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203 lines
4.7 KiB
203 lines
4.7 KiB
/*
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* Copyright (C) 2006 PA Semi, Inc
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*
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* Authors: Kip Walker, PA Semi
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* Olof Johansson, PA Semi
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*
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* Maintained by: Olof Johansson <olof@lixom.net>
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*
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* Based on arch/powerpc/platforms/maple/pci.c
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/kernel.h>
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#include <linux/pci.h>
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#include <asm/pci-bridge.h>
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#include <asm/machdep.h>
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#include <asm/ppc-pci.h>
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#define PA_PXP_CFA(bus, devfn, off) (((bus) << 20) | ((devfn) << 12) | (off))
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#define CONFIG_OFFSET_VALID(off) ((off) < 4096)
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static void volatile __iomem *pa_pxp_cfg_addr(struct pci_controller *hose,
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u8 bus, u8 devfn, int offset)
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{
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return hose->cfg_data + PA_PXP_CFA(bus, devfn, offset);
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}
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static int pa_pxp_read_config(struct pci_bus *bus, unsigned int devfn,
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int offset, int len, u32 *val)
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{
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struct pci_controller *hose;
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void volatile __iomem *addr;
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hose = pci_bus_to_host(bus);
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if (!hose)
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return PCIBIOS_DEVICE_NOT_FOUND;
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if (!CONFIG_OFFSET_VALID(offset))
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return PCIBIOS_BAD_REGISTER_NUMBER;
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addr = pa_pxp_cfg_addr(hose, bus->number, devfn, offset);
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/*
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* Note: the caller has already checked that offset is
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* suitably aligned and that len is 1, 2 or 4.
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*/
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switch (len) {
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case 1:
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*val = in_8(addr);
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break;
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case 2:
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*val = in_le16(addr);
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break;
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default:
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*val = in_le32(addr);
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break;
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}
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return PCIBIOS_SUCCESSFUL;
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}
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static int pa_pxp_write_config(struct pci_bus *bus, unsigned int devfn,
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int offset, int len, u32 val)
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{
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struct pci_controller *hose;
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void volatile __iomem *addr;
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hose = pci_bus_to_host(bus);
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if (!hose)
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return PCIBIOS_DEVICE_NOT_FOUND;
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if (!CONFIG_OFFSET_VALID(offset))
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return PCIBIOS_BAD_REGISTER_NUMBER;
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addr = pa_pxp_cfg_addr(hose, bus->number, devfn, offset);
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/*
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* Note: the caller has already checked that offset is
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* suitably aligned and that len is 1, 2 or 4.
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*/
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switch (len) {
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case 1:
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out_8(addr, val);
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(void) in_8(addr);
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break;
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case 2:
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out_le16(addr, val);
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(void) in_le16(addr);
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break;
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default:
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out_le32(addr, val);
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(void) in_le32(addr);
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break;
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}
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return PCIBIOS_SUCCESSFUL;
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}
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static struct pci_ops pa_pxp_ops = {
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pa_pxp_read_config,
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pa_pxp_write_config,
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};
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static void __init setup_pa_pxp(struct pci_controller *hose)
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{
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hose->ops = &pa_pxp_ops;
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hose->cfg_data = ioremap(0xe0000000, 0x10000000);
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}
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static int __init add_bridge(struct device_node *dev)
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{
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struct pci_controller *hose;
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pr_debug("Adding PCI host bridge %s\n", dev->full_name);
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hose = pcibios_alloc_controller(dev);
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if (!hose)
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return -ENOMEM;
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hose->first_busno = 0;
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hose->last_busno = 0xff;
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setup_pa_pxp(hose);
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printk(KERN_INFO "Found PA-PXP PCI host bridge.\n");
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/* Interpret the "ranges" property */
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/* This also maps the I/O region and sets isa_io/mem_base */
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pci_process_bridge_OF_ranges(hose, dev, 1);
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pci_setup_phb_io(hose, 1);
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return 0;
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}
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static void __init pas_fixup_phb_resources(void)
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{
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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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unsigned long offset = (unsigned long)hose->io_base_virt - pci_io_base;
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hose->io_resource.start += offset;
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hose->io_resource.end += offset;
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printk(KERN_INFO "PCI Host %d, io start: %lx; io end: %lx\n",
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hose->global_number,
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hose->io_resource.start, hose->io_resource.end);
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}
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}
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void __devinit pas_pci_irq_fixup(struct pci_dev *dev)
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{
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/* DMA is special, 84 interrupts (128 -> 211), all but 128
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* need to be mapped by hand here.
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*/
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if (dev->vendor == 0x1959 && dev->device == 0xa007) {
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int i;
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for (i = 129; i < 212; i++)
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irq_create_mapping(NULL, i);
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}
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}
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void __init pas_pci_init(void)
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{
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struct device_node *np, *root;
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root = of_find_node_by_path("/");
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if (!root) {
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printk(KERN_CRIT "pas_pci_init: can't find root "
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"of device tree\n");
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return;
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}
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for (np = NULL; (np = of_get_next_child(root, np)) != NULL;)
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if (np->name && !strcmp(np->name, "pxp") && !add_bridge(np))
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of_node_get(np);
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of_node_put(root);
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pas_fixup_phb_resources();
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/* Setup the linkage between OF nodes and PHBs */
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pci_devs_phb_init();
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/* Use the common resource allocation mechanism */
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pci_probe_only = 1;
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}
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