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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 | |
30 | #include <mach/hardware.h> |
31 | #include <asm/mach-types.h> |
32 | #include <linux/uaccess.h> |
33 | |
34 | #include <asm/hardware/clps7111.h> |
35 | #include <mach/syspld.h> |
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, |
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 | |
369 | cfb = kzalloc(sizeof(*cfb), GFP_KERNEL); |
370 | if (!cfb) |
371 | goto out; |
372 | |
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, |
384 | NULL); |
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"); |
442 |
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