[PATCH 05/10] ath11k: pci: setup resources

[Kalle Valo <kvalo@codeaurora.org>]

From: Govind Singh <govinds@codeaurora.org>

Add support for setting up pci region and dma mask.

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>
---
 drivers/net/wireless/ath/ath11k/pci.c | 106 +++++++++++++++++++++++++++++++++-
 drivers/net/wireless/ath/ath11k/pci.h |  17 ++++++
 2 files changed, 122 insertions(+), 1 deletion(-)
 create mode 100644 drivers/net/wireless/ath/ath11k/pci.h

diff --git a/drivers/net/wireless/ath/ath11k/pci.c b/drivers/net/wireless/ath/ath11k/pci.c
index a88536d2c64b..9b1baf53ac5a 100644
--- a/drivers/net/wireless/ath/ath11k/pci.c
+++ b/drivers/net/wireless/ath/ath11k/pci.c
@@ -6,9 +6,13 @@
 #include <linux/module.h>
 #include <linux/pci.h>
 
+#include "pci.h"
 #include "core.h"
 #include "debug.h"
 
+#define ATH11K_PCI_BAR_NUM		0
+#define ATH11K_PCI_DMA_MASK		32
+
 #define QCA6390_DEVICE_ID		0x1101
 
 static const struct pci_device_id ath11k_pci_id_table[] = {
@@ -18,11 +22,95 @@ static const struct pci_device_id ath11k_pci_id_table[] = {
 
 MODULE_DEVICE_TABLE(pci, ath11k_pci_id_table);
 
+static int ath11k_pci_claim(struct ath11k_pci *ab_pci, struct pci_dev *pdev)
+{
+	struct ath11k_base *ab = ab_pci->ab;
+	u16 device_id;
+	int ret = 0;
+
+	pci_read_config_word(pdev, PCI_DEVICE_ID, &device_id);
+	if (device_id != ab_pci->dev_id)  {
+		ath11k_err(ab, "pci device id mismatch: 0x%x 0x%x\n",
+			   device_id, ab_pci->dev_id);
+		ret = -EIO;
+		goto out;
+	}
+
+	ret = pci_assign_resource(pdev, ATH11K_PCI_BAR_NUM);
+	if (ret) {
+		ath11k_err(ab, "failed to assign pci resource: %d\n", ret);
+		goto out;
+	}
+
+	ret = pci_enable_device(pdev);
+	if (ret) {
+		ath11k_err(ab, "failed to enable pci device: %d\n", ret);
+		goto out;
+	}
+
+	ret = pci_request_region(pdev, ATH11K_PCI_BAR_NUM, "ath11k_pci");
+	if (ret) {
+		ath11k_err(ab, "failed to request pci region: %d\n", ret);
+		goto disable_device;
+	}
+
+	ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(ATH11K_PCI_DMA_MASK));
+	if (ret) {
+		ath11k_err(ab, "failed to set pci dma mask to %d: %d\n",
+			   ATH11K_PCI_DMA_MASK, ret);
+		goto release_region;
+	}
+
+	ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(ATH11K_PCI_DMA_MASK));
+	if (ret) {
+		ath11k_err(ab, "failed to set pci consistent dma mask to %d: %d\n",
+			   ATH11K_PCI_DMA_MASK, ret);
+		goto release_region;
+	}
+
+	pci_set_master(pdev);
+
+	ab->mem_len = pci_resource_len(pdev, ATH11K_PCI_BAR_NUM);
+	ab->mem = pci_iomap(pdev, ATH11K_PCI_BAR_NUM, 0);
+	if (!ab->mem) {
+		ath11k_err(ab, "failed to map pci bar %d\n", ATH11K_PCI_BAR_NUM);
+		ret = -EIO;
+		goto clear_master;
+	}
+
+	ath11k_dbg(ab, ATH11K_DBG_BOOT, "boot pci_mem 0x%pK\n", ab->mem);
+	return 0;
+
+clear_master:
+	pci_clear_master(pdev);
+release_region:
+	pci_release_region(pdev, ATH11K_PCI_BAR_NUM);
+disable_device:
+	pci_disable_device(pdev);
+out:
+	return ret;
+}
+
+static void ath11k_pci_free_region(struct ath11k_pci *ab_pci)
+{
+	struct ath11k_base *ab = ab_pci->ab;
+	struct pci_dev *pci_dev = ab_pci->pdev;
+
+	pci_iounmap(pci_dev, ab->mem);
+	ab->mem = NULL;
+	pci_clear_master(pci_dev);
+	pci_release_region(pci_dev, ATH11K_PCI_BAR_NUM);
+	if (pci_is_enabled(pci_dev))
+		pci_disable_device(pci_dev);
+}
+
 static int ath11k_pci_probe(struct pci_dev *pdev,
 			    const struct pci_device_id *pci_dev)
 {
 	struct ath11k_base *ab;
+	struct ath11k_pci *ab_pci;
 	enum ath11k_hw_rev hw_rev;
+	int ret;
 
 	dev_warn(&pdev->dev, "WARNING: ath11k PCI support is experimental!\n");
 
@@ -36,7 +124,7 @@ static int ath11k_pci_probe(struct pci_dev *pdev,
 		return -ENOTSUPP;
 	}
 
-	ab = ath11k_core_alloc(&pdev->dev, 0, ATH11K_BUS_PCI);
+	ab = ath11k_core_alloc(&pdev->dev, sizeof(*ab_pci), ATH11K_BUS_PCI);
 	if (!ab) {
 		dev_err(&pdev->dev, "failed to allocate ath11k base\n");
 		return -ENOMEM;
@@ -45,15 +133,31 @@ static int ath11k_pci_probe(struct pci_dev *pdev,
 	ab->dev = &pdev->dev;
 	ab->hw_rev = hw_rev;
 	pci_set_drvdata(pdev, ab);
+	ab_pci = ath11k_pci_priv(ab);
+	ab_pci->dev_id = pci_dev->device;
+	ab_pci->ab = ab;
+	pci_set_drvdata(pdev, ab);
+
+	ret = ath11k_pci_claim(ab_pci, pdev);
+	if (ret) {
+		ath11k_err(ab, "failed to claim device: %d\n", ret);
+		goto err_free_core;
+	}
 
 	return 0;
+
+err_free_core:
+	ath11k_core_free(ab);
+	return ret;
 }
 
 static void ath11k_pci_remove(struct pci_dev *pdev)
 {
 	struct ath11k_base *ab = pci_get_drvdata(pdev);
+	struct ath11k_pci *ab_pci = ath11k_pci_priv(ab);
 
 	set_bit(ATH11K_FLAG_UNREGISTERING, &ab->dev_flags);
+	ath11k_pci_free_region(ab_pci);
 	ath11k_core_free(ab);
 }
 
diff --git a/drivers/net/wireless/ath/ath11k/pci.h b/drivers/net/wireless/ath/ath11k/pci.h
new file mode 100644
index 000000000000..dfd30ec09818
--- /dev/null
+++ b/drivers/net/wireless/ath/ath11k/pci.h
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: BSD-3-Clause-Clear */
+/*
+ * Copyright (c) 2019-2020 The Linux Foundation. All rights reserved.
+ */
+
+#include "core.h"
+
+struct ath11k_pci {
+	struct pci_dev *pdev;
+	struct ath11k_base *ab;
+	u16 dev_id;
+};
+
+static inline struct ath11k_pci *ath11k_pci_priv(struct ath11k_base *ab)
+{
+	return (struct ath11k_pci *)ab->drv_priv;
+}
-- 
2.7.4


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