diff options
Diffstat (limited to 'drivers/char/tpm/tpm_tis.c')
| -rw-r--r-- | drivers/char/tpm/tpm_tis.c | 902 |
1 files changed, 20 insertions, 882 deletions
diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c index 29254f045e5f..eaf5730d79eb 100644 --- a/drivers/char/tpm/tpm_tis.c +++ b/drivers/char/tpm/tpm_tis.c @@ -31,40 +31,6 @@ #include "tpm.h" #include "tpm_tis_core.h" -enum tis_access { - TPM_ACCESS_VALID = 0x80, - TPM_ACCESS_ACTIVE_LOCALITY = 0x20, - TPM_ACCESS_REQUEST_PENDING = 0x04, - TPM_ACCESS_REQUEST_USE = 0x02, -}; - -enum tis_status { - TPM_STS_VALID = 0x80, - TPM_STS_COMMAND_READY = 0x40, - TPM_STS_GO = 0x20, - TPM_STS_DATA_AVAIL = 0x10, - TPM_STS_DATA_EXPECT = 0x08, -}; - -enum tis_int_flags { - TPM_GLOBAL_INT_ENABLE = 0x80000000, - TPM_INTF_BURST_COUNT_STATIC = 0x100, - TPM_INTF_CMD_READY_INT = 0x080, - TPM_INTF_INT_EDGE_FALLING = 0x040, - TPM_INTF_INT_EDGE_RISING = 0x020, - TPM_INTF_INT_LEVEL_LOW = 0x010, - TPM_INTF_INT_LEVEL_HIGH = 0x008, - TPM_INTF_LOCALITY_CHANGE_INT = 0x004, - TPM_INTF_STS_VALID_INT = 0x002, - TPM_INTF_DATA_AVAIL_INT = 0x001, -}; - -enum tis_defaults { - TIS_MEM_LEN = 0x5000, - TIS_SHORT_TIMEOUT = 750, /* ms */ - TIS_LONG_TIMEOUT = 2000, /* 2 sec */ -}; - struct tpm_info { struct resource res; /* irq > 0 means: use irq $irq; @@ -74,26 +40,6 @@ struct tpm_info { int irq; }; -/* Some timeout values are needed before it is known whether the chip is - * TPM 1.0 or TPM 2.0. - */ -#define TIS_TIMEOUT_A_MAX max(TIS_SHORT_TIMEOUT, TPM2_TIMEOUT_A) -#define TIS_TIMEOUT_B_MAX max(TIS_LONG_TIMEOUT, TPM2_TIMEOUT_B) -#define TIS_TIMEOUT_C_MAX max(TIS_SHORT_TIMEOUT, TPM2_TIMEOUT_C) -#define TIS_TIMEOUT_D_MAX max(TIS_SHORT_TIMEOUT, TPM2_TIMEOUT_D) - -#define TPM_ACCESS(l) (0x0000 | ((l) << 12)) -#define TPM_INT_ENABLE(l) (0x0008 | ((l) << 12)) -#define TPM_INT_VECTOR(l) (0x000C | ((l) << 12)) -#define TPM_INT_STATUS(l) (0x0010 | ((l) << 12)) -#define TPM_INTF_CAPS(l) (0x0014 | ((l) << 12)) -#define TPM_STS(l) (0x0018 | ((l) << 12)) -#define TPM_STS3(l) (0x001b | ((l) << 12)) -#define TPM_DATA_FIFO(l) (0x0024 | ((l) << 12)) - -#define TPM_DID_VID(l) (0x0F00 | ((l) << 12)) -#define TPM_RID(l) (0x0F04 | ((l) << 12)) - struct tpm_tis_tcg_phy { struct tpm_tis_data priv; void __iomem *iobase; @@ -104,6 +50,20 @@ static inline struct tpm_tis_tcg_phy *to_tpm_tis_tcg_phy(struct tpm_tis_data *da return container_of(data, struct tpm_tis_tcg_phy, priv); } +static bool interrupts = true; +module_param(interrupts, bool, 0444); +MODULE_PARM_DESC(interrupts, "Enable interrupts"); + +static bool itpm; +module_param(itpm, bool, 0444); +MODULE_PARM_DESC(itpm, "Force iTPM workarounds (found on some Lenovo laptops)"); + +static bool force; +#ifdef CONFIG_X86 +module_param(force, bool, 0444); +MODULE_PARM_DESC(force, "Force device probe rather than using ACPI entry"); +#endif + #if defined(CONFIG_PNP) && defined(CONFIG_ACPI) static int has_hid(struct acpi_device *dev, const char *hid) { @@ -127,484 +87,6 @@ static inline int is_itpm(struct acpi_device *dev) } #endif -/* Before we attempt to access the TPM we must see that the valid bit is set. - * The specification says that this bit is 0 at reset and remains 0 until the - * 'TPM has gone through its self test and initialization and has established - * correct values in the other bits.' */ -static int wait_startup(struct tpm_chip *chip, int l) -{ - struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); - unsigned long stop = jiffies + chip->timeout_a; - int rc; - u8 access; - - do { - rc = tpm_tis_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)); - return -1; -} - -static int check_locality(struct tpm_chip *chip, int l) -{ - struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); - int