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[PATCH] i2c: kzalloc conversion, other drivers
[linux-2.6/x86.git] / drivers / i2c / busses / i2c-nforce2.c
blob87b6e26aa8a0bd13e65544aa2e0312671daa83d9
1 /*
2 SMBus driver for nVidia nForce2 MCP
3
4 Added nForce3 Pro 150 Thomas Leibold <thomas@plx.com>,
5 Ported to 2.5 Patrick Dreker <patrick@dreker.de>,
6 Copyright (c) 2003 Hans-Frieder Vogt <hfvogt@arcor.de>,
7 Based on
8 SMBus 2.0 driver for AMD-8111 IO-Hub
9 Copyright (c) 2002 Vojtech Pavlik
10
11 This program is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License as published by
13 the Free Software Foundation; either version 2 of the License, or
14 (at your option) any later version.
15
16 This program is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 GNU General Public License for more details.
20
21 You should have received a copy of the GNU General Public License
22 along with this program; if not, write to the Free Software
23 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 */
25
26 /*
27 SUPPORTED DEVICES PCI ID
28 nForce2 MCP 0064
29 nForce2 Ultra 400 MCP 0084
30 nForce3 Pro150 MCP 00D4
31 nForce3 250Gb MCP 00E4
32 nForce4 MCP 0052
33
34 This driver supports the 2 SMBuses that are included in the MCP of the
35 nForce2/3/4 chipsets.
36 */
37
38 /* Note: we assume there can only be one nForce2, with two SMBus interfaces */
39
40 #include <linux/module.h>
41 #include <linux/pci.h>
42 #include <linux/kernel.h>
43 #include <linux/stddef.h>
44 #include <linux/sched.h>
45 #include <linux/ioport.h>
46 #include <linux/init.h>
47 #include <linux/i2c.h>
48 #include <linux/delay.h>
49 #include <asm/io.h>
50
51 MODULE_LICENSE("GPL");
52 MODULE_AUTHOR ("Hans-Frieder Vogt <hfvogt@arcor.de>");
53 MODULE_DESCRIPTION("nForce2 SMBus driver");
54
55
56 struct nforce2_smbus {
57 struct pci_dev *dev;
58 struct i2c_adapter adapter;
59 int base;
60 int size;
61 };
62
63
64 /*
65 * nVidia nForce2 SMBus control register definitions
66 */
67 #define NFORCE_PCI_SMB1 0x50
68 #define NFORCE_PCI_SMB2 0x54
69
70
71 /*
72 * ACPI 2.0 chapter 13 SMBus 2.0 EC register model
73 */
74 #define NVIDIA_SMB_PRTCL (smbus->base + 0x00) /* protocol, PEC */
75 #define NVIDIA_SMB_STS (smbus->base + 0x01) /* status */
76 #define NVIDIA_SMB_ADDR (smbus->base + 0x02) /* address */
77 #define NVIDIA_SMB_CMD (smbus->base + 0x03) /* command */
78 #define NVIDIA_SMB_DATA (smbus->base + 0x04) /* 32 data registers */
79 #define NVIDIA_SMB_BCNT (smbus->base + 0x24) /* number of data bytes */
80 #define NVIDIA_SMB_ALRM_A (smbus->base + 0x25) /* alarm address */
81 #define NVIDIA_SMB_ALRM_D (smbus->base + 0x26) /* 2 bytes alarm data */
82
83 #define NVIDIA_SMB_STS_DONE 0x80
84 #define NVIDIA_SMB_STS_ALRM 0x40
85 #define NVIDIA_SMB_STS_RES 0x20
86 #define NVIDIA_SMB_STS_STATUS 0x1f
87
88 #define NVIDIA_SMB_PRTCL_WRITE 0x00
