| /* |
| * Copyright (C) 2006 PA Semi, Inc |
| * |
| * Authors: Kip Walker, PA Semi |
| * Olof Johansson, PA Semi |
| * |
| * Maintained by: Olof Johansson <olof@lixom.net> |
| * |
| * Based on arch/powerpc/platforms/maple/pci.c |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| |
| |
| #include <linux/kernel.h> |
| #include <linux/pci.h> |
| |
| #include <asm/pci-bridge.h> |
| #include <asm/machdep.h> |
| |
| #include <asm/ppc-pci.h> |
| |
| #define PA_PXP_CFA(bus, devfn, off) (((bus) << 20) | ((devfn) << 12) | (off)) |
| |
| static inline int pa_pxp_offset_valid(u8 bus, u8 devfn, int offset) |
| { |
| /* Device 0 Function 0 is special: It's config space spans function 1 as |
| * well, so allow larger offset. It's really a two-function device but the |
| * second function does not probe. |
| */ |
| if (bus == 0 && devfn == 0) |
| return offset < 8192; |
| else |
| return offset < 4096; |
| } |
| |
| static void volatile __iomem *pa_pxp_cfg_addr(struct pci_controller *hose, |
| u8 bus, u8 devfn, int offset) |
| { |
| return hose->cfg_data + PA_PXP_CFA(bus, devfn, offset); |
| } |
| |
| static int pa_pxp_read_config(struct pci_bus *bus, unsigned int devfn, |
| int offset, int len, u32 *val) |
| { |
| struct pci_controller *hose; |
| void volatile __iomem *addr; |
| |
| hose = pci_bus_to_host(bus); |
| if (!hose) |
| return PCIBIOS_DEVICE_NOT_FOUND; |
| |
| if (!pa_pxp_offset_valid(bus->number, devfn, offset)) |
| return PCIBIOS_BAD_REGISTER_NUMBER; |
| |
| addr = pa_pxp_cfg_addr(hose, bus->number, devfn, offset); |
| |
| /* |
| * Note: the caller has already checked that offset is |
| * suitably aligned and that len is 1, 2 or 4. |
| */ |
| switch (len) { |
| case 1: |
| *val = in_8(addr); |
| break; |
| case 2: |
| *val = in_le16(addr); |
| break; |
| default: |
| *val = in_le32(addr); |
| break; |
| } |
| |
| return PCIBIOS_SUCCESSFUL; |
| } |
| |
| static int pa_pxp_write_config(struct pci_bus *bus, unsigned int devfn, |
| int offset, int len, u32 val) |
| { |
| struct pci_controller *hose; |
| void volatile __iomem *addr; |
| |
| hose = pci_bus_to_host(bus); |
| if (!hose) |
| return PCIBIOS_DEVICE_NOT_FOUND; |
| |
| if (!pa_pxp_offset_valid(bus->number, devfn, offset)) |
| return PCIBIOS_BAD_REGISTER_NUMBER; |
| |
| addr = pa_pxp_cfg_addr(hose, bus->number, devfn, offset); |
| |
| /* |
| * Note: the caller has already checked that offset is |
| * suitably aligned and that len is 1, 2 or 4. |
| */ |
| switch (len) { |
| case 1: |
| out_8(addr, val); |
| (void) in_8(addr); |
| break; |
| case 2: |
| out_le16(addr, val); |
| (void) in_le16(addr); |
| break; |
| default: |
| out_le32(addr, val); |
| (void) in_le32(addr); |
| break; |
| } |
| return PCIBIOS_SUCCESSFUL; |
| } |
| |
| static struct pci_ops pa_pxp_ops = { |
| pa_pxp_read_config, |
| pa_pxp_write_config, |
| }; |
| |
| static void __init setup_pa_pxp(struct pci_controller *hose) |
| { |
| hose->ops = &pa_pxp_ops; |
| hose->cfg_data = ioremap(0xe0000000, 0x10000000); |
| } |
| |
| static int __init pas_add_bridge(struct device_node *dev) |
| { |
| struct pci_controller *hose; |
| |
| pr_debug("Adding PCI host bridge %s\n", dev->full_name); |
| |
| hose = pcibios_alloc_controller(dev); |
| if (!hose) |
| return -ENOMEM; |
| |
| hose->first_busno = 0; |
| hose->last_busno = 0xff; |
| |
| setup_pa_pxp(hose); |
| |
| printk(KERN_INFO "Found PA-PXP PCI host bridge.\n"); |
| |
| /* Interpret the "ranges" property */ |
| pci_process_bridge_OF_ranges(hose, dev, 1); |
| |
| return 0; |
| } |
| |
| void __init pas_pci_init(void) |
| { |
| struct device_node *np, *root; |
| |
| root = of_find_node_by_path("/"); |
| if (!root) { |
| printk(KERN_CRIT "pas_pci_init: can't find root " |
| "of device tree\n"); |
| return; |
| } |
| |
| for (np = NULL; (np = of_get_next_child(root, np)) != NULL;) |
| if (np->name && !strcmp(np->name, "pxp") && !pas_add_bridge(np)) |
| of_node_get(np); |
| |
| of_node_put(root); |
| |
| /* Setup the linkage between OF nodes and PHBs */ |
| pci_devs_phb_init(); |
| |
| /* Use the common resource allocation mechanism */ |
| pci_probe_only = 1; |
| } |