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-rw-r--r--drivers/platform/cznic/Kconfig50
-rw-r--r--drivers/platform/cznic/Makefile8
-rw-r--r--drivers/platform/cznic/turris-omnia-mcu-base.c408
-rw-r--r--drivers/platform/cznic/turris-omnia-mcu-gpio.c1095
-rw-r--r--drivers/platform/cznic/turris-omnia-mcu-sys-off-wakeup.c260
-rw-r--r--drivers/platform/cznic/turris-omnia-mcu-trng.c103
-rw-r--r--drivers/platform/cznic/turris-omnia-mcu-watchdog.c130
-rw-r--r--drivers/platform/cznic/turris-omnia-mcu.h194
8 files changed, 2248 insertions, 0 deletions
diff --git a/drivers/platform/cznic/Kconfig b/drivers/platform/cznic/Kconfig
new file mode 100644
index 000000000000..cb0d4d686d8a
--- /dev/null
+++ b/drivers/platform/cznic/Kconfig
@@ -0,0 +1,50 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# For a description of the syntax of this configuration file,
+# see Documentation/kbuild/kconfig-language.rst.
+#
+
+menuconfig CZNIC_PLATFORMS
+ bool "Platform support for CZ.NIC's Turris hardware"
+ help
+ Say Y here to be able to choose driver support for CZ.NIC's Turris
+ devices. This option alone does not add any kernel code.
+
+if CZNIC_PLATFORMS
+
+config TURRIS_OMNIA_MCU
+ tristate "Turris Omnia MCU driver"
+ depends on MACH_ARMADA_38X || COMPILE_TEST
+ depends on I2C
+ depends on OF
+ depends on WATCHDOG
+ depends on GPIOLIB
+ depends on HW_RANDOM
+ depends on RTC_CLASS
+ depends on WATCHDOG_CORE
+ select GPIOLIB_IRQCHIP
+ help
+ Say Y here to add support for the features implemented by the
+ microcontroller on the CZ.NIC's Turris Omnia SOHO router.
+ The features include:
+ - board poweroff into true low power mode (with voltage regulators
+ disabled) and the ability to configure wake up from this mode (via
+ rtcwake)
+ - true random number generator (if available on the MCU)
+ - MCU watchdog
+ - GPIO pins
+ - to get front button press events (the front button can be
+ configured either to generate press events to the CPU or to change
+ front LEDs panel brightness)
+ - to enable / disable USB port voltage regulators and to detect
+ USB overcurrent
+ - to detect MiniPCIe / mSATA card presence in MiniPCIe port 0
+ - to configure resets of various peripherals on board revisions 32+
+ - to enable / disable the VHV voltage regulator to the SOC in order
+ to be able to program SOC's OTP on board revisions 32+
+ - to get input from the LED output pins of the WAN ethernet PHY, LAN
+ switch and MiniPCIe ports
+ To compile this driver as a module, choose M here; the module will be
+ called turris-omnia-mcu.
+
+endif # CZNIC_PLATFORMS
diff --git a/drivers/platform/cznic/Makefile b/drivers/platform/cznic/Makefile
new file mode 100644
index 000000000000..eae4c6b341ff
--- /dev/null
+++ b/drivers/platform/cznic/Makefile
@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+obj-$(CONFIG_TURRIS_OMNIA_MCU) += turris-omnia-mcu.o
+turris-omnia-mcu-y := turris-omnia-mcu-base.o
+turris-omnia-mcu-y += turris-omnia-mcu-gpio.o
+turris-omnia-mcu-y += turris-omnia-mcu-sys-off-wakeup.o
+turris-omnia-mcu-y += turris-omnia-mcu-trng.o
+turris-omnia-mcu-y += turris-omnia-mcu-watchdog.o
diff --git a/drivers/platform/cznic/turris-omnia-mcu-base.c b/drivers/platform/cznic/turris-omnia-mcu-base.c
new file mode 100644
index 000000000000..c68a7a84a951
--- /dev/null
+++ b/drivers/platform/cznic/turris-omnia-mcu-base.c
@@ -0,0 +1,408 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * CZ.NIC's Turris Omnia MCU driver
+ *
+ * 2024 by Marek Behún <kabel@kernel.org>
+ */
+
+#include <linux/array_size.h>
+#include <linux/bits.h>
+#include <linux/device.h>
+#include <linux/errno.h>
+#include <linux/hex.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/sysfs.h>
+#include <linux/types.h>
+
+#include <linux/turris-omnia-mcu-interface.h>
+#include "turris-omnia-mcu.h"
+
+#define OMNIA_FW_VERSION_LEN 20
+#define OMNIA_FW_VERSION_HEX_LEN (2 * OMNIA_FW_VERSION_LEN + 1)
+#define OMNIA_BOARD_INFO_LEN 16
+
+int omnia_cmd_write_read(const struct i2c_client *client,
+ void *cmd, unsigned int cmd_len,
+ void *reply, unsigned int reply_len)
+{
+ struct i2c_msg msgs[2];
+ int ret, num;
+
+ msgs[0].addr = client->addr;
+ msgs[0].flags = 0;
+ msgs[0].len = cmd_len;
+ msgs[0].buf = cmd;
+ num = 1;
+
+ if (reply_len) {
+ msgs[1].addr = client->addr;
+ msgs[1].flags = I2C_M_RD;
+ msgs[1].len = reply_len;
+ msgs[1].buf = reply;
+ num++;
+ }
+
+ ret = i2c_transfer(client->adapter, msgs, num);
+ if (ret < 0)
+ return ret;
+ if (ret != num)
+ return -EIO;
+
+ return 0;
+}
+
+static int omnia_get_version_hash(struct omnia_mcu *mcu, bool bootloader,
+ char version[static OMNIA_FW_VERSION_HEX_LEN])
+{
+ u8 reply[OMNIA_FW_VERSION_LEN];
+ char *p;
+ int err;
+
+ err = omnia_cmd_read(mcu->client,
+ bootloader ? OMNIA_CMD_GET_FW_VERSION_BOOT
+ : OMNIA_CMD_GET_FW_VERSION_APP,
+ reply, sizeof(reply));
+ if (err)
+ return err;
+
+ p = bin2hex(version, reply, OMNIA_FW_VERSION_LEN);
+ *p = '\0';
+
+ return 0;
+}
+
+static ssize_t fw_version_hash_show(struct device *dev, char *buf,
+ bool bootloader)
+{
+ struct omnia_mcu *mcu = dev_get_drvdata(dev);
+ char version[OMNIA_FW_VERSION_HEX_LEN];
+ int err;
+
+ err = omnia_get_version_hash(mcu, bootloader, version);
+ if (err)
+ return err;
+
+ return sysfs_emit(buf, "%s\n", version);
+}
+
+static ssize_t fw_version_hash_application_show(struct device *dev,
+ struct device_attribute *a,
+ char *buf)
+{
+ return fw_version_hash_show(dev, buf, false);
+}
+static DEVICE_ATTR_RO(fw_version_hash_application);
+
+static ssize_t fw_version_hash_bootloader_show(struct device *dev,
+ struct device_attribute *a,
+ char *buf)
+{
+ return fw_version_hash_show(dev, buf, true);
+}
+static DEVICE_ATTR_RO(fw_version_hash_bootloader);
+
+static ssize_t fw_features_show(struct device *dev, struct device_attribute *a,
+ char *buf)
+{
+ struct omnia_mcu *mcu = dev_get_drvdata(dev);
+
+ return sysfs_emit(buf, "0x%x\n", mcu->features);
+}
+static DEVICE_ATTR_RO(fw_features);
+
+static ssize_t mcu_type_show(struct device *dev, struct device_attribute *a,
+ char *buf)
+{
+ struct omnia_mcu *mcu = dev_get_drvdata(dev);
+
+ return sysfs_emit(buf, "%s\n", mcu->type);
+}
+static DEVICE_ATTR_RO(mcu_type);
+
+static ssize_t reset_selector_show(struct device *dev,
+ struct device_attribute *a, char *buf)
+{
+ u8 reply;
+ int err;
+
+ err = omnia_cmd_read_u8(to_i2c_client(dev), OMNIA_CMD_GET_RESET,
+ &reply);
+ if (err)
+ return err;
+
+ return sysfs_emit(buf, "%d\n", reply);
+}
+static DEVICE_ATTR_RO(reset_selector);
+
+static ssize_t serial_number_show(struct device *dev,
+ struct device_attribute *a, char *buf)
+{
+ struct omnia_mcu *mcu = dev_get_drvdata(dev);
+
+ return sysfs_emit(buf, "%016llX\n", mcu->board_serial_number);
+}
+static DEVICE_ATTR_RO(serial_number);
+
+static ssize_t first_mac_address_show(struct device *dev,
+ struct device_attribute *a, char *buf)
+{
+ struct omnia_mcu *mcu = dev_get_drvdata(dev);
+
+ return sysfs_emit(buf, "%pM\n", mcu->board_first_mac);
+}
+static DEVICE_ATTR_RO(first_mac_address);
+
+static ssize_t board_revision_show(struct device *dev,
+ struct device_attribute *a, char *buf)
+{
+ struct omnia_mcu *mcu = dev_get_drvdata(dev);
+
+ return sysfs_emit(buf, "%u\n", mcu->board_revision);
+}
+static DEVICE_ATTR_RO(board_revision);
+
+static struct attribute *omnia_mcu_base_attrs[] = {
+ &dev_attr_fw_version_hash_application.attr,
+ &dev_attr_fw_version_hash_bootloader.attr,
+ &dev_attr_fw_features.attr,
+ &dev_attr_mcu_type.attr,
+ &dev_attr_reset_selector.attr,
+ &dev_attr_serial_number.attr,
+ &dev_attr_first_mac_address.attr,
+ &dev_attr_board_revision.attr,
+ NULL
+};
+
+static umode_t omnia_mcu_base_attrs_visible(struct kobject *kobj,
+ struct attribute *a, int n)
+{
+ struct device *dev = kobj_to_dev(kobj);
+ struct omnia_mcu *mcu = dev_get_drvdata(dev);
+
+ if ((a == &dev_attr_serial_number.attr ||
+ a == &dev_attr_first_mac_address.attr ||
+ a == &dev_attr_board_revision.attr) &&
+ !(mcu->features & OMNIA_FEAT_BOARD_INFO))
+ return 0;
+
+ return a->mode;
+}
+
+static const struct attribute_group omnia_mcu_base_group = {
+ .attrs = omnia_mcu_base_attrs,
+ .is_visible = omnia_mcu_base_attrs_visible,
+};
+
+static const struct attribute_group *omnia_mcu_groups[] = {
+ &omnia_mcu_base_group,
+ &omnia_mcu_gpio_group,
+ &omnia_mcu_poweroff_group,
+ NULL
+};
+
+static void omnia_mcu_print_version_hash(struct omnia_mcu *mcu, bool bootloader)
+{
+ const char *type = bootloader ? "bootloader" : "application";
+ struct device *dev = &mcu->client->dev;
+ char version[OMNIA_FW_VERSION_HEX_LEN];
+ int err;
+
+ err = omnia_get_version_hash(mcu, bootloader, version);
+ if (err) {
+ dev_err(dev, "Cannot read MCU %s firmware version: %d\n",
+ type, err);
+ return;
+ }
+
+ dev_info(dev, "MCU %s firmware version hash: %s\n", type, version);
+}
+
+static const char *omnia_status_to_mcu_type(u16 status)
+{
+ switch (status & OMNIA_STS_MCU_TYPE_MASK) {
+ case OMNIA_STS_MCU_TYPE_STM32:
+ return "STM32";
+ case OMNIA_STS_MCU_TYPE_GD32:
+ return "GD32";
+ case OMNIA_STS_MCU_TYPE_MKL:
+ return "MKL";
+ default:
+ return "unknown";
+ }
+}
+
+static void omnia_info_missing_feature(struct device *dev, const char *feature)
+{
+ dev_info(dev,
+ "Your board's MCU firmware does not support the %s feature.\n",
+ feature);
+}
+
+static int omnia_mcu_read_features(struct omnia_mcu *mcu)
+{
+ static const struct {
+ u16 mask;
+ const char *name;
+ } features[] = {
+#define _DEF_FEAT(_n, _m) { OMNIA_FEAT_ ## _n, _m }
+ _DEF_FEAT(EXT_CMDS, "extended control and status"),
+ _DEF_FEAT(WDT_PING, "watchdog pinging"),
+ _DEF_FEAT(LED_STATE_EXT_MASK, "peripheral LED pins reading"),
+ _DEF_FEAT(NEW_INT_API, "new interrupt API"),
+ _DEF_FEAT(POWEROFF_WAKEUP, "poweroff and wakeup"),
+ _DEF_FEAT(TRNG, "true random number generator"),
+#undef _DEF_FEAT
+ };
+ struct i2c_client *client = mcu->client;
+ struct device *dev = &client->dev;
+ bool suggest_fw_upgrade = false;
+ u16 status;
+ int err;
+
+ /* status word holds MCU type, which we need below */
+ err = omnia_cmd_read_u16(client, OMNIA_CMD_GET_STATUS_WORD, &status);
+ if (err)
+ return err;
+
+ /*
+ * Check whether MCU firmware supports the OMNIA_CMD_GET_FEATURES
+ * command.
