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Nicolas Ferre14340582007-05-10 22:23:26 -07001/*
2 * Driver for AT91/AT32 LCD Controller
3 *
4 * Copyright (C) 2007 Atmel Corporation
5 *
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License. See the file COPYING in the main directory of this archive for
8 * more details.
9 */
10
11#include <linux/kernel.h>
12#include <linux/platform_device.h>
13#include <linux/dma-mapping.h>
14#include <linux/interrupt.h>
15#include <linux/clk.h>
16#include <linux/fb.h>
17#include <linux/init.h>
18#include <linux/delay.h>
David Brownella9a84c32008-02-06 01:39:26 -080019#include <linux/backlight.h>
Nicolas Ferre14340582007-05-10 22:23:26 -070020
Russell Kinga09e64f2008-08-05 16:14:15 +010021#include <mach/board.h>
22#include <mach/cpu.h>
23#include <mach/gpio.h>
Nicolas Ferre14340582007-05-10 22:23:26 -070024
25#include <video/atmel_lcdc.h>
26
27#define lcdc_readl(sinfo, reg) __raw_readl((sinfo)->mmio+(reg))
28#define lcdc_writel(sinfo, reg, val) __raw_writel((val), (sinfo)->mmio+(reg))
29
30/* configurable parameters */
31#define ATMEL_LCDC_CVAL_DEFAULT 0xc8
Nicolas Ferre53b74792009-05-28 14:34:36 -070032#define ATMEL_LCDC_DMA_BURST_LEN 8 /* words */
33#define ATMEL_LCDC_FIFO_SIZE 512 /* words */
Nicolas Ferre14340582007-05-10 22:23:26 -070034
35#if defined(CONFIG_ARCH_AT91)
Haavard Skinnemoene730d8b0a2008-08-12 15:08:56 -070036#define ATMEL_LCDFB_FBINFO_DEFAULT (FBINFO_DEFAULT \
37 | FBINFO_PARTIAL_PAN_OK \
38 | FBINFO_HWACCEL_YPAN)
Nicolas Ferre14340582007-05-10 22:23:26 -070039
40static inline void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info *sinfo,
41 struct fb_var_screeninfo *var)
42{
43
44}
45#elif defined(CONFIG_AVR32)
46#define ATMEL_LCDFB_FBINFO_DEFAULT (FBINFO_DEFAULT \
47 | FBINFO_PARTIAL_PAN_OK \
48 | FBINFO_HWACCEL_XPAN \
49 | FBINFO_HWACCEL_YPAN)
50
51static void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info *sinfo,
52 struct fb_var_screeninfo *var)
53{
54 u32 dma2dcfg;
55 u32 pixeloff;
56
57 pixeloff = (var->xoffset * var->bits_per_pixel) & 0x1f;
58
59 dma2dcfg = ((var->xres_virtual - var->xres) * var->bits_per_pixel) / 8;
60 dma2dcfg |= pixeloff << ATMEL_LCDC_PIXELOFF_OFFSET;
61 lcdc_writel(sinfo, ATMEL_LCDC_DMA2DCFG, dma2dcfg);
62
63 /* Update configuration */
64 lcdc_writel(sinfo, ATMEL_LCDC_DMACON,
65 lcdc_readl(sinfo, ATMEL_LCDC_DMACON)
66 | ATMEL_LCDC_DMAUPDT);
67}
68#endif
69
David Brownella9a84c32008-02-06 01:39:26 -080070static const u32 contrast_ctr = ATMEL_LCDC_PS_DIV8
71 | ATMEL_LCDC_POL_POSITIVE
72 | ATMEL_LCDC_ENA_PWMENABLE;
73
74#ifdef CONFIG_BACKLIGHT_ATMEL_LCDC
75
76/* some bl->props field just changed */
77static int atmel_bl_update_status(struct backlight_device *bl)
78{
79 struct atmel_lcdfb_info *sinfo = bl_get_data(bl);
80 int power = sinfo->bl_power;
81 int brightness = bl->props.brightness;
82
83 /* REVISIT there may be a meaningful difference between
84 * fb_blank and power ... there seem to be some cases
85 * this doesn't handle correctly.
86 */
87 if (bl->props.fb_blank != sinfo->bl_power)
88 power = bl->props.fb_blank;
89 else if (bl->props.power != sinfo->bl_power)
90 power = bl->props.power;
91
92 if (brightness < 0 && power == FB_BLANK_UNBLANK)
93 brightness = lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
94 else if (power != FB_BLANK_UNBLANK)
95 brightness = 0;
96
97 lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_VAL, brightness);
98 lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR,
99 brightness ? contrast_ctr : 0);
100
101 bl->props.fb_blank = bl->props.power = sinfo->bl_power = power;
102
103 return 0;
104}
105
106static int atmel_bl_get_brightness(struct backlight_device *bl)
107{
108 struct atmel_lcdfb_info *sinfo = bl_get_data(bl);
109
110 return lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
111}
112
113static struct backlight_ops atmel_lcdc_bl_ops = {
114 .update_status = atmel_bl_update_status,
115 .get_brightness = atmel_bl_get_brightness,
116};
117
118static void init_backlight(struct atmel_lcdfb_info *sinfo)
119{
120 struct backlight_device *bl;
121
122 sinfo->bl_power = FB_BLANK_UNBLANK;
123
124 if (sinfo->backlight)
125 return;
126
127 bl = backlight_device_register("backlight", &sinfo->pdev->dev,
128 sinfo, &atmel_lcdc_bl_ops);
Julien Brunelcf7b9a12008-11-19 15:36:07 -0800129 if (IS_ERR(bl)) {
David Brownella9a84c32008-02-06 01:39:26 -0800130 dev_err(&sinfo->pdev->dev, "error %ld on backlight register\n",
131 PTR_ERR(bl));
132 return;
133 }
134 sinfo->backlight = bl;
135
136 bl->props.power = FB_BLANK_UNBLANK;
137 bl->props.fb_blank = FB_BLANK_UNBLANK;
138 bl->props.max_brightness = 0xff;
139 bl->props.brightness = atmel_bl_get_brightness(bl);
140}
141
142static void exit_backlight(struct atmel_lcdfb_info *sinfo)
143{
144 if (sinfo->backlight)
145 backlight_device_unregister(sinfo->backlight);
146}
147
148#else
149
150static void init_backlight(struct atmel_lcdfb_info *sinfo)
151{
152 dev_warn(&sinfo->pdev->dev, "backlight control is not available\n");
153}
154
