296 lines
8.7 KiB
C
296 lines
8.7 KiB
C
/*
|
|
* include/linux/amba/pl022.h
|
|
*
|
|
* Copyright (C) 2008-2009 ST-Ericsson AB
|
|
* Copyright (C) 2006 STMicroelectronics Pvt. Ltd.
|
|
*
|
|
* Author: Linus Walleij <linus.walleij@stericsson.com>
|
|
*
|
|
* Initial version inspired by:
|
|
* linux-2.6.17-rc3-mm1/drivers/spi/pxa2xx_spi.c
|
|
* Initial adoption to PL022 by:
|
|
* Sachin Verma <sachin.verma@st.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*/
|
|
|
|
#ifndef _SSP_PL022_H
|
|
#define _SSP_PL022_H
|
|
|
|
#include <linux/types.h>
|
|
|
|
/**
|
|
* whether SSP is in loopback mode or not
|
|
*/
|
|
enum ssp_loopback {
|
|
LOOPBACK_DISABLED,
|
|
LOOPBACK_ENABLED
|
|
};
|
|
|
|
/**
|
|
* enum ssp_interface - interfaces allowed for this SSP Controller
|
|
* @SSP_INTERFACE_MOTOROLA_SPI: Motorola Interface
|
|
* @SSP_INTERFACE_TI_SYNC_SERIAL: Texas Instrument Synchronous Serial
|
|
* interface
|
|
* @SSP_INTERFACE_NATIONAL_MICROWIRE: National Semiconductor Microwire
|
|
* interface
|
|
* @SSP_INTERFACE_UNIDIRECTIONAL: Unidirectional interface (STn8810
|
|
* &STn8815 only)
|
|
*/
|
|
enum ssp_interface {
|
|
SSP_INTERFACE_MOTOROLA_SPI,
|
|
SSP_INTERFACE_TI_SYNC_SERIAL,
|
|
SSP_INTERFACE_NATIONAL_MICROWIRE,
|
|
SSP_INTERFACE_UNIDIRECTIONAL
|
|
};
|
|
|
|
/**
|
|
* enum ssp_hierarchy - whether SSP is configured as Master or Slave
|
|
*/
|
|
enum ssp_hierarchy {
|
|
SSP_MASTER,
|
|
SSP_SLAVE
|
|
};
|
|
|
|
/**
|
|
* enum ssp_clock_params - clock parameters, to set SSP clock at a
|
|
* desired freq
|
|
*/
|
|
struct ssp_clock_params {
|
|
u8 cpsdvsr; /* value from 2 to 254 (even only!) */
|
|
u8 scr; /* value from 0 to 255 */
|
|
};
|
|
|
|
/**
|
|
* enum ssp_rx_endian - endianess of Rx FIFO Data
|
|
* this feature is only available in ST versionf of PL022
|
|
*/
|
|
enum ssp_rx_endian {
|
|
SSP_RX_MSB,
|
|
SSP_RX_LSB
|
|
};
|
|
|
|
/**
|
|
* enum ssp_tx_endian - endianess of Tx FIFO Data
|
|
*/
|
|
enum ssp_tx_endian {
|
|
SSP_TX_MSB,
|
|
SSP_TX_LSB
|
|
};
|
|
|
|
/**
|
|
* enum ssp_data_size - number of bits in one data element
|
|
*/
|
|
enum ssp_data_size {
|
|
SSP_DATA_BITS_4 = 0x03, SSP_DATA_BITS_5, SSP_DATA_BITS_6,
|
|
SSP_DATA_BITS_7, SSP_DATA_BITS_8, SSP_DATA_BITS_9,
|
|
SSP_DATA_BITS_10, SSP_DATA_BITS_11, SSP_DATA_BITS_12,
|
|
SSP_DATA_BITS_13, SSP_DATA_BITS_14, SSP_DATA_BITS_15,
|
|
SSP_DATA_BITS_16, SSP_DATA_BITS_17, SSP_DATA_BITS_18,
|
|
SSP_DATA_BITS_19, SSP_DATA_BITS_20, SSP_DATA_BITS_21,
|
|
SSP_DATA_BITS_22, SSP_DATA_BITS_23, SSP_DATA_BITS_24,
|
|
SSP_DATA_BITS_25, SSP_DATA_BITS_26, SSP_DATA_BITS_27,
|
|
SSP_DATA_BITS_28, SSP_DATA_BITS_29, SSP_DATA_BITS_30,
|
|
SSP_DATA_BITS_31, SSP_DATA_BITS_32
|
|
};
|
|
|
|
/**
|
|
* enum ssp_mode - SSP mode of operation (Communication modes)
|
|
*/
|
|
enum ssp_mode {
|
|
INTERRUPT_TRANSFER,
|
|
POLLING_TRANSFER,
|
|
DMA_TRANSFER
|
|
};
|
|
|
|
/**
|
|
* enum ssp_rx_level_trig - receive FIFO watermark level which triggers
|
|
* IT: Interrupt fires when _N_ or more elements in RX FIFO.
