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0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  *  linux/drivers/video/vt8500lcdfb.c
0004  *
0005  *  Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
0006  *
0007  * Based on skeletonfb.c and pxafb.c
0008  */
0009 
0010 #include <linux/delay.h>
0011 #include <linux/dma-mapping.h>
0012 #include <linux/errno.h>
0013 #include <linux/fb.h>
0014 #include <linux/init.h>
0015 #include <linux/interrupt.h>
0016 #include <linux/io.h>
0017 #include <linux/kernel.h>
0018 #include <linux/mm.h>
0019 #include <linux/module.h>
0020 #include <linux/platform_device.h>
0021 #include <linux/slab.h>
0022 #include <linux/string.h>
0023 #include <linux/wait.h>
0024 #include <video/of_display_timing.h>
0025 
0026 #include "vt8500lcdfb.h"
0027 #include "wmt_ge_rops.h"
0028 
0029 #ifdef CONFIG_OF
0030 #include <linux/of.h>
0031 #include <linux/of_fdt.h>
0032 #include <linux/memblock.h>
0033 #endif
0034 
0035 
0036 #define to_vt8500lcd_info(__info) container_of(__info, \
0037                         struct vt8500lcd_info, fb)
0038 
0039 static int vt8500lcd_set_par(struct fb_info *info)
0040 {
0041     struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
0042     int reg_bpp = 5; /* 16bpp */
0043     int i;
0044     unsigned long control0;
0045 
0046     if (!fbi)
0047         return -EINVAL;
0048 
0049     if (info->var.bits_per_pixel <= 8) {
0050         /* palettized */
0051         info->var.red.offset    = 0;
0052         info->var.red.length    = info->var.bits_per_pixel;
0053         info->var.red.msb_right = 0;
0054 
0055         info->var.green.offset  = 0;
0056         info->var.green.length  = info->var.bits_per_pixel;
0057         info->var.green.msb_right = 0;
0058 
0059         info->var.blue.offset   = 0;
0060         info->var.blue.length   = info->var.bits_per_pixel;
0061         info->var.blue.msb_right = 0;
0062 
0063         info->var.transp.offset = 0;
0064         info->var.transp.length = 0;
0065         info->var.transp.msb_right = 0;
0066 
0067         info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
0068         info->fix.line_length = info->var.xres_virtual /
0069                         (8/info->var.bits_per_pixel);
0070     } else {
0071         /* non-palettized */
0072         info->var.transp.offset = 0;
0073         info->var.transp.length = 0;
0074         info->var.transp.msb_right = 0;
0075 
0076         if (info->var.bits_per_pixel == 16) {
0077             /* RGB565 */
0078             info->var.red.offset = 11;
0079             info->var.red.length = 5;
0080             info->var.red.msb_right = 0;
0081             info->var.green.offset = 5;
0082             info->var.green.length = 6;
0083             info->var.green.msb_right = 0;
0084             info->var.blue.offset = 0;
0085             info->var.blue.length = 5;
0086             info->var.blue.msb_right = 0;
0087         } else {
0088             /* Equal depths per channel */
0089             info->var.red.offset = info->var.bits_per_pixel
0090                             * 2 / 3;
0091             info->var.red.length = info->var.bits_per_pixel / 3;
0092             info->var.red.msb_right = 0;
0093             info->var.green.offset = info->var.bits_per_pixel / 3;
0094             info->var.green.length = info->var.bits_per_pixel / 3;
0095             info->var.green.msb_right = 0;
0096             info->var.blue.offset = 0;
0097             info->var.blue.length = info->var.bits_per_pixel / 3;
0098             info->var.blue.msb_right = 0;
0099         }
0100 
0101         info->fix.visual = FB_VISUAL_TRUECOLOR;
0102         info->fix.line_length = info->var.bits_per_pixel > 16 ?
