fs: use kmem_cache_zalloc instead

[pv_ops_mirror.git] / drivers / video / omap / lcdc.c

/*
 * OMAP1 internal LCD controller
 *
 * Copyright (C) 2004 Nokia Corporation
 * Author: Imre Deak <imre.deak@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.
 */
#include <linux/module.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/err.h>
#include <linux/mm.h>
#include <linux/fb.h>
#include <linux/dma-mapping.h>
#include <linux/vmalloc.h>
#include <linux/clk.h>

#include <asm/arch/dma.h>
#include <asm/arch/omapfb.h>

#include <asm/mach-types.h>

#define MODULE_NAME                     "lcdc"

#define OMAP_LCDC_BASE                  0xfffec000
#define OMAP_LCDC_SIZE                  256
#define OMAP_LCDC_IRQ                   INT_LCD_CTRL

#define OMAP_LCDC_CONTROL               (OMAP_LCDC_BASE + 0x00)
#define OMAP_LCDC_TIMING0               (OMAP_LCDC_BASE + 0x04)
#define OMAP_LCDC_TIMING1               (OMAP_LCDC_BASE + 0x08)
#define OMAP_LCDC_TIMING2               (OMAP_LCDC_BASE + 0x0c)
#define OMAP_LCDC_STATUS                (OMAP_LCDC_BASE + 0x10)
#define OMAP_LCDC_SUBPANEL              (OMAP_LCDC_BASE + 0x14)
#define OMAP_LCDC_LINE_INT              (OMAP_LCDC_BASE + 0x18)
#define OMAP_LCDC_DISPLAY_STATUS        (OMAP_LCDC_BASE + 0x1c)

#define OMAP_LCDC_STAT_DONE             (1 << 0)
#define OMAP_LCDC_STAT_VSYNC            (1 << 1)
#define OMAP_LCDC_STAT_SYNC_LOST        (1 << 2)
#define OMAP_LCDC_STAT_ABC              (1 << 3)
#define OMAP_LCDC_STAT_LINE_INT         (1 << 4)
#define OMAP_LCDC_STAT_FUF              (1 << 5)
#define OMAP_LCDC_STAT_LOADED_PALETTE   (1 << 6)

#define OMAP_LCDC_CTRL_LCD_EN           (1 << 0)
#define OMAP_LCDC_CTRL_LCD_TFT          (1 << 7)
#define OMAP_LCDC_CTRL_LINE_IRQ_CLR_SEL (1 << 10)

#define OMAP_LCDC_IRQ_VSYNC             (1 << 2)
#define OMAP_LCDC_IRQ_DONE              (1 << 3)
#define OMAP_LCDC_IRQ_LOADED_PALETTE    (1 << 4)
#define OMAP_LCDC_IRQ_LINE_NIRQ         (1 << 5)
#define OMAP_LCDC_IRQ_LINE              (1 << 6)
#define OMAP_LCDC_IRQ_MASK              (((1 << 5) - 1) << 2)

#define MAX_PALETTE_SIZE                PAGE_SIZE

enum lcdc_load_mode {
        OMAP_LCDC_LOAD_PALETTE,
        OMAP_LCDC_LOAD_FRAME,
        OMAP_LCDC_LOAD_PALETTE_AND_FRAME
};

static struct omap_lcd_controller {
        enum omapfb_update_mode update_mode;
        int                     ext_mode;

        unsigned long           frame_offset;
        int                     screen_width;
        int                     xres;
        int                     yres;

        enum omapfb_color_format        color_mode;
        int                     bpp;
        void                    *palette_virt;
        dma_addr_t              palette_phys;
        int                     palette_code;
        int                     palette_size;

        unsigned int            irq_mask;
        struct completion       last_frame_complete;
        struct completion       palette_load_complete;
        struct clk              *lcd_ck;
        struct omapfb_device    *fbdev;

        void                    (*dma_callback)(void *data);
        void                    *dma_callback_data;

        int                     fbmem_allocated;
        dma_addr_t              vram_phys;
        void                    *vram_virt;
        unsigned long           vram_size;
} lcdc;

static void inline enable_irqs(int mask)
{
        lcdc.irq_mask |= mask;
}

static void inline disable_irqs(int mask)
{
        lcdc.irq_mask &= ~mask;
}

static void set_load_mode(enum lcdc_load_mode mode)
{
        u32 l;

