s3c2410fb: source code improvements

This patch:
- moves more display mode preparations to s3c2410fb_check_var()
- reduces number of fields in s3c2410fb_info
- removes redundant values setting in s3c2410fb_probe()
- removes static mach_info pointer
- releases fb_info structure in s3c2410fb_remove()
- changes s3c2410fb_init to __init from __devinit
- fixes few typos in comments and removes unused includes

Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: Antonino Daplas <adaplas@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 76 insertions, 124 deletions

diff --git a/drivers/video/s3c2410fb.c b/drivers/video/s3c2410fb.c
index 2ecf7717491f..09d19633d3bc 100644
--- a/drivers/video/s3c2410fb.c
+++ b/drivers/video/s3c2410fb.c
@@ -20,7 +20,7 @@
  *
  * 2004-12-04: Arnaud Patard <arnaud.patard@rtp-net.org>
  *      - Added the possibility to set on or off the
- *      debugging mesaages
+ *      debugging messages
  *      - Replaced 0 and 1 by on or off when reading the
  *      /sys files
  *
@@ -31,7 +31,7 @@
  *      - add pixel clock divisor control
  *
  * 2004-11-11: Arnaud Patard <arnaud.patard@rtp-net.org>
- *      - Removed the use of currcon as it no more exist
+ *      - Removed the use of currcon as it no more exists
  *      - Added LCD power sysfs interface
  *
  * 2004-11-03: Ben Dooks <ben-linux@fluff.org>
@@ -82,13 +82,10 @@
 #include <linux/init.h>
 #include <linux/dma-mapping.h>
 #include <linux/interrupt.h>
-#include <linux/workqueue.h>
-#include <linux/wait.h>
 #include <linux/platform_device.h>
 #include <linux/clk.h>
 
 #include <asm/io.h>
-#include <asm/uaccess.h>
 #include <asm/div64.h>
 
 #include <asm/mach/map.h>
@@ -102,8 +99,6 @@
 
 #include "s3c2410fb.h"
 
-static struct s3c2410fb_mach_info *mach_info;
-
 /* Debugging stuff */
 #ifdef CONFIG_FB_S3C2410_DEBUG
 static int debug        = 1;
@@ -122,17 +117,16 @@ static int debug	= 0;
 static void s3c2410fb_set_lcdaddr(struct fb_info *info)
 {
         unsigned long saddr1, saddr2, saddr3;
-        int line_length = info->var.xres * info->var.bits_per_pixel;
         struct s3c2410fb_info *fbi = info->par;
         void __iomem *regs = fbi->io;
 
         saddr1  = info->fix.smem_start >> 1;
         saddr2  = info->fix.smem_start;
-        saddr2 += (line_length * info->var.yres) / 8;
+        saddr2 += info->fix.line_length * info->var.yres;
         saddr2 >>= 1;
 
         saddr3 = S3C2410_OFFSIZE(0) |
-                 S3C2410_PAGEWIDTH((line_length / 16) & 0x3ff);
+                 S3C2410_PAGEWIDTH((info->fix.line_length / 2) & 0x3ff);
 
         dprintk("LCDSADDR1 = 0x%08lx\n", saddr1);
         dprintk("LCDSADDR2 = 0x%08lx\n", saddr2);
@@ -153,14 +147,14 @@ static unsigned int s3c2410fb_calc_pixclk(struct s3c2410fb_info *fbi,
         unsigned long clk = clk_get_rate(fbi->clk);
         unsigned long long div;
 
-        /* pixclk is in picoseoncds, our clock is in Hz
+        /* pixclk is in picoseconds, our clock is in Hz
          *
          * Hz -> picoseconds is / 10^-12
          */
 
         div = (unsigned long long)clk * pixclk;
-        do_div(div, 1000000UL);
-        do_div(div, 1000000UL);
+        div >>= 12;                     /* div / 2^12 */
+        do_div(div, 625 * 625UL * 625); /* div / 5^12 */
 
         dprintk("pixclk %ld, divisor is %ld\n", pixclk, (long)div);
         return div;
@@ -176,7 +170,7 @@ static int s3c2410fb_check_var(struct fb_var_screeninfo *var,
                                struct fb_info *info)
 {
         struct s3c2410fb_info *fbi = info->par;
-        struct s3c2410fb_mach_info *mach_info = fbi->mach_info;
+        struct s3c2410fb_mach_info *mach_info = fbi->dev->platform_data;
         struct s3c2410fb_display *display = NULL;
         unsigned i;
 
