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Linux/arch/blackfin/kernel/early_printk.c

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  1 /*
  2  * allow a console to be used for early printk
  3  * derived from arch/x86/kernel/early_printk.c
  4  *
  5  * Copyright 2007-2009 Analog Devices Inc.
  6  *
  7  * Licensed under the GPL-2
  8  */
  9 
 10 #include <linux/kernel.h>
 11 #include <linux/init.h>
 12 #include <linux/serial_core.h>
 13 #include <linux/console.h>
 14 #include <linux/string.h>
 15 #include <linux/reboot.h>
 16 #include <asm/blackfin.h>
 17 #include <asm/irq_handler.h>
 18 #include <asm/early_printk.h>
 19 
 20 #ifdef CONFIG_SERIAL_BFIN
 21 extern struct console *bfin_earlyserial_init(unsigned int port,
 22                                                 unsigned int cflag);
 23 #endif
 24 #ifdef CONFIG_BFIN_JTAG_COMM
 25 extern struct console *bfin_jc_early_init(void);
 26 #endif
 27 
 28 /* Default console */
 29 #define DEFAULT_PORT 0
 30 #define DEFAULT_CFLAG CS8|B57600
 31 
 32 /* Default console for early crashes */
 33 #define DEFAULT_EARLY_PORT "serial,uart0,57600"
 34 
 35 #ifdef CONFIG_SERIAL_CORE
 36 /* What should get here is "0,57600" */
 37 static struct console * __init earlyserial_init(char *buf)
 38 {
 39         int baud, bit;
 40         char parity;
 41         unsigned int serial_port = DEFAULT_PORT;
 42         unsigned int cflag = DEFAULT_CFLAG;
 43 
 44         serial_port = simple_strtoul(buf, &buf, 10);
 45         buf++;
 46 
 47         cflag = 0;
 48         baud = simple_strtoul(buf, &buf, 10);
 49         switch (baud) {
 50         case 1200:
 51                 cflag |= B1200;
 52                 break;
 53         case 2400:
 54                 cflag |= B2400;
 55                 break;
 56         case 4800:
 57                 cflag |= B4800;
 58                 break;
 59         case 9600:
 60                 cflag |= B9600;
 61                 break;
 62         case 19200:
 63                 cflag |= B19200;
 64                 break;
 65         case 38400:
 66                 cflag |= B38400;
 67                 break;
 68         case 115200:
 69                 cflag |= B115200;
 70                 break;
 71         default:
 72                 cflag |= B57600;
 73         }
 74 
 75         parity = buf[0];
 76         buf++;
 77         switch (parity) {
 78         case 'e':
 79                 cflag |= PARENB;
 80                 break;
 81         case 'o':
 82                 cflag |= PARODD;
 83                 break;
 84         }
 85 
 86         bit = simple_strtoul(buf, &buf, 10);
 87         switch (bit) {
 88         case 5:
 89                 cflag |= CS5;
 90                 break;
 91         case 6:
 92                 cflag |= CS6;
 93                 break;
 94         case 7:
 95                 cflag |= CS7;
 96                 break;
 97         default:
 98                 cflag |= CS8;
 99         }
100 
101 #ifdef CONFIG_SERIAL_BFIN
102         return bfin_earlyserial_init(serial_port, cflag);
103 #else
104         return NULL;
105 #endif
106 
107 }
108 #endif
109 
110 int __init setup_early_printk(char *buf)
111 {
112 
113         /* Crashing in here would be really bad, so check both the var
114            and the pointer before we start using it
115          */
116         if (!buf)
117                 return 0;
118 
119         if (!*buf)
120                 return 0;
121 
122         if (early_console != NULL)
123                 return 0;
124 
125 #ifdef CONFIG_SERIAL_BFIN
126         /* Check for Blackfin Serial */
127         if (!strncmp(buf, "serial,uart", 11)) {
128                 buf += 11;
129                 early_console = earlyserial_init(buf);
130         }
131 #endif
132 
133 #ifdef CONFIG_BFIN_JTAG_COMM
134         /* Check for Blackfin JTAG */
135         if (!strncmp(buf, "jtag", 4)) {
136                 buf += 4;
137                 early_console = bfin_jc_early_init();
138         }
139 #endif
140 
141 #ifdef CONFIG_FB
142                 /* TODO: add framebuffer console support */
143 #endif
144 
145         if (likely(early_console)) {
146                 early_console->flags |= CON_BOOT;
147 
148                 register_console(early_console);
149                 printk(KERN_INFO "early printk enabled on %s%d\n",
150                         early_console->name,
151                         early_console->index);
152         }
153 
154         return 0;
155 }
156 
157 /*
158  * Set up a temporary Event Vector Table, so if something bad happens before
159  * the kernel is fully started, it doesn't vector off into somewhere we don't
160  * know
161  */
162 
163 asmlinkage void __init init_early_exception_vectors(void)
164 {
