arch/arm/mach-ep93xx/snappercl15.c

   1 /*
   2  * arch/arm/mach-ep93xx/snappercl15.c
   3  * Bluewater Systems Snapper CL15 system module
   4  *
   5  * Copyright (C) 2009 Bluewater Systems Ltd
   6  * Author: Ryan Mallon <ryan@bluewatersys.com>
   7  *
   8  * NAND code adapted from driver by:
   9  *   Andre Renaud <andre@bluewatersys.com>
  10  *   James R. McKaskill
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or (at
  15  * your option) any later version.
  16  *
  17  */
  18
  19 #include <linux/platform_device.h>
  20 #include <linux/kernel.h>
  21 #include <linux/init.h>
  22 #include <linux/io.h>
  23 #include <linux/gpio.h>
  24 #include <linux/i2c.h>
  25 #include <linux/i2c-gpio.h>
  26 #include <linux/fb.h>
  27
  28 #include <linux/mtd/partitions.h>
  29 #include <linux/mtd/nand.h>
  30
  31 #include <mach/hardware.h>
  32 #include <mach/fb.h>
  33
  34 #include <asm/mach-types.h>
  35 #include <asm/mach/arch.h>
  36
  37 #define SNAPPERCL15_NAND_BASE   (EP93XX_CS7_PHYS_BASE + SZ_16M)
  38
  39 #define SNAPPERCL15_NAND_WPN    (1 << 8)  /* Write protect (active low) */
  40 #define SNAPPERCL15_NAND_ALE    (1 << 9)  /* Address latch */
  41 #define SNAPPERCL15_NAND_CLE    (1 << 10) /* Command latch */
  42 #define SNAPPERCL15_NAND_CEN    (1 << 11) /* Chip enable (active low) */
  43 #define SNAPPERCL15_NAND_RDY    (1 << 14) /* Device ready */
  44
  45 #define NAND_CTRL_ADDR(chip)    (chip->IO_ADDR_W + 0x40)
  46
  47 static void snappercl15_nand_cmd_ctrl(struct mtd_info *mtd, int cmd,
  48                                       unsigned int ctrl)
  49 {
  50         struct nand_chip *chip = mtd->priv;
  51         static u16 nand_state = SNAPPERCL15_NAND_WPN;
  52         u16 set;
  53
  54         if (ctrl & NAND_CTRL_CHANGE) {
  55                 set = SNAPPERCL15_NAND_CEN | SNAPPERCL15_NAND_WPN;
  56
  57                 if (ctrl & NAND_NCE)
  58                         set &= ~SNAPPERCL15_NAND_CEN;
  59                 if (ctrl & NAND_CLE)
  60                         set |= SNAPPERCL15_NAND_CLE;
  61                 if (ctrl & NAND_ALE)
  62                         set |= SNAPPERCL15_NAND_ALE;
  63
  64                 nand_state &= ~(SNAPPERCL15_NAND_CEN |
  65                                 SNAPPERCL15_NAND_CLE |
  66                                 SNAPPERCL15_NAND_ALE);
  67                 nand_state |= set;
  68                 __raw_writew(nand_state, NAND_CTRL_ADDR(chip));
  69         }
  70
  71         if (cmd != NAND_CMD_NONE)
  72                 __raw_writew((cmd & 0xff) | nand_state, chip->IO_ADDR_W);
  73 }
  74
  75 static int snappercl15_nand_dev_ready(struct mtd_info *mtd)
  76 {
  77         struct nand_chip *chip = mtd->priv;
  78
  79         return !!(__raw_readw(NAND_CTRL_ADDR(chip)) & SNAPPERCL15_NAND_RDY);
  80 }
  81
  82 static const char *snappercl15_nand_part_probes[] = {"cmdlinepart", NULL};
  83
  84 static struct mtd_partition snappercl15_nand_parts[] = {
  85         {
  86                 .name           = "Kernel",
  87                 .offset         = 0,
  88                 .size           = SZ_2M,
  89         },
  90         {
  91                 .name           = "Filesystem",
  92                 .offset         = MTDPART_OFS_APPEND,
  93                 .size           = MTDPART_SIZ_FULL,
  94         },
  95 };
  96
  97 static struct platform_nand_data snappercl15_nand_data = {
  98         .chip = {
  99                 .nr_chips               = 1,
 100                 .part_probe_types       = snappercl15_nand_part_probes,
 101                 .partitions             = snappercl15_nand_parts,
 102                 .nr_partitions          = ARRAY_SIZE(snappercl15_nand_parts),
 103                 .options                = NAND_NO_AUTOINCR,
 104                 .chip_delay             = 25,
 105         },
 106         .ctrl = {
 107                 .dev_ready              = snappercl15_nand_dev_ready,
 108                 .cmd_ctrl               = snappercl15_nand_cmd_ctrl,
 109         },
 110 };
 111
 112 static struct resource snappercl15_nand_resource[] = {
 113         {
 114                 .start          = SNAPPERCL15_NAND_BASE,
 115                 .end            = SNAPPERCL15_NAND_BASE + SZ_4K - 1,
 116                 .flags          = IORESOURCE_MEM,
 117         },
 118 };
 119
 120 static struct platform_device snappercl15_nand_device = {
 121         .name                   = "gen_nand",
 122         .id                     = -1,
 123         .dev.platform_data      = &snappercl15_nand_data,
 124         .resource               = snappercl15_nand_resource,
 125         .num_resources          = ARRAY_SIZE(snappercl15_nand_resource),
 126 };
 127
 128 static struct ep93xx_eth_data __initdata snappercl15_eth_data = {
 129         .phy_id                 = 1,
 130 };
 131
 132 static struct i2c_gpio_platform_data __initdata snappercl15_i2c_gpio_data = {
 133         .sda_pin                = EP93XX_GPIO_LINE_EEDAT,
 134         .sda_is_open_drain      = 0,
 135         .scl_pin                = EP93XX_GPIO_LINE_EECLK,
 136         .scl_is_open_drain      = 0,
 137         .udelay                 = 0,
 138         .timeout                = 0,
 139 };
 140
 141 static struct i2c_board_info __initdata snappercl15_i2c_data[] = {
 142         {
 143                 /* Audio codec */
 144                 I2C_BOARD_INFO("tlv320aic23", 0x1a),
 145         },
 146 };
 147
 148 static struct ep93xxfb_mach_info __initdata snappercl15_fb_info = {
 149         .num_modes              = EP93XXFB_USE_MODEDB,
 150         .bpp                    = 16,
 151 };
 152
 153 static void __init snappercl15_init_machine(void)
 154 {
 155         ep93xx_init_devices();
 156         ep93xx_register_eth(&snappercl15_eth_data, 1);
 157         ep93xx_register_i2c(&snappercl15_i2c_gpio_data, snappercl15_i2c_data,
 158                             ARRAY_SIZE(snappercl15_i2c_data));
 159         ep93xx_register_fb(&snappercl15_fb_info);
 160         ep93xx_register_i2s();
 161         platform_device_register(&snappercl15_nand_device);
 162 }
 163
 164 MACHINE_START(SNAPPER_CL15, "Bluewater Systems Snapper CL15")
 165         /* Maintainer: Ryan Mallon <ryan@bluewatersys.com> */
 166         .boot_params    = EP93XX_SDCE0_PHYS_BASE + 0x100,
 167         .map_io         = ep93xx_map_io,
 168         .init_irq       = ep93xx_init_irq,
 169         .timer          = &ep93xx_timer,
 170         .init_machine   = snappercl15_init_machine,
 171 MACHINE_END