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Diffstat (limited to 'drivers/i2c/busses/i2c-tegra-bpmp.c')
-rw-r--r--drivers/i2c/busses/i2c-tegra-bpmp.c131
1 files changed, 65 insertions, 66 deletions
diff --git a/drivers/i2c/busses/i2c-tegra-bpmp.c b/drivers/i2c/busses/i2c-tegra-bpmp.c
index f6cd35d0a2ac..bb0de6db6391 100644
--- a/drivers/i2c/busses/i2c-tegra-bpmp.c
+++ b/drivers/i2c/busses/i2c-tegra-bpmp.c
@@ -1,21 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* drivers/i2c/busses/i2c-tegra-bpmp.c
*
* Copyright (c) 2016 NVIDIA Corporation. All rights reserved.
*
* Author: Shardar Shariff Md <smohammed@nvidia.com>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/err.h>
@@ -23,7 +12,7 @@
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
-#include <linux/of_device.h>
+#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
@@ -49,52 +38,34 @@ struct tegra_bpmp_i2c {
* firmware I2C driver to avoid any issues in future if Linux I2C flags are
* changed.
*/
-static int tegra_bpmp_xlate_flags(u16 flags, u16 *out)
+static void tegra_bpmp_xlate_flags(u16 flags, u16 *out)
{
- if (flags & I2C_M_TEN) {
+ if (flags & I2C_M_TEN)
*out |= SERIALI2C_TEN;
- flags &= ~I2C_M_TEN;
- }
- if (flags & I2C_M_RD) {
+ if (flags & I2C_M_RD)
*out |= SERIALI2C_RD;
- flags &= ~I2C_M_RD;
- }
- if (flags & I2C_M_STOP) {
+ if (flags & I2C_M_STOP)
*out |= SERIALI2C_STOP;
- flags &= ~I2C_M_STOP;
- }
- if (flags & I2C_M_NOSTART) {
+ if (flags & I2C_M_NOSTART)
*out |= SERIALI2C_NOSTART;
- flags &= ~I2C_M_NOSTART;
- }
- if (flags & I2C_M_REV_DIR_ADDR) {
+ if (flags & I2C_M_REV_DIR_ADDR)
*out |= SERIALI2C_REV_DIR_ADDR;
- flags &= ~I2C_M_REV_DIR_ADDR;
- }
- if (flags & I2C_M_IGNORE_NAK) {
+ if (flags & I2C_M_IGNORE_NAK)
*out |= SERIALI2C_IGNORE_NAK;
- flags &= ~I2C_M_IGNORE_NAK;
- }
- if (flags & I2C_M_NO_RD_ACK) {
+ if (flags & I2C_M_NO_RD_ACK)
*out |= SERIALI2C_NO_RD_ACK;
- flags &= ~I2C_M_NO_RD_ACK;
- }
- if (flags & I2C_M_RECV_LEN) {
+ if (flags & I2C_M_RECV_LEN)
*out |= SERIALI2C_RECV_LEN;
- flags &= ~I2C_M_RECV_LEN;
- }
-
- return (flags != 0) ? -EINVAL : 0;
}
-/**
+/*
* The serialized I2C format is simply the following:
* [addr little-endian][flags little-endian][len little-endian][data if write]
* [addr little-endian][flags little-endian][len little-endian][data if write]
@@ -108,22 +79,19 @@ static int tegra_bpmp_xlate_flags(u16 flags, u16 *out)
*
* See deserialize_i2c documentation for the data format in the other direction.
*/
-static int tegra_bpmp_serialize_i2c_msg(struct tegra_bpmp_i2c *i2c,
+static void tegra_bpmp_serialize_i2c_msg(struct tegra_bpmp_i2c *i2c,
struct mrq_i2c_request *request,
struct i2c_msg *msgs,
unsigned int num)
{
char *buf = request->xfer.data_buf;
unsigned int i, j, pos = 0;
- int err;
for (i = 0; i < num; i++) {
struct i2c_msg *msg = &msgs[i];
u16 flags = 0;
- err = tegra_bpmp_xlate_flags(msg->flags, &flags);
- if (err < 0)
- return err;
+ tegra_bpmp_xlate_flags(msg->flags, &flags);
buf[pos++] = msg->addr & 0xff;
buf[pos++] = (msg->addr & 0xff00) >> 8;
@@ -139,11 +107,9 @@ static int tegra_bpmp_serialize_i2c_msg(struct tegra_bpmp_i2c *i2c,
}
request->xfer.data_size = pos;
-
- return 0;
}
-/**
+/*
* The data in the BPMP -> CPU direction is composed of sequential blocks for
* those messages that have I2C_M_RD. So, for example, if you have:
*
@@ -207,7 +173,8 @@ static int tegra_bpmp_i2c_msg_len_check(struct i2c_msg *msgs, unsigned int num)
static int tegra_bpmp_i2c_msg_xfer(struct tegra_bpmp_i2c *i2c,
struct mrq_i2c_request *request,
- struct mrq_i2c_response *response)
