366 lines
8.7 KiB
C
366 lines
8.7 KiB
C
/*
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* linux/arch/m68k/mac/debug.c
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*
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* Shamelessly stolen (SCC code and general framework) from:
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*
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* linux/arch/m68k/atari/debug.c
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*
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* Atari debugging and serial console stuff
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*
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* Assembled of parts of former atari/config.c 97-12-18 by Roman Hodek
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive
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* for more details.
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*/
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#include <linux/types.h>
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#include <linux/sched.h>
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#include <linux/tty.h>
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#include <linux/console.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#define BOOTINFO_COMPAT_1_0
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#include <asm/setup.h>
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#include <asm/bootinfo.h>
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#include <asm/macints.h>
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extern unsigned long mac_videobase;
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extern unsigned long mac_rowbytes;
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extern void mac_serial_print(const char *);
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#define DEBUG_HEADS
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#undef DEBUG_SCREEN
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#define DEBUG_SERIAL
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/*
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* These two auxiliary debug functions should go away ASAP. Only usage:
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* before the console output is up (after head.S come some other crucial
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* setup routines :-) it permits writing 'data' to the screen as bit patterns
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* (good luck reading those). Helped to figure that the bootinfo contained
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* garbage data on the amount and size of memory chunks ...
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*
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* The 'pos' argument now simply means 'linefeed after print' ...
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*/
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#ifdef DEBUG_SCREEN
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static int peng, line;
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#endif
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#if 0
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void mac_debugging_short(int pos, short num)
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{
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#ifdef DEBUG_SCREEN
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unsigned char *pengoffset;
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unsigned char *pptr;
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int i;
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#endif
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#ifdef DEBUG_SERIAL
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printk("debug: %d !\n", num);
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#endif
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#ifdef DEBUG_SCREEN
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if (!MACH_IS_MAC) {
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/* printk("debug: %d !\n", num); */
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return;
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}
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/* calculate current offset */
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pengoffset = (unsigned char *)mac_videobase +
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(150+line*2) * mac_rowbytes + 80 * peng;
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pptr = pengoffset;
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for (i = 0; i < 8 * sizeof(short); i++) { /* # of bits */
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/* value mask for bit i, reverse order */
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*pptr++ = (num & (1 << (8*sizeof(short)-i-1)) ? 0xFF : 0x00);
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}
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peng++;
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if (pos) {
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line++;
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peng = 0;
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}
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#endif
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}
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void mac_debugging_long(int pos, long addr)
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{
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#ifdef DEBUG_SCREEN
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unsigned char *pengoffset;
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unsigned char *pptr;
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int i;
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#endif
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#ifdef DEBUG_SERIAL
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printk("debug: #%ld !\n", addr);
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#endif
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#ifdef DEBUG_SCREEN
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if (!MACH_IS_MAC) {
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/* printk("debug: #%ld !\n", addr); */
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return;
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}
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pengoffset=(unsigned char *)(mac_videobase+(150+line*2)*mac_rowbytes)
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+80*peng;
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pptr = pengoffset;
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for (i = 0; i < 8 * sizeof(long); i++) { /* # of bits */
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*pptr++ = (addr & (1 << (8*sizeof(long)-i-1)) ? 0xFF : 0x00);
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}
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peng++;
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if (pos) {
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line++;
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peng = 0;
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}
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#endif
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}
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#endif /* 0 */
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#ifdef DEBUG_SERIAL
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/*
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* TODO: serial debug code
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*/
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struct mac_SCC {
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u_char cha_b_ctrl;
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u_char char_dummy1;
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u_char cha_a_ctrl;
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u_char char_dummy2;
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u_char cha_b_data;
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u_char char_dummy3;
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u_char cha_a_data;
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};
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# define scc (*((volatile struct mac_SCC*)mac_bi_data.sccbase))
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static int scc_port = -1;
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static struct console mac_console_driver = {
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.name = "debug",
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.flags = CON_PRINTBUFFER,
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.index = -1,
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};
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/*
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* Crude hack to get console output to the screen before the framebuffer
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* is initialized (happens a lot later in 2.1!).
