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
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
|
/*
*
* (C) Copyright 2000-2003
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* Copyright (C) 2004-2009 Freescale Semiconductor, Inc.
* TsiChung Liew (Tsi-Chung.Liew@freescale.com)
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <spi.h>
#include <malloc.h>
#include <asm/immap.h>
struct cf_spi_slave {
struct spi_slave slave;
uint baudrate;
int charbit;
};
int cfspi_xfer(struct spi_slave *slave, uint bitlen, const void *dout,
void *din, ulong flags);
struct spi_slave *cfspi_setup_slave(struct cf_spi_slave *cfslave, uint mode);
void cfspi_init(void);
void cfspi_tx(u32 ctrl, u16 data);
u16 cfspi_rx(void);
extern void cfspi_port_conf(void);
extern int cfspi_claim_bus(uint bus, uint cs);
extern void cfspi_release_bus(uint bus, uint cs);
DECLARE_GLOBAL_DATA_PTR;
#ifndef CONFIG_SPI_IDLE_VAL
#if defined(CONFIG_SPI_MMC)
#define CONFIG_SPI_IDLE_VAL 0xFFFF
#else
#define CONFIG_SPI_IDLE_VAL 0x0
#endif
#endif
#if defined(CONFIG_CF_DSPI)
/* DSPI specific mode */
#define SPI_MODE_MOD 0x00200000
#define SPI_DBLRATE 0x00100000
static inline struct cf_spi_slave *to_cf_spi_slave(struct spi_slave *slave)
{
return container_of(slave, struct cf_spi_slave, slave);
}
void cfspi_init(void)
{
volatile dspi_t *dspi = (dspi_t *) MMAP_DSPI;
cfspi_port_conf(); /* port configuration */
dspi->mcr = DSPI_MCR_MSTR | DSPI_MCR_CSIS7 | DSPI_MCR_CSIS6 |
DSPI_MCR_CSIS5 | DSPI_MCR_CSIS4 | DSPI_MCR_CSIS3 |
DSPI_MCR_CSIS2 | DSPI_MCR_CSIS1 | DSPI_MCR_CSIS0 |
DSPI_MCR_CRXF | DSPI_MCR_CTXF;
/* Default setting in platform configuration */
#ifdef CONFIG_SYS_DSPI_CTAR0
dspi->ctar[0] = CONFIG_SYS_DSPI_CTAR0;
#endif
#ifdef CONFIG_SYS_DSPI_CTAR1
dspi->ctar[1] = CONFIG_SYS_DSPI_CTAR1;
#endif
#ifdef CONFIG_SYS_DSPI_CTAR2
dspi->ctar[2] = CONFIG_SYS_DSPI_CTAR2;
#endif
#ifdef CONFIG_SYS_DSPI_CTAR3
dspi->ctar[3] = CONFIG_SYS_DSPI_CTAR3;
#endif
#ifdef CONFIG_SYS_DSPI_CTAR4
dspi->ctar[4] = CONFIG_SYS_DSPI_CTAR4;
#endif
#ifdef CONFIG_SYS_DSPI_CTAR5
dspi->ctar[5] = CONFIG_SYS_DSPI_CTAR5;
#endif
#ifdef CONFIG_SYS_DSPI_CTAR6
dspi->ctar[6] = CONFIG_SYS_DSPI_CTAR6;
#endif
#ifdef CONFIG_SYS_DSPI_CTAR7
dspi->ctar[7] = CONFIG_SYS_DSPI_CTAR7;
#endif
}
void cfspi_tx(u32 ctrl, u16 data)
{
volatile dspi_t *dspi = (dspi_t *) MMAP_DSPI;
while ((dspi->sr & 0x0000F000) >= 4) ;
dspi->tfr = (ctrl | data);
}
u16 cfspi_rx(void)
{
volatile dspi_t *dspi = (dspi_t *) MMAP_DSPI;
while ((dspi->sr & 0x000000F0) == 0) ;
return (dspi->rfr & 0xFFFF);
}
int cfspi_xfer(struct spi_slave *slave, uint bitlen, const void *dout,
