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openwrtv3/target/linux/mediatek/patches/0002-clk-mediatek-Add-initial-common-clock-support-for-Me.patch

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mediatek: add support for the new MT7623 Arm SoC the support is still WIP. next steps are to make the pmic and ethernet work. this is the first commit to make sure nothing gets lost. Signed-off-by: John Crispin <blogic@openwrt.org> SVN-Revision: 47354
2015-11-02 10:18:50 +00:00
From f851b4ea6cae9fd5875036b6d3968375882ce56b Mon Sep 17 00:00:00 2001
From: James Liao <jamesjj.liao@mediatek.com>
Date: Thu, 23 Apr 2015 10:35:39 +0200
Subject: [PATCH 02/76] clk: mediatek: Add initial common clock support for
Mediatek SoCs.
This patch adds common clock support for Mediatek SoCs, including plls,
muxes and clock gates.
Signed-off-by: James Liao <jamesjj.liao@mediatek.com>
Signed-off-by: Henry Chen <henryc.chen@mediatek.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
drivers/clk/Makefile | 1 +
drivers/clk/mediatek/Makefile | 1 +
drivers/clk/mediatek/clk-gate.c | 137 ++++++++++++++++
drivers/clk/mediatek/clk-gate.h | 49 ++++++
drivers/clk/mediatek/clk-mtk.c | 220 ++++++++++++++++++++++++++
drivers/clk/mediatek/clk-mtk.h | 159 +++++++++++++++++++
drivers/clk/mediatek/clk-pll.c | 332 +++++++++++++++++++++++++++++++++++++++
7 files changed, 899 insertions(+)
create mode 100644 drivers/clk/mediatek/Makefile
create mode 100644 drivers/clk/mediatek/clk-gate.c
create mode 100644 drivers/clk/mediatek/clk-gate.h
create mode 100644 drivers/clk/mediatek/clk-mtk.c
create mode 100644 drivers/clk/mediatek/clk-mtk.h
create mode 100644 drivers/clk/mediatek/clk-pll.c
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -51,6 +51,7 @@ obj-$(CONFIG_ARCH_HI3xxx) += hisilicon/
obj-$(CONFIG_ARCH_HIP04) += hisilicon/
obj-$(CONFIG_ARCH_HIX5HD2) += hisilicon/
obj-$(CONFIG_COMMON_CLK_KEYSTONE) += keystone/
+obj-$(CONFIG_ARCH_MEDIATEK) += mediatek/
ifeq ($(CONFIG_COMMON_CLK), y)
obj-$(CONFIG_ARCH_MMP) += mmp/
endif
--- /dev/null
+++ b/drivers/clk/mediatek/Makefile
@@ -0,0 +1 @@
+obj-y += clk-mtk.o clk-pll.o clk-gate.o
--- /dev/null
+++ b/drivers/clk/mediatek/clk-gate.c
@@ -0,0 +1,137 @@
+/*
+ * Copyright (c) 2014 MediaTek Inc.
+ * Author: James Liao <jamesjj.liao@mediatek.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 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/of.h>
+#include <linux/of_address.h>
+
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/clkdev.h>
+
+#include "clk-mtk.h"
+#include "clk-gate.h"
+
+static int mtk_cg_bit_is_cleared(struct clk_hw *hw)
+{
+ struct mtk_clk_gate *cg = to_clk_gate(hw);
+ u32 val;
+
+ regmap_read(cg->regmap, cg->sta_ofs, &val);
+
+ val &= BIT(cg->bit);
+
+ return val == 0;
+}
+
+static int mtk_cg_bit_is_set(struct clk_hw *hw)
+{
+ struct mtk_clk_gate *cg = to_clk_gate(hw);
+ u32 val;
+
+ regmap_read(cg->regmap, cg->sta_ofs, &val);
