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Add uart

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This commit is contained in:
MerryMage 2018-02-22 19:27:01 +00:00
parent b00df2032d
commit 71b76c153d
2 changed files with 53 additions and 0 deletions
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33
exosphere/uart.c Normal file
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#include "uart.h"
volatile void *g_uart_registers = NULL;
void set_uart_address(void *uart_base) {
g_uart_registers = uart_base;
}
inline void *get_uart_address(void) {
return g_uart_registers;
}
void uart_initialize(uint16_t divider) {
/* Setup UART in 16450 mode. We assume the relevant UART clock has been enabled. */
/* Disable FIFO */
UART_IIR_FCR_0 = 0x00;
/* Set DLAB */
UART_LCR_0 = 0x80;
UART_THR_DLAB_0_0 = (uint8_t)divider;
UART_IER_DLAB_0_0 = (uint8_t)(divider >> 8);
/* 8N1 mode */
UART_LCR_0 = 0x03;
}
void uart_transmit_char(char ch) {
/* Wait for THR to be empty */
while (!(UART_LSR_0 & 0x20)) {}
UART_THR_DLAB_0_0 = ch;
}

20
exosphere/uart.h Normal file
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#ifndef EXOSPHERE_UART_H
#define EXOSPHERE_UART_H
#include <stdint.h>
/* Exosphere driver for the Tegra X1 UARTs. */
void set_uart_address(void *uart_base);
void *get_uart_address(void); /* This is inlined in uart.c */
#define UART_THR_DLAB_0_0 (*((volatile uint32_t *)(get_uart_address() + 0x0)))
#define UART_IER_DLAB_0_0 (*((volatile uint32_t *)(get_uart_address() + 0x4)))
#define UART_IIR_FCR_0 (*((volatile uint32_t *)(get_uart_address() + 0x8)))
#define UART_LCR_0 (*((volatile uint32_t *)(get_uart_address() + 0xC)))
#define UART_LSR_0 (*((volatile uint32_t *)(get_uart_address() + 0x14)))
void uart_initialize(uint16_t divider);
void uart_transmit_char(char ch);
#endif