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