1 /*
2 * linux/include/asm-arm/hardware/amba_clcd.h -- Integrator LCD panel.
3 *
4 * David A Rusling
5 *
6 * Copyright (C) 2001 ARM Limited
7 *
8 * This file is subject to the terms and conditions of the GNU General Public
9 * License. See the file COPYING in the main directory of this archive
10 * for more details.
11 */
12 #include <linux/fb.h>
13
14 /*
15 * CLCD Controller Internal Register addresses
16 */
17 #define CLCD_TIM0 0x00000000
18 #define CLCD_TIM1 0x00000004
19 #define CLCD_TIM2 0x00000008
20 #define CLCD_TIM3 0x0000000c
21 #define CLCD_UBAS 0x00000010
22 #define CLCD_LBAS 0x00000014
23
24 #define CLCD_PL110_IENB 0x00000018
25 #define CLCD_PL110_CNTL 0x0000001c
26 #define CLCD_PL110_STAT 0x00000020
27 #define CLCD_PL110_INTR 0x00000024
28 #define CLCD_PL110_UCUR 0x00000028
29 #define CLCD_PL110_LCUR 0x0000002C
30
31 #define CLCD_PL111_CNTL 0x00000018
32 #define CLCD_PL111_IENB 0x0000001c
33 #define CLCD_PL111_RIS 0x00000020
34 #define CLCD_PL111_MIS 0x00000024
35 #define CLCD_PL111_ICR 0x00000028
36 #define CLCD_PL111_UCUR 0x0000002c
37 #define CLCD_PL111_LCUR 0x00000030
38
39 #define CLCD_PALL 0x00000200
40 #define CLCD_PALETTE 0x00000200
41
42 #define TIM2_CLKSEL (1 << 5)
43 #define TIM2_IVS (1 << 11)
44 #define TIM2_IHS (1 << 12)
45 #define TIM2_IPC (1 << 13)
46 #define TIM2_IOE (1 << 14)
47 #define TIM2_BCD (1 << 26)
48
49 #define CNTL_LCDEN (1 << 0)
50 #define CNTL_LCDBPP1 (0 << 1)
51 #define CNTL_LCDBPP2 (1 << 1)
52 #define CNTL_LCDBPP4 (2 << 1)
53 #define CNTL_LCDBPP8 (3 << 1)
54 #define CNTL_LCDBPP16 (4 << 1)
55 #define CNTL_LCDBPP16_565 (6 << 1)
56 #define CNTL_LCDBPP16_444 (7 << 1)
57 #define CNTL_LCDBPP24 (5 << 1)
58 #define CNTL_LCDBW (1 << 4)
59 #define CNTL_LCDTFT (1 << 5)
60 #define CNTL_LCDMONO8 (1 << 6)
61 #define CNTL_LCDDUAL (1 << 7)
62 #define CNTL_BGR (1 << 8)
63 #define CNTL_BEBO (1 << 9)
64 #define CNTL_BEPO (1 << 10)
65 #define CNTL_LCDPWR (1 << 11)
66 #define CNTL_LCDVCOMP(x) ((x) << 12)
67 #define CNTL_LDMAFIFOTIME (1 << 15)
68 #define CNTL_WATERMARK (1 << 16)
69
70 enum {
71 /* individual formats */
72 CLCD_CAP_RGB444 = (1 << 0),
73 CLCD_CAP_RGB5551 = (1 << 1),
74 CLCD_CAP_RGB565 = (1 << 2),
75 CLCD_CAP_RGB888 = (1 << 3),
76 CLCD_CAP_BGR444 = (1 << 4),
77 CLCD_CAP_BGR5551 = (1 << 5),
78 CLCD_CAP_BGR565 = (1 << 6),
79 CLCD_CAP_BGR888 = (1 << 7),
80
81 /* connection layouts */
82 CLCD_CAP_444 = CLCD_CAP_RGB444 | CLCD_CAP_BGR444,
83 CLCD_CAP_5551 = CLCD_CAP_RGB5551 | CLCD_CAP_BGR5551,
84 CLCD_CAP_565 = CLCD_CAP_RGB565 | CLCD_CAP_BGR565,
85 CLCD_CAP_888 = CLCD_CAP_RGB888 | CLCD_CAP_BGR888,
86
87 /* red/blue ordering */
88 CLCD_CAP_RGB = CLCD_CAP_RGB444 | CLCD_CAP_RGB5551 |
89 CLCD_CAP_RGB565 | CLCD_CAP_RGB888,
90 CLCD_CAP_BGR = CLCD_CAP_BGR444 | CLCD_CAP_BGR5551 |
91 CLCD_CAP_BGR565 | CLCD_CAP_BGR888,
92
93 CLCD_CAP_ALL = CLCD_CAP_BGR | CLCD_CAP_RGB,
94 };
95
96 struct clcd_panel {
97 struct fb_videomode mode;
