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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> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/fb.h> | |
27 | #include <linux/init.h> | |
1da177e4 | 28 | #include <linux/delay.h> |
56cc6cb7 | 29 | #include <linux/platform_device.h> |
1da177e4 | 30 | |
a09e64fb | 31 | #include <mach/hardware.h> |
1da177e4 | 32 | #include <asm/mach-types.h> |
84902b7a | 33 | #include <linux/uaccess.h> |
1da177e4 | 34 | |
1da177e4 LT |
35 | struct fb_info *cfb; |
36 | ||
37 | #define CMAP_MAX_SIZE 16 | |
38 | ||
1da177e4 LT |
39 | /* |
40 | * LCD AC Prescale. This comes from the LCD panel manufacturers specifications. | |
41 | * This determines how many clocks + 1 of CL1 before the M signal toggles. | |
42 | * The number of lines on the display must not be divisible by this number. | |
43 | */ | |
44 | static unsigned int lcd_ac_prescale = 13; | |
45 | ||
46 | /* | |
47 | * Set a single color register. Return != 0 for invalid regno. | |
48 | */ | |
49 | static int | |
50 | clps7111fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue, | |
51 | u_int transp, struct fb_info *info) | |
52 | { | |
53 | unsigned int level, mask, shift, pal; | |
54 | ||
55 | if (regno >= (1 << info->var.bits_per_pixel)) | |
56 | return 1; | |
57 | ||
58 | /* gray = 0.30*R + 0.58*G + 0.11*B */ | |
59 | level = (red * 77 + green * 151 + blue * 28) >> 20; | |
60 | ||
61 | /* | |
62 | * On an LCD, a high value is dark, while a low value is light. | |
63 | * So we invert the level. | |
64 | * | |
65 | * This isn't true on all machines, so we only do it on EDB7211. | |
66 | * --rmk | |
67 | */ | |
68 | if (machine_is_edb7211()) { | |
69 | level = 15 - level; | |
70 | } | |
71 | ||
72 | shift = 4 * (regno & 7); | |
73 | level <<= shift; | |
74 | mask = 15 << shift; | |
75 | level &= mask; | |
76 | ||
77 | regno = regno < 8 ? PALLSW : PALMSW; | |
78 | ||
79 | pal = clps_readl(regno); | |
80 | pal = (pal & ~mask) | level; | |
81 | clps_writel(pal, regno); | |
82 | ||
83 | return 0; | |
84 | } | |
85 | ||
86 | /* | |
87 | * Validate the purposed mode. | |
88 | */ | |
89 | static int | |
90 | clps7111fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) | |
91 | { | |
92 | var->transp.msb_right = 0; | |
93 | var->transp.offset = 0; | |
94 | var->transp.length = 0; | |
95 | var->red.msb_right = 0; | |
96 | var->red.offset = 0; | |
97 | var->red.length = var->bits_per_pixel; | |
98 | var->green = var->red; | |
99 | var->blue = var->red; | |
100 | ||
101 | if (var->bits_per_pixel > 4) | |
102 | return -EINVAL; | |
103 | ||
104 | return 0; | |
105 | } | |
106 | ||
107 | /* | |
108 | * Set the hardware state. | |
109 | */ | |
110 | static int | |
111 | clps7111fb_set_par(struct fb_info *info) | |
112 | { | |
113 | unsigned int lcdcon, syscon, pixclock; | |
114 | ||
115 | switch (info->var.bits_per_pixel) { | |
116 | case 1: | |
117 | info->fix.visual = FB_VISUAL_MONO01; | |
118 | break; | |
119 | case 2: | |
120 | info->fix.visual = FB_VISUAL_PSEUDOCOLOR; | |
121 | break; | |
122 | case 4: | |
123 | info->fix.visual = FB_VISUAL_PSEUDOCOLOR; | |
124 | break; | |
125 | } | |
126 | ||
127 | info->fix.line_length = info->var.xres_virtual * info->var.bits_per_pixel / 8; | |
