| /* |
| * Copyright (c) 2016-2017, ARM Limited and Contributors. All rights reserved. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| #include <arch.h> |
| #include <asm_macros.S> |
| #include <assert_macros.S> |
| #include <console_macros.S> |
| #include <drivers/cadence/cdns_uart.h> |
| |
| /* |
| * "core" functions are low-level implementations that don't require |
| * writable memory and are thus safe to call in BL1 crash context. |
| */ |
| .globl console_cdns_core_init |
| .globl console_cdns_core_putc |
| .globl console_cdns_core_getc |
| .globl console_cdns_core_flush |
| |
| .globl console_cdns_putc |
| .globl console_cdns_getc |
| .globl console_cdns_flush |
| |
| /* ----------------------------------------------- |
| * int console_cdns_core_init(uintptr_t base_addr) |
| * Function to initialize the console without a |
| * C Runtime to print debug information. This |
| * function will be accessed by console_init and |
| * crash reporting. |
| * We assume that the bootloader already set up |
| * the HW (baud, ...) and only enable the trans- |
| * mitter and receiver here. |
| * In: x0 - console base address |
| * Out: return 1 on success else 0 on error |
| * Clobber list : x1, x2, x3 |
| * ----------------------------------------------- |
| */ |
| func console_cdns_core_init |
| /* Check the input base address */ |
| cbz x0, core_init_fail |
| |
| /* RX/TX enabled & reset */ |
| mov w3, #(R_UART_CR_TX_EN | R_UART_CR_RX_EN | R_UART_CR_TXRST | R_UART_CR_RXRST) |
| str w3, [x0, #R_UART_CR] |
| |
| mov w0, #1 |
| ret |
| core_init_fail: |
| mov w0, wzr |
| ret |
| endfunc console_cdns_core_init |
| |
| .globl console_cdns_register |
| |
| /* ----------------------------------------------- |
| * int console_cdns_register(uintptr_t baseaddr, |
| * uint32_t clock, uint32_t baud, |
| * console_cdns_t *console); |
| * Function to initialize and register a new CDNS |
| * console. Storage passed in for the console struct |
| * *must* be persistent (i.e. not from the stack). |
| * In: x0 - UART register base address |
| * w1 - UART clock in Hz |
| * w2 - Baud rate |
| * x3 - pointer to empty console_16550_t struct |
| * Out: return 1 on success, 0 on error |
| * Clobber list : x0, x1, x2, x6, x7, x14 |
| * ----------------------------------------------- |
| */ |
| func console_cdns_register |
| mov x7, x30 |
| mov x6, x3 |
| cbz x6, register_fail |
| str x0, [x6, #CONSOLE_T_CDNS_BASE] |
| |
| bl console_cdns_core_init |
| cbz x0, register_fail |
| |
| mov x0, x6 |
| mov x30, x7 |
| finish_console_register cdns putc=1, getc=1, flush=1 |
| |
| register_fail: |
| ret x7 |
| endfunc console_cdns_register |
| |
| /* -------------------------------------------------------- |
| * int console_cdns_core_putc(int c, uintptr_t base_addr) |
| * Function to output a character over the console. It |
| * returns the character printed on success or -1 on error. |
| * In : w0 - character to be printed |
| * x1 - console base address |
| * Out : return -1 on error else return character. |
| * Clobber list : x2 |
| * -------------------------------------------------------- |
| */ |
| func console_cdns_core_putc |
| #if ENABLE_ASSERTIONS |
| cmp x1, #0 |
| ASM_ASSERT(ne) |
| #endif /* ENABLE_ASSERTIONS */ |
| |
| /* Prepend '\r' to '\n' */ |
| cmp w0, #0xA |
| b.ne 2f |
| 1: |
| /* Check if the transmit FIFO is full */ |
| ldr w2, [x1, #R_UART_SR] |
| tbnz w2, #UART_SR_INTR_TFUL_BIT, 1b |
| mov w2, #0xD |
| str w2, [x1, #R_UART_TX] |
| 2: |
