[PATCH V13 07/12] PCI: dwc: Add support to enable CDM register check

[Vidya Sagar <vidyas@nvidia.com>]

Add support to enable CDM (Configuration Dependent Module) register check
for any data corruption based on the device-tree flag 'snps,enable-cdm-check'.

Signed-off-by: Vidya Sagar <vidyas@nvidia.com>
Acked-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Reviewed-by: Thierry Reding <treding@nvidia.com>
---
V13:
* None

V12:
* None

V11:
* None

V10:
* None

V9:
* None

V8:
* None

V7:
* Changed "enable-cdm-check" to "snps,enable-cdm-check"

V6:
* None

V5:
* None

V4:
* None

V3:
* Changed code and commit description to reflect change in flag from
  'cdm-check' to 'enable-cdm-check'

V2:
* This is a new patch in v2 series

 drivers/pci/controller/dwc/pcie-designware.c | 7 +++++++
 drivers/pci/controller/dwc/pcie-designware.h | 9 +++++++++
 2 files changed, 16 insertions(+)

diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
index 181449e342f1..01f9227a5ade 100644
--- a/drivers/pci/controller/dwc/pcie-designware.c
+++ b/drivers/pci/controller/dwc/pcie-designware.c
@@ -546,4 +546,11 @@ void dw_pcie_setup(struct dw_pcie *pci)
 		break;
 	}
 	dw_pcie_writel_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL, val);
+
+	if (of_property_read_bool(np, "snps,enable-cdm-check")) {
+		val = dw_pcie_readl_dbi(pci, PCIE_PL_CHK_REG_CONTROL_STATUS);
+		val |= PCIE_PL_CHK_REG_CHK_REG_CONTINUOUS |
+		       PCIE_PL_CHK_REG_CHK_REG_START;
+		dw_pcie_writel_dbi(pci, PCIE_PL_CHK_REG_CONTROL_STATUS, val);
+	}
 }
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index 11c223471416..5a18e94e52c8 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -86,6 +86,15 @@
 #define PCIE_MISC_CONTROL_1_OFF		0x8BC
 #define PCIE_DBI_RO_WR_EN		BIT(0)
 
+#define PCIE_PL_CHK_REG_CONTROL_STATUS			0xB20
+#define PCIE_PL_CHK_REG_CHK_REG_START			BIT(0)
+#define PCIE_PL_CHK_REG_CHK_REG_CONTINUOUS		BIT(1)
+#define PCIE_PL_CHK_REG_CHK_REG_COMPARISON_ERROR	BIT(16)
+#define PCIE_PL_CHK_REG_CHK_REG_LOGIC_ERROR		BIT(17)
+#define PCIE_PL_CHK_REG_CHK_REG_COMPLETE		BIT(18)
+
+#define PCIE_PL_CHK_REG_ERR_ADDR			0xB28
+
 /*
  * iATU Unroll-specific register definitions
  * From 4.80 core version the address translation will be made by unroll
-- 
2.17.1