+ */
+ if (status & OMNIA_STS_FEATURES_SUPPORTED) {
+ /* try read 32-bit features */
+ err = omnia_cmd_read_u32(client, OMNIA_CMD_GET_FEATURES,
+ &mcu->features);
+ if (err) {
+ /* try read 16-bit features */
+ u16 features16;
+
+ err = omnia_cmd_read_u16(client, OMNIA_CMD_GET_FEATURES,
+ &features16);
+ if (err)
+ return err;
+
+ mcu->features = features16;
+ } else {
+ if (mcu->features & OMNIA_FEAT_FROM_BIT_16_INVALID)
+ mcu->features &= GENMASK(15, 0);
+ }
+ } else {
+ dev_info(dev,
+ "Your board's MCU firmware does not support feature reading.\n");
+ suggest_fw_upgrade = true;
+ }
+
+ mcu->type = omnia_status_to_mcu_type(status);
+ dev_info(dev, "MCU type %s%s\n", mcu->type,
+ (mcu->features & OMNIA_FEAT_PERIPH_MCU) ?
+ ", with peripheral resets wired" : "");
+
+ omnia_mcu_print_version_hash(mcu, true);
+
+ if (mcu->features & OMNIA_FEAT_BOOTLOADER)
+ dev_warn(dev,
+ "MCU is running bootloader firmware. Was firmware upgrade interrupted?\n");
+ else
+ omnia_mcu_print_version_hash(mcu, false);
+
+ for (unsigned int i = 0; i < ARRAY_SIZE(features); i++) {
+ if (mcu->features & features[i].mask)
+ continue;
+
+ omnia_info_missing_feature(dev, features[i].name);
+ suggest_fw_upgrade = true;
+ }
+
+ if (suggest_fw_upgrade)
+ dev_info(dev,
+ "Consider upgrading MCU firmware with the omnia-mcutool utility.\n");
+
+ return 0;
+}
+
+static int omnia_mcu_read_board_info(struct omnia_mcu *mcu)
+{
+ u8 reply[1 + OMNIA_BOARD_INFO_LEN];
+ int err;
+
+ err = omnia_cmd_read(mcu->client, OMNIA_CMD_BOARD_INFO_GET, reply,
+ sizeof(reply));
+ if (err)
+ return err;
+
+ if (reply[0] != OMNIA_BOARD_INFO_LEN)
+ return -EIO;
+
+ mcu->board_serial_number = get_unaligned_le64(&reply[1]);
+
+ /* we can't use ether_addr_copy() because reply is not u16-aligned */
+ memcpy(mcu->board_first_mac, &reply[9], sizeof(mcu->board_first_mac));
+
+ mcu->board_revision = reply[15];
+
+ return 0;
+}
+
+static int omnia_mcu_probe(struct i2c_client *client)
+{
+ struct device *dev = &client->dev;
+ struct omnia_mcu *mcu;
+ int err;
+
+ if (!client->irq)
+ return dev_err_probe(dev, -EINVAL, "IRQ resource not found\n");
+
+ mcu = devm_kzalloc(dev, sizeof(*mcu), GFP_KERNEL);
+ if (!mcu)
+ return -ENOMEM;
+
+ mcu->client = client;
+ i2c_set_clientdata(client, mcu);
+
+ err = omnia_mcu_read_features(mcu);
+ if (err)
+ return dev_err_probe(dev, err,
+ "Cannot determine MCU supported features\n");
+
+ if (mcu->features & OMNIA_FEAT_BOARD_INFO) {
+ err = omnia_mcu_read_board_info(mcu);
+ if (err)
+ return dev_err_probe(dev, err,
+ "Cannot read board info\n");
+ }
+
+ err = omnia_mcu_register_sys_off_and_wakeup(mcu);
+ if (err)
+ return err;
+
+ err = omnia_mcu_register_watchdog(mcu);
+ if (err)
+ return err;
+
+ err = omnia_mcu_register_gpiochip(mcu);
+ if (err)
+ return err;
+
+ return omnia_mcu_register_trng(mcu);
+}
+
+static const struct of_device_id of_omnia_mcu_match[] = {
+ { .compatible = "cznic,turris-omnia-mcu" },
+ {}
+};
+
+static struct i2c_driver omnia_mcu_driver = {
+ .probe = omnia_mcu_probe,
+ .driver = {
+ .name = "turris-omnia-mcu",
+ .of_match_table = of_omnia_mcu_match,
+ .dev_groups = omnia_mcu_groups,
+ },
+};
+module_i2c_driver(omnia_mcu_driver);
+
+MODULE_AUTHOR("Marek Behun <kabel@kernel.org>");
+MODULE_DESCRIPTION("CZ.NIC's Turris Omnia MCU");
+MODULE_LICENSE("GPL");
diff --git a/drivers/platform/cznic/turris-omnia-mcu-gpio.c b/drivers/platform/cznic/turris-omnia-mcu-gpio.c
new file mode 100644
index 000000000000..91da56a704c7
--- /dev/null
+++ b/drivers/platform/cznic/turris-omnia-mcu-gpio.c
@@ -0,0 +1,1095 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * CZ.NIC's Turris Omnia MCU GPIO and IRQ driver
+ *
+ * 2024 by Marek Behún <kabel@kernel.org>
+ */
+
+#include <linux/array_size.h>
+#include <linux/bitfield.h>
+#include <linux/bitops.h>
+#include <linux/bug.h>
+#include <linux/cleanup.h>
+#include <linux/device.h>
+#include <linux/devm-helpers.h>
+#include <linux/errno.h>
+#include <linux/gpio/driver.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/mutex.h>
+#include <linux/sysfs.h>
+#include <linux/types.h>
+#include <linux/workqueue.h>
+#include <asm/unaligned.h>
+
+#include <linux/turris-omnia-mcu-interface.h>
+#include "turris-omnia-mcu.h"
+
+#define OMNIA_CMD_INT_ARG_LEN 8
+#define FRONT_BUTTON_RELEASE_DELAY_MS 50
+
+static const char * const omnia_mcu_gpio_templates[64] = {
+ /* GPIOs with value read from the 16-bit wide status */
+ [4] = "MiniPCIe0 Card Detect",
+ [5] = "MiniPCIe0 mSATA Indicator",
+ [6] = "Front USB3 port over-current",
+ [7] = "Rear USB3 port over-current",
+ [8] = "Front USB3 port power",
+ [9] = "Rear USB3 port power",
+ [12] = "Front Button",
+
+ /* GPIOs with value read from the 32-bit wide extended status */
+ [16] = "SFP nDET",
+ [28] = "MiniPCIe0 LED",
+ [29] = "MiniPCIe1 LED",
+ [30] = "MiniPCIe2 LED",
+ [31] = "MiniPCIe0 PAN LED",
+ [32] = "MiniPCIe1 PAN LED",
+ [33] = "MiniPCIe2 PAN LED",
+ [34] = "WAN PHY LED0",
+ [35] = "WAN PHY LED1",
+ [36] = "LAN switch p0 LED0",
+ [37] = "LAN switch p0 LED1",
+ [38] = "LAN switch p1 LED0",
+ [39] = "LAN switch p1 LED1",
+ [40] = "LAN switch p2 LED0",
+ [41] = "LAN switch p2 LED1",
+ [42] = "LAN switch p3 LED0",
+ [43] = "LAN switch p3 LED1",
+ [44] = "LAN switch p4 LED0",
+ [45] = "LAN switch p4 LED1",
+ [46] = "LAN switch p5 LED0",
+ [47] = "LAN switch p5 LED1",
+
+ /* GPIOs with value read from the 16-bit wide extended control status */
+ [48] = "eMMC nRESET",
+ [49] = "LAN switch nRESET",
+ [50] = "WAN PHY nRESET",
+ [51] = "MiniPCIe0 nPERST",
+ [52] = "MiniPCIe1 nPERST",
+ [53] = "MiniPCIe2 nPERST",
+ [54] = "WAN PHY SFP mux",
+ [56] = "VHV power disable",
+};
+
+struct omnia_gpio {
+ u8 cmd;
+ u8 ctl_cmd;
+ u8 bit;
+ u8 ctl_bit;
+ u8 int_bit;
+ u16 feat;
+ u16 feat_mask;
+};
+
+#define OMNIA_GPIO_INVALID_INT_BIT 0xff
+
+#define _DEF_GPIO(_cmd, _ctl_cmd, _bit, _ctl_bit, _int_bit, _feat, _feat_mask) \
+ { \
+ .cmd = _cmd, \
+ .ctl_cmd = _ctl_cmd, \
+ .bit = _bit, \
+ .ctl_bit = _ctl_bit, \
+ .int_bit = (_int_bit) < 0 ? OMNIA_GPIO_INVALID_INT_BIT \
+ : (_int_bit), \
+ .feat = _feat, \
+ .feat_mask = _feat_mask, \
+ }
+
+#define _DEF_GPIO_STS(_name) \
+ _DEF_GPIO(OMNIA_CMD_GET_STATUS_WORD, 0, __bf_shf(OMNIA_STS_ ## _name), \
+ 0, __bf_shf(OMNIA_INT_ ## _name), 0, 0)
+
+#define _DEF_GPIO_CTL(_name) \
+ _DEF_GPIO(OMNIA_CMD_GET_STATUS_WORD, OMNIA_CMD_GENERAL_CONTROL, \
+ __bf_shf(OMNIA_STS_ ## _name), __bf_shf(OMNIA_CTL_ ## _name), \
+ -1, 0, 0)
+
+#define _DEF_GPIO_EXT_STS(_name, _feat) \
+ _DEF_GPIO(OMNIA_CMD_GET_EXT_STATUS_DWORD, 0, \
+ __bf_shf(OMNIA_EXT_STS_ ## _name), 0, \
+ __bf_shf(OMNIA_INT_ ## _name), \
+ OMNIA_FEAT_ ## _feat | OMNIA_FEAT_EXT_CMDS, \
+ OMNIA_FEAT_ ## _feat | OMNIA_FEAT_EXT_CMDS)
+
+#define _DEF_GPIO_EXT_STS_LED(_name, _ledext) \
+ _DEF_GPIO(OMNIA_CMD_GET_EXT_STATUS_DWORD, 0, \
+ __bf_shf(OMNIA_EXT_STS_ ## _name), 0, \
+ __bf_shf(OMNIA_INT_ ## _name), \
+ OMNIA_FEAT_LED_STATE_ ## _ledext, \
