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authorKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2012-10-19 21:19:19 +0200
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2012-10-19 21:19:19 +0200
commite05dacd71db0a5da7c1a44bcaab2a8a240b9c233 (patch)
tree31382cf1c7d62c03126448affb2fc86e8c4aaa8b /arch/arm/mach-imx/clk-pllv1.c
parentxen: arm: comment on why 64-bit xen_pfn_t is safe even on 32 bit (diff)
parentLinux 3.7-rc1 (diff)
downloadlinux-e05dacd71db0a5da7c1a44bcaab2a8a240b9c233.tar.xz
linux-e05dacd71db0a5da7c1a44bcaab2a8a240b9c233.zip
Merge commit 'v3.7-rc1' into stable/for-linus-3.7
* commit 'v3.7-rc1': (10892 commits) Linux 3.7-rc1 x86, boot: Explicitly include autoconf.h for hostprogs perf: Fix UAPI fallout ARM: config: make sure that platforms are ordered by option string ARM: config: sort select statements alphanumerically UAPI: (Scripted) Disintegrate include/linux/byteorder UAPI: (Scripted) Disintegrate include/linux UAPI: Unexport linux/blk_types.h UAPI: Unexport part of linux/ppp-comp.h perf: Handle new rbtree implementation procfs: don't need a PATH_MAX allocation to hold a string representation of an int vfs: embed struct filename inside of names_cache allocation if possible audit: make audit_inode take struct filename vfs: make path_openat take a struct filename pointer vfs: turn do_path_lookup into wrapper around struct filename variant audit: allow audit code to satisfy getname requests from its names_list vfs: define struct filename and have getname() return it btrfs: Fix compilation with user namespace support enabled userns: Fix posix_acl_file_xattr_userns gid conversion userns: Properly print bluetooth socket uids ...
Diffstat (limited to 'arch/arm/mach-imx/clk-pllv1.c')
-rw-r--r--arch/arm/mach-imx/clk-pllv1.c49
1 files changed, 47 insertions, 2 deletions
diff --git a/arch/arm/mach-imx/clk-pllv1.c b/arch/arm/mach-imx/clk-pllv1.c
index 2d856f9ccf59..02be73178912 100644
--- a/arch/arm/mach-imx/clk-pllv1.c
+++ b/arch/arm/mach-imx/clk-pllv1.c
@@ -6,7 +6,7 @@
#include <linux/err.h>
#include <mach/common.h>
#include <mach/hardware.h>
-#include <mach/clock.h>
+
#include "clk.h"
/**
@@ -29,8 +29,53 @@ static unsigned long clk_pllv1_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct clk_pllv1 *pll = to_clk_pllv1(hw);
+ long long ll;
+ int mfn_abs;
+ unsigned int mfi, mfn, mfd, pd;
+ u32 reg;
+ unsigned long rate;
+
+ reg = readl(pll->base);
+
+ /*
+ * Get the resulting clock rate from a PLL register value and the input
+ * frequency. PLLs with this register layout can be found on i.MX1,
+ * i.MX21, i.MX27 and i,MX31
+ *
+ * mfi + mfn / (mfd + 1)
+ * f = 2 * f_ref * --------------------
+ * pd + 1
+ */
+
+ mfi = (reg >> 10) & 0xf;
+ mfn = reg & 0x3ff;
+ mfd = (reg >> 16) & 0x3ff;
+ pd = (reg >> 26) & 0xf;
+
+ mfi = mfi <= 5 ? 5 : mfi;
+
+ mfn_abs = mfn;
+
+ /*
+ * On all i.MXs except i.MX1 and i.MX21 mfn is a 10bit
+ * 2's complements number
+ */
+ if (!cpu_is_mx1() && !cpu_is_mx21() && mfn >= 0x200)
+ mfn_abs = 0x400 - mfn;
+
+ rate = parent_rate * 2;
+ rate /= pd + 1;
+
+ ll = (unsigned long long)rate * mfn_abs;
+
+ do_div(ll, mfd + 1);
+
+ if (!cpu_is_mx1() && !cpu_is_mx21() && mfn >= 0x200)
+ ll = -ll;
+
+ ll = (rate * mfi) + ll;
- return mxc_decode_pll(readl(pll->base), parent_rate);
+ return ll;
}
struct clk_ops clk_pllv1_ops = {