[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / x86 / kernel / early_printk.c

#include <linux/console.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/screen_info.h>
#include <linux/usb/ch9.h>
#include <linux/pci_regs.h>
#include <linux/pci_ids.h>
#include <linux/errno.h>
#include <asm/io.h>
#include <asm/processor.h>
#include <asm/fcntl.h>
#include <asm/setup.h>
#include <xen/hvc-console.h>
#include <asm/pci-direct.h>
#include <asm/fixmap.h>
#include <asm/mrst.h>
#include <asm/pgtable.h>
#include <linux/usb/ehci_def.h>

/* Simple VGA output */
#define VGABASE		(__ISA_IO_base + 0xb8000)

static int max_ypos = 25, max_xpos = 80;
static int current_ypos = 25, current_xpos;

static void early_vga_write(struct console *con, const char *str, unsigned n)
{
	char c;
	int  i, k, j;

	while ((c = *str++) != '\0' && n-- > 0) {
		if (current_ypos >= max_ypos) {
			/* scroll 1 line up */
			for (k = 1, j = 0; k < max_ypos; k++, j++) {
				for (i = 0; i < max_xpos; i++) {
					writew(readw(VGABASE+2*(max_xpos*k+i)),
					       VGABASE + 2*(max_xpos*j + i));
				}
			}
			for (i = 0; i < max_xpos; i++)
				writew(0x720, VGABASE + 2*(max_xpos*j + i));
			current_ypos = max_ypos-1;
		}
#ifdef CONFIG_KGDB_KDB
		if (c == '\b') {
			if (current_xpos > 0)
				current_xpos--;
		} else if (c == '\r') {
			current_xpos = 0;
		} else
#endif
		if (c == '\n') {
			current_xpos = 0;
			current_ypos++;
		} else if (c != '\r')  {
			writew(((0x7 << 8) | (unsigned short) c),
			       VGABASE + 2*(max_xpos*current_ypos +
						current_xpos++));
			if (current_xpos >= max_xpos) {
				current_xpos = 0;
				current_ypos++;
			}
		}
	}
}

static struct console early_vga_console = {
	.name =		"earlyvga",
	.write =	early_vga_write,
	.flags =	CON_PRINTBUFFER,
	.index =	-1,
};

/* Serial functions loosely based on a similar package from Klaus P. Gerlicher */

static int early_serial_base = 0x3f8;  /* ttyS0 */

#define XMTRDY          0x20

#define DLAB		0x80

#define TXR             0       /*  Transmit register (WRITE) */
#define RXR             0       /*  Receive register  (READ)  */
#define IER             1       /*  Interrupt Enable          */
#define IIR             2       /*  Interrupt ID              */
#define FCR             2       /*  FIFO control              */
#define LCR             3       /*  Line control              */
#define MCR             4       /*  Modem control             */
#define LSR             5       /*  Line Status               */
#define MSR             6       /*  Modem Status              */
#define DLL             0       /*  Divisor Latch Low         */
#define DLH             1       /*  Divisor latch High        */

static int early_serial_putc(unsigned char ch)
{
	unsigned timeout = 0xffff;

	while ((inb(early_serial_base + LSR) & XMTRDY) == 0 && --timeout)
		cpu_relax();
	outb(ch, early_serial_base + TXR);
	return timeout ? 0 : -1;
}

static void early_serial_write(struct console *con, const char *s, unsigned n)
{
	while (*s && n-- > 0) {
		if (*s == '\n')
			early_serial_putc('\r');
		early_serial_putc(*s);
		s++;
	}
}

#define DEFAULT_BAUD 9600

static __init void early_serial_init(char *s)
{
	unsigned char c;
	unsigned divisor;
	unsigned baud = DEFAULT_BAUD;
	char *e;

	if (*s == ',')
		++s;

	if (*s) {
		unsigned port;
		if (!strncmp(s, "0x", 2)) {
			early_serial_base = simple_strtoul(s, &e, 16);
		} else {
			static const int __initconst bases[] = { 0x3f8, 0x2f8 };

			if (!strncmp(s, "ttyS", 4))
				s += 4;
			port = simple_strtoul(s, &e, 10);
			if (port > 1 || s == e)
				port = 0;
			early_serial_base = bases[port];
		}
		s += strcspn(s, ",");
		if (*s == ',')
			s++;
	}

