2 * Copyright (c) 2011-12 The Chromium OS Authors.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License as
6 * published by the Free Software Foundation; either version 2 of
7 * the License, or (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but without any warranty; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
19 * This file is derived from the flashrom project.
31 #define SPI_OPCODE_WREN 0x06
32 #define SPI_OPCODE_FAST_READ 0x0b
35 pci_dev_t dev; /* PCI device number */
36 int ich_version; /* Controller version, 7 or 9 */
41 void *base; /* Base of register set */
50 uint32_t *pr; /* only for ich9 */
51 uint8_t *speed; /* pointer to speed control */
52 ulong max_speed; /* Maximum bus speed in MHz */
57 static inline struct ich_spi_slave *to_ich_spi(struct spi_slave *slave)
59 return container_of(slave, struct ich_spi_slave, slave);
62 static unsigned int ich_reg(const void *addr)
64 return (unsigned)(addr - ctlr.base) & 0xffff;
67 static u8 ich_readb(const void *addr)
69 u8 value = readb(addr);
71 debug("read %2.2x from %4.4x\n", value, ich_reg(addr));
76 static u16 ich_readw(const void *addr)
78 u16 value = readw(addr);
80 debug("read %4.4x from %4.4x\n", value, ich_reg(addr));
85 static u32 ich_readl(const void *addr)
87 u32 value = readl(addr);
89 debug("read %8.8x from %4.4x\n", value, ich_reg(addr));
94 static void ich_writeb(u8 value, void *addr)
97 debug("wrote %2.2x to %4.4x\n", value, ich_reg(addr));
100 static void ich_writew(u16 value, void *addr)
103 debug("wrote %4.4x to %4.4x\n", value, ich_reg(addr));
106 static void ich_writel(u32 value, void *addr)
109 debug("wrote %8.8x to %4.4x\n", value, ich_reg(addr));
112 static void write_reg(const void *value, void *dest, uint32_t size)
114 memcpy_toio(dest, value, size);
117 static void read_reg(const void *src, void *value, uint32_t size)
119 memcpy_fromio(value, src, size);
122 static void ich_set_bbar(struct ich_ctlr *ctlr, uint32_t minaddr)
124 const uint32_t bbar_mask = 0x00ffff00;
125 uint32_t ichspi_bbar;
127 minaddr &= bbar_mask;
128 ichspi_bbar = ich_readl(ctlr->bbar) & ~bbar_mask;
129 ichspi_bbar |= minaddr;
130 ich_writel(ichspi_bbar, ctlr->bbar);
133 int spi_cs_is_valid(unsigned int bus, unsigned int cs)
135 puts("spi_cs_is_valid used but not implemented\n");
139 struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
140 unsigned int max_hz, unsigned int mode)
142 struct ich_spi_slave *ich;
144 ich = spi_alloc_slave(struct ich_spi_slave, bus, cs);
146 puts("ICH SPI: Out of memory\n");
155 void spi_free_slave(struct spi_slave *slave)
157 struct ich_spi_slave *ich = to_ich_spi(slave);
163 * Check if this device ID matches one of supported Intel PCH devices.
165 * Return the ICH version if there is a match, or zero otherwise.
