ath11k: pci: add MSI config initialisation

QCA6390 uses PCI MSI for CE/MHI/DP interrupt.  Add MSI vector mapping and MSI
enable/disable operations.

Tested-on: QCA6390 hw2.0 PCI WLAN.HST.1.0.1-01740-QCAHSTSWPLZ_V2_TO_X86-1
Tested-on: IPQ8074 hw2.0 AHB WLAN.HK.2.1.0.1-01238-QCAHKSWPL_SILICONZ-2
Signed-off-by: Govind Singh <govinds@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/1597309466-19688-7-git-send-email-kvalo@codeaurora.org

drivers/net/wireless/ath/ath11k/debug.h

@@ -25,6 +25,7 @@ enum ath11k_debug_mask {
 	ATH11K_DBG_REG		= 0x00000200,
 	ATH11K_DBG_TESTMODE	= 0x00000400,
 	ATH11k_DBG_HAL		= 0x00000800,
+	ATH11K_DBG_PCI		= 0x00001000,
 	ATH11K_DBG_ANY		= 0xffffffff,
 };
 

drivers/net/wireless/ath/ath11k/pci.c

@@ -4,6 +4,7 @@
  */
 
 #include <linux/module.h>
+#include <linux/msi.h>
 #include <linux/pci.h>
 
 #include "pci.h"
@@ -22,6 +23,62 @@ static const struct pci_device_id ath11k_pci_id_table[] = {
 
 MODULE_DEVICE_TABLE(pci, ath11k_pci_id_table);
 
+static const struct ath11k_msi_config msi_config = {
+	.total_vectors = 32,
+	.total_users = 4,
+	.users = (struct ath11k_msi_user[]) {
+		{ .name = "MHI", .num_vectors = 3, .base_vector = 0 },
+		{ .name = "CE", .num_vectors = 10, .base_vector = 3 },
+		{ .name = "WAKE", .num_vectors = 1, .base_vector = 13 },
+		{ .name = "DP", .num_vectors = 18, .base_vector = 14 },
+	},
+};
+
+static int ath11k_pci_enable_msi(struct ath11k_pci *ab_pci)
+{
+	struct ath11k_base *ab = ab_pci->ab;
+	struct msi_desc *msi_desc;
+	int num_vectors;
+	int ret;
+
+	num_vectors = pci_alloc_irq_vectors(ab_pci->pdev,
+					    msi_config.total_vectors,
+					    msi_config.total_vectors,
+					    PCI_IRQ_MSI);
+	if (num_vectors != msi_config.total_vectors) {
+		ath11k_err(ab, "failed to get %d MSI vectors, only %d available",
+			   msi_config.total_vectors, num_vectors);
+
+		if (num_vectors >= 0)
+			return -EINVAL;
+		else
+			return num_vectors;
+	}
+
+	msi_desc = irq_get_msi_desc(ab_pci->pdev->irq);
+	if (!msi_desc) {
+		ath11k_err(ab, "msi_desc is NULL!\n");
+		ret = -EINVAL;
+		goto free_msi_vector;
+	}
+
+	ab_pci->msi_ep_base_data = msi_desc->msg.data;
+
+	ath11k_dbg(ab, ATH11K_DBG_PCI, "msi base data is %d\n", ab_pci->msi_ep_base_data);
+
+	return 0;
+
+free_msi_vector:
+	pci_free_irq_vectors(ab_pci->pdev);
+
+	return ret;
+}
+
+static void ath11k_pci_disable_msi(struct ath11k_pci *ab_pci)
+{
+	pci_free_irq_vectors(ab_pci->pdev);
+}
+
 static int ath11k_pci_claim(struct ath11k_pci *ab_pci, struct pci_dev *pdev)
 {
 	struct ath11k_base *ab = ab_pci->ab;
@@ -136,6 +193,7 @@ static int ath11k_pci_probe(struct pci_dev *pdev,
 	ab_pci = ath11k_pci_priv(ab);
 	ab_pci->dev_id = pci_dev->device;
 	ab_pci->ab = ab;
+	ab_pci->pdev = pdev;
 	pci_set_drvdata(pdev, ab);
 
 	ret = ath11k_pci_claim(ab_pci, pdev);
@@ -144,10 +202,20 @@ static int ath11k_pci_probe(struct pci_dev *pdev,
 		goto err_free_core;
 	}
 
+	ret = ath11k_pci_enable_msi(ab_pci);
+	if (ret) {
+		ath11k_err(ab, "failed to enable msi: %d\n", ret);
+		goto err_pci_free_region;
+	}
+
 	return 0;
 
+err_pci_free_region:
+	ath11k_pci_free_region(ab_pci);
+
 err_free_core:
 	ath11k_core_free(ab);
+
 	return ret;
 }
 
@@ -157,6 +225,7 @@ static void ath11k_pci_remove(struct pci_dev *pdev)
 	struct ath11k_pci *ab_pci = ath11k_pci_priv(ab);
 
 	set_bit(ATH11K_FLAG_UNREGISTERING, &ab->dev_flags);
+	ath11k_pci_disable_msi(ab_pci);
 	ath11k_pci_free_region(ab_pci);
 	ath11k_core_free(ab);
 }

drivers/net/wireless/ath/ath11k/pci.h

@@ -5,10 +5,23 @@
 
 #include "core.h"
 
+struct ath11k_msi_user {
+	char *name;
+	int num_vectors;
+	u32 base_vector;
+};
+
+struct ath11k_msi_config {
+	int total_vectors;
+	int total_users;
+	struct ath11k_msi_user *users;
+};
+
 struct ath11k_pci {
 	struct pci_dev *pdev;
 	struct ath11k_base *ab;
 	u16 dev_id;
+	u32 msi_ep_base_data;
 };
 
 static inline struct ath11k_pci *ath11k_pci_priv(struct ath11k_base *ab)