--- /dev/null
+/*
+ * linux/drivers/video/vt8500lcdfb.c
+ *
+ * Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
+ *
+ * Based on skeletonfb.c and pxafb.c
+ *
+ * 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/errno.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/fb.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/dma-mapping.h>
+#include <linux/platform_device.h>
+#include <linux/wait.h>
+
+#include <mach/vt8500fb.h>
+
+#include "vt8500lcdfb.h"
+#include "wmt_ge_rops.h"
+
+#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;
+ continue;
+ }
+ }
+
+ 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)
+ | (((var->xres_virtual - 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 __devinit vt8500lcd_probe(struct platform_device *pdev)
+{
+ struct vt8500lcd_info *fbi;
+ struct resource *res;
+ struct vt8500fb_platform_data *pdata = pdev->dev.platform_data;
+ void *addr;
+ int irq, ret;
+
+ ret = -ENOMEM;
+ fbi = NULL;
+
+ fbi = kzalloc(sizeof(struct vt8500lcd_info) + sizeof(u32) * 16,
+ GFP_KERNEL);
+ if (!fbi) {
+ dev_err(&pdev->dev, "Failed to initialize framebuffer device\n");
+ ret = -ENOMEM;
+ goto failed;
+ }
+
+ 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");
+ ret = -ENODEV;
+ goto failed_fbi;
+ }
+
+ res = request_mem_region(res->start, resource_size(res), "vt8500lcd");
+ if (res == NULL) {
+ dev_err(&pdev->dev, "failed to request I/O memory\n");
+ ret = -EBUSY;
+ goto failed_fbi;
+ }
+
+ 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;
+ }
+
+ fbi->fb.fix.smem_start = pdata->video_mem_phys;
+ fbi->fb.fix.smem_len = pdata->video_mem_len;
+ fbi->fb.screen_base = pdata->video_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, IRQF_DISABLED, "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, &pdata->mode);
+ fbi->fb.var.bits_per_pixel = pdata->bpp;
+ fbi->fb.var.xres_virtual = pdata->xres_virtual;
+ fbi->fb.var.yres_virtual = pdata->yres_virtual;
+
+ 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));
+failed_fbi:
+ platform_set_drvdata(pdev, NULL);
+ kfree(fbi);
+failed:
+ return ret;
+}
+
+static int __devexit 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));
+
+ kfree(fbi);
+
+ return 0;
+}
+
+static struct platform_driver vt8500lcd_driver = {
+ .probe = vt8500lcd_probe,
+ .remove = __devexit_p(vt8500lcd_remove),
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "vt8500-lcd",
+ },
+};
+
+static int __init vt8500lcd_init(void)
+{
+ return platform_driver_register(&vt8500lcd_driver);
+}
+
+static void __exit vt8500lcd_exit(void)
+{
+ platform_driver_unregister(&vt8500lcd_driver);
+}
+
+module_init(vt8500lcd_init);
+module_exit(vt8500lcd_exit);
+
+MODULE_AUTHOR("Alexey Charkov <alchark@gmail.com>");
+MODULE_DESCRIPTION("LCD controller driver for VIA VT8500");
+MODULE_LICENSE("GPL");
projects / mv-sheeva.git / blobdiff