openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

ARM: riscpc: dma: use __iomem pointers for writing DMA 

Use __iomem pointers for efficiency to write the DMA registers.
This avoids the compiler emitting several instructions for each access
to calculate the register address.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
This commit is contained in:
Russell King 2019-05-02 17:56:49 +01:00
parent e659587c64
commit 090a37ceda
1 changed files with 17 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
arch/arm/mach-rpc/dma.c
View File

@ -27,9 +27,9 @@
struct iomd_dma {
struct dma_struct dma;
unsigned int state;
unsigned long base; /* Controller base address */
void __iomem *base; /* Controller base address */
int irq; /* Controller IRQ */
unsigned int state;
dma_addr_t cur_addr;
unsigned int cur_len;
dma_addr_t dma_addr;
@ -98,12 +98,12 @@ static void iomd_get_next_sg(struct iomd_dma *idma)
static irqreturn_t iomd_dma_handle(int irq, void *dev_id)
{
struct iomd_dma *idma = dev_id;
unsigned long base = idma->base;
void __iomem *base = idma->base;
unsigned int state = idma->state;
unsigned int status, cur, end;
do {
status = iomd_readb(base + ST);
status = readb(base + ST);
if (!(status & DMA_ST_INT))
goto out;
@ -119,8 +119,8 @@ static irqreturn_t iomd_dma_handle(int irq, void *dev_id)
cur = CURB;
end = ENDB;
}
iomd_writel(idma->cur_addr, base + cur);
iomd_writel(idma->cur_len, base + end);
writel(idma->cur_addr, base + cur);
writel(idma->cur_len, base + end);
if (status & DMA_ST_OFL &&
idma->cur_len == (DMA_END_S|DMA_END_L))
@ -152,7 +152,7 @@ static void iomd_free_dma(unsigned int chan, dma_t *dma)
static void iomd_enable_dma(unsigned int chan, dma_t *dma)
{
struct iomd_dma *idma = container_of(dma, struct iomd_dma, dma);
unsigned long dma_base = idma->base;
void __iomem *base = idma->base;
unsigned int ctrl = TRANSFER_SIZE | DMA_CR_E;
if (idma->dma.invalid) {
@ -175,27 +175,27 @@ static void iomd_enable_dma(unsigned int chan, dma_t *dma)
idma->dma_addr = idma->dma.sg->dma_address;
idma->dma_len = idma->dma.sg->length;
iomd_writeb(DMA_CR_C, dma_base + CR);
writeb(DMA_CR_C, base + CR);
idma->state = DMA_ST_AB;
}
if (idma->dma.dma_mode == DMA_MODE_READ)
ctrl |= DMA_CR_D;
iomd_writeb(ctrl, dma_base + CR);
writeb(ctrl, base + CR);
enable_irq(idma->irq);
}
static void iomd_disable_dma(unsigned int chan, dma_t *dma)
{
struct iomd_dma *idma = container_of(dma, struct iomd_dma, dma);
unsigned long dma_base = idma->base;
void __iomem *base = idma->base;
unsigned long flags;
local_irq_save(flags);
if (idma->state != ~DMA_ST_AB)
disable_irq(idma->irq);
iomd_writeb(0, dma_base + CR);
writeb(0, base + CR);
local_irq_restore(flags);
}
@ -358,17 +358,17 @@ static int __init rpc_dma_init(void)
*/
iomd_writeb(DMA_EXT_IO3|DMA_EXT_IO2, IOMD_DMAEXT);
iomd_dma[DMA_0].base = IOMD_IO0CURA;
iomd_dma[DMA_0].base = IOMD_BASE + IOMD_IO0CURA;
iomd_dma[DMA_0].irq = IRQ_DMA0;
iomd_dma[DMA_1].base = IOMD_IO1CURA;
iomd_dma[DMA_1].base = IOMD_BASE + IOMD_IO1CURA;
iomd_dma[DMA_1].irq = IRQ_DMA1;
iomd_dma[DMA_2].base = IOMD_IO2CURA;
iomd_dma[DMA_2].base = IOMD_BASE + IOMD_IO2CURA;
iomd_dma[DMA_2].irq = IRQ_DMA2;
iomd_dma[DMA_3].base = IOMD_IO3CURA;
iomd_dma[DMA_3].base = IOMD_BASE + IOMD_IO3CURA;
iomd_dma[DMA_3].irq = IRQ_DMA3;
iomd_dma[DMA_S0].base = IOMD_SD0CURA;
iomd_dma[DMA_S0].base = IOMD_BASE + IOMD_SD0CURA;
iomd_dma[DMA_S0].irq = IRQ_DMAS0;
iomd_dma[DMA_S1].base = IOMD_SD1CURA;
iomd_dma[DMA_S1].base = IOMD_BASE + IOMD_SD1CURA;
iomd_dma[DMA_S1].irq = IRQ_DMAS1;
for (i = DMA_0; i <= DMA_S1; i++) {