1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Cirrus Logic CLPS711X FB driver 4 * 5 * Copyright (C) 2014 Alexander Shiyan <shc_work@mail.ru> 6 * Based on driver by Russell King <rmk@arm.linux.org.uk> 7 */ 8 9 #include <linux/clk.h> 10 #include <linux/fb.h> 11 #include <linux/io.h> 12 #include <linux/lcd.h> 13 #include <linux/module.h> 14 #include <linux/of.h> 15 #include <linux/platform_device.h> 16 #include <linux/regmap.h> 17 #include <linux/mfd/syscon.h> 18 #include <linux/mfd/syscon/clps711x.h> 19 #include <linux/regulator/consumer.h> 20 #include <video/of_display_timing.h> 21 22 #define CLPS711X_FB_NAME "clps711x-fb" 23 #define CLPS711X_FB_BPP_MAX (4) 24 25 /* Registers relative to LCDCON */ 26 #define CLPS711X_LCDCON (0x0000) 27 # define LCDCON_GSEN BIT(30) 28 # define LCDCON_GSMD BIT(31) 29 #define CLPS711X_PALLSW (0x0280) 30 #define CLPS711X_PALMSW (0x02c0) 31 #define CLPS711X_FBADDR (0x0d40) 32 33 struct clps711x_fb_info { 34 struct clk *clk; 35 void __iomem *base; 36 struct regmap *syscon; 37 resource_size_t buffsize; 38 struct fb_videomode mode; 39 struct regulator *lcd_pwr; 40 u32 ac_prescale; 41 bool cmap_invert; 42 }; 43 44 static int clps711x_fb_setcolreg(u_int regno, u_int red, u_int green, 45 u_int blue, u_int transp, struct fb_info *info) 46 { 47 struct clps711x_fb_info *cfb = info->par; 48 u32 level, mask, shift; 49 50 if (regno >= BIT(info->var.bits_per_pixel)) 51 return -EINVAL; 52 53 shift = 4 * (regno & 7); 54 mask = 0xf << shift; 55 /* gray = 0.30*R + 0.58*G + 0.11*B */ 56 level = (((red * 77 + green * 151 + blue * 28) >> 20) << shift) & mask; 57 if (cfb->cmap_invert) 58 level = 0xf - level; 59 60 regno = (regno < 8) ? CLPS711X_PALLSW : CLPS711X_PALMSW; 61 62 writel((readl(cfb->base + regno) & ~mask) | level, cfb->base + regno); 63 64 return 0; 65 } 66 67 static int clps711x_fb_check_var(struct fb_var_screeninfo *var, 68 struct fb_info *info) 69 { 70 u32 val; 71 72 if (var->bits_per_pixel < 1 || 73 var->bits_per_pixel > CLPS711X_FB_BPP_MAX) 74 return -EINVAL; 75 76 if (!var->pixclock) 77 return -EINVAL; 78 79 val = DIV_ROUND_UP(var->xres, 16) - 1; 80 if (val < 0x01 || val > 0x3f) 81 return -EINVAL; 82 83 val = DIV_ROUND_UP(var->yres * var->xres * var->bits_per_pixel, 128); 84 val--; 85 if (val < 0x001 || val > 0x1fff) 86 return -EINVAL; 87 88 var->transp.msb_right = 0; 89 var->transp.offset = 0; 90 var->transp.length = 0; 91 var->red.msb_right = 0; 92 var->red.offset = 0; 93 var->red.length = var->bits_per_pixel; 94 var->green = var->red; 95 var->blue = var->red; 96 var->grayscale = var->bits_per_pixel > 1; 97 98 return 0; 99 } 100 101 static int clps711x_fb_set_par(struct fb_info *info) 102 { 103 struct clps711x_fb_info *cfb = info->par; 104 resource_size_t size; 105 u32 lcdcon, pps; 106 107 size = (info->var.xres * info->var.yres * info->var.bits_per_pixel) / 8; 108 if (size > cfb->buffsize) 109 return -EINVAL; 110 111 switch (info->var.bits_per_pixel) { 112 case 1: 113 info->fix.visual = FB_VISUAL_MONO01; 114 break; 115 case 2: 116 case 4: 117 info->fix.visual = FB_VISUAL_PSEUDOCOLOR; 118 break; 119 default: 120 return -EINVAL; 121 } 122 123 info->fix.line_length = info->var.xres * info->var.bits_per_pixel / 8; 124 info->fix.smem_len = size; 125 126 lcdcon = (info->var.xres * info->var.yres * 127 info->var.bits_per_pixel) / 128 - 1; 128 lcdcon |= ((info->var.xres / 16) - 1) << 13; 129 lcdcon |= (cfb->ac_prescale & 0x1f) << 25; 130 131 pps = clk_get_rate(cfb->clk) / (PICOS2KHZ(info->var.pixclock) * 1000); 132 if (pps) 133 pps--; 134 lcdcon |= (pps & 0x3f) << 19; 135 136 if (info->var.bits_per_pixel == 4) 137 lcdcon |= LCDCON_GSMD; 138 if (info->var.bits_per_pixel >= 2) 139 lcdcon |= LCDCON_GSEN; 140 141 /* LCDCON must only be changed while the LCD is disabled */ 142 regmap_update_bits(cfb->syscon, SYSCON_OFFSET, SYSCON1_LCDEN, 0); 143 writel(lcdcon, cfb->base + CLPS711X_LCDCON); 144 regmap_update_bits(cfb->syscon, SYSCON_OFFSET, 145 SYSCON1_LCDEN, SYSCON1_LCDEN); 146 147 return 0; 148 } 149 150 static int clps711x_fb_blank(int blank, struct fb_info *info) 151 { 152 /* Return happy */ 153 return 0; 154 } 155 156 static const struct fb_ops clps711x_fb_ops = { 157 .owner = THIS_MODULE, 158 FB_DEFAULT_IOMEM_OPS, 159 .fb_setcolreg = clps711x_fb_setcolreg, 160 .fb_check_var = clps711x_fb_check_var, 161 .fb_set_par = clps711x_fb_set_par, 162 .fb_blank = clps711x_fb_blank, 163 }; 164 165 static int clps711x_lcd_get_power(struct lcd_device *lcddev) 166 { 167 struct clps711x_fb_info *cfb = dev_get_drvdata(&lcddev->dev); 168 169 if (!IS_ERR_OR_NULL(cfb->lcd_pwr)) 170 if (!regulator_is_enabled(cfb->lcd_pwr)) 171 return LCD_POWER_REDUCED; 172 173 return LCD_POWER_ON; 174 } 175 176 static int clps711x_lcd_set_power(struct lcd_device *lcddev, int blank) 177 { 178 struct clps711x_fb_info *cfb = dev_get_drvdata(&lcddev->dev); 179 180 if (!IS_ERR_OR_NULL(cfb->lcd_pwr)) { 181 if (blank == LCD_POWER_ON) { 182 if (!regulator_is_enabled(cfb->lcd_pwr)) 183 return regulator_enable(cfb->lcd_pwr); 184 } else { 185 if (regulator_is_enabled(cfb->lcd_pwr)) 186 return regulator_disable(cfb->lcd_pwr); 187 } 188 } 189 190 return 0; 191 } 192 193 static const struct lcd_ops clps711x_lcd_ops = { 194 .get_power = clps711x_lcd_get_power, 195 .set_power = clps711x_lcd_set_power, 196 }; 197 198 static int clps711x_fb_probe(struct platform_device *pdev) 199 { 200 struct device *dev = &pdev->dev; 201 struct device_node *disp, *np = dev->of_node; 202 struct clps711x_fb_info *cfb; 203 struct lcd_device *lcd; 204 struct fb_info *info; 205 struct resource *res; 206 int ret = -ENOENT; 207 u32 val; 208 209 if (fb_get_options(CLPS711X_FB_NAME, NULL)) 210 return -ENODEV; 211 212 info = framebuffer_alloc(sizeof(*cfb), dev); 213 if (!info) 214 return -ENOMEM; 215 216 cfb = info->par; 217 platform_set_drvdata(pdev, info); 218 219 cfb->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res); 220 if (IS_ERR(cfb->base)) { 221 ret = PTR_ERR(cfb->base); 222 goto out_fb_release; 223 } 224 225 info->fix.mmio_start = res->start; 226 info->fix.mmio_len = resource_size(res); 227 228 info->screen_base = devm_platform_get_and_ioremap_resource(pdev, 1, &res); 229 if (IS_ERR(info->screen_base)) { 230 ret = PTR_ERR(info->screen_base); 231 goto out_fb_release; 232 } 233 234 /* Physical address should be aligned to 256 MiB */ 235 if (res->start & 0x0fffffff) { 236 ret = -EINVAL; 237 goto out_fb_release; 238 } 239 240 cfb->buffsize = resource_size(res); 241 info->fix.smem_start = res->start; 242 243 cfb->clk = devm_clk_get(dev, NULL); 244 if (IS_ERR(cfb->clk)) { 245 ret = PTR_ERR(cfb->clk); 246 goto out_fb_release; 247 } 248 249 cfb->syscon = syscon_regmap_lookup_by_phandle(np, "syscon"); 250 if (IS_ERR(cfb->syscon)) { 251 ret = PTR_ERR(cfb->syscon); 252 goto out_fb_release; 253 } 254 255 