mirror of https://gitee.com/openkylin/linux.git
80 lines
1.7 KiB
C
80 lines
1.7 KiB
C
/*
|
|
* Xilinx UARTLITE bootloader driver
|
|
*
|
|
* Copyright (C) 2007 Secret Lab Technologies Ltd.
|
|
*
|
|
* This file is licensed under the terms of the GNU General Public License
|
|
* version 2. This program is licensed "as is" without any warranty of any
|
|
* kind, whether express or implied.
|
|
*/
|
|
|
|
#include <stdarg.h>
|
|
#include <stddef.h>
|
|
#include "types.h"
|
|
#include "string.h"
|
|
#include "stdio.h"
|
|
#include "io.h"
|
|
#include "ops.h"
|
|
|
|
#define ULITE_RX 0x00
|
|
#define ULITE_TX 0x04
|
|
#define ULITE_STATUS 0x08
|
|
#define ULITE_CONTROL 0x0c
|
|
|
|
#define ULITE_STATUS_RXVALID 0x01
|
|
#define ULITE_STATUS_TXFULL 0x08
|
|
|
|
#define ULITE_CONTROL_RST_RX 0x02
|
|
|
|
static void * reg_base;
|
|
|
|
static int uartlite_open(void)
|
|
{
|
|
/* Clear the RX FIFO */
|
|
out_be32(reg_base + ULITE_CONTROL, ULITE_CONTROL_RST_RX);
|
|
return 0;
|
|
}
|
|
|
|
static void uartlite_putc(unsigned char c)
|
|
{
|
|
u32 reg = ULITE_STATUS_TXFULL;
|
|
while (reg & ULITE_STATUS_TXFULL) /* spin on TXFULL bit */
|
|
reg = in_be32(reg_base + ULITE_STATUS);
|
|
out_be32(reg_base + ULITE_TX, c);
|
|
}
|
|
|
|
static unsigned char uartlite_getc(void)
|
|
{
|
|
u32 reg = ULITE_STATUS_RXVALID;
|
|
while (reg & ULITE_STATUS_RXVALID) /* spin on RXVALID bit */
|
|
reg = in_be32(reg_base + ULITE_STATUS);
|
|
return in_be32(reg_base + ULITE_RX);
|
|
}
|
|
|
|
static u8 uartlite_tstc(void)
|
|
{
|
|
u32 reg = in_be32(reg_base + ULITE_STATUS);
|
|
return reg & ULITE_STATUS_RXVALID;
|
|
}
|
|
|
|
int uartlite_console_init(void *devp, struct serial_console_data *scdp)
|
|
{
|
|
int n;
|
|
unsigned long reg_phys;
|
|
|
|
n = getprop(devp, "virtual-reg", ®_base, sizeof(reg_base));
|
|
if (n != sizeof(reg_base)) {
|
|
if (!dt_xlate_reg(devp, 0, ®_phys, NULL))
|
|
return -1;
|
|
|
|
reg_base = (void *)reg_phys;
|
|
}
|
|
|
|
scdp->open = uartlite_open;
|
|
scdp->putc = uartlite_putc;
|
|
scdp->getc = uartlite_getc;
|
|
scdp->tstc = uartlite_tstc;
|
|
scdp->close = NULL;
|
|
return 0;
|
|
}
|