qcacld-3.0: Add PCIe register window lock related APIs

The register window needs to be configed properly before accessing
any larger than 4K range PCIe registers. Expose the lock in PLD to
avoid race condition when both platform and host drivers
try to config it.

Change-Id: Icd3df3d4d2cc2ecc3df608e7b767a3e654b94500
CRs-Fixed: 2549887

core/pld/inc/pld_common.h

@@ -623,6 +623,8 @@ int pld_get_ce_id(struct device *dev, int irq);
 int pld_get_irq(struct device *dev, int ce_id);
 void pld_lock_pm_sem(struct device *dev);
 void pld_release_pm_sem(struct device *dev);
+void pld_lock_reg_window(struct device *dev, unsigned long *flags);
+void pld_unlock_reg_window(struct device *dev, unsigned long *flags);
 int pld_power_on(struct device *dev);
 int pld_power_off(struct device *dev);
 int pld_athdiag_read(struct device *dev, uint32_t offset, uint32_t memtype,

core/pld/src/pld_common.c

@@ -1387,6 +1387,60 @@ void pld_release_pm_sem(struct device *dev)
 	}
 }
 
+/**
+ * pld_lock_reg_window() - Lock register window spinlock
+ * @dev: device pointer
+ * @flags: variable pointer to save CPU states
+ *
+ * It uses spinlock_bh so avoid calling in top half context.
+ *
+ * Return: void
+ */
+void pld_lock_reg_window(struct device *dev, unsigned long *flags)
+{
+	switch (pld_get_bus_type(dev)) {
+	case PLD_BUS_TYPE_PCIE:
+		pld_pcie_lock_reg_window(dev, flags);
+		break;
+	case PLD_BUS_TYPE_SNOC:
+		break;
+	case PLD_BUS_TYPE_SDIO:
+		break;
+	case PLD_BUS_TYPE_USB:
+		break;
+	default:
+		pr_err("Invalid device type\n");
+		break;
+	}
+}
+
+/**
+ * pld_unlock_reg_window() - Unlock register window spinlock
+ * @dev: device pointer
+ * @flags: variable pointer to save CPU states
+ *
+ * It uses spinlock_bh so avoid calling in top half context.
+ *
+ * Return: void
+ */
+void pld_unlock_reg_window(struct device *dev, unsigned long *flags)
+{
+	switch (pld_get_bus_type(dev)) {
+	case PLD_BUS_TYPE_PCIE:
+		pld_pcie_unlock_reg_window(dev, flags);
+		break;
+	case PLD_BUS_TYPE_SNOC:
+		break;
+	case PLD_BUS_TYPE_SDIO:
+		break;
+	case PLD_BUS_TYPE_USB:
+		break;
+	default:
+		pr_err("Invalid device type\n");
+		break;
+	}
+}
+
 /**
  * pld_power_on() - Power on WLAN hardware
  * @dev: device

core/pld/src/pld_pcie.h

@@ -283,6 +283,16 @@ static inline void pld_pcie_release_pm_sem(struct device *dev)
 {
 }
 
+static inline void pld_pcie_lock_reg_window(struct device *dev,
+					    unsigned long *flags)
+{
+}
+
+static inline void pld_pcie_unlock_reg_window(struct device *dev,
+					      unsigned long *flags)
+{
+}
+
 static inline int pld_pcie_power_on(struct device *dev)
 {
 	return 0;
@@ -503,6 +513,18 @@ static inline void pld_pcie_release_pm_sem(struct device *dev)
 	cnss_release_pm_sem(dev);
 }
 
+static inline void pld_pcie_lock_reg_window(struct device *dev,
+					    unsigned long *flags)
+{
+	cnss_pci_lock_reg_window(dev, flags);
+}
+
+static inline void pld_pcie_unlock_reg_window(struct device *dev,
+					      unsigned long *flags)
+{
+	cnss_pci_unlock_reg_window(dev, flags);
+}
+
 static inline int pld_pcie_power_on(struct device *dev)
 {
 	return cnss_power_up(dev);