/* Treat S3C2410 as baseline hardware, anything else is supported via quirks */
#define QUIRK_S3C2440 (1 << 0)
+#define QUIRK_HDMIPHY (1 << 1)
+#define QUIRK_NO_GPIO (1 << 2)
/* i2c controller state */
enum s3c24xx_i2c_state {
}, {
.name = "s3c2440-i2c",
.driver_data = QUIRK_S3C2440,
+ }, {
+ .name = "s3c2440-hdmiphy-i2c",
+ .driver_data = QUIRK_S3C2440 | QUIRK_HDMIPHY | QUIRK_NO_GPIO,
}, { },
};
MODULE_DEVICE_TABLE(platform, s3c24xx_driver_ids);
static const struct of_device_id s3c24xx_i2c_match[] = {
{ .compatible = "samsung,s3c2410-i2c", .data = (void *)0 },
{ .compatible = "samsung,s3c2440-i2c", .data = (void *)QUIRK_S3C2440 },
+ { .compatible = "samsung,s3c2440-hdmiphy-i2c",
+ .data = (void *)(QUIRK_S3C2440 | QUIRK_HDMIPHY | QUIRK_NO_GPIO) },
{},
};
MODULE_DEVICE_TABLE(of, s3c24xx_i2c_match);
unsigned long iicstat;
int timeout = 400;
+ /* the timeout for HDMIPHY is reduced to 10 ms because
+ * the hangup is expected to happen, so waiting 400 ms
+ * causes only unnecessary system hangup
+ */
+ if (i2c->quirks & QUIRK_HDMIPHY)
+ timeout = 10;
+
while (timeout-- > 0) {
iicstat = readl(i2c->regs + S3C2410_IICSTAT);
msleep(1);
}
+ /* hang-up of bus dedicated for HDMIPHY occurred, resetting */
+ if (i2c->quirks & QUIRK_HDMIPHY) {
+ writel(0, i2c->regs + S3C2410_IICCON);
+ writel(0, i2c->regs + S3C2410_IICSTAT);
+ writel(0, i2c->regs + S3C2410_IICDS);
+
+ return 0;
+ }
+
return -ETIMEDOUT;
}
/* declare our i2c functionality */
static u32 s3c24xx_i2c_func(struct i2c_adapter *adap)
{
- return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | I2C_FUNC_PROTOCOL_MANGLING;
+ return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | I2C_FUNC_NOSTART |
+ I2C_FUNC_PROTOCOL_MANGLING;
}
/* i2c bus registration info */
{
int idx, gpio, ret;
+ if (i2c->quirks & QUIRK_NO_GPIO)
+ return 0;
+
for (idx = 0; idx < 2; idx++) {
gpio = of_get_gpio(i2c->dev->of_node, idx);
if (!gpio_is_valid(gpio)) {
static void s3c24xx_i2c_dt_gpio_free(struct s3c24xx_i2c *i2c)
{
unsigned int idx;
+
+ if (i2c->quirks & QUIRK_NO_GPIO)
+ return;
+
for (idx = 0; idx < 2; idx++)
gpio_free(i2c->gpios[idx]);
}