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