[PATCH v9 2/5] clk: meson: a1: add Amlogic A1 PLL clock controller driver

[Dmitry Rokosov <ddrokosov@sberdevices.ru>]

Introduce PLL clock controller for Amlogic A1 SoC family.

Signed-off-by: Jian Hu <jian.hu@amlogic.com>
Signed-off-by: Dmitry Rokosov <ddrokosov@sberdevices.ru>
---
 drivers/clk/meson/Kconfig  |  10 +
 drivers/clk/meson/Makefile |   1 +
 drivers/clk/meson/a1-pll.c | 365 +++++++++++++++++++++++++++++++++++++
 drivers/clk/meson/a1-pll.h |  47 +++++
 4 files changed, 423 insertions(+)
 create mode 100644 drivers/clk/meson/a1-pll.c
 create mode 100644 drivers/clk/meson/a1-pll.h

diff --git a/drivers/clk/meson/Kconfig b/drivers/clk/meson/Kconfig
index fc002c155bc3..f56da2a4b000 100644
--- a/drivers/clk/meson/Kconfig
+++ b/drivers/clk/meson/Kconfig
@@ -99,6 +99,16 @@ config COMMON_CLK_AXG_AUDIO
 	  Support for the audio clock controller on AmLogic A113D devices,
 	  aka axg, Say Y if you want audio subsystem to work.
 
+config COMMON_CLK_A1_PLL
+	tristate "Meson A1 SoC PLL controller support"
+	depends on ARM64
+	select COMMON_CLK_MESON_REGMAP
+	select COMMON_CLK_MESON_PLL
+	help
+	  Support for the PLL clock controller on Amlogic A113L based
+	  device, A1 SoC Family. Say Y if you want A1 PLL clock controller
+	  to work.
+
 config COMMON_CLK_G12A
 	tristate "G12 and SM1 SoC clock controllers support"
 	depends on ARM64
diff --git a/drivers/clk/meson/Makefile b/drivers/clk/meson/Makefile
index 6eca2a406ee3..2f17f475a48f 100644
--- a/drivers/clk/meson/Makefile
+++ b/drivers/clk/meson/Makefile
@@ -16,6 +16,7 @@ obj-$(CONFIG_COMMON_CLK_MESON_VID_PLL_DIV) += vid-pll-div.o
 
