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