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git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - arch/powerpc/kernel/io-workarounds.c
2 * Support PCI IO workaround
4 * Copyright (C) 2006 Benjamin Herrenschmidt <benh@kernel.crashing.org>
6 * (C) Copyright 2007-2008 TOSHIBA CORPORATION
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.
14 #include <linux/kernel.h>
15 #include <linux/sched.h> /* for init_mm */
18 #include <asm/machdep.h>
19 #include <asm/pgtable.h>
20 #include <asm/ppc-pci.h>
21 #include <asm/io-workarounds.h>
23 #define IOWA_MAX_BUS 8
25 static struct iowa_bus iowa_busses
[IOWA_MAX_BUS
];
26 static unsigned int iowa_bus_count
;
28 static struct iowa_bus
*iowa_pci_find(unsigned long vaddr
, unsigned long paddr
)
32 unsigned long vstart
, vend
;
34 for (i
= 0; i
< iowa_bus_count
; i
++) {
35 struct iowa_bus
*bus
= &iowa_busses
[i
];
36 struct pci_controller
*phb
= bus
->phb
;
39 vstart
= (unsigned long)phb
->io_base_virt
;
40 vend
= vstart
+ phb
->pci_io_size
- 1;
41 if ((vaddr
>= vstart
) && (vaddr
<= vend
))
46 for (j
= 0; j
< 3; j
++) {
47 res
= &phb
->mem_resources
[j
];
48 if (paddr
>= res
->start
&& paddr
<= res
->end
)
56 #ifdef CONFIG_PPC_INDIRECT_MMIO
57 struct iowa_bus
*iowa_mem_find_bus(const PCI_IO_ADDR addr
)
59 unsigned hugepage_shift
;
63 token
= PCI_GET_ADDR_TOKEN(addr
);
65 if (token
&& token
<= iowa_bus_count
)
66 bus
= &iowa_busses
[token
- 1];
68 unsigned long vaddr
, paddr
;
71 vaddr
= (unsigned long)PCI_FIX_ADDR(addr
);
72 if (vaddr
< PHB_IO_BASE
|| vaddr
>= PHB_IO_END
)
75 ptep
= find_linux_pte_or_hugepte(init_mm
.pgd
, vaddr
,
81 * we don't have hugepages backing iomem
83 WARN_ON(hugepage_shift
);
84 paddr
= pte_pfn(*ptep
) << PAGE_SHIFT
;
86 bus
= iowa_pci_find(vaddr
, paddr
);
94 #else /* CONFIG_PPC_INDIRECT_MMIO */
95 struct iowa_bus
*iowa_mem_find_bus(const PCI_IO_ADDR addr
)
99 #endif /* !CONFIG_PPC_INDIRECT_MMIO */
101 #ifdef CONFIG_PPC_INDIRECT_PIO
102 struct iowa_bus
*iowa_pio_find_bus(unsigned long port
)
104 unsigned long vaddr
= (unsigned long)pci_io_base
+ port
;
105 return iowa_pci_find(vaddr
, 0);
108 struct iowa_bus
*iowa_pio_find_bus(unsigned long port
)
114 #define DEF_PCI_AC_RET(name, ret, at, al, space, aa) \
115 static ret iowa_##name at \
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; \
124 #define DEF_PCI_AC_NORET(name, at, al, space, aa) \
125 static void iowa_##name at \
127 struct iowa_bus *bus; \
128 bus = iowa_##space##_find_bus(aa); \
129 if (bus && bus->ops && bus->ops->name) { \
136 #include <asm/io-defs.h>
138 #undef DEF_PCI_AC_RET
139 #undef DEF_PCI_AC_NORET
141 static const struct ppc_pci_io iowa_pci_io
= {
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,
146 #include <asm/io-defs.h>
148 #undef DEF_PCI_AC_RET
149 #undef DEF_PCI_AC_NORET
153 #ifdef CONFIG_PPC_INDIRECT_MMIO
154 static void __iomem
*iowa_ioremap(phys_addr_t addr
, unsigned long size
,
155 unsigned long flags
, void *caller
)
157 struct iowa_bus
*bus
;
158 void __iomem
*res
= __ioremap_caller(addr
, size
, flags
, caller
);
161 bus
= iowa_pci_find(0, (unsigned long)addr
);
163 busno
= bus
- iowa_busses
;
164 PCI_SET_ADDR_TOKEN(res
, busno
+ 1);
168 #else /* CONFIG_PPC_INDIRECT_MMIO */
169 #define iowa_ioremap NULL
170 #endif /* !CONFIG_PPC_INDIRECT_MMIO */
172 /* Enable IO workaround */
173 static void io_workaround_init(void)
175 static int io_workaround_inited
;
177 if (io_workaround_inited
)
179 ppc_pci_io
= iowa_pci_io
;
180 ppc_md
.ioremap
= iowa_ioremap
;
181 io_workaround_inited
= 1;
184 /* Register new bus to support workaround */
185 void iowa_register_bus(struct pci_controller
*phb
, struct ppc_pci_io
*ops
,
186 int (*initfunc
)(struct iowa_bus
*, void *), void *data
)
188 struct iowa_bus
*bus
;
189 struct device_node
*np
= phb
->dn
;
191 io_workaround_init();
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
);
199 bus
= &iowa_busses
[iowa_bus_count
];
205 if ((*initfunc
)(bus
, data
))
210 pr_debug("IOWA:[%d]Add bus, %s.\n", iowa_bus_count
-1, np
->full_name
);