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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
250c2277 TG |
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> | |
5c05917e YL |
7 | #include <linux/usb/ch9.h> |
8 | #include <linux/pci_regs.h> | |
9 | #include <linux/pci_ids.h> | |
10 | #include <linux/errno.h> | |
65fddcfc | 11 | #include <linux/pgtable.h> |
250c2277 TG |
12 | #include <asm/io.h> |
13 | #include <asm/processor.h> | |
14 | #include <asm/fcntl.h> | |
30c82645 | 15 | #include <asm/setup.h> |
250c2277 | 16 | #include <xen/hvc-console.h> |
5c05917e | 17 | #include <asm/pci-direct.h> |
5c05917e YL |
18 | #include <asm/fixmap.h> |
19 | #include <linux/usb/ehci_def.h> | |
1b5aeebf | 20 | #include <linux/usb/xhci-dbgp.h> |
ea9e9d80 | 21 | #include <asm/pci_x86.h> |
1da177e4 | 22 | |
250c2277 | 23 | /* Simple VGA output */ |
250c2277 TG |
24 | #define VGABASE (__ISA_IO_base + 0xb8000) |
25 | ||
26 | static int max_ypos = 25, max_xpos = 80; | |
c9cf39ae | 27 | static int current_ypos = 25, current_xpos; |
250c2277 TG |
28 | |
29 | static 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 | } | |
61eaf539 JW |
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 | |
250c2277 TG |
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 | ||
70 | static 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 | ||
ea9e9d80 | 79 | static unsigned long early_serial_base = 0x3f8; /* ttyS0 */ |
250c2277 TG |
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 | ||
ea9e9d80 SA |
97 | static unsigned int io_serial_in(unsigned long addr, int offset) |
98 | { | |
99 | return inb(addr + offset); | |
100 | } | |
101 | ||
102 | static void io_serial_out(unsigned long addr, int offset, int value) | |
103 | { | |
104 | outb(value, addr + offset); | |
105 | } | |
106 | ||
107 | static unsigned int (*serial_in)(unsigned long addr, int offset) = io_serial_in; | |
108 | static void (*serial_out)(unsigned long addr, int offset, int value) = io_serial_out; | |
109 | ||
250c2277 TG |
110 | static int early_serial_putc(unsigned char ch) |
111 | { | |
112 | unsigned timeout = 0xffff; | |
5c05917e | 113 | |
ea9e9d80 | 114 | while ((serial_in(early_serial_base, LSR) & XMTRDY) == 0 && --timeout) |
250c2277 | 115 | cpu_relax(); |
ea9e9d80 | 116 | serial_out(early_serial_base, TXR, ch); |
250c2277 TG |
117 | return timeout ? 0 : -1; |
118 | } | |
119 | ||
120 | static void early_serial_write(struct console *con, const char *s, unsigned n) | |
121 | { | |
122 | while (*s && n-- > 0) { | |
123 | if (*s == '\n') | |
124 | early_serial_putc('\r'); | |
125 | early_serial_putc(*s); | |
126 | s++; | |
127 | } | |
128 | } | |
129 | ||
ea9e9d80 SA |
130 | static __init void early_serial_hw_init(unsigned divisor) |
131 | { | |
132 | unsigned char c; | |
133 | ||
134 | serial_out(early_serial_base, LCR, 0x3); /* 8n1 */ | |
135 | serial_out(early_serial_base, IER, 0); /* no interrupt */ | |
136 | serial_out(early_serial_base, FCR, 0); /* no fifo */ | |
137 | serial_out(early_serial_base, MCR, 0x3); /* DTR + RTS */ | |