        l = omap_readl(OMAP_LCDC_CONTROL);
        l &= ~(3 << 20);
        switch (mode) {
        case OMAP_LCDC_LOAD_PALETTE:
                l |= 1 << 20;
                break;
        case OMAP_LCDC_LOAD_FRAME:
                l |= 2 << 20;
                break;
        case OMAP_LCDC_LOAD_PALETTE_AND_FRAME:
                break;
        default:
                BUG();
        }
        omap_writel(l, OMAP_LCDC_CONTROL);
}

static void enable_controller(void)
{
        u32 l;

        l = omap_readl(OMAP_LCDC_CONTROL);
        l |= OMAP_LCDC_CTRL_LCD_EN;
        l &= ~OMAP_LCDC_IRQ_MASK;
        l |= lcdc.irq_mask | OMAP_LCDC_IRQ_DONE;        /* enabled IRQs */
        omap_writel(l, OMAP_LCDC_CONTROL);
}

static void disable_controller_async(void)
{
        u32 l;
        u32 mask;

        l = omap_readl(OMAP_LCDC_CONTROL);
        mask = OMAP_LCDC_CTRL_LCD_EN | OMAP_LCDC_IRQ_MASK;
        /*
         * Preserve the DONE mask, since we still want to get the
         * final DONE irq. It will be disabled in the IRQ handler.
         */
        mask &= ~OMAP_LCDC_IRQ_DONE;
        l &= ~mask;
        omap_writel(l, OMAP_LCDC_CONTROL);
}

static void disable_controller(void)
{
        init_completion(&lcdc.last_frame_complete);
        disable_controller_async();
        if (!wait_for_completion_timeout(&lcdc.last_frame_complete,
                                msecs_to_jiffies(500)))
                dev_err(lcdc.fbdev->dev, "timeout waiting for FRAME DONE\n");
}

static void reset_controller(u32 status)
{
        static unsigned long reset_count;
        static unsigned long last_jiffies;

        disable_controller_async();
        reset_count++;
        if (reset_count == 1 || time_after(jiffies, last_jiffies + HZ)) {
                dev_err(lcdc.fbdev->dev,
                          "resetting (status %#010x,reset count %lu)\n",
                          status, reset_count);
                last_jiffies = jiffies;
        }
        if (reset_count < 100) {
                enable_controller();
        } else {
                reset_count = 0;
                dev_err(lcdc.fbdev->dev,
                        "too many reset attempts, giving up.\n");
        }
}

/*
 * Configure the LCD DMA according to the current mode specified by parameters
 * in lcdc.fbdev and fbdev->var.
 */
static void setup_lcd_dma(void)
{
        static const int dma_elem_type[] = {
                0,
                OMAP_DMA_DATA_TYPE_S8,
                OMAP_DMA_DATA_TYPE_S16,
                0,
                OMAP_DMA_DATA_TYPE_S32,
        };
        struct omapfb_plane_struct *plane = lcdc.fbdev->fb_info[0]->par;
        struct fb_var_screeninfo *var = &lcdc.fbdev->fb_info[0]->var;
        unsigned long   src;
        int             esize, xelem, yelem;

        src = lcdc.vram_phys + lcdc.frame_offset;

        switch (var->rotate) {
        case 0:
                if (plane->info.mirror || (src & 3) ||
                    lcdc.color_mode == OMAPFB_COLOR_YUV420 ||
                    (lcdc.xres & 1))
                        esize = 2;
                else
                        esize = 4;
                xelem = lcdc.xres * lcdc.bpp / 8 / esize;
                yelem = lcdc.yres;
                break;
        case 90:
        case 180:
        case 270:
                if (cpu_is_omap15xx()) {
                        BUG();
                }
                esize = 2;
                xelem = lcdc.yres * lcdc.bpp / 16;
                yelem = lcdc.xres;
                break;
        default:
                BUG();
                return;
        }
#ifdef VERBOSE
        dev_dbg(lcdc.fbdev->dev,
                 "setup_dma: src %#010lx esize %d xelem %d yelem %d\n",
                 src, esize, xelem, yelem);
#endif
        omap_set_lcd_dma_b1(src, xelem, yelem, dma_elem_type[esize]);
        if (!cpu_is_omap15xx()) {
                int bpp = lcdc.bpp;