89 #define NVIDIA_SMB_PRTCL_READ 0x01
90 #define NVIDIA_SMB_PRTCL_QUICK 0x02
91 #define NVIDIA_SMB_PRTCL_BYTE 0x04
92 #define NVIDIA_SMB_PRTCL_BYTE_DATA 0x06
93 #define NVIDIA_SMB_PRTCL_WORD_DATA 0x08
94 #define NVIDIA_SMB_PRTCL_BLOCK_DATA 0x0a
95 #define NVIDIA_SMB_PRTCL_PROC_CALL 0x0c
96 #define NVIDIA_SMB_PRTCL_BLOCK_PROC_CALL 0x0d
97 #define NVIDIA_SMB_PRTCL_I2C_BLOCK_DATA 0x4a
98 #define NVIDIA_SMB_PRTCL_PEC 0x80
99
100 static struct pci_driver nforce2_driver;
101
102 static s32 nforce2_access(struct i2c_adapter *adap, u16 addr,
103 unsigned short flags, char read_write,
104 u8 command, int size, union i2c_smbus_data *data);
105 static u32 nforce2_func(struct i2c_adapter *adapter);
106
107
108 static struct i2c_algorithm smbus_algorithm = {
109 .smbus_xfer = nforce2_access,
110 .functionality = nforce2_func,
111 };
112
113 static struct i2c_adapter nforce2_adapter = {
114 .owner = THIS_MODULE,
115 .class = I2C_CLASS_HWMON,
116 .algo = &smbus_algorithm,
117 };
118
119 /* Return -1 on error. See smbus.h for more information */
120 static s32 nforce2_access(struct i2c_adapter * adap, u16 addr,
121 unsigned short flags, char read_write,
122 u8 command, int size, union i2c_smbus_data * data)
123 {
124 struct nforce2_smbus *smbus = adap->algo_data;
125 unsigned char protocol, pec, temp;
126 unsigned char len = 0; /* to keep the compiler quiet */
127 int i;
128
129 protocol = (read_write == I2C_SMBUS_READ) ? NVIDIA_SMB_PRTCL_READ :
130 NVIDIA_SMB_PRTCL_WRITE;
131 pec = (flags & I2C_CLIENT_PEC) ? NVIDIA_SMB_PRTCL_PEC : 0;
132
133 switch (size) {
134
135 case I2C_SMBUS_QUICK:
136 protocol |= NVIDIA_SMB_PRTCL_QUICK;
137 read_write = I2C_SMBUS_WRITE;
138 break;
139
140 case I2C_SMBUS_BYTE:
141 if (read_write == I2C_SMBUS_WRITE)
142 outb_p(command, NVIDIA_SMB_CMD);
143 protocol |= NVIDIA_SMB_PRTCL_BYTE;
144 break;
145
146 case I2C_SMBUS_BYTE_DATA:
147 outb_p(command, NVIDIA_SMB_CMD);
148 if (read_write == I2C_SMBUS_WRITE)
149 outb_p(data->byte, NVIDIA_SMB_DATA);
150 protocol |= NVIDIA_SMB_PRTCL_BYTE_DATA;
151 break;
152
153 case I2C_SMBUS_WORD_DATA:
154 outb_p(command, NVIDIA_SMB_CMD);
155 if (read_write == I2C_SMBUS_WRITE) {
156 outb_p(data->word, NVIDIA_SMB_DATA);
157 outb_p(data->word >> 8, NVIDIA_SMB_DATA+1);
158 }
159 protocol |= NVIDIA_SMB_PRTCL_WORD_DATA | pec;
160 break;
161
162 case I2C_SMBUS_BLOCK_DATA:
163 outb_p(command, NVIDIA_SMB_CMD);
164 if (read_write == I2C_SMBUS_WRITE) {
165 len = min_t(u8, data->block[0], 32);
166 outb_p(len, NVIDIA_SMB_BCNT);
167 for (i = 0; i < len; i++)
168 outb_p(data->block[i + 1], NVIDIA_SMB_DATA+i);
169 }
170 protocol |= NVIDIA_SMB_PRTCL_BLOCK_DATA | pec;
171 break;
172
173 case I2C_SMBUS_I2C_BLOCK_DATA:
174 len = min_t(u8, data->block[0], 32);
175 outb_p(command, NVIDIA_SMB_CMD);
176 outb_p(len, NVIDIA_SMB_BCNT);
177 if (read_write == I2C_SMBUS_WRITE)
178 for (i = 0; i < len; i++)
