155 lines
3.8 KiB
C
155 lines
3.8 KiB
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 <linux/omap-gpmc.h>
|
|
#include <linux/mtd/nand.h>
|
|
#include <linux/platform_data/mtd-nand-omap2.h>
|
|
|
|
#include <asm/mach/flash.h>
|
|
|
|
#include "soc.h"
|
|
|
|
/* minimum size for IO mapping */
|
|
#define NAND_IO_SIZE 4
|
|
|
|
static bool gpmc_hwecc_bch_capable(enum omap_ecc ecc_opt)
|
|
{
|
|
/* platforms which support all ECC schemes */
|
|
if (soc_is_am33xx() || soc_is_am43xx() || cpu_is_omap44xx() ||
|
|
soc_is_omap54xx() || soc_is_dra7xx())
|
|
return 1;
|
|
|
|
if (ecc_opt == OMAP_ECC_BCH4_CODE_HW_DETECTION_SW ||
|
|
ecc_opt == OMAP_ECC_BCH8_CODE_HW_DETECTION_SW) {
|
|
if (cpu_is_omap24xx())
|
|
return 0;
|
|
else if (cpu_is_omap3630() && (GET_OMAP_REVISION() == 0))
|
|
return 0;
|
|
else
|
|
return 1;
|
|
}
|
|
|
|
/* OMAP3xxx do not have ELM engine, so cannot support ECC schemes
|
|
* which require H/W based ECC error detection */
|
|
if ((cpu_is_omap34xx() || cpu_is_omap3630()) &&
|
|
((ecc_opt == OMAP_ECC_BCH4_CODE_HW) ||
|
|
(ecc_opt == OMAP_ECC_BCH8_CODE_HW)))
|
|
return 0;
|
|
|
|
/* legacy platforms support only HAM1 (1-bit Hamming) ECC scheme */
|
|
if (ecc_opt == OMAP_ECC_HAM1_CODE_HW ||
|
|
ecc_opt == OMAP_ECC_HAM1_CODE_SW)
|
|
return 1;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
/* This function will go away once the device-tree convertion is complete */
|
|
static void gpmc_set_legacy(struct omap_nand_platform_data *gpmc_nand_data,
|
|
struct gpmc_settings *s)
|
|
{
|
|
/* Enable RD PIN Monitoring Reg */
|
|
if (gpmc_nand_data->dev_ready) {
|
|
s->wait_on_read = true;
|
|
s->wait_on_write = true;
|
|
}
|
|
|
|
if (gpmc_nand_data->devsize == NAND_BUSWIDTH_16)
|
|
s->device_width = GPMC_DEVWIDTH_16BIT;
|
|
else
|
|
s->device_width = GPMC_DEVWIDTH_8BIT;
|
|
}
|
|
|
|
int gpmc_nand_init(struct omap_nand_platform_data *gpmc_nand_data,
|
|
struct gpmc_timings *gpmc_t)
|
|
{
|
|
int err = 0;
|
|
struct gpmc_settings s;
|
|
struct platform_device *pdev;
|
|
struct resource gpmc_nand_res[] = {
|
|
{ .flags = IORESOURCE_MEM, },
|
|
{ .flags = IORESOURCE_IRQ, },
|
|
{ .flags = IORESOURCE_IRQ, },
|
|
};
|
|
|
|
BUG_ON(gpmc_nand_data->cs >= GPMC_CS_NUM);
|
|
|
|
err = gpmc_cs_request(gpmc_nand_data->cs, NAND_IO_SIZE,
|
|
(unsigned long *)&gpmc_nand_res[0].start);
|
|
if (err < 0) {
|
|
pr_err("omap2-gpmc: Cannot request GPMC CS %d, error %d\n",
|
|
gpmc_nand_data->cs, err);
|
|
return err;
|
|
}
|
|
gpmc_nand_res[0].end = gpmc_nand_res[0].start + NAND_IO_SIZE - 1;
|
|
gpmc_nand_res[1].start = gpmc_get_client_irq(GPMC_IRQ_FIFOEVENTENABLE);
|
|
gpmc_nand_res[2].start = gpmc_get_client_irq(GPMC_IRQ_COUNT_EVENT);
|
|
|
|
memset(&s, 0, sizeof(struct gpmc_settings));
|
|
gpmc_set_legacy(gpmc_nand_data, &s);
|
|
|
|
s.device_nand = true;
|
|
|
|
if (gpmc_t) {
|
|
err = gpmc_cs_set_timings(gpmc_nand_data->cs, gpmc_t, &s);
|
|
if (err < 0) {
|
|
pr_err("omap2-gpmc: Unable to set gpmc timings: %d\n",
|
|
err);
|
|
return err;
|
|
}
|
|
}
|
|
|
|
err = gpmc_cs_program_settings(gpmc_nand_data->cs, &s);
|
|
if (err < 0)
|
|
goto out_free_cs;
|
|
|
|
err = gpmc_configure(GPMC_CONFIG_WP, 0);
|
|
if (err < 0)
|
|
goto out_free_cs;
|
|
|
|
if (!gpmc_hwecc_bch_capable(gpmc_nand_data->ecc_opt)) {
|
|
pr_err("omap2-nand: Unsupported NAND ECC scheme selected\n");
|
|
err = -EINVAL;
|
|
goto out_free_cs;
|
|
}
|
|
|
|
|
|
pdev = platform_device_alloc("omap2-nand", gpmc_nand_data->cs);
|
|
if (pdev) {
|
|
err = platform_device_add_resources(pdev, gpmc_nand_res,
|
|
ARRAY_SIZE(gpmc_nand_res));
|
|
if (!err)
|
|
pdev->dev.platform_data = gpmc_nand_data;
|
|
} else {
|
|
err = -ENOMEM;
|
|
}
|
|
if (err)
|
|
goto out_free_pdev;
|
|
|
|
err = platform_device_add(pdev);
|
|
if (err) {
|
|
dev_err(&pdev->dev, "Unable to register NAND device\n");
|
|
goto out_free_pdev;
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_free_pdev:
|
|
platform_device_put(pdev);
|
|
out_free_cs:
|
|
gpmc_cs_free(gpmc_nand_data->cs);
|
|
|
|
return err;
|
|
}
|