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8#include <linux/clk-provider.h>
9#include <linux/clk/renesas.h>
10#include <linux/init.h>
11#include <linux/io.h>
12#include <linux/kernel.h>
13#include <linux/of.h>
14#include <linux/of_address.h>
15#include <linux/slab.h>
16#include <linux/spinlock.h>
17
18struct sh73a0_cpg {
19 struct clk_onecell_data data;
20 spinlock_t lock;
21 void __iomem *reg;
22};
23
24#define CPG_FRQCRA 0x00
25#define CPG_FRQCRB 0x04
26#define CPG_SD0CKCR 0x74
27#define CPG_SD1CKCR 0x78
28#define CPG_SD2CKCR 0x7c
29#define CPG_PLLECR 0xd0
30#define CPG_PLL0CR 0xd8
31#define CPG_PLL1CR 0x28
32#define CPG_PLL2CR 0x2c
33#define CPG_PLL3CR 0xdc
34#define CPG_CKSCR 0xc0
35#define CPG_DSI0PHYCR 0x6c
36#define CPG_DSI1PHYCR 0x70
37
38#define CLK_ENABLE_ON_INIT BIT(0)
39
40struct div4_clk {
41 const char *name;
42 const char *parent;
43 unsigned int reg;
44 unsigned int shift;
45};
46
47static const struct div4_clk div4_clks[] = {
48 { "zg", "pll0", CPG_FRQCRA, 16 },
49 { "m3", "pll1", CPG_FRQCRA, 12 },
50 { "b", "pll1", CPG_FRQCRA, 8 },
51 { "m1", "pll1", CPG_FRQCRA, 4 },
52 { "m2", "pll1", CPG_FRQCRA, 0 },
53 { "zx", "pll1", CPG_FRQCRB, 12 },
54 { "hp", "pll1", CPG_FRQCRB, 4 },
55 { NULL, NULL, 0, 0 },
56};
57
58static const struct clk_div_table div4_div_table[] = {
59 { 0, 2 }, { 1, 3 }, { 2, 4 }, { 3, 6 }, { 4, 8 }, { 5, 12 },
60 { 6, 16 }, { 7, 18 }, { 8, 24 }, { 10, 36 }, { 11, 48 },
61 { 12, 7 }, { 0, 0 }
62};
63
64static const struct clk_div_table z_div_table[] = {
65
66 { 0, 1 }, { 1, 1 }, { 2, 1 }, { 3, 1 }, { 4, 1 }, { 5, 1 },
67 { 6, 1 }, { 7, 1 }, { 8, 1 }, { 9, 1 }, { 10, 1 }, { 11, 1 },
68 { 12, 1 }, { 13, 1 }, { 14, 1 }, { 15, 1 },
69
70 { 16, 2 }, { 17, 3 }, { 18, 4 }, { 19, 6 }, { 20, 8 }, { 21, 12 },
71 { 22, 16 }, { 24, 24 }, { 27, 48 }, { 0, 0 }
72};
73
74static struct clk * __init
75sh73a0_cpg_register_clock(struct device_node *np, struct sh73a0_cpg *cpg,
76 const char *name)
77{
78 const struct clk_div_table *table = NULL;
79 unsigned int shift, reg, width;
80 const char *parent_name = NULL;
81 unsigned int mult = 1;
82 unsigned int div = 1;
83
84 if (!strcmp(name, "main")) {
85
86 u32 parent_idx = (readl(cpg->reg + CPG_CKSCR) >> 28) & 3;
87
88 parent_name = of_clk_get_parent_name(np, parent_idx >> 1);
89 div = (parent_idx & 1) + 1;
90 } else if (!strncmp(name, "pll", 3)) {
91 void __iomem *enable_reg = cpg->reg;
92 u32 enable_bit = name[3] - '0';
93
94 parent_name = "main";
95 switch (enable_bit) {
96 case 0:
97 enable_reg += CPG_PLL0CR;
98 break;
99 case 1:
100 enable_reg += CPG_PLL1CR;
101 break;
102 case 2:
103 enable_reg += CPG_PLL2CR;
104 break;
105 case 3:
106 enable_reg += CPG_PLL3CR;
107 break;
