FBDEV: JZ4740: Add framebuffer driver

Add support for the LCD controller on JZ4740 SoCs.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/1470/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 847 insertions, 0 deletions

diff --git a/drivers/video/jz4740_fb.c b/drivers/video/jz4740_fb.c
new file mode 100644
index 000000000000..670ecaa0385a
--- /dev/null
+++ b/drivers/video/jz4740_fb.c
@@ -0,0 +1,847 @@
+/*
+ *  Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
+ *	JZ4740 SoC LCD framebuffer driver
+ *
+ *  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.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/platform_device.h>
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+
+#include <linux/console.h>
+#include <linux/fb.h>
+
+#include <linux/dma-mapping.h>
+
+#include <asm/mach-jz4740/jz4740_fb.h>
+#include <asm/mach-jz4740/gpio.h>
+
+#define JZ_REG_LCD_CFG		0x00
+#define JZ_REG_LCD_VSYNC	0x04
+#define JZ_REG_LCD_HSYNC	0x08
+#define JZ_REG_LCD_VAT		0x0C
+#define JZ_REG_LCD_DAH		0x10
+#define JZ_REG_LCD_DAV		0x14
+#define JZ_REG_LCD_PS		0x18
+#define JZ_REG_LCD_CLS		0x1C
+#define JZ_REG_LCD_SPL		0x20
+#define JZ_REG_LCD_REV		0x24
+#define JZ_REG_LCD_CTRL		0x30
+#define JZ_REG_LCD_STATE	0x34
+#define JZ_REG_LCD_IID		0x38
+#define JZ_REG_LCD_DA0		0x40
+#define JZ_REG_LCD_SA0		0x44
+#define JZ_REG_LCD_FID0		0x48
+#define JZ_REG_LCD_CMD0		0x4C
+#define JZ_REG_LCD_DA1		0x50
+#define JZ_REG_LCD_SA1		0x54
+#define JZ_REG_LCD_FID1		0x58
+#define JZ_REG_LCD_CMD1		0x5C
+
+#define JZ_LCD_CFG_SLCD			BIT(31)
+#define JZ_LCD_CFG_PS_DISABLE		BIT(23)
+#define JZ_LCD_CFG_CLS_DISABLE		BIT(22)
+#define JZ_LCD_CFG_SPL_DISABLE		BIT(21)
+#define JZ_LCD_CFG_REV_DISABLE		BIT(20)
+#define JZ_LCD_CFG_HSYNCM		BIT(19)
+#define JZ_LCD_CFG_PCLKM		BIT(18)
+#define JZ_LCD_CFG_INV			BIT(17)
+#define JZ_LCD_CFG_SYNC_DIR		BIT(16)
+#define JZ_LCD_CFG_PS_POLARITY		BIT(15)
+#define JZ_LCD_CFG_CLS_POLARITY		BIT(14)
+#define JZ_LCD_CFG_SPL_POLARITY		BIT(13)
+#define JZ_LCD_CFG_REV_POLARITY		BIT(12)
+#define JZ_LCD_CFG_HSYNC_ACTIVE_LOW	BIT(11)
+#define JZ_LCD_CFG_PCLK_FALLING_EDGE	BIT(10)
+#define JZ_LCD_CFG_DE_ACTIVE_LOW	BIT(9)
+#define JZ_LCD_CFG_VSYNC_ACTIVE_LOW	BIT(8)
+#define JZ_LCD_CFG_18_BIT		BIT(7)
+#define JZ_LCD_CFG_PDW			(BIT(5) | BIT(4))
+#define JZ_LCD_CFG_MODE_MASK 0xf
+
+#define JZ_LCD_CTRL_BURST_4		(0x0 << 28)
+#define JZ_LCD_CTRL_BURST_8		(0x1 << 28)
+#define JZ_LCD_CTRL_BURST_16		(0x2 << 28)
+#define JZ_LCD_CTRL_RGB555		BIT(27)
+#define JZ_LCD_CTRL_OFUP		BIT(26)
+#define JZ_LCD_CTRL_FRC_GRAYSCALE_16	(0x0 << 24)
+#define JZ_LCD_CTRL_FRC_GRAYSCALE_4	(0x1 << 24)
