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_check_fb(struct lcd_device *lcddev, struct fb_info *fi) 166 { 167 struct clps711x_fb_info *cfb = dev_get_drvdata(&lcddev->dev); 168 169 return (!fi || fi->par == cfb) ? 1 : 0; 170 } 171 172 static int clps711x_lcd_get_power(struct lcd_device *lcddev) 173 { 174 struct clps711x_fb_info *cfb = dev_get_drvdata(&lcddev->dev); 175 176 if (!IS_ERR_OR_NULL(cfb->lcd_pwr)) 177 if (!regulator_is_enabled(cfb->lcd_pwr)) 178 return FB_BLANK_NORMAL; 179 180 return FB_BLANK_UNBLANK; 181 } 182 183 static int clps711x_lcd_set_power(struct lcd_device *lcddev, int blank) 184 { 185 struct clps711x_fb_info *cfb = dev_get_drvdata(&lcddev->dev); 186 187 if (!IS_ERR_OR_NULL(cfb->lcd_pwr)) { 188 if (blank == FB_BLANK_UNBLANK) { 189 if (!regulator_is_enabled(cfb->lcd_pwr)) 190 return regulator_enable(cfb->lcd_pwr); 191 } else { 192 if (regulator_is_enabled(cfb->lcd_pwr)) 193 return regulator_disable(cfb->lcd_pwr); 194 } 195 } 196 197 return 0; 198 } 199 200 static struct lcd_ops clps711x_lcd_ops = { 201 .check_fb = clps711x_lcd_check_fb, 202 .get_power = clps711x_lcd_get_power, 203 .set_power = clps711x_lcd_set_power, 204 }; 205 206 static int clps711x_fb_probe(struct platform_device *pdev) 207 { 208 struct device *dev = &pdev->dev; 209 struct device_node *disp, *np = dev->of_node; 210 struct clps711x_fb_info *cfb; 211 struct lcd_device *lcd; 212 struct fb_info *info; 213 struct resource *res; 214 int ret = -ENOENT; 215 u32 val; 216 217 if (fb_get_options(CLPS711X_FB_NAME, NULL)) 218 return -ENODEV; 219 220 info = framebuffer_alloc(sizeof(*cfb), dev); 221 if (!info) 222 return -ENOMEM; 223 224 cfb = info->par; 225 platform_set_drvdata(pdev, info); 226 227 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 228 if (!res) 229 goto out_fb_release; 230 cfb->base = devm_ioremap(dev, res->start, resource_size(res)); 231 if (!cfb->base) { 232 ret = -ENOMEM; 233 goto out_fb_release; 234 } 235 236 info->fix.mmio_start = res->start; 237 info->fix.mmio_len = resource_size(res); 238 239 info->screen_base = devm_platform_get_and_ioremap_resource(pdev, 1, &res); 240 if (IS_ERR(info->screen_base)) { 241 ret = PTR_ERR(info->screen_base); 242 goto out_fb_release; 243 } 244 245 /* Physical address should be aligned to 256 MiB */ 246 if (res->start & 0x0fffffff) { 247 ret = -EINVAL; 248 goto out_fb_release; 249 } 250 251 cfb->buffsize = resource_size(res); 252 info->fix.smem_start = res->start; 253 254 cfb->clk = devm_clk_get(dev, NULL); 255 if (IS_ERR(cfb->clk)) { 256 ret = PTR_ERR(cfb->clk); 257 goto out_fb_release; 258 } 259 260 cfb->syscon = syscon_regmap_lookup_by_phandle(np, "syscon"); 261 if (IS_ERR(cfb->syscon)) { 262 ret = PTR_ERR(cfb->syscon); 263 goto out_fb_release; 264 } 265 266 disp = of_parse_phandle(np, "display", 0); 267 if (!disp) { 268 dev_err(&pdev->dev, "No display defined\n"); 269 ret = -ENODATA; 270 goto out_fb_release; 271 } 272 273 ret = of_get_fb_videomode(disp, &cfb->mode, OF_USE_NATIVE_MODE); 274 if (ret) { 275 of_node_put(disp); 276 goto