mtd: nand: omap2: obtain memory from resource

gpmc initialization done by platform code now updates struct resource
with the address space alloted for nand. Use this interface to obtain
memory rather than relying on platform data field - phys_base.
Signed-off-by: NAfzal Mohammed <afzal@ti.com>
Acked-by: NArtem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>

arch/arm/plat-omap/include/plat/nand.h

@@ -26,7 +26,6 @@ struct omap_nand_platform_data {
 	bool			dev_ready;
 	int			gpmc_irq;
 	enum nand_io		xfer_type;
-	unsigned long		phys_base;
 	int			devsize;
 	enum omap_ecc           ecc_opt;
 	struct gpmc_nand_regs	reg;

drivers/mtd/nand/omap2.c

@@ -134,6 +134,7 @@ struct omap_nand_info {
 
 	int				gpmc_cs;
 	unsigned long			phys_base;
+	unsigned long			mem_size;
 	struct completion		comp;
 	struct dma_chan			*dma;
 	int				gpmc_irq;
@@ -1270,6 +1271,7 @@ static int __devinit omap_nand_probe(struct platform_device *pdev)
 	int				i, offset;
 	dma_cap_mask_t mask;
 	unsigned sig;
+	struct resource			*res;
 
 	pdata = pdev->dev.platform_data;
 	if (pdata == NULL) {
@@ -1289,7 +1291,6 @@ static int __devinit omap_nand_probe(struct platform_device *pdev)
 	info->pdev = pdev;
 
 	info->gpmc_cs		= pdata->cs;
-	info->phys_base		= pdata->phys_base;
 	info->reg		= pdata->reg;
 
 	info->mtd.priv		= &info->nand;
@@ -1302,13 +1303,23 @@ static int __devinit omap_nand_probe(struct platform_device *pdev)
 	/* NAND write protect off */
 	gpmc_cs_configure(info->gpmc_cs, GPMC_CONFIG_WP, 0);
 
-	if (!request_mem_region(info->phys_base, NAND_IO_SIZE,
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (res == NULL) {
+		err = -EINVAL;
+		dev_err(&pdev->dev, "error getting memory resource\n");
+		goto out_free_info;
+	}
+
+	info->phys_base = res->start;
+	info->mem_size = resource_size(res);
+
+	if (!request_mem_region(info->phys_base, info->mem_size,
 				pdev->dev.driver->name)) {
 		err = -EBUSY;
 		goto out_free_info;
 	}
 
-	info->nand.IO_ADDR_R = ioremap(info->phys_base, NAND_IO_SIZE);
+	info->nand.IO_ADDR_R = ioremap(info->phys_base, info->mem_size);
 	if (!info->nand.IO_ADDR_R) {
 		err = -ENOMEM;
 		goto out_release_mem_region;
@@ -1479,7 +1490,7 @@ static int __devinit omap_nand_probe(struct platform_device *pdev)
 out_release_mem_region:
 	if (info->dma)
 		dma_release_channel(info->dma);
-	release_mem_region(info->phys_base, NAND_IO_SIZE);
+	release_mem_region(info->phys_base, info->mem_size);
 out_free_info:
 	kfree(info);