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skylake: provide GPE0 routing devicetree configuration

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On skylake the GPE0 routing can be dynamically changed to
a particular GPIO group. Provide the ability for the mainboard
to set the route accordingly. If any of the values in the
devicetree are the same the current setting in the PMC register
is used. The GPIO communities need to have matching configuration
for the plumbing to work properly.

BUG=chrome-os-partner:43778
BRANCH=None
TEST=Built and booted glados w/ and w/o devicetree changes. Fields
     are set accordingly.

Original-Change-Id: I263d648c8ea8a70b21570f01b333d05a5fa2a4e3
Original-Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/291930
Original-Reviewed-by: Duncan Laurie <dlaurie@chromium.org>

Change-Id: I966d38bc197dbb52a2ba50927c06e243e169afbe
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/11203
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
This commit is contained in:
Aaron Durbin
2015-08-07 22:29:42 -05:00
parent 799bf781fd
commit 9a8dc37cdd
6 changed files with 119 additions and 15 deletions
Download Patch File Download Diff File Expand all files Collapse all files

43
src/soc/intel/skylake/pmc.c
View File

@ -27,6 +27,7 @@
#include <pc80/mc146818rtc.h>
#include <reg_script.h>
#include <string.h>
#include <soc/gpio.h>
#include <soc/iomap.h>
#include <soc/pci_devs.h>
#include <soc/pmc.h>
@ -147,6 +148,42 @@ static void pch_rtc_init(void)
#endif
}
static void pmc_gpe_init(config_t *config)
{
uint8_t *pmc_regs;
uint32_t gpio_cfg;
uint32_t gpio_cfg_reg;
const uint32_t gpio_cfg_mask =
(GPE0_DWX_MASK << GPE0_DW0_SHIFT) |
(GPE0_DWX_MASK << GPE0_DW1_SHIFT) |
(GPE0_DWX_MASK << GPE0_DW2_SHIFT);
pmc_regs = pmc_mmio_regs();
gpio_cfg = 0;
/* Route the GPIOs to the GPE0 block. Determine that all values
* are different, and if they aren't use the reset values. */
if (config->gpe0_dw0 == config->gpe0_dw1 ||
config->gpe0_dw1 == config->gpe0_dw2) {
printk(BIOS_INFO, "PMC: Using default GPE route.\n");
gpio_cfg = read32(pmc_regs + GPIO_CFG);
} else {
gpio_cfg |= (uint32_t)config->gpe0_dw0 << GPE0_DW0_SHIFT;
gpio_cfg |= (uint32_t)config->gpe0_dw1 << GPE0_DW1_SHIFT;
gpio_cfg |= (uint32_t)config->gpe0_dw2 << GPE0_DW2_SHIFT;
}
gpio_cfg_reg = read32(pmc_regs + GPIO_CFG) & ~gpio_cfg_mask;
gpio_cfg_reg |= gpio_cfg & gpio_cfg_mask;
write32(pmc_regs + GPIO_CFG, gpio_cfg_reg);
/* Set the routes in the GPIO communities as well. */
gpio_route_gpe(gpio_cfg_reg >> GPE0_DW0_SHIFT);
/* Set GPE enables based on devictree. */
enable_all_gpe(config->gpe0_en_1, config->gpe0_en_2,
config->gpe0_en_3, config->gpe0_en_4);
}
static void pch_power_options(void)
{
u16 reg16;
@ -187,9 +224,9 @@ static void pch_power_options(void)
}
pci_write_config16(dev, GEN_PMCON_B, reg16);
printk(BIOS_INFO, "Set power %s after power failure.\n", state);
/* GPE setup based on device tree configuration */
enable_all_gpe(config->gpe0_en_1, config->gpe0_en_2,
config->gpe0_en_3, config->gpe0_en_4);
/* Set up GPE configuration. */
pmc_gpe_init(config);
/* SMI setup based on device tree configuration */
enable_alt_smi(config->ec_smi_gpio, config->alt_gp_smi_en);