vt8500lcdfb.c 12 KB

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  1. // SPDX-License-Identifier: GPL-2.0-only
  2. /*
  3. * linux/drivers/video/vt8500lcdfb.c
  4. *
  5. * Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
  6. *
  7. * Based on skeletonfb.c and pxafb.c
  8. */
  9. #include <linux/delay.h>
  10. #include <linux/dma-mapping.h>
  11. #include <linux/errno.h>
  12. #include <linux/fb.h>
  13. #include <linux/init.h>
  14. #include <linux/interrupt.h>
  15. #include <linux/io.h>
  16. #include <linux/kernel.h>
  17. #include <linux/mm.h>
  18. #include <linux/module.h>
  19. #include <linux/platform_device.h>
  20. #include <linux/slab.h>
  21. #include <linux/string.h>
  22. #include <linux/wait.h>
  23. #include <video/of_display_timing.h>
  24. #include "vt8500lcdfb.h"
  25. #include "wmt_ge_rops.h"
  26. #ifdef CONFIG_OF
  27. #include <linux/of.h>
  28. #include <linux/of_fdt.h>
  29. #include <linux/memblock.h>
  30. #endif
  31. #define to_vt8500lcd_info(__info) container_of(__info, \
  32. struct vt8500lcd_info, fb)
  33. static int vt8500lcd_set_par(struct fb_info *info)
  34. {
  35. struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
  36. int reg_bpp = 5; /* 16bpp */
  37. int i;
  38. unsigned long control0;
  39. if (!fbi)
  40. return -EINVAL;
  41. if (info->var.bits_per_pixel <= 8) {
  42. /* palettized */
  43. info->var.red.offset = 0;
  44. info->var.red.length = info->var.bits_per_pixel;
  45. info->var.red.msb_right = 0;
  46. info->var.green.offset = 0;
  47. info->var.green.length = info->var.bits_per_pixel;
  48. info->var.green.msb_right = 0;
  49. info->var.blue.offset = 0;
  50. info->var.blue.length = info->var.bits_per_pixel;
  51. info->var.blue.msb_right = 0;
  52. info->var.transp.offset = 0;
  53. info->var.transp.length = 0;
  54. info->var.transp.msb_right = 0;
  55. info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
  56. info->fix.line_length = info->var.xres_virtual /
  57. (8/info->var.bits_per_pixel);
  58. } else {
  59. /* non-palettized */
  60. info->var.transp.offset = 0;
  61. info->var.transp.length = 0;
  62. info->var.transp.msb_right = 0;
  63. if (info->var.bits_per_pixel == 16) {
  64. /* RGB565 */
  65. info->var.red.offset = 11;
  66. info->var.red.length = 5;
  67. info->var.red.msb_right = 0;
  68. info->var.green.offset = 5;
  69. info->var.green.length = 6;
  70. info->var.green.msb_right = 0;
  71. info->var.blue.offset = 0;
  72. info->var.blue.length = 5;
  73. info->var.blue.msb_right = 0;
  74. } else {
  75. /* Equal depths per channel */
  76. info->var.red.offset = info->var.bits_per_pixel
  77. * 2 / 3;
  78. info->var.red.length = info->var.bits_per_pixel / 3;
  79. info->var.red.msb_right = 0;
  80. info->var.green.offset = info->var.bits_per_pixel / 3;
  81. info->var.green.length = info->var.bits_per_pixel / 3;
  82. info->var.green.msb_right = 0;
  83. info->var.blue.offset = 0;
  84. info->var.blue.length = info->var.bits_per_pixel / 3;
  85. info->var.blue.msb_right = 0;
  86. }
  87. info->fix.visual = FB_VISUAL_TRUECOLOR;
  88. info->fix.line_length = info->var.bits_per_pixel > 16 ?
