1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * linux/drivers/video/vt8500lcdfb.c |
4 | * |
5 | * Copyright (C) 2010 Alexey Charkov <alchark@gmail.com> |
6 | * |
7 | * Based on skeletonfb.c and pxafb.c |
8 | */ |
9 | |
10 | #include <linux/delay.h> |
11 | #include <linux/dma-mapping.h> |
12 | #include <linux/errno.h> |
13 | #include <linux/fb.h> |
14 | #include <linux/init.h> |
15 | #include <linux/interrupt.h> |
16 | #include <linux/io.h> |
17 | #include <linux/kernel.h> |
18 | #include <linux/mm.h> |
19 | #include <linux/module.h> |
20 | #include <linux/platform_device.h> |
21 | #include <linux/slab.h> |
22 | #include <linux/string.h> |
23 | #include <linux/wait.h> |
24 | #include <video/of_display_timing.h> |
25 | |
26 | #include "vt8500lcdfb.h" |
27 | #include "wmt_ge_rops.h" |
28 | |
29 | #ifdef CONFIG_OF |
30 | #include <linux/of.h> |
31 | #include <linux/of_fdt.h> |
32 | #include <linux/memblock.h> |
33 | #endif |
34 | |
35 | |
36 | #define to_vt8500lcd_info(__info) container_of(__info, \ |
37 | struct vt8500lcd_info, fb) |
38 | |
39 | static int vt8500lcd_set_par(struct fb_info *info) |
40 | { |
41 | struct vt8500lcd_info *fbi = to_vt8500lcd_info(info); |
42 | int reg_bpp = 5; /* 16bpp */ |
43 | int i; |
44 | unsigned long control0; |
45 | |
46 | if (!fbi) |
47 | return -EINVAL; |
48 | |
49 | if (info->var.bits_per_pixel <= 8) { |
50 | /* palettized */ |
51 | info->var.red.offset = 0; |
52 | info->var.red.length = info->var.bits_per_pixel; |
53 | info->var.red.msb_right = 0; |
54 | |
55 | info->var.green.offset = 0; |
56 | info->var.green.length = info->var.bits_per_pixel; |
57 | info->var.green.msb_right = 0; |
58 | |
59 | info->var.blue.offset = 0; |
60 | info->var.blue.length = info->var.bits_per_pixel; |
61 | info->var.blue.msb_right = 0; |
62 | |
63 | info->var.transp.offset = 0; |
64 | info->var.transp.length = 0; |
65 | info->var.transp.msb_right = 0; |
66 | |
67 | info->fix.visual = FB_VISUAL_PSEUDOCOLOR; |
68 | info->fix.line_length = info->var.xres_virtual / |
69 | (8/info->var.bits_per_pixel); |
70 | } else { |
71 | /* non-palettized */ |
72 | info->var.transp.offset = 0; |
73 | info->var.transp.length = 0; |
74 | info->var.transp.msb_right = 0; |
75 | |
76 | if (info->var.bits_per_pixel == 16) { |
77 | /* RGB565 */ |
78 | info->var.red.offset = 11; |
79 | info->var.red.length = 5; |
80 | info->var.red.msb_right = 0; |
81 | info->var.green.offset = 5; |
82 | info->var.green.length = 6; |
83 | info->var.green.msb_right = 0; |
84 | info->var.blue.offset = 0; |
85 | info->var.blue.length = 5; |
86 | info->var.blue.msb_right = 0; |
87 | } else { |
88 | /* Equal depths per channel */ |
89 | info->var.red.offset = info->var.bits_per_pixel |
90 | * 2 / 3; |
91 | info->var.red.length = info->var.bits_per_pixel / 3; |
92 | info->var.red.msb_right = 0; |
93 | info->var.green.offset = info->var.bits_per_pixel / 3; |
94 | info->var.green.length = info->var.bits_per_pixel / 3; |
95 | info->var.green.msb_right = 0; |
96 | info->var.blue.offset = 0; |
97 | info->var.blue.length = info->var.bits_per_pixel / 3; |
98 | info->var.blue.msb_right = 0; |
99 | } |
100 | |
101 | info->fix.visual = FB_VISUAL_TRUECOLOR; |
102 | info->fix.line_length = info->var.bits_per_pixel > 16 ? |
