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1da177e4 LT |
1 | /* |
2 | * linux/drivers/video/clps711xfb.c | |
3 | * | |
4 | * Copyright (C) 2000-2001 Deep Blue Solutions Ltd. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
19 | * | |
20 | * Framebuffer driver for the CLPS7111 and EP7212 processors. | |
21 | */ | |
22 | #include <linux/module.h> | |
23 | #include <linux/kernel.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/fb.h> | |
26 | #include <linux/init.h> | |
27 | #include <linux/proc_fs.h> | |
28 | #include <linux/delay.h> | |
29 | ||
a09e64fb | 30 | #include <mach/hardware.h> |
1da177e4 | 31 | #include <asm/mach-types.h> |
84902b7a | 32 | #include <linux/uaccess.h> |
1da177e4 LT |
33 | |
34 | #include <asm/hardware/clps7111.h> | |
a09e64fb | 35 | #include <mach/syspld.h> |
1da177e4 LT |
36 | |
37 | struct fb_info *cfb; | |
38 | ||
39 | #define CMAP_MAX_SIZE 16 | |
40 | ||
41 | /* The /proc entry for the backlight. */ | |
42 | static struct proc_dir_entry *clps7111fb_backlight_proc_entry = NULL; | |
43 | ||
44 | static int clps7111fb_proc_backlight_read(char *page, char **start, off_t off, | |
45 | int count, int *eof, void *data); | |
46 | static int clps7111fb_proc_backlight_write(struct file *file, | |
47 | const char *buffer, unsigned long count, void *data); | |
48 | ||
49 | /* | |
50 | * LCD AC Prescale. This comes from the LCD panel manufacturers specifications. | |
51 | * This determines how many clocks + 1 of CL1 before the M signal toggles. | |
52 | * The number of lines on the display must not be divisible by this number. | |
53 | */ | |
54 | static unsigned int lcd_ac_prescale = 13; | |
55 | ||
56 | /* | |
57 | * Set a single color register. Return != 0 for invalid regno. | |
58 | */ | |
59 | static int | |
60 | clps7111fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue, | |
61 | u_int transp, struct fb_info *info) | |
62 | { | |
63 | unsigned int level, mask, shift, pal; | |
64 | ||
65 | if (regno >= (1 << info->var.bits_per_pixel)) | |
66 | return 1; | |
67 | ||
68 | /* gray = 0.30*R + 0.58*G + 0.11*B */ | |
69 | level = (red * 77 + green * 151 + blue * 28) >> 20; | |
70 | ||
71 | /* | |
72 | * On an LCD, a high value is dark, while a low value is light. | |
73 | * So we invert the level. | |
74 | * | |
75 | * This isn't true on all machines, so we only do it on EDB7211. | |
76 | * --rmk | |
77 | */ | |
78 | if (machine_is_edb7211()) { | |
79 | level = 15 - level; | |
80 | } | |
81 | ||
82 | shift = 4 * (regno & 7); | |
83 | level <<= shift; | |
84 | mask = 15 << shift; | |
85 | level &= mask; | |
86 | ||
87 | regno = regno < 8 ? PALLSW : PALMSW; | |
88 | ||
89 | pal = clps_readl(regno); | |
90 | pal = (pal & ~mask) | level; | |
91 | clps_writel(pal, regno); | |
92 | ||
93 | return 0; | |
94 | } | |
95 | ||
96 | /* | |
97 | * Validate the purposed mode. | |
98 | */ | |
99 | static int | |
100 | clps7111fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) | |
101 | { | |
102 | var->transp.msb_right = 0; | |
103 | var->transp.offset = 0; | |
104 | var->transp.length = 0; | |
105 | var->red.msb_right = 0; | |
106 | var->red.offset = 0; | |
107 | var->red.length = var->bits_per_pixel; | |
108 | var->green = var->red; | |
109 | var->blue = var->red; | |
110 | ||
111 | if (var->bits_per_pixel > 4) | |
112 | return -EINVAL; | |
113 | ||
114 | return 0; | |
115 | } | |
116 | ||
117 | /* | |
118 | * Set the hardware state. | |