155static void exit_backlight(struct atmel_lcdfb_info *sinfo)
156{
157}
158
159#endif
160
161static void init_contrast(struct atmel_lcdfb_info *sinfo)
162{
163 /* have some default contrast/backlight settings */
164 lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, contrast_ctr);
165 lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_VAL, ATMEL_LCDC_CVAL_DEFAULT);
166
167 if (sinfo->lcdcon_is_backlight)
168 init_backlight(sinfo);
169}
170
Nicolas Ferre14340582007-05-10 22:23:26 -0700171
172static struct fb_fix_screeninfo atmel_lcdfb_fix __initdata = {
173 .type = FB_TYPE_PACKED_PIXELS,
174 .visual = FB_VISUAL_TRUECOLOR,
175 .xpanstep = 0,
Haavard Skinnemoene730d8b0a2008-08-12 15:08:56 -0700176 .ypanstep = 1,
Nicolas Ferre14340582007-05-10 22:23:26 -0700177 .ywrapstep = 0,
178 .accel = FB_ACCEL_NONE,
179};
180
Nicolas Ferre250a2692007-07-21 04:37:59 -0700181static unsigned long compute_hozval(unsigned long xres, unsigned long lcdcon2)
182{
183 unsigned long value;
184
185 if (!(cpu_is_at91sam9261() || cpu_is_at32ap7000()))
186 return xres;
187
188 value = xres;
189 if ((lcdcon2 & ATMEL_LCDC_DISTYPE) != ATMEL_LCDC_DISTYPE_TFT) {
190 /* STN display */
191 if ((lcdcon2 & ATMEL_LCDC_DISTYPE) == ATMEL_LCDC_DISTYPE_STNCOLOR) {
192 value *= 3;
193 }
194 if ( (lcdcon2 & ATMEL_LCDC_IFWIDTH) == ATMEL_LCDC_IFWIDTH_4
195 || ( (lcdcon2 & ATMEL_LCDC_IFWIDTH) == ATMEL_LCDC_IFWIDTH_8
196 && (lcdcon2 & ATMEL_LCDC_SCANMOD) == ATMEL_LCDC_SCANMOD_DUAL ))
197 value = DIV_ROUND_UP(value, 4);
198 else
199 value = DIV_ROUND_UP(value, 8);
200 }
201
202 return value;
203}
Nicolas Ferre14340582007-05-10 22:23:26 -0700204
Haavard Skinnemoen3aa04f12008-09-13 02:33:23 -0700205static void atmel_lcdfb_stop_nowait(struct atmel_lcdfb_info *sinfo)
206{
207 /* Turn off the LCD controller and the DMA controller */
208 lcdc_writel(sinfo, ATMEL_LCDC_PWRCON,
209 sinfo->guard_time << ATMEL_LCDC_GUARDT_OFFSET);
210
211 /* Wait for the LCDC core to become idle */
212 while (lcdc_readl(sinfo, ATMEL_LCDC_PWRCON) & ATMEL_LCDC_BUSY)
213 msleep(10);
214
215 lcdc_writel(sinfo, ATMEL_LCDC_DMACON, 0);
216}
217
218static void atmel_lcdfb_stop(struct atmel_lcdfb_info *sinfo)
219{
220 atmel_lcdfb_stop_nowait(sinfo);
221
222 /* Wait for DMA engine to become idle... */
223 while (lcdc_readl(sinfo, ATMEL_LCDC_DMACON) & ATMEL_LCDC_DMABUSY)
224 msleep(10);
225}
226
227static void atmel_lcdfb_start(struct atmel_lcdfb_info *sinfo)
228{
229 lcdc_writel(sinfo, ATMEL_LCDC_DMACON, sinfo->default_dmacon);
230 lcdc_writel(sinfo, ATMEL_LCDC_PWRCON,
231 (sinfo->guard_time << ATMEL_LCDC_GUARDT_OFFSET)
232 | ATMEL_LCDC_PWR);
233}
234
Nicolas Ferre14340582007-05-10 22:23:26 -0700235static void atmel_lcdfb_update_dma(struct fb_info *info,
236 struct fb_var_screeninfo *var)
237{
238 struct atmel_lcdfb_info *sinfo = info->par;
239 struct fb_fix_screeninfo *fix = &info->fix;
240 unsigned long dma_addr;
241
242 dma_addr = (fix->smem_start + var->yoffset * fix->line_length
243 + var->xoffset * var->bits_per_pixel / 8);
244
245 dma_addr &= ~3UL;
246
247 /* Set framebuffer DMA base address and pixel offset */
248 lcdc_writel(sinfo, ATMEL_LCDC_DMABADDR1, dma_addr);
249
250 atmel_lcdfb_update_dma2d(sinfo, var);
251}
252
253static inline void atmel_lcdfb_free_video_memory(struct atmel_lcdfb_info *sinfo)
254{
255 struct fb_info *info = sinfo->info;
256
257 dma_free_writecombine(info->device, info->fix.smem_len,
258 info->screen_base, info->fix.smem_start);
259}
260
261/**
262 * atmel_lcdfb_alloc_video_memory - Allocate framebuffer memory
263 * @sinfo: the frame buffer to allocate memory for
264 */
265static int atmel_lcdfb_alloc_video_memory(struct atmel_lcdfb_info *sinfo)
266{
267 struct fb_info *info = sinfo->info;
268 struct fb_var_screeninfo *var = &info->var;
Haavard Skinnemoenea757ac2008-08-12 15:08:57 -0700269 unsigned int smem_len;
Nicolas Ferre14340582007-05-10 22:23:26 -0700270
Haavard Skinnemoenea757ac2008-08-12 15:08:57 -0700271 smem_len = (var->xres_virtual * var->yres_virtual
272 * ((var->bits_per_pixel + 7) / 8));
273 info->fix.smem_len = max(smem_len, sinfo->smem_len);
Nicolas Ferre14340582007-05-10 22:23:26 -0700274
275 info->screen_base = dma_alloc_writecombine(info->device, info->fix.smem_len,
276 (dma_addr_t *)&info->fix.smem_start, GFP_KERNEL);
277
278 if (!info->screen_base) {
279 return -ENOMEM;
280 }
281
Haavard Skinnemoen01d3a5e2008-04-28 02:15:19 -0700282 memset(info->screen_base, 0, info->fix.smem_len);
283
Nicolas Ferre14340582007-05-10 22:23:26 -0700284 return 0;
285}
286
Nicolas Ferre968910b2008-07-23 21:31:34 -0700287static const struct fb_videomode *atmel_lcdfb_choose_mode(struct fb_var_screeninfo *var,
288 struct fb_info *info)
289{
290 struct fb_videomode varfbmode;
291 const struct fb_videomode *fbmode = NULL;
292
293 fb_var_to_videomode(&varfbmode, var);
294 fbmode = fb_find_nearest_mode(&varfbmode, &info->modelist);
295 if (fbmode)
296 fb_videomode_to_var(var, fbmode);
297 return fbmode;
298}
299
300
Nicolas Ferre14340582007-05-10 22:23:26 -0700301/**
302 * atmel_lcdfb_check_var - Validates a var passed in.