+#define JZ_LCD_CTRL_FRC_GRAYSCALE_2	(0x2 << 24)
+#define JZ_LCD_CTRL_PDD_MASK		(0xff << 16)
+#define JZ_LCD_CTRL_EOF_IRQ		BIT(13)
+#define JZ_LCD_CTRL_SOF_IRQ		BIT(12)
+#define JZ_LCD_CTRL_OFU_IRQ		BIT(11)
+#define JZ_LCD_CTRL_IFU0_IRQ		BIT(10)
+#define JZ_LCD_CTRL_IFU1_IRQ		BIT(9)
+#define JZ_LCD_CTRL_DD_IRQ		BIT(8)
+#define JZ_LCD_CTRL_QDD_IRQ		BIT(7)
+#define JZ_LCD_CTRL_REVERSE_ENDIAN	BIT(6)
+#define JZ_LCD_CTRL_LSB_FISRT		BIT(5)
+#define JZ_LCD_CTRL_DISABLE		BIT(4)
+#define JZ_LCD_CTRL_ENABLE		BIT(3)
+#define JZ_LCD_CTRL_BPP_1		0x0
+#define JZ_LCD_CTRL_BPP_2		0x1
+#define JZ_LCD_CTRL_BPP_4		0x2
+#define JZ_LCD_CTRL_BPP_8		0x3
+#define JZ_LCD_CTRL_BPP_15_16		0x4
+#define JZ_LCD_CTRL_BPP_18_24		0x5
+
+#define JZ_LCD_CMD_SOF_IRQ BIT(15)
+#define JZ_LCD_CMD_EOF_IRQ BIT(16)
+#define JZ_LCD_CMD_ENABLE_PAL BIT(12)
+
+#define JZ_LCD_SYNC_MASK 0x3ff
+
+#define JZ_LCD_STATE_DISABLED BIT(0)
+
+struct jzfb_framedesc {
+	uint32_t next;
+	uint32_t addr;
+	uint32_t id;
+	uint32_t cmd;
+} __packed;
+
+struct jzfb {
+	struct fb_info *fb;
+	struct platform_device *pdev;
+	void __iomem *base;
+	struct resource *mem;
+	struct jz4740_fb_platform_data *pdata;
+
+	size_t vidmem_size;
+	void *vidmem;
+	dma_addr_t vidmem_phys;
+	struct jzfb_framedesc *framedesc;
+	dma_addr_t framedesc_phys;
+
+	struct clk *ldclk;
+	struct clk *lpclk;
+
+	unsigned is_enabled:1;
+	struct mutex lock;
+
+	uint32_t pseudo_palette[16];
+};
+
+static const struct fb_fix_screeninfo jzfb_fix __devinitdata = {
+	.id		= "JZ4740 FB",
+	.type		= FB_TYPE_PACKED_PIXELS,
+	.visual		= FB_VISUAL_TRUECOLOR,
+	.xpanstep	= 0,
+	.ypanstep	= 0,
+	.ywrapstep	= 0,
+	.accel		= FB_ACCEL_NONE,
+};
+
+static const struct jz_gpio_bulk_request jz_lcd_ctrl_pins[] = {
+	JZ_GPIO_BULK_PIN(LCD_PCLK),
+	JZ_GPIO_BULK_PIN(LCD_HSYNC),
+	JZ_GPIO_BULK_PIN(LCD_VSYNC),
+	JZ_GPIO_BULK_PIN(LCD_DE),
+	JZ_GPIO_BULK_PIN(LCD_PS),
+	JZ_GPIO_BULK_PIN(LCD_REV),
+	JZ_GPIO_BULK_PIN(LCD_CLS),
+	JZ_GPIO_BULK_PIN(LCD_SPL),
+};
+
+static const struct jz_gpio_bulk_request jz_lcd_data_pins[] = {
+	JZ_GPIO_BULK_PIN(LCD_DATA0),
+	JZ_GPIO_BULK_PIN(LCD_DATA1),
+	JZ_GPIO_BULK_PIN(LCD_DATA2),
+	JZ_GPIO_BULK_PIN(LCD_DATA3),
+	JZ_GPIO_BULK_PIN(LCD_DATA4),
+	JZ_GPIO_BULK_PIN(LCD_DATA5),
+	JZ_GPIO_BULK_PIN(LCD_DATA6),
+	JZ_GPIO_BULK_PIN(LCD_DATA7),
+	JZ_GPIO_BULK_PIN(LCD_DATA8),
+	JZ_GPIO_BULK_PIN(LCD_DATA9),
+	JZ_GPIO_BULK_PIN(LCD_DATA10),
+	JZ_GPIO_BULK_PIN(LCD_DATA11),
+	JZ_GPIO_BULK_PIN(LCD_DATA12),
+	JZ_GPIO_BULK_PIN(LCD_DATA13),
+	JZ_GPIO_BULK_PIN(LCD_DATA14),
+	JZ_GPIO_BULK_PIN(LCD_DATA15),
+	JZ_GPIO_BULK_PIN(LCD_DATA16),
