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-rw-r--r--drivers/misc/Kconfig13
-rw-r--r--drivers/misc/Makefile1
-rw-r--r--drivers/misc/eeprom/ee1004.c94
-rw-r--r--drivers/misc/mei/Kconfig24
-rw-r--r--drivers/misc/mei/Makefile7
-rw-r--r--drivers/misc/mei/platform-vsc.c450
-rw-r--r--drivers/misc/mei/vsc-fw-loader.c822
-rw-r--r--drivers/misc/mei/vsc-tp.c555
-rw-r--r--drivers/misc/mei/vsc-tp.h50
-rw-r--r--drivers/misc/nsm.c506
-rw-r--r--drivers/misc/ocxl/afu_irq.c2
-rw-r--r--drivers/misc/ocxl/context.c2
-rw-r--r--drivers/misc/ocxl/link.c14
-rw-r--r--drivers/misc/ocxl/main.c2
14 files changed, 2501 insertions, 41 deletions
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index f37c4b8380ae..8932b6cf9595 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -562,6 +562,19 @@ config TPS6594_PFSM
This driver can also be built as a module. If so, the module
will be called tps6594-pfsm.
+config NSM
+ tristate "Nitro (Enclaves) Security Module support"
+ depends on VIRTIO
+ select HW_RANDOM
+ select CBOR
+ help
+ This driver provides support for the Nitro Security Module
+ in AWS EC2 Nitro based Enclaves. The driver exposes a /dev/nsm
+ device user space can use to communicate with the hypervisor.
+
+ To compile this driver as a module, choose M here.
+ The module will be called nsm.
+
source "drivers/misc/c2port/Kconfig"
source "drivers/misc/eeprom/Kconfig"
source "drivers/misc/cb710/Kconfig"
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index f2a4d1ff65d4..ea6ea5bbbc9c 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -67,3 +67,4 @@ obj-$(CONFIG_TMR_MANAGER) += xilinx_tmr_manager.o
obj-$(CONFIG_TMR_INJECT) += xilinx_tmr_inject.o
obj-$(CONFIG_TPS6594_ESM) += tps6594-esm.o
obj-$(CONFIG_TPS6594_PFSM) += tps6594-pfsm.o
+obj-$(CONFIG_NSM) += nsm.o
diff --git a/drivers/misc/eeprom/ee1004.c b/drivers/misc/eeprom/ee1004.c
index a1acd77130f2..fd12ce06a4d5 100644
--- a/drivers/misc/eeprom/ee1004.c
+++ b/drivers/misc/eeprom/ee1004.c
@@ -31,6 +31,7 @@
* over performance.
*/
+#define EE1004_MAX_BUSSES 8
#define EE1004_ADDR_SET_PAGE 0x36
#define EE1004_NUM_PAGES 2
#define EE1004_PAGE_SIZE 256
@@ -42,9 +43,13 @@
* from page selection to end of read.
*/
static DEFINE_MUTEX(ee1004_bus_lock);
-static struct i2c_client *ee1004_set_page[EE1004_NUM_PAGES];
-static unsigned int ee1004_dev_count;
-static int ee1004_current_page;
+
+static struct ee1004_bus_data {
+ struct i2c_adapter *adap;
+ struct i2c_client *set_page[EE1004_NUM_PAGES];
+ unsigned int dev_count;
+ int current_page;
+} ee1004_bus_data[EE1004_MAX_BUSSES];
static const struct i2c_device_id ee1004_ids[] = {
{ "ee1004", 0 },
@@ -54,11 +59,29 @@ MODULE_DEVICE_TABLE(i2c, ee1004_ids);
/*-------------------------------------------------------------------------*/
-static int ee1004_get_current_page(void)
+static struct ee1004_bus_data *ee1004_get_bus_data(struct i2c_adapter *adap)
+{
+ int i;
+
+ for (i = 0; i < EE1004_MAX_BUSSES; i++)
+ if (ee1004_bus_data[i].adap == adap)
+ return ee1004_bus_data + i;
+
+ /* If not existent yet, create new entry */
+ for (i = 0; i < EE1004_MAX_BUSSES; i++)
+ if (!ee1004_bus_data[i].adap) {
+ ee1004_bus_data[i].adap = adap;
+ return ee1004_bus_data + i;
+ }
+
+ return NULL;
+}
+
+static int ee1004_get_current_page(struct ee1004_bus_data *bd)
{
int err;
- err = i2c_smbus_read_byte(ee1004_set_page[0]);
+ err = i2c_smbus_read_byte(bd->set_page[0]);
if (err == -ENXIO) {
/* Nack means page 1 is selected */
return 1;
@@ -72,28 +95,29 @@ static int ee1004_get_current_page(void)
return 0;
}
-static int ee1004_set_current_page(struct device *dev, int page)
+static int ee1004_set_current_page(struct i2c_client *client, int page)
{
+ struct ee1004_bus_data *bd = i2c_get_clientdata(client);
int ret;
- if (page == ee1004_current_page)
+ if (page == bd->current_page)
return 0;
/* Data is ignored */
- ret = i2c_smbus_write_byte(ee1004_set_page[page], 0x00);
+ ret = i2c_smbus_write_byte(bd->set_page[page], 0x00);
/*
* Don't give up just yet. Some memory modules will select the page
* but not ack the command. Check which page is selected now.
*/
- if (ret == -ENXIO && ee1004_get_current_page() == page)
+ if (ret == -ENXIO && ee1004_get_current_page(bd) == page)
ret = 0;
if (ret < 0) {
- dev_err(dev, "Failed to select page %d (%d)\n", page, ret);
+ dev_err(&client->dev, "Failed to select page %d (%d)\n", page, ret);
return ret;
}
- dev_dbg(dev, "Selected page %d\n", page);
- ee1004_current_page = page;
+ dev_dbg(&client->dev, "Selected page %d\n", page);
+ bd->current_page = page;
return 0;
}
@@ -106,7 +130,7 @@ static ssize_t ee1004_eeprom_read(struct i2c_client *client, char *buf,
page = offset >> EE1004_PAGE_SHIFT;
offset &= (1 << EE1004_PAGE_SHIFT) - 1;
- status = ee1004_set_current_page(&client->dev, page);
+ status = ee1004_set_current_page(client, page);
if (status)
return status;
@@ -158,17 +182,18 @@ static struct bin_attribute *ee1004_attrs[] = {
BIN_ATTRIBUTE_GROUPS(ee1004);
-static void ee1004_cleanup(int idx)
+static void ee1004_cleanup(int idx, struct ee1004_bus_data *bd)
{
- if (--ee1004_dev_count == 0)
- while (--idx >= 0) {
- i2c_unregister_device(ee1004_set_page[idx]);
- ee1004_set_page[idx] = NULL;
- }
+ if (--bd->dev_count == 0) {
+ while (--idx >= 0)
+ i2c_unregister_device(bd->set_page[idx]);
+ memset(bd, 0, sizeof(struct ee1004_bus_data));
+ }
}
static int ee1004_probe(struct i2c_client *client)
{
+ struct ee1004_bus_data *bd;
int err, cnr = 0;
/* Make sure we can operate on this adapter */
@@ -178,9 +203,19 @@ static int ee1004_probe(struct i2c_client *client)
I2C_FUNC_SMBUS_BYTE | I2C_FUNC_SMBUS_READ_BYTE_DATA))
return -EPFNOSUPPORT;
- /* Use 2 dummy devices for page select command */
mutex_lock(&ee1004_bus_lock);
- if (++ee1004_dev_count == 1) {
+
+ bd = ee1004_get_bus_data(client->adapter);
+ if (!bd) {
+ mutex_unlock(&ee1004_bus_lock);
+ return dev_err_probe(&client->dev, -ENOSPC,
+ "Only %d busses supported", EE1004_MAX_BUSSES);
+ }
+
+ i2c_set_clientdata(client, bd);
+
+ if (++bd->dev_count == 1) {
+ /* Use 2 dummy devices for page select command */
for (cnr = 0; cnr < EE1004_NUM_PAGES; cnr++) {
struct i2c_client *cl;
@@ -189,20 +224,15 @@ static int ee1004_probe(struct i2c_client *client)
err = PTR_ERR(cl);
goto err_clients;
}
- ee1004_set_page[cnr] = cl;
+ bd->set_page[cnr] = cl;
}
/* Remember current page to avoid unneeded page select */
- err = ee1004_get_current_page();
+ err = ee1004_get_current_page(bd);
if (err < 0)
goto err_clients;
dev_dbg(&client->dev, "Currently selected page: %d\n", err);
- ee1004_current_page = err;
- } else if (client->adapter != ee1004_set_page[0]->adapter) {
- dev_err(&client->dev,
- "Driver only supports devices on a single I2C bus\n");
- err = -EOPNOTSUPP;
- goto err_clients;
+ bd->current_page = err;
}
mutex_unlock(&ee1004_bus_lock);
@@ -213,7 +243,7 @@ static int ee1004_probe(struct i2c_client *client)
return 0;
err_clients:
- ee1004_cleanup(cnr);
+ ee1004_cleanup(cnr, bd);
mutex_unlock(&ee1004_bus_lock);
return err;
@@ -221,9 +251,11 @@ static int ee1004_probe(struct i2c_client *client)
static void ee1004_remove(struct i2c_client *client)
{
+ struct ee1004_bus_data *bd = i2c_get_clientdata(client);
+
/* Remove page select clients if this is the last device */
mutex_lock(&ee1004_bus_lock);
- ee1004_cleanup(EE1004_NUM_PAGES);
+ ee1004_cleanup(EE1004_NUM_PAGES, bd);
mutex_unlock(&ee1004_bus_lock);
}
diff --git a/drivers/misc/mei/Kconfig b/drivers/misc/mei/Kconfig
index 37db142de413..858bd701d68c 100644
--- a/drivers/misc/mei/Kconfig
+++ b/drivers/misc/mei/Kconfig
@@ -60,6 +60,30 @@ config INTEL_MEI_GSC
tasks such as graphics card firmware update and security
tasks.
+config INTEL_MEI_VSC_HW
+ tristate "Intel visual sensing controller device transport driver"
+ depends on ACPI && SPI
+ depends on GPIOLIB || COMPILE_TEST
+ help
+ Intel SPI transport driver between host and Intel visual sensing
+ controller (IVSC) device.
+
+ This driver can also be built as a module. If so, the module
+ will be called mei-vsc-hw.
+
+config INTEL_MEI_VSC
+ tristate "Intel visual sensing controller device with ME interface"
+ depends on INTEL_MEI_VSC_HW
+ depends on INTEL_MEI
+ help
+ Intel MEI over SPI driver for Intel visual sensing controller
+ (IVSC) device embedded in IA platform. It supports camera sharing
+ between IVSC for context sensing and IPU for typical media usage.
+ Select this config should enable transport layer for IVSC device.
+
+ This driver can also be built as a module. If so, the module
+ will be called mei-vsc.
+
source "drivers/misc/mei/hdcp/Kconfig"
source "drivers/misc/mei/pxp/Kconfig"
source "drivers/misc/mei/gsc_proxy/Kconfig"
diff --git a/drivers/misc/mei/Makefile b/drivers/misc/mei/Makefile
index 14aee253ae48..6f9fdbf1a495 100644
--- a/drivers/misc/mei/Makefile
+++ b/drivers/misc/mei/Makefile
@@ -31,3 +31,10 @@ CFLAGS_mei-trace.o = -I$(src)
obj-$(CONFIG_INTEL_MEI_HDCP) += hdcp/
obj-$(CONFIG_INTEL_MEI_PXP) += pxp/
obj-$(CONFIG_INTEL_MEI_GSC_PROXY) += gsc_proxy/
+
+obj-$(CONFIG_INTEL_MEI_VSC_HW) += mei-vsc-hw.o
+mei-vsc-hw-y := vsc-tp.o
+mei-vsc-hw-y += vsc-fw-loader.o
+
+obj-$(CONFIG_INTEL_MEI_VSC) += mei-vsc.o
+mei-vsc-y := platform-vsc.o
diff --git a/drivers/misc/mei/platform-vsc.c b/drivers/misc/mei/platform-vsc.c
new file mode 100644
index 000000000000..8d303c6c0000
--- /dev/null
+++ b/drivers/misc/mei/platform-vsc.c
@@ -0,0 +1,450 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2023, Intel Corporation.
