Merge tag 'spi-v4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi
[sfrench/cifs-2.6.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  *
68  * Features supported by this driver:
69  * Software PEC                         no
70  * Hardware PEC                         yes
71  * Block buffer                         yes
72  * Block process call transaction       no
73  * I2C block read transaction           yes (doesn't use the block buffer)
74  * Slave mode                           no
75  * Interrupt processing                 yes
76  *
77  * See the file Documentation/i2c/busses/i2c-i801 for details.
78  */
79
80 #include <linux/interrupt.h>
81 #include <linux/module.h>
82 #include <linux/pci.h>
83 #include <linux/kernel.h>
84 #include <linux/stddef.h>
85 #include <linux/delay.h>
86 #include <linux/ioport.h>
87 #include <linux/init.h>
88 #include <linux/i2c.h>
89 #include <linux/acpi.h>
90 #include <linux/io.h>
91 #include <linux/dmi.h>
92 #include <linux/slab.h>
93 #include <linux/wait.h>
94 #include <linux/err.h>
95 #include <linux/platform_device.h>
96 #include <linux/platform_data/itco_wdt.h>
97 #include <linux/pm_runtime.h>
98
99 #if (defined CONFIG_I2C_MUX_GPIO || defined CONFIG_I2C_MUX_GPIO_MODULE) && \
100                 defined CONFIG_DMI
101 #include <linux/gpio.h>
102 #include <linux/i2c-mux-gpio.h>
103 #endif
104
105 /* I801 SMBus address offsets */
106 #define SMBHSTSTS(p)    (0 + (p)->smba)
107 #define SMBHSTCNT(p)    (2 + (p)->smba)
108 #define SMBHSTCMD(p)    (3 + (p)->smba)
109 #define SMBHSTADD(p)    (4 + (p)->smba)
110 #define SMBHSTDAT0(p)   (5 + (p)->smba)
111 #define SMBHSTDAT1(p)   (6 + (p)->smba)
112 #define SMBBLKDAT(p)    (7 + (p)->smba)
113 #define SMBPEC(p)       (8 + (p)->smba)         /* ICH3 and later */
114 #define SMBAUXSTS(p)    (12 + (p)->smba)        /* ICH4 and later */
115 #define SMBAUXCTL(p)    (13 + (p)->smba)        /* ICH4 and later */
116
117 /* PCI Address Constants */
118 #define SMBBAR          4
119 #define SMBPCICTL       0x004
120 #define SMBPCISTS       0x006
121 #define SMBHSTCFG       0x040
122 #define TCOBASE         0x050
123 #define TCOCTL          0x054
124
125 #define ACPIBASE                0x040
126 #define ACPIBASE_SMI_OFF        0x030
127 #define ACPICTRL                0x044
128 #define ACPICTRL_EN             0x080
129
130 #define SBREG_BAR               0x10
131 #define SBREG_SMBCTRL           0xc6000c
132
133 /* Host status bits for SMBPCISTS */
134 #define SMBPCISTS_INTS          0x08
135
136 /* Control bits for SMBPCICTL */
137 #define SMBPCICTL_INTDIS        0x0400
138
139 /* Host configuration bits for SMBHSTCFG */
140 #define SMBHSTCFG_HST_EN        1
141 #define SMBHSTCFG_SMB_SMI_EN    2
142 #define SMBHSTCFG_I2C_EN        4
143
144 /* TCO configuration bits for TCOCTL */
145 #define TCOCTL_EN               0x0100
146
147 /* Auxiliary control register bits, ICH4+ only */
148 #define SMBAUXCTL_CRC           1
149 #define SMBAUXCTL_E32B          2
150
151 /* Other settings */
152 #define MAX_RETRIES             400
153
154 /* I801 command constants */
155 #define I801_QUICK              0x00
156 #define I801_BYTE               0x04
157 #define I801_BYTE_DATA          0x08
158 #define I801_WORD_DATA          0x0C
159 #define I801_PROC_CALL          0x10    /* unimplemented */
160 #define I801_BLOCK_DATA         0x14
161 #define I801_I2C_BLOCK_DATA     0x18    /* ICH5 and later */
162
163 /* I801 Host Control register bits */
164 #define SMBHSTCNT_INTREN        0x01
165 #define SMBHSTCNT_KILL          0x02
166 #define SMBHSTCNT_LAST_BYTE     0x20
167 #define SMBHSTCNT_START         0x40
168 #define SMBHSTCNT_PEC_EN        0x80    /* ICH3 and later */
169
170 /* I801 Hosts Status register bits */
171 #define SMBHSTSTS_BYTE_DONE     0x80
172 #define SMBHSTSTS_INUSE_STS     0x40
173 #define SMBHSTSTS_SMBALERT_STS  0x20
174 #define SMBHSTSTS_FAILED        0x10
175 #define SMBHSTSTS_BUS_ERR       0x08
176 #define SMBHSTSTS_DEV_ERR       0x04
177 #define SMBHSTSTS_INTR          0x02
178 #define SMBHSTSTS_HOST_BUSY     0x01
179
180 #define STATUS_ERROR_FLAGS      (SMBHSTSTS_FAILED | SMBHSTSTS_BUS_ERR | \
181                                  SMBHSTSTS_DEV_ERR)
182
183 #define STATUS_FLAGS            (SMBHSTSTS_BYTE_DONE | SMBHSTSTS_INTR | \
184                                  STATUS_ERROR_FLAGS)
185
186 /* Older devices have their ID defined in <linux/pci_ids.h> */
187 #define PCI_DEVICE_ID_INTEL_BAYTRAIL_SMBUS              0x0f12
188 #define PCI_DEVICE_ID_INTEL_DNV_SMBUS                   0x19df
189 #define PCI_DEVICE_ID_INTEL_COUGARPOINT_SMBUS           0x1c22
190 #define PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS              0x1d22
191 /* Patsburg also has three 'Integrated Device Function' SMBus controllers */
192 #define PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF0         0x1d70
193 #define PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF1         0x1d71
194 #define PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF2         0x1d72
195 #define PCI_DEVICE_ID_INTEL_PANTHERPOINT_SMBUS          0x1e22
196 #define PCI_DEVICE_ID_INTEL_AVOTON_SMBUS                0x1f3c
197 #define PCI_DEVICE_ID_INTEL_BRASWELL_SMBUS              0x2292
198 #define PCI_DEVICE_ID_INTEL_DH89XXCC_SMBUS              0x2330
199 #define PCI_DEVICE_ID_INTEL_COLETOCREEK_SMBUS           0x23b0
200 #define PCI_DEVICE_ID_INTEL_5_3400_SERIES_SMBUS         0x3b30
201 #define PCI_DEVICE_ID_INTEL_BROXTON_SMBUS               0x5ad4
202 #define PCI_DEVICE_ID_INTEL_LYNXPOINT_SMBUS             0x8c22
203 #define PCI_DEVICE_ID_INTEL_WILDCATPOINT_SMBUS          0x8ca2
204 #define PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS             0x8d22
205 #define PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS0         0x8d7d
206 #define PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS1         0x8d7e
207 #define PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS2         0x8d7f
208 #define PCI_DEVICE_ID_INTEL_LYNXPOINT_LP_SMBUS          0x9c22
209 #define PCI_DEVICE_ID_INTEL_WILDCATPOINT_LP_SMBUS       0x9ca2
210 #define PCI_DEVICE_ID_INTEL_SUNRISEPOINT_LP_SMBUS       0x9d23
211 #define PCI_DEVICE_ID_INTEL_SUNRISEPOINT_H_SMBUS        0xa123
212 #define PCI_DEVICE_ID_INTEL_LEWISBURG_SMBUS             0xa1a3
213 #define PCI_DEVICE_ID_INTEL_LEWISBURG_SSKU_SMBUS        0xa223
214
215 struct i801_mux_config {
216         char *gpio_chip;
217         unsigned values[3];
218         int n_values;
219         unsigned classes[3];
220         unsigned gpios[2];              /* Relative to gpio_chip->base */
221         int n_gpios;
222 };
223
224 struct i801_priv {
225         struct i2c_adapter adapter;
226         unsigned long smba;
227         unsigned char original_hstcfg;
228         struct pci_dev *pci_dev;
229         unsigned int features;
230
231         /* isr processing */
232         wait_queue_head_t waitq;
233         u8 status;
234
235         /* Command state used by isr for byte-by-byte block transactions */
236         u8 cmd;
237         bool is_read;
238         int count;
239         int len;
240         u8 *data;
241
242 #if (defined CONFIG_I2C_MUX_GPIO || defined CONFIG_I2C_MUX_GPIO_MODULE) && \
243                 defined CONFIG_DMI
244         const struct i801_mux_config *mux_drvdata;
245         struct platform_device *mux_pdev;
246 #endif
247         struct platform_device *tco_pdev;
248
249         /*
250          * If set to true the host controller registers are reserved for
251          * ACPI AML use. Protected by acpi_lock.
