1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright(c) 2010 Intel Corporation. All rights reserved.
4 *
5 * Contact Information:
6 * Intel Corporation
7 * 2200 Mission College Blvd.
8 * Santa Clara, CA 97052
9 *
10 * This provides access methods for PCI registers that mis-behave on
11 * the CE4100. Each register can be assigned a private init, read and
12 * write routine. The exception to this is the bridge device. The
13 * bridge device is the only device on bus zero (0) that requires any
14 * fixup so it is a special case ATM
15 */
16
17 #include <linux/kernel.h>
18 #include <linux/pci.h>
19 #include <linux/init.h>
20
21 #include <asm/ce4100.h>
22 #include <asm/pci_x86.h>
23
24 struct sim_reg {
25 u32 value;
26 u32 mask;
27 };
28
29 struct sim_dev_reg {
30 int dev_func;
31 int reg;
32 void (*init)(struct sim_dev_reg *reg);
33 void (*read)(struct sim_dev_reg *reg, u32 *value);
34 void (*write)(struct sim_dev_reg *reg, u32 value);
35 struct sim_reg sim_reg;
36 };
37
38 #define MB (1024 * 1024)
39 #define KB (1024)
40 #define SIZE_TO_MASK(size) (~(size - 1))
41
42 #define DEFINE_REG(device, func, offset, size, init_op, read_op, write_op)\
43 { PCI_DEVFN(device, func), offset, init_op, read_op, write_op,\
44 {0, SIZE_TO_MASK(size)} },
45
46 /*
47 * All read/write functions are called with pci_config_lock held.
48 */
49 static void reg_init(struct sim_dev_reg *reg)
50 {
51 pci_direct_conf1.read(0, 1, reg->dev_func, reg->reg, 4,
52 ®->sim_reg.value);
53 }
54
55 static void reg_read(struct sim_dev_reg *reg, u32 *value)
56 {
57 *value = reg->sim_reg.value;
58 }
59
60 static void reg_write(struct sim_dev_reg *reg, u32 value)
61 {
62 reg->sim_reg.value = (value & reg->sim_reg.mask) |
63 (reg->sim_reg.value & ~reg->sim_reg.mask);
64 }
65
66 static void sata_reg_init(struct sim_dev_reg *reg)
67 {
68 pci_direct_conf1.read(0, 1, PCI_DEVFN(14, 0), 0x10, 4,
69 ®->sim_reg.value);
70 reg->sim_reg.value += 0x400;
71 }
72
73 static void ehci_reg_read(struct sim_dev_reg *reg, u32 *value)
74 {
75 reg_read(reg, value);
76 if (*value != reg->sim_reg.mask)
77 *value |= 0x100;
78 }
79
80 static void sata_revid_init(struct sim_dev_reg *reg)
81 {
82 reg->sim_reg.value = 0x01060100;
83 reg->sim_reg.mask = 0;
84 }
85
86 static void sata_revid_read(struct sim_dev_reg *reg, u32 *value)
87 {
88 reg_read(reg, value);
89 }
90
91 static void reg_noirq_read(struct sim_dev_reg *reg, u32 *value)
92 {
93 /* force interrupt pin value to 0 */
94 *value = reg->sim_reg.value & 0xfff00ff;
95 }
96
97 static struct sim_dev_reg bus1_fixups[] = {
98 DEFINE_REG(2, 0, 0x10, (16*MB), reg_init, reg_read, reg_write)
99 DEFINE_REG(2, 0, 0x14, (256), reg_init, reg_read, reg_write)
100 DEFINE_REG(2, 1, 0x10, (64*KB), reg_init, reg_read, reg_write)
101 DEFINE_REG(3, 0, 0x10, (64*KB), reg_init, reg_read, reg_write)
102 DEFINE_REG(4, 0, 0x10, (128*KB), reg_init, reg_read, reg_write)
103 DEFINE_REG(4, 1, 0x10, (128*KB), reg_init, reg_read, reg_write)
104 DEFINE_REG(6, 0, 0x10, (512*KB), reg_init, reg_read, reg_write)
105 DEFINE_REG(6, 1, 0x10, (512*KB), reg_init, reg_read, reg_write)
106 DEFINE_REG(6, 2, 0x10, (64*KB), reg_init, reg_read, reg_write)
107 DEFINE_REG(8, 0, 0x10, (1*MB), reg_init, reg_read, reg_write)
108 DEFINE_REG(8, 1, 0x10, (64*KB), reg_init, reg_read, reg_write)
109 DEFINE_REG(8, 2, 0x10, (64*KB), reg_init, reg_read, reg_write)
110 DEFINE_REG(9, 0, 0x10 , (1*MB), reg_init, reg_read, reg_write)
