Port of a Linux commit e44abfed6fcb750d24f4438dc9d5a02eebb5fcac
The read-only DBI registers can be written only when the "Write to RO
Registers Using DBI" (DBI_RO_WR_EN) field of MISC_CONTROL_1_OFF is set.
Add accessors to enable and disable write permission, and use them instead
of accessing MISC_CONTROL_1_OFF directly.
Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@xxxxxxx>
Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Acked-by: Joao Pinto <jpinto@xxxxxxxxxxxx>
Acked-by: Roy Zang <tie-fei.zang@xxxxxxxxxxxxx>
Signed-off-by: Andrey Smirnov <andrew.smirnov@xxxxxxxxx>
---
drivers/pci/pcie-designware.h | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
diff --git a/drivers/pci/pcie-designware.h b/drivers/pci/pcie-designware.h
index 10f64b101..26b1ada94 100644
--- a/drivers/pci/pcie-designware.h
+++ b/drivers/pci/pcie-designware.h
@@ -62,6 +62,9 @@
#define PCIE_ATU_FUNC(x) (((x) & 0x7) << 16)
#define PCIE_ATU_UPPER_TARGET 0x91C
+#define PCIE_MISC_CONTROL_1_OFF 0x8BC
+#define PCIE_DBI_RO_WR_EN (0x1 << 0)
+
/* PCIe Port Logic registers */
#define PLR_OFFSET 0x700
#define PCIE_PHY_DEBUG_R1 (PLR_OFFSET + 0x2c)
@@ -152,4 +155,27 @@ static inline u32 dw_pcie_readl_dbi(struct dw_pcie *pci, u32 reg)
{
return __dw_pcie_readl_dbi(pci, pci->dbi_base, reg, 0x4);
}
+
+static inline void dw_pcie_dbi_ro_wr_en(struct dw_pcie *pci)
+{
+ u32 reg;
+ u32 val;
+
+ reg = PCIE_MISC_CONTROL_1_OFF;
+ val = dw_pcie_readl_dbi(pci, reg);
+ val |= PCIE_DBI_RO_WR_EN;
+ dw_pcie_writel_dbi(pci, reg, val);
+}
+
+static inline void dw_pcie_dbi_ro_wr_dis(struct dw_pcie *pci)
+{
+ u32 reg;
+ u32 val;
+
+ reg = PCIE_MISC_CONTROL_1_OFF;
+ val = dw_pcie_readl_dbi(pci, reg);
+ val &= ~PCIE_DBI_RO_WR_EN;
+ dw_pcie_writel_dbi(pci, reg, val);
+}
+
#endif /* _PCIE_DESIGNWARE_H */
--
2.19.1
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