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
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
|
/*
* Copyright (c) 2006-2021, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2011-01-13 weety first version
*/
#include <rtthread.h>
#include <rthw.h>
#include "board.h"
#include <mmu.h>
/**
* @addtogroup at91sam9260
*/
/*@{*/
#if defined(__CC_ARM)
extern int Image$$ER_ZI$$ZI$$Limit;
#define HEAP_BEGIN (&Image$$ER_ZI$$ZI$$Limit)
#elif (defined (__GNUC__))
extern unsigned char __bss_end__;
#define HEAP_BEGIN (&__bss_end__)
#elif (defined (__ICCARM__))
#pragma section=".noinit"
#define HEAP_BEGIN (__section_end(".noinit"))
#endif
#define HEAP_END (((rt_uint32_t)HEAP_BEGIN & (0xF0 << 24)) + (32 << 20))
extern void rt_hw_interrupt_init(void);
extern void rt_hw_clock_init(void);
extern void rt_hw_get_clock(void);
extern void rt_hw_set_dividor(rt_uint8_t hdivn, rt_uint8_t pdivn);
extern void rt_hw_set_clock(rt_uint8_t sdiv, rt_uint8_t pdiv, rt_uint8_t mdiv);
extern void rt_dbgu_isr(void);
static struct mem_desc at91_mem_desc[] = {
{ 0x00000000, 0xFFFFFFFF, 0x00000000, RW_NCNB }, /* None cached for 4G memory */
{ 0x20000000, 0x24000000-1, 0x20000000, RW_CB }, /* 64M cached SDRAM memory */
{ 0x00000000, 0x100000, 0x20000000, RW_CB }, /* isr vector table */
{ 0x90000000, 0x90400000-1, 0x00200000, RW_NCNB }, /* 4K SRAM0@2M + 4k SRAM1@3M + 16k UHP@5M */
{ 0xA0000000, 0xA4000000-1, 0x20000000, RW_NCNB } /* 64M none-cached SDRAM memory */
};
#define PIT_CPIV(x) ((x) & AT91_PIT_CPIV)
#define PIT_PICNT(x) (((x) & AT91_PIT_PICNT) >> 20)
static rt_uint32_t pit_cycle; /* write-once */
static rt_uint32_t pit_cnt; /* access only w/system irq blocked */
/**
* This function will handle rtos timer
*/
void rt_timer_handler(int vector, void *param)
{
#ifdef RT_USING_DBGU
if (at91_sys_read(AT91_DBGU + AT91_US_CSR) & 0x1)
{
rt_dbgu_isr();
}
#endif
if (at91_sys_read(AT91_PIT_SR) & AT91_PIT_PITS)
{
unsigned nr_ticks;
/* Get number of ticks performed before irq, and ack it */
nr_ticks = PIT_PICNT(at91_sys_read(AT91_PIT_PIVR));
rt_tick_increase();
}
}
static void at91sam926x_pit_reset(void)
{
/* Disable timer and irqs */
at91_sys_write(AT91_PIT_MR, 0);
/* Clear any pending interrupts, wait for PIT to stop counting */
while (PIT_CPIV(at91_sys_read(AT91_PIT_PIVR)) != 0)
;
/* Start PIT but don't enable IRQ */
//at91_sys_write(AT91_PIT_MR, (pit_cycle - 1) | AT91_PIT_PITEN);
pit_cnt += pit_cycle * PIT_PICNT(at91_sys_read(AT91_PIT_PIVR));
at91_sys_write(AT91_PIT_MR, (pit_cycle - 1) | AT91_PIT_PITEN
| AT91_PIT_PITIEN);
rt_kprintf("PIT_MR=0x%08x\n", at91_sys_read(AT91_PIT_MR));
}
/*
* Set up both clocksource and clockevent support.
*/
static void at91sam926x_pit_init(void)
{
rt_uint32_t pit_rate;
rt_uint32_t bits;
/*
* Use our actual MCK to figure out how many MCK/16 ticks per
* 1/HZ period (instead of a compile-time constant LATCH).
