pxafb: introduce "struct pxafb_dma_buff" for palette and dma descriptors

Use structure and array for palette buffer and dma descriptors to:

1. better organize code for future expansion like overlays
2. separate palette and dma descriptors from frame buffer

Signed-off-by: eric miao <eric.miao@marvell.com>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 95 insertions, 83 deletions

diff --git a/drivers/video/pxafb.c b/drivers/video/pxafb.c
index d97dc9383d4..4e8f68b7c5b 100644
--- a/drivers/video/pxafb.c
+++ b/drivers/video/pxafb.c
@@ -361,7 +361,6 @@ static int pxafb_set_par(struct fb_info *info)
 {
         struct pxafb_info *fbi = (struct pxafb_info *)info;
         struct fb_var_screeninfo *var = &info->var;
-        unsigned long palette_mem_size;
 
         if (var->bits_per_pixel == 16)
                 fbi->fb.fix.visual = FB_VISUAL_TRUECOLOR;
@@ -384,13 +383,7 @@ static int pxafb_set_par(struct fb_info *info)
                 fbi->palette_size = var->bits_per_pixel == 1 ?
                                         4 : 1 << var->bits_per_pixel;
 
-        if ((fbi->lccr4 & LCCR4_PAL_FOR_MASK) == LCCR4_PAL_FOR_0)
-                palette_mem_size = fbi->palette_size * sizeof(u16);
-        else
-                palette_mem_size = fbi->palette_size * sizeof(u32);
-
-        fbi->palette_cpu = (u16 *)(fbi->map_cpu + PAGE_SIZE - palette_mem_size);
-        fbi->palette_dma = fbi->map_dma + PAGE_SIZE - palette_mem_size;
+        fbi->palette_cpu = (u16 *)&fbi->dma_buff->palette[0];
 
         /*
          * Set (any) board control register to handle new color depth
@@ -546,6 +539,48 @@ unsigned long pxafb_get_hsync_time(struct device *dev)
 }
 EXPORT_SYMBOL(pxafb_get_hsync_time);
 
+static int setup_frame_dma(struct pxafb_info *fbi, int dma, int pal,
+                unsigned int offset, size_t size)
+{
+        struct pxafb_dma_descriptor *dma_desc, *pal_desc;
+        unsigned int dma_desc_off, pal_desc_off;
+
+        if (dma < 0 || dma >= DMA_MAX)
+                return -EINVAL;
+
+        dma_desc = &fbi->dma_buff->dma_desc[dma];
+        dma_desc_off = offsetof(struct pxafb_dma_buff, dma_desc[dma]);
+
+        dma_desc->fsadr = fbi->screen_dma + offset;
+        dma_desc->fidr  = 0;
+        dma_desc->ldcmd = size;
+
+        if (pal < 0 || pal >= PAL_MAX) {
+                dma_desc->fdadr = fbi->dma_buff_phys + dma_desc_off;
+                fbi->fdadr[dma] = fbi->dma_buff_phys + dma_desc_off;
+        } else {
+                pal_desc = &fbi->dma_buff->pal_desc[dma];
+                pal_desc_off = offsetof(struct pxafb_dma_buff, dma_desc[pal]);
+
+                pal_desc->fsadr = fbi->dma_buff_phys + pal * PALETTE_SIZE;
+                pal_desc->fidr  = 0;
+
+                if ((fbi->lccr4 & LCCR4_PAL_FOR_MASK) == LCCR4_PAL_FOR_0)
+                        pal_desc->ldcmd = fbi->palette_size * sizeof(u16);
+                else
+                        pal_desc->ldcmd = fbi->palette_size * sizeof(u32);
+
+                pal_desc->ldcmd |= LDCMD_PAL;
+
+                /* flip back and forth between palette and frame buffer */
+                pal_desc->fdadr = fbi->dma_buff_phys + dma_desc_off;
+                dma_desc->fdadr = fbi->dma_buff_phys + pal_desc_off;
+                fbi->fdadr[dma] = fbi->dma_buff_phys + dma_desc_off;
+        }
+
+        return 0;
+}
+
 /*
  * pxafb_activate_var():
  *      Configures LCD Controller based on entries in var parameter.
@@ -557,6 +592,7 @@ static int pxafb_activate_var(struct fb_var_screeninfo *var,
         struct pxafb_lcd_reg new_regs;
         u_long flags;
         u_int lines_per_panel, pcd = get_pcd(fbi, var->pixclock);
+        size_t nbytes;
 
