670 lines
16 KiB
C
670 lines
16 KiB
C
/*
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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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#include "common.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, ret;
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ret = regmap_read(rcg->clkr.regmap, rcg->ns_reg, &ns);
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if (ret)
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goto err;
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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].cfg)
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return i;
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err:
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pr_debug("%s: Clock %s has invalid parent, using default.\n",
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__func__, __clk_get_name(hw->clk));
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return 0;
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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, reg;
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int bank;
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int i, ret;
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struct src_sel *s;
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ret = regmap_read(rcg->clkr.regmap, rcg->bank_reg, ®);
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if (ret)
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goto err;
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bank = reg_to_bank(rcg, reg);
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s = &rcg->s[bank];
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ret = regmap_read(rcg->clkr.regmap, rcg->ns_reg[bank], &ns);
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if (ret)
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goto err;
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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].cfg)
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return i;
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err:
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pr_debug("%s: Clock %s has invalid parent, using default.\n",
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__func__, __clk_get_name(hw->clk));
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return 0;
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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].cfg, 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 int configure_bank(struct clk_dyn_rcg *rcg, const struct freq_tbl *f)
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{
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u32 ns, md, reg;
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int bank, new_bank, ret, index;
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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, ns_reg;
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bool banked_mn = !!rcg->mn[1].width;
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bool banked_p = !!rcg->p[1].pre_div_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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ret = regmap_read(rcg->clkr.regmap, rcg->bank_reg, ®);
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if (ret)
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return ret;
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bank = reg_to_bank(rcg, reg);
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new_bank = enabled ? !bank : bank;
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ns_reg = rcg->ns_reg[new_bank];
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ret = regmap_read(rcg->clkr.regmap, ns_reg, &ns);
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if (ret)
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return ret;
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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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ret = regmap_write(rcg->clkr.regmap, ns_reg, ns);
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if (ret)
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return ret;
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ret = regmap_read(rcg->clkr.regmap, md_reg, &md);
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if (ret)
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return ret;
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md = mn_to_md(mn, f->m, f->n, md);
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ret = regmap_write(rcg->clkr.regmap, md_reg, md);
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if (ret)
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return ret;
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ns = mn_to_ns(mn, f->m, f->n, ns);
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ret = regmap_write(rcg->clkr.regmap, ns_reg, ns);
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if (ret)
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return ret;
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/* Two NS registers means mode control is in NS register */
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if (rcg->ns_reg[0] != rcg->ns_reg[1]) {
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ns = mn_to_reg(mn, f->m, f->n, ns);
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ret = regmap_write(rcg->clkr.regmap, ns_reg, ns);
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if (ret)
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return ret;
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} else {
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reg = mn_to_reg(mn, f->m, f->n, reg);
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ret = regmap_write(rcg->clkr.regmap, rcg->bank_reg,
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reg);
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if (ret)
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return ret;
