xref: /openbmc/linux/arch/x86/pci/ce4100.c (revision baa7eb025ab14f3cba2e35c0a8648f9c9f01d24f)
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/pci_x86.h>
38 
39 struct sim_reg {
40 	u32 value;
41 	u32 mask;
42 };
43 
44 struct sim_dev_reg {
45 	int dev_func;
46 	int reg;
47 	void (*init)(struct sim_dev_reg *reg);
48 	void (*read)(struct sim_dev_reg *reg, u32 *value);
49 	void (*write)(struct sim_dev_reg *reg, u32 value);
50 	struct sim_reg sim_reg;
51 };
52 
53 struct sim_reg_op {
54 	void (*init)(struct sim_dev_reg *reg);
55 	void (*read)(struct sim_dev_reg *reg, u32 value);
56 	void (*write)(struct sim_dev_reg *reg, u32 value);
57 };
58 
59 #define MB (1024 * 1024)
60 #define KB (1024)
61 #define SIZE_TO_MASK(size) (~(size - 1))
62 
63 #define DEFINE_REG(device, func, offset, size, init_op, read_op, write_op)\
64 { PCI_DEVFN(device, func), offset, init_op, read_op, write_op,\
65 	{0, SIZE_TO_MASK(size)} },
66 
67 static void reg_init(struct sim_dev_reg *reg)
68 {
69 	pci_direct_conf1.read(0, 1, reg->dev_func, reg->reg, 4,
70 			      &reg->sim_reg.value);
71 }
72 
73 static void reg_read(struct sim_dev_reg *reg, u32 *value)
74 {
75 	unsigned long flags;
76 
77 	raw_spin_lock_irqsave(&pci_config_lock, flags);
78 	*value = reg->sim_reg.value;
79 	raw_spin_unlock_irqrestore(&pci_config_lock, flags);
80 }
81 
82 static void reg_write(struct sim_dev_reg *reg, u32 value)
83 {
84 	unsigned long flags;
85 
86 	raw_spin_lock_irqsave(&pci_config_lock, flags);
87 	reg->sim_reg.value = (value & reg->sim_reg.mask) |
88 		(reg->sim_reg.value & ~reg->sim_reg.mask);
89 	raw_spin_unlock_irqrestore(&pci_config_lock, flags);
90 }
91 
92 static void sata_reg_init(struct sim_dev_reg *reg)
93 {
94 	pci_direct_conf1.read(0, 1, PCI_DEVFN(14, 0), 0x10, 4,
95 			      &reg->sim_reg.value);
96 	reg->sim_reg.value += 0x400;
97 }
98 
99 static void ehci_reg_read(struct sim_dev_reg *reg, u32 *value)
100 {
101 	reg_read(reg, value);
102 	if (*value != reg->sim_reg.mask)
103 		*value |= 0x100;
104 }
105 
106 void sata_revid_init(struct sim_dev_reg *reg)
107 {
108 	reg->sim_reg.value = 0x01060100;
109 	reg->sim_reg.mask = 0;
110 }
111 
112 static void sata_revid_read(struct sim_dev_reg *reg, u32 *value)
113 {
114 	reg_read(reg, value);
115 }
116 
117 static struct sim_dev_reg bus1_fixups[] = {
118 	DEFINE_REG(2, 0, 0x10, (16*MB), reg_init, reg_read, reg_write)
119 	DEFINE_REG(2, 0, 0x14, (256), reg_init, reg_read, reg_write)
120 	DEFINE_REG(2, 1, 0x10, (64*KB), reg_init, reg_read, reg_write)
121 	DEFINE_REG(3, 0, 0x10, (64*KB), reg_init, reg_read, reg_write)
122 	DEFINE_REG(4, 0, 0x10, (128*KB), reg_init, reg_read, reg_write)
123 	DEFINE_REG(4, 1, 0x10, (128*KB), reg_init, reg_read, reg_write)
124 	DEFINE_REG(6, 0, 0x10, (512*KB), reg_init, reg_read, reg_write)
125 	DEFINE_REG(6, 1, 0x10, (512*KB), reg_init, reg_read, reg_write)
126 	DEFINE_REG(6, 2, 0x10, (64*KB), reg_init, reg_read, reg_write)
127 	DEFINE_REG(8, 0, 0x10, (1*MB), reg_init, reg_read, reg_write)
128 	DEFINE_REG(8, 1, 0x10, (64*KB), reg_init, reg_read, reg_write)
129 	DEFINE_REG(8, 2, 0x10, (64*KB), reg_init, reg_read, reg_write)
130 	DEFINE_REG(9, 0, 0x10 , (1*MB), reg_init, reg_read, reg_write)
