2 * linux/arch/arm/mach-omap1/lcd_dma.c
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.
14 * Copyright (C) 2009 Texas Instruments
15 * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
17 * Support functions for the OMAP internal DMA channels.
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.
25 #include <linux/module.h>
26 #include <linux/spinlock.h>
27 #include <linux/interrupt.h>
32 #include <mach/hardware.h>
33 #include <mach/lcdc.h>
35 int omap_lcd_dma_running(void)
38 * On OMAP1510, internal LCD controller will start the transfer
39 * when it gets enabled, so assume DMA running if LCD enabled.
41 if (cpu_is_omap15xx())
42 if (omap_readw(OMAP_LCDC_CONTROL) & OMAP_LCDC_CTRL_LCD_EN)
45 /* Check if LCD DMA is running */
46 if (cpu_is_omap16xx())
47 if (omap_readw(OMAP1610_DMA_LCD_CCR) & OMAP_DMA_CCR_EN)
53 static struct lcd_dma_info {
56 void (*callback)(u16 status, void *data);
60 unsigned long addr, size;
61 int rotate, data_type, xres, yres;
70 void omap_set_lcd_dma_b1(unsigned long addr, u16 fb_xres, u16 fb_yres,
74 lcd_dma.data_type = data_type;
75 lcd_dma.xres = fb_xres;
76 lcd_dma.yres = fb_yres;
78 EXPORT_SYMBOL(omap_set_lcd_dma_b1);
80 void omap_set_lcd_dma_src_port(int port)
82 lcd_dma.src_port = port;
85 void omap_set_lcd_dma_ext_controller(int external)
87 lcd_dma.ext_ctrl = external;
89 EXPORT_SYMBOL(omap_set_lcd_dma_ext_controller);
91 void omap_set_lcd_dma_single_transfer(int single)
93 lcd_dma.single_transfer = single;
95 EXPORT_SYMBOL(omap_set_lcd_dma_single_transfer);
97 void omap_set_lcd_dma_b1_rotation(int rotate)
99 if (cpu_is_omap15xx()) {
100 printk(KERN_ERR "DMA rotation is not supported in 1510 mode\n");
104 lcd_dma.rotate = rotate;
106 EXPORT_SYMBOL(omap_set_lcd_dma_b1_rotation);
108 void omap_set_lcd_dma_b1_mirror(int mirror)
110 if (cpu_is_omap15xx()) {
111 printk(KERN_ERR "DMA mirror is not supported in 1510 mode\n");
114 lcd_dma.mirror = mirror;
116 EXPORT_SYMBOL(omap_set_lcd_dma_b1_mirror);
118 void omap_set_lcd_dma_b1_vxres(unsigned long vxres)
120 if (cpu_is_omap15xx()) {
121 printk(KERN_ERR "DMA virtual resolution is not supported "
125 lcd_dma.vxres = vxres;
127 EXPORT_SYMBOL(omap_set_lcd_dma_b1_vxres);
129 void omap_set_lcd_dma_b1_scale(unsigned int xscale, unsigned int yscale)
131 if (cpu_is_omap15xx()) {
132 printk(KERN_ERR "DMA scale is not supported in 1510 mode\n");
135 lcd_dma.xscale = xscale;
136 lcd_dma.yscale = yscale;
138 EXPORT_SYMBOL(omap_set_lcd_dma_b1_scale);
140 static void set_b1_regs(void)
142 unsigned long top, bottom;
145 unsigned long en, fn;
148 unsigned int xscale, yscale;
150 switch (lcd_dma.data_type) {
151 case OMAP_DMA_DATA_TYPE_S8:
154 case OMAP_DMA_DATA_TYPE_S16:
157 case OMAP_DMA_DATA_TYPE_S32:
165 vxres = lcd_dma.vxres ? lcd_dma.vxres : lcd_dma.xres;
166 xscale = lcd_dma.xscale ? lcd_dma.xscale : 1;
167 yscale = lcd_dma.yscale ? lcd_dma.yscale : 1;
168 BUG_ON(vxres < lcd_dma.xres);
170 #define PIXADDR(x, y) (lcd_dma.addr + \
171 ((y) * vxres * yscale + (x) * xscale) * es)
