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Subject[PATCH v1 2/8] dmaengine: stm32-dma: threshold manages with bitfield feature
Date
From now on, DMA bitfield is to manage DMA FIFO Threshold.

Signed-off-by: Pierre-Yves MORDRET <pierre-yves.mordret@st.com>
---
Version history:
v1:
* Initial
---
---
drivers/dma/stm32-dma.c | 19 ++++++++++++++++---
1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/drivers/dma/stm32-dma.c b/drivers/dma/stm32-dma.c
index 786fc8f..4099948 100644
--- a/drivers/dma/stm32-dma.c
+++ b/drivers/dma/stm32-dma.c
@@ -116,6 +116,10 @@
#define STM32_DMA_MAX_DATA_PARAM 0x03
#define STM32_DMA_MAX_BURST 16

+/* DMA Features */
+#define STM32_DMA_THRESHOLD_FTR_MASK GENMASK(1, 0)
+#define STM32_DMA_THRESHOLD_FTR_GET(n) ((n) & STM32_DMA_THRESHOLD_FTR_MASK)
+
enum stm32_dma_width {
STM32_DMA_BYTE,
STM32_DMA_HALF_WORD,
@@ -129,11 +133,18 @@ enum stm32_dma_burst_size {
STM32_DMA_BURST_INCR16,
};

+/**
+ * struct stm32_dma_cfg - STM32 DMA custom configuration
+ * @channel_id: channel ID
+ * @request_line: DMA request
+ * @stream_config: 32bit mask specifying the DMA channel configuration
+ * @features: 32bit mask specifying the DMA Feature list
+ */
struct stm32_dma_cfg {
u32 channel_id;
u32 request_line;
u32 stream_config;
- u32 threshold;
+ u32 features;
};

struct stm32_dma_chan_reg {
@@ -171,6 +182,7 @@ struct stm32_dma_chan {
u32 next_sg;
struct dma_slave_config dma_sconfig;
struct stm32_dma_chan_reg chan_reg;
+ u32 threshold;
};

struct stm32_dma_device {
@@ -976,7 +988,8 @@ static void stm32_dma_set_config(struct stm32_dma_chan *chan,
/* Enable Interrupts */
chan->chan_reg.dma_scr |= STM32_DMA_SCR_TEIE | STM32_DMA_SCR_TCIE;

- chan->chan_reg.dma_sfcr = cfg->threshold & STM32_DMA_SFCR_FTH_MASK;
+ chan->threshold = STM32_DMA_THRESHOLD_FTR_GET(cfg->features);
+ chan->chan_reg.dma_sfcr = STM32_DMA_SFCR_FTH(chan->threshold);
}

static struct dma_chan *stm32_dma_of_xlate(struct of_phandle_args *dma_spec,
@@ -996,7 +1009,7 @@ static struct dma_chan *stm32_dma_of_xlate(struct of_phandle_args *dma_spec,
cfg.channel_id = dma_spec->args[0];
cfg.request_line = dma_spec->args[1];
cfg.stream_config = dma_spec->args[2];
- cfg.threshold = dma_spec->args[3];
+ cfg.features = dma_spec->args[3];

if ((cfg.channel_id >= STM32_DMA_MAX_CHANNELS) ||
(cfg.request_line >= STM32_DMA_MAX_REQUEST_ID)) {
--
2.7.4
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