2 * eSPI controller driver.
4 * Copyright 2010-2011 Freescale Semiconductor, Inc.
5 * Author: Mingkai Hu (Mingkai.hu@freescale.com)
7 * SPDX-License-Identifier: GPL-2.0+
14 #include <asm/immap_85xx.h>
16 struct fsl_spi_slave
{
17 struct spi_slave slave
;
26 unsigned int max_transfer_length
;
29 #define to_fsl_spi_slave(s) container_of(s, struct fsl_spi_slave, slave)
30 #define US_PER_SECOND 1000000UL
32 #define ESPI_MAX_CS_NUM 4
33 #define ESPI_FIFO_WIDTH_BIT 32
35 #define ESPI_EV_RNE BIT(9)
36 #define ESPI_EV_TNF BIT(8)
37 #define ESPI_EV_DON BIT(14)
38 #define ESPI_EV_TXE BIT(15)
39 #define ESPI_EV_RFCNT_SHIFT 24
40 #define ESPI_EV_RFCNT_MASK (0x3f << ESPI_EV_RFCNT_SHIFT)
42 #define ESPI_MODE_EN BIT(31) /* Enable interface */
43 #define ESPI_MODE_TXTHR(x) ((x) << 8) /* Tx FIFO threshold */
44 #define ESPI_MODE_RXTHR(x) ((x) << 0) /* Rx FIFO threshold */
46 #define ESPI_COM_CS(x) ((x) << 30)
47 #define ESPI_COM_TRANLEN(x) ((x) << 0)
49 #define ESPI_CSMODE_CI_INACTIVEHIGH BIT(31)
50 #define ESPI_CSMODE_CP_BEGIN_EDGCLK BIT(30)
51 #define ESPI_CSMODE_REV_MSB_FIRST BIT(29)
52 #define ESPI_CSMODE_DIV16 BIT(28)
53 #define ESPI_CSMODE_PM(x) ((x) << 24)
54 #define ESPI_CSMODE_POL_ASSERTED_LOW BIT(20)
55 #define ESPI_CSMODE_LEN(x) ((x) << 16)
56 #define ESPI_CSMODE_CSBEF(x) ((x) << 12)
57 #define ESPI_CSMODE_CSAFT(x) ((x) << 8)
58 #define ESPI_CSMODE_CSCG(x) ((x) << 3)
60 #define ESPI_CSMODE_INIT_VAL (ESPI_CSMODE_POL_ASSERTED_LOW | \
61 ESPI_CSMODE_CSBEF(0) | ESPI_CSMODE_CSAFT(0) | \
64 #define ESPI_MAX_DATA_TRANSFER_LEN 0xFFF0
66 struct spi_slave
*spi_setup_slave(unsigned int bus
, unsigned int cs
,
67 unsigned int max_hz
, unsigned int mode
)
69 struct fsl_spi_slave
*fsl
;
71 unsigned long spibrg
= 0;
72 unsigned long spi_freq
= 0;
75 if (!spi_cs_is_valid(bus
, cs
))
78 fsl
= spi_alloc_slave(struct fsl_spi_slave
, bus
, cs
);
82 fsl
->espi
= (void *)(CONFIG_SYS_MPC85xx_ESPI_ADDR
);
84 fsl
->max_transfer_length
= ESPI_MAX_DATA_TRANSFER_LEN
;
86 /* Set eSPI BRG clock source */
87 get_sys_info(&sysinfo
);
88 spibrg
= sysinfo
.freq_systembus
/ 2;
90 if ((spibrg
/ max_hz
) > 32) {
91 fsl
->div16
= ESPI_CSMODE_DIV16
;
92 pm
= spibrg
/ (max_hz
* 16 * 2);
95 debug("Requested speed is too low: %d Hz, %ld Hz "
96 "is used.\n", max_hz
, spibrg
/ (32 * 16));
99 pm
= spibrg
/ (max_hz
* 2);
105 spi_freq
= spibrg
/ ((pm
+ 1) * 2 * 16);
107 spi_freq
= spibrg
/ ((pm
+ 1) * 2);
109 /* set tx_timeout to 10 times of one espi FIFO entry go out */
110 fsl
->tx_timeout
= DIV_ROUND_UP((US_PER_SECOND
* ESPI_FIFO_WIDTH_BIT
116 void spi_free_slave(struct spi_slave
*slave
)
118 struct fsl_spi_slave
*fsl
= to_fsl_spi_slave(slave
);
127 int spi_claim_bus(struct spi_slave
*slave
)
129 struct fsl_spi_slave
*fsl
= to_fsl_spi_slave(slave
);
130 ccsr_espi_t
*espi
= fsl
->espi
;
131 unsigned char pm
= fsl
->pm
;
132 unsigned int cs
= slave
->cs
;
133 unsigned int mode
= fsl
