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i2c: designware: enable SLAVE in platform module 

- Slave mode selected in platform module if the support is detected in
  the DT.

Signed-off-by: Luis Oliveira <lolivei@synopsys.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Luis Oliveira 2017-06-22 11:17:33 +01:00 committed by Wolfram Sang
parent 9f3e065c54
commit 5b6d721b26
2 changed files with 38 additions and 5 deletions
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2
drivers/i2c/busses/i2c-designware-core.h
View File

@ -228,6 +228,7 @@
* @disable: function to disable the controller
* @disable_int: function to disable all interrupts
* @init: function to initialize the I2C hardware
* @mode: operation mode - DW_IC_MASTER or DW_IC_SLAVE
*
* HCNT and LCNT parameters can be used if the platform knows more accurate
* values than the one computed based only on the input clock frequency.
@ -282,6 +283,7 @@ struct dw_i2c_dev {
void (*disable)(struct dw_i2c_dev *dev);
void (*disable_int)(struct dw_i2c_dev *dev);
int (*init)(struct dw_i2c_dev *dev);
int mode;
};
#define ACCESS_SWAP 0x00000001

41
drivers/i2c/busses/i2c-designware-platdrv.c
View File

@ -1,5 +1,5 @@
/*
* Synopsys DesignWare I2C adapter driver (master only).
* Synopsys DesignWare I2C adapter driver.
*
* Based on the TI DAVINCI I2C adapter driver.
*
@ -174,9 +174,13 @@ static inline int dw_i2c_acpi_configure(struct platform_device *pdev)
static void i2c_dw_configure_master(struct dw_i2c_dev *dev)
{
dev->functionality = I2C_FUNC_10BIT_ADDR | DW_IC_DEFAULT_FUNCTIONALITY;
dev->master_cfg = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE |
DW_IC_CON_RESTART_EN;
dev->mode = DW_IC_MASTER;
switch (dev->clk_freq) {
case 100000:
dev->master_cfg |= DW_IC_CON_SPEED_STD;
@ -189,6 +193,28 @@ static void i2c_dw_configure_master(struct dw_i2c_dev *dev)
}
}
static void i2c_dw_configure_slave(struct dw_i2c_dev *dev)
{
dev->functionality = I2C_FUNC_SLAVE | DW_IC_DEFAULT_FUNCTIONALITY;
dev->slave_cfg = DW_IC_CON_RX_FIFO_FULL_HLD_CTRL |
DW_IC_CON_RESTART_EN | DW_IC_CON_STOP_DET_IFADDRESSED |
DW_IC_CON_SPEED_FAST;
dev->mode = DW_IC_SLAVE;
switch (dev->clk_freq) {
case 100000:
dev->slave_cfg |= DW_IC_CON_SPEED_STD;
break;
case 3400000:
dev->slave_cfg |= DW_IC_CON_SPEED_HIGH;
break;
default:
dev->slave_cfg |= DW_IC_CON_SPEED_FAST;
}
}
static int i2c_dw_plat_prepare_clk(struct dw_i2c_dev *i_dev, bool prepare)
{
if (IS_ERR(i_dev->clk))
@ -302,9 +328,10 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)
if (ret)
goto exit_reset;
dev->functionality = I2C_FUNC_10BIT_ADDR | DW_IC_DEFAULT_FUNCTIONALITY;
i2c_dw_configure_master(dev);
if (i2c_detect_slave_mode(&pdev->dev))
i2c_dw_configure_slave(dev);
else
i2c_dw_configure_master(dev);
dev->clk = devm_clk_get(&pdev->dev, NULL);
if (!i2c_dw_plat_prepare_clk(dev, true)) {
@ -333,7 +360,11 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)
pm_runtime_enable(&pdev->dev);
}
ret = i2c_dw_probe(dev);
if (dev->mode == DW_IC_SLAVE)
ret = i2c_dw_probe_slave(dev);
else
ret = i2c_dw_probe(dev);
if (ret)
goto exit_probe;