282045b450
Fixed the following warnings: WARNING: vmlinux.o(.text+0x2934): Section mismatch: reference to .init.text:__alloc_bootmem (between 'irq_alloc_host' and 'irq_set_default_host') WARNING: vmlinux.o(.text+0xb2aa): Section mismatch: reference to .init.data:boot_command_line (between 'register_early_udbg_console' and 'udbg_printf') WARNING: vmlinux.o(.text+0xb2b2): Section mismatch: reference to .init.data:boot_command_line (between 'register_early_udbg_console' and 'udbg_printf') WARNING: vmlinux.o(.text+0xe354): Section mismatch: reference to .init.text:__alloc_bootmem (between 'pcibios_alloc_controller' and 'pci_domain_nr') WARNING: vmlinux.o(.text+0x12768): Section mismatch: reference to .init.text:update_bridge_resource (between 'quirk_fsl_pcie_transparent' and 'indirect_read_config') WARNING: vmlinux.o(.text+0x127a8): Section mismatch: reference to .init.text:update_bridge_resource (between 'quirk_fsl_pcie_transparent' and 'indirect_read_config') WARNING: vmlinux.o(.text+0x17566c): Section mismatch: reference to .init.text:pcibios_fixup_bus (between 'pci_scan_child_bus' and 'pci_scan_bus_parented') Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
458 lines
12 KiB
C
458 lines
12 KiB
C
/*
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* Contains common pci routines for ALL ppc platform
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* (based on pci_32.c and pci_64.c)
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*
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* Port for PPC64 David Engebretsen, IBM Corp.
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* Contains common pci routines for ppc64 platform, pSeries and iSeries brands.
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*
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* Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM
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* Rework, based on alpha PCI code.
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*
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* Common pmac/prep/chrp pci routines. -- Cort
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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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#undef DEBUG
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#include <linux/kernel.h>
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#include <linux/pci.h>
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#include <linux/string.h>
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#include <linux/init.h>
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#include <linux/bootmem.h>
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#include <linux/mm.h>
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#include <linux/list.h>
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#include <linux/syscalls.h>
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#include <linux/irq.h>
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#include <linux/vmalloc.h>
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#include <asm/processor.h>
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#include <asm/io.h>
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#include <asm/prom.h>
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#include <asm/pci-bridge.h>
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#include <asm/byteorder.h>
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#include <asm/machdep.h>
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#include <asm/ppc-pci.h>
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#include <asm/firmware.h>
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#ifdef DEBUG
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#include <asm/udbg.h>
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#define DBG(fmt...) printk(fmt)
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#else
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#define DBG(fmt...)
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#endif
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static DEFINE_SPINLOCK(hose_spinlock);
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/* XXX kill that some day ... */
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int global_phb_number; /* Global phb counter */
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extern struct list_head hose_list;
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/*
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* pci_controller(phb) initialized common variables.
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*/
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static void __devinit pci_setup_pci_controller(struct pci_controller *hose)
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{
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memset(hose, 0, sizeof(struct pci_controller));
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spin_lock(&hose_spinlock);
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hose->global_number = global_phb_number++;
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list_add_tail(&hose->list_node, &hose_list);
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spin_unlock(&hose_spinlock);
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}
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__init_refok struct pci_controller * pcibios_alloc_controller(struct device_node *dev)
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{
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struct pci_controller *phb;
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if (mem_init_done)
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phb = kmalloc(sizeof(struct pci_controller), GFP_KERNEL);
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else
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phb = alloc_bootmem(sizeof (struct pci_controller));
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if (phb == NULL)
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return NULL;
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pci_setup_pci_controller(phb);
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phb->arch_data = dev;
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phb->is_dynamic = mem_init_done;
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#ifdef CONFIG_PPC64
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if (dev) {
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int nid = of_node_to_nid(dev);
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if (nid < 0 || !node_online(nid))
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nid = -1;
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PHB_SET_NODE(phb, nid);
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}
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#endif
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return phb;
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}
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void pcibios_free_controller(struct pci_controller *phb)
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{
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spin_lock(&hose_spinlock);
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list_del(&phb->list_node);
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spin_unlock(&hose_spinlock);
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if (phb->is_dynamic)
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kfree(phb);
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}
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/*
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* Return the domain number for this bus.
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*/
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int pci_domain_nr(struct pci_bus *bus)
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{
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if (firmware_has_feature(FW_FEATURE_ISERIES))
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return 0;
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else {
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struct pci_controller *hose = pci_bus_to_host(bus);
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return hose->global_number;
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}
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}
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EXPORT_SYMBOL(pci_domain_nr);
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#ifdef CONFIG_PPC_OF
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/* This routine is meant to be used early during boot, when the
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* PCI bus numbers have not yet been assigned, and you need to
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* issue PCI config cycles to an OF device.
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* It could also be used to "fix" RTAS config cycles if you want
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* to set pci_assign_all_buses to 1 and still use RTAS for PCI
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* config cycles.
