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mtd: nand: omap2: Implement NAND ready using gpiolib

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The GPMC WAIT pin status are now available over gpiolib.
Update the omap_dev_ready() function to use gpio instead of
directly accessing GPMC register space.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Acked-by: Brian Norris <computersforpeace@gmail.com>
Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Acked-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Roger Quadros
2015-08-06 17:39:35 +03:00
parent 9e6946215d
commit 10f22ee367
3 changed files with 21 additions and 12 deletions
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29
drivers/mtd/nand/omap2.c
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@@ -12,6 +12,7 @@
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/jiffies.h>
@@ -182,6 +183,8 @@ struct omap_nand_info {
struct nand_ecclayout oobinfo;
/* fields specific for BCHx_HW ECC scheme */
struct device *elm_dev;
/* NAND ready gpio */
struct gpio_desc *ready_gpiod;
};
static inline struct omap_nand_info *mtd_to_omap(struct mtd_info *mtd)
@@ -1023,21 +1026,16 @@ static int omap_wait(struct mtd_info *mtd, struct nand_chip *chip)
}
/**
* omap_dev_ready - calls the platform specific dev_ready function
* omap_dev_ready - checks the NAND Ready GPIO line
* @mtd: MTD device structure
*
* Returns true if ready and false if busy.
*/
static int omap_dev_ready(struct mtd_info *mtd)
{
unsigned int val = 0;
struct omap_nand_info *info = mtd_to_omap(mtd);
val = readl(info->reg.gpmc_status);
if ((val & 0x100) == 0x100) {
return 1;
} else {
return 0;
}
return gpiod_get_value(info->ready_gpiod);
}
/**
@@ -1755,7 +1753,9 @@ static int omap_nand_probe(struct platform_device *pdev)
info->gpmc_cs = pdata->cs;
info->reg = pdata->reg;
info->ecc_opt = pdata->ecc_opt;
info->dev_ready = pdata->dev_ready;
if (pdata->dev_ready)
dev_info(&pdev->dev, "pdata->dev_ready is deprecated\n");
info->xfer_type = pdata->xfer_type;
info->devsize = pdata->devsize;
info->elm_of_node = pdata->elm_of_node;
@@ -1787,6 +1787,13 @@ static int omap_nand_probe(struct platform_device *pdev)
nand_chip->IO_ADDR_W = nand_chip->IO_ADDR_R;
nand_chip->cmd_ctrl = omap_hwcontrol;
info->ready_gpiod = devm_gpiod_get_optional(&pdev->dev, "rb",
GPIOD_IN);
if (IS_ERR(info->ready_gpiod)) {
dev_err(dev, "failed to get ready gpio\n");
return PTR_ERR(info->ready_gpiod);
}
/*
* If RDY/BSY line is connected to OMAP then use the omap ready
* function and the generic nand_wait function which reads the status
@@ -1794,7 +1801,7 @@ static int omap_nand_probe(struct platform_device *pdev)
* chip delay which is slightly more than tR (AC Timing) of the NAND
* device and read status register until you get a failure or success
*/
if (info->dev_ready) {
if (info->ready_gpiod) {
nand_chip->dev_ready = omap_dev_ready;
nand_chip->chip_delay = 0;
} else {