Support for NXP's imx SoC debug uart
Add NXP's imx SoC debug uart driver. Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
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/*
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* Copyright (c) 2015-2018, ARM Limited and Contributors. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#ifndef __IMX_LPUART_H__
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#define __IMX_LPUART_H__
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#include <console.h>
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#define VERID 0x0
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#define PARAM 0x4
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#define GLOBAL 0x8
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#define PINCFG 0xC
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#define BAUD 0x10
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#define STAT 0x14
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#define CTRL 0x18
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#define DATA 0x1C
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#define MATCH 0x20
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#define MODIR 0x24
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#define FIFO 0x28
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#define WATER 0x2c
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#define US1_TDRE (1 << 23)
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#define US1_RDRF (1 << 21)
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#define CTRL_TE (1 << 19)
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#define CTRL_RE (1 << 18)
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#define FIFO_TXFE 0x80
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#define FIFO_RXFE 0x40
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#define WATER_TXWATER_OFF 1
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#define WATER_RXWATER_OFF 16
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#define LPUART_CTRL_PT_MASK 0x1
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#define LPUART_CTRL_PE_MASK 0x2
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#define LPUART_CTRL_M_MASK 0x10
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#define LPUART_BAUD_OSR_MASK (0x1F000000U)
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#define LPUART_BAUD_OSR_SHIFT (24U)
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#define LPUART_BAUD_OSR(x) (((uint32_t)(((uint32_t)(x)) << LPUART_BAUD_OSR_SHIFT)) & LPUART_BAUD_OSR_MASK)
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#define LPUART_BAUD_SBR_MASK (0x1FFFU)
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#define LPUART_BAUD_SBR_SHIFT (0U)
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#define LPUART_BAUD_SBR(x) (((uint32_t)(((uint32_t)(x)) << LPUART_BAUD_SBR_SHIFT)) & LPUART_BAUD_SBR_MASK)
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#define LPUART_BAUD_SBNS_MASK (0x2000U)
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#define LPUART_BAUD_BOTHEDGE_MASK (0x20000U)
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#define LPUART_BAUD_M10_MASK (0x20000000U)
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#ifndef __ASSEMBLY__
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#include <types.h>
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typedef struct {
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console_t console;
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uintptr_t base;
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} console_lpuart_t;
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int console_lpuart_register(uintptr_t baseaddr, uint32_t clock, uint32_t baud,
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console_lpuart_t *console);
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#endif /*__ASSEMBLY__*/
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#endif /* __IMX_LPUART_H__*/
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/*
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* Copyright (c) 2015-2018, ARM Limited and Contributors. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <arch.h>
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#include <asm_macros.S>
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#include <console_macros.S>
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#include <assert_macros.S>
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#include "imx8_lpuart.h"
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.globl console_lpuart_register
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.globl console_lpuart_init
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.globl console_lpuart_putc
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.globl console_lpuart_getc
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func console_lpuart_register
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mov x7, x30
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mov x6, x3
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cbz x6, register_fail
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str x0, [x6, #CONSOLE_T_DRVDATA]
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bl console_lpuart_init
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cbz x0, register_fail
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mov x0, x6
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mov x30, x7
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finish_console_register lpuart
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register_fail:
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ret x7
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endfunc console_lpuart_register
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func console_lpuart_init
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mov w0, #1
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ret
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endfunc console_lpuart_init
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func console_lpuart_putc
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ldr x1, [x1, #CONSOLE_T_DRVDATA]
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cbz x1, putc_error
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/* Prepare '\r' to '\n' */
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cmp w0, #0xA
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b.ne 2f
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1:
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/* Check if the transmit FIFO is full */
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ldr w2, [x1, #STAT]
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tbz w2, #23, 1b
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mov w2, #0xD
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str w2, [x1, #DATA]
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2:
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/* Check if the transmit FIFO is full */
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ldr w2, [x1, #STAT]
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tbz w2, #23, 2b
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str w0, [x1, #DATA]
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ret
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putc_error:
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mov w0, #-1
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ret
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endfunc console_lpuart_putc
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func console_lpuart_getc
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ldr x0, [x0, #CONSOLE_T_DRVDATA]
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cbz x0, getc_error
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/* Check if the receive FIFO state */
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ret
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getc_error:
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mov w0, #-1
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ret
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endfunc console_lpuart_getc
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