179 outb_p(data->block[i + 1], NVIDIA_SMB_DATA+i);
180 protocol |= NVIDIA_SMB_PRTCL_I2C_BLOCK_DATA;
181 break;
182
183 case I2C_SMBUS_PROC_CALL:
184 dev_err(&adap->dev, "I2C_SMBUS_PROC_CALL not supported!\n");
185 return -1;
186
187 case I2C_SMBUS_BLOCK_PROC_CALL:
188 dev_err(&adap->dev, "I2C_SMBUS_BLOCK_PROC_CALL not supported!\n");
189 return -1;
190
191 case I2C_SMBUS_WORD_DATA_PEC:
192 case I2C_SMBUS_BLOCK_DATA_PEC:
193 case I2C_SMBUS_PROC_CALL_PEC:
194 case I2C_SMBUS_BLOCK_PROC_CALL_PEC:
195 dev_err(&adap->dev, "Unexpected software PEC transaction %d\n.", size);
196 return -1;
197
198 default:
199 dev_err(&adap->dev, "Unsupported transaction %d\n", size);
200 return -1;
201 }
202
203 outb_p((addr & 0x7f) << 1, NVIDIA_SMB_ADDR);
204 outb_p(protocol, NVIDIA_SMB_PRTCL);
205
206 temp = inb_p(NVIDIA_SMB_STS);
207
208 if (~temp & NVIDIA_SMB_STS_DONE) {
209 udelay(500);
210 temp = inb_p(NVIDIA_SMB_STS);
211 }
212 if (~temp & NVIDIA_SMB_STS_DONE) {
213 msleep(10);
214 temp = inb_p(NVIDIA_SMB_STS);
215 }
216
217 if ((~temp & NVIDIA_SMB_STS_DONE) || (temp & NVIDIA_SMB_STS_STATUS)) {
218 dev_dbg(&adap->dev, "SMBus Timeout! (0x%02x)\n", temp);
219 return -1;
220 }
221
222 if (read_write == I2C_SMBUS_WRITE)
223 return 0;
224
225 switch (size) {
226
227 case I2C_SMBUS_BYTE:
228 case I2C_SMBUS_BYTE_DATA:
229 data->byte = inb_p(NVIDIA_SMB_DATA);
230 break;
231
232 case I2C_SMBUS_WORD_DATA:
233 /* case I2C_SMBUS_PROC_CALL: not supported */
234 data->word = inb_p(NVIDIA_SMB_DATA) | (inb_p(NVIDIA_SMB_DATA+1) << 8);
235 break;
236
237 case I2C_SMBUS_BLOCK_DATA:
238 /* case I2C_SMBUS_BLOCK_PROC_CALL: not supported */
239 len = inb_p(NVIDIA_SMB_BCNT);
240 len = min_t(u8, len, 32);
241 case I2C_SMBUS_I2C_BLOCK_DATA:
242 for (i = 0; i < len; i++)
243 data->block[i+1] = inb_p(NVIDIA_SMB_DATA + i);
244 data->block[0] = len;
245 break;
246 }
247
248 return 0;
249 }
250
251
252 static u32 nforce2_func(struct i2c_adapter *adapter)
253 {
254 /* other functionality might be possible, but is not tested */
255 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
256 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA /* |
257 I2C_FUNC_SMBUS_BLOCK_DATA */;
258 }
259
260
261 static struct pci_device_id nforce2_ids[] = {
262 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2_SMBUS) },
263 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2S_SMBUS) },
264 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3_SMBUS) },
265 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3S_SMBUS) },
266 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE4_SMBUS) },
267 { 0 }
268 };
269
270
271 MODULE_DEVICE_TABLE (pci, nforce2_ids);
272
273
274 static int __devinit nforce2_probe_smb (struct pci_dev *dev, int reg,
275 struct nforce2_smbus *smbus, char *name)
276 {
277 u16 iobase;
278 int error;
279
280 if (pci_read_config_word(dev, reg, &iobase) != PCIBIOS_SUCCESSFUL) {
