2 * fuloong2e specific PCI support.
4 * Copyright (C) 1999, 2000, 2004 MIPS Technologies, Inc.
6 * Authors: Carsten Langgaard <carstenl@mips.com>
7 * Maciej W. Rozycki <macro@mips.com>
9 * Copyright (C) 2009 Lemote Inc.
10 * Author: Wu Zhangjin <wuzj@lemote.com>
12 * This program is free software; you can distribute it and/or modify it
13 * under the terms of the GNU General Public License (Version 2) as
14 * published by the Free Software Foundation.
16 #include <linux/types.h>
17 #include <linux/pci.h>
18 #include <linux/kernel.h>
19 #include <linux/init.h>
24 #include <cs5536/cs5536_pci.h>
25 #include <cs5536/cs5536.h>
28 #define PCI_ACCESS_READ 0
29 #define PCI_ACCESS_WRITE 1
31 #define CFG_SPACE_REG(offset) \
32 (void *)CKSEG1ADDR(LOONGSON_PCICFG_BASE | (offset))
33 #define ID_SEL_BEGIN 11
34 #define MAX_DEV_NUM (31 - ID_SEL_BEGIN)
37 static int loongson_pcibios_config_access(unsigned char access_type,
39 unsigned int devfn, int where,
42 u32 busnum = bus->number;
46 int device = PCI_SLOT(devfn);
47 int function = PCI_FUNC(devfn);
51 /* board-specific part,currently,only fuloong2f,yeeloong2f
52 * use CS5536, fuloong2e use via686b, gdium has no
56 /* cs5536_pci_conf_read4/write4() will call _rdmsr/_wrmsr() to
57 * access the regsters PCI_MSR_ADDR, PCI_MSR_DATA_LO,
58 * PCI_MSR_DATA_HI, which is bigger than PCI_MSR_CTRL, so, it
59 * will not go this branch, but the others. so, no calling dead
62 if ((PCI_IDSEL_CS5536 == device) && (reg < PCI_MSR_CTRL)) {
63 switch (access_type) {
65 *data = cs5536_pci_conf_read4(function, reg);
67 case PCI_ACCESS_WRITE:
68 cs5536_pci_conf_write4(function, reg, *data);
74 /* Type 0 configuration for onboard PCI bus */
75 if (device > MAX_DEV_NUM)
78 addr = (1 << (device + ID_SEL_BEGIN)) | (function << 8) | reg;
81 /* Type 1 configuration for offboard PCI bus */
82 addr = (busnum << 16) | (device << 11) | (function << 8) | reg;
87 LOONGSON_PCICMD |= LOONGSON_PCICMD_MABORT_CLR | \
88 LOONGSON_PCICMD_MTABORT_CLR;
90 LOONGSON_PCIMAP_CFG = (addr >> 16) | type;
92 /* Flush Bonito register block */
93 dummy = LOONGSON_PCIMAP_CFG;
96 addrp = CFG_SPACE_REG(addr & 0xffff);
97 if (access_type == PCI_ACCESS_WRITE)
98 writel(cpu_to_le32(*data), addrp);
100 *data = le32_to_cpu(readl(addrp));
102 /* Detect Master/Target abort */
103 if (LOONGSON_PCICMD & (LOONGSON_PCICMD_MABORT_CLR |
104 LOONGSON_PCICMD_MTABORT_CLR)) {
108 LOONGSON_PCICMD |= (LOONGSON_PCICMD_MABORT_CLR |
109 LOONGSON_PCICMD_MTABORT_CLR);
120 * We can't address 8 and 16 bit words directly. Instead we have to
121 * read/write a 32bit word and mask/modify the data we actually want.
123 static int loongson_pcibios_read(struct pci_bus *bus, unsigned int devfn,
124 int where, int size, u32 *val)
128 if ((size == 2) && (where & 1))
129 return PCIBIOS_BAD_REGISTER_NUMBER;
130 else if ((size == 4) && (where & 3))
131 return PCIBIOS_BAD_REGISTER_NUMBER;
133 if (loongson_pcibios_config_access(PCI_ACCESS_READ, bus, devfn, where,
138 *val = (data >> ((where & 3) << 3)) & 0xff;
140 *val = (data >> ((where & 3) << 3)) & 0xffff;
144 return PCIBIOS_SUCCESSFUL;
147 static int loongson_pcibios_write(struct pci_bus *bus, unsigned int devfn,
148 int where, int size, u32 val)
152 if ((size == 2) && (where & 1))
153 return PCIBIOS_BAD_REGISTER_NUMBER;
154 else if ((size == 4) && (where & 3))
155 return PCIBIOS_BAD_REGISTER_NUMBER;
160 if (loongson_pcibios_config_access(PCI_ACCESS_READ, bus, devfn,
165 data = (data & ~(0xff << ((where & 3) << 3))) |
166 (val << ((where & 3) << 3));
168 data = (data & ~(0xffff << ((where & 3) << 3))) |
169 (val << ((where & 3) << 3));
172 if (loongson_pcibios_config_access(PCI_ACCESS_WRITE, bus, devfn, where,
176 return PCIBIOS_SUCCESSFUL;
179 struct pci_ops loongson_pci_ops = {
180 .read = loongson_pcibios_read,
181 .write = loongson_pcibios_write
185 void _rdmsr(u32 msr, u32 *hi, u32 *lo)
187 struct pci_bus bus = {
188 .number = PCI_BUS_CS5536
190 u32 devfn = PCI_DEVFN(PCI_IDSEL_CS5536, 0);
191 loongson_pcibios_write(&bus, devfn, PCI_MSR_ADDR, 4, msr);
192 loongson_pcibios_read(&bus, devfn, PCI_MSR_DATA_LO, 4, lo);
193 loongson_pcibios_read(&bus, devfn, PCI_MSR_DATA_HI, 4, hi);
195 EXPORT_SYMBOL(_rdmsr);
197 void _wrmsr(u32 msr, u32 hi, u32 lo)
199 struct pci_bus bus = {
200 .number = PCI_BUS_CS5536
202 u32 devfn = PCI_DEVFN(PCI_IDSEL_CS5536, 0);
203 loongson_pcibios_write(&bus, devfn, PCI_MSR_ADDR, 4, msr);
204 loongson_pcibios_write(&bus, devfn, PCI_MSR_DATA_LO, 4, lo);
205 loongson_pcibios_write(&bus, devfn, PCI_MSR_DATA_HI, 4, hi);
207 EXPORT_SYMBOL(_wrmsr);