diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2013-02-21 16:18:12 (GMT) |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-02-21 16:18:12 (GMT) |
commit | 33673dcb372b5d8179c22127ca71deb5f3dc7016 (patch) | |
tree | d182e9dc6aa127375a92b5eb619d6cd2ddc23ce7 /drivers | |
parent | fe9453a1dcb5fb146f9653267e78f4a558066f6f (diff) | |
parent | 5b2660326039a32b28766cb4c1a8b1bdcfadc375 (diff) | |
download | linux-33673dcb372b5d8179c22127ca71deb5f3dc7016.tar.xz |
Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security
Pull security subsystem updates from James Morris:
"This is basically a maintenance update for the TPM driver and EVM/IMA"
Fix up conflicts in lib/digsig.c and security/integrity/ima/ima_main.c
* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security: (45 commits)
tpm/ibmvtpm: build only when IBM pseries is configured
ima: digital signature verification using asymmetric keys
ima: rename hash calculation functions
ima: use new crypto_shash API instead of old crypto_hash
ima: add policy support for file system uuid
evm: add file system uuid to EVM hmac
tpm_tis: check pnp_acpi_device return code
char/tpm/tpm_i2c_stm_st33: drop temporary variable for return value
char/tpm/tpm_i2c_stm_st33: remove dead assignment in tpm_st33_i2c_probe
char/tpm/tpm_i2c_stm_st33: Remove __devexit attribute
char/tpm/tpm_i2c_stm_st33: Don't use memcpy for one byte assignment
tpm_i2c_stm_st33: removed unused variables/code
TPM: Wait for TPM_ACCESS tpmRegValidSts to go high at startup
tpm: Fix cancellation of TPM commands (interrupt mode)
tpm: Fix cancellation of TPM commands (polling mode)
tpm: Store TPM vendor ID
TPM: Work around buggy TPMs that block during continue self test
tpm_i2c_stm_st33: fix oops when i2c client is unavailable
char/tpm: Use struct dev_pm_ops for power management
TPM: STMicroelectronics ST33 I2C BUILD STUFF
...
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/char/tpm/Kconfig | 12 | ||||
-rw-r--r-- | drivers/char/tpm/Makefile | 1 | ||||
-rw-r--r-- | drivers/char/tpm/tpm.c | 114 | ||||
-rw-r--r-- | drivers/char/tpm/tpm.h | 52 | ||||
-rw-r--r-- | drivers/char/tpm/tpm_acpi.c | 8 | ||||
-rw-r--r-- | drivers/char/tpm/tpm_atmel.c | 7 | ||||
-rw-r--r-- | drivers/char/tpm/tpm_i2c_infineon.c | 7 | ||||
-rw-r--r-- | drivers/char/tpm/tpm_i2c_stm_st33.c | 887 | ||||
-rw-r--r-- | drivers/char/tpm/tpm_i2c_stm_st33.h | 61 | ||||
-rw-r--r-- | drivers/char/tpm/tpm_ibmvtpm.c | 15 | ||||
-rw-r--r-- | drivers/char/tpm/tpm_nsc.c | 7 | ||||
-rw-r--r-- | drivers/char/tpm/tpm_tis.c | 64 |
12 files changed, 1155 insertions, 80 deletions
diff --git a/drivers/char/tpm/Kconfig b/drivers/char/tpm/Kconfig index 915875e..dbfd564 100644 --- a/drivers/char/tpm/Kconfig +++ b/drivers/char/tpm/Kconfig @@ -75,10 +75,20 @@ config TCG_INFINEON config TCG_IBMVTPM tristate "IBM VTPM Interface" - depends on PPC64 + depends on PPC_PSERIES ---help--- If you have IBM virtual TPM (VTPM) support say Yes and it will be accessible from within Linux. To compile this driver as a module, choose M here; the module will be called tpm_ibmvtpm. +config TCG_ST33_I2C + tristate "STMicroelectronics ST33 I2C TPM" + depends on I2C + depends on GPIOLIB + ---help--- + If you have a TPM security chip from STMicroelectronics working with + an I2C bus say Yes and it will be accessible from within Linux. + To compile this driver as a module, choose M here; the module will be + called tpm_stm_st33_i2c. + endif # TCG_TPM diff --git a/drivers/char/tpm/Makefile b/drivers/char/tpm/Makefile index 5b3fc8b..a3736c9 100644 --- a/drivers/char/tpm/Makefile +++ b/drivers/char/tpm/Makefile @@ -17,3 +17,4 @@ obj-$(CONFIG_TCG_NSC) += tpm_nsc.o obj-$(CONFIG_TCG_ATMEL) += tpm_atmel.o obj-$(CONFIG_TCG_INFINEON) += tpm_infineon.o obj-$(CONFIG_TCG_IBMVTPM) += tpm_ibmvtpm.o +obj-$(CONFIG_TCG_ST33_I2C) += tpm_i2c_stm_st33.o diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c index 93211df..0d2e82f 100644 --- a/drivers/char/tpm/tpm.c +++ b/drivers/char/tpm/tpm.c @@ -40,8 +40,9 @@ enum tpm_duration { }; #define TPM_MAX_ORDINAL 243 -#define TPM_MAX_PROTECTED_ORDINAL 12 -#define TPM_PROTECTED_ORDINAL_MASK 0xFF +#define TSC_MAX_ORDINAL 12 +#define TPM_PROTECTED_COMMAND 0x00 +#define TPM_CONNECTION_COMMAND 0x40 /* * Bug workaround - some TPM's don't flush the most @@ -65,21 +66,6 @@ static DECLARE_BITMAP(dev_mask, TPM_NUM_DEVICES); * values of the SHORT, MEDIUM, and LONG durations are retrieved * from the chip during initialization with a call to tpm_get_timeouts. */ -static const u8 tpm_protected_ordinal_duration[TPM_MAX_PROTECTED_ORDINAL] = { - TPM_UNDEFINED, /* 0 */ - TPM_UNDEFINED, - TPM_UNDEFINED, - TPM_UNDEFINED, - TPM_UNDEFINED, - TPM_UNDEFINED, /* 5 */ - TPM_UNDEFINED, - TPM_UNDEFINED, - TPM_UNDEFINED, - TPM_UNDEFINED, - TPM_SHORT, /* 10 */ - TPM_SHORT, -}; - static const u8 tpm_ordinal_duration[TPM_MAX_ORDINAL] = { TPM_UNDEFINED, /* 0 */ TPM_UNDEFINED, @@ -351,14 +337,11 @@ unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip, { int duration_idx = TPM_UNDEFINED; int duration = 0; + u8 category = (ordinal >> 24) & 0xFF; - if (ordinal < TPM_MAX_ORDINAL) + if ((category == TPM_PROTECTED_COMMAND && ordinal < TPM_MAX_ORDINAL) || + (category == TPM_CONNECTION_COMMAND && ordinal < TSC_MAX_ORDINAL)) duration_idx = tpm_ordinal_duration[ordinal]; - else if ((ordinal & TPM_PROTECTED_ORDINAL_MASK) < - TPM_MAX_PROTECTED_ORDINAL) - duration_idx = - tpm_protected_ordinal_duration[ordinal & - TPM_PROTECTED_ORDINAL_MASK]; if (duration_idx != TPM_UNDEFINED) duration = chip->vendor.duration[duration_idx]; @@ -410,7 +393,7 @@ static ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf, chip->vendor.req_complete_val) goto out_recv; - if ((status == chip->vendor.req_canceled)) { + if (chip->vendor.req_canceled(chip, status)) { dev_err(chip->dev, "Operation Canceled\n"); rc = -ECANCELED; goto out; @@ -468,7 +451,7 @@ static ssize_t transmit_cmd(struct tpm_chip *chip, struct tpm_cmd_t *cmd, return -EFAULT; err = be32_to_cpu(cmd->header.out.return_code); - if (err != 0) + if (err != 0 && desc) dev_err(chip->dev, "A TPM error (%d) occurred %s\n", err, desc); return