omap1: DMA: move LCD related code from plat-omap to mach-omap1

All of the LCD DMA code in plat-omap/dma.c appears to be OMAP1-only (and
apparently only is available on a subset of OMAP1 chips).

Move this code to mach-omap1/lcd_dma.c.

Tested on OMAP1510 Amstrad Delta.
Compile-tested with omap_generic_2420_defconfig.

Reported-by: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>
Reviewed-by: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

3 files changed, 529 insertions, 0 deletions

diff --git a/arch/arm/mach-omap1/Makefile b/arch/arm/mach-omap1/Makefile
index 191e0cf6ee95..9ce17f13d3f1 100644
--- a/arch/arm/mach-omap1/Makefile
+++ b/arch/arm/mach-omap1/Makefile
@@ -52,3 +52,7 @@ led-$(CONFIG_MACH_OMAP_INNOVATOR)	+= leds-innovator.o
 led-$(CONFIG_MACH_OMAP_PERSEUS2)        += leds-h2p2-debug.o
 led-$(CONFIG_MACH_OMAP_OSK)             += leds-osk.o
 obj-$(CONFIG_LEDS)                      += $(led-y)
+
+ifneq ($(CONFIG_FB_OMAP),)
+obj-y += lcd_dma.o
+endif
diff --git a/arch/arm/mach-omap1/include/mach/lcd_dma.h b/arch/arm/mach-omap1/include/mach/lcd_dma.h
new file mode 100644
index 000000000000..d7a457bbcb7f
--- /dev/null
+++ b/arch/arm/mach-omap1/include/mach/lcd_dma.h
@@ -0,0 +1,78 @@
+/*
+ *  arch/arm/mach-omap1/include/mach/lcd_dma.h
+ *
+ * Extracted from arch/arm/plat-omap/include/plat/dma.h
+ *  Copyright (C) 2003 Nokia Corporation
+ *  Author: Juha Yrjölä <juha.yrjola@nokia.com>
+ *
+ * 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.
+ *
+ * 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.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+#ifndef __MACH_OMAP1_LCD_DMA_H__
+#define __MACH_OMAP1_LCD_DMA_H__
+
+/* Hardware registers for LCD DMA */
+#define OMAP1510_DMA_LCD_BASE           (0xfffedb00)
+#define OMAP1510_DMA_LCD_CTRL           (OMAP1510_DMA_LCD_BASE + 0x00)
+#define OMAP1510_DMA_LCD_TOP_F1_L       (OMAP1510_DMA_LCD_BASE + 0x02)
+#define OMAP1510_DMA_LCD_TOP_F1_U       (OMAP1510_DMA_LCD_BASE + 0x04)
+#define OMAP1510_DMA_LCD_BOT_F1_L       (OMAP1510_DMA_LCD_BASE + 0x06)
+#define OMAP1510_DMA_LCD_BOT_F1_U       (OMAP1510_DMA_LCD_BASE + 0x08)
+
+#define OMAP1610_DMA_LCD_BASE           (0xfffee300)
+#define OMAP1610_DMA_LCD_CSDP           (OMAP1610_DMA_LCD_BASE + 0xc0)
+#define OMAP1610_DMA_LCD_CCR            (OMAP1610_DMA_LCD_BASE + 0xc2)
+#define OMAP1610_DMA_LCD_CTRL           (OMAP1610_DMA_LCD_BASE + 0xc4)
+#define OMAP1610_DMA_LCD_TOP_B1_L       (OMAP1610_DMA_LCD_BASE + 0xc8)
+#define OMAP1610_DMA_LCD_TOP_B1_U       (OMAP1610_DMA_LCD_BASE + 0xca)
+#define OMAP1610_DMA_LCD_BOT_B1_L       (OMAP1610_DMA_LCD_BASE + 0xcc)
+#define OMAP1610_DMA_LCD_BOT_B1_U       (OMAP1610_DMA_LCD_BASE + 0xce)
+#define OMAP1610_DMA_LCD_TOP_B2_L       (OMAP1610_DMA_LCD_BASE + 0xd0)
+#define OMAP1610_DMA_LCD_TOP_B2_U       (OMAP1610_DMA_LCD_BASE + 0xd2)
