clk: qcom: Add support for root clock generators (RCGs)
Add support for the root clock generators on Qualcomm devices. RCGs are highly customizable mux/divider/counter clocks that can be used to generate almost any rate desired given some input source that is faster than the desired rate. Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: Mike Turquette <mturquette@linaro.org>hifive-unleashed-5.1
Stephen Boyd
Mike Turquette
parent
9e2631313c
commit
bcd61c0f53
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@ -2,3 +2,5 @@ obj-$(CONFIG_COMMON_CLK_QCOM) += clk-qcom.o
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clk-qcom-$(CONFIG_COMMON_CLK_QCOM) += clk-regmap.o
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clk-qcom-$(CONFIG_COMMON_CLK_QCOM) += clk-pll.o
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clk-qcom-$(CONFIG_COMMON_CLK_QCOM) += clk-rcg.o
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clk-qcom-$(CONFIG_COMMON_CLK_QCOM) += clk-rcg2.o
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@ -0,0 +1,517 @@
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/*
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* Copyright (c) 2013, The Linux Foundation. All rights reserved.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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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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#include <linux/kernel.h>
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#include <linux/bitops.h>
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#include <linux/err.h>
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#include <linux/export.h>
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#include <linux/clk-provider.h>
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#include <linux/regmap.h>
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#include <asm/div64.h>
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#include "clk-rcg.h"
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static u32 ns_to_src(struct src_sel *s, u32 ns)
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{
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ns >>= s->src_sel_shift;
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ns &= SRC_SEL_MASK;
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return ns;
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}
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static u32 src_to_ns(struct src_sel *s, u8 src, u32 ns)
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{
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u32 mask;
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mask = SRC_SEL_MASK;
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mask <<= s->src_sel_shift;
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ns &= ~mask;
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ns |= src << s->src_sel_shift;
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return ns;
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}
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static u8 clk_rcg_get_parent(struct clk_hw *hw)
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{
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struct clk_rcg *rcg = to_clk_rcg(hw);
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int num_parents = __clk_get_num_parents(hw->clk);
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u32 ns;
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int i;
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regmap_read(rcg->clkr.regmap, rcg->ns_reg, &ns);
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ns = ns_to_src(&rcg->s, ns);
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for (i = 0; i < num_parents; i++)
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if (ns == rcg->s.parent_map[i])
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return i;
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return -EINVAL;
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}
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static int reg_to_bank(struct clk_dyn_rcg *rcg, u32 bank)
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{
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bank &= BIT(rcg->mux_sel_bit);
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return !!bank;
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}
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static u8 clk_dyn_rcg_get_parent(struct clk_hw *hw)
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{
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struct clk_dyn_rcg *rcg = to_clk_dyn_rcg(hw);
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int num_parents = __clk_get_num_parents(hw->clk);
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u32 ns, ctl;
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int bank;
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int i;
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struct src_sel *s;
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regmap_read(rcg->clkr.regmap, rcg->clkr.enable_reg, &ctl);
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bank = reg_to_bank(rcg, ctl);
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s = &rcg->s[bank];
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regmap_read(rcg->clkr.regmap, rcg->ns_reg, &ns);
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ns = ns_to_src(s, ns);
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for (i = 0; i < num_parents; i++)
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if (ns == s->parent_map[i])
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return i;
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return -EINVAL;
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}
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static int clk_rcg_set_parent(struct clk_hw *hw, u8 index)
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{
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struct clk_rcg *rcg = to_clk_rcg(hw);
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u32 ns;
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regmap_read(rcg->clkr.regmap, rcg->ns_reg, &ns);
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ns = src_to_ns(&rcg->s, rcg->s.parent_map[index], ns);
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regmap_write(rcg->clkr.regmap, rcg->ns_reg, ns);
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return 0;
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}
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static u32 md_to_m(struct mn *mn, u32 md)
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{
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md >>= mn->m_val_shift;
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md &= BIT(mn->width) - 1;
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return md;
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}
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static u32 ns_to_pre_div(struct pre_div *p, u32 ns)
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{
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ns >>= p->pre_div_shift;
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ns &= BIT(p->pre_div_width) - 1;
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return ns;
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}
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static u32 pre_div_to_ns(struct pre_div *p, u8 pre_div, u32 ns)
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{
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u32 mask;
