arch/arm/mach-omap2/hwinit-common.c

   1 /*
   2  *
   3  * Common functions for OMAP4/5 based boards
   4  *
   5  * (C) Copyright 2010
   6  * Texas Instruments, <www.ti.com>
   7  *
   8  * Author :
   9  *      Aneesh V        <aneesh@ti.com>
  10  *      Steve Sakoman   <steve@sakoman.com>
  11  *
  12  * SPDX-License-Identifier:     GPL-2.0+
  13  */
  14 #include <common.h>
  15 #include <spl.h>
  16 #include <asm/arch/sys_proto.h>
  17 #include <linux/sizes.h>
  18 #include <asm/emif.h>
  19 #include <asm/omap_common.h>
  20 #include <linux/compiler.h>
  21 #include <asm/system.h>
  22
  23 DECLARE_GLOBAL_DATA_PTR;
  24
  25 void do_set_mux(u32 base, struct pad_conf_entry const *array, int size)
  26 {
  27         int i;
  28         struct pad_conf_entry *pad = (struct pad_conf_entry *) array;
  29
  30         for (i = 0; i < size; i++, pad++)
  31                 writew(pad->val, base + pad->offset);
  32 }
  33
  34 static void set_mux_conf_regs(void)
  35 {
  36         switch (omap_hw_init_context()) {
  37         case OMAP_INIT_CONTEXT_SPL:
  38                 set_muxconf_regs();
  39                 break;
  40         case OMAP_INIT_CONTEXT_UBOOT_AFTER_SPL:
  41                 break;
  42         case OMAP_INIT_CONTEXT_UBOOT_FROM_NOR:
  43         case OMAP_INIT_CONTEXT_UBOOT_AFTER_CH:
  44                 set_muxconf_regs();
  45                 break;
  46         }
  47 }
  48
  49 u32 cortex_rev(void)
  50 {
  51
  52         unsigned int rev;
  53
  54         /* Read Main ID Register (MIDR) */
  55         asm ("mrc p15, 0, %0, c0, c0, 0" : "=r" (rev));
  56
  57         return rev;
  58 }
  59
  60 static void omap_rev_string(void)
  61 {
  62         u32 omap_rev = omap_revision();
  63         u32 soc_variant = (omap_rev & 0xF0000000) >> 28;
  64         u32 omap_variant = (omap_rev & 0xFFFF0000) >> 16;
  65         u32 major_rev = (omap_rev & 0x00000F00) >> 8;
  66         u32 minor_rev = (omap_rev & 0x000000F0) >> 4;
  67
  68         const char *sec_s;
  69
  70         switch (get_device_type()) {
  71         case TST_DEVICE:
  72                 sec_s = "TST";
  73                 break;
  74         case EMU_DEVICE:
  75                 sec_s = "EMU";
  76                 break;
  77         case HS_DEVICE:
  78                 sec_s = "HS";
  79                 break;
  80         case GP_DEVICE:
  81                 sec_s = "GP";
  82                 break;
  83         default:
  84                 sec_s = "?";
  85         }
  86
  87         if (soc_variant)
  88                 printf("OMAP");
  89         else
  90                 printf("DRA");
  91         printf("%x-%s ES%x.%x\n", omap_variant, sec_s, major_rev, minor_rev);
  92 }
  93
  94 #ifdef CONFIG_SPL_BUILD
  95 void spl_display_print(void)
  96 {
  97         omap_rev_string();
  98 }
  99 #endif
 100
 101 void __weak srcomp_enable(void)
 102 {
 103 }
 104
 105 /**
 106  * do_board_detect() - Detect board description
 107  *
 108  * Function to detect board description. This is expected to be
 109  * overridden in the SoC family board file where desired.
 110  */
 111 void __weak do_board_detect(void)
 112 {
 113 }
 114
 115 /**
 116  * vcores_init() - Assign omap_vcores based on board
 117  *
 118  * Function to pick the vcores based on board. This is expected to be
 119  * overridden in the SoC family board file where desired.
 120  */
 121 void __weak vcores_init(void)
 122 {
 123 }
 124
 125 void s_init(void)
 126 {
 127 }
 128
 129 /**
 130  * early_system_init - Does Early system initialization.
 131  *
 132  * Does early system init of watchdog, muxing,  andclocks
 133  * Watchdog disable is done always. For the rest what gets done
 134  * depends on the boot mode in which this function is executed when
 135  *   1. SPL running from SRAM
 136  *   2. U-Boot running from FLASH
 137  *   3. U-Boot loaded to SDRAM by SPL
 138  *   4. U-Boot loaded to SDRAM by ROM code using the
 139  *      Configuration Header feature
 140  * Please have a look at the respective functions to see what gets
 141  * done in each of these cases
 142  * This function is called with SRAM stack.