252          */
253         bool acpi_reserved;
254         struct mutex acpi_lock;
255 };
256
257 #define FEATURE_SMBUS_PEC       (1 << 0)
258 #define FEATURE_BLOCK_BUFFER    (1 << 1)
259 #define FEATURE_BLOCK_PROC      (1 << 2)
260 #define FEATURE_I2C_BLOCK_READ  (1 << 3)
261 #define FEATURE_IRQ             (1 << 4)
262 /* Not really a feature, but it's convenient to handle it as such */
263 #define FEATURE_IDF             (1 << 15)
264 #define FEATURE_TCO             (1 << 16)
265
266 static const char *i801_feature_names[] = {
267         "SMBus PEC",
268         "Block buffer",
269         "Block process call",
270         "I2C block read",
271         "Interrupt",
272 };
273
274 static unsigned int disable_features;
275 module_param(disable_features, uint, S_IRUGO | S_IWUSR);
276 MODULE_PARM_DESC(disable_features, "Disable selected driver features:\n"
277         "\t\t  0x01  disable SMBus PEC\n"
278         "\t\t  0x02  disable the block buffer\n"
279         "\t\t  0x08  disable the I2C block read functionality\n"
280         "\t\t  0x10  don't use interrupts ");
281
282 /* Make sure the SMBus host is ready to start transmitting.
283    Return 0 if it is, -EBUSY if it is not. */
284 static int i801_check_pre(struct i801_priv *priv)
285 {
286         int status;
287
288         status = inb_p(SMBHSTSTS(priv));
289         if (status & SMBHSTSTS_HOST_BUSY) {
290                 dev_err(&priv->pci_dev->dev, "SMBus is busy, can't use it!\n");
291                 return -EBUSY;
292         }
293
294         status &= STATUS_FLAGS;
295         if (status) {
296                 dev_dbg(&priv->pci_dev->dev, "Clearing status flags (%02x)\n",
297                         status);
298                 outb_p(status, SMBHSTSTS(priv));
299                 status = inb_p(SMBHSTSTS(priv)) & STATUS_FLAGS;
300                 if (status) {
301                         dev_err(&priv->pci_dev->dev,
302                                 "Failed clearing status flags (%02x)\n",
303                                 status);
304                         return -EBUSY;
305                 }
306         }
307
308         return 0;
309 }
310
311 /*
312  * Convert the status register to an error code, and clear it.
313  * Note that status only contains the bits we want to clear, not the
314  * actual register value.
315  */
316 static int i801_check_post(struct i801_priv *priv, int status)
317 {
318         int result = 0;
319
320         /*
321          * If the SMBus is still busy, we give up
322          * Note: This timeout condition only happens when using polling
323          * transactions.  For interrupt operation, NAK/timeout is indicated by
324          * DEV_ERR.
325          */
326         if (unlikely(status < 0)) {
327                 dev_err(&priv->pci_dev->dev, "Transaction timeout\n");
328                 /* try to stop the current command */
329                 dev_dbg(&priv->pci_dev->dev, "Terminating the current operation\n");
330                 outb_p(inb_p(SMBHSTCNT(priv)) | SMBHSTCNT_KILL,
331                        SMBHSTCNT(priv));
332                 usleep_range(1000, 2000);
333                 outb_p(inb_p(SMBHSTCNT(priv)) & (~SMBHSTCNT_KILL),
334                        SMBHSTCNT(priv));
335
336                 /* Check if it worked */
337                 status = inb_p(SMBHSTSTS(priv));
338                 if ((status & SMBHSTSTS_HOST_BUSY) ||
339                     !(status & SMBHSTSTS_FAILED))
340                         dev_err(&priv->pci_dev->dev,
341                                 "Failed terminating the transaction\n");
342                 outb_p(STATUS_FLAGS, SMBHSTSTS(priv));
343                 return -ETIMEDOUT;
344         }
345
346         if (status & SMBHSTSTS_FAILED) {
347                 result = -EIO;
348                 dev_err(&priv->pci_dev->dev, "Transaction failed\n");
349         }
350         if (status & SMBHSTSTS_DEV_ERR) {
351                 result = -ENXIO;
352                 dev_dbg(&priv->pci_dev->dev, "No response\n");
353         }
354         if (status & SMBHSTSTS_BUS_ERR) {
355                 result = -EAGAIN;
356                 dev_dbg(&priv->pci_dev->dev, "Lost arbitration\n");
357         }
358
359         /* Clear status flags except BYTE_DONE, to be cleared by caller */
360         outb_p(status, SMBHSTSTS(priv));
361
362         return result;
363 }
364
365 /* Wait for BUSY being cleared and either INTR or an error flag being set */
366 static int i801_wait_intr(struct i801_priv *priv)
367 {
368         int timeout = 0;
369         int status;
370
371         /* We will always wait for a fraction of a second! */
372         do {
373                 usleep_range(250, 500);
374                 status = inb_p(SMBHSTSTS(priv));
375         } while (((status & SMBHSTSTS_HOST_BUSY) ||
376                   !(status & (STATUS_ERROR_FLAGS | SMBHSTSTS_INTR))) &&
377                  (timeout++ < MAX_RETRIES));
378
379         if (timeout > MAX_RETRIES) {
380                 dev_dbg(&priv->pci_dev->dev, "INTR Timeout!\n");
381                 return -ETIMEDOUT;
382         }
383         return status & (STATUS_ERROR_FLAGS | SMBHSTSTS_INTR);
384 }
385
386 /* Wait for either BYTE_DONE or an error flag being set */
387 static int i801_wait_byte_done(struct i801_priv *priv)
388 {
389         int timeout = 0;
390         int status;
391
392         /* We will always wait for a fraction of a second! */
393         do {
394                 usleep_range(250, 500);
395                 status = inb_p(SMBHSTSTS(priv));
396         } while (!(status & (STATUS_ERROR_FLAGS | SMBHSTSTS_BYTE_DONE)) &&
397                  (timeout++ < MAX_RETRIES));
398
399         if (timeout > MAX_RETRIES) {
400                 dev_dbg(&priv->pci_dev->dev, "BYTE_DONE Timeout!\n");
401                 return -ETIMEDOUT;
402         }
403         return status & STATUS_ERROR_FLAGS;
404 }
405
406 static int i801_transaction(struct i801_priv *priv, int xact)
407 {
408         int status;
409         int result;
410         const struct i2c_adapter *adap = &priv->adapter;
411
412         result = i801_check_pre(priv);
413         if (result < 0)
414                 return result;
415
416         if (priv->features & FEATURE_IRQ) {
417                 outb_p(xact | SMBHSTCNT_INTREN | SMBHSTCNT_START,
418                        SMBHSTCNT(priv));
419                 result = wait_event_timeout(priv->waitq,
420                                             (status = priv->status),
421                                             adap->timeout);
422                 if (!result) {
423                         status = -ETIMEDOUT;
424                         dev_warn(&priv->pci_dev->dev,
425                                  "Timeout waiting for interrupt!\n");
426                 }
427                 priv->status = 0;
428                 return i801_check_post(priv, status);
429         }
430
431         /* the current contents of SMBHSTCNT can be overwritten, since PEC,
432          * SMBSCMD are passed in xact */
433         outb_p(xact | SMBHSTCNT_START, SMBHSTCNT(priv));
434
435         status = i801_wait_intr(priv);
436         return i801_check_post(priv, status);
437 }
438
439 static int i801_block_transaction_by_block(struct i801_priv *priv,
440                                            union i2c_smbus_data *data,
441                                            char read_write, int hwpec)
442 {
443         int i, len;
444         int status;
445
446         inb_p(SMBHSTCNT(priv)); /* reset the data buffer index */
447
448         /* Use 32-byte buffer to process this transaction */
449         if (read_write == I2C_SMBUS_WRITE) {
450                 len = data->block[0];
451                 outb_p(len, SMBHSTDAT0(priv));
452                 for (i = 0; i < len; i++)
453                         outb_p(data->block[i+1], SMBBLKDAT(priv));
454         }
455
456         status = i801_transaction(priv, I801_BLOCK_DATA |
457                                   (hwpec ? SMBHSTCNT_PEC_EN : 0));
458         if (status)
459                 return status;
460
461         if (read_write == I2C_SMBUS_READ) {
462                 len = inb_p(SMBHSTDAT0(priv));
463                 if (len < 1 || len > I2C_SMBUS_BLOCK_MAX)
464                         return -EPROTO;
465
466                 data->block[0] = len;
