i2c.c File Reference

#include <string.h>
#include <assert.h>
#include <console/console.h>
#include <delay.h>
#include <timer.h>
#include <symbols.h>
#include <device/mmio.h>
#include <soc/i2c.h>
#include <soc/i2c_common.h>
#include <device/i2c_simple.h>

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Functions
__weak void	mtk_i2c_dump_more_info (struct mt_i2c_regs *regs)
__weak void	mtk_i2c_config_timing (struct mt_i2c_regs *regs, struct mtk_i2c *bus_ctrl)
const struct i2c_spec_values *	mtk_i2c_get_spec (uint32_t speed)
static void	i2c_hw_reset (uint8_t bus)
static void	mtk_i2c_dump_info (struct mt_i2c_regs *regs)
static int	mtk_i2c_transfer (uint8_t bus, struct i2c_msg *seg, enum i2c_modes mode)
static bool	mtk_i2c_should_combine (struct i2c_msg *seg, int left_count)
static int	mtk_i2c_max_step_cnt (uint32_t target_speed)
int	platform_i2c_transfer (unsigned int bus, struct i2c_msg *segments, int seg_count)
int	mtk_i2c_check_ac_timing (uint8_t bus, uint32_t clk_src, uint32_t check_speed, uint32_t step_cnt, uint32_t sample_cnt)
int	mtk_i2c_calculate_speed (uint8_t bus, uint32_t clk_src, uint32_t target_speed, uint32_t *timing_step_cnt, uint32_t *timing_sample_cnt)
void	mtk_i2c_speed_init (uint8_t bus, uint32_t speed)

Variables
const struct i2c_spec_values	standard_mode_spec
const struct i2c_spec_values	fast_mode_spec
const struct i2c_spec_values	fast_mode_plus_spec

Function Documentation

i2c_hw_reset()

static void i2c_hw_reset ( uint8_t  bus )

inlinestatic

Definition at line 55 of file i2c.c.

References mt_i2c_dma_regs::dma_rst, I2C_APDMA_ASYNC, I2C_CLR_FLAG, I2C_DMA_CLR_FLAG, I2C_DMA_HANDSHAKE_RST, I2C_DMA_HARD_RST, mtk_i2c::i2c_dma_regs, I2C_DMA_WARM_RST, I2C_HANDSHAKE_RST, mtk_i2c::i2c_regs, I2C_SOFT_RST, mtk_i2c_bus_controller, regs, udelay(), and write32().

Referenced by mtk_i2c_transfer().

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mtk_i2c_calculate_speed()

int mtk_i2c_calculate_speed	(	uint8_t	bus,
		uint32_t	clk_src,
		uint32_t	target_speed,
		uint32_t *	timing_step_cnt,
		uint32_t *	timing_sample_cnt
	)

Definition at line 408 of file i2c.c.

References mtk_i2c::ac_timing, DIV_ROUND_UP, I2C_SPEED_HIGH, mtk_i2c_ac_timing::inter_clk_div, MAX_SAMPLE_CNT_DIV, mtk_i2c_bus_controller, mtk_i2c_check_ac_timing(), and mtk_i2c_max_step_cnt().

Referenced by mtk_i2c_speed_init().

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mtk_i2c_check_ac_timing()

int mtk_i2c_check_ac_timing	(	uint8_t	bus,
		uint32_t	clk_src,
		uint32_t	check_speed,
		uint32_t	step_cnt,
		uint32_t	sample_cnt
	)

Definition at line 339 of file i2c.c.

References mtk_i2c::ac_timing, DIV_ROUND_UP, mtk_i2c_ac_timing::ext, GENMASK, mtk_i2c_ac_timing::hs, mtk_i2c_ac_timing::htiming, I2C_SPEED_FAST_PLUS, I2C_TIME_DEFAULT_VALUE, mtk_i2c_ac_timing::ltiming, i2c_spec_values::max_hd_dat_ns, i2c_spec_values::min_low_ns, i2c_spec_values::min_su_dat_ns, i2c_spec_values::min_su_sta_ns, mtk_i2c_bus_controller, mtk_i2c_get_spec(), mtk_i2c_max_step_cnt(), and NSECS_PER_SEC.

Referenced by mtk_i2c_calculate_speed().

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mtk_i2c_config_timing()

__weak void mtk_i2c_config_timing	(	struct mt_i2c_regs *	regs,
		struct mtk_i2c *	bus_ctrl
	)

Definition at line 40 of file i2c.c.

Referenced by mtk_i2c_speed_init().

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mtk_i2c_dump_info()

static void mtk_i2c_dump_info ( struct mt_i2c_regs *  regs )

inlinestatic

Definition at line 85 of file i2c.c.

References BIOS_DEBUG, mtk_i2c_dump_more_info(), printk, and read32().

Referenced by mtk_i2c_transfer().

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mtk_i2c_dump_more_info()

__weak void mtk_i2c_dump_more_info

(

struct mt_i2c_regs *

regs

)

Definition at line 35 of file i2c.c.

Referenced by mtk_i2c_dump_info().

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mtk_i2c_get_spec()

const struct i2c_spec_values* mtk_i2c_get_spec

(

uint32_t

speed

)

Definition at line 45 of file i2c.c.

References fast_mode_plus_spec, fast_mode_spec, I2C_SPEED_FAST, I2C_SPEED_STANDARD, and standard_mode_spec.

Referenced by mtk_i2c_check_ac_timing().

