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Diffstat (limited to 'drivers/video/atmel_lcdfb.c')
-rw-r--r--drivers/video/atmel_lcdfb.c752
1 files changed, 752 insertions, 0 deletions
diff --git a/drivers/video/atmel_lcdfb.c b/drivers/video/atmel_lcdfb.c
new file mode 100644
index 000000000000..e1d5bd0c98c4
--- /dev/null
+++ b/drivers/video/atmel_lcdfb.c
@@ -0,0 +1,752 @@
1/*
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>
19
20#include <asm/arch/board.h>
21#include <asm/arch/cpu.h>
22#include <asm/arch/gpio.h>
23
24#include <video/atmel_lcdc.h>
25
26#define lcdc_readl(sinfo, reg) __raw_readl((sinfo)->mmio+(reg))
27#define lcdc_writel(sinfo, reg, val) __raw_writel((val), (sinfo)->mmio+(reg))
28
29/* configurable parameters */
30#define ATMEL_LCDC_CVAL_DEFAULT 0xc8
31#define ATMEL_LCDC_DMA_BURST_LEN 8
32
33#if defined(CONFIG_ARCH_AT91SAM9263)
34#define ATMEL_LCDC_FIFO_SIZE 2048
35#else
36#define ATMEL_LCDC_FIFO_SIZE 512
37#endif
38
39#if defined(CONFIG_ARCH_AT91)
40#define ATMEL_LCDFB_FBINFO_DEFAULT FBINFO_DEFAULT
41
42static inline void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info *sinfo,
43 struct fb_var_screeninfo *var)
44{
45
46}
47#elif defined(CONFIG_AVR32)
48#define ATMEL_LCDFB_FBINFO_DEFAULT (FBINFO_DEFAULT \
49 | FBINFO_PARTIAL_PAN_OK \
50 | FBINFO_HWACCEL_XPAN \
51 | FBINFO_HWACCEL_YPAN)
52
53static void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info *sinfo,
54 struct fb_var_screeninfo *var)
55{
56 u32 dma2dcfg;
57 u32 pixeloff;
58
59 pixeloff = (var->xoffset * var->bits_per_pixel) & 0x1f;
60
61 dma2dcfg = ((var->xres_virtual - var->xres) * var->bits_per_pixel) / 8;
62 dma2dcfg |= pixeloff << ATMEL_LCDC_PIXELOFF_OFFSET;
63 lcdc_writel(sinfo, ATMEL_LCDC_DMA2DCFG, dma2dcfg);
64
65 /* Update configuration */
66 lcdc_writel(sinfo, ATMEL_LCDC_DMACON,
67 lcdc_readl(sinfo, ATMEL_LCDC_DMACON)
68 | ATMEL_LCDC_DMAUPDT);
69}
70#endif
71
72
73static struct fb_fix_screeninfo atmel_lcdfb_fix __initdata = {
74 .type = FB_TYPE_PACKED_PIXELS,
75 .visual = FB_VISUAL_TRUECOLOR,
76 .xpanstep = 0,
77 .ypanstep = 0,
78 .ywrapstep = 0,
79 .accel = FB_ACCEL_NONE,
80};
81
82
83static void atmel_lcdfb_update_dma(struct fb_info *info,
84 struct fb_var_screeninfo *var)
85{
86 struct atmel_lcdfb_info *sinfo = info->par;
87 struct fb_fix_screeninfo *fix = &info->fix;
88 unsigned long dma_addr;
89
90 dma_addr = (fix->smem_start + var->yoffset * fix->line_length
91 + var->xoffset * var->bits_per_pixel / 8);
92
93 dma_addr &= ~3UL;
94
95 /* Set framebuffer DMA base address and pixel offset */
96 lcdc_writel(sinfo, ATMEL_LCDC_DMABADDR1, dma_addr);
97
98 atmel_lcdfb_update_dma2d(sinfo, var);
99}
100
101static inline void atmel_lcdfb_free_video_memory(struct atmel_lcdfb_info *sinfo)
102{
103 struct fb_info *info = sinfo->info;
104
105 dma_free_writecombine(info->device, info->fix.smem_len,
106 info->screen_base, info->fix.smem_start);
107}
108
109/**
110 * atmel_lcdfb_alloc_video_memory - Allocate framebuffer memory
111 * @sinfo: the frame buffer to allocate memory for
112 */
113static int atmel_lcdfb_alloc_video_memory(struct atmel_lcdfb_info *sinfo)
114{
115 struct fb_info *info = sinfo->info;
116 struct fb_var_screeninfo *var = &info->var;
117
118 info->fix.smem_len = (var->xres_virtual * var->yres_virtual
119 * ((var->bits_per_pixel + 7) / 8));
120
121 info->screen_base = dma_alloc_writecombine(info->device, info->fix.smem_len,
122 (dma_addr_t *)&info->fix.smem_start, GFP_KERNEL);
123
124 if (!info->screen_base) {
125 return -ENOMEM;
126 }
127
128 return 0;
129}
130
131/**
132 * atmel_lcdfb_check_var - Validates a var passed in.
