Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 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> |
David Brownell | a9a84c3 | 2008-02-06 01:39:26 -0800 | [diff] [blame] | 19 | #include <linux/backlight.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 20 | #include <linux/gfp.h> |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 21 | |
Russell King | a09e64f | 2008-08-05 16:14:15 +0100 | [diff] [blame] | 22 | #include <mach/board.h> |
| 23 | #include <mach/cpu.h> |
| 24 | #include <mach/gpio.h> |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 25 | |
| 26 | #include <video/atmel_lcdc.h> |
| 27 | |
| 28 | #define lcdc_readl(sinfo, reg) __raw_readl((sinfo)->mmio+(reg)) |
| 29 | #define lcdc_writel(sinfo, reg, val) __raw_writel((val), (sinfo)->mmio+(reg)) |
| 30 | |
| 31 | /* configurable parameters */ |
| 32 | #define ATMEL_LCDC_CVAL_DEFAULT 0xc8 |
Nicolas Ferre | 53b7479 | 2009-05-28 14:34:36 -0700 | [diff] [blame] | 33 | #define ATMEL_LCDC_DMA_BURST_LEN 8 /* words */ |
| 34 | #define ATMEL_LCDC_FIFO_SIZE 512 /* words */ |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 35 | |
| 36 | #if defined(CONFIG_ARCH_AT91) |
Haavard Skinnemoen | e730d8b0a | 2008-08-12 15:08:56 -0700 | [diff] [blame] | 37 | #define ATMEL_LCDFB_FBINFO_DEFAULT (FBINFO_DEFAULT \ |
| 38 | | FBINFO_PARTIAL_PAN_OK \ |
| 39 | | FBINFO_HWACCEL_YPAN) |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 40 | |
| 41 | static inline void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info *sinfo, |
| 42 | struct fb_var_screeninfo *var) |
| 43 | { |
| 44 | |
| 45 | } |
| 46 | #elif defined(CONFIG_AVR32) |
| 47 | #define ATMEL_LCDFB_FBINFO_DEFAULT (FBINFO_DEFAULT \ |
| 48 | | FBINFO_PARTIAL_PAN_OK \ |
| 49 | | FBINFO_HWACCEL_XPAN \ |
| 50 | | FBINFO_HWACCEL_YPAN) |
| 51 | |
| 52 | static void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info *sinfo, |
| 53 | struct fb_var_screeninfo *var) |
| 54 | { |
| 55 | u32 dma2dcfg; |
| 56 | u32 pixeloff; |
| 57 | |
| 58 | pixeloff = (var->xoffset * var->bits_per_pixel) & 0x1f; |
| 59 | |
| 60 | dma2dcfg = ((var->xres_virtual - var->xres) * var->bits_per_pixel) / 8; |
| 61 | dma2dcfg |= pixeloff << ATMEL_LCDC_PIXELOFF_OFFSET; |
| 62 | lcdc_writel(sinfo, ATMEL_LCDC_DMA2DCFG, dma2dcfg); |
| 63 | |
| 64 | /* Update configuration */ |
| 65 | lcdc_writel(sinfo, ATMEL_LCDC_DMACON, |
| 66 | lcdc_readl(sinfo, ATMEL_LCDC_DMACON) |
| 67 | | ATMEL_LCDC_DMAUPDT); |
| 68 | } |
| 69 | #endif |
| 70 | |
David Brownell | a9a84c3 | 2008-02-06 01:39:26 -0800 | [diff] [blame] | 71 | static const u32 contrast_ctr = ATMEL_LCDC_PS_DIV8 |
| 72 | | ATMEL_LCDC_POL_POSITIVE |
| 73 | | ATMEL_LCDC_ENA_PWMENABLE; |
| 74 | |
| 75 | #ifdef CONFIG_BACKLIGHT_ATMEL_LCDC |
| 76 | |
| 77 | /* some bl->props field just changed */ |
| 78 | static int atmel_bl_update_status(struct backlight_device *bl) |
| 79 | { |
| 80 | struct atmel_lcdfb_info *sinfo = bl_get_data(bl); |
| 81 | int power = sinfo->bl_power; |
| 82 | int brightness = bl->props.brightness; |
| 83 | |
| 84 | /* REVISIT there may be a meaningful difference between |
| 85 | * fb_blank and power ... there seem to be some cases |
| 86 | * this doesn't handle correctly. |
| 87 | */ |
| 88 | if (bl->props.fb_blank != sinfo->bl_power) |
| 89 | power = bl->props.fb_blank; |
| 90 | else if (bl->props.power != sinfo->bl_power) |
| 91 | power = bl->props.power; |
| 92 | |
| 93 | if (brightness < 0 && power == FB_BLANK_UNBLANK) |
| 94 | brightness = lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL); |
| 95 | else if (power != FB_BLANK_UNBLANK) |
| 96 | brightness = 0; |
| 97 | |
| 98 | lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_VAL, brightness); |
| 99 | lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, |
| 100 | brightness ? contrast_ctr : 0); |
| 101 | |
| 102 | bl->props.fb_blank = bl->props.power = sinfo->bl_power = power; |
| 103 | |
| 104 | return 0; |
| 105 | } |
| 106 | |
| 107 | static int atmel_bl_get_brightness(struct backlight_device *bl) |
| 108 | { |
| 109 | struct atmel_lcdfb_info *sinfo = bl_get_data(bl); |
| 110 | |
| 111 | return lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL); |
| 112 | } |
| 113 | |
Lionel Debroux | acc2472 | 2010-11-16 14:14:02 +0100 | [diff] [blame] | 114 | static const struct backlight_ops atmel_lcdc_bl_ops = { |
David Brownell | a9a84c3 | 2008-02-06 01:39:26 -0800 | [diff] [blame] | 115 | .update_status = atmel_bl_update_status, |
| 116 | .get_brightness = atmel_bl_get_brightness, |
| 117 | }; |
| 118 | |
| 119 | static void init_backlight(struct atmel_lcdfb_info *sinfo) |
| 120 | { |
Matthew Garrett | a19a6ee | 2010-02-17 16:39:44 -0500 | [diff] [blame] | 121 | struct backlight_properties props; |
David Brownell | a9a84c3 | 2008-02-06 01:39:26 -0800 | [diff] [blame] | 122 | struct backlight_device *bl; |
| 123 | |
| 124 | sinfo->bl_power = FB_BLANK_UNBLANK; |
| 125 | |
| 126 | if (sinfo->backlight) |
| 127 | return; |
| 128 | |
Matthew Garrett | a19a6ee | 2010-02-17 16:39:44 -0500 | [diff] [blame] | 129 | memset(&props, 0, sizeof(struct backlight_properties)); |
Matthew Garrett | bb7ca74 | 2011-03-22 16:30:21 -0700 | [diff] [blame^] | 130 | props.type = BACKLIGHT_RAW; |
Matthew Garrett | a19a6ee | 2010-02-17 16:39:44 -0500 | [diff] [blame] | 131 | props.max_brightness = 0xff; |
| 132 | bl = backlight_device_register("backlight", &sinfo->pdev->dev, sinfo, |
| 133 | &atmel_lcdc_bl_ops, &props); |
Julien Brunel | cf7b9a1 | 2008-11-19 15:36:07 -0800 | [diff] [blame] | 134 | if (IS_ERR(bl)) { |
David Brownell | a9a84c3 | 2008-02-06 01:39:26 -0800 | [diff] [blame] | 135 | dev_err(&sinfo->pdev->dev, "error %ld on backlight register\n", |
| 136 | PTR_ERR(bl)); |
| 137 | return; |
| 138 | } |
| 139 | sinfo->backlight = bl; |
| 140 | |
| 141 | bl->props.power = FB_BLANK_UNBLANK; |
| 142 | bl->props.fb_blank = FB_BLANK_UNBLANK; |
David Brownell | a9a84c3 | 2008-02-06 01:39:26 -0800 | [diff] [blame] | 143 | bl->props.brightness = atmel_bl_get_brightness(bl); |
| 144 | } |
| 145 | |
| 146 | static void exit_backlight(struct atmel_lcdfb_info *sinfo) |
| 147 | { |
| 148 | if (sinfo->backlight) |
| 149 | backlight_device_unregister(sinfo->backlight); |
| 150 | } |
| 151 | |
| 152 | #else |
| 153 | |
| 154 | static void init_backlight(struct atmel_lcdfb_info *sinfo) |
| 155 | { |
| 156 | dev_warn(&sinfo->pdev->dev, "backlight control is not available\n"); |
