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ARM: mmp: fix potential NULL dereference
[linux/fpc-iii.git] / arch / x86 / pci / ce4100.c
blob41bd2a2d2c50f61a4948f954f296631c8dfd7961
1 /*
2 * GPL LICENSE SUMMARY
3 *
4 * Copyright(c) 2010 Intel Corporation. All rights reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of version 2 of the GNU General Public License as
8 * published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
18 * The full GNU General Public License is included in this distribution
19 * in the file called LICENSE.GPL.
20 *
21 * Contact Information:
22 * Intel Corporation
23 * 2200 Mission College Blvd.
24 * Santa Clara, CA 97052
25 *
26 * This provides access methods for PCI registers that mis-behave on
27 * the CE4100. Each register can be assigned a private init, read and
28 * write routine. The exception to this is the bridge device. The
29 * bridge device is the only device on bus zero (0) that requires any
30 * fixup so it is a special case ATM
31 */
32
33 #include <linux/kernel.h>
34 #include <linux/pci.h>
35 #include <linux/init.h>
36
37 #include <asm/ce4100.h>
38 #include <asm/pci_x86.h>
39
40 struct sim_reg {
41 u32 value;
42 u32 mask;
43 };
44
45 struct sim_dev_reg {
46 int dev_func;
47 int reg;
48 void (*init)(struct sim_dev_reg *reg);
49 void (*read)(struct sim_dev_reg *reg, u32 *value);
50 void (*write)(struct sim_dev_reg *reg, u32 value);
51 struct sim_reg sim_reg;
52 };
53
54 struct sim_reg_op {
55 void (*init)(struct sim_dev_reg *reg);
56 void (*read)(struct sim_dev_reg *reg, u32 value);
57 void (*write)(struct sim_dev_reg *reg, u32 value);
58 };
59
60 #define MB (1024 * 1024)
61 #define KB (1024)
62 #define SIZE_TO_MASK(size) (~(size - 1))
63
64 #define DEFINE_REG(device, func, offset, size, init_op, read_op, write_op)\
65 { PCI_DEVFN(device, func), offset, init_op, read_op, write_op,\
66 {0, SIZE_TO_MASK(size)} },
67
68 static void reg_init(struct sim_dev_reg *reg)
69 {
70 pci_direct_conf1.read(0, 1, reg->dev_func, reg->reg, 4,
71 &reg->sim_reg.value);
72 }
73
74 static void reg_read(struct sim_dev_reg *reg, u32 *value)
75 {
76 unsigned long flags;
77
78 raw_spin_lock_irqsave(&pci_config_lock, flags);
79 *value = reg->sim_reg.value;
80 raw_spin_unlock_irqrestore(&pci_config_lock, flags);
81 }
82
83 static void reg_write(struct sim_dev_reg *reg, u32 value)
84 {
85 unsigned long flags;
86
87 raw_spin_lock_irqsave(&pci_config_lock, flags);
88 reg->sim_reg.value = (value & reg->sim_reg.mask) |
89 (reg->sim_reg.value & ~reg->sim_reg.mask);
90 raw_spin_unlock_irqrestore(&pci_config_lock, flags);
91 }
92
93 static void sata_reg_init(struct sim_dev_reg *reg)
94 {
95 pci_direct_conf1.read(0, 1, PCI_DEVFN(14, 0), 0x10, 4,
96 &reg->sim_reg.value);
97 reg->sim_reg.value += 0x400;
98 }
99
100 static void ehci_reg_read(struct sim_dev_reg *reg, u32 *value)
101 {
102 reg_read(reg, value);
103 if (*value != reg->sim_reg.mask)
104 *value |= 0x100;
105 }
106
107 void sata_revid_init(struct sim_dev_reg *reg)
108 {
109 reg->sim_reg.value = 0x01060100;
110 reg->sim_reg.mask = 0;
111 }
112
113 static void sata_revid_read(struct sim_dev_reg *reg, u32 *value)
114 {
115 reg_read(reg, value);
116 }
117
118 static struct sim_dev_reg bus1_fixups[] = {
119 DEFINE_REG(2, 0, 0x10, (16*MB), reg_init, reg_read, reg_write)
120 DEFINE_REG(2, 0, 0x14, (256), reg_init, reg_read, reg_write)
121 DEFINE_REG(2, 1, 0x10, (64*KB), reg_init, reg_read, reg_write)
122 DEFINE_REG(3, 0, 0x10, (64*KB), reg_init, reg_read, reg_write)
123 DEFINE_REG(4, 0, 0x10, (128*KB), reg_init, reg_read, reg_write)
124 DEFINE_REG(4, 1, 0x10, (128*KB), reg_init, reg_read, reg_write)
