2 * Marvell Dove SoC clocks
4 * Copyright (C) 2012 Marvell
6 * Gregory CLEMENT <gregory.clement@free-electrons.com>
7 * Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
8 * Andrew Lunn <andrew@lunn.ch>
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.
15 #include <linux/kernel.h>
16 #include <linux/clk-provider.h>
24 * Dove PLL sample-at-reset configuration
26 * SAR0[8:5] : CPU frequency
40 * SAR0[11:9] : CPU to L2 Clock divider ratio
47 * SAR0[15:12] : CPU to DDR DRAM Clock divider ratio
60 * SAR0[24:23] : TCLK frequency
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
75 enum { DOVE_CPU_TO_L2, DOVE_CPU_TO_DDR };
77 static const struct coreclk_ratio dove_coreclk_ratios[] __initconst = {
78 { .id = DOVE_CPU_TO_L2, .name = "l2clk", },
79 { .id = DOVE_CPU_TO_DDR, .name = "ddrclk", }
82 static const u32 dove_tclk_freqs[] __initconst = {
88 static u32 __init dove_get_tclk_freq(void __iomem *sar)
90 u32 opt = (readl(sar) >> SAR_DOVE_TCLK_FREQ) &
91 SAR_DOVE_TCLK_FREQ_MASK;
92 return dove_tclk_freqs[opt];
95 static const u32 dove_cpu_freqs[] __initconst = {
99 800000000, 800000000, 800000000,
107 static u32 __init dove_get_cpu_freq(void __iomem *sar)
109 u32 opt = (readl(sar) >> SAR_DOVE_CPU_FREQ) &
110 SAR_DOVE_CPU_FREQ_MASK;
111 return dove_cpu_freqs[opt];
114 static const int dove_cpu_l2_ratios[8][2] __initconst = {
115 { 1, 1 }, { 0, 1 }, { 1, 2 }, { 0, 1 },
116 { 1, 3 }, { 0, 1 }, { 1, 4 }, { 0, 1 }
119 static const int dove_cpu_ddr_ratios[16][2] __initconst = {
120 { 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 }
126 static void __init dove_get_clk_ratio(
127 void __iomem *sar, int id, int *mult, int *div)
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];
138 case DOVE_CPU_TO_DDR:
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];
149 static 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),
158 * Clock Gating Control
161 static const struct clk_gating_soc_desc dove_gating_desc[] __initconst = {
162 { "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 },
183 static void __init dove_clk_init(struct device_node *np)
185 struct device_node *cgnp =
186 of_find_compatible_node(NULL, NULL, "marvell,dove-gating-clock");
188 mvebu_coreclk_setup(np, &dove_coreclks);
191 mvebu_clk_gating_setup(cgnp, dove_gating_desc);
193 CLK_OF_DECLARE(dove_clk, "marvell,dove-core-clock", dove_clk_init);