  89. info->var.xres_virtual << 2 :
  90. info->var.xres_virtual << 1;
  91. }
  92. for (i = 0; i < 8; i++) {
  93. if (bpp_values[i] == info->var.bits_per_pixel)
  94. reg_bpp = i;
  95. }
  96. control0 = readl(fbi->regbase) & ~0xf;
  97. writel(0, fbi->regbase);
  98. while (readl(fbi->regbase + 0x38) & 0x10)
  99. /* wait */;
  100. writel((((info->var.hsync_len - 1) & 0x3f) << 26)
  101. | ((info->var.left_margin & 0xff) << 18)
  102. | (((info->var.xres - 1) & 0x3ff) << 8)
  103. | (info->var.right_margin & 0xff), fbi->regbase + 0x4);
  104. writel((((info->var.vsync_len - 1) & 0x3f) << 26)
  105. | ((info->var.upper_margin & 0xff) << 18)
  106. | (((info->var.yres - 1) & 0x3ff) << 8)
  107. | (info->var.lower_margin & 0xff), fbi->regbase + 0x8);
  108. writel((((info->var.yres - 1) & 0x400) << 2)
  109. | ((info->var.xres - 1) & 0x400), fbi->regbase + 0x10);
  110. writel(0x80000000, fbi->regbase + 0x20);
  111. writel(control0 | (reg_bpp << 1) | 0x100, fbi->regbase);
  112. return 0;
  113. }
  114. static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
  115. {
  116. chan &= 0xffff;
  117. chan >>= 16 - bf->length;
  118. return chan << bf->offset;
  119. }
  120. static int vt8500lcd_setcolreg(unsigned regno, unsigned red, unsigned green,
  121. unsigned blue, unsigned transp,
  122. struct fb_info *info) {
  123. struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
  124. int ret = 1;
  125. unsigned int val;
  126. if (regno >= 256)
  127. return -EINVAL;
  128. if (info->var.grayscale)
  129. red = green = blue =
  130. (19595 * red + 38470 * green + 7471 * blue) >> 16;
  131. switch (fbi->fb.fix.visual) {
  132. case FB_VISUAL_TRUECOLOR:
  133. if (regno < 16) {
  134. u32 *pal = fbi->fb.pseudo_palette;
  135. val = chan_to_field(red, &fbi->fb.var.red);
  136. val |= chan_to_field(green, &fbi->fb.var.green);
  137. val |= chan_to_field(blue, &fbi->fb.var.blue);
  138. pal[regno] = val;
  139. ret = 0;
  140. }
  141. break;
  142. case FB_VISUAL_STATIC_PSEUDOCOLOR:
  143. case FB_VISUAL_PSEUDOCOLOR:
  144. writew((red & 0xf800)
  145. | ((green >> 5) & 0x7e0)
  146. | ((blue >> 11) & 0x1f),
  147. fbi->palette_cpu + sizeof(u16) * regno);
  148. break;
  149. }
  150. return ret;
  151. }
  152. static int vt8500lcd_ioctl(struct fb_info *info, unsigned int cmd,
  153. unsigned long arg)
  154. {
  155. int ret = 0;
  156. struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
  157. if (cmd == FBIO_WAITFORVSYNC) {
  158. /* Unmask End of Frame interrupt */
  159. writel(0xffffffff ^ (1 << 3), fbi->regbase + 0x3c);
  160. ret = wait_event_interruptible_timeout(fbi->wait,
  161. readl(fbi->regbase + 0x38) & (1 << 3), HZ / 10);
  162. /* Mask back to reduce unwanted interrupt traffic */
  163. writel(0xffffffff, fbi->regbase + 0x3c);
  164. if (ret < 0)
  165. return ret;
  166. if (ret == 0)
  167. return -ETIMEDOUT;
  168. }
  169. return ret;
  170. }
  171. static int vt8500lcd_pan_display(struct fb_var_screeninfo *var,
  172. struct fb_info *info)
  173. {
  174. unsigned pixlen = info->fix.line_length / info->var.xres_virtual;
  175. unsigned off = pixlen * var->xoffset
  176. + info->fix.line_length * var->yoffset;
  177. struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
  178. writel((1 << 31)
  179. | (((info->var.xres_virtual - info->var.xres) * pixlen / 4) << 20)
  180. | (off >> 2), fbi->regbase + 0x20);
  181. return 0;
  182. }
  183. /*
  184. * vt8500lcd_blank():
  185. * Blank the display by setting all palette values to zero. Note,
  186. * True Color modes do not really use the palette, so this will not
  187. * blank the display in all modes.
