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 <[email protected]>
Signed-off-by: Tony Lindgren <[email protected]>
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 <[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/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;
+}
