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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 | */ | |
fa1f136e | 22 | #include <linux/mm.h> |
1da177e4 LT |
23 | #include <linux/module.h> |
24 | #include <linux/kernel.h> | |
fa1f136e | 25 | #include <linux/seq_file.h> |
1da177e4 LT |
26 | #include <linux/slab.h> |
27 | #include <linux/fb.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/proc_fs.h> | |
30 | #include <linux/delay.h> | |
31 | ||
a09e64fb | 32 | #include <mach/hardware.h> |
1da177e4 | 33 | #include <asm/mach-types.h> |
84902b7a | 34 | #include <linux/uaccess.h> |
1da177e4 | 35 | |
a09e64fb | 36 | #include <mach/syspld.h> |
1da177e4 LT |
37 | |
38 | struct fb_info *cfb; | |
39 | ||
40 | #define CMAP_MAX_SIZE 16 | |
41 | ||
1da177e4 LT |
42 | /* |
43 | * LCD AC Prescale. This comes from the LCD panel manufacturers specifications. | |
44 | * This determines how many clocks + 1 of CL1 before the M signal toggles. | |
45 | * The number of lines on the display must not be divisible by this number. | |
46 | */ | |
47 | static unsigned int lcd_ac_prescale = 13; | |
48 | ||
49 | /* | |
50 | * Set a single color register. Return != 0 for invalid regno. | |
51 | */ | |
52 | static int | |
53 | clps7111fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue, | |
54 | u_int transp, struct fb_info *info) | |
55 | { | |
56 | unsigned int level, mask, shift, pal; | |
57 | ||
58 | if (regno >= (1 << info->var.bits_per_pixel)) | |
59 | return 1; | |
60 | ||
61 | /* gray = 0.30*R + 0.58*G + 0.11*B */ | |
62 | level = (red * 77 + green * 151 + blue * 28) >> 20; | |
63 | ||
64 | /* | |
65 | * On an LCD, a high value is dark, while a low value is light. | |
66 | * So we invert the level. | |
67 | * | |
68 | * This isn't true on all machines, so we only do it on EDB7211. | |
69 | * --rmk | |
70 | */ | |
71 | if (machine_is_edb7211()) { | |
72 | level = 15 - level; | |
73 | } | |
74 | ||
75 | shift = 4 * (regno & 7); | |
76 | level <<= shift; | |
77 | mask = 15 << shift; | |
78 | level &= mask; | |
79 | ||
80 | regno = regno < 8 ? PALLSW : PALMSW; | |
81 | ||
82 | pal = clps_readl(regno); | |
83 | pal = (pal & ~mask) | level; | |
84 | clps_writel(pal, regno); | |
85 | ||
86 | return 0; | |
87 | } | |
88 | ||
89 | /* | |
90 | * Validate the purposed mode. | |
91 | */ | |
92 | static int | |
93 | clps7111fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) | |
94 | { | |
95 | var->transp.msb_right = 0; | |
96 | var->transp.offset = 0; | |
97 | var->transp.length = 0; | |
98 | var->red.msb_right = 0; | |
99 | var->red.offset = 0; | |
100 | var->red.length = var->bits_per_pixel; | |
101 | var->green = var->red; | |
102 | var->blue = var->red; | |
103 | ||
104 | if (var->bits_per_pixel > 4) | |
105 | return -EINVAL; | |
106 | ||
107 | return 0; | |
108 | } | |
109 | ||
110 | /* | |
111 | * Set the hardware state. | |
112 | */ | |
113 | static int | |
114 | clps7111fb_set_par(struct fb_info *info) | |
115 | { | |
116 | unsigned int lcdcon, syscon, pixclock; | |
117 | ||
118 | switch (info->var.bits_per_pixel) { | |
119 | case 1: | |
120 | info->fix.visual = FB_VISUAL_MONO01; | |
121 | break; | |
122 | case 2: | |
123 | info->fix.visual = FB_VISUAL_PSEUDOCOLOR; | |
124 | break; | |
125 | case 4: | |
