mtd: Really add ARM pismo support

	  To build this as a module select M here, the module will be called

	  To build this as a module select M here, the module will be called

	  vmu-flash.

	  vmu-flash.

config MTD_PISMO

	tristate "MTD discovery driver for PISMO modules"

	depends on I2C

	depends on ARCH_VERSATILE

	help

	  This driver allows for discovery of PISMO modules - see

	  <http://www.pismoworld.org/>.  These are small modules containing

	  up to five memory devices (eg, SRAM, flash, DOC) described by an

	  I2C EEPROM.

	  This driver does not create any MTD maps itself; instead it

	  creates MTD physmap and MTD SRAM platform devices.  If you

	  enable this option, you should consider enabling MTD_PHYSMAP

	  and/or MTD_PLATRAM according to the devices on your module.

	  When built as a module, it will be called pismo.ko

endmenu

endmenu

/*

 * 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/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];

};

/* FIXME: set_vpp could do with a better calling convention */

static struct pismo_data *vpp_pismo;

static DEFINE_MUTEX(pismo_mutex);

static int pismo_setvpp_probe_fix(struct pismo_data *pismo)

{

	mutex_lock(&pismo_mutex);

	if (vpp_pismo) {

		mutex_unlock(&pismo_mutex);

		kfree(pismo);

		return -EBUSY;

	}

	vpp_pismo = pismo;

	mutex_unlock(&pismo_mutex);

	return 0;

}

static void pismo_setvpp_remove_fix(struct pismo_data *pismo)

{

	mutex_lock(&pismo_mutex);

	if (vpp_pismo == pismo)

		vpp_pismo = NULL;

	mutex_unlock(&pismo_mutex);

}

static void pismo_set_vpp(struct map_info *map, int on)

{

	struct pismo_data *pismo = vpp_pismo;

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

}

/* end of hack */

static unsigned int __devinit pismo_width_to_bytes(unsigned int width)

{

	width &= 15;

	if (width > 2)

		return 0;

	return 1 << width;

}

static int __devinit 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 __devinit 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 __devinit 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 __devinit 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 __devinit 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 __devexit 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]);

	/* FIXME: set_vpp needs saner arguments */

	pismo_setvpp_remove_fix(pismo);

	kfree(pismo);

	return 0;

}

static int __devinit 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;

	/* FIXME: set_vpp needs saner arguments */

	ret = pismo_setvpp_probe_fix(pismo);

	if (ret)

		return ret;

	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);

		return ret;

	}

	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;

}

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		= __devexit_p(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");

/*

 * PISMO memory driver - http://www.pismoworld.org/

 *

 * 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.

 */

#ifndef __LINUX_MTD_PISMO_H

#define __LINUX_MTD_PISMO_H

struct pismo_pdata {

	void			(*set_vpp)(void *, int);

	void			*vpp_data;

	phys_addr_t		cs_addrs[5];

};

#endif