1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25#include <linux/module.h>
26#include <linux/spinlock.h>
27#include <linux/interrupt.h>
28#include <linux/io.h>
29
30#include <linux/omap-dma.h>
31
32#include <mach/hardware.h>
33#include <mach/lcdc.h>
34
35int omap_lcd_dma_running(void)
36{
37
38
39
40
41 if (cpu_is_omap15xx())
42 if (omap_readw(OMAP_LCDC_CONTROL) & OMAP_LCDC_CTRL_LCD_EN)
43 return 1;
44
45
46 if (cpu_is_omap16xx())
47 if (omap_readw(OMAP1610_DMA_LCD_CCR) & OMAP_DMA_CCR_EN)
48 return 1;
49
50 return 0;
51}
52
53static struct lcd_dma_info {
54 spinlock_t lock;
55 int reserved;
56 void (*callback)(u16 status, void *data);
57 void *cb_data;
58
59 int active;
60 unsigned long addr;
61 int rotate, data_type, xres, yres;
62 int vxres;
63 int mirror;
64 int xscale, yscale;
65 int ext_ctrl;
66 int src_port;
67 int single_transfer;
68} lcd_dma;
69
70void omap_set_lcd_dma_b1(unsigned long addr, u16 fb_xres, u16 fb_yres,
71 int data_type)
72{
73 lcd_dma.addr = addr;
74 lcd_dma.data_type = data_type;
75 lcd_dma.xres = fb_xres;
76 lcd_dma.yres = fb_yres;
77}
78EXPORT_SYMBOL(omap_set_lcd_dma_b1);
79
80void omap_set_lcd_dma_ext_controller(int external)
81{
82 lcd_dma.ext_ctrl = external;
83}
84EXPORT_SYMBOL(omap_set_lcd_dma_ext_controller);
85
86void omap_set_lcd_dma_single_transfer(int single)
87{
88 lcd_dma.single_transfer = single;
89}
90EXPORT_SYMBOL(omap_set_lcd_dma_single_transfer);
91
92void omap_set_lcd_dma_b1_rotation(int rotate)
93{
94 if (cpu_is_omap15xx()) {
95 printk(KERN_ERR "DMA rotation is not supported in 1510 mode\n");
96 BUG();
97 return;
98 }
99 lcd_dma.rotate = rotate;
100}
101EXPORT_SYMBOL(omap_set_lcd_dma_b1_rotation);
102
103void omap_set_lcd_dma_b1_mirror(int mirror)
104{
105 if (cpu_is_omap15xx()) {
106 printk(KERN_ERR "DMA mirror is not supported in 1510 mode\n");
107 BUG();
108 }
109 lcd_dma.mirror = mirror;
110}
111EXPORT_SYMBOL(omap_set_lcd_dma_b1_mirror);
112
113void omap_set_lcd_dma_b1_vxres(unsigned long vxres)
114{
115 if (cpu_is_omap15xx()) {
116 pr_err("DMA virtual resolution is not supported in 1510 mode\n");
117 BUG();
118 }
119 lcd_dma.vxres = vxres;
120}
121EXPORT_SYMBOL(omap_set_lcd_dma_b1_vxres);
122
123void omap_set_lcd_dma_b1_scale(unsigned int xscale, unsigned int yscale)
124{
125 if (cpu_is_omap15xx()) {
126 printk(KERN_ERR "DMA scale is not supported in 1510 mode\n");
127 BUG();
128 }
129 lcd_dma.xscale = xscale;
130 lcd_dma.yscale = yscale;
131}
132EXPORT_SYMBOL(omap_set_lcd_dma_b1_scale);
133
134static void set_b1_regs(void)
