linux-kernel - [PATCH v1 1/6] intel_pmc_core: Fix PWRMBASE mask and mmio reg len

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Date:   Fri,  7 Oct 2016 16:01:12 +0530
From:   Rajneesh Bhardwaj <rajneesh.bhardwaj@...el.com>
To:     platform-driver-x86@...r.kernel.org
Cc:     dvhart@...radead.org, andriy.shevchenko@...ux.intel.com,
        linux-kernel@...r.kernel.org,
        Rajneesh Bhardwaj <rajneesh.bhardwaj@...el.com>
Subject: [PATCH v1 1/6] intel_pmc_core: Fix PWRMBASE mask and mmio reg len

On Sunrise Point PCH, the Power Management Controller provides 4K bytes of
memory space for various power management and debug registers. This fix is
needed to access power management & debug registers that are mapped at a
higher offset.

Also, this provides a fix for correctly masking the PWRMBASE as the initial
bits (0-11) are reserved.

Signed-off-by: Rajneesh Bhardwaj <rajneesh.bhardwaj@...el.com>
---
 drivers/platform/x86/intel_pmc_core.c | 1 +
 drivers/platform/x86/intel_pmc_core.h | 3 ++-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/platform/x86/intel_pmc_core.c b/drivers/platform/x86/intel_pmc_core.c
index 520b58a..fcb0643 100644
--- a/drivers/platform/x86/intel_pmc_core.c
+++ b/drivers/platform/x86/intel_pmc_core.c
@@ -149,6 +149,7 @@ static int pmc_core_probe(struct pci_dev *dev, const struct pci_device_id *id)
 		dev_dbg(&dev->dev, "PMC Core: failed to read PCI config space.\n");
 		return err;
 	}
+	pmcdev->base_addr &= PMC_BASE_ADDR_MASK;
 	dev_dbg(&dev->dev, "PMC Core: PWRMBASE is %#x\n", pmcdev->base_addr);
 
 	pmcdev->regbase = devm_ioremap_nocache(ptr_dev,
diff --git a/drivers/platform/x86/intel_pmc_core.h b/drivers/platform/x86/intel_pmc_core.h
index e3f671f..cde31ec 100644
--- a/drivers/platform/x86/intel_pmc_core.h
+++ b/drivers/platform/x86/intel_pmc_core.h
@@ -26,8 +26,9 @@
 
 #define SPT_PMC_BASE_ADDR_OFFSET		0x48
 #define SPT_PMC_SLP_S0_RES_COUNTER_OFFSET	0x13c
-#define SPT_PMC_MMIO_REG_LEN			0x100
+#define SPT_PMC_MMIO_REG_LEN			0x1000
 #define SPT_PMC_SLP_S0_RES_COUNTER_STEP		0x64
+#define PMC_BASE_ADDR_MASK			~(SPT_PMC_MMIO_REG_LEN - 1)
 
 /**
  * struct pmc_dev - pmc device structure
-- 
1.9.1