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git.ipfire.org Git - people/ms/u-boot.git/blob - drivers/serial/arm_dcc.c
2 * Copyright (C) 2004-2007 ARM Limited.
3 * Copyright (C) 2008 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License version 2
7 * as published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 * As a special exception, if other files instantiate templates or use macros
19 * or inline functions from this file, or you compile this file and link it
20 * with other works to produce a work based on this file, this file does not
21 * by itself cause the resulting work to be covered by the GNU General Public
22 * License. However the source code for this file must still be made available
23 * in accordance with section (3) of the GNU General Public License.
25 * This exception does not invalidate any other reasons why a work based on
26 * this file might be covered by the GNU General Public License.
30 #include <stdio_dev.h>
32 #if defined(CONFIG_CPU_V6)
36 #define DCC_RBIT (1 << 30)
37 #define DCC_WBIT (1 << 29)
39 #define write_dcc(x) \
40 __asm__ volatile ("mcr p14, 0, %0, c0, c5, 0\n" : : "r" (x))
43 __asm__ volatile ("mrc p14, 0, %0, c0, c5, 0\n" : "=r" (x))
45 #define status_dcc(x) \
46 __asm__ volatile ("mrc p14, 0, %0, c0, c1, 0\n" : "=r" (x))
48 #elif defined(CONFIG_CPU_XSCALE)
52 #define DCC_RBIT (1 << 31)
53 #define DCC_WBIT (1 << 28)
55 #define write_dcc(x) \
56 __asm__ volatile ("mcr p14, 0, %0, c8, c0, 0\n" : : "r" (x))
59 __asm__ volatile ("mrc p14, 0, %0, c9, c0, 0\n" : "=r" (x))
61 #define status_dcc(x) \
62 __asm__ volatile ("mrc p14, 0, %0, c14, c0, 0\n" : "=r" (x))
65 #define DCC_RBIT (1 << 0)
66 #define DCC_WBIT (1 << 1)
68 #define write_dcc(x) \
69 __asm__ volatile ("mcr p14, 0, %0, c1, c0, 0\n" : : "r" (x))
72 __asm__ volatile ("mrc p14, 0, %0, c1, c0, 0\n" : "=r" (x))
74 #define status_dcc(x) \
75 __asm__ volatile ("mrc p14, 0, %0, c0, c0, 0\n" : "=r" (x))
79 #define can_read_dcc(x) do { \
84 #define can_write_dcc(x) do { \
90 #define TIMEOUT_COUNT 0x4000000
92 #ifndef CONFIG_ARM_DCC_MULTI
93 #define arm_dcc_init serial_init
94 void serial_setbrg(void) {}
95 #define arm_dcc_getc serial_getc
96 #define arm_dcc_putc serial_putc
97 #define arm_dcc_puts serial_puts
98 #define arm_dcc_tstc serial_tstc
101 int arm_dcc_init(void)
106 int arm_dcc_getc(void)
109 register unsigned int reg
;
119 void arm_dcc_putc(char ch
)
121 register unsigned int reg
;
122 unsigned int timeout_count
= TIMEOUT_COUNT
;
124 while (--timeout_count
) {
129 if (timeout_count
== 0)
135 void arm_dcc_puts(const char *s
)
141 int arm_dcc_tstc(void)
143 register unsigned int reg
;
150 #ifdef CONFIG_ARM_DCC_MULTI
151 static struct stdio_dev arm_dcc_dev
;
153 int drv_arm_dcc_init(void)
157 /* Device initialization */
158 memset(&arm_dcc_dev
, 0, sizeof(arm_dcc_dev
));
160 strcpy(arm_dcc_dev
.name
, "dcc");
161 arm_dcc_dev
.ext
= 0; /* No extensions */
162 arm_dcc_dev
.flags
= DEV_FLAGS_INPUT
| DEV_FLAGS_OUTPUT
;
163 arm_dcc_dev
.tstc
= arm_dcc_tstc
; /* 'tstc' function */
164 arm_dcc_dev
.getc
= arm_dcc_getc
; /* 'getc' function */
165 arm_dcc_dev
.putc
= arm_dcc_putc
; /* 'putc' function */
166 arm_dcc_dev
.puts
= arm_dcc_puts
; /* 'puts' function */
168 return stdio_register(&arm_dcc_dev
);