128 | ||
129 | lcdcon = (info->var.xres_virtual * info->var.yres_virtual * info->var.bits_per_pixel) / 128 - 1; | |
130 | lcdcon |= ((info->var.xres_virtual / 16) - 1) << 13; | |
131 | lcdcon |= lcd_ac_prescale << 25; | |
132 | ||
133 | /* | |
134 | * Calculate pixel prescale value from the pixclock. This is: | |
135 | * 36.864MHz / pixclock_mhz - 1. | |
136 | * However, pixclock is in picoseconds, so this ends up being: | |
137 | * 36864000 * pixclock_ps / 10^12 - 1 | |
138 | * and this will overflow the 32-bit math. We perform this as | |
139 | * (9 * 4096000 == 36864000): | |
140 | * pixclock_ps * 9 * (4096000 / 10^12) - 1 | |
141 | */ | |
142 | pixclock = 9 * info->var.pixclock / 244140 - 1; | |
143 | lcdcon |= pixclock << 19; | |
144 | ||
145 | if (info->var.bits_per_pixel == 4) | |
146 | lcdcon |= LCDCON_GSMD; | |
147 | if (info->var.bits_per_pixel >= 2) | |
148 | lcdcon |= LCDCON_GSEN; | |
149 | ||
150 | /* | |
151 | * LCDCON must only be changed while the LCD is disabled | |
152 | */ | |
153 | syscon = clps_readl(SYSCON1); | |
154 | clps_writel(syscon & ~SYSCON1_LCDEN, SYSCON1); | |
155 | clps_writel(lcdcon, LCDCON); | |
156 | clps_writel(syscon | SYSCON1_LCDEN, SYSCON1); | |
157 | return 0; | |
158 | } | |
159 | ||
160 | static int clps7111fb_blank(int blank, struct fb_info *info) | |
161 | { | |
94760bf2 AS |
162 | /* Enable/Disable LCD controller. */ |
163 | if (blank) | |
164 | clps_writel(clps_readl(SYSCON1) & ~SYSCON1_LCDEN, SYSCON1); | |
165 | else | |
166 | clps_writel(clps_readl(SYSCON1) | SYSCON1_LCDEN, SYSCON1); | |
167 | ||
1da177e4 LT |
168 | return 0; |
169 | } | |
170 | ||
171 | static struct fb_ops clps7111fb_ops = { | |
172 | .owner = THIS_MODULE, | |
173 | .fb_check_var = clps7111fb_check_var, | |
174 | .fb_set_par = clps7111fb_set_par, | |
175 | .fb_setcolreg = clps7111fb_setcolreg, | |
176 | .fb_blank = clps7111fb_blank, | |
177 | .fb_fillrect = cfb_fillrect, | |
178 | .fb_copyarea = cfb_copyarea, | |
179 | .fb_imageblit = cfb_imageblit, | |
1da177e4 LT |
180 | }; |
181 | ||
48c68c4f | 182 | static void clps711x_guess_lcd_params(struct fb_info *info) |
1da177e4 LT |
183 | { |
184 | unsigned int lcdcon, syscon, size; | |
185 | unsigned long phys_base = PAGE_OFFSET; | |
186 | void *virt_base = (void *)PAGE_OFFSET; | |
187 | ||
188 | info->var.xres_virtual = 640; | |
189 | info->var.yres_virtual = 240; | |
190 | info->var.bits_per_pixel = 4; | |
191 | info->var.activate = FB_ACTIVATE_NOW; | |
192 | info->var.height = -1; | |
193 | info->var.width = -1; | |
194 | info->var.pixclock = 93006; /* 10.752MHz pixel clock */ | |
195 | ||
196 | /* | |
197 | * If the LCD controller is already running, decode the values | |
198 | * in LCDCON to xres/yres/bpp/pixclock/acprescale | |
199 | */ | |
200 | syscon = clps_readl(SYSCON1); | |
201 | if (syscon & SYSCON1_LCDEN) { | |
202 | lcdcon = clps_readl(LCDCON); | |
203 | ||
204 | /* | |
205 | * Decode GSMD and GSEN bits to bits per pixel | |
206 | */ | |
207 | switch (lcdcon & (LCDCON_GSMD | LCDCON_GSEN)) { | |
208 | case LCDCON_GSMD | LCDCON_GSEN: | |
209 | info->var.bits_per_pixel = 4; | |
210 | break; | |
211 | ||
212 | case LCDCON_GSEN: | |