+ OMNIA_FEAT_LED_STATE_EXT_MASK)
+
+#define _DEF_GPIO_EXT_STS_LEDALL(_name) \
+ _DEF_GPIO(OMNIA_CMD_GET_EXT_STATUS_DWORD, 0, \
+ __bf_shf(OMNIA_EXT_STS_ ## _name), 0, \
+ __bf_shf(OMNIA_INT_ ## _name), \
+ OMNIA_FEAT_LED_STATE_EXT_MASK, 0)
+
+#define _DEF_GPIO_EXT_CTL(_name, _feat) \
+ _DEF_GPIO(OMNIA_CMD_GET_EXT_CONTROL_STATUS, OMNIA_CMD_EXT_CONTROL, \
+ __bf_shf(OMNIA_EXT_CTL_ ## _name), \
+ __bf_shf(OMNIA_EXT_CTL_ ## _name), -1, \
+ OMNIA_FEAT_ ## _feat | OMNIA_FEAT_EXT_CMDS, \
+ OMNIA_FEAT_ ## _feat | OMNIA_FEAT_EXT_CMDS)
+
+#define _DEF_INT(_name) \
+ _DEF_GPIO(0, 0, 0, 0, __bf_shf(OMNIA_INT_ ## _name), 0, 0)
+
+static inline bool is_int_bit_valid(const struct omnia_gpio *gpio)
+{
+ return gpio->int_bit != OMNIA_GPIO_INVALID_INT_BIT;
+}
+
+static const struct omnia_gpio omnia_gpios[64] = {
+ /* GPIOs with value read from the 16-bit wide status */
+ [4] = _DEF_GPIO_STS(CARD_DET),
+ [5] = _DEF_GPIO_STS(MSATA_IND),
+ [6] = _DEF_GPIO_STS(USB30_OVC),
+ [7] = _DEF_GPIO_STS(USB31_OVC),
+ [8] = _DEF_GPIO_CTL(USB30_PWRON),
+ [9] = _DEF_GPIO_CTL(USB31_PWRON),
+
+ /* brightness changed interrupt, no GPIO */
+ [11] = _DEF_INT(BRIGHTNESS_CHANGED),
+
+ [12] = _DEF_GPIO_STS(BUTTON_PRESSED),
+
+ /* TRNG interrupt, no GPIO */
+ [13] = _DEF_INT(TRNG),
+
+ /* MESSAGE_SIGNED interrupt, no GPIO */
+ [14] = _DEF_INT(MESSAGE_SIGNED),
+
+ /* GPIOs with value read from the 32-bit wide extended status */
+ [16] = _DEF_GPIO_EXT_STS(SFP_nDET, PERIPH_MCU),
+ [28] = _DEF_GPIO_EXT_STS_LEDALL(WLAN0_MSATA_LED),
+ [29] = _DEF_GPIO_EXT_STS_LEDALL(WLAN1_LED),
+ [30] = _DEF_GPIO_EXT_STS_LEDALL(WLAN2_LED),
+ [31] = _DEF_GPIO_EXT_STS_LED(WPAN0_LED, EXT),
+ [32] = _DEF_GPIO_EXT_STS_LED(WPAN1_LED, EXT),
+ [33] = _DEF_GPIO_EXT_STS_LED(WPAN2_LED, EXT),
+ [34] = _DEF_GPIO_EXT_STS_LEDALL(WAN_LED0),
+ [35] = _DEF_GPIO_EXT_STS_LED(WAN_LED1, EXT_V32),
+ [36] = _DEF_GPIO_EXT_STS_LEDALL(LAN0_LED0),
+ [37] = _DEF_GPIO_EXT_STS_LEDALL(LAN0_LED1),
+ [38] = _DEF_GPIO_EXT_STS_LEDALL(LAN1_LED0),
+ [39] = _DEF_GPIO_EXT_STS_LEDALL(LAN1_LED1),
+ [40] = _DEF_GPIO_EXT_STS_LEDALL(LAN2_LED0),
+ [41] = _DEF_GPIO_EXT_STS_LEDALL(LAN2_LED1),
+ [42] = _DEF_GPIO_EXT_STS_LEDALL(LAN3_LED0),
+ [43] = _DEF_GPIO_EXT_STS_LEDALL(LAN3_LED1),
+ [44] = _DEF_GPIO_EXT_STS_LEDALL(LAN4_LED0),
+ [45] = _DEF_GPIO_EXT_STS_LEDALL(LAN4_LED1),
+ [46] = _DEF_GPIO_EXT_STS_LEDALL(LAN5_LED0),
+ [47] = _DEF_GPIO_EXT_STS_LEDALL(LAN5_LED1),
+
+ /* GPIOs with value read from the 16-bit wide extended control status */
+ [48] = _DEF_GPIO_EXT_CTL(nRES_MMC, PERIPH_MCU),
+ [49] = _DEF_GPIO_EXT_CTL(nRES_LAN, PERIPH_MCU),
+ [50] = _DEF_GPIO_EXT_CTL(nRES_PHY, PERIPH_MCU),
+ [51] = _DEF_GPIO_EXT_CTL(nPERST0, PERIPH_MCU),
+ [52] = _DEF_GPIO_EXT_CTL(nPERST1, PERIPH_MCU),
+ [53] = _DEF_GPIO_EXT_CTL(nPERST2, PERIPH_MCU),
+ [54] = _DEF_GPIO_EXT_CTL(PHY_SFP, PERIPH_MCU),
+ [56] = _DEF_GPIO_EXT_CTL(nVHV_CTRL, PERIPH_MCU),
+};
+
+/* mapping from interrupts to indexes of GPIOs in the omnia_gpios array */
+const u8 omnia_int_to_gpio_idx[32] = {
+ [__bf_shf(OMNIA_INT_CARD_DET)] = 4,
+ [__bf_shf(OMNIA_INT_MSATA_IND)] = 5,
+ [__bf_shf(OMNIA_INT_USB30_OVC)] = 6,
+ [__bf_shf(OMNIA_INT_USB31_OVC)] = 7,
+ [__bf_shf(OMNIA_INT_BUTTON_PRESSED)] = 12,
+ [__bf_shf(OMNIA_INT_TRNG)] = 13,
+ [__bf_shf(OMNIA_INT_MESSAGE_SIGNED)] = 14,
+ [__bf_shf(OMNIA_INT_SFP_nDET)] = 16,
+ [__bf_shf(OMNIA_INT_BRIGHTNESS_CHANGED)] = 11,
+ [__bf_shf(OMNIA_INT_WLAN0_MSATA_LED)] = 28,
+ [__bf_shf(OMNIA_INT_WLAN1_LED)] = 29,
+ [__bf_shf(OMNIA_INT_WLAN2_LED)] = 30,
+ [__bf_shf(OMNIA_INT_WPAN0_LED)] = 31,
+ [__bf_shf(OMNIA_INT_WPAN1_LED)] = 32,
+ [__bf_shf(OMNIA_INT_WPAN2_LED)] = 33,
+ [__bf_shf(OMNIA_INT_WAN_LED0)] = 34,
+ [__bf_shf(OMNIA_INT_WAN_LED1)] = 35,
+ [__bf_shf(OMNIA_INT_LAN0_LED0)] = 36,
+ [__bf_shf(OMNIA_INT_LAN0_LED1)] = 37,
+ [__bf_shf(OMNIA_INT_LAN1_LED0)] = 38,
+ [__bf_shf(OMNIA_INT_LAN1_LED1)] = 39,
+ [__bf_shf(OMNIA_INT_LAN2_LED0)] = 40,
+ [__bf_shf(OMNIA_INT_LAN2_LED1)] = 41,
+ [__bf_shf(OMNIA_INT_LAN3_LED0)] = 42,
+ [__bf_shf(OMNIA_INT_LAN3_LED1)] = 43,
+ [__bf_shf(OMNIA_INT_LAN4_LED0)] = 44,
+ [__bf_shf(OMNIA_INT_LAN4_LED1)] = 45,
+ [__bf_shf(OMNIA_INT_LAN5_LED0)] = 46,
+ [__bf_shf(OMNIA_INT_LAN5_LED1)] = 47,
+};
+
+/* index of PHY_SFP GPIO in the omnia_gpios array */
+#define OMNIA_GPIO_PHY_SFP_OFFSET 54
+
+static int omnia_ctl_cmd_locked(struct omnia_mcu *mcu, u8 cmd, u16 val, u16 mask)
+{
+ unsigned int len;
+ u8 buf[5];
+
+ buf[0] = cmd;
+
+ switch (cmd) {
+ case OMNIA_CMD_GENERAL_CONTROL:
+ buf[1] = val;
+ buf[2] = mask;
+ len = 3;
+ break;
+
+ case OMNIA_CMD_EXT_CONTROL:
+ put_unaligned_le16(val, &buf[1]);
+ put_unaligned_le16(mask, &buf[3]);
+ len = 5;
+ break;
+
+ default:
+ BUG();
+ }
+
+ return omnia_cmd_write(mcu->client, buf, len);
+}
+
+static int omnia_ctl_cmd(struct omnia_mcu *mcu, u8 cmd, u16 val, u16 mask)
+{
+ guard(mutex)(&mcu->lock);
+
+ return omnia_ctl_cmd_locked(mcu, cmd, val, mask);
+}
+
+static int omnia_gpio_request(struct gpio_chip *gc, unsigned int offset)
+{
+ if (!omnia_gpios[offset].cmd)
+ return -EINVAL;
+
+ return 0;
+}
+
+static int omnia_gpio_get_direction(struct gpio_chip *gc, unsigned int offset)
+{
+ struct omnia_mcu *mcu = gpiochip_get_data(gc);
+
+ if (offset == OMNIA_GPIO_PHY_SFP_OFFSET) {
+ int val;
+
+ scoped_guard(mutex, &mcu->lock) {
+ val = omnia_cmd_read_bit(mcu->client,
+ OMNIA_CMD_GET_EXT_CONTROL_STATUS,
+ OMNIA_EXT_CTL_PHY_SFP_AUTO);
+ if (val < 0)
+ return val;
+ }
+
+ if (val)
+ return GPIO_LINE_DIRECTION_IN;
+
+ return GPIO_LINE_DIRECTION_OUT;
+ }
+
+ if (omnia_gpios[offset].ctl_cmd)
+ return GPIO_LINE_DIRECTION_OUT;
+
+ return GPIO_LINE_DIRECTION_IN;
+}
+
+static int omnia_gpio_direction_input(struct gpio_chip *gc, unsigned int offset)
+{
+ const struct omnia_gpio *gpio = &omnia_gpios[offset];
+ struct omnia_mcu *mcu = gpiochip_get_data(gc);
+
+ if (offset == OMNIA_GPIO_PHY_SFP_OFFSET)
+ return omnia_ctl_cmd(mcu, OMNIA_CMD_EXT_CONTROL,
+ OMNIA_EXT_CTL_PHY_SFP_AUTO,
+ OMNIA_EXT_CTL_PHY_SFP_AUTO);
+
+ if (gpio->ctl_cmd)
+ return -ENOTSUPP;
+
+ return 0;
+}
+
+static int omnia_gpio_direction_output(struct gpio_chip *gc,
+ unsigned int offset, int value)
+{
+ const struct omnia_gpio *gpio = &omnia_gpios[offset];
+ struct omnia_mcu *mcu = gpiochip_get_data(gc);
+ u16 val, mask;
+
+ if (!gpio->ctl_cmd)
+ return -ENOTSUPP;
+
+ mask = BIT(gpio->ctl_bit);
+ val = value ? mask : 0;
+
+ if (offset == OMNIA_GPIO_PHY_SFP_OFFSET)
+ mask |= OMNIA_EXT_CTL_PHY_SFP_AUTO;
+
+ return omnia_ctl_cmd(mcu, gpio->ctl_cmd, val, mask);
+}
+
+static int omnia_gpio_get(struct gpio_chip *gc, unsigned int offset)
+{
+ const struct omnia_gpio *gpio = &omnia_gpios[offset];
+ struct omnia_mcu *mcu = gpiochip_get_data(gc);
+
+ /*
+ * If firmware does not support the new interrupt API, we are informed
+ * of every change of the status word by an interrupt from MCU and save
+ * its value in the interrupt service routine. Simply return the saved
+ * value.