+ * Intel Visual Sensing Controller Interface Linux driver
+ */
+
+#include <linux/align.h>
+#include <linux/cache.h>
+#include <linux/cleanup.h>
+#include <linux/iopoll.h>
+#include <linux/list.h>
+#include <linux/mei.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/overflow.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/timekeeping.h>
+#include <linux/types.h>
+
+#include <asm-generic/bug.h>
+#include <asm-generic/unaligned.h>
+
+#include "mei_dev.h"
+#include "vsc-tp.h"
+
+#define MEI_VSC_DRV_NAME "intel_vsc"
+
+#define MEI_VSC_MAX_MSG_SIZE 512
+
+#define MEI_VSC_POLL_DELAY_US (50 * USEC_PER_MSEC)
+#define MEI_VSC_POLL_TIMEOUT_US (200 * USEC_PER_MSEC)
+
+#define mei_dev_to_vsc_hw(dev) ((struct mei_vsc_hw *)((dev)->hw))
+
+struct mei_vsc_host_timestamp {
+ u64 realtime;
+ u64 boottime;
+};
+
+struct mei_vsc_hw {
+ struct vsc_tp *tp;
+
+ bool fw_ready;
+ bool host_ready;
+
+ atomic_t write_lock_cnt;
+
+ u32 rx_len;
+ u32 rx_hdr;
+
+ /* buffer for tx */
+ char tx_buf[MEI_VSC_MAX_MSG_SIZE + sizeof(struct mei_msg_hdr)] ____cacheline_aligned;
+ /* buffer for rx */
+ char rx_buf[MEI_VSC_MAX_MSG_SIZE + sizeof(struct mei_msg_hdr)] ____cacheline_aligned;
+};
+
+static int mei_vsc_read_helper(struct mei_vsc_hw *hw, u8 *buf,
+ u32 max_len)
+{
+ struct mei_vsc_host_timestamp ts = {
+ .realtime = ktime_to_ns(ktime_get_real()),
+ .boottime = ktime_to_ns(ktime_get_boottime()),
+ };
+
+ return vsc_tp_xfer(hw->tp, VSC_TP_CMD_READ, &ts, sizeof(ts),
+ buf, max_len);
+}
+
+static int mei_vsc_write_helper(struct mei_vsc_hw *hw, u8 *buf, u32 len)
+{
+ u8 status;
+
+ return vsc_tp_xfer(hw->tp, VSC_TP_CMD_WRITE, buf, len, &status,
+ sizeof(status));
+}
+
+static int mei_vsc_fw_status(struct mei_device *mei_dev,
+ struct mei_fw_status *fw_status)
+{
+ if (!fw_status)
+ return -EINVAL;
+
+ fw_status->count = 0;
+
+ return 0;
+}
+
+static inline enum mei_pg_state mei_vsc_pg_state(struct mei_device *mei_dev)
+{
+ return MEI_PG_OFF;
+}
+
+static void mei_vsc_intr_enable(struct mei_device *mei_dev)
+{
+ struct mei_vsc_hw *hw = mei_dev_to_vsc_hw(mei_dev);
+
+ vsc_tp_intr_enable(hw->tp);
+}
+
+static void mei_vsc_intr_disable(struct mei_device *mei_dev)
+{
+ struct mei_vsc_hw *hw = mei_dev_to_vsc_hw(mei_dev);
+
+ vsc_tp_intr_disable(hw->tp);
+}
+
+/* mei framework requires this ops */
+static void mei_vsc_intr_clear(struct mei_device *mei_dev)
+{
+}
+
+/* wait for pending irq handler */
+static void mei_vsc_synchronize_irq(struct mei_device *mei_dev)
+{
+ struct mei_vsc_hw *hw = mei_dev_to_vsc_hw(mei_dev);
+
+ vsc_tp_intr_synchronize(hw->tp);
+}
+
+static int mei_vsc_hw_config(struct mei_device *mei_dev)
+{
+ return 0;
+}
+
+static bool mei_vsc_host_is_ready(struct mei_device *mei_dev)
+{
+ struct mei_vsc_hw *hw = mei_dev_to_vsc_hw(mei_dev);
+
+ return hw->host_ready;
+}
+
+static bool mei_vsc_hw_is_ready(struct mei_device *mei_dev)
+{
+ struct mei_vsc_hw *hw = mei_dev_to_vsc_hw(mei_dev);
+
+ return hw->fw_ready;
+}
+
+static int mei_vsc_hw_start(struct mei_device *mei_dev)
+{
+ struct mei_vsc_hw *hw = mei_dev_to_vsc_hw(mei_dev);
+ int ret, rlen;
+ u8 buf;
+
+ hw->host_ready = true;
+
+ vsc_tp_intr_enable(hw->tp);
+
+ ret = read_poll_timeout(mei_vsc_read_helper, rlen,
+ rlen >= 0, MEI_VSC_POLL_DELAY_US,
+ MEI_VSC_POLL_TIMEOUT_US, true,
+ hw, &buf, sizeof(buf));
+ if (ret) {
+ dev_err(mei_dev->dev, "wait fw ready failed: %d\n", ret);
+ return ret;
+ }
+
+ hw->fw_ready = true;
+
+ return 0;
+}
+
+static bool mei_vsc_hbuf_is_ready(struct mei_device *mei_dev)
+{
+ struct mei_vsc_hw *hw = mei_dev_to_vsc_hw(mei_dev);
+
+ return atomic_read(&hw->write_lock_cnt) == 0;
+}
+
+static int mei_vsc_hbuf_empty_slots(struct mei_device *mei_dev)
+{
+ return MEI_VSC_MAX_MSG_SIZE / MEI_SLOT_SIZE;
+}
+
+static u32 mei_vsc_hbuf_depth(const struct mei_device *mei_dev)
+{
+ return MEI_VSC_MAX_MSG_SIZE / MEI_SLOT_SIZE;
+}
+
+static int mei_vsc_write(struct mei_device *mei_dev,
+ const void *hdr, size_t hdr_len,
+ const void *data, size_t data_len)
+{
+ struct mei_vsc_hw *hw = mei_dev_to_vsc_hw(mei_dev);
+ char *buf = hw->tx_buf;
+ int ret;
+
+ if (WARN_ON(!hdr || !IS_ALIGNED(hdr_len, 4)))
+ return -EINVAL;
+
+ if (!data || data_len > MEI_VSC_MAX_MSG_SIZE)
+ return -EINVAL;
+
+ atomic_inc(&hw->write_lock_cnt);
+
+ memcpy(buf, hdr, hdr_len);
+ memcpy(buf + hdr_len, data, data_len);
+
+ ret = mei_vsc_write_helper(hw, buf, hdr_len + data_len);
+
+ atomic_dec_if_positive(&hw->write_lock_cnt);
+
+ return ret < 0 ? ret : 0;
+}
+
+static inline u32 mei_vsc_read(const struct mei_device *mei_dev)
+{
+ struct mei_vsc_hw *hw = mei_dev_to_vsc_hw(mei_dev);
+ int ret;
+
+ ret = mei_vsc_read_helper(hw, hw->rx_buf, sizeof(hw->rx_buf));
+ if (ret < 0 || ret < sizeof(u32))
+ return 0;
+ hw->rx_len = ret;
+
+ hw->rx_hdr = get_unaligned_le32(hw->rx_buf);
+
+ return hw->rx_hdr;
+}
+
+static int mei_vsc_count_full_read_slots(struct mei_device *mei_dev)
+{
+ return MEI_VSC_MAX_MSG_SIZE / MEI_SLOT_SIZE;
+}
+
+static int mei_vsc_read_slots(struct mei_device *mei_dev, unsigned char *buf,
+ unsigned long len)
+{
+ struct mei_vsc_hw *hw = mei_dev_to_vsc_hw(mei_dev);
+ struct mei_msg_hdr *hdr;
+
+ hdr = (struct mei_msg_hdr *)&hw->rx_hdr;
+ if (len != hdr->length || hdr->length + sizeof(*hdr) != hw->rx_len)
+ return -EINVAL;
+
+ memcpy(buf, hw->rx_buf + sizeof(*hdr), len);
+
+ return 0;
+}
+
+static bool mei_vsc_pg_in_transition(struct mei_device *mei_dev)
+{
+ return mei_dev->pg_event >= MEI_PG_EVENT_WAIT &&
+ mei_dev->pg_event <= MEI_PG_EVENT_INTR_WAIT;
+}
+
+static bool mei_vsc_pg_is_enabled(struct mei_device *mei_dev)
+{
+ return false;
+}
+
+static int mei_vsc_hw_reset(struct mei_device *mei_dev, bool intr_enable)
+{
+ struct mei_vsc_hw *hw = mei_dev_to_vsc_hw(mei_dev);
+
+ vsc_tp_reset(hw->tp);
+
+ vsc_tp_intr_disable(hw->tp);
+
+ return vsc_tp_init(hw->tp, mei_dev->dev);
+}
+
+static const struct mei_hw_ops mei_vsc_hw_ops = {
+ .fw_status = mei_vsc_fw_status,
+ .pg_state = mei_vsc_pg_state,
+
+ .host_is_ready = mei_vsc_host_is_ready,
+ .hw_is_ready = mei_vsc_hw_is_ready,
+ .hw_reset = mei_vsc_hw_reset,
+ .hw_config = mei_vsc_hw_config,
+ .hw_start = mei_vsc_hw_start,
+
+ .pg_in_transition = mei_vsc_pg_in_transition,
+ .pg_is_enabled = mei_vsc_pg_is_enabled,
+
+ .intr_clear = mei_vsc_intr_clear,
+ .intr_enable = mei_vsc_intr_enable,
+ .intr_disable = mei_vsc_intr_disable,
+ .synchronize_irq = mei_vsc_synchronize_irq,
+
+ .hbuf_free_slots = mei_vsc_hbuf_empty_slots,
+ .hbuf_is_ready = mei_vsc_hbuf_is_ready,
+ .hbuf_depth = mei_vsc_hbuf_depth,
+ .write = mei_vsc_write,
+
+ .rdbuf_full_slots = mei_vsc_count_full_read_slots,
+ .read_hdr = mei_vsc_read,
+ .read = mei_vsc_read_slots,
+};
+
+static void mei_vsc_event_cb(void *context)
+{
+ struct mei_device *mei_dev = context;
+ struct mei_vsc_hw *hw = mei_dev_to_vsc_hw(mei_dev);
+ struct list_head cmpl_list;
+ s32 slots;
+ int ret;
+
+ if (mei_dev->dev_state == MEI_DEV_RESETTING ||
+ mei_dev->dev_state == MEI_DEV_INITIALIZING)
+ return;
+
+ INIT_LIST_HEAD(&cmpl_list);
+
+ guard(mutex)(&mei_dev->device_lock);
+
+ while (vsc_tp_need_read(hw->tp)) {
+ /* check slots available for reading */
+ slots = mei_count_full_read_slots(mei_dev);
+
+ ret = mei_irq_read_handler(mei_dev, &cmpl_list, &slots);
+ if (ret) {
+ if (ret != -ENODATA) {
+ if (mei_dev->dev_state != MEI_DEV_RESETTING &&
+ mei_dev->dev_state != MEI_DEV_POWER_DOWN)
+ schedule_work(&mei_dev->reset_work);
+ }
+
+ return;
+ }
+ }
+
+ mei_dev->hbuf_is_ready = mei_hbuf_is_ready(mei_dev);
+ ret = mei_irq_write_handler(mei_dev, &cmpl_list);
+ if (ret)
+ dev_err(mei_dev->dev, "dispatch write request failed: %d\n", ret);
+
+ mei_dev->hbuf_is_ready = mei_hbuf_is_ready(mei_dev);
+ mei_irq_compl_handler(mei_dev, &cmpl_list);
+}
+
+static int mei_vsc_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct mei_device *mei_dev;
+ struct mei_vsc_hw *hw;
+ struct vsc_tp *tp;
+ int ret;
+
+ tp = *(struct vsc_tp **)dev_get_platdata(dev);
+ if (!tp)
+ return dev_err_probe(dev, -ENODEV, "no platform data\n");
+
+ mei_dev = devm_kzalloc(dev, size_add(sizeof(*mei_dev), sizeof(*hw)),
+ GFP_KERNEL);
+ if (!mei_dev)
+ return -ENOMEM;
+
+ mei_device_init(mei_dev, dev, false, &mei_vsc_hw_ops);
+ mei_dev->fw_f_fw_ver_supported = 0;
+ mei_dev->kind = "ivsc";
+
+ hw = mei_dev_to_vsc_hw(mei_dev);
+ atomic_set(&hw->write_lock_cnt, 0);
+ hw->tp = tp;
+
+ platform_set_drvdata(pdev, mei_dev);
+
+ vsc_tp_register_event_cb(tp, mei_vsc_event_cb, mei_dev);
+
+ ret = mei_start(mei_dev);
+ if (ret) {
+ dev_err_probe(dev, ret, "init hw failed\n");
+ goto err_cancel;
+ }
+
+ ret = mei_register(mei_dev, dev);
+ if (ret)
+ goto err_stop;
+
+ pm_runtime_enable(mei_dev->dev);
+
+ return 0;
+
+err_stop:
+ mei_stop(mei_dev);
+
+err_cancel:
+ mei_cancel_work(mei_dev);
+
+ mei_disable_interrupts(mei_dev);
+
+ return ret;
+}
+
+static int mei_vsc_remove(struct platform_device *pdev)
+{
+ struct mei_device *mei_dev = platform_get_drvdata(pdev);
+
+ pm_runtime_disable(mei_dev->dev);
+
+ mei_stop(mei_dev);
+
+ mei_disable_interrupts(mei_dev);
+
+ mei_deregister(mei_dev);
+
+ return 0;
+}
+
+static int mei_vsc_suspend(struct device *dev)
+{
+ struct mei_device *mei_dev = dev_get_drvdata(dev);
+
+ mei_stop(mei_dev);
+
+ return 0;
+}
+
+static int mei_vsc_resume(struct device *dev)
+{
+ struct mei_device *mei_dev = dev_get_drvdata(dev);
+ int ret;
+
+ ret = mei_restart(mei_dev);
+ if (ret)
+ return ret;
+
+ /* start timer if stopped in suspend */
+ schedule_delayed_work(&mei_dev->timer_work, HZ);
+
+ return 0;
+}
+
+static DEFINE_SIMPLE_DEV_PM_OPS(mei_vsc_pm_ops, mei_vsc_suspend, mei_vsc_resume);
+
+static const struct platform_device_id mei_vsc_id_table[] = {
+ { MEI_VSC_DRV_NAME },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(platform, mei_vsc_id_table);
+
+static struct platform_driver mei_vsc_drv = {
+ .probe = mei_vsc_probe,
+ .remove = mei_vsc_remove,
+ .id_table = mei_vsc_id_table,
+ .driver = {
+ .name = MEI_VSC_DRV_NAME,
+ .pm = &mei_vsc_pm_ops,
+ .probe_type = PROBE_PREFER_ASYNCHRONOUS,
+ },
+};
+module_platform_driver(mei_vsc_drv);
+
+MODULE_AUTHOR("Wentong Wu <wentong.wu@intel.com>");
+MODULE_AUTHOR("Zhifeng Wang <zhifeng.wang@intel.com>");
+MODULE_DESCRIPTION("Intel Visual Sensing Controller Interface");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(VSC_TP);
diff --git a/drivers/misc/mei/vsc-fw-loader.c b/drivers/misc/mei/vsc-fw-loader.c
new file mode 100644
index 000000000000..3e151f06e85b
--- /dev/null
+++ b/drivers/misc/mei/vsc-fw-loader.c
@@ -0,0 +1,822 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2023, Intel Corporation.