->mode
;
134 unsigned int div16
= fsl
->div16
;
137 debug("%s: bus:%i cs:%i\n", __func__
, slave
->bus
, cs
);
139 /* Enable eSPI interface */
140 out_be32(&espi
->mode
, ESPI_MODE_RXTHR(3)
141 | ESPI_MODE_TXTHR(4) | ESPI_MODE_EN
);
143 out_be32(&espi
->event
, 0xffffffff); /* Clear all eSPI events */
144 out_be32(&espi
->mask
, 0x00000000); /* Mask all eSPI interrupts */
146 /* Init CS mode interface */
147 for (i
= 0; i
< ESPI_MAX_CS_NUM
; i
++)
148 out_be32(&espi
->csmode
[i
], ESPI_CSMODE_INIT_VAL
);
150 out_be32(&espi
->csmode
[cs
], in_be32(&espi
->csmode
[cs
]) &
151 ~(ESPI_CSMODE_PM(0xF) | ESPI_CSMODE_DIV16
152 | ESPI_CSMODE_CI_INACTIVEHIGH
| ESPI_CSMODE_CP_BEGIN_EDGCLK
153 | ESPI_CSMODE_REV_MSB_FIRST
| ESPI_CSMODE_LEN(0xF)));
155 /* Set eSPI BRG clock source */
156 out_be32(&espi
->csmode
[cs
], in_be32(&espi
->csmode
[cs
])
157 | ESPI_CSMODE_PM(pm
) | div16
);
161 out_be32(&espi
->csmode
[cs
], in_be32(&espi
->csmode
[cs
])
162 | ESPI_CSMODE_CP_BEGIN_EDGCLK
);
164 out_be32(&espi
->csmode
[cs
], in_be32(&espi
->csmode
[cs
])
165 | ESPI_CSMODE_CI_INACTIVEHIGH
);
167 /* Character bit order: msb first */
168 out_be32(&espi
->csmode
[cs
], in_be32(&espi
->csmode
[cs
])
169 | ESPI_CSMODE_REV_MSB_FIRST
);
171 /* Character length in bits, between 0x3~0xf, i.e. 4bits~16bits */
172 out_be32(&espi
->csmode
[cs
], in_be32(&espi
->csmode
[cs
])
173 | ESPI_CSMODE_LEN(7));
178 void spi_release_bus(struct spi_slave
*slave
)
183 static void fsl_espi_tx(struct fsl_spi_slave
*fsl
, const void *dout
)
185 ccsr_espi_t
*espi
= fsl
->espi
;
186 unsigned int tmpdout
, event
;
190 tmpdout
= *(u32
*)dout
;
194 out_be32(&espi
->tx
, tmpdout
);
195 out_be32(&espi
->event
, ESPI_EV_TNF
);
196 debug("***spi_xfer:...%08x written\n", tmpdout
);
198 tmp_tx_timeout
= fsl
->tx_timeout
;
199 /* Wait for eSPI transmit to go out */
200 while (tmp_tx_timeout
--) {
201 event
= in_be32(&espi
->event
);
202 if (event
& ESPI_EV_DON
|| event
& ESPI_EV_TXE
) {
203 out_be32(&espi
->event
, ESPI_EV_TXE
);
209 if (tmp_tx_timeout
< 0)
210 debug("***spi_xfer:...Tx timeout! event = %08x\n", event
);
213 static int fsl_espi_rx(struct fsl_spi_slave
*fsl
, void *din
, unsigned int bytes
)
215 ccsr_espi_t
*espi
= fsl
->espi
;
216 unsigned int tmpdin
, rx_times
;
217 unsigned char *buf
, *p_cursor
;
222 rx_times
= DIV_ROUND_UP(bytes
, 4);
223 buf
= (unsigned char *)malloc(4 * rx_times
);
225 debug("SF: Failed to malloc memory.\n");
230 tmpdin
= in_be32(&espi
->rx
);
231 debug("***spi_xfer:...%08x readed\n", tmpdin
);
232 *(u32
*)p_cursor
= tmpdin
;
237 memcpy(din
, buf
, bytes
);
240 out_be32(&espi
->event
, ESPI_EV_RNE
);
245 int spi_xfer(struct spi_slave
*slave
, unsigned int bitlen
, const void *data_out
,
246 void *data_in
, unsigned long flags
)
248 struct fsl_spi_slave
*fsl
= to_fsl_spi_slave(slave
);
249 ccsr_espi_t
*espi
= fsl
->espi
;
250 unsigned int event
, rx_bytes
