Staging: IndustryPack bus for the Linux Kernel
Add IndustryPack bus support for the Linux Kernel. This is a virtual bus that allows to perform all the operations between carrier and mezzanine boards. Signed-off-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Samuel Iglesias Gonsalvez
Greg Kroah-Hartman
Родитель
de8fe0233f
Коммит
d3465872c5
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@ -24,6 +24,8 @@ menuconfig STAGING
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if STAGING
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source "drivers/staging/ipack/Kconfig"
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source "drivers/staging/et131x/Kconfig"
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source "drivers/staging/slicoss/Kconfig"
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@ -30,6 +30,7 @@ obj-$(CONFIG_OCTEON_ETHERNET) += octeon/
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obj-$(CONFIG_VT6655) += vt6655/
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obj-$(CONFIG_VT6656) += vt6656/
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obj-$(CONFIG_VME_BUS) += vme/
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obj-$(CONFIG_IPACK_BUS) += ipack/
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obj-$(CONFIG_DX_SEP) += sep/
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obj-$(CONFIG_IIO) += iio/
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obj-$(CONFIG_ZRAM) += zram/
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@ -0,0 +1,9 @@
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#
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# IPACK configuration.
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#
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menuconfig IPACK_BUS
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tristate "IndustryPack bus support"
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---help---
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If you say Y here you get support for the IndustryPack Framework.
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@ -0,0 +1,4 @@
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#
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# Makefile for the IPACK bridge device drivers.
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#
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obj-$(CONFIG_IPACK_BUS) += ipack.o
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@ -0,0 +1,21 @@
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TODO
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====
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Introduction
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============
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These drivers add support for IndustryPack devices: carrier and mezzanine
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boards.
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The ipack driver is just an abstraction of the bus providing the common
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operations between the two kind of boards.
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TODO
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====
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Ipack
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-----
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* The structures and API exported can be improved a lot. For example, the
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way to unregistering mezzanine devices, doing the mezzanine driver a call to
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remove_device() to notify the carrier driver, or the opposite with the call to
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the ipack_driver_ops' remove() function could be improved.
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@ -0,0 +1,175 @@
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/*
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* Industry-pack bus support functions.
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*
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* (C) 2011 Samuel Iglesias Gonsalvez <siglesia@cern.ch>, CERN
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* (C) 2012 Samuel Iglesias Gonsalvez <siglesias@igalia.com>, Igalia
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include "ipack.h"
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#define to_ipack_dev(device) container_of(device, struct ipack_device, dev)
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#define to_ipack_driver(drv) container_of(drv, struct ipack_driver, driver)
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/* used when allocating bus numbers */
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#define IPACK_MAXBUS 64
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static DEFINE_MUTEX(ipack_mutex);
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struct ipack_busmap {
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unsigned long busmap[IPACK_MAXBUS / (8*sizeof(unsigned long))];
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};
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static struct ipack_busmap busmap;
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static int ipack_bus_match(struct device *device, struct device_driver *driver)
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{
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int ret;
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struct ipack_device *dev = to_ipack_dev(device);
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struct ipack_driver *drv = to_ipack_driver(driver);
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if (!drv->ops->match)
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return -EINVAL;
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ret = drv->ops->match(dev);
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if (ret)
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dev->driver = drv;
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return 0;
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}
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static int ipack_bus_probe(struct device *device)
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{
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struct ipack_device *dev = to_ipack_dev(device);
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if (!dev->driver->ops->probe)
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return -EINVAL;
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return dev->driver->ops->probe(dev);
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}
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static int ipack_bus_remove(struct device *device)
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{
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struct ipack_device *dev = to_ipack_dev(device);
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if (!dev->driver->ops->remove)
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return -EINVAL;
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dev->driver->ops->remove(dev);
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return 0;
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}
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static struct bus_type ipack_bus_type = {
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.name = "ipack",
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.probe = ipack_bus_probe,
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.match = ipack_bus_match,
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.remove = ipack_bus_remove,
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};
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static int ipack_assign_bus_number(void)
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{
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int busnum;
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mutex_lock(&ipack_mutex);
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busnum = find_next_zero_bit(busmap.busmap, IPACK_MAXBUS, 1);
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if (busnum >= IPACK_MAXBUS) {
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pr_err("too many buses\n");
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busnum = -1;
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goto error_find_busnum;
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}
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set_bit(busnum, busmap.busmap);
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error_find_busnum:
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mutex_unlock(&ipack_mutex);
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return busnum;
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}