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*/
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struct pci_controller* pci_find_hose_for_OF_device(struct device_node* node)
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{
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if (!have_of)
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return NULL;
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while(node) {
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struct pci_controller *hose, *tmp;
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list_for_each_entry_safe(hose, tmp, &hose_list, list_node)
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if (hose->arch_data == node)
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return hose;
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node = node->parent;
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}
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return NULL;
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}
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static ssize_t pci_show_devspec(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct pci_dev *pdev;
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struct device_node *np;
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pdev = to_pci_dev (dev);
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np = pci_device_to_OF_node(pdev);
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if (np == NULL || np->full_name == NULL)
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return 0;
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return sprintf(buf, "%s", np->full_name);
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}
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static DEVICE_ATTR(devspec, S_IRUGO, pci_show_devspec, NULL);
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#endif /* CONFIG_PPC_OF */
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/* Add sysfs properties */
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int pcibios_add_platform_entries(struct pci_dev *pdev)
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{
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#ifdef CONFIG_PPC_OF
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return device_create_file(&pdev->dev, &dev_attr_devspec);
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#else
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return 0;
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#endif /* CONFIG_PPC_OF */
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}
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char __devinit *pcibios_setup(char *str)
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{
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return str;
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}
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/*
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* Reads the interrupt pin to determine if interrupt is use by card.
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* If the interrupt is used, then gets the interrupt line from the
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* openfirmware and sets it in the pci_dev and pci_config line.
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*/
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int pci_read_irq_line(struct pci_dev *pci_dev)
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{
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struct of_irq oirq;
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unsigned int virq;
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DBG("Try to map irq for %s...\n", pci_name(pci_dev));
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#ifdef DEBUG
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memset(&oirq, 0xff, sizeof(oirq));
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#endif
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/* Try to get a mapping from the device-tree */
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if (of_irq_map_pci(pci_dev, &oirq)) {
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u8 line, pin;
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/* If that fails, lets fallback to what is in the config
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* space and map that through the default controller. We
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* also set the type to level low since that's what PCI
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* interrupts are. If your platform does differently, then
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* either provide a proper interrupt tree or don't use this
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* function.
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*/
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if (pci_read_config_byte(pci_dev, PCI_INTERRUPT_PIN, &pin))
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return -1;
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if (pin == 0)
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return -1;
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if (pci_read_config_byte(pci_dev, PCI_INTERRUPT_LINE, &line) ||
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line == 0xff) {
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return -1;
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}
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DBG(" -> no map ! Using irq line %d from PCI config\n", line);
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virq = irq_create_mapping(NULL, line);
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if (virq != NO_IRQ)
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set_irq_type(virq, IRQ_TYPE_LEVEL_LOW);
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} else {
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DBG(" -> got one, spec %d cells (0x%08x 0x%08x...) on %s\n",
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oirq.size, oirq.specifier[0], oirq.specifier[1],
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oirq.controller->full_name);
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virq = irq_create_of_mapping(oirq.controller, oirq.specifier,
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oirq.size);
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}
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if(virq == NO_IRQ) {
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DBG(" -> failed to map !\n");
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return -1;
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}
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DBG(" -> mapped to linux irq %d\n", virq);
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pci_dev->irq = virq;
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return 0;
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}
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EXPORT_SYMBOL(pci_read_irq_line);
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/*
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* Platform support for /proc/bus/pci/X/Y mmap()s,
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* modelled on the sparc64 implementation by Dave Miller.
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* -- paulus.
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*/
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/*
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* Adjust vm_pgoff of VMA such that it is the physical page offset
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* corresponding to the 32-bit pci bus offset for DEV requested by the user.
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*
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* Basically, the user finds the base address for his device which he wishes
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* to mmap. They read the 32-bit value from the config space base register,
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* add whatever PAGE_SIZE multiple offset they wish, and feed this into the
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* offset parameter of mmap on /proc/bus/pci/XXX for that device.
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*
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* Returns negative error code on failure, zero on success.
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*/
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static struct resource *__pci_mmap_make_offset(struct pci_dev *dev,
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resource_size_t *offset,
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enum pci_mmap_state mmap_state)
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{
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struct pci_controller *hose = pci_bus_to_host(dev->bus);
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unsigned long io_offset = 0;
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int i, res_bit;
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if (hose == 0)
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return NULL; /* should never happen */
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/* If memory, add on the PCI bridge address offset */
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if (mmap_state == pci_mmap_mem) {
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#if 0 /* See comment in pci_resource_to_user() for why this is disabled */
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*offset += hose->pci_mem_offset;
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#endif
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res_bit = IORESOURCE_MEM;
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} else {
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io_offset = (unsigned long)hose->io_base_virt - _IO_BASE;
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*offset += io_offset;
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res_bit = IORESOURCE_IO;
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}
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/*
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* Check that the offset requested corresponds to one of the
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* resources of the device.
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*/
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for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
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struct resource *rp = &dev->resource[i];
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int flags = rp->flags;
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/* treat ROM as memory (should be already) */
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if (i == PCI_ROM_RESOURCE)
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flags |= IORESOURCE_MEM;
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/* Active and same type? */
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if ((flags & res_bit) == 0)
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continue;
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/* In the range of this resource? */
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if (*offset < (rp->start & PAGE_MASK) || *offset > rp->end)
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continue;
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/* found it! construct the final physical address */
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if (mmap_state == pci_mmap_io)
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*offset += hose->io_base_phys - io_offset;
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return rp;
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}
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return NULL;
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}
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/*
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* Set vm_page_prot of VMA, as appropriate for this architecture, for a pci
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* device mapping.
