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Message-ID: <1326424201-20056-3-git-send-email-richard.zhao@linaro.org>
Date: Fri, 13 Jan 2012 11:09:57 +0800
From: Richard Zhao <richard.zhao@...aro.org>
To: <linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>
CC: <dan.j.williams@...el.com>, <vinod.koul@...el.com>,
<shawn.guo@...aro.org>, <kernel@...gutronix.de>,
<eric.miao@...aro.org>, <patches@...aro.org>,
Richard Zhao <richard.zhao@...aro.org>
Subject: [PATCH v2 2/6] dma/imx-sdma: use readl_relaxed/writel_relaxed and use writel when necessary
use readl_relaxed/writel_relaxed in most places, and use writel when
enable channel, because it needs memory barrier.
Signed-off-by: Richard Zhao <richard.zhao@...aro.org>
---
drivers/dma/imx-sdma.c | 44 ++++++++++++++++++++++----------------------
1 files changed, 22 insertions(+), 22 deletions(-)
diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c
index c2bc4f1..63f4752 100644
--- a/drivers/dma/imx-sdma.c
+++ b/drivers/dma/imx-sdma.c
@@ -368,9 +368,9 @@ static int sdma_config_ownership(struct sdma_channel *sdmac,
if (event_override && mcu_override && dsp_override)
return -EINVAL;
- evt = __raw_readl(sdma->regs + SDMA_H_EVTOVR);
- mcu = __raw_readl(sdma->regs + SDMA_H_HOSTOVR);
- dsp = __raw_readl(sdma->regs + SDMA_H_DSPOVR);
+ evt = readl_relaxed(sdma->regs + SDMA_H_EVTOVR);
+ mcu = readl_relaxed(sdma->regs + SDMA_H_HOSTOVR);
+ dsp = readl_relaxed(sdma->regs + SDMA_H_DSPOVR);
if (dsp_override)
dsp &= ~(1 << channel);
@@ -387,16 +387,16 @@ static int sdma_config_ownership(struct sdma_channel *sdmac,
else
mcu |= (1 << channel);
- __raw_writel(evt, sdma->regs + SDMA_H_EVTOVR);
- __raw_writel(mcu, sdma->regs + SDMA_H_HOSTOVR);
- __raw_writel(dsp, sdma->regs + SDMA_H_DSPOVR);
+ writel_relaxed(evt, sdma->regs + SDMA_H_EVTOVR);
+ writel_relaxed(mcu, sdma->regs + SDMA_H_HOSTOVR);
+ writel_relaxed(dsp, sdma->regs + SDMA_H_DSPOVR);
return 0;
}
static void sdma_enable_channel(struct sdma_engine *sdma, int channel)
{
- __raw_writel(1 << channel, sdma->regs + SDMA_H_START);
+ writel(1 << channel, sdma->regs + SDMA_H_START);
}
/*
@@ -460,9 +460,9 @@ static void sdma_event_enable(struct sdma_channel *sdmac, unsigned int event)
u32 val;
u32 chnenbl = chnenbl_ofs(sdma, event);
- val = __raw_readl(sdma->regs + chnenbl);
+ val = readl_relaxed(sdma->regs + chnenbl);
val |= (1 << channel);
- __raw_writel(val, sdma->regs + chnenbl);
+ writel_relaxed(val, sdma->regs + chnenbl);
}
static void sdma_event_disable(struct sdma_channel *sdmac, unsigned int event)
@@ -472,9 +472,9 @@ static void sdma_event_disable(struct sdma_channel *sdmac, unsigned int event)
u32 chnenbl = chnenbl_ofs(sdma, event);
u32 val;
- val = __raw_readl(sdma->regs + chnenbl);
+ val = readl_relaxed(sdma->regs + chnenbl);
val &= ~(1 << channel);
- __raw_writel(val, sdma->regs + chnenbl);
