valkyriefb.c 16 KB

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  1. /*
  2. * valkyriefb.c -- frame buffer device for the PowerMac 'valkyrie' display
  3. *
  4. * Created 8 August 1998 by
  5. * Martin Costabel <costabel@wanadoo.fr> and Kevin Schoedel
  6. *
  7. * Vmode-switching changes and vmode 15/17 modifications created 29 August
  8. * 1998 by Barry K. Nathan <barryn@pobox.com>.
  9. *
  10. * Ported to m68k Macintosh by David Huggins-Daines <dhd@debian.org>
  11. *
  12. * Derived directly from:
  13. *
  14. * controlfb.c -- frame buffer device for the PowerMac 'control' display
  15. * Copyright (C) 1998 Dan Jacobowitz <dan@debian.org>
  16. *
  17. * pmc-valkyrie.c -- Console support for PowerMac "valkyrie" display adaptor.
  18. * Copyright (C) 1997 Paul Mackerras.
  19. *
  20. * and indirectly:
  21. *
  22. * Frame buffer structure from:
  23. * drivers/video/chipsfb.c -- frame buffer device for
  24. * Chips & Technologies 65550 chip.
  25. *
  26. * Copyright (C) 1998 Paul Mackerras
  27. *
  28. * This file is derived from the Powermac "chips" driver:
  29. * Copyright (C) 1997 Fabio Riccardi.
  30. * And from the frame buffer device for Open Firmware-initialized devices:
  31. * Copyright (C) 1997 Geert Uytterhoeven.
  32. *
  33. * Hardware information from:
  34. * control.c: Console support for PowerMac "control" display adaptor.
  35. * Copyright (C) 1996 Paul Mackerras
  36. *
  37. * This file is subject to the terms and conditions of the GNU General Public
  38. * License. See the file COPYING in the main directory of this archive for
  39. * more details.
  40. */
  41. #include <linux/module.h>
  42. #include <linux/kernel.h>
  43. #include <linux/errno.h>
  44. #include <linux/string.h>
  45. #include <linux/mm.h>
  46. #include <linux/slab.h>
  47. #include <linux/vmalloc.h>
  48. #include <linux/delay.h>
  49. #include <linux/interrupt.h>
  50. #include <linux/fb.h>
  51. #include <linux/selection.h>
  52. #include <linux/init.h>
  53. #include <linux/pci.h>
  54. #include <linux/nvram.h>
  55. #include <linux/adb.h>
  56. #include <linux/cuda.h>
  57. #include <asm/io.h>
  58. #ifdef CONFIG_MAC
  59. #include <asm/bootinfo.h>
  60. #include <asm/macintosh.h>
  61. #else
  62. #include <asm/prom.h>
  63. #endif
  64. #include <asm/pgtable.h>
  65. #include "macmodes.h"
  66. #include "valkyriefb.h"
  67. #ifdef CONFIG_MAC
  68. /* We don't yet have functions to read the PRAM... perhaps we can
  69. adapt them from the PPC code? */
  70. static int default_vmode = VMODE_640_480_67;
  71. static int default_cmode = CMODE_8;
  72. #else
  73. static int default_vmode = VMODE_NVRAM;
  74. static int default_cmode = CMODE_NVRAM;
  75. #endif
  76. struct fb_par_valkyrie {
  77. int vmode, cmode;
  78. int xres, yres;
  79. int vxres, vyres;
  80. struct valkyrie_regvals *init;
  81. };
  82. struct fb_info_valkyrie {
  83. struct fb_info info;
  84. struct fb_par_valkyrie par;
  85. struct cmap_regs __iomem *cmap_regs;
  86. unsigned long cmap_regs_phys;
  87. struct valkyrie_regs __iomem *valkyrie_regs;
  88. unsigned long valkyrie_regs_phys;
  89. __u8 __iomem *frame_buffer;
  90. unsigned long frame_buffer_phys;
  91. int sense;
  92. unsigned long total_vram;
  93. u32 pseudo_palette[16];
  94. };
  95. /*
  96. * Exported functions
  97. */
  98. int valkyriefb_init(void);
  99. int valkyriefb_setup(char*);
  100. static int valkyriefb_check_var(struct fb_var_screeninfo *var,
  101. struct fb_info *info);
  102. static int valkyriefb_set_par(struct fb_info *info);
  103. static int valkyriefb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
  104. u_int transp, struct fb_info *info);
