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wdenk945af8d2003-07-16 21:53:01 +00001/*
2 * (C) Copyright 2000 - 2003
3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4 *
5 * See file CREDITS for list of people who contributed to this
6 * project.
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21 * MA 02111-1307 USA
22 *
23 * Hacked for MPC8260 by Murray.Jensen@cmst.csiro.au, 19-Oct-00, with
24 * changes based on the file arch/ppc/mbxboot/m8260_tty.c from the
25 * Linux/PPC sources (m8260_tty.c had no copyright info in it).
26 */
27
28/*
29 * Minimal serial functions needed to use one of the PSC ports
30 * as serial console interface.
31 */
32
33#include <common.h>
34#include <mpc5xxx.h>
35
36#if defined(CONFIG_PSC_CONSOLE)
37
38#if CONFIG_PSC_CONSOLE == 1
39#define PSC_BASE MPC5XXX_PSC1
40#elif CONFIG_PSC_CONSOLE == 2
41#define PSC_BASE MPC5XXX_PSC2
42#elif CONFIG_PSC_CONSOLE == 3
43#define PSC_BASE MPC5XXX_PSC3
44#elif defined(CONFIG_MGT5100)
45#error CONFIG_PSC_CONSOLE must be in 1, 2 or 3
46#elif CONFIG_PSC_CONSOLE == 4
47#define PSC_BASE MPC5XXX_PSC4
48#elif CONFIG_PSC_CONSOLE == 5
49#define PSC_BASE MPC5XXX_PSC5
50#elif CONFIG_PSC_CONSOLE == 6
51#define PSC_BASE MPC5XXX_PSC6
52#else
53#error CONFIG_PSC_CONSOLE must be in 1 ... 6
54#endif
55
56int serial_init (void)
57{
58 DECLARE_GLOBAL_DATA_PTR;
59
60 volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)PSC_BASE;
61 unsigned long baseclk;
62 int div;
63
64 /* reset PSC */
65 psc->command = PSC_SEL_MODE_REG_1;
66
67 /* select clock sources */
68#if defined(CONFIG_MGT5100)
69 psc->psc_clock_select = 0xdd00;
70 baseclk = CFG_MPC5XXX_CLKIN / 32;
71#elif defined(CONFIG_MPC5200)
72 psc->psc_clock_select = 0;
73 baseclk = gd->ipb_clk / 32;
74#endif
75
76 /* switch to UART mode */
77 psc->sicr = 0;
78
79 /* configure parity, bit length and so on */
80#if defined(CONFIG_MGT5100)
81 psc->mode = PSC_MODE_ERR | PSC_MODE_8_BITS | PSC_MODE_PARNONE;
82#elif defined(CONFIG_MPC5200)
83 psc->mode = PSC_MODE_8_BITS | PSC_MODE_PARNONE;
84#endif
85 psc->mode = PSC_MODE_ONE_STOP;
86
87 /* set up UART divisor */
88 div = baseclk / gd->baudrate;
89 psc->ctur = div >> 8;
90 psc->ctlr = div & 0xff;
91
92 /* disable all interrupts */
93 psc->psc_imr = 0;
94
95 /* reset and enable Rx/Tx */
96 psc->command = PSC_RST_RX;
97 psc->command = PSC_RST_TX;
98 psc->command = PSC_RX_ENABLE | PSC_TX_ENABLE;
99
100 return (0);
101}
102
103void
104serial_putc(const char c)
105{
106 volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)PSC_BASE;
107
108 if (c == '\n')
109 serial_putc('\r');
110
111 /* Wait for last character to go. */
112 while (!(psc->psc_status & PSC_SR_TXEMP))
113 ;
114
115 psc->psc_buffer_8 = c;
116}
117
118void
119serial_puts (const char *s)
120{
121 while (*s) {
122 serial_putc (*s++);
123 }
124}
125
126int
127serial_getc(void)
128{
129 volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)PSC_BASE;
130
131 /* Wait for a character to arrive. */
132 while (!(psc->psc_status & PSC_SR_RXRDY))
133 ;
134
135 return psc->psc_buffer_8;
136}
137
138int
139serial_tstc(void)
140{
141 volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)PSC_BASE;
142
143 return (psc->psc_status & PSC_SR_RXRDY);
144}
145
146void
147serial_setbrg(void)
148{
149 DECLARE_GLOBAL_DATA_PTR;
150
151 volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)PSC_BASE;
152 unsigned long baseclk, div;
153
154#if defined(CONFIG_MGT5100)
155 baseclk = CFG_MPC5XXX_CLKIN / 32;
156#elif defined(CONFIG_MPC5200)
157 baseclk = gd->ipb_clk / 32;
158#endif
159
160 /* set up UART divisor */
161 div = baseclk / gd->baudrate;
162 psc->ctur = div >> 8;
163 psc->ctlr = div & 0xff;
164}
165#endif /* CONFIG_PSC_CONSOLE */