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mask = BIT(p->pre_div_width) - 1;
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mask <<= p->pre_div_shift;
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ns &= ~mask;
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ns |= pre_div << p->pre_div_shift;
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return ns;
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}
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static u32 mn_to_md(struct mn *mn, u32 m, u32 n, u32 md)
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{
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u32 mask, mask_w;
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mask_w = BIT(mn->width) - 1;
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mask = (mask_w << mn->m_val_shift) | mask_w;
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md &= ~mask;
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if (n) {
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m <<= mn->m_val_shift;
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md |= m;
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md |= ~n & mask_w;
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}
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return md;
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}
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static u32 ns_m_to_n(struct mn *mn, u32 ns, u32 m)
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{
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ns = ~ns >> mn->n_val_shift;
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ns &= BIT(mn->width) - 1;
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return ns + m;
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}
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static u32 reg_to_mnctr_mode(struct mn *mn, u32 val)
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{
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val >>= mn->mnctr_mode_shift;
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val &= MNCTR_MODE_MASK;
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return val;
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}
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static u32 mn_to_ns(struct mn *mn, u32 m, u32 n, u32 ns)
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{
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u32 mask;
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mask = BIT(mn->width) - 1;
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mask <<= mn->n_val_shift;
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ns &= ~mask;
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if (n) {
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n = n - m;
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n = ~n;
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n &= BIT(mn->width) - 1;
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n <<= mn->n_val_shift;
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ns |= n;
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}
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return ns;
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}
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static u32 mn_to_reg(struct mn *mn, u32 m, u32 n, u32 val)
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{
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u32 mask;
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mask = MNCTR_MODE_MASK << mn->mnctr_mode_shift;
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mask |= BIT(mn->mnctr_en_bit);
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val &= ~mask;
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if (n) {
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val |= BIT(mn->mnctr_en_bit);
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val |= MNCTR_MODE_DUAL << mn->mnctr_mode_shift;
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}
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return val;
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}
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static void configure_bank(struct clk_dyn_rcg *rcg, const struct freq_tbl *f)
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{
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u32 ns, md, ctl, *regp;
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int bank, new_bank;
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struct mn *mn;
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struct pre_div *p;
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struct src_sel *s;
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bool enabled;
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u32 md_reg;
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u32 bank_reg;
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bool banked_mn = !!rcg->mn[1].width;
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struct clk_hw *hw = &rcg->clkr.hw;
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enabled = __clk_is_enabled(hw->clk);
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regmap_read(rcg->clkr.regmap, rcg->ns_reg, &ns);
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regmap_read(rcg->clkr.regmap, rcg->clkr.enable_reg, &ctl);
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if (banked_mn) {
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regp = &ctl;
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bank_reg = rcg->clkr.enable_reg;
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} else {
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regp = &ns;
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bank_reg = rcg->ns_reg;
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}
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bank = reg_to_bank(rcg, *regp);
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new_bank = enabled ? !bank : bank;
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if (banked_mn) {
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mn = &rcg->mn[new_bank];
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md_reg = rcg->md_reg[new_bank];
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ns |= BIT(mn->mnctr_reset_bit);
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regmap_write(rcg->clkr.regmap, rcg->ns_reg, ns);
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regmap_read(rcg->clkr.regmap, md_reg, &md);
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md = mn_to_md(mn, f->m, f->n, md);
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regmap_write(rcg->clkr.regmap, md_reg, md);
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ns = mn_to_ns(mn, f->m, f->n, ns);
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regmap_write(rcg->clkr.regmap, rcg->ns_reg, ns);
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ctl = mn_to_reg(mn, f->m, f->n, ctl);
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regmap_write(rcg->clkr.regmap, rcg->clkr.enable_reg, ctl);
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ns &= ~BIT(mn->mnctr_reset_bit);
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regmap_write(rcg->clkr.regmap, rcg->ns_reg, ns);
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} else {
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p = &rcg->p[new_bank];
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ns = pre_div_to_ns(p, f->pre_div - 1, ns);
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}
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s = &rcg->s[new_bank];
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ns = src_to_ns(s, s->parent_map[f->src], ns);
