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_device.h>
19
20#include <asm/io.h>
21#include <asm/fbio.h>
22
23#include "sbuslib.h"
24
25/*
26 * Local functions.
27 */
28
29static int p9100_setcolreg(unsigned, unsigned, unsigned, unsigned,
30			   unsigned, struct fb_info *);
31static int p9100_blank(int, struct fb_info *);
32
33static int p9100_mmap(struct fb_info *, struct vm_area_struct *);
34static int p9100_ioctl(struct fb_info *, unsigned int, unsigned long);
35
36/*
37 *  Frame buffer operations
38 */
39
40static const struct fb_ops p9100_ops = {
41	.owner			= THIS_MODULE,
42	.fb_setcolreg		= p9100_setcolreg,
43	.fb_blank		= p9100_blank,
44	.fb_fillrect		= cfb_fillrect,
45	.fb_copyarea		= cfb_copyarea,
46	.fb_imageblit		= cfb_imageblit,
47	.fb_mmap		= p9100_mmap,
48	.fb_ioctl		= p9100_ioctl,
49#ifdef CONFIG_COMPAT
50	.fb_compat_ioctl	= sbusfb_compat_ioctl,
51#endif
52};
53
54/* P9100 control registers */
55#define P9100_SYSCTL_OFF	0x0UL
56#define P9100_VIDEOCTL_OFF	0x100UL
57#define P9100_VRAMCTL_OFF 	0x180UL
58#define P9100_RAMDAC_OFF 	0x200UL
59#define P9100_VIDEOCOPROC_OFF 	0x400UL
60
61/* P9100 command registers */
62#define P9100_CMD_OFF 0x0UL
63
64/* P9100 framebuffer memory */
65#define P9100_FB_OFF 0x0UL
66
67/* 3 bits: 2=8bpp 3=16bpp 5=32bpp 7=24bpp */
68#define SYS_CONFIG_PIXELSIZE_SHIFT 26
69
70#define SCREENPAINT_TIMECTL1_ENABLE_VIDEO 0x20 /* 0 = off, 1 = on */
71
72struct p9100_regs {
73	/* Registers for the system control */
74	u32 sys_base;
75	u32 sys_config;
76	u32 sys_intr;
77	u32 sys_int_ena;
78	u32 sys_alt_rd;
79	u32 sys_alt_wr;
80	u32 sys_xxx[58];
81
82	/* Registers for the video control */
83	u32 vid_base;
84	u32 vid_hcnt;
85	u32 vid_htotal;
86	u32 vid_hsync_rise;
87	u32 vid_hblank_rise;
88	u32 vid_hblank_fall;
89	u32 vid_hcnt_preload;
90	u32 vid_vcnt;
91	u32 vid_vlen;
92	u32 vid_vsync_rise;
93	u32 vid_vblank_rise;
94	u32 vid_vblank_fall;
95	u32 vid_vcnt_preload;
96	u32 vid_screenpaint_addr;
97	u32 vid_screenpaint_timectl1;
98	u32 vid_screenpaint_qsfcnt;
99	u32 vid_screenpaint_timectl2;
100	u32 vid_xxx[15];
101
102	/* Registers for the video control */
103	u32 vram_base;
104	u32 vram_memcfg;
105	u32 vram_refresh_pd;
106	u32 vram_refresh_cnt;
107	u32 vram_raslo_max;
108	u32 vram_raslo_cur;
109	u32 pwrup_cfg;
110	u32 vram_xxx[25];
111
112	/* Registers for IBM RGB528 Palette */
113	u32 ramdac_cmap_wridx;
114	u32 ramdac_palette_data;
115	u32 ramdac_pixel_mask;
116	u32 ramdac_palette_rdaddr;
117	u32 ramdac_idx_lo;
118	u32 ramdac_idx_hi;
119	u32 ramdac_idx_data;
120	u32 ramdac_idx_ctl;
121	u32 ramdac_xxx[1784];
122};
123
124struct p9100_cmd_parameng {
125	u32 parameng_status;
126	u32 parameng_bltcmd;
127	u32 parameng_quadcmd;
128};
129
130struct p9100_par {
131	spinlock_t		lock;
132	struct p9100_regs	__iomem *regs;
133
134	u32			flags;
135#define P9100_FLAG_BLANKED	0x00000001
136
137	unsigned long		which_io;
138};
139
140/**
141 *      p9100_setcolreg - Optional function. Sets a color register.
142 *      @regno: boolean, 0 copy local, 1 get_user() function
143 *      @red: frame buffer colormap structure
144 *      @green: The green value which can be up to 16 bits wide
145 *      @blue:  The blue value which can be up to 16 bits wide.
146 *      @transp: If supported the alpha value which can be up to 16 bits wide.
147 *      @info: frame buffer info structure
148 */
149static int p9100_setcolreg(unsigned regno,
150			   unsigned red, unsigned green, unsigned blue,
151			   unsigned transp, struct fb_info *info)
152{
153	struct p9100_par *par = (struct p9100_par *) info->par;
154	struct p9100_regs __iomem *regs = par->regs;
155	unsigned long flags;
156
157	if (regno >= 256)
158		return 1;
159
160	red >>= 8;
161	green >>= 8;
162	blue >>= 8;
163
164	spin_lock_irqsave(&par->lock, flags);
165
166	sbus_writel((regno << 16), &regs->ramdac_cmap_wridx);
167	sbus_writel((red << 16), &regs->ramdac_palette_data);
168	sbus_writel((green << 16), &regs->ramdac_palette_data);
169	sbus_writel((blue << 16), &regs->ramdac_palette_data);
170
171	spin_unlock_irqrestore(&par->lock, flags);
172
173	return 0;
174}
175
176/**
177 *      p9100_blank - Optional function.  Blanks the display.
