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Diffstat (limited to 'src/drivers/i2c/tpm/tpm.c')
-rw-r--r--src/drivers/i2c/tpm/tpm.c94
1 files changed, 44 insertions, 50 deletions
diff --git a/src/drivers/i2c/tpm/tpm.c b/src/drivers/i2c/tpm/tpm.c
index 306005f5dd..727feb618b 100644
--- a/src/drivers/i2c/tpm/tpm.c
+++ b/src/drivers/i2c/tpm/tpm.c
@@ -28,6 +28,7 @@
* GNU General Public License for more details.
*/
+#include <arch/early_variables.h>
#include <stdint.h>
#include <string.h>
#include <types.h>
@@ -37,9 +38,6 @@
#include <endian.h>
#include "tpm.h"
-/* Address of the TPM on the I2C bus */
-#define TPM_I2C_ADDR 0x20
-
/* max. number of iterations after I2C NAK */
#define MAX_COUNT 3
@@ -78,10 +76,7 @@ struct tpm_inf_dev {
enum i2c_chip_type chip_type;
};
-static struct tpm_inf_dev tpm_dev = {
- .bus = -1,
- .addr = TPM_I2C_ADDR
-};
+static struct tpm_inf_dev g_tpm_dev CAR_GLOBAL;
/*
* iic_tpm_read() - read from TPM register
@@ -99,15 +94,18 @@ static struct tpm_inf_dev tpm_dev = {
*/
static int iic_tpm_read(uint8_t addr, uint8_t *buffer, size_t len)
{
+ struct tpm_inf_dev *tpm_dev = car_get_var_ptr(&g_tpm_dev);
int rc;
int count;
- if (tpm_dev.bus < 0)
+ if (tpm_dev->addr == 0)
return -1;
- if ((tpm_dev.chip_type == SLB9635) || (tpm_dev.chip_type == UNKNOWN)) {
+ if ((tpm_dev->chip_type == SLB9635) ||
+ (tpm_dev->chip_type == UNKNOWN)) {
/* slb9635 protocol should work in both cases */
for (count = 0; count < MAX_COUNT; count++) {
- rc = i2c_write_raw(tpm_dev.bus, tpm_dev.addr, &addr, 1);
+ rc = i2c_write_raw(tpm_dev->bus, tpm_dev->addr,
+ &addr, 1);
if (rc == 0)
break; /* success, break to skip sleep */
@@ -123,7 +121,7 @@ static int iic_tpm_read(uint8_t addr, uint8_t *buffer, size_t len)
*/
for (count = 0; count < MAX_COUNT; count++) {
udelay(SLEEP_DURATION);
- rc = i2c_read_raw(tpm_dev.bus, tpm_dev.addr,
+ rc = i2c_read_raw(tpm_dev->bus, tpm_dev->addr,
buffer, len);
if (rc == 0)
break; /* success, break to skip sleep */
@@ -136,13 +134,13 @@ static int iic_tpm_read(uint8_t addr, uint8_t *buffer, size_t len)
* retries should usually not be needed, but are kept just to
* be safe on the safe side.
