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1// SPDX-License-Identifier: GPL-2.0
2#include <linux/console.h>
3#include <linux/kernel.h>
4#include <linux/init.h>
5#include <linux/string.h>
6#include <linux/screen_info.h>
7#include <linux/usb/ch9.h>
8#include <linux/pci_regs.h>
9#include <linux/pci_ids.h>
10#include <linux/errno.h>
11#include <asm/io.h>
12#include <asm/processor.h>
13#include <asm/fcntl.h>
14#include <asm/setup.h>
15#include <xen/hvc-console.h>
16#include <asm/pci-direct.h>
17#include <asm/fixmap.h>
18#include <asm/intel-mid.h>
19#include <asm/pgtable.h>
20#include <linux/usb/ehci_def.h>
21#include <linux/usb/xhci-dbgp.h>
22#include <linux/efi.h>
23#include <asm/efi.h>
24#include <asm/pci_x86.h>
25
26/* Simple VGA output */
27#define VGABASE (__ISA_IO_base + 0xb8000)
28
29static int max_ypos = 25, max_xpos = 80;
30static int current_ypos = 25, current_xpos;
31
32static void early_vga_write(struct console *con, const char *str, unsigned n)
33{
34 char c;
35 int i, k, j;
36
37 while ((c = *str++) != '\0' && n-- > 0) {
38 if (current_ypos >= max_ypos) {
39 /* scroll 1 line up */
40 for (k = 1, j = 0; k < max_ypos; k++, j++) {
41 for (i = 0; i < max_xpos; i++) {
42 writew(readw(VGABASE+2*(max_xpos*k+i)),
43 VGABASE + 2*(max_xpos*j + i));
44 }
45 }
46 for (i = 0; i < max_xpos; i++)
47 writew(0x720, VGABASE + 2*(max_xpos*j + i));
48 current_ypos = max_ypos-1;
49 }
50#ifdef CONFIG_KGDB_KDB
51 if (c == '\b') {
52 if (current_xpos > 0)
53 current_xpos--;
54 } else if (c == '\r') {
55 current_xpos = 0;
56 } else
57#endif
58 if (c == '\n') {
59 current_xpos = 0;
60 current_ypos++;
61 } else if (c != '\r') {
62 writew(((0x7 << 8) | (unsigned short) c),
63 VGABASE + 2*(max_xpos*current_ypos +
64 current_xpos++));
65 if (current_xpos >= max_xpos) {
66 current_xpos = 0;
67 current_ypos++;
68 }
69 }
70 }
71}
72
73static struct console early_vga_console = {
74 .name = "earlyvga",
75 .write = early_vga_write,
76 .flags = CON_PRINTBUFFER,
77 .index = -1,
78};
79
80/* Serial functions loosely based on a similar package from Klaus P. Gerlicher */
81
82static unsigned long early_serial_base = 0x3f8; /* ttyS0 */
83
84#define XMTRDY 0x20
85
86#define DLAB 0x80
87
88#define TXR 0 /* Transmit register (WRITE) */
89#define RXR 0 /* Receive register (READ) */
90#define IER 1 /* Interrupt Enable */
91#define IIR 2 /* Interrupt ID */
92#define FCR 2 /* FIFO control */
93#define LCR 3 /* Line control */
94#define MCR 4 /* Modem control */
95#define LSR 5 /* Line Status */
96#define MSR 6 /* Modem Status */
97#define DLL 0 /* Divisor Latch Low */
98#define DLH 1 /* Divisor latch High */
99
100static unsigned int io_serial_in(unsigned long addr, int offset)
101{
102 return inb(addr + offset);
103}
104
105static void io_serial_out(unsigned long addr, int offset, int value)
106{
107 outb(value, addr + offset);
108}
109
110static unsigned int (*serial_in)(unsigned long addr, int offset) = io_serial_in;
111static void (*serial_out)(unsigned long addr, int offset, int value) = io_serial_out;
112
113static int early_serial_putc(unsigned char ch)
114{
115 unsigned timeout = 0xffff;
116
