kernel/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
  25 #include <asm/mach-types.h>
  26 #include <asm/mach/map.h>
  27 #include <asm/mach/arch.h>
  28
  29 #include "soc.h"
  30 #include "ts72xx.h"
  31
  32 static struct map_desc ts72xx_io_desc[] __initdata = {
  33         {
  34                 .virtual        = (unsigned long)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        = (unsigned long)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        = (unsigned long)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        = (unsigned long)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        = (unsigned long)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 #define TS72XX_BOOTROM_PART_SIZE        (SZ_16K)
 108 #define TS72XX_REDBOOT_PART_SIZE        (SZ_2M + SZ_1M)
 109
 110 static struct mtd_partition ts72xx_nand_parts[] = {
 111         {
 112                 .name           = "TS-BOOTROM",
 113                 .offset         = 0,
 114                 .size           = TS72XX_BOOTROM_PART_SIZE,
 115                 .mask_flags     = MTD_WRITEABLE,        /* force read-only */
 116         }, {
 117                 .name           = "Linux",
 118                 .offset         = MTDPART_OFS_RETAIN,
 119                 .size           = TS72XX_REDBOOT_PART_SIZE,
 120                                 /* leave so much for last partition */
 121         }, {
 122                 .name           = "RedBoot",
 123                 .offset         = MTDPART_OFS_APPEND,
 124                 .size           = MTDPART_SIZ_FULL,
 125                 .mask_flags     = MTD_WRITEABLE,        /* force read-only */
 126         },
 127 };
 128
 129 static struct platform_nand_data ts72xx_nand_data = {
 130         .chip = {
 131                 .nr_chips       = 1,
 132                 .chip_offset    = 0,
 133                 .chip_delay     = 15,
 134                 .partitions     = ts72xx_nand_parts,
 135                 .nr_partitions  = ARRAY_SIZE(ts72xx_nand_parts),
 136         },
 137         .ctrl = {
 138                 .cmd_ctrl       = ts72xx_nand_hwcontrol,
 139                 .dev_ready      = ts72xx_nand_device_ready,
 140         },
 141 };
 142
 143 static struct resource ts72xx_nand_resource[] = {
 144         {
 145                 .start          = 0,                    /* filled in later */
 146                 .end            = 0,                    /* filled in later */
 147                 .flags          = IORESOURCE_MEM,
 148         },
 149 };
 150
 151 static struct platform_device ts72xx_nand_flash = {
 152         .name                   = "gen_nand",
 153         .id                     = -1,
 154         .dev.platform_data      = &ts72xx_nand_data,
 155         .resource               = ts72xx_nand_resource,
 156         .num_resources          = ARRAY_SIZE(ts72xx_nand_resource),
 157 };
 158
 159
 160 static void __init ts72xx_register_flash(void)
 161 {
 162         /*
 163          * TS7200 has NOR flash all other TS72xx board have NAND flash.
 164          */
 165         if (board_is_ts7200()) {
 166                 ep93xx_register_flash(2, EP93XX_CS6_PHYS_BASE, SZ_16M);
 167         } else {
 168                 resource_size_t start;
 169
 170                 if (is_ts9420_installed())
 171                         start = EP93XX_CS7_PHYS_BASE;
 172                 else
 173                         start = EP93XX_CS6_PHYS_BASE;
 174
 175                 ts72xx_nand_resource[0].start = start;
 176                 ts72xx_nand_resource[0].end = start + SZ_16M - 1;
 177
 178                 platform_device_register(&ts72xx_nand_flash);
 179         }
 180 }
 181
 182
 183 static unsigned char ts72xx_rtc_readbyte(unsigned long addr)
 184 {
 185         __raw_writeb(addr, TS72XX_RTC_INDEX_VIRT_BASE);
 186         return __raw_readb(TS72XX_RTC_DATA_VIRT_BASE);
 187 }
 188
 189 static void ts72xx_rtc_writebyte(unsigned char value, unsigned long addr)
 190 {
 191         __raw_writeb(addr, TS72XX_RTC_INDEX_VIRT_BASE);
 192         __raw_writeb(value, TS72XX_RTC_DATA_VIRT_BASE);
 193 }
 194
 195 static struct m48t86_ops ts72xx_rtc_ops = {
 196         .readbyte       = ts72xx_rtc_readbyte,
 197         .writebyte      = ts72xx_rtc_writebyte,
 198 };
 199
 200 static struct platform_device ts72xx_rtc_device = {
 201         .name           = "rtc-m48t86",
 202         .id             = -1,
 203         .dev            = {
 204                 .platform_data  = &ts72xx_rtc_ops,
 205         },
 206         .num_resources  = 0,
 207 };
 208
 209 static struct resource ts72xx_wdt_resources[] = {
 210         {
 211                 .start  = TS72XX_WDT_CONTROL_PHYS_BASE,
 212                 .end    = TS72XX_WDT_CONTROL_PHYS_BASE + SZ_4K - 1,
 213                 .flags  = IORESOURCE_MEM,
 214         },
 215         {
 216                 .start  = TS72XX_WDT_FEED_PHYS_BASE,
 217                 .end    = TS72XX_WDT_FEED_PHYS_BASE + SZ_4K - 1,
 218                 .flags  = IORESOURCE_MEM,
 219         },
 220 };
 221
 222 static struct platform_device ts72xx_wdt_device = {
 223         .name           = "ts72xx-wdt",
 224         .id             = -1,
 225         .num_resources  = ARRAY_SIZE(ts72xx_wdt_resources),
 226         .resource       = ts72xx_wdt_resources,
 227 };
 228
 229 static struct ep93xx_eth_data __initdata ts72xx_eth_data = {
 230         .phy_id         = 1,
 231 };
 232
 233 static void __init ts72xx_init_machine(void)
 234 {
 235         ep93xx_init_devices();
 236         ts72xx_register_flash();
 237         platform_device_register(&ts72xx_rtc_device);
 238         platform_device_register(&ts72xx_wdt_device);
 239
 240         ep93xx_register_eth(&ts72xx_eth_data, 1);
 241 }
 242
 243 MACHINE_START(TS72XX, "Technologic Systems TS-72xx SBC")
 244         /* Maintainer: Lennert Buytenhek <buytenh@wantstofly.org> */
 245         .atag_offset    = 0x100,
 246         .map_io         = ts72xx_map_io,
 247         .init_irq       = ep93xx_init_irq,
 248         .init_time      = ep93xx_timer_init,
 249         .init_machine   = ts72xx_init_machine,
 250         .init_late      = ep93xx_init_late,
 251         .restart        = ep93xx_restart,
 252 MACHINE_END