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path: root/drivers/video/grvga.c
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Diffstat (limited to 'drivers/video/grvga.c')
-rw-r--r--drivers/video/grvga.c579
1 files changed, 579 insertions, 0 deletions
diff --git a/drivers/video/grvga.c b/drivers/video/grvga.c
new file mode 100644
index 0000000..f37e025
--- /dev/null
+++ b/drivers/video/grvga.c
@@ -0,0 +1,579 @@
+/*
+ * Driver for Aeroflex Gaisler SVGACTRL framebuffer device.
+ *
+ * 2011 (c) Aeroflex Gaisler AB
+ *
+ * Full documentation of the core can be found here:
+ * http://www.gaisler.com/products/grlib/grip.pdf
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * Contributors: Kristoffer Glembo <kristoffer@gaisler.com>
+ *
+ */
+
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/of_platform.h>
+#include <linux/of_device.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/tty.h>
+#include <linux/mm.h>
+#include <linux/fb.h>
+#include <linux/io.h>
+
+struct grvga_regs {
+ u32 status; /* 0x00 */
+ u32 video_length; /* 0x04 */
+ u32 front_porch; /* 0x08 */
+ u32 sync_length; /* 0x0C */
+ u32 line_length; /* 0x10 */
+ u32 fb_pos; /* 0x14 */
+ u32 clk_vector[4]; /* 0x18 */
+ u32 clut; /* 0x20 */
+};
+
+struct grvga_par {
+ struct grvga_regs *regs;
+ u32 color_palette[16]; /* 16 entry pseudo palette used by fbcon in true color mode */
+ int clk_sel;
+ int fb_alloced; /* = 1 if framebuffer is allocated in main memory */
+};
+
+
+static const struct fb_videomode grvga_modedb[] = {
+ {
+ /* 640x480 @ 60 Hz */
+ NULL, 60, 640, 480, 40000, 48, 16, 39, 11, 96, 2,
+ 0, FB_VMODE_NONINTERLACED
+ }, {
+ /* 800x600 @ 60 Hz */
+ NULL, 60, 800, 600, 25000, 88, 40, 23, 1, 128, 4,
+ 0, FB_VMODE_NONINTERLACED
+ }, {
+ /* 800x600 @ 72 Hz */
+ NULL, 72, 800, 600, 20000, 64, 56, 23, 37, 120, 6,
+ 0, FB_VMODE_NONINTERLACED
+ }, {
+ /* 1024x768 @ 60 Hz */
+ NULL, 60, 1024, 768, 15385, 160, 24, 29, 3, 136, 6,
+ 0, FB_VMODE_NONINTERLACED
+ }
+ };
+
+static struct fb_fix_screeninfo grvga_fix __initdata = {
+ .id = "AG SVGACTRL",
+ .type = FB_TYPE_PACKED_PIXELS,
+ .visual = FB_VISUAL_PSEUDOCOLOR,
+ .xpanstep = 0,
+ .ypanstep = 1,
+ .ywrapstep = 0,
+ .accel = FB_ACCEL_NONE,
+};
+
+static int grvga_check_var(struct fb_var_screeninfo *var,
+ struct fb_info *info)
+{
+ struct grvga_par *par = info->par;
+ int i;
+
+ if (!var->xres)
+ var->xres = 1;
+ if (!var->yres)
+ var->yres = 1;
+ if (var->bits_per_pixel <= 8)
+ var->bits_per_pixel = 8;
+ else if (var->bits_per_pixel <= 16)
+ var->bits_per_pixel = 16;
+ else if (var->bits_per_pixel <= 24)
+ var->bits_per_pixel = 24;
+ else if (var->bits_per_pixel <= 32)
+ var->bits_per_pixel = 32;
+ else
+ return -EINVAL;
+
+ var->xres_virtual = var->xres;
+ var->yres_virtual = 2*var->yres;
+
+ if (info->fix.smem_len) {
+ if ((var->yres_virtual*var->xres_virtual*var->bits_per_pixel/8) > info->fix.smem_len)
+ return -ENOMEM;
+ }
+
+ /* Which clocks that are available can be read out in these registers */
+ for (i = 0; i <= 3 ; i++) {
+ if (var->pixclock == par->regs->clk_vector[i])
