summaryrefslogtreecommitdiff
path: root/arch/powerpc/cpu/mpc5xx/serial.c
blob: 732856a5c57106ddc6e2e4e09b6e41680bbffa56 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
/*
 * (C) Copyright 2003
 * Martin Winistoerfer, martinwinistoerfer@gmx.ch.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation,
 */

/*
 * File:		serial.c
 *
 * Discription:		Serial interface driver for SCI1 and SCI2.
 *			Since this code will be called from ROM use
 *			only non-static local variables.
 *
 */

#include <common.h>
#include <watchdog.h>
#include <command.h>
#include <mpc5xx.h>
#include <serial.h>
#include <linux/compiler.h>

DECLARE_GLOBAL_DATA_PTR;

/*
 * Local functions
 */

static int ready_to_send(void)
{
	volatile immap_t *immr = (immap_t *)CONFIG_SYS_IMMR;
	volatile short status;

	do {
#if defined(CONFIG_5xx_CONS_SCI1)
		status = immr->im_qsmcm.qsmcm_sc1sr;
#else
		status = immr->im_qsmcm.qsmcm_sc2sr;
#endif

#if defined(CONFIG_WATCHDOG)
		reset_5xx_watchdog (immr);
#endif
	} while ((status & SCI_TDRE) == 0);
	return 1;

}

/*
 * Minimal global serial functions needed to use one of the SCI modules.
 */

static int mpc5xx_serial_init(void)
{
	volatile immap_t *immr = (immap_t *)CONFIG_SYS_IMMR;

	serial_setbrg();

#if defined(CONFIG_5xx_CONS_SCI1)
	/* 10-Bit, 1 start bit, 8 data bit, no parity, 1 stop bit */
	immr->im_qsmcm.qsmcm_scc1r1 = SCI_M_10;
	immr->im_qsmcm.qsmcm_scc1r1 = SCI_TE | SCI_RE;
#else
	immr->im_qsmcm.qsmcm_scc2r1 = SCI_M_10;
	immr->im_qsmcm.qsmcm_scc2r1 = SCI_TE | SCI_RE;
#endif
	return 0;
}

static void mpc5xx_serial_putc(const char c)
{
	volatile immap_t *immr = (immap_t *)CONFIG_SYS_IMMR;

	/* Test for completition */
	if(ready_to_send()) {
#if defined(CONFIG_5xx_CONS_SCI1)
		immr->im_qsmcm.qsmcm_sc1dr = (short)c;
#else
		immr->im_qsmcm.qsmcm_sc2dr = (short)c;
#endif
		if(c == '\n') {
			if(ready_to_send());
#if defined(CONFIG_5xx_CONS_SCI1)
			immr->im_qsmcm.qsmcm_sc1dr = (short)'\r';
#else
			immr->im_qsmcm.qsmcm_sc2dr = (short)'\r';
#endif
		}
	}
}

static int mpc5xx_serial_getc(void)
{
	volatile immap_t *immr = (immap_t *)CONFIG_SYS_IMMR;
	volatile short status;
	unsigned char tmp;

	/* New data ? */
	do {
#if defined(CONFIG_5xx_CONS_SCI1)
		status = immr->im_qsmcm.qsmcm_sc1sr;
#else
		status = immr->im_qsmcm.qsmcm_sc2sr;
#endif

#if defined(CONFIG_WATCHDOG)
		reset_5xx_watchdog (immr);
#endif
	} while ((status & SCI_RDRF) == 0);

	/* Read data */
#if defined(CONFIG_5xx_CONS_SCI1)
	tmp = (unsigned char)(immr->im_qsmcm.qsmcm_sc1dr & SCI_SCXDR_MK);
#else
	tmp = (unsigned char)( immr->im_qsmcm.qsmcm_sc2dr & SCI_SCXDR_MK);
#endif
	return	tmp;
}

static int mpc5xx_serial_tstc(void)
{
	volatile immap_t *immr = (immap_t *)CONFIG_SYS_IMMR;
	short status;

	/* New data character ? */
#if defined(CONFIG_5xx_CONS_SCI1)
	status = immr->im_qsmcm.qsmcm_sc1sr;
#else
	status = immr->im_qsmcm.qsmcm_sc2sr;
#endif
	return (status & SCI_RDRF);
}

static void mpc5xx_serial_setbrg(void)
{
	volatile immap_t *immr = (immap_t *)CONFIG_SYS_IMMR;
	short scxbr;

	/* Set baudrate */
	scxbr = (gd->cpu_clk / (32 * gd->baudrate));
#if defined(CONFIG_5xx_CONS_SCI1)
	immr->im_qsmcm.qsmcm_scc1r0 = (scxbr & SCI_SCXBR_MK);
#else
	immr->im_qsmcm.qsmcm_scc2r0 = (scxbr & SCI_SCXBR_MK);
#endif
}

static struct serial_device mpc5xx_serial_drv = {
	.name	= "mpc5xx_serial",
	.start	= mpc5xx_serial_init,
	.stop	= NULL,
	.setbrg	= mpc5xx_serial_setbrg,
	.putc	= mpc5xx_serial_putc,
	.puts	= default_serial_puts,
	.getc	= mpc5xx_serial_getc,
	.tstc	= mpc5xx_serial_tstc,
};

void mpc5xx_serial_initialize(void)
{
	serial_register(&mpc5xx_serial_drv);
}

__weak struct serial_device *default_serial_console(void)
{
	return &mpc5xx_serial_drv;
}