From mboxrd@z Thu Jan 1 00:00:00 1970 From: maxime.ripard@free-electrons.com (Maxime Ripard) Date: Sun, 8 May 2016 22:01:49 +0200 Subject: [PATCH 14/16] clk: sunxi-ng: Add N-K-M-P factor clock In-Reply-To: <1462737711-10017-1-git-send-email-maxime.ripard@free-electrons.com> References: <1462737711-10017-1-git-send-email-maxime.ripard@free-electrons.com> Message-ID: <1462737711-10017-15-git-send-email-maxime.ripard@free-electrons.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Introduce support for clocks that use a combination of two linear multipliers (N and K factors), one linear divider (M) and one power of two divider (P). Signed-off-by: Maxime Ripard --- drivers/clk/sunxi-ng/Makefile | 1 + drivers/clk/sunxi-ng/ccu_nkmp.c | 157 ++++++++++++++++++++++++++++++++++++++++ drivers/clk/sunxi-ng/ccu_nkmp.h | 43 +++++++++++ 3 files changed, 201 insertions(+) create mode 100644 drivers/clk/sunxi-ng/ccu_nkmp.c create mode 100644 drivers/clk/sunxi-ng/ccu_nkmp.h diff --git a/drivers/clk/sunxi-ng/Makefile b/drivers/clk/sunxi-ng/Makefile index 2bb8bc22e907..c794f57b6fb1 100644 --- a/drivers/clk/sunxi-ng/Makefile +++ b/drivers/clk/sunxi-ng/Makefile @@ -9,6 +9,7 @@ obj-y += ccu_mp.o obj-y += ccu_mux.o obj-y += ccu_nk.o obj-y += ccu_nkm.o +obj-y += ccu_nkmp.o obj-y += ccu_nm.o obj-y += ccu_p.o obj-y += ccu_phase.o diff --git a/drivers/clk/sunxi-ng/ccu_nkmp.c b/drivers/clk/sunxi-ng/ccu_nkmp.c new file mode 100644 index 000000000000..b7da00773cd6 --- /dev/null +++ b/drivers/clk/sunxi-ng/ccu_nkmp.c @@ -0,0 +1,157 @@ +/* + * Copyright (C) 2016 Maxime Ripard + * Maxime Ripard + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + */ + +#include +#include + +#include "ccu_gate.h" +#include "ccu_nkmp.h" + +void ccu_nkmp_find_best(unsigned long parent, unsigned long rate, + unsigned long max_n, unsigned long max_k, + unsigned long max_m, unsigned long max_p, + unsigned long *n, unsigned long *k, + unsigned long *m, unsigned long *p) +{ + unsigned long best_rate = 0; + unsigned long best_n = 0, best_k = 0, best_m = 0, best_p = 0; + unsigned long _n, _k, _m, _p; + + for (_k = 1; _k <= max_k; _k++) { + for (_p = 0; _p <= max_p; _p++) { + unsigned long tmp_rate; + + rational_best_approximation(rate / _k, parent << _p, + max_n, max_m, &_n, &_m); + + tmp_rate = (parent * _n * _k >> _p) / _m; + + if (tmp_rate > rate) + continue; + + if ((rate - tmp_rate) < (rate - best_rate)) { + best_rate = tmp_rate; + best_n = _n; + best_k = _k; + best_m = _m; + best_p = _p; + } + } + } + + *n = best_n; + *k = best_k; + *m = best_m; + *p = best_p; +} + +static void ccu_nkmp_disable(struct clk_hw *hw) +{ + struct ccu_nkmp *nkmp = hw_to_ccu_nkmp(hw); + + return ccu_gate_helper_disable(&nkmp->common, nkmp->enable); +} + +static int ccu_nkmp_enable(struct clk_hw *hw) +{ + struct ccu_nkmp *nkmp = hw_to_ccu_nkmp(hw); + + return ccu_gate_helper_enable(&nkmp->common, nkmp->enable); +} + +static int ccu_nkmp_is_enabled(struct clk_hw *hw) +{ + struct ccu_nkmp *nkmp = hw_to_ccu_nkmp(hw); + + return ccu_gate_helper_is_enabled(&nkmp->common, nkmp->enable); +} + +static