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linux-next/drivers/video/bw2.c
Peter Senna Tschudin 0ca30b1b6a drivers/video/bw2.c: fix error return code 
Convert a nonnegative error return code to a negative one, as returned
elsewhere in the function.

A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
(
if@p1 (\(ret < 0\|ret != 0\))
 { ... return ret; }
|
ret@p1 = 0
)
... when != ret = e1
    when != &ret
*if(...)
{
  ... when != ret = e2
      when forall
 return ret;
}
// </smpl>

Signed-off-by: Peter Senna Tschudin <peter.senna@gmail.com>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
2012-09-22 21:41:52 +00:00

410 lines
9.2 KiB
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/* bw2.c: BWTWO frame buffer driver
*
* Copyright (C) 2003, 2006 David S. Miller (davem@davemloft.net)
* Copyright (C) 1996,1998 Jakub Jelinek (jj@ultra.linux.cz)
* Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
* Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be)
*
* 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/delay.h>
#include <linux/init.h>
#include <linux/fb.h>
#include <linux/mm.h>
#include <linux/of_device.h>
#include <asm/io.h>
#include <asm/fbio.h>
#include "sbuslib.h"
/*
* Local functions.
*/
static int bw2_blank(int, struct fb_info *);
static int bw2_mmap(struct fb_info *, struct vm_area_struct *);
static int bw2_ioctl(struct fb_info *, unsigned int, unsigned long);
/*
* Frame buffer operations
*/
static struct fb_ops bw2_ops = {
.owner = THIS_MODULE,
.fb_blank = bw2_blank,
.fb_fillrect = cfb_fillrect,
.fb_copyarea = cfb_copyarea,
.fb_imageblit = cfb_imageblit,
.fb_mmap = bw2_mmap,
.fb_ioctl = bw2_ioctl,
#ifdef CONFIG_COMPAT
.fb_compat_ioctl = sbusfb_compat_ioctl,
#endif
};
/* OBio addresses for the bwtwo registers */
#define BWTWO_REGISTER_OFFSET 0x400000
struct bt_regs {
u32 addr;
u32 color_map;
u32 control;
u32 cursor;
};
struct bw2_regs {
struct bt_regs cmap;
u8 control;
u8 status;
u8 cursor_start;
u8 cursor_end;
u8 h_blank_start;
u8 h_blank_end;
u8 h_sync_start;
u8 h_sync_end;
u8 comp_sync_end;
u8 v_blank_start_high;
u8 v_blank_start_low;
u8 v_blank_end;
u8 v_sync_start;
u8 v_sync_end;
u8 xfer_holdoff_start;
u8 xfer_holdoff_end;
};
/* Status Register Constants */
#define BWTWO_SR_RES_MASK 0x70
#define BWTWO_SR_1600_1280 0x50
#define BWTWO_SR_1152_900_76_A 0x40
#define BWTWO_SR_1152_900_76_B 0x60
#define BWTWO_SR_ID_MASK 0x0f
#define BWTWO_SR_ID_MONO 0x02
#define BWTWO_SR_ID_MONO_ECL 0x03
#define BWTWO_SR_ID_MSYNC 0x04
#define BWTWO_SR_ID_NOCONN 0x0a
/* Control Register Constants */
#define BWTWO_CTL_ENABLE_INTS 0x80
#define BWTWO_CTL_ENABLE_VIDEO 0x40
#define BWTWO_CTL_ENABLE_TIMING 0x20
#define BWTWO_CTL_ENABLE_CURCMP 0x10
#define BWTWO_CTL_XTAL_MASK 0x0C
#define BWTWO_CTL_DIVISOR_MASK 0x03
/* Status Register Constants */
#define BWTWO_STAT_PENDING_INT 0x80
#define BWTWO_STAT_MSENSE_MASK 0x70
#define BWTWO_STAT_ID_MASK 0x0f
struct bw2_par {
spinlock_t lock;
struct bw2_regs __iomem *regs;
u32 flags;
#define BW2_FLAG_BLANKED 0x00000001
unsigned long which_io;
};
/**
* bw2_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