+ * Intel Visual Sensing Controller Transport Layer Linux driver
+ */
+
+#include <linux/acpi.h>
+#include <linux/align.h>
+#include <linux/bitfield.h>
+#include <linux/bits.h>
+#include <linux/cleanup.h>
+#include <linux/firmware.h>
+#include <linux/sizes.h>
+#include <linux/slab.h>
+#include <linux/string_helpers.h>
+#include <linux/types.h>
+
+#include <asm-generic/unaligned.h>
+
+#include "vsc-tp.h"
+
+#define VSC_MAGIC_NUM 0x49505343 /* IPSC */
+#define VSC_MAGIC_FW 0x49574653 /* IWFS */
+#define VSC_MAGIC_FILE 0x46564353 /* FVCS */
+
+#define VSC_ADDR_BASE 0xE0030000
+#define VSC_EFUSE_ADDR (VSC_ADDR_BASE + 0x038)
+#define VSC_STRAP_ADDR (VSC_ADDR_BASE + 0x100)
+
+#define VSC_STRAP_KEY_SRC_MASK BIT(0)
+#define VSC_STRAP_KEY_SRC_PRODUCT 1
+
+#define VSC_MAINSTEPPING_VERSION_MASK GENMASK(7, 4)
+#define VSC_MAINSTEPPING_VERSION_A 0
+
+#define VSC_SUBSTEPPING_VERSION_MASK GENMASK(3, 0)
+#define VSC_SUBSTEPPING_VERSION_0 0
+#define VSC_SUBSTEPPING_VERSION_1 2
+
+#define VSC_BOOT_IMG_OPTION_MASK GENMASK(15, 0)
+
+#define VSC_SKU_CFG_LOCATION 0x5001A000
+#define VSC_SKU_MAX_SIZE 4100u
+
+#define VSC_ACE_IMG_CNT 2
+#define VSC_CSI_IMG_CNT 4
+#define VSC_IMG_CNT_MAX 6
+
+#define VSC_ROM_PKG_SIZE 256u
+#define VSC_FW_PKG_SIZE 512u
+
+#define VSC_CSI_IMAGE_NAME_FMT "ivsc_fw_a1.bin"
+#define VSC_CSI_IMAGE_NAME_FMT_PROD "ivsc_fw_a1_%s.bin"
+#define VSC_ACE_IMAGE_NAME_FMT "ivsc_pkg_%s_0_a1.bin"
+#define VSC_ACE_IMAGE_NAME_FMT_PROD "ivsc_pkg_%s_0_a1_%s.bin"
+#define VSC_CFG_IMAGE_NAME_FMT "ivsc_skucfg_%s_0_1_a1.bin"
+#define VSC_CFG_IMAGE_NAME_FMT_PROD "ivsc_skucfg_%s_0_1_a1_%s.bin"
+
+#define VSC_IMAGE_FOLDER_FMT "vsc/soc_a1"
+#define VSC_IMAGE_FOLDER_FMT_PROD "vsc/soc_a1_%s"
+
+#define VSC_IMAGE_NAME_MAX_LEN 64
+#define VSC_IMAGE_PATH_MAX_LEN 128
+
+#define VSC_SENSOR_NAME_MAX_LEN 16
+#define VSC_IMAGE_FOLDER_NAME_MAX_LEN 32
+#define VSC_IMAGE_NAME_SUFFIX_MAX_LEN 8
+
+/* command id */
+enum {
+ VSC_CMD_QUERY = 0,
+ VSC_CMD_DL_SET = 1,
+ VSC_CMD_DL_START = 2,
+ VSC_CMD_DL_CONT = 3,
+ VSC_CMD_DUMP_MEM = 4,
+ VSC_CMD_GET_CONT = 8,
+ VSC_CMD_CAM_BOOT = 10,
+};
+
+/* command ack token */
+enum {
+ VSC_TOKEN_BOOTLOADER_REQ = 1,
+ VSC_TOKEN_DUMP_RESP = 4,
+ VSC_TOKEN_ERROR = 7,
+};
+
+/* image type */
+enum {
+ VSC_IMG_BOOTLOADER_TYPE = 1,
+ VSC_IMG_CSI_EM7D_TYPE,
+ VSC_IMG_CSI_SEM_TYPE,
+ VSC_IMG_CSI_RUNTIME_TYPE,
+ VSC_IMG_ACE_VISION_TYPE,
+ VSC_IMG_ACE_CFG_TYPE,
+ VSC_IMG_SKU_CFG_TYPE,
+};
+
+/* image fragments */
+enum {
+ VSC_IMG_BOOTLOADER_FRAG,
+ VSC_IMG_CSI_SEM_FRAG,
+ VSC_IMG_CSI_RUNTIME_FRAG,
+ VSC_IMG_ACE_VISION_FRAG,
+ VSC_IMG_ACE_CFG_FRAG,
+ VSC_IMG_CSI_EM7D_FRAG,
+ VSC_IMG_SKU_CFG_FRAG,
+ VSC_IMG_FRAG_MAX
+};
+
+struct vsc_rom_cmd {
+ __le32 magic;
+ __u8 cmd_id;
+ union {
+ /* download start */
+ struct {
+ __u8 img_type;
+ __le16 option;
+ __le32 img_len;
+ __le32 img_loc;
+ __le32 crc;
+ DECLARE_FLEX_ARRAY(__u8, res);
+ } __packed dl_start;
+ /* download set */
+ struct {
+ __u8 option;
+ __le16 img_cnt;
+ DECLARE_FLEX_ARRAY(__le32, payload);
+ } __packed dl_set;
+ /* download continue */
+ struct {
+ __u8 end_flag;
+ __le16 len;
+ /* 8 is the offset of payload */
+ __u8 payload[VSC_ROM_PKG_SIZE - 8];
+ } __packed dl_cont;
+ /* dump memory */
+ struct {
+ __u8 res;
+ __le16 len;
+ __le32 addr;
+ DECLARE_FLEX_ARRAY(__u8, payload);
+ } __packed dump_mem;
+ /* 5 is the offset of padding */
+ __u8 padding[VSC_ROM_PKG_SIZE - 5];
+ } data;
+};
+
+struct vsc_rom_cmd_ack {
+ __le32 magic;
+ __u8 token;
+ __u8 type;
+ __u8 res[2];
+ __u8 payload[];
+};
+
+struct vsc_fw_cmd {
+ __le32 magic;
+ __u8 cmd_id;
+ union {
+ struct {
+ __le16 option;
+ __u8 img_type;
+ __le32 img_len;
+ __le32 img_loc;
+ __le32 crc;
+ DECLARE_FLEX_ARRAY(__u8, res);
+ } __packed dl_start;
+ struct {
+ __le16 option;
+ __u8 img_cnt;
+ DECLARE_FLEX_ARRAY(__le32, payload);
+ } __packed dl_set;
+ struct {
+ __le32 addr;
+ __u8 len;
+ DECLARE_FLEX_ARRAY(__u8, payload);
+ } __packed dump_mem;
+ struct {
+ __u8 resv[3];
+ __le32 crc;
+ DECLARE_FLEX_ARRAY(__u8, payload);
+ } __packed boot;
+ /* 5 is the offset of padding */
+ __u8 padding[VSC_FW_PKG_SIZE - 5];
+ } data;
+};
+
+struct vsc_img {
+ __le32 magic;
+ __le32 option;
+ __le32 image_count;
+ __le32 image_location[VSC_IMG_CNT_MAX];
+};
+
+struct vsc_fw_sign {
+ __le32 magic;
+ __le32 image_size;
+ __u8 image[];
+};
+
+struct vsc_image_code_data {
+ /* fragment index */
+ u8 frag_index;
+ /* image type */
+ u8 image_type;
+};
+
+struct vsc_img_frag {
+ u8 type;
+ u32 location;
+ const u8 *data;
+ u32 size;
+};
+
+/**
+ * struct vsc_fw_loader - represent vsc firmware loader
+ * @dev: device used to request fimware
+ * @tp: transport layer used with the firmware loader
+ * @csi: CSI image
+ * @ace: ACE image
+ * @cfg: config image
+ * @tx_buf: tx buffer
+ * @rx_buf: rx buffer
+ * @option: command option
+ * @count: total image count
+ * @key_src: key source
+ * @folder: image folder
+ * @sensor_name: camera sensor name
+ * @suffix: image name suffix
+ * @frags: image fragments
+ */
+struct vsc_fw_loader {
+ struct device *dev;
+ struct vsc_tp *tp;
+
+ const struct firmware *csi;
+ const struct firmware *ace;
+ const struct firmware *cfg;
+
+ void *tx_buf;
+ void *rx_buf;
+
+ u16 option;
+ u16 count;
+ u32 key_src;
+
+ char folder[VSC_IMAGE_FOLDER_NAME_MAX_LEN];
+ char sensor_name[VSC_SENSOR_NAME_MAX_LEN];
+ char suffix[VSC_IMAGE_NAME_SUFFIX_MAX_LEN];
+
+ struct vsc_img_frag frags[VSC_IMG_FRAG_MAX];
+};
+
+static inline u32 vsc_sum_crc(void *data, size_t size)
+{
+ u32 crc = 0;
+ size_t i;
+
+ for (i = 0; i < size; i++)
+ crc += *((u8 *)data + i);
+
+ return crc;
+}
+
+/* get sensor name to construct image name */
+static int vsc_get_sensor_name(struct vsc_fw_loader *fw_loader,
+ struct device *dev)
+{
+ struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER };
+ union acpi_object obj = {
+ .type = ACPI_TYPE_INTEGER,
+ .integer.value = 1,
+ };
+ struct acpi_object_list arg_list = {
+ .count = 1,
+ .pointer = &obj,
+ };
+ union acpi_object *ret_obj;
+ acpi_handle handle;
+ acpi_status status;
+ int ret = 0;
+
+ handle = ACPI_HANDLE(dev);
+ if (!handle)
+ return -EINVAL;
+
+ status = acpi_evaluate_object(handle, "SID", &arg_list, &buffer);
+ if (ACPI_FAILURE(status)) {
+ dev_err(dev, "can't evaluate SID method: %d\n", status);
+ return -ENODEV;
+ }
+
+ ret_obj = buffer.pointer;
+ if (!ret_obj) {
+ dev_err(dev, "can't locate ACPI buffer\n");
+ return -ENODEV;
+ }
+
+ if (ret_obj->type != ACPI_TYPE_STRING) {
+ dev_err(dev, "found non-string entry\n");
+ ret = -ENODEV;
+ goto out_free_buff;
+ }
+
+ /* string length excludes trailing NUL */
+ if (ret_obj->string.length >= sizeof(fw_loader->sensor_name)) {
+ dev_err(dev, "sensor name buffer too small\n");
+ ret = -EINVAL;
+ goto out_free_buff;
+ }
+
+ memcpy(fw_loader->sensor_name, ret_obj->string.pointer,
+ ret_obj->string.length);
+
+ string_lower(fw_loader->sensor_name, fw_loader->sensor_name);
+
+out_free_buff:
+ ACPI_FREE(buffer.pointer);
+
+ return ret;
+}
+
+static int vsc_identify_silicon(struct vsc_fw_loader *fw_loader)
+{
+ struct vsc_rom_cmd_ack *ack = fw_loader->rx_buf;
+ struct vsc_rom_cmd *cmd = fw_loader->tx_buf;
+ u8 version, sub_version;
+ int ret;
+
+ /* identify stepping information */
+ cmd->magic = cpu_to_le32(VSC_MAGIC_NUM);
+ cmd->cmd_id = VSC_CMD_DUMP_MEM;
+ cmd->data.dump_mem.addr = cpu_to_le32(VSC_EFUSE_ADDR);
+ cmd->data.dump_mem.len = cpu_to_le16(sizeof(__le32));
+ ret = vsc_tp_rom_xfer(fw_loader->tp, cmd, ack, VSC_ROM_PKG_SIZE);
+ if (ret)
+ return ret;
+ if (ack->token == VSC_TOKEN_ERROR)
+ return -EINVAL;
+
+ cmd->magic = cpu_to_le32(VSC_MAGIC_NUM);
+ cmd->cmd_id = VSC_CMD_GET_CONT;
+ ret = vsc_tp_rom_xfer(fw_loader->tp, cmd, ack, VSC_ROM_PKG_SIZE);
+ if (ret)
+ return ret;
+ if (ack->token != VSC_TOKEN_DUMP_RESP)
+ return -EINVAL;
+
+ version = FIELD_GET(VSC_MAINSTEPPING_VERSION_MASK, ack->payload[0]);
+ sub_version = FIELD_GET(VSC_SUBSTEPPING_VERSION_MASK, ack->payload[0]);
+
+ if (version != VSC_MAINSTEPPING_VERSION_A)
+ return -EINVAL;
+
+ if (sub_version != VSC_SUBSTEPPING_VERSION_0 &&
+ sub_version != VSC_SUBSTEPPING_VERSION_1)
+ return -EINVAL;
+
+ dev_info(fw_loader->dev, "silicon stepping version is %u:%u\n",
+ version, sub_version);
+
+ /* identify strap information */
+ cmd->magic = cpu_to_le32(VSC_MAGIC_NUM);
+ cmd->cmd_id = VSC_CMD_DUMP_MEM;
+ cmd->data.dump_mem.addr = cpu_to_le32(VSC_STRAP_ADDR);
+ cmd->data.dump_mem.len = cpu_to_le16(sizeof(__le32));
+ ret = vsc_tp_rom_xfer(fw_loader->tp, cmd, ack, VSC_ROM_PKG_SIZE);
+ if (ret)
+ return ret;
+ if (ack->token == VSC_TOKEN_ERROR)
+ return -EINVAL;
+
+ cmd->magic = cpu_to_le32(VSC_MAGIC_NUM);
+ cmd->cmd_id = VSC_CMD_GET_CONT;
