diff options
Diffstat (limited to 'chip/g/jtag.c')
| -rw-r--r-- | chip/g/jtag.c | 27 |
1 files changed, 25 insertions, 2 deletions
diff --git a/chip/g/jtag.c b/chip/g/jtag.c index b80bca1b8d..c835e743d8 100644 --- a/chip/g/jtag.c +++ b/chip/g/jtag.c @@ -1,9 +1,32 @@ -/* Copyright (c) 2014 The Chromium OS Authors. All rights reserved. +/* Copyright 2016 The Chromium OS Authors. All rights reserved. * Use of this source code is governed by a BSD-style license that can be * found in the LICENSE file. */ +#include "registers.h" + void jtag_pre_init(void) { - /* I don't think we need this to do anything */ + /* + * We don't need to do anything for JTAG, but if we're resuming from + * deep sleep we need to undo some stuff as soon as possible and this + * is the first init function that's called. + * + * It doesn't hurt anything if this setup is not needed, but we don't + * investigate the reset cause until much later (and doing so is + * destructive), so we'll just do the post-deep-sleep setup every time. + */ + + /* Disable the deep sleep triggers */ + GR_PMU_LOW_POWER_DIS = 0; + GR_PMU_EXITPD_MASK = 0; + + /* Unfreeze the USB module */ + GWRITE_FIELD(USB, PCGCCTL, STOPPCLK, 0); + GWRITE_FIELD(USB, PCGCCTL, RSTPDWNMODULE, 0); + GWRITE_FIELD(USB, PCGCCTL, PWRCLMP, 0); + + /* Unfreeze the PINMUX */ + GREG32(PINMUX, EXITEN0) = 0; + GREG32(PINMUX, HOLD) = 0; } |