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https://github.com/linux-sunxi/u-boot-sunxi.git
synced 2024-02-12 11:16:03 +08:00
tpm: Support using driver model with I2C
As a first step towards converting the TPM system to driver model, allow it to work with CONFIG_DM_I2C. Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass
@ -37,6 +37,7 @@
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*/
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#include <common.h>
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#include <dm.h>
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#include <fdtdec.h>
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#include <linux/compiler.h>
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#include <i2c.h>
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@ -122,13 +123,19 @@ static const char * const chip_name[] = {
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/* Structure to store I2C TPM specific stuff */
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struct tpm_dev {
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#ifdef CONFIG_DM_I2C
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struct udevice *dev;
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#else
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uint addr;
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#endif
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u8 buf[TPM_DEV_BUFSIZE + sizeof(u8)]; /* Max buffer size + addr */
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enum i2c_chip_type chip_type;
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};
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static struct tpm_dev tpm_dev = {
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#ifndef CONFIG_DM_I2C
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.addr = TPM_I2C_ADDR
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#endif
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};
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static struct tpm_dev tpm_dev;
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@ -156,8 +163,12 @@ static int iic_tpm_read(u8 addr, u8 *buffer, size_t len)
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if ((tpm_dev.chip_type == SLB9635) || (tpm_dev.chip_type == UNKNOWN)) {
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/* slb9635 protocol should work in both cases */
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for (count = 0; count < MAX_COUNT; count++) {
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#ifdef CONFIG_DM_I2C
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rc = dm_i2c_write(tpm_dev.dev, 0, (uchar *)&addrbuf, 1);
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#else
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rc = i2c_write(tpm_dev.addr, 0, 0,
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(uchar *)&addrbuf, 1);
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#endif
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if (rc == 0)
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break; /* Success, break to skip sleep */
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udelay(SLEEP_DURATION);
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@ -171,7 +182,11 @@ static int iic_tpm_read(u8 addr, u8 *buffer, size_t len)
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*/
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for (count = 0; count < MAX_COUNT; count++) {
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udelay(SLEEP_DURATION);
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#ifdef CONFIG_DM_I2C
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rc = dm_i2c_read(tpm_dev.dev, 0, buffer, len);
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#else
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rc = i2c_read(tpm_dev.addr, 0, 0, buffer, len);
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#endif
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if (rc == 0)
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break; /* success, break to skip sleep */
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}
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@ -184,7 +199,11 @@ static int iic_tpm_read(u8 addr, u8 *buffer, size_t len)
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* be safe on the safe side.
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*/
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for (count = 0; count < MAX_COUNT; count++) {
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#ifdef CONFIG_DM_I2C
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rc = dm_i2c_read(tpm_dev.dev, addr, buffer, len);
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#else
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rc = i2c_read(tpm_dev.addr, addr, 1, buffer, len);
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#endif
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if (rc == 0)
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break; /* break here to skip sleep */
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udelay(SLEEP_DURATION);
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@ -206,18 +225,26 @@ static int iic_tpm_write_generic(u8 addr, u8 *buffer, size_t len,
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int count;
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/* Prepare send buffer */
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#ifndef CONFIG_DM_I2C
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tpm_dev.buf[0] = addr;
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memcpy(&(tpm_dev.buf[1]), buffer, len);
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buffer = tpm_dev.buf;
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len++;
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#endif
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for (count = 0; count < max_count; count++) {
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rc = i2c_write(tpm_dev.addr, 0, 0, tpm_dev.buf, len + 1);
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#ifdef CONFIG_DM_I2C
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rc = dm_i2c_write(tpm_dev.dev, addr, buffer, len);
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#else
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rc = i2c_write(tpm_dev.addr, 0, 0, buffer, len);
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#endif
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if (rc == 0)
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break; /* Success, break to skip sleep */
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udelay(sleep_time);
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}
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/* take care of 'guard time' */
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udelay(SLEEP_DURATION);
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udelay(sleep_time);
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if (rc)
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return -rc;
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@ -292,11 +319,14 @@ static int request_locality(struct tpm_chip *chip, int loc)
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{
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unsigned long start, stop;
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u8 buf = TPM_ACCESS_REQUEST_USE;
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int rc;
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if (check_locality(chip, loc) >= 0)
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return loc; /* We already have the locality */
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iic_tpm_write(TPM_ACCESS(loc), &buf, 1);
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rc = iic_tpm_write(TPM_ACCESS(loc), &buf, 1);
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if (rc)
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return rc;
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/* Wait for burstcount */
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start = get_timer(0);
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@ -323,10 +353,15 @@ static u8 tpm_tis_i2c_status(struct tpm_chip *chip)
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static void tpm_tis_i2c_ready(struct tpm_chip *chip)
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{
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int rc;
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/* This causes the current command to be aborted */
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u8 buf = TPM_STS_COMMAND_READY;
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iic_tpm_write_long(TPM_STS(chip->vendor.locality), &buf, 1);
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debug("%s\n", __func__);
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rc = iic_tpm_write_long(TPM_STS(chip->vendor.locality), &buf, 1);
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if (rc)
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debug("%s: rc=%d\n", __func__, rc);
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}
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static ssize_t get_burstcount(struct tpm_chip *chip)
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@ -422,6 +457,8 @@ static int tpm_tis_i2c_recv(struct tpm_chip *chip, u8 *buf, size_t count)
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expected = get_unaligned_be32(buf + TPM_RSP_SIZE_BYTE);
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if ((size_t)expected > count) {
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error("Error size=%x, expected=%x, count=%x\n", size, expected,
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count);
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size = -EIO;
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goto out;
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}
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@ -456,11 +493,12 @@ out:
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static int tpm_tis_i2c_send(struct tpm_chip *chip, u8 *buf, size_t len)
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{
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int rc, status;
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ssize_t burstcnt;
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size_t burstcnt;
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size_t count = 0;
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int retry = 0;
