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Sascha Hauer7c2f891c2005-05-01 08:59:24 -07001/*
Sascha Hauer7c2f891c2005-05-01 08:59:24 -07002 * Freescale i.MX Frame Buffer device driver
3 *
4 * Copyright (C) 2004 Sascha Hauer, Pengutronix
5 * Based on acornfb.c Copyright (C) Russell King.
6 *
7 * This file is subject to the terms and conditions of the GNU General Public
8 * License. See the file COPYING in the main directory of this archive for
9 * more details.
10 *
11 * Please direct your questions and comments on this driver to the following
12 * email address:
13 *
14 * linux-arm-kernel@lists.arm.linux.org.uk
15 */
16
Sascha Hauer7c2f891c2005-05-01 08:59:24 -070017#include <linux/module.h>
18#include <linux/kernel.h>
Sascha Hauer7c2f891c2005-05-01 08:59:24 -070019#include <linux/errno.h>
20#include <linux/string.h>
21#include <linux/interrupt.h>
22#include <linux/slab.h>
Andrea Righi27ac7922008-07-23 21:28:13 -070023#include <linux/mm.h>
Sascha Hauer7c2f891c2005-05-01 08:59:24 -070024#include <linux/fb.h>
25#include <linux/delay.h>
26#include <linux/init.h>
27#include <linux/ioport.h>
28#include <linux/cpufreq.h>
Sascha Hauerf909ef62009-01-15 15:21:00 +010029#include <linux/clk.h>
Russell Kingd052d1b2005-10-29 19:07:23 +010030#include <linux/platform_device.h>
Sascha Hauer7c2f891c2005-05-01 08:59:24 -070031#include <linux/dma-mapping.h>
Juergen Beisert72330b02008-12-16 11:44:07 +010032#include <linux/io.h>
Sascha Hauerf909ef62009-01-15 15:21:00 +010033#include <linux/math64.h>
Sascha Hauer7c2f891c2005-05-01 08:59:24 -070034
Russell Kinga09e64f2008-08-05 16:14:15 +010035#include <mach/imxfb.h>
Sascha Hauerf497d012009-03-18 11:29:31 +010036#include <mach/hardware.h>
Sascha Hauer7c2f891c2005-05-01 08:59:24 -070037
38/*
39 * Complain if VAR is out of range.
40 */
41#define DEBUG_VAR 1
42
Juergen Beisert72330b02008-12-16 11:44:07 +010043#define DRIVER_NAME "imx-fb"
44
45#define LCDC_SSA 0x00
46
47#define LCDC_SIZE 0x04
48#define SIZE_XMAX(x) ((((x) >> 4) & 0x3f) << 20)
Sascha Hauer1d0f9872009-01-26 17:29:10 +010049
50#ifdef CONFIG_ARCH_MX1
Juergen Beisert72330b02008-12-16 11:44:07 +010051#define SIZE_YMAX(y) ((y) & 0x1ff)
Sascha Hauer1d0f9872009-01-26 17:29:10 +010052#else
53#define SIZE_YMAX(y) ((y) & 0x3ff)
54#endif
Juergen Beisert72330b02008-12-16 11:44:07 +010055
56#define LCDC_VPW 0x08
57#define VPW_VPW(x) ((x) & 0x3ff)
58
59#define LCDC_CPOS 0x0C
60#define CPOS_CC1 (1<<31)
61#define CPOS_CC0 (1<<30)
62#define CPOS_OP (1<<28)
63#define CPOS_CXP(x) (((x) & 3ff) << 16)
Sascha Hauer1d0f9872009-01-26 17:29:10 +010064
65#ifdef CONFIG_ARCH_MX1
Juergen Beisert72330b02008-12-16 11:44:07 +010066#define CPOS_CYP(y) ((y) & 0x1ff)
Sascha Hauer1d0f9872009-01-26 17:29:10 +010067#else
68#define CPOS_CYP(y) ((y) & 0x3ff)
69#endif
Juergen Beisert72330b02008-12-16 11:44:07 +010070
71#define LCDC_LCWHB 0x10
72#define LCWHB_BK_EN (1<<31)
73#define LCWHB_CW(w) (((w) & 0x1f) << 24)
74#define LCWHB_CH(h) (((h) & 0x1f) << 16)
75#define LCWHB_BD(x) ((x) & 0xff)
76
77#define LCDC_LCHCC 0x14
Sascha Hauer1d0f9872009-01-26 17:29:10 +010078
79#ifdef CONFIG_ARCH_MX1
Juergen Beisert72330b02008-12-16 11:44:07 +010080#define LCHCC_CUR_COL_R(r) (((r) & 0x1f) << 11)
81#define LCHCC_CUR_COL_G(g) (((g) & 0x3f) << 5)