0103                     info->var.xres_virtual << 2 :
0104                     info->var.xres_virtual << 1;
0105     }
0106 
0107     for (i = 0; i < 8; i++) {
0108         if (bpp_values[i] == info->var.bits_per_pixel)
0109             reg_bpp = i;
0110     }
0111 
0112     control0 = readl(fbi->regbase) & ~0xf;
0113     writel(0, fbi->regbase);
0114     while (readl(fbi->regbase + 0x38) & 0x10)
0115         /* wait */;
0116     writel((((info->var.hsync_len - 1) & 0x3f) << 26)
0117         | ((info->var.left_margin & 0xff) << 18)
0118         | (((info->var.xres - 1) & 0x3ff) << 8)
0119         | (info->var.right_margin & 0xff), fbi->regbase + 0x4);
0120     writel((((info->var.vsync_len - 1) & 0x3f) << 26)
0121         | ((info->var.upper_margin & 0xff) << 18)
0122         | (((info->var.yres - 1) & 0x3ff) << 8)
0123         | (info->var.lower_margin & 0xff), fbi->regbase + 0x8);
0124     writel((((info->var.yres - 1) & 0x400) << 2)
0125         | ((info->var.xres - 1) & 0x400), fbi->regbase + 0x10);
0126     writel(0x80000000, fbi->regbase + 0x20);
0127     writel(control0 | (reg_bpp << 1) | 0x100, fbi->regbase);
0128 
0129     return 0;
0130 }
0131 
0132 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
0133 {
0134     chan &= 0xffff;
0135     chan >>= 16 - bf->length;
0136     return chan << bf->offset;
0137 }
0138 
0139 static int vt8500lcd_setcolreg(unsigned regno, unsigned red, unsigned green,
0140                unsigned blue, unsigned transp,
0141                struct fb_info *info) {
0142     struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
0143     int ret = 1;
0144     unsigned int val;
0145     if (regno >= 256)
0146         return -EINVAL;
0147 
0148     if (info->var.grayscale)
0149         red = green = blue =
0150             (19595 * red + 38470 * green + 7471 * blue) >> 16;
0151 
0152     switch (fbi->fb.fix.visual) {
0153     case FB_VISUAL_TRUECOLOR:
0154         if (regno < 16) {
0155             u32 *pal = fbi->fb.pseudo_palette;
0156 
0157             val  = chan_to_field(red, &fbi->fb.var.red);
0158             val |= chan_to_field(green, &fbi->fb.var.green);
0159             val |= chan_to_field(blue, &fbi->fb.var.blue);
0160 
0161             pal[regno] = val;
0162             ret = 0;
0163         }
0164         break;
0165 
0166     case FB_VISUAL_STATIC_PSEUDOCOLOR:
0167     case FB_VISUAL_PSEUDOCOLOR:
0168         writew((red & 0xf800)
0169               | ((green >> 5) & 0x7e0)
0170               | ((blue >> 11) & 0x1f),
0171                fbi->palette_cpu + sizeof(u16) * regno);
0172         break;
0173     }
0174 
0175     return ret;
0176 }
0177 
0178 static int vt8500lcd_ioctl(struct fb_info *info, unsigned int cmd,
0179              unsigned long arg)
0180 {
0181     int ret = 0;
0182     struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
0183 
0184     if (cmd == FBIO_WAITFORVSYNC) {
0185         /* Unmask End of Frame interrupt */
0186         writel(0xffffffff ^ (1 << 3), fbi->regbase + 0x3c);
0187         ret = wait_event_interruptible_timeout(fbi->wait,
0188             readl(fbi->regbase + 0x38) & (1 << 3), HZ / 10);
0189         /* Mask back to reduce unwanted interrupt traffic */
0190         writel(0xffffffff, fbi->regbase + 0x3c);
0191         if (ret < 0)
0192             return ret;
0193         if (ret == 0)
0194             return -ETIMEDOUT;
0195     }
0196 
0197     return ret;
0198 }
0199 
0200 static int vt8500lcd_pan_display(struct fb_var_screeninfo *var,
0201                 struct fb_info *info)
0202 {
0203     unsigned pixlen = info->fix.line_length / info->var.xres_virtual;
0204     unsigned off = pixlen * var->xoffset
0205               + info->fix.line_length * var->yoffset;
0206     struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
0207 
0208     writel((1 << 31)
0209          | (((info->var.xres_virtual - info->var.xres) * pixlen / 4) << 20)
0210          | (off >> 2), fbi->regbase + 0x20);
0211     return 0;
0212 }
0213 
0214 /*
0215  * vt8500lcd_blank():
0216  *  Blank the display by setting all palette values to zero.  Note,
0217  *  True Color modes do not really use the palette, so this will not
0218  *      blank the display in all modes.
