--- /dev/null
+/*
+ * 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");
Code Review / kvmfornfv.git / blobdiff