@@ -189,7 +183,6 @@ static int s3c2410fb_check_var(struct fb_var_screeninfo *var,
                     var->xres == mach_info->displays[i].xres &&
                     var->bits_per_pixel == mach_info->displays[i].bpp) {
                         display = mach_info->displays + i;
-                        fbi->current_display = i;
                         break;
                 }
 
@@ -202,10 +195,22 @@ static int s3c2410fb_check_var(struct fb_var_screeninfo *var,
         /* it is always the size as the display */
         var->xres_virtual = display->xres;
         var->yres_virtual = display->yres;
+        var->height = display->height;
+        var->width = display->width;
 
         /* copy lcd settings */
         var->left_margin = display->left_margin;
         var->right_margin = display->right_margin;
+        var->upper_margin = display->upper_margin;
+        var->lower_margin = display->lower_margin;
+        var->vsync_len = display->vsync_len;
+        var->hsync_len = display->hsync_len;
+
+        fbi->regs.lcdcon1 = display->lcdcon1;
+        fbi->regs.lcdcon5 = display->lcdcon5;
+        /* set display type */
+        fbi->regs.lcdcon1 &= ~S3C2410_LCDCON1_TFT;
+        fbi->regs.lcdcon1 |= display->type;
 
         var->transp.offset = 0;
         var->transp.length = 0;
@@ -420,19 +425,13 @@ static void s3c2410fb_activate_var(struct fb_info *info)
 {
         struct s3c2410fb_info *fbi = info->par;
         void __iomem *regs = fbi->io;
+        int type = fbi->regs.lcdcon1 & S3C2410_LCDCON1_TFT;
         struct fb_var_screeninfo *var = &info->var;
-        struct s3c2410fb_mach_info *mach_info = fbi->mach_info;
-        struct s3c2410fb_display *display = mach_info->displays +
-                                            fbi->current_display;
-
-        /* set display type */
-        fbi->regs.lcdcon1 &= ~S3C2410_LCDCON1_TFT;
-        fbi->regs.lcdcon1 |= display->type;
 
         if (var->pixclock > 0) {
                 int clkdiv = s3c2410fb_calc_pixclk(fbi, var->pixclock);
 
-                if (display->type == S3C2410_LCDCON1_TFT) {
+                if (type == S3C2410_LCDCON1_TFT) {
                         clkdiv = (clkdiv / 2) - 1;
                         if (clkdiv < 0)
                                 clkdiv = 0;
@@ -446,7 +445,7 @@ static void s3c2410fb_activate_var(struct fb_info *info)
                 fbi->regs.lcdcon1 |=  S3C2410_LCDCON1_CLKVAL(clkdiv);
         }
 
-        if (display->type == S3C2410_LCDCON1_TFT)
+        if (type == S3C2410_LCDCON1_TFT)
                 s3c2410fb_calculate_tft_lcd_regs(info, &fbi->regs);
         else
                 s3c2410fb_calculate_stn_lcd_regs(info, &fbi->regs);
@@ -470,6 +469,7 @@ static void s3c2410fb_activate_var(struct fb_info *info)
         /* set lcd address pointers */
         s3c2410fb_set_lcdaddr(info);
 
+        fbi->regs.lcdcon1 |= S3C2410_LCDCON1_ENVID,
         writel(fbi->regs.lcdcon1, regs + S3C2410_LCDCON1);
 }
 
@@ -566,9 +566,9 @@ static int s3c2410fb_setcolreg(unsigned regno,
                 if (regno < 256) {
                         /* currently assume RGB 5-6-5 mode */
 
-                        val  = ((red   >>  0) & 0xf800);
-                        val |= ((green >>  5) & 0x07e0);
-                        val |= ((blue  >> 11) & 0x001f);
+                        val  = (red   >>  0) & 0xf800;
+                        val |= (green >>  5) & 0x07e0;
+                        val |= (blue  >> 11) & 0x001f;
 
                         writel(val, regs + S3C2410_TFTPAL(regno));
                         schedule_palette_update(fbi, regno, val);
@@ -606,9 +606,6 @@ static int s3c2410fb_blank(int blank_mode, struct fb_info *info)
 
         dprintk("blank(mode=%d, info=%p)\n", blank_mode, info);
 