+ */
+ if (gpio->cmd == OMNIA_CMD_GET_STATUS_WORD &&
+ !(mcu->features & OMNIA_FEAT_NEW_INT_API))
+ return test_bit(gpio->bit, &mcu->last_status);
+
+ guard(mutex)(&mcu->lock);
+
+ /*
+ * If firmware does support the new interrupt API, we may have cached
+ * the value of a GPIO in the interrupt service routine. If not, read
+ * the relevant bit now.
+ */
+ if (is_int_bit_valid(gpio) && test_bit(gpio->int_bit, &mcu->is_cached))
+ return test_bit(gpio->int_bit, &mcu->cached);
+
+ return omnia_cmd_read_bit(mcu->client, gpio->cmd, BIT(gpio->bit));
+}
+
+static unsigned long *
+_relevant_field_for_sts_cmd(u8 cmd, unsigned long *sts, unsigned long *ext_sts,
+ unsigned long *ext_ctl)
+{
+ switch (cmd) {
+ case OMNIA_CMD_GET_STATUS_WORD:
+ return sts;
+ case OMNIA_CMD_GET_EXT_STATUS_DWORD:
+ return ext_sts;
+ case OMNIA_CMD_GET_EXT_CONTROL_STATUS:
+ return ext_ctl;
+ default:
+ return NULL;
+ }
+}
+
+static int omnia_gpio_get_multiple(struct gpio_chip *gc, unsigned long *mask,
+ unsigned long *bits)
+{
+ unsigned long sts = 0, ext_sts = 0, ext_ctl = 0, *field;
+ struct omnia_mcu *mcu = gpiochip_get_data(gc);
+ struct i2c_client *client = mcu->client;
+ unsigned int i;
+ int err;
+
+ /* determine which bits to read from the 3 possible commands */
+ for_each_set_bit(i, mask, ARRAY_SIZE(omnia_gpios)) {
+ field = _relevant_field_for_sts_cmd(omnia_gpios[i].cmd,
+ &sts, &ext_sts, &ext_ctl);
+ if (!field)
+ continue;
+
+ __set_bit(omnia_gpios[i].bit, field);
+ }
+
+ guard(mutex)(&mcu->lock);
+
+ if (mcu->features & OMNIA_FEAT_NEW_INT_API) {
+ /* read relevant bits from status */
+ err = omnia_cmd_read_bits(client, OMNIA_CMD_GET_STATUS_WORD,
+ sts, &sts);
+ if (err)
+ return err;
+ } else {
+ /*
+ * Use status word value cached in the interrupt service routine
+ * if firmware does not support the new interrupt API.
+ */
+ sts = mcu->last_status;
+ }
+
+ /* read relevant bits from extended status */
+ err = omnia_cmd_read_bits(client, OMNIA_CMD_GET_EXT_STATUS_DWORD,
+ ext_sts, &ext_sts);
+ if (err)
+ return err;
+
+ /* read relevant bits from extended control */
+ err = omnia_cmd_read_bits(client, OMNIA_CMD_GET_EXT_CONTROL_STATUS,
+ ext_ctl, &ext_ctl);
+ if (err)
+ return err;
+
+ /* assign relevant bits in result */
+ for_each_set_bit(i, mask, ARRAY_SIZE(omnia_gpios)) {
+ field = _relevant_field_for_sts_cmd(omnia_gpios[i].cmd,
+ &sts, &ext_sts, &ext_ctl);
+ if (!field)
+ continue;
+
+ __assign_bit(i, bits, test_bit(omnia_gpios[i].bit, field));
+ }
+
+ return 0;
+}
+
+static void omnia_gpio_set(struct gpio_chip *gc, unsigned int offset, int value)
+{
+ const struct omnia_gpio *gpio = &omnia_gpios[offset];
+ struct omnia_mcu *mcu = gpiochip_get_data(gc);
+ u16 val, mask;
+
+ if (!gpio->ctl_cmd)
+ return;
+
+ mask = BIT(gpio->ctl_bit);
+ val = value ? mask : 0;
+
+ omnia_ctl_cmd(mcu, gpio->ctl_cmd, val, mask);
+}
+
+static void omnia_gpio_set_multiple(struct gpio_chip *gc, unsigned long *mask,
+ unsigned long *bits)
+{
+ unsigned long ctl = 0, ctl_mask = 0, ext_ctl = 0, ext_ctl_mask = 0;
+ struct omnia_mcu *mcu = gpiochip_get_data(gc);
+ unsigned int i;
+
+ for_each_set_bit(i, mask, ARRAY_SIZE(omnia_gpios)) {
+ unsigned long *field, *field_mask;
+ u8 bit = omnia_gpios[i].ctl_bit;
+
+ switch (omnia_gpios[i].ctl_cmd) {
+ case OMNIA_CMD_GENERAL_CONTROL:
+ field = &ctl;
+ field_mask = &ctl_mask;
+ break;
+ case OMNIA_CMD_EXT_CONTROL:
+ field = &ext_ctl;
+ field_mask = &ext_ctl_mask;
+ break;
+ default:
+ field = field_mask = NULL;
+ break;
+ }
+
+ if (!field)
+ continue;
+
+ __set_bit(bit, field_mask);
+ __assign_bit(bit, field, test_bit(i, bits));
+ }
+
+ guard(mutex)(&mcu->lock);
+
+ if (ctl_mask)
+ omnia_ctl_cmd_locked(mcu, OMNIA_CMD_GENERAL_CONTROL,
+ ctl, ctl_mask);
+
+ if (ext_ctl_mask)
+ omnia_ctl_cmd_locked(mcu, OMNIA_CMD_EXT_CONTROL,
+ ext_ctl, ext_ctl_mask);
+}
+
+static bool omnia_gpio_available(struct omnia_mcu *mcu,
+ const struct omnia_gpio *gpio)
+{
+ if (gpio->feat_mask)
+ return (mcu->features & gpio->feat_mask) == gpio->feat;
+
+ if (gpio->feat)
+ return mcu->features & gpio->feat;
+
+ return true;
+}
+
+static int omnia_gpio_init_valid_mask(struct gpio_chip *gc,
+ unsigned long *valid_mask,
+ unsigned int ngpios)
+{
+ struct omnia_mcu *mcu = gpiochip_get_data(gc);
+
+ for (unsigned int i = 0; i < ngpios; i++) {
+ const struct omnia_gpio *gpio = &omnia_gpios[i];
+
+ if (gpio->cmd || is_int_bit_valid(gpio))
+ __assign_bit(i, valid_mask,
+ omnia_gpio_available(mcu, gpio));
+ else
+ __clear_bit(i, valid_mask);
+ }
+
+ return 0;
+}
+
+static int omnia_gpio_of_xlate(struct gpio_chip *gc,
+ const struct of_phandle_args *gpiospec,
+ u32 *flags)
+{
+ u32 bank, gpio;
+
+ if (WARN_ON(gpiospec->args_count != 3))
+ return -EINVAL;
+
+ if (flags)
+ *flags = gpiospec->args[2];
+
+ bank = gpiospec->args[0];
+ gpio = gpiospec->args[1];
+
+ switch (bank) {
+ case 0:
+ return gpio < 16 ? gpio : -EINVAL;
+ case 1:
+ return gpio < 32 ? 16 + gpio : -EINVAL;
+ case 2:
+ return gpio < 16 ? 48 + gpio : -EINVAL;
+ default:
+ return -EINVAL;
+ }
+}
+
+static void omnia_irq_shutdown(struct irq_data *d)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct omnia_mcu *mcu = gpiochip_get_data(gc);
+ irq_hw_number_t hwirq = irqd_to_hwirq(d);
+ u8 bit = omnia_gpios[hwirq].int_bit;
+
+ __clear_bit(bit, &mcu->rising);
+ __clear_bit(bit, &mcu->falling);
+}
+
+static void omnia_irq_mask(struct irq_data *d)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct omnia_mcu *mcu = gpiochip_get_data(gc);
+ irq_hw_number_t hwirq = irqd_to_hwirq(d);
+ u8 bit = omnia_gpios[hwirq].int_bit;
+
+ if (!omnia_gpios[hwirq].cmd)
+ __clear_bit(bit, &mcu->rising);
+ __clear_bit(bit, &mcu->mask);
+ gpiochip_disable_irq(gc, hwirq);
+}
+
+static void omnia_irq_unmask(struct irq_data *d)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct omnia_mcu *mcu = gpiochip_get_data(gc);
+ irq_hw_number_t hwirq = irqd_to_hwirq(d);
+ u8 bit = omnia_gpios[hwirq].int_bit;
+
+ gpiochip_enable_irq(gc, hwirq);
+ __set_bit(bit, &mcu->mask);
+ if (!omnia_gpios[hwirq].cmd)
+ __set_bit(bit, &mcu->rising);
+}
+
+static int omnia_irq_set_type(struct irq_data *d, unsigned int type)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct omnia_mcu *mcu = gpiochip_get_data(gc);
+ irq_hw_number_t hwirq = irqd_to_hwirq(d);
+ struct device *dev = &mcu->client->dev;
+ u8 bit = omnia_gpios[hwirq].int_bit;
+
+ if (!(type & IRQ_TYPE_EDGE_BOTH)) {
+ dev_err(dev, "irq %u: unsupported type %u\n", d->irq, type);
+ return -EINVAL;
+ }
+
+ __assign_bit(bit, &mcu->rising, type & IRQ_TYPE_EDGE_RISING);
+ __assign_bit(bit, &mcu->falling, type & IRQ_TYPE_EDGE_FALLING);
+
+ return 0;
+}
+
+static void omnia_irq_bus_lock(struct irq_data *d)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct omnia_mcu *mcu = gpiochip_get_data(gc);
+
+ /* nothing to do if MCU firmware does not support new interrupt API */
+ if (!(mcu->features & OMNIA_FEAT_NEW_INT_API))
+ return;
+
+ mutex_lock(&mcu->lock);
+}
+
+/**
+ * omnia_mask_interleave - Interleaves the bytes from @rising and @falling
+ * @dst: the destination u8 array of interleaved bytes
+ * @rising: rising mask
+ * @falling: falling mask
+ *
+ * Interleaves the little-endian bytes from @rising and @falling words.
