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usb: PS3 EHCI HC reset work-around
PS3 EHCI HC errata fix 316 - The PS3 EHCI HC will reset its internal INSNREGXX setup regs back to the chip default values on Host Controller Reset (CMD_RESET) or Light Host Controller Reset (CMD_LRESET). The work-around for this is for the HC driver to re-initialise these regs when ever the HC is reset. Adds a new helper routine ps3_ehci_setup_insnreg() which is called from ps3_ehci_hc_reset(). Signed-off-by: Geoff Levand <geoff@infradead.org> Acked-by: Alan Stern <stern@rowland.harvard.edu>
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@ -21,6 +21,34 @@
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#include <asm/firmware.h>
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#include <asm/ps3.h>
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static void ps3_ehci_setup_insnreg(struct ehci_hcd *ehci)
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{
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/* PS3 HC internal setup register offsets. */
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enum ps3_ehci_hc_insnreg {
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ps3_ehci_hc_insnreg01 = 0x084,
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ps3_ehci_hc_insnreg02 = 0x088,
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ps3_ehci_hc_insnreg03 = 0x08c,
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};
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/* PS3 EHCI HC errata fix 316 - The PS3 EHCI HC will reset its
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* internal INSNREGXX setup regs back to the chip default values
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* on Host Controller Reset (CMD_RESET) or Light Host Controller
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* Reset (CMD_LRESET). The work-around for this is for the HC
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* driver to re-initialise these regs when ever the HC is reset.
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*/
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/* Set burst transfer counts to 256 out, 32 in. */
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writel_be(0x01000020, (void __iomem *)ehci->regs +
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ps3_ehci_hc_insnreg01);
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/* Enable burst transfer counts. */
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writel_be(0x00000001, (void __iomem *)ehci->regs +
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ps3_ehci_hc_insnreg03);
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}
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static int ps3_ehci_hc_reset(struct usb_hcd *hcd)
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{
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int result;
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@ -49,6 +77,8 @@ static int ps3_ehci_hc_reset(struct usb_hcd *hcd)
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ehci_reset(ehci);
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ps3_ehci_setup_insnreg(ehci);
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return result;
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}
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