[PATCH] fbdev: Add framebuffer and display update module support for pnx4008

Add support for Display Update Module and RGB framebuffer device on Philips
PNX4008 ARM board.

Signed-off-by: Grigory Tolstolytkin <gtolstolytkin@ru.mvista.com>
Signed-off-by: Vitaly Wool <vitalywool@gmail.com>
Signed-off-by: Antonino Daplas <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 872 insertions, 0 deletions

diff --git a/drivers/video/pnx4008/sdum.c b/drivers/video/pnx4008/sdum.c
new file mode 100644
index 00000000000..51f0ecc2a51
--- /dev/null
+++ b/drivers/video/pnx4008/sdum.c
@@ -0,0 +1,872 @@
+/*
+ * drivers/video/pnx4008/sdum.c
+ *
+ * Display Update Master support
+ *
+ * Authors: Grigory Tolstolytkin <gtolstolytkin@ru.mvista.com>
+ *          Vitaly Wool <vitalywool@gmail.com>
+ * Based on Philips Semiconductors's code
+ *
+ * Copyrght (c) 2005-2006 MontaVista Software, Inc.
+ * Copyright (c) 2005 Philips Semiconductors
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2. This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ */
+
+#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/vmalloc.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/fb.h>
+#include <linux/init.h>
+#include <linux/dma-mapping.h>
+#include <linux/clk.h>
+#include <asm/uaccess.h>
+#include <asm/arch/gpio.h>
+
+#include "sdum.h"
+#include "fbcommon.h"
+#include "dum.h"
+
+/* Framebuffers we have */
+
+static struct pnx4008_fb_addr {
+	int fb_type;
+	long addr_offset;
+	long fb_length;
+} fb_addr[] = {
+	[0] = {
+		FB_TYPE_YUV, 0, 0xB0000
+	},
+	[1] = {
+		FB_TYPE_RGB, 0xB0000, 0x50000
+	},
+};
+
+static struct dum_data {
+	u32 lcd_phys_start;
+	u32 lcd_virt_start;
+	u32 slave_phys_base;
+	u32 *slave_virt_base;
+	int fb_owning_channel[MAX_DUM_CHANNELS];
+	struct dumchannel_uf chan_uf_store[MAX_DUM_CHANNELS];
+} dum_data;
+
+/* Different local helper functions */
+
+static u32 nof_pixels_dx(struct dum_ch_setup *ch_setup)
+{
+	return (ch_setup->xmax - ch_setup->xmin + 1);
+}
+
+static u32 nof_pixels_dy(struct dum_ch_setup *ch_setup)
+{
+	return (ch_setup->ymax - ch_setup->ymin + 1);
+}
+
+static u32 nof_pixels_dxy(struct dum_ch_setup *ch_setup)
+{
+	return (nof_pixels_dx(ch_setup) * nof_pixels_dy(ch_setup));
+}
+
+static u32 nof_bytes(struct dum_ch_setup *ch_setup)
+{
+	u32 r = nof_pixels_dxy(ch_setup);
+	switch (ch_setup->format) {
+	case RGB888:
+	case RGB666:
+		r *= 4;
+		break;
+
+	default:
+		r *= 2;
+		break;
+	}
+	return r;
+}
+
+static u32 build_command(int disp_no, u32 reg, u32 val)
+{
+	return ((disp_no << 26) | BIT(25) | (val << 16) | (disp_no << 10) |
+		(reg << 0));
+}
+
+static u32 build_double_index(int disp_no, u32 val)
