1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * R7S9210 Clock Pulse Generator / Module Standby
4  *
5  * Based on r8a7795-cpg-mssr.c
6  *
7  * Copyright (C) 2018 Chris Brandt
8  * Copyright (C) 2018 Renesas Electronics Corp.
9  *
10  */
11 
12 #include <linux/clk.h>
13 #include <linux/clk-provider.h>
14 #include <linux/io.h>
15 #include <dt-bindings/clock/r7s9210-cpg-mssr.h>
16 #include "renesas-cpg-mssr.h"
17 
18 #define CPG_FRQCR	0x00
19 
20 static u8 cpg_mode;
21 
22 /* Internal Clock ratio table */
23 static const struct {
24 	unsigned int i;
25 	unsigned int g;
26 	unsigned int b;
27 	unsigned int p1;
28 	/* p0 is always 32 */;
29 } ratio_tab[5] = {	/* I,  G,  B, P1 */
30 			{  2,  4,  8, 16},	/* FRQCR = 0x012 */
31 			{  4,  4,  8, 16},	/* FRQCR = 0x112 */
32 			{  8,  4,  8, 16},	/* FRQCR = 0x212 */
33 			{ 16,  8, 16, 16},	/* FRQCR = 0x322 */
34 			{ 16, 16, 32, 32},	/* FRQCR = 0x333 */
35 			};
36 
37 enum rz_clk_types {
38 	CLK_TYPE_RZA_MAIN = CLK_TYPE_CUSTOM,
39 	CLK_TYPE_RZA_PLL,
40 };
41 
42 enum clk_ids {
43 	/* Core Clock Outputs exported to DT */
44 	LAST_DT_CORE_CLK = R7S9210_CLK_P0,
45 
46 	/* External Input Clocks */
47 	CLK_EXTAL,
48 
49 	/* Internal Core Clocks */
50 	CLK_MAIN,
51 	CLK_PLL,
52 
53 	/* Module Clocks */
54 	MOD_CLK_BASE
55 };
56 
57 static struct cpg_core_clk r7s9210_early_core_clks[] = {
58 	/* External Clock Inputs */
59 	DEF_INPUT("extal",     CLK_EXTAL),
60 
61 	/* Internal Core Clocks */
62 	DEF_BASE(".main",       CLK_MAIN, CLK_TYPE_RZA_MAIN, CLK_EXTAL),
63 	DEF_BASE(".pll",       CLK_PLL, CLK_TYPE_RZA_PLL, CLK_MAIN),
64 
65 	/* Core Clock Outputs */
66 	DEF_FIXED("p1c",    R7S9210_CLK_P1C,   CLK_PLL,         16, 1),
67 };
68 
69 static const struct mssr_mod_clk r7s9210_early_mod_clks[] __initconst = {
70 	DEF_MOD_STB("ostm2",	 34,	R7S9210_CLK_P1C),
71 	DEF_MOD_STB("ostm1",	 35,	R7S9210_CLK_P1C),
72 	DEF_MOD_STB("ostm0",	 36,	R7S9210_CLK_P1C),
73 };
74 
75 static struct cpg_core_clk r7s9210_core_clks[] = {
76 	/* Core Clock Outputs */
77 	DEF_FIXED("i",      R7S9210_CLK_I,     CLK_PLL,          2, 1),
78 	DEF_FIXED("g",      R7S9210_CLK_G,     CLK_PLL,          4, 1),
79 	DEF_FIXED("b",      R7S9210_CLK_B,     CLK_PLL,          8, 1),
80 	DEF_FIXED("p1",     R7S9210_CLK_P1,    CLK_PLL,         16, 1),
81 	DEF_FIXED("p0",     R7S9210_CLK_P0,    CLK_PLL,         32, 1),
82 };
83 
84 static const struct mssr_mod_clk r7s9210_mod_clks[] __initconst = {
85 	DEF_MOD_STB("scif4",	 43,	R7S9210_CLK_P1C),
86 	DEF_MOD_STB("scif3",	 44,	R7S9210_CLK_P1C),
87 	DEF_MOD_STB("scif2",	 45,	R7S9210_CLK_P1C),
88 	DEF_MOD_STB("scif1",	 46,	R7S9210_CLK_P1C),
89 	DEF_MOD_STB("scif0",	 47,	R7S9210_CLK_P1C),
90 
91 	DEF_MOD_STB("usb1",	 60,	R7S9210_CLK_B),
92 	DEF_MOD_STB("usb0",	 61,	R7S9210_CLK_B),
93 	DEF_MOD_STB("ether1",	 64,	R7S9210_CLK_B),
94 	DEF_MOD_STB("ether0",	 65,	R7S9210_CLK_B),
95 
96 	DEF_MOD_STB("spibsc",	 83,	R7S9210_CLK_P1),
97 	DEF_MOD_STB("i2c3",	 84,	R7S9210_CLK_P1),
98 	DEF_MOD_STB("i2c2",	 85,	R7S9210_CLK_P1),
99 	DEF_MOD_STB("i2c1",	 86,	R7S9210_CLK_P1),
100 	DEF_MOD_STB("i2c0",	 87,	R7S9210_CLK_P1),
101 
102 	DEF_MOD_STB("spi2",	 95,	R7S9210_CLK_P1),
103 	DEF_MOD_STB("spi1",	 96,	R7S9210_CLK_P1),
104 	DEF_MOD_STB("spi0",	 97,	R7S9210_CLK_P1),
105 
106 	DEF_MOD_STB("sdhi11",	100,	R7S9210_CLK_B),
107 	DEF_MOD_STB("sdhi10",	101,	R7S9210_CLK_B),
108 	DEF_MOD_STB("sdhi01",	102,	R7S9210_CLK_B),
