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powerpc/fadump: Do not allow hot-remove memory from fadump reserved area.
[linux/fpc-iii.git] / drivers / i2c / busses / i2c-i801.c
blobc91e145ef5a56dbb1a512c23611f06ad7d22aa05
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 * Braswell (SOC) 0x2292 32 hard yes yes yes
62 * Sunrise Point-H (PCH) 0xa123 32 hard yes yes yes
63 * Sunrise Point-LP (PCH) 0x9d23 32 hard yes yes yes
64 * DNV (SOC) 0x19df 32 hard yes yes yes
65 * Broxton (SOC) 0x5ad4 32 hard yes yes yes
66 * Lewisburg (PCH) 0xa1a3 32 hard yes yes yes
67 * Lewisburg Supersku (PCH) 0xa223 32 hard yes yes yes
68 * Kaby Lake PCH-H (PCH) 0xa2a3 32 hard yes yes yes
69 * Gemini Lake (SOC) 0x31d4 32 hard yes yes yes
70 * Cannon Lake-H (PCH) 0xa323 32 hard yes yes yes
71 * Cannon Lake-LP (PCH) 0x9da3 32 hard yes yes yes
72 * Cedar Fork (PCH) 0x18df 32 hard yes yes yes
73 * Ice Lake-LP (PCH) 0x34a3 32 hard yes yes yes
74 *
75 * Features supported by this driver:
76 * Software PEC no
77 * Hardware PEC yes
78 * Block buffer yes
79 * Block process call transaction no
80 * I2C block read transaction yes (doesn't use the block buffer)
81 * Slave mode no
82 * SMBus Host Notify yes
83 * Interrupt processing yes
84 *
85 * See the file Documentation/i2c/busses/i2c-i801 for details.
86 */
87
88 #include <linux/interrupt.h>
89 #include <linux/module.h>
90 #include <linux/pci.h>
91 #include <linux/kernel.h>
92 #include <linux/stddef.h>
93 #include <linux/delay.h>
94 #include <linux/ioport.h>
95 #include <linux/init.h>
96 #include <linux/i2c.h>
97 #include <linux/i2c-smbus.h>
98 #include <linux/acpi.h>
99 #include <linux/io.h>
100 #include <linux/dmi.h>
101 #include <linux/slab.h>
102 #include <linux/wait.h>
103 #include <linux/err.h>
104 #include <linux/platform_device.h>
105 #include <linux/platform_data/itco_wdt.h>
106 #include <linux/pm_runtime.h>
107
108 #if IS_ENABLED(CONFIG_I2C_MUX_GPIO) && defined CONFIG_DMI
109 #include <linux/gpio.h>
110 #include <linux/platform_data/i2c-mux-gpio.h>
111 #endif
112
113 /* I801 SMBus address offsets */
114 #define SMBHSTSTS(p) (0 + (p)->smba)
115 #define SMBHSTCNT(p) (2 + (p)->smba)
116 #define SMBHSTCMD(p) (3 + (p)->smba)
117 #define SMBHSTADD(p) (4 + (p)->smba)
118 #define SMBHSTDAT0(p) (5 + (p)->smba)
119 #define SMBHSTDAT1(p) (6 + (p)->smba)
120 #define SMBBLKDAT(p) (7 + (p)->smba)
121 #define SMBPEC(p) (8 + (p)->smba) /* ICH3 and later */
122 #define SMBAUXSTS(p) (12 + (p)->smba) /* ICH4 and later */
123 #define SMBAUXCTL(p) (13 + (p)->smba) /* ICH4 and later */
124 #define SMBSLVSTS(p) (16 + (p)->smba) /* ICH3 and later */
125 #define SMBSLVCMD(p) (17 + (p)->smba) /* ICH3 and later */
126 #define SMBNTFDADD(p) (20 + (p)->smba) /* ICH3 and later */
127
128 /* PCI Address Constants */
129 #define SMBBAR 4
130 #define SMBPCICTL 0x004
131 #define SMBPCISTS 0x006
132 #define SMBHSTCFG 0x040
133 #define TCOBASE 0x050
134 #define TCOCTL 0x054
135
136 #define ACPIBASE 0x040
137 #define ACPIBASE_SMI_OFF 0x030
138 #define ACPICTRL 0x044
139 #define ACPICTRL_EN 0x080
140
141 #define SBREG_BAR 0x10
142 #define SBREG_SMBCTRL 0xc6000c
143 #define SBREG_SMBCTRL_DNV 0xcf000c
144
145 /* Host status bits for SMBPCISTS */
146 #define SMBPCISTS_INTS BIT(3)
147
148 /* Control bits for SMBPCICTL */
149 #define SMBPCICTL_INTDIS BIT(10)
150
151 /* Host configuration bits for SMBHSTCFG */
152 #define SMBHSTCFG_HST_EN BIT(0)
153 #define SMBHSTCFG_SMB_SMI_EN BIT(1)
154 #define SMBHSTCFG_I2C_EN BIT(2)
155 #define SMBHSTCFG_SPD_WD BIT(4)
156
157 /* TCO configuration bits for TCOCTL */
158 #define TCOCTL_EN BIT(8)
159
160 /* Auxiliary status register bits, ICH4+ only */
161 #define SMBAUXSTS_CRCE BIT(0)
162 #define SMBAUXSTS_STCO BIT(1)
163
164 /* Auxiliary control register bits, ICH4+ only */
165 #define SMBAUXCTL_CRC BIT(0)
166 #define SMBAUXCTL_E32B BIT(1)
167
168 /* Other settings */
169 #define MAX_RETRIES 400
170
171 /* I801 command constants */
172 #define I801_QUICK 0x00
173 #define I801_BYTE 0x04
174 #define I801_BYTE_DATA 0x08
175 #define I801_WORD_DATA 0x0C
176 #define I801_PROC_CALL 0x10 /* unimplemented */
177 #define I801_BLOCK_DATA 0x14
178 #define I801_I2C_BLOCK_DATA 0x18 /* ICH5 and later */
179
180 /* I801 Host Control register bits */
181 #define SMBHSTCNT_INTREN BIT(0)
182 #define SMBHSTCNT_KILL BIT(1)
183 #define SMBHSTCNT_LAST_BYTE BIT(5)
184 #define SMBHSTCNT_START BIT(6)
185 #define SMBHSTCNT_PEC_EN BIT(7) /* ICH3 and later */
186
187 /* I801 Hosts Status register bits */
188 #define SMBHSTSTS_BYTE_DONE BIT(7)
189 #define SMBHSTSTS_INUSE_STS BIT(6)
190 #define SMBHSTSTS_SMBALERT_STS BIT(5)
191 #define SMBHSTSTS_FAILED BIT(4)
192 #define SMBHSTSTS_BUS_ERR BIT(3)
193 #define SMBHSTSTS_DEV_ERR BIT(2)
194 #define SMBHSTSTS_INTR BIT(1)
195 #define SMBHSTSTS_HOST_BUSY BIT(0)
196
197 /* Host Notify Status register bits */
198 #define SMBSLVSTS_HST_NTFY_STS BIT(0)
199
200 /* Host Notify Command register bits */
201 #define SMBSLVCMD_HST_NTFY_INTREN BIT(0)
202
203 #define STATUS_ERROR_FLAGS (SMBHSTSTS_FAILED | SMBHSTSTS_BUS_ERR | \
204 SMBHSTSTS_DEV_ERR)
205
206 #define STATUS_FLAGS (SMBHSTSTS_BYTE_DONE | SMBHSTSTS_INTR | \
207 STATUS_ERROR_FLAGS)
208
209 /* Older devices have their ID defined in <linux/pci_ids.h> */
210 #define PCI_DEVICE_ID_INTEL_BAYTRAIL_SMBUS 0x0f12
211 #define PCI_DEVICE_ID_INTEL_CDF_SMBUS 0x18df
212 #define PCI_DEVICE_ID_INTEL_DNV_SMBUS 0x19df
213 #define PCI_DEVICE_ID_INTEL_COUGARPOINT_SMBUS 0x1c22
214 #define PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS 0x1d22
215 /* Patsburg also has three 'Integrated Device Function' SMBus controllers */
216 #define PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF0 0x1d70
217 #define PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF1 0x1d71
218 #define PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF2 0x1d72
219 #define PCI_DEVICE_ID_INTEL_PANTHERPOINT_SMBUS 0x1e22
220 #define PCI_DEVICE_ID_INTEL_AVOTON_SMBUS 0x1f3c
221 #define PCI_DEVICE_ID_INTEL_BRASWELL_SMBUS 0x2292
222 #define PCI_DEVICE_ID_INTEL_DH89XXCC_SMBUS 0x2330
223 #define PCI_DEVICE_ID_INTEL_COLETOCREEK_SMBUS 0x23b0
224 #define PCI_DEVICE_ID_INTEL_GEMINILAKE_SMBUS 0x31d4
225 #define PCI_DEVICE_ID_INTEL_ICELAKE_LP_SMBUS 0x34a3
226 #define PCI_DEVICE_ID_INTEL_5_3400_SERIES_SMBUS 0x3b30
227 #define PCI_DEVICE_ID_INTEL_BROXTON_SMBUS 0x5ad4
228 #define PCI_DEVICE_ID_INTEL_LYNXPOINT_SMBUS 0x8c22
229 #define PCI_DEVICE_ID_INTEL_WILDCATPOINT_SMBUS 0x8ca2
230 #define PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS 0x8d22
231 #define PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS0 0x8d7d
232 #define PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS1 0x8d7e
233 #define PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS2 0x8d7f
234 #define PCI_DEVICE_ID_INTEL_LYNXPOINT_LP_SMBUS 0x9c22
235 #define PCI_DEVICE_ID_INTEL_WILDCATPOINT_LP_SMBUS 0x9ca2
236 #define PCI_DEVICE_ID_INTEL_SUNRISEPOINT_LP_SMBUS 0x9d23
237 #define PCI_DEVICE_ID_INTEL_CANNONLAKE_LP_SMBUS 0x9da3
238 #define PCI_DEVICE_ID_INTEL_SUNRISEPOINT_H_SMBUS 0xa123
239 #define PCI_DEVICE_ID_INTEL_LEWISBURG_SMBUS 0xa1a3
240 #define PCI_DEVICE_ID_INTEL_LEWISBURG_SSKU_SMBUS 0xa223
241 #define PCI_DEVICE_ID_INTEL_KABYLAKE_PCH_H_SMBUS 0xa2a3
242 #define PCI_DEVICE_ID_INTEL_CANNONLAKE_H_SMBUS 0xa323
243
244 struct i801_mux_config {
245 char *gpio_chip;
246 unsigned values[3];
247 int n_values;
248 unsigned classes[3];
249 unsigned gpios[2]; /* Relative to gpio_chip->base */
250 int n_gpios;
251 };
252
253 struct i801_priv {
254 struct i2c_adapter adapter;
255 unsigned long smba;
256 unsigned char original_hstcfg;
257 unsigned char original_slvcmd;
258 struct pci_dev *pci_dev;
259 unsigned int features;
260
261 /* isr processing */
262 wait_queue_head_t waitq;
263 u8 status;
264
265 /* Command state used by isr for byte-by-byte block transactions */
266 u8 cmd;
267 bool is_read;
268 int count;
269 int len;
270 u8 *data;
271
272 #if IS_ENABLED(CONFIG_I2C_MUX_GPIO) && defined CONFIG_DMI
273 const struct i801_mux_config *mux_drvdata;
274 struct platform_device *mux_pdev;
275 #endif
276 struct platform_device *tco_pdev;
277
278 /*
279 * If set to true the host controller registers are reserved for
280 * ACPI AML use. Protected by acpi_lock.
