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tpm_crb: encapsulate crb_wait_for_reg_32 

Encapsulated crb_wait_for_reg32() so that state changes in other CRB
registers than TPM_CRB_CTRL_REQ_x can be waited.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com>
Tested-by: Gang Wei <gang.wei@intel.com>
This commit is contained in:
Jarkko Sakkinen 2017-02-08 13:11:36 +02:00
parent 13b1f4a571
commit 38eb24ebb0
1 changed files with 23 additions and 14 deletions
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37
drivers/char/tpm/tpm_crb.c
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@ -121,6 +121,25 @@ static int __maybe_unused crb_go_idle(struct device *dev, struct crb_priv *priv)
return 0;
}
static bool crb_wait_for_reg_32(u32 __iomem *reg, u32 mask, u32 value,
unsigned long timeout)
{
ktime_t start;
ktime_t stop;
start = ktime_get();
stop = ktime_add(start, ms_to_ktime(timeout));
do {
if ((ioread32(reg) & mask) == value)
return true;
usleep_range(50, 100);
} while (ktime_before(ktime_get(), stop));
return false;
}
/**
* crb_cmd_ready - request tpm crb device to enter ready state
*
@ -138,24 +157,14 @@ static int __maybe_unused crb_go_idle(struct device *dev, struct crb_priv *priv)
static int __maybe_unused crb_cmd_ready(struct device *dev,
struct crb_priv *priv)
{
ktime_t stop, start;
u32 req;
if (priv->flags & CRB_FL_ACPI_START)
return 0;
iowrite32(CRB_CTRL_REQ_CMD_READY, &priv->regs_t->ctrl_req);
start = ktime_get();
stop = ktime_add(start, ms_to_ktime(TPM2_TIMEOUT_C));
do {
req = ioread32(&priv->regs_t->ctrl_req);
if (!(req & CRB_CTRL_REQ_CMD_READY))
return 0;
usleep_range(50, 100);
} while (ktime_before(ktime_get(), stop));
if (ioread32(&priv->regs_t->ctrl_req) & CRB_CTRL_REQ_CMD_READY) {
if (!crb_wait_for_reg_32(&priv->regs_t->ctrl_req,
CRB_CTRL_REQ_CMD_READY /* mask */,
0, /* value */
TPM2_TIMEOUT_C)) {
dev_warn(dev, "cmdReady timed out\n");
return -ETIME;
}