xref: /openbmc/linux/drivers/video/fbdev/p9100.c (revision c900529f3d9161bfde5cca0754f83b4d3c3e0220)
1  // SPDX-License-Identifier: GPL-2.0-only
2  /* p9100.c: P9100 frame buffer driver
3   *
4   * Copyright (C) 2003, 2006 David S. Miller (davem@davemloft.net)
5   * Copyright 1999 Derrick J Brashear (shadow@dementia.org)
6   *
7   * Driver layout based loosely on tgafb.c, see that file for credits.
8   */
9  
10  #include <linux/module.h>
11  #include <linux/kernel.h>
12  #include <linux/errno.h>
13  #include <linux/string.h>
14  #include <linux/delay.h>
15  #include <linux/init.h>
16  #include <linux/fb.h>
17  #include <linux/mm.h>
18  #include <linux/of.h>
19  #include <linux/platform_device.h>
20  
21  #include <asm/io.h>
22  #include <asm/fbio.h>
23  
24  #include "sbuslib.h"
25  
26  /*
27   * Local functions.
28   */
29  
30  static int p9100_setcolreg(unsigned, unsigned, unsigned, unsigned,
31  			   unsigned, struct fb_info *);
32  static int p9100_blank(int, struct fb_info *);
33  
34  static int p9100_mmap(struct fb_info *, struct vm_area_struct *);
35  static int p9100_ioctl(struct fb_info *, unsigned int, unsigned long);
36  
37  /*
38   *  Frame buffer operations
39   */
40  
41  static const struct fb_ops p9100_ops = {
42  	.owner			= THIS_MODULE,
43  	.fb_setcolreg		= p9100_setcolreg,
44  	.fb_blank		= p9100_blank,
45  	.fb_fillrect		= cfb_fillrect,
46  	.fb_copyarea		= cfb_copyarea,
47  	.fb_imageblit		= cfb_imageblit,
48  	.fb_mmap		= p9100_mmap,
49  	.fb_ioctl		= p9100_ioctl,
50  #ifdef CONFIG_COMPAT
51  	.fb_compat_ioctl	= sbusfb_compat_ioctl,
52  #endif
53  };
54  
55  /* P9100 control registers */
56  #define P9100_SYSCTL_OFF	0x0UL
57  #define P9100_VIDEOCTL_OFF	0x100UL
58  #define P9100_VRAMCTL_OFF 	0x180UL
59  #define P9100_RAMDAC_OFF 	0x200UL
60  #define P9100_VIDEOCOPROC_OFF 	0x400UL
61  
62  /* P9100 command registers */
63  #define P9100_CMD_OFF 0x0UL
64  
65  /* P9100 framebuffer memory */
66  #define P9100_FB_OFF 0x0UL
67  
68  /* 3 bits: 2=8bpp 3=16bpp 5=32bpp 7=24bpp */
69  #define SYS_CONFIG_PIXELSIZE_SHIFT 26
70  
71  #define SCREENPAINT_TIMECTL1_ENABLE_VIDEO 0x20 /* 0 = off, 1 = on */
72  
73  struct p9100_regs {
74  	/* Registers for the system control */
75  	u32 sys_base;
76  	u32 sys_config;
77  	u32 sys_intr;
78  	u32 sys_int_ena;
79  	u32 sys_alt_rd;
80  	u32 sys_alt_wr;
81  	u32 sys_xxx[58];
82  
83  	/* Registers for the video control */
84  	u32 vid_base;
85  	u32 vid_hcnt;
86  	u32 vid_htotal;
87  	u32 vid_hsync_rise;
88  	u32 vid_hblank_rise;
89  	u32 vid_hblank_fall;
90  	u32 vid_hcnt_preload;
91  	u32 vid_vcnt;
92  	u32 vid_vlen;
93  	u32 vid_vsync_rise;
94  	u32 vid_vblank_rise;
95  	u32 vid_vblank_fall;
96  	u32 vid_vcnt_preload;
97  	u32 vid_screenpaint_addr;
98  	u32 vid_screenpaint_timectl1;
99  	u32 vid_screenpaint_qsfcnt;
100  	u32 vid_screenpaint_timectl2;
101  	u32 vid_xxx[15];
102  
103  	/* Registers for the video control */
104  	u32 vram_base;
105  	u32 vram_memcfg;
106  	u32 vram_refresh_pd;
107  	u32 vram_refresh_cnt;
108  	u32 vram_raslo_max;
109  	u32 vram_raslo_cur;
110  	u32 pwrup_cfg;
111  	u32 vram_xxx[25];
112  
113  	/* Registers for IBM RGB528 Palette */
114  	u32 ramdac_cmap_wridx;
115  	u32 ramdac_palette_data;
116  	u32 ramdac_pixel_mask;
117  	u32 ramdac_palette_rdaddr;
118  	u32 ramdac_idx_lo;
119  	u32 ramdac_idx_hi;
120  	u32 ramdac_idx_data;
121  	u32 ramdac_idx_ctl;
122  	u32 ramdac_xxx[1784];
123  };
124  
125  struct p9100_cmd_parameng {
126  	u32 parameng_status;
127  	u32 parameng_bltcmd;
128  	u32 parameng_quadcmd;
129  };
130  
131  struct p9100_par {
132  	spinlock_t		lock;
133  	struct p9100_regs	__iomem *regs;
134  
135  	u32			flags;
136  #define P9100_FLAG_BLANKED	0x00000001
137  
138  	unsigned long		which_io;
139  };
140  
141  /**
142   *      p9100_setcolreg - Optional function. Sets a color register.
