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