 obj-$(CONFIG_COMMON_CLK_AXG) += axg.o axg-aoclk.o
 obj-$(CONFIG_COMMON_CLK_AXG_AUDIO) += axg-audio.o
+obj-$(CONFIG_COMMON_CLK_A1_PLL) += a1-pll.o
 obj-$(CONFIG_COMMON_CLK_GXBB) += gxbb.o gxbb-aoclk.o
 obj-$(CONFIG_COMMON_CLK_G12A) += g12a.o g12a-aoclk.o
 obj-$(CONFIG_COMMON_CLK_MESON8B) += meson8b.o meson8-ddr.o
diff --git a/drivers/clk/meson/a1-pll.c b/drivers/clk/meson/a1-pll.c
new file mode 100644
index 000000000000..c565f9b2a8dd
--- /dev/null
+++ b/drivers/clk/meson/a1-pll.c
@@ -0,0 +1,365 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright (c) 2019 Amlogic, Inc. All rights reserved.
+ * Author: Jian Hu <jian.hu@amlogic.com>
+ *
+ * Copyright (c) 2023, SberDevices. All Rights Reserved.
+ * Author: Dmitry Rokosov <ddrokosov@sberdevices.ru>
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include "meson-a1-clkc.h"
+#include "a1-pll.h"
+#include "clk-regmap.h"
+
+static struct clk_regmap fixed_pll_dco = {
+	.data = &(struct meson_clk_pll_data){
+		.en = {
+			.reg_off = ANACTRL_FIXPLL_CTRL0,
+			.shift   = 28,
+			.width   = 1,
+		},
+		.m = {
+			.reg_off = ANACTRL_FIXPLL_CTRL0,
+			.shift   = 0,
+			.width   = 8,
+		},
+		.n = {
+			.reg_off = ANACTRL_FIXPLL_CTRL0,
+			.shift   = 10,
+			.width   = 5,
+		},
+		.frac = {
+			.reg_off = ANACTRL_FIXPLL_CTRL1,
+			.shift   = 0,
+			.width   = 19,
+		},
+		.l = {
+			.reg_off = ANACTRL_FIXPLL_STS,
+			.shift   = 31,
+			.width   = 1,
+		},
+		.rst = {
+			.reg_off = ANACTRL_FIXPLL_CTRL0,
+			.shift   = 29,
+			.width   = 1,
+		},
+	},
+	.hw.init = &(struct clk_init_data){
+		.name = "fixed_pll_dco",
+		.ops = &meson_clk_pll_ro_ops,
+		.parent_data = &(const struct clk_parent_data) {
+			.fw_name = "fixpll_in",
+		},
+		.num_parents = 1,
+	},
+};
+
+static struct clk_regmap fixed_pll = {
+	.data = &(struct clk_regmap_gate_data){
+		.offset = ANACTRL_FIXPLL_CTRL0,
+		.bit_idx = 20,
+	},
+	.hw.init = &(struct clk_init_data) {
+		.name = "fixed_pll",
+		.ops = &clk_regmap_gate_ops,
+		.parent_hws = (const struct clk_hw *[]) {
+			&fixed_pll_dco.hw
+		},
+		.num_parents = 1,
+		/*
+		 * It is enough that the fdiv leaf has critical flag,
+		 * No critical or unused flag here.
+		 */
+	},
+};
+
+static const struct pll_mult_range hifi_pll_mult_range = {
+	.min = 32,
+	.max = 64,
+};
+
+static const struct reg_sequence hifi_init_regs[] = {
+	{ .reg = ANACTRL_HIFIPLL_CTRL1, .def = 0x01800000 },
+	{ .reg = ANACTRL_HIFIPLL_CTRL2, .def = 0x00001100 },
+	{ .reg = ANACTRL_HIFIPLL_CTRL3, .def = 0x100a1100 },
+	{ .reg = ANACTRL_HIFIPLL_CTRL4, .def = 0x00302000 },
+	{ .reg = ANACTRL_HIFIPLL_CTRL0, .def = 0x01f18440 },
+};
+
+static struct clk_regmap hifi_pll = {
+	.data = &(struct meson_clk_pll_data){
+		.en = {
+			.reg_off = ANACTRL_HIFIPLL_CTRL0,
+			.shift   = 28,
+			.width   = 1,
+		},
+		.m = {
+			.reg_off = ANACTRL_HIFIPLL_CTRL0,
+			.shift   = 0,
+			.width   = 8,
+		},
+		.n = {
+			.reg_off = ANACTRL_HIFIPLL_CTRL0,
+			.shift   = 10,
+			.width   = 5,
+		},
+		.frac = {
+			.reg_off = ANACTRL_HIFIPLL_CTRL1,
+			.shift   = 0,
+			.width   = 19,
+		},
+		.l = {
+			.reg_off = ANACTRL_HIFIPLL_STS,
+			.shift   = 31,
+			.width   = 1,
+		},
+		.current_en = {
+			.reg_off = ANACTRL_HIFIPLL_CTRL0,
+			.shift   = 26,
+			.width   = 1,
+		},
+		.l_detect = {
+			.reg_off = ANACTRL_HIFIPLL_CTRL2,
+			.shift   = 6,
+			.width   = 1,
+		},
+		.range = &hifi_pll_mult_range,
+		.init_regs = hifi_init_regs,
+		.init_count = ARRAY_SIZE(hifi_init_regs),
+	},
+	.hw.init = &(struct clk_init_data){
+		.name = "hifi_pll",
+		.ops = &meson_clk_pll_ops,
+		.parent_data = &(const struct clk_parent_data) {
+			.fw_name = "hifipll_in",
+		},
+		.num_parents = 1,
+	},
+};
+
+static struct clk_fixed_factor fclk_div2_div = {
