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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/m68k/mac/debug.c
downloadconfigs-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/m68k/mac/debug.c')
-rw-r--r--arch/m68k/mac/debug.c398
1 files changed, 398 insertions, 0 deletions
diff --git a/arch/m68k/mac/debug.c b/arch/m68k/mac/debug.c
new file mode 100644
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+++ b/arch/m68k/mac/debug.c
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+/*
+ * linux/arch/m68k/mac/debug.c
+ *
+ * Shamelessly stolen (SCC code and general framework) from:
+ *
+ * linux/arch/m68k/atari/debug.c
+ *
+ * Atari debugging and serial console stuff
+ *
+ * Assembled of parts of former atari/config.c 97-12-18 by Roman Hodek
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file COPYING in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/tty.h>
+#include <linux/console.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+
+#define BOOTINFO_COMPAT_1_0
+#include <asm/setup.h>
+#include <asm/bootinfo.h>
+#include <asm/machw.h>
+#include <asm/macints.h>
+
+extern char m68k_debug_device[];
+
+extern struct compat_bootinfo compat_boot_info;
+
+extern unsigned long mac_videobase;
+extern unsigned long mac_videodepth;
+extern unsigned long mac_rowbytes;
+
+extern void mac_serial_print(const char *);
+
+#define DEBUG_HEADS
+#undef DEBUG_SCREEN
+#define DEBUG_SERIAL
+
+/*
+ * These two auxiliary debug functions should go away ASAP. Only usage:
+ * before the console output is up (after head.S come some other crucial
+ * setup routines :-) it permits writing 'data' to the screen as bit patterns
+ * (good luck reading those). Helped to figure that the bootinfo contained
+ * garbage data on the amount and size of memory chunks ...
+ *
+ * The 'pos' argument now simply means 'linefeed after print' ...
+ */
+
+#ifdef DEBUG_SCREEN
+static int peng=0, line=0;
+#endif
+
+void mac_debugging_short(int pos, short num)
+{
+#ifdef DEBUG_SCREEN
+ unsigned char *pengoffset;
+ unsigned char *pptr;
+ int i;
+#endif
+
+#ifdef DEBUG_SERIAL
+ printk("debug: %d !\n", num);
+#endif
+
+#ifdef DEBUG_SCREEN
+ if (!MACH_IS_MAC) {
+ /* printk("debug: %d !\n", num); */
+ return;
+ }
+
+ /* calculate current offset */
+ pengoffset=(unsigned char *)(mac_videobase+(150+line*2)*mac_rowbytes)
+ +80*peng;
+
+ pptr=pengoffset;
+
+ for(i=0;i<8*sizeof(short);i++) /* # of bits */
+ {
+ /* value mask for bit i, reverse order */
+ *pptr++ = (num & ( 1 << (8*sizeof(short)-i-1) ) ? 0xFF : 0x00);
+ }
+
+ peng++;
+
+ if (pos) {
+ line++;
+ peng = 0;
+ }
+#endif
+}
+
+void mac_debugging_long(int pos, long addr)
+{
+#ifdef DEBUG_SCREEN
+ unsigned char *pengoffset;
+ unsigned char *pptr;
+ int i;
+#endif
+
+#ifdef DEBUG_SERIAL
+ printk("debug: #%ld !\n", addr);
+#endif
+
+#ifdef DEBUG_SCREEN
+ if (!MACH_IS_MAC) {
+ /* printk("debug: #%ld !\n", addr); */
+ return;
+ }
+
+ pengoffset=(unsigned char *)(mac_videobase+(150+line*2)*mac_rowbytes)
+ +80*peng;
+
+ pptr=pengoffset;
+
+ for(i=0;i<8*sizeof(long);i++) /* # of bits */
+ {
+ *pptr++ = (addr & ( 1 << (8*sizeof(long)-i-1) ) ? 0xFF : 0x00);
+ }
+
+ peng++;
+
+ if (pos) {
+ line++;
+ peng = 0;
+ }
+#endif
+}
+
+#ifdef DEBUG_SERIAL
+/*
+ * TODO: serial debug code
+ */
+
+struct mac_SCC
+ {
+ u_char cha_b_ctrl;
+ u_char char_dummy1;
+ u_char cha_a_ctrl;
+ u_char char_dummy2;
+ u_char cha_b_data;
+ u_char char_dummy3;
+ u_char cha_a_data;
+ };
+
+# define scc (*((volatile struct mac_SCC*)mac_bi_data.sccbase))
+
+/* Flag that serial port is already initialized and used */
+int mac_SCC_init_done;
+/* Can be set somewhere, if a SCC master reset has already be done and should
+ * not be repeated; used by kgdb */
+int mac_SCC_reset_done;
+
+static int scc_port = -1;
+
+static struct console mac_console_driver = {
+ .name = "debug",
+ .flags = CON_PRINTBUFFER,
+ .index = -1,
+};
+
+/*
+ * Crude hack to get console output to the screen before the framebuffer
+ * is initialized (happens a lot later in 2.1!).