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regmap_write(rcg->clkr.regmap, rcg->ns_reg, ns);
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if (enabled) {
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*regp ^= BIT(rcg->mux_sel_bit);
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regmap_write(rcg->clkr.regmap, bank_reg, *regp);
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}
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}
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static int clk_dyn_rcg_set_parent(struct clk_hw *hw, u8 index)
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{
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struct clk_dyn_rcg *rcg = to_clk_dyn_rcg(hw);
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u32 ns, ctl, md, reg;
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int bank;
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struct freq_tbl f = { 0 };
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bool banked_mn = !!rcg->mn[1].width;
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regmap_read(rcg->clkr.regmap, rcg->ns_reg, &ns);
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regmap_read(rcg->clkr.regmap, rcg->clkr.enable_reg, &ctl);
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reg = banked_mn ? ctl : ns;
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bank = reg_to_bank(rcg, reg);
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if (banked_mn) {
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regmap_read(rcg->clkr.regmap, rcg->md_reg[bank], &md);
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f.m = md_to_m(&rcg->mn[bank], md);
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f.n = ns_m_to_n(&rcg->mn[bank], ns, f.m);
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} else {
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f.pre_div = ns_to_pre_div(&rcg->p[bank], ns) + 1;
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}
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f.src = index;
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configure_bank(rcg, &f);
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return 0;
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}
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/*
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* Calculate m/n:d rate
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*
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* parent_rate m
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* rate = ----------- x ---
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* pre_div n
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*/
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static unsigned long
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calc_rate(unsigned long rate, u32 m, u32 n, u32 mode, u32 pre_div)
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{
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if (pre_div)
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rate /= pre_div + 1;
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if (mode) {
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u64 tmp = rate;
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tmp *= m;
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do_div(tmp, n);
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rate = tmp;
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}
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return rate;
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}
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static unsigned long
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clk_rcg_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
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{
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struct clk_rcg *rcg = to_clk_rcg(hw);
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u32 pre_div, m = 0, n = 0, ns, md, mode = 0;
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struct mn *mn = &rcg->mn;
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regmap_read(rcg->clkr.regmap, rcg->ns_reg, &ns);
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pre_div = ns_to_pre_div(&rcg->p, ns);
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if (rcg->mn.width) {
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regmap_read(rcg->clkr.regmap, rcg->md_reg, &md);
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m = md_to_m(mn, md);
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n = ns_m_to_n(mn, ns, m);
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/* MN counter mode is in hw.enable_reg sometimes */
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if (rcg->clkr.enable_reg != rcg->ns_reg)
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regmap_read(rcg->clkr.regmap, rcg->clkr.enable_reg, &mode);
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else
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mode = ns;
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mode = reg_to_mnctr_mode(mn, mode);
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}
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return calc_rate(parent_rate, m, n, mode, pre_div);
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}
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static unsigned long
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clk_dyn_rcg_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
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{
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struct clk_dyn_rcg *rcg = to_clk_dyn_rcg(hw);
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u32 m, n, pre_div, ns, md, mode, reg;
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int bank;
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struct mn *mn;
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bool banked_mn = !!rcg->mn[1].width;
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regmap_read(rcg->clkr.regmap, rcg->ns_reg, &ns);
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if (banked_mn)
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regmap_read(rcg->clkr.regmap, rcg->clkr.enable_reg, ®);
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else
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reg = ns;
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bank = reg_to_bank(rcg, reg);
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if (banked_mn) {
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mn = &rcg->mn[bank];
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regmap_read(rcg->clkr.regmap, rcg->md_reg[bank], &md);
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m = md_to_m(mn, md);
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n = ns_m_to_n(mn, ns, m);
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mode = reg_to_mnctr_mode(mn, reg);
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return calc_rate(parent_rate, m, n, mode, 0);
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} else {
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pre_div = ns_to_pre_div(&rcg->p[bank], ns);
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return calc_rate(parent_rate, 0, 0, 0, pre_div);
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}
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}
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static const
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struct freq_tbl *find_freq(const struct freq_tbl *f, unsigned long rate)
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{