err; @@ -528,6 +511,25 @@ void tpm_gen_interrupt(struct tpm_chip *chip) } EXPORT_SYMBOL_GPL(tpm_gen_interrupt); +#define TPM_ORD_STARTUP cpu_to_be32(153) +#define TPM_ST_CLEAR cpu_to_be16(1) +#define TPM_ST_STATE cpu_to_be16(2) +#define TPM_ST_DEACTIVATED cpu_to_be16(3) +static const struct tpm_input_header tpm_startup_header = { + .tag = TPM_TAG_RQU_COMMAND, + .length = cpu_to_be32(12), + .ordinal = TPM_ORD_STARTUP +}; + +static int tpm_startup(struct tpm_chip *chip, __be16 startup_type) +{ + struct tpm_cmd_t start_cmd; + start_cmd.header.in = tpm_startup_header; + start_cmd.params.startup_in.startup_type = startup_type; + return transmit_cmd(chip, &start_cmd, TPM_INTERNAL_RESULT_SIZE, + "attempting to start the TPM"); +} + int tpm_get_timeouts(struct tpm_chip *chip) { struct tpm_cmd_t tpm_cmd; @@ -541,11 +543,28 @@ int tpm_get_timeouts(struct tpm_chip *chip) tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP; tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4); tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT; + rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, NULL); - rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, - "attempting to determine the timeouts"); - if (rc) + if (rc == TPM_ERR_INVALID_POSTINIT) { + /* The TPM is not started, we are the first to talk to it. + Execute a startup command. */ + dev_info(chip->dev, "Issuing TPM_STARTUP"); + if (tpm_startup(chip, TPM_ST_CLEAR)) + return rc; + + tpm_cmd.header.in = tpm_getcap_header; + tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP; + tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4); + tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT; + rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, + NULL); + } + if (rc) { + dev_err(chip->dev, + "A TPM error (%zd) occurred attempting to determine the timeouts\n", + rc); goto duration; + } if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 || be32_to_cpu(tpm_cmd.header.out.length) @@ -824,7 +843,7 @@ int tpm_do_selftest(struct tpm_chip *chip) { int rc; unsigned int loops; - unsigned int delay_msec = 1000; + unsigned int delay_msec = 100; unsigned long duration; struct tpm_cmd_t cmd; @@ -845,6 +864,14 @@ int tpm_do_selftest(struct tpm_chip *chip) cmd.header.in = pcrread_header; cmd.params.pcrread_in.pcr_idx = cpu_to_be32(0); rc = tpm_transmit(chip, (u8 *) &cmd, READ_PCR_RESULT_SIZE); + /* Some buggy TPMs will not respond to tpm_tis_ready() for + * around 300ms while the self test is ongoing, keep trying + * until the self test duration expires. */ + if (rc == -ETIME) { + dev_info(chip->dev, HW_ERR "TPM command timed out during continue self test"); + msleep(delay_msec); + continue; + } if (rc < TPM_HEADER_SIZE) return -EFAULT; @@ -1075,12 +1102,28 @@ ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr, } EXPORT_SYMBOL_GPL(tpm_store_cancel); +static bool wait_for_tpm_stat_cond(struct tpm_chip *chip, u8 mask, bool check_cancel, + bool *canceled) +{ + u8 status = chip->vendor.status(chip); + + *canceled = false; + if ((status & mask) == mask) + return true; + if (check_cancel && chip->vendor.req_canceled(chip, status)) { + *canceled = true; + return true; + } + return false; +} + int wait_for_tpm_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout, - wait_queue_head_t *queue) + wait_queue_head_t *queue, bool check_cancel) { unsigned long stop; long rc; u8 status; + bool canceled = false; /* check current status */ status = chip->vendor.status(chip); @@ -1095,11 +1138,14 @@ again: if ((long)timeout <= 0) return -ETIME; rc = wait_event_interruptible_timeout(*queue, - ((chip->vendor.status(chip) - & mask) == mask), - timeout); - if (rc > 0) + wait_for_tpm_stat_cond(chip, mask, check_cancel, + &canceled), + timeout); + if (rc > 0) { + if (canceled) + return -ECANCELED; return 0; + } if (rc == -ERESTARTSYS && freezing(current)) { clear_thread_flag(TIF_SIGPENDING); goto again; diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h index 8ef7649..81b5201 100644 --- a/drivers/char/tpm/tpm.h +++ b/drivers/char/tpm/tpm.h @@ -47,6 +47,7 @@ enum tpm_addr { #define TPM_WARN_DOING_SELFTEST 0x802 #define TPM_ERR_DEACTIVATED 0x6 #define TPM_ERR_DISABLED 0x7 +#define TPM_ERR_INVALID_POSTINIT 38 #define TPM_HEADER_SIZE 10 extern ssize_t tpm_show_pubek(struct device *, struct device_attribute *attr, @@ -77,7 +78,7 @@ struct tpm_chip; struct tpm_vendor_specific { const u8 req_complete_mask; const u8 req_complete_val; - const u8 req_canceled; + bool (*req_canceled)(struct tpm_chip *chip, u8 status); void __iomem *iobase; /* ioremapped address */ unsigned long base; /* TPM base address */ @@ -100,13 +101,19 @@ struct tpm_vendor_specific { bool timeout_adjusted; unsigned long duration[3]; /* jiffies */ bool duration_adjusted; - void *data; + void *priv; wait_queue_head_t read_queue; wait_queue_head_t int_queue; + + u16 manufacturer_id; }; +#define TPM_VPRIV(c) (c)->vendor.priv + #define TPM_VID_INTEL 0x8086 +#define TPM_VID_WINBOND 0x1050 +#define TPM_VID_STM 0x104A struct tpm_chip { struct device *dev; /* Device stuff */ @@ -154,13 +161,13 @@ struct tpm_input_header { __be16 tag; __be32 length; __be32 ordinal; -}__attribute__((packed)); +} __packed; struct tpm_output_header { __be16 tag; __be32 length; __be32 return_code; -}__attribute__((packed)); +} __packed; struct stclear_flags_t { __be16 tag; @@ -169,14 +176,14 @@ struct stclear_flags_t { u8 physicalPresence; u8 physicalPresenceLock; u8 bGlobalLock; -}__attribute__((packed)); +} __packed; struct tpm_version_t { u8 Major; u8 Minor; u8 revMajor; u8 revMinor; -}__attribute__((packed)); +} __packed; struct tpm_version_1_2_t { __be16 tag; @@ -184,20 +191,20 @@ struct tpm_version_1_2_t { u8 Minor; u8 revMajor; u8 revMinor; -}__attribute__((packed)); +} __packed; struct timeout_t { __be32 a; __be32 b; __be32 c; __be32 d; -}__attribute__((packed)); +} __packed; struct duration_t { __be32 tpm_short; __be32 tpm_medium; __be32 tpm_long; -}__attribute__((packed)); +} __packed; struct permanent_flags_t { __be16 tag; @@ -221,7 +228,7 @@ struct permanent_flags_t { u8 tpmEstablished; u8 maintenanceDone; u8 