--- /dev/null
+/*
+ * Industry-pack bus support functions.
+ *
+ * (C) 2011 Samuel Iglesias Gonsalvez <siglesia@cern.ch>, CERN
+ * (C) 2012 Samuel Iglesias Gonsalvez <siglesias@igalia.com>, Igalia
+ *
+ * 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, or (at your option)
+ * any later version.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/mutex.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)
+
+/* used when allocating bus numbers */
+#define IPACK_MAXBUS 64
+
+static DEFINE_MUTEX(ipack_mutex);
+
+struct ipack_busmap {
+ unsigned long busmap[IPACK_MAXBUS / (8*sizeof(unsigned long))];
+};
+static struct ipack_busmap busmap;
+
+static int ipack_bus_match(struct device *device, struct device_driver *driver)
+{
+ int ret;
+ struct ipack_device *dev = to_ipack_dev(device);
+ struct ipack_driver *drv = to_ipack_driver(driver);
+
+ if (!drv->ops->match)
+ return -EINVAL;
+
+ ret = drv->ops->match(dev);
+ if (ret)
+ dev->driver = drv;
+
+ return 0;
+}
+
+static int ipack_bus_probe(struct device *device)
+{
+ struct ipack_device *dev = to_ipack_dev(device);
+
+ if (!dev->driver->ops->probe)
+ return -EINVAL;
+
+ return dev->driver->ops->probe(dev);
+}
+
+static int ipack_bus_remove(struct device *device)
+{
+ struct ipack_device *dev = to_ipack_dev(device);
+
+ if (!dev->driver->ops->remove)
+ return -EINVAL;
+
+ dev->driver->ops->remove(dev);
+ return 0;
+}
+
+static struct bus_type ipack_bus_type = {
+ .name = "ipack",
+ .probe = ipack_bus_probe,
+ .match = ipack_bus_match,
+ .remove = ipack_bus_remove,
+};
+
+static int ipack_assign_bus_number(void)
+{
+ int busnum;
+
+ mutex_lock(&ipack_mutex);
+ busnum = find_next_zero_bit(busmap.busmap, IPACK_MAXBUS, 1);
+
+ if (busnum >= IPACK_MAXBUS) {
+ pr_err("too many buses\n");
+ busnum = -1;
+ goto error_find_busnum;
+ }
+
+ set_bit(busnum, busmap.busmap);
+
+error_find_busnum:
+ mutex_unlock(&ipack_mutex);
+ return busnum;
+}
+
+int ipack_bus_register(struct ipack_bus_device *bus)
+{
+ int bus_nr;
+
+ bus_nr = ipack_assign_bus_number();
+ if (bus_nr < 0)
+ return -1;
+
+ bus->bus_nr = bus_nr;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ipack_bus_register);
+
+int ipack_bus_unregister(struct ipack_bus_device *bus)
+{
+ mutex_lock(&ipack_mutex);
+ clear_bit(bus->bus_nr, busmap.busmap);
+ mutex_unlock(&ipack_mutex);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ipack_bus_unregister);
+
+int ipack_driver_register(struct ipack_driver *edrv)
+{
+ 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 void ipack_device_release(struct device *dev)
+{
+}
+
+int ipack_device_register(struct ipack_device *dev)
+{
+ int ret;
+
+ dev->dev.bus = &ipack_bus_type;
+ dev->dev.release = ipack_device_release;
+ dev_set_name(&dev->dev,
+ "%s.%u.%u", dev->board_name, dev->bus_nr, dev->slot);
+
+ ret = device_register(&dev->dev);
+ if (ret < 0) {
+ pr_err("error registering the device.\n");
+ dev->driver->ops->remove(dev);
+ }
+
+ 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)
+{
+ return bus_register(&ipack_bus_type);
+}
+
+static void __exit ipack_exit(void)
+{
+ bus_unregister(&ipack_bus_type);
+}
+
+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");
--- /dev/null
+/*
+ * Industry-pack bus.
+ *
+ * (C) 2011 Samuel Iglesias Gonsalvez <siglesia@cern.ch>, CERN
+ * (C) 2012 Samuel Iglesias Gonsalvez <siglesias@igalia.com>, Igalia
+ *
+ * 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, or (at your option)
+ * any later version.
+ */
+
+#include <linux/device.h>
+
+#define IPACK_BOARD_NAME_SIZE 16
+#define IPACK_IRQ_NAME_SIZE 50
+#define IPACK_IDPROM_OFFSET_I 0x01
+#define IPACK_IDPROM_OFFSET_P 0x03
+#define IPACK_IDPROM_OFFSET_A 0x05
+#define IPACK_IDPROM_OFFSET_C 0x07
+#define IPACK_IDPROM_OFFSET_MANUFACTURER_ID 0x09
+#define IPACK_IDPROM_OFFSET_MODEL 0x0B
+#define IPACK_IDPROM_OFFSET_REVISION 0x0D
+#define IPACK_IDPROM_OFFSET_RESERVED 0x0F
+#define IPACK_IDPROM_OFFSET_DRIVER_ID_L 0x11
+#define IPACK_IDPROM_OFFSET_DRIVER_ID_H 0x13
+#define IPACK_IDPROM_OFFSET_NUM_BYTES 0x15
+#define IPACK_IDPROM_OFFSET_CRC 0x17
+
+struct ipack_bus_ops;
+struct ipack_driver;
+
+enum ipack_space {
+ IPACK_IO_SPACE = 0,
+ IPACK_ID_SPACE = 1,
+ IPACK_MEM_SPACE = 2,
+};
+
+/**
+ * struct ipack_addr_space - Virtual address space mapped for a specified type.