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u8 sts = TPM_STS_GO;
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debug("%s: len=%d\n", __func__, len);
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if (len > TPM_DEV_BUFSIZE)
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return -E2BIG; /* Command is too long for our tpm, sorry */
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@ -483,9 +521,10 @@ static int tpm_tis_i2c_send(struct tpm_chip *chip, u8 *buf, size_t len)
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if (burstcnt < 0)
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return burstcnt;
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while (count < len - 1) {
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if (burstcnt > len - 1 - count)
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burstcnt = len - 1 - count;
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while (count < len) {
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udelay(300);
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if (burstcnt > len - count)
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burstcnt = len - count;
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#ifdef CONFIG_TPM_TIS_I2C_BURST_LIMITATION
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if (retry && burstcnt > CONFIG_TPM_TIS_I2C_BURST_LIMITATION)
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@ -497,9 +536,15 @@ static int tpm_tis_i2c_send(struct tpm_chip *chip, u8 *buf, size_t len)
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if (rc == 0)
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count += burstcnt;
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else {
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retry++;
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wait_for_stat(chip, TPM_STS_VALID,
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chip->vendor.timeout_c, &status);
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debug("%s: error\n", __func__);
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if (retry++ > 10) {
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rc = -EIO;
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goto out_err;
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}
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rc = wait_for_stat(chip, TPM_STS_VALID,
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chip->vendor.timeout_c, &status);
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if (rc)
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goto out_err;
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if ((status & TPM_STS_DATA_EXPECT) == 0) {
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rc = -EIO;
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@ -508,20 +553,14 @@ static int tpm_tis_i2c_send(struct tpm_chip *chip, u8 *buf, size_t len)
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}
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}
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/* Write last byte */
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iic_tpm_write(TPM_DATA_FIFO(chip->vendor.locality), &(buf[count]), 1);
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wait_for_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c, &status);
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if ((status & TPM_STS_DATA_EXPECT) != 0) {
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rc = -EIO;
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goto out_err;
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}
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/* Go and do it */
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iic_tpm_write(TPM_STS(chip->vendor.locality), &sts, 1);
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debug("done\n");
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return len;
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out_err:
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debug("%s: out_err\n", __func__);
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tpm_tis_i2c_ready(chip);
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/*
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* The TPM needs some time to clean up here,
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@ -558,26 +597,17 @@ static enum i2c_chip_type tpm_vendor_chip_type(void)
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return UNKNOWN;
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}
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/* Initialisation of i2c tpm */
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int tpm_vendor_init(uint32_t dev_addr)
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static int tpm_vendor_init_common(void)
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{
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struct tpm_chip *chip;
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u32 vendor;
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u32 expected_did_vid;
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uint old_addr;
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int rc = 0;
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struct tpm_chip *chip;
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old_addr = tpm_dev.addr;
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if (dev_addr != 0)
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tpm_dev.addr = dev_addr;
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tpm_dev.chip_type = tpm_vendor_chip_type();
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chip = tpm_register_hardware(&tpm_tis_i2c);
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if (chip < 0) {
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rc = -ENODEV;
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goto out_err;
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}
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if (chip < 0)
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return -ENODEV;
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/* Disable interrupts (not supported) */
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chip->vendor.irq = 0;
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@ -588,15 +618,13 @@ int tpm_vendor_init(uint32_t dev_addr)
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chip->vendor.timeout_c = TIS_SHORT_TIMEOUT;
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chip->vendor.timeout_d = TIS_SHORT_TIMEOUT;
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if (request_locality(chip, 0) < 0) {
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rc = -ENODEV;
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goto out_err;
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}
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if (request_locality(chip, 0) < 0)
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return -ENODEV;
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/* Read four bytes from DID_VID register */
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if (iic_tpm_read(TPM_DID_VID(0), (uchar *)&vendor, 4) < 0) {
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rc = -EIO;
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goto out_release;
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release_locality(chip, 0, 1);
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return -EIO;
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}
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if (tpm_dev.chip_type == SLB9635) {
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@ -609,8 +637,7 @@ int tpm_vendor_init(uint32_t dev_addr)
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if (tpm_dev.chip_type != UNKNOWN && vendor != expected_did_vid) {
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error("Vendor id did not match! ID was %08x\n", vendor);
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rc = -ENODEV;
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goto out_release;
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return -ENODEV;
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}
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debug("1.2 TPM (chip type %s device-id 0x%X)\n",
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@ -622,14 +649,33 @@ int tpm_vendor_init(uint32_t dev_addr)
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*/
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return 0;
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}
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out_release:
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release_locality(chip, 0, 1);
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#ifdef CONFIG_DM_I2C
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/* Initialisation of i2c tpm */
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int tpm_vendor_init_dev(struct udevice *dev)
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{
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tpm_dev.dev = dev;
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return tpm_vendor_init_common();
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}
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#else
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/* Initialisation of i2c tpm */
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int tpm_vendor_init(uint32_t dev_addr)
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{
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uint old_addr;
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int rc = 0;
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old_addr = tpm_dev.addr;
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if (dev_addr != 0)
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tpm_dev.addr = dev_addr;
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rc = tpm_vendor_init_common();
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if (rc)
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tpm_dev.addr = old_addr;
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out_err:
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tpm_dev.addr = old_addr;
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return rc;
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}
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#endif
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void tpm_vendor_cleanup(struct tpm_chip *chip)
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{
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