| 157 | } |
| 158 | |
| 159 | static void exit_backlight(struct atmel_lcdfb_info *sinfo) |
| 160 | { |
| 161 | } |
| 162 | |
| 163 | #endif |
| 164 | |
| 165 | static void init_contrast(struct atmel_lcdfb_info *sinfo) |
| 166 | { |
| 167 | /* have some default contrast/backlight settings */ |
| 168 | lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, contrast_ctr); |
| 169 | lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_VAL, ATMEL_LCDC_CVAL_DEFAULT); |
| 170 | |
| 171 | if (sinfo->lcdcon_is_backlight) |
| 172 | init_backlight(sinfo); |
| 173 | } |
| 174 | |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 175 | |
| 176 | static struct fb_fix_screeninfo atmel_lcdfb_fix __initdata = { |
| 177 | .type = FB_TYPE_PACKED_PIXELS, |
| 178 | .visual = FB_VISUAL_TRUECOLOR, |
| 179 | .xpanstep = 0, |
Haavard Skinnemoen | e730d8b0a | 2008-08-12 15:08:56 -0700 | [diff] [blame] | 180 | .ypanstep = 1, |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 181 | .ywrapstep = 0, |
| 182 | .accel = FB_ACCEL_NONE, |
| 183 | }; |
| 184 | |
Nicolas Ferre | 250a269 | 2007-07-21 04:37:59 -0700 | [diff] [blame] | 185 | static unsigned long compute_hozval(unsigned long xres, unsigned long lcdcon2) |
| 186 | { |
| 187 | unsigned long value; |
| 188 | |
Nicolas Ferre | 915190f | 2009-07-21 11:31:29 +0100 | [diff] [blame] | 189 | if (!(cpu_is_at91sam9261() || cpu_is_at91sam9g10() |
| 190 | || cpu_is_at32ap7000())) |
Nicolas Ferre | 250a269 | 2007-07-21 04:37:59 -0700 | [diff] [blame] | 191 | return xres; |
| 192 | |
| 193 | value = xres; |
| 194 | if ((lcdcon2 & ATMEL_LCDC_DISTYPE) != ATMEL_LCDC_DISTYPE_TFT) { |
| 195 | /* STN display */ |
| 196 | if ((lcdcon2 & ATMEL_LCDC_DISTYPE) == ATMEL_LCDC_DISTYPE_STNCOLOR) { |
| 197 | value *= 3; |
| 198 | } |
| 199 | if ( (lcdcon2 & ATMEL_LCDC_IFWIDTH) == ATMEL_LCDC_IFWIDTH_4 |
| 200 | || ( (lcdcon2 & ATMEL_LCDC_IFWIDTH) == ATMEL_LCDC_IFWIDTH_8 |
| 201 | && (lcdcon2 & ATMEL_LCDC_SCANMOD) == ATMEL_LCDC_SCANMOD_DUAL )) |
| 202 | value = DIV_ROUND_UP(value, 4); |
| 203 | else |
| 204 | value = DIV_ROUND_UP(value, 8); |
| 205 | } |
| 206 | |
| 207 | return value; |
| 208 | } |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 209 | |
Haavard Skinnemoen | 3aa04f1 | 2008-09-13 02:33:23 -0700 | [diff] [blame] | 210 | static void atmel_lcdfb_stop_nowait(struct atmel_lcdfb_info *sinfo) |
| 211 | { |
| 212 | /* Turn off the LCD controller and the DMA controller */ |
| 213 | lcdc_writel(sinfo, ATMEL_LCDC_PWRCON, |
| 214 | sinfo->guard_time << ATMEL_LCDC_GUARDT_OFFSET); |
| 215 | |
| 216 | /* Wait for the LCDC core to become idle */ |
| 217 | while (lcdc_readl(sinfo, ATMEL_LCDC_PWRCON) & ATMEL_LCDC_BUSY) |
| 218 | msleep(10); |
| 219 | |
| 220 | lcdc_writel(sinfo, ATMEL_LCDC_DMACON, 0); |
| 221 | } |
| 222 | |
| 223 | static void atmel_lcdfb_stop(struct atmel_lcdfb_info *sinfo) |
| 224 | { |
| 225 | atmel_lcdfb_stop_nowait(sinfo); |
| 226 | |
| 227 | /* Wait for DMA engine to become idle... */ |
| 228 | while (lcdc_readl(sinfo, ATMEL_LCDC_DMACON) & ATMEL_LCDC_DMABUSY) |
| 229 | msleep(10); |
| 230 | } |
| 231 | |
| 232 | static void atmel_lcdfb_start(struct atmel_lcdfb_info *sinfo) |
| 233 | { |
| 234 | lcdc_writel(sinfo, ATMEL_LCDC_DMACON, sinfo->default_dmacon); |
| 235 | lcdc_writel(sinfo, ATMEL_LCDC_PWRCON, |
| 236 | (sinfo->guard_time << ATMEL_LCDC_GUARDT_OFFSET) |
| 237 | | ATMEL_LCDC_PWR); |
| 238 | } |
| 239 | |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 240 | static void atmel_lcdfb_update_dma(struct fb_info *info, |
| 241 | struct fb_var_screeninfo *var) |
| 242 | { |
| 243 | struct atmel_lcdfb_info *sinfo = info->par; |
| 244 | struct fb_fix_screeninfo *fix = &info->fix; |
| 245 | unsigned long dma_addr; |
| 246 | |
| 247 | dma_addr = (fix->smem_start + var->yoffset * fix->line_length |
| 248 | + var->xoffset * var->bits_per_pixel / 8); |
| 249 | |
| 250 | dma_addr &= ~3UL; |
| 251 | |
| 252 | /* Set framebuffer DMA base address and pixel offset */ |
| 253 | lcdc_writel(sinfo, ATMEL_LCDC_DMABADDR1, dma_addr); |
| 254 | |
| 255 | atmel_lcdfb_update_dma2d(sinfo, var); |
| 256 | } |
| 257 | |
| 258 | static inline void atmel_lcdfb_free_video_memory(struct atmel_lcdfb_info *sinfo) |
| 259 | { |
| 260 | struct fb_info *info = sinfo->info; |
| 261 | |
| 262 | dma_free_writecombine(info->device, info->fix.smem_len, |
| 263 | info->screen_base, info->fix.smem_start); |
| 264 | } |
| 265 | |
| 266 | /** |
| 267 | * atmel_lcdfb_alloc_video_memory - Allocate framebuffer memory |
| 268 | * @sinfo: the frame buffer to allocate memory for |
Krzysztof Helt | 1d01e83 | 2009-07-08 22:26:16 +0200 | [diff] [blame] | 269 | * |
| 270 | * This function is called only from the atmel_lcdfb_probe() |
| 271 | * so no locking by fb_info->mm_lock around smem_len setting is needed. |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 272 | */ |
| 273 | static int atmel_lcdfb_alloc_video_memory(struct atmel_lcdfb_info *sinfo) |
| 274 | { |
| 275 | struct fb_info *info = sinfo->info; |
| 276 | struct fb_var_screeninfo *var = &info->var; |
Haavard Skinnemoen | ea757ac | 2008-08-12 15:08:57 -0700 | [diff] [blame] | 277 | unsigned int smem_len; |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 278 | |
Haavard Skinnemoen | ea757ac | 2008-08-12 15:08:57 -0700 | [diff] [blame] | 279 | smem_len = (var->xres_virtual * var->yres_virtual |
| 280 | * ((var->bits_per_pixel + 7) / 8)); |
| 281 | info->fix.smem_len = max(smem_len, sinfo->smem_len); |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 282 | |
| 283 | info->screen_base = dma_alloc_writecombine(info->device, info->fix.smem_len, |
| 284 | (dma_addr_t *)&info->fix.smem_start, GFP_KERNEL); |
| 285 | |
| 286 | if (!info->screen_base) { |
| 287 | return -ENOMEM; |
| 288 | } |
| 289 | |
Haavard Skinnemoen | 01d3a5e | 2008-04-28 02:15:19 -0700 | [diff] [blame] | 290 | memset(info->screen_base, 0, info->fix.smem_len); |
| 291 | |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 292 | return 0; |
| 293 | } |
| 294 | |
Nicolas Ferre | 968910b | 2008-07-23 21:31:34 -0700 | [diff] [blame] | 295 | static const struct fb_videomode *atmel_lcdfb_choose_mode(struct fb_var_screeninfo *var, |
| 296 | struct fb_info *info) |
| 297 | { |
| 298 | struct fb_videomode varfbmode; |
| 299 | const struct fb_videomode *fbmode = NULL; |
| 300 | |
| 301 | fb_var_to_videomode(&varfbmode, var); |
