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-rw-r--r--arch/sh/drivers/pci/ops-sh4.c164
1 files changed, 164 insertions, 0 deletions
diff --git a/arch/sh/drivers/pci/ops-sh4.c b/arch/sh/drivers/pci/ops-sh4.c
new file mode 100644
index 000000000000..2d4371009a5e
--- /dev/null
+++ b/arch/sh/drivers/pci/ops-sh4.c
@@ -0,0 +1,164 @@
1/*
2 * Generic SH-4 / SH-4A PCIC operations (SH7751, SH7780).
3 *
4 * Copyright (C) 2002 - 2006 Paul Mundt
5 *
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License v2. See the file "COPYING" in the main directory of this archive
8 * for more details.
9 */
10#include <linux/pci.h>
11#include <asm/addrspace.h>
12#include <asm/io.h>
13#include "pci-sh4.h"
14
15/*
16 * Direct access to PCI hardware...
17 */
18#define CONFIG_CMD(bus, devfn, where) \
19 P1SEGADDR((bus->number << 16) | (devfn << 8) | (where & ~3))
20
21static DEFINE_SPINLOCK(sh4_pci_lock);
22
23/*
24 * Functions for accessing PCI configuration space with type 1 accesses
25 */
26static int sh4_pci_read(struct pci_bus *bus, unsigned int devfn,
27 int where, int size, u32 *val)
28{
29 unsigned long flags;
30 u32 data;
31
32 /*
33 * PCIPDR may only be accessed as 32 bit words,
34 * so we must do byte alignment by hand
35 */
36 spin_lock_irqsave(&sh4_pci_lock, flags);
37 pci_write_reg(CONFIG_CMD(bus, devfn, where), SH4_PCIPAR);
38 data = pci_read_reg(SH4_PCIPDR);
39 spin_unlock_irqrestore(&sh4_pci_lock, flags);
40
41 switch (size) {
42 case 1:
43 *val = (data >> ((where & 3) << 3)) & 0xff;
44 break;
45 case 2:
46 *val = (data >> ((where & 2) << 3)) & 0xffff;
47 break;
48 case 4:
49 *val = data;
50 break;
51 default:
52 return PCIBIOS_FUNC_NOT_SUPPORTED;
53 }
54
55 return PCIBIOS_SUCCESSFUL;
56}
57
58/*
59 * Since SH4 only does 32bit access we'll have to do a read,
60 * mask,write operation.
61 * We'll allow an odd byte offset, though it should be illegal.
62 */
63static int sh4_pci_write(struct pci_bus *bus, unsigned int devfn,
64 int where, int size, u32 val)
65{
66 unsigned long flags;
67 int shift;
68 u32 data;
69
70 spin_lock_irqsave(&sh4_pci_lock, flags);
71 pci_write_reg(CONFIG_CMD(bus, devfn, where), SH4_PCIPAR);
72 data = pci_read_reg(SH4_PCIPDR);
73 spin_unlock_irqrestore(&sh4_pci_lock, flags);
74
75 switch (size) {
76 case 1:
77 shift = (where & 3) << 3;
78 data &= ~(0xff << shift);
79 data |= ((val & 0xff) << shift);
80 break;
81 case 2:
82 shift = (where & 2) << 3;
83 data &= ~(0xffff << shift);
84 data |= ((val & 0xffff) << shift);
85 break;
86 case 4:
87 data = val;
88 break;
89 default:
90 return PCIBIOS_FUNC_NOT_SUPPORTED;
91 }
92
93 pci_write_reg(data, SH4_PCIPDR);
94
95 return PCIBIOS_SUCCESSFUL;
96}
97
98struct pci_ops sh4_pci_ops = {
99 .read = sh4_pci_read,
100 .write = sh4_pci_write,
101};
102
103/*
104 * Not really related to pci_ops, but it's common and not worth shoving
105 * somewhere else for now..
106 */
107static unsigned int pci_probe = PCI_PROBE_CONF1;
108
109int __init sh4_pci_check_direct(void)
110{
111 /*
112 * Check if configuration works.
113 */
114 if (pci_probe & PCI_PROBE_CONF1) {
115 unsigned int tmp = pci_read_reg(SH4_PCIPAR);
116
117 pci_write_reg(P1SEG, SH4_PCIPAR);
118
119 if (pci_read_reg(SH4_PCIPAR) == P1SEG) {
120 pci_write_reg(tmp, SH4_PCIPAR);
121 printk(KERN_INFO "PCI: Using configuration type 1\n");
122 request_region(PCI_REG(SH4_PCIPAR), 8, "PCI conf1");
123
124 return 0;
125 }
126
127 pci_write_reg(tmp, SH4_PCIPAR);
128 }
129
130 pr_debug("PCI: pci_check_direct failed\n");
131 return -EINVAL;
132}
133
134/* Handle generic fixups */
135static void __init pci_fixup_ide_bases(struct pci_dev *d)
136{
137 int i;
138
139 /*
140 * PCI IDE controllers use non-standard I/O port decoding, respect it.
141 */
142 if ((d->class >> 8) != PCI_CLASS_STORAGE_IDE)
143 return;
144 pr_debug("PCI: IDE base address fixup for %s\n", pci_name(d));
145 for(i = 0; i < 4; i++) {
146 struct resource *r = &d->resource[i];
147
148 if ((r->start & ~0x80) == 0x374) {
149 r->start |= 2;
150 r->end = r->start;
151 }
152 }
153}
154DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pci_fixup_ide_bases);
155
156char * __init pcibios_setup(char *str)
157{
158 if (!strcmp(str, "off")) {
159 pci_probe = 0;
160 return NULL;
161 }
162
163 return str;
164}