                /*
                 * YUV support is only for external mode when we have the
                 * YUV window embedded in a 16bpp frame buffer.
                 */
                if (lcdc.color_mode == OMAPFB_COLOR_YUV420)
                        bpp = 16;
                /* Set virtual xres elem size */
                omap_set_lcd_dma_b1_vxres(
                        lcdc.screen_width * bpp / 8 / esize);
                /* Setup transformations */
                omap_set_lcd_dma_b1_rotation(var->rotate);
                omap_set_lcd_dma_b1_mirror(plane->info.mirror);
        }
        omap_setup_lcd_dma();
}

static irqreturn_t lcdc_irq_handler(int irq, void *dev_id)
{
        u32 status;

        status = omap_readl(OMAP_LCDC_STATUS);

        if (status & (OMAP_LCDC_STAT_FUF | OMAP_LCDC_STAT_SYNC_LOST))
                reset_controller(status);
        else {
                if (status & OMAP_LCDC_STAT_DONE) {
                        u32 l;

                        /*
                         * Disable IRQ_DONE. The status bit will be cleared
                         * only when the controller is reenabled and we don't
                         * want to get more interrupts.
                         */
                        l = omap_readl(OMAP_LCDC_CONTROL);
                        l &= ~OMAP_LCDC_IRQ_DONE;
                        omap_writel(l, OMAP_LCDC_CONTROL);
                        complete(&lcdc.last_frame_complete);
                }
                if (status & OMAP_LCDC_STAT_LOADED_PALETTE) {
                        disable_controller_async();
                        complete(&lcdc.palette_load_complete);
                }
        }

        /*
         * Clear these interrupt status bits.
         * Sync_lost, FUF bits were cleared by disabling the LCD controller
         * LOADED_PALETTE can be cleared this way only in palette only
         * load mode. In other load modes it's cleared by disabling the
         * controller.
         */
        status &= ~(OMAP_LCDC_STAT_VSYNC |
                    OMAP_LCDC_STAT_LOADED_PALETTE |
                    OMAP_LCDC_STAT_ABC |
                    OMAP_LCDC_STAT_LINE_INT);
        omap_writel(status, OMAP_LCDC_STATUS);
        return IRQ_HANDLED;
}

/*
 * Change to a new video mode. We defer this to a later time to avoid any
 * flicker and not to mess up the current LCD DMA context. For this we disable
 * the LCD controler, which will generate a DONE irq after the last frame has
 * been transferred. Then it'll be safe to reconfigure both the LCD controller
 * as well as the LCD DMA.
 */
static int omap_lcdc_setup_plane(int plane, int channel_out,
                                 unsigned long offset, int screen_width,
                                 int pos_x, int pos_y, int width, int height,
                                 int color_mode)
{
        struct fb_var_screeninfo *var = &lcdc.fbdev->fb_info[0]->var;
        struct lcd_panel *panel = lcdc.fbdev->panel;
        int rot_x, rot_y;

        if (var->rotate == 0) {
                rot_x = panel->x_res;
                rot_y = panel->y_res;
        } else {
                rot_x = panel->y_res;
                rot_y = panel->x_res;
        }
        if (plane != 0 || channel_out != 0 || pos_x != 0 || pos_y != 0 ||
            width > rot_x || height > rot_y) {
#ifdef VERBOSE
                dev_dbg(lcdc.fbdev->dev,
                        "invalid plane params plane %d pos_x %d pos_y %d "
                        "w %d h %d\n", plane, pos_x, pos_y, width, height);
#endif
                return -EINVAL;
        }

        lcdc.frame_offset = offset;
        lcdc.xres = width;
        lcdc.yres = height;
        lcdc.screen_width = screen_width;
        lcdc.color_mode = color_mode;