125 DEFINE_REG(6, 0, 0x10, (512*KB), reg_init, reg_read, reg_write)
126 DEFINE_REG(6, 1, 0x10, (512*KB), reg_init, reg_read, reg_write)
127 DEFINE_REG(6, 2, 0x10, (64*KB), reg_init, reg_read, reg_write)
128 DEFINE_REG(8, 0, 0x10, (1*MB), reg_init, reg_read, reg_write)
129 DEFINE_REG(8, 1, 0x10, (64*KB), reg_init, reg_read, reg_write)
130 DEFINE_REG(8, 2, 0x10, (64*KB), reg_init, reg_read, reg_write)
131 DEFINE_REG(9, 0, 0x10 , (1*MB), reg_init, reg_read, reg_write)
132 DEFINE_REG(9, 0, 0x14, (64*KB), reg_init, reg_read, reg_write)
133 DEFINE_REG(10, 0, 0x10, (256), reg_init, reg_read, reg_write)
134 DEFINE_REG(10, 0, 0x14, (256*MB), reg_init, reg_read, reg_write)
135 DEFINE_REG(11, 0, 0x10, (256), reg_init, reg_read, reg_write)
136 DEFINE_REG(11, 0, 0x14, (256), reg_init, reg_read, reg_write)
137 DEFINE_REG(11, 1, 0x10, (256), reg_init, reg_read, reg_write)
138 DEFINE_REG(11, 2, 0x10, (256), reg_init, reg_read, reg_write)
139 DEFINE_REG(11, 2, 0x14, (256), reg_init, reg_read, reg_write)
140 DEFINE_REG(11, 2, 0x18, (256), reg_init, reg_read, reg_write)
141 DEFINE_REG(11, 3, 0x10, (256), reg_init, reg_read, reg_write)
142 DEFINE_REG(11, 3, 0x14, (256), reg_init, reg_read, reg_write)
143 DEFINE_REG(11, 4, 0x10, (256), reg_init, reg_read, reg_write)
144 DEFINE_REG(11, 5, 0x10, (64*KB), reg_init, reg_read, reg_write)
145 DEFINE_REG(11, 6, 0x10, (256), reg_init, reg_read, reg_write)
146 DEFINE_REG(11, 7, 0x10, (64*KB), reg_init, reg_read, reg_write)
147 DEFINE_REG(12, 0, 0x10, (128*KB), reg_init, reg_read, reg_write)
148 DEFINE_REG(12, 0, 0x14, (256), reg_init, reg_read, reg_write)
149 DEFINE_REG(12, 1, 0x10, (1024), reg_init, reg_read, reg_write)
150 DEFINE_REG(13, 0, 0x10, (32*KB), reg_init, ehci_reg_read, reg_write)
151 DEFINE_REG(13, 1, 0x10, (32*KB), reg_init, ehci_reg_read, reg_write)
152 DEFINE_REG(14, 0, 0x8, 0, sata_revid_init, sata_revid_read, 0)
153 DEFINE_REG(14, 0, 0x10, 0, reg_init, reg_read, reg_write)
154 DEFINE_REG(14, 0, 0x14, 0, reg_init, reg_read, reg_write)
155 DEFINE_REG(14, 0, 0x18, 0, reg_init, reg_read, reg_write)
156 DEFINE_REG(14, 0, 0x1C, 0, reg_init, reg_read, reg_write)
157 DEFINE_REG(14, 0, 0x20, 0, reg_init, reg_read, reg_write)
158 DEFINE_REG(14, 0, 0x24, (0x200), sata_reg_init, reg_read, reg_write)
159 DEFINE_REG(15, 0, 0x10, (64*KB), reg_init, reg_read, reg_write)
160 DEFINE_REG(15, 0, 0x14, (64*KB), reg_init, reg_read, reg_write)
161 DEFINE_REG(16, 0, 0x10, (64*KB), reg_init, reg_read, reg_write)
162 DEFINE_REG(16, 0, 0x14, (64*MB), reg_init, reg_read, reg_write)
163 DEFINE_REG(16, 0, 0x18, (64*MB), reg_init, reg_read, reg_write)
164 DEFINE_REG(17, 0, 0x10, (128*KB), reg_init, reg_read, reg_write)
165 DEFINE_REG(18, 0, 0x10, (1*KB), reg_init, reg_read, reg_write)
166 };
167
168 static void __init init_sim_regs(void)
169 {
170 int i;
171
172 for (i = 0; i < ARRAY_SIZE(bus1_fixups); i++) {
173 if (bus1_fixups[i].init)
174 bus1_fixups[i].init(&bus1_fixups[i]);
175 }
176 }
177
178 static inline void extract_bytes(u32 *value, int reg, int len)
179 {
180 uint32_t mask;
181
182 *value >>= ((reg & 3) * 8);
183 mask = 0xFFFFFFFF >> ((4 - len) * 8);
184 *value &= mask;
185 }
186
187 int bridge_read(unsigned int devfn, int reg, int len, u32 *value)
188 {
189 u32 av_bridge_base, av_bridge_limit;
190 int retval = 0;
191
192 switch (reg) {
193 /* Make BARs appear to not request any memory. */
194 case PCI_BASE_ADDRESS_0:
195 case PCI_BASE_ADDRESS_0 + 1:
196 case PCI_BASE_ADDRESS_0 + 2:
197 case PCI_BASE_ADDRESS_0 + 3:
198 *value = 0;
199 break;
200
201 /* Since subordinate bus number register is hardwired
202 * to zero and read only, so do the simulation.
