1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2010-2019 Intel Corporation
6 #include "ifpga_compat.h"
8 /*transaction opcodes*/
9 #define SPI_TRAN_SEQ_WRITE 0x04 /* SPI transaction sequential write */
10 #define SPI_TRAN_SEQ_READ 0x14 /* SPI transaction sequential read */
11 #define SPI_TRAN_NON_SEQ_WRITE 0x00 /* SPI transaction non-sequential write */
12 #define SPI_TRAN_NON_SEQ_READ 0x10 /* SPI transaction non-sequential read*/
14 /*specail packet characters*/
15 #define SPI_PACKET_SOP 0x7a
16 #define SPI_PACKET_EOP 0x7b
17 #define SPI_PACKET_CHANNEL 0x7c
18 #define SPI_PACKET_ESC 0x7d
20 /*special byte characters*/
21 #define SPI_BYTE_IDLE 0x4a
22 #define SPI_BYTE_ESC 0x4d
24 #define SPI_REG_BYTES 4
26 #define INIT_SPI_TRAN_HEADER(trans_type, size, address) \
28 header.trans_type = trans_type; \
30 header.size = cpu_to_be16(size); \
31 header.addr = cpu_to_be32(addr); \
35 static void print_buffer(const char *string, void *buffer, int len)
38 unsigned char *p = buffer;
40 printf("%s print buffer, len=%d\n", string, len);
42 for (i = 0; i < len; i++)
43 printf("%x ", *(p+i));
47 static void print_buffer(const char *string, void *buffer, int len)
55 static unsigned char xor_20(unsigned char val)
60 static void reorder_phy_data(u8 bits_per_word,
61 void *buf, unsigned int len)
63 unsigned int count = len / (bits_per_word/8);
66 if (bits_per_word == 32) {
81 static int resp_find_sop_eop(unsigned char *resp, unsigned int len,
84 int ret = SPI_NOT_FOUND;
86 unsigned char *b = resp;
89 if (flags != SPI_FOUND_SOP) {
90 while (b < resp + len && *b != SPI_PACKET_SOP)
93 if (*b != SPI_PACKET_SOP)
100 while (b < resp + len && *b != SPI_PACKET_EOP)
103 if (*b != SPI_PACKET_EOP)
112 static int byte_to_core_convert(struct spi_transaction_dev *dev,
113 unsigned int send_len, unsigned char *send_data,
114 unsigned int resp_len, unsigned char *resp_data,
115 unsigned int *valid_resp_len)
119 unsigned char *send_packet = dev->buffer->bytes_send;
120 unsigned char *resp_packet = dev->buffer->bytes_resp;
122 unsigned char current_byte;
123 unsigned char *tx_buffer;
124 unsigned int tx_len = 0;
125 unsigned char *rx_buffer;
126 unsigned int rx_len = 0;
129 unsigned int resp_max_len = 2 * resp_len;
131 print_buffer("before bytes:", send_data, send_len);
135 for (i = 0; i < send_len; i++) {
136 current_byte = send_data[i];
137 switch (current_byte) {
139 *p++ = SPI_BYTE_IDLE;
140 *p++ = xor_20(current_byte);
144 *p++ = xor_20(current_byte);
152 print_buffer("before spi:", send_packet, p-send_packet);
154 reorder_phy_data(32, send_packet, p - send_packet);
156 print_buffer("after order to spi:", send_packet, p-send_packet);
159 tx_buffer = send_packet;
160 tx_len = p - send_packet;
161 rx_buffer = resp_packet;
162 rx_len = resp_max_len;
163 spi_flags = SPI_NOT_FOUND;
166 ret = spi_command(dev->dev, dev->chipselect, tx_len, tx_buffer,
171 print_buffer("read from spi:", rx_buffer, rx_len);
173 /* look for SOP firstly*/
174 ret = resp_find_sop_eop(rx_buffer, rx_len - 1, spi_flags);
175 if (ret != SPI_FOUND_EOP) {
179 dev_err(NULL, "cannot found valid data from SPI\n");
183 if (ret == SPI_FOUND_SOP) {
185 resp_max_len += rx_len;
192 print_buffer("found valid data:", resp_packet, resp_max_len);
194 /* analyze response packet */
197 while (i < resp_max_len) {
198 current_byte = resp_packet[i];
199 switch (current_byte) {
205 current_byte = resp_packet[i];
206 *p++ = xor_20(current_byte);
216 /* receive "4a" means the SPI is idle, not valid data */
217 *valid_resp_len = p - resp_data;
218 if (*valid_resp_len == 0) {
219 dev_err(NULL, "error: repond package without valid data\n");
226 static int packet_to_byte_conver(struct spi_transaction_dev *dev,
227 unsigned int send_len, unsigned char *send_buf,
228 unsigned int resp_len, unsigned char *resp_buf,
