Commit 876fe76d authored by Paul Parsons's avatar Paul Parsons Committed by David Woodhouse
Browse files

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



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: default avatarPaul Parsons <lost.distance@yahoo.com>
Signed-off-by: default avatarArtem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: default avatarDavid Woodhouse <David.Woodhouse@intel.com>
parent e7d9377e

arch/arm/mach-omap1/flash.c

+6 −14
Original line number Diff line number Diff line
@@ -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);

	if (enable)

		l |= OMAP_EMIFS_CONFIG_WP;

			omap_writel(l, EMIFS_CONFIG);

		}

	} else {

		if (count && (--count == 0)) {

			l = omap_readl(EMIFS_CONFIG);

	else

		l &= ~OMAP_EMIFS_CONFIG_WP;

	omap_writel(l, EMIFS_CONFIG);

}
 
	}

}

arch/arm/mach-s3c2410/nor-simtec.c

+0 −3
Original line number Diff line number Diff line
@@ -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 = {

drivers/mtd/maps/physmap.c

+20 −2
Original line number Diff line number Diff line
@@ -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,

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