1 /*
2 * Copyright (c) 2013 Samsung Electronics Co., Ltd.
3 * Author: Thomas Abraham <thomas.ab@samsung.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 *
9 * Common Clock Framework support for Exynos5440 SoC.
10 */
11
12 #include <dt-bindings/clock/exynos5440.h>
13 #include <linux/clk-provider.h>
14 #include <linux/of.h>
15 #include <linux/of_address.h>
16 #include <linux/notifier.h>
17 #include <linux/reboot.h>
18
19 #include "clk.h"
20 #include "clk-pll.h"
21
22 #define CLKEN_OV_VAL 0xf8
23 #define CPU_CLK_STATUS 0xfc
24 #define MISC_DOUT1 0x558
25
26 static void __iomem *reg_base;
27
28 /* parent clock name list */
29 PNAME(mout_armclk_p) = { "cplla", "cpllb" };
30 PNAME(mout_spi_p) = { "div125", "div200" };
31
32 /* fixed rate clocks generated outside the soc */
33 static struct samsung_fixed_rate_clock exynos5440_fixed_rate_ext_clks[] __initdata = {
34 FRATE(0, "xtal", NULL, CLK_IS_ROOT, 0),
35 };
36
37 /* fixed rate clocks */
38 static struct samsung_fixed_rate_clock exynos5440_fixed_rate_clks[] __initdata = {
39 FRATE(0, "ppll", NULL, CLK_IS_ROOT, 1000000000),
40 FRATE(0, "usb_phy0", NULL, CLK_IS_ROOT, 60000000),
41 FRATE(0, "usb_phy1", NULL, CLK_IS_ROOT, 60000000),
42 FRATE(0, "usb_ohci12", NULL, CLK_IS_ROOT, 12000000),
43 FRATE(0, "usb_ohci48", NULL, CLK_IS_ROOT, 48000000),
44 };
45
46 /* fixed factor clocks */
47 static struct samsung_fixed_factor_clock exynos5440_fixed_factor_clks[] __initdata = {
48 FFACTOR(0, "div250", "ppll", 1, 4, 0),
49 FFACTOR(0, "div200", "ppll", 1, 5, 0),
50 FFACTOR(0, "div125", "div250", 1, 2, 0),
51 };
52
53 /* mux clocks */
54 static struct samsung_mux_clock exynos5440_mux_clks[] __initdata = {
55 MUX(0, "mout_spi", mout_spi_p, MISC_DOUT1, 5, 1),
56 MUX_A(CLK_ARM_CLK, "arm_clk", mout_armclk_p,
57 CPU_CLK_STATUS, 0, 1, "armclk"),
58 };
59
60 /* divider clocks */
61 static struct samsung_div_clock exynos5440_div_clks[] __initdata = {
62 DIV(CLK_SPI_BAUD, "div_spi", "mout_spi", MISC_DOUT1, 3, 2),
63 };
64
65 /* gate clocks */
66 static struct samsung_gate_clock exynos5440_gate_clks[] __initdata = {
67 GATE(CLK_PB0_250, "pb0_250", "div250", CLKEN_OV_VAL, 3, 0, 0),
68 GATE(CLK_PR0_250, "pr0_250", "div250", CLKEN_OV_VAL, 4, 0, 0),
69 GATE(CLK_PR1_250, "pr1_250", "div250", CLKEN_OV_VAL, 5, 0, 0),
70 GATE(CLK_B_250, "b_250", "div250", CLKEN_OV_VAL, 9, 0, 0),
71 GATE(CLK_B_125, "b_125", "div125", CLKEN_OV_VAL, 10, 0, 0),
72 GATE(CLK_B_200, "b_200", "div200", CLKEN_OV_VAL, 11, 0, 0),
73 GATE(CLK_SATA, "sata", "div200", CLKEN_OV_VAL, 12, 0, 0),
74 GATE(CLK_USB, "usb", "div200", CLKEN_OV_VAL, 13, 0, 0),
75 GATE(CLK_GMAC0, "gmac0", "div200", CLKEN_OV_VAL, 14, 0, 0),
76 GATE(CLK_CS250, "cs250", "div250", CLKEN_OV_VAL, 19, 0, 0),
77 GATE(CLK_PB0_250_O, "pb0_250_o", "pb0_250", CLKEN_OV_VAL, 3, 0, 0),
78 GATE(CLK_PR0_250_O, "pr0_250_o", "pr0_250", CLKEN_OV_VAL, 4, 0, 0),
79 GATE(CLK_PR1_250_O, "pr1_250_o", "pr1_250", CLKEN_OV_VAL, 5, 0, 0),
80 GATE(CLK_B_250_O, "b_250_o", "b_250", CLKEN_OV_VAL, 9, 0, 0),