135{
136 unsigned long top, bottom;
137 int es;
138 u16 w;
139 unsigned long en, fn;
140 long ei, fi;
141 unsigned long vxres;
142 unsigned int xscale, yscale;
143
144 switch (lcd_dma.data_type) {
145 case OMAP_DMA_DATA_TYPE_S8:
146 es = 1;
147 break;
148 case OMAP_DMA_DATA_TYPE_S16:
149 es = 2;
150 break;
151 case OMAP_DMA_DATA_TYPE_S32:
152 es = 4;
153 break;
154 default:
155 BUG();
156 return;
157 }
158
159 vxres = lcd_dma.vxres ? lcd_dma.vxres : lcd_dma.xres;
160 xscale = lcd_dma.xscale ? lcd_dma.xscale : 1;
161 yscale = lcd_dma.yscale ? lcd_dma.yscale : 1;
162 BUG_ON(vxres < lcd_dma.xres);
163
164#define PIXADDR(x, y) (lcd_dma.addr + \
165 ((y) * vxres * yscale + (x) * xscale) * es)
166#define PIXSTEP(sx, sy, dx, dy) (PIXADDR(dx, dy) - PIXADDR(sx, sy) - es + 1)
167
168 switch (lcd_dma.rotate) {
169 case 0:
170 if (!lcd_dma.mirror) {
171 top = PIXADDR(0, 0);
172 bottom = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
173
174
175 if (cpu_is_omap15xx() &&
176 lcd_dma.data_type == OMAP_DMA_DATA_TYPE_S32)
177 bottom += 2;
178 ei = PIXSTEP(0, 0, 1, 0);
179 fi = PIXSTEP(lcd_dma.xres - 1, 0, 0, 1);
180 } else {
181 top = PIXADDR(lcd_dma.xres - 1, 0);
182 bottom = PIXADDR(0, lcd_dma.yres - 1);
183 ei = PIXSTEP(1, 0, 0, 0);
184 fi = PIXSTEP(0, 0, lcd_dma.xres - 1, 1);
185 }
186 en = lcd_dma.xres;
187 fn = lcd_dma.yres;
188 break;
189 case 90:
190 if (!lcd_dma.mirror) {
191 top = PIXADDR(0, lcd_dma.yres - 1);
192 bottom = PIXADDR(lcd_dma.xres - 1, 0);
193 ei = PIXSTEP(0, 1, 0, 0);
194 fi = PIXSTEP(0, 0, 1, lcd_dma.yres - 1);
195 } else {
196 top = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
197 bottom = PIXADDR(0, 0);
198 ei = PIXSTEP(0, 1, 0, 0);
199 fi = PIXSTEP(1, 0, 0, lcd_dma.yres - 1);
200 }
201 en = lcd_dma.yres;
202 fn = lcd_dma.xres;
203 break;
204 case 180:
205 if (!lcd_dma.mirror) {
206 top = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
207 bottom = PIXADDR(0, 0);
208 ei = PIXSTEP(1, 0, 0, 0);
209 fi = PIXSTEP(0, 1, lcd_dma.xres - 1, 0);
210 } else {
211 top = PIXADDR(0, lcd_dma.yres - 1);
212 bottom = PIXADDR(lcd_dma.xres - 1, 0);
213 ei = PIXSTEP(0, 0, 1, 0);
214 fi = PIXSTEP(lcd_dma.xres - 1, 1, 0, 0);
215 }
216 en = lcd_dma.xres;
217 fn = lcd_dma.yres;
218 break;
219 case 270:
220 if (!lcd_dma.mirror) {
221 top = PIXADDR(lcd_dma.xres - 1, 0);
222 bottom = PIXADDR(0, lcd_dma.yres - 1);
223 ei = PIXSTEP(0, 0, 0, 1);
224 fi = PIXSTEP(1, lcd_dma.yres - 1, 0, 0);
225 } else {
226 top = PIXADDR(0, 0);
227 bottom = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
