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i2c: designware: add common functions for locking

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These are used in 2 places and will be needed in more.

Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Tested-by: Christian Ruppert <christian.ruppert@alitech.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Lucas De Marchi 2016-08-23 19:18:54 -03:00 committed by Wolfram Sang
parent 2702ea7dbe
commit 8c5660bb29
1 changed files with 32 additions and 20 deletions
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52
drivers/i2c/busses/i2c-designware-core.c
View file

@ -292,6 +292,28 @@ static unsigned long i2c_dw_clk_rate(struct dw_i2c_dev *dev)
return dev->get_clk_rate_khz(dev);
}
static int i2c_dw_acquire_lock(struct dw_i2c_dev *dev)
{
int ret;
if (!dev->acquire_lock)
return 0;
ret = dev->acquire_lock(dev);
if (!ret)
return 0;
dev_err(dev->dev, "couldn't acquire bus ownership\n");
return ret;
}
static void i2c_dw_release_lock(struct dw_i2c_dev *dev)
{
if (dev->release_lock)
dev->release_lock(dev);
}
/**
* i2c_dw_init() - initialize the designware i2c master hardware
* @dev: device private data
@ -307,13 +329,9 @@ int i2c_dw_init(struct dw_i2c_dev *dev)
u32 sda_falling_time, scl_falling_time;
int ret;
if (dev->acquire_lock) {
ret = dev->acquire_lock(dev);
if (ret) {
dev_err(dev->dev, "couldn't acquire bus ownership\n");
return ret;
}
}
ret = i2c_dw_acquire_lock(dev);
if (ret)
return ret;
reg = dw_readl(dev, DW_IC_COMP_TYPE);
if (reg == ___constant_swab32(DW_IC_COMP_TYPE_VALUE)) {
@ -325,8 +343,7 @@ int i2c_dw_init(struct dw_i2c_dev *dev)
} else if (reg != DW_IC_COMP_TYPE_VALUE) {
dev_err(dev->dev, "Unknown Synopsys component type: "
"0x%08x\n", reg);
if (dev->release_lock)
dev->release_lock(dev);
i2c_dw_release_lock(dev);
return -ENODEV;
}
@ -415,8 +432,8 @@ int i2c_dw_init(struct dw_i2c_dev *dev)
/* configure the i2c master */
dw_writel(dev, dev->master_cfg , DW_IC_CON);
if (dev->release_lock)
dev->release_lock(dev);
i2c_dw_release_lock(dev);
return 0;
}
EXPORT_SYMBOL_GPL(i2c_dw_init);
@ -679,13 +696,9 @@ i2c_dw_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
dev->abort_source = 0;
dev->rx_outstanding = 0;
if (dev->acquire_lock) {
ret = dev->acquire_lock(dev);
if (ret) {
dev_err(dev->dev, "couldn't acquire bus ownership\n");
goto done_nolock;
}
}
ret = i2c_dw_acquire_lock(dev);
if (ret)
goto done_nolock;
ret = i2c_dw_wait_bus_not_busy(dev);
if (ret < 0)
@ -732,8 +745,7 @@ i2c_dw_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
ret = -EIO;
done:
if (dev->release_lock)
dev->release_lock(dev);
i2c_dw_release_lock(dev);
done_nolock:
pm_runtime_mark_last_busy(dev->dev);