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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Procedures for drawing on the screen early on in the boot process.
4 *
5 * Benjamin Herrenschmidt <benh@kernel.crashing.org>
6 */
7#include <linux/kernel.h>
8#include <linux/string.h>
9#include <linux/init.h>
10#include <linux/export.h>
11#include <linux/memblock.h>
12#include <linux/pgtable.h>
13#include <linux/of.h>
14
15#include <asm/sections.h>
16#include <asm/btext.h>
17#include <asm/page.h>
18#include <asm/mmu.h>
19#include <asm/io.h>
20#include <asm/processor.h>
21#include <asm/udbg.h>
22
23#define NO_SCROLL
24
25#ifndef NO_SCROLL
26static void scrollscreen(void);
27#endif
28
29#define __force_data __section(".data")
30
31static int g_loc_X __force_data;
32static int g_loc_Y __force_data;
33static int g_max_loc_X __force_data;
34static int g_max_loc_Y __force_data;
35
36static int dispDeviceRowBytes __force_data;
37static int dispDeviceDepth __force_data;
38static int dispDeviceRect[4] __force_data;
39static unsigned char *dispDeviceBase __force_data;
40static unsigned char *logicalDisplayBase __force_data;
41
42unsigned long disp_BAT[2] __initdata = {0, 0};
43
44#define cmapsz (16*256)
45
46static unsigned char vga_font[cmapsz];
47
48static int boot_text_mapped __force_data;
49
50extern void rmci_on(void);
51extern void rmci_off(void);
52
53static inline void rmci_maybe_on(void)
54{
55#if defined(CONFIG_PPC_EARLY_DEBUG_BOOTX) && defined(CONFIG_PPC64)
56 if (!(mfmsr() & MSR_DR))
57 rmci_on();
58#endif
59}
60
61static inline void rmci_maybe_off(void)
62{
63#if defined(CONFIG_PPC_EARLY_DEBUG_BOOTX) && defined(CONFIG_PPC64)
64 if (!(mfmsr() & MSR_DR))
65 rmci_off();
66#endif
67}
68
69
70#ifdef CONFIG_PPC32
71/* Calc BAT values for mapping the display and store them
72 * in disp_BAT. Those values are then used from head.S to map
73 * the display during identify_machine() and MMU_Init()
74 *
75 * The display is mapped to virtual address 0xD0000000, rather
76 * than 1:1, because some CHRP machines put the frame buffer
77 * in the region starting at 0xC0000000 (PAGE_OFFSET).
78 * This mapping is temporary and will disappear as soon as the
79 * setup done by MMU_Init() is applied.
80 *
81 * For now, we align the BAT and then map 8Mb on 601 and 16Mb
82 * on other PPCs. This may cause trouble if the framebuffer
83 * is really badly aligned, but I didn't encounter this case
84 * yet.
85 */
86void __init btext_prepare_BAT(void)
87{
88 unsigned long vaddr = PAGE_OFFSET + 0x10000000;
89 unsigned long addr;
90 unsigned long lowbits;
91
92 addr = (unsigned long)dispDeviceBase;
93 if (!addr) {
94 boot_text_mapped = 0;
95 return;
96 }
97 lowbits = addr & ~0xFF000000UL;
98 addr &= 0xFF000000UL;
99 disp_BAT[0] = vaddr | (BL_16M<<2) | 2;
100 disp_BAT[1] = addr | (_PAGE_NO_CACHE | _PAGE_GUARDED | BPP_RW);
101 logicalDisplayBase = (void *) (vaddr + lowbits);
102}
103#endif
104
105
106/* This function can be used to enable the early boot text when doing
107 * OF booting or within bootx init. It must be followed by a btext_unmap()
108 * call before the logical address becomes unusable
109 */
110void __init btext_setup_display(int width, int height, int depth, int pitch,
111 unsigned long address)
112{
113 g_loc_X = 0;
114 g_loc_Y = 0;
115 g_max_loc_X = width / 8;
116 g_max_loc_Y = height / 16;
117 logicalDisplayBase = (unsigned char *)address;
118 dispDeviceBase = (unsigned char *)address;
119 dispDeviceRowBytes = pitch;
120 dispDeviceDepth = depth == 15 ? 16 : depth;
121 dispDeviceRect[0] = dispDeviceRect[1] = 0;
122 dispDeviceRect[2] = width;
123 dispDeviceRect[3] = height;
124 boot_text_mapped = 1;
125}
126
127void __init btext_unmap(void)
128{
129 boot_text_mapped = 0;
130}
131
132/* Here's a small text engine to use during early boot
133 * or for debugging purposes
134 *
135 * todo:
136 *
137 * - build some kind of vgacon with it to enable early printk
138 * - move to a separate file
139 * - add a few video driver hooks to keep in sync with display
140 * changes.
