2 * Copyright (C) NEC Electronics Corporation 2004-2006
4 * This file is based on the arch/mips/pci/ops-vr41xx.c
6 * Copyright 2001 MontaVista Software Inc.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 #include <linux/pci.h>
24 #include <linux/kernel.h>
25 #include <linux/types.h>
27 #include <asm/addrspace.h>
29 #include <asm/emma/emma2rh.h>
31 #define RTABORT (0x1<<9)
32 #define RMABORT (0x1<<10)
33 #define EMMA2RH_PCI_SLOT_NUM 9 /* 0000:09.0 is final PCI device */
39 static int check_args(struct pci_bus *bus, u32 devfn, u32 * bus_num)
41 /* check if the bus is top-level */
42 if (bus->parent != NULL)
43 *bus_num = bus->number;
49 if (PCI_SLOT(devfn) >= 10)
50 return PCIBIOS_DEVICE_NOT_FOUND;
53 if ((*bus_num >= 64) || (PCI_SLOT(devfn) >= 16))
54 return PCIBIOS_DEVICE_NOT_FOUND;
59 static inline int set_pci_configuration_address(unsigned char bus_num,
60 unsigned int devfn, int where)
64 emma2rh_out32(EMMA2RH_PCI_INT, ~RMABORT);
67 * Type 0 configuration
69 config_win0 = (1 << (22 + PCI_SLOT(devfn))) | (5 << 9);
72 * Type 1 configuration
74 config_win0 = (bus_num << 26) | (PCI_SLOT(devfn) << 22) |
77 emma2rh_out32(EMMA2RH_PCI_IWIN0_CTR, config_win0);
82 static int pci_config_read(struct pci_bus *bus, unsigned int devfn, int where,
83 int size, uint32_t * val)
86 u32 base = KSEG1ADDR(EMMA2RH_PCI_CONFIG_BASE);
92 if (check_args(bus, devfn, &bus_num) == PCIBIOS_DEVICE_NOT_FOUND)
93 return PCIBIOS_DEVICE_NOT_FOUND;
95 backup_win0 = emma2rh_in32(EMMA2RH_PCI_IWIN0_CTR);
97 if (set_pci_configuration_address(bus_num, devfn, where) < 0)
98 return PCIBIOS_DEVICE_NOT_FOUND;
101 *(volatile u32 *)(base + (PCI_FUNC(devfn) << 8) +
102 (where & 0xfffffffc));
106 *val = (data >> ((where & 3) << 3)) & 0xffU;
109 *val = (data >> ((where & 2) << 3)) & 0xffffU;
115 emma2rh_out32(EMMA2RH_PCI_IWIN0_CTR, backup_win0);
116 return PCIBIOS_FUNC_NOT_SUPPORTED;
119 emma2rh_out32(EMMA2RH_PCI_IWIN0_CTR, backup_win0);
121 if (emma2rh_in32(EMMA2RH_PCI_INT) & RMABORT)
122 return PCIBIOS_DEVICE_NOT_FOUND;
124 return PCIBIOS_SUCCESSFUL;
127 static int pci_config_write(struct pci_bus *bus, unsigned int devfn, int where,
131 u32 base = KSEG1ADDR(EMMA2RH_PCI_CONFIG_BASE);
136 if (check_args(bus, devfn, &bus_num) == PCIBIOS_DEVICE_NOT_FOUND)
137 return PCIBIOS_DEVICE_NOT_FOUND;
139 backup_win0 = emma2rh_in32(EMMA2RH_PCI_IWIN0_CTR);
141 if (set_pci_configuration_address(bus_num, devfn, where) < 0)
142 return PCIBIOS_DEVICE_NOT_FOUND;
144 /* read modify write */
146 *(volatile u32 *)(base + (PCI_FUNC(devfn) << 8) +
147 (where & 0xfffffffc));
151 shift = (where & 3) << 3;
152 data &= ~(0xffU << shift);
153 data |= ((val & 0xffU) << shift);
156 shift = (where & 2) << 3;
157 data &= ~(0xffffU << shift);
158 data |= ((val & 0xffffU) << shift);
164 emma2rh_out32(EMMA2RH_PCI_IWIN0_CTR, backup_win0);
165 return PCIBIOS_FUNC_NOT_SUPPORTED;
167 *(volatile u32 *)(base + (PCI_FUNC(devfn) << 8) +
168 (where & 0xfffffffc)) = data;
170 emma2rh_out32(EMMA2RH_PCI_IWIN0_CTR, backup_win0);
171 if (emma2rh_in32(EMMA2RH_PCI_INT) & RMABORT)
172 return PCIBIOS_DEVICE_NOT_FOUND;
174 return PCIBIOS_SUCCESSFUL;
177 struct pci_ops emma2rh_pci_ops = {
178 .read = pci_config_read,
179 .write = pci_config_write,