392 строки
9.3 KiB
C
392 строки
9.3 KiB
C
/*
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* IBM PowerPC IBM eBus Infrastructure Support.
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*
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* Copyright (c) 2005 IBM Corporation
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* Heiko J Schick <schickhj@de.ibm.com>
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*
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* All rights reserved.
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*
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* This source code is distributed under a dual license of GPL v2.0 and OpenIB
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* BSD.
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*
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* OpenIB BSD License
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials
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* provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
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* IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <linux/init.h>
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#include <linux/console.h>
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#include <linux/kobject.h>
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#include <linux/dma-mapping.h>
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#include <linux/interrupt.h>
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#include <asm/ibmebus.h>
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#include <asm/abs_addr.h>
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static struct ibmebus_dev ibmebus_bus_device = { /* fake "parent" device */
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.name = ibmebus_bus_device.ofdev.dev.bus_id,
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.ofdev.dev.bus_id = "ibmebus",
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.ofdev.dev.bus = &ibmebus_bus_type,
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};
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static void *ibmebus_alloc_coherent(struct device *dev,
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size_t size,
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dma_addr_t *dma_handle,
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gfp_t flag)
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{
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void *mem;
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mem = kmalloc(size, flag);
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*dma_handle = (dma_addr_t)mem;
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return mem;
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}
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static void ibmebus_free_coherent(struct device *dev,
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size_t size, void *vaddr,
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dma_addr_t dma_handle)
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{
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kfree(vaddr);
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}
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static dma_addr_t ibmebus_map_single(struct device *dev,
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void *ptr,
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size_t size,
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enum dma_data_direction direction)
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{
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return (dma_addr_t)(ptr);
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}
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static void ibmebus_unmap_single(struct device *dev,
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dma_addr_t dma_addr,
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size_t size,
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enum dma_data_direction direction)
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{
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return;
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}
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static int ibmebus_map_sg(struct device *dev,
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struct scatterlist *sg,
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int nents, enum dma_data_direction direction)
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{
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int i;
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for (i = 0; i < nents; i++) {
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sg[i].dma_address = (dma_addr_t)page_address(sg[i].page)
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+ sg[i].offset;
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sg[i].dma_length = sg[i].length;
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}
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return nents;
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}
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static void ibmebus_unmap_sg(struct device *dev,
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struct scatterlist *sg,
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int nents, enum dma_data_direction direction)
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{
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return;
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}
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static int ibmebus_dma_supported(struct device *dev, u64 mask)
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{
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return 1;
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}
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struct dma_mapping_ops ibmebus_dma_ops = {
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.alloc_coherent = ibmebus_alloc_coherent,
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.free_coherent = ibmebus_free_coherent,
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.map_single = ibmebus_map_single,
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.unmap_single = ibmebus_unmap_single,
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.map_sg = ibmebus_map_sg,
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.unmap_sg = ibmebus_unmap_sg,
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.dma_supported = ibmebus_dma_supported,
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};
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static int ibmebus_bus_probe(struct device *dev)
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{
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struct ibmebus_dev *ibmebusdev = to_ibmebus_dev(dev);
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struct ibmebus_driver *ibmebusdrv = to_ibmebus_driver(dev->driver);
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const struct of_device_id *id;
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int error = -ENODEV;
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if (!ibmebusdrv->probe)
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return error;
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id = of_match_device(ibmebusdrv->id_table, &ibmebusdev->ofdev);
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if (id) {
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error = ibmebusdrv->probe(ibmebusdev, id);
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}
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return error;
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}
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static int ibmebus_bus_remove(struct device *dev)
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{
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struct ibmebus_dev *ibmebusdev = to_ibmebus_dev(dev);
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struct ibmebus_driver *ibmebusdrv = to_ibmebus_driver(dev->driver);
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if (ibmebusdrv->remove) {
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return ibmebusdrv->remove(ibmebusdev);
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}
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return 0;
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}
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static void __devinit ibmebus_dev_release(struct device *dev)
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{
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of_node_put(to_ibmebus_dev(dev)->ofdev.node);
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kfree(to_ibmebus_dev(dev));
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}
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static ssize_t ibmebusdev_show_name(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return sprintf(buf, "%s\n", to_ibmebus_dev(dev)->name);
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}
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static DEVICE_ATTR(name, S_IRUSR | S_IRGRP | S_IROTH, ibmebusdev_show_name,
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NULL);
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static struct ibmebus_dev* __devinit ibmebus_register_device_common(
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struct ibmebus_dev *dev, char *name)
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{
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int err = 0;
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dev->name = name;
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dev->ofdev.dev.parent = &ibmebus_bus_device.ofdev.dev;
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dev->ofdev.dev.bus = &ibmebus_bus_type;
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dev->ofdev.dev.release = ibmebus_dev_release;
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/* An ibmebusdev is based on a of_device. We have to change the
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* bus type to use our own DMA mapping operations.
