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Merge branch 'topic/sun' into for-linus

This commit is contained in:
Vinod Koul 2017-11-14 10:37:07 +05:30
parent 135ab7f53c 464aa6f54b
commit d2045ba3a4
2 changed files with 220 additions and 61 deletions
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26
Documentation/devicetree/bindings/dma/sun6i-dma.txt
View File

@ -27,6 +27,32 @@ Example:
#dma-cells = <1>;
};
------------------------------------------------------------------------------
For A64 DMA controller:
Required properties:
- compatible: "allwinner,sun50i-a64-dma"
- dma-channels: Number of DMA channels supported by the controller.
Refer to Documentation/devicetree/bindings/dma/dma.txt
- all properties above, i.e. reg, interrupts, clocks, resets and #dma-cells
Optional properties:
- dma-requests: Number of DMA request signals supported by the controller.
Refer to Documentation/devicetree/bindings/dma/dma.txt
Example:
dma: dma-controller@1c02000 {
compatible = "allwinner,sun50i-a64-dma";
reg = <0x01c02000 0x1000>;
interrupts = <GIC_SPI 50 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&ccu CLK_BUS_DMA>;
dma-channels = <8>;
dma-requests = <27>;
resets = <&ccu RST_BUS_DMA>;
#dma-cells = <1>;
};
------------------------------------------------------------------------------
Clients:
DMA clients connected to the A31 DMA controller must use the format

255
drivers/dma/sun6i-dma.c
View File

@ -42,12 +42,18 @@
#define DMA_STAT 0x30
/* Offset between DMA_IRQ_EN and DMA_IRQ_STAT limits number of channels */
#define DMA_MAX_CHANNELS (DMA_IRQ_CHAN_NR * 0x10 / 4)
/*
* sun8i specific registers
*/
#define SUN8I_DMA_GATE 0x20
#define SUN8I_DMA_GATE_ENABLE 0x4
#define SUNXI_H3_SECURE_REG 0x20
#define SUNXI_H3_DMA_GATE 0x28
#define SUNXI_H3_DMA_GATE_ENABLE 0x4
/*
* Channels specific registers
*/
@ -62,16 +68,19 @@
#define DMA_CHAN_LLI_ADDR 0x08
#define DMA_CHAN_CUR_CFG 0x0c
#define DMA_CHAN_CFG_SRC_DRQ(x) ((x) & 0x1f)
#define DMA_CHAN_MAX_DRQ 0x1f
#define DMA_CHAN_CFG_SRC_DRQ(x) ((x) & DMA_CHAN_MAX_DRQ)
#define DMA_CHAN_CFG_SRC_IO_MODE BIT(5)
#define DMA_CHAN_CFG_SRC_LINEAR_MODE (0 << 5)
#define DMA_CHAN_CFG_SRC_BURST(x) (((x) & 0x3) << 7)
#define DMA_CHAN_CFG_SRC_BURST_A31(x) (((x) & 0x3) << 7)
#define DMA_CHAN_CFG_SRC_BURST_H3(x) (((x) & 0x3) << 6)
#define DMA_CHAN_CFG_SRC_WIDTH(x) (((x) & 0x3) << 9)
#define DMA_CHAN_CFG_DST_DRQ(x) (DMA_CHAN_CFG_SRC_DRQ(x) << 16)
#define DMA_CHAN_CFG_DST_IO_MODE (DMA_CHAN_CFG_SRC_IO_MODE << 16)
#define DMA_CHAN_CFG_DST_LINEAR_MODE (DMA_CHAN_CFG_SRC_LINEAR_MODE << 16)
#define DMA_CHAN_CFG_DST_BURST(x) (DMA_CHAN_CFG_SRC_BURST(x) << 16)
#define DMA_CHAN_CFG_DST_BURST_A31(x) (DMA_CHAN_CFG_SRC_BURST_A31(x) << 16)
#define DMA_CHAN_CFG_DST_BURST_H3(x) (DMA_CHAN_CFG_SRC_BURST_H3(x) << 16)
#define DMA_CHAN_CFG_DST_WIDTH(x) (DMA_CHAN_CFG_SRC_WIDTH(x) << 16)
#define DMA_CHAN_CUR_SRC 0x10
@ -90,6 +99,9 @@
#define NORMAL_WAIT 8
#define DRQ_SDRAM 1
/* forward declaration */
struct sun6i_dma_dev;
/*
* Hardware channels / ports representation
*
@ -111,7 +123,12 @@ struct sun6i_dma_config {
* however these SoCs really have and need this bit, as seen in the
* BSP kernel source code.
