board/qualcomm/dragonboard820c/dragonboard820c.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Board init file for Dragonboard 820C
   4  *
   5  * (C) Copyright 2017 Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>
   6  */
   7
   8 #include <cpu_func.h>
   9 #include <init.h>
  10 #include <asm/arch/sysmap-apq8096.h>
  11 #include <env.h>
  12 #include <asm/cache.h>
  13 #include <linux/arm-smccc.h>
  14 #include <linux/psci.h>
  15 #include <common.h>
  16 #include <dm.h>
  17 #include <asm/io.h>
  18 #include <linux/bitops.h>
  19 #include <asm/psci.h>
  20 #include <asm/gpio.h>
  21
  22 DECLARE_GLOBAL_DATA_PTR;
  23
  24 int dram_init(void)
  25 {
  26         gd->ram_size = PHYS_SDRAM_SIZE;
  27
  28         return 0;
  29 }
  30
  31 int dram_init_banksize(void)
  32 {
  33         gd->bd->bi_dram[0].start = PHYS_SDRAM_1;
  34         gd->bd->bi_dram[0].size = PHYS_SDRAM_1_SIZE;
  35
  36         gd->bd->bi_dram[1].start = PHYS_SDRAM_2;
  37         gd->bd->bi_dram[1].size  = PHYS_SDRAM_2_SIZE;
  38
  39         return 0;
  40 }
  41
  42 static void sdhci_power_init(void)
  43 {
  44         const u32 TLMM_PULL_MASK = 0x3;
  45         const u32 TLMM_HDRV_MASK = 0x7;
  46
  47         struct tlmm_cfg {
  48                 u32 bit;  /* bit in the register      */
  49                 u8 mask;  /* mask clk/dat/cmd control */
  50                 u8 val;
  51         };
  52
  53         /* bit offsets in the sdc tlmm register */
  54         enum {  SDC1_DATA_HDRV = 0,
  55                 SDC1_CMD_HDRV  = 3,
  56                 SDC1_CLK_HDRV  = 6,
  57                 SDC1_DATA_PULL = 9,
  58                 SDC1_CMD_PULL  = 11,
  59                 SDC1_CLK_PULL  = 13,
  60                 SDC1_RCLK_PULL = 15,
  61         };
  62
  63         enum {  TLMM_PULL_DOWN   = 0x1,
  64                 TLMM_PULL_UP   = 0x3,
  65                 TLMM_NO_PULL   = 0x0,
  66         };
  67
  68         enum {  TLMM_CUR_VAL_10MA = 0x04,
  69                 TLMM_CUR_VAL_16MA = 0x07,
  70         };
  71         int i;
  72
  73         /* drive strength configs for sdhc pins */
  74         const struct tlmm_cfg hdrv[] = {
  75
  76                 { SDC1_CLK_HDRV,  TLMM_CUR_VAL_16MA, TLMM_HDRV_MASK, },
  77                 { SDC1_CMD_HDRV,  TLMM_CUR_VAL_10MA, TLMM_HDRV_MASK, },
  78                 { SDC1_DATA_HDRV, TLMM_CUR_VAL_10MA, TLMM_HDRV_MASK, },
  79         };
  80
  81         /* pull configs for sdhc pins */
  82         const struct tlmm_cfg pull[] = {
  83
  84                 { SDC1_CLK_PULL,  TLMM_NO_PULL, TLMM_PULL_MASK, },
  85                 { SDC1_CMD_PULL,  TLMM_PULL_UP, TLMM_PULL_MASK, },
  86                 { SDC1_DATA_PULL, TLMM_PULL_UP, TLMM_PULL_MASK, },
  87         };
  88
  89         const struct tlmm_cfg rclk[] = {
  90
  91                 { SDC1_RCLK_PULL, TLMM_PULL_DOWN, TLMM_PULL_MASK,},
  92         };
  93
  94         for (i = 0; i < ARRAY_SIZE(hdrv); i++)
  95                 clrsetbits_le32(SDC1_HDRV_PULL_CTL_REG,
  96                                 hdrv[i].mask << hdrv[i].bit,
  97                         hdrv[i].val  << hdrv[i].bit);
  98
  99         for (i = 0; i < ARRAY_SIZE(pull); i++)
 100                 clrsetbits_le32(SDC1_HDRV_PULL_CTL_REG,
 101                                 pull[i].mask << pull[i].bit,
 102                         pull[i].val  << pull[i].bit);
 103
 104         for (i = 0; i < ARRAY_SIZE(rclk); i++)
 105                 clrsetbits_le32(SDC1_HDRV_PULL_CTL_REG,
 106                                 rclk[i].mask << rclk[i].bit,
 107                         rclk[i].val  << rclk[i].bit);
 108 }
 109
 110 static void show_psci_version(void)
 111 {
 112         struct arm_smccc_res res;
 113
 114         arm_smccc_smc(ARM_PSCI_0_2_FN_PSCI_VERSION, 0, 0, 0, 0, 0, 0, 0, &res);
 115
 116         printf("PSCI:  v%ld.%ld\n",
 117                PSCI_VERSION_MAJOR(res.a0),
 118                 PSCI_VERSION_MINOR(res.a0));
 119 }
 120
 121 int board_init(void)
 122 {
 123         sdhci_power_init();
 124         show_psci_version();
 125
 126         return 0;
 127 }
 128
 129 void reset_cpu(ulong addr)
 130 {
 131         psci_system_reset();
 132 }
 133
 134 /* Check for vol- button - if pressed - stop autoboot */
 135 int misc_init_r(void)
 136 {
 137         struct udevice *pon;
 138         struct gpio_desc resin;
 139         int node, ret;
 140
 141         ret = uclass_get_device_by_name(UCLASS_GPIO, "pm8994_pon@800", &pon);
 142         if (ret < 0) {
 143                 printf("Failed to find PMIC pon node. Check device tree\n");
 144                 return 0;
 145         }
 146
 147         node = fdt_subnode_offset(gd->fdt_blob, dev_of_offset(pon),
 148                                   "key_vol_down");
 149         if (node < 0) {
 150                 printf("Failed to find key_vol_down node. Check device tree\n");
 151                 return 0;
 152         }
 153
 154         if (gpio_request_by_name_nodev(offset_to_ofnode(node), "gpios", 0,
 155                                        &resin, 0)) {
 156                 printf("Failed to request key_vol_down button.\n");
 157                 return 0;
 158         }
 159
 160         if (dm_gpio_get_value(&resin)) {
 161                 env_set("bootdelay", "-1");
 162                 printf("Power button pressed - dropping to console.\n");
 163         }
 164
 165         return 0;
 166 }