2 * Copyright (c) 2014 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com> and was subsequently ported
6 * to FreeBSD by Michael Gmelin <freebsd@grem.de>
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
18 * 3. Neither the name of The DragonFly Project nor the names of its
19 * contributors may be used to endorse or promote products derived
20 * from this software without specific, prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
26 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
28 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
29 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
30 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
31 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
32 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * Intel fourth generation mobile cpus integrated I2C device.
40 * Datasheet reference: Section 22.
42 * http://www.intel.com/content/www/us/en/processors/core/4th-gen-core-family-mobile-i-o-datasheet.html?wapkw=datasheets+4th+generation
44 * This is a from-scratch driver under the BSD license using the Intel data
45 * sheet and the linux driver for reference. All code is freshly written
46 * without referencing the linux driver code. However, during testing
47 * I am also using the linux driver code as a reference to help resolve any
48 * issues that come. These will be specifically documented in the code.
50 * This controller is an I2C master only and cannot act as a slave. The IO
51 * voltage should be set by the BIOS. Standard (100Kb/s) and Fast (400Kb/s)
52 * and fast mode plus (1MB/s) is supported. High speed mode (3.4 MB/s) is NOT
56 #ifndef _ICHIIC_IG4_REG_H_
57 #define _ICHIIC_IG4_REG_H_
60 * 22.2 MMIO registers can be accessed through BAR0 in PCI mode or through
61 * BAR1 when in ACPI mode.
63 * Register width is 32-bits
65 * 22.2 Default Values on device reset are 0 except as specified here:
67 * SS_SCL_HCNT 0x00000264
68 * SS_SCL_LCNT 0x000002C2
69 * FS_SCL_HCNT 0x0000006E
70 * FS_SCL_LCNT 0x000000CF
71 * INTR_MASK 0x000008FF
74 * SDA_SETUP 0x00000064
75 * COMP_PARAM1 0x00FFFF6E
78 #define IG4_REG_CTL 0x0000 /* RW Control Register */
79 #define IG4_REG_TAR_ADD 0x0004 /* RW Target Address */
80 #define IG4_REG_HS_MADDR 0x000C /* RW High Speed Master Mode Code Address*/
81 #define IG4_REG_DATA_CMD 0x0010 /* RW Data Buffer and Command */
82 #define IG4_REG_SS_SCL_HCNT 0x0014 /* RW Std Speed clock High Count */
83 #define IG4_REG_SS_SCL_LCNT 0x0018 /* RW Std Speed clock Low Count */
84 #define IG4_REG_FS_SCL_HCNT 0x001C /* RW Fast Speed clock High Count */
85 #define IG4_REG_FS_SCL_LCNT 0x0020 /* RW Fast Speed clock Low Count */
86 #define IG4_REG_INTR_STAT 0x002C /* RO Interrupt Status */
87 #define IG4_REG_INTR_MASK 0x0030 /* RW Interrupt Mask */
88 #define IG4_REG_RAW_INTR_STAT 0x0034 /* RO Raw Interrupt Status */
89 #define IG4_REG_RX_TL 0x0038 /* RW Receive FIFO Threshold */
90 #define IG4_REG_TX_TL 0x003C /* RW Transmit FIFO Threshold */
91 #define IG4_REG_CLR_INTR 0x0040 /* RO Clear Interrupt */
92 #define IG4_REG_CLR_RX_UNDER 0x0044 /* RO Clear RX_Under Interrupt */
93 #define IG4_REG_CLR_RX_OVER 0x0048 /* RO Clear RX_Over Interrupt */
94 #define IG4_REG_CLR_TX_OVER 0x004C /* RO Clear TX_Over Interrupt */
95 #define IG4_REG_CLR_RD_REQ 0x0050 /* RO Clear RD_Req Interrupt */
96 #define IG4_REG_CLR_TX_ABORT 0x0054 /* RO Clear TX_Abort Interrupt */
97 #define IG4_REG_CLR_RX_DONE 0x0058 /* RO Clear RX_Done Interrupt */
98 #define IG4_REG_CLR_ACTIVITY 0x005C /* RO Clear Activity Interrupt */
99 #define IG4_REG_CLR_STOP_DET 0x0060 /* RO Clear STOP Detection Int */