303 * @var: frame buffer variable screen structure
304 * @info: frame buffer structure that represents a single frame buffer
305 *
306 * Checks to see if the hardware supports the state requested by
307 * var passed in. This function does not alter the hardware
308 * state!!! This means the data stored in struct fb_info and
309 * struct atmel_lcdfb_info do not change. This includes the var
310 * inside of struct fb_info. Do NOT change these. This function
311 * can be called on its own if we intent to only test a mode and
312 * not actually set it. The stuff in modedb.c is a example of
313 * this. If the var passed in is slightly off by what the
314 * hardware can support then we alter the var PASSED in to what
315 * we can do. If the hardware doesn't support mode change a
316 * -EINVAL will be returned by the upper layers. You don't need
317 * to implement this function then. If you hardware doesn't
318 * support changing the resolution then this function is not
319 * needed. In this case the driver would just provide a var that
320 * represents the static state the screen is in.
321 *
322 * Returns negative errno on error, or zero on success.
323 */
324static int atmel_lcdfb_check_var(struct fb_var_screeninfo *var,
325 struct fb_info *info)
326{
327 struct device *dev = info->device;
328 struct atmel_lcdfb_info *sinfo = info->par;
329 unsigned long clk_value_khz;
330
331 clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000;
332
333 dev_dbg(dev, "%s:\n", __func__);
Nicolas Ferre968910b2008-07-23 21:31:34 -0700334
335 if (!(var->pixclock && var->bits_per_pixel)) {
336 /* choose a suitable mode if possible */
337 if (!atmel_lcdfb_choose_mode(var, info)) {
338 dev_err(dev, "needed value not specified\n");
339 return -EINVAL;
340 }
341 }
342
Nicolas Ferre14340582007-05-10 22:23:26 -0700343 dev_dbg(dev, " resolution: %ux%u\n", var->xres, var->yres);
344 dev_dbg(dev, " pixclk: %lu KHz\n", PICOS2KHZ(var->pixclock));
345 dev_dbg(dev, " bpp: %u\n", var->bits_per_pixel);
346 dev_dbg(dev, " clk: %lu KHz\n", clk_value_khz);
347
Ben Nizette97b9a5a2009-06-16 15:34:24 -0700348 if (PICOS2KHZ(var->pixclock) > clk_value_khz) {
Nicolas Ferre14340582007-05-10 22:23:26 -0700349 dev_err(dev, "%lu KHz pixel clock is too fast\n", PICOS2KHZ(var->pixclock));
350 return -EINVAL;
351 }
352
Nicolas Ferre968910b2008-07-23 21:31:34 -0700353 /* Do not allow to have real resoulution larger than virtual */
354 if (var->xres > var->xres_virtual)
355 var->xres_virtual = var->xres;
356
357 if (var->yres > var->yres_virtual)
358 var->yres_virtual = var->yres;
359
Nicolas Ferre14340582007-05-10 22:23:26 -0700360 /* Force same alignment for each line */
361 var->xres = (var->xres + 3) & ~3UL;
362 var->xres_virtual = (var->xres_virtual + 3) & ~3UL;
363
364 var->red.msb_right = var->green.msb_right = var->blue.msb_right = 0;
365 var->transp.msb_right = 0;
366 var->transp.offset = var->transp.length = 0;
367 var->xoffset = var->yoffset = 0;
368
Stanislaw Gruszkaf928ac0a2008-10-15 22:03:43 -0700369 if (info->fix.smem_len) {
370 unsigned int smem_len = (var->xres_virtual * var->yres_virtual
371 * ((var->bits_per_pixel + 7) / 8));
372 if (smem_len > info->fix.smem_len)
373 return -EINVAL;
374 }
375
Haavard Skinnemoen162b3a02008-02-06 01:39:11 -0800376 /* Saturate vertical and horizontal timings at maximum values */
377 var->vsync_len = min_t(u32, var->vsync_len,
378 (ATMEL_LCDC_VPW >> ATMEL_LCDC_VPW_OFFSET) + 1);
379 var->upper_margin = min_t(u32, var->upper_margin,
380 ATMEL_LCDC_VBP >> ATMEL_LCDC_VBP_OFFSET);
381 var->lower_margin = min_t(u32, var->lower_margin,
382 ATMEL_LCDC_VFP);
383 var->right_margin = min_t(u32, var->right_margin,
384 (ATMEL_LCDC_HFP >> ATMEL_LCDC_HFP_OFFSET) + 1);
385 var->hsync_len = min_t(u32, var->hsync_len,
386 (ATMEL_LCDC_HPW >> ATMEL_LCDC_HPW_OFFSET) + 1);
387 var->left_margin = min_t(u32, var->left_margin,
388 ATMEL_LCDC_HBP + 1);
389
390 /* Some parameters can't be zero */
391 var->vsync_len = max_t(u32, var->vsync_len, 1);
392 var->right_margin = max_t(u32, var->right_margin, 1);
393 var->hsync_len = max_t(u32, var->hsync_len, 1);
394 var->left_margin = max_t(u32, var->left_margin, 1);
395
Nicolas Ferre14340582007-05-10 22:23:26 -0700396 switch (var->bits_per_pixel) {
Nicolas Ferre250a2692007-07-21 04:37:59 -0700397 case 1:
Nicolas Ferre14340582007-05-10 22:23:26 -0700398 case 2:
399 case 4:
400 case 8:
401 var->red.offset = var->green.offset = var->blue.offset = 0;
402 var->red.length = var->green.length = var->blue.length
403 = var->bits_per_pixel;
404 break;
405 case 15:
406 case 16:
Nicolas Ferrefd085802008-04-28 02:15:21 -0700407 if (sinfo->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) {
408 /* RGB:565 mode */
409 var->red.offset = 11;
410 var->blue.offset = 0;
411 var->green.length = 6;
Guillaume GARDETfbd03a12008-08-29 10:11:24 +0100412 } else if (sinfo->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB555) {
413 var->red.offset = 10;
414 var->blue.offset = 0;
415 var->green.length = 5;
Nicolas Ferrefd085802008-04-28 02:15:21 -0700416 } else {
417 /* BGR:555 mode */
418 var->red.offset = 0;
419 var->blue.offset = 10;
420 var->green.length = 5;
421 }
Nicolas Ferre14340582007-05-10 22:23:26 -0700422 var->green.offset = 5;
Nicolas Ferrefd085802008-04-28 02:15:21 -0700423 var->red.length = var->blue.length = 5;
Nicolas Ferre14340582007-05-10 22:23:26 -0700424 break;
Nicolas Ferre14340582007-05-10 22:23:26 -0700425 case 32:
Haavard Skinnemoen4440e0e2007-07-21 04:38:02 -0700426 var->transp.offset = 24;
427 var->transp.length = 8;
428 /* fall through */
429 case 24:
Nicolas Ferrefd085802008-04-28 02:15:21 -0700430 if (sinfo->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) {
431 /* RGB:888 mode */
432 var->red.offset = 16;
433 var->blue.offset = 0;
434 } else {
435 /* BGR:888 mode */
436 var->red.offset = 0;
437 var->blue.offset = 16;
438 }
Nicolas Ferre14340582007-05-10 22:23:26 -0700439 var->green.offset = 8;
Nicolas Ferre14340582007-05-10 22:23:26 -0700440 var->red.length = var->green.length = var->blue.length = 8;
441 break;
442 default:
443 dev_err(dev, "color depth %d not supported\n",
444 var->bits_per_pixel);
445 return -EINVAL;
446 }
447
448 return 0;
449}
450
Nicolas Ferred22579b2008-07-23 21:31:20 -0700451/*
452 * LCD reset sequence
453 */
454static void atmel_lcdfb_reset(struct atmel_lcdfb_info *sinfo)
455{
456 might_sleep();
457
Haavard Skinnemoen3aa04f12008-09-13 02:33:23 -0700458 atmel_lcdfb_stop(sinfo);
459 atmel_lcdfb_start(sinfo);
Nicolas Ferred22579b2008-07-23 21:31:20 -0700460}
461
Nicolas Ferre14340582007-05-10 22:23:26 -0700462/**
463 * atmel_lcdfb_set_par - Alters the hardware state.
