// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (c) 2008-2014 STMicroelectronics Limited * * Author: Angus Clark <[email protected]> * Patrice Chotard <[email protected]> * Lee Jones <[email protected]> * * SPI host mode controller driver, used in STMicroelectronics devices. */ #include <linux/clk.h> #include <linux/delay.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/module.h> #include <linux/pinctrl/consumer.h> #include <linux/platform_device.h> #include <linux/of.h> #include <linux/of_irq.h> #include <linux/pm_runtime.h> #include <linux/spi/spi.h> #include <linux/spi/spi_bitbang.h> /* SSC registers */ #define SSC_BRG … #define SSC_TBUF … #define SSC_RBUF … #define SSC_CTL … #define SSC_IEN … #define SSC_I2C … /* SSC Control */ #define SSC_CTL_DATA_WIDTH_9 … #define SSC_CTL_DATA_WIDTH_MSK … #define SSC_CTL_BM … #define SSC_CTL_HB … #define SSC_CTL_PH … #define SSC_CTL_PO … #define SSC_CTL_SR … #define SSC_CTL_MS … #define SSC_CTL_EN … #define SSC_CTL_LPB … #define SSC_CTL_EN_TX_FIFO … #define SSC_CTL_EN_RX_FIFO … #define SSC_CTL_EN_CLST_RX … /* SSC Interrupt Enable */ #define SSC_IEN_TEEN … #define FIFO_SIZE … struct spi_st { … }; /* Load the TX FIFO */ static void ssc_write_tx_fifo(struct spi_st *spi_st) { … } /* Read the RX FIFO */ static void ssc_read_rx_fifo(struct spi_st *spi_st) { … } static int spi_st_transfer_one(struct spi_controller *host, struct spi_device *spi, struct spi_transfer *t) { … } /* the spi->mode bits understood by this driver: */ #define MODEBITS … static int spi_st_setup(struct spi_device *spi) { … } /* Interrupt fired when TX shift register becomes empty */ static irqreturn_t spi_st_irq(int irq, void *dev_id) { … } static int spi_st_probe(struct platform_device *pdev) { … } static void spi_st_remove(struct platform_device *pdev) { … } #ifdef CONFIG_PM static int spi_st_runtime_suspend(struct device *dev) { … } static int spi_st_runtime_resume(struct device *dev) { … } #endif #ifdef CONFIG_PM_SLEEP static int spi_st_suspend(struct device *dev) { … } static int spi_st_resume(struct device *dev) { … } #endif static const struct dev_pm_ops spi_st_pm = …; static const struct of_device_id stm_spi_match[] = …; MODULE_DEVICE_TABLE(of, stm_spi_match); static struct platform_driver spi_st_driver = …; module_platform_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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