diff options
Diffstat (limited to 'drivers/i2c/busses/i2c-imx.c')
| -rw-r--r-- | drivers/i2c/busses/i2c-imx.c | 85 |
1 files changed, 74 insertions, 11 deletions
diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c index b444fbf1a262..b80fdc1f0092 100644 --- a/drivers/i2c/busses/i2c-imx.c +++ b/drivers/i2c/busses/i2c-imx.c @@ -209,6 +209,7 @@ struct imx_i2c_struct { struct imx_i2c_dma *dma; struct i2c_client *slave; + enum i2c_slave_event last_slave_event; }; static const struct imx_i2c_hwdata imx1_i2c_hwdata = { @@ -241,6 +242,19 @@ static struct imx_i2c_hwdata vf610_i2c_hwdata = { }; +static const struct platform_device_id imx_i2c_devtype[] = { + { + .name = "imx1-i2c", + .driver_data = (kernel_ulong_t)&imx1_i2c_hwdata, + }, { + .name = "imx21-i2c", + .driver_data = (kernel_ulong_t)&imx21_i2c_hwdata, + }, { + /* sentinel */ + } +}; +MODULE_DEVICE_TABLE(platform, imx_i2c_devtype); + static const struct of_device_id i2c_imx_dt_ids[] = { { .compatible = "fsl,imx1-i2c", .data = &imx1_i2c_hwdata, }, { .compatible = "fsl,imx21-i2c", .data = &imx21_i2c_hwdata, }, @@ -537,7 +551,7 @@ static void i2c_imx_set_clk(struct imx_i2c_struct *i2c_imx, i2c_imx->cur_clk = i2c_clk_rate; - div = (i2c_clk_rate + i2c_imx->bitrate - 1) / i2c_imx->bitrate; + div = DIV_ROUND_UP(i2c_clk_rate, i2c_imx->bitrate); if (div < i2c_clk_div[0].div) i = 0; else if (div > i2c_clk_div[i2c_imx->hwdata->ndivs - 1].div) @@ -555,8 +569,8 @@ static void i2c_imx_set_clk(struct imx_i2c_struct *i2c_imx, * This delay is used in I2C bus disable function * to fix chip hardware bug. */ - i2c_imx->disable_delay = (500000U * i2c_clk_div[i].div - + (i2c_clk_rate / 2) - 1) / (i2c_clk_rate / 2); + i2c_imx->disable_delay = DIV_ROUND_UP(500000U * i2c_clk_div[i].div, + i2c_clk_rate / 2); #ifdef CONFIG_I2C_DEBUG_BUS dev_dbg(&i2c_imx->adapter.dev, "I2C_CLK=%d, REQ DIV=%d\n", @@ -662,6 +676,36 @@ static void i2c_imx_enable_bus_idle(struct imx_i2c_struct *i2c_imx) } } +static void i2c_imx_slave_event(struct imx_i2c_struct *i2c_imx, + enum i2c_slave_event event, u8 *val) +{ + i2c_slave_event(i2c_imx->slave, event, val); + i2c_imx->last_slave_event = event; +} + +static void i2c_imx_slave_finish_op(struct imx_i2c_struct *i2c_imx) +{ + u8 val; + + while (i2c_imx->last_slave_event != I2C_SLAVE_STOP) { + switch (i2c_imx->last_slave_event) { + case I2C_SLAVE_READ_REQUESTED: + i2c_imx_slave_event(i2c_imx, I2C_SLAVE_READ_PROCESSED, + &val); + break; + + case I2C_SLAVE_WRITE_REQUESTED: + case I2C_SLAVE_READ_PROCESSED: + case I2C_SLAVE_WRITE_RECEIVED: + i2c_imx_slave_event(i2c_imx, I2C_SLAVE_STOP, &val); + break; + + case I2C_SLAVE_STOP: + break; + } + } +} + static irqreturn_t i2c_imx_slave_isr(struct imx_i2c_struct *i2c_imx, unsigned int status, unsigned int ctl) { @@ -674,9 +718,11 @@ static irqreturn_t i2c_imx_slave_isr(struct imx_i2c_struct *i2c_imx, } if (status & I2SR_IAAS) { /* Addressed as a slave */ + i2c_imx_slave_finish_op(i2c_imx); if (status & I2SR_SRW) { /* Master wants to read from us*/ dev_dbg(&i2c_imx->adapter.dev, "read