Merge branch 'topic/mv_xor' into for-linus
diff --git a/drivers/dma/mv_xor_v2.c b/drivers/dma/mv_xor_v2.c
index a28a01f..f652a0e 100644
--- a/drivers/dma/mv_xor_v2.c
+++ b/drivers/dma/mv_xor_v2.c
@@ -42,6 +42,7 @@
#define MV_XOR_V2_DMA_IMSG_THRD_OFF 0x018
#define MV_XOR_V2_DMA_IMSG_THRD_MASK 0x7FFF
#define MV_XOR_V2_DMA_IMSG_THRD_SHIFT 0x0
+#define MV_XOR_V2_DMA_IMSG_TIMER_EN BIT(18)
#define MV_XOR_V2_DMA_DESQ_AWATTR_OFF 0x01C
/* Same flags as MV_XOR_V2_DMA_DESQ_ARATTR_OFF */
#define MV_XOR_V2_DMA_DESQ_ALLOC_OFF 0x04C
@@ -55,6 +56,9 @@
#define MV_XOR_V2_DMA_DESQ_STOP_OFF 0x800
#define MV_XOR_V2_DMA_DESQ_DEALLOC_OFF 0x804
#define MV_XOR_V2_DMA_DESQ_ADD_OFF 0x808
+#define MV_XOR_V2_DMA_IMSG_TMOT 0x810
+#define MV_XOR_V2_DMA_IMSG_TIMER_THRD_MASK 0x1FFF
+#define MV_XOR_V2_DMA_IMSG_TIMER_THRD_SHIFT 0
/* XOR Global registers */
#define MV_XOR_V2_GLOB_BW_CTRL 0x4
@@ -90,6 +94,13 @@
*/
#define MV_XOR_V2_DESC_NUM 1024
+/*
+ * Threshold values for descriptors and timeout, determined by
+ * experimentation as giving a good level of performance.
+ */
+#define MV_XOR_V2_DONE_IMSG_THRD 0x14
+#define MV_XOR_V2_TIMER_THRD 0xB0
+
/**
* struct mv_xor_v2_descriptor - DMA HW descriptor
* @desc_id: used by S/W and is not affected by H/W.
@@ -161,6 +172,7 @@ struct mv_xor_v2_device {
struct mv_xor_v2_sw_desc *sw_desq;
int desc_size;
unsigned int npendings;
+ unsigned int hw_queue_idx;
};
/**
@@ -214,18 +226,6 @@ static void mv_xor_v2_set_data_buffers(struct mv_xor_v2_device *xor_dev,
}
/*
- * Return the next available index in the DESQ.
- */
-static int mv_xor_v2_get_desq_write_ptr(struct mv_xor_v2_device *xor_dev)
-{
- /* read the index for the next available descriptor in the DESQ */
- u32 reg = readl(xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_ALLOC_OFF);
-
- return ((reg >> MV_XOR_V2_DMA_DESQ_ALLOC_WRPTR_SHIFT)
- & MV_XOR_V2_DMA_DESQ_ALLOC_WRPTR_MASK);
-}
-
-/*
* notify the engine of new descriptors, and update the available index.
