arch/arm/mach-uniphier/micro-support-card.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2012-2015 Panasonic Corporation
   4  * Copyright (C) 2015-2020 Socionext Inc.
   5  *   Author: Masahiro Yamada <yamada.masahiro@socionext.com>
   6  */
   7
   8 #include <common.h>
   9 #include <dm/of.h>
  10 #include <fdt_support.h>
  11 #include <linux/ctype.h>
  12 #include <linux/io.h>
  13
  14 #include "micro-support-card.h"
  15
  16 #define SMC911X_OFFSET                  0x00000
  17 #define LED_OFFSET                      0x90000
  18 #define NS16550A_OFFSET                 0xb0000
  19 #define MICRO_SUPPORT_CARD_RESET        0xd0034
  20 #define MICRO_SUPPORT_CARD_REVISION     0xd00e0
  21
  22 static bool support_card_found;
  23 static void __iomem *support_card_base;
  24
  25 static void support_card_detect(void)
  26 {
  27         DECLARE_GLOBAL_DATA_PTR;
  28         const void *fdt = gd->fdt_blob;
  29         int offset;
  30         u64 addr, addr2;
  31
  32         offset = fdt_node_offset_by_compatible(fdt, 0, "smsc,lan9118");
  33         if (offset < 0)
  34                 return;
  35
  36         addr = fdt_get_base_address(fdt, offset);
  37         if (addr == OF_BAD_ADDR)
  38                 return;
  39         addr -= SMC911X_OFFSET;
  40
  41         offset = fdt_node_offset_by_compatible(fdt, 0, "ns16550a");
  42         if (offset < 0)
  43                 return;
  44
  45         addr2 = fdt_get_base_address(fdt, offset);
  46         if (addr2 == OF_BAD_ADDR)
  47                 return;
  48         addr2 -= NS16550A_OFFSET;
  49
  50         /* sanity check */
  51         if (addr != addr2)
  52                 return;
  53
  54         support_card_base = ioremap(addr, 0x100000);
  55
  56         support_card_found = true;
  57 }
  58
  59 /*
  60  * 0: reset deassert, 1: reset
  61  *
  62  * bit[0]: LAN, I2C, LED
  63  * bit[1]: UART
  64  */
  65 static void support_card_reset_deassert(void)
  66 {
  67         writel(0x00010000, support_card_base + MICRO_SUPPORT_CARD_RESET);
  68 }
  69
  70 static void support_card_reset(void)
  71 {
  72         writel(0x00020003, support_card_base + MICRO_SUPPORT_CARD_RESET);
  73 }
  74
  75 static int support_card_show_revision(void)
  76 {
  77         u32 revision;
  78
  79         revision = readl(support_card_base + MICRO_SUPPORT_CARD_REVISION);
  80         revision &= 0xff;
  81
  82         /* revision 3.6.x card changed the revision format */
  83         printf("SC:    Micro Support Card (CPLD version %s%d.%d)\n",
  84                revision >> 4 == 6 ? "3." : "",
  85                revision >> 4, revision & 0xf);
  86
  87         return 0;
  88 }
  89
  90 void support_card_init(void)
  91 {
  92         support_card_detect();
  93
  94         if (!support_card_found)
  95                 return;
  96
  97         support_card_reset();
  98         /*
  99          * After power on, we need to keep the LAN controller in reset state
 100          * for a while. (200 usec)
 101          */
 102         udelay(200);
 103         support_card_reset_deassert();
 104
 105         support_card_show_revision();
 106 }
 107
 108 #if defined(CONFIG_SMC911X)
 109 #include <netdev.h>
 110
 111 int board_eth_init(bd_t *bis)
 112 {
 113         if (!support_card_found)
 114                 return 0;
 115
 116         return smc911x_initialize(0, (unsigned long)support_card_base + SMC911X_OFFSET);
 117 }
 118 #endif
 119
 120 #if defined(CONFIG_MTD_NOR_FLASH)
 121
 122 #include <mtd/cfi_flash.h>
 123
 124 struct memory_bank {
 125         phys_addr_t base;
 126         unsigned long size;
 127 };
 128
 129 static int mem_is_flash(const struct memory_bank *mem)
 130 {
 131         const int loop = 128;
 132         u32 *scratch_addr;
 133         u32 saved_value;
 134         int ret = 1;
 135         int i;
 136
 137         /* just in case, use the tail of the memory bank */
 138         scratch_addr = map_physmem(mem->base + mem->size - sizeof(u32) * loop,
 139                                    sizeof(u32) * loop, MAP_NOCACHE);
 140
 141         for (i = 0; i < loop; i++, scratch_addr++) {
 142                 saved_value = readl(scratch_addr);
