287 строки
8.3 KiB
C
287 строки
8.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* include/linux/amba/pl022.h
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*
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* Copyright (C) 2008-2009 ST-Ericsson AB
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* Copyright (C) 2006 STMicroelectronics Pvt. Ltd.
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*
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* Author: Linus Walleij <linus.walleij@stericsson.com>
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*
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* Initial version inspired by:
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* linux-2.6.17-rc3-mm1/drivers/spi/pxa2xx_spi.c
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* Initial adoption to PL022 by:
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* Sachin Verma <sachin.verma@st.com>
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*/
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#ifndef _SSP_PL022_H
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#define _SSP_PL022_H
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#include <linux/types.h>
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/**
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* whether SSP is in loopback mode or not
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*/
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enum ssp_loopback {
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LOOPBACK_DISABLED,
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LOOPBACK_ENABLED
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};
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/**
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* enum ssp_interface - interfaces allowed for this SSP Controller
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* @SSP_INTERFACE_MOTOROLA_SPI: Motorola Interface
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* @SSP_INTERFACE_TI_SYNC_SERIAL: Texas Instrument Synchronous Serial
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* interface
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* @SSP_INTERFACE_NATIONAL_MICROWIRE: National Semiconductor Microwire
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* interface
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* @SSP_INTERFACE_UNIDIRECTIONAL: Unidirectional interface (STn8810
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* &STn8815 only)
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*/
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enum ssp_interface {
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SSP_INTERFACE_MOTOROLA_SPI,
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SSP_INTERFACE_TI_SYNC_SERIAL,
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SSP_INTERFACE_NATIONAL_MICROWIRE,
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SSP_INTERFACE_UNIDIRECTIONAL
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};
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/**
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* enum ssp_hierarchy - whether SSP is configured as Master or Slave
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*/
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enum ssp_hierarchy {
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SSP_MASTER,
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SSP_SLAVE
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};
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/**
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* enum ssp_clock_params - clock parameters, to set SSP clock at a
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* desired freq
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*/
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struct ssp_clock_params {
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u8 cpsdvsr; /* value from 2 to 254 (even only!) */
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u8 scr; /* value from 0 to 255 */
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};
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/**
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* enum ssp_rx_endian - endianess of Rx FIFO Data
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* this feature is only available in ST versionf of PL022
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*/
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enum ssp_rx_endian {
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SSP_RX_MSB,
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SSP_RX_LSB
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};
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/**
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* enum ssp_tx_endian - endianess of Tx FIFO Data
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*/
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enum ssp_tx_endian {
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SSP_TX_MSB,
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SSP_TX_LSB
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};
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/**
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* enum ssp_data_size - number of bits in one data element
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*/
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enum ssp_data_size {
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SSP_DATA_BITS_4 = 0x03, SSP_DATA_BITS_5, SSP_DATA_BITS_6,
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SSP_DATA_BITS_7, SSP_DATA_BITS_8, SSP_DATA_BITS_9,
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SSP_DATA_BITS_10, SSP_DATA_BITS_11, SSP_DATA_BITS_12,
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SSP_DATA_BITS_13, SSP_DATA_BITS_14, SSP_DATA_BITS_15,
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SSP_DATA_BITS_16, SSP_DATA_BITS_17, SSP_DATA_BITS_18,
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SSP_DATA_BITS_19, SSP_DATA_BITS_20, SSP_DATA_BITS_21,
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SSP_DATA_BITS_22, SSP_DATA_BITS_23, SSP_DATA_BITS_24,
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SSP_DATA_BITS_25, SSP_DATA_BITS_26, SSP_DATA_BITS_27,
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SSP_DATA_BITS_28, SSP_DATA_BITS_29, SSP_DATA_BITS_30,
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SSP_DATA_BITS_31, SSP_DATA_BITS_32
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};
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/**
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* enum ssp_mode - SSP mode of operation (Communication modes)
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*/
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enum ssp_mode {
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INTERRUPT_TRANSFER,
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POLLING_TRANSFER,
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DMA_TRANSFER
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};
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/**
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* enum ssp_rx_level_trig - receive FIFO watermark level which triggers
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* IT: Interrupt fires when _N_ or more elements in RX FIFO.