464 * @info: frame buffer structure that represents a single frame buffer
465 *
466 * Using the fb_var_screeninfo in fb_info we set the resolution
467 * of the this particular framebuffer. This function alters the
468 * par AND the fb_fix_screeninfo stored in fb_info. It doesn't
469 * not alter var in fb_info since we are using that data. This
470 * means we depend on the data in var inside fb_info to be
471 * supported by the hardware. atmel_lcdfb_check_var is always called
472 * before atmel_lcdfb_set_par to ensure this. Again if you can't
473 * change the resolution you don't need this function.
474 *
475 */
476static int atmel_lcdfb_set_par(struct fb_info *info)
477{
478 struct atmel_lcdfb_info *sinfo = info->par;
Nicolas Ferre250a2692007-07-21 04:37:59 -0700479 unsigned long hozval_linesz;
Nicolas Ferre14340582007-05-10 22:23:26 -0700480 unsigned long value;
481 unsigned long clk_value_khz;
Nicolas Ferre250a2692007-07-21 04:37:59 -0700482 unsigned long bits_per_line;
Nicolas Ferre14340582007-05-10 22:23:26 -0700483
Nicolas Ferred22579b2008-07-23 21:31:20 -0700484 might_sleep();
485
Nicolas Ferre14340582007-05-10 22:23:26 -0700486 dev_dbg(info->device, "%s:\n", __func__);
487 dev_dbg(info->device, " * resolution: %ux%u (%ux%u virtual)\n",
488 info->var.xres, info->var.yres,
489 info->var.xres_virtual, info->var.yres_virtual);
490
Haavard Skinnemoen3aa04f12008-09-13 02:33:23 -0700491 atmel_lcdfb_stop_nowait(sinfo);
Nicolas Ferre14340582007-05-10 22:23:26 -0700492
Nicolas Ferre250a2692007-07-21 04:37:59 -0700493 if (info->var.bits_per_pixel == 1)
494 info->fix.visual = FB_VISUAL_MONO01;
495 else if (info->var.bits_per_pixel <= 8)
Nicolas Ferre14340582007-05-10 22:23:26 -0700496 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
497 else
498 info->fix.visual = FB_VISUAL_TRUECOLOR;
499
Nicolas Ferre250a2692007-07-21 04:37:59 -0700500 bits_per_line = info->var.xres_virtual * info->var.bits_per_pixel;
501 info->fix.line_length = DIV_ROUND_UP(bits_per_line, 8);
Nicolas Ferre14340582007-05-10 22:23:26 -0700502
503 /* Re-initialize the DMA engine... */
504 dev_dbg(info->device, " * update DMA engine\n");
505 atmel_lcdfb_update_dma(info, &info->var);
506
507 /* ...set frame size and burst length = 8 words (?) */
508 value = (info->var.yres * info->var.xres * info->var.bits_per_pixel) / 32;
509 value |= ((ATMEL_LCDC_DMA_BURST_LEN - 1) << ATMEL_LCDC_BLENGTH_OFFSET);
510 lcdc_writel(sinfo, ATMEL_LCDC_DMAFRMCFG, value);
511
512 /* Now, the LCDC core... */
513
514 /* Set pixel clock */
515 clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000;
516
Nicolas Ferre250a2692007-07-21 04:37:59 -0700517 value = DIV_ROUND_UP(clk_value_khz, PICOS2KHZ(info->var.pixclock));
Nicolas Ferre14340582007-05-10 22:23:26 -0700518
Nicolas Ferrebaf63322008-05-12 14:02:25 -0700519 if (value < 2) {
Nicolas Ferre14340582007-05-10 22:23:26 -0700520 dev_notice(info->device, "Bypassing pixel clock divider\n");
521 lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1, ATMEL_LCDC_BYPASS);
Nicolas Ferre250a2692007-07-21 04:37:59 -0700522 } else {
Nicolas Ferrebaf63322008-05-12 14:02:25 -0700523 value = (value / 2) - 1;
524 dev_dbg(info->device, " * programming CLKVAL = 0x%08lx\n",
525 value);
526 lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1,
527 value << ATMEL_LCDC_CLKVAL_OFFSET);
Nicolas Ferre250a2692007-07-21 04:37:59 -0700528 info->var.pixclock = KHZ2PICOS(clk_value_khz / (2 * (value + 1)));
529 dev_dbg(info->device, " updated pixclk: %lu KHz\n",
530 PICOS2KHZ(info->var.pixclock));
531 }
532
Nicolas Ferre14340582007-05-10 22:23:26 -0700533
534 /* Initialize control register 2 */
535 value = sinfo->default_lcdcon2;
536
537 if (!(info->var.sync & FB_SYNC_HOR_HIGH_ACT))
538 value |= ATMEL_LCDC_INVLINE_INVERTED;
539 if (!(info->var.sync & FB_SYNC_VERT_HIGH_ACT))
540 value |= ATMEL_LCDC_INVFRAME_INVERTED;
541
542 switch (info->var.bits_per_pixel) {
543 case 1: value |= ATMEL_LCDC_PIXELSIZE_1; break;
544 case 2: value |= ATMEL_LCDC_PIXELSIZE_2; break;
545 case 4: value |= ATMEL_LCDC_PIXELSIZE_4; break;
546 case 8: value |= ATMEL_LCDC_PIXELSIZE_8; break;
