board/cirrus/edb93xx/edb93xx.c

   1 /*
   2  * Board initialization for EP93xx
   3  *
   4  * Copyright (C) 2013
   5  * Sergey Kostanbaev <sergey.kostanbaev <at> fairwaves.ru>
   6  *
   7  * Copyright (C) 2009
   8  * Matthias Kaehlcke <matthias <at> kaehlcke.net>
   9  *
  10  * (C) Copyright 2002 2003
  11  * Network Audio Technologies, Inc. <www.netaudiotech.com>
  12  * Adam Bezanson <bezanson <at> netaudiotech.com>
  13  *
  14  * SPDX-License-Identifier:     GPL-2.0+
  15  */
  16
  17 #include <config.h>
  18 #include <common.h>
  19 #include <netdev.h>
  20 #include <asm/io.h>
  21 #include <asm/arch/ep93xx.h>
  22
  23 DECLARE_GLOBAL_DATA_PTR;
  24
  25 /*
  26  * usb_div: 4, nbyp2: 1, pll2_en: 1
  27  * pll2_x1: 368640000.000000, pll2_x2ip: 15360000.000000,
  28  * pll2_x2: 384000000.000000, pll2_out: 192000000.000000
  29  */
  30 #define CLKSET2_VAL     (23 << SYSCON_CLKSET_PLL_X2IPD_SHIFT |  \
  31                         24 << SYSCON_CLKSET_PLL_X2FBD2_SHIFT |  \
  32                         24 << SYSCON_CLKSET_PLL_X1FBD1_SHIFT |  \
  33                         1 << SYSCON_CLKSET_PLL_PS_SHIFT |       \
  34                         SYSCON_CLKSET2_PLL2_EN |                \
  35                         SYSCON_CLKSET2_NBYP2 |                  \
  36                         3 << SYSCON_CLKSET2_USB_DIV_SHIFT)
  37
  38 #define SMC_BCR6_VALUE  (2 << SMC_BCR_IDCY_SHIFT | 5 << SMC_BCR_WST1_SHIFT | \
  39                         SMC_BCR_BLE | 2 << SMC_BCR_WST2_SHIFT | \
  40                         1 << SMC_BCR_MW_SHIFT)
  41
  42 /* delay execution before timers are initialized */
  43 static inline void early_udelay(uint32_t usecs)
  44 {
  45         /* loop takes 4 cycles at 5.0ns (fastest case, running at 200MHz) */
  46         register uint32_t loops = (usecs * 1000) / 20;
  47
  48         __asm__ volatile ("1:\n"
  49                         "subs %0, %1, #1\n"
  50                         "bne 1b" : "=r" (loops) : "0" (loops));
  51 }
  52
  53 #ifndef CONFIG_EP93XX_NO_FLASH_CFG
  54 static void flash_cfg(void)
  55 {
  56         struct smc_regs *smc = (struct smc_regs *)SMC_BASE;
  57
  58         writel(SMC_BCR6_VALUE, &smc->bcr6);
  59 }
  60 #else
  61 #define flash_cfg()
  62 #endif
  63
  64 int board_init(void)
  65 {
  66         /*
  67          * Setup PLL2, PPL1 has been set during lowlevel init
  68          */
  69         struct syscon_regs *syscon = (struct syscon_regs *)SYSCON_BASE;
  70         writel(CLKSET2_VAL, &syscon->clkset2);
  71
  72         /*
  73          * the user's guide recommends to wait at least 1 ms for PLL2 to
  74          * stabilize
  75          */
  76         early_udelay(1000);
  77
  78         /* Go to Async mode */
  79         __asm__ volatile ("mrc p15, 0, r0, c1, c0, 0");
  80         __asm__ volatile ("orr r0, r0, #0xc0000000");
  81         __asm__ volatile ("mcr p15, 0, r0, c1, c0, 0");
  82
  83         icache_enable();
  84
  85 #ifdef USE_920T_MMU
  86         dcache_enable();
  87 #endif
  88
  89         /* Machine number, as defined in linux/arch/arm/tools/mach-types */
  90         gd->bd->bi_arch_number = CONFIG_MACH_TYPE;
  91
  92         /* adress of boot parameters */
  93         gd->bd->bi_boot_params = LINUX_BOOT_PARAM_ADDR;
  94
  95         /* We have a console */
  96         gd->have_console = 1;
  97
  98         enable_interrupts();
  99
 100         flash_cfg();
 101
 102         green_led_on();
 103         red_led_off();
 104
 105         return 0;
 106 }
 107
 108 int board_early_init_f(void)
 109 {
 110         /*
 111          * set UARTBAUD bit to drive UARTs with 14.7456MHz instead of
 112          * 14.7456/2 MHz
 113          */
 114         struct syscon_regs *syscon = (struct syscon_regs *)SYSCON_BASE;
 115         writel(SYSCON_PWRCNT_UART_BAUD, &syscon->pwrcnt);
 116         return 0;
 117 }
 118
 119 int board_eth_init(bd_t *bd)
 120 {
 121         return ep93xx_eth_initialize(0, MAC_BASE);
 122 }
 123
 124 static void dram_fill_bank_addr(unsigned dram_addr_mask, unsigned dram_bank_cnt,
 125                                 unsigned dram_bank_base[CONFIG_NR_DRAM_BANKS])
 126 {
 127         if (dram_bank_cnt == 1) {
 128                 dram_bank_base[0] = PHYS_SDRAM_1;
 129         } else {
 130                 /* Table lookup for holes in address space. Maximum memory
 131                  * for the single SDCS may be up to 256Mb. We start scanning
 132                  * banks from 1Mb, so it could be up to 128 banks theoretically.
