bh_chip.h

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/*
 * Copyright (c) 2024 Tenstorrent AI ULC
 *
 * SPDX-License-Identifier: Apache-2.0
 */
 
#ifndef INCLUDE_TENSTORRENT_LIB_BH_CHIP_H_
#define INCLUDE_TENSTORRENT_LIB_BH_CHIP_H_
 
#include "bh_arc.h"
 
#include <zephyr/kernel.h>
#include <zephyr/device.h>
#include <zephyr/drivers/gpio.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
struct bh_straps {
        struct gpio_dt_spec gpio6;
        struct gpio_dt_spec gpio38;
        struct gpio_dt_spec gpio39;
        struct gpio_dt_spec gpio40;
};
 
struct bh_chip_config {
        struct gpio_dt_spec asic_reset;
        struct gpio_dt_spec spi_reset;
        struct gpio_dt_spec spi_mux;
        struct gpio_dt_spec pgood;
        struct gpio_dt_spec therm_trip;
        const struct device *flash;
        const struct device *jtag;
 
        const struct bh_straps strapping;
 
        struct bh_arc arc;
};
 
struct bh_chip_data {
        /* Flag set when bootrom has been loaded and the arc_soft_reset sequence can be appled. */
        bool workaround_applied;
 
        /*
         * Flag set when need to send or receive 1 time info to chip.
         * Could be used for static data or config of peripherals.
         */
        bool arc_needs_init_msg;
 
        unsigned int bus_cancel_flag;
 
        /*
         * notify the main thread to apply reset sequence
         * also used during initial workaround application to invoke a reset as soon
         * as the workaround has been applied
         */
        atomic_t trigger_reset;
        volatile bool performing_reset;
 
        /* notify the main thread to handle therm trip */
        volatile bool therm_trip_triggered;
        uint16_t therm_trip_count;
 
        /* notify the main thread to handle pgood events */
        volatile bool pgood_fall_triggered;
        volatile bool pgood_rise_triggered;
        bool pgood_severe_fault;
        int64_t pgood_last_trip_ms;
 
        /* Max allowable time between pings from SMC in ms */
        uint32_t auto_reset_timeout;
 
        /* Keep track of telemetry heartbeat for autoreset */
        uint32_t telemetry_heartbeat;
 
        /* Tracks program counter during last ARC hang */
        uint32_t arc_hang_pc;
        /* Was ARC watchdog triggered? */
        bool arc_wdog_triggered;
 
        /* Requested fan speed in %. */
        uint8_t fan_speed;
        /* Is that a forced or automatic fan speed? */
        bool fan_speed_forced;
 
        /* Last seen CM2DM message sequence number, to know if the current message is a repeat. */
        uint8_t last_cm2dm_seq_num;
        bool last_cm2dm_seq_num_valid;
 
        /* Cable power limit detected at boot, written to scratch register during resets. */
        uint16_t cable_power_limit;
 
        /*
         * Per-chip DMC init timing
         * perst_seen flags whether dm_init_done should be tracked.
         * dm_init_done is in DMC clock cycles
         * arc_start_time is ASIC refclk counter read over JTAG (see jtag_bootrom_soft_reset_arc).
         */
        bool perst_seen;
        uint32_t dm_init_done;
        uint32_t arc_start_time;
};
 
struct bh_chip {
        const struct bh_chip_config config;
        struct bh_chip_data data;
        struct gpio_callback therm_trip_cb;
        struct gpio_callback pgood_cb;
        struct k_timer auto_reset_timer;
};
 
#define DT_PHANDLE_OR_CHILD(node_id, name)                                                         \
        COND_CODE_1(DT_NODE_HAS_PROP(node_id, name), (DT_PHANDLE(node_id, name)),                 \
              (DT_CHILD(node_id, name)))
 
#define HAS_DT_PHANDLE_OR_CHILD(node_id, name) DT_NODE_EXISTS(DT_PHANDLE_OR_CHILD(node_id, name))
#define BH_CHIP_COUNT                          DT_PROP_LEN_OR(DT_PATH(chips), chips, 0)
extern struct bh_chip BH_CHIPS[BH_CHIP_COUNT];
 
#if BH_CHIP_COUNT > 0
#define ARRAY_FOR_EACH_BH_CHIP(chip) ARRAY_FOR_EACH_PTR(BH_CHIPS, chip)
#else
#define ARRAY_FOR_EACH_BH_CHIP(chip)                                                               \
        for (struct bh_chip * (chip) = NULL; (chip) != NULL; (chip) = NULL)
#endif
 
#define MAKE_STRUCT_FIELD(n) .n
 
#define INIT_STRAP(n) MAKE_STRUCT_FIELD(DT_NODE_FULL_NAME_TOKEN(n)) = GPIO_DT_SPEC_GET(n, gpios),
 
