-woodruff2@ti.com>
  10  *      Syed Mohammed Khasim <khasim@ti.com>
  11  *
  12  * SPDX-License-Identifier:     GPL-2.0+
  13  */
  14
  15 #include <common.h>
  16 #include <asm/io.h>
  17 #include <asm/arch/sys_proto.h>
  18 #include <asm/arch/cpu.h>
  19 #include <asm/arch/clock.h>
  20 #include <power/tps65910.h>
  21 #include <linux/compiler.h>
  22
  23 struct ctrl_stat *cstat = (struct ctrl_stat *)CTRL_BASE;
  24
  25 /**
  26  * get_cpu_rev(void) - extract rev info
  27  */
  28 u32 get_cpu_rev(void)
  29 {
  30         u32 id;
  31         u32 rev;
  32
  33         id = readl(DEVICE_ID);
  34         rev = (id >> 28) & 0xff;
  35
  36         return rev;
  37 }
  38
  39 /**
  40  * get_cpu_type(void) - extract cpu info
  41  */
  42 u32 get_cpu_type(void)
  43 {
  44         u32 id = 0;
  45         u32 partnum;
  46
  47         id = readl(DEVICE_ID);
  48         partnum = (id >> 12) & 0xffff;
  49
  50         return partnum;
  51 }
  52
  53 /**
  54  * get_device_type(): tell if GP/HS/EMU/TST
  55  */
  56 u32 get_device_type(void)
  57 {
  58         int mode;
  59         mode = readl(&cstat->statusreg) & (DEVICE_MASK);
  60         return mode >>= 8;
  61 }
  62
  63 /**
  64  * get_sysboot_value(void) - return SYS_BOOT[4:0]
  65  */
  66 u32 get_sysboot_value(void)
  67 {
  68         return readl(&cstat->statusreg) & SYSBOOT_MASK;
  69 }
  70
  71 #ifdef CONFIG_DISPLAY_CPUINFO
  72 static char *cpu_revs[] = {
  73                 "1.0",
  74                 "2.0",
  75                 "2.1"};
  76
  77 static char *cpu_revs_am43xx[] = {
  78                 "1.0",
  79                 "1.1",
  80                 "1.2"};
  81
  82 static char *dev_types[] = {
  83                 "TST",
  84                 "EMU",
  85                 "HS",
  86                 "GP"};
  87
  88 /**
  89  * Print CPU information
  90  */
  91 int print_cpuinfo(void)
  92 {
  93         char *cpu_s, *sec_s, *rev_s;
  94         char **cpu_rev_arr = cpu_revs;
  95
  96         switch (get_cpu_type()) {
  97         case AM335X:
  98                 cpu_s = "AM335X";
  99                 break;
 100         case TI81XX:
 101                 cpu_s = "TI81XX";
 102                 break;
 103         case AM437X:
 104                 cpu_s = "AM437X";
 105                 cpu_rev_arr = cpu_revs_am43xx;
 106                 break;
 107         default:
 108                 cpu_s = "Unknown CPU type";
 109                 break;
 110         }
 111
 112         if (get_cpu_rev() < ARRAY_SIZE(cpu_revs))
 113                 rev_s = cpu_rev_arr[get_cpu_rev()];
 114         else
 115                 rev_s = "?";
 116
 117         if (get_device_type() < ARRAY_SIZE(dev_types))
 118                 sec_s = dev_types[get_device_type()];
 119         else
 120                 sec_s = "?";
 121
 122         printf("CPU  : %s-%s rev %s\n", cpu_s, sec_s, rev_s);
 123
 124         return 0;
 125 }
 126 #endif  /* CONFIG_DISPLAY_CPUINFO */
 127
 128 #ifdef CONFIG_AM33XX
 129 int am335x_get_efuse_mpu_max_freq(struct ctrl_dev *cdev)
 130 {
 131         int sil_rev;
 132
 133         sil_rev = readl(&cdev->deviceid) >> 28;
 134
 135         if (sil_rev == 0) {
 136                 /* No efuse in PG 1.0. Use max speed */
 137                 return MPUPLL_M_720;
 138         } else if (sil_rev >= 1) {
 139                 /* Check what the efuse says our max speed is. */
 140                 int efuse_arm_mpu_max_freq, package_type;
 141                 efuse_arm_mpu_max_freq = readl(&cdev->efuse_sma);
 142                 package_type = (efuse_arm_mpu_max_freq & PACKAGE_TYPE_MASK) >>
 143                                 PACKAGE_TYPE_SHIFT;
 144
 145                 /* PG 2.0, efuse may not be set. */
 146                 if (package_type == PACKAGE_TYPE_UNDEFINED || package_type ==
 147                     PACKAGE_TYPE_RESERVED)
 148                         return MPUPLL_M_800;
 149
 150                 switch ((efuse_arm_mpu_max_freq & DEVICE_ID_MASK)) {
 151                 case AM335X_ZCZ_1000:
 152                         return MPUPLL_M_1000;
 153                 case AM335X_ZCZ_800:
 154                         return MPUPLL_M_800;
 155                 case AM335X_ZCZ_720:
 156                         return MPUPLL_M_720;
 157                 case AM335X_ZCZ_600:
 158                 case AM335X_ZCE_600:
 159                         return MPUPLL_M_600;
 160                 case AM335X_ZCZ_300:
 161                 case AM335X_ZCE_300:
 162                         return MPUPLL_M_300;
 163                 }
 164         }
 165
 166         /* unknown, use the PG1.0 max */
 167         return MPUPLL_M_720;
 168 }
 169
 170 int am335x_get_tps65910_mpu_vdd(int sil_rev, int frequency)
 171 {
 172         /* For PG2.0 and later, we have one set of values. */
 173         if (sil_rev >= 1) {
 174                 switch (frequency) {
 175                 case MPUPLL_M_1000:
 176                         return TPS65910_OP_REG_SEL_1_3_2_5;
 177                 case MPUPLL_M_800:
 178                         return TPS65910_OP_REG_SEL_1_2_6;
 179                 case MPUPLL_M_720:
 180                         return TPS65910_OP_REG_SEL_1_2_0;
 181                 case MPUPLL_M_600:
 182                 case MPUPLL_M_500:
 183                 case MPUPLL_M_300:
 184                         return TPS65910_OP_REG_SEL_1_1_0;
 185                 }
 186         }
 187
 188         /* Default to PG1.0 values. */
 189         return TPS65910_OP_REG_SEL_1_2_6;
 190 }
 191 #endif