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_sbusfb_mmap(struct fb_info *info, struct vm_area_struct *vma); |
35 | static int p9100_sbusfb_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg); |
36 | |
37 | /* |
38 | * Frame buffer operations |
39 | */ |
40 | |
41 | static const struct fb_ops p9100_ops = { |
42 | .owner = THIS_MODULE, |
43 | FB_DEFAULT_SBUS_OPS(p9100), |
44 | .fb_setcolreg = p9100_setcolreg, |
45 | .fb_blank = p9100_blank, |
46 | }; |
47 | |
48 | /* P9100 control registers */ |
49 | #define P9100_SYSCTL_OFF 0x0UL |
50 | #define P9100_VIDEOCTL_OFF 0x100UL |
51 | #define P9100_VRAMCTL_OFF 0x180UL |
52 | #define P9100_RAMDAC_OFF 0x200UL |
53 | #define P9100_VIDEOCOPROC_OFF 0x400UL |
54 | |
55 | /* P9100 command registers */ |
56 | #define P9100_CMD_OFF 0x0UL |
57 | |
58 | /* P9100 framebuffer memory */ |
59 | #define P9100_FB_OFF 0x0UL |
60 | |
61 | /* 3 bits: 2=8bpp 3=16bpp 5=32bpp 7=24bpp */ |
62 | #define SYS_CONFIG_PIXELSIZE_SHIFT 26 |
63 | |
64 | #define SCREENPAINT_TIMECTL1_ENABLE_VIDEO 0x20 /* 0 = off, 1 = on */ |
65 | |
66 | struct p9100_regs { |
67 | /* Registers for the system control */ |
68 | u32 sys_base; |
69 | u32 sys_config; |
70 | u32 sys_intr; |
71 | u32 sys_int_ena; |
72 | u32 sys_alt_rd; |
73 | u32 sys_alt_wr; |
74 | u32 sys_xxx[58]; |
75 | |
76 | /* Registers for the video control */ |
77 | u32 vid_base; |
78 | u32 vid_hcnt; |
79 | u32 vid_htotal; |
80 | u32 vid_hsync_rise; |
81 | u32 vid_hblank_rise; |
82 | u32 vid_hblank_fall; |
83 | u32 vid_hcnt_preload; |
84 | u32 vid_vcnt; |
85 | u32 vid_vlen; |
86 | u32 vid_vsync_rise; |
87 | u32 vid_vblank_rise; |
88 | u32 vid_vblank_fall; |
89 | u32 vid_vcnt_preload; |
90 | u32 vid_screenpaint_addr; |
91 | u32 vid_screenpaint_timectl1; |
92 | u32 vid_screenpaint_qsfcnt; |
93 | u32 vid_screenpaint_timectl2; |
94 | u32 vid_xxx[15]; |
95 | |
96 | /* Registers for the video control */ |
97 | u32 vram_base; |
98 | u32 vram_memcfg; |
99 | u32 vram_refresh_pd; |
100 | u32 vram_refresh_cnt; |
101 | u32 vram_raslo_max; |
102 | u32 vram_raslo_cur; |
103 | u32 pwrup_cfg; |
104 | u32 vram_xxx[25]; |
105 | |
106 | /* Registers for IBM RGB528 Palette */ |
107 | u32 ramdac_cmap_wridx; |
108 | u32 ramdac_palette_data; |
109 | u32 ramdac_pixel_mask; |
110 | u32 ramdac_palette_rdaddr; |
111 | u32 ramdac_idx_lo; |
112 | u32 ramdac_idx_hi; |
113 | u32 ramdac_idx_data; |
114 | u32 ramdac_idx_ctl; |
115 | u32 ramdac_xxx[1784]; |
116 | }; |
117 | |
118 | struct p9100_cmd_parameng { |
119 | u32 parameng_status; |
120 | u32 parameng_bltcmd; |
121 | u32 parameng_quadcmd; |
122 | }; |
123 | |
124 | struct p9100_par { |
125 | spinlock_t lock; |
126 | struct p9100_regs __iomem *regs; |
127 | |
128 | u32 flags; |
129 | #define P9100_FLAG_BLANKED 0x00000001 |
130 | |
131 | unsigned long which_io; |
132 | }; |
133 | |
134 | /** |
135 | * p9100_setcolreg - Optional function. Sets a color register. |
136 | * @regno: boolean, 0 copy local, 1 get_user() function |
137 | * @red: frame buffer colormap structure |
138 | * @green: The green value which can be up to 16 bits wide |
139 | * @blue: The blue value which can be up to 16 bits wide. |
140 | * @transp: If supported the alpha value which can be up to 16 bits wide. |
141 | * @info: frame buffer info structure |
142 | */ |
143 | static int p9100_setcolreg(unsigned regno, |
144 | unsigned red, unsigned green, unsigned blue, |
145 | unsigned transp, struct fb_info *info) |
146 | { |
147 | struct p9100_par *par = (struct p9100_par *) info->par; |
148 | struct p9100_regs __iomem *regs = par->regs; |
