driver/pc80/tpm: Runtime generate ACPI table for TPM driver
Runtime write acpi table for TPM driver.
Change-Id: I70896e5874c24f17fca0c48b138ad4917b273f5b
Signed-off-by: Naresh G Solanki <naresh.solanki@intel.com>
Reviewed-on: https://review.coreboot.org/17425
Tested-by: build bot (Jenkins)
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
diff --git a/src/drivers/pc80/tpm/tpm.c b/src/drivers/pc80/tpm/tpm.c
index fbfb816..57ea919 100644
--- a/src/drivers/pc80/tpm/tpm.c
+++ b/src/drivers/pc80/tpm/tpm.c
@@ -27,6 +27,10 @@
#include <string.h>
#include <delay.h>
#include <arch/io.h>
+#include <arch/acpi.h>
+#include <arch/acpigen.h>
+#include <arch/acpi_device.h>
+#include <device/device.h>
#include <console/console.h>
#include <tpm.h>
#include <arch/early_variables.h>
@@ -34,7 +38,10 @@
#include "chip.h"
#define PREFIX "lpc_tpm: "
-
+/* TCG Physical Presence Interface */
+#define TPM_PPI_UUID "3dddfaa6-361b-4eb4-a424-8d10089d1653"
+/* TCG Memory Clear Interface */
+#define TPM_MCI_UUID "376054ed-cc13-4675-901c-4756d7f2d45d"
/* coreboot wrapper for TPM driver (start) */
#define TPM_DEBUG(fmt, args...) \
if (IS_ENABLED(CONFIG_DEBUG_TPM)) { \
@@ -211,6 +218,13 @@
write8(TIS_REG(locality, TIS_REG_INT_VECTOR), vector & 0xf);
}
+static inline u8 tpm_read_int_vector(int locality)
+{
+ u8 value = read8(TIS_REG(locality, TIS_REG_INT_VECTOR));
+ TPM_DEBUG_IO_READ(TIS_REG_INT_VECTOR, value);
+ return value;
+}
+
static inline void tpm_write_int_polarity(int polarity, int locality)
{
/* Set polarity and leave all other bits at 0 */
@@ -219,6 +233,15 @@
write32(TIS_REG(locality, TIS_REG_INT_ENABLE), value);
}
+static inline u32 tpm_read_int_polarity(int locality)
+{
+ /* Get polarity and leave all other bits */
+ u32 value = read8(TIS_REG(locality, TIS_REG_INT_ENABLE));
+ value = (value >> 3) & 0x3;
+ TPM_DEBUG_IO_READ(TIS_REG_INT_ENABLE, value);
+ return value;
+}
+
/*
* tis_wait_sts()
*
@@ -750,9 +773,232 @@
}
}
+#if IS_ENABLED(CONFIG_HAVE_ACPI_TABLES)
+
+static void tpm_ppi_func0_cb(void *arg)
+{
+ /* Functions 1-8. */
+ u8 buf[] = {0xff, 0x01};
+ acpigen_write_return_byte_buffer(buf, 2);
+}
+
+static void tpm_ppi_func1_cb(void *arg)
+{
+ if (IS_ENABLED(CONFIG_TPM2))
+ /* Interface version: 2.0 */
+ acpigen_write_return_string("2.0");
+ else
+ /* Interface version: 1.2 */
+ acpigen_write_return_string("1.2");
+}
+
+static void tpm_ppi_func2_cb(void *arg)
+{
+ /* Submit operations: drop on the floor and return success. */
+ acpigen_write_return_byte(0);
+}
+
+static void tpm_ppi_func3_cb(void *arg)
+{
+ /* Pending operation: none. */
+ acpigen_emit_byte(RETURN_OP);
+ acpigen_write_package(2);
+ acpigen_write_byte(0);
+ acpigen_write_byte(0);
+ acpigen_pop_len();
+}
+static void tpm_ppi_func4_cb(void *arg)
+{
+ /* Pre-OS transition method: reboot. */
+ acpigen_write_return_byte(2);
+}
+static void tpm_ppi_func5_cb(void *arg)
+{
+ /* Operation response: no operation executed. */
+ acpigen_emit_byte(RETURN_OP);
+ acpigen_write_package(3);
+ acpigen_write_byte(0);
+ acpigen_write_byte(0);
+ acpigen_write_byte(0);
+ acpigen_pop_len();
+}
+static void tpm_ppi_func6_cb(void *arg)
+{
+ /*
+ * Set preferred user language: deprecated and must return 3 aka
+ * "not implemented".
+ */
+ acpigen_write_return_byte(3);
+}
+static void tpm_ppi_func7_cb(void *arg)
+{
+ /* Submit operations: deny. */
+ acpigen_write_return_byte(3);
+}
+static void tpm_ppi_func8_cb(void *arg)
+{
+ /* All actions are forbidden. */
+ acpigen_write_return_byte(1);
+}
+static void (*tpm_ppi_callbacks[])(void *) = {
+ tpm_ppi_func0_cb,
+ tpm_ppi_func1_cb,
+ tpm_ppi_func2_cb,
+ tpm_ppi_func3_cb,
+ tpm_ppi_func4_cb,
+ tpm_ppi_func5_cb,
+ tpm_ppi_func6_cb,
+ tpm_ppi_func7_cb,
+ tpm_ppi_func8_cb,
+};
+
+static void tpm_mci_func0_cb(void *arg)
+{
+ /* Function 1. */
+ acpigen_write_return_singleton_buffer(0x3);
+}
+static void tpm_mci_func1_cb(void *arg)
+{
+ /* Just return success. */
+ acpigen_write_return_byte(0);
+}
+
+static void (*tpm_mci_callbacks[])(void *) = {
+ tpm_mci_func0_cb,
+ tpm_mci_func1_cb,
+};
+
+static void lpc_tpm_fill_ssdt(struct device *dev)
+{
+ const char *path = acpi_device_path(dev->bus->dev);
+ u32 arg;
+ struct opregion opreg = OPREGION("TREG", SYSTEMMEMORY,
+ CONFIG_TPM_TIS_BASE_ADDRESS, 0x5000);
+
+ if (!path)
+ return;
+
+ /* Device */
+ acpigen_write_scope(path);
+ acpigen_write_device(acpi_device_name(dev));
+
+ acpigen_write_name("_HID");
+ acpigen_emit_eisaid("PNP0C31");
+
+ acpigen_write_name("_CID");
+ acpigen_emit_eisaid("PNP0C31");
+
+ acpigen_write_name_integer("_UID", 1);
+
+ acpigen_write_opregion(&opreg);
+
+ struct fieldlist tpm_field_list[] = {
+ /*
+ * TPM_INT_ENABLE_0
+ * bit 0 : dataAvailIntEnable,
+ * bit 1 : stsValidIntEnable,
+ * bit 2 : localityChangeIntEnable,
+ * bit 3:4 typePolarity.
