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12d04eef92
This patch completely refactors DMA operations for 64 bits powerpc. 32 bits is untouched for now. We use the new dev_archdata structure to add the dma operations pointer and associated data to struct device. While at it, we also add the OF node pointer and numa node. In the future, we might want to look into merging that with pci_dn as well. The old vio, pci-iommu and pci-direct DMA ops are gone. They are now replaced by a set of generic iommu and direct DMA ops (non PCI specific) that can be used by bus types. The toplevel implementation is now inline. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
396 lines
9.5 KiB
C
396 lines
9.5 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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static 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, const 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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dev->ofdev.dev.archdata.of_node = dev->ofdev.node;
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dev->ofdev.dev.archdata.dma_ops = &ibmebus_dma_ops;
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dev->ofdev.dev.archdata.numa_node = of_node_to_nid(dev->ofdev.node);
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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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const char *loc_code;
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int length;
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loc_code = 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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irq_handler_t handler,
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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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