From 542b385a620a1783454a00424930e51895f45073 Mon Sep 17 00:00:00 2001 From: Matthias Fuchs Date: Tue, 7 Oct 2008 13:13:10 +0200 Subject: [PATCH] ppc4xx: Fix USB 2.0 phy reset sequence This patch fixes USB 2.0 communication issues on some DU440 boards. Signed-off-by: Matthias Fuchs Signed-off-by: Stefan Roese --- board/esd/du440/du440.c | 35 ++++++++++++++++++++++++++++++++--- 1 file changed, 32 insertions(+), 3 deletions(-) diff --git a/board/esd/du440/du440.c b/board/esd/du440/du440.c index 7df2adb238..6dca35d626 100644 --- a/board/esd/du440/du440.c +++ b/board/esd/du440/du440.c @@ -169,6 +169,7 @@ int misc_init_r(void) unsigned long usb2d0cr = 0; unsigned long usb2phy0cr, usb2h0cr = 0; unsigned long sdr0_pfc1; + unsigned long sdr0_srst0, sdr0_srst1; int i, j; /* adjust flash start and offset */ @@ -223,10 +224,38 @@ int misc_init_r(void) mtsdr(SDR0_USB2PHY0CR, usb2phy0cr); mtsdr(SDR0_USB2H0CR, usb2h0cr); - /* clear resets */ - udelay (1000); + /* + * Take USB out of reset: + * -Initial status = all cores are in reset + * -deassert reset to OPB1, P4OPB0, OPB2, PLB42OPB1 OPB2PLB40 cores + * -wait 1 ms + * -deassert reset to PHY + * -wait 1 ms + * -deassert reset to HOST + * -wait 4 ms + * -deassert all other resets + */ + mfsdr(SDR0_SRST1, sdr0_srst1); + sdr0_srst1 &= ~(SDR0_SRST1_OPBA1 | \ + SDR0_SRST1_P4OPB0 | \ + SDR0_SRST1_OPBA2 | \ + SDR0_SRST1_PLB42OPB1 | \ + SDR0_SRST1_OPB2PLB40); + mtsdr(SDR0_SRST1, sdr0_srst1); + udelay(1000); + + mfsdr(SDR0_SRST1, sdr0_srst1); + sdr0_srst1 &= ~SDR0_SRST1_USB20PHY; + mtsdr(SDR0_SRST1, sdr0_srst1); + udelay(1000); + + mfsdr(SDR0_SRST0, sdr0_srst0); + sdr0_srst0 &= ~SDR0_SRST0_USB2H; + mtsdr(SDR0_SRST0, sdr0_srst0); + udelay(4000); + + /* finally all the other resets */ mtsdr(SDR0_SRST1, 0x00000000); - udelay (1000); mtsdr(SDR0_SRST0, 0x00000000); printf("USB: Host(int phy)\n"); -- 2.39.5