| 302 | fbmode = fb_find_nearest_mode(&varfbmode, &info->modelist); |
| 303 | if (fbmode) |
| 304 | fb_videomode_to_var(var, fbmode); |
| 305 | return fbmode; |
| 306 | } |
| 307 | |
| 308 | |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 309 | /** |
| 310 | * atmel_lcdfb_check_var - Validates a var passed in. |
| 311 | * @var: frame buffer variable screen structure |
| 312 | * @info: frame buffer structure that represents a single frame buffer |
| 313 | * |
| 314 | * Checks to see if the hardware supports the state requested by |
| 315 | * var passed in. This function does not alter the hardware |
| 316 | * state!!! This means the data stored in struct fb_info and |
| 317 | * struct atmel_lcdfb_info do not change. This includes the var |
| 318 | * inside of struct fb_info. Do NOT change these. This function |
| 319 | * can be called on its own if we intent to only test a mode and |
| 320 | * not actually set it. The stuff in modedb.c is a example of |
| 321 | * this. If the var passed in is slightly off by what the |
| 322 | * hardware can support then we alter the var PASSED in to what |
| 323 | * we can do. If the hardware doesn't support mode change a |
| 324 | * -EINVAL will be returned by the upper layers. You don't need |
| 325 | * to implement this function then. If you hardware doesn't |
| 326 | * support changing the resolution then this function is not |
| 327 | * needed. In this case the driver would just provide a var that |
| 328 | * represents the static state the screen is in. |
| 329 | * |
| 330 | * Returns negative errno on error, or zero on success. |
| 331 | */ |
| 332 | static int atmel_lcdfb_check_var(struct fb_var_screeninfo *var, |
| 333 | struct fb_info *info) |
| 334 | { |
| 335 | struct device *dev = info->device; |
| 336 | struct atmel_lcdfb_info *sinfo = info->par; |
| 337 | unsigned long clk_value_khz; |
| 338 | |
| 339 | clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000; |
| 340 | |
| 341 | dev_dbg(dev, "%s:\n", __func__); |
Nicolas Ferre | 968910b | 2008-07-23 21:31:34 -0700 | [diff] [blame] | 342 | |
| 343 | if (!(var->pixclock && var->bits_per_pixel)) { |
| 344 | /* choose a suitable mode if possible */ |
| 345 | if (!atmel_lcdfb_choose_mode(var, info)) { |
| 346 | dev_err(dev, "needed value not specified\n"); |
| 347 | return -EINVAL; |
| 348 | } |
| 349 | } |
| 350 | |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 351 | dev_dbg(dev, " resolution: %ux%u\n", var->xres, var->yres); |
| 352 | dev_dbg(dev, " pixclk: %lu KHz\n", PICOS2KHZ(var->pixclock)); |
| 353 | dev_dbg(dev, " bpp: %u\n", var->bits_per_pixel); |
| 354 | dev_dbg(dev, " clk: %lu KHz\n", clk_value_khz); |
| 355 | |
Ben Nizette | 97b9a5a | 2009-06-16 15:34:24 -0700 | [diff] [blame] | 356 | if (PICOS2KHZ(var->pixclock) > clk_value_khz) { |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 357 | dev_err(dev, "%lu KHz pixel clock is too fast\n", PICOS2KHZ(var->pixclock)); |
| 358 | return -EINVAL; |
| 359 | } |
| 360 | |
Nicolas Ferre | 968910b | 2008-07-23 21:31:34 -0700 | [diff] [blame] | 361 | /* Do not allow to have real resoulution larger than virtual */ |
| 362 | if (var->xres > var->xres_virtual) |
| 363 | var->xres_virtual = var->xres; |
| 364 | |
| 365 | if (var->yres > var->yres_virtual) |
| 366 | var->yres_virtual = var->yres; |
| 367 | |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 368 | /* Force same alignment for each line */ |
| 369 | var->xres = (var->xres + 3) & ~3UL; |
| 370 | var->xres_virtual = (var->xres_virtual + 3) & ~3UL; |
| 371 | |
| 372 | var->red.msb_right = var->green.msb_right = var->blue.msb_right = 0; |
| 373 | var->transp.msb_right = 0; |
| 374 | var->transp.offset = var->transp.length = 0; |
| 375 | var->xoffset = var->yoffset = 0; |
| 376 | |
Stanislaw Gruszka | f928ac0a | 2008-10-15 22:03:43 -0700 | [diff] [blame] | 377 | if (info->fix.smem_len) { |
| 378 | unsigned int smem_len = (var->xres_virtual * var->yres_virtual |
| 379 | * ((var->bits_per_pixel + 7) / 8)); |
| 380 | if (smem_len > info->fix.smem_len) |
| 381 | return -EINVAL; |
| 382 | } |
| 383 | |
Haavard Skinnemoen | 162b3a0 | 2008-02-06 01:39:11 -0800 | [diff] [blame] | 384 | /* Saturate vertical and horizontal timings at maximum values */ |
| 385 | var->vsync_len = min_t(u32, var->vsync_len, |
| 386 | (ATMEL_LCDC_VPW >> ATMEL_LCDC_VPW_OFFSET) + 1); |
| 387 | var->upper_margin = min_t(u32, var->upper_margin, |
| 388 | ATMEL_LCDC_VBP >> ATMEL_LCDC_VBP_OFFSET); |
| 389 | var->lower_margin = min_t(u32, var->lower_margin, |
| 390 | ATMEL_LCDC_VFP); |
| 391 | var->right_margin = min_t(u32, var->right_margin, |
| 392 | (ATMEL_LCDC_HFP >> ATMEL_LCDC_HFP_OFFSET) + 1); |
| 393 | var->hsync_len = min_t(u32, var->hsync_len, |
| 394 | (ATMEL_LCDC_HPW >> ATMEL_LCDC_HPW_OFFSET) + 1); |
| 395 | var->left_margin = min_t(u32, var->left_margin, |
| 396 | ATMEL_LCDC_HBP + 1); |
| 397 | |
| 398 | /* Some parameters can't be zero */ |
| 399 | var->vsync_len = max_t(u32, var->vsync_len, 1); |
| 400 | var->right_margin = max_t(u32, var->right_margin, 1); |
| 401 | var->hsync_len = max_t(u32, var->hsync_len, 1); |
| 402 | var->left_margin = max_t(u32, var->left_margin, 1); |
| 403 | |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 404 | switch (var->bits_per_pixel) { |
Nicolas Ferre | 250a269 | 2007-07-21 04:37:59 -0700 | [diff] [blame] | 405 | case 1: |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 406 | case 2: |
| 407 | case 4: |
| 408 | case 8: |
| 409 | var->red.offset = var->green.offset = var->blue.offset = 0; |
| 410 | var->red.length = var->green.length = var->blue.length |
| 411 | = var->bits_per_pixel; |
| 412 | break; |
| 413 | case 15: |
| 414 | case 16: |
Nicolas Ferre | fd08580 | 2008-04-28 02:15:21 -0700 | [diff] [blame] | 415 | if (sinfo->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) { |
| 416 | /* RGB:565 mode */ |
| 417 | var->red.offset = 11; |
| 418 | var->blue.offset = 0; |
| 419 | var->green.length = 6; |
Guillaume GARDET | fbd03a1 | 2008-08-29 10:11:24 +0100 | [diff] [blame] | 420 | } else if (sinfo->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB555) { |
| 421 | var->red.offset = 10; |
| 422 | var->blue.offset = 0; |
| 423 | var->green.length = 5; |
Nicolas Ferre | fd08580 | 2008-04-28 02:15:21 -0700 | [diff] [blame] | 424 | } else { |
| 425 | /* BGR:555 mode */ |
| 426 | var->red.offset = 0; |
| 427 | var->blue.offset = 10; |