281 */
282 bool acpi_reserved;
283 struct mutex acpi_lock;
284 };
285
286 #define FEATURE_SMBUS_PEC BIT(0)
287 #define FEATURE_BLOCK_BUFFER BIT(1)
288 #define FEATURE_BLOCK_PROC BIT(2)
289 #define FEATURE_I2C_BLOCK_READ BIT(3)
290 #define FEATURE_IRQ BIT(4)
291 #define FEATURE_HOST_NOTIFY BIT(5)
292 /* Not really a feature, but it's convenient to handle it as such */
293 #define FEATURE_IDF BIT(15)
294 #define FEATURE_TCO BIT(16)
295
296 static const char *i801_feature_names[] = {
297 "SMBus PEC",
298 "Block buffer",
299 "Block process call",
300 "I2C block read",
301 "Interrupt",
302 "SMBus Host Notify",
303 };
304
305 static unsigned int disable_features;
306 module_param(disable_features, uint, S_IRUGO | S_IWUSR);
307 MODULE_PARM_DESC(disable_features, "Disable selected driver features:\n"
308 "\t\t 0x01 disable SMBus PEC\n"
309 "\t\t 0x02 disable the block buffer\n"
310 "\t\t 0x08 disable the I2C block read functionality\n"
311 "\t\t 0x10 don't use interrupts\n"
312 "\t\t 0x20 disable SMBus Host Notify ");
313
314 /* Make sure the SMBus host is ready to start transmitting.
315 Return 0 if it is, -EBUSY if it is not. */
316 static int i801_check_pre(struct i801_priv *priv)
317 {
318 int status;
319
320 status = inb_p(SMBHSTSTS(priv));
321 if (status & SMBHSTSTS_HOST_BUSY) {
322 dev_err(&priv->pci_dev->dev, "SMBus is busy, can't use it!\n");
323 return -EBUSY;
324 }
325
326 status &= STATUS_FLAGS;
327 if (status) {
328 dev_dbg(&priv->pci_dev->dev, "Clearing status flags (%02x)\n",
329 status);
330 outb_p(status, SMBHSTSTS(priv));
331 status = inb_p(SMBHSTSTS(priv)) & STATUS_FLAGS;
332 if (status) {
333 dev_err(&priv->pci_dev->dev,
334 "Failed clearing status flags (%02x)\n",
335 status);
336 return -EBUSY;
337 }
338 }
339
340 /*
341 * Clear CRC status if needed.
342 * During normal operation, i801_check_post() takes care
343 * of it after every operation. We do it here only in case
344 * the hardware was already in this state when the driver
345 * started.
346 */
347 if (priv->features & FEATURE_SMBUS_PEC) {
348 status = inb_p(SMBAUXSTS(priv)) & SMBAUXSTS_CRCE;
349 if (status) {
350 dev_dbg(&priv->pci_dev->dev,
351 "Clearing aux status flags (%02x)\n", status);
352 outb_p(status, SMBAUXSTS(priv));
353 status = inb_p(SMBAUXSTS(priv)) & SMBAUXSTS_CRCE;
354 if (status) {
355 dev_err(&priv->pci_dev->dev,
356 "Failed clearing aux status flags (%02x)\n",
357 status);
358 return -EBUSY;
359 }
360 }
361 }
362
363 return 0;
364 }
365
366 /*
367 * Convert the status register to an error code, and clear it.
368 * Note that status only contains the bits we want to clear, not the
369 * actual register value.
370 */
371 static int i801_check_post(struct i801_priv *priv, int status)
372 {
373 int result = 0;
374
375 /*
376 * If the SMBus is still busy, we give up
377 * Note: This timeout condition only happens when using polling
378 * transactions. For interrupt operation, NAK/timeout is indicated by
379 * DEV_ERR.
380 */
381 if (unlikely(status < 0)) {
382 dev_err(&priv->pci_dev->dev, "Transaction timeout\n");
383 /* try to stop the current command */
384 dev_dbg(&priv->pci_dev->dev, "Terminating the current operation\n");
385 outb_p(inb_p(SMBHSTCNT(priv)) | SMBHSTCNT_KILL,
386 SMBHSTCNT(priv));
387 usleep_range(1000, 2000);
388 outb_p(inb_p(SMBHSTCNT(priv)) & (~SMBHSTCNT_KILL),
389 SMBHSTCNT(priv));
390
391 /* Check if it worked */
392 status = inb_p(SMBHSTSTS(priv));
393 if ((status & SMBHSTSTS_HOST_BUSY) ||
394 !(status & SMBHSTSTS_FAILED))
395 dev_err(&priv->pci_dev->dev,
396 "Failed terminating the transaction\n");
397 outb_p(STATUS_FLAGS, SMBHSTSTS(priv));
398 return -ETIMEDOUT;
399 }
400
401 if (status & SMBHSTSTS_FAILED) {
402 result = -EIO;
403 dev_err(&priv->pci_dev->dev, "Transaction failed\n");
404 }
405 if (status & SMBHSTSTS_DEV_ERR) {
406 /*
407 * This may be a PEC error, check and clear it.
408 *
409 * AUXSTS is handled differently from HSTSTS.
410 * For HSTSTS, i801_isr() or i801_wait_intr()
411 * has already cleared the error bits in hardware,
412 * and we are passed a copy of the original value
413 * in "status".
414 * For AUXSTS, the hardware register is left
415 * for us to handle here.
416 * This is asymmetric, slightly iffy, but safe,
417 * since all this code is serialized and the CRCE
418 * bit is harmless as long as it's cleared before
419 * the next operation.
