[net-next-2.6.git] / drivers / mtd / maps / bfin-async-flash.c

/*
 * drivers/mtd/maps/bfin-async-flash.c
 *
 * Handle the case where flash memory and ethernet mac/phy are
 * mapped onto the same async bank.  The BF533-STAMP does this
 * for example.  All board-specific configuration goes in your
 * board resources file.
 *
 * Copyright 2000 Nicolas Pitre <nico@fluxnic.net>
 * Copyright 2005-2008 Analog Devices Inc.
 *
 * Enter bugs at http://blackfin.uclinux.org/
 *
 * Licensed under the GPL-2 or later.
 */

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

#include <asm/blackfin.h>
#include <linux/gpio.h>
#include <linux/io.h>
#include <asm/unaligned.h>

#define pr_devinit(fmt, args...) ({ static const __devinitconst char __fmt[] = fmt; printk(__fmt, ## args); })

#define DRIVER_NAME "bfin-async-flash"

struct async_state {
	struct mtd_info *mtd;
	struct map_info map;
	int enet_flash_pin;
	uint32_t flash_ambctl0, flash_ambctl1;
	uint32_t save_ambctl0, save_ambctl1;
	unsigned long irq_flags;
#ifdef CONFIG_MTD_PARTITIONS
	struct mtd_partition *parts;
#endif
};

static void switch_to_flash(struct async_state *state)
{
	local_irq_save(state->irq_flags);

	gpio_set_value(state->enet_flash_pin, 0);

	state->save_ambctl0 = bfin_read_EBIU_AMBCTL0();
	state->save_ambctl1 = bfin_read_EBIU_AMBCTL1();
	bfin_write_EBIU_AMBCTL0(state->flash_ambctl0);
	bfin_write_EBIU_AMBCTL1(state->flash_ambctl1);
	SSYNC();
}

static void switch_back(struct async_state *state)
{
	bfin_write_EBIU_AMBCTL0(state->save_ambctl0);
	bfin_write_EBIU_AMBCTL1(state->save_ambctl1);
	SSYNC();

	gpio_set_value(state->enet_flash_pin, 1);

	local_irq_restore(state->irq_flags);
}

static map_word bfin_read(struct map_info *map, unsigned long ofs)
{
	struct async_state *state = (struct async_state *)map->map_priv_1;
	uint16_t word;
	map_word test;

	switch_to_flash(state);

	word = readw(map->virt + ofs);

	switch_back(state);

	test.x[0] = word;
	return test;
}

static void bfin_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
{
	struct async_state *state = (struct async_state *)map->map_priv_1;

	switch_to_flash(state);

	memcpy(to, map->virt + from, len);

	switch_back(state);
}

static void bfin_write(struct map_info *map, map_word d1, unsigned long ofs)
{
	struct async_state *state = (struct async_state *)map->map_priv_1;
	uint16_t d;

	d = d1.x[0];

	switch_to_flash(state);

	writew(d, map->virt + ofs);
	SSYNC();

	switch_back(state);
}

static void bfin_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
{
	struct async_state *state = (struct async_state *)map->map_priv_1;

	switch_to_flash(state);

	memcpy(map->virt + to, from, len);
	SSYNC();

	switch_back(state);
}

#ifdef CONFIG_MTD_PARTITIONS
static const char *part_probe_types[] = { "cmdlinepart", "RedBoot", NULL };
#endif

static int __devinit bfin_flash_probe(struct platform_device *pdev)
{
	int ret;
	struct physmap_flash_data *pdata = pdev->dev.platform_data;
	struct resource *memory = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	struct resource *flash_ambctl = platform_get_resource(pdev, IORESOURCE_MEM, 1);
	struct async_state *state;

	state = kzalloc(sizeof(*state), GFP_KERNEL);
	if (!state)
		return -ENOMEM;

