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dma: mv_xor: clear the window override control registers

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The XOR channels on Marvell SoCs have a Window Override Control
register that allow to do some fancy things with addresses. Those
features are not used by the driver, but some U-Boot versions anyway
modify those registers.

For some reason, the U-Boot on OpenBlocks AX3-4 was setting an invalid
value in those registers when the addition 2 GB DRAM chip was plugged
into the board, causing the XOR driver to fail in using the XOR
engines.

By setting those registers to 0 during the driver initialization, we
ensure that the registers are configured according with the driver
operation model.

Thanks to Lior Amsalem <alior@marvell.com> for his help in debugging
this problem.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
This commit is contained in:
Thomas Petazzoni 2012-11-22 18:16:37 +01:00
parent 9f3410ff21
commit c4b4b732b2
2 changed files with 3 additions and 0 deletions
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2
drivers/dma/mv_xor.c
View File

@ -1240,6 +1240,8 @@ mv_xor_conf_mbus_windows(struct mv_xor_device *xordev,
writel(win_enable, base + WINDOW_BAR_ENABLE(0));
writel(win_enable, base + WINDOW_BAR_ENABLE(1));
writel(0, base + WINDOW_OVERRIDE_CTRL(0));
writel(0, base + WINDOW_OVERRIDE_CTRL(1));
}
static int __devinit mv_xor_probe(struct platform_device *pdev)

1
drivers/dma/mv_xor.h
View File

@ -53,6 +53,7 @@
#define WINDOW_SIZE(w) (0x270 + ((w) << 2))
#define WINDOW_REMAP_HIGH(w) (0x290 + ((w) << 2))
#define WINDOW_BAR_ENABLE(chan) (0x240 + ((chan) << 2))
#define WINDOW_OVERRIDE_CTRL(chan) (0x2A0 + ((chan) << 2))
struct mv_xor_device {
void __iomem *xor_base;