board/broadcom/bcmstb/bcmstb.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2018  Cisco Systems, Inc.
   4  *
   5  * Author: Thomas Fitzsimmons <fitzsim@fitzsim.org>
   6  */
   7
   8 #include <linux/types.h>
   9 #include <common.h>
  10 #include <asm/io.h>
  11 #include <asm/bootm.h>
  12 #include <mach/sdhci.h>
  13 #include <mach/timer.h>
  14 #include <mmc.h>
  15 #include <fdtdec.h>
  16
  17 DECLARE_GLOBAL_DATA_PTR;
  18
  19 #define BCMSTB_DATA_SECTION __attribute__((section(".data")))
  20
  21 struct bcmstb_boot_parameters bcmstb_boot_parameters BCMSTB_DATA_SECTION;
  22
  23 phys_addr_t prior_stage_fdt_address BCMSTB_DATA_SECTION;
  24
  25 union reg_value_union {
  26         const char *data;
  27         const phys_addr_t *address;
  28 };
  29
  30 int board_init(void)
  31 {
  32         return 0;
  33 }
  34
  35 u32 get_board_rev(void)
  36 {
  37         return 0;
  38 }
  39
  40 void reset_cpu(ulong ignored)
  41 {
  42 }
  43
  44 int print_cpuinfo(void)
  45 {
  46         return 0;
  47 }
  48
  49 int dram_init(void)
  50 {
  51         if (fdtdec_setup_memory_size() != 0)
  52                 return -EINVAL;
  53
  54         return 0;
  55 }
  56
  57 int dram_init_banksize(void)
  58 {
  59         fdtdec_setup_memory_banksize();
  60
  61         /*
  62          * On this SoC, U-Boot is running as an ELF file.  Change the
  63          * relocation address to CONFIG_SYS_TEXT_BASE, so that in
  64          * setup_reloc, gd->reloc_off works out to 0, effectively
  65          * disabling relocation.  Otherwise U-Boot hangs in the setup
  66          * instructions just before relocate_code in
  67          * arch/arm/lib/crt0.S.
  68          */
  69         gd->relocaddr = CONFIG_SYS_TEXT_BASE;
  70
  71         return 0;
  72 }
  73
  74 void enable_caches(void)
  75 {
  76         /*
  77          * This port assumes that the prior stage bootloader has
  78          * enabled I-cache and D-cache already.  Implementing this
  79          * function silences the warning in the default function.
  80          */
  81 }
  82
  83 static const phys_addr_t bcmstb_sdhci_address(u32 alias_index)
  84 {
  85         int node = 0;
  86         int ret = 0;
  87         char sdhci[16] = { 0 };
  88         const void *fdt = gd->fdt_blob;
  89         const char *path = NULL;
  90         struct fdt_resource resource = { 0 };
  91
  92         if (!fdt) {
  93                 printf("%s: Invalid gd->fdt_blob\n", __func__);
  94                 return 0;
  95         }
  96
  97         node = fdt_path_offset(fdt, "/aliases");
  98         if (node < 0) {
  99                 printf("%s: Failed to find /aliases node\n", __func__);
 100                 return 0;
 101         }
 102
 103         sprintf(sdhci, "sdhci%d", alias_index);
 104         path = fdt_getprop(fdt, node, sdhci, NULL);
 105         if (!path) {
 106                 printf("%s: Failed to find alias for %s\n", __func__, sdhci);
 107                 return 0;
 108         }
 109
 110         node = fdt_path_offset(fdt, path);
 111         if (node < 0) {
 112                 printf("%s: Failed to resolve BCMSTB SDHCI alias\n", __func__);
 113                 return 0;
 114         }
 115
 116         ret = fdt_get_named_resource(fdt, node, "reg", "reg-names",
 117                                      "host", &resource);
 118         if (ret) {
 119                 printf("%s: Failed to read BCMSTB SDHCI host resource\n",
 120                        __func__);
 121                 return 0;
 122         }
 123
 124         return resource.start;
 125 }
 126
 127 int board_mmc_init(bd_t *bis)
 128 {
 129         phys_addr_t sdhci_base_address = 0;
 130
 131         sdhci_base_address = bcmstb_sdhci_address(CONFIG_BCMSTB_SDHCI_INDEX);
 132
 133         if (!sdhci_base_address) {
 134                 sdhci_base_address = BCMSTB_SDHCI_BASE;
 135                 printf("%s: Assuming BCMSTB SDHCI address: 0x%p\n",
 136                        __func__, (void *)sdhci_base_address);
 137         }
 138
 139         debug("BCMSTB SDHCI base address: 0x%p\n", (void *)sdhci_base_address);
 140
 141         bcmstb_sdhci_init(sdhci_base_address);
 142
 143         return 0;
 144 }
 145
 146 int timer_init(void)
 147 {
 148         gd->arch.timer_rate_hz = readl(BCMSTB_TIMER_FREQUENCY);
 149
 150         return 0;
 151 }
 152
 153 ulong get_tbclk(void)
 154 {
 155         return gd->arch.timer_rate_hz;
 156 }
 157
 158 uint64_t get_ticks(void)
 159 {
 160         gd->timebase_h = readl(BCMSTB_TIMER_HIGH);
 161         gd->timebase_l = readl(BCMSTB_TIMER_LOW);
 162
 163         return ((uint64_t)gd->timebase_h << 32) | gd->timebase_l;
 164 }
 165
 166 int board_late_init(void)
 167 {
 168         debug("Arguments from prior stage bootloader:\n");
 169         debug("General Purpose Register 0: 0x%x\n", bcmstb_boot_parameters.r0);
 170         debug("General Purpose Register 1: 0x%x\n", bcmstb_boot_parameters.r1);
 171         debug("General Purpose Register 2: 0x%x\n", bcmstb_boot_parameters.r2);
 172         debug("General Purpose Register 3: 0x%x\n", bcmstb_boot_parameters.r3);
 173         debug("Stack Pointer Register:     0x%x\n", bcmstb_boot_parameters.sp);
 174         debug("Link Register:              0x%x\n", bcmstb_boot_parameters.lr);
 175         debug("Assuming timer frequency register at: 0x%p\n",
 176               (void *)BCMSTB_TIMER_FREQUENCY);
 177         debug("Read timer frequency (in Hz): %ld\n", gd->arch.timer_rate_hz);
 178         debug("Prior stage provided DTB at: 0x%p\n",
 179               (void *)prior_stage_fdt_address);
 180
 181         /*
 182          * Set fdtcontroladdr in the environment so that scripts can
 183          * refer to it, for example, to reuse it for fdtaddr.
 184          */
 185         env_set_hex("fdtcontroladdr", prior_stage_fdt_address);
 186
 187         /*
 188          * Do not set machid to the machine identifier value provided
 189          * by the prior stage bootloader (bcmstb_boot_parameters.r1)
 190          * because we're using a device tree to boot Linux.
 191          */
 192
 193         return 0;
 194 }