[linux-2.6-block.git] / drivers / ipack / ipack.c

/*
 * Industry-pack bus support functions.
 *
 * Copyright (C) 2011-2012 CERN (www.cern.ch)
 * Author: Samuel Iglesias Gonsalvez <siglesias@igalia.com>
 *
 * 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; version 2 of the License.
 */

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/idr.h>
#include <linux/io.h>
#include <linux/ipack.h>

#define to_ipack_dev(device) container_of(device, struct ipack_device, dev)
#define to_ipack_driver(drv) container_of(drv, struct ipack_driver, driver)

static DEFINE_IDA(ipack_ida);

static void ipack_device_release(struct device *dev)
{
	struct ipack_device *device = to_ipack_dev(dev);
	kfree(device->id);
	device->release(device);
}

static inline const struct ipack_device_id *
ipack_match_one_device(const struct ipack_device_id *id,
		       const struct ipack_device *device)
{
	if ((id->format == IPACK_ANY_FORMAT ||
				id->format == device->id_format) &&
	    (id->vendor == IPACK_ANY_ID || id->vendor == device->id_vendor) &&
	    (id->device == IPACK_ANY_ID || id->device == device->id_device))
		return id;
	return NULL;
}

static const struct ipack_device_id *
ipack_match_id(const struct ipack_device_id *ids, struct ipack_device *idev)
{
	if (ids) {
		while (ids->vendor || ids->device) {
			if (ipack_match_one_device(ids, idev))
				return ids;
			ids++;
		}
	}
	return NULL;
}

static int ipack_bus_match(struct device *dev, struct device_driver *drv)
{
	struct ipack_device *idev = to_ipack_dev(dev);
	struct ipack_driver *idrv = to_ipack_driver(drv);
	const struct ipack_device_id *found_id;

	found_id = ipack_match_id(idrv->id_table, idev);
	return found_id ? 1 : 0;
}

static int ipack_bus_probe(struct device *device)
{
	struct ipack_device *dev = to_ipack_dev(device);
	struct ipack_driver *drv = to_ipack_driver(device->driver);

	if (!drv->ops->probe)
		return -EINVAL;

	return drv->ops->probe(dev);
}

static int ipack_bus_remove(struct device *device)
{
	struct ipack_device *dev = to_ipack_dev(device);
	struct ipack_driver *drv = to_ipack_driver(device->driver);

	if (!drv->ops->remove)
		return -EINVAL;

	drv->ops->remove(dev);
	return 0;
}

static int ipack_uevent(struct device *dev, struct kobj_uevent_env *env)
{
	struct ipack_device *idev;

	if (!dev)
		return -ENODEV;

	idev = to_ipack_dev(dev);

	if (add_uevent_var(env,
			   "MODALIAS=ipack:f%02Xv%08Xd%08X", idev->id_format,
			   idev->id_vendor, idev->id_device))
		return -ENOMEM;

	return 0;
}

#define ipack_device_attr(field, format_string)				\
static ssize_t								\
field##_show(struct device *dev, struct device_attribute *attr,		\
		char *buf)						\
{									\
	struct ipack_device *idev = to_ipack_dev(dev);			\
	return sprintf(buf, format_string, idev->field);		\
}

static ssize_t id_show(struct device *dev,
		       struct device_attribute *attr, char *buf)
{
	unsigned int i, c, l, s;
	struct ipack_device *idev = to_ipack_dev(dev);


	switch (idev->id_format) {
	case IPACK_ID_VERSION_1:
		l = 0x7; s = 1; break;
	case IPACK_ID_VERSION_2:
		l = 0xf; s = 2; break;
	default:
		return -EIO;
	}
	c = 0;
	for (i = 0; i < idev->id_avail; i++) {
		if (i > 0) {
			if ((i & l) == 0)
				buf[c++] = '\n';
			else if ((i & s) == 0)
				buf[c++] = ' ';
		}
		sprintf(&buf[c], "%02x", idev->id[i]);
		c += 2;
	}
	buf[c++] = '\n';
	return c;
}

static ssize_t
id_vendor_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct ipack_device *idev = to_ipack_dev(dev);
	switch (idev->id_format) {
	case IPACK_ID_VERSION_1:
		return sprintf(buf, "0x%02x\n", idev->id_vendor);
	case IPACK_ID_VERSION_2:
		return sprintf(buf, "0x%06x\n", idev->id_vendor);
	default:
		return -EIO;
	}
}

static ssize_t
id_device_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct ipack_device *idev = to_ipack_dev(dev);
	switch (idev->id_format) {
	case IPACK_ID_VERSION_1:
		return sprintf(buf, "0x%02x\n", idev->id_device);
	case IPACK_ID_VERSION_2:
		return sprintf(buf, "0x%04x\n", idev->id_device);
	default:
		return -EIO;
	}
}