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*/
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enum ssp_rx_level_trig {
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SSP_RX_1_OR_MORE_ELEM,
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SSP_RX_4_OR_MORE_ELEM,
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SSP_RX_8_OR_MORE_ELEM,
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SSP_RX_16_OR_MORE_ELEM,
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SSP_RX_32_OR_MORE_ELEM
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};
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/**
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* Transmit FIFO watermark level which triggers (IT Interrupt fires
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* when _N_ or more empty locations in TX FIFO)
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*/
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enum ssp_tx_level_trig {
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SSP_TX_1_OR_MORE_EMPTY_LOC,
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SSP_TX_4_OR_MORE_EMPTY_LOC,
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SSP_TX_8_OR_MORE_EMPTY_LOC,
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SSP_TX_16_OR_MORE_EMPTY_LOC,
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SSP_TX_32_OR_MORE_EMPTY_LOC
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};
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/**
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* enum SPI Clock Phase - clock phase (Motorola SPI interface only)
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* @SSP_CLK_FIRST_EDGE: Receive data on first edge transition (actual direction depends on polarity)
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* @SSP_CLK_SECOND_EDGE: Receive data on second edge transition (actual direction depends on polarity)
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*/
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enum ssp_spi_clk_phase {
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SSP_CLK_FIRST_EDGE,
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SSP_CLK_SECOND_EDGE
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};
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/**
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* enum SPI Clock Polarity - clock polarity (Motorola SPI interface only)
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* @SSP_CLK_POL_IDLE_LOW: Low inactive level
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* @SSP_CLK_POL_IDLE_HIGH: High inactive level
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*/
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enum ssp_spi_clk_pol {
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SSP_CLK_POL_IDLE_LOW,
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SSP_CLK_POL_IDLE_HIGH
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};
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/**
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* Microwire Conrol Lengths Command size in microwire format
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*/
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enum ssp_microwire_ctrl_len {
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SSP_BITS_4 = 0x03, SSP_BITS_5, SSP_BITS_6,
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SSP_BITS_7, SSP_BITS_8, SSP_BITS_9,
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SSP_BITS_10, SSP_BITS_11, SSP_BITS_12,
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SSP_BITS_13, SSP_BITS_14, SSP_BITS_15,
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SSP_BITS_16, SSP_BITS_17, SSP_BITS_18,
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SSP_BITS_19, SSP_BITS_20, SSP_BITS_21,
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SSP_BITS_22, SSP_BITS_23, SSP_BITS_24,
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SSP_BITS_25, SSP_BITS_26, SSP_BITS_27,
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SSP_BITS_28, SSP_BITS_29, SSP_BITS_30,
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SSP_BITS_31, SSP_BITS_32
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};
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/**
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* enum Microwire Wait State
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* @SSP_MWIRE_WAIT_ZERO: No wait state inserted after last command bit
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* @SSP_MWIRE_WAIT_ONE: One wait state inserted after last command bit
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*/
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enum ssp_microwire_wait_state {
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SSP_MWIRE_WAIT_ZERO,
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SSP_MWIRE_WAIT_ONE
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};
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/**
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* enum ssp_duplex - whether Full/Half Duplex on microwire, only
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* available in the ST Micro variant.
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* @SSP_MICROWIRE_CHANNEL_FULL_DUPLEX: SSPTXD becomes bi-directional,
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* SSPRXD not used
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* @SSP_MICROWIRE_CHANNEL_HALF_DUPLEX: SSPTXD is an output, SSPRXD is
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* an input.
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*/
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enum ssp_duplex {
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SSP_MICROWIRE_CHANNEL_FULL_DUPLEX,
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SSP_MICROWIRE_CHANNEL_HALF_DUPLEX
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};
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/**
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* enum ssp_clkdelay - an optional clock delay on the feedback clock
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* only available in the ST Micro PL023 variant.
