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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
24static int max_ypos = 25, max_xpos = 80;
25static int current_ypos = 25, current_xpos;
26
27static 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
68static 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
77static 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
95static 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
105static 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
117static __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
165static 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 */
173static struct console *early_console = &early_vga_console;
174static int __initdata early_console_initialized;
175
176asmlinkage 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
188static 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
203static 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_MRST
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();
251 early_console_register(&early_hsu_console, keep);
252 }
253#endif
254 buf++;
255 }
256 return 0;
257}
258
259early_param("earlyprintk", setup_early_printk);
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/intel-mid.h>
18#include <asm/pgtable.h>
19#include <linux/usb/ehci_def.h>
20#include <linux/efi.h>
21#include <asm/efi.h>
22#include <asm/pci_x86.h>
23
24/* Simple VGA output */
25#define VGABASE (__ISA_IO_base + 0xb8000)
26
27static int max_ypos = 25, max_xpos = 80;
28static int current_ypos = 25, current_xpos;
29
30static void early_vga_write(struct console *con, const char *str, unsigned n)
31{
32 char c;
33 int i, k, j;
34
35 while ((c = *str++) != '\0' && n-- > 0) {
36 if (current_ypos >= max_ypos) {
37 /* scroll 1 line up */
38 for (k = 1, j = 0; k < max_ypos; k++, j++) {
39 for (i = 0; i < max_xpos; i++) {
40 writew(readw(VGABASE+2*(max_xpos*k+i)),
41 VGABASE + 2*(max_xpos*j + i));
42 }
43 }
44 for (i = 0; i < max_xpos; i++)
45 writew(0x720, VGABASE + 2*(max_xpos*j + i));
46 current_ypos = max_ypos-1;
47 }
48#ifdef CONFIG_KGDB_KDB
49 if (c == '\b') {
50 if (current_xpos > 0)
51 current_xpos--;
52 } else if (c == '\r') {
53 current_xpos = 0;
54 } else
55#endif
56 if (c == '\n') {
57 current_xpos = 0;
58 current_ypos++;
59 } else if (c != '\r') {
60 writew(((0x7 << 8) | (unsigned short) c),
61 VGABASE + 2*(max_xpos*current_ypos +
62 current_xpos++));
63 if (current_xpos >= max_xpos) {
64 current_xpos = 0;
65 current_ypos++;
66 }
67 }
68 }
69}
70
71static struct console early_vga_console = {
72 .name = "earlyvga",
73 .write = early_vga_write,
74 .flags = CON_PRINTBUFFER,
75 .index = -1,
76};
77
78/* Serial functions loosely based on a similar package from Klaus P. Gerlicher */
79
80static unsigned long early_serial_base = 0x3f8; /* ttyS0 */
81
82#define XMTRDY 0x20
83
84#define DLAB 0x80
85
86#define TXR 0 /* Transmit register (WRITE) */
87#define RXR 0 /* Receive register (READ) */
88#define IER 1 /* Interrupt Enable */
89#define IIR 2 /* Interrupt ID */
90#define FCR 2 /* FIFO control */
91#define LCR 3 /* Line control */
92#define MCR 4 /* Modem control */
93#define LSR 5 /* Line Status */
94#define MSR 6 /* Modem Status */
95#define DLL 0 /* Divisor Latch Low */
96#define DLH 1 /* Divisor latch High */
97
98static unsigned int io_serial_in(unsigned long addr, int offset)
99{
100 return inb(addr + offset);
101}
102
103static void io_serial_out(unsigned long addr, int offset, int value)
104{