        switch (color_mode) {
        case OMAPFB_COLOR_CLUT_8BPP:
                lcdc.bpp = 8;
                lcdc.palette_code = 0x3000;
                lcdc.palette_size = 512;
                break;
        case OMAPFB_COLOR_RGB565:
                lcdc.bpp = 16;
                lcdc.palette_code = 0x4000;
                lcdc.palette_size = 32;
                break;
        case OMAPFB_COLOR_RGB444:
                lcdc.bpp = 16;
                lcdc.palette_code = 0x4000;
                lcdc.palette_size = 32;
                break;
        case OMAPFB_COLOR_YUV420:
                if (lcdc.ext_mode) {
                        lcdc.bpp = 12;
                        break;
                }
                /* fallthrough */
        case OMAPFB_COLOR_YUV422:
                if (lcdc.ext_mode) {
                        lcdc.bpp = 16;
                        break;
                }
                /* fallthrough */
        default:
                /* FIXME: other BPPs.
                 * bpp1: code  0,     size 256
                 * bpp2: code  0x1000 size 256
                 * bpp4: code  0x2000 size 256
                 * bpp12: code 0x4000 size 32
                 */
                dev_dbg(lcdc.fbdev->dev, "invalid color mode %d\n", color_mode);
                BUG();
                return -1;
        }

        if (lcdc.ext_mode) {
                setup_lcd_dma();
                return 0;
        }

        if (lcdc.update_mode == OMAPFB_AUTO_UPDATE) {
                disable_controller();
                omap_stop_lcd_dma();
                setup_lcd_dma();
                enable_controller();
        }

        return 0;
}

static int omap_lcdc_enable_plane(int plane, int enable)
{
        dev_dbg(lcdc.fbdev->dev,
                "plane %d enable %d update_mode %d ext_mode %d\n",
                plane, enable, lcdc.update_mode, lcdc.ext_mode);
        if (plane != OMAPFB_PLANE_GFX)
                return -EINVAL;

        return 0;
}

/*
 * Configure the LCD DMA for a palette load operation and do the palette
 * downloading synchronously. We don't use the frame+palette load mode of
 * the controller, since the palette can always be downloaded seperately.
 */
static void load_palette(void)
{
        u16     *palette;

        palette = (u16 *)lcdc.palette_virt;

        *(u16 *)palette &= 0x0fff;
        *(u16 *)palette |= lcdc.palette_code;

        omap_set_lcd_dma_b1(lcdc.palette_phys,
                lcdc.palette_size / 4 + 1, 1, OMAP_DMA_DATA_TYPE_S32);

        omap_set_lcd_dma_single_transfer(1);
        omap_setup_lcd_dma();

        init_completion(&lcdc.palette_load_complete);
        enable_irqs(OMAP_LCDC_IRQ_LOADED_PALETTE);
        set_load_mode(OMAP_LCDC_LOAD_PALETTE);
        enable_controller();
        if (!wait_for_completion_timeout(&lcdc.palette_load_complete,
                                msecs_to_jiffies(500)))
                dev_err(lcdc.fbdev->dev, "timeout waiting for FRAME DONE\n");
        /* The controller gets disabled in the irq handler */
        disable_irqs(OMAP_LCDC_IRQ_LOADED_PALETTE);
        omap_stop_lcd_dma();

        omap_set_lcd_dma_single_transfer(lcdc.ext_mode);
}

/* Used only in internal controller mode */
static int omap_lcdc_setcolreg(u_int regno, u16 red, u16 green, u16 blue,
                               u16 transp, int update_hw_pal)
{
        u16 *palette;

        if (lcdc.color_mode != OMAPFB_COLOR_CLUT_8BPP || regno > 255)
                return -EINVAL;

        palette = (u16 *)lcdc.palette_virt;

        palette[regno] &= ~0x0fff;
        palette[regno] |= ((red >> 12) << 8) | ((green >> 12) << 4 ) |
                           (blue >> 12);

        if (update_hw_pal) {
                disable_controller();
                omap_stop_lcd_dma();
                load_palette();
                setup_lcd_dma();
                set_load_mode(OMAP_LCDC_LOAD_FRAME);
                enable_controller();
        }

        return 0;
}

static void calc_ck_div(int is_tft, int pck, int *pck_div)
{
        unsigned long lck;

        pck = max(1, pck);
        lck = clk_get_rate(lcdc.lcd_ck);
        *pck_div = (lck + pck - 1) / pck;
        if (is_tft)
                *pck_div = max(2, *pck_div);
        else
                *pck_div = max(3, *pck_div);
        if (*pck_div > 255) {
                /* FIXME: try to adjust logic clock divider as well */
                *pck_div = 255;
                dev_warn(lcdc.fbdev->dev, "pixclock %d kHz too low.\n",
                         pck / 1000);
        }
}

static void inline setup_regs(void)
{
        u32 l;
        struct lcd_panel *panel = lcdc.fbdev->panel;
        int is_tft = panel->config & OMAP_LCDC_PANEL_TFT;
        unsigned long lck;
        int pcd;

