// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 /* * Mellanox i2c driver * * Copyright (C) 2016-2020 Mellanox Technologies */ #include <linux/delay.h> #include <linux/i2c.h> #include <linux/init.h> #include <linux/io.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/platform_data/mlxreg.h> #include <linux/platform_device.h> #include <linux/regmap.h> /* General defines */ #define MLXPLAT_CPLD_LPC_I2C_BASE_ADDR … #define MLXCPLD_I2C_DEVICE_NAME … #define MLXCPLD_I2C_VALID_FLAG … #define MLXCPLD_I2C_BUS_NUM … #define MLXCPLD_I2C_DATA_REG_SZ … #define MLXCPLD_I2C_DATA_SZ_BIT … #define MLXCPLD_I2C_DATA_EXT2_SZ_BIT … #define MLXCPLD_I2C_DATA_SZ_MASK … #define MLXCPLD_I2C_SMBUS_BLK_BIT … #define MLXCPLD_I2C_MAX_ADDR_LEN … #define MLXCPLD_I2C_RETR_NUM … #define MLXCPLD_I2C_XFER_TO … #define MLXCPLD_I2C_POLL_TIME … /* LPC I2C registers */ #define MLXCPLD_LPCI2C_CPBLTY_REG … #define MLXCPLD_LPCI2C_CTRL_REG … #define MLXCPLD_LPCI2C_HALF_CYC_REG … #define MLXCPLD_LPCI2C_I2C_HOLD_REG … #define MLXCPLD_LPCI2C_CMD_REG … #define MLXCPLD_LPCI2C_NUM_DAT_REG … #define MLXCPLD_LPCI2C_NUM_ADDR_REG … #define MLXCPLD_LPCI2C_STATUS_REG … #define MLXCPLD_LPCI2C_DATA_REG … /* LPC I2C masks and parameters */ #define MLXCPLD_LPCI2C_RST_SEL_MASK … #define MLXCPLD_LPCI2C_TRANS_END … #define MLXCPLD_LPCI2C_STATUS_NACK … #define MLXCPLD_LPCI2C_NO_IND … #define MLXCPLD_LPCI2C_ACK_IND … #define MLXCPLD_LPCI2C_NACK_IND … #define MLXCPLD_I2C_FREQ_1000KHZ_SET … #define MLXCPLD_I2C_FREQ_400KHZ_SET … #define MLXCPLD_I2C_FREQ_100KHZ_SET … enum mlxcpld_i2c_frequency { … }; struct mlxcpld_i2c_curr_xfer { … }; struct mlxcpld_i2c_priv { … }; static void mlxcpld_i2c_lpc_write_buf(u8 *data, u8 len, u32 addr) { … } static void mlxcpld_i2c_lpc_read_buf(u8 *data, u8 len, u32 addr) { … } static void mlxcpld_i2c_read_comm(struct mlxcpld_i2c_priv *priv, u8 offs, u8 *data, u8 datalen) { … } static void mlxcpld_i2c_write_comm(struct mlxcpld_i2c_priv *priv, u8 offs, u8 *data, u8 datalen) { … } /* * Check validity of received i2c messages parameters. * Returns 0 if OK, other - in case of invalid parameters. */ static int mlxcpld_i2c_check_msg_params(struct mlxcpld_i2c_priv *priv, struct i2c_msg *msgs, int num) { … } /* * Check if transfer is completed and status of operation. * Returns 0 - transfer completed (both ACK or NACK), * negative - transfer isn't finished. */ static int mlxcpld_i2c_check_status(struct mlxcpld_i2c_priv *priv, int *status) { … } static void mlxcpld_i2c_set_transf_data(struct mlxcpld_i2c_priv *priv, struct i2c_msg *msgs, int num, u8 comm_len) { … } /* Reset CPLD LPCI2C block */ static void mlxcpld_i2c_reset(struct mlxcpld_i2c_priv *priv) { … } /* Make sure the CPLD is ready to start transmitting. */ static int mlxcpld_i2c_check_busy(struct mlxcpld_i2c_priv *priv) { … } static int mlxcpld_i2c_wait_for_free(struct mlxcpld_i2c_priv *priv) { … } /* * Wait for transfer to complete. * It puts current process to sleep until we get interrupt or timeout expires. * Returns the number of transferred or read bytes or error (<0). */ static int mlxcpld_i2c_wait_for_tc(struct mlxcpld_i2c_priv *priv) { … } static void mlxcpld_i2c_xfer_msg(struct mlxcpld_i2c_priv *priv) { … } /* * Generic lpc-i2c transfer. * Returns the number of processed messages or error (<0). */ static int mlxcpld_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) { … } static u32 mlxcpld_i2c_func(struct i2c_adapter *adap) { … } static const struct i2c_algorithm mlxcpld_i2c_algo = …; static const struct i2c_adapter_quirks mlxcpld_i2c_quirks = …; static const struct i2c_adapter_quirks mlxcpld_i2c_quirks_ext = …; static const struct i2c_adapter_quirks mlxcpld_i2c_quirks_ext2 = …; static struct i2c_adapter mlxcpld_i2c_adapter = …; static int mlxcpld_i2c_set_frequency(struct mlxcpld_i2c_priv *priv, struct mlxreg_core_hotplug_platform_data *pdata) { … } static int mlxcpld_i2c_probe(struct platform_device *pdev) { … } static void mlxcpld_i2c_remove(struct platform_device *pdev) { … } static struct platform_driver mlxcpld_i2c_driver = …; module_platform_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …; MODULE_ALIAS(…) …;
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