linux-kernel - [PATCH 3/7] soc: qcom: geni: Add support for gpi dma

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Message-Id: <20210111151651.1616813-4-vkoul@kernel.org>
Date:   Mon, 11 Jan 2021 20:46:47 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Mark Brown <broonie@...nel.org>, Wolfram Sang <wsa@...nel.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>,
        Amit Pundir <amit.pundir@...aro.org>,
        linux-spi@...r.kernel.org, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 3/7] 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 | 39 ++++++++++++++++++++++++++++++++-
 include/linux/qcom-geni-se.h    |  4 ++++
 2 files changed, 42 insertions(+), 1 deletion(-)

diff --git a/drivers/soc/qcom/qcom-geni-se.c b/drivers/soc/qcom/qcom-geni-se.c
index a3868228ea05..db44dc32e049 100644
--- a/drivers/soc/qcom/qcom-geni-se.c
+++ b/drivers/soc/qcom/qcom-geni-se.c
@@ -310,6 +310,39 @@ static void geni_se_select_dma_mode(struct geni_se *se)
 		writel_relaxed(val, se->base + SE_GENI_DMA_MODE_EN);
 }
 
+static int geni_se_select_gpi_mode(struct geni_se *se)
+{
+	unsigned int geni_dma_mode = 0;
+	unsigned int gpi_event_en = 0;
+	unsigned int common_geni_m_irq_en = 0;
+	unsigned int common_geni_s_irq_en = 0;
+
+	common_geni_m_irq_en = readl_relaxed(se->base + SE_GENI_M_IRQ_EN);
+	common_geni_s_irq_en = readl_relaxed(se->base + SE_GENI_S_IRQ_EN);
+	common_geni_m_irq_en &=
+			~(M_CMD_DONE_EN | M_TX_FIFO_WATERMARK_EN |
+			M_RX_FIFO_WATERMARK_EN | M_RX_FIFO_LAST_EN);
+	common_geni_s_irq_en &= ~S_CMD_DONE_EN;
+	geni_dma_mode = readl_relaxed(se->base + SE_GENI_DMA_MODE_EN);
+	gpi_event_en = readl_relaxed(se->base + SE_GSI_EVENT_EN);
+
+	geni_dma_mode |= GENI_DMA_MODE_EN;
+	gpi_event_en |= (DMA_RX_EVENT_EN | DMA_TX_EVENT_EN |
+				GENI_M_EVENT_EN | GENI_S_EVENT_EN);
+
+	writel_relaxed(0, se->base + SE_IRQ_EN);
+	writel_relaxed(common_geni_s_irq_en, se->base + SE_GENI_S_IRQ_EN);
+	writel_relaxed(common_geni_m_irq_en, se->base + SE_GENI_M_IRQ_EN);
+	writel_relaxed(0xFFFFFFFF, se->base + SE_GENI_M_IRQ_CLEAR);
+	writel_relaxed(0xFFFFFFFF, se->base + SE_GENI_S_IRQ_CLEAR);
+	writel_relaxed(0xFFFFFFFF, se->base + SE_DMA_TX_IRQ_CLR);
+	writel_relaxed(0xFFFFFFFF, se->base + SE_DMA_RX_IRQ_CLR);
+	writel_relaxed(geni_dma_mode, se->base + SE_GENI_DMA_MODE_EN);
+	writel_relaxed(gpi_event_en, se->base + SE_GSI_EVENT_EN);
+
+	return 0;
+}
+
 /**
  * geni_se_select_mode() - Select the serial engine transfer mode
  * @se:		Pointer to the concerned serial engine.
@@ -317,7 +350,8 @@ 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:
@@ -326,6 +360,9 @@ 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 cb4e40908f9f..12003a6cb133 100644
--- a/include/linux/qcom-geni-se.h
+++ b/include/linux/qcom-geni-se.h
@@ -12,6 +12,7 @@
 enum geni_se_xfer_mode {
 	GENI_SE_INVALID,
 	GENI_SE_FIFO,
+	GENI_GPI_DMA,
 	GENI_SE_DMA,
 };
 
@@ -123,6 +124,9 @@ struct geni_se {
 #define CLK_DIV_MSK			GENMASK(15, 4)
 #define CLK_DIV_SHFT			4
 
+/* GENI_IF_DISABLE_RO fields */
+#define FIFO_IF_DISABLE			(BIT(0))
+
 /* GENI_FW_REVISION_RO fields */
 #define FW_REV_PROTOCOL_MSK		GENMASK(15, 8)
 #define FW_REV_PROTOCOL_SHFT		8
-- 
2.26.2