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authorSascha Hauer <s.hauer@pengutronix.de>2012-03-07 12:30:06 +0400
committerSascha Hauer <s.hauer@pengutronix.de>2012-04-25 19:03:35 +0400
commit7560e3f3581ed415828d3f431b8622fa38c2d133 (patch)
tree30f51bce9a355a2fb3af7605bcd5ae48edc14903
parent66f75a5d028beaf67c931435fdc3e7823125730c (diff)
downloadlinux-7560e3f3581ed415828d3f431b8622fa38c2d133.tar.xz
dmaengine i.MX SDMA: do not depend on grouped clocks
the current i.MX clock support groups together unrelated clocks to a single clock which is then used by the driver. This can't be accomplished with the generic clock framework so we instead request the individual clocks in the driver. For i.MX there are generally three different clocks: ipg: bus clock (needed to access registers) ahb: dma relevant clock, sometimes referred to as hclk in the datasheet per: bit clock, pixel clock This patch changes the driver to request the individual clocks. Currently all clk_get will get the same clock until the SoCs are converted to the generic clock framework Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
-rw-r--r--drivers/dma/imx-sdma.c40
1 files changed, 28 insertions, 12 deletions
diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c
index d3e38e28bb6b..fddccae6b476 100644
--- a/drivers/dma/imx-sdma.c
+++ b/drivers/dma/imx-sdma.c
@@ -322,7 +322,8 @@ struct sdma_engine {
struct sdma_context_data *context;
dma_addr_t context_phys;
struct dma_device dma_device;
- struct clk *clk;
+ struct clk *clk_ipg;
+ struct clk *clk_ahb;
struct mutex channel_0_lock;
struct sdma_script_start_addrs *script_addrs;
};
@@ -859,7 +860,8 @@ static int sdma_alloc_chan_resources(struct dma_chan *chan)
sdmac->peripheral_type = data->peripheral_type;
sdmac->event_id0 = data->dma_request;
- clk_enable(sdmac->sdma->clk);
+ clk_enable(sdmac->sdma->clk_ipg);
+ clk_enable(sdmac->sdma->clk_ahb);
ret = sdma_request_channel(sdmac);
if (ret)
@@ -896,7 +898,8 @@ static void sdma_free_chan_resources(struct dma_chan *chan)
dma_free_coherent(NULL, PAGE_SIZE, sdmac->bd, sdmac->bd_phys);
- clk_disable(sdma->clk);
+ clk_disable(sdma->clk_ipg);
+ clk_disable(sdma->clk_ahb);
}
static struct dma_async_tx_descriptor *sdma_prep_slave_sg(
@@ -1169,12 +1172,14 @@ static void sdma_load_firmware(const struct firmware *fw, void *context)
addr = (void *)header + header->script_addrs_start;
ram_code = (void *)header + header->ram_code_start;
- clk_enable(sdma->clk);
+ clk_enable(sdma->clk_ipg);
+ clk_enable(sdma->clk_ahb);
/* download the RAM image for SDMA */
sdma_load_script(sdma, ram_code,
header->ram_code_size,
addr->ram_code_start_addr);
- clk_disable(sdma->clk);
+ clk_disable(sdma->clk_ipg);
+ clk_disable(sdma->clk_ahb);
sdma_add_scripts(sdma, addr);
@@ -1216,7 +1221,8 @@ static int __init sdma_init(struct sdma_engine *sdma)
return -ENODEV;
}
- clk_enable(sdma->clk);
+ clk_enable(sdma->clk_ipg);
+ clk_enable(sdma->clk_ahb);
/* Be sure SDMA has not started yet */
writel_relaxed(0, sdma->regs + SDMA_H_C0PTR);
@@ -1269,12 +1275,14 @@ static int __init sdma_init(struct sdma_engine *sdma)
/* Initializes channel's priorities */
sdma_set_channel_priority(&sdma->channel[0], 7);
- clk_disable(sdma->clk);
+ clk_disable(sdma->clk_ipg);
+ clk_disable(sdma->clk_ahb);
return 0;
err_dma_alloc:
- clk_disable(sdma->clk);
+ clk_disable(sdma->clk_ipg);
+ clk_disable(sdma->clk_ahb);
dev_err(sdma->dev, "initialisation failed with %d\n", ret);
return ret;
}
@@ -1313,12 +1321,21 @@ static int __init sdma_probe(struct platform_device *pdev)
goto err_request_region;
}
- sdma->clk = clk_get(&pdev->dev, NULL);
- if (IS_ERR(sdma->clk)) {
- ret = PTR_ERR(sdma->clk);
+ sdma->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
+ if (IS_ERR(sdma->clk_ipg)) {
+ ret = PTR_ERR(sdma->clk_ipg);
goto err_clk;
}
+ sdma->clk_ahb = devm_clk_get(&pdev->dev, "ahb");
+ if (IS_ERR(sdma->clk_ahb)) {
+ ret = PTR_ERR(sdma->clk_ahb);
+ goto err_clk;
+ }
+
+ clk_prepare(sdma->clk_ipg);
+ clk_prepare(sdma->clk_ahb);
+
sdma->regs = ioremap(iores->start, resource_size(iores));
if (!sdma->regs) {
ret = -ENOMEM;
@@ -1426,7 +1443,6 @@ err_alloc:
err_request_irq:
iounmap(sdma->regs);
err_ioremap:
- clk_put(sdma->clk);
err_clk:
release_mem_region(iores->start, resource_size(iores));
err_request_region: