Merge gregkh@master.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-rc-fixes-2.6
[linux-2.6] / arch / arm / plat-omap / common.c
1 /*
2  * linux/arch/arm/plat-omap/common.c
3  *
4  * Code common to all OMAP machines.
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 version 2 as
8  * published by the Free Software Foundation.
9  */
10 #include <linux/module.h>
11 #include <linux/kernel.h>
12 #include <linux/init.h>
13 #include <linux/delay.h>
14 #include <linux/pm.h>
15 #include <linux/console.h>
16 #include <linux/serial.h>
17 #include <linux/tty.h>
18 #include <linux/serial_8250.h>
19 #include <linux/serial_reg.h>
20 #include <linux/clk.h>
21
22 #include <asm/hardware.h>
23 #include <asm/system.h>
24 #include <asm/pgtable.h>
25 #include <asm/mach/map.h>
26 #include <asm/io.h>
27 #include <asm/setup.h>
28
29 #include <asm/arch/board.h>
30 #include <asm/arch/mux.h>
31 #include <asm/arch/fpga.h>
32
33 #include <asm/arch/clock.h>
34
35 #define NO_LENGTH_CHECK 0xffffffff
36
37 unsigned char omap_bootloader_tag[512];
38 int omap_bootloader_tag_len;
39
40 struct omap_board_config_kernel *omap_board_config;
41 int omap_board_config_size;
42
43 static const void *get_config(u16 tag, size_t len, int skip, size_t *len_out)
44 {
45         struct omap_board_config_kernel *kinfo = NULL;
46         int i;
47
48 #ifdef CONFIG_OMAP_BOOT_TAG
49         struct omap_board_config_entry *info = NULL;
50
51         if (omap_bootloader_tag_len > 4)
52                 info = (struct omap_board_config_entry *) omap_bootloader_tag;
53         while (info != NULL) {
54                 u8 *next;
55
56                 if (info->tag == tag) {
57                         if (skip == 0)
58                                 break;
59                         skip--;
60                 }
61
62                 if ((info->len & 0x03) != 0) {
63                         /* We bail out to avoid an alignment fault */
64                         printk(KERN_ERR "OMAP peripheral config: Length (%d) not word-aligned (tag %04x)\n",
65                                info->len, info->tag);
66                         return NULL;
67                 }
68                 next = (u8 *) info + sizeof(*info) + info->len;
69                 if (next >= omap_bootloader_tag + omap_bootloader_tag_len)
70                         info = NULL;
71                 else
72                         info = (struct omap_board_config_entry *) next;
73         }
74         if (info != NULL) {
75                 /* Check the length as a lame attempt to check for
76                  * binary inconsistancy. */
77                 if (len != NO_LENGTH_CHECK) {
78                         /* Word-align len */
79                         if (len & 0x03)
80                                 len = (len + 3) & ~0x03;
81                         if (info->len != len) {
82                                 printk(KERN_ERR "OMAP peripheral config: Length mismatch with tag %x (want %d, got %d)\n",
83                                        tag, len, info->len);
84                                 return NULL;
85                         }
86                 }
87                 if (len_out != NULL)
88                         *len_out = info->len;
89                 return info->data;
90         }
91 #endif
92         /* Try to find the config from the board-specific structures
93          * in the kernel. */
94         for (i = 0; i < omap_board_config_size; i++) {
95                 if (omap_board_config[i].tag == tag) {
96                         kinfo = &omap_board_config[i];
97                         break;
98                 }
99         }
100         if (kinfo == NULL)
101                 return NULL;
102         return kinfo->data;
103 }
104
105 const void *__omap_get_config(u16 tag, size_t len, int nr)
106 {
107         return get_config(tag, len, nr, NULL);
108 }
109 EXPORT_SYMBOL(__omap_get_config);
110
111 const void *omap_get_var_config(u16 tag, size_t *len)
112 {
113         return get_config(tag, NO_LENGTH_CHECK, 0, len);
114 }
115 EXPORT_SYMBOL(omap_get_var_config);
116
117 static int __init omap_add_serial_console(void)
118 {
119         const struct omap_serial_console_config *con_info;
120         const struct omap_uart_config *uart_info;
121         static char speed[11], *opt = NULL;
122         int line, i, uart_idx;
123
124         uart_info = omap_get_config(OMAP_TAG_UART, struct omap_uart_config);
125         con_info = omap_get_config(OMAP_TAG_SERIAL_CONSOLE,
126                                         struct omap_serial_console_config);
127         if (uart_info == NULL || con_info == NULL)
128                 return 0;
129
130         if (con_info->console_uart == 0)
131                 return 0;
132
133         if (con_info->console_speed) {
134                 snprintf(speed, sizeof(speed), "%u", con_info->console_speed);
135                 opt = speed;
136         }
137
138         uart_idx = con_info->console_uart - 1;
139         if (uart_idx >= OMAP_MAX_NR_PORTS) {
140                 printk(KERN_INFO "Console: external UART#%d. "
141                         "Not adding it as console this time.\n",
142                         uart_idx + 1);
143                 return 0;
144         }
145         if (!(uart_info->enabled_uarts & (1 << uart_idx))) {
146                 printk(KERN_ERR "Console: Selected UART#%d is "
147                         "not enabled for this platform\n",
148                         uart_idx + 1);
149                 return -1;
150         }
151         line = 0;
152         for (i = 0; i < uart_idx; i++) {
153                 if (uart_info->enabled_uarts & (1 << i))
154                         line++;
155         }
156         return add_preferred_console("ttyS", line, opt);
157 }
158 console_initcall(omap_add_serial_console);