100 #define IG4_REG_CLR_START_DET 0x0064 /* RO Clear START Detection Int */
101 #define IG4_REG_CLR_GEN_CALL 0x0068 /* RO Clear General Call Interrupt */
102 #define IG4_REG_I2C_EN 0x006C /* RW I2C Enable */
103 #define IG4_REG_I2C_STA 0x0070 /* RO I2C Status */
104 #define IG4_REG_TXFLR 0x0074 /* RO Transmit FIFO Level */
105 #define IG4_REG_RXFLR 0x0078 /* RO Receive FIFO Level */
106 #define IG4_REG_SDA_HOLD 0x007C /* RW SDA Hold Time Length */
107 #define IG4_REG_TX_ABRT_SOURCE 0x0080 /* RO Transmit Abort Source */
108 #define IG4_REG_SLV_DATA_NACK 0x0084 /* RW General Slave Data NACK */
109 #define IG4_REG_DMA_CTRL 0x0088 /* RW DMA Control */
110 #define IG4_REG_DMA_TDLR 0x008C /* RW DMA Transmit Data Level */
111 #define IG4_REG_DMA_RDLR 0x0090 /* RW DMA Receive Data Level */
112 #define IG4_REG_SDA_SETUP 0x0094 /* RW SDA Setup */
113 #define IG4_REG_ACK_GENERAL_CALL 0x0098 /* RW I2C ACK General Call */
114 #define IG4_REG_ENABLE_STATUS 0x009C /* RO Enable Status */
115 /* Available at least on Atom SoCs, Haswell mobile and some Skylakes. */
116 #define IG4_REG_COMP_PARAM1 0x00F4 /* RO Component Parameter */
117 #define IG4_REG_COMP_VER 0x00F8 /* RO Component Version */
118 /* Available at least on Atom SoCs */
119 #define IG4_REG_COMP_TYPE 0x00FC /* RO Probe width/endian? (linux) */
120 /* 0x200-0x2FF - Additional registers available on Skylake-U/Y and others */
121 #define IG4_REG_RESETS_SKL 0x0204 /* RW Reset Register */
122 #define IG4_REG_ACTIVE_LTR_VALUE 0x0210 /* RW Active LTR Value */
123 #define IG4_REG_IDLE_LTR_VALUE 0x0214 /* RW Idle LTR Value */
124 #define IG4_REG_TX_ACK_COUNT 0x0218 /* RO TX ACK Count */
125 #define IG4_REG_RX_BYTE_COUNT 0x021C /* RO RX ACK Count */
126 #define IG4_REG_DEVIDLE_CTRL 0x024C /* RW Device Control */
127 /* Available at least on Atom SoCs */
128 #define IG4_REG_CLK_PARMS 0x0800 /* RW Clock Parameters */
129 /* Available at least on Atom SoCs and Haswell mobile */
130 #define IG4_REG_RESETS_HSW 0x0804 /* RW Reset Register */
131 #define IG4_REG_GENERAL 0x0808 /* RW General Register */
132 /* These LTR config registers are at least available on Haswell mobile. */
133 #define IG4_REG_SW_LTR_VALUE 0x0810 /* RW SW LTR Value */
134 #define IG4_REG_AUTO_LTR_VALUE 0x0814 /* RW Auto LTR Value */
137 * CTL - Control Register 22.2.1
138 * Default Value: 0x0000007F.
140 * RESTARTEN - RW Restart Enable
141 * 10BIT - RW Controller operates in 10-bit mode, else 7-bit
143 * NOTE: When restart is disabled the controller is incapable of
144 * performing the following functions:
146 * Sending a START Byte
147 * Performing any high-speed mode op
148 * Performing direction changes in combined format mode
149 * Performing a read operation with a 10-bit address
151 * Attempting to perform the above operations will result in the
152 * TX_ABORT bit being set in RAW_INTR_STAT.
154 #define IG4_CTL_SLAVE_DISABLE 0x0040 /* snarfed from linux */
155 #define IG4_CTL_RESTARTEN 0x0020 /* Allow Restart when master */
156 #define IG4_CTL_10BIT 0x0010 /* ctlr accepts 10-bit addresses */
157 #define IG4_CTL_SPEED_MASK 0x0006 /* speed at which the I2C operates */
158 #define IG4_CTL_MASTER 0x0001 /* snarfed from linux */
160 #define IG4_CTL_SPEED_HIGH 0x0006 /* snarfed from linux */
161 #define IG4_CTL_SPEED_FAST 0x0004 /* snarfed from linux */
162 #define IG4_CTL_SPEED_STD 0x0002 /* snarfed from linux */
165 * TAR_ADD - Target Address Register 22.2.2
166 * Default Value: 0x00000055F
168 * 10BIT - RW controller starts its transfers in 10-bit
169 * address mode, else 7-bit.