static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
			     char *buf)
{
	struct ipack_device *idev = to_ipack_dev(dev);

	return sprintf(buf, "ipac:f%02Xv%08Xd%08X", idev->id_format,
		       idev->id_vendor, idev->id_device);
}

ipack_device_attr(id_format, "0x%hhu\n");

static DEVICE_ATTR_RO(id);
static DEVICE_ATTR_RO(id_device);
static DEVICE_ATTR_RO(id_format);
static DEVICE_ATTR_RO(id_vendor);
static DEVICE_ATTR_RO(modalias);

static struct attribute *ipack_attrs[] = {
	&dev_attr_id.attr,
	&dev_attr_id_device.attr,
	&dev_attr_id_format.attr,
	&dev_attr_id_vendor.attr,
	&dev_attr_modalias.attr,
	NULL,
};
ATTRIBUTE_GROUPS(ipack);

static struct bus_type ipack_bus_type = {
	.name      = "ipack",
	.probe     = ipack_bus_probe,
	.match     = ipack_bus_match,
	.remove    = ipack_bus_remove,
	.dev_groups = ipack_groups,
	.uevent	   = ipack_uevent,
};

struct ipack_bus_device *ipack_bus_register(struct device *parent, int slots,
					    const struct ipack_bus_ops *ops,
					    struct module *owner)
{
	int bus_nr;
	struct ipack_bus_device *bus;

	bus = kzalloc(sizeof(struct ipack_bus_device), GFP_KERNEL);
	if (!bus)
		return NULL;

	bus_nr = ida_simple_get(&ipack_ida, 0, 0, GFP_KERNEL);
	if (bus_nr < 0) {
		kfree(bus);
		return NULL;
	}

	bus->bus_nr = bus_nr;
	bus->parent = parent;
	bus->slots = slots;
	bus->ops = ops;
	bus->owner = owner;
	return bus;
}
EXPORT_SYMBOL_GPL(ipack_bus_register);

static int ipack_unregister_bus_member(struct device *dev, void *data)
{
	struct ipack_device *idev = to_ipack_dev(dev);
	struct ipack_bus_device *bus = data;

	if (idev->bus == bus)
		ipack_device_del(idev);

	return 1;
}

int ipack_bus_unregister(struct ipack_bus_device *bus)
{
	bus_for_each_dev(&ipack_bus_type, NULL, bus,
		ipack_unregister_bus_member);
	ida_simple_remove(&ipack_ida, bus->bus_nr);
	kfree(bus);
	return 0;
}
EXPORT_SYMBOL_GPL(ipack_bus_unregister);

int ipack_driver_register(struct ipack_driver *edrv, struct module *owner,
			  const char *name)
{
	edrv->driver.owner = owner;
	edrv->driver.name = name;
	edrv->driver.bus = &ipack_bus_type;
	return driver_register(&edrv->driver);
}
EXPORT_SYMBOL_GPL(ipack_driver_register);

void ipack_driver_unregister(struct ipack_driver *edrv)
{
	driver_unregister(&edrv->driver);
}
EXPORT_SYMBOL_GPL(ipack_driver_unregister);

static u16 ipack_crc_byte(u16 crc, u8 c)
{
	int i;

	crc ^= c << 8;
	for (i = 0; i < 8; i++)
		crc = (crc << 1) ^ ((crc & 0x8000) ? 0x1021 : 0);
	return crc;
}

/*
 * The algorithm in lib/crc-ccitt.c does not seem to apply since it uses the
 * opposite bit ordering.
 */
static u8 ipack_calc_crc1(struct ipack_device *dev)
{
	u8 c;
	u16 crc;
	unsigned int i;

	crc = 0xffff;
	for (i = 0; i < dev->id_avail; i++) {
		c = (i != 11) ? dev->id[i] : 0;
		crc = ipack_crc_byte(crc, c);
	}
	crc = ~crc;
	return crc & 0xff;
}

static u16 ipack_calc_crc2(struct ipack_device *dev)
{
	u8 c;
	u16 crc;
	unsigned int i;

	crc = 0xffff;
	for (i = 0; i < dev->id_avail; i++) {
		c = ((i != 0x18) && (i != 0x19)) ? dev->id[i] : 0;
		crc = ipack_crc_byte(crc, c);
	}
	crc = ~crc;
	return crc;
}

static void ipack_parse_id1(struct ipack_device *dev)
{
	u8 *id = dev->id;
	u8 crc;

