diff options
Diffstat (limited to 'arch/powerpc/kernel/ibmebus.c')
| -rw-r--r-- | arch/powerpc/kernel/ibmebus.c | 759 |
1 files changed, 759 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/ibmebus.c b/arch/powerpc/kernel/ibmebus.c new file mode 100644 index 000000000..ac86c53e2 --- /dev/null +++ b/arch/powerpc/kernel/ibmebus.c @@ -0,0 +1,759 @@ +/* + * 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, + struct dma_attrs *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, + struct dma_attrs *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, + 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 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; + 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 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 == 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 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)); + + 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; +} + +struct device_attribute ibmebus_bus_device_attrs[] = { + __ATTR_RO(devspec), + __ATTR_RO(name), + __ATTR_RO(modalias), + __ATTR_NULL +}; + +#ifdef CONFIG_PM_SLEEP +static int ibmebus_bus_legacy_suspend(struct device *dev, pm_message_t mesg) +{ + struct platform_device *of_dev = to_platform_device(dev); + struct platform_driver *drv = to_platform_driver(dev->driver); + int ret = 0; + + if (dev->driver && drv->suspend) + ret = drv->suspend(of_dev, mesg); + return ret; +} + +static int ibmebus_bus_legacy_resume(struct device *dev) +{ + struct platform_device *of_dev = to_platform_device(dev); + struct platform_driver *drv = to_platform_driver(dev->driver); + int ret = 0; + + if (dev->driver && drv->resume) + ret = drv->resume(of_dev); + return ret; +} + +static int ibmebus_bus_pm_prepare(struct device *dev) +{ + struct device_driver *drv = dev->driver; + int ret = 0; + + if (drv && drv->pm && drv->pm->prepare) + ret = drv->pm->prepare(dev); + + return ret; +} + +static void ibmebus_bus_pm_complete(struct device *dev) +{ + struct device_driver *drv = dev->driver; + + if (drv && drv->pm && drv->pm->complete) + drv->pm->complete(dev); +} + +#ifdef CONFIG_SUSPEND + +static int ibmebus_bus_pm_suspend(struct device *dev) +{ + struct device_driver *drv = dev->driver; + int ret = 0; + + if (!drv) + return 0; + + if (drv->pm) { + if (drv->pm->suspend) + ret = drv->pm->suspend(dev); + } else { + ret = ibmebus_bus_legacy_suspend(dev, PMSG_SUSPEND); + } + + return ret; +} + +static int ibmebus_bus_pm_suspend_noirq(struct device *dev) +{ + struct device_driver *drv = dev->driver; + int ret = 0; + + if (!drv) + return 0; + + if (drv->pm) { + if (drv->pm->suspend_noirq) + ret = drv->pm->suspend_noirq(dev); + } + + return ret; +} + +static int ibmebus_bus_pm_resume(struct device *dev) +{ + struct device_driver *drv = dev->driver; + int ret = 0; + + if (!drv) + return 0; + + if (drv->pm) { + if (drv->pm->resume) + ret = drv->pm->resume(dev); + } else { + ret = ibmebus_bus_legacy_resume(dev); + } + + return ret; +} + +static int ibmebus_bus_pm_resume_noirq(struct device *dev) +{ + struct device_driver *drv = dev->driver; + int ret = 0; + + if (!drv) + return 0; + + if (drv->pm) { + if (drv->pm->resume_noirq) + ret = drv->pm->resume_noirq(dev); + } + + return ret; +} + +#else /* !CONFIG_SUSPEND */ + +#define ibmebus_bus_pm_suspend NULL +#define ibmebus_bus_pm_resume NULL +#define ibmebus_bus_pm_suspend_noirq NULL +#define ibmebus_bus_pm_resume_noirq NULL + +#endif /* !CONFIG_SUSPEND */ + +#ifdef CONFIG_HIBERNATE_CALLBACKS + +static int ibmebus_bus_pm_freeze(struct