tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * drivers/video/tx3912fb.c
3 *
4 * Copyright (C) 1999 Harald Koerfgen
5 * Copyright (C) 2001 Steven Hill (sjhill@realitydiluted.com)
6 *
7 * This file is subject to the terms and conditions of the GNU General Public
8 * License. See the file COPYING in the main directory of this archive for
9 * more details.
10 *
11 * Framebuffer for LCD controller in TMPR3912/05 and PR31700 processors
12 */
13#include <linux/module.h>
14#include <linux/kernel.h>
15#include <linux/errno.h>
16#include <linux/string.h>
17#include <linux/delay.h>
18#include <linux/interrupt.h>
19#include <linux/init.h>
20#include <linux/pm.h>
21#include <linux/fb.h>
22#include <asm/io.h>
23#include <asm/bootinfo.h>
24#include <asm/uaccess.h>
25#include <asm/tx3912.h>
26#include <video/tx3912.h>
27
28/*
29 * Frame buffer, palette and console structures
30 */
31static struct fb_info fb_info;
32static u32 cfb8[16];
33
34static struct fb_fix_screeninfo tx3912fb_fix __initdata = {
35 .id = "tx3912fb",
36 .smem_len = ((240 * 320)/2),
37 .type = FB_TYPE_PACKED_PIXELS,
38 .visual = FB_VISUAL_TRUECOLOR,
39 .xpanstep = 1,
40 .ypanstep = 1,
41 .ywrapstep = 1,
42 .accel = FB_ACCEL_NONE,
43};
44
45static struct fb_var_screeninfo tx3912fb_var = {
46 .xres = 240,
47 .yres = 320,
48 .xres_virtual = 240,
49 .yres_virtual = 320,
50 .bits_per_pixel =4,
51 .red = { 0, 4, 0 }, /* ??? */
52 .green = { 0, 4, 0 },
53 .blue = { 0, 4, 0 },
54 .activate = FB_ACTIVATE_NOW,
55 .width = -1,
56 .height = -1,
57 .pixclock = 20000,
58 .left_margin = 64,
59 .right_margin = 64,
60 .upper_margin = 32,
61 .lower_margin = 32,
62 .hsync_len = 64,
63 .vsync_len = 2,
64 .vmode = FB_VMODE_NONINTERLACED,
65};
66
67/*
68 * Interface used by the world
69 */
70int tx3912fb_init(void);
71
72static int tx3912fb_setcolreg(u_int regno, u_int red, u_int green,
73 u_int blue, u_int transp,
74 struct fb_info *info);
75
76/*
77 * Macros
78 */
79#define get_line_length(xres_virtual, bpp) \
80 (u_long) (((int) xres_virtual * (int) bpp + 7) >> 3)
81
82/*
83 * Frame buffer operations structure used by console driver
84 */
85static struct fb_ops tx3912fb_ops = {
86 .owner = THIS_MODULE,
87 .fb_setcolreg = tx3912fb_setcolreg,
88 .fb_fillrect = cfb_fillrect,
89 .fb_copyarea = cfb_copyarea,
90 .fb_imageblit = cfb_imageblit,
91};
92
93static int tx3912fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
94{
95 /*
96 * Memory limit
97 */
98 line_length =
99 get_line_length(var->xres_virtual, var->bits_per_pixel);
100 if ((line_length * var->yres_virtual) > info->fix.smem_len)
101 return -ENOMEM;
102
103 return 0;
104}
105
106static int tx3912fb_set_par(struct fb_info *info)
107{
108 u_long tx3912fb_paddr = 0;
109
110 /* Disable the video logic */
111 outl(inl(TX3912_VIDEO_CTRL1) &
112 ~(TX3912_VIDEO_CTRL1_ENVID | TX3912_VIDEO_CTRL1_DISPON),
113 TX3912_VIDEO_CTRL1);
114 udelay(200);
115
116 /* Set start address for DMA transfer */
117 outl(tx3912fb_paddr, TX3912_VIDEO_CTRL3);