  105. static int valkyriefb_blank(int blank_mode, struct fb_info *info);
  106. static int read_valkyrie_sense(struct fb_info_valkyrie *p);
  107. static void set_valkyrie_clock(unsigned char *params);
  108. static int valkyrie_var_to_par(struct fb_var_screeninfo *var,
  109. struct fb_par_valkyrie *par, const struct fb_info *fb_info);
  110. static void valkyrie_init_info(struct fb_info *info, struct fb_info_valkyrie *p);
  111. static void valkyrie_par_to_fix(struct fb_par_valkyrie *par, struct fb_fix_screeninfo *fix);
  112. static void valkyrie_init_fix(struct fb_fix_screeninfo *fix, struct fb_info_valkyrie *p);
  113. static struct fb_ops valkyriefb_ops = {
  114. .owner = THIS_MODULE,
  115. .fb_check_var = valkyriefb_check_var,
  116. .fb_set_par = valkyriefb_set_par,
  117. .fb_setcolreg = valkyriefb_setcolreg,
  118. .fb_blank = valkyriefb_blank,
  119. .fb_fillrect = cfb_fillrect,
  120. .fb_copyarea = cfb_copyarea,
  121. .fb_imageblit = cfb_imageblit,
  122. };
  123. /* Sets the video mode according to info->var */
  124. static int valkyriefb_set_par(struct fb_info *info)
  125. {
  126. struct fb_info_valkyrie *p = (struct fb_info_valkyrie *) info;
  127. volatile struct valkyrie_regs __iomem *valkyrie_regs = p->valkyrie_regs;
  128. struct fb_par_valkyrie *par = info->par;
  129. struct valkyrie_regvals *init;
  130. int err;
  131. if ((err = valkyrie_var_to_par(&info->var, par, info)))
  132. return err;
  133. valkyrie_par_to_fix(par, &info->fix);
  134. /* Reset the valkyrie */
  135. out_8(&valkyrie_regs->status.r, 0);
  136. udelay(100);
  137. /* Initialize display timing registers */
  138. init = par->init;
  139. out_8(&valkyrie_regs->mode.r, init->mode | 0x80);
  140. out_8(&valkyrie_regs->depth.r, par->cmode + 3);
  141. set_valkyrie_clock(init->clock_params);
  142. udelay(100);
  143. /* Turn on display */
  144. out_8(&valkyrie_regs->mode.r, init->mode);
  145. return 0;
  146. }
  147. static inline int valkyrie_par_to_var(struct fb_par_valkyrie *par,
  148. struct fb_var_screeninfo *var)
  149. {
  150. return mac_vmode_to_var(par->vmode, par->cmode, var);
  151. }
  152. static int
  153. valkyriefb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
  154. {
  155. int err;
  156. struct fb_par_valkyrie par;
  157. if ((err = valkyrie_var_to_par(var, &par, info)))
  158. return err;
  159. valkyrie_par_to_var(&par, var);
  160. return 0;
  161. }
  162. /*
  163. * Blank the screen if blank_mode != 0, else unblank. If blank_mode == NULL
  164. * then the caller blanks by setting the CLUT (Color Look Up Table) to all
  165. * black. Return 0 if blanking succeeded, != 0 if un-/blanking failed due
  166. * to e.g. a video mode which doesn't support it. Implements VESA suspend
  167. * and powerdown modes on hardware that supports disabling hsync/vsync:
  168. * blank_mode == 2: suspend vsync
  169. * blank_mode == 3: suspend hsync
  170. * blank_mode == 4: powerdown
  171. */
  172. static int valkyriefb_blank(int blank_mode, struct fb_info *info)
  173. {
  174. struct fb_info_valkyrie *p = (struct fb_info_valkyrie *) info;
  175. struct fb_par_valkyrie *par = info->par;
  176. struct valkyrie_regvals *init = par->init;
  177. if (init == NULL)
  178. return 1;
  179. switch (blank_mode) {
  180. case FB_BLANK_UNBLANK: /* unblank */
  181. out_8(&p->valkyrie_regs->mode.r, init->mode);
  182. break;
  183. case FB_BLANK_NORMAL:
  184. return 1; /* get caller to set CLUT to all black */
  185. case FB_BLANK_VSYNC_SUSPEND:
  186. case FB_BLANK_HSYNC_SUSPEND:
  187. /*
  188. * [kps] Value extracted from MacOS. I don't know
  189. * whether this bit disables hsync or vsync, or
  190. * whether the hardware can do the other as well.
