diff options
| author | Tim Wawrzynczak <twawrzynczak@chromium.org> | 2021-03-22 10:43:42 -0600 |
|---|---|---|
| committer | Tim Wawrzynczak <twawrzynczak@chromium.org> | 2021-05-06 04:12:59 +0000 |
| commit | 59a621abc70464352eaf540bd6cb896935b9ba72 (patch) | |
| tree | fec081238c01e28e0d31733444ed7ec7d7695a61 /src/soc/intel/tigerlake/include | |
| parent | 6dc72022a5b8cfb0299e741b86d26b6a208838f1 (diff) | |
soc/intel/tgl,mb/google/volteer: Add API for Type-C aux bias pads
TGL boards using the Type-C subsystem for USB Type-C ports without a
retimer attached may require a DC bias on the aux lines for certain
modes to work. This patch adds native coreboot support for programming
the IOM to handle this DC bias via a simple devicetree
setting. Previously a UPD was required to tell the FSP which GPIOs were
used for the pullup and pulldown biases, but the API for this UPD was
effectively undocumented.
BUG=b:174116646
TEST=Verified on volteer2 that a Type-C flash drive is enumerated
succesfully on all ports. Verified all major power flows (boot, reboot,
powerdown and S0ix/suspend) still work as expected.
Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Change-Id: I70e36a41e760f4a435511c147cc5744a77dbccc0
Reviewed-on: https://review.coreboot.org/c/coreboot/+/51649
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Diffstat (limited to 'src/soc/intel/tigerlake/include')
| -rw-r--r-- | src/soc/intel/tigerlake/include/soc/tcss.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/src/soc/intel/tigerlake/include/soc/tcss.h b/src/soc/intel/tigerlake/include/soc/tcss.h new file mode 100644 index 0000000000..713528bdbb --- /dev/null +++ b/src/soc/intel/tigerlake/include/soc/tcss.h @@ -0,0 +1,12 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ + +#ifndef _SOC_TCSS_H_ +#define _SOC_TCSS_H_ + +/* IOM aux bias control registers in REGBAR MMIO space */ +#define IOM_AUX_BIAS_CTRL_PULLUP_OFFSET_0 0x1070 +#define IOM_AUX_BIAS_CTRL_PULLUP_OFFSET(x) (IOM_AUX_BIAS_CTRL_PULLUP_OFFSET_0 + (x) * 4) +#define IOM_AUX_BIAS_CTRL_PULLDOWN_OFFSET_0 0x1088 +#define IOM_AUX_BIAS_CTRL_PULLDOWN_OFFSET(x) (IOM_AUX_BIAS_CTRL_PULLDOWN_OFFSET_0 + (x) * 4) + +#endif /* _SOC_TCSS_H_ */ |