| Message ID | 1462388788-2410-4-git-send-email-christophe-h.ricard@st.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Wed, May 04, 2016 at 09:06:24PM +0200, Christophe Ricard wrote: > This splits tpm_tis in a high-level protocol part and a low-level interface > for the actual TPM communication. The low-level interface can then be > implemented by additional drivers to provide access to TPMs using other > mechanisms, for example native I2C or SPI transfers, while still reusing > the same TIS protocol implementation. > > Though the ioread/iowrite calls cannot fail, other implementations of this > interface might want to return error codes if their communication fails. > > This follows the usual pattern of negative values representing errors and > zero representing success. Positive values are not used (yet). > > Errors are passed back to the caller if possible. If the interface of a > function does not allow that, it tries to do the most sensible thing it > can, but this might also mean ignoring the error in this instance. > > Signed-off-by: Alexander Steffen <Alexander.Steffen@infineon.com> > Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com> > --- > drivers/char/tpm/tpm_tis.c | 317 +++++++++++++++++++++++++++------------- > drivers/char/tpm/tpm_tis_core.h | 48 ++++++ > 2 files changed, 264 insertions(+), 101 deletions(-) > > diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c > index cd5bb63..e88e321 100644 > --- a/drivers/char/tpm/tpm_tis.c > +++ b/drivers/char/tpm/tpm_tis.c > @@ -134,11 +134,16 @@ static inline int is_itpm(struct acpi_device *dev) > static int wait_startup(struct tpm_chip *chip, int l) > { > struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); > - struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(priv); > unsigned long stop = jiffies + chip->timeout_a; > + int rc; > + u8 access; > + > do { > - if (ioread8(phy->iobase + TPM_ACCESS(l)) & > - TPM_ACCESS_VALID) > + rc = tpm_read8(priv, TPM_ACCESS(l), &access); > + if (rc < 0) > + return rc; > + > + if (access & TPM_ACCESS_VALID) > return 0; > msleep(TPM_TIMEOUT); > } while (time_before(jiffies, stop)); > @@ -148,10 +153,14 @@ static int wait_startup(struct tpm_chip *chip, int l) > static int check_locality(struct tpm_chip *chip, int l) > { > struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); > - struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(priv); > + int rc; > + u8 access; > + > + rc = tpm_read8(priv, TPM_ACCESS(l), &access); > + if (rc < 0) > + return rc; > > - if ((ioread8(phy->iobase + TPM_ACCESS(l)) & > - (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) == > + if ((access & (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) == > (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) > return priv->locality = l; > > @@ -161,27 +170,32 @@ static int check_locality(struct tpm_chip *chip, int l) > static void release_locality(struct tpm_chip *chip, int l, int force) > { > struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); > - struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(priv); > + int rc; > + u8 access; > + > + rc = tpm_read8(priv, TPM_ACCESS(l), &access); > + if (rc < 0) > + return; > > - if (force || (ioread8(phy->iobase + TPM_ACCESS(l)) & > + if (force || (access & > (TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID)) == > (TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID)) > - iowrite8(TPM_ACCESS_ACTIVE_LOCALITY, > - phy->iobase + TPM_ACCESS(l)); > + tpm_write8(priv, TPM_ACCESS(l), TPM_ACCESS_ACTIVE_LOCALITY); > + > } > > static int request_locality(struct tpm_chip *chip, int l) > { > struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); > - struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(priv); > unsigned long stop, timeout; > long rc; > > if (check_locality(chip, l) >= 0) > return l; > > - iowrite8(TPM_ACCESS_REQUEST_USE, > - phy->iobase + TPM_ACCESS(l)); > + rc = tpm_write8(priv, TPM_ACCESS(l), TPM_ACCESS_REQUEST_USE); > + if (rc < 0) > + return rc; > > stop = jiffies + chip->timeout_a; > > @@ -215,38 +229,45 @@ again: > static u8 tpm_tis_status(struct tpm_chip *chip) > { > struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); > - struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(priv); > + int rc; > + u8 status; > + > + rc = tpm_read8(priv, TPM_STS(priv->locality), &status); > + if (rc < 0) > + return 0; > > - return ioread8(phy->iobase + > - TPM_STS(priv->locality)); > + return status; > } > > static void tpm_tis_ready(struct tpm_chip *chip) > { > struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); > - struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(priv); > > /* this causes the current command to be aborted */ > - iowrite8(TPM_STS_COMMAND_READY, > - phy->iobase + TPM_STS(priv->locality)); > + tpm_write8(priv, TPM_STS(priv->locality), TPM_STS_COMMAND_READY); > } > > static int get_burstcount(struct tpm_chip *chip) > { > struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); > - struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(priv); > unsigned long stop; > - int burstcnt; > + int burstcnt, rc; > + u8 value; > > /* wait for burstcount */ > /* which