1 // SPDX-License-Identifier: GPL-2.0-only
2 /* tcx.c: TCX frame buffer driver
4 * Copyright (C) 2003, 2006 David S. Miller (davem@davemloft.net)
5 * Copyright (C) 1996,1998 Jakub Jelinek (jj@ultra.linux.cz)
6 * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
7 * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
9 * Driver layout based loosely on tgafb.c, see that file for credits.
12 #include <linux/module.h>
13 #include <linux/kernel.h>
14 #include <linux/errno.h>
15 #include <linux/string.h>
16 #include <linux/delay.h>
17 #include <linux/init.h>
21 #include <linux/platform_device.h>
32 static int tcx_setcolreg(unsigned, unsigned, unsigned, unsigned,
33 unsigned, struct fb_info *);
34 static int tcx_blank(int, struct fb_info *);
36 static int tcx_mmap(struct fb_info *, struct vm_area_struct *);
37 static int tcx_ioctl(struct fb_info *, unsigned int, unsigned long);
38 static int tcx_pan_display(struct fb_var_screeninfo *, struct fb_info *);
41 * Frame buffer operations
44 static const struct fb_ops tcx_ops = {
46 .fb_setcolreg = tcx_setcolreg,
47 .fb_blank = tcx_blank,
48 .fb_pan_display = tcx_pan_display,
49 .fb_fillrect = cfb_fillrect,
50 .fb_copyarea = cfb_copyarea,
51 .fb_imageblit = cfb_imageblit,
53 .fb_ioctl = tcx_ioctl,
55 .fb_compat_ioctl = sbusfb_compat_ioctl,
60 #define TCX_THC_MISC_REV_SHIFT 16
61 #define TCX_THC_MISC_REV_MASK 15
62 #define TCX_THC_MISC_VSYNC_DIS (1 << 25)
63 #define TCX_THC_MISC_HSYNC_DIS (1 << 24)
64 #define TCX_THC_MISC_RESET (1 << 12)
65 #define TCX_THC_MISC_VIDEO (1 << 10)
66 #define TCX_THC_MISC_SYNC (1 << 9)
67 #define TCX_THC_MISC_VSYNC (1 << 8)
68 #define TCX_THC_MISC_SYNC_ENAB (1 << 7)
69 #define TCX_THC_MISC_CURS_RES (1 << 6)
70 #define TCX_THC_MISC_INT_ENAB (1 << 5)
71 #define TCX_THC_MISC_INT (1 << 4)
72 #define TCX_THC_MISC_INIT 0x9f
73 #define TCX_THC_REV_REV_SHIFT 20
74 #define TCX_THC_REV_REV_MASK 15
75 #define TCX_THC_REV_MINREV_SHIFT 28
76 #define TCX_THC_REV_MINREV_MASK 15
78 /* The contents are unknown */
88 u32 thc_hs; /* hsync timing */
91 u32 thc_vs; /* vsync timing */
96 u32 thc_cursxy; /* cursor x,y position (16 bits each) */
97 u32 thc_cursmask[32]; /* cursor mask bits */
98 u32 thc_cursbits[32]; /* what to show where mask enabled */
108 #define TCX_MMAP_ENTRIES 14
112 struct bt_regs __iomem *bt;
113 struct tcx_thc __iomem *thc;
114 struct tcx_tec __iomem *tec;
118 #define TCX_FLAG_BLANKED 0x00000001
120 unsigned long which_io;
122 struct sbus_mmap_map mmap_map[TCX_MMAP_ENTRIES];
126 /* Reset control plane so that WID is 8-bit plane. */
127 static void __tcx_set_control_plane(struct fb_info *info)
129 struct tcx_par *par = info->par;
130 u32 __iomem *p, *pend;
138 for (pend = p + info->fix.smem_len; p < pend; p++) {
139 u32 tmp = sbus_readl(p);
146 static void tcx_reset(struct fb_info *info)
148 struct tcx_par *par = (struct tcx_par *) info->par;
151 spin_lock_irqsave(&par->lock, flags);
152 __tcx_set_control_plane(info);
153 spin_unlock_irqrestore(&par->lock, flags);
156 static int tcx_pan_display(struct fb_var_screeninfo *var, struct fb_info *info)
163 * tcx_setcolreg - Optional function. Sets a color register.
164 * @regno: boolean, 0 copy local, 1 get_user() function
165 * @red: frame buffer colormap structure
166 * @green: The green value which can be up to 16 bits wide
167 * @blue: The blue value which can be up to 16 bits wide.
