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gerrit-public.fairphone.software / kernel / msm-4.9 / 52b084d31cbc8e90cb6fc1ac4061d9a24375c89d / . / drivers / clk / mvebu / armada-39x.c
blob: efb974df9822c454109d8842e2cc080d75222f32 [file] [log] [blame]
Thomas Petazzoni8da6f3c2015-03-03 15:41:09 +0100[diff] [blame]1/*
2 * Marvell Armada 39x SoC clocks
3 *
4 * Copyright (C) 2015 Marvell
5 *
6 * Gregory CLEMENT <gregory.clement@free-electrons.com>
7 * Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
8 * Andrew Lunn <andrew@lunn.ch>
9 * Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
10 *
11 * This file is licensed under the terms of the GNU General Public
12 * License version 2. This program is licensed "as is" without any
13 * warranty of any kind, whether express or implied.
14 */
15
16#include <linux/kernel.h>
17#include <linux/clk-provider.h>
18#include <linux/io.h>
19#include <linux/of.h>
20#include "common.h"
21
22/*
23 * SARL[14:10] : Ratios between CPU, NBCLK, HCLK and DCLK.
24 *
25 * SARL[15] : TCLK frequency
26 * 0 = 250 MHz
27 * 1 = 200 MHz
28 *
29 * SARH[0] : Reference clock frequency
30 * 0 = 25 Mhz
31 * 1 = 40 Mhz
32 */
33
34#define SARL 0
35#define SARL_A390_TCLK_FREQ_OPT 15
36#define SARL_A390_TCLK_FREQ_OPT_MASK 0x1
37#define SARL_A390_CPU_DDR_L2_FREQ_OPT 10
38#define SARL_A390_CPU_DDR_L2_FREQ_OPT_MASK 0x1F
39#define SARH 4
40#define SARH_A390_REFCLK_FREQ BIT(0)
41
42static const u32 armada_39x_tclk_frequencies[] __initconst = {
43 250000000,
44 200000000,
45};
46
47static u32 __init armada_39x_get_tclk_freq(void __iomem *sar)
48{
49 u8 tclk_freq_select;
50
51 tclk_freq_select = ((readl(sar + SARL) >> SARL_A390_TCLK_FREQ_OPT) &
52 SARL_A390_TCLK_FREQ_OPT_MASK);
53 return armada_39x_tclk_frequencies[tclk_freq_select];
54}
55
56static const u32 armada_39x_cpu_frequencies[] __initconst = {
57 [0x0] = 666 * 1000 * 1000,
58 [0x2] = 800 * 1000 * 1000,
59 [0x3] = 800 * 1000 * 1000,
60 [0x4] = 1066 * 1000 * 1000,
61 [0x5] = 1066 * 1000 * 1000,
62 [0x6] = 1200 * 1000 * 1000,
63 [0x8] = 1332 * 1000 * 1000,
64 [0xB] = 1600 * 1000 * 1000,
65 [0xC] = 1600 * 1000 * 1000,
66 [0x12] = 1800 * 1000 * 1000,
67 [0x1E] = 1800 * 1000 * 1000,
68};
69
70static u32 __init armada_39x_get_cpu_freq(void __iomem *sar)
71{
72 u8 cpu_freq_select;
73
74 cpu_freq_select = ((readl(sar + SARL) >> SARL_A390_CPU_DDR_L2_FREQ_OPT) &
75 SARL_A390_CPU_DDR_L2_FREQ_OPT_MASK);
76 if (cpu_freq_select >= ARRAY_SIZE(armada_39x_cpu_frequencies)) {
77 pr_err("Selected CPU frequency (%d) unsupported\n",
78 cpu_freq_select);
79 return 0;
80 }
81
82 return armada_39x_cpu_frequencies[cpu_freq_select];
83}
84
85enum { A390_CPU_TO_NBCLK, A390_CPU_TO_HCLK, A390_CPU_TO_DCLK };
86
87static const struct coreclk_ratio armada_39x_coreclk_ratios[] __initconst = {
88 { .id = A390_CPU_TO_NBCLK, .name = "nbclk" },
89 { .id = A390_CPU_TO_HCLK, .name = "hclk" },
90 { .id = A390_CPU_TO_DCLK, .name = "dclk" },
91};
92
93static void __init armada_39x_get_clk_ratio(
94 void __iomem *sar, int id, int *mult, int *div)
95{
96 switch (id) {
97 case A390_CPU_TO_NBCLK:
98 *mult = 1;
99 *div = 2;
100 break;
101 case A390_CPU_TO_HCLK:
102 *mult = 1;
103 *div = 4;
104 break;
105 case A390_CPU_TO_DCLK:
106 *mult = 1;
107 *div = 2;
108 break;
109 }
110}
111
112static u32 __init armada_39x_refclk_ratio(void __iomem *sar)
113{
114 if (readl(sar + SARH) & SARH_A390_REFCLK_FREQ)
115 return 40 * 1000 * 1000;
116 else
117 return 25 * 1000 * 1000;
118}
119
120static const struct coreclk_soc_desc armada_39x_coreclks = {
121 .get_tclk_freq = armada_39x_get_tclk_freq,
122 .get_cpu_freq = armada_39x_get_cpu_freq,
123 .get_clk_ratio = armada_39x_get_clk_ratio,
124 .get_refclk_freq = armada_39x_refclk_ratio,
125 .ratios = armada_39x_coreclk_ratios,
126 .num_ratios = ARRAY_SIZE(armada_39x_coreclk_ratios),
127};
128
129static void __init armada_39x_coreclk_init(struct device_node *np)
130{
131 mvebu_coreclk_setup(np, &armada_39x_coreclks);
132}
133CLK_OF_DECLARE(armada_39x_core_clk, "marvell,armada-390-core-clock",
134 armada_39x_coreclk_init);
135
136/*
137 * Clock Gating Control
138 */
139static const struct clk_gating_soc_desc armada_39x_gating_desc[] __initconst = {
140 { "pex1", NULL, 5 },
141 { "pex2", NULL, 6 },
142 { "pex3", NULL, 7 },
143 { "pex0", NULL, 8 },
144 { "usb3h0", NULL, 9 },
145 { "sdio", NULL, 17 },
146 { "xor0", NULL, 22 },
147 { "xor1", NULL, 28 },
148 { }
149};
150
151static void __init armada_39x_clk_gating_init(struct device_node *np)
152{
153 mvebu_clk_gating_setup(np, armada_39x_gating_desc);
154}
155CLK_OF_DECLARE(armada_39x_clk_gating, "marvell,armada-390-gating-clock",
156 armada_39x_clk_gating_init);