+{
+	return ((disp_no << 26) | (val << 16) | (disp_no << 10) | (val << 0));
+}
+
+static void build_disp_window(struct dum_ch_setup * ch_setup, struct disp_window * dw)
+{
+	dw->ymin = ch_setup->ymin;
+	dw->ymax = ch_setup->ymax;
+	dw->xmin_l = ch_setup->xmin & 0xFF;
+	dw->xmin_h = (ch_setup->xmin & BIT(8)) >> 8;
+	dw->xmax_l = ch_setup->xmax & 0xFF;
+	dw->xmax_h = (ch_setup->xmax & BIT(8)) >> 8;
+}
+
+static int put_channel(struct dumchannel chan)
+{
+	int i = chan.channelnr;
+
+	if (i < 0 || i > MAX_DUM_CHANNELS)
+		return -EINVAL;
+	else {
+		DUM_CH_MIN(i) = chan.dum_ch_min;
+		DUM_CH_MAX(i) = chan.dum_ch_max;
+		DUM_CH_CONF(i) = chan.dum_ch_conf;
+		DUM_CH_CTRL(i) = chan.dum_ch_ctrl;
+	}
+
+	return 0;
+}
+
+static void clear_channel(int channr)
+{
+	struct dumchannel chan;
+
+	chan.channelnr = channr;
+	chan.dum_ch_min = 0;
+	chan.dum_ch_max = 0;
+	chan.dum_ch_conf = 0;
+	chan.dum_ch_ctrl = 0;
+
+	put_channel(chan);
+}
+
+static int put_cmd_string(struct cmdstring cmds)
+{
+	u16 *cmd_str_virtaddr;
+	u32 *cmd_ptr0_virtaddr;
+	u32 cmd_str_physaddr;
+
+	int i = cmds.channelnr;
+
+	if (i < 0 || i > MAX_DUM_CHANNELS)
+		return -EINVAL;
+	else if ((cmd_ptr0_virtaddr =
+		  (int *)ioremap_nocache(DUM_COM_BASE,
+					 sizeof(int) * MAX_DUM_CHANNELS)) ==
+		 NULL)
+		return -EIOREMAPFAILED;
+	else {
+		cmd_str_physaddr = ioread32(&cmd_ptr0_virtaddr[cmds.channelnr]);
+		if ((cmd_str_virtaddr =
+		     (u16 *) ioremap_nocache(cmd_str_physaddr,
+					     sizeof(cmds))) == NULL) {
+			iounmap(cmd_ptr0_virtaddr);
+			return -EIOREMAPFAILED;
+		} else {
+			int t;
+			for (t = 0; t < 8; t++)
+				iowrite16(*((u16 *)&cmds.prestringlen + t),
+					  cmd_str_virtaddr + t);
+
+			for (t = 0; t < cmds.prestringlen / 2; t++)
+				 iowrite16(*((u16 *)&cmds.precmd + t),
+					   cmd_str_virtaddr + t + 8);
+
+			for (t = 0; t < cmds.poststringlen / 2; t++)
+				iowrite16(*((u16 *)&cmds.postcmd + t),
+					  cmd_str_virtaddr + t + 8 +
+					  	cmds.prestringlen / 2);
+
+			iounmap(cmd_ptr0_virtaddr);
+			iounmap(cmd_str_virtaddr);
+		}
+	}
+
+	return 0;
+}
+
+static u32 dum_ch_setup(int ch_no, struct dum_ch_setup * ch_setup)
+{
+	struct cmdstring cmds_c;
+	struct cmdstring *cmds = &cmds_c;
+	struct disp_window dw;
+	int standard;
+	u32 orientation = 0;
+	struct dumchannel chan = { 0 };
+	int ret;
+
+	if ((ch_setup->xmirror) || (ch_setup->ymirror) || (ch_setup->rotate)) {
+		standard = 0;
+
+		orientation = BIT(1);	/* always set 9-bit-bus */
+		if (ch_setup->xmirror)
+			orientation |= BIT(4);
+		if (ch_setup->ymirror)
+			orientation |= BIT(3);
+		if (ch_setup->rotate)
+			orientation |= BIT(0);
+	} else
+		standard = 1;
+