|
|
*/
|
|
enum ssp_rx_level_trig {
|
|
SSP_RX_1_OR_MORE_ELEM,
|
|
SSP_RX_4_OR_MORE_ELEM,
|
|
SSP_RX_8_OR_MORE_ELEM,
|
|
SSP_RX_16_OR_MORE_ELEM,
|
|
SSP_RX_32_OR_MORE_ELEM
|
|
};
|
|
|
|
/**
|
|
* Transmit FIFO watermark level which triggers (IT Interrupt fires
|
|
* when _N_ or more empty locations in TX FIFO)
|
|
*/
|
|
enum ssp_tx_level_trig {
|
|
SSP_TX_1_OR_MORE_EMPTY_LOC,
|
|
SSP_TX_4_OR_MORE_EMPTY_LOC,
|
|
SSP_TX_8_OR_MORE_EMPTY_LOC,
|
|
SSP_TX_16_OR_MORE_EMPTY_LOC,
|
|
SSP_TX_32_OR_MORE_EMPTY_LOC
|
|
};
|
|
|
|
/**
|
|
* enum SPI Clock Phase - clock phase (Motorola SPI interface only)
|
|
* @SSP_CLK_FIRST_EDGE: Receive data on first edge transition (actual direction depends on polarity)
|
|
* @SSP_CLK_SECOND_EDGE: Receive data on second edge transition (actual direction depends on polarity)
|
|
*/
|
|
enum ssp_spi_clk_phase {
|
|
SSP_CLK_FIRST_EDGE,
|
|
SSP_CLK_SECOND_EDGE
|
|
};
|
|
|
|
/**
|
|
* enum SPI Clock Polarity - clock polarity (Motorola SPI interface only)
|
|
* @SSP_CLK_POL_IDLE_LOW: Low inactive level
|
|
* @SSP_CLK_POL_IDLE_HIGH: High inactive level
|
|
*/
|
|
enum ssp_spi_clk_pol {
|
|
SSP_CLK_POL_IDLE_LOW,
|
|
SSP_CLK_POL_IDLE_HIGH
|
|
};
|
|
|
|
/**
|
|
* Microwire Conrol Lengths Command size in microwire format
|
|
*/
|
|
enum ssp_microwire_ctrl_len {
|
|
SSP_BITS_4 = 0x03, SSP_BITS_5, SSP_BITS_6,
|
|
SSP_BITS_7, SSP_BITS_8, SSP_BITS_9,
|
|
SSP_BITS_10, SSP_BITS_11, SSP_BITS_12,
|
|
SSP_BITS_13, SSP_BITS_14, SSP_BITS_15,
|
|
SSP_BITS_16, SSP_BITS_17, SSP_BITS_18,
|
|
SSP_BITS_19, SSP_BITS_20, SSP_BITS_21,
|
|
SSP_BITS_22, SSP_BITS_23, SSP_BITS_24,
|
|
SSP_BITS_25, SSP_BITS_26, SSP_BITS_27,
|
|
SSP_BITS_28, SSP_BITS_29, SSP_BITS_30,
|
|
SSP_BITS_31, SSP_BITS_32
|
|
};
|
|
|
|
/**
|
|
* enum Microwire Wait State
|
|
* @SSP_MWIRE_WAIT_ZERO: No wait state inserted after last command bit
|
|
* @SSP_MWIRE_WAIT_ONE: One wait state inserted after last command bit
|
|
*/
|
|
enum ssp_microwire_wait_state {
|
|
SSP_MWIRE_WAIT_ZERO,
|
|
SSP_MWIRE_WAIT_ONE
|
|
};
|
|
|
|
/**
|
|
* enum ssp_duplex - whether Full/Half Duplex on microwire, only
|
|
* available in the ST Micro variant.
|
|
* @SSP_MICROWIRE_CHANNEL_FULL_DUPLEX: SSPTXD becomes bi-directional,
|
|
* SSPRXD not used
|
|
* @SSP_MICROWIRE_CHANNEL_HALF_DUPLEX: SSPTXD is an output, SSPRXD is
|
|
* an input.
|
|
*/
|
|
enum ssp_duplex {
|
|
SSP_MICROWIRE_CHANNEL_FULL_DUPLEX,
|
|
SSP_MICROWIRE_CHANNEL_HALF_DUPLEX
|
|
};
|
|
|
|
/**
|
|
* enum ssp_clkdelay - an optional clock delay on the feedback clock
|
|
* only available in the ST Micro PL023 variant.