rc; - u8 access; - - rc = tpm_tis_read8(priv, TPM_ACCESS(l), &access); - if (rc < 0) - return rc; - - if ((access & (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) == - (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) - return priv->locality = l; - - return -1; -} - -static void release_locality(struct tpm_chip *chip, int l, int force) -{ - struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); - int rc; - u8 access; - - rc = tpm_tis_read8(priv, TPM_ACCESS(l), &access); - if (rc < 0) - return; - - if (force || (access & - (TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID)) == - (TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID)) - tpm_tis_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); - unsigned long stop, timeout; - long rc; - - if (check_locality(chip, l) >= 0) - return l; - - rc = tpm_tis_write8(priv, TPM_ACCESS(l), TPM_ACCESS_REQUEST_USE); - if (rc < 0) - return rc; - - stop = jiffies + chip->timeout_a; - - if (chip->flags & TPM_CHIP_FLAG_IRQ) { -again: - timeout = stop - jiffies; - if ((long)timeout <= 0) - return -1; - rc = wait_event_interruptible_timeout(priv->int_queue, - (check_locality - (chip, l) >= 0), - timeout); - if (rc > 0) - return l; - if (rc == -ERESTARTSYS && freezing(current)) { - clear_thread_flag(TIF_SIGPENDING); - goto again; - } - } else { - /* wait for burstcount */ - do { - if (check_locality(chip, l) >= 0) - return l; - msleep(TPM_TIMEOUT); - } - while (time_before(jiffies, stop)); - } - return -1; -} - -static u8 tpm_tis_status(struct tpm_chip *chip) -{ - struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); - int rc; - u8 status; - - rc = tpm_tis_read8(priv, TPM_STS(priv->locality), &status); - if (rc < 0) - return 0; - - return status; -} - -static void tpm_tis_ready(struct tpm_chip *chip) -{ - struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); - - /* this causes the current command to be aborted */ - tpm_tis_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); - unsigned long stop; - int burstcnt, rc; - u8 value; - - /* wait for burstcount */ - /* which timeout value, spec has 2 answers (c & d) */ - stop = jiffies + chip->timeout_d; - do { - rc = tpm_tis_read8(priv, TPM_STS(priv->locality) + 1, &value); - if (rc < 0) - return rc; - - burstcnt = value; - rc = tpm_tis_read8(priv, TPM_STS(priv->locality) + 2, &value); - if (rc < 0) - return rc; - - burstcnt += value << 8; - if (burstcnt) - return burstcnt; - msleep(TPM_TIMEOUT); - } while (time_before(jiffies, stop)); - return -EBUSY; -} - -static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count) -{ - struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); - 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 = min_t(int, get_burstcount(chip), count - size); - rc = tpm_tis_read_bytes(priv, TPM_DATA_FIFO(priv->locality), - burstcnt, buf + size); - if (rc < 0) - return rc; - - size += burstcnt; - } - return size; -} - -static int tpm_tis_recv(struct tpm_chip *chip, u8 *buf, size_t count) -{ - struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); - int size = 0; - int expected, status; - - if (count < TPM_HEADER_SIZE) { - size = -EIO; - goto out; - } - - /* read first 10 bytes, including tag, paramsize, and result */ - if ((size = - recv_data(chip, buf, TPM_HEADER_SIZE)) < TPM_HEADER_SIZE) { - dev_err(&chip->dev, "Unable to read header\n"); - goto out; - } - - expected = be32_to_cpu(*(__be32 *) (buf + 2)); - if (expected > count) { - size = -EIO; - goto out; - } - - if ((size += - recv_data(chip, &buf[TPM_HEADER_SIZE], - expected - TPM_HEADER_SIZE)) < expected) { - dev_err(&chip->dev, "Unable to read remainder of result\n"); - size = -ETIME; - goto