[RFC PATCH 2/8] qaic: Add and init a basic mhi controller

[Jeffrey Hugo]

An mhi controller is the "driver" for a specific mhi device with the mhi
bus framework.  Add a basic controller for the AIC100 device, and
supporting code to init the controller.  This will enable the PCIE device,
init the mhi hardware, bring it to ready state, and use BHI to load the
SBL image.

Signed-off-by: Jeffrey Hugo <jhugo@xxxxxxxxxxxxxx>
---
 drivers/misc/qaic/Makefile         |   4 +-
 drivers/misc/qaic/mhi_controller.c | 495 +++++++++++++++++++++++++++++++++++++
 drivers/misc/qaic/mhi_controller.h |  14 ++
 drivers/misc/qaic/qaic.h           |  18 ++
 drivers/misc/qaic/qaic_drv.c       | 110 +++++++++
 5 files changed, 639 insertions(+), 2 deletions(-)
 create mode 100644 drivers/misc/qaic/mhi_controller.c
 create mode 100644 drivers/misc/qaic/mhi_controller.h
 create mode 100644 drivers/misc/qaic/qaic.h

diff --git a/drivers/misc/qaic/Makefile b/drivers/misc/qaic/Makefile
index 42149ac..b5fd819 100644
--- a/drivers/misc/qaic/Makefile
+++ b/drivers/misc/qaic/Makefile
@@ -3,8 +3,8 @@
 # Makefile for Qualcomm Cloud AI 100 accelerators driver
 #
 
