arch/arm/mach-ep93xx/ts72xx.c

   1 /*
   2  * arch/arm/mach-ep93xx/ts72xx.c
   3  * Technologic Systems TS72xx SBC support.
   4  *
   5  * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or (at
  10  * your option) any later version.
  11  */
  12
  13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  14
  15 #include <linux/kernel.h>
  16 #include <linux/init.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/io.h>
  19 #include <linux/m48t86.h>
  20 #include <linux/mtd/nand.h>
  21 #include <linux/mtd/partitions.h>
  22
  23 #include <mach/hardware.h>
  24 #include <mach/ts72xx.h>
  25
  26 #include <asm/mach-types.h>
  27 #include <asm/mach/map.h>
  28 #include <asm/mach/arch.h>
  29
  30
  31 static struct map_desc ts72xx_io_desc[] __initdata = {
  32         {
  33                 .virtual        = TS72XX_MODEL_VIRT_BASE,
  34                 .pfn            = __phys_to_pfn(TS72XX_MODEL_PHYS_BASE),
  35                 .length         = TS72XX_MODEL_SIZE,
  36                 .type           = MT_DEVICE,
  37         }, {
  38                 .virtual        = TS72XX_OPTIONS_VIRT_BASE,
  39                 .pfn            = __phys_to_pfn(TS72XX_OPTIONS_PHYS_BASE),
  40                 .length         = TS72XX_OPTIONS_SIZE,
  41                 .type           = MT_DEVICE,
  42         }, {
  43                 .virtual        = TS72XX_OPTIONS2_VIRT_BASE,
  44                 .pfn            = __phys_to_pfn(TS72XX_OPTIONS2_PHYS_BASE),
  45                 .length         = TS72XX_OPTIONS2_SIZE,
  46                 .type           = MT_DEVICE,
  47         }, {
  48                 .virtual        = TS72XX_RTC_INDEX_VIRT_BASE,
  49                 .pfn            = __phys_to_pfn(TS72XX_RTC_INDEX_PHYS_BASE),
  50                 .length         = TS72XX_RTC_INDEX_SIZE,
  51                 .type           = MT_DEVICE,
  52         }, {
  53                 .virtual        = TS72XX_RTC_DATA_VIRT_BASE,
  54                 .pfn            = __phys_to_pfn(TS72XX_RTC_DATA_PHYS_BASE),
  55                 .length         = TS72XX_RTC_DATA_SIZE,
  56                 .type           = MT_DEVICE,
  57         }
  58 };
  59
  60 static void __init ts72xx_map_io(void)
  61 {
  62         ep93xx_map_io();
  63         iotable_init(ts72xx_io_desc, ARRAY_SIZE(ts72xx_io_desc));
  64 }
  65
  66
  67 /*************************************************************************
  68  * NAND flash
  69  *************************************************************************/
  70 #define TS72XX_NAND_CONTROL_ADDR_LINE   22      /* 0xN0400000 */
  71 #define TS72XX_NAND_BUSY_ADDR_LINE      23      /* 0xN0800000 */
  72
  73 static void ts72xx_nand_hwcontrol(struct mtd_info *mtd,
  74                                   int cmd, unsigned int ctrl)
  75 {
  76         struct nand_chip *chip = mtd->priv;
  77
  78         if (ctrl & NAND_CTRL_CHANGE) {
  79                 void __iomem *addr = chip->IO_ADDR_R;
  80                 unsigned char bits;
  81
  82                 addr += (1 << TS72XX_NAND_CONTROL_ADDR_LINE);
  83
  84                 bits = __raw_readb(addr) & ~0x07;
  85                 bits |= (ctrl & NAND_NCE) << 2; /* bit 0 -> bit 2 */
  86                 bits |= (ctrl & NAND_CLE);      /* bit 1 -> bit 1 */
  87                 bits |= (ctrl & NAND_ALE) >> 2; /* bit 2 -> bit 0 */
  88
  89                 __raw_writeb(bits, addr);
  90         }
  91
  92         if (cmd != NAND_CMD_NONE)
  93                 __raw_writeb(cmd, chip->IO_ADDR_W);
  94 }
  95
  96 static int ts72xx_nand_device_ready(struct mtd_info *mtd)
  97 {
  98         struct nand_chip *chip = mtd->priv;
  99         void __iomem *addr = chip->IO_ADDR_R;
 100
 101         addr += (1 << TS72XX_NAND_BUSY_ADDR_LINE);
 102
 103         return !!(__raw_readb(addr) & 0x20);
 104 }
 105
 106 static const char *ts72xx_nand_part_probes[] = { "cmdlinepart", NULL };
 107
 108 #define TS72XX_BOOTROM_PART_SIZE        (SZ_16K)
 109 #define TS72XX_REDBOOT_PART_SIZE        (SZ_2M + SZ_1M)
 110
 111 static struct mtd_partition ts72xx_nand_parts[] = {
 112         {
 113                 .name           = "TS-BOOTROM",
 114                 .offset         = 0,
 115                 .size           = TS72XX_BOOTROM_PART_SIZE,
 116                 .mask_flags     = MTD_WRITEABLE,        /* force read-only */
 117         }, {
 118                 .name           = "Linux",
 119                 .offset         = MTDPART_OFS_RETAIN,
 120                 .size           = TS72XX_REDBOOT_PART_SIZE,
 121                                 /* leave so much for last partition */
 122         }, {
 123                 .name           = "RedBoot",
 124                 .offset         = MTDPART_OFS_APPEND,
