clk: renesas: cpg-mssr: Add support for R-Car S4-8

Initial CPG support for R-Car S4-8 (r8a779f0).

Inspired by patches in the BSP by LUU HOAI.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Link: https://lore.kernel.org/r/20211201073308.1003945-10-yoshihiro.shimoda.uh@renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

drivers/clk/renesas/Kconfig

@@ -31,6 +31,7 @@ config CLK_RENESAS
 	select CLK_R8A77990 if ARCH_R8A77990
 	select CLK_R8A77995 if ARCH_R8A77995
 	select CLK_R8A779A0 if ARCH_R8A779A0
+	select CLK_R8A779F0 if ARCH_R8A779F0
 	select CLK_R9A06G032 if ARCH_R9A06G032
 	select CLK_R9A07G044 if ARCH_R9A07G044
 	select CLK_SH73A0 if ARCH_SH73A0
@@ -151,6 +152,10 @@ config CLK_R8A779A0
 	bool "R-Car V3U clock support" if COMPILE_TEST
 	select CLK_RCAR_GEN4_CPG
 
+config CLK_R8A779F0
+	bool "R-Car S4-8 clock support" if COMPILE_TEST
+	select CLK_RCAR_GEN4_CPG
+
 config CLK_R9A06G032
 	bool "RZ/N1D clock support" if COMPILE_TEST
 

drivers/clk/renesas/Makefile

@@ -28,6 +28,7 @@ obj-$(CONFIG_CLK_R8A77980)		+= r8a77980-cpg-mssr.o
 obj-$(CONFIG_CLK_R8A77990)		+= r8a77990-cpg-mssr.o
 obj-$(CONFIG_CLK_R8A77995)		+= r8a77995-cpg-mssr.o
 obj-$(CONFIG_CLK_R8A779A0)		+= r8a779a0-cpg-mssr.o
+obj-$(CONFIG_CLK_R8A779F0)		+= r8a779f0-cpg-mssr.o
 obj-$(CONFIG_CLK_R9A06G032)		+= r9a06g032-clocks.o
 obj-$(CONFIG_CLK_R9A07G044)		+= r9a07g044-cpg.o
 obj-$(CONFIG_CLK_SH73A0)		+= clk-sh73a0.o

