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11
12#undef DEBUG
13
14#include <linux/kernel.h>
15#include <linux/sched.h>
16
17#include <asm/io.h>
18#include <asm/machdep.h>
19#include <asm/pgtable.h>
20#include <asm/ppc-pci.h>
21#include <asm/io-workarounds.h>
22
23#define IOWA_MAX_BUS 8
24
25static struct iowa_bus iowa_busses[IOWA_MAX_BUS];
26static unsigned int iowa_bus_count;
27
28static 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;
33
34 for (i = 0; i < iowa_bus_count; i++) {
35 struct iowa_bus *bus = &iowa_busses[i];
36 struct pci_controller *phb = bus->phb;
37
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 }
51 }
52
53 return NULL;
54}
55
56#ifdef CONFIG_PPC_INDIRECT_MMIO
57struct iowa_bus *iowa_mem_find_bus(const PCI_IO_ADDR addr)
58{
59 unsigned hugepage_shift;
60 struct iowa_bus *bus;
61 int token;
62
63 token = PCI_GET_ADDR_TOKEN(addr);
64
65 if (token && token <= iowa_bus_count)
66 bus = &iowa_busses[token - 1];
67 else {
68 unsigned long vaddr, paddr;
69 pte_t *ptep;
70
71 vaddr = (unsigned long)PCI_FIX_ADDR(addr);
72 if (vaddr < PHB_IO_BASE || vaddr >= PHB_IO_END)
73 return NULL;
74
75
76
77
78 ptep = __find_linux_pte_or_hugepte(init_mm.pgd, vaddr,
79 NULL, &hugepage_shift);
80 if (ptep == NULL)
81 paddr = 0;
82 else {
83 WARN_ON(hugepage_shift);
84 paddr = pte_pfn(*ptep) << PAGE_SHIFT;
85 }
86 bus = iowa_pci_find(vaddr, paddr);
87
88 if (bus == NULL)
89 return NULL;
90 }
91
92 return bus;
93}
94#else
95struct iowa_bus *iowa_mem_find_bus(const PCI_IO_ADDR addr)
96{
97 return NULL;
98}
99#endif
100
101#ifdef CONFIG_PPC_INDIRECT_PIO
102struct iowa_bus *iowa_pio_find_bus(unsigned long port)
103{
104 unsigned long vaddr = (unsigned long)pci_io_base + port;
105 return iowa_pci_find(vaddr, 0);
106}
107#else
108struct iowa_bus *iowa_pio_find_bus(unsigned long port)
109{
110 return NULL;
111}
112#endif
113
114#define DEF_PCI_AC_RET(name, ret, at, al, space, aa) \
115static ret iowa_##name at \
116{ \
117 struct iowa_bus *bus; \
118 bus = iowa_##space##_find_bus(aa); \
119 if (bus && bus->ops && bus->ops->name) \
120 return bus->ops->name al; \
121 return __do_##name al; \
122}
123
124#define DEF_PCI_AC_NORET(name, at, al, space, aa) \
125static void iowa_##name at \
126{ \
127 struct iowa_bus *bus; \
128 bus = iowa_##space##_find_bus(aa); \
129 if (bus && bus->ops && bus->ops->name) { \
130 bus->ops->name al; \
131 return; \
132 } \
133 __do_##name al; \
134}
135
136#include <asm/io-defs.h>
137
138#undef DEF_PCI_AC_RET
139#undef DEF_PCI_AC_NORET
140
141static const struct ppc_pci_io iowa_pci_io = {
142
143#define DEF_PCI_AC_RET(name, ret, at, al, space, aa) .name = iowa_##name,
144#define DEF_PCI_AC_NORET(name, at, al, space, aa) .name = iowa_##name,
145
146#include <asm/io-defs.h>
147
148#undef DEF_PCI_AC_RET
149#undef DEF_PCI_AC_NORET
150
151};
152
153#ifdef CONFIG_PPC_INDIRECT_MMIO
154static void __iomem *iowa_ioremap(phys_addr_t addr, unsigned long size,
155 unsigned long flags, void *caller)
156{
157 struct iowa_bus *bus;
158 void __iomem *res = __ioremap_caller(addr, size, flags, caller);
159 int busno;
160
161 bus = iowa_pci_find(0, (unsigned long)addr);
162 if (bus != NULL) {
163 busno = bus - iowa_busses;
164 PCI_SET_ADDR_TOKEN(res, busno + 1);
165 }
166 return res;
167}
168#else
169#define iowa_ioremap NULL
170#endif
171
172
173static void io_workaround_init(void)
174{
175 static int io_workaround_inited;
176
177 if (io_workaround_inited)
178 return;
179 ppc_pci_io = iowa_pci_io;
180 ppc_md.ioremap = iowa_ioremap;
181 io_workaround_inited = 1;
182}
183
184
185void iowa_register_bus(struct pci_controller *phb, struct ppc_pci_io *ops,
186 int (*initfunc)(struct iowa_bus *, void *), void *data)
187{
188 struct iowa_bus *bus;
189 struct device_node *np = phb->dn;
190
191 io_workaround_init();
192
193 if (iowa_bus_count >= IOWA_MAX_BUS) {
194 pr_err("IOWA:Too many pci bridges, "
195 "workarounds disabled for %s\n", np->full_name);
196 return;
197 }
198
199 bus = &iowa_busses[iowa_bus_count];
200 bus->phb = phb;
201 bus->ops = ops;
202 bus->private = data;
203
204 if (initfunc)
205 if ((*initfunc)(bus, data))
206 return;
207
208 iowa_bus_count++;
209
210 pr_debug("IOWA:[%d]Add bus, %s.\n", iowa_bus_count-1, np->full_name);
211}
212
213
