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Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
[mirror_ubuntu-jammy-kernel.git] / drivers / i2c / busses / i2c-i801.c
1 /*
2 Copyright (c) 1998 - 2002 Frodo Looijaard <frodol@dds.nl>,
3 Philip Edelbrock <phil@netroedge.com>, and Mark D. Studebaker
4 <mdsxyz123@yahoo.com>
5 Copyright (C) 2007 - 2014 Jean Delvare <jdelvare@suse.de>
6 Copyright (C) 2010 Intel Corporation,
7 David Woodhouse <dwmw2@infradead.org>
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18 */
19
20 /*
21 * Supports the following Intel I/O Controller Hubs (ICH):
22 *
23 * I/O Block I2C
24 * region SMBus Block proc. block
25 * Chip name PCI ID size PEC buffer call read
26 * ---------------------------------------------------------------------------
27 * 82801AA (ICH) 0x2413 16 no no no no
28 * 82801AB (ICH0) 0x2423 16 no no no no
29 * 82801BA (ICH2) 0x2443 16 no no no no
30 * 82801CA (ICH3) 0x2483 32 soft no no no
31 * 82801DB (ICH4) 0x24c3 32 hard yes no no
32 * 82801E (ICH5) 0x24d3 32 hard yes yes yes
33 * 6300ESB 0x25a4 32 hard yes yes yes
34 * 82801F (ICH6) 0x266a 32 hard yes yes yes
35 * 6310ESB/6320ESB 0x269b 32 hard yes yes yes
36 * 82801G (ICH7) 0x27da 32 hard yes yes yes
37 * 82801H (ICH8) 0x283e 32 hard yes yes yes
38 * 82801I (ICH9) 0x2930 32 hard yes yes yes
39 * EP80579 (Tolapai) 0x5032 32 hard yes yes yes
40 * ICH10 0x3a30 32 hard yes yes yes
41 * ICH10 0x3a60 32 hard yes yes yes
42 * 5/3400 Series (PCH) 0x3b30 32 hard yes yes yes
43 * 6 Series (PCH) 0x1c22 32 hard yes yes yes
44 * Patsburg (PCH) 0x1d22 32 hard yes yes yes
45 * Patsburg (PCH) IDF 0x1d70 32 hard yes yes yes
46 * Patsburg (PCH) IDF 0x1d71 32 hard yes yes yes
47 * Patsburg (PCH) IDF 0x1d72 32 hard yes yes yes
48 * DH89xxCC (PCH) 0x2330 32 hard yes yes yes
49 * Panther Point (PCH) 0x1e22 32 hard yes yes yes
50 * Lynx Point (PCH) 0x8c22 32 hard yes yes yes
51 * Lynx Point-LP (PCH) 0x9c22 32 hard yes yes yes
52 * Avoton (SOC) 0x1f3c 32 hard yes yes yes
53 * Wellsburg (PCH) 0x8d22 32 hard yes yes yes
54 * Wellsburg (PCH) MS 0x8d7d 32 hard yes yes yes
55 * Wellsburg (PCH) MS 0x8d7e 32 hard yes yes yes
56 * Wellsburg (PCH) MS 0x8d7f 32 hard yes yes yes
57 * Coleto Creek (PCH) 0x23b0 32 hard yes yes yes
58 * Wildcat Point (PCH) 0x8ca2 32 hard yes yes yes
59 * Wildcat Point-LP (PCH) 0x9ca2 32 hard yes yes yes
60 * BayTrail (SOC) 0x0f12 32 hard yes yes yes
61 * Sunrise Point-H (PCH) 0xa123 32 hard yes yes yes
62 * Sunrise Point-LP (PCH) 0x9d23 32 hard yes yes yes
63 * DNV (SOC) 0x19df 32 hard yes yes yes
64 * Broxton (SOC) 0x5ad4 32 hard yes yes yes
65 * Lewisburg (PCH) 0xa1a3 32 hard yes yes yes
66 * Lewisburg Supersku (PCH) 0xa223 32 hard yes yes yes
67 * Kaby Lake PCH-H (PCH) 0xa2a3 32 hard yes yes yes
68 * Gemini Lake (SOC) 0x31d4 32 hard yes yes yes
69 * Cannon Lake-H (PCH) 0xa323 32 hard yes yes yes
70 * Cannon Lake-LP (PCH) 0x9da3 32 hard yes yes yes
71 * Cedar Fork (PCH) 0x18df 32 hard yes yes yes
72 *
73 * Features supported by this driver:
74 * Software PEC no
75 * Hardware PEC yes
76 * Block buffer yes
77 * Block process call transaction no
78 * I2C block read transaction yes (doesn't use the block buffer)
79 * Slave mode no
80 * SMBus Host Notify yes
81 * Interrupt processing yes
82 *
83 * See the file Documentation/i2c/busses/i2c-i801 for details.
84 */
85
86 #include <linux/interrupt.h>
87 #include <linux/module.h>
88 #include <linux/pci.h>
89 #include <linux/kernel.h>
90 #include <linux/stddef.h>
91 #include <linux/delay.h>
92 #include <linux/ioport.h>
93 #include <linux/init.h>
94 #include <linux/i2c.h>
95 #include <linux/i2c-smbus.h>
96 #include <linux/acpi.h>
97 #include <linux/io.h>
98 #include <linux/dmi.h>
99 #include <linux/slab.h>
100 #include <linux/wait.h>
101 #include <linux/err.h>
102 #include <linux/platform_device.h>
103 #include <linux/platform_data/itco_wdt.h>
104 #include <linux/pm_runtime.h>
105
106 #if IS_ENABLED(CONFIG_I2C_MUX_GPIO) && defined CONFIG_DMI
107 #include <linux/gpio.h>
108 #include <linux/i2c-mux-gpio.h>
109 #endif
110
111 /* I801 SMBus address offsets */
112 #define SMBHSTSTS(p) (0 + (p)->smba)
113 #define SMBHSTCNT(p) (2 + (p)->smba)
114 #define SMBHSTCMD(p) (3 + (p)->smba)
115 #define SMBHSTADD(p) (4 + (p)->smba)
116 #define SMBHSTDAT0(p) (5 + (p)->smba)
117 #define SMBHSTDAT1(p) (6 + (p)->smba)
118 #define SMBBLKDAT(p) (7 + (p)->smba)
119 #define SMBPEC(p) (8 + (p)->smba) /* ICH3 and later */
120 #define SMBAUXSTS(p) (12 + (p)->smba) /* ICH4 and later */
121 #define SMBAUXCTL(p) (13 + (p)->smba) /* ICH4 and later */
122 #define SMBSLVSTS(p) (16 + (p)->smba) /* ICH3 and later */
123 #define SMBSLVCMD(p) (17 + (p)->smba) /* ICH3 and later */
124 #define SMBNTFDADD(p) (20 + (p)->smba) /* ICH3 and later */
125
126 /* PCI Address Constants */
127 #define SMBBAR 4
128 #define SMBPCICTL 0x004
129 #define SMBPCISTS 0x006
130 #define SMBHSTCFG 0x040
131 #define TCOBASE 0x050
132 #define TCOCTL 0x054
133
134 #define ACPIBASE 0x040
135 #define ACPIBASE_SMI_OFF 0x030
136 #define ACPICTRL 0x044
137 #define ACPICTRL_EN 0x080
138
139 #define SBREG_BAR 0x10
140 #define SBREG_SMBCTRL 0xc6000c
141
142 /* Host status bits for SMBPCISTS */
143 #define SMBPCISTS_INTS BIT(3)
144
145 /* Control bits for SMBPCICTL */
146 #define SMBPCICTL_INTDIS BIT(10)
147
148 /* Host configuration bits for SMBHSTCFG */
149 #define SMBHSTCFG_HST_EN BIT(0)
150 #define SMBHSTCFG_SMB_SMI_EN BIT(1)
151 #define SMBHSTCFG_I2C_EN BIT(2)
152 #define SMBHSTCFG_SPD_WD BIT(4)
153
154 /* TCO configuration bits for TCOCTL */
155 #define TCOCTL_EN BIT(8)
156
157 /* Auxiliary status register bits, ICH4+ only */
158 #define SMBAUXSTS_CRCE BIT(0)
159 #define SMBAUXSTS_STCO BIT(1)
160
161 /* Auxiliary control register bits, ICH4+ only */
162 #define SMBAUXCTL_CRC BIT(0)
163 #define SMBAUXCTL_E32B BIT(1)
164
165 /* Other settings */
166 #define MAX_RETRIES 400
167
168 /* I801 command constants */
169 #define I801_QUICK 0x00
170 #define I801_BYTE 0x04
171 #define I801_BYTE_DATA 0x08
172 #define I801_WORD_DATA 0x0C
173 #define I801_PROC_CALL 0x10 /* unimplemented */
174 #define I801_BLOCK_DATA 0x14
175 #define I801_I2C_BLOCK_DATA 0x18 /* ICH5 and later */
176
177 /* I801 Host Control register bits */
178 #define SMBHSTCNT_INTREN BIT(0)
179 #define SMBHSTCNT_KILL BIT(1)
180 #define SMBHSTCNT_LAST_BYTE BIT(5)
181 #define SMBHSTCNT_START BIT(6)
182 #define SMBHSTCNT_PEC_EN BIT(7) /* ICH3 and later */
183
184 /* I801 Hosts Status register bits */
185 #define SMBHSTSTS_BYTE_DONE BIT(7)
186 #define SMBHSTSTS_INUSE_STS BIT(6)
