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video: xilinxfb: Add support for little endian accesses 

Dynamically detect endianess on IP and use
ioread/iowrite functions instead of powerpc and microblaze
specific out_be32.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
This commit is contained in:
Michal Simek 2013-06-03 12:13:21 +02:00 committed by Tomi Valkeinen
parent a8f045aa07
commit 2121c339eb
1 changed files with 28 additions and 2 deletions
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30
drivers/video/xilinxfb.c
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@ -117,6 +117,7 @@ static struct fb_var_screeninfo xilinx_fb_var = {
#define BUS_ACCESS_FLAG 0x1 /* 1 = BUS, 0 = DCR */
#define LITTLE_ENDIAN_ACCESS 0x2 /* LITTLE ENDIAN IO functions */
struct xilinxfb_drvdata {
@ -153,14 +154,33 @@ struct xilinxfb_drvdata {
static void xilinx_fb_out32(struct xilinxfb_drvdata *drvdata, u32 offset,
u32 val)
{
if (drvdata->flags & BUS_ACCESS_FLAG)
out_be32(drvdata->regs + (offset << 2), val);
if (drvdata->flags & BUS_ACCESS_FLAG) {
if (drvdata->flags & LITTLE_ENDIAN_ACCESS)
iowrite32(val, drvdata->regs + (offset << 2));
else
iowrite32be(val, drvdata->regs + (offset << 2));
}
#ifdef CONFIG_PPC_DCR
else
dcr_write(drvdata->dcr_host, offset, val);
#endif
}
static u32 xilinx_fb_in32(struct xilinxfb_drvdata *drvdata, u32 offset)
{
if (drvdata->flags & BUS_ACCESS_FLAG) {
if (drvdata->flags & LITTLE_ENDIAN_ACCESS)
return ioread32(drvdata->regs + (offset << 2));
else
return ioread32be(drvdata->regs + (offset << 2));
}
#ifdef CONFIG_PPC_DCR
else
return dcr_read(drvdata->dcr_host, offset);
#endif
return 0;
}
static int
xilinx_fb_setcolreg(unsigned regno, unsigned red, unsigned green, unsigned blue,
unsigned transp, struct fb_info *fbi)
@ -271,6 +291,12 @@ static int xilinxfb_assign(struct platform_device *pdev,
/* Tell the hardware where the frame buffer is */
xilinx_fb_out32(drvdata, REG_FB_ADDR, drvdata->fb_phys);
rc = xilinx_fb_in32(drvdata, REG_FB_ADDR);
/* Endianess detection */
if (rc != drvdata->fb_phys) {
drvdata->flags |= LITTLE_ENDIAN_ACCESS;
xilinx_fb_out32(drvdata, REG_FB_ADDR, drvdata->fb_phys);
}
/* Turn on the display */
drvdata->reg_ctrl_default = REG_CTRL_ENABLE;