diff options
Diffstat (limited to 'src/drivers/spi/tpm')
| -rw-r--r-- | src/drivers/spi/tpm/Kconfig | 7 | ||||
| -rw-r--r-- | src/drivers/spi/tpm/tis.c | 1 | ||||
| -rw-r--r-- | src/drivers/spi/tpm/tpm.c | 102 |
3 files changed, 71 insertions, 39 deletions
diff --git a/src/drivers/spi/tpm/Kconfig b/src/drivers/spi/tpm/Kconfig index be43e2314d..8c39a4a44a 100644 --- a/src/drivers/spi/tpm/Kconfig +++ b/src/drivers/spi/tpm/Kconfig @@ -16,6 +16,13 @@ config DRIVER_TPM_SPI_CHIP config MAINBOARD_HAS_SPI_TPM_CR50 bool default n + select MAINBOARD_HAS_SPI_TPM + help + Board has a CR50 SPI TPM + +config MAINBOARD_HAS_SPI_TPM + bool + default n select SPI_TPM help Board has SPI TPM support diff --git a/src/drivers/spi/tpm/tis.c b/src/drivers/spi/tpm/tis.c index 6230751fb1..60dc705bee 100644 --- a/src/drivers/spi/tpm/tis.c +++ b/src/drivers/spi/tpm/tis.c @@ -18,6 +18,7 @@ static const struct { } dev_map[] = { { 0x15d1, 0x001b, "SLB9670" }, { 0x1ae0, 0x0028, "CR50" }, + { 0x104a, 0x0000, "ST33HTPH2E32" }, }; static const char *tis_get_dev_name(struct tpm2_info *info) diff --git a/src/drivers/spi/tpm/tpm.c b/src/drivers/spi/tpm/tpm.c index 8f93e2a71a..c47aed312c 100644 --- a/src/drivers/spi/tpm/tpm.c +++ b/src/drivers/spi/tpm/tpm.c @@ -104,47 +104,51 @@ static int tpm_sync(void) */ static int start_transaction(int read_write, size_t bytes, unsigned int addr) { - spi_frame_header header; + spi_frame_header header, header_resp; uint8_t byte; int i; + int ret; struct stopwatch sw; static int tpm_sync_needed; static struct stopwatch wake_up_sw; - /* - * First Cr50 access in each coreboot stage where TPM is used will be - * prepended by a wake up pulse on the CS line. - */ - int wakeup_needed = 1; - /* Wait for TPM to finish previous transaction if needed */ - if (tpm_sync_needed) { - tpm_sync(); + if (CONFIG(TPM_CR50)) { /* - * During the first invocation of this function on each stage - * this if () clause code does not run (as tpm_sync_needed - * value is zero), during all following invocations the - * stopwatch below is guaranteed to be started. + * First Cr50 access in each coreboot stage where TPM is used will be + * prepended by a wake up pulse on the CS line. */ - if (!stopwatch_expired(&wake_up_sw)) - wakeup_needed = 0; - } else { - tpm_sync_needed = 1; - } + int wakeup_needed = 1; - if (wakeup_needed) { - /* Just in case Cr50 is asleep. */ - spi_claim_bus(&spi_slave); - udelay(1); - spi_release_bus(&spi_slave); - udelay(100); - } + /* Wait for TPM to finish previous transaction if needed */ + if (tpm_sync_needed) { + tpm_sync(); + /* + * During the first invocation of this function on each stage + * this if () clause code does not run (as tpm_sync_needed + * value is zero), during all following invocations the + * stopwatch below is guaranteed to be started. + */ + if (!stopwatch_expired(&wake_up_sw)) + wakeup_needed = 0; + } else { + tpm_sync_needed = 1; + } - /* - * The Cr50 on H1 does not go to sleep for 1 second after any - * SPI slave activity, let's be conservative and limit the - * window to 900 ms. - */ - stopwatch_init_msecs_expire(&wake_up_sw, 900); + if (wakeup_needed) { + /* Just in case Cr50 is asleep. */ + spi_claim_bus(&spi_slave); + udelay(1); + spi_release_bus(&spi_slave); + udelay(100); + } + + /* + * The Cr50 on H1 does not go to sleep for 1 second after any + * SPI slave activity, let's be conservative and limit the + * window to 900 ms. + */ + stopwatch_init_msecs_expire(&wake_up_sw, 900); + } /* * The first byte of the frame header encodes the transaction type @@ -181,16 +185,30 @@ static int start_transaction(int read_write, size_t bytes, unsigned int addr) * transmitted by the TPM during the transaction's last byte. * * We know that cr50 is guaranteed to set the flow control bit to 0 - * during the header transfer, but real TPM2 might be fast enough not - * to require to stall the master, this would present an issue. + * during the header transfer. Real TPM2 are fast enough to not require + * to stall the master. They might still use this feature, so test the + * last bit after shifting in the address bytes. * crosbug.com/p/52132 has been opened to track this. */ - spi_xfer(&spi_slave, header.body, sizeof(header.body), NULL, 0); + + header_resp.body[3] = 0; + if (CONFIG(TPM_CR50)) + ret = spi_xfer(&spi_slave, header.body, sizeof(header.body), NULL, 0); + else + ret = spi_xfer(&spi_slave, header.body, sizeof(header.body), + header_resp.body, sizeof(header_resp.body)); + if (ret) { + printk(BIOS_ERR, "SPI-TPM: transfer error\n"); + spi_release_bus(&spi_slave); + return 0; + } + + if (header_resp.body[3] & 1) + return 1; /* * Now poll the bus until TPM removes the stall bit. Give it up to 100 - * ms to sort it out - it could be saving stuff in nvram at some - * point. + * ms to sort it out - it could be saving stuff in nvram at some point. */ stopwatch_init_msecs_expire(&sw, 100); do { @@ -201,6 +219,7 @@ static int start_transaction(int read_write, size_t bytes, unsigned int addr) } spi_xfer(&spi_slave, NULL, 0, &byte, 1); } while (!(byte & 1)); + return 1; } @@ -408,7 +427,8 @@ static int tpm2_claim_locality(void) /* Device/vendor ID values of the TPM devices this driver supports. */ static const uint32_t supported_did_vids[] = { - 0x00281ae0 /* H1 based Cr50 security chip. */ + 0x00281ae0, /* H1 based Cr50 security chip. */ + 0x0000104a /* ST33HTPH2E32 */ }; int tpm2_init(struct spi_slave *spi_if) @@ -454,7 +474,8 @@ int tpm2_init(struct spi_slave *spi_if) printk(BIOS_INFO, " done!\n"); - if (ENV_SEPARATE_VERSTAGE || ENV_BOOTBLOCK) + // FIXME: Move this to tpm_setup() + if (ENV_SEPARATE_VERSTAGE || ENV_BOOTBLOCK || !CONFIG(VBOOT)) /* * Claim locality 0, do it only during the first * initialization after reset. @@ -462,7 +483,10 @@ int tpm2_init(struct spi_slave *spi_if) if (!tpm2_claim_locality()) return -1; - read_tpm_sts(&status); + if (!read_tpm_sts(&status)) { + printk(BIOS_ERR, "Reading status reg failed\n"); + return -1; + } if ((status & TPM_STS_FAMILY_MASK) != TPM_STS_FAMILY_TPM_2_0) { printk(BIOS_ERR, "unexpected TPM family value, status: %#x\n", status); |