+#define OMAP1610_DMA_LCD_BOT_B2_L       (OMAP1610_DMA_LCD_BASE + 0xd4)
+#define OMAP1610_DMA_LCD_BOT_B2_U       (OMAP1610_DMA_LCD_BASE + 0xd6)
+#define OMAP1610_DMA_LCD_SRC_EI_B1      (OMAP1610_DMA_LCD_BASE + 0xd8)
+#define OMAP1610_DMA_LCD_SRC_FI_B1_L    (OMAP1610_DMA_LCD_BASE + 0xda)
+#define OMAP1610_DMA_LCD_SRC_EN_B1      (OMAP1610_DMA_LCD_BASE + 0xe0)
+#define OMAP1610_DMA_LCD_SRC_FN_B1      (OMAP1610_DMA_LCD_BASE + 0xe4)
+#define OMAP1610_DMA_LCD_LCH_CTRL       (OMAP1610_DMA_LCD_BASE + 0xea)
+#define OMAP1610_DMA_LCD_SRC_FI_B1_U    (OMAP1610_DMA_LCD_BASE + 0xf4)
+
+/* LCD DMA block numbers */
+enum {
+        OMAP_LCD_DMA_B1_TOP,
+        OMAP_LCD_DMA_B1_BOTTOM,
+        OMAP_LCD_DMA_B2_TOP,
+        OMAP_LCD_DMA_B2_BOTTOM
+};
+
+/* LCD DMA functions */
+extern int omap_request_lcd_dma(void (*callback)(u16 status, void *data),
+                                void *data);
+extern void omap_free_lcd_dma(void);
+extern void omap_setup_lcd_dma(void);
+extern void omap_enable_lcd_dma(void);
+extern void omap_stop_lcd_dma(void);
+extern void omap_set_lcd_dma_ext_controller(int external);
+extern void omap_set_lcd_dma_single_transfer(int single);
+extern void omap_set_lcd_dma_b1(unsigned long addr, u16 fb_xres, u16 fb_yres,
+                                int data_type);
+extern void omap_set_lcd_dma_b1_rotation(int rotate);
+extern void omap_set_lcd_dma_b1_vxres(unsigned long vxres);
+extern void omap_set_lcd_dma_b1_mirror(int mirror);
+extern void omap_set_lcd_dma_b1_scale(unsigned int xscale, unsigned int yscale);
+
+extern int omap_lcd_dma_running(void);
+
+#endif /* __MACH_OMAP1_LCD_DMA_H__ */
diff --git a/arch/arm/mach-omap1/lcd_dma.c b/arch/arm/mach-omap1/lcd_dma.c
new file mode 100644
index 000000000000..48895140695f
--- /dev/null
+++ b/arch/arm/mach-omap1/lcd_dma.c
@@ -0,0 +1,447 @@
+/*
+ * linux/arch/arm/mach-omap1/lcd_dma.c
+ *
+ * Extracted from arch/arm/plat-omap/dma.c
+ * Copyright (C) 2003 - 2008 Nokia Corporation
+ * Author: Juha Yrjölä <juha.yrjola@nokia.com>
+ * DMA channel linking for 1610 by Samuel Ortiz <samuel.ortiz@nokia.com>
+ * Graphics DMA and LCD DMA graphics tranformations
+ * by Imre Deak <imre.deak@nokia.com>
+ * OMAP2/3 support Copyright (C) 2004-2007 Texas Instruments, Inc.
+ * Merged to support both OMAP1 and OMAP2 by Tony Lindgren <tony@atomide.com>
+ * Some functions based on earlier dma-omap.c Copyright (C) 2001 RidgeRun, Inc.
+ *
+ * Copyright (C) 2009 Texas Instruments
+ * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
+ *
+ * Support functions for the OMAP internal DMA channels.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+
+#include <mach/hardware.h>
+#include <plat/dma.h>
+
+int omap_lcd_dma_running(void)
+{
+        /*
+         * On OMAP1510, internal LCD controller will start the transfer
+         * when it gets enabled, so assume DMA running if LCD enabled.