out_fb_release; 277 } 278 279 of_property_read_u32(disp, "ac-prescale", &cfb->ac_prescale); 280 cfb->cmap_invert = of_property_read_bool(disp, "cmap-invert"); 281 282 ret = of_property_read_u32(disp, "bits-per-pixel", 283 &info->var.bits_per_pixel); 284 of_node_put(disp); 285 if (ret) 286 goto out_fb_release; 287 288 /* Force disable LCD on any mismatch */ 289 if (info->fix.smem_start != (readb(cfb->base + CLPS711X_FBADDR) << 28)) 290 regmap_update_bits(cfb->syscon, SYSCON_OFFSET, 291 SYSCON1_LCDEN, 0); 292 293 ret = regmap_read(cfb->syscon, SYSCON_OFFSET, &val); 294 if (ret) 295 goto out_fb_release; 296 297 if (!(val & SYSCON1_LCDEN)) { 298 /* Setup start FB address */ 299 writeb(info->fix.smem_start >> 28, cfb->base + CLPS711X_FBADDR); 300 /* Clean FB memory */ 301 memset_io(info->screen_base, 0, cfb->buffsize); 302 } 303 304 cfb->lcd_pwr = devm_regulator_get(dev, "lcd"); 305 if (PTR_ERR(cfb->lcd_pwr) == -EPROBE_DEFER) { 306 ret = -EPROBE_DEFER; 307 goto out_fb_release; 308 } 309 310 info->fbops = &clps711x_fb_ops; 311 info->var.activate = FB_ACTIVATE_FORCE | FB_ACTIVATE_NOW; 312 info->var.height = -1; 313 info->var.width = -1; 314 info->var.vmode = FB_VMODE_NONINTERLACED; 315 info->fix.type = FB_TYPE_PACKED_PIXELS; 316 info->fix.accel = FB_ACCEL_NONE; 317 strscpy(info->fix.id, CLPS711X_FB_NAME, sizeof(info->fix.id)); 318 fb_videomode_to_var(&info->var, &cfb->mode); 319 320 ret = fb_alloc_cmap(&info->cmap, BIT(CLPS711X_FB_BPP_MAX), 0); 321 if (ret) 322 goto out_fb_release; 323 324 ret = fb_set_var(info, &info->var); 325 if (ret) 326 goto out_fb_dealloc_cmap; 327 328 ret = register_framebuffer(info); 329 if (ret) 330 goto out_fb_dealloc_cmap; 331 332 lcd = devm_lcd_device_register(dev, "clps711x-lcd", dev, cfb, 333 &clps711x_lcd_ops); 334 if (!IS_ERR(lcd)) 335 return 0; 336 337 ret = PTR_ERR(lcd); 338 unregister_framebuffer(info); 339 340 out_fb_dealloc_cmap: 341 regmap_update_bits(cfb->syscon, SYSCON_OFFSET, SYSCON1_LCDEN, 0); 342 fb_dealloc_cmap(&info->cmap); 343 344 out_fb_release: 345 framebuffer_release(info); 346 347 return ret; 348 } 349 350 static void clps711x_fb_remove(struct platform_device *pdev) 351 { 352 struct fb_info *info = platform_get_drvdata(pdev); 353 struct clps711x_fb_info *cfb = info->par; 354 355 regmap_update_bits(cfb->syscon, SYSCON_OFFSET, SYSCON1_LCDEN, 0); 356 357 unregister_framebuffer(info); 358 fb_dealloc_cmap(&info->cmap); 359 framebuffer_release(info); 360 } 361 362 static const struct of_device_id clps711x_fb_dt_ids[] = { 363 { .compatible = "cirrus,ep7209-fb", }, 364 { } 365 }; 366 MODULE_DEVICE_TABLE(of, clps711x_fb_dt_ids); 367 368 static struct platform_driver clps711x_fb_driver = { 369 .driver = { 370 .name = CLPS711X_FB_NAME, 371 .of_match_table = clps711x_fb_dt_ids, 372 }, 373 .probe = clps711x_fb_probe, 374 .remove_new = clps711x_fb_remove, 375 }; 376 module_platform_driver(clps711x_fb_driver); 377 378 MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>"); 379 MODULE_DESCRIPTION("Cirrus Logic CLPS711X FB driver"); 380 MODULE_LICENSE("GPL"); 381