133 * @var: frame buffer variable screen structure
134 * @info: frame buffer structure that represents a single frame buffer
135 *
136 * Checks to see if the hardware supports the state requested by
137 * var passed in. This function does not alter the hardware
138 * state!!! This means the data stored in struct fb_info and
139 * struct atmel_lcdfb_info do not change. This includes the var
140 * inside of struct fb_info. Do NOT change these. This function
141 * can be called on its own if we intent to only test a mode and
142 * not actually set it. The stuff in modedb.c is a example of
143 * this. If the var passed in is slightly off by what the
144 * hardware can support then we alter the var PASSED in to what
145 * we can do. If the hardware doesn't support mode change a
146 * -EINVAL will be returned by the upper layers. You don't need
147 * to implement this function then. If you hardware doesn't
148 * support changing the resolution then this function is not
149 * needed. In this case the driver would just provide a var that
150 * represents the static state the screen is in.
151 *
152 * Returns negative errno on error, or zero on success.
153 */
154static int atmel_lcdfb_check_var(struct fb_var_screeninfo *var,
155 struct fb_info *info)
156{
157 struct device *dev = info->device;
158 struct atmel_lcdfb_info *sinfo = info->par;
159 unsigned long clk_value_khz;
160
161 clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000;
162
163 dev_dbg(dev, "%s:\n", __func__);
164 dev_dbg(dev, " resolution: %ux%u\n", var->xres, var->yres);
165 dev_dbg(dev, " pixclk: %lu KHz\n", PICOS2KHZ(var->pixclock));
166 dev_dbg(dev, " bpp: %u\n", var->bits_per_pixel);
167 dev_dbg(dev, " clk: %lu KHz\n", clk_value_khz);
168
169 if ((PICOS2KHZ(var->pixclock) * var->bits_per_pixel / 8) > clk_value_khz) {
170 dev_err(dev, "%lu KHz pixel clock is too fast\n", PICOS2KHZ(var->pixclock));
171 return -EINVAL;
172 }
173
174 /* Force same alignment for each line */
175 var->xres = (var->xres + 3) & ~3UL;
176 var->xres_virtual = (var->xres_virtual + 3) & ~3UL;
177
178 var->red.msb_right = var->green.msb_right = var->blue.msb_right = 0;
179 var->transp.msb_right = 0;
180 var->transp.offset = var->transp.length = 0;
181 var->xoffset = var->yoffset = 0;
182
183 switch (var->bits_per_pixel) {
184 case 2:
185 case 4:
186 case 8:
187 var->red.offset = var->green.offset = var->blue.offset = 0;
188 var->red.length = var->green.length = var->blue.length
189 = var->bits_per_pixel;
190 break;
191 case 15:
192 case 16:
193 var->red.offset = 0;
194 var->green.offset = 5;
195 var->blue.offset = 10;
196 var->red.length = var->green.length = var->blue.length = 5;
197 break;
198 case 24:
199 case 32:
200 var->red.offset = 0;
201 var->green.offset = 8;
202 var->blue.offset = 16;
203 var->red.length = var->green.length = var->blue.length = 8;
204 break;
205 default:
206 dev_err(dev, "color depth %d not supported\n",
207 var->bits_per_pixel);
208 return -EINVAL;
209 }
210
211 return 0;
212}
213
214/**
215 * atmel_lcdfb_set_par - Alters the hardware state.
216 * @info: frame buffer structure that represents a single frame buffer
217 *
218 * Using the fb_var_screeninfo in fb_info we set the resolution
219 * of the this particular framebuffer. This function alters the
220 * par AND the fb_fix_screeninfo stored in fb_info. It doesn't
221 * not alter var in fb_info since we are using that data. This
222 * means we depend on the data in var inside fb_info to be
223 * supported by the hardware. atmel_lcdfb_check_var is always called
224 * before atmel_lcdfb_set_par to ensure this. Again if you can't
225 * change the resolution you don't need this function.