+ *
+ * If @rising = (r0, r1, r2, r3) and @falling = (f0, f1, f2, f3), the result is
+ * @dst = (r0, f0, r1, f1, r2, f2, r3, f3).
+ *
+ * The MCU receives an interrupt mask and reports a pending interrupt bitmap in
+ * this interleaved format. The rationale behind this is that the low-indexed
+ * bits are more important - in many cases, the user will be interested only in
+ * interrupts with indexes 0 to 7, and so the system can stop reading after
+ * first 2 bytes (r0, f0), to save time on the slow I2C bus.
+ *
+ * Feel free to remove this function and its inverse, omnia_mask_deinterleave,
+ * and use an appropriate bitmap_*() function once such a function exists.
+ */
+static void
+omnia_mask_interleave(u8 *dst, unsigned long rising, unsigned long falling)
+{
+ for (unsigned int i = 0; i < sizeof(u32); i++) {
+ dst[2 * i] = rising >> (8 * i);
+ dst[2 * i + 1] = falling >> (8 * i);
+ }
+}
+
+/**
+ * omnia_mask_deinterleave - Deinterleaves the bytes into @rising and @falling
+ * @src: the source u8 array containing the interleaved bytes
+ * @rising: pointer where to store the rising mask gathered from @src
+ * @falling: pointer where to store the falling mask gathered from @src
+ *
+ * This is the inverse function to omnia_mask_interleave.
+ */
+static void omnia_mask_deinterleave(const u8 *src, unsigned long *rising,
+ unsigned long *falling)
+{
+ *rising = *falling = 0;
+
+ for (unsigned int i = 0; i < sizeof(u32); i++) {
+ *rising |= src[2 * i] << (8 * i);
+ *falling |= src[2 * i + 1] << (8 * i);
+ }
+}
+
+static void omnia_irq_bus_sync_unlock(struct irq_data *d)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct omnia_mcu *mcu = gpiochip_get_data(gc);
+ struct device *dev = &mcu->client->dev;
+ u8 cmd[1 + OMNIA_CMD_INT_ARG_LEN];
+ unsigned long rising, falling;
+ int err;
+
+ /* nothing to do if MCU firmware does not support new interrupt API */
+ if (!(mcu->features & OMNIA_FEAT_NEW_INT_API))
+ return;
+
+ cmd[0] = OMNIA_CMD_SET_INT_MASK;
+
+ rising = mcu->rising & mcu->mask;
+ falling = mcu->falling & mcu->mask;
+
+ /* interleave the rising and falling bytes into the command arguments */
+ omnia_mask_interleave(&cmd[1], rising, falling);
+
+ dev_dbg(dev, "set int mask %8ph\n", &cmd[1]);
+
+ err = omnia_cmd_write(mcu->client, cmd, sizeof(cmd));
+ if (err) {
+ dev_err(dev, "Cannot set mask: %d\n", err);
+ goto unlock;
+ }
+
+ /*
+ * Remember which GPIOs have both rising and falling interrupts enabled.
+ * For those we will cache their value so that .get() method is faster.
+ * We also need to forget cached values of GPIOs that aren't cached
+ * anymore.
+ */
+ mcu->both = rising & falling;
+ mcu->is_cached &= mcu->both;
+
+unlock:
+ mutex_unlock(&mcu->lock);
+}
+
+static const struct irq_chip omnia_mcu_irq_chip = {
+ .name = "Turris Omnia MCU interrupts",
+ .irq_shutdown = omnia_irq_shutdown,
+ .irq_mask = omnia_irq_mask,
+ .irq_unmask = omnia_irq_unmask,
+ .irq_set_type = omnia_irq_set_type,
+ .irq_bus_lock = omnia_irq_bus_lock,
+ .irq_bus_sync_unlock = omnia_irq_bus_sync_unlock,
+ .flags = IRQCHIP_IMMUTABLE,
+ GPIOCHIP_IRQ_RESOURCE_HELPERS,
+};
+
+static void omnia_irq_init_valid_mask(struct gpio_chip *gc,
+ unsigned long *valid_mask,
+ unsigned int ngpios)
+{
+ struct omnia_mcu *mcu = gpiochip_get_data(gc);
+
+ for (unsigned int i = 0; i < ngpios; i++) {
+ const struct omnia_gpio *gpio = &omnia_gpios[i];
+
+ if (is_int_bit_valid(gpio))
+ __assign_bit(i, valid_mask,
+ omnia_gpio_available(mcu, gpio));
+ else
+ __clear_bit(i, valid_mask);
+ }
+}
+
+static int omnia_irq_init_hw(struct gpio_chip *gc)
+{
+ struct omnia_mcu *mcu = gpiochip_get_data(gc);
+ u8 cmd[1 + OMNIA_CMD_INT_ARG_LEN] = {};
+
+ cmd[0] = OMNIA_CMD_SET_INT_MASK;
+
+ return omnia_cmd_write(mcu->client, cmd, sizeof(cmd));
+}
+
+/*
+ * Determine how many bytes we need to read from the reply to the
+ * OMNIA_CMD_GET_INT_AND_CLEAR command in order to retrieve all unmasked
+ * interrupts.
+ */
+static unsigned int
+omnia_irq_compute_pending_length(unsigned long rising, unsigned long falling)
+{
+ return max(omnia_compute_reply_length(rising, true, 0),
+ omnia_compute_reply_length(falling, true, 1));
+}
+
+static bool omnia_irq_read_pending_new(struct omnia_mcu *mcu,
+ unsigned long *pending)
+{
+ struct device *dev = &mcu->client->dev;
+ u8 reply[OMNIA_CMD_INT_ARG_LEN] = {};
+ unsigned long rising, falling;
+ unsigned int len;
+ int err;
+
+ len = omnia_irq_compute_pending_length(mcu->rising & mcu->mask,
+ mcu->falling & mcu->mask);
+ if (!len)
+ return false;
+
+ guard(mutex)(&mcu->lock);
+
+ err = omnia_cmd_read(mcu->client, OMNIA_CMD_GET_INT_AND_CLEAR, reply,
+ len);
+ if (err) {
+ dev_err(dev, "Cannot read pending IRQs: %d\n", err);
+ return false;
+ }
+
+ /* deinterleave the reply bytes into rising and falling */
+ omnia_mask_deinterleave(reply, &rising, &falling);
+
+ rising &= mcu->mask;
+ falling &= mcu->mask;
+ *pending = rising | falling;
+
+ /* cache values for GPIOs that have both edges enabled */
+ mcu->is_cached &= ~(rising & falling);
+ mcu->is_cached |= mcu->both & (rising ^ falling);
+ mcu->cached = (mcu->cached | rising) & ~falling;
+
+ return true;
+}
+
+static int omnia_read_status_word_old_fw(struct omnia_mcu *mcu,
+ unsigned long *status)
+{
+ u16 raw_status;
+ int err;
+
+ err = omnia_cmd_read_u16(mcu->client, OMNIA_CMD_GET_STATUS_WORD,
+ &raw_status);
+ if (err)
+ return err;
+
+ /*
+ * Old firmware has a bug wherein it never resets the USB port
+ * overcurrent bits back to zero. Ignore them.
+ */
+ *status = raw_status & ~(OMNIA_STS_USB30_OVC | OMNIA_STS_USB31_OVC);
+
+ return 0;
+}
+
+static void button_release_emul_fn(struct work_struct *work)
+{
+ struct omnia_mcu *mcu = container_of(to_delayed_work(work),
+ struct omnia_mcu,
+ button_release_emul_work);
+
+ mcu->button_pressed_emul = false;
+ generic_handle_irq_safe(mcu->client->irq);
+}
+
+static void
+fill_int_from_sts(unsigned long *rising, unsigned long *falling,
+ unsigned long rising_sts, unsigned long falling_sts,
+ unsigned long sts_bit, unsigned long int_bit)
+{
+ if (rising_sts & sts_bit)
+ *rising |= int_bit;
+ if (falling_sts & sts_bit)
+ *falling |= int_bit;
+}
+
+static bool omnia_irq_read_pending_old(struct omnia_mcu *mcu,
+ unsigned long *pending)
+{
+ unsigned long status, rising_sts, falling_sts, rising, falling;
+ struct device *dev = &mcu->client->dev;
+ int err;
+
+ guard(mutex)(&mcu->lock);
+
+ err = omnia_read_status_word_old_fw(mcu, &status);
+ if (err) {
+ dev_err(dev, "Cannot read pending IRQs: %d\n", err);
+ return false;
+ }
+
+ /*
+ * The old firmware triggers an interrupt whenever status word changes,
+ * but does not inform about which bits rose or fell. We need to compute
+ * this here by comparing with the last status word value.
+ *
+ * The OMNIA_STS_BUTTON_PRESSED bit needs special handling, because the
+ * old firmware clears the OMNIA_STS_BUTTON_PRESSED bit on successful
+ * completion of the OMNIA_CMD_GET_STATUS_WORD command, resulting in
+ * another interrupt:
+ * - first we get an interrupt, we read the status word where
+ * OMNIA_STS_BUTTON_PRESSED is present,
+ * - MCU clears the OMNIA_STS_BUTTON_PRESSED bit because we read the
+ * status word,
+ * - we get another interrupt because the status word changed again
+ * (the OMNIA_STS_BUTTON_PRESSED bit was cleared).
