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mtd: OneNAND: OMAP2/3: prevent regulator sleeping while OneNAND is in use

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Prevent OneNAND's voltage regulator from going to sleep while
OneNAND is in use, by explicitly enabling and disabling the
regulator as appropriate.

Signed-off-by: Adrian Hunter <adrian.hunter@nokia.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Adrian Hunter 2010-02-19 15:39:53 +01:00 committed by David Woodhouse
parent cf24dc85ff
commit 9ac4e613a8
2 changed files with 41 additions and 1 deletions
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1
arch/arm/plat-omap/include/plat/onenand.h
View file

@ -23,6 +23,7 @@ struct omap_onenand_platform_data {
int (*onenand_setup)(void __iomem *, int freq);
int dma_channel;
u8 flags;
u8 regulator_can_sleep;
};
#define ONENAND_MAX_PARTITIONS 8

41
drivers/mtd/onenand/omap2.c
View file

@ -35,6 +35,7 @@
#include <linux/dma-mapping.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/regulator/consumer.h>
#include <asm/mach/flash.h>
#include <plat/gpmc.h>
@ -63,6 +64,7 @@ struct omap2_onenand {
int dma_channel;
int freq;
int (*setup)(void __iomem *base, int freq);
struct regulator *regulator;
};
#ifdef CONFIG_MTD_PARTITIONS
@ -601,6 +603,30 @@ static void omap2_onenand_shutdown(struct platform_device *pdev)
memset((__force void *)c->onenand.base, 0, ONENAND_BUFRAM_SIZE);
}
static int omap2_onenand_enable(struct mtd_info *mtd)
{
int ret;
struct omap2_onenand *c = container_of(mtd, struct omap2_onenand, mtd);
ret = regulator_enable(c->regulator);
if (ret != 0)
dev_err(&c->pdev->dev, "cant enable regulator\n");
return ret;
}
static int omap2_onenand_disable(struct mtd_info *mtd)
{
int ret;
struct omap2_onenand *c = container_of(mtd, struct omap2_onenand, mtd);
ret = regulator_disable(c->regulator);
if (ret != 0)
dev_err(&c->pdev->dev, "cant disable regulator\n");
return ret;
}
static int __devinit omap2_onenand_probe(struct platform_device *pdev)
{
struct omap_onenand_platform_data *pdata;
@ -715,8 +741,18 @@ static int __devinit omap2_onenand_probe(struct platform_device *pdev)
}
}
if (pdata->regulator_can_sleep) {
c->regulator = regulator_get(&pdev->dev, "vonenand");
if (IS_ERR(c->regulator)) {
dev_err(&pdev->dev, "Failed to get regulator\n");
goto err_release_dma;
}
c->onenand.enable = omap2_onenand_enable;
c->onenand.disable = omap2_onenand_disable;
}
if ((r = onenand_scan(&c->mtd, 1)) < 0)
goto err_release_dma;
goto err_release_regulator;
switch ((c->onenand.version_id >> 4) & 0xf) {
case 0:
@ -751,6 +787,8 @@ static int __devinit omap2_onenand_probe(struct platform_device *pdev)
err_release_onenand:
onenand_release(&c->mtd);
err_release_regulator:
regulator_put(c->regulator);
err_release_dma:
if (c->dma_channel != -1)
omap_free_dma(c->dma_channel);
@ -777,6 +815,7 @@ static int __devexit omap2_onenand_remove(struct platform_device *pdev)
struct omap2_onenand *c = dev_get_drvdata(&pdev->dev);
onenand_release(&c->mtd);
regulator_put(c->regulator);
if (c->dma_channel != -1)
omap_free_dma(c->dma_channel);
omap2_onenand_shutdown(pdev);