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
|
/*
* (C) Copyright 2004, Freescale, Inc
* TsiChung Liew, Tsi-Chung.Liew@freescale.com.
*
* 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, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
*/
/*
* Minimal serial functions needed to use one of the PSC ports
* as serial console interface.
*/
#include <common.h>
#include <mpc8220.h>
#include <serial.h>
#include <linux/compiler.h>
DECLARE_GLOBAL_DATA_PTR;
#define PSC_BASE MMAP_PSC1
#if defined(CONFIG_PSC_CONSOLE)
static int mpc8220_serial_init(void)
{
volatile psc8220_t *psc = (psc8220_t *) PSC_BASE;
u32 counter;
/* write to SICR: SIM2 = uart mode,dcd does not affect rx */
psc->cr = 0;
psc->ipcr_acr = 0;
psc->isr_imr = 0;
/* write to CSR: RX/TX baud rate from timers */
psc->sr_csr = 0xdd000000;
psc->mr1_2 = PSC_MR1_BITS_CHAR_8 | PSC_MR1_NO_PARITY | PSC_MR2_STOP_BITS_1;
/* Setting up BaudRate */
counter = ((gd->bus_clk / gd->baudrate)) >> 5;
counter++;
/* write to CTUR: divide counter upper byte */
psc->ctur = ((counter & 0xff00) << 16);
/* write to CTLR: divide counter lower byte */
psc->ctlr = ((counter & 0x00ff) << 24);
psc->cr = PSC_CR_RST_RX_CMD;
psc->cr = PSC_CR_RST_TX_CMD;
psc->cr = PSC_CR_RST_ERR_STS_CMD;
psc->cr = PSC_CR_RST_BRK_INT_CMD;
psc->cr = PSC_CR_RST_MR_PTR_CMD;
psc->cr = PSC_CR_RX_ENABLE | PSC_CR_TX_ENABLE;
return (0);
}
static void mpc8220_serial_putc(const char c)
{
volatile psc8220_t *psc = (psc8220_t *) PSC_BASE;
if (c == '\n')
serial_putc ('\r');
/* Wait for last character to go. */
while (!(psc->sr_csr & PSC_SR_TXRDY));
psc->xmitbuf[0] = c;
}
static int mpc8220_serial_getc(void)
{
volatile psc8220_t *psc = (psc8220_t *) PSC_BASE;
/* Wait for a character to arrive. */
while (!(psc->sr_csr & PSC_SR_RXRDY));
return psc->xmitbuf[2];
}
static int mpc8220_serial_tstc(void)
{
volatile psc8220_t *psc = (psc8220_t *) PSC_BASE;
return (psc->sr_csr & PSC_SR_RXRDY);
}
static void mpc8220_serial_setbrg(void)
{
volatile psc8220_t *psc = (psc8220_t *) PSC_BASE;
u32 counter;
counter = ((gd->bus_clk / gd->baudrate)) >> 5;
counter++;
/* write to CTUR: divide counter upper byte */
psc->ctur = ((counter & 0xff00) << 16);
/* write to CTLR: divide counter lower byte */
psc->ctlr = ((counter & 0x00ff) << 24);
psc->cr = PSC_CR_RST_RX_CMD;
psc->cr = PSC_CR_RST_TX_CMD;
psc->cr = PSC_CR_RX_ENABLE | PSC_CR_TX_ENABLE;
}
static struct serial_device mpc8220_serial_drv = {
.name = "mpc8220_serial",
.start = mpc8220_serial_init,
.stop = NULL,
.setbrg = mpc8220_serial_setbrg,
.putc = mpc8220_serial_putc,
.puts = default_serial_puts,
.getc = mpc8220_serial_getc,
.tstc = mpc8220_serial_tstc,
};
void mpc8220_serial_initialize(void)
{
serial_register(&mpc8220_serial_drv);
}
__weak struct serial_device *default_serial_console(void)
{
return &mpc8220_serial_drv;
}
#endif /* CONFIG_PSC_CONSOLE */
|
