9309180f11
Devices with no "reg" nor "dcr-reg" property are given a bus_id which is the node name alone. This means that if more than one such device with the same names are present in the system, sysfs will have collisions when creating the symlinks and will fail registering the devices. This works around that problem by assigning successive numbers to such devices. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
489 lines
12 KiB
C
489 lines
12 KiB
C
/*
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* Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp.
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* <benh@kernel.crashing.org>
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* and Arnd Bergmann, IBM Corp.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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*/
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#undef DEBUG
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/mod_devicetable.h>
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#include <linux/slab.h>
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#include <linux/pci.h>
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#include <asm/errno.h>
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#include <asm/dcr.h>
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#include <asm/of_device.h>
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#include <asm/of_platform.h>
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#include <asm/topology.h>
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#include <asm/pci-bridge.h>
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#include <asm/ppc-pci.h>
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#include <asm/atomic.h>
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/*
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* The list of OF IDs below is used for matching bus types in the
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* system whose devices are to be exposed as of_platform_devices.
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*
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* This is the default list valid for most platforms. This file provides
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* functions who can take an explicit list if necessary though
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*
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* The search is always performed recursively looking for children of
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* the provided device_node and recursively if such a children matches
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* a bus type in the list
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*/
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static struct of_device_id of_default_bus_ids[] = {
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{ .type = "soc", },
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{ .compatible = "soc", },
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{ .type = "spider", },
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{ .type = "axon", },
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{ .type = "plb5", },
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{ .type = "plb4", },
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{ .type = "opb", },
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{},
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};
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static atomic_t bus_no_reg_magic;
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/*
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*
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* OF platform device type definition & base infrastructure
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*
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*/
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static int of_platform_bus_match(struct device *dev, struct device_driver *drv)
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{
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struct of_device * of_dev = to_of_device(dev);
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struct of_platform_driver * of_drv = to_of_platform_driver(drv);
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const struct of_device_id * matches = of_drv->match_table;
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if (!matches)
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return 0;
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return of_match_device(matches, of_dev) != NULL;
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}
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static int of_platform_device_probe(struct device *dev)
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{
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int error = -ENODEV;
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struct of_platform_driver *drv;
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struct of_device *of_dev;
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const struct of_device_id *match;
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drv = to_of_platform_driver(dev->driver);
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of_dev = to_of_device(dev);
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if (!drv->probe)
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return error;
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of_dev_get(of_dev);
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match = of_match_device(drv->match_table, of_dev);
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if (match)
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error = drv->probe(of_dev, match);
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if (error)
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of_dev_put(of_dev);
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return error;
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}
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static int of_platform_device_remove(struct device *dev)
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{
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struct of_device * of_dev = to_of_device(dev);
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struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
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if (dev->driver && drv->remove)
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drv->remove(of_dev);
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return 0;
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}
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static int of_platform_device_suspend(struct device *dev, pm_message_t state)
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{
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struct of_device * of_dev = to_of_device(dev);
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struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
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int error = 0;
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if (dev->driver && drv->suspend)
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error = drv->suspend(of_dev, state);
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return error;
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}
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static int of_platform_device_resume(struct device * dev)
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{
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struct of_device * of_dev = to_of_device(dev);
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struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
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int error = 0;
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if (dev->driver && drv->resume)
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error = drv->resume(of_dev);
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return error;
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}
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struct bus_type of_platform_bus_type = {
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.name = "of_platform",
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.match = of_platform_bus_match,
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.probe = of_platform_device_probe,
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.remove = of_platform_device_remove,
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.suspend = of_platform_device_suspend,
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.resume = of_platform_device_resume,
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};
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EXPORT_SYMBOL(of_platform_bus_type);
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static int __init of_bus_driver_init(void)
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{
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return bus_register(&of_platform_bus_type);
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}
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postcore_initcall(of_bus_driver_init);
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int of_register_platform_driver(struct of_platform_driver *drv)
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{
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/* initialize common driver fields */
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drv->driver.name = drv->name;
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drv->driver.bus = &of_platform_bus_type;
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/* register with core */
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return driver_register(&drv->driver);
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}
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EXPORT_SYMBOL(of_register_platform_driver);
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void of_unregister_platform_driver(struct of_platform_driver *drv)
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{
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driver_unregister(&drv->driver);
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}
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EXPORT_SYMBOL(of_unregister_platform_driver);
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static void of_platform_make_bus_id(struct of_device *dev)
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{
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struct device_node *node = dev->node;
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char *name = dev->dev.bus_id;
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const u32 *reg;
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u64 addr;
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long magic;
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/*
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* If it's a DCR based device, use 'd' for native DCRs
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* and 'D' for MMIO DCRs.
