diff options
Diffstat (limited to 'src/drivers')
| -rw-r--r-- | src/drivers/i2c/tpm/cr50.c | 25 |
1 files changed, 14 insertions, 11 deletions
diff --git a/src/drivers/i2c/tpm/cr50.c b/src/drivers/i2c/tpm/cr50.c index 66278519b3..1190262100 100644 --- a/src/drivers/i2c/tpm/cr50.c +++ b/src/drivers/i2c/tpm/cr50.c @@ -42,9 +42,12 @@ #include "tpm.h" +#define SLEEP_DURATION 60 /* in usec */ +#define SLEEP_DURATION_LONG 210 /* in usec */ +#define SLEEP_DURATION_SAFE 750 /* in usec */ +#define SLEEP_DURATION_PROBE_MS 1000 /* in msec */ + #define CR50_MAX_BUFSIZE 63 -#define CR50_TIMEOUT_LONG_MS 2000 /* Long timeout while waiting for TPM */ -#define CR50_TIMEOUT_SHORT_MS 2 /* Short timeout during transactions */ #define CR50_DID_VID 0x00281ae0L struct tpm_inf_dev { @@ -82,7 +85,7 @@ static int iic_tpm_read(uint8_t addr, uint8_t *buffer, size_t len) } /* Wait for TPM to be ready with response data */ - mdelay(CR50_TIMEOUT_SHORT_MS); + udelay(SLEEP_DURATION_SAFE); /* Read response data from the TPM */ if (i2c_read_raw(tpm_dev->bus, tpm_dev->addr, buffer, len)) { @@ -126,7 +129,7 @@ static int iic_tpm_write(uint8_t addr, uint8_t *buffer, size_t len) } /* Wait for TPM to be ready */ - mdelay(CR50_TIMEOUT_SHORT_MS); + udelay(SLEEP_DURATION_SAFE); return 0; } @@ -198,7 +201,6 @@ static void cr50_tis_i2c_ready(struct tpm_chip *chip) { uint8_t buf[4] = { TPM_STS_COMMAND_READY }; iic_tpm_write(TPM_STS(chip->vendor.locality), buf, sizeof(buf)); - mdelay(CR50_TIMEOUT_SHORT_MS); } /* cr50 uses bytes 3:2 of status register for burst count and @@ -209,13 +211,13 @@ static int cr50_wait_burst_status(struct tpm_chip *chip, uint8_t mask, uint8_t buf[4]; struct stopwatch sw; - stopwatch_init_msecs_expire(&sw, CR50_TIMEOUT_LONG_MS); + stopwatch_init_msecs_expire(&sw, 2000); while (!stopwatch_expired(&sw)) { if (iic_tpm_read(TPM_STS(chip->vendor.locality), buf, sizeof(buf)) != 0) { printk(BIOS_WARNING, "%s: Read failed\n", __func__); - mdelay(CR50_TIMEOUT_SHORT_MS); + udelay(SLEEP_DURATION_SAFE); continue; } @@ -227,7 +229,7 @@ static int cr50_wait_burst_status(struct tpm_chip *chip, uint8_t mask, *burst > 0 && *burst <= CR50_MAX_BUFSIZE) return 0; - mdelay(CR50_TIMEOUT_SHORT_MS); + udelay(SLEEP_DURATION_SAFE); } printk(BIOS_ERR, "%s: Timeout reading burst and status\n", __func__); @@ -308,7 +310,7 @@ static int cr50_tis_i2c_send(struct tpm_chip *chip, uint8_t *buf, size_t len) uint8_t tpm_go[4] = { TPM_STS_GO }; struct stopwatch sw; - stopwatch_init_msecs_expire(&sw, CR50_TIMEOUT_LONG_MS); + stopwatch_init_msecs_expire(&sw, 2000); /* Wait until TPM is ready for a command */ while (!(cr50_tis_i2c_status(chip) & TPM_STS_COMMAND_READY)) { @@ -319,6 +321,7 @@ static int cr50_tis_i2c_send(struct tpm_chip *chip, uint8_t *buf, size_t len) } cr50_tis_i2c_ready(chip); + udelay(SLEEP_DURATION_SAFE); } while (len > 0) { @@ -385,7 +388,7 @@ int tpm_vendor_probe(unsigned bus, uint32_t addr) struct stopwatch sw; uint8_t buf = 0; int ret; - long sw_run_duration = CR50_TIMEOUT_LONG_MS; + long sw_run_duration = SLEEP_DURATION_PROBE_MS; tpm_dev->bus = bus; tpm_dev->addr = addr; @@ -398,7 +401,7 @@ int tpm_vendor_probe(unsigned bus, uint32_t addr) sw_run_duration = stopwatch_duration_msecs(&sw); break; } - mdelay(CR50_TIMEOUT_SHORT_MS); + udelay(SLEEP_DURATION_SAFE); } while (!stopwatch_expired(&sw)); printk(BIOS_INFO, |