+         */
+        if (cpu_is_omap1510())
+                if (omap_readw(0xfffec000 + 0x00) & (1 << 0))
+                        return 1;
+
+        /* Check if LCD DMA is running */
+        if (cpu_is_omap16xx())
+                if (omap_readw(OMAP1610_DMA_LCD_CCR) & OMAP_DMA_CCR_EN)
+                        return 1;
+
+        return 0;
+}
+
+static struct lcd_dma_info {
+        spinlock_t lock;
+        int reserved;
+        void (*callback)(u16 status, void *data);
+        void *cb_data;
+
+        int active;
+        unsigned long addr, size;
+        int rotate, data_type, xres, yres;
+        int vxres;
+        int mirror;
+        int xscale, yscale;
+        int ext_ctrl;
+        int src_port;
+        int single_transfer;
+} lcd_dma;
+
+void omap_set_lcd_dma_b1(unsigned long addr, u16 fb_xres, u16 fb_yres,
+                         int data_type)
+{
+        lcd_dma.addr = addr;
+        lcd_dma.data_type = data_type;
+        lcd_dma.xres = fb_xres;
+        lcd_dma.yres = fb_yres;
+}
+EXPORT_SYMBOL(omap_set_lcd_dma_b1);
+
+void omap_set_lcd_dma_src_port(int port)
+{
+        lcd_dma.src_port = port;
+}
+
+void omap_set_lcd_dma_ext_controller(int external)
+{
+        lcd_dma.ext_ctrl = external;
+}
+EXPORT_SYMBOL(omap_set_lcd_dma_ext_controller);
+
+void omap_set_lcd_dma_single_transfer(int single)
+{
+        lcd_dma.single_transfer = single;
+}
+EXPORT_SYMBOL(omap_set_lcd_dma_single_transfer);
+
+void omap_set_lcd_dma_b1_rotation(int rotate)
+{
+        if (cpu_is_omap1510()) {
+                printk(KERN_ERR "DMA rotation is not supported in 1510 mode\n");
+                BUG();
+                return;
+        }
+        lcd_dma.rotate = rotate;
+}
+EXPORT_SYMBOL(omap_set_lcd_dma_b1_rotation);
+
+void omap_set_lcd_dma_b1_mirror(int mirror)
+{
+        if (cpu_is_omap1510()) {
+                printk(KERN_ERR "DMA mirror is not supported in 1510 mode\n");
+                BUG();
+        }
+        lcd_dma.mirror = mirror;
+}
+EXPORT_SYMBOL(omap_set_lcd_dma_b1_mirror);
+
+void omap_set_lcd_dma_b1_vxres(unsigned long vxres)
+{
+        if (cpu_is_omap1510()) {
+                printk(KERN_ERR "DMA virtual resulotion is not supported "
+                                "in 1510 mode\n");
+                BUG();
+        }
+        lcd_dma.vxres = vxres;
+}
+EXPORT_SYMBOL(omap_set_lcd_dma_b1_vxres);
+
+void omap_set_lcd_dma_b1_scale(unsigned int xscale, unsigned int yscale)
+{
+        if (cpu_is_omap1510()) {
+                printk(KERN_ERR "DMA scale is not supported in 1510 mode\n");
+                BUG();
+        }
+        lcd_dma.xscale = xscale;
+        lcd_dma.yscale = yscale;
+}
+EXPORT_SYMBOL(omap_set_lcd_dma_b1_scale);
+
+static void set_b1_regs(void)
+{
+        unsigned long top, bottom;
+        int es;
+        u16 w;
+        unsigned long en, fn;
+        long ei, fi;
+        unsigned long vxres;
+        unsigned int xscale, yscale;
+
+        switch (lcd_dma.data_type) {
+        case OMAP_DMA_DATA_TYPE_S8:
+                es = 1;
+                break;
+        case OMAP_DMA_DATA_TYPE_S16:
+                es = 2;
+                break;
+        case OMAP_DMA_DATA_TYPE_S32:
+                es = 4;
+                break;
+        default:
+                BUG();
+                return;
+        }
+
+        vxres = lcd_dma.vxres ? lcd_dma.vxres : lcd_dma.xres;
+        xscale = lcd_dma.xscale ? lcd_dma.xscale : 1;
+        yscale = lcd_dma.yscale ? lcd_dma.yscale : 1;
+        BUG_ON(vxres < lcd_dma.xres);
+
+#define PIXADDR(x, y) (lcd_dma.addr +                                   \
