[mirror_ubuntu-artful-kernel.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/slab.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 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;
};

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_flash_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_flash_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_flash_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_flash_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);
}

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

static int bfin_flash_probe(struct platform_device *pdev)
{
	int ret;
	struct physmap_flash_data *pdata = dev_get_platdata(&pdev->dev);
	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_flash_read;
	state->map.copy_from  = bfin_flash_copy_from;
	state->map.write      = bfin_flash_write;
	state->map.copy_to    = bfin_flash_copy_to;
	state->map.bankwidth  = pdata->width;
	state->map.size       = resource_size(memory);
	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;
	}

	mtd_device_parse_register(state->mtd, part_probe_types, NULL,
				  pdata->parts, pdata->nr_parts);

	platform_set_drvdata(pdev, state);

	return 0;
}

static int bfin_flash_remove(struct platform_device *pdev)
{
	struct async_state *state = platform_get_drvdata(pdev);
	gpio_free(state->enet_flash_pin);
	mtd_device_unregister(state->mtd);
	map_destroy(state->mtd);
	kfree(state);
	return 0;
}

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

module_platform_driver(bfin_flash_driver);

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>
5a0e3ad6	25	#include <linux/slab.h>
2e3c22f5 MF	26	#include <linux/types.h>
	27
	28	#include <asm/blackfin.h>
	29	#include <linux/gpio.h>
	30	#include <linux/io.h>
	31	#include <asm/unaligned.h>
	32
7bf350b7 AB	33	#define pr_devinit(fmt, args...) \
7bf350b7 AB	34	({ static const char __fmt[] = fmt; printk(__fmt, ## args); })
2e3c22f5 MF	35
	36	#define DRIVER_NAME "bfin-async-flash"
	37
	38	struct async_state {
	39	struct mtd_info *mtd;
	40	struct map_info map;
	41	int enet_flash_pin;
	42	uint32_t flash_ambctl0, flash_ambctl1;
	43	uint32_t save_ambctl0, save_ambctl1;
	44	unsigned long irq_flags;
	45	};
	46
	47	static void switch_to_flash(struct async_state *state)
	48	{
	49	local_irq_save(state->irq_flags);
	50
	51	gpio_set_value(state->enet_flash_pin, 0);
	52
	53	state->save_ambctl0 = bfin_read_EBIU_AMBCTL0();
	54	state->save_ambctl1 = bfin_read_EBIU_AMBCTL1();
	55	bfin_write_EBIU_AMBCTL0(state->flash_ambctl0);
	56	bfin_write_EBIU_AMBCTL1(state->flash_ambctl1);
	57	SSYNC();
	58	}
	59
	60	static void switch_back(struct async_state *state)
	61	{
	62	bfin_write_EBIU_AMBCTL0(state->save_ambctl0);
	63	bfin_write_EBIU_AMBCTL1(state->save_ambctl1);
	64	SSYNC();
	65
	66	gpio_set_value(state->enet_flash_pin, 1);
	67
	68	local_irq_restore(state->irq_flags);
	69	}
	70
4335c100	71	static map_word bfin_flash_read(struct map_info *map, unsigned long ofs)
2e3c22f5 MF	72	{
	73	struct async_state state = (struct async_state )map->map_priv_1;
	74	uint16_t word;
	75	map_word test;
	76
	77	switch_to_flash(state);
	78
	79	word = readw(map->virt + ofs);
	80
	81	switch_back(state);
	82
	83	test.x[0] = word;
	84	return test;
	85	}
	86
4335c100	87	static void bfin_flash_copy_from(struct map_info map, void to, unsigned long from, ssize_t len)
2e3c22f5 MF	88	{
	89	struct async_state state = (struct async_state )map->map_priv_1;
	90
	91	switch_to_flash(state);
	92
	93	memcpy(to, map->virt + from, len);
	94