+ ret = vsc_tp_rom_xfer(fw_loader->tp, cmd, ack, VSC_ROM_PKG_SIZE);
+ if (ret)
+ return ret;
+ if (ack->token != VSC_TOKEN_DUMP_RESP)
+ return -EINVAL;
+
+ fw_loader->key_src = FIELD_GET(VSC_STRAP_KEY_SRC_MASK, ack->payload[2]);
+
+ if (fw_loader->key_src == VSC_STRAP_KEY_SRC_PRODUCT)
+ strscpy(fw_loader->suffix, "prod", sizeof(fw_loader->suffix));
+
+ return 0;
+}
+
+static int vsc_identify_csi_image(struct vsc_fw_loader *fw_loader)
+{
+ char path[VSC_IMAGE_PATH_MAX_LEN];
+ char name[VSC_IMAGE_NAME_MAX_LEN];
+ const struct firmware *image;
+ struct vsc_fw_sign *sign;
+ struct vsc_img *img;
+ unsigned int i;
+ int ret;
+
+ if (fw_loader->key_src == VSC_STRAP_KEY_SRC_PRODUCT)
+ snprintf(name, sizeof(name), VSC_CSI_IMAGE_NAME_FMT_PROD,
+ fw_loader->suffix);
+ else
+ snprintf(name, sizeof(name), VSC_CSI_IMAGE_NAME_FMT);
+
+ snprintf(path, sizeof(path), "%s/%s", fw_loader->folder, name);
+
+ ret = request_firmware(&image, path, fw_loader->dev);
+ if (ret)
+ return ret;
+
+ img = (struct vsc_img *)image->data;
+ if (!img) {
+ ret = -ENOENT;
+ goto err_release_image;
+ }
+
+ if (le32_to_cpu(img->magic) != VSC_MAGIC_FILE) {
+ ret = -EINVAL;
+ goto err_release_image;
+ }
+
+ if (le32_to_cpu(img->image_count) != VSC_CSI_IMG_CNT) {
+ ret = -EINVAL;
+ goto err_release_image;
+ }
+ fw_loader->count += le32_to_cpu(img->image_count) - 1;
+
+ fw_loader->option =
+ FIELD_GET(VSC_BOOT_IMG_OPTION_MASK, le32_to_cpu(img->option));
+
+ sign = (struct vsc_fw_sign *)
+ (img->image_location + le32_to_cpu(img->image_count));
+
+ for (i = 0; i < VSC_CSI_IMG_CNT; i++) {
+ /* mapping from CSI image index to image code data */
+ static const struct vsc_image_code_data csi_image_map[] = {
+ { VSC_IMG_BOOTLOADER_FRAG, VSC_IMG_BOOTLOADER_TYPE },
+ { VSC_IMG_CSI_SEM_FRAG, VSC_IMG_CSI_SEM_TYPE },
+ { VSC_IMG_CSI_RUNTIME_FRAG, VSC_IMG_CSI_RUNTIME_TYPE },
+ { VSC_IMG_CSI_EM7D_FRAG, VSC_IMG_CSI_EM7D_TYPE },
+ };
+ struct vsc_img_frag *frag;
+
+ if ((u8 *)sign + sizeof(*sign) > image->data + image->size) {
+ ret = -EINVAL;
+ goto err_release_image;
+ }
+
+ if (le32_to_cpu(sign->magic) != VSC_MAGIC_FW) {
+ ret = -EINVAL;
+ goto err_release_image;
+ }
+
+ if (!le32_to_cpu(img->image_location[i])) {
+ ret = -EINVAL;
+ goto err_release_image;
+ }
+
+ frag = &fw_loader->frags[csi_image_map[i].frag_index];
+
+ frag->data = sign->image;
+ frag->size = le32_to_cpu(sign->image_size);
+ frag->location = le32_to_cpu(img->image_location[i]);
+ frag->type = csi_image_map[i].image_type;
+
+ sign = (struct vsc_fw_sign *)
+ (sign->image + le32_to_cpu(sign->image_size));
+ }
+
+ fw_loader->csi = image;
+
+ return 0;
+
+err_release_image:
+ release_firmware(image);
+
+ return ret;
+}
+
+static int vsc_identify_ace_image(struct vsc_fw_loader *fw_loader)
+{
+ char path[VSC_IMAGE_PATH_MAX_LEN];
+ char name[VSC_IMAGE_NAME_MAX_LEN];
+ const struct firmware *image;
+ struct vsc_fw_sign *sign;
+ struct vsc_img *img;
+ unsigned int i;
+ int ret;
+
+ if (fw_loader->key_src == VSC_STRAP_KEY_SRC_PRODUCT)
+ snprintf(name, sizeof(name), VSC_ACE_IMAGE_NAME_FMT_PROD,
+ fw_loader->sensor_name, fw_loader->suffix);
+ else
+ snprintf(name, sizeof(name), VSC_ACE_IMAGE_NAME_FMT,
+ fw_loader->sensor_name);
+
+ snprintf(path, sizeof(path), "%s/%s", fw_loader->folder, name);
+
+ ret = request_firmware(&image, path, fw_loader->dev);
+ if (ret)
+ return ret;
+
+ img = (struct vsc_img *)image->data;
+ if (!img) {
+ ret = -ENOENT;
+ goto err_release_image;
+ }
+
+ if (le32_to_cpu(img->magic) != VSC_MAGIC_FILE) {
+ ret = -EINVAL;
+ goto err_release_image;
+ }
+
+ if (le32_to_cpu(img->image_count) != VSC_ACE_IMG_CNT) {
+ ret = -EINVAL;
+ goto err_release_image;
+ }
+ fw_loader->count += le32_to_cpu(img->image_count);
+
+ sign = (struct vsc_fw_sign *)
+ (img->image_location + le32_to_cpu(img->image_count));
+
+ for (i = 0; i < VSC_ACE_IMG_CNT; i++) {
+ /* mapping from ACE image index to image code data */
+ static const struct vsc_image_code_data ace_image_map[] = {
+ { VSC_IMG_ACE_VISION_FRAG, VSC_IMG_ACE_VISION_TYPE },
+ { VSC_IMG_ACE_CFG_FRAG, VSC_IMG_ACE_CFG_TYPE },
+ };
+ struct vsc_img_frag *frag, *last_frag;
+ u8 frag_index;
+
+ if ((u8 *)sign + sizeof(*sign) > image->data + image->size) {
+ ret = -EINVAL;
+ goto err_release_image;
+ }
+
+ if (le32_to_cpu(sign->magic) != VSC_MAGIC_FW) {
+ ret = -EINVAL;
+ goto err_release_image;
+ }
+
+ frag_index = ace_image_map[i].frag_index;
+ frag = &fw_loader->frags[frag_index];
+
+ frag->data = sign->image;
+ frag->size = le32_to_cpu(sign->image_size);
+ frag->location = le32_to_cpu(img->image_location[i]);
+ frag->type = ace_image_map[i].image_type;
+
+ if (!frag->location) {
+ last_frag = &fw_loader->frags[frag_index - 1];
+ frag->location =
+ ALIGN(last_frag->location + last_frag->size, SZ_4K);
+ }
+
+ sign = (struct vsc_fw_sign *)
+ (sign->image + le32_to_cpu(sign->image_size));
+ }
+
+ fw_loader->ace = image;
+
+ return 0;
+
+err_release_image:
+ release_firmware(image);
+
+ return ret;
+}
+
+static int vsc_identify_cfg_image(struct vsc_fw_loader *fw_loader)
+{
+ struct vsc_img_frag *frag = &fw_loader->frags[VSC_IMG_SKU_CFG_FRAG];
+ char path[VSC_IMAGE_PATH_MAX_LEN];
+ char name[VSC_IMAGE_NAME_MAX_LEN];
+ const struct firmware *image;
+ u32 size;
+ int ret;
+
+ if (fw_loader->key_src == VSC_STRAP_KEY_SRC_PRODUCT)
+ snprintf(name, sizeof(name), VSC_CFG_IMAGE_NAME_FMT_PROD,
+ fw_loader->sensor_name, fw_loader->suffix);
+ else
+ snprintf(name, sizeof(name), VSC_CFG_IMAGE_NAME_FMT,
+ fw_loader->sensor_name);
+
+ snprintf(path, sizeof(path), "%s/%s", fw_loader->folder, name);
+
+ ret = request_firmware(&image, path, fw_loader->dev);
+ if (ret)
+ return ret;
+
+ /* identify image size */
+ if (image->size <= sizeof(u32) || image->size > VSC_SKU_MAX_SIZE) {
+ ret = -EINVAL;
+ goto err_release_image;
+ }
+
+ size = le32_to_cpu(*((__le32 *)image->data)) + sizeof(u32);
+ if (image->size != size) {
+ ret = -EINVAL;
+ goto err_release_image;
+ }
+
+ frag->data = image->data;
+ frag->size = image->size;
+ frag->type = VSC_IMG_SKU_CFG_TYPE;
+ frag->location = VSC_SKU_CFG_LOCATION;
+
+ fw_loader->cfg = image;
+
+ return 0;
+
+err_release_image:
+ release_firmware(image);
+
+ return ret;
+}
+
+static int vsc_download_bootloader(struct vsc_fw_loader *fw_loader)
+{
+ struct vsc_img_frag *frag = &fw_loader->frags[VSC_IMG_BOOTLOADER_FRAG];
+ struct vsc_rom_cmd_ack *ack = fw_loader->rx_buf;
+ struct vsc_rom_cmd *cmd = fw_loader->tx_buf;
+ u32 len, c_len;
+ size_t remain;
+ const u8 *p;
+ int ret;
+
+ cmd->magic = cpu_to_le32(VSC_MAGIC_NUM);
+ cmd->cmd_id = VSC_CMD_QUERY;
+ ret = vsc_tp_rom_xfer(fw_loader->tp, cmd, ack, VSC_ROM_PKG_SIZE);
+ if (ret)
+ return ret;
+ if (ack->token != VSC_TOKEN_DUMP_RESP &&
+ ack->token != VSC_TOKEN_BOOTLOADER_REQ)
+ return -EINVAL;
+
+ cmd->magic = cpu_to_le32(VSC_MAGIC_NUM);
+ cmd->cmd_id = VSC_CMD_DL_START;
+ cmd->data.dl_start.option = cpu_to_le16(fw_loader->option);
+ cmd->data.dl_start.img_type = frag->type;
+ cmd->data.dl_start.img_len = cpu_to_le32(frag->size);
+ cmd->data.dl_start.img_loc = cpu_to_le32(frag->location);
+
+ c_len = offsetof(struct vsc_rom_cmd, data.dl_start.crc);
+ cmd->data.dl_start.crc = cpu_to_le32(vsc_sum_crc(cmd, c_len));
+
+ ret = vsc_tp_rom_xfer(fw_loader->tp, cmd, NULL, VSC_ROM_PKG_SIZE);
+ if (ret)
+ return ret;
+
+ p = frag->data;
+ remain = frag->size;
+
+ /* download image data */
+ while (remain > 0) {
+ len = min(remain, sizeof(cmd->data.dl_cont.payload));
+
+ cmd->magic = cpu_to_le32(VSC_MAGIC_NUM);
+ cmd->cmd_id = VSC_CMD_DL_CONT;
+ cmd->data.dl_cont.len = cpu_to_le16(len);
+ cmd->data.dl_cont.end_flag = remain == len;
+ memcpy(cmd->data.dl_cont.payload, p, len);
+
+ ret = vsc_tp_rom_xfer(fw_loader->tp, cmd, NULL, VSC_ROM_PKG_SIZE);
+ if (ret)
+ return ret;
+
+ p += len;
+ remain -= len;
+ }
+
+ return 0;
+}
+
+static int vsc_download_firmware(struct vsc_fw_loader *fw_loader)
+{
+ struct vsc_fw_cmd *cmd = fw_loader->tx_buf;
+ unsigned int i, index = 0;
+ u32 c_len;
+ int ret;
+
+ cmd->magic = cpu_to_le32(VSC_MAGIC_NUM);
+ cmd->cmd_id = VSC_CMD_DL_SET;
+ cmd->data.dl_set.img_cnt = cpu_to_le16(fw_loader->count);
+ put_unaligned_le16(fw_loader->option, &cmd->data.dl_set.option);
+
+ for (i = VSC_IMG_CSI_SEM_FRAG; i <= VSC_IMG_CSI_EM7D_FRAG; i++) {
+ struct vsc_img_frag *frag = &fw_loader->frags[i];
+
+ cmd->data.dl_set.payload[index++] = cpu_to_le32(frag->location);
+ cmd->data.dl_set.payload[index++] = cpu_to_le32(frag->size);
+ }
+
+ c_len = offsetof(struct vsc_fw_cmd, data.dl_set.payload[index]);
+ cmd->data.dl_set.payload[index] = cpu_to_le32(vsc_sum_crc(cmd, c_len));
+
+ ret = vsc_tp_rom_xfer(fw_loader->tp, cmd, NULL, VSC_FW_PKG_SIZE);
+ if (ret)
+ return ret;
