[linux-2.6-block.git] / drivers / mtd / maps / pxa2xx-flash.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Map driver for Intel XScale PXA2xx platforms.
 *
 * Author:	Nicolas Pitre
 * Copyright:	(C) 2001 MontaVista Software Inc.
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>

#include <asm/io.h>
#include <asm/mach/flash.h>

#define CACHELINESIZE	32

static void pxa2xx_map_inval_cache(struct map_info *map, unsigned long from,
				      ssize_t len)
{
	unsigned long start = (unsigned long)map->cached + from;
	unsigned long end = start + len;

	start &= ~(CACHELINESIZE - 1);
	while (start < end) {
		/* invalidate D cache line */
		asm volatile ("mcr p15, 0, %0, c7, c6, 1" : : "r" (start));
		start += CACHELINESIZE;
	}
}

struct pxa2xx_flash_info {
	struct mtd_info		*mtd;
	struct map_info		map;
};

static const char * const probes[] = { "RedBoot", "cmdlinepart", NULL };

static int pxa2xx_flash_probe(struct platform_device *pdev)
{
	struct flash_platform_data *flash = dev_get_platdata(&pdev->dev);
	struct pxa2xx_flash_info *info;
	struct resource *res;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res)
		return -ENODEV;

	info = kzalloc(sizeof(struct pxa2xx_flash_info), GFP_KERNEL);
	if (!info)
		return -ENOMEM;

	info->map.name = flash->name;
	info->map.bankwidth = flash->width;
	info->map.phys = res->start;
	info->map.size = resource_size(res);

	info->map.virt = ioremap(info->map.phys, info->map.size);
	if (!info->map.virt) {
		printk(KERN_WARNING "Failed to ioremap %s\n",
		       info->map.name);
		kfree(info);
		return -ENOMEM;
	}
	info->map.cached = ioremap_cache(info->map.phys, info->map.size);
	if (!info->map.cached)
		printk(KERN_WARNING "Failed to ioremap cached %s\n",
		       info->map.name);
	info->map.inval_cache = pxa2xx_map_inval_cache;
	simple_map_init(&info->map);

	printk(KERN_NOTICE
	       "Probing %s at physical address 0x%08lx"
	       " (%d-bit bankwidth)\n",
	       info->map.name, (unsigned long)info->map.phys,
	       info->map.bankwidth * 8);

	info->mtd = do_map_probe(flash->map_name, &info->map);

	if (!info->mtd) {
		iounmap((void *)info->map.virt);
		if (info->map.cached)
			iounmap(info->map.cached);
		kfree(info);
		return -EIO;
	}
	info->mtd->dev.parent = &pdev->dev;

	mtd_device_parse_register(info->mtd, probes, NULL, flash->parts,
				  flash->nr_parts);

	platform_set_drvdata(pdev, info);
	return 0;
}

static void pxa2xx_flash_remove(struct platform_device *dev)
{
	struct pxa2xx_flash_info *info = platform_get_drvdata(dev);

	mtd_device_unregister(info->mtd);

	map_destroy(info->mtd);
	iounmap(info->map.virt);
	if (info->map.cached)
		iounmap(info->map.cached);
	kfree(info);
}

#ifdef CONFIG_PM
static void pxa2xx_flash_shutdown(struct platform_device *dev)
{
	struct pxa2xx_flash_info *info = platform_get_drvdata(dev);

	if (info && mtd_suspend(info->mtd) == 0)
		mtd_resume(info->mtd);
}
#else
#define pxa2xx_flash_shutdown NULL
#endif

static struct platform_driver pxa2xx_flash_driver = {
	.driver = {
		.name		= "pxa2xx-flash",
	},
	.probe		= pxa2xx_flash_probe,
	.remove		= pxa2xx_flash_remove,
	.shutdown	= pxa2xx_flash_shutdown,
};

