diff options
Diffstat (limited to 'zephyr/program/nissa/nereid/src/usbc.c')
-rw-r--r-- | zephyr/program/nissa/nereid/src/usbc.c | 369 |
1 files changed, 369 insertions, 0 deletions
diff --git a/zephyr/program/nissa/nereid/src/usbc.c b/zephyr/program/nissa/nereid/src/usbc.c new file mode 100644 index 0000000000..1e87abfa0d --- /dev/null +++ b/zephyr/program/nissa/nereid/src/usbc.c @@ -0,0 +1,369 @@ +/* Copyright 2022 The ChromiumOS Authors + * Use of this source code is governed by a BSD-style license that can be + * found in the LICENSE file. + */ + +#include "charge_state_v2.h" +#include "chipset.h" +#include "driver/charger/sm5803.h" +#include "driver/tcpm/it83xx_pd.h" +#include "driver/tcpm/ps8xxx_public.h" +#include "driver/tcpm/tcpci.h" +#include "hooks.h" +#include "nissa_common.h" +#include "system.h" +#include "usb_mux.h" + +#include <zephyr/logging/log.h> + +#include <ap_power/ap_power.h> + +LOG_MODULE_DECLARE(nissa, CONFIG_NISSA_LOG_LEVEL); + +/* Vconn control for integrated ITE TCPC */ +void board_pd_vconn_ctrl(int port, enum usbpd_cc_pin cc_pin, int enabled) +{ + /* Vconn control is only for port 0 */ + if (port) + return; + + if (cc_pin == USBPD_CC_PIN_1) + gpio_pin_set_dt( + GPIO_DT_FROM_NODELABEL(gpio_en_usb_c0_cc1_vconn), + !!enabled); + else + gpio_pin_set_dt( + GPIO_DT_FROM_NODELABEL(gpio_en_usb_c0_cc2_vconn), + !!enabled); +} + +__override bool pd_check_vbus_level(int port, enum vbus_level level) +{ + return sm5803_check_vbus_level(port, level); +} + +/* + * Putting chargers into LPM when in suspend reduces power draw by about 8mW + * per charger, but also seems critical to correct operation in source mode: + * if chargers are not in LPM when a sink is first connected, VBUS sourcing + * works even if the partner is later removed (causing LPM entry) and + * reconnected (causing LPM exit). If in LPM initially, sourcing VBUS + * consistently causes the charger to report (apparently spurious) overcurrent + * failures. + * + * In short, this is important to making things work correctly but we don't + * understand why. + */ +static void board_chargers_suspend(struct ap_power_ev_callback *const cb, + const struct ap_power_ev_data data) +{ + void (*fn)(int chgnum); + + switch (data.event) { + case AP_POWER_SUSPEND: + fn = sm5803_enable_low_power_mode; + break; + case AP_POWER_RESUME: + fn = sm5803_disable_low_power_mode; + break; + default: + LOG_WRN("%s: power event %d is not recognized", __func__, + data.event); + return; + } + + fn(CHARGER_PRIMARY); + if (board_get_charger_chip_count() > 1) + fn(CHARGER_SECONDARY); +} + +static int board_chargers_suspend_init(const struct device *unused) +{ + static struct ap_power_ev_callback cb = { + .handler = board_chargers_suspend, + .events = AP_POWER_SUSPEND | AP_POWER_RESUME, + }; + ap_power_ev_add_callback(&cb); + return 0; +} +SYS_INIT(board_chargers_suspend_init, APPLICATION, 0); + +int board_set_active_charge_port(int port) +{ + int is_real_port = (port >= 0 && port < board_get_usb_pd_port_count()); + int i; + int old_port; + int rv; + + if (!is_real_port && port != CHARGE_PORT_NONE) + return EC_ERROR_INVAL; + + old_port = charge_manager_get_active_charge_port(); + LOG_INF("Charge update: p%d -> p%d", old_port, port); + + /* Check if port is sourcing VBUS. */ + if (port != CHARGE_PORT_NONE && charger_is_sourcing_otg_power(port)) { + LOG_WRN("Skip enable p%d: already sourcing", port); + return