+                ((y) * vxres * yscale + (x) * xscale) * es)
+#define PIXSTEP(sx, sy, dx, dy) (PIXADDR(dx, dy) - PIXADDR(sx, sy) - es + 1)
+
+        switch (lcd_dma.rotate) {
+        case 0:
+                if (!lcd_dma.mirror) {
+                        top = PIXADDR(0, 0);
+                        bottom = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
+                        /* 1510 DMA requires the bottom address to be 2 more
+                         * than the actual last memory access location. */
+                        if (cpu_is_omap1510() &&
+                                lcd_dma.data_type == OMAP_DMA_DATA_TYPE_S32)
+                                        bottom += 2;
+                        ei = PIXSTEP(0, 0, 1, 0);
+                        fi = PIXSTEP(lcd_dma.xres - 1, 0, 0, 1);
+                } else {
+                        top = PIXADDR(lcd_dma.xres - 1, 0);
+                        bottom = PIXADDR(0, lcd_dma.yres - 1);
+                        ei = PIXSTEP(1, 0, 0, 0);
+                        fi = PIXSTEP(0, 0, lcd_dma.xres - 1, 1);
+                }
+                en = lcd_dma.xres;
+                fn = lcd_dma.yres;
+                break;
+        case 90:
+                if (!lcd_dma.mirror) {
+                        top = PIXADDR(0, lcd_dma.yres - 1);
+                        bottom = PIXADDR(lcd_dma.xres - 1, 0);
+                        ei = PIXSTEP(0, 1, 0, 0);
+                        fi = PIXSTEP(0, 0, 1, lcd_dma.yres - 1);
+                } else {
+                        top = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
+                        bottom = PIXADDR(0, 0);
+                        ei = PIXSTEP(0, 1, 0, 0);
+                        fi = PIXSTEP(1, 0, 0, lcd_dma.yres - 1);
+                }
+                en = lcd_dma.yres;
+                fn = lcd_dma.xres;
+                break;
+        case 180:
+                if (!lcd_dma.mirror) {
+                        top = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
+                        bottom = PIXADDR(0, 0);
+                        ei = PIXSTEP(1, 0, 0, 0);
+                        fi = PIXSTEP(0, 1, lcd_dma.xres - 1, 0);
+                } else {
+                        top = PIXADDR(0, lcd_dma.yres - 1);
+                        bottom = PIXADDR(lcd_dma.xres - 1, 0);
+                        ei = PIXSTEP(0, 0, 1, 0);
+                        fi = PIXSTEP(lcd_dma.xres - 1, 1, 0, 0);
+                }
+                en = lcd_dma.xres;
+                fn = lcd_dma.yres;
+                break;
+        case 270:
+                if (!lcd_dma.mirror) {
+                        top = PIXADDR(lcd_dma.xres - 1, 0);
+                        bottom = PIXADDR(0, lcd_dma.yres - 1);
+                        ei = PIXSTEP(0, 0, 0, 1);
+                        fi = PIXSTEP(1, lcd_dma.yres - 1, 0, 0);
+                } else {
+                        top = PIXADDR(0, 0);
+                        bottom = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
+                        ei = PIXSTEP(0, 0, 0, 1);
+                        fi = PIXSTEP(0, lcd_dma.yres - 1, 1, 0);
+                }
+                en = lcd_dma.yres;
+                fn = lcd_dma.xres;
+                break;
+        default:
+                BUG();
+                return; /* Suppress warning about uninitialized vars */
+        }
+
+        if (cpu_is_omap1510()) {
+                omap_writew(top >> 16, OMAP1510_DMA_LCD_TOP_F1_U);
+                omap_writew(top, OMAP1510_DMA_LCD_TOP_F1_L);
+                omap_writew(bottom >> 16, OMAP1510_DMA_LCD_BOT_F1_U);