  188. */
  189. static int vt8500lcd_blank(int blank, struct fb_info *info)
  190. {
  191. int i;
  192. switch (blank) {
  193. case FB_BLANK_POWERDOWN:
  194. case FB_BLANK_VSYNC_SUSPEND:
  195. case FB_BLANK_HSYNC_SUSPEND:
  196. case FB_BLANK_NORMAL:
  197. if (info->fix.visual == FB_VISUAL_PSEUDOCOLOR ||
  198. info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR)
  199. for (i = 0; i < 256; i++)
  200. vt8500lcd_setcolreg(i, 0, 0, 0, 0, info);
  201. fallthrough;
  202. case FB_BLANK_UNBLANK:
  203. if (info->fix.visual == FB_VISUAL_PSEUDOCOLOR ||
  204. info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR)
  205. fb_set_cmap(&info->cmap, info);
  206. }
  207. return 0;
  208. }
  209. static const struct fb_ops vt8500lcd_ops = {
  210. .owner = THIS_MODULE,
  211. .fb_set_par = vt8500lcd_set_par,
  212. .fb_setcolreg = vt8500lcd_setcolreg,
  213. .fb_fillrect = wmt_ge_fillrect,
  214. .fb_copyarea = wmt_ge_copyarea,
  215. .fb_imageblit = sys_imageblit,
  216. .fb_sync = wmt_ge_sync,
  217. .fb_ioctl = vt8500lcd_ioctl,
  218. .fb_pan_display = vt8500lcd_pan_display,
  219. .fb_blank = vt8500lcd_blank,
  220. };
  221. static irqreturn_t vt8500lcd_handle_irq(int irq, void *dev_id)
  222. {
  223. struct vt8500lcd_info *fbi = dev_id;
  224. if (readl(fbi->regbase + 0x38) & (1 << 3))
  225. wake_up_interruptible(&fbi->wait);
  226. writel(0xffffffff, fbi->regbase + 0x38);
  227. return IRQ_HANDLED;
  228. }
  229. static int vt8500lcd_probe(struct platform_device *pdev)
  230. {
  231. struct vt8500lcd_info *fbi;
  232. struct resource *res;
  233. struct display_timings *disp_timing;
  234. void *addr;
  235. int irq, ret;
  236. struct fb_videomode of_mode;
  237. u32 bpp;
  238. dma_addr_t fb_mem_phys;
  239. unsigned long fb_mem_len;
  240. void *fb_mem_virt;
  241. ret = -ENOMEM;
  242. fbi = NULL;
  243. fbi = devm_kzalloc(&pdev->dev, sizeof(struct vt8500lcd_info)
  244. + sizeof(u32) * 16, GFP_KERNEL);
  245. if (!fbi)
  246. return -ENOMEM;
  247. strcpy(fbi->fb.fix.id, "VT8500 LCD");
  248. fbi->fb.fix.type = FB_TYPE_PACKED_PIXELS;
  249. fbi->fb.fix.xpanstep = 0;
  250. fbi->fb.fix.ypanstep = 1;
  251. fbi->fb.fix.ywrapstep = 0;
  252. fbi->fb.fix.accel = FB_ACCEL_NONE;
  253. fbi->fb.var.nonstd = 0;
  254. fbi->fb.var.activate = FB_ACTIVATE_NOW;
  255. fbi->fb.var.height = -1;
  256. fbi->fb.var.width = -1;
  257. fbi->fb.var.vmode = FB_VMODE_NONINTERLACED;
  258. fbi->fb.fbops = &vt8500lcd_ops;
  259. fbi->fb.flags = FBINFO_DEFAULT
  260. | FBINFO_HWACCEL_COPYAREA
  261. | FBINFO_HWACCEL_FILLRECT
  262. | FBINFO_HWACCEL_YPAN
  263. | FBINFO_VIRTFB
  264. | FBINFO_PARTIAL_PAN_OK;
  265. fbi->fb.node = -1;
  266. addr = fbi;
  267. addr = addr + sizeof(struct vt8500lcd_info);
  268. fbi->fb.pseudo_palette = addr;
  269. res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  270. if (res == NULL) {
  271. dev_err(&pdev->dev, "no I/O memory resource defined\n");
  272. return -ENODEV;
  273. }
  274. res = request_mem_region(res->start, resource_size(res), "vt8500lcd");
  275. if (res == NULL) {
  276. dev_err(&pdev->dev, "failed to request I/O memory\n");
  277. return -EBUSY;
  278. }
  279. fbi->regbase = ioremap(res->start, resource_size(res));
  280. if (fbi->regbase == NULL) {
  281. dev_err(&pdev->dev, "failed to map I/O memory\n");
  282. ret = -EBUSY;
  283. goto failed_free_res;
  284. }
  285. disp_timing = of_get_display_timings(pdev->dev.of_node);
  286. if (!disp_timing) {
  287. ret = -EINVAL;
  288. goto failed_free_io;
  289. }
  290. ret = of_get_fb_videomode(pdev->dev.of_node, &of_mode,
  291. OF_USE_NATIVE_MODE);
  292. if (ret)
  293. goto failed_free_io;
  294. ret = of_property_read_u32(pdev->dev.of_node, "bits-per-pixel", &bpp);
  295. if (ret)
  296. goto failed_free_io;
  297. /* try allocating the framebuffer */
  298. fb_mem_len = of_mode.xres * of_mode.yres * 2 * (bpp / 8);
