diff options
| author | Jan Samek <jan.samek@siemens.com> | 2023-04-12 14:36:02 +0200 |
|---|---|---|
| committer | Felix Held <felix-coreboot@felixheld.de> | 2023-05-08 13:11:22 +0000 |
| commit | e59f18bf29a8db4447100c57d3400ec432a94961 (patch) | |
| tree | 341552fe9873700dbdb3f8b843fbd0a94192d36b /src/drivers/i2c/pi608gp/pi608gp.h | |
| parent | 995772f0c3126672773983cb8e7a7d8f0b23b379 (diff) | |
drivers/i2c: Add PI7C9X2G608GP PCIe switch driver (pi608gp)
This patch adds some of the variety of configuration options exported
by the Pericom Inc. PI7C9X2G608GP PCIe switch over its SMBus interface.
Currently implemented options are only used to adjust the switch
upstream port amplitude and de-emphasis levels in millivolts. Only
values specified in the switch datasheet (in tables 6-6 and 6-8) are
allowed.
Example of a devicetree.cb entry:
chip drivers/i2c/pi608gp
register "gen2_3p5_enable" = "true"
register "gen2_3p5_amp" = "AMP_LVL_MV(425)"
register "gen2_3p5_deemph" = \
"DEEMPH_LVL_MV(37, 5)"
device i2c 0x6f on
ops pi608gp_ops
end
end
Link to the datasheet:
https://web.archive.org/web/20210225074853/https://www.diodes.com/assets/Datasheets/PI7C9X2G608GP.pdf
BUG=none
TEST=Create devicetree.cb and Kconfig entries for this driver
in a mainboard containing the switch and verify, that the values read
out from the switch config space match the values programmed over the
SMBus.
Change-Id: Id191c4e97b99da58efd3ba38bf8cca3603ece4d5
Signed-off-by: Jan Samek <jan.samek@siemens.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/74433
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-by: Mario Scheithauer <mario.scheithauer@siemens.com>
Diffstat (limited to 'src/drivers/i2c/pi608gp/pi608gp.h')
| -rw-r--r-- | src/drivers/i2c/pi608gp/pi608gp.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/src/drivers/i2c/pi608gp/pi608gp.h b/src/drivers/i2c/pi608gp/pi608gp.h new file mode 100644 index 0000000000..fe2776be01 --- /dev/null +++ b/src/drivers/i2c/pi608gp/pi608gp.h @@ -0,0 +1,12 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +#ifndef _I2C_PI608GP_H_ +#define _I2C_PI608GP_H_ + +/* Struct to store fixed-point millivolt values */ +struct deemph_lvl { uint32_t lvl, lvl_10; }; + +#define AMP_LVL_MV(_LVL) (_LVL) +#define DEEMPH_LVL_MV(_LVL, _LVL_10) { .lvl = _LVL, .lvl_10 = _LVL_10 } + +#endif |