serial_stm32.h
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/*
* Copyright (C) 2016, STMicroelectronics - All Rights Reserved
* Author(s): Vikas Manocha, <vikas.manocha@st.com> for STMicroelectronics.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef _SERIAL_STM32_
#define _SERIAL_STM32_
#define CR1_OFFSET(x) (x ? 0x0c : 0x00)
#define CR3_OFFSET(x) (x ? 0x14 : 0x08)
#define BRR_OFFSET(x) (x ? 0x08 : 0x0c)
#define ISR_OFFSET(x) (x ? 0x00 : 0x1c)
/*
* STM32F4 has one Data Register (DR) for received or transmitted
* data, so map Receive Data Register (RDR) and Transmit Data
* Register (TDR) at the same offset
*/
#define RDR_OFFSET(x) (x ? 0x04 : 0x24)
#define TDR_OFFSET(x) (x ? 0x04 : 0x28)
struct stm32_uart_info {
u8 uart_enable_bit; /* UART_CR1_UE */
bool stm32f4; /* true for STM32F4, false otherwise */
bool has_overrun_disable;
bool has_fifo;
};
struct stm32_uart_info stm32f4_info = {
.stm32f4 = true,
.uart_enable_bit = 13,
.has_overrun_disable = false,
.has_fifo = false,
};
struct stm32_uart_info stm32f7_info = {
.uart_enable_bit = 0,
.stm32f4 = false,
.has_overrun_disable = true,
.has_fifo = false,
};
struct stm32_uart_info stm32h7_info = {
.uart_enable_bit = 0,
.stm32f4 = false,
.has_overrun_disable = true,
.has_fifo = true,
};
/* Information about a serial port */
struct stm32x7_serial_platdata {
fdt_addr_t base; /* address of registers in physical memory */
struct stm32_uart_info *uart_info;
unsigned long int clock_rate;
};
#define USART_CR1_FIFOEN BIT(29)
#define USART_CR1_OVER8 BIT(15)
#define USART_CR1_TE BIT(3)
#define USART_CR1_RE BIT(2)
#define USART_CR3_OVRDIS BIT(12)
#define USART_SR_FLAG_RXNE BIT(5)
#define USART_SR_FLAG_TXE BIT(7)
#define USART_BRR_F_MASK GENMASK(7, 0)
#define USART_BRR_M_SHIFT 4
#define USART_BRR_M_MASK GENMASK(15, 4)
#endif