aboutsummaryrefslogtreecommitdiff
path: root/arch/powerpc/kernel/io-workarounds.c
blob: 50e90b7e713993109022db1f7b4d4bf0905ded1f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
/*
 * Support PCI IO workaround
 *
 *  Copyright (C) 2006 Benjamin Herrenschmidt <benh@kernel.crashing.org>
 *		       IBM, Corp.
 *  (C) Copyright 2007-2008 TOSHIBA CORPORATION
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#undef DEBUG

#include <linux/kernel.h>
#include <linux/sched.h>	/* for init_mm */

#include <asm/io.h>
#include <asm/machdep.h>
#include <asm/pgtable.h>
#include <asm/ppc-pci.h>
#include <asm/io-workarounds.h>

#define IOWA_MAX_BUS	8

static struct iowa_bus iowa_busses[IOWA_MAX_BUS];
static unsigned int iowa_bus_count;

static struct iowa_bus *iowa_pci_find(unsigned long vaddr, unsigned long paddr)
{
	int i, j;
	struct resource *res;
	unsigned long vstart, vend;

	for (i = 0; i < iowa_bus_count; i++) {
		struct iowa_bus *bus = &iowa_busses[i];
		struct pci_controller *phb = bus->phb;

		if (vaddr) {
			vstart = (unsigned long)phb->io_base_virt;
			vend = vstart + phb->pci_io_size - 1;
			if ((vaddr >= vstart) && (vaddr <= vend))
				return bus;
		}

		if (paddr)
			for (j = 0; j < 3; j++) {
				res = &phb->mem_resources[j];
				if (paddr >= res->start && paddr <= res->end)
					return bus;
			}
	}

	return NULL;
}

struct iowa_bus *iowa_mem_find_bus(const PCI_IO_ADDR addr)
{
	struct iowa_bus *bus;
	int token;

	token = PCI_GET_ADDR_TOKEN(addr);

	if (token && token <= iowa_bus_count)
		bus = &iowa_busses[token - 1];
	else {
		unsigned long vaddr, paddr;
		pte_t *ptep;

		vaddr = (unsigned long)PCI_FIX_ADDR(addr);
		if (vaddr < PHB_IO_BASE || vaddr >= PHB_IO_END)
			return NULL;

		ptep = find_linux_pte(init_mm.pgd, vaddr);
		if (ptep == NULL)
			paddr = 0;
		else
			paddr = pte_pfn(*ptep) << PAGE_SHIFT;
		bus = iowa_pci_find(vaddr, paddr);

		if (bus == NULL)
			return NULL;
	}

	return bus;
}

struct iowa_bus *iowa_pio_find_bus(unsigned long port)
{
	unsigned long vaddr = (unsigned long)pci_io_base + port;
	return iowa_pci_find(vaddr, 0);
}


#define DEF_PCI_AC_RET(name, ret, at, al, space, aa)		\
static ret iowa_##name at					\
{								\
	struct iowa_bus *bus;					\
	bus = iowa_##space##_find_bus(aa);			\
	if (bus && bus->ops && bus->ops->name)			\
		return bus->ops->name al;			\
	return __do_##name al;					\
}

#define DEF_PCI_AC_NORET(name, at, al, space, aa)		\
static void iowa_##name at					\
{								\
	struct iowa_bus *bus;					\
	bus = iowa_##space##_find_bus(aa);			\
	if (bus && bus->ops && bus->ops->name) {		\
		bus->ops->name al;				\
		return;						\
	}							\
	__do_##name al;						\
}

#include <asm/io-defs.h>

#undef DEF_PCI_AC_RET
#undef DEF_PCI_AC_NORET

static const struct ppc_pci_io iowa_pci_io = {

#define DEF_PCI_AC_RET(name, ret, at, al, space, aa)	.name = iowa_##name,
#define DEF_PCI_AC_NORET(name, at, al, space, aa)	.name = iowa_##name,

#include <asm/io-defs.h>

#undef DEF_PCI_AC_RET
#undef DEF_PCI_AC_NORET

};

static void __iomem *iowa_ioremap(phys_addr_t addr, unsigned long size,
				  unsigned long flags, void *caller)
{
	struct iowa_bus *bus;
	void __iomem *res = __ioremap_caller(addr, size, flags, caller);
	int busno;

	bus = iowa_pci_find(0, (unsigned long)addr);
	if (bus != NULL) {
		busno = bus - iowa_busses;
		PCI_SET_ADDR_TOKEN(res, busno + 1);
	}
	return res;
}

/* Enable IO workaround */
static void io_workaround_init(void)
{
	static int io_workaround_inited;

	if (io_workaround_inited)
		return;
	ppc_pci_io = iowa_pci_io;
	ppc_md.ioremap = iowa_ioremap;
	io_workaround_inited = 1;
}

/* Register new bus to support workaround */
void iowa_register_bus(struct pci_controller *phb, struct ppc_pci_io *ops,
		       int (*initfunc)(struct iowa_bus *, void *), void *data)
{
	struct iowa_bus *bus;
	struct device_node *np = phb->dn;

	io_workaround_init();

	if (iowa_bus_count >= IOWA_MAX_BUS) {
		pr_err("IOWA:Too many pci bridges, "
		       "workarounds disabled for %s\n", np->full_name);
		return;
	}

	bus = &iowa_busses[iowa_bus_count];
	bus->phb = phb;
	bus->ops = ops;
	bus->private = data;

	if (initfunc)
		if ((*initfunc)(bus, data))
			return;

	iowa_bus_count++;

	pr_debug("IOWA:[%d]Add bus, %s.\n", iowa_bus_count-1, np->full_name);
}