// SPDX-License-Identifier: GPL-2.0-only /* * Copyright Intel Corporation (C) 2017. * * Based on the i2c-axxia.c driver. */ #include <linux/clk.h> #include <linux/clkdev.h> #include <linux/err.h> #include <linux/i2c.h> #include <linux/iopoll.h> #include <linux/interrupt.h> #include <linux/module.h> #include <linux/io.h> #include <linux/kernel.h> #include <linux/platform_device.h> #define ALTR_I2C_TFR_CMD … #define ALTR_I2C_TFR_CMD_STA … #define ALTR_I2C_TFR_CMD_STO … #define ALTR_I2C_TFR_CMD_RW_D … #define ALTR_I2C_RX_DATA … #define ALTR_I2C_CTRL … #define ALTR_I2C_CTRL_RXT_SHFT … #define ALTR_I2C_CTRL_TCT_SHFT … #define ALTR_I2C_CTRL_BSPEED … #define ALTR_I2C_CTRL_EN … #define ALTR_I2C_ISER … #define ALTR_I2C_ISER_RXOF_EN … #define ALTR_I2C_ISER_ARB_EN … #define ALTR_I2C_ISER_NACK_EN … #define ALTR_I2C_ISER_RXRDY_EN … #define ALTR_I2C_ISER_TXRDY_EN … #define ALTR_I2C_ISR … #define ALTR_I2C_ISR_RXOF … #define ALTR_I2C_ISR_ARB … #define ALTR_I2C_ISR_NACK … #define ALTR_I2C_ISR_RXRDY … #define ALTR_I2C_ISR_TXRDY … #define ALTR_I2C_STATUS … #define ALTR_I2C_STAT_CORE … #define ALTR_I2C_TC_FIFO_LVL … #define ALTR_I2C_RX_FIFO_LVL … #define ALTR_I2C_SCL_LOW … #define ALTR_I2C_SCL_HIGH … #define ALTR_I2C_SDA_HOLD … #define ALTR_I2C_ALL_IRQ … #define ALTR_I2C_THRESHOLD … #define ALTR_I2C_DFLT_FIFO_SZ … #define ALTR_I2C_TIMEOUT … #define ALTR_I2C_XFER_TIMEOUT … /** * struct altr_i2c_dev - I2C device context * @base: pointer to register struct * @msg: pointer to current message * @msg_len: number of bytes transferred in msg * @msg_err: error code for completed message * @msg_complete: xfer completion object * @dev: device reference * @adapter: core i2c abstraction * @i2c_clk: clock reference for i2c input clock * @bus_clk_rate: current i2c bus clock rate * @buf: ptr to msg buffer for easier use. * @fifo_size: size of the FIFO passed in. * @isr_mask: cached copy of local ISR enables. * @isr_status: cached copy of local ISR status. * @isr_mutex: mutex for IRQ thread. */ struct altr_i2c_dev { … }; static void altr_i2c_int_enable(struct altr_i2c_dev *idev, u32 mask, bool enable) { … } static void altr_i2c_int_clear(struct altr_i2c_dev *idev, u32 mask) { … } static void altr_i2c_core_disable(struct altr_i2c_dev *idev) { … } static void altr_i2c_core_enable(struct altr_i2c_dev *idev) { … } static void altr_i2c_reset(struct altr_i2c_dev *idev) { … } static inline void altr_i2c_stop(struct altr_i2c_dev *idev) { … } static void altr_i2c_init(struct altr_i2c_dev *idev) { … } /* * altr_i2c_transfer - On the last byte to be transmitted, send * a Stop bit on the last byte. */ static void altr_i2c_transfer(struct altr_i2c_dev *idev, u32 data) { … } /* * altr_i2c_empty_rx_fifo - Fetch data from RX FIFO until end of * transfer. Send a Stop bit on the last byte. */ static void altr_i2c_empty_rx_fifo(struct altr_i2c_dev *idev) { … } /* * altr_i2c_fill_tx_fifo - Fill TX FIFO from current message buffer. */ static int altr_i2c_fill_tx_fifo(struct altr_i2c_dev *idev) { … } static irqreturn_t altr_i2c_isr_quick(int irq, void *_dev) { … } static irqreturn_t altr_i2c_isr(int irq, void *_dev) { … } static int altr_i2c_xfer_msg(struct altr_i2c_dev *idev, struct i2c_msg *msg) { … } static int altr_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) { … } static u32 altr_i2c_func(struct i2c_adapter *adap) { … } static const struct i2c_algorithm altr_i2c_algo = …; static int altr_i2c_probe(struct platform_device *pdev) { … } static void altr_i2c_remove(struct platform_device *pdev) { … } /* Match table for of_platform binding */ static const struct of_device_id altr_i2c_of_match[] = …; MODULE_DEVICE_TABLE(of, altr_i2c_of_match); static struct platform_driver altr_i2c_driver = …; module_platform_driver(…) …; MODULE_DESCRIPTION(…) …; MODULE_AUTHOR(…) …; MODULE_LICENSE(…) …;
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