timeout value, spec has 2 answers (c & d) */ > stop = jiffies + chip->timeout_d; > do { > - burstcnt = ioread8(phy->iobase + > - TPM_STS(priv->locality) + 1); > - burstcnt += ioread8(phy->iobase + > - TPM_STS(priv->locality) + > - 2) << 8; > + rc = tpm_read8(priv, TPM_STS(priv->locality) + 1, &value); > + if (rc < 0) > + return rc; > + > + burstcnt = value; > + rc = tpm_read8(priv, TPM_STS(priv->locality) + 2, &value); > + if (rc < 0) > + return rc; > + > + burstcnt += value << 8; > if (burstcnt) > return burstcnt; > msleep(TPM_TIMEOUT); > @@ -257,18 +278,20 @@ static int get_burstcount(struct tpm_chip *chip) > static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count) > { > struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); > - struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(priv); > - int size = 0, burstcnt; > + int size = 0, burstcnt, rc; > + > while (size < count && > wait_for_tpm_stat(chip, > TPM_STS_DATA_AVAIL | TPM_STS_VALID, > chip->timeout_c, > - &priv->read_queue, true) > - == 0) { > - burstcnt = get_burstcount(chip); > - for (; burstcnt > 0 && size < count; burstcnt--) > - buf[size++] = ioread8(phy->iobase + > - TPM_DATA_FIFO(priv->locality)); > + &priv->read_queue, true) == 0) { > + burstcnt = min_t(int, get_burstcount(chip), count - size); > + rc = tpm_read_bytes(priv, TPM_DATA_FIFO(priv->locality), > + burstcnt, buf + size); > + if (rc < 0) > + return rc; > + > + size += burstcnt; > } > return size; > } > @@ -332,7 +355,6 @@ MODULE_PARM_DESC(itpm, "Force iTPM workarounds (found on some Lenovo laptops)"); > static int tpm_tis_send_data(struct tpm_chip *chip, u8 *buf, size_t len) > { > struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); > - struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(priv); > int rc, status, burstcnt; > size_t count = 0; > > @@ -351,12 +373,13 @@ static int tpm_tis_send_data(struct tpm_chip *chip, u8 *buf, size_t len) > } > > while (count < len - 1) { > - burstcnt = get_burstcount(chip); > - for (; burstcnt > 0 && count < len - 1; burstcnt--) { > - iowrite8(buf[count], phy->iobase + > - TPM_DATA_FIFO(priv->locality)); > - count++; > - } > + burstcnt = min_t(int, get_burstcount(chip), len - count - 1); > + rc = tpm_write_bytes(priv, TPM_DATA_FIFO(priv->locality), > + burstcnt, buf + count); > + if (rc < 0) > + goto out_err; > + > + count += burstcnt; > > wait_for_tpm_stat(chip, TPM_STS_VALID, chip->timeout_c, > &priv->int_queue, false); > @@ -368,8 +391,10 @@ static int tpm_tis_send_data(struct tpm_chip *chip, u8 *buf, size_t len) > } > > /* write last byte */ > - iowrite8(buf[count], > - phy->iobase + TPM_DATA_FIFO(priv->locality)); > + rc = tpm_write8(priv, TPM_DATA_FIFO(priv->locality), buf[count]); > + if (rc < 0) > + goto out_err; > + > wait_for_tpm_stat(chip, TPM_STS_VALID, chip->timeout_c, > &priv->int_queue, false); > status = tpm_tis_status(chip); > @@ -389,15 +414,16 @@ out_err: > static void disable_interrupts(struct tpm_chip *chip) > { > struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); > - struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(priv); > u32 intmask; > + int rc; > + > + rc = tpm_read32(priv, TPM_INT_ENABLE(priv->locality), &intmask); > + if (rc < 0) > + intmask = 0; > > - intmask = > - ioread32(phy->iobase + > - TPM_INT_ENABLE(priv->locality)); > intmask &= ~TPM_GLOBAL_INT_ENABLE; > - iowrite32(intmask, > - phy->iobase + TPM_INT_ENABLE(priv->locality)); > + tpm_write32(priv, TPM_INT_ENABLE(priv->locality), intmask); > + > devm_free_irq(chip->dev.parent, priv->irq, chip); > priv->irq = 0; > chip->flags &= ~TPM_CHIP_FLAG_IRQ; > @@ -411,7 +437,6 @@ static void disable_interrupts(struct tpm_chip *chip) > static int tpm_tis_send_main(struct tpm_chip *chip, u8 *buf, size_t len) > { > struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); > - struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(priv); > int rc; > u32 ordinal; > unsigned long dur; > @@ -421,8 +446,9 @@ static int tpm_tis_send_main(struct tpm_chip *chip, u8 *buf, size_t len) > return rc; > > /* go and do it */ > - iowrite8(TPM_STS_GO, > - phy->iobase + TPM_STS(priv->locality)); > + rc = tpm_write8(priv, TPM_STS(priv->locality), TPM_STS_GO); > + if (rc < 0) > + return rc; > > if (chip->flags & TPM_CHIP_FLAG_IRQ) { > ordinal = be32_to_cpu(*((__be32 *) (buf + 6))); > @@ -484,11 +510,12 @@ static bool tpm_tis_update_timeouts(struct tpm_chip *chip, > unsigned long *timeout_cap) > { > struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); > - struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(priv); > - int i; > + int i, rc; > u32 did_vid; > > - did_vid = ioread32(phy->iobase + TPM_DID_VID(0)); > + rc = tpm_read32(priv, TPM_DID_VID(0), &did_vid); > + if (rc < 0) > + return rc; > > for (i = 0; i != ARRAY_SIZE(vendor_timeout_overrides); i++) { > if (vendor_timeout_overrides[i].did_vid != did_vid) > @@ -509,7 +536,6 @@ static bool tpm_tis_update_timeouts(struct tpm_chip *chip, > static int probe_itpm(struct tpm_chip *chip) > { > struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); > - struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(priv); > int rc = 0; > u8 cmd_getticks[] = { > 