// SPDX-License-Identifier: GPL-2.0-only // Copyright (C) 2013 Broadcom Corporation #include <linux/device.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/sched.h> #include <linux/i2c.h> #include <linux/interrupt.h> #include <linux/platform_device.h> #include <linux/clk.h> #include <linux/io.h> #include <linux/slab.h> /* Hardware register offsets and field defintions */ #define CS_OFFSET … #define CS_ACK_SHIFT … #define CS_ACK_MASK … #define CS_ACK_CMD_GEN_START … #define CS_ACK_CMD_GEN_RESTART … #define CS_CMD_SHIFT … #define CS_CMD_CMD_NO_ACTION … #define CS_CMD_CMD_START_RESTART … #define CS_CMD_CMD_STOP … #define CS_EN_SHIFT … #define CS_EN_CMD_ENABLE_BSC … #define TIM_OFFSET … #define TIM_PRESCALE_SHIFT … #define TIM_P_SHIFT … #define TIM_NO_DIV_SHIFT … #define TIM_DIV_SHIFT … #define DAT_OFFSET … #define TOUT_OFFSET … #define TXFCR_OFFSET … #define TXFCR_FIFO_FLUSH_MASK … #define TXFCR_FIFO_EN_MASK … #define IER_OFFSET … #define IER_READ_COMPLETE_INT_MASK … #define IER_I2C_INT_EN_MASK … #define IER_FIFO_INT_EN_MASK … #define IER_NOACK_EN_MASK … #define ISR_OFFSET … #define ISR_RESERVED_MASK … #define ISR_CMDBUSY_MASK … #define ISR_READ_COMPLETE_MASK … #define ISR_SES_DONE_MASK … #define ISR_ERR_MASK … #define ISR_TXFIFOEMPTY_MASK … #define ISR_NOACK_MASK … #define CLKEN_OFFSET … #define CLKEN_AUTOSENSE_OFF_MASK … #define CLKEN_M_SHIFT … #define CLKEN_N_SHIFT … #define CLKEN_CLKEN_MASK … #define FIFO_STATUS_OFFSET … #define FIFO_STATUS_RXFIFO_EMPTY_MASK … #define FIFO_STATUS_TXFIFO_EMPTY_MASK … #define HSTIM_OFFSET … #define HSTIM_HS_MODE_MASK … #define HSTIM_HS_HOLD_SHIFT … #define HSTIM_HS_HIGH_PHASE_SHIFT … #define HSTIM_HS_SETUP_SHIFT … #define PADCTL_OFFSET … #define PADCTL_PAD_OUT_EN_MASK … #define RXFCR_OFFSET … #define RXFCR_NACK_EN_SHIFT … #define RXFCR_READ_COUNT_SHIFT … #define RXFIFORDOUT_OFFSET … /* Locally used constants */ #define MAX_RX_FIFO_SIZE … #define MAX_TX_FIFO_SIZE … #define STD_EXT_CLK_FREQ … #define HS_EXT_CLK_FREQ … #define CONTROLLER_CODE … #define I2C_TIMEOUT … /* Operations that can be commanded to the controller */ enum bcm_kona_cmd_t { … }; enum bus_speed_index { … }; enum hs_bus_speed_index { … }; /* Internal divider settings for standard mode, fast mode and fast mode plus */ struct bus_speed_cfg { … }; /* Internal divider settings for high-speed mode */ struct hs_bus_speed_cfg { … }; static const struct bus_speed_cfg std_cfg_table[] = …; static const struct hs_bus_speed_cfg hs_cfg_table[] = …; struct bcm_kona_i2c_dev { … }; static void bcm_kona_i2c_send_cmd_to_ctrl(struct bcm_kona_i2c_dev *dev, enum bcm_kona_cmd_t cmd) { … } static void bcm_kona_i2c_enable_clock(struct bcm_kona_i2c_dev *dev) { … } static void bcm_kona_i2c_disable_clock(struct bcm_kona_i2c_dev *dev) { … } static irqreturn_t bcm_kona_i2c_isr(int irq, void *devid) { … } /* Wait for ISR_CMDBUSY_MASK to go low before writing to CS, DAT, or RCD */ static int bcm_kona_i2c_wait_if_busy(struct bcm_kona_i2c_dev *dev) { … } /* Send command to I2C bus */ static int bcm_kona_send_i2c_cmd(struct bcm_kona_i2c_dev *dev, enum bcm_kona_cmd_t cmd) { … } /* Read a single RX FIFO worth of data from the i2c bus */ static int bcm_kona_i2c_read_fifo_single(struct bcm_kona_i2c_dev *dev, uint8_t *buf, unsigned int len, unsigned int last_byte_nak) { … } /* Read any amount of data using the RX FIFO from the i2c bus */ static int bcm_kona_i2c_read_fifo(struct bcm_kona_i2c_dev *dev, struct i2c_msg *msg) { … } /* Write a single byte of data to the i2c bus */ static int bcm_kona_i2c_write_byte(struct bcm_kona_i2c_dev *dev, uint8_t data, unsigned int nak_expected) { … } /* Write a single TX FIFO worth of data to the i2c bus */ static int bcm_kona_i2c_write_fifo_single(struct bcm_kona_i2c_dev *dev, uint8_t *buf, unsigned int len) { … } /* Write any amount of data using TX FIFO to the i2c bus */ static int bcm_kona_i2c_write_fifo(struct bcm_kona_i2c_dev *dev, struct i2c_msg *msg) { … } /* Send i2c address */ static int bcm_kona_i2c_do_addr(struct bcm_kona_i2c_dev *dev, struct i2c_msg *msg) { … } static void bcm_kona_i2c_enable_autosense(struct bcm_kona_i2c_dev *dev) { … } static void bcm_kona_i2c_config_timing(struct bcm_kona_i2c_dev *dev) { … } static void bcm_kona_i2c_config_timing_hs(struct bcm_kona_i2c_dev *dev) { … } static int bcm_kona_i2c_switch_to_hs(struct bcm_kona_i2c_dev *dev) { … } static int bcm_kona_i2c_switch_to_std(struct bcm_kona_i2c_dev *dev) { … } static int bcm_kona_i2c_xfer(struct i2c_adapter *adapter, struct i2c_msg msgs[], int num) { … } static uint32_t bcm_kona_i2c_functionality(struct i2c_adapter *adap) { … } static const struct i2c_algorithm bcm_algo = …; static int bcm_kona_i2c_assign_bus_speed(struct bcm_kona_i2c_dev *dev) { … } static int bcm_kona_i2c_probe(struct platform_device *pdev) { … } static void bcm_kona_i2c_remove(struct platform_device *pdev) { … } static const struct of_device_id bcm_kona_i2c_of_match[] = …; MODULE_DEVICE_TABLE(of, bcm_kona_i2c_of_match); static struct platform_driver bcm_kona_i2c_driver = …; module_platform_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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