[mirror_ubuntu-bionic-kernel.git] / drivers / mtd / maps / tsunami_flash.c

/*
 * tsunami_flash.c
 *
 * flash chip on alpha ds10...
 * $Id: tsunami_flash.c,v 1.10 2005/11/07 11:14:29 gleixner Exp $
 */
#include <asm/io.h>
#include <asm/core_tsunami.h>
#include <linux/init.h>
#include <linux/mtd/map.h>
#include <linux/mtd/mtd.h>

#define FLASH_ENABLE_PORT 0x00C00001
#define FLASH_ENABLE_BYTE 0x01
#define FLASH_DISABLE_BYTE 0x00

#define MAX_TIG_FLASH_SIZE (12*1024*1024)
static inline map_word tsunami_flash_read8(struct map_info *map, unsigned long offset)
{
	map_word val;
	val.x[0] = tsunami_tig_readb(offset);
	return val;
}

static void tsunami_flash_write8(struct map_info *map, map_word value, unsigned long offset)
{
	tsunami_tig_writeb(value.x[0], offset);
}

static void tsunami_flash_copy_from(
	struct map_info *map, void *addr, unsigned long offset, ssize_t len)
{
	unsigned char *dest;
	dest = addr;
	while(len && (offset < MAX_TIG_FLASH_SIZE)) {
		*dest = tsunami_tig_readb(offset);
		offset++;
		dest++;
		len--;
	}
}

static void tsunami_flash_copy_to(
	struct map_info *map, unsigned long offset,
	const void *addr, ssize_t len)
{
	const unsigned char *src;
	src = addr;
	while(len && (offset < MAX_TIG_FLASH_SIZE)) {
		tsunami_tig_writeb(*src, offset);
		offset++;
		src++;
		len--;
	}
}

/*
 * Deliberately don't provide operations wider than 8 bits.  I don't
 * have then and it scares me to think how you could mess up if
 * you tried to use them.   Buswidth is correctly so I'm safe.
 */
static struct map_info tsunami_flash_map = {
	.name = "flash chip on the Tsunami TIG bus",
	.size = MAX_TIG_FLASH_SIZE,
	.phys = NO_XIP,
	.bankwidth = 1,
	.read = tsunami_flash_read8,
	.copy_from = tsunami_flash_copy_from,
	.write = tsunami_flash_write8,
	.copy_to = tsunami_flash_copy_to,
};

static struct mtd_info *tsunami_flash_mtd;

static void __exit  cleanup_tsunami_flash(void)
{
	struct mtd_info *mtd;
	mtd = tsunami_flash_mtd;
	if (mtd) {
		del_mtd_device(mtd);
		map_destroy(mtd);
	}
	tsunami_flash_mtd = 0;
}


static int __init init_tsunami_flash(void)
{
	static const char *rom_probe_types[] = { "cfi_probe", "jedec_probe", "map_rom", NULL };
	char **type;

	tsunami_tig_writeb(FLASH_ENABLE_BYTE, FLASH_ENABLE_PORT);

	tsunami_flash_mtd = 0;
	type = rom_probe_types;
	for(; !tsunami_flash_mtd && *type; type++) {
		tsunami_flash_mtd = do_map_probe(*type, &tsunami_flash_map);
	}
	if (tsunami_flash_mtd) {
		tsunami_flash_mtd->owner = THIS_MODULE;
		add_mtd_device(tsunami_flash_mtd);
		return 0;
	}
	return -ENXIO;
}

module_init(init_tsunami_flash);
module_exit(cleanup_tsunami_flash);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* tsunami_flash.c
	3	*
	4	* flash chip on alpha ds10...
69f34c98	5	* $Id: tsunami_flash.c,v 1.10 2005/11/07 11:14:29 gleixner Exp $
1da177e4 LT	6	*/
	7	#include <asm/io.h>
	8	#include <asm/core_tsunami.h>
	9	#include <linux/init.h>
	10	#include <linux/mtd/map.h>
	11	#include <linux/mtd/mtd.h>
	12
	13	#define FLASH_ENABLE_PORT 0x00C00001
	14	#define FLASH_ENABLE_BYTE 0x01
	15	#define FLASH_DISABLE_BYTE 0x00
	16
	17	#define MAX_TIG_FLASH_SIZE (1210241024)
	18	static inline map_word tsunami_flash_read8(struct map_info *map, unsigned long offset)
	19	{
	20	map_word val;
	21	val.x[0] = tsunami_tig_readb(offset);
	22	return val;
	23	}
	24
	25	static void tsunami_flash_write8(struct map_info *map, map_word value, unsigned long offset)
	26	{
	27	tsunami_tig_writeb(value.x[0], offset);
	28	}
	29
	30	static void tsunami_flash_copy_from(
	31	struct map_info map, void addr, unsigned long offset, ssize_t len)
	32	{
	33	unsigned char *dest;
	34	dest = addr;
	35	while(len && (offset < MAX_TIG_FLASH_SIZE)) {
	36	*dest = tsunami_tig_readb(offset);
	37	offset++;
	38	dest++;
	39	len--;
	40	}
	41	}
	42
	43	static void tsunami_flash_copy_to(
69f34c98	44	struct map_info *map, unsigned long offset,
1da177e4 LT	45	const void *addr, ssize_t len)
	46	{
	47	const unsigned char *src;
	48	src = addr;
	49	while(len && (offset < MAX_TIG_FLASH_SIZE)) {
	50	tsunami_tig_writeb(*src, offset);
	51	offset++;
	52	src++;
	53	len--;
	54	}
	55	}
	56
	57	/*
	58	* Deliberately don't provide operations wider than 8 bits. I don't
	59	* have then and it scares me to think how you could mess up if
	60	* you tried to use them. Buswidth is correctly so I'm safe.
	61	*/
	62	static struct map_info tsunami_flash_map = {
	63	.name = "flash chip on the Tsunami TIG bus",
	64	.size = MAX_TIG_FLASH_SIZE,
70e51015	65	.phys = NO_XIP,
1da177e4 LT	66	.bankwidth = 1,
	67	.read = tsunami_flash_read8,
	68	.copy_from = tsunami_flash_copy_from,
	69	.write = tsunami_flash_write8,
	70	.copy_to = tsunami_flash_copy_to,
	71	};
	72
	73	static struct mtd_info *tsunami_flash_mtd;
	74
	75	static void __exit cleanup_tsunami_flash(void)
	76	{
	77	struct mtd_info *mtd;
	78	mtd = tsunami_flash_mtd;
	79	if (mtd) {
	80	del_mtd_device(mtd);
	81	map_destroy(mtd);
	82	}
	83	tsunami_flash_mtd = 0;
	84	}
	85
	86
	87	static int __init init_tsunami_flash(void)
	88	{
	89	static const char *rom_probe_types[] = { "cfi_probe", "jedec_probe", "map_rom", NULL };
	90	char **type;
	91
	92	tsunami_tig_writeb(FLASH_ENABLE_BYTE, FLASH_ENABLE_PORT);
69f34c98	93
1da177e4 LT	94	tsunami_flash_mtd = 0;
	95	type = rom_probe_types;
	96	for(; !tsunami_flash_mtd && *type; type++) {
	97	tsunami_flash_mtd = do_map_probe(*type, &tsunami_flash_map);
	98	}
	99	if (tsunami_flash_mtd) {
	100	tsunami_flash_mtd->owner = THIS_MODULE;
	101	add_mtd_device(tsunami_flash_mtd);
	102	return 0;
	103	}
	104	return -ENXIO;
	105	}
	106
	107	module_init(init_tsunami_flash);
	108	module_exit(cleanup_tsunami_flash);