+	cmds->channelnr = ch_no;
+
+	/* build command string header */
+	if (standard) {
+		cmds->prestringlen = 32;
+		cmds->poststringlen = 0;
+	} else {
+		cmds->prestringlen = 48;
+		cmds->poststringlen = 16;
+	}
+
+	cmds->format =
+	    (u16) ((ch_setup->disp_no << 4) | (BIT(3)) | (ch_setup->format));
+	cmds->reserved = 0x0;
+	cmds->startaddr_low = (ch_setup->minadr & 0xFFFF);
+	cmds->startaddr_high = (ch_setup->minadr >> 16);
+
+	if ((ch_setup->minadr == 0) && (ch_setup->maxadr == 0)
+	    && (ch_setup->xmin == 0)
+	    && (ch_setup->ymin == 0) && (ch_setup->xmax == 0)
+	    && (ch_setup->ymax == 0)) {
+		cmds->pixdatlen_low = 0;
+		cmds->pixdatlen_high = 0;
+	} else {
+		u32 nbytes = nof_bytes(ch_setup);
+		cmds->pixdatlen_low = (nbytes & 0xFFFF);
+		cmds->pixdatlen_high = (nbytes >> 16);
+	}
+
+	if (ch_setup->slave_trans)
+		cmds->pixdatlen_high |= BIT(15);
+
+	/* build pre-string */
+	build_disp_window(ch_setup, &dw);
+
+	if (standard) {
+		cmds->precmd[0] =
+		    build_command(ch_setup->disp_no, DISP_XMIN_L_REG, 0x99);
+		cmds->precmd[1] =
+		    build_command(ch_setup->disp_no, DISP_XMIN_L_REG,
+				  dw.xmin_l);
+		cmds->precmd[2] =
+		    build_command(ch_setup->disp_no, DISP_XMIN_H_REG,
+				  dw.xmin_h);
+		cmds->precmd[3] =
+		    build_command(ch_setup->disp_no, DISP_YMIN_REG, dw.ymin);
+		cmds->precmd[4] =
+		    build_command(ch_setup->disp_no, DISP_XMAX_L_REG,
+				  dw.xmax_l);
+		cmds->precmd[5] =
+		    build_command(ch_setup->disp_no, DISP_XMAX_H_REG,
+				  dw.xmax_h);
+		cmds->precmd[6] =
+		    build_command(ch_setup->disp_no, DISP_YMAX_REG, dw.ymax);
+		cmds->precmd[7] =
+		    build_double_index(ch_setup->disp_no, DISP_PIXEL_REG);
+	} else {
+		if (dw.xmin_l == ch_no)
+			cmds->precmd[0] =
+			    build_command(ch_setup->disp_no, DISP_XMIN_L_REG,
+					  0x99);
+		else
+			cmds->precmd[0] =
+			    build_command(ch_setup->disp_no, DISP_XMIN_L_REG,
+					  ch_no);
+
+		cmds->precmd[1] =
+		    build_command(ch_setup->disp_no, DISP_XMIN_L_REG,
+				  dw.xmin_l);
+		cmds->precmd[2] =
+		    build_command(ch_setup->disp_no, DISP_XMIN_H_REG,
+				  dw.xmin_h);
+		cmds->precmd[3] =
+		    build_command(ch_setup->disp_no, DISP_YMIN_REG, dw.ymin);
+		cmds->precmd[4] =
+		    build_command(ch_setup->disp_no, DISP_XMAX_L_REG,
+				  dw.xmax_l);
+		cmds->precmd[5] =
+		    build_command(ch_setup->disp_no, DISP_XMAX_H_REG,
+				  dw.xmax_h);
+		cmds->precmd[6] =
+		    build_command(ch_setup->disp_no, DISP_YMAX_REG, dw.ymax);
+		cmds->precmd[7] =
+		    build_command(ch_setup->disp_no, DISP_1_REG, orientation);
+		cmds->precmd[8] =
+		    build_double_index(ch_setup->disp_no, DISP_PIXEL_REG);
+		cmds->precmd[9] =