467                 for (i = 0; i < len; i++)
468                         data->block[i + 1] = inb_p(SMBBLKDAT(priv));
469         }
470         return 0;
471 }
472
473 static void i801_isr_byte_done(struct i801_priv *priv)
474 {
475         if (priv->is_read) {
476                 /* For SMBus block reads, length is received with first byte */
477                 if (((priv->cmd & 0x1c) == I801_BLOCK_DATA) &&
478                     (priv->count == 0)) {
479                         priv->len = inb_p(SMBHSTDAT0(priv));
480                         if (priv->len < 1 || priv->len > I2C_SMBUS_BLOCK_MAX) {
481                                 dev_err(&priv->pci_dev->dev,
482                                         "Illegal SMBus block read size %d\n",
483                                         priv->len);
484                                 /* FIXME: Recover */
485                                 priv->len = I2C_SMBUS_BLOCK_MAX;
486                         } else {
487                                 dev_dbg(&priv->pci_dev->dev,
488                                         "SMBus block read size is %d\n",
489                                         priv->len);
490                         }
491                         priv->data[-1] = priv->len;
492                 }
493
494                 /* Read next byte */
495                 if (priv->count < priv->len)
496                         priv->data[priv->count++] = inb(SMBBLKDAT(priv));
497                 else
498                         dev_dbg(&priv->pci_dev->dev,
499                                 "Discarding extra byte on block read\n");
500
501                 /* Set LAST_BYTE for last byte of read transaction */
502                 if (priv->count == priv->len - 1)
503                         outb_p(priv->cmd | SMBHSTCNT_LAST_BYTE,
504                                SMBHSTCNT(priv));
505         } else if (priv->count < priv->len - 1) {
506                 /* Write next byte, except for IRQ after last byte */
507                 outb_p(priv->data[++priv->count], SMBBLKDAT(priv));
508         }
509
510         /* Clear BYTE_DONE to continue with next byte */
511         outb_p(SMBHSTSTS_BYTE_DONE, SMBHSTSTS(priv));
512 }
513
514 /*
515  * There are two kinds of interrupts:
516  *
517  * 1) i801 signals transaction completion with one of these interrupts:
518  *      INTR - Success
519  *      DEV_ERR - Invalid command, NAK or communication timeout
520  *      BUS_ERR - SMI# transaction collision
521  *      FAILED - transaction was canceled due to a KILL request
522  *    When any of these occur, update ->status and wake up the waitq.
523  *    ->status must be cleared before kicking off the next transaction.
524  *
525  * 2) For byte-by-byte (I2C read/write) transactions, one BYTE_DONE interrupt
526  *    occurs for each byte of a byte-by-byte to prepare the next byte.
527  */
528 static irqreturn_t i801_isr(int irq, void *dev_id)
529 {
530         struct i801_priv *priv = dev_id;
531         u16 pcists;
532         u8 status;
533
534         /* Confirm this is our interrupt */
535         pci_read_config_word(priv->pci_dev, SMBPCISTS, &pcists);
536         if (!(pcists & SMBPCISTS_INTS))
537                 return IRQ_NONE;
538
539         status = inb_p(SMBHSTSTS(priv));
540         if (status & SMBHSTSTS_BYTE_DONE)
541                 i801_isr_byte_done(priv);
542
543         /*
544          * Clear irq sources and report transaction result.
545          * ->status must be cleared before the next transaction is started.
546          */
547         status &= SMBHSTSTS_INTR | STATUS_ERROR_FLAGS;
548         if (status) {
549                 outb_p(status, SMBHSTSTS(priv));
550                 priv->status |= status;
551                 wake_up(&priv->waitq);
552         }
553
554         return IRQ_HANDLED;
555 }
556
557 /*
558  * For "byte-by-byte" block transactions:
559  *   I2C write uses cmd=I801_BLOCK_DATA, I2C_EN=1
560  *   I2C read uses cmd=I801_I2C_BLOCK_DATA
561  */
562 static int i801_block_transaction_byte_by_byte(struct i801_priv *priv,
563                                                union i2c_smbus_data *data,
564                                                char read_write, int command,
565                                                int hwpec)
566 {
567         int i, len;
568         int smbcmd;
569         int status;
570         int result;
571         const struct i2c_adapter *adap = &priv->adapter;
572
573         result = i801_check_pre(priv);
574         if (result < 0)
575                 return result;
576
577         len = data->block[0];
578
579         if (read_write == I2C_SMBUS_WRITE) {
580                 outb_p(len, SMBHSTDAT0(priv));
581                 outb_p(data->block[1], SMBBLKDAT(priv));
582         }
583
584         if (command == I2C_SMBUS_I2C_BLOCK_DATA &&
585             read_write == I2C_SMBUS_READ)
586                 smbcmd = I801_I2C_BLOCK_DATA;
587         else
588                 smbcmd = I801_BLOCK_DATA;
589
590         if (priv->features & FEATURE_IRQ) {
591                 priv->is_read = (read_write == I2C_SMBUS_READ);
592                 if (len == 1 && priv->is_read)
593                         smbcmd |= SMBHSTCNT_LAST_BYTE;
594                 priv->cmd = smbcmd | SMBHSTCNT_INTREN;
595                 priv->len = len;
596                 priv->count = 0;
597                 priv->data = &data->block[1];
598
599                 outb_p(priv->cmd | SMBHSTCNT_START, SMBHSTCNT(priv));
600                 result = wait_event_timeout(priv->waitq,
601                                             (status = priv->status),
602                                             adap->timeout);
603                 if (!result) {
604                         status = -ETIMEDOUT;
605                         dev_warn(&priv->pci_dev->dev,
606                                  "Timeout waiting for interrupt!\n");
607                 }
608                 priv->status = 0;
609                 return i801_check_post(priv, status);
610         }
611
612         for (i = 1; i <= len; i++) {
613                 if (i == len && read_write == I2C_SMBUS_READ)
614                         smbcmd |= SMBHSTCNT_LAST_BYTE;
615                 outb_p(smbcmd, SMBHSTCNT(priv));
616
617                 if (i == 1)
618                         outb_p(inb(SMBHSTCNT(priv)) | SMBHSTCNT_START,
619                                SMBHSTCNT(priv));
620
621                 status = i801_wait_byte_done(priv);
622                 if (status)
623                         goto exit;
624
625                 if (i == 1 && read_write == I2C_SMBUS_READ
626                  && command != I2C_SMBUS_I2C_BLOCK_DATA) {
627                         len = inb_p(SMBHSTDAT0(priv));
628                         if (len < 1 || len > I2C_SMBUS_BLOCK_MAX) {
629                                 dev_err(&priv->pci_dev->dev,
630                                         "Illegal SMBus block read size %d\n",
631                                         len);
632                                 /* Recover */
633                                 while (inb_p(SMBHSTSTS(priv)) &
634                                        SMBHSTSTS_HOST_BUSY)
635                                         outb_p(SMBHSTSTS_BYTE_DONE,
636                                                SMBHSTSTS(priv));
637                                 outb_p(SMBHSTSTS_INTR, SMBHSTSTS(priv));
638                                 return -EPROTO;
639                         }
640                         data->block[0] = len;
641                 }
642
643                 /* Retrieve/store value in SMBBLKDAT */
644                 if (read_write == I2C_SMBUS_READ)
645                         data->block[i] = inb_p(SMBBLKDAT(priv));
646                 if (read_write == I2C_SMBUS_WRITE && i+1 <= len)
647                         outb_p(data->block[i+1], SMBBLKDAT(priv));
648
649                 /* signals SMBBLKDAT ready */
650                 outb_p(SMBHSTSTS_BYTE_DONE, SMBHSTSTS(priv));
651         }
652
653         status = i801_wait_intr(priv);
654 exit:
655         return i801_check_post(priv, status);
656 }
657
658 static int i801_set_block_buffer_mode(struct i801_priv *priv)
659 {
660         outb_p(inb_p(SMBAUXCTL(priv)) | SMBAUXCTL_E32B, SMBAUXCTL(priv));
661         if ((inb_p(SMBAUXCTL(priv)) & SMBAUXCTL_E32B) == 0)