	state->map.name       = DRIVER_NAME;
	state->map.read       = bfin_read;
	state->map.copy_from  = bfin_copy_from;
	state->map.write      = bfin_write;
	state->map.copy_to    = bfin_copy_to;
	state->map.bankwidth  = pdata->width;
	state->map.size       = memory->end - memory->start + 1;
	state->map.virt       = (void __iomem *)memory->start;
	state->map.phys       = memory->start;
	state->map.map_priv_1 = (unsigned long)state;
	state->enet_flash_pin = platform_get_irq(pdev, 0);
	state->flash_ambctl0  = flash_ambctl->start;
	state->flash_ambctl1  = flash_ambctl->end;

	if (gpio_request(state->enet_flash_pin, DRIVER_NAME)) {
		pr_devinit(KERN_ERR DRIVER_NAME ": Failed to request gpio %d\n", state->enet_flash_pin);
		kfree(state);
		return -EBUSY;
	}
	gpio_direction_output(state->enet_flash_pin, 1);

	pr_devinit(KERN_NOTICE DRIVER_NAME ": probing %d-bit flash bus\n", state->map.bankwidth * 8);
	state->mtd = do_map_probe(memory->name, &state->map);
	if (!state->mtd) {
		gpio_free(state->enet_flash_pin);
		kfree(state);
		return -ENXIO;
	}

#ifdef CONFIG_MTD_PARTITIONS
	ret = parse_mtd_partitions(state->mtd, part_probe_types, &pdata->parts, 0);
	if (ret > 0) {
		pr_devinit(KERN_NOTICE DRIVER_NAME ": Using commandline partition definition\n");
		add_mtd_partitions(state->mtd, pdata->parts, ret);
		state->parts = pdata->parts;

	} else if (pdata->nr_parts) {
		pr_devinit(KERN_NOTICE DRIVER_NAME ": Using board partition definition\n");
		add_mtd_partitions(state->mtd, pdata->parts, pdata->nr_parts);

	} else
#endif
	{
		pr_devinit(KERN_NOTICE DRIVER_NAME ": no partition info available, registering whole flash at once\n");
		add_mtd_device(state->mtd);
	}

	platform_set_drvdata(pdev, state);

	return 0;
}

static int __devexit bfin_flash_remove(struct platform_device *pdev)
{
	struct async_state *state = platform_get_drvdata(pdev);
	gpio_free(state->enet_flash_pin);
#ifdef CONFIG_MTD_PARTITIONS
	del_mtd_partitions(state->mtd);
	kfree(state->parts);
#endif
	map_destroy(state->mtd);
	kfree(state);
	return 0;
}

static struct platform_driver bfin_flash_driver = {
	.probe		= bfin_flash_probe,
	.remove		= __devexit_p(bfin_flash_remove),
	.driver		= {
		.name	= DRIVER_NAME,
	},
};

static int __init bfin_flash_init(void)
{
	return platform_driver_register(&bfin_flash_driver);
}
module_init(bfin_flash_init);