143   *      @regno: boolean, 0 copy local, 1 get_user() function
144   *      @red: frame buffer colormap structure
145   *      @green: The green value which can be up to 16 bits wide
146   *      @blue:  The blue value which can be up to 16 bits wide.
147   *      @transp: If supported the alpha value which can be up to 16 bits wide.
148   *      @info: frame buffer info structure
149   */
p9100_setcolreg(unsigned regno,unsigned red,unsigned green,unsigned blue,unsigned transp,struct fb_info * info)150  static int p9100_setcolreg(unsigned regno,
151  			   unsigned red, unsigned green, unsigned blue,
152  			   unsigned transp, struct fb_info *info)
153  {
154  	struct p9100_par *par = (struct p9100_par *) info->par;
155  	struct p9100_regs __iomem *regs = par->regs;
156  	unsigned long flags;
157  
158  	if (regno >= 256)
159  		return 1;
160  
161  	red >>= 8;
162  	green >>= 8;
163  	blue >>= 8;
164  
165  	spin_lock_irqsave(&par->lock, flags);
166  
167  	sbus_writel((regno << 16), &regs->ramdac_cmap_wridx);
168  	sbus_writel((red << 16), &regs->ramdac_palette_data);
169  	sbus_writel((green << 16), &regs->ramdac_palette_data);
170  	sbus_writel((blue << 16), &regs->ramdac_palette_data);
171  
172  	spin_unlock_irqrestore(&par->lock, flags);
173  
174  	return 0;
175  }
176  
177  /**
178   *      p9100_blank - Optional function.  Blanks the display.
179   *      @blank: the blank mode we want.
180   *      @info: frame buffer structure that represents a single frame buffer
181   */
182  static int
p9100_blank(int blank,struct fb_info * info)183  p9100_blank(int blank, struct fb_info *info)
184  {
185  	struct p9100_par *par = (struct p9100_par *) info->par;
186  	struct p9100_regs __iomem *regs = par->regs;
187  	unsigned long flags;
188  	u32 val;
189  
190  	spin_lock_irqsave(&par->lock, flags);
191  
192  	switch (blank) {
193  	case FB_BLANK_UNBLANK: /* Unblanking */
194  		val = sbus_readl(&regs->vid_screenpaint_timectl1);
195  		val |= SCREENPAINT_TIMECTL1_ENABLE_VIDEO;
196  		sbus_writel(val, &regs->vid_screenpaint_timectl1);
197  		par->flags &= ~P9100_FLAG_BLANKED;
198  		break;
199  
200  	case FB_BLANK_NORMAL: /* Normal blanking */
201  	case FB_BLANK_VSYNC_SUSPEND: /* VESA blank (vsync off) */
202  	case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */
203  	case FB_BLANK_POWERDOWN: /* Poweroff */
204  		val = sbus_readl(&regs->vid_screenpaint_timectl1);
205  		val &= ~SCREENPAINT_TIMECTL1_ENABLE_VIDEO;
206  		sbus_writel(val, &regs->vid_screenpaint_timectl1);
207  		par->flags |= P9100_FLAG_BLANKED;
208  		break;
209  	}
210  
211  	spin_unlock_irqrestore(&par->lock, flags);
212  
213  	return 0;
214  }
215  
216  static struct sbus_mmap_map p9100_mmap_map[] = {
217  	{ CG3_MMAP_OFFSET,	0,		SBUS_MMAP_FBSIZE(1) },
218  	{ 0,			0,		0		    }
219  };
220  
p9100_mmap(struct fb_info * info,struct vm_area_struct * vma)221  static int p9100_mmap(struct fb_info *info, struct vm_area_struct *vma)
222  {
223  	struct p9100_par *par = (struct p9100_par *)info->par;
224  
225  	return sbusfb_mmap_helper(p9100_mmap_map,
226  				  info->fix.smem_start, info->fix.smem_len,
227  				  par->which_io, vma);
228  }
229  
p9100_ioctl(struct fb_info * info,unsigned int cmd,unsigned long arg)230  static int p9100_ioctl(struct fb_info *info, unsigned int cmd,
231  		       unsigned long arg)
232  {
233  	/* Make it look like a cg3. */
234  	return sbusfb_ioctl_helper(cmd, arg, info,
235  				   FBTYPE_SUN3COLOR, 8, info->fix.smem_len);
236  }
237  
238  /*
239   *  Initialisation
240   */
241  
p9100_init_fix(struct fb_info * info,int linebytes,struct device_node * dp)242  static void p9100_init_fix(struct fb_info *info, int linebytes, struct device_node *dp)
243  {
244  	snprintf(info->fix.id, sizeof(info->fix.id), "%pOFn", dp);
245  