138 | ||
139 | c = serial_in(early_serial_base, LCR); | |
140 | serial_out(early_serial_base, LCR, c | DLAB); | |
141 | serial_out(early_serial_base, DLL, divisor & 0xff); | |
142 | serial_out(early_serial_base, DLH, (divisor >> 8) & 0xff); | |
143 | serial_out(early_serial_base, LCR, c & ~DLAB); | |
144 | } | |
145 | ||
250c2277 TG |
146 | #define DEFAULT_BAUD 9600 |
147 | ||
148 | static __init void early_serial_init(char *s) | |
149 | { | |
250c2277 | 150 | unsigned divisor; |
ea9e9d80 | 151 | unsigned long baud = DEFAULT_BAUD; |
250c2277 TG |
152 | char *e; |
153 | ||
154 | if (*s == ',') | |
155 | ++s; | |
156 | ||
157 | if (*s) { | |
158 | unsigned port; | |
e941f27a | 159 | if (!strncmp(s, "0x", 2)) { |
250c2277 TG |
160 | early_serial_base = simple_strtoul(s, &e, 16); |
161 | } else { | |
30cec979 | 162 | static const int __initconst bases[] = { 0x3f8, 0x2f8 }; |
250c2277 | 163 | |
e941f27a | 164 | if (!strncmp(s, "ttyS", 4)) |
250c2277 TG |
165 | s += 4; |
166 | port = simple_strtoul(s, &e, 10); | |
167 | if (port > 1 || s == e) | |
168 | port = 0; | |
169 | early_serial_base = bases[port]; | |
170 | } | |
171 | s += strcspn(s, ","); | |
172 | if (*s == ',') | |
173 | s++; | |
174 | } | |
175 | ||
ea9e9d80 | 176 | if (*s) { |
827a82ff SR |
177 | baud = simple_strtoull(s, &e, 0); |
178 | ||
179 | if (baud == 0 || s == e) | |
ea9e9d80 SA |
180 | baud = DEFAULT_BAUD; |
181 | } | |
182 | ||
183 | /* Convert from baud to divisor value */ | |
184 | divisor = 115200 / baud; | |
185 | ||
186 | /* These will always be IO based ports */ | |
187 | serial_in = io_serial_in; | |
188 | serial_out = io_serial_out; | |
189 | ||
190 | /* Set up the HW */ | |
191 | early_serial_hw_init(divisor); | |
192 | } | |
193 | ||
194 | #ifdef CONFIG_PCI | |
7f99f8b9 ME |
195 | static void mem32_serial_out(unsigned long addr, int offset, int value) |
196 | { | |
3435dd08 | 197 | u32 __iomem *vaddr = (u32 __iomem *)addr; |
7f99f8b9 ME |
198 | /* shift implied by pointer type */ |
199 | writel(value, vaddr + offset); | |
200 | } | |
201 | ||
202 | static unsigned int mem32_serial_in(unsigned long addr, int offset) | |
203 | { | |
3435dd08 | 204 | u32 __iomem *vaddr = (u32 __iomem *)addr; |
7f99f8b9 ME |
205 | /* shift implied by pointer type */ |
206 | return readl(vaddr + offset); | |
207 | } | |
208 | ||
ea9e9d80 SA |
209 | /* |
210 | * early_pci_serial_init() | |
211 | * | |
212 | * This function is invoked when the early_printk param starts with "pciserial" | |
d2266bbf FT |
213 | * The rest of the param should be "[force],B:D.F,baud", where B, D & F describe |
214 | * the location of a PCI device that must be a UART device. "force" is optional | |
215 | * and overrides the use of an UART device with a wrong PCI class code. | |
ea9e9d80 SA |
216 | */ |
217 | static __init void early_pci_serial_init(char *s) | |
218 | { | |
219 | unsigned divisor; | |
220 | unsigned long baud = DEFAULT_BAUD; | |
221 | u8 bus, slot, func; | |
7f99f8b9 ME |
222 | u32 classcode, bar0; |
223 | u16 cmdreg; | |