203 */
204 case PCI_PRIMARY_BUS:
205 if (len == 4)
206 *value = 0x00010100;
207 break;
208
209 case PCI_SUBORDINATE_BUS:
210 *value = 1;
211 break;
212
213 case PCI_MEMORY_BASE:
214 case PCI_MEMORY_LIMIT:
215 /* Get the A/V bridge base address. */
216 pci_direct_conf1.read(0, 0, devfn,
217 PCI_BASE_ADDRESS_0, 4, &av_bridge_base);
218
219 av_bridge_limit = av_bridge_base + (512*MB - 1);
220 av_bridge_limit >>= 16;
221 av_bridge_limit &= 0xFFF0;
222
223 av_bridge_base >>= 16;
224 av_bridge_base &= 0xFFF0;
225
226 if (reg == PCI_MEMORY_LIMIT)
227 *value = av_bridge_limit;
228 else if (len == 2)
229 *value = av_bridge_base;
230 else
231 *value = (av_bridge_limit << 16) | av_bridge_base;
232 break;
233 /* Make prefetchable memory limit smaller than prefetchable
234 * memory base, so not claim prefetchable memory space.
235 */
236 case PCI_PREF_MEMORY_BASE:
237 *value = 0xFFF0;
238 break;
239 case PCI_PREF_MEMORY_LIMIT:
240 *value = 0x0;
241 break;
242 /* Make IO limit smaller than IO base, so not claim IO space. */
243 case PCI_IO_BASE:
244 *value = 0xF0;
245 break;
246 case PCI_IO_LIMIT:
247 *value = 0;
248 break;
249 default:
250 retval = 1;
251 }
252 return retval;
253 }
254
255 static int ce4100_conf_read(unsigned int seg, unsigned int bus,
256 unsigned int devfn, int reg, int len, u32 *value)
257 {
258 int i;
259
260 WARN_ON(seg);
261 if (bus == 1) {
262 for (i = 0; i < ARRAY_SIZE(bus1_fixups); i++) {
263 if (bus1_fixups[i].dev_func == devfn &&
264 bus1_fixups[i].reg == (reg & ~3) &&
265 bus1_fixups[i].read) {
266 bus1_fixups[i].read(&(bus1_fixups[i]),
267 value);
268 extract_bytes(value, reg, len);
269 return 0;
270 }
271 }
272 }
273
274 if (bus == 0 && (PCI_DEVFN(1, 0) == devfn) &&
275 !bridge_read(devfn, reg, len, value))
276 return 0;
277
278 return pci_direct_conf1.read(seg, bus, devfn, reg, len, value);
279 }
280
281 static int ce4100_conf_write(unsigned int seg, unsigned int bus,
282 unsigned int devfn, int reg, int len, u32 value)
283 {
284 int i;
285
286 WARN_ON(seg);
287 if (bus == 1) {
288 for (i = 0; i < ARRAY_SIZE(bus1_fixups); i++) {
289 if (bus1_fixups[i].dev_func == devfn &&
290 bus1_fixups[i].reg == (reg & ~3) &&
291 bus1_fixups[i].write) {
292 bus1_fixups[i].write(&(bus1_fixups[i]),
293 value);
294 return 0;
295 }
296 }
297 }
298
299 /* Discard writes to A/V bridge BAR. */
300 if (bus == 0 && PCI_DEVFN(1, 0) == devfn &&
301 ((reg & ~3) == PCI_BASE_ADDRESS_0))
302 return 0;
303
304 return pci_direct_conf1.write(seg, bus, devfn, reg, len, value);
305 }
306
307 static const struct pci_raw_ops ce4100_pci_conf = {
308 .read = ce4100_conf_read,
309 .write = ce4100_conf_write,
310 };
311
312 int __init ce4100_pci_init(void)
313 {
314 init_sim_regs();
315 raw_pci_ops = &ce4100_pci_conf;
316 /* Indicate caller that it should invoke pci_legacy_init() */
317 return 1;
318 }
Linux with added FPC-III support