        l = omap_readl(OMAP_LCDC_CONTROL);
        l &= ~OMAP_LCDC_CTRL_LCD_TFT;
        l |= is_tft ? OMAP_LCDC_CTRL_LCD_TFT : 0;
#ifdef CONFIG_MACH_OMAP_PALMTE
/* FIXME:if (machine_is_omap_palmte()) { */
                /* PalmTE uses alternate TFT setting in 8BPP mode */
                l |= (is_tft && panel->bpp == 8) ? 0x810000 : 0;
/*      } */
#endif
        omap_writel(l, OMAP_LCDC_CONTROL);

        l = omap_readl(OMAP_LCDC_TIMING2);
        l &= ~(((1 << 6) - 1) << 20);
        l |= (panel->config & OMAP_LCDC_SIGNAL_MASK) << 20;
        omap_writel(l, OMAP_LCDC_TIMING2);

        l = panel->x_res - 1;
        l |= (panel->hsw - 1) << 10;
        l |= (panel->hfp - 1) << 16;
        l |= (panel->hbp - 1) << 24;
        omap_writel(l, OMAP_LCDC_TIMING0);

        l = panel->y_res - 1;
        l |= (panel->vsw - 1) << 10;
        l |= panel->vfp << 16;
        l |= panel->vbp << 24;
        omap_writel(l, OMAP_LCDC_TIMING1);

        l = omap_readl(OMAP_LCDC_TIMING2);
        l &= ~0xff;

        lck = clk_get_rate(lcdc.lcd_ck);

        if (!panel->pcd)
                calc_ck_div(is_tft, panel->pixel_clock * 1000, &pcd);
        else {
                dev_warn(lcdc.fbdev->dev,
                    "Pixel clock divider value is obsolete.\n"
                    "Try to set pixel_clock to %lu and pcd to 0 "
                    "in drivers/video/omap/lcd_%s.c and submit a patch.\n",
                        lck / panel->pcd / 1000, panel->name);

                pcd = panel->pcd;
        }
        l |= pcd & 0xff;
        l |= panel->acb << 8;
        omap_writel(l, OMAP_LCDC_TIMING2);

        /* update panel info with the exact clock */
        panel->pixel_clock = lck / pcd / 1000;
}

/*
 * Configure the LCD controller, download the color palette and start a looped
 * DMA transfer of the frame image data. Called only in internal
 * controller mode.
 */
static int omap_lcdc_set_update_mode(enum omapfb_update_mode mode)
{
        int r = 0;

        if (mode != lcdc.update_mode) {
                switch (mode) {
                case OMAPFB_AUTO_UPDATE:
                        setup_regs();
                        load_palette();

                        /* Setup and start LCD DMA */
                        setup_lcd_dma();

                        set_load_mode(OMAP_LCDC_LOAD_FRAME);
                        enable_irqs(OMAP_LCDC_IRQ_DONE);
                        /* This will start the actual DMA transfer */
                        enable_controller();
                        lcdc.update_mode = mode;
                        break;
                case OMAPFB_UPDATE_DISABLED:
                        disable_controller();
                        omap_stop_lcd_dma();
                        lcdc.update_mode = mode;
                        break;
                default:
                        r = -EINVAL;
                }
        }

        return r;
}

static enum omapfb_update_mode omap_lcdc_get_update_mode(void)
{
        return lcdc.update_mode;
}

/* PM code called only in internal controller mode */
static void omap_lcdc_suspend(void)
{
        if (lcdc.update_mode == OMAPFB_AUTO_UPDATE) {
                disable_controller();
                omap_stop_lcd_dma();
        }
}

static void omap_lcdc_resume(void)
{
        if (lcdc.update_mode == OMAPFB_AUTO_UPDATE) {
                setup_regs();
                load_palette();
                setup_lcd_dma();
                set_load_mode(OMAP_LCDC_LOAD_FRAME);
                enable_irqs(OMAP_LCDC_IRQ_DONE);
                enable_controller();
        }
}

static void omap_lcdc_get_caps(int plane, struct omapfb_caps *caps)
{
        return;
}

int omap_lcdc_set_dma_callback(void (*callback)(void *data), void *data)
{
        BUG_ON(callback == NULL);