131 	DEFINE_REG(9, 0, 0x14, (64*KB), reg_init, reg_read, reg_write)
132 	DEFINE_REG(10, 0, 0x10, (256), reg_init, reg_read, reg_write)
133 	DEFINE_REG(10, 0, 0x14, (256*MB), reg_init, reg_read, reg_write)
134 	DEFINE_REG(11, 0, 0x10, (256), reg_init, reg_read, reg_write)
135 	DEFINE_REG(11, 0, 0x14, (256), reg_init, reg_read, reg_write)
136 	DEFINE_REG(11, 1, 0x10, (256), reg_init, reg_read, reg_write)
137 	DEFINE_REG(11, 2, 0x10, (256), reg_init, reg_read, reg_write)
138 	DEFINE_REG(11, 2, 0x14, (256), reg_init, reg_read, reg_write)
139 	DEFINE_REG(11, 2, 0x18, (256), reg_init, reg_read, reg_write)
140 	DEFINE_REG(11, 3, 0x10, (256), reg_init, reg_read, reg_write)
141 	DEFINE_REG(11, 3, 0x14, (256), reg_init, reg_read, reg_write)
142 	DEFINE_REG(11, 4, 0x10, (256), reg_init, reg_read, reg_write)
143 	DEFINE_REG(11, 5, 0x10, (64*KB), reg_init, reg_read, reg_write)
144 	DEFINE_REG(11, 6, 0x10, (256), reg_init, reg_read, reg_write)
145 	DEFINE_REG(11, 7, 0x10, (64*KB), reg_init, reg_read, reg_write)
146 	DEFINE_REG(12, 0, 0x10, (128*KB), reg_init, reg_read, reg_write)
147 	DEFINE_REG(12, 0, 0x14, (256), reg_init, reg_read, reg_write)
148 	DEFINE_REG(12, 1, 0x10, (1024), reg_init, reg_read, reg_write)
149 	DEFINE_REG(13, 0, 0x10, (32*KB), reg_init, ehci_reg_read, reg_write)
150 	DEFINE_REG(13, 1, 0x10, (32*KB), reg_init, ehci_reg_read, reg_write)
151 	DEFINE_REG(14, 0, 0x8,  0, sata_revid_init, sata_revid_read, 0)
152 	DEFINE_REG(14, 0, 0x10, 0, reg_init, reg_read, reg_write)
153 	DEFINE_REG(14, 0, 0x14, 0, reg_init, reg_read, reg_write)
154 	DEFINE_REG(14, 0, 0x18, 0, reg_init, reg_read, reg_write)
155 	DEFINE_REG(14, 0, 0x1C, 0, reg_init, reg_read, reg_write)
156 	DEFINE_REG(14, 0, 0x20, 0, reg_init, reg_read, reg_write)
157 	DEFINE_REG(14, 0, 0x24, (0x200), sata_reg_init, reg_read, reg_write)
158 	DEFINE_REG(15, 0, 0x10, (64*KB), reg_init, reg_read, reg_write)
159 	DEFINE_REG(15, 0, 0x14, (64*KB), reg_init, reg_read, reg_write)
160 	DEFINE_REG(16, 0, 0x10, (64*KB), reg_init, reg_read, reg_write)
161 	DEFINE_REG(16, 0, 0x14, (64*MB), reg_init, reg_read, reg_write)
162 	DEFINE_REG(16, 0, 0x18, (64*MB), reg_init, reg_read, reg_write)
163 	DEFINE_REG(17, 0, 0x10, (128*KB), reg_init, reg_read, reg_write)
164 	DEFINE_REG(18, 0, 0x10, (1*KB), reg_init, reg_read, reg_write)
165 };
166 
167 static void __init init_sim_regs(void)
168 {
169 	int i;
170 
171 	for (i = 0; i < ARRAY_SIZE(bus1_fixups); i++) {
172 		if (bus1_fixups[i].init)
173 			bus1_fixups[i].init(&bus1_fixups[i]);
174 	}
175 }
176 
177 static inline void extract_bytes(u32 *value, int reg, int len)
178 {
179 	uint32_t mask;
180 
181 	*value >>= ((reg & 3) * 8);
182 	mask = 0xFFFFFFFF >> ((4 - len) * 8);
183 	*value &= mask;
184 }
185 
186 int bridge_read(unsigned int devfn, int reg, int len, u32 *value)
187 {
188 	u32 av_bridge_base, av_bridge_limit;
189 	int retval = 0;
190 
191 	switch (reg) {
192 	/* Make BARs appear to not request any memory. */
193 	case PCI_BASE_ADDRESS_0:
194 	case PCI_BASE_ADDRESS_0 + 1:
195 	case PCI_BASE_ADDRESS_0 + 2:
196 	case PCI_BASE_ADDRESS_0 + 3:
197 		*value = 0;
198 		break;
199 
200 		/* Since subordinate bus number register is hardwired
201 		 * to zero and read only, so do the simulation.