  191. */
  192. out_8(&p->valkyrie_regs->mode.r, init->mode | 0x40);
  193. break;
  194. case FB_BLANK_POWERDOWN:
  195. out_8(&p->valkyrie_regs->mode.r, 0x66);
  196. break;
  197. }
  198. return 0;
  199. }
  200. static int valkyriefb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
  201. u_int transp, struct fb_info *info)
  202. {
  203. struct fb_info_valkyrie *p = (struct fb_info_valkyrie *) info;
  204. volatile struct cmap_regs __iomem *cmap_regs = p->cmap_regs;
  205. struct fb_par_valkyrie *par = info->par;
  206. if (regno > 255)
  207. return 1;
  208. red >>= 8;
  209. green >>= 8;
  210. blue >>= 8;
  211. /* tell clut which address to fill */
  212. out_8(&p->cmap_regs->addr, regno);
  213. udelay(1);
  214. /* send one color channel at a time */
  215. out_8(&cmap_regs->lut, red);
  216. out_8(&cmap_regs->lut, green);
  217. out_8(&cmap_regs->lut, blue);
  218. if (regno < 16 && par->cmode == CMODE_16)
  219. ((u32 *)info->pseudo_palette)[regno] =
  220. (regno << 10) | (regno << 5) | regno;
  221. return 0;
  222. }
  223. static inline int valkyrie_vram_reqd(int video_mode, int color_mode)
  224. {
  225. int pitch;
  226. struct valkyrie_regvals *init = valkyrie_reg_init[video_mode-1];
  227. if ((pitch = init->pitch[color_mode]) == 0)
  228. pitch = 2 * init->pitch[0];
  229. return init->vres * pitch;
  230. }
  231. static void set_valkyrie_clock(unsigned char *params)
  232. {
  233. struct adb_request req;
  234. int i;
  235. #ifdef CONFIG_ADB_CUDA
  236. for (i = 0; i < 3; ++i) {
  237. cuda_request(&req, NULL, 5, CUDA_PACKET, CUDA_GET_SET_IIC,
  238. 0x50, i + 1, params[i]);
  239. while (!req.complete)
  240. cuda_poll();
  241. }
  242. #endif
  243. }
  244. static void __init valkyrie_choose_mode(struct fb_info_valkyrie *p)
  245. {
  246. p->sense = read_valkyrie_sense(p);
  247. printk(KERN_INFO "Monitor sense value = 0x%x\n", p->sense);
  248. /* Try to pick a video mode out of NVRAM if we have one. */
  249. #if !defined(CONFIG_MAC) && defined(CONFIG_NVRAM)
  250. if (default_vmode == VMODE_NVRAM) {
  251. default_vmode = nvram_read_byte(NV_VMODE);
  252. if (default_vmode <= 0
  253. || default_vmode > VMODE_MAX
  254. || !valkyrie_reg_init[default_vmode - 1])
  255. default_vmode = VMODE_CHOOSE;
  256. }
  257. #endif
  258. if (default_vmode == VMODE_CHOOSE)
  259. default_vmode = mac_map_monitor_sense(p->sense);
  260. if (!valkyrie_reg_init[default_vmode - 1])
  261. default_vmode = VMODE_640_480_67;
  262. #if !defined(CONFIG_MAC) && defined(CONFIG_NVRAM)
  263. if (default_cmode == CMODE_NVRAM)
  264. default_cmode = nvram_read_byte(NV_CMODE);
  265. #endif
  266. /*
  267. * Reduce the pixel size if we don't have enough VRAM or bandwidth.
