diff options
| author | Abhilash Kesavan <a.kesavan@samsung.com> | 2012-11-20 18:20:38 +0900 |
|---|---|---|
| committer | Kukjin Kim <kgene.kim@samsung.com> | 2012-11-20 18:20:38 +0900 |
| commit | 7000fe8c7a072214d90ca1fc8189b25c30fdd918 (patch) | |
| tree | d021bc6eb796679665a59623da46cbdeb5394ff9 | |
| parent | 840ed42942cc1ebbda2ed55f4019673b537fc5de (diff) | |
ARM: EXYNOS: Setup legacy i2c controller interrupts
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>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
| -rw-r--r-- | arch/arm/mach-exynos/include/mach/regs-pmu.h | 2 | ||||
| -rw-r--r-- | arch/arm/mach-exynos/mach-exynos5-dt.c | 24 |
2 files changed, 26 insertions, 0 deletions
diff --git a/arch/arm/mach-exynos/include/mach/regs-pmu.h b/arch/arm/mach-exynos/include/mach/regs-pmu.h index d4e392b811a3..684625ad3f39 100644 --- a/arch/arm/mach-exynos/include/mach/regs-pmu.h +++ b/arch/arm/mach-exynos/include/mach/regs-pmu.h @@ -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) diff --git a/arch/arm/mach-exynos/mach-exynos5-dt.c b/arch/arm/mach-exynos/mach-exynos5-dt.c index db035374087e..f906f599a141 100644 --- a/arch/arm/mach-exynos/mach-exynos5-dt.c +++ b/arch/arm/mach-exynos/mach-exynos5-dt.c @@ -11,10 +11,12 @@ #include <linux/of_platform.h> #include <linux/serial_core.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> @@ -91,6 +93,28 @@ 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); } |