171 * SPECIAL - RW Indicates whether software performs a General Call
172 * or START BYTE command.
174 * 0 Ignore GC_OR_START and use TAR address.
176 * 1 Perform special I2C Command based on GC_OR_START.
178 * GC_OR_START - RW (only if SPECIAL is set)
180 * 0 General Call Address. After issuing a General Call,
181 * only writes may be performed. Attempting to issue
182 * a read command results in IX_ABRT in RAW_INTR_STAT.
183 * The controller remains in General Call mode until
184 * bit 11 (SPECIAL) is cleared.
189 * IC_TAR - RW when transmitting a general call, these bits are
190 * ignored. To generate a START BYTE, the address
191 * needs to be written into these bits once.
193 * This register should only be updated when the IIC is disabled (I2C_ENABLE=0)
195 #define IG4_TAR_10BIT 0x1000 /* start xfer in 10-bit mode */
196 #define IG4_TAR_SPECIAL 0x0800 /* Perform special command */
197 #define IG4_TAR_GC_OR_START 0x0400 /* General Call or Start */
198 #define IG4_TAR_ADDR_MASK 0x03FF /* Target address */
201 * TAR_DATA_CMD - Data Buffer and Command Register 22.2.3
203 * RESTART - RW This bit controls whether a forced RESTART is
204 * issued before the byte is sent or received.
206 * 0 If not set a RESTART is only issued if the transfer
207 * direction is changing from the previous command.
209 * 1 A RESTART is issued before the byte is sent or
210 * received, regardless of whether or not the transfer
211 * direction is changing from the previous command.
213 * STOP - RW This bit controls whether a STOP is issued after
214 * the byte is sent or received.
216 * 0 STOP is not issued after this byte, regardless
217 * of whether or not the Tx FIFO is empty.
219 * 1 STOP is issued after this byte, regardless of
220 * whether or not the Tx FIFO is empty. If the
221 * Tx FIFO is not empty the master immediately tries
222 * to start a new transfer by issuing a START and
223 * arbitrating for the bus.
225 * i.e. the STOP is issued along with this byte,
226 * within the write stream.
228 * COMMAND - RW Control whether a read or write is performed.
234 * DATA (7:0) - RW Contains the data to be transmitted or received
237 * NOTE: Writing to this register causes a START + slave + RW to be
238 * issued if the direction has changed or the last data byte was
241 * NOTE: We control termination? so this register must be written
242 * for each byte we wish to receive. We can then drain the
246 #define IG4_DATA_RESTART 0x0400 /* Force RESTART */
247 #define IG4_DATA_STOP 0x0200 /* Force STOP[+START] */
248 #define IG4_DATA_COMMAND_RD 0x0100 /* bus direction 0=write 1=read */
249 #define IG4_DATA_MASK 0x00FF
252 * SS_SCL_HCNT - Standard Speed Clock High Count Register 22.2.4
253 * SS_SCL_LCNT - Standard Speed Clock Low Count Register 22.2.5
254 * FS_SCL_HCNT - Fast Speed Clock High Count Register 22.2.6
255 * FS_SCL_LCNT - Fast Speed Clock Low Count Register 22.2.7
257 * COUNT (15:0) - Set the period count to a value between 6 and
260 #define IG4_SCL_CLOCK_MASK 0xFFFFU /* count bits in register */
263 * INTR_STAT - (RO) Interrupt Status Register 22.2.8
264 * INTR_MASK - (RW) Interrupt Mask Register 22.2.9
265 * RAW_INTR_STAT- (RO) Raw Interrupt Status Register 22.2.10
267 * GEN_CALL Set only when a general call (broadcast) address
268 * is received and acknowleged, stays set until
269 * cleared by reading CLR_GEN_CALL.
271 * START_DET Set when a START or RESTART condition has occurred
274 * STOP_DET Set when a STOP condition has occurred on the
277 * ACTIVITY Set by any activity on the interface. Cleared
278 * by reading CLR_ACTIVITY or CLR_INTR.