*/
bool gate_needed;
void (*clock_autogate_enable)(struct sun6i_dma_dev *);
void (*set_burst_length)(u32 *p_cfg, s8 src_burst, s8 dst_burst);
u32 src_burst_lengths;
u32 dst_burst_lengths;
u32 src_addr_widths;
u32 dst_addr_widths;
};
/*
@ -175,6 +192,9 @@ struct sun6i_dma_dev {
struct sun6i_pchan *pchans;
struct sun6i_vchan *vchans;
const struct sun6i_dma_config *cfg;
u32 num_pchans;
u32 num_vchans;
u32 max_request;
};
static struct device *chan2dev(struct dma_chan *chan)
@ -251,8 +271,12 @@ static inline s8 convert_burst(u32 maxburst)
switch (maxburst) {
case 1:
return 0;
case 4:
return 1;
case 8:
return 2;
case 16:
return 3;
default:
return -EINVAL;
}
@ -260,11 +284,29 @@ static inline s8 convert_burst(u32 maxburst)
static inline s8 convert_buswidth(enum dma_slave_buswidth addr_width)
{
if ((addr_width < DMA_SLAVE_BUSWIDTH_1_BYTE) ||
(addr_width > DMA_SLAVE_BUSWIDTH_4_BYTES))
return -EINVAL;
return ilog2(addr_width);
}
return addr_width >> 1;
static void sun6i_enable_clock_autogate_a23(struct sun6i_dma_dev *sdev)
{
writel(SUN8I_DMA_GATE_ENABLE, sdev->base + SUN8I_DMA_GATE);
}
static void sun6i_enable_clock_autogate_h3(struct sun6i_dma_dev *sdev)
{
writel(SUNXI_H3_DMA_GATE_ENABLE, sdev->base + SUNXI_H3_DMA_GATE);
}
static void sun6i_set_burst_length_a31(u32 *p_cfg, s8 src_burst, s8 dst_burst)
{
*p_cfg |= DMA_CHAN_CFG_SRC_BURST_A31(src_burst) |
DMA_CHAN_CFG_DST_BURST_A31(dst_burst);
}
static void sun6i_set_burst_length_h3(u32 *p_cfg, s8 src_burst, s8 dst_burst)
{
*p_cfg |= DMA_CHAN_CFG_SRC_BURST_H3(src_burst) |
DMA_CHAN_CFG_DST_BURST_H3(dst_burst);
}
static size_t sun6i_get_chan_size(struct sun6i_pchan *pchan)
@ -399,7 +441,6 @@ static int sun6i_dma_start_desc(struct sun6i_vchan *vchan)
static void sun6i_dma_tasklet(unsigned long data)
{
struct sun6i_dma_dev *sdev = (struct sun6i_dma_dev *)data;
const struct sun6i_dma_config *cfg = sdev->cfg;
struct sun6i_vchan *vchan;
struct sun6i_pchan *pchan;
unsigned int pchan_alloc = 0;
@ -427,7 +468,7 @@ static void sun6i_dma_tasklet(unsigned long data)
}
spin_lock_irq(&sdev->lock);
for (pchan_idx = 0; pchan_idx < cfg->nr_max_channels; pchan_idx++) {
for (pchan_idx = 0; pchan_idx < sdev->num_pchans; pchan_idx++) {
pchan = &sdev->pchans[pchan_idx];
if (pchan->vchan || list_empty(&sdev->pending))
@ -448,7 +489,7 @@ static void sun6i_dma_tasklet(unsigned long data)
}
spin_unlock_irq(&sdev->lock);
for (pchan_idx = 0; pchan_idx < cfg->nr_max_channels; pchan_idx++) {
for (pchan_idx = 0; pchan_idx < sdev->num_pchans; pchan_idx++) {
if (!(pchan_alloc & BIT(pchan_idx)))
continue;
@ -470,7 +511,7 @@ static irqreturn_t sun6i_dma_interrupt(int irq, void *dev_id)
int i, j, ret = IRQ_NONE;
u32 status;
for (i = 0; i < sdev->cfg->nr_max_channels / DMA_IRQ_CHAN_NR; i++) {
for (i = 0; i < sdev->num_pchans / DMA_IRQ_CHAN_NR; i++) {
status = readl(sdev->base + DMA_IRQ_STAT(i));
if (!status)
continue;
@ -510,47 +551,49 @@ static int set_config(struct sun6i_dma_dev *sdev,
enum dma_transfer_direction direction,
u32 *p_cfg)
{
enum dma_slave_buswidth src_addr_width, dst_addr_width;
u32 src_maxburst, dst_maxburst;
s8 src_width, dst_width, src_burst, dst_burst;
src_addr_width = sconfig->src_addr_width;
dst_addr_width = sconfig->dst_addr_width;
src_maxburst = sconfig->src_maxburst;
dst_maxburst = sconfig->dst_maxburst;
switch (direction) {
case DMA_MEM_TO_DEV:
src_burst = convert_burst(sconfig->src_maxburst ?
