1 files changed, 318 insertions, 0 deletions

diff --git a/drivers/video/goldfishfb.c b/drivers/video/goldfishfb.c
new file mode 100644
index 000000000000..489abb32fc04
--- /dev/null
+++ b/drivers/video/goldfishfb.c
@@ -0,0 +1,318 @@
+/*
+ * Copyright (C) 2007 Google, Inc.
+ * Copyright (C) 2012 Intel, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/dma-mapping.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/mm.h>
+#include <linux/fb.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/platform_device.h>
+
+enum {
+        FB_GET_WIDTH        = 0x00,
+        FB_GET_HEIGHT       = 0x04,
+        FB_INT_STATUS       = 0x08,
+        FB_INT_ENABLE       = 0x0c,
+        FB_SET_BASE         = 0x10,
+        FB_SET_ROTATION     = 0x14,
+        FB_SET_BLANK        = 0x18,
+        FB_GET_PHYS_WIDTH   = 0x1c,
+        FB_GET_PHYS_HEIGHT  = 0x20,
+
+        FB_INT_VSYNC             = 1U << 0,
+        FB_INT_BASE_UPDATE_DONE  = 1U << 1
+};
+
+struct goldfish_fb {
+        void __iomem *reg_base;
+        int irq;
+        spinlock_t lock;
+        wait_queue_head_t wait;
+        int base_update_count;
+        int rotation;
+        struct fb_info fb;
+        u32 cmap[16];
+};
+
+static irqreturn_t goldfish_fb_interrupt(int irq, void *dev_id)
+{
+        unsigned long irq_flags;
+        struct goldfish_fb *fb = dev_id;
+        u32 status;
+
+        spin_lock_irqsave(&fb->lock, irq_flags);
+        status = readl(fb->reg_base + FB_INT_STATUS);
+        if (status & FB_INT_BASE_UPDATE_DONE) {
+                fb->base_update_count++;
+                wake_up(&fb->wait);
+        }
+        spin_unlock_irqrestore(&fb->lock, irq_flags);
+        return status ? IRQ_HANDLED : IRQ_NONE;
+}
+
+static inline u32 convert_bitfield(int val, struct fb_bitfield *bf)
+{
+        unsigned int mask = (1 << bf->length) - 1;
+
+        return (val >> (16 - bf->length) & mask) << bf->offset;
+}
+
+static int
+goldfish_fb_setcolreg(unsigned int regno, unsigned int red, unsigned int green,
+                 unsigned int blue, unsigned int transp, struct fb_info *info)
+{
+        struct goldfish_fb *fb = container_of(info, struct goldfish_fb, fb);
+
+        if (regno < 16) {
+                fb->cmap[regno] = convert_bitfield(transp, &fb->fb.var.transp) |
+                                  convert_bitfield(blue, &fb->fb.var.blue) |
+                                  convert_bitfield(green, &fb->fb.var.green) |
+                                  convert_bitfield(red, &fb->fb.var.red);
+                return 0;
+        } else {
+                return 1;
+        }
+}
+
+static int goldfish_fb_check_var(struct fb_var_screeninfo *var,
+                                                        struct fb_info *info)
+{
+        if ((var->rotate & 1) != (info->var.rotate & 1)) {
+                if ((var->xres != info->var.yres) ||
+                                (var->yres != info->var.xres) ||
+                                (var->xres_virtual != info->var.yres) ||
+                                (var->yres_virtual > info->var.xres * 2) ||
+                                (var->yres_virtual < info->var.xres)) {
+                        return -EINVAL;
+                }
+        } else {
+                if ((var->xres != info->var.xres) ||
+                   (var->yres != info->var.yres) ||
+                   (var->xres_virtual != info->var.xres) ||
+                   (var->yres_virtual > info->var.yres * 2) ||
+                   (var->yres_virtual < info->var.yres)) {
+                        return -EINVAL;