167 static int get_ich_version(uint16_t device_id)
169 if (device_id == PCI_DEVICE_ID_INTEL_TGP_LPC)
172 if ((device_id >= PCI_DEVICE_ID_INTEL_COUGARPOINT_LPC_MIN &&
173 device_id <= PCI_DEVICE_ID_INTEL_COUGARPOINT_LPC_MAX) ||
174 (device_id >= PCI_DEVICE_ID_INTEL_PANTHERPOINT_LPC_MIN &&
175 device_id <= PCI_DEVICE_ID_INTEL_PANTHERPOINT_LPC_MAX))
181 /* @return 1 if the SPI flash supports the 33MHz speed */
182 static int ich9_can_do_33mhz(pci_dev_t dev)
186 /* Observe SPI Descriptor Component Section 0 */
187 pci_write_config_dword(dev, 0xb0, 0x1000);
189 /* Extract the Write/Erase SPI Frequency from descriptor */
190 pci_read_config_dword(dev, 0xb4, &fdod);
192 /* Bits 23:21 have the fast read clock frequency, 0=20MHz, 1=33MHz */
193 speed = (fdod >> 21) & 7;
198 static int ich_find_spi_controller(pci_dev_t *devp, int *ich_versionp)
200 int last_bus = pci_last_busno();
203 if (last_bus == -1) {
204 debug("No PCI busses?\n");
208 for (bus = 0; bus <= last_bus; bus++) {
209 uint16_t vendor_id, device_id;
213 dev = PCI_BDF(bus, 31, 0);
214 pci_read_config_dword(dev, 0, &ids);
216 device_id = ids >> 16;
218 if (vendor_id == PCI_VENDOR_ID_INTEL) {
220 *ich_versionp = get_ich_version(device_id);
225 debug("ICH SPI: No ICH found.\n");
229 static int ich_init_controller(struct ich_ctlr *ctlr)
231 uint8_t *rcrb; /* Root Complex Register Block */
232 uint32_t rcba; /* Root Complex Base Address */
234 pci_read_config_dword(ctlr->dev, 0xf0, &rcba);
235 /* Bits 31-14 are the base address, 13-1 are reserved, 0 is enable. */
236 rcrb = (uint8_t *)(rcba & 0xffffc000);
237 if (ctlr->ich_version == 7) {
238 struct ich7_spi_regs *ich7_spi;
240 ich7_spi = (struct ich7_spi_regs *)(rcrb + 0x3020);
241 ctlr->ichspi_lock = ich_readw(&ich7_spi->spis) & SPIS_LOCK;
242 ctlr->opmenu = ich7_spi->opmenu;
243 ctlr->menubytes = sizeof(ich7_spi->opmenu);
244 ctlr->optype = &ich7_spi->optype;
245 ctlr->addr = &ich7_spi->spia;
246 ctlr->data = (uint8_t *)ich7_spi->spid;
247 ctlr->databytes = sizeof(ich7_spi->spid);
248 ctlr->status = (uint8_t *)&ich7_spi->spis;
249 ctlr->control = &ich7_spi->spic;
250 ctlr->bbar = &ich7_spi->bbar;
251 ctlr->preop = &ich7_spi->preop;
252 ctlr->base = ich7_spi;
253 } else if (ctlr->ich_version == 9) {
254 struct ich9_spi_regs *ich9_spi;
256 ich9_spi = (struct ich9_spi_regs *)(rcrb + 0x3800);
257 ctlr->ichspi_lock = ich_readw(&ich9_spi->hsfs) & HSFS_FLOCKDN;
258 ctlr->opmenu = ich9_spi->opmenu;
259 ctlr->menubytes = sizeof(ich9_spi->opmenu);
260 ctlr->optype = &ich9_spi->optype;
261 ctlr->addr = &ich9_spi->faddr;
262 ctlr->data = (uint8_t *)ich9_spi->fdata;
263 ctlr->databytes = sizeof(ich9_spi->fdata);
264 ctlr->status = &ich9_spi->ssfs;
265 ctlr->control = (uint16_t *)ich9_spi->ssfc;
266 ctlr->speed = ich9_spi->ssfc + 2;
267 ctlr->bbar = &ich9_spi->bbar;
268 ctlr->preop = &ich9_spi->preop;
269 ctlr->pr = &ich9_spi->pr[0];
270 ctlr->base = ich9_spi;
272 debug("ICH SPI: Unrecognized ICH version %d.\n",
276 debug("ICH SPI: Version %d detected\n", ctlr->ich_version);
278 /* Work out the maximum speed we can support */
279 ctlr->max_speed = 20000000;
280 if (ctlr->ich_version == 9 && ich9_can_do_33mhz(ctlr->dev))
281 ctlr->max_speed = 33000000;
283 ich_set_bbar(ctlr, 0);
292 if (ich_find_spi_controller(&ctlr.dev, &ctlr.ich_version)) {
293 printf("ICH SPI: Cannot find device\n");
297 if (ich_init_controller(&ctlr)) {
298 printf("ICH SPI: Cannot setup controller\n");
303 * Disable the BIOS write protect so write commands are allowed. On
304 * v9, deassert SMM BIOS Write Protect Disable.
