diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/video/fbdev/vt8500lcdfb.c | 488 |
1 files changed, 488 insertions, 0 deletions
diff --git a/drivers/video/fbdev/vt8500lcdfb.c b/drivers/video/fbdev/vt8500lcdfb.c new file mode 100644 index 000000000..c61476247 --- /dev/null +++ b/drivers/video/fbdev/vt8500lcdfb.c @@ -0,0 +1,488 @@ +// 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); + fallthrough; + 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 const 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); |