drivers/clk/renesas/r8a779f0-cpg-mssr.c

@@ -0,0 +1,183 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * r8a779f0 Clock Pulse Generator / Module Standby and Software Reset
+ *
+ * Copyright (C) 2021 Renesas Electronics Corp.
+ *
+ * Based on r8a779a0-cpg-mssr.c
+ */
+
+#include <linux/bitfield.h>
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include <linux/soc/renesas/rcar-rst.h>
+
+#include <dt-bindings/clock/r8a779f0-cpg-mssr.h>
+
+#include "renesas-cpg-mssr.h"
+#include "rcar-gen4-cpg.h"
+
+enum clk_ids {
+	/* Core Clock Outputs exported to DT */
+	LAST_DT_CORE_CLK = R8A779F0_CLK_R,
+
+	/* External Input Clocks */
+	CLK_EXTAL,
+	CLK_EXTALR,
+
+	/* Internal Core Clocks */
+	CLK_MAIN,
+	CLK_PLL1,
+	CLK_PLL2,
+	CLK_PLL3,
+	CLK_PLL5,
+	CLK_PLL6,
+	CLK_PLL1_DIV2,
+	CLK_PLL2_DIV2,
+	CLK_PLL3_DIV2,
+	CLK_PLL5_DIV2,
+	CLK_PLL5_DIV4,
+	CLK_PLL6_DIV2,
+	CLK_S0,
+	CLK_SDSRC,
+	CLK_RPCSRC,
+	CLK_OCO,
+
+	/* Module Clocks */
+	MOD_CLK_BASE
+};
+
+static const struct cpg_core_clk r8a779f0_core_clks[] __initconst = {
+	/* External Clock Inputs */
+	DEF_INPUT("extal",	CLK_EXTAL),
+	DEF_INPUT("extalr",	CLK_EXTALR),
+
+	/* Internal Core Clocks */
+	DEF_BASE(".main", CLK_MAIN,	CLK_TYPE_GEN4_MAIN, CLK_EXTAL),
+	DEF_BASE(".pll1", CLK_PLL1,	CLK_TYPE_GEN4_PLL1, CLK_MAIN),
+	DEF_BASE(".pll2", CLK_PLL2,	CLK_TYPE_GEN4_PLL2, CLK_MAIN),
+	DEF_BASE(".pll3", CLK_PLL3,	CLK_TYPE_GEN4_PLL3, CLK_MAIN),
+	DEF_BASE(".pll5", CLK_PLL5,	CLK_TYPE_GEN4_PLL5, CLK_MAIN),
+	DEF_BASE(".pll6", CLK_PLL6,	CLK_TYPE_GEN4_PLL6, CLK_MAIN),
+
+	DEF_FIXED(".pll1_div2",	CLK_PLL1_DIV2,	CLK_PLL1,	2, 1),
+	DEF_FIXED(".pll2_div2",	CLK_PLL2_DIV2,	CLK_PLL2,	2, 1),
+	DEF_FIXED(".pll3_div2",	CLK_PLL3_DIV2,	CLK_PLL3,	2, 1),
+	DEF_FIXED(".pll5_div2",	CLK_PLL5_DIV2,	CLK_PLL5,	2, 1),
+	DEF_FIXED(".pll5_div4",	CLK_PLL5_DIV4,	CLK_PLL5_DIV2,	2, 1),
+	DEF_FIXED(".pll6_div2",	CLK_PLL6_DIV2,	CLK_PLL6,	2, 1),
+	DEF_FIXED(".s0",	CLK_S0,		CLK_PLL1_DIV2,	2, 1),
+	DEF_BASE(".sdsrc",	CLK_SDSRC,	CLK_TYPE_GEN4_SDSRC, CLK_PLL5),
+	DEF_RATE(".oco",	CLK_OCO,	32768),
+
+	DEF_BASE(".rpcsrc",	CLK_RPCSRC,		CLK_TYPE_GEN4_RPCSRC, CLK_PLL5),
+	DEF_BASE(".rpc",	R8A779F0_CLK_RPC,	CLK_TYPE_GEN4_RPC, CLK_RPCSRC),
+	DEF_BASE("rpcd2",	R8A779F0_CLK_RPCD2,	CLK_TYPE_GEN4_RPCD2, R8A779F0_CLK_RPC),
+
+	/* Core Clock Outputs */
+	DEF_FIXED("s0d2",	R8A779F0_CLK_S0D2,	CLK_S0,		2, 1),
+	DEF_FIXED("s0d3",	R8A779F0_CLK_S0D3,	CLK_S0,		3, 1),
