clk: clk-loongson2: add clock controller driver support

This driver provides support for clock controller on Loongson-2 SoC,
the Loongson-2 SoC uses a 100MHz clock as the PLL reference clock,
there are five independent PLLs inside, each of which PLL can
provide up to three sets of frequency dependent clock outputs.

Signed-off-by: Yinbo Zhu <zhuyinbo@loongson.cn>
Link: https://lore.kernel.org/r/20230323025229.2971-2-zhuyinbo@loongson.cn
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

MAINTAINERS

@@ -12121,6 +12121,7 @@ M:	Yinbo Zhu <zhuyinbo@loongson.cn>
 L:	linux-clk@vger.kernel.org
 S:	Maintained
 F:	Documentation/devicetree/bindings/clock/loongson,ls2k-clk.yaml
+F:	drivers/clk/clk-loongson2.c
 F:	include/dt-bindings/clock/loongson,ls2k-clk.h
 
 LSILOGIC MPT FUSION DRIVERS (FC/SAS/SPI)

drivers/clk/Kconfig

@@ -325,6 +325,15 @@ config COMMON_CLK_LOCHNAGAR
 	  This driver supports the clocking features of the Cirrus Logic
 	  Lochnagar audio development board.
 
+config COMMON_CLK_LOONGSON2
+	bool "Clock driver for Loongson-2 SoC"
+	depends on LOONGARCH || COMPILE_TEST
+	help
+          This driver provides support for clock controller on Loongson-2 SoC.
+          The clock controller can generates and supplies clock to various
+          peripherals within the SoC.
+          Say Y here to support Loongson-2 SoC clock driver.
+
 config COMMON_CLK_NXP
 	def_bool COMMON_CLK && (ARCH_LPC18XX || ARCH_LPC32XX)
 	select REGMAP_MMIO if ARCH_LPC32XX

drivers/clk/Makefile

@@ -44,6 +44,7 @@ obj-$(CONFIG_LMK04832)			+= clk-lmk04832.o
 obj-$(CONFIG_COMMON_CLK_LAN966X)	+= clk-lan966x.o
 obj-$(CONFIG_COMMON_CLK_LOCHNAGAR)	+= clk-lochnagar.o
 obj-$(CONFIG_MACH_LOONGSON32)		+= clk-loongson1.o
+obj-$(CONFIG_COMMON_CLK_LOONGSON2)	+= clk-loongson2.o
 obj-$(CONFIG_COMMON_CLK_MAX77686)	+= clk-max77686.o
 obj-$(CONFIG_COMMON_CLK_MAX9485)	+= clk-max9485.o
 obj-$(CONFIG_ARCH_MILBEAUT_M10V)	+= clk-milbeaut.o