*/
pit_rate = clk_get_rate(clk_get("mck")) / 16;
rt_kprintf("pit_rate=%dHZ\n", pit_rate);
pit_cycle = (pit_rate + RT_TICK_PER_SECOND/2) / RT_TICK_PER_SECOND;
/* Initialize and enable the timer */
at91sam926x_pit_reset();
}
/**
* This function will init pit for system ticks
*/
void rt_hw_timer_init()
{
at91sam926x_pit_init();
/* install interrupt handler */
rt_hw_interrupt_install(AT91_ID_SYS, rt_timer_handler,
RT_NULL, "system");
rt_hw_interrupt_umask(AT91_ID_SYS);
}
void at91_tc1_init()
{
at91_sys_write(AT91_PMC_PCER, 1<<AT91SAM9260_ID_TC0);
writel(AT91_TC_TC0XC0S_NONE | AT91_TC_TC1XC1S_NONE | AT91_TC_TC2XC2S_NONE, AT91SAM9260_BASE_TCB0 + AT91_TC_BMR);
writel(AT91_TC_CLKDIS, AT91SAM9260_BASE_TC0 + AT91_TC_CCR);
writel(AT91_TC_TIMER_CLOCK4, AT91SAM9260_BASE_TC0 + AT91_TC_CMR);
writel(0xffff, AT91SAM9260_BASE_TC0 + AT91_TC_CV);
}
#define RXRDY 0x01
#define TXRDY (1 << 1)
#define BPS 115200 /* serial baudrate */
typedef struct uartport
{
volatile rt_uint32_t CR;
volatile rt_uint32_t MR;
volatile rt_uint32_t IER;
volatile rt_uint32_t IDR;
volatile rt_uint32_t IMR;
volatile rt_uint32_t CSR;
volatile rt_uint32_t RHR;
volatile rt_uint32_t THR;
volatile rt_uint32_t BRGR;
volatile rt_uint32_t RTOR;
volatile rt_uint32_t TTGR;
volatile rt_uint32_t reserved0[5];
volatile rt_uint32_t FIDI;
volatile rt_uint32_t NER;
volatile rt_uint32_t reserved1;
volatile rt_uint32_t IFR;
volatile rt_uint32_t reserved2[44];
volatile rt_uint32_t RPR;
volatile rt_uint32_t RCR;
volatile rt_uint32_t TPR;
volatile rt_uint32_t TCR;
volatile rt_uint32_t RNPR;
volatile rt_uint32_t RNCR;
volatile rt_uint32_t TNPR;
volatile rt_uint32_t TNCR;
volatile rt_uint32_t PTCR;
volatile rt_uint32_t PTSR;
}uartport;
#define CIDR FIDI
#define EXID NER
#define FNR reserved1
#define DBGU ((struct uartport *)AT91SAM9260_BASE_DBGU)
static void at91_usart_putc(char c)
{
while (!(DBGU->CSR & TXRDY));
DBGU->THR = c;
}
/**
* This function is used to display a string on console, normally, it's
* invoked by rt_kprintf
*
* @param str the displayed string
*/
void rt_hw_console_output(const char* str)
{
while (*str)
{
if (*str=='\n')
{
at91_usart_putc('\r');
}
at91_usart_putc(*str++);
}
}
static void rt_hw_console_init(void)
{
int div;
int mode = 0;
DBGU->CR = AT91_US_RSTTX | AT91_US_RSTRX |
AT91_US_RXDIS | AT91_US_TXDIS;
mode |= AT91_US_USMODE_NORMAL | AT91_US_USCLKS_MCK |
AT91_US_CHMODE_NORMAL;
mode |= AT91_US_CHRL_8;
mode |= AT91_US_NBSTOP_1;
mode |= AT91_US_PAR_NONE;
DBGU->MR = mode;
div = (clk_get_rate(clk_get("mck")) / 16 + BPS/2) / BPS;
DBGU->BRGR = div;
DBGU->CR = AT91_US_RXEN | AT91_US_TXEN;
}
/**
* This function will init at91sam9260 board
*/
void rt_hw_board_init()
{
/* initialize the system clock */
rt_hw_clock_init();
/* initialize console */
rt_hw_console_init();
/* initialize mmu */
rt_hw_mmu_init(at91_mem_desc, sizeof(at91_mem_desc)/sizeof(at91_mem_desc[0]));
/* initialize hardware interrupt */
rt_hw_interrupt_init();
/* initialize early device */
#ifdef RT_USING_COMPONENTS_INIT
rt_components_board_init();
#endif
#if defined(RT_USING_CONSOLE) && defined(RT_USING_DEVICE)
rt_console_set_device(RT_CONSOLE_DEVICE_NAME);
#endif
/* initialize timer0 */
rt_hw_timer_init();
/* initialize board */
#ifdef RT_USING_HEAP
rt_system_heap_init((void *)HEAP_BEGIN, (void *)HEAP_END);
#endif
}
/*@}*/
|