 133                  * We need at maximum 7 bits for the loockup, 8 slots is
 134                  * enough for the worst case.
 135                  */
 136                 unsigned tbl[8];
 137                 unsigned i = dram_bank_cnt / 2;
 138                 unsigned j = 0x00100000; /* 1 Mb */
 139                 unsigned *ptbl = tbl;
 140                 do {
 141                         while (!(dram_addr_mask & j)) {
 142                                 j <<= 1;
 143                         }
 144                         *ptbl++ = j;
 145                         j <<= 1;
 146                         i >>= 1;
 147                 } while (i != 0);
 148
 149                 for (i = dram_bank_cnt, j = 0;
 150                      (i != 0) && (j < CONFIG_NR_DRAM_BANKS); --i, ++j) {
 151                         unsigned addr = PHYS_SDRAM_1;
 152                         unsigned k;
 153                         unsigned bit;
 154
 155                         for (k = 0, bit = 1; k < 8; k++, bit <<= 1) {
 156                                 if (bit & j)
 157                                         addr |= tbl[k];
 158                         }
 159
 160                         dram_bank_base[j] = addr;
 161                 }
 162         }
 163 }
 164
 165 /* called in board_init_f (before relocation) */
 166 static unsigned dram_init_banksize_int(int print)
 167 {
 168         /*
 169          * Collect information of banks that has been filled during lowlevel
 170          * initialization
 171          */
 172         unsigned i;
 173         unsigned dram_bank_base[CONFIG_NR_DRAM_BANKS];
 174         unsigned dram_total = 0;
 175         unsigned dram_bank_size = *(unsigned *)
 176                                   (PHYS_SDRAM_1 | UBOOT_MEMORYCNF_BANK_SIZE);
 177         unsigned dram_addr_mask = *(unsigned *)
 178                                   (PHYS_SDRAM_1 | UBOOT_MEMORYCNF_BANK_MASK);
 179         unsigned dram_bank_cnt = *(unsigned *)
 180                                  (PHYS_SDRAM_1 | UBOOT_MEMORYCNF_BANK_COUNT);
 181
 182         dram_fill_bank_addr(dram_addr_mask, dram_bank_cnt, dram_bank_base);
 183
 184         for (i = 0; i < dram_bank_cnt; i++) {
 185                 gd->bd->bi_dram[i].start = dram_bank_base[i];
 186                 gd->bd->bi_dram[i].size = dram_bank_size;
 187                 dram_total += dram_bank_size;
 188         }
 189         for (; i < CONFIG_NR_DRAM_BANKS; i++) {
 190                 gd->bd->bi_dram[i].start = 0;
 191                 gd->bd->bi_dram[i].size = 0;
 192         }
 193
 194         if (print) {
 195                 printf("DRAM mask: %08x\n", dram_addr_mask);
 196                 printf("DRAM total %u banks:\n", dram_bank_cnt);
 197                 printf("bank          base-address          size\n");
 198
 199                 if (dram_bank_cnt > CONFIG_NR_DRAM_BANKS) {
 200                         printf("WARNING! UBoot was configured for %u banks,\n"
 201                                 "but %u has been found. "
 202                                 "Supressing extra memory banks\n",
 203                                  CONFIG_NR_DRAM_BANKS, dram_bank_cnt);
 204                         dram_bank_cnt = CONFIG_NR_DRAM_BANKS;
 205                 }
 206
 207                 for (i = 0; i < dram_bank_cnt; i++) {
 208                         printf("  %u             %08x            %08x\n",
 209                                i, dram_bank_base[i], dram_bank_size);
 210                 }
 211                 printf("  ------------------------------------------\n"
 212                         "Total                              %9d\n\n",
 213                         dram_total);
 214         }
 215
 216         return dram_total;
 217 }
 218
 219 void dram_init_banksize(void)
 220 {
 221         dram_init_banksize_int(0);
 222 }
 223
 224 /* called in board_init_f (before relocation) */
 225 int dram_init(void)
 226 {
 227         struct syscon_regs *syscon = (struct syscon_regs *)SYSCON_BASE;
 228         unsigned sec_id = readl(SECURITY_EXTENSIONID);
 229         unsigned chip_id = readl(&syscon->chipid);
 230
 231         printf("CPU: Cirrus Logic ");
 232         switch (sec_id & 0x000001FE) {
 233         case 0x00000008:
 234                 printf("EP9301");
 235                 break;
 236         case 0x00000004:
 237                 printf("EP9307");
 238                 break;
 239         case 0x00000002:
 240                 printf("EP931x");
 241                 break;
 242         case 0x00000000:
 243                 printf("EP9315");
 244                 break;
 245         default:
 246                 printf("<unknown>");
 247                 break;
 248         }
 249
 250         printf(" - Rev. ");
 251         switch (chip_id & 0xF0000000) {
 252         case 0x00000000:
 253                 printf("A");
 254                 break;
 255         case 0x10000000:
 256                 printf("B");
 257                 break;
 258         case 0x20000000:
 259                 printf("C");
 260                 break;
 261         case 0x30000000:
 262                 printf("D0");
 263                 break;
 264         case 0x40000000:
 265                 printf("D1");
 266                 break;
 267         case 0x50000000:
 268                 printf("E0");
 269                 break;
 270         case 0x60000000:
 271                 printf("E1");
 272                 break;
 273         case 0x70000000:
 274                 printf("E2");
 275                 break;
 276         default:
 277                 printf("?");
 278                 break;
 279         }
 280         printf(" (SecExtID=%.8x/ChipID=%.8x)\n", sec_id, chip_id);
 281
 282         gd->ram_size = dram_init_banksize_int(1);
 283         return 0;
 284 }