187 #define SMBHSTSTS_SMBALERT_STS BIT(5)
188 #define SMBHSTSTS_FAILED BIT(4)
189 #define SMBHSTSTS_BUS_ERR BIT(3)
190 #define SMBHSTSTS_DEV_ERR BIT(2)
191 #define SMBHSTSTS_INTR BIT(1)
192 #define SMBHSTSTS_HOST_BUSY BIT(0)
193
194 /* Host Notify Status register bits */
195 #define SMBSLVSTS_HST_NTFY_STS BIT(0)
196
197 /* Host Notify Command register bits */
198 #define SMBSLVCMD_HST_NTFY_INTREN BIT(0)
199
200 #define STATUS_ERROR_FLAGS (SMBHSTSTS_FAILED | SMBHSTSTS_BUS_ERR | \
201 SMBHSTSTS_DEV_ERR)
202
203 #define STATUS_FLAGS (SMBHSTSTS_BYTE_DONE | SMBHSTSTS_INTR | \
204 STATUS_ERROR_FLAGS)
205
206 /* Older devices have their ID defined in <linux/pci_ids.h> */
207 #define PCI_DEVICE_ID_INTEL_BAYTRAIL_SMBUS 0x0f12
208 #define PCI_DEVICE_ID_INTEL_CDF_SMBUS 0x18df
209 #define PCI_DEVICE_ID_INTEL_DNV_SMBUS 0x19df
210 #define PCI_DEVICE_ID_INTEL_COUGARPOINT_SMBUS 0x1c22
211 #define PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS 0x1d22
212 /* Patsburg also has three 'Integrated Device Function' SMBus controllers */
213 #define PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF0 0x1d70
214 #define PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF1 0x1d71
215 #define PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF2 0x1d72
216 #define PCI_DEVICE_ID_INTEL_PANTHERPOINT_SMBUS 0x1e22
217 #define PCI_DEVICE_ID_INTEL_AVOTON_SMBUS 0x1f3c
218 #define PCI_DEVICE_ID_INTEL_BRASWELL_SMBUS 0x2292
219 #define PCI_DEVICE_ID_INTEL_DH89XXCC_SMBUS 0x2330
220 #define PCI_DEVICE_ID_INTEL_COLETOCREEK_SMBUS 0x23b0
221 #define PCI_DEVICE_ID_INTEL_GEMINILAKE_SMBUS 0x31d4
222 #define PCI_DEVICE_ID_INTEL_5_3400_SERIES_SMBUS 0x3b30
223 #define PCI_DEVICE_ID_INTEL_BROXTON_SMBUS 0x5ad4
224 #define PCI_DEVICE_ID_INTEL_LYNXPOINT_SMBUS 0x8c22
225 #define PCI_DEVICE_ID_INTEL_WILDCATPOINT_SMBUS 0x8ca2
226 #define PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS 0x8d22
227 #define PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS0 0x8d7d
228 #define PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS1 0x8d7e
229 #define PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS2 0x8d7f
230 #define PCI_DEVICE_ID_INTEL_LYNXPOINT_LP_SMBUS 0x9c22
231 #define PCI_DEVICE_ID_INTEL_WILDCATPOINT_LP_SMBUS 0x9ca2
232 #define PCI_DEVICE_ID_INTEL_SUNRISEPOINT_LP_SMBUS 0x9d23
233 #define PCI_DEVICE_ID_INTEL_CANNONLAKE_LP_SMBUS 0x9da3
234 #define PCI_DEVICE_ID_INTEL_SUNRISEPOINT_H_SMBUS 0xa123
235 #define PCI_DEVICE_ID_INTEL_LEWISBURG_SMBUS 0xa1a3
236 #define PCI_DEVICE_ID_INTEL_LEWISBURG_SSKU_SMBUS 0xa223
237 #define PCI_DEVICE_ID_INTEL_KABYLAKE_PCH_H_SMBUS 0xa2a3
238 #define PCI_DEVICE_ID_INTEL_CANNONLAKE_H_SMBUS 0xa323
239
240 struct i801_mux_config {
241 char *gpio_chip;
242 unsigned values[3];
243 int n_values;
244 unsigned classes[3];
245 unsigned gpios[2]; /* Relative to gpio_chip->base */
246 int n_gpios;
247 };
248
249 struct i801_priv {
250 struct i2c_adapter adapter;
251 unsigned long smba;
252 unsigned char original_hstcfg;
253 unsigned char original_slvcmd;
254 struct pci_dev *pci_dev;
255 unsigned int features;
256
257 /* isr processing */
258 wait_queue_head_t waitq;
259 u8 status;
260
261 /* Command state used by isr for byte-by-byte block transactions */
262 u8 cmd;
263 bool is_read;
264 int count;
265 int len;
266 u8 *data;
267
268 #if IS_ENABLED(CONFIG_I2C_MUX_GPIO) && defined CONFIG_DMI
269 const struct i801_mux_config *mux_drvdata;
270 struct platform_device *mux_pdev;
271 #endif
272 struct platform_device *tco_pdev;
273
274 /*
275 * If set to true the host controller registers are reserved for
276 * ACPI AML use. Protected by acpi_lock.
277 */
278 bool acpi_reserved;
279 struct mutex acpi_lock;
280 };
281
282 #define FEATURE_SMBUS_PEC BIT(0)
283 #define FEATURE_BLOCK_BUFFER BIT(1)
284 #define FEATURE_BLOCK_PROC BIT(2)
285 #define FEATURE_I2C_BLOCK_READ BIT(3)
286 #define FEATURE_IRQ BIT(4)
287 #define FEATURE_HOST_NOTIFY BIT(5)
288 /* Not really a feature, but it's convenient to handle it as such */
289 #define FEATURE_IDF BIT(15)
290 #define FEATURE_TCO BIT(16)
291
292 static const char *i801_feature_names[] = {
293 "SMBus PEC",
294 "Block buffer",
295 "Block process call",
296 "I2C block read",
297 "Interrupt",
298 "SMBus Host Notify",
299 };
300
301 static unsigned int disable_features;
302 module_param(disable_features, uint, S_IRUGO | S_IWUSR);
303 MODULE_PARM_DESC(disable_features, "Disable selected driver features:\n"
304 "\t\t 0x01 disable SMBus PEC\n"
305 "\t\t 0x02 disable the block buffer\n"
306 "\t\t 0x08 disable the I2C block read functionality\n"
307 "\t\t 0x10 don't use interrupts\n"
308 "\t\t 0x20 disable SMBus Host Notify ");
309
310 /* Make sure the SMBus host is ready to start transmitting.
311 Return 0 if it is, -EBUSY if it is not. */
312 static int i801_check_pre(struct i801_priv *priv)
313 {
314 int status;
315
316 status = inb_p(SMBHSTSTS(priv));
317 if (status & SMBHSTSTS_HOST_BUSY) {
318 dev_err(&priv->pci_dev->dev, "SMBus is busy, can't use it!\n");
319 return -EBUSY;
320 }
321
322 status &= STATUS_FLAGS;
323 if (status) {
324 dev_dbg(&priv->pci_dev->dev, "Clearing status flags (%02x)\n",
325 status);
326 outb_p(status, SMBHSTSTS(priv));
327 status = inb_p(SMBHSTSTS(priv)) & STATUS_FLAGS;
328 if (status) {
329 dev_err(&priv->pci_dev->dev,
330 "Failed clearing status flags (%02x)\n",
331 status);
332 return -EBUSY;
333 }
334 }
335
336 /*
337 * Clear CRC status if needed.
338 * During normal operation, i801_check_post() takes care
339 * of it after every operation. We do it here only in case
340 * the hardware was already in this state when the driver
341 * started.
342 */
343 if (priv->features & FEATURE_SMBUS_PEC) {
344 status = inb_p(SMBAUXSTS(priv)) & SMBAUXSTS_CRCE;
345 if (status) {
346 dev_dbg(&priv->pci_dev->dev,
347 "Clearing aux status flags (%02x)\n", status);
348 outb_p(status, SMBAUXSTS(priv));
349 status = inb_p(SMBAUXSTS(priv)) & SMBAUXSTS_CRCE;
350 if (status) {
351 dev_err(&priv->pci_dev->dev,
352 "Failed clearing aux status flags (%02x)\n",
353 status);
354 return -EBUSY;
355 }
356 }
357 }
358
359 return 0;
360 }
361
362 /*
363 * Convert the status register to an error code, and clear it.
364 * Note that status only contains the bits we want to clear, not the
365 * actual register value.
366 */
367 static int i801_check_post(struct i801_priv *priv, int status)
368 {
369 int result = 0;
370
371 /*
372 * If the SMBus is still busy, we give up
373 * Note: This timeout condition only happens when using polling
374 * transactions. For interrupt operation, NAK/timeout is indicated by
375 * DEV_ERR.