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int ipack_bus_register(struct ipack_bus_device *bus)
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{
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int bus_nr;
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bus_nr = ipack_assign_bus_number();
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if (bus_nr < 0)
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return -1;
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bus->bus_nr = bus_nr;
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return 0;
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}
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EXPORT_SYMBOL_GPL(ipack_bus_register);
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int ipack_bus_unregister(struct ipack_bus_device *bus)
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{
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mutex_lock(&ipack_mutex);
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clear_bit(bus->bus_nr, busmap.busmap);
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mutex_unlock(&ipack_mutex);
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return 0;
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}
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EXPORT_SYMBOL_GPL(ipack_bus_unregister);
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int ipack_driver_register(struct ipack_driver *edrv)
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{
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edrv->driver.bus = &ipack_bus_type;
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return driver_register(&edrv->driver);
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}
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EXPORT_SYMBOL_GPL(ipack_driver_register);
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void ipack_driver_unregister(struct ipack_driver *edrv)
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{
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driver_unregister(&edrv->driver);
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}
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EXPORT_SYMBOL_GPL(ipack_driver_unregister);
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static void ipack_device_release(struct device *dev)
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{
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}
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int ipack_device_register(struct ipack_device *dev)
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{
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int ret;
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dev->dev.bus = &ipack_bus_type;
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dev->dev.release = ipack_device_release;
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dev_set_name(&dev->dev,
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"%s.%u.%u", dev->board_name, dev->bus_nr, dev->slot);
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ret = device_register(&dev->dev);
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if (ret < 0) {
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pr_err("error registering the device.\n");
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dev->driver->ops->remove(dev);
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}
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return ret;
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}
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EXPORT_SYMBOL_GPL(ipack_device_register);
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void ipack_device_unregister(struct ipack_device *dev)
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{
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device_unregister(&dev->dev);
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}
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EXPORT_SYMBOL_GPL(ipack_device_unregister);
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static int __init ipack_init(void)
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{
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return bus_register(&ipack_bus_type);
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}
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static void __exit ipack_exit(void)
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{
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bus_unregister(&ipack_bus_type);
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}
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module_init(ipack_init);
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module_exit(ipack_exit);
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MODULE_AUTHOR("Samuel Iglesias Gonsalvez <siglesias@igalia.com>");
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Industry-pack bus core");
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@ -0,0 +1,183 @@
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/*
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* Industry-pack bus.
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*
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* (C) 2011 Samuel Iglesias Gonsalvez <siglesia@cern.ch>, CERN
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* (C) 2012 Samuel Iglesias Gonsalvez <siglesias@igalia.com>, Igalia
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*/
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#include <linux/device.h>
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#define IPACK_BOARD_NAME_SIZE 16
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#define IPACK_IRQ_NAME_SIZE 50
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#define IPACK_IDPROM_OFFSET_I 0x01
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#define IPACK_IDPROM_OFFSET_P 0x03
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#define IPACK_IDPROM_OFFSET_A 0x05
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#define IPACK_IDPROM_OFFSET_C 0x07
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#define IPACK_IDPROM_OFFSET_MANUFACTURER_ID 0x09
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#define IPACK_IDPROM_OFFSET_MODEL 0x0B
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#define IPACK_IDPROM_OFFSET_REVISION 0x0D
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#define IPACK_IDPROM_OFFSET_RESERVED 0x0F
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#define IPACK_IDPROM_OFFSET_DRIVER_ID_L 0x11
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#define IPACK_IDPROM_OFFSET_DRIVER_ID_H 0x13
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#define IPACK_IDPROM_OFFSET_NUM_BYTES 0x15
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#define IPACK_IDPROM_OFFSET_CRC 0x17
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struct ipack_bus_ops;
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struct ipack_driver;
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enum ipack_space {
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IPACK_IO_SPACE = 0,
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IPACK_ID_SPACE = 1,
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IPACK_MEM_SPACE = 2,
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};
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/**
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* struct ipack_addr_space - Virtual address space mapped for a specified type.
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*
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* @address: virtual address
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* @size: size of the mapped space
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*/
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struct ipack_addr_space {
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void *address;
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unsigned int size;
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};
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/**
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* struct ipack_device
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*
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* @board_name: IP mezzanine board name
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* @bus_name: IP carrier board name
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* @bus_nr: IP bus number where the device is plugged
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* @slot: Slot where the device is plugged in the carrier board
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* @irq: IRQ vector
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* @driver: Pointer to the ipack_driver that manages the device
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* @ops: Carrier board operations to access the device
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* @id_space: Virtual address to ID space.