+		    build_double_index(ch_setup->disp_no, DISP_PIXEL_REG);
+		cmds->precmd[0xA] =
+		    build_double_index(ch_setup->disp_no, DISP_PIXEL_REG);
+		cmds->precmd[0xB] =
+		    build_double_index(ch_setup->disp_no, DISP_PIXEL_REG);
+		cmds->postcmd[0] =
+		    build_command(ch_setup->disp_no, DISP_1_REG, BIT(1));
+		cmds->postcmd[1] =
+		    build_command(ch_setup->disp_no, DISP_DUMMY1_REG, 1);
+		cmds->postcmd[2] =
+		    build_command(ch_setup->disp_no, DISP_DUMMY1_REG, 2);
+		cmds->postcmd[3] =
+		    build_command(ch_setup->disp_no, DISP_DUMMY1_REG, 3);
+	}
+
+	if ((ret = put_cmd_string(cmds_c)) != 0) {
+		return ret;
+	}
+
+	chan.channelnr = cmds->channelnr;
+	chan.dum_ch_min = ch_setup->dirtybuffer + ch_setup->minadr;
+	chan.dum_ch_max = ch_setup->dirtybuffer + ch_setup->maxadr;
+	chan.dum_ch_conf = 0x002;
+	chan.dum_ch_ctrl = 0x04;
+
+	put_channel(chan);
+
+	return 0;
+}
+
+static u32 display_open(int ch_no, int auto_update, u32 * dirty_buffer,
+			u32 * frame_buffer, u32 xpos, u32 ypos, u32 w, u32 h)
+{
+
+	struct dum_ch_setup k;
+	int ret;
+
+	/* keep width & height within display area */
+	if ((xpos + w) > DISP_MAX_X_SIZE)
+		w = DISP_MAX_X_SIZE - xpos;
+
+	if ((ypos + h) > DISP_MAX_Y_SIZE)
+		h = DISP_MAX_Y_SIZE - ypos;
+
+	/* assume 1 display only */
+	k.disp_no = 0;
+	k.xmin = xpos;
+	k.ymin = ypos;
+	k.xmax = xpos + (w - 1);
+	k.ymax = ypos + (h - 1);
+
+	/* adjust min and max values if necessary */
+	if (k.xmin > DISP_MAX_X_SIZE - 1)
+		k.xmin = DISP_MAX_X_SIZE - 1;
+	if (k.ymin > DISP_MAX_Y_SIZE - 1)
+		k.ymin = DISP_MAX_Y_SIZE - 1;
+
+	if (k.xmax > DISP_MAX_X_SIZE - 1)
+		k.xmax = DISP_MAX_X_SIZE - 1;
+	if (k.ymax > DISP_MAX_Y_SIZE - 1)
+		k.ymax = DISP_MAX_Y_SIZE - 1;
+
+	k.xmirror = 0;
+	k.ymirror = 0;
+	k.rotate = 0;
+	k.minadr = (u32) frame_buffer;
+	k.maxadr = (u32) frame_buffer + (((w - 1) << 10) | ((h << 2) - 2));
+	k.pad = PAD_1024;
+	k.dirtybuffer = (u32) dirty_buffer;
+	k.format = RGB888;
+	k.hwdirty = 0;
+	k.slave_trans = 0;
+
+	ret = dum_ch_setup(ch_no, &k);
+
+	return ret;
+}
+
+static void lcd_reset(void)
+{
+	u32 *dum_pio_base = (u32 *)IO_ADDRESS(PNX4008_PIO_BASE);
+
+	udelay(1);
+	iowrite32(BIT(19), &dum_pio_base[2]);
+	udelay(1);
+	iowrite32(BIT(19), &dum_pio_base[1]);
+	udelay(1);
+}
+
+static int dum_init(struct platform_device *pdev)
+{
+	struct clk *clk;
+
+	/* enable DUM clock */
+	clk = clk_get(&pdev->dev, "dum_ck");
+	if (IS_ERR(clk)) {
+		printk(KERN_ERR "pnx4008_dum: Unable to access DUM clock\n");
+		return PTR_ERR(clk);
+	}
+
+	clk_set_rate(clk, 1);
+	clk_put(clk);
+
+	DUM_CTRL = V_DUM_RESET;
+
+	/* set priority to "round-robin". All other params to "false" */
