1 // SPDX-License-Identifier: GPL-2.0-only
2 /* cg14.c: CGFOURTEEN 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) 1995 Miguel de Icaza (miguel@nuclecu.unam.mx)
8 * Driver layout based loosely on tgafb.c, see that file for credits.
11 #include <linux/module.h>
12 #include <linux/kernel.h>
13 #include <linux/errno.h>
14 #include <linux/string.h>
15 #include <linux/delay.h>
16 #include <linux/init.h>
19 #include <linux/uaccess.h>
20 #include <linux/of_device.h>
31 static int cg14_setcolreg(unsigned, unsigned, unsigned, unsigned,
32 unsigned, struct fb_info *);
34 static int cg14_mmap(struct fb_info *, struct vm_area_struct *);
35 static int cg14_ioctl(struct fb_info *, unsigned int, unsigned long);
36 static int cg14_pan_display(struct fb_var_screeninfo *, struct fb_info *);
39 * Frame buffer operations
42 static const struct fb_ops cg14_ops = {
44 .fb_setcolreg = cg14_setcolreg,
45 .fb_pan_display = cg14_pan_display,
46 .fb_fillrect = cfb_fillrect,
47 .fb_copyarea = cfb_copyarea,
48 .fb_imageblit = cfb_imageblit,
50 .fb_ioctl = cg14_ioctl,
52 .fb_compat_ioctl = sbusfb_compat_ioctl,
56 #define CG14_MCR_INTENABLE_SHIFT 7
57 #define CG14_MCR_INTENABLE_MASK 0x80
58 #define CG14_MCR_VIDENABLE_SHIFT 6
59 #define CG14_MCR_VIDENABLE_MASK 0x40
60 #define CG14_MCR_PIXMODE_SHIFT 4
61 #define CG14_MCR_PIXMODE_MASK 0x30
62 #define CG14_MCR_TMR_SHIFT 2
63 #define CG14_MCR_TMR_MASK 0x0c
64 #define CG14_MCR_TMENABLE_SHIFT 1
65 #define CG14_MCR_TMENABLE_MASK 0x02
66 #define CG14_MCR_RESET_SHIFT 0
67 #define CG14_MCR_RESET_MASK 0x01
68 #define CG14_REV_REVISION_SHIFT 4
69 #define CG14_REV_REVISION_MASK 0xf0
70 #define CG14_REV_IMPL_SHIFT 0
71 #define CG14_REV_IMPL_MASK 0x0f
72 #define CG14_VBR_FRAMEBASE_SHIFT 12
73 #define CG14_VBR_FRAMEBASE_MASK 0x00fff000
74 #define CG14_VMCR1_SETUP_SHIFT 0
75 #define CG14_VMCR1_SETUP_MASK 0x000001ff
76 #define CG14_VMCR1_VCONFIG_SHIFT 9
77 #define CG14_VMCR1_VCONFIG_MASK 0x00000e00
78 #define CG14_VMCR2_REFRESH_SHIFT 0
79 #define CG14_VMCR2_REFRESH_MASK 0x00000001
80 #define CG14_VMCR2_TESTROWCNT_SHIFT 1
81 #define CG14_VMCR2_TESTROWCNT_MASK 0x00000002
82 #define CG14_VMCR2_FBCONFIG_SHIFT 2
83 #define CG14_VMCR2_FBCONFIG_MASK 0x0000000c
84 #define CG14_VCR_REFRESHREQ_SHIFT 0
85 #define CG14_VCR_REFRESHREQ_MASK 0x000003ff
86 #define CG14_VCR1_REFRESHENA_SHIFT 10
87 #define CG14_VCR1_REFRESHENA_MASK 0x00000400
88 #define CG14_VCA_CAD_SHIFT 0
89 #define CG14_VCA_CAD_MASK 0x000003ff
90 #define CG14_VCA_VERS_SHIFT 10
91 #define CG14_VCA_VERS_MASK 0x00000c00
92 #define CG14_VCA_RAMSPEED_SHIFT 12
93 #define CG14_VCA_RAMSPEED_MASK 0x00001000
94 #define CG14_VCA_8MB_SHIFT 13
95 #define CG14_VCA_8MB_MASK 0x00002000
97 #define CG14_MCR_PIXMODE_8 0
98 #define CG14_MCR_PIXMODE_16 2
99 #define CG14_MCR_PIXMODE_32 3
102 u8 mcr; /* Master Control Reg */
103 u8 ppr; /* Packed Pixel Reg */
104 u8 tms[2]; /* Test Mode Status Regs */
105 u8 msr; /* Master Status Reg */
106 u8 fsr; /* Fault Status Reg */
107 u8 rev; /* Revision & Impl */
108 u8 ccr; /* Clock Control Reg */
109 u32 tmr; /* Test Mode Read Back */
