mirror of
https://github.com/riscv-software-src/opensbi.git
synced 2025-08-25 15:51:41 +01:00
5d025eb235
Using "void *" in arithmetic causes errors with strict compiler settings: "error: pointer of type 'void *' used in arithmetic [-Werror=pointer-arith]" Avoid these by calculating on "char *" where 1-byte data size is assumed. Signed-off-by: Jukka Laitinen <jukkax@ssrc.tii.ae> Reviewed-by: Dong Du <Dd_nirvana@sjtu.edu.cn> Reviewed-by: Xiang W <wxjstz@126.com> Reviewed-by: Anup Patel <anup@brainfault.org>
57 lines
1.2 KiB
C
57 lines
1.2 KiB
C
/*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*
|
|
* Copyright (c) 2020 Vijai Kumar K <vijai@behindbytes.com>
|
|
*/
|
|
|
|
#include <sbi/riscv_io.h>
|
|
#include <sbi/sbi_console.h>
|
|
#include <sbi_utils/serial/shakti-uart.h>
|
|
|
|
#define REG_BAUD 0x00
|
|
#define REG_TX 0x04
|
|
#define REG_RX 0x08
|
|
#define REG_STATUS 0x0C
|
|
#define REG_DELAY 0x10
|
|
#define REG_CONTROL 0x14
|
|
#define REG_INT_EN 0x18
|
|
#define REG_IQ_CYCLES 0x1C
|
|
#define REG_RX_THRES 0x20
|
|
|
|
#define UART_TX_FULL 0x2
|
|
#define UART_RX_FULL 0x8
|
|
|
|
static volatile char *uart_base;
|
|
|
|
static void shakti_uart_putc(char ch)
|
|
{
|
|
while((readw(uart_base + REG_STATUS) & UART_TX_FULL))
|
|
;
|
|
writeb(ch, uart_base + REG_TX);
|
|
}
|
|
|
|
static int shakti_uart_getc(void)
|
|
{
|
|
u16 status = readw(uart_base + REG_STATUS);
|
|
if (status & UART_RX_FULL)
|
|
return readb(uart_base + REG_RX);
|
|
return -1;
|
|
}
|
|
|
|
static struct sbi_console_device shakti_console = {
|
|
.name = "shakti_uart",
|
|
.console_putc = shakti_uart_putc,
|
|
.console_getc = shakti_uart_getc
|
|
};
|
|
|
|
int shakti_uart_init(unsigned long base, u32 in_freq, u32 baudrate)
|
|
{
|
|
uart_base = (volatile char *)base;
|
|
u16 baud = (u16)(in_freq/(16 * baudrate));
|
|
writew(baud, uart_base + REG_BAUD);
|
|
|
|
sbi_console_set_device(&shakti_console);
|
|
|
|
return 0;
|
|
}
|