/* * IBM PowerPC IBM eBus Infrastructure Support. * * Copyright (c) 2005 IBM Corporation * 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 static struct ibmebus_dev ibmebus_bus_device = { /* fake "parent" device */ .name = ibmebus_bus_device.ofdev.dev.bus_id, .ofdev.dev.bus_id = "ibmebus", .ofdev.dev.bus = &ibmebus_bus_type, }; 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_single(struct device *dev, void *ptr, size_t size, enum dma_data_direction direction) { return (dma_addr_t)(ptr); } static void ibmebus_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size, enum dma_data_direction direction) { return; } static int ibmebus_map_sg(struct device *dev, struct scatterlist *sg, int nents, enum dma_data_direction direction) { int i; for (i = 0; i < nents; i++) { sg[i].dma_address = (dma_addr_t)page_address(sg[i].page) + sg[i].offset; sg[i].dma_length = sg[i].length; } return nents; } static void ibmebus_unmap_sg(struct device *dev, struct scatterlist *sg, int nents, enum dma_data_direction direction) { return; } static int ibmebus_dma_supported(struct device *dev, u64 mask) { return 1; } struct dma_mapping_ops ibmebus_dma_ops = { .alloc_coherent = ibmebus_alloc_coherent, .free_coherent = ibmebus_free_coherent, .map_single = ibmebus_map_single, .unmap_single = ibmebus_unmap_single, .map_sg = ibmebus_map_sg, .unmap_sg = ibmebus_unmap_sg, .dma_supported = ibmebus_dma_supported, }; static int ibmebus_bus_probe(struct device *dev) { struct ibmebus_dev *ibmebusdev = to_ibmebus_dev(dev); struct ibmebus_driver *ibmebusdrv = to_ibmebus_driver(dev->driver); const struct of_device_id *id; int error = -ENODEV; if (!ibmebusdrv->probe) return error; id = of_match_device(ibmebusdrv->id_table, &ibmebusdev->ofdev); if (id) { error = ibmebusdrv->probe(ibmebusdev, id); } return error; } static int ibmebus_bus_remove(struct device *dev) { struct ibmebus_dev *ibmebusdev = to_ibmebus_dev(dev); struct ibmebus_driver *ibmebusdrv = to_ibmebus_driver(dev->driver); if (ibmebusdrv->remove) { return ibmebusdrv->remove(ibmebusdev); } return 0; } static void __devinit ibmebus_dev_release(struct device *dev) { of_node_put(to_ibmebus_dev(dev)->ofdev.node); kfree(to_ibmebus_dev(dev)); } static ssize_t ibmebusdev_show_name(struct device *dev, struct device_attribute *attr, char *buf) { return sprintf(buf, "%s\n", to_ibmebus_dev(dev)->name); } static DEVICE_ATTR(name, S_IRUSR | S_IRGRP | S_IROTH, ibmebusdev_show_name, NULL); static struct ibmebus_dev* __devinit ibmebus_register_device_common( struct ibmebus_dev *dev, char *name) { int err = 0; dev->name = name; dev->ofdev.dev.parent = &ibmebus_bus_device.ofdev.dev; dev->ofdev.dev.bus = &ibmebus_bus_type; dev->ofdev.dev.release = ibmebus_dev_release; /* An ibmebusdev is based on a of_device. We have to change the * bus type to use our own DMA mapping operations. */ if ((err = of_device_register(&dev->ofdev)) != 0) { printk(KERN_ERR "%s: failed to register device (%d).