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https://github.com/AsahiLinux/u-boot
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b4dbc5d65a
In case there is still chars from previous bootstage to transmit, wait for TC (Transmission Complete) bit to be set which ensure that the last data written in the USART_TDR has been transmitted out of the shift register. Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com> Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
83 lines
2 KiB
C
83 lines
2 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright (C) 2016, STMicroelectronics - All Rights Reserved
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* Author(s): Vikas Manocha, <vikas.manocha@st.com> for STMicroelectronics.
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*/
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#ifndef _SERIAL_STM32_
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#define _SERIAL_STM32_
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#include <linux/bitops.h>
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#define CR1_OFFSET(x) (x ? 0x0c : 0x00)
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#define CR3_OFFSET(x) (x ? 0x14 : 0x08)
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#define BRR_OFFSET(x) (x ? 0x08 : 0x0c)
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#define ISR_OFFSET(x) (x ? 0x00 : 0x1c)
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#define ICR_OFFSET 0x20
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/*
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* STM32F4 has one Data Register (DR) for received or transmitted
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* data, so map Receive Data Register (RDR) and Transmit Data
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* Register (TDR) at the same offset
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*/
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#define RDR_OFFSET(x) (x ? 0x04 : 0x24)
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#define TDR_OFFSET(x) (x ? 0x04 : 0x28)
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struct stm32_uart_info {
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u8 uart_enable_bit; /* UART_CR1_UE */
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bool stm32f4; /* true for STM32F4, false otherwise */
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bool has_fifo;
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};
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struct stm32_uart_info stm32f4_info = {
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.stm32f4 = true,
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.uart_enable_bit = 13,
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.has_fifo = false,
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};
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struct stm32_uart_info stm32f7_info = {
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.uart_enable_bit = 0,
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.stm32f4 = false,
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.has_fifo = true,
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};
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struct stm32_uart_info stm32h7_info = {
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.uart_enable_bit = 0,
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.stm32f4 = false,
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.has_fifo = true,
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};
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/* Information about a serial port */
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struct stm32x7_serial_plat {
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fdt_addr_t base; /* address of registers in physical memory */
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struct stm32_uart_info *uart_info;
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unsigned long int clock_rate;
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};
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#define USART_CR1_FIFOEN BIT(29)
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#define USART_CR1_M1 BIT(28)
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#define USART_CR1_OVER8 BIT(15)
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#define USART_CR1_M0 BIT(12)
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#define USART_CR1_PCE BIT(10)
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#define USART_CR1_PS BIT(9)
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#define USART_CR1_TE BIT(3)
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#define USART_CR1_RE BIT(2)
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#define USART_CR3_OVRDIS BIT(12)
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#define USART_ISR_TXE BIT(7)
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#define USART_ISR_TC BIT(6)
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#define USART_ISR_RXNE BIT(5)
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#define USART_ISR_ORE BIT(3)
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#define USART_ISR_FE BIT(1)
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#define USART_ISR_PE BIT(0)
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#define USART_BRR_F_MASK GENMASK(7, 0)
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#define USART_BRR_M_SHIFT 4
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#define USART_BRR_M_MASK GENMASK(15, 4)
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#define USART_ICR_ORECF BIT(3)
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#define USART_ICR_FECF BIT(1)
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#define USART_ICR_PCECF BIT(0)
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#endif
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