420 */
421 if ((priv->features & FEATURE_SMBUS_PEC) &&
422 (inb_p(SMBAUXSTS(priv)) & SMBAUXSTS_CRCE)) {
423 outb_p(SMBAUXSTS_CRCE, SMBAUXSTS(priv));
424 result = -EBADMSG;
425 dev_dbg(&priv->pci_dev->dev, "PEC error\n");
426 } else {
427 result = -ENXIO;
428 dev_dbg(&priv->pci_dev->dev, "No response\n");
429 }
430 }
431 if (status & SMBHSTSTS_BUS_ERR) {
432 result = -EAGAIN;
433 dev_dbg(&priv->pci_dev->dev, "Lost arbitration\n");
434 }
435
436 /* Clear status flags except BYTE_DONE, to be cleared by caller */
437 outb_p(status, SMBHSTSTS(priv));
438
439 return result;
440 }
441
442 /* Wait for BUSY being cleared and either INTR or an error flag being set */
443 static int i801_wait_intr(struct i801_priv *priv)
444 {
445 int timeout = 0;
446 int status;
447
448 /* We will always wait for a fraction of a second! */
449 do {
450 usleep_range(250, 500);
451 status = inb_p(SMBHSTSTS(priv));
452 } while (((status & SMBHSTSTS_HOST_BUSY) ||
453 !(status & (STATUS_ERROR_FLAGS | SMBHSTSTS_INTR))) &&
454 (timeout++ < MAX_RETRIES));
455
456 if (timeout > MAX_RETRIES) {
457 dev_dbg(&priv->pci_dev->dev, "INTR Timeout!\n");
458 return -ETIMEDOUT;
459 }
460 return status & (STATUS_ERROR_FLAGS | SMBHSTSTS_INTR);
461 }
462
463 /* Wait for either BYTE_DONE or an error flag being set */
464 static int i801_wait_byte_done(struct i801_priv *priv)
465 {
466 int timeout = 0;
467 int status;
468
469 /* We will always wait for a fraction of a second! */
470 do {
471 usleep_range(250, 500);
472 status = inb_p(SMBHSTSTS(priv));
473 } while (!(status & (STATUS_ERROR_FLAGS | SMBHSTSTS_BYTE_DONE)) &&
474 (timeout++ < MAX_RETRIES));
475
476 if (timeout > MAX_RETRIES) {
477 dev_dbg(&priv->pci_dev->dev, "BYTE_DONE Timeout!\n");
478 return -ETIMEDOUT;
479 }
480 return status & STATUS_ERROR_FLAGS;
481 }
482
483 static int i801_transaction(struct i801_priv *priv, int xact)
484 {
485 int status;
486 int result;
487 const struct i2c_adapter *adap = &priv->adapter;
488
489 result = i801_check_pre(priv);
490 if (result < 0)
491 return result;
492
493 if (priv->features & FEATURE_IRQ) {
494 outb_p(xact | SMBHSTCNT_INTREN | SMBHSTCNT_START,
495 SMBHSTCNT(priv));
496 result = wait_event_timeout(priv->waitq,
497 (status = priv->status),
498 adap->timeout);
499 if (!result) {
500 status = -ETIMEDOUT;
501 dev_warn(&priv->pci_dev->dev,
502 "Timeout waiting for interrupt!\n");
503 }
504 priv->status = 0;
505 return i801_check_post(priv, status);
506 }
507
508 /* the current contents of SMBHSTCNT can be overwritten, since PEC,
509 * SMBSCMD are passed in xact */
510 outb_p(xact | SMBHSTCNT_START, SMBHSTCNT(priv));
511
512 status = i801_wait_intr(priv);
513 return i801_check_post(priv, status);
514 }
515
516 static int i801_block_transaction_by_block(struct i801_priv *priv,
517 union i2c_smbus_data *data,
518 char read_write, int hwpec)
519 {
520 int i, len;
521 int status;
522
523 inb_p(SMBHSTCNT(priv)); /* reset the data buffer index */
524
525 /* Use 32-byte buffer to process this transaction */
526 if (read_write == I2C_SMBUS_WRITE) {
527 len = data->block[0];
528 outb_p(len, SMBHSTDAT0(priv));
529 for (i = 0; i < len; i++)
530 outb_p(data->block[i+1], SMBBLKDAT(priv));
531 }
532
533 status = i801_transaction(priv, I801_BLOCK_DATA |
534 (hwpec ? SMBHSTCNT_PEC_EN : 0));
535 if (status)
536 return status;
537
538 if (read_write == I2C_SMBUS_READ) {
539 len = inb_p(SMBHSTDAT0(priv));
540 if (len < 1 || len > I2C_SMBUS_BLOCK_MAX)
541 return -EPROTO;
542
543 data->block[0] = len;
544 for (i = 0; i < len; i++)
545 data->block[i + 1] = inb_p(SMBBLKDAT(priv));
546 }
547 return 0;
548 }
549
550 static void i801_isr_byte_done(struct i801_priv *priv)
551 {
552 if (priv->is_read) {
553 /* For SMBus block reads, length is received with first byte */
554 if (((priv->cmd & 0x1c) == I801_BLOCK_DATA) &&
555 (priv->count == 0)) {
556 priv->len = inb_p(SMBHSTDAT0(priv));
557 if (priv->len < 1 || priv->len > I2C_SMBUS_BLOCK_MAX) {
558 dev_err(&priv->pci_dev->dev,
559 "Illegal SMBus block read size %d\n",
560 priv->len);
561 /* FIXME: Recover */
562 priv->len = I2C_SMBUS_BLOCK_MAX;
563 } else {
564 dev_dbg(&priv->pci_dev->dev,
565 "SMBus block read size is %d\n",
566 priv->len);
567 }
568 priv->data[-1] = priv->len;
569 }
570
571 /* Read next byte */
572 if (priv->count < priv->len)
573 priv->data[priv->count++] = inb(SMBBLKDAT(priv));
574 else
575 dev_dbg(&priv->pci_dev->dev,
576 "Discarding extra byte on block read\n");
577
578 /* Set LAST_BYTE for last byte of read transaction */
579 if (priv->count == priv->len - 1)
580 outb_p(priv->cmd | SMBHSTCNT_LAST_BYTE,
581 SMBHSTCNT(priv));
582 } else if (priv->count < priv->len - 1) {
583 /* Write next byte, except for IRQ after last byte */
584 outb_p(priv->data[++priv->count], SMBBLKDAT(priv));
585 }
586
587 /* Clear BYTE_DONE to continue with next byte */
588 outb_p(SMBHSTSTS_BYTE_DONE, SMBHSTSTS(priv));
589 }
590
591 static irqreturn_t i801_host_notify_isr(struct i801_priv *priv)
592 {
593 unsigned short addr;
594
595 addr = inb_p(SMBNTFDADD(priv)) >> 1;
596
597 /*
598 * With the tested platforms, reading SMBNTFDDAT (22 + (p)->smba)
599 * always returns 0. Our current implementation doesn't provide
600 * data, so we just ignore it.
601 */
602 i2c_handle_smbus_host_notify(&priv->adapter, addr);
603
604 /* clear Host Notify bit and return */
605 outb_p(SMBSLVSTS_HST_NTFY_STS, SMBSLVSTS(priv));
606 return IRQ_HANDLED;
607 }
608
609 /*
610 * There are three kinds of interrupts:
611 *
612 * 1) i801 signals transaction completion with one of these interrupts:
613 * INTR - Success
614 * DEV_ERR - Invalid command, NAK or communication timeout
615 * BUS_ERR - SMI# transaction collision
616 * FAILED - transaction was canceled due to a KILL request
617 * When any of these occur, update ->status and wake up the waitq.
618 * ->status must be cleared before kicking off the next transaction.
619 *
620 * 2) For byte-by-byte (I2C read/write) transactions, one BYTE_DONE interrupt
621 * occurs for each byte of a byte-by-byte to prepare the next byte.
622 *
623 * 3) Host Notify interrupts
624 */
625 static irqreturn_t i801_isr(int irq, void *dev_id)
626 {
627 struct i801_priv *priv = dev_id;
628 u16 pcists;
629 u8 status;
630
631 /* Confirm this is our interrupt */
632 pci_read_config_word(priv->pci_dev, SMBPCISTS, &pcists);
633 if (!(pcists & SMBPCISTS_INTS))
634 return IRQ_NONE;
635
636 if (priv->features & FEATURE_HOST_NOTIFY) {
637 status = inb_p(SMBSLVSTS(priv));
638 if (status & SMBSLVSTS_HST_NTFY_STS)
639 return i801_host_notify_isr(priv);
640 }
641
642 status = inb_p(SMBHSTSTS(priv));
643 if (status & SMBHSTSTS_BYTE_DONE)
644 i801_isr_byte_done(priv);
645
646 /*
647 * Clear irq sources and report transaction result.
648 * ->status must be cleared before the next transaction is started.