306 pci_read_config_byte(ctlr.dev, 0xdc, &bios_cntl);
307 if (ctlr.ich_version == 9)
308 bios_cntl &= ~(1 << 5);
309 pci_write_config_byte(ctlr.dev, 0xdc, bios_cntl | 0x1);
312 int spi_claim_bus(struct spi_slave *slave)
314 /* Handled by ICH automatically. */
318 void spi_release_bus(struct spi_slave *slave)
320 /* Handled by ICH automatically. */
323 void spi_cs_activate(struct spi_slave *slave)
325 /* Handled by ICH automatically. */
328 void spi_cs_deactivate(struct spi_slave *slave)
330 /* Handled by ICH automatically. */
333 static inline void spi_use_out(struct spi_trans *trans, unsigned bytes)
336 trans->bytesout -= bytes;
339 static inline void spi_use_in(struct spi_trans *trans, unsigned bytes)
342 trans->bytesin -= bytes;
345 static void spi_setup_type(struct spi_trans *trans, int data_bytes)
349 /* Try to guess spi type from read/write sizes. */
350 if (trans->bytesin == 0) {
351 if (trans->bytesout + data_bytes > 4)
353 * If bytesin = 0 and bytesout > 4, we presume this is
354 * a write data operation, which is accompanied by an
357 trans->type = SPI_OPCODE_TYPE_WRITE_WITH_ADDRESS;
359 trans->type = SPI_OPCODE_TYPE_WRITE_NO_ADDRESS;
363 if (trans->bytesout == 1) { /* and bytesin is > 0 */
364 trans->type = SPI_OPCODE_TYPE_READ_NO_ADDRESS;
368 if (trans->bytesout == 4) /* and bytesin is > 0 */
369 trans->type = SPI_OPCODE_TYPE_READ_WITH_ADDRESS;
371 /* Fast read command is called with 5 bytes instead of 4 */
372 if (trans->out[0] == SPI_OPCODE_FAST_READ && trans->bytesout == 5) {
373 trans->type = SPI_OPCODE_TYPE_READ_WITH_ADDRESS;
378 static int spi_setup_opcode(struct spi_trans *trans)
381 uint8_t opmenu[ctlr.menubytes];
383 trans->opcode = trans->out[0];
384 spi_use_out(trans, 1);
385 if (!ctlr.ichspi_lock) {
386 /* The lock is off, so just use index 0. */
387 ich_writeb(trans->opcode, ctlr.opmenu);
388 optypes = ich_readw(ctlr.optype);
389 optypes = (optypes & 0xfffc) | (trans->type & 0x3);
390 ich_writew(optypes, ctlr.optype);
393 /* The lock is on. See if what we need is on the menu. */
395 uint16_t opcode_index;
397 /* Write Enable is handled as atomic prefix */
398 if (trans->opcode == SPI_OPCODE_WREN)
401 read_reg(ctlr.opmenu, opmenu, sizeof(opmenu));
402 for (opcode_index = 0; opcode_index < ctlr.menubytes;
404 if (opmenu[opcode_index] == trans->opcode)
408 if (opcode_index == ctlr.menubytes) {
409 printf("ICH SPI: Opcode %x not found\n",
414 optypes = ich_readw(ctlr.optype);
415 optype = (optypes >> (opcode_index * 2)) & 0x3;
416 if (trans->type == SPI_OPCODE_TYPE_WRITE_NO_ADDRESS &&
417 optype == SPI_OPCODE_TYPE_WRITE_WITH_ADDRESS &&
418 trans->bytesout >= 3) {
419 /* We guessed wrong earlier. Fix it up. */
420 trans->type = optype;
422 if (optype != trans->type) {
423 printf("ICH SPI: Transaction doesn't fit type %d\n",
431 static int spi_setup_offset(struct spi_trans *trans)
433 /* Separate the SPI address and data. */
434 switch (trans->type) {
435 case SPI_OPCODE_TYPE_READ_NO_ADDRESS:
436 case SPI_OPCODE_TYPE_WRITE_NO_ADDRESS:
438 case SPI_OPCODE_TYPE_READ_WITH_ADDRESS:
439 case SPI_OPCODE_TYPE_WRITE_WITH_ADDRESS:
440 trans->offset = ((uint32_t)trans->out[0] << 16) |
441 ((uint32_t)trans->out[1] << 8) |
442 ((uint32_t)trans->out[2] << 0);
443 spi_use_out(trans, 3);
446 printf("Unrecognized SPI transaction type %#x\n", trans->type);
452 * Wait for up to 6s til status register bit(s) turn 1 (in case wait_til_set
453 * below is True) or 0. In case the wait was for the bit(s) to set - write
454 * those bits back, which would cause resetting them.