376 */
377 if (unlikely(status < 0)) {
378 dev_err(&priv->pci_dev->dev, "Transaction timeout\n");
379 /* try to stop the current command */
380 dev_dbg(&priv->pci_dev->dev, "Terminating the current operation\n");
381 outb_p(inb_p(SMBHSTCNT(priv)) | SMBHSTCNT_KILL,
382 SMBHSTCNT(priv));
383 usleep_range(1000, 2000);
384 outb_p(inb_p(SMBHSTCNT(priv)) & (~SMBHSTCNT_KILL),
385 SMBHSTCNT(priv));
386
387 /* Check if it worked */
388 status = inb_p(SMBHSTSTS(priv));
389 if ((status & SMBHSTSTS_HOST_BUSY) ||
390 !(status & SMBHSTSTS_FAILED))
391 dev_err(&priv->pci_dev->dev,
392 "Failed terminating the transaction\n");
393 outb_p(STATUS_FLAGS, SMBHSTSTS(priv));
394 return -ETIMEDOUT;
395 }
396
397 if (status & SMBHSTSTS_FAILED) {
398 result = -EIO;
399 dev_err(&priv->pci_dev->dev, "Transaction failed\n");
400 }
401 if (status & SMBHSTSTS_DEV_ERR) {
402 /*
403 * This may be a PEC error, check and clear it.
404 *
405 * AUXSTS is handled differently from HSTSTS.
406 * For HSTSTS, i801_isr() or i801_wait_intr()
407 * has already cleared the error bits in hardware,
408 * and we are passed a copy of the original value
409 * in "status".
410 * For AUXSTS, the hardware register is left
411 * for us to handle here.
412 * This is asymmetric, slightly iffy, but safe,
413 * since all this code is serialized and the CRCE
414 * bit is harmless as long as it's cleared before
415 * the next operation.
416 */
417 if ((priv->features & FEATURE_SMBUS_PEC) &&
418 (inb_p(SMBAUXSTS(priv)) & SMBAUXSTS_CRCE)) {
419 outb_p(SMBAUXSTS_CRCE, SMBAUXSTS(priv));
420 result = -EBADMSG;
421 dev_dbg(&priv->pci_dev->dev, "PEC error\n");
422 } else {
423 result = -ENXIO;
424 dev_dbg(&priv->pci_dev->dev, "No response\n");
425 }
426 }
427 if (status & SMBHSTSTS_BUS_ERR) {
428 result = -EAGAIN;
429 dev_dbg(&priv->pci_dev->dev, "Lost arbitration\n");
430 }
431
432 /* Clear status flags except BYTE_DONE, to be cleared by caller */
433 outb_p(status, SMBHSTSTS(priv));
434
435 return result;
436 }
437
438 /* Wait for BUSY being cleared and either INTR or an error flag being set */
439 static int i801_wait_intr(struct i801_priv *priv)
440 {
441 int timeout = 0;
442 int status;
443
444 /* We will always wait for a fraction of a second! */
445 do {
446 usleep_range(250, 500);
447 status = inb_p(SMBHSTSTS(priv));
448 } while (((status & SMBHSTSTS_HOST_BUSY) ||
449 !(status & (STATUS_ERROR_FLAGS | SMBHSTSTS_INTR))) &&
450 (timeout++ < MAX_RETRIES));
451
452 if (timeout > MAX_RETRIES) {
453 dev_dbg(&priv->pci_dev->dev, "INTR Timeout!\n");
454 return -ETIMEDOUT;
455 }
456 return status & (STATUS_ERROR_FLAGS | SMBHSTSTS_INTR);
457 }
458
459 /* Wait for either BYTE_DONE or an error flag being set */
460 static int i801_wait_byte_done(struct i801_priv *priv)
461 {
462 int timeout = 0;
463 int status;
464
465 /* We will always wait for a fraction of a second! */
466 do {
467 usleep_range(250, 500);
468 status = inb_p(SMBHSTSTS(priv));
469 } while (!(status & (STATUS_ERROR_FLAGS | SMBHSTSTS_BYTE_DONE)) &&
470 (timeout++ < MAX_RETRIES));
471
472 if (timeout > MAX_RETRIES) {
473 dev_dbg(&priv->pci_dev->dev, "BYTE_DONE Timeout!\n");
474 return -ETIMEDOUT;
475 }
476 return status & STATUS_ERROR_FLAGS;
477 }
478
479 static int i801_transaction(struct i801_priv *priv, int xact)
480 {
481 int status;
482 int result;
483 const struct i2c_adapter *adap = &priv->adapter;
484
485 result = i801_check_pre(priv);
486 if (result < 0)
487 return result;
488
489 if (priv->features & FEATURE_IRQ) {
490 outb_p(xact | SMBHSTCNT_INTREN | SMBHSTCNT_START,
491 SMBHSTCNT(priv));
492 result = wait_event_timeout(priv->waitq,
493 (status = priv->status),
494 adap->timeout);
495 if (!result) {
496 status = -ETIMEDOUT;
497 dev_warn(&priv->pci_dev->dev,
498 "Timeout waiting for interrupt!\n");
499 }
500 priv->status = 0;
501 return i801_check_post(priv, status);
502 }
503
504 /* the current contents of SMBHSTCNT can be overwritten, since PEC,
505 * SMBSCMD are passed in xact */
506 outb_p(xact | SMBHSTCNT_START, SMBHSTCNT(priv));
507
508 status = i801_wait_intr(priv);
509 return i801_check_post(priv, status);
510 }
511
512 static int i801_block_transaction_by_block(struct i801_priv *priv,
513 union i2c_smbus_data *data,
514 char read_write, int hwpec)
515 {
516 int i, len;
517 int status;
518
519 inb_p(SMBHSTCNT(priv)); /* reset the data buffer index */
520
521 /* Use 32-byte buffer to process this transaction */
522 if (read_write == I2C_SMBUS_WRITE) {
523 len = data->block[0];
524 outb_p(len, SMBHSTDAT0(priv));
525 for (i = 0; i < len; i++)
526 outb_p(data->block[i+1], SMBBLKDAT(priv));
527 }
528
529 status = i801_transaction(priv, I801_BLOCK_DATA |
530 (hwpec ? SMBHSTCNT_PEC_EN : 0));
531 if (status)
532 return status;
533
534 if (read_write == I2C_SMBUS_READ) {
535 len = inb_p(SMBHSTDAT0(priv));
536 if (len < 1 || len > I2C_SMBUS_BLOCK_MAX)
537 return -EPROTO;
538
539 data->block[0] = len;
540 for (i = 0; i < len; i++)
541 data->block[i + 1] = inb_p(SMBBLKDAT(priv));
542 }
543 return 0;
544 }
545
546 static void i801_isr_byte_done(struct i801_priv *priv)
547 {
548 if (priv->is_read) {
549 /* For SMBus block reads, length is received with first byte */
550 if (((priv->cmd & 0x1c) == I801_BLOCK_DATA) &&
551 (priv->count == 0)) {
552 priv->len = inb_p(SMBHSTDAT0(priv));
553 if (priv->len < 1 || priv->len > I2C_SMBUS_BLOCK_MAX) {
554 dev_err(&priv->pci_dev->dev,
555 "Illegal SMBus block read size %d\n",
556 priv->len);
557 /* FIXME: Recover */
558 priv->len = I2C_SMBUS_BLOCK_MAX;
559 } else {
560 dev_dbg(&priv->pci_dev->dev,
561 "SMBus block read size is %d\n",
562 priv->len);
563 }
564 priv->data[-1] = priv->len;
565 }
566
567 /* Read next byte */
568 if (priv->count < priv->len)
569 priv->data[priv->count++] = inb(SMBBLKDAT(priv));
570 else
571 dev_dbg(&priv->pci_dev->dev,
572 "Discarding extra byte on block read\n");
573
574 /* Set LAST_BYTE for last byte of read transaction */
575 if (priv->count == priv->len - 1)
576 outb_p(priv->cmd | SMBHSTCNT_LAST_BYTE,
577 SMBHSTCNT(priv));
578 } else if (priv->count < priv->len - 1) {
579 /* Write next byte, except for IRQ after last byte */
580 outb_p(priv->data[++priv->count], SMBBLKDAT(priv));
581 }
582
583 /* Clear BYTE_DONE to continue with next byte */
584 outb_p(SMBHSTSTS_BYTE_DONE, SMBHSTSTS(priv));
585 }
586
587 static irqreturn_t i801_host_notify_isr(struct i801_priv *priv)
588 {
589 unsigned short addr;
590
591 addr = inb_p(SMBNTFDADD(priv)) >> 1;
592
593 /*
594 * With the tested platforms, reading SMBNTFDDAT (22 + (p)->smba)
595 * always returns 0. Our current implementation doesn't provide
596 * data, so we just ignore it.
597 */
598 i2c_handle_smbus_host_notify(&priv->adapter, addr);
599
600 /* clear Host Notify bit and return */
601 outb_p(SMBSLVSTS_HST_NTFY_STS, SMBSLVSTS(priv));
602 return IRQ_HANDLED;
603 }
604
605 /*
606 * There are three kinds of interrupts:
607 *
608 * 1) i801 signals transaction completion with one of these interrupts:
609 * INTR - Success
610 * DEV_ERR - Invalid command, NAK or communication timeout
611 * BUS_ERR - SMI# transaction collision
612 * FAILED - transaction was canceled due to a KILL request
613 * When any of these occur, update ->status and wake up the waitq.
