82 lines
2.5 KiB
C
82 lines
2.5 KiB
C
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/*
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* spi-tegra.h: SPI interface for Nvidia slink/spi controller.
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*
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* Copyright (c) 2011-2015, NVIDIA CORPORATION. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef _LINUX_SPI_TEGRA_H
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#define _LINUX_SPI_TEGRA_H
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#include <linux/spi/spi.h>
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struct tegra_spi_platform_data {
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int dma_req_sel;
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unsigned int spi_max_frequency;
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bool is_clkon_always;
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bool is_polling_mode;
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bool boost_reg_access;
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u8 def_chip_select;
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int rx_trig_words;
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int ls_bit;
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int gpio_slave_ready;
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bool slave_ready_active_high;
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int max_dma_buffer_size;
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const char *clk_pin;
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bool slave_ready_pol;
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};
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/*
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* Controller data from device to pass some info like
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* hw based chip select can be used or not and if yes
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* then CS hold and setup time.
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*/
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struct tegra_spi_device_controller_data {
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bool is_hw_based_cs;
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bool variable_length_transfer;
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/* Fix Me :: variable name*/
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bool new_features;
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int cs_setup_clk_count;
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int cs_hold_clk_count;
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int rx_clk_tap_delay;
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int tx_clk_tap_delay;
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int cs_inactive_cycles;
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int clk_delay_between_packets;
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int cs_gpio;
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};
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typedef int (*spi_callback)(void *client_data);
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/**
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* Client can register atmost two callbacks for notification depending upon
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* the requirement. Ready_func can be used to get notification that the
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* controller is ready for transction. In the callback functions client can
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* do specific action like toggling gpio to inform master if slave is ready
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* or not.
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*
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* @spi: struct spi_device - refer to linux/spi/spi.h
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* @ready_func: Callback function to notify clilent that slave is ready.
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* @isr_func: Callback function to notify clilent that slave got interrupt.
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* @client_data: callback related data
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* Context: can not sleep
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*/
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int tegra_spi_slave_register_callback(struct spi_device *spi,
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spi_callback func_ready, spi_callback func_isr,
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void *client_data);
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#endif /* _LINUX_SPI_TEGRA_H */
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