EC_ERROR_INVAL; + } + + /* Disable sinking on all ports except the desired one */ + for (i = 0; i < board_get_usb_pd_port_count(); i++) { + if (i == port) + continue; + + if (sm5803_vbus_sink_enable(i, 0)) + /* + * Do not early-return because this can fail during + * power-on which would put us into a loop. + */ + LOG_WRN("p%d: sink path disable failed.", i); + } + + /* Don't enable anything (stop here) if no ports were requested */ + if ((port == CHARGE_PORT_NONE) || (old_port == port)) + return EC_SUCCESS; + + /* + * Stop the charger IC from switching while changing ports. Otherwise, + * we can overcurrent the adapter we're switching to. (crbug.com/926056) + */ + if (old_port != CHARGE_PORT_NONE) + charger_discharge_on_ac(1); + + /* Enable requested charge port. */ + rv = sm5803_vbus_sink_enable(port, 1); + if (rv) + LOG_WRN("p%d: sink path enable failed: code %d", port, rv); + + /* Allow the charger IC to begin/continue switching. */ + charger_discharge_on_ac(0); + + return rv; +} + +uint16_t tcpc_get_alert_status(void) +{ + /* + * TCPC 0 is embedded in the EC and processes interrupts in the chip + * code (it83xx/intc.c). This function only needs to poll port C1 if + * present. + */ + uint16_t status = 0; + int regval; + + /* Is the C1 port present and its IRQ line asserted? */ + if (board_get_usb_pd_port_count() == 2 && + !gpio_pin_get_dt(GPIO_DT_FROM_ALIAS(gpio_usb_c1_int_odl))) { + /* + * C1 IRQ is shared between BC1.2 and TCPC; poll TCPC to see if + * it asserted the IRQ. + */ + if (!tcpc_read16(1, TCPC_REG_ALERT, ®val)) { + if (regval) + status = PD_STATUS_TCPC_ALERT_1; + } + } + + return status; +} + +void pd_power_supply_reset(int port) +{ + int prev_en; + + if (port < 0 || port >= board_get_usb_pd_port_count()) + return; + + prev_en = charger_is_sourcing_otg_power(port); + + /* Disable Vbus */ + charger_enable_otg_power(port, 0); + + /* Discharge Vbus if previously enabled */ + if (prev_en) + sm5803_set_vbus_disch(port, 1); + + /* Notify host of power info change. */ + pd_send_host_event(PD_EVENT_POWER_CHANGE); +} + +int pd_set_power_supply_ready(int port) +{ + enum ec_error_list rv; + + if (port < 0 || port > board_get_usb_pd_port_count()) { + LOG_WRN("Port C%d does not exist, cannot enable VBUS", port); + return EC_ERROR_INVAL; + } + + /* Disable sinking */ + rv = sm5803_vbus_sink_enable(port, 0); + if (rv) { + LOG_WRN("C%d failed to disable sinking: %d", port, rv); + return rv; + } + + /* Disable Vbus discharge */ + rv = sm5803_set_vbus_disch(port, 0); + if (rv) { + LOG_WRN("C%d failed to clear VBUS discharge: %d", port, rv); + return rv; + } + + /* Provide Vbus */ + rv = charger_enable_otg_power(port, 1); + if (rv) { + LOG_WRN("C%d failed to enable VBUS sourcing: %d", port, rv); + return rv; + } + + /* Notify host of power info change. */ + pd_send_host_event(PD_EVENT_POWER_CHANGE); + + return EC_SUCCESS; +} + +__override void typec_set_source_current_limit(int port, enum tcpc_rp_value rp) +{ + int rv; + const int current = rp == TYPEC_RP_3A0 ? 