0x00, 0xc1, 0x00, 0x00, 0x00, 0x0a, > @@ -517,7 +543,11 @@ static int probe_itpm(struct tpm_chip *chip) > }; > size_t len = sizeof(cmd_getticks); > bool rem_itpm = itpm; > - u16 vendor = ioread16(phy->iobase + TPM_DID_VID(0)); > + u16 vendor; > + > + rc = tpm_read16(priv, TPM_DID_VID(0), &vendor); > + if (rc < 0) > + return rc; > > /* probe only iTPMS */ > if (vendor != TPM_VID_INTEL) > @@ -575,16 +605,68 @@ static const struct tpm_class_ops tpm_tis = { > .req_canceled = tpm_tis_req_canceled, > }; > > +static int tpm_tcg_read_bytes(struct tpm_tis_data *data, u32 addr, u16 len, > + u8 *result) > +{ > + struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data); > + > + while (len--) > + *result++ = ioread8(phy->iobase + addr); > + return 0; > +} > + > +static int tpm_tcg_write_bytes(struct tpm_tis_data *data, u32 addr, u16 len, > + u8 *value) > +{ > + struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data); > + > + while (len--) > + iowrite8(*value++, phy->iobase + addr); > + return 0; > +} > + > +static int tpm_tcg_read16(struct tpm_tis_data *data, u32 addr, u16 *result) > +{ > + struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data); > + > + *result = ioread16(phy->iobase + addr); > + return 0; > +} > + > +static int tpm_tcg_read32(struct tpm_tis_data *data, u32 addr, u32 *result) > +{ > + struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data); > + > + *result = ioread32(phy->iobase + addr); > + return 0; > +} > + > +static int tpm_tcg_write32(struct tpm_tis_data *data, u32 addr, u32 value) > +{ > + struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data); > + > + iowrite32(value, phy->iobase + addr); > + return 0; > +} > + > +static const struct tpm_tis_phy_ops tpm_tcg = { > + .read_bytes = tpm_tcg_read_bytes, > + .write_bytes = tpm_tcg_write_bytes, > + .read16 = tpm_tcg_read16, > + .read32 = tpm_tcg_read32, > + .write32 = tpm_tcg_write32, > +}; > + > static irqreturn_t tis_int_handler(int dummy, void *dev_id) > { > struct tpm_chip *chip = dev_id; > struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); > - struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(priv); > u32 interrupt; > - int i; > + int i, rc; > > - interrupt = ioread32(phy->iobase + > - TPM_INT_STATUS(priv->locality)); > + rc = tpm_read32(priv, TPM_INT_STATUS(priv->locality), &interrupt); > + if (rc < 0) > + return IRQ_NONE; > > if (interrupt == 0) > return IRQ_NONE; > @@ -602,10 +684,11 @@ static irqreturn_t tis_int_handler(int dummy, void *dev_id) > wake_up_interruptible(&priv->int_queue); > > /* Clear interrupts handled with TPM_EOI */ > - iowrite32(interrupt, > - phy->iobase + > - TPM_INT_STATUS(priv->locality)); > - ioread32(phy->iobase + TPM_INT_STATUS(priv->locality)); > + rc = tpm_write32(priv, TPM_INT_STATUS(priv->locality), interrupt); > + if (rc < 0) > + return IRQ_NONE; > + > + tpm_read32(priv, TPM_INT_STATUS(priv->locality), &interrupt); > return IRQ_HANDLED; > } > > @@ -617,8 +700,9 @@ static int tpm_tis_probe_irq_single(struct tpm_chip *chip, u32 intmask, > int flags, int irq) > { > struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); > - struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(priv); > u8 original_int_vec; > + int rc; > + u32 int_status; > > if (devm_request_irq(chip->dev.parent, irq, tis_int_handler, flags, > dev_name(&chip->dev), chip) != 0) { > @@ -628,19 +712,28 @@ static int tpm_tis_probe_irq_single(struct tpm_chip *chip, u32 intmask, > } > priv->irq = irq; > > - original_int_vec = ioread8(phy->iobase + > - TPM_INT_VECTOR(priv->locality)); > - iowrite8(irq, > - phy->iobase + TPM_INT_VECTOR(priv->locality)); > + rc = tpm_read8(priv, TPM_INT_VECTOR(priv->locality), &original_int_vec); > + if (rc < 0) > + return rc; > + > + rc = tpm_write8(priv, TPM_INT_VECTOR(priv->locality), irq); > + if (rc < 0) > + return rc; > + > + rc = tpm_read32(priv, TPM_INT_STATUS(priv->locality), &int_status); > + if (rc < 0) > + return rc; > > /* Clear all existing */ > - iowrite32(ioread32(phy->iobase + > - TPM_INT_STATUS(priv->locality)), > - phy->iobase + TPM_INT_STATUS(priv->locality)); > + rc = tpm_write32(priv, TPM_INT_STATUS(priv->locality), int_status); > + if (rc < 0) > + return rc; > > /* Turn on */ > - iowrite32(intmask | TPM_GLOBAL_INT_ENABLE, > - phy->iobase + TPM_INT_ENABLE(priv->locality)); > + rc = tpm_write32(priv, TPM_INT_ENABLE(priv->locality), > + intmask | TPM_GLOBAL_INT_ENABLE); > + if (rc < 0) > + return rc; > > priv->irq_tested = false; > > @@ -656,8 +749,11 @@ static int tpm_tis_probe_irq_single(struct tpm_chip *chip, u32 intmask, > * will call disable_irq which undoes all of the above. > */ > if (!