sconfig->src_maxburst : 8);
src_width = convert_buswidth(sconfig->src_addr_width !=
DMA_SLAVE_BUSWIDTH_UNDEFINED ?
sconfig->src_addr_width :
DMA_SLAVE_BUSWIDTH_4_BYTES);
dst_burst = convert_burst(sconfig->dst_maxburst);
dst_width = convert_buswidth(sconfig->dst_addr_width);
if (src_addr_width == DMA_SLAVE_BUSWIDTH_UNDEFINED)
src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
src_maxburst = src_maxburst ? src_maxburst : 8;
break;
case DMA_DEV_TO_MEM:
src_burst = convert_burst(sconfig->src_maxburst);
src_width = convert_buswidth(sconfig->src_addr_width);
dst_burst = convert_burst(sconfig->dst_maxburst ?
sconfig->dst_maxburst : 8);
dst_width = convert_buswidth(sconfig->dst_addr_width !=
DMA_SLAVE_BUSWIDTH_UNDEFINED ?
sconfig->dst_addr_width :
DMA_SLAVE_BUSWIDTH_4_BYTES);
if (dst_addr_width == DMA_SLAVE_BUSWIDTH_UNDEFINED)
dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
dst_maxburst = dst_maxburst ? dst_maxburst : 8;
break;
default:
return -EINVAL;
}
if (src_burst < 0)
return src_burst;
if (src_width < 0)
return src_width;
if (dst_burst < 0)
return dst_burst;
if (dst_width < 0)
return dst_width;
if (!(BIT(src_addr_width) & sdev->slave.src_addr_widths))
return -EINVAL;
if (!(BIT(dst_addr_width) & sdev->slave.dst_addr_widths))
return -EINVAL;
if (!(BIT(src_maxburst) & sdev->cfg->src_burst_lengths))
return -EINVAL;
if (!(BIT(dst_maxburst) & sdev->cfg->dst_burst_lengths))
return -EINVAL;
*p_cfg = DMA_CHAN_CFG_SRC_BURST(src_burst) |
DMA_CHAN_CFG_SRC_WIDTH(src_width) |
DMA_CHAN_CFG_DST_BURST(dst_burst) |
src_width = convert_buswidth(src_addr_width);
dst_width = convert_buswidth(dst_addr_width);
dst_burst = convert_burst(dst_maxburst);
src_burst = convert_burst(src_maxburst);
*p_cfg = DMA_CHAN_CFG_SRC_WIDTH(src_width) |
DMA_CHAN_CFG_DST_WIDTH(dst_width);
sdev->cfg->set_burst_length(p_cfg, src_burst, dst_burst);
return 0;
}
@ -593,11 +636,11 @@ static struct dma_async_tx_descriptor *sun6i_dma_prep_dma_memcpy(
DMA_CHAN_CFG_DST_DRQ(DRQ_SDRAM) |
DMA_CHAN_CFG_DST_LINEAR_MODE |
DMA_CHAN_CFG_SRC_LINEAR_MODE |
DMA_CHAN_CFG_SRC_BURST(burst) |
DMA_CHAN_CFG_SRC_WIDTH(width) |
DMA_CHAN_CFG_DST_BURST(burst) |
DMA_CHAN_CFG_DST_WIDTH(width);
sdev->cfg->set_burst_length(&v_lli->cfg, burst, burst);
sun6i_dma_lli_add(NULL, v_lli, p_lli, txd);
sun6i_dma_dump_lli(vchan, v_lli);
@ -948,7 +991,7 @@ static struct dma_chan *sun6i_dma_of_xlate(struct of_phandle_args *dma_spec,
struct dma_chan *chan;
u8 port = dma_spec->args[0];
if (port > sdev->cfg->nr_max_requests)
if (port > sdev->max_request)
return NULL;
chan = dma_get_any_slave_channel(&sdev->slave);
@ -981,7 +1024,7 @@ static inline void sun6i_dma_free(struct sun6i_dma_dev *sdev)
{
int i;
for (i = 0; i < sdev->cfg->nr_max_vchans; i++) {
for (i = 0; i < sdev->num_vchans; i++) {
struct sun6i_vchan *vchan = &sdev->vchans[i];
list_del(&vchan->vc.chan.device_node);
@ -1009,6 +1052,15 @@ static struct sun6i_dma_config sun6i_a31_dma_cfg = {
.nr_max_channels = 16,
.nr_max_requests = 30,
.nr_max_vchans = 53,
.set_burst_length = sun6i_set_burst_length_a31,
.src_burst_lengths = BIT(1) | BIT(8),
.dst_burst_lengths = BIT(1) | BIT(8),
