1 files changed, 222 insertions, 0 deletions

diff --git a/drivers/clk/sunxi-ng/ccu_nkmp.c b/drivers/clk/sunxi-ng/ccu_nkmp.c
new file mode 100644
index 000000000..1ad53d101
--- /dev/null
+++ b/drivers/clk/sunxi-ng/ccu_nkmp.c
@@ -0,0 +1,222 @@
+/*
+ * Copyright (C) 2016 Maxime Ripard
+ * Maxime Ripard <maxime.ripard@free-electrons.com>
+ *
+ * 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 <linux/clk-provider.h>
+
+#include "ccu_gate.h"
+#include "ccu_nkmp.h"
+
+struct _ccu_nkmp {
+	unsigned long	n, min_n, max_n;
+	unsigned long	k, min_k, max_k;
+	unsigned long	m, min_m, max_m;
+	unsigned long	p, min_p, max_p;
+};
+
+static unsigned long ccu_nkmp_calc_rate(unsigned long parent,
+					unsigned long n, unsigned long k,
+					unsigned long m, unsigned long p)
+{
+	u64 rate = parent;
+
+	rate *= n * k;
+	do_div(rate, m * p);
+
+	return rate;
+}
+
+static void ccu_nkmp_find_best(unsigned long parent, unsigned long rate,
+			       struct _ccu_nkmp *nkmp)
+{
+	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 = nkmp->min_k; _k <= nkmp->max_k; _k++) {
+		for (_n = nkmp->min_n; _n <= nkmp->max_n; _n++) {
+			for (_m = nkmp->min_m; _m <= nkmp->max_m; _m++) {
+				for (_p = nkmp->min_p; _p <= nkmp->max_p; _p <<= 1) {
+					unsigned long tmp_rate;
+
+					tmp_rate = ccu_nkmp_calc_rate(parent,
+								      _n, _k,
+								      _m, _p);
+
+					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;
+					}
+				}
+			}
+		}
+	}
+
+	nkmp->n = best_n;
+	nkmp->k = best_k;
+	nkmp->m = best_m;
+	nkmp->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, rate;
+	u32 reg;
+
+	reg = readl(nkmp->common.base + nkmp->common.reg);
+
+	n = reg >> nkmp->n.shift;
+	n &= (1 << nkmp->n.width) - 1;
+	n += nkmp->n.offset;
+	if (!n)
+		n++;
+
+	k = reg >> nkmp->k.shift;
+	k &= (1 << nkmp->k.width) - 1;
+	k += nkmp->k.offset;
+	if (!k)
+		k++;
+
+	m = reg >> nkmp->m.shift;
+	m &= (1 << nkmp->m.width) - 1;
+	m += nkmp->m.offset;
+	if (!m)
+		m++;
+
+	p = reg >> nkmp->p.shift;
+	p &= (1 << nkmp->p.width) - 1;
+
+	rate = ccu_nkmp_calc_rate(parent_rate, n, k, m, 1 << p);
+	if (nkmp->common.features & CCU_FEATURE_FIXED_POSTDIV)
+		rate /= nkmp->fixed_post_div;
+
+	return rate;
+}
+
+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);
+	struct _ccu_nkmp _nkmp;
+
+	if (nkmp->common.features & CCU_FEATURE_FIXED_POSTDIV)
+		rate *= nkmp->fixed_post_div;
+
+	_nkmp.min_n = nkmp->n.min ?: 1;
+	_nkmp.max_n = nkmp->n.max ?: 1 << nkmp->n.width;
+	_nkmp.min_k = nkmp->k.min ?: 1;
+	_nkmp.max_k = nkmp->k.max ?: 1 << nkmp->k.width;
+	_nkmp.min_m = 1;
+	_nkmp.max_m = nkmp->m.max ?: 1 << nkmp->m.width;
+	_nkmp.min_p = 1;
+	_nkmp.max_p = nkmp->p.max ?: 1 << ((1 << nkmp->p.width) - 1);
+
+	ccu_nkmp_find_best(*parent_rate, rate, &_nkmp);
+
+	rate = ccu_nkmp_calc_rate(*parent_rate, _nkmp.n, _nkmp.k,
+				  _nkmp.m, _nkmp.p);
+	if (nkmp->common.features & CCU_FEATURE_FIXED_POSTDIV)
+		rate = rate / nkmp->fixed_post_div;
+
+	return rate;
+}
+
+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);
+	u32 n_mask = 0, k_mask = 0, m_mask = 0, p_mask = 0;
+	struct _ccu_nkmp _nkmp;
+	unsigned long flags;
+	u32 reg;
+
+	if (nkmp->common.features & CCU_FEATURE_FIXED_POSTDIV)
+		rate = rate * nkmp->fixed_post_div;
+
+	_nkmp.min_n = nkmp->n.min ?: 1;
+	_nkmp.max_n = nkmp->n.max ?: 1 << nkmp->n.width;
+	_nkmp.min_k = nkmp->k.min ?: 1;
+	_nkmp.max_k = nkmp->k.max ?: 1 << nkmp->k.width;
+	_nkmp.min_m = 1;
+	_nkmp.max_m = nkmp->m.max ?: 1 << nkmp->m.width;
+	_nkmp.min_p = 1;
+	_nkmp.max_p = nkmp->p.max ?: 1 << ((1 << nkmp->p.width) - 1);
+
+	ccu_nkmp_find_best(parent_rate, rate, &_nkmp);
+
+	if (nkmp->n.width)
+		n_mask = GENMASK(nkmp->n.width + nkmp->n.shift - 1,
+				 nkmp->n.shift);
+	if (nkmp->k.width)
+		k_mask = GENMASK(nkmp->k.width + nkmp->k.shift - 1,
+				 nkmp->k.shift);
+	if (nkmp->m.width)
+		m_mask = GENMASK(nkmp->m.width + nkmp->m.shift - 1,
+				 nkmp->m.shift);
+	if (nkmp->p.width)
+		p_mask = GENMASK(nkmp->p.width + nkmp->p.shift - 1,
+				 nkmp->p.shift);
+
+	spin_lock_irqsave(nkmp->common.lock, flags);
+
+	reg = readl(nkmp->common.base + nkmp->common.reg);
+	reg &= ~(n_mask | k_mask | m_mask | p_mask);
+
+	reg |= ((_nkmp.n - nkmp->n.offset) << nkmp->n.shift) & n_mask;
+	reg |= ((_nkmp.k - nkmp->k.offset) << nkmp->k.shift) & k_mask;
+	reg |= ((_nkmp.m - nkmp->m.offset) << nkmp->m.shift) & m_mask;
+	reg |= (ilog2(_nkmp.p) << nkmp->p.shift) & p_mask;
+
+	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,
+};