[PATCH v4 6/7] video: xilinxfb: Add support for little endian accesses
From: Michal Simek <hidden>
Date: 2013-06-03 10:14:06
Also in:
lkml
Subsystem:
framebuffer layer, the rest · Maintainers:
Helge Deller, Linus Torvalds
Dynamically detect endianess on IP and use ioread/iowrite functions instead of powerpc and microblaze specific out_be32. Signed-off-by: Michal Simek <redacted> Acked-by: Arnd Bergmann <arnd@arndb.de> --- Changes in v4: - Acked by Arnd Changes in v3: - New patch in this patchset based on discussions Changes in v2: None drivers/video/xilinxfb.c | 30 ++++++++++++++++++++++++++++-- 1 file changed, 28 insertions(+), 2 deletions(-)
diff --git a/drivers/video/xilinxfb.c b/drivers/video/xilinxfb.c
index bd3b85d..f3d4a69 100644
--- a/drivers/video/xilinxfb.c
+++ b/drivers/video/xilinxfb.c@@ -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; --
1.8.2.3
Attachments
- (unnamed) [application/pgp-signature] 198 bytes