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mtd: maps: physmap: Add reference counter to set_vpp()

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This patch is part of a set which fixes unnecessary flash erase and write errors
resulting from the MTD CFI driver turning off vpp while an erase is in progress.
This patch allows physmap_set_vpp() calls to be nested by adding a reference
counter.

omap1_set_vpp() already used a reference counter. Since it is called from
physmap_set_vpp(), omap1_set_vpp() can now be simplified.

simtec_nor_vpp() already disabled hard interrupts. Since it is called from
physmap_set_vpp(), simtec_nor_vpp() can now be simplified.

Signed-off-by: Paul Parsons <lost.distance@yahoo.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Paul Parsons 2012-03-07 14:12:08 +00:00 committed by David Woodhouse
parent e7d9377e04
commit 876fe76d79
3 changed files with 26 additions and 19 deletions
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20
arch/arm/mach-omap1/flash.c
View File

@ -15,20 +15,12 @@
void omap1_set_vpp(struct platform_device *pdev, int enable)
{
static int count;
u32 l;
if (enable) {
if (count++ == 0) {
l = omap_readl(EMIFS_CONFIG);
l |= OMAP_EMIFS_CONFIG_WP;
omap_writel(l, EMIFS_CONFIG);
}
} else {
if (count && (--count == 0)) {
l = omap_readl(EMIFS_CONFIG);
l &= ~OMAP_EMIFS_CONFIG_WP;
omap_writel(l, EMIFS_CONFIG);
}
}
l = omap_readl(EMIFS_CONFIG);
if (enable)
l |= OMAP_EMIFS_CONFIG_WP;
else
l &= ~OMAP_EMIFS_CONFIG_WP;
omap_writel(l, EMIFS_CONFIG);
}

3
arch/arm/mach-s3c2410/nor-simtec.c
View File

@ -35,9 +35,7 @@
static void simtec_nor_vpp(struct platform_device *pdev, int vpp)
{
unsigned int val;
unsigned long flags;
local_irq_save(flags);
val = __raw_readb(BAST_VA_CTRL3);
printk(KERN_DEBUG "%s(%d)\n", __func__, vpp);
@ -48,7 +46,6 @@ static void simtec_nor_vpp(struct platform_device *pdev, int vpp)
val &= ~BAST_CPLD_CTRL3_ROMWEN;
__raw_writeb(val, BAST_VA_CTRL3);
local_irq_restore(flags);
}
static struct physmap_flash_data simtec_nor_pdata = {

22
drivers/mtd/maps/physmap.c
View File

@ -27,6 +27,8 @@ struct physmap_flash_info {
struct mtd_info *mtd[MAX_RESOURCES];
struct mtd_info *cmtd;
struct map_info map[MAX_RESOURCES];
spinlock_t vpp_lock;
int vpp_refcnt;
};
static int physmap_flash_remove(struct platform_device *dev)
@ -63,12 +65,26 @@ static void physmap_set_vpp(struct map_info *map, int state)
{
struct platform_device *pdev;
struct physmap_flash_data *physmap_data;
struct physmap_flash_info *info;
unsigned long flags;
pdev = (struct platform_device *)map->map_priv_1;
physmap_data = pdev->dev.platform_data;
if (physmap_data->set_vpp)
physmap_data->set_vpp(pdev, state);
if (!physmap_data->set_vpp)
return;
info = platform_get_drvdata(pdev);
spin_lock_irqsave(&info->vpp_lock, flags);
if (state) {
if (++info->vpp_refcnt == 1) /* first nested 'on' */
physmap_data->set_vpp(pdev, 1);
} else {
if (--info->vpp_refcnt == 0) /* last nested 'off' */
physmap_data->set_vpp(pdev, 0);
}
spin_unlock_irqrestore(&info->vpp_lock, flags);
}
static const char *rom_probe_types[] = {
@ -172,6 +188,8 @@ static int physmap_flash_probe(struct platform_device *dev)
if (err)
goto err_out;
spin_lock_init(&info->vpp_lock);
part_types = physmap_data->part_probe_types ? : part_probe_types;
mtd_device_parse_register(info->cmtd, part_types, 0,