NUC900 LCD Controller Driver
An LCD controller driver for nuc900s. The Linux LOGO is just fine and the
FB-Test application was ok, too.
Signed-off-by: Wang Qiang <rurality.linux@gmail.com>
Cc: Wang Zongshun <mcuos.com@gmail.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Krzysztof Helt <krzysztof.h1@poczta.fm>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/video/nuc900fb.c b/drivers/video/nuc900fb.c
new file mode 100644
index 0000000..6bf0d46
--- /dev/null
+++ b/drivers/video/nuc900fb.c
@@ -0,0 +1,779 @@
+/*
+ *
+ * Copyright (c) 2009 Nuvoton technology corporation
+ * All rights reserved.
+ *
+ * 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.
+ *
+ * Description:
+ * Nuvoton LCD Controller Driver
+ * Author:
+ * Wang Qiang (rurality.linux@gmail.com) 2009/12/11
+ */
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/tty.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/fb.h>
+#include <linux/init.h>
+#include <linux/dma-mapping.h>
+#include <linux/interrupt.h>
+#include <linux/workqueue.h>
+#include <linux/wait.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/cpufreq.h>
+#include <linux/io.h>
+#include <linux/pm.h>
+#include <linux/device.h>
+
+#include <mach/map.h>
+#include <mach/regs-clock.h>
+#include <mach/regs-ldm.h>
+#include <mach/fb.h>
+#include <mach/clkdev.h>
+
+#include "nuc900fb.h"
+
+
+/*
+ * Initialize the nuc900 video (dual) buffer address
+ */
+static void nuc900fb_set_lcdaddr(struct fb_info *info)
+{
+ struct nuc900fb_info *fbi = info->par;
+ void __iomem *regs = fbi->io;
+ unsigned long vbaddr1, vbaddr2;
+
+ vbaddr1 = info->fix.smem_start;
+ vbaddr2 = info->fix.smem_start;
+ vbaddr2 += info->fix.line_length * info->var.yres;
+
+ /* set frambuffer start phy addr*/
+ writel(vbaddr1, regs + REG_LCM_VA_BADDR0);
+ writel(vbaddr2, regs + REG_LCM_VA_BADDR1);
+
+ writel(fbi->regs.lcd_va_fbctrl, regs + REG_LCM_VA_FBCTRL);
+ writel(fbi->regs.lcd_va_scale, regs + REG_LCM_VA_SCALE);
+}
+
+/*
+ * calculate divider for lcd div
+ */
+static unsigned int nuc900fb_calc_pixclk(struct nuc900fb_info *fbi,
+ unsigned long pixclk)
+{
+ unsigned long clk = fbi->clk_rate;
+ unsigned long long div;
+
+ /* pixclk is in picseconds. our clock is in Hz*/
+ /* div = (clk * pixclk)/10^12 */
+ div = (unsigned long long)clk * pixclk;
+ div >>= 12;
+ do_div(div, 625 * 625UL * 625);
+
+ dev_dbg(fbi->dev, "pixclk %ld, divisor is %lld\n", pixclk, div);
+
+ return div;
+}
+
+/*
+ * Check the video params of 'var'.