+	JZ_GPIO_BULK_PIN(LCD_DATA17),
+};
+
+static unsigned int jzfb_num_ctrl_pins(struct jzfb *jzfb)
+{
+	unsigned int num;
+
+	switch (jzfb->pdata->lcd_type) {
+	case JZ_LCD_TYPE_GENERIC_16_BIT:
+		num = 4;
+		break;
+	case JZ_LCD_TYPE_GENERIC_18_BIT:
+		num = 4;
+		break;
+	case JZ_LCD_TYPE_8BIT_SERIAL:
+		num = 3;
+		break;
+	case JZ_LCD_TYPE_SPECIAL_TFT_1:
+	case JZ_LCD_TYPE_SPECIAL_TFT_2:
+	case JZ_LCD_TYPE_SPECIAL_TFT_3:
+		num = 8;
+		break;
+	default:
+		num = 0;
+		break;
+	}
+	return num;
+}
+
+static unsigned int jzfb_num_data_pins(struct jzfb *jzfb)
+{
+	unsigned int num;
+
+	switch (jzfb->pdata->lcd_type) {
+	case JZ_LCD_TYPE_GENERIC_16_BIT:
+		num = 16;
+		break;
+	case JZ_LCD_TYPE_GENERIC_18_BIT:
+		num = 18;
+		break;
+	case JZ_LCD_TYPE_8BIT_SERIAL:
+		num = 8;
+		break;
+	case JZ_LCD_TYPE_SPECIAL_TFT_1:
+	case JZ_LCD_TYPE_SPECIAL_TFT_2:
+	case JZ_LCD_TYPE_SPECIAL_TFT_3:
+		if (jzfb->pdata->bpp == 18)
+			num = 18;
+		else
+			num = 16;
+		break;
+	default:
+		num = 0;
+		break;
+	}
+	return num;
+}
+
+/* Based on CNVT_TOHW macro from skeletonfb.c */
+static inline uint32_t jzfb_convert_color_to_hw(unsigned val,
+	struct fb_bitfield *bf)
+{
+	return (((val << bf->length) + 0x7FFF - val) >> 16) << bf->offset;
+}
+
+static int jzfb_setcolreg(unsigned regno, unsigned red, unsigned green,
+			unsigned blue, unsigned transp, struct fb_info *fb)
+{
+	uint32_t color;
+
+	if (regno >= 16)
+		return -EINVAL;
+
+	color = jzfb_convert_color_to_hw(red, &fb->var.red);
+	color |= jzfb_convert_color_to_hw(green, &fb->var.green);
+	color |= jzfb_convert_color_to_hw(blue, &fb->var.blue);
+	color |= jzfb_convert_color_to_hw(transp, &fb->var.transp);
+
+	((uint32_t *)(fb->pseudo_palette))[regno] = color;
+
+	return 0;
+}
+
+static int jzfb_get_controller_bpp(struct jzfb *jzfb)
+{
+	switch (jzfb->pdata->bpp) {
+	case 18:
+	case 24:
+		return 32;
+	case 15:
+		return 16;
+	default:
+		return jzfb->pdata->bpp;
+	}
+}
+
+static struct fb_videomode *jzfb_get_mode(struct jzfb *jzfb,
+	struct fb_var_screeninfo *var)
+{
+	size_t i;
+	struct fb_videomode *mode = jzfb->pdata->modes;
+
+	for (i = 0; i < jzfb->pdata->num_modes; ++i, ++mode) {
+		if (mode->xres == var->xres && mode->yres == var->yres)
+			return mode;
+	}
+
+	return NULL;
+}
+
+static int jzfb_check_var(struct fb_var_screeninfo *var, struct fb_info *fb)
+{
+	struct jzfb *jzfb = fb->par;
+	struct fb_videomode *mode;
+
+	if (var->bits_per_pixel != jzfb_get_controller_bpp(jzfb) &&
+		var->bits_per_pixel != jzfb->pdata->bpp)
+		return -EINVAL;
+
+	mode = jzfb_get_mode(jzfb, var);
