2 * Copyright (C) 2006 PA Semi, Inc
4 * Authors: Kip Walker, PA Semi
5 * Olof Johansson, PA Semi
7 * Maintained by: Olof Johansson <olof@lixom.net>
9 * Based on arch/powerpc/platforms/maple/pci.c
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26 #include <linux/kernel.h>
27 #include <linux/pci.h>
29 #include <asm/pci-bridge.h>
30 #include <asm/machdep.h>
32 #include <asm/ppc-pci.h>
34 #define PA_PXP_CFA(bus, devfn, off) (((bus) << 20) | ((devfn) << 12) | (off))
36 static inline int pa_pxp_offset_valid(u8 bus, u8 devfn, int offset)
38 /* Device 0 Function 0 is special: It's config space spans function 1 as
39 * well, so allow larger offset. It's really a two-function device but the
40 * second function does not probe.
42 if (bus == 0 && devfn == 0)
48 static void volatile __iomem *pa_pxp_cfg_addr(struct pci_controller *hose,
49 u8 bus, u8 devfn, int offset)
51 return hose->cfg_data + PA_PXP_CFA(bus, devfn, offset);
54 static int pa_pxp_read_config(struct pci_bus *bus, unsigned int devfn,
55 int offset, int len, u32 *val)
57 struct pci_controller *hose;
58 void volatile __iomem *addr;
60 hose = pci_bus_to_host(bus);
62 return PCIBIOS_DEVICE_NOT_FOUND;
64 if (!pa_pxp_offset_valid(bus->number, devfn, offset))
65 return PCIBIOS_BAD_REGISTER_NUMBER;
67 addr = pa_pxp_cfg_addr(hose, bus->number, devfn, offset);
70 * Note: the caller has already checked that offset is
71 * suitably aligned and that len is 1, 2 or 4.
85 return PCIBIOS_SUCCESSFUL;
88 static int pa_pxp_write_config(struct pci_bus *bus, unsigned int devfn,
89 int offset, int len, u32 val)
91 struct pci_controller *hose;
92 void volatile __iomem *addr;
94 hose = pci_bus_to_host(bus);
96 return PCIBIOS_DEVICE_NOT_FOUND;
98 if (!pa_pxp_offset_valid(bus->number, devfn, offset))
99 return PCIBIOS_BAD_REGISTER_NUMBER;
101 addr = pa_pxp_cfg_addr(hose, bus->number, devfn, offset);
104 * Note: the caller has already checked that offset is
105 * suitably aligned and that len is 1, 2 or 4.
118 return PCIBIOS_SUCCESSFUL;
121 static struct pci_ops pa_pxp_ops = {
122 .read = pa_pxp_read_config,
123 .write = pa_pxp_write_config,
126 static void __init setup_pa_pxp(struct pci_controller *hose)
128 hose->ops = &pa_pxp_ops;
129 hose->cfg_data = ioremap(0xe0000000, 0x10000000);
132 static int __init pas_add_bridge(struct device_node *dev)
134 struct pci_controller *hose;
136 pr_debug("Adding PCI host bridge %s\n", dev->full_name);
138 hose = pcibios_alloc_controller(dev);
142 hose->first_busno = 0;
143 hose->last_busno = 0xff;
147 printk(KERN_INFO "Found PA-PXP PCI host bridge.\n");
149 /* Interpret the "ranges" property */
150 pci_process_bridge_OF_ranges(hose, dev, 1);
155 void __init pas_pci_init(void)
157 struct device_node *np, *root;
159 root = of_find_node_by_path("/");
161 printk(KERN_CRIT "pas_pci_init: can't find root "
166 for (np = NULL; (np = of_get_next_child(root, np)) != NULL;)
167 if (np->name && !strcmp(np->name, "pxp") && !pas_add_bridge(np))
172 /* Setup the linkage between OF nodes and PHBs */
175 /* Use the common resource allocation mechanism */