@@ -53,11 +53,20 @@ struct bam_desc_hw {
#define BAM_DMA_AUTOSUSPEND_DELAY 100
+#define SW_VERSION_MAJOR_SHIFT 28
+#define SW_VERSION_MINOR_SHIFT 16
+#define SW_VERSION_MAJOR_MASK (0xf << SW_VERSION_MAJOR_SHIFT)
+#define SW_VERSION_MINOR_MASK 0xf
+#define SW_MAJOR_1 0x1
+#define SW_VERSION_4 0x4
+
#define DESC_FLAG_INT BIT(15)
#define DESC_FLAG_EOT BIT(14)
#define DESC_FLAG_EOB BIT(13)
#define DESC_FLAG_NWD BIT(12)
#define DESC_FLAG_CMD BIT(11)
+#define DESC_FLAG_LOCK BIT(10)
+#define DESC_FLAG_UNLOCK BIT(9)
struct bam_async_desc {
struct virt_dma_desc vd;
@@ -393,6 +402,7 @@ struct bam_device {
u32 ee;
bool controlled_remotely;
bool powered_remotely;
+ bool bam_pipe_lock;
u32 active_channels;
u32 bam_sw_version;
@@ -696,9 +706,15 @@ static struct dma_async_tx_descriptor *bam_prep_slave_sg(struct dma_chan *chan,
unsigned int curr_offset = 0;
do {
- if (flags & DMA_PREP_CMD)
+ if (flags & DMA_PREP_CMD) {
desc->flags |= cpu_to_le16(DESC_FLAG_CMD);
+ if (bdev->bam_pipe_lock && flags & DMA_PREP_LOCK)
+ desc->flags |= cpu_to_le16(DESC_FLAG_LOCK);
+ else if (bdev->bam_pipe_lock && flags & DMA_PREP_UNLOCK)
+ desc->flags |= cpu_to_le16(DESC_FLAG_UNLOCK);
+ }
+
desc->addr = cpu_to_le32(sg_dma_address(sg) +
curr_offset);
@@ -1242,6 +1258,7 @@ static int bam_dma_probe(struct platform_device *pdev)
{
struct bam_device *bdev;
const struct of_device_id *match;
+ u32 sw_major, sw_minor;
int ret, i;
bdev = devm_kzalloc(&pdev->dev, sizeof(*bdev), GFP_KERNEL);
@@ -1305,6 +1322,12 @@ static int bam_dma_probe(struct platform_device *pdev)
bdev->bam_sw_version = readl_relaxed(bam_addr(bdev, 0, BAM_SW_VERSION));
dev_info(bdev->dev, "BAM software version:0x%08x\n", bdev->bam_sw_version);
+ sw_major = (bdev->bam_sw_version & SW_VERSION_MAJOR_MASK) >> SW_VERSION_MAJOR_SHIFT;
+ sw_minor = (bdev->bam_sw_version >> SW_VERSION_MINOR_SHIFT) & SW_VERSION_MINOR_MASK;
+
+ if (sw_major == SW_MAJOR_1 && sw_minor >= SW_VERSION_4)
+ bdev->bam_pipe_lock = true;
+
ret = bam_init(bdev);
if (ret)
@@ -200,6 +200,10 @@ struct dma_vec {
* transaction is marked with DMA_PREP_REPEAT will cause the new transaction
* to never be processed and stay in the issued queue forever. The flag is
* ignored if the previous transaction is not a repeated transaction.
+ * @DMA_PREP_LOCK: tell the driver that there is a lock bit set on command
+ * descriptor.
+ * @DMA_PREP_UNLOCK: tell the driver that there is a un-lock bit set on command
+ * descriptor.
*/
enum dma_ctrl_flags {
DMA_PREP_INTERRUPT = (1 << 0),
@@ -212,6 +216,8 @@ enum dma_ctrl_flags {
DMA_PREP_CMD = (1 << 7),
DMA_PREP_REPEAT = (1 << 8),
DMA_PREP_LOAD_EOT = (1 << 9),
+ DMA_PREP_LOCK = (1 << 10),
+ DMA_PREP_UNLOCK = (1 << 11),
};
/**
Add lock and unlock flag support on command descriptor. Once lock set in requester pipe, then the bam controller will lock all others pipe and process the request only from requester pipe. Unlocking only can be performed from the same pipe. If DMA_PREP_LOCK flag passed in command descriptor then requester of this transaction wanted to lock the BAM controller for this transaction so BAM driver should set LOCK bit for the HW descriptor. If DMA_PREP_UNLOCK flag passed in command descriptor then requester of this transaction wanted to unlock the BAM controller.so BAM driver should set UNLOCK bit for the HW descriptor. BAM IP version 1.4.0 and above only supports this LOCK/UNLOCK feature. So adding check for the same and setting bam_pipe_lock based on BAM SW Version. Signed-off-by: Md Sadre Alam <quic_mdalam@quicinc.com> --- Change in [v4] * Added BAM_SW_VERSION read for major & minor version * Added bam_pipe_lock flag Change in [v3] * Moved lock/unlock bit set inside loop Change in [v2] * No change Change in [v1] * Added initial support for BAM pipe lock/unlock drivers/dma/qcom/bam_dma.c | 25 ++++++++++++++++++++++++- include/linux/dmaengine.h | 6 ++++++ 2 files changed, 30 insertions(+), 1 deletion(-)