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android_kernel_motorola_sm6225/drivers/video/p9100.c
David S. Miller c7f439b99e [VIDEO]: Fix OOPS in all SBUS framebuffer drivers. 
All of these drivers use a silly:

struct all_info {
	struct fb_info info;
	struct foo_par par;
};

struct all_info *all = kzalloc(sizeof(*all), GFP_KERNEL);
all->info.par = &all->par;

etc. etc. code sequence, basically replicating the provided
framebuffer_alloc()/framebuffer_release(), and doing it badly.

Not only is this massive code duplication, it also caused a
bug in that we weren't setting the fb_info->device pointer
which results in an OOPS when fb_is_primary_device() runs.

Fix all of this by using framebuffer_{alloc,release}() and
passing in "&of_device->dev" as the device pointer.

Signed-off-by: David S. Miller <davem@davemloft.net>
2007-07-30 00:27:33 -07:00

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/* p9100.c: P9100 frame buffer driver
*
* Copyright (C) 2003, 2006 David S. Miller (davem@davemloft.net)
* Copyright 1999 Derrick J Brashear (shadow@dementia.org)
*
* Driver layout based loosely on tgafb.c, see that file for credits.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/fb.h>
#include <linux/mm.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/of_device.h>
#include <asm/fbio.h>
#include "sbuslib.h"
/*
* Local functions.
*/
static int p9100_setcolreg(unsigned, unsigned, unsigned, unsigned,
unsigned, struct fb_info *);
static int p9100_blank(int, struct fb_info *);
static int p9100_mmap(struct fb_info *, struct vm_area_struct *);
static int p9100_ioctl(struct fb_info *, unsigned int, unsigned long);
/*
* Frame buffer operations
*/
static struct fb_ops p9100_ops = {
.owner = THIS_MODULE,
.fb_setcolreg = p9100_setcolreg,
.fb_blank = p9100_blank,
.fb_fillrect = cfb_fillrect,
.fb_copyarea = cfb_copyarea,
.fb_imageblit = cfb_imageblit,
.fb_mmap = p9100_mmap,
.fb_ioctl = p9100_ioctl,
#ifdef CONFIG_COMPAT
.fb_compat_ioctl = sbusfb_compat_ioctl,
#endif
};
/* P9100 control registers */
#define P9100_SYSCTL_OFF 0x0UL
#define P9100_VIDEOCTL_OFF 0x100UL
#define P9100_VRAMCTL_OFF 0x180UL
#define P9100_RAMDAC_OFF 0x200UL
#define P9100_VIDEOCOPROC_OFF 0x400UL
/* P9100 command registers */
#define P9100_CMD_OFF 0x0UL
/* P9100 framebuffer memory */
#define P9100_FB_OFF 0x0UL
/* 3 bits: 2=8bpp 3=16bpp 5=32bpp 7=24bpp */
#define SYS_CONFIG_PIXELSIZE_SHIFT 26
#define SCREENPAINT_TIMECTL1_ENABLE_VIDEO 0x20 /* 0 = off, 1 = on */
struct p9100_regs {
/* Registers for the system control */
u32 sys_base;
u32 sys_config;
u32 sys_intr;
u32 sys_int_ena;
u32 sys_alt_rd;
u32 sys_alt_wr;
u32 sys_xxx[58];
/* Registers for the video control */
u32 vid_base;
u32 vid_hcnt;
u32 vid_htotal;
u32 vid_hsync_rise;
u32 vid_hblank_rise;
u32 vid_hblank_fall;
u32 vid_hcnt_preload;
u32 vid_vcnt;
u32 vid_vlen;
u32 vid_vsync_rise;
u32 vid_vblank_rise;
u32 vid_vblank_fall;
u32 vid_vcnt_preload;
u32 vid_screenpaint_addr;
u32 vid_screenpaint_timectl1;
u32 vid_screenpaint_qsfcnt;
u32 vid_screenpaint_timectl2;
u32 vid_xxx[15];
/* Registers for the video control */
u32 vram_base;
u32 vram_memcfg;
u32 vram_refresh_pd;
u32 vram_refresh_cnt;
u32 vram_raslo_max;
u32 vram_raslo_cur;
