gpmc-nand.c

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/*
 * gpmc-nand.c
 *
 * Copyright (C) 2009 Texas Instruments
 * Vimal Singh <[email protected]>
 *
 * 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 <linux/mtd/nand.h>
#include <linux/platform_data/mtd-nand-omap2.h>

#include <asm/mach/flash.h>

#include <plat/gpmc.h>

#include "soc.h"

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

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

static int omap2_nand_gpmc_retime(struct omap_nand_platform_data *gpmc_nand_data)
{
    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 */
    if (gpmc_nand_data->devsize == NAND_BUSWIDTH_16)
        gpmc_cs_configure(gpmc_nand_data->cs, GPMC_CONFIG_DEV_SIZE, 1);
    else
        gpmc_cs_configure(gpmc_nand_data->cs, GPMC_CONFIG_DEV_SIZE, 0);
    gpmc_cs_configure(gpmc_nand_data->cs,
            GPMC_CONFIG_DEV_TYPE, GPMC_DEVICETYPE_NAND);
    gpmc_cs_configure(gpmc_nand_data->cs, GPMC_CONFIG_WP, 0);
    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 *gpmc_nand_data)
{
    int err = 0;
    struct device *dev = &gpmc_nand_device.dev;

    gpmc_nand_device.dev.platform_data = gpmc_nand_data;

    err = gpmc_cs_request(gpmc_nand_data->cs, NAND_IO_SIZE,
                (unsigned long *)&gpmc_nand_resource[0].start);
    if (err < 0) {
        dev_err(dev, "Cannot request GPMC CS\n");
        return err;
    }

    gpmc_nand_resource[0].end = gpmc_nand_resource[0].start +
                            NAND_IO_SIZE - 1;

    gpmc_nand_resource[1].start =
                gpmc_get_client_irq(GPMC_IRQ_FIFOEVENTENABLE);
    gpmc_nand_resource[2].start =
                gpmc_get_client_irq(GPMC_IRQ_COUNT_EVENT);
     /* Set timings in GPMC */
    err = omap2_nand_gpmc_retime(gpmc_nand_data);
    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);
    }

    gpmc_update_nand_reg(&gpmc_nand_data->reg, gpmc_nand_data->cs);

    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;
}