disableFullDALogicInfo; -}__attribute__((packed)); +} __packed; typedef union { struct permanent_flags_t perm_flags; @@ -239,12 +246,12 @@ struct tpm_getcap_params_in { __be32 cap; __be32 subcap_size; __be32 subcap; -}__attribute__((packed)); +} __packed; struct tpm_getcap_params_out { __be32 cap_size; cap_t cap; -}__attribute__((packed)); +} __packed; struct tpm_readpubek_params_out { u8 algorithm[4]; @@ -255,7 +262,7 @@ struct tpm_readpubek_params_out { __be32 keysize; u8 modulus[256]; u8 checksum[20]; -}__attribute__((packed)); +} __packed; typedef union { struct tpm_input_header in; @@ -265,16 +272,16 @@ typedef union { #define TPM_DIGEST_SIZE 20 struct tpm_pcrread_out { u8 pcr_result[TPM_DIGEST_SIZE]; -}__attribute__((packed)); +} __packed; struct tpm_pcrread_in { __be32 pcr_idx; -}__attribute__((packed)); +} __packed; struct tpm_pcrextend_in { __be32 pcr_idx; u8 hash[TPM_DIGEST_SIZE]; -}__attribute__((packed)); +} __packed; /* 128 bytes is an arbitrary cap. This could be as large as TPM_BUFSIZE - 18 * bytes, but 128 is still a relatively large number of random bytes and @@ -285,11 +292,15 @@ struct tpm_pcrextend_in { struct tpm_getrandom_out { __be32 rng_data_len; u8 rng_data[TPM_MAX_RNG_DATA]; -}__attribute__((packed)); +} __packed; struct tpm_getrandom_in { __be32 num_bytes; -}__attribute__((packed)); +} __packed; + +struct tpm_startup_in { + __be16 startup_type; +} __packed; typedef union { struct tpm_getcap_params_out getcap_out; @@ -301,12 +312,13 @@ typedef union { struct tpm_pcrextend_in pcrextend_in; struct tpm_getrandom_in getrandom_in; struct tpm_getrandom_out getrandom_out; + struct tpm_startup_in startup_in; } tpm_cmd_params; struct tpm_cmd_t { tpm_cmd_header header; tpm_cmd_params params; -}__attribute__((packed)); +} __packed; ssize_t tpm_getcap(struct device *, __be32, cap_t *, const char *); @@ -326,7 +338,7 @@ extern void tpm_remove_hardware(struct device *); extern int tpm_pm_suspend(struct device *); extern int tpm_pm_resume(struct device *); extern int wait_for_tpm_stat(struct tpm_chip *, u8, unsigned long, - wait_queue_head_t *); + wait_queue_head_t *, bool); #ifdef CONFIG_ACPI extern int tpm_add_ppi(struct kobject *); diff --git a/drivers/char/tpm/tpm_acpi.c b/drivers/char/tpm/tpm_acpi.c index 56051d0..64420b3 100644 --- a/drivers/char/tpm/tpm_acpi.c +++ b/drivers/char/tpm/tpm_acpi.c @@ -33,13 +33,13 @@ struct acpi_tcpa { u16 platform_class; union { struct client_hdr { - u32 log_max_len __attribute__ ((packed)); - u64 log_start_addr __attribute__ ((packed)); + u32 log_max_len __packed; + u64 log_start_addr __packed; } client; struct server_hdr { u16 reserved; - u64 log_max_len __attribute__ ((packed)); - u64 log_start_addr __attribute__ ((packed)); + u64 log_max_len __packed; + u64 log_start_addr __packed; } server; }; }; diff --git a/drivers/char/tpm/tpm_atmel.c b/drivers/char/tpm/tpm_atmel.c index 678d570..99d6820 100644 --- a/drivers/char/tpm/tpm_atmel.c +++ b/drivers/char/tpm/tpm_atmel.c @@ -116,6 +116,11 @@ static u8 tpm_atml_status(struct tpm_chip *chip) return ioread8(chip->vendor.iobase + 1); } +static bool tpm_atml_req_canceled(struct tpm_chip *chip, u8 status) +{ + return (status == ATML_STATUS_READY); +} + static const struct file_operations atmel_ops = { .owner = THIS_MODULE, .llseek = no_llseek, @@ -147,7 +152,7 @@ static const struct tpm_vendor_specific tpm_atmel = { .status = tpm_atml_status, .req_complete_mask = ATML_STATUS_BUSY | ATML_STATUS_DATA_AVAIL, .req_complete_val = ATML_STATUS_DATA_AVAIL, - .req_canceled = ATML_STATUS_READY, + .req_canceled = tpm_atml_req_canceled, .attr_group = &atmel_attr_grp, .miscdev = { .fops = &atmel_ops, }, }; diff --git a/drivers/char/tpm/tpm_i2c_infineon.c b/drivers/char/tpm/tpm_i2c_infineon.c index fb447bd..8fe7ac3 100644 --- a/drivers/char/tpm/tpm_i2c_infineon.c +++ b/drivers/char/tpm/tpm_i2c_infineon.c @@ -505,6 +505,11 @@ out_err: return rc; } +static bool tpm_tis_i2c_req_canceled(struct tpm_chip *chip, u8 status) +{ + return (status == TPM_STS_COMMAND_READY); +} + static const struct file_operations tis_ops = { .owner = THIS_MODULE, .llseek = no_llseek, @@ -550,7 +555,7 @@ static struct tpm_vendor_specific tpm_tis_i2c = { .cancel = tpm_tis_i2c_ready, .req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID, .req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID, - .req_canceled = TPM_STS_COMMAND_READY, + .req_canceled = tpm_tis_i2c_req_canceled, .attr_group = &tis_attr_grp, .miscdev.fops = &tis_ops, }; diff --git a/drivers/char/tpm/tpm_i2c_stm_st33.c b/drivers/char/tpm/tpm_i2c_stm_st33.c new file mode 100644 index 0000000..1f5f71e --- /dev/null +++ b/drivers/char/tpm/tpm_i2c_stm_st33.c @@ -0,0 +1,887 @@ +/* + * STMicroelectronics TPM I2C Linux driver for TPM ST33ZP24 + * Copyright (C) 2009, 2010 STMicroelectronics + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + * + * STMicroelectronics version 1.2.0, Copyright (C) 2010 + * STMicroelectronics comes with ABSOLUTELY NO WARRANTY. + * This is free software, and you are welcome to redistribute it + * under certain conditions. + * + * @Author: Christophe RICARD tpmsupport@st.com + * + * @File: tpm_stm_st33_i2c.c + * + * @Synopsis: + * 09/15/2010: First shot driver tpm_tis driver for + lpc is used as model. + */ + +#include <linux/pci.