This patch adds support for MediaTek I2C interface
Reviewed-by: Heiko Schocher hs@denx.de Reviewed-by: Simon Glass sjg@chromium.org Signed-off-by: Weijie Gao weijie.gao@mediatek.com --- v2 changes: Reorganize code to reduce duplicated code Rename mtk_i2c_ofdata_to_platdata to mtk_i2c_of_to_plat --- drivers/i2c/Kconfig | 9 + drivers/i2c/Makefile | 1 + drivers/i2c/mtk_i2c.c | 822 ++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 832 insertions(+) create mode 100644 drivers/i2c/mtk_i2c.c
diff --git a/drivers/i2c/Kconfig b/drivers/i2c/Kconfig index be4724bf8e..08b6c7bdcc 100644 --- a/drivers/i2c/Kconfig +++ b/drivers/i2c/Kconfig @@ -261,6 +261,15 @@ config SYS_I2C_MESON internal buffer holding up to 8 bytes for transfers and supports both 7-bit and 10-bit addresses.
+config SYS_I2C_MTK + bool "MediaTek I2C driver" + help + This selects the MediaTek Integrated Inter Circuit bus driver. + The I2C bus adapter is the base for some other I2C client, + eg: touch, sensors. + If you want to use MediaTek I2C interface, say Y here. + If unsure, say N. + config SYS_I2C_MICROCHIP bool "Microchip I2C driver" help diff --git a/drivers/i2c/Makefile b/drivers/i2c/Makefile index 7e046f809a..920aafb91c 100644 --- a/drivers/i2c/Makefile +++ b/drivers/i2c/Makefile @@ -32,6 +32,7 @@ obj-$(CONFIG_SYS_I2C_MICROCHIP) += i2c-microchip.o obj-$(CONFIG_SYS_I2C_MV) += mv_i2c.o obj-$(CONFIG_SYS_I2C_MVTWSI) += mvtwsi.o obj-$(CONFIG_SYS_I2C_MXC) += mxc_i2c.o +obj-$(CONFIG_SYS_I2C_MTK) += mtk_i2c.o obj-$(CONFIG_SYS_I2C_NEXELL) += nx_i2c.o obj-$(CONFIG_SYS_I2C_NPCM) += npcm_i2c.o obj-$(CONFIG_SYS_I2C_OCORES) += ocores_i2c.o diff --git a/drivers/i2c/mtk_i2c.c b/drivers/i2c/mtk_i2c.c new file mode 100644 index 0000000000..5528bcd7cc --- /dev/null +++ b/drivers/i2c/mtk_i2c.c @@ -0,0 +1,822 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2022 MediaTek Inc. All Rights Reserved. + * + * Author: Mingming Lee Mingming.Lee@mediatek.com + * + * MediaTek I2C Interface driver + */ + +#include <clk.h> +#include <cpu_func.h> +#include <dm.h> +#include <i2c.h> +#include <log.h> +#include <asm/cache.h> +#include <asm/io.h> +#include <linux/delay.h> +#include <linux/errno.h> + +#define I2C_RS_TRANSFER BIT(4) +#define I2C_HS_NACKERR BIT(2) +#define I2C_ACKERR BIT(1) +#define I2C_TRANSAC_COMP BIT(0) +#define I2C_TRANSAC_START BIT(0) +#define I2C_RS_MUL_CNFG BIT(15) +#define I2C_RS_MUL_TRIG BIT(14) +#define I2C_DCM_DISABLE 0x0000 +#define I2C_IO_CONFIG_OPEN_DRAIN 0x0003 +#define I2C_IO_CONFIG_PUSH_PULL 0x0000 +#define I2C_SOFT_RST 0x0001 +#define I2C_FIFO_ADDR_CLR 0x0001 +#define I2C_DELAY_LEN 0x0002 +#define I2C_ST_START_CON 0x8001 +#define I2C_FS_START_CON 0x1800 +#define I2C_TIME_CLR_VALUE 0x0000 +#define I2C_TIME_DEFAULT_VALUE 0x0003 +#define I2C_WRRD_TRANAC_VALUE 0x0002 +#define I2C_RD_TRANAC_VALUE 0x0001 + +#define I2C_DMA_CON_TX 0x0000 +#define