OpenE2K/linux
6
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity
e39ae85644
linux/drivers/video/cg3.c
Peter Senna Tschudin c24249f574 drivers/video/cg3.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 21:41:51 +00:00

495 lines
11 KiB
C
Raw Blame History

/* cg3.c: CGTHREE 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 cg3_setcolreg(unsigned, unsigned, unsigned, unsigned,
unsigned, struct fb_info *);
static int cg3_blank(int, struct fb_info *);
static int cg3_mmap(struct fb_info *, struct vm_area_struct *);
static int cg3_ioctl(struct fb_info *, unsigned int, unsigned long);
/*
* Frame buffer operations
*/
static struct fb_ops cg3_ops = {
.owner = THIS_MODULE,
.fb_setcolreg = cg3_setcolreg,
.fb_blank = cg3_blank,
.fb_fillrect = cfb_fillrect,
.fb_copyarea = cfb_copyarea,
.fb_imageblit = cfb_imageblit,
.fb_mmap = cg3_mmap,
.fb_ioctl = cg3_ioctl,
#ifdef CONFIG_COMPAT
.fb_compat_ioctl = sbusfb_compat_ioctl,
#endif
};
/* Control Register Constants */
#define CG3_CR_ENABLE_INTS 0x80
#define CG3_CR_ENABLE_VIDEO 0x40
#define CG3_CR_ENABLE_TIMING 0x20
#define CG3_CR_ENABLE_CURCMP 0x10
#define CG3_CR_XTAL_MASK 0x0c
#define CG3_CR_DIVISOR_MASK 0x03
/* Status Register Constants */
#define CG3_SR_PENDING_INT 0x80
#define CG3_SR_RES_MASK 0x70
#define CG3_SR_1152_900_76_A 0x40
#define CG3_SR_1152_900_76_B 0x60
#define CG3_SR_ID_MASK 0x0f
#define CG3_SR_ID_COLOR 0x01
#define CG3_SR_ID_MONO 0x02
#define CG3_SR_ID_MONO_ECL 0x03
enum cg3_type {
CG3_AT_66HZ = 0,
CG3_AT_76HZ,
CG3_RDI
};
struct bt_regs {
u32 addr;
u32 color_map;
u32 control;
u32 cursor;
};
struct cg3_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;
};
/* Offset of interesting structures in the OBIO space */
#define CG3_REGS_OFFSET 0x400000UL
#define CG3_RAM_OFFSET 0x800000UL
struct cg3_par {
spinlock_t lock;
struct cg3_regs __iomem *regs;
u32 sw_cmap[((256 * 3) + 3) / 4];
u32 flags;
#define CG3_FLAG_BLANKED 0x00000001
#define CG3_FLAG_RDI 0x00000002
unsigned long which_io;
};
/**
* cg3_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
*
* The cg3 palette is loaded with 4 color values at each time
* so you end up with: (rgb)(r), (gb)(rg), (b)(rgb), and so on.
* We keep a sw copy of the hw cmap to assist us in this esoteric
* loading procedure.