|
|
* @SSP_FEEDBACK_CLK_DELAY_NONE: no delay, the data coming in from the
|
|
* slave is sampled directly
|
|
* @SSP_FEEDBACK_CLK_DELAY_1T: the incoming slave data is sampled with
|
|
* a delay of T-dt
|
|
* @SSP_FEEDBACK_CLK_DELAY_2T: dito with a delay if 2T-dt
|
|
* @SSP_FEEDBACK_CLK_DELAY_3T: dito with a delay if 3T-dt
|
|
* @SSP_FEEDBACK_CLK_DELAY_4T: dito with a delay if 4T-dt
|
|
* @SSP_FEEDBACK_CLK_DELAY_5T: dito with a delay if 5T-dt
|
|
* @SSP_FEEDBACK_CLK_DELAY_6T: dito with a delay if 6T-dt
|
|
* @SSP_FEEDBACK_CLK_DELAY_7T: dito with a delay if 7T-dt
|
|
*/
|
|
enum ssp_clkdelay {
|
|
SSP_FEEDBACK_CLK_DELAY_NONE,
|
|
SSP_FEEDBACK_CLK_DELAY_1T,
|
|
SSP_FEEDBACK_CLK_DELAY_2T,
|
|
SSP_FEEDBACK_CLK_DELAY_3T,
|
|
SSP_FEEDBACK_CLK_DELAY_4T,
|
|
SSP_FEEDBACK_CLK_DELAY_5T,
|
|
SSP_FEEDBACK_CLK_DELAY_6T,
|
|
SSP_FEEDBACK_CLK_DELAY_7T
|
|
};
|
|
|
|
/**
|
|
* CHIP select/deselect commands
|
|
*/
|
|
enum ssp_chip_select {
|
|
SSP_CHIP_SELECT,
|
|
SSP_CHIP_DESELECT
|
|
};
|
|
|
|
|
|
struct dma_chan;
|
|
/**
|
|
* struct pl022_ssp_master - device.platform_data for SPI controller devices.
|
|
* @bus_id: identifier for this bus
|
|
* @num_chipselect: chipselects are used to distinguish individual
|
|
* SPI slaves, and are numbered from zero to num_chipselects - 1.
|
|
* each slave has a chipselect signal, but it's common that not
|
|
* every chipselect is connected to a slave.
|
|
* @enable_dma: if true enables DMA driven transfers.
|
|
* @dma_rx_param: parameter to locate an RX DMA channel.
|
|
* @dma_tx_param: parameter to locate a TX DMA channel.
|
|
* @autosuspend_delay: delay in ms following transfer completion before the
|
|
* runtime power management system suspends the device. A setting of 0
|
|
* indicates no delay and the device will be suspended immediately.
|
|
* @rt: indicates the controller should run the message pump with realtime
|
|
* priority to minimise the transfer latency on the bus.
|
|
* @chipselects: list of <num_chipselects> chip select gpios
|
|
*/
|
|
struct pl022_ssp_controller {
|
|
u16 bus_id;
|
|
u8 num_chipselect;
|
|
u8 enable_dma:1;
|
|
bool (*dma_filter)(struct dma_chan *chan, void *filter_param);
|
|
void *dma_rx_param;
|
|
void *dma_tx_param;
|
|
int autosuspend_delay;
|
|
bool rt;
|
|
int *chipselects;
|
|
};
|
|
|
|
/**
|
|
* struct ssp_config_chip - spi_board_info.controller_data for SPI
|
|
* slave devices, copied to spi_device.controller_data.
|
|
*
|
|
* @iface: Interface type(Motorola, TI, Microwire, Universal)
|
|
* @hierarchy: sets whether interface is master or slave
|
|
* @slave_tx_disable: SSPTXD is disconnected (in slave mode only)
|
|
* @clk_freq: Tune freq parameters of SSP(when in master mode)
|
|
* @com_mode: communication mode: polling, Interrupt or DMA
|
|
* @rx_lev_trig: Rx FIFO watermark level (for IT & DMA mode)
|
|
* @tx_lev_trig: Tx FIFO watermark level (for IT & DMA mode)
|
|
* @ctrl_len: Microwire interface: Control length
|
|
* @wait_state: Microwire interface: Wait state
|
|
* @duplex: Microwire interface: Full/Half duplex
|
|
* @clkdelay: on the PL023 variant, the delay in feeback clock cycles
|
|
* before sampling the incoming line
|
|
* @cs_control: function pointer to board-specific function to
|
|
* assert/deassert I/O port to control HW generation of devices chip-select.
|
|
*/
|
|
struct pl022_config_chip {
|
|
enum ssp_interface iface;
|
|
enum ssp_hierarchy hierarchy;
|
|
bool slave_tx_disable;
|
|
struct ssp_clock_params clk_freq;
|
|
enum ssp_mode com_mode;
|
|
enum ssp_rx_level_trig rx_lev_trig;
|
|
enum ssp_tx_level_trig tx_lev_trig;
|
|
enum ssp_microwire_ctrl_len ctrl_len;
|
|
enum ssp_microwire_wait_state wait_state;
|
|
enum ssp_duplex duplex;
|
|
enum ssp_clkdelay clkdelay;
|
|
void (*cs_control) (u32 control);
|
|
};
|
|
|
|
#endif /* _SSP_PL022_H */
|