+ */
+static int nuc900fb_check_var(struct fb_var_screeninfo *var,
+ struct fb_info *info)
+{
+ struct nuc900fb_info *fbi = info->par;
+ struct nuc900fb_mach_info *mach_info = fbi->dev->platform_data;
+ struct nuc900fb_display *display = NULL;
+ struct nuc900fb_display *default_display = mach_info->displays +
+ mach_info->default_display;
+ int i;
+
+ dev_dbg(fbi->dev, "check_var(var=%p, info=%p)\n", var, info);
+
+ /* validate x/y resolution */
+ /* choose default mode if possible */
+ if (var->xres == default_display->xres &&
+ var->yres == default_display->yres &&
+ var->bits_per_pixel == default_display->bpp)
+ display = default_display;
+ else
+ for (i = 0; i < mach_info->num_displays; i++)
+ if (var->xres == mach_info->displays[i].xres &&
+ var->yres == mach_info->displays[i].yres &&
+ var->bits_per_pixel == mach_info->displays[i].bpp) {
+ display = mach_info->displays + i;
+ break;
+ }
+
+ if (display == NULL) {
+ printk(KERN_ERR "wrong resolution or depth %dx%d at %d bit per pixel\n",
+ var->xres, var->yres, var->bits_per_pixel);
+ return -EINVAL;
+ }
+
+ /* it should be the same size as the display */
+ var->xres_virtual = display->xres;
+ var->yres_virtual = display->yres;
+ var->height = display->height;
+ var->width = display->width;
+
+ /* copy lcd settings */
+ var->pixclock = display->pixclock;
+ var->left_margin = display->left_margin;
+ var->right_margin = display->right_margin;
+ var->upper_margin = display->upper_margin;
+ var->lower_margin = display->lower_margin;
+ var->vsync_len = display->vsync_len;
+ var->hsync_len = display->hsync_len;
+
+ var->transp.offset = 0;
+ var->transp.length = 0;
+
+ fbi->regs.lcd_dccs = display->dccs;
+ fbi->regs.lcd_device_ctrl = display->devctl;
+ fbi->regs.lcd_va_fbctrl = display->fbctrl;
+ fbi->regs.lcd_va_scale = display->scale;
+
+ /* set R/G/B possions */
+ switch (var->bits_per_pixel) {
+ case 1:
+ case 2:
+ case 4:
+ case 8:
+ default:
+ var->red.offset = 0;
+ var->red.length = var->bits_per_pixel;
+ var->green = var->red;
+ var->blue = var->red;
+ break;
+ case 12:
+ var->red.length = 4;
+ var->green.length = 4;
+ var->blue.length = 4;
+ var->red.offset = 8;
+ var->green.offset = 4;
+ var->blue.offset = 0;
+ break;
+ case 16:
+ var->red.length = 5;
+ var->green.length = 6;
+ var->blue.length = 5;
+ var->red.offset = 11;
+ var->green.offset = 5;
+ var->blue.offset = 0;
+ break;
+ case 18:
+ var->red.length = 6;
+ var->green.length = 6;
+ var->blue.length = 6;
+ var->red.offset = 12;
+ var->green.offset = 6;
+ var->blue.offset = 0;
+ break;
+ case 32:
+ var->red.length = 8;
+ var->green.length = 8;
+ var->blue.length = 8;
+ var->red.offset = 16;
+ var->green.offset = 8;
+ var->blue.offset = 0;
+ break;
+ }
+
+ return 0;
+}
+
+/*
+ * Calculate lcd register values from var setting & save into hw
+ */
+static void nuc900fb_calculate_lcd_regs(const struct fb_info *info,
+ struct nuc900fb_hw *regs)
+{