	outb(0x3, early_serial_base + LCR);	/* 8n1 */
	outb(0, early_serial_base + IER);	/* no interrupt */
	outb(0, early_serial_base + FCR);	/* no fifo */
	outb(0x3, early_serial_base + MCR);	/* DTR + RTS */

	if (*s) {
		baud = simple_strtoul(s, &e, 0);
		if (baud == 0 || s == e)
			baud = DEFAULT_BAUD;
	}

	divisor = 115200 / baud;
	c = inb(early_serial_base + LCR);
	outb(c | DLAB, early_serial_base + LCR);
	outb(divisor & 0xff, early_serial_base + DLL);
	outb((divisor >> 8) & 0xff, early_serial_base + DLH);
	outb(c & ~DLAB, early_serial_base + LCR);
}

static struct console early_serial_console = {
	.name =		"earlyser",
	.write =	early_serial_write,
	.flags =	CON_PRINTBUFFER,
	.index =	-1,
};

static inline void early_console_register(struct console *con, int keep_early)
{
	if (con->index != -1) {
		printk(KERN_CRIT "ERROR: earlyprintk= %s already used\n",
		       con->name);
		return;
	}
	early_console = con;
	if (keep_early)
		early_console->flags &= ~CON_BOOT;
	else
		early_console->flags |= CON_BOOT;
	register_console(early_console);
}

static int __init setup_early_printk(char *buf)
{
	int keep;

	if (!buf)
		return 0;

	if (early_console)
		return 0;

	keep = (strstr(buf, "keep") != NULL);

	while (*buf != '\0') {
		if (!strncmp(buf, "serial", 6)) {
			buf += 6;
			early_serial_init(buf);
			early_console_register(&early_serial_console, keep);
			if (!strncmp(buf, ",ttyS", 5))
				buf += 5;
		}
		if (!strncmp(buf, "ttyS", 4)) {
			early_serial_init(buf + 4);
			early_console_register(&early_serial_console, keep);
		}
		if (!strncmp(buf, "vga", 3) &&
		    boot_params.screen_info.orig_video_isVGA == 1) {
			max_xpos = boot_params.screen_info.orig_video_cols;
			max_ypos = boot_params.screen_info.orig_video_lines;
			current_ypos = boot_params.screen_info.orig_y;
			early_console_register(&early_vga_console, keep);
		}
#ifdef CONFIG_EARLY_PRINTK_DBGP
		if (!strncmp(buf, "dbgp", 4) && !early_dbgp_init(buf + 4))
			early_console_register(&early_dbgp_console, keep);
#endif
#ifdef CONFIG_HVC_XEN
		if (!strncmp(buf, "xen", 3))
			early_console_register(&xenboot_console, keep);
#endif
#ifdef CONFIG_EARLY_PRINTK_INTEL_MID
		if (!strncmp(buf, "mrst", 4)) {
			mrst_early_console_init();
			early_console_register(&early_mrst_console, keep);
		}

		if (!strncmp(buf, "hsu", 3)) {
			hsu_early_console_init(buf + 3);
			early_console_register(&early_hsu_console, keep);
		}
#endif
		buf++;
	}
	return 0;
}