119 | */ | |
120 | static int | |
121 | clps7111fb_set_par(struct fb_info *info) | |
122 | { | |
123 | unsigned int lcdcon, syscon, pixclock; | |
124 | ||
125 | switch (info->var.bits_per_pixel) { | |
126 | case 1: | |
127 | info->fix.visual = FB_VISUAL_MONO01; | |
128 | break; | |
129 | case 2: | |
130 | info->fix.visual = FB_VISUAL_PSEUDOCOLOR; | |
131 | break; | |
132 | case 4: | |
133 | info->fix.visual = FB_VISUAL_PSEUDOCOLOR; | |
134 | break; | |
135 | } | |
136 | ||
137 | info->fix.line_length = info->var.xres_virtual * info->var.bits_per_pixel / 8; | |
138 | ||
139 | lcdcon = (info->var.xres_virtual * info->var.yres_virtual * info->var.bits_per_pixel) / 128 - 1; | |
140 | lcdcon |= ((info->var.xres_virtual / 16) - 1) << 13; | |
141 | lcdcon |= lcd_ac_prescale << 25; | |
142 | ||
143 | /* | |
144 | * Calculate pixel prescale value from the pixclock. This is: | |
145 | * 36.864MHz / pixclock_mhz - 1. | |
146 | * However, pixclock is in picoseconds, so this ends up being: | |
147 | * 36864000 * pixclock_ps / 10^12 - 1 | |
148 | * and this will overflow the 32-bit math. We perform this as | |
149 | * (9 * 4096000 == 36864000): | |
150 | * pixclock_ps * 9 * (4096000 / 10^12) - 1 | |
151 | */ | |
152 | pixclock = 9 * info->var.pixclock / 244140 - 1; | |
153 | lcdcon |= pixclock << 19; | |
154 | ||
155 | if (info->var.bits_per_pixel == 4) | |
156 | lcdcon |= LCDCON_GSMD; | |
157 | if (info->var.bits_per_pixel >= 2) | |
158 | lcdcon |= LCDCON_GSEN; | |
159 | ||
160 | /* | |
161 | * LCDCON must only be changed while the LCD is disabled | |
162 | */ | |
163 | syscon = clps_readl(SYSCON1); | |
164 | clps_writel(syscon & ~SYSCON1_LCDEN, SYSCON1); | |
165 | clps_writel(lcdcon, LCDCON); | |
166 | clps_writel(syscon | SYSCON1_LCDEN, SYSCON1); | |
167 | return 0; | |
168 | } | |
169 | ||
170 | static int clps7111fb_blank(int blank, struct fb_info *info) | |
171 | { | |
172 | if (blank) { | |
173 | if (machine_is_edb7211()) { | |
174 | /* Turn off the LCD backlight. */ | |
175 | clps_writeb(clps_readb(PDDR) & ~EDB_PD3_LCDBL, PDDR); | |
176 | ||
177 | /* Power off the LCD DC-DC converter. */ | |
178 | clps_writeb(clps_readb(PDDR) & ~EDB_PD1_LCD_DC_DC_EN, PDDR); | |
179 | ||
180 | /* Delay for a little while (half a second). */ | |
181 | udelay(100); | |
182 | ||
183 | /* Power off the LCD panel. */ | |
184 | clps_writeb(clps_readb(PDDR) & ~EDB_PD2_LCDEN, PDDR); | |
185 | ||
186 | /* Power off the LCD controller. */ | |
187 | clps_writel(clps_readl(SYSCON1) & ~SYSCON1_LCDEN, | |
188 | SYSCON1); | |
189 | } | |
190 | } else { | |
191 | if (machine_is_edb7211()) { | |
192 | /* Power up the LCD controller. */ | |
193 | clps_writel(clps_readl(SYSCON1) | SYSCON1_LCDEN, | |
194 | SYSCON1); | |
195 | ||
196 | /* Power up the LCD panel. */ | |
197 | clps_writeb(clps_readb(PDDR) | EDB_PD2_LCDEN, PDDR); | |
198 | ||
199 | /* Delay for a little while. */ | |
200 | udelay(100); | |
201 | ||
202 | /* Power up the LCD DC-DC converter. */ | |
203 | clps_writeb(clps_readb(PDDR) | EDB_PD1_LCD_DC_DC_EN, | |
204 | PDDR); | |
205 | ||
206 | /* Turn on the LCD backlight. */ | |
207 | clps_writeb(clps_readb(PDDR) | EDB_PD3_LCDBL, PDDR); | |
208 | } | |
209 | } | |
210 | return 0; | |
211 | } | |
212 | ||
213 | static struct fb_ops clps7111fb_ops = { | |
214 | .owner = THIS_MODULE, | |
215 | .fb_check_var = clps7111fb_check_var, | |
216 | .fb_set_par = clps7111fb_set_par, | |
217 | .fb_setcolreg = clps7111fb_setcolreg, | |
