From 9c916549c0345a054431abdc4f2d9ba48e856f80 Mon Sep 17 00:00:00 2001 From: "Chakravarty, Souvik K" Date: Fri, 24 Nov 2017 19:04:41 +0530 Subject: platform/x86: intel_pmc_ipc: Add read64 API Add intel_pmc_gcr_read64() API for reading from 64-bit GCR registers. This API will be called from intel_telemetry. Update description of intel_pmc_gcr_read(). Signed-off-by: Souvik Kumar Chakravarty Signed-off-by: Andy Shevchenko --- drivers/platform/x86/intel_pmc_ipc.c | 33 +++++++++++++++++++++++++++++++-- 1 file changed, 31 insertions(+), 2 deletions(-) (limited to 'drivers') diff --git a/drivers/platform/x86/intel_pmc_ipc.c b/drivers/platform/x86/intel_pmc_ipc.c index e03fa31446ca..e7edc8c63936 100644 --- a/drivers/platform/x86/intel_pmc_ipc.c +++ b/drivers/platform/x86/intel_pmc_ipc.c @@ -215,11 +215,11 @@ static inline int is_gcr_valid(u32 offset) } /** - * intel_pmc_gcr_read() - Read PMC GCR register + * intel_pmc_gcr_read() - Read a 32-bit PMC GCR register * @offset: offset of GCR register from GCR address base * @data: data pointer for storing the register output * - * Reads the PMC GCR register of given offset. + * Reads the 32-bit PMC GCR register at given offset. * * Return: negative value on error or 0 on success. */ @@ -243,6 +243,35 @@ int intel_pmc_gcr_read(u32 offset, u32 *data) } EXPORT_SYMBOL_GPL(intel_pmc_gcr_read); +/** + * intel_pmc_gcr_read64() - Read a 64-bit PMC GCR register + * @offset: offset of GCR register from GCR address base + * @data: data pointer for storing the register output + * + * Reads the 64-bit PMC GCR register at given offset. + * + * Return: negative value on error or 0 on success. + */ +int intel_pmc_gcr_read64(u32 offset, u64 *data) +{ + int ret; + + spin_lock(&ipcdev.gcr_lock); + + ret = is_gcr_valid(offset); + if (ret < 0) { + spin_unlock(&ipcdev.gcr_lock); + return ret; + } + + *data = readq(ipcdev.gcr_mem_base + offset); + + spin_unlock(&ipcdev.gcr_lock); + + return 0; +} +EXPORT_SYMBOL_GPL(intel_pmc_gcr_read64); + /** * intel_pmc_gcr_write() - Write PMC GCR register * @offset: offset of GCR register from GCR address base -- cgit v1.2.3