From 69cb1ec4ce4da4bc4c07bb09c4c98b3e25d99fb1 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Eric=20B=C3=A9nard?= Date: Fri, 15 Oct 2010 14:30:58 +0200 Subject: mxc_udc: add workaround for ENGcm09152 for i.MX35 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit this patch gives the possibility to workaround bug ENGcm09152 on i.MX35 when the hardware workaround is also implemented on the board. It covers the workaround described on page 25 of the following Errata : http://cache.freescale.com/files/dsp/doc/errata/IMX35CE.pdf Signed-off-by: Eric Bénard Signed-off-by: Greg Kroah-Hartman --- drivers/usb/gadget/fsl_mxc_udc.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) (limited to 'drivers/usb/gadget') diff --git a/drivers/usb/gadget/fsl_mxc_udc.c b/drivers/usb/gadget/fsl_mxc_udc.c index eafa6d2..5bdbfe6 100644 --- a/drivers/usb/gadget/fsl_mxc_udc.c +++ b/drivers/usb/gadget/fsl_mxc_udc.c @@ -22,6 +22,10 @@ static struct clk *mxc_ahb_clk; static struct clk *mxc_usb_clk; +/* workaround ENGcm09152 for i.MX35 */ +#define USBPHYCTRL_OTGBASE_OFFSET 0x608 +#define USBPHYCTRL_EVDO (1 << 23) + int fsl_udc_clk_init(struct platform_device *pdev) { struct fsl_usb2_platform_data *pdata; @@ -84,6 +88,17 @@ eenahb: void fsl_udc_clk_finalize(struct platform_device *pdev) { struct fsl_usb2_platform_data *pdata = pdev->dev.platform_data; +#if defined(CONFIG_ARCH_MX35) + unsigned int v; + + /* workaround ENGcm09152 for i.MX35 */ + if (pdata->workaround & FLS_USB2_WORKAROUND_ENGCM09152) { + v = readl(MX35_IO_ADDRESS(MX35_OTG_BASE_ADDR + + USBPHYCTRL_OTGBASE_OFFSET)); + writel(v | USBPHYCTRL_EVDO, MX35_IO_ADDRESS(MX35_OTG_BASE_ADDR + + USBPHYCTRL_OTGBASE_OFFSET)); + } +#endif /* ULPI transceivers don't need usbpll */ if (pdata->phy_mode == FSL_USB2_PHY_ULPI) { -- cgit v1.1