141 */
142
143void btext_map(void)
144{
145 unsigned long base, offset, size;
146 unsigned char *vbase;
147
148 /* By default, we are no longer mapped */
149 boot_text_mapped = 0;
150 if (!dispDeviceBase)
151 return;
152 base = ((unsigned long) dispDeviceBase) & 0xFFFFF000UL;
153 offset = ((unsigned long) dispDeviceBase) - base;
154 size = dispDeviceRowBytes * dispDeviceRect[3] + offset
155 + dispDeviceRect[0];
156 vbase = ioremap_wc(base, size);
157 if (!vbase)
158 return;
159 logicalDisplayBase = vbase + offset;
160 boot_text_mapped = 1;
161}
162
163static int __init btext_initialize(struct device_node *np)
164{
165 unsigned int width, height, depth, pitch;
166 unsigned long address = 0;
167 const u32 *prop;
168
169 prop = of_get_property(np, "linux,bootx-width", NULL);
170 if (prop == NULL)
171 prop = of_get_property(np, "width", NULL);
172 if (prop == NULL)
173 return -EINVAL;
174 width = *prop;
175 prop = of_get_property(np, "linux,bootx-height", NULL);
176 if (prop == NULL)
177 prop = of_get_property(np, "height", NULL);
178 if (prop == NULL)
179 return -EINVAL;
180 height = *prop;
181 prop = of_get_property(np, "linux,bootx-depth", NULL);
182 if (prop == NULL)
183 prop = of_get_property(np, "depth", NULL);
184 if (prop == NULL)
185 return -EINVAL;
186 depth = *prop;
187 pitch = width * ((depth + 7) / 8);
188 prop = of_get_property(np, "linux,bootx-linebytes", NULL);
189 if (prop == NULL)
190 prop = of_get_property(np, "linebytes", NULL);
191 if (prop && *prop != 0xffffffffu)
192 pitch = *prop;
193 if (pitch == 1)
194 pitch = 0x1000;
195 prop = of_get_property(np, "linux,bootx-addr", NULL);
196 if (prop == NULL)
197 prop = of_get_property(np, "address", NULL);
198 if (prop)
199 address = *prop;
200
201 /* FIXME: Add support for PCI reg properties. Right now, only
202 * reliable on macs
203 */
204 if (address == 0)
205 return -EINVAL;
206
207 g_loc_X = 0;
208 g_loc_Y = 0;
209 g_max_loc_X = width / 8;
210 g_max_loc_Y = height / 16;
211 dispDeviceBase = (unsigned char *)address;
212 dispDeviceRowBytes = pitch;
213 dispDeviceDepth = depth == 15 ? 16 : depth;
214 dispDeviceRect[0] = dispDeviceRect[1] = 0;
215 dispDeviceRect[2] = width;
216 dispDeviceRect[3] = height;
217
218 btext_map();
219
220 return 0;
221}
222
223int __init btext_find_display(int allow_nonstdout)
224{
225 struct device_node *np = of_stdout;
226 int rc = -ENODEV;
227
228 if (!of_node_is_type(np, "display")) {
229 printk("boot stdout isn't a display !\n");
230 np = NULL;
231 }
232 if (np)
233 rc = btext_initialize(np);
234 if (rc == 0 || !allow_nonstdout)
235 return rc;
236
237 for_each_node_by_type(np, "display") {
238 if (of_get_property(np, "linux,opened", NULL)) {
239 printk("trying %pOF ...\n", np);
240 rc = btext_initialize(np);
241 printk("result: %d\n", rc);
242 }
243 if (rc == 0) {
244 of_node_put(np);
245 break;
246 }
247 }
248 return rc;
249}
250
251/* Calc the base address of a given point (x,y) */
252static unsigned char * calc_base(int x, int y)
253{
254 unsigned char *base;
255
256 base = logicalDisplayBase;
257 if (!base)
258 base = dispDeviceBase;
259 base += (x + dispDeviceRect[0]) * (dispDeviceDepth >> 3);
260 base += (y + dispDeviceRect[1]) * dispDeviceRowBytes;
261 return base;
262}
263
264/* Adjust the display to a new resolution */
265void btext_update_display(unsigned long phys, int width, int height,
266 int depth, int pitch)
267{
268 if (!dispDeviceBase)
269 return;
270
271 /* check it's the same frame buffer (within 256MB) */
272 if ((phys ^ (unsigned long)dispDeviceBase) & 0xf0000000)
273 return;
274
275 dispDeviceBase = (__u8 *) phys;
276 dispDeviceRect[0] = 0;
277 dispDeviceRect[1] = 0;
278 dispDeviceRect[2] = width;
279 dispDeviceRect[3] = height;
280 dispDeviceDepth = depth;
281 dispDeviceRowBytes = pitch;
282 if (boot_text_mapped) {
283 iounmap(logicalDisplayBase);
284 boot_text_mapped = 0;
285 }
286 btext_map();
287 g_loc_X = 0;
288 g_loc_Y = 0;
289 g_max_loc_X = width / 8;
290 g_max_loc_Y = height / 16;
291}
292EXPORT_SYMBOL(btext_update_display);
293
294void __init btext_clearscreen(void)
295{
296 unsigned int *base = (unsigned int *)calc_base(0, 0);
297 unsigned long width = ((dispDeviceRect[2] - dispDeviceRect[0]) *
298 (dispDeviceDepth >> 3)) >> 2;