out; - } - - wait_for_tpm_stat(chip, TPM_STS_VALID, chip->timeout_c, - &priv->int_queue, false); - status = tpm_tis_status(chip); - if (status & TPM_STS_DATA_AVAIL) { /* retry? */ - dev_err(&chip->dev, "Error left over data\n"); - size = -EIO; - goto out; - } - -out: - tpm_tis_ready(chip); - release_locality(chip, priv->locality, 0); - return size; -} - -static bool itpm; -module_param(itpm, bool, 0444); -MODULE_PARM_DESC(itpm, "Force iTPM workarounds (found on some Lenovo laptops)"); - -/* - * If interrupts are used (signaled by an irq set in the vendor structure) - * tpm.c can skip polling for the data to be available as the interrupt is - * waited for here - */ -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); - int rc, status, burstcnt; - size_t count = 0; - - if (request_locality(chip, 0) < 0) - return -EBUSY; - - status = tpm_tis_status(chip); - if ((status & TPM_STS_COMMAND_READY) == 0) { - tpm_tis_ready(chip); - if (wait_for_tpm_stat - (chip, TPM_STS_COMMAND_READY, chip->timeout_b, - &priv->int_queue, false) < 0) { - rc = -ETIME; - goto out_err; - } - } - - while (count < len - 1) { - burstcnt = min_t(int, get_burstcount(chip), len - count - 1); - rc = tpm_tis_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); - status = tpm_tis_status(chip); - if (!itpm && (status & TPM_STS_DATA_EXPECT) == 0) { - rc = -EIO; - goto out_err; - } - } - - /* write last byte */ - rc = tpm_tis_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); - if ((status & TPM_STS_DATA_EXPECT) != 0) { - rc = -EIO; - goto out_err; - } - - return 0; - -out_err: - tpm_tis_ready(chip); - release_locality(chip, priv->locality, 0); - return rc; -} - -static void disable_interrupts(struct tpm_chip *chip) -{ - struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); - u32 intmask; - int rc; - - rc = tpm_tis_read32(priv, TPM_INT_ENABLE(priv->locality), &intmask); - if (rc < 0) - intmask = 0; - - intmask &= ~TPM_GLOBAL_INT_ENABLE; - tpm_tis_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; -} - -/* - * If interrupts are used (signaled by an irq set in the vendor structure) - * tpm.c can skip polling for the data to be available as the interrupt is - * waited for here - */ -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); - int rc; - u32 ordinal; - unsigned long dur; - - rc = tpm_tis_send_data(chip, buf, len); - if (rc < 0) - return rc; - - /* go and do it */ - rc = tpm_tis_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))); - - if (chip->flags & TPM_CHIP_FLAG_TPM2) - dur = tpm2_calc_ordinal_duration(chip, ordinal); - else - dur = tpm_calc_ordinal_duration(chip, ordinal); - - if (wait_for_tpm_stat - (chip, TPM_STS_DATA_AVAIL | TPM_STS_VALID, dur, - &priv->read_queue, false) < 0) { - rc = -ETIME; - goto out_err; - } - } - return len; -out_err: - tpm_tis_ready(chip); - release_locality(chip, priv->locality, 0); - return rc; -} - -static int tpm_tis_send(struct tpm_chip *chip, u8 *buf, size_t len) -{ - struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); - int rc, irq; - - if (!(chip->flags & TPM_CHIP_FLAG_IRQ) || priv->irq_tested) - return tpm_tis_send_main(chip, buf, len); - - /* Verify receipt of the expected IRQ */ - irq = priv->irq; - priv->irq = 0; - chip->flags &= ~TPM_CHIP_FLAG_IRQ; - rc = tpm_tis_send_main(chip, buf, len); - priv->irq = irq; - chip->flags |= TPM_CHIP_FLAG_IRQ; - if (!priv->irq_tested) - msleep(1); - if (!priv->irq_tested) - disable_interrupts(chip); - priv->irq_tested = true; - return rc; -} - -struct tis_vendor_timeout_override { - u32 did_vid; - unsigned long timeout_us[4]; -}; - -static const struct tis_vendor_timeout_override vendor_timeout_overrides[] = { - /* Atmel 3204 */ - { 