I2C_DMA_CON_RX 0x0001 +#define I2C_DMA_START_EN 0x0001 +#define I2C_DMA_INT_FLAG_NONE 0x0000 +#define I2C_DMA_CLR_FLAG 0x0000 +#define I2C_DMA_TX_RX 0x0000 +#define I2C_DMA_HARD_RST 0x0002 + +#define MAX_ST_MODE_SPEED 100000 +#define MAX_FS_MODE_SPEED 400000 +#define MAX_HS_MODE_SPEED 3400000 +#define MAX_SAMPLE_CNT_DIV 8 +#define MAX_STEP_CNT_DIV 64 +#define MAX_HS_STEP_CNT_DIV 8 +#define I2C_DEFAULT_CLK_DIV 4 + +#define MAX_I2C_ADDR 0x7f +#define MAX_I2C_LEN 0xff +#define TRANS_ADDR_ONLY BIT(8) +#define TRANSFER_TIMEOUT 50000 /* us */ +#define I2C_FIFO_STAT1_MASK 0x001f +#define TIMING_SAMPLE_OFFSET 8 +#define HS_SAMPLE_OFFSET 12 +#define HS_STEP_OFFSET 8 + +#define I2C_CONTROL_WRAPPER BIT(0) +#define I2C_CONTROL_RS BIT(1) +#define I2C_CONTROL_DMA_EN BIT(2) +#define I2C_CONTROL_CLK_EXT_EN BIT(3) +#define I2C_CONTROL_DIR_CHANGE BIT(4) +#define I2C_CONTROL_ACKERR_DET_EN BIT(5) +#define I2C_CONTROL_TRANSFER_LEN_CHANGE BIT(6) +#define I2C_CONTROL_DMAACK BIT(8) +#define I2C_CONTROL_ASYNC BIT(9) + +#define I2C_MASTER_WR BIT(0) +#define I2C_MASTER_RD BIT(1) +#define I2C_MASTER_WRRD (I2C_MASTER_WR | I2C_MASTER_RD) + +enum I2C_REGS_OFFSET { + REG_PORT, + REG_SLAVE_ADDR, + REG_INTR_MASK, + REG_INTR_STAT, + REG_CONTROL, + REG_TRANSFER_LEN, + REG_TRANSAC_LEN, + REG_DELAY_LEN, + REG_TIMING, + REG_START, + REG_EXT_CONF, + REG_FIFO_STAT1, + REG_LTIMING, + REG_FIFO_STAT, + REG_FIFO_THRESH, + REG_FIFO_ADDR_CLR, + REG_IO_CONFIG, + REG_RSV_DEBUG, + REG_HS, + REG_SOFTRESET, + REG_DCM_EN, + REG_PATH_DIR, + REG_DEBUGSTAT, + REG_DEBUGCTRL, + REG_TRANSFER_LEN_AUX, + REG_CLOCK_DIV, + REG_SCL_HL_RATIO, + REG_SCL_HS_HL_RATIO, + REG_SCL_MIS_COMP_POINT, + REG_STA_STOP_AC_TIME, + REG_HS_STA_STOP_AC_TIME, + REG_DATA_TIME, +}; + +enum DMA_REGS_OFFSET { + REG_INT_FLAG = 0x0, + REG_INT_EN = 0x04, + REG_EN = 0x08, + REG_RST = 0x0c, + REG_CON = 0x18, + REG_TX_MEM_ADDR = 0x1c, + REG_RX_MEM_ADDR = 0x20, + REG_TX_LEN = 0x24, + REG_RX_LEN = 0x28, +}; + +static const uint mt_i2c_regs_v1[] = { + [REG_PORT] = 0x0, + [REG_SLAVE_ADDR] = 0x4, + [REG_INTR_MASK] = 0x8, + [REG_INTR_STAT] = 0xc, + [REG_CONTROL] = 0x10, + [REG_TRANSFER_LEN] = 0x14, + [REG_TRANSAC_LEN] = 0x18, + [REG_DELAY_LEN] = 0x1c, + [REG_TIMING] = 0x20, + [REG_START] = 0x24, + [REG_EXT_CONF] = 0x28, + [REG_FIFO_STAT1] = 0x2c, + [REG_FIFO_STAT] = 0x30, + [REG_FIFO_THRESH] = 0x34, + [REG_FIFO_ADDR_CLR] = 0x38, + [REG_IO_CONFIG] = 0x40, + [REG_RSV_DEBUG] = 0x44, + [REG_HS] = 0x48, + [REG_SOFTRESET] = 0x50, + [REG_SOFTRESET] = 0x50, + [REG_DCM_EN] = 0x54, + [REG_DEBUGSTAT] = 0x64, + [REG_DEBUGCTRL] = 0x68, + [REG_TRANSFER_LEN_AUX] = 0x6c, + [REG_CLOCK_DIV] = 0x70, + [REG_SCL_HL_RATIO] = 0x74, + [REG_SCL_HS_HL_RATIO] = 0x78, + [REG_SCL_MIS_COMP_POINT] = 0x7c, + [REG_STA_STOP_AC_TIME] = 0x80, + [REG_HS_STA_STOP_AC_TIME] = 0x84, + [REG_DATA_TIME] = 0x88, +}; + +static const uint mt_i2c_regs_v2[] = { + [REG_PORT] = 