299 int i,j;
300
301 rmci_maybe_on();
302 for (i=0; i<(dispDeviceRect[3] - dispDeviceRect[1]); i++)
303 {
304 unsigned int *ptr = base;
305 for(j=width; j; --j)
306 *(ptr++) = 0;
307 base += (dispDeviceRowBytes >> 2);
308 }
309 rmci_maybe_off();
310}
311
312void __init btext_flushscreen(void)
313{
314 unsigned int *base = (unsigned int *)calc_base(0, 0);
315 unsigned long width = ((dispDeviceRect[2] - dispDeviceRect[0]) *
316 (dispDeviceDepth >> 3)) >> 2;
317 int i,j;
318
319 for (i=0; i < (dispDeviceRect[3] - dispDeviceRect[1]); i++)
320 {
321 unsigned int *ptr = base;
322 for(j = width; j > 0; j -= 8) {
323 __asm__ __volatile__ ("dcbst 0,%0" :: "r" (ptr));
324 ptr += 8;
325 }
326 base += (dispDeviceRowBytes >> 2);
327 }
328 __asm__ __volatile__ ("sync" ::: "memory");
329}
330
331void __init btext_flushline(void)
332{
333 unsigned int *base = (unsigned int *)calc_base(0, g_loc_Y << 4);
334 unsigned long width = ((dispDeviceRect[2] - dispDeviceRect[0]) *
335 (dispDeviceDepth >> 3)) >> 2;
336 int i,j;
337
338 for (i=0; i < 16; i++)
339 {
340 unsigned int *ptr = base;
341 for(j = width; j > 0; j -= 8) {
342 __asm__ __volatile__ ("dcbst 0,%0" :: "r" (ptr));
343 ptr += 8;
344 }
345 base += (dispDeviceRowBytes >> 2);
346 }
347 __asm__ __volatile__ ("sync" ::: "memory");
348}
349
350
351#ifndef NO_SCROLL
352static void scrollscreen(void)
353{
354 unsigned int *src = (unsigned int *)calc_base(0,16);
355 unsigned int *dst = (unsigned int *)calc_base(0,0);
356 unsigned long width = ((dispDeviceRect[2] - dispDeviceRect[0]) *
357 (dispDeviceDepth >> 3)) >> 2;
358 int i,j;
359
360 rmci_maybe_on();
361
362 for (i=0; i<(dispDeviceRect[3] - dispDeviceRect[1] - 16); i++)
363 {
364 unsigned int *src_ptr = src;
365 unsigned int *dst_ptr = dst;
366 for(j=width; j; --j)
367 *(dst_ptr++) = *(src_ptr++);
368 src += (dispDeviceRowBytes >> 2);
369 dst += (dispDeviceRowBytes >> 2);
370 }
371 for (i=0; i<16; i++)
372 {
373 unsigned int *dst_ptr = dst;
374 for(j=width; j; --j)
375 *(dst_ptr++) = 0;
376 dst += (dispDeviceRowBytes >> 2);
377 }
378
379 rmci_maybe_off();
380}
381#endif /* ndef NO_SCROLL */
382
383static unsigned int expand_bits_8[16] = {
384 0x00000000,
385 0x000000ff,
386 0x0000ff00,
387 0x0000ffff,
388 0x00ff0000,
389 0x00ff00ff,
390 0x00ffff00,
391 0x00ffffff,
392 0xff000000,
393 0xff0000ff,
394 0xff00ff00,
395 0xff00ffff,
396 0xffff0000,
397 0xffff00ff,
398 0xffffff00,
399 0xffffffff
400};
401
402static unsigned int expand_bits_16[4] = {
403 0x00000000,
404 0x0000ffff,
405 0xffff0000,
406 0xffffffff
407};
408
409
410static void draw_byte_32(unsigned char *font, unsigned int *base, int rb)
411{
412 int l, bits;
413 int fg = 0xFFFFFFFFUL;
414 int bg = 0x00000000UL;
415
416 for (l = 0; l < 16; ++l)
417 {
418 bits = *font++;
419 base[0] = (-(bits >> 7) & fg) ^ bg;
420 base[1] = (-((bits >> 6) & 1) & fg) ^ bg;
421 base[2] = (-((bits >> 5) & 1) & fg) ^ bg;
422 base[3] = (-((bits >> 4) & 1) & fg) ^ bg;
423 base[4] = (-((bits >> 3) & 1) & fg) ^ bg;
424 base[5] = (-((bits >> 2) & 1) & fg) ^ bg;
425 base[6] = (-((bits >> 1) & 1) & fg) ^ bg;
426 base[7] = (-(bits & 1) & fg) ^ bg;
427 base = (unsigned int *) ((char *)base + rb);
428 }
429}
430
431static inline void draw_byte_16(unsigned char *font, unsigned int *base, int rb)
432{
433 int l, bits;
434 int fg = 0xFFFFFFFFUL;
435 int bg = 0x00000000UL;
436 unsigned int *eb = (int *)expand_bits_16;
437
438 for (l = 0; l < 16; ++l)
439 {
440 bits = *font++;
441 base[0] = (eb[bits >> 6] & fg) ^ bg;
442 base[1] = (eb[(bits >> 4) & 3] & fg) ^ bg;
443 base[2] = (eb[(bits >> 2) & 3] & fg) ^ bg;
444 base[3] = (eb[bits & 3] & fg) ^ bg;
445 base = (unsigned int *) ((char *)base + rb);
446 }
447}
448
449static inline void draw_byte_8(unsigned char *font, unsigned int *base, int rb)
450{
451 int l, bits;
452 int fg = 0x0F0F0F0FUL;
453 int bg = 0x00000000UL;
454 unsigned int *eb = (int *)expand_bits_8;
455
456 for (l = 0; l < 16; ++l)
457 {
458 bits = *font++;
459 base[0] = (eb[bits >> 4] & fg) ^ bg;
460 base[1] = (eb[bits & 0xf] & fg) ^ bg;
461 base = (unsigned int *) ((char *)base + rb);
462 }
463}
464
465static noinline void draw_byte(unsigned char c, long locX, long locY)
466{
467 unsigned char *base = calc_base(locX << 3, locY << 4);
