diff options
Diffstat (limited to 'board/servo_v4p1/usb_tc_snk_sm.c')
| -rw-r--r-- | board/servo_v4p1/usb_tc_snk_sm.c | 291 |
1 files changed, 0 insertions, 291 deletions
diff --git a/board/servo_v4p1/usb_tc_snk_sm.c b/board/servo_v4p1/usb_tc_snk_sm.c deleted file mode 100644 index f9a3966434..0000000000 --- a/board/servo_v4p1/usb_tc_snk_sm.c +++ /dev/null @@ -1,291 +0,0 @@ -/* Copyright 2020 The Chromium OS Authors. All rights reserved. - * Use of this source code is governed by a BSD-style license that can be - * found in the LICENSE file. - */ - -#include "common.h" -#include "console.h" -#include "fusb302b.h" -#include "ioexpanders.h" -#include "system.h" -#include "task.h" -#include "usb_common.h" -#include "usb_pd.h" -#include "usb_sm.h" -#include "usb_tc_sm.h" - -#define EVT_TIMEOUT_NEVER (-1) -#define EVT_TIMEOUT_5MS (5 * MSEC) - -/* - * USB Type-C Sink - * See Figure 4-13 in Release 1.4 of USB Type-C Spec. - */ -#define CPRINTF(format, args...) cprintf(CC_USBPD, format, ## args) -#define CPRINTS(format, args...) cprints(CC_USBPD, format, ## args) - -/* Type-C Layer Flags */ - -/* List of all TypeC-level states */ -enum usb_tc_state { - TC_UNATTACHED_SNK, - TC_ATTACH_WAIT_SNK, - TC_ATTACHED_SNK, -}; -/* Forward declare the full list of states. This is indexed by usb_tc_state */ -static const struct usb_state tc_states[]; - -/* TypeC Power strings */ -static const char * const pwr2_5_str = "5V/0.5A"; -static const char * const pwr7_5_str = "5V/1.5A"; -static const char * const pwr15_str = "5V/3A"; - -static struct type_c { - /* state machine context */ - struct sm_ctx ctx; - /* Port polarity */ - enum tcpc_cc_polarity polarity; - /* event timeout */ - uint64_t evt_timeout; - /* Time a port shall wait before it can determine it is attached */ - uint64_t cc_debounce; - /* - * Time a Sink port shall wait before it can determine it is detached - * due to the potential for USB PD signaling on CC as described in - * the state definitions. - */ - uint64_t pd_debounce; - /* The cc state */ - enum pd_cc_states cc_state; - /* Generic timer */ - uint64_t timeout; - /* Voltage on CC pin */ - enum tcpc_cc_voltage_status cc_voltage; - /* Current CC1 value */ - int cc1; - /* Current CC2 value */ - int cc2; -} tc; - -/* Forward declare common, private functions */ -static void set_state_tc(const enum usb_tc_state new_state); - -static void restart_tc_sm(enum usb_tc_state start_state) -{ - int res; - - res = init_fusb302b(1); - CPRINTS("FUSB302b init %s", res ? "failed" : "ready"); - - /* State machine is disabled if init_fusb302b fails */ - if (!res) - set_state_tc(start_state); - - /* Disable timeout. Task will wake on interrupt */ - tc.evt_timeout = EVT_TIMEOUT_NEVER; -} - -/* - * Private Functions - */ - -/* Set the TypeC state machine to a new state. */ -static void set_state_tc(const enum usb_tc_state new_state) -{ - set_state(0, &tc.ctx, &tc_states[new_state]); -} - -static void print_alt_power(void) -{ - enum tcpc_cc_voltage_status cc; - char const *pwr; - - cc = tc.polarity ? tc.cc2 : tc.cc1; - if (cc == TYPEC_CC_VOLT_OPEN || - cc == TYPEC_CC_VOLT_RA || cc == TYPEC_CC_VOLT_RD) { - /* Supply removed or not detected */ - return; - } - - if (cc == TYPEC_CC_VOLT_RP_1_5) - pwr = pwr7_5_str; - else if (cc == TYPEC_CC_VOLT_RP_3_0) - pwr = pwr15_str; - else - pwr = pwr2_5_str; - - CPRINTS("ALT: Switching to alternate supply @ %s", pwr); -} - -static void sink_power_sub_states(void) -{ - enum tcpc_cc_voltage_status cc; - enum tcpc_cc_voltage_status new_cc_voltage; - - cc = tc.polarity ? tc.cc2 : tc.cc1; - - if (cc == TYPEC_CC_VOLT_RP_DEF) - new_cc_voltage = TYPEC_CC_VOLT_RP_DEF; - else if (cc == TYPEC_CC_VOLT_RP_1_5) - new_cc_voltage = TYPEC_CC_VOLT_RP_1_5; - else if (cc == TYPEC_CC_VOLT_RP_3_0) - new_cc_voltage = TYPEC_CC_VOLT_RP_3_0; - else - new_cc_voltage = TYPEC_CC_VOLT_OPEN; - - /* Debounce the cc state */ - if (new_cc_voltage != tc.cc_voltage) { - tc.cc_voltage = new_cc_voltage; - tc.cc_debounce = get_time().val + PD_T_RP_VALUE_CHANGE; - return; - } - - if (tc.cc_debounce == 0 || get_time().val < tc.cc_debounce) - return; - - tc.cc_debounce = 0; - print_alt_power(); -} - -/* - * TYPE-C State Implementations - */ - -/** - * Unattached.SNK - */ -static void tc_unattached_snk_entry(int port) -{ - tc.evt_timeout = EVT_TIMEOUT_NEVER; -} - -static void tc_unattached_snk_run(int port) -{ - /* - * The port shall transition to AttachWait.SNK when a Source - * connection is detected, as indicated by the SNK.Rp state - * on at least one of its CC pins. - */ - if (cc_is_rp(tc.cc1) || cc_is_rp(tc.cc2)) - set_state_tc(TC_ATTACH_WAIT_SNK); -} - -/** - * AttachWait.SNK - */ -static void tc_attach_wait_snk_entry(int port) -{ - tc.evt_timeout = EVT_TIMEOUT_5MS; - tc.cc_state = PD_CC_UNSET; -} - -static void tc_attach_wait_snk_run(int port) -{ - enum pd_cc_states new_cc_state; - - if (cc_is_rp(tc.cc1) && cc_is_rp(tc.cc2)) - new_cc_state = PD_CC_DFP_DEBUG_ACC; - else if (cc_is_rp(tc.cc1) || cc_is_rp(tc.cc2)) - new_cc_state = PD_CC_DFP_ATTACHED; - else - new_cc_state = PD_CC_NONE; - - /* Debounce the cc state */ - if (new_cc_state != tc.cc_state) { - tc.cc_debounce = get_time().val + PD_T_CC_DEBOUNCE; - tc.pd_debounce = get_time().val + PD_T_PD_DEBOUNCE; - tc.cc_state = new_cc_state; - return; - } - - /* Wait for CC debounce */ - if (get_time().val < tc.cc_debounce) - return; - - /* - * The port shall transition to Attached.SNK after the state of only - * one of the CC1 or CC2 pins is SNK.Rp for at least tCCDebounce and - * VBUS is detected. - */ - if (is_vbus_present() && (new_cc_state == PD_CC_DFP_ATTACHED)) - set_state_tc(TC_ATTACHED_SNK); - else - set_state_tc(TC_UNATTACHED_SNK); -} - -/** - * Attached.SNK - */ -static void tc_attached_snk_entry(int port) -{ - print_alt_power(); - - tc.evt_timeout = EVT_TIMEOUT_NEVER; - tc.cc_debounce = 0; - - /* Switch over to alternate supply */ - en_pp5000_alt_3p3(1); -} - -static void tc_attached_snk_run(int port) -{ - /* Detach detection */ - if (!is_vbus_present()) { - set_state_tc(TC_UNATTACHED_SNK); - return; - } - - /* Run Sink Power Sub-State */ - sink_power_sub_states(); -} - -static void tc_attached_snk_exit(int port) -{ - /* Alternate charger removed. Switch back to host power */ - en_pp5000_alt_3p3(0); -} - -/* - * Type-C State - * - * TC_UNATTACHED_SNK - * TC_ATTACH_WAIT_SNK - * TC_TRY_WAIT_SNK - * TC_ATTACHED_SNK - */ -static const struct usb_state tc_states[] = { - [TC_UNATTACHED_SNK] = { - .entry = tc_unattached_snk_entry, - .run = tc_unattached_snk_run, - }, - [TC_ATTACH_WAIT_SNK] = { - .entry = tc_attach_wait_snk_entry, - .run = tc_attach_wait_snk_run, - }, - [TC_ATTACHED_SNK] = { - .entry = tc_attached_snk_entry, - .run = tc_attached_snk_run, - .exit = tc_attached_snk_exit, - }, -}; - -void snk_task(void *u) -{ - /* Unattached.SNK is the default starting state. */ - restart_tc_sm(TC_UNATTACHED_SNK); - - while (1) { - /* wait for next event or timeout expiration */ - task_wait_event(tc.evt_timeout); - - /* Sample CC lines */ - get_cc(&tc.cc1, &tc.cc2); - - /* Detect polarity */ - tc.polarity = (tc.cc1 > tc.cc2) ? POLARITY_CC1 : POLARITY_CC2; - - /* Run TypeC state machine */ - run_state(0, &tc.ctx); - } -} - |