228 ei = PIXSTEP(0, 0, 0, 1);
229 fi = PIXSTEP(0, lcd_dma.yres - 1, 1, 0);
230 }
231 en = lcd_dma.yres;
232 fn = lcd_dma.xres;
233 break;
234 default:
235 BUG();
236 return;
237 }
238
239 if (cpu_is_omap15xx()) {
240 omap_writew(top >> 16, OMAP1510_DMA_LCD_TOP_F1_U);
241 omap_writew(top, OMAP1510_DMA_LCD_TOP_F1_L);
242 omap_writew(bottom >> 16, OMAP1510_DMA_LCD_BOT_F1_U);
243 omap_writew(bottom, OMAP1510_DMA_LCD_BOT_F1_L);
244
245 return;
246 }
247
248
249 omap_writew(top >> 16, OMAP1610_DMA_LCD_TOP_B1_U);
250 omap_writew(top, OMAP1610_DMA_LCD_TOP_B1_L);
251 omap_writew(bottom >> 16, OMAP1610_DMA_LCD_BOT_B1_U);
252 omap_writew(bottom, OMAP1610_DMA_LCD_BOT_B1_L);
253
254 omap_writew(en, OMAP1610_DMA_LCD_SRC_EN_B1);
255 omap_writew(fn, OMAP1610_DMA_LCD_SRC_FN_B1);
256
257 w = omap_readw(OMAP1610_DMA_LCD_CSDP);
258 w &= ~0x03;
259 w |= lcd_dma.data_type;
260 omap_writew(w, OMAP1610_DMA_LCD_CSDP);
261
262 w = omap_readw(OMAP1610_DMA_LCD_CTRL);
263
264 w &= ~(0x03 << 6);
265 if (lcd_dma.callback != NULL)
266 w |= 1 << 1;
267 else
268 w &= ~(1 << 1);
269 omap_writew(w, OMAP1610_DMA_LCD_CTRL);
270
271 if (!(lcd_dma.rotate || lcd_dma.mirror ||
272 lcd_dma.vxres || lcd_dma.xscale || lcd_dma.yscale))
273 return;
274
275 w = omap_readw(OMAP1610_DMA_LCD_CCR);
276
277 w |= (0x03 << 12);
278 omap_writew(w, OMAP1610_DMA_LCD_CCR);
279
280 omap_writew(ei, OMAP1610_DMA_LCD_SRC_EI_B1);
281 omap_writew(fi >> 16, OMAP1610_DMA_LCD_SRC_FI_B1_U);
282 omap_writew(fi, OMAP1610_DMA_LCD_SRC_FI_B1_L);
283}
284
285static irqreturn_t lcd_dma_irq_handler(int irq, void *dev_id)
286{
287 u16 w;
288
289 w = omap_readw(OMAP1610_DMA_LCD_CTRL);
290 if (unlikely(!(w & (1 << 3)))) {
291 printk(KERN_WARNING "Spurious LCD DMA IRQ\n");
292 return IRQ_NONE;
293 }
294
295 w |= (1 << 3);
296 omap_writew(w, OMAP1610_DMA_LCD_CTRL);
297 lcd_dma.active = 0;
298 if (lcd_dma.callback != NULL)
299 lcd_dma.callback(w, lcd_dma.cb_data);
300
301 return IRQ_HANDLED;
302}
303
304int omap_request_lcd_dma(void (*callback)(u16 status, void *data),
305 void *data)
306{
307 spin_lock_irq(&lcd_dma.lock);
308 if (lcd_dma.reserved) {
309 spin_unlock_irq(&lcd_dma.lock);
310 printk(KERN_ERR "LCD DMA channel already reserved\n");
311 BUG();
312 return -EBUSY;
313 }
314 lcd_dma.reserved = 1;
315 spin_unlock_irq(&lcd_dma.lock);
316 lcd_dma.callback = callback;
317 lcd_dma.cb_data = data;
318 lcd_dma.active = 0;
319 lcd_dma.single_transfer = 0;
320 lcd_dma.rotate = 0;
321 lcd_dma.vxres = 0;
322 lcd_dma.mirror = 0;
