1 files changed, 481 insertions, 0 deletions

diff --git a/drivers/ipack/ipack.c b/drivers/ipack/ipack.c
new file mode 100644
index 000000000000..6d5079de52b9
--- /dev/null
+++ b/drivers/ipack/ipack.c
@@ -0,0 +1,481 @@
+/*
+ * 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 "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 struct device_attribute ipack_dev_attrs[] = {
+	__ATTR_RO(id),
+	__ATTR_RO(id_device),
+	__ATTR_RO(id_format),
+	__ATTR_RO(id_vendor),
+	__ATTR_RO(modalias),
+};
+
+static struct bus_type ipack_bus_type = {
+	.name      = "ipack",
+	.probe     = ipack_bus_probe,
+	.match     = ipack_bus_match,
+	.remove    = ipack_bus_remove,
+	.dev_attrs = ipack_dev_attrs,
+	.uevent	   = ipack_uevent,
+};
+
+struct ipack_bus_device *ipack_bus_register(struct device *parent, int slots,
+					    const struct ipack_bus_ops *ops)
+{
+	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;
+	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_unregister(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_register(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);
+
+	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");
+	}
+
+	ret = device_register(&dev->dev);
+	if (ret < 0)
+		kfree(dev->id);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(ipack_device_register);
+
+void ipack_device_unregister(struct ipack_device *dev)
+{
+	device_unregister(&dev->dev);
+}
+EXPORT_SYMBOL_GPL(ipack_device_unregister);
+
+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");