device *dev) +{ + struct device_driver *drv = dev->driver; + int ret = 0; + + if (!drv) + return 0; + + if (drv->pm) { + if (drv->pm->freeze) + ret = drv->pm->freeze(dev); + } else { + ret = ibmebus_bus_legacy_suspend(dev, PMSG_FREEZE); + } + + return ret; +} + +static int ibmebus_bus_pm_freeze_noirq(struct device *dev) +{ + struct device_driver *drv = dev->driver; + int ret = 0; + + if (!drv) + return 0; + + if (drv->pm) { + if (drv->pm->freeze_noirq) + ret = drv->pm->freeze_noirq(dev); + } + + return ret; +} + +static int ibmebus_bus_pm_thaw(struct device *dev) +{ + struct device_driver *drv = dev->driver; + int ret = 0; + + if (!drv) + return 0; + + if (drv->pm) { + if (drv->pm->thaw) + ret = drv->pm->thaw(dev); + } else { + ret = ibmebus_bus_legacy_resume(dev); + } + + return ret; +} + +static int ibmebus_bus_pm_thaw_noirq(struct device *dev) +{ + struct device_driver *drv = dev->driver; + int ret = 0; + + if (!drv) + return 0; + + if (drv->pm) { + if (drv->pm->thaw_noirq) + ret = drv->pm->thaw_noirq(dev); + } + + return ret; +} + +static int ibmebus_bus_pm_poweroff(struct device *dev) +{ + struct device_driver *drv = dev->driver; + int ret = 0; + + if (!drv) + return 0; + + if (drv->pm) { + if (drv->pm->poweroff) + ret = drv->pm->poweroff(dev); + } else { + ret = ibmebus_bus_legacy_suspend(dev, PMSG_HIBERNATE); + } + + return ret; +} + +static int ibmebus_bus_pm_poweroff_noirq(struct device *dev) +{ + struct device_driver *drv = dev->driver; + int ret = 0; + + if (!drv) + return 0; + + if (drv->pm) { + if (drv->pm->poweroff_noirq) + ret = drv->pm->poweroff_noirq(dev); + } + + return ret; +} + +static int ibmebus_bus_pm_restore(struct device *dev) +{ + struct device_driver *drv = dev->driver; + int ret = 0; + + if (!drv) + return 0; + + if (drv->pm) { + if (drv->pm->restore) + ret = drv->pm->restore(dev); + } else { + ret = ibmebus_bus_legacy_resume(dev); + } + + return ret; +} + +static int ibmebus_bus_pm_restore_noirq(struct device *dev) +{ + struct device_driver *drv = dev->driver; + int ret = 0; + + if (!drv) + return 0; + + if (drv->pm) { + if (drv->pm->restore_noirq) + ret = drv->pm->restore_noirq(dev); + } + + return ret; +} + +#else /* !CONFIG_HIBERNATE_CALLBACKS */ + +#define ibmebus_bus_pm_freeze NULL +#define ibmebus_bus_pm_thaw NULL +#define ibmebus_bus_pm_poweroff NULL +#define ibmebus_bus_pm_restore NULL +#define ibmebus_bus_pm_freeze_noirq NULL +#define ibmebus_bus_pm_thaw_noirq NULL +#define ibmebus_bus_pm_poweroff_noirq NULL +#define ibmebus_bus_pm_restore_noirq NULL + +#endif /* !CONFIG_HIBERNATE_CALLBACKS */ + +static struct dev_pm_ops ibmebus_bus_dev_pm_ops = { + .prepare = ibmebus_bus_pm_prepare, + .complete = ibmebus_bus_pm_complete, + .suspend = ibmebus_bus_pm_suspend, + .resume = ibmebus_bus_pm_resume, + .freeze = ibmebus_bus_pm_freeze, + .thaw = ibmebus_bus_pm_thaw, + .poweroff = ibmebus_bus_pm_poweroff, + .restore = ibmebus_bus_pm_restore, + .suspend_noirq = ibmebus_bus_pm_suspend_noirq, + .resume_noirq = ibmebus_bus_pm_resume_noirq, + .freeze_noirq = ibmebus_bus_pm_freeze_noirq, + .thaw_noirq = ibmebus_bus_pm_thaw_noirq, + .poweroff_noirq = ibmebus_bus_pm_poweroff_noirq, + .restore_noirq = ibmebus_bus_pm_restore_noirq, +}; + +#define IBMEBUS_BUS_PM_OPS_PTR (&ibmebus_bus_dev_pm_ops) + +#else /* !CONFIG_PM_SLEEP */ + +#define IBMEBUS_BUS_PM_OPS_PTR NULL + +#endif /* !CONFIG_PM_SLEEP */ + +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, + .pm = IBMEBUS_BUS_PM_OPS_PTR, +}; +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); |