126 | info->fix.visual = FB_VISUAL_PSEUDOCOLOR; | |
127 | break; | |
128 | } | |
129 | ||
130 | info->fix.line_length = info->var.xres_virtual * info->var.bits_per_pixel / 8; | |
131 | ||
132 | lcdcon = (info->var.xres_virtual * info->var.yres_virtual * info->var.bits_per_pixel) / 128 - 1; | |
133 | lcdcon |= ((info->var.xres_virtual / 16) - 1) << 13; | |
134 | lcdcon |= lcd_ac_prescale << 25; | |
135 | ||
136 | /* | |
137 | * Calculate pixel prescale value from the pixclock. This is: | |
138 | * 36.864MHz / pixclock_mhz - 1. | |
139 | * However, pixclock is in picoseconds, so this ends up being: | |
140 | * 36864000 * pixclock_ps / 10^12 - 1 | |
141 | * and this will overflow the 32-bit math. We perform this as | |
142 | * (9 * 4096000 == 36864000): | |
143 | * pixclock_ps * 9 * (4096000 / 10^12) - 1 | |
144 | */ | |
145 | pixclock = 9 * info->var.pixclock / 244140 - 1; | |
146 | lcdcon |= pixclock << 19; | |
147 | ||
148 | if (info->var.bits_per_pixel == 4) | |
149 | lcdcon |= LCDCON_GSMD; | |
150 | if (info->var.bits_per_pixel >= 2) | |
151 | lcdcon |= LCDCON_GSEN; | |
152 | ||
153 | /* | |
154 | * LCDCON must only be changed while the LCD is disabled | |
155 | */ | |
156 | syscon = clps_readl(SYSCON1); | |
157 | clps_writel(syscon & ~SYSCON1_LCDEN, SYSCON1); | |
158 | clps_writel(lcdcon, LCDCON); | |
159 | clps_writel(syscon | SYSCON1_LCDEN, SYSCON1); | |
160 | return 0; | |
161 | } | |
162 | ||
163 | static int clps7111fb_blank(int blank, struct fb_info *info) | |
164 | { | |
165 | if (blank) { | |
166 | if (machine_is_edb7211()) { | |
167 | /* Turn off the LCD backlight. */ | |
168 | clps_writeb(clps_readb(PDDR) & ~EDB_PD3_LCDBL, PDDR); | |
169 | ||
170 | /* Power off the LCD DC-DC converter. */ | |
171 | clps_writeb(clps_readb(PDDR) & ~EDB_PD1_LCD_DC_DC_EN, PDDR); | |
172 | ||
173 | /* Delay for a little while (half a second). */ | |
174 | udelay(100); | |
175 | ||
176 | /* Power off the LCD panel. */ | |
177 | clps_writeb(clps_readb(PDDR) & ~EDB_PD2_LCDEN, PDDR); | |
178 | ||
179 | /* Power off the LCD controller. */ | |
180 | clps_writel(clps_readl(SYSCON1) & ~SYSCON1_LCDEN, | |
181 | SYSCON1); | |
182 | } | |
183 | } else { | |
184 | if (machine_is_edb7211()) { | |
185 | /* Power up the LCD controller. */ | |
186 | clps_writel(clps_readl(SYSCON1) | SYSCON1_LCDEN, | |
187 | SYSCON1); | |
188 | ||
189 | /* Power up the LCD panel. */ | |
190 | clps_writeb(clps_readb(PDDR) | EDB_PD2_LCDEN, PDDR); | |
191 | ||
192 | /* Delay for a little while. */ | |
193 | udelay(100); | |
194 | ||
195 | /* Power up the LCD DC-DC converter. */ | |
196 | clps_writeb(clps_readb(PDDR) | EDB_PD1_LCD_DC_DC_EN, | |
197 | PDDR); | |
198 | ||
199 | /* Turn on the LCD backlight. */ | |
200 | clps_writeb(clps_readb(PDDR) | EDB_PD3_LCDBL, PDDR); | |
201 | } | |
202 | } | |
203 | return 0; | |
204 | } | |
205 | ||
206 | static struct fb_ops clps7111fb_ops = { | |
207 | .owner = THIS_MODULE, | |
208 | .fb_check_var = clps7111fb_check_var, | |
209 | .fb_set_par = clps7111fb_set_par, | |
210 | .fb_setcolreg = clps7111fb_setcolreg, | |
211 | .fb_blank = clps7111fb_blank, | |
212 | .fb_fillrect = cfb_fillrect, | |
213 | .fb_copyarea = cfb_copyarea, | |
214 | .fb_imageblit = cfb_imageblit, | |
1da177e4 LT |
215 | }; |
216 | ||
fa1f136e | 217 | static int backlight_proc_show(struct seq_file *m, void *v) |
