[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / mtd / maps / pismo.c

/*
 * PISMO memory driver - http://www.pismoworld.org/
 *
 * For ARM Realview and Versatile platforms
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License.
 */
#include <linux/init.h>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>
#include <linux/mtd/physmap.h>
#include <linux/mtd/plat-ram.h>
#include <linux/mtd/pismo.h>

#define PISMO_NUM_CS	5

struct pismo_cs_block {
	u8	type;
	u8	width;
	__le16	access;
	__le32	size;
	u32	reserved[2];
	char	device[32];
} __packed;

struct pismo_eeprom {
	struct pismo_cs_block cs[PISMO_NUM_CS];
	char	board[15];
	u8	sum;
} __packed;

struct pismo_mem {
	phys_addr_t base;
	u32	size;
	u16	access;
	u8	width;
	u8	type;
};

struct pismo_data {
	struct i2c_client	*client;
	void			(*vpp)(void *, int);
	void			*vpp_data;
	struct platform_device	*dev[PISMO_NUM_CS];
};

static void pismo_set_vpp(struct platform_device *pdev, int on)
{
	struct i2c_client *client = to_i2c_client(pdev->dev.parent);
	struct pismo_data *pismo = i2c_get_clientdata(client);

	pismo->vpp(pismo->vpp_data, on);
}

static unsigned int pismo_width_to_bytes(unsigned int width)
{
	width &= 15;
	if (width > 2)
		return 0;
	return 1 << width;
}

static int pismo_eeprom_read(struct i2c_client *client, void *buf, u8 addr,
			     size_t size)
{
	int ret;
	struct i2c_msg msg[] = {
		{
			.addr = client->addr,
			.len = sizeof(addr),
			.buf = &addr,
		}, {
			.addr = client->addr,
			.flags = I2C_M_RD,
			.len = size,
			.buf = buf,
		},
	};

	ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));

	return ret == ARRAY_SIZE(msg) ? size : -EIO;
}

static int pismo_add_device(struct pismo_data *pismo, int i,
			    struct pismo_mem *region, const char *name,
			    void *pdata, size_t psize)
{
	struct platform_device *dev;
	struct resource res = { };
	phys_addr_t base = region->base;
	int ret;

	if (base == ~0)
		return -ENXIO;

	res.start = base;
	res.end = base + region->size - 1;
	res.flags = IORESOURCE_MEM;

	dev = platform_device_alloc(name, i);
	if (!dev)
		return -ENOMEM;
	dev->dev.parent = &pismo->client->dev;

	do {
		ret = platform_device_add_resources(dev, &res, 1);
		if (ret)
			break;

		ret = platform_device_add_data(dev, pdata, psize);
		if (ret)
			break;

		ret = platform_device_add(dev);
		if (ret)
			break;

		pismo->dev[i] = dev;
		return 0;
	} while (0);

	platform_device_put(dev);
	return ret;
}

static int pismo_add_nor(struct pismo_data *pismo, int i,
			 struct pismo_mem *region)
{
	struct physmap_flash_data data = {
		.width = region->width,
	};

	if (pismo->vpp)
		data.set_vpp = pismo_set_vpp;

	return pismo_add_device(pismo, i, region, "physmap-flash",
		&data, sizeof(data));
}

static int pismo_add_sram(struct pismo_data *pismo, int i,
			  struct pismo_mem *region)
{
	struct platdata_mtd_ram data = {
		.bankwidth = region->width,
	};

	return pismo_add_device(pismo, i, region, "mtd-ram",
		&data, sizeof(data));
}

static void pismo_add_one(struct pismo_data *pismo, int i,
			  const struct pismo_cs_block *cs, phys_addr_t base)
{
	struct device *dev = &pismo->client->dev;
	struct pismo_mem region;

	region.base = base;
	region.type = cs->type;
	region.width = pismo_width_to_bytes(cs->width);
	region.access = le16_to_cpu(cs->access);
	region.size = le32_to_cpu(cs->size);

	if (region.width == 0) {
		dev_err(dev, "cs%u: bad width: %02x, ignoring\n", i, cs->width);
		return;
	}

