| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * linux/drivers/video/vt8500lcdfb.c |
| * |
| * Copyright (C) 2010 Alexey Charkov <alchark@gmail.com> |
| * |
| * Based on skeletonfb.c and pxafb.c |
| */ |
| |
| #include <linux/delay.h> |
| #include <linux/dma-mapping.h> |
| #include <linux/errno.h> |
| #include <linux/fb.h> |
| #include <linux/init.h> |
| #include <linux/interrupt.h> |
| #include <linux/io.h> |
| #include <linux/kernel.h> |
| #include <linux/mm.h> |
| #include <linux/module.h> |
| #include <linux/platform_device.h> |
| #include <linux/slab.h> |
| #include <linux/string.h> |
| #include <linux/wait.h> |
| #include <video/of_display_timing.h> |
| |
| #include "vt8500lcdfb.h" |
| #include "wmt_ge_rops.h" |
| |
| #ifdef CONFIG_OF |
| #include <linux/of.h> |
| #include <linux/of_fdt.h> |
| #include <linux/memblock.h> |
| #endif |
| |
| |
| #define to_vt8500lcd_info(__info) container_of(__info, \ |
| struct vt8500lcd_info, fb) |
| |
| static int vt8500lcd_set_par(struct fb_info *info) |
| { |
| struct vt8500lcd_info *fbi = to_vt8500lcd_info(info); |
| int reg_bpp = 5; /* 16bpp */ |
| int i; |
| unsigned long control0; |
| |
| if (!fbi) |
| return -EINVAL; |
| |
| if (info->var.bits_per_pixel <= 8) { |
| /* palettized */ |
| info->var.red.offset = 0; |
| info->var.red.length = info->var.bits_per_pixel; |
| info->var.red.msb_right = 0; |
| |
| info->var.green.offset = 0; |
| info->var.green.length = info->var.bits_per_pixel; |
| info->var.green.msb_right = 0; |
| |
| info->var.blue.offset = 0; |
| info->var.blue.length = info->var.bits_per_pixel; |
| info->var.blue.msb_right = 0; |
| |
| info->var.transp.offset = 0; |
| info->var.transp.length = 0; |
| info->var.transp.msb_right = 0; |
| |
| info->fix.visual = FB_VISUAL_PSEUDOCOLOR; |
| info->fix.line_length = info->var.xres_virtual / |
| (8/info->var.bits_per_pixel); |
| } else { |
| /* non-palettized */ |
| info->var.transp.offset = 0; |
| info->var.transp.length = 0; |
| info->var.transp.msb_right = 0; |
| |
| if (info->var.bits_per_pixel == 16) { |
| /* RGB565 */ |
| info->var.red.offset = 11; |
| info->var.red.length = 5; |
| info->var.red.msb_right = 0; |
| info->var.green.offset = 5; |
| info->var.green.length = 6; |
| info->var.green.msb_right = 0; |
| info->var.blue.offset = 0; |
| info->var.blue.length = 5; |
| info->var.blue.msb_right = 0; |
| } else { |
| /* Equal depths per channel */ |
| info->var.red.offset = info->var.bits_per_pixel |
| * 2 / 3; |
| info->var.red.length = info->var.bits_per_pixel / 3; |
| info->var.red.msb_right = 0; |
| info->var.green.offset = info->var.bits_per_pixel / 3; |
| info->var.green.length = info->var.bits_per_pixel / 3; |
| info->var.green.msb_right = 0; |
| info->var.blue.offset = 0; |
| info->var.blue.length = info->var.bits_per_pixel / 3; |
| info->var.blue.msb_right = 0; |
| } |
| |
| info->fix.visual = FB_VISUAL_TRUECOLOR; |
| info->fix.line_length = info->var.bits_per_pixel > 16 ? |
| info->var.xres_virtual << 2 : |
| info->var.xres_virtual << 1; |
| } |
| |
| for (i = 0; i < 8; i++) { |
| if (bpp_values[i] == info->var.bits_per_pixel) |
| reg_bpp = i; |
| } |
| |
| control0 = readl(fbi->regbase) & ~0xf; |
| writel(0, fbi->regbase); |
| while (readl(fbi->regbase + 0x38) & 0x10) |
| /* wait */; |
| writel((((info->var.hsync_len - 1) & 0x3f) << 26) |
| | ((info->var.left_margin & 0xff) << 18) |
| | (((info->var.xres - 1) & 0x3ff) << 8) |