662                 return -EIO;
663         return 0;
664 }
665
666 /* Block transaction function */
667 static int i801_block_transaction(struct i801_priv *priv,
668                                   union i2c_smbus_data *data, char read_write,
669                                   int command, int hwpec)
670 {
671         int result = 0;
672         unsigned char hostc;
673
674         if (command == I2C_SMBUS_I2C_BLOCK_DATA) {
675                 if (read_write == I2C_SMBUS_WRITE) {
676                         /* set I2C_EN bit in configuration register */
677                         pci_read_config_byte(priv->pci_dev, SMBHSTCFG, &hostc);
678                         pci_write_config_byte(priv->pci_dev, SMBHSTCFG,
679                                               hostc | SMBHSTCFG_I2C_EN);
680                 } else if (!(priv->features & FEATURE_I2C_BLOCK_READ)) {
681                         dev_err(&priv->pci_dev->dev,
682                                 "I2C block read is unsupported!\n");
683                         return -EOPNOTSUPP;
684                 }
685         }
686
687         if (read_write == I2C_SMBUS_WRITE
688          || command == I2C_SMBUS_I2C_BLOCK_DATA) {
689                 if (data->block[0] < 1)
690                         data->block[0] = 1;
691                 if (data->block[0] > I2C_SMBUS_BLOCK_MAX)
692                         data->block[0] = I2C_SMBUS_BLOCK_MAX;
693         } else {
694                 data->block[0] = 32;    /* max for SMBus block reads */
695         }
696
697         /* Experience has shown that the block buffer can only be used for
698            SMBus (not I2C) block transactions, even though the datasheet
699            doesn't mention this limitation. */
700         if ((priv->features & FEATURE_BLOCK_BUFFER)
701          && command != I2C_SMBUS_I2C_BLOCK_DATA
702          && i801_set_block_buffer_mode(priv) == 0)
703                 result = i801_block_transaction_by_block(priv, data,
704                                                          read_write, hwpec);
705         else
706                 result = i801_block_transaction_byte_by_byte(priv, data,
707                                                              read_write,
708                                                              command, hwpec);
709
710         if (command == I2C_SMBUS_I2C_BLOCK_DATA
711          && read_write == I2C_SMBUS_WRITE) {
712                 /* restore saved configuration register value */
713                 pci_write_config_byte(priv->pci_dev, SMBHSTCFG, hostc);
714         }
715         return result;
716 }
717
718 /* Return negative errno on error. */
719 static s32 i801_access(struct i2c_adapter *adap, u16 addr,
720                        unsigned short flags, char read_write, u8 command,
721                        int size, union i2c_smbus_data *data)
722 {
723         int hwpec;
724         int block = 0;
725         int ret = 0, xact = 0;
726         struct i801_priv *priv = i2c_get_adapdata(adap);
727
728         mutex_lock(&priv->acpi_lock);
729         if (priv->acpi_reserved) {
730                 mutex_unlock(&priv->acpi_lock);
731                 return -EBUSY;
732         }
733
734         pm_runtime_get_sync(&priv->pci_dev->dev);
735
736         hwpec = (priv->features & FEATURE_SMBUS_PEC) && (flags & I2C_CLIENT_PEC)
737                 && size != I2C_SMBUS_QUICK
738                 && size != I2C_SMBUS_I2C_BLOCK_DATA;
739
740         switch (size) {
741         case I2C_SMBUS_QUICK:
742                 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
743                        SMBHSTADD(priv));
744                 xact = I801_QUICK;
745                 break;
746         case I2C_SMBUS_BYTE:
747                 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
748                        SMBHSTADD(priv));
749                 if (read_write == I2C_SMBUS_WRITE)
750                         outb_p(command, SMBHSTCMD(priv));
751                 xact = I801_BYTE;
752                 break;
753         case I2C_SMBUS_BYTE_DATA:
754                 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
755                        SMBHSTADD(priv));
756                 outb_p(command, SMBHSTCMD(priv));
757                 if (read_write == I2C_SMBUS_WRITE)
758                         outb_p(data->byte, SMBHSTDAT0(priv));
759                 xact = I801_BYTE_DATA;
760                 break;
761         case I2C_SMBUS_WORD_DATA:
762                 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
763                        SMBHSTADD(priv));
764                 outb_p(command, SMBHSTCMD(priv));
765                 if (read_write == I2C_SMBUS_WRITE) {
766                         outb_p(data->word & 0xff, SMBHSTDAT0(priv));
767                         outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1(priv));
768                 }
769                 xact = I801_WORD_DATA;
770                 break;
771         case I2C_SMBUS_BLOCK_DATA:
772                 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
773                        SMBHSTADD(priv));
774                 outb_p(command, SMBHSTCMD(priv));
775                 block = 1;
776                 break;
777         case I2C_SMBUS_I2C_BLOCK_DATA:
778                 /* NB: page 240 of ICH5 datasheet shows that the R/#W
779                  * bit should be cleared here, even when reading */
780                 outb_p((addr & 0x7f) << 1, SMBHSTADD(priv));
781                 if (read_write == I2C_SMBUS_READ) {
782                         /* NB: page 240 of ICH5 datasheet also shows
783                          * that DATA1 is the cmd field when reading */
784                         outb_p(command, SMBHSTDAT1(priv));
785                 } else
786                         outb_p(command, SMBHSTCMD(priv));
787                 block = 1;
788                 break;
789         default:
790                 dev_err(&priv->pci_dev->dev, "Unsupported transaction %d\n",
791                         size);
792                 ret = -EOPNOTSUPP;
793                 goto out;
794         }
795
796         if (hwpec)      /* enable/disable hardware PEC */
797                 outb_p(inb_p(SMBAUXCTL(priv)) | SMBAUXCTL_CRC, SMBAUXCTL(priv));
798         else
799                 outb_p(inb_p(SMBAUXCTL(priv)) & (~SMBAUXCTL_CRC),
800                        SMBAUXCTL(priv));
801
802         if (block)
803                 ret = i801_block_transaction(priv, data, read_write, size,
804                                              hwpec);
805         else
806                 ret = i801_transaction(priv, xact);
807
808         /* Some BIOSes don't like it when PEC is enabled at reboot or resume
809            time, so we forcibly disable it after every transaction. Turn off
810            E32B for the same reason. */
811         if (hwpec || block)
812                 outb_p(inb_p(SMBAUXCTL(priv)) &
813                        ~(SMBAUXCTL_CRC | SMBAUXCTL_E32B), SMBAUXCTL(priv));
814
815         if (block)
816                 goto out;
817         if (ret)
818                 goto out;
819         if ((read_write == I2C_SMBUS_WRITE) || (xact == I801_QUICK))
820                 goto out;
821
822         switch (xact & 0x7f) {
823         case I801_BYTE: /* Result put in SMBHSTDAT0 */
824         case I801_BYTE_DATA:
825                 data->byte = inb_p(SMBHSTDAT0(priv));
826                 break;
827         case I801_WORD_DATA:
828                 data->word = inb_p(SMBHSTDAT0(priv)) +
829                              (inb_p(SMBHSTDAT1(priv)) << 8);
830                 break;
831         }
832
833 out:
834         pm_runtime_mark_last_busy(&priv->pci_dev->dev);
835         pm_runtime_put_autosuspend(&priv->pci_dev->dev);
836         mutex_unlock(&priv->acpi_lock);
837         return ret;
838 }
839
840
841 static u32 i801_func(struct i2c_adapter *adapter)
842 {
843         struct i801_priv *priv = i2c_get_adapdata(adapter);
844
845         return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
846                I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
847                I2C_FUNC_SMBUS_BLOCK_DATA | I2C_FUNC_SMBUS_WRITE_I2C_BLOCK |
848                ((priv->features & FEATURE_SMBUS_PEC) ? I2C_FUNC_SMBUS_PEC : 0) |
849                ((priv->features & FEATURE_I2C_BLOCK_READ) ?