0x32041114, { (TIS_SHORT_TIMEOUT*1000), (TIS_LONG_TIMEOUT*1000), - (TIS_SHORT_TIMEOUT*1000), (TIS_SHORT_TIMEOUT*1000) } }, -}; - -static bool tpm_tis_update_timeouts(struct tpm_chip *chip, - unsigned long *timeout_cap) -{ - struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); - int i, rc; - u32 did_vid; - - rc = tpm_tis_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) - continue; - memcpy(timeout_cap, vendor_timeout_overrides[i].timeout_us, - sizeof(vendor_timeout_overrides[i].timeout_us)); - return true; - } - - return false; -} - -/* - * Early probing for iTPM with STS_DATA_EXPECT flaw. - * Try sending command without itpm flag set and if that - * fails, repeat with itpm flag set. - */ -static int probe_itpm(struct tpm_chip *chip) -{ - struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); - int rc = 0; - u8 cmd_getticks[] = { - 0x00, 0xc1, 0x00, 0x00, 0x00, 0x0a, - 0x00, 0x00, 0x00, 0xf1 - }; - size_t len = sizeof(cmd_getticks); - bool rem_itpm = itpm; - u16 vendor; - - rc = tpm_tis_read16(priv, TPM_DID_VID(0), &vendor); - if (rc < 0) - return rc; - - /* probe only iTPMS */ - if (vendor != TPM_VID_INTEL) - return 0; - - itpm = false; - - rc = tpm_tis_send_data(chip, cmd_getticks, len); - if (rc == 0) - goto out; - - tpm_tis_ready(chip); - release_locality(chip, priv->locality, 0); - - itpm = true; - - rc = tpm_tis_send_data(chip, cmd_getticks, len); - if (rc == 0) { - dev_info(&chip->dev, "Detected an iTPM.\n"); - rc = 1; - } else - rc = -EFAULT; - -out: - itpm = rem_itpm; - tpm_tis_ready(chip); - release_locality(chip, priv->locality, 0); - - return rc; -} - -static bool tpm_tis_req_canceled(struct tpm_chip *chip, u8 status) -{ - struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); - - switch (priv->manufacturer_id) { - case TPM_VID_WINBOND: - return ((status == TPM_STS_VALID) || - (status == (TPM_STS_VALID | TPM_STS_COMMAND_READY))); - case TPM_VID_STM: - return (status == (TPM_STS_VALID | TPM_STS_COMMAND_READY)); - default: - return (status == TPM_STS_COMMAND_READY); - } -} - -static const struct tpm_class_ops tpm_tis = { - .status = tpm_tis_status, - .recv = tpm_tis_recv, - .send = tpm_tis_send, - .cancel = tpm_tis_ready, - .update_timeouts = tpm_tis_update_timeouts, - .req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID, - .req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID, - .req_canceled = tpm_tis_req_canceled, -}; - static int tpm_tcg_read_bytes(struct tpm_tis_data *data, u32 addr, u16 len, u8 *result) { @@ -657,367 +139,29 @@ static const struct tpm_tis_phy_ops tpm_tcg = { .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); - u32 interrupt; - int i, rc; - - rc = tpm_tis_read32(priv, TPM_INT_STATUS(priv->locality), &interrupt); - if (rc < 0) - return IRQ_NONE; - - if (interrupt == 0) - return IRQ_NONE; - - priv->irq_tested = true; - if (interrupt & TPM_INTF_DATA_AVAIL_INT) - wake_up_interruptible(&priv->read_queue); - if (interrupt & TPM_INTF_LOCALITY_CHANGE_INT) - for (i = 0; i < 5; i++) - if (check_locality(chip, i) >= 0) - break; - if (interrupt & - (TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_STS_VALID_INT | - TPM_INTF_CMD_READY_INT)) - wake_up_interruptible(&priv->int_queue); - - /* Clear interrupts handled with TPM_EOI */ - rc = tpm_tis_write32(priv, TPM_INT_STATUS(priv->locality), interrupt); - if (rc < 0) - return IRQ_NONE; - - tpm_tis_read32(priv, TPM_INT_STATUS(priv->locality), &interrupt); - return IRQ_HANDLED; -} - -/* Register the IRQ and issue a command that will cause an interrupt. If an - * irq is seen then leave the chip setup for IRQ operation, otherwise reverse - * everything and leave in polling mode. Returns 0 on success. - */ -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); - 