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https://github.com/AsahiLinux/u-boot
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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
Patrick Delaunay
parent
3911048457
commit
395f12976c
1 changed files with 153 additions and 1 deletions
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@ -2,9 +2,10 @@
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/*
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* Copyright (C) 2018, STMicroelectronics - All Rights Reserved
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*/
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#include <common.h>
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#include <adc.h>
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#include <config.h>
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#include <clk.h>
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#include <common.h>
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#include <dm.h>
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#include <generic-phy.h>
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#include <led.h>
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@ -62,6 +63,10 @@ DECLARE_GLOBAL_DATA_PTR;
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#define STM32MP_GGPIO 0x38
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#define STM32MP_GGPIO_VBUS_SENSING BIT(21)
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#define USB_WARNING_LOW_THRESHOLD_UV 660000
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#define USB_START_LOW_THRESHOLD_UV 1230000
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#define USB_START_HIGH_THRESHOLD_UV 2100000
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int checkboard(void)
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{
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int ret;
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@ -294,6 +299,145 @@ clk_err:
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return ret;
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}
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static int get_led(struct udevice **dev, char *led_string)
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{
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char *led_name;
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int ret;
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led_name = fdtdec_get_config_string(gd->fdt_blob, led_string);
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if (!led_name) {
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pr_debug("%s: could not find %s config string\n",
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__func__, led_string);
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return -ENOENT;
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}
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ret = led_get_by_label(led_name, dev);
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if (ret) {
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debug("%s: get=%d\n", __func__, ret);
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return ret;
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}
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return 0;
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}
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static int setup_led(enum led_state_t cmd)
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{
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struct udevice *dev;
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int ret;
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ret = get_led(&dev, "u-boot,boot-led");
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if (ret)
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return ret;
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ret = led_set_state(dev, cmd);
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return ret;
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}
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static int board_check_usb_power(void)
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{
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struct ofnode_phandle_args adc_args;
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struct udevice *adc;
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struct udevice *led;
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ofnode node;
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unsigned int raw;
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int max_uV = 0;
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int ret, uV, adc_count;
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u8 i, nb_blink;
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node = ofnode_path("/config");
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if (!ofnode_valid(node)) {
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debug("%s: no /config node?\n", __func__);
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return -ENOENT;
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}
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/*
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* Retrieve the ADC channels devices and get measurement
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* for each of them
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*/
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adc_count = ofnode_count_phandle_with_args(node, "st,adc_usb_pd",
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"#io-channel-cells");
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if (adc_count < 0) {
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if (adc_count == -ENOENT)
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return 0;
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pr_err("%s: can't find adc channel (%d)\n", __func__,
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adc_count);
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return adc_count;
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}
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for (i = 0; i < adc_count; i++) {
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if (ofnode_parse_phandle_with_args(node, "st,adc_usb_pd",
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"#io-channel-cells", 0, i,
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&adc_args)) {
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pr_debug("%s: can't find /config/st,adc_usb_pd\n",
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__func__);
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return 0;
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}
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ret = uclass_get_device_by_ofnode(UCLASS_ADC, adc_args.node,
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&adc);
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if (ret) {
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pr_err("%s: Can't get adc device(%d)\n", __func__,
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ret);
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return ret;
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}
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ret = adc_channel_single_shot(adc->name, adc_args.args[0],
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&raw);
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if (ret) {
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pr_err("%s: single shot failed for %s[%d]!\n",
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__func__, adc->name, adc_args.args[0]);
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return ret;
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}
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/* Convert to uV */
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if (!adc_raw_to_uV(adc, raw, &uV)) {
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if (uV > max_uV)
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max_uV = uV;
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pr_debug("%s: %s[%02d] = %u, %d uV\n", __func__,
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adc->name, adc_args.args[0], raw, uV);
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} else {
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pr_err("%s: Can't get uV value for %s[%d]\n",
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__func__, adc->name, adc_args.args[0]);
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}
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}
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/*
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* If highest value is inside 1.23 Volts and 2.10 Volts, that means
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* board is plugged on an USB-C 3A power supply and boot process can
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* continue.
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*/
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if (max_uV > USB_START_LOW_THRESHOLD_UV &&
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max_uV < USB_START_HIGH_THRESHOLD_UV)
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return 0;
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/* Display warning message and make u-boot,error-led blinking */
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pr_err("\n*******************************************\n");
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if (max_uV < USB_WARNING_LOW_THRESHOLD_UV) {
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pr_err("* WARNING 500mA power supply detected *\n");
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nb_blink = 2;
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} else {
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pr_err("* WARNING 1.5A power supply detected *\n");
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nb_blink = 3;
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}
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pr_err("* Current too low, use a 3A power supply! *\n");
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pr_err("*******************************************\n\n");
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ret = get_led(&led, "u-boot,error-led");
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if (ret)
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return ret;
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for (i = 0; i < nb_blink * 2; i++) {
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led_set_state(led, LEDST_TOGGLE);
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mdelay(125);
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}
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led_set_state(led, LEDST_ON);
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return 0;
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}
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int board_usb_cleanup(int index, enum usb_init_type init)
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{
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/* Reset usbotg */
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@ -428,5 +572,13 @@ int board_late_init(void)
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}
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#endif
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/* for DK1/DK2 boards */
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board_check_usb_power();
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return 0;
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}
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void board_quiesce_devices(void)
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{
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setup_led(LEDST_OFF);
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}
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