+	DUM_CONF = BIT(9);
+
+	/* Display 1 */
+	DUM_WTCFG1 = PNX4008_DUM_WT_CFG;
+	DUM_RTCFG1 = PNX4008_DUM_RT_CFG;
+	DUM_TCFG = PNX4008_DUM_T_CFG;
+
+	return 0;
+}
+
+static void dum_chan_init(void)
+{
+	int i = 0, ch = 0;
+	u32 *cmdptrs;
+	u32 *cmdstrings;
+
+	DUM_COM_BASE =
+		CMDSTRING_BASEADDR + BYTES_PER_CMDSTRING * NR_OF_CMDSTRINGS;
+
+	if ((cmdptrs =
+	     (u32 *) ioremap_nocache(DUM_COM_BASE,
+				     sizeof(u32) * NR_OF_CMDSTRINGS)) == NULL)
+		return;
+
+	for (ch = 0; ch < NR_OF_CMDSTRINGS; ch++)
+		iowrite32(CMDSTRING_BASEADDR + BYTES_PER_CMDSTRING * ch,
+			  cmdptrs + ch);
+
+	for (ch = 0; ch < MAX_DUM_CHANNELS; ch++)
+		clear_channel(ch);
+
+	/* Clear the cmdstrings */
+	cmdstrings =
+	    (u32 *)ioremap_nocache(*cmdptrs,
+				   BYTES_PER_CMDSTRING * NR_OF_CMDSTRINGS);
+
+	if (!cmdstrings)
+		goto out;
+
+	for (i = 0; i < NR_OF_CMDSTRINGS * BYTES_PER_CMDSTRING / sizeof(u32);
+	     i++)
+		iowrite32(0, cmdstrings + i);
+
+	iounmap((u32 *)cmdstrings);
+
+out:
+	iounmap((u32 *)cmdptrs);
+}
+
+static void lcd_init(void)
+{
+	lcd_reset();
+
+	DUM_OUTP_FORMAT1 = 0; /* RGB666 */
+
+	udelay(1);
+	iowrite32(V_LCD_STANDBY_OFF, dum_data.slave_virt_base);
+	udelay(1);
+	iowrite32(V_LCD_USE_9BIT_BUS, dum_data.slave_virt_base);
+	udelay(1);
+	iowrite32(V_LCD_SYNC_RISE_L, dum_data.slave_virt_base);
+	udelay(1);
+	iowrite32(V_LCD_SYNC_RISE_H, dum_data.slave_virt_base);
+	udelay(1);
+	iowrite32(V_LCD_SYNC_FALL_L, dum_data.slave_virt_base);
+	udelay(1);
+	iowrite32(V_LCD_SYNC_FALL_H, dum_data.slave_virt_base);
+	udelay(1);
+	iowrite32(V_LCD_SYNC_ENABLE, dum_data.slave_virt_base);
+	udelay(1);
+	iowrite32(V_LCD_DISPLAY_ON, dum_data.slave_virt_base);
+	udelay(1);
+}
+
+/* Interface exported to framebuffer drivers */
+
+int pnx4008_get_fb_addresses(int fb_type, void **virt_addr,
+			     dma_addr_t *phys_addr, int *fb_length)
+{
+	int i;
+	int ret = -1;
+	for (i = 0; i < ARRAY_SIZE(fb_addr); i++)
+		if (fb_addr[i].fb_type == fb_type) {
+			*virt_addr = (void *)(dum_data.lcd_virt_start +
+					fb_addr[i].addr_offset);
+			*phys_addr =
+			    dum_data.lcd_phys_start + fb_addr[i].addr_offset;
+			*fb_length = fb_addr[i].fb_length;
+			ret = 0;
+			break;
+		}
+
+	return ret;
+}
+
+EXPORT_SYMBOL(pnx4008_get_fb_addresses);
+
+int pnx4008_alloc_dum_channel(int dev_id)
+{
+	int i = 0;
+
+	while ((i < MAX_DUM_CHANNELS) && (dum_data.fb_owning_channel[i] != -1))
+		i++;
+
+	if (i == MAX_DUM_CHANNELS)
+		return -ENORESOURCESLEFT;
+	else {
+		dum_data.fb_owning_channel[i] = dev_id;
+		return i;
+	}
+}
+
+EXPORT_SYMBOL(pnx4008_alloc_dum_channel);
+
+int pnx4008_free_dum_channel(int channr, int dev_id)
+{
+	if (channr < 0 || channr > MAX_DUM_CHANNELS)
