i.MX Framebuffer: Use readl/writel instead of direct pointer deref

This patch prepares the current i.MX1 framebuffer driver for usage in the
whole i.MX family. It switches to readl/writel for register accesses.
Also it moves the register definitions to the driver where they belong.

Acked-by: Krzysztof Helt <krzysztof.h1@poczta.fm>
Signed-off-by: Juergen Beisert <j.beisert@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

2 files changed, 130 insertions, 66 deletions

diff --git a/drivers/video/imxfb.c b/drivers/video/imxfb.c
index a990d432f524..1bccf5ad0c7d 100644
--- a/drivers/video/imxfb.c
+++ b/drivers/video/imxfb.c
@@ -16,7 +16,6 @@
  *      linux-arm-kernel@lists.arm.linux.org.uk
  */
 
-//#define DEBUG 1
 
 #include <linux/module.h>
 #include <linux/kernel.h>
@@ -32,9 +31,8 @@
 #include <linux/cpufreq.h>
 #include <linux/platform_device.h>
 #include <linux/dma-mapping.h>
+#include <linux/io.h>
 
-#include <mach/hardware.h>
-#include <asm/io.h>
 #include <mach/imxfb.h>
 
 /*
@@ -44,6 +42,73 @@
 
 #include "imxfb.h"
 
+#define DRIVER_NAME "imx-fb"
+
+#define LCDC_SSA        0x00
+
+#define LCDC_SIZE       0x04
+#define SIZE_XMAX(x)    ((((x) >> 4) & 0x3f) << 20)
+#define SIZE_YMAX(y)    ((y) & 0x1ff)
+
+#define LCDC_VPW        0x08
+#define VPW_VPW(x)      ((x) & 0x3ff)
+
+#define LCDC_CPOS       0x0C
+#define CPOS_CC1        (1<<31)
+#define CPOS_CC0        (1<<30)
+#define CPOS_OP         (1<<28)
+#define CPOS_CXP(x)     (((x) & 3ff) << 16)
+#define CPOS_CYP(y)     ((y) & 0x1ff)
+
+#define LCDC_LCWHB      0x10
+#define LCWHB_BK_EN     (1<<31)
+#define LCWHB_CW(w)     (((w) & 0x1f) << 24)
+#define LCWHB_CH(h)     (((h) & 0x1f) << 16)
+#define LCWHB_BD(x)     ((x) & 0xff)
+
+#define LCDC_LCHCC      0x14
+#define LCHCC_CUR_COL_R(r) (((r) & 0x1f) << 11)
+#define LCHCC_CUR_COL_G(g) (((g) & 0x3f) << 5)
+#define LCHCC_CUR_COL_B(b) ((b) & 0x1f)
+
+#define LCDC_PCR        0x18
+
+#define LCDC_HCR        0x1C
+#define HCR_H_WIDTH(x)  (((x) & 0x3f) << 26)
+#define HCR_H_WAIT_1(x) (((x) & 0xff) << 8)
+#define HCR_H_WAIT_2(x) ((x) & 0xff)
+
+#define LCDC_VCR        0x20
+#define VCR_V_WIDTH(x)  (((x) & 0x3f) << 26)
+#define VCR_V_WAIT_1(x) (((x) & 0xff) << 8)
+#define VCR_V_WAIT_2(x) ((x) & 0xff)
+
+#define LCDC_POS        0x24
+#define POS_POS(x)      ((x) & 1f)
+
+#define LCDC_LSCR1      0x28
+/* bit fields in imxfb.h */
+
+#define LCDC_PWMR       0x2C
+/* bit fields in imxfb.h */
+
+#define LCDC_DMACR      0x30
+/* bit fields in imxfb.h */
+
+#define LCDC_RMCR       0x34
+#define RMCR_LCDC_EN    (1<<1)
+#define RMCR_SELF_REF   (1<<0)
+
+#define LCDC_LCDICR     0x38
+#define LCDICR_INT_SYN  (1<<2)
+#define LCDICR_INT_CON  (1)
+
+#define LCDC_LCDISR     0x40
+#define LCDISR_UDR_ERR  (1<<3)
+#define LCDISR_ERR_RES  (1<<2)
+#define LCDISR_EOF      (1<<1)
+#define LCDISR_BOF      (1<<0)
+
 static struct imxfb_rgb def_rgb_16 = {
         .red    = { .offset = 8,  .length = 4, },
         .green  = { .offset = 4,  .length = 4, },
@@ -67,7 +132,6 @@ static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
         return chan << bf->offset;
 }
 