.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES),
.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES),
};
/*
@ -1020,24 +1072,76 @@ static struct sun6i_dma_config sun8i_a23_dma_cfg = {
.nr_max_channels = 8,
.nr_max_requests = 24,
.nr_max_vchans = 37,
.gate_needed = true,
.clock_autogate_enable = sun6i_enable_clock_autogate_a23,
.set_burst_length = sun6i_set_burst_length_a31,
.src_burst_lengths = BIT(1) | BIT(8),
.dst_burst_lengths = BIT(1) | BIT(8),
.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES),
.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES),
};
static struct sun6i_dma_config sun8i_a83t_dma_cfg = {
.nr_max_channels = 8,
.nr_max_requests = 28,
.nr_max_vchans = 39,
.clock_autogate_enable = sun6i_enable_clock_autogate_a23,
.set_burst_length = sun6i_set_burst_length_a31,
.src_burst_lengths = BIT(1) | BIT(8),
.dst_burst_lengths = BIT(1) | BIT(8),
.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES),
.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES),
};
/*
* The H3 has 12 physical channels, a maximum DRQ port id of 27,
* and a total of 34 usable source and destination endpoints.
* It also supports additional burst lengths and bus widths,
* and the burst length fields have different offsets.
*/
static struct sun6i_dma_config sun8i_h3_dma_cfg = {
.nr_max_channels = 12,
.nr_max_requests = 27,
.nr_max_vchans = 34,
.clock_autogate_enable = sun6i_enable_clock_autogate_h3,
.set_burst_length = sun6i_set_burst_length_h3,
.src_burst_lengths = BIT(1) | BIT(4) | BIT(8) | BIT(16),
.dst_burst_lengths = BIT(1) | BIT(4) | BIT(8) | BIT(16),
.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_8_BYTES),
.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_8_BYTES),
};
/*
* The A64 binding uses the number of dma channels from the
* device tree node.
*/
static struct sun6i_dma_config sun50i_a64_dma_cfg = {
.clock_autogate_enable = sun6i_enable_clock_autogate_h3,
.set_burst_length = sun6i_set_burst_length_h3,
.src_burst_lengths = BIT(1) | BIT(4) | BIT(8) | BIT(16),
.dst_burst_lengths = BIT(1) | BIT(4) | BIT(8) | BIT(16),
.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_8_BYTES),
.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_8_BYTES),
};
/*
@ -1049,7 +1153,16 @@ static struct sun6i_dma_config sun8i_v3s_dma_cfg = {
.nr_max_channels = 8,
.nr_max_requests = 23,
.nr_max_vchans = 24,
.gate_needed = true,
.clock_autogate_enable = sun6i_enable_clock_autogate_a23,
.set_burst_length = sun6i_set_burst_length_a31,
.src_burst_lengths = BIT(1) | BIT(8),
.dst_burst_lengths = BIT(1) | BIT(8),
.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES),
.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES),
};
static const struct of_device_id sun6i_dma_match[] = {
@ -1058,13 +1171,14 @@ static const struct of_device_id sun6i_dma_match[] = {
{ .compatible = "allwinner,sun8i-a83t-dma", .data = &sun8i_a83t_dma_cfg },
{ .compatible = "allwinner,sun8i-h3-dma", .data = &sun8i_h3_dma_cfg },
{ .compatible = "allwinner,sun8i-v3s-dma", .data = &sun8i_v3s_dma_cfg },