	dev->id_vendor = id[4];
	dev->id_device = id[5];
	dev->speed_8mhz = 1;
	dev->speed_32mhz = (id[7] == 'H');
	crc = ipack_calc_crc1(dev);
	dev->id_crc_correct = (crc == id[11]);
	if (!dev->id_crc_correct) {
		dev_warn(&dev->dev, "ID CRC invalid found 0x%x, expected 0x%x.\n",
				id[11], crc);
	}
}

static void ipack_parse_id2(struct ipack_device *dev)
{
	__be16 *id = (__be16 *) dev->id;
	u16 flags, crc;

	dev->id_vendor = ((be16_to_cpu(id[3]) & 0xff) << 16)
			 + be16_to_cpu(id[4]);
	dev->id_device = be16_to_cpu(id[5]);
	flags = be16_to_cpu(id[10]);
	dev->speed_8mhz = !!(flags & 2);
	dev->speed_32mhz = !!(flags & 4);
	crc = ipack_calc_crc2(dev);
	dev->id_crc_correct = (crc == be16_to_cpu(id[12]));
	if (!dev->id_crc_correct) {
		dev_warn(&dev->dev, "ID CRC invalid found 0x%x, expected 0x%x.\n",
				id[11], crc);
	}
}

static int ipack_device_read_id(struct ipack_device *dev)
{
	u8 __iomem *idmem;
	int i;
	int ret = 0;

	idmem = ioremap(dev->region[IPACK_ID_SPACE].start,
			dev->region[IPACK_ID_SPACE].size);
	if (!idmem) {
		dev_err(&dev->dev, "error mapping memory\n");
		return -ENOMEM;
	}

	/* Determine ID PROM Data Format.  If we find the ids "IPAC" or "IPAH"
	 * we are dealing with a IndustryPack  format 1 device.  If we detect
	 * "VITA4 " (16 bit big endian formatted) we are dealing with a
	 * IndustryPack format 2 device */
	if ((ioread8(idmem + 1) == 'I') &&
			(ioread8(idmem + 3) == 'P') &&
			(ioread8(idmem + 5) == 'A') &&
			((ioread8(idmem + 7) == 'C') ||
			 (ioread8(idmem + 7) == 'H'))) {
		dev->id_format = IPACK_ID_VERSION_1;
		dev->id_avail = ioread8(idmem + 0x15);
		if ((dev->id_avail < 0x0c) || (dev->id_avail > 0x40)) {
			dev_warn(&dev->dev, "invalid id size");
			dev->id_avail = 0x0c;
		}
	} else if ((ioread8(idmem + 0) == 'I') &&
			(ioread8(idmem + 1) == 'V') &&
			(ioread8(idmem + 2) == 'A') &&
			(ioread8(idmem + 3) == 'T') &&
			(ioread8(idmem + 4) == ' ') &&
			(ioread8(idmem + 5) == '4')) {
		dev->id_format = IPACK_ID_VERSION_2;
		dev->id_avail = ioread16be(idmem + 0x16);
		if ((dev->id_avail < 0x1a) || (dev->id_avail > 0x40)) {
			dev_warn(&dev->dev, "invalid id size");
			dev->id_avail = 0x1a;
		}
	} else {
		dev->id_format = IPACK_ID_VERSION_INVALID;
		dev->id_avail = 0;
	}

	if (!dev->id_avail) {
		ret = -ENODEV;
		goto out;
	}

	/* Obtain the amount of memory required to store a copy of the complete
	 * ID ROM contents */
	dev->id = kmalloc(dev->id_avail, GFP_KERNEL);
	if (!dev->id) {
		dev_err(&dev->dev, "dev->id alloc failed.\n");
		ret = -ENOMEM;
		goto out;
	}
	for (i = 0; i < dev->id_avail; i++) {
		if (dev->id_format == IPACK_ID_VERSION_1)
			dev->id[i] = ioread8(idmem + (i << 1) + 1);
		else
			dev->id[i] = ioread8(idmem + i);
	}

	/* now we can finally work with the copy */
	switch (dev->id_format) {
	case IPACK_ID_VERSION_1:
		ipack_parse_id1(dev);
		break;
	case IPACK_ID_VERSION_2:
		ipack_parse_id2(dev);
		break;
	}

out:
	iounmap(idmem);

	return ret;
}

int ipack_device_init(struct ipack_device *dev)
{
	int ret;

	dev->dev.bus = &ipack_bus_type;
	dev->dev.release = ipack_device_release;
	dev->dev.parent = dev->bus->parent;
	dev_set_name(&dev->dev,
		     "ipack-dev.%u.%u", dev->bus->bus_nr, dev->slot);
	device_initialize(&dev->dev);

	if (dev->bus->ops->set_clockrate(dev, 8))
		dev_warn(&dev->dev, "failed to switch to 8 MHz operation for reading of device ID.\n");
	if (dev->bus->ops->reset_timeout(dev))
		dev_warn(&dev->dev, "failed to reset potential timeout.");

	ret = ipack_device_read_id(dev);
	if (ret < 0) {
		dev_err(&dev->dev, "error reading device id section.\n");
		return ret;
	}