+
+ val &= BIT(cg->bit);
+
+ return val != 0;
+}
+
+static void mtk_cg_set_bit(struct clk_hw *hw)
+{
+ struct mtk_clk_gate *cg = to_clk_gate(hw);
+
+ regmap_write(cg->regmap, cg->set_ofs, BIT(cg->bit));
+}
+
+static void mtk_cg_clr_bit(struct clk_hw *hw)
+{
+ struct mtk_clk_gate *cg = to_clk_gate(hw);
+
+ regmap_write(cg->regmap, cg->clr_ofs, BIT(cg->bit));
+}
+
+static int mtk_cg_enable(struct clk_hw *hw)
+{
+ mtk_cg_clr_bit(hw);
+
+ return 0;
+}
+
+static void mtk_cg_disable(struct clk_hw *hw)
+{
+ mtk_cg_set_bit(hw);
+}
+
+static int mtk_cg_enable_inv(struct clk_hw *hw)
+{
+ mtk_cg_set_bit(hw);
+
+ return 0;
+}
+
+static void mtk_cg_disable_inv(struct clk_hw *hw)
+{
+ mtk_cg_clr_bit(hw);
+}
+
+const struct clk_ops mtk_clk_gate_ops_setclr = {
+ .is_enabled = mtk_cg_bit_is_cleared,
+ .enable = mtk_cg_enable,
+ .disable = mtk_cg_disable,
+};
+
+const struct clk_ops mtk_clk_gate_ops_setclr_inv = {
+ .is_enabled = mtk_cg_bit_is_set,
+ .enable = mtk_cg_enable_inv,
+ .disable = mtk_cg_disable_inv,
+};
+
+struct clk *mtk_clk_register_gate(
+ const char *name,
+ const char *parent_name,
+ struct regmap *regmap,
+ int set_ofs,
+ int clr_ofs,
+ int sta_ofs,
+ u8 bit,
+ const struct clk_ops *ops)
+{
+ struct mtk_clk_gate *cg;
+ struct clk *clk;
+ struct clk_init_data init;
+
+ cg = kzalloc(sizeof(*cg), GFP_KERNEL);
+ if (!cg)
+ return ERR_PTR(-ENOMEM);
+
+ init.name = name;
+ init.flags = CLK_SET_RATE_PARENT;
+ init.parent_names = parent_name ? &parent_name : NULL;
+ init.num_parents = parent_name ? 1 : 0;
+ init.ops = ops;
+
+ cg->regmap = regmap;
+ cg->set_ofs = set_ofs;
+ cg->clr_ofs = clr_ofs;
+ cg->sta_ofs = sta_ofs;
+ cg->bit = bit;
+
+ cg->hw.init = &init;
+
+ clk = clk_register(NULL, &cg->hw);
+ if (IS_ERR(clk))
+ kfree(cg);
+
+ return clk;
+}
--- /dev/null
+++ b/drivers/clk/mediatek/clk-gate.h
@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2014 MediaTek Inc.
+ * Author: James Liao <jamesjj.liao@mediatek.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 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 __DRV_CLK_GATE_H
+#define __DRV_CLK_GATE_H
+
+#include <linux/regmap.h>
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+
+struct mtk_clk_gate {
+ struct clk_hw hw;
+ struct regmap *regmap;
+ int set_ofs;
+ int clr_ofs;
+ int sta_ofs;
+ u8 bit;
+};
+
+static inline struct mtk_clk_gate *to_clk_gate(struct clk_hw *hw)
+{
+ return container_of(hw, struct mtk_clk_gate, hw);
+}
+
+extern const struct clk_ops mtk_clk_gate_ops_setclr;
+extern const struct clk_ops mtk_clk_gate_ops_setclr_inv;
+
+struct clk *mtk_clk_register_gate(
+ const char *name,
+ const char *parent_name,
+ struct regmap *regmap,
+ int set_ofs,
+ int clr_ofs,
+ int sta_ofs,
+ u8 bit,
+ const struct clk_ops *ops);
+
+#endif /* __DRV_CLK_GATE_H */
--- /dev/null
+++ b/drivers/clk/mediatek/clk-mtk.c
@@ -0,0 +1,220 @@
+/*
+ * Copyright (c) 2014 MediaTek Inc.