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}
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ns &= ~BIT(mn->mnctr_reset_bit);
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ret = regmap_write(rcg->clkr.regmap, ns_reg, ns);
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if (ret)
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return ret;
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}
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if (banked_p) {
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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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index = qcom_find_src_index(hw, s->parent_map, f->src);
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if (index < 0)
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return index;
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ns = src_to_ns(s, s->parent_map[index].cfg, ns);
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ret = regmap_write(rcg->clkr.regmap, ns_reg, ns);
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if (ret)
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return ret;
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if (enabled) {
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ret = regmap_read(rcg->clkr.regmap, rcg->bank_reg, ®);
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if (ret)
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return ret;
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reg ^= BIT(rcg->mux_sel_bit);
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ret = regmap_write(rcg->clkr.regmap, rcg->bank_reg, reg);
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if (ret)
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return ret;
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}
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return 0;
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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, 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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bool banked_p = !!rcg->p[1].pre_div_width;
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regmap_read(rcg->clkr.regmap, rcg->bank_reg, ®);
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bank = reg_to_bank(rcg, reg);
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regmap_read(rcg->clkr.regmap, rcg->ns_reg[bank], &ns);
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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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}
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if (banked_p)
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f.pre_div = ns_to_pre_div(&rcg->p[bank], ns) + 1;
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f.src = qcom_find_src_index(hw, rcg->s[bank].parent_map, index);
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return configure_bank(rcg, &f);
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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_p = !!rcg->p[1].pre_div_width;
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bool banked_mn = !!rcg->mn[1].width;
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regmap_read(rcg->clkr.regmap, rcg->bank_reg, ®);
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bank = reg_to_bank(rcg, reg);
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regmap_read(rcg->clkr.regmap, rcg->ns_reg[bank], &ns);
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m = n = pre_div = mode = 0;
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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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/* Two NS registers means mode control is in NS register */
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if (rcg->ns_reg[0] != rcg->ns_reg[1])
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reg = ns;
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mode = reg_to_mnctr_mode(mn, reg);
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}
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if (banked_p)
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pre_div = ns_to_pre_div(&rcg->p[bank], ns);
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return calc_rate(parent_rate, m, n, mode, pre_div);
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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 min_rate, unsigned long max_rate,
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unsigned long *p_rate, struct clk_hw **p_hw,
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const struct parent_map *parent_map)
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{
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unsigned long clk_flags;
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struct clk *p;
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int index;
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f = qcom_find_freq(f, rate);
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if (!f)
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return -EINVAL;
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index = qcom_find_src_index(hw, parent_map, f->src);
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if (index < 0)
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return index;
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clk_flags = __clk_get_flags(hw->clk);
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p = clk_get_parent_by_index(hw->clk, index);
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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_hw = __clk_get_hw(p);
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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 min_rate, unsigned long max_rate,
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unsigned long *p_rate, struct clk_hw **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, min_rate,
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max_rate, p_rate, p, rcg->s.parent_map);