+                omap_writew(bottom, OMAP1510_DMA_LCD_BOT_F1_L);
+
+                return;
+        }
+
+        /* 1610 regs */
+        omap_writew(top >> 16, OMAP1610_DMA_LCD_TOP_B1_U);
+        omap_writew(top, OMAP1610_DMA_LCD_TOP_B1_L);
+        omap_writew(bottom >> 16, OMAP1610_DMA_LCD_BOT_B1_U);
+        omap_writew(bottom, OMAP1610_DMA_LCD_BOT_B1_L);
+
+        omap_writew(en, OMAP1610_DMA_LCD_SRC_EN_B1);
+        omap_writew(fn, OMAP1610_DMA_LCD_SRC_FN_B1);
+
+        w = omap_readw(OMAP1610_DMA_LCD_CSDP);
+        w &= ~0x03;
+        w |= lcd_dma.data_type;
+        omap_writew(w, OMAP1610_DMA_LCD_CSDP);
+
+        w = omap_readw(OMAP1610_DMA_LCD_CTRL);
+        /* Always set the source port as SDRAM for now*/
+        w &= ~(0x03 << 6);
+        if (lcd_dma.callback != NULL)
+                w |= 1 << 1;            /* Block interrupt enable */
+        else
+                w &= ~(1 << 1);
+        omap_writew(w, OMAP1610_DMA_LCD_CTRL);
+
+        if (!(lcd_dma.rotate || lcd_dma.mirror ||
+              lcd_dma.vxres || lcd_dma.xscale || lcd_dma.yscale))
+                return;
+
+        w = omap_readw(OMAP1610_DMA_LCD_CCR);
+        /* Set the double-indexed addressing mode */
+        w |= (0x03 << 12);
+        omap_writew(w, OMAP1610_DMA_LCD_CCR);
+
+        omap_writew(ei, OMAP1610_DMA_LCD_SRC_EI_B1);
+        omap_writew(fi >> 16, OMAP1610_DMA_LCD_SRC_FI_B1_U);
+        omap_writew(fi, OMAP1610_DMA_LCD_SRC_FI_B1_L);
+}
+
+static irqreturn_t lcd_dma_irq_handler(int irq, void *dev_id)
+{
+        u16 w;
+
+        w = omap_readw(OMAP1610_DMA_LCD_CTRL);
+        if (unlikely(!(w & (1 << 3)))) {
+                printk(KERN_WARNING "Spurious LCD DMA IRQ\n");
+                return IRQ_NONE;
+        }
+        /* Ack the IRQ */
+        w |= (1 << 3);
+        omap_writew(w, OMAP1610_DMA_LCD_CTRL);
+        lcd_dma.active = 0;
+        if (lcd_dma.callback != NULL)
+                lcd_dma.callback(w, lcd_dma.cb_data);
+
+        return IRQ_HANDLED;
+}
+
+int omap_request_lcd_dma(void (*callback)(u16 status, void *data),
+                         void *data)
+{
+        spin_lock_irq(&lcd_dma.lock);
+        if (lcd_dma.reserved) {
+                spin_unlock_irq(&lcd_dma.lock);
+                printk(KERN_ERR "LCD DMA channel already reserved\n");
+                BUG();
+                return -EBUSY;
+        }
+        lcd_dma.reserved = 1;
+        spin_unlock_irq(&lcd_dma.lock);
+        lcd_dma.callback = callback;
+        lcd_dma.cb_data = data;
+        lcd_dma.active = 0;
+        lcd_dma.single_transfer = 0;
+        lcd_dma.rotate = 0;
+        lcd_dma.vxres = 0;
+        lcd_dma.mirror = 0;
+        lcd_dma.xscale = 0;
+        lcd_dma.yscale = 0;
+        lcd_dma.ext_ctrl = 0;
+        lcd_dma.src_port = 0;
+
+        return 0;
+}
+EXPORT_SYMBOL(omap_request_lcd_dma);
+
+void omap_free_lcd_dma(void)
+{
+        spin_lock(&lcd_dma.lock);
+        if (!lcd_dma.reserved) {
+                spin_unlock(&lcd_dma.lock);
+                printk(KERN_ERR "LCD DMA is not reserved\n");
+                BUG();
+                return;
+        }
+        if (!cpu_is_omap1510())
+                omap_writew(omap_readw(OMAP1610_DMA_LCD_CCR) & ~1,
+                            OMAP1610_DMA_LCD_CCR);
+        lcd_dma.reserved = 0;
+        spin_unlock(&lcd_dma.lock);
+}
+EXPORT_SYMBOL(omap_free_lcd_dma);
+
+void omap_enable_lcd_dma(void)
+{
+        u16 w;
+
+        /*
+         * Set the Enable bit only if an external controller is
+         * connected. Otherwise the OMAP internal controller will
+         * start the transfer when it gets enabled.