281 dev_err(&smbus->adapter.dev, "Error reading PCI config for %s\n", name);
282 return -1;
283 }
284 smbus->dev = dev;
285 smbus->base = iobase & 0xfffc;
286 smbus->size = 8;
287
288 if (!request_region(smbus->base, smbus->size, nforce2_driver.name)) {
289 dev_err(&smbus->adapter.dev, "Error requesting region %02x .. %02X for %s\n",
290 smbus->base, smbus->base+smbus->size-1, name);
291 return -1;
292 }
293 smbus->adapter = nforce2_adapter;
294 smbus->adapter.algo_data = smbus;
295 smbus->adapter.dev.parent = &dev->dev;
296 snprintf(smbus->adapter.name, I2C_NAME_SIZE,
297 "SMBus nForce2 adapter at %04x", smbus->base);
298
299 error = i2c_add_adapter(&smbus->adapter);
300 if (error) {
301 dev_err(&smbus->adapter.dev, "Failed to register adapter.\n");
302 release_region(smbus->base, smbus->size);
303 return -1;
304 }
305 dev_info(&smbus->adapter.dev, "nForce2 SMBus adapter at %#x\n", smbus->base);
306 return 0;
307 }
308
309
310 static int __devinit nforce2_probe(struct pci_dev *dev, const struct pci_device_id *id)
311 {
312 struct nforce2_smbus *smbuses;
313 int res1, res2;
314
315 /* we support 2 SMBus adapters */
316 if (!(smbuses = (void *)kzalloc(2*sizeof(struct nforce2_smbus),
317 GFP_KERNEL)))
318 return -ENOMEM;
319 pci_set_drvdata(dev, smbuses);
320
321 /* SMBus adapter 1 */
322 res1 = nforce2_probe_smb (dev, NFORCE_PCI_SMB1, &smbuses[0], "SMB1");
323 if (res1 < 0) {
324 dev_err(&dev->dev, "Error probing SMB1.\n");
325 smbuses[0].base = 0; /* to have a check value */
326 }
327 res2 = nforce2_probe_smb (dev, NFORCE_PCI_SMB2, &smbuses[1], "SMB2");
328 if (res2 < 0) {
329 dev_err(&dev->dev, "Error probing SMB2.\n");
330 smbuses[1].base = 0; /* to have a check value */
331 }
332 if ((res1 < 0) && (res2 < 0)) {
333 /* we did not find even one of the SMBuses, so we give up */
334 kfree(smbuses);
335 return -ENODEV;
336 }
337
338 return 0;
339 }
340
341
342 static void __devexit nforce2_remove(struct pci_dev *dev)
343 {
344 struct nforce2_smbus *smbuses = (void*) pci_get_drvdata(dev);
345
346 if (smbuses[0].base) {
347 i2c_del_adapter(&smbuses[0].adapter);
348 release_region(smbuses[0].base, smbuses[0].size);
349 }
350 if (smbuses[1].base) {
351 i2c_del_adapter(&smbuses[1].adapter);
352 release_region(smbuses[1].base, smbuses[1].size);
353 }
354 kfree(smbuses);
355 }
356
357 static struct pci_driver nforce2_driver = {
358 .owner = THIS_MODULE,
359 .name = "nForce2_smbus",
360 .id_table = nforce2_ids,
361 .probe = nforce2_probe,
362 .remove = __devexit_p(nforce2_remove),
363 };
364
365 static int __init nforce2_init(void)
366 {
367 return pci_register_driver(&nforce2_driver);
368 }
369
370 static void __exit nforce2_exit(void)
371 {
372 pci_unregister_driver(&nforce2_driver);
373 }
374
375 module_init(nforce2_init);
376 module_exit(nforce2_exit);
377
x86 "subsystem" repository