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>

arch/arm/mach-omap2/Makefile

@@ -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)

arch/arm/mach-omap2/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>
+
+#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;
+}

arch/arm/plat-omap/include/plat/nand.h

@@ -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);

drivers/mtd/nand/omap2.c

@@ -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);