178 *      @blank_mode: the blank mode we want.
179 *      @info: frame buffer structure that represents a single frame buffer
180 */
181static int
182p9100_blank(int blank, struct fb_info *info)
183{
184	struct p9100_par *par = (struct p9100_par *) info->par;
185	struct p9100_regs __iomem *regs = par->regs;
186	unsigned long flags;
187	u32 val;
188
189	spin_lock_irqsave(&par->lock, flags);
190
191	switch (blank) {
192	case FB_BLANK_UNBLANK: /* Unblanking */
193		val = sbus_readl(&regs->vid_screenpaint_timectl1);
194		val |= SCREENPAINT_TIMECTL1_ENABLE_VIDEO;
195		sbus_writel(val, &regs->vid_screenpaint_timectl1);
196		par->flags &= ~P9100_FLAG_BLANKED;
197		break;
198
199	case FB_BLANK_NORMAL: /* Normal blanking */
200	case FB_BLANK_VSYNC_SUSPEND: /* VESA blank (vsync off) */
201	case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */
202	case FB_BLANK_POWERDOWN: /* Poweroff */
203		val = sbus_readl(&regs->vid_screenpaint_timectl1);
204		val &= ~SCREENPAINT_TIMECTL1_ENABLE_VIDEO;
205		sbus_writel(val, &regs->vid_screenpaint_timectl1);
206		par->flags |= P9100_FLAG_BLANKED;
207		break;
208	}
209
210	spin_unlock_irqrestore(&par->lock, flags);
211
212	return 0;
213}
214
215static struct sbus_mmap_map p9100_mmap_map[] = {
216	{ CG3_MMAP_OFFSET,	0,		SBUS_MMAP_FBSIZE(1) },
217	{ 0,			0,		0		    }
218};
219
220static int p9100_mmap(struct fb_info *info, struct vm_area_struct *vma)
221{
222	struct p9100_par *par = (struct p9100_par *)info->par;
223
224	return sbusfb_mmap_helper(p9100_mmap_map,
225				  info->fix.smem_start, info->fix.smem_len,
226				  par->which_io, vma);
227}
228
229static int p9100_ioctl(struct fb_info *info, unsigned int cmd,
230		       unsigned long arg)
231{
232	/* Make it look like a cg3. */
233	return sbusfb_ioctl_helper(cmd, arg, info,
234				   FBTYPE_SUN3COLOR, 8, info->fix.smem_len);
235}
236
237/*
238 *  Initialisation
239 */
240
241static void p9100_init_fix(struct fb_info *info, int linebytes, struct device_node *dp)
242{
243	snprintf(info->fix.id, sizeof(info->fix.id), "%pOFn", dp);
244
245	info->fix.type = FB_TYPE_PACKED_PIXELS;
246	info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
247
248	info->fix.line_length = linebytes;
249
250	info->fix.accel = FB_ACCEL_SUN_CGTHREE;
251}
252
253static int p9100_probe(struct platform_device *op)
254{
255	struct device_node *dp = op->dev.of_node;
256	struct fb_info *info;
257	struct p9100_par *par;
258	int linebytes, err;
259
260	info = framebuffer_alloc(sizeof(struct p9100_par), &op->dev);
261
262	err = -ENOMEM;
263	if (!info)
264		goto out_err;
265	par = info->par;
266
267	spin_lock_init(&par->lock);
268
269	/* This is the framebuffer and the only resource apps can mmap.  */
270	info->fix.smem_start = op->resource[2].start;
271	par->which_io = op->resource[2].flags & IORESOURCE_BITS;
272
273	sbusfb_fill_var(&info->var, dp, 8);
274	info->var.red.length = 8;
275	info->var.green.length = 8;
276	info->var.blue.length = 8;
277
278	linebytes = of_getintprop_default(dp, "linebytes", info->var.xres);
279	info->fix.smem_len = PAGE_ALIGN(linebytes * info->var.yres);
280
281	par->regs = of_ioremap(&op->resource[0], 0,
282			       sizeof(struct p9100_regs), "p9100 regs");
283	if (!par->regs)
284		goto out_release_fb;
285
286	info->flags = FBINFO_DEFAULT;
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
314out_dealloc_cmap:
315	fb_dealloc_cmap(&info->cmap);
316
317out_unmap_screen:
318	of_iounmap(&op->resource[2], info->screen_base, info->fix.smem_len);
319
320out_unmap_regs:
321	of_iounmap(&op->resource[0], par->regs, sizeof(struct p9100_regs));
322
323out_release_fb:
324	framebuffer_release(info);
325
326out_err:
327	return err;
328}
329
330static int 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	return 0;
344}
345
346static const struct of_device_id p9100_match[] = {
347	{
348		.name = "p9100",
349	},
350	{},
351};
352MODULE_DEVICE_TABLE(of, p9100_match);
353
354static struct platform_driver p9100_driver = {
355	.driver = {
356		.name = "p9100",
357		.of_match_table = p9100_match,
358	},
359	.probe		= p9100_probe,
360	.remove		= p9100_remove,
361};
362
363static int __init p9100_init(void)
364{
365	if (fb_get_options("p9100fb", NULL))
366		return -ENODEV;
367
368	return platform_driver_register(&p9100_driver);
369}
370
371static void __exit p9100_exit(void)
372{
373	platform_driver_unregister(&p9100_driver);
374}
375
376module_init(p9100_init);
377module_exit(p9100_exit);
378
379MODULE_DESCRIPTION("framebuffer driver for P9100 chipsets");
380MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
381MODULE_VERSION("2.0");
382MODULE_LICENSE("GPL");
383