-
 obj-$(CONFIG_QAIC)	:= qaic.o
 
 qaic-y := \
-	qaic_drv.o
+	qaic_drv.o \
+	mhi_controller.o
diff --git a/drivers/misc/qaic/mhi_controller.c b/drivers/misc/qaic/mhi_controller.c
new file mode 100644
index 0000000..ba4808c
--- /dev/null
+++ b/drivers/misc/qaic/mhi_controller.c
@@ -0,0 +1,495 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+/* Copyright (c) 2019-2020, The Linux Foundation. All rights reserved. */
+
+#include <linux/err.h>
+#include <linux/mhi.h>
+#include <linux/moduleparam.h>
+#include <linux/pci.h>
+
+static unsigned int mhi_timeout = 20000; /* 20 sec default */
+module_param(mhi_timeout, uint, 0600);
+
+static struct mhi_channel_config aic100_channels[] = {
+	{
+		.name = "QAIC_LOOPBACK",
+		.num = 0,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_TO_DEVICE,
+		.type = MHI_CH_TYPE_INBOUND,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.auto_queue = false,
+		.auto_start = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_LOOPBACK",
+		.num = 1,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_FROM_DEVICE,
+		.type = MHI_CH_TYPE_OUTBOUND,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.auto_queue = false,
+		.auto_start = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_SAHARA",
+		.num = 2,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_TO_DEVICE,
+		.type = MHI_CH_TYPE_INBOUND,
+		.ee_mask = MHI_CH_EE_SBL,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.auto_queue = false,
+		.auto_start = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_SAHARA",
+		.num = 3,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_FROM_DEVICE,
+		.type = MHI_CH_TYPE_OUTBOUND,
+		.ee_mask = MHI_CH_EE_SBL,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.auto_queue = false,
+		.auto_start = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_DIAG",
+		.num = 4,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_TO_DEVICE,
+		.type = MHI_CH_TYPE_INBOUND,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.auto_queue = false,
+		.auto_start = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_DIAG",
+		.num = 5,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_FROM_DEVICE,
+		.type = MHI_CH_TYPE_OUTBOUND,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.auto_queue = false,
+		.auto_start = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_SSR",
+		.num = 6,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_TO_DEVICE,
+		.type = MHI_CH_TYPE_INBOUND,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.auto_queue = false,
+		.auto_start = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_SSR",
+		.num = 7,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_FROM_DEVICE,
+		.type = MHI_CH_TYPE_OUTBOUND,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.auto_queue = false,
+		.auto_start = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_QDSS",
+		.num = 8,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_TO_DEVICE,
+		.type = MHI_CH_TYPE_INBOUND,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.auto_queue = false,
+		.auto_start = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_QDSS",
+		.num = 9,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_FROM_DEVICE,
+		.type = MHI_CH_TYPE_OUTBOUND,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.auto_queue = false,
+		.auto_start = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_CONTROL",
+		.num = 10,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_TO_DEVICE,
+		.type = MHI_CH_TYPE_INBOUND,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.auto_queue = false,
+		.auto_start = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_CONTROL",
+		.num = 11,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_FROM_DEVICE,
+		.type = MHI_CH_TYPE_OUTBOUND,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.auto_queue = false,
+		.auto_start = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_LOGGING",
+		.num = 12,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_TO_DEVICE,
+		.type = MHI_CH_TYPE_INBOUND,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.auto_queue = false,
+		.auto_start = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_LOGGING",
+		.num = 13,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_FROM_DEVICE,
+		.type = MHI_CH_TYPE_OUTBOUND,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.auto_queue = false,
+		.auto_start = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_STATUS",
+		.num = 14,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_TO_DEVICE,
+		.type = MHI_CH_TYPE_INBOUND,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.auto_queue = false,
+		.auto_start = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_STATUS",
+		.num = 15,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_FROM_DEVICE,
+		.type = MHI_CH_TYPE_OUTBOUND,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.auto_queue = false,
+		.auto_start = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_TELEMETRY",
+		.num = 16,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_TO_DEVICE,
+		.type = MHI_CH_TYPE_INBOUND,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.auto_queue = false,
+		.auto_start = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_TELEMETRY",
+		.num = 17,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_FROM_DEVICE,
