From 6110010f7b88392a3094f2aaec91ee54151cde2a Mon Sep 17 00:00:00 2001
From: "SkyLake.Huang" <skylake.huang@mediatek.com>
Date: Thu, 23 Jun 2022 18:43:02 +0800
Subject: [PATCH] drivers: char: tpm: Add calibration example for SPI TPM
 module

Signed-off-by: SkyLake.Huang <skylake.huang@mediatek.com>
---
 drivers/char/tpm/tpm_tis_core.c | 19 +++++++++++++++++++
 drivers/char/tpm/tpm_tis_core.h |  2 ++
 drivers/char/tpm/tpm_tis_spi.c  |  7 +++++++
 3 files changed, 28 insertions(+)

--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -817,6 +817,21 @@ static const struct tpm_class_ops tpm_ti
 	.clk_enable = tpm_tis_clkrun_enable,
 };
 
+int tpm_tis_cal_read(void *priv, u32 *addr, int addrlen, u8 *buf, int readlen)
+{
+	int rc;
+	u32 vendor;
+
+	rc = tpm_tis_read32((struct tpm_tis_data *)priv, TPM_DID_VID(0), &vendor);
+	if (rc < 0)
+		return -EIO;
+
+	buf[0] = (vendor >> 24) & 0xff;
+	buf[1] = (vendor >> 16) & 0xff;
+
+	return 0;
+}
+
 int tpm_tis_core_init(struct device *dev, struct tpm_tis_data *priv, int irq,
 		      const struct tpm_tis_phy_ops *phy_ops,
 		      acpi_handle acpi_dev_handle)
@@ -864,6 +879,10 @@ int tpm_tis_core_init(struct device *dev
 	if (chip->ops->clk_enable != NULL)
 		chip->ops->clk_enable(chip, true);
 
+	rc = priv->phy_ops->do_calibration(priv, dev);
+	if (rc)
+		goto out_err;
+
 	if (wait_startup(chip, 0) != 0) {
 		rc = -ENODEV;
 		goto out_err;
--- a/drivers/char/tpm/tpm_tis_core.h
+++ b/drivers/char/tpm/tpm_tis_core.h
@@ -106,6 +106,7 @@ struct tpm_tis_phy_ops {
 	int (*read16)(struct tpm_tis_data *data, u32 addr, u16 *result);
 	int (*read32)(struct tpm_tis_data *data, u32 addr, u32 *result);
 	int (*write32)(struct tpm_tis_data *data, u32 addr, u32 src);
+	int (*do_calibration)(struct tpm_tis_data *data, struct device *dev);
 };
 
 static inline int tpm_tis_read_bytes(struct tpm_tis_data *data, u32 addr,
@@ -158,6 +159,7 @@ static inline bool is_bsw(void)
 }
 
 void tpm_tis_remove(struct tpm_chip *chip);
+int tpm_tis_cal_read(void *priv, u32 *addr, int addrlen, u8 *buf, int readlen);
 int tpm_tis_core_init(struct device *dev, struct tpm_tis_data *priv, int irq,
 		      const struct tpm_tis_phy_ops *phy_ops,
 		      acpi_handle acpi_dev_handle);
--- a/drivers/char/tpm/tpm_tis_spi.c
+++ b/drivers/char/tpm/tpm_tis_spi.c
@@ -184,12 +184,19 @@ static int tpm_tis_spi_write32(struct tp
 	return rc;
 }
 
+int tpm_tis_spi_do_calibration(struct tpm_tis_data *priv, struct device *dev) {
+	struct spi_device *spi = container_of(dev,
+                                         struct spi_device, dev);
+	return spi_do_calibration(spi->master, spi, tpm_tis_cal_read, priv);
+}
+
 static const struct tpm_tis_phy_ops tpm_spi_phy_ops = {
 	.read_bytes = tpm_tis_spi_read_bytes,
 	.write_bytes = tpm_tis_spi_write_bytes,
 	.read16 = tpm_tis_spi_read16,
 	.read32 = tpm_tis_spi_read32,
 	.write32 = tpm_tis_spi_write32,
+	.do_calibration = tpm_tis_spi_do_calibration,
 };
 
 static int tpm_tis_spi_probe(struct spi_device *dev)