board-flash.c

Go to the documentation of this file.

/*
 * board-flash.c
 * Modified from mach-omap2/board-3430sdp-flash.c
 *
 * Copyright (C) 2009 Nokia Corporation
 * 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/mtd/physmap.h>
#include <linux/io.h>

#include <plat/cpu.h>
#include <plat/gpmc.h>
#include <linux/platform_data/mtd-nand-omap2.h>
#include <linux/platform_data/mtd-onenand-omap2.h>
#include <plat/tc.h>

#include "common.h"
#include "board-flash.h"

#define REG_FPGA_REV            0x10
#define REG_FPGA_DIP_SWITCH_INPUT2  0x60
#define MAX_SUPPORTED_GPMC_CONFIG   3

#define DEBUG_BASE      0x08000000 /* debug board */

/* various memory sizes */
#define FLASH_SIZE_SDPV1    SZ_64M  /* NOR flash (64 Meg aligned) */
#define FLASH_SIZE_SDPV2    SZ_128M /* NOR flash (256 Meg aligned) */

static struct physmap_flash_data board_nor_data = {
    .width      = 2,
};

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

static struct platform_device board_nor_device = {
    .name       = "physmap-flash",
    .id     = 0,
    .dev        = {
            .platform_data = &board_nor_data,
    },
    .num_resources  = 1,
    .resource   = &board_nor_resource,
};

static void
__init board_nor_init(struct mtd_partition *nor_parts, u8 nr_parts, u8 cs)
{
    int err;

    board_nor_data.parts    = nor_parts;
    board_nor_data.nr_parts = nr_parts;

    /* Configure start address and size of NOR device */
    if (omap_rev() >= OMAP3430_REV_ES1_0) {
        err = gpmc_cs_request(cs, FLASH_SIZE_SDPV2 - 1,
                (unsigned long *)&board_nor_resource.start);
        board_nor_resource.end = board_nor_resource.start
                    + FLASH_SIZE_SDPV2 - 1;
    } else {
        err = gpmc_cs_request(cs, FLASH_SIZE_SDPV1 - 1,
                (unsigned long *)&board_nor_resource.start);
        board_nor_resource.end = board_nor_resource.start
                    + FLASH_SIZE_SDPV1 - 1;
    }
    if (err < 0) {
        pr_err("NOR: Can't request GPMC CS\n");
        return;
    }
    if (platform_device_register(&board_nor_device) < 0)
        pr_err("Unable to register NOR device\n");
}

#if defined(CONFIG_MTD_ONENAND_OMAP2) || \
        defined(CONFIG_MTD_ONENAND_OMAP2_MODULE)
static struct omap_onenand_platform_data board_onenand_data = {
    .dma_channel    = -1,   /* disable DMA in OMAP OneNAND driver */
};

void
__init board_onenand_init(struct mtd_partition *onenand_parts,
                u8 nr_parts, u8 cs)
{
    board_onenand_data.cs       = cs;
    board_onenand_data.parts    = onenand_parts;
    board_onenand_data.nr_parts = nr_parts;

    gpmc_onenand_init(&board_onenand_data);
}
#endif /* CONFIG_MTD_ONENAND_OMAP2 || CONFIG_MTD_ONENAND_OMAP2_MODULE */

#if defined(CONFIG_MTD_NAND_OMAP2) || \
        defined(CONFIG_MTD_NAND_OMAP2_MODULE)

/* Note that all values in this struct are in nanoseconds */
static struct gpmc_timings nand_timings = {