+ * We just use the console routines declared in head.S, this will interfere
+ * with regular framebuffer console output and should be used exclusively
+ * to debug kernel problems manifesting before framebuffer init (aka WSOD)
+ *
+ * To keep this hack from interfering with the regular console driver, either
+ * deregister this driver before/on framebuffer console init, or silence this
+ * function after the fbcon driver is running (will lose console messages!?).
+ * To debug real early bugs, need to write a 'mac_register_console_hack()'
+ * that is called from start_kernel() before setup_arch() and just registers
+ * this driver if Mac.
+ */
+
+void mac_debug_console_write (struct console *co, const char *str,
+ unsigned int count)
+{
+ mac_serial_print(str);
+}
+
+
+
+/* Mac: loops_per_jiffy min. 19000 ^= .5 us; MFPDELAY was 0.6 us*/
+
+#define uSEC 1
+
+static inline void mac_sccb_out (char c)
+{
+ int i;
+ do {
+ for( i = uSEC; i > 0; --i )
+ barrier();
+ } while (!(scc.cha_b_ctrl & 0x04)); /* wait for tx buf empty */
+ for( i = uSEC; i > 0; --i )
+ barrier();
+ scc.cha_b_data = c;
+}
+
+static inline void mac_scca_out (char c)
+{
+ int i;
+ do {
+ for( i = uSEC; i > 0; --i )
+ barrier();
+ } while (!(scc.cha_a_ctrl & 0x04)); /* wait for tx buf empty */
+ for( i = uSEC; i > 0; --i )
+ barrier();
+ scc.cha_a_data = c;
+}
+
+void mac_sccb_console_write (struct console *co, const char *str,
+ unsigned int count)
+{
+ while (count--) {
+ if (*str == '\n')
+ mac_sccb_out( '\r' );
+ mac_sccb_out( *str++ );
+ }
+}
+
+void mac_scca_console_write (struct console *co, const char *str,
+ unsigned int count)
+{
+ while (count--) {
+ if (*str == '\n')
+ mac_scca_out( '\r' );
+ mac_scca_out( *str++ );
+ }
+}
+
+
+/* The following two functions do a quick'n'dirty initialization of the MFP or
+ * SCC serial ports. They're used by the debugging interface, kgdb, and the
+ * serial console code. */
+#define SCCB_WRITE(reg,val) \
+ do { \
+ int i; \
+ scc.cha_b_ctrl = (reg); \
+ for( i = uSEC; i > 0; --i ) \
+ barrier(); \
+ scc.cha_b_ctrl = (val); \
+ for( i = uSEC; i > 0; --i ) \
+ barrier(); \
+ } while(0)
+
+#define SCCA_WRITE(reg,val) \
+ do { \
+ int i; \
+ scc.cha_a_ctrl = (reg); \
+ for( i = uSEC; i > 0; --i ) \
+ barrier(); \
+ scc.cha_a_ctrl = (val); \
+ for( i = uSEC; i > 0; --i ) \
+ barrier(); \
+ } while(0)
+
+/* loops_per_jiffy isn't initialized yet, so we can't use udelay(). This does a
+ * delay of ~ 60us. */
+/* Mac: loops_per_jiffy min. 19000 ^= .5 us; MFPDELAY was 0.6 us*/
+#define LONG_DELAY() \
+ do { \
+ int i; \
+ for( i = 60*uSEC; i > 0; --i ) \
+ barrier(); \
+ } while(0)
+
+#ifndef CONFIG_SERIAL_CONSOLE
+static void __init mac_init_scc_port( int cflag, int port )
+#else
+void mac_init_scc_port( int cflag, int port )
+#endif
+{
+ extern int mac_SCC_reset_done;
+
+ /*
+ * baud rates: 1200, 1800, 2400, 4800, 9600, 19.2k, 38.4k, 57.6k, 115.2k
+ */
+
+ static int clksrc_table[9] =
+ /* reg 11: 0x50 = BRG, 0x00 = RTxC, 0x28 = TRxC */
+ { 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x00, 0x00 };
+ static int clkmode_table[9] =