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* We just use the console routines declared in head.S, this will interfere
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* with regular framebuffer console output and should be used exclusively
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* to debug kernel problems manifesting before framebuffer init (aka WSOD)
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*
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* To keep this hack from interfering with the regular console driver, either
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* deregister this driver before/on framebuffer console init, or silence this
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* function after the fbcon driver is running (will lose console messages!?).
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* To debug real early bugs, need to write a 'mac_register_console_hack()'
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* that is called from start_kernel() before setup_arch() and just registers
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* this driver if Mac.
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*/
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static void mac_debug_console_write(struct console *co, const char *str,
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unsigned int count)
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{
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mac_serial_print(str);
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}
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/* Mac: loops_per_jiffy min. 19000 ^= .5 us; MFPDELAY was 0.6 us*/
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#define uSEC 1
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static inline void mac_sccb_out(char c)
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{
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int i;
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do {
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for (i = uSEC; i > 0; --i)
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barrier();
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} while (!(scc.cha_b_ctrl & 0x04)); /* wait for tx buf empty */
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for (i = uSEC; i > 0; --i)
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barrier();
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scc.cha_b_data = c;
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}
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static inline void mac_scca_out(char c)
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{
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int i;
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do {
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for (i = uSEC; i > 0; --i)
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barrier();
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} while (!(scc.cha_a_ctrl & 0x04)); /* wait for tx buf empty */
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for (i = uSEC; i > 0; --i)
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barrier();
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scc.cha_a_data = c;
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}
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static void mac_sccb_console_write(struct console *co, const char *str,
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unsigned int count)
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{
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while (count--) {
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if (*str == '\n')
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mac_sccb_out('\r');
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mac_sccb_out(*str++);
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}
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}
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static void mac_scca_console_write(struct console *co, const char *str,
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unsigned int count)
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{
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while (count--) {
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if (*str == '\n')
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mac_scca_out('\r');
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mac_scca_out(*str++);
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}
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}
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/* The following two functions do a quick'n'dirty initialization of the MFP or
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* SCC serial ports. They're used by the debugging interface, kgdb, and the
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* serial console code. */
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#define SCCB_WRITE(reg,val) \
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do { \
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int i; \
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scc.cha_b_ctrl = (reg); \
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for (i = uSEC; i > 0; --i) \
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barrier(); \
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scc.cha_b_ctrl = (val); \
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for (i = uSEC; i > 0; --i) \
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barrier(); \
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} while(0)
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#define SCCA_WRITE(reg,val) \
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do { \
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int i; \
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scc.cha_a_ctrl = (reg); \
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for (i = uSEC; i > 0; --i) \
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barrier(); \
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scc.cha_a_ctrl = (val); \
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for (i = uSEC; i > 0; --i) \
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barrier(); \
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} while(0)
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/* loops_per_jiffy isn't initialized yet, so we can't use udelay(). This does a
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* delay of ~ 60us. */
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/* Mac: loops_per_jiffy min. 19000 ^= .5 us; MFPDELAY was 0.6 us*/
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#define LONG_DELAY() \
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do { \
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int i; \
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for (i = 60*uSEC; i > 0; --i) \
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barrier(); \
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} while(0)
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static void __init mac_init_scc_port(int cflag, int port)
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{
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/*
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* baud rates: 1200, 1800, 2400, 4800, 9600, 19.2k, 38.4k, 57.6k, 115.2k