1da177e4 | 218 | { |
1da177e4 | 219 | if (machine_is_edb7211()) { |
fa1f136e | 220 | seq_printf(m, "%d\n", |
1da177e4 LT |
221 | (clps_readb(PDDR) & EDB_PD3_LCDBL) ? 1 : 0); |
222 | } | |
223 | ||
224 | return 0; | |
225 | } | |
226 | ||
fa1f136e AD |
227 | static int backlight_proc_open(struct inode *inode, struct file *file) |
228 | { | |
229 | return single_open(file, backlight_proc_show, NULL); | |
230 | } | |
231 | ||
232 | static ssize_t backlight_proc_write(struct file *file, const char *buffer, | |
233 | size_t count, loff_t *pos) | |
1da177e4 LT |
234 | { |
235 | unsigned char char_value; | |
236 | int value; | |
237 | ||
238 | if (count < 1) { | |
239 | return -EINVAL; | |
240 | } | |
241 | ||
242 | if (copy_from_user(&char_value, buffer, 1)) | |
243 | return -EFAULT; | |
244 | ||
245 | value = char_value - '0'; | |
246 | ||
247 | if (machine_is_edb7211()) { | |
248 | unsigned char port_d; | |
249 | ||
250 | port_d = clps_readb(PDDR); | |
251 | ||
252 | if (value) { | |
253 | port_d |= EDB_PD3_LCDBL; | |
254 | } else { | |
255 | port_d &= ~EDB_PD3_LCDBL; | |
256 | } | |
257 | ||
258 | clps_writeb(port_d, PDDR); | |
259 | } | |
260 | ||
261 | return count; | |
262 | } | |
263 | ||
fa1f136e AD |
264 | static const struct file_operations backlight_proc_fops = { |
265 | .owner = THIS_MODULE, | |
266 | .open = backlight_proc_open, | |
267 | .read = seq_read, | |
268 | .llseek = seq_lseek, | |
269 | .release = single_release, | |
270 | .write = backlight_proc_write, | |
271 | }; | |
272 | ||
1da177e4 LT |
273 | static void __init clps711x_guess_lcd_params(struct fb_info *info) |
274 | { | |
275 | unsigned int lcdcon, syscon, size; | |
276 | unsigned long phys_base = PAGE_OFFSET; | |
277 | void *virt_base = (void *)PAGE_OFFSET; | |
278 | ||
279 | info->var.xres_virtual = 640; | |
280 | info->var.yres_virtual = 240; | |
281 | info->var.bits_per_pixel = 4; | |
282 | info->var.activate = FB_ACTIVATE_NOW; | |
283 | info->var.height = -1; | |
284 | info->var.width = -1; | |
285 | info->var.pixclock = 93006; /* 10.752MHz pixel clock */ | |
286 | ||
287 | /* | |
288 | * If the LCD controller is already running, decode the values | |
289 | * in LCDCON to xres/yres/bpp/pixclock/acprescale | |
290 | */ | |
291 | syscon = clps_readl(SYSCON1); | |
292 | if (syscon & SYSCON1_LCDEN) { | |
293 | lcdcon = clps_readl(LCDCON); | |
294 | ||
295 | /* | |
296 | * Decode GSMD and GSEN bits to bits per pixel | |
297 | */ | |
298 | switch (lcdcon & (LCDCON_GSMD | LCDCON_GSEN)) { | |
299 | case LCDCON_GSMD | LCDCON_GSEN: | |
300 | info->var.bits_per_pixel = 4; | |
301 | break; | |
302 | ||
303 | case LCDCON_GSEN: | |
304 | info->var.bits_per_pixel = 2; | |
305 | break; | |
306 | ||
307 | default: | |
308 | info->var.bits_per_pixel = 1; | |
309 | break; | |
310 | } | |
311 | ||
312 | /* | |
313 | * Decode xres/yres | |
314 | */ | |
315 | info->var.xres_virtual = (((lcdcon >> 13) & 0x3f) + 1) * 16; | |
316 | info->var.yres_virtual = (((lcdcon & 0x1fff) + 1) * 128) / | |
317 | (info->var.xres_virtual * | |
318 | info->var.bits_per_pixel); | |
319 | ||
320 | /* | |
321 | * Calculate pixclock | |
322 | */ | |
323 | info->var.pixclock = (((lcdcon >> 19) & 0x3f) + 1) * 244140 / 9; | |
324 | ||
325 | /* | |
326 | * Grab AC prescale | |