+		return -EINVAL;
+	else if (dum_data.fb_owning_channel[channr] != dev_id)
+		return -EFBNOTOWNER;
+	else {
+		clear_channel(channr);
+		dum_data.fb_owning_channel[channr] = -1;
+	}
+
+	return 0;
+}
+
+EXPORT_SYMBOL(pnx4008_free_dum_channel);
+
+int pnx4008_put_dum_channel_uf(struct dumchannel_uf chan_uf, int dev_id)
+{
+	int i = chan_uf.channelnr;
+	int ret;
+
+	if (i < 0 || i > MAX_DUM_CHANNELS)
+		return -EINVAL;
+	else if (dum_data.fb_owning_channel[i] != dev_id)
+		return -EFBNOTOWNER;
+	else if ((ret =
+		  display_open(chan_uf.channelnr, 0, chan_uf.dirty,
+			       chan_uf.source, chan_uf.y_offset,
+			       chan_uf.x_offset, chan_uf.height,
+			       chan_uf.width)) != 0)
+		return ret;
+	else {
+		dum_data.chan_uf_store[i].dirty = chan_uf.dirty;
+		dum_data.chan_uf_store[i].source = chan_uf.source;
+		dum_data.chan_uf_store[i].x_offset = chan_uf.x_offset;
+		dum_data.chan_uf_store[i].y_offset = chan_uf.y_offset;
+		dum_data.chan_uf_store[i].width = chan_uf.width;
+		dum_data.chan_uf_store[i].height = chan_uf.height;
+	}
+
+	return 0;
+}
+
+EXPORT_SYMBOL(pnx4008_put_dum_channel_uf);
+
+int pnx4008_set_dum_channel_sync(int channr, int val, int dev_id)
+{
+	if (channr < 0 || channr > MAX_DUM_CHANNELS)
+		return -EINVAL;
+	else if (dum_data.fb_owning_channel[channr] != dev_id)
+		return -EFBNOTOWNER;
+	else {
+		if (val == CONF_SYNC_ON) {
+			DUM_CH_CONF(channr) |= CONF_SYNCENABLE;
+			DUM_CH_CONF(channr) |= DUM_CHANNEL_CFG_SYNC_MASK |
+				DUM_CHANNEL_CFG_SYNC_MASK_SET;
+		} else if (val == CONF_SYNC_OFF)
+			DUM_CH_CONF(channr) &= ~CONF_SYNCENABLE;
+		else
+			return -EINVAL;
+	}
+
+	return 0;
+}
+
+EXPORT_SYMBOL(pnx4008_set_dum_channel_sync);
+
+int pnx4008_set_dum_channel_dirty_detect(int channr, int val, int dev_id)
+{
+	if (channr < 0 || channr > MAX_DUM_CHANNELS)
+		return -EINVAL;
+	else if (dum_data.fb_owning_channel[channr] != dev_id)
+		return -EFBNOTOWNER;
+	else {
+		if (val == CONF_DIRTYDETECTION_ON)
+			DUM_CH_CONF(channr) |= CONF_DIRTYENABLE;
+		else if (val == CONF_DIRTYDETECTION_OFF)
+			DUM_CH_CONF(channr) &= ~CONF_DIRTYENABLE;
+		else
+			return -EINVAL;
+	}
+
+	return 0;
+}
+
+EXPORT_SYMBOL(pnx4008_set_dum_channel_dirty_detect);
+
+#if 0 /* Functions not used currently, but likely to be used in future */
+
+static int get_channel(struct dumchannel *p_chan)
+{
+	int i = p_chan->channelnr;
+
+	if (i < 0 || i > MAX_DUM_CHANNELS)
+		return -EINVAL;
+	else {
+		p_chan->dum_ch_min = DUM_CH_MIN(i);
+		p_chan->dum_ch_max = DUM_CH_MAX(i);
+		p_chan->dum_ch_conf = DUM_CH_CONF(i);
+		p_chan->dum_ch_stat = DUM_CH_STAT(i);
+		p_chan->dum_ch_ctrl = 0;	/* WriteOnly control register */