168 * @transp: If supported the alpha value which can be up to 16 bits wide.
169 * @info: frame buffer info structure
171 static int tcx_setcolreg(unsigned regno,
172 unsigned red, unsigned green, unsigned blue,
173 unsigned transp, struct fb_info *info)
175 struct tcx_par *par = (struct tcx_par *) info->par;
176 struct bt_regs __iomem *bt = par->bt;
186 spin_lock_irqsave(&par->lock, flags);
188 sbus_writel(regno << 24, &bt->addr);
189 sbus_writel(red << 24, &bt->color_map);
190 sbus_writel(green << 24, &bt->color_map);
191 sbus_writel(blue << 24, &bt->color_map);
193 spin_unlock_irqrestore(&par->lock, flags);
199 * tcx_blank - Optional function. Blanks the display.
200 * @blank: the blank mode we want.
201 * @info: frame buffer structure that represents a single frame buffer
204 tcx_blank(int blank, struct fb_info *info)
206 struct tcx_par *par = (struct tcx_par *) info->par;
207 struct tcx_thc __iomem *thc = par->thc;
211 spin_lock_irqsave(&par->lock, flags);
213 val = sbus_readl(&thc->thc_misc);
216 case FB_BLANK_UNBLANK: /* Unblanking */
217 val &= ~(TCX_THC_MISC_VSYNC_DIS |
218 TCX_THC_MISC_HSYNC_DIS);
219 val |= TCX_THC_MISC_VIDEO;
220 par->flags &= ~TCX_FLAG_BLANKED;
223 case FB_BLANK_NORMAL: /* Normal blanking */
224 val &= ~TCX_THC_MISC_VIDEO;
225 par->flags |= TCX_FLAG_BLANKED;
228 case FB_BLANK_VSYNC_SUSPEND: /* VESA blank (vsync off) */
229 val |= TCX_THC_MISC_VSYNC_DIS;
231 case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */
232 val |= TCX_THC_MISC_HSYNC_DIS;
235 case FB_BLANK_POWERDOWN: /* Poweroff */
239 sbus_writel(val, &thc->thc_misc);
241 spin_unlock_irqrestore(&par->lock, flags);
246 static struct sbus_mmap_map __tcx_mmap_map[TCX_MMAP_ENTRIES] = {
249 .size = SBUS_MMAP_FBSIZE(1)
252 .voff = TCX_RAM24BIT,
253 .size = SBUS_MMAP_FBSIZE(4)
257 .size = SBUS_MMAP_FBSIZE(8)
261 .size = SBUS_MMAP_FBSIZE(8)
264 .voff = TCX_CONTROLPLANE,
265 .size = SBUS_MMAP_FBSIZE(4)
269 .size = SBUS_MMAP_FBSIZE(8)
273 .size = SBUS_MMAP_FBSIZE(8)
302 static int tcx_mmap(struct fb_info *info, struct vm_area_struct *vma)
304 struct tcx_par *par = (struct tcx_par *)info->par;
306 return sbusfb_mmap_helper(par->mmap_map,
307 info->fix.smem_start, info->fix.smem_len,
311 static int tcx_ioctl(struct fb_info *info, unsigned int cmd,
314 struct tcx_par *par = (struct tcx_par *) info->par;
316 return sbusfb_ioctl_helper(cmd, arg, info,
318 (par->lowdepth ? 8 : 24),
327 tcx_init_fix(struct fb_info *info, int linebytes)
329 struct tcx_par *par = (struct tcx_par *)info->par;
330 const char *tcx_name;
337 strscpy(info->fix.id, tcx_name, sizeof(info->fix.id));
339 info->fix.type = FB_TYPE_PACKED_PIXELS;
340 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
342 info->fix.line_length = linebytes;
344 info->fix.accel = FB_ACCEL_SUN_TCX;
347 static void tcx_unmap_regs(struct platform_device *op, struct fb_info *info,
351 of_iounmap(&op->resource[7],
352 par->tec, sizeof(struct tcx_tec));
354 of_iounmap(&op->resource[9],
355 par->thc, sizeof(struct tcx_thc));
357 of_iounmap(&op->resource[8],
358 par->bt, sizeof(struct bt_regs));
360 of_iounmap(&op->resource[4],
361 par->cplane, info->fix.smem_len * sizeof(u32));
362 if (info->screen_base)
363 of_iounmap(&op->resource[0],
364 info->screen_base, info->fix.smem_len);
367 static int tcx_probe(struct platform_device *op)
369 struct device_node *dp = op->dev.of_node;
