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1 .. SPDX-License-Identifier: GPL-2.0
10 - A natively half-duplex Quad I/O capable SPI master
11 - Low latency I2C interface to support HIDI2C compliant devices
12 - A HW sequencer with RW DMA capability to system memory
29 -------------------------------
31 Below diagram illustrates the high-level architecture of THC software/hardware stack, which is fully
36 ----------------------------------------------
37 | +-----------------------------------+ |
39 | +-----------------------------------+ |
40 | +-----------------------------------+ |
41 | | HID Multi-touch Driver | |
42 | +-----------------------------------+ |
43 | +-----------------------------------+ |
45 | +-----------------------------------+ |
46 | +-----------------------------------+ |
48 | +-----------------------------------+ |
49 | +-----------------------------------+ |
51 | +-----------------------------------+ |
52 | +----------------+ +----------------+ |
54 | +----------------+ +----------------+ |
55 ----------------------------------------------
56 ----------------------------------------------
57 | +-----------------------------------+ |
59 | +-----------------------------------+ |
60 | +-----------------------------------+ |
62 | +-----------------------------------+ |
63 | +-----------------------------------+ |
65 | +-----------------------------------+ |
66 ----------------------------------------------
79 low-level driver that manages the THC Controller and implements HIDSPI/HIDI2C protocol.
83 ------------------------
86 ---------------------------------
88 | +---------------------------+ |
90 | +---------------------------+ |
91 | +---------------------------+ |
93 | +---------------------------+ |
94 +---------------+ | +------------+ +------------+ |
95 | System Memory +---+--+ DMA | | PIO | |
96 +---------------+ | +------------+ +------------+ |
97 | +---------------------------+ |
99 | +---------------------------+ |
100 | +------------+ +------------+ |
103 | +------------+ +------------+ |
104 ---------------------------------
115 PIO can let driver manually write/read data to/from Touch ICs, instead, THC DMA can
116 automatically write/read data without driver involved.
133 ------------------
141 --------------------
164 | --------------------THC sends---------------------------------|
169 | ---------THC Sends---------------||-----Touch IC sends--------|
177 directly, THC needs to use PIO read (by setting SubIP read opcode) to I2C subIP APB registers'
195 ----------
198 read or PIO write.
200 When THC is configured to SPI mode, opcodes are used for determining the read/write IO mode.
206 0x0B Read Single I/O
208 0xBB Read Dual I/O
210 0xEB Read Quad I/O
220 I2C SubIP APB register read, I2C SubIP APB register write, I2C touch IC device read,
221 I2C touch IC device write, I2C touch IC device write followed by read.
223 Here are the THC pre-defined opcodes for I2C mode:
228 0x12 Read I2C SubIP APB internal registers 0h - FFh
229 0x13 Write I2C SubIP APB internal registers 0h - FFh
230 0x14 Read external Touch IC through I2C bus N/A
232 0x1C Write then read external Touch IC through I2C bus N/A
236 -------
240 I/O operations, driver should pre-program PIO control registers and PIO data registers and kick
242 operations (PIO read/write/write followed by read).
247 A status bit indicates when the cycle has completed allowing the driver to know when read results
255 always in HID device descriptor which needs THC driver to read it out from HID Device (Touch IC).
256 So PIO typical use case is, before DMA initialization, write RESET command (PIO write), read
257 RESET response (PIO read or PIO write followed by read), write Power ON command (PIO write), read
258 device descriptor (PIO read).
262 - Program read/write data size in THC_SS_BC.
263 - Program I/O target address in THC_SW_SEQ_DATA0_ADDR.
264 - If write, program the write data in THC_SW_SEQ_DATA0..THC_SW_SEQ_DATAn.
265 - Program the PIO opcode in THC_SS_CMD.
266 - Set TSSGO = 1 to start the PIO write sequence.
267 - If THC_SS_CD_IE = 1, SW will receives a MSI when the PIO is completed.
268 - If read, read out the data in THC_SW_SEQ_DATA0..THC_SW_SEQ_DATAn.
271 -------
273 THC has 4 DMA channels: Read DMA1, Read DMA2, Write DMA and Software DMA.
275 3.3.1 Read DMA Channel
278 THC has two Read DMA engines: 1st RxDMA (RxDMA1) and 2nd RxDMA (RxDMA2). RxDMA1 is reserved for
283 software, THC will start auto-handling receiving logic.
289 RxDMA PRD table read pointer, then trigger a MSI interrupt to notify driver RxDMA finishing
296 input report data. After that, THC update RxDMA PRD table read pointer, then trigger a MSI interrupt
300 waiting for interrupt ready then read out the data from system memory.
305 THC supports a software triggerred RxDMA mode to read the touch data from touch IC. This SW RxDMA
308 interrupt. It gives a flexiblity to software driver to use RxDMA read Touch IC data in any time.
310 Before software starts a SW RxDMA, it shall stop the 1st and 2nd RxDMA, clear PRD read/write pointer
328 -------
344 ------------------------ -------------- --------------
345 | PRD table base address +----+ PRD table #1 +-----+ PRD Entry #1 |
346 ------------------------ -------------- --------------
347 --------------
349 --------------
350 --------------
352 --------------
354 The read DMA engine supports multiple PRD tables held within a circular buffer that allow the THC
355 to support multiple data buffers from the Touch IC. This allows host SW to arm the Read DMA engine
360 To simplify the design, SW assumes worst-case memory fragmentation. Therefore,each PRD table shall
362 number of PRD-entries per PRD table.