        if (lcdc.dma_callback)
                return -EBUSY;
        else {
                lcdc.dma_callback = callback;
                lcdc.dma_callback_data = data;
        }
        return 0;
}
EXPORT_SYMBOL(omap_lcdc_set_dma_callback);

void omap_lcdc_free_dma_callback(void)
{
        lcdc.dma_callback = NULL;
}
EXPORT_SYMBOL(omap_lcdc_free_dma_callback);

static void lcdc_dma_handler(u16 status, void *data)
{
        if (lcdc.dma_callback)
                lcdc.dma_callback(lcdc.dma_callback_data);
}

static int mmap_kern(void)
{
        struct vm_struct        *kvma;
        struct vm_area_struct   vma;
        pgprot_t                pgprot;
        unsigned long           vaddr;

        kvma = get_vm_area(lcdc.vram_size, VM_IOREMAP);
        if (kvma == NULL) {
                dev_err(lcdc.fbdev->dev, "can't get kernel vm area\n");
                return -ENOMEM;
        }
        vma.vm_mm = &init_mm;

        vaddr = (unsigned long)kvma->addr;
        vma.vm_start = vaddr;
        vma.vm_end = vaddr + lcdc.vram_size;

        pgprot = pgprot_writecombine(pgprot_kernel);
        if (io_remap_pfn_range(&vma, vaddr,
                           lcdc.vram_phys >> PAGE_SHIFT,
                           lcdc.vram_size, pgprot) < 0) {
                dev_err(lcdc.fbdev->dev, "kernel mmap for FB memory failed\n");
                return -EAGAIN;
        }

        lcdc.vram_virt = (void *)vaddr;

        return 0;
}

static void unmap_kern(void)
{
        vunmap(lcdc.vram_virt);
}

static int alloc_palette_ram(void)
{
        lcdc.palette_virt = dma_alloc_writecombine(lcdc.fbdev->dev,
                MAX_PALETTE_SIZE, &lcdc.palette_phys, GFP_KERNEL);
        if (lcdc.palette_virt == NULL) {
                dev_err(lcdc.fbdev->dev, "failed to alloc palette memory\n");
                return -ENOMEM;
        }
        memset(lcdc.palette_virt, 0, MAX_PALETTE_SIZE);

        return 0;
}

static void free_palette_ram(void)
{
        dma_free_writecombine(lcdc.fbdev->dev, MAX_PALETTE_SIZE,
                        lcdc.palette_virt, lcdc.palette_phys);
}

static int alloc_fbmem(struct omapfb_mem_region *region)
{
        int bpp;
        int frame_size;
        struct lcd_panel *panel = lcdc.fbdev->panel;

        bpp = panel->bpp;
        if (bpp == 12)
                bpp = 16;
        frame_size = PAGE_ALIGN(panel->x_res * bpp / 8 * panel->y_res);
        if (region->size > frame_size)
                frame_size = region->size;
        lcdc.vram_size = frame_size;
        lcdc.vram_virt = dma_alloc_writecombine(lcdc.fbdev->dev,
                        lcdc.vram_size, &lcdc.vram_phys, GFP_KERNEL);
        if (lcdc.vram_virt == NULL) {
                dev_err(lcdc.fbdev->dev, "unable to allocate FB DMA memory\n");
                return -ENOMEM;
        }
        region->size = frame_size;
        region->paddr = lcdc.vram_phys;
        region->vaddr = lcdc.vram_virt;
        region->alloc = 1;

        memset(lcdc.vram_virt, 0, lcdc.vram_size);

        return 0;
}

static void free_fbmem(void)
{
        dma_free_writecombine(lcdc.fbdev->dev, lcdc.vram_size,
                              lcdc.vram_virt, lcdc.vram_phys);
}

static int setup_fbmem(struct omapfb_mem_desc *req_md)
{
        int r;

        if (!req_md->region_cnt) {
                dev_err(lcdc.fbdev->dev, "no memory regions defined\n");
                return -EINVAL;
        }

        if (req_md->region_cnt > 1) {
                dev_err(lcdc.fbdev->dev, "only one plane is supported\n");
                req_md->region_cnt = 1;
        }

        if (req_md->region[0].paddr == 0) {
                lcdc.fbmem_allocated = 1;
                if ((r = alloc_fbmem(&req_md->region[0])) < 0)
                        return r;
                return 0;
        }