82#define LCHCC_CUR_COL_B(b) ((b) & 0x1f)
Sascha Hauer1d0f9872009-01-26 17:29:10 +010083#else
84#define LCHCC_CUR_COL_R(r) (((r) & 0x3f) << 12)
85#define LCHCC_CUR_COL_G(g) (((g) & 0x3f) << 6)
86#define LCHCC_CUR_COL_B(b) ((b) & 0x3f)
87#endif
Juergen Beisert72330b02008-12-16 11:44:07 +010088
89#define LCDC_PCR 0x18
90
91#define LCDC_HCR 0x1C
92#define HCR_H_WIDTH(x) (((x) & 0x3f) << 26)
93#define HCR_H_WAIT_1(x) (((x) & 0xff) << 8)
94#define HCR_H_WAIT_2(x) ((x) & 0xff)
95
96#define LCDC_VCR 0x20
97#define VCR_V_WIDTH(x) (((x) & 0x3f) << 26)
98#define VCR_V_WAIT_1(x) (((x) & 0xff) << 8)
99#define VCR_V_WAIT_2(x) ((x) & 0xff)
100
101#define LCDC_POS 0x24
102#define POS_POS(x) ((x) & 1f)
103
104#define LCDC_LSCR1 0x28
105/* bit fields in imxfb.h */
106
107#define LCDC_PWMR 0x2C
108/* bit fields in imxfb.h */
109
110#define LCDC_DMACR 0x30
111/* bit fields in imxfb.h */
112
113#define LCDC_RMCR 0x34
Sascha Hauer1d0f9872009-01-26 17:29:10 +0100114
115#ifdef CONFIG_ARCH_MX1
Juergen Beisert72330b02008-12-16 11:44:07 +0100116#define RMCR_LCDC_EN (1<<1)
Sascha Hauer1d0f9872009-01-26 17:29:10 +0100117#else
118#define RMCR_LCDC_EN 0
119#endif
120
Juergen Beisert72330b02008-12-16 11:44:07 +0100121#define RMCR_SELF_REF (1<<0)
122
123#define LCDC_LCDICR 0x38
124#define LCDICR_INT_SYN (1<<2)
125#define LCDICR_INT_CON (1)
126
127#define LCDC_LCDISR 0x40
128#define LCDISR_UDR_ERR (1<<3)
129#define LCDISR_ERR_RES (1<<2)
130#define LCDISR_EOF (1<<1)
131#define LCDISR_BOF (1<<0)
132
Sascha Hauer343684f2009-03-19 08:25:41 +0100133/* Used fb-mode. Can be set on kernel command line, therefore file-static. */
134static const char *fb_mode;
135
136
Sascha Hauer24b9baf2008-12-16 11:44:08 +0100137/*
138 * These are the bitfields for each
139 * display depth that we support.
140 */
141struct imxfb_rgb {
142 struct fb_bitfield red;
143 struct fb_bitfield green;
144 struct fb_bitfield blue;
145 struct fb_bitfield transp;
146};
147
Sascha Hauer24b9baf2008-12-16 11:44:08 +0100148struct imxfb_info {
149 struct platform_device *pdev;
150 void __iomem *regs;
Sascha Hauerf909ef62009-01-15 15:21:00 +0100151 struct clk *clk;
Sascha Hauer24b9baf2008-12-16 11:44:08 +0100152
Sascha Hauer24b9baf2008-12-16 11:44:08 +0100153 /*
154 * These are the addresses we mapped
155 * the framebuffer memory region to.
156 */
157 dma_addr_t map_dma;
158 u_char *map_cpu;
159 u_int map_size;
160
161 u_char *screen_cpu;
162 dma_addr_t screen_dma;
163 u_int palette_size;
164
165 dma_addr_t dbar1;
166 dma_addr_t dbar2;
167
168 u_int pcr;
169 u_int pwmr;
170 u_int lscr1;
171 u_int dmacr;
172 u_int cmap_inverse:1,
173 cmap_static:1,
174 unused:30;
175
Sascha Hauer343684f2009-03-19 08:25:41 +0100176 struct imx_fb_videomode *mode;
177 int num_modes;
178
Sascha Hauer24b9baf2008-12-16 11:44:08 +0100179 void (*lcd_power)(int);
180 void (*backlight_power)(int);
181};
182
183#define IMX_NAME "IMX"
184
185/*
186 * Minimum X and Y resolutions
187 */
188#define MIN_XRES 64
189#define MIN_YRES 64
190
Sascha Hauer15122222009-01-26 17:31:02 +0100191/* Actually this really is 18bit support, the lowest 2 bits of each colour
192 * are unused in hardware. We claim to have 24bit support to make software
193 * like X work, which does not support 18bit.
