399 строки
9.7 KiB
C
399 строки
9.7 KiB
C
/*
|
|
* 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:
|
|
*/
|