Board: stm32mp1: Add supply current boot information

For DK1/DK2 boards, check if power supply provides enough current
to allow the board to boot correctly.
ADC@0 channel 18 and 19 are connected to USB type-C CC1 and CC2
signals. The table below shows the behavior for different range of
CC1 or CC2:

  range       | power supply | red led |          console message
  (Volts)     |   (Amps)     | blinks  |
--------------|--------------|---------|-----------------------------------
[2.10 - 1.23[ |     3        |   NO    |    NO
[1.23 - 0.66[ |     1.5      | 3 times | WARNING 1.5A power supply detected
[0.66 - 0]    |     0.5      | 2 times | WARNING 500mA power supply detected

If detected current is < 3A, red led is kept ON after blinking.

Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
This commit is contained in:
Patrice Chotard 2019-02-12 16:50:40 +01:00 committed by Patrick Delaunay
parent 3911048457
commit 395f12976c

View file

@ -2,9 +2,10 @@
/*
* Copyright (C) 2018, STMicroelectronics - All Rights Reserved
*/
#include <common.h>
#include <adc.h>
#include <config.h>
#include <clk.h>
#include <common.h>
#include <dm.h>
#include <generic-phy.h>
#include <led.h>
@ -62,6 +63,10 @@ DECLARE_GLOBAL_DATA_PTR;
#define STM32MP_GGPIO 0x38
#define STM32MP_GGPIO_VBUS_SENSING BIT(21)
#define USB_WARNING_LOW_THRESHOLD_UV 660000
#define USB_START_LOW_THRESHOLD_UV 1230000
#define USB_START_HIGH_THRESHOLD_UV 2100000
int checkboard(void)
{
int ret;
@ -294,6 +299,145 @@ clk_err:
return ret;
}
static int get_led(struct udevice **dev, char *led_string)
{
char *led_name;
int ret;
led_name = fdtdec_get_config_string(gd->fdt_blob, led_string);
if (!led_name) {
pr_debug("%s: could not find %s config string\n",
__func__, led_string);
return -ENOENT;
}
ret = led_get_by_label(led_name, dev);
if (ret) {
debug("%s: get=%d\n", __func__, ret);
return ret;
}
return 0;
}
static int setup_led(enum led_state_t cmd)
{
struct udevice *dev;
int ret;
ret = get_led(&dev, "u-boot,boot-led");
if (ret)
return ret;
ret = led_set_state(dev, cmd);
return ret;
}
static int board_check_usb_power(void)
{
struct ofnode_phandle_args adc_args;
struct udevice *adc;
struct udevice *led;
ofnode node;
unsigned int raw;
int max_uV = 0;
int ret, uV, adc_count;
u8 i, nb_blink;
node = ofnode_path("/config");
if (!ofnode_valid(node)) {
debug("%s: no /config node?\n", __func__);
return -ENOENT;
}
/*
* Retrieve the ADC channels devices and get measurement
* for each of them
*/
adc_count = ofnode_count_phandle_with_args(node, "st,adc_usb_pd",
"#io-channel-cells");
if (adc_count < 0) {
if (adc_count == -ENOENT)
return 0;
pr_err("%s: can't find adc channel (%d)\n", __func__,
adc_count);
return adc_count;
}
for (i = 0; i < adc_count; i++) {
if (ofnode_parse_phandle_with_args(node, "st,adc_usb_pd",
"#io-channel-cells", 0, i,
&adc_args)) {
pr_debug("%s: can't find /config/st,adc_usb_pd\n",
__func__);
return 0;
}
ret = uclass_get_device_by_ofnode(UCLASS_ADC, adc_args.node,
&adc);
if (ret) {
pr_err("%s: Can't get adc device(%d)\n", __func__,
ret);
return ret;
}
ret = adc_channel_single_shot(adc->name, adc_args.args[0],
&raw);
if (ret) {
pr_err("%s: single shot failed for %s[%d]!\n",
__func__, adc->name, adc_args.args[0]);
return ret;
}
/* Convert to uV */
if (!adc_raw_to_uV(adc, raw, &uV)) {
if (uV > max_uV)
max_uV = uV;
pr_debug("%s: %s[%02d] = %u, %d uV\n", __func__,
adc->name, adc_args.args[0], raw, uV);
} else {
pr_err("%s: Can't get uV value for %s[%d]\n",
__func__, adc->name, adc_args.args[0]);
}
}
/*
* If highest value is inside 1.23 Volts and 2.10 Volts, that means
* board is plugged on an USB-C 3A power supply and boot process can
* continue.
*/
if (max_uV > USB_START_LOW_THRESHOLD_UV &&
max_uV < USB_START_HIGH_THRESHOLD_UV)
return 0;
/* Display warning message and make u-boot,error-led blinking */
pr_err("\n*******************************************\n");
if (max_uV < USB_WARNING_LOW_THRESHOLD_UV) {
pr_err("* WARNING 500mA power supply detected *\n");
nb_blink = 2;
} else {
pr_err("* WARNING 1.5A power supply detected *\n");
nb_blink = 3;
}
pr_err("* Current too low, use a 3A power supply! *\n");
pr_err("*******************************************\n\n");
ret = get_led(&led, "u-boot,error-led");
if (ret)
return ret;
for (i = 0; i < nb_blink * 2; i++) {
led_set_state(led, LEDST_TOGGLE);
mdelay(125);
}
led_set_state(led, LEDST_ON);
return 0;
}
int board_usb_cleanup(int index, enum usb_init_type init)
{
/* Reset usbotg */
@ -428,5 +572,13 @@ int board_late_init(void)
}
#endif
/* for DK1/DK2 boards */
board_check_usb_power();
return 0;
}
void board_quiesce_devices(void)
{
setup_led(LEDST_OFF);
}