226 *
227 */
228static int atmel_lcdfb_set_par(struct fb_info *info)
229{
230 struct atmel_lcdfb_info *sinfo = info->par;
231 unsigned long value;
232 unsigned long clk_value_khz;
233
234 dev_dbg(info->device, "%s:\n", __func__);
235 dev_dbg(info->device, " * resolution: %ux%u (%ux%u virtual)\n",
236 info->var.xres, info->var.yres,
237 info->var.xres_virtual, info->var.yres_virtual);
238
239 /* Turn off the LCD controller and the DMA controller */
240 lcdc_writel(sinfo, ATMEL_LCDC_PWRCON, sinfo->guard_time << ATMEL_LCDC_GUARDT_OFFSET);
241
242 lcdc_writel(sinfo, ATMEL_LCDC_DMACON, 0);
243
244 if (info->var.bits_per_pixel <= 8)
245 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
246 else
247 info->fix.visual = FB_VISUAL_TRUECOLOR;
248
249 info->fix.line_length = info->var.xres_virtual * (info->var.bits_per_pixel / 8);
250
251 /* Re-initialize the DMA engine... */
252 dev_dbg(info->device, " * update DMA engine\n");
253 atmel_lcdfb_update_dma(info, &info->var);
254
255 /* ...set frame size and burst length = 8 words (?) */
256 value = (info->var.yres * info->var.xres * info->var.bits_per_pixel) / 32;
257 value |= ((ATMEL_LCDC_DMA_BURST_LEN - 1) << ATMEL_LCDC_BLENGTH_OFFSET);
258 lcdc_writel(sinfo, ATMEL_LCDC_DMAFRMCFG, value);
259
260 /* Now, the LCDC core... */
261
262 /* Set pixel clock */
263 clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000;
264
265 value = clk_value_khz / PICOS2KHZ(info->var.pixclock);
266
267 if (clk_value_khz % PICOS2KHZ(info->var.pixclock))
268 value++;
269
270 value = (value / 2) - 1;
271
272 if (value <= 0) {
273 dev_notice(info->device, "Bypassing pixel clock divider\n");
274 lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1, ATMEL_LCDC_BYPASS);
275 } else
276 lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1, value << ATMEL_LCDC_CLKVAL_OFFSET);
277
278 /* Initialize control register 2 */
279 value = sinfo->default_lcdcon2;
280
281 if (!(info->var.sync & FB_SYNC_HOR_HIGH_ACT))
282 value |= ATMEL_LCDC_INVLINE_INVERTED;
283 if (!(info->var.sync & FB_SYNC_VERT_HIGH_ACT))
284 value |= ATMEL_LCDC_INVFRAME_INVERTED;
285
286 switch (info->var.bits_per_pixel) {
287 case 1: value |= ATMEL_LCDC_PIXELSIZE_1; break;
288 case 2: value |= ATMEL_LCDC_PIXELSIZE_2; break;
289 case 4: value |= ATMEL_LCDC_PIXELSIZE_4; break;
290 case 8: value |= ATMEL_LCDC_PIXELSIZE_8; break;
291 case 15: /* fall through */
292 case 16: value |= ATMEL_LCDC_PIXELSIZE_16; break;
293 case 24: value |= ATMEL_LCDC_PIXELSIZE_24; break;
294 case 32: value |= ATMEL_LCDC_PIXELSIZE_32; break;
295 default: BUG(); break;
296 }
297 dev_dbg(info->device, " * LCDCON2 = %08lx\n", value);
298 lcdc_writel(sinfo, ATMEL_LCDC_LCDCON2, value);
299
300 /* Vertical timing */
301 value = (info->var.vsync_len - 1) << ATMEL_LCDC_VPW_OFFSET;
302 value |= info->var.upper_margin << ATMEL_LCDC_VBP_OFFSET;
303 value |= info->var.lower_margin;
304 dev_dbg(info->device, " * LCDTIM1 = %08lx\n", value);
305 lcdc_writel(sinfo, ATMEL_LCDC_TIM1, value);
306
307 /* Horizontal timing */
308 value = (info->var.right_margin - 1) << ATMEL_LCDC_HFP_OFFSET;
309 value |= (info->var.hsync_len - 1) << ATMEL_LCDC_HPW_OFFSET;