unsigned long ccu_nkmp_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct ccu_nkmp *nkmp = hw_to_ccu_nkmp(hw); + unsigned long n, m, k, p; + u32 reg; + + reg = readl(nkmp->common.base + nkmp->common.reg); + + n = reg >> nkmp->n.shift; + n &= (1 << nkmp->n.width) - 1; + + k = reg >> nkmp->k.shift; + k &= (1 << nkmp->k.width) - 1; + + m = reg >> nkmp->m.shift; + m &= (1 << nkmp->m.width) - 1; + + p = reg >> nkmp->p.shift; + p &= (1 << nkmp->p.width) - 1; + + return (parent_rate * (n + 1) * (k + 1) >> p) / (m + 1); +} + +static long ccu_nkmp_round_rate(struct clk_hw *hw, unsigned long rate, + unsigned long *parent_rate) +{ + struct ccu_nkmp *nkmp = hw_to_ccu_nkmp(hw); + unsigned long n, k, m, p; + + ccu_nkmp_find_best(*parent_rate, rate, + 1 << nkmp->n.width, 1 << nkmp->k.width, + 1 << nkmp->m.width, (1 << nkmp->p.width) - 1, + &n, &k, &m, &p); + + return (*parent_rate * n * k >> p) / m; +} + +static int ccu_nkmp_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) +{ + struct ccu_nkmp *nkmp = hw_to_ccu_nkmp(hw); + unsigned long n, k, m, p; + unsigned long flags; + u32 reg; + + ccu_nkmp_find_best(parent_rate, rate, + 1 << nkmp->n.width, 1 << nkmp->k.width, + 1 << nkmp->m.width, (1 << nkmp->p.width) - 1, + &n, &k, &m, &p); + + spin_lock_irqsave(nkmp->common.lock, flags); + + reg = readl(nkmp->common.base + nkmp->common.reg); + reg &= ~GENMASK(nkmp->n.width + nkmp->n.shift, nkmp->n.shift); + reg &= ~GENMASK(nkmp->k.width + nkmp->k.shift, nkmp->k.shift); + reg &= ~GENMASK(nkmp->m.width + nkmp->m.shift, nkmp->m.shift); + reg &= ~GENMASK(nkmp->p.width + nkmp->p.shift, nkmp->p.shift); + + reg |= (n - 1) << nkmp->m.shift; + reg |= (k - 1) << nkmp->m.shift; + reg |= (m - 1) << nkmp->m.shift; + reg |= p << nkmp->p.shift; + + writel(reg, nkmp->common.base + nkmp->common.reg); + + spin_unlock_irqrestore(nkmp->common.lock, flags); + + ccu_helper_wait_for_lock(&nkmp->common, nkmp->lock); + + return 0; +} + +const struct clk_ops ccu_nkmp_ops = { + .disable = ccu_nkmp_disable, + .enable = ccu_nkmp_enable, + .is_enabled = ccu_nkmp_is_enabled, + + .recalc_rate = ccu_nkmp_recalc_rate, + .round_rate = ccu_nkmp_round_rate, + .set_rate = ccu_nkmp_set_rate, +}; diff --git a/drivers/clk/sunxi-ng/ccu_nkmp.h b/drivers/clk/sunxi-ng/ccu_nkmp.h new file mode 100644 index 000000000000..8a91f2c837a4 --- /dev/null +++ b/drivers/clk/sunxi-ng/ccu_nkmp.h @@ -0,0 +1,43 @@ +/* + * Copyright (c) 2016 Maxime Ripard. 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 _CCU_NKMP_H_ +#define _CCU_NKMP_H_ + +#include + +#include "ccu_factor.h" +#include "ccu_common.h" + +struct ccu_nkmp { + u32 enable; + u32 lock; + + struct ccu_factor n; + struct ccu_factor k; + struct ccu_factor m; + struct ccu_factor p; + + struct ccu_common common; +}; + +static inline struct ccu_nkmp *hw_to_ccu_nkmp(struct clk_hw *hw) +{ + struct ccu_common *common = hw_to_ccu_common(hw); + + return container_of(common, struct ccu_nkmp, common); +} + +extern const struct clk_ops ccu_nkmp_ops; + +#endif /* _CCU_NKMP_H_ */ -- 2.8.2