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