diff options
| author | Matthias Fuchs <matthias.fuchs@esd-electronics.com> | 2008-10-07 13:13:10 +0200 |
|---|---|---|
| committer | Stefan Roese <sr@denx.de> | 2008-10-10 09:38:36 +0200 |
| commit | 542b385a620a1783454a00424930e51895f45073 (patch) | |
| tree | 5860603b8403d68ab739c36bc3054cf5d1c3f4a7 | |
| parent | df8c1ce11114c2260dedb5547281945f7db8fa5c (diff) | |
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 <matthias.fuchs@esd-electronics.com>
Signed-off-by: Stefan Roese <sr@denx.de>
| -rw-r--r-- | board/esd/du440/du440.c | 35 |
1 files 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"); |