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

Vinod Koul
2021-01-11T15:18:32Z

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 | 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