0x0, + [REG_SLAVE_ADDR] = 0x4, + [REG_INTR_MASK] = 0x8, + [REG_INTR_STAT] = 0xc, + [REG_CONTROL] = 0x10, + [REG_TRANSFER_LEN] = 0x14, + [REG_TRANSAC_LEN] = 0x18, + [REG_DELAY_LEN] = 0x1c, + [REG_TIMING] = 0x20, + [REG_START] = 0x24, + [REG_EXT_CONF] = 0x28, + [REG_LTIMING] = 0x2c, + [REG_HS] = 0x30, + [REG_IO_CONFIG] = 0x34, + [REG_FIFO_ADDR_CLR] = 0x38, + [REG_TRANSFER_LEN_AUX] = 0x44, + [REG_CLOCK_DIV] = 0x48, + [REG_SOFTRESET] = 0x50, + [REG_DEBUGSTAT] = 0xe0, + [REG_DEBUGCTRL] = 0xe8, + [REG_FIFO_STAT] = 0xf4, + [REG_FIFO_THRESH] = 0xf8, + [REG_DCM_EN] = 0xf88, +}; + +struct mtk_i2c_soc_data { + const uint *regs; + uint dma_sync: 1; +}; + +struct mtk_i2c_priv { + /* set in i2c probe */ + void __iomem *base; /* i2c base addr */ + void __iomem *pdmabase; /* dma base address*/ + struct clk clk_main; /* main clock for i2c bus */ + struct clk clk_dma; /* DMA clock for i2c via DMA */ + const struct mtk_i2c_soc_data *soc_data; /* Compatible data for different IC */ + int op; /* operation mode */ + bool zero_len; /* Only transfer slave address, no data */ + bool pushpull; /* push pull mode or open drain mode */ + bool filter_msg; /* filter msg error log */ + bool auto_restart; /* restart mode */ + bool ignore_restart_irq; /* ignore restart IRQ */ + uint speed; /* i2c speed, unit: hz */ +}; + +static inline void i2c_writel(struct mtk_i2c_priv *priv, uint reg, uint value) +{ + u32 offset = priv->soc_data->regs[reg]; + + writel(value, priv->base + offset); +} + +static inline uint i2c_readl(struct mtk_i2c_priv *priv, uint offset) +{ + return readl(priv->base + priv->soc_data->regs[offset]); +} + +static int mtk_i2c_clk_enable(struct mtk_i2c_priv *priv) +{ + int ret; + + ret = clk_enable(&priv->clk_main); + if (ret) + return log_msg_ret("enable clk_main", ret); + + ret = clk_enable(&priv->clk_dma); + if (ret) + return log_msg_ret("enable clk_dma", ret); + + return 0; +} + +static int mtk_i2c_clk_disable(struct mtk_i2c_priv *priv) +{ + int ret; + + ret = clk_disable(&priv->clk_dma); + if (ret) + return log_msg_ret("disable clk_dma", ret); + + ret = clk_disable(&priv->clk_main); + if (ret) + return log_msg_ret("disable clk_main", ret); + + return 0; +} + +static void mtk_i2c_init_hw(struct mtk_i2c_priv *priv) +{ + uint control_reg; + + writel(I2C_DMA_HARD_RST, priv->pdmabase + REG_RST); + writel(I2C_DMA_CLR_FLAG, priv->pdmabase + REG_RST); + i2c_writel(priv, REG_SOFTRESET, I2C_SOFT_RST); + /* set ioconfig */ + if (priv->pushpull) + i2c_writel(priv, REG_IO_CONFIG, I2C_IO_CONFIG_PUSH_PULL); + else + i2c_writel(priv, REG_IO_CONFIG, I2C_IO_CONFIG_OPEN_DRAIN); + + i2c_writel(priv, REG_DCM_EN, I2C_DCM_DISABLE); + control_reg = I2C_CONTROL_ACKERR_DET_EN | I2C_CONTROL_CLK_EXT_EN; + if (priv->soc_data->dma_sync) + control_reg |= I2C_CONTROL_DMAACK | I2C_CONTROL_ASYNC; + i2c_writel(priv, REG_CONTROL, control_reg); + i2c_writel(priv, REG_DELAY_LEN, I2C_DELAY_LEN); +} + +/* + * 