649 */
650 status &= SMBHSTSTS_INTR | STATUS_ERROR_FLAGS;
651 if (status) {
652 outb_p(status, SMBHSTSTS(priv));
653 priv->status = status;
654 wake_up(&priv->waitq);
655 }
656
657 return IRQ_HANDLED;
658 }
659
660 /*
661 * For "byte-by-byte" block transactions:
662 * I2C write uses cmd=I801_BLOCK_DATA, I2C_EN=1
663 * I2C read uses cmd=I801_I2C_BLOCK_DATA
664 */
665 static int i801_block_transaction_byte_by_byte(struct i801_priv *priv,
666 union i2c_smbus_data *data,
667 char read_write, int command,
668 int hwpec)
669 {
670 int i, len;
671 int smbcmd;
672 int status;
673 int result;
674 const struct i2c_adapter *adap = &priv->adapter;
675
676 result = i801_check_pre(priv);
677 if (result < 0)
678 return result;
679
680 len = data->block[0];
681
682 if (read_write == I2C_SMBUS_WRITE) {
683 outb_p(len, SMBHSTDAT0(priv));
684 outb_p(data->block[1], SMBBLKDAT(priv));
685 }
686
687 if (command == I2C_SMBUS_I2C_BLOCK_DATA &&
688 read_write == I2C_SMBUS_READ)
689 smbcmd = I801_I2C_BLOCK_DATA;
690 else
691 smbcmd = I801_BLOCK_DATA;
692
693 if (priv->features & FEATURE_IRQ) {
694 priv->is_read = (read_write == I2C_SMBUS_READ);
695 if (len == 1 && priv->is_read)
696 smbcmd |= SMBHSTCNT_LAST_BYTE;
697 priv->cmd = smbcmd | SMBHSTCNT_INTREN;
698 priv->len = len;
699 priv->count = 0;
700 priv->data = &data->block[1];
701
702 outb_p(priv->cmd | SMBHSTCNT_START, SMBHSTCNT(priv));
703 result = wait_event_timeout(priv->waitq,
704 (status = priv->status),
705 adap->timeout);
706 if (!result) {
707 status = -ETIMEDOUT;
708 dev_warn(&priv->pci_dev->dev,
709 "Timeout waiting for interrupt!\n");
710 }
711 priv->status = 0;
712 return i801_check_post(priv, status);
713 }
714
715 for (i = 1; i <= len; i++) {
716 if (i == len && read_write == I2C_SMBUS_READ)
717 smbcmd |= SMBHSTCNT_LAST_BYTE;
718 outb_p(smbcmd, SMBHSTCNT(priv));
719
720 if (i == 1)
721 outb_p(inb(SMBHSTCNT(priv)) | SMBHSTCNT_START,
722 SMBHSTCNT(priv));
723
724 status = i801_wait_byte_done(priv);
725 if (status)
726 goto exit;
727
728 if (i == 1 && read_write == I2C_SMBUS_READ
729 && command != I2C_SMBUS_I2C_BLOCK_DATA) {
730 len = inb_p(SMBHSTDAT0(priv));
731 if (len < 1 || len > I2C_SMBUS_BLOCK_MAX) {
732 dev_err(&priv->pci_dev->dev,
733 "Illegal SMBus block read size %d\n",
734 len);
735 /* Recover */
736 while (inb_p(SMBHSTSTS(priv)) &
737 SMBHSTSTS_HOST_BUSY)
738 outb_p(SMBHSTSTS_BYTE_DONE,
739 SMBHSTSTS(priv));
740 outb_p(SMBHSTSTS_INTR, SMBHSTSTS(priv));
741 return -EPROTO;
742 }
743 data->block[0] = len;
744 }
745
746 /* Retrieve/store value in SMBBLKDAT */
747 if (read_write == I2C_SMBUS_READ)
748 data->block[i] = inb_p(SMBBLKDAT(priv));
749 if (read_write == I2C_SMBUS_WRITE && i+1 <= len)
750 outb_p(data->block[i+1], SMBBLKDAT(priv));
751
752 /* signals SMBBLKDAT ready */
753 outb_p(SMBHSTSTS_BYTE_DONE, SMBHSTSTS(priv));
754 }
755
756 status = i801_wait_intr(priv);
757 exit:
758 return i801_check_post(priv, status);
759 }
760
761 static int i801_set_block_buffer_mode(struct i801_priv *priv)
762 {
763 outb_p(inb_p(SMBAUXCTL(priv)) | SMBAUXCTL_E32B, SMBAUXCTL(priv));
764 if ((inb_p(SMBAUXCTL(priv)) & SMBAUXCTL_E32B) == 0)
765 return -EIO;
766 return 0;
767 }
768
769 /* Block transaction function */
770 static int i801_block_transaction(struct i801_priv *priv,
771 union i2c_smbus_data *data, char read_write,
772 int command, int hwpec)
773 {
774 int result = 0;
775 unsigned char hostc;
776
777 if (command == I2C_SMBUS_I2C_BLOCK_DATA) {
778 if (read_write == I2C_SMBUS_WRITE) {
779 /* set I2C_EN bit in configuration register */
780 pci_read_config_byte(priv->pci_dev, SMBHSTCFG, &hostc);
781 pci_write_config_byte(priv->pci_dev, SMBHSTCFG,
782 hostc | SMBHSTCFG_I2C_EN);
783 } else if (!(priv->features & FEATURE_I2C_BLOCK_READ)) {
784 dev_err(&priv->pci_dev->dev,
785 "I2C block read is unsupported!\n");
786 return -EOPNOTSUPP;
787 }
788 }
789
790 if (read_write == I2C_SMBUS_WRITE
791 || command == I2C_SMBUS_I2C_BLOCK_DATA) {
792 if (data->block[0] < 1)
793 data->block[0] = 1;
794 if (data->block[0] > I2C_SMBUS_BLOCK_MAX)
795 data->block[0] = I2C_SMBUS_BLOCK_MAX;
796 } else {
797 data->block[0] = 32; /* max for SMBus block reads */
798 }
799
800 /* Experience has shown that the block buffer can only be used for
801 SMBus (not I2C) block transactions, even though the datasheet
802 doesn't mention this limitation. */
803 if ((priv->features & FEATURE_BLOCK_BUFFER)
804 && command != I2C_SMBUS_I2C_BLOCK_DATA
805 && i801_set_block_buffer_mode(priv) == 0)
806 result = i801_block_transaction_by_block(priv, data,
807 read_write, hwpec);
808 else
809 result = i801_block_transaction_byte_by_byte(priv, data,
810 read_write,
811 command, hwpec);
812
813 if (command == I2C_SMBUS_I2C_BLOCK_DATA
814 && read_write == I2C_SMBUS_WRITE) {
815 /* restore saved configuration register value */
816 pci_write_config_byte(priv->pci_dev, SMBHSTCFG, hostc);
817 }
818 return result;
819 }
820
821 /* Return negative errno on error. */
822 static s32 i801_access(struct i2c_adapter *adap, u16 addr,
823 unsigned short flags, char read_write, u8 command,
824 int size, union i2c_smbus_data *data)
825 {
826 int hwpec;
827 int block = 0;
828 int ret = 0, xact = 0;
829 struct i801_priv *priv = i2c_get_adapdata(adap);
830
831 mutex_lock(&priv->acpi_lock);
832 if (priv->acpi_reserved) {
833 mutex_unlock(&priv->acpi_lock);
834 return -EBUSY;
835 }
836
837 pm_runtime_get_sync(&priv->pci_dev->dev);
838
839 hwpec = (priv->features & FEATURE_SMBUS_PEC) && (flags & I2C_CLIENT_PEC)
840 && size != I2C_SMBUS_QUICK
841 && size != I2C_SMBUS_I2C_BLOCK_DATA;
842
843 switch (size) {
844 case I2C_SMBUS_QUICK:
845 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
846 SMBHSTADD(priv));
847 xact = I801_QUICK;
848 break;
849 case I2C_SMBUS_BYTE:
850 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
851 SMBHSTADD(priv));
852 if (read_write == I2C_SMBUS_WRITE)
853 outb_p(command, SMBHSTCMD(priv));
854 xact = I801_BYTE;
855 break;
856 case I2C_SMBUS_BYTE_DATA:
857 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
858 SMBHSTADD(priv));
859 outb_p(command, SMBHSTCMD(priv));
860 if (read_write == I2C_SMBUS_WRITE)
861 outb_p(data->byte, SMBHSTDAT0(priv));
862 xact = I801_BYTE_DATA;
863 break;
864 case I2C_SMBUS_WORD_DATA:
865 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
866 SMBHSTADD(priv));
867 outb_p(command, SMBHSTCMD(priv));
868 if (read_write == I2C_SMBUS_WRITE) {
869 outb_p(data->word & 0xff, SMBHSTDAT0(priv));
870 outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1(priv));
871 }
872 xact = I801_WORD_DATA;
873 break;
874 case I2C_SMBUS_BLOCK_DATA:
875 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
876 SMBHSTADD(priv));
877 outb_p(command, SMBHSTCMD(priv));
878 block = 1;
879 break;
880 case I2C_SMBUS_I2C_BLOCK_DATA:
881 /*
882 * NB: page 240 of ICH5 datasheet shows that the R/#W
883 * bit should be cleared here, even when reading.
884 * However if SPD Write Disable is set (Lynx Point and later),
885 * the read will fail if we don't set the R/#W bit.
886 */
887 outb_p(((addr & 0x7f) << 1) |
888 ((priv->original_hstcfg & SMBHSTCFG_SPD_WD) ?