468 unsigned char *font = &vga_font[((unsigned int)c) * 16];
469 int rb = dispDeviceRowBytes;
470
471 rmci_maybe_on();
472 switch(dispDeviceDepth) {
473 case 24:
474 case 32:
475 draw_byte_32(font, (unsigned int *)base, rb);
476 break;
477 case 15:
478 case 16:
479 draw_byte_16(font, (unsigned int *)base, rb);
480 break;
481 case 8:
482 draw_byte_8(font, (unsigned int *)base, rb);
483 break;
484 }
485 rmci_maybe_off();
486}
487
488void btext_drawchar(char c)
489{
490 int cline = 0;
491#ifdef NO_SCROLL
492 int x;
493#endif
494 if (!boot_text_mapped)
495 return;
496
497 switch (c) {
498 case '\b':
499 if (g_loc_X > 0)
500 --g_loc_X;
501 break;
502 case '\t':
503 g_loc_X = (g_loc_X & -8) + 8;
504 break;
505 case '\r':
506 g_loc_X = 0;
507 break;
508 case '\n':
509 g_loc_X = 0;
510 g_loc_Y++;
511 cline = 1;
512 break;
513 default:
514 draw_byte(c, g_loc_X++, g_loc_Y);
515 }
516 if (g_loc_X >= g_max_loc_X) {
517 g_loc_X = 0;
518 g_loc_Y++;
519 cline = 1;
520 }
521#ifndef NO_SCROLL
522 while (g_loc_Y >= g_max_loc_Y) {
523 scrollscreen();
524 g_loc_Y--;
525 }
526#else
527 /* wrap around from bottom to top of screen so we don't
528 waste time scrolling each line. -- paulus. */
529 if (g_loc_Y >= g_max_loc_Y)
530 g_loc_Y = 0;
531 if (cline) {
532 for (x = 0; x < g_max_loc_X; ++x)
533 draw_byte(' ', x, g_loc_Y);
534 }
535#endif
536}
537
538void btext_drawstring(const char *c)
539{
540 if (!boot_text_mapped)
541 return;
542 while (*c)
543 btext_drawchar(*c++);
544}
545
546void __init btext_drawtext(const char *c, unsigned int len)
547{
548 if (!boot_text_mapped)
549 return;
550 while (len--)
551 btext_drawchar(*c++);
552}
553
554void __init btext_drawhex(unsigned long v)
555{
556 if (!boot_text_mapped)
557 return;
558#ifdef CONFIG_PPC64
559 btext_drawchar(hex_asc_hi(v >> 56));
560 btext_drawchar(hex_asc_lo(v >> 56));
561 btext_drawchar(hex_asc_hi(v >> 48));
562 btext_drawchar(hex_asc_lo(v >> 48));
563 btext_drawchar(hex_asc_hi(v >> 40));
564 btext_drawchar(hex_asc_lo(v >> 40));
565 btext_drawchar(hex_asc_hi(v >> 32));
566 btext_drawchar(hex_asc_lo(v >> 32));
567#endif
568 btext_drawchar(hex_asc_hi(v >> 24));
569 btext_drawchar(hex_asc_lo(v >> 24));
570 btext_drawchar(hex_asc_hi(v >> 16));
571 btext_drawchar(hex_asc_lo(v >> 16));
572 btext_drawchar(hex_asc_hi(v >> 8));
573 btext_drawchar(hex_asc_lo(v >> 8));
574 btext_drawchar(hex_asc_hi(v));
575 btext_drawchar(hex_asc_lo(v));
576 btext_drawchar(' ');
577}
578
579void __init udbg_init_btext(void)
580{
581 /* If btext is enabled, we might have a BAT setup for early display,
582 * thus we do enable some very basic udbg output
583 */
584 udbg_putc = btext_drawchar;
585}
586
587static unsigned char vga_font[cmapsz] = {
5880x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
5890x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7e, 0x81, 0xa5, 0x81, 0x81, 0xbd,
5900x99, 0x81, 0x81, 0x7e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7e, 0xff,
5910xdb, 0xff, 0xff, 0xc3, 0xe7, 0xff, 0xff, 0x7e, 0x00, 0x00, 0x00, 0x00,
5920x00, 0x00, 0x00, 0x00, 0x6c, 0xfe, 0xfe, 0xfe, 0xfe, 0x7c, 0x38, 0x10,
5930x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x38, 0x7c, 0xfe,
5940x7c, 0x38, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18,
5950x3c, 0x3c, 0xe7, 0xe7, 0xe7, 0x18, 0x18, 0x3c, 0x00, 0x00, 0x00, 0x00,
5960x00, 0x00, 0x00, 0x18, 0x3c, 0x7e, 0xff, 0xff, 0x7e, 0x18, 0x18, 0x3c,
5970x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x3c,
5980x3c, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff,
5990xff, 0xff, 0xe7, 0xc3, 0xc3, 0xe7, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
6000x00, 0x00, 0x00, 0x00, 0x00, 0x3c, 0x66, 0x42, 0x42, 0x66, 0x3c, 0x00,
6010x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc3, 0x99, 0xbd,
6020xbd, 0x99, 0xc3, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x1e, 0x0e,
6030x1a, 0x32, 0x78, 0xcc, 0xcc, 0xcc, 0xcc, 0x78, 0x00, 0x00, 0x00, 0x00,
6040x00, 0x00, 0x3c, 0x66, 0x66, 0x66, 0x66, 0x3c, 0x18, 0x7e, 0x18, 0x18,
6050x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x3f, 0x33, 0x3f, 0x30, 0x30, 0x30,
6060x30, 0x70, 0xf0, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7f, 0x63,
6070x7f, 0x63, 0x63, 0x63, 0x63, 0x67, 0xe7, 0xe6, 0xc0, 0x00, 0x00, 0x00,
