Add a user interface to check the core and cluster status on Exynos5420. This can be utilized while debugging mcpm issues. cat /dev/bL_status will show the current power status of all the 8 cores along with the cluster.
Signed-off-by: Thomas Abraham <[email protected]> Signed-off-by: Inderpal Singh <[email protected]> Signed-off-by: Andrew Bresticker <[email protected]> Signed-off-by: Abhilash Kesavan <[email protected]> --- arch/arm/mach-exynos/mcpm-exynos.c | 64 ++++++++++++++++++++++++++++++++++++ 1 file changed, 64 insertions(+) diff --git a/arch/arm/mach-exynos/mcpm-exynos.c b/arch/arm/mach-exynos/mcpm-exynos.c index 49b9031..6c74c82 100644 --- a/arch/arm/mach-exynos/mcpm-exynos.c +++ b/arch/arm/mach-exynos/mcpm-exynos.c @@ -293,6 +293,53 @@ static void __init exynos_mcpm_usage_count_init(void) cpu_use_count[cpu][cluster] = 1; } +static size_t bL_check_status(char *info) +{ + size_t len = 0; + int i; + + len += sprintf(&info[len], "\t0 1 2 3 L2\n"); + len += sprintf(&info[len], "[A15] "); + for (i = 0; i < 4; i++) { + len += sprintf(&info[len], "%d ", + (readl(EXYNOS_ARM_CORE_STATUS(i)) & 0x3) == 3 ? 1 : 0); + } + len += sprintf(&info[len], "%d\n", + (readl(EXYNOS_COMMON_STATUS(0)) & 0x3) == 3 ? 1 : 0); + + len += sprintf(&info[len], "[A7] "); + for (i = 4; i < 8; i++) + len += sprintf(&info[len], "%d ", + (readl(EXYNOS_ARM_CORE_STATUS(i)) & 0x3) == 3 ? 1 : 0); + len += sprintf(&info[len], "%d\n\n", + (readl(EXYNOS_COMMON_STATUS(1)) & 0x3) == 3 ? 1 : 0); + + return len; +} + +static ssize_t bL_status_read(struct file *file, char __user *buf, + size_t len, loff_t *pos) +{ + size_t count = 0; + char info[100]; + + count = bL_check_status(info); + if (count < 0) + return -EINVAL; + + return simple_read_from_buffer(buf, len, pos, info, count); +} + +static const struct file_operations bL_status_fops = { + .read = bL_status_read, +}; + +static struct miscdevice bL_status_device = { + MISC_DYNAMIC_MINOR, + "bL_status", + &bL_status_fops +}; + /* * Enable cluster-level coherency, in preparation for turning on the MMU. */ @@ -343,3 +390,20 @@ static int __init exynos_mcpm_init(void) } early_initcall(exynos_mcpm_init); + +static int __init exynos_bl_status_init(void) +{ + int ret; + + if (!soc_is_exynos5420()) + return -ENODEV; + + ret = misc_register(&bL_status_device); + if (ret) { + pr_info("bl_status not available\n"); + return ret; + } + return 0; +} + +late_initcall(exynos_bl_status_init); -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