111 DEFINE_REG(9, 0, 0x14, (64*KB), reg_init, reg_read, reg_write)
112 DEFINE_REG(10, 0, 0x10, (256), reg_init, reg_read, reg_write)
113 DEFINE_REG(10, 0, 0x14, (256*MB), reg_init, reg_read, reg_write)
114 DEFINE_REG(11, 0, 0x10, (256), reg_init, reg_read, reg_write)
115 DEFINE_REG(11, 0, 0x14, (256), reg_init, reg_read, reg_write)
116 DEFINE_REG(11, 1, 0x10, (256), reg_init, reg_read, reg_write)
117 DEFINE_REG(11, 2, 0x10, (256), reg_init, reg_read, reg_write)
118 DEFINE_REG(11, 2, 0x14, (256), reg_init, reg_read, reg_write)
119 DEFINE_REG(11, 2, 0x18, (256), reg_init, reg_read, reg_write)
120 DEFINE_REG(11, 3, 0x10, (256), reg_init, reg_read, reg_write)
121 DEFINE_REG(11, 3, 0x14, (256), reg_init, reg_read, reg_write)
122 DEFINE_REG(11, 4, 0x10, (256), reg_init, reg_read, reg_write)
123 DEFINE_REG(11, 5, 0x10, (64*KB), reg_init, reg_read, reg_write)
124 DEFINE_REG(11, 6, 0x10, (256), reg_init, reg_read, reg_write)
125 DEFINE_REG(11, 7, 0x10, (64*KB), reg_init, reg_read, reg_write)
126 DEFINE_REG(11, 7, 0x3c, 256, reg_init, reg_noirq_read, reg_write)
127 DEFINE_REG(12, 0, 0x10, (128*KB), reg_init, reg_read, reg_write)
128 DEFINE_REG(12, 0, 0x14, (256), reg_init, reg_read, reg_write)
129 DEFINE_REG(12, 1, 0x10, (1024), reg_init, reg_read, reg_write)
130 DEFINE_REG(13, 0, 0x10, (32*KB), reg_init, ehci_reg_read, reg_write)
131 DEFINE_REG(13, 1, 0x10, (32*KB), reg_init, ehci_reg_read, reg_write)
132 DEFINE_REG(14, 0, 0x8, 0, sata_revid_init, sata_revid_read, 0)
133 DEFINE_REG(14, 0, 0x10, 0, reg_init, reg_read, reg_write)
134 DEFINE_REG(14, 0, 0x14, 0, reg_init, reg_read, reg_write)
135 DEFINE_REG(14, 0, 0x18, 0, reg_init, reg_read, reg_write)
136 DEFINE_REG(14, 0, 0x1C, 0, reg_init, reg_read, reg_write)
137 DEFINE_REG(14, 0, 0x20, 0, reg_init, reg_read, reg_write)
138 DEFINE_REG(14, 0, 0x24, (0x200), sata_reg_init, reg_read, reg_write)
139 DEFINE_REG(15, 0, 0x10, (64*KB), reg_init, reg_read, reg_write)
140 DEFINE_REG(15, 0, 0x14, (64*KB), reg_init, reg_read, reg_write)
141 DEFINE_REG(16, 0, 0x10, (64*KB), reg_init, reg_read, reg_write)
142 DEFINE_REG(16, 0, 0x14, (64*MB), reg_init, reg_read, reg_write)
143 DEFINE_REG(16, 0, 0x18, (64*MB), reg_init, reg_read, reg_write)
144 DEFINE_REG(16, 0, 0x3c, 256, reg_init, reg_noirq_read, reg_write)
145 DEFINE_REG(17, 0, 0x10, (128*KB), reg_init, reg_read, reg_write)
146 DEFINE_REG(18, 0, 0x10, (1*KB), reg_init, reg_read, reg_write)
147 DEFINE_REG(18, 0, 0x3c, 256, reg_init, reg_noirq_read, reg_write)
148 };
149
150 static void __init init_sim_regs(void)
151 {
152 int i;
153
154 for (i = 0; i < ARRAY_SIZE(bus1_fixups); i++) {
155 if (bus1_fixups[i].init)
156 bus1_fixups[i].init(&bus1_fixups[i]);
157 }
158 }
159
160 static inline void extract_bytes(u32 *value, int reg, int len)
161 {
162 uint32_t mask;
163
164 *value >>= ((reg & 3) * 8);
165 mask = 0xFFFFFFFF >> ((4 - len) * 8);
166 *value &= mask;
167 }
168
169 static int bridge_read(unsigned int devfn, int reg, int len, u32 *value)
170 {
171 u32 av_bridge_base, av_bridge_limit;
172 int retval = 0;
173
174 switch (reg) {
175 /* Make BARs appear to not request any memory. */
176 case PCI_BASE_ADDRESS_0:
177 case PCI_BASE_ADDRESS_0 + 1:
178 case PCI_BASE_ADDRESS_0 + 2:
179 case PCI_BASE_ADDRESS_0 + 3:
180 *value = 0;
181 break;
182
183 /* Since subordinate bus number register is hardwired
184 * to zero and read only, so do the simulation.