 #if DEBUG_VAR
         if (var->xres < 16 || var->xres > 1024)
@@ -634,54 +670,15 @@ static int pxafb_activate_var(struct fb_var_screeninfo *var,
         /* Update shadow copy atomically */
         local_irq_save(flags);
 
-        /* setup dma descriptors */
-        fbi->dmadesc_fblow_cpu = (struct pxafb_dma_descriptor *)
-                                ((unsigned int)fbi->palette_cpu - 3*16);
-        fbi->dmadesc_fbhigh_cpu = (struct pxafb_dma_descriptor *)
-                                ((unsigned int)fbi->palette_cpu - 2*16);
-        fbi->dmadesc_palette_cpu = (struct pxafb_dma_descriptor *)
-                                ((unsigned int)fbi->palette_cpu - 1*16);
-
-        fbi->dmadesc_fblow_dma = fbi->palette_dma - 3*16;
-        fbi->dmadesc_fbhigh_dma = fbi->palette_dma - 2*16;
-        fbi->dmadesc_palette_dma = fbi->palette_dma - 1*16;
-
-#define BYTES_PER_PANEL (lines_per_panel * fbi->fb.fix.line_length)
-
-        /* populate descriptors */
-        fbi->dmadesc_fblow_cpu->fdadr = fbi->dmadesc_fblow_dma;
-        fbi->dmadesc_fblow_cpu->fsadr = fbi->screen_dma + BYTES_PER_PANEL;
-        fbi->dmadesc_fblow_cpu->fidr  = 0;
-        fbi->dmadesc_fblow_cpu->ldcmd = BYTES_PER_PANEL;
-
-        fbi->fdadr1 = fbi->dmadesc_fblow_dma; /* only used in dual-panel mode */
-
-        fbi->dmadesc_fbhigh_cpu->fsadr = fbi->screen_dma;
-        fbi->dmadesc_fbhigh_cpu->fidr = 0;
-        fbi->dmadesc_fbhigh_cpu->ldcmd = BYTES_PER_PANEL;
-
-        fbi->dmadesc_palette_cpu->fsadr = fbi->palette_dma;
-        fbi->dmadesc_palette_cpu->fidr  = 0;
-        if ((fbi->lccr4 & LCCR4_PAL_FOR_MASK) == LCCR4_PAL_FOR_0)
-                fbi->dmadesc_palette_cpu->ldcmd = fbi->palette_size *
-                                                        sizeof(u16);
-        else
-                fbi->dmadesc_palette_cpu->ldcmd = fbi->palette_size *
-                                                        sizeof(u32);
-        fbi->dmadesc_palette_cpu->ldcmd |= LDCMD_PAL;
+        nbytes = lines_per_panel * fbi->fb.fix.line_length;
 