+ *
+ * The gpiolib-cdev, gpiolib-sysfs and gpio-keys input driver all call
+ * the gpiochip's .get() method after an edge event on a requested GPIO
+ * occurs.
+ *
+ * We ensure that the .get() method reads 1 for the button GPIO for some
+ * time.
+ */
+
+ if (status & OMNIA_STS_BUTTON_PRESSED) {
+ mcu->button_pressed_emul = true;
+ mod_delayed_work(system_wq, &mcu->button_release_emul_work,
+ msecs_to_jiffies(FRONT_BUTTON_RELEASE_DELAY_MS));
+ } else if (mcu->button_pressed_emul) {
+ status |= OMNIA_STS_BUTTON_PRESSED;
+ }
+
+ rising_sts = ~mcu->last_status & status;
+ falling_sts = mcu->last_status & ~status;
+
+ mcu->last_status = status;
+
+ /*
+ * Fill in the relevant interrupt bits from status bits for CARD_DET,
+ * MSATA_IND and BUTTON_PRESSED.
+ */
+ rising = 0;
+ falling = 0;
+ fill_int_from_sts(&rising, &falling, rising_sts, falling_sts,
+ OMNIA_STS_CARD_DET, OMNIA_INT_CARD_DET);
+ fill_int_from_sts(&rising, &falling, rising_sts, falling_sts,
+ OMNIA_STS_MSATA_IND, OMNIA_INT_MSATA_IND);
+ fill_int_from_sts(&rising, &falling, rising_sts, falling_sts,
+ OMNIA_STS_BUTTON_PRESSED, OMNIA_INT_BUTTON_PRESSED);
+
+ /* Use only bits that are enabled */
+ rising &= mcu->rising & mcu->mask;
+ falling &= mcu->falling & mcu->mask;
+ *pending = rising | falling;
+
+ return true;
+}
+
+static bool omnia_irq_read_pending(struct omnia_mcu *mcu,
+ unsigned long *pending)
+{
+ if (mcu->features & OMNIA_FEAT_NEW_INT_API)
+ return omnia_irq_read_pending_new(mcu, pending);
+ else
+ return omnia_irq_read_pending_old(mcu, pending);
+}
+
+static irqreturn_t omnia_irq_thread_handler(int irq, void *dev_id)
+{
+ struct omnia_mcu *mcu = dev_id;
+ struct irq_domain *domain;
+ unsigned long pending;
+ unsigned int i;
+
+ if (!omnia_irq_read_pending(mcu, &pending))
+ return IRQ_NONE;
+
+ domain = mcu->gc.irq.domain;
+
+ for_each_set_bit(i, &pending, 32) {
+ unsigned int nested_irq;
+
+ nested_irq = irq_find_mapping(domain, omnia_int_to_gpio_idx[i]);
+
+ handle_nested_irq(nested_irq);
+ }
+
+ return IRQ_RETVAL(pending);
+}
+
+static const char * const front_button_modes[] = { "mcu", "cpu" };
+
+static ssize_t front_button_mode_show(struct device *dev,
+ struct device_attribute *a, char *buf)
+{
+ struct omnia_mcu *mcu = dev_get_drvdata(dev);
+ int val;
+
+ if (mcu->features & OMNIA_FEAT_NEW_INT_API) {
+ val = omnia_cmd_read_bit(mcu->client, OMNIA_CMD_GET_STATUS_WORD,
+ OMNIA_STS_BUTTON_MODE);
+ if (val < 0)
+ return val;
+ } else {
+ val = !!(mcu->last_status & OMNIA_STS_BUTTON_MODE);
+ }
+
+ return sysfs_emit(buf, "%s\n", front_button_modes[val]);
+}
+
+static ssize_t front_button_mode_store(struct device *dev,
+ struct device_attribute *a,
+ const char *buf, size_t count)
+{
+ struct omnia_mcu *mcu = dev_get_drvdata(dev);
+ int err, i;
+
+ i = sysfs_match_string(front_button_modes, buf);
+ if (i < 0)
+ return i;
+
+ err = omnia_ctl_cmd_locked(mcu, OMNIA_CMD_GENERAL_CONTROL,
+ i ? OMNIA_CTL_BUTTON_MODE : 0,
+ OMNIA_CTL_BUTTON_MODE);
+ if (err)
+ return err;
+
+ return count;
+}
+static DEVICE_ATTR_RW(front_button_mode);
+
+static struct attribute *omnia_mcu_gpio_attrs[] = {
+ &dev_attr_front_button_mode.attr,
+ NULL
+};
+
+const struct attribute_group omnia_mcu_gpio_group = {
+ .attrs = omnia_mcu_gpio_attrs,
+};
+
+int omnia_mcu_register_gpiochip(struct omnia_mcu *mcu)
+{
+ bool new_api = mcu->features & OMNIA_FEAT_NEW_INT_API;
+ struct device *dev = &mcu->client->dev;
+ unsigned long irqflags;
+ int err;
+
+ err = devm_mutex_init(dev, &mcu->lock);
+ if (err)
+ return err;
+
+ mcu->gc.request = omnia_gpio_request;
+ mcu->gc.get_direction = omnia_gpio_get_direction;
+ mcu->gc.direction_input = omnia_gpio_direction_input;
+ mcu->gc.direction_output = omnia_gpio_direction_output;
+ mcu->gc.get = omnia_gpio_get;
+ mcu->gc.get_multiple = omnia_gpio_get_multiple;
+ mcu->gc.set = omnia_gpio_set;
+ mcu->gc.set_multiple = omnia_gpio_set_multiple;
+ mcu->gc.init_valid_mask = omnia_gpio_init_valid_mask;
+ mcu->gc.can_sleep = true;
+ mcu->gc.names = omnia_mcu_gpio_templates;
+ mcu->gc.base = -1;
+ mcu->gc.ngpio = ARRAY_SIZE(omnia_gpios);
+ mcu->gc.label = "Turris Omnia MCU GPIOs";
+ mcu->gc.parent = dev;
+ mcu->gc.owner = THIS_MODULE;
+ mcu->gc.of_gpio_n_cells = 3;
+ mcu->gc.of_xlate = omnia_gpio_of_xlate;
+
+ gpio_irq_chip_set_chip(&mcu->gc.irq, &omnia_mcu_irq_chip);
+ /* This will let us handle the parent IRQ in the driver */
+ mcu->gc.irq.parent_handler = NULL;
+ mcu->gc.irq.num_parents = 0;
+ mcu->gc.irq.parents = NULL;
+ mcu->gc.irq.default_type = IRQ_TYPE_NONE;
+ mcu->gc.irq.handler = handle_bad_irq;
+ mcu->gc.irq.threaded = true;
+ if (new_api)
+ mcu->gc.irq.init_hw = omnia_irq_init_hw;
+ mcu->gc.irq.init_valid_mask = omnia_irq_init_valid_mask;
+
+ err = devm_gpiochip_add_data(dev, &mcu->gc, mcu);
+ if (err)
+ return dev_err_probe(dev, err, "Cannot add GPIO chip\n");
+
+ /*
+ * Before requesting the interrupt, if firmware does not support the new
+ * interrupt API, we need to cache the value of the status word, so that
+ * when it changes, we may compare the new value with the cached one in
+ * the interrupt handler.
+ */
+ if (!new_api) {
+ err = omnia_read_status_word_old_fw(mcu, &mcu->last_status);
+ if (err)
+ return dev_err_probe(dev, err,
+ "Cannot read status word\n");
+
+ INIT_DELAYED_WORK(&mcu->button_release_emul_work,
+ button_release_emul_fn);
+ }
+
+ irqflags = IRQF_ONESHOT;
+ if (new_api)
+ irqflags |= IRQF_TRIGGER_LOW;
+ else
+ irqflags |= IRQF_TRIGGER_FALLING;
+
+ err = devm_request_threaded_irq(dev, mcu->client->irq, NULL,
+ omnia_irq_thread_handler, irqflags,
+ "turris-omnia-mcu", mcu);
+ if (err)
+ return dev_err_probe(dev, err, "Cannot request IRQ\n");
+
+ if (!new_api) {
+ /*
+ * The button_release_emul_work has to be initialized before the
+ * thread is requested, and on driver remove it needs to be
+ * canceled before the thread is freed. Therefore we can't use
+ * devm_delayed_work_autocancel() directly, because the order
+ * devm_delayed_work_autocancel();
+ * devm_request_threaded_irq();
+ * would cause improper release order:
+ * free_irq();
+ * cancel_delayed_work_sync();
+ * Instead we first initialize the work above, and only now
+ * after IRQ is requested we add the work devm action.
+ */
+ err = devm_add_action(dev, devm_delayed_work_drop,
+ &mcu->button_release_emul_work);
+ if (err)
+ return err;
+ }
+
+ return 0;
+}
diff --git a/drivers/platform/cznic/turris-omnia-mcu-sys-off-wakeup.c b/drivers/platform/cznic/turris-omnia-mcu-sys-off-wakeup.c
new file mode 100644
index 000000000000..0e8ab15b6037
--- /dev/null
+++ b/drivers/platform/cznic/turris-omnia-mcu-sys-off-wakeup.c
@@ -0,0 +1,260 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * CZ.NIC's Turris Omnia MCU system off and RTC wakeup driver
+ *
+ * This is not a true RTC driver (in the sense that it does not provide a
+ * real-time clock), rather the MCU implements a wakeup from powered off state
+ * at a specified time relative to MCU boot, and we expose this feature via RTC
+ * alarm, so that it can be used via the rtcwake command, which is the standard
+ * Linux command for this.