  268. */
  269. if (default_cmode < CMODE_8 || default_cmode > CMODE_16
  270. || valkyrie_reg_init[default_vmode-1]->pitch[default_cmode] == 0
  271. || valkyrie_vram_reqd(default_vmode, default_cmode) > p->total_vram)
  272. default_cmode = CMODE_8;
  273. printk(KERN_INFO "using video mode %d and color mode %d.\n",
  274. default_vmode, default_cmode);
  275. }
  276. int __init valkyriefb_init(void)
  277. {
  278. struct fb_info_valkyrie *p;
  279. unsigned long frame_buffer_phys, cmap_regs_phys, flags;
  280. int err;
  281. char *option = NULL;
  282. if (fb_get_options("valkyriefb", &option))
  283. return -ENODEV;
  284. valkyriefb_setup(option);
  285. #ifdef CONFIG_MAC
  286. if (!MACH_IS_MAC)
  287. return 0;
  288. if (!(mac_bi_data.id == MAC_MODEL_Q630
  289. /* I'm not sure about this one */
  290. || mac_bi_data.id == MAC_MODEL_P588))
  291. return 0;
  292. /* Hardcoded addresses... welcome to 68k Macintosh country :-) */
  293. frame_buffer_phys = 0xf9000000;
  294. cmap_regs_phys = 0x50f24000;
  295. flags = IOMAP_NOCACHE_SER; /* IOMAP_WRITETHROUGH?? */
  296. #else /* ppc (!CONFIG_MAC) */
  297. {
  298. struct device_node *dp;
  299. struct resource r;
  300. dp = of_find_node_by_name(NULL, "valkyrie");
  301. if (dp == 0)
  302. return 0;
  303. if (of_address_to_resource(dp, 0, &r)) {
  304. printk(KERN_ERR "can't find address for valkyrie\n");
  305. return 0;
  306. }
  307. frame_buffer_phys = r.start;
  308. cmap_regs_phys = r.start + 0x304000;
  309. flags = _PAGE_WRITETHRU;
  310. }
  311. #endif /* ppc (!CONFIG_MAC) */
  312. p = kmalloc(sizeof(*p), GFP_ATOMIC);
  313. if (p == 0)
  314. return -ENOMEM;
  315. memset(p, 0, sizeof(*p));
  316. /* Map in frame buffer and registers */
  317. if (!request_mem_region(frame_buffer_phys, 0x100000, "valkyriefb")) {
  318. kfree(p);
  319. return 0;
  320. }
  321. p->total_vram = 0x100000;
  322. p->frame_buffer_phys = frame_buffer_phys;
  323. p->frame_buffer = __ioremap(frame_buffer_phys, p->total_vram, flags);
  324. p->cmap_regs_phys = cmap_regs_phys;
  325. p->cmap_regs = ioremap(p->cmap_regs_phys, 0x1000);
  326. p->valkyrie_regs_phys = cmap_regs_phys+0x6000;
  327. p->valkyrie_regs = ioremap(p->valkyrie_regs_phys, 0x1000);
  328. err = -ENOMEM;
  329. if (p->frame_buffer == NULL || p->cmap_regs == NULL
  330. || p->valkyrie_regs == NULL) {
  331. printk(KERN_ERR "valkyriefb: couldn't map resources\n");
  332. goto out_free;
  333. }
  334. valkyrie_choose_mode(p);
  335. mac_vmode_to_var(default_vmode, default_cmode, &p->info.var);
  336. valkyrie_init_info(&p->info, p);
  337. valkyrie_init_fix(&p->info.fix, p);
  338. if (valkyriefb_set_par(&p->info))
  339. /* "can't happen" */
  340. printk(KERN_ERR "valkyriefb: can't set default video mode\n");
  341. if ((err = register_framebuffer(&p->info)) != 0)
  342. goto out_free;
  343. printk(KERN_INFO "fb%d: valkyrie frame buffer device\n", p->info.node);
  344. return 0;
  345. out_free:
  346. if (p->frame_buffer)
  347. iounmap(p->frame_buffer);
  348. if (p->cmap_regs)
  349. iounmap(p->cmap_regs);
  350. if (p->valkyrie_regs)
  351. iounmap(p->valkyrie_regs);
  352. kfree(p);
  353. return err;
  354. }
  355. /*
  356. * Get the monitor sense value.