614 * ->status must be cleared before kicking off the next transaction.
615 *
616 * 2) For byte-by-byte (I2C read/write) transactions, one BYTE_DONE interrupt
617 * occurs for each byte of a byte-by-byte to prepare the next byte.
618 *
619 * 3) Host Notify interrupts
620 */
621 static irqreturn_t i801_isr(int irq, void *dev_id)
622 {
623 struct i801_priv *priv = dev_id;
624 u16 pcists;
625 u8 status;
626
627 /* Confirm this is our interrupt */
628 pci_read_config_word(priv->pci_dev, SMBPCISTS, &pcists);
629 if (!(pcists & SMBPCISTS_INTS))
630 return IRQ_NONE;
631
632 if (priv->features & FEATURE_HOST_NOTIFY) {
633 status = inb_p(SMBSLVSTS(priv));
634 if (status & SMBSLVSTS_HST_NTFY_STS)
635 return i801_host_notify_isr(priv);
636 }
637
638 status = inb_p(SMBHSTSTS(priv));
639 if (status & SMBHSTSTS_BYTE_DONE)
640 i801_isr_byte_done(priv);
641
642 /*
643 * Clear irq sources and report transaction result.
644 * ->status must be cleared before the next transaction is started.
645 */
646 status &= SMBHSTSTS_INTR | STATUS_ERROR_FLAGS;
647 if (status) {
648 outb_p(status, SMBHSTSTS(priv));
649 priv->status = status;
650 wake_up(&priv->waitq);
651 }
652
653 return IRQ_HANDLED;
654 }
655
656 /*
657 * For "byte-by-byte" block transactions:
658 * I2C write uses cmd=I801_BLOCK_DATA, I2C_EN=1
659 * I2C read uses cmd=I801_I2C_BLOCK_DATA
660 */
661 static int i801_block_transaction_byte_by_byte(struct i801_priv *priv,
662 union i2c_smbus_data *data,
663 char read_write, int command,
664 int hwpec)
665 {
666 int i, len;
667 int smbcmd;
668 int status;
669 int result;
670 const struct i2c_adapter *adap = &priv->adapter;
671
672 result = i801_check_pre(priv);
673 if (result < 0)
674 return result;
675
676 len = data->block[0];
677
678 if (read_write == I2C_SMBUS_WRITE) {
679 outb_p(len, SMBHSTDAT0(priv));
680 outb_p(data->block[1], SMBBLKDAT(priv));
681 }
682
683 if (command == I2C_SMBUS_I2C_BLOCK_DATA &&
684 read_write == I2C_SMBUS_READ)
685 smbcmd = I801_I2C_BLOCK_DATA;
686 else
687 smbcmd = I801_BLOCK_DATA;
688
689 if (priv->features & FEATURE_IRQ) {
690 priv->is_read = (read_write == I2C_SMBUS_READ);
691 if (len == 1 && priv->is_read)
692 smbcmd |= SMBHSTCNT_LAST_BYTE;
693 priv->cmd = smbcmd | SMBHSTCNT_INTREN;
694 priv->len = len;
695 priv->count = 0;
696 priv->data = &data->block[1];
697
698 outb_p(priv->cmd | SMBHSTCNT_START, SMBHSTCNT(priv));
699 result = wait_event_timeout(priv->waitq,
700 (status = priv->status),
701 adap->timeout);
702 if (!result) {
703 status = -ETIMEDOUT;
704 dev_warn(&priv->pci_dev->dev,
705 "Timeout waiting for interrupt!\n");
706 }
707 priv->status = 0;
708 return i801_check_post(priv, status);
709 }
710
711 for (i = 1; i <= len; i++) {
712 if (i == len && read_write == I2C_SMBUS_READ)
713 smbcmd |= SMBHSTCNT_LAST_BYTE;
714 outb_p(smbcmd, SMBHSTCNT(priv));
715
716 if (i == 1)
717 outb_p(inb(SMBHSTCNT(priv)) | SMBHSTCNT_START,
718 SMBHSTCNT(priv));
719
720 status = i801_wait_byte_done(priv);
721 if (status)
722 goto exit;
723
724 if (i == 1 && read_write == I2C_SMBUS_READ
725 && command != I2C_SMBUS_I2C_BLOCK_DATA) {
726 len = inb_p(SMBHSTDAT0(priv));
727 if (len < 1 || len > I2C_SMBUS_BLOCK_MAX) {
728 dev_err(&priv->pci_dev->dev,
729 "Illegal SMBus block read size %d\n",
730 len);
731 /* Recover */
732 while (inb_p(SMBHSTSTS(priv)) &
733 SMBHSTSTS_HOST_BUSY)
734 outb_p(SMBHSTSTS_BYTE_DONE,
735 SMBHSTSTS(priv));
736 outb_p(SMBHSTSTS_INTR, SMBHSTSTS(priv));
737 return -EPROTO;
738 }
739 data->block[0] = len;
740 }
741
742 /* Retrieve/store value in SMBBLKDAT */
743 if (read_write == I2C_SMBUS_READ)
744 data->block[i] = inb_p(SMBBLKDAT(priv));
745 if (read_write == I2C_SMBUS_WRITE && i+1 <= len)
746 outb_p(data->block[i+1], SMBBLKDAT(priv));
747
748 /* signals SMBBLKDAT ready */
749 outb_p(SMBHSTSTS_BYTE_DONE, SMBHSTSTS(priv));
750 }
751
752 status = i801_wait_intr(priv);
753 exit:
754 return i801_check_post(priv, status);
755 }
756
757 static int i801_set_block_buffer_mode(struct i801_priv *priv)
758 {
759 outb_p(inb_p(SMBAUXCTL(priv)) | SMBAUXCTL_E32B, SMBAUXCTL(priv));
760 if ((inb_p(SMBAUXCTL(priv)) & SMBAUXCTL_E32B) == 0)
761 return -EIO;
762 return 0;
763 }
764
765 /* Block transaction function */
766 static int i801_block_transaction(struct i801_priv *priv,
767 union i2c_smbus_data *data, char read_write,
768 int command, int hwpec)
769 {
770 int result = 0;
771 unsigned char hostc;
772
773 if (command == I2C_SMBUS_I2C_BLOCK_DATA) {
774 if (read_write == I2C_SMBUS_WRITE) {
775 /* set I2C_EN bit in configuration register */
776 pci_read_config_byte(priv->pci_dev, SMBHSTCFG, &hostc);
777 pci_write_config_byte(priv->pci_dev, SMBHSTCFG,
778 hostc | SMBHSTCFG_I2C_EN);
779 } else if (!(priv->features & FEATURE_I2C_BLOCK_READ)) {
780 dev_err(&priv->pci_dev->dev,
781 "I2C block read is unsupported!\n");
782 return -EOPNOTSUPP;
783 }
784 }
785
786 if (read_write == I2C_SMBUS_WRITE
787 || command == I2C_SMBUS_I2C_BLOCK_DATA) {
788 if (data->block[0] < 1)
789 data->block[0] = 1;
790 if (data->block[0] > I2C_SMBUS_BLOCK_MAX)
791 data->block[0] = I2C_SMBUS_BLOCK_MAX;
792 } else {
793 data->block[0] = 32; /* max for SMBus block reads */
794 }
795
796 /* Experience has shown that the block buffer can only be used for
797 SMBus (not I2C) block transactions, even though the datasheet
798 doesn't mention this limitation. */
799 if ((priv->features & FEATURE_BLOCK_BUFFER)
800 && command != I2C_SMBUS_I2C_BLOCK_DATA
801 && i801_set_block_buffer_mode(priv) == 0)
802 result = i801_block_transaction_by_block(priv, data,
803 read_write, hwpec);
804 else
805 result = i801_block_transaction_byte_by_byte(priv, data,
806 read_write,
807 command, hwpec);
808
809 if (command == I2C_SMBUS_I2C_BLOCK_DATA
810 && read_write == I2C_SMBUS_WRITE) {
811 /* restore saved configuration register value */
812 pci_write_config_byte(priv->pci_dev, SMBHSTCFG, hostc);
813 }
814 return result;
815 }
816
817 /* Return negative errno on error. */
818 static s32 i801_access(struct i2c_adapter *adap, u16 addr,
819 unsigned short flags, char read_write, u8 command,
820 int size, union i2c_smbus_data *data)
821 {
822 int hwpec;
823 int block = 0;
824 int ret = 0, xact = 0;
825 struct i801_priv *priv = i2c_get_adapdata(adap);
826
827 mutex_lock(&priv->acpi_lock);
828 if (priv->acpi_reserved) {
829 mutex_unlock(&priv->acpi_lock);
830 return -EBUSY;
831 }
832
833 pm_runtime_get_sync(&priv->pci_dev->dev);
834
835 hwpec = (priv->features & FEATURE_SMBUS_PEC) && (flags & I2C_CLIENT_PEC)
836 && size != I2C_SMBUS_QUICK
837 && size != I2C_SMBUS_I2C_BLOCK_DATA;
838
839 switch (size) {
840 case I2C_SMBUS_QUICK:
841 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
842 SMBHSTADD(priv));
843 xact = I801_QUICK;
844 break;
845 case I2C_SMBUS_BYTE:
846 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
847 SMBHSTADD(priv));
848 if (read_write == I2C_SMBUS_WRITE)
849 outb_p(command, SMBHSTCMD(priv));
850 xact = I801_BYTE;
851 break;
852 case I2C_SMBUS_BYTE_DATA:
853 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
854 SMBHSTADD(priv));
855 outb_p(command, SMBHSTCMD(priv));
856 if (read_write == I2C_SMBUS_WRITE)
857 outb_p(data->byte, SMBHSTDAT0(priv));
858 xact = I801_BYTE_DATA;
859 break;
860 case I2C_SMBUS_WORD_DATA:
861 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
862 SMBHSTADD(priv));
863 outb_p(command, SMBHSTCMD(priv));
864 if (read_write == I2C_SMBUS_WRITE) {
865 outb_p(data->word & 0xff, SMBHSTDAT0(priv));
866 outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1(priv));
867 }
868 xact = I801_WORD_DATA;
869 break;
870 case I2C_SMBUS_BLOCK_DATA:
871 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
872 SMBHSTADD(priv));
873 outb_p(command, SMBHSTCMD(priv));
874 block = 1;
875 break;
876 case I2C_SMBUS_I2C_BLOCK_DATA:
877 /*
878 * NB: page 240 of ICH5 datasheet shows that the R/#W
879 * bit should be cleared here, even when reading.