-#define LCDC_PALETTE(x) __REG2(IMX_LCDC_BASE+0x800, (x)<<2)
 static int
 imxfb_setpalettereg(u_int regno, u_int red, u_int green, u_int blue,
                        u_int trans, struct fb_info *info)
@@ -81,7 +145,7 @@ imxfb_setpalettereg(u_int regno, u_int red, u_int green, u_int blue,
                       (CNVT_TOHW(green,4) << 4) |
                       CNVT_TOHW(blue,  4);
 
-                LCDC_PALETTE(regno) = val;
+                writel(val, fbi->regs + 0x800 + (regno << 2));
                 ret = 0;
         }
         return ret;
@@ -235,18 +299,23 @@ static void imxfb_enable_controller(struct imxfb_info *fbi)
         pr_debug("Enabling LCD controller\n");
 
         /* initialize LCDC */
-        LCDC_RMCR &= ~RMCR_LCDC_EN;             /* just to be safe... */
+        writel(readl(fbi->regs + LCDC_RMCR) & ~RMCR_LCDC_EN,
+                fbi->regs + LCDC_RMCR); /* just to be safe... */
+
+        writel(fbi->screen_dma, fbi->regs + LCDC_SSA);
 
-        LCDC_SSA        = fbi->screen_dma;
         /* physical screen start address            */
-        LCDC_VPW        = VPW_VPW(fbi->max_xres * fbi->max_bpp / 8 / 4);
+        writel(VPW_VPW(fbi->max_xres * fbi->max_bpp / 8 / 4),
+                fbi->regs + LCDC_VPW);
 
-        LCDC_POS        = 0x00000000;   /* panning offset 0 (0 pixel offset)        */
+        /* panning offset 0 (0 pixel offset)        */
+        writel(0x00000000, fbi->regs + LCDC_POS);
 
         /* disable hardware cursor */
-        LCDC_CPOS       &= ~(CPOS_CC0 | CPOS_CC1);
+        writel(readl(fbi->regs + LCDC_CPOS) & ~(CPOS_CC0 | CPOS_CC1),
+                fbi->regs + LCDC_CPOS);
 
-        LCDC_RMCR = RMCR_LCDC_EN;
+        writel(RMCR_LCDC_EN, fbi->regs + LCDC_RMCR);
 
         if(fbi->backlight_power)
                 fbi->backlight_power(1);
@@ -263,7 +332,7 @@ static void imxfb_disable_controller(struct imxfb_info *fbi)
         if(fbi->lcd_power)
                 fbi->lcd_power(0);
 
-        LCDC_RMCR = 0;
+        writel(0, fbi->regs + LCDC_RMCR);
 }
 
 static int imxfb_blank(int blank, struct fb_info *info)
@@ -340,19 +409,22 @@ static int imxfb_activate_var(struct fb_var_screeninfo *var, struct fb_info *inf
                         info->fix.id, var->lower_margin);
 #endif
 
-        LCDC_HCR        = HCR_H_WIDTH(var->hsync_len) |
-                          HCR_H_WAIT_1(var->left_margin) |
-                          HCR_H_WAIT_2(var->right_margin);
+        writel(HCR_H_WIDTH(var->hsync_len) |
+                HCR_H_WAIT_1(var->left_margin) |
+                HCR_H_WAIT_2(var->right_margin),
+                fbi->regs + LCDC_HCR);
 
