// SPDX-License-Identifier: GPL-2.0-only /* * cobalt I2C functions * * Derived from cx18-i2c.c * * Copyright 2012-2015 Cisco Systems, Inc. and/or its affiliates. * All rights reserved. */ #include "cobalt-driver.h" #include "cobalt-i2c.h" struct cobalt_i2c_regs { … }; /* CTR[7:0] - Control register */ /* I2C Core enable bit */ #define M00018_CTR_BITMAP_EN_MSK … /* I2C Core interrupt enable bit */ #define M00018_CTR_BITMAP_IEN_MSK … /* CR[7:0] - Command register */ /* I2C start condition */ #define M00018_CR_BITMAP_STA_MSK … /* I2C stop condition */ #define M00018_CR_BITMAP_STO_MSK … /* I2C read from slave */ #define M00018_CR_BITMAP_RD_MSK … /* I2C write to slave */ #define M00018_CR_BITMAP_WR_MSK … /* I2C ack */ #define M00018_CR_BITMAP_ACK_MSK … /* I2C Interrupt ack */ #define M00018_CR_BITMAP_IACK_MSK … /* SR[7:0] - Status register */ /* Receive acknowledge from slave */ #define M00018_SR_BITMAP_RXACK_MSK … /* Busy, I2C bus busy (as defined by start / stop bits) */ #define M00018_SR_BITMAP_BUSY_MSK … /* Arbitration lost - core lost arbitration */ #define M00018_SR_BITMAP_AL_MSK … /* Transfer in progress */ #define M00018_SR_BITMAP_TIP_MSK … /* Interrupt flag */ #define M00018_SR_BITMAP_IF_MSK … /* Frequency, in Hz */ #define I2C_FREQUENCY … #define ALT_CPU_FREQ … static struct cobalt_i2c_regs __iomem * cobalt_i2c_regs(struct cobalt *cobalt, unsigned idx) { … } /* Do low-level i2c byte transfer. * Returns -1 in case of an error or 0 otherwise. */ static int cobalt_tx_bytes(struct cobalt_i2c_regs __iomem *regs, struct i2c_adapter *adap, bool start, bool stop, u8 *data, u16 len) { … } /* Do low-level i2c byte read. * Returns -1 in case of an error or 0 otherwise. */ static int cobalt_rx_bytes(struct cobalt_i2c_regs __iomem *regs, struct i2c_adapter *adap, bool start, bool stop, u8 *data, u16 len) { … } /* Generate stop condition on i2c bus. * The m00018 stop isn't doing the right thing (wrong timing). * So instead send a start condition, 8 zeroes and a stop condition. */ static int cobalt_stop(struct cobalt_i2c_regs __iomem *regs, struct i2c_adapter *adap) { … } static int cobalt_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num) { … } static u32 cobalt_func(struct i2c_adapter *adap) { … } /* template for i2c-bit-algo */ static const struct i2c_adapter cobalt_i2c_adap_template = …; static const struct i2c_algorithm cobalt_algo = …; /* init + register i2c algo-bit adapter */ int cobalt_i2c_init(struct cobalt *cobalt) { … } void cobalt_i2c_exit(struct cobalt *cobalt) { … }
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