bw2_blank(int blank, struct fb_info *info)
{
struct bw2_par *par = (struct bw2_par *) info->par;
struct bw2_regs __iomem *regs = par->regs;
unsigned long flags;
u8 val;
spin_lock_irqsave(&par->lock, flags);
switch (blank) {
case FB_BLANK_UNBLANK: /* Unblanking */
val = sbus_readb(&regs->control);
val |= BWTWO_CTL_ENABLE_VIDEO;
sbus_writeb(val, &regs->control);
par->flags &= ~BW2_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_readb(&regs->control);
val &= ~BWTWO_CTL_ENABLE_VIDEO;
sbus_writeb(val, &regs->control);
par->flags |= BW2_FLAG_BLANKED;
break;
}
spin_unlock_irqrestore(&par->lock, flags);
return 0;
}
static struct sbus_mmap_map bw2_mmap_map[] = {
{
.size = SBUS_MMAP_FBSIZE(1)
},
{ .size = 0 }
};
static int bw2_mmap(struct fb_info *info, struct vm_area_struct *vma)
{
struct bw2_par *par = (struct bw2_par *)info->par;
return sbusfb_mmap_helper(bw2_mmap_map,
info->fix.smem_start, info->fix.smem_len,
par->which_io,
vma);
}
static int bw2_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg)
{
return sbusfb_ioctl_helper(cmd, arg, info,
FBTYPE_SUN2BW, 1, info->fix.smem_len);
}
/*
* Initialisation
*/
static void __devinit bw2_init_fix(struct fb_info *info, int linebytes)
{
strlcpy(info->fix.id, "bwtwo", sizeof(info->fix.id));
info->fix.type = FB_TYPE_PACKED_PIXELS;
info->fix.visual = FB_VISUAL_MONO01;
info->fix.line_length = linebytes;
info->fix.accel = FB_ACCEL_SUN_BWTWO;
}
static u8 bw2regs_1600[] __devinitdata = {
0x14, 0x8b, 0x15, 0x28, 0x16, 0x03, 0x17, 0x13,
0x18, 0x7b, 0x19, 0x05, 0x1a, 0x34, 0x1b, 0x2e,
0x1c, 0x00, 0x1d, 0x0a, 0x1e, 0xff, 0x1f, 0x01,
0x10, 0x21, 0
};
static u8 bw2regs_ecl[] __devinitdata = {
0x14, 0x65, 0x15, 0x1e, 0x16, 0x04, 0x17, 0x0c,
0x18, 0x5e, 0x19, 0x03, 0x1a, 0xa7, 0x1b, 0x23,
0x1c, 0x00, 0x1d, 0x08, 0x1e, 0xff, 0x1f, 0x01,
0x10, 0x20, 0
};
static u8 bw2regs_analog[] __devinitdata = {
0x14, 0xbb, 0x15, 0x2b, 0x16, 0x03, 0x17, 0x13,
0x18, 0xb0, 0x19, 0x03, 0x1a, 0xa6, 0x1b, 0x22,
0x1c, 0x01, 0x1d, 0x05, 0x1e, 0xff, 0x1f, 0x01,
0x10, 0x20, 0
};
static u8 bw2regs_76hz[] __devinitdata = {
0x14, 0xb7, 0x15, 0x27, 0x16, 0x03, 0x17, 0x0f,
0x18, 0xae, 0x19, 0x03, 0x1a, 0xae, 0x1b, 0x2a,
0x1c, 0x01, 0x1d, 0x09, 0x1e, 0xff, 0x1f, 0x01,
0x10, 0x24, 0
};
static u8 bw2regs_66hz[] __devinitdata = {
0x14, 0xbb, 0x15, 0x2b, 0x16, 0x04, 0x17, 0x14,
0x18, 0xae, 0x19, 0x03, 0x1a, 0xa8, 0x1b, 0x24,
0x1c, 0x01, 0x1d, 0x05, 0x1e, 0xff, 0x1f, 0x01,
0x10, 0x20, 0
};
static int __devinit bw2_do_default_mode(struct bw2_par *par,
struct fb_info *info,
int *linebytes)
{
u8 status, mon;
u8 *p;
status = sbus_readb(&par->regs->status);
mon = status & BWTWO_SR_RES_MASK;
switch (status & BWTWO_SR_ID_MASK) {
case BWTWO_SR_ID_MONO_ECL:
if (mon == BWTWO_SR_1600_1280) {
p = bw2regs_1600;
info->var.xres = info->var.xres_virtual = 1600;
info->var.yres = info->var.yres_virtual = 1280;
*linebytes = 1600 / 8;
} else
p = bw2regs_ecl;
break;
case BWTWO_SR_ID_MONO:
p = bw2regs_analog;
break;
case BWTWO_SR_ID_MSYNC:
if (mon == BWTWO_SR_1152_900_76_A ||
mon == BWTWO_SR_1152_900_76_B)
p = bw2regs_76hz;
else
p = bw2regs_66hz;
break;