ea9e9d80 | 224 | char *e; |
d2266bbf | 225 | int force = 0; |
ea9e9d80 | 226 | |
ea9e9d80 SA |
227 | if (*s == ',') |
228 | ++s; | |
229 | ||
230 | if (*s == 0) | |
231 | return; | |
232 | ||
d2266bbf FT |
233 | /* Force the use of an UART device with wrong class code */ |
234 | if (!strncmp(s, "force,", 6)) { | |
235 | force = 1; | |
236 | s += 6; | |
237 | } | |
238 | ||
239 | /* | |
240 | * Part the param to get the BDF values | |
241 | */ | |
ea9e9d80 SA |
242 | bus = (u8)simple_strtoul(s, &e, 16); |
243 | s = e; | |
244 | if (*s != ':') | |
245 | return; | |
246 | ++s; | |
247 | slot = (u8)simple_strtoul(s, &e, 16); | |
248 | s = e; | |
249 | if (*s != '.') | |
250 | return; | |
251 | ++s; | |
252 | func = (u8)simple_strtoul(s, &e, 16); | |
253 | s = e; | |
250c2277 | 254 | |
ea9e9d80 SA |
255 | /* A baud might be following */ |
256 | if (*s == ',') | |
257 | s++; | |
258 | ||
259 | /* | |
d2266bbf | 260 | * Find the device from the BDF |
ea9e9d80 SA |
261 | */ |
262 | cmdreg = read_pci_config(bus, slot, func, PCI_COMMAND); | |
263 | classcode = read_pci_config(bus, slot, func, PCI_CLASS_REVISION); | |
264 | bar0 = read_pci_config(bus, slot, func, PCI_BASE_ADDRESS_0); | |
265 | ||
266 | /* | |
267 | * Verify it is a UART type device | |
268 | */ | |
269 | if (((classcode >> 16 != PCI_CLASS_COMMUNICATION_MODEM) && | |
270 | (classcode >> 16 != PCI_CLASS_COMMUNICATION_SERIAL)) || | |
d2266bbf FT |
271 | (((classcode >> 8) & 0xff) != 0x02)) /* 16550 I/F at BAR0 */ { |
272 | if (!force) | |
273 | return; | |
274 | } | |
ea9e9d80 SA |
275 | |
276 | /* | |
277 | * Determine if it is IO or memory mapped | |
278 | */ | |
279 | if (bar0 & 0x01) { | |
280 | /* it is IO mapped */ | |
281 | serial_in = io_serial_in; | |
282 | serial_out = io_serial_out; | |
283 | early_serial_base = bar0&0xfffffffc; | |
284 | write_pci_config(bus, slot, func, PCI_COMMAND, | |
285 | cmdreg|PCI_COMMAND_IO); | |
286 | } else { | |
287 | /* It is memory mapped - assume 32-bit alignment */ | |
288 | serial_in = mem32_serial_in; | |
289 | serial_out = mem32_serial_out; | |
290 | /* WARNING! assuming the address is always in the first 4G */ | |
291 | early_serial_base = | |
292 | (unsigned long)early_ioremap(bar0 & 0xfffffff0, 0x10); | |
293 | write_pci_config(bus, slot, func, PCI_COMMAND, | |
294 | cmdreg|PCI_COMMAND_MEMORY); | |
295 | } | |
296 | ||
297 | /* | |
d2266bbf | 298 | * Initialize the hardware |
ea9e9d80 | 299 | */ |
250c2277 | 300 | if (*s) { |
ea9e9d80 SA |
301 | if (strcmp(s, "nocfg") == 0) |
302 | /* Sometimes, we want to leave the UART alone | |
303 | * and assume the BIOS has set it up correctly. | |
304 | * "nocfg" tells us this is the case, and we | |
305 | * should do no more setup. | |
306 | */ | |
307 | return; | |
308 | if (kstrtoul(s, 0, &baud) < 0 || baud == 0) | |
250c2277 TG |
309 | baud = DEFAULT_BAUD; |
310 | } | |
311 | ||
ea9e9d80 | 312 | /* Convert from baud to divisor value */ |
250c2277 | 313 | divisor = 115200 / baud; |
ea9e9d80 SA |
314 | |
315 | /* Set up the HW */ | |
