Beispiel #1
0
static int cr50_i2c_probe(struct tpm_chip *chip, uint32_t *did_vid)
{
	int retries;

	/*
	 * 150 ms should be enough to synchronize with the TPM even under the
	 * worst nested reset request conditions. In vast majority of cases
	 * there would be no wait at all.
	 */
	printk(BIOS_INFO, "Probing TPM I2C: ");

	for (retries = 15; retries > 0; retries--) {
		int rc;

		rc = cr50_i2c_read(chip, TPM_DID_VID(0), (uint8_t *)did_vid, 4);

		/* Exit once DID and VID verified */
		if (!rc && (*did_vid == CR50_DID_VID)) {
			printk(BIOS_INFO, "done! DID_VID 0x%08x\n", *did_vid);
			return 0;
		}

		/* TPM might be resetting, let's retry in a bit. */
		mdelay(10);
		printk(BIOS_INFO, ".");
	}

	/*
	 * I2C reads failed, or the DID and VID didn't match
	 */
	printk(BIOS_ERR, "DID_VID 0x%08x not recognized\n", *did_vid);
	return -1;
}
Beispiel #2
0
static int tpm_tis_i2c_init(struct udevice *dev)
{
	struct tpm_chip *chip = dev_get_priv(dev);
	u32 vendor;
	u32 expected_did_vid;
	int rc;

	chip->is_open = 1;

	/* Default timeouts - these could move to the device tree */
	chip->timeout_a = TIS_SHORT_TIMEOUT_MS;
	chip->timeout_b = TIS_LONG_TIMEOUT_MS;
	chip->timeout_c = TIS_SHORT_TIMEOUT_MS;
	chip->timeout_d = TIS_SHORT_TIMEOUT_MS;

	rc = tpm_tis_i2c_request_locality(dev, 0);
	if (rc < 0)
		return rc;

	/* Read four bytes from DID_VID register */
	if (tpm_tis_i2c_read(dev, TPM_DID_VID(0), (uchar *)&vendor, 4) < 0) {
		tpm_tis_i2c_release_locality(dev, 0, 1);
		return -EIO;
	}

	if (chip->chip_type == SLB9635) {
		vendor = be32_to_cpu(vendor);
		expected_did_vid = TPM_TIS_I2C_DID_VID_9635;
	} else {
		/* device id and byte order has changed for newer i2c tpms */
		expected_did_vid = TPM_TIS_I2C_DID_VID_9645;
	}

	if (chip->chip_type != UNKNOWN && vendor != expected_did_vid) {
		pr_err("Vendor id did not match! ID was %08x\n", vendor);
		return -ENODEV;
	}

	chip->vend_dev = vendor;
	debug("1.2 TPM (chip type %s device-id 0x%X)\n",
	      chip_name[chip->chip_type], vendor >> 16);

	/*
	 * A timeout query to TPM can be placed here.
	 * Standard timeout values are used so far
	 */

	return 0;
}
Beispiel #3
0
static int __devinit tpm_tis_i2c_init(struct device *dev)
{
	u32 vendor;
	int rc = 0;
	struct tpm_chip *chip;

	chip = tpm_register_hardware(dev, &tpm_tis_i2c);
	if (!chip) {
		rc = -ENODEV;
		goto out_err;
	}

	/* Disable interrupts */
	chip->vendor.irq = 0;

	/* Default timeouts */
	chip->vendor.timeout_a = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
	chip->vendor.timeout_b = msecs_to_jiffies(TIS_LONG_TIMEOUT);
	chip->vendor.timeout_c = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
	chip->vendor.timeout_d = msecs_to_jiffies(TIS_SHORT_TIMEOUT);

	if (request_locality(chip, 0) != 0) {
		rc = -ENODEV;
		goto out_vendor;
	}

	/* read four bytes from DID_VID register */
	if (iic_tpm_read(TPM_DID_VID(0), (u8 *)&vendor, 4) < 0) {
		rc = -EIO;
		goto out_release;
	}

	/* create DID_VID register value, after swapping to little-endian */
	vendor = be32_to_cpu((__be32) vendor);

	if (vendor != TPM_TIS_I2C_DID_VID) {
		rc = -ENODEV;
		goto out_release;
	}

	dev_info(dev, "1.2 TPM (device-id 0x%X)\n", vendor >> 16);

	INIT_LIST_HEAD(&chip->vendor.list);
	tpm_dev.chip = chip;

	tpm_get_timeouts(chip);
	tpm_do_selftest(chip);

	return 0;

out_release:
	release_locality(chip, chip->vendor.locality, 1);

out_vendor:
	/* close file handles */
	tpm_dev_vendor_release(chip);

	/* remove hardware */
	tpm_remove_hardware(chip->dev);

	/* reset these pointers, otherwise we oops */
	chip->dev->release = NULL;
	chip->release = NULL;
	tpm_dev.client = NULL;
	dev_set_drvdata(chip->dev, chip);
out_err:
	return rc;
}
Beispiel #4
0
struct tpm_chip* init_tpm_tis(unsigned long baseaddr, int localities, unsigned int irq)
{
   int i;
   unsigned long addr;
   struct tpm_chip* tpm = NULL;
   uint32_t didvid;
   uint32_t intfcaps;
   uint32_t intmask;

   printk("============= Init TPM TIS Driver ==============\n");