*/
static int cg3_setcolreg(unsigned regno,
unsigned red, unsigned green, unsigned blue,
unsigned transp, struct fb_info *info)
{
struct cg3_par *par = (struct cg3_par *) info->par;
struct bt_regs __iomem *bt = &par->regs->cmap;
unsigned long flags;
u32 *p32;
u8 *p8;
int count;
if (regno >= 256)
return 1;
red >>= 8;
green >>= 8;
blue >>= 8;
spin_lock_irqsave(&par->lock, flags);
p8 = (u8 *)par->sw_cmap + (regno * 3);
p8[0] = red;
p8[1] = green;
p8[2] = blue;
#define D4M3(x) ((((x)>>2)<<1) + ((x)>>2)) /* (x/4)*3 */
#define D4M4(x) ((x)&~0x3) /* (x/4)*4 */
count = 3;
p32 = &par->sw_cmap[D4M3(regno)];
sbus_writel(D4M4(regno), &bt->addr);
while (count--)
sbus_writel(*p32++, &bt->color_map);
#undef D4M3
#undef D4M4
spin_unlock_irqrestore(&par->lock, flags);
return 0;
}
/**
* cg3_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 cg3_blank(int blank, struct fb_info *info)
{
struct cg3_par *par = (struct cg3_par *) info->par;
struct cg3_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 |= CG3_CR_ENABLE_VIDEO;
sbus_writeb(val, &regs->control);
par->flags &= ~CG3_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 &= ~CG3_CR_ENABLE_VIDEO;
sbus_writeb(val, &regs->control);
par->flags |= CG3_FLAG_BLANKED;
break;
}
spin_unlock_irqrestore(&par->lock, flags);
return 0;
}
static struct sbus_mmap_map cg3_mmap_map[] = {
{
.voff = CG3_MMAP_OFFSET,
.poff = CG3_RAM_OFFSET,
.size = SBUS_MMAP_FBSIZE(1)
},
{ .size = 0 }
};
static int cg3_mmap(struct fb_info *info, struct vm_area_struct *vma)
{
struct cg3_par *par = (struct cg3_par *)info->par;
return sbusfb_mmap_helper(cg3_mmap_map,
info->fix.smem_start, info->fix.smem_len,
par->which_io,
vma);
}
static int cg3_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg)
{
return sbusfb_ioctl_helper(cmd, arg, info,
FBTYPE_SUN3COLOR, 8, info->fix.smem_len);
}
/*
* Initialisation
*/
static void __devinit cg3_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 void __devinit cg3_rdi_maybe_fixup_var(struct fb_var_screeninfo *var,
struct device_node *dp)
{
const char *params;
char *p;
int ww, hh;
params = of_get_property(dp, "params", NULL);
if (params) {
ww = simple_strtoul(params, &p, 10);
if (ww && *p == 'x') {
hh = simple_strtoul(p + 1, &p, 10);
if (hh && *p == '-') {
if (var->xres != ww ||
var->yres != hh) {
var->xres = var->xres_virtual = ww;
var->yres = var->yres_virtual = hh;
}
}
}
}
}
static u8 cg3regvals_66hz[] __devinitdata = { /* 1152 x 900, 66 Hz */
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 u8 cg3regvals_76hz[] __devinitdata = { /* 1152 x 900, 76 Hz */
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 cg3regvals_rdi[] __devinitdata = { /* 640 x 480, cgRDI */
0x14, 0x70, 0x15, 0x20, 0x16, 0x08, 0x17, 0x10,
0x18, 0x06, 0x19, 0x02, 0x1a, 0x31, 0x1b, 0x51,
0x1c, 0x06, 0x1d, 0x0c, 0x1e, 0xff, 0x1f, 0x01,
0x10, 0x22, 0
};
static u8 *cg3_regvals[] __devinitdata = {
cg3regvals_66hz, cg3regvals_76hz, cg3regvals_rdi
};
static u_char cg3_dacvals[] __devinitdata = {
4, 0xff, 5, 0x00, 6, 0x70, 7, 0x00, 0
};
static int __devinit cg3_do_default_mode(struct cg3_par *par)
{
enum cg3_type type;
u8 *p;
if (par->flags & CG3_FLAG_RDI)
type = CG3_RDI;
else {
u8 status = sbus_readb(&par->regs->status), mon;
if ((status & CG3_SR_ID_MASK) == CG3_SR_ID_COLOR) {