+ *
+ * @address: virtual address
+ * @size: size of the mapped space
+ */
+struct ipack_addr_space {
+ void *address;
+ unsigned int size;
+};
+
+/**
+ * struct ipack_device
+ *
+ * @board_name: IP mezzanine board name
+ * @bus_name: IP carrier board name
+ * @bus_nr: IP bus number where the device is plugged
+ * @slot: Slot where the device is plugged in the carrier board
+ * @irq: IRQ vector
+ * @driver: Pointer to the ipack_driver that manages the device
+ * @ops: Carrier board operations to access the device
+ * @id_space: Virtual address to ID space.
+ * @io_space: Virtual address to IO space.
+ * @mem_space: Virtual address to MEM space.
+ * @dev: device in kernel representation.
+ *
+ * Warning: Direct access to mapped memory is possible but the endianness
+ * is not the same with PCI carrier or VME carrier. The endianness is managed
+ * by the carrier board throught @ops.
+ */
+struct ipack_device {
+ char board_name[IPACK_BOARD_NAME_SIZE];
+ char bus_name[IPACK_BOARD_NAME_SIZE];
+ unsigned int bus_nr;
+ unsigned int slot;
+ unsigned int irq;
+ struct ipack_driver *driver;
+ struct ipack_bus_ops *ops;
+ struct ipack_addr_space id_space;
+ struct ipack_addr_space io_space;
+ struct ipack_addr_space mem_space;
+ struct device dev;
+};
+
+/*
+ * struct ipack_driver_ops -- callbacks to mezzanine driver for installing/removing one device
+ *
+ * @match: Match function
+ * @probe: Probe function
+ * @remove: tell the driver that the carrier board wants to remove one device
+ */
+
+struct ipack_driver_ops {
+ int (*match) (struct ipack_device *dev);
+ int (*probe) (struct ipack_device *dev);
+ void (*remove) (struct ipack_device *dev);
+};
+
+/**
+ * struct ipack_driver -- Specific data to each mezzanine board driver
+ *
+ * @driver: Device driver kernel representation
+ * @ops: Mezzanine driver operations specific for the ipack bus.
+ */
+struct ipack_driver {
+ struct module *owner;
+ struct device_driver driver;
+ struct ipack_driver_ops *ops;
+};
+
+/*
+ * ipack_driver_register -- Register a new mezzanine driver
+ *
+ * Called by the mezzanine driver to register itself as a driver
+ * that can manage ipack devices.
+ */
+
+int ipack_driver_register(struct ipack_driver *edrv);
+void ipack_driver_unregister(struct ipack_driver *edrv);
+
+/*
+ * ipack_device_register -- register a new mezzanine device
+ *
+ * Register a new ipack device (mezzanine device). The call is done by
+ * the carrier device driver.
+ */
+int ipack_device_register(struct ipack_device *dev);
+void ipack_device_unregister(struct ipack_device *dev);
+
+/**
+ * struct ipack_bus_ops - available operations on a bridge module
+ *
+ * @map_space: map IP address space
+ * @unmap_space: unmap IP address space
+ * @request_irq: request IRQ
+ * @free_irq: free IRQ
+ * @read8: read unsigned char
+ * @read16: read unsigned short
+ * @read32: read unsigned int
+ * @write8: read unsigned char
+ * @write16: read unsigned short
+ * @write32: read unsigned int
+ * @remove_device: tell the bridge module that the device has been removed
+ */
+struct ipack_bus_ops {
+ int (*map_space) (struct ipack_device *dev, unsigned int memory_size, int space);
+ int (*unmap_space) (struct ipack_device *dev, int space);
+ int (*request_irq) (struct ipack_device *dev, int vector, int (*handler)(void *), void *arg);
+ int (*free_irq) (struct ipack_device *dev);
+ int (*read8) (struct ipack_device *dev, int space, unsigned long offset, unsigned char *value);
+ int (*read16) (struct ipack_device *dev, int space, unsigned long offset, unsigned short *value);
+ int (*read32) (struct ipack_device *dev, int space, unsigned long offset, unsigned int *value);
+ int (*write8) (struct ipack_device *dev, int space, unsigned long offset, unsigned char value);
+ int (*write16) (struct ipack_device *dev, int space, unsigned long offset, unsigned short value);
+ int (*write32) (struct ipack_device *dev, int space, unsigned long offset, unsigned int value);
+ int (*remove_device) (struct ipack_device *dev);
+};
+
+/**
+ * struct ipack_bus_device
+ *
+ * @dev: pointer to carrier device
+ * @slots: number of slots available
+ * @bus_nr: ipack bus number
+ * @vector: IRQ base vector. IRQ vectors are $vector + $slot_number
+ */
+struct ipack_bus_device {
+ struct device *dev;
+ int slots;
+ int bus_nr;
+ int vector;
+};
+
+/**
+ * ipack_bus_register -- register a new ipack bus
+ *
+ * The carrier board device driver should call this function to register itself
+ * as available bus in ipack.
+ */
+int ipack_bus_register(struct ipack_bus_device *bus);
+
+/**
+ * ipack_bus_unregister -- unregister an ipack bus
+ */
+int ipack_bus_unregister(struct ipack_bus_device *bus);
projects / platform / kernel / linux-exynos.git / commitdiff