2 * Copyright (C) 1999, 2000, 2004 MIPS Technologies, Inc.
4 * Authors: Carsten Langgaard <carstenl@mips.com>
5 * Maciej W. Rozycki <macro@mips.com>
7 * This program is free software; you can distribute it and/or modify it
8 * under the terms of the GNU General Public License (Version 2) as
9 * published by the Free Software Foundation.
11 * This program is distributed in the hope it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 * You should have received a copy of the GNU General Public License along
17 * with this program; if not, write to the Free Software Foundation, Inc.,
18 * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
20 * MIPS boards specific PCI support.
22 #include <linux/types.h>
23 #include <linux/pci.h>
24 #include <linux/kernel.h>
25 #include <linux/init.h>
27 #include <asm/mips-boards/bonito64.h>
29 #define PCI_ACCESS_READ 0
30 #define PCI_ACCESS_WRITE 1
33 * PCI configuration cycle AD bus definition
36 #define PCI_CFG_TYPE0_REG_SHF 0
37 #define PCI_CFG_TYPE0_FUNC_SHF 8
40 #define PCI_CFG_TYPE1_REG_SHF 0
41 #define PCI_CFG_TYPE1_FUNC_SHF 8
42 #define PCI_CFG_TYPE1_DEV_SHF 11
43 #define PCI_CFG_TYPE1_BUS_SHF 16
45 static int bonito64_pcibios_config_access(unsigned char access_type,
47 unsigned int devfn, int where,
50 unsigned char busnum = bus->number;
54 /* Algorithmics Bonito64 system controller. */
56 if ((busnum == 0) && (PCI_SLOT(devfn) > 21)) {
57 /* We number bus 0 devices from 0..21 */
61 /* Clear cause register bits */
62 BONITO_PCICMD |= (BONITO_PCICMD_MABORT_CLR |
63 BONITO_PCICMD_MTABORT_CLR);
66 * Setup pattern to be used as PCI "address" for
71 pci_addr = (u64) 1 << (PCI_SLOT(devfn) + 10);
74 pci_addr = busnum << PCI_CFG_TYPE1_BUS_SHF;
78 PCI_SLOT(devfn) << PCI_CFG_TYPE1_DEV_SHF;
81 /* Function (same for Type 0/1) */
82 pci_addr |= PCI_FUNC(devfn) << PCI_CFG_TYPE0_FUNC_SHF;
84 /* Register number (same for Type 0/1) */
85 pci_addr |= (where & ~0x3) << PCI_CFG_TYPE0_REG_SHF;
89 BONITO_PCIMAP_CFG = pci_addr >> 16;
92 BONITO_PCIMAP_CFG = (pci_addr >> 16) | 0x10000;
97 /* Flush Bonito register block */
98 dummy = BONITO_PCIMAP_CFG;
102 if (access_type == PCI_ACCESS_WRITE) {
103 *(volatile u32 *) (_pcictrl_bonito_pcicfg + (u32)pci_addr) = *(u32 *) data;
106 while (BONITO_PCIMSTAT & 0xF);
108 *(u32 *) data = *(volatile u32 *) (_pcictrl_bonito_pcicfg + (u32)pci_addr);
111 /* Detect Master/Target abort */
112 if (BONITO_PCICMD & (BONITO_PCICMD_MABORT_CLR |
113 BONITO_PCICMD_MTABORT_CLR)) {
117 BONITO_PCICMD |= (BONITO_PCICMD_MABORT_CLR |
118 BONITO_PCICMD_MTABORT_CLR);
128 * We can't address 8 and 16 bit words directly. Instead we have to
129 * read/write a 32bit word and mask/modify the data we actually want.
131 static int bonito64_pcibios_read(struct pci_bus *bus, unsigned int devfn,
132 int where, int size, u32 * val)
136 if ((size == 2) && (where & 1))
137 return PCIBIOS_BAD_REGISTER_NUMBER;
138 else if ((size == 4) && (where & 3))
139 return PCIBIOS_BAD_REGISTER_NUMBER;
141 if (bonito64_pcibios_config_access(PCI_ACCESS_READ, bus, devfn, where,
146 *val = (data >> ((where & 3) << 3)) & 0xff;
148 *val = (data >> ((where & 3) << 3)) & 0xffff;
152 return PCIBIOS_SUCCESSFUL;
155 static int bonito64_pcibios_write(struct pci_bus *bus, unsigned int devfn,
156 int where, int size, u32 val)
160 if ((size == 2) && (where & 1))
161 return PCIBIOS_BAD_REGISTER_NUMBER;
162 else if ((size == 4) && (where & 3))
163 return PCIBIOS_BAD_REGISTER_NUMBER;
168 if (bonito64_pcibios_config_access(PCI_ACCESS_READ, bus, devfn,
173 data = (data & ~(0xff << ((where & 3) << 3))) |
174 (val << ((where & 3) << 3));
176 data = (data & ~(0xffff << ((where & 3) << 3))) |
177 (val << ((where & 3) << 3));
180 if (bonito64_pcibios_config_access(PCI_ACCESS_WRITE, bus, devfn, where,
184 return PCIBIOS_SUCCESSFUL;
187 struct pci_ops bonito64_pci_ops = {
188 .read = bonito64_pcibios_read,
189 .write = bonito64_pcibios_write