2 * arch/mips/pci/ops-emma2rh.c
3 * This file defines the PCI operation for EMMA2RH.
5 * Copyright (C) NEC Electronics Corporation 2004-2006
7 * This file is based on the arch/mips/pci/ops-vr41xx.c
9 * Copyright 2001 MontaVista Software Inc.
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26 #include <linux/pci.h>
27 #include <linux/kernel.h>
28 #include <linux/types.h>
30 #include <asm/addrspace.h>
31 #include <asm/debug.h>
33 #include <asm/emma2rh/emma2rh.h>
35 #define RTABORT (0x1<<9)
36 #define RMABORT (0x1<<10)
37 #define EMMA2RH_PCI_SLOT_NUM 9 /* 0000:09.0 is final PCI device */
43 static int check_args(struct pci_bus *bus, u32 devfn, u32 * bus_num)
45 /* check if the bus is top-level */
46 if (bus->parent != NULL) {
47 *bus_num = bus->number;
48 db_assert(bus_num != 0);
54 if (PCI_SLOT(devfn) >= 10)
55 return PCIBIOS_DEVICE_NOT_FOUND;
58 if ((*bus_num >= 64) || (PCI_SLOT(devfn) >= 16))
59 return PCIBIOS_DEVICE_NOT_FOUND;
64 static inline int set_pci_configuration_address(unsigned char bus_num,
65 unsigned int devfn, int where)
69 emma2rh_out32(EMMA2RH_PCI_INT, ~RMABORT);
72 * Type 0 configuration
74 config_win0 = (1 << (22 + PCI_SLOT(devfn))) | (5 << 9);
77 * Type 1 configuration
79 config_win0 = (bus_num << 26) | (PCI_SLOT(devfn) << 22) |
82 emma2rh_out32(EMMA2RH_PCI_IWIN0_CTR, config_win0);
87 static int pci_config_read(struct pci_bus *bus, unsigned int devfn, int where,
88 int size, uint32_t * val)
91 u32 base = KSEG1ADDR(EMMA2RH_PCI_CONFIG_BASE);
97 if (check_args(bus, devfn, &bus_num) == PCIBIOS_DEVICE_NOT_FOUND)
98 return PCIBIOS_DEVICE_NOT_FOUND;
100 backup_win0 = emma2rh_in32(EMMA2RH_PCI_IWIN0_CTR);
102 if (set_pci_configuration_address(bus_num, devfn, where) < 0)
103 return PCIBIOS_DEVICE_NOT_FOUND;
106 *(volatile u32 *)(base + (PCI_FUNC(devfn) << 8) +
107 (where & 0xfffffffc));
111 *val = (data >> ((where & 3) << 3)) & 0xffU;
114 *val = (data >> ((where & 2) << 3)) & 0xffffU;
120 emma2rh_out32(EMMA2RH_PCI_IWIN0_CTR, backup_win0);
121 return PCIBIOS_FUNC_NOT_SUPPORTED;
124 emma2rh_out32(EMMA2RH_PCI_IWIN0_CTR, backup_win0);
126 if (emma2rh_in32(EMMA2RH_PCI_INT) & RMABORT)
127 return PCIBIOS_DEVICE_NOT_FOUND;
129 return PCIBIOS_SUCCESSFUL;
132 static int pci_config_write(struct pci_bus *bus, unsigned int devfn, int where,
136 u32 base = KSEG1ADDR(EMMA2RH_PCI_CONFIG_BASE);
141 if (check_args(bus, devfn, &bus_num) == PCIBIOS_DEVICE_NOT_FOUND)
142 return PCIBIOS_DEVICE_NOT_FOUND;
144 backup_win0 = emma2rh_in32(EMMA2RH_PCI_IWIN0_CTR);
146 if (set_pci_configuration_address(bus_num, devfn, where) < 0)
147 return PCIBIOS_DEVICE_NOT_FOUND;
149 /* read modify write */
151 *(volatile u32 *)(base + (PCI_FUNC(devfn) << 8) +
152 (where & 0xfffffffc));
156 shift = (where & 3) << 3;
157 data &= ~(0xffU << shift);
158 data |= ((val & 0xffU) << shift);
161 shift = (where & 2) << 3;
162 data &= ~(0xffffU << shift);
163 data |= ((val & 0xffffU) << shift);
169 emma2rh_out32(EMMA2RH_PCI_IWIN0_CTR, backup_win0);
170 return PCIBIOS_FUNC_NOT_SUPPORTED;
172 *(volatile u32 *)(base + (PCI_FUNC(devfn) << 8) +
173 (where & 0xfffffffc)) = data;
175 emma2rh_out32(EMMA2RH_PCI_IWIN0_CTR, backup_win0);
176 if (emma2rh_in32(EMMA2RH_PCI_INT) & RMABORT)
177 return PCIBIOS_DEVICE_NOT_FOUND;
179 return PCIBIOS_SUCCESSFUL;
182 struct pci_ops emma2rh_pci_ops = {
183 .read = pci_config_read,
184 .write = pci_config_write,