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*/
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if ((err = of_device_register(&dev->ofdev)) != 0) {
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printk(KERN_ERR "%s: failed to register device (%d).\n",
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__FUNCTION__, err);
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return NULL;
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}
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device_create_file(&dev->ofdev.dev, &dev_attr_name);
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return dev;
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}
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static struct ibmebus_dev* __devinit ibmebus_register_device_node(
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struct device_node *dn)
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{
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struct ibmebus_dev *dev;
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char *loc_code;
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int length;
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loc_code = (char *)get_property(dn, "ibm,loc-code", NULL);
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if (!loc_code) {
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printk(KERN_WARNING "%s: node %s missing 'ibm,loc-code'\n",
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__FUNCTION__, dn->name ? dn->name : "<unknown>");
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return NULL;
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}
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if (strlen(loc_code) == 0) {
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printk(KERN_WARNING "%s: 'ibm,loc-code' is invalid\n",
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__FUNCTION__);
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return NULL;
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}
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dev = kmalloc(sizeof(struct ibmebus_dev), GFP_KERNEL);
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if (!dev) {
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return NULL;
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}
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memset(dev, 0, sizeof(struct ibmebus_dev));
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dev->ofdev.node = of_node_get(dn);
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length = strlen(loc_code);
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memcpy(dev->ofdev.dev.bus_id, loc_code
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+ (length - min(length, BUS_ID_SIZE - 1)),
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min(length, BUS_ID_SIZE - 1));
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/* Register with generic device framework. */
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if (ibmebus_register_device_common(dev, dn->name) == NULL) {
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kfree(dev);
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return NULL;
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}
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return dev;
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}
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static void ibmebus_probe_of_nodes(char* name)
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{
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struct device_node *dn = NULL;
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while ((dn = of_find_node_by_name(dn, name))) {
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if (ibmebus_register_device_node(dn) == NULL) {
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of_node_put(dn);
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return;
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}
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}
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of_node_put(dn);
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return;
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}
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static void ibmebus_add_devices_by_id(struct of_device_id *idt)
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{
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while (strlen(idt->name) > 0) {
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ibmebus_probe_of_nodes(idt->name);
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idt++;
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}
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return;
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}
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static int ibmebus_match_helper(struct device *dev, void *data)
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{
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if (strcmp((char*)data, to_ibmebus_dev(dev)->name) == 0)
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return 1;
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return 0;
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}
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static int ibmebus_unregister_device(struct device *dev)
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{
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device_remove_file(dev, &dev_attr_name);
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of_device_unregister(to_of_device(dev));
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return 0;
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}
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static void ibmebus_remove_devices_by_id(struct of_device_id *idt)
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{
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struct device *dev;
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while (strlen(idt->name) > 0) {
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while ((dev = bus_find_device(&ibmebus_bus_type, NULL,
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(void*)idt->name,
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ibmebus_match_helper))) {
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ibmebus_unregister_device(dev);
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}
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idt++;
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}
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return;
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}
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int ibmebus_register_driver(struct ibmebus_driver *drv)
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{
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int err = 0;
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drv->driver.name = drv->name;
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drv->driver.bus = &ibmebus_bus_type;
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drv->driver.probe = ibmebus_bus_probe;
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drv->driver.remove = ibmebus_bus_remove;
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if ((err = driver_register(&drv->driver) != 0))
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return err;
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ibmebus_add_devices_by_id(drv->id_table);
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return 0;
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}
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EXPORT_SYMBOL(ibmebus_register_driver);
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void ibmebus_unregister_driver(struct ibmebus_driver *drv)
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{
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driver_unregister(&drv->driver);
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ibmebus_remove_devices_by_id(drv->id_table);
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}
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EXPORT_SYMBOL(ibmebus_unregister_driver);
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int ibmebus_request_irq(struct ibmebus_dev *dev,
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u32 ist,
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irqreturn_t (*handler)(int, void*, struct pt_regs *),
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unsigned long irq_flags, const char * devname,
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void *dev_id)
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{
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unsigned int irq = irq_create_mapping(NULL, ist);
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if (irq == NO_IRQ)
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return -EINVAL;
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return request_irq(irq, handler,
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irq_flags, devname, dev_id);
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}
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EXPORT_SYMBOL(ibmebus_request_irq);
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void ibmebus_free_irq(struct ibmebus_dev *dev, u32 ist, void *dev_id)
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{
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unsigned int irq = irq_find_mapping(NULL, ist);
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free_irq(irq, dev_id);
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}
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EXPORT_SYMBOL(ibmebus_free_irq);
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static int ibmebus_bus_match(struct device *dev, struct device_driver *drv)
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{
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const struct ibmebus_dev *ebus_dev = to_ibmebus_dev(dev);
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struct ibmebus_driver *ebus_drv = to_ibmebus_driver(drv);
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const struct of_device_id *ids = ebus_drv->id_table;
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const struct of_device_id *found_id;
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if (!ids)
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return 0;
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found_id = of_match_device(ids, &ebus_dev->ofdev);
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if (found_id)
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return 1;
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return 0;
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}
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struct bus_type ibmebus_bus_type = {
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.name = "ibmebus",
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.match = ibmebus_bus_match,
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};
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EXPORT_SYMBOL(ibmebus_bus_type);
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static int __init ibmebus_bus_init(void)
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{
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int err;
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printk(KERN_INFO "IBM eBus Device Driver\n");
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err = bus_register(&ibmebus_bus_type);
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if (err) {
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printk(KERN_ERR ":%s: failed to register IBM eBus.\n",
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__FUNCTION__);
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return err;
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}
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err = device_register(&ibmebus_bus_device.ofdev.dev);
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if (err) {
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printk(KERN_WARNING "%s: device_register returned %i\n",
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__FUNCTION__, err);
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bus_unregister(&ibmebus_bus_type);
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return err;
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}
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return 0;
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}
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__initcall(ibmebus_bus_init);
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