103 | info->var.xres_virtual << 2 : |
104 | info->var.xres_virtual << 1; |
105 | } |
106 | |
107 | for (i = 0; i < 8; i++) { |
108 | if (bpp_values[i] == info->var.bits_per_pixel) |
109 | reg_bpp = i; |
110 | } |
111 | |
112 | control0 = readl(addr: fbi->regbase) & ~0xf; |
113 | writel(val: 0, addr: fbi->regbase); |
114 | while (readl(addr: fbi->regbase + 0x38) & 0x10) |
115 | /* wait */; |
116 | writel(val: (((info->var.hsync_len - 1) & 0x3f) << 26) |
117 | | ((info->var.left_margin & 0xff) << 18) |
118 | | (((info->var.xres - 1) & 0x3ff) << 8) |
119 | | (info->var.right_margin & 0xff), addr: fbi->regbase + 0x4); |
120 | writel(val: (((info->var.vsync_len - 1) & 0x3f) << 26) |
121 | | ((info->var.upper_margin & 0xff) << 18) |
122 | | (((info->var.yres - 1) & 0x3ff) << 8) |
123 | | (info->var.lower_margin & 0xff), addr: fbi->regbase + 0x8); |
124 | writel(val: (((info->var.yres - 1) & 0x400) << 2) |
125 | | ((info->var.xres - 1) & 0x400), addr: fbi->regbase + 0x10); |
126 | writel(val: 0x80000000, addr: fbi->regbase + 0x20); |
127 | writel(val: control0 | (reg_bpp << 1) | 0x100, addr: fbi->regbase); |
128 | |
129 | return 0; |
130 | } |
131 | |
132 | static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf) |
133 | { |
134 | chan &= 0xffff; |
135 | chan >>= 16 - bf->length; |
136 | return chan << bf->offset; |
137 | } |
138 | |
139 | static int vt8500lcd_setcolreg(unsigned regno, unsigned red, unsigned green, |
140 | unsigned blue, unsigned transp, |
141 | struct fb_info *info) { |
142 | struct vt8500lcd_info *fbi = to_vt8500lcd_info(info); |
143 | int ret = 1; |
144 | unsigned int val; |
145 | if (regno >= 256) |
146 | return -EINVAL; |
147 | |
148 | if (info->var.grayscale) |
149 | red = green = blue = |
150 | (19595 * red + 38470 * green + 7471 * blue) >> 16; |
151 | |
152 | switch (fbi->fb.fix.visual) { |
153 | case FB_VISUAL_TRUECOLOR: |
154 | if (regno < 16) { |
155 | u32 *pal = fbi->fb.pseudo_palette; |
156 | |
157 | val = chan_to_field(chan: red, bf: &fbi->fb.var.red); |
158 | val |= chan_to_field(chan: green, bf: &fbi->fb.var.green); |
159 | val |= chan_to_field(chan: blue, bf: &fbi->fb.var.blue); |
160 | |
161 | pal[regno] = val; |
162 | ret = 0; |
163 | } |
164 | break; |
165 | |
166 | case FB_VISUAL_STATIC_PSEUDOCOLOR: |
167 | case FB_VISUAL_PSEUDOCOLOR: |
168 | writew(val: (red & 0xf800) |
169 | | ((green >> 5) & 0x7e0) |
170 | | ((blue >> 11) & 0x1f), |
171 | addr: fbi->palette_cpu + sizeof(u16) * regno); |
172 | break; |
173 | } |
174 | |
175 | return ret; |
176 | } |
177 | |
178 | static int vt8500lcd_ioctl(struct fb_info *info, unsigned int cmd, |
179 | unsigned long arg) |
180 | { |
181 | int ret = 0; |
182 | struct vt8500lcd_info *fbi = to_vt8500lcd_info(info); |
183 | |
184 | if (cmd == FBIO_WAITFORVSYNC) { |
185 | /* Unmask End of Frame interrupt */ |
186 | writel(val: 0xffffffff ^ (1 << 3), addr: fbi->regbase + 0x3c); |
187 | ret = wait_event_interruptible_timeout(fbi->wait, |
188 | readl(fbi->regbase + 0x38) & (1 << 3), HZ / 10); |
189 | /* Mask back to reduce unwanted interrupt traffic */ |
190 | writel(val: 0xffffffff, addr: fbi->regbase + 0x3c); |
191 | if (ret < 0) |
192 | return ret; |
193 | if (ret == 0) |