117 while ((serial_in(early_serial_base, LSR) & XMTRDY) == 0 && --timeout)
118 cpu_relax();
119 serial_out(early_serial_base, TXR, ch);
120 return timeout ? 0 : -1;
121}
122
123static void early_serial_write(struct console *con, const char *s, unsigned n)
124{
125 while (*s && n-- > 0) {
126 if (*s == '\n')
127 early_serial_putc('\r');
128 early_serial_putc(*s);
129 s++;
130 }
131}
132
133static __init void early_serial_hw_init(unsigned divisor)
134{
135 unsigned char c;
136
137 serial_out(early_serial_base, LCR, 0x3); /* 8n1 */
138 serial_out(early_serial_base, IER, 0); /* no interrupt */
139 serial_out(early_serial_base, FCR, 0); /* no fifo */
140 serial_out(early_serial_base, MCR, 0x3); /* DTR + RTS */
141
142 c = serial_in(early_serial_base, LCR);
143 serial_out(early_serial_base, LCR, c | DLAB);
144 serial_out(early_serial_base, DLL, divisor & 0xff);
145 serial_out(early_serial_base, DLH, (divisor >> 8) & 0xff);
146 serial_out(early_serial_base, LCR, c & ~DLAB);
147}
148
149#define DEFAULT_BAUD 9600
150
151static __init void early_serial_init(char *s)
152{
153 unsigned divisor;
154 unsigned long baud = DEFAULT_BAUD;
155 char *e;
156
157 if (*s == ',')
158 ++s;
159
160 if (*s) {
161 unsigned port;
162 if (!strncmp(s, "0x", 2)) {
163 early_serial_base = simple_strtoul(s, &e, 16);
164 } else {
165 static const int __initconst bases[] = { 0x3f8, 0x2f8 };
166
167 if (!strncmp(s, "ttyS", 4))
168 s += 4;
169 port = simple_strtoul(s, &e, 10);
170 if (port > 1 || s == e)
171 port = 0;
172 early_serial_base = bases[port];
173 }
174 s += strcspn(s, ",");
175 if (*s == ',')
176 s++;
177 }
178
179 if (*s) {
180 baud = simple_strtoull(s, &e, 0);
181
182 if (baud == 0 || s == e)
183 baud = DEFAULT_BAUD;
184 }
185
186 /* Convert from baud to divisor value */
187 divisor = 115200 / baud;
188
189 /* These will always be IO based ports */
190 serial_in = io_serial_in;
191 serial_out = io_serial_out;
192
193 /* Set up the HW */
194 early_serial_hw_init(divisor);
195}
196
197#ifdef CONFIG_PCI
198static void mem32_serial_out(unsigned long addr, int offset, int value)
199{
200 u32 __iomem *vaddr = (u32 __iomem *)addr;
201 /* shift implied by pointer type */
202 writel(value, vaddr + offset);
203}
204
205static unsigned int mem32_serial_in(unsigned long addr, int offset)
206{
207 u32 __iomem *vaddr = (u32 __iomem *)addr;
208 /* shift implied by pointer type */
209 return readl(vaddr + offset);
210}
211
212/*
213 * early_pci_serial_init()
214 *
215 * This function is invoked when the early_printk param starts with "pciserial"
216 * The rest of the param should be ",B:D.F,baud" where B, D & F describe the
217 * location of a PCI device that must be a UART device.
218 */
219static __init void early_pci_serial_init(char *s)
220{
221 unsigned divisor;
222 unsigned long baud = DEFAULT_BAUD;
223 u8 bus, slot, func;
224 u32 classcode, bar0;
225 u16 cmdreg;
226 char *e;
227
228
229 /*
230 * First, part the param to get the BDF values
231 */
232 if (*s == ',')
233 ++s;
234
235 if (*s == 0)
236 return;
237
238 bus = (u8)simple_strtoul(s, &e, 16);
239 s = e;
240 if (*s != ':')
241 return;
242 ++s;
243 slot = (u8)simple_strtoul(s, &e, 16);
244 s = e;
245 if (*s != '.')
