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UPSTREAM: sb/intel/common/gpio: Support ICH9M and prior

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Write gpio level twice to make sure the level is set
after pins have been configred as GPIO and to minimize
glitches on newer hardware.

Required to set correct GPIO layout on T500.

Tested on T500.

BUG=None
BRANCH=None
TEST=None

Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/18012
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins)

Change-Id: I691e672c7cb52ca51a80fd29657ada7488db0d41
Reviewed-on: https://chromium-review.googlesource.com/425269
Commit-Ready: Furquan Shaikh <furquan@chromium.org>
Tested-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
This commit is contained in:
Patrick Rudolph 2017-01-02 18:41:37 +01:00 • committed by chrome-bot
parent 04f16d5a2e
commit a485af6a82
1 changed files with 13 additions and 0 deletions
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13
src/southbridge/intel/common/gpio.c
View file

@ -37,6 +37,13 @@ void setup_pch_gpios(const struct pch_gpio_map *gpio)
{
u16 gpiobase = get_gpio_base();
/* The order of these calls does matter on ICH9M and prior.
* The level has to be set on pins configured as gpio,
* but on newer platforms we want to change the level first
* to make sure there are no glitches on the lines !
* Write the gpio level twice to satisfy both requirements.
*/
/* GPIO Set 1 */
if (gpio->set1.level)
outl(*((u32 *)gpio->set1.level), gpiobase + GP_LVL);
@ -44,6 +51,8 @@ void setup_pch_gpios(const struct pch_gpio_map *gpio)
outl(*((u32 *)gpio->set1.mode), gpiobase + GPIO_USE_SEL);
if (gpio->set1.direction)
outl(*((u32 *)gpio->set1.direction), gpiobase + GP_IO_SEL);
if (gpio->set1.level)
outl(*((u32 *)gpio->set1.level), gpiobase + GP_LVL);
if (gpio->set1.reset)
outl(*((u32 *)gpio->set1.reset), gpiobase + GP_RST_SEL1);
if (gpio->set1.invert)
@ -58,6 +67,8 @@ void setup_pch_gpios(const struct pch_gpio_map *gpio)
outl(*((u32 *)gpio->set2.mode), gpiobase + GPIO_USE_SEL2);
if (gpio->set2.direction)
outl(*((u32 *)gpio->set2.direction), gpiobase + GP_IO_SEL2);
if (gpio->set2.level)
outl(*((u32 *)gpio->set2.level), gpiobase + GP_LVL2);
if (gpio->set2.reset)
outl(*((u32 *)gpio->set2.reset), gpiobase + GP_RST_SEL2);
@ -68,6 +79,8 @@ void setup_pch_gpios(const struct pch_gpio_map *gpio)
outl(*((u32 *)gpio->set3.mode), gpiobase + GPIO_USE_SEL3);
if (gpio->set3.direction)
outl(*((u32 *)gpio->set3.direction), gpiobase + GP_IO_SEL3);
if (gpio->set3.level)
outl(*((u32 *)gpio->set3.level), gpiobase + GP_LVL3);
if (gpio->set3.reset)
outl(*((u32 *)gpio->set3.reset), gpiobase + GP_RST_SEL3);
}