https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 7d194c2100ad2a6dded545887d02754948ca5241 authored by Linus Torvalds on 20 October 2019, 19:56:22 UTC
Linux 5.4-rc4
Linux 5.4-rc4
Tip revision: 7d194c2
stm32.S
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) STMicroelectronics SA 2017 - All Rights Reserved
* Author: Gerald Baeza <gerald.baeza@st.com> for STMicroelectronics.
*/
#define STM32_UART_BASE 0x40011000 /* USART1 */
#ifdef CONFIG_STM32F4_DEBUG_UART
#define STM32_USART_SR_OFF 0x00
#define STM32_USART_TDR_OFF 0x04
#endif
#ifdef CONFIG_STM32F7_DEBUG_UART
#define STM32_USART_SR_OFF 0x1C
#define STM32_USART_TDR_OFF 0x28
#endif
#define STM32_USART_TC (1 << 6) /* Tx complete */
#define STM32_USART_TXE (1 << 7) /* Tx data reg empty */
.macro addruart, rp, rv, tmp
ldr \rp, =STM32_UART_BASE @ physical base
ldr \rv, =STM32_UART_BASE @ virt base /* NoMMU */
.endm
.macro senduart,rd,rx
strb \rd, [\rx, #STM32_USART_TDR_OFF]
.endm
.macro waituart,rd,rx
1001: ldr \rd, [\rx, #(STM32_USART_SR_OFF)] @ Read Status Register
tst \rd, #STM32_USART_TXE @ TXE = 1 = tx empty
beq 1001b
.endm
.macro busyuart,rd,rx
1001: ldr \rd, [\rx, #(STM32_USART_SR_OFF)] @ Read Status Register
tst \rd, #STM32_USART_TC @ TC = 1 = tx complete
beq 1001b
.endm