static void __exit bfin_flash_exit(void)
{
	platform_driver_unregister(&bfin_flash_driver);
}
module_exit(bfin_flash_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("MTD map driver for Blackfins with flash/ethernet on same async bank");
Commit	Line	Data
2e3c22f5 MF	1	/*
	2	* drivers/mtd/maps/bfin-async-flash.c
	3	*
	4	* Handle the case where flash memory and ethernet mac/phy are
	5	* mapped onto the same async bank. The BF533-STAMP does this
	6	* for example. All board-specific configuration goes in your
	7	* board resources file.
	8	*
2f82af08	9	* Copyright 2000 Nicolas Pitre <nico@fluxnic.net>
2e3c22f5 MF	10	* Copyright 2005-2008 Analog Devices Inc.
	11	*
	12	* Enter bugs at http://blackfin.uclinux.org/
	13	*
	14	* Licensed under the GPL-2 or later.
	15	*/
	16
	17	#include <linux/init.h>
	18	#include <linux/kernel.h>
	19	#include <linux/module.h>
	20	#include <linux/mtd/mtd.h>
	21	#include <linux/mtd/map.h>
	22	#include <linux/mtd/partitions.h>
	23	#include <linux/mtd/physmap.h>
	24	#include <linux/platform_device.h>
	25	#include <linux/types.h>
	26
	27	#include <asm/blackfin.h>
	28	#include <linux/gpio.h>
	29	#include <linux/io.h>
	30	#include <asm/unaligned.h>
	31
	32	#define pr_devinit(fmt, args...) ({ static const __devinitconst char __fmt[] = fmt; printk(__fmt, ## args); })
	33
	34	#define DRIVER_NAME "bfin-async-flash"
	35
	36	struct async_state {
	37	struct mtd_info *mtd;
	38	struct map_info map;
	39	int enet_flash_pin;
	40	uint32_t flash_ambctl0, flash_ambctl1;
	41	uint32_t save_ambctl0, save_ambctl1;
	42	unsigned long irq_flags;
4938c88c MF	43	#ifdef CONFIG_MTD_PARTITIONS
	44	struct mtd_partition *parts;
	45	#endif
2e3c22f5 MF	46	};
	47
	48	static void switch_to_flash(struct async_state *state)
	49	{
	50	local_irq_save(state->irq_flags);
	51
	52	gpio_set_value(state->enet_flash_pin, 0);
	53
	54	state->save_ambctl0 = bfin_read_EBIU_AMBCTL0();
	55	state->save_ambctl1 = bfin_read_EBIU_AMBCTL1();
	56	bfin_write_EBIU_AMBCTL0(state->flash_ambctl0);
	57	bfin_write_EBIU_AMBCTL1(state->flash_ambctl1);
	58	SSYNC();
	59	}
	60
	61	static void switch_back(struct async_state *state)
	62	{
	63	bfin_write_EBIU_AMBCTL0(state->save_ambctl0);
	64	bfin_write_EBIU_AMBCTL1(state->save_ambctl1);
	65	SSYNC();
	66
	67	gpio_set_value(state->enet_flash_pin, 1);
	68
	69	local_irq_restore(state->irq_flags);
	70	}
	71
	72	static map_word bfin_read(struct map_info *map, unsigned long ofs)
	73	{
	74	struct async_state state = (struct async_state )map->map_priv_1;
	75	uint16_t word;
	76	map_word test;
	77
	78	switch_to_flash(state);
	79
	80	word = readw(map->virt + ofs);
	81
	82	switch_back(state);
	83
	84	test.x[0] = word;
	85	return test;
	86	}
	87
	88	static void bfin_copy_from(struct map_info map, void to, unsigned long from, ssize_t len)
	89	{
	90	struct async_state state = (struct async_state )map->map_priv_1;
	91
	92	switch_to_flash(state);
	93
	94	memcpy(to, map->virt + from, len);
	95
	96	switch_back(state);
	97	}
	98
	99	static void bfin_write(struct map_info *map, map_word d1, unsigned long ofs)
	100	{
	101	struct async_state state = (struct async_state )map->map_priv_1;
	102	uint16_t d;
	103
	104	d = d1.x[0];
	105
	106	switch_to_flash(state);
	107
	108	writew(d, map->virt + ofs);
	109	SSYNC();
110
111	switch_back(state);
112	}
113
114	static void bfin_copy_to(struct map_info map, unsigned long to, const void from, ssize_t len)
115	{
116	struct async_state state = (struct async_state )map->map_priv_1;
117
118	switch_to_flash(state);
119
120	memcpy(map->virt + to, from, len);
121	SSYNC();
122
