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 /* Not sure why all of these are necessary */
81 void spi_init(void) { /* Nothing to do */ }
83 struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
84 unsigned int max_hz, unsigned int mode)
86 /* Find the right PCI device */
87 struct e1000_hw *hw = e1000_find_card(bus);
89 printf("ERROR: No such e1000 device: e1000#%u\n", bus);
93 /* Make sure it has an SPI chip */
94 if (hw->eeprom.type != e1000_eeprom_spi) {
95 E1000_ERR(hw, "No attached SPI EEPROM found!\n");
99 /* Argument sanity checks */
101 E1000_ERR(hw, "No such SPI chip: %u\n", cs);
104 if (mode != SPI_MODE_0) {
105 E1000_ERR(hw, "Only SPI MODE-0 is supported!\n");
109 /* TODO: Use max_hz somehow */
110 E1000_DBG(hw->nic, "EEPROM SPI access requested\n");
114 void spi_free_slave(struct spi_slave *spi)
116 __maybe_unused struct e1000_hw *hw = e1000_hw_from_spi(spi);
117 E1000_DBG(hw->nic, "EEPROM SPI access released\n");
120 int spi_claim_bus(struct spi_slave *spi)
122 struct e1000_hw *hw = e1000_hw_from_spi(spi);
124 if (e1000_acquire_eeprom(hw)) {
125 E1000_ERR(hw, "EEPROM SPI cannot be acquired!\n");
132 void spi_release_bus(struct spi_slave *spi)
134 struct e1000_hw *hw = e1000_hw_from_spi(spi);
135 e1000_release_eeprom(hw);
138 /* Skinny wrapper around e1000_spi_xfer */
139 int spi_xfer(struct spi_slave *spi, unsigned int bitlen,
140 const void *dout_mem, void *din_mem, unsigned long flags)
142 struct e1000_hw *hw = e1000_hw_from_spi(spi);
145 if (flags & SPI_XFER_BEGIN)
146 e1000_standby_eeprom(hw);
148 ret = e1000_spi_xfer(hw, bitlen, dout_mem, din_mem, true);
150 if (flags & SPI_XFER_END)
151 e1000_standby_eeprom(hw);
156 #endif /* not CONFIG_E1000_SPI_GENERIC */
158 #ifdef CONFIG_CMD_E1000
160 /* The EEPROM opcodes */
161 #define SPI_EEPROM_ENABLE_WR 0x06
162 #define SPI_EEPROM_DISABLE_WR 0x04
163 #define SPI_EEPROM_WRITE_STATUS 0x01
164 #define SPI_EEPROM_READ_STATUS 0x05
165 #define SPI_EEPROM_WRITE_PAGE 0x02
166 #define SPI_EEPROM_READ_PAGE 0x03
168 /* The EEPROM status bits */
169 #define SPI_EEPROM_STATUS_BUSY 0x01
170 #define SPI_EEPROM_STATUS_WREN 0x02
172 static int e1000_spi_eeprom_enable_wr(struct e1000_hw *hw, bool intr)
174 u8 op[] = { SPI_EEPROM_ENABLE_WR };
175 e1000_standby_eeprom(hw);
176 return e1000_spi_xfer(hw, 8*sizeof(op), op, NULL, intr);
180 * These have been tested to perform correctly, but they are not used by any
181 * of the EEPROM commands at this time.
183 static __maybe_unused int e1000_spi_eeprom_disable_wr(struct e1000_hw *hw,
186 u8 op[] = { SPI_EEPROM_DISABLE_WR };
187 e1000_standby_eeprom(hw);
188 return e1000_spi_xfer(hw, 8*sizeof(op), op, NULL, intr);
191 static __maybe_unused int e1000_spi_eeprom_write_status(struct e1000_hw *hw,
192 u8 status, bool intr)
194 u8 op[] = { SPI_EEPROM_WRITE_STATUS, status };
195 e1000_standby_eeprom(hw);
196 return e1000_spi_xfer(hw, 8*sizeof(op), op, NULL, intr);
199 static int e1000_spi_eeprom_read_status(struct e1000_hw *hw, bool intr)
201 u8 op[] = { SPI_EEPROM_READ_STATUS, 0 };
202 e1000_standby_eeprom(hw);
203 if (e1000_spi_xfer(hw, 8*sizeof(op), op, op, intr))
208 static int e1000_spi_eeprom_write_page(struct e1000_hw *hw,
209 const void *data, u16 off, u16 len, bool intr)
212 SPI_EEPROM_WRITE_PAGE,
213 (off >> (hw->eeprom.address_bits - 8)) & 0xff, off & 0xff
216 e1000_standby_eeprom(hw);
218 if (e1000_spi_xfer(hw, 8 + hw->eeprom.address_bits, op, NULL, intr))
220 if (e1000_spi_xfer(hw, len << 3, data, NULL, intr))