6080x00, 0x00, 0x00, 0x18, 0x18, 0xdb, 0x3c, 0xe7, 0x3c, 0xdb, 0x18, 0x18,
6090x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfe, 0xf8,
6100xf0, 0xe0, 0xc0, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x06, 0x0e,
6110x1e, 0x3e, 0xfe, 0x3e, 0x1e, 0x0e, 0x06, 0x02, 0x00, 0x00, 0x00, 0x00,
6120x00, 0x00, 0x18, 0x3c, 0x7e, 0x18, 0x18, 0x18, 0x7e, 0x3c, 0x18, 0x00,
6130x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66,
6140x66, 0x00, 0x66, 0x66, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7f, 0xdb,
6150xdb, 0xdb, 0x7b, 0x1b, 0x1b, 0x1b, 0x1b, 0x1b, 0x00, 0x00, 0x00, 0x00,
6160x00, 0x7c, 0xc6, 0x60, 0x38, 0x6c, 0xc6, 0xc6, 0x6c, 0x38, 0x0c, 0xc6,
6170x7c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
6180xfe, 0xfe, 0xfe, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x3c,
6190x7e, 0x18, 0x18, 0x18, 0x7e, 0x3c, 0x18, 0x7e, 0x00, 0x00, 0x00, 0x00,
6200x00, 0x00, 0x18, 0x3c, 0x7e, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
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7990x7c, 0x62, 0x66, 0x6f, 0x66, 0x66, 0x66, 0xf3, 0x00, 0x00, 0x00, 0x00,
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8050x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x30, 0x60, 0x00, 0xcc, 0xcc, 0xcc,
8060xcc, 0xcc, 0xcc, 0x76, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x76, 0xdc,
8070x00, 0xdc, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x00, 0x00, 0x00, 0x00,
8080x76, 0xdc, 0x00, 0xc6, 0xe6, 0xf6, 0xfe, 0xde, 0xce, 0xc6, 0xc6, 0xc6,
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9230x0c, 0x0c, 0x0c, 0xec, 0x6c, 0x6c, 0x3c, 0x1c, 0x00, 0x00, 0x00, 0x00,
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9260x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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9280x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
9290x00, 0x00, 0x00, 0x00,
930};
931
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Procedures for drawing on the screen early on in the boot process.
4 *
5 * Benjamin Herrenschmidt <benh@kernel.crashing.org>
6 */
7#include <linux/kernel.h>
8#include <linux/string.h>
9#include <linux/init.h>
10#include <linux/export.h>
11#include <linux/font.h>
12#include <linux/memblock.h>
13#include <linux/pgtable.h>
14#include <linux/of.h>
15
16#include <asm/sections.h>
17#include <asm/btext.h>
18#include <asm/page.h>
19#include <asm/mmu.h>
20#include <asm/io.h>
21#include <asm/processor.h>
22#include <asm/udbg.h>
23
24#define NO_SCROLL
25
26#ifndef NO_SCROLL
27static void scrollscreen(void);
28#endif
29
30#define __force_data __section(".data")
31
32static int g_loc_X __force_data;
33static int g_loc_Y __force_data;
34static int g_max_loc_X __force_data;
35static int g_max_loc_Y __force_data;
36
37static int dispDeviceRowBytes __force_data;
38static int dispDeviceDepth __force_data;
39static int dispDeviceRect[4] __force_data;
40static unsigned char *dispDeviceBase __force_data;
41static unsigned char *logicalDisplayBase __force_data;
42
43unsigned long disp_BAT[2] __initdata = {0, 0};
44
45static int boot_text_mapped __force_data;
46
47extern void rmci_on(void);
48extern void rmci_off(void);
49
50static inline void rmci_maybe_on(void)
51{
52#if defined(CONFIG_PPC_EARLY_DEBUG_BOOTX) && defined(CONFIG_PPC64)
53 if (!(mfmsr() & MSR_DR))
54 rmci_on();
55#endif
56}
57
58static inline void rmci_maybe_off(void)
59{
60#if defined(CONFIG_PPC_EARLY_DEBUG_BOOTX) && defined(CONFIG_PPC64)
61 if (!(mfmsr() & MSR_DR))
62 rmci_off();
63#endif
64}
65
66
67#ifdef CONFIG_PPC32
68/* Calc BAT values for mapping the display and store them
69 * in disp_BAT. Those values are then used from head.S to map
70 * the display during identify_machine() and MMU_Init()
71 *
72 * The display is mapped to virtual address 0xD0000000, rather
73 * than 1:1, because some CHRP machines put the frame buffer
74 * in the region starting at 0xC0000000 (PAGE_OFFSET).
75 * This mapping is temporary and will disappear as soon as the
76 * setup done by MMU_Init() is applied.
77 *
78 * For now, we align the BAT and then map 8Mb on 601 and 16Mb
79 * on other PPCs. This may cause trouble if the framebuffer
80 * is really badly aligned, but I didn't encounter this case
81 * yet.
