board/highbank/highbank.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright 2010-2011 Calxeda, Inc.
   4  */
   5
   6 #include <common.h>
   7 #include <ahci.h>
   8 #include <cpu_func.h>
   9 #include <env.h>
  10 #include <fdt_support.h>
  11 #include <fdtdec.h>
  12 #include <init.h>
  13 #include <net.h>
  14 #include <scsi.h>
  15 #include <asm/global_data.h>
  16
  17 #include <linux/sizes.h>
  18 #include <asm/io.h>
  19
  20 #define HB_AHCI_BASE                    0xffe08000
  21
  22 #define HB_SCU_A9_PWR_STATUS            0xfff10008
  23 #define HB_SREG_A9_PWR_REQ              0xfff3cf00
  24 #define HB_SREG_A9_BOOT_SRC_STAT        0xfff3cf04
  25 #define HB_SREG_A9_PWRDOM_STAT          0xfff3cf20
  26 #define HB_SREG_A15_PWR_CTRL            0xfff3c200
  27
  28 #define HB_PWR_SUSPEND                  0
  29 #define HB_PWR_SOFT_RESET               1
  30 #define HB_PWR_HARD_RESET               2
  31 #define HB_PWR_SHUTDOWN                 3
  32
  33 #define PWRDOM_STAT_SATA                0x80000000
  34 #define PWRDOM_STAT_PCI                 0x40000000
  35 #define PWRDOM_STAT_EMMC                0x20000000
  36
  37 #define HB_SCU_A9_PWR_NORMAL            0
  38 #define HB_SCU_A9_PWR_DORMANT           2
  39 #define HB_SCU_A9_PWR_OFF               3
  40
  41 DECLARE_GLOBAL_DATA_PTR;
  42
  43 void cphy_disable_overrides(void);
  44
  45 /*
  46  * Miscellaneous platform dependent initialisations
  47  */
  48 int board_init(void)
  49 {
  50         icache_enable();
  51
  52         return 0;
  53 }
  54
  55 #ifdef CONFIG_SCSI_AHCI_PLAT
  56 void scsi_init(void)
  57 {
  58         u32 reg = readl(HB_SREG_A9_PWRDOM_STAT);
  59
  60         cphy_disable_overrides();
  61         if (reg & PWRDOM_STAT_SATA) {
  62                 ahci_init((void __iomem *)HB_AHCI_BASE);
  63                 scsi_scan(true);
  64         }
  65 }
  66 #endif
  67
  68 #ifdef CONFIG_MISC_INIT_R
  69 int misc_init_r(void)
  70 {
  71         char envbuffer[16];
  72         u32 boot_choice;
  73
  74         boot_choice = readl(HB_SREG_A9_BOOT_SRC_STAT) & 0xff;
  75         sprintf(envbuffer, "bootcmd%d", boot_choice);
  76         if (env_get(envbuffer)) {
  77                 sprintf(envbuffer, "run bootcmd%d", boot_choice);
  78                 env_set("bootcmd", envbuffer);
  79         } else
  80                 env_set("bootcmd", "");
  81
  82         return 0;
  83 }
  84 #endif
  85
  86 int dram_init(void)
  87 {
  88         return fdtdec_setup_mem_size_base();
  89 }
  90
  91 int dram_init_banksize(void)
  92 {
  93         return fdtdec_setup_memory_banksize();
  94 }
  95
  96 #if defined(CONFIG_OF_BOARD_SETUP)
  97 int ft_board_setup(void *fdt, struct bd_info *bd)
  98 {
  99         static const char disabled[] = "disabled";
 100         u32 reg = readl(HB_SREG_A9_PWRDOM_STAT);
 101
 102         if (!(reg & PWRDOM_STAT_SATA))
 103                 do_fixup_by_compat(fdt, "calxeda,hb-ahci", "status",
 104                         disabled, sizeof(disabled), 1);
 105
 106         if (!(reg & PWRDOM_STAT_EMMC))
 107                 do_fixup_by_compat(fdt, "calxeda,hb-sdhci", "status",
 108                         disabled, sizeof(disabled), 1);
 109
 110         return 0;
 111 }
 112 #endif
 113
 114 void *board_fdt_blob_setup(int *err)
 115 {
 116         *err = 0;
 117         /*
 118          * The ECME management processor loads the DTB from NOR flash
 119          * into DRAM (at 4KB), where it gets patched to contain the
 120          * detected memory size.
 121          */
 122         return (void *)0x1000;
 123 }
 124
 125 static int is_highbank(void)
 126 {
 127         uint32_t midr;
 128
 129         asm volatile ("mrc p15, 0, %0, c0, c0, 0\n" : "=r"(midr));
 130
 131         return (midr & 0xfff0) == 0xc090;
 132 }
 133
 134 void reset_cpu(void)
 135 {
 136         writel(HB_PWR_HARD_RESET, HB_SREG_A9_PWR_REQ);
 137         if (is_highbank())
 138                 writeb(HB_SCU_A9_PWR_OFF, HB_SCU_A9_PWR_STATUS);
 139         else
 140                 writel(0x1, HB_SREG_A15_PWR_CTRL);
 141
 142         wfi();
 143 }
 144
 145 /*
 146  * turn off the override before transferring control to Linux, since Linux
 147  * may not support spread spectrum.
 148  */
 149 void arch_preboot_os(void)
 150 {
 151         cphy_disable_overrides();
 152 }