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git01.mediatek.com / filogic / uboot / da1ad1169721546b1b2a2767267fa62472f025a7 / . / arch / mips / mach-ath79 / qca953x / clk.c
blob: 533356c6a1c7a94a1c6ba759516719d378dcfb67 [file] [log] [blame]
Wills Wang6b83b442016-03-16 16:59:54 +0800[diff] [blame]1/*
2 * Copyright (C) 2015-2016 Wills Wang <wills.wang@live.com>
3 *
4 * SPDX-License-Identifier: GPL-2.0+
5 */
6
7#include <common.h>
8#include <asm/io.h>
9#include <asm/addrspace.h>
10#include <asm/types.h>
11#include <mach/ar71xx_regs.h>
Wills Wangddc05522016-05-30 22:54:50 +0800[diff] [blame]12#include <mach/ath79.h>
Wills Wang6b83b442016-03-16 16:59:54 +0800[diff] [blame]13
14DECLARE_GLOBAL_DATA_PTR;
15
16static u32 qca953x_get_xtal(void)
17{
18 u32 val;
19
Wills Wangddc05522016-05-30 22:54:50 +0800[diff] [blame]20 val = ath79_get_bootstrap();
Wills Wang6b83b442016-03-16 16:59:54 +0800[diff] [blame]21 if (val & QCA953X_BOOTSTRAP_REF_CLK_40)
22 return 40000000;
23 else
24 return 25000000;
25}
26
27int get_serial_clock(void)
28{
29 return qca953x_get_xtal();
30}
31
32int get_clocks(void)
33{
34 void __iomem *regs;
35 u32 val, ctrl, xtal, pll, div;
36
37 regs = map_physmem(AR71XX_PLL_BASE, AR71XX_PLL_SIZE,
38 MAP_NOCACHE);
39
40 xtal = qca953x_get_xtal();
41 ctrl = readl(regs + QCA953X_PLL_CLK_CTRL_REG);
42 val = readl(regs + QCA953X_PLL_CPU_CONFIG_REG);
43
44 /* VCOOUT = XTAL * DIV_INT */
45 div = (val >> QCA953X_PLL_CPU_CONFIG_REFDIV_SHIFT)
46 & QCA953X_PLL_CPU_CONFIG_REFDIV_MASK;
47 pll = xtal / div;
48
49 /* PLLOUT = VCOOUT * (1/2^OUTDIV) */
50 div = (val >> QCA953X_PLL_CPU_CONFIG_NINT_SHIFT)
51 & QCA953X_PLL_CPU_CONFIG_NINT_MASK;
52 pll *= div;
53 div = (val >> QCA953X_PLL_CPU_CONFIG_OUTDIV_SHIFT)
54 & QCA953X_PLL_CPU_CONFIG_OUTDIV_MASK;
55 if (!div)
56 div = 1;
57 pll >>= div;
58
59 /* CPU_CLK = PLLOUT / CPU_POST_DIV */
60 div = ((ctrl >> QCA953X_PLL_CLK_CTRL_CPU_POST_DIV_SHIFT)
61 & QCA953X_PLL_CLK_CTRL_CPU_POST_DIV_MASK) + 1;
62 gd->cpu_clk = pll / div;
63
64
65 val = readl(regs + QCA953X_PLL_DDR_CONFIG_REG);
66 /* VCOOUT = XTAL * DIV_INT */
67 div = (val >> QCA953X_PLL_DDR_CONFIG_REFDIV_SHIFT)
68 & QCA953X_PLL_DDR_CONFIG_REFDIV_MASK;
69 pll = xtal / div;
70
71 /* PLLOUT = VCOOUT * (1/2^OUTDIV) */
72 div = (val >> QCA953X_PLL_DDR_CONFIG_NINT_SHIFT)
73 & QCA953X_PLL_DDR_CONFIG_NINT_MASK;
74 pll *= div;
75 div = (val >> QCA953X_PLL_DDR_CONFIG_OUTDIV_SHIFT)
76 & QCA953X_PLL_DDR_CONFIG_OUTDIV_MASK;
77 if (!div)
78 div = 1;
79 pll >>= div;
80
81 /* DDR_CLK = PLLOUT / DDR_POST_DIV */
82 div = ((ctrl >> QCA953X_PLL_CLK_CTRL_DDR_POST_DIV_SHIFT)
83 & QCA953X_PLL_CLK_CTRL_DDR_POST_DIV_MASK) + 1;
84 gd->mem_clk = pll / div;
85
86 div = ((ctrl >> QCA953X_PLL_CLK_CTRL_AHB_POST_DIV_SHIFT)
87 & QCA953X_PLL_CLK_CTRL_AHB_POST_DIV_MASK) + 1;
88 if (ctrl & QCA953X_PLL_CLK_CTRL_AHBCLK_FROM_DDRPLL) {
89 /* AHB_CLK = DDR_CLK / AHB_POST_DIV */
90 gd->bus_clk = gd->mem_clk / (div + 1);
91 } else {
92 /* AHB_CLK = CPU_CLK / AHB_POST_DIV */
93 gd->bus_clk = gd->cpu_clk / (div + 1);
94 }
95
96 return 0;
97}
98
99ulong get_bus_freq(ulong dummy)
100{
101 if (!gd->bus_clk)
102 get_clocks();
103 return gd->bus_clk;
104}
105
106ulong get_ddr_freq(ulong dummy)
107{
108 if (!gd->mem_clk)
109 get_clocks();
110 return gd->mem_clk;
111}