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Benjamin Herrenschmidt014da7f2006-11-11 17:25:12 +11001/*
Ishizaki Kou7cfb62a2008-04-24 19:21:10 +10002 * Support PCI IO workaround
3 *
Benjamin Herrenschmidt014da7f2006-11-11 17:25:12 +11004 * Copyright (C) 2006 Benjamin Herrenschmidt <benh@kernel.crashing.org>
5 * IBM, Corp.
Ishizaki Kou7cfb62a2008-04-24 19:21:10 +10006 * (C) Copyright 2007-2008 TOSHIBA CORPORATION
Benjamin Herrenschmidt014da7f2006-11-11 17:25:12 +11007 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12#undef DEBUG
13
14#include <linux/kernel.h>
Ishizaki Kou7cfb62a2008-04-24 19:21:10 +100015
Benjamin Herrenschmidt014da7f2006-11-11 17:25:12 +110016#include <asm/io.h>
17#include <asm/machdep.h>
Ishizaki Kou7cfb62a2008-04-24 19:21:10 +100018#include <asm/pgtable.h>
Benjamin Herrenschmidt014da7f2006-11-11 17:25:12 +110019#include <asm/ppc-pci.h>
Michael Ellerman3cc30d02011-04-11 21:25:01 +000020#include <asm/io-workarounds.h>
Benjamin Herrenschmidt014da7f2006-11-11 17:25:12 +110021
Ishizaki Kou7cfb62a2008-04-24 19:21:10 +100022#define IOWA_MAX_BUS 8
Benjamin Herrenschmidt014da7f2006-11-11 17:25:12 +110023
Ishizaki Kou7cfb62a2008-04-24 19:21:10 +100024static struct iowa_bus iowa_busses[IOWA_MAX_BUS];
25static unsigned int iowa_bus_count;
Benjamin Herrenschmidt014da7f2006-11-11 17:25:12 +110026
Ishizaki Kou7cfb62a2008-04-24 19:21:10 +100027static struct iowa_bus *iowa_pci_find(unsigned long vaddr, unsigned long paddr)
Benjamin Herrenschmidt014da7f2006-11-11 17:25:12 +110028{
Ishizaki Kou7cfb62a2008-04-24 19:21:10 +100029 int i, j;
30 struct resource *res;
31 unsigned long vstart, vend;
Benjamin Herrenschmidt014da7f2006-11-11 17:25:12 +110032
Ishizaki Kou7cfb62a2008-04-24 19:21:10 +100033 for (i = 0; i < iowa_bus_count; i++) {
34 struct iowa_bus *bus = &iowa_busses[i];
35 struct pci_controller *phb = bus->phb;
36
37 if (vaddr) {
38 vstart = (unsigned long)phb->io_base_virt;
39 vend = vstart + phb->pci_io_size - 1;
40 if ((vaddr >= vstart) && (vaddr <= vend))
41 return bus;
42 }
43
44 if (paddr)
45 for (j = 0; j < 3; j++) {
46 res = &phb->mem_resources[j];
47 if (paddr >= res->start && paddr <= res->end)
48 return bus;
49 }
Benjamin Herrenschmidt014da7f2006-11-11 17:25:12 +110050 }
Ishizaki Kou7cfb62a2008-04-24 19:21:10 +100051
Benjamin Herrenschmidt014da7f2006-11-11 17:25:12 +110052 return NULL;
53}
54
Ishizaki Kou7cfb62a2008-04-24 19:21:10 +100055struct iowa_bus *iowa_mem_find_bus(const PCI_IO_ADDR addr)
Benjamin Herrenschmidt014da7f2006-11-11 17:25:12 +110056{
Ishizaki Kou7cfb62a2008-04-24 19:21:10 +100057 struct iowa_bus *bus;
Benjamin Herrenschmidt014da7f2006-11-11 17:25:12 +110058 int token;
59
Benjamin Herrenschmidt014da7f2006-11-11 17:25:12 +110060 token = PCI_GET_ADDR_TOKEN(addr);