(chip->flags & TPM_CHIP_FLAG_IRQ)) { > - iowrite8(original_int_vec, > - phy->iobase + TPM_INT_VECTOR(priv->locality)); > + rc = tpm_write8(priv, TPM_INT_VECTOR(priv->locality), > + original_int_vec); > + if (rc < 0) > + return rc; > + > return 1; > } > > @@ -671,12 +767,12 @@ static int tpm_tis_probe_irq_single(struct tpm_chip *chip, u32 intmask, > static void tpm_tis_probe_irq(struct tpm_chip *chip, u32 intmask) > { > struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); > - struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(priv); > u8 original_int_vec; > - int i; > + int i, rc; > > - original_int_vec = ioread8(phy->iobase + > - TPM_INT_VECTOR(priv->locality)); > + rc = tpm_read8(priv, TPM_INT_VECTOR(priv->locality), &original_int_vec); > + if (rc < 0) > + return; > > if (!original_int_vec) { > if (IS_ENABLED(CONFIG_X86)) > @@ -696,10 +792,15 @@ MODULE_PARM_DESC(interrupts, "Enable interrupts"); > static void tpm_tis_remove(struct tpm_chip *chip) > { > struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); > - struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(priv); > - void __iomem *reg = phy->iobase + TPM_INT_ENABLE(priv->locality); > + u32 reg = TPM_INT_ENABLE(priv->locality); > + u32 interrupt; > + int rc; > + > + rc = tpm_read32(priv, reg, &interrupt); > + if (rc < 0) > + interrupt = 0; > > - iowrite32(~TPM_GLOBAL_INT_ENABLE & ioread32(reg), reg); > + tpm_write32(priv, reg, ~TPM_GLOBAL_INT_ENABLE & interrupt); > release_locality(chip, priv->locality, 1); > } > > @@ -707,6 +808,7 @@ static int tpm_tis_init(struct device *dev, struct tpm_info *tpm_info, > acpi_handle acpi_dev_handle) > { > u32 vendor, intfcaps, intmask; > + u8 rid; > int rc, probe; > struct tpm_chip *chip; > struct tpm_tis_tcg_phy *phy; > @@ -727,6 +829,8 @@ static int tpm_tis_init(struct device *dev, struct tpm_info *tpm_info, > if (IS_ERR(phy->iobase)) > return PTR_ERR(phy->iobase); > > + phy->priv.phy_ops = &tpm_tcg; > + > /* Maximum timeouts */ > chip->timeout_a = TIS_TIMEOUT_A_MAX; > chip->timeout_b = TIS_TIMEOUT_B_MAX; > @@ -741,13 +845,15 @@ static int tpm_tis_init(struct device *dev, struct tpm_info *tpm_info, > } > > /* Take control of the TPM's interrupt hardware and shut it off */ > - intmask = ioread32(phy->iobase + > - TPM_INT_ENABLE(phy->priv.locality)); > + rc = tpm_read32(&phy->priv, TPM_INT_ENABLE(phy->priv.locality), > + &intmask); > + if (rc < 0) > + goto out_err; > + > intmask |= TPM_INTF_CMD_READY_INT | TPM_INTF_LOCALITY_CHANGE_INT | > TPM_INTF_DATA_AVAIL_INT | TPM_INTF_STS_VALID_INT; > intmask &= ~TPM_GLOBAL_INT_ENABLE; > - iowrite32(intmask, > - phy->iobase + TPM_INT_ENABLE(phy->priv.locality)); > + tpm_write32(&phy->priv, TPM_INT_ENABLE(phy->priv.locality), intmask); > > if (request_locality(chip, 0) != 0) { > rc = -ENODEV; > @@ -758,12 +864,19 @@ static int tpm_tis_init(struct device *dev, struct tpm_info *tpm_info, > if (rc) > goto out_err; > > - vendor = ioread32(phy->iobase + TPM_DID_VID(0)); > + rc = tpm_read32(&phy->priv, TPM_DID_VID(0), &vendor); > + if (rc < 0) > + goto out_err; > + > phy->priv.manufacturer_id = vendor; > > + rc = tpm_read8(&phy->priv, TPM_RID(0), &rid); > + if (rc < 0) > + goto out_err; > + > dev_info(dev, "%s TPM (device-id 0x%X, rev-id %d)\n", > (chip->flags & TPM_CHIP_FLAG_TPM2) ? "2.0" : "1.2", > - vendor >> 16, ioread8(phy->iobase + TPM_RID(0))); > + vendor >> 16, rid); > > if (!itpm) { > probe = probe_itpm(chip); > @@ -777,11 +890,12 @@ static int tpm_tis_init(struct device *dev, struct tpm_info *tpm_info, > if (itpm) > dev_info(dev, "Intel iTPM workaround enabled\n"); > > - > /* Figure out the capabilities */ > - intfcaps = > - ioread32(phy->iobase + > - TPM_INTF_CAPS(phy->priv.locality)); > + rc = tpm_read32(&phy->priv, TPM_INTF_CAPS(phy->priv.locality), > + &intfcaps); > + if (rc < 0) > + goto out_err; > + > dev_dbg(dev, "TPM interface capabilities (0x%x):\n", > intfcaps); > if (intfcaps & TPM_INTF_BURST_COUNT_STATIC) > @@ -860,23 +974,24 @@ out_err: > static void tpm_tis_reenable_interrupts(struct tpm_chip *chip) > { > struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); > - struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(priv); > u32 intmask; > + int rc; > > /* reenable interrupts that device may have lost or > BIOS/firmware may have disabled */ > - iowrite8(priv->irq, phy->iobase + > - TPM_INT_VECTOR(priv->locality)); > + rc = tpm_write8(priv, TPM_INT_VECTOR(priv->locality), priv->irq); > + if (rc < 0) > + return; > > - intmask = > - ioread32(phy->iobase + TPM_INT_ENABLE(priv->locality)); > + rc = tpm_read32(priv, TPM_INT_ENABLE(priv->locality), &intmask); > + if (rc < 0) > + return; > > intmask |= TPM_INTF_CMD_READY_INT > | TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_DATA_AVAIL_INT > | TPM_INTF_STS_VALID_INT | TPM_GLOBAL_INT_ENABLE; > > - iowrite32(intmask, > - phy->iobase + TPM_INT_ENABLE(priv->locality)); > + tpm_write32(priv, TPM_INT_ENABLE(priv->locality), intmask); > } > > static int tpm_tis_resume(struct device *dev) > diff --git a/drivers/char/tpm/tpm_tis_core.h b/drivers/char/tpm/tpm_tis_core.h > index 2260f89..75e16d0 100644 > --- a/drivers/char/tpm/tpm_tis_core.h > +++ b/drivers/char/tpm/tpm_tis_core.h > @@ -32,6 +32,54 @@ struct tpm_tis_data { > bool irq_tested; > wait_queue_head_t int_queue; > wait_queue_head_t read_queue; > + const struct tpm_tis_phy_ops *phy_ops; > }; > > +struct tpm_tis_phy_ops { > + int (*read_bytes)(struct tpm_tis_data *data, u32 addr, u16 len, > + u8 *result); > + int (*write_bytes)(struct tpm_tis_data *data, u32 addr, u16 len, > + u8 *value); > + int (*read16)(struct tpm_tis_data *data, u32 addr, u16 *result); > + int (*read32)(struct tpm_tis_data *data, u32 addr, u32 *result); > + int (*write32)(struct tpm_tis_data *data, u32 addr, u32 src); > +}; > + > +static inline int tpm_read_bytes(struct tpm_tis_data *data, u32 addr, u16 len, > + u8 *result) > +{ > + return data->phy_ops->read_bytes(data, addr, len, result); > +} > + > +static inline int tpm_read8(struct tpm_tis_data *data, u32 addr, u8 *result) > +{ > + return data->phy_ops->read_bytes(data, addr, 1, result); > +} > + > +static inline int tpm_read16(struct tpm_tis_data *data, u32 addr, u16 *result) > +{ > + return data->phy_ops->read16(data, addr, result); > +} > + > +static inline int tpm_read32(struct tpm_tis_data *data, u32 addr, u32 *result) > +{ > + return data->phy_ops->read32(data, addr, result); > +} > + > +static inline int tpm_write_bytes(struct tpm_tis_data *data, u32 addr, u16 len, > + u8 *value) > +{ > + return data->phy_ops->write_bytes(data, addr, len, value); > +} > + > +static inline int tpm_write8(struct tpm_tis_data *data, u32 addr, u8 value) > +{ > + return data->phy_ops->write_bytes(data, addr, 1, &value); > +} > + > +static inline int tpm_write32(struct tpm_tis_data *data, u32 addr, u32 value) > +{ > + return data->phy_ops->write32(data, addr, value); > +} > + > #endif These should we with tpm_tis_ prefix. > -- > 2.1.4 /Jarkko ------------------------------------------------------------------------------ Mobile security can be enabling, not merely restricting. 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diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c index cd5bb63..e88e321 100644 --- a/drivers/char/tpm/tpm_tis.c +++ b/drivers/char/tpm/tpm_tis.c @@ -134,11 +134,16 @@ static inline int is_itpm(struct acpi_device *dev) static int wait_startup(struct tpm_chip *chip, int l) { struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); - struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(priv); unsigned long stop = jiffies + chip->timeout_a; + int rc; + u8 access; + do { - if (ioread8(phy->iobase + TPM_ACCESS(l)) & - TPM_ACCESS_VALID) + rc = tpm_read8(priv, TPM_ACCESS(l), &access); + if (rc < 0) + return rc; + + if (access & TPM_ACCESS_VALID) return 0; msleep(TPM_TIMEOUT); } while (time_before(jiffies, stop)); @@ -148,10 +153,14 @@ static int wait_startup(struct tpm_chip *chip, int l) static int check_locality(struct tpm_chip *chip, int l) { struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); - struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(priv); + int rc; + u8 access; + + rc = tpm_read8(priv, TPM_ACCESS(l), &access); + if (rc < 0) + return rc; - if ((ioread8(phy->iobase + TPM_ACCESS(l)) & - (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) == + if ((access & (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) == (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) return priv->locality = l; @@ -161,27 +170,32 @@ static int check_locality(struct tpm_chip *chip, int l) static void release_locality(struct tpm_chip *chip, int l, int force) { struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); - struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(priv); + int rc; + u8 access; + + rc = tpm_read8(priv, TPM_ACCESS(l), &access); + if (rc < 0) + return; - if (force || (ioread8(phy->iobase + TPM_ACCESS(l)) & + if (force || (access & (TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID)) == (TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID)) - iowrite8(TPM_ACCESS_ACTIVE_LOCALITY, - phy->iobase + TPM_ACCESS(l)); + tpm_write8(priv, TPM_ACCESS(l), TPM_ACCESS_ACTIVE_LOCALITY); + } static int request_locality(struct tpm_chip *chip, int l) { struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); - struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(priv); unsigned long stop, timeout; long rc; if (check_locality(chip, l) >= 0) return l; - iowrite8(TPM_ACCESS_REQUEST_USE, - phy->iobase + TPM_ACCESS(l)); + rc = tpm_write8(priv, TPM_ACCESS(l), TPM_ACCESS_REQUEST_USE); + if (rc < 0) + return rc; stop = jiffies + chip->timeout_a; @@ -215,38 +229,45 @@ again: static u8 tpm_tis_status(struct tpm_chip *chip) { struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); - struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(priv); + int rc; + u8 status; + + rc = tpm_read8(priv, TPM_STS(priv->locality), &status); + if (rc < 0) + return 0; - return ioread8(phy->iobase + - TPM_STS(priv->locality)); + return status; } static void tpm_tis_ready(struct tpm_chip *chip) { struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); - struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(priv); /* this causes the current command to be aborted */ - iowrite8(TPM_STS_COMMAND_READY, - phy->iobase + TPM_STS(priv->locality)); + tpm_write8(priv, TPM_STS(priv->locality), TPM_STS_COMMAND_READY); } static int get_burstcount(struct tpm_chip *chip) { struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); - struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(priv); unsigned long stop; - int burstcnt; + int burstcnt, rc; + u8 value; /* wait for burstcount */ /* which timeout value, spec has 2 answers (c & d) */ stop = jiffies + chip->timeout_d; do { - burstcnt = ioread8(phy->iobase + - TPM_STS(priv->locality) + 