218 | .fb_blank = clps7111fb_blank, | |
219 | .fb_fillrect = cfb_fillrect, | |
220 | .fb_copyarea = cfb_copyarea, | |
221 | .fb_imageblit = cfb_imageblit, | |
1da177e4 LT |
222 | }; |
223 | ||
224 | static int | |
225 | clps7111fb_proc_backlight_read(char *page, char **start, off_t off, | |
226 | int count, int *eof, void *data) | |
227 | { | |
228 | /* We need at least two characters, one for the digit, and one for | |
229 | * the terminating NULL. */ | |
230 | if (count < 2) | |
231 | return -EINVAL; | |
232 | ||
233 | if (machine_is_edb7211()) { | |
234 | return sprintf(page, "%d\n", | |
235 | (clps_readb(PDDR) & EDB_PD3_LCDBL) ? 1 : 0); | |
236 | } | |
237 | ||
238 | return 0; | |
239 | } | |
240 | ||
241 | static int | |
242 | clps7111fb_proc_backlight_write(struct file *file, const char *buffer, | |
243 | unsigned long count, void *data) | |
244 | { | |
245 | unsigned char char_value; | |
246 | int value; | |
247 | ||
248 | if (count < 1) { | |
249 | return -EINVAL; | |
250 | } | |
251 | ||
252 | if (copy_from_user(&char_value, buffer, 1)) | |
253 | return -EFAULT; | |
254 | ||
255 | value = char_value - '0'; | |
256 | ||
257 | if (machine_is_edb7211()) { | |
258 | unsigned char port_d; | |
259 | ||
260 | port_d = clps_readb(PDDR); | |
261 | ||
262 | if (value) { | |
263 | port_d |= EDB_PD3_LCDBL; | |
264 | } else { | |
265 | port_d &= ~EDB_PD3_LCDBL; | |
266 | } | |
267 | ||
268 | clps_writeb(port_d, PDDR); | |
269 | } | |
270 | ||
271 | return count; | |
272 | } | |
273 | ||
274 | static void __init clps711x_guess_lcd_params(struct fb_info *info) | |
275 | { | |
276 | unsigned int lcdcon, syscon, size; | |
277 | unsigned long phys_base = PAGE_OFFSET; | |
278 | void *virt_base = (void *)PAGE_OFFSET; | |
279 | ||
280 | info->var.xres_virtual = 640; | |
281 | info->var.yres_virtual = 240; | |
282 | info->var.bits_per_pixel = 4; | |
283 | info->var.activate = FB_ACTIVATE_NOW; | |
284 | info->var.height = -1; | |
285 | info->var.width = -1; | |
286 | info->var.pixclock = 93006; /* 10.752MHz pixel clock */ | |
287 | ||
288 | /* | |
289 | * If the LCD controller is already running, decode the values | |
290 | * in LCDCON to xres/yres/bpp/pixclock/acprescale | |
291 | */ | |
292 | syscon = clps_readl(SYSCON1); | |
293 | if (syscon & SYSCON1_LCDEN) { | |
294 | lcdcon = clps_readl(LCDCON); | |
295 | ||
296 | /* | |
297 | * Decode GSMD and GSEN bits to bits per pixel | |
298 | */ | |
299 | switch (lcdcon & (LCDCON_GSMD | LCDCON_GSEN)) { | |
300 | case LCDCON_GSMD | LCDCON_GSEN: | |
301 | info->var.bits_per_pixel = 4; | |
302 | break; | |
303 | ||
304 | case LCDCON_GSEN: | |
305 | info->var.bits_per_pixel = 2; | |
306 | break; | |
307 | ||
308 | default: | |
309 | info->var.bits_per_pixel = 1; | |
310 | break; | |
311 | } | |
312 | ||
313 | /* | |
314 | * Decode xres/yres | |
315 | */ | |
316 | info->var.xres_virtual = (((lcdcon >> 13) & 0x3f) + 1) * 16; | |
317 | info->var.yres_virtual = (((lcdcon & 0x1fff) + 1) * 128) / | |
318 | (info->var.xres_virtual * | |
319 | info->var.bits_per_pixel); | |
320 | ||
321 | /* | |
322 | * Calculate pixclock | |
323 | */ | |
324 | info->var.pixclock = (((lcdcon >> 19) & 0x3f) + 1) * 244140 / 9; | |
325 | ||
326 | /* | |
327 | * Grab AC prescale | |
328 | */ | |
329 | lcd_ac_prescale = (lcdcon >> 25) & 0x1f; | |
330 | } | |
331 | ||
332 | info->var.xres = info->var.xres_virtual; | |
333 | info->var.yres = info->var.yres_virtual; | |