        lcdc.vram_phys = req_md->region[0].paddr;
        lcdc.vram_size = req_md->region[0].size;

        if ((r = mmap_kern()) < 0)
                return r;

        dev_dbg(lcdc.fbdev->dev, "vram at %08x size %08lx mapped to 0x%p\n",
                 lcdc.vram_phys, lcdc.vram_size, lcdc.vram_virt);

        return 0;
}

static void cleanup_fbmem(void)
{
        if (lcdc.fbmem_allocated)
                free_fbmem();
        else
                unmap_kern();
}

static int omap_lcdc_init(struct omapfb_device *fbdev, int ext_mode,
                          struct omapfb_mem_desc *req_vram)
{
        int r;
        u32 l;
        int rate;
        struct clk *tc_ck;

        lcdc.irq_mask = 0;

        lcdc.fbdev = fbdev;
        lcdc.ext_mode = ext_mode;

        l = 0;
        omap_writel(l, OMAP_LCDC_CONTROL);

        /* FIXME:
         * According to errata some platforms have a clock rate limitiation
         */
        lcdc.lcd_ck = clk_get(NULL, "lcd_ck");
        if (IS_ERR(lcdc.lcd_ck)) {
                dev_err(fbdev->dev, "unable to access LCD clock\n");
                r = PTR_ERR(lcdc.lcd_ck);
                goto fail0;
        }

        tc_ck = clk_get(NULL, "tc_ck");
        if (IS_ERR(tc_ck)) {
                dev_err(fbdev->dev, "unable to access TC clock\n");
                r = PTR_ERR(tc_ck);
                goto fail1;
        }

        rate = clk_get_rate(tc_ck);
        clk_put(tc_ck);

        if (machine_is_ams_delta())
                rate /= 4;
        if (machine_is_omap_h3())
                rate /= 3;
        r = clk_set_rate(lcdc.lcd_ck, rate);
        if (r) {
                dev_err(fbdev->dev, "failed to adjust LCD rate\n");
                goto fail1;
        }
        clk_enable(lcdc.lcd_ck);

        r = request_irq(OMAP_LCDC_IRQ, lcdc_irq_handler, 0, MODULE_NAME, fbdev);
        if (r) {
                dev_err(fbdev->dev, "unable to get IRQ\n");
                goto fail2;
        }

        r = omap_request_lcd_dma(lcdc_dma_handler, NULL);
        if (r) {
                dev_err(fbdev->dev, "unable to get LCD DMA\n");
                goto fail3;
        }

        omap_set_lcd_dma_single_transfer(ext_mode);
        omap_set_lcd_dma_ext_controller(ext_mode);

        if (!ext_mode)
                if ((r = alloc_palette_ram()) < 0)
                        goto fail4;

        if ((r = setup_fbmem(req_vram)) < 0)
                goto fail5;

        pr_info("omapfb: LCDC initialized\n");

        return 0;
fail5:
        if (!ext_mode)
                free_palette_ram();
fail4:
        omap_free_lcd_dma();
fail3:
        free_irq(OMAP_LCDC_IRQ, lcdc.fbdev);
fail2:
        clk_disable(lcdc.lcd_ck);
fail1:
        clk_put(lcdc.lcd_ck);
fail0:
        return r;
}

static void omap_lcdc_cleanup(void)
{
        if (!lcdc.ext_mode)
                free_palette_ram();
        cleanup_fbmem();
        omap_free_lcd_dma();
        free_irq(OMAP_LCDC_IRQ, lcdc.fbdev);
        clk_disable(lcdc.lcd_ck);
        clk_put(lcdc.lcd_ck);
}

const struct lcd_ctrl omap1_int_ctrl = {
        .name                   = "internal",
        .init                   = omap_lcdc_init,
        .cleanup                = omap_lcdc_cleanup,
        .get_caps               = omap_lcdc_get_caps,
        .set_update_mode        = omap_lcdc_set_update_mode,
        .get_update_mode        = omap_lcdc_get_update_mode,
        .update_window          = NULL,
        .suspend                = omap_lcdc_suspend,
        .resume                 = omap_lcdc_resume,
        .setup_plane            = omap_lcdc_setup_plane,
        .enable_plane           = omap_lcdc_enable_plane,
        .setcolreg              = omap_lcdc_setcolreg,
};