194 | return -ETIMEDOUT; |
195 | } |
196 | |
197 | return ret; |
198 | } |
199 | |
200 | static int vt8500lcd_pan_display(struct fb_var_screeninfo *var, |
201 | struct fb_info *info) |
202 | { |
203 | unsigned pixlen = info->fix.line_length / info->var.xres_virtual; |
204 | unsigned off = pixlen * var->xoffset |
205 | + info->fix.line_length * var->yoffset; |
206 | struct vt8500lcd_info *fbi = to_vt8500lcd_info(info); |
207 | |
208 | writel(val: (1 << 31) |
209 | | (((info->var.xres_virtual - info->var.xres) * pixlen / 4) << 20) |
210 | | (off >> 2), addr: fbi->regbase + 0x20); |
211 | return 0; |
212 | } |
213 | |
214 | /* |
215 | * vt8500lcd_blank(): |
216 | * Blank the display by setting all palette values to zero. Note, |
217 | * True Color modes do not really use the palette, so this will not |
218 | * blank the display in all modes. |
219 | */ |
220 | static int vt8500lcd_blank(int blank, struct fb_info *info) |
221 | { |
222 | int i; |
223 | |
224 | switch (blank) { |
225 | case FB_BLANK_POWERDOWN: |
226 | case FB_BLANK_VSYNC_SUSPEND: |
227 | case FB_BLANK_HSYNC_SUSPEND: |
228 | case FB_BLANK_NORMAL: |
229 | if (info->fix.visual == FB_VISUAL_PSEUDOCOLOR || |
230 | info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR) |
231 | for (i = 0; i < 256; i++) |
232 | vt8500lcd_setcolreg(regno: i, red: 0, green: 0, blue: 0, transp: 0, info); |
233 | fallthrough; |
234 | case FB_BLANK_UNBLANK: |
235 | if (info->fix.visual == FB_VISUAL_PSEUDOCOLOR || |
236 | info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR) |
237 | fb_set_cmap(cmap: &info->cmap, fb_info: info); |
238 | } |
239 | return 0; |
240 | } |
241 | |
242 | static const struct fb_ops vt8500lcd_ops = { |
243 | .owner = THIS_MODULE, |
244 | __FB_DEFAULT_DMAMEM_OPS_RDWR, |
245 | .fb_set_par = vt8500lcd_set_par, |
246 | .fb_setcolreg = vt8500lcd_setcolreg, |
247 | .fb_fillrect = wmt_ge_fillrect, |
248 | .fb_copyarea = wmt_ge_copyarea, |
249 | .fb_imageblit = sys_imageblit, |
250 | .fb_sync = wmt_ge_sync, |
251 | .fb_ioctl = vt8500lcd_ioctl, |
252 | .fb_pan_display = vt8500lcd_pan_display, |
253 | .fb_blank = vt8500lcd_blank, |
254 | // .fb_mmap needs DMA mmap |
255 | }; |
256 | |
257 | static irqreturn_t vt8500lcd_handle_irq(int irq, void *dev_id) |
258 | { |
259 | struct vt8500lcd_info *fbi = dev_id; |
260 | |
261 | if (readl(addr: fbi->regbase + 0x38) & (1 << 3)) |
262 | wake_up_interruptible(&fbi->wait); |
263 | |
264 | writel(val: 0xffffffff, addr: fbi->regbase + 0x38); |
265 | return IRQ_HANDLED; |
266 | } |
267 | |
268 | static int vt8500lcd_probe(struct platform_device *pdev) |
269 | { |
270 | struct vt8500lcd_info *fbi; |
271 | struct resource *res; |
272 | struct display_timings *disp_timing; |
273 | void *addr; |
274 | int irq, ret; |
275 | |
276 | struct fb_videomode of_mode; |
277 | u32 bpp; |
278 | dma_addr_t fb_mem_phys; |
279 | unsigned long fb_mem_len; |
280 | void *fb_mem_virt; |
281 | |
282 | ret = -ENOMEM; |
283 | fbi = NULL; |
284 | |
285 | fbi = devm_kzalloc(dev: &pdev->dev, size: sizeof(struct vt8500lcd_info) |
286 | + sizeof(u32) * 16, GFP_KERNEL); |
287 | if (!fbi) |
288 | return -ENOMEM; |
289 | |
290 | strcpy(p: fbi->fb.fix.id, q: "VT8500 LCD" ); |
291 | |