110 u8 mod; /* Monitor Operation Data Reg */
111 u8 acr; /* Aux Control */
113 u16 hct; /* Hor Counter */
114 u16 vct; /* Vert Counter */
115 u16 hbs; /* Hor Blank Start */
116 u16 hbc; /* Hor Blank Clear */
117 u16 hss; /* Hor Sync Start */
118 u16 hsc; /* Hor Sync Clear */
119 u16 csc; /* Composite Sync Clear */
120 u16 vbs; /* Vert Blank Start */
121 u16 vbc; /* Vert Blank Clear */
122 u16 vss; /* Vert Sync Start */
123 u16 vsc; /* Vert Sync Clear */
126 u16 fsa; /* Fault Status Address */
127 u16 adr; /* Address Registers */
129 u8 pcg[0x100]; /* Pixel Clock Generator */
130 u32 vbr; /* Frame Base Row */
131 u32 vmcr; /* VBC Master Control */
132 u32 vcr; /* VBC refresh */
133 u32 vca; /* VBC Config */
136 #define CG14_CCR_ENABLE 0x04
137 #define CG14_CCR_SELECT 0x02 /* HW/Full screen */
140 u32 cpl0[32]; /* Enable plane 0 */
141 u32 cpl1[32]; /* Color selection plane */
142 u8 ccr; /* Cursor Control Reg */
144 u16 cursx; /* Cursor x,y position */
145 u16 cursy; /* Cursor x,y position */
149 u32 cpl0i[32]; /* Enable plane 0 autoinc */
150 u32 cpl1i[32]; /* Color selection autoinc */
154 u8 addr; /* Address Register */
156 u8 glut; /* Gamma table */
158 u8 select; /* Register Select */
160 u8 mode; /* Mode Register */
168 u8 x_xlutd_inc [256];
171 /* Color look up table (clut) */
172 /* Each one of these arrays hold the color lookup table (for 256
173 * colors) for each MDI page (I assume then there should be 4 MDI
174 * pages, I still wonder what they are. I have seen NeXTStep split
175 * the screen in four parts, while operating in 24 bits mode. Each
176 * integer holds 4 values: alpha value (transparency channel, thanks
177 * go to John Stone (johns@umr.edu) from OpenBSD), red, green and blue
179 * I currently use the clut instead of the Xlut
183 u32 c_clutd [256]; /* i wonder what the 'd' is for */
184 u32 c_clut_inc [256];
185 u32 c_clutd_inc [256];
188 #define CG14_MMAP_ENTRIES 16
192 struct cg14_regs __iomem *regs;
193 struct cg14_clut __iomem *clut;
194 struct cg14_cursor __iomem *cursor;
197 #define CG14_FLAG_BLANKED 0x00000001
199 unsigned long iospace;
201 struct sbus_mmap_map mmap_map[CG14_MMAP_ENTRIES];
207 static void __cg14_reset(struct cg14_par *par)
209 struct cg14_regs __iomem *regs = par->regs;
212 val = sbus_readb(®s->mcr);
213 val &= ~(CG14_MCR_PIXMODE_MASK);
214 sbus_writeb(val, ®s->mcr);
217 static int cg14_pan_display(struct fb_var_screeninfo *var, struct fb_info *info)
219 struct cg14_par *par = (struct cg14_par *) info->par;
222 /* We just use this to catch switches out of
225 spin_lock_irqsave(&par->lock, flags);
227 spin_unlock_irqrestore(&par->lock, flags);
229 if (var->xoffset || var->yoffset || var->vmode)
235 * cg14_setcolreg - Optional function. Sets a color register.
236 * @regno: boolean, 0 copy local, 1 get_user() function
237 * @red: frame buffer colormap structure
238 * @green: The green value which can be up to 16 bits wide
239 * @blue: The blue value which can be up to 16 bits wide.
240 * @transp: If supported the alpha value which can be up to 16 bits wide.