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*/
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static int clksrc_table[9] =
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/* reg 11: 0x50 = BRG, 0x00 = RTxC, 0x28 = TRxC */
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{ 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x00, 0x00 };
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static int clkmode_table[9] =
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/* reg 4: 0x40 = x16, 0x80 = x32, 0xc0 = x64 */
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{ 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0xc0, 0x80 };
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static int div_table[9] =
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/* reg12 (BRG low) */
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{ 94, 62, 46, 22, 10, 4, 1, 0, 0 };
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int baud = cflag & CBAUD;
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int clksrc, clkmode, div, reg3, reg5;
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if (cflag & CBAUDEX)
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baud += B38400;
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if (baud < B1200 || baud > B38400+2)
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baud = B9600; /* use default 9600bps for non-implemented rates */
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baud -= B1200; /* tables starts at 1200bps */
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clksrc = clksrc_table[baud];
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clkmode = clkmode_table[baud];
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div = div_table[baud];
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reg3 = (((cflag & CSIZE) == CS8) ? 0xc0 : 0x40);
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reg5 = (((cflag & CSIZE) == CS8) ? 0x60 : 0x20) | 0x82 /* assert DTR/RTS */;
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if (port == 1) {
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(void)scc.cha_b_ctrl; /* reset reg pointer */
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SCCB_WRITE(9, 0xc0); /* reset */
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LONG_DELAY(); /* extra delay after WR9 access */
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SCCB_WRITE(4, (cflag & PARENB) ? ((cflag & PARODD) ? 0x01 : 0x03) : 0 |
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0x04 /* 1 stopbit */ |
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clkmode);
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SCCB_WRITE(3, reg3);
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SCCB_WRITE(5, reg5);
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SCCB_WRITE(9, 0); /* no interrupts */
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LONG_DELAY(); /* extra delay after WR9 access */
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SCCB_WRITE(10, 0); /* NRZ mode */
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SCCB_WRITE(11, clksrc); /* main clock source */
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SCCB_WRITE(12, div); /* BRG value */
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SCCB_WRITE(13, 0); /* BRG high byte */
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SCCB_WRITE(14, 1);
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SCCB_WRITE(3, reg3 | 1);
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SCCB_WRITE(5, reg5 | 8);
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} else if (port == 0) {
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(void)scc.cha_a_ctrl; /* reset reg pointer */
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SCCA_WRITE(9, 0xc0); /* reset */
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LONG_DELAY(); /* extra delay after WR9 access */
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SCCA_WRITE(4, (cflag & PARENB) ? ((cflag & PARODD) ? 0x01 : 0x03) : 0 |
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0x04 /* 1 stopbit */ |
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clkmode);
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SCCA_WRITE(3, reg3);
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SCCA_WRITE(5, reg5);
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SCCA_WRITE(9, 0); /* no interrupts */
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LONG_DELAY(); /* extra delay after WR9 access */
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SCCA_WRITE(10, 0); /* NRZ mode */
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SCCA_WRITE(11, clksrc); /* main clock source */
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SCCA_WRITE(12, div); /* BRG value */
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SCCA_WRITE(13, 0); /* BRG high byte */
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SCCA_WRITE(14, 1);
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SCCA_WRITE(3, reg3 | 1);
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SCCA_WRITE(5, reg5 | 8);
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}
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}
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#endif /* DEBUG_SERIAL */
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static int __init mac_debug_setup(char *arg)
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{
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if (!MACH_IS_MAC)
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return 0;
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#ifdef DEBUG_SERIAL
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if (!strcmp(arg, "ser") || !strcmp(arg, "ser1")) {
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/* Mac modem port */
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mac_init_scc_port(B9600|CS8, 0);
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mac_console_driver.write = mac_scca_console_write;
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scc_port = 0;
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} else if (!strcmp(arg, "ser2")) {
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/* Mac printer port */
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mac_init_scc_port(B9600|CS8, 1);
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mac_console_driver.write = mac_sccb_console_write;
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scc_port = 1;
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}
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#endif
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#ifdef DEBUG_HEADS
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if (!strcmp(arg, "scn") || !strcmp(arg, "con")) {
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/* display, using head.S console routines */
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mac_console_driver.write = mac_debug_console_write;
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}
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#endif
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if (mac_console_driver.write)
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register_console(&mac_console_driver);
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return 0;
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}
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early_param("debug", mac_debug_setup);
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