547 case 15: /* fall through */
548 case 16: value |= ATMEL_LCDC_PIXELSIZE_16; break;
549 case 24: value |= ATMEL_LCDC_PIXELSIZE_24; break;
550 case 32: value |= ATMEL_LCDC_PIXELSIZE_32; break;
551 default: BUG(); break;
552 }
553 dev_dbg(info->device, " * LCDCON2 = %08lx\n", value);
554 lcdc_writel(sinfo, ATMEL_LCDC_LCDCON2, value);
555
556 /* Vertical timing */
557 value = (info->var.vsync_len - 1) << ATMEL_LCDC_VPW_OFFSET;
558 value |= info->var.upper_margin << ATMEL_LCDC_VBP_OFFSET;
559 value |= info->var.lower_margin;
560 dev_dbg(info->device, " * LCDTIM1 = %08lx\n", value);
561 lcdc_writel(sinfo, ATMEL_LCDC_TIM1, value);
562
563 /* Horizontal timing */
564 value = (info->var.right_margin - 1) << ATMEL_LCDC_HFP_OFFSET;
565 value |= (info->var.hsync_len - 1) << ATMEL_LCDC_HPW_OFFSET;
566 value |= (info->var.left_margin - 1);
567 dev_dbg(info->device, " * LCDTIM2 = %08lx\n", value);
568 lcdc_writel(sinfo, ATMEL_LCDC_TIM2, value);
569
Nicolas Ferre250a2692007-07-21 04:37:59 -0700570 /* Horizontal value (aka line size) */
571 hozval_linesz = compute_hozval(info->var.xres,
572 lcdc_readl(sinfo, ATMEL_LCDC_LCDCON2));
573
Nicolas Ferre14340582007-05-10 22:23:26 -0700574 /* Display size */
Nicolas Ferre250a2692007-07-21 04:37:59 -0700575 value = (hozval_linesz - 1) << ATMEL_LCDC_HOZVAL_OFFSET;
Nicolas Ferre14340582007-05-10 22:23:26 -0700576 value |= info->var.yres - 1;
Nicolas Ferre250a2692007-07-21 04:37:59 -0700577 dev_dbg(info->device, " * LCDFRMCFG = %08lx\n", value);
Nicolas Ferre14340582007-05-10 22:23:26 -0700578 lcdc_writel(sinfo, ATMEL_LCDC_LCDFRMCFG, value);
579
580 /* FIFO Threshold: Use formula from data sheet */
581 value = ATMEL_LCDC_FIFO_SIZE - (2 * ATMEL_LCDC_DMA_BURST_LEN + 3);
582 lcdc_writel(sinfo, ATMEL_LCDC_FIFO, value);
583
584 /* Toggle LCD_MODE every frame */
585 lcdc_writel(sinfo, ATMEL_LCDC_MVAL, 0);
586
587 /* Disable all interrupts */
588 lcdc_writel(sinfo, ATMEL_LCDC_IDR, ~0UL);
Nicolas Ferred22579b2008-07-23 21:31:20 -0700589 /* Enable FIFO & DMA errors */
590 lcdc_writel(sinfo, ATMEL_LCDC_IER, ATMEL_LCDC_UFLWI | ATMEL_LCDC_OWRI | ATMEL_LCDC_MERI);
Nicolas Ferre14340582007-05-10 22:23:26 -0700591
Nicolas Ferre14340582007-05-10 22:23:26 -0700592 /* ...wait for DMA engine to become idle... */
593 while (lcdc_readl(sinfo, ATMEL_LCDC_DMACON) & ATMEL_LCDC_DMABUSY)
594 msleep(10);
595
Haavard Skinnemoen3aa04f12008-09-13 02:33:23 -0700596 atmel_lcdfb_start(sinfo);
Nicolas Ferre14340582007-05-10 22:23:26 -0700597
598 dev_dbg(info->device, " * DONE\n");
599
600 return 0;
601}
602
603static inline unsigned int chan_to_field(unsigned int chan, const struct fb_bitfield *bf)
604{
605 chan &= 0xffff;
606 chan >>= 16 - bf->length;
607 return chan << bf->offset;
608}
609
610/**
611 * atmel_lcdfb_setcolreg - Optional function. Sets a color register.
612 * @regno: Which register in the CLUT we are programming
613 * @red: The red value which can be up to 16 bits wide
614 * @green: The green value which can be up to 16 bits wide
615 * @blue: The blue value which can be up to 16 bits wide.
616 * @transp: If supported the alpha value which can be up to 16 bits wide.
617 * @info: frame buffer info structure
618 *
619 * Set a single color register. The values supplied have a 16 bit
620 * magnitude which needs to be scaled in this function for the hardware.
621 * Things to take into consideration are how many color registers, if
622 * any, are supported with the current color visual. With truecolor mode
623 * no color palettes are supported. Here a psuedo palette is created
624 * which we store the value in pseudo_palette in struct fb_info. For
625 * pseudocolor mode we have a limited color palette. To deal with this
626 * we can program what color is displayed for a particular pixel value.
627 * DirectColor is similar in that we can program each color field. If
628 * we have a static colormap we don't need to implement this function.
629 *
630 * Returns negative errno on error, or zero on success. In an
631 * ideal world, this would have been the case, but as it turns
632 * out, the other drivers return 1 on failure, so that's what
633 * we're going to do.