-        if (var->bits_per_pixel == 16) {
-                /* palette shouldn't be loaded in true-color mode */
-                fbi->dmadesc_fbhigh_cpu->fdadr = fbi->dmadesc_fbhigh_dma;
-                fbi->fdadr0 = fbi->dmadesc_fbhigh_dma; /* no pal just fbhigh */
-                /* init it to something, even though we won't be using it */
-                fbi->dmadesc_palette_cpu->fdadr = fbi->dmadesc_palette_dma;
-        } else {
-                /* flips back and forth between pal and fbhigh */
-                fbi->dmadesc_palette_cpu->fdadr = fbi->dmadesc_fbhigh_dma;
-                fbi->dmadesc_fbhigh_cpu->fdadr = fbi->dmadesc_palette_dma;
-                fbi->fdadr0 = fbi->dmadesc_palette_dma;
-        }
+        if ((fbi->lccr0 & LCCR0_SDS) == LCCR0_Dual)
+                setup_frame_dma(fbi, DMA_LOWER, PAL_NONE, nbytes, nbytes);
+
+        if (var->bits_per_pixel >= 16)
+                setup_frame_dma(fbi, DMA_BASE, PAL_NONE, 0, nbytes);
+        else
+                setup_frame_dma(fbi, DMA_BASE, PAL_BASE, 0, nbytes);
 
         fbi->reg_lccr0 = new_regs.lccr0;
         fbi->reg_lccr1 = new_regs.lccr1;
@@ -701,8 +698,8 @@ static int pxafb_activate_var(struct fb_var_screeninfo *var,
             (__raw_readl(fbi->mmio_base + LCCR1) != fbi->reg_lccr1) ||
             (__raw_readl(fbi->mmio_base + LCCR2) != fbi->reg_lccr2) ||
             (__raw_readl(fbi->mmio_base + LCCR3) != fbi->reg_lccr3) ||
-            (__raw_readl(fbi->mmio_base + FDADR0) != fbi->fdadr0) ||
-            (__raw_readl(fbi->mmio_base + FDADR1) != fbi->fdadr1))
+            (__raw_readl(fbi->mmio_base + FDADR0) != fbi->fdadr[0]) ||
+            (__raw_readl(fbi->mmio_base + FDADR1) != fbi->fdadr[1]))
                 pxafb_schedule_work(fbi, C_REENABLE);
 
         return 0;
@@ -777,8 +774,8 @@ static void pxafb_setup_gpio(struct pxafb_info *fbi)
 static void pxafb_enable_controller(struct pxafb_info *fbi)
 {
         pr_debug("pxafb: Enabling LCD controller\n");
-        pr_debug("fdadr0 0x%08x\n", (unsigned int) fbi->fdadr0);
-        pr_debug("fdadr1 0x%08x\n", (unsigned int) fbi->fdadr1);
+        pr_debug("fdadr0 0x%08x\n", (unsigned int) fbi->fdadr[0]);
+        pr_debug("fdadr1 0x%08x\n", (unsigned int) fbi->fdadr[1]);
         pr_debug("reg_lccr0 0x%08x\n", (unsigned int) fbi->reg_lccr0);
         pr_debug("reg_lccr1 0x%08x\n", (unsigned int) fbi->reg_lccr1);
         pr_debug("reg_lccr2 0x%08x\n", (unsigned int) fbi->reg_lccr2);
@@ -793,8 +790,8 @@ static void pxafb_enable_controller(struct pxafb_info *fbi)
         __raw_writel(fbi->reg_lccr1, fbi->mmio_base + LCCR1);
         __raw_writel(fbi->reg_lccr0 & ~LCCR0_ENB, fbi->mmio_base + LCCR0);
 
-        __raw_writel(fbi->fdadr0, fbi->mmio_base + FDADR0);
-        __raw_writel(fbi->fdadr1, fbi->mmio_base + FDADR1);
+        __raw_writel(fbi->fdadr[0], fbi->mmio_base + FDADR0);
+        __raw_writel(fbi->fdadr[1], fbi->mmio_base + FDADR1);
         __raw_writel(fbi->reg_lccr0 | LCCR0_ENB, fbi->mmio_base + LCCR0);
 }
 
@@ -1038,8 +1035,6 @@ static int pxafb_resume(struct platform_device *dev)
  */
 static int __init pxafb_map_video_memory(struct pxafb_info *fbi)
 {
-        u_long palette_mem_size;
-
         /*
          * We reserve one page for the palette, plus the size
          * of the framebuffer.
@@ -1062,14 +1057,9 @@ static int __init pxafb_map_video_memory(struct pxafb_info *fbi)
                 fbi->fb.fix.smem_start = fbi->screen_dma;
                 fbi->palette_size = fbi->fb.var.bits_per_pixel == 8 ? 256 : 16;
 