202 		 */
203 	case PCI_PRIMARY_BUS:
204 		if (len == 4)
205 			*value = 0x00010100;
206 		break;
207 
208 	case PCI_SUBORDINATE_BUS:
209 		*value = 1;
210 		break;
211 
212 	case PCI_MEMORY_BASE:
213 	case PCI_MEMORY_LIMIT:
214 		/* Get the A/V bridge base address. */
215 		pci_direct_conf1.read(0, 0, devfn,
216 				PCI_BASE_ADDRESS_0, 4, &av_bridge_base);
217 
218 		av_bridge_limit = av_bridge_base + (512*MB - 1);
219 		av_bridge_limit >>= 16;
220 		av_bridge_limit &= 0xFFF0;
221 
222 		av_bridge_base >>= 16;
223 		av_bridge_base &= 0xFFF0;
224 
225 		if (reg == PCI_MEMORY_LIMIT)
226 			*value = av_bridge_limit;
227 		else if (len == 2)
228 			*value = av_bridge_base;
229 		else
230 			*value = (av_bridge_limit << 16) | av_bridge_base;
231 		break;
232 		/* Make prefetchable memory limit smaller than prefetchable
233 		 * memory base, so not claim prefetchable memory space.
234 		 */
235 	case PCI_PREF_MEMORY_BASE:
236 		*value = 0xFFF0;
237 		break;
238 	case PCI_PREF_MEMORY_LIMIT:
239 		*value = 0x0;
240 		break;
241 		/* Make IO limit smaller than IO base, so not claim IO space. */
242 	case PCI_IO_BASE:
243 		*value = 0xF0;
244 		break;
245 	case PCI_IO_LIMIT:
246 		*value = 0;
247 		break;
248 	default:
249 		retval = 1;
250 	}
251 	return retval;
252 }
253 
254 static int ce4100_conf_read(unsigned int seg, unsigned int bus,
255 			    unsigned int devfn, int reg, int len, u32 *value)
256 {
257 	int i, retval = 1;
258 
259 	if (bus == 1) {
260 		for (i = 0; i < ARRAY_SIZE(bus1_fixups); i++) {
261 			if (bus1_fixups[i].dev_func == devfn &&
262 			    bus1_fixups[i].reg == (reg & ~3) &&
263 			    bus1_fixups[i].read) {
264 				bus1_fixups[i].read(&(bus1_fixups[i]),
265 						    value);
266 				extract_bytes(value, reg, len);
267 				return 0;
268 			}
269 		}
270 	}
271 
272 	if (bus == 0 && (PCI_DEVFN(1, 0) == devfn) &&
273 	    !bridge_read(devfn, reg, len, value))
274 		return 0;
275 
276 	return pci_direct_conf1.read(seg, bus, devfn, reg, len, value);
277 }
278 
279 static int ce4100_conf_write(unsigned int seg, unsigned int bus,
280 			     unsigned int devfn, int reg, int len, u32 value)
281 {
282 	int i;
283 
284 	if (bus == 1) {
285 		for (i = 0; i < ARRAY_SIZE(bus1_fixups); i++) {
286 			if (bus1_fixups[i].dev_func == devfn &&
287 			    bus1_fixups[i].reg == (reg & ~3) &&
288 			    bus1_fixups[i].write) {
289 				bus1_fixups[i].write(&(bus1_fixups[i]),
290 						     value);
291 				return 0;
292 			}
293 		}
294 	}
295 
296 	/* Discard writes to A/V bridge BAR. */
297 	if (bus == 0 && PCI_DEVFN(1, 0) == devfn &&
298 	    ((reg & ~3) == PCI_BASE_ADDRESS_0))
299 		return 0;
300 
301 	return pci_direct_conf1.write(seg, bus, devfn, reg, len, value);
302 }
303 
304 struct pci_raw_ops ce4100_pci_conf = {
305 	.read =	ce4100_conf_read,
306 	.write = ce4100_conf_write,
307 };
308 
309 static int __init ce4100_pci_init(void)
310 {
311 	init_sim_regs();
312 	raw_pci_ops = &ce4100_pci_conf;
313 	return 0;
314 }
315 subsys_initcall(ce4100_pci_init);
316