408 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*3 * WonderMedia WM8505 Frame Buffer device driver4 *5 * Copyright (C) 2010 Ed Spiridonov <edo.rus@gmail.com>6 * Based on vt8500lcdfb.c7 */8 9#include <linux/delay.h>10#include <linux/dma-mapping.h>11#include <linux/fb.h>12#include <linux/errno.h>13#include <linux/err.h>14#include <linux/init.h>15#include <linux/interrupt.h>16#include <linux/io.h>17#include <linux/kernel.h>18#include <linux/memblock.h>19#include <linux/mm.h>20#include <linux/module.h>21#include <linux/of.h>22#include <linux/of_fdt.h>23#include <linux/platform_device.h>24#include <linux/slab.h>25#include <linux/string.h>26#include <linux/wait.h>27#include <video/of_display_timing.h>28 29#include "wm8505fb_regs.h"30#include "wmt_ge_rops.h"31 32#define DRIVER_NAME "wm8505-fb"33 34#define to_wm8505fb_info(__info) container_of(__info, \35 struct wm8505fb_info, fb)36struct wm8505fb_info {37 struct fb_info fb;38 void __iomem *regbase;39 unsigned int contrast;40};41 42 43static int wm8505fb_init_hw(struct fb_info *info)44{45 struct wm8505fb_info *fbi = to_wm8505fb_info(info);46 47 int i;48 49 /* I know the purpose only of few registers, so clear unknown */50 for (i = 0; i < 0x200; i += 4)51 writel(0, fbi->regbase + i);52 53 /* Set frame buffer address */54 writel(fbi->fb.fix.smem_start, fbi->regbase + WMT_GOVR_FBADDR);55 writel(fbi->fb.fix.smem_start, fbi->regbase + WMT_GOVR_FBADDR1);56 57 /*58 * Set in-memory picture format to RGB59 * 0x31C sets the correct color mode (RGB565) for WM865060 * Bit 8+9 (0x300) are ignored on WM8505 as reserved61 */62 writel(0x31c, fbi->regbase + WMT_GOVR_COLORSPACE);63 writel(1, fbi->regbase + WMT_GOVR_COLORSPACE1);64 65 /* Virtual buffer size */66 writel(info->var.xres, fbi->regbase + WMT_GOVR_XRES);67 writel(info->var.xres_virtual, fbi->regbase + WMT_GOVR_XRES_VIRTUAL);68 69 /* black magic ;) */70 writel(0xf, fbi->regbase + WMT_GOVR_FHI);71 writel(4, fbi->regbase + WMT_GOVR_DVO_SET);72 writel(1, fbi->regbase + WMT_GOVR_MIF_ENABLE);73 writel(1, fbi->regbase + WMT_GOVR_REG_UPDATE);74 75 return 0;76}77 78static int wm8505fb_set_timing(struct fb_info *info)79{80 struct wm8505fb_info *fbi = to_wm8505fb_info(info);81 82 int h_start = info->var.left_margin;83 int h_end = h_start + info->var.xres;84 int h_all = h_end + info->var.right_margin;85 int h_sync = info->var.hsync_len;86 87 int v_start = info->var.upper_margin;88 int v_end = v_start + info->var.yres;89 int v_all = v_end + info->var.lower_margin;90 int v_sync = info->var.vsync_len;91 92 writel(0, fbi->regbase + WMT_GOVR_TG);93 94 writel(h_start, fbi->regbase + WMT_GOVR_TIMING_H_START);95 writel(h_end, fbi->regbase + WMT_GOVR_TIMING_H_END);96 writel(h_all, fbi->regbase + WMT_GOVR_TIMING_H_ALL);97 writel(h_sync, fbi->regbase + WMT_GOVR_TIMING_H_SYNC);98 99 writel(v_start, fbi->regbase + WMT_GOVR_TIMING_V_START);100 writel(v_end, fbi->regbase + WMT_GOVR_TIMING_V_END);101 writel(v_all, fbi->regbase + WMT_GOVR_TIMING_V_ALL);102 writel(v_sync, fbi->regbase + WMT_GOVR_TIMING_V_SYNC);103 104 writel(1, fbi->regbase + WMT_GOVR_TG);105 106 return 0;107}108 109 110static int wm8505fb_set_par(struct fb_info *info)111{112 struct wm8505fb_info *fbi = to_wm8505fb_info(info);113 114 if (!fbi)115 return -EINVAL;116 117 if (info->var.bits_per_pixel == 32) {118 info->var.red.offset = 16;119 info->var.red.length = 8;120 info->var.red.msb_right = 0;121 info->var.green.offset = 8;122 info->var.green.length = 8;123 info->var.green.msb_right = 0;124 info->var.blue.offset = 0;125 info->var.blue.length = 8;126 info->var.blue.msb_right = 0;127 info->fix.visual = FB_VISUAL_TRUECOLOR;128 info->fix.line_length = info->var.xres_virtual << 2;129 } else if (info->var.bits_per_pixel == 16) {130 info->var.red.offset = 11;131 info->var.red.length = 5;132 info->var.red.msb_right = 0;133 info->var.green.offset = 5;134 info->var.green.length = 6;135 info->var.green.msb_right = 0;136 info->var.blue.offset = 0;137 info->var.blue.length = 5;138 info->var.blue.msb_right = 0;139 info->fix.visual = FB_VISUAL_TRUECOLOR;140 info->fix.line_length = info->var.xres_virtual << 1;141 }142 143 wm8505fb_set_timing(info);144 145 writel(fbi->contrast<<16 | fbi->contrast<<8 | fbi->contrast,146 fbi->regbase + WMT_GOVR_CONTRAST);147 148 return 0;149}150 151static ssize_t contrast_show(struct device *dev,152 struct device_attribute *attr, char *buf)153{154 struct fb_info *info = dev_get_drvdata(dev);155 struct wm8505fb_info *fbi = to_wm8505fb_info(info);156 157 return sprintf(buf, "%u\n", fbi->contrast);158}159 160static ssize_t contrast_store(struct device *dev,161 struct device_attribute *attr,162 const char *buf, size_t count)163{164 struct fb_info *info = dev_get_drvdata(dev);165 struct wm8505fb_info *fbi = to_wm8505fb_info(info);166 unsigned long tmp;167 168 if (kstrtoul(buf, 10, &tmp) || (tmp > 0xff))169 return -EINVAL;170 fbi->contrast = tmp;171 172 wm8505fb_set_par(info);173 174 return count;175}176 177static DEVICE_ATTR_RW(contrast);178 179static struct attribute *wm8505fb_attrs[] = {180 &dev_attr_contrast.attr,181 NULL,182};183ATTRIBUTE_GROUPS(wm8505fb);184 185static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)186{187 chan &= 0xffff;188 chan >>= 16 - bf->length;189 return chan << bf->offset;190}191 192static int wm8505fb_setcolreg(unsigned regno, unsigned red, unsigned green,193 unsigned blue, unsigned transp,194 struct fb_info *info) {195 struct wm8505fb_info *fbi = to_wm8505fb_info(info);196 int ret = 1;197 unsigned int val;198 if (regno >= 256)199 return -EINVAL;200 201 if (info->var.grayscale)202 red = green = blue =203 (19595 * red + 38470 * green + 7471 * blue) >> 16;204 205 switch (fbi->fb.fix.visual) {206 case FB_VISUAL_TRUECOLOR:207 if (regno < 16) {208 u32 *pal = info->pseudo_palette;209 210 val = chan_to_field(red, &fbi->fb.var.red);211 val |= chan_to_field(green, &fbi->fb.var.green);212 val |= chan_to_field(blue, &fbi->fb.var.blue);213 214 pal[regno] = val;215 ret = 0;216 }217 break;218 }219 220 return ret;221}222 223static int wm8505fb_pan_display(struct fb_var_screeninfo *var,224 struct fb_info *info)225{226 struct wm8505fb_info *fbi = to_wm8505fb_info(info);227 228 writel(var->xoffset, fbi->regbase + WMT_GOVR_XPAN);229 writel(var->yoffset, fbi->regbase + WMT_GOVR_YPAN);230 return 0;231}232 233static int wm8505fb_blank(int blank, struct fb_info *info)234{235 struct wm8505fb_info *fbi = to_wm8505fb_info(info);236 237 switch (blank) {238 case FB_BLANK_UNBLANK:239 wm8505fb_set_timing(info);240 break;241 default:242 writel(0, fbi->regbase + WMT_GOVR_TIMING_V_SYNC);243 break;244 }245 246 return 0;247}248 249static const struct fb_ops wm8505fb_ops = {250 .owner = THIS_MODULE,251 __FB_DEFAULT_DMAMEM_OPS_RDWR,252 .fb_set_par = wm8505fb_set_par,253 .fb_setcolreg = wm8505fb_setcolreg,254 .fb_fillrect = wmt_ge_fillrect,255 .fb_copyarea = wmt_ge_copyarea,256 .fb_imageblit = sys_imageblit,257 .fb_sync = wmt_ge_sync,258 .fb_pan_display = wm8505fb_pan_display,259 .fb_blank = wm8505fb_blank,260 __FB_DEFAULT_IOMEM_OPS_MMAP,261};262 263static int wm8505fb_probe(struct platform_device *pdev)264{265 struct wm8505fb_info *fbi;266 struct display_timings *disp_timing;267 void *addr;268 int ret;269 