-        LCDC_VCR        = VCR_V_WIDTH(var->vsync_len) |
-                          VCR_V_WAIT_1(var->upper_margin) |
-                          VCR_V_WAIT_2(var->lower_margin);
+        writel(VCR_V_WIDTH(var->vsync_len) |
+                VCR_V_WAIT_1(var->upper_margin) |
+                VCR_V_WAIT_2(var->lower_margin),
+                fbi->regs + LCDC_VCR);
 
-        LCDC_SIZE       = SIZE_XMAX(var->xres) | SIZE_YMAX(var->yres);
-        LCDC_PCR        = fbi->pcr;
-        LCDC_PWMR       = fbi->pwmr;
-        LCDC_LSCR1      = fbi->lscr1;
-        LCDC_DMACR      = fbi->dmacr;
+        writel(SIZE_XMAX(var->xres) | SIZE_YMAX(var->yres),
+                        fbi->regs + LCDC_SIZE);
+        writel(fbi->pcr, fbi->regs + LCDC_PCR);
+        writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
+        writel(fbi->lscr1, fbi->regs + LCDC_LSCR1);
+        writel(fbi->dmacr, fbi->regs + LCDC_DMACR);
 
         return 0;
 }
@@ -384,10 +456,10 @@ static int imxfb_resume(struct platform_device *dev)
 #define imxfb_resume    NULL
 #endif
 
-static int __init imxfb_init_fbinfo(struct device *dev)
+static int __init imxfb_init_fbinfo(struct platform_device *pdev)
 {
-        struct imxfb_mach_info *inf = dev->platform_data;
-        struct fb_info *info = dev_get_drvdata(dev);
+        struct imxfb_mach_info *inf = pdev->dev.platform_data;
+        struct fb_info *info = dev_get_drvdata(&pdev->dev);
         struct imxfb_info *fbi = info->par;
 
         pr_debug("%s\n",__func__);
@@ -397,7 +469,6 @@ static int __init imxfb_init_fbinfo(struct device *dev)
                 return -ENOMEM;
 
         memset(fbi, 0, sizeof(struct imxfb_info));
-        fbi->dev = dev;
 
         strlcpy(info->fix.id, IMX_NAME, sizeof(info->fix.id));
 
@@ -453,31 +524,6 @@ static int __init imxfb_init_fbinfo(struct device *dev)
         return 0;
 }
 
-/*
- *      Allocates the DRAM memory for the frame buffer.  This buffer is
- *      remapped into a non-cached, non-buffered, memory region to
- *      allow pixel writes to occur without flushing the cache.
- *      Once this area is remapped, all virtual memory access to the
- *      video memory should occur at the new region.
- */
-static int __init imxfb_map_video_memory(struct fb_info *info)
-{
-        struct imxfb_info *fbi = info->par;
-
-        fbi->map_size = PAGE_ALIGN(info->fix.smem_len);
-        fbi->map_cpu = dma_alloc_writecombine(fbi->dev, fbi->map_size,
-                                        &fbi->map_dma,GFP_KERNEL);
-
-        if (fbi->map_cpu) {
-                info->screen_base = fbi->map_cpu;
-                fbi->screen_cpu = fbi->map_cpu;
-                fbi->screen_dma = fbi->map_dma;
-                info->fix.smem_start = fbi->screen_dma;
-        }
-
-        return fbi->map_cpu ? 0 : -ENOMEM;
-}
-
 static int __init imxfb_probe(struct platform_device *pdev)
 {
         struct imxfb_info *fbi;
@@ -506,23 +552,38 @@ static int __init imxfb_probe(struct platform_device *pdev)
 
         platform_set_drvdata(pdev, info);
 
-        ret = imxfb_init_fbinfo(&pdev->dev);
+        ret = imxfb_init_fbinfo(pdev);
         if( ret < 0 )
                 goto failed_init;
 