3000 : 1500; + + rv = charger_set_otg_current_voltage(port, current, 5000); + if (rv != EC_SUCCESS) { + LOG_WRN("Failed to set source ilimit on port %d to %d: %d", + port, current, rv); + } +} + +void board_reset_pd_mcu(void) +{ + /* + * Do nothing. The integrated TCPC for C0 lacks a dedicated reset + * command, and C1 (if present) doesn't have a reset pin connected + * to the EC. + */ +} + +#define INT_RECHECK_US 5000 + +/* C0 interrupt line shared by BC 1.2 and charger */ + +static void check_c0_line(void); +DECLARE_DEFERRED(check_c0_line); + +static void notify_c0_chips(void) +{ + usb_charger_task_set_event(0, USB_CHG_EVENT_BC12); + sm5803_interrupt(0); +} + +static void check_c0_line(void) +{ + /* + * If line is still being held low, see if there's more to process from + * one of the chips + */ + if (!gpio_pin_get_dt(GPIO_DT_FROM_NODELABEL(gpio_usb_c0_int_odl))) { + notify_c0_chips(); + hook_call_deferred(&check_c0_line_data, INT_RECHECK_US); + } +} + +void usb_c0_interrupt(enum gpio_signal s) +{ + /* Cancel any previous calls to check the interrupt line */ + hook_call_deferred(&check_c0_line_data, -1); + + /* Notify all chips using this line that an interrupt came in */ + notify_c0_chips(); + + /* Check the line again in 5ms */ + hook_call_deferred(&check_c0_line_data, INT_RECHECK_US); +} + +/* C1 interrupt line shared by BC 1.2, TCPC, and charger */ +static void check_c1_line(void); +DECLARE_DEFERRED(check_c1_line); + +static void notify_c1_chips(void) +{ + schedule_deferred_pd_interrupt(1); + usb_charger_task_set_event(1, USB_CHG_EVENT_BC12); + /* Charger is handled in board_process_pd_alert */ +} + +static void check_c1_line(void) +{ + /* + * If line is still being held low, see if there's more to process from + * one of the chips. + */ + if (!gpio_pin_get_dt(GPIO_DT_FROM_ALIAS(gpio_usb_c1_int_odl))) { + notify_c1_chips(); + hook_call_deferred(&check_c1_line_data, INT_RECHECK_US); + } +} + +void usb_c1_interrupt(enum gpio_signal s) +{ + /* Cancel any previous calls to check the interrupt line */ + hook_call_deferred(&check_c1_line_data, -1); + + /* Notify all chips using this line that an interrupt came in */ + notify_c1_chips(); + + /* Check the line again in 5ms */ + hook_call_deferred(&check_c1_line_data, INT_RECHECK_US); +} + +/* + * Check state of IRQ lines at startup, ensuring an IRQ that happened before + * the EC started up won't get lost (leaving the IRQ line asserted and blocking + * any further interrupts on the port). + * + * Although the PD task will check for pending TCPC interrupts on startup, + * the charger sharing the IRQ will not be polled automatically. + */ +void board_handle_initial_typec_irq(void) +{ + check_c0_line(); + if (board_get_usb_pd_port_count() == 2) + check_c1_line(); +} +/* + * This must run after sub-board detection (which happens in EC main()), + * but isn't depended on by anything else either. + */ +DECLARE_HOOK(HOOK_INIT, board_handle_initial_typec_irq, HOOK_PRIO_LAST); + +/* + * Handle charger interrupts in the PD task. Not doing so can lead to a priority + * inversion where we fail to respond to TCPC alerts quickly enough because we + * don't get another edge on a shared IRQ until the charger interrupt is cleared + * (or the IRQ is polled again), which happens in the low-priority charger task: + * the high-priority type-C handler is thus blocked on the lower-priority + * charger. + * + * To avoid that, we run charger interrupts at the same priority. + */ +void board_process_pd_alert(int port) +{ + /* + * Port 0 doesn't use an external TCPC, so its interrupts don't need + * this special handling. + */ + if (port == 1 && + !gpio_pin_get_dt(GPIO_DT_FROM_ALIAS(gpio_usb_c1_int_odl))) { + sm5803_handle_interrupt(port); + } +} + +int pd_snk_is_vbus_provided(int port) +{ + int chg_det = 0; + + sm5803_get_chg_det(port, &chg_det); + + return chg_det; +} |