456 * Return the last read status value on success or -1 on failure.
458 static int ich_status_poll(u16 bitmask, int wait_til_set)
460 int timeout = 600000; /* This will result in 6s */
464 status = ich_readw(ctlr.status);
465 if (wait_til_set ^ ((status & bitmask) == 0)) {
467 ich_writew((status & bitmask), ctlr.status);
473 printf("ICH SPI: SCIP timeout, read %x, expected %x\n",
479 int spi_xfer(struct spi_slave *slave, const void *dout,
480 unsigned int bitsout, void *din, unsigned int bitsin)
482 int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
483 void *din, unsigned long flags)
485 struct ich_spi_slave *ich = to_ich_spi(slave);
487 int16_t opcode_index;
490 int bytes = bitlen / 8;
491 struct spi_trans *trans = &ich->trans;
492 unsigned type = flags & (SPI_XFER_BEGIN | SPI_XFER_END);
494 /* Align read transactions to 64-byte boundaries */
495 char buff[ctlr.databytes];
497 /* Ee don't support writing partial bytes. */
499 debug("ICH SPI: Accessing partial bytes not supported\n");
503 /* An empty end transaction can be ignored */
504 if (type == SPI_XFER_END && !dout && !din)
507 if (type & SPI_XFER_BEGIN)
508 memset(trans, '\0', sizeof(*trans));
510 /* Dp we need to come back later to finish it? */
511 if (dout && type == SPI_XFER_BEGIN) {
512 if (bytes > ICH_MAX_CMD_LEN) {
513 debug("ICH SPI: Command length limit exceeded\n");
516 memcpy(trans->cmd, dout, bytes);
517 trans->cmd_len = bytes;
518 debug("ICH SPI: Saved %d bytes\n", bytes);
523 * We process a 'middle' spi_xfer() call, which has no
524 * SPI_XFER_BEGIN/END, as an independent transaction as if it had
525 * an end. We therefore repeat the command. This is because ICH
526 * seems to have no support for this, or because interest (in digging
527 * out the details and creating a special case in the code) is low.
529 if (trans->cmd_len) {
530 trans->out = trans->cmd;
531 trans->bytesout = trans->cmd_len;
533 debug("ICH SPI: Using %d bytes\n", trans->cmd_len);
536 trans->bytesout = dout ? bytes : 0;
540 trans->bytesin = din ? bytes : 0;
542 /* There has to always at least be an opcode. */
543 if (!trans->bytesout) {
544 debug("ICH SPI: No opcode for transfer\n");
548 if (ich_status_poll(SPIS_SCIP, 0) == -1)
551 ich_writew(SPIS_CDS | SPIS_FCERR, ctlr.status);
553 spi_setup_type(trans, using_cmd ? bytes : 0);
554 opcode_index = spi_setup_opcode(trans);
555 if (opcode_index < 0)
557 with_address = spi_setup_offset(trans);
558 if (with_address < 0)
561 if (trans->opcode == SPI_OPCODE_WREN) {
563 * Treat Write Enable as Atomic Pre-Op if possible
564 * in order to prevent the Management Engine from
565 * issuing a transaction between WREN and DATA.