| 428 | var->green.length = 5; |
| 429 | } |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 430 | var->green.offset = 5; |
Nicolas Ferre | fd08580 | 2008-04-28 02:15:21 -0700 | [diff] [blame] | 431 | var->red.length = var->blue.length = 5; |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 432 | break; |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 433 | case 32: |
Haavard Skinnemoen | 4440e0e | 2007-07-21 04:38:02 -0700 | [diff] [blame] | 434 | var->transp.offset = 24; |
| 435 | var->transp.length = 8; |
| 436 | /* fall through */ |
| 437 | case 24: |
Nicolas Ferre | fd08580 | 2008-04-28 02:15:21 -0700 | [diff] [blame] | 438 | if (sinfo->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) { |
| 439 | /* RGB:888 mode */ |
| 440 | var->red.offset = 16; |
| 441 | var->blue.offset = 0; |
| 442 | } else { |
| 443 | /* BGR:888 mode */ |
| 444 | var->red.offset = 0; |
| 445 | var->blue.offset = 16; |
| 446 | } |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 447 | var->green.offset = 8; |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 448 | var->red.length = var->green.length = var->blue.length = 8; |
| 449 | break; |
| 450 | default: |
| 451 | dev_err(dev, "color depth %d not supported\n", |
| 452 | var->bits_per_pixel); |
| 453 | return -EINVAL; |
| 454 | } |
| 455 | |
| 456 | return 0; |
| 457 | } |
| 458 | |
Nicolas Ferre | d22579b | 2008-07-23 21:31:20 -0700 | [diff] [blame] | 459 | /* |
| 460 | * LCD reset sequence |
| 461 | */ |
| 462 | static void atmel_lcdfb_reset(struct atmel_lcdfb_info *sinfo) |
| 463 | { |
| 464 | might_sleep(); |
| 465 | |
Haavard Skinnemoen | 3aa04f1 | 2008-09-13 02:33:23 -0700 | [diff] [blame] | 466 | atmel_lcdfb_stop(sinfo); |
| 467 | atmel_lcdfb_start(sinfo); |
Nicolas Ferre | d22579b | 2008-07-23 21:31:20 -0700 | [diff] [blame] | 468 | } |
| 469 | |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 470 | /** |
| 471 | * atmel_lcdfb_set_par - Alters the hardware state. |
| 472 | * @info: frame buffer structure that represents a single frame buffer |
| 473 | * |
| 474 | * Using the fb_var_screeninfo in fb_info we set the resolution |
| 475 | * of the this particular framebuffer. This function alters the |
| 476 | * par AND the fb_fix_screeninfo stored in fb_info. It doesn't |
| 477 | * not alter var in fb_info since we are using that data. This |
| 478 | * means we depend on the data in var inside fb_info to be |
| 479 | * supported by the hardware. atmel_lcdfb_check_var is always called |
| 480 | * before atmel_lcdfb_set_par to ensure this. Again if you can't |
| 481 | * change the resolution you don't need this function. |
| 482 | * |
| 483 | */ |
| 484 | static int atmel_lcdfb_set_par(struct fb_info *info) |
| 485 | { |
| 486 | struct atmel_lcdfb_info *sinfo = info->par; |
Nicolas Ferre | 250a269 | 2007-07-21 04:37:59 -0700 | [diff] [blame] | 487 | unsigned long hozval_linesz; |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 488 | unsigned long value; |
| 489 | unsigned long clk_value_khz; |
Nicolas Ferre | 250a269 | 2007-07-21 04:37:59 -0700 | [diff] [blame] | 490 | unsigned long bits_per_line; |
Nicolas Ferre | 431861c | 2009-11-11 14:26:35 -0800 | [diff] [blame] | 491 | unsigned long pix_factor = 2; |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 492 | |
Nicolas Ferre | d22579b | 2008-07-23 21:31:20 -0700 | [diff] [blame] | 493 | might_sleep(); |
| 494 | |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 495 | dev_dbg(info->device, "%s:\n", __func__); |
| 496 | dev_dbg(info->device, " * resolution: %ux%u (%ux%u virtual)\n", |
| 497 | info->var.xres, info->var.yres, |
| 498 | info->var.xres_virtual, info->var.yres_virtual); |
| 499 | |
Haavard Skinnemoen | 3aa04f1 | 2008-09-13 02:33:23 -0700 | [diff] [blame] | 500 | atmel_lcdfb_stop_nowait(sinfo); |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 501 | |
Nicolas Ferre | 250a269 | 2007-07-21 04:37:59 -0700 | [diff] [blame] | 502 | if (info->var.bits_per_pixel == 1) |
| 503 | info->fix.visual = FB_VISUAL_MONO01; |
| 504 | else if (info->var.bits_per_pixel <= 8) |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 505 | info->fix.visual = FB_VISUAL_PSEUDOCOLOR; |
| 506 | else |
| 507 | info->fix.visual = FB_VISUAL_TRUECOLOR; |
| 508 | |
Nicolas Ferre | 250a269 | 2007-07-21 04:37:59 -0700 | [diff] [blame] | 509 | bits_per_line = info->var.xres_virtual * info->var.bits_per_pixel; |
| 510 | info->fix.line_length = DIV_ROUND_UP(bits_per_line, 8); |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 511 | |
| 512 | /* Re-initialize the DMA engine... */ |
| 513 | dev_dbg(info->device, " * update DMA engine\n"); |
| 514 | atmel_lcdfb_update_dma(info, &info->var); |
| 515 | |
| 516 | /* ...set frame size and burst length = 8 words (?) */ |
| 517 | value = (info->var.yres * info->var.xres * info->var.bits_per_pixel) / 32; |
| 518 | value |= ((ATMEL_LCDC_DMA_BURST_LEN - 1) << ATMEL_LCDC_BLENGTH_OFFSET); |
| 519 | lcdc_writel(sinfo, ATMEL_LCDC_DMAFRMCFG, value); |
| 520 | |
| 521 | /* Now, the LCDC core... */ |
| 522 | |
| 523 | /* Set pixel clock */ |
Nicolas Ferre | 431861c | 2009-11-11 14:26:35 -0800 | [diff] [blame] | 524 | if (cpu_is_at91sam9g45() && !cpu_is_at91sam9g45es()) |
| 525 | pix_factor = 1; |
| 526 | |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 527 | clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000; |
| 528 | |
Nicolas Ferre | 250a269 | 2007-07-21 04:37:59 -0700 | [diff] [blame] | 529 | value = DIV_ROUND_UP(clk_value_khz, PICOS2KHZ(info->var.pixclock)); |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 530 | |
Nicolas Ferre | 431861c | 2009-11-11 14:26:35 -0800 | [diff] [blame] | 531 | if (value < pix_factor) { |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 532 | dev_notice(info->device, "Bypassing pixel clock divider\n"); |
| 533 | lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1, ATMEL_LCDC_BYPASS); |
Nicolas Ferre | 250a269 | 2007-07-21 04:37:59 -0700 | [diff] [blame] | 534 | } else { |
Nicolas Ferre | 431861c | 2009-11-11 14:26:35 -0800 | [diff] [blame] | 535 | value = (value / pix_factor) - 1; |
Nicolas Ferre | baf6332 | 2008-05-12 14:02:25 -0700 | [diff] [blame] | 536 | dev_dbg(info->device, " * programming CLKVAL = 0x%08lx\n", |
| 537 | value); |
| 538 | lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1, |
| 539 | value << ATMEL_LCDC_CLKVAL_OFFSET); |
