patch-2.3.4 linux/arch/ppc/xmon/start.c

• Lines: 299
• Date: Wed May 26 16:55:40 1999
• Orig file: v2.3.3/linux/arch/ppc/xmon/start.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.3/linux/arch/ppc/xmon/start.c linux/arch/ppc/xmon/start.c
@@ -0,0 +1,298 @@
+/*
+ * Copyright (C) 1996 Paul Mackerras.
+ */
+#include <linux/string.h>
+#include <asm/machdep.h>
+#include <asm/io.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/adb.h>
+#include <asm/prom.h>
+
+static volatile unsigned char *sccc, *sccd;
+unsigned long TXRDY, RXRDY;
+extern void xmon_printf(const char *fmt, ...);
+
+static int console = 0;
+
+void buf_access(void)
+{
+	if ( _machine == _MACH_chrp )
+		sccd[3] &= ~0x80;	/* reset DLAB */
+}
+
+void
+xmon_map_scc(void)
+{
+	volatile unsigned char *base;
+
+	if ( _machine == _MACH_Pmac )
+	{
+		struct device_node *np;
+#ifdef CHRP_ESCC
+		unsigned long addr = 0xc1013020;
+#else
+		unsigned long addr = 0xf3013030;
+#endif
+		TXRDY = 4;
+		RXRDY = 1;
+		
+		np = find_devices("mac-io");
+		if (np && np->n_addrs) {
+			addr = np->addrs[0].address + 0x13000;
+			/* use the B channel on the iMac, A channel on others */
+			if (addr >= 0xf0000000)
+				addr += 0x20; /* use A channel */
+		}
+		base = (volatile unsigned char *) ioremap(addr & PAGE_MASK, PAGE_SIZE);
+		sccc = base + (addr & ~PAGE_MASK);
+#ifdef CHRP_ESCC
+		sccd = sccc + (0xc1013030 - 0xc1013020);
+#else
+		sccd = sccc + (0xf3013030 - 0xf3013020);
+#endif
+	}
+	else
+	{
+		/* should already be mapped by the kernel boot */
+		sccc = (volatile unsigned char *) (isa_io_base + 0x3fd);
+		sccd = (volatile unsigned char *) (isa_io_base + 0x3f8);
+		TXRDY = 0x20;
+		RXRDY = 1;
+	}
+}
+
+static int scc_initialized = 0;
+
+void xmon_init_scc(void);
+extern void pmu_poll(void);
+
+int
+xmon_write(void *handle, void *ptr, int nb)
+{
+    char *p = ptr;
+    int i, ct;
+
+    if (!scc_initialized)
+	xmon_init_scc();
+    for (i = 0; i < nb; ++i) {
+	while ((*sccc & TXRDY) == 0)
+	    if (adb_hardware == ADB_VIAPMU)
+		pmu_poll();
+	buf_access();
+	if ( console && (*p != '\r'))
+		printk("%c", *p);
+	ct = 0;
+	if ( *p == '\n')
+		ct = 1;
+	*sccd = *p++;
+	if ( ct )
+		xmon_write(handle, "\r", 1);
+    }
+    return i;
+}
+
+int
+xmon_read(void *handle, void *ptr, int nb)
+{
+    char *p = ptr;
+    int i;
+
+    if (!scc_initialized)
+	xmon_init_scc();
+    for (i = 0; i < nb; ++i) {
+	while ((*sccc & RXRDY) == 0)
+	    if (adb_hardware == ADB_VIAPMU)
+		pmu_poll();
+	buf_access();
+#if 0	
+	if ( 0/*console*/ )
+		*p++ = ppc_md.kbd_getkeycode();
+	else
+#endif		
+		*p++ = *sccd;
+    }
+    return i;
+}
+
+static unsigned char scc_inittab[] = {
+    13, 0,		/* set baud rate divisor */
+    12, 1,
+    14, 1,		/* baud rate gen enable, src=rtxc */
+    11, 0x50,		/* clocks = br gen */
+    5,  0x6a,		/* tx 8 bits, assert RTS */