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if (!f)
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return NULL;
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for (; f->freq; f++)
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if (rate <= f->freq)
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return f;
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return NULL;
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}
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static long _freq_tbl_determine_rate(struct clk_hw *hw,
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const struct freq_tbl *f, unsigned long rate,
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unsigned long *p_rate, struct clk **p)
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{
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unsigned long clk_flags;
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f = find_freq(f, rate);
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if (!f)
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return -EINVAL;
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clk_flags = __clk_get_flags(hw->clk);
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*p = clk_get_parent_by_index(hw->clk, f->src);
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if (clk_flags & CLK_SET_RATE_PARENT) {
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rate = rate * f->pre_div;
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if (f->n) {
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u64 tmp = rate;
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tmp = tmp * f->n;
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do_div(tmp, f->m);
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rate = tmp;
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}
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} else {
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rate = __clk_get_rate(*p);
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}
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*p_rate = rate;
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return f->freq;
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}
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static long clk_rcg_determine_rate(struct clk_hw *hw, unsigned long rate,
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unsigned long *p_rate, struct clk **p)
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{
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struct clk_rcg *rcg = to_clk_rcg(hw);
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return _freq_tbl_determine_rate(hw, rcg->freq_tbl, rate, p_rate, p);
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}
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static long clk_dyn_rcg_determine_rate(struct clk_hw *hw, unsigned long rate,
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unsigned long *p_rate, struct clk **p)
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{
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struct clk_dyn_rcg *rcg = to_clk_dyn_rcg(hw);
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return _freq_tbl_determine_rate(hw, rcg->freq_tbl, rate, p_rate, p);
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}
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static int clk_rcg_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_rcg *rcg = to_clk_rcg(hw);
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const struct freq_tbl *f;
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u32 ns, md, ctl;
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struct mn *mn = &rcg->mn;
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u32 mask = 0;
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unsigned int reset_reg;
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f = find_freq(rcg->freq_tbl, rate);
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if (!f)
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return -EINVAL;
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if (rcg->mn.reset_in_cc)
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reset_reg = rcg->clkr.enable_reg;
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else
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reset_reg = rcg->ns_reg;
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if (rcg->mn.width) {
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mask = BIT(mn->mnctr_reset_bit);
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regmap_update_bits(rcg->clkr.regmap, reset_reg, mask, mask);
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regmap_read(rcg->clkr.regmap, rcg->md_reg, &md);
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md = mn_to_md(mn, f->m, f->n, md);
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regmap_write(rcg->clkr.regmap, rcg->md_reg, md);
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regmap_read(rcg->clkr.regmap, rcg->ns_reg, &ns);
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/* MN counter mode is in hw.enable_reg sometimes */
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if (rcg->clkr.enable_reg != rcg->ns_reg) {
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regmap_read(rcg->clkr.regmap, rcg->clkr.enable_reg, &ctl);
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ctl = mn_to_reg(mn, f->m, f->n, ctl);
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regmap_write(rcg->clkr.regmap, rcg->clkr.enable_reg, ctl);
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} else {
|
||||
ns = mn_to_reg(mn, f->m, f->n, ns);
|
||||
}
|
||||
ns = mn_to_ns(mn, f->m, f->n, ns);
|
||||
} else {
|
||||
regmap_read(rcg->clkr.regmap, rcg->ns_reg, &ns);
|
||||
}
|
||||
|
||||
ns = pre_div_to_ns(&rcg->p, f->pre_div - 1, ns);
|
||||
regmap_write(rcg->clkr.regmap, rcg->ns_reg, ns);
|
||||
|
||||
regmap_update_bits(rcg->clkr.regmap, reset_reg, mask, 0);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int __clk_dyn_rcg_set_rate(struct clk_hw *hw, unsigned long rate)
|
||||
{
|
||||
struct clk_dyn_rcg *rcg = to_clk_dyn_rcg(hw);
|
||||
const struct freq_tbl *f;
|
||||
|
||||
f = find_freq(rcg->freq_tbl, rate);
|
||||
if (!f)
|
||||
return -EINVAL;
|
||||
|
||||
configure_bank(rcg, f);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int clk_dyn_rcg_set_rate(struct clk_hw *hw, unsigned long rate,
|
||||
unsigned long parent_rate)
|
||||
{
|
||||
return __clk_dyn_rcg_set_rate(hw, rate);
|
||||
}
|
||||
|
||||
static int clk_dyn_rcg_set_rate_and_parent(struct clk_hw *hw,
|
||||
unsigned long rate, unsigned long parent_rate, u8 index)
|
||||
{
|
||||
return __clk_dyn_rcg_set_rate(hw, rate);
|
||||
}
|
||||
|
||||
const struct clk_ops clk_rcg_ops = {
|
||||
.enable = clk_enable_regmap,
|
||||
.disable = clk_disable_regmap,
|
||||
.get_parent = clk_rcg_get_parent,
|
||||
.set_parent = clk_rcg_set_parent,
|
||||
.recalc_rate = clk_rcg_recalc_rate,
|
||||
.determine_rate = clk_rcg_determine_rate,
|
||||
.set_rate = clk_rcg_set_rate,
|
||||
};
|
||||
EXPORT_SYMBOL_GPL(clk_rcg_ops);
|
||||
|
||||
const struct clk_ops clk_dyn_rcg_ops = {
|
||||
.enable = clk_enable_regmap,
|
||||
.is_enabled = clk_is_enabled_regmap,
|
||||
.disable = clk_disable_regmap,
|
||||
.get_parent = clk_dyn_rcg_get_parent,
|
||||
.set_parent = clk_dyn_rcg_set_parent,
|
||||
.recalc_rate = clk_dyn_rcg_recalc_rate,
|
||||
.determine_rate = clk_dyn_rcg_determine_rate,
|
||||
.set_rate = clk_dyn_rcg_set_rate,
|
||||
.set_rate_and_parent = clk_dyn_rcg_set_rate_and_parent,
|
||||
};
|
||||
EXPORT_SYMBOL_GPL(clk_dyn_rcg_ops);
|
||||
|
|
@ -0,0 +1,159 @@
|
|||
/*
|
||||
* Copyright (c) 2013, The Linux Foundation. All rights reserved.