| /* Check if the transmit FIFO is full */ |
| ldr w2, [x1, #R_UART_SR] |
| tbnz w2, #UART_SR_INTR_TFUL_BIT, 2b |
| str w0, [x1, #R_UART_TX] |
| ret |
| endfunc console_cdns_core_putc |
| |
| /* -------------------------------------------------------- |
| * int console_cdns_putc(int c, console_cdns_t *cdns) |
| * Function to output a character over the console. It |
| * returns the character printed on success or -1 on error. |
| * In : w0 - character to be printed |
| * x1 - pointer to console_t structure |
| * Out : return -1 on error else return character. |
| * Clobber list : x2 |
| * -------------------------------------------------------- |
| */ |
| func console_cdns_putc |
| #if ENABLE_ASSERTIONS |
| cmp x1, #0 |
| ASM_ASSERT(ne) |
| #endif /* ENABLE_ASSERTIONS */ |
| ldr x1, [x1, #CONSOLE_T_CDNS_BASE] |
| b console_cdns_core_putc |
| endfunc console_cdns_putc |
| |
| /* --------------------------------------------- |
| * int console_cdns_core_getc(uintptr_t base_addr) |
| * Function to get a character from the console. |
| * It returns the character grabbed on success |
| * or -1 if no character is available. |
| * In : x0 - console base address |
| * Out: w0 - character if available, else -1 |
| * Clobber list : x0, x1 |
| * --------------------------------------------- |
| */ |
| func console_cdns_core_getc |
| #if ENABLE_ASSERTIONS |
| cmp x0, #0 |
| ASM_ASSERT(ne) |
| #endif /* ENABLE_ASSERTIONS */ |
| |
| /* Check if the receive FIFO is empty */ |
| ldr w1, [x0, #R_UART_SR] |
| tbnz w1, #UART_SR_INTR_REMPTY_BIT, no_char |
| ldr w1, [x0, #R_UART_RX] |
| mov w0, w1 |
| ret |
| no_char: |
| mov w0, #ERROR_NO_PENDING_CHAR |
| ret |
| endfunc console_cdns_core_getc |
| |
| /* --------------------------------------------- |
| * int console_cdns_getc(console_cdns_t *console) |
| * Function to get a character from the console. |
| * It returns the character grabbed on success |
| * or -1 if no character is available. |
| * In : x0 - pointer to console_t structure |
| * Out: w0 - character if available, else -1 |
| * Clobber list : x0, x1 |
| * --------------------------------------------- |
| */ |
| func console_cdns_getc |
| #if ENABLE_ASSERTIONS |
| cmp x0, #0 |
| ASM_ASSERT(ne) |
| #endif /* ENABLE_ASSERTIONS */ |
| ldr x0, [x0, #CONSOLE_T_CDNS_BASE] |
| b console_cdns_core_getc |
| endfunc console_cdns_getc |
| |
| /* --------------------------------------------- |
| * int console_cdns_core_flush(uintptr_t base_addr) |
| * Function to force a write of all buffered |
| * data that hasn't been output. |
| * In : x0 - console base address |
| * Out : return -1 on error else return 0. |
| * Clobber list : x0, x1 |
| * --------------------------------------------- |
| */ |
| func console_cdns_core_flush |
| #if ENABLE_ASSERTIONS |
| cmp x0, #0 |
| ASM_ASSERT(ne) |
| #endif /* ENABLE_ASSERTIONS */ |
| /* Placeholder */ |
| mov w0, #0 |
| ret |
| endfunc console_cdns_core_flush |
| |
| /* --------------------------------------------- |
| * int console_cdns_flush(console_pl011_t *console) |
| * Function to force a write of all buffered |
| * data that hasn't been output. |
| * In : x0 - pointer to console_t structure |
| * Out : return -1 on error else return 0. |
| * Clobber list : x0, x1 |
| * --------------------------------------------- |
| */ |
| func console_cdns_flush |
| #if ENABLE_ASSERTIONS |
| cmp x0, #0 |
| ASM_ASSERT(ne) |
| #endif /* ENABLE_ASSERTIONS */ |
| ldr x0, [x0, #CONSOLE_T_CDNS_BASE] |
| b console_cdns_core_flush |
| endfunc console_cdns_flush |
