Merge branch 'locks' of git://linux-nfs.org/~bfields/linux
[linux-2.6] / arch / powerpc / platforms / celleb / io-workarounds.c
1 /*
2  * Support for Celleb io workarounds
3  *
4  * (C) Copyright 2006-2007 TOSHIBA CORPORATION
5  *
6  * This file is based to arch/powerpc/platform/cell/io-workarounds.c
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 as published by
10  * the Free Software Foundation; either version 2 of the License, or
11  * (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License along
19  * with this program; if not, write to the Free Software Foundation, Inc.,
20  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
21  */
22
23 #undef DEBUG
24
25 #include <linux/of_device.h>
26 #include <linux/irq.h>
27
28 #include <asm/io.h>
29 #include <asm/prom.h>
30 #include <asm/machdep.h>
31 #include <asm/pci-bridge.h>
32 #include <asm/ppc-pci.h>
33
34 #include "pci.h"
35
36 #define MAX_CELLEB_PCI_BUS      4
37
38 void *celleb_dummy_page_va;
39
40 static struct celleb_pci_bus {
41         struct pci_controller *phb;
42         void (*dummy_read)(struct pci_controller *);
43 } celleb_pci_busses[MAX_CELLEB_PCI_BUS];
44
45 static int celleb_pci_count = 0;
46
47 static struct celleb_pci_bus *celleb_pci_find(unsigned long vaddr,
48                                               unsigned long paddr)
49 {
50         int i, j;
51         struct resource *res;
52
53         for (i = 0; i < celleb_pci_count; i++) {
54                 struct celleb_pci_bus *bus = &celleb_pci_busses[i];
55                 struct pci_controller *phb = bus->phb;
56                 if (paddr)
57                         for (j = 0; j < 3; j++) {
58                                 res = &phb->mem_resources[j];
59                                 if (paddr >= res->start && paddr <= res->end)
60                                         return bus;
61                         }
62                 res = &phb->io_resource;
63                 if (vaddr && vaddr >= res->start && vaddr <= res->end)
64                         return bus;
65         }
66         return NULL;
67 }
68
69 static void celleb_io_flush(const PCI_IO_ADDR addr)
70 {
71         struct celleb_pci_bus *bus;
72         int token;
73
74         token = PCI_GET_ADDR_TOKEN(addr);
75
76         if (token && token <= celleb_pci_count)
77                 bus = &celleb_pci_busses[token - 1];
78         else {
79                 unsigned long vaddr, paddr;
80                 pte_t *ptep;
81
82                 vaddr = (unsigned long)PCI_FIX_ADDR(addr);
83                 if (vaddr < PHB_IO_BASE || vaddr >= PHB_IO_END)
84                         return;
85
86                 ptep = find_linux_pte(init_mm.pgd, vaddr);
87                 if (ptep == NULL)
88                         paddr = 0;
89                 else
90                         paddr = pte_pfn(*ptep) << PAGE_SHIFT;
91                 bus = celleb_pci_find(vaddr, paddr);
92
93                 if (bus == NULL)
94                         return;
95         }
96
97         if (bus->dummy_read)
98                 bus->dummy_read(bus->phb);
99 }
100
101 static u8 celleb_readb(const PCI_IO_ADDR addr)
102 {
103         u8 val;
104         val = __do_readb(addr);
105         celleb_io_flush(addr);
106         return val;
107 }
108
109 static u16 celleb_readw(const PCI_IO_ADDR addr)
110 {
111         u16 val;
112         val = __do_readw(addr);
113         celleb_io_flush(addr);
114         return val;
115 }
116
117 static u32 celleb_readl(const PCI_IO_ADDR addr)
118 {
119         u32 val;
120         val = __do_readl(addr);
121         celleb_io_flush(addr);
122         return val;
123 }
124
125 static u64 celleb_readq(const PCI_IO_ADDR addr)
126 {
127         u64 val;
128         val = __do_readq(addr);
129         celleb_io_flush(addr);
130         return val;
131 }
132
133 static u16 celleb_readw_be(const PCI_IO_ADDR addr)
134 {
135         u16 val;
136         val = __do_readw_be(addr);
137         celleb_io_flush(addr);
138         return val;
139 }
140
141 static u32 celleb_readl_be(const PCI_IO_ADDR addr)
142 {
143         u32 val;
144         val = __do_readl_be(addr);
145         celleb_io_flush(addr);
146         return val;
147 }
148
149 static u64 celleb_readq_be(const PCI_IO_ADDR addr)