880 * However if SPD Write Disable is set (Lynx Point and later),
881 * the read will fail if we don't set the R/#W bit.
882 */
883 outb_p(((addr & 0x7f) << 1) |
884 ((priv->original_hstcfg & SMBHSTCFG_SPD_WD) ?
885 (read_write & 0x01) : 0),
886 SMBHSTADD(priv));
887 if (read_write == I2C_SMBUS_READ) {
888 /* NB: page 240 of ICH5 datasheet also shows
889 * that DATA1 is the cmd field when reading */
890 outb_p(command, SMBHSTDAT1(priv));
891 } else
892 outb_p(command, SMBHSTCMD(priv));
893 block = 1;
894 break;
895 default:
896 dev_err(&priv->pci_dev->dev, "Unsupported transaction %d\n",
897 size);
898 ret = -EOPNOTSUPP;
899 goto out;
900 }
901
902 if (hwpec) /* enable/disable hardware PEC */
903 outb_p(inb_p(SMBAUXCTL(priv)) | SMBAUXCTL_CRC, SMBAUXCTL(priv));
904 else
905 outb_p(inb_p(SMBAUXCTL(priv)) & (~SMBAUXCTL_CRC),
906 SMBAUXCTL(priv));
907
908 if (block)
909 ret = i801_block_transaction(priv, data, read_write, size,
910 hwpec);
911 else
912 ret = i801_transaction(priv, xact);
913
914 /* Some BIOSes don't like it when PEC is enabled at reboot or resume
915 time, so we forcibly disable it after every transaction. Turn off
916 E32B for the same reason. */
917 if (hwpec || block)
918 outb_p(inb_p(SMBAUXCTL(priv)) &
919 ~(SMBAUXCTL_CRC | SMBAUXCTL_E32B), SMBAUXCTL(priv));
920
921 if (block)
922 goto out;
923 if (ret)
924 goto out;
925 if ((read_write == I2C_SMBUS_WRITE) || (xact == I801_QUICK))
926 goto out;
927
928 switch (xact & 0x7f) {
929 case I801_BYTE: /* Result put in SMBHSTDAT0 */
930 case I801_BYTE_DATA:
931 data->byte = inb_p(SMBHSTDAT0(priv));
932 break;
933 case I801_WORD_DATA:
934 data->word = inb_p(SMBHSTDAT0(priv)) +
935 (inb_p(SMBHSTDAT1(priv)) << 8);
936 break;
937 }
938
939 out:
940 pm_runtime_mark_last_busy(&priv->pci_dev->dev);
941 pm_runtime_put_autosuspend(&priv->pci_dev->dev);
942 mutex_unlock(&priv->acpi_lock);
943 return ret;
944 }
945
946
947 static u32 i801_func(struct i2c_adapter *adapter)
948 {
949 struct i801_priv *priv = i2c_get_adapdata(adapter);
950
951 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
952 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
953 I2C_FUNC_SMBUS_BLOCK_DATA | I2C_FUNC_SMBUS_WRITE_I2C_BLOCK |
954 ((priv->features & FEATURE_SMBUS_PEC) ? I2C_FUNC_SMBUS_PEC : 0) |
955 ((priv->features & FEATURE_I2C_BLOCK_READ) ?
956 I2C_FUNC_SMBUS_READ_I2C_BLOCK : 0) |
957 ((priv->features & FEATURE_HOST_NOTIFY) ?
958 I2C_FUNC_SMBUS_HOST_NOTIFY : 0);
959 }
960
961 static void i801_enable_host_notify(struct i2c_adapter *adapter)
962 {
963 struct i801_priv *priv = i2c_get_adapdata(adapter);
964
965 if (!(priv->features & FEATURE_HOST_NOTIFY))
966 return;
967
968 priv->original_slvcmd = inb_p(SMBSLVCMD(priv));
969
970 if (!(SMBSLVCMD_HST_NTFY_INTREN & priv->original_slvcmd))
971 outb_p(SMBSLVCMD_HST_NTFY_INTREN | priv->original_slvcmd,
972 SMBSLVCMD(priv));
973
974 /* clear Host Notify bit to allow a new notification */
975 outb_p(SMBSLVSTS_HST_NTFY_STS, SMBSLVSTS(priv));
976 }
977
978 static void i801_disable_host_notify(struct i801_priv *priv)
979 {
980 if (!(priv->features & FEATURE_HOST_NOTIFY))
981 return;
982
983 outb_p(priv->original_slvcmd, SMBSLVCMD(priv));
984 }
985
986 static const struct i2c_algorithm smbus_algorithm = {
987 .smbus_xfer = i801_access,
988 .functionality = i801_func,
989 };
990
991 static const struct pci_device_id i801_ids[] = {
992 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801AA_3) },
993 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801AB_3) },
994 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801BA_2) },
995 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_3) },
996 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_3) },
997 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_3) },
998 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB_4) },
999 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_16) },
1000 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_17) },
1001 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB2_17) },
1002 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH8_5) },
1003 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH9_6) },
1004 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_EP80579_1) },
1005 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH10_4) },
1006 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH10_5) },
1007 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_5_3400_SERIES_SMBUS) },
1008 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_COUGARPOINT_SMBUS) },
1009 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS) },
1010 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF0) },
1011 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF1) },
1012 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF2) },
1013 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_DH89XXCC_SMBUS) },
1014 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_PANTHERPOINT_SMBUS) },
1015 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_LYNXPOINT_SMBUS) },
1016 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_LYNXPOINT_LP_SMBUS) },
1017 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_AVOTON_SMBUS) },
1018 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS) },
1019 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS0) },
1020 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS1) },
1021 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS2) },
1022 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_COLETOCREEK_SMBUS) },
1023 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_GEMINILAKE_SMBUS) },
1024 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_WILDCATPOINT_SMBUS) },
1025 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_WILDCATPOINT_LP_SMBUS) },
1026 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_BAYTRAIL_SMBUS) },
1027 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_BRASWELL_SMBUS) },
1028 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_SUNRISEPOINT_H_SMBUS) },
1029 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_SUNRISEPOINT_LP_SMBUS) },
1030 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_CDF_SMBUS) },
1031 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_DNV_SMBUS) },
1032 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_BROXTON_SMBUS) },
1033 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_LEWISBURG_SMBUS) },
1034 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_LEWISBURG_SSKU_SMBUS) },
1035 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_KABYLAKE_PCH_H_SMBUS) },
1036 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_CANNONLAKE_H_SMBUS) },
1037 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_CANNONLAKE_LP_SMBUS) },
1038 { 0, }
1039 };
1040
1041 MODULE_DEVICE_TABLE(pci, i801_ids);
1042
1043 #if defined CONFIG_X86 && defined CONFIG_DMI
1044 static unsigned char apanel_addr;
1045
1046 /* Scan the system ROM for the signature "FJKEYINF" */
1047 static __init const void __iomem *bios_signature(const void __iomem *bios)
1048 {
1049 ssize_t offset;
1050 const unsigned char signature[] = "FJKEYINF";
1051
1052 for (offset = 0; offset < 0x10000; offset += 0x10) {
1053 if (check_signature(bios + offset, signature,
1054 sizeof(signature)-1))
1055 return bios + offset;
1056 }
1057 return NULL;
1058 }
1059
1060 static void __init input_apanel_init(void)
1061 {
1062 void __iomem *bios;
1063 const void __iomem *p;
1064
1065 bios = ioremap(0xF0000, 0x10000); /* Can't fail */
1066 p = bios_signature(bios);
1067 if (p) {
1068 /* just use the first address */
1069 apanel_addr = readb(p + 8 + 3) >> 1;
1070 }
1071 iounmap(bios);
1072 }
1073
1074 struct dmi_onboard_device_info {
1075 const char *name;
1076 u8 type;
1077 unsigned short i2c_addr;
1078 const char *i2c_type;
1079 };
1080
1081 static const struct dmi_onboard_device_info dmi_devices[] = {
1082 { "Syleus", DMI_DEV_TYPE_OTHER, 0x73, "fscsyl" },
1083 { "Hermes", DMI_DEV_TYPE_OTHER, 0x73, "fscher" },