889 (read_write & 0x01) : 0),
890 SMBHSTADD(priv));
891 if (read_write == I2C_SMBUS_READ) {
892 /* NB: page 240 of ICH5 datasheet also shows
893 * that DATA1 is the cmd field when reading */
894 outb_p(command, SMBHSTDAT1(priv));
895 } else
896 outb_p(command, SMBHSTCMD(priv));
897 block = 1;
898 break;
899 default:
900 dev_err(&priv->pci_dev->dev, "Unsupported transaction %d\n",
901 size);
902 ret = -EOPNOTSUPP;
903 goto out;
904 }
905
906 if (hwpec) /* enable/disable hardware PEC */
907 outb_p(inb_p(SMBAUXCTL(priv)) | SMBAUXCTL_CRC, SMBAUXCTL(priv));
908 else
909 outb_p(inb_p(SMBAUXCTL(priv)) & (~SMBAUXCTL_CRC),
910 SMBAUXCTL(priv));
911
912 if (block)
913 ret = i801_block_transaction(priv, data, read_write, size,
914 hwpec);
915 else
916 ret = i801_transaction(priv, xact);
917
918 /* Some BIOSes don't like it when PEC is enabled at reboot or resume
919 time, so we forcibly disable it after every transaction. Turn off
920 E32B for the same reason. */
921 if (hwpec || block)
922 outb_p(inb_p(SMBAUXCTL(priv)) &
923 ~(SMBAUXCTL_CRC | SMBAUXCTL_E32B), SMBAUXCTL(priv));
924
925 if (block)
926 goto out;
927 if (ret)
928 goto out;
929 if ((read_write == I2C_SMBUS_WRITE) || (xact == I801_QUICK))
930 goto out;
931
932 switch (xact & 0x7f) {
933 case I801_BYTE: /* Result put in SMBHSTDAT0 */
934 case I801_BYTE_DATA:
935 data->byte = inb_p(SMBHSTDAT0(priv));
936 break;
937 case I801_WORD_DATA:
938 data->word = inb_p(SMBHSTDAT0(priv)) +
939 (inb_p(SMBHSTDAT1(priv)) << 8);
940 break;
941 }
942
943 out:
944 pm_runtime_mark_last_busy(&priv->pci_dev->dev);
945 pm_runtime_put_autosuspend(&priv->pci_dev->dev);
946 mutex_unlock(&priv->acpi_lock);
947 return ret;
948 }
949
950
951 static u32 i801_func(struct i2c_adapter *adapter)
952 {
953 struct i801_priv *priv = i2c_get_adapdata(adapter);
954
955 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
956 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
957 I2C_FUNC_SMBUS_BLOCK_DATA | I2C_FUNC_SMBUS_WRITE_I2C_BLOCK |
958 ((priv->features & FEATURE_SMBUS_PEC) ? I2C_FUNC_SMBUS_PEC : 0) |
959 ((priv->features & FEATURE_I2C_BLOCK_READ) ?
960 I2C_FUNC_SMBUS_READ_I2C_BLOCK : 0) |
961 ((priv->features & FEATURE_HOST_NOTIFY) ?
962 I2C_FUNC_SMBUS_HOST_NOTIFY : 0);
963 }
964
965 static void i801_enable_host_notify(struct i2c_adapter *adapter)
966 {
967 struct i801_priv *priv = i2c_get_adapdata(adapter);
968
969 if (!(priv->features & FEATURE_HOST_NOTIFY))
970 return;
971
972 if (!(SMBSLVCMD_HST_NTFY_INTREN & priv->original_slvcmd))
973 outb_p(SMBSLVCMD_HST_NTFY_INTREN | priv->original_slvcmd,
974 SMBSLVCMD(priv));
975
976 /* clear Host Notify bit to allow a new notification */
977 outb_p(SMBSLVSTS_HST_NTFY_STS, SMBSLVSTS(priv));
978 }
979
980 static void i801_disable_host_notify(struct i801_priv *priv)
981 {
982 if (!(priv->features & FEATURE_HOST_NOTIFY))
983 return;
984
985 outb_p(priv->original_slvcmd, SMBSLVCMD(priv));
986 }
987
988 static const struct i2c_algorithm smbus_algorithm = {
989 .smbus_xfer = i801_access,
990 .functionality = i801_func,
991 };
992
993 static const struct pci_device_id i801_ids[] = {
994 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801AA_3) },
995 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801AB_3) },
996 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801BA_2) },
997 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_3) },
998 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_3) },
999 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_3) },
1000 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB_4) },
1001 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_16) },
1002 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_17) },
1003 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB2_17) },
1004 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH8_5) },
1005 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH9_6) },
1006 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_EP80579_1) },
1007 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH10_4) },
1008 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH10_5) },
1009 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_5_3400_SERIES_SMBUS) },
1010 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_COUGARPOINT_SMBUS) },
1011 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS) },
1012 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF0) },
1013 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF1) },
1014 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF2) },
1015 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_DH89XXCC_SMBUS) },
1016 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_PANTHERPOINT_SMBUS) },
1017 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_LYNXPOINT_SMBUS) },
1018 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_LYNXPOINT_LP_SMBUS) },
1019 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_AVOTON_SMBUS) },
1020 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS) },
1021 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS0) },
1022 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS1) },
1023 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS2) },
1024 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_COLETOCREEK_SMBUS) },
1025 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_GEMINILAKE_SMBUS) },
1026 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_WILDCATPOINT_SMBUS) },
1027 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_WILDCATPOINT_LP_SMBUS) },
1028 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_BAYTRAIL_SMBUS) },
1029 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_BRASWELL_SMBUS) },
1030 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_SUNRISEPOINT_H_SMBUS) },
1031 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_SUNRISEPOINT_LP_SMBUS) },
1032 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_CDF_SMBUS) },
1033 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_DNV_SMBUS) },
1034 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_BROXTON_SMBUS) },
1035 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_LEWISBURG_SMBUS) },
1036 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_LEWISBURG_SSKU_SMBUS) },
1037 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_KABYLAKE_PCH_H_SMBUS) },
1038 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_CANNONLAKE_H_SMBUS) },
1039 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_CANNONLAKE_LP_SMBUS) },
1040 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICELAKE_LP_SMBUS) },
1041 { 0, }
1042 };
1043
1044 MODULE_DEVICE_TABLE(pci, i801_ids);
1045
1046 #if defined CONFIG_X86 && defined CONFIG_DMI
1047 static unsigned char apanel_addr;
1048
1049 /* Scan the system ROM for the signature "FJKEYINF" */
1050 static __init const void __iomem *bios_signature(const void __iomem *bios)
1051 {
1052 ssize_t offset;
1053 const unsigned char signature[] = "FJKEYINF";
1054
1055 for (offset = 0; offset < 0x10000; offset += 0x10) {
1056 if (check_signature(bios + offset, signature,
1057 sizeof(signature)-1))
1058 return bios + offset;
1059 }
1060 return NULL;
1061 }
1062
1063 static void __init input_apanel_init(void)
1064 {
1065 void __iomem *bios;
1066 const void __iomem *p;
1067
1068 bios = ioremap(0xF0000, 0x10000); /* Can't fail */
1069 p = bios_signature(bios);
1070 if (p) {
1071 /* just use the first address */
1072 apanel_addr = readb(p + 8 + 3) >> 1;
1073 }
1074 iounmap(bios);
1075 }
1076
1077 struct dmi_onboard_device_info {
1078 const char *name;
1079 u8 type;
1080 unsigned short i2c_addr;
1081 const char *i2c_type;
1082 };
1083
1084 static const struct dmi_onboard_device_info dmi_devices[] = {
1085 { "Syleus", DMI_DEV_TYPE_OTHER, 0x73, "fscsyl" },
1086 { "Hermes", DMI_DEV_TYPE_OTHER, 0x73, "fscher" },
1087 { "Hades", DMI_DEV_TYPE_OTHER, 0x73, "fschds" },
1088 };
1089
1090 static void dmi_check_onboard_device(u8 type, const char *name,
1091 struct i2c_adapter *adap)
1092 {
1093 int i;
1094 struct i2c_board_info info;
1095
