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/* Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/* USB Power delivery board configuration */
#ifndef __USB_PD_CONFIG_H
#define __USB_PD_CONFIG_H
/* Timer selection for baseband PD communication */
#define TIM_CLOCK_PD_TX 14
#define TIM_CLOCK_PD_RX 3
/* use the hardware accelerator for CRC */
#define CONFIG_HW_CRC
/* TX is using SPI1 on PA4-6 */
#define SPI_REGS STM32_SPI1_REGS
#define DMAC_SPI_TX STM32_DMAC_CH3
static inline void spi_enable_clock(void)
{
/* Already done in hardware_init() */
}
/* RX is on TIM3 CH1 connected to TIM3 CH2 pin (PA7, not internal COMP) */
#define DMAC_TIM_RX STM32_DMAC_CH4
#define TIM_CCR_IDX 1
/* connect TIM3 CH1 to TIM3_CH2 input */
#define TIM_CCR_CS 2
#define EXTI_COMP_MASK (1 << 7)
#define IRQ_COMP STM32_IRQ_EXTI4_15
/* the RX is inverted, triggers on rising edge */
#define EXTI_XTSR STM32_EXTI_RTSR
/* Clock divider for RX edges timings (2.4Mhz counter from 48Mhz clock) */
#define RX_CLOCK_DIV (20 - 1)
/* the pins used for communication need to be hi-speed */
static inline void pd_set_pins_speed(void)
{
/* Already done in hardware_init() */
}
/* Drive the CC line from the TX block */
static inline void pd_tx_enable(int polarity)
{
/* Drive TX GND on PA4 */
STM32_GPIO_BSRR(GPIO_A) = 1 << (4 + 16 /* Reset */);
/* Drive SPI MISO on PA6 by putting it in AF mode */
STM32_GPIO_MODER(GPIO_A) |= 0x2 << (2*6);
}
/* Put the TX driver in Hi-Z state */
static inline void pd_tx_disable(int polarity)
{
/* Put TX GND (PA4) in Hi-Z state */
STM32_GPIO_BSRR(GPIO_A) = 1 << 4 /* Set */;
/* Put SPI MISO (PA6) in Hi-Z by putting it in input mode */
STM32_GPIO_MODER(GPIO_A) &= ~(0x3 << (2*6));
}
/* we know the plug polarity, do the right configuration */
static inline void pd_select_polarity(int polarity)
{
/* captive cable : no polarity */
}
/* Initialize pins used for TX and put them in Hi-Z */
static inline void pd_tx_init(void)
{
/* Already done in hardware_init() */
}
/* 3.0A DFP : no-connect voltage is 2.45V */
#define PD_SRC_VNC (2450 /*mV*/ * 4096 / 3300/* 12-bit ADC with 3.3V range */)
/* we are a power supply, boot as a power source waiting for a sink */
#define PD_DEFAULT_STATE PD_STATE_SRC_DISCONNECTED
/* delay necessary for the voltage transition on the power supply */
#define PD_POWER_SUPPLY_TRANSITION_DELAY 50000 /* us */
#endif /* __USB_PD_CONFIG_H */
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