-        res = request_mem_region(res->start, res->end - res->start + 1, "IMXFB");
+        res = request_mem_region(res->start, resource_size(res),
+                                DRIVER_NAME);
         if (!res) {
                 ret = -EBUSY;
-                goto failed_regs;
+                goto failed_req;
+        }
+
+        fbi->regs = ioremap(res->start, resource_size(res));
+        if (fbi->regs == NULL) {
+                printk(KERN_ERR"Cannot map frame buffer registers\n");
+                goto failed_ioremap;
         }
 
         if (!inf->fixed_screen_cpu) {
-                ret = imxfb_map_video_memory(info);
-                if (ret) {
+                fbi->map_size = PAGE_ALIGN(info->fix.smem_len);
+                fbi->map_cpu = dma_alloc_writecombine(&pdev->dev,
+                                fbi->map_size, &fbi->map_dma, GFP_KERNEL);
+
+                if (!fbi->map_cpu) {
                         dev_err(&pdev->dev, "Failed to allocate video RAM: %d\n", ret);
                         ret = -ENOMEM;
                         goto failed_map;
                 }
+
+                info->screen_base = fbi->map_cpu;
+                fbi->screen_cpu = fbi->map_cpu;
+                fbi->screen_dma = fbi->map_dma;
+                info->fix.smem_start = fbi->screen_dma;
         } else {
                 /* Fixed framebuffer mapping enables location of the screen in eSRAM */
                 fbi->map_cpu = inf->fixed_screen_cpu;
@@ -559,18 +620,20 @@ failed_register:
 failed_cmap:
         if (!inf->fixed_screen_cpu)
                 dma_free_writecombine(&pdev->dev,fbi->map_size,fbi->map_cpu,
-                           fbi->map_dma);
+                        fbi->map_dma);
 failed_map:
-        kfree(info->pseudo_palette);
-failed_regs:
+        iounmap(fbi->regs);
+failed_ioremap:
         release_mem_region(res->start, res->end - res->start);
+failed_req:
+        kfree(info->pseudo_palette);
 failed_init:
         platform_set_drvdata(pdev, NULL);
         framebuffer_release(info);
         return ret;
 }
 
-static int imxfb_remove(struct platform_device *pdev)
+static int __devexit imxfb_remove(struct platform_device *pdev)
 {
         struct fb_info *info = platform_get_drvdata(pdev);
         struct imxfb_info *fbi = info->par;
@@ -586,6 +649,7 @@ static int imxfb_remove(struct platform_device *pdev)
         kfree(info->pseudo_palette);
         framebuffer_release(info);
 
+        iounmap(fbi->regs);
         release_mem_region(res->start, res->end - res->start + 1);
         platform_set_drvdata(pdev, NULL);
 
@@ -600,19 +664,18 @@ void  imxfb_shutdown(struct platform_device * dev)
 }
 
 static struct platform_driver imxfb_driver = {
-        .probe          = imxfb_probe,
         .suspend        = imxfb_suspend,
         .resume         = imxfb_resume,
-        .remove         = imxfb_remove,
+        .remove         = __devexit_p(imxfb_remove),
         .shutdown       = imxfb_shutdown,
         .driver         = {
-                .name   = "imx-fb",
+                .name   = DRIVER_NAME,
         },
 };
 
 int __init imxfb_init(void)
 {
-        return platform_driver_register(&imxfb_driver);
+        return platform_driver_probe(&imxfb_driver, imxfb_probe);
 }
 
 static void __exit imxfb_cleanup(void)
diff --git a/drivers/video/imxfb.h b/drivers/video/imxfb.h
index e837a8b48eb8..baa86a0fe29e 100644
--- a/drivers/video/imxfb.h
+++ b/drivers/video/imxfb.h
@@ -29,7 +29,8 @@ struct imxfb_rgb {
 #define NR_RGB  2
 
 struct imxfb_info {
-        struct device           *dev;
+        void __iomem            *regs;
+
         struct imxfb_rgb        *rgb[NR_RGB];
 
         u_int                   max_bpp;