1
2
3
4
5
6
7
8
9
10
11#include <linux/clk-provider.h>
12#include <linux/clk/renesas.h>
13#include <linux/init.h>
14#include <linux/kernel.h>
15#include <linux/slab.h>
16#include <linux/of.h>
17#include <linux/of_address.h>
18#include <linux/spinlock.h>
19
20struct r8a7740_cpg {
21 struct clk_onecell_data data;
22 spinlock_t lock;
23 void __iomem *reg;
24};
25
26#define CPG_FRQCRA 0x00
27#define CPG_FRQCRB 0x04
28#define CPG_PLLC2CR 0x2c
29#define CPG_USBCKCR 0x8c
30#define CPG_FRQCRC 0xe0
31
32#define CLK_ENABLE_ON_INIT BIT(0)
33
34struct div4_clk {
35 const char *name;
36 unsigned int reg;
37 unsigned int shift;
38 int flags;
39};
40
41static struct div4_clk div4_clks[] = {
42 { "i", CPG_FRQCRA, 20, CLK_ENABLE_ON_INIT },
43 { "zg", CPG_FRQCRA, 16, CLK_ENABLE_ON_INIT },
44 { "b", CPG_FRQCRA, 8, CLK_ENABLE_ON_INIT },
45 { "m1", CPG_FRQCRA, 4, CLK_ENABLE_ON_INIT },
46 { "hp", CPG_FRQCRB, 4, 0 },
47 { "hpp", CPG_FRQCRC, 20, 0 },
48 { "usbp", CPG_FRQCRC, 16, 0 },
49 { "s", CPG_FRQCRC, 12, 0 },
50 { "zb", CPG_FRQCRC, 8, 0 },
51 { "m3", CPG_FRQCRC, 4, 0 },
52 { "cp", CPG_FRQCRC, 0, 0 },
53 { NULL, 0, 0, 0 },
54};
55
56static const struct clk_div_table div4_div_table[] = {
57 { 0, 2 }, { 1, 3 }, { 2, 4 }, { 3, 6 }, { 4, 8 }, { 5, 12 },
58 { 6, 16 }, { 7, 18 }, { 8, 24 }, { 9, 32 }, { 10, 36 }, { 11, 48 },
59 { 13, 72 }, { 14, 96 }, { 0, 0 }
60};
61
62static u32 cpg_mode __initdata;
63
64static struct clk * __init
65r8a7740_cpg_register_clock(struct device_node *np, struct r8a7740_cpg *cpg,
66 const char *name)
67{
68 const struct clk_div_table *table = NULL;
69 const char *parent_name;
70 unsigned int shift, reg;
71 unsigned int mult = 1;
72 unsigned int div = 1;
73
74 if (!strcmp(name, "r")) {
75 switch (cpg_mode & (BIT(2) | BIT(1))) {
76 case BIT(1) | BIT(2):
77
78 parent_name = of_clk_get_parent_name(np, 0);
79 div = 2048;
80 break;
81 case BIT(2):
82
83 parent_name = of_clk_get_parent_name(np, 0);
84 div = 1024;
85 break;
86 default:
87
88 parent_name = of_clk_get_parent_name(np, 2);
89 break;
90 }
91 } else if (!strcmp(name, "system")) {
92 parent_name = of_clk_get_parent_name(np, 0);
93 if (cpg_mode & BIT(1))
94 div = 2;
95 } else if (!strcmp(name, "pllc0")) {
96
97
98
99
100
101 u32 value = clk_readl(cpg->reg + CPG_FRQCRC);
102 parent_name = "system";
103 mult = ((value >> 24) & 0x7f) + 1;
104 } else if (!strcmp(name, "pllc1")) {
105 u32 value = clk_readl(cpg->reg + CPG_FRQCRA);
106 parent_name = "system";
107 mult = ((value >> 24) & 0x7f) + 1;
108 div = 2;
109 } else if (!strcmp(name, "pllc2")) {
110 u32 value = clk_readl(cpg->reg + CPG_PLLC2CR);
111 parent_name = "system";
112 mult = ((value >> 24) & 0x3f) + 1;
113 } else if (!strcmp(name, "usb24s")) {
114 u32 value = clk_readl(cpg->reg + CPG_USBCKCR);
115 if (value & BIT(7))
116
117 parent_name = of_clk_get_parent_name(np, 1);
118 else
119 parent_name = "system";
120 if (!(value & BIT(6)))
121 div = 2;
122 } else {
123 struct div4_clk *c;
124 for (c = div4_clks; c->name; c++) {
125 if (!strcmp(name, c->name)) {
126 parent_name = "pllc1";
127 table = div4_div_table;
128 reg = c->reg;
129 shift = c->shift;
130 break;
131 }
132 }
133 if (!c->name)
134 return ERR_PTR(-EINVAL);
135 }
136
137 if (!table) {
138 return clk_register_fixed_factor(NULL, name, parent_name, 0,
139 mult, div);
140 } else {
141 return clk_register_divider_table(NULL, name, parent_name, 0,
142 cpg->reg + reg, shift, 4, 0,
143 table, &cpg->lock);
144 }
145}
146
147static void __init r8a7740_cpg_clocks_init(struct device_node *np)
148{
149 struct r8a7740_cpg *cpg;
150 struct clk **clks;
151 unsigned int i;
152 int num_clks;
153
154 if (of_property_read_u32(np, "renesas,mode", &cpg_mode))
155 pr_warn("%s: missing renesas,mode property\n", __func__);
156
157 num_clks = of_property_count_strings(np, "clock-output-names");
158 if (num_clks < 0) {
159 pr_err("%s: failed to count clocks\n", __func__);
160 return;
161 }
162
163 cpg = kzalloc(sizeof(*cpg), GFP_KERNEL);
164 clks = kzalloc(num_clks * sizeof(*clks), GFP_KERNEL);
165 if (cpg == NULL || clks == NULL) {
166
167
168
169 return;
170 }
171
172 spin_lock_init(&cpg->lock);
173
174 cpg->data.clks = clks;
175 cpg->data.clk_num = num_clks;
176
177 cpg->reg = of_iomap(np, 0);
178 if (WARN_ON(cpg->reg == NULL))
179 return;
180
181 for (i = 0; i < num_clks; ++i) {
182 const char *name;
183 struct clk *clk;
184
185 of_property_read_string_index(np, "clock-output-names", i,
186 &name);
187
188 clk = r8a7740_cpg_register_clock(np, cpg, name);
189 if (IS_ERR(clk))
190 pr_err("%s: failed to register %s %s clock (%ld)\n",
191 __func__, np->name, name, PTR_ERR(clk));
192 else
193 cpg->data.clks[i] = clk;
194 }
195
196 of_clk_add_provider(np, of_clk_src_onecell_get, &cpg->data);
197}
198CLK_OF_DECLARE(r8a7740_cpg_clks, "renesas,r8a7740-cpg-clocks",
199 r8a7740_cpg_clocks_init);
200