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/i2c.h> +#include <linux/fs.h> +#include <linux/miscdevice.h> +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/delay.h> +#include <linux/init.h> +#include <linux/wait.h> +#include <linux/string.h> +#include <linux/interrupt.h> +#include <linux/spinlock.h> +#include <linux/sysfs.h> +#include <linux/gpio.h> +#include <linux/sched.h> +#include <linux/uaccess.h> +#include <linux/io.h> +#include <linux/slab.h> +#include <linux/sched.h> + +#include "tpm.h" +#include "tpm_i2c_stm_st33.h" + +enum stm33zp24_access { + TPM_ACCESS_VALID = 0x80, + TPM_ACCESS_ACTIVE_LOCALITY = 0x20, + TPM_ACCESS_REQUEST_PENDING = 0x04, + TPM_ACCESS_REQUEST_USE = 0x02, +}; + +enum stm33zp24_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 stm33zp24_int_flags { + TPM_GLOBAL_INT_ENABLE = 0x80, + TPM_INTF_CMD_READY_INT = 0x080, + TPM_INTF_FIFO_AVALAIBLE_INT = 0x040, + TPM_INTF_WAKE_UP_READY_INT = 0x020, + TPM_INTF_LOCALITY_CHANGE_INT = 0x004, + TPM_INTF_STS_VALID_INT = 0x002, + TPM_INTF_DATA_AVAIL_INT = 0x001, +}; + +enum tis_defaults { + TIS_SHORT_TIMEOUT = 750, + TIS_LONG_TIMEOUT = 2000, +}; + +/* + * write8_reg + * Send byte to the TIS register according to the ST33ZP24 I2C protocol. + * @param: tpm_register, the tpm tis register where the data should be written + * @param: tpm_data, the tpm_data to write inside the tpm_register + * @param: tpm_size, The length of the data + * @return: Returns negative errno, or else the number of bytes written. + */ +static int write8_reg(struct i2c_client *client, u8 tpm_register, + u8 *tpm_data, u16 tpm_size) +{ + struct st33zp24_platform_data *pin_infos; + + pin_infos = client->dev.platform_data; + + pin_infos->tpm_i2c_buffer[0][0] = tpm_register; + memcpy(&pin_infos->tpm_i2c_buffer[0][1], tpm_data, tpm_size); + return i2c_master_send(client, pin_infos->tpm_i2c_buffer[0], + tpm_size + 1); +} /* write8_reg() */ + +/* + * read8_reg + * Recv byte from the TIS register according to the ST33ZP24 I2C protocol. + * @param: tpm_register, the tpm tis register where the data should be read + * @param: tpm_data, the TPM response + * @param: tpm_size, tpm TPM response size to read. + * @return: number of byte read successfully: should be one if success. + */ +static int read8_reg(struct i2c_client *client, u8 tpm_register, + u8 *tpm_data, int tpm_size) +{ + u8 status = 0; + u8 data; + + data = TPM_DUMMY_BYTE; + status = write8_reg(client, tpm_register, &data, 1); + if (status == 2) + status = i2c_master_recv(client, tpm_data, tpm_size); + return status; +} /* read8_reg() */ + +/* + * I2C_WRITE_DATA + * Send byte to the TIS register according to the ST33ZP24 I2C protocol. + * @param: client, the chip description + * @param: tpm_register, the tpm tis register where the data should be written + * @param: tpm_data, the tpm_data to write inside the tpm_register + * @param: tpm_size, The length of the data + * @return: number of byte written successfully: should be one if success. + */ +#define I2C_WRITE_DATA(client, tpm_register, tpm_data, tpm_size) \ + (write8_reg(client, tpm_register | \ + TPM_WRITE_DIRECTION, tpm_data, tpm_size)) + +/* + * I2C_READ_DATA + * Recv byte from the TIS register according to the ST33ZP24 I2C protocol. + * @param: tpm, the chip description + * @param: tpm_register, the tpm tis register where the data should be read + * @param: tpm_data, the TPM response + * @param: tpm_size, tpm TPM response size to read. + * @return: number of byte read successfully: should be one if success. + */ +#define I2C_READ_DATA(client, tpm_register, tpm_data, tpm_size) \ + (read8_reg(client, tpm_register, tpm_data, tpm_size)) + +/* + * clear_interruption + * clear the TPM interrupt register. + * @param: tpm, the chip description + */ +static void clear_interruption(struct i2c_client *client) +{ + u8 interrupt; + I2C_READ_DATA(client, TPM_INT_STATUS, &interrupt, 1); + I2C_WRITE_DATA(client, TPM_INT_STATUS, &interrupt, 1); + I2C_READ_DATA(client, TPM_INT_STATUS, &interrupt, 1); +} /* clear_interruption() */ + +/* + * _wait_for_interrupt_serirq_timeout + * @param: tpm, the chip description + * @param: timeout, the timeout of the interrupt + * @return: the status of the interruption. + */ +static long _wait_for_interrupt_serirq_timeout(struct tpm_chip *chip, + unsigned long timeout) +{ + long status; + struct i2c_client *client; + struct st33zp24_platform_data *pin_infos; + + client = (struct i2c_client *) TPM_VPRIV(chip); + pin_infos = client->dev.platform_data; + + status = wait_for_completion_interruptible_timeout( + &pin_infos->irq_detection, + timeout); + if (status > 0) + enable_irq(gpio_to_irq(pin_infos->io_serirq)); + gpio_direction_input(pin_infos->io_serirq); + + return status; +} /* wait_for_interrupt_serirq_timeout() */ + +static int wait_for_serirq_timeout(struct tpm_chip *chip, bool condition, + unsigned long timeout) +{ + int status = 2; + struct i2c_client *client; + + client = (struct i2c_client *) TPM_VPRIV(chip); + + status = _wait_for_interrupt_serirq_timeout(chip, timeout); + if (!status) { + status = -EBUSY; + } else{ + clear_interruption(client); + if (condition) + status = 1; + } + return status; +} + +/* + * tpm_stm_i2c_cancel, cancel is not implemented. + * @param: chip, the tpm_chip description as specified in driver/char/tpm/tpm.h + */ +static void tpm_stm_i2c_cancel(struct tpm_chip *chip) +{ + struct i2c_client *client; + u8 data; + + client = (struct i2c_client *) TPM_VPRIV(chip); + + data = TPM_STS_COMMAND_READY; + I2C_WRITE_DATA(client, TPM_STS, &data, 1); + if (chip->vendor.irq) + wait_for_serirq_timeout(chip, 1, chip->vendor.timeout_a); +} /* tpm_stm_i2c_cancel() */ + +/* + * tpm_stm_spi_status return the TPM_STS register + * @param: chip, the tpm chip description + * @return: the TPM_STS register value. + */ +static u8 tpm_stm_i2c_status(struct tpm_chip *chip) +{ + struct i2c_client *client; + u8 data; + client = (struct i2c_client *) TPM_VPRIV(chip); + + I2C_READ_DATA(client, TPM_STS, &data, 1); + return data; +} /* tpm_stm_i2c_status() */ + + +/* + * check_locality if the locality is active + * @param: chip, the tpm chip description + * @return: the active locality or -EACCESS. + */ +static int check_locality(struct tpm_chip *chip) +{ + struct i2c_client *client; + u8 data; + u8 status; + + client = (struct i2c_client *) TPM_VPRIV(chip); + + status = I2C_READ_DATA(client, TPM_ACCESS, &data, 1); + if (status && (data & + (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) == + (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) + return chip->vendor.locality; + + return -EACCES; + +} /* check_locality() */ + +/* + * request_locality request the TPM locality + * @param: chip, the chip description + * @return: the active locality or EACCESS. + */ +static int request_locality(struct tpm_chip *chip) +{ + unsigned long stop; + long rc; + struct i2c_client *client; + u8 data; + + client = (struct i2c_client *) TPM_VPRIV(chip); + + if (check_locality(chip) == chip->vendor.locality) + return chip->vendor.locality; + + data = TPM_ACCESS_REQUEST_USE; + rc = I2C_WRITE_DATA(client, TPM_ACCESS, &data, 1); + if (rc < 0) + goto end; + + if (chip->vendor.irq) { + rc = wait_for_serirq_timeout(chip, (check_locality + (chip) >= 0), + chip->vendor.timeout_a); + if (rc > 0) + return chip->vendor.locality; + } else{ + stop = jiffies + chip->vendor.timeout_a; + do { + if (check_locality(chip) >= 0) + return chip->vendor.locality; + msleep(TPM_TIMEOUT); + } while (time_before(jiffies, stop)); + } + rc = -EACCES; +end: + return rc; +} /* request_locality() */ + +/* + * release_locality release the active locality + * @param: chip, the tpm chip description. + */ +static void release_locality(struct tpm_chip *chip) +{ + struct i2c_client *client; + u8 data; + + client = (struct i2c_client *) TPM_VPRIV(chip); + data = TPM_ACCESS_ACTIVE_LOCALITY; + + I2C_WRITE_DATA(client, TPM_ACCESS, &data, 1); +} + +/* + * get_burstcount return the burstcount address 0x19 0x1A + * @param: chip, the chip description + * return: the burstcount. + */ +static int get_burstcount(struct tpm_chip *chip) +{ + unsigned long stop; + int burstcnt, status; + u8 tpm_reg, temp; + + struct i2c_client *client = (struct i2c_client *) TPM_VPRIV(chip); + + stop = jiffies + chip->vendor.timeout_d; + do { + tpm_reg = TPM_STS + 1; + status = I2C_READ_DATA(client, tpm_reg, &temp, 1); + if (status < 0) + goto end; + + tpm_reg = tpm_reg + 1; + burstcnt = temp; + status = I2C_READ_DATA(client, tpm_reg, &temp, 1); + if (status < 0) + goto end; + + burstcnt |= temp << 8; + if (burstcnt) + return burstcnt; + msleep(TPM_TIMEOUT); + } while (time_before(jiffies, stop)); + +end: + return -EBUSY; +} /* get_burstcount() */ + +/* + * wait_for_stat wait for a TPM_STS value + * @param: chip, the tpm chip description + * @param: mask, the value mask to wait + * @param: timeout, the timeout + * @param: queue, the wait queue. + * @return: the tpm status, 0 if success, -ETIME if timeout is reached. + */ +static int wait_for_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout, + wait_queue_head_t *queue) +{ + unsigned long stop; + long rc; + u8 status; + + if (chip->vendor.irq) { + rc = wait_for_serirq_timeout(chip, ((tpm_stm_i2c_status + (chip) & mask) == + mask), timeout); + if (rc > 0) + return 0; + } else{ + stop = jiffies + timeout; + do { + msleep(TPM_TIMEOUT); + status = tpm_stm_i2c_status(chip); + if ((status & mask) == mask) + return 0; + } while (time_before(jiffies, stop)); + } + return -ETIME; +} /* wait_for_stat() */ + +/* + * recv_data receive data + * @param: chip, the tpm chip description + * @param: buf, the buffer where the data are received + * @param: count, the number of data to receive + * @return: the number of bytes read from TPM FIFO. + */ +static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count) +{ + int size = 0, burstcnt, len; + struct i2c_client *client; + + client = (struct i2c_client *) TPM_VPRIV(chip); + + while (size < count && + wait_for_stat(chip, + TPM_STS_DATA_AVAIL | TPM_STS_VALID, + chip->vendor.timeout_c, + &chip->vendor.read_queue) + == 0) { + burstcnt = get_burstcount(chip); + len = min_t(int, burstcnt, count - size); + I2C_READ_DATA(client, TPM_DATA_FIFO, buf + size, len); + size += len; + } + return size; +} + +/* + * tpm_ioserirq_handler the serirq irq handler + * @param: irq, the tpm chip description + * @param: dev_id, the description of the chip + * @return: the status of the handler. + */ +static irqreturn_t tpm_ioserirq_handler(int irq, void *dev_id) +{ + struct tpm_chip *chip = dev_id; + struct i2c_client *client; + struct st33zp24_platform_data *pin_infos; + + disable_irq_nosync(irq); + + client = (struct i2c_client *) TPM_VPRIV(chip); + pin_infos = client->dev.platform_data; + + complete(&pin_infos->irq_detection); + return IRQ_HANDLED; +} /* tpm_ioserirq_handler() */ + + +/* + * tpm_stm_i2c_send send TPM commands through the I2C bus. + * + * @param: chip, the tpm_chip description as specified in driver/char/tpm/tpm.h + * @param: buf, the buffer to send. + * @param: count, the number of bytes to send. + * @return: In case of success the number of bytes sent. + * In other case, a < 0 value describing the issue. + */ +static int tpm_stm_i2c_send(struct tpm_chip *chip, unsigned char *buf, + size_t len) +{ + u32 status, + burstcnt = 0, i, size; + int ret; + u8 data; + struct i2c_client *client; + + if (chip == NULL) + return -EBUSY; + if (len < TPM_HEADER_SIZE) + return -EBUSY; + + client = (struct i2c_client *)TPM_VPRIV(chip); + + client->flags = 0; + + ret = request_locality(chip); + if (ret < 0) + return ret; + + status = tpm_stm_i2c_status(chip); + if ((status & TPM_STS_COMMAND_READY) == 0) { + tpm_stm_i2c_cancel(chip); + if (wait_for_stat + (chip, TPM_STS_COMMAND_READY, chip->vendor.timeout_b, + &chip->vendor.int_queue) < 0) { + ret = -ETIME; + goto out_err; + } + } + + for (i = 0 ; i < len - 1 ;) { + burstcnt = get_burstcount(chip); + size = min_t(int, len - i - 1, burstcnt); + ret = I2C_WRITE_DATA(client, TPM_DATA_FIFO, buf, size); + if (ret < 0) + goto out_err; + + i += size; + } + + status = tpm_stm_i2c_status(chip); + if ((status & TPM_STS_DATA_EXPECT) == 0) { + ret = -EIO; + goto out_err; + } + + ret = I2C_WRITE_DATA(client, TPM_DATA_FIFO, buf + len - 1, 1); + if (ret < 0) + goto out_err; + + status = tpm_stm_i2c_status(chip); + if ((status & TPM_STS_DATA_EXPECT) != 0) { + ret = -EIO; + goto out_err; + } + + data = TPM_STS_GO; + I2C_WRITE_DATA(client, TPM_STS, &data, 1); + + return len; +out_err: + tpm_stm_i2c_cancel(chip); + release_locality(chip); + return ret; +} + +/* + * tpm_stm_i2c_recv received TPM response through the I2C bus. + * @param: chip, the tpm_chip description as specified in driver/char/tpm/tpm.h. + * @param: buf, the buffer to store datas. + * @param: count, the number of bytes to send. + * @return: In case of success the number of bytes received. + * In other case, a < 0 value describing the issue. + */ +static int tpm_stm_i2c_recv(struct tpm_chip *chip, unsigned char *buf, + size_t count) +{ + int size = 0; + int expected; + + if (chip == NULL) + return -EBUSY; + + if (count < TPM_HEADER_SIZE) { + size = -EIO; + goto out; + } + + size = recv_data(chip, buf, TPM_HEADER_SIZE); + if (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; + } + + size += recv_data(chip, &buf[TPM_HEADER_SIZE], + expected - TPM_HEADER_SIZE); + if (size < expected) { + dev_err(chip->dev, "Unable to read remainder of result\n"); + size = -ETIME; + goto out; + } + +out: + chip->vendor.cancel(chip); + release_locality(chip); + return size; +} + +static bool tpm_st33_i2c_req_canceled(struct tpm_chip *chip, u8 status) +{ + return (status == TPM_STS_COMMAND_READY); +} + +static const struct file_operations tpm_st33_i2c_fops = { + .owner = THIS_MODULE, + .llseek = no_llseek, + .read = tpm_read, + .write = tpm_write, + .open = tpm_open, + .release = tpm_release, +}; + +static DEVICE_ATTR(pubek, S_IRUGO, tpm_show_pubek, NULL); +static DEVICE_ATTR(pcrs, S_IRUGO, tpm_show_pcrs, NULL); +static DEVICE_ATTR(enabled, S_IRUGO, tpm_show_enabled, NULL); +static DEVICE_ATTR(active, S_IRUGO, tpm_show_active, NULL); +static DEVICE_ATTR(owned, S_IRUGO, tpm_show_owned, NULL); +static DEVICE_ATTR(temp_deactivated, S_IRUGO, tpm_show_temp_deactivated, NULL); +static DEVICE_ATTR(caps, S_IRUGO, tpm_show_caps_1_2, NULL); +static DEVICE_ATTR(cancel, S_IWUSR | S_IWGRP, NULL, tpm_store_cancel); + +static struct attribute *stm_tpm_attrs[] = { + &dev_attr_pubek.attr, + &dev_attr_pcrs.attr, + &dev_attr_enabled.attr, + &dev_attr_active.attr, + &dev_attr_owned.attr, + &dev_attr_temp_deactivated.attr, + &dev_attr_caps.attr, + &dev_attr_cancel.attr, NULL, +}; + +static struct attribute_group stm_tpm_attr_grp = { + .attrs = stm_tpm_attrs +}; + +static struct tpm_vendor_specific st_i2c_tpm = { + .send = tpm_stm_i2c_send, + .recv = tpm_stm_i2c_recv, + .cancel = tpm_stm_i2c_cancel, + .status = tpm_stm_i2c_status, + .req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID, + .req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID, + .req_canceled = tpm_st33_i2c_req_canceled, + .attr_group = &stm_tpm_attr_grp, + .miscdev = {.fops = &tpm_st33_i2c_fops,}, +}; + +static int interrupts ; +module_param(interrupts, int, 0444); +MODULE_PARM_DESC(interrupts, "Enable interrupts"); + +static int power_mgt = 1; +module_param(power_mgt, int, 0444); +MODULE_PARM_DESC(power_mgt, "Power Management"); + +/* + * tpm_st33_i2c_probe initialize the TPM device + * @param: client, the i2c_client drescription (TPM I2C description). + * @param: id, the i2c_device_id struct. + * @return: 0 in case of success. + * -1 in other case. + */ +static int +tpm_st33_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id) +{ + int err; + u8 intmask; + struct tpm_chip *chip; + struct st33zp24_platform_data *platform_data; + + if (client == NULL) { + pr_info("%s: i2c client is NULL. Device not accessible.\n", + __func__); + err = -ENODEV; + goto end; + } + + if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { + dev_info(&client->dev, "client not i2c capable\n"); + err = -ENODEV; + goto end; + } + + chip = tpm_register_hardware(&client->dev, &st_i2c_tpm); + if (!chip) { + dev_info(&client->dev, "fail chip\n"); + err = -ENODEV; + goto end; + } + + platform_data = client->dev.platform_data; + + if (!platform_data) { + dev_info(&client->dev, "chip not available\n"); + err = -ENODEV; + goto _tpm_clean_answer; + } + + platform_data->tpm_i2c_buffer[0] = + kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL); + if (platform_data->tpm_i2c_buffer[0] == NULL) { + err = -ENOMEM; + goto _tpm_clean_answer; + } + platform_data->tpm_i2c_buffer[1] = + kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL); + if (platform_data->tpm_i2c_buffer[1] == NULL) { + err = -ENOMEM; + goto _tpm_clean_response1; + } + + TPM_VPRIV(chip) = client; + + 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); + + chip->vendor.locality = LOCALITY0; + + if (power_mgt) { + err = gpio_request(platform_data->io_lpcpd, "TPM IO_LPCPD"); + if (err) + goto _gpio_init1; + gpio_set_value(platform_data->io_lpcpd, 1); + } + + if (interrupts) { + init_completion(&platform_data->irq_detection); + if (request_locality(chip) != LOCALITY0) { + err = -ENODEV; + goto _tpm_clean_response2; + } + err = gpio_request(platform_data->io_serirq, "TPM IO_SERIRQ"); + if (err) + goto _gpio_init2; + + clear_interruption(client); + err = request_irq(gpio_to_irq(platform_data->io_serirq), + &tpm_ioserirq_handler, + IRQF_TRIGGER_HIGH, + "TPM SERIRQ management", chip); + if (err < 0) { + dev_err(chip->dev , "TPM SERIRQ signals %d not available\n", + gpio_to_irq(platform_data->io_serirq)); + goto _irq_set; + } + + err = I2C_READ_DATA(client, TPM_INT_ENABLE, &intmask, 1); + if (err < 0) + goto _irq_set; + + intmask |= TPM_INTF_CMD_READY_INT + | TPM_INTF_FIFO_AVALAIBLE_INT + | TPM_INTF_WAKE_UP_READY_INT + | TPM_INTF_LOCALITY_CHANGE_INT + | TPM_INTF_STS_VALID_INT + | TPM_INTF_DATA_AVAIL_INT; + + err = I2C_WRITE_DATA(client, TPM_INT_ENABLE, &intmask, 1); + if (err < 0) + goto _irq_set; + + intmask = TPM_GLOBAL_INT_ENABLE; + err = I2C_WRITE_DATA(client, (TPM_INT_ENABLE + 3), &intmask, 1); + if (err < 0) + goto _irq_set; + + err = I2C_READ_DATA(client, TPM_INT_STATUS, &intmask, 1); + if (err < 0) + goto _irq_set; + + chip->vendor.irq = interrupts; + + tpm_gen_interrupt(chip); + } + + tpm_get_timeouts(chip); + + i2c_set_clientdata(client, chip); + + dev_info(chip->dev, "TPM I2C Initialized\n"); + return 0; +_irq_set: + free_irq(gpio_to_irq(platform_data->io_serirq), (void *) chip); +_gpio_init2: + if (interrupts) + gpio_free(platform_data->io_serirq); +_gpio_init1: + if (power_mgt) + gpio_free(platform_data->io_lpcpd); +_tpm_clean_response2: + kzfree(platform_data->tpm_i2c_buffer[1]); + platform_data->tpm_i2c_buffer[1] = NULL; +_tpm_clean_response1: + kzfree(platform_data->tpm_i2c_buffer[0]); + platform_data->tpm_i2c_buffer[0] = NULL; +_tpm_clean_answer: + tpm_remove_hardware(chip->dev); +end: + pr_info("TPM I2C initialisation fail\n"); + return err; +} + +/* + * tpm_st33_i2c_remove remove the TPM device + * @param: client, the i2c_client