|
||||
*
|
||||
* This software is licensed under the terms of the GNU General Public
|
||||
* License version 2, as published by the Free Software Foundation, and
|
||||
* may be copied, distributed, and modified under those terms.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*/
|
||||
|
||||
#ifndef __QCOM_CLK_RCG_H__
|
||||
#define __QCOM_CLK_RCG_H__
|
||||
|
||||
#include <linux/clk-provider.h>
|
||||
#include "clk-regmap.h"
|
||||
|
||||
struct freq_tbl {
|
||||
unsigned long freq;
|
||||
u8 src;
|
||||
u8 pre_div;
|
||||
u16 m;
|
||||
u16 n;
|
||||
};
|
||||
|
||||
/**
|
||||
* struct mn - M/N:D counter
|
||||
* @mnctr_en_bit: bit to enable mn counter
|
||||
* @mnctr_reset_bit: bit to assert mn counter reset
|
||||
* @mnctr_mode_shift: lowest bit of mn counter mode field
|
||||
* @n_val_shift: lowest bit of n value field
|
||||
* @m_val_shift: lowest bit of m value field
|
||||
* @width: number of bits in m/n/d values
|
||||
* @reset_in_cc: true if the mnctr_reset_bit is in the CC register
|
||||
*/
|
||||
struct mn {
|
||||
u8 mnctr_en_bit;
|
||||
u8 mnctr_reset_bit;
|
||||
u8 mnctr_mode_shift;
|
||||
#define MNCTR_MODE_DUAL 0x2
|
||||
#define MNCTR_MODE_MASK 0x3
|
||||
u8 n_val_shift;
|
||||
u8 m_val_shift;
|
||||
u8 width;
|
||||
bool reset_in_cc;
|
||||
};
|
||||
|
||||
/**
|
||||
* struct pre_div - pre-divider
|
||||
* @pre_div_shift: lowest bit of pre divider field
|
||||
* @pre_div_width: number of bits in predivider
|
||||
*/
|
||||
struct pre_div {
|
||||
u8 pre_div_shift;
|
||||
u8 pre_div_width;
|
||||
};
|
||||
|
||||
/**
|
||||
* struct src_sel - source selector
|
||||
* @src_sel_shift: lowest bit of source selection field
|
||||
* @parent_map: map from software's parent index to hardware's src_sel field
|
||||
*/
|
||||
struct src_sel {
|
||||
u8 src_sel_shift;
|
||||
#define SRC_SEL_MASK 0x7
|
||||
const u8 *parent_map;
|
||||
};
|
||||
|
||||
/**
|
||||
* struct clk_rcg - root clock generator
|
||||
*
|
||||
* @ns_reg: NS register
|
||||
* @md_reg: MD register
|
||||
* @mn: mn counter
|
||||
* @p: pre divider
|
||||
* @s: source selector
|
||||
* @freq_tbl: frequency table
|
||||
* @clkr: regmap clock handle
|
||||
* @lock: register lock
|
||||
*
|
||||
*/
|
||||
struct clk_rcg {
|
||||
u32 ns_reg;
|
||||
u32 md_reg;
|
||||
|
||||
struct mn mn;
|
||||
struct pre_div p;
|
||||
struct src_sel s;
|
||||
|
||||
const struct freq_tbl *freq_tbl;
|
||||
|
||||
struct clk_regmap clkr;
|
||||
};
|
||||
|
||||
extern const struct clk_ops clk_rcg_ops;
|
||||
|
||||
#define to_clk_rcg(_hw) container_of(to_clk_regmap(_hw), struct clk_rcg, clkr)
|
||||
|
||||
/**
|
||||
* struct clk_dyn_rcg - root clock generator with glitch free mux
|
||||
*
|
||||
* @mux_sel_bit: bit to switch glitch free mux
|
||||
* @ns_reg: NS register
|
||||
* @md_reg: MD0 and MD1 register
|
||||
* @mn: mn counter (banked)
|
||||
* @s: source selector (banked)
|
||||
* @freq_tbl: frequency table
|
||||
* @clkr: regmap clock handle
|
||||
* @lock: register lock
|
||||
*
|
||||
*/
|
||||
struct clk_dyn_rcg {
|
||||
u32 ns_reg;
|
||||
u32 md_reg[2];
|
||||
|
||||
u8 mux_sel_bit;
|
||||