1084 { "Hades", DMI_DEV_TYPE_OTHER, 0x73, "fschds" },
1085 };
1086
1087 static void dmi_check_onboard_device(u8 type, const char *name,
1088 struct i2c_adapter *adap)
1089 {
1090 int i;
1091 struct i2c_board_info info;
1092
1093 for (i = 0; i < ARRAY_SIZE(dmi_devices); i++) {
1094 /* & ~0x80, ignore enabled/disabled bit */
1095 if ((type & ~0x80) != dmi_devices[i].type)
1096 continue;
1097 if (strcasecmp(name, dmi_devices[i].name))
1098 continue;
1099
1100 memset(&info, 0, sizeof(struct i2c_board_info));
1101 info.addr = dmi_devices[i].i2c_addr;
1102 strlcpy(info.type, dmi_devices[i].i2c_type, I2C_NAME_SIZE);
1103 i2c_new_device(adap, &info);
1104 break;
1105 }
1106 }
1107
1108 /* We use our own function to check for onboard devices instead of
1109 dmi_find_device() as some buggy BIOS's have the devices we are interested
1110 in marked as disabled */
1111 static void dmi_check_onboard_devices(const struct dmi_header *dm, void *adap)
1112 {
1113 int i, count;
1114
1115 if (dm->type != 10)
1116 return;
1117
1118 count = (dm->length - sizeof(struct dmi_header)) / 2;
1119 for (i = 0; i < count; i++) {
1120 const u8 *d = (char *)(dm + 1) + (i * 2);
1121 const char *name = ((char *) dm) + dm->length;
1122 u8 type = d[0];
1123 u8 s = d[1];
1124
1125 if (!s)
1126 continue;
1127 s--;
1128 while (s > 0 && name[0]) {
1129 name += strlen(name) + 1;
1130 s--;
1131 }
1132 if (name[0] == 0) /* Bogus string reference */
1133 continue;
1134
1135 dmi_check_onboard_device(type, name, adap);
1136 }
1137 }
1138
1139 /* Register optional slaves */
1140 static void i801_probe_optional_slaves(struct i801_priv *priv)
1141 {
1142 /* Only register slaves on main SMBus channel */
1143 if (priv->features & FEATURE_IDF)
1144 return;
1145
1146 if (apanel_addr) {
1147 struct i2c_board_info info;
1148
1149 memset(&info, 0, sizeof(struct i2c_board_info));
1150 info.addr = apanel_addr;
1151 strlcpy(info.type, "fujitsu_apanel", I2C_NAME_SIZE);
1152 i2c_new_device(&priv->adapter, &info);
1153 }
1154
1155 if (dmi_name_in_vendors("FUJITSU"))
1156 dmi_walk(dmi_check_onboard_devices, &priv->adapter);
1157 }
1158 #else
1159 static void __init input_apanel_init(void) {}
1160 static void i801_probe_optional_slaves(struct i801_priv *priv) {}
1161 #endif /* CONFIG_X86 && CONFIG_DMI */
1162
1163 #if IS_ENABLED(CONFIG_I2C_MUX_GPIO) && defined CONFIG_DMI
1164 static struct i801_mux_config i801_mux_config_asus_z8_d12 = {
1165 .gpio_chip = "gpio_ich",
1166 .values = { 0x02, 0x03 },
1167 .n_values = 2,
1168 .classes = { I2C_CLASS_SPD, I2C_CLASS_SPD },
1169 .gpios = { 52, 53 },
1170 .n_gpios = 2,
1171 };
1172
1173 static struct i801_mux_config i801_mux_config_asus_z8_d18 = {
1174 .gpio_chip = "gpio_ich",
1175 .values = { 0x02, 0x03, 0x01 },
1176 .n_values = 3,
1177 .classes = { I2C_CLASS_SPD, I2C_CLASS_SPD, I2C_CLASS_SPD },
1178 .gpios = { 52, 53 },
1179 .n_gpios = 2,
1180 };
1181
1182 static const struct dmi_system_id mux_dmi_table[] = {
1183 {
1184 .matches = {
1185 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1186 DMI_MATCH(DMI_BOARD_NAME, "Z8NA-D6(C)"),
1187 },
1188 .driver_data = &i801_mux_config_asus_z8_d12,
1189 },
1190 {
1191 .matches = {
1192 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1193 DMI_MATCH(DMI_BOARD_NAME, "Z8P(N)E-D12(X)"),
1194 },
1195 .driver_data = &i801_mux_config_asus_z8_d12,
1196 },
1197 {
1198 .matches = {
1199 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1200 DMI_MATCH(DMI_BOARD_NAME, "Z8NH-D12"),
1201 },
1202 .driver_data = &i801_mux_config_asus_z8_d12,
1203 },
1204 {
1205 .matches = {
1206 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1207 DMI_MATCH(DMI_BOARD_NAME, "Z8PH-D12/IFB"),
1208 },
1209 .driver_data = &i801_mux_config_asus_z8_d12,
1210 },
1211 {
1212 .matches = {
1213 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1214 DMI_MATCH(DMI_BOARD_NAME, "Z8NR-D12"),
1215 },
1216 .driver_data = &i801_mux_config_asus_z8_d12,
1217 },
1218 {
1219 .matches = {
1220 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1221 DMI_MATCH(DMI_BOARD_NAME, "Z8P(N)H-D12"),
1222 },
1223 .driver_data = &i801_mux_config_asus_z8_d12,
1224 },
1225 {
1226 .matches = {
1227 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1228 DMI_MATCH(DMI_BOARD_NAME, "Z8PG-D18"),
1229 },
1230 .driver_data = &i801_mux_config_asus_z8_d18,
1231 },
1232 {
1233 .matches = {
1234 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1235 DMI_MATCH(DMI_BOARD_NAME, "Z8PE-D18"),
1236 },
1237 .driver_data = &i801_mux_config_asus_z8_d18,
1238 },
1239 {
1240 .matches = {
1241 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1242 DMI_MATCH(DMI_BOARD_NAME, "Z8PS-D12"),
1243 },
1244 .driver_data = &i801_mux_config_asus_z8_d12,
1245 },
1246 { }
1247 };
1248
1249 /* Setup multiplexing if needed */
1250 static int i801_add_mux(struct i801_priv *priv)
1251 {
1252 struct device *dev = &priv->adapter.dev;
1253 const struct i801_mux_config *mux_config;
1254 struct i2c_mux_gpio_platform_data gpio_data;
1255 int err;
1256
1257 if (!priv->mux_drvdata)
1258 return 0;
1259 mux_config = priv->mux_drvdata;
1260
1261 /* Prepare the platform data */
1262 memset(&gpio_data, 0, sizeof(struct i2c_mux_gpio_platform_data));
1263 gpio_data.parent = priv->adapter.nr;
1264 gpio_data.values = mux_config->values;
1265 gpio_data.n_values = mux_config->n_values;
1266 gpio_data.classes = mux_config->classes;
1267 gpio_data.gpio_chip = mux_config->gpio_chip;
1268 gpio_data.gpios = mux_config->gpios;
1269 gpio_data.n_gpios = mux_config->n_gpios;
1270 gpio_data.idle = I2C_MUX_GPIO_NO_IDLE;
1271
1272 /* Register the mux device */
1273 priv->mux_pdev = platform_device_register_data(dev, "i2c-mux-gpio",
1274 PLATFORM_DEVID_AUTO, &gpio_data,
1275 sizeof(struct i2c_mux_gpio_platform_data));
1276 if (IS_ERR(priv->mux_pdev)) {
1277 err = PTR_ERR(priv->mux_pdev);
1278 priv->mux_pdev = NULL;
1279 dev_err(dev, "Failed to register i2c-mux-gpio device\n");
1280 return err;
1281 }
1282
1283 return 0;
1284 }
1285
1286 static void i801_del_mux(struct i801_priv *priv)
1287 {
1288 if (priv->mux_pdev)
1289 platform_device_unregister(priv->mux_pdev);
1290 }
1291
1292 static unsigned int i801_get_adapter_class(struct i801_priv *priv)
1293 {
1294 const struct dmi_system_id *id;
1295 const struct i801_mux_config *mux_config;
1296 unsigned int class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
1297 int i;
1298
1299 id = dmi_first_match(mux_dmi_table);
1300 if (id) {
1301 /* Remove branch classes from trunk */
1302 mux_config = id->driver_data;
1303 for (i = 0; i < mux_config->n_values; i++)
1304 class &= ~mux_config->classes[i];
1305
1306 /* Remember for later */
1307 priv->mux_drvdata = mux_config;
1308 }
1309
1310 return class;
1311 }
1312 #else
1313 static inline int i801_add_mux(struct i801_priv *priv) { return 0; }
1314 static inline void i801_del_mux(struct i801_priv *priv) { }
1315
1316 static inline unsigned int i801_get_adapter_class(struct i801_priv *priv)
1317 {
1318 return I2C_CLASS_HWMON | I2C_CLASS_SPD;
1319 }
1320 #endif
1321
1322 static const struct itco_wdt_platform_data tco_platform_data = {
1323 .name = "Intel PCH",
1324 .version = 4,
1325 };
1326
1327 static DEFINE_SPINLOCK(p2sb_spinlock);
1328
1329 static void i801_add_tco(struct i801_priv *priv)
1330 {
1331 struct pci_dev *pci_dev = priv->pci_dev;
1332 struct resource tco_res[3], *res;
1333 struct platform_device *pdev;
1334 unsigned int devfn;
1335 u32 tco_base, tco_ctl;
1336 u32 base_addr, ctrl_val;
1337 u64 base64_addr;
1338 u8 hidden;
1339
1340 if (!(priv->features & FEATURE_TCO))
1341 return;
1342
1343 pci_read_config_dword(pci_dev, TCOBASE, &tco_base);
1344 pci_read_config_dword(pci_dev, TCOCTL, &tco_ctl);
1345 if (!(tco_ctl & TCOCTL_EN))
1346 return;
1347
1348 memset(tco_res, 0, sizeof(tco_res));
1349
1350 res = &tco_res[ICH_RES_IO_TCO];
1351 res->start = tco_base & ~1;
1352 res->end = res->start + 32 - 1;
1353 res->flags = IORESOURCE_IO;
1354
1355 /*
1356 * Power Management registers.