	/*
	 * FIXME: may need to the platforms memory controller here, but at
	 * the moment we assume that it has already been correctly setup.
	 * The memory controller can also tell us the base address as well.
	 */

	dev_info(dev, "cs%u: %.32s: type %02x access %u00ps size %uK\n",
		i, cs->device, region.type, region.access, region.size / 1024);

	switch (region.type) {
	case 0:
		break;
	case 1:
		/* static DOC */
		break;
	case 2:
		/* static NOR */
		pismo_add_nor(pismo, i, &region);
		break;
	case 3:
		/* static RAM */
		pismo_add_sram(pismo, i, &region);
		break;
	}
}

static int pismo_remove(struct i2c_client *client)
{
	struct pismo_data *pismo = i2c_get_clientdata(client);
	int i;

	for (i = 0; i < ARRAY_SIZE(pismo->dev); i++)
		platform_device_unregister(pismo->dev[i]);

	kfree(pismo);

	return 0;
}

static int pismo_probe(struct i2c_client *client,
		       const struct i2c_device_id *id)
{
	struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
	struct pismo_pdata *pdata = client->dev.platform_data;
	struct pismo_eeprom eeprom;
	struct pismo_data *pismo;
	int ret, i;

	if (!i2c_check_functionality(adapter, I2C_FUNC_I2C)) {
		dev_err(&client->dev, "functionality mismatch\n");
		return -EIO;
	}

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

	pismo->client = client;
	if (pdata) {
		pismo->vpp = pdata->set_vpp;
		pismo->vpp_data = pdata->vpp_data;
	}
	i2c_set_clientdata(client, pismo);

	ret = pismo_eeprom_read(client, &eeprom, 0, sizeof(eeprom));
	if (ret < 0) {
		dev_err(&client->dev, "error reading EEPROM: %d\n", ret);
		goto exit_free;
	}

	dev_info(&client->dev, "%.15s board found\n", eeprom.board);

	for (i = 0; i < ARRAY_SIZE(eeprom.cs); i++)
		if (eeprom.cs[i].type != 0xff)
			pismo_add_one(pismo, i, &eeprom.cs[i],
				      pdata->cs_addrs[i]);

	return 0;

 exit_free:
	kfree(pismo);
	return ret;
}

static const struct i2c_device_id pismo_id[] = {
	{ "pismo" },
	{ },
};
MODULE_DEVICE_TABLE(i2c, pismo_id);

static struct i2c_driver pismo_driver = {
	.driver	= {
		.name	= "pismo",
		.owner	= THIS_MODULE,
	},
	.probe		= pismo_probe,
	.remove		= pismo_remove,
	.id_table	= pismo_id,
};

static int __init pismo_init(void)
{
	BUILD_BUG_ON(sizeof(struct pismo_cs_block) != 48);
	BUILD_BUG_ON(sizeof(struct pismo_eeprom) != 256);

	return i2c_add_driver(&pismo_driver);
}
module_init(pismo_init);

static void __exit pismo_exit(void)
{
	i2c_del_driver(&pismo_driver);
}
module_exit(pismo_exit);