+	}
+
+	return 0;
+}
+
+int pnx4008_get_dum_channel_uf(struct dumchannel_uf *p_chan_uf, int dev_id)
+{
+	int i = p_chan_uf->channelnr;
+
+	if (i < 0 || i > MAX_DUM_CHANNELS)
+		return -EINVAL;
+	else if (dum_data.fb_owning_channel[i] != dev_id)
+		return -EFBNOTOWNER;
+	else {
+		p_chan_uf->dirty = dum_data.chan_uf_store[i].dirty;
+		p_chan_uf->source = dum_data.chan_uf_store[i].source;
+		p_chan_uf->x_offset = dum_data.chan_uf_store[i].x_offset;
+		p_chan_uf->y_offset = dum_data.chan_uf_store[i].y_offset;
+		p_chan_uf->width = dum_data.chan_uf_store[i].width;
+		p_chan_uf->height = dum_data.chan_uf_store[i].height;
+	}
+
+	return 0;
+}
+
+EXPORT_SYMBOL(pnx4008_get_dum_channel_uf);
+
+int pnx4008_get_dum_channel_config(int channr, int dev_id)
+{
+	int ret;
+	struct dumchannel chan;
+
+	if (channr < 0 || channr > MAX_DUM_CHANNELS)
+		return -EINVAL;
+	else if (dum_data.fb_owning_channel[channr] != dev_id)
+		return -EFBNOTOWNER;
+	else {
+		chan.channelnr = channr;
+		if ((ret = get_channel(&chan)) != 0)
+			return ret;
+	}
+
+	return (chan.dum_ch_conf & DUM_CHANNEL_CFG_MASK);
+}
+
+EXPORT_SYMBOL(pnx4008_get_dum_channel_config);
+
+int pnx4008_force_update_dum_channel(int channr, int dev_id)
+{
+	if (channr < 0 || channr > MAX_DUM_CHANNELS)
+		return -EINVAL;
+
+	else if (dum_data.fb_owning_channel[channr] != dev_id)
+		return -EFBNOTOWNER;
+	else
+		DUM_CH_CTRL(channr) = CTRL_SETDIRTY;
+
+	return 0;
+}
+
+EXPORT_SYMBOL(pnx4008_force_update_dum_channel);
+
+#endif
+
+int pnx4008_sdum_mmap(struct fb_info *info, struct vm_area_struct *vma,
+		      struct device *dev)
+{
+	unsigned long off = vma->vm_pgoff << PAGE_SHIFT;
+
+	if (off < info->fix.smem_len) {
+		vma->vm_pgoff += 1;
+		return dma_mmap_writecombine(dev, vma,
+				(void *)dum_data.lcd_virt_start,
+				dum_data.lcd_phys_start,
+				FB_DMA_SIZE);
+	}
+	return -EINVAL;
+}
+
+EXPORT_SYMBOL(pnx4008_sdum_mmap);
+
+int pnx4008_set_dum_exit_notification(int dev_id)
+{
+	int i;
+
+	for (i = 0; i < MAX_DUM_CHANNELS; i++)
+		if (dum_data.fb_owning_channel[i] == dev_id)
+			return -ERESOURCESNOTFREED;
+
+	return 0;
+}
+
+EXPORT_SYMBOL(pnx4008_set_dum_exit_notification);
+
+/* Platform device driver for DUM */
+
+static int sdum_suspend(struct platform_device *pdev, pm_message_t state)
+{
+	int retval = 0;
+	struct clk *clk;
+
+	clk = clk_get(0, "dum_ck");
+	if (!IS_ERR(clk)) {
+		clk_set_rate(clk, 0);
+		clk_put(clk);
+	} else
+		retval = PTR_ERR(clk);
+
+	/* disable BAC */
+	DUM_CTRL = V_BAC_DISABLE_IDLE;
+
+	/* LCD standby & turn off display */
+	lcd_reset();
+
+	return retval;
+}
+
+static int sdum_resume(struct platform_device *pdev)
+{
+	int retval = 0;
