| /* |
| * Driver for the ICST307 VCO clock found in the ARM Reference designs. |
| * We wrap the custom interface from <asm/hardware/icst.h> into the generic |
| * clock framework. |
| * |
| * Copyright (C) 2012 Linus Walleij |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| * |
| * TODO: when all ARM reference designs are migrated to generic clocks, the |
| * ICST clock code from the ARM tree should probably be merged into this |
| * file. |
| */ |
| #include <linux/clk.h> |
| #include <linux/clkdev.h> |
| #include <linux/err.h> |
| #include <linux/clk-provider.h> |
| |
| #include "clk-icst.h" |
| |
| /** |
| * struct clk_icst - ICST VCO clock wrapper |
| * @hw: corresponding clock hardware entry |
| * @params: parameters for this ICST instance |
| * @rate: current rate |
| * @setvco: function to commit ICST settings to hardware |
| */ |
| struct clk_icst { |
| struct clk_hw hw; |
| const struct icst_params *params; |
| unsigned long rate; |
| struct icst_vco (*getvco)(void); |
| void (*setvco)(struct icst_vco); |
| }; |
| |
| #define to_icst(_hw) container_of(_hw, struct clk_icst, hw) |
| |
| static unsigned long icst_recalc_rate(struct clk_hw *hw, |
| unsigned long parent_rate) |
| { |
| struct clk_icst *icst = to_icst(hw); |
| struct icst_vco vco; |
| |
| vco = icst->getvco(); |
| icst->rate = icst_hz(icst->params, vco); |
| return icst->rate; |
| } |
| |
| static long icst_round_rate(struct clk_hw *hw, unsigned long rate, |
| unsigned long *prate) |
| { |
| struct clk_icst *icst = to_icst(hw); |
| struct icst_vco vco; |
| |
| vco = icst_hz_to_vco(icst->params, rate); |
| return icst_hz(icst->params, vco); |
| } |
| |
| static int icst_set_rate(struct clk_hw *hw, unsigned long rate, |
| unsigned long parent_rate) |
| { |
| struct clk_icst *icst = to_icst(hw); |
| struct icst_vco vco; |
| |
| vco = icst_hz_to_vco(icst->params, rate); |
| icst->rate = icst_hz(icst->params, vco); |
| icst->setvco(vco); |
| return 0; |
| } |
| |
| static const struct clk_ops icst_ops = { |
| .recalc_rate = icst_recalc_rate, |
| .round_rate = icst_round_rate, |
| .set_rate = icst_set_rate, |
| }; |
| |
| struct clk * __init icst_clk_register(struct device *dev, |
| const struct clk_icst_desc *desc) |
| { |
| struct clk *clk; |
| struct clk_icst *icst; |
| struct clk_init_data init; |
| |
| icst = kzalloc(sizeof(struct clk_icst), GFP_KERNEL); |
| if (!icst) { |
| pr_err("could not allocate ICST clock!\n"); |
| return ERR_PTR(-ENOMEM); |
| } |
| init.name = "icst"; |
| init.ops = &icst_ops; |
| init.flags = CLK_IS_ROOT; |
| init.parent_names = NULL; |
| init.num_parents = 0; |
| icst->hw.init = &init; |
| icst->params = desc->params; |
| icst->getvco = desc->getvco; |
| icst->setvco = desc->setvco; |
| |
| clk = clk_register(dev, &icst->hw); |
| if (IS_ERR(clk)) |
| kfree(icst); |
| |
| return clk; |
| } |