module_platform_driver(pxa2xx_flash_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Nicolas Pitre <nico@fluxnic.net>");
MODULE_DESCRIPTION("MTD map driver for Intel XScale PXA2xx");
Commit	Line	Data
	1	// SPDX-License-Identifier: GPL-2.0-only
	2	/*
	3	* Map driver for Intel XScale PXA2xx platforms.
	4	*
	5	* Author: Nicolas Pitre
	6	* Copyright: (C) 2001 MontaVista Software Inc.
	7	*/
	8
	9	#include <linux/module.h>
	10	#include <linux/types.h>
	11	#include <linux/slab.h>
	12	#include <linux/kernel.h>
	13	#include <linux/platform_device.h>
	14	#include <linux/mtd/mtd.h>
	15	#include <linux/mtd/map.h>
	16	#include <linux/mtd/partitions.h>
	17
	18	#include <asm/io.h>
	19	#include <asm/mach/flash.h>
	20
	21	#define CACHELINESIZE 32
	22
	23	static void pxa2xx_map_inval_cache(struct map_info *map, unsigned long from,
	24	ssize_t len)
	25	{
	26	unsigned long start = (unsigned long)map->cached + from;
	27	unsigned long end = start + len;
	28
	29	start &= ~(CACHELINESIZE - 1);
	30	while (start < end) {
	31	/* invalidate D cache line */
	32	asm volatile ("mcr p15, 0, %0, c7, c6, 1" : : "r" (start));
	33	start += CACHELINESIZE;
	34	}
	35	}
	36
	37	struct pxa2xx_flash_info {
	38	struct mtd_info *mtd;
	39	struct map_info map;
	40	};
	41
	42	static const char * const probes[] = { "RedBoot", "cmdlinepart", NULL };
	43
	44	static int pxa2xx_flash_probe(struct platform_device *pdev)
	45	{
	46	struct flash_platform_data *flash = dev_get_platdata(&pdev->dev);
	47	struct pxa2xx_flash_info *info;
	48	struct resource *res;
	49
	50	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	51	if (!res)
	52	return -ENODEV;
	53
	54	info = kzalloc(sizeof(struct pxa2xx_flash_info), GFP_KERNEL);
	55	if (!info)
	56	return -ENOMEM;
	57
	58	info->map.name = flash->name;
	59	info->map.bankwidth = flash->width;
	60	info->map.phys = res->start;
	61	info->map.size = resource_size(res);
	62
	63	info->map.virt = ioremap(info->map.phys, info->map.size);
	64	if (!info->map.virt) {
	65	printk(KERN_WARNING "Failed to ioremap %s\n",
	66	info->map.name);
	67	kfree(info);
	68	return -ENOMEM;
	69	}
	70	info->map.cached = ioremap_cache(info->map.phys, info->map.size);
	71	if (!info->map.cached)
	72	printk(KERN_WARNING "Failed to ioremap cached %s\n",
	73	info->map.name);
	74	info->map.inval_cache = pxa2xx_map_inval_cache;
	75	simple_map_init(&info->map);
	76
	77	printk(KERN_NOTICE
	78	"Probing %s at physical address 0x%08lx"
	79	" (%d-bit bankwidth)\n",
	80	info->map.name, (unsigned long)info->map.phys,
	81	info->map.bankwidth * 8);
	82
	83	info->mtd = do_map_probe(flash->map_name, &info->map);
	84
	85	if (!info->mtd) {
	86	iounmap((void *)info->map.virt);
	87	if (info->map.cached)
	88	iounmap(info->map.cached);
	89	kfree(info);
	90	return -EIO;
	91	}
	92	info->mtd->dev.parent = &pdev->dev;
	93
	94	mtd_device_parse_register(info->mtd, probes, NULL, flash->parts,
	95	flash->nr_parts);
	96
	97	platform_set_drvdata(pdev, info);
	98	return 0;
	99	}
	100
	101	static void pxa2xx_flash_remove(struct platform_device *dev)
	102	{
	103	struct pxa2xx_flash_info *info = platform_get_drvdata(dev);
	104
	105	mtd_device_unregister(info->mtd);
	106
	107	map_destroy(info->mtd);
	108	iounmap(info->map.virt);
	109	if (info->map.cached)
	110	iounmap(info->map.cached);
	111	kfree(info);
	112	}
	113
	114	#ifdef CONFIG_PM
	115	static void pxa2xx_flash_shutdown(struct platform_device *dev)
	116	{
	117	struct pxa2xx_flash_info *info = platform_get_drvdata(dev);
	118
	119	if (info && mtd_suspend(info->mtd) == 0)
	120	mtd_resume(info->mtd);
	121	}
	122	#else
	123	#define pxa2xx_flash_shutdown NULL
	124	#endif
	125
	126	static struct platform_driver pxa2xx_flash_driver = {
	127	.driver = {
	128	.name = "pxa2xx-flash",
	129	},
	130	.probe = pxa2xx_flash_probe,
	131	.remove = pxa2xx_flash_remove,
	132	.shutdown = pxa2xx_flash_shutdown,
	133	};
	134
	135	module_platform_driver(pxa2xx_flash_driver);
	136
	137	MODULE_LICENSE("GPL");
	138	MODULE_AUTHOR("Nicolas Pitre <nico@fluxnic.net>");
	139	MODULE_DESCRIPTION("MTD map driver for Intel XScale PXA2xx");