4 #include <linux/compiler.h>
6 /*-----------------------------------------------------------------------
9 * This writes "bitlen" bits out the SPI MOSI port and simultaneously clocks
10 * "bitlen" bits in the SPI MISO port. That's just the way SPI works.
12 * The source of the outgoing bits is the "dout" parameter and the
13 * destination of the input bits is the "din" parameter. Note that "dout"
14 * and "din" can point to the same memory location, in which case the
15 * input data overwrites the output data (since both are buffered by
16 * temporary variables, this is OK).
18 * This may be interrupted with Ctrl-C if "intr" is true, otherwise it will
19 * never return an error.
21 static int e1000_spi_xfer(struct e1000_hw *hw, unsigned int bitlen,
22 const void *dout_mem, void *din_mem, bool intr)
24 const uint8_t *dout = dout_mem;
25 uint8_t *din = din_mem;
31 /* Pre-read the control register */
32 eecd = E1000_READ_REG(hw, EECD);
34 /* Iterate over each bit */
35 for (i = 0, mask = 0x80; i < bitlen; i++, mask = (mask >> 1)?:0x80) {
36 /* Check for interrupt */
40 /* Determine the output bit */
41 if (dout && dout[i >> 3] & mask)
42 eecd |= E1000_EECD_DI;
44 eecd &= ~E1000_EECD_DI;
46 /* Write the output bit and wait 50us */
47 E1000_WRITE_REG(hw, EECD, eecd);
48 E1000_WRITE_FLUSH(hw);
51 /* Poke the clock (waits 50us) */
52 e1000_raise_ee_clk(hw, &eecd);
54 /* Now read the input bit */
55 eecd = E1000_READ_REG(hw, EECD);
57 if (eecd & E1000_EECD_DO)
63 /* Poke the clock again (waits 50us) */
64 e1000_lower_ee_clk(hw, &eecd);
67 /* Now clear any remaining bits of the input */
69 din[i >> 3] &= ~((mask << 1) - 1);
74 #ifdef CONFIG_E1000_SPI_GENERIC
75 static inline struct e1000_hw *e1000_hw_from_spi(struct spi_slave *spi)
77 return container_of(spi, struct e1000_hw, spi);
80 struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
81 unsigned int max_hz, unsigned int mode)
83 /* Find the right PCI device */
84 struct e1000_hw *hw = e1000_find_card(bus);
86 printf("ERROR: No such e1000 device: e1000#%u\n", bus);
90 /* Make sure it has an SPI chip */
91 if (hw->eeprom.type != e1000_eeprom_spi) {
92 E1000_ERR(hw, "No attached SPI EEPROM found!\n");
96 /* Argument sanity checks */
98 E1000_ERR(hw, "No such SPI chip: %u\n", cs);
101 if (mode != SPI_MODE_0) {
102 E1000_ERR(hw, "Only SPI MODE-0 is supported!\n");
106 /* TODO: Use max_hz somehow */
107 E1000_DBG(hw->nic, "EEPROM SPI access requested\n");
111 void spi_free_slave(struct spi_slave *spi)
113 __maybe_unused struct e1000_hw *hw = e1000_hw_from_spi(spi);
114 E1000_DBG(hw->nic, "EEPROM SPI access released\n");
117 int spi_claim_bus(struct spi_slave *spi)
119 struct e1000_hw *hw = e1000_hw_from_spi(spi);
121 if (e1000_acquire_eeprom(hw)) {
122 E1000_ERR(hw, "EEPROM SPI cannot be acquired!\n");
129 void spi_release_bus(struct spi_slave *spi)
131 struct e1000_hw *hw = e1000_hw_from_spi(spi);
132 e1000_release_eeprom(hw);
135 /* Skinny wrapper around e1000_spi_xfer */
136 int spi_xfer(struct spi_slave *spi, unsigned int bitlen,