+	if (mode == NULL)
+		return -EINVAL;
+
+	fb_videomode_to_var(var, mode);
+
+	switch (jzfb->pdata->bpp) {
+	case 8:
+		break;
+	case 15:
+		var->red.offset = 10;
+		var->red.length = 5;
+		var->green.offset = 6;
+		var->green.length = 5;
+		var->blue.offset = 0;
+		var->blue.length = 5;
+		break;
+	case 16:
+		var->red.offset = 11;
+		var->red.length = 5;
+		var->green.offset = 5;
+		var->green.length = 6;
+		var->blue.offset = 0;
+		var->blue.length = 5;
+		break;
+	case 18:
+		var->red.offset = 16;
+		var->red.length = 6;
+		var->green.offset = 8;
+		var->green.length = 6;
+		var->blue.offset = 0;
+		var->blue.length = 6;
+		var->bits_per_pixel = 32;
+		break;
+	case 32:
+	case 24:
+		var->transp.offset = 24;
+		var->transp.length = 8;
+		var->red.offset = 16;
+		var->red.length = 8;
+		var->green.offset = 8;
+		var->green.length = 8;
+		var->blue.offset = 0;
+		var->blue.length = 8;
+		var->bits_per_pixel = 32;
+		break;
+	default:
+		break;
+	}
+
+	return 0;
+}
+
+static int jzfb_set_par(struct fb_info *info)
+{
+	struct jzfb *jzfb = info->par;
+	struct jz4740_fb_platform_data *pdata = jzfb->pdata;
+	struct fb_var_screeninfo *var = &info->var;
+	struct fb_videomode *mode;
+	uint16_t hds, vds;
+	uint16_t hde, vde;
+	uint16_t ht, vt;
+	uint32_t ctrl;
+	uint32_t cfg;
+	unsigned long rate;
+
+	mode = jzfb_get_mode(jzfb, var);
+	if (mode == NULL)
+		return -EINVAL;
+
+	if (mode == info->mode)
+		return 0;
+
+	info->mode = mode;
+
+	hds = mode->hsync_len + mode->left_margin;
+	hde = hds + mode->xres;
+	ht = hde + mode->right_margin;
+
+	vds = mode->vsync_len + mode->upper_margin;
+	vde = vds + mode->yres;
+	vt = vde + mode->lower_margin;
+
+	ctrl = JZ_LCD_CTRL_OFUP | JZ_LCD_CTRL_BURST_16;
+
+	switch (pdata->bpp) {
+	case 1:
+		ctrl |= JZ_LCD_CTRL_BPP_1;
+		break;
+	case 2:
+		ctrl |= JZ_LCD_CTRL_BPP_2;
+		break;
+	case 4:
+		ctrl |= JZ_LCD_CTRL_BPP_4;
+		break;
+	case 8:
+		ctrl |= JZ_LCD_CTRL_BPP_8;
+	break;
+	case 15:
+		ctrl |= JZ_LCD_CTRL_RGB555; /* Falltrough */
+	case 16:
+		ctrl |= JZ_LCD_CTRL_BPP_15_16;
+		break;
+	case 18:
+	case 24:
+	case 32:
+		ctrl |= JZ_LCD_CTRL_BPP_18_24;
+		break;
+	default:
+		break;
+	}
+
+	cfg = pdata->lcd_type & 0xf;
+
+	if (!(mode->sync & FB_SYNC_HOR_HIGH_ACT))
+		cfg |= JZ_LCD_CFG_HSYNC_ACTIVE_LOW;
+
+	if (!(mode->sync & FB_SYNC_VERT_HIGH_ACT))
+		cfg |= JZ_LCD_CFG_VSYNC_ACTIVE_LOW;
+
+	if (pdata->pixclk_falling_edge)
+		cfg |= JZ_LCD_CFG_PCLK_FALLING_EDGE;
+
+	if (pdata->date_enable_active_low)
+		cfg |= JZ_LCD_CFG_DE_ACTIVE_LOW;
+
+	if (pdata->lcd_type == JZ_LCD_TYPE_GENERIC_18_BIT)
+		cfg |= JZ_LCD_CFG_18_BIT;