void *din, ulong flags)
{
struct cf_spi_slave *cfslave = to_cf_spi_slave(slave);
u16 *spi_rd16 = NULL, *spi_wr16 = NULL;
u8 *spi_rd = NULL, *spi_wr = NULL;
static u32 ctrl = 0;
uint len = bitlen >> 3;
if (cfslave->charbit == 16) {
bitlen >>= 1;
spi_wr16 = (u16 *) dout;
spi_rd16 = (u16 *) din;
} else {
spi_wr = (u8 *) dout;
spi_rd = (u8 *) din;
}
if ((flags & SPI_XFER_BEGIN) == SPI_XFER_BEGIN)
ctrl |= DSPI_TFR_CONT;
ctrl = (ctrl & 0xFF000000) | ((1 << slave->cs) << 16);
if (len > 1) {
int tmp_len = len - 1;
while (tmp_len--) {
if (dout != NULL) {
if (cfslave->charbit == 16)
cfspi_tx(ctrl, *spi_wr16++);
else
cfspi_tx(ctrl, *spi_wr++);
cfspi_rx();
}
if (din != NULL) {
cfspi_tx(ctrl, CONFIG_SPI_IDLE_VAL);
if (cfslave->charbit == 16)
*spi_rd16++ = cfspi_rx();
else
*spi_rd++ = cfspi_rx();
}
}
len = 1; /* remaining byte */
}
if ((flags & SPI_XFER_END) == SPI_XFER_END)
ctrl &= ~DSPI_TFR_CONT;
if (len) {
if (dout != NULL) {
if (cfslave->charbit == 16)
cfspi_tx(ctrl, *spi_wr16);
else
cfspi_tx(ctrl, *spi_wr);
cfspi_rx();
}
if (din != NULL) {
cfspi_tx(ctrl, CONFIG_SPI_IDLE_VAL);
if (cfslave->charbit == 16)
*spi_rd16 = cfspi_rx();
else
*spi_rd = cfspi_rx();
}
} else {
/* dummy read */
cfspi_tx(ctrl, CONFIG_SPI_IDLE_VAL);
cfspi_rx();
}
return 0;
}
struct spi_slave *cfspi_setup_slave(struct cf_spi_slave *cfslave, uint mode)
{
/*
* bit definition for mode:
* bit 31 - 28: Transfer size 3 to 16 bits
* 27 - 26: PCS to SCK delay prescaler
* 25 - 24: After SCK delay prescaler
* 23 - 22: Delay after transfer prescaler
* 21 : Allow overwrite for bit 31-22 and bit 20-8
* 20 : Double baud rate
* 19 - 16: PCS to SCK delay scaler
* 15 - 12: After SCK delay scaler
* 11 - 8: Delay after transfer scaler
* 7 - 0: SPI_CPHA, SPI_CPOL, SPI_LSB_FIRST
*/
volatile dspi_t *dspi = (dspi_t *) MMAP_DSPI;
int prescaler[] = { 2, 3, 5, 7 };
int scaler[] = {
2, 4, 6, 8,
16, 32, 64, 128,
256, 512, 1024, 2048,
4096, 8192, 16384, 32768
};
int i, j, pbrcnt, brcnt, diff, tmp, dbr = 0;
int best_i, best_j, bestmatch = 0x7FFFFFFF, baud_speed;
u32 bus_setup = 0;
tmp = (prescaler[3] * scaler[15]);
/* Maximum and minimum baudrate it can handle */
if ((cfslave->baudrate > (gd->bus_clk >> 1)) ||
(cfslave->baudrate < (gd->bus_clk / tmp))) {
printf("Exceed baudrate limitation: Max %d - Min %d\n",
(int)(gd->bus_clk >> 1), (int)(gd->bus_clk / tmp));
return NULL;
}
/* Activate Double Baud when it exceed 1/4 the bus clk */
if ((CONFIG_SYS_DSPI_CTAR0 & DSPI_CTAR_DBR) ||
(cfslave->baudrate > (gd->bus_clk / (prescaler[0] * scaler[0])))) {
bus_setup |= DSPI_CTAR_DBR;
dbr = 1;
}
if (mode & SPI_CPOL)
bus_setup |= DSPI_CTAR_CPOL;