82 */
83void __init btext_prepare_BAT(void)
84{
85 unsigned long vaddr = PAGE_OFFSET + 0x10000000;
86 unsigned long addr;
87 unsigned long lowbits;
88
89 addr = (unsigned long)dispDeviceBase;
90 if (!addr) {
91 boot_text_mapped = 0;
92 return;
93 }
94 lowbits = addr & ~0xFF000000UL;
95 addr &= 0xFF000000UL;
96 disp_BAT[0] = vaddr | (BL_16M<<2) | 2;
97 disp_BAT[1] = addr | (_PAGE_NO_CACHE | _PAGE_GUARDED | BPP_RW);
98 logicalDisplayBase = (void *) (vaddr + lowbits);
99}
100#endif
101
102
103/* This function can be used to enable the early boot text when doing
104 * OF booting or within bootx init. It must be followed by a btext_unmap()
105 * call before the logical address becomes unusable
106 */
107void __init btext_setup_display(int width, int height, int depth, int pitch,
108 unsigned long address)
109{
110 g_loc_X = 0;
111 g_loc_Y = 0;
112 g_max_loc_X = width / 8;
113 g_max_loc_Y = height / 16;
114 logicalDisplayBase = (unsigned char *)address;
115 dispDeviceBase = (unsigned char *)address;
116 dispDeviceRowBytes = pitch;
117 dispDeviceDepth = depth == 15 ? 16 : depth;
118 dispDeviceRect[0] = dispDeviceRect[1] = 0;
119 dispDeviceRect[2] = width;
120 dispDeviceRect[3] = height;
121 boot_text_mapped = 1;
122}
123
124void __init btext_unmap(void)
125{
126 boot_text_mapped = 0;
127}
128
129/* Here's a small text engine to use during early boot
130 * or for debugging purposes
131 *
132 * todo:
133 *
134 * - build some kind of vgacon with it to enable early printk
135 * - move to a separate file
136 * - add a few video driver hooks to keep in sync with display
137 * changes.
138 */
139
140void btext_map(void)
141{
142 unsigned long base, offset, size;
143 unsigned char *vbase;
144
145 /* By default, we are no longer mapped */
146 boot_text_mapped = 0;
147 if (!dispDeviceBase)
148 return;
149 base = ((unsigned long) dispDeviceBase) & 0xFFFFF000UL;
150 offset = ((unsigned long) dispDeviceBase) - base;
151 size = dispDeviceRowBytes * dispDeviceRect[3] + offset
152 + dispDeviceRect[0];
153 vbase = ioremap_wc(base, size);
154 if (!vbase)
155 return;
156 logicalDisplayBase = vbase + offset;
157 boot_text_mapped = 1;
158}
159
160static int __init btext_initialize(struct device_node *np)
161{
162 unsigned int width, height, depth, pitch;
163 unsigned long address = 0;
164 const u32 *prop;
165
166 prop = of_get_property(np, "linux,bootx-width", NULL);
167 if (prop == NULL)
168 prop = of_get_property(np, "width", NULL);
169 if (prop == NULL)
170 return -EINVAL;
171 width = *prop;
172 prop = of_get_property(np, "linux,bootx-height", NULL);
173 if (prop == NULL)
174 prop = of_get_property(np, "height", NULL);
175 if (prop == NULL)
176 return -EINVAL;
177 height = *prop;
178 prop = of_get_property(np, "linux,bootx-depth", NULL);
179 if (prop == NULL)
180 prop = of_get_property(np, "depth", NULL);
181 if (prop == NULL)
182 return -EINVAL;
183 depth = *prop;
184 pitch = width * ((depth + 7) / 8);
185 prop = of_get_property(np, "linux,bootx-linebytes", NULL);
186 if (prop == NULL)
187 prop = of_get_property(np, "linebytes", NULL);
188 if (prop && *prop != 0xffffffffu)
189 pitch = *prop;
190 if (pitch == 1)
191 pitch = 0x1000;
192 prop = of_get_property(np, "linux,bootx-addr", NULL);
193 if (prop == NULL)
194 prop = of_get_property(np, "address", NULL);
195 if (prop)
196 address = *prop;
197
198 /* FIXME: Add support for PCI reg properties. Right now, only
199 * reliable on macs
200 */
201 if (address == 0)
202 return -EINVAL;
203
204 g_loc_X = 0;
205 g_loc_Y = 0;
206 g_max_loc_X = width / 8;
207 g_max_loc_Y = height / 16;
208 dispDeviceBase = (unsigned char *)address;
209 dispDeviceRowBytes = pitch;
210 dispDeviceDepth = depth == 15 ? 16 : depth;
211 dispDeviceRect[0] = dispDeviceRect[1] = 0;
212 dispDeviceRect[2] = width;
213 dispDeviceRect[3] = height;
214
215 btext_map();
216
217 return 0;
218}
219
220int __init btext_find_display(int allow_nonstdout)
221{
222 struct device_node *np = of_stdout;
223 int rc = -ENODEV;
224
225 if (!of_node_is_type(np, "display")) {
226 printk("boot stdout isn't a display !\n");
227 np = NULL;
228 }
229 if (np)
230 rc = btext_initialize(np);
231 if (rc == 0 || !allow_nonstdout)
232 return rc;
233
234 for_each_node_by_type(np, "display") {
235 if (of_property_read_bool(np, "linux,opened")) {
