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usb: sam0: Add support for MCLK

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On newer sam0 SoCs peripherals are enabled through the MCLK
instead of the PM register.

Use the MCLK register if it's availiable.

Signed-off-by: Benjamin Valentin <benpicco@googlemail.com>
This commit is contained in:
Benjamin Valentin 2019-11-06 21:24:01 +01:00 • committed by Carles Cufí
commit e0b94e92d5
1 changed files with 12 additions and 0 deletions
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12
drivers/usb/device/usb_dc_sam0.c
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@ -180,6 +180,17 @@ int usb_dc_attach(void)
UsbDevice *regs = &REGS->DEVICE;
struct usb_sam0_data *data = usb_sam0_get_data();
#ifdef MCLK
/* Enable the clock in MCLK */
MCLK->APBBMASK.bit.USB_ = 1;
/* Enable the GCLK - use 48 MHz source */
GCLK->PCHCTRL[USB_GCLK_ID].reg = GCLK_PCHCTRL_GEN(2)
| GCLK_PCHCTRL_CHEN;
while (GCLK->SYNCBUSY.reg) {
}
#else
/* Enable the clock in PM */
PM->APBBMASK.bit.USB_ = 1;
@ -189,6 +200,7 @@ int usb_dc_attach(void)
while (GCLK->STATUS.bit.SYNCBUSY) {
}
#endif /* !MCLK */
/* Configure */
regs->CTRLA.bit.SWRST = 1;