292 | fbi->fb.fix.type = FB_TYPE_PACKED_PIXELS; |
293 | fbi->fb.fix.xpanstep = 0; |
294 | fbi->fb.fix.ypanstep = 1; |
295 | fbi->fb.fix.ywrapstep = 0; |
296 | fbi->fb.fix.accel = FB_ACCEL_NONE; |
297 | |
298 | fbi->fb.var.nonstd = 0; |
299 | fbi->fb.var.activate = FB_ACTIVATE_NOW; |
300 | fbi->fb.var.height = -1; |
301 | fbi->fb.var.width = -1; |
302 | fbi->fb.var.vmode = FB_VMODE_NONINTERLACED; |
303 | |
304 | fbi->fb.fbops = &vt8500lcd_ops; |
305 | fbi->fb.flags = FBINFO_HWACCEL_COPYAREA |
306 | | FBINFO_HWACCEL_FILLRECT |
307 | | FBINFO_HWACCEL_YPAN |
308 | | FBINFO_VIRTFB |
309 | | FBINFO_PARTIAL_PAN_OK; |
310 | fbi->fb.node = -1; |
311 | |
312 | addr = fbi; |
313 | addr = addr + sizeof(struct vt8500lcd_info); |
314 | fbi->fb.pseudo_palette = addr; |
315 | |
316 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
317 | if (res == NULL) { |
318 | dev_err(&pdev->dev, "no I/O memory resource defined\n" ); |
319 | return -ENODEV; |
320 | } |
321 | |
322 | res = request_mem_region(res->start, resource_size(res), "vt8500lcd" ); |
323 | if (res == NULL) { |
324 | dev_err(&pdev->dev, "failed to request I/O memory\n" ); |
325 | return -EBUSY; |
326 | } |
327 | |
328 | fbi->regbase = ioremap(offset: res->start, size: resource_size(res)); |
329 | if (fbi->regbase == NULL) { |
330 | dev_err(&pdev->dev, "failed to map I/O memory\n" ); |
331 | ret = -EBUSY; |
332 | goto failed_free_res; |
333 | } |
334 | |
335 | disp_timing = of_get_display_timings(np: pdev->dev.of_node); |
336 | if (!disp_timing) { |
337 | ret = -EINVAL; |
338 | goto failed_free_io; |
339 | } |
340 | |
341 | ret = of_get_fb_videomode(np: pdev->dev.of_node, fb: &of_mode, |
342 | OF_USE_NATIVE_MODE); |
343 | if (ret) |
344 | goto failed_free_io; |
345 | |
346 | ret = of_property_read_u32(np: pdev->dev.of_node, propname: "bits-per-pixel" , out_value: &bpp); |
347 | if (ret) |
348 | goto failed_free_io; |
349 | |
350 | /* try allocating the framebuffer */ |
351 | fb_mem_len = of_mode.xres * of_mode.yres * 2 * (bpp / 8); |
352 | fb_mem_virt = dma_alloc_coherent(dev: &pdev->dev, size: fb_mem_len, dma_handle: &fb_mem_phys, |
353 | GFP_KERNEL); |
354 | if (!fb_mem_virt) { |
355 | pr_err("%s: Failed to allocate framebuffer\n" , __func__); |
356 | ret = -ENOMEM; |
357 | goto failed_free_io; |
358 | } |
359 | |
360 | fbi->fb.fix.smem_start = fb_mem_phys; |
361 | fbi->fb.fix.smem_len = fb_mem_len; |
362 | fbi->fb.screen_buffer = fb_mem_virt; |
363 | |
364 | fbi->palette_size = PAGE_ALIGN(512); |
365 | fbi->palette_cpu = dma_alloc_coherent(dev: &pdev->dev, |
366 | size: fbi->palette_size, |
367 | dma_handle: &fbi->palette_phys, |
368 | GFP_KERNEL); |
369 | if (fbi->palette_cpu == NULL) { |
370 | dev_err(&pdev->dev, "Failed to allocate palette buffer\n" ); |
371 | ret = -ENOMEM; |
372 | goto failed_free_io; |
373 | } |
374 | |
375 | irq = platform_get_irq(pdev, 0); |
376 | if (irq < 0) { |
377 | ret = -ENODEV; |
378 | goto failed_free_palette; |
379 | } |
380 | |
381 | ret = request_irq(irq, handler: vt8500lcd_handle_irq, flags: 0, name: "LCD" , dev: fbi); |
382 | if (ret) { |
383 | dev_err(&pdev->dev, "request_irq failed: %d\n" , ret); |
384 | ret = -EBUSY; |
385 | goto failed_free_palette; |
386 | } |
387 | |
388 | init_waitqueue_head(&fbi->wait); |
