![Arnd Bergmann](/assets/img/avatar_default.png)
We had a problem on a system with only dynamically allocated PCI buses (using of_pci_phb_driver) in combination with libata. This setup ended up having no "primary" phb, which means that pci_io_base never got initialized and all IO port numbers are 64 bit numbers, which is larger than the PIO_MASK limit. Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
490 lines
12 KiB
C
490 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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{ .type = "ebc", },
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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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.uevent = of_device_uevent,
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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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int 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 = of_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 = of_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. We use the non-dynamic version of that code here,
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* which doesn't quite support unplugging. Next kernel release will
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* have a better fix for this.
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* Note also that we don't do ISA, this will also be fixed with a
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* more massive rework.
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*/
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pci_setup_phb_io(phb, pci_io_base == 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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};
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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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