MODULE_AUTHOR("Russell King <linux@arm.linux.org.uk>");
MODULE_DESCRIPTION("PISMO memory driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
f6a8c609 RKAL	1	/*
	2	* PISMO memory driver - http://www.pismoworld.org/
	3	*
	4	* For ARM Realview and Versatile platforms
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License.
	9	*/
	10	#include <linux/init.h>
	11	#include <linux/module.h>
	12	#include <linux/i2c.h>
5a0e3ad6	13	#include <linux/slab.h>
f6a8c609 RKAL	14	#include <linux/platform_device.h>
	15	#include <linux/spinlock.h>
	16	#include <linux/mutex.h>
	17	#include <linux/mtd/physmap.h>
	18	#include <linux/mtd/plat-ram.h>
	19	#include <linux/mtd/pismo.h>
	20
	21	#define PISMO_NUM_CS 5
	22
	23	struct pismo_cs_block {
	24	u8 type;
	25	u8 width;
	26	__le16 access;
	27	__le32 size;
	28	u32 reserved[2];
	29	char device[32];
	30	} __packed;
	31
	32	struct pismo_eeprom {
	33	struct pismo_cs_block cs[PISMO_NUM_CS];
	34	char board[15];
	35	u8 sum;
	36	} __packed;
	37
	38	struct pismo_mem {
	39	phys_addr_t base;
	40	u32 size;
	41	u16 access;
	42	u8 width;
	43	u8 type;
	44	};
	45
	46	struct pismo_data {
	47	struct i2c_client *client;
	48	void (vpp)(void , int);
	49	void *vpp_data;
	50	struct platform_device *dev[PISMO_NUM_CS];
	51	};
	52
667f390b	53	static void pismo_set_vpp(struct platform_device *pdev, int on)
f6a8c609	54	{
667f390b MZ	55	struct i2c_client *client = to_i2c_client(pdev->dev.parent);
667f390b MZ	56	struct pismo_data *pismo = i2c_get_clientdata(client);
f6a8c609 RKAL	57
	58	pismo->vpp(pismo->vpp_data, on);
	59	}
f6a8c609	60
06f25510	61	static unsigned int pismo_width_to_bytes(unsigned int width)
f6a8c609 RKAL	62	{
	63	width &= 15;
	64	if (width > 2)
	65	return 0;
	66	return 1 << width;
	67	}
	68
d8929942 GKH	69	static int pismo_eeprom_read(struct i2c_client client, void buf, u8 addr,
d8929942 GKH	70	size_t size)
f6a8c609 RKAL	71	{
	72	int ret;
	73	struct i2c_msg msg[] = {
	74	{
	75	.addr = client->addr,
	76	.len = sizeof(addr),
	77	.buf = &addr,
	78	}, {
	79	.addr = client->addr,
	80	.flags = I2C_M_RD,
	81	.len = size,
	82	.buf = buf,
	83	},
	84	};
	85
	86	ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
	87
	88	return ret == ARRAY_SIZE(msg) ? size : -EIO;
	89	}
	90
06f25510	91	static int pismo_add_device(struct pismo_data *pismo, int i,
d8929942 GKH	92	struct pismo_mem region, const char name,
d8929942 GKH	93	void *pdata, size_t psize)
f6a8c609 RKAL	94	{
	95	struct platform_device *dev;
	96	struct resource res = { };
1d40ddd1	97	phys_addr_t base = region->base;
f6a8c609 RKAL	98	int ret;
	99
	100	if (base == ~0)
	101	return -ENXIO;
	102
	103	res.start = base;
	104	res.end = base + region->size - 1;
	105	res.flags = IORESOURCE_MEM;
	106
	107	dev = platform_device_alloc(name, i);
	108	if (!dev)
	109	return -ENOMEM;
	110	dev->dev.parent = &pismo->client->dev;
	111
	112	do {
	113	ret = platform_device_add_resources(dev, &res, 1);
	114	if (ret)
	115	break;
	116
	117	ret = platform_device_add_data(dev, pdata, psize);
	118	if (ret)
	119	break;
	120
	121	ret = platform_device_add(dev);
	122	if (ret)
	123	break;
	124
	125	pismo->dev[i] = dev;
	126	return 0;
	127	} while (0);
	128
	129	platform_device_put(dev);
	130	return ret;
	131	}
	132
06f25510	133	static int pismo_add_nor(struct pismo_data *pismo, int i,
d8929942	134	struct pismo_mem *region)
f6a8c609 RKAL	135	{
	136	struct physmap_flash_data data = {
	137	.width = region->width,
	138	};
	139
	140	if (pismo->vpp)
	141	data.set_vpp = pismo_set_vpp;
	142
	143	return pismo_add_device(pismo, i, region, "physmap-flash",
	144	&data, sizeof(data));
	145	}
	146
06f25510	147	static int pismo_add_sram(struct pismo_data *pismo, int i,
d8929942	148	struct pismo_mem *region)
f6a8c609 RKAL	149	{
	150	struct platdata_mtd_ram data = {
	151	.bankwidth = region->width,
	152	};
	153
	154	return pismo_add_device(pismo, i, region, "mtd-ram",