310 value |= (info->var.left_margin - 1);
311 dev_dbg(info->device, " * LCDTIM2 = %08lx\n", value);
312 lcdc_writel(sinfo, ATMEL_LCDC_TIM2, value);
313
314 /* Display size */
315 value = (info->var.xres - 1) << ATMEL_LCDC_HOZVAL_OFFSET;
316 value |= info->var.yres - 1;
317 lcdc_writel(sinfo, ATMEL_LCDC_LCDFRMCFG, value);
318
319 /* FIFO Threshold: Use formula from data sheet */
320 value = ATMEL_LCDC_FIFO_SIZE - (2 * ATMEL_LCDC_DMA_BURST_LEN + 3);
321 lcdc_writel(sinfo, ATMEL_LCDC_FIFO, value);
322
323 /* Toggle LCD_MODE every frame */
324 lcdc_writel(sinfo, ATMEL_LCDC_MVAL, 0);
325
326 /* Disable all interrupts */
327 lcdc_writel(sinfo, ATMEL_LCDC_IDR, ~0UL);
328
329 /* Set contrast */
330 value = ATMEL_LCDC_PS_DIV8 | ATMEL_LCDC_POL_POSITIVE | ATMEL_LCDC_ENA_PWMENABLE;
331 lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, value);
332 lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_VAL, ATMEL_LCDC_CVAL_DEFAULT);
333 /* ...wait for DMA engine to become idle... */
334 while (lcdc_readl(sinfo, ATMEL_LCDC_DMACON) & ATMEL_LCDC_DMABUSY)
335 msleep(10);
336
337 dev_dbg(info->device, " * re-enable DMA engine\n");
338 /* ...and enable it with updated configuration */
339 lcdc_writel(sinfo, ATMEL_LCDC_DMACON, sinfo->default_dmacon);
340
341 dev_dbg(info->device, " * re-enable LCDC core\n");
342 lcdc_writel(sinfo, ATMEL_LCDC_PWRCON,
343 (sinfo->guard_time << ATMEL_LCDC_GUARDT_OFFSET) | ATMEL_LCDC_PWR);
344
345 dev_dbg(info->device, " * DONE\n");
346
347 return 0;
348}
349
350static inline unsigned int chan_to_field(unsigned int chan, const struct fb_bitfield *bf)
351{
352 chan &= 0xffff;
353 chan >>= 16 - bf->length;
354 return chan << bf->offset;
355}
356
357/**
358 * atmel_lcdfb_setcolreg - Optional function. Sets a color register.
359 * @regno: Which register in the CLUT we are programming
360 * @red: The red value which can be up to 16 bits wide
361 * @green: The green value which can be up to 16 bits wide
362 * @blue: The blue value which can be up to 16 bits wide.
363 * @transp: If supported the alpha value which can be up to 16 bits wide.
364 * @info: frame buffer info structure
365 *
366 * Set a single color register. The values supplied have a 16 bit
367 * magnitude which needs to be scaled in this function for the hardware.
368 * Things to take into consideration are how many color registers, if
369 * any, are supported with the current color visual. With truecolor mode
370 * no color palettes are supported. Here a psuedo palette is created
371 * which we store the value in pseudo_palette in struct fb_info. For
372 * pseudocolor mode we have a limited color palette. To deal with this
373 * we can program what color is displayed for a particular pixel value.
374 * DirectColor is similar in that we can program each color field. If
375 * we have a static colormap we don't need to implement this function.
376 *
377 * Returns negative errno on error, or zero on success. In an
378 * ideal world, this would have been the case, but as it turns
379 * out, the other drivers return 1 on failure, so that's what
380 * we're going to do.
