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
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
|
/**************************************************************************
* arch/avr/src/at91uc3/at91uc3_clkinit.c
*
* Copyright (C) 2010 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* 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 <arch/board/board.h>
#include "up_arch.h"
#include "at91uc3_config.h"
#include "up_internal.h"
#include "at91uc3_internal.h"
#include "at91uc3_pm.h"
/**************************************************************************
* Private Definitions
**************************************************************************/
/**************************************************************************
* Private Types
**************************************************************************/
/**************************************************************************
* Private Function Prototypes
**************************************************************************/
/**************************************************************************
* Global Variables
**************************************************************************/
/**************************************************************************
* Private Variables
**************************************************************************/
/**************************************************************************
* Private Functions
**************************************************************************/
/**************************************************************************
* Name: up_enableosc32
*
* Description:
* Initialiaze the 32KHz oscillaor. This oscillaor is used by the RTC
* logic to provide the sysem timer.
*
**************************************************************************/
static inline void up_enableosc32(void)
{
uint32_t regval;
/* Select the 32KHz oscillator crystal */
regval = getreg32(AVR32_PM_OSCCTRL32);
regval &= ~PM_OSCCTRL32_MODE_MASK;
regval |= PM_OSCCTRL32_MODE_XTAL;
putreg32(regval, AVR32_PM_OSCCTRL32);
/* Enable the 32-kHz clock */
regval = getreg32(AVR32_PM_OSCCTRL32);
regval &= ~PM_OSCCTRL_STARTUP_MASK;
regval |= PM_OSCCTRL32_EN|(AVR32_OSC32STARTUP << PM_OSCCTRL_STARTUP_SHIFT);
putreg32(regval, AVR32_PM_OSCCTRL32);
}
/**************************************************************************
* Name: up_enableosc0
*
* Description:
* Initialiaze clock/PLL settings per the definitions in the board.h
* file.
*
**************************************************************************/
static inline void up_enableosc0(void)
{
uint32_t regval;
/* Enable OSC0 in the correct crystal mode by setting the mode value in OSCCTRL0 */
regval = getreg32(AVR32_PM_OSCCTRL0);
regval &= ~PM_OSCCTRL_MODE_MASK;
#if AVR32_FOSC0 < 900000
regval |= PM_OSCCTRL_MODE_XTALp9; /* Crystal XIN 0.4-0.9MHz */
#elif AVR32_FOSC0 < 3000000
regval |= PM_OSCCTRL_MODE_XTAL3; /* Crystal XIN 0.9-3.0MHz */
#elif AVR32_FOSC0 < 8000000
regval |= PM_OSCCTRL_MODE_XTAL8; /* Crystal XIN 3.0-8.0MHz */
#else
regval |= PM_OSCCTRL_MODE_XTALHI; /* Crystal XIN above 8.0MHz */
#endif
putreg32(regval, AVR32_PM_OSCCTRL0);
/* Enable CLK 0 using the startup time provided in board.h. This startup time
* is critical and depends on the characteristics of the crystal.
*/
regval = getreg32(AVR32_PM_OSCCTRL0);
regval &= ~PM_OSCCTRL_STARTUP_MASK;
regval |= (AVR32_OSC0STARTUP << PM_OSCCTRL_STARTUP_SHIFT);
putreg32(regval, AVR32_PM_OSCCTRL0);
/* Enable OSC0 */
regval = getreg32(AVR32_PM_MCCTRL);
regval |= PM_MCCTRL_OSC0EN;
putreg32(regval, AVR32_PM_MCCTRL);
/* Wait for CLK0 to be ready */
while ((getreg32(AVR32_PM_POSCSR) & PM_POSCSR_OSC0RDY) == 0);
}
/**************************************************************************
* Name: up_mainclk
*
* Description:
* Initialiaze clock/PLL settings per the definitions in the board.h
* file.
*
**************************************************************************/
static inline void up_mainclk(uint32_t mcsel)
{
uint32_t regval;
regval = getreg32(AVR32_PM_MCCTRL);
regval &= ~PM_MCCTRL_MCSEL_MASK;
regval |= mcsel;
putreg32(regval, AVR32_PM_MCCTRL);
}
/**************************************************************************
* Public Functions
**************************************************************************/
/**************************************************************************
* Name: up_clkinit
*
* Description:
* Initialiaze clock/PLL settings per the definitions in the board.h
* file.
*
**************************************************************************/
void up_clkinitialize(void)
{
/* Enable the 32KHz oscillator (need by the RTC module) */
up_enableosc32();
#if defined(AVR32_CLOCK_OSC0)
/* Enable OSC0 using the settings in board.h */
up_enableosc0();
/* Then switch the main clock to OSC0 */
up_mainclk(PM_MCCTRL_MCSEL_OSC0);
#elif defined(AVR32_CLOCK_PLL0)
# warning "Missing Logic"
#else
# error "No main clock"
#endif
}
|
