2 * serial.c -- KS8695 serial driver
4 * (C) Copyright 2004, Greg Ungerer <greg.ungerer@opengear.com>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 #include <asm/arch/platform.h>
24 #include <linux/compiler.h>
26 #ifndef CONFIG_SERIAL1
27 #error "Bad: you didn't configure serial ..."
30 DECLARE_GLOBAL_DATA_PTR;
33 * Define the UART hardware register access structure.
36 unsigned int RX; /* 0x00 - Receive data (r) */
37 unsigned int TX; /* 0x04 - Transmit data (w) */
38 unsigned int FCR; /* 0x08 - Fifo Control (r/w) */
39 unsigned int LCR; /* 0x0c - Line Control (r/w) */
40 unsigned int MCR; /* 0x10 - Modem Control (r/w) */
41 unsigned int LSR; /* 0x14 - Line Status (r/w) */
42 unsigned int MSR; /* 0x18 - Modem Status (r/w) */
43 unsigned int BD; /* 0x1c - Baud Rate (r/w) */
44 unsigned int SR; /* 0x20 - Status (r/w) */
47 #define KS8695_UART_ADDR ((void *) (KS8695_IO_BASE + KS8695_UART_RX_BUFFER))
48 #define KS8695_UART_CLK 25000000
52 * Under some circumstances we want to be "quiet" and not issue any
53 * serial output - though we want u-boot to otherwise work and behave
54 * the same. By default be noisy.
56 int serial_console = 1;
59 static void ks8695_serial_setbrg(void)
61 volatile struct ks8695uart *uartp = KS8695_UART_ADDR;
63 /* Set to global baud rate and 8 data bits, no parity, 1 stop bit*/
64 uartp->BD = KS8695_UART_CLK / gd->baudrate;
65 uartp->LCR = KS8695_UART_LINEC_WLEN8;
68 static int ks8695_serial_init(void)
75 static void ks8695_serial_raw_putc(const char c)
77 volatile struct ks8695uart *uartp = KS8695_UART_ADDR;
80 for (i = 0; (i < 0x100000); i++) {
81 if (uartp->LSR & KS8695_UART_LINES_TXFE)
88 static void ks8695_serial_putc(const char c)
91 ks8695_serial_raw_putc(c);
93 ks8695_serial_raw_putc('\r');
97 static int ks8695_serial_tstc(void)
99 volatile struct ks8695uart *uartp = KS8695_UART_ADDR;
101 return ((uartp->LSR & KS8695_UART_LINES_RXFE) ? 1 : 0);
105 static void ks8695_serial_puts(const char *s)
108 while ((c = *s++) != 0)
112 static int ks8695_serial_getc(void)
114 volatile struct ks8695uart *uartp = KS8695_UART_ADDR;
116 while ((uartp->LSR & KS8695_UART_LINES_RXFE) == 0)
121 #ifdef CONFIG_SERIAL_MULTI
122 static struct serial_device ks8695_serial_drv = {
123 .name = "ks8695_serial",
124 .start = ks8695_serial_init,
126 .setbrg = ks8695_serial_setbrg,
127 .putc = ks8695_serial_putc,
128 .puts = ks8695_serial_puts,
129 .getc = ks8695_serial_getc,
130 .tstc = ks8695_serial_tstc,
133 void ks8695_serial_initialize(void)
135 serial_register(&ks8695_serial_drv);
138 __weak struct serial_device *default_serial_console(void)
140 return &ks8695_serial_drv;
143 int serial_init(void)
145 return ks8695_serial_init();
148 void serial_setbrg(void)
150 ks8695_serial_setbrg();
153 void serial_putc(const char c)
155 ks8695_serial_putc(c);
158 void serial_puts(const char *s)
160 ks8695_serial_puts(s);
163 int serial_getc(void)
165 return ks8695_serial_getc();
168 int serial_tstc(void)
170 return ks8695_serial_tstc();