  357. */
  358. static int read_valkyrie_sense(struct fb_info_valkyrie *p)
  359. {
  360. int sense, in;
  361. out_8(&p->valkyrie_regs->msense.r, 0); /* release all lines */
  362. __delay(20000);
  363. sense = ((in = in_8(&p->valkyrie_regs->msense.r)) & 0x70) << 4;
  364. /* drive each sense line low in turn and collect the other 2 */
  365. out_8(&p->valkyrie_regs->msense.r, 4); /* drive A low */
  366. __delay(20000);
  367. sense |= ((in = in_8(&p->valkyrie_regs->msense.r)) & 0x30);
  368. out_8(&p->valkyrie_regs->msense.r, 2); /* drive B low */
  369. __delay(20000);
  370. sense |= ((in = in_8(&p->valkyrie_regs->msense.r)) & 0x40) >> 3;
  371. sense |= (in & 0x10) >> 2;
  372. out_8(&p->valkyrie_regs->msense.r, 1); /* drive C low */
  373. __delay(20000);
  374. sense |= ((in = in_8(&p->valkyrie_regs->msense.r)) & 0x60) >> 5;
  375. out_8(&p->valkyrie_regs->msense.r, 7);
  376. return sense;
  377. }
  378. /*
  379. * This routine takes a user-supplied var,
  380. * and picks the best vmode/cmode from it.
  381. */
  382. /* [bkn] I did a major overhaul of this function.
  383. *
  384. * Much of the old code was "swiped by jonh from atyfb.c". Because
  385. * macmodes has mac_var_to_vmode, I felt that it would be better to
  386. * rework this function to use that, instead of reinventing the wheel to
  387. * add support for vmode 17. This was reinforced by the fact that
  388. * the previously swiped atyfb.c code is no longer there.
  389. *
  390. * So, I swiped and adapted platinum_var_to_par (from platinumfb.c), replacing
  391. * most, but not all, of the old code in the process. One side benefit of
  392. * swiping the platinumfb code is that we now have more comprehensible error
  393. * messages when a vmode/cmode switch fails. (Most of the error messages are
  394. * platinumfb.c, but I added two of my own, and I also changed some commas
  395. * into colons to make the messages more consistent with other Linux error
  396. * messages.) In addition, I think the new code *might* fix some vmode-
  397. * switching oddities, but I'm not sure.
  398. *
  399. * There may be some more opportunities for cleanup in here, but this is a
  400. * good start...
