+++ /dev/null
-/*
- * 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/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/macints.h>
-
-extern unsigned long mac_videobase;
-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, line;
-#endif
-
-#if 0
-
-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
-}
-
-#endif /* 0 */
-
-#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))
-
-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.
- */
-
-static 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;
-}
-
-static 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++);
- }
-}
-
-static 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)
-
-static void __init mac_init_scc_port(int cflag, int port)
-{
- /*
- * 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);
- }
-}
-#endif /* DEBUG_SERIAL */
-
-static int __init mac_debug_setup(char *arg)
-{
- if (!MACH_IS_MAC)
- return 0;
-
-#ifdef DEBUG_SERIAL
- if (!strcmp(arg, "ser") || !strcmp(arg, "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(arg, "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(arg, "scn") || !strcmp(arg, "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);
- return 0;
-}
-
-early_param("debug", mac_debug_setup);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff