[PATCH v7 2/7] omap3: nand: configurable transfer type per board
Sukumar Ghorai
s-ghorai at ti.com
Wed Dec 29 08:32:21 EST 2010
nand transfer type (sDMA, Polled, prefetch) can be select from board file,
enabling all transfer type in driver, by default.
this helps in multi-omap build and to select different transfer type for
different board.
Signed-off-by: Sukumar Ghorai <s-ghorai at ti.com>
---
arch/arm/plat-omap/include/plat/nand.h | 7 +++
drivers/mtd/nand/Kconfig | 17 ------
drivers/mtd/nand/omap2.c | 92 +++++++++++--------------------
3 files changed, 40 insertions(+), 76 deletions(-)
diff --git a/arch/arm/plat-omap/include/plat/nand.h b/arch/arm/plat-omap/include/plat/nand.h
index 6562cd0..78c0bdb 100644
--- a/arch/arm/plat-omap/include/plat/nand.h
+++ b/arch/arm/plat-omap/include/plat/nand.h
@@ -10,6 +10,12 @@
#include <linux/mtd/partitions.h>
+enum nand_io {
+ NAND_OMAP_PREFETCH_POLLED = 0, /* prefetch polled mode, default */
+ NAND_OMAP_POLLED, /* polled mode, without prefetch */
+ NAND_OMAP_PREFETCH_DMA /* prefetch enabled sDMA mode */
+};
+
struct omap_nand_platform_data {
unsigned int options;
int cs;
@@ -20,6 +26,7 @@ struct omap_nand_platform_data {
int (*nand_setup)(void);
int (*dev_ready)(struct omap_nand_platform_data *);
int dma_channel;
+ enum nand_io xfer_type;
unsigned long phys_base;
int devsize;
};
diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig
index 8229802..89bb297 100644
--- a/drivers/mtd/nand/Kconfig
+++ b/drivers/mtd/nand/Kconfig
@@ -105,23 +105,6 @@ config MTD_NAND_OMAP2
help
Support for NAND flash on Texas Instruments OMAP2 and OMAP3 platforms.
-config MTD_NAND_OMAP_PREFETCH
- bool "GPMC prefetch support for NAND Flash device"
- depends on MTD_NAND_OMAP2
- default y
- help
- The NAND device can be accessed for Read/Write using GPMC PREFETCH engine
- to improve the performance.
-
-config MTD_NAND_OMAP_PREFETCH_DMA
- depends on MTD_NAND_OMAP_PREFETCH
- bool "DMA mode"
- default n
- help
- The GPMC PREFETCH engine can be configured eigther in MPU interrupt mode
- or in DMA interrupt mode.
- Say y for DMA mode or MPU mode will be used
-
config MTD_NAND_IDS
tristate
diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index 7c04cd6..66b7428 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -96,27 +96,6 @@
static const char *part_probes[] = { "cmdlinepart", NULL };
#endif
-#ifdef CONFIG_MTD_NAND_OMAP_PREFETCH
-static int use_prefetch = 1;
-
-/* "modprobe ... use_prefetch=0" etc */
-module_param(use_prefetch, bool, 0);
-MODULE_PARM_DESC(use_prefetch, "enable/disable use of PREFETCH");
-
-#ifdef CONFIG_MTD_NAND_OMAP_PREFETCH_DMA
-static int use_dma = 1;
-
-/* "modprobe ... use_dma=0" etc */
-module_param(use_dma, bool, 0);
-MODULE_PARM_DESC(use_dma, "enable/disable use of DMA");
-#else
-static const int use_dma;
-#endif
-#else
-const int use_prefetch;
-static const int use_dma;
-#endif
-
struct omap_nand_info {
struct nand_hw_control controller;
struct omap_nand_platform_data *pdata;
@@ -324,7 +303,6 @@ static void omap_write_buf_pref(struct mtd_info *mtd,
}
}
-#ifdef CONFIG_MTD_NAND_OMAP_PREFETCH_DMA
/*
* omap_nand_dma_cb: callback on the completion of dma transfer
* @lch: logical channel
@@ -426,14 +404,6 @@ out_copy:
: omap_write_buf8(mtd, (u_char *) addr, len);
return 0;
}
-#else
-static void omap_nand_dma_cb(int lch, u16 ch_status, void *data) {}
-static inline int omap_nand_dma_transfer(struct mtd_info *mtd, void *addr,
- unsigned int len, int is_write)
-{
- return 0;
-}
-#endif
/**
* omap_read_buf_dma_pref - read data from NAND controller into buffer
@@ -842,28 +812,13 @@ static int __devinit omap_nand_probe(struct platform_device *pdev)
info->nand.chip_delay = 50;
}
- if (use_prefetch) {
-
+ switch (pdata->xfer_type) {
+ case NAND_OMAP_PREFETCH_POLLED:
info->nand.read_buf = omap_read_buf_pref;
info->nand.write_buf = omap_write_buf_pref;
- if (use_dma) {
- err = omap_request_dma(OMAP24XX_DMA_GPMC, "NAND",
- omap_nand_dma_cb, &info->comp, &info->dma_ch);
- if (err < 0) {
- info->dma_ch = -1;
- printk(KERN_WARNING "DMA request failed."