1096 for (i = 0; i < ARRAY_SIZE(dmi_devices); i++) {
1097 /* & ~0x80, ignore enabled/disabled bit */
1098 if ((type & ~0x80) != dmi_devices[i].type)
1099 continue;
1100 if (strcasecmp(name, dmi_devices[i].name))
1101 continue;
1102
1103 memset(&info, 0, sizeof(struct i2c_board_info));
1104 info.addr = dmi_devices[i].i2c_addr;
1105 strlcpy(info.type, dmi_devices[i].i2c_type, I2C_NAME_SIZE);
1106 i2c_new_device(adap, &info);
1107 break;
1108 }
1109 }
1110
1111 /* We use our own function to check for onboard devices instead of
1112 dmi_find_device() as some buggy BIOS's have the devices we are interested
1113 in marked as disabled */
1114 static void dmi_check_onboard_devices(const struct dmi_header *dm, void *adap)
1115 {
1116 int i, count;
1117
1118 if (dm->type != 10)
1119 return;
1120
1121 count = (dm->length - sizeof(struct dmi_header)) / 2;
1122 for (i = 0; i < count; i++) {
1123 const u8 *d = (char *)(dm + 1) + (i * 2);
1124 const char *name = ((char *) dm) + dm->length;
1125 u8 type = d[0];
1126 u8 s = d[1];
1127
1128 if (!s)
1129 continue;
1130 s--;
1131 while (s > 0 && name[0]) {
1132 name += strlen(name) + 1;
1133 s--;
1134 }
1135 if (name[0] == 0) /* Bogus string reference */
1136 continue;
1137
1138 dmi_check_onboard_device(type, name, adap);
1139 }
1140 }
1141
1142 /* Register optional slaves */
1143 static void i801_probe_optional_slaves(struct i801_priv *priv)
1144 {
1145 /* Only register slaves on main SMBus channel */
1146 if (priv->features & FEATURE_IDF)
1147 return;
1148
1149 if (apanel_addr) {
1150 struct i2c_board_info info;
1151
1152 memset(&info, 0, sizeof(struct i2c_board_info));
1153 info.addr = apanel_addr;
1154 strlcpy(info.type, "fujitsu_apanel", I2C_NAME_SIZE);
1155 i2c_new_device(&priv->adapter, &info);
1156 }
1157
1158 if (dmi_name_in_vendors("FUJITSU"))
1159 dmi_walk(dmi_check_onboard_devices, &priv->adapter);
1160 }
1161 #else
1162 static void __init input_apanel_init(void) {}
1163 static void i801_probe_optional_slaves(struct i801_priv *priv) {}
1164 #endif /* CONFIG_X86 && CONFIG_DMI */
1165
1166 #if IS_ENABLED(CONFIG_I2C_MUX_GPIO) && defined CONFIG_DMI
1167 static struct i801_mux_config i801_mux_config_asus_z8_d12 = {
1168 .gpio_chip = "gpio_ich",
1169 .values = { 0x02, 0x03 },
1170 .n_values = 2,
1171 .classes = { I2C_CLASS_SPD, I2C_CLASS_SPD },
1172 .gpios = { 52, 53 },
1173 .n_gpios = 2,
1174 };
1175
1176 static struct i801_mux_config i801_mux_config_asus_z8_d18 = {
1177 .gpio_chip = "gpio_ich",
1178 .values = { 0x02, 0x03, 0x01 },
1179 .n_values = 3,
1180 .classes = { I2C_CLASS_SPD, I2C_CLASS_SPD, I2C_CLASS_SPD },
1181 .gpios = { 52, 53 },
1182 .n_gpios = 2,
1183 };
1184
1185 static const struct dmi_system_id mux_dmi_table[] = {
1186 {
1187 .matches = {
1188 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1189 DMI_MATCH(DMI_BOARD_NAME, "Z8NA-D6(C)"),
1190 },
1191 .driver_data = &i801_mux_config_asus_z8_d12,
1192 },
1193 {
1194 .matches = {
1195 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1196 DMI_MATCH(DMI_BOARD_NAME, "Z8P(N)E-D12(X)"),
1197 },
1198 .driver_data = &i801_mux_config_asus_z8_d12,
1199 },
1200 {
1201 .matches = {
1202 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1203 DMI_MATCH(DMI_BOARD_NAME, "Z8NH-D12"),
1204 },
1205 .driver_data = &i801_mux_config_asus_z8_d12,
1206 },
1207 {
1208 .matches = {
1209 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1210 DMI_MATCH(DMI_BOARD_NAME, "Z8PH-D12/IFB"),
1211 },
1212 .driver_data = &i801_mux_config_asus_z8_d12,
1213 },
1214 {
1215 .matches = {
1216 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1217 DMI_MATCH(DMI_BOARD_NAME, "Z8NR-D12"),
1218 },
1219 .driver_data = &i801_mux_config_asus_z8_d12,
1220 },
1221 {
1222 .matches = {
1223 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1224 DMI_MATCH(DMI_BOARD_NAME, "Z8P(N)H-D12"),
1225 },
1226 .driver_data = &i801_mux_config_asus_z8_d12,
1227 },
1228 {
1229 .matches = {
1230 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1231 DMI_MATCH(DMI_BOARD_NAME, "Z8PG-D18"),
1232 },
1233 .driver_data = &i801_mux_config_asus_z8_d18,
1234 },
1235 {
1236 .matches = {
1237 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1238 DMI_MATCH(DMI_BOARD_NAME, "Z8PE-D18"),
1239 },
1240 .driver_data = &i801_mux_config_asus_z8_d18,
1241 },
1242 {
1243 .matches = {
1244 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1245 DMI_MATCH(DMI_BOARD_NAME, "Z8PS-D12"),
1246 },
1247 .driver_data = &i801_mux_config_asus_z8_d12,
1248 },
1249 { }
1250 };
1251
1252 /* Setup multiplexing if needed */
1253 static int i801_add_mux(struct i801_priv *priv)
1254 {
1255 struct device *dev = &priv->adapter.dev;
1256 const struct i801_mux_config *mux_config;
1257 struct i2c_mux_gpio_platform_data gpio_data;
1258 int err;
1259
1260 if (!priv->mux_drvdata)
1261 return 0;
1262 mux_config = priv->mux_drvdata;
1263
1264 /* Prepare the platform data */
1265 memset(&gpio_data, 0, sizeof(struct i2c_mux_gpio_platform_data));
1266 gpio_data.parent = priv->adapter.nr;
1267 gpio_data.values = mux_config->values;
1268 gpio_data.n_values = mux_config->n_values;
1269 gpio_data.classes = mux_config->classes;
1270 gpio_data.gpio_chip = mux_config->gpio_chip;
1271 gpio_data.gpios = mux_config->gpios;
1272 gpio_data.n_gpios = mux_config->n_gpios;
1273 gpio_data.idle = I2C_MUX_GPIO_NO_IDLE;
1274
1275 /* Register the mux device */
1276 priv->mux_pdev = platform_device_register_data(dev, "i2c-mux-gpio",
1277 PLATFORM_DEVID_AUTO, &gpio_data,
1278 sizeof(struct i2c_mux_gpio_platform_data));
1279 if (IS_ERR(priv->mux_pdev)) {
1280 err = PTR_ERR(priv->mux_pdev);
1281 priv->mux_pdev = NULL;
1282 dev_err(dev, "Failed to register i2c-mux-gpio device\n");
1283 return err;
1284 }
1285
1286 return 0;
1287 }
1288
1289 static void i801_del_mux(struct i801_priv *priv)
1290 {
1291 if (priv->mux_pdev)
1292 platform_device_unregister(priv->mux_pdev);
1293 }
1294
1295 static unsigned int i801_get_adapter_class(struct i801_priv *priv)
1296 {
1297 const struct dmi_system_id *id;
1298 const struct i801_mux_config *mux_config;
1299 unsigned int class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
1300 int i;
1301
1302 id = dmi_first_match(mux_dmi_table);
1303 if (id) {
1304 /* Remove branch classes from trunk */
1305 mux_config = id->driver_data;
1306 for (i = 0; i < mux_config->n_values; i++)
1307 class &= ~mux_config->classes[i];
1308
1309 /* Remember for later */
1310 priv->mux_drvdata = mux_config;
1311 }
1312
1313 return class;
1314 }
1315 #else
1316 static inline int i801_add_mux(struct i801_priv *priv) { return 0; }
1317 static inline void i801_del_mux(struct i801_priv *priv) { }
1318
1319 static inline unsigned int i801_get_adapter_class(struct i801_priv *priv)
1320 {
1321 return I2C_CLASS_HWMON | I2C_CLASS_SPD;
1322 }
1323 #endif
1324
1325 static const struct itco_wdt_platform_data tco_platform_data = {
1326 .name = "Intel PCH",
1327 .version = 4,
1328 };
1329
1330 static DEFINE_SPINLOCK(p2sb_spinlock);
1331
1332 static void i801_add_tco(struct i801_priv *priv)
1333 {
1334 struct pci_dev *pci_dev = priv->pci_dev;
1335 struct resource tco_res[3], *res;
1336 struct platform_device *pdev;
1337 unsigned int devfn;
1338 u32 tco_base, tco_ctl;
1339 u32 base_addr, ctrl_val;
1340 u64 base64_addr;
1341 u8 hidden;
1342
1343 if (!(priv->features & FEATURE_TCO))
1344 return;
1345
1346 pci_read_config_dword(pci_dev, TCOBASE, &tco_base);
1347 pci_read_config_dword(pci_dev, TCOCTL, &tco_ctl);
1348 if (!(tco_ctl & TCOCTL_EN))
1349 return;
1350
1351 memset(tco_res, 0, sizeof(tco_res));
1352
1353 res = &tco_res[ICH_RES_IO_TCO];
1354 res->start = tco_base & ~1;
1355 res->end = res->start + 32 - 1;
1356 res->flags = IORESOURCE_IO;
1357
1358 /*
1359 * Power Management registers.
1360 */
1361 devfn = PCI_DEVFN(PCI_SLOT(pci_dev->devfn), 2);
1362 pci_bus_read_config_dword(pci_dev->bus, devfn, ACPIBASE, &base_addr);
1363
1364 res = &tco_res[ICH_RES_IO_SMI];
1365 res->start = (base_addr & ~1) + ACPIBASE_SMI_OFF;
1366 res->end = res->start + 3;
1367 res->flags = IORESOURCE_IO;
1368
1369 /*
1370 * Enable the ACPI I/O space.