241 * @info: frame buffer info structure
243 static int cg14_setcolreg(unsigned regno,
244 unsigned red, unsigned green, unsigned blue,
245 unsigned transp, struct fb_info *info)
247 struct cg14_par *par = (struct cg14_par *) info->par;
248 struct cg14_clut __iomem *clut = par->clut;
258 val = (red | (green << 8) | (blue << 16));
260 spin_lock_irqsave(&par->lock, flags);
261 sbus_writel(val, &clut->c_clut[regno]);
262 spin_unlock_irqrestore(&par->lock, flags);
267 static int cg14_mmap(struct fb_info *info, struct vm_area_struct *vma)
269 struct cg14_par *par = (struct cg14_par *) info->par;
271 return sbusfb_mmap_helper(par->mmap_map,
272 info->fix.smem_start, info->fix.smem_len,
276 static int cg14_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg)
278 struct cg14_par *par = (struct cg14_par *) info->par;
279 struct cg14_regs __iomem *regs = par->regs;
280 struct mdi_cfginfo kmdi, __user *mdii;
282 int cur_mode, mode, ret = 0;
286 spin_lock_irqsave(&par->lock, flags);
288 spin_unlock_irqrestore(&par->lock, flags);
291 case MDI_GET_CFGINFO:
292 memset(&kmdi, 0, sizeof(kmdi));
294 spin_lock_irqsave(&par->lock, flags);
295 kmdi.mdi_type = FBTYPE_MDICOLOR;
296 kmdi.mdi_height = info->var.yres;
297 kmdi.mdi_width = info->var.xres;
298 kmdi.mdi_mode = par->mode;
299 kmdi.mdi_pixfreq = 72; /* FIXME */
300 kmdi.mdi_size = par->ramsize;
301 spin_unlock_irqrestore(&par->lock, flags);
303 mdii = (struct mdi_cfginfo __user *) arg;
304 if (copy_to_user(mdii, &kmdi, sizeof(kmdi)))
308 case MDI_SET_PIXELMODE:
309 if (get_user(mode, (int __user *) arg)) {
314 spin_lock_irqsave(&par->lock, flags);
315 cur_mode = sbus_readb(®s->mcr);
316 cur_mode &= ~CG14_MCR_PIXMODE_MASK;
319 cur_mode |= (CG14_MCR_PIXMODE_32 <<
320 CG14_MCR_PIXMODE_SHIFT);
324 cur_mode |= (CG14_MCR_PIXMODE_16 <<
325 CG14_MCR_PIXMODE_SHIFT);
336 sbus_writeb(cur_mode, ®s->mcr);
339 spin_unlock_irqrestore(&par->lock, flags);
343 ret = sbusfb_ioctl_helper(cmd, arg, info,
356 static void cg14_init_fix(struct fb_info *info, int linebytes,
357 struct device_node *dp)
359 snprintf(info->fix.id, sizeof(info->fix.id), "%pOFn", dp);
361 info->fix.type = FB_TYPE_PACKED_PIXELS;
362 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
364 info->fix.line_length = linebytes;
366 info->fix.accel = FB_ACCEL_SUN_CG14;
369 static struct sbus_mmap_map __cg14_mmap_map[CG14_MMAP_ENTRIES] = {
396 .voff = CG3_MMAP_OFFSET - 0x7000,
401 .voff = CG3_MMAP_OFFSET,
403 .size = SBUS_MMAP_FBSIZE(1)
406 .voff = MDI_CURSOR_MAP,
411 .voff = MDI_CHUNKY_BGR_MAP,
416 .voff = MDI_PLANAR_X16_MAP,
421 .voff = MDI_PLANAR_C16_MAP,
426 .voff = MDI_PLANAR_X32_MAP,
431 .voff = MDI_PLANAR_B32_MAP,
436 .voff = MDI_PLANAR_G32_MAP,
441 .voff = MDI_PLANAR_R32_MAP,
448 static void cg14_unmap_regs(struct platform_device *op, struct fb_info *info,
449 struct cg14_par *par)
452 of_iounmap(&op->resource[0],
453 par->regs, sizeof(struct cg14_regs));
455 of_iounmap(&op->resource[0],
456 par->clut, sizeof(struct cg14_clut));
458 of_iounmap(&op->resource[0],
459 par->cursor, sizeof(struct cg14_cursor));
460 if (info->screen_base)
461 of_iounmap(&op->resource[1],
462 info->screen_base, info->fix.smem_len);
465 static int cg14_probe(struct platform_device *op)
467 struct device_node *dp = op->dev.of_node;
