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snappercl15.c

/*
 * arch/arm/mach-ep93xx/snappercl15.c
 * Bluewater Systems Snapper CL15 system module
 *
 * Copyright (C) 2009 Bluewater Systems Ltd
 * Author: Ryan Mallon <ryan@bluewatersys.com>
 *
 * NAND code adapted from driver by:
 *   Andre Renaud <andre@bluewatersys.com>
 *   James R. McKaskill
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at
 * your option) any later version.
 *
 */

#include <linux/platform_device.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/gpio.h>
#include <linux/i2c.h>
#include <linux/i2c-gpio.h>
#include <linux/fb.h>

#include <linux/mtd/partitions.h>
#include <linux/mtd/nand.h>

#include <mach/hardware.h>
#include <mach/fb.h>

#include <asm/mach-types.h>
#include <asm/mach/arch.h>

#define SNAPPERCL15_NAND_BASE (EP93XX_CS7_PHYS_BASE + SZ_16M)

#define SNAPPERCL15_NAND_WPN  (1 << 8)  /* Write protect (active low) */
#define SNAPPERCL15_NAND_ALE  (1 << 9)  /* Address latch */
#define SNAPPERCL15_NAND_CLE  (1 << 10) /* Command latch */
#define SNAPPERCL15_NAND_CEN  (1 << 11) /* Chip enable (active low) */
#define SNAPPERCL15_NAND_RDY  (1 << 14) /* Device ready */

#define NAND_CTRL_ADDR(chip)  (chip->IO_ADDR_W + 0x40)

static void snappercl15_nand_cmd_ctrl(struct mtd_info *mtd, int cmd,
                              unsigned int ctrl)
{
      struct nand_chip *chip = mtd->priv;
      static u16 nand_state = SNAPPERCL15_NAND_WPN;
      u16 set;

      if (ctrl & NAND_CTRL_CHANGE) {
            set = SNAPPERCL15_NAND_CEN | SNAPPERCL15_NAND_WPN;

            if (ctrl & NAND_NCE)
                  set &= ~SNAPPERCL15_NAND_CEN;
            if (ctrl & NAND_CLE)
                  set |= SNAPPERCL15_NAND_CLE;
            if (ctrl & NAND_ALE)
                  set |= SNAPPERCL15_NAND_ALE;

            nand_state &= ~(SNAPPERCL15_NAND_CEN |
                        SNAPPERCL15_NAND_CLE |
                        SNAPPERCL15_NAND_ALE);
            nand_state |= set;
            __raw_writew(nand_state, NAND_CTRL_ADDR(chip));
      }

      if (cmd != NAND_CMD_NONE)
            __raw_writew((cmd & 0xff) | nand_state, chip->IO_ADDR_W);
}

static int snappercl15_nand_dev_ready(struct mtd_info *mtd)
{
      struct nand_chip *chip = mtd->priv;

      return !!(__raw_readw(NAND_CTRL_ADDR(chip)) & SNAPPERCL15_NAND_RDY);
}

static const char *snappercl15_nand_part_probes[] = {"cmdlinepart", NULL};

static struct mtd_partition snappercl15_nand_parts[] = {
      {
            .name       = "Kernel",
            .offset           = 0,
            .size       = SZ_2M,
      },
      {
            .name       = "Filesystem",
            .offset           = MTDPART_OFS_APPEND,
            .size       = MTDPART_SIZ_FULL,
      },
};

static struct platform_nand_data snappercl15_nand_data = {
      .chip = {
            .nr_chips         = 1,
            .part_probe_types = snappercl15_nand_part_probes,
            .partitions       = snappercl15_nand_parts,
            .nr_partitions          = ARRAY_SIZE(snappercl15_nand_parts),
            .options          = NAND_NO_AUTOINCR,
            .chip_delay       = 25,
      },
      .ctrl = {
            .dev_ready        = snappercl15_nand_dev_ready,
            .cmd_ctrl         = snappercl15_nand_cmd_ctrl,
      },
};

static struct resource snappercl15_nand_resource[] = {
      {
            .start            = SNAPPERCL15_NAND_BASE,
            .end        = SNAPPERCL15_NAND_BASE + SZ_4K - 1,
            .flags            = IORESOURCE_MEM,
      },
};

static struct platform_device snappercl15_nand_device = {
      .name             = "gen_nand",
      .id               = -1,
      .dev.platform_data      = &snappercl15_nand_data,
      .resource         = snappercl15_nand_resource,
      .num_resources          = ARRAY_SIZE(snappercl15_nand_resource),
};

static struct ep93xx_eth_data __initdata snappercl15_eth_data = {
      .phy_id                 = 1,
};

static struct i2c_gpio_platform_data __initdata snappercl15_i2c_gpio_data = {
      .sda_pin          = EP93XX_GPIO_LINE_EEDAT,
      .sda_is_open_drain      = 0,
      .scl_pin          = EP93XX_GPIO_LINE_EECLK,
      .scl_is_open_drain      = 0,
      .udelay                 = 0,
      .timeout          = 0,
};

static struct i2c_board_info __initdata snappercl15_i2c_data[] = {
      {
            /* Audio codec */
            I2C_BOARD_INFO("tlv320aic23", 0x1a),
      },
};

static struct ep93xxfb_mach_info __initdata snappercl15_fb_info = {
      .num_modes        = EP93XXFB_USE_MODEDB,
      .bpp              = 16,
};

static void __init snappercl15_init_machine(void)
{
      ep93xx_init_devices();
      ep93xx_register_eth(&snappercl15_eth_data, 1);
      ep93xx_register_i2c(&snappercl15_i2c_gpio_data, snappercl15_i2c_data,
                      ARRAY_SIZE(snappercl15_i2c_data));
      ep93xx_register_fb(&snappercl15_fb_info);
      ep93xx_register_i2s();
      platform_device_register(&snappercl15_nand_device);
}

MACHINE_START(SNAPPER_CL15, "Bluewater Systems Snapper CL15")
      /* Maintainer: Ryan Mallon <ryan@bluewatersys.com> */
      .boot_params      = EP93XX_SDCE0_PHYS_BASE + 0x100,
      .map_io           = ep93xx_map_io,
      .init_irq   = ep93xx_init_irq,
      .timer            = &ep93xx_timer,
      .init_machine     = snappercl15_init_machine,
MACHINE_END

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