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9e288cef | 1 | // SPDX-License-Identifier: GPL-2.0 |
ae073881 UH |
2 | /* |
3 | * sh73a0 Core CPG Clocks | |
4 | * | |
5 | * Copyright (C) 2014 Ulrich Hecht | |
ae073881 UH |
6 | */ |
7 | ||
8 | #include <linux/clk-provider.h> | |
09c32427 | 9 | #include <linux/clk/renesas.h> |
ae073881 UH |
10 | #include <linux/init.h> |
11 | #include <linux/kernel.h> | |
12 | #include <linux/of.h> | |
13 | #include <linux/of_address.h> | |
5a1cfafa | 14 | #include <linux/slab.h> |
ae073881 UH |
15 | #include <linux/spinlock.h> |
16 | ||
17 | struct sh73a0_cpg { | |
18 | struct clk_onecell_data data; | |
19 | spinlock_t lock; | |
20 | void __iomem *reg; | |
21 | }; | |
22 | ||
23 | #define CPG_FRQCRA 0x00 | |
24 | #define CPG_FRQCRB 0x04 | |
25 | #define CPG_SD0CKCR 0x74 | |
26 | #define CPG_SD1CKCR 0x78 | |
27 | #define CPG_SD2CKCR 0x7c | |
28 | #define CPG_PLLECR 0xd0 | |
29 | #define CPG_PLL0CR 0xd8 | |
30 | #define CPG_PLL1CR 0x28 | |
31 | #define CPG_PLL2CR 0x2c | |
32 | #define CPG_PLL3CR 0xdc | |
33 | #define CPG_CKSCR 0xc0 | |
34 | #define CPG_DSI0PHYCR 0x6c | |
35 | #define CPG_DSI1PHYCR 0x70 | |
36 | ||
37 | #define CLK_ENABLE_ON_INIT BIT(0) | |
38 | ||
39 | struct div4_clk { | |
40 | const char *name; | |
41 | const char *parent; | |
42 | unsigned int reg; | |
43 | unsigned int shift; | |
44 | }; | |
45 | ||
ce33f284 | 46 | static const struct div4_clk div4_clks[] = { |
ae073881 UH |
47 | { "zg", "pll0", CPG_FRQCRA, 16 }, |
48 | { "m3", "pll1", CPG_FRQCRA, 12 }, | |
49 | { "b", "pll1", CPG_FRQCRA, 8 }, | |
50 | { "m1", "pll1", CPG_FRQCRA, 4 }, | |
51 | { "m2", "pll1", CPG_FRQCRA, 0 }, | |
52 | { "zx", "pll1", CPG_FRQCRB, 12 }, | |
53 | { "hp", "pll1", CPG_FRQCRB, 4 }, | |
16bd794f | 54 | { NULL, NULL, 0, 0 }, |
ae073881 UH |
55 | }; |
56 | ||
57 | static const struct clk_div_table div4_div_table[] = { | |
58 | { 0, 2 }, { 1, 3 }, { 2, 4 }, { 3, 6 }, { 4, 8 }, { 5, 12 }, | |
59 | { 6, 16 }, { 7, 18 }, { 8, 24 }, { 10, 36 }, { 11, 48 }, | |
60 | { 12, 7 }, { 0, 0 } | |
61 | }; | |
62 | ||
63 | static const struct clk_div_table z_div_table[] = { | |
64 | /* ZSEL == 0 */ | |
65 | { 0, 1 }, { 1, 1 }, { 2, 1 }, { 3, 1 }, { 4, 1 }, { 5, 1 }, | |
66 | { 6, 1 }, { 7, 1 }, { 8, 1 }, { 9, 1 }, { 10, 1 }, { 11, 1 }, | |
67 | { 12, 1 }, { 13, 1 }, { 14, 1 }, { 15, 1 }, | |
68 | /* ZSEL == 1 */ | |
69 | { 16, 2 }, { 17, 3 }, { 18, 4 }, { 19, 6 }, { 20, 8 }, { 21, 12 }, | |
70 | { 22, 16 }, { 24, 24 }, { 27, 48 }, { 0, 0 } | |
71 | }; | |
72 | ||
73 | static struct clk * __init | |
74 | sh73a0_cpg_register_clock(struct device_node *np, struct sh73a0_cpg *cpg, | |
75 | const char *name) | |
76 | { | |
77 | const struct clk_div_table *table = NULL; | |
78 | unsigned int shift, reg, width; | |
ce33f284 | 79 | const char *parent_name = NULL; |
ae073881 UH |
80 | unsigned int mult = 1; |
81 | unsigned int div = 1; | |
82 | ||
83 | if (!strcmp(name, "main")) { | |
84 | /* extal1, extal1_div2, extal2, extal2_div2 */ | |
f046d6a6 | 85 | u32 parent_idx = (readl(cpg->reg + CPG_CKSCR) >> 28) & 3; |
ae073881 UH |
86 | |
87 | parent_name = of_clk_get_parent_name(np, parent_idx >> 1); | |
88 | div = (parent_idx & 1) + 1; | |
89 | } else if (!strncmp(name, "pll", 3)) { | |
90 | void __iomem *enable_reg = cpg->reg; | |
91 | u32 enable_bit = name[3] - '0'; | |
92 | ||
93 | parent_name = "main"; | |
94 | switch (enable_bit) { | |
95 | case 0: | |
96 | enable_reg += CPG_PLL0CR; | |
97 | break; | |
98 | case 1: | |
99 | enable_reg += CPG_PLL1CR; | |
100 | break; | |
101 | case 2: | |
102 | enable_reg += CPG_PLL2CR; | |
103 | break; | |
104 | case 3: | |
105 | enable_reg += CPG_PLL3CR; | |