150 {
151         u64 val;
152         val = __do_readq_be(addr);
153         celleb_io_flush(addr);
154         return val;
155 }
156
157 static void celleb_readsb(const PCI_IO_ADDR addr,
158                           void *buf, unsigned long count)
159 {
160         __do_readsb(addr, buf, count);
161         celleb_io_flush(addr);
162 }
163
164 static void celleb_readsw(const PCI_IO_ADDR addr,
165                           void *buf, unsigned long count)
166 {
167         __do_readsw(addr, buf, count);
168         celleb_io_flush(addr);
169 }
170
171 static void celleb_readsl(const PCI_IO_ADDR addr,
172                           void *buf, unsigned long count)
173 {
174         __do_readsl(addr, buf, count);
175         celleb_io_flush(addr);
176 }
177
178 static void celleb_memcpy_fromio(void *dest,
179                                  const PCI_IO_ADDR src,
180                                  unsigned long n)
181 {
182         __do_memcpy_fromio(dest, src, n);
183         celleb_io_flush(src);
184 }
185
186 static void __iomem *celleb_ioremap(unsigned long addr,
187                                      unsigned long size,
188                                      unsigned long flags)
189 {
190         struct celleb_pci_bus *bus;
191         void __iomem *res = __ioremap(addr, size, flags);
192         int busno;
193
194         bus = celleb_pci_find(0, addr);
195         if (bus != NULL) {
196                 busno = bus - celleb_pci_busses;
197                 PCI_SET_ADDR_TOKEN(res, busno + 1);
198         }
199         return res;
200 }
201
202 static void celleb_iounmap(volatile void __iomem *addr)
203 {
204         return __iounmap(PCI_FIX_ADDR(addr));
205 }
206
207 static struct ppc_pci_io celleb_pci_io __initdata = {
208         .readb = celleb_readb,
209         .readw = celleb_readw,
210         .readl = celleb_readl,
211         .readq = celleb_readq,
212         .readw_be = celleb_readw_be,
213         .readl_be = celleb_readl_be,
214         .readq_be = celleb_readq_be,
215         .readsb = celleb_readsb,
216         .readsw = celleb_readsw,
217         .readsl = celleb_readsl,
218         .memcpy_fromio = celleb_memcpy_fromio,
219 };
220
221 void __init celleb_pci_add_one(struct pci_controller *phb,
222                                void (*dummy_read)(struct pci_controller *))
223 {
224         struct celleb_pci_bus *bus = &celleb_pci_busses[celleb_pci_count];
225         struct device_node *np = phb->arch_data;
226
227         if (celleb_pci_count >= MAX_CELLEB_PCI_BUS) {
228                 printk(KERN_ERR "Too many pci bridges, workarounds"
229                        " disabled for %s\n", np->full_name);
230                 return;
231         }
232
233         celleb_pci_count++;
234
235         bus->phb = phb;
236         bus->dummy_read = dummy_read;
237 }
238
239 static struct of_device_id celleb_pci_workaround_match[] __initdata = {
240         {
241                 .name = "pci-pseudo",
242                 .data = fake_pci_workaround_init,
243         }, {
244                 .name = "epci",
245                 .data = epci_workaround_init,
246         }, {
247         },
248 };
249
250 int __init celleb_pci_workaround_init(void)
251 {
252         struct pci_controller *phb;
253         struct device_node *node;
254         const struct  of_device_id *match;
255         void (*init_func)(struct pci_controller *);
256
257         celleb_dummy_page_va = kmalloc(PAGE_SIZE, GFP_KERNEL);
258         if (!celleb_dummy_page_va) {
259                 printk(KERN_ERR "Celleb: dummy read disabled."
260                         "Alloc celleb_dummy_page_va failed\n");
261                 return 1;
262         }
263
264         list_for_each_entry(phb, &hose_list, list_node) {
265                 node = phb->arch_data;
266                 match = of_match_node(celleb_pci_workaround_match, node);
267
268                 if (match) {
269                         init_func = match->data;
270                         (*init_func)(phb);
271                 }
272         }
273
274         ppc_pci_io = celleb_pci_io;
275         ppc_md.ioremap = celleb_ioremap;
276         ppc_md.iounmap = celleb_iounmap;
277
278         return 0;
279 }