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* @SSP_FEEDBACK_CLK_DELAY_NONE: no delay, the data coming in from the
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* slave is sampled directly
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* @SSP_FEEDBACK_CLK_DELAY_1T: the incoming slave data is sampled with
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* a delay of T-dt
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* @SSP_FEEDBACK_CLK_DELAY_2T: dito with a delay if 2T-dt
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* @SSP_FEEDBACK_CLK_DELAY_3T: dito with a delay if 3T-dt
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* @SSP_FEEDBACK_CLK_DELAY_4T: dito with a delay if 4T-dt
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* @SSP_FEEDBACK_CLK_DELAY_5T: dito with a delay if 5T-dt
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* @SSP_FEEDBACK_CLK_DELAY_6T: dito with a delay if 6T-dt
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* @SSP_FEEDBACK_CLK_DELAY_7T: dito with a delay if 7T-dt
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*/
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enum ssp_clkdelay {
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SSP_FEEDBACK_CLK_DELAY_NONE,
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SSP_FEEDBACK_CLK_DELAY_1T,
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SSP_FEEDBACK_CLK_DELAY_2T,
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SSP_FEEDBACK_CLK_DELAY_3T,
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SSP_FEEDBACK_CLK_DELAY_4T,
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SSP_FEEDBACK_CLK_DELAY_5T,
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SSP_FEEDBACK_CLK_DELAY_6T,
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SSP_FEEDBACK_CLK_DELAY_7T
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};
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/**
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* CHIP select/deselect commands
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*/
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enum ssp_chip_select {
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SSP_CHIP_SELECT,
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SSP_CHIP_DESELECT
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};
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struct dma_chan;
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/**
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* struct pl022_ssp_master - device.platform_data for SPI controller devices.
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* @bus_id: identifier for this bus
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* @num_chipselect: chipselects are used to distinguish individual
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* SPI slaves, and are numbered from zero to num_chipselects - 1.
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* each slave has a chipselect signal, but it's common that not
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* every chipselect is connected to a slave.
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* @enable_dma: if true enables DMA driven transfers.
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* @dma_rx_param: parameter to locate an RX DMA channel.
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* @dma_tx_param: parameter to locate a TX DMA channel.
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* @autosuspend_delay: delay in ms following transfer completion before the
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* runtime power management system suspends the device. A setting of 0
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* indicates no delay and the device will be suspended immediately.
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* @rt: indicates the controller should run the message pump with realtime
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* priority to minimise the transfer latency on the bus.
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* @chipselects: list of <num_chipselects> chip select gpios
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*/
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struct pl022_ssp_controller {
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u16 bus_id;
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u8 num_chipselect;
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u8 enable_dma:1;
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bool (*dma_filter)(struct dma_chan *chan, void *filter_param);
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void *dma_rx_param;
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void *dma_tx_param;
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int autosuspend_delay;
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bool rt;
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int *chipselects;
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};
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/**
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* struct ssp_config_chip - spi_board_info.controller_data for SPI
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* slave devices, copied to spi_device.controller_data.
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*
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* @iface: Interface type(Motorola, TI, Microwire, Universal)
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* @hierarchy: sets whether interface is master or slave
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* @slave_tx_disable: SSPTXD is disconnected (in slave mode only)
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* @clk_freq: Tune freq parameters of SSP(when in master mode)
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* @com_mode: communication mode: polling, Interrupt or DMA
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* @rx_lev_trig: Rx FIFO watermark level (for IT & DMA mode)
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* @tx_lev_trig: Tx FIFO watermark level (for IT & DMA mode)
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* @ctrl_len: Microwire interface: Control length
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* @wait_state: Microwire interface: Wait state
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* @duplex: Microwire interface: Full/Half duplex
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* @clkdelay: on the PL023 variant, the delay in feeback clock cycles
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* before sampling the incoming line
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* @cs_control: function pointer to board-specific function to
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* assert/deassert I/O port to control HW generation of devices chip-select.
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*/
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struct pl022_config_chip {
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enum ssp_interface iface;
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enum ssp_hierarchy hierarchy;
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bool slave_tx_disable;
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struct ssp_clock_params clk_freq;
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enum ssp_mode com_mode;
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enum ssp_rx_level_trig rx_lev_trig;
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enum ssp_tx_level_trig tx_lev_trig;
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enum ssp_microwire_ctrl_len ctrl_len;
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enum ssp_microwire_wait_state wait_state;
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enum ssp_duplex duplex;
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enum ssp_clkdelay clkdelay;
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void (*cs_control) (u32 control);
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};
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#endif /* _SSP_PL022_H */
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