194 */
195static struct imxfb_rgb def_rgb_18 = {
196 .red = {.offset = 16, .length = 8,},
197 .green = {.offset = 8, .length = 8,},
198 .blue = {.offset = 0, .length = 8,},
199 .transp = {.offset = 0, .length = 0,},
200};
201
Sascha Hauer80eee6b2008-12-16 11:44:09 +0100202static struct imxfb_rgb def_rgb_16_tft = {
203 .red = {.offset = 11, .length = 5,},
204 .green = {.offset = 5, .length = 6,},
205 .blue = {.offset = 0, .length = 5,},
206 .transp = {.offset = 0, .length = 0,},
207};
208
209static struct imxfb_rgb def_rgb_16_stn = {
Sascha Hauer66c87192008-12-16 11:44:08 +0100210 .red = {.offset = 8, .length = 4,},
211 .green = {.offset = 4, .length = 4,},
212 .blue = {.offset = 0, .length = 4,},
213 .transp = {.offset = 0, .length = 0,},
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700214};
215
216static struct imxfb_rgb def_rgb_8 = {
Sascha Hauer66c87192008-12-16 11:44:08 +0100217 .red = {.offset = 0, .length = 8,},
218 .green = {.offset = 0, .length = 8,},
219 .blue = {.offset = 0, .length = 8,},
220 .transp = {.offset = 0, .length = 0,},
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700221};
222
Sascha Hauer66c87192008-12-16 11:44:08 +0100223static int imxfb_activate_var(struct fb_var_screeninfo *var,
224 struct fb_info *info);
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700225
226static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
227{
228 chan &= 0xffff;
229 chan >>= 16 - bf->length;
230 return chan << bf->offset;
231}
232
Sascha Hauer66c87192008-12-16 11:44:08 +0100233static int imxfb_setpalettereg(u_int regno, u_int red, u_int green, u_int blue,
234 u_int trans, struct fb_info *info)
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700235{
236 struct imxfb_info *fbi = info->par;
237 u_int val, ret = 1;
238
239#define CNVT_TOHW(val,width) ((((val)<<(width))+0x7FFF-(val))>>16)
240 if (regno < fbi->palette_size) {
241 val = (CNVT_TOHW(red, 4) << 8) |
242 (CNVT_TOHW(green,4) << 4) |
243 CNVT_TOHW(blue, 4);
244
Juergen Beisert72330b02008-12-16 11:44:07 +0100245 writel(val, fbi->regs + 0x800 + (regno << 2));
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700246 ret = 0;
247 }
248 return ret;
249}
250
Sascha Hauer66c87192008-12-16 11:44:08 +0100251static int imxfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700252 u_int trans, struct fb_info *info)
253{
254 struct imxfb_info *fbi = info->par;
255 unsigned int val;
256 int ret = 1;
257
258 /*
259 * If inverse mode was selected, invert all the colours
260 * rather than the register number. The register number
261 * is what you poke into the framebuffer to produce the
262 * colour you requested.
263 */
264 if (fbi->cmap_inverse) {
265 red = 0xffff - red;
266 green = 0xffff - green;
267 blue = 0xffff - blue;
268 }
269
270 /*
271 * If greyscale is true, then we convert the RGB value
272 * to greyscale no mater what visual we are using.
273 */
274 if (info->var.grayscale)
275 red = green = blue = (19595 * red + 38470 * green +
276 7471 * blue) >> 16;
277
278 switch (info->fix.visual) {
279 case FB_VISUAL_TRUECOLOR:
280 /*
281 * 12 or 16-bit True Colour. We encode the RGB value
282 * according to the RGB bitfield information.
283 */
284 if (regno < 16) {
285 u32 *pal = info->pseudo_palette;
286
287 val = chan_to_field(red, &info->var.red);
288 val |= chan_to_field(green, &info->var.green);
289 val |= chan_to_field(blue, &info->var.blue);
290
291 pal[regno] = val;
292 ret = 0;
293 }
294 break;
295
296 case FB_VISUAL_STATIC_PSEUDOCOLOR:
297 case FB_VISUAL_PSEUDOCOLOR:
298 ret = imxfb_setpalettereg(regno, red, green, blue, trans, info);
299 break;
300 }
301
302 return ret;
303}
304
Sascha Hauer343684f2009-03-19 08:25:41 +0100305static const struct imx_fb_videomode *imxfb_find_mode(struct imxfb_info *fbi)
306{
307 struct imx_fb_videomode *m;
308 int i;
309
310 for (i = 0, m = &fbi->mode[0]; i < fbi->num_modes; i++, m++) {
311 if (!strcmp(m->mode.name, fb_mode))
312 return m;
313 }
314 return NULL;
315}
316
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700317/*
318 * imxfb_check_var():
319 * Round up in the following order: bits_per_pixel, xres,
320 * yres, xres_virtual, yres_virtual, xoffset, yoffset, grayscale,
321 * bitfields, horizontal timing, vertical timing.
322 */
Sascha Hauer66c87192008-12-16 11:44:08 +0100323static int imxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700324{
325 struct imxfb_info *fbi = info->par;
Sascha Hauer80eee6b2008-12-16 11:44:09 +0100326 struct imxfb_rgb *rgb;
Sascha Hauer343684f2009-03-19 08:25:41 +0100327 const struct imx_fb_videomode *imxfb_mode;
328 unsigned long lcd_clk;
329 unsigned long long tmp;
330 u32 pcr = 0;
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700331
332 if (var->xres < MIN_XRES)
333 var->xres = MIN_XRES;
334 if (var->yres < MIN_YRES)
335 var->yres = MIN_YRES;
Sascha Hauer343684f2009-03-19 08:25:41 +0100336
337 imxfb_mode = imxfb_find_mode(fbi);
338 if (!imxfb_mode)
339 return -EINVAL;
340
341 var->xres = imxfb_mode->mode.xres;
