// SPDX-License-Identifier: GPL-2.0-only /* * Loongson-2K/Loongson LS7A I2C controller mode driver * * Copyright (C) 2013 Loongson Technology Corporation Limited. * Copyright (C) 2014-2017 Lemote, Inc. * Copyright (C) 2018-2022 Loongson Technology Corporation Limited. * * Originally written by liushaozong * Rewritten for mainline by Binbin Zhou <[email protected]> */ #include <linux/bits.h> #include <linux/completion.h> #include <linux/device.h> #include <linux/iopoll.h> #include <linux/i2c.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/pm_runtime.h> #include <linux/platform_device.h> #include <linux/property.h> #include <linux/units.h> /* I2C Registers */ #define I2C_LS2X_PRER … #define I2C_LS2X_CTR … #define I2C_LS2X_TXR … #define I2C_LS2X_RXR … #define I2C_LS2X_CR … #define I2C_LS2X_SR … /* Command Control Register Bit */ #define LS2X_CR_START … #define LS2X_CR_STOP … #define LS2X_CR_READ … #define LS2X_CR_WRITE … #define LS2X_CR_ACK … #define LS2X_CR_IACK … /* State Register Bit */ #define LS2X_SR_NOACK … #define LS2X_SR_BUSY … #define LS2X_SR_AL … #define LS2X_SR_TIP … #define LS2X_SR_IF … /* Control Register Bit */ #define LS2X_CTR_EN … #define LS2X_CTR_IEN … #define LS2X_CTR_MST … #define CTR_FREQ_MASK … #define CTR_READY_MASK … /* The PCLK frequency from LPB */ #define LS2X_I2C_PCLK_FREQ … /* The default bus frequency, which is an empirical value */ #define LS2X_I2C_FREQ_STD … struct ls2x_i2c_priv { … }; /* * Interrupt service routine. * This gets called whenever an I2C interrupt occurs. */ static irqreturn_t ls2x_i2c_isr(int this_irq, void *dev_id) { … } /* * The ls2x i2c controller supports standard mode and fast mode, so the * maximum bus frequency is '400kHz'. * The bus frequency is set to the empirical value of '33KHz' by default, * but it can also be taken from ACPI or FDT for compatibility with more * devices. */ static void ls2x_i2c_adjust_bus_speed(struct ls2x_i2c_priv *priv) { … } static void ls2x_i2c_init(struct ls2x_i2c_priv *priv) { … } static int ls2x_i2c_xfer_byte(struct ls2x_i2c_priv *priv, u8 txdata, u8 *rxdatap) { … } static int ls2x_i2c_send_byte(struct ls2x_i2c_priv *priv, u8 txdata) { … } static int ls2x_i2c_stop(struct ls2x_i2c_priv *priv) { … } static int ls2x_i2c_start(struct ls2x_i2c_priv *priv, struct i2c_msg *msgs) { … } static int ls2x_i2c_rx(struct ls2x_i2c_priv *priv, struct i2c_msg *msg) { … } static int ls2x_i2c_tx(struct ls2x_i2c_priv *priv, struct i2c_msg *msg) { … } static int ls2x_i2c_xfer_one(struct ls2x_i2c_priv *priv, struct i2c_msg *msg, bool stop) { … } static int ls2x_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) { … } static unsigned int ls2x_i2c_func(struct i2c_adapter *adap) { … } static const struct i2c_algorithm ls2x_i2c_algo = …; static int ls2x_i2c_probe(struct platform_device *pdev) { … } static int ls2x_i2c_suspend(struct device *dev) { … } static int ls2x_i2c_resume(struct device *dev) { … } static DEFINE_RUNTIME_DEV_PM_OPS(ls2x_i2c_pm_ops, ls2x_i2c_suspend, ls2x_i2c_resume, NULL); static const struct of_device_id ls2x_i2c_id_table[] = …; MODULE_DEVICE_TABLE(of, ls2x_i2c_id_table); static const struct acpi_device_id ls2x_i2c_acpi_match[] = …; MODULE_DEVICE_TABLE(acpi, ls2x_i2c_acpi_match); static struct platform_driver ls2x_i2c_driver = …; module_platform_driver(…) …; MODULE_DESCRIPTION(…) …; MODULE_AUTHOR(…) …; MODULE_LICENSE(…) …;
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