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) { - dev_info(&chip->dev, "Unable to request irq: %d for probe\n", - irq); - return -1; - } - priv->irq = irq; - - rc = tpm_tis_read8(priv, TPM_INT_VECTOR(priv->locality), - &original_int_vec); - if (rc < 0) - return rc; - - rc = tpm_tis_write8(priv, TPM_INT_VECTOR(priv->locality), irq); - if (rc < 0) - return rc; - - rc = tpm_tis_read32(priv, TPM_INT_STATUS(priv->locality), &int_status); - if (rc < 0) - return rc; - - /* Clear all existing */ - rc = tpm_tis_write32(priv, TPM_INT_STATUS(priv->locality), int_status); - if (rc < 0) - return rc; - - /* Turn on */ - rc = tpm_tis_write32(priv, TPM_INT_ENABLE(priv->locality), - intmask | TPM_GLOBAL_INT_ENABLE); - if (rc < 0) - return rc; - - priv->irq_tested = false; - - /* Generate an interrupt by having the core call through to - * tpm_tis_send - */ - if (chip->flags & TPM_CHIP_FLAG_TPM2) - tpm2_gen_interrupt(chip); - else - tpm_gen_interrupt(chip); - - /* tpm_tis_send will either confirm the interrupt is working or it - * will call disable_irq which undoes all of the above. - */ - if (!(chip->flags & TPM_CHIP_FLAG_IRQ)) { - rc = tpm_tis_write8(priv, TPM_INT_VECTOR(priv->locality), - original_int_vec); - if (rc < 0) - return rc; - - return 1; - } - - return 0; -} - -/* Try to find the IRQ the TPM is using. This is for legacy x86 systems that - * do not have ACPI/etc. We typically expect the interrupt to be declared if - * present. - */ -static void tpm_tis_probe_irq(struct tpm_chip *chip, u32 intmask) -{ - struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); - u8 original_int_vec; - int i, rc; - - rc = tpm_tis_read8(priv, TPM_INT_VECTOR(priv->locality), - &original_int_vec); - if (rc < 0) - return; - - if (!original_int_vec) { - if (IS_ENABLED(CONFIG_X86)) - for (i = 3; i <= 15; i++) - if (!tpm_tis_probe_irq_single(chip, intmask, 0, - i)) - return; - } else if (!tpm_tis_probe_irq_single(chip, intmask, 0, - original_int_vec)) - return; -} - -static bool interrupts = true; -module_param(interrupts, bool, 0444); -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); - u32 reg = TPM_INT_ENABLE(priv->locality); - u32 interrupt; - int rc; - - rc = tpm_tis_read32(priv, reg, &interrupt); - if (rc < 0) - interrupt = 0; - - tpm_tis_write32(priv, reg, ~TPM_GLOBAL_INT_ENABLE & interrupt); - release_locality(chip, priv->locality, 1); -} - 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; + int irq = -1; phy = devm_kzalloc(dev, sizeof(struct tpm_tis_tcg_phy), GFP_KERNEL); if (phy == NULL) return -ENOMEM; - chip = tpmm_chip_alloc(dev, &tpm_tis); - if (IS_ERR(chip)) - return PTR_ERR(chip); - -#ifdef CONFIG_ACPI - chip->acpi_dev_handle = acpi_dev_handle; -#endif - phy->iobase = devm_ioremap_resource(dev, &tpm_info->res); 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; - chip->timeout_c = TIS_TIMEOUT_C_MAX; - chip->timeout_d = TIS_TIMEOUT_D_MAX; - - dev_set_drvdata(&chip->dev, &phy->priv); - - if (wait_startup(chip, 0) != 0) { - rc = -ENODEV; - goto out_err; - } - - /* Take control of the TPM's interrupt hardware and shut it off */ - rc = tpm_tis_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; - tpm_tis_write32(&phy->priv, TPM_INT_ENABLE(phy->priv.locality), - intmask); - - if (request_locality(chip, 0) != 0) { - rc = -ENODEV; - goto out_err; - } - - rc = tpm2_probe(chip); - if (rc) - goto out_err; - - rc = tpm_tis_read32(&phy->priv, TPM_DID_VID(0), &vendor); - if (rc < 0) - goto out_err; - - phy->priv.manufacturer_id = vendor; - - rc = tpm_tis_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, rid); - - if (!itpm) { - probe = probe_itpm(chip); - if (probe < 0) { - rc = -ENODEV; - goto out_err; - } - itpm = !!probe; - } + if (interrupts) + irq = tpm_info->irq; if (itpm) - dev_info(dev, "Intel iTPM workaround enabled\n"); - - /* Figure out the capabilities */ - rc = tpm_tis_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) - dev_dbg(dev, "\tBurst Count Static\n"); - if (intfcaps & TPM_INTF_CMD_READY_INT) - dev_dbg(dev, "\tCommand Ready Int Support\n"); - if (intfcaps & TPM_INTF_INT_EDGE_FALLING) - dev_dbg(dev, "\tInterrupt Edge Falling\n"); - if (intfcaps & TPM_INTF_INT_EDGE_RISING) - dev_dbg(dev, "\tInterrupt Edge Rising\n"); - if (intfcaps & TPM_INTF_INT_LEVEL_LOW) - dev_dbg(dev, "\tInterrupt Level Low\n"); - if (intfcaps & TPM_INTF_INT_LEVEL_HIGH) - dev_dbg(dev, "\tInterrupt Level High\n"); - if (intfcaps & TPM_INTF_LOCALITY_CHANGE_INT) - dev_dbg(dev, "\tLocality Change Int Support\n"); - if (intfcaps & TPM_INTF_STS_VALID_INT) - dev_dbg(dev, "\tSts Valid Int Support\n"); - if (intfcaps & TPM_INTF_DATA_AVAIL_INT) - dev_dbg(dev, "\tData Avail Int Support\n"); - - /* Very early on issue a command to the TPM in polling mode to make - * sure it works. May as well use that command to set the proper - * timeouts for the driver. - */ - if (tpm_get_timeouts(chip)) { - dev_err(dev, "Could not get TPM timeouts and durations\n"); - rc = -ENODEV; - goto out_err; - } + phy->priv.flags |= TPM_TIS_ITPM_POSSIBLE; - /* INTERRUPT Setup */ - init_waitqueue_head(&phy->priv.read_queue); - init_waitqueue_head(&phy->priv.int_queue); - if (interrupts && tpm_info->irq != -1) { - if (tpm_info->irq) { - tpm_tis_probe_irq_single(chip, intmask, IRQF_SHARED, - tpm_info->irq); - if (!(chip->flags & TPM_CHIP_FLAG_IRQ)) - dev_err(&chip->dev, FW_BUG - "TPM interrupt not working, polling instead\n"); - } else - tpm_tis_probe_irq(chip, intmask); - } - - if (chip->flags & TPM_CHIP_FLAG_TPM2) { - rc = tpm2_do_selftest(chip); - if (rc == TPM2_RC_INITIALIZE) { - dev_warn(dev, "Firmware has not started TPM\n"); - rc = tpm2_startup(chip, TPM2_SU_CLEAR); - if (!rc) - rc = tpm2_do_selftest(chip); - } - - if (rc) { - dev_err(dev, "TPM self test failed\n"); - if (rc > 0) - rc = -ENODEV; - goto out_err; - } - } else { - if (tpm_do_selftest(chip)) { - dev_err(dev, "TPM self test failed\n"); - rc = -ENODEV; - goto out_err; - } - } - - return tpm_chip_register(chip); -out_err: - tpm_tis_remove(chip); - return rc; -} - -#ifdef CONFIG_PM_SLEEP -static void tpm_tis_reenable_interrupts(struct tpm_chip *chip) -{ - struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); - u32 intmask; - int rc; - - /* reenable interrupts that device may have lost or - BIOS/firmware may have disabled */ - rc = tpm_tis_write8(priv, TPM_INT_VECTOR(priv->locality), priv->irq); - if (rc < 0) - return; - - rc = tpm_tis_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; - - tpm_tis_write32(priv, TPM_INT_ENABLE(priv->locality), intmask); -} - -static int tpm_tis_resume(struct device *dev) -{ - struct tpm_chip *chip = dev_get_drvdata(dev); - int ret; - - if (chip->flags & TPM_CHIP_FLAG_IRQ) - tpm_tis_reenable_interrupts(chip); - - ret = tpm_pm_resume(dev); - if (ret) - return ret; - - /* TPM 1.2 requires self-test on resume. This function actually returns - * an error code but for unknown reason it isn't handled. - */ - if (!(chip->flags & TPM_CHIP_FLAG_TPM2)) - tpm_do_selftest(chip); - - return 0; + return tpm_tis_core_init(dev, &phy->priv, irq, &tpm_tcg, + acpi_dev_handle); } -#endif static SIMPLE_DEV_PM_OPS(tpm_tis_pm, tpm_pm_suspend, tpm_tis_resume); @@ -1219,12 +363,6 @@ static struct platform_driver tis_drv = { }, }; -static bool force; -#ifdef CONFIG_X86 -module_param(force, bool, 0444); -MODULE_PARM_DESC(force, "Force device probe rather than using ACPI entry"); -#endif - static int tpm_tis_force_device(void) { struct platform_device *pdev; |