+ struct mrq_i2c_response *response,
+ bool atomic)
{
struct tegra_bpmp_message msg;
int err;
@@ -222,16 +189,42 @@ static int tegra_bpmp_i2c_msg_xfer(struct tegra_bpmp_i2c *i2c,
msg.rx.data = response;
msg.rx.size = sizeof(*response);
- if (irqs_disabled())
+ if (atomic)
err = tegra_bpmp_transfer_atomic(i2c->bpmp, &msg);
else
err = tegra_bpmp_transfer(i2c->bpmp, &msg);
- return err;
+ if (err < 0) {
+ dev_err(i2c->dev, "failed to transfer message: %d\n", err);
+ return err;
+ }
+
+ if (msg.rx.ret != 0) {
+ if (msg.rx.ret == -BPMP_EAGAIN) {
+ dev_dbg(i2c->dev, "arbitration lost\n");
+ return -EAGAIN;
+ }
+
+ if (msg.rx.ret == -BPMP_ETIMEDOUT) {
+ dev_dbg(i2c->dev, "timeout\n");
+ return -ETIMEDOUT;
+ }
+
+ if (msg.rx.ret == -BPMP_ENXIO) {
+ dev_dbg(i2c->dev, "NAK\n");
+ return -ENXIO;
+ }
+
+ dev_err(i2c->dev, "transaction failed: %d\n", msg.rx.ret);
+ return -EIO;
+ }
+
+ return 0;
}
-static int tegra_bpmp_i2c_xfer(struct i2c_adapter *adapter,
- struct i2c_msg *msgs, int num)
+static int tegra_bpmp_i2c_xfer_common(struct i2c_adapter *adapter,
+ struct i2c_msg *msgs, int num,
+ bool atomic)
{
struct tegra_bpmp_i2c *i2c = i2c_get_adapdata(adapter);
struct mrq_i2c_response response;
@@ -247,13 +240,8 @@ static int tegra_bpmp_i2c_xfer(struct i2c_adapter *adapter,
memset(&request, 0, sizeof(request));
memset(&response, 0, sizeof(response));
- err = tegra_bpmp_serialize_i2c_msg(i2c, &request, msgs, num);
- if (err < 0) {
- dev_err(i2c->dev, "failed to serialize message: %d\n", err);
- return err;
- }
-
- err = tegra_bpmp_i2c_msg_xfer(i2c, &request, &response);
+ tegra_bpmp_serialize_i2c_msg(i2c, &request, msgs, num);
+ err = tegra_bpmp_i2c_msg_xfer(i2c, &request, &response, atomic);
if (err < 0) {
dev_err(i2c->dev, "failed to transfer message: %d\n", err);
return err;
@@ -268,6 +256,18 @@ static int tegra_bpmp_i2c_xfer(struct i2c_adapter *adapter,
return num;
}
+static int tegra_bpmp_i2c_xfer(struct i2c_adapter *adapter,
+ struct i2c_msg *msgs, int num)
+{
+ return tegra_bpmp_i2c_xfer_common(adapter, msgs, num, false);
+}
+
+static int tegra_bpmp_i2c_xfer_atomic(struct i2c_adapter *adapter,
+ struct i2c_msg *msgs, int num)
+{
+ return tegra_bpmp_i2c_xfer_common(adapter, msgs, num, true);
+}
+
static u32 tegra_bpmp_i2c_func(struct i2c_adapter *adapter)
{
return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | I2C_FUNC_10BIT_ADDR |
@@ -275,7 +275,8 @@ static u32 tegra_bpmp_i2c_func(struct i2c_adapter *adapter)
}
static const struct i2c_algorithm tegra_bpmp_i2c_algo = {
- .master_xfer = tegra_bpmp_i2c_xfer,
+ .xfer = tegra_bpmp_i2c_xfer,
+ .xfer_atomic = tegra_bpmp_i2c_xfer_atomic,
.functionality = tegra_bpmp_i2c_func,
};
@@ -304,7 +305,7 @@ static int tegra_bpmp_i2c_probe(struct platform_device *pdev)
i2c_set_adapdata(&i2c->adapter, i2c);
i2c->adapter.owner = THIS_MODULE;
- strlcpy(i2c->adapter.name, "Tegra BPMP I2C adapter",
+ strscpy(i2c->adapter.name, "Tegra BPMP I2C adapter",
sizeof(i2c->adapter.name));
i2c->adapter.algo = &tegra_bpmp_i2c_algo;
i2c->adapter.dev.parent = &pdev->dev;
@@ -315,13 +316,11 @@ static int tegra_bpmp_i2c_probe(struct platform_device *pdev)
return i2c_add_adapter(&i2c->adapter);
}
-static int tegra_bpmp_i2c_remove(struct platform_device *pdev)
+static void tegra_bpmp_i2c_remove(struct platform_device *pdev)
{
struct tegra_bpmp_i2c *i2c = platform_get_drvdata(pdev);
i2c_del_adapter(&i2c->adapter);
-
- return 0;
}
static const struct of_device_id tegra_bpmp_i2c_of_match[] = {
generated by cgit (git 2.34.1) at 2025-12-27 05:38:21 +0000