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Sebastian Hesselbarth5d840162013-05-11 03:08:03 +02001/*
2 * Marvell Dove SoC clocks
3 *
4 * Copyright (C) 2012 Marvell
5 *
6 * Gregory CLEMENT <gregory.clement@free-electrons.com>
7 * Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
8 * Andrew Lunn <andrew@lunn.ch>
9 *
10 * This file is licensed under the terms of the GNU General Public
11 * License version 2. This program is licensed "as is" without any
12 * warranty of any kind, whether express or implied.
13 */
14
15#include <linux/kernel.h>
16#include <linux/clk-provider.h>
17#include <linux/io.h>
18#include <linux/of.h>
19#include "common.h"
20
21/*
22 * Core Clocks
23 *
24 * Dove PLL sample-at-reset configuration
25 *
26 * SAR0[8:5] : CPU frequency
27 * 5 = 1000 MHz
28 * 6 = 933 MHz
29 * 7 = 933 MHz
30 * 8 = 800 MHz
31 * 9 = 800 MHz
32 * 10 = 800 MHz
33 * 11 = 1067 MHz
34 * 12 = 667 MHz
35 * 13 = 533 MHz
36 * 14 = 400 MHz
37 * 15 = 333 MHz
38 * others reserved.
39 *
40 * SAR0[11:9] : CPU to L2 Clock divider ratio
41 * 0 = (1/1) * CPU
42 * 2 = (1/2) * CPU
43 * 4 = (1/3) * CPU
44 * 6 = (1/4) * CPU
45 * others reserved.
46 *
47 * SAR0[15:12] : CPU to DDR DRAM Clock divider ratio
48 * 0 = (1/1) * CPU
49 * 2 = (1/2) * CPU
50 * 3 = (2/5) * CPU
51 * 4 = (1/3) * CPU
52 * 6 = (1/4) * CPU
53 * 8 = (1/5) * CPU
54 * 10 = (1/6) * CPU
55 * 12 = (1/7) * CPU
56 * 14 = (1/8) * CPU
57 * 15 = (1/10) * CPU
58 * others reserved.
59 *
60 * SAR0[24:23] : TCLK frequency
61 * 0 = 166 MHz
62 * 1 = 125 MHz
63 * others reserved.
64 */
65
66#define SAR_DOVE_CPU_FREQ 5
67#define SAR_DOVE_CPU_FREQ_MASK 0xf
68#define SAR_DOVE_L2_RATIO 9
69#define SAR_DOVE_L2_RATIO_MASK 0x7
70#define SAR_DOVE_DDR_RATIO 12
71#define SAR_DOVE_DDR_RATIO_MASK 0xf
72#define SAR_DOVE_TCLK_FREQ 23
73#define SAR_DOVE_TCLK_FREQ_MASK 0x3
74
75enum { DOVE_CPU_TO_L2, DOVE_CPU_TO_DDR };
76
Sachin Kamat114c4742013-08-12 14:44:04 +053077static const struct coreclk_ratio dove_coreclk_ratios[] __initconst = {
Sebastian Hesselbarth5d840162013-05-11 03:08:03 +020078 { .id = DOVE_CPU_TO_L2, .name = "l2clk", },
79 { .id = DOVE_CPU_TO_DDR, .name = "ddrclk", }
80};
81
Sachin Kamat114c4742013-08-12 14:44:04 +053082static const u32 dove_tclk_freqs[] __initconst = {
Sebastian Hesselbarth5d840162013-05-11 03:08:03 +020083 166666667,
84 125000000,
85 0, 0
86};
87
88static u32 __init dove_get_tclk_freq(void __iomem *sar)
89{
90 u32 opt = (readl(sar) >> SAR_DOVE_TCLK_FREQ) &
91 SAR_DOVE_TCLK_FREQ_MASK;
92 return dove_tclk_freqs[opt];
93}
94
Sachin Kamat114c4742013-08-12 14:44:04 +053095static const u32 dove_cpu_freqs[] __initconst = {
Sebastian Hesselbarth5d840162013-05-11 03:08:03 +020096 0, 0, 0, 0, 0,
97 1000000000,
98 933333333, 933333333,
99 800000000, 800000000, 800000000,
100 1066666667,
101 666666667,
102 533333333,
103 400000000,
104 333333333
105};
106
107static u32 __init dove_get_cpu_freq(void __iomem *sar)
108{
109 u32 opt = (readl(sar) >> SAR_DOVE_CPU_FREQ) &