	/* if the device supports 32 MHz operation, use it. */
	if (dev->speed_32mhz) {
		ret = dev->bus->ops->set_clockrate(dev, 32);
		if (ret < 0)
			dev_err(&dev->dev, "failed to switch to 32 MHz operation.\n");
	}

	return 0;
}
EXPORT_SYMBOL_GPL(ipack_device_init);

int ipack_device_add(struct ipack_device *dev)
{
	return device_add(&dev->dev);
}
EXPORT_SYMBOL_GPL(ipack_device_add);

void ipack_device_del(struct ipack_device *dev)
{
	device_del(&dev->dev);
	ipack_put_device(dev);
}
EXPORT_SYMBOL_GPL(ipack_device_del);

void ipack_get_device(struct ipack_device *dev)
{
	get_device(&dev->dev);
}
EXPORT_SYMBOL_GPL(ipack_get_device);

void ipack_put_device(struct ipack_device *dev)
{
	put_device(&dev->dev);
}
EXPORT_SYMBOL_GPL(ipack_put_device);

static int __init ipack_init(void)
{
	ida_init(&ipack_ida);
	return bus_register(&ipack_bus_type);
}

static void __exit ipack_exit(void)
{
	bus_unregister(&ipack_bus_type);
	ida_destroy(&ipack_ida);
}

module_init(ipack_init);
module_exit(ipack_exit);