+ * Author: James Liao <jamesjj.liao@mediatek.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 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/of.h>
+#include <linux/of_address.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/clkdev.h>
+#include <linux/mfd/syscon.h>
+
+#include "clk-mtk.h"
+#include "clk-gate.h"
+
+struct clk_onecell_data *mtk_alloc_clk_data(unsigned int clk_num)
+{
+ int i;
+ struct clk_onecell_data *clk_data;
+
+ clk_data = kzalloc(sizeof(*clk_data), GFP_KERNEL);
+ if (!clk_data)
+ return NULL;
+
+ clk_data->clks = kcalloc(clk_num, sizeof(*clk_data->clks), GFP_KERNEL);
+ if (!clk_data->clks)
+ goto err_out;
+
+ clk_data->clk_num = clk_num;
+
+ for (i = 0; i < clk_num; i++)
+ clk_data->clks[i] = ERR_PTR(-ENOENT);
+
+ return clk_data;
+err_out:
+ kfree(clk_data);
+
+ return NULL;
+}
+
+void mtk_clk_register_factors(const struct mtk_fixed_factor *clks, int num,
+ struct clk_onecell_data *clk_data)
+{
+ int i;
+ struct clk *clk;
+
+ for (i = 0; i < num; i++) {
+ const struct mtk_fixed_factor *ff = &clks[i];
+
+ clk = clk_register_fixed_factor(NULL, ff->name, ff->parent_name,
+ CLK_SET_RATE_PARENT, ff->mult, ff->div);
+
+ if (IS_ERR(clk)) {
+ pr_err("Failed to register clk %s: %ld\n",
+ ff->name, PTR_ERR(clk));
+ continue;
+ }
+
+ if (clk_data)
+ clk_data->clks[ff->id] = clk;
+ }
+}
+
+int mtk_clk_register_gates(struct device_node *node, const struct mtk_gate *clks,
+ int num, struct clk_onecell_data *clk_data)
+{
+ int i;
+ struct clk *clk;
+ struct regmap *regmap;
+
+ if (!clk_data)
+ return -ENOMEM;
+
+ regmap = syscon_node_to_regmap(node);
+ if (IS_ERR(regmap)) {
+ pr_err("Cannot find regmap for %s: %ld\n", node->full_name,
+ PTR_ERR(regmap));
+ return PTR_ERR(regmap);
+ }
+
+ for (i = 0; i < num; i++) {
+ const struct mtk_gate *gate = &clks[i];
+
+ clk = mtk_clk_register_gate(gate->name, gate->parent_name,
+ regmap,
+ gate->regs->set_ofs,
+ gate->regs->clr_ofs,
+ gate->regs->sta_ofs,
+ gate->shift, gate->ops);
+
+ if (IS_ERR(clk)) {
+ pr_err("Failed to register clk %s: %ld\n",
+ gate->name, PTR_ERR(clk));
+ continue;
+ }
+
+ clk_data->clks[gate->id] = clk;
+ }
+
+ return 0;
+}
+
+struct clk *mtk_clk_register_composite(const struct mtk_composite *mc,
+ void __iomem *base, spinlock_t *lock)
+{
+ struct clk *clk;
+ struct clk_mux *mux = NULL;
+ struct clk_gate *gate = NULL;
+ struct clk_divider *div = NULL;
+ struct clk_hw *mux_hw = NULL, *gate_hw = NULL, *div_hw = NULL;
+ const struct clk_ops *mux_ops = NULL, *gate_ops = NULL, *div_ops = NULL;
+ const char * const *parent_names;
+ const char *parent;
+ int num_parents;
+ int ret;
+
+ if (mc->mux_shift >= 0) {
+ mux = kzalloc(sizeof(*mux), GFP_KERNEL);
+ if (!mux)
+ return ERR_PTR(-ENOMEM);
+
+ mux->reg = base + mc->mux_reg;
+ mux->mask = BIT(mc->mux_width) - 1;
+ mux->shift = mc->mux_shift;
+ mux->lock = lock;
+
+ mux_hw = &mux->hw;
+ mux_ops = &clk_mux_ops;
+
+ parent_names = mc->parent_names;
+ num_parents = mc->num_parents;
+ } else {
+ parent = mc->parent;
+ parent_names = &parent;
+ num_parents = 1;
+ }
+
+ if (mc->gate_shift >= 0) {
+ gate = kzalloc(sizeof(*gate), GFP_KERNEL);
+ if (!gate) {
