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Subject[PATCH v2 3/3] soc: qcom: geni: Add support for gpi dma
Date
GPI DMA is one of the DMA modes supported on geni, this adds support to
enable that mode

Signed-off-by: Vinod Koul <vkoul@kernel.org>
---
drivers/soc/qcom/qcom-geni-se.c | 32 +++++++++++++++++++++++++++++++-
include/linux/qcom-geni-se.h | 5 +++--
2 files changed, 34 insertions(+), 3 deletions(-)

diff --git a/drivers/soc/qcom/qcom-geni-se.c b/drivers/soc/qcom/qcom-geni-se.c
index 08d645b90ed3..40a0a1f88070 100644
--- a/drivers/soc/qcom/qcom-geni-se.c
+++ b/drivers/soc/qcom/qcom-geni-se.c
@@ -307,6 +307,32 @@ static void geni_se_select_dma_mode(struct geni_se *se)
writel_relaxed(val, se->base + SE_GENI_DMA_MODE_EN);
}

+static void geni_se_select_gpi_mode(struct geni_se *se)
+{
+ unsigned int gpi_event_en;
+ unsigned int m_irq_en;
+ unsigned int s_irq_en;
+
+ geni_se_irq_clear(se);
+ writel(0, se->base + SE_IRQ_EN);
+
+ s_irq_en = readl_relaxed(se->base + SE_GENI_S_IRQ_EN);
+ s_irq_en &= ~S_CMD_DONE_EN;
+ writel(s_irq_en, se->base + SE_GENI_S_IRQ_EN);
+
+ m_irq_en = readl(se->base + SE_GENI_M_IRQ_EN);
+ m_irq_en &= ~(M_CMD_DONE_EN | M_TX_FIFO_WATERMARK_EN |
+ M_RX_FIFO_WATERMARK_EN | M_RX_FIFO_LAST_EN);
+ writel(m_irq_en, se->base + SE_GENI_M_IRQ_EN);
+
+ writel(GENI_DMA_MODE_EN, se->base + SE_GENI_DMA_MODE_EN);
+
+ gpi_event_en = readl(se->base + SE_GSI_EVENT_EN);
+ gpi_event_en |= (DMA_RX_EVENT_EN | DMA_TX_EVENT_EN |
+ GENI_M_EVENT_EN | GENI_S_EVENT_EN);
+ writel(gpi_event_en, se->base + SE_GSI_EVENT_EN);
+}
+
/**
* geni_se_select_mode() - Select the serial engine transfer mode
* @se: Pointer to the concerned serial engine.
@@ -314,7 +340,8 @@ static void geni_se_select_dma_mode(struct geni_se *se)
*/
void geni_se_select_mode(struct geni_se *se, enum geni_se_xfer_mode mode)
{
- WARN_ON(mode != GENI_SE_FIFO && mode != GENI_SE_DMA);
+ WARN_ON(mode != GENI_SE_FIFO && mode != GENI_SE_DMA &&
+ mode != GENI_GPI_DMA);

switch (mode) {
case GENI_SE_FIFO:
@@ -323,6 +350,9 @@ void geni_se_select_mode(struct geni_se *se, enum geni_se_xfer_mode mode)
case GENI_SE_DMA:
geni_se_select_dma_mode(se);
break;
+ case GENI_GPI_DMA:
+ geni_se_select_gpi_mode(se);
+ break;
case GENI_SE_INVALID:
default:
break;
diff --git a/include/linux/qcom-geni-se.h b/include/linux/qcom-geni-se.h
index 5fda675c5cfe..336b682392b1 100644
--- a/include/linux/qcom-geni-se.h
+++ b/include/linux/qcom-geni-se.h
@@ -11,8 +11,9 @@
/* Transfer mode supported by GENI Serial Engines */
enum geni_se_xfer_mode {
GENI_SE_INVALID,
- GENI_SE_FIFO,
- GENI_SE_DMA,
+ GENI_SE_FIFO, /* FIFO mode */
+ GENI_GPI_DMA, /* GSI aka GPI DMA mode */
+ GENI_SE_DMA, /* SE DMA mode */
};

/* Protocols supported by GENI Serial Engines */
--
2.31.1
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