+         */
+        if (cpu_is_omap1510() || !lcd_dma.ext_ctrl)
+                return;
+
+        w = omap_readw(OMAP1610_DMA_LCD_CTRL);
+        w |= 1 << 8;
+        omap_writew(w, OMAP1610_DMA_LCD_CTRL);
+
+        lcd_dma.active = 1;
+
+        w = omap_readw(OMAP1610_DMA_LCD_CCR);
+        w |= 1 << 7;
+        omap_writew(w, OMAP1610_DMA_LCD_CCR);
+}
+EXPORT_SYMBOL(omap_enable_lcd_dma);
+
+void omap_setup_lcd_dma(void)
+{
+        BUG_ON(lcd_dma.active);
+        if (!cpu_is_omap1510()) {
+                /* Set some reasonable defaults */
+                omap_writew(0x5440, OMAP1610_DMA_LCD_CCR);
+                omap_writew(0x9102, OMAP1610_DMA_LCD_CSDP);
+                omap_writew(0x0004, OMAP1610_DMA_LCD_LCH_CTRL);
+        }
+        set_b1_regs();
+        if (!cpu_is_omap1510()) {
+                u16 w;
+
+                w = omap_readw(OMAP1610_DMA_LCD_CCR);
+                /*
+                 * If DMA was already active set the end_prog bit to have
+                 * the programmed register set loaded into the active
+                 * register set.
+                 */
+                w |= 1 << 11;           /* End_prog */
+                if (!lcd_dma.single_transfer)
+                        w |= (3 << 8);  /* Auto_init, repeat */
+                omap_writew(w, OMAP1610_DMA_LCD_CCR);
+        }
+}
+EXPORT_SYMBOL(omap_setup_lcd_dma);
+
+void omap_stop_lcd_dma(void)
+{
+        u16 w;
+
+        lcd_dma.active = 0;
+        if (cpu_is_omap1510() || !lcd_dma.ext_ctrl)
+                return;
+
+        w = omap_readw(OMAP1610_DMA_LCD_CCR);
+        w &= ~(1 << 7);
+        omap_writew(w, OMAP1610_DMA_LCD_CCR);
+
+        w = omap_readw(OMAP1610_DMA_LCD_CTRL);
+        w &= ~(1 << 8);
+        omap_writew(w, OMAP1610_DMA_LCD_CTRL);
+}
+EXPORT_SYMBOL(omap_stop_lcd_dma);
+
+static int __init omap_init_lcd_dma(void)
+{
+        int r;
+
+        if (cpu_is_omap16xx()) {
+                u16 w;
+
+                /* this would prevent OMAP sleep */
+                w = omap_readw(OMAP1610_DMA_LCD_CTRL);
+                w &= ~(1 << 8);
+                omap_writew(w, OMAP1610_DMA_LCD_CTRL);
+        }
+
+        spin_lock_init(&lcd_dma.lock);
+
+        r = request_irq(INT_DMA_LCD, lcd_dma_irq_handler, 0,
+                        "LCD DMA", NULL);
+        if (r != 0)
+                printk(KERN_ERR "unable to request IRQ for LCD DMA "
+                               "(error %d)\n", r);
+
+        return r;
+}
+
+arch_initcall(omap_init_lcd_dma);
+