|
||||
struct mn mn[2];
|
||||
struct pre_div p[2];
|
||||
struct src_sel s[2];
|
||||
|
||||
const struct freq_tbl *freq_tbl;
|
||||
|
||||
struct clk_regmap clkr;
|
||||
};
|
||||
|
||||
extern const struct clk_ops clk_dyn_rcg_ops;
|
||||
|
||||
#define to_clk_dyn_rcg(_hw) \
|
||||
container_of(to_clk_regmap(_hw), struct clk_dyn_rcg, clkr)
|
||||
|
||||
/**
|
||||
* struct clk_rcg2 - root clock generator
|
||||
*
|
||||
* @cmd_rcgr: corresponds to *_CMD_RCGR
|
||||
* @mnd_width: number of bits in m/n/d values
|
||||
* @hid_width: number of bits in half integer divider
|
||||
* @parent_map: map from software's parent index to hardware's src_sel field
|
||||
* @freq_tbl: frequency table
|
||||
* @clkr: regmap clock handle
|
||||
* @lock: register lock
|
||||
*
|
||||
*/
|
||||
struct clk_rcg2 {
|
||||
u32 cmd_rcgr;
|
||||
u8 mnd_width;
|
||||
u8 hid_width;
|
||||
const u8 *parent_map;
|
||||
const struct freq_tbl *freq_tbl;
|
||||
struct clk_regmap clkr;
|
||||
};
|
||||
|
||||
#define to_clk_rcg2(_hw) container_of(to_clk_regmap(_hw), struct clk_rcg2, clkr)
|
||||
|
||||
extern const struct clk_ops clk_rcg2_ops;
|
||||
|
||||
#endif
|
||||
|
|
@ -0,0 +1,291 @@
|
|||
/*
|
||||
* Copyright (c) 2013, The Linux Foundation. All rights reserved.
|
||||
*
|
||||
* This software is licensed under the terms of the GNU General Public
|
||||
* License version 2, as published by the Free Software Foundation, and
|
||||
* may be copied, distributed, and modified under those terms.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*/
|
||||
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/bitops.h>
|
||||
#include <linux/err.h>
|
||||
#include <linux/bug.h>
|
||||
#include <linux/export.h>
|
||||
#include <linux/clk-provider.h>
|
||||
#include <linux/delay.h>
|
||||
#include <linux/regmap.h>
|
||||
|
||||
#include <asm/div64.h>
|
||||
|
||||
#include "clk-rcg.h"
|
||||
|
||||
#define CMD_REG 0x0
|
||||
#define CMD_UPDATE BIT(0)
|
||||
#define CMD_ROOT_EN BIT(1)
|
||||
#define CMD_DIRTY_CFG BIT(4)
|
||||
#define CMD_DIRTY_N BIT(5)
|
||||
#define CMD_DIRTY_M BIT(6)
|
||||
#define CMD_DIRTY_D BIT(7)
|
||||
#define CMD_ROOT_OFF BIT(31)
|
||||
|
||||
#define CFG_REG 0x4
|
||||
#define CFG_SRC_DIV_SHIFT 0
|
||||
#define CFG_SRC_SEL_SHIFT 8
|
||||
#define CFG_SRC_SEL_MASK (0x7 << CFG_SRC_SEL_SHIFT)
|
||||
#define CFG_MODE_SHIFT 12
|
||||
#define CFG_MODE_MASK (0x3 << CFG_MODE_SHIFT)
|
||||
#define CFG_MODE_DUAL_EDGE (0x2 << CFG_MODE_SHIFT)
|
||||
|
||||
#define M_REG 0x8
|
||||
#define N_REG 0xc
|
||||
#define D_REG 0x10
|
||||
|
||||
static int clk_rcg2_is_enabled(struct clk_hw *hw)
|
||||
{
|
||||
struct clk_rcg2 *rcg = to_clk_rcg2(hw);
|
||||
u32 cmd;
|
||||
int ret;
|
||||
|
||||
ret = regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CMD_REG, &cmd);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
return (cmd & CMD_ROOT_OFF) != 0;
|
||||
}
|
||||
|
||||
static u8 clk_rcg2_get_parent(struct clk_hw *hw)
|
||||
{
|
||||
struct clk_rcg2 *rcg = to_clk_rcg2(hw);
|
||||
int num_parents = __clk_get_num_parents(hw->clk);
|
||||
u32 cfg;
|
||||
int i, ret;
|
||||
|
||||
