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path: root/drivers/thunderbolt/usb4.c
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Diffstat (limited to 'drivers/thunderbolt/usb4.c')
-rw-r--r--drivers/thunderbolt/usb4.c112
1 files changed, 45 insertions, 67 deletions
diff --git a/drivers/thunderbolt/usb4.c b/drivers/thunderbolt/usb4.c
index de480bf2a53d..140e0da3a8de 100644
--- a/drivers/thunderbolt/usb4.c
+++ b/drivers/thunderbolt/usb4.c
@@ -17,12 +17,6 @@
#define USB4_DATA_RETRIES 3
#define USB4_DATA_DWORDS 16
-enum usb4_sb_target {
- USB4_SB_TARGET_ROUTER,
- USB4_SB_TARGET_PARTNER,
- USB4_SB_TARGET_RETIMER,
-};
-
#define USB4_NVM_READ_OFFSET_MASK GENMASK(23, 2)
#define USB4_NVM_READ_OFFSET_SHIFT 2
#define USB4_NVM_READ_LENGTH_MASK GENMASK(27, 24)
@@ -1289,8 +1283,20 @@ static int usb4_port_write_data(struct tb_port *port, const void *data,
dwords);
}
-static int usb4_port_sb_read(struct tb_port *port, enum usb4_sb_target target,
- u8 index, u8 reg, void *buf, u8 size)
+/**
+ * usb4_port_sb_read() - Read from sideband register
+ * @port: USB4 port to read
+ * @target: Sideband target
+ * @index: Retimer index if taget is %USB4_SB_TARGET_RETIMER
+ * @reg: Sideband register index
+ * @buf: Buffer where the sideband data is copied
+ * @size: Size of @buf
+ *
+ * Reads data from sideband register @reg and copies it into @buf.
+ * Returns %0 in case of success and negative errno in case of failure.
+ */
+int usb4_port_sb_read(struct tb_port *port, enum usb4_sb_target target, u8 index,
+ u8 reg, void *buf, u8 size)
{
size_t dwords = DIV_ROUND_UP(size, 4);
int ret;
@@ -1329,8 +1335,20 @@ static int usb4_port_sb_read(struct tb_port *port, enum usb4_sb_target target,
return buf ? usb4_port_read_data(port, buf, dwords) : 0;
}
-static int usb4_port_sb_write(struct tb_port *port, enum usb4_sb_target target,
- u8 index, u8 reg, const void *buf, u8 size)
+/**
+ * usb4_port_sb_write() - Write to sideband register
+ * @port: USB4 port to write
+ * @target: Sideband target
+ * @index: Retimer index if taget is %USB4_SB_TARGET_RETIMER
+ * @reg: Sideband register index
+ * @buf: Data to write
+ * @size: Size of @buf
+ *
+ * Writes @buf to sideband register @reg. Returns %0 in case of success
+ * and negative errno in case of failure.
+ */
+int usb4_port_sb_write(struct tb_port *port, enum usb4_sb_target target,
+ u8 index, u8 reg, const void *buf, u8 size)
{
size_t dwords = DIV_ROUND_UP(size, 4);
int ret;
@@ -1777,47 +1795,6 @@ int usb4_port_retimer_unset_inbound_sbtx(struct tb_port *port, u8 index)
}
/**
- * usb4_port_retimer_read() - Read from retimer sideband registers
- * @port: USB4 port
- * @index: Retimer index
- * @reg: Sideband register to read
- * @buf: Data from @reg is stored here
- * @size: Number of bytes to read
- *
- * Function reads retimer sideband registers starting from @reg. The
- * retimer is connected to @port at @index. Returns %0 in case of
- * success, and read data is copied to @buf. If there is no retimer
- * present at given @index returns %-ENODEV. In any other failure
- * returns negative errno.
- */
-int usb4_port_retimer_read(struct tb_port *port, u8 index, u8 reg, void *buf,
- u8 size)
-{
- return usb4_port_sb_read(port, USB4_SB_TARGET_RETIMER, index, reg, buf,
- size);
-}
-
-/**
- * usb4_port_retimer_write() - Write to retimer sideband registers
- * @port: USB4 port
- * @index: Retimer index
- * @reg: Sideband register to write
- * @buf: Data that is written starting from @reg
- * @size: Number of bytes to write
- *
- * Writes retimer sideband registers starting from @reg. The retimer is
- * connected to @port at @index. Returns %0 in case of success. If there
- * is no retimer present at given @index returns %-ENODEV. In any other
- * failure returns negative errno.