0219  */
0220 static int vt8500lcd_blank(int blank, struct fb_info *info)
0221 {
0222     int i;
0223 
0224     switch (blank) {
0225     case FB_BLANK_POWERDOWN:
0226     case FB_BLANK_VSYNC_SUSPEND:
0227     case FB_BLANK_HSYNC_SUSPEND:
0228     case FB_BLANK_NORMAL:
0229         if (info->fix.visual == FB_VISUAL_PSEUDOCOLOR ||
0230             info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR)
0231             for (i = 0; i < 256; i++)
0232                 vt8500lcd_setcolreg(i, 0, 0, 0, 0, info);
0233         fallthrough;
0234     case FB_BLANK_UNBLANK:
0235         if (info->fix.visual == FB_VISUAL_PSEUDOCOLOR ||
0236             info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR)
0237             fb_set_cmap(&info->cmap, info);
0238     }
0239     return 0;
0240 }
0241 
0242 static const struct fb_ops vt8500lcd_ops = {
0243     .owner      = THIS_MODULE,
0244     .fb_set_par = vt8500lcd_set_par,
0245     .fb_setcolreg   = vt8500lcd_setcolreg,
0246     .fb_fillrect    = wmt_ge_fillrect,
0247     .fb_copyarea    = wmt_ge_copyarea,
0248     .fb_imageblit   = sys_imageblit,
0249     .fb_sync    = wmt_ge_sync,
0250     .fb_ioctl   = vt8500lcd_ioctl,
0251     .fb_pan_display = vt8500lcd_pan_display,
0252     .fb_blank   = vt8500lcd_blank,
0253 };
0254 
0255 static irqreturn_t vt8500lcd_handle_irq(int irq, void *dev_id)
0256 {
0257     struct vt8500lcd_info *fbi = dev_id;
0258 
0259     if (readl(fbi->regbase + 0x38) & (1 << 3))
0260         wake_up_interruptible(&fbi->wait);
0261 
0262     writel(0xffffffff, fbi->regbase + 0x38);
0263     return IRQ_HANDLED;
0264 }
0265 
0266 static int vt8500lcd_probe(struct platform_device *pdev)
0267 {
0268     struct vt8500lcd_info *fbi;
0269     struct resource *res;
0270     struct display_timings *disp_timing;
0271     void *addr;
0272     int irq, ret;
0273 
0274     struct fb_videomode of_mode;
0275     u32         bpp;
0276     dma_addr_t fb_mem_phys;
0277     unsigned long fb_mem_len;
0278     void *fb_mem_virt;
0279 
0280     ret = -ENOMEM;
0281     fbi = NULL;
0282 
0283     fbi = devm_kzalloc(&pdev->dev, sizeof(struct vt8500lcd_info)
0284             + sizeof(u32) * 16, GFP_KERNEL);
0285     if (!fbi)
0286         return -ENOMEM;
0287 
0288     strcpy(fbi->fb.fix.id, "VT8500 LCD");
0289 
0290     fbi->fb.fix.type    = FB_TYPE_PACKED_PIXELS;
0291     fbi->fb.fix.xpanstep    = 0;
0292     fbi->fb.fix.ypanstep    = 1;
0293     fbi->fb.fix.ywrapstep   = 0;
0294     fbi->fb.fix.accel   = FB_ACCEL_NONE;
0295 
0296     fbi->fb.var.nonstd  = 0;
0297     fbi->fb.var.activate    = FB_ACTIVATE_NOW;
0298     fbi->fb.var.height  = -1;
0299     fbi->fb.var.width   = -1;
0300     fbi->fb.var.vmode   = FB_VMODE_NONINTERLACED;
0301 
0302     fbi->fb.fbops       = &vt8500lcd_ops;
0303     fbi->fb.flags       = FBINFO_DEFAULT
0304                 | FBINFO_HWACCEL_COPYAREA
0305                 | FBINFO_HWACCEL_FILLRECT
0306                 | FBINFO_HWACCEL_YPAN
0307                 | FBINFO_VIRTFB