137 const void *dout_mem, void *din_mem, unsigned long flags)
139 struct e1000_hw *hw = e1000_hw_from_spi(spi);
142 if (flags & SPI_XFER_BEGIN)
143 e1000_standby_eeprom(hw);
145 ret = e1000_spi_xfer(hw, bitlen, dout_mem, din_mem, true);
147 if (flags & SPI_XFER_END)
148 e1000_standby_eeprom(hw);
153 #endif /* not CONFIG_E1000_SPI_GENERIC */
155 #ifdef CONFIG_CMD_E1000
157 /* The EEPROM opcodes */
158 #define SPI_EEPROM_ENABLE_WR 0x06
159 #define SPI_EEPROM_DISABLE_WR 0x04
160 #define SPI_EEPROM_WRITE_STATUS 0x01
161 #define SPI_EEPROM_READ_STATUS 0x05
162 #define SPI_EEPROM_WRITE_PAGE 0x02
163 #define SPI_EEPROM_READ_PAGE 0x03
165 /* The EEPROM status bits */
166 #define SPI_EEPROM_STATUS_BUSY 0x01
167 #define SPI_EEPROM_STATUS_WREN 0x02
169 static int e1000_spi_eeprom_enable_wr(struct e1000_hw *hw, bool intr)
171 u8 op[] = { SPI_EEPROM_ENABLE_WR };
172 e1000_standby_eeprom(hw);
173 return e1000_spi_xfer(hw, 8*sizeof(op), op, NULL, intr);
177 * These have been tested to perform correctly, but they are not used by any
178 * of the EEPROM commands at this time.
180 static __maybe_unused int e1000_spi_eeprom_disable_wr(struct e1000_hw *hw,
183 u8 op[] = { SPI_EEPROM_DISABLE_WR };
184 e1000_standby_eeprom(hw);
185 return e1000_spi_xfer(hw, 8*sizeof(op), op, NULL, intr);
188 static __maybe_unused int e1000_spi_eeprom_write_status(struct e1000_hw *hw,
189 u8 status, bool intr)
191 u8 op[] = { SPI_EEPROM_WRITE_STATUS, status };
192 e1000_standby_eeprom(hw);
193 return e1000_spi_xfer(hw, 8*sizeof(op), op, NULL, intr);
196 static int e1000_spi_eeprom_read_status(struct e1000_hw *hw, bool intr)
198 u8 op[] = { SPI_EEPROM_READ_STATUS, 0 };
199 e1000_standby_eeprom(hw);
200 if (e1000_spi_xfer(hw, 8*sizeof(op), op, op, intr))
205 static int e1000_spi_eeprom_write_page(struct e1000_hw *hw,
206 const void *data, u16 off, u16 len, bool intr)
209 SPI_EEPROM_WRITE_PAGE,
210 (off >> (hw->eeprom.address_bits - 8)) & 0xff, off & 0xff
213 e1000_standby_eeprom(hw);
215 if (e1000_spi_xfer(hw, 8 + hw->eeprom.address_bits, op, NULL, intr))
217 if (e1000_spi_xfer(hw, len << 3, data, NULL, intr))
223 static int e1000_spi_eeprom_read_page(struct e1000_hw *hw,
224 void *data, u16 off, u16 len, bool intr)
227 SPI_EEPROM_READ_PAGE,
228 (off >> (hw->eeprom.address_bits - 8)) & 0xff, off & 0xff
231 e1000_standby_eeprom(hw);
233 if (e1000_spi_xfer(hw, 8 + hw->eeprom.address_bits, op, NULL, intr))
235 if (e1000_spi_xfer(hw, len << 3, NULL, data, intr))
241 static int e1000_spi_eeprom_poll_ready(struct e1000_hw *hw, bool intr)
244 while ((status = e1000_spi_eeprom_read_status(hw, intr)) >= 0) {
245 if (!(status & SPI_EEPROM_STATUS_BUSY))
251 static int e1000_spi_eeprom_dump(struct e1000_hw *hw,
252 void *data, u16 off, unsigned int len, bool intr)
254 /* Interruptibly wait for the EEPROM to be ready */
255 if (e1000_spi_eeprom_poll_ready(hw, intr))
258 /* Dump each page in sequence */
260 /* Calculate the data bytes on this page */
261 u16 pg_off = off & (hw->eeprom.page_size - 1);
262 u16 pg_len = hw->eeprom.page_size - pg_off;