MODULE_AUTHOR("Samuel Iglesias Gonsalvez <siglesias@igalia.com>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Industry-pack bus core");
Commit	Line	Data
d3465872 SIG	1	/*
	2	* Industry-pack bus support functions.
	3	*
76859725 SIG	4	* Copyright (C) 2011-2012 CERN (www.cern.ch)
76859725 SIG	5	* Author: Samuel Iglesias Gonsalvez <siglesias@igalia.com>
d3465872 SIG	6	*
	7	* This program is free software; you can redistribute it and/or modify it
	8	* under the terms of the GNU General Public License as published by the Free
416289b1	9	* Software Foundation; version 2 of the License.
d3465872 SIG	10	*/
d3465872 SIG	11
d3465872	12	#include <linux/module.h>
ec440335	13	#include <linux/slab.h>
3b86bb2e	14	#include <linux/idr.h>
0a8f4a07	15	#include <linux/io.h>
7dbce021	16	#include <linux/ipack.h>
d3465872 SIG	17
	18	#define to_ipack_dev(device) container_of(device, struct ipack_device, dev)
	19	#define to_ipack_driver(drv) container_of(drv, struct ipack_driver, driver)
	20
3b86bb2e	21	static DEFINE_IDA(ipack_ida);
d3465872	22
ec440335 SIG	23	static void ipack_device_release(struct device *dev)
	24	{
	25	struct ipack_device *device = to_ipack_dev(dev);
187e4782	26	kfree(device->id);
1e91795c	27	device->release(device);
ec440335 SIG	28	}
ec440335 SIG	29
4aa09d47 JT	30	static inline const struct ipack_device_id *
	31	ipack_match_one_device(const struct ipack_device_id *id,
	32	const struct ipack_device *device)
d3465872	33	{
5948ae27 JT	34	if ((id->format == IPACK_ANY_FORMAT \|\|
5948ae27 JT	35	id->format == device->id_format) &&
4aa09d47 JT	36	(id->vendor == IPACK_ANY_ID \|\| id->vendor == device->id_vendor) &&
	37	(id->device == IPACK_ANY_ID \|\| id->device == device->id_device))
	38	return id;
	39	return NULL;
	40	}
d3465872	41
4aa09d47 JT	42	static const struct ipack_device_id *
	43	ipack_match_id(const struct ipack_device_id ids, struct ipack_device idev)
	44	{
	45	if (ids) {
	46	while (ids->vendor \|\| ids->device) {
	47	if (ipack_match_one_device(ids, idev))
	48	return ids;
	49	ids++;
	50	}
	51	}
	52	return NULL;
	53	}
	54
	55	static int ipack_bus_match(struct device dev, struct device_driver drv)
	56	{
	57	struct ipack_device *idev = to_ipack_dev(dev);
	58	struct ipack_driver *idrv = to_ipack_driver(drv);
	59	const struct ipack_device_id *found_id;
d3465872	60
4aa09d47	61	found_id = ipack_match_id(idrv->id_table, idev);
3bea7fcb	62	return found_id ? 1 : 0;
d3465872 SIG	63	}
	64
	65	static int ipack_bus_probe(struct device *device)
	66	{
	67	struct ipack_device *dev = to_ipack_dev(device);
3bea7fcb	68	struct ipack_driver *drv = to_ipack_driver(device->driver);
d3465872	69
3bea7fcb	70	if (!drv->ops->probe)
d3465872 SIG	71	return -EINVAL;
d3465872 SIG	72
3bea7fcb	73	return drv->ops->probe(dev);
d3465872 SIG	74	}
	75
	76	static int ipack_bus_remove(struct device *device)
	77	{
	78	struct ipack_device *dev = to_ipack_dev(device);
3bea7fcb	79	struct ipack_driver *drv = to_ipack_driver(device->driver);
d3465872	80
3bea7fcb	81	if (!drv->ops->remove)
d3465872 SIG	82	return -EINVAL;
d3465872 SIG	83
3bea7fcb	84	drv->ops->remove(dev);
d3465872 SIG	85	return 0;
	86	}
	87
35eb97bb JT	88	static int ipack_uevent(struct device dev, struct kobj_uevent_env env)
	89	{
	90	struct ipack_device *idev;
	91
	92	if (!dev)
	93	return -ENODEV;
	94
	95	idev = to_ipack_dev(dev);
	96
	97	if (add_uevent_var(env,
	98	"MODALIAS=ipack:f%02Xv%08Xd%08X", idev->id_format,
	99	idev->id_vendor, idev->id_device))
	100	return -ENOMEM;
	101
	102	return 0;
	103	}
	104
e8ed3276 JT	105	#define ipack_device_attr(field, format_string) \
	106	static ssize_t \
	107	field##_show(struct device dev, struct device_attribute attr, \
	108	char *buf) \
	109	{ \
	110	struct ipack_device *idev = to_ipack_dev(dev); \
	111	return sprintf(buf, format_string, idev->field); \
	112	}
	113
5d72c848 JT	114	static ssize_t id_show(struct device *dev,
	115	struct device_attribute attr, char buf)