246 return;
247 ++s;
248 func = (u8)simple_strtoul(s, &e, 16);
249 s = e;
250
251 /* A baud might be following */
252 if (*s == ',')
253 s++;
254
255 /*
256 * Second, find the device from the BDF
257 */
258 cmdreg = read_pci_config(bus, slot, func, PCI_COMMAND);
259 classcode = read_pci_config(bus, slot, func, PCI_CLASS_REVISION);
260 bar0 = read_pci_config(bus, slot, func, PCI_BASE_ADDRESS_0);
261
262 /*
263 * Verify it is a UART type device
264 */
265 if (((classcode >> 16 != PCI_CLASS_COMMUNICATION_MODEM) &&
266 (classcode >> 16 != PCI_CLASS_COMMUNICATION_SERIAL)) ||
267 (((classcode >> 8) & 0xff) != 0x02)) /* 16550 I/F at BAR0 */
268 return;
269
270 /*
271 * Determine if it is IO or memory mapped
272 */
273 if (bar0 & 0x01) {
274 /* it is IO mapped */
275 serial_in = io_serial_in;
276 serial_out = io_serial_out;
277 early_serial_base = bar0&0xfffffffc;
278 write_pci_config(bus, slot, func, PCI_COMMAND,
279 cmdreg|PCI_COMMAND_IO);
280 } else {
281 /* It is memory mapped - assume 32-bit alignment */
282 serial_in = mem32_serial_in;
283 serial_out = mem32_serial_out;
284 /* WARNING! assuming the address is always in the first 4G */
285 early_serial_base =
286 (unsigned long)early_ioremap(bar0 & 0xfffffff0, 0x10);
287 write_pci_config(bus, slot, func, PCI_COMMAND,
288 cmdreg|PCI_COMMAND_MEMORY);
289 }
290
291 /*
292 * Lastly, initialize the hardware
293 */
294 if (*s) {
295 if (strcmp(s, "nocfg") == 0)
296 /* Sometimes, we want to leave the UART alone
297 * and assume the BIOS has set it up correctly.
298 * "nocfg" tells us this is the case, and we
299 * should do no more setup.
300 */
301 return;
302 if (kstrtoul(s, 0, &baud) < 0 || baud == 0)
303 baud = DEFAULT_BAUD;
304 }
305
306 /* Convert from baud to divisor value */
307 divisor = 115200 / baud;
308
309 /* Set up the HW */
310 early_serial_hw_init(divisor);
311}
312#endif
313
314static struct console early_serial_console = {
315 .name = "earlyser",
316 .write = early_serial_write,
317 .flags = CON_PRINTBUFFER,
318 .index = -1,
319};
320
321static void early_console_register(struct console *con, int keep_early)
322{
323 if (con->index != -1) {
324 printk(KERN_CRIT "ERROR: earlyprintk= %s already used\n",
325 con->name);
326 return;
327 }
328 early_console = con;
329 if (keep_early)
330 early_console->flags &= ~CON_BOOT;
331 else
332 early_console->flags |= CON_BOOT;
333 register_console(early_console);
334}
335
336static int __init setup_early_printk(char *buf)
337{
338 int keep;
339
340 if (!buf)
341 return 0;
342
343 if (early_console)
344 return 0;
345
346 keep = (strstr(buf, "keep") != NULL);
347
348 while (*buf != '\0') {
349 if (!strncmp(buf, "serial", 6)) {
350 buf += 6;
351 early_serial_init(buf);
352 early_console_register(&early_serial_console, keep);
353 if (!strncmp(buf, ",ttyS", 5))
354 buf += 5;
355 }
356 if (!strncmp(buf, "ttyS", 4)) {
357 early_serial_init(buf + 4);
358 early_console_register(&early_serial_console, keep);
359 }
360#ifdef CONFIG_PCI
361 if (!strncmp(buf, "pciserial", 9)) {
362 early_pci_serial_init(buf + 9);
363 early_console_register(&early_serial_console, keep);
364 buf += 9; /* Keep from match the above "serial" */
365 }
366#endif
367 if (!strncmp(buf, "vga", 3) &&
368 boot_params.screen_info.orig_video_isVGA == 1) {
369 max_xpos = boot_params.screen_info.orig_video_cols;