*/
static void mv_xor_v2_add_desc_to_desq(struct mv_xor_v2_device *xor_dev,
@@ -261,16 +261,23 @@ static int mv_xor_v2_set_desc_size(struct mv_xor_v2_device *xor_dev)
* Set the IMSG threshold
*/
static inline
-void mv_xor_v2_set_imsg_thrd(struct mv_xor_v2_device *xor_dev, int thrd_val)
+void mv_xor_v2_enable_imsg_thrd(struct mv_xor_v2_device *xor_dev)
{
u32 reg;
+ /* Configure threshold of number of descriptors, and enable timer */
reg = readl(xor_dev->dma_base + MV_XOR_V2_DMA_IMSG_THRD_OFF);
-
reg &= (~MV_XOR_V2_DMA_IMSG_THRD_MASK << MV_XOR_V2_DMA_IMSG_THRD_SHIFT);
- reg |= (thrd_val << MV_XOR_V2_DMA_IMSG_THRD_SHIFT);
-
+ reg |= (MV_XOR_V2_DONE_IMSG_THRD << MV_XOR_V2_DMA_IMSG_THRD_SHIFT);
+ reg |= MV_XOR_V2_DMA_IMSG_TIMER_EN;
writel(reg, xor_dev->dma_base + MV_XOR_V2_DMA_IMSG_THRD_OFF);
+
+ /* Configure Timer Threshold */
+ reg = readl(xor_dev->dma_base + MV_XOR_V2_DMA_IMSG_TMOT);
+ reg &= (~MV_XOR_V2_DMA_IMSG_TIMER_THRD_MASK <<
+ MV_XOR_V2_DMA_IMSG_TIMER_THRD_SHIFT);
+ reg |= (MV_XOR_V2_TIMER_THRD << MV_XOR_V2_DMA_IMSG_TIMER_THRD_SHIFT);
+ writel(reg, xor_dev->dma_base + MV_XOR_V2_DMA_IMSG_TMOT);
}
static irqreturn_t mv_xor_v2_interrupt_handler(int irq, void *data)
@@ -288,12 +295,6 @@ static irqreturn_t mv_xor_v2_interrupt_handler(int irq, void *data)
if (!ndescs)
return IRQ_NONE;
- /*
- * Update IMSG threshold, to disable new IMSG interrupts until
- * end of the tasklet
- */
- mv_xor_v2_set_imsg_thrd(xor_dev, MV_XOR_V2_DESC_NUM);
-
/* schedule a tasklet to handle descriptors callbacks */
tasklet_schedule(&xor_dev->irq_tasklet);
@@ -306,7 +307,6 @@ static irqreturn_t mv_xor_v2_interrupt_handler(int irq, void *data)
static dma_cookie_t
mv_xor_v2_tx_submit(struct dma_async_tx_descriptor *tx)
{
- int desq_ptr;
void *dest_hw_desc;
dma_cookie_t cookie;
struct mv_xor_v2_sw_desc *sw_desc =
@@ -322,15 +322,15 @@ mv_xor_v2_tx_submit(struct dma_async_tx_descriptor *tx)
spin_lock_bh(&xor_dev->lock);
cookie = dma_cookie_assign(tx);
- /* get the next available slot in the DESQ */
- desq_ptr = mv_xor_v2_get_desq_write_ptr(xor_dev);
-
/* copy the HW descriptor from the SW descriptor to the DESQ */
- dest_hw_desc = xor_dev->hw_desq_virt + desq_ptr;
+ dest_hw_desc = xor_dev->hw_desq_virt + xor_dev->hw_queue_idx;
memcpy(dest_hw_desc, &sw_desc->hw_desc, xor_dev->desc_size);
xor_dev->npendings++;
+ xor_dev->hw_queue_idx++;
+ if (xor_dev->hw_queue_idx >= MV_XOR_V2_DESC_NUM)
+ xor_dev->hw_queue_idx = 0;
spin_unlock_bh(&xor_dev->lock);
@@ -344,6 +344,7 @@ static struct mv_xor_v2_sw_desc *
mv_xor_v2_prep_sw_desc(struct mv_xor_v2_device *xor_dev)
{
struct mv_xor_v2_sw_desc *sw_desc;
+ bool found = false;
/* Lock the channel */
spin_lock_bh(&xor_dev->lock);
@@ -355,19 +356,23 @@ mv_xor_v2_prep_sw_desc(struct mv_xor_v2_device *xor_dev)
return NULL;
}
- /* get a free SW descriptor from the SW DESQ */
- sw_desc = list_first_entry(&xor_dev->free_sw_desc,
- struct mv_xor_v2_sw_desc, free_list);
+ list_for_each_entry(sw_desc, &xor_dev->free_sw_desc, free_list) {
+ if (async_tx_test_ack(&sw_desc->async_tx)) {
+ found = true;
+ break;
+ }
+ }
+
+ if (!found) {
+ spin_unlock_bh(&xor_dev->lock);
+ return NULL;
+ }
+
list_del(&sw_desc->free_list);
/* Release the channel */
spin_unlock_bh(&xor_dev->lock);
- /* set the async tx descriptor */
- dma_async_tx_descriptor_init(&sw_desc->async_tx, &xor_dev->dmachan);
- sw_desc->async_tx.tx_submit = mv_xor_v2_tx_submit;
- async_tx_ack(&sw_desc->async_tx);
-
return sw_desc;
}
@@ -389,6 +394,8 @@ mv_xor_v2_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest,
__func__, len, &src, &dest, flags);
sw_desc = mv_xor_v2_prep_sw_desc(xor_dev);
+ if (!sw_desc)
+ return NULL;
sw_desc->async_tx.flags = flags;
@@ -443,6 +450,8 @@ mv_xor_v2_prep_dma_xor(struct dma_chan *chan, dma_addr_t dest, dma_addr_t *src,
__func__, src_cnt, len, &dest, flags);
sw_desc = mv_xor_v2_prep_sw_desc(xor_dev);
+ if (!sw_desc)
+ return NULL;
sw_desc->async_tx.flags = flags;
@@ -491,6 +500,8 @@ mv_xor_v2_prep_dma_interrupt(struct dma_chan *chan, unsigned long flags)
container_of(chan, struct mv_xor_v2_device, dmachan);
sw_desc = mv_xor_v2_prep_sw_desc(xor_dev);
+ if (!sw_desc)
+ return NULL;
/* set the HW descriptor */
hw_descriptor = &sw_desc->hw_desc;
@@ -524,9 +535,6 @@ static void mv_xor_v2_issue_pending(struct dma_chan *chan)
mv_xor_v2_add_desc_to_desq(xor_dev, xor_dev->npendings);
xor_dev->npendings = 0;
- /* Activate the channel */
- writel(0, xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_STOP_OFF);
-
spin_unlock_bh(&xor_dev->lock);
}
@@ -554,7 +562,6 @@ static void mv_xor_v2_tasklet(unsigned long data)
{
struct mv_xor_v2_device *xor_dev = (struct mv_xor_v2_device *) data;
int pending_ptr, num_of_pending, i;
- struct mv_xor_v2_descriptor *next_pending_hw_desc = NULL;
struct mv_xor_v2_sw_desc *next_pending_sw_desc = NULL;
dev_dbg(xor_dev->dmadev.dev, "%s %d\n", __func__, __LINE__);
@@ -562,17 +569,10 @@ static void mv_xor_v2_tasklet(unsigned long data)
/* get the pending descriptors parameters */
num_of_pending = mv_xor_v2_get_pending_params(xor_dev, &pending_ptr);
- /* next HW descriptor */
- next_pending_hw_desc = xor_dev->hw_desq_virt + pending_ptr;
-
/* loop over free descriptors */
for (i = 0; i < num_of_pending; i++) {
-
- if (pending_ptr > MV_XOR_V2_DESC_NUM)
- pending_ptr = 0;
-
- if (next_pending_sw_desc != NULL)
- next_pending_hw_desc++;
+ struct mv_xor_v2_descriptor *next_pending_hw_desc =
+ xor_dev->hw_desq_virt + pending_ptr;
/* get the SW descriptor related to the HW descriptor */
next_pending_sw_desc =
@@ -608,15 +608,14 @@ static void mv_xor_v2_tasklet(unsigned long data)
/* increment the next descriptor */
pending_ptr++;
+ if (pending_ptr >= MV_XOR_V2_DESC_NUM)
+ pending_ptr = 0;
}
if (num_of_pending != 0) {
/* free the descriptores */