1357 */
1358 devfn = PCI_DEVFN(PCI_SLOT(pci_dev->devfn), 2);
1359 pci_bus_read_config_dword(pci_dev->bus, devfn, ACPIBASE, &base_addr);
1360
1361 res = &tco_res[ICH_RES_IO_SMI];
1362 res->start = (base_addr & ~1) + ACPIBASE_SMI_OFF;
1363 res->end = res->start + 3;
1364 res->flags = IORESOURCE_IO;
1365
1366 /*
1367 * Enable the ACPI I/O space.
1368 */
1369 pci_bus_read_config_dword(pci_dev->bus, devfn, ACPICTRL, &ctrl_val);
1370 ctrl_val |= ACPICTRL_EN;
1371 pci_bus_write_config_dword(pci_dev->bus, devfn, ACPICTRL, ctrl_val);
1372
1373 /*
1374 * We must access the NO_REBOOT bit over the Primary to Sideband
1375 * bridge (P2SB). The BIOS prevents the P2SB device from being
1376 * enumerated by the PCI subsystem, so we need to unhide/hide it
1377 * to lookup the P2SB BAR.
1378 */
1379 spin_lock(&p2sb_spinlock);
1380
1381 devfn = PCI_DEVFN(PCI_SLOT(pci_dev->devfn), 1);
1382
1383 /* Unhide the P2SB device, if it is hidden */
1384 pci_bus_read_config_byte(pci_dev->bus, devfn, 0xe1, &hidden);
1385 if (hidden)
1386 pci_bus_write_config_byte(pci_dev->bus, devfn, 0xe1, 0x0);
1387
1388 pci_bus_read_config_dword(pci_dev->bus, devfn, SBREG_BAR, &base_addr);
1389 base64_addr = base_addr & 0xfffffff0;
1390
1391 pci_bus_read_config_dword(pci_dev->bus, devfn, SBREG_BAR + 0x4, &base_addr);
1392 base64_addr |= (u64)base_addr << 32;
1393
1394 /* Hide the P2SB device, if it was hidden before */
1395 if (hidden)
1396 pci_bus_write_config_byte(pci_dev->bus, devfn, 0xe1, hidden);
1397 spin_unlock(&p2sb_spinlock);
1398
1399 res = &tco_res[ICH_RES_MEM_OFF];
1400 res->start = (resource_size_t)base64_addr + SBREG_SMBCTRL;
1401 res->end = res->start + 3;
1402 res->flags = IORESOURCE_MEM;
1403
1404 pdev = platform_device_register_resndata(&pci_dev->dev, "iTCO_wdt", -1,
1405 tco_res, 3, &tco_platform_data,
1406 sizeof(tco_platform_data));
1407 if (IS_ERR(pdev)) {
1408 dev_warn(&pci_dev->dev, "failed to create iTCO device\n");
1409 return;
1410 }
1411
1412 priv->tco_pdev = pdev;
1413 }
1414
1415 #ifdef CONFIG_ACPI
1416 static acpi_status
1417 i801_acpi_io_handler(u32 function, acpi_physical_address address, u32 bits,
1418 u64 *value, void *handler_context, void *region_context)
1419 {
1420 struct i801_priv *priv = handler_context;
1421 struct pci_dev *pdev = priv->pci_dev;
1422 acpi_status status;
1423
1424 /*
1425 * Once BIOS AML code touches the OpRegion we warn and inhibit any
1426 * further access from the driver itself. This device is now owned
1427 * by the system firmware.
1428 */
1429 mutex_lock(&priv->acpi_lock);
1430
1431 if (!priv->acpi_reserved) {
1432 priv->acpi_reserved = true;
1433
1434 dev_warn(&pdev->dev, "BIOS is accessing SMBus registers\n");
1435 dev_warn(&pdev->dev, "Driver SMBus register access inhibited\n");
1436
1437 /*
1438 * BIOS is accessing the host controller so prevent it from
1439 * suspending automatically from now on.
1440 */
1441 pm_runtime_get_sync(&pdev->dev);
1442 }
1443
1444 if ((function & ACPI_IO_MASK) == ACPI_READ)
1445 status = acpi_os_read_port(address, (u32 *)value, bits);
1446 else
1447 status = acpi_os_write_port(address, (u32)*value, bits);
1448
1449 mutex_unlock(&priv->acpi_lock);
1450
1451 return status;
1452 }
1453
1454 static int i801_acpi_probe(struct i801_priv *priv)
1455 {
1456 struct acpi_device *adev;
1457 acpi_status status;
1458
1459 adev = ACPI_COMPANION(&priv->pci_dev->dev);
1460 if (adev) {
1461 status = acpi_install_address_space_handler(adev->handle,
1462 ACPI_ADR_SPACE_SYSTEM_IO, i801_acpi_io_handler,
1463 NULL, priv);
1464 if (ACPI_SUCCESS(status))
1465 return 0;
1466 }
1467
1468 return acpi_check_resource_conflict(&priv->pci_dev->resource[SMBBAR]);
1469 }
1470
1471 static void i801_acpi_remove(struct i801_priv *priv)
1472 {
1473 struct acpi_device *adev;
1474
1475 adev = ACPI_COMPANION(&priv->pci_dev->dev);
1476 if (!adev)
1477 return;
1478
1479 acpi_remove_address_space_handler(adev->handle,
1480 ACPI_ADR_SPACE_SYSTEM_IO, i801_acpi_io_handler);
1481
1482 mutex_lock(&priv->acpi_lock);
1483 if (priv->acpi_reserved)
1484 pm_runtime_put(&priv->pci_dev->dev);
1485 mutex_unlock(&priv->acpi_lock);
1486 }
1487 #else
1488 static inline int i801_acpi_probe(struct i801_priv *priv) { return 0; }
1489 static inline void i801_acpi_remove(struct i801_priv *priv) { }
1490 #endif
1491
1492 static int i801_probe(struct pci_dev *dev, const struct pci_device_id *id)
1493 {
1494 unsigned char temp;
1495 int err, i;
1496 struct i801_priv *priv;
1497
1498 priv = devm_kzalloc(&dev->dev, sizeof(*priv), GFP_KERNEL);
1499 if (!priv)
1500 return -ENOMEM;
1501
1502 i2c_set_adapdata(&priv->adapter, priv);
1503 priv->adapter.owner = THIS_MODULE;
1504 priv->adapter.class = i801_get_adapter_class(priv);
1505 priv->adapter.algo = &smbus_algorithm;
1506 priv->adapter.dev.parent = &dev->dev;
1507 ACPI_COMPANION_SET(&priv->adapter.dev, ACPI_COMPANION(&dev->dev));
1508 priv->adapter.retries = 3;
1509 mutex_init(&priv->acpi_lock);
1510
1511 priv->pci_dev = dev;
1512 switch (dev->device) {
1513 case PCI_DEVICE_ID_INTEL_SUNRISEPOINT_H_SMBUS:
1514 case PCI_DEVICE_ID_INTEL_SUNRISEPOINT_LP_SMBUS:
1515 case PCI_DEVICE_ID_INTEL_CANNONLAKE_H_SMBUS:
1516 case PCI_DEVICE_ID_INTEL_CANNONLAKE_LP_SMBUS:
1517 case PCI_DEVICE_ID_INTEL_LEWISBURG_SMBUS:
1518 case PCI_DEVICE_ID_INTEL_LEWISBURG_SSKU_SMBUS:
1519 case PCI_DEVICE_ID_INTEL_CDF_SMBUS:
1520 case PCI_DEVICE_ID_INTEL_DNV_SMBUS:
1521 case PCI_DEVICE_ID_INTEL_KABYLAKE_PCH_H_SMBUS:
1522 priv->features |= FEATURE_I2C_BLOCK_READ;
1523 priv->features |= FEATURE_IRQ;
1524 priv->features |= FEATURE_SMBUS_PEC;
1525 priv->features |= FEATURE_BLOCK_BUFFER;
1526 /* If we have ACPI based watchdog use that instead */
1527 if (!acpi_has_watchdog())
1528 priv->features |= FEATURE_TCO;
1529 priv->features |= FEATURE_HOST_NOTIFY;
1530 break;
1531
1532 case PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF0:
1533 case PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF1:
1534 case PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF2:
1535 case PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS0:
1536 case PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS1:
1537 case PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS2:
1538 priv->features |= FEATURE_IDF;
1539 /* fall through */
1540 default:
1541 priv->features |= FEATURE_I2C_BLOCK_READ;