118
119 /* Set end address for DMA transfer */
120 outl((tx3912fb_paddr + tx3912fb_fix.smem_len + 1), TX3912_VIDEO_CTRL4);
121
122 /* Set the pixel depth */
123 switch (info->var.bits_per_pixel) {
124 case 1:
125 /* Monochrome */
126 outl(inl(TX3912_VIDEO_CTRL1) &
127 ~TX3912_VIDEO_CTRL1_BITSEL_MASK, TX3912_VIDEO_CTRL1);
128 info->fix.visual = FB_VISUAL_MONO10;
129 break;
130 case 4:
131 /* 4-bit gray */
132 outl(inl(TX3912_VIDEO_CTRL1) &
133 ~TX3912_VIDEO_CTRL1_BITSEL_MASK, TX3912_VIDEO_CTRL1);
134 outl(inl(TX3912_VIDEO_CTRL1) |
135 TX3912_VIDEO_CTRL1_BITSEL_4BIT_GRAY,
136 TX3912_VIDEO_CTRL1);
137 info->fix.visual = FB_VISUAL_TRUECOLOR;
138 break;
139 case 8:
140 /* 8-bit color */
141 outl(inl(TX3912_VIDEO_CTRL1) &
142 ~TX3912_VIDEO_CTRL1_BITSEL_MASK, TX3912_VIDEO_CTRL1);
143 outl(inl(TX3912_VIDEO_CTRL1) |
144 TX3912_VIDEO_CTRL1_BITSEL_8BIT_COLOR,
145 TX3912_VIDEO_CTRL1);
146 info->fix.visual = FB_VISUAL_TRUECOLOR;
147 break;
148 case 2:
149 default:
150 /* 2-bit gray */
151 outl(inl(TX3912_VIDEO_CTRL1) &
152 ~TX3912_VIDEO_CTRL1_BITSEL_MASK, TX3912_VIDEO_CTRL1);
153 outl(inl(TX3912_VIDEO_CTRL1) |
154 TX3912_VIDEO_CTRL1_BITSEL_2BIT_GRAY,
155 TX3912_VIDEO_CTRL1);
156 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
157 break;
158 }
159
160 /* Enable the video clock */
161 outl(inl(TX3912_CLK_CTRL) | TX3912_CLK_CTRL_ENVIDCLK,
162 TX3912_CLK_CTRL);
163
164 /* Unfreeze video logic and enable DF toggle */
165 outl(inl(TX3912_VIDEO_CTRL1) &
166 ~(TX3912_VIDEO_CTRL1_ENFREEZEFRAME |
167 TX3912_VIDEO_CTRL1_DFMODE)
168 , TX3912_VIDEO_CTRL1);
169 udelay(200);
170
171 /* Enable the video logic */
172 outl(inl(TX3912_VIDEO_CTRL1) |
173 (TX3912_VIDEO_CTRL1_ENVID | TX3912_VIDEO_CTRL1_DISPON),
174 TX3912_VIDEO_CTRL1);
175
176 info->fix.line_length = get_line_length(var->xres_virtual,
177 var->bits_per_pixel);
178}
179
180/*
181 * Set a single color register
182 */
183static int tx3912fb_setcolreg(u_int regno, u_int red, u_int green,
184 u_int blue, u_int transp,
185 struct fb_info *info)
186{
187 if (regno > 255)
188 return 1;
189
190 if (regno < 16)
191 ((u32 *)(info->pseudo_palette))[regno] = ((red & 0xe000) >> 8)
192 | ((green & 0xe000) >> 11)
193 | ((blue & 0xc000) >> 14);
194 return 0;
195}
196
197int __init tx3912fb_setup(char *options);
198
199/*
200 * Initialization of the framebuffer
201 */
202int __init tx3912fb_init(void)
203{
204 u_long tx3912fb_paddr = 0;
205 int size = (info->var.bits_per_pixel == 8) ? 256 : 16;
206 char *option = NULL;
207
208 if (fb_get_options("tx3912fb", &option))
209 return -ENODEV;
210 tx3912fb_setup(option);
211
212 /* Disable the video logic */
213 outl(inl(TX3912_VIDEO_CTRL1) &
214 ~(TX3912_VIDEO_CTRL1_ENVID | TX3912_VIDEO_CTRL1_DISPON),
215 TX3912_VIDEO_CTRL1);
216 udelay(200);
217
218 /* Set start address for DMA transfer */
219 outl(tx3912fb_paddr, TX3912_VIDEO_CTRL3);
220
221 /* Set end address for DMA transfer */
222 outl((tx3912fb_paddr + tx3912fb_fix.smem_len + 1), TX3912_VIDEO_CTRL4);
223