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 target_speed. The calculation try to get + * sample_cnt and step_cn + * @param[in] + * clk_src: i2c clock source + * @param[out] + * timing_step_cnt: step cnt calculate result + * @param[out] + * timing_sample_cnt: sample cnt calculate result + * @return + * 0, set speed successfully. + * -EINVAL, Unsupported speed. + */ +static int mtk_i2c_calculate_speed(uint clk_src, + uint target_speed, + uint *timing_step_cnt, + uint *timing_sample_cnt) +{ + uint base_sample_cnt = MAX_SAMPLE_CNT_DIV; + uint base_step_cnt; + uint max_step_cnt; + uint sample_cnt; + uint step_cnt; + uint opt_div; + uint best_mul; + uint cnt_mul; + + if (target_speed > MAX_HS_MODE_SPEED) + target_speed = MAX_HS_MODE_SPEED; + + if (target_speed > MAX_FS_MODE_SPEED) + max_step_cnt = MAX_HS_STEP_CNT_DIV; + else + max_step_cnt = MAX_STEP_CNT_DIV; + + base_step_cnt = max_step_cnt; + /* Find the best combination */ + opt_div = DIV_ROUND_UP(clk_src >> 1, target_speed); + best_mul = MAX_SAMPLE_CNT_DIV * max_step_cnt; + + /* + * Search for the best pair (sample_cnt, step_cnt) with + * 0 < sample_cnt < MAX_SAMPLE_CNT_DIV + * 0 < step_cnt < max_step_cnt + * sample_cnt * step_cnt >= opt_div + * optimizing for sample_cnt * step_cnt being minimal + */ + for (sample_cnt = 1; sample_cnt <= MAX_SAMPLE_CNT_DIV; sample_cnt++) { + step_cnt = DIV_ROUND_UP(opt_div, sample_cnt); + cnt_mul = step_cnt * sample_cnt; + if (step_cnt > max_step_cnt) + continue; + + if (cnt_mul < best_mul) { + best_mul = cnt_mul; + base_sample_cnt = sample_cnt; + base_step_cnt = step_cnt; + if (best_mul == opt_div) + break; + } + } + + sample_cnt = base_sample_cnt; + step_cnt = base_step_cnt; + + if ((clk_src / (2 * sample_cnt * step_cnt)) > target_speed) { + /* + * In this case, hardware can't support such + * low i2c_bus_freq + */ + debug("Unsupported speed(%uhz)\n", target_speed); + return log_msg_ret("calculate speed", -EINVAL); + } + + *timing_step_cnt = step_cnt - 1; + *timing_sample_cnt = sample_cnt - 1; + + return 0; +} + +/* + * mtk_i2c_set_speed + * + * @par Description + * Calculate i2c speed and write sample_cnt, step_cnt to TIMING register. + * @param[in] + * dev: udevice pointer, struct udevice contains i2c source clock, + * clock divide and speed. + * @return + * 0, set speed successfully.\n + * error code from mtk_i2c_calculate_speed(). + */ +static int mtk_i2c_set_speed(struct udevice *dev, uint speed) +{ + struct mtk_i2c_priv *priv = dev_get_priv(dev); + uint high_speed_reg; + uint sample_cnt; + uint timing_reg; + uint step_cnt; + uint clk_src; + int ret = 0; + + priv->speed = speed; + if (mtk_i2c_clk_enable(priv)) + return log_msg_ret("set_speed enable clk", -1); + + clk_src = clk_get_rate(&priv->clk_main) / I2C_DEFAULT_CLK_DIV; + i2c_writel(priv, REG_CLOCK_DIV, (I2C_DEFAULT_CLK_DIV - 1)); + if (priv->speed > MAX_FS_MODE_SPEED) { + /* Set master code speed register */ + ret = mtk_i2c_calculate_speed(clk_src, MAX_FS_MODE_SPEED, + &step_cnt, &sample_cnt); + if (ret < 0) + goto exit; + + timing_reg = (sample_cnt << TIMING_SAMPLE_OFFSET) | step_cnt; + i2c_writel(priv, REG_TIMING, timing_reg); + /* Set the high speed mode register */ + ret = mtk_i2c_calculate_speed(clk_src, priv->speed, + &step_cnt, &sample_cnt); + if (ret < 0) + goto exit; + + high_speed_reg = I2C_TIME_DEFAULT_VALUE | + (sample_cnt << HS_SAMPLE_OFFSET) | + (step_cnt << HS_STEP_OFFSET); + i2c_writel(priv, REG_HS, high_speed_reg); + } else { + ret = mtk_i2c_calculate_speed(clk_src, priv->speed, + &step_cnt, &sample_cnt); + if (ret < 0) + goto exit; + + timing_reg = (sample_cnt << TIMING_SAMPLE_OFFSET) | step_cnt; + /* Disable the high speed transaction */ + high_speed_reg = I2C_TIME_CLR_VALUE; + i2c_writel(priv, REG_TIMING, timing_reg); + i2c_writel(priv, REG_HS, high_speed_reg); + } +exit: + if (mtk_i2c_clk_disable(priv)) + return log_msg_ret("set_speed disable clk", -1); + + return ret; +} + +/* + * mtk_i2c_do_transfer + * + * @par Description + * Configure i2c register and trigger transfer. + * @param[in] + * priv: mtk_i2cmtk_i2c_priv pointer, struct mtk_i2c_priv contains register base\n + * address, operation mode, interrupt status and i2c driver data. + * @param[in] + * msgs: i2c_msg pointer, struct i2c_msg contains slave\n + * address, operation mode, msg length and data buffer. + * @param[in] + * num: i2c_msg number. + * @param[in] + * left_num: left i2c_msg number. + * @return + * 0, i2c transfer successfully.\n + * -ETIMEDOUT, i2c transfer timeout.\n + * -EREMOTEIO, i2c transfer ack error. + */ +static int mtk_i2c_do_transfer(struct mtk_i2c_priv *priv, + struct i2c_msg *msgs, + int num, int left_num) +{ + struct i2c_msg *msg_rx = NULL; + uint restart_flag = 0; + uint trans_error = 0; + uint irq_stat = 0; + uint tmo_poll = 0; + uint control_reg; + bool tmo = false; + uint start_reg; + uint addr_reg; + int ret = 0; + + if (priv->auto_restart) + restart_flag = I2C_RS_TRANSFER; + + control_reg = i2c_readl(priv, REG_CONTROL) & + ~(I2C_CONTROL_DIR_CHANGE | I2C_CONTROL_RS); + + if (priv->speed > MAX_FS_MODE_SPEED || num > 1) + control_reg |= I2C_CONTROL_RS; + + if (priv->op == I2C_MASTER_WRRD) + control_reg |= I2C_CONTROL_DIR_CHANGE | I2C_CONTROL_RS; + + control_reg |= I2C_CONTROL_DMA_EN; + i2c_writel(priv, REG_CONTROL, control_reg); + + /* set start condition */ + if (priv->speed <= MAX_ST_MODE_SPEED) + i2c_writel(priv, REG_EXT_CONF, I2C_ST_START_CON); + else + i2c_writel(priv, REG_EXT_CONF, I2C_FS_START_CON); + + addr_reg = msgs->addr << 1; + if (priv->op == I2C_MASTER_RD) + addr_reg |= I2C_M_RD; + if (priv->zero_len) + i2c_writel(priv, REG_SLAVE_ADDR, addr_reg | TRANS_ADDR_ONLY); + else + i2c_writel(priv, REG_SLAVE_ADDR, addr_reg); + + /* clear interrupt status */ + i2c_writel(priv, REG_INTR_STAT, restart_flag | I2C_HS_NACKERR | + I2C_ACKERR | I2C_TRANSAC_COMP); + i2c_writel(priv, REG_FIFO_ADDR_CLR, I2C_FIFO_ADDR_CLR); + + /* enable interrupt */ + i2c_writel(priv, REG_INTR_MASK, restart_flag | I2C_HS_NACKERR | + I2C_ACKERR | I2C_TRANSAC_COMP); + + /* set transfer and transaction len */ + if (priv->op == I2C_MASTER_WRRD) { + i2c_writel(priv, REG_TRANSFER_LEN, msgs->len); + i2c_writel(priv, REG_TRANSFER_LEN_AUX, (msgs + 1)->len); + i2c_writel(priv, REG_TRANSAC_LEN, I2C_WRRD_TRANAC_VALUE); + } else { + i2c_writel(priv, REG_TRANSFER_LEN, msgs->len); + i2c_writel(priv, REG_TRANSAC_LEN, num); + } + + /* Clear DMA interrupt flag */ + writel(I2C_DMA_INT_FLAG_NONE, priv->pdmabase + REG_INT_FLAG); + + /* Flush cache for first msg */ + flush_cache((ulong)msgs->buf, msgs->len); + + /* + * prepare buffer data to start transfer + * three cases here: read, write, write then read + */ + if (priv->op & I2C_MASTER_WR) { + /* Set DMA direction TX (w/ or w/o RX) */ + writel(I2C_DMA_CON_TX, priv->pdmabase + REG_CON); + + /* Write the tx buffer address to dma register */ + writel((ulong)msgs->buf, priv->pdmabase + REG_TX_MEM_ADDR); + /* Write the tx length to dma register */ + writel(msgs->len, priv->pdmabase + REG_TX_LEN); + + if (priv->op & I2C_MASTER_RD) { + /* write then read */ + msg_rx = msgs + 1; + + /* Flush cache for second msg */ + flush_cache((ulong)msg_rx->buf, msg_rx->len); + } + } + + if (priv->op & I2C_MASTER_RD) { + if (!msg_rx) { + /* Set DMA direction RX */ + writel(I2C_DMA_CON_RX, priv->pdmabase + REG_CON); + + msg_rx = msgs; + } + + /* Write the rx buffer address to dma register */ + writel((ulong)msg_rx->buf, priv->pdmabase + REG_RX_MEM_ADDR); + /* Write the rx length to dma register */ + writel(msg_rx->len, priv->pdmabase + REG_RX_LEN); + } + + writel(I2C_DMA_START_EN, priv->pdmabase + REG_EN); + + if (!priv->auto_restart) { + start_reg = I2C_TRANSAC_START; + } else { + start_reg = I2C_TRANSAC_START | I2C_RS_MUL_TRIG; + if (left_num >= 1) + start_reg |= I2C_RS_MUL_CNFG; + } + i2c_writel(priv, REG_START, start_reg); + + for (;;) { + irq_stat = i2c_readl(priv, REG_INTR_STAT); + + /* ignore the first restart irq after the master code */ + if (priv->ignore_restart_irq && (irq_stat & restart_flag)) { + priv->ignore_restart_irq = false; + irq_stat = 0; + i2c_writel(priv, REG_START, I2C_RS_MUL_CNFG | + I2C_RS_MUL_TRIG | I2C_TRANSAC_START); + } + + if (irq_stat & (I2C_TRANSAC_COMP | restart_flag)) { + tmo = false; + if (irq_stat & (I2C_HS_NACKERR | I2C_ACKERR)) + trans_error = 1; + + break; + } + udelay(1); + if (tmo_poll++ >= TRANSFER_TIMEOUT) { + tmo = true; + break; + } + } + + /* clear interrupt mask */ + i2c_writel(priv, REG_INTR_MASK, ~(restart_flag | I2C_HS_NACKERR | + I2C_ACKERR | I2C_TRANSAC_COMP)); + + if (!tmo && trans_error != 0) { + if (tmo) { + ret = -ETIMEDOUT; + if (!priv->filter_msg) + debug("I2C timeout! addr: 0x%x,\n", msgs->addr); + } else { + ret = -EREMOTEIO; + if (!priv->filter_msg) + debug("I2C ACKERR! addr: 0x%x,IRQ:0x%x\n", + msgs->addr, irq_stat); + } + mtk_i2c_init_hw(priv); + } + + return ret; +} + +/* + * mtk_i2c_transfer + * + * @par Description + * Common i2c transfer API. Set i2c transfer mode according to i2c_msg\n + * information, then call mtk_i2c_do_transfer() to configure i2c register\n + * and trigger transfer. + * @param[in] + * dev: udevice pointer, struct udevice contains struct mtk_i2c_priv, \n + * struct mtk_i2c_priv contains register base\n + * address, operation mode, interrupt status and i2c driver data. + * @param[in] + * msgs: i2c_msg pointer, struct i2c_msg contains slave\n + * address, operation mode, msg length and data buffer. + * @param[in] + * num: i2c_msg number. + * @return + * i2c_msg number, i2c transfer successfully.\n + * -EINVAL, msg length is more than 16\n + * use DMA MODE or slave address more than 0x7f.\n + * error code from mtk_i2c_init_base().\n + * error code from mtk_i2c_set_speed().\n + * error code from mtk_i2c_do_transfer(). + */ +static int mtk_i2c_transfer(struct udevice *dev, struct i2c_msg *msg, + int nmsgs) +{ + struct mtk_i2c_priv *priv = dev_get_priv(dev); + int left_num; + uint num_cnt; + int ret; + + priv->auto_restart = true; + left_num = nmsgs; + if (mtk_i2c_clk_enable(priv)) + return log_msg_ret("transfer enable clk", -1); + + for (num_cnt = 0; num_cnt < nmsgs; num_cnt++) { + if (((msg + num_cnt)->addr) > MAX_I2C_ADDR) { + ret = -EINVAL; + goto err_exit; + } + if ((msg + num_cnt)->len > MAX_I2C_LEN) { + ret = -EINVAL; + goto err_exit; + } + } + + /* check if we can skip restart and optimize using WRRD mode */ + if (priv->auto_restart && nmsgs == 2) { + if (!(msg[0].flags & I2C_M_RD) && (msg[1].flags & I2C_M_RD) && + msg[0].addr == msg[1].addr) { + priv->auto_restart = false; + } + } + + if (priv->auto_restart && nmsgs >= 2 && priv->speed > MAX_FS_MODE_SPEED) + /* ignore the first restart irq after the master code, + * otherwise the first transfer will be discarded. + */ + priv->ignore_restart_irq = true; + else + priv->ignore_restart_irq = false; + + while (left_num--) { + /* transfer slave address only to support devices detect */ + if (!msg->buf) + priv->zero_len = true; + else + priv->zero_len = false; + + if (msg->flags & I2C_M_RD) + priv->op = I2C_MASTER_RD; + else + priv->op = I2C_MASTER_WR; + + if (!priv->auto_restart) { + if (nmsgs > 1) { + /* combined two messages into one transaction */ + priv->op = I2C_MASTER_WRRD; + left_num--; + } + } + ret = mtk_i2c_do_transfer(priv, msg, nmsgs, left_num); + if (ret < 0) + goto err_exit; + msg++; + } + ret = 0; + +err_exit: + if (mtk_i2c_clk_disable(priv)) + return log_msg_ret("transfer