/* * IBM PowerPC IBM eBus Infrastructure Support. * * Copyright (c) 2005 IBM Corporation * Joachim Fenkes <fenkes@de.ibm.com> * Heiko J Schick <schickhj@de.ibm.com> * * 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 <linux/init.h> #include <linux/export.h> #include <linux/console.h> #include <linux/kobject.h> #include <linux/dma-mapping.h> #include <linux/interrupt.h> #include <linux/of.h> #include <linux/slab.h> #include <linux/stat.h> #include <linux/of_platform.h> #include <asm/ibmebus.h> 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 const struct of_device_id ibmebus_matches[] __initconst = { { .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, unsigned long attrs) { 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, unsigned long attrs) { 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, unsigned long 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, unsigned long attrs) { return; } static int ibmebus_map_sg(struct device *dev, struct scatterlist *sgl, int nents, enum dma_data_direction direction, unsigned long 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, unsigned long attrs) { return; } static int ibmebus_dma_supported(struct device *dev, u64 mask) { return mask == DMA_BIT_MASK(64); } static u64 ibmebus_dma_get_required_mask(struct device *dev) { return DMA_BIT_MASK(64); } static const struct dma_map_ops ibmebus_dma_ops = { .alloc = ibmebus_alloc_coherent, .free = ibmebus_free_coherent, .map_sg = ibmebus_map_sg, .unmap_sg = ibmebus_unmap_sg, .dma_supported = ibmebus_dma_supported, .get_required_mask = ibmebus_dma_get_required_mask, .map_page = ibmebus_map_page, .unmap_page = ibmebus_unmap_page, }; static int ibmebus_match_path(struct device *dev, const void *data) { struct device_node *dn = to_platform_device(dev)->dev.of_node; return (of_find_node_by_path(data) == dn); } static int ibmebus_match_node(struct device *dev, const void *data) { return to_platform_device(dev)->dev.of_node == data; } static int ibmebus_create_device(struct device_node *dn) { struct platform_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.dma_ops = &ibmebus_dma_ops; ret = of_device_add(dev); if (ret) platform_device_put(dev); return ret; } static int ibmebus_create_devices(const struct of_device_id *matches) { struct device_node *root, *child; struct device *dev; int ret = 0; root = of_find_node_by_path("/"); for_each_child_of_node(root, child) { if (!of_match_node(matches, child)) continue; dev = bus_find_device(&ibmebus_bus_type, NULL, child, ibmebus_match_node); if (dev) { put_device(dev); 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 platform_driver *drv) { /* If the driver uses devices that ibmebus doesn't know, add them */ ibmebus_create_devices(drv->driver.of_match_table); drv->driver.bus = &ibmebus_bus_type; return driver_register(&drv->driver); } EXPORT_SYMBOL(ibmebus_register_driver); void ibmebus_unregister_driver(struct platform_driver *drv) { driver_unregister(&drv->driver); } 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) 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 probe_store(struct bus_type *bus, const char *buf, size_t count) { struct device_node *dn = NULL; struct device *dev; char *path; ssize_t rc = 0; path = ibmebus_chomp(buf, count); if (!path) return -ENOMEM; dev = bus_find_device(&ibmebus_bus_type, NULL, path, ibmebus_match_path); if (dev) { put_device(dev); 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 BUS_ATTR_WO(probe); static ssize_t remove_store(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_platform_device(dev)); put_device(dev); kfree(path); return count; } else { printk(KERN_WARNING "%s: %s not on the bus\n", __func__, path); kfree(path); return -ENODEV; } } static BUS_ATTR_WO(remove); static struct attribute *ibmbus_bus_attrs[] = { &bus_attr_probe.attr, &bus_attr_remove.attr, NULL, }; ATTRIBUTE_GROUPS(ibmbus_bus); static int ibmebus_bus_bus_match(struct device *dev, struct device_driver *drv) { const struct of_device_id *matches = drv->of_match_table; if (!matches) return 0; return of_match_device(matches, dev) != NULL; } static int ibmebus_bus_device_probe(struct device *dev) { int error = -ENODEV; struct platform_driver *drv; struct platform_device *of_dev; drv = to_platform_driver(dev->driver); of_dev = to_platform_device(dev); if (!drv->probe) return error; of_dev_get(of_dev); if (of_driver_match_device(dev, dev->driver)) error = drv->probe(of_dev); if (error) of_dev_put(of_dev); return error; } static int ibmebus_bus_device_remove(struct device *dev) { struct platform_device *of_dev = to_platform_device(dev); struct platform_driver *drv = to_platform_driver(dev->driver); if (dev->driver && drv->remove) drv->remove(of_dev); return 0; } static void ibmebus_bus_device_shutdown(struct device *dev) { struct platform_device *of_dev = to_platform_device(dev); struct platform_driver *drv = to_platform_driver(dev->driver); if (dev->driver && drv->shutdown) drv->shutdown(of_dev); } /* * ibmebus_bus_device_attrs */ static ssize_t devspec_show(struct device *dev, struct device_attribute *attr, char *buf) { struct platform_device *ofdev; ofdev = to_platform_device(dev); return sprintf(buf, "%pOF\n", ofdev->dev.of_node); } static DEVICE_ATTR_RO(devspec); static ssize_t name_show(struct device *dev, struct device_attribute *attr, char *buf) { struct platform_device *ofdev; ofdev = to_platform_device(dev); return sprintf(buf, "%pOFn\n", ofdev->dev.of_node); } static DEVICE_ATTR_RO(name); static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf) { return of_device_modalias(dev, buf, PAGE_SIZE); } static DEVICE_ATTR_RO(modalias); static struct attribute *ibmebus_bus_device_attrs[] = { &dev_attr_devspec.attr, &dev_attr_name.attr, &dev_attr_modalias.attr, NULL, }; ATTRIBUTE_GROUPS(ibmebus_bus_device); struct bus_type ibmebus_bus_type = { .name = "ibmebus", .uevent = of_device_uevent_modalias, .bus_groups = ibmbus_bus_groups, .match = ibmebus_bus_bus_match, .probe = ibmebus_bus_device_probe, .remove = ibmebus_bus_device_remove, .shutdown = ibmebus_bus_device_shutdown, .dev_groups = ibmebus_bus_device_groups, }; EXPORT_SYMBOL(ibmebus_bus_type); static int __init ibmebus_bus_init(void) { int err; printk(KERN_INFO "IBM eBus Device Driver\n"); err = bus_register(&ibmebus_bus_type); 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);