u32 pwrup_cfg;
u32 vram_xxx[25];
/* Registers for IBM RGB528 Palette */
u32 ramdac_cmap_wridx;
u32 ramdac_palette_data;
u32 ramdac_pixel_mask;
u32 ramdac_palette_rdaddr;
u32 ramdac_idx_lo;
u32 ramdac_idx_hi;
u32 ramdac_idx_data;
u32 ramdac_idx_ctl;
u32 ramdac_xxx[1784];
};
struct p9100_cmd_parameng {
u32 parameng_status;
u32 parameng_bltcmd;
u32 parameng_quadcmd;
};
struct p9100_par {
spinlock_t lock;
struct p9100_regs __iomem *regs;
u32 flags;
#define P9100_FLAG_BLANKED 0x00000001
unsigned long physbase;
unsigned long which_io;
unsigned long fbsize;
};
/**
* p9100_setcolreg - Optional function. Sets a color register.
* @regno: boolean, 0 copy local, 1 get_user() function
* @red: frame buffer colormap structure
* @green: The green value which can be up to 16 bits wide
* @blue: The blue value which can be up to 16 bits wide.
* @transp: If supported the alpha value which can be up to 16 bits wide.
* @info: frame buffer info structure
*/
static int p9100_setcolreg(unsigned regno,
unsigned red, unsigned green, unsigned blue,
unsigned transp, struct fb_info *info)
{
struct p9100_par *par = (struct p9100_par *) info->par;
struct p9100_regs __iomem *regs = par->regs;
unsigned long flags;
if (regno >= 256)
return 1;
red >>= 8;
green >>= 8;
blue >>= 8;
spin_lock_irqsave(&par->lock, flags);
sbus_writel((regno << 16), &regs->ramdac_cmap_wridx);
sbus_writel((red << 16), &regs->ramdac_palette_data);
sbus_writel((green << 16), &regs->ramdac_palette_data);
sbus_writel((blue << 16), &regs->ramdac_palette_data);
spin_unlock_irqrestore(&par->lock, flags);
return 0;
}
/**
* p9100_blank - Optional function. Blanks the display.
* @blank_mode: the blank mode we want.
* @info: frame buffer structure that represents a single frame buffer
*/
static int
p9100_blank(int blank, struct fb_info *info)
{
struct p9100_par *par = (struct p9100_par *) info->par;
struct p9100_regs __iomem *regs = par->regs;
unsigned long flags;
u32 val;
spin_lock_irqsave(&par->lock, flags);
switch (blank) {
case FB_BLANK_UNBLANK: /* Unblanking */
val = sbus_readl(&regs->vid_screenpaint_timectl1);
val |= SCREENPAINT_TIMECTL1_ENABLE_VIDEO;
sbus_writel(val, &regs->vid_screenpaint_timectl1);
par->flags &= ~P9100_FLAG_BLANKED;
break;
case FB_BLANK_NORMAL: /* Normal blanking */
case FB_BLANK_VSYNC_SUSPEND: /* VESA blank (vsync off) */
case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */
case FB_BLANK_POWERDOWN: /* Poweroff */
val = sbus_readl(&regs->vid_screenpaint_timectl1);
val &= ~SCREENPAINT_TIMECTL1_ENABLE_VIDEO;
sbus_writel(val, &regs->vid_screenpaint_timectl1);
par->flags |= P9100_FLAG_BLANKED;
break;
}
spin_unlock_irqrestore(&par->lock, flags);
return 0;
}
static struct sbus_mmap_map p9100_mmap_map[] = {
{ CG3_MMAP_OFFSET, 0, SBUS_MMAP_FBSIZE(1) },
{ 0, 0, 0 }
};
static int p9100_mmap(struct fb_info *info, struct vm_area_struct *vma)
{
struct p9100_par *par = (struct p9100_par *)info->par;
return sbusfb_mmap_helper(p9100_mmap_map,
par->physbase, par->fbsize,
par->which_io, vma);
}
static int p9100_ioctl(struct fb_info *info, unsigned int cmd,
unsigned long arg)
{
struct p9100_par *par = (struct p9100_par *) info->par;
/* Make it look like a cg3. */
return sbusfb_ioctl_helper(cmd, arg, info,