105 outb(value, addr + offset);
106}
107
108static unsigned int (*serial_in)(unsigned long addr, int offset) = io_serial_in;
109static void (*serial_out)(unsigned long addr, int offset, int value) = io_serial_out;
110
111static int early_serial_putc(unsigned char ch)
112{
113 unsigned timeout = 0xffff;
114
115 while ((serial_in(early_serial_base, LSR) & XMTRDY) == 0 && --timeout)
116 cpu_relax();
117 serial_out(early_serial_base, TXR, ch);
118 return timeout ? 0 : -1;
119}
120
121static void early_serial_write(struct console *con, const char *s, unsigned n)
122{
123 while (*s && n-- > 0) {
124 if (*s == '\n')
125 early_serial_putc('\r');
126 early_serial_putc(*s);
127 s++;
128 }
129}
130
131static __init void early_serial_hw_init(unsigned divisor)
132{
133 unsigned char c;
134
135 serial_out(early_serial_base, LCR, 0x3); /* 8n1 */
136 serial_out(early_serial_base, IER, 0); /* no interrupt */
137 serial_out(early_serial_base, FCR, 0); /* no fifo */
138 serial_out(early_serial_base, MCR, 0x3); /* DTR + RTS */
139
140 c = serial_in(early_serial_base, LCR);
141 serial_out(early_serial_base, LCR, c | DLAB);
142 serial_out(early_serial_base, DLL, divisor & 0xff);
143 serial_out(early_serial_base, DLH, (divisor >> 8) & 0xff);
144 serial_out(early_serial_base, LCR, c & ~DLAB);
145}
146
147#define DEFAULT_BAUD 9600
148
149static __init void early_serial_init(char *s)
150{
151 unsigned divisor;
152 unsigned long baud = DEFAULT_BAUD;
153 char *e;
154
155 if (*s == ',')
156 ++s;
157
158 if (*s) {
159 unsigned port;
160 if (!strncmp(s, "0x", 2)) {
161 early_serial_base = simple_strtoul(s, &e, 16);
162 } else {
163 static const int __initconst bases[] = { 0x3f8, 0x2f8 };
164
165 if (!strncmp(s, "ttyS", 4))
166 s += 4;
167 port = simple_strtoul(s, &e, 10);
168 if (port > 1 || s == e)
169 port = 0;
170 early_serial_base = bases[port];
171 }
172 s += strcspn(s, ",");
173 if (*s == ',')
174 s++;
175 }
176
177 if (*s) {
178 baud = simple_strtoull(s, &e, 0);
179
180 if (baud == 0 || s == e)
181 baud = DEFAULT_BAUD;
182 }
183
184 /* Convert from baud to divisor value */
185 divisor = 115200 / baud;
186
187 /* These will always be IO based ports */
188 serial_in = io_serial_in;
189 serial_out = io_serial_out;
190
191 /* Set up the HW */
192 early_serial_hw_init(divisor);
193}
194
195#ifdef CONFIG_PCI
196static void mem32_serial_out(unsigned long addr, int offset, int value)
197{
198 u32 __iomem *vaddr = (u32 __iomem *)addr;
199 /* shift implied by pointer type */
200 writel(value, vaddr + offset);
201}
202
203static unsigned int mem32_serial_in(unsigned long addr, int offset)
204{
205 u32 __iomem *vaddr = (u32 __iomem *)addr;
206 /* shift implied by pointer type */
207 return readl(vaddr + offset);
208}
209
210/*
211 * early_pci_serial_init()
212 *
213 * This function is invoked when the early_printk param starts with "pciserial"
214 * The rest of the param should be ",B:D.F,baud" where B, D & F describe the
215 * location of a PCI device that must be a UART device.
216 */
217static __init void early_pci_serial_init(char *s)
218{
219 unsigned divisor;
220 unsigned long baud = DEFAULT_BAUD;
221 u8 bus, slot, func;
222 u32 classcode, bar0;
223 u16 cmdreg;
224 char *e;
225
226
227 /*
228 * First, part the param to get the BDF values
229 */
230 if (*s == ',')
231 ++s;
232
233 if (*s == 0)
234 return;
235
236 bus = (u8)simple_strtoul(s, &e, 16);
237 s = e;
238 if (*s != ':')
239 return;
240 ++s;
241 slot = (u8)simple_strtoul(s, &e, 16);
242 s = e;
243 if (*s != '.')