381 */
382static int atmel_lcdfb_setcolreg(unsigned int regno, unsigned int red,
383 unsigned int green, unsigned int blue,
384 unsigned int transp, struct fb_info *info)
385{
386 struct atmel_lcdfb_info *sinfo = info->par;
387 unsigned int val;
388 u32 *pal;
389 int ret = 1;
390
391 if (info->var.grayscale)
392 red = green = blue = (19595 * red + 38470 * green
393 + 7471 * blue) >> 16;
394
395 switch (info->fix.visual) {
396 case FB_VISUAL_TRUECOLOR:
397 if (regno < 16) {
398 pal = info->pseudo_palette;
399
400 val = chan_to_field(red, &info->var.red);
401 val |= chan_to_field(green, &info->var.green);
402 val |= chan_to_field(blue, &info->var.blue);
403
404 pal[regno] = val;
405 ret = 0;
406 }
407 break;
408
409 case FB_VISUAL_PSEUDOCOLOR:
410 if (regno < 256) {
411 val = ((red >> 11) & 0x001f);
412 val |= ((green >> 6) & 0x03e0);
413 val |= ((blue >> 1) & 0x7c00);
414
415 /*
416 * TODO: intensity bit. Maybe something like
417 * ~(red[10] ^ green[10] ^ blue[10]) & 1
418 */
419
420 lcdc_writel(sinfo, ATMEL_LCDC_LUT(regno), val);
421 ret = 0;
422 }
423 break;
424 }
425
426 return ret;
427}
428
429static int atmel_lcdfb_pan_display(struct fb_var_screeninfo *var,
430 struct fb_info *info)
431{
432 dev_dbg(info->device, "%s\n", __func__);
433
434 atmel_lcdfb_update_dma(info, var);
435
436 return 0;
437}
438
439static struct fb_ops atmel_lcdfb_ops = {
440 .owner = THIS_MODULE,
441 .fb_check_var = atmel_lcdfb_check_var,
442 .fb_set_par = atmel_lcdfb_set_par,
443 .fb_setcolreg = atmel_lcdfb_setcolreg,
444 .fb_pan_display = atmel_lcdfb_pan_display,
445 .fb_fillrect = cfb_fillrect,
446 .fb_copyarea = cfb_copyarea,
447 .fb_imageblit = cfb_imageblit,
448};
449
450static irqreturn_t atmel_lcdfb_interrupt(int irq, void *dev_id)
451{
452 struct fb_info *info = dev_id;
453 struct atmel_lcdfb_info *sinfo = info->par;
454 u32 status;
455
456 status = lcdc_readl(sinfo, ATMEL_LCDC_ISR);
457 lcdc_writel(sinfo, ATMEL_LCDC_IDR, status);
458 return IRQ_HANDLED;
459}
460
461static int __init atmel_lcdfb_init_fbinfo(struct atmel_lcdfb_info *sinfo)
462{
463 struct fb_info *info = sinfo->info;
464 int ret = 0;
465
466 memset_io(info->screen_base, 0, info->fix.smem_len);
467 info->var.activate |= FB_ACTIVATE_FORCE | FB_ACTIVATE_NOW;
468
469 dev_info(info->device,
470 "%luKiB frame buffer at %08lx (mapped at %p)\n",
471 (unsigned long)info->fix.smem_len / 1024,
472 (unsigned long)info->fix.smem_start,
473 info->screen_base);
474
475 /* Allocate colormap */
476 ret = fb_alloc_cmap(&info->cmap, 256, 0);
477 if (ret < 0)
478 dev_err(info->device, "Alloc color map failed\n");
479
480 return ret;
481}
482
483static void atmel_lcdfb_start_clock(struct atmel_lcdfb_info *sinfo)
484{
485 if (sinfo->bus_clk)
486 clk_enable(sinfo->bus_clk);
487 clk_enable(sinfo->lcdc_clk);
488}
489
490static void atmel_lcdfb_stop_clock(struct atmel_lcdfb_info *sinfo)
491{
492 if (sinfo->bus_clk)
493 clk_disable(sinfo->bus_clk);
494 clk_disable(sinfo->lcdc_clk);
495}
496
497
498static int __init atmel_lcdfb_probe(struct platform_device *pdev)
499{
500 struct device *dev = &pdev->dev;
501 struct fb_info *info;
502 struct atmel_lcdfb_info *sinfo;
503 struct atmel_lcdfb_info *pdata_sinfo;
504 struct resource *regs = NULL;
505 struct resource *map = NULL;
506 int ret;
507
508 dev_dbg(dev, "%s BEGIN\n", __func__);
509
510 ret = -ENOMEM;
511 info = framebuffer_alloc(sizeof(struct atmel_lcdfb_info), dev);
512 if (!info) {
513 dev_err(dev, "cannot allocate memory\n");
514 goto out;
515 }
516