1); - burstcnt += ioread8(phy->iobase + - TPM_STS(priv->locality) + - 2) << 8; + rc = tpm_read8(priv, TPM_STS(priv->locality) + 1, &value); + if (rc < 0) + return rc; + + burstcnt = value; + rc = tpm_read8(priv, TPM_STS(priv->locality) + 2, &value); + if (rc < 0) + return rc; + + burstcnt += value << 8; if (burstcnt) return burstcnt; msleep(TPM_TIMEOUT); @@ -257,18 +278,20 @@ static int get_burstcount(struct tpm_chip *chip) static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count) { struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); - struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(priv); - int size = 0, burstcnt; + int size = 0, burstcnt, rc; + while (size < count && wait_for_tpm_stat(chip, TPM_STS_DATA_AVAIL | TPM_STS_VALID, chip->timeout_c, - &priv->read_queue, true) - == 0) { - burstcnt = get_burstcount(chip); - for (; burstcnt > 0 && size < count; burstcnt--) - buf[size++] = ioread8(phy->iobase + - TPM_DATA_FIFO(priv->locality)); + &priv->read_queue, true) == 0) { + burstcnt = min_t(int, get_burstcount(chip), count - size); + rc = tpm_read_bytes(priv, TPM_DATA_FIFO(priv->locality), + burstcnt, buf + size); + if (rc < 0) + return rc; + + size += burstcnt; } return size; } @@ -332,7 +355,6 @@ MODULE_PARM_DESC(itpm, "Force iTPM workarounds (found on some Lenovo laptops)"); static int tpm_tis_send_data(struct tpm_chip *chip, u8 *buf, size_t len) { struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); - struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(priv); int rc, status, burstcnt; size_t count = 0; @@ -351,12 +373,13 @@ static int tpm_tis_send_data(struct tpm_chip *chip, u8 *buf, size_t len) } while (count < len - 1) { - burstcnt = get_burstcount(chip); - for (; burstcnt > 0 && count < len - 1; burstcnt--) { - iowrite8(buf[count], phy->iobase + - TPM_DATA_FIFO(priv->locality)); - count++; - } + burstcnt = min_t(int, get_burstcount(chip), len - count - 1); + rc = tpm_write_bytes(priv, TPM_DATA_FIFO(priv->locality), + burstcnt, buf + count); + if (rc < 0) + goto out_err; + + count += burstcnt; wait_for_tpm_stat(chip, TPM_STS_VALID, chip->timeout_c, &priv->int_queue, false); @@ -368,8 +391,10 @@ static int tpm_tis_send_data(struct tpm_chip *chip, u8 *buf, size_t len) } /* write last byte */ - iowrite8(buf[count], - phy->iobase + TPM_DATA_FIFO(priv->locality)); + rc = tpm_write8(priv, TPM_DATA_FIFO(priv->locality), buf[count]); + if (rc < 0) + goto out_err; + wait_for_tpm_stat(chip, TPM_STS_VALID, chip->timeout_c, &priv->int_queue, false); status = tpm_tis_status(chip); @@ -389,15 +414,16 @@ out_err: static void disable_interrupts(struct tpm_chip *chip) { struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); - struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(priv); u32 intmask; + int rc; + + rc = tpm_read32(priv, TPM_INT_ENABLE(priv->locality), &intmask); + if (rc < 0) + intmask = 0; - intmask = - ioread32(phy->iobase + - TPM_INT_ENABLE(priv->locality)); intmask &= ~TPM_GLOBAL_INT_ENABLE; - iowrite32(intmask, - phy->iobase + TPM_INT_ENABLE(priv->locality)); + tpm_write32(priv, TPM_INT_ENABLE(priv->locality), intmask); + devm_free_irq(chip->dev.parent, priv->irq, chip); priv->irq = 0; chip->flags &= ~TPM_CHIP_FLAG_IRQ; @@ -411,7 +437,6 @@ static void disable_interrupts(struct tpm_chip *chip) static int tpm_tis_send_main(struct tpm_chip *chip, u8 *buf, size_t len) { struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); - struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(priv); int rc; u32 ordinal; unsigned long dur; @@ -421,8 +446,9 @@ static int tpm_tis_send_main(struct tpm_chip *chip, u8 *buf, size_t len) return rc; /* go and do it */ - iowrite8(TPM_STS_GO, - phy->iobase + TPM_STS(priv->locality)); + rc = tpm_write8(priv, TPM_STS(priv->locality), TPM_STS_GO); + if (rc < 0) + return rc; if (chip->flags & TPM_CHIP_FLAG_IRQ) { ordinal = be32_to_cpu(*((__be32 *) (buf + 6))); @@ -484,11 +510,12 @@ static bool tpm_tis_update_timeouts(struct tpm_chip *chip, unsigned long *timeout_cap) { struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); - struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(priv); - int i; + int i, rc; u32 did_vid; - did_vid = ioread32(phy->iobase + TPM_DID_VID(0)); + rc = tpm_read32(priv, TPM_DID_VID(0), &did_vid); + if (rc < 0) + return rc; for (i = 0; i != ARRAY_SIZE(vendor_timeout_overrides); i++) { if (vendor_timeout_overrides[i].did_vid != did_vid) @@ -509,7 +536,6 @@ static bool tpm_tis_update_timeouts(struct tpm_chip *chip, static int probe_itpm(struct tpm_chip *chip) { struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); - struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(priv); int rc = 0; u8 cmd_getticks[] = { 0x00, 0xc1, 0x00, 0x00, 0x00, 0x0a, @@ -517,7 +543,11 @@ static int probe_itpm(struct tpm_chip *chip) }; size_t len = sizeof(cmd_getticks); bool rem_itpm = itpm; - u16 vendor = ioread16(phy->iobase + TPM_DID_VID(0)); + u16 vendor; + + rc = tpm_read16(priv, TPM_DID_VID(0), &vendor); + if (rc < 0) + return rc; /* probe only iTPMS */ if (vendor != TPM_VID_INTEL) @@ -575,16 +605,68 @@ static const struct tpm_class_ops tpm_tis = { .req_canceled = tpm_tis_req_canceled, }; +static