| | (info->var.right_margin & 0xff), fbi->regbase + 0x4); |
| writel((((info->var.vsync_len - 1) & 0x3f) << 26) |
| | ((info->var.upper_margin & 0xff) << 18) |
| | (((info->var.yres - 1) & 0x3ff) << 8) |
| | (info->var.lower_margin & 0xff), fbi->regbase + 0x8); |
| writel((((info->var.yres - 1) & 0x400) << 2) |
| | ((info->var.xres - 1) & 0x400), fbi->regbase + 0x10); |
| writel(0x80000000, fbi->regbase + 0x20); |
| writel(control0 | (reg_bpp << 1) | 0x100, fbi->regbase); |
| |
| return 0; |
| } |
| |
| static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf) |
| { |
| chan &= 0xffff; |
| chan >>= 16 - bf->length; |
| return chan << bf->offset; |
| } |
| |
| static int vt8500lcd_setcolreg(unsigned regno, unsigned red, unsigned green, |
| unsigned blue, unsigned transp, |
| struct fb_info *info) { |
| struct vt8500lcd_info *fbi = to_vt8500lcd_info(info); |
| int ret = 1; |
| unsigned int val; |
| if (regno >= 256) |
| return -EINVAL; |
| |
| if (info->var.grayscale) |
| red = green = blue = |
| (19595 * red + 38470 * green + 7471 * blue) >> 16; |
| |
| switch (fbi->fb.fix.visual) { |
| case FB_VISUAL_TRUECOLOR: |
| if (regno < 16) { |
| u32 *pal = fbi->fb.pseudo_palette; |
| |
| val = chan_to_field(red, &fbi->fb.var.red); |
| val |= chan_to_field(green, &fbi->fb.var.green); |
| val |= chan_to_field(blue, &fbi->fb.var.blue); |
| |
| pal[regno] = val; |
| ret = 0; |
| } |
| break; |
| |
| case FB_VISUAL_STATIC_PSEUDOCOLOR: |
| case FB_VISUAL_PSEUDOCOLOR: |
| writew((red & 0xf800) |
| | ((green >> 5) & 0x7e0) |
| | ((blue >> 11) & 0x1f), |
| fbi->palette_cpu + sizeof(u16) * regno); |
| break; |
| } |
| |
| return ret; |
| } |
| |
| static int vt8500lcd_ioctl(struct fb_info *info, unsigned int cmd, |
| unsigned long arg) |
| { |
| int ret = 0; |
| struct vt8500lcd_info *fbi = to_vt8500lcd_info(info); |
| |
| if (cmd == FBIO_WAITFORVSYNC) { |
| /* Unmask End of Frame interrupt */ |
| writel(0xffffffff ^ (1 << 3), fbi->regbase + 0x3c); |
| ret = wait_event_interruptible_timeout(fbi->wait, |
| readl(fbi->regbase + 0x38) & (1 << 3), HZ / 10); |
| /* Mask back to reduce unwanted interrupt traffic */ |
| writel(0xffffffff, fbi->regbase + 0x3c); |
| if (ret < 0) |
| return ret; |
| if (ret == 0) |
| return -ETIMEDOUT; |
| } |
| |
| return ret; |
| } |
| |
| static int vt8500lcd_pan_display(struct fb_var_screeninfo *var, |
| struct fb_info *info) |
| { |
| unsigned pixlen = info->fix.line_length / info->var.xres_virtual; |
| unsigned off = pixlen * var->xoffset |
| + info->fix.line_length * var->yoffset; |
| struct vt8500lcd_info *fbi = to_vt8500lcd_info(info); |
| |
| writel((1 << 31) |
| | (((info->var.xres_virtual - info->var.xres) * pixlen / 4) << 20) |
| | (off >> 2), fbi->regbase + 0x20); |
| return 0; |
| } |
| |
| /* |
| * vt8500lcd_blank(): |
| * Blank the display by setting all palette values to zero. Note, |
| * True Color modes do not really use the palette, so this will not |
| * blank the display in all modes. |
| */ |
| static int vt8500lcd_blank(int blank, struct fb_info *info) |
| { |
| int i; |
| |
| switch (blank) { |
| case FB_BLANK_POWERDOWN: |
| case FB_BLANK_VSYNC_SUSPEND: |
| case FB_BLANK_HSYNC_SUSPEND: |
| case FB_BLANK_NORMAL: |
| if (info->fix.visual == FB_VISUAL_PSEUDOCOLOR || |
| info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR) |
| for (i = 0; i < 256; i++) |
| vt8500lcd_setcolreg(i, 0, 0, 0, 0, info); |
| case FB_BLANK_UNBLANK: |
