dma: mv_xor: clear the window override control registers
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>
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@ -1240,6 +1240,8 @@ mv_xor_conf_mbus_windows(struct mv_xor_device *xordev,
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writel(win_enable, base + WINDOW_BAR_ENABLE(0));
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writel(win_enable, base + WINDOW_BAR_ENABLE(0));
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writel(win_enable, base + WINDOW_BAR_ENABLE(1));
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writel(win_enable, base + WINDOW_BAR_ENABLE(1));
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writel(0, base + WINDOW_OVERRIDE_CTRL(0));
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writel(0, base + WINDOW_OVERRIDE_CTRL(1));
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}
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}
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static int __devinit mv_xor_probe(struct platform_device *pdev)
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static int __devinit mv_xor_probe(struct platform_device *pdev)
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@ -53,6 +53,7 @@
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#define WINDOW_SIZE(w) (0x270 + ((w) << 2))
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#define WINDOW_SIZE(w) (0x270 + ((w) << 2))
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#define WINDOW_REMAP_HIGH(w) (0x290 + ((w) << 2))
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#define WINDOW_REMAP_HIGH(w) (0x290 + ((w) << 2))
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#define WINDOW_BAR_ENABLE(chan) (0x240 + ((chan) << 2))
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#define WINDOW_BAR_ENABLE(chan) (0x240 + ((chan) << 2))
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#define WINDOW_OVERRIDE_CTRL(chan) (0x2A0 + ((chan) << 2))
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struct mv_xor_device {
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struct mv_xor_device {
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void __iomem *xor_base;
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void __iomem *xor_base;
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