468 struct fb_info *info;
469 struct cg14_par *par;
470 int is_8mb, linebytes, i, err;
472 info = framebuffer_alloc(sizeof(struct cg14_par), &op->dev);
479 spin_lock_init(&par->lock);
481 sbusfb_fill_var(&info->var, dp, 8);
482 info->var.red.length = 8;
483 info->var.green.length = 8;
484 info->var.blue.length = 8;
486 linebytes = of_getintprop_default(dp, "linebytes",
488 info->fix.smem_len = PAGE_ALIGN(linebytes * info->var.yres);
490 if (of_node_name_eq(dp->parent, "sbus") ||
491 of_node_name_eq(dp->parent, "sbi")) {
492 info->fix.smem_start = op->resource[0].start;
493 par->iospace = op->resource[0].flags & IORESOURCE_BITS;
495 info->fix.smem_start = op->resource[1].start;
496 par->iospace = op->resource[0].flags & IORESOURCE_BITS;
499 par->regs = of_ioremap(&op->resource[0], 0,
500 sizeof(struct cg14_regs), "cg14 regs");
501 par->clut = of_ioremap(&op->resource[0], CG14_CLUT1,
502 sizeof(struct cg14_clut), "cg14 clut");
503 par->cursor = of_ioremap(&op->resource[0], CG14_CURSORREGS,
504 sizeof(struct cg14_cursor), "cg14 cursor");
506 info->screen_base = of_ioremap(&op->resource[1], 0,
507 info->fix.smem_len, "cg14 ram");
509 if (!par->regs || !par->clut || !par->cursor || !info->screen_base)
512 is_8mb = (resource_size(&op->resource[1]) == (8 * 1024 * 1024));
514 BUILD_BUG_ON(sizeof(par->mmap_map) != sizeof(__cg14_mmap_map));
516 memcpy(&par->mmap_map, &__cg14_mmap_map, sizeof(par->mmap_map));
518 for (i = 0; i < CG14_MMAP_ENTRIES; i++) {
519 struct sbus_mmap_map *map = &par->mmap_map[i];
523 if (map->poff & 0x80000000)
524 map->poff = (map->poff & 0x7fffffff) +
525 (op->resource[0].start -
526 op->resource[1].start);
528 map->size >= 0x100000 &&
529 map->size <= 0x400000)
533 par->mode = MDI_8_PIX;
534 par->ramsize = (is_8mb ? 0x800000 : 0x400000);
536 info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;
537 info->fbops = &cg14_ops;
541 if (fb_alloc_cmap(&info->cmap, 256, 0))
544 fb_set_cmap(&info->cmap, info);
546 cg14_init_fix(info, linebytes, dp);
548 err = register_framebuffer(info);
550 goto out_dealloc_cmap;
552 dev_set_drvdata(&op->dev, info);
554 printk(KERN_INFO "%pOF: cgfourteen at %lx:%lx, %dMB\n",
556 par->iospace, info->fix.smem_start,
562 fb_dealloc_cmap(&info->cmap);
565 cg14_unmap_regs(op, info, par);
566 framebuffer_release(info);
572 static int cg14_remove(struct platform_device *op)
574 struct fb_info *info = dev_get_drvdata(&op->dev);
575 struct cg14_par *par = info->par;
577 unregister_framebuffer(info);
578 fb_dealloc_cmap(&info->cmap);
580 cg14_unmap_regs(op, info, par);
582 framebuffer_release(info);
587 static const struct of_device_id cg14_match[] = {
589 .name = "cgfourteen",
593 MODULE_DEVICE_TABLE(of, cg14_match);
595 static struct platform_driver cg14_driver = {
598 .of_match_table = cg14_match,
601 .remove = cg14_remove,
604 static int __init cg14_init(void)
606 if (fb_get_options("cg14fb", NULL))
609 return platform_driver_register(&cg14_driver);
612 static void __exit cg14_exit(void)
614 platform_driver_unregister(&cg14_driver);
617 module_init(cg14_init);
618 module_exit(cg14_exit);
620 MODULE_DESCRIPTION("framebuffer driver for CGfourteen chipsets");
621 MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
622 MODULE_VERSION("2.0");
623 MODULE_LICENSE("GPL");