+ break;
+ }
+ if (i <= 3)
+ par->clk_sel = i;
+ else
+ return -EINVAL;
+
+ switch (info->var.bits_per_pixel) {
+ case 8:
+ var->red = (struct fb_bitfield) {0, 8, 0}; /* offset, length, msb-right */
+ var->green = (struct fb_bitfield) {0, 8, 0};
+ var->blue = (struct fb_bitfield) {0, 8, 0};
+ var->transp = (struct fb_bitfield) {0, 0, 0};
+ break;
+ case 16:
+ var->red = (struct fb_bitfield) {11, 5, 0};
+ var->green = (struct fb_bitfield) {5, 6, 0};
+ var->blue = (struct fb_bitfield) {0, 5, 0};
+ var->transp = (struct fb_bitfield) {0, 0, 0};
+ break;
+ case 24:
+ case 32:
+ var->red = (struct fb_bitfield) {16, 8, 0};
+ var->green = (struct fb_bitfield) {8, 8, 0};
+ var->blue = (struct fb_bitfield) {0, 8, 0};
+ var->transp = (struct fb_bitfield) {24, 8, 0};
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int grvga_set_par(struct fb_info *info)
+{
+
+ u32 func = 0;
+ struct grvga_par *par = info->par;
+
+ __raw_writel(((info->var.yres - 1) << 16) | (info->var.xres - 1),
+ &par->regs->video_length);
+
+ __raw_writel((info->var.lower_margin << 16) | (info->var.right_margin),
+ &par->regs->front_porch);
+
+ __raw_writel((info->var.vsync_len << 16) | (info->var.hsync_len),
+ &par->regs->sync_length);
+
+ __raw_writel(((info->var.yres + info->var.lower_margin + info->var.upper_margin + info->var.vsync_len - 1) << 16) |
+ (info->var.xres + info->var.right_margin + info->var.left_margin + info->var.hsync_len - 1),
+ &par->regs->line_length);
+
+ switch (info->var.bits_per_pixel) {
+ case 8:
+ info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
+ func = 1;
+ break;
+ case 16:
+ info->fix.visual = FB_VISUAL_TRUECOLOR;
+ func = 2;
+ break;
+ case 24:
+ case 32:
+ info->fix.visual = FB_VISUAL_TRUECOLOR;
+ func = 3;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ __raw_writel((par->clk_sel << 6) | (func << 4) | 1,
+ &par->regs->status);
+
+ info->fix.line_length = (info->var.xres_virtual*info->var.bits_per_pixel)/8;
+ return 0;
+}
+
+static int grvga_setcolreg(unsigned regno, unsigned red, unsigned green, unsigned blue, unsigned transp, struct fb_info *info)
+{
+ struct grvga_par *par;
+ par = info->par;
+
+ if (regno >= 256) /* Size of CLUT */
+ return -EINVAL;
+
+ if (info->var.grayscale) {
+ /* grayscale = 0.30*R + 0.59*G + 0.11*B */
+ red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8;
+ }
+
+
+
+#define CNVT_TOHW(val, width) ((((val)<<(width))+0x7FFF-(val))>>16)
+
+ red = CNVT_TOHW(red, info->var.red.length);
+ green = CNVT_TOHW(green, info->var.green.length);
+ blue = CNVT_TOHW(blue, info->var.blue.length);
+ transp = CNVT_TOHW(transp, info->var.transp.length);
+
+#undef CNVT_TOHW
+
+ /* In PSEUDOCOLOR we use the hardware CLUT */
+ if (info->fix.visual == FB_VISUAL_PSEUDOCOLOR)
+ __raw_writel((regno << 24) | (red << 16) | (green << 8) | blue,
+ &par->regs->clut);
+
+ /* Truecolor uses the pseudo palette */
+ else if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
+ u32 v;
+ if (regno >= 16)
+ return -EINVAL;
+
+
+ v = (red << info->var.red.offset) |
+ (green << info->var.green.offset) |
