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gerrit.devboardsforandroid.linaro.org / platform / external / u-boot / f404b66ce118343b77ae58f78cccd6381b329dd1 / . / arch / arm / mach-uniphier / clk / pll-base-ld20.c
blob: caa631d9f766ebb243d249078c3ec642b916dbde [file] [log] [blame]
Masahiro Yamada682e09f2016-09-17 03:33:11 +0900[diff] [blame]1/*
2 * Copyright (C) 2016 Socionext Inc.
3 * Author: Masahiro Yamada <yamada.masahiro@socionext.com>
4 *
5 * SPDX-License-Identifier: GPL-2.0+
6 */
7
8#include <common.h>
9#include <linux/bitops.h>
10#include <linux/io.h>
11#include <linux/sizes.h>
12
13#include "pll.h"
14
15/* PLL type: SSC */
16#define SC_PLLCTRL_SSC_DK_MASK GENMASK(14, 0)
17#define SC_PLLCTRL_SSC_EN BIT(31)
18#define SC_PLLCTRL2_NRSTDS BIT(28)
19#define SC_PLLCTRL2_SSC_JK_MASK GENMASK(26, 0)
20
21/* PLL type: VPLL27 */
22#define SC_VPLL27CTRL_WP BIT(0)
23#define SC_VPLL27CTRL3_K_LD BIT(28)
24
25/* PLL type: DSPLL */
26#define SC_DSPLLCTRL2_K_LD BIT(28)
27
28int uniphier_ld20_sscpll_init(unsigned long reg_base, unsigned int freq,
29 unsigned int ssc_rate, unsigned int divn)
30{
31 void __iomem *base;
32 u32 tmp;
33
34 base = ioremap(reg_base, SZ_16);
35 if (!base)
36 return -ENOMEM;
37
38 if (freq != UNIPHIER_PLL_FREQ_DEFAULT) {
39 tmp = readl(base); /* SSCPLLCTRL */
40 tmp &= ~SC_PLLCTRL_SSC_DK_MASK;
41 tmp |= (487 * freq * ssc_rate / divn / 512) &
42 SC_PLLCTRL_SSC_DK_MASK;
43 writel(tmp, base);
44
45 tmp = readl(base + 4);
46 tmp &= ~SC_PLLCTRL2_SSC_JK_MASK;
47 tmp |= (41859 * freq / divn) & SC_PLLCTRL2_SSC_JK_MASK;
48
49 udelay(50);
50 }
51
52 tmp = readl(base + 4); /* SSCPLLCTRL2 */
53 tmp |= SC_PLLCTRL2_NRSTDS;
54 writel(tmp, base + 4);
55
56 iounmap(base);
57
58 return 0;
59}
60
61int uniphier_ld20_sscpll_ssc_en(unsigned long reg_base)
62{
63 void __iomem *base;
64 u32 tmp;
65
66 base = ioremap(reg_base, SZ_16);
67 if (!base)
68 return -ENOMEM;
69
Masahiro Yamada682e09f2016-09-17 03:33:11 +0900[diff] [blame]70 tmp = readl(base); /* SSCPLLCTRL */
71 tmp |= SC_PLLCTRL_SSC_EN;
72 writel(tmp, base);
73
74 iounmap(base);
75
76 return 0;
77}
78
79int uniphier_ld20_vpll27_init(unsigned long reg_base)
80{
81 void __iomem *base;
82 u32 tmp;
83
84 base = ioremap(reg_base, SZ_16);
85 if (!base)
86 return -ENOMEM;
87
88 tmp = readl(base); /* VPLL27CTRL */
89 tmp |= SC_VPLL27CTRL_WP; /* write protect off */
90 writel(tmp, base);
91
92 tmp = readl(base + 8); /* VPLL27CTRL3 */
93 tmp |= SC_VPLL27CTRL3_K_LD;
94 writel(tmp, base + 8);
95
96 tmp = readl(base); /* VPLL27CTRL */
97 tmp &= ~SC_VPLL27CTRL_WP; /* write protect on */
98 writel(tmp, base);
99
100 iounmap(base);
101
102 return 0;
103}
104
105int uniphier_ld20_dspll_init(unsigned long reg_base)
106{
107 void __iomem *base;
108 u32 tmp;
109
110 base = ioremap(reg_base, SZ_16);
111 if (!base)
112 return -ENOMEM;
113
114 tmp = readl(base + 8); /* DSPLLCTRL2 */
115 tmp |= SC_DSPLLCTRL2_K_LD;
116 writel(tmp, base + 8);
117
118 iounmap(base);
119
120 return 0;
121}