*/
- struct i2c_seg aseg = { .read = 0, .chip = tpm_dev.addr,
+ struct i2c_seg aseg = { .read = 0, .chip = tpm_dev->addr,
.buf = &addr, .len = 1 };
- struct i2c_seg dseg = { .read = 1, .chip = tpm_dev.addr,
+ struct i2c_seg dseg = { .read = 1, .chip = tpm_dev->addr,
.buf = buffer, .len = len };
for (count = 0; count < MAX_COUNT; count++) {
- rc = i2c_transfer(tpm_dev.bus, &aseg, 1) ||
- i2c_transfer(tpm_dev.bus, &dseg, 1);
+ rc = i2c_transfer(tpm_dev->bus, &aseg, 1) ||
+ i2c_transfer(tpm_dev->bus, &dseg, 1);
if (rc == 0)
break; /* break here to skip sleep */
udelay(SLEEP_DURATION);
@@ -161,6 +159,7 @@ static int iic_tpm_write_generic(uint8_t addr, uint8_t *buffer, size_t len,
unsigned int sleep_time,
uint8_t max_count)
{
+ struct tpm_inf_dev *tpm_dev = car_get_var_ptr(&g_tpm_dev);
int rc = 0;
int count;
@@ -170,14 +169,14 @@ static int iic_tpm_write_generic(uint8_t addr, uint8_t *buffer, size_t len,
}
/* prepare send buffer */
- tpm_dev.buf[0] = addr;
- memcpy(&(tpm_dev.buf[1]), buffer, len);
+ tpm_dev->buf[0] = addr;
+ memcpy(&(tpm_dev->buf[1]), buffer, len);
- if (tpm_dev.bus < 0)
+ if (tpm_dev->addr == 0)
return -1;
for (count = 0; count < max_count; count++) {
- rc = i2c_write_raw(tpm_dev.bus, tpm_dev.addr,
- tpm_dev.buf, len + 1);
+ rc = i2c_write_raw(tpm_dev->bus, tpm_dev->addr,
+ tpm_dev->buf, len + 1);
if (rc == 0)
break; /* success, break to skip sleep */
@@ -480,55 +479,53 @@ out_err:
return -1;
}
-static struct tpm_vendor_specific tpm_tis_i2c = {
- .status = tpm_tis_i2c_status,
- .recv = tpm_tis_i2c_recv,
- .send = tpm_tis_i2c_send,
- .cancel = tpm_tis_i2c_ready,
- .req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
- .req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
- .req_canceled = TPM_STS_COMMAND_READY,
-};
-
/* Initialization of I2C TPM */
-int tpm_vendor_init(unsigned bus, uint32_t dev_addr)
+int tpm_vendor_init(struct tpm_chip *chip, unsigned bus, uint32_t dev_addr)
{
+ struct tpm_inf_dev *tpm_dev = car_get_var_ptr(&g_tpm_dev);
uint32_t vendor;
- unsigned int old_addr;
- struct tpm_chip *chip;
- extern struct tpm_chip g_chip;
- old_addr = tpm_dev.addr;
- if (dev_addr != 0)
- tpm_dev.addr = dev_addr;
- tpm_dev.bus = bus;
+ if (dev_addr == 0) {
+ printk(BIOS_ERR, "%s: missing device address\n", __func__);
+ return -1;
+ }
- chip = &g_chip;
- memcpy(&chip->vendor, &tpm_tis_i2c, sizeof(struct tpm_vendor_specific));
+ tpm_dev->bus = bus;
+ tpm_dev->addr = dev_addr;
+
+ memset(&chip->vendor, 0, sizeof(struct tpm_vendor_specific));
chip->is_open = 1;
+ chip->vendor.status = &tpm_tis_i2c_status;
+ chip->vendor.recv = &tpm_tis_i2c_recv;
+ chip->vendor.send = &tpm_tis_i2c_send;
+ chip->vendor.cancel = &tpm_tis_i2c_ready;
+ chip->vendor.req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID;
+ chip->vendor.req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID;
+ chip->vendor.req_canceled = TPM_STS_COMMAND_READY;
+
/* Disable interrupts (not supported) */
chip->vendor.irq = 0;
if (request_locality(chip, 0) != 0)
- goto out_err;
+ return -1;
/* Read four bytes from DID_VID register */
if (iic_tpm_read(TPM_DID_VID(0), (uint8_t *)&vendor, 4) < 0)
- goto out_release;
+ goto out_err;
if (vendor == TPM_TIS_I2C_DID_VID_9645) {
- tpm_dev.chip_type = SLB9645;
+ tpm_dev->chip_type = SLB9645;
} else if (be32_to_cpu(vendor) == TPM_TIS_I2C_DID_VID_9635) {
- tpm_dev.chip_type = SLB9635;
+ tpm_dev->chip_type = SLB9635;
} else {
printk(BIOS_DEBUG, "Vendor ID 0x%08x not recognized.\n", vendor);
- goto out_release;
+ goto out_err;
}
printk(BIOS_DEBUG, "1.2 TPM (chip type %s device-id 0x%X)\n",
- chip_name[tpm_dev.chip_type], vendor >> 16);
+ chip_name[tpm_dev->chip_type], vendor >> 16);
/*
* A timeout query to TPM can be placed here.
@@ -537,11 +534,8 @@ int tpm_vendor_init(unsigned bus, uint32_t dev_addr)
return 0;
-out_release:
- release_locality(chip, 0, 1);
-
out_err:
- tpm_dev.addr = old_addr;
+ release_locality(chip, 0, 1);
return -1;
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-15 22:35:55 +0000