if (mode & SPI_CPHA)
bus_setup |= DSPI_CTAR_CPHA;
if (mode & SPI_LSB_FIRST)
bus_setup |= DSPI_CTAR_LSBFE;
/* Overwrite default value set in platform configuration file */
if (mode & SPI_MODE_MOD) {
if ((mode & 0xF0000000) == 0)
bus_setup |=
dspi->ctar[cfslave->slave.bus] & 0x78000000;
else
bus_setup |= ((mode & 0xF0000000) >> 1);
/*
* Check to see if it is enabled by default in platform
* config, or manual setting passed by mode parameter
*/
if (mode & SPI_DBLRATE) {
bus_setup |= DSPI_CTAR_DBR;
dbr = 1;
}
bus_setup |= (mode & 0x0FC00000) >> 4; /* PSCSCK, PASC, PDT */
bus_setup |= (mode & 0x000FFF00) >> 4; /* CSSCK, ASC, DT */
} else
bus_setup |= (dspi->ctar[cfslave->slave.bus] & 0x78FCFFF0);
cfslave->charbit =
((dspi->ctar[cfslave->slave.bus] & 0x78000000) ==
0x78000000) ? 16 : 8;
pbrcnt = sizeof(prescaler) / sizeof(int);
brcnt = sizeof(scaler) / sizeof(int);
/* baudrate calculation - to closer value, may not be exact match */
for (best_i = 0, best_j = 0, i = 0; i < pbrcnt; i++) {
baud_speed = gd->bus_clk / prescaler[i];
for (j = 0; j < brcnt; j++) {
tmp = (baud_speed / scaler[j]) * (1 + dbr);
if (tmp > cfslave->baudrate)
diff = tmp - cfslave->baudrate;
else
diff = cfslave->baudrate - tmp;
if (diff < bestmatch) {
bestmatch = diff;
best_i = i;
best_j = j;
}
}
}
bus_setup |= (DSPI_CTAR_PBR(best_i) | DSPI_CTAR_BR(best_j));
dspi->ctar[cfslave->slave.bus] = bus_setup;
return &cfslave->slave;
}
#endif /* CONFIG_CF_DSPI */
#ifdef CONFIG_CF_QSPI
/* 52xx, 53xx */
#endif /* CONFIG_CF_QSPI */
#ifdef CONFIG_CMD_SPI
int spi_cs_is_valid(unsigned int bus, unsigned int cs)
{
if (((cs >= 0) && (cs < 8)) && ((bus >= 0) && (bus < 8)))
return 1;
else
return 0;
}
void spi_init_f(void)
{
}
void spi_init_r(void)
{
}
void spi_init(void)
{
cfspi_init();
}
struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
unsigned int max_hz, unsigned int mode)
{
struct cf_spi_slave *cfslave;
if (!spi_cs_is_valid(bus, cs))
return NULL;
cfslave = spi_alloc_slave(struct cf_spi_slave, bus, cs);
if (!cfslave)
return NULL;
cfslave->baudrate = max_hz;
/* specific setup */
return cfspi_setup_slave(cfslave, mode);
}
void spi_free_slave(struct spi_slave *slave)
{
struct cf_spi_slave *cfslave = to_cf_spi_slave(slave);
free(cfslave);
}
int spi_claim_bus(struct spi_slave *slave)
{
return cfspi_claim_bus(slave->bus, slave->cs);
}
void spi_release_bus(struct spi_slave *slave)
{
cfspi_release_bus(slave->bus, slave->cs);
}
int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
void *din, unsigned long flags)
{
return cfspi_xfer(slave, bitlen, dout, din, flags);
}
#endif /* CONFIG_CMD_SPI */
|