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mtk_i2c_max_step_cnt()

static int mtk_i2c_max_step_cnt ( uint32_t  target_speed )

static

Definition at line 293 of file i2c.c.

References I2C_SPEED_FAST_PLUS, MAX_HS_STEP_CNT_DIV, and MAX_STEP_CNT_DIV.

Referenced by mtk_i2c_calculate_speed(), and mtk_i2c_check_ac_timing().

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mtk_i2c_should_combine()

static bool mtk_i2c_should_combine ( struct i2c_msg *  seg, int  left_count  )

static

Definition at line 285 of file i2c.c.

References I2C_M_RD, and slave.

Referenced by platform_i2c_transfer().

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mtk_i2c_speed_init()

void mtk_i2c_speed_init	(	uint8_t	bus,
		uint32_t	speed
	)

Definition at line 494 of file i2c.c.

References mtk_i2c::ac_timing, BIOS_ERR, mtk_i2c_ac_timing::hs, I2C_BUS_NUMBER, I2C_CLK_HZ, mtk_i2c::i2c_regs, I2C_SPEED_FAST, I2C_SPEED_FAST_PLUS, I2C_TIME_CLR_VALUE, mtk_i2c_ac_timing::inter_clk_div, MAX_CLOCK_DIV, mtk_i2c_bus_controller, mtk_i2c_calculate_speed(), mtk_i2c_config_timing(), and printk.

Referenced by mtk_i2c_bus_init().

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mtk_i2c_transfer()

static int mtk_i2c_transfer ( uint8_t  bus, struct i2c_msg *  seg, enum i2c_modes  mode  )

static

Definition at line 109 of file i2c.c.

References ACK_ERR_DET_EN, addr, assert, ASYNC_MODE, BIOS_ERR, i2c_msg::buf, CLK_EXT, DIR_CHG, mt_i2c_dma_regs::dma_con, mt_i2c_dma_regs::dma_en, DMA_EN, mt_i2c_dma_regs::dma_int_flag, mt_i2c_dma_regs::dma_rx_len, mt_i2c_dma_regs::dma_rx_mem_addr, mt_i2c_dma_regs::dma_tx_len, mt_i2c_dma_regs::dma_tx_mem_addr, DMAACK_EN, I2C_ACKERR, I2C_APDMA_ASYNC, I2C_DMA_ASYNC_MODE, I2C_DMA_CLR_FLAG, I2C_DMA_CON_RX, I2C_DMA_CON_TX, I2C_DMA_DIR_CHANGE, mtk_i2c::i2c_dma_regs, I2C_DMA_SKIP_CONFIG, I2C_DMA_START_EN, I2C_HS_NACKERR, i2c_hw_reset(), I2C_OK, I2C_READ_MODE, mtk_i2c::i2c_regs, I2C_TRANSAC_COMP, I2C_TRANSFER_FAIL_ACKERR, I2C_TRANSFER_FAIL_HS_NACKERR, I2C_TRANSFER_FAIL_TIMEOUT, I2C_WRITE_MODE, I2C_WRITE_READ_MODE, i2c_msg::len, memcpy(), mtk_i2c_bus_controller, mtk_i2c_dump_info(), NULL, printk, read32(), regs, REPEATED_START_FLAG, i2c_msg::slave, stopwatch_expired(), stopwatch_init_usecs_expire(), and write32().

Referenced by platform_i2c_transfer().

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platform_i2c_transfer()

int platform_i2c_transfer	(	unsigned int	bus,
		struct i2c_msg *	segments,
		int	seg_count
	)

Definition at line 301 of file i2c.c.

References i2c_msg::flags, I2C_M_RD, I2C_READ_MODE, I2C_WRITE_MODE, I2C_WRITE_READ_MODE, mtk_i2c_should_combine(), and mtk_i2c_transfer().

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Variable Documentation

fast_mode_plus_spec

const struct i2c_spec_values fast_mode_plus_spec

Initial value:

= {
        .min_low_ns = 500 + I2C_FAST_MODE_PLUS_BUFFER,
        .min_su_sta_ns = 260 + I2C_FAST_MODE_PLUS_BUFFER,
        .max_hd_dat_ns = 400 - I2C_FAST_MODE_PLUS_BUFFER,
        .min_su_dat_ns = 50 + I2C_FAST_MODE_PLUS_BUFFER,
}

Definition at line 1 of file i2c.c.

Referenced by mtk_i2c_get_spec().

fast_mode_spec

const struct i2c_spec_values fast_mode_spec

Initial value:

= {
        .min_low_ns = 1300 + I2C_FAST_MODE_BUFFER,
        .min_su_sta_ns = 600 + I2C_FAST_MODE_BUFFER,
        .max_hd_dat_ns = 900 - I2C_FAST_MODE_BUFFER,
        .min_su_dat_ns = 100 + I2C_FAST_MODE_BUFFER,
}

Definition at line 1 of file i2c.c.

Referenced by mtk_i2c_get_spec().

standard_mode_spec

const struct i2c_spec_values standard_mode_spec

Initial value:

= {
        .min_low_ns = 4700 + I2C_STANDARD_MODE_BUFFER,
        .min_su_sta_ns = 4700 + I2C_STANDARD_MODE_BUFFER,
        .max_hd_dat_ns = 3450 - I2C_STANDARD_MODE_BUFFER,
        .min_su_dat_ns = 250 + I2C_STANDARD_MODE_BUFFER,
}

Definition at line 1 of file i2c.c.

Referenced by mtk_i2c_get_spec().