123	switch_back(state);
124	}
125
126	#ifdef CONFIG_MTD_PARTITIONS
127	static const char *part_probe_types[] = { "cmdlinepart", "RedBoot", NULL };
128	#endif
129
130	static int __devinit bfin_flash_probe(struct platform_device *pdev)
131	{
132	int ret;
133	struct physmap_flash_data *pdata = pdev->dev.platform_data;
134	struct resource *memory = platform_get_resource(pdev, IORESOURCE_MEM, 0);
135	struct resource *flash_ambctl = platform_get_resource(pdev, IORESOURCE_MEM, 1);
136	struct async_state *state;
137
138	state = kzalloc(sizeof(*state), GFP_KERNEL);
139	if (!state)
140	return -ENOMEM;
141
142	state->map.name = DRIVER_NAME;
143	state->map.read = bfin_read;
144	state->map.copy_from = bfin_copy_from;
145	state->map.write = bfin_write;
146	state->map.copy_to = bfin_copy_to;
147	state->map.bankwidth = pdata->width;
148	state->map.size = memory->end - memory->start + 1;
149	state->map.virt = (void __iomem *)memory->start;
150	state->map.phys = memory->start;
151	state->map.map_priv_1 = (unsigned long)state;
152	state->enet_flash_pin = platform_get_irq(pdev, 0);
153	state->flash_ambctl0 = flash_ambctl->start;
154	state->flash_ambctl1 = flash_ambctl->end;
155
156	if (gpio_request(state->enet_flash_pin, DRIVER_NAME)) {
157	pr_devinit(KERN_ERR DRIVER_NAME ": Failed to request gpio %d\n", state->enet_flash_pin);
10715b87	158	kfree(state);
2e3c22f5 MF	159	return -EBUSY;
	160	}
	161	gpio_direction_output(state->enet_flash_pin, 1);
	162
	163	pr_devinit(KERN_NOTICE DRIVER_NAME ": probing %d-bit flash bus\n", state->map.bankwidth * 8);
	164	state->mtd = do_map_probe(memory->name, &state->map);
10715b87 MF	165	if (!state->mtd) {
	166	gpio_free(state->enet_flash_pin);
	167	kfree(state);
2e3c22f5	168	return -ENXIO;
10715b87	169	}
2e3c22f5 MF	170
	171	#ifdef CONFIG_MTD_PARTITIONS
	172	ret = parse_mtd_partitions(state->mtd, part_probe_types, &pdata->parts, 0);
	173	if (ret > 0) {
	174	pr_devinit(KERN_NOTICE DRIVER_NAME ": Using commandline partition definition\n");
	175	add_mtd_partitions(state->mtd, pdata->parts, ret);
4938c88c	176	state->parts = pdata->parts;
2e3c22f5 MF	177
	178	} else if (pdata->nr_parts) {
	179	pr_devinit(KERN_NOTICE DRIVER_NAME ": Using board partition definition\n");
	180	add_mtd_partitions(state->mtd, pdata->parts, pdata->nr_parts);
	181
	182	} else
	183	#endif
	184	{
	185	pr_devinit(KERN_NOTICE DRIVER_NAME ": no partition info available, registering whole flash at once\n");
	186	add_mtd_device(state->mtd);
	187	}
	188
	189	platform_set_drvdata(pdev, state);
	190
	191	return 0;
	192	}
	193
	194	static int __devexit bfin_flash_remove(struct platform_device *pdev)
	195	{
	196	struct async_state *state = platform_get_drvdata(pdev);
	197	gpio_free(state->enet_flash_pin);
	198	#ifdef CONFIG_MTD_PARTITIONS
	199	del_mtd_partitions(state->mtd);
4938c88c	200	kfree(state->parts);
2e3c22f5 MF	201	#endif
	202	map_destroy(state->mtd);
	203	kfree(state);
	204	return 0;
	205	}
	206
	207	static struct platform_driver bfin_flash_driver = {
	208	.probe = bfin_flash_probe,
	209	.remove = __devexit_p(bfin_flash_remove),
	210	.driver = {
	211	.name = DRIVER_NAME,
	212	},
	213	};
	214
	215	static int __init bfin_flash_init(void)
	216	{
	217	return platform_driver_register(&bfin_flash_driver);
	218	}
	219	module_init(bfin_flash_init);
	220
	221	static void __exit bfin_flash_exit(void)
	222	{
	223	platform_driver_unregister(&bfin_flash_driver);
	224	}
	225	module_exit(bfin_flash_exit);
	226
	227	MODULE_LICENSE("GPL");
	228	MODULE_DESCRIPTION("MTD map driver for Blackfins with flash/ethernet on same async bank");