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>

4 files changed, 155 insertions, 32 deletions

diff --git a/arch/arm/mach-omap2/Makefile b/arch/arm/mach-omap2/Makefile
index 492cf164e000..0b17dca695fd 100644
--- a/arch/arm/mach-omap2/Makefile
+++ b/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)
diff --git a/arch/arm/mach-omap2/gpmc-nand.c b/arch/arm/mach-omap2/gpmc-nand.c
new file mode 100644
index 000000000000..64d74f05abbe
--- /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;
+}
diff --git a/arch/arm/plat-omap/include/plat/nand.h b/arch/arm/plat-omap/include/plat/nand.h
index 631a7bed1eef..6ba88d2630d9 100644
--- a/arch/arm/plat-omap/include/plat/nand.h
+++ b/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);
diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index 1bb799f0125c..26aec0080184 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/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);