370 struct fb_info *info;
372 int linebytes, i, err;
374 info = framebuffer_alloc(sizeof(struct tcx_par), &op->dev);
381 spin_lock_init(&par->lock);
383 par->lowdepth = of_property_read_bool(dp, "tcx-8-bit");
385 sbusfb_fill_var(&info->var, dp, 8);
386 info->var.red.length = 8;
387 info->var.green.length = 8;
388 info->var.blue.length = 8;
390 linebytes = of_getintprop_default(dp, "linebytes",
392 info->fix.smem_len = PAGE_ALIGN(linebytes * info->var.yres);
394 par->tec = of_ioremap(&op->resource[7], 0,
395 sizeof(struct tcx_tec), "tcx tec");
396 par->thc = of_ioremap(&op->resource[9], 0,
397 sizeof(struct tcx_thc), "tcx thc");
398 par->bt = of_ioremap(&op->resource[8], 0,
399 sizeof(struct bt_regs), "tcx dac");
400 info->screen_base = of_ioremap(&op->resource[0], 0,
401 info->fix.smem_len, "tcx ram");
402 if (!par->tec || !par->thc ||
403 !par->bt || !info->screen_base)
406 memcpy(&par->mmap_map, &__tcx_mmap_map, sizeof(par->mmap_map));
407 if (!par->lowdepth) {
408 par->cplane = of_ioremap(&op->resource[4], 0,
409 info->fix.smem_len * sizeof(u32),
414 par->mmap_map[1].size = SBUS_MMAP_EMPTY;
415 par->mmap_map[4].size = SBUS_MMAP_EMPTY;
416 par->mmap_map[5].size = SBUS_MMAP_EMPTY;
417 par->mmap_map[6].size = SBUS_MMAP_EMPTY;
420 info->fix.smem_start = op->resource[0].start;
421 par->which_io = op->resource[0].flags & IORESOURCE_BITS;
423 for (i = 0; i < TCX_MMAP_ENTRIES; i++) {
439 par->mmap_map[i].poff = op->resource[j].start;
442 info->flags = FBINFO_DEFAULT;
443 info->fbops = &tcx_ops;
445 /* Initialize brooktree DAC. */
446 sbus_writel(0x04 << 24, &par->bt->addr); /* color planes */
447 sbus_writel(0xff << 24, &par->bt->control);
448 sbus_writel(0x05 << 24, &par->bt->addr);
449 sbus_writel(0x00 << 24, &par->bt->control);
450 sbus_writel(0x06 << 24, &par->bt->addr); /* overlay plane */
451 sbus_writel(0x73 << 24, &par->bt->control);
452 sbus_writel(0x07 << 24, &par->bt->addr);
453 sbus_writel(0x00 << 24, &par->bt->control);
457 tcx_blank(FB_BLANK_UNBLANK, info);
459 if (fb_alloc_cmap(&info->cmap, 256, 0))
462 fb_set_cmap(&info->cmap, info);
463 tcx_init_fix(info, linebytes);
465 err = register_framebuffer(info);
467 goto out_dealloc_cmap;
469 dev_set_drvdata(&op->dev, info);
471 printk(KERN_INFO "%pOF: TCX at %lx:%lx, %s\n",
474 info->fix.smem_start,
475 par->lowdepth ? "8-bit only" : "24-bit depth");
480 fb_dealloc_cmap(&info->cmap);
483 tcx_unmap_regs(op, info, par);
484 framebuffer_release(info);
490 static void tcx_remove(struct platform_device *op)
492 struct fb_info *info = dev_get_drvdata(&op->dev);
493 struct tcx_par *par = info->par;
495 unregister_framebuffer(info);
496 fb_dealloc_cmap(&info->cmap);
498 tcx_unmap_regs(op, info, par);
500 framebuffer_release(info);
503 static const struct of_device_id tcx_match[] = {
509 MODULE_DEVICE_TABLE(of, tcx_match);
511 static struct platform_driver tcx_driver = {
514 .of_match_table = tcx_match,
517 .remove_new = tcx_remove,
520 static int __init tcx_init(void)
522 if (fb_get_options("tcxfb", NULL))
525 return platform_driver_register(&tcx_driver);
528 static void __exit tcx_exit(void)
530 platform_driver_unregister(&tcx_driver);
533 module_init(tcx_init);
534 module_exit(tcx_exit);
536 MODULE_DESCRIPTION("framebuffer driver for TCX chipsets");
537 MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
538 MODULE_VERSION("2.0");
539 MODULE_LICENSE("GPL");