185 */
186 case PCI_PRIMARY_BUS:
187 if (len == 4)
188 *value = 0x00010100;
189 break;
190
191 case PCI_SUBORDINATE_BUS:
192 *value = 1;
193 break;
194
195 case PCI_MEMORY_BASE:
196 case PCI_MEMORY_LIMIT:
197 /* Get the A/V bridge base address. */
198 pci_direct_conf1.read(0, 0, devfn,
199 PCI_BASE_ADDRESS_0, 4, &av_bridge_base);
200
201 av_bridge_limit = av_bridge_base + (512*MB - 1);
202 av_bridge_limit >>= 16;
203 av_bridge_limit &= 0xFFF0;
204
205 av_bridge_base >>= 16;
206 av_bridge_base &= 0xFFF0;
207
208 if (reg == PCI_MEMORY_LIMIT)
209 *value = av_bridge_limit;
210 else if (len == 2)
211 *value = av_bridge_base;
212 else
213 *value = (av_bridge_limit << 16) | av_bridge_base;
214 break;
215 /* Make prefetchable memory limit smaller than prefetchable
216 * memory base, so not claim prefetchable memory space.
217 */
218 case PCI_PREF_MEMORY_BASE:
219 *value = 0xFFF0;
220 break;
221 case PCI_PREF_MEMORY_LIMIT:
222 *value = 0x0;
223 break;
224 /* Make IO limit smaller than IO base, so not claim IO space. */
225 case PCI_IO_BASE:
226 *value = 0xF0;
227 break;
228 case PCI_IO_LIMIT:
229 *value = 0;
230 break;
231 default:
232 retval = 1;
233 }
234 return retval;
235 }
236
237 static int ce4100_bus1_read(unsigned int devfn, int reg, int len, u32 *value)
238 {
239 unsigned long flags;
240 int i;
241
242 for (i = 0; i < ARRAY_SIZE(bus1_fixups); i++) {
243 if (bus1_fixups[i].dev_func == devfn &&
244 bus1_fixups[i].reg == (reg & ~3) &&
245 bus1_fixups[i].read) {
246
247 raw_spin_lock_irqsave(&pci_config_lock, flags);
248 bus1_fixups[i].read(&(bus1_fixups[i]), value);
249 raw_spin_unlock_irqrestore(&pci_config_lock, flags);
250 extract_bytes(value, reg, len);
251 return 0;
252 }
253 }
254 return -1;
255 }
256
257 static int ce4100_conf_read(unsigned int seg, unsigned int bus,
258 unsigned int devfn, int reg, int len, u32 *value)
259 {
260 WARN_ON(seg);
261
262 if (bus == 1 && !ce4100_bus1_read(devfn, reg, len, value))
263 return 0;
264
265 if (bus == 0 && (PCI_DEVFN(1, 0) == devfn) &&
266 !bridge_read(devfn, reg, len, value))
267 return 0;
268
269 return pci_direct_conf1.read(seg, bus, devfn, reg, len, value);
270 }
271
272 static int ce4100_bus1_write(unsigned int devfn, int reg, int len, u32 value)
273 {
274 unsigned long flags;
275 int i;
276
277 for (i = 0; i < ARRAY_SIZE(bus1_fixups); i++) {
278 if (bus1_fixups[i].dev_func == devfn &&
279 bus1_fixups[i].reg == (reg & ~3) &&
280 bus1_fixups[i].write) {
281
282 raw_spin_lock_irqsave(&pci_config_lock, flags);
283 bus1_fixups[i].write(&(bus1_fixups[i]), value);
284 raw_spin_unlock_irqrestore(&pci_config_lock, flags);
285 return 0;
286 }
287 }
288 return -1;
289 }
290
291 static int ce4100_conf_write(unsigned int seg, unsigned int bus,
292 unsigned int devfn, int reg, int len, u32 value)
293 {
294 WARN_ON(seg);
295
296 if (bus == 1 && !ce4100_bus1_write(devfn, reg, len, value))
297 return 0;
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 }
319
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