    .sync_clk = 0,

    .cs_on = 0,
    .cs_rd_off = 36,
    .cs_wr_off = 36,

    .adv_on = 6,
    .adv_rd_off = 24,
    .adv_wr_off = 36,

    .we_off = 30,
    .oe_off = 48,

    .access = 54,
    .rd_cycle = 72,
    .wr_cycle = 72,

    .wr_access = 30,
    .wr_data_mux_bus = 0,
};

static struct omap_nand_platform_data board_nand_data = {
    .gpmc_t     = &nand_timings,
};

void
__init board_nand_init(struct mtd_partition *nand_parts,
            u8 nr_parts, u8 cs, int nand_type)
{
    board_nand_data.cs      = cs;
    board_nand_data.parts       = nand_parts;
    board_nand_data.nr_parts    = nr_parts;
    board_nand_data.devsize     = nand_type;

    board_nand_data.ecc_opt = OMAP_ECC_HAMMING_CODE_DEFAULT;
    gpmc_nand_init(&board_nand_data);
}
#endif /* CONFIG_MTD_NAND_OMAP2 || CONFIG_MTD_NAND_OMAP2_MODULE */

static u8 get_gpmc0_type(void)
{
    u8 cs = 0;
    void __iomem *fpga_map_addr;

    fpga_map_addr = ioremap(DEBUG_BASE, 4096);
    if (!fpga_map_addr)
        return -ENOMEM;

    if (!(__raw_readw(fpga_map_addr + REG_FPGA_REV)))
        /* we dont have an DEBUG FPGA??? */
        /* Depend on #defines!! default to strata boot return param */
        goto unmap;

    /* S8-DIP-OFF = 1, S8-DIP-ON = 0 */
    cs = __raw_readw(fpga_map_addr + REG_FPGA_DIP_SWITCH_INPUT2) & 0xf;

    /* ES2.0 SDP's onwards 4 dip switches are provided for CS */
    if (omap_rev() >= OMAP3430_REV_ES1_0)
        /* change (S8-1:4=DS-2:0) to (S8-4:1=DS-2:0) */
        cs = ((cs & 8) >> 3) | ((cs & 4) >> 1) |
            ((cs & 2) << 1) | ((cs & 1) << 3);
    else
        /* change (S8-1:3=DS-2:0) to (S8-3:1=DS-2:0) */
        cs = ((cs & 4) >> 2) | (cs & 2) | ((cs & 1) << 2);
unmap:
    iounmap(fpga_map_addr);
    return cs;
}

void __init board_flash_init(struct flash_partitions partition_info[],
            char chip_sel_board[][GPMC_CS_NUM], int nand_type)
{
    u8      cs = 0;
    u8      norcs = GPMC_CS_NUM + 1;
    u8      nandcs = GPMC_CS_NUM + 1;
    u8      onenandcs = GPMC_CS_NUM + 1;
    u8      idx;
    unsigned char   *config_sel = NULL;

    /* REVISIT: Is this return correct idx for 2430 SDP?
     * for which cs configuration matches for 2430 SDP?
     */
    idx = get_gpmc0_type();
    if (idx >= MAX_SUPPORTED_GPMC_CONFIG) {
        pr_err("%s: Invalid chip select: %d\n", __func__, cs);
        return;
    }
    config_sel = (unsigned char *)(chip_sel_board[idx]);

    while (cs < GPMC_CS_NUM) {
        switch (config_sel[cs]) {
        case PDC_NOR:
            if (norcs > GPMC_CS_NUM)
                norcs = cs;
            break;
        case PDC_NAND:
            if (nandcs > GPMC_CS_NUM)
                nandcs = cs;
            break;
        case PDC_ONENAND:
            if (onenandcs > GPMC_CS_NUM)
                onenandcs = cs;
            break;
        }
        cs++;
    }

    if (norcs > GPMC_CS_NUM)
        pr_err("NOR: Unable to find configuration in GPMC\n");
    else
        board_nor_init(partition_info[0].parts,
                partition_info[0].nr_parts, norcs);

    if (onenandcs > GPMC_CS_NUM)
        pr_err("OneNAND: Unable to find configuration in GPMC\n");
    else
        board_onenand_init(partition_info[1].parts,
                    partition_info[1].nr_parts, onenandcs);

    if (nandcs > GPMC_CS_NUM)
        pr_err("NAND: Unable to find configuration in GPMC\n");
    else
        board_nand_init(partition_info[2].parts,
            partition_info[2].nr_parts, nandcs, nand_type);
}