\n", __FUNCTION__, err); return NULL; } device_create_file(&dev->ofdev.dev, &dev_attr_name); return dev; } static struct ibmebus_dev* __devinit ibmebus_register_device_node( struct device_node *dn) { struct ibmebus_dev *dev; char *loc_code; int length; loc_code = (char *)get_property(dn, "ibm,loc-code", NULL); if (!loc_code) { printk(KERN_WARNING "%s: node %s missing 'ibm,loc-code'\n", __FUNCTION__, dn->name ? dn->name : ""); return NULL; } if (strlen(loc_code) == 0) { printk(KERN_WARNING "%s: 'ibm,loc-code' is invalid\n", __FUNCTION__); return NULL; } dev = kmalloc(sizeof(struct ibmebus_dev), GFP_KERNEL); if (!dev) { return NULL; } memset(dev, 0, sizeof(struct ibmebus_dev)); dev->ofdev.node = of_node_get(dn); length = strlen(loc_code); memcpy(dev->ofdev.dev.bus_id, loc_code + (length - min(length, BUS_ID_SIZE - 1)), min(length, BUS_ID_SIZE - 1)); /* Register with generic device framework. */ if (ibmebus_register_device_common(dev, dn->name) == NULL) { kfree(dev); return NULL; } return dev; } static void ibmebus_probe_of_nodes(char* name) { struct device_node *dn = NULL; while ((dn = of_find_node_by_name(dn, name))) { if (ibmebus_register_device_node(dn) == NULL) { of_node_put(dn); return; } } of_node_put(dn); return; } static void ibmebus_add_devices_by_id(struct of_device_id *idt) { while (strlen(idt->name) > 0) { ibmebus_probe_of_nodes(idt->name); idt++; } return; } static int ibmebus_match_helper(struct device *dev, void *data) { if (strcmp((char*)data, to_ibmebus_dev(dev)->name) == 0) return 1; return 0; } static int ibmebus_unregister_device(struct device *dev) { device_remove_file(dev, &dev_attr_name); of_device_unregister(to_of_device(dev)); return 0; } static void ibmebus_remove_devices_by_id(struct of_device_id *idt) { struct device *dev; while (strlen(idt->name) > 0) { while ((dev = bus_find_device(&ibmebus_bus_type, NULL, (void*)idt->name, ibmebus_match_helper))) { ibmebus_unregister_device(dev); } idt++; } return; } int ibmebus_register_driver(struct ibmebus_driver *drv) { int err = 0; drv->driver.name = drv->name; drv->driver.bus = &ibmebus_bus_type; drv->driver.probe = ibmebus_bus_probe; drv->driver.remove = ibmebus_bus_remove; if ((err = driver_register(&drv->driver) != 0)) return err; ibmebus_add_devices_by_id(drv->id_table); return 0; } EXPORT_SYMBOL(ibmebus_register_driver); void ibmebus_unregister_driver(struct ibmebus_driver *drv) { driver_unregister(&drv->driver); ibmebus_remove_devices_by_id(drv->id_table); } EXPORT_SYMBOL(ibmebus_unregister_driver); int ibmebus_request_irq(struct ibmebus_dev *dev, u32 ist, irqreturn_t (*handler)(int, void*, struct pt_regs *), unsigned long irq_flags, const char * devname, void *dev_id) { unsigned int irq = virt_irq_create_mapping(ist); if (irq == NO_IRQ) return -EINVAL; irq = irq_offset_up(irq); return request_irq(irq, handler, irq_flags, devname, dev_id); } EXPORT_SYMBOL(ibmebus_request_irq); void ibmebus_free_irq(struct ibmebus_dev *dev, u32 ist, void *dev_id) { unsigned int irq = virt_irq_create_mapping(ist); irq = irq_offset_up(irq); free_irq(irq, dev_id); return; } EXPORT_SYMBOL(ibmebus_free_irq); static int ibmebus_bus_match(struct device *dev, struct device_driver *drv) { const struct ibmebus_dev *ebus_dev = to_ibmebus_dev(dev); struct ibmebus_driver *ebus_drv = to_ibmebus_driver(drv); const struct of_device_id *ids = ebus_drv->id_table; const struct of_device_id *found_id; if (!ids) return 0; found_id = of_match_device(ids, &ebus_dev->ofdev); if (found_id) return 1; return 0; } struct bus_type ibmebus_bus_type = { .name = "ibmebus", .match = ibmebus_bus_match, }; 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", __FUNCTION__); return err; } err = device_register(&ibmebus_bus_device.ofdev.dev); if (err) { printk(KERN_WARNING "%s: device_register returned %i\n", __FUNCTION__, err); bus_unregister(&ibmebus_bus_type); return err; } return 0; } __initcall(ibmebus_bus_init);