342 var->yres = imxfb_mode->mode.yres;
343 var->bits_per_pixel = imxfb_mode->bpp;
344 var->pixclock = imxfb_mode->mode.pixclock;
345 var->hsync_len = imxfb_mode->mode.hsync_len;
346 var->left_margin = imxfb_mode->mode.left_margin;
347 var->right_margin = imxfb_mode->mode.right_margin;
348 var->vsync_len = imxfb_mode->mode.vsync_len;
349 var->upper_margin = imxfb_mode->mode.upper_margin;
350 var->lower_margin = imxfb_mode->mode.lower_margin;
351 var->sync = imxfb_mode->mode.sync;
352 var->xres_virtual = max(var->xres_virtual, var->xres);
353 var->yres_virtual = max(var->yres_virtual, var->yres);
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700354
355 pr_debug("var->bits_per_pixel=%d\n", var->bits_per_pixel);
Sascha Hauer343684f2009-03-19 08:25:41 +0100356
357 lcd_clk = clk_get_rate(fbi->clk);
358
359 tmp = var->pixclock * (unsigned long long)lcd_clk;
360
361 do_div(tmp, 1000000);
362
363 if (do_div(tmp, 1000000) > 500000)
364 tmp++;
365
366 pcr = (unsigned int)tmp;
367
368 if (--pcr > 0x3F) {
369 pcr = 0x3F;
370 printk(KERN_WARNING "Must limit pixel clock to %luHz\n",
371 lcd_clk / pcr);
372 }
373
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700374 switch (var->bits_per_pixel) {
Sascha Hauer15122222009-01-26 17:31:02 +0100375 case 32:
Sascha Hauer343684f2009-03-19 08:25:41 +0100376 pcr |= PCR_BPIX_18;
Sascha Hauer15122222009-01-26 17:31:02 +0100377 rgb = &def_rgb_18;
378 break;
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700379 case 16:
Sascha Hauer80eee6b2008-12-16 11:44:09 +0100380 default:
Sascha Hauer343684f2009-03-19 08:25:41 +0100381 if (cpu_is_mx1())
382 pcr |= PCR_BPIX_12;
383 else
384 pcr |= PCR_BPIX_16;
385
386 if (imxfb_mode->pcr & PCR_TFT)
Sascha Hauer80eee6b2008-12-16 11:44:09 +0100387 rgb = &def_rgb_16_tft;
388 else
389 rgb = &def_rgb_16_stn;
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700390 break;
391 case 8:
Sascha Hauer343684f2009-03-19 08:25:41 +0100392 pcr |= PCR_BPIX_8;
Sascha Hauer80eee6b2008-12-16 11:44:09 +0100393 rgb = &def_rgb_8;
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700394 break;
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700395 }
396
Sascha Hauer343684f2009-03-19 08:25:41 +0100397 /* add sync polarities */
398 pcr |= imxfb_mode->pcr & ~(0x3f | (7 << 25));
399
400 fbi->pcr = pcr;
401
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700402 /*
403 * Copy the RGB parameters for this display
404 * from the machine specific parameters.
405 */
Sascha Hauer80eee6b2008-12-16 11:44:09 +0100406 var->red = rgb->red;
407 var->green = rgb->green;
408 var->blue = rgb->blue;
409 var->transp = rgb->transp;
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700410
411 pr_debug("RGBT length = %d:%d:%d:%d\n",
412 var->red.length, var->green.length, var->blue.length,
413 var->transp.length);
414
415 pr_debug("RGBT offset = %d:%d:%d:%d\n",
416 var->red.offset, var->green.offset, var->blue.offset,
417 var->transp.offset);
418
419 return 0;
420}
421
422/*
423 * imxfb_set_par():
424 * Set the user defined part of the display for the specified console
425 */
426static int imxfb_set_par(struct fb_info *info)
427{
428 struct imxfb_info *fbi = info->par;
429 struct fb_var_screeninfo *var = &info->var;
430
Sascha Hauer15122222009-01-26 17:31:02 +0100431 if (var->bits_per_pixel == 16 || var->bits_per_pixel == 32)
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700432 info->fix.visual = FB_VISUAL_TRUECOLOR;
433 else if (!fbi->cmap_static)
434 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
435 else {
436 /*
437 * Some people have weird ideas about wanting static
438 * pseudocolor maps. I suspect their user space
439 * applications are broken.
440 */
441 info->fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
442 }
443
Sascha Hauer66c87192008-12-16 11:44:08 +0100444 info->fix.line_length = var->xres_virtual * var->bits_per_pixel / 8;
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700445 fbi->palette_size = var->bits_per_pixel == 8 ? 256 : 16;
446
447 imxfb_activate_var(var, info);
448
449 return 0;
450}
451
452static void imxfb_enable_controller(struct imxfb_info *fbi)
453{
454 pr_debug("Enabling LCD controller\n");
455
Juergen Beisert72330b02008-12-16 11:44:07 +0100456 writel(fbi->screen_dma, fbi->regs + LCDC_SSA);
457
Juergen Beisert72330b02008-12-16 11:44:07 +0100458 /* panning offset 0 (0 pixel offset) */
459 writel(0x00000000, fbi->regs + LCDC_POS);
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700460
461 /* disable hardware cursor */
Juergen Beisert72330b02008-12-16 11:44:07 +0100462 writel(readl(fbi->regs + LCDC_CPOS) & ~(CPOS_CC0 | CPOS_CC1),
463 fbi->regs + LCDC_CPOS);
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700464
Juergen Beisert72330b02008-12-16 11:44:07 +0100465 writel(RMCR_LCDC_EN, fbi->regs + LCDC_RMCR);
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700466
Sascha Hauerf909ef62009-01-15 15:21:00 +0100467 clk_enable(fbi->clk);
468
Sascha Hauer66c87192008-12-16 11:44:08 +0100469 if (fbi->backlight_power)