370 max_ypos = boot_params.screen_info.orig_video_lines;
371 current_ypos = boot_params.screen_info.orig_y;
372 early_console_register(&early_vga_console, keep);
373 }
374#ifdef CONFIG_EARLY_PRINTK_DBGP
375 if (!strncmp(buf, "dbgp", 4) && !early_dbgp_init(buf + 4))
376 early_console_register(&early_dbgp_console, keep);
377#endif
378#ifdef CONFIG_HVC_XEN
379 if (!strncmp(buf, "xen", 3))
380 early_console_register(&xenboot_console, keep);
381#endif
382#ifdef CONFIG_EARLY_PRINTK_EFI
383 if (!strncmp(buf, "efi", 3))
384 early_console_register(&early_efi_console, keep);
385#endif
386#ifdef CONFIG_EARLY_PRINTK_USB_XDBC
387 if (!strncmp(buf, "xdbc", 4))
388 early_xdbc_parse_parameter(buf + 4);
389#endif
390
391 buf++;
392 }
393 return 0;
394}
395
396early_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
23/* Simple VGA output */
24#define VGABASE (__ISA_IO_base + 0xb8000)
25
26static int max_ypos = 25, max_xpos = 80;
27static int current_ypos = 25, current_xpos;
28
29static void early_vga_write(struct console *con, const char *str, unsigned n)
30{
31 char c;
32 int i, k, j;
33
34 while ((c = *str++) != '\0' && n-- > 0) {
35 if (current_ypos >= max_ypos) {
36 /* scroll 1 line up */
37 for (k = 1, j = 0; k < max_ypos; k++, j++) {
38 for (i = 0; i < max_xpos; i++) {
39 writew(readw(VGABASE+2*(max_xpos*k+i)),
40 VGABASE + 2*(max_xpos*j + i));
41 }
42 }
43 for (i = 0; i < max_xpos; i++)
44 writew(0x720, VGABASE + 2*(max_xpos*j + i));
45 current_ypos = max_ypos-1;
46 }
47#ifdef CONFIG_KGDB_KDB
48 if (c == '\b') {
49 if (current_xpos > 0)
50 current_xpos--;
51 } else if (c == '\r') {
52 current_xpos = 0;
53 } else
54#endif
55 if (c == '\n') {
56 current_xpos = 0;
57 current_ypos++;
58 } else if (c != '\r') {
59 writew(((0x7 << 8) | (unsigned short) c),
60 VGABASE + 2*(max_xpos*current_ypos +
61 current_xpos++));
62 if (current_xpos >= max_xpos) {
63 current_xpos = 0;
64 current_ypos++;
65 }
66 }
67 }
68}
69
70static struct console early_vga_console = {
71 .name = "earlyvga",
72 .write = early_vga_write,
73 .flags = CON_PRINTBUFFER,
74 .index = -1,
75};
76
77/* Serial functions loosely based on a similar package from Klaus P. Gerlicher */
78
79static int early_serial_base = 0x3f8; /* ttyS0 */
80
81#define XMTRDY 0x20
82
83#define DLAB 0x80
84
85#define TXR 0 /* Transmit register (WRITE) */
86#define RXR 0 /* Receive register (READ) */
87#define IER 1 /* Interrupt Enable */
88#define IIR 2 /* Interrupt ID */
89#define FCR 2 /* FIFO control */
90#define LCR 3 /* Line control */
91#define MCR 4 /* Modem control */
92#define LSR 5 /* Line Status */
93#define MSR 6 /* Modem Status */
94#define DLL 0 /* Divisor Latch Low */
95#define DLH 1 /* Divisor latch High */
96
97static int early_serial_putc(unsigned char ch)
98{
99 unsigned timeout = 0xffff;
100
101 while ((inb(early_serial_base + LSR) & XMTRDY) == 0 && --timeout)
102 cpu_relax();
103 outb(ch, early_serial_base + TXR);
104 return timeout ? 0 : -1;
105}
106
107static void early_serial_write(struct console *con, const char *s, unsigned n)
108{
109 while (*s && n-- > 0) {
110 if (*s == '\n')
111 early_serial_putc('\r');
112 early_serial_putc(*s);
113 s++;
114 }
115}
116
117#define DEFAULT_BAUD 9600
118
119static __init void early_serial_init(char *s)
120{
121 unsigned char c;
122 unsigned divisor;
123 unsigned baud = DEFAULT_BAUD;