149 | unsigned long flags; |
150 | |
151 | if (regno >= 256) |
152 | return 1; |
153 | |
154 | red >>= 8; |
155 | green >>= 8; |
156 | blue >>= 8; |
157 | |
158 | spin_lock_irqsave(&par->lock, flags); |
159 | |
160 | sbus_writel((regno << 16), ®s->ramdac_cmap_wridx); |
161 | sbus_writel((red << 16), ®s->ramdac_palette_data); |
162 | sbus_writel((green << 16), ®s->ramdac_palette_data); |
163 | sbus_writel((blue << 16), ®s->ramdac_palette_data); |
164 | |
165 | spin_unlock_irqrestore(lock: &par->lock, flags); |
166 | |
167 | return 0; |
168 | } |
169 | |
170 | /** |
171 | * p9100_blank - Optional function. Blanks the display. |
172 | * @blank: the blank mode we want. |
173 | * @info: frame buffer structure that represents a single frame buffer |
174 | */ |
175 | static int |
176 | p9100_blank(int blank, struct fb_info *info) |
177 | { |
178 | struct p9100_par *par = (struct p9100_par *) info->par; |
179 | struct p9100_regs __iomem *regs = par->regs; |
180 | unsigned long flags; |
181 | u32 val; |
182 | |
183 | spin_lock_irqsave(&par->lock, flags); |
184 | |
185 | switch (blank) { |
186 | case FB_BLANK_UNBLANK: /* Unblanking */ |
187 | val = sbus_readl(®s->vid_screenpaint_timectl1); |
188 | val |= SCREENPAINT_TIMECTL1_ENABLE_VIDEO; |
189 | sbus_writel(val, ®s->vid_screenpaint_timectl1); |
190 | par->flags &= ~P9100_FLAG_BLANKED; |
191 | break; |
192 | |
193 | case FB_BLANK_NORMAL: /* Normal blanking */ |
194 | case FB_BLANK_VSYNC_SUSPEND: /* VESA blank (vsync off) */ |
195 | case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */ |
196 | case FB_BLANK_POWERDOWN: /* Poweroff */ |
197 | val = sbus_readl(®s->vid_screenpaint_timectl1); |
198 | val &= ~SCREENPAINT_TIMECTL1_ENABLE_VIDEO; |
199 | sbus_writel(val, ®s->vid_screenpaint_timectl1); |
200 | par->flags |= P9100_FLAG_BLANKED; |
201 | break; |
202 | } |
203 | |
204 | spin_unlock_irqrestore(lock: &par->lock, flags); |
205 | |
206 | return 0; |
207 | } |
208 | |
209 | static struct sbus_mmap_map p9100_mmap_map[] = { |
210 | { CG3_MMAP_OFFSET, 0, SBUS_MMAP_FBSIZE(1) }, |
211 | { 0, 0, 0 } |
212 | }; |
213 | |
214 | static int p9100_sbusfb_mmap(struct fb_info *info, struct vm_area_struct *vma) |
215 | { |
216 | struct p9100_par *par = (struct p9100_par *)info->par; |
217 | |
218 | return sbusfb_mmap_helper(map: p9100_mmap_map, |
219 | physbase: info->fix.smem_start, fbsize: info->fix.smem_len, |
220 | iospace: par->which_io, vma); |
221 | } |
222 | |
223 | static int p9100_sbusfb_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg) |
224 | { |
225 | /* Make it look like a cg3. */ |
226 | return sbusfb_ioctl_helper(cmd, arg, info, |
227 | type: FBTYPE_SUN3COLOR, fb_depth: 8, fb_size: info->fix.smem_len); |
228 | } |
229 | |
230 | /* |
231 | * Initialisation |
232 | */ |
233 | |
234 | static void p9100_init_fix(struct fb_info *info, int linebytes, struct device_node *dp) |
235 | { |
236 | snprintf(buf: info->fix.id, size: sizeof(info->fix.id), fmt: "%pOFn" , dp); |
237 | |
238 | info->fix.type = FB_TYPE_PACKED_PIXELS; |
239 | info->fix.visual = FB_VISUAL_PSEUDOCOLOR; |
240 | |
241 | info->fix.line_length = linebytes; |
242 | |
243 | info->fix.accel = FB_ACCEL_SUN_CGTHREE; |
244 | } |
245 | |
246 | static int p9100_probe(struct platform_device *op) |
247 | { |
248 | struct device_node *dp = op->dev.of_node; |
249 | struct fb_info *info; |
250 | struct p9100_par *par; |
251 | int linebytes, err; |
252 | |
253 | info = framebuffer_alloc(size: sizeof(struct p9100_par), dev: &op->dev); |
254 | |
255 | err = -ENOMEM; |
256 | if (!info) |