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*/
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#ifdef CONFIG_PPC_DCR
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reg = get_property(node, "dcr-reg", NULL);
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if (reg) {
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#ifdef CONFIG_PPC_DCR_NATIVE
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snprintf(name, BUS_ID_SIZE, "d%x.%s",
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*reg, node->name);
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#else /* CONFIG_PPC_DCR_NATIVE */
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addr = of_translate_dcr_address(node, *reg, NULL);
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if (addr != OF_BAD_ADDR) {
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snprintf(name, BUS_ID_SIZE,
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"D%llx.%s", (unsigned long long)addr,
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node->name);
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return;
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}
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#endif /* !CONFIG_PPC_DCR_NATIVE */
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}
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#endif /* CONFIG_PPC_DCR */
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/*
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* For MMIO, get the physical address
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*/
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reg = get_property(node, "reg", NULL);
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if (reg) {
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addr = of_translate_address(node, reg);
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if (addr != OF_BAD_ADDR) {
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snprintf(name, BUS_ID_SIZE,
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"%llx.%s", (unsigned long long)addr,
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node->name);
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return;
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}
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}
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/*
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* No BusID, use the node name and add a globally incremented
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* counter (and pray...)
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*/
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magic = atomic_add_return(1, &bus_no_reg_magic);
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snprintf(name, BUS_ID_SIZE, "%s.%d", node->name, magic - 1);
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}
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struct of_device* of_platform_device_create(struct device_node *np,
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const char *bus_id,
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struct device *parent)
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{
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struct of_device *dev;
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dev = kmalloc(sizeof(*dev), GFP_KERNEL);
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if (!dev)
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return NULL;
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memset(dev, 0, sizeof(*dev));
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dev->node = of_node_get(np);
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dev->dma_mask = 0xffffffffUL;
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dev->dev.dma_mask = &dev->dma_mask;
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dev->dev.parent = parent;
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dev->dev.bus = &of_platform_bus_type;
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dev->dev.release = of_release_dev;
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dev->dev.archdata.of_node = np;
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dev->dev.archdata.numa_node = of_node_to_nid(np);
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/* We do not fill the DMA ops for platform devices by default.
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* This is currently the responsibility of the platform code
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* to do such, possibly using a device notifier
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*/
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if (bus_id)
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strlcpy(dev->dev.bus_id, bus_id, BUS_ID_SIZE);
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else
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of_platform_make_bus_id(dev);
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if (of_device_register(dev) != 0) {
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kfree(dev);
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return NULL;
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}
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return dev;
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}
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EXPORT_SYMBOL(of_platform_device_create);
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/**
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* of_platform_bus_create - Create an OF device for a bus node and all its
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* children. Optionally recursively instanciate matching busses.
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* @bus: device node of the bus to instanciate
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* @matches: match table, NULL to use the default, OF_NO_DEEP_PROBE to
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* disallow recursive creation of child busses
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*/
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static int of_platform_bus_create(struct device_node *bus,
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struct of_device_id *matches,
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struct device *parent)
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{
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struct device_node *child;
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struct of_device *dev;
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int rc = 0;
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for (child = NULL; (child = of_get_next_child(bus, child)); ) {
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pr_debug(" create child: %s\n", child->full_name);
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dev = of_platform_device_create(child, NULL, parent);
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if (dev == NULL)
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rc = -ENOMEM;
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else if (!of_match_node(matches, child))
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continue;
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if (rc == 0) {
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pr_debug(" and sub busses\n");
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rc = of_platform_bus_create(child, matches, &dev->dev);
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} if (rc) {
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of_node_put(child);
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break;
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}
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}
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return rc;
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}
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/**
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* of_platform_bus_probe - Probe the device-tree for platform busses
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* @root: parent of the first level to probe or NULL for the root of the tree
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* @matches: match table, NULL to use the default
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* @parent: parent to hook devices from, NULL for toplevel
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*
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* Note that children of the provided root are not instanciated as devices
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* unless the specified root itself matches the bus list and is not NULL.