280 * TX_ABRT Indicates the controller as a transmitter is
281 * unable to complete the intended action. When set,
282 * the controller will hold the TX FIFO in a reset
283 * state (flushed) until CLR_TX_ABORT is read to
284 * clear the condition. Once cleared, the TX FIFO
285 * will be available again.
287 * TX_EMPTY Indicates that the transmitter is at or below
288 * the specified TX_TL threshold. Automatically
289 * cleared by HW when the buffer level goes above
292 * TX_OVER Indicates that the processor attempted to write
293 * to the TX FIFO while the TX FIFO was full. Cleared
294 * by reading CLR_TX_OVER.
296 * RX_FULL Indicates that the receive FIFO has reached or
297 * exceeded the specified RX_TL threshold. Cleared
298 * by HW when the cpu drains the FIFO to below the
301 * RX_OVER Indicates that the receive FIFO was unable to
302 * accept new data and data was lost. Cleared by
303 * reading CLR_RX_OVER.
305 * RX_UNDER Indicates that the cpu attempted to read data
306 * from the receive buffer while the RX FIFO was
307 * empty. Cleared by reading CLR_RX_UNDER.
309 * NOTES ON RAW_INTR_STAT:
311 * This register can be used to monitor the GEN_CALL, START_DET,
312 * STOP_DET, ACTIVITY, TX_ABRT, TX_EMPTY, TX_OVER, RX_FULL, RX_OVER,
313 * and RX_UNDER bits. The documentation is a bit unclear but presumably
314 * this is the unlatched version.
316 * Code should test FIFO conditions using the I2C_STA (status) register,
317 * not the interrupt status registers.
320 #define IG4_INTR_GEN_CALL 0x0800
321 #define IG4_INTR_START_DET 0x0400
322 #define IG4_INTR_STOP_DET 0x0200
323 #define IG4_INTR_ACTIVITY 0x0100
324 #define IG4_INTR_TX_ABRT 0x0040
325 #define IG4_INTR_TX_EMPTY 0x0010
326 #define IG4_INTR_TX_OVER 0x0008
327 #define IG4_INTR_RX_FULL 0x0004
328 #define IG4_INTR_RX_OVER 0x0002
329 #define IG4_INTR_RX_UNDER 0x0001
331 #define IG4_INTR_ERR_MASK (IG4_INTR_TX_ABRT | IG4_INTR_TX_OVER | \
332 IG4_INTR_RX_OVER | IG4_INTR_RX_UNDER)
335 * RX_TL - (RW) Receive FIFO Threshold Register 22.2.11
336 * TX_TL - (RW) Transmit FIFO Threshold Register 22.2.12
338 * Specify the receive and transmit FIFO threshold register. The
339 * FIFOs have 16 elements. The valid range is 0-15. Setting a
340 * value greater than 15 causes the actual value to be the maximum
343 * Generally speaking since everything is messaged, we can use a
344 * mid-level setting for both parameters and (e.g.) fully drain the
345 * receive FIFO on the STOP_DET condition to handle loose ends.
347 #define IG4_FIFO_MASK 0x00FF
348 #define IG4_FIFO_LIMIT 16
351 * CLR_INTR - (RO) Clear Interrupt Register 22.2.13
352 * CLR_RX_UNDER - (RO) Clear Interrupt Register (specific) 22.2.14
353 * CLR_RX_OVER - (RO) Clear Interrupt Register (specific) 22.2.15
354 * CLR_TX_OVER - (RO) Clear Interrupt Register (specific) 22.2.16
355 * CLR_TX_ABORT - (RO) Clear Interrupt Register (specific) 22.2.17
356 * CLR_ACTIVITY - (RO) Clear Interrupt Register (specific) 22.2.18
357 * CLR_STOP_DET - (RO) Clear Interrupt Register (specific) 22.2.19
358 * CLR_START_DET- (RO) Clear Interrupt Register (specific) 22.2.20
359 * CLR_GEN_CALL - (RO) Clear Interrupt Register (specific) 22.2.21
361 * CLR_* specific operations clear the appropriate bit in the
362 * RAW_INTR_STAT register. Intel does not really document whether
363 * these operations clear the normal interrupt status register.
365 * CLR_INTR clears bits in the normal interrupt status register and
366 * presumably also the raw(?) register? Intel is again unclear.
368 * NOTE: CLR_INTR only clears software-clearable interrupts. Hardware
369 * clearable interrupts are controlled entirely by the hardware.
370 * CLR_INTR also clears the TX_ABRT_SOURCE register.