+		.type = MHI_CH_TYPE_OUTBOUND,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.auto_queue = false,
+		.auto_start = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_DEBUG",
+		.num = 18,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_TO_DEVICE,
+		.type = MHI_CH_TYPE_INBOUND,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.auto_queue = false,
+		.auto_start = false,
+		.wake_capable = false,
+	},
+	{
+		.name = "QAIC_DEBUG",
+		.num = 19,
+		.num_elements = 32,
+		.local_elements = 0,
+		.event_ring = 0,
+		.dir = DMA_FROM_DEVICE,
+		.type = MHI_CH_TYPE_OUTBOUND,
+		.ee_mask = MHI_CH_EE_AMSS,
+		.pollcfg = 0,
+		.doorbell = MHI_DB_BRST_DISABLE,
+		.lpm_notify = false,
+		.offload_channel = false,
+		.doorbell_mode_switch = false,
+		.auto_queue = false,
+		.auto_start = false,
+		.wake_capable = false,
+	},
+};
+
+static struct mhi_event_config aic100_events[] = {
+	{
+		.num_elements = 32,
+		.irq_moderation_ms = 0,
+		.irq = 0,
+		.channel = 0,
+		.priority = 1,
+		.mode = MHI_DB_BRST_DISABLE,
+		.data_type = MHI_ER_CTRL,
+		.hardware_event = false,
+		.client_managed = false,
+		.offload_channel = false,
+	},
+};
+
+static struct mhi_controller_config aic100_config = {
+	.max_channels = 128,
+	.timeout_ms = 0, /* controlled by mhi_timeout */
+	.buf_len = 0,
+	.num_channels = ARRAY_SIZE(aic100_channels),
+	.ch_cfg = aic100_channels,
+	.num_events = ARRAY_SIZE(aic100_events),
+	.event_cfg = aic100_events,
+	.use_bounce_buf = false,
+	.m2_no_db = false,
+};
+
+static int mhi_link_status(struct mhi_controller *mhi_cntl)
+{
+	struct pci_dev *pci_dev = to_pci_dev(mhi_cntl->cntrl_dev);
+	u16 dev_id;
+	int ret;
+
+	/* try reading device id, if dev id don't match, link is down */
+	ret = pci_read_config_word(pci_dev, PCI_DEVICE_ID, &dev_id);
+
+	return (ret || dev_id != pci_dev->device) ? -EIO : 0;
+}
+
+static int mhi_runtime_get(struct mhi_controller *mhi_cntl)
+{
+	return 0;
+}
+
+static void mhi_runtime_put(struct mhi_controller *mhi_cntl)
+{
+}
+
+static void mhi_status_cb(struct mhi_controller *mhi_cntl,
+			  enum mhi_callback reason)
+{
+}
+
+struct mhi_controller *qaic_mhi_register_controller(struct pci_dev *pci_dev,
+						    void *mhi_bar,
+						    int mhi_irq)
+{
+	struct mhi_controller *mhi_cntl;
+	int ret;
+
+	pci_dbg(pci_dev, "%s\n", __func__);
+
+	mhi_cntl = kzalloc(sizeof(*mhi_cntl), GFP_KERNEL);
+	if (!mhi_cntl)
+		return ERR_PTR(-ENOMEM);
+
+	mhi_cntl->cntrl_dev = &pci_dev->dev;
+
+	/*
+	 * Covers the entire possible physical ram region.  Remote side is
+	 * going to calculate a size of this range, so subtract 1 to prevent
+	 * rollover.
+	 */
+	mhi_cntl->iova_start = 0;
+	mhi_cntl->iova_stop = U64_MAX - 1;
+
+	mhi_cntl->status_cb = mhi_status_cb;
+	mhi_cntl->runtime_get = mhi_runtime_get;
+	mhi_cntl->runtime_put = mhi_runtime_put;
+	mhi_cntl->link_status = mhi_link_status;
+	mhi_cntl->regs = mhi_bar;
+	mhi_cntl->nr_irqs = 1;
+	mhi_cntl->irq = kmalloc(sizeof(*mhi_cntl->irq), GFP_KERNEL);
+
+	if (!mhi_cntl->irq)
+		return ERR_PTR(-ENOMEM);
+
+	mhi_cntl->irq[0] = mhi_irq;
+
+	mhi_cntl->fw_image = "qcom/aic100/sbl.bin";
+
+	/* use latest configured timeout */
+	aic100_config.timeout_ms = mhi_timeout;
+	ret = mhi_register_controller(mhi_cntl, &aic100_config);
+	if (ret) {
+		pci_err(pci_dev, "register_mhi_controller failed %d\n", ret);
+		kfree(mhi_cntl->irq);
+		kfree(mhi_cntl);
+		return ERR_PTR(ret);
+	}
+
+	ret = mhi_async_power_up(mhi_cntl);
+	if (ret) {
+		pci_err(pci_dev, "mhi_async_power_up failed %d\n", ret);
+		mhi_unregister_controller(mhi_cntl);
+		kfree(mhi_cntl->irq);
+		kfree(mhi_cntl);
+		return ERR_PTR(ret);
+	}
+
+	return mhi_cntl;
+}
+
+void qaic_mhi_free_controller(struct mhi_controller *mhi_cntl, bool link_up)
+{
+	mhi_power_down(mhi_cntl, link_up);
+	mhi_unregister_controller(mhi_cntl);
+	kfree(mhi_cntl->irq);
+	kfree(mhi_cntl);
+}
diff --git a/drivers/misc/qaic/mhi_controller.h b/drivers/misc/qaic/mhi_controller.h
new file mode 100644
index 0000000..c81725e
--- /dev/null
+++ b/drivers/misc/qaic/mhi_controller.h
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0-only
+ *
+ * Copyright (c) 2019-2020, The Linux Foundation. All rights reserved.
+ */
+
+#ifndef MHICONTROLLERQAIC_H_
+#define MHICONTROLLERQAIC_H_
+
+struct mhi_controller *qaic_mhi_register_controller(struct pci_dev *pci_dev,
+						    void *mhi_bar,
+						    int mhi_irq);
+
+void qaic_mhi_free_controller(struct mhi_controller *mhi_cntl, bool link_up);
+#endif /* MHICONTROLLERQAIC_H_ */
diff --git a/drivers/misc/qaic/qaic.h b/drivers/misc/qaic/qaic.h
new file mode 100644
index 0000000..379aa82
--- /dev/null
+++ b/drivers/misc/qaic/qaic.h
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0-only
+ *
+ * Copyright (c) 2019-2020, The Linux Foundation. All rights reserved.
+ */
+
+#ifndef QAICINTERNAL_H_
+#define QAICINTERNAL_H_
+
+#include <linux/mhi.h>
+#include <linux/pci.h>
+
+struct qaic_device {
+	struct pci_dev		*pdev;
+	int			bars;
+	void __iomem		*bar_0;
+	struct mhi_controller	*mhi_cntl;
+};
+#endif /* QAICINTERNAL_H_ */
diff --git a/drivers/misc/qaic/qaic_drv.c b/drivers/misc/qaic/qaic_drv.c
index addd9ea..b624daa 100644
--- a/drivers/misc/qaic/qaic_drv.c
+++ b/drivers/misc/qaic/qaic_drv.c
@@ -3,24 +3,131 @@
 /* Copyright (c) 2019-2020, The Linux Foundation. All rights reserved. */
 
