1 /*
2 * setup serial port in SCC
3 *
4 * (C) Copyright 2006-2007 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 __initdata;
32
33 static struct {
34 uint32_t offset;
35 uint32_t index;
36 } txx9_scc_tab[3] __initdata = {
37 { 0x300, 0 }, /* 0xFFF300 */
38 { 0x400, 0 }, /* 0xFFF400 */
39 { 0x800, 1 } /* 0xFF2800 */
40 };
41
txx9_serial_init(void)42 static int __init txx9_serial_init(void)
43 {
44 extern int early_serial_txx9_setup(struct uart_port *port);
45 struct device_node *node = NULL;
46 int i;
47 struct uart_port req;
48 struct of_irq irq;
49 struct resource res;
50
51 while ((node = of_find_compatible_node(node,
52 "serial", "toshiba,sio-scc")) != NULL) {
53 for (i = 0; i < ARRAY_SIZE(txx9_scc_tab); i++) {
54 if (!(txx9_serial_bitmap & (1<<i)))
55 continue;
56
57 if (of_irq_map_one(node, i, &irq))
58 continue;
59 if (of_address_to_resource(node,
60 txx9_scc_tab[i].index, &res))
61 continue;
62
63 memset(&req, 0, sizeof(req));
64 req.line = i;
65 req.iotype = UPIO_MEM;
66 req.mapbase = res.start + txx9_scc_tab[i].offset;
67 #ifdef CONFIG_SERIAL_TXX9_CONSOLE
68 req.membase = ioremap(req.mapbase, 0x24);
69 #endif
70 req.irq = irq_create_of_mapping(irq.controller,
71 irq.specifier, irq.size);
72 req.flags |= UPF_IOREMAP | UPF_BUGGY_UART
73 /*HAVE_CTS_LINE*/;
74 req.uartclk = 83300000;
75 early_serial_txx9_setup(&req);
76 }
77 }
78
79 return 0;
80 }
81
txx9_serial_config(char * ptr)82 static int __init 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);
102