| if (info->fix.visual == FB_VISUAL_PSEUDOCOLOR || |
| info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR) |
| fb_set_cmap(&info->cmap, info); |
| } |
| return 0; |
| } |
| |
| static struct fb_ops vt8500lcd_ops = { |
| .owner = THIS_MODULE, |
| .fb_set_par = vt8500lcd_set_par, |
| .fb_setcolreg = vt8500lcd_setcolreg, |
| .fb_fillrect = wmt_ge_fillrect, |
| .fb_copyarea = wmt_ge_copyarea, |
| .fb_imageblit = sys_imageblit, |
| .fb_sync = wmt_ge_sync, |
| .fb_ioctl = vt8500lcd_ioctl, |
| .fb_pan_display = vt8500lcd_pan_display, |
| .fb_blank = vt8500lcd_blank, |
| }; |
| |
| static irqreturn_t vt8500lcd_handle_irq(int irq, void *dev_id) |
| { |
| struct vt8500lcd_info *fbi = dev_id; |
| |
| if (readl(fbi->regbase + 0x38) & (1 << 3)) |
| wake_up_interruptible(&fbi->wait); |
| |
| writel(0xffffffff, fbi->regbase + 0x38); |
| return IRQ_HANDLED; |
| } |
| |
| static int vt8500lcd_probe(struct platform_device *pdev) |
| { |
| struct vt8500lcd_info *fbi; |
| struct resource *res; |
| struct display_timings *disp_timing; |
| void *addr; |
| int irq, ret; |
| |
| struct fb_videomode of_mode; |
| u32 bpp; |
| dma_addr_t fb_mem_phys; |
| unsigned long fb_mem_len; |
| void *fb_mem_virt; |
| |
| ret = -ENOMEM; |
| fbi = NULL; |
| |
| fbi = devm_kzalloc(&pdev->dev, sizeof(struct vt8500lcd_info) |
| + sizeof(u32) * 16, GFP_KERNEL); |
| if (!fbi) |
| return -ENOMEM; |
| |
| strcpy(fbi->fb.fix.id, "VT8500 LCD"); |
| |
| fbi->fb.fix.type = FB_TYPE_PACKED_PIXELS; |
| fbi->fb.fix.xpanstep = 0; |
| fbi->fb.fix.ypanstep = 1; |
| fbi->fb.fix.ywrapstep = 0; |
| fbi->fb.fix.accel = FB_ACCEL_NONE; |
| |
| fbi->fb.var.nonstd = 0; |
| fbi->fb.var.activate = FB_ACTIVATE_NOW; |
| fbi->fb.var.height = -1; |
| fbi->fb.var.width = -1; |
| fbi->fb.var.vmode = FB_VMODE_NONINTERLACED; |
| |
| fbi->fb.fbops = &vt8500lcd_ops; |
| fbi->fb.flags = FBINFO_DEFAULT |
| | FBINFO_HWACCEL_COPYAREA |
| | FBINFO_HWACCEL_FILLRECT |
| | FBINFO_HWACCEL_YPAN |
| | FBINFO_VIRTFB |
| | FBINFO_PARTIAL_PAN_OK; |
| fbi->fb.node = -1; |
| |
| addr = fbi; |
| addr = addr + sizeof(struct vt8500lcd_info); |
| fbi->fb.pseudo_palette = addr; |
| |
| res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| if (res == NULL) { |
| dev_err(&pdev->dev, "no I/O memory resource defined\n"); |
| return -ENODEV; |
| } |
| |
| res = request_mem_region(res->start, resource_size(res), "vt8500lcd"); |
| if (res == NULL) { |
| dev_err(&pdev->dev, "failed to request I/O memory\n"); |
| return -EBUSY; |
| } |
| |
| fbi->regbase = ioremap(res->start, resource_size(res)); |
| if (fbi->regbase == NULL) { |
| dev_err(&pdev->dev, "failed to map I/O memory\n"); |
| ret = -EBUSY; |
| goto failed_free_res; |
| } |
| |
| disp_timing = of_get_display_timings(pdev->dev.of_node); |
| if (!disp_timing) { |
| ret = -EINVAL; |
| goto failed_free_io; |
| } |
| |
| ret = of_get_fb_videomode(pdev->dev.of_node, &of_mode, |
| OF_USE_NATIVE_MODE); |
| if (ret) |
| goto failed_free_io; |
| |
| ret = of_property_read_u32(pdev->dev.of_node, "bits-per-pixel", &bpp); |
| if (ret) |
| goto failed_free_io; |
| |
| /* try allocating the framebuffer */ |
| fb_mem_len = of_mode.xres * of_mode.yres * 2 * (bpp / 8); |
| fb_mem_virt = dma_alloc_coherent(&pdev->dev, fb_mem_len, &fb_mem_phys, |
| GFP_KERNEL); |
| if (!fb_mem_virt) { |
| pr_err("%s: Failed to allocate framebuffer\n", __func__); |
| ret = -ENOMEM; |
| goto failed_free_io; |
| } |
| |
| fbi->fb.fix.smem_start = fb_mem_phys; |