	116	{
	117	unsigned int i, c, l, s;
	118	struct ipack_device *idev = to_ipack_dev(dev);
	119
	120
	121	switch (idev->id_format) {
	122	case IPACK_ID_VERSION_1:
	123	l = 0x7; s = 1; break;
	124	case IPACK_ID_VERSION_2:
	125	l = 0xf; s = 2; break;
	126	default:
	127	return -EIO;
	128	}
	129	c = 0;
	130	for (i = 0; i < idev->id_avail; i++) {
	131	if (i > 0) {
	132	if ((i & l) == 0)
	133	buf[c++] = '\n';
	134	else if ((i & s) == 0)
	135	buf[c++] = ' ';
	136	}
	137	sprintf(&buf[c], "%02x", idev->id[i]);
	138	c += 2;
	139	}
	140	buf[c++] = '\n';
	141	return c;
	142	}
	143
e8ed3276 JT	144	static ssize_t
	145	id_vendor_show(struct device dev, struct device_attribute attr, char *buf)
	146	{
	147	struct ipack_device *idev = to_ipack_dev(dev);
	148	switch (idev->id_format) {
	149	case IPACK_ID_VERSION_1:
	150	return sprintf(buf, "0x%02x\n", idev->id_vendor);
	151	case IPACK_ID_VERSION_2:
	152	return sprintf(buf, "0x%06x\n", idev->id_vendor);
	153	default:
	154	return -EIO;
	155	}
	156	}
	157
	158	static ssize_t
	159	id_device_show(struct device dev, struct device_attribute attr, char *buf)
	160	{
	161	struct ipack_device *idev = to_ipack_dev(dev);
	162	switch (idev->id_format) {
	163	case IPACK_ID_VERSION_1:
	164	return sprintf(buf, "0x%02x\n", idev->id_device);
	165	case IPACK_ID_VERSION_2:
	166	return sprintf(buf, "0x%04x\n", idev->id_device);
	167	default:
	168	return -EIO;
	169	}
	170	}
	171
35eb97bb JT	172	static ssize_t modalias_show(struct device dev, struct device_attribute attr,
	173	char *buf)
	174	{
	175	struct ipack_device *idev = to_ipack_dev(dev);
	176
	177	return sprintf(buf, "ipac:f%02Xv%08Xd%08X", idev->id_format,
	178	idev->id_vendor, idev->id_device);
	179	}
	180
e8ed3276 JT	181	ipack_device_attr(id_format, "0x%hhu\n");
e8ed3276 JT	182
5152a509 GKH	183	static DEVICE_ATTR_RO(id);
	184	static DEVICE_ATTR_RO(id_device);
	185	static DEVICE_ATTR_RO(id_format);
	186	static DEVICE_ATTR_RO(id_vendor);
	187	static DEVICE_ATTR_RO(modalias);
	188
	189	static struct attribute *ipack_attrs[] = {
	190	&dev_attr_id.attr,
	191	&dev_attr_id_device.attr,
	192	&dev_attr_id_format.attr,
	193	&dev_attr_id_vendor.attr,
	194	&dev_attr_modalias.attr,
	195	NULL,
e8ed3276	196	};
5152a509	197	ATTRIBUTE_GROUPS(ipack);
e8ed3276	198
d3465872	199	static struct bus_type ipack_bus_type = {
e8ed3276 JT	200	.name = "ipack",
	201	.probe = ipack_bus_probe,
	202	.match = ipack_bus_match,
	203	.remove = ipack_bus_remove,
5152a509	204	.dev_groups = ipack_groups,
35eb97bb	205	.uevent = ipack_uevent,
d3465872 SIG	206	};
d3465872 SIG	207
ec440335	208	struct ipack_bus_device ipack_bus_register(struct device parent, int slots,
36c53b3c FV	209	const struct ipack_bus_ops *ops,
36c53b3c FV	210	struct module *owner)
d3465872 SIG	211	{
d3465872 SIG	212	int bus_nr;
ec440335 SIG	213	struct ipack_bus_device *bus;
	214
	215	bus = kzalloc(sizeof(struct ipack_bus_device), GFP_KERNEL);
	216	if (!bus)
	217	return NULL;
d3465872	218
3b86bb2e	219	bus_nr = ida_simple_get(&ipack_ida, 0, 0, GFP_KERNEL);
ec440335 SIG	220	if (bus_nr < 0) {
	221	kfree(bus);
	222	return NULL;
	223	}
d3465872 SIG	224
d3465872 SIG	225	bus->bus_nr = bus_nr;
ec440335 SIG	226	bus->parent = parent;
	227	bus->slots = slots;
	228	bus->ops = ops;
36c53b3c	229	bus->owner = owner;
ec440335	230	return bus;
d3465872 SIG	231	}
	232	EXPORT_SYMBOL_GPL(ipack_bus_register);
	233
bffe0fd0 SIG	234	static int ipack_unregister_bus_member(struct device dev, void data)
	235	{
	236	struct ipack_device *idev = to_ipack_dev(dev);
	237	struct ipack_bus_device *bus = data;
	238
f9e314d2	239	if (idev->bus == bus)
e926301b	240	ipack_device_del(idev);
bffe0fd0 SIG	241
	242	return 1;
	243	}
	244
d3465872 SIG	245	int ipack_bus_unregister(struct ipack_bus_device *bus)
d3465872 SIG	246	{
0a8f4a07 JM	247	bus_for_each_dev(&ipack_bus_type, NULL, bus,
0a8f4a07 JM	248	ipack_unregister_bus_member);
3b86bb2e	249	ida_simple_remove(&ipack_ida, bus->bus_nr);