  299. fb_mem_virt = dma_alloc_coherent(&pdev->dev, fb_mem_len, &fb_mem_phys,
  300. GFP_KERNEL);
  301. if (!fb_mem_virt) {
  302. pr_err("%s: Failed to allocate framebuffer\n", __func__);
  303. ret = -ENOMEM;
  304. goto failed_free_io;
  305. }
  306. fbi->fb.fix.smem_start = fb_mem_phys;
  307. fbi->fb.fix.smem_len = fb_mem_len;
  308. fbi->fb.screen_base = fb_mem_virt;
  309. fbi->palette_size = PAGE_ALIGN(512);
  310. fbi->palette_cpu = dma_alloc_coherent(&pdev->dev,
  311. fbi->palette_size,
  312. &fbi->palette_phys,
  313. GFP_KERNEL);
  314. if (fbi->palette_cpu == NULL) {
  315. dev_err(&pdev->dev, "Failed to allocate palette buffer\n");
  316. ret = -ENOMEM;
  317. goto failed_free_io;
  318. }
  319. irq = platform_get_irq(pdev, 0);
  320. if (irq < 0) {
  321. dev_err(&pdev->dev, "no IRQ defined\n");
  322. ret = -ENODEV;
  323. goto failed_free_palette;
  324. }
  325. ret = request_irq(irq, vt8500lcd_handle_irq, 0, "LCD", fbi);
  326. if (ret) {
  327. dev_err(&pdev->dev, "request_irq failed: %d\n", ret);
  328. ret = -EBUSY;
  329. goto failed_free_palette;
  330. }
  331. init_waitqueue_head(&fbi->wait);
  332. if (fb_alloc_cmap(&fbi->fb.cmap, 256, 0) < 0) {
  333. dev_err(&pdev->dev, "Failed to allocate color map\n");
  334. ret = -ENOMEM;
  335. goto failed_free_irq;
  336. }
  337. fb_videomode_to_var(&fbi->fb.var, &of_mode);
  338. fbi->fb.var.xres_virtual = of_mode.xres;
  339. fbi->fb.var.yres_virtual = of_mode.yres * 2;
  340. fbi->fb.var.bits_per_pixel = bpp;
  341. ret = vt8500lcd_set_par(&fbi->fb);
  342. if (ret) {
  343. dev_err(&pdev->dev, "Failed to set parameters\n");
  344. goto failed_free_cmap;
  345. }
  346. writel(fbi->fb.fix.smem_start >> 22, fbi->regbase + 0x1c);
  347. writel((fbi->palette_phys & 0xfffffe00) | 1, fbi->regbase + 0x18);
  348. platform_set_drvdata(pdev, fbi);
  349. ret = register_framebuffer(&fbi->fb);
  350. if (ret < 0) {
  351. dev_err(&pdev->dev,
  352. "Failed to register framebuffer device: %d\n", ret);
  353. goto failed_free_cmap;
  354. }
  355. /*
  356. * Ok, now enable the LCD controller
  357. */
  358. writel(readl(fbi->regbase) | 1, fbi->regbase);
  359. return 0;
  360. failed_free_cmap:
  361. if (fbi->fb.cmap.len)
  362. fb_dealloc_cmap(&fbi->fb.cmap);
  363. failed_free_irq:
  364. free_irq(irq, fbi);
  365. failed_free_palette:
  366. dma_free_coherent(&pdev->dev, fbi->palette_size,
  367. fbi->palette_cpu, fbi->palette_phys);
  368. failed_free_io:
  369. iounmap(fbi->regbase);
  370. failed_free_res:
  371. release_mem_region(res->start, resource_size(res));
  372. return ret;
  373. }
  374. static int vt8500lcd_remove(struct platform_device *pdev)
  375. {
  376. struct vt8500lcd_info *fbi = platform_get_drvdata(pdev);
  377. struct resource *res;
  378. int irq;
  379. unregister_framebuffer(&fbi->fb);
  380. writel(0, fbi->regbase);
  381. if (fbi->fb.cmap.len)
  382. fb_dealloc_cmap(&fbi->fb.cmap);
  383. irq = platform_get_irq(pdev, 0);
  384. free_irq(irq, fbi);
  385. dma_free_coherent(&pdev->dev, fbi->palette_size,
  386. fbi->palette_cpu, fbi->palette_phys);
  387. iounmap(fbi->regbase);
  388. res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  389. release_mem_region(res->start, resource_size(res));
  390. return 0;
  391. }
  392. static const struct of_device_id via_dt_ids[] = {
  393. { .compatible = "via,vt8500-fb", },
  394. {}
  395. };
  396. static struct platform_driver vt8500lcd_driver = {
  397. .probe = vt8500lcd_probe,
  398. .remove = vt8500lcd_remove,
  399. .driver = {
  400. .name = "vt8500-lcd",
  401. .of_match_table = of_match_ptr(via_dt_ids),
  402. },
  403. };
  404. module_platform_driver(vt8500lcd_driver);
  405. MODULE_AUTHOR("Alexey Charkov <alchark@gmail.com>");
  406. MODULE_DESCRIPTION("LCD controller driver for VIA VT8500");
  407. MODULE_LICENSE("GPL v2");
  408. MODULE_DEVICE_TABLE(of, via_dt_ids);