634 */
635static int atmel_lcdfb_setcolreg(unsigned int regno, unsigned int red,
636 unsigned int green, unsigned int blue,
637 unsigned int transp, struct fb_info *info)
638{
639 struct atmel_lcdfb_info *sinfo = info->par;
640 unsigned int val;
641 u32 *pal;
642 int ret = 1;
643
644 if (info->var.grayscale)
645 red = green = blue = (19595 * red + 38470 * green
646 + 7471 * blue) >> 16;
647
648 switch (info->fix.visual) {
649 case FB_VISUAL_TRUECOLOR:
650 if (regno < 16) {
651 pal = info->pseudo_palette;
652
653 val = chan_to_field(red, &info->var.red);
654 val |= chan_to_field(green, &info->var.green);
655 val |= chan_to_field(blue, &info->var.blue);
656
657 pal[regno] = val;
658 ret = 0;
659 }
660 break;
661
662 case FB_VISUAL_PSEUDOCOLOR:
663 if (regno < 256) {
664 val = ((red >> 11) & 0x001f);
665 val |= ((green >> 6) & 0x03e0);
666 val |= ((blue >> 1) & 0x7c00);
667
668 /*
669 * TODO: intensity bit. Maybe something like
670 * ~(red[10] ^ green[10] ^ blue[10]) & 1
671 */
672
673 lcdc_writel(sinfo, ATMEL_LCDC_LUT(regno), val);
674 ret = 0;
675 }
676 break;
Nicolas Ferre250a2692007-07-21 04:37:59 -0700677
678 case FB_VISUAL_MONO01:
679 if (regno < 2) {
680 val = (regno == 0) ? 0x00 : 0x1F;
681 lcdc_writel(sinfo, ATMEL_LCDC_LUT(regno), val);
682 ret = 0;
683 }
684 break;
685
Nicolas Ferre14340582007-05-10 22:23:26 -0700686 }
687
688 return ret;
689}
690
691static int atmel_lcdfb_pan_display(struct fb_var_screeninfo *var,
692 struct fb_info *info)
693{
694 dev_dbg(info->device, "%s\n", __func__);
695
696 atmel_lcdfb_update_dma(info, var);
697
698 return 0;
699}
700
701static struct fb_ops atmel_lcdfb_ops = {
702 .owner = THIS_MODULE,
703 .fb_check_var = atmel_lcdfb_check_var,
704 .fb_set_par = atmel_lcdfb_set_par,
705 .fb_setcolreg = atmel_lcdfb_setcolreg,
706 .fb_pan_display = atmel_lcdfb_pan_display,
707 .fb_fillrect = cfb_fillrect,
708 .fb_copyarea = cfb_copyarea,
709 .fb_imageblit = cfb_imageblit,
710};
711
712static irqreturn_t atmel_lcdfb_interrupt(int irq, void *dev_id)
713{
714 struct fb_info *info = dev_id;
715 struct atmel_lcdfb_info *sinfo = info->par;
716 u32 status;
717
718 status = lcdc_readl(sinfo, ATMEL_LCDC_ISR);
Nicolas Ferred22579b2008-07-23 21:31:20 -0700719 if (status & ATMEL_LCDC_UFLWI) {
720 dev_warn(info->device, "FIFO underflow %#x\n", status);
721 /* reset DMA and FIFO to avoid screen shifting */
722 schedule_work(&sinfo->task);
723 }
724 lcdc_writel(sinfo, ATMEL_LCDC_ICR, status);
Nicolas Ferre14340582007-05-10 22:23:26 -0700725 return IRQ_HANDLED;
726}
727
Nicolas Ferred22579b2008-07-23 21:31:20 -0700728/*
729 * LCD controller task (to reset the LCD)
730 */
731static void atmel_lcdfb_task(struct work_struct *work)
732{
733 struct atmel_lcdfb_info *sinfo =
734 container_of(work, struct atmel_lcdfb_info, task);
735
736 atmel_lcdfb_reset(sinfo);
737}
738
Nicolas Ferre14340582007-05-10 22:23:26 -0700739static int __init atmel_lcdfb_init_fbinfo(struct atmel_lcdfb_info *sinfo)
740{
741 struct fb_info *info = sinfo->info;
742 int ret = 0;
743
Nicolas Ferre14340582007-05-10 22:23:26 -0700744 info->var.activate |= FB_ACTIVATE_FORCE | FB_ACTIVATE_NOW;
745
746 dev_info(info->device,
747 "%luKiB frame buffer at %08lx (mapped at %p)\n",
748 (unsigned long)info->fix.smem_len / 1024,
749 (unsigned long)info->fix.smem_start,
750 info->screen_base);
751
752 /* Allocate colormap */
753 ret = fb_alloc_cmap(&info->cmap, 256, 0);
754 if (ret < 0)
755 dev_err(info->device, "Alloc color map failed\n");
756
757 return ret;
758}
759
760static void atmel_lcdfb_start_clock(struct atmel_lcdfb_info *sinfo)
761{
762 if (sinfo->bus_clk)
763 clk_enable(sinfo->bus_clk);
764 clk_enable(sinfo->lcdc_clk);
765}
766
767static void atmel_lcdfb_stop_clock(struct atmel_lcdfb_info *sinfo)
768{
769 if (sinfo->bus_clk)
770 clk_disable(sinfo->bus_clk);
771 clk_disable(sinfo->lcdc_clk);
772}
773
774
775static int __init atmel_lcdfb_probe(struct platform_device *pdev)
776{
777 struct device *dev = &pdev->dev;
778 struct fb_info *info;
779 struct atmel_lcdfb_info *sinfo;
780 struct atmel_lcdfb_info *pdata_sinfo;
Nicolas Ferre968910b2008-07-23 21:31:34 -0700781 struct fb_videomode fbmode;
Nicolas Ferre14340582007-05-10 22:23:26 -0700782 struct resource *regs = NULL;
783 struct resource *map = NULL;
784 int ret;
785
786 dev_dbg(dev, "%s BEGIN\n", __func__);
787
788 ret = -ENOMEM;
789 info = framebuffer_alloc(sizeof(struct atmel_lcdfb_info), dev);
790 if (!info) {
791 dev_err(dev, "cannot allocate memory\n");
792 goto out;
793 }
794
795 sinfo = info->par;
796
797 if (dev->platform_data) {
798 pdata_sinfo = (struct atmel_lcdfb_info *)dev->platform_data;
799 sinfo->default_bpp = pdata_sinfo->default_bpp;
800 sinfo->default_dmacon = pdata_sinfo->default_dmacon;
801 sinfo->default_lcdcon2 = pdata_sinfo->default_lcdcon2;
802 sinfo->default_monspecs = pdata_sinfo->default_monspecs;
803 sinfo->atmel_lcdfb_power_control = pdata_sinfo->atmel_lcdfb_power_control;
804 sinfo->guard_time = pdata_sinfo->guard_time;
Haavard Skinnemoenea757ac2008-08-12 15:08:57 -0700805 sinfo->smem_len = pdata_sinfo->smem_len;
David Brownella9a84c32008-02-06 01:39:26 -0800806 sinfo->lcdcon_is_backlight = pdata_sinfo->lcdcon_is_backlight;