81 GATE(CLK_B_125_O, "b_125_o", "b_125", CLKEN_OV_VAL, 10, 0, 0),
82 GATE(CLK_B_200_O, "b_200_o", "b_200", CLKEN_OV_VAL, 11, 0, 0),
83 GATE(CLK_SATA_O, "sata_o", "sata", CLKEN_OV_VAL, 12, 0, 0),
84 GATE(CLK_USB_O, "usb_o", "usb", CLKEN_OV_VAL, 13, 0, 0),
85 GATE(CLK_GMAC0_O, "gmac0_o", "gmac", CLKEN_OV_VAL, 14, 0, 0),
86 GATE(CLK_CS250_O, "cs250_o", "cs250", CLKEN_OV_VAL, 19, 0, 0),
87 };
88
89 static const struct of_device_id ext_clk_match[] __initconst = {
90 { .compatible = "samsung,clock-xtal", .data = (void *)0, },
91 {},
92 };
93
exynos5440_clk_restart_notify(struct notifier_block * this,unsigned long code,void * unused)94 static int exynos5440_clk_restart_notify(struct notifier_block *this,
95 unsigned long code, void *unused)
96 {
97 u32 val, status;
98
99 status = readl_relaxed(reg_base + 0xbc);
100 val = readl_relaxed(reg_base + 0xcc);
101 val = (val & 0xffff0000) | (status & 0xffff);
102 writel_relaxed(val, reg_base + 0xcc);
103
104 return NOTIFY_DONE;
105 }
106
107 /*
108 * Exynos5440 Clock restart notifier, handles restart functionality
109 */
110 static struct notifier_block exynos5440_clk_restart_handler = {
111 .notifier_call = exynos5440_clk_restart_notify,
112 .priority = 128,
113 };
114
115 /* register exynos5440 clocks */
exynos5440_clk_init(struct device_node * np)116 static void __init exynos5440_clk_init(struct device_node *np)
117 {
118 struct samsung_clk_provider *ctx;
119
120 reg_base = of_iomap(np, 0);
121 if (!reg_base) {
122 pr_err("%s: failed to map clock controller registers,"
123 " aborting clock initialization\n", __func__);
124 return;
125 }
126
127 ctx = samsung_clk_init(np, reg_base, CLK_NR_CLKS);
128 if (!ctx)
129 panic("%s: unable to allocate context.\n", __func__);
130
131 samsung_clk_of_register_fixed_ext(ctx, exynos5440_fixed_rate_ext_clks,
132 ARRAY_SIZE(exynos5440_fixed_rate_ext_clks), ext_clk_match);
133
134 samsung_clk_register_pll2550x("cplla", "xtal", reg_base + 0x1c, 0x10);
135 samsung_clk_register_pll2550x("cpllb", "xtal", reg_base + 0x20, 0x10);
136
137 samsung_clk_register_fixed_rate(ctx, exynos5440_fixed_rate_clks,
138 ARRAY_SIZE(exynos5440_fixed_rate_clks));
139 samsung_clk_register_fixed_factor(ctx, exynos5440_fixed_factor_clks,
140 ARRAY_SIZE(exynos5440_fixed_factor_clks));
141 samsung_clk_register_mux(ctx, exynos5440_mux_clks,
142 ARRAY_SIZE(exynos5440_mux_clks));
143 samsung_clk_register_div(ctx, exynos5440_div_clks,
144 ARRAY_SIZE(exynos5440_div_clks));
145 samsung_clk_register_gate(ctx, exynos5440_gate_clks,
146 ARRAY_SIZE(exynos5440_gate_clks));
147
148 samsung_clk_of_add_provider(np, ctx);
149
150 if (register_restart_handler(&exynos5440_clk_restart_handler))
151 pr_warn("exynos5440 clock can't register restart handler\n");
152
153 pr_info("Exynos5440: arm_clk = %ldHz\n", _get_rate("arm_clk"));
154 pr_info("exynos5440 clock initialization complete\n");
155 }
156 CLK_OF_DECLARE(exynos5440_clk, "samsung,exynos5440-clock", exynos5440_clk_init);
157