101 lines
2.4 KiB
C
101 lines
2.4 KiB
C
/*
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* Driver for the ICST307 VCO clock found in the ARM Reference designs.
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* We wrap the custom interface from <asm/hardware/icst.h> into the generic
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* clock framework.
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*
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* TODO: when all ARM reference designs are migrated to generic clocks, the
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* ICST clock code from the ARM tree should probably be merged into this
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* file.
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*/
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#include <linux/clk.h>
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#include <linux/clkdev.h>
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#include <linux/err.h>
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#include <linux/clk-provider.h>
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#include "clk-icst.h"
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/**
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* struct clk_icst - ICST VCO clock wrapper
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* @hw: corresponding clock hardware entry
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* @params: parameters for this ICST instance
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* @rate: current rate
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* @setvco: function to commit ICST settings to hardware
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*/
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struct clk_icst {
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struct clk_hw hw;
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const struct icst_params *params;
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unsigned long rate;
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struct icst_vco (*getvco)(void);
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void (*setvco)(struct icst_vco);
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};
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#define to_icst(_hw) container_of(_hw, struct clk_icst, hw)
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static unsigned long icst_recalc_rate(struct clk_hw *hw,
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unsigned long parent_rate)
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{
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struct clk_icst *icst = to_icst(hw);
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struct icst_vco vco;
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vco = icst->getvco();
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icst->rate = icst_hz(icst->params, vco);
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return icst->rate;
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}
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static long icst_round_rate(struct clk_hw *hw, unsigned long rate,
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unsigned long *prate)
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{
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struct clk_icst *icst = to_icst(hw);
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struct icst_vco vco;
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vco = icst_hz_to_vco(icst->params, rate);
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return icst_hz(icst->params, vco);
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}
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static int icst_set_rate(struct clk_hw *hw, unsigned long rate,
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unsigned long parent_rate)
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{
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struct clk_icst *icst = to_icst(hw);
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struct icst_vco vco;
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vco = icst_hz_to_vco(icst->params, rate);
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icst->rate = icst_hz(icst->params, vco);
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icst->setvco(vco);
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return 0;
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}
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static const struct clk_ops icst_ops = {
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.recalc_rate = icst_recalc_rate,
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.round_rate = icst_round_rate,
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.set_rate = icst_set_rate,
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};
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struct clk * __init icst_clk_register(struct device *dev,
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const struct clk_icst_desc *desc)
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{
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struct clk *clk;
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struct clk_icst *icst;
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struct clk_init_data init;
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icst = kzalloc(sizeof(struct clk_icst), GFP_KERNEL);
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if (!icst) {
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pr_err("could not allocate ICST clock!\n");
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return ERR_PTR(-ENOMEM);
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}
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init.name = "icst";
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init.ops = &icst_ops;
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init.flags = CLK_IS_ROOT;
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init.parent_names = NULL;
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init.num_parents = 0;
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icst->hw.init = &init;
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icst->params = desc->params;
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icst->getvco = desc->getvco;
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icst->setvco = desc->setvco;
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clk = clk_register(dev, &icst->hw);
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if (IS_ERR(clk))
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kfree(icst);
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return clk;
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}
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