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
|
/* -*- c++ -*- */
/*
* Copyright 2009 Free Software Foundation, Inc.
* Copyright 2009-2011 Ettus Research LLC
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "spi_flash_private.h"
//#include <stdlib.h>
#include <nonstdio.h>
uint32_t
spi_flash_rdsr(void)
{
return spif_transact(SPI_TXRX, SPI_SS_FLASH, RDSR_CMD << 8, 16, FLAGS) & 0xff;
}
static void
spi_flash_write_enable(void)
{
// spif_transact(SPI_TXONLY, SPI_SS_FLASH, (WRSR_CMD << 8) | 0x00, 16, FLAGS); //disable write protection bits
spif_transact(SPI_TXONLY, SPI_SS_FLASH, WREN_CMD, 8, FLAGS);
}
bool
spi_flash_done_p(void)
{
return (spi_flash_rdsr() & SR_WIP) == 0;
}
void
spi_flash_wait(void)
{
while (!spi_flash_done_p())
;
}
void
spi_flash_erase_sector_start(uint32_t flash_addr)
{
//uprintf(UART_DEBUG, "spi_flash_erase_sector_start: addr = 0x%x\n", flash_addr);
if(flash_addr > spi_flash_memory_size())
return;
spi_flash_wait();
spi_flash_write_enable();
spif_transact(SPI_TXONLY, SPI_SS_FLASH,
(SE_CMD << 24) | (flash_addr & 0x00ffffff),
32, FLAGS);
}
bool
spi_flash_page_program_start(uint32_t flash_addr, size_t nbytes, const void *buf)
{
if (nbytes == 0 || nbytes > SPI_FLASH_PAGE_SIZE)
return false;
//please to not be writing past the end of the device
if ((flash_addr + nbytes) > spi_flash_memory_size())
return false;
uint32_t local_buf[SPI_FLASH_PAGE_SIZE / sizeof(uint32_t)];
memset(local_buf, 0xff, sizeof(local_buf)); // init to 0xff (nops when programming)
memcpy(local_buf, buf, nbytes);
spi_flash_wait();
spi_flash_write_enable();
/*
* We explicitly control the slave select here (/S), so that we can
* do the entire write operation as a single transaction from
* device's point of view. (The most our SPI peripheral can transfer
* in a single shot is 16 bytes.)
*/
spif_wait();
spif_regs->ss = 0;
spif_regs->ctrl = FLAGS; // ASS is now clear and no chip select is enabled.
/* write PP_CMD, ADDR2, ADDR1, ADDR0 */
spif_regs->txrx0 = (PP_CMD << 24) | (flash_addr & 0x00ffffff);
spif_regs->ss = SPI_SS_FLASH; // assert chip select
spif_regs->ctrl = FLAGS | LEN(4 * 8);
spif_regs->ctrl = FLAGS | LEN(4 * 8) | SPI_CTRL_GO_BSY;
spif_wait();
/* send 256 bytes total, 16 at a time */
for (size_t i = 0; i < 16; i++){
spif_regs->txrx3 = local_buf[i * 4 + 0];
spif_regs->txrx2 = local_buf[i * 4 + 1];
spif_regs->txrx1 = local_buf[i * 4 + 2];
spif_regs->txrx0 = local_buf[i * 4 + 3];
spif_regs->ctrl = FLAGS | LEN(16 * 8); // xfer 16 bytes
spif_regs->ctrl = FLAGS | LEN(16 * 8) | SPI_CTRL_GO_BSY;
spif_wait();
}
spif_regs->ss = 0; // desassert chip select
return true;
}
void
spi_flash_erase(uint32_t flash_addr, size_t nbytes)
{
if (nbytes == 0)
return;
uint32_t first = round_down(flash_addr, spi_flash_sector_size());
uint32_t last = round_down(flash_addr + nbytes - 1, spi_flash_sector_size());
for (uint32_t s = first; s <= last; s += spi_flash_sector_size()){
spi_flash_erase_sector_start(s);
}
spi_flash_wait();
}
bool
spi_flash_program(uint32_t flash_addr, size_t nbytes, const void *buf)
{
//uprintf(UART_DEBUG, "\nspi_flash_program: addr = 0x%x, nbytes = %d\n", flash_addr, nbytes);
const unsigned char *p = (const unsigned char *) buf;
size_t n;
if ((nbytes + flash_addr) > spi_flash_memory_size())
return false;
if (nbytes == 0)
return true;
uint32_t r = flash_addr % SPI_FLASH_PAGE_SIZE;
if (r){ /* do initial non-aligned page */
n = min(SPI_FLASH_PAGE_SIZE - r, nbytes);
spi_flash_page_program_start(flash_addr, n, p);
flash_addr += n;
p += n;
nbytes -= n;
}
while (nbytes > 0){
n = min(SPI_FLASH_PAGE_SIZE, nbytes);
spi_flash_page_program_start(flash_addr, n, p);
flash_addr += n;
p += n;
nbytes -= n;
}
spi_flash_wait();
return true;
}
void
spi_flash_async_erase_start(spi_flash_async_state_t *s,
uint32_t flash_addr, size_t nbytes)
{
if ((nbytes == 0) || ((flash_addr + nbytes) > spi_flash_memory_size())){
s->first = s->last = s->current = 0;
return;
}
uint32_t first = round_down(flash_addr, spi_flash_sector_size());
uint32_t last = round_down(flash_addr + nbytes - 1, spi_flash_sector_size());
s->first = first;
s->last = last;
s->current = first;
spi_flash_erase_sector_start(s->current);
}
bool
spi_flash_async_erase_poll(spi_flash_async_state_t *s)
{
if (!spi_flash_done_p())
return false;
//printf("%d/%d\n", s->current, s->last);
// The current sector erase has completed. See if we're finished or
// if there's more to do.
if (s->current == s->last) // we're done!
return true;
s->current += spi_flash_sector_size();
spi_flash_erase_sector_start(s->current);
return false;
}
|