233 unsigned char current_byte;
234 unsigned int resp_max_len;
235 unsigned char *send_packet = dev->buffer->packet_send;
236 unsigned char *resp_packet = dev->buffer->packet_resp;
238 unsigned int valid_resp_len = 0;
240 print_buffer("before packet:", send_buf, send_len);
242 resp_max_len = 2 * resp_len + 4;
247 *p++ = SPI_PACKET_SOP;
249 *p++ = SPI_PACKET_CHANNEL;
252 /* append the data into a packet */
253 for (i = 0; i < send_len; i++) {
254 current_byte = send_buf[i];
256 /* EOP for last byte */
257 if (i == send_len - 1)
258 *p++ = SPI_PACKET_EOP;
260 switch (current_byte) {
263 case SPI_PACKET_CHANNEL:
265 *p++ = SPI_PACKET_ESC;
266 *p++ = xor_20(current_byte);
273 ret = byte_to_core_convert(dev, p - send_packet,
274 send_packet, resp_max_len, resp_packet,
279 print_buffer("after byte conver:", resp_packet, valid_resp_len);
281 /* analyze the response packet */
285 for (i = 0; i < valid_resp_len; i++) {
286 if (resp_packet[i] == SPI_PACKET_SOP)
290 if (i == valid_resp_len) {
291 dev_err(NULL, "error on analyze response packet 0x%x\n",
298 /* continue parsing data after SOP */
299 while (i < valid_resp_len) {
300 current_byte = resp_packet[i];
302 switch (current_byte) {
304 case SPI_PACKET_CHANNEL:
307 current_byte = resp_packet[i];
308 *p++ = xor_20(current_byte);
313 current_byte = resp_packet[i];
314 if (current_byte == SPI_PACKET_ESC ||
315 current_byte == SPI_PACKET_CHANNEL ||
316 current_byte == SPI_PACKET_SOP) {
318 current_byte = resp_packet[i];
319 *p++ = xor_20(current_byte);
331 *valid = p - resp_buf;
333 print_buffer("after packet:", resp_buf, *valid);
338 static int do_transaction(struct spi_transaction_dev *dev, unsigned int addr,
339 unsigned int size, unsigned char *data,
340 unsigned int trans_type)
343 struct spi_tran_header header;
344 unsigned char *transaction = dev->buffer->tran_send;
345 unsigned char *response = dev->buffer->tran_resp;
349 unsigned int valid_len = 0;
351 /* make transacation header */
352 INIT_SPI_TRAN_HEADER(trans_type, size, addr);
354 /* fill the header */
356 opae_memcpy(p, &header, sizeof(struct spi_tran_header));
357 p = p + sizeof(struct spi_tran_header);
359 switch (trans_type) {
360 case SPI_TRAN_SEQ_WRITE:
361 case SPI_TRAN_NON_SEQ_WRITE:
362 for (i = 0; i < size; i++)
365 ret = packet_to_byte_conver(dev, size + HEADER_LEN,
366 transaction, RESPONSE_LEN, response,
371 /* check the result */
372 if (size != ((unsigned int)(response[2] & 0xff) << 8 |
373 (unsigned int)(response[3] & 0xff)))
377 case SPI_TRAN_SEQ_READ:
378 case SPI_TRAN_NON_SEQ_READ:
379 ret = packet_to_byte_conver(dev, HEADER_LEN,
380 transaction, size, response,
382 if (ret || valid_len != size)
385 for (i = 0; i < size; i++)
386 *data++ = *response++;
395 int spi_transaction_read(struct spi_transaction_dev *dev, unsigned int addr,
396 unsigned int size, unsigned char *data)
398 return do_transaction(dev, addr, size, data,
399 (size > SPI_REG_BYTES) ?
400 SPI_TRAN_SEQ_READ : SPI_TRAN_NON_SEQ_READ);
403 int spi_transaction_write(struct spi_transaction_dev *dev, unsigned int addr,
404 unsigned int size, unsigned char *data)
406 return do_transaction(dev, addr, size, data,
407 (size > SPI_REG_BYTES) ?
408 SPI_TRAN_SEQ_WRITE : SPI_TRAN_NON_SEQ_WRITE);
411 struct spi_transaction_dev *spi_transaction_init(struct altera_spi_device *dev,
414 struct spi_transaction_dev *spi_tran_dev;
416 spi_tran_dev = opae_malloc(sizeof(struct spi_transaction_dev));
420 spi_tran_dev->dev = dev;
421 spi_tran_dev->chipselect = chipselect;
423 spi_tran_dev->buffer = opae_malloc(sizeof(struct spi_tran_buffer));
424 if (!spi_tran_dev->buffer) {
425 opae_free(spi_tran_dev);
432 void spi_transaction_remove(struct spi_transaction_dev *dev)
434 if (dev && dev->buffer)
435 opae_free(dev->buffer);