Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 194 insertions, 0 deletions

diff --git a/drivers/clk/actions/owl-pll.c b/drivers/clk/actions/owl-pll.c
new file mode 100644
index 000000000..058e06d70
--- /dev/null
+++ b/drivers/clk/actions/owl-pll.c
@@ -0,0 +1,194 @@
+// SPDX-License-Identifier: GPL-2.0+
+//
+// OWL pll clock driver
+//
+// Copyright (c) 2014 Actions Semi Inc.
+// Author: David Liu <liuwei@actions-semi.com>
+//
+// Copyright (c) 2018 Linaro Ltd.
+// Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
+
+#include <linux/clk-provider.h>
+#include <linux/slab.h>
+#include <linux/io.h>
+#include <linux/delay.h>
+
+#include "owl-pll.h"
+
+static u32 owl_pll_calculate_mul(struct owl_pll_hw *pll_hw, unsigned long rate)
+{
+	u32 mul;
+
+	mul = DIV_ROUND_CLOSEST(rate, pll_hw->bfreq);
+	if (mul < pll_hw->min_mul)
+		mul = pll_hw->min_mul;
+	else if (mul > pll_hw->max_mul)
+		mul = pll_hw->max_mul;
+
+	return mul &= mul_mask(pll_hw);
+}
+
+static unsigned long _get_table_rate(const struct clk_pll_table *table,
+		unsigned int val)
+{
+	const struct clk_pll_table *clkt;
+
+	for (clkt = table; clkt->rate; clkt++)
+		if (clkt->val == val)
+			return clkt->rate;
+
+	return 0;
+}
+
+static const struct clk_pll_table *_get_pll_table(
+		const struct clk_pll_table *table, unsigned long rate)
+{
+	const struct clk_pll_table *clkt;
+
+	for (clkt = table; clkt->rate; clkt++) {
+		if (clkt->rate == rate) {
+			table = clkt;
+			break;
+		} else if (clkt->rate < rate)
+			table = clkt;
+	}
+
+	return table;
+}
+
+static long owl_pll_round_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long *parent_rate)
+{
+	struct owl_pll *pll = hw_to_owl_pll(hw);
+	struct owl_pll_hw *pll_hw = &pll->pll_hw;
+	const struct clk_pll_table *clkt;
+	u32 mul;
+
+	if (pll_hw->table) {
+		clkt = _get_pll_table(pll_hw->table, rate);
+		return clkt->rate;
+	}
+
+	/* fixed frequency */
+	if (pll_hw->width == 0)
+		return pll_hw->bfreq;
+
+	mul = owl_pll_calculate_mul(pll_hw, rate);
+
+	return pll_hw->bfreq * mul;
+}
+
+static unsigned long owl_pll_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct owl_pll *pll = hw_to_owl_pll(hw);
+	struct owl_pll_hw *pll_hw = &pll->pll_hw;
+	const struct owl_clk_common *common = &pll->common;
+	u32 val;
+
+	if (pll_hw->table) {
+		regmap_read(common->regmap, pll_hw->reg, &val);
+
+		val = val >> pll_hw->shift;
+		val &= mul_mask(pll_hw);
+
+		return _get_table_rate(pll_hw->table, val);
+	}
+
+	/* fixed frequency */
+	if (pll_hw->width == 0)
+		return pll_hw->bfreq;
+
+	regmap_read(common->regmap, pll_hw->reg, &val);
+
+	val = val >> pll_hw->shift;
+	val &= mul_mask(pll_hw);
+
+	return pll_hw->bfreq * val;
+}
+
+static int owl_pll_is_enabled(struct clk_hw *hw)
+{
+	struct owl_pll *pll = hw_to_owl_pll(hw);
+	struct owl_pll_hw *pll_hw = &pll->pll_hw;
+	const struct owl_clk_common *common = &pll->common;
+	u32 reg;
+
+	regmap_read(common->regmap, pll_hw->reg, &reg);
+
+	return !!(reg & BIT(pll_hw->bit_idx));
+}
+
+static void owl_pll_set(const struct owl_clk_common *common,
+		       const struct owl_pll_hw *pll_hw, bool enable)
+{
+	u32 reg;
+
+	regmap_read(common->regmap, pll_hw->reg, &reg);
+
+	if (enable)
+		reg |= BIT(pll_hw->bit_idx);
+	else
+		reg &= ~BIT(pll_hw->bit_idx);
+
+	regmap_write(common->regmap, pll_hw->reg, reg);
+}
+
+static int owl_pll_enable(struct clk_hw *hw)
+{
+	struct owl_pll *pll = hw_to_owl_pll(hw);
+	const struct owl_clk_common *common = &pll->common;
+
+	owl_pll_set(common, &pll->pll_hw, true);
+
+	return 0;
+}
+
+static void owl_pll_disable(struct clk_hw *hw)
+{
+	struct owl_pll *pll = hw_to_owl_pll(hw);
+	const struct owl_clk_common *common = &pll->common;
+
+	owl_pll_set(common, &pll->pll_hw, false);
+}
+
+static int owl_pll_set_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long parent_rate)
+{
+	struct owl_pll *pll = hw_to_owl_pll(hw);
+	struct owl_pll_hw *pll_hw = &pll->pll_hw;
+	const struct owl_clk_common *common = &pll->common;
+	const struct clk_pll_table *clkt;
+	u32 val, reg;
+
+	/* fixed frequency */
+	if (pll_hw->width == 0)
+		return 0;
+
+	if (pll_hw->table) {
+		clkt = _get_pll_table(pll_hw->table, rate);
+		val = clkt->val;
+	} else {
+		val = owl_pll_calculate_mul(pll_hw, rate);
+	}
+
+	regmap_read(common->regmap, pll_hw->reg, &reg);
+
+	reg &= ~mul_mask(pll_hw);
+	reg |= val << pll_hw->shift;
+
+	regmap_write(common->regmap, pll_hw->reg, reg);
+
+	udelay(PLL_STABILITY_WAIT_US);
+
+	return 0;
+}
+
+const struct clk_ops owl_pll_ops = {
+	.enable = owl_pll_enable,
+	.disable = owl_pll_disable,
+	.is_enabled = owl_pll_is_enabled,
+	.round_rate = owl_pll_round_rate,
+	.recalc_rate = owl_pll_recalc_rate,
+	.set_rate = owl_pll_set_rate,
+};