mv_xor_v2_free_desc_from_desq(xor_dev, num_of_pending);
}
-
- /* Update IMSG threshold, to enable new IMSG interrupts */
- mv_xor_v2_set_imsg_thrd(xor_dev, 0);
}
/*
@@ -648,9 +647,6 @@ static int mv_xor_v2_descq_init(struct mv_xor_v2_device *xor_dev)
writel((xor_dev->hw_desq & 0xFFFF00000000) >> 32,
xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_BAHR_OFF);
- /* enable the DMA engine */
- writel(0, xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_STOP_OFF);
-
/*
* This is a temporary solution, until we activate the
* SMMU. Set the attributes for reading & writing data buffers
@@ -694,6 +690,30 @@ static int mv_xor_v2_descq_init(struct mv_xor_v2_device *xor_dev)
reg |= MV_XOR_V2_GLOB_PAUSE_AXI_TIME_DIS_VAL;
writel(reg, xor_dev->glob_base + MV_XOR_V2_GLOB_PAUSE);
+ /* enable the DMA engine */
+ writel(0, xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_STOP_OFF);
+
+ return 0;
+}
+
+static int mv_xor_v2_suspend(struct platform_device *dev, pm_message_t state)
+{
+ struct mv_xor_v2_device *xor_dev = platform_get_drvdata(dev);
+
+ /* Set this bit to disable to stop the XOR unit. */
+ writel(0x1, xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_STOP_OFF);
+
+ return 0;
+}
+
+static int mv_xor_v2_resume(struct platform_device *dev)
+{
+ struct mv_xor_v2_device *xor_dev = platform_get_drvdata(dev);
+
+ mv_xor_v2_set_desc_size(xor_dev);
+ mv_xor_v2_enable_imsg_thrd(xor_dev);
+ mv_xor_v2_descq_init(xor_dev);
+
return 0;
}
@@ -725,6 +745,10 @@ static int mv_xor_v2_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, xor_dev);
+ ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(40));
+ if (ret)
+ return ret;
+
xor_dev->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(xor_dev->clk) && PTR_ERR(xor_dev->clk) == -EPROBE_DEFER)
return -EPROBE_DEFER;
@@ -785,8 +809,15 @@ static int mv_xor_v2_probe(struct platform_device *pdev)
/* add all SW descriptors to the free list */
for (i = 0; i < MV_XOR_V2_DESC_NUM; i++) {
- xor_dev->sw_desq[i].idx = i;
- list_add(&xor_dev->sw_desq[i].free_list,
+ struct mv_xor_v2_sw_desc *sw_desc =
+ xor_dev->sw_desq + i;
+ sw_desc->idx = i;
+ dma_async_tx_descriptor_init(&sw_desc->async_tx,
+ &xor_dev->dmachan);
+ sw_desc->async_tx.tx_submit = mv_xor_v2_tx_submit;
+ async_tx_ack(&sw_desc->async_tx);
+
+ list_add(&sw_desc->free_list,
&xor_dev->free_sw_desc);
}
@@ -816,6 +847,8 @@ static int mv_xor_v2_probe(struct platform_device *pdev)
list_add_tail(&xor_dev->dmachan.device_node,
&dma_dev->channels);
+ mv_xor_v2_enable_imsg_thrd(xor_dev);
+
mv_xor_v2_descq_init(xor_dev);
ret = dma_async_device_register(dma_dev);
@@ -865,6 +898,8 @@ MODULE_DEVICE_TABLE(of, mv_xor_v2_dt_ids);
static struct platform_driver mv_xor_v2_driver = {
.probe = mv_xor_v2_probe,
+ .suspend = mv_xor_v2_suspend,
+ .resume = mv_xor_v2_resume,
.remove = mv_xor_v2_remove,
.driver = {
.name = "mv_xor_v2",