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Linux/arch/sh/kernel/sh_bios.c

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  1 /*
  2  *  C interface for trapping into the standard LinuxSH BIOS.
  3  *
  4  *  Copyright (C) 2000 Greg Banks, Mitch Davis
  5  *  Copyright (C) 1999, 2000  Niibe Yutaka
  6  *  Copyright (C) 2002  M. R. Brown
  7  *  Copyright (C) 2004 - 2010  Paul Mundt
  8  *
  9  * This file is subject to the terms and conditions of the GNU General Public
 10  * License.  See the file "COPYING" in the main directory of this archive
 11  * for more details.
 12  */
 13 #include <linux/module.h>
 14 #include <linux/console.h>
 15 #include <linux/tty.h>
 16 #include <linux/init.h>
 17 #include <linux/io.h>
 18 #include <linux/delay.h>
 19 #include <asm/sh_bios.h>
 20 
 21 #define BIOS_CALL_CONSOLE_WRITE         0
 22 #define BIOS_CALL_ETH_NODE_ADDR         10
 23 #define BIOS_CALL_SHUTDOWN              11
 24 #define BIOS_CALL_GDB_DETACH            0xff
 25 
 26 void *gdb_vbr_vector = NULL;
 27 
 28 static inline long sh_bios_call(long func, long arg0, long arg1, long arg2,
 29                                     long arg3)
 30 {
 31         register long r0 __asm__("r0") = func;
 32         register long r4 __asm__("r4") = arg0;
 33         register long r5 __asm__("r5") = arg1;
 34         register long r6 __asm__("r6") = arg2;
 35         register long r7 __asm__("r7") = arg3;
 36 
 37         if (!gdb_vbr_vector)
 38                 return -ENOSYS;
 39 
 40         __asm__ __volatile__("trapa     #0x3f":"=z"(r0)
 41                              :""(r0), "r"(r4), "r"(r5), "r"(r6), "r"(r7)
 42                              :"memory");
 43         return r0;
 44 }
 45 
 46 void sh_bios_console_write(const char *buf, unsigned int len)
 47 {
 48         sh_bios_call(BIOS_CALL_CONSOLE_WRITE, (long)buf, (long)len, 0, 0);
 49 }
 50 
 51 void sh_bios_gdb_detach(void)
 52 {
 53         sh_bios_call(BIOS_CALL_GDB_DETACH, 0, 0, 0, 0);
 54 }
 55 EXPORT_SYMBOL_GPL(sh_bios_gdb_detach);
 56 
 57 void sh_bios_get_node_addr(unsigned char *node_addr)
 58 {
 59         sh_bios_call(BIOS_CALL_ETH_NODE_ADDR, 0, (long)node_addr, 0, 0);
 60 }
 61 EXPORT_SYMBOL_GPL(sh_bios_get_node_addr);
 62 
 63 void sh_bios_shutdown(unsigned int how)
 64 {
 65         sh_bios_call(BIOS_CALL_SHUTDOWN, how, 0, 0, 0);
 66 }
 67 
 68 /*
 69  * Read the old value of the VBR register to initialise the vector
 70  * through which debug and BIOS traps are delegated by the Linux trap
 71  * handler.
 72  */
 73 void sh_bios_vbr_init(void)
 74 {
 75         unsigned long vbr;
 76 
 77         if (unlikely(gdb_vbr_vector))
 78                 return;
 79 
 80         __asm__ __volatile__ ("stc vbr, %0" : "=r" (vbr));
 81 
 82         if (vbr) {
 83                 gdb_vbr_vector = (void *)(vbr + 0x100);
 84                 printk(KERN_NOTICE "Setting GDB trap vector to %p\n",
 85                        gdb_vbr_vector);
 86         } else
 87                 printk(KERN_NOTICE "SH-BIOS not detected\n");
 88 }
 89 
 90 /**
 91  * sh_bios_vbr_reload - Re-load the system VBR from the BIOS vector.
 92  *
 93  * This can be used by save/restore code to reinitialize the system VBR
 94  * from the fixed BIOS VBR. A no-op if no BIOS VBR is known.
 95  */
 96 void sh_bios_vbr_reload(void)
 97 {
 98         if (gdb_vbr_vector)
 99                 __asm__ __volatile__ (
100                         "ldc %0, vbr"
101                         :
102                         : "r" (((unsigned long) gdb_vbr_vector) - 0x100)
103                         : "memory"
104                 );
105 }
106 
107 #ifdef CONFIG_EARLY_PRINTK
108 /*
109  *      Print a string through the BIOS
110  */
111 static void sh_console_write(struct console *co, const char *s,
112                                  unsigned count)
113 {
114         sh_bios_console_write(s, count);
115 }
116 
117 /*
118  *      Setup initial baud/bits/parity. We do two things here:
119  *      - construct a cflag setting for the first rs_open()
120  *      - initialize the serial port
121  *      Return non-zero if we didn't find a serial port.
122  */
123 static int __init sh_console_setup(struct console *co, char *options)
124 {
125         int     cflag = CREAD | HUPCL | CLOCAL;
126 
127         /*
128          *      Now construct a cflag setting.
129          *      TODO: this is a totally bogus cflag, as we have
130          *      no idea what serial settings the BIOS is using, or
131          *      even if its using the serial port at all.
132          */
133         cflag |= B115200 | CS8 | /*no parity*/0;
134 
135         co->cflag = cflag;
136 
137         return 0;
138 }
139 
140 static struct console bios_console = {
141         .name           = "bios",
142         .write          = sh_console_write,
143         .setup          = sh_console_setup,
144         .flags          = CON_PRINTBUFFER,
145         .index          = -1,
146 };
147 
148 static int __init setup_early_printk(char *buf)
149 {
150         int keep_early = 0;
151 
152         if (!buf)
153                 return 0;
154 
155         if (strstr(buf, "keep"))
156                 keep_early = 1;
157 
158         if (!strncmp(buf, "bios", 4))
159                 early_console = &bios_console;
160 
161         if (likely(early_console)) {
162                 if (keep_early)
163                         early_console->flags &= ~CON_BOOT;
164                 else
165                         early_console->flags |= CON_BOOT;
166                 register_console(early_console);
167         }
168 
169         return 0;
170 }
171 early_param("earlyprintk", setup_early_printk);
172 #endif
173 

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