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eve: Use ternary encoding for board version

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The Eve board version will use Hi-Z to get 3 values out of
each bit in the version.  In order to support this read each
strap and determine the ternary encoding.

BUG=chrome-os-partner:58666
BRANCH=none
TEST=ensure P0 reports 0 and P1 reports 1, test with an unused
GPIO to ensure that a tristate pin will also be read properly.

Change-Id: Ib1f569e2b06bed0995eb70f24c90533cbccb0fb8
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/418978
Reviewed-by: Scott Collyer <scollyer@chromium.org>
This commit is contained in:
Duncan Laurie
2016-12-12 09:59:59 -08:00
committed by chrome-bot
parent fffc34706d
commit aff701c574
2 changed files with 46 additions and 0 deletions
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44
board/eve/board.c
View File

@@ -590,6 +590,50 @@ void board_hibernate(void)
bd9995x_set_power_save_mode(BD9995X_PWR_SAVE_MAX);
}
static int gpio_get_ternary(enum gpio_signal gpio)
{
int pd, pu;
int flags = gpio_get_default_flags(gpio);
/* Read GPIO with internal pull-down */
gpio_set_flags(gpio, GPIO_INPUT | GPIO_PULL_DOWN);
pd = gpio_get_level(gpio);
usleep(100);
/* Read GPIO with internal pull-up */
gpio_set_flags(gpio, GPIO_INPUT | GPIO_PULL_UP);
pu = gpio_get_level(gpio);
usleep(100);
/* Reset GPIO flags */
gpio_set_flags(gpio, flags);
/* Check PU and PD readings to determine tristate */
return pu && !pd ? 2 : pd;
}
int board_get_version(void)
{
static int ver;
if (!ver) {
/*
* Read the board EC ID on the tristate strappings
* using ternary encoding: 0 = 0, 1 = 1, Hi-Z = 2
*/
uint8_t id0, id1, id2;
id0 = gpio_get_ternary(GPIO_BOARD_VERSION1);
id1 = gpio_get_ternary(GPIO_BOARD_VERSION2);
id2 = gpio_get_ternary(GPIO_BOARD_VERSION3);
ver = (id2 * 9) + (id1 * 3) + id0;
CPRINTS("Board ID = %d", ver);
}
return ver;
}
/* Base Sensor mutex */
static struct mutex g_base_mutex;

2
board/eve/board.h
View File

@@ -18,6 +18,7 @@
#define CONFIG_ADC
#define CONFIG_BOARD_HAS_BEFORE_RSMRST
#define CONFIG_BOARD_VERSION
#define CONFIG_BOARD_SPECIFIC_VERSION
#define CONFIG_BUTTON_COUNT 2
#define CONFIG_CASE_CLOSED_DEBUG_EXTERNAL
#define CONFIG_DPTF
@@ -241,6 +242,7 @@ enum adc_channel {
#define PD_MAX_VOLTAGE_MV 20000
/* Board specific handlers */
int board_get_version(void);
void board_reset_pd_mcu(void);
void board_set_tcpc_power_mode(int port, int mode);
void board_print_tcpc_fw_version(int port);