110 SAR_DOVE_CPU_FREQ_MASK;
111 return dove_cpu_freqs[opt];
112}
113
Sachin Kamat114c4742013-08-12 14:44:04 +0530114static const int dove_cpu_l2_ratios[8][2] __initconst = {
Sebastian Hesselbarth5d840162013-05-11 03:08:03 +0200115 { 1, 1 }, { 0, 1 }, { 1, 2 }, { 0, 1 },
116 { 1, 3 }, { 0, 1 }, { 1, 4 }, { 0, 1 }
117};
118
Sachin Kamat114c4742013-08-12 14:44:04 +0530119static const int dove_cpu_ddr_ratios[16][2] __initconst = {
Sebastian Hesselbarth5d840162013-05-11 03:08:03 +0200120 { 1, 1 }, { 0, 1 }, { 1, 2 }, { 2, 5 },
121 { 1, 3 }, { 0, 1 }, { 1, 4 }, { 0, 1 },
122 { 1, 5 }, { 0, 1 }, { 1, 6 }, { 0, 1 },
123 { 1, 7 }, { 0, 1 }, { 1, 8 }, { 1, 10 }
124};
125
126static void __init dove_get_clk_ratio(
127 void __iomem *sar, int id, int *mult, int *div)
128{
129 switch (id) {
130 case DOVE_CPU_TO_L2:
131 {
132 u32 opt = (readl(sar) >> SAR_DOVE_L2_RATIO) &
133 SAR_DOVE_L2_RATIO_MASK;
134 *mult = dove_cpu_l2_ratios[opt][0];
135 *div = dove_cpu_l2_ratios[opt][1];
136 break;
137 }
138 case DOVE_CPU_TO_DDR:
139 {
140 u32 opt = (readl(sar) >> SAR_DOVE_DDR_RATIO) &
141 SAR_DOVE_DDR_RATIO_MASK;
142 *mult = dove_cpu_ddr_ratios[opt][0];
143 *div = dove_cpu_ddr_ratios[opt][1];
144 break;
145 }
146 }
147}
148
149static const struct coreclk_soc_desc dove_coreclks = {
150 .get_tclk_freq = dove_get_tclk_freq,
151 .get_cpu_freq = dove_get_cpu_freq,
152 .get_clk_ratio = dove_get_clk_ratio,
153 .ratios = dove_coreclk_ratios,
154 .num_ratios = ARRAY_SIZE(dove_coreclk_ratios),
155};
156
Sebastian Hesselbarth5d840162013-05-11 03:08:03 +0200157/*
158 * Clock Gating Control
159 */
160
Sachin Kamat114c4742013-08-12 14:44:04 +0530161static const struct clk_gating_soc_desc dove_gating_desc[] __initconst = {
Sebastian Hesselbarth5d840162013-05-11 03:08:03 +0200162 { "usb0", NULL, 0, 0 },
163 { "usb1", NULL, 1, 0 },
164 { "ge", "gephy", 2, 0 },
165 { "sata", NULL, 3, 0 },
166 { "pex0", NULL, 4, 0 },
167 { "pex1", NULL, 5, 0 },
168 { "sdio0", NULL, 8, 0 },
169 { "sdio1", NULL, 9, 0 },
170 { "nand", NULL, 10, 0 },
171 { "camera", NULL, 11, 0 },
172 { "i2s0", NULL, 12, 0 },
173 { "i2s1", NULL, 13, 0 },
174 { "crypto", NULL, 15, 0 },
175 { "ac97", NULL, 21, 0 },
176 { "pdma", NULL, 22, 0 },
177 { "xor0", NULL, 23, 0 },
178 { "xor1", NULL, 24, 0 },
179 { "gephy", NULL, 30, 0 },
180 { }
181};
182
Sebastian Hesselbarth8f7fc542014-01-25 19:19:09 +0100183static void __init dove_clk_init(struct device_node *np)
Sebastian Hesselbarth5d840162013-05-11 03:08:03 +0200184{
Sebastian Hesselbarth8f7fc542014-01-25 19:19:09 +0100185 struct device_node *cgnp =
186 of_find_compatible_node(NULL, NULL, "marvell,dove-gating-clock");
187
188 mvebu_coreclk_setup(np, &dove_coreclks);
189
190 if (cgnp)
191 mvebu_clk_gating_setup(cgnp, dove_gating_desc);
Sebastian Hesselbarth5d840162013-05-11 03:08:03 +0200192}
Sebastian Hesselbarth8f7fc542014-01-25 19:19:09 +0100193CLK_OF_DECLARE(dove_clk, "marvell,dove-core-clock", dove_clk_init);