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path: root/drivers/char/tpm/tpm_crb.c
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Diffstat (limited to 'drivers/char/tpm/tpm_crb.c')
-rw-r--r--drivers/char/tpm/tpm_crb.c100
1 files changed, 90 insertions, 10 deletions
diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c
index 7e9da671a0e8..d43a0d7b97a8 100644
--- a/drivers/char/tpm/tpm_crb.c
+++ b/drivers/char/tpm/tpm_crb.c
@@ -98,6 +98,8 @@ struct crb_priv {
u8 __iomem *rsp;
u32 cmd_size;
u32 smc_func_id;
+ u32 __iomem *pluton_start_addr;
+ u32 __iomem *pluton_reply_addr;
};
struct tpm2_crb_smc {
@@ -108,6 +110,11 @@ struct tpm2_crb_smc {
u32 smc_func_id;
};
+struct tpm2_crb_pluton {
+ u64 start_addr;
+ u64 reply_addr;
+};
+
static bool crb_wait_for_reg_32(u32 __iomem *reg, u32 mask, u32 value,
unsigned long timeout)
{
@@ -127,6 +134,25 @@ static bool crb_wait_for_reg_32(u32 __iomem *reg, u32 mask, u32 value,
return ((ioread32(reg) & mask) == value);
}
+static int crb_try_pluton_doorbell(struct crb_priv *priv, bool wait_for_complete)
+{
+ if (priv->sm != ACPI_TPM2_COMMAND_BUFFER_WITH_PLUTON)
+ return 0;
+
+ if (!crb_wait_for_reg_32(priv->pluton_reply_addr, ~0, 1, TPM2_TIMEOUT_C))
+ return -ETIME;
+
+ iowrite32(1, priv->pluton_start_addr);
+ if (wait_for_complete == false)
+ return 0;
+
+ if (!crb_wait_for_reg_32(priv->pluton_start_addr,
+ 0xffffffff, 0, 200))
+ return -ETIME;
+
+ return 0;
+}
+
/**
* __crb_go_idle - request tpm crb device to go the idle state
*
@@ -145,6 +171,8 @@ static bool crb_wait_for_reg_32(u32 __iomem *reg, u32 mask, u32 value,
*/
static int __crb_go_idle(struct device *dev, struct crb_priv *priv)
{
+ int rc;
+
if ((priv->sm == ACPI_TPM2_START_METHOD) ||
(priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_START_METHOD) ||
(priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_ARM_SMC))
@@ -152,6 +180,10 @@ static int __crb_go_idle(struct device *dev, struct crb_priv *priv)
iowrite32(CRB_CTRL_REQ_GO_IDLE, &priv->regs_t->ctrl_req);
+ rc = crb_try_pluton_doorbell(priv, true);
+ if (rc)
+ return rc;
+
if (!crb_wait_for_reg_32(&priv->regs_t->ctrl_req,
CRB_CTRL_REQ_GO_IDLE/* mask */,
0, /* value */
@@ -188,12 +220,19 @@ static int crb_go_idle(struct tpm_chip *chip)
*/
static int __crb_cmd_ready(struct device *dev, struct crb_priv *priv)
{
+ int rc;
+
if ((priv->sm == ACPI_TPM2_START_METHOD) ||
(priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_START_METHOD) ||
(priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_ARM_SMC))
return 0;
iowrite32(CRB_CTRL_REQ_CMD_READY, &priv->regs_t->ctrl_req);
+
+ rc = crb_try_pluton_doorbell(priv, true);
+ if (rc)
+ return rc;
+
if (!crb_wait_for_reg_32(&priv->regs_t->ctrl_req,
CRB_CTRL_REQ_CMD_READY /* mask */,
0, /* value */
@@ -371,6 +410,10 @@ static int crb_send(struct tpm_chip *chip, u8 *buf, size_t len)
return -E2BIG;
}
+ /* Seems to be necessary for every command */
+ if (priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_PLUTON)
+ __crb_cmd_ready(&chip->dev, priv);
