xref: /linux/arch/sh/drivers/pci/ops-sh4.c (revision 5f7e08ca7b657f5678dd62a080f7f3a8f923ad02)
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 
21 static DEFINE_SPINLOCK(sh4_pci_lock);
22 
23 /*
24  * Functions for accessing PCI configuration space with type 1 accesses
25  */
26 static 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  */
63 static 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 
98 struct 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  */
107 static unsigned int pci_probe = PCI_PROBE_CONF1;
108 
109 int __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 */
135 static 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 }
154 DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pci_fixup_ide_bases);
155 
156 char * __devinit pcibios_setup(char *str)
157 {
158 	if (!strcmp(str, "off")) {
159 		pci_probe = 0;
160 		return NULL;
161 	}
162 
163 	return str;
164 }
165 
166 int __attribute__((weak)) pci_fixup_pcic(void)
167 {
168 	/* Nothing to do. */
169 	return 0;
170 }
171