summaryrefslogtreecommitdiff
path: root/drivers/misc/mic/host/mic_device.h
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/misc/mic/host/mic_device.h')
-rw-r--r--drivers/misc/mic/host/mic_device.h24
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/misc/mic/host/mic_device.h b/drivers/misc/mic/host/mic_device.h
index 0398c696d257..016bd15a7bd1 100644
--- a/drivers/misc/mic/host/mic_device.h
+++ b/drivers/misc/mic/host/mic_device.h
@@ -25,6 +25,8 @@
#include <linux/idr.h>
#include <linux/notifier.h>
#include <linux/irqreturn.h>
+#include <linux/dmaengine.h>
+#include <linux/mic_bus.h>
#include "mic_intr.h"
@@ -87,6 +89,8 @@ enum mic_stepping {
* @cdev: Character device for MIC.
* @vdev_list: list of virtio devices.
* @pm_notifier: Handles PM notifications from the OS.
+ * @dma_mbdev: MIC BUS DMA device.
+ * @dma_ch: DMA channel reserved by this driver for use by virtio devices.
*/
struct mic_device {
struct mic_mw mmio;
@@ -124,6 +128,8 @@ struct mic_device {
struct cdev cdev;
struct list_head vdev_list;
struct notifier_block pm_notifier;
+ struct mbus_device *dma_mbdev;
+ struct dma_chan *dma_ch;
};
/**
@@ -144,6 +150,7 @@ struct mic_device {
* @load_mic_fw: Load firmware segments required to boot the card
* into card memory. This includes the kernel, command line, ramdisk etc.
* @get_postcode: Get post code status from firmware.
+ * @dma_filter: DMA filter function to be used.
*/
struct mic_hw_ops {
u8 aper_bar;
@@ -159,6 +166,7 @@ struct mic_hw_ops {
void (*send_firmware_intr)(struct mic_device *mdev);
int (*load_mic_fw)(struct mic_device *mdev, const char *buf);
u32 (*get_postcode)(struct mic_device *mdev);
+ bool (*dma_filter)(struct dma_chan *chan, void *param);
};
/**
@@ -187,6 +195,22 @@ mic_mmio_write(struct mic_mw *mw, u32 val, u32 offset)
iowrite32(val, mw->va + offset);
}
+static inline struct dma_chan *mic_request_dma_chan(struct mic_device *mdev)
+{
+ dma_cap_mask_t mask;
+ struct dma_chan *chan;
+
+ dma_cap_zero(mask);
+ dma_cap_set(DMA_MEMCPY, mask);
+ chan = dma_request_channel(mask, mdev->ops->dma_filter,
+ mdev->sdev->parent);
+ if (chan)
+ return chan;
+ dev_err(mdev->sdev->parent, "%s %d unable to acquire channel\n",
+ __func__, __LINE__);
+ return NULL;
+}
+
void mic_sysfs_init(struct mic_device *mdev);
int mic_start(struct mic_device *mdev, const char *buf);
void mic_stop(struct mic_device *mdev, bool force);