850                 I2C_FUNC_SMBUS_READ_I2C_BLOCK : 0);
851 }
852
853 static const struct i2c_algorithm smbus_algorithm = {
854         .smbus_xfer     = i801_access,
855         .functionality  = i801_func,
856 };
857
858 static const struct pci_device_id i801_ids[] = {
859         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801AA_3) },
860         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801AB_3) },
861         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801BA_2) },
862         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_3) },
863         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_3) },
864         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_3) },
865         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB_4) },
866         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_16) },
867         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_17) },
868         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB2_17) },
869         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH8_5) },
870         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH9_6) },
871         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_EP80579_1) },
872         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH10_4) },
873         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH10_5) },
874         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_5_3400_SERIES_SMBUS) },
875         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_COUGARPOINT_SMBUS) },
876         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS) },
877         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF0) },
878         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF1) },
879         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF2) },
880         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_DH89XXCC_SMBUS) },
881         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_PANTHERPOINT_SMBUS) },
882         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_LYNXPOINT_SMBUS) },
883         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_LYNXPOINT_LP_SMBUS) },
884         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_AVOTON_SMBUS) },
885         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS) },
886         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS0) },
887         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS1) },
888         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS2) },
889         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_COLETOCREEK_SMBUS) },
890         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_WILDCATPOINT_SMBUS) },
891         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_WILDCATPOINT_LP_SMBUS) },
892         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_BAYTRAIL_SMBUS) },
893         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_BRASWELL_SMBUS) },
894         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_SUNRISEPOINT_H_SMBUS) },
895         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_SUNRISEPOINT_LP_SMBUS) },
896         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_DNV_SMBUS) },
897         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_BROXTON_SMBUS) },
898         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_LEWISBURG_SMBUS) },
899         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_LEWISBURG_SSKU_SMBUS) },
900         { 0, }
901 };
902
903 MODULE_DEVICE_TABLE(pci, i801_ids);
904
905 #if defined CONFIG_X86 && defined CONFIG_DMI
906 static unsigned char apanel_addr;
907
908 /* Scan the system ROM for the signature "FJKEYINF" */
909 static __init const void __iomem *bios_signature(const void __iomem *bios)
910 {
911         ssize_t offset;
912         const unsigned char signature[] = "FJKEYINF";
913
914         for (offset = 0; offset < 0x10000; offset += 0x10) {
915                 if (check_signature(bios + offset, signature,
916                                     sizeof(signature)-1))
917                         return bios + offset;
918         }
919         return NULL;
920 }
921
922 static void __init input_apanel_init(void)
923 {
924         void __iomem *bios;
925         const void __iomem *p;
926
927         bios = ioremap(0xF0000, 0x10000); /* Can't fail */
928         p = bios_signature(bios);
929         if (p) {
930                 /* just use the first address */
931                 apanel_addr = readb(p + 8 + 3) >> 1;
932         }
933         iounmap(bios);
934 }
935
936 struct dmi_onboard_device_info {
937         const char *name;
938         u8 type;
939         unsigned short i2c_addr;
940         const char *i2c_type;
941 };
942
943 static const struct dmi_onboard_device_info dmi_devices[] = {
944         { "Syleus", DMI_DEV_TYPE_OTHER, 0x73, "fscsyl" },
945         { "Hermes", DMI_DEV_TYPE_OTHER, 0x73, "fscher" },
946         { "Hades",  DMI_DEV_TYPE_OTHER, 0x73, "fschds" },
947 };
948
949 static void dmi_check_onboard_device(u8 type, const char *name,
950                                      struct i2c_adapter *adap)
951 {
952         int i;
953         struct i2c_board_info info;
954
955         for (i = 0; i < ARRAY_SIZE(dmi_devices); i++) {
956                 /* & ~0x80, ignore enabled/disabled bit */
957                 if ((type & ~0x80) != dmi_devices[i].type)
958                         continue;
959                 if (strcasecmp(name, dmi_devices[i].name))
960                         continue;
961
962                 memset(&info, 0, sizeof(struct i2c_board_info));
963                 info.addr = dmi_devices[i].i2c_addr;
964                 strlcpy(info.type, dmi_devices[i].i2c_type, I2C_NAME_SIZE);
965                 i2c_new_device(adap, &info);
966                 break;
967         }
968 }
969
970 /* We use our own function to check for onboard devices instead of
971    dmi_find_device() as some buggy BIOS's have the devices we are interested
972    in marked as disabled */
973 static void dmi_check_onboard_devices(const struct dmi_header *dm, void *adap)
974 {
975         int i, count;
976
977         if (dm->type != 10)
978                 return;
979
980         count = (dm->length - sizeof(struct dmi_header)) / 2;
981         for (i = 0; i < count; i++) {
982                 const u8 *d = (char *)(dm + 1) + (i * 2);
983                 const char *name = ((char *) dm) + dm->length;
984                 u8 type = d[0];
985                 u8 s = d[1];
986
987                 if (!s)
988                         continue;
989                 s--;
990                 while (s > 0 && name[0]) {
991                         name += strlen(name) + 1;
992                         s--;
993                 }
994                 if (name[0] == 0) /* Bogus string reference */
995                         continue;
996
997                 dmi_check_onboard_device(type, name, adap);
998         }
999 }
1000
1001 /* Register optional slaves */
1002 static void i801_probe_optional_slaves(struct i801_priv *priv)
1003 {
1004         /* Only register slaves on main SMBus channel */
1005         if (priv->features & FEATURE_IDF)
1006                 return;
1007
1008         if (apanel_addr) {
1009                 struct i2c_board_info info;
1010
1011                 memset(&info, 0, sizeof(struct i2c_board_info));
1012                 info.addr = apanel_addr;
1013                 strlcpy(info.type, "fujitsu_apanel", I2C_NAME_SIZE);
1014                 i2c_new_device(&priv->adapter, &info);
1015         }
1016
1017         if (dmi_name_in_vendors("FUJITSU"))
1018                 dmi_walk(dmi_check_onboard_devices, &priv->adapter);
1019 }
1020 #else
1021 static void __init input_apanel_init(void) {}
1022 static void i801_probe_optional_slaves(struct i801_priv *priv) {}