+                }
+        }
+        if ((var->xoffset != info->var.xoffset) ||
+                        (var->bits_per_pixel != info->var.bits_per_pixel) ||
+                        (var->grayscale != info->var.grayscale)) {
+                return -EINVAL;
+        }
+        return 0;
+}
+
+static int goldfish_fb_set_par(struct fb_info *info)
+{
+        struct goldfish_fb *fb = container_of(info, struct goldfish_fb, fb);
+        if (fb->rotation != fb->fb.var.rotate) {
+                info->fix.line_length = info->var.xres * 2;
+                fb->rotation = fb->fb.var.rotate;
+                writel(fb->rotation, fb->reg_base + FB_SET_ROTATION);
+        }
+        return 0;
+}
+
+
+static int goldfish_fb_pan_display(struct fb_var_screeninfo *var,
+                                                        struct fb_info *info)
+{
+        unsigned long irq_flags;
+        int base_update_count;
+        struct goldfish_fb *fb = container_of(info, struct goldfish_fb, fb);
+
+        spin_lock_irqsave(&fb->lock, irq_flags);
+        base_update_count = fb->base_update_count;
+        writel(fb->fb.fix.smem_start + fb->fb.var.xres * 2 * var->yoffset,
+                                                fb->reg_base + FB_SET_BASE);
+        spin_unlock_irqrestore(&fb->lock, irq_flags);
+        wait_event_timeout(fb->wait,
+                        fb->base_update_count != base_update_count, HZ / 15);
+        if (fb->base_update_count == base_update_count)
+                pr_err("goldfish_fb_pan_display: timeout wating for base update\n");
+        return 0;
+}
+
+static int goldfish_fb_blank(int blank, struct fb_info *info)
+{
+        struct goldfish_fb *fb = container_of(info, struct goldfish_fb, fb);
+        switch (blank) {
+        case FB_BLANK_NORMAL:
+                writel(1, fb->reg_base + FB_SET_BLANK);
+                break;
+        case FB_BLANK_UNBLANK:
+                writel(0, fb->reg_base + FB_SET_BLANK);
+                break;
+        }
+        return 0;
+}
+
+static struct fb_ops goldfish_fb_ops = {
+        .owner          = THIS_MODULE,
+        .fb_check_var   = goldfish_fb_check_var,
+        .fb_set_par     = goldfish_fb_set_par,
+        .fb_setcolreg   = goldfish_fb_setcolreg,
+        .fb_pan_display = goldfish_fb_pan_display,
+        .fb_blank       = goldfish_fb_blank,
+        .fb_fillrect    = cfb_fillrect,
+        .fb_copyarea    = cfb_copyarea,
+        .fb_imageblit   = cfb_imageblit,
+};
+
+
+static int goldfish_fb_probe(struct platform_device *pdev)
+{
+        int ret;
+        struct resource *r;
+        struct goldfish_fb *fb;
+        size_t framesize;
+        u32 width, height;
+        dma_addr_t fbpaddr;
+
+        fb = kzalloc(sizeof(*fb), GFP_KERNEL);
+        if (fb == NULL) {
+                ret = -ENOMEM;
+                goto err_fb_alloc_failed;
+        }
+        spin_lock_init(&fb->lock);
+        init_waitqueue_head(&fb->wait);
+        platform_set_drvdata(pdev, fb);
+
+        r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (r == NULL) {
+                ret = -ENODEV;
+                goto err_no_io_base;
+        }
+        fb->reg_base = ioremap(r->start, PAGE_SIZE);
+        if (fb->reg_base == NULL) {
+                ret = -ENOMEM;
+                goto err_no_io_base;
+        }
+
+        fb->irq = platform_get_irq(pdev, 0);
+        if (fb->irq <= 0) {
+                ret = -ENODEV;
+                goto err_no_irq;
+        }
+
+        width = readl(fb->reg_base + FB_GET_WIDTH);
+        height = readl(fb->reg_base + FB_GET_HEIGHT);
+
