This adds the basic i.MX common clk support and some pll and pfd drivers. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
95 lines
2 KiB
C
95 lines
2 KiB
C
/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <common.h>
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#include <init.h>
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#include <driver.h>
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#include <linux/clk.h>
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#include <io.h>
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#include <linux/clkdev.h>
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#include <linux/err.h>
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#include <malloc.h>
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#include <asm-generic/div64.h>
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#include "clk.h"
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struct clk_pllv1 {
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struct clk clk;
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void __iomem *reg;
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const char *parent;
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};
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static unsigned long clk_pllv1_recalc_rate(struct clk *clk,
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unsigned long parent_rate)
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{
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struct clk_pllv1 *pll = container_of(clk, struct clk_pllv1, clk);
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unsigned long long ll;
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int mfn_abs;
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unsigned int mfi, mfn, mfd, pd;
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u32 reg_val = readl(pll->reg);
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unsigned long freq = parent_rate;
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mfi = (reg_val >> 10) & 0xf;
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mfn = reg_val & 0x3ff;
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mfd = (reg_val >> 16) & 0x3ff;
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pd = (reg_val >> 26) & 0xf;
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mfi = mfi <= 5 ? 5 : mfi;
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mfn_abs = mfn;
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#if !defined CONFIG_ARCH_MX1 && !defined CONFIG_ARCH_MX21
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if (mfn >= 0x200) {
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mfn |= 0xFFFFFE00;
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mfn_abs = -mfn;
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}
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#endif
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freq *= 2;
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freq /= pd + 1;
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ll = (unsigned long long)freq * mfn_abs;
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do_div(ll, mfd + 1);
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if (mfn < 0)
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ll = -ll;
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ll = (freq * mfi) + ll;
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return ll;
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}
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struct clk_ops clk_pllv1_ops = {
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.recalc_rate = clk_pllv1_recalc_rate,
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};
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struct clk *imx_clk_pllv1(const char *name, const char *parent,
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void __iomem *base)
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{
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struct clk_pllv1 *pll = xzalloc(sizeof(*pll));
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int ret;
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pll->parent = parent;
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pll->reg = base;
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pll->clk.ops = &clk_pllv1_ops;
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pll->clk.name = name;
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pll->clk.parent_names = &pll->parent;
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pll->clk.num_parents = 1;
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ret = clk_register(&pll->clk);
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if (ret) {
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free(pll);
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return ERR_PTR(ret);
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}
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return &pll->clk;
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}
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