Commit | Line | Data |
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014da7ff | 1 | /* |
7cfb62a2 IK |
2 | * Support PCI IO workaround |
3 | * | |
014da7ff BH |
4 | * Copyright (C) 2006 Benjamin Herrenschmidt <benh@kernel.crashing.org> |
5 | * IBM, Corp. | |
7cfb62a2 | 6 | * (C) Copyright 2007-2008 TOSHIBA CORPORATION |
014da7ff BH |
7 | * |
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> | |
333a1518 | 15 | #include <linux/sched.h> /* for init_mm */ |
7cfb62a2 | 16 | |
014da7ff BH |
17 | #include <asm/io.h> |
18 | #include <asm/machdep.h> | |
7cfb62a2 | 19 | #include <asm/pgtable.h> |
014da7ff | 20 | #include <asm/ppc-pci.h> |
3cc30d07 | 21 | #include <asm/io-workarounds.h> |
014da7ff | 22 | |
7cfb62a2 | 23 | #define IOWA_MAX_BUS 8 |
014da7ff | 24 | |
7cfb62a2 IK |
25 | static struct iowa_bus iowa_busses[IOWA_MAX_BUS]; |
26 | static unsigned int iowa_bus_count; | |
014da7ff | 27 | |
7cfb62a2 IK |
28 | static struct iowa_bus *iowa_pci_find(unsigned long vaddr, unsigned long paddr) |
29 | { | |
30 | int i, j; | |
31 | struct resource *res; | |
32 | unsigned long vstart, vend; | |
014da7ff | 33 | |
7cfb62a2 IK |
34 | for (i = 0; i < iowa_bus_count; i++) { |
35 | struct iowa_bus *bus = &iowa_busses[i]; | |
36 | struct pci_controller *phb = bus->phb; | |
014da7ff | 37 | |
7cfb62a2 IK |
38 | if (vaddr) { |
39 | vstart = (unsigned long)phb->io_base_virt; | |
40 | vend = vstart + phb->pci_io_size - 1; | |
41 | if ((vaddr >= vstart) && (vaddr <= vend)) | |
42 | return bus; | |
43 | } | |
44 | ||
45 | if (paddr) | |
46 | for (j = 0; j < 3; j++) { | |
47 | res = &phb->mem_resources[j]; | |
48 | if (paddr >= res->start && paddr <= res->end) | |
49 | return bus; | |
50 | } | |
014da7ff | 51 | } |
7cfb62a2 | 52 | |
014da7ff BH |
53 | return NULL; |
54 | } | |
55 | ||
7cfb62a2 | 56 | struct iowa_bus *iowa_mem_find_bus(const PCI_IO_ADDR addr) |
014da7ff | 57 | { |
12bc9f6f | 58 | unsigned hugepage_shift; |
7cfb62a2 | 59 | struct iowa_bus *bus; |
014da7ff BH |
60 | int token; |
61 | ||
014da7ff BH |
62 | token = PCI_GET_ADDR_TOKEN(addr); |
63 | ||
7cfb62a2 IK |
64 | if (token && token <= iowa_bus_count) |
65 | bus = &iowa_busses[token - 1]; | |
014da7ff BH |
66 | else { |
67 | unsigned long vaddr, paddr; | |
68 | pte_t *ptep; | |
69 | ||
014da7ff | 70 | vaddr = (unsigned long)PCI_FIX_ADDR(addr); |
7cfb62a2 IK |
71 | if (vaddr < PHB_IO_BASE || vaddr >= PHB_IO_END) |
72 | return NULL; | |
014da7ff | 73 | |
12bc9f6f AK |
74 | ptep = find_linux_pte_or_hugepte(init_mm.pgd, vaddr, |
75 | &hugepage_shift); | |
014da7ff BH |
76 | if (ptep == NULL) |
77 | paddr = 0; | |
12bc9f6f AK |
78 | else { |
79 | /* | |
80 | * we don't have hugepages backing iomem | |
81 | */ | |
82 | WARN_ON(hugepage_shift); | |
014da7ff | 83 | paddr = pte_pfn(*ptep) << PAGE_SHIFT; |
12bc9f6f | 84 | } |
7cfb62a2 | 85 | bus = iowa_pci_find(vaddr, paddr); |
014da7ff | 86 | |
014da7ff | 87 | if (bus == NULL) |
7cfb62a2 | 88 | return NULL; |
014da7ff BH |
89 | } |
90 | ||
7cfb62a2 | 91 | return bus; |
014da7ff BH |
92 | } |
93 | ||
7cfb62a2 | 94 | struct iowa_bus *iowa_pio_find_bus(unsigned long port) |
014da7ff | 95 | { |
7cfb62a2 IK |
96 | unsigned long vaddr = (unsigned long)pci_io_base + port; |
97 | return iowa_pci_find(vaddr, 0); | |
014da7ff BH |
98 | } |
99 | ||
014da7ff | 100 | |
7cfb62a2 IK |
101 | #define DEF_PCI_AC_RET(name, ret, at, al, space, aa) \ |
