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137 lines
3.1 KiB
137 lines
3.1 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (C) 2013 Boris BREZILLON <[email protected]> |
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*/ |
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#include <linux/clk-provider.h> |
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#include <linux/clkdev.h> |
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#include <linux/clk/at91_pmc.h> |
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#include <linux/of.h> |
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#include <linux/mfd/syscon.h> |
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#include <linux/regmap.h> |
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#include "pmc.h" |
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#define SMD_DIV_SHIFT 8 |
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#define SMD_MAX_DIV 0xf |
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struct at91sam9x5_clk_smd { |
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struct clk_hw hw; |
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struct regmap *regmap; |
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}; |
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#define to_at91sam9x5_clk_smd(hw) \ |
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container_of(hw, struct at91sam9x5_clk_smd, hw) |
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static unsigned long at91sam9x5_clk_smd_recalc_rate(struct clk_hw *hw, |
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unsigned long parent_rate) |
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{ |
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struct at91sam9x5_clk_smd *smd = to_at91sam9x5_clk_smd(hw); |
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unsigned int smdr; |
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u8 smddiv; |
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regmap_read(smd->regmap, AT91_PMC_SMD, &smdr); |
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smddiv = (smdr & AT91_PMC_SMD_DIV) >> SMD_DIV_SHIFT; |
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return parent_rate / (smddiv + 1); |
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} |
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static long at91sam9x5_clk_smd_round_rate(struct clk_hw *hw, unsigned long rate, |
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unsigned long *parent_rate) |
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{ |
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unsigned long div; |
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unsigned long bestrate; |
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unsigned long tmp; |
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if (rate >= *parent_rate) |
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return *parent_rate; |
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div = *parent_rate / rate; |
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if (div > SMD_MAX_DIV) |
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return *parent_rate / (SMD_MAX_DIV + 1); |
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bestrate = *parent_rate / div; |
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tmp = *parent_rate / (div + 1); |
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if (bestrate - rate > rate - tmp) |
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bestrate = tmp; |
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return bestrate; |
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} |
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static int at91sam9x5_clk_smd_set_parent(struct clk_hw *hw, u8 index) |
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{ |
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struct at91sam9x5_clk_smd *smd = to_at91sam9x5_clk_smd(hw); |
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if (index > 1) |
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return -EINVAL; |
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regmap_update_bits(smd->regmap, AT91_PMC_SMD, AT91_PMC_SMDS, |
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index ? AT91_PMC_SMDS : 0); |
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return 0; |
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} |
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static u8 at91sam9x5_clk_smd_get_parent(struct clk_hw *hw) |
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{ |
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struct at91sam9x5_clk_smd *smd = to_at91sam9x5_clk_smd(hw); |
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unsigned int smdr; |
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regmap_read(smd->regmap, AT91_PMC_SMD, &smdr); |
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return smdr & AT91_PMC_SMDS; |
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} |
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static int at91sam9x5_clk_smd_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 at91sam9x5_clk_smd *smd = to_at91sam9x5_clk_smd(hw); |
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unsigned long div = parent_rate / rate; |
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if (parent_rate % rate || div < 1 || div > (SMD_MAX_DIV + 1)) |
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return -EINVAL; |
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regmap_update_bits(smd->regmap, AT91_PMC_SMD, AT91_PMC_SMD_DIV, |
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(div - 1) << SMD_DIV_SHIFT); |
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return 0; |
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} |
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static const struct clk_ops at91sam9x5_smd_ops = { |
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.recalc_rate = at91sam9x5_clk_smd_recalc_rate, |
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.round_rate = at91sam9x5_clk_smd_round_rate, |
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.get_parent = at91sam9x5_clk_smd_get_parent, |
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.set_parent = at91sam9x5_clk_smd_set_parent, |
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.set_rate = at91sam9x5_clk_smd_set_rate, |
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}; |
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struct clk_hw * __init |
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at91sam9x5_clk_register_smd(struct regmap *regmap, const char *name, |
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const char **parent_names, u8 num_parents) |
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{ |
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struct at91sam9x5_clk_smd *smd; |
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struct clk_hw *hw; |
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struct clk_init_data init; |
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int ret; |
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smd = kzalloc(sizeof(*smd), GFP_KERNEL); |
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if (!smd) |
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return ERR_PTR(-ENOMEM); |
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init.name = name; |
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init.ops = &at91sam9x5_smd_ops; |
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init.parent_names = parent_names; |
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init.num_parents = num_parents; |
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init.flags = CLK_SET_RATE_GATE | CLK_SET_PARENT_GATE; |
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smd->hw.init = &init; |
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smd->regmap = regmap; |
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hw = &smd->hw; |
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ret = clk_hw_register(NULL, &smd->hw); |
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if (ret) { |
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kfree(smd); |
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hw = ERR_PTR(ret); |
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} |
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return hw; |
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}
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