Nicolas Ferre | 431861c | 2009-11-11 14:26:35 -0800 | [diff] [blame] | 540 | info->var.pixclock = |
| 541 | KHZ2PICOS(clk_value_khz / (pix_factor * (value + 1))); |
Nicolas Ferre | 250a269 | 2007-07-21 04:37:59 -0700 | [diff] [blame] | 542 | dev_dbg(info->device, " updated pixclk: %lu KHz\n", |
| 543 | PICOS2KHZ(info->var.pixclock)); |
| 544 | } |
| 545 | |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 546 | |
| 547 | /* Initialize control register 2 */ |
| 548 | value = sinfo->default_lcdcon2; |
| 549 | |
| 550 | if (!(info->var.sync & FB_SYNC_HOR_HIGH_ACT)) |
| 551 | value |= ATMEL_LCDC_INVLINE_INVERTED; |
| 552 | if (!(info->var.sync & FB_SYNC_VERT_HIGH_ACT)) |
| 553 | value |= ATMEL_LCDC_INVFRAME_INVERTED; |
| 554 | |
| 555 | switch (info->var.bits_per_pixel) { |
| 556 | case 1: value |= ATMEL_LCDC_PIXELSIZE_1; break; |
| 557 | case 2: value |= ATMEL_LCDC_PIXELSIZE_2; break; |
| 558 | case 4: value |= ATMEL_LCDC_PIXELSIZE_4; break; |
| 559 | case 8: value |= ATMEL_LCDC_PIXELSIZE_8; break; |
| 560 | case 15: /* fall through */ |
| 561 | case 16: value |= ATMEL_LCDC_PIXELSIZE_16; break; |
| 562 | case 24: value |= ATMEL_LCDC_PIXELSIZE_24; break; |
| 563 | case 32: value |= ATMEL_LCDC_PIXELSIZE_32; break; |
| 564 | default: BUG(); break; |
| 565 | } |
| 566 | dev_dbg(info->device, " * LCDCON2 = %08lx\n", value); |
| 567 | lcdc_writel(sinfo, ATMEL_LCDC_LCDCON2, value); |
| 568 | |
| 569 | /* Vertical timing */ |
| 570 | value = (info->var.vsync_len - 1) << ATMEL_LCDC_VPW_OFFSET; |
| 571 | value |= info->var.upper_margin << ATMEL_LCDC_VBP_OFFSET; |
| 572 | value |= info->var.lower_margin; |
| 573 | dev_dbg(info->device, " * LCDTIM1 = %08lx\n", value); |
| 574 | lcdc_writel(sinfo, ATMEL_LCDC_TIM1, value); |
| 575 | |
| 576 | /* Horizontal timing */ |
| 577 | value = (info->var.right_margin - 1) << ATMEL_LCDC_HFP_OFFSET; |
| 578 | value |= (info->var.hsync_len - 1) << ATMEL_LCDC_HPW_OFFSET; |
| 579 | value |= (info->var.left_margin - 1); |
| 580 | dev_dbg(info->device, " * LCDTIM2 = %08lx\n", value); |
| 581 | lcdc_writel(sinfo, ATMEL_LCDC_TIM2, value); |
| 582 | |
Nicolas Ferre | 250a269 | 2007-07-21 04:37:59 -0700 | [diff] [blame] | 583 | /* Horizontal value (aka line size) */ |
| 584 | hozval_linesz = compute_hozval(info->var.xres, |
| 585 | lcdc_readl(sinfo, ATMEL_LCDC_LCDCON2)); |
| 586 | |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 587 | /* Display size */ |
Nicolas Ferre | 250a269 | 2007-07-21 04:37:59 -0700 | [diff] [blame] | 588 | value = (hozval_linesz - 1) << ATMEL_LCDC_HOZVAL_OFFSET; |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 589 | value |= info->var.yres - 1; |
Nicolas Ferre | 250a269 | 2007-07-21 04:37:59 -0700 | [diff] [blame] | 590 | dev_dbg(info->device, " * LCDFRMCFG = %08lx\n", value); |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 591 | lcdc_writel(sinfo, ATMEL_LCDC_LCDFRMCFG, value); |
| 592 | |
| 593 | /* FIFO Threshold: Use formula from data sheet */ |
| 594 | value = ATMEL_LCDC_FIFO_SIZE - (2 * ATMEL_LCDC_DMA_BURST_LEN + 3); |
| 595 | lcdc_writel(sinfo, ATMEL_LCDC_FIFO, value); |
| 596 | |
| 597 | /* Toggle LCD_MODE every frame */ |
| 598 | lcdc_writel(sinfo, ATMEL_LCDC_MVAL, 0); |
| 599 | |
| 600 | /* Disable all interrupts */ |
| 601 | lcdc_writel(sinfo, ATMEL_LCDC_IDR, ~0UL); |
Nicolas Ferre | d22579b | 2008-07-23 21:31:20 -0700 | [diff] [blame] | 602 | /* Enable FIFO & DMA errors */ |
| 603 | lcdc_writel(sinfo, ATMEL_LCDC_IER, ATMEL_LCDC_UFLWI | ATMEL_LCDC_OWRI | ATMEL_LCDC_MERI); |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 604 | |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 605 | /* ...wait for DMA engine to become idle... */ |
| 606 | while (lcdc_readl(sinfo, ATMEL_LCDC_DMACON) & ATMEL_LCDC_DMABUSY) |
| 607 | msleep(10); |
| 608 | |
Haavard Skinnemoen | 3aa04f1 | 2008-09-13 02:33:23 -0700 | [diff] [blame] | 609 | atmel_lcdfb_start(sinfo); |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 610 | |
| 611 | dev_dbg(info->device, " * DONE\n"); |
| 612 | |
| 613 | return 0; |
| 614 | } |
| 615 | |
| 616 | static inline unsigned int chan_to_field(unsigned int chan, const struct fb_bitfield *bf) |
| 617 | { |
| 618 | chan &= 0xffff; |
| 619 | chan >>= 16 - bf->length; |
| 620 | return chan << bf->offset; |
| 621 | } |
| 622 | |
| 623 | /** |
| 624 | * atmel_lcdfb_setcolreg - Optional function. Sets a color register. |
| 625 | * @regno: Which register in the CLUT we are programming |
| 626 | * @red: The red value which can be up to 16 bits wide |
| 627 | * @green: The green value which can be up to 16 bits wide |
| 628 | * @blue: The blue value which can be up to 16 bits wide. |
| 629 | * @transp: If supported the alpha value which can be up to 16 bits wide. |
| 630 | * @info: frame buffer info structure |
| 631 | * |
| 632 | * Set a single color register. The values supplied have a 16 bit |
| 633 | * magnitude which needs to be scaled in this function for the hardware. |
| 634 | * Things to take into consideration are how many color registers, if |
| 635 | * any, are supported with the current color visual. With truecolor mode |
| 636 | * no color palettes are supported. Here a psuedo palette is created |
| 637 | * which we store the value in pseudo_palette in struct fb_info. For |
| 638 | * pseudocolor mode we have a limited color palette. To deal with this |
| 639 | * we can program what color is displayed for a particular pixel value. |
| 640 | * DirectColor is similar in that we can program each color field. If |
| 641 | * we have a static colormap we don't need to implement this function. |
| 642 | * |
| 643 | * Returns negative errno on error, or zero on success. In an |
| 644 | * ideal world, this would have been the case, but as it turns |
| 645 | * out, the other drivers return 1 on failure, so that's what |
| 646 | * we're going to do. |
| 647 | */ |
| 648 | static int atmel_lcdfb_setcolreg(unsigned int regno, unsigned int red, |
| 649 | unsigned int green, unsigned int blue, |
| 650 | unsigned int transp, struct fb_info *info) |
| 651 | { |
| 652 | struct atmel_lcdfb_info *sinfo = info->par; |
| 653 | unsigned int val; |
| 654 | u32 *pal; |
| 655 | int ret = 1; |
| 656 | |
| 657 | if (info->var.grayscale) |
| 658 | red = green = blue = (19595 * red + 38470 * green |
| 659 | + 7471 * blue) >> 16; |
| 660 | |
| 661 | switch (info->fix.visual) { |
| 662 | case FB_VISUAL_TRUECOLOR: |
| 663 | if (regno < 16) { |