early_param("earlyprintk", setup_early_printk);
Commit	Line	Data
250c2277 TG	1	#include <linux/console.h>
	2	#include <linux/kernel.h>
	3	#include <linux/init.h>
	4	#include <linux/string.h>
	5	#include <linux/screen_info.h>
5c05917e YL	6	#include <linux/usb/ch9.h>
	7	#include <linux/pci_regs.h>
	8	#include <linux/pci_ids.h>
	9	#include <linux/errno.h>
250c2277 TG	10	#include <asm/io.h>
	11	#include <asm/processor.h>
	12	#include <asm/fcntl.h>
30c82645	13	#include <asm/setup.h>
250c2277	14	#include <xen/hvc-console.h>
5c05917e	15	#include <asm/pci-direct.h>
5c05917e	16	#include <asm/fixmap.h>
c20b5c33	17	#include <asm/mrst.h>
726c0d95	18	#include <asm/pgtable.h>
5c05917e	19	#include <linux/usb/ehci_def.h>
1da177e4	20
250c2277	21	/* Simple VGA output */
250c2277 TG	22	#define VGABASE (__ISA_IO_base + 0xb8000)
	23
	24	static int max_ypos = 25, max_xpos = 80;
c9cf39ae	25	static int current_ypos = 25, current_xpos;
250c2277 TG	26
	27	static void early_vga_write(struct console con, const char str, unsigned n)
	28	{
	29	char c;
	30	int i, k, j;
	31
	32	while ((c = *str++) != '\0' && n-- > 0) {
	33	if (current_ypos >= max_ypos) {
	34	/* scroll 1 line up */
	35	for (k = 1, j = 0; k < max_ypos; k++, j++) {
	36	for (i = 0; i < max_xpos; i++) {
	37	writew(readw(VGABASE+2(max_xposk+i)),
	38	VGABASE + 2(max_xposj + i));
	39	}
	40	}
	41	for (i = 0; i < max_xpos; i++)
	42	writew(0x720, VGABASE + 2(max_xposj + i));
	43	current_ypos = max_ypos-1;
	44	}
61eaf539 JW	45	#ifdef CONFIG_KGDB_KDB
	46	if (c == '\b') {
	47	if (current_xpos > 0)
	48	current_xpos--;
	49	} else if (c == '\r') {
	50	current_xpos = 0;
	51	} else
	52	#endif
250c2277 TG	53	if (c == '\n') {
	54	current_xpos = 0;
	55	current_ypos++;
	56	} else if (c != '\r') {
	57	writew(((0x7 << 8) \| (unsigned short) c),
	58	VGABASE + 2(max_xposcurrent_ypos +
	59	current_xpos++));
	60	if (current_xpos >= max_xpos) {
	61	current_xpos = 0;
	62	current_ypos++;
	63	}
	64	}
	65	}
	66	}
	67
	68	static struct console early_vga_console = {
	69	.name = "earlyvga",
	70	.write = early_vga_write,
	71	.flags = CON_PRINTBUFFER,
	72	.index = -1,
	73	};
	74
	75	/* Serial functions loosely based on a similar package from Klaus P. Gerlicher */
	76
	77	static int early_serial_base = 0x3f8; /* ttyS0 */
	78
	79	#define XMTRDY 0x20
	80
	81	#define DLAB 0x80
	82
	83	#define TXR 0 /* Transmit register (WRITE) */
	84	#define RXR 0 /* Receive register (READ) */
	85	#define IER 1 /* Interrupt Enable */
	86	#define IIR 2 /* Interrupt ID */
	87	#define FCR 2 /* FIFO control */
	88	#define LCR 3 /* Line control */
	89	#define MCR 4 /* Modem control */
	90	#define LSR 5 /* Line Status */
	91	#define MSR 6 /* Modem Status */
	92	#define DLL 0 /* Divisor Latch Low */
	93	#define DLH 1 /* Divisor latch High */
	94
	95	static int early_serial_putc(unsigned char ch)
	96	{
	97	unsigned timeout = 0xffff;
5c05917e	98
250c2277 TG	99	while ((inb(early_serial_base + LSR) & XMTRDY) == 0 && --timeout)
	100	cpu_relax();
	101	outb(ch, early_serial_base + TXR);
	102	return timeout ? 0 : -1;
	103	}
	104
	105	static void early_serial_write(struct console con, const char s, unsigned n)
	106	{
	107	while (*s && n-- > 0) {
	108	if (*s == '\n')
	109	early_serial_putc('\r');
	110	early_serial_putc(*s);
	111	s++;
	112	}
	113	}
	114
	115	#define DEFAULT_BAUD 9600
	116
	117	static __init void early_serial_init(char *s)
	118	{
	119	unsigned char c;
	120	unsigned divisor;
	121	unsigned baud = DEFAULT_BAUD;
	122	char *e;
	123
	124	if (*s == ',')
	125	++s;
	126
	127	if (*s) {
	128	unsigned port;
e941f27a	129	if (!strncmp(s, "0x", 2)) {
250c2277 TG	130	early_serial_base = simple_strtoul(s, &e, 16);