- " Non-dma data transfer mode\n");
- } else {
- omap_set_dma_dest_burst_mode(info->dma_ch,
- OMAP_DMA_DATA_BURST_16);
- omap_set_dma_src_burst_mode(info->dma_ch,
- OMAP_DMA_DATA_BURST_16);
-
- info->nand.read_buf = omap_read_buf_dma_pref;
- info->nand.write_buf = omap_write_buf_dma_pref;
- }
- }
- } else {
+ break;
+
+ case NAND_OMAP_POLLED:
if (info->nand.options & NAND_BUSWIDTH_16) {
info->nand.read_buf = omap_read_buf16;
info->nand.write_buf = omap_write_buf16;
@@ -871,7 +826,33 @@ static int __devinit omap_nand_probe(struct platform_device *pdev)
info->nand.read_buf = omap_read_buf8;
info->nand.write_buf = omap_write_buf8;
}
+ break;
+
+ case NAND_OMAP_PREFETCH_DMA:
+ err = omap_request_dma(OMAP24XX_DMA_GPMC, "NAND",
+ omap_nand_dma_cb, &info->comp, &info->dma_ch);
+ if (err < 0) {
+ info->dma_ch = -1;
+ dev_err(&pdev->dev, "DMA request failed!\n");
+ goto out_release_mem_region;
+ } else {
+ omap_set_dma_dest_burst_mode(info->dma_ch,
+ OMAP_DMA_DATA_BURST_16);
+ omap_set_dma_src_burst_mode(info->dma_ch,
+ OMAP_DMA_DATA_BURST_16);
+
+ info->nand.read_buf = omap_read_buf_dma_pref;
+ info->nand.write_buf = omap_write_buf_dma_pref;
+ }
+ break;
+
+ default:
+ dev_err(&pdev->dev,
+ "xfer_type(%d) not supported!\n", pdata->xfer_type);
+ err = -EINVAL;
+ goto out_release_mem_region;
}
+
info->nand.verify_buf = omap_verify_buf;
#ifdef CONFIG_MTD_NAND_OMAP_HWECC
@@ -897,6 +878,7 @@ static int __devinit omap_nand_probe(struct platform_device *pdev)
}
}
+
#ifdef CONFIG_MTD_PARTITIONS
err = parse_mtd_partitions(&info->mtd, part_probes, &info->parts, 0);
if (err > 0)
@@ -926,7 +908,7 @@ static int omap_nand_remove(struct platform_device *pdev)
mtd);
platform_set_drvdata(pdev, NULL);
- if (use_dma)
+ if (info->dma_ch != -1)
omap_free_dma(info->dma_ch);
/* Release NAND device, its internal structures and partitions */
@@ -949,14 +931,6 @@ static int __init omap_nand_init(void)
{
printk(KERN_INFO "%s driver initializing\n", DRIVER_NAME);
- /* This check is required if driver is being
- * loaded run time as a module
- */
- if ((1 == use_dma) && (0 == use_prefetch)) {
- printk(KERN_INFO"Wrong parameters: 'use_dma' can not be 1 "
- "without use_prefetch'. Prefetch will not be"
- " used in either mode (mpu or dma)\n");
- }
return platform_driver_register(&omap_nand_driver);
}
--
1.7.0.4
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