int tpm_tcg_read_bytes(struct tpm_tis_data *data, u32 addr, u16 len, + u8 *result) +{ + struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data); + + while (len--) + *result++ = ioread8(phy->iobase + addr); + return 0; +} + +static int tpm_tcg_write_bytes(struct tpm_tis_data *data, u32 addr, u16 len, + u8 *value) +{ + struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data); + + while (len--) + iowrite8(*value++, phy->iobase + addr); + return 0; +} + +static int tpm_tcg_read16(struct tpm_tis_data *data, u32 addr, u16 *result) +{ + struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data); + + *result = ioread16(phy->iobase + addr); + return 0; +} + +static int tpm_tcg_read32(struct tpm_tis_data *data, u32 addr, u32 *result) +{ + struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data); + + *result = ioread32(phy->iobase + addr); + return 0; +} + +static int tpm_tcg_write32(struct tpm_tis_data *data, u32 addr, u32 value) +{ + struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data); + + iowrite32(value, phy->iobase + addr); + return 0; +} + +static const struct tpm_tis_phy_ops tpm_tcg = { + .read_bytes = tpm_tcg_read_bytes, + .write_bytes = tpm_tcg_write_bytes, + .read16 = tpm_tcg_read16, + .read32 = tpm_tcg_read32, + .write32 = tpm_tcg_write32, +}; + static irqreturn_t tis_int_handler(int dummy, void *dev_id) { struct tpm_chip *chip = dev_id; struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); - struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(priv); u32 interrupt; - int i; + int i, rc; - interrupt = ioread32(phy->iobase + - TPM_INT_STATUS(priv->locality)); + rc = tpm_read32(priv, TPM_INT_STATUS(priv->locality), &interrupt); + if (rc < 0) + return IRQ_NONE; if (interrupt == 0) return IRQ_NONE; @@ -602,10 +684,11 @@ static irqreturn_t tis_int_handler(int dummy, void *dev_id) wake_up_interruptible(&priv->int_queue); /* Clear interrupts handled with TPM_EOI */ - iowrite32(interrupt, - phy->iobase + - TPM_INT_STATUS(priv->locality)); - ioread32(phy->iobase + TPM_INT_STATUS(priv->locality)); + rc = tpm_write32(priv, TPM_INT_STATUS(priv->locality), interrupt); + if (rc < 0) + return IRQ_NONE; + + tpm_read32(priv, TPM_INT_STATUS(priv->locality), &interrupt); return IRQ_HANDLED; } @@ -617,8 +700,9 @@ static int tpm_tis_probe_irq_single(struct tpm_chip *chip, u32 intmask, int flags, int irq) { struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); - struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(priv); u8 original_int_vec; + int rc; + u32 int_status; if (devm_request_irq(chip->dev.parent, irq, tis_int_handler, flags, dev_name(&chip->dev), chip) != 0) { @@ -628,19 +712,28 @@ static int tpm_tis_probe_irq_single(struct tpm_chip *chip, u32 intmask, } priv->irq = irq; - original_int_vec = ioread8(phy->iobase + - TPM_INT_VECTOR(priv->locality)); - iowrite8(irq, - phy->iobase + TPM_INT_VECTOR(priv->locality)); + rc = tpm_read8(priv, TPM_INT_VECTOR(priv->locality), &original_int_vec); + if (rc < 0) + return rc; + + rc = tpm_write8(priv, TPM_INT_VECTOR(priv->locality), irq); + if (rc < 0) + return rc; + + rc = tpm_read32(priv, TPM_INT_STATUS(priv->locality), &int_status); + if (rc < 0) + return rc; /* Clear all existing */ - iowrite32(ioread32(phy->iobase + - TPM_INT_STATUS(priv->locality)), - phy->iobase + TPM_INT_STATUS(priv->locality)); + rc = tpm_write32(priv, TPM_INT_STATUS(priv->locality), int_status); + if (rc < 0) + return rc; /* Turn on */ - iowrite32(intmask | TPM_GLOBAL_INT_ENABLE, - phy->iobase + TPM_INT_ENABLE(priv->locality)); + rc = tpm_write32(priv, TPM_INT_ENABLE(priv->locality), + intmask | TPM_GLOBAL_INT_ENABLE); + if (rc < 0) + return rc; priv->irq_tested = false; @@ -656,8 +749,11 @@ static int tpm_tis_probe_irq_single(struct tpm_chip *chip, u32 intmask, * will call disable_irq which undoes all of the above. */ if (!(chip->flags & TPM_CHIP_FLAG_IRQ)) { - iowrite8(original_int_vec, - phy->iobase + TPM_INT_VECTOR(priv->locality)); + rc = tpm_write8(priv, TPM_INT_VECTOR(priv->locality), + original_int_vec); + if (rc < 0) + return rc; + return 1; } @@ -671,12 +767,12 @@ static int tpm_tis_probe_irq_single(struct tpm_chip *chip, u32 intmask, static void tpm_tis_probe_irq(struct tpm_chip *chip, u32 intmask) { struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); - struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(priv); u8 original_int_vec; - int i; + int i, rc; - original_int_vec = ioread8(phy->iobase + - TPM_INT_VECTOR(priv->locality)); + rc = tpm_read8(priv, TPM_INT_VECTOR(priv->locality), &original_int_vec); + if (rc < 0) + return; if (!original_int_vec) { if (IS_ENABLED(CONFIG_X86)) @@ -696,10 +792,15 @@ MODULE_PARM_DESC(interrupts, "Enable interrupts"); static void tpm_tis_remove(struct tpm_chip *chip) { struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); - struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(priv); - void __iomem *reg = phy->iobase + TPM_INT_ENABLE(priv->locality); + u32 reg = TPM_INT_ENABLE(priv->locality); + u32 interrupt; + int rc; + + rc = tpm_read32(priv, reg, &interrupt); + if (rc < 0) + interrupt = 0; - iowrite32(~TPM_GLOBAL_INT_ENABLE & ioread32(reg), reg); + tpm_write32(priv, reg, ~TPM_GLOBAL_INT_ENABLE & interrupt); release_locality(chip, priv->locality, 1); } @@ -707,6 +808,7 @@ static int tpm_tis_init(struct device *dev, struct tpm_info *tpm_info, acpi_handle acpi_dev_handle) { u32 vendor, intfcaps, intmask; + u8 rid; int rc, probe; struct tpm_chip *chip; struct tpm_tis_tcg_phy *phy; @@ -727,6 +829,8 @@ static int tpm_tis_init(struct device *dev, struct tpm_info *tpm_info, if (IS_ERR(phy->iobase)) return PTR_ERR(phy->iobase); + phy->priv.phy_ops = &tpm_tcg; + /* Maximum timeouts */ chip->timeout_a = TIS_TIMEOUT_A_MAX; chip->timeout_b = TIS_TIMEOUT_B_MAX; @@ -741,13 +845,15 @@ static int tpm_tis_init(struct device *dev, struct tpm_info *tpm_info, } /* Take control of the TPM's interrupt hardware and shut it off */ - intmask = ioread32(phy->iobase + - TPM_INT_ENABLE(phy->priv.locality)); + rc = tpm_read32(&phy->priv, TPM_INT_ENABLE(phy->priv.locality), + &intmask); + if (rc < 0) + goto out_err; + intmask |= TPM_INTF_CMD_READY_INT | TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_DATA_AVAIL_INT | TPM_INTF_STS_VALID_INT; intmask &= ~TPM_GLOBAL_INT_ENABLE; - iowrite32(intmask, - phy->iobase + TPM_INT_ENABLE(phy->priv.locality)); + tpm_write32(&phy->priv, TPM_INT_ENABLE(phy->priv.locality), intmask); if (request_locality(chip, 0) != 0) { rc = -ENODEV; @@ -758,12 +864,19 @@ static int tpm_tis_init(struct device *dev, struct tpm_info *tpm_info, if (rc) goto out_err; - vendor = ioread32(phy->iobase + TPM_DID_VID(0)); + rc = tpm_read32(&phy->priv, TPM_DID_VID(0), &vendor); + if (rc < 0) + goto out_err; + phy->priv.manufacturer_id = vendor; + rc = tpm_read8(&phy->priv, TPM_RID(0), &rid); + if (rc < 0) + goto out_err; + dev_info(dev, "%s TPM (device-id 0x%X, rev-id %d)\n", (chip->flags & TPM_CHIP_FLAG_TPM2) ? "2.0" : "1.2", - vendor >> 16, ioread8(phy->iobase + TPM_RID(0))); + vendor >> 16, rid); if (!itpm) { probe = probe_itpm(chip); @@ -777,11 +890,12 @@ static int tpm_tis_init(struct device *dev, struct tpm_info *tpm_info, if (itpm) dev_info(dev, "Intel iTPM workaround enabled\n"); - /* Figure out the capabilities */ - intfcaps = - ioread32(phy->iobase + - TPM_INTF_CAPS(phy->priv.locality)); + rc = tpm_read32(&phy->priv, TPM_INTF_CAPS(phy->priv.locality), + &intfcaps); + if (rc < 0) + goto out_err; + dev_dbg(dev, "TPM interface capabilities (0x%x):\n", intfcaps); if (intfcaps & TPM_INTF_BURST_COUNT_STATIC) @@ -860,23 +974,24 @@ out_err: static void tpm_tis_reenable_interrupts(struct tpm_chip *chip) { struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); - struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(priv); u32 intmask; + int rc; /* reenable interrupts that device may have lost or BIOS/firmware may have disabled */ - iowrite8(priv->irq, phy->iobase + - TPM_INT_VECTOR(priv->locality)); + rc = tpm_write8(priv, TPM_INT_VECTOR(priv->locality), priv->irq); + if (rc < 0) + return; - intmask = - ioread32(phy->iobase + TPM_INT_ENABLE(priv->locality)); + rc = tpm_read32(priv, TPM_INT_ENABLE(priv->locality), &intmask); + if (rc < 0) + return; intmask |= TPM_INTF_CMD_READY_INT | TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_DATA_AVAIL_INT | TPM_INTF_STS_VALID_INT | TPM_GLOBAL_INT_ENABLE; - iowrite32(intmask, - phy->iobase + TPM_INT_ENABLE(priv->locality)); + tpm_write32(priv, TPM_INT_ENABLE(priv->locality), intmask); } static int tpm_tis_resume(struct device *dev) diff --git a/drivers/char/tpm/tpm_tis_core.h b/drivers/char/tpm/tpm_tis_core.h index 2260f89..75e16d0 100644 --- a/drivers/char/tpm/tpm_tis_core.h +++ b/drivers/char/tpm/tpm_tis_core.h @@ -32,6 +32,54 @@ struct tpm_tis_data { bool irq_tested; wait_queue_head_t int_queue; wait_queue_head_t read_queue; + const struct tpm_tis_phy_ops *phy_ops; }; +struct tpm_tis_phy_ops { + int (*read_bytes)(struct tpm_tis_data *data, u32 addr, u16 len, + u8 *result); + int (*write_bytes)(struct tpm_tis_data *data, u32 addr, u16 len, + u8 *value); + int (*read16)(struct tpm_tis_data *data, u32 addr, u16 *result); + int (*read32)(struct tpm_tis_data *data, u32 addr, u32 *result); + int (*write32)(struct tpm_tis_data *data, u32 addr, u32 src); +}; + +static inline int tpm_read_bytes(struct tpm_tis_data *data, u32 addr, u16 len, + u8 *result) +{ + return data->phy_ops->read_bytes(data, addr, len, result); +} + +static inline int tpm_read8(struct tpm_tis_data *data, u32 addr, u8 *result) +{ + return data->phy_ops->read_bytes(data, addr, 1, result); +} + +static inline int tpm_read16(struct tpm_tis_data *data, u32 addr, u16 *result) +{ + return data->phy_ops->read16(data, addr, result); +} + +static inline int tpm_read32(struct tpm_tis_data *data, u32 addr, u32 *result) +{ + return data->phy_ops->read32(data, addr, result); +} + +static inline int tpm_write_bytes(struct tpm_tis_data *data, u32 addr, u16 len, + u8 *value) +{ + return data->phy_ops->write_bytes(data, addr, len, value); +} + +static inline int tpm_write8(struct tpm_tis_data *data, u32 addr, u8 value) +{ + return data->phy_ops->write_bytes(data, addr, 1, &value); +} + +static inline int tpm_write32(struct tpm_tis_data *data, u32 addr, u32 value) +{ + return data->phy_ops->write32(data, addr, value); +} + #endif