+ /* reg 4: 0x40 = x16, 0x80 = x32, 0xc0 = x64 */
+ { 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0xc0, 0x80 };
+ static int div_table[9] =
+ /* reg12 (BRG low) */
+ { 94, 62, 46, 22, 10, 4, 1, 0, 0 };
+
+ int baud = cflag & CBAUD;
+ int clksrc, clkmode, div, reg3, reg5;
+
+ if (cflag & CBAUDEX)
+ baud += B38400;
+ if (baud < B1200 || baud > B38400+2)
+ baud = B9600; /* use default 9600bps for non-implemented rates */
+ baud -= B1200; /* tables starts at 1200bps */
+
+ clksrc = clksrc_table[baud];
+ clkmode = clkmode_table[baud];
+ div = div_table[baud];
+
+ reg3 = (((cflag & CSIZE) == CS8) ? 0xc0 : 0x40);
+ reg5 = (((cflag & CSIZE) == CS8) ? 0x60 : 0x20) | 0x82 /* assert DTR/RTS */;
+
+ if (port == 1) {
+ (void)scc.cha_b_ctrl; /* reset reg pointer */
+ SCCB_WRITE( 9, 0xc0 ); /* reset */
+ LONG_DELAY(); /* extra delay after WR9 access */
+ SCCB_WRITE( 4, (cflag & PARENB) ? ((cflag & PARODD) ? 0x01 : 0x03) : 0 |
+ 0x04 /* 1 stopbit */ |
+ clkmode );
+ SCCB_WRITE( 3, reg3 );
+ SCCB_WRITE( 5, reg5 );
+ SCCB_WRITE( 9, 0 ); /* no interrupts */
+ LONG_DELAY(); /* extra delay after WR9 access */
+ SCCB_WRITE( 10, 0 ); /* NRZ mode */
+ SCCB_WRITE( 11, clksrc ); /* main clock source */
+ SCCB_WRITE( 12, div ); /* BRG value */
+ SCCB_WRITE( 13, 0 ); /* BRG high byte */
+ SCCB_WRITE( 14, 1 );
+ SCCB_WRITE( 3, reg3 | 1 );
+ SCCB_WRITE( 5, reg5 | 8 );
+ } else if (port == 0) {
+ (void)scc.cha_a_ctrl; /* reset reg pointer */
+ SCCA_WRITE( 9, 0xc0 ); /* reset */
+ LONG_DELAY(); /* extra delay after WR9 access */
+ SCCA_WRITE( 4, (cflag & PARENB) ? ((cflag & PARODD) ? 0x01 : 0x03) : 0 |
+ 0x04 /* 1 stopbit */ |
+ clkmode );
+ SCCA_WRITE( 3, reg3 );
+ SCCA_WRITE( 5, reg5 );
+ SCCA_WRITE( 9, 0 ); /* no interrupts */
+ LONG_DELAY(); /* extra delay after WR9 access */
+ SCCA_WRITE( 10, 0 ); /* NRZ mode */
+ SCCA_WRITE( 11, clksrc ); /* main clock source */
+ SCCA_WRITE( 12, div ); /* BRG value */
+ SCCA_WRITE( 13, 0 ); /* BRG high byte */
+ SCCA_WRITE( 14, 1 );
+ SCCA_WRITE( 3, reg3 | 1 );
+ SCCA_WRITE( 5, reg5 | 8 );
+ }
+
+ mac_SCC_reset_done = 1;
+ mac_SCC_init_done = 1;
+}
+#endif /* DEBUG_SERIAL */
+
+void mac_init_scca_port( int cflag )
+{
+ mac_init_scc_port(cflag, 0);
+}
+
+void mac_init_sccb_port( int cflag )
+{
+ mac_init_scc_port(cflag, 1);
+}
+
+void __init mac_debug_init(void)
+{
+#ifdef DEBUG_SERIAL
+ if ( !strcmp( m68k_debug_device, "ser" )
+ || !strcmp( m68k_debug_device, "ser1" )) {
+ /* Mac modem port */
+ mac_init_scc_port( B9600|CS8, 0 );
+ mac_console_driver.write = mac_scca_console_write;
+ scc_port = 0;
+ }
+ else if (!strcmp( m68k_debug_device, "ser2" )) {
+ /* Mac printer port */
+ mac_init_scc_port( B9600|CS8, 1 );
+ mac_console_driver.write = mac_sccb_console_write;
+ scc_port = 1;
+ }
+#endif
+#ifdef DEBUG_HEADS
+ if ( !strcmp( m68k_debug_device, "scn" )
+ || !strcmp( m68k_debug_device, "con" )) {
+ /* display, using head.S console routines */
+ mac_console_driver.write = mac_debug_console_write;
+ }
+#endif
+ if (mac_console_driver.write)
+ register_console(&mac_console_driver);
+}
+
+/*
+ * Local variables:
+ * c-indent-level: 4
+ * tab-width: 8
+ * End:
+ */