 #include <linux/module.h>
+#include <linux/msi.h>
 #include <linux/pci.h>
 #include <linux/pci_ids.h>
 
+#include "mhi_controller.h"
+#include "qaic.h"
+
 #define PCI_DEV_AIC100			0xa100
 
 #define QAIC_NAME			"Qualcomm Cloud AI 100"
 
+static bool link_up;
+
 static int qaic_pci_probe(struct pci_dev *pdev,
 			  const struct pci_device_id *id)
 {
+	int ret;
+	int mhi_irq;
+	struct qaic_device *qdev;
+
 	pci_dbg(pdev, "%s\n", __func__);
+
+	qdev = kzalloc(sizeof(*qdev), GFP_KERNEL);
+	if (!qdev) {
+		ret = -ENOMEM;
+		goto qdev_fail;
+	}
+
+	pci_set_drvdata(pdev, qdev);
+	qdev->pdev = pdev;
+
+	qdev->bars = pci_select_bars(pdev, IORESOURCE_MEM);
+
+	/* make sure the device has the expected BARs */
+	if (qdev->bars != (BIT(0) | BIT(2) | BIT(4))) {
+		pci_err(pdev, "%s: expected BARs 0, 2, and 4 not found in device.  Found 0x%x\n", __func__, qdev->bars);
+		ret = -EINVAL;
+		goto bar_fail;
+	}
+
+	ret = pci_enable_device(pdev);
+	if (ret)
+		goto enable_fail;
+
+	ret = pci_request_selected_regions(pdev, qdev->bars, "aic100");
+	if (ret)
+		goto request_regions_fail;
+
+	pci_set_master(pdev);
+
+	ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
+	if (ret)
+		goto dma_mask_fail;
+	ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
+	if (ret)
+		goto dma_mask_fail;
+
+	qdev->bar_0 = pci_ioremap_bar(pdev, 0);
+	if (!qdev->bar_0) {
+		ret = -ENOMEM;
+		goto ioremap_0_fail;
+	}
+
+	ret = pci_alloc_irq_vectors(pdev, 1, 32, PCI_IRQ_MSI);
+	if (ret < 0)
+		goto alloc_irq_fail;
+
+	if (ret < 32) {
+		pci_err(pdev, "%s: Requested 32 MSIs.  Obtained %d MSIs which is less than the 32 required.\n", __func__, ret);
+		ret = -ENODEV;
+		goto invalid_msi_config;
+	}
+
+	mhi_irq = pci_irq_vector(pdev, 0);
+	if (mhi_irq < 0) {
+		ret = mhi_irq;
+		goto get_mhi_irq_fail;
+	}
+
+	qdev->mhi_cntl = qaic_mhi_register_controller(pdev, qdev->bar_0,
+						      mhi_irq);
+	if (IS_ERR(qdev->mhi_cntl)) {
+		ret = PTR_ERR(qdev->mhi_cntl);
+		goto mhi_register_fail;
+	}
+
 	pci_dbg(pdev, "%s: successful init\n", __func__);
 	return 0;
+
+mhi_register_fail:
+get_mhi_irq_fail:
+invalid_msi_config:
+	pci_free_irq_vectors(pdev);
+alloc_irq_fail:
+	iounmap(qdev->bar_0);
+ioremap_0_fail:
+dma_mask_fail:
+	pci_clear_master(pdev);
+	pci_release_selected_regions(pdev, qdev->bars);
+request_regions_fail:
+	pci_disable_device(pdev);
+enable_fail:
+	pci_set_drvdata(pdev, NULL);
+bar_fail:
+	kfree(qdev);
+qdev_fail:
+	return ret;
 }
 
 static void qaic_pci_remove(struct pci_dev *pdev)
 {
+	struct qaic_device *qdev = pci_get_drvdata(pdev);
+
 	pci_dbg(pdev, "%s\n", __func__);
+	if (!qdev)
+		return;
+
+	qaic_mhi_free_controller(qdev->mhi_cntl, link_up);
+	pci_free_irq_vectors(pdev);
+	iounmap(qdev->bar_0);
+	pci_clear_master(pdev);
+	pci_release_selected_regions(pdev, qdev->bars);
+	pci_disable_device(pdev);
+	pci_set_drvdata(pdev, NULL);
+	kfree(qdev);
 }
 
 static const struct pci_device_id ids[] = {
@@ -44,12 +151,15 @@ static int __init qaic_init(void)
 
 	ret = pci_register_driver(&qaic_pci_driver);
 
+	pr_debug("qaic: init success\n");
+
 	return ret;
 }
 
 static void __exit qaic_exit(void)
 {
 	pr_debug("qaic: exit\n");
+	link_up = true;
 	pci_unregister_driver(&qaic_pci_driver);
 }
 
-- 
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Code Aurora Forum, a Linux Foundation Collaborative Project.