+    4,  0x44,		/* x16 clock, 1 stop */
+    3,  0xc1,		/* rx enable, 8 bits */
+};
+
+void
+xmon_init_scc()
+{
+	if ( _machine == _MACH_chrp )
+	{
+		sccd[3] = 0x83; eieio();	/* LCR = 8N1 + DLAB */
+		sccd[0] = 3; eieio();		/* DLL = 38400 baud */
+		sccd[1] = 0; eieio();
+		sccd[2] = 0; eieio();		/* FCR = 0 */
+		sccd[3] = 3; eieio();		/* LCR = 8N1 */
+		sccd[1] = 0; eieio();		/* IER = 0 */
+	}
+	else
+	{
+		int i, x;
+
+		for (i = 20000; i != 0; --i) {
+			x = *sccc; eieio();
+		}
+		*sccc = 9; eieio();		/* reset A or B side */
+		*sccc = ((unsigned long)sccc & 0x20)? 0x80: 0x40; eieio();
+		for (i = 0; i < sizeof(scc_inittab); ++i) {
+			*sccc = scc_inittab[i];
+			eieio();
+		}
+	}
+	scc_initialized = 1;
+}
+
+#if 0
+extern int (*prom_entry)(void *);
+
+int
+xmon_exit(void)
+{
+    struct prom_args {
+	char *service;
+    } args;
+
+    for (;;) {
+	args.service = "exit";
+	(*prom_entry)(&args);
+    }
+}
+#endif
+
+void *xmon_stdin;
+void *xmon_stdout;
+void *xmon_stderr;
+
+void
+xmon_init(void)
+{
+}
+
+int
+xmon_putc(int c, void *f)
+{
+    char ch = c;
+
+    if (c == '\n')
+	xmon_putc('\r', f);
+    return xmon_write(f, &ch, 1) == 1? c: -1;
+}
+
+int
+xmon_putchar(int c)
+{
+    return xmon_putc(c, xmon_stdout);
+}
+
+int
+xmon_fputs(char *str, void *f)
+{
+    int n = strlen(str);
+
+    return xmon_write(f, str, n) == n? 0: -1;
+}
+
+int
+xmon_readchar(void)
+{
+    char ch;
+
+    for (;;) {
+	switch (xmon_read(xmon_stdin, &ch, 1)) {
+	case 1:
+	    return ch;
+	case -1:
+	    xmon_printf("read(stdin) returned -1\r\n", 0, 0);
+	    return -1;
+	}
+    }
+}
+
+static char line[256];
+static char *lineptr;
+static int lineleft;
+
+int
+xmon_getchar(void)
+{
+    int c;
+
+    if (lineleft == 0) {
+	lineptr = line;
+	for (;;) {
+	    c = xmon_readchar();
+	    if (c == -1 || c == 4)
+		break;
+	    if (c == '\r' || c == '\n') {
+		*lineptr++ = '\n';
+		xmon_putchar('\n');
+		break;
+	    }
+	    switch (c) {
+	    case 0177:
+	    case '\b':
+		if (lineptr > line) {
+		    xmon_putchar('\b');
+		    xmon_putchar(' ');
+		    xmon_putchar('\b');
+		    --lineptr;
+		}
+		break;
+	    case 'U' & 0x1F:
+		while (lineptr > line) {
+		    xmon_putchar('\b');
+		    xmon_putchar(' ');
+		    xmon_putchar('\b');
+		    --lineptr;
+		}
+		break;
+	    default:
+		if (lineptr >= &line[sizeof(line) - 1])
+		    xmon_putchar('\a');
+		else {
+		    xmon_putchar(c);
+		    *lineptr++ = c;
+		}
+	    }
+	}
+	lineleft = lineptr - line;
+	lineptr = line;
+    }
+    if (lineleft == 0)
+	return -1;
+    --lineleft;
+    return *lineptr++;
+}
+
+char *
+xmon_fgets(char *str, int nb, void *f)
+{
+    char *p;
+    int c;
+
+    for (p = str; p < str + nb - 1; ) {
+	c = xmon_getchar();
+	if (c == -1) {
+	    if (p == str)
+		return 0;
+	    break;
+	}
+	*p++ = c;
+	if (c == '\n')
+	    break;
+    }
+    *p = 0;
+    return str;
+}