ret = regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, &cfg);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
cfg &= CFG_SRC_SEL_MASK;
|
||||
cfg >>= CFG_SRC_SEL_SHIFT;
|
||||
|
||||
for (i = 0; i < num_parents; i++)
|
||||
if (cfg == rcg->parent_map[i])
|
||||
return i;
|
||||
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
static int update_config(struct clk_rcg2 *rcg)
|
||||
{
|
||||
int count, ret;
|
||||
u32 cmd;
|
||||
struct clk_hw *hw = &rcg->clkr.hw;
|
||||
const char *name = __clk_get_name(hw->clk);
|
||||
|
||||
ret = regmap_update_bits(rcg->clkr.regmap, rcg->cmd_rcgr + CMD_REG,
|
||||
CMD_UPDATE, CMD_UPDATE);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
/* Wait for update to take effect */
|
||||
for (count = 500; count > 0; count--) {
|
||||
ret = regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CMD_REG, &cmd);
|
||||
if (ret)
|
||||
return ret;
|
||||
if (!(cmd & CMD_UPDATE))
|
||||
return 0;
|
||||
udelay(1);
|
||||
}
|
||||
|
||||
WARN(1, "%s: rcg didn't update its configuration.", name);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int clk_rcg2_set_parent(struct clk_hw *hw, u8 index)
|
||||
{
|
||||
struct clk_rcg2 *rcg = to_clk_rcg2(hw);
|
||||
int ret;
|
||||
|
||||
ret = regmap_update_bits(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG,
|
||||
CFG_SRC_SEL_MASK,
|
||||
rcg->parent_map[index] << CFG_SRC_SEL_SHIFT);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
return update_config(rcg);
|
||||
}
|
||||
|
||||
/*
|
||||
* Calculate m/n:d rate
|
||||
*
|
||||
* parent_rate m
|
||||
* rate = ----------- x ---
|
||||
* hid_div n
|
||||
*/
|
||||
static unsigned long
|
||||
calc_rate(unsigned long rate, u32 m, u32 n, u32 mode, u32 hid_div)
|
||||
{
|
||||
if (hid_div) {
|
||||
rate *= 2;
|
||||
rate /= hid_div + 1;
|
||||
}
|
||||
|
||||
if (mode) {
|
||||
u64 tmp = rate;
|
||||
tmp *= m;
|
||||
do_div(tmp, n);
|
||||
rate = tmp;
|
||||
}
|
||||
|
||||
return rate;
|
||||
}
|
||||
|
||||
static unsigned long
|
||||
clk_rcg2_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
|
||||
{
|
||||
struct clk_rcg2 *rcg = to_clk_rcg2(hw);
|
||||
u32 cfg, hid_div, m = 0, n = 0, mode = 0, mask;
|
||||
|
||||
regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, &cfg);
|
||||
|
||||
if (rcg->mnd_width) {
|
||||
mask = BIT(rcg->mnd_width) - 1;
|
||||
regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + M_REG, &m);
|
||||
m &= mask;
|
||||
regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + N_REG, &n);
|
||||
n = ~n;
|
||||
n &= mask;
|
||||
n += m;
|
||||
mode = cfg & CFG_MODE_MASK;
|
||||
mode >>= CFG_MODE_SHIFT;
|
||||
}
|
||||
|
||||
mask = BIT(rcg->hid_width) - 1;
|
||||
hid_div = cfg >> CFG_SRC_DIV_SHIFT;
|
||||
hid_div &= mask;
|
||||
|
||||
return calc_rate(parent_rate, m, n, mode, hid_div);
|
||||
}
|
||||
|
||||
static const
|
||||
struct freq_tbl *find_freq(const struct freq_tbl *f, unsigned long rate)
|
||||
{
|
||||
if (!f)
|
||||
return NULL;
|
||||
|
||||
for (; f->freq; f++)
|
||||
if (rate <= f->freq)
|
||||
return f;
|
||||
|
||||
return NULL;
|
||||
}
|
||||
|
||||