270 struct fb_videomode mode;271 u32 bpp;272 dma_addr_t fb_mem_phys;273 unsigned long fb_mem_len;274 void *fb_mem_virt;275 276 fbi = devm_kzalloc(&pdev->dev, sizeof(struct wm8505fb_info) +277 sizeof(u32) * 16, GFP_KERNEL);278 if (!fbi)279 return -ENOMEM;280 281 strcpy(fbi->fb.fix.id, DRIVER_NAME);282 283 fbi->fb.fix.type = FB_TYPE_PACKED_PIXELS;284 fbi->fb.fix.xpanstep = 1;285 fbi->fb.fix.ypanstep = 1;286 fbi->fb.fix.ywrapstep = 0;287 fbi->fb.fix.accel = FB_ACCEL_NONE;288 289 fbi->fb.fbops = &wm8505fb_ops;290 fbi->fb.flags = FBINFO_HWACCEL_COPYAREA291 | FBINFO_HWACCEL_FILLRECT292 | FBINFO_HWACCEL_XPAN293 | FBINFO_HWACCEL_YPAN294 | FBINFO_VIRTFB295 | FBINFO_PARTIAL_PAN_OK;296 fbi->fb.node = -1;297 298 addr = fbi;299 addr = addr + sizeof(struct wm8505fb_info);300 fbi->fb.pseudo_palette = addr;301 302 fbi->regbase = devm_platform_ioremap_resource(pdev, 0);303 if (IS_ERR(fbi->regbase))304 return PTR_ERR(fbi->regbase);305 306 disp_timing = of_get_display_timings(pdev->dev.of_node);307 if (!disp_timing)308 return -EINVAL;309 310 ret = of_get_fb_videomode(pdev->dev.of_node, &mode, OF_USE_NATIVE_MODE);311 if (ret)312 return ret;313 314 ret = of_property_read_u32(pdev->dev.of_node, "bits-per-pixel", &bpp);315 if (ret)316 return ret;317 318 fb_videomode_to_var(&fbi->fb.var, &mode);319 320 fbi->fb.var.nonstd = 0;321 fbi->fb.var.activate = FB_ACTIVATE_NOW;322 323 fbi->fb.var.height = -1;324 fbi->fb.var.width = -1;325 326 /* try allocating the framebuffer */327 fb_mem_len = mode.xres * mode.yres * 2 * (bpp / 8);328 fb_mem_virt = dmam_alloc_coherent(&pdev->dev, fb_mem_len, &fb_mem_phys,329 GFP_KERNEL);330 if (!fb_mem_virt) {331 pr_err("%s: Failed to allocate framebuffer\n", __func__);332 return -ENOMEM;333 }334 335 fbi->fb.var.xres_virtual = mode.xres;336 fbi->fb.var.yres_virtual = mode.yres * 2;337 fbi->fb.var.bits_per_pixel = bpp;338 339 fbi->fb.fix.smem_start = fb_mem_phys;340 fbi->fb.fix.smem_len = fb_mem_len;341 fbi->fb.screen_buffer = fb_mem_virt;342 fbi->fb.screen_size = fb_mem_len;343 344 fbi->contrast = 0x10;345 ret = wm8505fb_set_par(&fbi->fb);346 if (ret) {347 dev_err(&pdev->dev, "Failed to set parameters\n");348 return ret;349 }350 351 if (fb_alloc_cmap(&fbi->fb.cmap, 256, 0) < 0) {352 dev_err(&pdev->dev, "Failed to allocate color map\n");353 return -ENOMEM;354 }355 356 wm8505fb_init_hw(&fbi->fb);357 358 platform_set_drvdata(pdev, fbi);359 360 ret = register_framebuffer(&fbi->fb);361 if (ret < 0) {362 dev_err(&pdev->dev,363 "Failed to register framebuffer device: %d\n", ret);364 if (fbi->fb.cmap.len)365 fb_dealloc_cmap(&fbi->fb.cmap);366 return ret;367 }368 369 fb_info(&fbi->fb, "%s frame buffer at 0x%lx-0x%lx\n",370 fbi->fb.fix.id, fbi->fb.fix.smem_start,371 fbi->fb.fix.smem_start + fbi->fb.fix.smem_len - 1);372 373 return 0;374}375 376static void wm8505fb_remove(struct platform_device *pdev)377{378 struct wm8505fb_info *fbi = platform_get_drvdata(pdev);379 380 unregister_framebuffer(&fbi->fb);381 382 writel(0, fbi->regbase);383 384 if (fbi->fb.cmap.len)385 fb_dealloc_cmap(&fbi->fb.cmap);386}387 388static const struct of_device_id wmt_dt_ids[] = {389 { .compatible = "wm,wm8505-fb", },390 {}391};392 393static struct platform_driver wm8505fb_driver = {394 .probe = wm8505fb_probe,395 .remove = wm8505fb_remove,396 .driver = {397 .name = DRIVER_NAME,398 .of_match_table = wmt_dt_ids,399 .dev_groups = wm8505fb_groups,400 },401};402 403module_platform_driver(wm8505fb_driver);404 405MODULE_AUTHOR("Ed Spiridonov <edo.rus@gmail.com>");406MODULE_DESCRIPTION("Framebuffer driver for WMT WM8505");407MODULE_DEVICE_TABLE(of, wmt_dt_ids);408