mon = status & CG3_SR_RES_MASK;
if (mon == CG3_SR_1152_900_76_A ||
mon == CG3_SR_1152_900_76_B)
type = CG3_AT_76HZ;
else
type = CG3_AT_66HZ;
} else {
printk(KERN_ERR "cgthree: can't handle SR %02x\n",
status);
return -EINVAL;
}
}
for (p = cg3_regvals[type]; *p; p += 2) {
u8 __iomem *regp = &((u8 __iomem *)par->regs)[p[0]];
sbus_writeb(p[1], regp);
}
for (p = cg3_dacvals; *p; p += 2) {
u8 __iomem *regp;
regp = (u8 __iomem *)&par->regs->cmap.addr;
sbus_writeb(p[0], regp);
regp = (u8 __iomem *)&par->regs->cmap.control;
sbus_writeb(p[1], regp);
}
return 0;
}
static int __devinit cg3_probe(struct platform_device *op)
{
struct device_node *dp = op->dev.of_node;
struct fb_info *info;
struct cg3_par *par;
int linebytes, err;
info = framebuffer_alloc(sizeof(struct cg3_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, 8);
info->var.red.length = 8;
info->var.green.length = 8;
info->var.blue.length = 8;
if (!strcmp(dp->name, "cgRDI"))
par->flags |= CG3_FLAG_RDI;
if (par->flags & CG3_FLAG_RDI)
cg3_rdi_maybe_fixup_var(&info->var, dp);
linebytes = of_getintprop_default(dp, "linebytes",
info->var.xres);
info->fix.smem_len = PAGE_ALIGN(linebytes * info->var.yres);
par->regs = of_ioremap(&op->resource[0], CG3_REGS_OFFSET,
sizeof(struct cg3_regs), "cg3 regs");
if (!par->regs)
goto out_release_fb;
info->flags = FBINFO_DEFAULT;
info->fbops = &cg3_ops;
info->screen_base = of_ioremap(&op->resource[0], CG3_RAM_OFFSET,
info->fix.smem_len, "cg3 ram");
if (!info->screen_base)
goto out_unmap_regs;
cg3_blank(FB_BLANK_UNBLANK, info);
if (!of_find_property(dp, "width", NULL)) {
err = cg3_do_default_mode(par);
if (err)
goto out_unmap_screen;
}
err = fb_alloc_cmap(&info->cmap, 256, 0);
if (err)
goto out_unmap_screen;
fb_set_cmap(&info->cmap, info);
cg3_init_fix(info, linebytes, dp);
err = register_framebuffer(info);
if (err < 0)
goto out_dealloc_cmap;
dev_set_drvdata(&op->dev, info);
printk(KERN_INFO "%s: cg3 at %lx:%lx\n",
dp->full_name, par->which_io, info->fix.smem_start);
return 0;
out_dealloc_cmap:
fb_dealloc_cmap(&info->cmap);
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 cg3_regs));
out_release_fb:
framebuffer_release(info);
out_err:
return err;
}
static int __devexit cg3_remove(struct platform_device *op)
{
struct fb_info *info = dev_get_drvdata(&op->dev);
struct cg3_par *par = info->par;
unregister_framebuffer(info);
fb_dealloc_cmap(&info->cmap);
of_iounmap(&op->resource[0], par->regs, sizeof(struct cg3_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 cg3_match[] = {
{
.name = "cgthree",
},
{
.name = "cgRDI",
},
{},
};
MODULE_DEVICE_TABLE(of, cg3_match);
static struct platform_driver cg3_driver = {
.driver = {
.name = "cg3",
.owner = THIS_MODULE,
.of_match_table = cg3_match,
},
.probe = cg3_probe,
.remove = __devexit_p(cg3_remove),
};
static int __init cg3_init(void)
{
if (fb_get_options("cg3fb", NULL))
return -ENODEV;
return platform_driver_register(&cg3_driver);
}
static void __exit cg3_exit(void)
{
platform_driver_unregister(&cg3_driver);
}
module_init(cg3_init);
module_exit(cg3_exit);
MODULE_DESCRIPTION("framebuffer driver for CGthree chipsets");
MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
MODULE_VERSION("2.0");
MODULE_LICENSE("GPL");
Reference in New Issue View Git Blame Copy Permalink