109 	DEF_MOD_STB("sdhi00",	103,	R7S9210_CLK_B),
110 };
111 
112 /* The clock dividers in the table vary based on DT and register settings */
113 static void __init r7s9210_update_clk_table(struct clk *extal_clk,
114 					    void __iomem *base)
115 {
116 	int i;
117 	u16 frqcr;
118 	u8 index;
119 
120 	/* If EXTAL is above 12MHz, then we know it is Mode 1 */
121 	if (clk_get_rate(extal_clk) > 12000000)
122 		cpg_mode = 1;
123 
124 	frqcr = readl(base + CPG_FRQCR) & 0xFFF;
125 	if (frqcr == 0x012)
126 		index = 0;
127 	else if (frqcr == 0x112)
128 		index = 1;
129 	else if (frqcr == 0x212)
130 		index = 2;
131 	else if (frqcr == 0x322)
132 		index = 3;
133 	else if (frqcr == 0x333)
134 		index = 4;
135 	else
136 		BUG_ON(1);	/* Illegal FRQCR value */
137 
138 	for (i = 0; i < ARRAY_SIZE(r7s9210_core_clks); i++) {
139 		switch (r7s9210_core_clks[i].id) {
140 		case R7S9210_CLK_I:
141 			r7s9210_core_clks[i].div = ratio_tab[index].i;
142 			break;
143 		case R7S9210_CLK_G:
144 			r7s9210_core_clks[i].div = ratio_tab[index].g;
145 			break;
146 		case R7S9210_CLK_B:
147 			r7s9210_core_clks[i].div = ratio_tab[index].b;
148 			break;
149 		case R7S9210_CLK_P1:
150 		case R7S9210_CLK_P1C:
151 			r7s9210_core_clks[i].div = ratio_tab[index].p1;
152 			break;
153 		case R7S9210_CLK_P0:
154 			r7s9210_core_clks[i].div = 32;
155 			break;
156 		}
157 	}
158 }
159 
160 static struct clk * __init rza2_cpg_clk_register(struct device *dev,
161 	const struct cpg_core_clk *core, const struct cpg_mssr_info *info,
162 	struct clk **clks, void __iomem *base,
163 	struct raw_notifier_head *notifiers)
164 {
165 	struct clk *parent;
166 	unsigned int mult = 1;
167 	unsigned int div = 1;
168 
169 	parent = clks[core->parent];
170 	if (IS_ERR(parent))
171 		return ERR_CAST(parent);
172 
173 	switch (core->id) {
174 	case CLK_MAIN:
175 		break;
176 
177 	case CLK_PLL:
178 		if (cpg_mode)
179 			mult = 44;	/* Divider 1 is 1/2 */
180 		else
181 			mult = 88;	/* Divider 1 is 1 */
182 		break;
183 
184 	default:
185 		return ERR_PTR(-EINVAL);
186 	}
187 
188 	if (core->id == CLK_MAIN)
189 		r7s9210_update_clk_table(parent, base);
190 
191 	return clk_register_fixed_factor(NULL, core->name,
192 					 __clk_get_name(parent), 0, mult, div);
193 }
194 
195 const struct cpg_mssr_info r7s9210_cpg_mssr_info __initconst = {
196 	/* Early Clocks */
197 	.early_core_clks = r7s9210_early_core_clks,
198 	.num_early_core_clks = ARRAY_SIZE(r7s9210_early_core_clks),
199 	.early_mod_clks = r7s9210_early_mod_clks,
200 	.num_early_mod_clks = ARRAY_SIZE(r7s9210_early_mod_clks),
201 
202 	/* Core Clocks */
203 	.core_clks = r7s9210_core_clks,
204 	.num_core_clks = ARRAY_SIZE(r7s9210_core_clks),
205 	.last_dt_core_clk = LAST_DT_CORE_CLK,
206 	.num_total_core_clks = MOD_CLK_BASE,
207 
208 	/* Module Clocks */
209 	.mod_clks = r7s9210_mod_clks,
210 	.num_mod_clks = ARRAY_SIZE(r7s9210_mod_clks),
211 	.num_hw_mod_clks = 11 * 32, /* includes STBCR0 which doesn't exist */
212 
213 	/* Callbacks */
214 	.cpg_clk_register = rza2_cpg_clk_register,
215 
216 	/* RZ/A2 has Standby Control Registers */
217 	.stbyctrl = true,
218 };
219 
220 static void __init r7s9210_cpg_mssr_early_init(struct device_node *np)
221 {
222 	cpg_mssr_early_init(np, &r7s9210_cpg_mssr_info);
223 }
224 
225 CLK_OF_DECLARE_DRIVER(cpg_mstp_clks, "renesas,r7s9210-cpg-mssr",
226 		      r7s9210_cpg_mssr_early_init);
227