334 | info->var.grayscale = info->var.bits_per_pixel > 1; | |
335 | ||
336 | size = info->var.xres * info->var.yres * info->var.bits_per_pixel / 8; | |
337 | ||
338 | /* | |
339 | * Might be worth checking to see if we can use the on-board | |
340 | * RAM if size here... | |
341 | * CLPS7110 - no on-board SRAM | |
342 | * EP7212 - 38400 bytes | |
343 | */ | |
344 | if (size <= 38400) { | |
345 | printk(KERN_INFO "CLPS711xFB: could use on-board SRAM?\n"); | |
346 | } | |
347 | ||
348 | if ((syscon & SYSCON1_LCDEN) == 0) { | |
349 | /* | |
350 | * The display isn't running. Ensure that | |
351 | * the display memory is empty. | |
352 | */ | |
353 | memset(virt_base, 0, size); | |
354 | } | |
355 | ||
356 | info->screen_base = virt_base; | |
357 | info->fix.smem_start = phys_base; | |
358 | info->fix.smem_len = PAGE_ALIGN(size); | |
359 | info->fix.type = FB_TYPE_PACKED_PIXELS; | |
360 | } | |
361 | ||
362 | int __init clps711xfb_init(void) | |
363 | { | |
364 | int err = -ENOMEM; | |
365 | ||
366 | if (fb_get_options("clps711xfb", NULL)) | |
367 | return -ENODEV; | |
368 | ||
dd00cc48 | 369 | cfb = kzalloc(sizeof(*cfb), GFP_KERNEL); |
1da177e4 LT |
370 | if (!cfb) |
371 | goto out; | |
372 | ||
1da177e4 LT |
373 | strcpy(cfb->fix.id, "clps711x"); |
374 | ||
375 | cfb->fbops = &clps7111fb_ops; | |
376 | cfb->flags = FBINFO_DEFAULT; | |
377 | ||
378 | clps711x_guess_lcd_params(cfb); | |
379 | ||
380 | fb_alloc_cmap(&cfb->cmap, CMAP_MAX_SIZE, 0); | |
381 | ||
382 | /* Register the /proc entries. */ | |
383 | clps7111fb_backlight_proc_entry = create_proc_entry("backlight", 0444, | |
c74c120a | 384 | NULL); |
1da177e4 LT |
385 | if (clps7111fb_backlight_proc_entry == NULL) { |
386 | printk("Couldn't create the /proc entry for the backlight.\n"); | |
387 | return -EINVAL; | |
388 | } | |
389 | ||
390 | clps7111fb_backlight_proc_entry->read_proc = | |
391 | &clps7111fb_proc_backlight_read; | |
392 | clps7111fb_backlight_proc_entry->write_proc = | |
393 | &clps7111fb_proc_backlight_write; | |
394 | ||
395 | /* | |
396 | * Power up the LCD | |
397 | */ | |
398 | if (machine_is_p720t()) { | |
399 | PLD_LCDEN = PLD_LCDEN_EN; | |
400 | PLD_PWR |= (PLD_S4_ON|PLD_S3_ON|PLD_S2_ON|PLD_S1_ON); | |
401 | } | |
402 | ||
403 | if (machine_is_edb7211()) { | |
404 | /* Power up the LCD panel. */ | |
405 | clps_writeb(clps_readb(PDDR) | EDB_PD2_LCDEN, PDDR); | |
406 | ||
407 | /* Delay for a little while. */ | |
408 | udelay(100); | |
409 | ||
410 | /* Power up the LCD DC-DC converter. */ | |
411 | clps_writeb(clps_readb(PDDR) | EDB_PD1_LCD_DC_DC_EN, PDDR); | |
412 | ||
413 | /* Turn on the LCD backlight. */ | |
414 | clps_writeb(clps_readb(PDDR) | EDB_PD3_LCDBL, PDDR); | |
415 | } | |
416 | ||
417 | err = register_framebuffer(cfb); | |
418 | ||
419 | out: return err; | |
420 | } | |
421 | ||
422 | static void __exit clps711xfb_exit(void) | |
423 | { | |
424 | unregister_framebuffer(cfb); | |
425 | kfree(cfb); | |
426 | ||
427 | /* | |
428 | * Power down the LCD | |
429 | */ | |
430 | if (machine_is_p720t()) { | |
431 | PLD_LCDEN = 0; | |
432 | PLD_PWR &= ~(PLD_S4_ON|PLD_S3_ON|PLD_S2_ON|PLD_S1_ON); | |
433 | } | |
434 | } | |
435 | ||
436 | module_init(clps711xfb_init); | |
437 | module_exit(clps711xfb_exit); | |
438 | ||
439 | MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>"); | |
440 | MODULE_DESCRIPTION("CLPS711x framebuffer driver"); | |
441 | MODULE_LICENSE("GPL"); |