316 | early_serial_hw_init(divisor); | |
250c2277 | 317 | } |
ea9e9d80 | 318 | #endif |
250c2277 TG |
319 | |
320 | static struct console early_serial_console = { | |
321 | .name = "earlyser", | |
322 | .write = early_serial_write, | |
323 | .flags = CON_PRINTBUFFER, | |
324 | .index = -1, | |
325 | }; | |
326 | ||
c368ef28 | 327 | static void early_console_register(struct console *con, int keep_early) |
c9530948 | 328 | { |
d0380e6c | 329 | if (con->index != -1) { |
429a6e5e JW |
330 | printk(KERN_CRIT "ERROR: earlyprintk= %s already used\n", |
331 | con->name); | |
332 | return; | |
333 | } | |
c9530948 JW |
334 | early_console = con; |
335 | if (keep_early) | |
336 | early_console->flags &= ~CON_BOOT; | |
337 | else | |
338 | early_console->flags |= CON_BOOT; | |
339 | register_console(early_console); | |
340 | } | |
250c2277 TG |
341 | |
342 | static int __init setup_early_printk(char *buf) | |
343 | { | |
c9530948 | 344 | int keep; |
5c05917e | 345 | |
250c2277 TG |
346 | if (!buf) |
347 | return 0; | |
348 | ||
d0380e6c | 349 | if (early_console) |
250c2277 | 350 | return 0; |
250c2277 | 351 | |
c9530948 JW |
352 | keep = (strstr(buf, "keep") != NULL); |
353 | ||
354 | while (*buf != '\0') { | |
355 | if (!strncmp(buf, "serial", 6)) { | |
ea3acb19 JW |
356 | buf += 6; |
357 | early_serial_init(buf); | |
c9530948 | 358 | early_console_register(&early_serial_console, keep); |
ea3acb19 JW |
359 | if (!strncmp(buf, ",ttyS", 5)) |
360 | buf += 5; | |
c9530948 JW |
361 | } |
362 | if (!strncmp(buf, "ttyS", 4)) { | |
363 | early_serial_init(buf + 4); | |
364 | early_console_register(&early_serial_console, keep); | |
365 | } | |
ea9e9d80 SA |
366 | #ifdef CONFIG_PCI |
367 | if (!strncmp(buf, "pciserial", 9)) { | |
368 | early_pci_serial_init(buf + 9); | |
369 | early_console_register(&early_serial_console, keep); | |
370 | buf += 9; /* Keep from match the above "serial" */ | |
371 | } | |
372 | #endif | |
c9530948 JW |
373 | if (!strncmp(buf, "vga", 3) && |
374 | boot_params.screen_info.orig_video_isVGA == 1) { | |
375 | max_xpos = boot_params.screen_info.orig_video_cols; | |
376 | max_ypos = boot_params.screen_info.orig_video_lines; | |
377 | current_ypos = boot_params.screen_info.orig_y; | |
378 | early_console_register(&early_vga_console, keep); | |
379 | } | |
5c05917e | 380 | #ifdef CONFIG_EARLY_PRINTK_DBGP |
c9530948 JW |
381 | if (!strncmp(buf, "dbgp", 4) && !early_dbgp_init(buf + 4)) |
382 | early_console_register(&early_dbgp_console, keep); | |
5c05917e | 383 | #endif |
250c2277 | 384 | #ifdef CONFIG_HVC_XEN |
c9530948 JW |
385 | if (!strncmp(buf, "xen", 3)) |
386 | early_console_register(&xenboot_console, keep); | |
c20b5c33 | 387 | #endif |
1b5aeebf LB |
388 | #ifdef CONFIG_EARLY_PRINTK_USB_XDBC |
389 | if (!strncmp(buf, "xdbc", 4)) | |
390 | early_xdbc_parse_parameter(buf + 4); | |
391 | #endif | |
72548e83 | 392 | |
c9530948 | 393 | buf++; |
250c2277 | 394 | } |
250c2277 TG |
395 | return 0; |
396 | } | |
5c05917e | 397 | |
250c2277 | 398 | early_param("earlyprintk", setup_early_printk); |