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* @io_space: Virtual address to IO space.
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* @mem_space: Virtual address to MEM space.
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* @dev: device in kernel representation.
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*
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* Warning: Direct access to mapped memory is possible but the endianness
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* is not the same with PCI carrier or VME carrier. The endianness is managed
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* by the carrier board throught @ops.
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*/
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struct ipack_device {
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char board_name[IPACK_BOARD_NAME_SIZE];
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char bus_name[IPACK_BOARD_NAME_SIZE];
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unsigned int bus_nr;
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unsigned int slot;
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unsigned int irq;
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struct ipack_driver *driver;
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struct ipack_bus_ops *ops;
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struct ipack_addr_space id_space;
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struct ipack_addr_space io_space;
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struct ipack_addr_space mem_space;
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struct device dev;
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};
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/*
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* struct ipack_driver_ops -- callbacks to mezzanine driver for installing/removing one device
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*
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* @match: Match function
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* @probe: Probe function
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* @remove: tell the driver that the carrier board wants to remove one device
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*/
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struct ipack_driver_ops {
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int (*match) (struct ipack_device *dev);
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int (*probe) (struct ipack_device *dev);
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void (*remove) (struct ipack_device *dev);
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};
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/**
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* struct ipack_driver -- Specific data to each mezzanine board driver
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*
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* @driver: Device driver kernel representation
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* @ops: Mezzanine driver operations specific for the ipack bus.
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*/
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struct ipack_driver {
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struct module *owner;
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struct device_driver driver;
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struct ipack_driver_ops *ops;
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};
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/*
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* ipack_driver_register -- Register a new mezzanine driver
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*
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* Called by the mezzanine driver to register itself as a driver
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* that can manage ipack devices.
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*/
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int ipack_driver_register(struct ipack_driver *edrv);
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void ipack_driver_unregister(struct ipack_driver *edrv);
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/*
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* ipack_device_register -- register a new mezzanine device
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*
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* Register a new ipack device (mezzanine device). The call is done by
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* the carrier device driver.
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*/
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int ipack_device_register(struct ipack_device *dev);
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void ipack_device_unregister(struct ipack_device *dev);
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/**
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* struct ipack_bus_ops - available operations on a bridge module
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*
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* @map_space: map IP address space
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* @unmap_space: unmap IP address space
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* @request_irq: request IRQ
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* @free_irq: free IRQ
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* @read8: read unsigned char
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* @read16: read unsigned short
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* @read32: read unsigned int
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* @write8: read unsigned char
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* @write16: read unsigned short
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* @write32: read unsigned int
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* @remove_device: tell the bridge module that the device has been removed
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*/
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struct ipack_bus_ops {
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int (*map_space) (struct ipack_device *dev, unsigned int memory_size, int space);
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int (*unmap_space) (struct ipack_device *dev, int space);
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int (*request_irq) (struct ipack_device *dev, int vector, int (*handler)(void *), void *arg);
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int (*free_irq) (struct ipack_device *dev);
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int (*read8) (struct ipack_device *dev, int space, unsigned long offset, unsigned char *value);
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int (*read16) (struct ipack_device *dev, int space, unsigned long offset, unsigned short *value);
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int (*read32) (struct ipack_device *dev, int space, unsigned long offset, unsigned int *value);
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int (*write8) (struct ipack_device *dev, int space, unsigned long offset, unsigned char value);
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int (*write16) (struct ipack_device *dev, int space, unsigned long offset, unsigned short value);
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int (*write32) (struct ipack_device *dev, int space, unsigned long offset, unsigned int value);
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int (*remove_device) (struct ipack_device *dev);
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};
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/**
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* struct ipack_bus_device
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*
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* @dev: pointer to carrier device
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* @slots: number of slots available
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* @bus_nr: ipack bus number
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* @vector: IRQ base vector. IRQ vectors are $vector + $slot_number
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*/
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struct ipack_bus_device {
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struct device *dev;
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int slots;
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int bus_nr;
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int vector;
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};
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/**
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* ipack_bus_register -- register a new ipack bus
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*
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* The carrier board device driver should call this function to register itself
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* as available bus in ipack.
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*/
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int ipack_bus_register(struct ipack_bus_device *bus);
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/**
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* ipack_bus_unregister -- unregister an ipack bus
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*/
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int ipack_bus_unregister(struct ipack_bus_device *bus);
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