517 sinfo = info->par;
518
519 if (dev->platform_data) {
520 pdata_sinfo = (struct atmel_lcdfb_info *)dev->platform_data;
521 sinfo->default_bpp = pdata_sinfo->default_bpp;
522 sinfo->default_dmacon = pdata_sinfo->default_dmacon;
523 sinfo->default_lcdcon2 = pdata_sinfo->default_lcdcon2;
524 sinfo->default_monspecs = pdata_sinfo->default_monspecs;
525 sinfo->atmel_lcdfb_power_control = pdata_sinfo->atmel_lcdfb_power_control;
526 sinfo->guard_time = pdata_sinfo->guard_time;
527 } else {
528 dev_err(dev, "cannot get default configuration\n");
529 goto free_info;
530 }
531 sinfo->info = info;
532 sinfo->pdev = pdev;
533
534 strcpy(info->fix.id, sinfo->pdev->name);
535 info->flags = ATMEL_LCDFB_FBINFO_DEFAULT;
536 info->pseudo_palette = sinfo->pseudo_palette;
537 info->fbops = &atmel_lcdfb_ops;
538
539 memcpy(&info->monspecs, sinfo->default_monspecs, sizeof(info->monspecs));
540 info->fix = atmel_lcdfb_fix;
541
542 /* Enable LCDC Clocks */
543 if (cpu_is_at91sam9261() || cpu_is_at32ap7000()) {
544 sinfo->bus_clk = clk_get(dev, "hck1");
545 if (IS_ERR(sinfo->bus_clk)) {
546 ret = PTR_ERR(sinfo->bus_clk);
547 goto free_info;
548 }
549 }
550 sinfo->lcdc_clk = clk_get(dev, "lcdc_clk");
551 if (IS_ERR(sinfo->lcdc_clk)) {
552 ret = PTR_ERR(sinfo->lcdc_clk);
553 goto put_bus_clk;
554 }
555 atmel_lcdfb_start_clock(sinfo);
556
557 ret = fb_find_mode(&info->var, info, NULL, info->monspecs.modedb,
558 info->monspecs.modedb_len, info->monspecs.modedb,
559 sinfo->default_bpp);
560 if (!ret) {
561 dev_err(dev, "no suitable video mode found\n");
562 goto stop_clk;
563 }
564
565
566 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
567 if (!regs) {
568 dev_err(dev, "resources unusable\n");
569 ret = -ENXIO;
570 goto stop_clk;
571 }
572
573 sinfo->irq_base = platform_get_irq(pdev, 0);
574 if (sinfo->irq_base < 0) {
575 dev_err(dev, "unable to get irq\n");
576 ret = sinfo->irq_base;
577 goto stop_clk;
578 }
579
580 /* Initialize video memory */
581 map = platform_get_resource(pdev, IORESOURCE_MEM, 1);
582 if (map) {
583 /* use a pre-allocated memory buffer */
584 info->fix.smem_start = map->start;
585 info->fix.smem_len = map->end - map->start + 1;
586 if (!request_mem_region(info->fix.smem_start,
587 info->fix.smem_len, pdev->name)) {
588 ret = -EBUSY;
589 goto stop_clk;
590 }
591
592 info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
593 if (!info->screen_base)
594 goto release_intmem;
595 } else {
596 /* alocate memory buffer */
597 ret = atmel_lcdfb_alloc_video_memory(sinfo);
598 if (ret < 0) {
599 dev_err(dev, "cannot allocate framebuffer: %d\n", ret);
600 goto stop_clk;
601 }
602 }
603
604 /* LCDC registers */
605 info->fix.mmio_start = regs->start;
606 info->fix.mmio_len = regs->end - regs->start + 1;
607
608 if (!request_mem_region(info->fix.mmio_start,
609 info->fix.mmio_len, pdev->name)) {
610 ret = -EBUSY;
611 goto free_fb;
612 }
613
614 sinfo->mmio = ioremap(info->fix.mmio_start, info->fix.mmio_len);
615 if (!sinfo->mmio) {
616 dev_err(dev, "cannot map LCDC registers\n");
617 goto release_mem;
618 }
619
620 /* interrupt */
621 ret = request_irq(sinfo->irq_base, atmel_lcdfb_interrupt, 0, pdev->name, info);
622 if (ret) {
623 dev_err(dev, "request_irq failed: %d\n", ret);
624 goto unmap_mmio;
625 }
626
627 ret = atmel_lcdfb_init_fbinfo(sinfo);
628 if (ret < 0) {
629 dev_err(dev, "init fbinfo failed: %d\n", ret);
630 goto unregister_irqs;
631 }
632
633 /*
634 * This makes sure that our colour bitfield
635 * descriptors are correctly initialised.
