1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
|
/****************************************************************************
* arch/arm/src/nuc1xx/nuc_clockconfig.c
*
* Copyright (C) 2013 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <assert.h>
#include <debug.h>
#include <nuttx/arch.h>
#include <arch/board/board.h>
#include "up_arch.h"
#include "chip.h"
#include "chip/chip/nuc_gcr.h"
#include "chip/chip/nuc_clk.h"
#include "nuc_clockconfig.h"
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: nuc_unlock
*
* Description:
* Unlock registers
*
* Input Parameters:
* None
*
* Returned Value:
* None
*
****************************************************************************/
static inline void nuc_unlock(void)
{
putreg32(0x59, NUC_GCR_REGWRPROT);
putreg32(0x16, NUC_GCR_REGWRPROT);
putreg32(0x88, NUC_GCR_REGWRPROT);
}
/****************************************************************************
* Name: nuclock
*
* Description:
* Lok registers
*
* Input Parameters:
* None
*
* Returned Value:
* None
*
****************************************************************************/
static inline void nuc_lock(void)
{
putreg32(0, NUC_GCR_REGWRPROT);
}
/****************************************************************************
* Public Functions
****************************************************************************/
/************************************************************************************
* Name: nuc_clockconfig
*
* Description:
* Called to establish the clock settings based on the values in board.h.
*
* Input Parameters:
* None
*
* Returned Value:
* None
*
************************************************************************************/
void nuc_clockconfig(void)
{
uint32_t regval;
/* Unlock registers */
nuc_unlock();
/* Enable External 4~24 mhz high speed crystal */
regval = getreg32(NUC_CLK_PWRCON);
regval |= CLK_PWRCON_XTL12M_EN;
putreg32(regval, NUC_CLK_PWRCON);
/* Delay to assure that crystal input to be stable */
up_mdelay(5);
/* Set up the PLL configuration.
*
* Feedback divider (FB_DV) = Determined by settings in board.h
* Input divider (IN_DV) = Determined by settings in board.h
* Output divider (OUT_DV) = Determined by settings in board.h
* Power down mode (PD) = Normal mode (0)
* Bypass (BP) = Normal mode (0)
* FOUT enable (OE) = PLL FOUT enabled (0)
* PLL srouce clock (PLL_SRC) = External high speed crystal (0)
*/
regval = getreg32(NUC_CLK_PLLCON);
regval &= ~(CLK_PLLCON_FB_DV_MASK | CLK_PLLCON_IN_DV_MASK |
CLK_PLLCON_OUT_DV_MASK | CLK_PLLCON_PD | CLK_PLLCON_BP |
CLK_PLLCON_OE | CLK_PLLCON_PLL_SRC);
regval |= (CLK_PLLCON_FB_DV(BOARD_PLL_FB_DV) |
CLK_PLLCON_IN_DV(BOARD_PLL_IN_DV) |
CLK_PLLCON_OUT_DV(BOARD_PLL_OUT_DV));
putreg32(regval, NUC_CLK_PLLCON);
/* Delay until the PLL output is stable */
up_mdelay(5);
/* Set the HCLK divider per settings from the board.h file */
regval = getreg32(NUC_CLK_CLKDIV);
regval &= ~CLK_CLKDIV_HCLK_N_MASK;
regval |= CLK_CLKDIV_HCLK_N(BOARD_HCLK_N);
putreg32(regval, NUC_CLK_CLKDIV);
/* Select the PLL output as the HCLKC source */
regval = getreg32(NUC_CLK_CLKSEL0);
regval &= ~CLK_CLKSEL0_HCLK_S_MASK;
regval |= CLK_CLKSEL0_HCLK_S_PLL;
putreg32(regval, NUC_CLK_CLKSEL0);
up_mdelay(1);
/* Lock the registers */
nuc_lock();
}
|