+
+	if (mode->pixclock) {
+		rate = PICOS2KHZ(mode->pixclock) * 1000;
+		mode->refresh = rate / vt / ht;
+	} else {
+		if (pdata->lcd_type == JZ_LCD_TYPE_8BIT_SERIAL)
+			rate = mode->refresh * (vt + 2 * mode->xres) * ht;
+		else
+			rate = mode->refresh * vt * ht;
+
+		mode->pixclock = KHZ2PICOS(rate / 1000);
+	}
+
+	mutex_lock(&jzfb->lock);
+	if (!jzfb->is_enabled)
+		clk_enable(jzfb->ldclk);
+	else
+		ctrl |= JZ_LCD_CTRL_ENABLE;
+
+	switch (pdata->lcd_type) {
+	case JZ_LCD_TYPE_SPECIAL_TFT_1:
+	case JZ_LCD_TYPE_SPECIAL_TFT_2:
+	case JZ_LCD_TYPE_SPECIAL_TFT_3:
+		writel(pdata->special_tft_config.spl, jzfb->base + JZ_REG_LCD_SPL);
+		writel(pdata->special_tft_config.cls, jzfb->base + JZ_REG_LCD_CLS);
+		writel(pdata->special_tft_config.ps, jzfb->base + JZ_REG_LCD_PS);
+		writel(pdata->special_tft_config.ps, jzfb->base + JZ_REG_LCD_REV);
+		break;
+	default:
+		cfg |= JZ_LCD_CFG_PS_DISABLE;
+		cfg |= JZ_LCD_CFG_CLS_DISABLE;
+		cfg |= JZ_LCD_CFG_SPL_DISABLE;
+		cfg |= JZ_LCD_CFG_REV_DISABLE;
+		break;
+	}
+
+	writel(mode->hsync_len, jzfb->base + JZ_REG_LCD_HSYNC);
+	writel(mode->vsync_len, jzfb->base + JZ_REG_LCD_VSYNC);
+
+	writel((ht << 16) | vt, jzfb->base + JZ_REG_LCD_VAT);
+
+	writel((hds << 16) | hde, jzfb->base + JZ_REG_LCD_DAH);
+	writel((vds << 16) | vde, jzfb->base + JZ_REG_LCD_DAV);
+
+	writel(cfg, jzfb->base + JZ_REG_LCD_CFG);
+
+	writel(ctrl, jzfb->base + JZ_REG_LCD_CTRL);
+
+	if (!jzfb->is_enabled)
+		clk_disable(jzfb->ldclk);
+
+	mutex_unlock(&jzfb->lock);
+
+	clk_set_rate(jzfb->lpclk, rate);
+	clk_set_rate(jzfb->ldclk, rate * 3);
+
+	return 0;
+}
+
+static void jzfb_enable(struct jzfb *jzfb)
+{
+	uint32_t ctrl;
+
+	clk_enable(jzfb->ldclk);
+
+	jz_gpio_bulk_resume(jz_lcd_ctrl_pins, jzfb_num_ctrl_pins(jzfb));
+	jz_gpio_bulk_resume(jz_lcd_data_pins, jzfb_num_data_pins(jzfb));
+
+	writel(0, jzfb->base + JZ_REG_LCD_STATE);
+
+	writel(jzfb->framedesc->next, jzfb->base + JZ_REG_LCD_DA0);
+
+	ctrl = readl(jzfb->base + JZ_REG_LCD_CTRL);
+	ctrl |= JZ_LCD_CTRL_ENABLE;
+	ctrl &= ~JZ_LCD_CTRL_DISABLE;
+	writel(ctrl, jzfb->base + JZ_REG_LCD_CTRL);
+}
+
+static void jzfb_disable(struct jzfb *jzfb)
+{
+	uint32_t ctrl;
+
+	ctrl = readl(jzfb->base + JZ_REG_LCD_CTRL);
+	ctrl |= JZ_LCD_CTRL_DISABLE;
+	writel(ctrl, jzfb->base + JZ_REG_LCD_CTRL);
+	do {
+		ctrl = readl(jzfb->base + JZ_REG_LCD_STATE);
+	} while (!(ctrl & JZ_LCD_STATE_DISABLED));
+
+	jz_gpio_bulk_suspend(jz_lcd_ctrl_pins, jzfb_num_ctrl_pins(jzfb));
+	jz_gpio_bulk_suspend(jz_lcd_data_pins, jzfb_num_data_pins(jzfb));
+
+	clk_disable(jzfb->ldclk);
+}
+