102 | static ret iowa_##name at \ | |
103 | { \ | |
104 | struct iowa_bus *bus; \ | |
105 | bus = iowa_##space##_find_bus(aa); \ | |
106 | if (bus && bus->ops && bus->ops->name) \ | |
107 | return bus->ops->name al; \ | |
108 | return __do_##name al; \ | |
014da7ff BH |
109 | } |
110 | ||
7cfb62a2 IK |
111 | #define DEF_PCI_AC_NORET(name, at, al, space, aa) \ |
112 | static void iowa_##name at \ | |
113 | { \ | |
114 | struct iowa_bus *bus; \ | |
115 | bus = iowa_##space##_find_bus(aa); \ | |
116 | if (bus && bus->ops && bus->ops->name) { \ | |
117 | bus->ops->name al; \ | |
118 | return; \ | |
119 | } \ | |
120 | __do_##name al; \ | |
014da7ff BH |
121 | } |
122 | ||
7cfb62a2 | 123 | #include <asm/io-defs.h> |
014da7ff | 124 | |
7cfb62a2 IK |
125 | #undef DEF_PCI_AC_RET |
126 | #undef DEF_PCI_AC_NORET | |
014da7ff | 127 | |
cad5cef6 | 128 | static const struct ppc_pci_io iowa_pci_io = { |
014da7ff | 129 | |
7cfb62a2 IK |
130 | #define DEF_PCI_AC_RET(name, ret, at, al, space, aa) .name = iowa_##name, |
131 | #define DEF_PCI_AC_NORET(name, at, al, space, aa) .name = iowa_##name, | |
014da7ff | 132 | |
7cfb62a2 | 133 | #include <asm/io-defs.h> |
014da7ff | 134 | |
7cfb62a2 IK |
135 | #undef DEF_PCI_AC_RET |
136 | #undef DEF_PCI_AC_NORET | |
014da7ff | 137 | |
7cfb62a2 | 138 | }; |
014da7ff | 139 | |
b36ac9e8 | 140 | static void __iomem *iowa_ioremap(phys_addr_t addr, unsigned long size, |
1cdab55d | 141 | unsigned long flags, void *caller) |
014da7ff | 142 | { |
7cfb62a2 | 143 | struct iowa_bus *bus; |
1cdab55d | 144 | void __iomem *res = __ioremap_caller(addr, size, flags, caller); |
014da7ff BH |
145 | int busno; |
146 | ||
b36ac9e8 | 147 | bus = iowa_pci_find(0, (unsigned long)addr); |
014da7ff | 148 | if (bus != NULL) { |
7cfb62a2 | 149 | busno = bus - iowa_busses; |
014da7ff BH |
150 | PCI_SET_ADDR_TOKEN(res, busno + 1); |
151 | } | |
014da7ff BH |
152 | return res; |
153 | } | |
154 | ||
d1109b75 | 155 | /* Enable IO workaround */ |
cad5cef6 | 156 | static void io_workaround_init(void) |
d1109b75 ME |
157 | { |
158 | static int io_workaround_inited; | |
159 | ||
160 | if (io_workaround_inited) | |
161 | return; | |
162 | ppc_pci_io = iowa_pci_io; | |
163 | ppc_md.ioremap = iowa_ioremap; | |
164 | io_workaround_inited = 1; | |
165 | } | |
166 | ||
167 | /* Register new bus to support workaround */ | |
cad5cef6 GKH |
168 | void iowa_register_bus(struct pci_controller *phb, struct ppc_pci_io *ops, |
169 | int (*initfunc)(struct iowa_bus *, void *), void *data) | |
014da7ff | 170 | { |
7cfb62a2 | 171 | struct iowa_bus *bus; |
44ef3390 | 172 | struct device_node *np = phb->dn; |
014da7ff | 173 | |
d1109b75 ME |
174 | io_workaround_init(); |
175 | ||
7cfb62a2 IK |
176 | if (iowa_bus_count >= IOWA_MAX_BUS) { |
177 | pr_err("IOWA:Too many pci bridges, " | |
178 | "workarounds disabled for %s\n", np->full_name); | |
014da7ff BH |
179 | return; |
180 | } | |
181 | ||
7cfb62a2 IK |
182 | bus = &iowa_busses[iowa_bus_count]; |
183 | bus->phb = phb; | |
184 | bus->ops = ops; | |
69b12368 | 185 | bus->private = data; |
014da7ff | 186 | |
7cfb62a2 IK |
187 | if (initfunc) |
188 | if ((*initfunc)(bus, data)) | |
189 | return; | |
014da7ff | 190 | |
7cfb62a2 | 191 | iowa_bus_count++; |
014da7ff | 192 | |
7cfb62a2 | 193 | pr_debug("IOWA:[%d]Add bus, %s.\n", iowa_bus_count-1, np->full_name); |
014da7ff BH |
194 | } |
195 |