// SPDX-License-Identifier: GPL-2.0 /* * Microchip CoreI2C I2C controller driver * * Copyright (c) 2018-2022 Microchip Corporation. All rights reserved. * * Author: Daire McNamara <[email protected]> * Author: Conor Dooley <[email protected]> */ #include <linux/clk.h> #include <linux/clkdev.h> #include <linux/err.h> #include <linux/i2c.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/platform_device.h> #define CORE_I2C_CTRL … #define CTRL_CR0 … #define CTRL_CR1 … #define CTRL_AA … #define CTRL_SI … #define CTRL_STO … #define CTRL_STA … #define CTRL_ENS1 … #define CTRL_CR2 … #define STATUS_BUS_ERROR … #define STATUS_M_START_SENT … #define STATUS_M_REPEATED_START_SENT … #define STATUS_M_SLAW_ACK … #define STATUS_M_SLAW_NACK … #define STATUS_M_TX_DATA_ACK … #define STATUS_M_TX_DATA_NACK … #define STATUS_M_ARB_LOST … #define STATUS_M_SLAR_ACK … #define STATUS_M_SLAR_NACK … #define STATUS_M_RX_DATA_ACKED … #define STATUS_M_RX_DATA_NACKED … #define STATUS_S_SLAW_ACKED … #define STATUS_S_ARB_LOST_SLAW_ACKED … #define STATUS_S_GENERAL_CALL_ACKED … #define STATUS_S_ARB_LOST_GENERAL_CALL_ACKED … #define STATUS_S_RX_DATA_ACKED … #define STATUS_S_RX_DATA_NACKED … #define STATUS_S_GENERAL_CALL_RX_DATA_ACKED … #define STATUS_S_GENERAL_CALL_RX_DATA_NACKED … #define STATUS_S_RX_STOP … #define STATUS_S_SLAR_ACKED … #define STATUS_S_ARB_LOST_SLAR_ACKED … #define STATUS_S_TX_DATA_ACK … #define STATUS_S_TX_DATA_NACK … #define STATUS_LAST_DATA_ACK … #define STATUS_M_SMB_MASTER_RESET … #define STATUS_S_SCL_LOW_TIMEOUT … #define STATUS_NO_STATE_INFO … #define CORE_I2C_STATUS … #define CORE_I2C_DATA … #define WRITE_BIT … #define READ_BIT … #define SLAVE_ADDR_SHIFT … #define CORE_I2C_SLAVE0_ADDR … #define GENERAL_CALL_BIT … #define CORE_I2C_SMBUS … #define SMBALERT_INT_ENB … #define SMBSUS_INT_ENB … #define SMBUS_ENB … #define SMBALERT_NI_STATUS … #define SMBALERT_NO_CTRL … #define SMBSUS_NI_STATUS … #define SMBSUS_NO_CTRL … #define SMBUS_RESET … #define CORE_I2C_FREQ … #define CORE_I2C_GLITCHREG … #define CORE_I2C_SLAVE1_ADDR … #define PCLK_DIV_960 … #define PCLK_DIV_256 … #define PCLK_DIV_224 … #define PCLK_DIV_192 … #define PCLK_DIV_160 … #define PCLK_DIV_120 … #define PCLK_DIV_60 … #define BCLK_DIV_8 … #define CLK_MASK … /** * struct mchp_corei2c_dev - Microchip CoreI2C device private data * * @base: pointer to register struct * @dev: device reference * @i2c_clk: clock reference for i2c input clock * @buf: pointer to msg buffer for easier use * @msg_complete: xfer completion object * @adapter: core i2c abstraction * @msg_err: error code for completed message * @bus_clk_rate: current i2c bus clock rate * @isr_status: cached copy of local ISR status * @msg_len: number of bytes transferred in msg * @addr: address of the current slave */ struct mchp_corei2c_dev { … }; static void mchp_corei2c_core_disable(struct mchp_corei2c_dev *idev) { … } static void mchp_corei2c_core_enable(struct mchp_corei2c_dev *idev) { … } static void mchp_corei2c_reset(struct mchp_corei2c_dev *idev) { … } static inline void mchp_corei2c_stop(struct mchp_corei2c_dev *idev) { … } static inline int mchp_corei2c_set_divisor(u32 rate, struct mchp_corei2c_dev *idev) { … } static int mchp_corei2c_init(struct mchp_corei2c_dev *idev) { … } static void mchp_corei2c_empty_rx(struct mchp_corei2c_dev *idev) { … } static int mchp_corei2c_fill_tx(struct mchp_corei2c_dev *idev) { … } static irqreturn_t mchp_corei2c_handle_isr(struct mchp_corei2c_dev *idev) { … } static irqreturn_t mchp_corei2c_isr(int irq, void *_dev) { … } static int mchp_corei2c_xfer_msg(struct mchp_corei2c_dev *idev, struct i2c_msg *msg) { … } static int mchp_corei2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) { … } static u32 mchp_corei2c_func(struct i2c_adapter *adap) { … } static const struct i2c_algorithm mchp_corei2c_algo = …; static int mchp_corei2c_probe(struct platform_device *pdev) { … } static void mchp_corei2c_remove(struct platform_device *pdev) { … } static const struct of_device_id mchp_corei2c_of_match[] = …; MODULE_DEVICE_TABLE(of, mchp_corei2c_of_match); static struct platform_driver mchp_corei2c_driver = …; module_platform_driver(…) …; MODULE_DESCRIPTION(…) …; MODULE_AUTHOR(…) …; MODULE_AUTHOR(…) …; MODULE_LICENSE(…) …;
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