323 lcd_dma.xscale = 0;
324 lcd_dma.yscale = 0;
325 lcd_dma.ext_ctrl = 0;
326 lcd_dma.src_port = 0;
327
328 return 0;
329}
330EXPORT_SYMBOL(omap_request_lcd_dma);
331
332void omap_free_lcd_dma(void)
333{
334 spin_lock(&lcd_dma.lock);
335 if (!lcd_dma.reserved) {
336 spin_unlock(&lcd_dma.lock);
337 printk(KERN_ERR "LCD DMA is not reserved\n");
338 BUG();
339 return;
340 }
341 if (!cpu_is_omap15xx())
342 omap_writew(omap_readw(OMAP1610_DMA_LCD_CCR) & ~1,
343 OMAP1610_DMA_LCD_CCR);
344 lcd_dma.reserved = 0;
345 spin_unlock(&lcd_dma.lock);
346}
347EXPORT_SYMBOL(omap_free_lcd_dma);
348
349void omap_enable_lcd_dma(void)
350{
351 u16 w;
352
353
354
355
356
357
358 if (cpu_is_omap15xx() || !lcd_dma.ext_ctrl)
359 return;
360
361 w = omap_readw(OMAP1610_DMA_LCD_CTRL);
362 w |= 1 << 8;
363 omap_writew(w, OMAP1610_DMA_LCD_CTRL);
364
365 lcd_dma.active = 1;
366
367 w = omap_readw(OMAP1610_DMA_LCD_CCR);
368 w |= 1 << 7;
369 omap_writew(w, OMAP1610_DMA_LCD_CCR);
370}
371EXPORT_SYMBOL(omap_enable_lcd_dma);
372
373void omap_setup_lcd_dma(void)
374{
375 BUG_ON(lcd_dma.active);
376 if (!cpu_is_omap15xx()) {
377
378 omap_writew(0x5440, OMAP1610_DMA_LCD_CCR);
379 omap_writew(0x9102, OMAP1610_DMA_LCD_CSDP);
380 omap_writew(0x0004, OMAP1610_DMA_LCD_LCH_CTRL);
381 }
382 set_b1_regs();
383 if (!cpu_is_omap15xx()) {
384 u16 w;
385
386 w = omap_readw(OMAP1610_DMA_LCD_CCR);
387
388
389
390
391
392 w |= 1 << 11;
393 if (!lcd_dma.single_transfer)
394 w |= (3 << 8);
395 omap_writew(w, OMAP1610_DMA_LCD_CCR);
396 }
397}
398EXPORT_SYMBOL(omap_setup_lcd_dma);
399
400void omap_stop_lcd_dma(void)
401{
402 u16 w;
403
404 lcd_dma.active = 0;
405 if (cpu_is_omap15xx() || !lcd_dma.ext_ctrl)
406 return;
407
408 w = omap_readw(OMAP1610_DMA_LCD_CCR);
409 w &= ~(1 << 7);
410 omap_writew(w, OMAP1610_DMA_LCD_CCR);
411
412 w = omap_readw(OMAP1610_DMA_LCD_CTRL);
413 w &= ~(1 << 8);
414 omap_writew(w, OMAP1610_DMA_LCD_CTRL);
415}
416EXPORT_SYMBOL(omap_stop_lcd_dma);
417
418static int __init omap_init_lcd_dma(void)
419{
420 int r;
421
422 if (!cpu_class_is_omap1())
423 return -ENODEV;
424
425 if (cpu_is_omap16xx()) {
426 u16 w;
427
428
429 w = omap_readw(OMAP1610_DMA_LCD_CTRL);
430 w &= ~(1 << 8);
431 omap_writew(w, OMAP1610_DMA_LCD_CTRL);
432 }
433
434 spin_lock_init(&lcd_dma.lock);
435
436 r = request_irq(INT_DMA_LCD, lcd_dma_irq_handler, 0,
437 "LCD DMA", NULL);
438 if (r != 0)
439 pr_err("unable to request IRQ for LCD DMA (error %d)\n", r);
440
441 return r;
442}
443
444arch_initcall(omap_init_lcd_dma);
445
446
