80 lines
1.7 KiB
C
80 lines
1.7 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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#define ULITE_RX 0x00
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#define ULITE_TX 0x04
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#define ULITE_STATUS 0x08
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#define ULITE_CONTROL 0x0c
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#define ULITE_STATUS_RXVALID 0x01
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#define ULITE_STATUS_TXFULL 0x08
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#define ULITE_CONTROL_RST_RX 0x02
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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 + ULITE_CONTROL, ULITE_CONTROL_RST_RX);
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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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u32 reg = ULITE_STATUS_TXFULL;
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while (reg & ULITE_STATUS_TXFULL) /* spin on TXFULL bit */
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reg = in_be32(reg_base + ULITE_STATUS);
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out_be32(reg_base + ULITE_TX, c);
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}
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static unsigned char uartlite_getc(void)
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{
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u32 reg = 0;
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while (!(reg & ULITE_STATUS_RXVALID)) /* spin waiting for RXVALID bit */
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reg = in_be32(reg_base + ULITE_STATUS);
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return in_be32(reg_base + ULITE_RX);
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}
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static u8 uartlite_tstc(void)
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{
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u32 reg = in_be32(reg_base + ULITE_STATUS);
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return reg & ULITE_STATUS_RXVALID;
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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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