372 * NOTE: CLR_TX_ABORT also clears the TX_ABRT_SOURCE register and releases
373 * the TX FIFO from its flushed/reset state, allowing more writes
376 * NOTE: CLR_ACTIVITY has no effect if the I2C bus is still active.
377 * Intel documents that the bit is automatically cleared when
378 * there is no further activity on the bus.
380 #define IG4_CLR_BIT 0x0001 /* Reflects source */
383 * I2C_EN - (RW) I2C Enable Register 22.2.22
385 * ABORT Software can abort an I2C transfer by setting this
386 * bit. In response, the controller issues the STOP
387 * condition over the I2C bus, followed by TX FIFO flush.
388 * Hardware will clear the bit once the STOP has
389 * been detected. This bit can only be set while the
390 * I2C interface is enabled.
392 * I2C_ENABLE Enable the controller, else disable it.
393 * (Use I2C_ENABLE_STATUS to poll enable status
394 * & wait for changes)
396 #define IG4_I2C_ABORT 0x0002
397 #define IG4_I2C_ENABLE 0x0001
400 * I2C_STA - (RO) I2C Status Register 22.2.23
402 #define IG4_STATUS_ACTIVITY 0x0020 /* Controller is active */
403 #define IG4_STATUS_RX_FULL 0x0010 /* RX FIFO completely full */
404 #define IG4_STATUS_RX_NOTEMPTY 0x0008 /* RX FIFO not empty */
405 #define IG4_STATUS_TX_EMPTY 0x0004 /* TX FIFO completely empty */
406 #define IG4_STATUS_TX_NOTFULL 0x0002 /* TX FIFO not full */
407 #define IG4_STATUS_I2C_ACTIVE 0x0001 /* I2C bus is active */
410 * TXFLR - (RO) Transmit FIFO Level Register 22.2.24
411 * RXFLR - (RO) Receive FIFO Level Register 22.2.25
413 * Read the number of entries currently in the Transmit or Receive
414 * FIFOs. Note that for some reason the mask is 9 bits instead of
415 * the 8 bits the fill level controls.
417 #define IG4_FIFOLVL_MASK 0x01FF
420 * SDA_HOLD - (RW) SDA Hold Time Length Register 22.2.26
422 * Set the SDA hold time length register in I2C clocks.
424 #define IG4_SDA_TX_HOLD_MASK 0x0000FFFF
427 * TX_ABRT_SOURCE- (RO) Transmit Abort Source Register 22.2.27
429 * Indicates the cause of a transmit abort. This can indicate a
430 * software programming error or a device expected address width
431 * mismatch or other issues. The NORESTART conditions and GENCALL_NOACK
432 * can only occur if a programming error was made in the driver software.
434 * In particular, it should be possible to detect whether any devices
435 * are on the bus by observing the GENCALL_READ status, and it might
436 * be possible to detect ADDR7 vs ADDR10 mismatches.
438 #define IG4_ABRTSRC_TRANSFER 0x00010000 /* Abort initiated by user */
439 #define IG4_ABRTSRC_ARBLOST 0x00001000 /* Arbitration lost */
440 #define IG4_ABRTSRC_NORESTART_10 0x00000400 /* RESTART disabled */
441 #define IG4_ABRTSRC_NORESTART_START 0x00000200 /* RESTART disabled */
442 #define IG4_ABRTSRC_ACKED_START 0x00000080 /* Improper acked START */
443 #define IG4_ABRTSRC_GENCALL_READ 0x00000020 /* Improper GENCALL */
444 #define IG4_ABRTSRC_GENCALL_NOACK 0x00000010 /* Nobody acked GENCALL */
445 #define IG4_ABRTSRC_TXNOACK_DATA 0x00000008 /* data phase no ACK */
446 #define IG4_ABRTSRC_TXNOACK_ADDR10_2 0x00000004 /* addr10/1 phase no ACK */
447 #define IG4_ABRTSRC_TXNOACK_ADDR10_1 0x00000002 /* addr10/2 phase no ACK */
448 #define IG4_ABRTSRC_TXNOACK_ADDR7 0x00000001 /* addr7 phase no ACK */
451 * SLV_DATA_NACK - (RW) Generate Slave DATA NACK Register 22.2.28
453 * When the controller is a receiver a NACK can be generated on
456 * NACK_GENERATE Set to 0 for normal NACK/ACK generation.