   /*Sanity check the localities input */
   if(localities & ~TPM_TIS_EN_LOCLALL) {
      printk("init_tpm_tis() Invalid locality specification! %X\n", localities);
      goto abort_egress;
   }

   printk("IOMEM Machine Base Address: %lX\n", baseaddr);

   /* Create the tpm data structure */
   tpm = malloc(sizeof(struct tpm_chip));
   __init_tpm_chip(tpm);

   /* Set the enabled localities - if 0 we leave default as all enabled */
   if(localities != 0) {
      tpm->enabled_localities = localities;
   }
   printk("Enabled Localities: ");
   for(i = 0; i < 5; ++i) {
      if(locality_enabled(tpm, i)) {
	 printk("%d ", i);
      }
   }
   printk("\n");

   /* Set the base machine address */
   tpm->baseaddr = baseaddr;

   /* Set default timeouts */
   tpm->timeout_a = MILLISECS(TIS_SHORT_TIMEOUT);
   tpm->timeout_b = MILLISECS(TIS_LONG_TIMEOUT);
   tpm->timeout_c = MILLISECS(TIS_SHORT_TIMEOUT);
   tpm->timeout_d = MILLISECS(TIS_SHORT_TIMEOUT);

   /*Map the mmio pages */
   addr = tpm->baseaddr;
   for(i = 0; i < 5; ++i) {
      if(locality_enabled(tpm, i)) {
	 /* Map the page in now */
	 if((tpm->pages[i] = ioremap_nocache(addr, PAGE_SIZE)) == NULL) {
	    printk("Unable to map iomem page a address %p\n", addr);
	    goto abort_egress;
	 }

	 /* Set default locality to the first enabled one */
	 if (tpm->locality < 0) {
	    if(tpm_tis_request_locality(tpm, i) < 0) {
	       printk("Unable to request locality %d??\n", i);
	       goto abort_egress;
	    }
	 }
      }
      addr += PAGE_SIZE;
   }


   /* Get the vendor and device ids */
   didvid = ioread32(TPM_DID_VID(tpm, tpm->locality));
   tpm->did = didvid >> 16;
   tpm->vid = didvid & 0xFFFF;


   /* Get the revision id */
   tpm->rid = ioread8(TPM_RID(tpm, tpm->locality));

   printk("1.2 TPM (device-id=0x%X vendor-id = %X rev-id = %X)\n", tpm->did, tpm->vid, tpm->rid);

   intfcaps = ioread32(TPM_INTF_CAPS(tpm, tpm->locality));
   printk("TPM interface capabilities (0x%x):\n", intfcaps);
   if (intfcaps & TPM_INTF_BURST_COUNT_STATIC)
      printk("\tBurst Count Static\n");
   if (intfcaps & TPM_INTF_CMD_READY_INT)
      printk("\tCommand Ready Int Support\n");
   if (intfcaps & TPM_INTF_INT_EDGE_FALLING)
      printk("\tInterrupt Edge Falling\n");
   if (intfcaps & TPM_INTF_INT_EDGE_RISING)
      printk("\tInterrupt Edge Rising\n");
   if (intfcaps & TPM_INTF_INT_LEVEL_LOW)
      printk("\tInterrupt Level Low\n");
   if (intfcaps & TPM_INTF_INT_LEVEL_HIGH)
      printk("\tInterrupt Level High\n");
   if (intfcaps & TPM_INTF_LOCALITY_CHANGE_INT)
      printk("\tLocality Change Int Support\n");
   if (intfcaps & TPM_INTF_STS_VALID_INT)
      printk("\tSts Valid Int Support\n");
   if (intfcaps & TPM_INTF_DATA_AVAIL_INT)
      printk("\tData Avail Int Support\n");

   /*Interupt setup */
   intmask = ioread32(TPM_INT_ENABLE(tpm, tpm->locality));

   intmask |= TPM_INTF_CMD_READY_INT
      | TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_DATA_AVAIL_INT
      | TPM_INTF_STS_VALID_INT;

   iowrite32(TPM_INT_ENABLE(tpm, tpm->locality), intmask);

   /*If interupts are enabled, handle it */
   if(irq) {
      if(irq != TPM_PROBE_IRQ) {
	 tpm->irq = irq;
      } else {
	 /*FIXME add irq probing feature later */
	 printk("IRQ probing not implemented\n");
      }
   }

   if(tpm->irq) {
      iowrite8(TPM_INT_VECTOR(tpm, tpm->locality), tpm->irq);

      if(bind_pirq(tpm->irq, 1, tpm_tis_irq_handler, tpm) != 0) {
	 printk("Unabled to request irq: %u for use\n", tpm->irq);
	 printk("Will use polling mode\n");
	 tpm->irq = 0;
      } else {
	 /* Clear all existing */
	 iowrite32(TPM_INT_STATUS(tpm, tpm->locality), ioread32(TPM_INT_STATUS(tpm, tpm->locality)));

	 /* Turn on interrupts */
	 iowrite32(TPM_INT_ENABLE(tpm, tpm->locality), intmask | TPM_GLOBAL_INT_ENABLE);
      }
   }

   if(tpm_get_timeouts(tpm)) {
      printk("Could not get TPM timeouts and durations\n");
      goto abort_egress;
   }
   tpm_continue_selftest(tpm);


   return tpm;
abort_egress:
   if(tpm != NULL) {
      shutdown_tpm_tis(tpm);
   }
   return NULL;
}