[POWERPC] Celleb: setup sio in SCC
[linux-2.6.git] / arch / powerpc / platforms / celleb / scc_sio.c
1 /*
2  * setup serial port in SCC
3  *
4  * (C) Copyright 2006 TOSHIBA CORPORATION
5  *
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.
10  *
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.
15  *
16  * You should have received a copy of the GNU General Public License along
17  * with this program; if not, write to the Free Software Foundation, Inc.,
18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
19  */
20
21 #include <linux/tty.h>
22 #include <linux/serial.h>
23 #include <linux/serial_core.h>
24 #include <linux/console.h>
25
26 #include <asm/io.h>
27 #include <asm/prom.h>
28
29 /* sio irq0=0xb00010022 irq0=0xb00010023 irq2=0xb00010024
30     mmio=0xfff000-0x1000,0xff2000-0x1000 */
31 static int txx9_serial_bitmap = 0;
32
33 static struct {
34         uint32_t offset;
35         uint32_t index;
36 } txx9_scc_tab[3] = {
37         { 0x300, 0 },   /* 0xFFF300 */
38         { 0x400, 0 },   /* 0xFFF400 */
39         { 0x800, 1 }    /* 0xFF2800 */
40 };
41
42 static int txx9_serial_init(void)
43 {
44         extern int early_serial_txx9_setup(struct uart_port *port);
45         struct device_node *node;
46         int i;
47         struct uart_port req;
48         struct of_irq irq;
49         struct resource res;
50
51         node = of_find_node_by_path("/ioif1/sio");
52         if (!node)
53                 return 0;
54
55         for(i = 0; i < sizeof(txx9_scc_tab)/sizeof(txx9_scc_tab[0]); i++) {
56                 if (!(txx9_serial_bitmap & (1<<i)))
57                         continue;
58
59                 if (of_irq_map_one(node, i, &irq))
60                         continue;
61                 if (of_address_to_resource(node, txx9_scc_tab[i].index, &res))
62                         continue;
63
64                 memset(&req, 0, sizeof(req));
65                 req.line = i;
66                 req.iotype = UPIO_MEM;
67                 req.mapbase = res.start + txx9_scc_tab[i].offset;
68 #ifdef CONFIG_SERIAL_TXX9_CONSOLE
69                 req.membase = ioremap(req.mapbase, 0x24);
70 #endif
71                 req.irq = irq_create_of_mapping(irq.controller,
72                         irq.specifier, irq.size);
73                 req.flags |= UPF_IOREMAP | UPF_BUGGY_UART /*HAVE_CTS_LINE*/;
74                 req.uartclk = 83300000;
75                 early_serial_txx9_setup(&req);
76         }
77
78         of_node_put(node);
79         return 0;
80 }
81
82 static int txx9_serial_config(char *ptr)
83 {
84         int     i;
85
86         for (;;) {
87                 switch(get_option(&ptr, &i)) {
88                 default:
89                         return 0;
90                 case 2:
91                         txx9_serial_bitmap |= 1 << i;
92                         break;
93                 case 1:
94                         txx9_serial_bitmap |= 1 << i;
95                         return 0;
96                 }
97         }
98 }
99 __setup("txx9_serial=", txx9_serial_config);
100
101 console_initcall(txx9_serial_init);