[PATCH] Introducing 'gpmc-nand.c' for GPMC specific NAND init
Vimal Singh
vimalsingh at ti.com
Wed Nov 25 07:53:15 EST 2009
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 at ti.com>
---
arch/arm/mach-omap2/Makefile | 3 +
arch/arm/mach-omap2/gpmc-nand.c | 141 ++++++++++++++++++++++++++++=
++++
arch/arm/plat-omap/include/plat/nand.h | 6 ++
drivers/mtd/nand/omap2.c | 26 +-----
4 files changed, 153 insertions(+), 23 deletions(-)
create mode 100644 arch/arm/mach-omap2/gpmc-nand.c
diff --git a/arch/arm/mach-omap2/Makefile b/arch/arm/mach-omap2/Makefile
index 59b0ccc..0dfe27a 100644
--- a/arch/arm/mach-omap2/Makefile
+++ b/arch/arm/mach-omap2/Makefile
@@ -103,5 +103,8 @@ obj-y +=3D usb-ehci.o
onenand-$(CONFIG_MTD_ONENAND_OMAP2) :=3D gpmc-onenand.o
obj-y +=3D $(onenand-m) $(onenand-y)
+nand-$(CONFIG_MTD_NAND_OMAP2) :=3D gpmc-nand.o
+obj-y +=3D $(nand-m) $(nand-y)
+
smc91x-$(CONFIG_SMC91X) :=3D gpmc-smc91x.o
obj-y +=3D $(smc91x-m) $(smc91x-y)
diff --git a/arch/arm/mach-omap2/gpmc-nand.c b/arch/arm/mach-omap2/gpmc-nan=
d.c
new file mode 100644
index 0000000..0621e39
--- /dev/null
+++ b/arch/arm/mach-omap2/gpmc-nand.c
@@ -0,0 +1,141 @@
+/*
+ * gpmc-nand.c
+ *
+ * Copyright (C) 2009 Texas Instruments
+ * Vimal Singh <vimalsingh at 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 =3D {
+ .flags =3D IORESOURCE_MEM,
+};
+
+static struct platform_device gpmc_nand_device =3D {
+ .name =3D "omap2-nand",
+ .id =3D 0,
+ .num_resources =3D 1,
+ .resource =3D &gpmc_nand_resource,
+};
+
+static int omap2_nand_gpmc_config(int cs, void __iomem *nand_base)
+{
+ struct gpmc_timings t;
+ int err;
+
+ const int cs_rd_off =3D 36;
+ const int cs_wr_off =3D 36;
+ const int adv_on =3D 6;
+ const int adv_rd_off =3D 24;
+ const int adv_wr_off =3D 36;
+ const int oe_off =3D 48;
+ const int we_off =3D 30;
+ const int rd_cycle =3D 72;
+ const int wr_cycle =3D 72;
+ const int access =3D 54;
+ const int wr_data_mux_bus =3D 8;
+ const int wr_access =3D 30;
+
+ memset(&t, 0, sizeof(t));
+ t.sync_clk =3D 0;
+ t.cs_on =3D 0;
+ t.adv_on =3D gpmc_round_ns_to_ticks(adv_on);
+
+ /* Read */
+ t.adv_rd_off =3D gpmc_round_ns_to_ticks(adv_rd_off);
+ t.oe_on =3D t.adv_on;
+ t.access =3D gpmc_round_ns_to_ticks(access);
+ t.oe_off =3D gpmc_round_ns_to_ticks(oe_off);
+ t.cs_rd_off =3D gpmc_round_ns_to_ticks(cs_rd_off);
+ t.rd_cycle =3D gpmc_round_ns_to_ticks(rd_cycle);
+
+ /* Write */
+ t.adv_wr_off =3D gpmc_round_ns_to_ticks(adv_wr_off);
+ t.we_on =3D t.oe_on;
+ if (cpu_is_omap34xx()) {
+ t.wr_data_mux_bus =3D gpmc_round_ns_to_ticks(wr_data_mux_bus);
+ t.wr_access =3D gpmc_round_ns_to_ticks(wr_access);
+ }
+ t.we_off =3D gpmc_round_ns_to_ticks(we_off);
+ t.cs_wr_off =3D gpmc_round_ns_to_ticks(cs_wr_off);
+ t.wr_cycle =3D gpmc_round_ns_to_ticks(wr_cycle);
+
+ /* Configure GPMC */
+ gpmc_cs_write_reg(cs, GPMC_CS_CONFIG1,
+ GPMC_CONFIG1_DEVICESIZE(gpmc_nand_data->devsize) |