1371 */
1372 pci_bus_read_config_dword(pci_dev->bus, devfn, ACPICTRL, &ctrl_val);
1373 ctrl_val |= ACPICTRL_EN;
1374 pci_bus_write_config_dword(pci_dev->bus, devfn, ACPICTRL, ctrl_val);
1375
1376 /*
1377 * We must access the NO_REBOOT bit over the Primary to Sideband
1378 * bridge (P2SB). The BIOS prevents the P2SB device from being
1379 * enumerated by the PCI subsystem, so we need to unhide/hide it
1380 * to lookup the P2SB BAR.
1381 */
1382 spin_lock(&p2sb_spinlock);
1383
1384 devfn = PCI_DEVFN(PCI_SLOT(pci_dev->devfn), 1);
1385
1386 /* Unhide the P2SB device, if it is hidden */
1387 pci_bus_read_config_byte(pci_dev->bus, devfn, 0xe1, &hidden);
1388 if (hidden)
1389 pci_bus_write_config_byte(pci_dev->bus, devfn, 0xe1, 0x0);
1390
1391 pci_bus_read_config_dword(pci_dev->bus, devfn, SBREG_BAR, &base_addr);
1392 base64_addr = base_addr & 0xfffffff0;
1393
1394 pci_bus_read_config_dword(pci_dev->bus, devfn, SBREG_BAR + 0x4, &base_addr);
1395 base64_addr |= (u64)base_addr << 32;
1396
1397 /* Hide the P2SB device, if it was hidden before */
1398 if (hidden)
1399 pci_bus_write_config_byte(pci_dev->bus, devfn, 0xe1, hidden);
1400 spin_unlock(&p2sb_spinlock);
1401
1402 res = &tco_res[ICH_RES_MEM_OFF];
1403 if (pci_dev->device == PCI_DEVICE_ID_INTEL_DNV_SMBUS)
1404 res->start = (resource_size_t)base64_addr + SBREG_SMBCTRL_DNV;
1405 else
1406 res->start = (resource_size_t)base64_addr + SBREG_SMBCTRL;
1407
1408 res->end = res->start + 3;
1409 res->flags = IORESOURCE_MEM;
1410
1411 pdev = platform_device_register_resndata(&pci_dev->dev, "iTCO_wdt", -1,
1412 tco_res, 3, &tco_platform_data,
1413 sizeof(tco_platform_data));
1414 if (IS_ERR(pdev)) {
1415 dev_warn(&pci_dev->dev, "failed to create iTCO device\n");
1416 return;
1417 }
1418
1419 priv->tco_pdev = pdev;
1420 }
1421
1422 #ifdef CONFIG_ACPI
1423 static bool i801_acpi_is_smbus_ioport(const struct i801_priv *priv,
1424 acpi_physical_address address)
1425 {
1426 return address >= priv->smba &&
1427 address <= pci_resource_end(priv->pci_dev, SMBBAR);
1428 }
1429
1430 static acpi_status
1431 i801_acpi_io_handler(u32 function, acpi_physical_address address, u32 bits,
1432 u64 *value, void *handler_context, void *region_context)
1433 {
1434 struct i801_priv *priv = handler_context;
1435 struct pci_dev *pdev = priv->pci_dev;
1436 acpi_status status;
1437
1438 /*
1439 * Once BIOS AML code touches the OpRegion we warn and inhibit any
1440 * further access from the driver itself. This device is now owned
1441 * by the system firmware.
1442 */
1443 mutex_lock(&priv->acpi_lock);
1444
1445 if (!priv->acpi_reserved && i801_acpi_is_smbus_ioport(priv, address)) {
1446 priv->acpi_reserved = true;
1447
1448 dev_warn(&pdev->dev, "BIOS is accessing SMBus registers\n");
1449 dev_warn(&pdev->dev, "Driver SMBus register access inhibited\n");
1450
1451 /*
1452 * BIOS is accessing the host controller so prevent it from
1453 * suspending automatically from now on.
1454 */
1455 pm_runtime_get_sync(&pdev->dev);
1456 }
1457
1458 if ((function & ACPI_IO_MASK) == ACPI_READ)
1459 status = acpi_os_read_port(address, (u32 *)value, bits);
1460 else
1461 status = acpi_os_write_port(address, (u32)*value, bits);
1462
1463 mutex_unlock(&priv->acpi_lock);
1464
1465 return status;
1466 }
1467
1468 static int i801_acpi_probe(struct i801_priv *priv)
1469 {
1470 struct acpi_device *adev;
1471 acpi_status status;
1472
1473 adev = ACPI_COMPANION(&priv->pci_dev->dev);
1474 if (adev) {
1475 status = acpi_install_address_space_handler(adev->handle,
1476 ACPI_ADR_SPACE_SYSTEM_IO, i801_acpi_io_handler,
1477 NULL, priv);
1478 if (ACPI_SUCCESS(status))
1479 return 0;
1480 }
1481
1482 return acpi_check_resource_conflict(&priv->pci_dev->resource[SMBBAR]);
1483 }
1484
1485 static void i801_acpi_remove(struct i801_priv *priv)
1486 {
1487 struct acpi_device *adev;
1488
1489 adev = ACPI_COMPANION(&priv->pci_dev->dev);
1490 if (!adev)
1491 return;
1492
1493 acpi_remove_address_space_handler(adev->handle,
1494 ACPI_ADR_SPACE_SYSTEM_IO, i801_acpi_io_handler);
1495
1496 mutex_lock(&priv->acpi_lock);
1497 if (priv->acpi_reserved)
1498 pm_runtime_put(&priv->pci_dev->dev);
1499 mutex_unlock(&priv->acpi_lock);
1500 }
1501 #else
1502 static inline int i801_acpi_probe(struct i801_priv *priv) { return 0; }
1503 static inline void i801_acpi_remove(struct i801_priv *priv) { }
1504 #endif
1505
1506 static int i801_probe(struct pci_dev *dev, const struct pci_device_id *id)
1507 {
1508 unsigned char temp;
1509 int err, i;
1510 struct i801_priv *priv;
1511
1512 priv = devm_kzalloc(&dev->dev, sizeof(*priv), GFP_KERNEL);
1513 if (!priv)
1514 return -ENOMEM;
1515
1516 i2c_set_adapdata(&priv->adapter, priv);
1517 priv->adapter.owner = THIS_MODULE;
1518 priv->adapter.class = i801_get_adapter_class(priv);
1519 priv->adapter.algo = &smbus_algorithm;
1520 priv->adapter.dev.parent = &dev->dev;
1521 ACPI_COMPANION_SET(&priv->adapter.dev, ACPI_COMPANION(&dev->dev));
1522 priv->adapter.retries = 3;
1523 mutex_init(&priv->acpi_lock);
1524
1525 priv->pci_dev = dev;
1526 switch (dev->device) {
1527 case PCI_DEVICE_ID_INTEL_SUNRISEPOINT_H_SMBUS:
1528 case PCI_DEVICE_ID_INTEL_SUNRISEPOINT_LP_SMBUS:
1529 case PCI_DEVICE_ID_INTEL_CANNONLAKE_H_SMBUS:
1530 case PCI_DEVICE_ID_INTEL_CANNONLAKE_LP_SMBUS:
1531 case PCI_DEVICE_ID_INTEL_LEWISBURG_SMBUS:
1532 case PCI_DEVICE_ID_INTEL_LEWISBURG_SSKU_SMBUS:
1533 case PCI_DEVICE_ID_INTEL_CDF_SMBUS:
1534 case PCI_DEVICE_ID_INTEL_DNV_SMBUS:
1535 case PCI_DEVICE_ID_INTEL_KABYLAKE_PCH_H_SMBUS:
1536 case PCI_DEVICE_ID_INTEL_ICELAKE_LP_SMBUS:
1537 priv->features |= FEATURE_I2C_BLOCK_READ;
1538 priv->features |= FEATURE_IRQ;
1539 priv->features |= FEATURE_SMBUS_PEC;
1540 priv->features |= FEATURE_BLOCK_BUFFER;
1541 /* If we have ACPI based watchdog use that instead */
1542 if (!acpi_has_watchdog())
1543 priv->features |= FEATURE_TCO;
1544 priv->features |= FEATURE_HOST_NOTIFY;
1545 break;
1546
1547 case PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF0:
1548 case PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF1:
1549 case PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF2:
1550 case PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS0:
1551 case PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS1:
1552 case PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS2:
1553 priv->features |= FEATURE_IDF;
1554 /* fall through */
1555 default:
1556 priv->features |= FEATURE_I2C_BLOCK_READ;
1557 priv->features |= FEATURE_IRQ;
1558 /* fall through */
1559 case PCI_DEVICE_ID_INTEL_82801DB_3:
1560 priv->features |= FEATURE_SMBUS_PEC;
1561 priv->features |= FEATURE_BLOCK_BUFFER;