-        if (mach_info == NULL)
-                return -EINVAL;
-
         if (blank_mode == FB_BLANK_UNBLANK)
                 writel(0x0, regs + S3C2410_TPAL);
         else {
@@ -624,13 +621,11 @@ static int s3c2410fb_debug_show(struct device *dev,
 {
         return snprintf(buf, PAGE_SIZE, "%s\n", debug ? "on" : "off");
 }
+
 static int s3c2410fb_debug_store(struct device *dev,
                                  struct device_attribute *attr,
                                  const char *buf, size_t len)
 {
-        if (mach_info == NULL)
-                return -EINVAL;
-
         if (len < 1)
                 return -EINVAL;
 
@@ -673,36 +668,35 @@ static struct fb_ops s3c2410fb_ops = {
 static int __init s3c2410fb_map_video_memory(struct fb_info *info)
 {
         struct s3c2410fb_info *fbi = info->par;
+        dma_addr_t map_dma;
+        unsigned map_size = PAGE_ALIGN(info->fix.smem_len);
 
         dprintk("map_video_memory(fbi=%p)\n", fbi);
 
-        fbi->map_size = PAGE_ALIGN(info->fix.smem_len + PAGE_SIZE);
-        fbi->map_cpu  = dma_alloc_writecombine(fbi->dev, fbi->map_size,
-                                               &fbi->map_dma, GFP_KERNEL);
+        info->screen_base = dma_alloc_writecombine(fbi->dev, map_size,
+                                                   &map_dma, GFP_KERNEL);
 
-        fbi->map_size = info->fix.smem_len;
-
-        if (fbi->map_cpu) {
+        if (info->screen_base) {
                 /* prevent initial garbage on screen */
                 dprintk("map_video_memory: clear %p:%08x\n",
-                        fbi->map_cpu, fbi->map_size);
-                memset(fbi->map_cpu, 0xf0, fbi->map_size);
+                        info->screen_base, map_size);
+                memset(info->screen_base, 0xf0, map_size);
 
-                fbi->screen_dma         = fbi->map_dma;
-                info->screen_base       = fbi->map_cpu;
-                info->fix.smem_start    = fbi->screen_dma;
+                info->fix.smem_start = map_dma;
 
-                dprintk("map_video_memory: dma=%08x cpu=%p size=%08x\n",
-                        fbi->map_dma, fbi->map_cpu, info->fix.smem_len);
+                dprintk("map_video_memory: dma=%08lx cpu=%p size=%08x\n",
+                        info->fix.smem_start, info->screen_base, map_size);
         }
 
-        return fbi->map_cpu ? 0 : -ENOMEM;
+        return info->screen_base ? 0 : -ENOMEM;
 }
 
-static inline void s3c2410fb_unmap_video_memory(struct s3c2410fb_info *fbi)
+static inline void s3c2410fb_unmap_video_memory(struct fb_info *info)
 {
-        dma_free_writecombine(fbi->dev, fbi->map_size, fbi->map_cpu,
-                              fbi->map_dma);
+        struct s3c2410fb_info *fbi = info->par;
+
+        dma_free_writecombine(fbi->dev, PAGE_ALIGN(info->fix.smem_len),
+                              info->screen_base, info->fix.smem_start);
 }
 
 static inline void modify_gpio(void __iomem *reg,
@@ -720,6 +714,7 @@ static inline void modify_gpio(void __iomem *reg,
 static int s3c2410fb_init_registers(struct fb_info *info)
 {
         struct s3c2410fb_info *fbi = info->par;
+        struct s3c2410fb_mach_info *mach_info = fbi->dev->platform_data;
         unsigned long flags;
         void __iomem *regs = fbi->io;
 
@@ -736,14 +731,6 @@ static int s3c2410fb_init_registers(struct fb_info *info)
 
         local_irq_restore(flags);
 
-        writel(fbi->regs.lcdcon1, regs + S3C2410_LCDCON1);
-        writel(fbi->regs.lcdcon2, regs + S3C2410_LCDCON2);
-        writel(fbi->regs.lcdcon3, regs + S3C2410_LCDCON3);
-        writel(fbi->regs.lcdcon4, regs + S3C2410_LCDCON4);
-        writel(fbi->regs.lcdcon5, regs + S3C2410_LCDCON5);
-
-        s3c2410fb_set_lcdaddr(info);
-
         dprintk("LPCSEL    = 0x%08lx\n", mach_info->lpcsel);
         writel(mach_info->lpcsel, regs + S3C2410_LPCSEL);
 
@@ -752,9 +739,6 @@ static int s3c2410fb_init_registers(struct fb_info *info)
         /* ensure temporary palette disabled */
         writel(0x00, regs + S3C2410_TPAL);
 