+ (blue << info->var.blue.offset) |
+ (transp << info->var.transp.offset);
+
+ ((u32 *) (info->pseudo_palette))[regno] = v;
+ }
+ return 0;
+}
+
+static int grvga_pan_display(struct fb_var_screeninfo *var,
+ struct fb_info *info)
+{
+ struct grvga_par *par = info->par;
+ struct fb_fix_screeninfo *fix = &info->fix;
+ u32 base_addr;
+
+ if (var->xoffset != 0)
+ return -EINVAL;
+
+ base_addr = fix->smem_start + (var->yoffset * fix->line_length);
+ base_addr &= ~3UL;
+
+ /* Set framebuffer base address */
+ __raw_writel(base_addr,
+ &par->regs->fb_pos);
+
+ return 0;
+}
+
+static struct fb_ops grvga_ops = {
+ .owner = THIS_MODULE,
+ .fb_check_var = grvga_check_var,
+ .fb_set_par = grvga_set_par,
+ .fb_setcolreg = grvga_setcolreg,
+ .fb_pan_display = grvga_pan_display,
+ .fb_fillrect = cfb_fillrect,
+ .fb_copyarea = cfb_copyarea,
+ .fb_imageblit = cfb_imageblit
+};
+
+static int __init grvga_parse_custom(char *options,
+ struct fb_var_screeninfo *screendata)
+{
+ char *this_opt;
+ int count = 0;
+ if (!options || !*options)
+ return -1;
+
+ while ((this_opt = strsep(&options, " ")) != NULL) {
+ if (!*this_opt)
+ continue;
+
+ switch (count) {
+ case 0:
+ screendata->pixclock = simple_strtoul(this_opt, NULL, 0);
+ count++;
+ break;
+ case 1:
+ screendata->xres = screendata->xres_virtual = simple_strtoul(this_opt, NULL, 0);
+ count++;
+ break;
+ case 2:
+ screendata->right_margin = simple_strtoul(this_opt, NULL, 0);
+ count++;
+ break;
+ case 3:
+ screendata->hsync_len = simple_strtoul(this_opt, NULL, 0);
+ count++;
+ break;
+ case 4:
+ screendata->left_margin = simple_strtoul(this_opt, NULL, 0);
+ count++;
+ break;
+ case 5:
+ screendata->yres = screendata->yres_virtual = simple_strtoul(this_opt, NULL, 0);
+ count++;
+ break;
+ case 6:
+ screendata->lower_margin = simple_strtoul(this_opt, NULL, 0);
+ count++;
+ break;
+ case 7:
+ screendata->vsync_len = simple_strtoul(this_opt, NULL, 0);
+ count++;
+ break;
+ case 8:
+ screendata->upper_margin = simple_strtoul(this_opt, NULL, 0);
+ count++;
+ break;
+ case 9:
+ screendata->bits_per_pixel = simple_strtoul(this_opt, NULL, 0);
+ count++;
+ break;
+ default:
+ return -1;
+ }
+ }
+ screendata->activate = FB_ACTIVATE_NOW;
+ screendata->vmode = FB_VMODE_NONINTERLACED;
+ return 0;
+}
+
+static int __devinit grvga_probe(struct platform_device *dev)
+{
+ struct fb_info *info;
+ int retval = -ENOMEM;
+ unsigned long virtual_start;
+ unsigned long grvga_fix_addr = 0;
+ unsigned long physical_start = 0;
+ unsigned long grvga_mem_size = 0;
+ struct grvga_par *par = NULL;
+ char *options = NULL, *mode_opt = NULL;
+
+ info = framebuffer_alloc(sizeof(struct grvga_par), &dev->dev);
+ if (!info) {
+ dev_err(&dev->dev, "framebuffer_alloc failed\n");
+ return -ENOMEM;
+ }
+
+ /* Expecting: "grvga: modestring, [addr:<framebuffer physical address>], [size:<framebuffer size>]
+ *
+ * If modestring is custom:<custom mode string> we parse the string which then contains all videoparameters
+ * If address is left out, we allocate memory,
+ * if size is left out we only allocate enough to support the given mode.