108 default:
109 return ERR_PTR(-EINVAL);
110 }
111 if (readl(cpg->reg + CPG_PLLECR) & BIT(enable_bit)) {
112 mult = ((readl(enable_reg) >> 24) & 0x3f) + 1;
113
114 if (enable_bit == 1 || enable_bit == 2)
115 if (readl(enable_reg) & BIT(20))
116 mult *= 2;
117 }
118 } else if (!strcmp(name, "dsi0phy") || !strcmp(name, "dsi1phy")) {
119 u32 phy_no = name[3] - '0';
120 void __iomem *dsi_reg = cpg->reg +
121 (phy_no ? CPG_DSI1PHYCR : CPG_DSI0PHYCR);
122
123 parent_name = phy_no ? "dsi1pck" : "dsi0pck";
124 mult = __raw_readl(dsi_reg);
125 if (!(mult & 0x8000))
126 mult = 1;
127 else
128 mult = (mult & 0x3f) + 1;
129 } else if (!strcmp(name, "z")) {
130 parent_name = "pll0";
131 table = z_div_table;
132 reg = CPG_FRQCRB;
133 shift = 24;
134 width = 5;
135 } else {
136 const struct div4_clk *c;
137
138 for (c = div4_clks; c->name; c++) {
139 if (!strcmp(name, c->name)) {
140 parent_name = c->parent;
141 table = div4_div_table;
142 reg = c->reg;
143 shift = c->shift;
144 width = 4;
145 break;
146 }
147 }
148 if (!c->name)
149 return ERR_PTR(-EINVAL);
150 }
151
152 if (!table) {
153 return clk_register_fixed_factor(NULL, name, parent_name, 0,
154 mult, div);
155 } else {
156 return clk_register_divider_table(NULL, name, parent_name, 0,
157 cpg->reg + reg, shift, width, 0,
158 table, &cpg->lock);
159 }
160}
161
162static void __init sh73a0_cpg_clocks_init(struct device_node *np)
163{
164 struct sh73a0_cpg *cpg;
165 struct clk **clks;
166 unsigned int i;
167 int num_clks;
168
169 num_clks = of_property_count_strings(np, "clock-output-names");
170 if (num_clks < 0) {
171 pr_err("%s: failed to count clocks\n", __func__);
172 return;
173 }
174
175 cpg = kzalloc(sizeof(*cpg), GFP_KERNEL);
176 clks = kcalloc(num_clks, sizeof(*clks), GFP_KERNEL);
177 if (cpg == NULL || clks == NULL) {
178
179
180
181 return;
182 }
183
184 spin_lock_init(&cpg->lock);
185
186 cpg->data.clks = clks;
187 cpg->data.clk_num = num_clks;
188
189 cpg->reg = of_iomap(np, 0);
190 if (WARN_ON(cpg->reg == NULL))
191 return;
192
193
194 writel(0x108, cpg->reg + CPG_SD0CKCR);
195 writel(0x108, cpg->reg + CPG_SD1CKCR);
196 writel(0x108, cpg->reg + CPG_SD2CKCR);
197
198 for (i = 0; i < num_clks; ++i) {
199 const char *name;
200 struct clk *clk;
201
202 of_property_read_string_index(np, "clock-output-names", i,
203 &name);
204
205 clk = sh73a0_cpg_register_clock(np, cpg, name);
206 if (IS_ERR(clk))
207 pr_err("%s: failed to register %pOFn %s clock (%ld)\n",
208 __func__, np, name, PTR_ERR(clk));
209 else
210 cpg->data.clks[i] = clk;
211 }
212
213 of_clk_add_provider(np, of_clk_src_onecell_get, &cpg->data);
214}
215CLK_OF_DECLARE(sh73a0_cpg_clks, "renesas,sh73a0-cpg-clocks",
216 sh73a0_cpg_clocks_init);
217