+ const struct fb_var_screeninfo *var = &info->var;
+ int vtt = var->height + var->upper_margin + var->lower_margin;
+ int htt = var->width + var->left_margin + var->right_margin;
+ int hsync = var->width + var->right_margin;
+ int vsync = var->height + var->lower_margin;
+
+ regs->lcd_crtc_size = LCM_CRTC_SIZE_VTTVAL(vtt) |
+ LCM_CRTC_SIZE_HTTVAL(htt);
+ regs->lcd_crtc_dend = LCM_CRTC_DEND_VDENDVAL(var->height) |
+ LCM_CRTC_DEND_HDENDVAL(var->width);
+ regs->lcd_crtc_hr = LCM_CRTC_HR_EVAL(var->width + 5) |
+ LCM_CRTC_HR_SVAL(var->width + 1);
+ regs->lcd_crtc_hsync = LCM_CRTC_HSYNC_EVAL(hsync + var->hsync_len) |
+ LCM_CRTC_HSYNC_SVAL(hsync);
+ regs->lcd_crtc_vr = LCM_CRTC_VR_EVAL(vsync + var->vsync_len) |
+ LCM_CRTC_VR_SVAL(vsync);
+
+}
+
+/*
+ * Activate (set) the controller from the given framebuffer
+ * information
+ */
+static void nuc900fb_activate_var(struct fb_info *info)
+{
+ struct nuc900fb_info *fbi = info->par;
+ void __iomem *regs = fbi->io;
+ struct fb_var_screeninfo *var = &info->var;
+ int clkdiv;
+
+ clkdiv = nuc900fb_calc_pixclk(fbi, var->pixclock) - 1;
+ if (clkdiv < 0)
+ clkdiv = 0;
+
+ nuc900fb_calculate_lcd_regs(info, &fbi->regs);
+
+ /* set the new lcd registers*/
+
+ dev_dbg(fbi->dev, "new lcd register set:\n");
+ dev_dbg(fbi->dev, "dccs = 0x%08x\n", fbi->regs.lcd_dccs);
+ dev_dbg(fbi->dev, "dev_ctl = 0x%08x\n", fbi->regs.lcd_device_ctrl);
+ dev_dbg(fbi->dev, "crtc_size = 0x%08x\n", fbi->regs.lcd_crtc_size);
+ dev_dbg(fbi->dev, "crtc_dend = 0x%08x\n", fbi->regs.lcd_crtc_dend);
+ dev_dbg(fbi->dev, "crtc_hr = 0x%08x\n", fbi->regs.lcd_crtc_hr);
+ dev_dbg(fbi->dev, "crtc_hsync = 0x%08x\n", fbi->regs.lcd_crtc_hsync);
+ dev_dbg(fbi->dev, "crtc_vr = 0x%08x\n", fbi->regs.lcd_crtc_vr);
+
+ writel(fbi->regs.lcd_device_ctrl, regs + REG_LCM_DEV_CTRL);
+ writel(fbi->regs.lcd_crtc_size, regs + REG_LCM_CRTC_SIZE);
+ writel(fbi->regs.lcd_crtc_dend, regs + REG_LCM_CRTC_DEND);
+ writel(fbi->regs.lcd_crtc_hr, regs + REG_LCM_CRTC_HR);
+ writel(fbi->regs.lcd_crtc_hsync, regs + REG_LCM_CRTC_HSYNC);
+ writel(fbi->regs.lcd_crtc_vr, regs + REG_LCM_CRTC_VR);
+
+ /* set lcd address pointers */
+ nuc900fb_set_lcdaddr(info);
+
+ writel(fbi->regs.lcd_dccs, regs + REG_LCM_DCCS);
+}
+
+/*
+ * Alters the hardware state.
+ *
+ */
+static int nuc900fb_set_par(struct fb_info *info)
+{
+ struct fb_var_screeninfo *var = &info->var;
+
+ switch (var->bits_per_pixel) {
+ case 32:
+ case 24:
+ case 18:
+ case 16:
+ case 12:
+ info->fix.visual = FB_VISUAL_TRUECOLOR;
+ break;
+ case 1:
+ info->fix.visual = FB_VISUAL_MONO01;
+ break;
+ default:
+ info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
+ break;
+ }
+
+ info->fix.line_length = (var->xres_virtual * var->bits_per_pixel) / 8;
+
+ /* activate this new configuration */
+ nuc900fb_activate_var(info);
+ return 0;
+}
+
+static inline unsigned int chan_to_field(unsigned int chan,
+ struct fb_bitfield *bf)
+{
+ chan &= 0xffff;
+ chan >>= 16 - bf->length;
