// SPDX-License-Identifier: GPL-2.0 // // Driver for AT91 USART Controllers as SPI // // Copyright (C) 2018 Microchip Technology Inc. // // Author: Radu Pirea <[email protected]> #include <linux/clk.h> #include <linux/delay.h> #include <linux/dmaengine.h> #include <linux/dma-direction.h> #include <linux/interrupt.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/gpio/consumer.h> #include <linux/pinctrl/consumer.h> #include <linux/platform_device.h> #include <linux/pm_runtime.h> #include <linux/spi/spi.h> #define US_CR … #define US_MR … #define US_IER … #define US_IDR … #define US_CSR … #define US_RHR … #define US_THR … #define US_BRGR … #define US_VERSION … #define US_CR_RSTRX … #define US_CR_RSTTX … #define US_CR_RXEN … #define US_CR_RXDIS … #define US_CR_TXEN … #define US_CR_TXDIS … #define US_MR_SPI_HOST … #define US_MR_CHRL … #define US_MR_CPHA … #define US_MR_CPOL … #define US_MR_CLKO … #define US_MR_WRDBT … #define US_MR_LOOP … #define US_IR_RXRDY … #define US_IR_TXRDY … #define US_IR_OVRE … #define US_BRGR_SIZE … #define US_MIN_CLK_DIV … #define US_MAX_CLK_DIV … #define US_RESET … #define US_DISABLE … #define US_ENABLE … #define US_OVRE_RXRDY_IRQS … #define US_INIT … #define US_DMA_MIN_BYTES … #define US_DMA_TIMEOUT … /* Register access macros */ #define at91_usart_spi_readl(port, reg) … #define at91_usart_spi_writel(port, reg, value) … #define at91_usart_spi_readb(port, reg) … #define at91_usart_spi_writeb(port, reg, value) … struct at91_usart_spi { … }; static void dma_callback(void *data) { … } static bool at91_usart_spi_can_dma(struct spi_controller *ctrl, struct spi_device *spi, struct spi_transfer *xfer) { … } static int at91_usart_spi_configure_dma(struct spi_controller *ctlr, struct at91_usart_spi *aus) { … } static void at91_usart_spi_release_dma(struct spi_controller *ctlr) { … } static void at91_usart_spi_stop_dma(struct spi_controller *ctlr) { … } static int at91_usart_spi_dma_transfer(struct spi_controller *ctlr, struct spi_transfer *xfer) { … } static unsigned long at91_usart_spi_dma_timeout(struct at91_usart_spi *aus) { … } static inline u32 at91_usart_spi_tx_ready(struct at91_usart_spi *aus) { … } static inline u32 at91_usart_spi_rx_ready(struct at91_usart_spi *aus) { … } static inline u32 at91_usart_spi_check_overrun(struct at91_usart_spi *aus) { … } static inline u32 at91_usart_spi_read_status(struct at91_usart_spi *aus) { … } static inline void at91_usart_spi_tx(struct at91_usart_spi *aus) { … } static inline void at91_usart_spi_rx(struct at91_usart_spi *aus) { … } static inline void at91_usart_spi_set_xfer_speed(struct at91_usart_spi *aus, struct spi_transfer *xfer) { … } static irqreturn_t at91_usart_spi_interrupt(int irq, void *dev_id) { … } static int at91_usart_spi_setup(struct spi_device *spi) { … } static int at91_usart_spi_transfer_one(struct spi_controller *ctlr, struct spi_device *spi, struct spi_transfer *xfer) { … } static int at91_usart_spi_prepare_message(struct spi_controller *ctlr, struct spi_message *message) { … } static int at91_usart_spi_unprepare_message(struct spi_controller *ctlr, struct spi_message *message) { … } static void at91_usart_spi_cleanup(struct spi_device *spi) { … } static void at91_usart_spi_init(struct at91_usart_spi *aus) { … } static int at91_usart_gpio_setup(struct platform_device *pdev) { … } static int at91_usart_spi_probe(struct platform_device *pdev) { … } __maybe_unused static int at91_usart_spi_runtime_suspend(struct device *dev) { … } __maybe_unused static int at91_usart_spi_runtime_resume(struct device *dev) { … } __maybe_unused static int at91_usart_spi_suspend(struct device *dev) { … } __maybe_unused static int at91_usart_spi_resume(struct device *dev) { … } static void at91_usart_spi_remove(struct platform_device *pdev) { … } static const struct dev_pm_ops at91_usart_spi_pm_ops = …; static struct platform_driver at91_usart_spi_driver = …; module_platform_driver(…) …; MODULE_DESCRIPTION(…) …; MODULE_AUTHOR(…) …; MODULE_LICENSE(…) …; MODULE_ALIAS(…) …;
Codebase Browser
linux