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Date: Tue, 27 May 2014 19:36:16 -0700
From: Sudeep Dutt <sudeep.dutt@...el.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Dan Williams <dan.j.williams@...el.com>
Cc: Siva Yerramreddy <yshivakrishna@...il.com>,
Ashutosh Dixit <ashutosh.dixit@...el.com>,
Nikhil Rao <nikhil.rao@...el.com>,
Sudeep Dutt <sudeep.dutt@...el.com>,
linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org
Subject: [PATCH char-misc-next 7/8] misc: mic: add dma support in card driver
From: Siva Yerramreddy <yshivakrishna@...il.com>
This patch adds a dma device on the mic virtual bus
Reviewed-by: Nikhil Rao <nikhil.rao@...el.com>
Signed-off-by: Sudeep Dutt <sudeep.dutt@...el.com>
Signed-off-by: Siva Yerramreddy <yshivakrishna@...il.com>
Signed-off-by: Ashutosh Dixit <ashutosh.dixit@...el.com>
---
drivers/misc/mic/Kconfig | 2 +-
drivers/misc/mic/card/mic_device.h | 3 +++
drivers/misc/mic/card/mic_x100.c | 52 +++++++++++++++++++++++++++++++++++++-
3 files changed, 55 insertions(+), 2 deletions(-)
diff --git a/drivers/misc/mic/Kconfig b/drivers/misc/mic/Kconfig
index bf76313..cc4eef0 100644
--- a/drivers/misc/mic/Kconfig
+++ b/drivers/misc/mic/Kconfig
@@ -39,7 +39,7 @@ comment "Intel MIC Card Driver"
config INTEL_MIC_CARD
tristate "Intel MIC Card Driver"
- depends on 64BIT && X86
+ depends on 64BIT && X86 && INTEL_MIC_BUS
select VIRTIO
help
This enables card driver support for the Intel Many Integrated
diff --git a/drivers/misc/mic/card/mic_device.h b/drivers/misc/mic/card/mic_device.h
index e12a0c2..8d735ba 100644
--- a/drivers/misc/mic/card/mic_device.h
+++ b/drivers/misc/mic/card/mic_device.h
@@ -31,6 +31,7 @@
#include <linux/io.h>
#include <linux/irqreturn.h>
#include <linux/interrupt.h>
+#include <linux/mic_bus.h>
/**
* struct mic_intr_info - Contains h/w specific interrupt sources info
@@ -71,6 +72,7 @@ struct mic_device {
* @hotplug_work: Hot plug work for adding/removing virtio devices.
* @irq_info: The OS specific irq information
* @intr_info: H/W specific interrupt information.
+ * @dma_mbdev: dma device on the MIC virtual bus.
*/
struct mic_driver {
char name[20];
@@ -81,6 +83,7 @@ struct mic_driver {
struct work_struct hotplug_work;
struct mic_irq_info irq_info;
struct mic_intr_info intr_info;
+ struct mbus_device dma_mbdev;
};
/**
diff --git a/drivers/misc/mic/card/mic_x100.c b/drivers/misc/mic/card/mic_x100.c
index 2868945..85066cf 100644
--- a/drivers/misc/mic/card/mic_x100.c
+++ b/drivers/misc/mic/card/mic_x100.c
@@ -148,6 +148,46 @@ void mic_card_unmap(struct mic_device *mdev, void __iomem *addr)
iounmap(addr);
}
+static inline struct mic_driver *mbdev_to_mdrv(struct mbus_device *mbdev)
+{
+ return dev_get_drvdata(mbdev->dev.parent);
+}
+
+static struct mic_irq *_mic_request_threaded_irq(struct mbus_device *mbdev,
+ irq_handler_t handler, irq_handler_t thread_fn,
+ const char *name, void *data, int intr_src)
+{
+ int rc = 0;
+ unsigned int irq = intr_src;
+ unsigned long cookie = irq;
+
+ rc = request_threaded_irq(irq, handler, thread_fn, 0, name, data);
+ if (rc) {
+ dev_err(mbdev_to_mdrv(mbdev)->dev,
+ "request_threaded_irq failed rc = %d\n", rc);
+ return ERR_PTR(rc);
+ }
+ return (struct mic_irq *)cookie;
+}
+
+static void _mic_free_irq(struct mbus_device *mbdev,
+ struct mic_irq *cookie, void *data)
+{
+ unsigned long irq = (unsigned long)cookie;
+ free_irq(irq, data);
+}
+
+static void _mic_ack_interrupt(struct mbus_device *mbdev, int num)
+{
+ mic_ack_interrupt(&mbdev_to_mdrv(mbdev)->mdev);
+}
+
+static struct mbus_hw_ops mbus_hw_ops = {
+ .request_threaded_irq = _mic_request_threaded_irq,
+ .free_irq = _mic_free_irq,
+ .ack_interrupt = _mic_ack_interrupt,
+};
+
static int __init mic_probe(struct platform_device *pdev)
{
struct mic_driver *mdrv = &g_drv;
@@ -166,13 +206,22 @@ static int __init mic_probe(struct platform_device *pdev)
goto done;
}
mic_hw_intr_init(mdrv);
+ platform_set_drvdata(pdev, mdrv);
+ rc = mbus_add_device(&mdrv->dma_mbdev, mdrv->dev, MBUS_DEV_DMA_MIC,
+ NULL, &mbus_hw_ops, mdrv->mdev.mmio.va);
+ if (rc) {
+ dev_err(&pdev->dev, "mbus_add_device failed rc %d\n", rc);
+ goto iounmap;
+ }
rc = mic_driver_init(mdrv);
if (rc) {
dev_err(&pdev->dev, "mic_driver_init failed rc %d\n", rc);
- goto iounmap;
+ goto remove_dma;
}
done:
return rc;
+remove_dma:
+ mbus_remove_device(&mdrv->dma_mbdev);
iounmap:
iounmap(mdev->mmio.va);
return rc;
@@ -184,6 +233,7 @@ static int mic_remove(struct platform_device *pdev)
struct mic_device *mdev = &mdrv->mdev;
mic_driver_uninit(mdrv);
+ mbus_remove_device(&mdrv->dma_mbdev);
iounmap(mdev->mmio.va);
return 0;
}
--
1.8.2.1
--
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