+static int jzfb_blank(int blank_mode, struct fb_info *info)
+{
+	struct jzfb *jzfb = info->par;
+
+	switch (blank_mode) {
+	case FB_BLANK_UNBLANK:
+		mutex_lock(&jzfb->lock);
+		if (jzfb->is_enabled) {
+			mutex_unlock(&jzfb->lock);
+			return 0;
+		}
+
+		jzfb_enable(jzfb);
+		jzfb->is_enabled = 1;
+
+		mutex_unlock(&jzfb->lock);
+		break;
+	default:
+		mutex_lock(&jzfb->lock);
+		if (!jzfb->is_enabled) {
+			mutex_unlock(&jzfb->lock);
+			return 0;
+		}
+
+		jzfb_disable(jzfb);
+		jzfb->is_enabled = 0;
+
+		mutex_unlock(&jzfb->lock);
+		break;
+	}
+
+	return 0;
+}
+
+static int jzfb_alloc_devmem(struct jzfb *jzfb)
+{
+	int max_videosize = 0;
+	struct fb_videomode *mode = jzfb->pdata->modes;
+	void *page;
+	int i;
+
+	for (i = 0; i < jzfb->pdata->num_modes; ++mode, ++i) {
+		if (max_videosize < mode->xres * mode->yres)
+			max_videosize = mode->xres * mode->yres;
+	}
+
+	max_videosize *= jzfb_get_controller_bpp(jzfb) >> 3;
+
+	jzfb->framedesc = dma_alloc_coherent(&jzfb->pdev->dev,
+					sizeof(*jzfb->framedesc),
+					&jzfb->framedesc_phys, GFP_KERNEL);
+
+	if (!jzfb->framedesc)
+		return -ENOMEM;
+
+	jzfb->vidmem_size = PAGE_ALIGN(max_videosize);
+	jzfb->vidmem = dma_alloc_coherent(&jzfb->pdev->dev,
+					jzfb->vidmem_size,
+					&jzfb->vidmem_phys, GFP_KERNEL);
+
+	if (!jzfb->vidmem)
+		goto err_free_framedesc;
+
+	for (page = jzfb->vidmem;
+		 page < jzfb->vidmem + PAGE_ALIGN(jzfb->vidmem_size);
+		 page += PAGE_SIZE) {
+		SetPageReserved(virt_to_page(page));
+	}
+
+	jzfb->framedesc->next = jzfb->framedesc_phys;
+	jzfb->framedesc->addr = jzfb->vidmem_phys;
+	jzfb->framedesc->id = 0xdeafbead;
+	jzfb->framedesc->cmd = 0;
+	jzfb->framedesc->cmd |= max_videosize / 4;
+
+	return 0;
+
+err_free_framedesc:
+	dma_free_coherent(&jzfb->pdev->dev, sizeof(*jzfb->framedesc),
+				jzfb->framedesc, jzfb->framedesc_phys);
+	return -ENOMEM;
+}
+
+static void jzfb_free_devmem(struct jzfb *jzfb)
+{
+	dma_free_coherent(&jzfb->pdev->dev, jzfb->vidmem_size,
+				jzfb->vidmem, jzfb->vidmem_phys);
+	dma_free_coherent(&jzfb->pdev->dev, sizeof(*jzfb->framedesc),
+				jzfb->framedesc, jzfb->framedesc_phys);
+}
+
+static struct  fb_ops jzfb_ops = {
+	.owner = THIS_MODULE,
+	.fb_check_var = jzfb_check_var,
+	.fb_set_par = jzfb_set_par,
+	.fb_blank = jzfb_blank,
+	.fb_fillrect	= sys_fillrect,
+	.fb_copyarea	= sys_copyarea,
+	.fb_imageblit	= sys_imageblit,
+	.fb_setcolreg = jzfb_setcolreg,
+};
+
+static int __devinit jzfb_probe(struct platform_device *pdev)
+{
+	int ret;
+	struct jzfb *jzfb;
+	struct fb_info *fb;
+	struct jz4740_fb_platform_data *pdata = pdev->dev.platform_data;
+	struct resource *mem;
