diff options
author | Stephen Boyd <sboyd@codeaurora.org> | 2014-01-15 10:47:25 -0800 |
---|---|---|
committer | Mike Turquette <mturquette@linaro.org> | 2014-01-16 12:01:00 -0800 |
commit | bcd61c0f535a04a2aaa3f3ba27e60fae681fc88f (patch) | |
tree | 81fbb7830130ed91c207a3f088a9b5683a9f089e /drivers/clk/qcom | |
parent | 9e2631313c463c11645db046beb9bdecaf28b62f (diff) | |
download | linux-stable-bcd61c0f535a04a2aaa3f3ba27e60fae681fc88f.tar.gz linux-stable-bcd61c0f535a04a2aaa3f3ba27e60fae681fc88f.tar.bz2 linux-stable-bcd61c0f535a04a2aaa3f3ba27e60fae681fc88f.zip |
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>
Diffstat (limited to 'drivers/clk/qcom')
-rw-r--r-- | drivers/clk/qcom/Makefile | 2 | ||||
-rw-r--r-- | drivers/clk/qcom/clk-rcg.c | 517 | ||||
-rw-r--r-- | drivers/clk/qcom/clk-rcg.h | 159 | ||||
-rw-r--r-- | drivers/clk/qcom/clk-rcg2.c | 291 |
4 files changed, 969 insertions, 0 deletions
diff --git a/drivers/clk/qcom/Makefile b/drivers/clk/qcom/Makefile index 7871e235c2b1..5d0a6e0ac01f 100644 --- a/drivers/clk/qcom/Makefile +++ b/drivers/clk/qcom/Makefile @@ -2,3 +2,5 @@ obj-$(CONFIG_COMMON_CLK_QCOM) += clk-qcom.o clk-qcom-$(CONFIG_COMMON_CLK_QCOM) += clk-regmap.o clk-qcom-$(CONFIG_COMMON_CLK_QCOM) += clk-pll.o +clk-qcom-$(CONFIG_COMMON_CLK_QCOM) += clk-rcg.o +clk-qcom-$(CONFIG_COMMON_CLK_QCOM) += clk-rcg2.o diff --git a/drivers/clk/qcom/clk-rcg.c b/drivers/clk/qcom/clk-rcg.c new file mode 100644 index 000000000000..abfc2b675aea --- /dev/null +++ b/drivers/clk/qcom/clk-rcg.c @@ -0,0 +1,517 @@ +/* + * 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/export.h> +#include <linux/clk-provider.h> +#include <linux/regmap.h> + +#include <asm/div64.h> + +#include "clk-rcg.h" + +static u32 ns_to_src(struct src_sel *s, u32 ns) +{ + ns >>= s->src_sel_shift; + ns &= SRC_SEL_MASK; + return ns; +} + +static u32 src_to_ns(struct src_sel *s, u8 src, u32 ns) +{ + u32 mask; + + mask = SRC_SEL_MASK; + mask <<= s->src_sel_shift; + ns &= ~mask; + + ns |= src << s->src_sel_shift; + return ns; +} + +static u8 clk_rcg_get_parent(struct clk_hw *hw) +{ + struct clk_rcg *rcg = to_clk_rcg(hw); + int num_parents = __clk_get_num_parents(hw->clk); + u32 ns; + int i; + + regmap_read(rcg->clkr.regmap, rcg->ns_reg, &ns); + ns = ns_to_src(&rcg->s, ns); + for (i = 0; i < num_parents; i++) + if (ns == rcg->s.parent_map[i]) + return i; + + return -EINVAL; +} + +static int reg_to_bank(struct clk_dyn_rcg *rcg, u32 bank) +{ + bank &= BIT(rcg->mux_sel_bit); + return !!bank; +} + +static u8 clk_dyn_rcg_get_parent(struct clk_hw *hw) +{ + struct clk_dyn_rcg *rcg = to_clk_dyn_rcg(hw); + int num_parents = __clk_get_num_parents(hw->clk); + u32 ns, ctl; + int bank; + int i; + struct src_sel *s; + + regmap_read(rcg->clkr.regmap, rcg->clkr.enable_reg, &ctl); + bank = reg_to_bank(rcg, ctl); + s = &rcg->s[bank]; + + regmap_read(rcg->clkr.regmap, rcg->ns_reg, &ns); + ns = ns_to_src(s, ns); + + for (i = 0; i < num_parents; i++) + if (ns == s->parent_map[i]) + return i; + + return -EINVAL; +} + +static int clk_rcg_set_parent(struct clk_hw *hw, u8 index) +{ + struct clk_rcg *rcg = to_clk_rcg(hw); + u32 ns; + + regmap_read(rcg->clkr.regmap, rcg->ns_reg, &ns); + ns = src_to_ns(&rcg->s, rcg->s.parent_map[index], ns); + regmap_write(rcg->clkr.regmap, rcg->ns_reg, ns); + + return 0; +} + +static u32 md_to_m(struct mn *mn, u32 md) +{ + md >>= mn->m_val_shift; + md &= BIT(mn->width) - 1; + return md; +} + +static u32 ns_to_pre_div(struct pre_div *p, u32 ns) +{ + ns >>= p->pre_div_shift; + ns &= BIT(p->pre_div_width) - 1; + return ns; +} + +static u32 pre_div_to_ns(struct pre_div *p, u8 pre_div, u32 ns) +{ + u32 mask; + + mask = BIT(p->pre_div_width) - 1; + mask <<= p->pre_div_shift; + ns &= ~mask; + + ns |= pre_div << p->pre_div_shift; + return ns; +} + +static u32 mn_to_md(struct mn *mn, u32 m, u32 n, u32 md) +{ + u32 mask, mask_w; + + mask_w = BIT(mn->width) - 1; + mask = (mask_w << mn->m_val_shift) | mask_w; + md &= ~mask; + + if (n) { + m <<= mn->m_val_shift; + md |= m; + md |= ~n & mask_w; + } + + return md; +} + +static u32 ns_m_to_n(struct mn *mn, u32 ns, u32 m) +{ + ns = ~ns >> mn->n_val_shift; + ns &= BIT(mn->width) - 1; + return ns + m; +} + +static u32 reg_to_mnctr_mode(struct mn *mn, u32 val) +{ + val >>= mn->mnctr_mode_shift; + val &= MNCTR_MODE_MASK; + return val; +} + +static u32 mn_to_ns(struct mn *mn, u32 m, u32 n, u32 ns) +{ + u32 mask; + + mask = BIT(mn->width) - 1; + mask <<= mn->n_val_shift; + ns &= ~mask; + + if (n) { + n = n - m; + n = ~n; + n &= BIT(mn->width) - 1; + n <<= mn->n_val_shift; + ns |= n; + } + + return ns; +} + +static u32 mn_to_reg(struct mn *mn, u32 m, u32 n, u32 val) +{ + u32 mask; + + mask = MNCTR_MODE_MASK << mn->mnctr_mode_shift; + mask |= BIT(mn->mnctr_en_bit); + val &= ~mask; + + if (n) { + val |= BIT(mn->mnctr_en_bit); + val |= MNCTR_MODE_DUAL << mn->mnctr_mode_shift; + } + + return val; +} + +static void configure_bank(struct clk_dyn_rcg *rcg, const struct freq_tbl *f) +{ + u32 ns, md, ctl, *regp; + int bank, new_bank; + struct mn *mn; + struct pre_div *p; + struct src_sel *s; + bool enabled; + u32 md_reg; + u32 bank_reg; + bool banked_mn = !!rcg->mn[1].width; + struct clk_hw *hw = &rcg->clkr.hw; + + enabled = __clk_is_enabled(hw->clk); + + regmap_read(rcg->clkr.regmap, rcg->ns_reg, &ns); + regmap_read(rcg->clkr.regmap, rcg->clkr.enable_reg, &ctl); + + if (banked_mn) { + regp = &ctl; + bank_reg = rcg->clkr.enable_reg; + } else { + regp = &ns; + bank_reg = rcg->ns_reg; + } + + bank = reg_to_bank(rcg, *regp); + new_bank = enabled ? !bank : bank; + + if (banked_mn) { + mn = &rcg->mn[new_bank]; + md_reg = rcg->md_reg[new_bank]; + + ns |= BIT(mn->mnctr_reset_bit); + regmap_write(rcg->clkr.regmap, rcg->ns_reg, ns); + + regmap_read(rcg->clkr.regmap, md_reg, &md); + md = mn_to_md(mn, f->m, f->n, md); + regmap_write(rcg->clkr.regmap, md_reg, md); + + ns = mn_to_ns(mn, f->m, f->n, ns); + regmap_write(rcg->clkr.regmap, rcg->ns_reg, ns); + + ctl = mn_to_reg(mn, f->m, f->n, ctl); + regmap_write(rcg->clkr.regmap, rcg->clkr.enable_reg, ctl); + + ns &= ~BIT(mn->mnctr_reset_bit); + regmap_write(rcg->clkr.regmap, rcg->ns_reg, ns); + } else { + p = &rcg->p[new_bank]; + ns = pre_div_to_ns(p, f->pre_div - 1, ns); + } + + s = &rcg->s[new_bank]; + ns = src_to_ns(s, s->parent_map[f->src], ns); + regmap_write(rcg->clkr.regmap, rcg->ns_reg, ns); + + if (enabled) { + *regp ^= BIT(rcg->mux_sel_bit); + regmap_write(rcg->clkr.regmap, bank_reg, *regp); + } +} + +static int clk_dyn_rcg_set_parent(struct clk_hw *hw, u8 index) +{ + struct clk_dyn_rcg *rcg = to_clk_dyn_rcg(hw); + u32 ns, ctl, md, reg; + int bank; + struct freq_tbl f = { 0 }; + bool banked_mn = !!rcg->mn[1].width; + + regmap_read(rcg->clkr.regmap, rcg->ns_reg, &ns); + regmap_read(rcg->clkr.regmap, rcg->clkr.enable_reg, &ctl); + reg = banked_mn ? ctl : ns; + + bank = reg_to_bank(rcg, reg); + + if (banked_mn) { + regmap_read(rcg->clkr.regmap, rcg->md_reg[bank], &md); + f.m = md_to_m(&rcg->mn[bank], md); + f.n = ns_m_to_n(&rcg->mn[bank], ns, f.m); + } else { + f.pre_div = ns_to_pre_div(&rcg->p[bank], ns) + 1; + } + f.src = index; + + configure_bank(rcg, &f); + + return 0; +} + +/* + * Calculate m/n:d rate + * + * parent_rate m + * rate = ----------- x --- + * pre_div n + */ +static unsigned long +calc_rate(unsigned long rate, u32 m, u32 n, u32 mode, u32 pre_div) +{ + if (pre_div) + rate /= pre_div + 1; + + if (mode) { + u64 tmp = rate; + tmp *= m; + do_div(tmp, n); + rate = tmp; + } + + return rate; +} + +static unsigned long +clk_rcg_recalc_rate(struct clk_hw *hw, unsigned long parent_rate) +{ + struct clk_rcg *rcg = to_clk_rcg(hw); + u32 pre_div, m = 0, n = 0, ns, md, mode = 0; + struct mn *mn = &rcg->mn; + + regmap_read(rcg->clkr.regmap, rcg->ns_reg, &ns); + pre_div = ns_to_pre_div(&rcg->p, ns); + + if (rcg->mn.width) { + regmap_read(rcg->clkr.regmap, rcg->md_reg, &md); + m = md_to_m(mn, md); + n = ns_m_to_n(mn, ns, m); + /* 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, &mode); + else + mode = ns; + mode = reg_to_mnctr_mode(mn, mode); + } + + return calc_rate(parent_rate, m, n, mode, pre_div); +} + +static unsigned long +clk_dyn_rcg_recalc_rate(struct clk_hw *hw, unsigned long parent_rate) +{ + struct clk_dyn_rcg *rcg = to_clk_dyn_rcg(hw); + u32 m, n, pre_div, ns, md, mode, reg; + int bank; + struct mn *mn; + bool banked_mn = !!rcg->mn[1].width; + + regmap_read(rcg->clkr.regmap, rcg->ns_reg, &ns); + + if (banked_mn) + regmap_read(rcg->clkr.regmap, rcg->clkr.enable_reg, ®); + else + reg = ns; + + bank = reg_to_bank(rcg, reg); + + if (banked_mn) { + mn = &rcg->mn[bank]; + regmap_read(rcg->clkr.regmap, rcg->md_reg[bank], &md); + m = md_to_m(mn, md); + n = ns_m_to_n(mn, ns, m); + mode = reg_to_mnctr_mode(mn, reg); + return calc_rate(parent_rate, m, n, mode, 0); + } else { + pre_div = ns_to_pre_div(&rcg->p[bank], ns); + return calc_rate(parent_rate, 0, 0, 0, pre_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) { + rate = rate * f->pre_div; + 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_rcg_determine_rate(struct clk_hw *hw, unsigned long rate, + unsigned long *p_rate, struct clk **p) +{ + struct clk_rcg *rcg = to_clk_rcg(hw); + + return _freq_tbl_determine_rate(hw, rcg->freq_tbl, rate, p_rate, p); +} + +static long clk_dyn_rcg_determine_rate(struct clk_hw *hw, unsigned long rate, + unsigned long *p_rate, struct clk **p) +{ + struct clk_dyn_rcg *rcg = to_clk_dyn_rcg(hw); + + return _freq_tbl_determine_rate(hw, rcg->freq_tbl, rate, p_rate, p); +} + +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; + u32 ns, md, ctl; + struct mn *mn = &rcg->mn; + u32 mask = 0; + unsigned int reset_reg; + + f = find_freq(rcg->freq_tbl, rate); + if (!f) + return -EINVAL; + + if (rcg->mn.reset_in_cc) + reset_reg = rcg->clkr.enable_reg; + else + reset_reg = rcg->ns_reg; + + if (rcg->mn.width) { + 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_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); diff --git a/drivers/clk/qcom/clk-rcg.h b/drivers/clk/qcom/clk-rcg.h new file mode 100644 index 000000000000..1d6b6dece328 --- /dev/null +++ b/drivers/clk/qcom/clk-rcg.h @@ -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 diff --git a/drivers/clk/qcom/clk-rcg2.c b/drivers/clk/qcom/clk-rcg2.c new file mode 100644 index 000000000000..00f878a04d3f --- /dev/null +++ b/drivers/clk/qcom/clk-rcg2.c @@ -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); |