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