diff mbox series

[v4,1/7] tpm: tpm_tis: Make implementation of read16 read32 write32 optional

Message ID 20200331113207.107080-2-amirmizi6@gmail.com (mailing list archive)
State New, archived
Headers show
Series Add tpm i2c ptp driver | expand

Commit Message

Amir Mizinski March 31, 2020, 11:32 a.m. UTC 
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(-)

--
2.7.4



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Comments

Jarkko Sakkinen March 31, 2020, 12:04 p.m. UTC | #1 
On Tue, Mar 31, 2020 at 02:32:01PM +0300, amirmizi6@gmail.com wrote:
> 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>

Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>

/Jarkko
diff mbox series

Patch

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)