	155	&data, sizeof(data));
	156	}
	157
06f25510	158	static void pismo_add_one(struct pismo_data *pismo, int i,
d8929942	159	const struct pismo_cs_block *cs, phys_addr_t base)
f6a8c609 RKAL	160	{
	161	struct device *dev = &pismo->client->dev;
	162	struct pismo_mem region;
	163
	164	region.base = base;
	165	region.type = cs->type;
	166	region.width = pismo_width_to_bytes(cs->width);
	167	region.access = le16_to_cpu(cs->access);
	168	region.size = le32_to_cpu(cs->size);
	169
	170	if (region.width == 0) {
	171	dev_err(dev, "cs%u: bad width: %02x, ignoring\n", i, cs->width);
	172	return;
	173	}
	174
	175	/*
	176	* FIXME: may need to the platforms memory controller here, but at
	177	* the moment we assume that it has already been correctly setup.
	178	* The memory controller can also tell us the base address as well.
	179	*/
	180
	181	dev_info(dev, "cs%u: %.32s: type %02x access %u00ps size %uK\n",
	182	i, cs->device, region.type, region.access, region.size / 1024);
	183
	184	switch (region.type) {
	185	case 0:
	186	break;
	187	case 1:
	188	/* static DOC */
	189	break;
	190	case 2:
	191	/* static NOR */
	192	pismo_add_nor(pismo, i, &region);
	193	break;
	194	case 3:
	195	/* static RAM */
	196	pismo_add_sram(pismo, i, &region);
	197	break;
	198	}
	199	}
	200
810b7e06	201	static int pismo_remove(struct i2c_client *client)
f6a8c609 RKAL	202	{
	203	struct pismo_data *pismo = i2c_get_clientdata(client);
	204	int i;
	205
	206	for (i = 0; i < ARRAY_SIZE(pismo->dev); i++)
	207	platform_device_unregister(pismo->dev[i]);
	208
f6a8c609 RKAL	209	kfree(pismo);
	210
	211	return 0;
	212	}
	213
06f25510	214	static int pismo_probe(struct i2c_client *client,
d8929942	215	const struct i2c_device_id *id)
f6a8c609 RKAL	216	{
	217	struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
	218	struct pismo_pdata *pdata = client->dev.platform_data;
	219	struct pismo_eeprom eeprom;
	220	struct pismo_data *pismo;
	221	int ret, i;
	222
	223	if (!i2c_check_functionality(adapter, I2C_FUNC_I2C)) {
	224	dev_err(&client->dev, "functionality mismatch\n");
	225	return -EIO;
	226	}
	227
	228	pismo = kzalloc(sizeof(*pismo), GFP_KERNEL);
	229	if (!pismo)
	230	return -ENOMEM;
	231
f6a8c609 RKAL	232	pismo->client = client;
	233	if (pdata) {
	234	pismo->vpp = pdata->set_vpp;
	235	pismo->vpp_data = pdata->vpp_data;
	236	}
	237	i2c_set_clientdata(client, pismo);
	238
	239	ret = pismo_eeprom_read(client, &eeprom, 0, sizeof(eeprom));
	240	if (ret < 0) {
	241	dev_err(&client->dev, "error reading EEPROM: %d\n", ret);
395b2288	242	goto exit_free;
f6a8c609 RKAL	243	}
	244
	245	dev_info(&client->dev, "%.15s board found\n", eeprom.board);
	246
	247	for (i = 0; i < ARRAY_SIZE(eeprom.cs); i++)
	248	if (eeprom.cs[i].type != 0xff)
	249	pismo_add_one(pismo, i, &eeprom.cs[i],
	250	pdata->cs_addrs[i]);
	251
	252	return 0;
395b2288 WS	253
395b2288 WS	254	exit_free:
395b2288 WS	255	kfree(pismo);
395b2288 WS	256	return ret;
f6a8c609 RKAL	257	}
	258
	259	static const struct i2c_device_id pismo_id[] = {
	260	{ "pismo" },
	261	{ },
	262	};
	263	MODULE_DEVICE_TABLE(i2c, pismo_id);
	264
	265	static struct i2c_driver pismo_driver = {
	266	.driver = {
	267	.name = "pismo",
	268	.owner = THIS_MODULE,
	269	},
	270	.probe = pismo_probe,
5153b88c	271	.remove = pismo_remove,
f6a8c609 RKAL	272	.id_table = pismo_id,
	273	};
	274
	275	static int __init pismo_init(void)
	276	{
	277	BUILD_BUG_ON(sizeof(struct pismo_cs_block) != 48);
	278	BUILD_BUG_ON(sizeof(struct pismo_eeprom) != 256);
	279
	280	return i2c_add_driver(&pismo_driver);
	281	}
	282	module_init(pismo_init);
	283
	284	static void __exit pismo_exit(void)
	285	{
	286	i2c_del_driver(&pismo_driver);
	287	}
	288	module_exit(pismo_exit);
	289
	290	MODULE_AUTHOR("Russell King <linux@arm.linux.org.uk>");
	291	MODULE_DESCRIPTION("PISMO memory driver");
	292	MODULE_LICENSE("GPL");