/* * IBM PowerPC IBM eBus Infrastructure Support. * * Copyright (c) 2005 IBM Corporation * Joachim Fenkes * Heiko J Schick * * All rights reserved. * * This source code is distributed under a dual license of GPL v2.0 and OpenIB * BSD. * * OpenIB BSD License * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * Redistributions of source code must retain the above copyright notice, this * list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials * provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include #include #include #include #include #include #include #include #include #include static struct device ibmebus_bus_device = { /* fake "parent" device */ .init_name = "ibmebus", }; struct bus_type ibmebus_bus_type; /* These devices will automatically be added to the bus during init */ static struct of_device_id __initdata ibmebus_matches[] = { { .compatible = "IBM,lhca" }, { .compatible = "IBM,lhea" }, {}, }; static void *ibmebus_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t flag) { void *mem; mem = kmalloc(size, flag); *dma_handle = (dma_addr_t)mem; return mem; } static void ibmebus_free_coherent(struct device *dev, size_t size, void *vaddr, dma_addr_t dma_handle) { kfree(vaddr); } static dma_addr_t ibmebus_map_page(struct device *dev, struct page *page, unsigned long offset, size_t size, enum dma_data_direction direction, struct dma_attrs *attrs) { return (dma_addr_t)(page_address(page) + offset); } static void ibmebus_unmap_page(struct device *dev, dma_addr_t dma_addr, size_t size, enum dma_data_direction direction, struct dma_attrs *attrs) { return; } static int ibmebus_map_sg(struct device *dev, struct scatterlist *sgl, int nents, enum dma_data_direction direction, struct dma_attrs *attrs) { struct scatterlist *sg; int i; for_each_sg(sgl, sg, nents, i) { sg->dma_address = (dma_addr_t) sg_virt(sg); sg->dma_length = sg->length; } return nents; } static void ibmebus_unmap_sg(struct device *dev, struct scatterlist *sg, int nents, enum dma_data_direction direction, struct dma_attrs *attrs) { return; } static int ibmebus_dma_supported(struct device *dev, u64 mask) { return 1; } static struct dma_map_ops ibmebus_dma_ops = { .alloc_coherent = ibmebus_alloc_coherent, .free_coherent = ibmebus_free_coherent, .map_sg = ibmebus_map_sg, .unmap_sg = ibmebus_unmap_sg, .dma_supported = ibmebus_dma_supported, .map_page = ibmebus_map_page, .unmap_page = ibmebus_unmap_page, }; static int ibmebus_match_path(struct device *dev, void *data) { struct device_node *dn = to_of_device(dev)->dev.of_node; return (dn->full_name && (strcasecmp((char *)data, dn->full_name) == 0)); } static int ibmebus_match_node(struct device *dev, void *data) { return to_of_device(dev)->dev.of_node == data; } static int ibmebus_create_device(struct device_node *dn) { struct of_device *dev; int ret; dev = of_device_alloc(dn, NULL, &ibmebus_bus_device); if (!dev) return -ENOMEM; dev->dev.bus = &ibmebus_bus_type; dev->dev.archdata.dma_ops = &ibmebus_dma_ops; ret = of_device_register(dev); if (ret) { of_device_free(dev); return ret; } return 0; } static int ibmebus_create_devices(const struct of_device_id *matches) { struct device_node *root, *child; int ret = 0; root = of_find_node_by_path("/"); for_each_child_of_node(root, child) { if (!of_match_node(matches, child)) continue; if (bus_find_device(&ibmebus_bus_type, NULL, child, ibmebus_match_node)) continue; ret = ibmebus_create_device(child); if (ret) { printk(KERN_ERR "%s: failed to create device (%i)", __func__, ret); of_node_put(child); break; } } of_node_put(root); return ret; } int ibmebus_register_driver(struct of_platform_driver *drv) { /* If the driver uses devices that ibmebus doesn't know, add them */ ibmebus_create_devices(drv->match_table); return of_register_driver(drv, &ibmebus_bus_type); } EXPORT_SYMBOL(ibmebus_register_driver); void ibmebus_unregister_driver(struct of_platform_driver *drv) { of_unregister_driver(drv); } EXPORT_SYMBOL(ibmebus_unregister_driver); int ibmebus_request_irq(u32 ist, irq_handler_t handler, unsigned long irq_flags, const char *devname, void *dev_id) { unsigned int irq = irq_create_mapping(NULL, ist); if (irq == NO_IRQ) return -EINVAL; return request_irq(irq, handler, irq_flags, devname, dev_id); } EXPORT_SYMBOL(ibmebus_request_irq); void ibmebus_free_irq(u32 ist, void *dev_id) { unsigned int irq = irq_find_mapping(NULL, ist); free_irq(irq, dev_id); irq_dispose_mapping(irq); } EXPORT_SYMBOL(ibmebus_free_irq); static char *ibmebus_chomp(const char *in, size_t count) { char *out = kmalloc(count + 1, GFP_KERNEL); if (!out) return NULL; memcpy(out, in, count); out[count] = '\0'; if (out[count - 1] == '\n') out[count - 1] = '\0'; return out; } static ssize_t ibmebus_store_probe(struct bus_type *bus, const char *buf, size_t count) { struct device_node *dn = NULL; char *path; ssize_t rc = 0; path = ibmebus_chomp(buf, count); if (!path) return -ENOMEM; if (bus_find_device(&ibmebus_bus_type, NULL, path, ibmebus_match_path)) { printk(KERN_WARNING "%s: %s has already been probed\n", __func__, path); rc = -EEXIST; goto out; } if ((dn = of_find_node_by_path(path))) { rc = ibmebus_create_device(dn); of_node_put(dn); } else { printk(KERN_WARNING "%s: no such device node: %s\n", __func__, path); rc = -ENODEV; } out: kfree(path); if (rc) return rc; return count; } static ssize_t ibmebus_store_remove(struct bus_type *bus, const char *buf, size_t count) { struct device *dev; char *path; path = ibmebus_chomp(buf, count); if (!path) return -ENOMEM; if ((dev = bus_find_device(&ibmebus_bus_type, NULL, path, ibmebus_match_path))) { of_device_unregister(to_of_device(dev)); kfree(path); return count; } else { printk(KERN_WARNING "%s: %s not on the bus\n", __func__, path); kfree(path); return -ENODEV; } } static struct bus_attribute ibmebus_bus_attrs[] = { __ATTR(probe, S_IWUSR, NULL, ibmebus_store_probe), __ATTR(remove, S_IWUSR, NULL, ibmebus_store_remove), __ATTR_NULL }; struct bus_type ibmebus_bus_type = { .uevent = of_device_uevent, .bus_attrs = ibmebus_bus_attrs }; EXPORT_SYMBOL(ibmebus_bus_type); static int __init ibmebus_bus_init(void) { int err; printk(KERN_INFO "IBM eBus Device Driver\n"); err = of_bus_type_init(&ibmebus_bus_type, "ibmebus"); if (err) { printk(KERN_ERR "%s: failed to register IBM eBus.\n", __func__); return err; } err = device_register(&ibmebus_bus_device); if (err) { printk(KERN_WARNING "%s: device_register returned %i\n", __func__, err); bus_unregister(&ibmebus_bus_type); return err; } err = ibmebus_create_devices(ibmebus_matches); if (err) { device_unregister(&ibmebus_bus_device); bus_unregister(&ibmebus_bus_type); return err; } return 0; } postcore_initcall(ibmebus_bus_init);