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authorStephan Gerhold <stephan@gerhold.net>2021-10-18 12:24:21 +0200
committerVinod Koul <vkoul@kernel.org>2021-10-28 22:42:30 +0530
commit9502ffcda0491c2079e2f6e3278b3c7377fd81fb (patch)
treec9e64f88f585211ad3867ed4477591e52a47cabf
parent37aef53f5ccf789a87006e0dcbce187ce3427f63 (diff)
downloadlinux-9502ffcda0491c2079e2f6e3278b3c7377fd81fb.tar.bz2
dmaengine: qcom: bam_dma: Add "powered remotely" mode
In some configurations, the BAM DMA controller is set up by a remote processor and the local processor can simply start making use of it without setting up the BAM. This is already supported using the "qcom,controlled-remotely" property. However, for some reason another possible configuration is that the remote processor is responsible for powering up the BAM, but we are still responsible for initializing it (e.g. resetting it etc). This configuration is quite challenging to handle properly because the power control is handled through separate channels (e.g. device-specific SMSM interrupts / smem-states). Great care must be taken to ensure the BAM registers are not accessed while the BAM is powered off since this results in a bus stall. Attempt to support this configuration with minimal device-specific code in the bam_dma driver by tracking the number of requested channels. Consumers of DMA channels are responsible to only request DMA channels when the BAM was powered on by the remote processor, and to release them before the BAM is powered off. When the first channel is requested the BAM is initialized (reset) and it is also put into reset when the last channel was released. Signed-off-by: Stephan Gerhold <stephan@gerhold.net> Reviewed-by: Bhupesh Sharma <bhupesh.sharma@linaro.org> Link: https://lore.kernel.org/r/20211018102421.19848-3-stephan@gerhold.net Signed-off-by: Vinod Koul <vkoul@kernel.org>
-rw-r--r--drivers/dma/qcom/bam_dma.c90
1 files changed, 57 insertions, 33 deletions
diff --git a/drivers/dma/qcom/bam_dma.c b/drivers/dma/qcom/bam_dma.c
index c8a77b428b52..87f6ca1541cf 100644
--- a/drivers/dma/qcom/bam_dma.c
+++ b/drivers/dma/qcom/bam_dma.c
@@ -388,6 +388,8 @@ struct bam_device {
/* execution environment ID, from DT */
u32 ee;
bool controlled_remotely;
+ bool powered_remotely;
+ u32 active_channels;
const struct reg_offset_data *layout;
@@ -416,6 +418,44 @@ static inline void __iomem *bam_addr(struct bam_device *bdev, u32 pipe,
}
/**
+ * bam_reset() - reset and initialize BAM registers
+ * @bdev: bam device
+ */
+static void bam_reset(struct bam_device *bdev)
+{
+ u32 val;
+
+ /* s/w reset bam */
+ /* after reset all pipes are disabled and idle */
+ val = readl_relaxed(bam_addr(bdev, 0, BAM_CTRL));
+ val |= BAM_SW_RST;
+ writel_relaxed(val, bam_addr(bdev, 0, BAM_CTRL));
+ val &= ~BAM_SW_RST;
+ writel_relaxed(val, bam_addr(bdev, 0, BAM_CTRL));
+
+ /* make sure previous stores are visible before enabling BAM */
+ wmb();
+
+ /* enable bam */
+ val |= BAM_EN;
+ writel_relaxed(val, bam_addr(bdev, 0, BAM_CTRL));
+
+ /* set descriptor threshhold, start with 4 bytes */
+ writel_relaxed(DEFAULT_CNT_THRSHLD,
+ bam_addr(bdev, 0, BAM_DESC_CNT_TRSHLD));
