diff options
Diffstat (limited to 'drivers/chibios/usbpd_stm32g4.c')
| -rw-r--r-- | drivers/chibios/usbpd_stm32g4.c | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/drivers/chibios/usbpd_stm32g4.c b/drivers/chibios/usbpd_stm32g4.c new file mode 100644 index 0000000000..f16ca8aeae --- /dev/null +++ b/drivers/chibios/usbpd_stm32g4.c @@ -0,0 +1,76 @@ +/* Copyright 2021 Nick Brassel (@tzarc) + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <quantum.h> + +#ifndef USBPD_UCPD1_CFG1 +# define USBPD_UCPD1_CFG1 (UCPD_CFG1_PSC_UCPDCLK_0 | UCPD_CFG1_TRANSWIN_3 | UCPD_CFG1_IFRGAP_4 | UCPD_CFG1_HBITCLKDIV_4) +#endif // USBPD_UCPD1_CFG1 + +// Initialises the USBPD subsystem +__attribute__((weak)) void usbpd_init(void) { + // Disable dead-battery signals + PWR->CR3 |= PWR_CR3_UCPD_DBDIS; + // Enable the clock for the UCPD1 peripheral + RCC->APB1ENR2 |= RCC_APB1ENR2_UCPD1EN; + + // Copy the existing value + uint32_t CFG1 = UCPD1->CFG1; + // Force-disable UCPD1 before configuring + CFG1 &= ~UCPD_CFG1_UCPDEN; + // Configure UCPD1 + CFG1 = USBPD_UCPD1_CFG1; + // Apply the changes + UCPD1->CFG1 = CFG1; + // Enable UCPD1 + UCPD1->CFG1 |= UCPD_CFG1_UCPDEN; + + // Copy the existing value + uint32_t CR = UCPD1->CR; + // Clear out ANASUBMODE (irrelevant as a sink device) + CR &= ~UCPD_CR_ANASUBMODE_Msk; + // Advertise our capabilities as a sink, with both CC lines enabled + CR |= UCPD_CR_ANAMODE | UCPD_CR_CCENABLE_Msk; + // Apply the changes + UCPD1->CR = CR; +} + +// Gets the current state of the USBPD allowance +__attribute__((weak)) usbpd_allowance_t usbpd_get_allowance(void) { + uint32_t CR = UCPD1->CR; + + int ucpd_enabled = (UCPD1->CFG1 & UCPD_CFG1_UCPDEN_Msk) >> UCPD_CFG1_UCPDEN_Pos; + int anamode = (CR & UCPD_CR_ANAMODE_Msk) >> UCPD_CR_ANAMODE_Pos; + int cc_enabled = (CR & UCPD_CR_CCENABLE_Msk) >> UCPD_CR_CCENABLE_Pos; + + if (ucpd_enabled && anamode && cc_enabled) { + uint32_t SR = UCPD1->SR; + int vstate_cc1 = (SR & UCPD_SR_TYPEC_VSTATE_CC1_Msk) >> UCPD_SR_TYPEC_VSTATE_CC1_Pos; + int vstate_cc2 = (SR & UCPD_SR_TYPEC_VSTATE_CC2_Msk) >> UCPD_SR_TYPEC_VSTATE_CC2_Pos; + int vstate_max = vstate_cc1 > vstate_cc2 ? vstate_cc1 : vstate_cc2; + switch (vstate_max) { + case 0: + case 1: + return USBPD_500MA; // Note that this is 500mA (i.e. max USB 2.0), not 900mA, as we're not using USB 3.1 as a sink device. + case 2: + return USBPD_1500MA; + case 3: + return USBPD_3000MA; + } + } + + return USBPD_500MA; +}
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