1 /* 2 * Cirrus Logic CLPS711X FB driver 3 * 4 * Copyright (C) 2014 Alexander Shiyan <shc_work@mail.ru> 5 * Based on driver by Russell King <rmk@arm.linux.org.uk> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 */ 12 13 #include <linux/clk.h> 14 #include <linux/fb.h> 15 #include <linux/io.h> 16 #include <linux/lcd.h> 17 #include <linux/module.h> 18 #include <linux/of.h> 19 #include <linux/platform_device.h> 20 #include <linux/regmap.h> 21 #include <linux/mfd/syscon.h> 22 #include <linux/mfd/syscon/clps711x.h> 23 #include <linux/regulator/consumer.h> 24 #include <video/of_display_timing.h> 25 26 #define CLPS711X_FB_NAME "clps711x-fb" 27 #define CLPS711X_FB_BPP_MAX (4) 28 29 /* Registers relative to LCDCON */ 30 #define CLPS711X_LCDCON (0x0000) 31 # define LCDCON_GSEN BIT(30) 32 # define LCDCON_GSMD BIT(31) 33 #define CLPS711X_PALLSW (0x0280) 34 #define CLPS711X_PALMSW (0x02c0) 35 #define CLPS711X_FBADDR (0x0d40) 36 37 struct clps711x_fb_info { 38 struct clk *clk; 39 void __iomem *base; 40 struct regmap *syscon; 41 resource_size_t buffsize; 42 struct fb_videomode mode; 43 struct regulator *lcd_pwr; 44 u32 ac_prescale; 45 bool cmap_invert; 46 }; 47 48 static int clps711x_fb_setcolreg(u_int regno, u_int red, u_int green, 49 u_int blue, u_int transp, struct fb_info *info) 50 { 51 struct clps711x_fb_info *cfb = info->par; 52 u32 level, mask, shift; 53 54 if (regno >= BIT(info->var.bits_per_pixel)) 55 return -EINVAL; 56 57 shift = 4 * (regno & 7); 58 mask = 0xf << shift; 59 /* gray = 0.30*R + 0.58*G + 0.11*B */ 60 level = (((red * 77 + green * 151 + blue * 28) >> 20) << shift) & mask; 61 if (cfb->cmap_invert) 62 level = 0xf - level; 63 64 regno = (regno < 8) ? CLPS711X_PALLSW : CLPS711X_PALMSW; 65 66 writel((readl(cfb->base + regno) & ~mask) | level, cfb->base + regno); 67 68 return 0; 69 } 70 71 static int clps711x_fb_check_var(struct fb_var_screeninfo *var, 72 struct fb_info *info) 73 { 74 u32 val; 75 76 if (var->bits_per_pixel < 1 || 77 var->bits_per_pixel > CLPS711X_FB_BPP_MAX) 78 return -EINVAL; 79 80 if (!var->pixclock) 81 return -EINVAL; 82 83 val = DIV_ROUND_UP(var->xres, 16) - 1; 84 if (val < 0x01 || val > 0x3f) 85 return -EINVAL; 86 87 val = DIV_ROUND_UP(var->yres * var->xres * var->bits_per_pixel, 128); 88 val--; 89 if (val < 0x001 || val > 0x1fff) 90 return -EINVAL; 91 92 var->transp.msb_right = 0; 93 var->transp.offset = 0; 94 var->transp.length = 0; 95 var->red.msb_right = 0; 96 var->red.offset = 0; 97 var->red.length = var->bits_per_pixel; 98 var->green = var->red; 99 var->blue = var->red; 100 var->grayscale = var->bits_per_pixel > 1; 101 102 return 0; 103 } 104 105 static int clps711x_fb_set_par(struct fb_info *info) 106 { 107 struct clps711x_fb_info *cfb = info->par; 108 resource_size_t size; 109 u32 lcdcon, pps; 110 111 size = (info->var.xres * info->var.yres * info->var.bits_per_pixel) / 8; 112 if (size > cfb->buffsize) 113 return -EINVAL; 114 115 switch (info->var.bits_per_pixel) { 116 case 1: 117 info->fix.visual = FB_VISUAL_MONO01; 118 break; 119 case 2: 120 case 4: 121 info->fix.visual = FB_VISUAL_PSEUDOCOLOR; 122 break; 123 default: 124 return -EINVAL; 125 } 126 127 info->fix.line_length = info->var.xres * info->var.bits_per_pixel / 8; 128 info->fix.smem_len = size; 129 130 lcdcon = (info->var.xres * info->var.yres * 131 info->var.bits_per_pixel) / 128 - 1; 132 lcdcon |= ((info->var.xres / 16) - 1) << 13; 133 lcdcon |= (cfb->ac_prescale & 0x1f) << 25; 134 135 pps = clk_get_rate(cfb->clk) / (PICOS2KHZ(info->var.pixclock) * 1000); 136 if (pps) 137 pps--; 138 lcdcon |= (pps & 0x3f) << 19; 139 140 if (info->var.bits_per_pixel == 4) 141 lcdcon |= LCDCON_GSMD; 142 if (info->var.bits_per_pixel >= 2) 143 lcdcon |= LCDCON_GSEN; 144 145 /* LCDCON must only be changed while the LCD is disabled */ 146 regmap_update_bits(cfb->syscon, SYSCON_OFFSET, SYSCON1_LCDEN, 0); 147 writel(lcdcon, cfb->base + CLPS711X_LCDCON); 148 regmap_update_bits(cfb->syscon, SYSCON_OFFSET, 149 SYSCON1_LCDEN, SYSCON1_LCDEN); 150 151 return 0; 152 } 153 154 static int clps711x_fb_blank(int blank, struct fb_info *info) 155 { 156 /* Return happy */ 157 return 0; 158 } 159 160 static struct fb_ops clps711x_fb_ops = { 161 .owner = THIS_MODULE, 162 .fb_setcolreg = clps711x_fb_setcolreg, 163 .fb_check_var = clps711x_fb_check_var, 164 .fb_set_par = clps711x_fb_set_par, 165 .fb_blank = clps711x_fb_blank, 166 .fb_fillrect = sys_fillrect, 167 .fb_copyarea = sys_copyarea, 168 .fb_imageblit = sys_imageblit, 169 }; 170 171 static int clps711x_lcd_check_fb(struct lcd_device *lcddev, struct fb_info *fi) 172 { 173 struct clps711x_fb_info *cfb = dev_get_drvdata(&lcddev->dev); 174 175 return (!fi || fi->par == cfb) ? 1 : 0; 176 } 177 178 static int clps711x_lcd_get_power(struct lcd_device *lcddev) 179 { 180 struct clps711x_fb_info *cfb = dev_get_drvdata(&lcddev->dev); 181 182 if (!IS_ERR_OR_NULL(cfb->lcd_pwr)) 183 if (!regulator_is_enabled(cfb->lcd_pwr)) 184 return FB_BLANK_NORMAL; 185 186 return FB_BLANK_UNBLANK; 187 } 188 189 static int clps711x_lcd_set_power(struct lcd_device *lcddev, int blank) 190 { 191 struct clps711x_fb_info *cfb = dev_get_drvdata(&lcddev->dev); 192 193 if (!IS_ERR_OR_NULL(cfb->lcd_pwr)) { 194 if (blank == FB_BLANK_UNBLANK) { 195 if (!regulator_is_enabled(cfb->lcd_pwr)) 196 return regulator_enable(cfb->lcd_pwr); 197 } else { 198 if (regulator_is_enabled(cfb->lcd_pwr)) 199 return regulator_disable(cfb->lcd_pwr); 200 } 201 } 202 203 return 0; 204 } 205 206 static struct lcd_ops clps711x_lcd_ops = { 207 .check_fb = clps711x_lcd_check_fb, 208 .get_power = clps711x_lcd_get_power, 209 .set_power = clps711x_lcd_set_power, 210 }; 211 212 static int clps711x_fb_probe(struct platform_device *pdev) 213 { 214 struct device *dev = &pdev->dev; 215 struct device_node *disp, *np = dev->of_node; 216 struct clps711x_fb_info *cfb; 217 struct lcd_device *lcd; 218 struct fb_info *info; 219 struct resource *res; 220 int ret = -ENOENT; 221 u32 val; 222 223 if (fb_get_options(CLPS711X_FB_NAME, NULL)) 224 return -ENODEV; 225 226 info = framebuffer_alloc(sizeof(*cfb), dev); 227 if (!info) 228 return -ENOMEM; 229 230 cfb = info->par; 231 platform_set_drvdata(pdev, info); 232 233 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 234 if (!res) 235 goto out_fb_release; 236 cfb->base = devm_ioremap(dev, res->start, resource_size(res)); 237 if (!cfb->base) { 238 ret = -ENOMEM; 239 goto out_fb_release; 240 } 241 242 info->fix.mmio_start = res->start; 243 info->fix.mmio_len = resource_size(res); 244 245 res = platform_get_resource(pdev, IORESOURCE_MEM, 1); 246 info->screen_base = devm_ioremap_resource(dev, res); 247 if (IS_ERR(info->screen_base)) { 248 ret = PTR_ERR(info->screen_base); 249 goto out_fb_release; 250 } 251 252 /* Physical address should be aligned to 256 MiB */ 253 if (res->start & 0x0fffffff) { 254 ret = -EINVAL; 255 goto out_fb_release; 256 } 257 258 info->apertures = alloc_apertures(1); 259 if (!info->apertures) { 260 ret = -ENOMEM; 261 goto out_fb_release; 262 } 263 264 cfb->buffsize = resource_size(res); 265 info->fix.smem_start = res->start; 266 info->apertures->ranges[0].base = info->fix.smem_start; 267 info->apertures->ranges[0].size = cfb->buffsize; 268 269 cfb->clk = devm_clk_get(dev, NULL); 