224 /* Set the pixel depth */
225 switch (tx3912fb_var.bits_per_pixel) {
226 case 1:
227 /* Monochrome */
228 outl(inl(TX3912_VIDEO_CTRL1) &
229 ~TX3912_VIDEO_CTRL1_BITSEL_MASK, TX3912_VIDEO_CTRL1);
230 tx3912fb_fix.visual = FB_VISUAL_MONO10;
231 break;
232 case 4:
233 /* 4-bit gray */
234 outl(inl(TX3912_VIDEO_CTRL1) &
235 ~TX3912_VIDEO_CTRL1_BITSEL_MASK, TX3912_VIDEO_CTRL1);
236 outl(inl(TX3912_VIDEO_CTRL1) |
237 TX3912_VIDEO_CTRL1_BITSEL_4BIT_GRAY,
238 TX3912_VIDEO_CTRL1);
239 tx3912fb_fix.visual = FB_VISUAL_TRUECOLOR;
240 tx3912fb_fix.grayscale = 1;
241 break;
242 case 8:
243 /* 8-bit color */
244 outl(inl(TX3912_VIDEO_CTRL1) &
245 ~TX3912_VIDEO_CTRL1_BITSEL_MASK, TX3912_VIDEO_CTRL1);
246 outl(inl(TX3912_VIDEO_CTRL1) |
247 TX3912_VIDEO_CTRL1_BITSEL_8BIT_COLOR,
248 TX3912_VIDEO_CTRL1);
249 tx3912fb_fix.visual = FB_VISUAL_TRUECOLOR;
250 break;
251 case 2:
252 default:
253 /* 2-bit gray */
254 outl(inl(TX3912_VIDEO_CTRL1) &
255 ~TX3912_VIDEO_CTRL1_BITSEL_MASK, TX3912_VIDEO_CTRL1);
256 outl(inl(TX3912_VIDEO_CTRL1) |
257 TX3912_VIDEO_CTRL1_BITSEL_2BIT_GRAY,
258 TX3912_VIDEO_CTRL1);
259 tx3912fb_fix.visual = FB_VISUAL_PSEUDOCOLOR;
260 tx3912fb_fix.grayscale = 1;
261 break;
262 }
263
264 /* Enable the video clock */
265 outl(inl(TX3912_CLK_CTRL) | TX3912_CLK_CTRL_ENVIDCLK,
266 TX3912_CLK_CTRL);
267
268 /* Unfreeze video logic and enable DF toggle */
269 outl(inl(TX3912_VIDEO_CTRL1) &
270 ~(TX3912_VIDEO_CTRL1_ENFREEZEFRAME | TX3912_VIDEO_CTRL1_DFMODE),
271 TX3912_VIDEO_CTRL1);
272 udelay(200);
273
274 /* Clear the framebuffer */
275 memset((void *) tx3912fb_fix.smem_start, 0xff, tx3912fb_fix.smem_len);
276 udelay(200);
277
278 /* Enable the video logic */
279 outl(inl(TX3912_VIDEO_CTRL1) |
280 (TX3912_VIDEO_CTRL1_ENVID | TX3912_VIDEO_CTRL1_DISPON),
281 TX3912_VIDEO_CTRL1);
282
283 /*
284 * Memory limit
285 */
286 tx3912fb_fix.line_length =
287 get_line_length(tx3912fb_var.xres_virtual, tx3912fb_var.bits_per_pixel);
288 if ((tx3912fb_fix.line_length * tx3912fb_var.yres_virtual) > tx3912fb_fix.smem_len)
289 return -ENOMEM;
290
291 fb_info.fbops = &tx3912fb_ops;
292 fb_info.var = tx3912fb_var;
293 fb_info.fix = tx3912fb_fix;
294 fb_info.pseudo_palette = pseudo_palette;
295 fb_info.flags = FBINFO_DEFAULT;
296
297 /* Clear the framebuffer */
298 memset((void *) fb_info.fix.smem_start, 0xff, fb_info.fix.smem_len);
299 udelay(200);
300
301 fb_alloc_cmap(&info->cmap, size, 0);
302
303 if (register_framebuffer(&fb_info) < 0)
304 return -1;
305
306 printk(KERN_INFO "fb%d: TX3912 frame buffer using %uKB.\n",
307 fb_info.node, (u_int) (fb_info.fix.smem_len >> 10));
308 return 0;
309}
310
311int __init tx3912fb_setup(char *options)
312{
313 char *this_opt;
314
315 if (!options || !*options)
316 return 0;
317
318 while ((this_opt = strsep(&options, ","))) {
319 if (!strncmp(options, "bpp:", 4))
320 tx3912fb_var.bits_per_pixel = simple_strtoul(options+4, NULL, 0);
321 }
322 return 0;
323}
324
325module_init(tx3912fb_init);
326MODULE_LICENSE("GPL");