ec440335	250	kfree(bus);
d3465872 SIG	251	return 0;
	252	}
	253	EXPORT_SYMBOL_GPL(ipack_bus_unregister);
	254
ec440335	255	int ipack_driver_register(struct ipack_driver edrv, struct module owner,
9869a937	256	const char *name)
d3465872	257	{
ec440335 SIG	258	edrv->driver.owner = owner;
ec440335 SIG	259	edrv->driver.name = name;
d3465872 SIG	260	edrv->driver.bus = &ipack_bus_type;
	261	return driver_register(&edrv->driver);
	262	}
	263	EXPORT_SYMBOL_GPL(ipack_driver_register);
	264
	265	void ipack_driver_unregister(struct ipack_driver *edrv)
	266	{
	267	driver_unregister(&edrv->driver);
	268	}
	269	EXPORT_SYMBOL_GPL(ipack_driver_unregister);
	270
a92caeb8 JT	271	static u16 ipack_crc_byte(u16 crc, u8 c)
	272	{
	273	int i;
	274
	275	crc ^= c << 8;
	276	for (i = 0; i < 8; i++)
	277	crc = (crc << 1) ^ ((crc & 0x8000) ? 0x1021 : 0);
	278	return crc;
	279	}
	280
	281	/*
	282	* The algorithm in lib/crc-ccitt.c does not seem to apply since it uses the
	283	* opposite bit ordering.
	284	*/
	285	static u8 ipack_calc_crc1(struct ipack_device *dev)
	286	{
	287	u8 c;
	288	u16 crc;
	289	unsigned int i;
	290
	291	crc = 0xffff;
	292	for (i = 0; i < dev->id_avail; i++) {
	293	c = (i != 11) ? dev->id[i] : 0;
	294	crc = ipack_crc_byte(crc, c);
	295	}
	296	crc = ~crc;
	297	return crc & 0xff;
	298	}
	299
	300	static u16 ipack_calc_crc2(struct ipack_device *dev)
	301	{
	302	u8 c;
	303	u16 crc;
	304	unsigned int i;
	305
	306	crc = 0xffff;
	307	for (i = 0; i < dev->id_avail; i++) {
	308	c = ((i != 0x18) && (i != 0x19)) ? dev->id[i] : 0;
	309	crc = ipack_crc_byte(crc, c);
	310	}
	311	crc = ~crc;
	312	return crc;
	313	}
	314
e8ed3276 JT	315	static void ipack_parse_id1(struct ipack_device *dev)
	316	{
	317	u8 *id = dev->id;
a92caeb8	318	u8 crc;
e8ed3276 JT	319
	320	dev->id_vendor = id[4];
	321	dev->id_device = id[5];
0b0f3a1b JT	322	dev->speed_8mhz = 1;
0b0f3a1b JT	323	dev->speed_32mhz = (id[7] == 'H');
a92caeb8 JT	324	crc = ipack_calc_crc1(dev);
	325	dev->id_crc_correct = (crc == id[11]);
	326	if (!dev->id_crc_correct) {
	327	dev_warn(&dev->dev, "ID CRC invalid found 0x%x, expected 0x%x.\n",
	328	id[11], crc);
	329	}
e8ed3276 JT	330	}
	331
	332	static void ipack_parse_id2(struct ipack_device *dev)
	333	{
	334	__be16 id = (__be16 ) dev->id;
a92caeb8	335	u16 flags, crc;
e8ed3276 JT	336
	337	dev->id_vendor = ((be16_to_cpu(id[3]) & 0xff) << 16)
	338	+ be16_to_cpu(id[4]);
	339	dev->id_device = be16_to_cpu(id[5]);
0b0f3a1b JT	340	flags = be16_to_cpu(id[10]);
	341	dev->speed_8mhz = !!(flags & 2);
	342	dev->speed_32mhz = !!(flags & 4);
a92caeb8 JT	343	crc = ipack_calc_crc2(dev);
	344	dev->id_crc_correct = (crc == be16_to_cpu(id[12]));
	345	if (!dev->id_crc_correct) {
	346	dev_warn(&dev->dev, "ID CRC invalid found 0x%x, expected 0x%x.\n",
	347	id[11], crc);
	348	}
e8ed3276 JT	349	}
e8ed3276 JT	350
187e4782 JT	351	static int ipack_device_read_id(struct ipack_device *dev)
	352	{
	353	u8 __iomem *idmem;
	354	int i;
	355	int ret = 0;
	356
402228db JT	357	idmem = ioremap(dev->region[IPACK_ID_SPACE].start,
	358	dev->region[IPACK_ID_SPACE].size);
	359	if (!idmem) {
187e4782	360	dev_err(&dev->dev, "error mapping memory\n");
58b2c0ca	361	return -ENOMEM;
187e4782	362	}
187e4782 JT	363
	364	/* Determine ID PROM Data Format. If we find the ids "IPAC" or "IPAH"
	365	* we are dealing with a IndustryPack format 1 device. If we detect
	366	* "VITA4 " (16 bit big endian formatted) we are dealing with a
	367	* IndustryPack format 2 device */
	368	if ((ioread8(idmem + 1) == 'I') &&
	369	(ioread8(idmem + 3) == 'P') &&
	370	(ioread8(idmem + 5) == 'A') &&
	371	((ioread8(idmem + 7) == 'C') \|\|
	372	(ioread8(idmem + 7) == 'H'))) {
	373	dev->id_format = IPACK_ID_VERSION_1;
	374	dev->id_avail = ioread8(idmem + 0x15);
	375	if ((dev->id_avail < 0x0c) \|\| (dev->id_avail > 0x40)) {
	376	dev_warn(&dev->dev, "invalid id size");
	377	dev->id_avail = 0x0c;
	378	}
