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
207
208
209
|
/****************************************************************************
* arch/mips/src/pic32/pic32mz-lowinit.c
*
* Copyright (C) 2015 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 <assert.h>
#include <arch/pic32mz/cp0.h>
#include <arch/board/board.h>
#include "up_internal.h"
#include "up_arch.h"
#include "chip/pic32mz-prefetch.h"
#include "pic32mz-lowconsole.h"
#include "pic32mz-lowinit.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Maximum Frequencies ******************************************************/
#define MAX_FLASH_ECC_HZ 66000000 /* Maximum FLASH speed (Hz) with ECC */
#define MAX_FLASH_NOECC_HZ 83000000 /* Maximum FLASH speed (Hz) without ECC */
#define MAX_PBCLOCK 80000000 /* Max peripheral bus speed (Hz) */
/* Sanity checks ************************************************************/
/* Make sure that the selected clock parameters are sane */
#define CALC_SYSCLOCK (((BOARD_PLL_INPUT / BOARD_PLL_IDIV) * BOARD_PLL_MULT) / BOARD_PLL_ODIV)
#if CALC_SYSCLOCK != BOARD_CPU_CLOCK
# error "Bad BOARD_CPU_CLOCK calculcation in board.h"
#endif
#define CALC_PBCLOCK (CALC_SYSCLOCK / BOARD_PBDIV)
#if CALC_PBCLOCK != BOARD_PBCLOCK
# error "Bad BOARD_PBCLOCK calculcation in board.h"
#endif
#if CALC_PBCLOCK > MAX_PBCLOCK
# error "PBCLOCK exceeds maximum value"
#endif
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/****************************************************************************
* Global Variables
****************************************************************************/
/****************************************************************************
* Private Variables
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: pic32mz_prefetch
*
* Description:
* Configure the prefetch module setting:
*
* 1. The optimal number of FLASH wait states.
* 2. Enable prefetch on CPU instructions and data
*
* Assumptions:
* Interrupts are disabled.
*
****************************************************************************/
static inline void pic32mz_prefetch(void)
{
unsigned int nwaits;
unsigned int residual;
uint32_t regval;
/* Configure pre-fetch cache FLASH wait states (assuming ECC is enabled) */
residual = BOARD_CPU_CLOCK;
nwaits = 0;
while (residual > MAX_FLASH_ECC_HZ)
{
nwaits++;
residual -= MAX_FLASH_ECC_HZ;
}
DEBUGASSERT(nwaits < 8);
/* Set the FLASH wait states and enabled prefetch on CPU instructions and
* data.
*/
regval = (PREFETCH_PRECON_PREFEN_CPUID | PREFETCH_PRECON_PFMWS(nwaits));
putreg32(regval, PIC32MZ_PREFETCH_PRECON);
}
/****************************************************************************
* Name: pic32mz_k0cache
*
* Description:
* Enable caching in KSEG0.
*
* Assumptions:
* Interrupts are disabled.
*
****************************************************************************/
static inline void pic32mz_k0cache(void)
{
register uint32_t regval;
/* Enable cache on KSEG 0 in the CP0 CONFIG register*/
asm("\tmfc0 %0,$16,0\n" : "=r"(regval));
regval &= ~CP0_CONFIG_K23_MASK;
regval |= CP0_CONFIG_K23_CACHEABLE;
asm("\tmtc0 %0,$16,0\n" : : "r" (regval));
UNUSED(regval);
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: pic32mz_lowinit
*
* Description:
* This performs basic low-level initialization of the system.
*
* Assumptions:
* Interrupts have not yet been enabled.
*
****************************************************************************/
void pic32mz_lowinit(void)
{
/* Initialize FLASH wait states */
pic32mz_prefetch();
/* Enable caching in KSEG0 */
pic32mz_k0cache();;
/* Initialize a console (probably a serial console) */
pic32mz_consoleinit();
/* Perform early serial initialization (so that we will have debug output
* available as soon as possible).
*/
#ifdef USE_EARLYSERIALINIT
up_earlyserialinit();
#endif
/* Perform board-level initialization */
pic32mz_boardinitialize();
}
|
