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gpmc-nand.c

/*
 * gpmc-nand.c
 *
 * Copyright (C) 2009 Texas Instruments
 * Vimal Singh <vimalsingh@ti.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/io.h>

#include <asm/mach/flash.h>

#include <plat/nand.h>
#include <plat/board.h>
#include <plat/gpmc.h>

static struct omap_nand_platform_data *gpmc_nand_data;

static struct resource gpmc_nand_resource = {
      .flags            = IORESOURCE_MEM,
};

static struct platform_device gpmc_nand_device = {
      .name       = "omap2-nand",
      .id         = 0,
      .num_resources    = 1,
      .resource   = &gpmc_nand_resource,
};

static int omap2_nand_gpmc_retime(void)
{
      struct gpmc_timings t;
      int err;

      if (!gpmc_nand_data->gpmc_t)
            return 0;

      memset(&t, 0, sizeof(t));
      t.sync_clk = gpmc_nand_data->gpmc_t->sync_clk;
      t.cs_on = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->cs_on);
      t.adv_on = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->adv_on);

      /* Read */
      t.adv_rd_off = gpmc_round_ns_to_ticks(
                        gpmc_nand_data->gpmc_t->adv_rd_off);
      t.oe_on  = t.adv_on;
      t.access = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->access);
      t.oe_off = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->oe_off);
      t.cs_rd_off = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->cs_rd_off);
      t.rd_cycle  = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->rd_cycle);

      /* Write */
      t.adv_wr_off = gpmc_round_ns_to_ticks(
                        gpmc_nand_data->gpmc_t->adv_wr_off);
      t.we_on  = t.oe_on;
      if (cpu_is_omap34xx()) {
          t.wr_data_mux_bus = gpmc_round_ns_to_ticks(
                        gpmc_nand_data->gpmc_t->wr_data_mux_bus);
          t.wr_access = gpmc_round_ns_to_ticks(
                        gpmc_nand_data->gpmc_t->wr_access);
      }
      t.we_off = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->we_off);
      t.cs_wr_off = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->cs_wr_off);
      t.wr_cycle  = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->wr_cycle);

      /* Configure GPMC */
      gpmc_cs_configure(gpmc_nand_data->cs,
                        GPMC_CONFIG_DEV_SIZE, gpmc_nand_data->devsize);
      gpmc_cs_configure(gpmc_nand_data->cs,
                  GPMC_CONFIG_DEV_TYPE, GPMC_DEVICETYPE_NAND);
      err = gpmc_cs_set_timings(gpmc_nand_data->cs, &t);
      if (err)
            return err;

      return 0;
}

int __init gpmc_nand_init(struct omap_nand_platform_data *_nand_data)
{
      int err     = 0;
      struct device *dev = &gpmc_nand_device.dev;

      gpmc_nand_data = _nand_data;
      gpmc_nand_data->nand_setup = omap2_nand_gpmc_retime;
      gpmc_nand_device.dev.platform_data = gpmc_nand_data;

      err = gpmc_cs_request(gpmc_nand_data->cs, NAND_IO_SIZE,
                        &gpmc_nand_data->phys_base);
      if (err < 0) {
            dev_err(dev, "Cannot request GPMC CS\n");
            return err;
      }

       /* Set timings in GPMC */
      err = omap2_nand_gpmc_retime();
      if (err < 0) {
            dev_err(dev, "Unable to set gpmc timings: %d\n", err);
            return err;
      }

      /* Enable RD PIN Monitoring Reg */
      if (gpmc_nand_data->dev_ready) {
            gpmc_cs_configure(gpmc_nand_data->cs, GPMC_CONFIG_RDY_BSY, 1);
      }

      err = platform_device_register(&gpmc_nand_device);
      if (err < 0) {
            dev_err(dev, "Unable to register NAND device\n");
            goto out_free_cs;
      }

      return 0;

out_free_cs:
      gpmc_cs_free(gpmc_nand_data->cs);

      return err;
}

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