+ return chan << bf->offset;
+}
+
+static int nuc900fb_setcolreg(unsigned regno,
+ unsigned red, unsigned green, unsigned blue,
+ unsigned transp, struct fb_info *info)
+{
+ unsigned int val;
+
+ switch (info->fix.visual) {
+ case FB_VISUAL_TRUECOLOR:
+ /* true-colour, use pseuo-palette */
+ if (regno < 16) {
+ u32 *pal = info->pseudo_palette;
+
+ val = chan_to_field(red, &info->var.red);
+ val |= chan_to_field(green, &info->var.green);
+ val |= chan_to_field(blue, &info->var.blue);
+ pal[regno] = val;
+ }
+ break;
+
+ default:
+ return 1; /* unknown type */
+ }
+ return 0;
+}
+
+/**
+ * nuc900fb_blank
+ *
+ */
+static int nuc900fb_blank(int blank_mode, struct fb_info *info)
+{
+
+ return 0;
+}
+
+static struct fb_ops nuc900fb_ops = {
+ .owner = THIS_MODULE,
+ .fb_check_var = nuc900fb_check_var,
+ .fb_set_par = nuc900fb_set_par,
+ .fb_blank = nuc900fb_blank,
+ .fb_setcolreg = nuc900fb_setcolreg,
+ .fb_fillrect = cfb_fillrect,
+ .fb_copyarea = cfb_copyarea,
+ .fb_imageblit = cfb_imageblit,
+};
+
+
+static inline void modify_gpio(void __iomem *reg,
+ unsigned long set, unsigned long mask)
+{
+ unsigned long tmp;
+ tmp = readl(reg) & ~mask;
+ writel(tmp | set, reg);
+}
+
+/*
+ * Initialise LCD-related registers
+ */
+static int nuc900fb_init_registers(struct fb_info *info)
+{
+ struct nuc900fb_info *fbi = info->par;
+ struct nuc900fb_mach_info *mach_info = fbi->dev->platform_data;
+ void __iomem *regs = fbi->io;
+
+ /*reset the display engine*/
+ writel(0, regs + REG_LCM_DCCS);
+ writel(readl(regs + REG_LCM_DCCS) | LCM_DCCS_ENG_RST,
+ regs + REG_LCM_DCCS);
+ ndelay(100);
+ writel(readl(regs + REG_LCM_DCCS) & (~LCM_DCCS_ENG_RST),
+ regs + REG_LCM_DCCS);
+ ndelay(100);
+
+ writel(0, regs + REG_LCM_DEV_CTRL);
+
+ /* config gpio output */
+ modify_gpio(W90X900_VA_GPIO + 0x54, mach_info->gpio_dir,
+ mach_info->gpio_dir_mask);
+ modify_gpio(W90X900_VA_GPIO + 0x58, mach_info->gpio_data,
+ mach_info->gpio_data_mask);
+
+ return 0;
+}
+
+
+/*
+ * Alloc the SDRAM region of NUC900 for the frame buffer.
+ * The buffer should be a non-cached, non-buffered, memory region
+ * to allow palette and pixel writes without flushing the cache.
+ */
+static int __init nuc900fb_map_video_memory(struct fb_info *info)
+{
+ struct nuc900fb_info *fbi = info->par;
+ dma_addr_t map_dma;
+ unsigned long map_size = PAGE_ALIGN(info->fix.smem_len);
+
+ dev_dbg(fbi->dev, "nuc900fb_map_video_memory(fbi=%p) map_size %lu\n",
+ fbi, map_size);
+
+ info->screen_base = dma_alloc_writecombine(fbi->dev, map_size,
+ &map_dma, GFP_KERNEL);
+
+ if (!info->screen_base)
+ return -ENOMEM;
+
+ memset(info->screen_base, 0x00, map_size);
+ info->fix.smem_start = map_dma;
+
+ return 0;
+}
+
+static inline void nuc900fb_unmap_video_memory(struct fb_info *info)
+{
+ struct nuc900fb_info *fbi = info->par;
+ dma_free_writecombine(fbi->dev, PAGE_ALIGN(info->fix.smem_len),
+ info->screen_base, info->fix.smem_start);
+}
+
