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authorWinkler, Tomas <tomas.winkler@intel.com>2016-09-15 10:27:38 +0300
committerJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>2016-11-28 01:31:29 +0200
commitba5287b6ef6a2ee91dc6cc0829649cecf7b70253 (patch)
tree931ec227dd3319ee00fad0d9e19aa276a19c6d17 /drivers/char
parent0821e30cd2f246a93c5271f6c23d7134f809d70d (diff)
downloadop-kernel-dev-ba5287b6ef6a2ee91dc6cc0829649cecf7b70253.zip
op-kernel-dev-ba5287b6ef6a2ee91dc6cc0829649cecf7b70253.tar.gz
tpm/tpm_crb: implement tpm crb idle state
The register TPM_CRB_CTRL_REQ_x contains bits goIdle and cmdReady for SW to indicate that the device can enter or should exit the idle state. The legacy ACPI-start (SMI + DMA) based devices do not support these bits and the idle state management is not exposed to the host SW. Thus, this functionality only is enabled only for a CRB start (MMIO) based devices. Based on Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> original patch: 'tpm_crb: implement power tpm crb power management' To keep the implementation local to the hw we don't use wait_for_tpm_stat for polling the TPM_CRB_CTRL_REQ. [jarkko.sakkinen@linux.intel.com: removed cmdReady debug trace on a success case due the heavy amount of log traffic it causes.] Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Diffstat (limited to 'drivers/char')
-rw-r--r--drivers/char/tpm/tpm_crb.c66
1 files changed, 66 insertions, 0 deletions
diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c
index a7c870a..8dd0f20 100644
--- a/drivers/char/tpm/tpm_crb.c
+++ b/drivers/char/tpm/tpm_crb.c
@@ -83,6 +83,72 @@ struct crb_priv {
u32 cmd_size;
};
+/**
+ * crb_go_idle - request tpm crb device to go the idle state
+ *
+ * @dev: crb device
+ * @priv: crb private data
+ *
+ * Write CRB_CTRL_REQ_GO_IDLE to TPM_CRB_CTRL_REQ
+ * The device should respond within TIMEOUT_C by clearing the bit.
+ * Anyhow, we do not wait here as a consequent CMD_READY request
+ * will be handled correctly even if idle was not completed.
+ *
+ * The function does nothing for devices with ACPI-start method.
+ *
+ * Return: 0 always
+ */
+static int __maybe_unused crb_go_idle(struct device *dev, struct crb_priv *priv)
+{
+ if (priv->flags & CRB_FL_ACPI_START)
+ return 0;
+
+ iowrite32(CRB_CTRL_REQ_GO_IDLE, &priv->cca->req);
+ /* we don't really care when this settles */
+
+ return 0;
+}
+
+/**
+ * crb_cmd_ready - request tpm crb device to enter ready state
+ *
+ * @dev: crb device
+ * @priv: crb private data
+ *
+ * Write CRB_CTRL_REQ_CMD_READY to TPM_CRB_CTRL_REQ
+ * and poll till the device acknowledge it by clearing the bit.
+ * The device should respond within TIMEOUT_C.
+ *
+ * The function does nothing for devices with ACPI-start method
+ *
+ * Return: 0 on success -ETIME on timeout;
+ */
+static int __maybe_unused crb_cmd_ready(struct device *dev,
+ struct crb_priv *priv)
+{
+ ktime_t stop, start;
+
+ if (priv->flags & CRB_FL_ACPI_START)
+ return 0;
+
+ iowrite32(CRB_CTRL_REQ_CMD_READY, &priv->cca->req);
+
+ start = ktime_get();
+ stop = ktime_add(start, ms_to_ktime(TPM2_TIMEOUT_C));
+ do {
+ if (!(ioread32(&priv->cca->req) & CRB_CTRL_REQ_CMD_READY))
+ return 0;
+ usleep_range(50, 100);
+ } while (ktime_before(ktime_get(), stop));
+
+ if (ioread32(&priv->cca->req) & CRB_CTRL_REQ_CMD_READY) {
+ dev_warn(dev, "cmdReady timed out\n");
+ return -ETIME;
+ }
+
+ return 0;
+}
+
static SIMPLE_DEV_PM_OPS(crb_pm, tpm_pm_suspend, tpm_pm_resume);
static u8 crb_status(struct tpm_chip *chip)
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