pm3fb: mtrr support and noaccel option

This patch adds usage of MTRR registers and two new options: noaccel and
nomtrr.

[bunk@kernel.org: make pm3fb_init() static again]
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>

1 files changed, 78 insertions, 2 deletions

diff --git a/drivers/video/pm3fb.c b/drivers/video/pm3fb.c
index 88af0721f305..195bcdbc66b5 100644
--- a/drivers/video/pm3fb.c
+++ b/drivers/video/pm3fb.c
@@ -32,6 +32,9 @@
 #include <linux/fb.h>
 #include <linux/init.h>
 #include <linux/pci.h>
+#ifdef CONFIG_MTRR
+#include <asm/mtrr.h>
+#endif
 
 #include <video/pm3fb.h>
 
@@ -52,6 +55,12 @@
  * Driver data
  */
 static char *mode_option __devinitdata;
+static int noaccel   __devinitdata = 0;
+
+/* mtrr option */
+#ifdef CONFIG_MTRR
+static int nomtrr __devinitdata = 0;
+#endif
 
 /*
  * This structure defines the hardware state of the graphics card. Normally
@@ -65,6 +74,7 @@ struct pm3_par {
         u32             video;          /* video flags before blanking */
         u32             base;           /* screen base (xoffset+yoffset) in 128 bits unit */
         u32             palette[16];
+        int             mtrr_handle;
 };
 
 /*
@@ -1244,6 +1254,13 @@ static int __devinit pm3fb_probe(struct pci_dev *dev,
         }
         info->screen_size = pm3fb_fix.smem_len;
 
+#ifdef CONFIG_MTRR
+        if (!nomtrr) {
+                par->mtrr_handle = mtrr_add(pm3fb_fix.smem_start,
+                                                pm3fb_fix.smem_len,
+                                                MTRR_TYPE_WRCOMB, 1);
+        }
+#endif
         info->fbops = &pm3fb_ops;
 
         par->video = PM3_READ_REG(par, PM3VideoControl);
@@ -1257,6 +1274,10 @@ static int __devinit pm3fb_probe(struct pci_dev *dev,
                         FBINFO_HWACCEL_IMAGEBLIT |
                         FBINFO_HWACCEL_FILLRECT;
 
+        if (noaccel) {
+                printk(KERN_DEBUG "disabling acceleration\n");
+                info->flags |= FBINFO_HWACCEL_DISABLED;
+        }
         info->pixmap.addr = kmalloc(PM3_PIXMAP_SIZE, GFP_KERNEL);
         if (!info->pixmap.addr) {
                 retval = -ENOMEM;
@@ -1330,6 +1351,11 @@ static void __devexit pm3fb_remove(struct pci_dev *dev)
                 unregister_framebuffer(info);
                 fb_dealloc_cmap(&info->cmap);
 
+#ifdef CONFIG_MTRR
+        if (par->mtrr_handle >= 0)
+                mtrr_del(par->mtrr_handle, info->fix.smem_start,
+                         info->fix.smem_len);
+#endif /* CONFIG_MTRR */
                 iounmap(info->screen_base);
                 release_mem_region(fix->smem_start, fix->smem_len);
                 iounmap(par->v_regs);
@@ -1357,22 +1383,72 @@ static struct pci_driver pm3fb_driver = {
 
 MODULE_DEVICE_TABLE(pci, pm3fb_id_table);
 
+#ifndef MODULE
+        /*
+         *  Setup
+         */
+
+/*
+ * Only necessary if your driver takes special options,
+ * otherwise we fall back on the generic fb_setup().
+ */
+static int __init pm3fb_setup(char *options)
+{
+        char *this_opt;
+
+        /* Parse user speficied options (`video=pm3fb:') */
+        if (!options || !*options)
+                return 0;
+
+        while ((this_opt = strsep(&options, ",")) != NULL) {
+                if (!*this_opt)
+                        continue;
+                else if (!strncmp(this_opt, "noaccel", 7)) {
+                        noaccel = 1;
+#ifdef CONFIG_MTRR
+                } else if (!strncmp(this_opt, "nomtrr", 6)) {
+                        nomtrr = 1;
+#endif
+                } else {
+                        mode_option = this_opt;
+                }
+        }
+        return 0;
+}
+#endif /* MODULE */
+
 static int __init pm3fb_init(void)
 {
+        /*
+         *  For kernel boot options (in 'video=pm3fb:<options>' format)
+         */
 #ifndef MODULE
-        if (fb_get_options("pm3fb", NULL))
+        char *option = NULL;
+
+        if (fb_get_options("pm3fb", &option))
                 return -ENODEV;
+        pm3fb_setup(option);
 #endif
+
         return pci_register_driver(&pm3fb_driver);
 }
 
+#ifdef MODULE
 static void __exit pm3fb_exit(void)
 {
         pci_unregister_driver(&pm3fb_driver);
 }
 
-module_init(pm3fb_init);
 module_exit(pm3fb_exit);
+#endif
+module_init(pm3fb_init);
+
+module_param(noaccel, bool, 0);
+MODULE_PARM_DESC(noaccel, "Disable acceleration");
+#ifdef CONFIG_MTRR
+module_param(nomtrr, bool, 0);
+MODULE_PARM_DESC(nomtrr, "Disable MTRR support (0 or 1=disabled) (default=0)");
+#endif
 
 MODULE_DESCRIPTION("Permedia3 framebuffer device driver");
 MODULE_LICENSE("GPL");