+	struct clk *clk;
+
+	clk = clk_get(0, "dum_ck");
+	if (!IS_ERR(clk)) {
+		clk_set_rate(clk, 1);
+		clk_put(clk);
+	} else
+		retval = PTR_ERR(clk);
+
+	/* wait for BAC disable */
+	DUM_CTRL = V_BAC_DISABLE_TRIG;
+
+	while (DUM_CTRL & BAC_ENABLED)
+		udelay(10);
+
+	/* re-init LCD */
+	lcd_init();
+
+	/* enable BAC and reset MUX */
+	DUM_CTRL = V_BAC_ENABLE;
+	udelay(1);
+	DUM_CTRL = V_MUX_RESET;
+	return 0;
+}
+
+static int __devinit sdum_probe(struct platform_device *pdev)
+{
+	int ret = 0, i = 0;
+
+	/* map frame buffer */
+	dum_data.lcd_virt_start = (u32) dma_alloc_writecombine(&pdev->dev,
+						       FB_DMA_SIZE,
+						       &dum_data.lcd_phys_start,
+						       GFP_KERNEL);
+
+	if (!dum_data.lcd_virt_start) {
+		ret = -ENOMEM;
+		goto out_3;
+	}
+
+	/* map slave registers */
+	dum_data.slave_phys_base = PNX4008_DUM_SLAVE_BASE;
+	dum_data.slave_virt_base =
+	    (u32 *) ioremap_nocache(dum_data.slave_phys_base, sizeof(u32));
+
+	if (dum_data.slave_virt_base == NULL) {
+		ret = -ENOMEM;
+		goto out_2;
+	}
+
+	/* initialize DUM and LCD display */
+	ret = dum_init(pdev);
+	if (ret)
+		goto out_1;
+
+	dum_chan_init();
+	lcd_init();
+
+	DUM_CTRL = V_BAC_ENABLE;
+	udelay(1);
+	DUM_CTRL = V_MUX_RESET;
+
+	/* set decode address and sync clock divider */
+	DUM_DECODE = dum_data.lcd_phys_start & DUM_DECODE_MASK;
+	DUM_CLK_DIV = PNX4008_DUM_CLK_DIV;
+
+	for (i = 0; i < MAX_DUM_CHANNELS; i++)
+		dum_data.fb_owning_channel[i] = -1;
+
+	/*setup wakeup interrupt */
+	start_int_set_rising_edge(SE_DISP_SYNC_INT);
+	start_int_ack(SE_DISP_SYNC_INT);
+	start_int_umask(SE_DISP_SYNC_INT);
+
+	return 0;
+
+out_1:
+	iounmap((void *)dum_data.slave_virt_base);
+out_2:
+	dma_free_writecombine(&pdev->dev, FB_DMA_SIZE,
+			(void *)dum_data.lcd_virt_start,
+			dum_data.lcd_phys_start);
+out_3:
+	return ret;
+}
+
+static int sdum_remove(struct platform_device *pdev)
+{
+	struct clk *clk;
+
+	start_int_mask(SE_DISP_SYNC_INT);
+
+	clk = clk_get(0, "dum_ck");
+	if (!IS_ERR(clk)) {
+		clk_set_rate(clk, 0);
+		clk_put(clk);
+	}
+
+	iounmap((void *)dum_data.slave_virt_base);
+
+	dma_free_writecombine(&pdev->dev, FB_DMA_SIZE,
+			(void *)dum_data.lcd_virt_start,
+			dum_data.lcd_phys_start);
+
+	return 0;
+}
+
+static struct platform_driver sdum_driver = {
+	.driver = {
+		.name = "sdum",
+	},
+	.probe = sdum_probe,
+	.remove = sdum_remove,
+	.suspend = sdum_suspend,
+	.resume = sdum_resume,
+};
+
+int __init sdum_init(void)
+{
+	return platform_driver_register(&sdum_driver);
+}
+
+static void __exit sdum_exit(void)
+{
+	platform_driver_unregister(&sdum_driver);
+};
+
+module_init(sdum_init);
+module_exit(sdum_exit);
+
+MODULE_LICENSE("GPL");