+ ret = -ENOMEM;
+ goto err_out;
+ }
+
+ gate->reg = base + mc->gate_reg;
+ gate->bit_idx = mc->gate_shift;
+ gate->flags = CLK_GATE_SET_TO_DISABLE;
+ gate->lock = lock;
+
+ gate_hw = &gate->hw;
+ gate_ops = &clk_gate_ops;
+ }
+
+ if (mc->divider_shift >= 0) {
+ div = kzalloc(sizeof(*div), GFP_KERNEL);
+ if (!div) {
+ ret = -ENOMEM;
+ goto err_out;
+ }
+
+ div->reg = base + mc->divider_reg;
+ div->shift = mc->divider_shift;
+ div->width = mc->divider_width;
+ div->lock = lock;
+
+ div_hw = &div->hw;
+ div_ops = &clk_divider_ops;
+ }
+
+ clk = clk_register_composite(NULL, mc->name, parent_names, num_parents,
+ mux_hw, mux_ops,
+ div_hw, div_ops,
+ gate_hw, gate_ops,
+ mc->flags);
+
+ if (IS_ERR(clk)) {
+ kfree(gate);
+ kfree(mux);
+ }
+
+ return clk;
+err_out:
+ kfree(mux);
+
+ return ERR_PTR(ret);
+}
+
+void mtk_clk_register_composites(const struct mtk_composite *mcs,
+ int num, void __iomem *base, spinlock_t *lock,
+ struct clk_onecell_data *clk_data)
+{
+ struct clk *clk;
+ int i;
+
+ for (i = 0; i < num; i++) {
+ const struct mtk_composite *mc = &mcs[i];
+
+ clk = mtk_clk_register_composite(mc, base, lock);
+
+ if (IS_ERR(clk)) {
+ pr_err("Failed to register clk %s: %ld\n",
+ mc->name, PTR_ERR(clk));
+ continue;
+ }
+
+ if (clk_data)
+ clk_data->clks[mc->id] = clk;
+ }
+}
--- /dev/null
+++ b/drivers/clk/mediatek/clk-mtk.h
@@ -0,0 +1,159 @@
+/*
+ * Copyright (c) 2014 MediaTek Inc.
+ * Author: James Liao <jamesjj.liao@mediatek.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 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 __DRV_CLK_MTK_H
+#define __DRV_CLK_MTK_H
+
+#include <linux/regmap.h>
+#include <linux/bitops.h>
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+
+#define MAX_MUX_GATE_BIT 31
+#define INVALID_MUX_GATE_BIT (MAX_MUX_GATE_BIT + 1)
+
+#define MHZ (1000 * 1000)
+
+struct mtk_fixed_factor {
+ int id;
+ const char *name;
+ const char *parent_name;
+ int mult;
+ int div;
+};
+
+#define FACTOR(_id, _name, _parent, _mult, _div) { \
+ .id = _id, \
+ .name = _name, \
+ .parent_name = _parent, \
+ .mult = _mult, \
+ .div = _div, \
+ }
+
+extern void mtk_clk_register_factors(const struct mtk_fixed_factor *clks,
+ int num, struct clk_onecell_data *clk_data);
+
+struct mtk_composite {
+ int id;
+ const char *name;
+ const char * const * parent_names;
+ const char *parent;
+ unsigned flags;
+
+ uint32_t mux_reg;
+ uint32_t divider_reg;
+ uint32_t gate_reg;
+
+ signed char mux_shift;
+ signed char mux_width;
+ signed char gate_shift;
+
+ signed char divider_shift;
+ signed char divider_width;
+
+ signed char num_parents;
+};
+
+#define MUX_GATE(_id, _name, _parents, _reg, _shift, _width, _gate) { \
+ .id = _id, \
+ .name = _name, \
+ .mux_reg = _reg, \
+ .mux_shift = _shift, \
+ .mux_width = _width, \
+ .gate_reg = _reg, \
+ .gate_shift = _gate, \
+ .divider_shift = -1, \
+ .parent_names = _parents, \
+ .num_parents = ARRAY_SIZE(_parents), \
+ .flags = CLK_SET_RATE_PARENT, \
+ }
+
+#define MUX(_id, _name, _parents, _reg, _shift, _width) { \
+ .id = _id, \
+ .name = _name, \
+ .mux_reg = _reg, \
+ .mux_shift = _shift, \
+ .mux_width = _width, \