124 char *e;
125
126 if (*s == ',')
127 ++s;
128
129 if (*s) {
130 unsigned port;
131 if (!strncmp(s, "0x", 2)) {
132 early_serial_base = simple_strtoul(s, &e, 16);
133 } else {
134 static const int __initconst bases[] = { 0x3f8, 0x2f8 };
135
136 if (!strncmp(s, "ttyS", 4))
137 s += 4;
138 port = simple_strtoul(s, &e, 10);
139 if (port > 1 || s == e)
140 port = 0;
141 early_serial_base = bases[port];
142 }
143 s += strcspn(s, ",");
144 if (*s == ',')
145 s++;
146 }
147
148 outb(0x3, early_serial_base + LCR); /* 8n1 */
149 outb(0, early_serial_base + IER); /* no interrupt */
150 outb(0, early_serial_base + FCR); /* no fifo */
151 outb(0x3, early_serial_base + MCR); /* DTR + RTS */
152
153 if (*s) {
154 baud = simple_strtoul(s, &e, 0);
155 if (baud == 0 || s == e)
156 baud = DEFAULT_BAUD;
157 }
158
159 divisor = 115200 / baud;
160 c = inb(early_serial_base + LCR);
161 outb(c | DLAB, early_serial_base + LCR);
162 outb(divisor & 0xff, early_serial_base + DLL);
163 outb((divisor >> 8) & 0xff, early_serial_base + DLH);
164 outb(c & ~DLAB, early_serial_base + LCR);
165}
166
167static struct console early_serial_console = {
168 .name = "earlyser",
169 .write = early_serial_write,
170 .flags = CON_PRINTBUFFER,
171 .index = -1,
172};
173
174static inline void early_console_register(struct console *con, int keep_early)
175{
176 if (con->index != -1) {
177 printk(KERN_CRIT "ERROR: earlyprintk= %s already used\n",
178 con->name);
179 return;
180 }
181 early_console = con;
182 if (keep_early)
183 early_console->flags &= ~CON_BOOT;
184 else
185 early_console->flags |= CON_BOOT;
186 register_console(early_console);
187}
188
189static int __init setup_early_printk(char *buf)
190{
191 int keep;
192
193 if (!buf)
194 return 0;
195
196 if (early_console)
197 return 0;
198
199 keep = (strstr(buf, "keep") != NULL);
200
201 while (*buf != '\0') {
202 if (!strncmp(buf, "serial", 6)) {
203 buf += 6;
204 early_serial_init(buf);
205 early_console_register(&early_serial_console, keep);
206 if (!strncmp(buf, ",ttyS", 5))
207 buf += 5;
208 }
209 if (!strncmp(buf, "ttyS", 4)) {
210 early_serial_init(buf + 4);
211 early_console_register(&early_serial_console, keep);
212 }
213 if (!strncmp(buf, "vga", 3) &&
214 boot_params.screen_info.orig_video_isVGA == 1) {
215 max_xpos = boot_params.screen_info.orig_video_cols;
216 max_ypos = boot_params.screen_info.orig_video_lines;
217 current_ypos = boot_params.screen_info.orig_y;
218 early_console_register(&early_vga_console, keep);
219 }
220#ifdef CONFIG_EARLY_PRINTK_DBGP
221 if (!strncmp(buf, "dbgp", 4) && !early_dbgp_init(buf + 4))
222 early_console_register(&early_dbgp_console, keep);
223#endif
224#ifdef CONFIG_HVC_XEN
225 if (!strncmp(buf, "xen", 3))
226 early_console_register(&xenboot_console, keep);
227#endif
228#ifdef CONFIG_EARLY_PRINTK_INTEL_MID
229 if (!strncmp(buf, "mrst", 4)) {
230 mrst_early_console_init();
231 early_console_register(&early_mrst_console, keep);
232 }
233
234 if (!strncmp(buf, "hsu", 3)) {
235 hsu_early_console_init(buf + 3);
236 early_console_register(&early_hsu_console, keep);
237 }
238#endif
239#ifdef CONFIG_EARLY_PRINTK_EFI
240 if (!strncmp(buf, "efi", 3))
241 early_console_register(&early_efi_console, keep);
242#endif
243
244 buf++;
245 }
246 return 0;
247}
248
249early_param("earlyprintk", setup_early_printk);