drivers/clk/clk-loongson2.c

@@ -0,0 +1,341 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Author: Yinbo Zhu <zhuyinbo@loongson.cn>
+ * Copyright (C) 2022-2023 Loongson Technology Corporation Limited
+ */
+
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/clk-provider.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/io-64-nonatomic-lo-hi.h>
+#include <dt-bindings/clock/loongson,ls2k-clk.h>
+
+#define LOONGSON2_PLL_MULT_SHIFT		32
+#define LOONGSON2_PLL_MULT_WIDTH		10
+#define LOONGSON2_PLL_DIV_SHIFT			26
+#define LOONGSON2_PLL_DIV_WIDTH			6
+#define LOONGSON2_APB_FREQSCALE_SHIFT		20
+#define LOONGSON2_APB_FREQSCALE_WIDTH		3
+#define LOONGSON2_USB_FREQSCALE_SHIFT		16
+#define LOONGSON2_USB_FREQSCALE_WIDTH		3
+#define LOONGSON2_SATA_FREQSCALE_SHIFT		12
+#define LOONGSON2_SATA_FREQSCALE_WIDTH		3
+#define LOONGSON2_BOOT_FREQSCALE_SHIFT		8
+#define LOONGSON2_BOOT_FREQSCALE_WIDTH		3
+
+static void __iomem *loongson2_pll_base;
+
+static const struct clk_parent_data pdata[] = {
+	{ .fw_name = "ref_100m",},
+};
+
+static struct clk_hw *loongson2_clk_register(struct device *dev,
+					  const char *name,
+					  const char *parent_name,
+					  const struct clk_ops *ops,
+					  unsigned long flags)
+{
+	int ret;
+	struct clk_hw *hw;
+	struct clk_init_data init;
+
+	hw = devm_kzalloc(dev, sizeof(*hw), GFP_KERNEL);
+	if (!hw)
+		return ERR_PTR(-ENOMEM);
+
+	init.name = name;
+	init.ops = ops;
+	init.flags = flags;
+	init.num_parents = 1;
+
+	if (!parent_name)
+		init.parent_data = pdata;
+	else
+		init.parent_names = &parent_name;
+
+	hw->init = &init;
+
+	ret = devm_clk_hw_register(dev, hw);
+	if (ret)
+		hw = ERR_PTR(ret);
+
+	return hw;
+}
+
+static unsigned long loongson2_calc_pll_rate(int offset, unsigned long rate)
+{
+	u64 val;
+	u32 mult, div;
+
+	val = readq(loongson2_pll_base + offset);
+
+	mult = (val >> LOONGSON2_PLL_MULT_SHIFT) &
+			clk_div_mask(LOONGSON2_PLL_MULT_WIDTH);
+	div = (val >> LOONGSON2_PLL_DIV_SHIFT) &
+			clk_div_mask(LOONGSON2_PLL_DIV_WIDTH);
+
+	return div_u64((u64)rate * mult, div);
+}
+
+static unsigned long loongson2_node_recalc_rate(struct clk_hw *hw,
+					  unsigned long parent_rate)
+{
+	return loongson2_calc_pll_rate(0x0, parent_rate);
+}
+
+static const struct clk_ops loongson2_node_clk_ops = {
+	.recalc_rate = loongson2_node_recalc_rate,
+};
+
+static unsigned long loongson2_ddr_recalc_rate(struct clk_hw *hw,
+					  unsigned long parent_rate)
+{
+	return loongson2_calc_pll_rate(0x10, parent_rate);
+}
+
+static const struct clk_ops loongson2_ddr_clk_ops = {
+	.recalc_rate = loongson2_ddr_recalc_rate,
+};
+
+static unsigned long loongson2_dc_recalc_rate(struct clk_hw *hw,
+					  unsigned long parent_rate)
+{
+	return loongson2_calc_pll_rate(0x20, parent_rate);
+}
+
+static const struct clk_ops loongson2_dc_clk_ops = {
+	.recalc_rate = loongson2_dc_recalc_rate,
+};
+
+static unsigned long loongson2_pix0_recalc_rate(struct clk_hw *hw,
+					  unsigned long parent_rate)
+{
+	return loongson2_calc_pll_rate(0x30, parent_rate);
+}
+
+static const struct clk_ops loongson2_pix0_clk_ops = {
+	.recalc_rate = loongson2_pix0_recalc_rate,