98 signed short width; /* width in mm */
99 signed short height; /* height in mm */
100 u32 tim2;
101 u32 tim3;
102 u32 cntl;
103 u32 caps;
104 unsigned int bpp:8,
105 fixedtimings:1,
106 grayscale:1;
107 unsigned int connector;
108 };
109
110 struct clcd_regs {
111 u32 tim0;
112 u32 tim1;
113 u32 tim2;
114 u32 tim3;
115 u32 cntl;
116 unsigned long pixclock;
117 };
118
119 struct clcd_fb;
120
121 /*
122 * the board-type specific routines
123 */
124 struct clcd_board {
125 const char *name;
126
127 /*
128 * Optional. Hardware capability flags.
129 */
130 u32 caps;
131
132 /*
133 * Optional. Check whether the var structure is acceptable
134 * for this display.
135 */
136 int (*check)(struct clcd_fb *fb, struct fb_var_screeninfo *var);
137
138 /*
139 * Compulsory. Decode fb->fb.var into regs->*. In the case of
140 * fixed timing, set regs->* to the register values required.
141 */
142 void (*decode)(struct clcd_fb *fb, struct clcd_regs *regs);
143
144 /*
145 * Optional. Disable any extra display hardware.
146 */
147 void (*disable)(struct clcd_fb *);
148
149 /*
150 * Optional. Enable any extra display hardware.
151 */
152 void (*enable)(struct clcd_fb *);
153
154 /*
155 * Setup platform specific parts of CLCD driver
156 */
157 int (*setup)(struct clcd_fb *);
158
159 /*
160 * mmap the framebuffer memory
161 */
162 int (*mmap)(struct clcd_fb *, struct vm_area_struct *);
163
164 /*
165 * Remove platform specific parts of CLCD driver
166 */
167 void (*remove)(struct clcd_fb *);
168 };
169
170 struct amba_device;
171 struct clk;
172
173 /* this data structure describes each frame buffer device we find */
174 struct clcd_fb {
175 struct fb_info fb;
176 struct amba_device *dev;
177 struct clk *clk;
178 struct clcd_panel *panel;
179 struct clcd_board *board;
180 void *board_data;
181 void __iomem *regs;
182 u16 off_ienb;
183 u16 off_cntl;
184 u32 clcd_cntl;
185 u32 cmap[16];
186 bool clk_enabled;
187 };
188
clcdfb_decode(struct clcd_fb * fb,struct clcd_regs * regs)189 static inline void clcdfb_decode(struct clcd_fb *fb, struct clcd_regs *regs)
190 {
191 struct fb_var_screeninfo *var = &fb->fb.var;
192 u32 val, cpl;
193
194 /*
195 * Program the CLCD controller registers and start the CLCD
196 */
197 val = ((var->xres / 16) - 1) << 2;
198 val |= (var->hsync_len - 1) << 8;
199 val |= (var->right_margin - 1) << 16;
200 val |= (var->left_margin - 1) << 24;
201 regs->tim0 = val;
202
203 val = var->yres;
204 if (fb->panel->cntl & CNTL_LCDDUAL)
205 val /= 2;
206 val -= 1;
207 val |= (var->vsync_len - 1) << 10;
208 val |= var->lower_margin << 16;
209 val |= var->upper_margin << 24;
210 regs->tim1 = val;
211
212 val = fb->panel->tim2;
213 val |= var->sync & FB_SYNC_HOR_HIGH_ACT ? 0 : TIM2_IHS;
214 val |= var->sync & FB_SYNC_VERT_HIGH_ACT ? 0 : TIM2_IVS;
215
216 cpl = var->xres_virtual;
217 if (fb->panel->cntl & CNTL_LCDTFT) /* TFT */
218 /* / 1 */;