| 664 | pal = info->pseudo_palette; |
| 665 | |
| 666 | val = chan_to_field(red, &info->var.red); |
| 667 | val |= chan_to_field(green, &info->var.green); |
| 668 | val |= chan_to_field(blue, &info->var.blue); |
| 669 | |
| 670 | pal[regno] = val; |
| 671 | ret = 0; |
| 672 | } |
| 673 | break; |
| 674 | |
| 675 | case FB_VISUAL_PSEUDOCOLOR: |
| 676 | if (regno < 256) { |
| 677 | val = ((red >> 11) & 0x001f); |
| 678 | val |= ((green >> 6) & 0x03e0); |
| 679 | val |= ((blue >> 1) & 0x7c00); |
| 680 | |
| 681 | /* |
| 682 | * TODO: intensity bit. Maybe something like |
| 683 | * ~(red[10] ^ green[10] ^ blue[10]) & 1 |
| 684 | */ |
| 685 | |
| 686 | lcdc_writel(sinfo, ATMEL_LCDC_LUT(regno), val); |
| 687 | ret = 0; |
| 688 | } |
| 689 | break; |
Nicolas Ferre | 250a269 | 2007-07-21 04:37:59 -0700 | [diff] [blame] | 690 | |
| 691 | case FB_VISUAL_MONO01: |
| 692 | if (regno < 2) { |
| 693 | val = (regno == 0) ? 0x00 : 0x1F; |
| 694 | lcdc_writel(sinfo, ATMEL_LCDC_LUT(regno), val); |
| 695 | ret = 0; |
| 696 | } |
| 697 | break; |
| 698 | |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 699 | } |
| 700 | |
| 701 | return ret; |
| 702 | } |
| 703 | |
| 704 | static int atmel_lcdfb_pan_display(struct fb_var_screeninfo *var, |
| 705 | struct fb_info *info) |
| 706 | { |
| 707 | dev_dbg(info->device, "%s\n", __func__); |
| 708 | |
| 709 | atmel_lcdfb_update_dma(info, var); |
| 710 | |
| 711 | return 0; |
| 712 | } |
| 713 | |
| 714 | static struct fb_ops atmel_lcdfb_ops = { |
| 715 | .owner = THIS_MODULE, |
| 716 | .fb_check_var = atmel_lcdfb_check_var, |
| 717 | .fb_set_par = atmel_lcdfb_set_par, |
| 718 | .fb_setcolreg = atmel_lcdfb_setcolreg, |
| 719 | .fb_pan_display = atmel_lcdfb_pan_display, |
| 720 | .fb_fillrect = cfb_fillrect, |
| 721 | .fb_copyarea = cfb_copyarea, |
| 722 | .fb_imageblit = cfb_imageblit, |
| 723 | }; |
| 724 | |
| 725 | static irqreturn_t atmel_lcdfb_interrupt(int irq, void *dev_id) |
| 726 | { |
| 727 | struct fb_info *info = dev_id; |
| 728 | struct atmel_lcdfb_info *sinfo = info->par; |
| 729 | u32 status; |
| 730 | |
| 731 | status = lcdc_readl(sinfo, ATMEL_LCDC_ISR); |
Nicolas Ferre | d22579b | 2008-07-23 21:31:20 -0700 | [diff] [blame] | 732 | if (status & ATMEL_LCDC_UFLWI) { |
| 733 | dev_warn(info->device, "FIFO underflow %#x\n", status); |
| 734 | /* reset DMA and FIFO to avoid screen shifting */ |
| 735 | schedule_work(&sinfo->task); |
| 736 | } |
| 737 | lcdc_writel(sinfo, ATMEL_LCDC_ICR, status); |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 738 | return IRQ_HANDLED; |
| 739 | } |
| 740 | |
Nicolas Ferre | d22579b | 2008-07-23 21:31:20 -0700 | [diff] [blame] | 741 | /* |
| 742 | * LCD controller task (to reset the LCD) |
| 743 | */ |
| 744 | static void atmel_lcdfb_task(struct work_struct *work) |
| 745 | { |
| 746 | struct atmel_lcdfb_info *sinfo = |
| 747 | container_of(work, struct atmel_lcdfb_info, task); |
| 748 | |
| 749 | atmel_lcdfb_reset(sinfo); |
| 750 | } |
| 751 | |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 752 | static int __init atmel_lcdfb_init_fbinfo(struct atmel_lcdfb_info *sinfo) |
| 753 | { |
| 754 | struct fb_info *info = sinfo->info; |
| 755 | int ret = 0; |
| 756 | |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 757 | info->var.activate |= FB_ACTIVATE_FORCE | FB_ACTIVATE_NOW; |
| 758 | |
| 759 | dev_info(info->device, |
| 760 | "%luKiB frame buffer at %08lx (mapped at %p)\n", |
| 761 | (unsigned long)info->fix.smem_len / 1024, |
| 762 | (unsigned long)info->fix.smem_start, |
| 763 | info->screen_base); |
| 764 | |
| 765 | /* Allocate colormap */ |
| 766 | ret = fb_alloc_cmap(&info->cmap, 256, 0); |
| 767 | if (ret < 0) |
| 768 | dev_err(info->device, "Alloc color map failed\n"); |
| 769 | |
| 770 | return ret; |
| 771 | } |
| 772 | |
| 773 | static void atmel_lcdfb_start_clock(struct atmel_lcdfb_info *sinfo) |
| 774 | { |
| 775 | if (sinfo->bus_clk) |
| 776 | clk_enable(sinfo->bus_clk); |
| 777 | clk_enable(sinfo->lcdc_clk); |
| 778 | } |
| 779 | |
| 780 | static void atmel_lcdfb_stop_clock(struct atmel_lcdfb_info *sinfo) |
| 781 | { |
| 782 | if (sinfo->bus_clk) |
| 783 | clk_disable(sinfo->bus_clk); |
| 784 | clk_disable(sinfo->lcdc_clk); |
| 785 | } |
| 786 | |
| 787 | |
| 788 | static int __init atmel_lcdfb_probe(struct platform_device *pdev) |
| 789 | { |
| 790 | struct device *dev = &pdev->dev; |
| 791 | struct fb_info *info; |
| 792 | struct atmel_lcdfb_info *sinfo; |
| 793 | struct atmel_lcdfb_info *pdata_sinfo; |
Nicolas Ferre | 968910b | 2008-07-23 21:31:34 -0700 | [diff] [blame] | 794 | struct fb_videomode fbmode; |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 795 | struct resource *regs = NULL; |
| 796 | struct resource *map = NULL; |
| 797 | int ret; |
| 798 | |
| 799 | dev_dbg(dev, "%s BEGIN\n", __func__); |
| 800 | |
| 801 | ret = -ENOMEM; |
| 802 | info = framebuffer_alloc(sizeof(struct atmel_lcdfb_info), dev); |
| 803 | if (!info) { |
| 804 | dev_err(dev, "cannot allocate memory\n"); |
| 805 | goto out; |
| 806 | } |
| 807 | |
| 808 | sinfo = info->par; |
| 809 | |
| 810 | if (dev->platform_data) { |
| 811 | pdata_sinfo = (struct atmel_lcdfb_info *)dev->platform_data; |
| 812 | sinfo->default_bpp = pdata_sinfo->default_bpp; |
| 813 | sinfo->default_dmacon = pdata_sinfo->default_dmacon; |
| 814 | sinfo->default_lcdcon2 = pdata_sinfo->default_lcdcon2; |
| 815 | sinfo->default_monspecs = pdata_sinfo->default_monspecs; |
| 816 | sinfo->atmel_lcdfb_power_control = pdata_sinfo->atmel_lcdfb_power_control; |
| 817 | sinfo->guard_time = pdata_sinfo->guard_time; |
Haavard Skinnemoen | ea757ac | 2008-08-12 15:08:57 -0700 | [diff] [blame] | 818 | sinfo->smem_len = pdata_sinfo->smem_len; |
David Brownell | a9a84c3 | 2008-02-06 01:39:26 -0800 | [diff] [blame] | 819 | sinfo->lcdcon_is_backlight = pdata_sinfo->lcdcon_is_backlight; |
Nicolas Ferre | fd08580 | 2008-04-28 02:15:21 -0700 | [diff] [blame] | 820 | sinfo->lcd_wiring_mode = pdata_sinfo->lcd_wiring_mode; |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 821 | } else { |
| 822 | dev_err(dev, "cannot get default configuration\n"); |
| 823 | goto free_info; |
| 824 | } |
| 825 | sinfo->info = info; |
| 826 | sinfo->pdev = pdev; |
| 827 | |
| 828 | strcpy(info->fix.id, sinfo->pdev->name); |
| 829 | info->flags = ATMEL_LCDFB_FBINFO_DEFAULT; |
| 830 | info->pseudo_palette = sinfo->pseudo_palette; |
| 831 | info->fbops = &atmel_lcdfb_ops; |
