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From:   <amirmizi6@gmail.com>
To:     <Eyal.Cohen@nuvoton.com>, <jarkko.sakkinen@linux.intel.com>,
        <oshrialkoby85@gmail.com>, <alexander.steffen@infineon.com>,
        <robh+dt@kernel.org>, <mark.rutland@arm.com>, <peterhuewe@gmx.de>,
        <jgg@ziepe.ca>, <arnd@arndb.de>, <gregkh@linuxfoundation.org>
CC:     <devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <linux-integrity@vger.kernel.org>, <oshri.alkoby@nuvoton.com>,
        <tmaimon77@gmail.com>, <gcwilson@us.ibm.com>,
        <kgoldman@us.ibm.com>, <Dan.Morav@nuvoton.com>,
        <oren.tanami@nuvoton.com>, <shmulik.hager@nuvoton.com>,
        <amir.mizinski@nuvoton.com>, Amir Mizinski <amirmizi6@gmail.com>,
        Alexander Steffen <Alexander.Steffen@infineon.com>
Subject: [PATCH v4 1/7] tpm: tpm_tis: Make implementation of read16 read32 write32 optional
Date:   Tue, 31 Mar 2020 14:32:01 +0300
Message-ID: <20200331113207.107080-2-amirmizi6@gmail.com>
In-Reply-To: <20200331113207.107080-1-amirmizi6@gmail.com>
References: <20200331113207.107080-1-amirmizi6@gmail.com>
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From: Amir Mizinski <amirmizi6@gmail.com>

Only tpm_tis can use memory mapped I/O, which is truly mapped into
the kernel's memory space. So using ioread16/ioread32/iowrite32 turn into a
straightforward pointer dereference.
Every other driver require more complicated operations to read more than 1
byte at a time and will just fall back to read_bytes/write_bytes.
Therefore, move this common code out of tpm_tis_spi into tpm_tis_core, so
that it is automatically used when low-level drivers do not implement the
specialized methods.

Co-developed-by: Alexander Steffen <Alexander.Steffen@infineon.com>
Signed-off-by: Alexander Steffen <Alexander.Steffen@infineon.com>
Signed-off-by: Amir Mizinski <amirmizi6@gmail.com>
---
 drivers/char/tpm/tpm_tis_core.h     | 38 +++++++++++++++++++++++++++++++---
 drivers/char/tpm/tpm_tis_spi_main.c | 41 -------------------------------------
 2 files changed, 35 insertions(+), 44 deletions(-)

diff --git a/drivers/char/tpm/tpm_tis_core.h b/drivers/char/tpm/tpm_tis_core.h
index 7337819..d06c65b 100644
--- a/drivers/char/tpm/tpm_tis_core.h
+++ b/drivers/char/tpm/tpm_tis_core.h
@@ -122,13 +122,35 @@ static inline int tpm_tis_read8(struct tpm_tis_data *data, u32 addr, u8 *result)
 static inline int tpm_tis_read16(struct tpm_tis_data *data, u32 addr,
                                 u16 *result)
 {
-       return data->phy_ops->read16(data, addr, result);
+       __le16 result_le;
+       int rc;
+
+       if (data->phy_ops->read16)
+               return data->phy_ops->read16(data, addr, result);
+
+       rc = data->phy_ops->read_bytes(data, addr, sizeof(u16),
+                                      (u8 *)&result_le);
+       if (!rc)
+               *result = le16_to_cpu(result_le);
+
+       return rc;
 }

 static inline int tpm_tis_read32(struct tpm_tis_data *data, u32 addr,
                                 u32 *result)
 {
-       return data->phy_ops->read32(data, addr, result);
+       __le32 result_le;
+       int rc;
+
+       if (data->phy_ops->read32)
+               return data->phy_ops->read32(data, addr, result);
+
+       rc = data->phy_ops->read_bytes(data, addr, sizeof(u32),
+                                      (u8 *)&result_le);
+       if (!rc)
+               *result = le32_to_cpu(result_le);
+
+       return rc;
 }

 static inline int tpm_tis_write_bytes(struct tpm_tis_data *data, u32 addr,
@@ -145,7 +167,17 @@ static inline int tpm_tis_write8(struct tpm_tis_data *data, u32 addr, u8 value)
 static inline int tpm_tis_write32(struct tpm_tis_data *data, u32 addr,
                                  u32 value)
 {
-       return data->phy_ops->write32(data, addr, value);
+       __le32 value_le;
+       int rc;
+
+       if (data->phy_ops->write32)
+               return data->phy_ops->write32(data, addr, value);
+
+       value_le = cpu_to_le32(value);
+       rc = data->phy_ops->write_bytes(data, addr, sizeof(u32),
+                                       (u8 *)&value_le);
+
+       return rc;
 }

 static inline bool is_bsw(void)
diff --git a/drivers/char/tpm/tpm_tis_spi_main.c b/drivers/char/tpm/tpm_tis_spi_main.c
index d1754fd..95fef9d 100644
--- a/drivers/char/tpm/tpm_tis_spi_main.c
+++ b/drivers/char/tpm/tpm_tis_spi_main.c
@@ -152,44 +152,6 @@ static int tpm_tis_spi_write_bytes(struct tpm_tis_data *data, u32 addr,
        return tpm_tis_spi_transfer(data, addr, len, NULL, value);
 }

-int tpm_tis_spi_read16(struct tpm_tis_data *data, u32 addr, u16 *result)
-{
-       __le16 result_le;
-       int rc;
-
-       rc = data->phy_ops->read_bytes(data, addr, sizeof(u16),
-                                      (u8 *)&result_le);
-       if (!rc)
-               *result = le16_to_cpu(result_le);
-
-       return rc;
-}
-
-int tpm_tis_spi_read32(struct tpm_tis_data *data, u32 addr, u32 *result)
-{
-       __le32 result_le;
-       int rc;
-
-       rc = data->phy_ops->read_bytes(data, addr, sizeof(u32),
-                                      (u8 *)&result_le);
-       if (!rc)
-               *result = le32_to_cpu(result_le);
-
-       return rc;
-}
-
-int tpm_tis_spi_write32(struct tpm_tis_data *data, u32 addr, u32 value)
-{
-       __le32 value_le;
-       int rc;
-
-       value_le = cpu_to_le32(value);
-       rc = data->phy_ops->write_bytes(data, addr, sizeof(u32),
-                                       (u8 *)&value_le);
-
-       return rc;
-}
-
 int tpm_tis_spi_init(struct spi_device *spi, struct tpm_tis_spi_phy *phy,
                     int irq, const struct tpm_tis_phy_ops *phy_ops)
 {
@@ -205,9 +167,6 @@ int tpm_tis_spi_init(struct spi_device *spi, struct tpm_tis_spi_phy *phy,
 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,
 };

 static int tpm_tis_spi_probe(struct spi_device *dev)
--
2.7.4


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