requested"); - i2c_slave_event(i2c_imx->slave, I2C_SLAVE_READ_REQUESTED, &value); + i2c_imx_slave_event(i2c_imx, + I2C_SLAVE_READ_REQUESTED, &value); /* Slave transmit */ ctl |= I2CR_MTX; @@ -686,7 +732,8 @@ static irqreturn_t i2c_imx_slave_isr(struct imx_i2c_struct *i2c_imx, imx_i2c_write_reg(value, i2c_imx, IMX_I2C_I2DR); } else { /* Master wants to write to us */ dev_dbg(&i2c_imx->adapter.dev, "write requested"); - i2c_slave_event(i2c_imx->slave, I2C_SLAVE_WRITE_REQUESTED, &value); + i2c_imx_slave_event(i2c_imx, + I2C_SLAVE_WRITE_REQUESTED, &value); /* Slave receive */ ctl &= ~I2CR_MTX; @@ -697,17 +744,20 @@ static irqreturn_t i2c_imx_slave_isr(struct imx_i2c_struct *i2c_imx, } else if (!(ctl & I2CR_MTX)) { /* Receive mode */ if (status & I2SR_IBB) { /* No STOP signal detected */ value = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2DR); - i2c_slave_event(i2c_imx->slave, I2C_SLAVE_WRITE_RECEIVED, &value); + i2c_imx_slave_event(i2c_imx, + I2C_SLAVE_WRITE_RECEIVED, &value); } else { /* STOP signal is detected */ dev_dbg(&i2c_imx->adapter.dev, "STOP signal detected"); - i2c_slave_event(i2c_imx->slave, I2C_SLAVE_STOP, &value); + i2c_imx_slave_event(i2c_imx, + I2C_SLAVE_STOP, &value); } } else if (!(status & I2SR_RXAK)) { /* Transmit mode received ACK */ ctl |= I2CR_MTX; imx_i2c_write_reg(ctl, i2c_imx, IMX_I2C_I2CR); - i2c_slave_event(i2c_imx->slave, I2C_SLAVE_READ_PROCESSED, &value); + i2c_imx_slave_event(i2c_imx, + I2C_SLAVE_READ_PROCESSED, &value); imx_i2c_write_reg(value, i2c_imx, IMX_I2C_I2DR); } else { /* Transmit mode received NAK */ @@ -748,6 +798,7 @@ static int i2c_imx_reg_slave(struct i2c_client *client) return -EBUSY; i2c_imx->slave = client; + i2c_imx->last_slave_event = I2C_SLAVE_STOP; /* Resume */ ret = pm_runtime_get_sync(i2c_imx->adapter.dev.parent); @@ -800,10 +851,17 @@ static irqreturn_t i2c_imx_isr(int irq, void *dev_id) status = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2SR); ctl = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2CR); + if (status & I2SR_IIF) { i2c_imx_clear_irq(i2c_imx, I2SR_IIF); - if (i2c_imx->slave && !(ctl & I2CR_MSTA)) - return i2c_imx_slave_isr(i2c_imx, status, ctl); + if (i2c_imx->slave) { + if (!(ctl & I2CR_MSTA)) { + return i2c_imx_slave_isr(i2c_imx, status, ctl); + } else if (i2c_imx->last_slave_event != + I2C_SLAVE_STOP) { + i2c_imx_slave_finish_op(i2c_imx); + } + } return i2c_imx_master_isr(i2c_imx, status); } @@ -1330,7 +1388,11 @@ static int i2c_imx_probe(struct platform_device *pdev) return -ENOMEM; match = device_get_match_data(&pdev->dev); - i2c_imx->hwdata = match; + if (match) + i2c_imx->hwdata = match; + else + i2c_imx->hwdata = (struct imx_i2c_hwdata *) + platform_get_device_id(pdev)->driver_data; /* Setup i2c_imx driver structure */ strlcpy(i2c_imx->adapter.name, pdev->name, sizeof(i2c_imx->adapter.name)); @@ -1498,6 +1560,7 @@ static struct platform_driver i2c_imx_driver = { .of_match_table = i2c_imx_dt_ids, .acpi_match_table = i2c_imx_acpi_ids, }, + .id_table = imx_i2c_devtype, }; static int __init i2c_adap_imx_init(void) |