327 | */ | |
328 | lcd_ac_prescale = (lcdcon >> 25) & 0x1f; | |
329 | } | |
330 | ||
331 | info->var.xres = info->var.xres_virtual; | |
332 | info->var.yres = info->var.yres_virtual; | |
333 | info->var.grayscale = info->var.bits_per_pixel > 1; | |
334 | ||
335 | size = info->var.xres * info->var.yres * info->var.bits_per_pixel / 8; | |
336 | ||
337 | /* | |
338 | * Might be worth checking to see if we can use the on-board | |
339 | * RAM if size here... | |
340 | * CLPS7110 - no on-board SRAM | |
341 | * EP7212 - 38400 bytes | |
342 | */ | |
343 | if (size <= 38400) { | |
344 | printk(KERN_INFO "CLPS711xFB: could use on-board SRAM?\n"); | |
345 | } | |
346 | ||
347 | if ((syscon & SYSCON1_LCDEN) == 0) { | |
348 | /* | |
349 | * The display isn't running. Ensure that | |
350 | * the display memory is empty. | |
351 | */ | |
352 | memset(virt_base, 0, size); | |
353 | } | |
354 | ||
355 | info->screen_base = virt_base; | |
356 | info->fix.smem_start = phys_base; | |
357 | info->fix.smem_len = PAGE_ALIGN(size); | |
358 | info->fix.type = FB_TYPE_PACKED_PIXELS; | |
359 | } | |
360 | ||
361 | int __init clps711xfb_init(void) | |
362 | { | |
363 | int err = -ENOMEM; | |
364 | ||
365 | if (fb_get_options("clps711xfb", NULL)) | |
366 | return -ENODEV; | |
367 | ||
dd00cc48 | 368 | cfb = kzalloc(sizeof(*cfb), GFP_KERNEL); |
1da177e4 LT |
369 | if (!cfb) |
370 | goto out; | |
371 | ||
1da177e4 LT |
372 | strcpy(cfb->fix.id, "clps711x"); |
373 | ||
374 | cfb->fbops = &clps7111fb_ops; | |
375 | cfb->flags = FBINFO_DEFAULT; | |
376 | ||
377 | clps711x_guess_lcd_params(cfb); | |
378 | ||
379 | fb_alloc_cmap(&cfb->cmap, CMAP_MAX_SIZE, 0); | |
380 | ||
fa1f136e | 381 | if (!proc_create("backlight", 0444, NULL, &backlight_proc_fops)) { |
1da177e4 LT |
382 | printk("Couldn't create the /proc entry for the backlight.\n"); |
383 | return -EINVAL; | |
384 | } | |
385 | ||
1da177e4 LT |
386 | /* |
387 | * Power up the LCD | |
388 | */ | |
389 | if (machine_is_p720t()) { | |
390 | PLD_LCDEN = PLD_LCDEN_EN; | |
391 | PLD_PWR |= (PLD_S4_ON|PLD_S3_ON|PLD_S2_ON|PLD_S1_ON); | |
392 | } | |
393 | ||
394 | if (machine_is_edb7211()) { | |
395 | /* Power up the LCD panel. */ | |
396 | clps_writeb(clps_readb(PDDR) | EDB_PD2_LCDEN, PDDR); | |
397 | ||
398 | /* Delay for a little while. */ | |
399 | udelay(100); | |
400 | ||
401 | /* Power up the LCD DC-DC converter. */ | |
402 | clps_writeb(clps_readb(PDDR) | EDB_PD1_LCD_DC_DC_EN, PDDR); | |
403 | ||
404 | /* Turn on the LCD backlight. */ | |
405 | clps_writeb(clps_readb(PDDR) | EDB_PD3_LCDBL, PDDR); | |
406 | } | |
407 | ||
408 | err = register_framebuffer(cfb); | |
409 | ||
410 | out: return err; | |
411 | } | |
412 | ||
413 | static void __exit clps711xfb_exit(void) | |
414 | { | |
415 | unregister_framebuffer(cfb); | |
416 | kfree(cfb); | |
417 | ||
418 | /* | |
419 | * Power down the LCD | |
420 | */ | |
421 | if (machine_is_p720t()) { | |
422 | PLD_LCDEN = 0; | |
423 | PLD_PWR &= ~(PLD_S4_ON|PLD_S3_ON|PLD_S2_ON|PLD_S1_ON); | |
424 | } | |
425 | } | |
426 | ||
427 | module_init(clps711xfb_init); | |
428 | module_exit(clps711xfb_exit); | |
429 | ||
430 | MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>"); | |
431 | MODULE_DESCRIPTION("CLPS711x framebuffer driver"); | |
432 | MODULE_LICENSE("GPL"); |