226 static int e1000_spi_eeprom_read_page(struct e1000_hw *hw,
227 void *data, u16 off, u16 len, bool intr)
230 SPI_EEPROM_READ_PAGE,
231 (off >> (hw->eeprom.address_bits - 8)) & 0xff, off & 0xff
234 e1000_standby_eeprom(hw);
236 if (e1000_spi_xfer(hw, 8 + hw->eeprom.address_bits, op, NULL, intr))
238 if (e1000_spi_xfer(hw, len << 3, NULL, data, intr))
244 static int e1000_spi_eeprom_poll_ready(struct e1000_hw *hw, bool intr)
247 while ((status = e1000_spi_eeprom_read_status(hw, intr)) >= 0) {
248 if (!(status & SPI_EEPROM_STATUS_BUSY))
254 static int e1000_spi_eeprom_dump(struct e1000_hw *hw,
255 void *data, u16 off, unsigned int len, bool intr)
257 /* Interruptibly wait for the EEPROM to be ready */
258 if (e1000_spi_eeprom_poll_ready(hw, intr))
261 /* Dump each page in sequence */
263 /* Calculate the data bytes on this page */
264 u16 pg_off = off & (hw->eeprom.page_size - 1);
265 u16 pg_len = hw->eeprom.page_size - pg_off;
269 /* Now dump the page */
270 if (e1000_spi_eeprom_read_page(hw, data, off, pg_len, intr))
273 /* Otherwise go on to the next page */
283 static int e1000_spi_eeprom_program(struct e1000_hw *hw,
284 const void *data, u16 off, u16 len, bool intr)
286 /* Program each page in sequence */
288 /* Calculate the data bytes on this page */
289 u16 pg_off = off & (hw->eeprom.page_size - 1);
290 u16 pg_len = hw->eeprom.page_size - pg_off;
294 /* Interruptibly wait for the EEPROM to be ready */
295 if (e1000_spi_eeprom_poll_ready(hw, intr))
298 /* Enable write access */
299 if (e1000_spi_eeprom_enable_wr(hw, intr))
302 /* Now program the page */
303 if (e1000_spi_eeprom_write_page(hw, data, off, pg_len, intr))
306 /* Otherwise go on to the next page */
312 /* Wait for the last write to complete */
313 if (e1000_spi_eeprom_poll_ready(hw, intr))
320 static int do_e1000_spi_show(cmd_tbl_t *cmdtp, struct e1000_hw *hw,
321 int argc, char * const argv[])
323 unsigned int length = 0;
333 /* Parse the offset and length */
335 offset = simple_strtoul(argv[0], NULL, 0);
337 length = simple_strtoul(argv[1], NULL, 0);
338 else if (offset < (hw->eeprom.word_size << 1))
339 length = (hw->eeprom.word_size << 1) - offset;
341 /* Extra sanity checks */
343 E1000_ERR(hw, "Requested zero-sized dump!\n");
346 if ((0x10000 < length) || (0x10000 - length < offset)) {
347 E1000_ERR(hw, "Can't dump past 0xFFFF!\n");
351 /* Allocate a buffer to hold stuff */
352 buffer = malloc(length);
354 E1000_ERR(hw, "Out of Memory!\n");
358 /* Acquire the EEPROM and perform the dump */
359 if (e1000_acquire_eeprom(hw)) {
360 E1000_ERR(hw, "EEPROM SPI cannot be acquired!\n");
364 err = e1000_spi_eeprom_dump(hw, buffer, offset, length, true);
365 e1000_release_eeprom(hw);
367 E1000_ERR(hw, "Interrupted!\n");
372 /* Now hexdump the result */
373 printf("%s: ===== Intel e1000 EEPROM (0x%04hX - 0x%04hX) =====",
374 hw->name, offset, offset + length - 1);
375 for (i = 0; i < length; i++) {
377 printf("\n%s: %04hX: ", hw->name, offset + i);
378 else if ((i & 0xF) == 0x8)
380 printf(" %02hx", buffer[i]);
389 static int do_e1000_spi_dump(cmd_tbl_t *cmdtp, struct e1000_hw *hw,
390 int argc, char * const argv[])
401 /* Parse the arguments */
402 dest = (void *)simple_strtoul(argv[0], NULL, 16);
403 offset = simple_strtoul(argv[1], NULL, 0);
404 length = simple_strtoul(argv[2], NULL, 0);
406 /* Extra sanity checks */
408 E1000_ERR(hw, "Requested zero-sized dump!\n");
411 if ((0x10000 < length) || (0x10000 - length < offset)) {
412 E1000_ERR(hw, "Can't dump past 0xFFFF!\n");
