linux-kernel - [PATCH v2 3/3] soc: qcom: geni: Add support for gpi dma

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Date:   Fri, 18 Jun 2021 19:48:39 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     linux-arm-msm@...r.kernel.org, Vinod Koul <vkoul@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        Douglas Anderson <dianders@...omium.org>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 3/3] soc: qcom: geni: Add support for gpi dma

GPI DMA is one of the DMA modes supported on geni, this adds support to
enable that mode

Signed-off-by: Vinod Koul <vkoul@...nel.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