+	.mult = 1,
+	.div = 2,
+	.hw.init = &(struct clk_init_data){
+		.name = "fclk_div2_div",
+		.ops = &clk_fixed_factor_ops,
+		.parent_hws = (const struct clk_hw *[]) {
+			&fixed_pll.hw
+		},
+		.num_parents = 1,
+	},
+};
+
+static struct clk_regmap fclk_div2 = {
+	.data = &(struct clk_regmap_gate_data){
+		.offset = ANACTRL_FIXPLL_CTRL0,
+		.bit_idx = 21,
+	},
+	.hw.init = &(struct clk_init_data){
+		.name = "fclk_div2",
+		.ops = &clk_regmap_gate_ops,
+		.parent_hws = (const struct clk_hw *[]) {
+			&fclk_div2_div.hw
+		},
+		.num_parents = 1,
+		/*
+		 * This clock is used by DDR clock in BL2 firmware
+		 * and is required by the platform to operate correctly.
+		 * Until the following condition are met, we need this clock to
+		 * be marked as critical:
+		 * a) Mark the clock used by a firmware resource, if possible
+		 * b) CCF has a clock hand-off mechanism to make the sure the
+		 *    clock stays on until the proper driver comes along
+		 */
+		.flags = CLK_IS_CRITICAL,
+	},
+};
+
+static struct clk_fixed_factor fclk_div3_div = {
+	.mult = 1,
+	.div = 3,
+	.hw.init = &(struct clk_init_data){
+		.name = "fclk_div3_div",
+		.ops = &clk_fixed_factor_ops,
+		.parent_hws = (const struct clk_hw *[]) {
+			&fixed_pll.hw
+		},
+		.num_parents = 1,
+	},
+};
+
+static struct clk_regmap fclk_div3 = {
+	.data = &(struct clk_regmap_gate_data){
+		.offset = ANACTRL_FIXPLL_CTRL0,
+		.bit_idx = 22,
+	},
+	.hw.init = &(struct clk_init_data){
+		.name = "fclk_div3",
+		.ops = &clk_regmap_gate_ops,
+		.parent_hws = (const struct clk_hw *[]) {
+			&fclk_div3_div.hw
+		},
+		.num_parents = 1,
+		/*
+		 * This clock is used by APB bus which is set in boot ROM code
+		 * and is required by the platform to operate correctly.
+		 * About critical, refer to fclk_div2.
+		 */
+		.flags = CLK_IS_CRITICAL,
+	},
+};
+
+static struct clk_fixed_factor fclk_div5_div = {
+	.mult = 1,
+	.div = 5,
+	.hw.init = &(struct clk_init_data){
+		.name = "fclk_div5_div",
+		.ops = &clk_fixed_factor_ops,
+		.parent_hws = (const struct clk_hw *[]) {
+			&fixed_pll.hw
+		},
+		.num_parents = 1,
+	},
+};
+
+static struct clk_regmap fclk_div5 = {
+	.data = &(struct clk_regmap_gate_data){
+		.offset = ANACTRL_FIXPLL_CTRL0,
+		.bit_idx = 23,
+	},
+	.hw.init = &(struct clk_init_data){
+		.name = "fclk_div5",
+		.ops = &clk_regmap_gate_ops,
+		.parent_hws = (const struct clk_hw *[]) {
+			&fclk_div5_div.hw
+		},
+		.num_parents = 1,
+		/*
+		 * This clock is used by AXI bus which setted in Romcode
+		 * and is required by the platform to operate correctly.
+		 * About critical, refer to fclk_div2.
+		 */
+		.flags = CLK_IS_CRITICAL,
+	},
+};
+
+static struct clk_fixed_factor fclk_div7_div = {
+	.mult = 1,
+	.div = 7,
+	.hw.init = &(struct clk_init_data){
+		.name = "fclk_div7_div",
+		.ops = &clk_fixed_factor_ops,
+		.parent_hws = (const struct clk_hw *[]) {
+			&fixed_pll.hw
+		},
+		.num_parents = 1,
+	},
+};
+
+static struct clk_regmap fclk_div7 = {
+	.data = &(struct clk_regmap_gate_data){
+		.offset = ANACTRL_FIXPLL_CTRL0,
+		.bit_idx = 24,
+	},
+	.hw.init = &(struct clk_init_data){
+		.name = "fclk_div7",
+		.ops = &clk_regmap_gate_ops,
+		.parent_hws = (const struct clk_hw *[]) {
+			&fclk_div7_div.hw
+		},
+		.num_parents = 1,
+	},
+};
+
+/* Array of all clocks provided by this provider */
+static struct clk_hw_onecell_data a1_pll_hw_onecell_data = {
+	.hws = {
+		[CLKID_FIXED_PLL_DCO]	= &fixed_pll_dco.hw,
+		[CLKID_FIXED_PLL]	= &fixed_pll.hw,
+		[CLKID_FCLK_DIV2_DIV]	= &fclk_div2_div.hw,
+		[CLKID_FCLK_DIV3_DIV]	= &fclk_div3_div.hw,
+		[CLKID_FCLK_DIV5_DIV]	= &fclk_div5_div.hw,
+		[CLKID_FCLK_DIV7_DIV]	= &fclk_div7_div.hw,
+		[CLKID_FCLK_DIV2]	= &fclk_div2.hw,
+		[CLKID_FCLK_DIV3]	= &fclk_div3.hw,