389 | |
390 | if (fb_alloc_cmap(cmap: &fbi->fb.cmap, len: 256, transp: 0) < 0) { |
391 | dev_err(&pdev->dev, "Failed to allocate color map\n" ); |
392 | ret = -ENOMEM; |
393 | goto failed_free_irq; |
394 | } |
395 | |
396 | fb_videomode_to_var(var: &fbi->fb.var, mode: &of_mode); |
397 | |
398 | fbi->fb.var.xres_virtual = of_mode.xres; |
399 | fbi->fb.var.yres_virtual = of_mode.yres * 2; |
400 | fbi->fb.var.bits_per_pixel = bpp; |
401 | |
402 | ret = vt8500lcd_set_par(info: &fbi->fb); |
403 | if (ret) { |
404 | dev_err(&pdev->dev, "Failed to set parameters\n" ); |
405 | goto failed_free_cmap; |
406 | } |
407 | |
408 | writel(val: fbi->fb.fix.smem_start >> 22, addr: fbi->regbase + 0x1c); |
409 | writel(val: (fbi->palette_phys & 0xfffffe00) | 1, addr: fbi->regbase + 0x18); |
410 | |
411 | platform_set_drvdata(pdev, data: fbi); |
412 | |
413 | ret = register_framebuffer(fb_info: &fbi->fb); |
414 | if (ret < 0) { |
415 | dev_err(&pdev->dev, |
416 | "Failed to register framebuffer device: %d\n" , ret); |
417 | goto failed_free_cmap; |
418 | } |
419 | |
420 | /* |
421 | * Ok, now enable the LCD controller |
422 | */ |
423 | writel(readl(addr: fbi->regbase) | 1, addr: fbi->regbase); |
424 | |
425 | return 0; |
426 | |
427 | failed_free_cmap: |
428 | if (fbi->fb.cmap.len) |
429 | fb_dealloc_cmap(cmap: &fbi->fb.cmap); |
430 | failed_free_irq: |
431 | free_irq(irq, fbi); |
432 | failed_free_palette: |
433 | dma_free_coherent(dev: &pdev->dev, size: fbi->palette_size, |
434 | cpu_addr: fbi->palette_cpu, dma_handle: fbi->palette_phys); |
435 | failed_free_io: |
436 | iounmap(addr: fbi->regbase); |
437 | failed_free_res: |
438 | release_mem_region(res->start, resource_size(res)); |
439 | return ret; |
440 | } |
441 | |
442 | static void vt8500lcd_remove(struct platform_device *pdev) |
443 | { |
444 | struct vt8500lcd_info *fbi = platform_get_drvdata(pdev); |
445 | struct resource *res; |
446 | int irq; |
447 | |
448 | unregister_framebuffer(fb_info: &fbi->fb); |
449 | |
450 | writel(val: 0, addr: fbi->regbase); |
451 | |
452 | if (fbi->fb.cmap.len) |
453 | fb_dealloc_cmap(cmap: &fbi->fb.cmap); |
454 | |
455 | irq = platform_get_irq(pdev, 0); |
456 | free_irq(irq, fbi); |
457 | |
458 | dma_free_coherent(dev: &pdev->dev, size: fbi->palette_size, |
459 | cpu_addr: fbi->palette_cpu, dma_handle: fbi->palette_phys); |
460 | |
461 | iounmap(addr: fbi->regbase); |
462 | |
463 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
464 | release_mem_region(res->start, resource_size(res)); |
465 | } |
466 | |
467 | static const struct of_device_id via_dt_ids[] = { |
468 | { .compatible = "via,vt8500-fb" , }, |
469 | {} |
470 | }; |
471 | |
472 | static struct platform_driver vt8500lcd_driver = { |
473 | .probe = vt8500lcd_probe, |
474 | .remove_new = vt8500lcd_remove, |
475 | .driver = { |
476 | .name = "vt8500-lcd" , |
477 | .of_match_table = of_match_ptr(via_dt_ids), |
478 | }, |
479 | }; |
480 | |
481 | module_platform_driver(vt8500lcd_driver); |
482 | |
483 | MODULE_AUTHOR("Alexey Charkov <alchark@gmail.com>" ); |
484 | MODULE_DESCRIPTION("LCD controller driver for VIA VT8500" ); |
485 | MODULE_LICENSE("GPL v2" ); |
486 | MODULE_DEVICE_TABLE(of, via_dt_ids); |
487 | |