case BWTWO_SR_ID_NOCONN:
return 0;
default:
printk(KERN_ERR "bw2: can't handle SR %02x\n",
status);
return -EINVAL;
}
for ( ; *p; p += 2) {
u8 __iomem *regp = &((u8 __iomem *)par->regs)[p[0]];
sbus_writeb(p[1], regp);
}
return 0;
}
static int __devinit bw2_probe(struct platform_device *op)
{
struct device_node *dp = op->dev.of_node;
struct fb_info *info;
struct bw2_par *par;
int linebytes, err;
info = framebuffer_alloc(sizeof(struct bw2_par), &op->dev);
err = -ENOMEM;
if (!info)
goto out_err;
par = info->par;
spin_lock_init(&par->lock);
info->fix.smem_start = op->resource[0].start;
par->which_io = op->resource[0].flags & IORESOURCE_BITS;
sbusfb_fill_var(&info->var, dp, 1);
linebytes = of_getintprop_default(dp, "linebytes",
info->var.xres);
info->var.red.length = info->var.green.length =
info->var.blue.length = info->var.bits_per_pixel;
info->var.red.offset = info->var.green.offset =
info->var.blue.offset = 0;
par->regs = of_ioremap(&op->resource[0], BWTWO_REGISTER_OFFSET,
sizeof(struct bw2_regs), "bw2 regs");
if (!par->regs)
goto out_release_fb;
if (!of_find_property(dp, "width", NULL)) {
err = bw2_do_default_mode(par, info, &linebytes);
if (err)
goto out_unmap_regs;
}
info->fix.smem_len = PAGE_ALIGN(linebytes * info->var.yres);
info->flags = FBINFO_DEFAULT;
info->fbops = &bw2_ops;
info->screen_base = of_ioremap(&op->resource[0], 0,
info->fix.smem_len, "bw2 ram");
if (!info->screen_base) {
err = -ENOMEM;
goto out_unmap_regs;
}
bw2_blank(FB_BLANK_UNBLANK, info);
bw2_init_fix(info, linebytes);
err = register_framebuffer(info);
if (err < 0)
goto out_unmap_screen;
dev_set_drvdata(&op->dev, info);
printk(KERN_INFO "%s: bwtwo at %lx:%lx\n",
dp->full_name, par->which_io, info->fix.smem_start);
return 0;
out_unmap_screen:
of_iounmap(&op->resource[0], info->screen_base, info->fix.smem_len);
out_unmap_regs:
of_iounmap(&op->resource[0], par->regs, sizeof(struct bw2_regs));
out_release_fb:
framebuffer_release(info);
out_err:
return err;
}
static int __devexit bw2_remove(struct platform_device *op)
{
struct fb_info *info = dev_get_drvdata(&op->dev);
struct bw2_par *par = info->par;
unregister_framebuffer(info);
of_iounmap(&op->resource[0], par->regs, sizeof(struct bw2_regs));
of_iounmap(&op->resource[0], info->screen_base, info->fix.smem_len);
framebuffer_release(info);
dev_set_drvdata(&op->dev, NULL);
return 0;
}
static const struct of_device_id bw2_match[] = {
{
.name = "bwtwo",
},
{},
};
MODULE_DEVICE_TABLE(of, bw2_match);
static struct platform_driver bw2_driver = {
.driver = {
.name = "bw2",
.owner = THIS_MODULE,
.of_match_table = bw2_match,
},
.probe = bw2_probe,
.remove = __devexit_p(bw2_remove),
};
static int __init bw2_init(void)
{
if (fb_get_options("bw2fb", NULL))
return -ENODEV;
return platform_driver_register(&bw2_driver);
}
static void __exit bw2_exit(void)
{
platform_driver_unregister(&bw2_driver);
}
module_init(bw2_init);
module_exit(bw2_exit);
MODULE_DESCRIPTION("framebuffer driver for BWTWO chipsets");
MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
MODULE_VERSION("2.0");
MODULE_LICENSE("GPL");
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