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TOMOYO Linux Cross Reference
Linux/arch/arm/mach-omap1/lcd_dma.c

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  1 /*
  2  * linux/arch/arm/mach-omap1/lcd_dma.c
  3  *
  4  * Extracted from arch/arm/plat-omap/dma.c
  5  * Copyright (C) 2003 - 2008 Nokia Corporation
  6  * Author: Juha Yrjölä <juha.yrjola@nokia.com>
  7  * DMA channel linking for 1610 by Samuel Ortiz <samuel.ortiz@nokia.com>
  8  * Graphics DMA and LCD DMA graphics tranformations
  9  * by Imre Deak <imre.deak@nokia.com>
 10  * OMAP2/3 support Copyright (C) 2004-2007 Texas Instruments, Inc.
 11  * Merged to support both OMAP1 and OMAP2 by Tony Lindgren <tony@atomide.com>
 12  * Some functions based on earlier dma-omap.c Copyright (C) 2001 RidgeRun, Inc.
 13  *
 14  * Copyright (C) 2009 Texas Instruments
 15  * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
 16  *
 17  * Support functions for the OMAP internal DMA channels.
 18  *
 19  * This program is free software; you can redistribute it and/or modify
 20  * it under the terms of the GNU General Public License version 2 as
 21  * published by the Free Software Foundation.
 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 
 35 int omap_lcd_dma_running(void)
 36 {
 37         /*
 38          * On OMAP1510, internal LCD controller will start the transfer
 39          * when it gets enabled, so assume DMA running if LCD enabled.
 40          */
 41         if (cpu_is_omap15xx())
 42                 if (omap_readw(OMAP_LCDC_CONTROL) & OMAP_LCDC_CTRL_LCD_EN)
 43                         return 1;
 44 
 45         /* Check if LCD DMA is running */
 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 
 53 static 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 
 70 void 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 }
 78 EXPORT_SYMBOL(omap_set_lcd_dma_b1);
 79 
 80 void omap_set_lcd_dma_ext_controller(int external)
 81 {
 82         lcd_dma.ext_ctrl = external;
 83 }
 84 EXPORT_SYMBOL(omap_set_lcd_dma_ext_controller);
 85 
 86 void omap_set_lcd_dma_single_transfer(int single)
 87 {
 88         lcd_dma.single_transfer = single;
 89 }
 90 EXPORT_SYMBOL(omap_set_lcd_dma_single_transfer);
 91 
 92 void 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 }
101 EXPORT_SYMBOL(omap_set_lcd_dma_b1_rotation);
102 
103 void 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 }
111 EXPORT_SYMBOL(omap_set_lcd_dma_b1_mirror);
112 
113 void 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 }
121 EXPORT_SYMBOL(omap_set_lcd_dma_b1_vxres);
122 
123 void 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 }
132 EXPORT_SYMBOL(omap_set_lcd_dma_b1_scale);
133 
134 static 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                         /* 1510 DMA requires the bottom address to be 2 more
174                          * than the actual last memory access location. */
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; /* Suppress warning about uninitialized vars */
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         /* 1610 regs */
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         /* Always set the source port as SDRAM for now*/
264         w &= ~(0x03 << 6);
265         if (lcd_dma.callback != NULL)
266                 w |= 1 << 1;            /* Block interrupt enable */
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         /* Set the double-indexed addressing mode */
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 
285 static 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         /* Ack the IRQ */
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 
304 int 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 }
330 EXPORT_SYMBOL(omap_request_lcd_dma);
331 
332 void 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 }
347 EXPORT_SYMBOL(omap_free_lcd_dma);
348 
349 void omap_enable_lcd_dma(void)
350 {
351         u16 w;
352 
353         /*
354          * Set the Enable bit only if an external controller is
355          * connected. Otherwise the OMAP internal controller will
356          * start the transfer when it gets enabled.
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 }
371 EXPORT_SYMBOL(omap_enable_lcd_dma);
372 
373 void omap_setup_lcd_dma(void)
374 {
375         BUG_ON(lcd_dma.active);
376         if (!cpu_is_omap15xx()) {
377                 /* Set some reasonable defaults */
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                  * If DMA was already active set the end_prog bit to have
389                  * the programmed register set loaded into the active
390                  * register set.
391                  */
392                 w |= 1 << 11;           /* End_prog */
393                 if (!lcd_dma.single_transfer)
394                         w |= (3 << 8);  /* Auto_init, repeat */
395                 omap_writew(w, OMAP1610_DMA_LCD_CCR);
396         }
397 }
398 EXPORT_SYMBOL(omap_setup_lcd_dma);
399 
400 void 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 }
416 EXPORT_SYMBOL(omap_stop_lcd_dma);
417 
418 static 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                 /* this would prevent OMAP sleep */
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 
444 arch_initcall(omap_init_lcd_dma);
445 
446 

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