-                if ((fbi->lccr4 & LCCR4_PAL_FOR_MASK) == LCCR4_PAL_FOR_0)
-                        palette_mem_size = fbi->palette_size * sizeof(u16);
-                else
-                        palette_mem_size = fbi->palette_size * sizeof(u32);
-
-                fbi->palette_cpu = (u16 *)(fbi->map_cpu + PAGE_SIZE
-                                                - palette_mem_size);
-                fbi->palette_dma = fbi->map_dma + PAGE_SIZE - palette_mem_size;
+                fbi->dma_buff = (void *)fbi->map_cpu;
+                fbi->dma_buff_phys = fbi->map_dma;
+                fbi->palette_cpu = (u16 *)&fbi->dma_buff->palette[0];
         }
 
         return fbi->map_cpu ? 0 : -ENOMEM;
diff --git a/drivers/video/pxafb.h b/drivers/video/pxafb.h
index c7c561df3b6..b777641c5e7 100644
--- a/drivers/video/pxafb.h
+++ b/drivers/video/pxafb.h
@@ -37,6 +37,36 @@ struct pxafb_dma_descriptor {
         unsigned int ldcmd;
 };
 
+enum {
+        PAL_NONE        = -1,
+        PAL_BASE        = 0,
+        PAL_OV1         = 1,
+        PAL_OV2         = 2,
+        PAL_MAX,
+};
+
+enum {
+        DMA_BASE        = 0,
+        DMA_UPPER       = 0,
+        DMA_LOWER       = 1,
+        DMA_OV1         = 1,
+        DMA_OV2_Y       = 2,
+        DMA_OV2_Cb      = 3,
+        DMA_OV2_Cr      = 4,
+        DMA_CURSOR      = 5,
+        DMA_CMD         = 6,
+        DMA_MAX,
+};
+
+/* maximum palette size - 256 entries, each 4 bytes long */
+#define PALETTE_SIZE    (256 * 4)
+
+struct pxafb_dma_buff {
+        unsigned char palette[PAL_MAX * PALETTE_SIZE];
+        struct pxafb_dma_descriptor pal_desc[PAL_MAX];
+        struct pxafb_dma_descriptor dma_desc[DMA_MAX];
+};
+
 struct pxafb_info {
         struct fb_info          fb;
         struct device           *dev;
@@ -44,6 +74,10 @@ struct pxafb_info {
 
         void __iomem            *mmio_base;
 
+        struct pxafb_dma_buff   *dma_buff;
+        dma_addr_t              dma_buff_phys;
+        dma_addr_t              fdadr[DMA_MAX];
+
         /*
          * These are the addresses we mapped
          * the framebuffer memory region to.
@@ -57,20 +91,8 @@ struct pxafb_info {
         u_char *                screen_cpu;     /* virtual address of frame buffer */
         dma_addr_t              screen_dma;     /* physical address of frame buffer */
         u16 *                   palette_cpu;    /* virtual address of palette memory */
-        dma_addr_t              palette_dma;    /* physical address of palette memory */
         u_int                   palette_size;
 
-        /* DMA descriptors */
-        struct pxafb_dma_descriptor *   dmadesc_fblow_cpu;
-        dma_addr_t              dmadesc_fblow_dma;
-        struct pxafb_dma_descriptor *   dmadesc_fbhigh_cpu;
-        dma_addr_t              dmadesc_fbhigh_dma;
-        struct pxafb_dma_descriptor *   dmadesc_palette_cpu;
-        dma_addr_t              dmadesc_palette_dma;
-
-        dma_addr_t              fdadr0;
-        dma_addr_t              fdadr1;
-
         u_int                   lccr0;
         u_int                   lccr3;
         u_int                   lccr4;