| /* |
| * 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 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, void *data) |
| { |
| struct device_node *dn = to_platform_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_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.archdata.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 ibmebus_store_probe(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(probe, S_IWUSR, NULL, ibmebus_store_probe); |
| |
| 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_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(remove, S_IWUSR, NULL, ibmebus_store_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, "%s\n", ofdev->dev.of_node->full_name); |
| } |
| |
| 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, "%s\n", ofdev->dev.of_node->name); |
| } |
| |
| static ssize_t modalias_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| ssize_t len = of_device_get_modalias(dev, buf, PAGE_SIZE - 2); |
| buf[len] = '\n'; |
| buf[len+1] = 0; |
| return len+1; |
| } |
| |
| static struct device_attribute ibmebus_bus_device_attrs[] = { |
| __ATTR_RO(devspec), |
| __ATTR_RO(name), |
| __ATTR_RO(modalias), |
| __ATTR_NULL |
| }; |
| |
| 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_attrs = ibmebus_bus_device_attrs, |
| }; |
| 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); |