+ GPMC_CONFIG1_DEVICETYPE_NAND);
+
+ err =3D gpmc_cs_set_timings(cs, &t);
+ if (err)
+ return err;
+
+ return 0;
+}
+
+static int gpmc_nand_setup(void __iomem *nand_base)
+{
+ struct device *dev =3D &gpmc_nand_device.dev;
+
+ /* Set timings in GPMC */
+ if (omap2_nand_gpmc_config(gpmc_nand_data->cs, nand_base) < 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 =3D 0;
+ struct device *dev =3D &gpmc_nand_device.dev;
+
+ gpmc_nand_data =3D _nand_data;
+ gpmc_nand_data->nand_setup =3D gpmc_nand_setup;
+ gpmc_nand_device.dev.platform_data =3D gpmc_nand_data;
+
+ err =3D gpmc_nand_setup(gpmc_nand_data->gpmc_cs_baseaddr);
+ 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 =3D gpmc_cs_read_reg(gpmc_nand_data->cs,
+ GPMC_CS_CONFIG1);
+ val |=3D WR_RD_PIN_MONITORING;
+ gpmc_cs_write_reg(gpmc_nand_data->cs,
+ GPMC_CS_CONFIG1, val);
+ }
+
+ val =3D gpmc_cs_read_reg(gpmc_nand_data->cs, GPMC_CS_CONFIG7);
+ val &=3D ~(0xf << 8);
+ val |=3D (0xc & 0xf) << 8;
+ gpmc_cs_write_reg(gpmc_nand_data->cs, GPMC_CS_CONFIG7, val);
+
+ err =3D platform_device_register(&gpmc_nand_device);
+ if (err < 0) {
+ dev_err(dev, "Unable to register NAND device\n");
+ return err;
+ }
+
+ return 0;
+}
diff --git a/arch/arm/plat-omap/include/plat/nand.h
b/arch/arm/plat-omap/include/plat/nand.h
index 631a7be..2ba9842 100644
--- a/arch/arm/plat-omap/include/plat/nand.h
+++ b/arch/arm/plat-omap/include/plat/nand.h
@@ -21,4 +21,10 @@ struct omap_nand_platform_data {
int dma_channel;
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 1bb799f..aaef170 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 =3D pdev->dev.platform_data;
if (pdata =3D=3D NULL) {
@@ -910,24 +904,15 @@ static int __devinit omap_nand_probe(struct
platform_device *pdev)
info->mtd.name =3D dev_name(&pdev->dev);
info->mtd.owner =3D THIS_MODULE;
+ info->nand.options |=3D pdata->devsize ? NAND_BUSWIDTH_16 : 0;
+ info->nand.options |=3D NAND_SKIP_BBTSCAN;
+
err =3D 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 =3D gpmc_cs_read_reg(info->gpmc_cs, GPMC_CS_CONFIG1);
- val |=3D WR_RD_PIN_MONITORING;
- gpmc_cs_write_reg(info->gpmc_cs, GPMC_CS_CONFIG1, val);
- }
-
- val =3D gpmc_cs_read_reg(info->gpmc_cs, GPMC_CS_CONFIG7);
- val &=3D ~(0xf << 8);
- val |=3D (0xc & 0xf) << 8;
- gpmc_cs_write_reg(info->gpmc_cs, GPMC_CS_CONFIG7, val);
-
/* NAND write protect off */
omap_nand_wp(&info->mtd, NAND_WP_OFF);
@@ -963,11 +948,6 @@ static int __devinit omap_nand_probe(struct
platform_device *pdev)
info->nand.chip_delay =3D 50;
}
- info->nand.options |=3D NAND_SKIP_BBTSCAN;
- if ((gpmc_cs_read_reg(info->gpmc_cs, GPMC_CS_CONFIG1) & 0x3000)
- =3D=3D 0x1000)
- info->nand.options |=3D NAND_BUSWIDTH_16;
-
if (use_prefetch) {
/* copy the virtual address of nand base for fifo access */
info->nand_pref_fifo_add =3D info->nand.IO_ADDR_R;
--=20
1.5.5
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