2 * sh73a0 Core CPG Clocks
4 * Copyright (C) 2014 Ulrich Hecht
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; version 2 of the License.
11 #include <linux/clk-provider.h>
12 #include <linux/clk/renesas.h>
13 #include <linux/init.h>
14 #include <linux/kernel.h>
16 #include <linux/of_address.h>
17 #include <linux/slab.h>
18 #include <linux/spinlock.h>
21 struct clk_onecell_data data;
26 #define CPG_FRQCRA 0x00
27 #define CPG_FRQCRB 0x04
28 #define CPG_SD0CKCR 0x74
29 #define CPG_SD1CKCR 0x78
30 #define CPG_SD2CKCR 0x7c
31 #define CPG_PLLECR 0xd0
32 #define CPG_PLL0CR 0xd8
33 #define CPG_PLL1CR 0x28
34 #define CPG_PLL2CR 0x2c
35 #define CPG_PLL3CR 0xdc
36 #define CPG_CKSCR 0xc0
37 #define CPG_DSI0PHYCR 0x6c
38 #define CPG_DSI1PHYCR 0x70
40 #define CLK_ENABLE_ON_INIT BIT(0)
49 static struct div4_clk div4_clks[] = {
50 { "zg", "pll0", CPG_FRQCRA, 16 },
51 { "m3", "pll1", CPG_FRQCRA, 12 },
52 { "b", "pll1", CPG_FRQCRA, 8 },
53 { "m1", "pll1", CPG_FRQCRA, 4 },
54 { "m2", "pll1", CPG_FRQCRA, 0 },
55 { "zx", "pll1", CPG_FRQCRB, 12 },
56 { "hp", "pll1", CPG_FRQCRB, 4 },
60 static const struct clk_div_table div4_div_table[] = {
61 { 0, 2 }, { 1, 3 }, { 2, 4 }, { 3, 6 }, { 4, 8 }, { 5, 12 },
62 { 6, 16 }, { 7, 18 }, { 8, 24 }, { 10, 36 }, { 11, 48 },
66 static const struct clk_div_table z_div_table[] = {
68 { 0, 1 }, { 1, 1 }, { 2, 1 }, { 3, 1 }, { 4, 1 }, { 5, 1 },
69 { 6, 1 }, { 7, 1 }, { 8, 1 }, { 9, 1 }, { 10, 1 }, { 11, 1 },
70 { 12, 1 }, { 13, 1 }, { 14, 1 }, { 15, 1 },
72 { 16, 2 }, { 17, 3 }, { 18, 4 }, { 19, 6 }, { 20, 8 }, { 21, 12 },
73 { 22, 16 }, { 24, 24 }, { 27, 48 }, { 0, 0 }
76 static struct clk * __init
77 sh73a0_cpg_register_clock(struct device_node *np, struct sh73a0_cpg *cpg,
80 const struct clk_div_table *table = NULL;
81 unsigned int shift, reg, width;
82 const char *parent_name;
83 unsigned int mult = 1;
86 if (!strcmp(name, "main")) {
87 /* extal1, extal1_div2, extal2, extal2_div2 */
88 u32 parent_idx = (clk_readl(cpg->reg + CPG_CKSCR) >> 28) & 3;
90 parent_name = of_clk_get_parent_name(np, parent_idx >> 1);
91 div = (parent_idx & 1) + 1;
92 } else if (!strncmp(name, "pll", 3)) {
93 void __iomem *enable_reg = cpg->reg;
94 u32 enable_bit = name[3] - '0';
99 enable_reg += CPG_PLL0CR;
102 enable_reg += CPG_PLL1CR;
105 enable_reg += CPG_PLL2CR;
108 enable_reg += CPG_PLL3CR;
111 return ERR_PTR(-EINVAL);
113 if (clk_readl(cpg->reg + CPG_PLLECR) & BIT(enable_bit)) {
114 mult = ((clk_readl(enable_reg) >> 24) & 0x3f) + 1;
115 /* handle CFG bit for PLL1 and PLL2 */
116 if (enable_bit == 1 || enable_bit == 2)
117 if (clk_readl(enable_reg) & BIT(20))
120 } else if (!strcmp(name, "dsi0phy") || !strcmp(name, "dsi1phy")) {
121 u32 phy_no = name[3] - '0';
122 void __iomem *dsi_reg = cpg->reg +
123 (phy_no ? CPG_DSI1PHYCR : CPG_DSI0PHYCR);
125 parent_name = phy_no ? "dsi1pck" : "dsi0pck";
126 mult = __raw_readl(dsi_reg);
127 if (!(mult & 0x8000))
130 mult = (mult & 0x3f) + 1;
131 } else if (!strcmp(name, "z")) {
132 parent_name = "pll0";
140 for (c = div4_clks; c->name; c++) {
141 if (!strcmp(name, c->name)) {
142 parent_name = c->parent;
143 table = div4_div_table;
151 return ERR_PTR(-EINVAL);
155 return clk_register_fixed_factor(NULL, name, parent_name, 0,
158 return clk_register_divider_table(NULL, name, parent_name, 0,
159 cpg->reg + reg, shift, width, 0,
164 static void __init sh73a0_cpg_clocks_init(struct device_node *np)
166 struct sh73a0_cpg *cpg;
171 num_clks = of_property_count_strings(np, "clock-output-names");
173 pr_err("%s: failed to count clocks\n", __func__);
177 cpg = kzalloc(sizeof(*cpg), GFP_KERNEL);
178 clks = kcalloc(num_clks, sizeof(*clks), GFP_KERNEL);
179 if (cpg == NULL || clks == NULL) {
180 /* We're leaking memory on purpose, there's no point in cleaning
181 * up as the system won't boot anyway.
186 spin_lock_init(&cpg->lock);
188 cpg->data.clks = clks;
189 cpg->data.clk_num = num_clks;
191 cpg->reg = of_iomap(np, 0);
192 if (WARN_ON(cpg->reg == NULL))
195 /* Set SDHI clocks to a known state */
196 clk_writel(0x108, cpg->reg + CPG_SD0CKCR);
197 clk_writel(0x108, cpg->reg + CPG_SD1CKCR);
198 clk_writel(0x108, cpg->reg + CPG_SD2CKCR);
200 for (i = 0; i < num_clks; ++i) {
204 of_property_read_string_index(np, "clock-output-names", i,
207 clk = sh73a0_cpg_register_clock(np, cpg, name);
209 pr_err("%s: failed to register %s %s clock (%ld)\n",
210 __func__, np->name, name, PTR_ERR(clk));
212 cpg->data.clks[i] = clk;
215 of_clk_add_provider(np, of_clk_src_onecell_get, &cpg->data);
217 CLK_OF_DECLARE(sh73a0_cpg_clks, "renesas,sh73a0-cpg-clocks",
218 sh73a0_cpg_clocks_init);