drescription (TPM I2C description). + clear_bit(0, &chip->is_open); + * @return: 0 in case of success. + */ +static int tpm_st33_i2c_remove(struct i2c_client *client) +{ + struct tpm_chip *chip = (struct tpm_chip *)i2c_get_clientdata(client); + struct st33zp24_platform_data *pin_infos = + ((struct i2c_client *) TPM_VPRIV(chip))->dev.platform_data; + + if (pin_infos != NULL) { + free_irq(pin_infos->io_serirq, chip); + + gpio_free(pin_infos->io_serirq); + gpio_free(pin_infos->io_lpcpd); + + tpm_remove_hardware(chip->dev); + + if (pin_infos->tpm_i2c_buffer[1] != NULL) { + kzfree(pin_infos->tpm_i2c_buffer[1]); + pin_infos->tpm_i2c_buffer[1] = NULL; + } + if (pin_infos->tpm_i2c_buffer[0] != NULL) { + kzfree(pin_infos->tpm_i2c_buffer[0]); + pin_infos->tpm_i2c_buffer[0] = NULL; + } + } + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +/* + * tpm_st33_i2c_pm_suspend suspend the TPM device + * Added: Work around when suspend and no tpm application is running, suspend + * may fail because chip->data_buffer is not set (only set in tpm_open in Linux + * TPM core) + * @param: client, the i2c_client drescription (TPM I2C description). + * @param: mesg, the power management message. + * @return: 0 in case of success. + */ +static int tpm_st33_i2c_pm_suspend(struct device *dev) +{ + struct tpm_chip *chip = dev_get_drvdata(dev); + struct st33zp24_platform_data *pin_infos = dev->platform_data; + int ret = 0; + + if (power_mgt) + gpio_set_value(pin_infos->io_lpcpd, 0); + else{ + if (chip->data_buffer == NULL) + chip->data_buffer = pin_infos->tpm_i2c_buffer[0]; + ret = tpm_pm_suspend(dev); + } + return ret; +} /* tpm_st33_i2c_suspend() */ + +/* + * tpm_st33_i2c_pm_resume resume the TPM device + * @param: client, the i2c_client drescription (TPM I2C description). + * @return: 0 in case of success. + */ +static int tpm_st33_i2c_pm_resume(struct device *dev) +{ + struct tpm_chip *chip = dev_get_drvdata(dev); + struct st33zp24_platform_data *pin_infos = dev->platform_data; + + int ret = 0; + + if (power_mgt) { + gpio_set_value(pin_infos->io_lpcpd, 1); + ret = wait_for_serirq_timeout(chip, + (chip->vendor.status(chip) & + TPM_STS_VALID) == TPM_STS_VALID, + chip->vendor.timeout_b); + } else{ + if (chip->data_buffer == NULL) + chip->data_buffer = pin_infos->tpm_i2c_buffer[0]; + ret = tpm_pm_resume(dev); + if (!ret) + tpm_do_selftest(chip); + } + return ret; +} /* tpm_st33_i2c_pm_resume() */ +#endif + +static const struct i2c_device_id tpm_st33_i2c_id[] = { + {TPM_ST33_I2C, 0}, + {} +}; +MODULE_DEVICE_TABLE(i2c, tpm_st33_i2c_id); +static SIMPLE_DEV_PM_OPS(tpm_st33_i2c_ops, tpm_st33_i2c_pm_suspend, tpm_st33_i2c_pm_resume); +static struct i2c_driver tpm_st33_i2c_driver = { + .driver = { + .owner = THIS_MODULE, + .name = TPM_ST33_I2C, + .pm = &tpm_st33_i2c_ops, + }, + .probe = tpm_st33_i2c_probe, + .remove = tpm_st33_i2c_remove, + .id_table = tpm_st33_i2c_id +}; + +module_i2c_driver(tpm_st33_i2c_driver); + +MODULE_AUTHOR("Christophe Ricard (tpmsupport@st.com)"); +MODULE_DESCRIPTION("STM TPM I2C ST33 Driver"); +MODULE_VERSION("1.2.0"); +MODULE_LICENSE("GPL"); diff --git a/drivers/char/tpm/tpm_i2c_stm_st33.h b/drivers/char/tpm/tpm_i2c_stm_st33.h new file mode 100644 index 0000000..439a432 --- /dev/null +++ b/drivers/char/tpm/tpm_i2c_stm_st33.h @@ -0,0 +1,61 @@ +/* + * STMicroelectronics TPM I2C Linux driver for TPM ST33ZP24 + * Copyright (C) 2009, 2010 STMicroelectronics + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + * + * STMicroelectronics version 1.2.0, Copyright (C) 2010 + * STMicroelectronics comes with ABSOLUTELY NO WARRANTY. + * This is free software, and you are welcome to redistribute it + * under certain conditions. + * + * @Author: Christophe RICARD tpmsupport@st.com + * + * @File: stm_st33_tpm_i2c.h + * + * @Date: 09/15/2010 + */ +#ifndef __STM_ST33_TPM_I2C_MAIN_H__ +#define __STM_ST33_TPM_I2C_MAIN_H__ + +#define TPM_ACCESS (0x0) +#define TPM_STS (0x18) +#define TPM_HASH_END (0x20) +#define TPM_DATA_FIFO (0x24) +#define TPM_HASH_DATA (0x24) +#define TPM_HASH_START (0x28) +#define TPM_INTF_CAPABILITY (0x14) +#define TPM_INT_STATUS (0x10) +#define TPM_INT_ENABLE (0x08) + +#define TPM_DUMMY_BYTE 0xAA +#define TPM_WRITE_DIRECTION 0x80 +#define TPM_HEADER_SIZE 10 +#define TPM_BUFSIZE 2048 + +#define LOCALITY0 0 + +#define TPM_ST33_I2C "st33zp24_i2c" + +struct st33zp24_platform_data { + int io_serirq; + int io_lpcpd; + struct i2c_client *client; + u8 *tpm_i2c_buffer[2]; /* 0 Request 1 Response */ + struct completion irq_detection; + struct mutex lock; +}; + +#endif /* __STM_ST33_TPM_I2C_MAIN_H__ */ diff --git a/drivers/char/tpm/tpm_ibmvtpm.c b/drivers/char/tpm/tpm_ibmvtpm.c index 9978609..56b07c3 100644 --- a/drivers/char/tpm/tpm_ibmvtpm.c +++ b/drivers/char/tpm/tpm_ibmvtpm.c @@ -64,7 +64,7 @@ static struct ibmvtpm_dev *ibmvtpm_get_data(const struct device *dev) { struct tpm_chip *chip = dev_get_drvdata(dev); if (chip) - return (struct ibmvtpm_dev *)chip->vendor.data; + return (struct ibmvtpm_dev *)TPM_VPRIV(chip); return NULL; } @@ -83,7 +83,7 @@ static int tpm_ibmvtpm_recv(struct tpm_chip *chip, u8 *buf, size_t count) u16 len; int sig; - ibmvtpm = (struct ibmvtpm_dev *)chip->vendor.data; + ibmvtpm = (struct ibmvtpm_dev *)TPM_VPRIV(chip); if (!ibmvtpm->rtce_buf) { dev_err(ibmvtpm->dev, "ibmvtpm device is not ready\n"); @@ -127,7 +127,7 @@ static int tpm_ibmvtpm_send(struct tpm_chip *chip, u8 *buf, size_t count) u64 *word = (u64 *) &crq; int rc; - ibmvtpm = (struct ibmvtpm_dev *)chip->vendor.data; + ibmvtpm = (struct ibmvtpm_dev *)TPM_VPRIV(chip); if (!ibmvtpm->rtce_buf) { dev_err(ibmvtpm->dev, "ibmvtpm device is not ready\n"); @@ -398,6 +398,11 @@ static int tpm_ibmvtpm_resume(struct device *dev) return rc; } +static bool tpm_ibmvtpm_req_canceled(struct tpm_chip *chip, u8 status) +{ + return (status == 0); +} + static const struct file_operations ibmvtpm_ops = { .owner = THIS_MODULE, .llseek = no_llseek, @@ -441,7 +446,7 @@ static const struct tpm_vendor_specific tpm_ibmvtpm = { .status = tpm_ibmvtpm_status, .req_complete_mask = 0, .req_complete_val = 0, - .req_canceled = 0, + .req_canceled = tpm_ibmvtpm_req_canceled, .attr_group = &ibmvtpm_attr_grp, .miscdev = { .fops = &ibmvtpm_ops, }, }; @@ -647,7 +652,7 @@ static int tpm_ibmvtpm_probe(struct vio_dev *vio_dev, ibmvtpm->dev = dev; ibmvtpm->vdev = vio_dev; - chip->vendor.data = (void *)ibmvtpm; + TPM_VPRIV(chip) = (void *)ibmvtpm; spin_lock_init(&ibmvtpm->rtce_lock); diff --git a/drivers/char/tpm/tpm_nsc.c b/drivers/char/tpm/tpm_nsc.c index 640c9a4..770c46f 100644 --- a/drivers/char/tpm/tpm_nsc.c +++ b/drivers/char/tpm/tpm_nsc.c @@ -227,6 +227,11 @@ static u8 tpm_nsc_status(struct tpm_chip *chip) return inb(chip->vendor.base + NSC_STATUS); } +static bool tpm_nsc_req_canceled(struct tpm_chip *chip, u8 status) +{ + return (status == NSC_STATUS_RDY); +} + static const struct file_operations nsc_ops = { .owner = THIS_MODULE, .llseek = no_llseek, @@ -258,7 +263,7 @@ static const struct tpm_vendor_specific tpm_nsc = { .status = tpm_nsc_status, .req_complete_mask = NSC_STATUS_OBF, .req_complete_val = NSC_STATUS_OBF, - .req_canceled = NSC_STATUS_RDY, + .req_canceled = tpm_nsc_req_canceled, .attr_group = &nsc_attr_grp, .miscdev = { .fops = &nsc_ops, }, }; diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c index ea31daf..8a41b6b 100644 --- a/drivers/char/tpm/tpm_tis.c +++ b/drivers/char/tpm/tpm_tis.c @@ -84,6 +84,9 @@ static int is_itpm(struct pnp_dev *dev) struct acpi_device *acpi = pnp_acpi_device(dev); struct acpi_hardware_id *id; + if (!acpi) + return 0; + list_for_each_entry(id, &acpi->pnp.ids, list) { if (!strcmp("INTC0102", id->id)) return 1; @@ -98,6 +101,22 @@ static inline int is_itpm(struct pnp_dev *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) +{ + unsigned long stop = jiffies + chip->vendor.timeout_a; + do { + if (ioread8(chip->vendor.iobase + TPM_ACCESS(l)) & + 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) { if ((ioread8(chip->vendor.iobase + TPM_ACCESS(l)) & @@ -198,7 +217,7 @@ static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count) wait_for_tpm_stat(chip, TPM_STS_DATA_AVAIL | TPM_STS_VALID, chip->vendor.timeout_c, - &chip->vendor.read_queue) + &chip->vendor.read_queue, true) == 0) { burstcnt = get_burstcount(chip); for (; burstcnt > 0 && size < count; burstcnt--) @@ -241,7 +260,7 @@ static int tpm_tis_recv(struct tpm_chip *chip, u8 *buf, size_t count) } wait_for_tpm_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c, - &chip->vendor.int_queue); + &chip->vendor.int_queue, false); status = tpm_tis_status(chip); if (status & TPM_STS_DATA_AVAIL) { /* retry? */ dev_err(chip->dev, "Error left over data\n"); @@ -277,7 +296,7 @@ static int tpm_tis_send_data(struct tpm_chip *chip, u8 *buf, size_t len) tpm_tis_ready(chip); if (wait_for_tpm_stat (chip, TPM_STS_COMMAND_READY, chip->vendor.timeout_b, - &chip->vendor.int_queue) < 0) { + &chip->vendor.int_queue, false) < 0) { rc = -ETIME; goto out_err; } @@ -292,7 +311,7 @@ static int tpm_tis_send_data(struct tpm_chip *chip, u8 *buf, size_t len) } wait_for_tpm_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c, - &chip->vendor.int_queue); + &chip->vendor.int_queue, false); status = tpm_tis_status(chip); if (!itpm && (status & TPM_STS_DATA_EXPECT) == 0) { rc = -EIO; @@ -304,7 +323,7 @@ static int tpm_tis_send_data(struct tpm_chip *chip, u8 *buf, size_t len) iowrite8(buf[count], chip->vendor.iobase + TPM_DATA_FIFO(chip->vendor.locality)); wait_for_tpm_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c, - &chip->vendor.int_queue); + &chip->vendor.int_queue, false); status = tpm_tis_status(chip); if ((status & TPM_STS_DATA_EXPECT) != 0) { rc = -EIO; @@ -342,7 +361,7 @@ static int tpm_tis_send(struct tpm_chip *chip, u8 *buf, size_t len) if (wait_for_tpm_stat (chip, TPM_STS_DATA_AVAIL | TPM_STS_VALID, tpm_calc_ordinal_duration(chip, ordinal), - &chip->vendor.read_queue) < 0) { + &chip->vendor.read_queue, false) < 0) { rc = -ETIME; goto out_err; } @@ -374,7 +393,7 @@ static int probe_itpm(struct tpm_chip *chip) if (vendor != TPM_VID_INTEL) return 0; - itpm = 0; + itpm = false; rc = tpm_tis_send_data(chip, cmd_getticks, len); if (rc == 0) @@ -383,7 +402,7 @@ static int probe_itpm(struct tpm_chip *chip) tpm_tis_ready(chip); release_locality(chip, chip->vendor.locality, 0); - itpm = 1; + itpm = true; rc = tpm_tis_send_data(chip, cmd_getticks, len); if (rc == 0) { @@ -400,6 +419,19 @@ out: return rc; } +static bool tpm_tis_req_canceled(struct tpm_chip *chip, u8 status) +{ + switch (chip->vendor.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 file_operations tis_ops = { .owner = THIS_MODULE, .llseek = no_llseek, @@ -445,7 +477,7 @@ static struct tpm_vendor_specific tpm_tis = { .cancel = tpm_tis_ready, .req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID, .req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID, - .req_canceled = TPM_STS_COMMAND_READY, + .req_canceled = tpm_tis_req_canceled, .attr_group = &tis_attr_grp, .miscdev = { .fops = &tis_ops,}, @@ -502,7 +534,7 @@ static irqreturn_t tis_int_handler(int dummy, void *dev_id) return IRQ_HANDLED; } -static bool interrupts = 1; +static bool interrupts = true; module_param(interrupts, bool, 0444); MODULE_PARM_DESC(interrupts, "Enable interrupts"); @@ -528,12 +560,18 @@ static int tpm_tis_init(struct device *dev, resource_size_t start, chip->vendor.timeout_c = msecs_to_jiffies(TIS_SHORT_TIMEOUT); chip->vendor.timeout_d = msecs_to_jiffies(TIS_SHORT_TIMEOUT); + if (wait_startup(chip, 0) != 0) { + rc = -ENODEV; + goto out_err; + } + if (request_locality(chip, 0) != 0) { rc = -ENODEV; goto out_err; } vendor = ioread32(chip->vendor.iobase + TPM_DID_VID(0)); + chip->vendor.manufacturer_id = vendor; dev_info(dev, "1.2 TPM (device-id 0x%X, rev-id %d)\n", @@ -545,7 +583,7 @@ static int tpm_tis_init(struct device *dev, resource_size_t start, rc = -ENODEV; goto out_err; } - itpm = (probe == 0) ? 0 : 1; + itpm = !!probe; } if (itpm) @@ -741,10 +779,10 @@ static int tpm_tis_pnp_init(struct pnp_dev *pnp_dev, if (pnp_irq_valid(pnp_dev, 0)) irq = pnp_irq(pnp_dev, 0); else - interrupts = 0; + interrupts = false; if (is_itpm(pnp_dev)) - itpm = 1; + itpm = true; return tpm_tis_init(&pnp_dev->dev, start, len, irq); } |