From 5f33206ebe4fb4a2cc8634f29c3e3c9bc01e3416 Mon Sep 17 00:00:00 2001 From: Eddie Huang Date: Wed, 6 May 2015 16:37:07 +0800 Subject: [PATCH 31/76] I2C: mediatek: Add driver for MediaTek MT8173 I2C controller Add mediatek MT8173 I2C controller driver. Compare to I2C controller of earlier mediatek SoC, MT8173 fix write-then-read limitation, and also increase message size to 64kb. Signed-off-by: Xudong Chen Signed-off-by: Liguo Zhang Signed-off-by: Eddie Huang --- drivers/i2c/busses/i2c-mt65xx.c | 104 ++++++++++++++++++++++++++++----------- 1 file changed, 76 insertions(+), 28 deletions(-) diff --git a/drivers/i2c/busses/i2c-mt65xx.c b/drivers/i2c/busses/i2c-mt65xx.c index faecf7e..c501421 100644 --- a/drivers/i2c/busses/i2c-mt65xx.c +++ b/drivers/i2c/busses/i2c-mt65xx.c @@ -33,10 +33,13 @@ #include #include +#define I2C_RS_TRANSFER (1 << 4) #define I2C_HS_NACKERR (1 << 2) #define I2C_ACKERR (1 << 1) #define I2C_TRANSAC_COMP (1 << 0) #define I2C_TRANSAC_START (1 << 0) +#define I2C_RS_MUL_CNFG (1 << 15) +#define I2C_RS_MUL_TRIG (1 << 14) #define I2C_TIMING_STEP_DIV_MASK (0x3f << 0) #define I2C_TIMING_SAMPLE_COUNT_MASK (0x7 << 0) #define I2C_TIMING_SAMPLE_DIV_MASK (0x7 << 8) @@ -67,6 +70,9 @@ #define MAX_MSG_NUM_MT6577 1 #define MAX_DMA_TRANS_SIZE_MT6577 255 #define MAX_WRRD_TRANS_SIZE_MT6577 31 +#define MAX_MSG_NUM_MT8173 65535 +#define MAX_DMA_TRANS_SIZE_MT8173 65535 +#define MAX_WRRD_TRANS_SIZE_MT8173 65535 #define MAX_SAMPLE_CNT_DIV 8 #define MAX_STEP_CNT_DIV 64 #define MAX_HS_STEP_CNT_DIV 8 @@ -139,6 +145,7 @@ struct mtk_i2c_compatible { const struct i2c_adapter_quirks *quirks; unsigned char pmic_i2c; unsigned char dcm; + unsigned char auto_restart; }; struct mtk_i2c { @@ -172,21 +179,39 @@ static const struct i2c_adapter_quirks mt6577_i2c_quirks = { .max_comb_2nd_msg_len = MAX_WRRD_TRANS_SIZE_MT6577, }; +static const struct i2c_adapter_quirks mt8173_i2c_quirks = { + .max_num_msgs = MAX_MSG_NUM_MT8173, + .max_write_len = MAX_DMA_TRANS_SIZE_MT8173, + .max_read_len = MAX_DMA_TRANS_SIZE_MT8173, + .max_comb_1st_msg_len = MAX_DMA_TRANS_SIZE_MT8173, + .max_comb_2nd_msg_len = MAX_WRRD_TRANS_SIZE_MT8173, +}; + static const struct mtk_i2c_compatible mt6577_compat = { .quirks = &mt6577_i2c_quirks, .pmic_i2c = 0, .dcm = 1, + .auto_restart = 0, }; static const struct mtk_i2c_compatible mt6589_compat = { .quirks = &mt6577_i2c_quirks, .pmic_i2c = 1, .dcm = 0, + .auto_restart = 0, +}; + +static const struct mtk_i2c_compatible mt8173_compat = { + .quirks = &mt8173_i2c_quirks, + .pmic_i2c = 0, + .dcm = 1, + .auto_restart = 1, }; static const struct of_device_id mtk_i2c_of_match[] = { { .compatible = "mediatek,mt6577-i2c", .data = (void *)&mt6577_compat }, { .compatible = "mediatek,mt6589-i2c", .data = (void *)&mt6589_compat }, + { .compatible = "mediatek,mt8173-i2c", .data = (void *)&mt8173_compat }, {} }; MODULE_DEVICE_TABLE(of, mtk_i2c_of_match); @@ -343,9 +368,11 @@ static int mtk_i2c_set_speed(struct mtk_i2c *i2c, unsigned int clk_src_in_hz) return 0; } -static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs) +static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs, + int num, int left_num) { u16 addr_reg; + u16 start_reg; u16 control_reg; dma_addr_t rpaddr = 0; dma_addr_t wpaddr = 0; @@ -361,6 +388,8 @@ static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs) control_reg |= I2C_CONTROL_RS; if (i2c->op == I2C_MASTER_WRRD) control_reg |= I2C_CONTROL_DIR_CHANGE | I2C_CONTROL_RS; + if (left_num >= 1) + control_reg |= I2C_CONTROL_RS; mtk_i2c_writew(control_reg, i2c, OFFSET_CONTROL); /* set start condition */ @@ -375,13 +404,13 @@ static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs) mtk_i2c_writew(addr_reg, i2c, OFFSET_SLAVE_ADDR); /* Clear interrupt status */ - mtk_i2c_writew(I2C_HS_NACKERR | I2C_ACKERR | I2C_TRANSAC_COMP, - i2c, OFFSET_INTR_STAT); + mtk_i2c_writew(I2C_RS_TRANSFER | I2C_HS_NACKERR | I2C_ACKERR + | I2C_TRANSAC_COMP, i2c, OFFSET_INTR_STAT); mtk_i2c_writew(I2C_FIFO_ADDR_CLR, i2c, OFFSET_FIFO_ADDR_CLR); /* Enable interrupt */ - mtk_i2c_writew(I2C_HS_NACKERR | I2C_ACKERR | I2C_TRANSAC_COMP, - i2c, OFFSET_INTR_MASK); + mtk_i2c_writew(I2C_RS_TRANSFER | I2C_HS_NACKERR | I2C_ACKERR + | I2C_TRANSAC_COMP, i2c, OFFSET_INTR_MASK); /* Set transfer and transaction len */ if (i2c->op == I2C_MASTER_WRRD) { @@ -390,7 +419,7 @@ static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs) mtk_i2c_writew(I2C_WRRD_TRANAC_VALUE, i2c, OFFSET_TRANSAC_LEN); } else { mtk_i2c_writew(msgs->len, i2c, OFFSET_TRANSFER_LEN); - mtk_i2c_writew(I2C_RD_TRANAC_VALUE, i2c, OFFSET_TRANSAC_LEN); + mtk_i2c_writew(num, i2c, OFFSET_TRANSAC_LEN); } /* Prepare buffer data to start transfer */ @@ -436,13 +465,23 @@ static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs) /* flush before sending start */ mb(); mtk_i2c_writel_dma(I2C_DMA_START_EN, i2c, OFFSET_EN); - mtk_i2c_writew(I2C_TRANSAC_START, i2c, OFFSET_START); + + if (!i2c->dev_comp->auto_restart) { + start_reg = I2C_TRANSAC_START; + } else { + if (left_num >= 1) + start_reg = I2C_TRANSAC_START | I2C_RS_MUL_CNFG + | I2C_RS_MUL_TRIG; + else + start_reg = I2C_TRANSAC_START | I2C_RS_MUL_TRIG; + } + mtk_i2c_writew(start_reg, i2c, OFFSET_START); ret = wait_for_completion_timeout(&i2c->msg_complete, i2c->adap.timeout); /* Clear interrupt mask */ - mtk_i2c_writew(~(I2C_HS_NACKERR | I2C_ACKERR + mtk_i2c_writew(~(I2C_RS_TRANSFER | I2C_HS_NACKERR | I2C_ACKERR | I2C_TRANSAC_COMP), i2c, OFFSET_INTR_MASK); if (i2c->op == I2C_MASTER_WR) { @@ -472,6 +511,10 @@ static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs) return -EREMOTEIO; } + if (i2c->irq_stat & I2C_RS_TRANSFER) + dev_dbg(i2c->dev, "addr: %x, restart transfer interrupt.\n", + msgs->addr); + return 0; } @@ -486,28 +529,33 @@ static int mtk_i2c_transfer(struct i2c_adapter *adap, if (ret) return ret; - if (msgs->buf == NULL) { - dev_dbg(i2c->dev, "data buffer is NULL.\n"); - ret = -EINVAL; - goto err_exit; - } - - if (msgs->flags & I2C_M_RD) - i2c->op = I2C_MASTER_RD; - else - i2c->op = I2C_MASTER_WR; + while (left_num--) { + if (msgs->buf == NULL) { + dev_dbg(i2c->dev, "data buffer is NULL.\n"); + ret = -EINVAL; + goto err_exit; + } - if (num > 1) { - /* combined two messages into one transaction */ - i2c->op = I2C_MASTER_WRRD; - left_num--; - } + if (msgs->flags & I2C_M_RD) + i2c->op = I2C_MASTER_RD; + else + i2c->op = I2C_MASTER_WR; + + if (!i2c->dev_comp->auto_restart) { + if (num > 1) { + /* combined two messages into one transaction */ + i2c->op = I2C_MASTER_WRRD; + left_num--; + } + } - /* always use DMA mode. */ - ret = mtk_i2c_do_transfer(i2c, msgs); - if (ret < 0) - goto err_exit; + /* always use DMA mode. */ + ret = mtk_i2c_do_transfer(i2c, msgs, num, left_num); + if (ret < 0) + goto err_exit; + msgs++; + } /* the return value is number of executed messages */ ret = num; @@ -521,7 +569,7 @@ static irqreturn_t mtk_i2c_irq(int irqno, void *dev_id) struct mtk_i2c *i2c = dev_id; i2c->irq_stat = mtk_i2c_readw(i2c, OFFSET_INTR_STAT); - mtk_i2c_writew(I2C_HS_NACKERR | I2C_ACKERR + mtk_i2c_writew(I2C_RS_TRANSFER | I2C_HS_NACKERR | I2C_ACKERR | I2C_TRANSAC_COMP, i2c, OFFSET_INTR_STAT); complete(&i2c->msg_complete); -- 1.7.10.4