blob: 46bed69b416938477a0be06e14051cacf8427694 [file] [log] [blame]
Grant Likely7ddc5f92007-10-02 12:15:13 +10001/*
2 * Xilinx UARTLITE bootloader driver
3 *
4 * Copyright (C) 2007 Secret Lab Technologies Ltd.
5 *
6 * This file is licensed under the terms of the GNU General Public License
7 * version 2. This program is licensed "as is" without any warranty of any
8 * kind, whether express or implied.
9 */
10
11#include <stdarg.h>
12#include <stddef.h>
13#include "types.h"
14#include "string.h"
15#include "stdio.h"
16#include "io.h"
17#include "ops.h"
18
Grant Likelybe1b4d342007-10-03 02:44:15 +100019#define ULITE_RX 0x00
20#define ULITE_TX 0x04
21#define ULITE_STATUS 0x08
22#define ULITE_CONTROL 0x0c
23
24#define ULITE_STATUS_RXVALID 0x01
25#define ULITE_STATUS_TXFULL 0x08
26
27#define ULITE_CONTROL_RST_RX 0x02
28
Grant Likely7ddc5f92007-10-02 12:15:13 +100029static void * reg_base;
30
31static int uartlite_open(void)
32{
33 /* Clear the RX FIFO */
Grant Likelybe1b4d342007-10-03 02:44:15 +100034 out_be32(reg_base + ULITE_CONTROL, ULITE_CONTROL_RST_RX);
Grant Likely7ddc5f92007-10-02 12:15:13 +100035 return 0;
36}
37
38static void uartlite_putc(unsigned char c)
39{
Grant Likelybe1b4d342007-10-03 02:44:15 +100040 u32 reg = ULITE_STATUS_TXFULL;
41 while (reg & ULITE_STATUS_TXFULL) /* spin on TXFULL bit */
42 reg = in_be32(reg_base + ULITE_STATUS);
43 out_be32(reg_base + ULITE_TX, c);
Grant Likely7ddc5f92007-10-02 12:15:13 +100044}
45
46static unsigned char uartlite_getc(void)
47{
Grant Likely17c5c202007-10-04 15:44:54 -060048 u32 reg = 0;
49 while (!(reg & ULITE_STATUS_RXVALID)) /* spin waiting for RXVALID bit */
Grant Likelybe1b4d342007-10-03 02:44:15 +100050 reg = in_be32(reg_base + ULITE_STATUS);
51 return in_be32(reg_base + ULITE_RX);
Grant Likely7ddc5f92007-10-02 12:15:13 +100052}
53
54static u8 uartlite_tstc(void)
55{
Grant Likelybe1b4d342007-10-03 02:44:15 +100056 u32 reg = in_be32(reg_base + ULITE_STATUS);
57 return reg & ULITE_STATUS_RXVALID;
Grant Likely7ddc5f92007-10-02 12:15:13 +100058}
59
60int uartlite_console_init(void *devp, struct serial_console_data *scdp)
61{
62 int n;
63 unsigned long reg_phys;
64
65 n = getprop(devp, "virtual-reg", &reg_base, sizeof(reg_base));
66 if (n != sizeof(reg_base)) {
67 if (!dt_xlate_reg(devp, 0, &reg_phys, NULL))
68 return -1;
69
70 reg_base = (void *)reg_phys;
71 }
72
73 scdp->open = uartlite_open;
74 scdp->putc = uartlite_putc;
75 scdp->getc = uartlite_getc;
76 scdp->tstc = uartlite_tstc;
77 scdp->close = NULL;
78 return 0;
79}