1562 /* fall through */
1563 case PCI_DEVICE_ID_INTEL_82801CA_3:
1564 priv->features |= FEATURE_HOST_NOTIFY;
1565 /* fall through */
1566 case PCI_DEVICE_ID_INTEL_82801BA_2:
1567 case PCI_DEVICE_ID_INTEL_82801AB_3:
1568 case PCI_DEVICE_ID_INTEL_82801AA_3:
1569 break;
1570 }
1571
1572 /* Disable features on user request */
1573 for (i = 0; i < ARRAY_SIZE(i801_feature_names); i++) {
1574 if (priv->features & disable_features & (1 << i))
1575 dev_notice(&dev->dev, "%s disabled by user\n",
1576 i801_feature_names[i]);
1577 }
1578 priv->features &= ~disable_features;
1579
1580 err = pcim_enable_device(dev);
1581 if (err) {
1582 dev_err(&dev->dev, "Failed to enable SMBus PCI device (%d)\n",
1583 err);
1584 return err;
1585 }
1586 pcim_pin_device(dev);
1587
1588 /* Determine the address of the SMBus area */
1589 priv->smba = pci_resource_start(dev, SMBBAR);
1590 if (!priv->smba) {
1591 dev_err(&dev->dev,
1592 "SMBus base address uninitialized, upgrade BIOS\n");
1593 return -ENODEV;
1594 }
1595
1596 if (i801_acpi_probe(priv))
1597 return -ENODEV;
1598
1599 err = pcim_iomap_regions(dev, 1 << SMBBAR,
1600 dev_driver_string(&dev->dev));
1601 if (err) {
1602 dev_err(&dev->dev,
1603 "Failed to request SMBus region 0x%lx-0x%Lx\n",
1604 priv->smba,
1605 (unsigned long long)pci_resource_end(dev, SMBBAR));
1606 i801_acpi_remove(priv);
1607 return err;
1608 }
1609
1610 pci_read_config_byte(priv->pci_dev, SMBHSTCFG, &temp);
1611 priv->original_hstcfg = temp;
1612 temp &= ~SMBHSTCFG_I2C_EN; /* SMBus timing */
1613 if (!(temp & SMBHSTCFG_HST_EN)) {
1614 dev_info(&dev->dev, "Enabling SMBus device\n");
1615 temp |= SMBHSTCFG_HST_EN;
1616 }
1617 pci_write_config_byte(priv->pci_dev, SMBHSTCFG, temp);
1618
1619 if (temp & SMBHSTCFG_SMB_SMI_EN) {
1620 dev_dbg(&dev->dev, "SMBus using interrupt SMI#\n");
1621 /* Disable SMBus interrupt feature if SMBus using SMI# */
1622 priv->features &= ~FEATURE_IRQ;
1623 }
1624 if (temp & SMBHSTCFG_SPD_WD)
1625 dev_info(&dev->dev, "SPD Write Disable is set\n");
1626
1627 /* Clear special mode bits */
1628 if (priv->features & (FEATURE_SMBUS_PEC | FEATURE_BLOCK_BUFFER))
1629 outb_p(inb_p(SMBAUXCTL(priv)) &
1630 ~(SMBAUXCTL_CRC | SMBAUXCTL_E32B), SMBAUXCTL(priv));
1631
1632 /* Remember original Host Notify setting */
1633 if (priv->features & FEATURE_HOST_NOTIFY)
1634 priv->original_slvcmd = inb_p(SMBSLVCMD(priv));
1635
1636 /* Default timeout in interrupt mode: 200 ms */
1637 priv->adapter.timeout = HZ / 5;
1638
1639 if (dev->irq == IRQ_NOTCONNECTED)
1640 priv->features &= ~FEATURE_IRQ;
1641
1642 if (priv->features & FEATURE_IRQ) {
1643 u16 pcictl, pcists;
1644
1645 /* Complain if an interrupt is already pending */
1646 pci_read_config_word(priv->pci_dev, SMBPCISTS, &pcists);
1647 if (pcists & SMBPCISTS_INTS)
1648 dev_warn(&dev->dev, "An interrupt is pending!\n");
1649
1650 /* Check if interrupts have been disabled */
1651 pci_read_config_word(priv->pci_dev, SMBPCICTL, &pcictl);
1652 if (pcictl & SMBPCICTL_INTDIS) {
1653 dev_info(&dev->dev, "Interrupts are disabled\n");
1654 priv->features &= ~FEATURE_IRQ;
1655 }
1656 }
1657
1658 if (priv->features & FEATURE_IRQ) {
1659 init_waitqueue_head(&priv->waitq);
1660
1661 err = devm_request_irq(&dev->dev, dev->irq, i801_isr,
1662 IRQF_SHARED,
1663 dev_driver_string(&dev->dev), priv);
1664 if (err) {
1665 dev_err(&dev->dev, "Failed to allocate irq %d: %d\n",
1666 dev->irq, err);
1667 priv->features &= ~FEATURE_IRQ;
1668 }
1669 }
1670 dev_info(&dev->dev, "SMBus using %s\n",
1671 priv->features & FEATURE_IRQ ? "PCI interrupt" : "polling");
1672
1673 i801_add_tco(priv);
1674
1675 snprintf(priv->adapter.name, sizeof(priv->adapter.name),
1676 "SMBus I801 adapter at %04lx", priv->smba);
1677 err = i2c_add_adapter(&priv->adapter);
1678 if (err) {
1679 i801_acpi_remove(priv);
1680 return err;
1681 }
1682
1683 i801_enable_host_notify(&priv->adapter);
1684
1685 i801_probe_optional_slaves(priv);
1686 /* We ignore errors - multiplexing is optional */
1687 i801_add_mux(priv);
1688
1689 pci_set_drvdata(dev, priv);
1690
1691 pm_runtime_set_autosuspend_delay(&dev->dev, 1000);
1692 pm_runtime_use_autosuspend(&dev->dev);
1693 pm_runtime_put_autosuspend(&dev->dev);
1694 pm_runtime_allow(&dev->dev);
1695
1696 return 0;
1697 }
1698
1699 static void i801_remove(struct pci_dev *dev)
1700 {
1701 struct i801_priv *priv = pci_get_drvdata(dev);
1702
1703 pm_runtime_forbid(&dev->dev);
1704 pm_runtime_get_noresume(&dev->dev);
1705
1706 i801_disable_host_notify(priv);
1707 i801_del_mux(priv);
1708 i2c_del_adapter(&priv->adapter);
1709 i801_acpi_remove(priv);
1710 pci_write_config_byte(dev, SMBHSTCFG, priv->original_hstcfg);
1711
1712 platform_device_unregister(priv->tco_pdev);
1713
1714 /*
1715 * do not call pci_disable_device(dev) since it can cause hard hangs on
1716 * some systems during power-off (eg. Fujitsu-Siemens Lifebook E8010)
1717 */
1718 }
1719
1720 static void i801_shutdown(struct pci_dev *dev)
1721 {
1722 struct i801_priv *priv = pci_get_drvdata(dev);
1723
1724 /* Restore config registers to avoid hard hang on some systems */
1725 i801_disable_host_notify(priv);
1726 pci_write_config_byte(dev, SMBHSTCFG, priv->original_hstcfg);
1727 }
1728
1729 #ifdef CONFIG_PM_SLEEP
1730 static int i801_suspend(struct device *dev)
1731 {
1732 struct pci_dev *pci_dev = to_pci_dev(dev);
1733 struct i801_priv *priv = pci_get_drvdata(pci_dev);
1734
1735 pci_write_config_byte(pci_dev, SMBHSTCFG, priv->original_hstcfg);
1736 return 0;
1737 }
1738
1739 static int i801_resume(struct device *dev)
1740 {
1741 struct pci_dev *pci_dev = to_pci_dev(dev);
1742 struct i801_priv *priv = pci_get_drvdata(pci_dev);
1743
1744 i801_enable_host_notify(&priv->adapter);
1745
1746 return 0;
1747 }
1748 #endif
1749
1750 static SIMPLE_DEV_PM_OPS(i801_pm_ops, i801_suspend, i801_resume);
1751
1752 static struct pci_driver i801_driver = {
1753 .name = "i801_smbus",
1754 .id_table = i801_ids,
1755 .probe = i801_probe,
1756 .remove = i801_remove,
1757 .shutdown = i801_shutdown,
1758 .driver = {
1759 .pm = &i801_pm_ops,
1760 },
1761 };
1762
1763 static int __init i2c_i801_init(void)
1764 {
1765 if (dmi_name_in_vendors("FUJITSU"))
1766 input_apanel_init();
1767 return pci_register_driver(&i801_driver);
1768 }
1769
1770 static void __exit i2c_i801_exit(void)
1771 {
1772 pci_unregister_driver(&i801_driver);
1773 }
1774
1775 MODULE_AUTHOR("Mark D. Studebaker <mdsxyz123@yahoo.com>, Jean Delvare <jdelvare@suse.de>");
1776 MODULE_DESCRIPTION("I801 SMBus driver");
1777 MODULE_LICENSE("GPL");
1778
1779 module_init(i2c_i801_init);
1780 module_exit(i2c_i801_exit);
Linux with added FPC-III support