+};
+
+static unsigned long loongson2_pix1_recalc_rate(struct clk_hw *hw,
+					  unsigned long parent_rate)
+{
+	return loongson2_calc_pll_rate(0x40, parent_rate);
+}
+
+static const struct clk_ops loongson2_pix1_clk_ops = {
+	.recalc_rate = loongson2_pix1_recalc_rate,
+};
+
+static unsigned long loongson2_calc_rate(unsigned long rate,
+					 int shift, int width)
+{
+	u64 val;
+	u32 mult;
+
+	val = readq(loongson2_pll_base + 0x50);
+
+	mult = (val >> shift) & clk_div_mask(width);
+
+	return div_u64((u64)rate * (mult + 1), 8);
+}
+
+static unsigned long loongson2_boot_recalc_rate(struct clk_hw *hw,
+					  unsigned long parent_rate)
+{
+	return loongson2_calc_rate(parent_rate,
+				   LOONGSON2_BOOT_FREQSCALE_SHIFT,
+				   LOONGSON2_BOOT_FREQSCALE_WIDTH);
+}
+
+static const struct clk_ops loongson2_boot_clk_ops = {
+	.recalc_rate = loongson2_boot_recalc_rate,
+};
+
+static unsigned long loongson2_apb_recalc_rate(struct clk_hw *hw,
+					  unsigned long parent_rate)
+{
+	return loongson2_calc_rate(parent_rate,
+				   LOONGSON2_APB_FREQSCALE_SHIFT,
+				   LOONGSON2_APB_FREQSCALE_WIDTH);
+}
+
+static const struct clk_ops loongson2_apb_clk_ops = {
+	.recalc_rate = loongson2_apb_recalc_rate,
+};
+
+static unsigned long loongson2_usb_recalc_rate(struct clk_hw *hw,
+					  unsigned long parent_rate)
+{
+	return loongson2_calc_rate(parent_rate,
+				   LOONGSON2_USB_FREQSCALE_SHIFT,
+				   LOONGSON2_USB_FREQSCALE_WIDTH);
+}
+
+static const struct clk_ops loongson2_usb_clk_ops = {
+	.recalc_rate = loongson2_usb_recalc_rate,
+};
+
+static unsigned long loongson2_sata_recalc_rate(struct clk_hw *hw,
+					  unsigned long parent_rate)
+{
+	return loongson2_calc_rate(parent_rate,
+				   LOONGSON2_SATA_FREQSCALE_SHIFT,
+				   LOONGSON2_SATA_FREQSCALE_WIDTH);
+}
+
+static const struct clk_ops loongson2_sata_clk_ops = {
+	.recalc_rate = loongson2_sata_recalc_rate,
+};
+
+static inline int loongson2_check_clk_hws(struct clk_hw *clks[], unsigned int count)
+{
+	unsigned int i;
+
+	for (i = 0; i < count; i++)
+		if (IS_ERR(clks[i])) {
+			pr_err("Loongson2 clk %u: register failed with %ld\n",
+				i, PTR_ERR(clks[i]));
+			return PTR_ERR(clks[i]);
+		}
+
+	return 0;
+}
+
+static int loongson2_clk_probe(struct platform_device *pdev)
+{
+	int ret;
+	struct clk_hw **hws;
+	struct clk_hw_onecell_data *clk_hw_data;
+	spinlock_t loongson2_clk_lock;
+	struct device *dev = &pdev->dev;
+
+	loongson2_pll_base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(loongson2_pll_base))
+		return PTR_ERR(loongson2_pll_base);
+
+	clk_hw_data = devm_kzalloc(dev, struct_size(clk_hw_data, hws, LOONGSON2_CLK_END),
+					GFP_KERNEL);
+	if (WARN_ON(!clk_hw_data))
+		return -ENOMEM;
+
+	clk_hw_data->num = LOONGSON2_CLK_END;
+	hws = clk_hw_data->hws;
+
+	hws[LOONGSON2_NODE_PLL] = loongson2_clk_register(dev, "node_pll",
+						NULL,
+						&loongson2_node_clk_ops, 0);
+
+	hws[LOONGSON2_DDR_PLL] = loongson2_clk_register(dev, "ddr_pll",
+						NULL,
+						&loongson2_ddr_clk_ops, 0);
+
+	hws[LOONGSON2_DC_PLL] = loongson2_clk_register(dev, "dc_pll",
+						NULL,
+						&loongson2_dc_clk_ops, 0);
