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468 lines
11 KiB
468 lines
11 KiB
/* |
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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 <[email protected]> |
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* Heiko J Schick <[email protected]> |
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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/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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return (of_find_node_by_path(data) == 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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of_dev_get(of_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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of_dev_put(of_dev); |
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return error; |
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} |
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static int 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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return 0; |
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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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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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