457 * Set to 1 to generate a NACK after next data
461 #define IG4_NACK_GENERATE 0x0001
464 * DMA_CTRL - (RW) DMA Control Register 22.2.29
466 * Enables DMA on the transmit and/or receive DMA channel.
468 #define IG4_TX_DMA_ENABLE 0x0002
469 #define IG4_RX_DMA_ENABLE 0x0001
472 * DMA_TDLR - (RW) DMA Transmit Data Level Register 22.2.30
473 * DMA_RDLR - (RW) DMA Receive Data Level Register 22.2.31
475 * Similar to RX_TL and TX_TL but controls when a DMA burst occurs
476 * to empty or fill the FIFOs. Use the same IG4_FIFO_MASK and
477 * IG4_FIFO_LIMIT defines for RX_RL and TX_TL.
482 * SDA_SETUP - (RW) SDA Setup Time Length Register 22.2.32
484 * Set the SDA setup time length register in I2C clocks.
485 * The register must be programmed with a value >=2.
486 * (Defaults to 0x64).
488 #define IG4_SDA_SETUP_MASK 0x00FF
491 * ACK_GEN_CALL - (RW) ACK General Call Register 22.2.33
493 * Control whether the controller responds with a ACK or NACK when
494 * it receives an I2C General Call address.
496 * If set to 0 a NACK is generated and a General Call interrupt is
497 * NOT generated. Otherwise an ACK + interrupt is generated.
499 #define IG4_ACKGC_ACK 0x0001
502 * ENABLE_STATUS - (RO) Enable Status Registger 22.2.34
504 * DATA_LOST - Indicates that a slave receiver operation has
505 * been aborted with at least one data byte received
506 * from a transfer due to the I2C controller being
507 * disabled (IG4_I2C_ENABLE -> 0)
509 * ENABLED - Intel documentation is lacking but I assume this
510 * is a reflection of the IG4_I2C_ENABLE bit in the
514 #define IG4_ENASTAT_DATA_LOST 0x0004
515 #define IG4_ENASTAT_ENABLED 0x0001
518 * COMP_PARAM1 - (RO) Component Parameter Register 22.2.35
519 * Default Value 0x00FFFF6E
521 * VALID - Intel documentation is unclear but I believe this
522 * must be read as a 1 to indicate that the rest of
523 * the bits in the register are valid.
525 * HASDMA - Indicates that the chip is DMA-capable. Presumably
526 * in certain virtualization cases the chip might be
527 * set to not be DMA-capable.
529 * INTR_IO - Indicates that all interrupts are combined to
530 * generate one interrupt. If not set, interrupts
531 * are individual (more virtualization stuff?)
533 * HCCNT_RO - Indicates that the clock timing registers are
534 * RW. If not set, the registers are RO.
535 * (more virtualization stuff).
537 * MAXSPEED - Indicates the maximum speed supported.
539 * DATAW - Indicates the internal bus width in bits.
541 #define IG4_PARAM1_TXFIFO_DEPTH(v) ((((v) >> 16) & 0xFF) + 1)
542 #define IG4_PARAM1_RXFIFO_DEPTH(v) ((((v) >> 8) & 0xFF) + 1)
543 #define IG4_PARAM1_CONFIG_VALID 0x00000080
544 #define IG4_PARAM1_CONFIG_HASDMA 0x00000040
545 #define IG4_PARAM1_CONFIG_INTR_IO 0x00000020
546 #define IG4_PARAM1_CONFIG_HCCNT_RO 0x00000010
547 #define IG4_PARAM1_CONFIG_MAXSPEED_MASK 0x0000000C
548 #define IG4_PARAM1_CONFIG_DATAW_MASK 0x00000003
550 #define IG4_CONFIG_MAXSPEED_RESERVED00 0x00000000
551 #define IG4_CONFIG_MAXSPEED_STANDARD 0x00000004
552 #define IG4_CONFIG_MAXSPEED_FAST 0x00000008
553 #define IG4_CONFIG_MAXSPEED_HIGH 0x0000000C
555 #define IG4_CONFIG_DATAW_8 0x00000000
556 #define IG4_CONFIG_DATAW_16 0x00000001
557 #define IG4_CONFIG_DATAW_32 0x00000002
558 #define IG4_CONFIG_DATAW_RESERVED11 0x00000003
561 * COMP_VER - (RO) Component Version Register 22.2.36
563 * Contains the chip version number. All 32 bits.