static long _freq_tbl_determine_rate(struct clk_hw *hw,
|
||||
const struct freq_tbl *f, unsigned long rate,
|
||||
unsigned long *p_rate, struct clk **p)
|
||||
{
|
||||
unsigned long clk_flags;
|
||||
|
||||
f = find_freq(f, rate);
|
||||
if (!f)
|
||||
return -EINVAL;
|
||||
|
||||
clk_flags = __clk_get_flags(hw->clk);
|
||||
*p = clk_get_parent_by_index(hw->clk, f->src);
|
||||
if (clk_flags & CLK_SET_RATE_PARENT) {
|
||||
if (f->pre_div) {
|
||||
rate /= 2;
|
||||
rate *= f->pre_div + 1;
|
||||
}
|
||||
|
||||
if (f->n) {
|
||||
u64 tmp = rate;
|
||||
tmp = tmp * f->n;
|
||||
do_div(tmp, f->m);
|
||||
rate = tmp;
|
||||
}
|
||||
} else {
|
||||
rate = __clk_get_rate(*p);
|
||||
}
|
||||
*p_rate = rate;
|
||||
|
||||
return f->freq;
|
||||
}
|
||||
|
||||
static long clk_rcg2_determine_rate(struct clk_hw *hw, unsigned long rate,
|
||||
unsigned long *p_rate, struct clk **p)
|
||||
{
|
||||
struct clk_rcg2 *rcg = to_clk_rcg2(hw);
|
||||
|
||||
return _freq_tbl_determine_rate(hw, rcg->freq_tbl, rate, p_rate, p);
|
||||
}
|
||||
|
||||
static int __clk_rcg2_set_rate(struct clk_hw *hw, unsigned long rate)
|
||||
{
|
||||
struct clk_rcg2 *rcg = to_clk_rcg2(hw);
|
||||
const struct freq_tbl *f;
|
||||
u32 cfg, mask;
|
||||
int ret;
|
||||
|
||||
f = find_freq(rcg->freq_tbl, rate);
|
||||
if (!f)
|
||||
return -EINVAL;
|
||||
|
||||
if (rcg->mnd_width && f->n) {
|
||||
mask = BIT(rcg->mnd_width) - 1;
|
||||
ret = regmap_update_bits(rcg->clkr.regmap, rcg->cmd_rcgr + M_REG,
|
||||
mask, f->m);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
ret = regmap_update_bits(rcg->clkr.regmap, rcg->cmd_rcgr + N_REG,
|
||||
mask, ~(f->n - f->m));
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
ret = regmap_update_bits(rcg->clkr.regmap, rcg->cmd_rcgr + D_REG,
|
||||
mask, ~f->n);
|
||||
if (ret)
|
||||
return ret;
|
||||
}
|
||||
|
||||
mask = BIT(rcg->hid_width) - 1;
|
||||
mask |= CFG_SRC_SEL_MASK | CFG_MODE_MASK;
|
||||
cfg = f->pre_div << CFG_SRC_DIV_SHIFT;
|
||||
cfg |= rcg->parent_map[f->src] << CFG_SRC_SEL_SHIFT;
|
||||
if (rcg->mnd_width && f->n)
|
||||
cfg |= CFG_MODE_DUAL_EDGE;
|
||||
ret = regmap_update_bits(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, mask,
|
||||
cfg);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
return update_config(rcg);
|
||||
}
|
||||
|
||||
static int clk_rcg2_set_rate(struct clk_hw *hw, unsigned long rate,
|
||||
unsigned long parent_rate)
|
||||
{
|
||||
return __clk_rcg2_set_rate(hw, rate);
|
||||
}
|
||||
|
||||
static int clk_rcg2_set_rate_and_parent(struct clk_hw *hw,
|
||||
unsigned long rate, unsigned long parent_rate, u8 index)
|
||||
{
|
||||
return __clk_rcg2_set_rate(hw, rate);
|
||||
}
|
||||
|
||||
const struct clk_ops clk_rcg2_ops = {
|
||||
.is_enabled = clk_rcg2_is_enabled,
|
||||
.get_parent = clk_rcg2_get_parent,
|
||||
.set_parent = clk_rcg2_set_parent,
|
||||
.recalc_rate = clk_rcg2_recalc_rate,
|
||||
.determine_rate = clk_rcg2_determine_rate,
|
||||
.set_rate = clk_rcg2_set_rate,
|
||||
.set_rate_and_parent = clk_rcg2_set_rate_and_parent,
|
||||
};
|
||||
EXPORT_SYMBOL_GPL(clk_rcg2_ops);
|
||||
Loading…
Reference in New Issue