  401. */
  402. static int valkyrie_var_to_par(struct fb_var_screeninfo *var,
  403. struct fb_par_valkyrie *par, const struct fb_info *fb_info)
  404. {
  405. int vmode, cmode;
  406. struct valkyrie_regvals *init;
  407. struct fb_info_valkyrie *p = (struct fb_info_valkyrie *) fb_info;
  408. if (mac_var_to_vmode(var, &vmode, &cmode) != 0) {
  409. printk(KERN_ERR "valkyriefb: can't do %dx%dx%d.\n",
  410. var->xres, var->yres, var->bits_per_pixel);
  411. return -EINVAL;
  412. }
  413. /* Check if we know about the wanted video mode */
  414. if (vmode < 1 || vmode > VMODE_MAX || !valkyrie_reg_init[vmode-1]) {
  415. printk(KERN_ERR "valkyriefb: vmode %d not valid.\n", vmode);
  416. return -EINVAL;
  417. }
  418. if (cmode != CMODE_8 && cmode != CMODE_16) {
  419. printk(KERN_ERR "valkyriefb: cmode %d not valid.\n", cmode);
  420. return -EINVAL;
  421. }
  422. if (var->xres_virtual > var->xres || var->yres_virtual > var->yres
  423. || var->xoffset != 0 || var->yoffset != 0) {
  424. return -EINVAL;
  425. }
  426. init = valkyrie_reg_init[vmode-1];
  427. if (init->pitch[cmode] == 0) {
  428. printk(KERN_ERR "valkyriefb: vmode %d does not support "
  429. "cmode %d.\n", vmode, cmode);
  430. return -EINVAL;
  431. }
  432. if (valkyrie_vram_reqd(vmode, cmode) > p->total_vram) {
  433. printk(KERN_ERR "valkyriefb: not enough ram for vmode %d, "
  434. "cmode %d.\n", vmode, cmode);
  435. return -EINVAL;
  436. }
  437. par->vmode = vmode;
  438. par->cmode = cmode;
  439. par->init = init;
  440. par->xres = var->xres;
  441. par->yres = var->yres;
  442. par->vxres = par->xres;
  443. par->vyres = par->yres;
  444. return 0;
  445. }
  446. static void valkyrie_init_fix(struct fb_fix_screeninfo *fix, struct fb_info_valkyrie *p)
  447. {
  448. memset(fix, 0, sizeof(*fix));
  449. strcpy(fix->id, "valkyrie");
  450. fix->mmio_start = p->valkyrie_regs_phys;
  451. fix->mmio_len = sizeof(struct valkyrie_regs);
  452. fix->type = FB_TYPE_PACKED_PIXELS;
  453. fix->smem_start = p->frame_buffer_phys + 0x1000;
  454. fix->smem_len = p->total_vram;
  455. fix->type_aux = 0;
  456. fix->ywrapstep = 0;
  457. fix->ypanstep = 0;
  458. fix->xpanstep = 0;
  459. }
  460. /* Fix must already be inited above */
  461. static void valkyrie_par_to_fix(struct fb_par_valkyrie *par,
  462. struct fb_fix_screeninfo *fix)
  463. {
  464. fix->smem_len = valkyrie_vram_reqd(par->vmode, par->cmode);
  465. fix->visual = (par->cmode == CMODE_8) ?
  466. FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_DIRECTCOLOR;
  467. fix->line_length = par->vxres << par->cmode;
  468. /* ywrapstep, xpanstep, ypanstep */
  469. }
  470. static void __init valkyrie_init_info(struct fb_info *info, struct fb_info_valkyrie *p)
  471. {
  472. info->fbops = &valkyriefb_ops;
  473. info->screen_base = p->frame_buffer + 0x1000;
  474. info->flags = FBINFO_DEFAULT;
  475. info->pseudo_palette = p->pseudo_palette;
  476. fb_alloc_cmap(&info->cmap, 256, 0);
  477. info->par = &p->par;
  478. }
  479. /*
  480. * Parse user speficied options (`video=valkyriefb:')
  481. */
  482. int __init valkyriefb_setup(char *options)
  483. {
  484. char *this_opt;
  485. if (!options || !*options)
  486. return 0;
  487. while ((this_opt = strsep(&options, ",")) != NULL) {
  488. if (!strncmp(this_opt, "vmode:", 6)) {
  489. int vmode = simple_strtoul(this_opt+6, NULL, 0);
  490. if (vmode > 0 && vmode <= VMODE_MAX)
  491. default_vmode = vmode;
  492. }
  493. else if (!strncmp(this_opt, "cmode:", 6)) {
  494. int depth = simple_strtoul(this_opt+6, NULL, 0);
  495. switch (depth) {
  496. case 8:
  497. default_cmode = CMODE_8;
  498. break;
  499. case 15:
  500. case 16:
  501. default_cmode = CMODE_16;
  502. break;
  503. }
  504. }
  505. }
  506. return 0;
  507. }
  508. module_init(valkyriefb_init);
  509. MODULE_LICENSE("GPL");