257 | goto out_err; |
258 | par = info->par; |
259 | |
260 | spin_lock_init(&par->lock); |
261 | |
262 | /* This is the framebuffer and the only resource apps can mmap. */ |
263 | info->fix.smem_start = op->resource[2].start; |
264 | par->which_io = op->resource[2].flags & IORESOURCE_BITS; |
265 | |
266 | sbusfb_fill_var(var: &info->var, dp, bpp: 8); |
267 | info->var.red.length = 8; |
268 | info->var.green.length = 8; |
269 | info->var.blue.length = 8; |
270 | |
271 | linebytes = of_getintprop_default(dp, "linebytes" , info->var.xres); |
272 | info->fix.smem_len = PAGE_ALIGN(linebytes * info->var.yres); |
273 | |
274 | par->regs = of_ioremap(&op->resource[0], 0, |
275 | sizeof(struct p9100_regs), "p9100 regs" ); |
276 | if (!par->regs) |
277 | goto out_release_fb; |
278 | |
279 | info->fbops = &p9100_ops; |
280 | info->screen_base = of_ioremap(&op->resource[2], 0, |
281 | info->fix.smem_len, "p9100 ram" ); |
282 | if (!info->screen_base) |
283 | goto out_unmap_regs; |
284 | |
285 | p9100_blank(blank: FB_BLANK_UNBLANK, info); |
286 | |
287 | if (fb_alloc_cmap(cmap: &info->cmap, len: 256, transp: 0)) |
288 | goto out_unmap_screen; |
289 | |
290 | p9100_init_fix(info, linebytes, dp); |
291 | |
292 | err = register_framebuffer(fb_info: info); |
293 | if (err < 0) |
294 | goto out_dealloc_cmap; |
295 | |
296 | fb_set_cmap(cmap: &info->cmap, fb_info: info); |
297 | |
298 | dev_set_drvdata(dev: &op->dev, data: info); |
299 | |
300 | printk(KERN_INFO "%pOF: p9100 at %lx:%lx\n" , |
301 | dp, |
302 | par->which_io, info->fix.smem_start); |
303 | |
304 | return 0; |
305 | |
306 | out_dealloc_cmap: |
307 | fb_dealloc_cmap(cmap: &info->cmap); |
308 | |
309 | out_unmap_screen: |
310 | of_iounmap(&op->resource[2], info->screen_base, info->fix.smem_len); |
311 | |
312 | out_unmap_regs: |
313 | of_iounmap(&op->resource[0], par->regs, sizeof(struct p9100_regs)); |
314 | |
315 | out_release_fb: |
316 | framebuffer_release(info); |
317 | |
318 | out_err: |
319 | return err; |
320 | } |
321 | |
322 | static void p9100_remove(struct platform_device *op) |
323 | { |
324 | struct fb_info *info = dev_get_drvdata(dev: &op->dev); |
325 | struct p9100_par *par = info->par; |
326 | |
327 | unregister_framebuffer(fb_info: info); |
328 | fb_dealloc_cmap(cmap: &info->cmap); |
329 | |
330 | of_iounmap(&op->resource[0], par->regs, sizeof(struct p9100_regs)); |
331 | of_iounmap(&op->resource[2], info->screen_base, info->fix.smem_len); |
332 | |
333 | framebuffer_release(info); |
334 | } |
335 | |
336 | static const struct of_device_id p9100_match[] = { |
337 | { |
338 | .name = "p9100" , |
339 | }, |
340 | {}, |
341 | }; |
342 | MODULE_DEVICE_TABLE(of, p9100_match); |
343 | |
344 | static struct platform_driver p9100_driver = { |
345 | .driver = { |
346 | .name = "p9100" , |
347 | .of_match_table = p9100_match, |
348 | }, |
349 | .probe = p9100_probe, |
350 | .remove_new = p9100_remove, |
351 | }; |
352 | |
353 | static int __init p9100_init(void) |
354 | { |
355 | if (fb_get_options(name: "p9100fb" , NULL)) |
356 | return -ENODEV; |
357 | |
358 | return platform_driver_register(&p9100_driver); |
359 | } |
360 | |
361 | static void __exit p9100_exit(void) |
362 | { |
363 | platform_driver_unregister(&p9100_driver); |
364 | } |
365 | |
366 | module_init(p9100_init); |
367 | module_exit(p9100_exit); |
368 | |
369 | MODULE_DESCRIPTION("framebuffer driver for P9100 chipsets" ); |
370 | MODULE_AUTHOR("David S. Miller <davem@davemloft.net>" ); |
371 | MODULE_VERSION("2.0" ); |
372 | MODULE_LICENSE("GPL" ); |
373 | |