474 lines
11 KiB
C
474 lines
11 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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* Joachim Fenkes <fenkes@de.ibm.com>
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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/export.h>
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#include <linux/console.h>
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#include <linux/kobject.h>
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#include <linux/dma-map-ops.h>
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#include <linux/interrupt.h>
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#include <linux/irqdomain.h>
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#include <linux/of.h>
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#include <linux/slab.h>
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#include <linux/stat.h>
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#include <linux/of_platform.h>
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#include <asm/ibmebus.h>
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#include <asm/machdep.h>
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static struct device ibmebus_bus_device = { /* fake "parent" device */
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.init_name = "ibmebus",
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};
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struct bus_type ibmebus_bus_type;
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/* These devices will automatically be added to the bus during init */
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static const struct of_device_id ibmebus_matches[] __initconst = {
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{ .compatible = "IBM,lhca" },
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{ .compatible = "IBM,lhea" },
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{},
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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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unsigned long attrs)
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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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unsigned long attrs)
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{
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kfree(vaddr);
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}
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static dma_addr_t ibmebus_map_page(struct device *dev,
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struct page *page,
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unsigned long offset,
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size_t size,
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enum dma_data_direction direction,
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unsigned long attrs)
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{
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return (dma_addr_t)(page_address(page) + offset);
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}
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static void ibmebus_unmap_page(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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unsigned long attrs)
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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 *sgl,
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int nents, enum dma_data_direction direction,
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unsigned long attrs)
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{
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struct scatterlist *sg;
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int i;
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for_each_sg(sgl, sg, nents, i) {
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sg->dma_address = (dma_addr_t) sg_virt(sg);
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sg->dma_length = sg->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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unsigned long attrs)
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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 mask == DMA_BIT_MASK(64);
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}
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static u64 ibmebus_dma_get_required_mask(struct device *dev)
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{
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return DMA_BIT_MASK(64);
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}
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static const struct dma_map_ops ibmebus_dma_ops = {
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.alloc = ibmebus_alloc_coherent,
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.free = ibmebus_free_coherent,
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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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.get_required_mask = ibmebus_dma_get_required_mask,
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.map_page = ibmebus_map_page,
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.unmap_page = ibmebus_unmap_page,
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};
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static int ibmebus_match_path(struct device *dev, const void *data)
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{
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struct device_node *dn = to_platform_device(dev)->dev.of_node;
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struct device_node *tn = of_find_node_by_path(data);
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of_node_put(tn);
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return (tn == dn);
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}
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static int ibmebus_match_node(struct device *dev, const void *data)
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{
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return to_platform_device(dev)->dev.of_node == data;
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}
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static int ibmebus_create_device(struct device_node *dn)
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{
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struct platform_device *dev;
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int ret;
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dev = of_device_alloc(dn, NULL, &ibmebus_bus_device);
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if (!dev)
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return -ENOMEM;
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dev->dev.bus = &ibmebus_bus_type;
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dev->dev.dma_ops = &ibmebus_dma_ops;
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ret = of_device_add(dev);
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if (ret)
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platform_device_put(dev);
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return ret;
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}
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static int ibmebus_create_devices(const struct of_device_id *matches)
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{
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struct device_node *root, *child;
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struct device *dev;
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int ret = 0;
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root = of_find_node_by_path("/");
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for_each_child_of_node(root, child) {
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if (!of_match_node(matches, child))
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continue;
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dev = bus_find_device(&ibmebus_bus_type, NULL, child,
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ibmebus_match_node);
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if (dev) {
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put_device(dev);
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continue;
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}
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ret = ibmebus_create_device(child);
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if (ret) {
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printk(KERN_ERR "%s: failed to create device (%i)",
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__func__, ret);
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of_node_put(child);
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break;
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}
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}
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of_node_put(root);
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return ret;
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}
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int ibmebus_register_driver(struct platform_driver *drv)
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{
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/* If the driver uses devices that ibmebus doesn't know, add them */
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ibmebus_create_devices(drv->driver.of_match_table);
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drv->driver.bus = &ibmebus_bus_type;
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return driver_register(&drv->driver);
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}
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EXPORT_SYMBOL(ibmebus_register_driver);
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void ibmebus_unregister_driver(struct platform_driver *drv)
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{
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driver_unregister(&drv->driver);
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}
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EXPORT_SYMBOL(ibmebus_unregister_driver);
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int ibmebus_request_irq(u32 ist, 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)
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return -EINVAL;
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return request_irq(irq, handler, 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(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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irq_dispose_mapping(irq);
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}
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EXPORT_SYMBOL(ibmebus_free_irq);
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static char *ibmebus_chomp(const char *in, size_t count)
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{
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char *out = kmalloc(count + 1, GFP_KERNEL);
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if (!out)
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return NULL;
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memcpy(out, in, count);
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out[count] = '\0';