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*/
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int of_platform_bus_probe(struct device_node *root,
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struct of_device_id *matches,
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struct device *parent)
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{
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struct device_node *child;
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struct of_device *dev;
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int rc = 0;
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if (matches == NULL)
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matches = of_default_bus_ids;
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if (matches == OF_NO_DEEP_PROBE)
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return -EINVAL;
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if (root == NULL)
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root = of_find_node_by_path("/");
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else
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of_node_get(root);
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pr_debug("of_platform_bus_probe()\n");
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pr_debug(" starting at: %s\n", root->full_name);
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/* Do a self check of bus type, if there's a match, create
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* children
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*/
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if (of_match_node(matches, root)) {
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pr_debug(" root match, create all sub devices\n");
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dev = of_platform_device_create(root, NULL, parent);
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if (dev == NULL) {
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rc = -ENOMEM;
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goto bail;
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}
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pr_debug(" create all sub busses\n");
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rc = of_platform_bus_create(root, matches, &dev->dev);
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goto bail;
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}
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for (child = NULL; (child = of_get_next_child(root, child)); ) {
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if (!of_match_node(matches, child))
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continue;
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pr_debug(" match: %s\n", child->full_name);
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dev = of_platform_device_create(child, NULL, parent);
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if (dev == NULL)
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rc = -ENOMEM;
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else
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rc = of_platform_bus_create(child, matches, &dev->dev);
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if (rc) {
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of_node_put(child);
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break;
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}
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}
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bail:
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of_node_put(root);
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return rc;
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}
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EXPORT_SYMBOL(of_platform_bus_probe);
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static int of_dev_node_match(struct device *dev, void *data)
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{
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return to_of_device(dev)->node == data;
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}
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struct of_device *of_find_device_by_node(struct device_node *np)
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{
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struct device *dev;
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dev = bus_find_device(&of_platform_bus_type,
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NULL, np, of_dev_node_match);
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if (dev)
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return to_of_device(dev);
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return NULL;
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}
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EXPORT_SYMBOL(of_find_device_by_node);
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static int of_dev_phandle_match(struct device *dev, void *data)
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{
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phandle *ph = data;
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return to_of_device(dev)->node->linux_phandle == *ph;
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}
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struct of_device *of_find_device_by_phandle(phandle ph)
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{
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struct device *dev;
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dev = bus_find_device(&of_platform_bus_type,
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NULL, &ph, of_dev_phandle_match);
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if (dev)
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return to_of_device(dev);
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return NULL;
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}
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EXPORT_SYMBOL(of_find_device_by_phandle);
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#ifdef CONFIG_PPC_OF_PLATFORM_PCI
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/* The probing of PCI controllers from of_platform is currently
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* 64 bits only, mostly due to gratuitous differences between
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* the 32 and 64 bits PCI code on PowerPC and the 32 bits one
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* lacking some bits needed here.
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*/
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static int __devinit of_pci_phb_probe(struct of_device *dev,
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const struct of_device_id *match)
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{
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struct pci_controller *phb;
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/* Check if we can do that ... */
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if (ppc_md.pci_setup_phb == NULL)
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return -ENODEV;
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printk(KERN_INFO "Setting up PCI bus %s\n", dev->node->full_name);
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/* Alloc and setup PHB data structure */
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phb = pcibios_alloc_controller(dev->node);
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if (!phb)
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return -ENODEV;
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/* Setup parent in sysfs */
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phb->parent = &dev->dev;
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/* Setup the PHB using arch provided callback */
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if (ppc_md.pci_setup_phb(phb)) {
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pcibios_free_controller(phb);
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return -ENODEV;
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}
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/* Process "ranges" property */
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pci_process_bridge_OF_ranges(phb, dev->node, 0);
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/* Setup IO space.
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* This will not work properly for ISA IOs, something needs to be done
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* about it if we ever generalize that way of probing PCI brigdes
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*/
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pci_setup_phb_io_dynamic(phb, 0);
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/* Init pci_dn data structures */
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pci_devs_phb_init_dynamic(phb);
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/* Register devices with EEH */
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#ifdef CONFIG_EEH
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if (dev->node->child)
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eeh_add_device_tree_early(dev->node);
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#endif /* CONFIG_EEH */
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/* Scan the bus */
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scan_phb(phb);
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/* Claim resources. This might need some rework as well depending
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* wether we are doing probe-only or not, like assigning unassigned
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* resources etc...
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*/
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pcibios_claim_one_bus(phb->bus);
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/* Finish EEH setup */
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#ifdef CONFIG_EEH
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eeh_add_device_tree_late(phb->bus);
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#endif
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/* Add probed PCI devices to the device model */
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pci_bus_add_devices(phb->bus);
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return 0;
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}
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static struct of_device_id of_pci_phb_ids[] = {
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{ .type = "pci", },
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{ .type = "pcix", },
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{ .type = "pcie", },
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{ .type = "pciex", },
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{ .type = "ht", },
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{}
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};
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static struct of_platform_driver of_pci_phb_driver = {
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.name = "of-pci",
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.match_table = of_pci_phb_ids,
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.probe = of_pci_phb_probe,
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.driver = {
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.multithread_probe = 1,
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},
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};
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static __init int of_pci_phb_init(void)
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{
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return of_register_platform_driver(&of_pci_phb_driver);
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}
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device_initcall(of_pci_phb_init);
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#endif /* CONFIG_PPC_OF_PLATFORM_PCI */
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