diff options
Diffstat (limited to 'kernel/arch/arm/mach-imx/clk-pllv1.c')
-rw-r--r-- | kernel/arch/arm/mach-imx/clk-pllv1.c | 126 |
1 files changed, 0 insertions, 126 deletions
diff --git a/kernel/arch/arm/mach-imx/clk-pllv1.c b/kernel/arch/arm/mach-imx/clk-pllv1.c deleted file mode 100644 index d21d14ca4..000000000 --- a/kernel/arch/arm/mach-imx/clk-pllv1.c +++ /dev/null @@ -1,126 +0,0 @@ -#include <linux/clk.h> -#include <linux/clk-provider.h> -#include <linux/io.h> -#include <linux/slab.h> -#include <linux/kernel.h> -#include <linux/err.h> - -#include "clk.h" -#include "common.h" -#include "hardware.h" - -/** - * pll v1 - * - * @clk_hw clock source - * @parent the parent clock name - * @base base address of pll registers - * - * PLL clock version 1, found on i.MX1/21/25/27/31/35 - */ - -#define MFN_BITS (10) -#define MFN_SIGN (BIT(MFN_BITS - 1)) -#define MFN_MASK (MFN_SIGN - 1) - -struct clk_pllv1 { - struct clk_hw hw; - void __iomem *base; -}; - -#define to_clk_pllv1(clk) (container_of(clk, struct clk_pllv1, clk)) - -static inline bool mfn_is_negative(unsigned int mfn) -{ - return !cpu_is_mx1() && !cpu_is_mx21() && (mfn & MFN_SIGN); -} - -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. - * On i.MX27 the bit 9 is the sign bit. - */ - if (mfn_is_negative(mfn)) { - if (cpu_is_mx27()) - mfn_abs = mfn & MFN_MASK; - else - mfn_abs = BIT(MFN_BITS) - mfn; - } - - rate = parent_rate * 2; - rate /= pd + 1; - - ll = (unsigned long long)rate * mfn_abs; - - do_div(ll, mfd + 1); - - if (mfn_is_negative(mfn)) - ll = -ll; - - ll = (rate * mfi) + ll; - - return ll; -} - -static struct clk_ops clk_pllv1_ops = { - .recalc_rate = clk_pllv1_recalc_rate, -}; - -struct clk *imx_clk_pllv1(const char *name, const char *parent, - void __iomem *base) -{ - struct clk_pllv1 *pll; - struct clk *clk; - struct clk_init_data init; - - pll = kmalloc(sizeof(*pll), GFP_KERNEL); - if (!pll) - return ERR_PTR(-ENOMEM); - - pll->base = base; - - init.name = name; - init.ops = &clk_pllv1_ops; - init.flags = 0; - init.parent_names = &parent; - init.num_parents = 1; - - pll->hw.init = &init; - - clk = clk_register(NULL, &pll->hw); - if (IS_ERR(clk)) - kfree(pll); - - return clk; -} |