246  	info->fix.type = FB_TYPE_PACKED_PIXELS;
247  	info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
248  
249  	info->fix.line_length = linebytes;
250  
251  	info->fix.accel = FB_ACCEL_SUN_CGTHREE;
252  }
253  
p9100_probe(struct platform_device * op)254  static int p9100_probe(struct platform_device *op)
255  {
256  	struct device_node *dp = op->dev.of_node;
257  	struct fb_info *info;
258  	struct p9100_par *par;
259  	int linebytes, err;
260  
261  	info = framebuffer_alloc(sizeof(struct p9100_par), &op->dev);
262  
263  	err = -ENOMEM;
264  	if (!info)
265  		goto out_err;
266  	par = info->par;
267  
268  	spin_lock_init(&par->lock);
269  
270  	/* This is the framebuffer and the only resource apps can mmap.  */
271  	info->fix.smem_start = op->resource[2].start;
272  	par->which_io = op->resource[2].flags & IORESOURCE_BITS;
273  
274  	sbusfb_fill_var(&info->var, dp, 8);
275  	info->var.red.length = 8;
276  	info->var.green.length = 8;
277  	info->var.blue.length = 8;
278  
279  	linebytes = of_getintprop_default(dp, "linebytes", info->var.xres);
280  	info->fix.smem_len = PAGE_ALIGN(linebytes * info->var.yres);
281  
282  	par->regs = of_ioremap(&op->resource[0], 0,
283  			       sizeof(struct p9100_regs), "p9100 regs");
284  	if (!par->regs)
285  		goto out_release_fb;
286  
287  	info->fbops = &p9100_ops;
288  	info->screen_base = of_ioremap(&op->resource[2], 0,
289  				       info->fix.smem_len, "p9100 ram");
290  	if (!info->screen_base)
291  		goto out_unmap_regs;
292  
293  	p9100_blank(FB_BLANK_UNBLANK, info);
294  
295  	if (fb_alloc_cmap(&info->cmap, 256, 0))
296  		goto out_unmap_screen;
297  
298  	p9100_init_fix(info, linebytes, dp);
299  
300  	err = register_framebuffer(info);
301  	if (err < 0)
302  		goto out_dealloc_cmap;
303  
304  	fb_set_cmap(&info->cmap, info);
305  
306  	dev_set_drvdata(&op->dev, info);
307  
308  	printk(KERN_INFO "%pOF: p9100 at %lx:%lx\n",
309  	       dp,
310  	       par->which_io, info->fix.smem_start);
311  
312  	return 0;
313  
314  out_dealloc_cmap:
315  	fb_dealloc_cmap(&info->cmap);
316  
317  out_unmap_screen:
318  	of_iounmap(&op->resource[2], info->screen_base, info->fix.smem_len);
319  
320  out_unmap_regs:
321  	of_iounmap(&op->resource[0], par->regs, sizeof(struct p9100_regs));
322  
323  out_release_fb:
324  	framebuffer_release(info);
325  
326  out_err:
327  	return err;
328  }
329  
p9100_remove(struct platform_device * op)330  static void p9100_remove(struct platform_device *op)
331  {
332  	struct fb_info *info = dev_get_drvdata(&op->dev);
333  	struct p9100_par *par = info->par;
334  
335  	unregister_framebuffer(info);
336  	fb_dealloc_cmap(&info->cmap);
337  
338  	of_iounmap(&op->resource[0], par->regs, sizeof(struct p9100_regs));
339  	of_iounmap(&op->resource[2], info->screen_base, info->fix.smem_len);
340  
341  	framebuffer_release(info);
342  }
343  
344  static const struct of_device_id p9100_match[] = {
345  	{
346  		.name = "p9100",
347  	},
348  	{},
349  };
350  MODULE_DEVICE_TABLE(of, p9100_match);
351  
352  static struct platform_driver p9100_driver = {
353  	.driver = {
354  		.name = "p9100",
355  		.of_match_table = p9100_match,
356  	},
357  	.probe		= p9100_probe,
358  	.remove_new	= p9100_remove,
359  };
360  
p9100_init(void)361  static int __init p9100_init(void)
362  {
363  	if (fb_get_options("p9100fb", NULL))
364  		return -ENODEV;
365  
366  	return platform_driver_register(&p9100_driver);
367  }
368  
p9100_exit(void)369  static void __exit p9100_exit(void)
370  {
371  	platform_driver_unregister(&p9100_driver);
372  }
373  
374  module_init(p9100_init);
375  module_exit(p9100_exit);
376  
377  MODULE_DESCRIPTION("framebuffer driver for P9100 chipsets");
378  MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
379  MODULE_VERSION("2.0");
380  MODULE_LICENSE("GPL");
381