+
memcpy_toio(priv->cmd, buf, len);
/* Make sure that cmd is populated before issuing start. */
@@ -394,7 +437,10 @@ static int crb_send(struct tpm_chip *chip, u8 *buf, size_t len)
rc = tpm_crb_smc_start(&chip->dev, priv->smc_func_id);
}
- return rc;
+ if (rc)
+ return rc;
+
+ return crb_try_pluton_doorbell(priv, false);
}
static void crb_cancel(struct tpm_chip *chip)
@@ -524,15 +570,18 @@ static int crb_map_io(struct acpi_device *device, struct crb_priv *priv,
return ret;
acpi_dev_free_resource_list(&acpi_resource_list);
- if (resource_type(iores_array) != IORESOURCE_MEM) {
- dev_err(dev, FW_BUG "TPM2 ACPI table does not define a memory resource\n");
- return -EINVAL;
- } else if (resource_type(iores_array + TPM_CRB_MAX_RESOURCES) ==
- IORESOURCE_MEM) {
- dev_warn(dev, "TPM2 ACPI table defines too many memory resources\n");
- memset(iores_array + TPM_CRB_MAX_RESOURCES,
- 0, sizeof(*iores_array));
- iores_array[TPM_CRB_MAX_RESOURCES].flags = 0;
+ /* Pluton doesn't appear to define ACPI memory regions */
+ if (priv->sm != ACPI_TPM2_COMMAND_BUFFER_WITH_PLUTON) {
+ if (resource_type(iores_array) != IORESOURCE_MEM) {
+ dev_err(dev, FW_BUG "TPM2 ACPI table does not define a memory resource\n");
+ return -EINVAL;
+ } else if (resource_type(iores_array + TPM_CRB_MAX_RESOURCES) ==
+ IORESOURCE_MEM) {
+ dev_warn(dev, "TPM2 ACPI table defines too many memory resources\n");
+ memset(iores_array + TPM_CRB_MAX_RESOURCES,
+ 0, sizeof(*iores_array));
+ iores_array[TPM_CRB_MAX_RESOURCES].flags = 0;
+ }
}
iores = NULL;
@@ -656,6 +705,22 @@ out_relinquish_locality:
return ret;
}
+static int crb_map_pluton(struct device *dev, struct crb_priv *priv,
+ struct acpi_table_tpm2 *buf, struct tpm2_crb_pluton *crb_pluton)
+{
+ priv->pluton_start_addr = crb_map_res(dev, NULL, NULL,
+ crb_pluton->start_addr, 4);
+ if (IS_ERR(priv->pluton_start_addr))
+ return PTR_ERR(priv->pluton_start_addr);
+
+ priv->pluton_reply_addr = crb_map_res(dev, NULL, NULL,
+ crb_pluton->reply_addr, 4);
+ if (IS_ERR(priv->pluton_reply_addr))
+ return PTR_ERR(priv->pluton_reply_addr);
+
+ return 0;
+}
+
static int crb_acpi_add(struct acpi_device *device)
{
struct acpi_table_tpm2 *buf;
@@ -663,6 +728,7 @@ static int crb_acpi_add(struct acpi_device *device)
struct tpm_chip *chip;
struct device *dev = &device->dev;
struct tpm2_crb_smc *crb_smc;
+ struct tpm2_crb_pluton *crb_pluton;
acpi_status status;
u32 sm;
int rc;
@@ -700,6 +766,20 @@ static int crb_acpi_add(struct acpi_device *device)
priv->smc_func_id = crb_smc->smc_func_id;
}
+ if (sm == ACPI_TPM2_COMMAND_BUFFER_WITH_PLUTON) {
+ if (buf->header.length < (sizeof(*buf) + sizeof(*crb_pluton))) {
+ dev_err(dev,
+ FW_BUG "TPM2 ACPI table has wrong size %u for start method type %d\n",
+ buf->header.length,
+ ACPI_TPM2_COMMAND_BUFFER_WITH_PLUTON);
+ return -EINVAL;
+ }
+ crb_pluton = ACPI_ADD_PTR(struct tpm2_crb_pluton, buf, sizeof(*buf));
+ rc = crb_map_pluton(dev, priv, buf, crb_pluton);
+ if (rc)
+ return rc;
+ }
+
priv->sm = sm;
priv->hid = acpi_device_hid(device);