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if (out[count - 1] == '\n')
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out[count - 1] = '\0';
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return out;
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}
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static ssize_t probe_store(struct bus_type *bus, const char *buf, size_t count)
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{
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struct device_node *dn = NULL;
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struct device *dev;
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char *path;
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ssize_t rc = 0;
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path = ibmebus_chomp(buf, count);
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if (!path)
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return -ENOMEM;
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dev = bus_find_device(&ibmebus_bus_type, NULL, path,
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ibmebus_match_path);
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if (dev) {
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put_device(dev);
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printk(KERN_WARNING "%s: %s has already been probed\n",
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__func__, path);
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rc = -EEXIST;
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goto out;
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}
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if ((dn = of_find_node_by_path(path))) {
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rc = ibmebus_create_device(dn);
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of_node_put(dn);
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} else {
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printk(KERN_WARNING "%s: no such device node: %s\n",
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__func__, path);
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rc = -ENODEV;
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}
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out:
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kfree(path);
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if (rc)
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return rc;
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return count;
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}
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static BUS_ATTR_WO(probe);
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static ssize_t remove_store(struct bus_type *bus, const char *buf, size_t count)
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{
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struct device *dev;
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char *path;
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path = ibmebus_chomp(buf, count);
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if (!path)
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return -ENOMEM;
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if ((dev = bus_find_device(&ibmebus_bus_type, NULL, path,
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ibmebus_match_path))) {
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of_device_unregister(to_platform_device(dev));
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put_device(dev);
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kfree(path);
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return count;
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} else {
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printk(KERN_WARNING "%s: %s not on the bus\n",
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__func__, path);
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kfree(path);
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return -ENODEV;
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}
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}
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static BUS_ATTR_WO(remove);
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static struct attribute *ibmbus_bus_attrs[] = {
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&bus_attr_probe.attr,
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&bus_attr_remove.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(ibmbus_bus);
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static int ibmebus_bus_bus_match(struct device *dev, struct device_driver *drv)
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{
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const struct of_device_id *matches = drv->of_match_table;
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if (!matches)
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return 0;
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return of_match_device(matches, dev) != NULL;
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}
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static int ibmebus_bus_device_probe(struct device *dev)
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{
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int error = -ENODEV;
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struct platform_driver *drv;
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struct platform_device *of_dev;
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drv = to_platform_driver(dev->driver);
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of_dev = to_platform_device(dev);
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if (!drv->probe)
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return error;
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get_device(dev);
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if (of_driver_match_device(dev, dev->driver))
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error = drv->probe(of_dev);
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if (error)
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put_device(dev);
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return error;
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}
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static void ibmebus_bus_device_remove(struct device *dev)
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{
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struct platform_device *of_dev = to_platform_device(dev);
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struct platform_driver *drv = to_platform_driver(dev->driver);
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if (dev->driver && drv->remove)
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drv->remove(of_dev);
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}
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static void ibmebus_bus_device_shutdown(struct device *dev)
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{
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struct platform_device *of_dev = to_platform_device(dev);
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struct platform_driver *drv = to_platform_driver(dev->driver);
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if (dev->driver && drv->shutdown)
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drv->shutdown(of_dev);
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}
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/*
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* ibmebus_bus_device_attrs
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*/
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static ssize_t devspec_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct platform_device *ofdev;
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ofdev = to_platform_device(dev);
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return sprintf(buf, "%pOF\n", ofdev->dev.of_node);
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}
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static DEVICE_ATTR_RO(devspec);
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static ssize_t name_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct platform_device *ofdev;
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ofdev = to_platform_device(dev);
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return sprintf(buf, "%pOFn\n", ofdev->dev.of_node);
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}
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static DEVICE_ATTR_RO(name);
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static ssize_t modalias_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return of_device_modalias(dev, buf, PAGE_SIZE);
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}
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static DEVICE_ATTR_RO(modalias);
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static struct attribute *ibmebus_bus_device_attrs[] = {
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&dev_attr_devspec.attr,
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&dev_attr_name.attr,
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&dev_attr_modalias.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(ibmebus_bus_device);
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struct bus_type ibmebus_bus_type = {
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.name = "ibmebus",
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.uevent = of_device_uevent_modalias,
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.bus_groups = ibmbus_bus_groups,
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.match = ibmebus_bus_bus_match,
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.probe = ibmebus_bus_device_probe,
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.remove = ibmebus_bus_device_remove,
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.shutdown = ibmebus_bus_device_shutdown,
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.dev_groups = ibmebus_bus_device_groups,
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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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__func__);
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return err;
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}
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err = device_register(&ibmebus_bus_device);
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if (err) {
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printk(KERN_WARNING "%s: device_register returned %i\n",
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__func__, err);
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put_device(&ibmebus_bus_device);
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bus_unregister(&ibmebus_bus_type);
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return err;
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}
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err = ibmebus_create_devices(ibmebus_matches);
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if (err) {
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device_unregister(&ibmebus_bus_device);
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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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machine_postcore_initcall(pseries, ibmebus_bus_init);
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