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authorSiva Yerramreddy <yshivakrishna@gmail.com>2014-07-12 01:04:25 +0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-07-12 05:31:12 +0400
commita93a5244ed7bd3c5f7b51ccb08a14655820e38c3 (patch)
tree406592c575c8d4e767df755cd8820d2485a494dc /drivers/misc
parent9c3d37c7a1efcb1815ec5cb22f70ca98da24f6b1 (diff)
downloadlinux-a93a5244ed7bd3c5f7b51ccb08a14655820e38c3.tar.xz
misc: mic: add dma support in card driver
This patch adds a dma device on the mic virtual bus Reviewed-by: Nikhil Rao <nikhil.rao@intel.com> Signed-off-by: Sudeep Dutt <sudeep.dutt@intel.com> Signed-off-by: Siva Yerramreddy <yshivakrishna@gmail.com> Signed-off-by: Ashutosh Dixit <ashutosh.dixit@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc')
-rw-r--r--drivers/misc/mic/Kconfig2
-rw-r--r--drivers/misc/mic/card/mic_device.h8
-rw-r--r--drivers/misc/mic/card/mic_x100.c55
3 files changed, 61 insertions, 4 deletions
diff --git a/drivers/misc/mic/Kconfig b/drivers/misc/mic/Kconfig
index bf76313dab16..cc4eef040c14 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 e12a0c2ddb3d..844be8fc9b22 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;
};
/**
@@ -117,8 +120,9 @@ mic_mmio_write(struct mic_mw *mw, u32 val, u32 offset)
int mic_driver_init(struct mic_driver *mdrv);
void mic_driver_uninit(struct mic_driver *mdrv);
int mic_next_card_db(void);
-struct mic_irq *mic_request_card_irq(irq_handler_t handler,
- irq_handler_t thread_fn, const char *name, void *data, int intr_src);
+struct mic_irq *
+mic_request_card_irq(irq_handler_t handler, irq_handler_t thread_fn,
+ const char *name, void *data, int intr_src);
void mic_free_card_irq(struct mic_irq *cookie, void *data);
u32 mic_read_spad(struct mic_device *mdev, unsigned int idx);
void mic_send_intr(struct mic_device *mdev, int doorbell);
diff --git a/drivers/misc/mic/card/mic_x100.c b/drivers/misc/mic/card/mic_x100.c
index 2868945c9a4d..55c9465bd260 100644
--- a/drivers/misc/mic/card/mic_x100.c
+++ b/drivers/misc/mic/card/mic_x100.c
@@ -148,6 +148,47 @@ 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 +207,24 @@ static int __init mic_probe(struct platform_device *pdev)
goto done;
}
mic_hw_intr_init(mdrv);
+ platform_set_drvdata(pdev, mdrv);
+ mdrv->dma_mbdev = mbus_register_device(mdrv->dev, MBUS_DEV_DMA_MIC,
+ NULL, &mbus_hw_ops,
+ mdrv->mdev.mmio.va);
+ if (IS_ERR(mdrv->dma_mbdev)) {
+ rc = PTR_ERR(mdrv->dma_mbdev);
+ 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_unregister_device(mdrv->dma_mbdev);
iounmap:
iounmap(mdev->mmio.va);
return rc;
@@ -184,6 +236,7 @@ static int mic_remove(struct platform_device *pdev)
struct mic_device *mdev = &mdrv->mdev;
mic_driver_uninit(mdrv);
+ mbus_unregister_device(mdrv->dma_mbdev);
iounmap(mdev->mmio.va);
return 0;
}