+	DEF_FIXED("s0d4",	R8A779F0_CLK_S0D4,	CLK_S0,		4, 1),
+	DEF_FIXED("cl16m",	R8A779F0_CLK_CL16M,	CLK_S0,		48, 1),
+	DEF_FIXED("s0d2_mm",	R8A779F0_CLK_S0D2_MM,	CLK_S0,		2, 1),
+	DEF_FIXED("s0d3_mm",	R8A779F0_CLK_S0D3_MM,	CLK_S0,		3, 1),
+	DEF_FIXED("s0d4_mm",	R8A779F0_CLK_S0D4_MM,	CLK_S0,		4, 1),
+	DEF_FIXED("cl16m_mm",	R8A779F0_CLK_CL16M_MM,	CLK_S0,		48, 1),
+	DEF_FIXED("s0d2_rt",	R8A779F0_CLK_S0D2_RT,	CLK_S0,		2, 1),
+	DEF_FIXED("s0d3_rt",	R8A779F0_CLK_S0D3_RT,	CLK_S0,		3, 1),
+	DEF_FIXED("s0d4_rt",	R8A779F0_CLK_S0D4_RT,	CLK_S0,		4, 1),
+	DEF_FIXED("s0d6_rt",	R8A779F0_CLK_S0D6_RT,	CLK_S0,		6, 1),
+	DEF_FIXED("cl16m_rt",	R8A779F0_CLK_CL16M_RT,	CLK_S0,		48, 1),
+	DEF_FIXED("s0d3_per",	R8A779F0_CLK_S0D3_PER,	CLK_S0,		3, 1),
+	DEF_FIXED("s0d6_per",	R8A779F0_CLK_S0D6_PER,	CLK_S0,		6, 1),
+	DEF_FIXED("s0d12_per",	R8A779F0_CLK_S0D12_PER,	CLK_S0,		12, 1),
+	DEF_FIXED("s0d24_per",	R8A779F0_CLK_S0D24_PER,	CLK_S0,		24, 1),
+	DEF_FIXED("cl16m_per",	R8A779F0_CLK_CL16M_PER,	CLK_S0,		48, 1),
+	DEF_FIXED("s0d2_hsc",	R8A779F0_CLK_S0D2_HSC,	CLK_S0,		2, 1),
+	DEF_FIXED("s0d3_hsc",	R8A779F0_CLK_S0D3_HSC,	CLK_S0,		3, 1),
+	DEF_FIXED("s0d4_hsc",	R8A779F0_CLK_S0D4_HSC,	CLK_S0,		4, 1),
+	DEF_FIXED("s0d6_hsc",	R8A779F0_CLK_S0D6_HSC,	CLK_S0,		6, 1),
+	DEF_FIXED("s0d12_hsc",	R8A779F0_CLK_S0D12_HSC,	CLK_S0,		12, 1),
+	DEF_FIXED("cl16m_hsc",	R8A779F0_CLK_CL16M_HSC,	CLK_S0,		48, 1),
+	DEF_FIXED("s0d2_cc",	R8A779F0_CLK_S0D2_CC,	CLK_S0,		2, 1),
+	DEF_FIXED("rsw2",	R8A779F0_CLK_RSW2,	CLK_PLL5,	2, 1),
+	DEF_FIXED("cbfusa",	R8A779F0_CLK_CBFUSA,	CLK_EXTAL,	2, 1),
+	DEF_FIXED("cpex",	R8A779F0_CLK_CPEX,	CLK_EXTAL,	2, 1),
+
+	DEF_GEN4_SD("sd0",	R8A779F0_CLK_SD0,	CLK_SDSRC,	0x870),
+	DEF_DIV6P1("mso",	R8A779F0_CLK_MSO,	CLK_PLL5_DIV4,	0x87c),
+
+	DEF_GEN4_OSC("osc",	R8A779F0_CLK_OSC,	CLK_EXTAL,	8),
+	DEF_GEN4_MDSEL("r",	R8A779F0_CLK_R, 29, CLK_EXTALR, 1, CLK_OCO, 1),
+};
+
+static const struct mssr_mod_clk r8a779f0_mod_clks[] __initconst = {
+	DEF_MOD("scif0",	702,	R8A779F0_CLK_S0D12_PER),
+	DEF_MOD("scif1",	703,	R8A779F0_CLK_S0D12_PER),
+	DEF_MOD("scif3",	704,	R8A779F0_CLK_S0D12_PER),
+	DEF_MOD("scif4",	705,	R8A779F0_CLK_S0D12_PER),
+};
+
+/*
+ * CPG Clock Data
+ */
+/*
+ *   MD	 EXTAL		PLL1	PLL2	PLL3	PLL5	PLL6	OSC
+ * 14 13 (MHz)
+ * ----------------------------------------------------------------
+ * 0  0	 16    / 1	x200	x150	x200	x200	x134	/15
+ * 0  1	 20    / 1	x160	x120	x160	x160	x106	/19
+ * 1  0	 Prohibited setting