	379	} else if ((ioread8(idmem + 0) == 'I') &&
	380	(ioread8(idmem + 1) == 'V') &&
	381	(ioread8(idmem + 2) == 'A') &&
	382	(ioread8(idmem + 3) == 'T') &&
	383	(ioread8(idmem + 4) == ' ') &&
	384	(ioread8(idmem + 5) == '4')) {
	385	dev->id_format = IPACK_ID_VERSION_2;
	386	dev->id_avail = ioread16be(idmem + 0x16);
	387	if ((dev->id_avail < 0x1a) \|\| (dev->id_avail > 0x40)) {
	388	dev_warn(&dev->dev, "invalid id size");
	389	dev->id_avail = 0x1a;
	390	}
	391	} else {
	392	dev->id_format = IPACK_ID_VERSION_INVALID;
	393	dev->id_avail = 0;
	394	}
	395
	396	if (!dev->id_avail) {
	397	ret = -ENODEV;
	398	goto out;
	399	}
	400
	401	/* Obtain the amount of memory required to store a copy of the complete
	402	* ID ROM contents */
	403	dev->id = kmalloc(dev->id_avail, GFP_KERNEL);
	404	if (!dev->id) {
	405	dev_err(&dev->dev, "dev->id alloc failed.\n");
	406	ret = -ENOMEM;
	407	goto out;
	408	}
	409	for (i = 0; i < dev->id_avail; i++) {
	410	if (dev->id_format == IPACK_ID_VERSION_1)
	411	dev->id[i] = ioread8(idmem + (i << 1) + 1);
	412	else
	413	dev->id[i] = ioread8(idmem + i);
	414	}
	415
e8ed3276 JT	416	/* now we can finally work with the copy */
	417	switch (dev->id_format) {
	418	case IPACK_ID_VERSION_1:
	419	ipack_parse_id1(dev);
	420	break;
	421	case IPACK_ID_VERSION_2:
	422	ipack_parse_id2(dev);
	423	break;
	424	}
	425
187e4782	426	out:
402228db	427	iounmap(idmem);
187e4782 JT	428
	429	return ret;
	430	}
	431
e926301b	432	int ipack_device_init(struct ipack_device *dev)
d3465872 SIG	433	{
	434	int ret;
	435
	436	dev->dev.bus = &ipack_bus_type;
	437	dev->dev.release = ipack_device_release;
1e91795c	438	dev->dev.parent = dev->bus->parent;
d3465872	439	dev_set_name(&dev->dev,
f9e314d2	440	"ipack-dev.%u.%u", dev->bus->bus_nr, dev->slot);
e926301b	441	device_initialize(&dev->dev);
d3465872	442
1e91795c	443	if (dev->bus->ops->set_clockrate(dev, 8))
07766ab0	444	dev_warn(&dev->dev, "failed to switch to 8 MHz operation for reading of device ID.\n");
1e91795c	445	if (dev->bus->ops->reset_timeout(dev))
8a3ae16e	446	dev_warn(&dev->dev, "failed to reset potential timeout.");
07766ab0	447
187e4782 JT	448	ret = ipack_device_read_id(dev);
	449	if (ret < 0) {
	450	dev_err(&dev->dev, "error reading device id section.\n");
1e91795c	451	return ret;
187e4782 JT	452	}
187e4782 JT	453
90cb6194	454	/* if the device supports 32 MHz operation, use it. */
07766ab0	455	if (dev->speed_32mhz) {
1e91795c	456	ret = dev->bus->ops->set_clockrate(dev, 32);
07766ab0 JT	457	if (ret < 0)
	458	dev_err(&dev->dev, "failed to switch to 32 MHz operation.\n");
	459	}
90cb6194	460
e926301b SIG	461	return 0;
	462	}
	463	EXPORT_SYMBOL_GPL(ipack_device_init);
d3465872	464
e926301b SIG	465	int ipack_device_add(struct ipack_device *dev)
	466	{
	467	return device_add(&dev->dev);
d3465872	468	}
e926301b	469	EXPORT_SYMBOL_GPL(ipack_device_add);
d3465872	470
e926301b	471	void ipack_device_del(struct ipack_device *dev)
d3465872	472	{
e926301b SIG	473	device_del(&dev->dev);
e926301b SIG	474	ipack_put_device(dev);
d3465872	475	}
e926301b	476	EXPORT_SYMBOL_GPL(ipack_device_del);
d3465872	477
fa882867 SIG	478	void ipack_get_device(struct ipack_device *dev)
	479	{
	480	get_device(&dev->dev);
	481	}
	482	EXPORT_SYMBOL_GPL(ipack_get_device);
	483
	484	void ipack_put_device(struct ipack_device *dev)
	485	{
	486	put_device(&dev->dev);
	487	}
	488	EXPORT_SYMBOL_GPL(ipack_put_device);
	489
d3465872 SIG	490	static int __init ipack_init(void)
d3465872 SIG	491	{
3b86bb2e	492	ida_init(&ipack_ida);
d3465872 SIG	493	return bus_register(&ipack_bus_type);
	494	}
	495
	496	static void __exit ipack_exit(void)
	497	{
	498	bus_unregister(&ipack_bus_type);
3b86bb2e	499	ida_destroy(&ipack_ida);
d3465872 SIG	500	}
	501
	502	module_init(ipack_init);
	503	module_exit(ipack_exit);
	504
	505	MODULE_AUTHOR("Samuel Iglesias Gonsalvez <siglesias@igalia.com>");
	506	MODULE_LICENSE("GPL");
	507	MODULE_DESCRIPTION("Industry-pack bus core");