266 /* Now dump the page */
267 if (e1000_spi_eeprom_read_page(hw, data, off, pg_len, intr))
270 /* Otherwise go on to the next page */
280 static int e1000_spi_eeprom_program(struct e1000_hw *hw,
281 const void *data, u16 off, u16 len, bool intr)
283 /* Program each page in sequence */
285 /* Calculate the data bytes on this page */
286 u16 pg_off = off & (hw->eeprom.page_size - 1);
287 u16 pg_len = hw->eeprom.page_size - pg_off;
291 /* Interruptibly wait for the EEPROM to be ready */
292 if (e1000_spi_eeprom_poll_ready(hw, intr))
295 /* Enable write access */
296 if (e1000_spi_eeprom_enable_wr(hw, intr))
299 /* Now program the page */
300 if (e1000_spi_eeprom_write_page(hw, data, off, pg_len, intr))
303 /* Otherwise go on to the next page */
309 /* Wait for the last write to complete */
310 if (e1000_spi_eeprom_poll_ready(hw, intr))
317 static int do_e1000_spi_show(cmd_tbl_t *cmdtp, struct e1000_hw *hw,
318 int argc, char * const argv[])
320 unsigned int length = 0;
330 /* Parse the offset and length */
332 offset = simple_strtoul(argv[0], NULL, 0);
334 length = simple_strtoul(argv[1], NULL, 0);
335 else if (offset < (hw->eeprom.word_size << 1))
336 length = (hw->eeprom.word_size << 1) - offset;
338 /* Extra sanity checks */
340 E1000_ERR(hw, "Requested zero-sized dump!\n");
343 if ((0x10000 < length) || (0x10000 - length < offset)) {
344 E1000_ERR(hw, "Can't dump past 0xFFFF!\n");
348 /* Allocate a buffer to hold stuff */
349 buffer = malloc(length);
351 E1000_ERR(hw, "Out of Memory!\n");
355 /* Acquire the EEPROM and perform the dump */
356 if (e1000_acquire_eeprom(hw)) {
357 E1000_ERR(hw, "EEPROM SPI cannot be acquired!\n");
361 err = e1000_spi_eeprom_dump(hw, buffer, offset, length, true);
362 e1000_release_eeprom(hw);
364 E1000_ERR(hw, "Interrupted!\n");
369 /* Now hexdump the result */
370 printf("%s: ===== Intel e1000 EEPROM (0x%04hX - 0x%04hX) =====",
371 hw->name, offset, offset + length - 1);
372 for (i = 0; i < length; i++) {
374 printf("\n%s: %04hX: ", hw->name, offset + i);
375 else if ((i & 0xF) == 0x8)
377 printf(" %02hx", buffer[i]);
386 static int do_e1000_spi_dump(cmd_tbl_t *cmdtp, struct e1000_hw *hw,
387 int argc, char * const argv[])
398 /* Parse the arguments */
399 dest = (void *)simple_strtoul(argv[0], NULL, 16);
400 offset = simple_strtoul(argv[1], NULL, 0);
401 length = simple_strtoul(argv[2], NULL, 0);
403 /* Extra sanity checks */
405 E1000_ERR(hw, "Requested zero-sized dump!\n");
408 if ((0x10000 < length) || (0x10000 - length < offset)) {
409 E1000_ERR(hw, "Can't dump past 0xFFFF!\n");
413 /* Acquire the EEPROM */
414 if (e1000_acquire_eeprom(hw)) {
415 E1000_ERR(hw, "EEPROM SPI cannot be acquired!\n");
419 /* Perform the programming operation */
420 if (e1000_spi_eeprom_dump(hw, dest, offset, length, true) < 0) {
421 E1000_ERR(hw, "Interrupted!\n");
422 e1000_release_eeprom(hw);
426 e1000_release_eeprom(hw);
427 printf("%s: ===== EEPROM DUMP COMPLETE =====\n", hw->name);
431 static int do_e1000_spi_program(cmd_tbl_t *cmdtp, struct e1000_hw *hw,
