1/*
2 * Copyright (C) 1999, 2000, 2004  MIPS Technologies, Inc.
3 *	All rights reserved.
4 *	Authors: Carsten Langgaard <carstenl@mips.com>
5 *		 Maciej W. Rozycki <macro@mips.com>
6 *
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.
10 *
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
14 *  for more details.
15 *
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.
19 *
20 * MIPS boards specific PCI support.
21 */
22#include <linux/types.h>
23#include <linux/pci.h>
24#include <linux/kernel.h>
25
26#include <asm/mips-boards/bonito64.h>
27
28#define PCI_ACCESS_READ	 0
29#define PCI_ACCESS_WRITE 1
30
31#define CFG_SPACE_REG(offset) (void *)CKSEG1ADDR(_pcictrl_bonito_pcicfg + (offset))
32#define ID_SEL_BEGIN 10
33#define MAX_DEV_NUM (31 - ID_SEL_BEGIN)
34
35
36static int bonito64_pcibios_config_access(unsigned char access_type,
37				      struct pci_bus *bus,
38				      unsigned int devfn, int where,
39				      u32 * data)
40{
41	u32 busnum = bus->number;
42	u32 addr, type;
43	u32 dummy;
44	void *addrp;
45	int device = PCI_SLOT(devfn);
46	int function = PCI_FUNC(devfn);
47	int reg = where & ~3;
48
49	if (busnum == 0) {
50		/* Type 0 configuration for onboard PCI bus */
51		if (device > MAX_DEV_NUM)
52			return -1;
53
54		addr = (1 << (device + ID_SEL_BEGIN)) | (function << 8) | reg;
55		type = 0;
56	} else {
57		/* Type 1 configuration for offboard PCI bus */
58		addr = (busnum << 16) | (device << 11) | (function << 8) | reg;
59		type = 0x10000;
60	}
61
62	/* Clear aborts */
63	BONITO_PCICMD |= BONITO_PCICMD_MABORT_CLR | BONITO_PCICMD_MTABORT_CLR;
64
65	BONITO_PCIMAP_CFG = (addr >> 16) | type;
66
67	/* Flush Bonito register block */
68	dummy = BONITO_PCIMAP_CFG;
69	mmiowb();
70
71	addrp = CFG_SPACE_REG(addr & 0xffff);
72	if (access_type == PCI_ACCESS_WRITE) {
73		writel(cpu_to_le32(*data), addrp);
74		/* Wait till done */
75		while (BONITO_PCIMSTAT & 0xF);
76	} else {
77		*data = le32_to_cpu(readl(addrp));
78	}
79
80	/* Detect Master/Target abort */
81	if (BONITO_PCICMD & (BONITO_PCICMD_MABORT_CLR |
82			     BONITO_PCICMD_MTABORT_CLR)) {
83		/* Error occurred */
84
85		/* Clear bits */
86		BONITO_PCICMD |= (BONITO_PCICMD_MABORT_CLR |
87				  BONITO_PCICMD_MTABORT_CLR);
88
89		return -1;
90	}
91
92	return 0;
93
94}
95
96
97/*
98 * We can't address 8 and 16 bit words directly.  Instead we have to
99 * read/write a 32bit word and mask/modify the data we actually want.
100 */
101static int bonito64_pcibios_read(struct pci_bus *bus, unsigned int devfn,
102			     int where, int size, u32 * val)
103{
104	u32 data = 0;
105
106	if ((size == 2) && (where & 1))
107		return PCIBIOS_BAD_REGISTER_NUMBER;
108	else if ((size == 4) && (where & 3))
109		return PCIBIOS_BAD_REGISTER_NUMBER;
110
111	if (bonito64_pcibios_config_access(PCI_ACCESS_READ, bus, devfn, where,
112				       &data))
113		return -1;
114
115	if (size == 1)
116		*val = (data >> ((where & 3) << 3)) & 0xff;
117	else if (size == 2)
118		*val = (data >> ((where & 3) << 3)) & 0xffff;
119	else
120		*val = data;
121
122	return PCIBIOS_SUCCESSFUL;
123}
124
125static int bonito64_pcibios_write(struct pci_bus *bus, unsigned int devfn,
126			      int where, int size, u32 val)
127{
128	u32 data = 0;
129
130	if ((size == 2) && (where & 1))
131		return PCIBIOS_BAD_REGISTER_NUMBER;
132	else if ((size == 4) && (where & 3))
133		return PCIBIOS_BAD_REGISTER_NUMBER;
134
135	if (size == 4)
136		data = val;
137	else {
138		if (bonito64_pcibios_config_access(PCI_ACCESS_READ, bus, devfn,
139					       where, &data))
140			return -1;
141
142		if (size == 1)
143			data = (data & ~(0xff << ((where & 3) << 3))) |
144				(val << ((where & 3) << 3));
145		else if (size == 2)
146			data = (data & ~(0xffff << ((where & 3) << 3))) |
147				(val << ((where & 3) << 3));
148	}
149
150	if (bonito64_pcibios_config_access(PCI_ACCESS_WRITE, bus, devfn, where,
151				       &data))
152		return -1;
153
154	return PCIBIOS_SUCCESSFUL;
155}
156
157struct pci_ops bonito64_pci_ops = {
158	.read = bonito64_pcibios_read,
159	.write = bonito64_pcibios_write
160};
161