+static irqreturn_t nuc900fb_irqhandler(int irq, void *dev_id)
+{
+ struct nuc900fb_info *fbi = dev_id;
+ void __iomem *regs = fbi->io;
+ void __iomem *irq_base = fbi->irq_base;
+ unsigned long lcdirq = readl(regs + REG_LCM_INT_CS);
+
+ if (lcdirq & LCM_INT_CS_DISP_F_STATUS) {
+ writel(readl(irq_base) | 1<<30, irq_base);
+
+ /* wait VA_EN low */
+ if ((readl(regs + REG_LCM_DCCS) &
+ LCM_DCCS_SINGLE) == LCM_DCCS_SINGLE)
+ while ((readl(regs + REG_LCM_DCCS) &
+ LCM_DCCS_VA_EN) == LCM_DCCS_VA_EN)
+ ;
+ /* display_out-enable */
+ writel(readl(regs + REG_LCM_DCCS) | LCM_DCCS_DISP_OUT_EN,
+ regs + REG_LCM_DCCS);
+ /* va-enable*/
+ writel(readl(regs + REG_LCM_DCCS) | LCM_DCCS_VA_EN,
+ regs + REG_LCM_DCCS);
+ } else if (lcdirq & LCM_INT_CS_UNDERRUN_INT) {
+ writel(readl(irq_base) | LCM_INT_CS_UNDERRUN_INT, irq_base);
+ } else if (lcdirq & LCM_INT_CS_BUS_ERROR_INT) {
+ writel(readl(irq_base) | LCM_INT_CS_BUS_ERROR_INT, irq_base);
+ }
+
+ return IRQ_HANDLED;
+}
+
+#ifdef CONFIG_CPU_FREQ
+
+static int nuc900fb_cpufreq_transition(struct notifier_block *nb,
+ unsigned long val, void *data)
+{
+ struct nuc900fb_info *info;
+ struct fb_info *fbinfo;
+ long delta_f;
+ info = container_of(nb, struct nuc900fb_info, freq_transition);
+ fbinfo = platform_get_drvdata(to_platform_device(info->dev));
+
+ delta_f = info->clk_rate - clk_get_rate(info->clk);
+
+ if ((val == CPUFREQ_POSTCHANGE && delta_f > 0) ||
+ (val == CPUFREQ_PRECHANGE && delta_f < 0)) {
+ info->clk_rate = clk_get_rate(info->clk);
+ nuc900fb_activate_var(fbinfo);
+ }
+
+ return 0;
+}
+
+static inline int nuc900fb_cpufreq_register(struct nuc900fb_info *fbi)
+{
+ fbi->freq_transition.notifier_call = nuc900fb_cpufreq_transition;
+ return cpufreq_register_notifier(&fbi->freq_transition,
+ CPUFREQ_TRANSITION_NOTIFIER);
+}
+
+static inline void nuc900fb_cpufreq_deregister(struct nuc900fb_info *fbi)
+{
+ cpufreq_unregister_notifier(&fbi->freq_transition,
+ CPUFREQ_TRANSITION_NOTIFIER);
+}
+#else
+static inline int nuc900fb_cpufreq_transition(struct notifier_block *nb,
+ unsigned long val, void *data)
+{
+ return 0;
+}
+
+static inline int nuc900fb_cpufreq_register(struct nuc900fb_info *fbi)
+{
+ return 0;
+}
+
+static inline void nuc900fb_cpufreq_deregister(struct nuc900fb_info *info)
+{
+}
+#endif
+
+static char driver_name[] = "nuc900fb";
+
+static int __devinit nuc900fb_probe(struct platform_device *pdev)
+{
+ struct nuc900fb_info *fbi;
+ struct nuc900fb_display *display;
+ struct fb_info *fbinfo;
+ struct nuc900fb_mach_info *mach_info;
+ struct resource *res;
+ int ret;
+ int irq;
+ int i;
+ int size;
+
+ dev_dbg(&pdev->dev, "devinit\n");
+ mach_info = pdev->dev.platform_data;
+ if (mach_info == NULL) {
+ dev_err(&pdev->dev,
+ "no platform data for lcd, cannot attach\n");
+ return -EINVAL;
+ }
+
+ if (mach_info->default_display > mach_info->num_displays) {
+ dev_err(&pdev->dev,
+ "default display No. is %d but only %d displays \n",