+
+ /* Enable default set of h/w workarounds, ie all except BAM_FULL_PIPE */
+ writel_relaxed(BAM_CNFG_BITS_DEFAULT, bam_addr(bdev, 0, BAM_CNFG_BITS));
+
+ /* enable irqs for errors */
+ writel_relaxed(BAM_ERROR_EN | BAM_HRESP_ERR_EN,
+ bam_addr(bdev, 0, BAM_IRQ_EN));
+
+ /* unmask global bam interrupt */
+ writel_relaxed(BAM_IRQ_MSK, bam_addr(bdev, 0, BAM_IRQ_SRCS_MSK_EE));
+}
+
+/**
* bam_reset_channel - Reset individual BAM DMA channel
* @bchan: bam channel
*
@@ -512,6 +552,9 @@ static int bam_alloc_chan(struct dma_chan *chan)
return -ENOMEM;
}
+ if (bdev->active_channels++ == 0 && bdev->powered_remotely)
+ bam_reset(bdev);
+
return 0;
}
@@ -565,6 +608,13 @@ static void bam_free_chan(struct dma_chan *chan)
/* disable irq */
writel_relaxed(0, bam_addr(bdev, bchan->id, BAM_P_IRQ_EN));
+ if (--bdev->active_channels == 0 && bdev->powered_remotely) {
+ /* s/w reset bam */
+ val = readl_relaxed(bam_addr(bdev, 0, BAM_CTRL));
+ val |= BAM_SW_RST;
+ writel_relaxed(val, bam_addr(bdev, 0, BAM_CTRL));
+ }
+
err:
pm_runtime_mark_last_busy(bdev->dev);
pm_runtime_put_autosuspend(bdev->dev);
@@ -1164,37 +1214,9 @@ static int bam_init(struct bam_device *bdev)
bdev->num_channels = val & BAM_NUM_PIPES_MASK;
}
- if (bdev->controlled_remotely)
- return 0;
-
- /* s/w reset bam */
- /* after reset all pipes are disabled and idle */
- val = readl_relaxed(bam_addr(bdev, 0, BAM_CTRL));
- val |= BAM_SW_RST;
- writel_relaxed(val, bam_addr(bdev, 0, BAM_CTRL));
- val &= ~BAM_SW_RST;
- writel_relaxed(val, bam_addr(bdev, 0, BAM_CTRL));
-
- /* make sure previous stores are visible before enabling BAM */
- wmb();
-
- /* enable bam */
- val |= BAM_EN;
- writel_relaxed(val, bam_addr(bdev, 0, BAM_CTRL));
-
- /* set descriptor threshhold, start with 4 bytes */
- writel_relaxed(DEFAULT_CNT_THRSHLD,
- bam_addr(bdev, 0, BAM_DESC_CNT_TRSHLD));
-
- /* Enable default set of h/w workarounds, ie all except BAM_FULL_PIPE */
- writel_relaxed(BAM_CNFG_BITS_DEFAULT, bam_addr(bdev, 0, BAM_CNFG_BITS));
-
- /* enable irqs for errors */
- writel_relaxed(BAM_ERROR_EN | BAM_HRESP_ERR_EN,
- bam_addr(bdev, 0, BAM_IRQ_EN));
-
- /* unmask global bam interrupt */
- writel_relaxed(BAM_IRQ_MSK, bam_addr(bdev, 0, BAM_IRQ_SRCS_MSK_EE));
+ /* Reset BAM now if fully controlled locally */
+ if (!bdev->controlled_remotely && !bdev->powered_remotely)
+ bam_reset(bdev);
return 0;
}
@@ -1257,8 +1279,10 @@ static int bam_dma_probe(struct platform_device *pdev)
bdev->controlled_remotely = of_property_read_bool(pdev->dev.of_node,
"qcom,controlled-remotely");
+ bdev->powered_remotely = of_property_read_bool(pdev->dev.of_node,
+ "qcom,powered-remotely");
- if (bdev->controlled_remotely) {
+ if (bdev->controlled_remotely || bdev->powered_remotely) {
ret = of_property_read_u32(pdev->dev.of_node, "num-channels",
&bdev->num_channels);
if (ret)
@@ -1270,7 +1294,7 @@ static int bam_dma_probe(struct platform_device *pdev)
dev_err(bdev->dev, "num-ees unspecified in dt\n");
}
- if (bdev->controlled_remotely)
+ if (bdev->controlled_remotely || bdev->powered_remotely)
bdev->bamclk = devm_clk_get_optional(bdev->dev, "bam_clk");
else
bdev->bamclk = devm_clk_get(bdev->dev, "bam_clk");