1023 #endif  /* CONFIG_X86 && CONFIG_DMI */
1024
1025 #if (defined CONFIG_I2C_MUX_GPIO || defined CONFIG_I2C_MUX_GPIO_MODULE) && \
1026                 defined CONFIG_DMI
1027 static struct i801_mux_config i801_mux_config_asus_z8_d12 = {
1028         .gpio_chip = "gpio_ich",
1029         .values = { 0x02, 0x03 },
1030         .n_values = 2,
1031         .classes = { I2C_CLASS_SPD, I2C_CLASS_SPD },
1032         .gpios = { 52, 53 },
1033         .n_gpios = 2,
1034 };
1035
1036 static struct i801_mux_config i801_mux_config_asus_z8_d18 = {
1037         .gpio_chip = "gpio_ich",
1038         .values = { 0x02, 0x03, 0x01 },
1039         .n_values = 3,
1040         .classes = { I2C_CLASS_SPD, I2C_CLASS_SPD, I2C_CLASS_SPD },
1041         .gpios = { 52, 53 },
1042         .n_gpios = 2,
1043 };
1044
1045 static const struct dmi_system_id mux_dmi_table[] = {
1046         {
1047                 .matches = {
1048                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1049                         DMI_MATCH(DMI_BOARD_NAME, "Z8NA-D6(C)"),
1050                 },
1051                 .driver_data = &i801_mux_config_asus_z8_d12,
1052         },
1053         {
1054                 .matches = {
1055                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1056                         DMI_MATCH(DMI_BOARD_NAME, "Z8P(N)E-D12(X)"),
1057                 },
1058                 .driver_data = &i801_mux_config_asus_z8_d12,
1059         },
1060         {
1061                 .matches = {
1062                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1063                         DMI_MATCH(DMI_BOARD_NAME, "Z8NH-D12"),
1064                 },
1065                 .driver_data = &i801_mux_config_asus_z8_d12,
1066         },
1067         {
1068                 .matches = {
1069                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1070                         DMI_MATCH(DMI_BOARD_NAME, "Z8PH-D12/IFB"),
1071                 },
1072                 .driver_data = &i801_mux_config_asus_z8_d12,
1073         },
1074         {
1075                 .matches = {
1076                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1077                         DMI_MATCH(DMI_BOARD_NAME, "Z8NR-D12"),
1078                 },
1079                 .driver_data = &i801_mux_config_asus_z8_d12,
1080         },
1081         {
1082                 .matches = {
1083                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1084                         DMI_MATCH(DMI_BOARD_NAME, "Z8P(N)H-D12"),
1085                 },
1086                 .driver_data = &i801_mux_config_asus_z8_d12,
1087         },
1088         {
1089                 .matches = {
1090                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1091                         DMI_MATCH(DMI_BOARD_NAME, "Z8PG-D18"),
1092                 },
1093                 .driver_data = &i801_mux_config_asus_z8_d18,
1094         },
1095         {
1096                 .matches = {
1097                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1098                         DMI_MATCH(DMI_BOARD_NAME, "Z8PE-D18"),
1099                 },
1100                 .driver_data = &i801_mux_config_asus_z8_d18,
1101         },
1102         {
1103                 .matches = {
1104                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1105                         DMI_MATCH(DMI_BOARD_NAME, "Z8PS-D12"),
1106                 },
1107                 .driver_data = &i801_mux_config_asus_z8_d12,
1108         },
1109         { }
1110 };
1111
1112 /* Setup multiplexing if needed */
1113 static int i801_add_mux(struct i801_priv *priv)
1114 {
1115         struct device *dev = &priv->adapter.dev;
1116         const struct i801_mux_config *mux_config;
1117         struct i2c_mux_gpio_platform_data gpio_data;
1118         int err;
1119
1120         if (!priv->mux_drvdata)
1121                 return 0;
1122         mux_config = priv->mux_drvdata;
1123
1124         /* Prepare the platform data */
1125         memset(&gpio_data, 0, sizeof(struct i2c_mux_gpio_platform_data));
1126         gpio_data.parent = priv->adapter.nr;
1127         gpio_data.values = mux_config->values;
1128         gpio_data.n_values = mux_config->n_values;
1129         gpio_data.classes = mux_config->classes;
1130         gpio_data.gpio_chip = mux_config->gpio_chip;
1131         gpio_data.gpios = mux_config->gpios;
1132         gpio_data.n_gpios = mux_config->n_gpios;
1133         gpio_data.idle = I2C_MUX_GPIO_NO_IDLE;
1134
1135         /* Register the mux device */
1136         priv->mux_pdev = platform_device_register_data(dev, "i2c-mux-gpio",
1137                                 PLATFORM_DEVID_AUTO, &gpio_data,
1138                                 sizeof(struct i2c_mux_gpio_platform_data));
1139         if (IS_ERR(priv->mux_pdev)) {
1140                 err = PTR_ERR(priv->mux_pdev);
1141                 priv->mux_pdev = NULL;
1142                 dev_err(dev, "Failed to register i2c-mux-gpio device\n");
1143                 return err;
1144         }
1145
1146         return 0;
1147 }
1148
1149 static void i801_del_mux(struct i801_priv *priv)
1150 {
1151         if (priv->mux_pdev)
1152                 platform_device_unregister(priv->mux_pdev);
1153 }
1154
1155 static unsigned int i801_get_adapter_class(struct i801_priv *priv)
1156 {
1157         const struct dmi_system_id *id;
1158         const struct i801_mux_config *mux_config;
1159         unsigned int class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
1160         int i;
1161
1162         id = dmi_first_match(mux_dmi_table);
1163         if (id) {
1164                 /* Remove branch classes from trunk */
1165                 mux_config = id->driver_data;
1166                 for (i = 0; i < mux_config->n_values; i++)
1167                         class &= ~mux_config->classes[i];
1168
1169                 /* Remember for later */
1170                 priv->mux_drvdata = mux_config;
1171         }
1172
1173         return class;
1174 }
1175 #else
1176 static inline int i801_add_mux(struct i801_priv *priv) { return 0; }
1177 static inline void i801_del_mux(struct i801_priv *priv) { }
1178
1179 static inline unsigned int i801_get_adapter_class(struct i801_priv *priv)
1180 {
1181         return I2C_CLASS_HWMON | I2C_CLASS_SPD;
1182 }
1183 #endif
1184
1185 static const struct itco_wdt_platform_data tco_platform_data = {
1186         .name = "Intel PCH",
1187         .version = 4,
1188 };
1189
1190 static DEFINE_SPINLOCK(p2sb_spinlock);
1191
1192 static void i801_add_tco(struct i801_priv *priv)
1193 {
1194         struct pci_dev *pci_dev = priv->pci_dev;
1195         struct resource tco_res[3], *res;
1196         struct platform_device *pdev;
1197         unsigned int devfn;
1198         u32 tco_base, tco_ctl;
1199         u32 base_addr, ctrl_val;
1200         u64 base64_addr;
1201
1202         if (!(priv->features & FEATURE_TCO))
1203                 return;
1204
1205         pci_read_config_dword(pci_dev, TCOBASE, &tco_base);
1206         pci_read_config_dword(pci_dev, TCOCTL, &tco_ctl);
1207         if (!(tco_ctl & TCOCTL_EN))
1208                 return;
1209
1210         memset(tco_res, 0, sizeof(tco_res));
1211
1212         res = &tco_res[ICH_RES_IO_TCO];
1213         res->start = tco_base & ~1;
1214         res->end = res->start + 32 - 1;
1215         res->flags = IORESOURCE_IO;
1216
1217         /*
1218          * Power Management registers.
1219          */
1220         devfn = PCI_DEVFN(PCI_SLOT(pci_dev->devfn), 2);
1221         pci_bus_read_config_dword(pci_dev->bus, devfn, ACPIBASE, &base_addr);
1222
1223         res = &tco_res[ICH_RES_IO_SMI];
1224         res->start = (base_addr & ~1) + ACPIBASE_SMI_OFF;
1225         res->end = res->start + 3;
1226         res->flags = IORESOURCE_IO;
1227
1228         /*
1229          * Enable the ACPI I/O space.