+ .gate_shift = -1, \
+ .divider_shift = -1, \
+ .parent_names = _parents, \
+ .num_parents = ARRAY_SIZE(_parents), \
+ .flags = CLK_SET_RATE_PARENT, \
+ }
+
+#define DIV_GATE(_id, _name, _parent, _gate_reg, _gate_shift, _div_reg, _div_width, _div_shift) { \
+ .id = _id, \
+ .parent = _parent, \
+ .name = _name, \
+ .divider_reg = _div_reg, \
+ .divider_shift = _div_shift, \
+ .divider_width = _div_width, \
+ .gate_reg = _gate_reg, \
+ .gate_shift = _gate_shift, \
+ .mux_shift = -1, \
+ .flags = 0, \
+ }
+
+struct clk *mtk_clk_register_composite(const struct mtk_composite *mc,
+ void __iomem *base, spinlock_t *lock);
+
+void mtk_clk_register_composites(const struct mtk_composite *mcs,
+ int num, void __iomem *base, spinlock_t *lock,
+ struct clk_onecell_data *clk_data);
+
+struct mtk_gate_regs {
+ u32 sta_ofs;
+ u32 clr_ofs;
+ u32 set_ofs;
+};
+
+struct mtk_gate {
+ int id;
+ const char *name;
+ const char *parent_name;
+ const struct mtk_gate_regs *regs;
+ int shift;
+ const struct clk_ops *ops;
+};
+
+int mtk_clk_register_gates(struct device_node *node, const struct mtk_gate *clks,
+ int num, struct clk_onecell_data *clk_data);
+
+struct clk_onecell_data *mtk_alloc_clk_data(unsigned int clk_num);
+
+#define HAVE_RST_BAR BIT(0)
+
+struct mtk_pll_data {
+ int id;
+ const char *name;
+ uint32_t reg;
+ uint32_t pwr_reg;
+ uint32_t en_mask;
+ uint32_t pd_reg;
+ uint32_t tuner_reg;
+ int pd_shift;
+ unsigned int flags;
+ const struct clk_ops *ops;
+ u32 rst_bar_mask;
+ unsigned long fmax;
+ int pcwbits;
+ uint32_t pcw_reg;
+ int pcw_shift;
+};
+
+void __init mtk_clk_register_plls(struct device_node *node,
+ const struct mtk_pll_data *plls, int num_plls,
+ struct clk_onecell_data *clk_data);
+
+#endif /* __DRV_CLK_MTK_H */
--- /dev/null
+++ b/drivers/clk/mediatek/clk-pll.c
@@ -0,0 +1,332 @@
+/*
+ * Copyright (c) 2014 MediaTek Inc.
+ * Author: James Liao <jamesjj.liao@mediatek.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 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/of.h>
+#include <linux/of_address.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/clkdev.h>
+#include <linux/delay.h>
+
+#include "clk-mtk.h"
+
+#define REG_CON0 0
+#define REG_CON1 4
+
+#define CON0_BASE_EN BIT(0)
+#define CON0_PWR_ON BIT(0)
+#define CON0_ISO_EN BIT(1)
+#define CON0_PCW_CHG BIT(31)
+
+#define AUDPLL_TUNER_EN BIT(31)
+
+#define POSTDIV_MASK 0x7
+#define INTEGER_BITS 7
+
+/*
+ * MediaTek PLLs are configured through their pcw value. The pcw value describes
+ * a divider in the PLL feedback loop which consists of 7 bits for the integer
+ * part and the remaining bits (if present) for the fractional part. Also they
+ * have a 3 bit power-of-two post divider.
+ */
+
+struct mtk_clk_pll {
+ struct clk_hw hw;
+ void __iomem *base_addr;
+ void __iomem *pd_addr;
+ void __iomem *pwr_addr;
+ void __iomem *tuner_addr;
+ void __iomem *pcw_addr;
+ const struct mtk_pll_data *data;
+};
+
+static inline struct mtk_clk_pll *to_mtk_clk_pll(struct clk_hw *hw)
+{
+ return container_of(hw, struct mtk_clk_pll, hw);
+}
+
+static int mtk_pll_is_prepared(struct clk_hw *hw)
+{
+ struct mtk_clk_pll *pll = to_mtk_clk_pll(hw);
