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Message-ID: <20240613025412.3848629-2-aryan.srivastava@alliedtelesis.co.nz>
Date: Thu, 13 Jun 2024 14:54:10 +1200
From: Aryan Srivastava <aryan.srivastava@...iedtelesis.co.nz>
To: Markus Elfring <Markus.Elfring@....de>
Cc: Andi Shyti <andi.shyti@...nel.org>,
Aryan Srivastava <aryan.srivastava@...iedtelesis.co.nz>,
Robert Richter <rric@...nel.org>,
linux-i2c@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH v6 1/2] i2c: octeon: refactor hlc r/w operations
Refactor the current implementation of the high-level composite read and
write operations in preparation of the addition of block-mode read/write
operations.
The sending of the i2c command is generic and will apply for both the
block-mode and non-block-mode R/W. Extract this from the current hlc
ops, and place into a generic function, octeon_i2c_hlc_cmd_send.
The considerations made for extended addresses in the command
construction are common for all r/w cases, extract these into
octeon_i2c_hlc_ext.
There are parts of the commands construction which are common (only in
the read case), extract this and place into generic function
octeon_i2c_hlc_read_cmd.
The write commands cannot be made entirely into common code as there are
distinct differences in the block mode and non-block-mode process.
Particularly the writing of data into the buffer.
Signed-off-by: Aryan Srivastava <aryan.srivastava@...iedtelesis.co.nz>
---
drivers/i2c/busses/i2c-octeon-core.c | 86 ++++++++++++++++------------
1 file changed, 49 insertions(+), 37 deletions(-)
diff --git a/drivers/i2c/busses/i2c-octeon-core.c b/drivers/i2c/busses/i2c-octeon-core.c
index 845eda70b8ca..6772359ca6c8 100644
--- a/drivers/i2c/busses/i2c-octeon-core.c
+++ b/drivers/i2c/busses/i2c-octeon-core.c
@@ -485,6 +485,50 @@ static int octeon_i2c_hlc_write(struct octeon_i2c *i2c, struct i2c_msg *msgs)
return ret;
}
+/* Process hlc transaction */
+static int octeon_i2c_hlc_cmd_send(struct octeon_i2c *i2c, u64 cmd)
+{
+ octeon_i2c_hlc_int_clear(i2c);
+ octeon_i2c_writeq_flush(cmd, i2c->twsi_base + SW_TWSI(i2c));
+
+ return octeon_i2c_hlc_wait(i2c);
+}
+
+/* Generic consideration for extended internal addresses in i2c hlc r/w ops */
+static bool octeon_i2c_hlc_ext(struct octeon_i2c *i2c, struct i2c_msg msg, u64 *cmd_in, u64 *ext)
+{
+ bool set_ext = false;
+ u64 cmd;
+
+ if (msg.flags & I2C_M_TEN)
+ cmd |= SW_TWSI_OP_10_IA;
+ else
+ cmd |= SW_TWSI_OP_7_IA;
+
+ if (msg.len == 2) {
+ cmd |= SW_TWSI_EIA;
+ *ext = (u64)msg.buf[0] << SW_TWSI_IA_SHIFT;
+ cmd |= (u64)msg.buf[1] << SW_TWSI_IA_SHIFT;
+ set_ext = true;
+ } else {
+ cmd |= (u64)msg.buf[0] << SW_TWSI_IA_SHIFT;
+ }
+
+ *cmd_in |= cmd;
+ return set_ext;
+}
+
+/* Construct and send i2c transaction core cmd for read ops */
+static int octeon_i2c_hlc_read_cmd(struct octeon_i2c *i2c, struct i2c_msg msg, u64 cmd)
+{
+ u64 ext = 0;
+
+ if (octeon_i2c_hlc_ext(i2c, msg, &cmd, &ext))
+ octeon_i2c_writeq_flush(ext, i2c->twsi_base + SW_TWSI_EXT(i2c));
+
+ return octeon_i2c_hlc_cmd_send(i2c, cmd);
+}
+
/* high-level-controller composite write+read, msg0=addr, msg1=data */
static int octeon_i2c_hlc_comp_read(struct octeon_i2c *i2c, struct i2c_msg *msgs)
{
@@ -499,26 +543,8 @@ static int octeon_i2c_hlc_comp_read(struct octeon_i2c *i2c, struct i2c_msg *msgs
/* A */
cmd |= (u64)(msgs[0].addr & 0x7full) << SW_TWSI_ADDR_SHIFT;
- if (msgs[0].flags & I2C_M_TEN)
- cmd |= SW_TWSI_OP_10_IA;
- else
- cmd |= SW_TWSI_OP_7_IA;
-
- if (msgs[0].len == 2) {
- u64 ext = 0;
-
- cmd |= SW_TWSI_EIA;
- ext = (u64)msgs[0].buf[0] << SW_TWSI_IA_SHIFT;
- cmd |= (u64)msgs[0].buf[1] << SW_TWSI_IA_SHIFT;
- octeon_i2c_writeq_flush(ext, i2c->twsi_base + SW_TWSI_EXT(i2c));
- } else {
- cmd |= (u64)msgs[0].buf[0] << SW_TWSI_IA_SHIFT;
- }
-
- octeon_i2c_hlc_int_clear(i2c);
- octeon_i2c_writeq_flush(cmd, i2c->twsi_base + SW_TWSI(i2c));
-
- ret = octeon_i2c_hlc_wait(i2c);
+ /* Send core command */
+ ret = octeon_i2c_hlc_cmd(i2c, msgs[0], cmd);
if (ret)
goto err;
@@ -554,19 +580,8 @@ static int octeon_i2c_hlc_comp_write(struct octeon_i2c *i2c, struct i2c_msg *msg
/* A */
cmd |= (u64)(msgs[0].addr & 0x7full) << SW_TWSI_ADDR_SHIFT;
- if (msgs[0].flags & I2C_M_TEN)
- cmd |= SW_TWSI_OP_10_IA;
- else
- cmd |= SW_TWSI_OP_7_IA;
-
- if (msgs[0].len == 2) {
- cmd |= SW_TWSI_EIA;
- ext |= (u64)msgs[0].buf[0] << SW_TWSI_IA_SHIFT;
- set_ext = true;
- cmd |= (u64)msgs[0].buf[1] << SW_TWSI_IA_SHIFT;
- } else {
- cmd |= (u64)msgs[0].buf[0] << SW_TWSI_IA_SHIFT;
- }
+ /* Set parameters for extended message (if required) */
+ set_ext = octeon_i2c_hlc_ext(i2c, msgs[0], &cmd, &ext);
for (i = 0, j = msgs[1].len - 1; i < msgs[1].len && i < 4; i++, j--)
cmd |= (u64)msgs[1].buf[j] << (8 * i);
@@ -579,10 +594,7 @@ static int octeon_i2c_hlc_comp_write(struct octeon_i2c *i2c, struct i2c_msg *msg
if (set_ext)
octeon_i2c_writeq_flush(ext, i2c->twsi_base + SW_TWSI_EXT(i2c));
- octeon_i2c_hlc_int_clear(i2c);
- octeon_i2c_writeq_flush(cmd, i2c->twsi_base + SW_TWSI(i2c));
-
- ret = octeon_i2c_hlc_wait(i2c);
+ ret = octeon_i2c_hlc_cmd_send(i2c, cmd);
if (ret)
goto err;
--
2.43.2
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