1230          */
1231         pci_bus_read_config_dword(pci_dev->bus, devfn, ACPICTRL, &ctrl_val);
1232         ctrl_val |= ACPICTRL_EN;
1233         pci_bus_write_config_dword(pci_dev->bus, devfn, ACPICTRL, ctrl_val);
1234
1235         /*
1236          * We must access the NO_REBOOT bit over the Primary to Sideband
1237          * bridge (P2SB). The BIOS prevents the P2SB device from being
1238          * enumerated by the PCI subsystem, so we need to unhide/hide it
1239          * to lookup the P2SB BAR.
1240          */
1241         spin_lock(&p2sb_spinlock);
1242
1243         devfn = PCI_DEVFN(PCI_SLOT(pci_dev->devfn), 1);
1244
1245         /* Unhide the P2SB device */
1246         pci_bus_write_config_byte(pci_dev->bus, devfn, 0xe1, 0x0);
1247
1248         pci_bus_read_config_dword(pci_dev->bus, devfn, SBREG_BAR, &base_addr);
1249         base64_addr = base_addr & 0xfffffff0;
1250
1251         pci_bus_read_config_dword(pci_dev->bus, devfn, SBREG_BAR + 0x4, &base_addr);
1252         base64_addr |= (u64)base_addr << 32;
1253
1254         /* Hide the P2SB device */
1255         pci_bus_write_config_byte(pci_dev->bus, devfn, 0xe1, 0x1);
1256         spin_unlock(&p2sb_spinlock);
1257
1258         res = &tco_res[ICH_RES_MEM_OFF];
1259         res->start = (resource_size_t)base64_addr + SBREG_SMBCTRL;
1260         res->end = res->start + 3;
1261         res->flags = IORESOURCE_MEM;
1262
1263         pdev = platform_device_register_resndata(&pci_dev->dev, "iTCO_wdt", -1,
1264                                                  tco_res, 3, &tco_platform_data,
1265                                                  sizeof(tco_platform_data));
1266         if (IS_ERR(pdev)) {
1267                 dev_warn(&pci_dev->dev, "failed to create iTCO device\n");
1268                 return;
1269         }
1270
1271         priv->tco_pdev = pdev;
1272 }
1273
1274 #ifdef CONFIG_ACPI
1275 static acpi_status
1276 i801_acpi_io_handler(u32 function, acpi_physical_address address, u32 bits,
1277                      u64 *value, void *handler_context, void *region_context)
1278 {
1279         struct i801_priv *priv = handler_context;
1280         struct pci_dev *pdev = priv->pci_dev;
1281         acpi_status status;
1282
1283         /*
1284          * Once BIOS AML code touches the OpRegion we warn and inhibit any
1285          * further access from the driver itself. This device is now owned
1286          * by the system firmware.
1287          */
1288         mutex_lock(&priv->acpi_lock);
1289
1290         if (!priv->acpi_reserved) {
1291                 priv->acpi_reserved = true;
1292
1293                 dev_warn(&pdev->dev, "BIOS is accessing SMBus registers\n");
1294                 dev_warn(&pdev->dev, "Driver SMBus register access inhibited\n");
1295
1296                 /*
1297                  * BIOS is accessing the host controller so prevent it from
1298                  * suspending automatically from now on.
1299                  */
1300                 pm_runtime_get_sync(&pdev->dev);
1301         }
1302
1303         if ((function & ACPI_IO_MASK) == ACPI_READ)
1304                 status = acpi_os_read_port(address, (u32 *)value, bits);
1305         else
1306                 status = acpi_os_write_port(address, (u32)*value, bits);
1307
1308         mutex_unlock(&priv->acpi_lock);
1309
1310         return status;
1311 }
1312
1313 static int i801_acpi_probe(struct i801_priv *priv)
1314 {
1315         struct acpi_device *adev;
1316         acpi_status status;
1317
1318         adev = ACPI_COMPANION(&priv->pci_dev->dev);
1319         if (adev) {
1320                 status = acpi_install_address_space_handler(adev->handle,
1321                                 ACPI_ADR_SPACE_SYSTEM_IO, i801_acpi_io_handler,
1322                                 NULL, priv);
1323                 if (ACPI_SUCCESS(status))
1324                         return 0;
1325         }
1326
1327         return acpi_check_resource_conflict(&priv->pci_dev->resource[SMBBAR]);
1328 }
1329
1330 static void i801_acpi_remove(struct i801_priv *priv)
1331 {
1332         struct acpi_device *adev;
1333
1334         adev = ACPI_COMPANION(&priv->pci_dev->dev);
1335         if (!adev)
1336                 return;
1337
1338         acpi_remove_address_space_handler(adev->handle,
1339                 ACPI_ADR_SPACE_SYSTEM_IO, i801_acpi_io_handler);
1340
1341         mutex_lock(&priv->acpi_lock);
1342         if (priv->acpi_reserved)
1343                 pm_runtime_put(&priv->pci_dev->dev);
1344         mutex_unlock(&priv->acpi_lock);
1345 }
1346 #else
1347 static inline int i801_acpi_probe(struct i801_priv *priv) { return 0; }
1348 static inline void i801_acpi_remove(struct i801_priv *priv) { }
1349 #endif
1350
1351 static int i801_probe(struct pci_dev *dev, const struct pci_device_id *id)
1352 {
1353         unsigned char temp;
1354         int err, i;
1355         struct i801_priv *priv;
1356
1357         priv = devm_kzalloc(&dev->dev, sizeof(*priv), GFP_KERNEL);
1358         if (!priv)
1359                 return -ENOMEM;
1360
1361         i2c_set_adapdata(&priv->adapter, priv);
1362         priv->adapter.owner = THIS_MODULE;
1363         priv->adapter.class = i801_get_adapter_class(priv);
1364         priv->adapter.algo = &smbus_algorithm;
1365         priv->adapter.dev.parent = &dev->dev;
1366         ACPI_COMPANION_SET(&priv->adapter.dev, ACPI_COMPANION(&dev->dev));
1367         priv->adapter.retries = 3;
1368         mutex_init(&priv->acpi_lock);
1369
1370         priv->pci_dev = dev;
1371         switch (dev->device) {
1372         case PCI_DEVICE_ID_INTEL_SUNRISEPOINT_H_SMBUS:
1373         case PCI_DEVICE_ID_INTEL_SUNRISEPOINT_LP_SMBUS:
1374         case PCI_DEVICE_ID_INTEL_LEWISBURG_SMBUS:
1375         case PCI_DEVICE_ID_INTEL_LEWISBURG_SSKU_SMBUS:
1376         case PCI_DEVICE_ID_INTEL_DNV_SMBUS:
1377                 priv->features |= FEATURE_I2C_BLOCK_READ;
1378                 priv->features |= FEATURE_IRQ;
1379                 priv->features |= FEATURE_SMBUS_PEC;
1380                 priv->features |= FEATURE_BLOCK_BUFFER;
1381                 priv->features |= FEATURE_TCO;
1382                 break;
1383
1384         case PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF0:
1385         case PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF1:
1386         case PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF2:
1387         case PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS0:
1388         case PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS1:
1389         case PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS2:
1390                 priv->features |= FEATURE_IDF;
1391                 /* fall through */
1392         default:
1393                 priv->features |= FEATURE_I2C_BLOCK_READ;
1394                 priv->features |= FEATURE_IRQ;
1395                 /* fall through */
1396         case PCI_DEVICE_ID_INTEL_82801DB_3:
1397                 priv->features |= FEATURE_SMBUS_PEC;
1398                 priv->features |= FEATURE_BLOCK_BUFFER;
1399                 /* fall through */
1400         case PCI_DEVICE_ID_INTEL_82801CA_3:
1401         case PCI_DEVICE_ID_INTEL_82801BA_2:
1402         case PCI_DEVICE_ID_INTEL_82801AB_3:
