// SPDX-License-Identifier: GPL-2.0-only /* * I2C bus driver for Amlogic Meson SoCs * * Copyright (C) 2014 Beniamino Galvani <[email protected]> */ #include <linux/bitfield.h> #include <linux/clk.h> #include <linux/completion.h> #include <linux/i2c.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/iopoll.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/types.h> /* Meson I2C register map */ #define REG_CTRL … #define REG_SLAVE_ADDR … #define REG_TOK_LIST0 … #define REG_TOK_LIST1 … #define REG_TOK_WDATA0 … #define REG_TOK_WDATA1 … #define REG_TOK_RDATA0 … #define REG_TOK_RDATA1 … /* Control register fields */ #define REG_CTRL_START … #define REG_CTRL_ACK_IGNORE … #define REG_CTRL_STATUS … #define REG_CTRL_ERROR … #define REG_CTRL_CLKDIV_SHIFT … #define REG_CTRL_CLKDIV_MASK … #define REG_CTRL_CLKDIVEXT_SHIFT … #define REG_CTRL_CLKDIVEXT_MASK … #define REG_SLV_ADDR_MASK … #define REG_SLV_SDA_FILTER_MASK … #define REG_SLV_SCL_FILTER_MASK … #define REG_SLV_SCL_LOW_SHIFT … #define REG_SLV_SCL_LOW_MASK … #define REG_SLV_SCL_LOW_EN … #define I2C_TIMEOUT_MS … #define FILTER_DELAY … enum { … }; enum { … }; /** * struct meson_i2c - Meson I2C device private data * * @adap: I2C adapter instance * @dev: Pointer to device structure * @regs: Base address of the device memory mapped registers * @clk: Pointer to clock structure * @msg: Pointer to the current I2C message * @state: Current state in the driver state machine * @last: Flag set for the last message in the transfer * @count: Number of bytes to be sent/received in current transfer * @pos: Current position in the send/receive buffer * @error: Flag set when an error is received * @lock: To avoid race conditions between irq handler and xfer code * @done: Completion used to wait for transfer termination * @tokens: Sequence of tokens to be written to the device * @num_tokens: Number of tokens * @data: Pointer to the controller's platform data */ struct meson_i2c { … }; struct meson_i2c_data { … }; static void meson_i2c_set_mask(struct meson_i2c *i2c, int reg, u32 mask, u32 val) { … } static void meson_i2c_reset_tokens(struct meson_i2c *i2c) { … } static void meson_i2c_add_token(struct meson_i2c *i2c, int token) { … } static void meson_gxbb_axg_i2c_set_clk_div(struct meson_i2c *i2c, unsigned int freq) { … } static void meson6_i2c_set_clk_div(struct meson_i2c *i2c, unsigned int freq) { … } static void meson_i2c_get_data(struct meson_i2c *i2c, char *buf, int len) { … } static void meson_i2c_put_data(struct meson_i2c *i2c, char *buf, int len) { … } static void meson_i2c_prepare_xfer(struct meson_i2c *i2c) { … } static void meson_i2c_transfer_complete(struct meson_i2c *i2c, u32 ctrl) { … } static irqreturn_t meson_i2c_irq(int irqno, void *dev_id) { … } static void meson_i2c_do_start(struct meson_i2c *i2c, struct i2c_msg *msg) { … } static int meson_i2c_xfer_msg(struct meson_i2c *i2c, struct i2c_msg *msg, int last, bool atomic) { … } static int meson_i2c_xfer_messages(struct i2c_adapter *adap, struct i2c_msg *msgs, int num, bool atomic) { … } static int meson_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) { … } static int meson_i2c_xfer_atomic(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) { … } static u32 meson_i2c_func(struct i2c_adapter *adap) { … } static const struct i2c_algorithm meson_i2c_algorithm = …; static int meson_i2c_probe(struct platform_device *pdev) { … } static void meson_i2c_remove(struct platform_device *pdev) { … } static const struct meson_i2c_data i2c_meson6_data = …; static const struct meson_i2c_data i2c_gxbb_data = …; static const struct meson_i2c_data i2c_axg_data = …; static const struct of_device_id meson_i2c_match[] = …; MODULE_DEVICE_TABLE(of, meson_i2c_match); static struct platform_driver meson_i2c_driver = …; module_platform_driver(…) …; MODULE_DESCRIPTION(…) …; MODULE_AUTHOR(…) …; MODULE_LICENSE(…) …;
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