+ *
+ * 2024 by Marek Behún <kabel@kernel.org>
+ */
+
+#include <linux/crc32.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/kstrtox.h>
+#include <linux/reboot.h>
+#include <linux/rtc.h>
+#include <linux/sysfs.h>
+#include <linux/types.h>
+
+#include <linux/turris-omnia-mcu-interface.h>
+#include "turris-omnia-mcu.h"
+
+static int omnia_get_uptime_wakeup(const struct i2c_client *client, u32 *uptime,
+ u32 *wakeup)
+{
+ __le32 reply[2];
+ int err;
+
+ err = omnia_cmd_read(client, OMNIA_CMD_GET_UPTIME_AND_WAKEUP, reply,
+ sizeof(reply));
+ if (err)
+ return err;
+
+ if (uptime)
+ *uptime = le32_to_cpu(reply[0]);
+
+ if (wakeup)
+ *wakeup = le32_to_cpu(reply[1]);
+
+ return 0;
+}
+
+static int omnia_read_time(struct device *dev, struct rtc_time *tm)
+{
+ u32 uptime;
+ int err;
+
+ err = omnia_get_uptime_wakeup(to_i2c_client(dev), &uptime, NULL);
+ if (err)
+ return err;
+
+ rtc_time64_to_tm(uptime, tm);
+
+ return 0;
+}
+
+static int omnia_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct omnia_mcu *mcu = i2c_get_clientdata(client);
+ u32 wakeup;
+ int err;
+
+ err = omnia_get_uptime_wakeup(client, NULL, &wakeup);
+ if (err)
+ return err;
+
+ alrm->enabled = !!wakeup;
+ rtc_time64_to_tm(wakeup ?: mcu->rtc_alarm, &alrm->time);
+
+ return 0;
+}
+
+static int omnia_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct omnia_mcu *mcu = i2c_get_clientdata(client);
+
+ mcu->rtc_alarm = rtc_tm_to_time64(&alrm->time);
+
+ if (alrm->enabled)
+ return omnia_cmd_write_u32(client, OMNIA_CMD_SET_WAKEUP,
+ mcu->rtc_alarm);
+
+ return 0;
+}
+
+static int omnia_alarm_irq_enable(struct device *dev, unsigned int enabled)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct omnia_mcu *mcu = i2c_get_clientdata(client);
+
+ return omnia_cmd_write_u32(client, OMNIA_CMD_SET_WAKEUP,
+ enabled ? mcu->rtc_alarm : 0);
+}
+
+static const struct rtc_class_ops omnia_rtc_ops = {
+ .read_time = omnia_read_time,
+ .read_alarm = omnia_read_alarm,
+ .set_alarm = omnia_set_alarm,
+ .alarm_irq_enable = omnia_alarm_irq_enable,
+};
+
+static int omnia_power_off(struct sys_off_data *data)
+{
+ struct omnia_mcu *mcu = data->cb_data;
+ __be32 tmp;
+ u8 cmd[9];
+ u16 arg;
+ int err;
+
+ if (mcu->front_button_poweron)
+ arg = OMNIA_CMD_POWER_OFF_POWERON_BUTTON;
+ else
+ arg = 0;
+
+ cmd[0] = OMNIA_CMD_POWER_OFF;
+ put_unaligned_le16(OMNIA_CMD_POWER_OFF_MAGIC, &cmd[1]);
+ put_unaligned_le16(arg, &cmd[3]);
+
+ /*
+ * Although all values from and to MCU are passed in little-endian, the
+ * MCU's CRC unit uses big-endian CRC32 polynomial (0x04c11db7), so we
+ * need to use crc32_be() here.
+ */
+ tmp = cpu_to_be32(get_unaligned_le32(&cmd[1]));
+ put_unaligned_le32(crc32_be(~0, (void *)&tmp, sizeof(tmp)), &cmd[5]);
+
+ err = omnia_cmd_write(mcu->client, cmd, sizeof(cmd));
+ if (err)
+ dev_err(&mcu->client->dev,
+ "Unable to send the poweroff command: %d\n", err);
+
+ return NOTIFY_DONE;
+}
+
+static int omnia_restart(struct sys_off_data *data)
+{
+ struct omnia_mcu *mcu = data->cb_data;
+ u8 cmd[3];
+ int err;
+
+ cmd[0] = OMNIA_CMD_GENERAL_CONTROL;
+
+ if (reboot_mode == REBOOT_HARD)
+ cmd[1] = cmd[2] = OMNIA_CTL_HARD_RST;
+ else
+ cmd[1] = cmd[2] = OMNIA_CTL_LIGHT_RST;
+
+ err = omnia_cmd_write(mcu->client, cmd, sizeof(cmd));
+ if (err)
+ dev_err(&mcu->client->dev,
+ "Unable to send the restart command: %d\n", err);
+
+ /*
+ * MCU needs a little bit to process the I2C command, otherwise it will
+ * do a light reset based on SOC SYSRES_OUT pin.
+ */
+ mdelay(1);
+
+ return NOTIFY_DONE;
+}
+
+static ssize_t front_button_poweron_show(struct device *dev,
+ struct device_attribute *a, char *buf)
+{
+ struct omnia_mcu *mcu = dev_get_drvdata(dev);
+
+ return sysfs_emit(buf, "%d\n", mcu->front_button_poweron);
+}
+
+static ssize_t front_button_poweron_store(struct device *dev,
+ struct device_attribute *a,
+ const char *buf, size_t count)
+{
+ struct omnia_mcu *mcu = dev_get_drvdata(dev);
+ bool val;
+ int err;
+
+ err = kstrtobool(buf, &val);
+ if (err)
+ return err;
+
+ mcu->front_button_poweron = val;
+
+ return count;
+}
+static DEVICE_ATTR_RW(front_button_poweron);
+
+static struct attribute *omnia_mcu_poweroff_attrs[] = {
+ &dev_attr_front_button_poweron.attr,
+ NULL
+};
+
+static umode_t poweroff_attrs_visible(struct kobject *kobj, struct attribute *a,
+ int n)
+{
+ struct device *dev = kobj_to_dev(kobj);
+ struct omnia_mcu *mcu = dev_get_drvdata(dev);
+
+ if (mcu->features & OMNIA_FEAT_POWEROFF_WAKEUP)
+ return a->mode;
+
+ return 0;
+}
+
+const struct attribute_group omnia_mcu_poweroff_group = {
+ .attrs = omnia_mcu_poweroff_attrs,
+ .is_visible = poweroff_attrs_visible,
+};
+
+int omnia_mcu_register_sys_off_and_wakeup(struct omnia_mcu *mcu)
+{
+ struct device *dev = &mcu->client->dev;
+ int err;
+
+ /* MCU restart is always available */
+ err = devm_register_sys_off_handler(dev, SYS_OFF_MODE_RESTART,
+ SYS_OFF_PRIO_FIRMWARE,
+ omnia_restart, mcu);
+ if (err)
+ return dev_err_probe(dev, err,
+ "Cannot register system restart handler\n");
+
+ /*
+ * Poweroff and wakeup are available only if POWEROFF_WAKEUP feature is
+ * present.
+ */
+ if (!(mcu->features & OMNIA_FEAT_POWEROFF_WAKEUP))
+ return 0;
+
+ err = devm_register_sys_off_handler(dev, SYS_OFF_MODE_POWER_OFF,
+ SYS_OFF_PRIO_FIRMWARE,
+ omnia_power_off, mcu);
+ if (err)
+ return dev_err_probe(dev, err,
+ "Cannot register system power off handler\n");
+
+ mcu->rtcdev = devm_rtc_allocate_device(dev);
+ if (IS_ERR(mcu->rtcdev))
+ return dev_err_probe(dev, PTR_ERR(mcu->rtcdev),
+ "Cannot allocate RTC device\n");
+
+ mcu->rtcdev->ops = &omnia_rtc_ops;
+ mcu->rtcdev->range_max = U32_MAX;
+ set_bit(RTC_FEATURE_ALARM_WAKEUP_ONLY, mcu->rtcdev->features);
+
+ err = devm_rtc_register_device(mcu->rtcdev);
+ if (err)
+ return dev_err_probe(dev, err, "Cannot register RTC device\n");
+
+ mcu->front_button_poweron = true;
+
+ return 0;
+}
diff --git a/drivers/platform/cznic/turris-omnia-mcu-trng.c b/drivers/platform/cznic/turris-omnia-mcu-trng.c
new file mode 100644
index 000000000000..ad953fb3c37a
--- /dev/null
+++ b/drivers/platform/cznic/turris-omnia-mcu-trng.c
@@ -0,0 +1,103 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * CZ.NIC's Turris Omnia MCU TRNG driver
+ *
+ * 2024 by Marek Behún <kabel@kernel.org>
+ */
+
+#include <linux/bitfield.h>
+#include <linux/completion.h>
+#include <linux/container_of.h>
+#include <linux/errno.h>
+#include <linux/gpio/consumer.h>
+#include <linux/gpio/driver.h>
+#include <linux/hw_random.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/minmax.h>
+#include <linux/string.h>
+#include <linux/types.h>
+
+#include <linux/turris-omnia-mcu-interface.h>
+#include "turris-omnia-mcu.h"
+
+#define OMNIA_CMD_TRNG_MAX_ENTROPY_LEN 64
+
+static irqreturn_t omnia_trng_irq_handler(int irq, void *dev_id)
+{
+ struct omnia_mcu *mcu = dev_id;
+
+ complete(&mcu->trng_entropy_ready);
+
+ return IRQ_HANDLED;
+}
+
+static int omnia_trng_read(struct hwrng *rng, void *data, size_t max, bool wait)
+{
+ struct omnia_mcu *mcu = container_of(rng, struct omnia_mcu, trng);
+ u8 reply[1 + OMNIA_CMD_TRNG_MAX_ENTROPY_LEN];
+ int err, bytes;
+
+ if (!wait && !completion_done(&mcu->trng_entropy_ready))
+ return 0;
+
+ do {
+ if (wait_for_completion_interruptible(&mcu->trng_entropy_ready))
+ return -ERESTARTSYS;
+
+ err = omnia_cmd_read(mcu->client,
+ OMNIA_CMD_TRNG_COLLECT_ENTROPY,
+ reply, sizeof(reply));
+ if (err)
+ return err;
+
+ bytes = min3(reply[0], max, OMNIA_CMD_TRNG_MAX_ENTROPY_LEN);
+ } while (wait && !bytes);
+
+ memcpy(data, &reply[1], bytes);
+
+ return bytes;
+}
+
+int omnia_mcu_register_trng(struct omnia_mcu *mcu)
+{
+ struct device *dev = &mcu->client->dev;
+ u8 irq_idx, dummy;
+ int irq, err;
+
+ if (!(mcu->features & OMNIA_FEAT_TRNG))
+ return 0;
+
+ irq_idx = omnia_int_to_gpio_idx[__bf_shf(OMNIA_INT_TRNG)];
+ irq = gpiod_to_irq(gpio_device_get_desc(mcu->gc.gpiodev, irq_idx));
+ if (!irq)
+ return dev_err_probe(dev, -ENXIO, "Cannot get TRNG IRQ\n");
+
+ /*
+ * If someone else cleared the TRNG interrupt but did not read the
+ * entropy, a new interrupt won't be generated, and entropy collection
+ * will be stuck. Ensure an interrupt will be generated by executing
+ * the collect entropy command (and discarding the result).