244 return;
245 ++s;
246 func = (u8)simple_strtoul(s, &e, 16);
247 s = e;
248
249 /* A baud might be following */
250 if (*s == ',')
251 s++;
252
253 /*
254 * Second, find the device from the BDF
255 */
256 cmdreg = read_pci_config(bus, slot, func, PCI_COMMAND);
257 classcode = read_pci_config(bus, slot, func, PCI_CLASS_REVISION);
258 bar0 = read_pci_config(bus, slot, func, PCI_BASE_ADDRESS_0);
259
260 /*
261 * Verify it is a UART type device
262 */
263 if (((classcode >> 16 != PCI_CLASS_COMMUNICATION_MODEM) &&
264 (classcode >> 16 != PCI_CLASS_COMMUNICATION_SERIAL)) ||
265 (((classcode >> 8) & 0xff) != 0x02)) /* 16550 I/F at BAR0 */
266 return;
267
268 /*
269 * Determine if it is IO or memory mapped
270 */
271 if (bar0 & 0x01) {
272 /* it is IO mapped */
273 serial_in = io_serial_in;
274 serial_out = io_serial_out;
275 early_serial_base = bar0&0xfffffffc;
276 write_pci_config(bus, slot, func, PCI_COMMAND,
277 cmdreg|PCI_COMMAND_IO);
278 } else {
279 /* It is memory mapped - assume 32-bit alignment */
280 serial_in = mem32_serial_in;
281 serial_out = mem32_serial_out;
282 /* WARNING! assuming the address is always in the first 4G */
283 early_serial_base =
284 (unsigned long)early_ioremap(bar0 & 0xfffffff0, 0x10);
285 write_pci_config(bus, slot, func, PCI_COMMAND,
286 cmdreg|PCI_COMMAND_MEMORY);
287 }
288
289 /*
290 * Lastly, initialize the hardware
291 */
292 if (*s) {
293 if (strcmp(s, "nocfg") == 0)
294 /* Sometimes, we want to leave the UART alone
295 * and assume the BIOS has set it up correctly.
296 * "nocfg" tells us this is the case, and we
297 * should do no more setup.
298 */
299 return;
300 if (kstrtoul(s, 0, &baud) < 0 || baud == 0)
301 baud = DEFAULT_BAUD;
302 }
303
304 /* Convert from baud to divisor value */
305 divisor = 115200 / baud;
306
307 /* Set up the HW */
308 early_serial_hw_init(divisor);
309}
310#endif
311
312static struct console early_serial_console = {
313 .name = "earlyser",
314 .write = early_serial_write,
315 .flags = CON_PRINTBUFFER,
316 .index = -1,
317};
318
319static void early_console_register(struct console *con, int keep_early)
320{
321 if (con->index != -1) {
322 printk(KERN_CRIT "ERROR: earlyprintk= %s already used\n",
323 con->name);
324 return;
325 }
326 early_console = con;
327 if (keep_early)
328 early_console->flags &= ~CON_BOOT;
329 else
330 early_console->flags |= CON_BOOT;
331 register_console(early_console);
332}
333
334static int __init setup_early_printk(char *buf)
335{
336 int keep;
337
338 if (!buf)
339 return 0;
340
341 if (early_console)
342 return 0;
343
344 keep = (strstr(buf, "keep") != NULL);
345
346 while (*buf != '\0') {
347 if (!strncmp(buf, "serial", 6)) {
348 buf += 6;
349 early_serial_init(buf);
350 early_console_register(&early_serial_console, keep);
351 if (!strncmp(buf, ",ttyS", 5))
352 buf += 5;
353 }
354 if (!strncmp(buf, "ttyS", 4)) {
355 early_serial_init(buf + 4);
356 early_console_register(&early_serial_console, keep);
357 }
358#ifdef CONFIG_PCI
359 if (!strncmp(buf, "pciserial", 9)) {
360 early_pci_serial_init(buf + 9);
361 early_console_register(&early_serial_console, keep);
362 buf += 9; /* Keep from match the above "serial" */
363 }
364#endif
365 if (!strncmp(buf, "vga", 3) &&
366 boot_params.screen_info.orig_video_isVGA == 1) {
367 max_xpos = boot_params.screen_info.orig_video_cols;
368 max_ypos = boot_params.screen_info.orig_video_lines;
369 current_ypos = boot_params.screen_info.orig_y;
370 early_console_register(&early_vga_console, keep);
371 }
372#ifdef CONFIG_EARLY_PRINTK_DBGP
373 if (!strncmp(buf, "dbgp", 4) && !early_dbgp_init(buf + 4))
374 early_console_register(&early_dbgp_console, keep);
375#endif
376#ifdef CONFIG_HVC_XEN
377 if (!strncmp(buf, "xen", 3))
378 early_console_register(&xenboot_console, keep);
379#endif
380#ifdef CONFIG_EARLY_PRINTK_EFI
381 if (!strncmp(buf, "efi", 3))
382 early_console_register(&early_efi_console, keep);
383#endif
384
385 buf++;
386 }
387 return 0;
388}
389
390early_param("earlyprintk", setup_early_printk);