+
+	hws[LOONGSON2_PIX0_PLL] = loongson2_clk_register(dev, "pix0_pll",
+						NULL,
+						&loongson2_pix0_clk_ops, 0);
+
+	hws[LOONGSON2_PIX1_PLL] = loongson2_clk_register(dev, "pix1_pll",
+						NULL,
+						&loongson2_pix1_clk_ops, 0);
+
+	hws[LOONGSON2_BOOT_CLK] = loongson2_clk_register(dev, "boot",
+						NULL,
+						&loongson2_boot_clk_ops, 0);
+
+	hws[LOONGSON2_NODE_CLK] = devm_clk_hw_register_divider(dev, "node",
+						"node_pll", 0,
+						loongson2_pll_base + 0x8, 0,
+						6, CLK_DIVIDER_ONE_BASED,
+						&loongson2_clk_lock);
+
+	/*
+	 * The hda clk divisor in the upper 32bits and the clk-prodiver
+	 * layer code doesn't support 64bit io operation thus a conversion
+	 * is required that subtract shift by 32 and add 4byte to the hda
+	 * address
+	 */
+	hws[LOONGSON2_HDA_CLK] = devm_clk_hw_register_divider(dev, "hda",
+						"ddr_pll", 0,
+						loongson2_pll_base + 0x22, 12,
+						7, CLK_DIVIDER_ONE_BASED,
+						&loongson2_clk_lock);
+
+	hws[LOONGSON2_GPU_CLK] = devm_clk_hw_register_divider(dev, "gpu",
+						"ddr_pll", 0,
+						loongson2_pll_base + 0x18, 22,
+						6, CLK_DIVIDER_ONE_BASED,
+						&loongson2_clk_lock);
+
+	hws[LOONGSON2_DDR_CLK] = devm_clk_hw_register_divider(dev, "ddr",
+						"ddr_pll", 0,
+						loongson2_pll_base + 0x18, 0,
+						6, CLK_DIVIDER_ONE_BASED,
+						&loongson2_clk_lock);
+
+	hws[LOONGSON2_GMAC_CLK] = devm_clk_hw_register_divider(dev, "gmac",
+						"dc_pll", 0,
+						loongson2_pll_base + 0x28, 22,
+						6, CLK_DIVIDER_ONE_BASED,
+						&loongson2_clk_lock);
+
+	hws[LOONGSON2_DC_CLK] = devm_clk_hw_register_divider(dev, "dc",
+						"dc_pll", 0,
+						loongson2_pll_base + 0x28, 0,
+						6, CLK_DIVIDER_ONE_BASED,
+						&loongson2_clk_lock);
+
+	hws[LOONGSON2_APB_CLK] = loongson2_clk_register(dev, "apb",
+						"gmac",
+						&loongson2_apb_clk_ops, 0);
+
+	hws[LOONGSON2_USB_CLK] = loongson2_clk_register(dev, "usb",
+						"gmac",
+						&loongson2_usb_clk_ops, 0);
+
+	hws[LOONGSON2_SATA_CLK] = loongson2_clk_register(dev, "sata",
+						"gmac",
+						&loongson2_sata_clk_ops, 0);
+
+	hws[LOONGSON2_PIX0_CLK] = clk_hw_register_divider(NULL, "pix0",
+						"pix0_pll", 0,
+						loongson2_pll_base + 0x38, 0, 6,
+						CLK_DIVIDER_ONE_BASED,
+						&loongson2_clk_lock);
+
+	hws[LOONGSON2_PIX1_CLK] = clk_hw_register_divider(NULL, "pix1",
+						"pix1_pll", 0,
+						loongson2_pll_base + 0x48, 0, 6,
+						CLK_DIVIDER_ONE_BASED,
+						&loongson2_clk_lock);
+
+	ret = loongson2_check_clk_hws(hws, LOONGSON2_CLK_END);
+	if (ret)
+		return ret;
+
+	return devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, clk_hw_data);
+}
+
+static const struct of_device_id loongson2_clk_match_table[] = {
+	{ .compatible = "loongson,ls2k-clk" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, loongson2_clk_match_table);
+
+static struct platform_driver loongson2_clk_driver = {
+	.probe	= loongson2_clk_probe,
+	.driver	= {
+		.name	= "loongson2-clk",
+		.of_match_table	= loongson2_clk_match_table,
+	},
+};
+module_platform_driver(loongson2_clk_driver);
+
+MODULE_DESCRIPTION("Loongson2 clock driver");
+MODULE_LICENSE("GPL");