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*/
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static pgprot_t __pci_mmap_set_pgprot(struct pci_dev *dev, struct resource *rp,
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pgprot_t protection,
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enum pci_mmap_state mmap_state,
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int write_combine)
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{
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unsigned long prot = pgprot_val(protection);
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/* Write combine is always 0 on non-memory space mappings. On
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* memory space, if the user didn't pass 1, we check for a
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* "prefetchable" resource. This is a bit hackish, but we use
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* this to workaround the inability of /sysfs to provide a write
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* combine bit
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*/
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if (mmap_state != pci_mmap_mem)
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write_combine = 0;
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else if (write_combine == 0) {
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if (rp->flags & IORESOURCE_PREFETCH)
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write_combine = 1;
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}
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/* XXX would be nice to have a way to ask for write-through */
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prot |= _PAGE_NO_CACHE;
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if (write_combine)
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prot &= ~_PAGE_GUARDED;
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else
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prot |= _PAGE_GUARDED;
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return __pgprot(prot);
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}
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/*
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* This one is used by /dev/mem and fbdev who have no clue about the
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* PCI device, it tries to find the PCI device first and calls the
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* above routine
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*/
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pgprot_t pci_phys_mem_access_prot(struct file *file,
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unsigned long pfn,
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unsigned long size,
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pgprot_t protection)
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{
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struct pci_dev *pdev = NULL;
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struct resource *found = NULL;
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unsigned long prot = pgprot_val(protection);
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unsigned long offset = pfn << PAGE_SHIFT;
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int i;
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if (page_is_ram(pfn))
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return __pgprot(prot);
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prot |= _PAGE_NO_CACHE | _PAGE_GUARDED;
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for_each_pci_dev(pdev) {
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for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
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struct resource *rp = &pdev->resource[i];
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int flags = rp->flags;
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/* Active and same type? */
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if ((flags & IORESOURCE_MEM) == 0)
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continue;
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/* In the range of this resource? */
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if (offset < (rp->start & PAGE_MASK) ||
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offset > rp->end)
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continue;
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found = rp;
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break;
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}
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if (found)
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break;
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}
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if (found) {
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if (found->flags & IORESOURCE_PREFETCH)
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prot &= ~_PAGE_GUARDED;
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pci_dev_put(pdev);
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}
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DBG("non-PCI map for %lx, prot: %lx\n", offset, prot);
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return __pgprot(prot);
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}
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/*
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* Perform the actual remap of the pages for a PCI device mapping, as
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* appropriate for this architecture. The region in the process to map
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* is described by vm_start and vm_end members of VMA, the base physical
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* address is found in vm_pgoff.
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* The pci device structure is provided so that architectures may make mapping
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* decisions on a per-device or per-bus basis.
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*
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* Returns a negative error code on failure, zero on success.
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*/
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int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
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enum pci_mmap_state mmap_state, int write_combine)
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{
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resource_size_t offset = vma->vm_pgoff << PAGE_SHIFT;
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struct resource *rp;
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int ret;
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rp = __pci_mmap_make_offset(dev, &offset, mmap_state);
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if (rp == NULL)
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return -EINVAL;
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vma->vm_pgoff = offset >> PAGE_SHIFT;
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vma->vm_page_prot = __pci_mmap_set_pgprot(dev, rp,
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vma->vm_page_prot,
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mmap_state, write_combine);
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ret = remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
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vma->vm_end - vma->vm_start, vma->vm_page_prot);
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return ret;
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}
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void pci_resource_to_user(const struct pci_dev *dev, int bar,
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const struct resource *rsrc,
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resource_size_t *start, resource_size_t *end)
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{
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struct pci_controller *hose = pci_bus_to_host(dev->bus);
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resource_size_t offset = 0;
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if (hose == NULL)
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return;
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if (rsrc->flags & IORESOURCE_IO)
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offset = (unsigned long)hose->io_base_virt - _IO_BASE;
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/* We pass a fully fixed up address to userland for MMIO instead of
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* a BAR value because X is lame and expects to be able to use that
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* to pass to /dev/mem !
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*
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* That means that we'll have potentially 64 bits values where some
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* userland apps only expect 32 (like X itself since it thinks only
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* Sparc has 64 bits MMIO) but if we don't do that, we break it on
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* 32 bits CHRPs :-(
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*
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* Hopefully, the sysfs insterface is immune to that gunk. Once X
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* has been fixed (and the fix spread enough), we can re-enable the
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* 2 lines below and pass down a BAR value to userland. In that case
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* we'll also have to re-enable the matching code in
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* __pci_mmap_make_offset().
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*
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* BenH.
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*/
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#if 0
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else if (rsrc->flags & IORESOURCE_MEM)
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offset = hose->pci_mem_offset;
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#endif
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*start = rsrc->start - offset;
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*end = rsrc->end - offset;
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}
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