- */
-int usb4_port_retimer_write(struct tb_port *port, u8 index, u8 reg,
- const void *buf, u8 size)
-{
- return usb4_port_sb_write(port, USB4_SB_TARGET_RETIMER, index, reg, buf,
- size);
-}
-
-/**
* usb4_port_retimer_is_last() - Is the retimer last on-board retimer
* @port: USB4 port
* @index: Retimer index
@@ -1837,8 +1814,8 @@ int usb4_port_retimer_is_last(struct tb_port *port, u8 index)
if (ret)
return ret;
- ret = usb4_port_retimer_read(port, index, USB4_SB_METADATA, &metadata,
- sizeof(metadata));
+ ret = usb4_port_sb_read(port, USB4_SB_TARGET_RETIMER, index,
+ USB4_SB_METADATA, &metadata, sizeof(metadata));
return ret ? ret : metadata & 1;
}
@@ -1863,8 +1840,8 @@ int usb4_port_retimer_nvm_sector_size(struct tb_port *port, u8 index)
if (ret)
return ret;
- ret = usb4_port_retimer_read(port, index, USB4_SB_METADATA, &metadata,
- sizeof(metadata));
+ ret = usb4_port_sb_read(port, USB4_SB_TARGET_RETIMER, index,
+ USB4_SB_METADATA, &metadata, sizeof(metadata));
return ret ? ret : metadata & USB4_NVM_SECTOR_SIZE_MASK;
}
@@ -1889,8 +1866,8 @@ int usb4_port_retimer_nvm_set_offset(struct tb_port *port, u8 index,
metadata = (dwaddress << USB4_NVM_SET_OFFSET_SHIFT) &
USB4_NVM_SET_OFFSET_MASK;
- ret = usb4_port_retimer_write(port, index, USB4_SB_METADATA, &metadata,
- sizeof(metadata));
+ ret = usb4_port_sb_write(port, USB4_SB_TARGET_RETIMER, index,
+ USB4_SB_METADATA, &metadata, sizeof(metadata));
if (ret)
return ret;
@@ -1912,8 +1889,8 @@ static int usb4_port_retimer_nvm_write_next_block(void *data,
u8 index = info->index;
int ret;
- ret = usb4_port_retimer_write(port, index, USB4_SB_DATA,
- buf, dwords * 4);
+ ret = usb4_port_sb_write(port, USB4_SB_TARGET_RETIMER, index,
+ USB4_SB_DATA, buf, dwords * 4);
if (ret)
return ret;
@@ -1992,8 +1969,8 @@ int usb4_port_retimer_nvm_authenticate_status(struct tb_port *port, u8 index,
u32 metadata, val;
int ret;
- ret = usb4_port_retimer_read(port, index, USB4_SB_OPCODE, &val,
- sizeof(val));
+ ret = usb4_port_sb_read(port, USB4_SB_TARGET_RETIMER, index,
+ USB4_SB_OPCODE, &val, sizeof(val));
if (ret)
return ret;
@@ -2004,8 +1981,9 @@ int usb4_port_retimer_nvm_authenticate_status(struct tb_port *port, u8 index,
return 0;
case -EAGAIN:
- ret = usb4_port_retimer_read(port, index, USB4_SB_METADATA,
- &metadata, sizeof(metadata));
+ ret = usb4_port_sb_read(port, USB4_SB_TARGET_RETIMER, index,
+ USB4_SB_METADATA, &metadata,
+ sizeof(metadata));
if (ret)
return ret;
@@ -2030,8 +2008,8 @@ static int usb4_port_retimer_nvm_read_block(void *data, unsigned int dwaddress,
if (dwords < USB4_DATA_DWORDS)
metadata |= dwords << USB4_NVM_READ_LENGTH_SHIFT;
- ret = usb4_port_retimer_write(port, index, USB4_SB_METADATA, &metadata,
- sizeof(metadata));
+ ret = usb4_port_sb_write(port, USB4_SB_TARGET_RETIMER, index,
+ USB4_SB_METADATA, &metadata, sizeof(metadata));
if (ret)
return ret;
@@ -2039,8 +2017,8 @@ static int usb4_port_retimer_nvm_read_block(void *data, unsigned int dwaddress,
if (ret)
return ret;
- return usb4_port_retimer_read(port, index, USB4_SB_DATA, buf,
- dwords * 4);
+ return usb4_port_sb_read(port, USB4_SB_TARGET_RETIMER, index,
+ USB4_SB_DATA, buf, dwords * 4);
}
/**
generated by cgit v1.2.3 (git 2.25.1) at 2025-11-07 00:29:55 +0000