linux/drivers/video/fbdev/clps711x-fb.c
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   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
  37struct 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
  48static 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
  71static 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
 105static 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
 154static int clps711x_fb_blank(int blank, struct fb_info *info)
 155{
 156        /* Return happy */
 157        return 0;
 158}
 159
 160static 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
 171static 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
 178static 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
 189static 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
 206static 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
 212static 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,ep7209-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
 354out_fb_dealloc_cmap:
 355        regmap_update_bits(cfb->syscon, SYSCON_OFFSET, SYSCON1_LCDEN, 0);
 356        fb_dealloc_cmap(&info->cmap);
 357
 358out_fb_release:
 359        framebuffer_release(info);
 360
 361        return ret;
 362}
 363
 364static 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
 378static const struct of_device_id clps711x_fb_dt_ids[] = {
 379        { .compatible = "cirrus,ep7209-fb", },
 380        { }
 381};
 382MODULE_DEVICE_TABLE(of, clps711x_fb_dt_ids);
 383
 384static 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};
 392module_platform_driver(clps711x_fb_driver);
 393
 394MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
 395MODULE_DESCRIPTION("Cirrus Logic CLPS711X FB driver");
 396MODULE_LICENSE("GPL");
 397