172 #define PIXSTEP(sx, sy, dx, dy) (PIXADDR(dx, dy) - PIXADDR(sx, sy) - es + 1)
174 switch (lcd_dma.rotate) {
176 if (!lcd_dma.mirror) {
178 bottom = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
179 /* 1510 DMA requires the bottom address to be 2 more
180 * than the actual last memory access location. */
181 if (cpu_is_omap15xx() &&
182 lcd_dma.data_type == OMAP_DMA_DATA_TYPE_S32)
184 ei = PIXSTEP(0, 0, 1, 0);
185 fi = PIXSTEP(lcd_dma.xres - 1, 0, 0, 1);
187 top = PIXADDR(lcd_dma.xres - 1, 0);
188 bottom = PIXADDR(0, lcd_dma.yres - 1);
189 ei = PIXSTEP(1, 0, 0, 0);
190 fi = PIXSTEP(0, 0, lcd_dma.xres - 1, 1);
196 if (!lcd_dma.mirror) {
197 top = PIXADDR(0, lcd_dma.yres - 1);
198 bottom = PIXADDR(lcd_dma.xres - 1, 0);
199 ei = PIXSTEP(0, 1, 0, 0);
200 fi = PIXSTEP(0, 0, 1, lcd_dma.yres - 1);
202 top = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
203 bottom = PIXADDR(0, 0);
204 ei = PIXSTEP(0, 1, 0, 0);
205 fi = PIXSTEP(1, 0, 0, lcd_dma.yres - 1);
211 if (!lcd_dma.mirror) {
212 top = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
213 bottom = PIXADDR(0, 0);
214 ei = PIXSTEP(1, 0, 0, 0);
215 fi = PIXSTEP(0, 1, lcd_dma.xres - 1, 0);
217 top = PIXADDR(0, lcd_dma.yres - 1);
218 bottom = PIXADDR(lcd_dma.xres - 1, 0);
219 ei = PIXSTEP(0, 0, 1, 0);
220 fi = PIXSTEP(lcd_dma.xres - 1, 1, 0, 0);
226 if (!lcd_dma.mirror) {
227 top = PIXADDR(lcd_dma.xres - 1, 0);
228 bottom = PIXADDR(0, lcd_dma.yres - 1);
229 ei = PIXSTEP(0, 0, 0, 1);
230 fi = PIXSTEP(1, lcd_dma.yres - 1, 0, 0);
233 bottom = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
234 ei = PIXSTEP(0, 0, 0, 1);
235 fi = PIXSTEP(0, lcd_dma.yres - 1, 1, 0);
242 return; /* Suppress warning about uninitialized vars */
245 if (cpu_is_omap15xx()) {
246 omap_writew(top >> 16, OMAP1510_DMA_LCD_TOP_F1_U);
247 omap_writew(top, OMAP1510_DMA_LCD_TOP_F1_L);
248 omap_writew(bottom >> 16, OMAP1510_DMA_LCD_BOT_F1_U);
249 omap_writew(bottom, OMAP1510_DMA_LCD_BOT_F1_L);
255 omap_writew(top >> 16, OMAP1610_DMA_LCD_TOP_B1_U);
256 omap_writew(top, OMAP1610_DMA_LCD_TOP_B1_L);
257 omap_writew(bottom >> 16, OMAP1610_DMA_LCD_BOT_B1_U);
258 omap_writew(bottom, OMAP1610_DMA_LCD_BOT_B1_L);
260 omap_writew(en, OMAP1610_DMA_LCD_SRC_EN_B1);
261 omap_writew(fn, OMAP1610_DMA_LCD_SRC_FN_B1);
263 w = omap_readw(OMAP1610_DMA_LCD_CSDP);
265 w |= lcd_dma.data_type;
266 omap_writew(w, OMAP1610_DMA_LCD_CSDP);
268 w = omap_readw(OMAP1610_DMA_LCD_CTRL);
269 /* Always set the source port as SDRAM for now*/
271 if (lcd_dma.callback != NULL)
272 w |= 1 << 1; /* Block interrupt enable */
275 omap_writew(w, OMAP1610_DMA_LCD_CTRL);
277 if (!(lcd_dma.rotate || lcd_dma.mirror ||
278 lcd_dma.vxres || lcd_dma.xscale || lcd_dma.yscale))
281 w = omap_readw(OMAP1610_DMA_LCD_CCR);
282 /* Set the double-indexed addressing mode */
284 omap_writew(w, OMAP1610_DMA_LCD_CCR);
286 omap_writew(ei, OMAP1610_DMA_LCD_SRC_EI_B1);
287 omap_writew(fi >> 16, OMAP1610_DMA_LCD_SRC_FI_B1_U);
288 omap_writew(fi, OMAP1610_DMA_LCD_SRC_FI_B1_L);
