1/*
2 *  arch/mips/pci/ops-emma2rh.c
3 *      This file defines the PCI operation for EMMA2RH.
4 *
5 *  Copyright (C) NEC Electronics Corporation 2004-2006
6 *
7 *  This file is based on the arch/mips/pci/ops-vr41xx.c
8 *
9 *	Copyright 2001 MontaVista Software Inc.
10 *
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.
15 *
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.
20 *
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
24 */
25
26#include <linux/pci.h>
27#include <linux/kernel.h>
28#include <linux/types.h>
29
30#include <asm/addrspace.h>
31#include <asm/debug.h>
32
33#include <asm/emma2rh/emma2rh.h>
34
35#define RTABORT (0x1<<9)
36#define RMABORT (0x1<<10)
37#define EMMA2RH_PCI_SLOT_NUM 9	/* 0000:09.0 is final PCI device */
38
39/*
40 * access config space
41 */
42
43static int check_args(struct pci_bus *bus, u32 devfn, u32 * bus_num)
44{
45	/* check if the bus is top-level */
46	if (bus->parent != NULL) {
47		*bus_num = bus->number;
48		db_assert(bus_num != 0);
49	} else
50		*bus_num = 0;
51
52	if (*bus_num == 0) {
53		/* Type 0 */
54		if (PCI_SLOT(devfn) >= 10)
55			return PCIBIOS_DEVICE_NOT_FOUND;
56	} else {
57		/* Type 1 */
58		if ((*bus_num >= 64) || (PCI_SLOT(devfn) >= 16))
59			return PCIBIOS_DEVICE_NOT_FOUND;
60	}
61	return 0;
62}
63
64static inline int set_pci_configuration_address(unsigned char bus_num,
65						unsigned int devfn, int where)
66{
67	u32 config_win0;
68
69	emma2rh_out32(EMMA2RH_PCI_INT, ~RMABORT);
70	if (bus_num == 0)
71		/*
72		 * Type 0 configuration
73		 */
74		config_win0 = (1 << (22 + PCI_SLOT(devfn))) | (5 << 9);
75	else
76		/*
77		 * Type 1 configuration
78		 */
79		config_win0 = (bus_num << 26) | (PCI_SLOT(devfn) << 22) |
80		    (1 << 15) | (5 << 9);
81
82	emma2rh_out32(EMMA2RH_PCI_IWIN0_CTR, config_win0);
83
84	return 0;
85}
86
87static int pci_config_read(struct pci_bus *bus, unsigned int devfn, int where,
88			   int size, uint32_t * val)
89{
90	u32 bus_num;
91	u32 base = KSEG1ADDR(EMMA2RH_PCI_CONFIG_BASE);
92	u32 backup_win0;
93	u32 data;
94
95	*val = 0xffffffffU;
96
97	if (check_args(bus, devfn, &bus_num) == PCIBIOS_DEVICE_NOT_FOUND)
98		return PCIBIOS_DEVICE_NOT_FOUND;
99
100	backup_win0 = emma2rh_in32(EMMA2RH_PCI_IWIN0_CTR);
101
102	if (set_pci_configuration_address(bus_num, devfn, where) < 0)
103		return PCIBIOS_DEVICE_NOT_FOUND;
104
105	data =
106	    *(volatile u32 *)(base + (PCI_FUNC(devfn) << 8) +
107			      (where & 0xfffffffc));
108
109	switch (size) {
110	case 1:
111		*val = (data >> ((where & 3) << 3)) & 0xffU;
112		break;
113	case 2:
114		*val = (data >> ((where & 2) << 3)) & 0xffffU;
115		break;
116	case 4:
117		*val = data;
118		break;
119	default:
120		emma2rh_out32(EMMA2RH_PCI_IWIN0_CTR, backup_win0);
121		return PCIBIOS_FUNC_NOT_SUPPORTED;
122	}
123
124	emma2rh_out32(EMMA2RH_PCI_IWIN0_CTR, backup_win0);
125
126	if (emma2rh_in32(EMMA2RH_PCI_INT) & RMABORT)
127		return PCIBIOS_DEVICE_NOT_FOUND;
128
129	return PCIBIOS_SUCCESSFUL;
130}
131
132static int pci_config_write(struct pci_bus *bus, unsigned int devfn, int where,
133			    int size, u32 val)
134{
135	u32 bus_num;
136	u32 base = KSEG1ADDR(EMMA2RH_PCI_CONFIG_BASE);
137	u32 backup_win0;
138	u32 data;
139	int shift;
140
141	if (check_args(bus, devfn, &bus_num) == PCIBIOS_DEVICE_NOT_FOUND)
142		return PCIBIOS_DEVICE_NOT_FOUND;
143
144	backup_win0 = emma2rh_in32(EMMA2RH_PCI_IWIN0_CTR);
145
146	if (set_pci_configuration_address(bus_num, devfn, where) < 0)
147		return PCIBIOS_DEVICE_NOT_FOUND;
148
149	/* read modify write */
150	data =
151	    *(volatile u32 *)(base + (PCI_FUNC(devfn) << 8) +
152			      (where & 0xfffffffc));
153
154	switch (size) {
155	case 1:
156		shift = (where & 3) << 3;
157		data &= ~(0xffU << shift);
158		data |= ((val & 0xffU) << shift);
159		break;
160	case 2:
161		shift = (where & 2) << 3;
162		data &= ~(0xffffU << shift);
163		data |= ((val & 0xffffU) << shift);
164		break;
165	case 4:
166		data = val;
167		break;
168	default:
169		emma2rh_out32(EMMA2RH_PCI_IWIN0_CTR, backup_win0);
170		return PCIBIOS_FUNC_NOT_SUPPORTED;
171	}
172	*(volatile u32 *)(base + (PCI_FUNC(devfn) << 8) +
173			  (where & 0xfffffffc)) = data;
174
175	emma2rh_out32(EMMA2RH_PCI_IWIN0_CTR, backup_win0);
176	if (emma2rh_in32(EMMA2RH_PCI_INT) & RMABORT)
177		return PCIBIOS_DEVICE_NOT_FOUND;
178
179	return PCIBIOS_SUCCESSFUL;
180}
181
182struct pci_ops emma2rh_pci_ops = {
183	.read = pci_config_read,
184	.write = pci_config_write,
185};
186