mirror of https://gitee.com/openkylin/linux.git
65 lines
1.3 KiB
C
65 lines
1.3 KiB
C
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/*
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* Xilinx UARTLITE bootloader driver
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*
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* Copyright (C) 2007 Secret Lab Technologies Ltd.
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*
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* This file is licensed under the terms of the GNU General Public License
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* version 2. This program is licensed "as is" without any warranty of any
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* kind, whether express or implied.
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*/
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#include <stdarg.h>
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#include <stddef.h>
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#include "types.h"
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#include "string.h"
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#include "stdio.h"
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#include "io.h"
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#include "ops.h"
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static void * reg_base;
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static int uartlite_open(void)
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{
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/* Clear the RX FIFO */
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out_be32(reg_base + 0x0C, 0x2);
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return 0;
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}
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static void uartlite_putc(unsigned char c)
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{
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while ((in_be32(reg_base + 0x8) & 0x08) != 0); /* spin */
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out_be32(reg_base + 0x4, c);
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}
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static unsigned char uartlite_getc(void)
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{
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while ((in_be32(reg_base + 0x8) & 0x01) == 0); /* spin */
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return in_be32(reg_base);
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}
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static u8 uartlite_tstc(void)
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{
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return ((in_be32(reg_base + 0x8) & 0x01) != 0);
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}
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int uartlite_console_init(void *devp, struct serial_console_data *scdp)
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{
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int n;
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unsigned long reg_phys;
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n = getprop(devp, "virtual-reg", ®_base, sizeof(reg_base));
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if (n != sizeof(reg_base)) {
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if (!dt_xlate_reg(devp, 0, ®_phys, NULL))
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return -1;
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reg_base = (void *)reg_phys;
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}
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scdp->open = uartlite_open;
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scdp->putc = uartlite_putc;
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scdp->getc = uartlite_getc;
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scdp->tstc = uartlite_tstc;
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scdp->close = NULL;
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return 0;
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}
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