636 */
637 atmel_lcdfb_check_var(&info->var, info);
638
639 ret = fb_set_var(info, &info->var);
640 if (ret) {
641 dev_warn(dev, "unable to set display parameters\n");
642 goto free_cmap;
643 }
644
645 dev_set_drvdata(dev, info);
646
647 /*
648 * Tell the world that we're ready to go
649 */
650 ret = register_framebuffer(info);
651 if (ret < 0) {
652 dev_err(dev, "failed to register framebuffer device: %d\n", ret);
653 goto free_cmap;
654 }
655
656 /* Power up the LCDC screen */
657 if (sinfo->atmel_lcdfb_power_control)
658 sinfo->atmel_lcdfb_power_control(1);
659
660 dev_info(dev, "fb%d: Atmel LCDC at 0x%08lx (mapped at %p), irq %lu\n",
661 info->node, info->fix.mmio_start, sinfo->mmio, sinfo->irq_base);
662
663 return 0;
664
665
666free_cmap:
667 fb_dealloc_cmap(&info->cmap);
668unregister_irqs:
669 free_irq(sinfo->irq_base, info);
670unmap_mmio:
671 iounmap(sinfo->mmio);
672release_mem:
673 release_mem_region(info->fix.mmio_start, info->fix.mmio_len);
674free_fb:
675 if (map)
676 iounmap(info->screen_base);
677 else
678 atmel_lcdfb_free_video_memory(sinfo);
679
680release_intmem:
681 if (map)
682 release_mem_region(info->fix.smem_start, info->fix.smem_len);
683stop_clk:
684 atmel_lcdfb_stop_clock(sinfo);
685 clk_put(sinfo->lcdc_clk);
686put_bus_clk:
687 if (sinfo->bus_clk)
688 clk_put(sinfo->bus_clk);
689free_info:
690 framebuffer_release(info);
691out:
692 dev_dbg(dev, "%s FAILED\n", __func__);
693 return ret;
694}
695
696static int __exit atmel_lcdfb_remove(struct platform_device *pdev)
697{
698 struct device *dev = &pdev->dev;
699 struct fb_info *info = dev_get_drvdata(dev);
700 struct atmel_lcdfb_info *sinfo = info->par;
701
702 if (!sinfo)
703 return 0;
704
705 if (sinfo->atmel_lcdfb_power_control)
706 sinfo->atmel_lcdfb_power_control(0);
707 unregister_framebuffer(info);
708 atmel_lcdfb_stop_clock(sinfo);
709 clk_put(sinfo->lcdc_clk);
710 if (sinfo->bus_clk)
711 clk_put(sinfo->bus_clk);
712 fb_dealloc_cmap(&info->cmap);
713 free_irq(sinfo->irq_base, info);
714 iounmap(sinfo->mmio);
715 release_mem_region(info->fix.mmio_start, info->fix.mmio_len);
716 if (platform_get_resource(pdev, IORESOURCE_MEM, 1)) {
717 iounmap(info->screen_base);
718 release_mem_region(info->fix.smem_start, info->fix.smem_len);
719 } else {
720 atmel_lcdfb_free_video_memory(sinfo);
721 }
722
723 dev_set_drvdata(dev, NULL);
724 framebuffer_release(info);
725
726 return 0;
727}
728
729static struct platform_driver atmel_lcdfb_driver = {
730 .remove = __exit_p(atmel_lcdfb_remove),
731 .driver = {
732 .name = "atmel_lcdfb",
733 .owner = THIS_MODULE,
734 },
735};
736
737static int __init atmel_lcdfb_init(void)
738{
739 return platform_driver_probe(&atmel_lcdfb_driver, atmel_lcdfb_probe);
740}
741
742static void __exit atmel_lcdfb_exit(void)
743{
744 platform_driver_unregister(&atmel_lcdfb_driver);
745}
746
747module_init(atmel_lcdfb_init);
748module_exit(atmel_lcdfb_exit);
749
750MODULE_DESCRIPTION("AT91/AT32 LCD Controller framebuffer driver");
751MODULE_AUTHOR("Nicolas Ferre <nicolas.ferre@rfo.atmel.com>");
752MODULE_LICENSE("GPL");
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-26 07:59:08 -0500