+
+	if (!pdata) {
+		dev_err(&pdev->dev, "Missing platform data\n");
+		return -ENXIO;
+	}
+
+	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!mem) {
+		dev_err(&pdev->dev, "Failed to get register memory resource\n");
+		return -ENXIO;
+	}
+
+	mem = request_mem_region(mem->start, resource_size(mem), pdev->name);
+	if (!mem) {
+		dev_err(&pdev->dev, "Failed to request register memory region\n");
+		return -EBUSY;
+	}
+
+	fb = framebuffer_alloc(sizeof(struct jzfb), &pdev->dev);
+	if (!fb) {
+		dev_err(&pdev->dev, "Failed to allocate framebuffer device\n");
+		ret = -ENOMEM;
+		goto err_release_mem_region;
+	}
+
+	fb->fbops = &jzfb_ops;
+	fb->flags = FBINFO_DEFAULT;
+
+	jzfb = fb->par;
+	jzfb->pdev = pdev;
+	jzfb->pdata = pdata;
+	jzfb->mem = mem;
+
+	jzfb->ldclk = clk_get(&pdev->dev, "lcd");
+	if (IS_ERR(jzfb->ldclk)) {
+		ret = PTR_ERR(jzfb->ldclk);
+		dev_err(&pdev->dev, "Failed to get lcd clock: %d\n", ret);
+		goto err_framebuffer_release;
+	}
+
+	jzfb->lpclk = clk_get(&pdev->dev, "lcd_pclk");
+	if (IS_ERR(jzfb->lpclk)) {
+		ret = PTR_ERR(jzfb->lpclk);
+		dev_err(&pdev->dev, "Failed to get lcd pixel clock: %d\n", ret);
+		goto err_put_ldclk;
+	}
+
+	jzfb->base = ioremap(mem->start, resource_size(mem));
+	if (!jzfb->base) {
+		dev_err(&pdev->dev, "Failed to ioremap register memory region\n");
+		ret = -EBUSY;
+		goto err_put_lpclk;
+	}
+
+	platform_set_drvdata(pdev, jzfb);
+
+	mutex_init(&jzfb->lock);
+
+	fb_videomode_to_modelist(pdata->modes, pdata->num_modes,
+				 &fb->modelist);
+	fb_videomode_to_var(&fb->var, pdata->modes);
+	fb->var.bits_per_pixel = pdata->bpp;
+	jzfb_check_var(&fb->var, fb);
+
+	ret = jzfb_alloc_devmem(jzfb);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to allocate video memory\n");
+		goto err_iounmap;
+	}
+
+	fb->fix = jzfb_fix;
+	fb->fix.line_length = fb->var.bits_per_pixel * fb->var.xres / 8;
+	fb->fix.mmio_start = mem->start;
+	fb->fix.mmio_len = resource_size(mem);
+	fb->fix.smem_start = jzfb->vidmem_phys;
+	fb->fix.smem_len =  fb->fix.line_length * fb->var.yres;
+	fb->screen_base = jzfb->vidmem;
+	fb->pseudo_palette = jzfb->pseudo_palette;
+
+	fb_alloc_cmap(&fb->cmap, 256, 0);
+
+	clk_enable(jzfb->ldclk);
+	jzfb->is_enabled = 1;
+
+	writel(jzfb->framedesc->next, jzfb->base + JZ_REG_LCD_DA0);
+
+	fb->mode = NULL;
+	jzfb_set_par(fb);
+
+	jz_gpio_bulk_request(jz_lcd_ctrl_pins, jzfb_num_ctrl_pins(jzfb));
+	jz_gpio_bulk_request(jz_lcd_data_pins, jzfb_num_data_pins(jzfb));
+
+	ret = register_framebuffer(fb);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to register framebuffer: %d\n", ret);