0308                 | FBINFO_PARTIAL_PAN_OK;
0309     fbi->fb.node        = -1;
0310 
0311     addr = fbi;
0312     addr = addr + sizeof(struct vt8500lcd_info);
0313     fbi->fb.pseudo_palette  = addr;
0314 
0315     res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
0316     if (res == NULL) {
0317         dev_err(&pdev->dev, "no I/O memory resource defined\n");
0318         return -ENODEV;
0319     }
0320 
0321     res = request_mem_region(res->start, resource_size(res), "vt8500lcd");
0322     if (res == NULL) {
0323         dev_err(&pdev->dev, "failed to request I/O memory\n");
0324         return -EBUSY;
0325     }
0326 
0327     fbi->regbase = ioremap(res->start, resource_size(res));
0328     if (fbi->regbase == NULL) {
0329         dev_err(&pdev->dev, "failed to map I/O memory\n");
0330         ret = -EBUSY;
0331         goto failed_free_res;
0332     }
0333 
0334     disp_timing = of_get_display_timings(pdev->dev.of_node);
0335     if (!disp_timing) {
0336         ret = -EINVAL;
0337         goto failed_free_io;
0338     }
0339 
0340     ret = of_get_fb_videomode(pdev->dev.of_node, &of_mode,
0341                             OF_USE_NATIVE_MODE);
0342     if (ret)
0343         goto failed_free_io;
0344 
0345     ret = of_property_read_u32(pdev->dev.of_node, "bits-per-pixel", &bpp);
0346     if (ret)
0347         goto failed_free_io;
0348 
0349     /* try allocating the framebuffer */
0350     fb_mem_len = of_mode.xres * of_mode.yres * 2 * (bpp / 8);
0351     fb_mem_virt = dma_alloc_coherent(&pdev->dev, fb_mem_len, &fb_mem_phys,
0352                 GFP_KERNEL);
0353     if (!fb_mem_virt) {
0354         pr_err("%s: Failed to allocate framebuffer\n", __func__);
0355         ret = -ENOMEM;
0356         goto failed_free_io;
0357     }
0358 
0359     fbi->fb.fix.smem_start  = fb_mem_phys;
0360     fbi->fb.fix.smem_len    = fb_mem_len;
0361     fbi->fb.screen_base = fb_mem_virt;
0362 
0363     fbi->palette_size   = PAGE_ALIGN(512);
0364     fbi->palette_cpu    = dma_alloc_coherent(&pdev->dev,
0365                              fbi->palette_size,
0366                              &fbi->palette_phys,
0367                              GFP_KERNEL);
0368     if (fbi->palette_cpu == NULL) {
0369         dev_err(&pdev->dev, "Failed to allocate palette buffer\n");
0370         ret = -ENOMEM;
0371         goto failed_free_io;
0372     }
0373 
0374     irq = platform_get_irq(pdev, 0);
0375     if (irq < 0) {
0376         dev_err(&pdev->dev, "no IRQ defined\n");
0377         ret = -ENODEV;
0378         goto failed_free_palette;
0379     }
0380 
0381     ret = request_irq(irq, vt8500lcd_handle_irq, 0, "LCD", fbi);
0382     if (ret) {
0383         dev_err(&pdev->dev, "request_irq failed: %d\n", ret);
0384         ret = -EBUSY;
0385         goto failed_free_palette;
0386     }
0387 
0388     init_waitqueue_head(&fbi->wait);
0389 
0390     if (fb_alloc_cmap(&fbi->fb.cmap, 256, 0) < 0) {
0391         dev_err(&pdev->dev, "Failed to allocate color map\n");
