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

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.

Change-Id: I691e672c7cb52ca51a80fd29657ada7488db0d41
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)
This commit is contained in:
Patrick Rudolph 2017-01-02 18:41:37 +01:00 committed by Nico Huber
parent 2ed7295cd9
commit df369af79e
1 changed files with 13 additions and 0 deletions
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13
src/southbridge/intel/common/gpio.c
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@ -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);
}