+
+ return (readl(pll->base_addr + REG_CON0) & CON0_BASE_EN) != 0;
+}
+
+static unsigned long __mtk_pll_recalc_rate(struct mtk_clk_pll *pll, u32 fin,
+ u32 pcw, int postdiv)
+{
+ int pcwbits = pll->data->pcwbits;
+ int pcwfbits;
+ u64 vco;
+ u8 c = 0;
+
+ /* The fractional part of the PLL divider. */
+ pcwfbits = pcwbits > INTEGER_BITS ? pcwbits - INTEGER_BITS : 0;
+
+ vco = (u64)fin * pcw;
+
+ if (pcwfbits && (vco & GENMASK(pcwfbits - 1, 0)))
+ c = 1;
+
+ vco >>= pcwfbits;
+
+ if (c)
+ vco++;
+
+ return ((unsigned long)vco + postdiv - 1) / postdiv;
+}
+
+static void mtk_pll_set_rate_regs(struct mtk_clk_pll *pll, u32 pcw,
+ int postdiv)
+{
+ u32 con1, pd, val;
+ int pll_en;
+
+ /* set postdiv */
+ pd = readl(pll->pd_addr);
+ pd &= ~(POSTDIV_MASK << pll->data->pd_shift);
+ pd |= (ffs(postdiv) - 1) << pll->data->pd_shift;
+ writel(pd, pll->pd_addr);
+
+ pll_en = readl(pll->base_addr + REG_CON0) & CON0_BASE_EN;
+
+ /* set pcw */
+ val = readl(pll->pcw_addr);
+
+ val &= ~GENMASK(pll->data->pcw_shift + pll->data->pcwbits - 1,
+ pll->data->pcw_shift);
+ val |= pcw << pll->data->pcw_shift;
+ writel(val, pll->pcw_addr);
+
+ con1 = readl(pll->base_addr + REG_CON1);
+
+ if (pll_en)
+ con1 |= CON0_PCW_CHG;
+
+ writel(con1, pll->base_addr + REG_CON1);
+ if (pll->tuner_addr)
+ writel(con1 + 1, pll->tuner_addr);
+
+ if (pll_en)
+ udelay(20);
+}
+
+/*
+ * mtk_pll_calc_values - calculate good values for a given input frequency.
+ * @pll: The pll
+ * @pcw: The pcw value (output)
+ * @postdiv: The post divider (output)
+ * @freq: The desired target frequency
+ * @fin: The input frequency
+ *
+ */
+static void mtk_pll_calc_values(struct mtk_clk_pll *pll, u32 *pcw, u32 *postdiv,
+ u32 freq, u32 fin)
+{
+ unsigned long fmin = 1000 * MHZ;
+ u64 _pcw;
+ u32 val;
+
+ if (freq > pll->data->fmax)
+ freq = pll->data->fmax;
+
+ for (val = 0; val < 4; val++) {
+ *postdiv = 1 << val;
+ if (freq * *postdiv >= fmin)
+ break;
+ }
+
+ /* _pcw = freq * postdiv / fin * 2^pcwfbits */
+ _pcw = ((u64)freq << val) << (pll->data->pcwbits - INTEGER_BITS);
+ do_div(_pcw, fin);
+
+ *pcw = (u32)_pcw;
+}
+
+static int mtk_pll_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ struct mtk_clk_pll *pll = to_mtk_clk_pll(hw);
+ u32 pcw = 0;
+ u32 postdiv;
+
+ mtk_pll_calc_values(pll, &pcw, &postdiv, rate, parent_rate);
+ mtk_pll_set_rate_regs(pll, pcw, postdiv);
+
+ return 0;
+}
+
+static unsigned long mtk_pll_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct mtk_clk_pll *pll = to_mtk_clk_pll(hw);
+ u32 postdiv;
+ u32 pcw;
+
+ postdiv = (readl(pll->pd_addr) >> pll->data->pd_shift) & POSTDIV_MASK;
+ postdiv = 1 << postdiv;
+
+ pcw = readl(pll->pcw_addr) >> pll->data->pcw_shift;
+ pcw &= GENMASK(pll->data->pcwbits - 1, 0);
+
+ return __mtk_pll_recalc_rate(pll, parent_rate, pcw, postdiv);
+}
+
+static long mtk_pll_round_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long *prate)
+{
+ struct mtk_clk_pll *pll = to_mtk_clk_pll(hw);
+ u32 pcw = 0;
+ int postdiv;
+
+ mtk_pll_calc_values(pll, &pcw, &postdiv, rate, *prate);
+
+ return __mtk_pll_recalc_rate(pll, *prate, pcw, postdiv);
+}
+