| 832 | |
| 833 | memcpy(&info->monspecs, sinfo->default_monspecs, sizeof(info->monspecs)); |
| 834 | info->fix = atmel_lcdfb_fix; |
| 835 | |
| 836 | /* Enable LCDC Clocks */ |
Nicolas Ferre | 915190f | 2009-07-21 11:31:29 +0100 | [diff] [blame] | 837 | if (cpu_is_at91sam9261() || cpu_is_at91sam9g10() |
| 838 | || cpu_is_at32ap7000()) { |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 839 | sinfo->bus_clk = clk_get(dev, "hck1"); |
| 840 | if (IS_ERR(sinfo->bus_clk)) { |
| 841 | ret = PTR_ERR(sinfo->bus_clk); |
| 842 | goto free_info; |
| 843 | } |
| 844 | } |
| 845 | sinfo->lcdc_clk = clk_get(dev, "lcdc_clk"); |
| 846 | if (IS_ERR(sinfo->lcdc_clk)) { |
| 847 | ret = PTR_ERR(sinfo->lcdc_clk); |
| 848 | goto put_bus_clk; |
| 849 | } |
| 850 | atmel_lcdfb_start_clock(sinfo); |
| 851 | |
| 852 | ret = fb_find_mode(&info->var, info, NULL, info->monspecs.modedb, |
| 853 | info->monspecs.modedb_len, info->monspecs.modedb, |
| 854 | sinfo->default_bpp); |
| 855 | if (!ret) { |
| 856 | dev_err(dev, "no suitable video mode found\n"); |
| 857 | goto stop_clk; |
| 858 | } |
| 859 | |
| 860 | |
| 861 | regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 862 | if (!regs) { |
| 863 | dev_err(dev, "resources unusable\n"); |
| 864 | ret = -ENXIO; |
| 865 | goto stop_clk; |
| 866 | } |
| 867 | |
| 868 | sinfo->irq_base = platform_get_irq(pdev, 0); |
| 869 | if (sinfo->irq_base < 0) { |
| 870 | dev_err(dev, "unable to get irq\n"); |
| 871 | ret = sinfo->irq_base; |
| 872 | goto stop_clk; |
| 873 | } |
| 874 | |
| 875 | /* Initialize video memory */ |
| 876 | map = platform_get_resource(pdev, IORESOURCE_MEM, 1); |
| 877 | if (map) { |
| 878 | /* use a pre-allocated memory buffer */ |
| 879 | info->fix.smem_start = map->start; |
| 880 | info->fix.smem_len = map->end - map->start + 1; |
| 881 | if (!request_mem_region(info->fix.smem_start, |
| 882 | info->fix.smem_len, pdev->name)) { |
| 883 | ret = -EBUSY; |
| 884 | goto stop_clk; |
| 885 | } |
| 886 | |
| 887 | info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len); |
| 888 | if (!info->screen_base) |
| 889 | goto release_intmem; |
Haavard Skinnemoen | 01d3a5e | 2008-04-28 02:15:19 -0700 | [diff] [blame] | 890 | |
| 891 | /* |
| 892 | * Don't clear the framebuffer -- someone may have set |
| 893 | * up a splash image. |
| 894 | */ |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 895 | } else { |
| 896 | /* alocate memory buffer */ |
| 897 | ret = atmel_lcdfb_alloc_video_memory(sinfo); |
| 898 | if (ret < 0) { |
| 899 | dev_err(dev, "cannot allocate framebuffer: %d\n", ret); |
| 900 | goto stop_clk; |
| 901 | } |
| 902 | } |
| 903 | |
| 904 | /* LCDC registers */ |
| 905 | info->fix.mmio_start = regs->start; |
| 906 | info->fix.mmio_len = regs->end - regs->start + 1; |
| 907 | |
| 908 | if (!request_mem_region(info->fix.mmio_start, |
| 909 | info->fix.mmio_len, pdev->name)) { |
| 910 | ret = -EBUSY; |
| 911 | goto free_fb; |
| 912 | } |
| 913 | |
| 914 | sinfo->mmio = ioremap(info->fix.mmio_start, info->fix.mmio_len); |
| 915 | if (!sinfo->mmio) { |
| 916 | dev_err(dev, "cannot map LCDC registers\n"); |
| 917 | goto release_mem; |
| 918 | } |
| 919 | |
David Brownell | a9a84c3 | 2008-02-06 01:39:26 -0800 | [diff] [blame] | 920 | /* Initialize PWM for contrast or backlight ("off") */ |
| 921 | init_contrast(sinfo); |
| 922 | |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 923 | /* interrupt */ |
| 924 | ret = request_irq(sinfo->irq_base, atmel_lcdfb_interrupt, 0, pdev->name, info); |
| 925 | if (ret) { |
| 926 | dev_err(dev, "request_irq failed: %d\n", ret); |
| 927 | goto unmap_mmio; |
| 928 | } |
| 929 | |
Nicolas Ferre | d22579b | 2008-07-23 21:31:20 -0700 | [diff] [blame] | 930 | /* Some operations on the LCDC might sleep and |
| 931 | * require a preemptible task context */ |
| 932 | INIT_WORK(&sinfo->task, atmel_lcdfb_task); |
| 933 | |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 934 | ret = atmel_lcdfb_init_fbinfo(sinfo); |
| 935 | if (ret < 0) { |
| 936 | dev_err(dev, "init fbinfo failed: %d\n", ret); |
| 937 | goto unregister_irqs; |
| 938 | } |
| 939 | |
| 940 | /* |
| 941 | * This makes sure that our colour bitfield |
| 942 | * descriptors are correctly initialised. |
| 943 | */ |
| 944 | atmel_lcdfb_check_var(&info->var, info); |
| 945 | |
| 946 | ret = fb_set_var(info, &info->var); |
| 947 | if (ret) { |
| 948 | dev_warn(dev, "unable to set display parameters\n"); |
| 949 | goto free_cmap; |
| 950 | } |
| 951 | |
| 952 | dev_set_drvdata(dev, info); |
| 953 | |
| 954 | /* |
| 955 | * Tell the world that we're ready to go |
| 956 | */ |
| 957 | ret = register_framebuffer(info); |
| 958 | if (ret < 0) { |
| 959 | dev_err(dev, "failed to register framebuffer device: %d\n", ret); |
Stanislaw Gruszka | 34a35bd | 2008-09-05 14:00:22 -0700 | [diff] [blame] | 960 | goto reset_drvdata; |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 961 | } |
| 962 | |
Nicolas Ferre | 968910b | 2008-07-23 21:31:34 -0700 | [diff] [blame] | 963 | /* add selected videomode to modelist */ |
| 964 | fb_var_to_videomode(&fbmode, &info->var); |
| 965 | fb_add_videomode(&fbmode, &info->modelist); |
| 966 | |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 967 | /* Power up the LCDC screen */ |
| 968 | if (sinfo->atmel_lcdfb_power_control) |
| 969 | sinfo->atmel_lcdfb_power_control(1); |
| 970 | |
Claudio Scordino | 93f6ced | 2009-10-09 12:20:21 +0200 | [diff] [blame] | 971 | dev_info(dev, "fb%d: Atmel LCDC at 0x%08lx (mapped at %p), irq %d\n", |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 972 | info->node, info->fix.mmio_start, sinfo->mmio, sinfo->irq_base); |
| 973 | |
| 974 | return 0; |
| 975 | |
Stanislaw Gruszka | 34a35bd | 2008-09-05 14:00:22 -0700 | [diff] [blame] | 976 | reset_drvdata: |
| 977 | dev_set_drvdata(dev, NULL); |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 978 | free_cmap: |
| 979 | fb_dealloc_cmap(&info->cmap); |
| 980 | unregister_irqs: |
Nicolas Ferre | d22579b | 2008-07-23 21:31:20 -0700 | [diff] [blame] | 981 | cancel_work_sync(&sinfo->task); |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 982 | free_irq(sinfo->irq_base, info); |
| 983 | unmap_mmio: |
David Brownell | a9a84c3 | 2008-02-06 01:39:26 -0800 | [diff] [blame] | 984 | exit_backlight(sinfo); |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 985 | iounmap(sinfo->mmio); |
