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>
6 #include <linux/usb/ch9.h>
7 #include <linux/pci_regs.h>
8 #include <linux/pci_ids.h>
9 #include <linux/errno.h>
10 #include <asm/io.h>
11 #include <asm/processor.h>
12 #include <asm/fcntl.h>
13 #include <asm/setup.h>
14 #include <xen/hvc-console.h>
15 #include <asm/pci-direct.h>
16 #include <asm/fixmap.h>
17 #include <asm/mrst.h>
18 #include <asm/pgtable.h>
19 #include <linux/usb/ehci_def.h>
20
21 /* Simple VGA output */
22 #define VGABASE (__ISA_IO_base + 0xb8000)
23
24 static int max_ypos = 25, max_xpos = 80;
25 static int current_ypos = 25, current_xpos;
26
early_vga_write(struct console * con,const char * str,unsigned n)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_xpos*k+i)),
38 VGABASE + 2*(max_xpos*j + i));
39 }
40 }
41 for (i = 0; i < max_xpos; i++)
42 writew(0x720, VGABASE + 2*(max_xpos*j + i));
43 current_ypos = max_ypos-1;
44 }
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
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_xpos*current_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
early_serial_putc(unsigned char ch)95 static int early_serial_putc(unsigned char ch)
96 {
97 unsigned timeout = 0xffff;
98
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
early_serial_write(struct console * con,const char * s,unsigned n)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
early_serial_init(char * s)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;
129 if (!strncmp(s, "0x", 2)) {
130 early_serial_base = simple_strtoul(s, &e, 16);
131 } else {
132 static const int __initconst bases[] = { 0x3f8, 0x2f8 };
133
134 if (!strncmp(s, "ttyS", 4))
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
172 /* Direct interface for emergencies */
173 static struct console *early_console = &early_vga_console;
174 static int __initdata early_console_initialized;
175
early_printk(const char * fmt,...)176 asmlinkage void early_printk(const char *fmt, ...)
177 {
178 char buf[512];
179 int n;
180 va_list ap;
181
182 va_start(ap, fmt);
183 n = vscnprintf(buf, sizeof(buf), fmt, ap);
184 early_console->write(early_console, buf, n);
185 va_end(ap);
186 }
187
early_console_register(struct console * con,int keep_early)188 static inline void early_console_register(struct console *con, int keep_early)
189 {
190 if (early_console->index != -1) {
191 printk(KERN_CRIT "ERROR: earlyprintk= %s already used\n",
192 con->name);
193 return;
194 }
195 early_console = con;
196 if (keep_early)
197 early_console->flags &= ~CON_BOOT;
198 else
199 early_console->flags |= CON_BOOT;
200 register_console(early_console);
201 }
202
setup_early_printk(char * buf)203 static int __init setup_early_printk(char *buf)
204 {
205 int keep;
206
207 if (!buf)
208 return 0;
209
210 if (early_console_initialized)
211 return 0;
212 early_console_initialized = 1;
213
214 keep = (strstr(buf, "keep") != NULL);
215
216 while (*buf != '\0') {
217 if (!strncmp(buf, "serial", 6)) {
218 buf += 6;
219 early_serial_init(buf);
220 early_console_register(&early_serial_console, keep);
221 if (!strncmp(buf, ",ttyS", 5))
222 buf += 5;
223 }
224 if (!strncmp(buf, "ttyS", 4)) {
225 early_serial_init(buf + 4);
226 early_console_register(&early_serial_console, keep);
227 }
228 if (!strncmp(buf, "vga", 3) &&
229 boot_params.screen_info.orig_video_isVGA == 1) {
230 max_xpos = boot_params.screen_info.orig_video_cols;
231 max_ypos = boot_params.screen_info.orig_video_lines;
232 current_ypos = boot_params.screen_info.orig_y;
233 early_console_register(&early_vga_console, keep);
234 }
235 #ifdef CONFIG_EARLY_PRINTK_DBGP
236 if (!strncmp(buf, "dbgp", 4) && !early_dbgp_init(buf + 4))
237 early_console_register(&early_dbgp_console, keep);
238 #endif
239 #ifdef CONFIG_HVC_XEN
240 if (!strncmp(buf, "xen", 3))
241 early_console_register(&xenboot_console, keep);
242 #endif
243 #ifdef CONFIG_EARLY_PRINTK_INTEL_MID
244 if (!strncmp(buf, "mrst", 4)) {
245 mrst_early_console_init();
246 early_console_register(&early_mrst_console, keep);
247 }
248
249 if (!strncmp(buf, "hsu", 3)) {
250 hsu_early_console_init(buf + 3);
251 early_console_register(&early_hsu_console, keep);
252 }
253 #endif
254 buf++;
255 }
256 return 0;
257 }
258
259 early_param("earlyprintk", setup_early_printk);
260