+ */
+ err = omnia_cmd_read(mcu->client, OMNIA_CMD_TRNG_COLLECT_ENTROPY,
+ &dummy, 1);
+ if (err)
+ return err;
+
+ init_completion(&mcu->trng_entropy_ready);
+
+ err = devm_request_threaded_irq(dev, irq, NULL, omnia_trng_irq_handler,
+ IRQF_ONESHOT, "turris-omnia-mcu-trng",
+ mcu);
+ if (err)
+ return dev_err_probe(dev, err, "Cannot request TRNG IRQ\n");
+
+ mcu->trng.name = "turris-omnia-mcu-trng";
+ mcu->trng.read = omnia_trng_read;
+
+ err = devm_hwrng_register(dev, &mcu->trng);
+ if (err)
+ return dev_err_probe(dev, err, "Cannot register TRNG\n");
+
+ return 0;
+}
diff --git a/drivers/platform/cznic/turris-omnia-mcu-watchdog.c b/drivers/platform/cznic/turris-omnia-mcu-watchdog.c
new file mode 100644
index 000000000000..3ad146ec1d80
--- /dev/null
+++ b/drivers/platform/cznic/turris-omnia-mcu-watchdog.c
@@ -0,0 +1,130 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * CZ.NIC's Turris Omnia MCU watchdog driver
+ *
+ * 2024 by Marek Behún <kabel@kernel.org>
+ */
+
+#include <linux/bitops.h>
+#include <linux/device.h>
+#include <linux/i2c.h>
+#include <linux/moduleparam.h>
+#include <linux/types.h>
+#include <linux/units.h>
+#include <linux/watchdog.h>
+
+#include <linux/turris-omnia-mcu-interface.h>
+#include "turris-omnia-mcu.h"
+
+#define WATCHDOG_TIMEOUT 120
+
+static unsigned int timeout;
+module_param(timeout, int, 0);
+MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds");
+
+static bool nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, bool, 0);
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
+ __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+
+static int omnia_wdt_start(struct watchdog_device *wdt)
+{
+ struct omnia_mcu *mcu = watchdog_get_drvdata(wdt);
+
+ return omnia_cmd_write_u8(mcu->client, OMNIA_CMD_SET_WATCHDOG_STATE, 1);
+}
+
+static int omnia_wdt_stop(struct watchdog_device *wdt)
+{
+ struct omnia_mcu *mcu = watchdog_get_drvdata(wdt);
+
+ return omnia_cmd_write_u8(mcu->client, OMNIA_CMD_SET_WATCHDOG_STATE, 0);
+}
+
+static int omnia_wdt_ping(struct watchdog_device *wdt)
+{
+ struct omnia_mcu *mcu = watchdog_get_drvdata(wdt);
+
+ return omnia_cmd_write_u8(mcu->client, OMNIA_CMD_SET_WATCHDOG_STATE, 1);
+}
+
+static int omnia_wdt_set_timeout(struct watchdog_device *wdt,
+ unsigned int timeout)
+{
+ struct omnia_mcu *mcu = watchdog_get_drvdata(wdt);
+
+ return omnia_cmd_write_u16(mcu->client, OMNIA_CMD_SET_WDT_TIMEOUT,
+ timeout * DECI);
+}
+
+static unsigned int omnia_wdt_get_timeleft(struct watchdog_device *wdt)
+{
+ struct omnia_mcu *mcu = watchdog_get_drvdata(wdt);
+ u16 timeleft;
+ int err;
+
+ err = omnia_cmd_read_u16(mcu->client, OMNIA_CMD_GET_WDT_TIMELEFT,
+ &timeleft);
+ if (err) {
+ dev_err(&mcu->client->dev, "Cannot get watchdog timeleft: %d\n",
+ err);
+ return 0;
+ }
+
+ return timeleft / DECI;
+}
+
+static const struct watchdog_info omnia_wdt_info = {
+ .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
+ .identity = "Turris Omnia MCU Watchdog",
+};
+
+static const struct watchdog_ops omnia_wdt_ops = {
+ .owner = THIS_MODULE,
+ .start = omnia_wdt_start,
+ .stop = omnia_wdt_stop,
+ .ping = omnia_wdt_ping,
+ .set_timeout = omnia_wdt_set_timeout,
+ .get_timeleft = omnia_wdt_get_timeleft,
+};
+
+int omnia_mcu_register_watchdog(struct omnia_mcu *mcu)
+{
+ struct device *dev = &mcu->client->dev;
+ u8 state;
+ int err;
+
+ if (!(mcu->features & OMNIA_FEAT_WDT_PING))
+ return 0;
+
+ mcu->wdt.info = &omnia_wdt_info;
+ mcu->wdt.ops = &omnia_wdt_ops;
+ mcu->wdt.parent = dev;
+ mcu->wdt.min_timeout = 1;
+ mcu->wdt.max_timeout = 65535 / DECI;
+
+ mcu->wdt.timeout = WATCHDOG_TIMEOUT;
+ watchdog_init_timeout(&mcu->wdt, timeout, dev);
+
+ watchdog_set_drvdata(&mcu->wdt, mcu);
+
+ omnia_wdt_set_timeout(&mcu->wdt, mcu->wdt.timeout);
+
+ err = omnia_cmd_read_u8(mcu->client, OMNIA_CMD_GET_WATCHDOG_STATE,
+ &state);
+ if (err)
+ return dev_err_probe(dev, err,
+ "Cannot get MCU watchdog state\n");
+
+ if (state)
+ set_bit(WDOG_HW_RUNNING, &mcu->wdt.status);
+
+ watchdog_set_nowayout(&mcu->wdt, nowayout);
+ watchdog_stop_on_reboot(&mcu->wdt);
+ err = devm_watchdog_register_device(dev, &mcu->wdt);
+ if (err)
+ return dev_err_probe(dev, err,
+ "Cannot register MCU watchdog\n");
+
+ return 0;
+}
diff --git a/drivers/platform/cznic/turris-omnia-mcu.h b/drivers/platform/cznic/turris-omnia-mcu.h
new file mode 100644
index 000000000000..2ca56ae13aa9
--- /dev/null
+++ b/drivers/platform/cznic/turris-omnia-mcu.h
@@ -0,0 +1,194 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * CZ.NIC's Turris Omnia MCU driver
+ *
+ * 2024 by Marek Behún <kabel@kernel.org>
+ */
+
+#ifndef __TURRIS_OMNIA_MCU_H
+#define __TURRIS_OMNIA_MCU_H
+
+#include <linux/bitops.h>
+#include <linux/completion.h>
+#include <linux/gpio/driver.h>
+#include <linux/hw_random.h>
+#include <linux/if_ether.h>
+#include <linux/mutex.h>
+#include <linux/types.h>
+#include <linux/watchdog.h>
+#include <linux/workqueue.h>
+#include <asm/byteorder.h>
+#include <asm/unaligned.h>
+
+struct i2c_client;
+struct rtc_device;
+
+struct omnia_mcu {
+ struct i2c_client *client;
+ const char *type;
+ u32 features;
+
+ /* board information */
+ u64 board_serial_number;
+ u8 board_first_mac[ETH_ALEN];
+ u8 board_revision;
+
+ /* GPIO chip */
+ struct gpio_chip gc;
+ struct mutex lock;
+ unsigned long mask, rising, falling, both, cached, is_cached;
+ /* Old MCU firmware handling needs the following */
+ struct delayed_work button_release_emul_work;
+ unsigned long last_status;
+ bool button_pressed_emul;
+
+ /* RTC device for configuring wake-up */
+ struct rtc_device *rtcdev;
+ u32 rtc_alarm;
+ bool front_button_poweron;
+
+ /* MCU watchdog */
+ struct watchdog_device wdt;
+
+ /* true random number generator */
+ struct hwrng trng;
+ struct completion trng_entropy_ready;
+};
+
+int omnia_cmd_write_read(const struct i2c_client *client,
+ void *cmd, unsigned int cmd_len,
+ void *reply, unsigned int reply_len);
+
+static inline int omnia_cmd_write(const struct i2c_client *client, void *cmd,
+ unsigned int len)
+{
+ return omnia_cmd_write_read(client, cmd, len, NULL, 0);
+}
+
+static inline int omnia_cmd_write_u8(const struct i2c_client *client, u8 cmd,
+ u8 val)
+{
+ u8 buf[2] = { cmd, val };
+
+ return omnia_cmd_write(client, buf, sizeof(buf));
+}
+
+static inline int omnia_cmd_write_u16(const struct i2c_client *client, u8 cmd,
+ u16 val)
+{
+ u8 buf[3];
+
+ buf[0] = cmd;
+ put_unaligned_le16(val, &buf[1]);
+
+ return omnia_cmd_write(client, buf, sizeof(buf));
+}
+
+static inline int omnia_cmd_write_u32(const struct i2c_client *client, u8 cmd,
+ u32 val)
+{
+ u8 buf[5];
+
+ buf[0] = cmd;
+ put_unaligned_le32(val, &buf[1]);
+
+ return omnia_cmd_write(client, buf, sizeof(buf));
+}
+
+static inline int omnia_cmd_read(const struct i2c_client *client, u8 cmd,
+ void *reply, unsigned int len)
+{
+ return omnia_cmd_write_read(client, &cmd, 1, reply, len);
+}
+
+static inline unsigned int
+omnia_compute_reply_length(unsigned long mask, bool interleaved,
+ unsigned int offset)
+{
+ if (!mask)
+ return 0;
+
+ return ((__fls(mask) >> 3) << interleaved) + 1 + offset;
+}
+
+/* Returns 0 on success */
+static inline int omnia_cmd_read_bits(const struct i2c_client *client, u8 cmd,
+ unsigned long bits, unsigned long *dst)
+{
+ __le32 reply;
+ int err;
+
+ if (!bits) {
+ *dst = 0;
+ return 0;
+ }
+
+ err = omnia_cmd_read(client, cmd, &reply,
+ omnia_compute_reply_length(bits, false, 0));
+ if (err)
+ return err;
+
+ *dst = le32_to_cpu(reply) & bits;
+
+ return 0;
+}
+
+static inline int omnia_cmd_read_bit(const struct i2c_client *client, u8 cmd,
+ unsigned long bit)
+{
+ unsigned long reply;
+ int err;
+
+ err = omnia_cmd_read_bits(client, cmd, bit, &reply);
+ if (err)
+ return err;
+
+ return !!reply;
+}
+
+static inline int omnia_cmd_read_u32(const struct i2c_client *client, u8 cmd,
+ u32 *dst)
+{
+ __le32 reply;
+ int err;
+
+ err = omnia_cmd_read(client, cmd, &reply, sizeof(reply));
+ if (err)
+ return err;
+
+ *dst = le32_to_cpu(reply);
+
+ return 0;
+}
+
+static inline int omnia_cmd_read_u16(const struct i2c_client *client, u8 cmd,
+ u16 *dst)
+{
+ __le16 reply;
+ int err;
+
+ err = omnia_cmd_read(client, cmd, &reply, sizeof(reply));
+ if (err)
+ return err;
+
+ *dst = le16_to_cpu(reply);
+
+ return 0;
+}
+
+static inline int omnia_cmd_read_u8(const struct i2c_client *client, u8 cmd,
+ u8 *reply)
+{
+ return omnia_cmd_read(client, cmd, reply, sizeof(*reply));
+}
+
+extern const u8 omnia_int_to_gpio_idx[32];
+extern const struct attribute_group omnia_mcu_gpio_group;
+extern const struct attribute_group omnia_mcu_poweroff_group;
+
+int omnia_mcu_register_gpiochip(struct omnia_mcu *mcu);
+int omnia_mcu_register_sys_off_and_wakeup(struct omnia_mcu *mcu);
+int omnia_mcu_register_trng(struct omnia_mcu *mcu);
+int omnia_mcu_register_watchdog(struct omnia_mcu *mcu);
+
+#endif /* __TURRIS_OMNIA_MCU_H */
generated by cgit v1.2.3-58-ga151 (git 2.39.0) at 2024-11-21 19:37:58 +0000