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700470 fbi->backlight_power(1);
Sascha Hauer66c87192008-12-16 11:44:08 +0100471 if (fbi->lcd_power)
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700472 fbi->lcd_power(1);
473}
474
475static void imxfb_disable_controller(struct imxfb_info *fbi)
476{
477 pr_debug("Disabling LCD controller\n");
478
Sascha Hauer66c87192008-12-16 11:44:08 +0100479 if (fbi->backlight_power)
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700480 fbi->backlight_power(0);
Sascha Hauer66c87192008-12-16 11:44:08 +0100481 if (fbi->lcd_power)
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700482 fbi->lcd_power(0);
483
Sascha Hauerf909ef62009-01-15 15:21:00 +0100484 clk_disable(fbi->clk);
485
Juergen Beisert72330b02008-12-16 11:44:07 +0100486 writel(0, fbi->regs + LCDC_RMCR);
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700487}
488
489static int imxfb_blank(int blank, struct fb_info *info)
490{
491 struct imxfb_info *fbi = info->par;
492
493 pr_debug("imxfb_blank: blank=%d\n", blank);
494
495 switch (blank) {
496 case FB_BLANK_POWERDOWN:
497 case FB_BLANK_VSYNC_SUSPEND:
498 case FB_BLANK_HSYNC_SUSPEND:
499 case FB_BLANK_NORMAL:
500 imxfb_disable_controller(fbi);
501 break;
502
503 case FB_BLANK_UNBLANK:
504 imxfb_enable_controller(fbi);
505 break;
506 }
507 return 0;
508}
509
510static struct fb_ops imxfb_ops = {
511 .owner = THIS_MODULE,
512 .fb_check_var = imxfb_check_var,
513 .fb_set_par = imxfb_set_par,
514 .fb_setcolreg = imxfb_setcolreg,
515 .fb_fillrect = cfb_fillrect,
516 .fb_copyarea = cfb_copyarea,
517 .fb_imageblit = cfb_imageblit,
518 .fb_blank = imxfb_blank,
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700519};
520
521/*
522 * imxfb_activate_var():
523 * Configures LCD Controller based on entries in var parameter. Settings are
524 * only written to the controller if changes were made.
525 */
526static int imxfb_activate_var(struct fb_var_screeninfo *var, struct fb_info *info)
527{
528 struct imxfb_info *fbi = info->par;
Sascha Hauerf909ef62009-01-15 15:21:00 +0100529
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700530 pr_debug("var: xres=%d hslen=%d lm=%d rm=%d\n",
531 var->xres, var->hsync_len,
532 var->left_margin, var->right_margin);
533 pr_debug("var: yres=%d vslen=%d um=%d bm=%d\n",
534 var->yres, var->vsync_len,
535 var->upper_margin, var->lower_margin);
536
537#if DEBUG_VAR
538 if (var->xres < 16 || var->xres > 1024)
539 printk(KERN_ERR "%s: invalid xres %d\n",
540 info->fix.id, var->xres);
541 if (var->hsync_len < 1 || var->hsync_len > 64)
542 printk(KERN_ERR "%s: invalid hsync_len %d\n",
543 info->fix.id, var->hsync_len);
544 if (var->left_margin > 255)
545 printk(KERN_ERR "%s: invalid left_margin %d\n",
546 info->fix.id, var->left_margin);
547 if (var->right_margin > 255)
548 printk(KERN_ERR "%s: invalid right_margin %d\n",
549 info->fix.id, var->right_margin);
550 if (var->yres < 1 || var->yres > 511)
551 printk(KERN_ERR "%s: invalid yres %d\n",
552 info->fix.id, var->yres);
553 if (var->vsync_len > 100)
554 printk(KERN_ERR "%s: invalid vsync_len %d\n",
555 info->fix.id, var->vsync_len);
556 if (var->upper_margin > 63)
557 printk(KERN_ERR "%s: invalid upper_margin %d\n",
558 info->fix.id, var->upper_margin);
559 if (var->lower_margin > 255)
560 printk(KERN_ERR "%s: invalid lower_margin %d\n",
561 info->fix.id, var->lower_margin);
562#endif
563
Sascha Hauer343684f2009-03-19 08:25:41 +0100564 /* physical screen start address */
565 writel(VPW_VPW(var->xres * var->bits_per_pixel / 8 / 4),
566 fbi->regs + LCDC_VPW);
567
Sascha Hauer7e8549b2009-02-14 16:29:38 +0100568 writel(HCR_H_WIDTH(var->hsync_len - 1) |
569 HCR_H_WAIT_1(var->right_margin - 1) |
570 HCR_H_WAIT_2(var->left_margin - 3),
Juergen Beisert72330b02008-12-16 11:44:07 +0100571 fbi->regs + LCDC_HCR);
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700572
Juergen Beisert72330b02008-12-16 11:44:07 +0100573 writel(VCR_V_WIDTH(var->vsync_len) |
Sascha Hauerd6ed5752008-12-16 11:44:08 +0100574 VCR_V_WAIT_1(var->lower_margin) |
575 VCR_V_WAIT_2(var->upper_margin),
Juergen Beisert72330b02008-12-16 11:44:07 +0100576 fbi->regs + LCDC_VCR);
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700577
Juergen Beisert72330b02008-12-16 11:44:07 +0100578 writel(SIZE_XMAX(var->xres) | SIZE_YMAX(var->yres),
579 fbi->regs + LCDC_SIZE);
Sascha Hauerf909ef62009-01-15 15:21:00 +0100580
Sascha Hauer343684f2009-03-19 08:25:41 +0100581 writel(fbi->pcr, fbi->regs + LCDC_PCR);
Juergen Beisert72330b02008-12-16 11:44:07 +0100582 writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
583 writel(fbi->lscr1, fbi->regs + LCDC_LSCR1);
584 writel(fbi->dmacr, fbi->regs + LCDC_DMACR);
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700585
586 return 0;
587}
588
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700589#ifdef CONFIG_PM
590/*
591 * Power management hooks. Note that we won't be called from IRQ context,
592 * unlike the blank functions above, so we may sleep.