61
Ishizaki Kou7cfb62a2008-04-24 19:21:10 +100062 if (token && token <= iowa_bus_count)
63 bus = &iowa_busses[token - 1];
Benjamin Herrenschmidt014da7f2006-11-11 17:25:12 +110064 else {
65 unsigned long vaddr, paddr;
66 pte_t *ptep;
67
Benjamin Herrenschmidt014da7f2006-11-11 17:25:12 +110068 vaddr = (unsigned long)PCI_FIX_ADDR(addr);
Ishizaki Kou7cfb62a2008-04-24 19:21:10 +100069 if (vaddr < PHB_IO_BASE || vaddr >= PHB_IO_END)
70 return NULL;
Benjamin Herrenschmidt014da7f2006-11-11 17:25:12 +110071
Benjamin Herrenschmidt014da7f2006-11-11 17:25:12 +110072 ptep = find_linux_pte(init_mm.pgd, vaddr);
73 if (ptep == NULL)
74 paddr = 0;
75 else
76 paddr = pte_pfn(*ptep) << PAGE_SHIFT;
Ishizaki Kou7cfb62a2008-04-24 19:21:10 +100077 bus = iowa_pci_find(vaddr, paddr);
Benjamin Herrenschmidt014da7f2006-11-11 17:25:12 +110078
Benjamin Herrenschmidt014da7f2006-11-11 17:25:12 +110079 if (bus == NULL)
Ishizaki Kou7cfb62a2008-04-24 19:21:10 +100080 return NULL;
Benjamin Herrenschmidt014da7f2006-11-11 17:25:12 +110081 }
82
Ishizaki Kou7cfb62a2008-04-24 19:21:10 +100083 return bus;
Benjamin Herrenschmidt014da7f2006-11-11 17:25:12 +110084}
85
Ishizaki Kou7cfb62a2008-04-24 19:21:10 +100086struct iowa_bus *iowa_pio_find_bus(unsigned long port)
Benjamin Herrenschmidt014da7f2006-11-11 17:25:12 +110087{
Ishizaki Kou7cfb62a2008-04-24 19:21:10 +100088 unsigned long vaddr = (unsigned long)pci_io_base + port;
89 return iowa_pci_find(vaddr, 0);
Benjamin Herrenschmidt014da7f2006-11-11 17:25:12 +110090}
91
92
Ishizaki Kou7cfb62a2008-04-24 19:21:10 +100093#define DEF_PCI_AC_RET(name, ret, at, al, space, aa) \
94static ret iowa_##name at \
95{ \
96 struct iowa_bus *bus; \
97 bus = iowa_##space##_find_bus(aa); \
98 if (bus && bus->ops && bus->ops->name) \
99 return bus->ops->name al; \
100 return __do_##name al; \
101}
102
103#define DEF_PCI_AC_NORET(name, at, al, space, aa) \
104static void iowa_##name at \
105{ \
106 struct iowa_bus *bus; \
107 bus = iowa_##space##_find_bus(aa); \
108 if (bus && bus->ops && bus->ops->name) { \
109 bus->ops->name al; \
110 return; \
111 } \
112 __do_##name al; \
113}
114
115#include <asm/io-defs.h>
116
117#undef DEF_PCI_AC_RET
118#undef DEF_PCI_AC_NORET
119
Ishizaki Kou70122552008-05-14 19:05:19 +1000120static const struct ppc_pci_io __devinitconst iowa_pci_io = {
Ishizaki Kou7cfb62a2008-04-24 19:21:10 +1000121
122#define DEF_PCI_AC_RET(name, ret, at, al, space, aa) .name = iowa_##name,
123#define DEF_PCI_AC_NORET(name, at, al, space, aa) .name = iowa_##name,
124
125#include <asm/io-defs.h>
126
127#undef DEF_PCI_AC_RET
128#undef DEF_PCI_AC_NORET
129
130};
131
Ingo Molnarb36ac9e2009-01-06 14:03:44 +0000132static void __iomem *iowa_ioremap(phys_addr_t addr, unsigned long size,
