Merge branch 'for-rmk' of git://git.pengutronix.de/git/ukl/linux-2.6 into devel
[pandora-kernel.git] / arch / arm / plat-s3c24xx / include / plat / pll.h
1 /* linux/arch/arm/plat-s3c24xx/include/plat/pll.h
2  *
3  * Copyright 2008 Simtec Electronics
4  *      Ben Dooks <ben@simtec.co.uk>
5  *      http://armlinux.simtec.co.uk/
6  *
7  * S3C24xx - common pll registers and code
8  */
9
10 #define S3C24XX_PLLCON_MDIVSHIFT        12
11 #define S3C24XX_PLLCON_PDIVSHIFT        4
12 #define S3C24XX_PLLCON_SDIVSHIFT        0
13 #define S3C24XX_PLLCON_MDIVMASK         ((1<<(1+(19-12)))-1)
14 #define S3C24XX_PLLCON_PDIVMASK         ((1<<5)-1)
15 #define S3C24XX_PLLCON_SDIVMASK         3
16
17 #include <asm/div64.h>
18
19 static inline unsigned int
20 s3c24xx_get_pll(unsigned int pllval, unsigned int baseclk)
21 {
22         unsigned int mdiv, pdiv, sdiv;
23         uint64_t fvco;
24
25         mdiv = pllval >> S3C24XX_PLLCON_MDIVSHIFT;
26         pdiv = pllval >> S3C24XX_PLLCON_PDIVSHIFT;
27         sdiv = pllval >> S3C24XX_PLLCON_SDIVSHIFT;
28
29         mdiv &= S3C24XX_PLLCON_MDIVMASK;
30         pdiv &= S3C24XX_PLLCON_PDIVMASK;
31         sdiv &= S3C24XX_PLLCON_SDIVMASK;
32
33         fvco = (uint64_t)baseclk * (mdiv + 8);
34         do_div(fvco, (pdiv + 2) << sdiv);
35
36         return (unsigned int)fvco;
37 }