364 SW allocates up to 128 PRD tables per Read DMA engine as specified in the THC_M_PRT_RPRD_CNTRL.PCD
374 3.4.2 PRD Write pointer and read pointer
377 As PRD tables are organized as a Circular Buffer (CB), a read pointer and a write pointer for a CB
381 in a PRD entry. At this point HW increments the PRD read pointer. Thus, the read pointer points
383 buffer's depth has been traversed with bit[7] the Rollover bit. E.g. if the DMA CB depth is equal
384 to 4 entries (0011b), then the read pointers will follow this pattern (HW is required to honor
389 circular buffer's depth has been traversed with Bit[7] as the rollover bit. E.g. if the DMA CB
419 .. code-block:: c
437 --------------
439 - Call ACPI _RST method to reset Touch IC device.
440 - Read the reset response from TIC through PIO read.
441 - Issue a command to retrieve device descriptor from Touch IC through PIO write.
442 - Read the device descriptor from Touch IC through PIO read.
443 - If the device descriptor is valid, allocate DMA buffers and configure all DMA channels.
444 - Issue a command to retrieve report descriptor from Touch IC through DMA.
447 --------------------------
451 - Touch IC interrupts the THC Controller using an in-band THC interrupt.
452 - THC Sequencer reads the input report header by transmitting read approval as a signal
453 to the Touch IC to prepare for host to read from the device.
454 - THC Sequencer executes a Input Report Body Read operation corresponding to the value
456 - THC DMA engine begins fetching data from the THC Sequencer and writes to host memory
458 THC Sequencer signals all data has been read or the THC DMA Read Engine reaches the
460 - The THC Sequencer checks for the “Last Fragment Flag” bit in the Input Report Header.
462 - If the “Last Fragment Flag” bit is enabled the THC Sequencer enters End-of-Frame Processing.
466 - THC DMA engine increments the read pointer of the Read PRD CB, sets EOF interrupt status
468 - If THC EOF interrupt is enabled by the driver in the control register (THC_M_PRT_READ_DMA_CNTRL_2…
471 Sequence of steps to read data from RX DMA buffer:
473 - THC QuickSPI driver checks CB write Ptr and CB read Ptr to identify if any data frame in DMA
475 - THC QuickSPI driver gets first unprocessed PRD table.
476 - THC QuickSPI driver scans all PRD entries in this PRD table to calculate the total frame size.
477 - THC QuickSPI driver copies all frame data out.
478 - THC QuickSPI driver checks the data type according to input report body, and calls related
480 - THC QuickSPI driver updates write Ptr.
483 ---------------------------
487 - HID core calls raw_request callback with a request to THC QuickSPI driver.
488 - THC QuickSPI Driver converts request provided data into the output report packet and copies it
490 - Start TxDMA to complete the write operation.
496 --------------
498 - Read device descriptor from Touch IC device through PIO write followed by read.
499 - If the device descriptor is valid, allocate DMA buffers and configure all DMA channels.
500 - Use PIO or TxDMA to write a SET_POWER request to TIC's command register, and check if the
502 - Use PIO or TxDMA to write a RESET request to TIC's command register. If the write operation
504 - Use SWDMA to read report descriptor through TIC's report descriptor register.
507 --------------------------
511 - Touch IC asserts the interrupt indicating that it has an interrupt to send to HOST.
512 THC Sequencer issues a READ request over the I2C bus. The HIDI2C device returns the
514 - THC Sequencer continues the Read operation as per the size of data indicated in the
516 - THC DMA engine begins fetching data from the THC Sequencer and writes to host memory
519 signals all data has been read or the THC DMA Read Engine reaches the end of it's last
521 - THC Sequencer enters End-of-Input Report Processing.
522 - If the device has no more input reports to send to the host, it de-asserts the interrupt
528 - THC DMA engine increments the read pointer of the Read PRD CB, sets EOF interrupt status
530 - If THC EOF interrupt is enabled by the driver in the control register
533 Sequence of steps to read data from RX DMA buffer:
535 - THC QuickI2C driver checks CB write Ptr and CB read Ptr to identify if any data frame in DMA
537 - THC QuickI2C driver gets first unprocessed PRD table.
538 - THC QuickI2C driver scans all PRD entries in this PRD table to calculate the total frame size.
539 - THC QuickI2C driver copies all frame data out.
540 - THC QuickI2C driver call hid_input_report to send the input report content to HID core, which
543 - THC QuickI2C driver updates write Ptr.
546 ---------------------------
550 - HID core call THC QuickI2C raw_request callback.
551 - THC QuickI2C uses PIO or TXDMA to write a SET_REPORT request to TIC's command register. Report
553 - THC QuickI2C programs TxDMA buffer with TX Data to be written to TIC's data register. The first
567 - HIDSPI: https://download.microsoft.com/download/c/a/0/ca07aef3-3e10-4022-b1e9-c98cea99465d/HidSpi…
568 - HIDI2C: https://download.microsoft.com/download/7/d/d/7dd44bb7-2a7a-4505-ac1c-7227d3d96d5b/hid-ov…