 143                 writel(~saved_value, scratch_addr);
 144                 if (readl(scratch_addr) != saved_value) {
 145                         /* We assume no memory or SRAM here. */
 146                         writel(saved_value, scratch_addr);
 147                         ret = 0;
 148                         break;
 149                 }
 150         }
 151
 152         unmap_physmem(scratch_addr, MAP_NOCACHE);
 153
 154         return ret;
 155 }
 156
 157 /* {address, size} */
 158 static const struct memory_bank memory_banks[] = {
 159         {0x42000000, 0x01f00000},
 160 };
 161
 162 static const struct memory_bank
 163 *flash_banks_list[CONFIG_SYS_MAX_FLASH_BANKS_DETECT];
 164
 165 phys_addr_t cfi_flash_bank_addr(int i)
 166 {
 167         return flash_banks_list[i]->base;
 168 }
 169
 170 unsigned long cfi_flash_bank_size(int i)
 171 {
 172         return flash_banks_list[i]->size;
 173 }
 174
 175 static void detect_num_flash_banks(void)
 176 {
 177         const struct memory_bank *memory_bank, *end;
 178
 179         cfi_flash_num_flash_banks = 0;
 180
 181         memory_bank = memory_banks;
 182         end = memory_bank + ARRAY_SIZE(memory_banks);
 183
 184         for (; memory_bank < end; memory_bank++) {
 185                 if (cfi_flash_num_flash_banks >=
 186                     CONFIG_SYS_MAX_FLASH_BANKS_DETECT)
 187                         break;
 188
 189                 if (mem_is_flash(memory_bank)) {
 190                         flash_banks_list[cfi_flash_num_flash_banks] =
 191                                                                 memory_bank;
 192
 193                         debug("flash bank found: base = 0x%lx, size = 0x%lx\n",
 194                               (unsigned long)memory_bank->base,
 195                               (unsigned long)memory_bank->size);
 196                         cfi_flash_num_flash_banks++;
 197                 }
 198         }
 199
 200         debug("number of flash banks: %d\n", cfi_flash_num_flash_banks);
 201 }
 202 #else /* CONFIG_MTD_NOR_FLASH */
 203 static void detect_num_flash_banks(void)
 204 {
 205 };
 206 #endif /* CONFIG_MTD_NOR_FLASH */
 207
 208 void support_card_late_init(void)
 209 {
 210         if (!support_card_found)
 211                 return;
 212
 213         detect_num_flash_banks();
 214 }
 215
 216 static const u8 ledval_num[] = {
 217         0x7e, /* 0 */
 218         0x0c, /* 1 */
 219         0xb6, /* 2 */
 220         0x9e, /* 3 */
 221         0xcc, /* 4 */
 222         0xda, /* 5 */
 223         0xfa, /* 6 */
 224         0x4e, /* 7 */
 225         0xfe, /* 8 */
 226         0xde, /* 9 */
 227 };
 228
 229 static const u8 ledval_alpha[] = {
 230         0xee, /* A */
 231         0xf8, /* B */
 232         0x72, /* C */
 233         0xbc, /* D */
 234         0xf2, /* E */
 235         0xe2, /* F */
 236         0x7a, /* G */
 237         0xe8, /* H */
 238         0x08, /* I */
 239         0x3c, /* J */
 240         0xea, /* K */
 241         0x70, /* L */
 242         0x6e, /* M */
 243         0xa8, /* N */
 244         0xb8, /* O */
 245         0xe6, /* P */
 246         0xce, /* Q */
 247         0xa0, /* R */
 248         0xc8, /* S */
 249         0x8c, /* T */
 250         0x7c, /* U */
 251         0x54, /* V */
 252         0xfc, /* W */
 253         0xec, /* X */
 254         0xdc, /* Y */
 255         0xa4, /* Z */
 256 };
 257
 258 static u8 char2ledval(char c)
 259 {
 260         if (isdigit(c))
 261                 return ledval_num[c - '0'];
 262         else if (isalpha(c))
 263                 return ledval_alpha[toupper(c) - 'A'];
 264
 265         return 0;
 266 }
 267
 268 void led_puts(const char *s)
 269 {
 270         int i;
 271         u32 val = 0;
 272
 273         if (!support_card_found)
 274                 return;
 275
 276         if (!s)
 277                 return;
 278
 279         for (i = 0; i < 4; i++) {
 280                 val <<= 8;
 281                 val |= char2ledval(*s);
 282                 if (*s != '\0')
 283                         s++;
 284         }
 285
 286         writel(~val, support_card_base + LED_OFFSET);
 287 }