565 #define IG4_COMP_MIN_VER 0x3131352A
568 * COMP_TYPE - (RO) (linux) Endian and bus width probe
570 * Read32 from this register and test against IG4_COMP_TYPE
571 * to determine the bus width. e.g. 01404457 = endian-reversed,
572 * and 00000140 or 00004457 means internal 16-bit bus (?).
574 * This register is not in the intel documentation, I pulled it
575 * from the linux driver i2c-designware-core.c.
577 #define IG4_COMP_TYPE 0x44570140
580 * RESETS - (RW) Resets Register 22.2.37
582 * Used to reset the I2C host controller by SW. There is no timing
583 * requirement, software can assert and de-assert in back-to-back
586 * 00 I2C host controller is NOT in reset.
589 * 11 I2C host controller is in reset.
591 #define IG4_RESETS_ASSERT_HSW 0x0003
592 #define IG4_RESETS_DEASSERT_HSW 0x0000
594 /* Skylake-U/Y and Kaby Lake-U/Y have the reset bits inverted */
595 #define IG4_RESETS_DEASSERT_SKL 0x0003
596 #define IG4_RESETS_ASSERT_SKL 0x0000
598 /* Newer versions of the I2C controller allow to check whether
599 * the above ASSERT/DEASSERT is necessary by querying the DEVIDLE_CONTROL
602 * the RESTORE_REQUIRED bit can be cleared by writing 1
603 * the DEVICE_IDLE status can be set to put the controller in an idle state
606 #define IG4_RESTORE_REQUIRED 0x0008
607 #define IG4_DEVICE_IDLE 0x0004
610 * GENERAL - (RW) General Reigster 22.2.38
612 * IOVOLT 0=1.8V 1=3.3V
616 * In Auto mode the BIOS will write to the host controller's
617 * AUTO LTR Value register (offset 0x0814) with the active
618 * state LTR value, and will write to the SW LTR Value register
619 * (offset 0x0810) with the idle state LTR value.
621 * In SW mode the SW will write to the host controller SW LTR
622 * value (offset 0x0810). It is the SW responsibility to update
623 * the LTR with the appropriate value.
625 #define IG4_GENERAL_IOVOLT3_3 0x0008
626 #define IG4_GENERAL_SWMODE 0x0004
629 * SW_LTR_VALUE - (RW) SW LTR Value Register 22.2.39
630 * AUTO_LTR_VALUE - (RW) SW LTR Value Register 22.2.40
632 * Default value is 0x00000800 which means the best possible
633 * service/response time.
635 * It isn't quite clear how the snooping works. There are two scale
636 * bits for both sets but two of the four codes are reserved. The
637 * *SNOOP_VALUE() is specified as a 10-bit latency value. If 0, it
638 * indicates that the device cannot tolerate any delay and needs the
639 * best possible service/response time.
641 * I think this is for snooping (testing) the I2C bus. The lowest
642 * delay (0) probably runs the controller polling at a high, power hungry
645 #define IG4_SWLTR_NSNOOP_REQ 0x80000000 /* (ro) */
646 #define IG4_SWLTR_NSNOOP_SCALE_MASK 0x1C000000 /* (ro) */
647 #define IG4_SWLTR_NSNOOP_SCALE_1US 0x08000000 /* (ro) */
648 #define IG4_SWLTR_NSNOOP_SCALE_32US 0x0C000000 /* (ro) */
649 #define IG4_SWLTR_NSNOOP_VALUE_DECODE(v) (((v) >> 16) & 0x3F)
650 #define IG4_SWLTR_NSNOOP_VALUE_ENCODE(v) (((v) & 0x3F) << 16)
652 #define IG4_SWLTR_SNOOP_REQ 0x00008000 /* (rw) */
653 #define IG4_SWLTR_SNOOP_SCALE_MASK 0x00001C00 /* (rw) */
654 #define IG4_SWLTR_SNOOP_SCALE_1US 0x00000800 /* (rw) */
655 #define IG4_SWLTR_SNOOP_SCALE_32US 0x00000C00 /* (rw) */
656 #define IG4_SWLTR_SNOOP_VALUE_DECODE(v) ((v) & 0x3F)
657 #define IG4_SWLTR_SNOOP_VALUE_ENCODE(v) ((v) & 0x3F)
659 #endif /* _ICHIIC_IG4_REG_H_ */