-        /* Enable video by setting the ENVID bit to 1 */
-        fbi->regs.lcdcon1 |= S3C2410_LCDCON1_ENVID;
-        writel(fbi->regs.lcdcon1, regs + S3C2410_LCDCON1);
         return 0;
 }
 
@@ -808,6 +792,7 @@ static int __init s3c2410fb_probe(struct platform_device *pdev)
         struct s3c2410fb_info *info;
         struct s3c2410fb_display *display;
         struct fb_info *fbinfo;
+        struct s3c2410fb_mach_info *mach_info;
         struct resource *res;
         int ret;
         int irq;
@@ -834,6 +819,8 @@ static int __init s3c2410fb_probe(struct platform_device *pdev)
         if (!fbinfo)
                 return -ENOMEM;
 
+        platform_set_drvdata(pdev, fbinfo);
+
         info = fbinfo->par;
         info->dev = &pdev->dev;
 
@@ -859,23 +846,14 @@ static int __init s3c2410fb_probe(struct platform_device *pdev)
                 goto release_mem;
         }
 
-        platform_set_drvdata(pdev, fbinfo);
-
         dprintk("devinit\n");
 
         strcpy(fbinfo->fix.id, driver_name);
 
-        info->regs.lcdcon1 = display->lcdcon1;
-        info->regs.lcdcon5 = display->lcdcon5;
-
-        /* Stop the video and unset ENVID if set */
-        info->regs.lcdcon1 &= ~S3C2410_LCDCON1_ENVID;
+        /* Stop the video */
         lcdcon1 = readl(info->io + S3C2410_LCDCON1);
         writel(lcdcon1 & ~S3C2410_LCDCON1_ENVID, info->io + S3C2410_LCDCON1);
 
-        info->mach_info             = pdev->dev.platform_data;
-        info->current_display       = mach_info->default_display;
-
         fbinfo->fix.type            = FB_TYPE_PACKED_PIXELS;
         fbinfo->fix.type_aux        = 0;
         fbinfo->fix.xpanstep        = 0;
@@ -885,8 +863,6 @@ static int __init s3c2410fb_probe(struct platform_device *pdev)
 
         fbinfo->var.nonstd          = 0;
         fbinfo->var.activate        = FB_ACTIVATE_NOW;
-        fbinfo->var.height          = display->height;
-        fbinfo->var.width           = display->width;
         fbinfo->var.accel_flags     = 0;
         fbinfo->var.vmode           = FB_VMODE_NONINTERLACED;
 
@@ -894,39 +870,6 @@ static int __init s3c2410fb_probe(struct platform_device *pdev)
         fbinfo->flags               = FBINFO_FLAG_DEFAULT;
         fbinfo->pseudo_palette      = &info->pseudo_pal;
 
-        fbinfo->var.xres            = display->xres;
-        fbinfo->var.xres_virtual    = display->xres;
-        fbinfo->var.yres            = display->yres;
-        fbinfo->var.yres_virtual    = display->yres;
-        fbinfo->var.bits_per_pixel  = display->bpp;
-        fbinfo->var.left_margin     = display->left_margin;
-        fbinfo->var.right_margin    = display->right_margin;
-
-        fbinfo->var.upper_margin    = display->upper_margin;
-        fbinfo->var.lower_margin    = display->lower_margin;
-        fbinfo->var.vsync_len       = display->vsync_len;
-        fbinfo->var.hsync_len       = display->hsync_len;
-
-        fbinfo->var.red.offset      = 11;
-        fbinfo->var.green.offset    = 5;
-        fbinfo->var.blue.offset     = 0;
-        fbinfo->var.transp.offset   = 0;
-        fbinfo->var.red.length      = 5;
-        fbinfo->var.green.length    = 6;
-        fbinfo->var.blue.length     = 5;
-        fbinfo->var.transp.length   = 0;
-
-        /* find maximum required memory size for display */
-        for (i = 0; i < mach_info->num_displays; i++) {
-                unsigned long smem_len = mach_info->displays[i].xres;
-
-                smem_len *= mach_info->displays[i].yres;
-                smem_len *= mach_info->displays[i].bpp;
-                smem_len >>= 3;
-                if (fbinfo->fix.smem_len < smem_len)
-                        fbinfo->fix.smem_len = smem_len;
-        }
-
         for (i = 0; i < 256; i++)
                 info->palette_buffer[i] = PALETTE_BUFF_CLEAR;
 