| 986 | release_mem: |
| 987 | release_mem_region(info->fix.mmio_start, info->fix.mmio_len); |
| 988 | free_fb: |
| 989 | if (map) |
| 990 | iounmap(info->screen_base); |
| 991 | else |
| 992 | atmel_lcdfb_free_video_memory(sinfo); |
| 993 | |
| 994 | release_intmem: |
| 995 | if (map) |
| 996 | release_mem_region(info->fix.smem_start, info->fix.smem_len); |
| 997 | stop_clk: |
| 998 | atmel_lcdfb_stop_clock(sinfo); |
| 999 | clk_put(sinfo->lcdc_clk); |
| 1000 | put_bus_clk: |
| 1001 | if (sinfo->bus_clk) |
| 1002 | clk_put(sinfo->bus_clk); |
| 1003 | free_info: |
| 1004 | framebuffer_release(info); |
| 1005 | out: |
| 1006 | dev_dbg(dev, "%s FAILED\n", __func__); |
| 1007 | return ret; |
| 1008 | } |
| 1009 | |
| 1010 | static int __exit atmel_lcdfb_remove(struct platform_device *pdev) |
| 1011 | { |
| 1012 | struct device *dev = &pdev->dev; |
| 1013 | struct fb_info *info = dev_get_drvdata(dev); |
Stanislaw Gruszka | 34a35bd | 2008-09-05 14:00:22 -0700 | [diff] [blame] | 1014 | struct atmel_lcdfb_info *sinfo; |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 1015 | |
Stanislaw Gruszka | 34a35bd | 2008-09-05 14:00:22 -0700 | [diff] [blame] | 1016 | if (!info || !info->par) |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 1017 | return 0; |
Stanislaw Gruszka | 34a35bd | 2008-09-05 14:00:22 -0700 | [diff] [blame] | 1018 | sinfo = info->par; |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 1019 | |
Nicolas Ferre | d22579b | 2008-07-23 21:31:20 -0700 | [diff] [blame] | 1020 | cancel_work_sync(&sinfo->task); |
David Brownell | a9a84c3 | 2008-02-06 01:39:26 -0800 | [diff] [blame] | 1021 | exit_backlight(sinfo); |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 1022 | if (sinfo->atmel_lcdfb_power_control) |
| 1023 | sinfo->atmel_lcdfb_power_control(0); |
| 1024 | unregister_framebuffer(info); |
| 1025 | atmel_lcdfb_stop_clock(sinfo); |
| 1026 | clk_put(sinfo->lcdc_clk); |
| 1027 | if (sinfo->bus_clk) |
| 1028 | clk_put(sinfo->bus_clk); |
| 1029 | fb_dealloc_cmap(&info->cmap); |
| 1030 | free_irq(sinfo->irq_base, info); |
| 1031 | iounmap(sinfo->mmio); |
| 1032 | release_mem_region(info->fix.mmio_start, info->fix.mmio_len); |
| 1033 | if (platform_get_resource(pdev, IORESOURCE_MEM, 1)) { |
| 1034 | iounmap(info->screen_base); |
| 1035 | release_mem_region(info->fix.smem_start, info->fix.smem_len); |
| 1036 | } else { |
| 1037 | atmel_lcdfb_free_video_memory(sinfo); |
| 1038 | } |
| 1039 | |
| 1040 | dev_set_drvdata(dev, NULL); |
| 1041 | framebuffer_release(info); |
| 1042 | |
| 1043 | return 0; |
| 1044 | } |
| 1045 | |
David Brownell | cf19a37 | 2008-04-28 02:15:20 -0700 | [diff] [blame] | 1046 | #ifdef CONFIG_PM |
| 1047 | |
| 1048 | static int atmel_lcdfb_suspend(struct platform_device *pdev, pm_message_t mesg) |
| 1049 | { |
| 1050 | struct fb_info *info = platform_get_drvdata(pdev); |
| 1051 | struct atmel_lcdfb_info *sinfo = info->par; |
| 1052 | |
Haavard Skinnemoen | 3aa04f1 | 2008-09-13 02:33:23 -0700 | [diff] [blame] | 1053 | /* |
| 1054 | * We don't want to handle interrupts while the clock is |
| 1055 | * stopped. It may take forever. |
| 1056 | */ |
| 1057 | lcdc_writel(sinfo, ATMEL_LCDC_IDR, ~0UL); |
| 1058 | |
David Brownell | cf19a37 | 2008-04-28 02:15:20 -0700 | [diff] [blame] | 1059 | sinfo->saved_lcdcon = lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL); |
| 1060 | lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, 0); |
| 1061 | if (sinfo->atmel_lcdfb_power_control) |
| 1062 | sinfo->atmel_lcdfb_power_control(0); |
Haavard Skinnemoen | 3aa04f1 | 2008-09-13 02:33:23 -0700 | [diff] [blame] | 1063 | |
| 1064 | atmel_lcdfb_stop(sinfo); |
David Brownell | cf19a37 | 2008-04-28 02:15:20 -0700 | [diff] [blame] | 1065 | atmel_lcdfb_stop_clock(sinfo); |
Haavard Skinnemoen | 3aa04f1 | 2008-09-13 02:33:23 -0700 | [diff] [blame] | 1066 | |
David Brownell | cf19a37 | 2008-04-28 02:15:20 -0700 | [diff] [blame] | 1067 | return 0; |
| 1068 | } |
| 1069 | |
| 1070 | static int atmel_lcdfb_resume(struct platform_device *pdev) |
| 1071 | { |
| 1072 | struct fb_info *info = platform_get_drvdata(pdev); |
| 1073 | struct atmel_lcdfb_info *sinfo = info->par; |
| 1074 | |
| 1075 | atmel_lcdfb_start_clock(sinfo); |
Haavard Skinnemoen | 3aa04f1 | 2008-09-13 02:33:23 -0700 | [diff] [blame] | 1076 | atmel_lcdfb_start(sinfo); |
David Brownell | cf19a37 | 2008-04-28 02:15:20 -0700 | [diff] [blame] | 1077 | if (sinfo->atmel_lcdfb_power_control) |
| 1078 | sinfo->atmel_lcdfb_power_control(1); |
| 1079 | lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, sinfo->saved_lcdcon); |
Haavard Skinnemoen | 3aa04f1 | 2008-09-13 02:33:23 -0700 | [diff] [blame] | 1080 | |
| 1081 | /* Enable FIFO & DMA errors */ |
| 1082 | lcdc_writel(sinfo, ATMEL_LCDC_IER, ATMEL_LCDC_UFLWI |
| 1083 | | ATMEL_LCDC_OWRI | ATMEL_LCDC_MERI); |
| 1084 | |
David Brownell | cf19a37 | 2008-04-28 02:15:20 -0700 | [diff] [blame] | 1085 | return 0; |
| 1086 | } |
| 1087 | |
| 1088 | #else |
| 1089 | #define atmel_lcdfb_suspend NULL |
| 1090 | #define atmel_lcdfb_resume NULL |
| 1091 | #endif |
| 1092 | |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 1093 | static struct platform_driver atmel_lcdfb_driver = { |
| 1094 | .remove = __exit_p(atmel_lcdfb_remove), |
David Brownell | cf19a37 | 2008-04-28 02:15:20 -0700 | [diff] [blame] | 1095 | .suspend = atmel_lcdfb_suspend, |
| 1096 | .resume = atmel_lcdfb_resume, |
David Brownell | a9a84c3 | 2008-02-06 01:39:26 -0800 | [diff] [blame] | 1097 | |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 1098 | .driver = { |
| 1099 | .name = "atmel_lcdfb", |
| 1100 | .owner = THIS_MODULE, |
| 1101 | }, |
| 1102 | }; |
| 1103 | |
| 1104 | static int __init atmel_lcdfb_init(void) |
| 1105 | { |
| 1106 | return platform_driver_probe(&atmel_lcdfb_driver, atmel_lcdfb_probe); |
| 1107 | } |
| 1108 | |
| 1109 | static void __exit atmel_lcdfb_exit(void) |
| 1110 | { |
| 1111 | platform_driver_unregister(&atmel_lcdfb_driver); |
| 1112 | } |
| 1113 | |
| 1114 | module_init(atmel_lcdfb_init); |
| 1115 | module_exit(atmel_lcdfb_exit); |
| 1116 | |
| 1117 | MODULE_DESCRIPTION("AT91/AT32 LCD Controller framebuffer driver"); |
Nicolas Ferre | 8f4c79c | 2008-01-14 00:55:13 -0800 | [diff] [blame] | 1118 | MODULE_AUTHOR("Nicolas Ferre <nicolas.ferre@atmel.com>"); |
Nicolas Ferre | 1434058 | 2007-05-10 22:23:26 -0700 | [diff] [blame] | 1119 | MODULE_LICENSE("GPL"); |