236 printk("trying %pOF ...\n", np);
237 rc = btext_initialize(np);
238 printk("result: %d\n", rc);
239 }
240 if (rc == 0) {
241 of_node_put(np);
242 break;
243 }
244 }
245 return rc;
246}
247
248/* Calc the base address of a given point (x,y) */
249static unsigned char * calc_base(int x, int y)
250{
251 unsigned char *base;
252
253 base = logicalDisplayBase;
254 if (!base)
255 base = dispDeviceBase;
256 base += (x + dispDeviceRect[0]) * (dispDeviceDepth >> 3);
257 base += (y + dispDeviceRect[1]) * dispDeviceRowBytes;
258 return base;
259}
260
261/* Adjust the display to a new resolution */
262void btext_update_display(unsigned long phys, int width, int height,
263 int depth, int pitch)
264{
265 if (!dispDeviceBase)
266 return;
267
268 /* check it's the same frame buffer (within 256MB) */
269 if ((phys ^ (unsigned long)dispDeviceBase) & 0xf0000000)
270 return;
271
272 dispDeviceBase = (__u8 *) phys;
273 dispDeviceRect[0] = 0;
274 dispDeviceRect[1] = 0;
275 dispDeviceRect[2] = width;
276 dispDeviceRect[3] = height;
277 dispDeviceDepth = depth;
278 dispDeviceRowBytes = pitch;
279 if (boot_text_mapped) {
280 iounmap(logicalDisplayBase);
281 boot_text_mapped = 0;
282 }
283 btext_map();
284 g_loc_X = 0;
285 g_loc_Y = 0;
286 g_max_loc_X = width / 8;
287 g_max_loc_Y = height / 16;
288}
289EXPORT_SYMBOL(btext_update_display);
290
291void __init btext_clearscreen(void)
292{
293 unsigned int *base = (unsigned int *)calc_base(0, 0);
294 unsigned long width = ((dispDeviceRect[2] - dispDeviceRect[0]) *
295 (dispDeviceDepth >> 3)) >> 2;
296 int i,j;
297
298 rmci_maybe_on();
299 for (i=0; i<(dispDeviceRect[3] - dispDeviceRect[1]); i++)
300 {
301 unsigned int *ptr = base;
302 for(j=width; j; --j)
303 *(ptr++) = 0;
304 base += (dispDeviceRowBytes >> 2);
305 }
306 rmci_maybe_off();
307}
308
309void __init btext_flushscreen(void)
310{
311 unsigned int *base = (unsigned int *)calc_base(0, 0);
312 unsigned long width = ((dispDeviceRect[2] - dispDeviceRect[0]) *
313 (dispDeviceDepth >> 3)) >> 2;
314 int i,j;
315
316 for (i=0; i < (dispDeviceRect[3] - dispDeviceRect[1]); i++)
317 {
318 unsigned int *ptr = base;
319 for(j = width; j > 0; j -= 8) {
320 __asm__ __volatile__ ("dcbst 0,%0" :: "r" (ptr));
321 ptr += 8;
322 }
323 base += (dispDeviceRowBytes >> 2);
324 }
325 __asm__ __volatile__ ("sync" ::: "memory");
326}
327
328void __init btext_flushline(void)
329{
330 unsigned int *base = (unsigned int *)calc_base(0, g_loc_Y << 4);
331 unsigned long width = ((dispDeviceRect[2] - dispDeviceRect[0]) *
332 (dispDeviceDepth >> 3)) >> 2;
333 int i,j;
334
335 for (i=0; i < 16; i++)
336 {
337 unsigned int *ptr = base;
338 for(j = width; j > 0; j -= 8) {
339 __asm__ __volatile__ ("dcbst 0,%0" :: "r" (ptr));
340 ptr += 8;
341 }
342 base += (dispDeviceRowBytes >> 2);
343 }
344 __asm__ __volatile__ ("sync" ::: "memory");
345}
346
347
348#ifndef NO_SCROLL
349static void scrollscreen(void)
350{
351 unsigned int *src = (unsigned int *)calc_base(0,16);
352 unsigned int *dst = (unsigned int *)calc_base(0,0);
353 unsigned long width = ((dispDeviceRect[2] - dispDeviceRect[0]) *
354 (dispDeviceDepth >> 3)) >> 2;
355 int i,j;
356
357 rmci_maybe_on();
358
359 for (i=0; i<(dispDeviceRect[3] - dispDeviceRect[1] - 16); i++)
360 {
361 unsigned int *src_ptr = src;
362 unsigned int *dst_ptr = dst;
363 for(j=width; j; --j)
364 *(dst_ptr++) = *(src_ptr++);
365 src += (dispDeviceRowBytes >> 2);
366 dst += (dispDeviceRowBytes >> 2);
367 }
368 for (i=0; i<16; i++)
369 {
370 unsigned int *dst_ptr = dst;
371 for(j=width; j; --j)
372 *(dst_ptr++) = 0;
373 dst += (dispDeviceRowBytes >> 2);
374 }
375
376 rmci_maybe_off();
377}
378#endif /* ndef NO_SCROLL */
379
380static unsigned int expand_bits_8[16] = {
381 0x00000000,
382 0x000000ff,
383 0x0000ff00,
384 0x0000ffff,
385 0x00ff0000,
386 0x00ff00ff,
387 0x00ffff00,
388 0x00ffffff,
389 0xff000000,
390 0xff0000ff,
391 0xff00ff00,
392 0xff00ffff,
393 0xffff0000,
394 0xffff00ff,
395 0xffffff00,
396 0xffffffff
397};
398
399static unsigned int expand_bits_16[4] = {
400 0x00000000,
401 0x0000ffff,
402 0xffff0000,
403 0xffffffff
404};
405
406
407static void draw_byte_32(const unsigned char *font, unsigned int *base, int rb)
408{
409 int l, bits;
410 int fg = 0xFFFFFFFFUL;