106 | break; | |
107 | default: | |
108 | return ERR_PTR(-EINVAL); | |
109 | } | |
f046d6a6 GU |
110 | if (readl(cpg->reg + CPG_PLLECR) & BIT(enable_bit)) { |
111 | mult = ((readl(enable_reg) >> 24) & 0x3f) + 1; | |
ae073881 UH |
112 | /* handle CFG bit for PLL1 and PLL2 */ |
113 | if (enable_bit == 1 || enable_bit == 2) | |
f046d6a6 | 114 | if (readl(enable_reg) & BIT(20)) |
ae073881 UH |
115 | mult *= 2; |
116 | } | |
117 | } else if (!strcmp(name, "dsi0phy") || !strcmp(name, "dsi1phy")) { | |
118 | u32 phy_no = name[3] - '0'; | |
119 | void __iomem *dsi_reg = cpg->reg + | |
120 | (phy_no ? CPG_DSI1PHYCR : CPG_DSI0PHYCR); | |
121 | ||
122 | parent_name = phy_no ? "dsi1pck" : "dsi0pck"; | |
123 | mult = __raw_readl(dsi_reg); | |
124 | if (!(mult & 0x8000)) | |
125 | mult = 1; | |
126 | else | |
127 | mult = (mult & 0x3f) + 1; | |
128 | } else if (!strcmp(name, "z")) { | |
129 | parent_name = "pll0"; | |
130 | table = z_div_table; | |
131 | reg = CPG_FRQCRB; | |
132 | shift = 24; | |
133 | width = 5; | |
134 | } else { | |
ce33f284 | 135 | const struct div4_clk *c; |
ae073881 UH |
136 | |
137 | for (c = div4_clks; c->name; c++) { | |
138 | if (!strcmp(name, c->name)) { | |
139 | parent_name = c->parent; | |
140 | table = div4_div_table; | |
141 | reg = c->reg; | |
142 | shift = c->shift; | |
143 | width = 4; | |
144 | break; | |
145 | } | |
146 | } | |
147 | if (!c->name) | |
148 | return ERR_PTR(-EINVAL); | |
149 | } | |
150 | ||
151 | if (!table) { | |
152 | return clk_register_fixed_factor(NULL, name, parent_name, 0, | |
153 | mult, div); | |
154 | } else { | |
155 | return clk_register_divider_table(NULL, name, parent_name, 0, | |
156 | cpg->reg + reg, shift, width, 0, | |
157 | table, &cpg->lock); | |
158 | } | |
159 | } | |
160 | ||
161 | static void __init sh73a0_cpg_clocks_init(struct device_node *np) | |
162 | { | |
163 | struct sh73a0_cpg *cpg; | |
164 | struct clk **clks; | |
165 | unsigned int i; | |
166 | int num_clks; | |
167 | ||
168 | num_clks = of_property_count_strings(np, "clock-output-names"); | |
169 | if (num_clks < 0) { | |
170 | pr_err("%s: failed to count clocks\n", __func__); | |
171 | return; | |
172 | } | |
173 | ||
174 | cpg = kzalloc(sizeof(*cpg), GFP_KERNEL); | |
175 | clks = kcalloc(num_clks, sizeof(*clks), GFP_KERNEL); | |
176 | if (cpg == NULL || clks == NULL) { | |
177 | /* We're leaking memory on purpose, there's no point in cleaning | |
178 | * up as the system won't boot anyway. | |
179 | */ | |
180 | return; | |
181 | } | |
182 | ||
183 | spin_lock_init(&cpg->lock); | |
184 | ||
185 | cpg->data.clks = clks; | |
186 | cpg->data.clk_num = num_clks; | |
187 | ||
188 | cpg->reg = of_iomap(np, 0); | |
189 | if (WARN_ON(cpg->reg == NULL)) | |
190 | return; | |
191 | ||
192 | /* Set SDHI clocks to a known state */ | |
f046d6a6 GU |
193 | writel(0x108, cpg->reg + CPG_SD0CKCR); |
194 | writel(0x108, cpg->reg + CPG_SD1CKCR); | |
195 | writel(0x108, cpg->reg + CPG_SD2CKCR); | |
ae073881 UH |
196 | |
197 | for (i = 0; i < num_clks; ++i) { | |
198 | const char *name; | |
199 | struct clk *clk; | |
200 | ||
201 | of_property_read_string_index(np, "clock-output-names", i, | |
202 | &name); | |
203 | ||
204 | clk = sh73a0_cpg_register_clock(np, cpg, name); | |
205 | if (IS_ERR(clk)) | |
e665f029 RH |
206 | pr_err("%s: failed to register %pOFn %s clock (%ld)\n", |
207 | __func__, np, name, PTR_ERR(clk)); | |
ae073881 UH |
208 | else |
209 | cpg->data.clks[i] = clk; | |
210 | } | |
211 | ||
212 | of_clk_add_provider(np, of_clk_src_onecell_get, &cpg->data); | |
213 | } | |
214 | CLK_OF_DECLARE(sh73a0_cpg_clks, "renesas,sh73a0-cpg-clocks", | |
215 | sh73a0_cpg_clocks_init); |