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i2c: designware: add MSCC Ocelot support 

The Microsemi Ocelot I2C controller is a designware IP. It also has a
second set of registers to allow tweaking SDA hold time and spike
filtering.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Tested-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
[wsa: made one function static]
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Alexandre Belloni 2018-08-31 17:11:12 +02:00 committed by Wolfram Sang
parent ffbc01bff2
commit 1bb3995962
2 changed files with 43 additions and 0 deletions
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3
drivers/i2c/busses/i2c-designware-core.h
View File

@ -225,6 +225,7 @@
struct dw_i2c_dev {
struct device *dev;
void __iomem *base;
void __iomem *ext;
struct completion cmd_complete;
struct clk *clk;
struct reset_control *rst;
@ -279,6 +280,8 @@ struct dw_i2c_dev {
#define ACCESS_INTR_MASK 0x00000004
#define MODEL_CHERRYTRAIL 0x00000100
#define MODEL_MSCC_OCELOT 0x00000200
#define MODEL_MASK 0x00000f00
u32 dw_readl(struct dw_i2c_dev *dev, int offset);
void dw_writel(struct dw_i2c_dev *dev, u32 b, int offset);

40
drivers/i2c/busses/i2c-designware-platdrv.c
View File

@ -157,11 +157,48 @@ static inline int dw_i2c_acpi_configure(struct platform_device *pdev)
#endif
#ifdef CONFIG_OF
#define MSCC_ICPU_CFG_TWI_DELAY 0x0
#define MSCC_ICPU_CFG_TWI_DELAY_ENABLE BIT(0)
#define MSCC_ICPU_CFG_TWI_SPIKE_FILTER 0x4
static int mscc_twi_set_sda_hold_time(struct dw_i2c_dev *dev)
{
writel((dev->sda_hold_time << 1) | MSCC_ICPU_CFG_TWI_DELAY_ENABLE,
dev->ext + MSCC_ICPU_CFG_TWI_DELAY);
return 0;
}
static int dw_i2c_of_configure(struct platform_device *pdev)
{
struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
struct resource *mem;
switch (dev->flags & MODEL_MASK) {
case MODEL_MSCC_OCELOT:
mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
dev->ext = devm_ioremap_resource(&pdev->dev, mem);
if (!IS_ERR(dev->ext))
dev->set_sda_hold_time = mscc_twi_set_sda_hold_time;
break;
default:
break;
}
return 0;
}
static const struct of_device_id dw_i2c_of_match[] = {
{ .compatible = "snps,designware-i2c", },
{ .compatible = "mscc,ocelot-i2c", .data = (void *)MODEL_MSCC_OCELOT },
{},
};
MODULE_DEVICE_TABLE(of, dw_i2c_of_match);
#else
static inline int dw_i2c_of_configure(struct platform_device *pdev)
{
return -ENODEV;
}
#endif
static void i2c_dw_configure_master(struct dw_i2c_dev *dev)
@ -296,6 +333,9 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)
dev->flags |= (uintptr_t)device_get_match_data(&pdev->dev);
if (pdev->dev.of_node)
dw_i2c_of_configure(pdev);
if (has_acpi_companion(&pdev->dev))
dw_i2c_acpi_configure(pdev);