213 | info->var.bits_per_pixel = 2; | |
214 | break; | |
215 | ||
216 | default: | |
217 | info->var.bits_per_pixel = 1; | |
218 | break; | |
219 | } | |
220 | ||
221 | /* | |
222 | * Decode xres/yres | |
223 | */ | |
224 | info->var.xres_virtual = (((lcdcon >> 13) & 0x3f) + 1) * 16; | |
225 | info->var.yres_virtual = (((lcdcon & 0x1fff) + 1) * 128) / | |
226 | (info->var.xres_virtual * | |
227 | info->var.bits_per_pixel); | |
228 | ||
229 | /* | |
230 | * Calculate pixclock | |
231 | */ | |
232 | info->var.pixclock = (((lcdcon >> 19) & 0x3f) + 1) * 244140 / 9; | |
233 | ||
234 | /* | |
235 | * Grab AC prescale | |
236 | */ | |
237 | lcd_ac_prescale = (lcdcon >> 25) & 0x1f; | |
238 | } | |
239 | ||
240 | info->var.xres = info->var.xres_virtual; | |
241 | info->var.yres = info->var.yres_virtual; | |
242 | info->var.grayscale = info->var.bits_per_pixel > 1; | |
243 | ||
244 | size = info->var.xres * info->var.yres * info->var.bits_per_pixel / 8; | |
245 | ||
246 | /* | |
247 | * Might be worth checking to see if we can use the on-board | |
248 | * RAM if size here... | |
249 | * CLPS7110 - no on-board SRAM | |
250 | * EP7212 - 38400 bytes | |
251 | */ | |
252 | if (size <= 38400) { | |
253 | printk(KERN_INFO "CLPS711xFB: could use on-board SRAM?\n"); | |
254 | } | |
255 | ||
256 | if ((syscon & SYSCON1_LCDEN) == 0) { | |
257 | /* | |
258 | * The display isn't running. Ensure that | |
259 | * the display memory is empty. | |
260 | */ | |
261 | memset(virt_base, 0, size); | |
262 | } | |
263 | ||
264 | info->screen_base = virt_base; | |
265 | info->fix.smem_start = phys_base; | |
266 | info->fix.smem_len = PAGE_ALIGN(size); | |
267 | info->fix.type = FB_TYPE_PACKED_PIXELS; | |
268 | } | |
269 | ||
48c68c4f | 270 | static int clps711x_fb_probe(struct platform_device *pdev) |
1da177e4 LT |
271 | { |
272 | int err = -ENOMEM; | |
273 | ||
274 | if (fb_get_options("clps711xfb", NULL)) | |
275 | return -ENODEV; | |
276 | ||
dd00cc48 | 277 | cfb = kzalloc(sizeof(*cfb), GFP_KERNEL); |
1da177e4 LT |
278 | if (!cfb) |
279 | goto out; | |
280 | ||
1da177e4 LT |
281 | strcpy(cfb->fix.id, "clps711x"); |
282 | ||
283 | cfb->fbops = &clps7111fb_ops; | |
284 | cfb->flags = FBINFO_DEFAULT; | |
285 | ||
286 | clps711x_guess_lcd_params(cfb); | |
287 | ||
288 | fb_alloc_cmap(&cfb->cmap, CMAP_MAX_SIZE, 0); | |
289 | ||
1da177e4 LT |
290 | err = register_framebuffer(cfb); |
291 | ||
292 | out: return err; | |
293 | } | |
294 | ||
48c68c4f | 295 | static int clps711x_fb_remove(struct platform_device *pdev) |
1da177e4 LT |
296 | { |
297 | unregister_framebuffer(cfb); | |
298 | kfree(cfb); | |
299 | ||
dd850f12 | 300 | return 0; |
1da177e4 LT |
301 | } |
302 | ||
dd850f12 AS |
303 | static struct platform_driver clps711x_fb_driver = { |
304 | .driver = { | |
305 | .name = "video-clps711x", | |
dd850f12 AS |
306 | }, |
307 | .probe = clps711x_fb_probe, | |
48c68c4f | 308 | .remove = clps711x_fb_remove, |
dd850f12 AS |
309 | }; |
310 | module_platform_driver(clps711x_fb_driver); | |
1da177e4 LT |
311 | |
312 | MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>"); | |
dd850f12 | 313 | MODULE_DESCRIPTION("CLPS711X framebuffer driver"); |
1da177e4 | 314 | MODULE_LICENSE("GPL"); |