Nicolas Ferrefd085802008-04-28 02:15:21 -0700807 sinfo->lcd_wiring_mode = pdata_sinfo->lcd_wiring_mode;
Nicolas Ferre14340582007-05-10 22:23:26 -0700808 } else {
809 dev_err(dev, "cannot get default configuration\n");
810 goto free_info;
811 }
812 sinfo->info = info;
813 sinfo->pdev = pdev;
814
815 strcpy(info->fix.id, sinfo->pdev->name);
816 info->flags = ATMEL_LCDFB_FBINFO_DEFAULT;
817 info->pseudo_palette = sinfo->pseudo_palette;
818 info->fbops = &atmel_lcdfb_ops;
819
820 memcpy(&info->monspecs, sinfo->default_monspecs, sizeof(info->monspecs));
821 info->fix = atmel_lcdfb_fix;
822
823 /* Enable LCDC Clocks */
824 if (cpu_is_at91sam9261() || cpu_is_at32ap7000()) {
825 sinfo->bus_clk = clk_get(dev, "hck1");
826 if (IS_ERR(sinfo->bus_clk)) {
827 ret = PTR_ERR(sinfo->bus_clk);
828 goto free_info;
829 }
830 }
831 sinfo->lcdc_clk = clk_get(dev, "lcdc_clk");
832 if (IS_ERR(sinfo->lcdc_clk)) {
833 ret = PTR_ERR(sinfo->lcdc_clk);
834 goto put_bus_clk;
835 }
836 atmel_lcdfb_start_clock(sinfo);
837
838 ret = fb_find_mode(&info->var, info, NULL, info->monspecs.modedb,
839 info->monspecs.modedb_len, info->monspecs.modedb,
840 sinfo->default_bpp);
841 if (!ret) {
842 dev_err(dev, "no suitable video mode found\n");
843 goto stop_clk;
844 }
845
846
847 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
848 if (!regs) {
849 dev_err(dev, "resources unusable\n");
850 ret = -ENXIO;
851 goto stop_clk;
852 }
853
854 sinfo->irq_base = platform_get_irq(pdev, 0);
855 if (sinfo->irq_base < 0) {
856 dev_err(dev, "unable to get irq\n");
857 ret = sinfo->irq_base;
858 goto stop_clk;
859 }
860
861 /* Initialize video memory */
862 map = platform_get_resource(pdev, IORESOURCE_MEM, 1);
863 if (map) {
864 /* use a pre-allocated memory buffer */
865 info->fix.smem_start = map->start;
866 info->fix.smem_len = map->end - map->start + 1;
867 if (!request_mem_region(info->fix.smem_start,
868 info->fix.smem_len, pdev->name)) {
869 ret = -EBUSY;
870 goto stop_clk;
871 }
872
873 info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
874 if (!info->screen_base)
875 goto release_intmem;
Haavard Skinnemoen01d3a5e2008-04-28 02:15:19 -0700876
877 /*
878 * Don't clear the framebuffer -- someone may have set
879 * up a splash image.
880 */
Nicolas Ferre14340582007-05-10 22:23:26 -0700881 } else {
882 /* alocate memory buffer */
883 ret = atmel_lcdfb_alloc_video_memory(sinfo);
884 if (ret < 0) {
885 dev_err(dev, "cannot allocate framebuffer: %d\n", ret);
886 goto stop_clk;
887 }
888 }
889
890 /* LCDC registers */
891 info->fix.mmio_start = regs->start;
892 info->fix.mmio_len = regs->end - regs->start + 1;
893
894 if (!request_mem_region(info->fix.mmio_start,
895 info->fix.mmio_len, pdev->name)) {
896 ret = -EBUSY;
897 goto free_fb;
898 }
899
900 sinfo->mmio = ioremap(info->fix.mmio_start, info->fix.mmio_len);
901 if (!sinfo->mmio) {
902 dev_err(dev, "cannot map LCDC registers\n");
903 goto release_mem;
904 }
905
David Brownella9a84c32008-02-06 01:39:26 -0800906 /* Initialize PWM for contrast or backlight ("off") */
907 init_contrast(sinfo);
908
Nicolas Ferre14340582007-05-10 22:23:26 -0700909 /* interrupt */
910 ret = request_irq(sinfo->irq_base, atmel_lcdfb_interrupt, 0, pdev->name, info);
911 if (ret) {
912 dev_err(dev, "request_irq failed: %d\n", ret);
913 goto unmap_mmio;
914 }
915
Nicolas Ferred22579b2008-07-23 21:31:20 -0700916 /* Some operations on the LCDC might sleep and
917 * require a preemptible task context */
918 INIT_WORK(&sinfo->task, atmel_lcdfb_task);
919
Nicolas Ferre14340582007-05-10 22:23:26 -0700920 ret = atmel_lcdfb_init_fbinfo(sinfo);
921 if (ret < 0) {
922 dev_err(dev, "init fbinfo failed: %d\n", ret);
923 goto unregister_irqs;
924 }
925
926 /*
927 * This makes sure that our colour bitfield
928 * descriptors are correctly initialised.
929 */
930 atmel_lcdfb_check_var(&info->var, info);
931
932 ret = fb_set_var(info, &info->var);
933 if (ret) {
934 dev_warn(dev, "unable to set display parameters\n");
935 goto free_cmap;
936 }
937
938 dev_set_drvdata(dev, info);
939
940 /*
941 * Tell the world that we're ready to go
942 */
943 ret = register_framebuffer(info);
944 if (ret < 0) {
945 dev_err(dev, "failed to register framebuffer device: %d\n", ret);
Stanislaw Gruszka34a35bd2008-09-05 14:00:22 -0700946 goto reset_drvdata;
Nicolas Ferre14340582007-05-10 22:23:26 -0700947 }
948
Nicolas Ferre968910b2008-07-23 21:31:34 -0700949 /* add selected videomode to modelist */
950 fb_var_to_videomode(&fbmode, &info->var);
951 fb_add_videomode(&fbmode, &info->modelist);
952
Nicolas Ferre14340582007-05-10 22:23:26 -0700953 /* Power up the LCDC screen */
954 if (sinfo->atmel_lcdfb_power_control)
955 sinfo->atmel_lcdfb_power_control(1);
956
957 dev_info(dev, "fb%d: Atmel LCDC at 0x%08lx (mapped at %p), irq %lu\n",
958 info->node, info->fix.mmio_start, sinfo->mmio, sinfo->irq_base);
959
960 return 0;
961
Stanislaw Gruszka34a35bd2008-09-05 14:00:22 -0700962reset_drvdata:
963 dev_set_drvdata(dev, NULL);
Nicolas Ferre14340582007-05-10 22:23:26 -0700964free_cmap:
965 fb_dealloc_cmap(&info->cmap);
966unregister_irqs:
Nicolas Ferred22579b2008-07-23 21:31:20 -0700967 cancel_work_sync(&sinfo->task);
Nicolas Ferre14340582007-05-10 22:23:26 -0700968 free_irq(sinfo->irq_base, info);