250c2277 TG	131	} else {
30cec979	132	static const int __initconst bases[] = { 0x3f8, 0x2f8 };
250c2277	133
e941f27a	134	if (!strncmp(s, "ttyS", 4))
250c2277 TG	135	s += 4;
	136	port = simple_strtoul(s, &e, 10);
	137	if (port > 1 \|\| s == e)
	138	port = 0;
	139	early_serial_base = bases[port];
	140	}
	141	s += strcspn(s, ",");
	142	if (*s == ',')
	143	s++;
	144	}
	145
	146	outb(0x3, early_serial_base + LCR); /* 8n1 */
	147	outb(0, early_serial_base + IER); /* no interrupt */
	148	outb(0, early_serial_base + FCR); /* no fifo */
	149	outb(0x3, early_serial_base + MCR); /* DTR + RTS */
	150
	151	if (*s) {
	152	baud = simple_strtoul(s, &e, 0);
	153	if (baud == 0 \|\| s == e)
	154	baud = DEFAULT_BAUD;
	155	}
	156
	157	divisor = 115200 / baud;
	158	c = inb(early_serial_base + LCR);
	159	outb(c \| DLAB, early_serial_base + LCR);
	160	outb(divisor & 0xff, early_serial_base + DLL);
	161	outb((divisor >> 8) & 0xff, early_serial_base + DLH);
	162	outb(c & ~DLAB, early_serial_base + LCR);
	163	}
	164
	165	static struct console early_serial_console = {
	166	.name = "earlyser",
	167	.write = early_serial_write,
	168	.flags = CON_PRINTBUFFER,
	169	.index = -1,
	170	};
	171
c9530948 JW	172	static inline void early_console_register(struct console *con, int keep_early)
c9530948 JW	173	{
d0380e6c	174	if (con->index != -1) {
429a6e5e JW	175	printk(KERN_CRIT "ERROR: earlyprintk= %s already used\n",
	176	con->name);
	177	return;
	178	}
c9530948 JW	179	early_console = con;
	180	if (keep_early)
	181	early_console->flags &= ~CON_BOOT;
	182	else
	183	early_console->flags \|= CON_BOOT;
	184	register_console(early_console);
	185	}
250c2277 TG	186
	187	static int __init setup_early_printk(char *buf)
	188	{
c9530948	189	int keep;
5c05917e	190
250c2277 TG	191	if (!buf)
	192	return 0;
	193
d0380e6c	194	if (early_console)
250c2277	195	return 0;
250c2277	196
c9530948 JW	197	keep = (strstr(buf, "keep") != NULL);
	198
	199	while (*buf != '\0') {
	200	if (!strncmp(buf, "serial", 6)) {
ea3acb19 JW	201	buf += 6;
ea3acb19 JW	202	early_serial_init(buf);
c9530948	203	early_console_register(&early_serial_console, keep);
ea3acb19 JW	204	if (!strncmp(buf, ",ttyS", 5))
ea3acb19 JW	205	buf += 5;
c9530948 JW	206	}
	207	if (!strncmp(buf, "ttyS", 4)) {
	208	early_serial_init(buf + 4);
	209	early_console_register(&early_serial_console, keep);
	210	}
	211	if (!strncmp(buf, "vga", 3) &&
	212	boot_params.screen_info.orig_video_isVGA == 1) {
	213	max_xpos = boot_params.screen_info.orig_video_cols;
	214	max_ypos = boot_params.screen_info.orig_video_lines;
	215	current_ypos = boot_params.screen_info.orig_y;
	216	early_console_register(&early_vga_console, keep);
	217	}
5c05917e	218	#ifdef CONFIG_EARLY_PRINTK_DBGP
c9530948 JW	219	if (!strncmp(buf, "dbgp", 4) && !early_dbgp_init(buf + 4))
c9530948 JW	220	early_console_register(&early_dbgp_console, keep);
5c05917e	221	#endif
250c2277	222	#ifdef CONFIG_HVC_XEN
c9530948 JW	223	if (!strncmp(buf, "xen", 3))
c9530948 JW	224	early_console_register(&xenboot_console, keep);
c20b5c33	225	#endif
1ea7c673	226	#ifdef CONFIG_EARLY_PRINTK_INTEL_MID
c20b5c33 FT	227	if (!strncmp(buf, "mrst", 4)) {
	228	mrst_early_console_init();
	229	early_console_register(&early_mrst_console, keep);
	230	}
4d033556 FT	231
4d033556 FT	232	if (!strncmp(buf, "hsu", 3)) {
b82e324b	233	hsu_early_console_init(buf + 3);
4d033556 FT	234	early_console_register(&early_hsu_console, keep);
4d033556 FT	235	}
250c2277	236	#endif
c9530948	237	buf++;
250c2277	238	}
250c2277 TG	239	return 0;
250c2277 TG	240	}
5c05917e	241
250c2277	242	early_param("earlyprintk", setup_early_printk);