+ writel_relaxed(val, sdma->regs + chnenbl);
}
static void sdma_handle_channel_loop(struct sdma_channel *sdmac)
@@ -552,8 +552,8 @@ static irqreturn_t sdma_int_handler(int irq, void *dev_id)
struct sdma_engine *sdma = dev_id;
u32 stat;
- stat = __raw_readl(sdma->regs + SDMA_H_INTR);
- __raw_writel(stat, sdma->regs + SDMA_H_INTR);
+ stat = readl_relaxed(sdma->regs + SDMA_H_INTR);
+ writel_relaxed(stat, sdma->regs + SDMA_H_INTR);
while (stat) {
int channel = fls(stat) - 1;
@@ -707,7 +707,7 @@ static void sdma_disable_channel(struct sdma_channel *sdmac)
struct sdma_engine *sdma = sdmac->sdma;
int channel = sdmac->channel;
- __raw_writel(1 << channel, sdma->regs + SDMA_H_STATSTOP);
+ writel_relaxed(1 << channel, sdma->regs + SDMA_H_STATSTOP);
sdmac->status = DMA_ERROR;
}
@@ -780,7 +780,7 @@ static int sdma_set_channel_priority(struct sdma_channel *sdmac,
return -EINVAL;
}
- __raw_writel(priority, sdma->regs + SDMA_CHNPRI_0 + 4 * channel);
+ writel_relaxed(priority, sdma->regs + SDMA_CHNPRI_0 + 4 * channel);
return 0;
}
@@ -1228,7 +1228,7 @@ static int __init sdma_init(struct sdma_engine *sdma)
clk_enable(sdma->clk);
/* Be sure SDMA has not started yet */
- __raw_writel(0, sdma->regs + SDMA_H_C0PTR);
+ writel_relaxed(0, sdma->regs + SDMA_H_C0PTR);
sdma->channel_control = dma_alloc_coherent(NULL,
MAX_DMA_CHANNELS * sizeof (struct sdma_channel_control) +
@@ -1251,11 +1251,11 @@ static int __init sdma_init(struct sdma_engine *sdma)
/* disable all channels */
for (i = 0; i < sdma->num_events; i++)
- __raw_writel(0, sdma->regs + chnenbl_ofs(sdma, i));
+ writel_relaxed(0, sdma->regs + chnenbl_ofs(sdma, i));
/* All channels have priority 0 */
for (i = 0; i < MAX_DMA_CHANNELS; i++)
- __raw_writel(0, sdma->regs + SDMA_CHNPRI_0 + i * 4);
+ writel_relaxed(0, sdma->regs + SDMA_CHNPRI_0 + i * 4);
ret = sdma_request_channel(&sdma->channel[0]);
if (ret)
@@ -1264,16 +1264,16 @@ static int __init sdma_init(struct sdma_engine *sdma)
sdma_config_ownership(&sdma->channel[0], false, true, false);
/* Set Command Channel (Channel Zero) */
- __raw_writel(0x4050, sdma->regs + SDMA_CHN0ADDR);
+ writel_relaxed(0x4050, sdma->regs + SDMA_CHN0ADDR);
/* Set bits of CONFIG register but with static context switching */
/* FIXME: Check whether to set ACR bit depending on clock ratios */
- __raw_writel(0, sdma->regs + SDMA_H_CONFIG);
+ writel_relaxed(0, sdma->regs + SDMA_H_CONFIG);
- __raw_writel(ccb_phys, sdma->regs + SDMA_H_C0PTR);
+ writel_relaxed(ccb_phys, sdma->regs + SDMA_H_C0PTR);
/* Set bits of CONFIG register with given context switching mode */
- __raw_writel(SDMA_H_CONFIG_CSM, sdma->regs + SDMA_H_CONFIG);
+ writel_relaxed(SDMA_H_CONFIG_CSM, sdma->regs + SDMA_H_CONFIG);
/* Initializes channel's priorities */
sdma_set_channel_priority(&sdma->channel[0], 7);
--
1.7.5.4
--
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