593 */
Russell King3ae5eae2005-11-09 22:32:44 +0000594static int imxfb_suspend(struct platform_device *dev, pm_message_t state)
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700595{
Russell King3ae5eae2005-11-09 22:32:44 +0000596 struct imxfb_info *fbi = platform_get_drvdata(dev);
Sascha Hauer66c87192008-12-16 11:44:08 +0100597
598 pr_debug("%s\n", __func__);
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700599
Russell King9480e302005-10-28 09:52:56 -0700600 imxfb_disable_controller(fbi);
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700601 return 0;
602}
603
Russell King3ae5eae2005-11-09 22:32:44 +0000604static int imxfb_resume(struct platform_device *dev)
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700605{
Russell King3ae5eae2005-11-09 22:32:44 +0000606 struct imxfb_info *fbi = platform_get_drvdata(dev);
Sascha Hauer66c87192008-12-16 11:44:08 +0100607
608 pr_debug("%s\n", __func__);
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700609
Russell King9480e302005-10-28 09:52:56 -0700610 imxfb_enable_controller(fbi);
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700611 return 0;
612}
613#else
614#define imxfb_suspend NULL
615#define imxfb_resume NULL
616#endif
617
Juergen Beisert72330b02008-12-16 11:44:07 +0100618static int __init imxfb_init_fbinfo(struct platform_device *pdev)
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700619{
Sascha Hauer27889272008-12-16 11:44:09 +0100620 struct imx_fb_platform_data *pdata = pdev->dev.platform_data;
Juergen Beisert72330b02008-12-16 11:44:07 +0100621 struct fb_info *info = dev_get_drvdata(&pdev->dev);
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700622 struct imxfb_info *fbi = info->par;
Sascha Hauer343684f2009-03-19 08:25:41 +0100623 struct imx_fb_videomode *m;
624 int i;
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700625
Harvey Harrison5ae12172008-04-28 02:15:47 -0700626 pr_debug("%s\n",__func__);
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700627
Sascha Hauer66c87192008-12-16 11:44:08 +0100628 info->pseudo_palette = kmalloc(sizeof(u32) * 16, GFP_KERNEL);
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700629 if (!info->pseudo_palette)
630 return -ENOMEM;
631
632 memset(fbi, 0, sizeof(struct imxfb_info));
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700633
634 strlcpy(info->fix.id, IMX_NAME, sizeof(info->fix.id));
635
Sascha Hauer66c87192008-12-16 11:44:08 +0100636 info->fix.type = FB_TYPE_PACKED_PIXELS;
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700637 info->fix.type_aux = 0;
638 info->fix.xpanstep = 0;
639 info->fix.ypanstep = 0;
640 info->fix.ywrapstep = 0;
Sascha Hauer66c87192008-12-16 11:44:08 +0100641 info->fix.accel = FB_ACCEL_NONE;
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700642
643 info->var.nonstd = 0;
644 info->var.activate = FB_ACTIVATE_NOW;
645 info->var.height = -1;
646 info->var.width = -1;
647 info->var.accel_flags = 0;
Sascha Hauer66c87192008-12-16 11:44:08 +0100648 info->var.vmode = FB_VMODE_NONINTERLACED;
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700649
650 info->fbops = &imxfb_ops;
Sascha Hauer66c87192008-12-16 11:44:08 +0100651 info->flags = FBINFO_FLAG_DEFAULT |
652 FBINFO_READS_FAST;
Sascha Hauer27889272008-12-16 11:44:09 +0100653 info->var.grayscale = pdata->cmap_greyscale;
654 fbi->cmap_inverse = pdata->cmap_inverse;
655 fbi->cmap_static = pdata->cmap_static;
Sascha Hauer27889272008-12-16 11:44:09 +0100656 fbi->lscr1 = pdata->lscr1;
657 fbi->dmacr = pdata->dmacr;
658 fbi->pwmr = pdata->pwmr;
659 fbi->lcd_power = pdata->lcd_power;
660 fbi->backlight_power = pdata->backlight_power;
Sascha Hauer343684f2009-03-19 08:25:41 +0100661
662 for (i = 0, m = &pdata->mode[0]; i < pdata->num_modes; i++, m++)
663 info->fix.smem_len = max_t(size_t, info->fix.smem_len,
664 m->mode.xres * m->mode.yres * m->bpp / 8);
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700665
666 return 0;
667}
668
Russell King3ae5eae2005-11-09 22:32:44 +0000669static int __init imxfb_probe(struct platform_device *pdev)
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700670{
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700671 struct imxfb_info *fbi;
672 struct fb_info *info;
Sascha Hauer27889272008-12-16 11:44:09 +0100673 struct imx_fb_platform_data *pdata;
