redonkable
/
alistair23-linux
1
0
Fork 0
Code Releases Activity

dmaengine: dma-jz4780: Add support for the JZ4725B SoC 

The JZ4725B has one DMA core starring six DMA channels.
As for the JZ4770, each DMA channel's clock can be enabled with
a register write, the difference here being that once started, it
is not possible to turn it off.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Tested-by: Mathieu Malaterre <malat@debian.org>
Reviewed-by: PrasannaKumar Muralidharan <prasannatsmkumar@gmail.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
hifive-unleashed-5.1
Paul Cercueil 2018-08-29 23:32:51 +02:00 committed by Vinod Koul
parent ffaaa8cc4e
commit ae9156b63d
1 changed files with 20 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
drivers/dma/dma-jz4780.c
View File

@ -94,6 +94,7 @@
#define JZ_SOC_DATA_ALLOW_LEGACY_DT BIT(0)
#define JZ_SOC_DATA_PROGRAMMABLE_DMA BIT(1)
#define JZ_SOC_DATA_PER_CHAN_PM BIT(2)
#define JZ_SOC_DATA_NO_DCKES_DCKEC BIT(3)
/**
* struct jz4780_dma_hwdesc - descriptor structure read by the DMA controller.
@ -208,14 +209,23 @@ static inline void jz4780_dma_ctrl_writel(struct jz4780_dma_dev *jzdma,
static inline void jz4780_dma_chan_enable(struct jz4780_dma_dev *jzdma,
unsigned int chn)
{
if (jzdma->soc_data->flags & JZ_SOC_DATA_PER_CHAN_PM)
jz4780_dma_ctrl_writel(jzdma, JZ_DMA_REG_DCKES, BIT(chn));
if (jzdma->soc_data->flags & JZ_SOC_DATA_PER_CHAN_PM) {
unsigned int reg;
if (jzdma->soc_data->flags & JZ_SOC_DATA_NO_DCKES_DCKEC)
reg = JZ_DMA_REG_DCKE;
else
reg = JZ_DMA_REG_DCKES;
jz4780_dma_ctrl_writel(jzdma, reg, BIT(chn));
}
}
static inline void jz4780_dma_chan_disable(struct jz4780_dma_dev *jzdma,
unsigned int chn)
{
if (jzdma->soc_data->flags & JZ_SOC_DATA_PER_CHAN_PM)
if ((jzdma->soc_data->flags & JZ_SOC_DATA_PER_CHAN_PM) &&
!(jzdma->soc_data->flags & JZ_SOC_DATA_NO_DCKES_DCKEC))
jz4780_dma_ctrl_writel(jzdma, JZ_DMA_REG_DCKEC, BIT(chn));
}
@ -978,6 +988,12 @@ static const struct jz4780_dma_soc_data jz4740_dma_soc_data = {
.transfer_ord_max = 5,
};
static const struct jz4780_dma_soc_data jz4725b_dma_soc_data = {
.nb_channels = 6,
.transfer_ord_max = 5,
.flags = JZ_SOC_DATA_PER_CHAN_PM | JZ_SOC_DATA_NO_DCKES_DCKEC,
};
static const struct jz4780_dma_soc_data jz4770_dma_soc_data = {
.nb_channels = 6,
.transfer_ord_max = 6,
@ -992,6 +1008,7 @@ static const struct jz4780_dma_soc_data jz4780_dma_soc_data = {
static const struct of_device_id jz4780_dma_dt_match[] = {
{ .compatible = "ingenic,jz4740-dma", .data = &jz4740_dma_soc_data },
{ .compatible = "ingenic,jz4725b-dma", .data = &jz4725b_dma_soc_data },
{ .compatible = "ingenic,jz4770-dma", .data = &jz4770_dma_soc_data },
{ .compatible = "ingenic,jz4780-dma", .data = &jz4780_dma_soc_data },
{},