	95	switch_back(state);
	96	}
	97
4335c100	98	static void bfin_flash_write(struct map_info *map, map_word d1, unsigned long ofs)
2e3c22f5 MF	99	{
	100	struct async_state state = (struct async_state )map->map_priv_1;
	101	uint16_t d;
	102
	103	d = d1.x[0];
	104
	105	switch_to_flash(state);
	106
	107	writew(d, map->virt + ofs);
	108	SSYNC();
	109
	110	switch_back(state);
	111	}
	112
4335c100	113	static void bfin_flash_copy_to(struct map_info map, unsigned long to, const void from, ssize_t len)
2e3c22f5 MF	114	{
	115	struct async_state state = (struct async_state )map->map_priv_1;
	116
	117	switch_to_flash(state);
	118
	119	memcpy(map->virt + to, from, len);
	120	SSYNC();
	121
	122	switch_back(state);
	123	}
	124
0984c891 AB	125	static const char * const part_probe_types[] = {
0984c891 AB	126	"cmdlinepart", "RedBoot", NULL };
2e3c22f5	127
06f25510	128	static int bfin_flash_probe(struct platform_device *pdev)
2e3c22f5 MF	129	{
2e3c22f5 MF	130	int ret;
d20d5a57	131	struct physmap_flash_data *pdata = dev_get_platdata(&pdev->dev);
2e3c22f5 MF	132	struct resource *memory = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	133	struct resource *flash_ambctl = platform_get_resource(pdev, IORESOURCE_MEM, 1);
	134	struct async_state *state;
	135
	136	state = kzalloc(sizeof(*state), GFP_KERNEL);
	137	if (!state)
	138	return -ENOMEM;
	139
	140	state->map.name = DRIVER_NAME;
4335c100 MF	141	state->map.read = bfin_flash_read;
	142	state->map.copy_from = bfin_flash_copy_from;
	143	state->map.write = bfin_flash_write;
	144	state->map.copy_to = bfin_flash_copy_to;
2e3c22f5	145	state->map.bankwidth = pdata->width;
28f65c11	146	state->map.size = resource_size(memory);
2e3c22f5 MF	147	state->map.virt = (void __iomem *)memory->start;
	148	state->map.phys = memory->start;
	149	state->map.map_priv_1 = (unsigned long)state;
	150	state->enet_flash_pin = platform_get_irq(pdev, 0);
	151	state->flash_ambctl0 = flash_ambctl->start;
	152	state->flash_ambctl1 = flash_ambctl->end;
	153
	154	if (gpio_request(state->enet_flash_pin, DRIVER_NAME)) {
	155	pr_devinit(KERN_ERR DRIVER_NAME ": Failed to request gpio %d\n", state->enet_flash_pin);
10715b87	156	kfree(state);
2e3c22f5 MF	157	return -EBUSY;
	158	}
	159	gpio_direction_output(state->enet_flash_pin, 1);
	160
	161	pr_devinit(KERN_NOTICE DRIVER_NAME ": probing %d-bit flash bus\n", state->map.bankwidth * 8);
	162	state->mtd = do_map_probe(memory->name, &state->map);
10715b87 MF	163	if (!state->mtd) {
	164	gpio_free(state->enet_flash_pin);
	165	kfree(state);
2e3c22f5	166	return -ENXIO;
10715b87	167	}
2e3c22f5	168
42d7fbe2 AB	169	mtd_device_parse_register(state->mtd, part_probe_types, NULL,
42d7fbe2 AB	170	pdata->parts, pdata->nr_parts);
2e3c22f5 MF	171
	172	platform_set_drvdata(pdev, state);
	173
	174	return 0;
	175	}
	176
810b7e06	177	static int bfin_flash_remove(struct platform_device *pdev)
2e3c22f5 MF	178	{
	179	struct async_state *state = platform_get_drvdata(pdev);
	180	gpio_free(state->enet_flash_pin);
fee88c58	181	mtd_device_unregister(state->mtd);
2e3c22f5 MF	182	map_destroy(state->mtd);
	183	kfree(state);
	184	return 0;
	185	}
	186
	187	static struct platform_driver bfin_flash_driver = {
	188	.probe = bfin_flash_probe,
5153b88c	189	.remove = bfin_flash_remove,
2e3c22f5 MF	190	.driver = {
	191	.name = DRIVER_NAME,
	192	},
	193	};
	194
f99640de	195	module_platform_driver(bfin_flash_driver);
2e3c22f5 MF	196
	197	MODULE_LICENSE("GPL");
	198	MODULE_DESCRIPTION("MTD map driver for Blackfins with flash/ethernet on same async bank");