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drivers: usb: device: Add support for USB FS on STM32H7.

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* Assumes that the USB2_OTG peripheral is being used in FS mode, as on
  the NUCLEO-H743/753.
* Disable ULPI on USB2_OTFG, enable FS clk.
* Enable USB voltage detect and disable USB reg, per STM app notes.

Signed-off-by: Jeremy Wood <jeremy@bcdevices.com>
This commit is contained in:
Jeremy Wood 2021-03-24 11:44:54 -07:00 • committed by Anas Nashif
commit 5164d65269
1 changed files with 25 additions and 2 deletions
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27
drivers/usb/device/usb_dc_stm32.c
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@ -198,7 +198,9 @@ static int usb_dc_stm32_clock_enable(void)
* that instead. Example reference manual RM0360 for
* STM32F030x4/x6/x8/xC and STM32F070x6/xB.
*/
#if defined(RCC_HSI48_SUPPORT) || defined(CONFIG_SOC_SERIES_STM32WBX)
#if defined(RCC_HSI48_SUPPORT) || \
defined(CONFIG_SOC_SERIES_STM32WBX) || \
defined(CONFIG_SOC_SERIES_STM32H7X)
/*
* In STM32L0 series, HSI48 requires VREFINT and its buffer
@ -321,7 +323,7 @@ static uint32_t usb_dc_stm32_get_maximum_speed(void)
if (!strncmp(USB_MAXIMUM_SPEED, "high-speed", 10)) {
speed = USB_OTG_SPEED_HIGH;
} else if (!strncmp(USB_MAXIMUM_SPEED, "full-speed", 10)) {
#if USB_OTG_HS_EMB_PHY
#if defined(CONFIG_SOC_SERIES_STM32H7X) || defined(USB_OTG_HS_EMB_PHY)
speed = USB_OTG_SPEED_HIGH_IN_FULL;
#else
speed = USB_OTG_SPEED_FULL;
@ -375,6 +377,27 @@ static int usb_dc_stm32_init(void)
usb_dc_stm32_state.pcd.Init.Sof_enable = 1;
#endif /* CONFIG_USB_DEVICE_SOF */
#if defined(CONFIG_SOC_SERIES_STM32H7X)
/* Currently assuming FS mode. Need to disable the ULPI clock on USB2 and
* enable the FS clock. Need to make this dependent on HS or FS config.
*/
LL_AHB1_GRP1_DisableClock(LL_AHB1_GRP1_PERIPH_USB2OTGHSULPI);
LL_AHB1_GRP1_DisableClockSleep(LL_AHB1_GRP1_PERIPH_USB2OTGHSULPI);
LL_AHB1_GRP1_EnableClock(LL_AHB1_GRP1_PERIPH_USB2OTGHS);
LL_AHB1_GRP1_EnableClockSleep(LL_AHB1_GRP1_PERIPH_USB2OTGHS);
LL_PWR_EnableUSBVoltageDetector();
/* Per AN2606: USBREGEN not supported when running in FS mode. */
LL_PWR_DisableUSBReg();
while (!LL_PWR_IsActiveFlag_USB()) {
LOG_INF("PWR not active yet");
k_sleep(K_MSEC(100));
}
#endif
LOG_DBG("Pinctrl signals configuration");
status = stm32_dt_pinctrl_configure(usb_pinctrl,
ARRAY_SIZE(usb_pinctrl),