#define INIT_CHIP(n, prop, idx)                                                                    \
        {                                                                                          \
                .config = {                                                                        \
                        .asic_reset = GPIO_DT_SPEC_GET(                                            \
                                DT_PHANDLE_OR_CHILD(DT_PHANDLE_BY_IDX(n, prop, idx), asic_reset),  \
                                gpios),                                                            \
                        .spi_reset = GPIO_DT_SPEC_GET(                                             \
                                DT_PHANDLE_OR_CHILD(DT_PHANDLE_BY_IDX(n, prop, idx), spi_reset),   \
                                gpios),                                                            \
                        .flash = DEVICE_DT_GET_OR_NULL(                                            \
                                DT_PHANDLE_OR_CHILD(DT_PHANDLE_BY_IDX(n, prop, idx), flash)),      \
                        .jtag = DEVICE_DT_GET(                                                     \
                                DT_PHANDLE_OR_CHILD(DT_PHANDLE_BY_IDX(n, prop, idx), jtag)),       \
                        .arc = BH_ARC_INIT(                                                        \
                                DT_PHANDLE_OR_CHILD(DT_PHANDLE_BY_IDX(n, prop, idx), arc)),        \
                        .spi_mux = GPIO_DT_SPEC_GET(                                               \
                                DT_PHANDLE_OR_CHILD(DT_PHANDLE_BY_IDX(n, prop, idx), spi_mux),     \
                                gpios),                                                            \
                        .pgood = GPIO_DT_SPEC_GET(                                                 \
                                DT_PHANDLE_OR_CHILD(DT_PHANDLE_BY_IDX(n, prop, idx), pgood),       \
                                gpios),                                                            \
                        .therm_trip = GPIO_DT_SPEC_GET(                                            \
                                DT_PHANDLE_OR_CHILD(DT_PHANDLE_BY_IDX(n, prop, idx), therm_trip),  \
                                gpios),                                                            \
                        .strapping = {COND_CODE_1(                                                 \
          HAS_DT_PHANDLE_OR_CHILD(DT_PHANDLE_BY_IDX(n, prop, idx), strapping),                     \
          (DT_FOREACH_CHILD(DT_PHANDLE_OR_CHILD(DT_PHANDLE_BY_IDX(n, prop, idx), strapping),       \
                            INIT_STRAP)),                                                          \
          ())},                                            \
                        },                                                                         \
                                                  .auto_reset_timer = Z_TIMER_INITIALIZER(         \
                                                          BH_CHIPS[idx].auto_reset_timer,          \
                                                          bh_chip_auto_reset, NULL),               \
                        },
 
#define BH_CHIP_PRIMARY_INDEX DT_PROP(DT_PATH(chips), primary)
 
int jtag_bootrom_reset_sequence(struct bh_chip *chip, bool force_reset, uint16_t cable_power_limit);
 
void bh_chip_cancel_bus_transfer_set(struct bh_chip *chip);
void bh_chip_cancel_bus_transfer_clear(struct bh_chip *chip);
 
cm2dmMessageRet bh_chip_get_cm2dm_message(struct bh_chip *chip);
int bh_chip_set_static_info(struct bh_chip *chip, dmStaticInfo *info);
int bh_chip_set_input_power(struct bh_chip *chip, uint16_t power);
int bh_chip_set_input_power_lim(struct bh_chip *chip, uint16_t max_power);
int bh_chip_set_fan_rpm(struct bh_chip *chip, uint16_t rpm);
int bh_chip_set_therm_trip_count(struct bh_chip *chip, uint16_t therm_trip_count);
int bh_chip_write_logs(struct bh_chip *chip, char *log_data, size_t log_size);
 
void bh_chip_auto_reset(struct k_timer *timer);
 
void bh_chip_assert_asic_reset(const struct bh_chip *chip);
void bh_chip_deassert_asic_reset(const struct bh_chip *chip);
 
void bh_chip_set_straps(struct bh_chip *chip);
void bh_chip_unset_straps(struct bh_chip *chip);
 
void bh_chip_assert_spi_reset(const struct bh_chip *chip);
void bh_chip_deassert_spi_reset(const struct bh_chip *chip);
 
int bh_chip_reset_chip(struct bh_chip *chip, bool force_reset);
 
int therm_trip_gpio_setup(struct bh_chip *chip);
int pgood_gpio_setup(struct bh_chip *chip);
 
void handle_pgood_event(struct bh_chip *chip, struct gpio_dt_spec board_fault_led);
 
#ifdef __cplusplus
}
#endif
 
#endif /* INCLUDE_TENSTORRENT_LIB_BH_CHIP_H_ */