@@ -15,6 +15,7 @@
#include <mach/map.h>
#define S5P_PMUREG(x) (S5P_VA_PMU + (x))
+#define S5P_SYSREG(x) (S3C_VA_SYS + (x))
#define S5P_CENTRAL_SEQ_CONFIGURATION S5P_PMUREG(0x0200)
@@ -230,6 +231,7 @@
/* For EXYNOS5 */
+#define EXYNOS5_SYS_I2C_CFG S5P_SYSREG(0x0234)
#define EXYNOS5_USB_CFG S5P_PMUREG(0x0230)
#define EXYNOS5_AUTO_WDTRESET_DISABLE S5P_PMUREG(0x0408)
@@ -13,10 +13,12 @@
#include <linux/serial_core.h>
#include <linux/memblock.h>
#include <linux/of_fdt.h>
+#include <linux/io.h>
#include <asm/mach/arch.h>
#include <asm/hardware/gic.h>
#include <mach/map.h>
+#include <mach/regs-pmu.h>
#include <plat/cpu.h>
#include <plat/regs-serial.h>
@@ -97,6 +99,28 @@ static void __init exynos5250_dt_map_io(void)
static void __init exynos5250_dt_machine_init(void)
{
+ struct device_node *i2c_np;
+ const char *i2c_compat = "samsung,s3c2440-i2c";
+ unsigned int tmp;
+
+ /*
+ * Exynos5's legacy i2c controller and new high speed i2c
+ * controller have muxed interrupt sources. By default the
+ * interrupts for 4-channel HS-I2C controller are enabled.
+ * If node for first four channels of legacy i2c controller
+ * are available then re-configure the interrupts via the
+ * system register.
+ */
+ for_each_compatible_node(i2c_np, NULL, i2c_compat) {
+ if (of_device_is_available(i2c_np)) {
+ if (of_alias_get_id(i2c_np, "i2c") < 4) {
+ tmp = readl(EXYNOS5_SYS_I2C_CFG);
+ writel(tmp & ~(0x1 << of_alias_get_id(i2c_np, "i2c")),
+ EXYNOS5_SYS_I2C_CFG);
+ }
+ }
+ }
+
of_platform_populate(NULL, of_default_bus_match_table,
exynos5250_auxdata_lookup, NULL);
}
On Exynos5 we have a new high-speed i2c controller. The interrupt sources for the legacy and new controller are muxed and are controlled via the SYSCON I2C_CFG register. At reset the interrupt source is configured for the high-speed controller, to continue using the old i2c controller we need to modify the I2C_CFG register. Signed-off-by: Abhilash Kesavan <a.kesavan@samsung.com> --- arch/arm/mach-exynos/include/mach/regs-pmu.h | 2 ++ arch/arm/mach-exynos/mach-exynos5-dt.c | 24 ++++++++++++++++++++++++ 2 files changed, 26 insertions(+), 0 deletions(-)