disp = of_parse_phandle(np, "display", 0); 256 if (!disp) { 257 dev_err(&pdev->dev, "No display defined\n"); 258 ret = -ENODATA; 259 goto out_fb_release; 260 } 261 262 ret = of_get_fb_videomode(disp, &cfb->mode, OF_USE_NATIVE_MODE); 263 if (ret) { 264 of_node_put(disp); 265 goto out_fb_release; 266 } 267 268 of_property_read_u32(disp, "ac-prescale", &cfb->ac_prescale); 269 cfb->cmap_invert = of_property_read_bool(disp, "cmap-invert"); 270 271 ret = of_property_read_u32(disp, "bits-per-pixel", 272 &info->var.bits_per_pixel); 273 of_node_put(disp); 274 if (ret) 275 goto out_fb_release; 276 277 /* Force disable LCD on any mismatch */ 278 if (info->fix.smem_start != (readb(cfb->base + CLPS711X_FBADDR) << 28)) 279 regmap_update_bits(cfb->syscon, SYSCON_OFFSET, 280 SYSCON1_LCDEN, 0); 281 282 ret = regmap_read(cfb->syscon, SYSCON_OFFSET, &val); 283 if (ret) 284 goto out_fb_release; 285 286 if (!(val & SYSCON1_LCDEN)) { 287 /* Setup start FB address */ 288 writeb(info->fix.smem_start >> 28, cfb->base + CLPS711X_FBADDR); 289 /* Clean FB memory */ 290 memset_io(info->screen_base, 0, cfb->buffsize); 291 } 292 293 cfb->lcd_pwr = devm_regulator_get(dev, "lcd"); 294 if (PTR_ERR(cfb->lcd_pwr) == -EPROBE_DEFER) { 295 ret = -EPROBE_DEFER; 296 goto out_fb_release; 297 } 298 299 info->fbops = &clps711x_fb_ops; 300 info->var.activate = FB_ACTIVATE_FORCE | FB_ACTIVATE_NOW; 301 info->var.height = -1; 302 info->var.width = -1; 303 info->var.vmode = FB_VMODE_NONINTERLACED; 304 info->fix.type = FB_TYPE_PACKED_PIXELS; 305 info->fix.accel = FB_ACCEL_NONE; 306 strscpy(info->fix.id, CLPS711X_FB_NAME, sizeof(info->fix.id)); 307 fb_videomode_to_var(&info->var, &cfb->mode); 308 309 ret = fb_alloc_cmap(&info->cmap, BIT(CLPS711X_FB_BPP_MAX), 0); 310 if (ret) 311 goto out_fb_release; 312 313 ret = fb_set_var(info, &info->var); 314 if (ret) 315 goto out_fb_dealloc_cmap; 316 317 lcd = devm_lcd_device_register(dev, "clps711x-lcd", dev, cfb, 318 &clps711x_lcd_ops); 319 if (IS_ERR(lcd)) { 320 ret = PTR_ERR(lcd); 321 goto out_fb_dealloc_cmap; 322 } 323 324 info->lcd_dev = lcd; 325 326 ret = register_framebuffer(info); 327 if (ret) 328 goto out_fb_dealloc_cmap; 329 330 return 0; 331 332 unregister_framebuffer(info); 333 334 out_fb_dealloc_cmap: 335 regmap_update_bits(cfb->syscon, SYSCON_OFFSET, SYSCON1_LCDEN, 0); 336 fb_dealloc_cmap(&info->cmap); 337 338 out_fb_release: 339 framebuffer_release(info); 340 341 return ret; 342 } 343 344 static void clps711x_fb_remove(struct platform_device *pdev) 345 { 346 struct fb_info *info = platform_get_drvdata(pdev); 347 struct clps711x_fb_info *cfb = info->par; 348 349 regmap_update_bits(cfb->syscon, SYSCON_OFFSET, SYSCON1_LCDEN, 0); 350 351 unregister_framebuffer(info); 352 fb_dealloc_cmap(&info->cmap); 353 framebuffer_release(info); 354 } 355 356 static const struct of_device_id clps711x_fb_dt_ids[] = { 357 { .compatible = "cirrus,ep7209-fb", }, 358 { } 359 }; 360 MODULE_DEVICE_TABLE(of, clps711x_fb_dt_ids); 361 362 static struct platform_driver clps711x_fb_driver = { 363 .driver = { 364 .name = CLPS711X_FB_NAME, 365 .of_match_table = clps711x_fb_dt_ids, 366 }, 367 .probe = clps711x_fb_probe, 368 .remove = clps711x_fb_remove, 369 }; 370 module_platform_driver(clps711x_fb_driver); 371 372 MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>"); 373 MODULE_DESCRIPTION("Cirrus Logic CLPS711X FB driver"); 374 MODULE_LICENSE("GPL"); 375