| fbi->fb.fix.smem_len = fb_mem_len; |
| fbi->fb.screen_base = fb_mem_virt; |
| |
| fbi->palette_size = PAGE_ALIGN(512); |
| fbi->palette_cpu = dma_alloc_coherent(&pdev->dev, |
| fbi->palette_size, |
| &fbi->palette_phys, |
| GFP_KERNEL); |
| if (fbi->palette_cpu == NULL) { |
| dev_err(&pdev->dev, "Failed to allocate palette buffer\n"); |
| ret = -ENOMEM; |
| goto failed_free_io; |
| } |
| |
| irq = platform_get_irq(pdev, 0); |
| if (irq < 0) { |
| dev_err(&pdev->dev, "no IRQ defined\n"); |
| ret = -ENODEV; |
| goto failed_free_palette; |
| } |
| |
| ret = request_irq(irq, vt8500lcd_handle_irq, 0, "LCD", fbi); |
| if (ret) { |
| dev_err(&pdev->dev, "request_irq failed: %d\n", ret); |
| ret = -EBUSY; |
| goto failed_free_palette; |
| } |
| |
| init_waitqueue_head(&fbi->wait); |
| |
| if (fb_alloc_cmap(&fbi->fb.cmap, 256, 0) < 0) { |
| dev_err(&pdev->dev, "Failed to allocate color map\n"); |
| ret = -ENOMEM; |
| goto failed_free_irq; |
| } |
| |
| fb_videomode_to_var(&fbi->fb.var, &of_mode); |
| |
| fbi->fb.var.xres_virtual = of_mode.xres; |
| fbi->fb.var.yres_virtual = of_mode.yres * 2; |
| fbi->fb.var.bits_per_pixel = bpp; |
| |
| ret = vt8500lcd_set_par(&fbi->fb); |
| if (ret) { |
| dev_err(&pdev->dev, "Failed to set parameters\n"); |
| goto failed_free_cmap; |
| } |
| |
| writel(fbi->fb.fix.smem_start >> 22, fbi->regbase + 0x1c); |
| writel((fbi->palette_phys & 0xfffffe00) | 1, fbi->regbase + 0x18); |
| |
| platform_set_drvdata(pdev, fbi); |
| |
| ret = register_framebuffer(&fbi->fb); |
| if (ret < 0) { |
| dev_err(&pdev->dev, |
| "Failed to register framebuffer device: %d\n", ret); |
| goto failed_free_cmap; |
| } |
| |
| /* |
| * Ok, now enable the LCD controller |
| */ |
| writel(readl(fbi->regbase) | 1, fbi->regbase); |
| |
| return 0; |
| |
| failed_free_cmap: |
| if (fbi->fb.cmap.len) |
| fb_dealloc_cmap(&fbi->fb.cmap); |
| failed_free_irq: |
| free_irq(irq, fbi); |
| failed_free_palette: |
| dma_free_coherent(&pdev->dev, fbi->palette_size, |
| fbi->palette_cpu, fbi->palette_phys); |
| failed_free_io: |
| iounmap(fbi->regbase); |
| failed_free_res: |
| release_mem_region(res->start, resource_size(res)); |
| return ret; |
| } |
| |
| static int vt8500lcd_remove(struct platform_device *pdev) |
| { |
| struct vt8500lcd_info *fbi = platform_get_drvdata(pdev); |
| struct resource *res; |
| int irq; |
| |
| unregister_framebuffer(&fbi->fb); |
| |
| writel(0, fbi->regbase); |
| |
| if (fbi->fb.cmap.len) |
| fb_dealloc_cmap(&fbi->fb.cmap); |
| |
| irq = platform_get_irq(pdev, 0); |
| free_irq(irq, fbi); |
| |
| dma_free_coherent(&pdev->dev, fbi->palette_size, |
| fbi->palette_cpu, fbi->palette_phys); |
| |
| iounmap(fbi->regbase); |
| |
| res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| release_mem_region(res->start, resource_size(res)); |
| |
| return 0; |
| } |
| |
| static const struct of_device_id via_dt_ids[] = { |
| { .compatible = "via,vt8500-fb", }, |
| {} |
| }; |
| |
| static struct platform_driver vt8500lcd_driver = { |
| .probe = vt8500lcd_probe, |
| .remove = vt8500lcd_remove, |
| .driver = { |
| .name = "vt8500-lcd", |
| .of_match_table = of_match_ptr(via_dt_ids), |
| }, |
| }; |
| |
| module_platform_driver(vt8500lcd_driver); |
| |
| MODULE_AUTHOR("Alexey Charkov <alchark@gmail.com>"); |
| MODULE_DESCRIPTION("LCD controller driver for VIA VT8500"); |
| MODULE_LICENSE("GPL v2"); |
| MODULE_DEVICE_TABLE(of, via_dt_ids); |