// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (c) 2014 MediaTek Inc. * Author: Xudong Chen <[email protected]> */ #include <linux/clk.h> #include <linux/completion.h> #include <linux/delay.h> #include <linux/device.h> #include <linux/dma-mapping.h> #include <linux/err.h> #include <linux/errno.h> #include <linux/i2c.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/iopoll.h> #include <linux/kernel.h> #include <linux/mm.h> #include <linux/module.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/scatterlist.h> #include <linux/sched.h> #include <linux/slab.h> #define I2C_RS_TRANSFER … #define I2C_ARB_LOST … #define I2C_HS_NACKERR … #define I2C_ACKERR … #define I2C_TRANSAC_COMP … #define I2C_TRANSAC_START … #define I2C_RS_MUL_CNFG … #define I2C_RS_MUL_TRIG … #define I2C_DCM_DISABLE … #define I2C_IO_CONFIG_OPEN_DRAIN … #define I2C_IO_CONFIG_PUSH_PULL … #define I2C_SOFT_RST … #define I2C_HANDSHAKE_RST … #define I2C_FIFO_ADDR_CLR … #define I2C_DELAY_LEN … #define I2C_ST_START_CON … #define I2C_FS_START_CON … #define I2C_TIME_CLR_VALUE … #define I2C_TIME_DEFAULT_VALUE … #define I2C_WRRD_TRANAC_VALUE … #define I2C_RD_TRANAC_VALUE … #define I2C_SCL_MIS_COMP_VALUE … #define I2C_CHN_CLR_FLAG … #define I2C_RELIABILITY … #define I2C_DMAACK_ENABLE … #define I2C_DMA_CON_TX … #define I2C_DMA_CON_RX … #define I2C_DMA_ASYNC_MODE … #define I2C_DMA_SKIP_CONFIG … #define I2C_DMA_DIR_CHANGE … #define I2C_DMA_START_EN … #define I2C_DMA_INT_FLAG_NONE … #define I2C_DMA_CLR_FLAG … #define I2C_DMA_WARM_RST … #define I2C_DMA_HARD_RST … #define I2C_DMA_HANDSHAKE_RST … #define MAX_SAMPLE_CNT_DIV … #define MAX_STEP_CNT_DIV … #define MAX_CLOCK_DIV_8BITS … #define MAX_CLOCK_DIV_5BITS … #define MAX_HS_STEP_CNT_DIV … #define I2C_STANDARD_MODE_BUFFER … #define I2C_FAST_MODE_BUFFER … #define I2C_FAST_MODE_PLUS_BUFFER … #define I2C_CONTROL_RS … #define I2C_CONTROL_DMA_EN … #define I2C_CONTROL_CLK_EXT_EN … #define I2C_CONTROL_DIR_CHANGE … #define I2C_CONTROL_ACKERR_DET_EN … #define I2C_CONTROL_TRANSFER_LEN_CHANGE … #define I2C_CONTROL_DMAACK_EN … #define I2C_CONTROL_ASYNC_MODE … #define I2C_CONTROL_WRAPPER … #define I2C_DRV_NAME … /** * enum i2c_mt65xx_clks - Clocks enumeration for MT65XX I2C * * @I2C_MT65XX_CLK_MAIN: main clock for i2c bus * @I2C_MT65XX_CLK_DMA: DMA clock for i2c via DMA * @I2C_MT65XX_CLK_PMIC: PMIC clock for i2c from PMIC * @I2C_MT65XX_CLK_ARB: Arbitrator clock for i2c * @I2C_MT65XX_CLK_MAX: Number of supported clocks */ enum i2c_mt65xx_clks { … }; static const char * const i2c_mt65xx_clk_ids[I2C_MT65XX_CLK_MAX] = …; enum DMA_REGS_OFFSET { … }; enum i2c_trans_st_rs { … }; enum mtk_trans_op { … }; enum I2C_REGS_OFFSET { … }; static const u16 mt_i2c_regs_v1[] = …; static const u16 mt_i2c_regs_v2[] = …; static const u16 mt_i2c_regs_v3[] = …; struct mtk_i2c_compatible { … }; struct mtk_i2c_ac_timing { … }; struct mtk_i2c { … }; /** * struct i2c_spec_values: * @min_low_ns: min LOW period of the SCL clock * @min_su_sta_ns: min set-up time for a repeated START condition * @max_hd_dat_ns: max data hold time * @min_su_dat_ns: min data set-up time */ struct i2c_spec_values { … }; static const struct i2c_spec_values standard_mode_spec = …; static const struct i2c_spec_values fast_mode_spec = …; static const struct i2c_spec_values fast_mode_plus_spec = …; static const struct i2c_adapter_quirks mt6577_i2c_quirks = …; static const struct i2c_adapter_quirks mt7622_i2c_quirks = …; static const struct i2c_adapter_quirks mt8183_i2c_quirks = …; static const struct mtk_i2c_compatible mt2712_compat = …; static const struct mtk_i2c_compatible mt6577_compat = …; static const struct mtk_i2c_compatible mt6589_compat = …; static const struct mtk_i2c_compatible mt7622_compat = …; static const struct mtk_i2c_compatible mt8168_compat = …; static const struct mtk_i2c_compatible mt7981_compat = …; static const struct mtk_i2c_compatible mt7986_compat = …; static const struct mtk_i2c_compatible mt8173_compat = …; static const struct mtk_i2c_compatible mt8183_compat = …; static const struct mtk_i2c_compatible mt8186_compat = …; static const struct mtk_i2c_compatible mt8188_compat = …; static const struct mtk_i2c_compatible mt8192_compat = …; static const struct of_device_id mtk_i2c_of_match[] = …; MODULE_DEVICE_TABLE(of, mtk_i2c_of_match); static u16 mtk_i2c_readw(struct mtk_i2c *i2c, enum I2C_REGS_OFFSET reg) { … } static void mtk_i2c_writew(struct mtk_i2c *i2c, u16 val, enum I2C_REGS_OFFSET reg) { … } static void mtk_i2c_init_hw(struct mtk_i2c *i2c) { … } static const struct i2c_spec_values *mtk_i2c_get_spec(unsigned int speed) { … } static int mtk_i2c_max_step_cnt(unsigned int target_speed) { … } static int mtk_i2c_get_clk_div_restri(struct mtk_i2c *i2c, unsigned int sample_cnt) { … } /* * Check and Calculate i2c ac-timing * * Hardware design: * sample_ns = (1000000000 * (sample_cnt + 1)) / clk_src * xxx_cnt_div = spec->min_xxx_ns / sample_ns * * Sample_ns is rounded down for xxx_cnt_div would be greater * than the smallest spec. * The sda_timing is chosen as the middle value between * the largest and smallest. */ static int mtk_i2c_check_ac_timing(struct mtk_i2c *i2c, unsigned int clk_src, unsigned int check_speed, unsigned int step_cnt, unsigned int sample_cnt) { … } /* * Calculate i2c port speed * * Hardware design: * i2c_bus_freq = parent_clk / (clock_div * 2 * sample_cnt * step_cnt) * clock_div: fixed in hardware, but may be various in different SoCs * * The calculation want to pick the highest bus frequency that is still * less than or equal to i2c->speed_hz. The calculation try to get * sample_cnt and step_cn */ static int mtk_i2c_calculate_speed(struct mtk_i2c *i2c, unsigned int clk_src, unsigned int target_speed, unsigned int *timing_step_cnt, unsigned int *timing_sample_cnt) { … } static int mtk_i2c_set_speed(struct mtk_i2c *i2c, unsigned int parent_clk) { … } static void i2c_dump_register(struct mtk_i2c *i2c) { … } static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs, int num, int left_num) { … } static int mtk_i2c_transfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num) { … } static irqreturn_t mtk_i2c_irq(int irqno, void *dev_id) { … } static u32 mtk_i2c_functionality(struct i2c_adapter *adap) { … } static const struct i2c_algorithm mtk_i2c_algorithm = …; static int mtk_i2c_parse_dt(struct device_node *np, struct mtk_i2c *i2c) { … } static int mtk_i2c_probe(struct platform_device *pdev) { … } static void mtk_i2c_remove(struct platform_device *pdev) { … } static int mtk_i2c_suspend_noirq(struct device *dev) { … } static int mtk_i2c_resume_noirq(struct device *dev) { … } static const struct dev_pm_ops mtk_i2c_pm = …; static struct platform_driver mtk_i2c_driver = …; module_platform_driver(…) …; MODULE_LICENSE(…) …; MODULE_DESCRIPTION(…) …; MODULE_AUTHOR(…) …;
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