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700674 struct resource *res;
Sascha Hauer343684f2009-03-19 08:25:41 +0100675 int ret, i;
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700676
Sascha Hauerd6b51502009-06-29 11:41:09 +0200677 dev_info(&pdev->dev, "i.MX Framebuffer driver\n");
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700678
679 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
Sascha Hauer66c87192008-12-16 11:44:08 +0100680 if (!res)
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700681 return -ENODEV;
682
Sascha Hauer27889272008-12-16 11:44:09 +0100683 pdata = pdev->dev.platform_data;
684 if (!pdata) {
Pavel Pisaf99c8922006-01-07 10:44:32 +0000685 dev_err(&pdev->dev,"No platform_data available\n");
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700686 return -ENOMEM;
687 }
688
Russell King3ae5eae2005-11-09 22:32:44 +0000689 info = framebuffer_alloc(sizeof(struct imxfb_info), &pdev->dev);
Sascha Hauer66c87192008-12-16 11:44:08 +0100690 if (!info)
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700691 return -ENOMEM;
692
693 fbi = info->par;
694
Sascha Hauer343684f2009-03-19 08:25:41 +0100695 if (!fb_mode)
696 fb_mode = pdata->mode[0].mode.name;
697
Russell King3ae5eae2005-11-09 22:32:44 +0000698 platform_set_drvdata(pdev, info);
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700699
Juergen Beisert72330b02008-12-16 11:44:07 +0100700 ret = imxfb_init_fbinfo(pdev);
Sascha Hauer66c87192008-12-16 11:44:08 +0100701 if (ret < 0)
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700702 goto failed_init;
703
Juergen Beisert72330b02008-12-16 11:44:07 +0100704 res = request_mem_region(res->start, resource_size(res),
705 DRIVER_NAME);
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700706 if (!res) {
707 ret = -EBUSY;
Juergen Beisert72330b02008-12-16 11:44:07 +0100708 goto failed_req;
709 }
710
Sascha Hauerf909ef62009-01-15 15:21:00 +0100711 fbi->clk = clk_get(&pdev->dev, NULL);
712 if (IS_ERR(fbi->clk)) {
713 ret = PTR_ERR(fbi->clk);;
714 dev_err(&pdev->dev, "unable to get clock: %d\n", ret);
715 goto failed_getclock;
716 }
717
Juergen Beisert72330b02008-12-16 11:44:07 +0100718 fbi->regs = ioremap(res->start, resource_size(res));
719 if (fbi->regs == NULL) {
Sascha Hauerd6b51502009-06-29 11:41:09 +0200720 dev_err(&pdev->dev, "Cannot map frame buffer registers\n");
Juergen Beisert72330b02008-12-16 11:44:07 +0100721 goto failed_ioremap;
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700722 }
723
Sascha Hauer27889272008-12-16 11:44:09 +0100724 if (!pdata->fixed_screen_cpu) {
Juergen Beisert72330b02008-12-16 11:44:07 +0100725 fbi->map_size = PAGE_ALIGN(info->fix.smem_len);
726 fbi->map_cpu = dma_alloc_writecombine(&pdev->dev,
727 fbi->map_size, &fbi->map_dma, GFP_KERNEL);
728
729 if (!fbi->map_cpu) {
Pavel Pisaf99c8922006-01-07 10:44:32 +0000730 dev_err(&pdev->dev, "Failed to allocate video RAM: %d\n", ret);
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700731 ret = -ENOMEM;
732 goto failed_map;
733 }
Juergen Beisert72330b02008-12-16 11:44:07 +0100734
735 info->screen_base = fbi->map_cpu;
736 fbi->screen_cpu = fbi->map_cpu;
737 fbi->screen_dma = fbi->map_dma;
738 info->fix.smem_start = fbi->screen_dma;
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700739 } else {
740 /* Fixed framebuffer mapping enables location of the screen in eSRAM */
Sascha Hauer27889272008-12-16 11:44:09 +0100741 fbi->map_cpu = pdata->fixed_screen_cpu;
742 fbi->map_dma = pdata->fixed_screen_dma;
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700743 info->screen_base = fbi->map_cpu;
744 fbi->screen_cpu = fbi->map_cpu;
745 fbi->screen_dma = fbi->map_dma;
746 info->fix.smem_start = fbi->screen_dma;
747 }
748
Sascha Hauerc0b90a32009-01-15 15:37:22 +0100749 if (pdata->init) {
750 ret = pdata->init(fbi->pdev);
751 if (ret)
752 goto failed_platform_init;
753 }
754
Sascha Hauer343684f2009-03-19 08:25:41 +0100755 fbi->mode = pdata->mode;
756 fbi->num_modes = pdata->num_modes;
757
758 INIT_LIST_HEAD(&info->modelist);
759 for (i = 0; i < pdata->num_modes; i++)
760 fb_add_videomode(&pdata->mode[i].mode, &info->modelist);
761
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700762 /*
763 * This makes sure that our colour bitfield
764 * descriptors are correctly initialised.