+		[CLKID_FCLK_DIV5]	= &fclk_div5.hw,
+		[CLKID_FCLK_DIV7]	= &fclk_div7.hw,
+		[CLKID_HIFI_PLL]	= &hifi_pll.hw,
+		[NR_PLL_CLKS]		= NULL,
+	},
+	.num = NR_PLL_CLKS,
+};
+
+static struct clk_regmap *const a1_pll_regmaps[] = {
+	&fixed_pll_dco,
+	&fixed_pll,
+	&fclk_div2,
+	&fclk_div3,
+	&fclk_div5,
+	&fclk_div7,
+	&hifi_pll,
+};
+
+static struct regmap_config a1_pll_regmap_cfg = {
+	.reg_bits   = 32,
+	.val_bits   = 32,
+	.reg_stride = 4,
+};
+
+static int meson_a1_pll_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct clk_hw *hw;
+	void __iomem *base;
+	struct regmap *map;
+	int clkid, i, err;
+
+	base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(base))
+		return dev_err_probe(dev, PTR_ERR(base),
+				     "can't ioremap resource\n");
+
+	map = devm_regmap_init_mmio(dev, base, &a1_pll_regmap_cfg);
+	if (IS_ERR(map))
+		return dev_err_probe(dev, PTR_ERR(map),
+				     "can't init regmap mmio region\n");
+
+	/* Populate regmap for the regmap backed clocks */
+	for (i = 0; i < ARRAY_SIZE(a1_pll_regmaps); i++)
+		a1_pll_regmaps[i]->map = map;
+
+	for (clkid = 0; clkid < a1_pll_hw_onecell_data.num; clkid++) {
+		hw = a1_pll_hw_onecell_data.hws[clkid];
+		err = devm_clk_hw_register(dev, hw);
+		if (err)
+			return dev_err_probe(dev, err,
+					     "clock registration failed\n");
+	}
+
+	return devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get,
+					   &a1_pll_hw_onecell_data);
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id a1_pll_clkc_match_table[] = {
+	{ .compatible = "amlogic,a1-pll-clkc", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, a1_pll_clkc_match_table);
+#endif /* CONFIG_OF */
+
+static struct platform_driver a1_pll_clkc_driver = {
+	.probe = meson_a1_pll_probe,
+	.driver = {
+		.name = "a1-pll-clkc",
+		.of_match_table = of_match_ptr(a1_pll_clkc_match_table),
+	},
+};
+
+module_platform_driver(a1_pll_clkc_driver);
+MODULE_AUTHOR("Jian Hu <jian.hu@amlogic.com>");
+MODULE_AUTHOR("Dmitry Rokosov <ddrokosov@sberdevices.ru>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/clk/meson/a1-pll.h b/drivers/clk/meson/a1-pll.h
new file mode 100644
index 000000000000..de2eebce98af
--- /dev/null
+++ b/drivers/clk/meson/a1-pll.h
@@ -0,0 +1,47 @@
+/* SPDX-License-Identifier: (GPL-2.0+ OR MIT) */
+/*
+ * Amlogic Meson-A1 PLL Clock Controller internals
+ *
+ * Copyright (c) 2019 Amlogic, Inc. All rights reserved.
+ * Author: Jian Hu <jian.hu@amlogic.com>
+ *
+ * Copyright (c) 2023, SberDevices. All Rights Reserved.
+ * Author: Dmitry Rokosov <ddrokosov@sberdevices.ru>
+ */
+
+#ifndef __A1_PLL_H
+#define __A1_PLL_H
+
+#include "clk-pll.h"
+
+/* PLL register offset */
+#define ANACTRL_FIXPLL_CTRL0	0x0
+#define ANACTRL_FIXPLL_CTRL1	0x4
+#define ANACTRL_FIXPLL_STS	0x14
+#define ANACTRL_HIFIPLL_CTRL0	0xc0
+#define ANACTRL_HIFIPLL_CTRL1	0xc4
+#define ANACTRL_HIFIPLL_CTRL2	0xc8
+#define ANACTRL_HIFIPLL_CTRL3	0xcc
+#define ANACTRL_HIFIPLL_CTRL4	0xd0
+#define ANACTRL_HIFIPLL_STS	0xd4
+
+/*
+ * CLKID index values
+ *
+ * These indices are entirely contrived and do not map onto the hardware.
+ * It has now been decided to expose everything by default in the DT header:
+ * include/dt-bindings/clock/a1-pll-clkc.h. Only the clocks ids we don't want
+ * to expose, such as the internal muxes and dividers of composite clocks,
+ * will remain defined here.
+ */
+#define CLKID_FIXED_PLL_DCO	0
+#define CLKID_FCLK_DIV2_DIV	2
+#define CLKID_FCLK_DIV3_DIV	3
+#define CLKID_FCLK_DIV5_DIV	4
+#define CLKID_FCLK_DIV7_DIV	5
+#define NR_PLL_CLKS		11
+
+/* include the CLKIDs that have been made part of the DT binding */
+#include <dt-bindings/clock/a1-pll-clkc.h>
+
+#endif /* __A1_PLL_H */
-- 
2.36.0


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