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| author | Wesley W. Terpstra <wesley@sifive.com> | 2017-03-27 12:13:53 -0700 |
|---|---|---|
| committer | Wesley W. Terpstra <wesley@sifive.com> | 2017-03-27 15:50:22 -0700 |
| commit | 9fa7b30887301f149f2497469a442d0887b21149 (patch) | |
| tree | 33b67126a0fb86de8603aa8cae2496f2342f45d0 /machine/uart.h | |
| parent | 3473915b3a3fd925a68fc3260c64824cab2846d2 (diff) | |
| download | pk-9fa7b30887301f149f2497469a442d0887b21149.zip pk-9fa7b30887301f149f2497469a442d0887b21149.tar.gz pk-9fa7b30887301f149f2497469a442d0887b21149.tar.bz2 | |
uart: add physical device driver
Diffstat (limited to 'machine/uart.h')
| -rw-r--r-- | machine/uart.h | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/machine/uart.h b/machine/uart.h new file mode 100644 index 0000000..51e951f --- /dev/null +++ b/machine/uart.h @@ -0,0 +1,21 @@ +#ifndef _RISCV_UART_H +#define _RISCV_UART_H + +#include <stdint.h> + +extern volatile uint32_t* uart; + +#define UART_REG_TXFIFO 0 +#define UART_REG_RXFIFO 1 +#define UART_REG_TXCTRL 2 +#define UART_REG_RXCTRL 3 +#define UART_REG_DIV 4 + +#define UART_TXEN 0x1 +#define UART_RXEN 0x1 + +void uart_putchar(uint8_t ch); +int uart_getchar(); +void query_uart(uintptr_t dtb); + +#endif |