411 int bg = 0x00000000UL;
412
413 for (l = 0; l < 16; ++l)
414 {
415 bits = *font++;
416 base[0] = (-(bits >> 7) & fg) ^ bg;
417 base[1] = (-((bits >> 6) & 1) & fg) ^ bg;
418 base[2] = (-((bits >> 5) & 1) & fg) ^ bg;
419 base[3] = (-((bits >> 4) & 1) & fg) ^ bg;
420 base[4] = (-((bits >> 3) & 1) & fg) ^ bg;
421 base[5] = (-((bits >> 2) & 1) & fg) ^ bg;
422 base[6] = (-((bits >> 1) & 1) & fg) ^ bg;
423 base[7] = (-(bits & 1) & fg) ^ bg;
424 base = (unsigned int *) ((char *)base + rb);
425 }
426}
427
428static inline void draw_byte_16(const unsigned char *font, unsigned int *base, int rb)
429{
430 int l, bits;
431 int fg = 0xFFFFFFFFUL;
432 int bg = 0x00000000UL;
433 unsigned int *eb = (int *)expand_bits_16;
434
435 for (l = 0; l < 16; ++l)
436 {
437 bits = *font++;
438 base[0] = (eb[bits >> 6] & fg) ^ bg;
439 base[1] = (eb[(bits >> 4) & 3] & fg) ^ bg;
440 base[2] = (eb[(bits >> 2) & 3] & fg) ^ bg;
441 base[3] = (eb[bits & 3] & fg) ^ bg;
442 base = (unsigned int *) ((char *)base + rb);
443 }
444}
445
446static inline void draw_byte_8(const unsigned char *font, unsigned int *base, int rb)
447{
448 int l, bits;
449 int fg = 0x0F0F0F0FUL;
450 int bg = 0x00000000UL;
451 unsigned int *eb = (int *)expand_bits_8;
452
453 for (l = 0; l < 16; ++l)
454 {
455 bits = *font++;
456 base[0] = (eb[bits >> 4] & fg) ^ bg;
457 base[1] = (eb[bits & 0xf] & fg) ^ bg;
458 base = (unsigned int *) ((char *)base + rb);
459 }
460}
461
462static noinline void draw_byte(unsigned char c, long locX, long locY)
463{
464 unsigned char *base = calc_base(locX << 3, locY << 4);
465 unsigned int font_index = c * 16;
466 const unsigned char *font = font_sun_8x16.data + font_index;
467 int rb = dispDeviceRowBytes;
468
469 rmci_maybe_on();
470 switch(dispDeviceDepth) {
471 case 24:
472 case 32:
473 draw_byte_32(font, (unsigned int *)base, rb);
474 break;
475 case 15:
476 case 16:
477 draw_byte_16(font, (unsigned int *)base, rb);
478 break;
479 case 8:
480 draw_byte_8(font, (unsigned int *)base, rb);
481 break;
482 }
483 rmci_maybe_off();
484}
485
486void btext_drawchar(char c)
487{
488 int cline = 0;
489#ifdef NO_SCROLL
490 int x;
491#endif
492 if (!boot_text_mapped)
493 return;
494
495 switch (c) {
496 case '\b':
497 if (g_loc_X > 0)
498 --g_loc_X;
499 break;
500 case '\t':
501 g_loc_X = (g_loc_X & -8) + 8;
502 break;
503 case '\r':
504 g_loc_X = 0;
505 break;
506 case '\n':
507 g_loc_X = 0;
508 g_loc_Y++;
509 cline = 1;
510 break;
511 default:
512 draw_byte(c, g_loc_X++, g_loc_Y);
513 }
514 if (g_loc_X >= g_max_loc_X) {
515 g_loc_X = 0;
516 g_loc_Y++;
517 cline = 1;
518 }
519#ifndef NO_SCROLL
520 while (g_loc_Y >= g_max_loc_Y) {
521 scrollscreen();
522 g_loc_Y--;
523 }
524#else
525 /* wrap around from bottom to top of screen so we don't
526 waste time scrolling each line. -- paulus. */
527 if (g_loc_Y >= g_max_loc_Y)
528 g_loc_Y = 0;
529 if (cline) {
530 for (x = 0; x < g_max_loc_X; ++x)
531 draw_byte(' ', x, g_loc_Y);
532 }
533#endif
534}
535
536void btext_drawstring(const char *c)
537{
538 if (!boot_text_mapped)
539 return;
540 while (*c)
541 btext_drawchar(*c++);
542}
543
544void __init btext_drawtext(const char *c, unsigned int len)
545{
546 if (!boot_text_mapped)
547 return;
548 while (len--)
549 btext_drawchar(*c++);
550}
551
552void __init btext_drawhex(unsigned long v)
553{
554 if (!boot_text_mapped)
555 return;
556#ifdef CONFIG_PPC64
557 btext_drawchar(hex_asc_hi(v >> 56));
558 btext_drawchar(hex_asc_lo(v >> 56));
559 btext_drawchar(hex_asc_hi(v >> 48));
560 btext_drawchar(hex_asc_lo(v >> 48));
561 btext_drawchar(hex_asc_hi(v >> 40));
562 btext_drawchar(hex_asc_lo(v >> 40));
563 btext_drawchar(hex_asc_hi(v >> 32));
564 btext_drawchar(hex_asc_lo(v >> 32));
565#endif
566 btext_drawchar(hex_asc_hi(v >> 24));
567 btext_drawchar(hex_asc_lo(v >> 24));
568 btext_drawchar(hex_asc_hi(v >> 16));
569 btext_drawchar(hex_asc_lo(v >> 16));
570 btext_drawchar(hex_asc_hi(v >> 8));
571 btext_drawchar(hex_asc_lo(v >> 8));
572 btext_drawchar(hex_asc_hi(v));
573 btext_drawchar(hex_asc_lo(v));
574 btext_drawchar(' ');
575}
576
577void __init udbg_init_btext(void)
578{
579 /* If btext is enabled, we might have a BAT setup for early display,
580 * thus we do enable some very basic udbg output
581 */
582 udbg_putc = btext_drawchar;
583}