+		goto err_free_devmem;
+	}
+
+	jzfb->fb = fb;
+
+	return 0;
+
+err_free_devmem:
+	jz_gpio_bulk_free(jz_lcd_ctrl_pins, jzfb_num_ctrl_pins(jzfb));
+	jz_gpio_bulk_free(jz_lcd_data_pins, jzfb_num_data_pins(jzfb));
+
+	fb_dealloc_cmap(&fb->cmap);
+	jzfb_free_devmem(jzfb);
+err_iounmap:
+	iounmap(jzfb->base);
+err_put_lpclk:
+	clk_put(jzfb->lpclk);
+err_put_ldclk:
+	clk_put(jzfb->ldclk);
+err_framebuffer_release:
+	framebuffer_release(fb);
+err_release_mem_region:
+	release_mem_region(mem->start, resource_size(mem));
+	return ret;
+}
+
+static int __devexit jzfb_remove(struct platform_device *pdev)
+{
+	struct jzfb *jzfb = platform_get_drvdata(pdev);
+
+	jzfb_blank(FB_BLANK_POWERDOWN, jzfb->fb);
+
+	jz_gpio_bulk_free(jz_lcd_ctrl_pins, jzfb_num_ctrl_pins(jzfb));
+	jz_gpio_bulk_free(jz_lcd_data_pins, jzfb_num_data_pins(jzfb));
+
+	iounmap(jzfb->base);
+	release_mem_region(jzfb->mem->start, resource_size(jzfb->mem));
+
+	fb_dealloc_cmap(&jzfb->fb->cmap);
+	jzfb_free_devmem(jzfb);
+
+	platform_set_drvdata(pdev, NULL);
+
+	clk_put(jzfb->lpclk);
+	clk_put(jzfb->ldclk);
+
+	framebuffer_release(jzfb->fb);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM
+
+static int jzfb_suspend(struct device *dev)
+{
+	struct jzfb *jzfb = dev_get_drvdata(dev);
+
+	acquire_console_sem();
+	fb_set_suspend(jzfb->fb, 1);
+	release_console_sem();
+
+	mutex_lock(&jzfb->lock);
+	if (jzfb->is_enabled)
+		jzfb_disable(jzfb);
+	mutex_unlock(&jzfb->lock);
+
+	return 0;
+}
+
+static int jzfb_resume(struct device *dev)
+{
+	struct jzfb *jzfb = dev_get_drvdata(dev);
+	clk_enable(jzfb->ldclk);
+
+	mutex_lock(&jzfb->lock);
+	if (jzfb->is_enabled)
+		jzfb_enable(jzfb);
+	mutex_unlock(&jzfb->lock);
+
+	acquire_console_sem();
+	fb_set_suspend(jzfb->fb, 0);
+	release_console_sem();
+
+	return 0;
+}
+
+static const struct dev_pm_ops jzfb_pm_ops = {
+	.suspend	= jzfb_suspend,
+	.resume		= jzfb_resume,
+	.poweroff	= jzfb_suspend,
+	.restore	= jzfb_resume,
+};
+
+#define JZFB_PM_OPS (&jzfb_pm_ops)
+
+#else
+#define JZFB_PM_OPS NULL
+#endif
+
+static struct platform_driver jzfb_driver = {
+	.probe = jzfb_probe,
+	.remove = __devexit_p(jzfb_remove),
+	.driver = {
+		.name = "jz4740-fb",
+		.pm = JZFB_PM_OPS,
+	},
+};
+
+static int __init jzfb_init(void)
+{
+	return platform_driver_register(&jzfb_driver);
+}
+module_init(jzfb_init);
+
+static void __exit jzfb_exit(void)
+{
+	platform_driver_unregister(&jzfb_driver);
+}
+module_exit(jzfb_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
+MODULE_DESCRIPTION("JZ4740 SoC LCD framebuffer driver");
+MODULE_ALIAS("platform:jz4740-fb");