219 else if (!var->grayscale) /* STN color */
220 cpl = cpl * 8 / 3;
221 else if (fb->panel->cntl & CNTL_LCDMONO8) /* STN monochrome, 8bit */
222 cpl /= 8;
223 else /* STN monochrome, 4bit */
224 cpl /= 4;
225
226 regs->tim2 = val | ((cpl - 1) << 16);
227
228 regs->tim3 = fb->panel->tim3;
229
230 val = fb->panel->cntl;
231 if (var->grayscale)
232 val |= CNTL_LCDBW;
233
234 if (fb->panel->caps && fb->board->caps &&
235 var->bits_per_pixel >= 16) {
236 /*
237 * if board and panel supply capabilities, we can support
238 * changing BGR/RGB depending on supplied parameters
239 */
240 if (var->red.offset == 0)
241 val &= ~CNTL_BGR;
242 else
243 val |= CNTL_BGR;
244 }
245
246 switch (var->bits_per_pixel) {
247 case 1:
248 val |= CNTL_LCDBPP1;
249 break;
250 case 2:
251 val |= CNTL_LCDBPP2;
252 break;
253 case 4:
254 val |= CNTL_LCDBPP4;
255 break;
256 case 8:
257 val |= CNTL_LCDBPP8;
258 break;
259 case 16:
260 /*
261 * PL110 cannot choose between 5551 and 565 modes in its
262 * control register. It is possible to use 565 with
263 * custom external wiring.
264 */
265 if (amba_part(fb->dev) == 0x110 ||
266 var->green.length == 5)
267 val |= CNTL_LCDBPP16;
268 else if (var->green.length == 6)
269 val |= CNTL_LCDBPP16_565;
270 else
271 val |= CNTL_LCDBPP16_444;
272 break;
273 case 32:
274 val |= CNTL_LCDBPP24;
275 break;
276 }
277
278 regs->cntl = val;
279 regs->pixclock = var->pixclock;
280 }
281
clcdfb_check(struct clcd_fb * fb,struct fb_var_screeninfo * var)282 static inline int clcdfb_check(struct clcd_fb *fb, struct fb_var_screeninfo *var)
283 {
284 var->xres_virtual = var->xres = (var->xres + 15) & ~15;
285 var->yres_virtual = var->yres = (var->yres + 1) & ~1;
286
287 #define CHECK(e,l,h) (var->e < l || var->e > h)
288 if (CHECK(right_margin, (5+1), 256) || /* back porch */
289 CHECK(left_margin, (5+1), 256) || /* front porch */
290 CHECK(hsync_len, (5+1), 256) ||
291 var->xres > 4096 ||
292 var->lower_margin > 255 || /* back porch */
293 var->upper_margin > 255 || /* front porch */
294 var->vsync_len > 32 ||
295 var->yres > 1024)
296 return -EINVAL;
297 #undef CHECK
298
299 /* single panel mode: PCD = max(PCD, 1) */
300 /* dual panel mode: PCD = max(PCD, 5) */
301
302 /*
303 * You can't change the grayscale setting, and
304 * we can only do non-interlaced video.
305 */
306 if (var->grayscale != fb->fb.var.grayscale ||
307 (var->vmode & FB_VMODE_MASK) != FB_VMODE_NONINTERLACED)
308 return -EINVAL;
309
310 #define CHECK(e) (var->e != fb->fb.var.e)
311 if (fb->panel->fixedtimings &&
312 (CHECK(xres) ||
313 CHECK(yres) ||
314 CHECK(bits_per_pixel) ||
315 CHECK(pixclock) ||
316 CHECK(left_margin) ||
317 CHECK(right_margin) ||
318 CHECK(upper_margin) ||
319 CHECK(lower_margin) ||
320 CHECK(hsync_len) ||
321 CHECK(vsync_len) ||
322 CHECK(sync)))
323 return -EINVAL;
324 #undef CHECK
325
326 var->nonstd = 0;
327 var->accel_flags = 0;
328
329 return 0;
330 }
331