mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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72 lines
2.6 KiB
C
72 lines
2.6 KiB
C
/*
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* Copyright (c) 2018 naehrwert
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* Copyright (c) 2018-2019 Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "uart.h"
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#include "timers.h"
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void uart_init(UartDevice dev, uint32_t baud) {
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volatile tegra_uart_t *uart = uart_get_regs(dev);
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/* Set baud rate. */
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uint32_t rate = (8 * baud + 408000000) / (16 * baud);
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uart->UART_LCR = UART_LCR_DLAB; /* Enable DLAB. */
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uart->UART_THR_DLAB = (uint8_t)rate; /* Divisor latch LSB. */
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uart->UART_IER_DLAB = (uint8_t)(rate >> 8); /* Divisor latch MSB. */
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uart->UART_LCR = 0; /* Diable DLAB. */
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/* Setup UART in fifo mode. */
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uart->UART_IER_DLAB = 0;
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uart->UART_IIR_FCR = UART_FCR_FCR_EN_FIFO | UART_FCR_RX_CLR | UART_FCR_TX_CLR; /* Enable and clear TX and RX FIFOs. */
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(void)uart->UART_LSR;
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udelay(3 * ((baud + 999999) / baud));
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uart->UART_LCR = UART_LCR_WD_LENGTH_8; /* Set word length 8. */
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uart->UART_MCR = 0;
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uart->UART_MSR = 0;
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uart->UART_IRDA_CSR = 0;
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uart->UART_RX_FIFO_CFG = 1; /* Set RX_FIFO trigger level */
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uart->UART_MIE = 0;
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uart->UART_ASR = 0;
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}
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/* This function blocks until the UART device (dev) is in the desired state (status). Make sure the desired state can be reached! */
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void uart_wait_idle(UartDevice dev, UartVendorStatus status) {
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while (!(uart_get_regs(dev)->UART_VENDOR_STATUS & status)) {
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/* Wait */
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}
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}
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void uart_send(UartDevice dev, const void *buf, size_t len) {
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volatile tegra_uart_t *uart = uart_get_regs(dev);
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for (size_t i = 0; i < len; i++) {
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while (uart->UART_LSR & UART_LSR_TX_FIFO_FULL) {
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/* Wait until the TX FIFO isn't full */
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}
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uart->UART_THR_DLAB = *((const uint8_t *)buf + i);
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}
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}
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void uart_recv(UartDevice dev, void *buf, size_t len) {
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volatile tegra_uart_t *uart = uart_get_regs(dev);
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for (size_t i = 0; i < len; i++) {
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while (uart->UART_LSR & UART_LSR_RX_FIFO_EMPTY) {
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/* Wait until the RX FIFO isn't empty */
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}
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*((uint8_t *)buf + i) = uart->UART_THR_DLAB;
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}
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}
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