+ mach_info->default_display, mach_info->num_displays);
+ return -EINVAL;
+ }
+
+
+ display = mach_info->displays + mach_info->default_display;
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ dev_err(&pdev->dev, "no irq for device\n");
+ return -ENOENT;
+ }
+
+ fbinfo = framebuffer_alloc(sizeof(struct nuc900fb_info), &pdev->dev);
+ if (!fbinfo)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, fbinfo);
+
+ fbi = fbinfo->par;
+ fbi->dev = &pdev->dev;
+
+#ifdef CONFIG_CPU_NUC950
+ fbi->drv_type = LCDDRV_NUC950;
+#endif
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+ size = (res->end - res->start) + 1;
+ fbi->mem = request_mem_region(res->start, size, pdev->name);
+ if (fbi->mem == NULL) {
+ dev_err(&pdev->dev, "failed to alloc memory region\n");
+ ret = -ENOENT;
+ goto free_fb;
+ }
+
+ fbi->io = ioremap(res->start, size);
+ if (fbi->io == NULL) {
+ dev_err(&pdev->dev, "ioremap() of lcd registers failed\n");
+ ret = -ENXIO;
+ goto release_mem_region;
+ }
+
+ fbi->irq_base = fbi->io + REG_LCM_INT_CS;
+
+
+ /* Stop the LCD */
+ writel(0, fbi->io + REG_LCM_DCCS);
+
+ /* fill the fbinfo*/
+ strcpy(fbinfo->fix.id, driver_name);
+ fbinfo->fix.type = FB_TYPE_PACKED_PIXELS;
+ fbinfo->fix.type_aux = 0;
+ fbinfo->fix.xpanstep = 0;
+ fbinfo->fix.ypanstep = 0;
+ fbinfo->fix.ywrapstep = 0;
+ fbinfo->fix.accel = FB_ACCEL_NONE;
+ fbinfo->var.nonstd = 0;
+ fbinfo->var.activate = FB_ACTIVATE_NOW;
+ fbinfo->var.accel_flags = 0;
+ fbinfo->var.vmode = FB_VMODE_NONINTERLACED;
+ fbinfo->fbops = &nuc900fb_ops;
+ fbinfo->flags = FBINFO_FLAG_DEFAULT;
+ fbinfo->pseudo_palette = &fbi->pseudo_pal;
+
+ ret = request_irq(irq, nuc900fb_irqhandler, IRQF_DISABLED,
+ pdev->name, fbinfo);
+ if (ret) {
+ dev_err(&pdev->dev, "cannot register irq handler %d -err %d\n",
+ irq, ret);
+ ret = -EBUSY;
+ goto release_regs;
+ }
+
+ nuc900_driver_clksrc_div(&pdev->dev, "ext", 0x2);
+
+ fbi->clk = clk_get(&pdev->dev, NULL);
+ if (!fbi->clk || IS_ERR(fbi->clk)) {
+ printk(KERN_ERR "nuc900-lcd:failed to get lcd clock source\n");
+ ret = -ENOENT;
+ goto release_irq;
+ }
+
+ clk_enable(fbi->clk);
+ dev_dbg(&pdev->dev, "got and enabled clock\n");
+
+ fbi->clk_rate = clk_get_rate(fbi->clk);
+
+ /* calutate the video buffer size */
+ for (i = 0; i < mach_info->num_displays; i++) {
+ unsigned long smem_len = mach_info->displays[i].xres;
+ smem_len *= mach_info->displays[i].yres;
+ smem_len *= mach_info->displays[i].bpp;
+ smem_len >>= 3;
+ if (fbinfo->fix.smem_len < smem_len)
+ fbinfo->fix.smem_len = smem_len;
+ }
+
+ /* Initialize Video Memory */
+ ret = nuc900fb_map_video_memory(fbinfo);
+ if (ret) {
+ printk(KERN_ERR "Failed to allocate video RAM: %x\n", ret);
+ goto release_clock;
+ }
+
+ dev_dbg(&pdev->dev, "got video memory\n");
+
+ fbinfo->var.xres = display->xres;
+ fbinfo->var.yres = display->yres;
+ fbinfo->var.bits_per_pixel = display->bpp;
+
+ nuc900fb_init_registers(fbinfo);
+
+ nuc900fb_check_var(&fbinfo->var, fbinfo);