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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 min_rate, unsigned long max_rate,
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unsigned long *p_rate, struct clk_hw **p)
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{
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struct clk_dyn_rcg *rcg = to_clk_dyn_rcg(hw);
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u32 reg;
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int bank;
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struct src_sel *s;
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regmap_read(rcg->clkr.regmap, rcg->bank_reg, ®);
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bank = reg_to_bank(rcg, reg);
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s = &rcg->s[bank];
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return _freq_tbl_determine_rate(hw, rcg->freq_tbl, rate, min_rate,
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max_rate, p_rate, p, s->parent_map);
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}
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static long clk_rcg_bypass_determine_rate(struct clk_hw *hw, unsigned long rate,
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unsigned long min_rate, unsigned long max_rate,
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unsigned long *p_rate, struct clk_hw **p_hw)
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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 = rcg->freq_tbl;
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struct clk *p;
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int index = qcom_find_src_index(hw, rcg->s.parent_map, f->src);
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p = clk_get_parent_by_index(hw->clk, index);
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*p_hw = __clk_get_hw(p);
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*p_rate = __clk_round_rate(p, rate);
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return *p_rate;
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}
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static int __clk_rcg_set_rate(struct clk_rcg *rcg, const struct freq_tbl *f)
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{
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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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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);
|
|
regmap_update_bits(rcg->clkr.regmap, reset_reg, mask, mask);
|
|
|
|
regmap_read(rcg->clkr.regmap, rcg->md_reg, &md);
|
|
md = mn_to_md(mn, f->m, f->n, md);
|
|
regmap_write(rcg->clkr.regmap, rcg->md_reg, md);
|
|
|
|
regmap_read(rcg->clkr.regmap, rcg->ns_reg, &ns);
|
|
/* MN counter mode is in hw.enable_reg sometimes */
|
|
if (rcg->clkr.enable_reg != rcg->ns_reg) {
|
|
regmap_read(rcg->clkr.regmap, rcg->clkr.enable_reg, &ctl);
|
|
ctl = mn_to_reg(mn, f->m, f->n, ctl);
|
|
regmap_write(rcg->clkr.regmap, rcg->clkr.enable_reg, ctl);
|
|
} 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_rcg_set_rate(struct clk_hw *hw, unsigned long rate,
|
|
unsigned long parent_rate)
|
|
{
|
|
struct clk_rcg *rcg = to_clk_rcg(hw);
|
|
const struct freq_tbl *f;
|
|
|
|
f = qcom_find_freq(rcg->freq_tbl, rate);
|
|
if (!f)
|
|
return -EINVAL;
|
|
|
|
return __clk_rcg_set_rate(rcg, f);
|
|
}
|
|
|
|
static int clk_rcg_bypass_set_rate(struct clk_hw *hw, unsigned long rate,
|
|
unsigned long parent_rate)
|
|
{
|
|
struct clk_rcg *rcg = to_clk_rcg(hw);
|
|
|
|
return __clk_rcg_set_rate(rcg, rcg->freq_tbl);
|
|
}
|
|
|
|
/*
|
|
* This type of clock has a glitch-free mux that switches between the output of
|
|
* the M/N counter and an always on clock source (XO). When clk_set_rate() is
|
|
* called we need to make sure that we don't switch to the M/N counter if it
|
|
* isn't clocking because the mux will get stuck and the clock will stop
|
|
* outputting a clock. This can happen if the framework isn't aware that this
|
|
* clock is on and so clk_set_rate() doesn't turn on the new parent. To fix
|
|
* this we switch the mux in the enable/disable ops and reprogram the M/N
|
|
* counter in the set_rate op. We also make sure to switch away from the M/N
|
|
* counter in set_rate if software thinks the clock is off.
|
|
*/
|
|
static int clk_rcg_lcc_set_rate(struct clk_hw *hw, unsigned long rate,
|
|
unsigned long parent_rate)
|
|
{
|
|
struct clk_rcg *rcg = to_clk_rcg(hw);
|
|
const struct freq_tbl *f;
|
|
int ret;
|
|
u32 gfm = BIT(10);
|
|
|
|
f = qcom_find_freq(rcg->freq_tbl, rate);
|
|
if (!f)
|
|
return -EINVAL;
|
|
|
|
/* Switch to XO to avoid glitches */
|
|
regmap_update_bits(rcg->clkr.regmap, rcg->ns_reg, gfm, 0);
|
|
ret = __clk_rcg_set_rate(rcg, f);
|
|
/* Switch back to M/N if it's clocking */
|
|
if (__clk_is_enabled(hw->clk))
|
|
regmap_update_bits(rcg->clkr.regmap, rcg->ns_reg, gfm, gfm);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int clk_rcg_lcc_enable(struct clk_hw *hw)
|
|
{
|
|
struct clk_rcg *rcg = to_clk_rcg(hw);
|
|
u32 gfm = BIT(10);
|
|
|
|
/* Use M/N */
|
|
return regmap_update_bits(rcg->clkr.regmap, rcg->ns_reg, gfm, gfm);
|
|
}
|
|
|
|
static void clk_rcg_lcc_disable(struct clk_hw *hw)
|
|
{
|
|
struct clk_rcg *rcg = to_clk_rcg(hw);
|
|
u32 gfm = BIT(10);
|
|
|
|
/* Use XO */
|
|
regmap_update_bits(rcg->clkr.regmap, rcg->ns_reg, gfm, 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 = qcom_find_freq(rcg->freq_tbl, rate);
|
|
if (!f)
|
|
return -EINVAL;
|
|
|
|
return configure_bank(rcg, f);
|
|
}
|
|
|
|
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_rcg_bypass_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_bypass_determine_rate,
|
|
.set_rate = clk_rcg_bypass_set_rate,
|
|
};
|
|
EXPORT_SYMBOL_GPL(clk_rcg_bypass_ops);
|
|
|
|
const struct clk_ops clk_rcg_lcc_ops = {
|
|
.enable = clk_rcg_lcc_enable,
|
|
.disable = clk_rcg_lcc_disable,
|
|
.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_lcc_set_rate,
|
|
};
|
|
EXPORT_SYMBOL_GPL(clk_rcg_lcc_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);
|