+static int mtk_pll_prepare(struct clk_hw *hw)
+{
+ struct mtk_clk_pll *pll = to_mtk_clk_pll(hw);
+ u32 r;
+
+ r = readl(pll->pwr_addr) | CON0_PWR_ON;
+ writel(r, pll->pwr_addr);
+ udelay(1);
+
+ r = readl(pll->pwr_addr) & ~CON0_ISO_EN;
+ writel(r, pll->pwr_addr);
+ udelay(1);
+
+ r = readl(pll->base_addr + REG_CON0);
+ r |= pll->data->en_mask;
+ writel(r, pll->base_addr + REG_CON0);
+
+ if (pll->tuner_addr) {
+ r = readl(pll->tuner_addr) | AUDPLL_TUNER_EN;
+ writel(r, pll->tuner_addr);
+ }
+
+ udelay(20);
+
+ if (pll->data->flags & HAVE_RST_BAR) {
+ r = readl(pll->base_addr + REG_CON0);
+ r |= pll->data->rst_bar_mask;
+ writel(r, pll->base_addr + REG_CON0);
+ }
+
+ return 0;
+}
+
+static void mtk_pll_unprepare(struct clk_hw *hw)
+{
+ struct mtk_clk_pll *pll = to_mtk_clk_pll(hw);
+ u32 r;
+
+ if (pll->data->flags & HAVE_RST_BAR) {
+ r = readl(pll->base_addr + REG_CON0);
+ r &= ~pll->data->rst_bar_mask;
+ writel(r, pll->base_addr + REG_CON0);
+ }
+
+ if (pll->tuner_addr) {
+ r = readl(pll->tuner_addr) & ~AUDPLL_TUNER_EN;
+ writel(r, pll->tuner_addr);
+ }
+
+ r = readl(pll->base_addr + REG_CON0);
+ r &= ~CON0_BASE_EN;
+ writel(r, pll->base_addr + REG_CON0);
+
+ r = readl(pll->pwr_addr) | CON0_ISO_EN;
+ writel(r, pll->pwr_addr);
+
+ r = readl(pll->pwr_addr) & ~CON0_PWR_ON;
+ writel(r, pll->pwr_addr);
+}
+
+static const struct clk_ops mtk_pll_ops = {
+ .is_prepared = mtk_pll_is_prepared,
+ .prepare = mtk_pll_prepare,
+ .unprepare = mtk_pll_unprepare,
+ .recalc_rate = mtk_pll_recalc_rate,
+ .round_rate = mtk_pll_round_rate,
+ .set_rate = mtk_pll_set_rate,
+};
+
+static struct clk *mtk_clk_register_pll(const struct mtk_pll_data *data,
+ void __iomem *base)
+{
+ struct mtk_clk_pll *pll;
+ struct clk_init_data init;
+ struct clk *clk;
+ const char *parent_name = "clk26m";
+
+ pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+ if (!pll)
+ return ERR_PTR(-ENOMEM);
+
+ pll->base_addr = base + data->reg;
+ pll->pwr_addr = base + data->pwr_reg;
+ pll->pd_addr = base + data->pd_reg;
+ pll->pcw_addr = base + data->pcw_reg;
+ if (data->tuner_reg)
+ pll->tuner_addr = base + data->tuner_reg;
+ pll->hw.init = &init;
+ pll->data = data;
+
+ init.name = data->name;
+ init.ops = &mtk_pll_ops;
+ init.parent_names = &parent_name;
+ init.num_parents = 1;
+
+ clk = clk_register(NULL, &pll->hw);
+
+ if (IS_ERR(clk))
+ kfree(pll);
+
+ return clk;
+}
+
+void __init mtk_clk_register_plls(struct device_node *node,
+ const struct mtk_pll_data *plls, int num_plls, struct clk_onecell_data *clk_data)
+{
+ void __iomem *base;
+ int r, i;
+ struct clk *clk;
+
+ base = of_iomap(node, 0);
+ if (!base) {
+ pr_err("%s(): ioremap failed\n", __func__);
+ return;
+ }
+
+ for (i = 0; i < num_plls; i++) {
+ const struct mtk_pll_data *pll = &plls[i];
+
+ clk = mtk_clk_register_pll(pll, base);
+
+ if (IS_ERR(clk)) {
+ pr_err("Failed to register clk %s: %ld\n",
+ pll->name, PTR_ERR(clk));
+ continue;
+ }
+
+ clk_data->clks[pll->id] = clk;
+ }
+
+ r = of_clk_add_provider(node, of_clk_src_onecell_get, clk_data);
+ if (r)
+ pr_err("%s(): could not register clock provider: %d\n",
+ __func__, r);
+}
Reference in a new issue Copy permalink