+        fb->fb.fbops            = &goldfish_fb_ops;
+        fb->fb.flags            = FBINFO_FLAG_DEFAULT;
+        fb->fb.pseudo_palette   = fb->cmap;
+        fb->fb.fix.type         = FB_TYPE_PACKED_PIXELS;
+        fb->fb.fix.visual = FB_VISUAL_TRUECOLOR;
+        fb->fb.fix.line_length = width * 2;
+        fb->fb.fix.accel        = FB_ACCEL_NONE;
+        fb->fb.fix.ypanstep = 1;
+
+        fb->fb.var.xres         = width;
+        fb->fb.var.yres         = height;
+        fb->fb.var.xres_virtual = width;
+        fb->fb.var.yres_virtual = height * 2;
+        fb->fb.var.bits_per_pixel = 16;
+        fb->fb.var.activate     = FB_ACTIVATE_NOW;
+        fb->fb.var.height       = readl(fb->reg_base + FB_GET_PHYS_HEIGHT);
+        fb->fb.var.width        = readl(fb->reg_base + FB_GET_PHYS_WIDTH);
+        fb->fb.var.pixclock     = 10000;
+
+        fb->fb.var.red.offset = 11;
+        fb->fb.var.red.length = 5;
+        fb->fb.var.green.offset = 5;
+        fb->fb.var.green.length = 6;
+        fb->fb.var.blue.offset = 0;
+        fb->fb.var.blue.length = 5;
+
+        framesize = width * height * 2 * 2;
+        fb->fb.screen_base = (char __force __iomem *)dma_alloc_coherent(
+                                                &pdev->dev, framesize,
+                                                &fbpaddr, GFP_KERNEL);
+        pr_debug("allocating frame buffer %d * %d, got %p\n",
+                                        width, height, fb->fb.screen_base);
+        if (fb->fb.screen_base == NULL) {
+                ret = -ENOMEM;
+                goto err_alloc_screen_base_failed;
+        }
+        fb->fb.fix.smem_start = fbpaddr;
+        fb->fb.fix.smem_len = framesize;
+
+        ret = fb_set_var(&fb->fb, &fb->fb.var);
+        if (ret)
+                goto err_fb_set_var_failed;
+
+        ret = request_irq(fb->irq, goldfish_fb_interrupt, IRQF_SHARED,
+                                                        pdev->name, fb);
+        if (ret)
+                goto err_request_irq_failed;
+
+        writel(FB_INT_BASE_UPDATE_DONE, fb->reg_base + FB_INT_ENABLE);
+        goldfish_fb_pan_display(&fb->fb.var, &fb->fb); /* updates base */
+
+        ret = register_framebuffer(&fb->fb);
+        if (ret)
+                goto err_register_framebuffer_failed;
+        return 0;
+
+err_register_framebuffer_failed:
+        free_irq(fb->irq, fb);
+err_request_irq_failed:
+err_fb_set_var_failed:
+        dma_free_coherent(&pdev->dev, framesize,
+                                (void *)fb->fb.screen_base,
+                                fb->fb.fix.smem_start);
+err_alloc_screen_base_failed:
+err_no_irq:
+        iounmap(fb->reg_base);
+err_no_io_base:
+        kfree(fb);
+err_fb_alloc_failed:
+        return ret;
+}
+
+static int goldfish_fb_remove(struct platform_device *pdev)
+{
+        size_t framesize;
+        struct goldfish_fb *fb = platform_get_drvdata(pdev);
+
+        framesize = fb->fb.var.xres_virtual * fb->fb.var.yres_virtual * 2;
+        unregister_framebuffer(&fb->fb);
+        free_irq(fb->irq, fb);
+
+        dma_free_coherent(&pdev->dev, framesize, (void *)fb->fb.screen_base,
+                                                fb->fb.fix.smem_start);
+        iounmap(fb->reg_base);
+        return 0;
+}
+
+
+static struct platform_driver goldfish_fb_driver = {
+        .probe          = goldfish_fb_probe,
+        .remove         = goldfish_fb_remove,
+        .driver = {
+                .name = "goldfish_fb"
+        }
+};
+
+module_platform_driver(goldfish_fb_driver);
+
+MODULE_LICENSE("GPL v2");