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>

1 files changed, 139 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/gpmc-nand.c b/arch/arm/mach-omap2/gpmc-nand.c
new file mode 100644
index 0000000..64d74f0
--- /dev/null
+++ b/arch/arm/mach-omap2/gpmc-nand.c
@@ -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;
+}