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