765 */
766 imxfb_check_var(&info->var, info);
767
Sascha Hauer66c87192008-12-16 11:44:08 +0100768 ret = fb_alloc_cmap(&info->cmap, 1 << info->var.bits_per_pixel, 0);
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700769 if (ret < 0)
770 goto failed_cmap;
771
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700772 imxfb_set_par(info);
773 ret = register_framebuffer(info);
774 if (ret < 0) {
Pavel Pisaf99c8922006-01-07 10:44:32 +0000775 dev_err(&pdev->dev, "failed to register framebuffer\n");
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700776 goto failed_register;
777 }
778
779 imxfb_enable_controller(fbi);
780
781 return 0;
782
783failed_register:
784 fb_dealloc_cmap(&info->cmap);
785failed_cmap:
Sascha Hauerc0b90a32009-01-15 15:37:22 +0100786 if (pdata->exit)
787 pdata->exit(fbi->pdev);
788failed_platform_init:
Sascha Hauer27889272008-12-16 11:44:09 +0100789 if (!pdata->fixed_screen_cpu)
Russell King3ae5eae2005-11-09 22:32:44 +0000790 dma_free_writecombine(&pdev->dev,fbi->map_size,fbi->map_cpu,
Juergen Beisert72330b02008-12-16 11:44:07 +0100791 fbi->map_dma);
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700792failed_map:
Sascha Hauerf909ef62009-01-15 15:21:00 +0100793 clk_put(fbi->clk);
794failed_getclock:
Juergen Beisert72330b02008-12-16 11:44:07 +0100795 iounmap(fbi->regs);
796failed_ioremap:
Sascha Hauerd6b51502009-06-29 11:41:09 +0200797 release_mem_region(res->start, resource_size(res));
Juergen Beisert72330b02008-12-16 11:44:07 +0100798failed_req:
799 kfree(info->pseudo_palette);
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700800failed_init:
Russell King3ae5eae2005-11-09 22:32:44 +0000801 platform_set_drvdata(pdev, NULL);
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700802 framebuffer_release(info);
803 return ret;
804}
805
Juergen Beisert72330b02008-12-16 11:44:07 +0100806static int __devexit imxfb_remove(struct platform_device *pdev)
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700807{
Sascha Hauerc0b90a32009-01-15 15:37:22 +0100808 struct imx_fb_platform_data *pdata;
Russell King3ae5eae2005-11-09 22:32:44 +0000809 struct fb_info *info = platform_get_drvdata(pdev);
Sascha Hauer772a9e62005-07-17 20:15:36 +0100810 struct imxfb_info *fbi = info->par;
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700811 struct resource *res;
812
813 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
814
Sascha Hauer772a9e62005-07-17 20:15:36 +0100815 imxfb_disable_controller(fbi);
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700816
817 unregister_framebuffer(info);
818
Sascha Hauerc0b90a32009-01-15 15:37:22 +0100819 pdata = pdev->dev.platform_data;
820 if (pdata->exit)
821 pdata->exit(fbi->pdev);
822
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700823 fb_dealloc_cmap(&info->cmap);
824 kfree(info->pseudo_palette);
825 framebuffer_release(info);
826
Juergen Beisert72330b02008-12-16 11:44:07 +0100827 iounmap(fbi->regs);
Sascha Hauerd6b51502009-06-29 11:41:09 +0200828 release_mem_region(res->start, resource_size(res));
Sascha Hauerf909ef62009-01-15 15:21:00 +0100829 clk_disable(fbi->clk);
830 clk_put(fbi->clk);
831
Russell King3ae5eae2005-11-09 22:32:44 +0000832 platform_set_drvdata(pdev, NULL);
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700833
834 return 0;
835}
836
Russell King3ae5eae2005-11-09 22:32:44 +0000837void imxfb_shutdown(struct platform_device * dev)
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700838{
Russell King3ae5eae2005-11-09 22:32:44 +0000839 struct fb_info *info = platform_get_drvdata(dev);
Sascha Hauer772a9e62005-07-17 20:15:36 +0100840 struct imxfb_info *fbi = info->par;
841 imxfb_disable_controller(fbi);
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700842}
843
Russell King3ae5eae2005-11-09 22:32:44 +0000844static struct platform_driver imxfb_driver = {
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700845 .suspend = imxfb_suspend,
846 .resume = imxfb_resume,
Juergen Beisert72330b02008-12-16 11:44:07 +0100847 .remove = __devexit_p(imxfb_remove),
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700848 .shutdown = imxfb_shutdown,
Russell King3ae5eae2005-11-09 22:32:44 +0000849 .driver = {
Juergen Beisert72330b02008-12-16 11:44:07 +0100850 .name = DRIVER_NAME,
Russell King3ae5eae2005-11-09 22:32:44 +0000851 },
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700852};
853
Sascha Hauer343684f2009-03-19 08:25:41 +0100854static int imxfb_setup(void)
855{
856#ifndef MODULE
857 char *opt, *options = NULL;
858
859 if (fb_get_options("imxfb", &options))
860 return -ENODEV;
861
862 if (!options || !*options)
863 return 0;
864
865 while ((opt = strsep(&options, ",")) != NULL) {
866 if (!*opt)
867 continue;
868 else
869 fb_mode = opt;
870 }
871#endif
872 return 0;
873}
874
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700875int __init imxfb_init(void)
876{
Sascha Hauer343684f2009-03-19 08:25:41 +0100877 int ret = imxfb_setup();
878
879 if (ret < 0)
880 return ret;
881
Juergen Beisert72330b02008-12-16 11:44:07 +0100882 return platform_driver_probe(&imxfb_driver, imxfb_probe);
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700883}
884
885static void __exit imxfb_cleanup(void)
886{
Russell King3ae5eae2005-11-09 22:32:44 +0000887 platform_driver_unregister(&imxfb_driver);
Sascha Hauer7c2f891c2005-05-01 08:59:24 -0700888}
889
890module_init(imxfb_init);
891module_exit(imxfb_cleanup);
892
893MODULE_DESCRIPTION("Motorola i.MX framebuffer driver");
894MODULE_AUTHOR("Sascha Hauer, Pengutronix");
895MODULE_LICENSE("GPL");