291 static irqreturn_t lcd_dma_irq_handler(int irq, void *dev_id)
295 w = omap_readw(OMAP1610_DMA_LCD_CTRL);
296 if (unlikely(!(w & (1 << 3)))) {
297 printk(KERN_WARNING "Spurious LCD DMA IRQ\n");
302 omap_writew(w, OMAP1610_DMA_LCD_CTRL);
304 if (lcd_dma.callback != NULL)
305 lcd_dma.callback(w, lcd_dma.cb_data);
310 int omap_request_lcd_dma(void (*callback)(u16 status, void *data),
313 spin_lock_irq(&lcd_dma.lock);
314 if (lcd_dma.reserved) {
315 spin_unlock_irq(&lcd_dma.lock);
316 printk(KERN_ERR "LCD DMA channel already reserved\n");
320 lcd_dma.reserved = 1;
321 spin_unlock_irq(&lcd_dma.lock);
322 lcd_dma.callback = callback;
323 lcd_dma.cb_data = data;
325 lcd_dma.single_transfer = 0;
331 lcd_dma.ext_ctrl = 0;
332 lcd_dma.src_port = 0;
336 EXPORT_SYMBOL(omap_request_lcd_dma);
338 void omap_free_lcd_dma(void)
340 spin_lock(&lcd_dma.lock);
341 if (!lcd_dma.reserved) {
342 spin_unlock(&lcd_dma.lock);
343 printk(KERN_ERR "LCD DMA is not reserved\n");
347 if (!cpu_is_omap15xx())
348 omap_writew(omap_readw(OMAP1610_DMA_LCD_CCR) & ~1,
349 OMAP1610_DMA_LCD_CCR);
350 lcd_dma.reserved = 0;
351 spin_unlock(&lcd_dma.lock);
353 EXPORT_SYMBOL(omap_free_lcd_dma);
355 void omap_enable_lcd_dma(void)
360 * Set the Enable bit only if an external controller is
361 * connected. Otherwise the OMAP internal controller will
362 * start the transfer when it gets enabled.
364 if (cpu_is_omap15xx() || !lcd_dma.ext_ctrl)
367 w = omap_readw(OMAP1610_DMA_LCD_CTRL);
369 omap_writew(w, OMAP1610_DMA_LCD_CTRL);
373 w = omap_readw(OMAP1610_DMA_LCD_CCR);
375 omap_writew(w, OMAP1610_DMA_LCD_CCR);
377 EXPORT_SYMBOL(omap_enable_lcd_dma);
379 void omap_setup_lcd_dma(void)
381 BUG_ON(lcd_dma.active);
382 if (!cpu_is_omap15xx()) {
383 /* Set some reasonable defaults */
384 omap_writew(0x5440, OMAP1610_DMA_LCD_CCR);
385 omap_writew(0x9102, OMAP1610_DMA_LCD_CSDP);
386 omap_writew(0x0004, OMAP1610_DMA_LCD_LCH_CTRL);
389 if (!cpu_is_omap15xx()) {
392 w = omap_readw(OMAP1610_DMA_LCD_CCR);
394 * If DMA was already active set the end_prog bit to have
395 * the programmed register set loaded into the active
398 w |= 1 << 11; /* End_prog */
399 if (!lcd_dma.single_transfer)
400 w |= (3 << 8); /* Auto_init, repeat */
401 omap_writew(w, OMAP1610_DMA_LCD_CCR);
404 EXPORT_SYMBOL(omap_setup_lcd_dma);
406 void omap_stop_lcd_dma(void)
411 if (cpu_is_omap15xx() || !lcd_dma.ext_ctrl)
414 w = omap_readw(OMAP1610_DMA_LCD_CCR);
416 omap_writew(w, OMAP1610_DMA_LCD_CCR);
418 w = omap_readw(OMAP1610_DMA_LCD_CTRL);
420 omap_writew(w, OMAP1610_DMA_LCD_CTRL);
422 EXPORT_SYMBOL(omap_stop_lcd_dma);
424 static int __init omap_init_lcd_dma(void)
428 if (!cpu_class_is_omap1())
431 if (cpu_is_omap16xx()) {
434 /* this would prevent OMAP sleep */
435 w = omap_readw(OMAP1610_DMA_LCD_CTRL);
437 omap_writew(w, OMAP1610_DMA_LCD_CTRL);
440 spin_lock_init(&lcd_dma.lock);
442 r = request_irq(INT_DMA_LCD, lcd_dma_irq_handler, 0,
445 printk(KERN_ERR "unable to request IRQ for LCD DMA "
451 arch_initcall(omap_init_lcd_dma);