165         u32 evt;
166         SSYNC();
167 
168         /*
169          * This starts up the shadow buffer, incase anything crashes before
170          * setup arch
171          */
172         mark_shadow_error();
173         early_shadow_puts(linux_banner);
174         early_shadow_stamp();
175 
176         if (CPUID != bfin_cpuid()) {
177                 early_shadow_puts("Running on wrong machine type, expected");
178                 early_shadow_reg(CPUID, 16);
179                 early_shadow_puts(", but running on");
180                 early_shadow_reg(bfin_cpuid(), 16);
181                 early_shadow_puts("\n");
182         }
183 
184         /* cannot program in software:
185          * evt0 - emulation (jtag)
186          * evt1 - reset
187          */
188         for (evt = EVT2; evt <= EVT15; evt += 4)
189                 bfin_write32(evt, early_trap);
190         CSYNC();
191 
192         /* Set all the return from interrupt, exception, NMI to a known place
193          * so if we do a RETI, RETX or RETN by mistake - we go somewhere known
194          * Note - don't change RETS - we are in a subroutine, or
195          * RETE - since it might screw up if emulator is attached
196          */
197         asm("\tRETI = %0; RETX = %0; RETN = %0;\n"
198                 : : "p"(early_trap));
199 
200 }
201 
202 __attribute__((__noreturn__))
203 asmlinkage void __init early_trap_c(struct pt_regs *fp, void *retaddr)
204 {
205         /* This can happen before the uart is initialized, so initialize
206          * the UART now (but only if we are running on the processor we think
207          * we are compiled for - otherwise we write to MMRs that don't exist,
208          * and cause other problems. Nothing comes out the UART, but it does
209          * end up in the __buf_log.
210          */
211         if (likely(early_console == NULL) && CPUID == bfin_cpuid())
212                 setup_early_printk(DEFAULT_EARLY_PORT);
213 
214         if (!shadow_console_enabled()) {
215                 /* crap - we crashed before setup_arch() */
216                 early_shadow_puts("panic before setup_arch\n");
217                 early_shadow_puts("IPEND:");
218                 early_shadow_reg(fp->ipend, 16);
219                 if (fp->seqstat & SEQSTAT_EXCAUSE) {
220                         early_shadow_puts("\nEXCAUSE:");
221                         early_shadow_reg(fp->seqstat & SEQSTAT_EXCAUSE, 8);
222                 }
223                 if (fp->seqstat & SEQSTAT_HWERRCAUSE) {
224                         early_shadow_puts("\nHWERRCAUSE:");
225                         early_shadow_reg(
226                                 (fp->seqstat & SEQSTAT_HWERRCAUSE) >> 14, 8);
227                 }
228                 early_shadow_puts("\nErr @");
229                 if (fp->ipend & EVT_EVX)
230                         early_shadow_reg(fp->retx, 32);
231                 else
232                         early_shadow_reg(fp->pc, 32);
233 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
234                 early_shadow_puts("\nTrace:");
235                 if (likely(bfin_read_TBUFSTAT() & TBUFCNT)) {
236                         while (bfin_read_TBUFSTAT() & TBUFCNT) {
237                                 early_shadow_puts("\nT  :");
238                                 early_shadow_reg(bfin_read_TBUF(), 32);
239                                 early_shadow_puts("\n S :");
240                                 early_shadow_reg(bfin_read_TBUF(), 32);
241                         }
242                 }
243 #endif
244                 early_shadow_puts("\nUse bfin-elf-addr2line to determine "
245                         "function names\n");
246                 /*
247                  * We should panic(), but we can't - since panic calls printk,
248                  * and printk uses memcpy.
249                  * we want to reboot, but if the machine type is different,
250                  * can't due to machine specific reboot sequences
251                  */
252                 if (CPUID == bfin_cpuid()) {
253                         early_shadow_puts("Trying to restart\n");
254                         machine_restart("");
255                 }
256 
257                 early_shadow_puts("Halting, since it is not safe to restart\n");
258                 while (1)
259                         asm volatile ("EMUEXCPT; IDLE;\n");
260 
261         } else {
262                 printk(KERN_EMERG "Early panic\n");
263                 show_regs(fp);
264                 dump_bfin_trace_buffer();
265         }
266 
267         panic("Died early");
268 }
269 
270 early_param("earlyprintk", setup_early_printk);
271 

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