+
+ for (i = VSC_IMG_CSI_SEM_FRAG; i < VSC_IMG_FRAG_MAX; i++) {
+ struct vsc_img_frag *frag = &fw_loader->frags[i];
+ const u8 *p;
+ u32 remain;
+
+ cmd->magic = cpu_to_le32(VSC_MAGIC_NUM);
+ cmd->cmd_id = VSC_CMD_DL_START;
+ cmd->data.dl_start.img_type = frag->type;
+ cmd->data.dl_start.img_len = cpu_to_le32(frag->size);
+ cmd->data.dl_start.img_loc = cpu_to_le32(frag->location);
+ put_unaligned_le16(fw_loader->option, &cmd->data.dl_start.option);
+
+ c_len = offsetof(struct vsc_fw_cmd, data.dl_start.crc);
+ cmd->data.dl_start.crc = cpu_to_le32(vsc_sum_crc(cmd, c_len));
+
+ ret = vsc_tp_rom_xfer(fw_loader->tp, cmd, NULL, VSC_FW_PKG_SIZE);
+ if (ret)
+ return ret;
+
+ p = frag->data;
+ remain = frag->size;
+
+ /* download image data */
+ while (remain > 0) {
+ u32 len = min(remain, VSC_FW_PKG_SIZE);
+
+ memcpy(fw_loader->tx_buf, p, len);
+ memset(fw_loader->tx_buf + len, 0, VSC_FW_PKG_SIZE - len);
+
+ ret = vsc_tp_rom_xfer(fw_loader->tp, fw_loader->tx_buf,
+ NULL, VSC_FW_PKG_SIZE);
+ if (ret)
+ break;
+
+ p += len;
+ remain -= len;
+ }
+ }
+
+ cmd->magic = cpu_to_le32(VSC_MAGIC_NUM);
+ cmd->cmd_id = VSC_CMD_CAM_BOOT;
+
+ c_len = offsetof(struct vsc_fw_cmd, data.dl_start.crc);
+ cmd->data.boot.crc = cpu_to_le32(vsc_sum_crc(cmd, c_len));
+
+ return vsc_tp_rom_xfer(fw_loader->tp, cmd, NULL, VSC_FW_PKG_SIZE);
+}
+
+/**
+ * vsc_tp_init - init vsc_tp
+ * @tp: vsc_tp device handle
+ * @dev: device node for mei vsc device
+ * Return: 0 in case of success, negative value in case of error
+ */
+int vsc_tp_init(struct vsc_tp *tp, struct device *dev)
+{
+ struct vsc_fw_loader *fw_loader __free(kfree) = NULL;
+ void *tx_buf __free(kfree) = NULL;
+ void *rx_buf __free(kfree) = NULL;
+ int ret;
+
+ fw_loader = kzalloc(sizeof(*fw_loader), GFP_KERNEL);
+ if (!fw_loader)
+ return -ENOMEM;
+
+ tx_buf = kzalloc(VSC_FW_PKG_SIZE, GFP_KERNEL);
+ if (!tx_buf)
+ return -ENOMEM;
+
+ rx_buf = kzalloc(VSC_FW_PKG_SIZE, GFP_KERNEL);
+ if (!rx_buf)
+ return -ENOMEM;
+
+ fw_loader->tx_buf = tx_buf;
+ fw_loader->rx_buf = rx_buf;
+
+ fw_loader->tp = tp;
+ fw_loader->dev = dev;
+
+ ret = vsc_get_sensor_name(fw_loader, dev);
+ if (ret)
+ return ret;
+
+ ret = vsc_identify_silicon(fw_loader);
+ if (ret)
+ return ret;
+
+ if (fw_loader->key_src == VSC_STRAP_KEY_SRC_PRODUCT)
+ snprintf(fw_loader->folder, sizeof(fw_loader->folder),
+ VSC_IMAGE_FOLDER_FMT_PROD, fw_loader->suffix);
+ else
+ snprintf(fw_loader->folder, sizeof(fw_loader->folder),
+ VSC_IMAGE_FOLDER_FMT);
+
+ ret = vsc_identify_csi_image(fw_loader);
+ if (ret)
+ return ret;
+
+ ret = vsc_identify_ace_image(fw_loader);
+ if (ret)
+ goto err_release_csi;
+
+ ret = vsc_identify_cfg_image(fw_loader);
+ if (ret)
+ goto err_release_ace;
+
+ ret = vsc_download_bootloader(fw_loader);
+ if (!ret)
+ ret = vsc_download_firmware(fw_loader);
+
+ release_firmware(fw_loader->cfg);
+
+err_release_ace:
+ release_firmware(fw_loader->ace);
+
+err_release_csi:
+ release_firmware(fw_loader->csi);
+
+ return ret;
+}
+EXPORT_SYMBOL_NS_GPL(vsc_tp_init, VSC_TP);
diff --git a/drivers/misc/mei/vsc-tp.c b/drivers/misc/mei/vsc-tp.c
new file mode 100644
index 000000000000..6f4a4be6ccb5
--- /dev/null
+++ b/drivers/misc/mei/vsc-tp.c
@@ -0,0 +1,555 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2023, Intel Corporation.
+ * Intel Visual Sensing Controller Transport Layer Linux driver
+ */
+
+#include <linux/acpi.h>
+#include <linux/cleanup.h>
+#include <linux/crc32.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/interrupt.h>
+#include <linux/iopoll.h>
+#include <linux/irq.h>
+#include <linux/irqreturn.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/platform_device.h>
+#include <linux/spi/spi.h>
+#include <linux/types.h>
+
+#include "vsc-tp.h"
+
+#define VSC_TP_RESET_PIN_TOGGLE_INTERVAL_MS 20
+#define VSC_TP_ROM_BOOTUP_DELAY_MS 10
+#define VSC_TP_ROM_XFER_POLL_TIMEOUT_US (500 * USEC_PER_MSEC)
+#define VSC_TP_ROM_XFER_POLL_DELAY_US (20 * USEC_PER_MSEC)
+#define VSC_TP_WAIT_FW_ASSERTED_TIMEOUT (2 * HZ)
+#define VSC_TP_MAX_XFER_COUNT 5
+
+#define VSC_TP_PACKET_SYNC 0x31
+#define VSC_TP_CRC_SIZE sizeof(u32)
+#define VSC_TP_MAX_MSG_SIZE 2048
+/* SPI xfer timeout size */
+#define VSC_TP_XFER_TIMEOUT_BYTES 700
+#define VSC_TP_PACKET_PADDING_SIZE 1
+#define VSC_TP_PACKET_SIZE(pkt) \
+ (sizeof(struct vsc_tp_packet) + le16_to_cpu((pkt)->len) + VSC_TP_CRC_SIZE)
+#define VSC_TP_MAX_PACKET_SIZE \
+ (sizeof(struct vsc_tp_packet) + VSC_TP_MAX_MSG_SIZE + VSC_TP_CRC_SIZE)
+#define VSC_TP_MAX_XFER_SIZE \
+ (VSC_TP_MAX_PACKET_SIZE + VSC_TP_XFER_TIMEOUT_BYTES)
+#define VSC_TP_NEXT_XFER_LEN(len, offset) \
+ (len + sizeof(struct vsc_tp_packet) + VSC_TP_CRC_SIZE - offset + VSC_TP_PACKET_PADDING_SIZE)
+
+struct vsc_tp_packet {
+ __u8 sync;
+ __u8 cmd;
+ __le16 len;
+ __le32 seq;
+ __u8 buf[] __counted_by(len);
+};
+
+struct vsc_tp {
+ /* do the actual data transfer */
+ struct spi_device *spi;
+
+ /* bind with mei framework */
+ struct platform_device *pdev;
+
+ struct gpio_desc *wakeuphost;
+ struct gpio_desc *resetfw;
+ struct gpio_desc *wakeupfw;
+
+ /* command sequence number */
+ u32 seq;
+
+ /* command buffer */
+ void *tx_buf;
+ void *rx_buf;
+
+ atomic_t assert_cnt;
+ wait_queue_head_t xfer_wait;
+
+ vsc_tp_event_cb_t event_notify;
+ void *event_notify_context;
+
+ /* used to protect command download */
+ struct mutex mutex;
+};
+
+/* GPIO resources */
+static const struct acpi_gpio_params wakeuphost_gpio = { 0, 0, false };
+static const struct acpi_gpio_params wakeuphostint_gpio = { 1, 0, false };
+static const struct acpi_gpio_params resetfw_gpio = { 2, 0, false };
+static const struct acpi_gpio_params wakeupfw = { 3, 0, false };
+
+static const struct acpi_gpio_mapping vsc_tp_acpi_gpios[] = {
+ { "wakeuphost-gpios", &wakeuphost_gpio, 1 },
+ { "wakeuphostint-gpios", &wakeuphostint_gpio, 1 },
+ { "resetfw-gpios", &resetfw_gpio, 1 },
+ { "wakeupfw-gpios", &wakeupfw, 1 },
+ {}
+};
+
+/* wakeup firmware and wait for response */
+static int vsc_tp_wakeup_request(struct vsc_tp *tp)
+{
+ int ret;
+
+ gpiod_set_value_cansleep(tp->wakeupfw, 0);
+
+ ret = wait_event_timeout(tp->xfer_wait,
+ atomic_read(&tp->assert_cnt) &&
+ gpiod_get_value_cansleep(tp->wakeuphost),
+ VSC_TP_WAIT_FW_ASSERTED_TIMEOUT);
+ if (!ret)
+ return -ETIMEDOUT;
+
+ return 0;
+}
+
+static void vsc_tp_wakeup_release(struct vsc_tp *tp)
+{
+ atomic_dec_if_positive(&tp->assert_cnt);
+
+ gpiod_set_value_cansleep(tp->wakeupfw, 1);
+}
+
+static int vsc_tp_dev_xfer(struct vsc_tp *tp, void *obuf, void *ibuf, size_t len)
+{
+ struct spi_message msg = { 0 };
+ struct spi_transfer xfer = {
+ .tx_buf = obuf,
+ .rx_buf = ibuf,
+ .len = len,
+ };
+
+ spi_message_init_with_transfers(&msg, &xfer, 1);
+
+ return spi_sync_locked(tp->spi, &msg);
+}
+
+static int vsc_tp_xfer_helper(struct vsc_tp *tp, struct vsc_tp_packet *pkt,
+ void *ibuf, u16 ilen)
+{
+ int ret, offset = 0, cpy_len, src_len, dst_len = sizeof(struct vsc_tp_packet);
+ int next_xfer_len = VSC_TP_PACKET_SIZE(pkt) + VSC_TP_XFER_TIMEOUT_BYTES;
+ u8 *src, *crc_src, *rx_buf = tp->rx_buf;
+ int count_down = VSC_TP_MAX_XFER_COUNT;
+ u32 recv_crc = 0, crc = ~0;
+ struct vsc_tp_packet ack;
+ u8 *dst = (u8 *)&ack;
+ bool synced = false;
+
+ do {
+ ret = vsc_tp_dev_xfer(tp, pkt, rx_buf, next_xfer_len);
+ if (ret)
+ return ret;
+ memset(pkt, 0, VSC_TP_MAX_XFER_SIZE);
+
+ if (synced) {
+ src = rx_buf;
+ src_len = next_xfer_len;
+ } else {
+ src = memchr(rx_buf, VSC_TP_PACKET_SYNC, next_xfer_len);
+ if (!src)
+ continue;
+ synced = true;
+ src_len = next_xfer_len - (src - rx_buf);
+ }
+
+ /* traverse received data */
+ while (src_len > 0) {
+ cpy_len = min(src_len, dst_len);
+ memcpy(dst, src, cpy_len);
+ crc_src = src;
+ src += cpy_len;
+ src_len -= cpy_len;
+ dst += cpy_len;
+ dst_len -= cpy_len;
+
+ if (offset < sizeof(ack)) {
+ offset += cpy_len;
+ crc = crc32(crc, crc_src, cpy_len);
+
+ if (!src_len)
+ continue;
+
+ if (le16_to_cpu(ack.len)) {
+ dst = ibuf;
+ dst_len = min(ilen, le16_to_cpu(ack.len));
+ } else {
+ dst = (u8 *)&recv_crc;
+ dst_len = sizeof(recv_crc);
+ }
+ } else if (offset < sizeof(ack) + le16_to_cpu(ack.len)) {
+ offset += cpy_len;
+ crc = crc32(crc, crc_src, cpy_len);
+
+ if (src_len) {
+ int remain = sizeof(ack) + le16_to_cpu(ack.len) - offset;
+
+ cpy_len = min(src_len, remain);
+ offset += cpy_len;
+ crc = crc32(crc, src, cpy_len);
+ src += cpy_len;
+ src_len -= cpy_len;
+ if (src_len) {
+ dst = (u8 *)&recv_crc;
+ dst_len = sizeof(recv_crc);
+ continue;
+ }
+ }
+ next_xfer_len = VSC_TP_NEXT_XFER_LEN(le16_to_cpu(ack.len), offset);
+ } else if (offset < sizeof(ack) + le16_to_cpu(ack.len) + VSC_TP_CRC_SIZE) {
+ offset += cpy_len;
+
+ if (src_len) {
+ /* terminate the traverse */