270 if (IS_ERR(cfb->clk)) { 271 ret = PTR_ERR(cfb->clk); 272 goto out_fb_release; 273 } 274 275 cfb->syscon = 276 syscon_regmap_lookup_by_compatible("cirrus,clps711x-syscon1"); 277 if (IS_ERR(cfb->syscon)) { 278 ret = PTR_ERR(cfb->syscon); 279 goto out_fb_release; 280 } 281 282 disp = of_parse_phandle(np, "display", 0); 283 if (!disp) { 284 dev_err(&pdev->dev, "No display defined\n"); 285 ret = -ENODATA; 286 goto out_fb_release; 287 } 288 289 ret = of_get_fb_videomode(disp, &cfb->mode, OF_USE_NATIVE_MODE); 290 if (ret) 291 goto out_fb_release; 292 293 of_property_read_u32(disp, "ac-prescale", &cfb->ac_prescale); 294 cfb->cmap_invert = of_property_read_bool(disp, "cmap-invert"); 295 296 ret = of_property_read_u32(disp, "bits-per-pixel", 297 &info->var.bits_per_pixel); 298 if (ret) 299 goto out_fb_release; 300 301 /* Force disable LCD on any mismatch */ 302 if (info->fix.smem_start != (readb(cfb->base + CLPS711X_FBADDR) << 28)) 303 regmap_update_bits(cfb->syscon, SYSCON_OFFSET, 304 SYSCON1_LCDEN, 0); 305 306 ret = regmap_read(cfb->syscon, SYSCON_OFFSET, &val); 307 if (ret) 308 goto out_fb_release; 309 310 if (!(val & SYSCON1_LCDEN)) { 311 /* Setup start FB address */ 312 writeb(info->fix.smem_start >> 28, cfb->base + CLPS711X_FBADDR); 313 /* Clean FB memory */ 314 memset_io(info->screen_base, 0, cfb->buffsize); 315 } 316 317 cfb->lcd_pwr = devm_regulator_get(dev, "lcd"); 318 if (PTR_ERR(cfb->lcd_pwr) == -EPROBE_DEFER) { 319 ret = -EPROBE_DEFER; 320 goto out_fb_release; 321 } 322 323 info->fbops = &clps711x_fb_ops; 324 info->flags = FBINFO_DEFAULT; 325 info->var.activate = FB_ACTIVATE_FORCE | FB_ACTIVATE_NOW; 326 info->var.height = -1; 327 info->var.width = -1; 328 info->var.vmode = FB_VMODE_NONINTERLACED; 329 info->fix.type = FB_TYPE_PACKED_PIXELS; 330 info->fix.accel = FB_ACCEL_NONE; 331 strlcpy(info->fix.id, CLPS711X_FB_NAME, sizeof(info->fix.id)); 332 fb_videomode_to_var(&info->var, &cfb->mode); 333 334 ret = fb_alloc_cmap(&info->cmap, BIT(CLPS711X_FB_BPP_MAX), 0); 335 if (ret) 336 goto out_fb_release; 337 338 ret = fb_set_var(info, &info->var); 339 if (ret) 340 goto out_fb_dealloc_cmap; 341 342 ret = register_framebuffer(info); 343 if (ret) 344 goto out_fb_dealloc_cmap; 345 346 lcd = devm_lcd_device_register(dev, "clps711x-lcd", dev, cfb, 347 &clps711x_lcd_ops); 348 if (!IS_ERR(lcd)) 349 return 0; 350 351 ret = PTR_ERR(lcd); 352 unregister_framebuffer(info); 353 354 out_fb_dealloc_cmap: 355 regmap_update_bits(cfb->syscon, SYSCON_OFFSET, SYSCON1_LCDEN, 0); 356 fb_dealloc_cmap(&info->cmap); 357 358 out_fb_release: 359 framebuffer_release(info); 360 361 return ret; 362 } 363 364 static int clps711x_fb_remove(struct platform_device *pdev) 365 { 366 struct fb_info *info = platform_get_drvdata(pdev); 367 struct clps711x_fb_info *cfb = info->par; 368 369 regmap_update_bits(cfb->syscon, SYSCON_OFFSET, SYSCON1_LCDEN, 0); 370 371 unregister_framebuffer(info); 372 fb_dealloc_cmap(&info->cmap); 373 framebuffer_release(info); 374 375 return 0; 376 } 377 378 static const struct of_device_id clps711x_fb_dt_ids[] = { 379 { .compatible = "cirrus,clps711x-fb", }, 380 { } 381 }; 382 MODULE_DEVICE_TABLE(of, clps711x_fb_dt_ids); 383 384 static struct platform_driver clps711x_fb_driver = { 385 .driver = { 386 .name = CLPS711X_FB_NAME, 387 .of_match_table = clps711x_fb_dt_ids, 388 }, 389 .probe = clps711x_fb_probe, 390 .remove = clps711x_fb_remove, 391 }; 392 module_platform_driver(clps711x_fb_driver); 393 394 MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>"); 395 MODULE_DESCRIPTION("Cirrus Logic CLPS711X FB driver"); 396 MODULE_LICENSE("GPL"); 397