| /* |
| * Copyright (c) 2017-2018, ARM Limited and Contributors. All rights reserved. |
| * Copyright (c) 2018,2020 The Linux Foundation. All rights reserved. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| |
| #include <asm_macros.S> |
| #include <console_macros.S> |
| |
| #include <platform_def.h> |
| #include <qti_uart_console.h> |
| |
| /* |
| * This driver implements console logging into a ring buffer. |
| */ |
| |
| .globl qti_console_uart_register |
| |
| /* ----------------------------------------------- |
| * int qti_console_uart_register(console_t *console, |
| * uintptr_t uart_base_addr) |
| * Registers uart console instance. |
| * In: x0 - pointer to empty console_t struct |
| * x1 - start address of uart block. |
| * Out: x0 - 1 to indicate success |
| * Clobber list: x0, x1, x14 |
| * ----------------------------------------------- |
| */ |
| func qti_console_uart_register |
| str x1, [x0, #CONSOLE_T_BASE] /* Save UART base. */ |
| finish_console_register uart putc=1, flush=1 |
| endfunc qti_console_uart_register |
| |
| /* ----------------------------------------------- |
| * int qti_console_uart_puts(int c, console_t *console) |
| * Writes a character to the UART console. |
| * The character must be preserved in x0. |
| * In: x0 - character to be stored |
| * x1 - pointer to console_t struct |
| * Clobber list: x1, x2 |
| * ----------------------------------------------- |
| */ |
| func console_uart_putc |
| /* set x1 = UART base. */ |
| ldr x1, [x1, #CONSOLE_T_BASE] |
| |
| /* Loop until M_GENI_CMD_ACTIVE bit not clear. */ |
| 1: ldr w2, [x1, #GENI_STATUS_REG] |
| and w2, w2, #GENI_STATUS_M_GENI_CMD_ACTIVE_MASK |
| cmp w2, #GENI_STATUS_M_GENI_CMD_ACTIVE_MASK |
| b.eq 1b |
| |
| /* Transmit data. */ |
| cmp w0, #0xA |
| b.ne 3f |
| |
| /* Add '\r' when input char is '\n' */ |
| mov w2, #0x1 |
| mov w0, #0xD |
| str w2, [x1, #UART_TX_TRANS_LEN_REG] |
| mov w2, #GENI_M_CMD_TX |
| str w2, [x1, #GENI_M_CMD0_REG] |
| str w0, [x1, #GENI_TX_FIFOn_REG] |
| mov w0, #0xA |
| |
| /* Loop until M_GENI_CMD_ACTIVE bit not clear. */ |
| 2: ldr w2, [x1, #GENI_STATUS_REG] |
| and w2, w2, #GENI_STATUS_M_GENI_CMD_ACTIVE_MASK |
| cmp w2, #GENI_STATUS_M_GENI_CMD_ACTIVE_MASK |
| b.eq 2b |
| |
| /* Transmit i/p data. */ |
| 3: mov w2, #0x1 |
| str w2, [x1, #UART_TX_TRANS_LEN_REG] |
| mov w2, #GENI_M_CMD_TX |
| str w2, [x1, #GENI_M_CMD0_REG] |
| str w0, [x1, #GENI_TX_FIFOn_REG] |
| |
| ret |
| endfunc console_uart_putc |
| |
| /* ----------------------------------------------- |
| * int qti_console_uart_flush(console_t *console) |
| * In: x0 - pointer to console_t struct |
| * Out: x0 - 0 for success |
| * Clobber list: x0, x1 |
| * ----------------------------------------------- |
| */ |
| func console_uart_flush |
| /* set x0 = UART base. */ |
| ldr x0, [x0, #CONSOLE_T_BASE] |
| |
| /* Loop until M_GENI_CMD_ACTIVE bit not clear. */ |
| 1: ldr w1, [x0, #GENI_STATUS_REG] |
| and w1, w1, #GENI_STATUS_M_GENI_CMD_ACTIVE_MASK |
| cmp w1, #GENI_STATUS_M_GENI_CMD_ACTIVE_MASK |
| b.eq 1b |
| |
| mov w0, #0 |
| ret |
| endfunc console_uart_flush |
