1 files changed, 562 insertions, 0 deletions

diff --git a/drivers/video/fbdev/grvga.c b/drivers/video/fbdev/grvga.c
new file mode 100644
index 000000000000..c078701f15f6
--- /dev/null
+++ b/drivers/video/fbdev/grvga.c
@@ -0,0 +1,562 @@
+/*
+ * 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 = {
+        .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 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 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 free_fb;
+        }
+
+        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 free_fb;
+                        }
+                } 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 (!devm_request_mem_region(&dev->dev, dev->resource[0].start,
+                    resource_size(&dev->resource[0]), "grlib-svgactrl regs")) {
+                dev_err(&dev->dev, "registers already mapped\n");
+                retval = -EBUSY;
+                goto free_fb;
+        }
+
+        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 free_fb;
+        }
+
+        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 unmap_regs;
+        }
+
+        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 dealloc_cmap;
+                }
+        }
+
+        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 (!devm_request_mem_region(&dev->dev, physical_start,
+                                             grvga_mem_size, dev->name)) {
+                        dev_err(&dev->dev, "failed to request memory region\n");
+                        retval = -ENOMEM;
+                        goto dealloc_cmap;
+                }
+
+                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 dealloc_cmap;
+                }
+        } 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 dealloc_cmap;
+                }
+
+                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 free_mem;
+        }
+
+        __raw_writel(physical_start, &par->regs->fb_pos);
+        __raw_writel(__raw_readl(&par->regs->status) | 1,  /* Enable framebuffer */
+                     &par->regs->status);
+
+        return 0;
+
+free_mem:
+        if (grvga_fix_addr)
+                iounmap((void *)virtual_start);
+        else
+                kfree((void *)virtual_start);
+dealloc_cmap:
+        fb_dealloc_cmap(&info->cmap);
+unmap_regs:
+        of_iounmap(&dev->resource[0], par->regs,
+                   resource_size(&dev->resource[0]));
+free_fb:
+        framebuffer_release(info);
+
+        return retval;
+}
+
+static int 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]));
+
+                if (!par->fb_alloced)
+                        iounmap(info->screen_base);
+                else
+                        kfree((void *)info->screen_base);
+
+                framebuffer_release(info);
+        }
+
+        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         = grvga_remove,
+};
+
+module_platform_driver(grvga_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Aeroflex Gaisler");
+MODULE_DESCRIPTION("Aeroflex Gaisler framebuffer device driver");