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omap2/3/4: Introducing 'gpmc-nand.c' for GPMC specific NAND init 

Introducing 'gpmc-nand.c' for GPMC specific NAND init.
For example: GPMC timing parameters and all.
This patch also migrates gpmc related calls from 'nand/omap2.c'
to 'gpmc-nand.c'.

Signed-off-by: Vimal Singh <vimalsingh@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Vimal Singh 2010-02-15 10:03:33 -08:00 committed by Tony Lindgren
parent 30e53bccfa
commit 2f70a1e936
4 changed files with 155 additions and 32 deletions
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3
arch/arm/mach-omap2/Makefile
View File

@ -135,5 +135,8 @@ obj-y += usb-ehci.o
onenand-$(CONFIG_MTD_ONENAND_OMAP2) := gpmc-onenand.o
obj-y += $(onenand-m) $(onenand-y)
nand-$(CONFIG_MTD_NAND_OMAP2) := gpmc-nand.o
obj-y += $(nand-m) $(nand-y)
smc91x-$(CONFIG_SMC91X) := gpmc-smc91x.o
obj-y += $(smc91x-m) $(smc91x-y)

139
arch/arm/mach-omap2/gpmc-nand.c Normal file
View File

@ -0,0 +1,139 @@
/*
* 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>
#define WR_RD_PIN_MONITORING 0x00600000
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;
memset(&t, 0, sizeof(t));
t.sync_clk = gpmc_round_ns_to_ticks(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_write_reg(gpmc_nand_data->cs, GPMC_CS_CONFIG1,
GPMC_CONFIG1_DEVICESIZE(gpmc_nand_data->devsize) |
GPMC_CONFIG1_DEVICETYPE_NAND);
err = gpmc_cs_set_timings(gpmc_nand_data->cs, &t);
if (err)
return err;
return 0;
}
static int gpmc_nand_setup(void)
{
struct device *dev = &gpmc_nand_device.dev;
/* Set timings in GPMC */
if (omap2_nand_gpmc_retime() < 0) {
dev_err(dev, "Unable to set gpmc timings\n");
return -EINVAL;
}
return 0;
}
int __init gpmc_nand_init(struct omap_nand_platform_data *_nand_data)
{
unsigned int val;
int err = 0;
struct device *dev = &gpmc_nand_device.dev;
gpmc_nand_data = _nand_data;
gpmc_nand_data->nand_setup = gpmc_nand_setup;
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;
}
err = gpmc_nand_setup();
if (err < 0) {
dev_err(dev, "NAND platform setup failed: %d\n", err);
return err;
}
/* Enable RD PIN Monitoring Reg */
if (gpmc_nand_data->dev_ready) {
val = gpmc_cs_read_reg(gpmc_nand_data->cs,
GPMC_CS_CONFIG1);
val |= WR_RD_PIN_MONITORING;
gpmc_cs_write_reg(gpmc_nand_data->cs,
GPMC_CS_CONFIG1, val);
}
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;
}

10
arch/arm/plat-omap/include/plat/nand.h
View File

@ -15,10 +15,18 @@ struct omap_nand_platform_data {
int cs;
int gpio_irq;
struct mtd_partition *parts;
struct gpmc_timings *gpmc_t;
int nr_parts;
int (*nand_setup)(void __iomem *);
int (*nand_setup)(void);
int (*dev_ready)(struct omap_nand_platform_data *);
int dma_channel;
unsigned long phys_base;
void __iomem *gpmc_cs_baseaddr;
void __iomem *gpmc_baseaddr;
int devsize;
};
/* size (4 KiB) for IO mapping */
#define NAND_IO_SIZE SZ_4K
extern int gpmc_nand_init(struct omap_nand_platform_data *d);

35
drivers/mtd/nand/omap2.c
View File

@ -30,12 +30,8 @@
#define DRIVER_NAME "omap2-nand"
/* size (4 KiB) for IO mapping */
#define NAND_IO_SIZE SZ_4K
#define NAND_WP_OFF 0
#define NAND_WP_BIT 0x00000010
#define WR_RD_PIN_MONITORING 0x00600000
#define GPMC_BUF_FULL 0x00000001
#define GPMC_BUF_EMPTY 0x00000000
@ -882,8 +878,6 @@ static int __devinit omap_nand_probe(struct platform_device *pdev)
struct omap_nand_info *info;
struct omap_nand_platform_data *pdata;
int err;
unsigned long val;
pdata = pdev->dev.platform_data;
if (pdata == NULL) {
@ -905,28 +899,14 @@ static int __devinit omap_nand_probe(struct platform_device *pdev)
info->gpmc_cs = pdata->cs;
info->gpmc_baseaddr = pdata->gpmc_baseaddr;
info->gpmc_cs_baseaddr = pdata->gpmc_cs_baseaddr;
info->phys_base = pdata->phys_base;
info->mtd.priv = &info->nand;
info->mtd.name = dev_name(&pdev->dev);
info->mtd.owner = THIS_MODULE;
err = gpmc_cs_request(info->gpmc_cs, NAND_IO_SIZE, &info->phys_base);
if (err < 0) {
dev_err(&pdev->dev, "Cannot request GPMC CS\n");
goto out_free_info;
}
/* Enable RD PIN Monitoring Reg */
if (pdata->dev_ready) {
val = gpmc_cs_read_reg(info->gpmc_cs, GPMC_CS_CONFIG1);
val |= WR_RD_PIN_MONITORING;
gpmc_cs_write_reg(info->gpmc_cs, GPMC_CS_CONFIG1, val);
}
val = gpmc_cs_read_reg(info->gpmc_cs, GPMC_CS_CONFIG7);
val &= ~(0xf << 8);
val |= (0xc & 0xf) << 8;
gpmc_cs_write_reg(info->gpmc_cs, GPMC_CS_CONFIG7, val);
info->nand.options |= pdata->devsize ? NAND_BUSWIDTH_16 : 0;
info->nand.options |= NAND_SKIP_BBTSCAN;
/* NAND write protect off */
omap_nand_wp(&info->mtd, NAND_WP_OFF);
@ -934,7 +914,7 @@ static int __devinit omap_nand_probe(struct platform_device *pdev)
if (!request_mem_region(info->phys_base, NAND_IO_SIZE,
pdev->dev.driver->name)) {
err = -EBUSY;
goto out_free_cs;
goto out_free_info;
}
info->nand.IO_ADDR_R = ioremap(info->phys_base, NAND_IO_SIZE);
@ -963,11 +943,6 @@ static int __devinit omap_nand_probe(struct platform_device *pdev)
info->nand.chip_delay = 50;
}
info->nand.options |= NAND_SKIP_BBTSCAN;
if ((gpmc_cs_read_reg(info->gpmc_cs, GPMC_CS_CONFIG1) & 0x3000)
== 0x1000)
info->nand.options |= NAND_BUSWIDTH_16;
if (use_prefetch) {
/* copy the virtual address of nand base for fifo access */
info->nand_pref_fifo_add = info->nand.IO_ADDR_R;
@ -1043,8 +1018,6 @@ static int __devinit omap_nand_probe(struct platform_device *pdev)
out_release_mem_region:
release_mem_region(info->phys_base, NAND_IO_SIZE);
out_free_cs:
gpmc_cs_free(info->gpmc_cs);
out_free_info:
kfree(info);