+ next_xfer_len = 0;
+ break;
+ }
+ next_xfer_len = VSC_TP_NEXT_XFER_LEN(le16_to_cpu(ack.len), offset);
+ }
+ }
+ } while (next_xfer_len > 0 && --count_down);
+
+ if (next_xfer_len > 0)
+ return -EAGAIN;
+
+ if (~recv_crc != crc || le32_to_cpu(ack.seq) != tp->seq) {
+ dev_err(&tp->spi->dev, "recv crc or seq error\n");
+ return -EINVAL;
+ }
+
+ if (ack.cmd == VSC_TP_CMD_ACK || ack.cmd == VSC_TP_CMD_NACK ||
+ ack.cmd == VSC_TP_CMD_BUSY) {
+ dev_err(&tp->spi->dev, "recv cmd ack error\n");
+ return -EAGAIN;
+ }
+
+ return min(le16_to_cpu(ack.len), ilen);
+}
+
+/**
+ * vsc_tp_xfer - transfer data to firmware
+ * @tp: vsc_tp device handle
+ * @cmd: the command to be sent to the device
+ * @obuf: the tx buffer to be sent to the device
+ * @olen: the length of tx buffer
+ * @ibuf: the rx buffer to receive from the device
+ * @ilen: the length of rx buffer
+ * Return: the length of received data in case of success,
+ * otherwise negative value
+ */
+int vsc_tp_xfer(struct vsc_tp *tp, u8 cmd, const void *obuf, size_t olen,
+ void *ibuf, size_t ilen)
+{
+ struct vsc_tp_packet *pkt = tp->tx_buf;
+ u32 crc;
+ int ret;
+
+ if (!obuf || !ibuf || olen > VSC_TP_MAX_MSG_SIZE)
+ return -EINVAL;
+
+ guard(mutex)(&tp->mutex);
+
+ pkt->sync = VSC_TP_PACKET_SYNC;
+ pkt->cmd = cmd;
+ pkt->len = cpu_to_le16(olen);
+ pkt->seq = cpu_to_le32(++tp->seq);
+ memcpy(pkt->buf, obuf, olen);
+
+ crc = ~crc32(~0, (u8 *)pkt, sizeof(pkt) + olen);
+ memcpy(pkt->buf + olen, &crc, sizeof(crc));
+
+ ret = vsc_tp_wakeup_request(tp);
+ if (unlikely(ret))
+ dev_err(&tp->spi->dev, "wakeup firmware failed ret: %d\n", ret);
+ else
+ ret = vsc_tp_xfer_helper(tp, pkt, ibuf, ilen);
+
+ vsc_tp_wakeup_release(tp);
+
+ return ret;
+}
+EXPORT_SYMBOL_NS_GPL(vsc_tp_xfer, VSC_TP);
+
+/**
+ * vsc_tp_rom_xfer - transfer data to rom code
+ * @tp: vsc_tp device handle
+ * @obuf: the data buffer to be sent to the device
+ * @ibuf: the buffer to receive data from the device
+ * @len: the length of tx buffer and rx buffer
+ * Return: 0 in case of success, negative value in case of error
+ */
+int vsc_tp_rom_xfer(struct vsc_tp *tp, const void *obuf, void *ibuf, size_t len)
+{
+ size_t words = len / sizeof(__be32);
+ int ret;
+
+ if (len % sizeof(__be32) || len > VSC_TP_MAX_MSG_SIZE)
+ return -EINVAL;
+
+ guard(mutex)(&tp->mutex);
+
+ /* rom xfer is big endian */
+ cpu_to_be32_array(tp->tx_buf, obuf, words);
+
+ ret = read_poll_timeout(gpiod_get_value_cansleep, ret,
+ !ret, VSC_TP_ROM_XFER_POLL_DELAY_US,
+ VSC_TP_ROM_XFER_POLL_TIMEOUT_US, false,
+ tp->wakeuphost);
+ if (ret) {
+ dev_err(&tp->spi->dev, "wait rom failed ret: %d\n", ret);
+ return ret;
+ }
+
+ ret = vsc_tp_dev_xfer(tp, tp->tx_buf, tp->rx_buf, len);
+ if (ret)
+ return ret;
+
+ if (ibuf)
+ cpu_to_be32_array(ibuf, tp->rx_buf, words);
+
+ return ret;
+}
+
+/**
+ * vsc_tp_reset - reset vsc transport layer
+ * @tp: vsc_tp device handle
+ */
+void vsc_tp_reset(struct vsc_tp *tp)
+{
+ disable_irq(tp->spi->irq);
+
+ /* toggle reset pin */
+ gpiod_set_value_cansleep(tp->resetfw, 0);
+ msleep(VSC_TP_RESET_PIN_TOGGLE_INTERVAL_MS);
+ gpiod_set_value_cansleep(tp->resetfw, 1);
+
+ /* wait for ROM */
+ msleep(VSC_TP_ROM_BOOTUP_DELAY_MS);
+
+ /*
+ * Set default host wakeup pin to non-active
+ * to avoid unexpected host irq interrupt.
+ */
+ gpiod_set_value_cansleep(tp->wakeupfw, 1);
+
+ atomic_set(&tp->assert_cnt, 0);
+
+ enable_irq(tp->spi->irq);
+}
+EXPORT_SYMBOL_NS_GPL(vsc_tp_reset, VSC_TP);
+
+/**
+ * vsc_tp_need_read - check if device has data to sent
+ * @tp: vsc_tp device handle
+ * Return: true if device has data to sent, otherwise false
+ */
+bool vsc_tp_need_read(struct vsc_tp *tp)
+{
+ if (!atomic_read(&tp->assert_cnt))
+ return false;
+ if (!gpiod_get_value_cansleep(tp->wakeuphost))
+ return false;
+ if (!gpiod_get_value_cansleep(tp->wakeupfw))
+ return false;
+
+ return true;
+}
+EXPORT_SYMBOL_NS_GPL(vsc_tp_need_read, VSC_TP);
+
+/**
+ * vsc_tp_register_event_cb - register a callback function to receive event
+ * @tp: vsc_tp device handle
+ * @event_cb: callback function
+ * @context: execution context of event callback
+ * Return: 0 in case of success, negative value in case of error
+ */
+int vsc_tp_register_event_cb(struct vsc_tp *tp, vsc_tp_event_cb_t event_cb,
+ void *context)
+{
+ tp->event_notify = event_cb;
+ tp->event_notify_context = context;
+
+ return 0;
+}
+EXPORT_SYMBOL_NS_GPL(vsc_tp_register_event_cb, VSC_TP);
+
+/**
+ * vsc_tp_intr_synchronize - synchronize vsc_tp interrupt
+ * @tp: vsc_tp device handle
+ */
+void vsc_tp_intr_synchronize(struct vsc_tp *tp)
+{
+ synchronize_irq(tp->spi->irq);
+}
+EXPORT_SYMBOL_NS_GPL(vsc_tp_intr_synchronize, VSC_TP);
+
+/**
+ * vsc_tp_intr_enable - enable vsc_tp interrupt
+ * @tp: vsc_tp device handle
+ */
+void vsc_tp_intr_enable(struct vsc_tp *tp)
+{
+ enable_irq(tp->spi->irq);
+}
+EXPORT_SYMBOL_NS_GPL(vsc_tp_intr_enable, VSC_TP);
+
+/**
+ * vsc_tp_intr_disable - disable vsc_tp interrupt
+ * @tp: vsc_tp device handle
+ */
+void vsc_tp_intr_disable(struct vsc_tp *tp)
+{
+ disable_irq(tp->spi->irq);
+}
+EXPORT_SYMBOL_NS_GPL(vsc_tp_intr_disable, VSC_TP);
+
+static irqreturn_t vsc_tp_isr(int irq, void *data)
+{
+ struct vsc_tp *tp = data;
+
+ atomic_inc(&tp->assert_cnt);
+
+ wake_up(&tp->xfer_wait);
+
+ return IRQ_WAKE_THREAD;
+}
+
+static irqreturn_t vsc_tp_thread_isr(int irq, void *data)
+{
+ struct vsc_tp *tp = data;
+
+ if (tp->event_notify)
+ tp->event_notify(tp->event_notify_context);
+
+ return IRQ_HANDLED;
+}
+
+static int vsc_tp_match_any(struct acpi_device *adev, void *data)
+{
+ struct acpi_device **__adev = data;
+
+ *__adev = adev;
+
+ return 1;
+}
+
+static int vsc_tp_probe(struct spi_device *spi)
+{
+ struct platform_device_info pinfo = { 0 };
+ struct device *dev = &spi->dev;
+ struct platform_device *pdev;
+ struct acpi_device *adev;
+ struct vsc_tp *tp;
+ int ret;
+
+ tp = devm_kzalloc(dev, sizeof(*tp), GFP_KERNEL);
+ if (!tp)
+ return -ENOMEM;
+
+ tp->tx_buf = devm_kzalloc(dev, VSC_TP_MAX_XFER_SIZE, GFP_KERNEL);
+ if (!tp->tx_buf)
+ return -ENOMEM;
+
+ tp->rx_buf = devm_kzalloc(dev, VSC_TP_MAX_XFER_SIZE, GFP_KERNEL);
+ if (!tp->rx_buf)
+ return -ENOMEM;
+
+ ret = devm_acpi_dev_add_driver_gpios(dev, vsc_tp_acpi_gpios);
+ if (ret)
+ return ret;
+
+ tp->wakeuphost = devm_gpiod_get(dev, "wakeuphost", GPIOD_IN);
+ if (IS_ERR(tp->wakeuphost))
+ return PTR_ERR(tp->wakeuphost);
+
+ tp->resetfw = devm_gpiod_get(dev, "resetfw", GPIOD_OUT_HIGH);
+ if (IS_ERR(tp->resetfw))
+ return PTR_ERR(tp->resetfw);
+
+ tp->wakeupfw = devm_gpiod_get(dev, "wakeupfw", GPIOD_OUT_HIGH);
+ if (IS_ERR(tp->wakeupfw))
+ return PTR_ERR(tp->wakeupfw);
+
+ atomic_set(&tp->assert_cnt, 0);
+ init_waitqueue_head(&tp->xfer_wait);
+ tp->spi = spi;
+
+ irq_set_status_flags(spi->irq, IRQ_DISABLE_UNLAZY);
+ ret = devm_request_threaded_irq(dev, spi->irq, vsc_tp_isr,
+ vsc_tp_thread_isr,
+ IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+ dev_name(dev), tp);
+ if (ret)
+ return ret;
+
+ mutex_init(&tp->mutex);
+
+ /* only one child acpi device */
+ ret = acpi_dev_for_each_child(ACPI_COMPANION(dev),
+ vsc_tp_match_any, &adev);
+ if (!ret) {
+ ret = -ENODEV;
+ goto err_destroy_lock;
+ }
+ pinfo.fwnode = acpi_fwnode_handle(adev);
+
+ pinfo.name = "intel_vsc";
+ pinfo.data = &tp;
+ pinfo.size_data = sizeof(tp);
+ pinfo.id = PLATFORM_DEVID_NONE;
+
+ pdev = platform_device_register_full(&pinfo);
+ if (IS_ERR(pdev)) {
+ ret = PTR_ERR(pdev);
+ goto err_destroy_lock;
+ }
+
+ tp->pdev = pdev;
+ spi_set_drvdata(spi, tp);
+
+ return 0;
+
+err_destroy_lock:
+ mutex_destroy(&tp->mutex);
+
+ return ret;
+}
+
+static void vsc_tp_remove(struct spi_device *spi)
+{
+ struct vsc_tp *tp = spi_get_drvdata(spi);
+
+ platform_device_unregister(tp->pdev);
+
+ mutex_destroy(&tp->mutex);
+}
+
+static const struct acpi_device_id vsc_tp_acpi_ids[] = {
+ { "INTC1009" }, /* Raptor Lake */
+ { "INTC1058" }, /* Tiger Lake */
+ { "INTC1094" }, /* Alder Lake */
+ {}
+};
+MODULE_DEVICE_TABLE(acpi, vsc_tp_acpi_ids);
+
+static struct spi_driver vsc_tp_driver = {
+ .probe = vsc_tp_probe,
+ .remove = vsc_tp_remove,
+ .driver = {
+ .name = "vsc-tp",
+ .acpi_match_table = vsc_tp_acpi_ids,
+ },
+};
+module_spi_driver(vsc_tp_driver);
+
+MODULE_AUTHOR("Wentong Wu <wentong.wu@intel.com>");
+MODULE_AUTHOR("Zhifeng Wang <zhifeng.wang@intel.com>");
+MODULE_DESCRIPTION("Intel Visual Sensing Controller Transport Layer");
+MODULE_LICENSE("GPL");
diff --git a/drivers/misc/mei/vsc-tp.h b/drivers/misc/mei/vsc-tp.h
new file mode 100644
index 000000000000..f9513ddc3e40
--- /dev/null
+++ b/drivers/misc/mei/vsc-tp.h
@@ -0,0 +1,50 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2023, Intel Corporation.