1542 priv->features |= FEATURE_IRQ;
1543 /* fall through */
1544 case PCI_DEVICE_ID_INTEL_82801DB_3:
1545 priv->features |= FEATURE_SMBUS_PEC;
1546 priv->features |= FEATURE_BLOCK_BUFFER;
1547 /* fall through */
1548 case PCI_DEVICE_ID_INTEL_82801CA_3:
1549 priv->features |= FEATURE_HOST_NOTIFY;
1550 /* fall through */
1551 case PCI_DEVICE_ID_INTEL_82801BA_2:
1552 case PCI_DEVICE_ID_INTEL_82801AB_3:
1553 case PCI_DEVICE_ID_INTEL_82801AA_3:
1554 break;
1555 }
1556
1557 /* Disable features on user request */
1558 for (i = 0; i < ARRAY_SIZE(i801_feature_names); i++) {
1559 if (priv->features & disable_features & (1 << i))
1560 dev_notice(&dev->dev, "%s disabled by user\n",
1561 i801_feature_names[i]);
1562 }
1563 priv->features &= ~disable_features;
1564
1565 err = pcim_enable_device(dev);
1566 if (err) {
1567 dev_err(&dev->dev, "Failed to enable SMBus PCI device (%d)\n",
1568 err);
1569 return err;
1570 }
1571 pcim_pin_device(dev);
1572
1573 /* Determine the address of the SMBus area */
1574 priv->smba = pci_resource_start(dev, SMBBAR);
1575 if (!priv->smba) {
1576 dev_err(&dev->dev,
1577 "SMBus base address uninitialized, upgrade BIOS\n");
1578 return -ENODEV;
1579 }
1580
1581 if (i801_acpi_probe(priv))
1582 return -ENODEV;
1583
1584 err = pcim_iomap_regions(dev, 1 << SMBBAR,
1585 dev_driver_string(&dev->dev));
1586 if (err) {
1587 dev_err(&dev->dev,
1588 "Failed to request SMBus region 0x%lx-0x%Lx\n",
1589 priv->smba,
1590 (unsigned long long)pci_resource_end(dev, SMBBAR));
1591 i801_acpi_remove(priv);
1592 return err;
1593 }
1594
1595 pci_read_config_byte(priv->pci_dev, SMBHSTCFG, &temp);
1596 priv->original_hstcfg = temp;
1597 temp &= ~SMBHSTCFG_I2C_EN; /* SMBus timing */
1598 if (!(temp & SMBHSTCFG_HST_EN)) {
1599 dev_info(&dev->dev, "Enabling SMBus device\n");
1600 temp |= SMBHSTCFG_HST_EN;
1601 }
1602 pci_write_config_byte(priv->pci_dev, SMBHSTCFG, temp);
1603
1604 if (temp & SMBHSTCFG_SMB_SMI_EN) {
1605 dev_dbg(&dev->dev, "SMBus using interrupt SMI#\n");
1606 /* Disable SMBus interrupt feature if SMBus using SMI# */
1607 priv->features &= ~FEATURE_IRQ;
1608 }
1609 if (temp & SMBHSTCFG_SPD_WD)
1610 dev_info(&dev->dev, "SPD Write Disable is set\n");
1611
1612 /* Clear special mode bits */
1613 if (priv->features & (FEATURE_SMBUS_PEC | FEATURE_BLOCK_BUFFER))
1614 outb_p(inb_p(SMBAUXCTL(priv)) &
1615 ~(SMBAUXCTL_CRC | SMBAUXCTL_E32B), SMBAUXCTL(priv));
1616
1617 /* Default timeout in interrupt mode: 200 ms */
1618 priv->adapter.timeout = HZ / 5;
1619
1620 if (dev->irq == IRQ_NOTCONNECTED)
1621 priv->features &= ~FEATURE_IRQ;
1622
1623 if (priv->features & FEATURE_IRQ) {
1624 u16 pcictl, pcists;
1625
1626 /* Complain if an interrupt is already pending */
1627 pci_read_config_word(priv->pci_dev, SMBPCISTS, &pcists);
1628 if (pcists & SMBPCISTS_INTS)
1629 dev_warn(&dev->dev, "An interrupt is pending!\n");
1630
1631 /* Check if interrupts have been disabled */
1632 pci_read_config_word(priv->pci_dev, SMBPCICTL, &pcictl);
1633 if (pcictl & SMBPCICTL_INTDIS) {
1634 dev_info(&dev->dev, "Interrupts are disabled\n");
1635 priv->features &= ~FEATURE_IRQ;
1636 }
1637 }
1638
1639 if (priv->features & FEATURE_IRQ) {
1640 init_waitqueue_head(&priv->waitq);
1641
1642 err = devm_request_irq(&dev->dev, dev->irq, i801_isr,
1643 IRQF_SHARED,
1644 dev_driver_string(&dev->dev), priv);
1645 if (err) {
1646 dev_err(&dev->dev, "Failed to allocate irq %d: %d\n",
1647 dev->irq, err);
1648 priv->features &= ~FEATURE_IRQ;
1649 }
1650 }
1651 dev_info(&dev->dev, "SMBus using %s\n",
1652 priv->features & FEATURE_IRQ ? "PCI interrupt" : "polling");
1653
1654 i801_add_tco(priv);
1655
1656 snprintf(priv->adapter.name, sizeof(priv->adapter.name),
1657 "SMBus I801 adapter at %04lx", priv->smba);
1658 err = i2c_add_adapter(&priv->adapter);
1659 if (err) {
1660 i801_acpi_remove(priv);
1661 return err;
1662 }
1663
1664 i801_enable_host_notify(&priv->adapter);
1665
1666 i801_probe_optional_slaves(priv);
1667 /* We ignore errors - multiplexing is optional */
1668 i801_add_mux(priv);
1669
1670 pci_set_drvdata(dev, priv);
1671
1672 pm_runtime_set_autosuspend_delay(&dev->dev, 1000);
1673 pm_runtime_use_autosuspend(&dev->dev);
1674 pm_runtime_put_autosuspend(&dev->dev);
1675 pm_runtime_allow(&dev->dev);
1676
1677 return 0;
1678 }
1679
1680 static void i801_remove(struct pci_dev *dev)
1681 {
1682 struct i801_priv *priv = pci_get_drvdata(dev);
1683
1684 pm_runtime_forbid(&dev->dev);
1685 pm_runtime_get_noresume(&dev->dev);
1686
1687 i801_disable_host_notify(priv);
1688 i801_del_mux(priv);
1689 i2c_del_adapter(&priv->adapter);
1690 i801_acpi_remove(priv);
1691 pci_write_config_byte(dev, SMBHSTCFG, priv->original_hstcfg);
1692
1693 platform_device_unregister(priv->tco_pdev);
1694
1695 /*
1696 * do not call pci_disable_device(dev) since it can cause hard hangs on
1697 * some systems during power-off (eg. Fujitsu-Siemens Lifebook E8010)
1698 */
1699 }
1700
1701 #ifdef CONFIG_PM
1702 static int i801_suspend(struct device *dev)
1703 {
1704 struct pci_dev *pci_dev = to_pci_dev(dev);
1705 struct i801_priv *priv = pci_get_drvdata(pci_dev);
1706
1707 pci_write_config_byte(pci_dev, SMBHSTCFG, priv->original_hstcfg);
1708 return 0;
1709 }
1710
1711 static int i801_resume(struct device *dev)
1712 {
1713 struct pci_dev *pci_dev = to_pci_dev(dev);
1714 struct i801_priv *priv = pci_get_drvdata(pci_dev);
1715
1716 i801_enable_host_notify(&priv->adapter);
1717
1718 return 0;
1719 }
1720 #endif
1721
1722 static UNIVERSAL_DEV_PM_OPS(i801_pm_ops, i801_suspend,
1723 i801_resume, NULL);
1724
1725 static struct pci_driver i801_driver = {
1726 .name = "i801_smbus",
1727 .id_table = i801_ids,
1728 .probe = i801_probe,
1729 .remove = i801_remove,
1730 .driver = {
1731 .pm = &i801_pm_ops,
1732 },
1733 };
1734
1735 static int __init i2c_i801_init(void)
1736 {
1737 if (dmi_name_in_vendors("FUJITSU"))
1738 input_apanel_init();
1739 return pci_register_driver(&i801_driver);
1740 }
1741
1742 static void __exit i2c_i801_exit(void)
1743 {
1744 pci_unregister_driver(&i801_driver);
1745 }
1746
1747 MODULE_AUTHOR("Mark D. Studebaker <mdsxyz123@yahoo.com>, Jean Delvare <jdelvare@suse.de>");
1748 MODULE_DESCRIPTION("I801 SMBus driver");
1749 MODULE_LICENSE("GPL");
1750
1751 module_init(i2c_i801_init);
1752 module_exit(i2c_i801_exit);
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