FBTYPE_SUN3COLOR, 8, par->fbsize);
}
/*
* Initialisation
*/
static void p9100_init_fix(struct fb_info *info, int linebytes, struct device_node *dp)
{
strlcpy(info->fix.id, dp->name, sizeof(info->fix.id));
info->fix.type = FB_TYPE_PACKED_PIXELS;
info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
info->fix.line_length = linebytes;
info->fix.accel = FB_ACCEL_SUN_CGTHREE;
}
static int __devinit p9100_probe(struct of_device *op, const struct of_device_id *match)
{
struct device_node *dp = op->node;
struct fb_info *info;
struct p9100_par *par;
int linebytes, err;
info = framebuffer_alloc(sizeof(struct p9100_par), &op->dev);
err = -ENOMEM;
if (!info)
goto out_err;
par = info->par;
spin_lock_init(&par->lock);
/* This is the framebuffer and the only resource apps can mmap. */
par->physbase = op->resource[2].start;
par->which_io = op->resource[2].flags & IORESOURCE_BITS;
sbusfb_fill_var(&info->var, dp->node, 8);
info->var.red.length = 8;
info->var.green.length = 8;
info->var.blue.length = 8;
linebytes = of_getintprop_default(dp, "linebytes", info->var.xres);
par->fbsize = PAGE_ALIGN(linebytes * info->var.yres);
par->regs = of_ioremap(&op->resource[0], 0,
sizeof(struct p9100_regs), "p9100 regs");
if (!par->regs)
goto out_release_fb;
info->flags = FBINFO_DEFAULT;
info->fbops = &p9100_ops;
info->screen_base = of_ioremap(&op->resource[2], 0,
par->fbsize, "p9100 ram");
if (!info->screen_base)
goto out_unmap_regs;
p9100_blank(0, info);
if (fb_alloc_cmap(&info->cmap, 256, 0))
goto out_unmap_screen;
p9100_init_fix(info, linebytes, dp);
err = register_framebuffer(info);
if (err < 0)
goto out_dealloc_cmap;
fb_set_cmap(&info->cmap, info);
dev_set_drvdata(&op->dev, info);
printk("%s: p9100 at %lx:%lx\n",
dp->full_name,
par->which_io, par->physbase);
return 0;
out_dealloc_cmap:
fb_dealloc_cmap(&info->cmap);
out_unmap_screen:
of_iounmap(&op->resource[2], info->screen_base, par->fbsize);
out_unmap_regs:
of_iounmap(&op->resource[0], par->regs, sizeof(struct p9100_regs));
out_release_fb:
framebuffer_release(info);
out_err:
return err;
}
static int __devexit p9100_remove(struct of_device *op)
{
struct fb_info *info = dev_get_drvdata(&op->dev);
struct p9100_par *par = info->par;
unregister_framebuffer(info);
fb_dealloc_cmap(&info->cmap);
of_iounmap(&op->resource[0], par->regs, sizeof(struct p9100_regs));
of_iounmap(&op->resource[2], info->screen_base, par->fbsize);
framebuffer_release(info);
dev_set_drvdata(&op->dev, NULL);
return 0;
}
static struct of_device_id p9100_match[] = {
{
.name = "p9100",
},
{},
};
MODULE_DEVICE_TABLE(of, p9100_match);
static struct of_platform_driver p9100_driver = {
.name = "p9100",
.match_table = p9100_match,
.probe = p9100_probe,
.remove = __devexit_p(p9100_remove),
};
static int __init p9100_init(void)
{
if (fb_get_options("p9100fb", NULL))
return -ENODEV;
return of_register_driver(&p9100_driver, &of_bus_type);
}
static void __exit p9100_exit(void)
{
of_unregister_driver(&p9100_driver);
}
module_init(p9100_init);
module_exit(p9100_exit);
MODULE_DESCRIPTION("framebuffer driver for P9100 chipsets");
MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
MODULE_VERSION("2.0");
MODULE_LICENSE("GPL");
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