+ * Intel Visual Sensing Controller Transport Layer Linux driver
+ */
+
+#ifndef _VSC_TP_H_
+#define _VSC_TP_H_
+
+#include <linux/types.h>
+
+#define VSC_TP_CMD_WRITE 0x01
+#define VSC_TP_CMD_READ 0x02
+
+#define VSC_TP_CMD_ACK 0x10
+#define VSC_TP_CMD_NACK 0x11
+#define VSC_TP_CMD_BUSY 0x12
+
+struct vsc_tp;
+
+/**
+ * typedef vsc_event_cb_t - event callback function signature
+ * @context: the execution context of who registered this callback
+ *
+ * The callback function is called in interrupt context and the data
+ * payload is only valid during the call. If the user needs access
+ * the data payload later, it must copy the payload.
+ */
+typedef void (*vsc_tp_event_cb_t)(void *context);
+
+int vsc_tp_rom_xfer(struct vsc_tp *tp, const void *obuf, void *ibuf,
+ size_t len);
+
+int vsc_tp_xfer(struct vsc_tp *tp, u8 cmd, const void *obuf, size_t olen,
+ void *ibuf, size_t ilen);
+
+int vsc_tp_register_event_cb(struct vsc_tp *tp, vsc_tp_event_cb_t event_cb,
+ void *context);
+
+void vsc_tp_intr_enable(struct vsc_tp *tp);
+void vsc_tp_intr_disable(struct vsc_tp *tp);
+void vsc_tp_intr_synchronize(struct vsc_tp *tp);
+
+void vsc_tp_reset(struct vsc_tp *tp);
+
+bool vsc_tp_need_read(struct vsc_tp *tp);
+
+int vsc_tp_init(struct vsc_tp *tp, struct device *dev);
+
+#endif
diff --git a/drivers/misc/nsm.c b/drivers/misc/nsm.c
new file mode 100644
index 000000000000..0eaa3b4484bd
--- /dev/null
+++ b/drivers/misc/nsm.c
@@ -0,0 +1,506 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Amazon Nitro Secure Module driver.
+ *
+ * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ *
+ * The Nitro Secure Module implements commands via CBOR over virtio.
+ * This driver exposes a raw message ioctls on /dev/nsm that user
+ * space can use to issue these commands.
+ */
+
+#include <linux/file.h>
+#include <linux/fs.h>
+#include <linux/interrupt.h>
+#include <linux/hw_random.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/uaccess.h>
+#include <linux/uio.h>
+#include <linux/virtio_config.h>
+#include <linux/virtio_ids.h>
+#include <linux/virtio.h>
+#include <linux/wait.h>
+#include <uapi/linux/nsm.h>
+
+/* Timeout for NSM virtqueue respose in milliseconds. */
+#define NSM_DEFAULT_TIMEOUT_MSECS (120000) /* 2 minutes */
+
+/* Maximum length input data */
+struct nsm_data_req {
+ u32 len;
+ u8 data[NSM_REQUEST_MAX_SIZE];
+};
+
+/* Maximum length output data */
+struct nsm_data_resp {
+ u32 len;
+ u8 data[NSM_RESPONSE_MAX_SIZE];
+};
+
+/* Full NSM request/response message */
+struct nsm_msg {
+ struct nsm_data_req req;
+ struct nsm_data_resp resp;
+};
+
+struct nsm {
+ struct virtio_device *vdev;
+ struct virtqueue *vq;
+ struct mutex lock;
+ struct completion cmd_done;
+ struct miscdevice misc;
+ struct hwrng hwrng;
+ struct work_struct misc_init;
+ struct nsm_msg msg;
+};
+
+/* NSM device ID */
+static const struct virtio_device_id id_table[] = {
+ { VIRTIO_ID_NITRO_SEC_MOD, VIRTIO_DEV_ANY_ID },
+ { 0 },
+};
+
+static struct nsm *file_to_nsm(struct file *file)
+{
+ return container_of(file->private_data, struct nsm, misc);
+}
+
+static struct nsm *hwrng_to_nsm(struct hwrng *rng)
+{
+ return container_of(rng, struct nsm, hwrng);
+}
+
+#define CBOR_TYPE_MASK 0xE0
+#define CBOR_TYPE_MAP 0xA0
+#define CBOR_TYPE_TEXT 0x60
+#define CBOR_TYPE_ARRAY 0x40
+#define CBOR_HEADER_SIZE_SHORT 1
+
+#define CBOR_SHORT_SIZE_MAX_VALUE 23
+#define CBOR_LONG_SIZE_U8 24
+#define CBOR_LONG_SIZE_U16 25
+#define CBOR_LONG_SIZE_U32 26
+#define CBOR_LONG_SIZE_U64 27
+
+static bool cbor_object_is_array(const u8 *cbor_object, size_t cbor_object_size)
+{
+ if (cbor_object_size == 0 || cbor_object == NULL)
+ return false;
+
+ return (cbor_object[0] & CBOR_TYPE_MASK) == CBOR_TYPE_ARRAY;
+}
+
+static int cbor_object_get_array(u8 *cbor_object, size_t cbor_object_size, u8 **cbor_array)
+{
+ u8 cbor_short_size;
+ void *array_len_p;
+ u64 array_len;
+ u64 array_offset;
+
+ if (!cbor_object_is_array(cbor_object, cbor_object_size))
+ return -EFAULT;
+
+ cbor_short_size = (cbor_object[0] & 0x1F);
+
+ /* Decoding byte array length */
+ array_offset = CBOR_HEADER_SIZE_SHORT;
+ if (cbor_short_size >= CBOR_LONG_SIZE_U8)
+ array_offset += BIT(cbor_short_size - CBOR_LONG_SIZE_U8);
+
+ if (cbor_object_size < array_offset)
+ return -EFAULT;
+
+ array_len_p = &cbor_object[1];
+
+ switch (cbor_short_size) {
+ case CBOR_SHORT_SIZE_MAX_VALUE: /* short encoding */
+ array_len = cbor_short_size;
+ break;
+ case CBOR_LONG_SIZE_U8:
+ array_len = *(u8 *)array_len_p;
+ break;
+ case CBOR_LONG_SIZE_U16:
+ array_len = be16_to_cpup((__be16 *)array_len_p);
+ break;
+ case CBOR_LONG_SIZE_U32:
+ array_len = be32_to_cpup((__be32 *)array_len_p);
+ break;
+ case CBOR_LONG_SIZE_U64:
+ array_len = be64_to_cpup((__be64 *)array_len_p);
+ break;
+ }
+
+ if (cbor_object_size < array_offset)
+ return -EFAULT;
+
+ if (cbor_object_size - array_offset < array_len)
+ return -EFAULT;
+
+ if (array_len > INT_MAX)
+ return -EFAULT;
+
+ *cbor_array = cbor_object + array_offset;
+ return array_len;
+}
+
+/* Copy the request of a raw message to kernel space */
+static int fill_req_raw(struct nsm *nsm, struct nsm_data_req *req,
+ struct nsm_raw *raw)
+{
+ /* Verify the user input size. */
+ if (raw->request.len > sizeof(req->data))
+ return -EMSGSIZE;
+
+ /* Copy the request payload */
+ if (copy_from_user(req->data, u64_to_user_ptr(raw->request.addr),
+ raw->request.len))
+ return -EFAULT;
+
+ req->len = raw->request.len;
+
+ return 0;
+}
+
+/* Copy the response of a raw message back to user-space */
+static int parse_resp_raw(struct nsm *nsm, struct nsm_data_resp *resp,
+ struct nsm_raw *raw)
+{
+ /* Truncate any message that does not fit. */
+ raw->response.len = min_t(u64, raw->response.len, resp->len);
+
+ /* Copy the response content to user space */
+ if (copy_to_user(u64_to_user_ptr(raw->response.addr),
+ resp->data, raw->response.len))
+ return -EFAULT;
+
+ return 0;
+}
+
+/* Virtqueue interrupt handler */
+static void nsm_vq_callback(struct virtqueue *vq)
+{
+ struct nsm *nsm = vq->vdev->priv;
+
+ complete(&nsm->cmd_done);
+}
+
+/* Forward a message to the NSM device and wait for the response from it */
+static int nsm_sendrecv_msg_locked(struct nsm *nsm)
+{
+ struct device *dev = &nsm->vdev->dev;
+ struct scatterlist sg_in, sg_out;
+ struct nsm_msg *msg = &nsm->msg;
+ struct virtqueue *vq = nsm->vq;
+ unsigned int len;
+ void *queue_buf;
+ bool kicked;
+ int rc;
+
+ /* Initialize scatter-gather lists with request and response buffers. */
+ sg_init_one(&sg_out, msg->req.data, msg->req.len);
+ sg_init_one(&sg_in, msg->resp.data, sizeof(msg->resp.data));
+
+ init_completion(&nsm->cmd_done);
+ /* Add the request buffer (read by the device). */
+ rc = virtqueue_add_outbuf(vq, &sg_out, 1, msg->req.data, GFP_KERNEL);
+ if (rc)
+ return rc;
+
+ /* Add the response buffer (written by the device). */
+ rc = virtqueue_add_inbuf(vq, &sg_in, 1, msg->resp.data, GFP_KERNEL);
+ if (rc)
+ goto cleanup;
+
+ kicked = virtqueue_kick(vq);
+ if (!kicked) {
+ /* Cannot kick the virtqueue. */
+ rc = -EIO;
+ goto cleanup;
+ }
+
+ /* If the kick succeeded, wait for the device's response. */
+ if (!wait_for_completion_io_timeout(&nsm->cmd_done,
+ msecs_to_jiffies(NSM_DEFAULT_TIMEOUT_MSECS))) {
+ rc = -ETIMEDOUT;
+ goto cleanup;
+ }
+
+ queue_buf = virtqueue_get_buf(vq, &len);
+ if (!queue_buf || (queue_buf != msg->req.data)) {
+ dev_err(dev, "wrong request buffer.");
+ rc = -ENODATA;
+ goto cleanup;
+ }
+
+ queue_buf = virtqueue_get_buf(vq, &len);
+ if (!queue_buf || (queue_buf != msg->resp.data)) {
+ dev_err(dev, "wrong response buffer.");
+ rc = -ENODATA;
+ goto cleanup;
+ }
+
+ msg->resp.len = len;
+
+ rc = 0;
+
+cleanup:
+ if (rc) {
+ /* Clean the virtqueue. */
+ while (virtqueue_get_buf(vq, &len) != NULL)
+ ;
+ }
+
+ return rc;
+}
+
+static int fill_req_get_random(struct nsm *nsm, struct nsm_data_req *req)
+{
+ /*
+ * 69 # text(9)
+ * 47657452616E646F6D # "GetRandom"
+ */
+ const u8 request[] = { CBOR_TYPE_TEXT + strlen("GetRandom"),
+ 'G', 'e', 't', 'R', 'a', 'n', 'd', 'o', 'm' };
+
+ memcpy(req->data, request, sizeof(request));
+ req->len = sizeof(request);
+
+ return 0;
+}
+
+static int parse_resp_get_random(struct nsm *nsm, struct nsm_data_resp *resp,
+ void *out, size_t max)
+{
+ /*
+ * A1 # map(1)
+ * 69 # text(9) - Name of field
+ * 47657452616E646F6D # "GetRandom"
+ * A1 # map(1) - The field itself