+ */
+ if (fb_get_options("grvga", &options)) {
+ retval = -ENODEV;
+ goto err;
+ }
+
+ if (!options || !*options)
+ options = "640x480-8@60";
+
+ while (1) {
+ char *this_opt = strsep(&options, ",");
+
+ if (!this_opt)
+ break;
+
+ if (!strncmp(this_opt, "custom", 6)) {
+ if (grvga_parse_custom(this_opt, &info->var) < 0) {
+ dev_err(&dev->dev, "Failed to parse custom mode (%s).\n", this_opt);
+ retval = -EINVAL;
+ goto err1;
+ }
+ } else if (!strncmp(this_opt, "addr", 4))
+ grvga_fix_addr = simple_strtoul(this_opt + 5, NULL, 16);
+ else if (!strncmp(this_opt, "size", 4))
+ grvga_mem_size = simple_strtoul(this_opt + 5, NULL, 0);
+ else
+ mode_opt = this_opt;
+ }
+
+ par = info->par;
+ info->fbops = &grvga_ops;
+ info->fix = grvga_fix;
+ info->pseudo_palette = par->color_palette;
+ info->flags = FBINFO_DEFAULT | FBINFO_PARTIAL_PAN_OK | FBINFO_HWACCEL_YPAN;
+ info->fix.smem_len = grvga_mem_size;
+
+ if (!request_mem_region(dev->resource[0].start, resource_size(&dev->resource[0]), "grlib-svgactrl regs")) {
+ dev_err(&dev->dev, "registers already mapped\n");
+ retval = -EBUSY;
+ goto err;
+ }
+
+ par->regs = of_ioremap(&dev->resource[0], 0,
+ resource_size(&dev->resource[0]),
+ "grlib-svgactrl regs");
+
+ if (!par->regs) {
+ dev_err(&dev->dev, "failed to map registers\n");
+ retval = -ENOMEM;
+ goto err1;
+ }
+
+ retval = fb_alloc_cmap(&info->cmap, 256, 0);
+ if (retval < 0) {
+ dev_err(&dev->dev, "failed to allocate mem with fb_alloc_cmap\n");
+ retval = -ENOMEM;
+ goto err2;
+ }
+
+ if (mode_opt) {
+ retval = fb_find_mode(&info->var, info, mode_opt,
+ grvga_modedb, sizeof(grvga_modedb), &grvga_modedb[0], 8);
+ if (!retval || retval == 4) {
+ retval = -EINVAL;
+ goto err3;
+ }
+ }
+
+ if (!grvga_mem_size)
+ grvga_mem_size = info->var.xres_virtual * info->var.yres_virtual * info->var.bits_per_pixel/8;
+
+ if (grvga_fix_addr) {
+ /* Got framebuffer base address from argument list */
+
+ physical_start = grvga_fix_addr;
+
+ if (!request_mem_region(physical_start, grvga_mem_size, dev->name)) {
+ dev_err(&dev->dev, "failed to request memory region\n");
+ retval = -ENOMEM;
+ goto err3;
+ }
+
+ virtual_start = (unsigned long) ioremap(physical_start, grvga_mem_size);
+
+ if (!virtual_start) {
+ dev_err(&dev->dev, "error mapping framebuffer memory\n");
+ retval = -ENOMEM;
+ goto err4;
+ }
+ } else { /* Allocate frambuffer memory */
+
+ unsigned long page;
+
+ virtual_start = (unsigned long) __get_free_pages(GFP_DMA,
+ get_order(grvga_mem_size));
+ if (!virtual_start) {
+ dev_err(&dev->dev,
+ "unable to allocate framebuffer memory (%lu bytes)\n",
+ grvga_mem_size);
+ retval = -ENOMEM;
+ goto err3;
+ }
+
+ physical_start = dma_map_single(&dev->dev, (void *)virtual_start, grvga_mem_size, DMA_TO_DEVICE);
+
+ /* Set page reserved so that mmap will work. This is necessary
+ * since we'll be remapping normal memory.