969unmap_mmio:
David Brownella9a84c32008-02-06 01:39:26 -0800970 exit_backlight(sinfo);
Nicolas Ferre14340582007-05-10 22:23:26 -0700971 iounmap(sinfo->mmio);
972release_mem:
973 release_mem_region(info->fix.mmio_start, info->fix.mmio_len);
974free_fb:
975 if (map)
976 iounmap(info->screen_base);
977 else
978 atmel_lcdfb_free_video_memory(sinfo);
979
980release_intmem:
981 if (map)
982 release_mem_region(info->fix.smem_start, info->fix.smem_len);
983stop_clk:
984 atmel_lcdfb_stop_clock(sinfo);
985 clk_put(sinfo->lcdc_clk);
986put_bus_clk:
987 if (sinfo->bus_clk)
988 clk_put(sinfo->bus_clk);
989free_info:
990 framebuffer_release(info);
991out:
992 dev_dbg(dev, "%s FAILED\n", __func__);
993 return ret;
994}
995
996static int __exit atmel_lcdfb_remove(struct platform_device *pdev)
997{
998 struct device *dev = &pdev->dev;
999 struct fb_info *info = dev_get_drvdata(dev);
Stanislaw Gruszka34a35bd2008-09-05 14:00:22 -07001000 struct atmel_lcdfb_info *sinfo;
Nicolas Ferre14340582007-05-10 22:23:26 -07001001
Stanislaw Gruszka34a35bd2008-09-05 14:00:22 -07001002 if (!info || !info->par)
Nicolas Ferre14340582007-05-10 22:23:26 -07001003 return 0;
Stanislaw Gruszka34a35bd2008-09-05 14:00:22 -07001004 sinfo = info->par;
Nicolas Ferre14340582007-05-10 22:23:26 -07001005
Nicolas Ferred22579b2008-07-23 21:31:20 -07001006 cancel_work_sync(&sinfo->task);
David Brownella9a84c32008-02-06 01:39:26 -08001007 exit_backlight(sinfo);
Nicolas Ferre14340582007-05-10 22:23:26 -07001008 if (sinfo->atmel_lcdfb_power_control)
1009 sinfo->atmel_lcdfb_power_control(0);
1010 unregister_framebuffer(info);
1011 atmel_lcdfb_stop_clock(sinfo);
1012 clk_put(sinfo->lcdc_clk);
1013 if (sinfo->bus_clk)
1014 clk_put(sinfo->bus_clk);
1015 fb_dealloc_cmap(&info->cmap);
1016 free_irq(sinfo->irq_base, info);
1017 iounmap(sinfo->mmio);
1018 release_mem_region(info->fix.mmio_start, info->fix.mmio_len);
1019 if (platform_get_resource(pdev, IORESOURCE_MEM, 1)) {
1020 iounmap(info->screen_base);
1021 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1022 } else {
1023 atmel_lcdfb_free_video_memory(sinfo);
1024 }
1025
1026 dev_set_drvdata(dev, NULL);
1027 framebuffer_release(info);
1028
1029 return 0;
1030}
1031
David Brownellcf19a372008-04-28 02:15:20 -07001032#ifdef CONFIG_PM
1033
1034static int atmel_lcdfb_suspend(struct platform_device *pdev, pm_message_t mesg)
1035{
1036 struct fb_info *info = platform_get_drvdata(pdev);
1037 struct atmel_lcdfb_info *sinfo = info->par;
1038
Haavard Skinnemoen3aa04f12008-09-13 02:33:23 -07001039 /*
1040 * We don't want to handle interrupts while the clock is
1041 * stopped. It may take forever.
1042 */
1043 lcdc_writel(sinfo, ATMEL_LCDC_IDR, ~0UL);
1044
David Brownellcf19a372008-04-28 02:15:20 -07001045 sinfo->saved_lcdcon = lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
1046 lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, 0);
1047 if (sinfo->atmel_lcdfb_power_control)
1048 sinfo->atmel_lcdfb_power_control(0);
Haavard Skinnemoen3aa04f12008-09-13 02:33:23 -07001049
1050 atmel_lcdfb_stop(sinfo);
David Brownellcf19a372008-04-28 02:15:20 -07001051 atmel_lcdfb_stop_clock(sinfo);
Haavard Skinnemoen3aa04f12008-09-13 02:33:23 -07001052
David Brownellcf19a372008-04-28 02:15:20 -07001053 return 0;
1054}
1055
1056static int atmel_lcdfb_resume(struct platform_device *pdev)
1057{
1058 struct fb_info *info = platform_get_drvdata(pdev);
1059 struct atmel_lcdfb_info *sinfo = info->par;
1060
1061 atmel_lcdfb_start_clock(sinfo);
Haavard Skinnemoen3aa04f12008-09-13 02:33:23 -07001062 atmel_lcdfb_start(sinfo);
David Brownellcf19a372008-04-28 02:15:20 -07001063 if (sinfo->atmel_lcdfb_power_control)
1064 sinfo->atmel_lcdfb_power_control(1);
1065 lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, sinfo->saved_lcdcon);
Haavard Skinnemoen3aa04f12008-09-13 02:33:23 -07001066
1067 /* Enable FIFO & DMA errors */
1068 lcdc_writel(sinfo, ATMEL_LCDC_IER, ATMEL_LCDC_UFLWI
1069 | ATMEL_LCDC_OWRI | ATMEL_LCDC_MERI);
1070
David Brownellcf19a372008-04-28 02:15:20 -07001071 return 0;
1072}
1073
1074#else
1075#define atmel_lcdfb_suspend NULL
1076#define atmel_lcdfb_resume NULL
1077#endif
1078
Nicolas Ferre14340582007-05-10 22:23:26 -07001079static struct platform_driver atmel_lcdfb_driver = {
1080 .remove = __exit_p(atmel_lcdfb_remove),
David Brownellcf19a372008-04-28 02:15:20 -07001081 .suspend = atmel_lcdfb_suspend,
1082 .resume = atmel_lcdfb_resume,
David Brownella9a84c32008-02-06 01:39:26 -08001083
Nicolas Ferre14340582007-05-10 22:23:26 -07001084 .driver = {
1085 .name = "atmel_lcdfb",
1086 .owner = THIS_MODULE,
1087 },
1088};
1089
1090static int __init atmel_lcdfb_init(void)
1091{
1092 return platform_driver_probe(&atmel_lcdfb_driver, atmel_lcdfb_probe);
1093}
1094
1095static void __exit atmel_lcdfb_exit(void)
1096{
1097 platform_driver_unregister(&atmel_lcdfb_driver);
1098}
1099
1100module_init(atmel_lcdfb_init);
1101module_exit(atmel_lcdfb_exit);
1102
1103MODULE_DESCRIPTION("AT91/AT32 LCD Controller framebuffer driver");
Nicolas Ferre8f4c79c2008-01-14 00:55:13 -08001104MODULE_AUTHOR("Nicolas Ferre <nicolas.ferre@atmel.com>");
Nicolas Ferre14340582007-05-10 22:23:26 -07001105MODULE_LICENSE("GPL");