432 int argc, char * const argv[])
443 /* Parse the arguments */
444 source = (const void *)simple_strtoul(argv[0], NULL, 16);
445 offset = simple_strtoul(argv[1], NULL, 0);
446 length = simple_strtoul(argv[2], NULL, 0);
448 /* Acquire the EEPROM */
449 if (e1000_acquire_eeprom(hw)) {
450 E1000_ERR(hw, "EEPROM SPI cannot be acquired!\n");
454 /* Perform the programming operation */
455 if (e1000_spi_eeprom_program(hw, source, offset, length, true) < 0) {
456 E1000_ERR(hw, "Interrupted!\n");
457 e1000_release_eeprom(hw);
461 e1000_release_eeprom(hw);
462 printf("%s: ===== EEPROM PROGRAMMED =====\n", hw->name);
466 static int do_e1000_spi_checksum(cmd_tbl_t *cmdtp, struct e1000_hw *hw,
467 int argc, char * const argv[])
469 uint16_t i, length, checksum = 0, checksum_reg;
475 else if ((argc == 1) && !strcmp(argv[0], "update"))
482 /* Allocate a temporary buffer */
483 length = sizeof(uint16_t) * (EEPROM_CHECKSUM_REG + 1);
484 buffer = malloc(length);
486 E1000_ERR(hw, "Unable to allocate EEPROM buffer!\n");
490 /* Acquire the EEPROM */
491 if (e1000_acquire_eeprom(hw)) {
492 E1000_ERR(hw, "EEPROM SPI cannot be acquired!\n");
496 /* Read the EEPROM */
497 if (e1000_spi_eeprom_dump(hw, buffer, 0, length, true) < 0) {
498 E1000_ERR(hw, "Interrupted!\n");
499 e1000_release_eeprom(hw);
503 /* Compute the checksum and read the expected value */
504 for (i = 0; i < EEPROM_CHECKSUM_REG; i++)
505 checksum += le16_to_cpu(buffer[i]);
506 checksum = ((uint16_t)EEPROM_SUM) - checksum;
507 checksum_reg = le16_to_cpu(buffer[i]);
510 if (checksum_reg == checksum) {
511 printf("%s: INFO: EEPROM checksum is correct! (0x%04hx)\n",
513 e1000_release_eeprom(hw);
517 /* Hrm, verification failed, print an error */
518 E1000_ERR(hw, "EEPROM checksum is incorrect!\n");
519 E1000_ERR(hw, " ...register was 0x%04hx, calculated 0x%04hx\n",
520 checksum_reg, checksum);
522 /* If they didn't ask us to update it, just return an error */
524 e1000_release_eeprom(hw);
528 /* Ok, correct it! */
529 printf("%s: Reprogramming the EEPROM checksum...\n", hw->name);
530 buffer[i] = cpu_to_le16(checksum);
531 if (e1000_spi_eeprom_program(hw, &buffer[i], i * sizeof(uint16_t),
532 sizeof(uint16_t), true)) {
533 E1000_ERR(hw, "Interrupted!\n");
534 e1000_release_eeprom(hw);
538 e1000_release_eeprom(hw);
542 int do_e1000_spi(cmd_tbl_t *cmdtp, struct e1000_hw *hw,
543 int argc, char * const argv[])
550 /* Make sure it has an SPI chip */
551 if (hw->eeprom.type != e1000_eeprom_spi) {
552 E1000_ERR(hw, "No attached SPI EEPROM found (%d)!\n",
557 /* Check the eeprom sub-sub-command arguments */
558 if (!strcmp(argv[0], "show"))
559 return do_e1000_spi_show(cmdtp, hw, argc - 1, argv + 1);
561 if (!strcmp(argv[0], "dump"))
562 return do_e1000_spi_dump(cmdtp, hw, argc - 1, argv + 1);
564 if (!strcmp(argv[0], "program"))
565 return do_e1000_spi_program(cmdtp, hw, argc - 1, argv + 1);
567 if (!strcmp(argv[0], "checksum"))
568 return do_e1000_spi_checksum(cmdtp, hw, argc - 1, argv + 1);
574 #endif /* not CONFIG_CMD_E1000 */