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authorKuninori Morimoto <kuninori.morimoto.gx@renesas.com>2011-06-17 08:20:40 +0000
committerPaul Mundt <lethal@linux-sh.org>2011-06-21 17:55:57 +0900
commit5899a723b336da241b492583d7e55f1055f8f3b3 (patch)
tree3d75b8d88a99e277779325790903a76913a3e2d9 /drivers/dma
parent090b91805a97f58a7deff0f2b40aad1cc2f1b7e0 (diff)
downloadop-kernel-dev-5899a723b336da241b492583d7e55f1055f8f3b3.zip
op-kernel-dev-5899a723b336da241b492583d7e55f1055f8f3b3.tar.gz
dmaengine: shdma: add chcr_write/read function
CHCR register position is not same in all DMAC. This patch adds new "chcr_offset" to decide it. Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'drivers/dma')
-rw-r--r--drivers/dma/shdma.c35
-rw-r--r--drivers/dma/shdma.h1
2 files changed, 28 insertions, 8 deletions
diff --git a/drivers/dma/shdma.c b/drivers/dma/shdma.c
index 41a21b3..40900c1 100644
--- a/drivers/dma/shdma.c
+++ b/drivers/dma/shdma.c
@@ -78,6 +78,20 @@ static void dmaor_write(struct sh_dmae_device *shdev, u16 data)
__raw_writew(data, shdev->chan_reg + DMAOR / sizeof(u32));
}
+static void chcr_write(struct sh_dmae_chan *sh_dc, u32 data)
+{
+ struct sh_dmae_device *shdev = to_sh_dev(sh_dc);
+
+ __raw_writel(data, sh_dc->base + shdev->chcr_offset / sizeof(u32));
+}
+
+static u32 chcr_read(struct sh_dmae_chan *sh_dc)
+{
+ struct sh_dmae_device *shdev = to_sh_dev(sh_dc);
+
+ return __raw_readl(sh_dc->base + shdev->chcr_offset / sizeof(u32));
+}
+
/*
* Reset DMA controller
*
@@ -120,7 +134,7 @@ static int sh_dmae_rst(struct sh_dmae_device *shdev)
static bool dmae_is_busy(struct sh_dmae_chan *sh_chan)
{
- u32 chcr = sh_dmae_readl(sh_chan, CHCR);
+ u32 chcr = chcr_read(sh_chan);
if ((chcr & (CHCR_DE | CHCR_TE)) == CHCR_DE)
return true; /* working */
@@ -167,18 +181,18 @@ static void dmae_set_reg(struct sh_dmae_chan *sh_chan, struct sh_dmae_regs *hw)
static void dmae_start(struct sh_dmae_chan *sh_chan)
{
- u32 chcr = sh_dmae_readl(sh_chan, CHCR);
+ u32 chcr = chcr_read(sh_chan);
chcr |= CHCR_DE | CHCR_IE;
- sh_dmae_writel(sh_chan, chcr & ~CHCR_TE, CHCR);
+ chcr_write(sh_chan, chcr & ~CHCR_TE);
}
static void dmae_halt(struct sh_dmae_chan *sh_chan)
{
- u32 chcr = sh_dmae_readl(sh_chan, CHCR);
+ u32 chcr = chcr_read(sh_chan);
chcr &= ~(CHCR_DE | CHCR_TE | CHCR_IE);
- sh_dmae_writel(sh_chan, chcr, CHCR);
+ chcr_write(sh_chan, chcr);
}
static void dmae_init(struct sh_dmae_chan *sh_chan)
@@ -190,7 +204,7 @@ static void dmae_init(struct sh_dmae_chan *sh_chan)
u32 chcr = DM_INC | SM_INC | 0x400 | log2size_to_chcr(sh_chan,
LOG2_DEFAULT_XFER_SIZE);
sh_chan->xmit_shift = calc_xmit_shift(sh_chan, chcr);
- sh_dmae_writel(sh_chan, chcr, CHCR);
+ chcr_write(sh_chan, chcr);
}
static int dmae_set_chcr(struct sh_dmae_chan *sh_chan, u32 val)
@@ -200,7 +214,7 @@ static int dmae_set_chcr(struct sh_dmae_chan *sh_chan, u32 val)
return -EBUSY;
sh_chan->xmit_shift = calc_xmit_shift(sh_chan, val);
- sh_dmae_writel(sh_chan, val, CHCR);
+ chcr_write(sh_chan, val);
return 0;
}
@@ -840,7 +854,7 @@ static irqreturn_t sh_dmae_interrupt(int irq, void *data)
spin_lock(&sh_chan->desc_lock);
- chcr = sh_dmae_readl(sh_chan, CHCR);
+ chcr = chcr_read(sh_chan);
if (chcr & CHCR_TE) {
/* DMA stop */
@@ -1138,6 +1152,11 @@ static int __init sh_dmae_probe(struct platform_device *pdev)
/* platform data */
shdev->pdata = pdata;
+ if (pdata->chcr_offset)
+ shdev->chcr_offset = pdata->chcr_offset;
+ else
+ shdev->chcr_offset = CHCR;
+
platform_set_drvdata(pdev, shdev);
pm_runtime_enable(&pdev->dev);
diff --git a/drivers/dma/shdma.h b/drivers/dma/shdma.h
index 6c73b65..6f064ca 100644
--- a/drivers/dma/shdma.h
+++ b/drivers/dma/shdma.h
@@ -47,6 +47,7 @@ struct sh_dmae_device {
struct list_head node;
u32 __iomem *chan_reg;
u16 __iomem *dmars;
+ unsigned int chcr_offset;
};
#define to_sh_chan(chan) container_of(chan, struct sh_dmae_chan, common)
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