 125                 .size           = MTDPART_SIZ_FULL,
 126                 .mask_flags     = MTD_WRITEABLE,        /* force read-only */
 127         },
 128 };
 129
 130 static struct platform_nand_data ts72xx_nand_data = {
 131         .chip = {
 132                 .nr_chips       = 1,
 133                 .chip_offset    = 0,
 134                 .chip_delay     = 15,
 135                 .part_probe_types = ts72xx_nand_part_probes,
 136                 .partitions     = ts72xx_nand_parts,
 137                 .nr_partitions  = ARRAY_SIZE(ts72xx_nand_parts),
 138         },
 139         .ctrl = {
 140                 .cmd_ctrl       = ts72xx_nand_hwcontrol,
 141                 .dev_ready      = ts72xx_nand_device_ready,
 142         },
 143 };
 144
 145 static struct resource ts72xx_nand_resource[] = {
 146         {
 147                 .start          = 0,                    /* filled in later */
 148                 .end            = 0,                    /* filled in later */
 149                 .flags          = IORESOURCE_MEM,
 150         },
 151 };
 152
 153 static struct platform_device ts72xx_nand_flash = {
 154         .name                   = "gen_nand",
 155         .id                     = -1,
 156         .dev.platform_data      = &ts72xx_nand_data,
 157         .resource               = ts72xx_nand_resource,
 158         .num_resources          = ARRAY_SIZE(ts72xx_nand_resource),
 159 };
 160
 161
 162 static void __init ts72xx_register_flash(void)
 163 {
 164         /*
 165          * TS7200 has NOR flash all other TS72xx board have NAND flash.
 166          */
 167         if (board_is_ts7200()) {
 168                 ep93xx_register_flash(2, EP93XX_CS6_PHYS_BASE, SZ_16M);
 169         } else {
 170                 resource_size_t start;
 171
 172                 if (is_ts9420_installed())
 173                         start = EP93XX_CS7_PHYS_BASE;
 174                 else
 175                         start = EP93XX_CS6_PHYS_BASE;
 176
 177                 ts72xx_nand_resource[0].start = start;
 178                 ts72xx_nand_resource[0].end = start + SZ_16M - 1;
 179
 180                 platform_device_register(&ts72xx_nand_flash);
 181         }
 182 }
 183
 184
 185 static unsigned char ts72xx_rtc_readbyte(unsigned long addr)
 186 {
 187         __raw_writeb(addr, TS72XX_RTC_INDEX_VIRT_BASE);
 188         return __raw_readb(TS72XX_RTC_DATA_VIRT_BASE);
 189 }
 190
 191 static void ts72xx_rtc_writebyte(unsigned char value, unsigned long addr)
 192 {
 193         __raw_writeb(addr, TS72XX_RTC_INDEX_VIRT_BASE);
 194         __raw_writeb(value, TS72XX_RTC_DATA_VIRT_BASE);
 195 }
 196
 197 static struct m48t86_ops ts72xx_rtc_ops = {
 198         .readbyte       = ts72xx_rtc_readbyte,
 199         .writebyte      = ts72xx_rtc_writebyte,
 200 };
 201
 202 static struct platform_device ts72xx_rtc_device = {
 203         .name           = "rtc-m48t86",
 204         .id             = -1,
 205         .dev            = {
 206                 .platform_data  = &ts72xx_rtc_ops,
 207         },
 208         .num_resources  = 0,
 209 };
 210
 211 static struct resource ts72xx_wdt_resources[] = {
 212         {
 213                 .start  = TS72XX_WDT_CONTROL_PHYS_BASE,
 214                 .end    = TS72XX_WDT_CONTROL_PHYS_BASE + SZ_4K - 1,
 215                 .flags  = IORESOURCE_MEM,
 216         },
 217         {
 218                 .start  = TS72XX_WDT_FEED_PHYS_BASE,
 219                 .end    = TS72XX_WDT_FEED_PHYS_BASE + SZ_4K - 1,
 220                 .flags  = IORESOURCE_MEM,
 221         },
 222 };
 223
 224 static struct platform_device ts72xx_wdt_device = {
 225         .name           = "ts72xx-wdt",
 226         .id             = -1,
 227         .num_resources  = ARRAY_SIZE(ts72xx_wdt_resources),
 228         .resource       = ts72xx_wdt_resources,
 229 };
 230
 231 static struct ep93xx_eth_data __initdata ts72xx_eth_data = {
 232         .phy_id         = 1,
 233 };
 234
 235 static void __init ts72xx_init_machine(void)
 236 {
 237         ep93xx_init_devices();
 238         ts72xx_register_flash();
 239         platform_device_register(&ts72xx_rtc_device);
 240         platform_device_register(&ts72xx_wdt_device);
 241
 242         ep93xx_register_eth(&ts72xx_eth_data, 1);
 243 }
 244
 245 MACHINE_START(TS72XX, "Technologic Systems TS-72xx SBC")
 246         /* Maintainer: Lennert Buytenhek <buytenh@wantstofly.org> */
 247         .atag_offset    = 0x100,
 248         .map_io         = ts72xx_map_io,
 249         .init_irq       = ep93xx_init_irq,
 250         .timer          = &ep93xx_timer,
 251         .init_machine   = ts72xx_init_machine,
 252 MACHINE_END