+
+ ret = nuc900fb_cpufreq_register(fbi);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "Failed to register cpufreq\n");
+ goto free_video_memory;
+ }
+
+ ret = register_framebuffer(fbinfo);
+ if (ret) {
+ printk(KERN_ERR "failed to register framebuffer device: %d\n",
+ ret);
+ goto free_cpufreq;
+ }
+
+ printk(KERN_INFO "fb%d: %s frame buffer device\n",
+ fbinfo->node, fbinfo->fix.id);
+
+ return 0;
+
+free_cpufreq:
+ nuc900fb_cpufreq_deregister(fbi);
+free_video_memory:
+ nuc900fb_unmap_video_memory(fbinfo);
+release_clock:
+ clk_disable(fbi->clk);
+ clk_put(fbi->clk);
+release_irq:
+ free_irq(irq, fbi);
+release_regs:
+ iounmap(fbi->io);
+release_mem_region:
+ release_mem_region((unsigned long)fbi->mem, size);
+free_fb:
+ framebuffer_release(fbinfo);
+ return ret;
+}
+
+/*
+ * shutdown the lcd controller
+ */
+static void nuc900fb_stop_lcd(struct fb_info *info)
+{
+ struct nuc900fb_info *fbi = info->par;
+ void __iomem *regs = fbi->io;
+
+ writel((~LCM_DCCS_DISP_INT_EN) | (~LCM_DCCS_VA_EN) | (~LCM_DCCS_OSD_EN),
+ regs + REG_LCM_DCCS);
+}
+
+/*
+ * Cleanup
+ */
+static int nuc900fb_remove(struct platform_device *pdev)
+{
+ struct fb_info *fbinfo = platform_get_drvdata(pdev);
+ struct nuc900fb_info *fbi = fbinfo->par;
+ int irq;
+
+ nuc900fb_stop_lcd(fbinfo);
+ msleep(1);
+
+ nuc900fb_unmap_video_memory(fbinfo);
+
+ iounmap(fbi->io);
+
+ irq = platform_get_irq(pdev, 0);
+ free_irq(irq, fbi);
+
+ release_resource(fbi->mem);
+ kfree(fbi->mem);
+
+ platform_set_drvdata(pdev, NULL);
+ framebuffer_release(fbinfo);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+
+/*
+ * suspend and resume support for the lcd controller
+ */
+
+static int nuc900fb_suspend(struct platform_device *dev, pm_message_t state)
+{
+ struct fb_info *fbinfo = platform_get_drvdata(dev);
+ struct nuc900fb_info *info = fbinfo->par;
+
+ nuc900fb_stop_lcd();
+ msleep(1);
+ clk_disable(info->clk);
+ return 0;
+}
+
+static int nuc900fb_resume(struct platform_device *dev)
+{
+ struct fb_info *fbinfo = platform_get_drvdata(dev);
+ struct nuc900fb_info *fbi = fbinfo->par;
+
+ printk(KERN_INFO "nuc900fb resume\n");
+
+ clk_enable(fbi->clk);
+ msleep(1);
+
+ nuc900fb_init_registers(fbinfo);
+ nuc900fb_activate_var(bfinfo);
+
+ return 0;
+}
+
+#else
+#define nuc900fb_suspend NULL
+#define nuc900fb_resume NULL
+#endif
+
+static struct platform_driver nuc900fb_driver = {
+ .probe = nuc900fb_probe,
+ .remove = nuc900fb_remove,
+ .suspend = nuc900fb_suspend,
+ .resume = nuc900fb_resume,
+ .driver = {
+ .name = "nuc900-lcd",
+ .owner = THIS_MODULE,
+ },
+};
+
+int __devinit nuc900fb_init(void)
+{
+ return platform_driver_register(&nuc900fb_driver);
+}
+
+static void __exit nuc900fb_cleanup(void)
+{
+ platform_driver_unregister(&nuc900fb_driver);
+}
+
+module_init(nuc900fb_init);
+module_exit(nuc900fb_cleanup);
+
+MODULE_DESCRIPTION("Framebuffer driver for the NUC900");
+MODULE_LICENSE("GPL");