@@ -949,6 +892,17 @@ static int __init s3c2410fb_probe(struct platform_device *pdev)
 
         msleep(1);
 
+        /* find maximum required memory size for display */
+        for (i = 0; i < mach_info->num_displays; i++) {
+                unsigned long smem_len = mach_info->displays[i].xres;
+
+                smem_len *= mach_info->displays[i].yres;
+                smem_len *= mach_info->displays[i].bpp;
+                smem_len >>= 3;
+                if (fbinfo->fix.smem_len < smem_len)
+                        fbinfo->fix.smem_len = smem_len;
+        }
+
         /* Initialize video memory */
         ret = s3c2410fb_map_video_memory(fbinfo);
         if (ret) {
@@ -959,6 +913,10 @@ static int __init s3c2410fb_probe(struct platform_device *pdev)
 
         dprintk("got video memory\n");
 
+        fbinfo->var.xres = display->xres;
+        fbinfo->var.yres = display->yres;
+        fbinfo->var.bits_per_pixel = display->bpp;
+
         s3c2410fb_init_registers(fbinfo);
 
         s3c2410fb_check_var(&fbinfo->var, fbinfo);
@@ -979,7 +937,7 @@ static int __init s3c2410fb_probe(struct platform_device *pdev)
         return 0;
 
 free_video_memory:
-        s3c2410fb_unmap_video_memory(info);
+        s3c2410fb_unmap_video_memory(fbinfo);
 release_clock:
         clk_disable(info->clk);
         clk_put(info->clk);
@@ -991,6 +949,7 @@ release_mem:
         release_resource(info->mem);
         kfree(info->mem);
 dealloc_fb:
+        platform_set_drvdata(pdev, NULL);
         framebuffer_release(fbinfo);
         return ret;
 }
@@ -1020,10 +979,12 @@ static int s3c2410fb_remove(struct platform_device *pdev)
         struct s3c2410fb_info *info = fbinfo->par;
         int irq;
 
+        unregister_framebuffer(fbinfo);
+
         s3c2410fb_stop_lcd(info);
         msleep(1);
 
-        s3c2410fb_unmap_video_memory(info);
+        s3c2410fb_unmap_video_memory(fbinfo);
 
         if (info->clk) {
                 clk_disable(info->clk);
@@ -1034,10 +995,13 @@ static int s3c2410fb_remove(struct platform_device *pdev)
         irq = platform_get_irq(pdev, 0);
         free_irq(irq, info);
 
+        iounmap(info->io);
+
         release_resource(info->mem);
         kfree(info->mem);
-        iounmap(info->io);
-        unregister_framebuffer(fbinfo);
+
+        platform_set_drvdata(pdev, NULL);
+        framebuffer_release(fbinfo);
 
         return 0;
 }
@@ -1091,7 +1055,7 @@ static struct platform_driver s3c2410fb_driver = {
         },
 };
 
-int __devinit s3c2410fb_init(void)
+int __init s3c2410fb_init(void)
 {
         return platform_driver_register(&s3c2410fb_driver);
 }
diff --git a/drivers/video/s3c2410fb.h b/drivers/video/s3c2410fb.h
index 9e86fffccb32..6ce5dc26c5f7 100644
--- a/drivers/video/s3c2410fb.h
+++ b/drivers/video/s3c2410fb.h
@@ -16,7 +16,7 @@
  *
  * 2004-09-07: Arnaud Patard <arnaud.patard@rtp-net.org>
  *      - Renamed from h1940fb.h to s3c2410fb.h
- *      - Chenged h1940 to s3c2410
+ *      - Changed h1940 to s3c2410
  *
  * 2004-07-15: Arnaud Patard <arnaud.patard@rtp-net.org>
  *      - First version
@@ -32,20 +32,8 @@ struct s3c2410fb_info {
         struct resource         *mem;
         void __iomem            *io;
 
-        struct s3c2410fb_mach_info *mach_info;
-
-        unsigned current_display;
-
-        /* raw memory addresses */
-        dma_addr_t              map_dma;        /* physical */
-        u_char *                map_cpu;        /* virtual */
-        u_int                   map_size;
-
         struct s3c2410fb_hw     regs;
 
-        /* addresses of pieces placed in raw buffer */
-        u_char *                screen_cpu;     /* virtual address of buffer */
-        dma_addr_t              screen_dma;     /* physical address of buffer */
         unsigned int            palette_ready;
 
         /* keep these registers in case we need to re-write palette */