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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

Also do better documentation of the enum geni_se_xfer_mode.

Signed-off-by: Vinod Koul <vkoul@kernel.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20210625052213.32260-3-vkoul@kernel.org
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
This commit is contained in:
Vinod Koul 2021-06-25 10:52:10 +05:30 committed by Bjorn Andersson
parent cb531cab62
commit 0fa8266294
2 changed files with 42 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
drivers/soc/qcom/qcom-geni-se.c
View File

@ -321,6 +321,30 @@ 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)
{
u32 val;
geni_se_irq_clear(se);
writel(0, se->base + SE_IRQ_EN);
val = readl(se->base + SE_GENI_S_IRQ_EN);
val &= ~S_CMD_DONE_EN;
writel(val, se->base + SE_GENI_S_IRQ_EN);
val = readl(se->base + SE_GENI_M_IRQ_EN);
val &= ~(M_CMD_DONE_EN | M_TX_FIFO_WATERMARK_EN |
M_RX_FIFO_WATERMARK_EN | M_RX_FIFO_LAST_EN);
writel(val, se->base + SE_GENI_M_IRQ_EN);
writel(GENI_DMA_MODE_EN, se->base + SE_GENI_DMA_MODE_EN);
val = readl(se->base + SE_GSI_EVENT_EN);
val |= (DMA_RX_EVENT_EN | DMA_TX_EVENT_EN | GENI_M_EVENT_EN | GENI_S_EVENT_EN);
writel(val, se->base + SE_GSI_EVENT_EN);
}
/**
* geni_se_select_mode() - Select the serial engine transfer mode
* @se: Pointer to the concerned serial engine.
@ -328,7 +352,7 @@ 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:
@ -337,6 +361,9 @@ 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;

15
include/linux/qcom-geni-se.h
View File

@ -8,11 +8,24 @@
#include <linux/interconnect.h>
/* Transfer mode supported by GENI Serial Engines */
/**
* enum geni_se_xfer_mode: Transfer modes supported by Serial Engines
*
* @GENI_SE_INVALID: Invalid mode
* @GENI_SE_FIFO: FIFO mode. Data is transferred with SE FIFO
* by programmed IO method
* @GENI_SE_DMA: Serial Engine DMA mode. Data is transferred
* with SE by DMAengine internal to SE
* @GENI_GPI_DMA: GPI DMA mode. Data is transferred using a DMAengine
* configured by a firmware residing on a GSI engine. This DMA name is
* interchangeably used as GSI or GPI which seem to imply the same DMAengine
*/
enum geni_se_xfer_mode {
GENI_SE_INVALID,
GENI_SE_FIFO,
GENI_SE_DMA,
GENI_GPI_DMA,
};
/* Protocols supported by GENI Serial Engines */