Benjamin Herrenschmidt1cdab552009-02-22 16:19:14 +0000133 unsigned long flags, void *caller)
Benjamin Herrenschmidt014da7f2006-11-11 17:25:12 +1100134{
Ishizaki Kou7cfb62a2008-04-24 19:21:10 +1000135 struct iowa_bus *bus;
Benjamin Herrenschmidt1cdab552009-02-22 16:19:14 +0000136 void __iomem *res = __ioremap_caller(addr, size, flags, caller);
Benjamin Herrenschmidt014da7f2006-11-11 17:25:12 +1100137 int busno;
138
Ingo Molnarb36ac9e2009-01-06 14:03:44 +0000139 bus = iowa_pci_find(0, (unsigned long)addr);
Benjamin Herrenschmidt014da7f2006-11-11 17:25:12 +1100140 if (bus != NULL) {
Ishizaki Kou7cfb62a2008-04-24 19:21:10 +1000141 busno = bus - iowa_busses;
Benjamin Herrenschmidt014da7f2006-11-11 17:25:12 +1100142 PCI_SET_ADDR_TOKEN(res, busno + 1);
143 }
Benjamin Herrenschmidt014da7f2006-11-11 17:25:12 +1100144 return res;
145}
146
Michael Ellermand1109b72011-04-11 21:25:02 +0000147/* Enable IO workaround */
148static void __devinit io_workaround_init(void)
149{
150 static int io_workaround_inited;
151
152 if (io_workaround_inited)
153 return;
154 ppc_pci_io = iowa_pci_io;
155 ppc_md.ioremap = iowa_ioremap;
156 io_workaround_inited = 1;
157}
158
159/* Register new bus to support workaround */
Ishizaki Kou70122552008-05-14 19:05:19 +1000160void __devinit iowa_register_bus(struct pci_controller *phb,
Ishizaki Kou7cfb62a2008-04-24 19:21:10 +1000161 struct ppc_pci_io *ops,
162 int (*initfunc)(struct iowa_bus *, void *), void *data)
Benjamin Herrenschmidt014da7f2006-11-11 17:25:12 +1100163{
Ishizaki Kou7cfb62a2008-04-24 19:21:10 +1000164 struct iowa_bus *bus;
Stephen Rothwell44ef3392007-12-10 14:33:21 +1100165 struct device_node *np = phb->dn;
Benjamin Herrenschmidt014da7f2006-11-11 17:25:12 +1100166
Michael Ellermand1109b72011-04-11 21:25:02 +0000167 io_workaround_init();
168
Ishizaki Kou7cfb62a2008-04-24 19:21:10 +1000169 if (iowa_bus_count >= IOWA_MAX_BUS) {
170 pr_err("IOWA:Too many pci bridges, "
171 "workarounds disabled for %s\n", np->full_name);
Benjamin Herrenschmidt014da7f2006-11-11 17:25:12 +1100172 return;
173 }
174
Ishizaki Kou7cfb62a2008-04-24 19:21:10 +1000175 bus = &iowa_busses[iowa_bus_count];
176 bus->phb = phb;
177 bus->ops = ops;
Benjamin Herrenschmidt014da7f2006-11-11 17:25:12 +1100178
Ishizaki Kou7cfb62a2008-04-24 19:21:10 +1000179 if (initfunc)
180 if ((*initfunc)(bus, data))
181 return;
Benjamin Herrenschmidt014da7f2006-11-11 17:25:12 +1100182
Ishizaki Kou7cfb62a2008-04-24 19:21:10 +1000183 iowa_bus_count++;
Benjamin Herrenschmidt014da7f2006-11-11 17:25:12 +1100184
Ishizaki Kou7cfb62a2008-04-24 19:21:10 +1000185 pr_debug("IOWA:[%d]Add bus, %s.\n", iowa_bus_count-1, np->full_name);
Benjamin Herrenschmidt014da7f2006-11-11 17:25:12 +1100186}
187