+ */
+ for (page = virtual_start;
+ page < PAGE_ALIGN(virtual_start + grvga_mem_size);
+ page += PAGE_SIZE) {
+ SetPageReserved(virt_to_page(page));
+ }
+
+ par->fb_alloced = 1;
+ }
+
+ memset((unsigned long *) virtual_start, 0, grvga_mem_size);
+
+ info->screen_base = (char __iomem *) virtual_start;
+ info->fix.smem_start = physical_start;
+ info->fix.smem_len = grvga_mem_size;
+
+ dev_set_drvdata(&dev->dev, info);
+
+ dev_info(&dev->dev,
+ "Aeroflex Gaisler framebuffer device (fb%d), %dx%d-%d, using %luK of video memory @ %p\n",
+ info->node, info->var.xres, info->var.yres, info->var.bits_per_pixel,
+ grvga_mem_size >> 10, info->screen_base);
+
+ retval = register_framebuffer(info);
+ if (retval < 0) {
+ dev_err(&dev->dev, "failed to register framebuffer\n");
+ goto err4;
+ }
+
+ __raw_writel(physical_start, &par->regs->fb_pos);
+ __raw_writel(__raw_readl(&par->regs->status) | 1, /* Enable framebuffer */
+ &par->regs->status);
+
+ return 0;
+
+err4:
+ dev_set_drvdata(&dev->dev, NULL);
+ if (grvga_fix_addr) {
+ release_mem_region(physical_start, grvga_mem_size);
+ iounmap((void *)virtual_start);
+ } else
+ kfree((void *)virtual_start);
+err3:
+ fb_dealloc_cmap(&info->cmap);
+err2:
+ of_iounmap(&dev->resource[0], par->regs,
+ resource_size(&dev->resource[0]));
+err1:
+ release_mem_region(dev->resource[0].start, resource_size(&dev->resource[0]));
+err:
+ framebuffer_release(info);
+
+ return retval;
+}
+
+static int __devexit grvga_remove(struct platform_device *device)
+{
+ struct fb_info *info = dev_get_drvdata(&device->dev);
+ struct grvga_par *par = info->par;
+
+ if (info) {
+ unregister_framebuffer(info);
+ fb_dealloc_cmap(&info->cmap);
+
+ of_iounmap(&device->resource[0], par->regs,
+ resource_size(&device->resource[0]));
+ release_mem_region(device->resource[0].start, resource_size(&device->resource[0]));
+
+ if (!par->fb_alloced) {
+ release_mem_region(info->fix.smem_start, info->fix.smem_len);
+ iounmap(info->screen_base);
+ } else
+ kfree((void *)info->screen_base);
+
+ framebuffer_release(info);
+ dev_set_drvdata(&device->dev, NULL);
+ }
+
+ return 0;
+}
+
+static struct of_device_id svgactrl_of_match[] = {
+ {
+ .name = "GAISLER_SVGACTRL",
+ },
+ {
+ .name = "01_063",
+ },
+ {},
+};
+MODULE_DEVICE_TABLE(of, svgactrl_of_match);
+
+static struct platform_driver grvga_driver = {
+ .driver = {
+ .name = "grlib-svgactrl",
+ .owner = THIS_MODULE,
+ .of_match_table = svgactrl_of_match,
+ },
+ .probe = grvga_probe,
+ .remove = __devexit_p(grvga_remove),
+};
+
+
+static int __init grvga_init(void)
+{
+ return platform_driver_register(&grvga_driver);
+}
+
+static void __exit grvga_exit(void)
+{
+ platform_driver_unregister(&grvga_driver);
+}
+
+module_init(grvga_init);
+module_exit(grvga_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Aeroflex Gaisler");
+MODULE_DESCRIPTION("Aeroflex Gaisler framebuffer device driver");

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