416 /* Acquire the EEPROM */
417 if (e1000_acquire_eeprom(hw)) {
418 E1000_ERR(hw, "EEPROM SPI cannot be acquired!\n");
422 /* Perform the programming operation */
423 if (e1000_spi_eeprom_dump(hw, dest, offset, length, true) < 0) {
424 E1000_ERR(hw, "Interrupted!\n");
425 e1000_release_eeprom(hw);
429 e1000_release_eeprom(hw);
430 printf("%s: ===== EEPROM DUMP COMPLETE =====\n", hw->name);
434 static int do_e1000_spi_program(cmd_tbl_t *cmdtp, struct e1000_hw *hw,
435 int argc, char * const argv[])
446 /* Parse the arguments */
447 source = (const void *)simple_strtoul(argv[0], NULL, 16);
448 offset = simple_strtoul(argv[1], NULL, 0);
449 length = simple_strtoul(argv[2], NULL, 0);
451 /* Acquire the EEPROM */
452 if (e1000_acquire_eeprom(hw)) {
453 E1000_ERR(hw, "EEPROM SPI cannot be acquired!\n");
457 /* Perform the programming operation */
458 if (e1000_spi_eeprom_program(hw, source, offset, length, true) < 0) {
459 E1000_ERR(hw, "Interrupted!\n");
460 e1000_release_eeprom(hw);
464 e1000_release_eeprom(hw);
465 printf("%s: ===== EEPROM PROGRAMMED =====\n", hw->name);
469 static int do_e1000_spi_checksum(cmd_tbl_t *cmdtp, struct e1000_hw *hw,
470 int argc, char * const argv[])
472 uint16_t i, length, checksum = 0, checksum_reg;
478 else if ((argc == 1) && !strcmp(argv[0], "update"))
485 /* Allocate a temporary buffer */
486 length = sizeof(uint16_t) * (EEPROM_CHECKSUM_REG + 1);
487 buffer = malloc(length);
489 E1000_ERR(hw, "Unable to allocate EEPROM buffer!\n");
493 /* Acquire the EEPROM */
494 if (e1000_acquire_eeprom(hw)) {
495 E1000_ERR(hw, "EEPROM SPI cannot be acquired!\n");
499 /* Read the EEPROM */
500 if (e1000_spi_eeprom_dump(hw, buffer, 0, length, true) < 0) {
501 E1000_ERR(hw, "Interrupted!\n");
502 e1000_release_eeprom(hw);
506 /* Compute the checksum and read the expected value */
507 for (i = 0; i < EEPROM_CHECKSUM_REG; i++)
508 checksum += le16_to_cpu(buffer[i]);
509 checksum = ((uint16_t)EEPROM_SUM) - checksum;
510 checksum_reg = le16_to_cpu(buffer[i]);
513 if (checksum_reg == checksum) {
514 printf("%s: INFO: EEPROM checksum is correct! (0x%04hx)\n",
516 e1000_release_eeprom(hw);
520 /* Hrm, verification failed, print an error */
521 E1000_ERR(hw, "EEPROM checksum is incorrect!\n");
522 E1000_ERR(hw, " ...register was 0x%04hx, calculated 0x%04hx\n",
523 checksum_reg, checksum);
525 /* If they didn't ask us to update it, just return an error */
527 e1000_release_eeprom(hw);
531 /* Ok, correct it! */
532 printf("%s: Reprogramming the EEPROM checksum...\n", hw->name);
533 buffer[i] = cpu_to_le16(checksum);
534 if (e1000_spi_eeprom_program(hw, &buffer[i], i * sizeof(uint16_t),
535 sizeof(uint16_t), true)) {
536 E1000_ERR(hw, "Interrupted!\n");
537 e1000_release_eeprom(hw);
541 e1000_release_eeprom(hw);
545 int do_e1000_spi(cmd_tbl_t *cmdtp, struct e1000_hw *hw,
546 int argc, char * const argv[])
553 /* Make sure it has an SPI chip */
554 if (hw->eeprom.type != e1000_eeprom_spi) {
555 E1000_ERR(hw, "No attached SPI EEPROM found (%d)!\n",
560 /* Check the eeprom sub-sub-command arguments */
561 if (!strcmp(argv[0], "show"))
562 return do_e1000_spi_show(cmdtp, hw, argc - 1, argv + 1);
564 if (!strcmp(argv[0], "dump"))
565 return do_e1000_spi_dump(cmdtp, hw, argc - 1, argv + 1);
567 if (!strcmp(argv[0], "program"))
568 return do_e1000_spi_program(cmdtp, hw, argc - 1, argv + 1);
570 if (!strcmp(argv[0], "checksum"))
571 return do_e1000_spi_checksum(cmdtp, hw, argc - 1, argv + 1);
577 #endif /* not CONFIG_CMD_E1000 */