1403         case PCI_DEVICE_ID_INTEL_82801AA_3:
1404                 break;
1405         }
1406
1407         /* Disable features on user request */
1408         for (i = 0; i < ARRAY_SIZE(i801_feature_names); i++) {
1409                 if (priv->features & disable_features & (1 << i))
1410                         dev_notice(&dev->dev, "%s disabled by user\n",
1411                                    i801_feature_names[i]);
1412         }
1413         priv->features &= ~disable_features;
1414
1415         err = pcim_enable_device(dev);
1416         if (err) {
1417                 dev_err(&dev->dev, "Failed to enable SMBus PCI device (%d)\n",
1418                         err);
1419                 return err;
1420         }
1421         pcim_pin_device(dev);
1422
1423         /* Determine the address of the SMBus area */
1424         priv->smba = pci_resource_start(dev, SMBBAR);
1425         if (!priv->smba) {
1426                 dev_err(&dev->dev,
1427                         "SMBus base address uninitialized, upgrade BIOS\n");
1428                 return -ENODEV;
1429         }
1430
1431         if (i801_acpi_probe(priv))
1432                 return -ENODEV;
1433
1434         err = pcim_iomap_regions(dev, 1 << SMBBAR,
1435                                  dev_driver_string(&dev->dev));
1436         if (err) {
1437                 dev_err(&dev->dev,
1438                         "Failed to request SMBus region 0x%lx-0x%Lx\n",
1439                         priv->smba,
1440                         (unsigned long long)pci_resource_end(dev, SMBBAR));
1441                 i801_acpi_remove(priv);
1442                 return err;
1443         }
1444
1445         pci_read_config_byte(priv->pci_dev, SMBHSTCFG, &temp);
1446         priv->original_hstcfg = temp;
1447         temp &= ~SMBHSTCFG_I2C_EN;      /* SMBus timing */
1448         if (!(temp & SMBHSTCFG_HST_EN)) {
1449                 dev_info(&dev->dev, "Enabling SMBus device\n");
1450                 temp |= SMBHSTCFG_HST_EN;
1451         }
1452         pci_write_config_byte(priv->pci_dev, SMBHSTCFG, temp);
1453
1454         if (temp & SMBHSTCFG_SMB_SMI_EN) {
1455                 dev_dbg(&dev->dev, "SMBus using interrupt SMI#\n");
1456                 /* Disable SMBus interrupt feature if SMBus using SMI# */
1457                 priv->features &= ~FEATURE_IRQ;
1458         }
1459
1460         /* Clear special mode bits */
1461         if (priv->features & (FEATURE_SMBUS_PEC | FEATURE_BLOCK_BUFFER))
1462                 outb_p(inb_p(SMBAUXCTL(priv)) &
1463                        ~(SMBAUXCTL_CRC | SMBAUXCTL_E32B), SMBAUXCTL(priv));
1464
1465         /* Default timeout in interrupt mode: 200 ms */
1466         priv->adapter.timeout = HZ / 5;
1467
1468         if (priv->features & FEATURE_IRQ) {
1469                 u16 pcictl, pcists;
1470
1471                 /* Complain if an interrupt is already pending */
1472                 pci_read_config_word(priv->pci_dev, SMBPCISTS, &pcists);
1473                 if (pcists & SMBPCISTS_INTS)
1474                         dev_warn(&dev->dev, "An interrupt is pending!\n");
1475
1476                 /* Check if interrupts have been disabled */
1477                 pci_read_config_word(priv->pci_dev, SMBPCICTL, &pcictl);
1478                 if (pcictl & SMBPCICTL_INTDIS) {
1479                         dev_info(&dev->dev, "Interrupts are disabled\n");
1480                         priv->features &= ~FEATURE_IRQ;
1481                 }
1482         }
1483
1484         if (priv->features & FEATURE_IRQ) {
1485                 init_waitqueue_head(&priv->waitq);
1486
1487                 err = devm_request_irq(&dev->dev, dev->irq, i801_isr,
1488                                        IRQF_SHARED,
1489                                        dev_driver_string(&dev->dev), priv);
1490                 if (err) {
1491                         dev_err(&dev->dev, "Failed to allocate irq %d: %d\n",
1492                                 dev->irq, err);
1493                         priv->features &= ~FEATURE_IRQ;
1494                 }
1495         }
1496         dev_info(&dev->dev, "SMBus using %s\n",
1497                  priv->features & FEATURE_IRQ ? "PCI interrupt" : "polling");
1498
1499         i801_add_tco(priv);
1500
1501         snprintf(priv->adapter.name, sizeof(priv->adapter.name),
1502                 "SMBus I801 adapter at %04lx", priv->smba);
1503         err = i2c_add_adapter(&priv->adapter);
1504         if (err) {
1505                 dev_err(&dev->dev, "Failed to add SMBus adapter\n");
1506                 i801_acpi_remove(priv);
1507                 return err;
1508         }
1509
1510         i801_probe_optional_slaves(priv);
1511         /* We ignore errors - multiplexing is optional */
1512         i801_add_mux(priv);
1513
1514         pci_set_drvdata(dev, priv);
1515
1516         pm_runtime_set_autosuspend_delay(&dev->dev, 1000);
1517         pm_runtime_use_autosuspend(&dev->dev);
1518         pm_runtime_put_autosuspend(&dev->dev);
1519         pm_runtime_allow(&dev->dev);
1520
1521         return 0;
1522 }
1523
1524 static void i801_remove(struct pci_dev *dev)
1525 {
1526         struct i801_priv *priv = pci_get_drvdata(dev);
1527
1528         pm_runtime_forbid(&dev->dev);
1529         pm_runtime_get_noresume(&dev->dev);
1530
1531         i801_del_mux(priv);
1532         i2c_del_adapter(&priv->adapter);
1533         i801_acpi_remove(priv);
1534         pci_write_config_byte(dev, SMBHSTCFG, priv->original_hstcfg);
1535
1536         platform_device_unregister(priv->tco_pdev);
1537
1538         /*
1539          * do not call pci_disable_device(dev) since it can cause hard hangs on
1540          * some systems during power-off (eg. Fujitsu-Siemens Lifebook E8010)
1541          */
1542 }
1543
1544 #ifdef CONFIG_PM
1545 static int i801_suspend(struct device *dev)
1546 {
1547         struct pci_dev *pci_dev = to_pci_dev(dev);
1548         struct i801_priv *priv = pci_get_drvdata(pci_dev);
1549
1550         pci_write_config_byte(pci_dev, SMBHSTCFG, priv->original_hstcfg);
1551         return 0;
1552 }
1553
1554 static int i801_resume(struct device *dev)
1555 {
1556         return 0;
1557 }
1558 #endif
1559
1560 static UNIVERSAL_DEV_PM_OPS(i801_pm_ops, i801_suspend,
1561                             i801_resume, NULL);
1562
1563 static struct pci_driver i801_driver = {
1564         .name           = "i801_smbus",
1565         .id_table       = i801_ids,
1566         .probe          = i801_probe,
1567         .remove         = i801_remove,
1568         .driver         = {
1569                 .pm     = &i801_pm_ops,
1570         },
1571 };
1572
1573 static int __init i2c_i801_init(void)
1574 {
1575         if (dmi_name_in_vendors("FUJITSU"))
1576                 input_apanel_init();
1577         return pci_register_driver(&i801_driver);
1578 }
1579
1580 static void __exit i2c_i801_exit(void)
1581 {
1582         pci_unregister_driver(&i801_driver);
1583 }
1584
1585 MODULE_AUTHOR("Mark D. Studebaker <mdsxyz123@yahoo.com>, Jean Delvare <jdelvare@suse.de>");
1586 MODULE_DESCRIPTION("I801 SMBus driver");
1587 MODULE_LICENSE("GPL");
1588
1589 module_init(i2c_i801_init);
1590 module_exit(i2c_i801_exit);