+ */
+ FIELDLIST_OFFSET(0x8),
+ FIELDLIST_NAMESTR("INTE", 3),
+ FIELDLIST_NAMESTR("ITPL", 2),
+
+ /* TPM_INT_VECTOR_0 */
+ FIELDLIST_OFFSET(0xC),
+ FIELDLIST_NAMESTR("IVEC", 4),
+
+ /* TPM_DID_VID */
+ FIELDLIST_OFFSET(0xf00),
+ FIELDLIST_NAMESTR("DVID", 32),
+ };
+
+ acpigen_write_field(opreg.name, tpm_field_list,
+ ARRAY_SIZE(tpm_field_list),
+ FIELD_BYTEACC | FIELD_NOLOCK | FIELD_PRESERVE);
+
+ u32 did_vid = tpm_read_did_vid(0);
+ if (did_vid > 0 && did_vid < 0xffffffff)
+ acpigen_write_STA(ACPI_STATUS_DEVICE_ALL_ON);
+ else
+ acpigen_write_STA(ACPI_STATUS_DEVICE_ALL_OFF);
+
+ /* Resources */
+ acpigen_write_name("_CRS");
+ acpigen_write_resourcetemplate_header();
+ acpigen_write_mem32fixed(1, CONFIG_TPM_TIS_BASE_ADDRESS, 0x5000);
+ acpigen_write_io16(0x2e, 0x2e, 1, 2, 1);
+
+ if (CONFIG_TPM_PIRQ) {
+ /*
+ * PIRQ: Update interrupt vector with configured PIRQ
+ * Active-Low Level-Triggered Shared
+ */
+ struct acpi_irq tpm_irq_a = IRQ_LEVEL_LOW(CONFIG_TPM_PIRQ);
+ acpi_device_write_interrupt(&tpm_irq_a);
+ } else if (tpm_read_int_vector(0) > 0) {
+ u8 int_vec = tpm_read_int_vector(0);
+ u8 int_pol = tpm_read_int_polarity(0);
+ struct acpi_irq tpm_irq = IRQ_LEVEL_LOW(int_vec);
+
+ if (int_pol & 1)
+ tpm_irq.polarity = IRQ_ACTIVE_LOW;
+ else
+ tpm_irq.polarity = IRQ_ACTIVE_HIGH;
+
+ if (int_pol & 2)
+ tpm_irq.mode = IRQ_EDGE_TRIGGERED;
+ else
+ tpm_irq.mode = IRQ_LEVEL_TRIGGERED;
+
+ acpi_device_write_interrupt(&tpm_irq);
+ }
+
+ acpigen_write_resourcetemplate_footer();
+
+ if (!IS_ENABLED(CONFIG_CHROMEOS)) {
+ /*
+ * _DSM method
+ */
+ struct dsm_uuid ids[] = {
+ /* Physical presence interface.
+ * This is used to submit commands like "Clear TPM" to
+ * be run at next reboot provided that user confirms
+ * them. Spec allows user to cancel all commands and/or
+ * configure BIOS to reject commands. So we pretend that
+ * user did just this: cancelled everything. If user
+ * really wants to clear TPM the only option now is to
+ * do it manually in payload.
+ */
+ DSM_UUID(TPM_PPI_UUID, &tpm_ppi_callbacks[0],
+ ARRAY_SIZE(tpm_ppi_callbacks), (void *) &arg),
+ /* Memory clearing on boot: just a dummy. */
+ DSM_UUID(TPM_MCI_UUID, &tpm_mci_callbacks[0],
+ ARRAY_SIZE(tpm_mci_callbacks), (void *) &arg),
+ };
+
+ acpigen_write_dsm_uuid_arr(ids, ARRAY_SIZE(ids));
+ }
+ acpigen_pop_len(); /* Device */
+ acpigen_pop_len(); /* Scope */
+
+ printk(BIOS_INFO, "%s.%s: %s %s\n", path, acpi_device_name(dev),
+ dev->chip_ops->name, dev_path(dev));
+}
+
+static const char *lpc_tpm_acpi_name(struct device *dev)
+{
+ return "TPM";
+}
+#endif
+
static struct device_operations lpc_tpm_ops = {
.read_resources = &lpc_tpm_read_resources,
.set_resources = &lpc_tpm_set_resources,
+#if IS_ENABLED(CONFIG_HAVE_ACPI_TABLES)
+ .acpi_name = &lpc_tpm_acpi_name,
+ .acpi_fill_ssdt_generator = &lpc_tpm_fill_ssdt,
+#endif
};
static struct pnp_info pnp_dev_info[] = {