+ * 66 # text(6)
+ * 72616E646F6D # "random"
+ * # The rest of the response is random data
+ */
+ const u8 response[] = { CBOR_TYPE_MAP + 1,
+ CBOR_TYPE_TEXT + strlen("GetRandom"),
+ 'G', 'e', 't', 'R', 'a', 'n', 'd', 'o', 'm',
+ CBOR_TYPE_MAP + 1,
+ CBOR_TYPE_TEXT + strlen("random"),
+ 'r', 'a', 'n', 'd', 'o', 'm' };
+ struct device *dev = &nsm->vdev->dev;
+ u8 *rand_data = NULL;
+ u8 *resp_ptr = resp->data;
+ u64 resp_len = resp->len;
+ int rc;
+
+ if ((resp->len < sizeof(response) + 1) ||
+ (memcmp(resp_ptr, response, sizeof(response)) != 0)) {
+ dev_err(dev, "Invalid response for GetRandom");
+ return -EFAULT;
+ }
+
+ resp_ptr += sizeof(response);
+ resp_len -= sizeof(response);
+
+ rc = cbor_object_get_array(resp_ptr, resp_len, &rand_data);
+ if (rc < 0) {
+ dev_err(dev, "GetRandom: Invalid CBOR encoding\n");
+ return rc;
+ }
+
+ rc = min_t(size_t, rc, max);
+ memcpy(out, rand_data, rc);
+
+ return rc;
+}
+
+/*
+ * HwRNG implementation
+ */
+static int nsm_rng_read(struct hwrng *rng, void *data, size_t max, bool wait)
+{
+ struct nsm *nsm = hwrng_to_nsm(rng);
+ struct device *dev = &nsm->vdev->dev;
+ int rc = 0;
+
+ /* NSM always needs to wait for a response */
+ if (!wait)
+ return 0;
+
+ mutex_lock(&nsm->lock);
+
+ rc = fill_req_get_random(nsm, &nsm->msg.req);
+ if (rc != 0)
+ goto out;
+
+ rc = nsm_sendrecv_msg_locked(nsm);
+ if (rc != 0)
+ goto out;
+
+ rc = parse_resp_get_random(nsm, &nsm->msg.resp, data, max);
+ if (rc < 0)
+ goto out;
+
+ dev_dbg(dev, "RNG: returning rand bytes = %d", rc);
+out:
+ mutex_unlock(&nsm->lock);
+ return rc;
+}
+
+static long nsm_dev_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ void __user *argp = u64_to_user_ptr((u64)arg);
+ struct nsm *nsm = file_to_nsm(file);
+ struct nsm_raw raw;
+ int r = 0;
+
+ if (cmd != NSM_IOCTL_RAW)
+ return -EINVAL;
+
+ if (_IOC_SIZE(cmd) != sizeof(raw))
+ return -EINVAL;
+
+ /* Copy user argument struct to kernel argument struct */
+ r = -EFAULT;
+ if (copy_from_user(&raw, argp, _IOC_SIZE(cmd)))
+ goto out;
+
+ mutex_lock(&nsm->lock);
+
+ /* Convert kernel argument struct to device request */
+ r = fill_req_raw(nsm, &nsm->msg.req, &raw);
+ if (r)
+ goto out;
+
+ /* Send message to NSM and read reply */
+ r = nsm_sendrecv_msg_locked(nsm);
+ if (r)
+ goto out;
+
+ /* Parse device response into kernel argument struct */
+ r = parse_resp_raw(nsm, &nsm->msg.resp, &raw);
+ if (r)
+ goto out;
+
+ /* Copy kernel argument struct back to user argument struct */
+ r = -EFAULT;
+ if (copy_to_user(argp, &raw, sizeof(raw)))
+ goto out;
+
+ r = 0;
+
+out:
+ mutex_unlock(&nsm->lock);
+ return r;
+}
+
+static int nsm_device_init_vq(struct virtio_device *vdev)
+{
+ struct virtqueue *vq = virtio_find_single_vq(vdev,
+ nsm_vq_callback, "nsm.vq.0");
+ struct nsm *nsm = vdev->priv;
+
+ if (IS_ERR(vq))
+ return PTR_ERR(vq);
+
+ nsm->vq = vq;
+
+ return 0;
+}
+
+static const struct file_operations nsm_dev_fops = {
+ .unlocked_ioctl = nsm_dev_ioctl,
+ .compat_ioctl = compat_ptr_ioctl,
+};
+
+/* Handler for probing the NSM device */
+static int nsm_device_probe(struct virtio_device *vdev)
+{
+ struct device *dev = &vdev->dev;
+ struct nsm *nsm;
+ int rc;
+
+ nsm = devm_kzalloc(&vdev->dev, sizeof(*nsm), GFP_KERNEL);
+ if (!nsm)
+ return -ENOMEM;
+
+ vdev->priv = nsm;
+ nsm->vdev = vdev;
+
+ rc = nsm_device_init_vq(vdev);
+ if (rc) {
+ dev_err(dev, "queue failed to initialize: %d.\n", rc);
+ goto err_init_vq;
+ }
+
+ mutex_init(&nsm->lock);
+
+ /* Register as hwrng provider */
+ nsm->hwrng = (struct hwrng) {
+ .read = nsm_rng_read,
+ .name = "nsm-hwrng",
+ .quality = 1000,
+ };
+
+ rc = hwrng_register(&nsm->hwrng);
+ if (rc) {
+ dev_err(dev, "RNG initialization error: %d.\n", rc);
+ goto err_hwrng;
+ }
+
+ /* Register /dev/nsm device node */
+ nsm->misc = (struct miscdevice) {
+ .minor = MISC_DYNAMIC_MINOR,
+ .name = "nsm",
+ .fops = &nsm_dev_fops,
+ .mode = 0666,
+ };
+
+ rc = misc_register(&nsm->misc);
+ if (rc) {
+ dev_err(dev, "misc device registration error: %d.\n", rc);
+ goto err_misc;
+ }
+
+ return 0;
+
+err_misc:
+ hwrng_unregister(&nsm->hwrng);
+err_hwrng:
+ vdev->config->del_vqs(vdev);
+err_init_vq:
+ return rc;
+}
+
+/* Handler for removing the NSM device */
+static void nsm_device_remove(struct virtio_device *vdev)
+{
+ struct nsm *nsm = vdev->priv;
+
+ hwrng_unregister(&nsm->hwrng);
+
+ vdev->config->del_vqs(vdev);
+ misc_deregister(&nsm->misc);
+}
+
+/* NSM device configuration structure */
+static struct virtio_driver virtio_nsm_driver = {
+ .feature_table = 0,
+ .feature_table_size = 0,
+ .feature_table_legacy = 0,
+ .feature_table_size_legacy = 0,
+ .driver.name = KBUILD_MODNAME,
+ .driver.owner = THIS_MODULE,
+ .id_table = id_table,
+ .probe = nsm_device_probe,
+ .remove = nsm_device_remove,
+};
+
+module_virtio_driver(virtio_nsm_driver);
+MODULE_DEVICE_TABLE(virtio, id_table);
+MODULE_DESCRIPTION("Virtio NSM driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/misc/ocxl/afu_irq.c b/drivers/misc/ocxl/afu_irq.c
index a06920b7e049..36f7379b8e2d 100644
--- a/drivers/misc/ocxl/afu_irq.c
+++ b/drivers/misc/ocxl/afu_irq.c
@@ -57,7 +57,7 @@ EXPORT_SYMBOL_GPL(ocxl_irq_set_handler);
static irqreturn_t afu_irq_handler(int virq, void *data)
{
- struct afu_irq *irq = (struct afu_irq *) data;
+ struct afu_irq *irq = data;
trace_ocxl_afu_irq_receive(virq);
diff --git a/drivers/misc/ocxl/context.c b/drivers/misc/ocxl/context.c
index 7f83116ae11a..cded7d1caf32 100644
--- a/drivers/misc/ocxl/context.c
+++ b/drivers/misc/ocxl/context.c
@@ -55,7 +55,7 @@ EXPORT_SYMBOL_GPL(ocxl_context_alloc);
*/
static void xsl_fault_error(void *data, u64 addr, u64 dsisr)
{
- struct ocxl_context *ctx = (struct ocxl_context *) data;
+ struct ocxl_context *ctx = data;
mutex_lock(&ctx->xsl_error_lock);
ctx->xsl_error.addr = addr;
diff --git a/drivers/misc/ocxl/link.c b/drivers/misc/ocxl/link.c
index c06c699c0e7b..03402203cacd 100644
--- a/drivers/misc/ocxl/link.c
+++ b/drivers/misc/ocxl/link.c
@@ -188,7 +188,7 @@ ack:
static irqreturn_t xsl_fault_handler(int irq, void *data)
{
- struct ocxl_link *link = (struct ocxl_link *) data;
+ struct ocxl_link *link = data;
struct spa *spa = link->spa;
u64 dsisr, dar, pe_handle;
struct pe_data *pe_data;
@@ -483,7 +483,7 @@ static void release_xsl(struct kref *ref)
void ocxl_link_release(struct pci_dev *dev, void *link_handle)
{
- struct ocxl_link *link = (struct ocxl_link *) link_handle;
+ struct ocxl_link *link = link_handle;
mutex_lock(&links_list_lock);
kref_put(&link->ref, release_xsl);
@@ -540,7 +540,7 @@ int ocxl_link_add_pe(void *link_handle, int pasid, u32 pidr, u32 tidr,
void (*xsl_err_cb)(void *data, u64 addr, u64 dsisr),
void *xsl_err_data)
{
- struct ocxl_link *link = (struct ocxl_link *) link_handle;
+ struct ocxl_link *link = link_handle;
struct spa *spa = link->spa;
struct ocxl_process_element *pe;
int pe_handle, rc = 0;
@@ -630,7 +630,7 @@ EXPORT_SYMBOL_GPL(ocxl_link_add_pe);
int ocxl_link_update_pe(void *link_handle, int pasid, __u16 tid)
{
- struct ocxl_link *link = (struct ocxl_link *) link_handle;
+ struct ocxl_link *link = link_handle;
struct spa *spa = link->spa;
struct ocxl_process_element *pe;
int pe_handle, rc;
@@ -666,7 +666,7 @@ int ocxl_link_update_pe(void *link_handle, int pasid, __u16 tid)
int ocxl_link_remove_pe(void *link_handle, int pasid)
{
- struct ocxl_link *link = (struct ocxl_link *) link_handle;
+ struct ocxl_link *link = link_handle;
struct spa *spa = link->spa;
struct ocxl_process_element *pe;
struct pe_data *pe_data;
@@ -752,7 +752,7 @@ EXPORT_SYMBOL_GPL(ocxl_link_remove_pe);
int ocxl_link_irq_alloc(void *link_handle, int *hw_irq)
{
- struct ocxl_link *link = (struct ocxl_link *) link_handle;
+ struct ocxl_link *link = link_handle;
int irq;
if (atomic_dec_if_positive(&link->irq_available) < 0)
@@ -771,7 +771,7 @@ EXPORT_SYMBOL_GPL(ocxl_link_irq_alloc);
void ocxl_link_free_irq(void *link_handle, int hw_irq)
{
- struct ocxl_link *link = (struct ocxl_link *) link_handle;
+ struct ocxl_link *link = link_handle;
xive_native_free_irq(hw_irq);
atomic_inc(&link->irq_available);
diff --git a/drivers/misc/ocxl/main.c b/drivers/misc/ocxl/main.c
index ef73cf35dda2..658974143c3c 100644
--- a/drivers/misc/ocxl/main.c
+++ b/drivers/misc/ocxl/main.c
@@ -7,7 +7,7 @@
static int __init init_ocxl(void)
{
- int rc = 0;
+ int rc;
if (!tlbie_capable)
return -EINVAL;
generated by cgit (git 2.34.1) at 2025-06-05 00:09:56 +0000