{ .compatible = "allwinner,sun50i-a64-dma", .data = &sun50i_a64_dma_cfg },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, sun6i_dma_match);
static int sun6i_dma_probe(struct platform_device *pdev)
{
const struct of_device_id *device;
struct device_node *np = pdev->dev.of_node;
struct sun6i_dma_dev *sdc;
struct resource *res;
int ret, i;
@ -1073,10 +1187,9 @@ static int sun6i_dma_probe(struct platform_device *pdev)
if (!sdc)
return -ENOMEM;
device = of_match_device(sun6i_dma_match, &pdev->dev);
if (!device)
sdc->cfg = of_device_get_match_data(&pdev->dev);
if (!sdc->cfg)
return -ENODEV;
sdc->cfg = device->data;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
sdc->base = devm_ioremap_resource(&pdev->dev, res);
@ -1129,37 +1242,57 @@ static int sun6i_dma_probe(struct platform_device *pdev)
sdc->slave.device_pause = sun6i_dma_pause;
sdc->slave.device_resume = sun6i_dma_resume;
sdc->slave.device_terminate_all = sun6i_dma_terminate_all;
sdc->slave.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
sdc->slave.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
sdc->slave.src_addr_widths = sdc->cfg->src_addr_widths;
sdc->slave.dst_addr_widths = sdc->cfg->dst_addr_widths;
sdc->slave.directions = BIT(DMA_DEV_TO_MEM) |
BIT(DMA_MEM_TO_DEV);
sdc->slave.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
sdc->slave.dev = &pdev->dev;
sdc->pchans = devm_kcalloc(&pdev->dev, sdc->cfg->nr_max_channels,
sdc->num_pchans = sdc->cfg->nr_max_channels;
sdc->num_vchans = sdc->cfg->nr_max_vchans;
sdc->max_request = sdc->cfg->nr_max_requests;
ret = of_property_read_u32(np, "dma-channels", &sdc->num_pchans);
if (ret && !sdc->num_pchans) {
dev_err(&pdev->dev, "Can't get dma-channels.\n");
return ret;
}
ret = of_property_read_u32(np, "dma-requests", &sdc->max_request);
if (ret && !sdc->max_request) {
dev_info(&pdev->dev, "Missing dma-requests, using %u.\n",
DMA_CHAN_MAX_DRQ);
sdc->max_request = DMA_CHAN_MAX_DRQ;
}
/*
* If the number of vchans is not specified, derive it from the
* highest port number, at most one channel per port and direction.
*/
if (!sdc->num_vchans)
sdc->num_vchans = 2 * (sdc->max_request + 1);
sdc->pchans = devm_kcalloc(&pdev->dev, sdc->num_pchans,
sizeof(struct sun6i_pchan), GFP_KERNEL);
if (!sdc->pchans)
return -ENOMEM;
sdc->vchans = devm_kcalloc(&pdev->dev, sdc->cfg->nr_max_vchans,
sdc->vchans = devm_kcalloc(&pdev->dev, sdc->num_vchans,
sizeof(struct sun6i_vchan), GFP_KERNEL);
if (!sdc->vchans)
return -ENOMEM;
tasklet_init(&sdc->task, sun6i_dma_tasklet, (unsigned long)sdc);
for (i = 0; i < sdc->cfg->nr_max_channels; i++) {
for (i = 0; i < sdc->num_pchans; i++) {
struct sun6i_pchan *pchan = &sdc->pchans[i];
pchan->idx = i;
pchan->base = sdc->base + 0x100 + i * 0x40;
}
for (i = 0; i < sdc->cfg->nr_max_vchans; i++) {
for (i = 0; i < sdc->num_vchans; i++) {
struct sun6i_vchan *vchan = &sdc->vchans[i];
INIT_LIST_HEAD(&vchan->node);
@ -1199,8 +1332,8 @@ static int sun6i_dma_probe(struct platform_device *pdev)
goto err_dma_unregister;
}
if (sdc->cfg->gate_needed)
writel(SUN8I_DMA_GATE_ENABLE, sdc->base + SUN8I_DMA_GATE);
if (sdc->cfg->clock_autogate_enable)
sdc->cfg->clock_autogate_enable(sdc);
return 0;