0392         ret = -ENOMEM;
0393         goto failed_free_irq;
0394     }
0395 
0396     fb_videomode_to_var(&fbi->fb.var, &of_mode);
0397 
0398     fbi->fb.var.xres_virtual    = of_mode.xres;
0399     fbi->fb.var.yres_virtual    = of_mode.yres * 2;
0400     fbi->fb.var.bits_per_pixel  = bpp;
0401 
0402     ret = vt8500lcd_set_par(&fbi->fb);
0403     if (ret) {
0404         dev_err(&pdev->dev, "Failed to set parameters\n");
0405         goto failed_free_cmap;
0406     }
0407 
0408     writel(fbi->fb.fix.smem_start >> 22, fbi->regbase + 0x1c);
0409     writel((fbi->palette_phys & 0xfffffe00) | 1, fbi->regbase + 0x18);
0410 
0411     platform_set_drvdata(pdev, fbi);
0412 
0413     ret = register_framebuffer(&fbi->fb);
0414     if (ret < 0) {
0415         dev_err(&pdev->dev,
0416             "Failed to register framebuffer device: %d\n", ret);
0417         goto failed_free_cmap;
0418     }
0419 
0420     /*
0421      * Ok, now enable the LCD controller
0422      */
0423     writel(readl(fbi->regbase) | 1, fbi->regbase);
0424 
0425     return 0;
0426 
0427 failed_free_cmap:
0428     if (fbi->fb.cmap.len)
0429         fb_dealloc_cmap(&fbi->fb.cmap);
0430 failed_free_irq:
0431     free_irq(irq, fbi);
0432 failed_free_palette:
0433     dma_free_coherent(&pdev->dev, fbi->palette_size,
0434               fbi->palette_cpu, fbi->palette_phys);
0435 failed_free_io:
0436     iounmap(fbi->regbase);
0437 failed_free_res:
0438     release_mem_region(res->start, resource_size(res));
0439     return ret;
0440 }
0441 
0442 static int vt8500lcd_remove(struct platform_device *pdev)
0443 {
0444     struct vt8500lcd_info *fbi = platform_get_drvdata(pdev);
0445     struct resource *res;
0446     int irq;
0447 
0448     unregister_framebuffer(&fbi->fb);
0449 
0450     writel(0, fbi->regbase);
0451 
0452     if (fbi->fb.cmap.len)
0453         fb_dealloc_cmap(&fbi->fb.cmap);
0454 
0455     irq = platform_get_irq(pdev, 0);
0456     free_irq(irq, fbi);
0457 
0458     dma_free_coherent(&pdev->dev, fbi->palette_size,
0459               fbi->palette_cpu, fbi->palette_phys);
0460 
0461     iounmap(fbi->regbase);
0462 
0463     res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
0464     release_mem_region(res->start, resource_size(res));
0465 
0466     return 0;
0467 }
0468 
0469 static const struct of_device_id via_dt_ids[] = {
0470     { .compatible = "via,vt8500-fb", },
0471     {}
0472 };
0473 
0474 static struct platform_driver vt8500lcd_driver = {
0475     .probe      = vt8500lcd_probe,
0476     .remove     = vt8500lcd_remove,
0477     .driver     = {
0478         .name   = "vt8500-lcd",
0479         .of_match_table = of_match_ptr(via_dt_ids),
0480     },
0481 };
0482 
0483 module_platform_driver(vt8500lcd_driver);
0484 
0485 MODULE_AUTHOR("Alexey Charkov <alchark@gmail.com>");
0486 MODULE_DESCRIPTION("LCD controller driver for VIA VT8500");
0487 MODULE_LICENSE("GPL v2");
0488 MODULE_DEVICE_TABLE(of, via_dt_ids);
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