 143  */
 144 void early_system_init(void)
 145 {
 146         init_omap_revision();
 147         hw_data_init();
 148
 149 #ifdef CONFIG_SPL_BUILD
 150         if (warm_reset())
 151                 force_emif_self_refresh();
 152 #endif
 153         watchdog_init();
 154         set_mux_conf_regs();
 155 #ifdef CONFIG_SPL_BUILD
 156         srcomp_enable();
 157         do_io_settings();
 158 #endif
 159         setup_early_clocks();
 160         do_board_detect();
 161         vcores_init();
 162         prcm_init();
 163 }
 164
 165 #ifdef CONFIG_SPL_BUILD
 166 void board_init_f(ulong dummy)
 167 {
 168         early_system_init();
 169 #ifdef CONFIG_BOARD_EARLY_INIT_F
 170         board_early_init_f();
 171 #endif
 172         /* For regular u-boot sdram_init() is called from dram_init() */
 173         sdram_init();
 174         gd->ram_size = omap_sdram_size();
 175 }
 176 #endif
 177
 178 int arch_cpu_init_dm(void)
 179 {
 180         early_system_init();
 181         return 0;
 182 }
 183
 184 /*
 185  * Routine: wait_for_command_complete
 186  * Description: Wait for posting to finish on watchdog
 187  */
 188 void wait_for_command_complete(struct watchdog *wd_base)
 189 {
 190         int pending = 1;
 191         do {
 192                 pending = readl(&wd_base->wwps);
 193         } while (pending);
 194 }
 195
 196 /*
 197  * Routine: watchdog_init
 198  * Description: Shut down watch dogs
 199  */
 200 void watchdog_init(void)
 201 {
 202         struct watchdog *wd2_base = (struct watchdog *)WDT2_BASE;
 203
 204         writel(WD_UNLOCK1, &wd2_base->wspr);
 205         wait_for_command_complete(wd2_base);
 206         writel(WD_UNLOCK2, &wd2_base->wspr);
 207 }
 208
 209
 210 /*
 211  * This function finds the SDRAM size available in the system
 212  * based on DMM section configurations
 213  * This is needed because the size of memory installed may be
 214  * different on different versions of the board
 215  */
 216 u32 omap_sdram_size(void)
 217 {
 218         u32 section, i, valid;
 219         u64 sdram_start = 0, sdram_end = 0, addr,
 220             size, total_size = 0, trap_size = 0, trap_start = 0;
 221
 222         for (i = 0; i < 4; i++) {
 223                 section = __raw_readl(DMM_BASE + i*4);
 224                 valid = (section & EMIF_SDRC_ADDRSPC_MASK) >>
 225                         (EMIF_SDRC_ADDRSPC_SHIFT);
 226                 addr = section & EMIF_SYS_ADDR_MASK;
 227
 228                 /* See if the address is valid */
 229                 if ((addr >= TI_ARMV7_DRAM_ADDR_SPACE_START) &&
 230                     (addr < TI_ARMV7_DRAM_ADDR_SPACE_END)) {
 231                         size = ((section & EMIF_SYS_SIZE_MASK) >>
 232                                    EMIF_SYS_SIZE_SHIFT);
 233                         size = 1 << size;
 234                         size *= SZ_16M;
 235
 236                         if (valid != DMM_SDRC_ADDR_SPC_INVALID) {
 237                                 if (!sdram_start || (addr < sdram_start))
 238                                         sdram_start = addr;
 239                                 if (!sdram_end || ((addr + size) > sdram_end))
 240                                         sdram_end = addr + size;
 241                         } else {
 242                                 trap_size = size;
 243                                 trap_start = addr;
 244                         }
 245                 }
 246         }
 247
 248         if ((trap_start >= sdram_start) && (trap_start < sdram_end))
 249                 total_size = (sdram_end - sdram_start) - (trap_size);
 250         else
 251                 total_size = sdram_end - sdram_start;
 252
 253         return total_size;
 254 }
 255
 256
 257 /*
 258  * Routine: dram_init
 259  * Description: sets uboots idea of sdram size
 260  */
 261 int dram_init(void)
 262 {
 263         sdram_init();
 264         gd->ram_size = omap_sdram_size();
 265         return 0;
 266 }
 267
 268 /*
 269  * Print board information
 270  */
 271 int checkboard(void)
 272 {
 273         puts(sysinfo.board_string);
 274         return 0;
 275 }
 276
 277 /*
 278  *  get_device_type(): tell if GP/HS/EMU/TST
 279  */
 280 u32 get_device_type(void)
 281 {
 282         return (readl((*ctrl)->control_status) &
 283                                       (DEVICE_TYPE_MASK)) >> DEVICE_TYPE_SHIFT;
 284 }
 285
 286 #if defined(CONFIG_DISPLAY_CPUINFO)
 287 /*
 288  * Print CPU information
 289  */
 290 int print_cpuinfo(void)
 291 {
 292         puts("CPU  : ");
 293         omap_rev_string();
 294
 295         return 0;
 296 }
 297 #endif