;
251 const void *dout
= NULL
;
254 int num_blks
, num_chunks
, max_tran_len
, tran_len
;
256 unsigned char *buffer
= NULL
;
258 u8
*cmd_buf
= fsl
->cmd_buf
;
259 size_t cmd_len
= fsl
->cmd_len
;
260 size_t data_len
= bitlen
/ 8;
261 size_t rx_offset
= 0;
264 max_tran_len
= fsl
->max_transfer_length
;
267 cmd_len
= fsl
->cmd_len
= data_len
;
268 memcpy(cmd_buf
, data_out
, cmd_len
);
273 spi_cs_deactivate(slave
);
276 buf_len
= 2 * cmd_len
+ min(data_len
, (size_t)max_tran_len
);
277 len
= cmd_len
+ data_len
;
279 buffer
= (unsigned char *)malloc(buf_len
);
281 debug("SF: Failed to malloc memory.\n");
284 memcpy(buffer
, cmd_buf
, cmd_len
);
286 memcpy(buffer
+ cmd_len
, data_out
, data_len
);
288 case SPI_XFER_BEGIN
| SPI_XFER_END
:
290 buffer
= (unsigned char *)malloc(len
* 2);
292 debug("SF: Failed to malloc memory.\n");
295 memcpy(buffer
, data_out
, len
);
301 debug("spi_xfer: data_out %08X(%p) data_in %08X(%p) len %u\n",
302 *(uint
*)data_out
, data_out
, *(uint
*)data_in
, data_in
, len
);
304 num_chunks
= DIV_ROUND_UP(data_len
, max_tran_len
);
305 while (num_chunks
--) {
307 din
= buffer
+ rx_offset
;
309 tran_len
= min(data_len
, (size_t)max_tran_len
);
310 num_blks
= DIV_ROUND_UP(tran_len
+ cmd_len
, 4);
311 num_bytes
= (tran_len
+ cmd_len
) % 4;
312 fsl
->data_len
= tran_len
+ cmd_len
;
313 spi_cs_activate(slave
);
315 /* Clear all eSPI events */
316 out_be32(&espi
->event
, 0xffffffff);
317 /* handle data in 32-bit chunks */
319 event
= in_be32(&espi
->event
);
320 if (event
& ESPI_EV_TNF
) {
321 fsl_espi_tx(fsl
, dout
);
322 /* Set up the next iteration */
329 event
= in_be32(&espi
->event
);
330 if (event
& ESPI_EV_RNE
) {
331 rf_cnt
= ((event
& ESPI_EV_RFCNT_MASK
)
332 >> ESPI_EV_RFCNT_SHIFT
);
335 else if (num_blks
== 1 && rf_cnt
== num_bytes
)
336 rx_bytes
= num_bytes
;
339 if (fsl_espi_rx(fsl
, din
, rx_bytes
)
343 din
= (unsigned char *)din
349 memcpy(data_in
, buffer
+ 2 * cmd_len
, tran_len
);
350 if (*buffer
== 0x0b) {
352 data_len
-= tran_len
;
353 *(int *)buffer
+= tran_len
;
356 spi_cs_deactivate(slave
);
363 int spi_cs_is_valid(unsigned int bus
, unsigned int cs
)
365 return bus
== 0 && cs
< ESPI_MAX_CS_NUM
;
368 void spi_cs_activate(struct spi_slave
*slave
)
370 struct fsl_spi_slave
*fsl
= to_fsl_spi_slave(slave
);
371 ccsr_espi_t
*espi
= fsl
->espi
;
372 unsigned int com
= 0;
373 size_t data_len
= fsl
->data_len
;
375 com
&= ~(ESPI_COM_CS(0x3) | ESPI_COM_TRANLEN(0xFFFF));
376 com
|= ESPI_COM_CS(slave
->cs
);
377 com
|= ESPI_COM_TRANLEN(data_len
- 1);
378 out_be32(&espi
->com
, com
);
381 void spi_cs_deactivate(struct spi_slave
*slave
)
383 struct fsl_spi_slave
*fsl
= to_fsl_spi_slave(slave
);
384 ccsr_espi_t
*espi
= fsl
->espi
;
386 /* clear the RXCNT and TXCNT */
387 out_be32(&espi
->mode
, in_be32(&espi
->mode
) & (~ESPI_MODE_EN
));
388 out_be32(&espi
->mode
, in_be32(&espi
->mode
) | ESPI_MODE_EN
);