disable clk", -1); + + return ret; +} + +static int mtk_i2c_of_to_plat(struct udevice *dev) +{ + struct mtk_i2c_priv *priv = dev_get_priv(dev); + int ret; + + priv->base = dev_remap_addr_index(dev, 0); + priv->pdmabase = dev_remap_addr_index(dev, 1); + ret = clk_get_by_index(dev, 0, &priv->clk_main); + if (ret) + return log_msg_ret("clk_get_by_index 0", ret); + + ret = clk_get_by_index(dev, 1, &priv->clk_dma); + + return ret; +} + +static int mtk_i2c_probe(struct udevice *dev) +{ + struct mtk_i2c_priv *priv = dev_get_priv(dev); + + priv->soc_data = (struct mtk_i2c_soc_data *)dev_get_driver_data(dev); + + if (mtk_i2c_clk_enable(priv)) + return log_msg_ret("probe enable clk", -1); + + mtk_i2c_init_hw(priv); + + if (mtk_i2c_clk_disable(priv)) + return log_msg_ret("probe disable clk", -1); + + return 0; +} + +static int mtk_i2c_deblock(struct udevice *dev) +{ + struct mtk_i2c_priv *priv = dev_get_priv(dev); + + if (mtk_i2c_clk_enable(priv)) + return log_msg_ret("deblock enable clk", -1); + + mtk_i2c_init_hw(priv); + + if (mtk_i2c_clk_disable(priv)) + return log_msg_ret("deblock disable clk", -1); + + return 0; +} + +static const struct mtk_i2c_soc_data mt76xx_soc_data = { + .regs = mt_i2c_regs_v1, + .dma_sync = 0, +}; + +static const struct mtk_i2c_soc_data mt7981_soc_data = { + .regs = mt_i2c_regs_v1, + .dma_sync = 1, +}; + +static const struct mtk_i2c_soc_data mt7986_soc_data = { + .regs = mt_i2c_regs_v1, + .dma_sync = 1, +}; + +static const struct mtk_i2c_soc_data mt8183_soc_data = { + .regs = mt_i2c_regs_v2, + .dma_sync = 1, +}; + +static const struct mtk_i2c_soc_data mt8518_soc_data = { + .regs = mt_i2c_regs_v1, + .dma_sync = 0, +}; + +static const struct mtk_i2c_soc_data mt8512_soc_data = { + .regs = mt_i2c_regs_v1, + .dma_sync = 1, +}; + +static const struct dm_i2c_ops mtk_i2c_ops = { + .xfer = mtk_i2c_transfer, + .set_bus_speed = mtk_i2c_set_speed, + .deblock = mtk_i2c_deblock, +}; + +static const struct udevice_id mtk_i2c_ids[] = { + { + .compatible = "mediatek,mt7622-i2c", + .data = (ulong)&mt76xx_soc_data, + }, { + .compatible = "mediatek,mt7623-i2c", + .data = (ulong)&mt76xx_soc_data, + }, { + .compatible = "mediatek,mt7629-i2c", + .data = (ulong)&mt76xx_soc_data, + }, { + .compatible = "mediatek,mt7981-i2c", + .data = (ulong)&mt7981_soc_data, + }, { + .compatible = "mediatek,mt7986-i2c", + .data = (ulong)&mt7986_soc_data, + }, { + .compatible = "mediatek,mt8183-i2c", + .data = (ulong)&mt8183_soc_data, + }, { + .compatible = "mediatek,mt8512-i2c", + .data = (ulong)&mt8512_soc_data, + }, { + .compatible = "mediatek,mt8518-i2c", + .data = (ulong)&mt8518_soc_data, + } +}; + +U_BOOT_DRIVER(mtk_i2c) = { + .name = "mtk_i2c", + .id = UCLASS_I2C, + .of_match = mtk_i2c_ids, + .of_to_plat = mtk_i2c_of_to_plat, + .probe = mtk_i2c_probe, + .priv_auto = sizeof(struct mtk_i2c_priv), + .ops = &mtk_i2c_ops, +};