567 if (!ctlr.ichspi_lock)
568 ich_writew(trans->opcode, ctlr.preop);
572 if (ctlr.speed && ctlr.max_speed >= 33000000) {
575 byte = ich_readb(ctlr.speed);
576 if (ich->speed >= 33000000)
577 byte |= SSFC_SCF_33MHZ;
579 byte &= ~SSFC_SCF_33MHZ;
580 ich_writeb(byte, ctlr.speed);
583 /* See if we have used up the command data */
584 if (using_cmd && dout && bytes) {
586 trans->bytesout = bytes;
587 debug("ICH SPI: Moving to data, %d bytes\n", bytes);
590 /* Preset control fields */
591 control = ich_readw(ctlr.control);
592 control &= ~SSFC_RESERVED;
593 control = SPIC_SCGO | ((opcode_index & 0x07) << 4);
595 /* Issue atomic preop cycle if needed */
596 if (ich_readw(ctlr.preop))
599 if (!trans->bytesout && !trans->bytesin) {
600 /* SPI addresses are 24 bit only */
602 ich_writel(trans->offset & 0x00FFFFFF, ctlr.addr);
605 * This is a 'no data' command (like Write Enable), its
606 * bitesout size was 1, decremented to zero while executing
607 * spi_setup_opcode() above. Tell the chip to send the
610 ich_writew(control, ctlr.control);
612 /* wait for the result */
613 status = ich_status_poll(SPIS_CDS | SPIS_FCERR, 1);
617 if (status & SPIS_FCERR) {
618 debug("ICH SPI: Command transaction error\n");
626 * Check if this is a write command atempting to transfer more bytes
627 * than the controller can handle. Iterations for writes are not
628 * supported here because each SPI write command needs to be preceded
629 * and followed by other SPI commands, and this sequence is controlled
630 * by the SPI chip driver.
632 if (trans->bytesout > ctlr.databytes) {
633 debug("ICH SPI: Too much to write. This should be prevented by the driver's max_write_size?\n");
638 * Read or write up to databytes bytes at a time until everything has
641 while (trans->bytesout || trans->bytesin) {
642 uint32_t data_length;
643 uint32_t aligned_offset;
646 aligned_offset = trans->offset & ~(ctlr.databytes - 1);
647 diff = trans->offset - aligned_offset;
649 /* SPI addresses are 24 bit only */
650 ich_writel(aligned_offset & 0x00FFFFFF, ctlr.addr);
653 data_length = min(trans->bytesout, ctlr.databytes);
655 data_length = min(trans->bytesin, ctlr.databytes);
657 /* Program data into FDATA0 to N */
658 if (trans->bytesout) {
659 write_reg(trans->out, ctlr.data, data_length);
660 spi_use_out(trans, data_length);
662 trans->offset += data_length;
665 /* Add proper control fields' values */
666 control &= ~((ctlr.databytes - 1) << 8);
668 control |= (data_length - 1) << 8;
671 ich_writew(control, ctlr.control);
673 /* Wait for Cycle Done Status or Flash Cycle Error. */
674 status = ich_status_poll(SPIS_CDS | SPIS_FCERR, 1);
678 if (status & SPIS_FCERR) {
679 debug("ICH SPI: Data transaction error\n");
683 if (trans->bytesin) {
686 read_reg(ctlr.data, buff, ctlr.databytes);
687 memcpy(trans->in, buff + diff, data_length);
689 read_reg(ctlr.data, trans->in, data_length);
691 spi_use_in(trans, data_length);
693 trans->offset += data_length;
697 /* Clear atomic preop now that xfer is done */
698 ich_writew(0, ctlr.preop);
705 * This uses the SPI controller from the Intel Cougar Point and Panther Point
706 * PCH to write-protect portions of the SPI flash until reboot. The changes
707 * don't actually take effect until the HSFS[FLOCKDN] bit is set, but that's
710 int spi_write_protect_region(uint32_t lower_limit, uint32_t length, int hint)
713 uint32_t upper_limit;
716 printf("%s: operation not supported on this chipset\n",
722 lower_limit > (0xFFFFFFFFUL - length) + 1 ||
723 hint < 0 || hint > 4) {
724 printf("%s(0x%x, 0x%x, %d): invalid args\n", __func__,
725 lower_limit, length, hint);
729 upper_limit = lower_limit + length - 1;
732 * Determine bits to write, as follows:
733 * 31 Write-protection enable (includes erase operation)
735 * 28:16 Upper Limit (FLA address bits 24:12, with 11:0 == 0xfff)
736 * 15 Read-protection enable
738 * 12:0 Lower Limit (FLA address bits 24:12, with 11:0 == 0x000)
740 tmplong = 0x80000000 |
741 ((upper_limit & 0x01fff000) << 4) |
742 ((lower_limit & 0x01fff000) >> 12);
744 printf("%s: writing 0x%08x to %p\n", __func__, tmplong,
746 ctlr.pr[hint] = tmplong;