+ * 1  1	 40    / 2	x160	x120	x160	x160	x106	/38
+ */
+#define CPG_PLL_CONFIG_INDEX(md)	((((md) & BIT(14)) >> 13) | \
+					 (((md) & BIT(13)) >> 13))
+
+static const struct rcar_gen4_cpg_pll_config cpg_pll_configs[4] = {
+	/* EXTAL div	PLL1 mult/div	PLL2 mult/div	PLL3 mult/div	PLL5 mult/div	PLL6 mult/div	OSC prediv */
+	{ 1,		200,	1,	150,	1,	200,	1,	200,	1,	134,	1,	15,	},
+	{ 1,		160,	1,	120,	1,	160,	1,	160,	1,	106,	1,	19,	},
+	{ 0,		0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	0,	},
+	{ 2,		160,	1,	120,	1,	160,	1,	160,	1,	106,	1,	38,	},
+};
+
+static int __init r8a779f0_cpg_mssr_init(struct device *dev)
+{
+	const struct rcar_gen4_cpg_pll_config *cpg_pll_config;
+	u32 cpg_mode;
+	int error;
+
+	error = rcar_rst_read_mode_pins(&cpg_mode);
+	if (error)
+		return error;
+
+	cpg_pll_config = &cpg_pll_configs[CPG_PLL_CONFIG_INDEX(cpg_mode)];
+	if (!cpg_pll_config->extal_div) {
+		dev_err(dev, "Prohibited setting (cpg_mode=0x%x)\n", cpg_mode);
+		return -EINVAL;
+	}
+
+	return rcar_gen4_cpg_init(cpg_pll_config, CLK_EXTALR, cpg_mode);
+}
+
+const struct cpg_mssr_info r8a779f0_cpg_mssr_info __initconst = {
+	/* Core Clocks */
+	.core_clks = r8a779f0_core_clks,
+	.num_core_clks = ARRAY_SIZE(r8a779f0_core_clks),
+	.last_dt_core_clk = LAST_DT_CORE_CLK,
+	.num_total_core_clks = MOD_CLK_BASE,
+
+	/* Module Clocks */
+	.mod_clks = r8a779f0_mod_clks,
+	.num_mod_clks = ARRAY_SIZE(r8a779f0_mod_clks),
+	.num_hw_mod_clks = 28 * 32,
+
+	/* Callbacks */
+	.init = r8a779f0_cpg_mssr_init,
+	.cpg_clk_register = rcar_gen4_cpg_clk_register,
+
+	.reg_layout = CLK_REG_LAYOUT_RCAR_GEN4,
+};

drivers/clk/renesas/renesas-cpg-mssr.c

@@ -847,6 +847,12 @@ static const struct of_device_id cpg_mssr_match[] = {
 		.compatible = "renesas,r8a779a0-cpg-mssr",
 		.data = &r8a779a0_cpg_mssr_info,
 	},
+#endif
+#ifdef CONFIG_CLK_R8A779F0
+	{
+		.compatible = "renesas,r8a779f0-cpg-mssr",
+		.data = &r8a779f0_cpg_mssr_info,
+	},
 #endif
 	{ /* sentinel */ }
 };

drivers/clk/renesas/renesas-cpg-mssr.h

@@ -178,6 +178,7 @@ extern const struct cpg_mssr_info r8a77980_cpg_mssr_info;
 extern const struct cpg_mssr_info r8a77990_cpg_mssr_info;
 extern const struct cpg_mssr_info r8a77995_cpg_mssr_info;
 extern const struct cpg_mssr_info r8a779a0_cpg_mssr_info;
+extern const struct cpg_mssr_info r8a779f0_cpg_mssr_info;
 
 void __init cpg_mssr_early_init(struct device_node *np,
 				const struct cpg_mssr_info *info);