diff options
Diffstat (limited to 'chip/npcx/cec.c')
| -rw-r--r-- | chip/npcx/cec.c | 125 |
1 files changed, 59 insertions, 66 deletions
diff --git a/chip/npcx/cec.c b/chip/npcx/cec.c index eb1cfefa0f..39f353b0e3 100644 --- a/chip/npcx/cec.c +++ b/chip/npcx/cec.c @@ -1,4 +1,4 @@ -/* Copyright 2018 The Chromium OS Authors. All rights reserved. +/* Copyright 2018 The ChromiumOS Authors * Use of this source code is governed by a BSD-style license that can be * found in the LICENSE file. */ @@ -22,21 +22,21 @@ #define CPRINTF(...) #define CPRINTS(...) #else -#define CPRINTF(format, args...) cprintf(CC_CEC, format, ## args) -#define CPRINTS(format, args...) cprints(CC_CEC, format, ## args) +#define CPRINTF(format, args...) cprintf(CC_CEC, format, ##args) +#define CPRINTS(format, args...) cprints(CC_CEC, format, ##args) #endif /* Time in us to timer clock ticks */ -#define APB1_TICKS(t) ((t) * apb1_freq_div_10k / 100) +#define APB1_TICKS(t) ((t)*apb1_freq_div_10k / 100) #if DEBUG_CEC /* Timer clock ticks to us */ -#define APB1_US(ticks) (100*(ticks)/apb1_freq_div_10k) +#define APB1_US(ticks) (100 * (ticks) / apb1_freq_div_10k) #endif /* Notification from interrupt to CEC task that data has been received */ #define TASK_EVENT_RECEIVED_DATA TASK_EVENT_CUSTOM_BIT(0) -#define TASK_EVENT_OKAY TASK_EVENT_CUSTOM_BIT(1) -#define TASK_EVENT_FAILED TASK_EVENT_CUSTOM_BIT(2) +#define TASK_EVENT_OKAY TASK_EVENT_CUSTOM_BIT(1) +#define TASK_EVENT_FAILED TASK_EVENT_CUSTOM_BIT(2) /* CEC broadcast address. Also the highest possible CEC address */ #define CEC_BROADCAST_ADDR 15 @@ -56,7 +56,7 @@ * free-time period less than in the spec. */ #define NOMINAL_BIT_TICKS APB1_TICKS(2400) - /* Resend */ +/* Resend */ #define FREE_TIME_RS_TICKS (2 * (NOMINAL_BIT_TICKS)) /* New initiator */ #define FREE_TIME_NI_TICKS (4 * (NOMINAL_BIT_TICKS)) @@ -64,33 +64,33 @@ #define FREE_TIME_PI_TICKS (6 * (NOMINAL_BIT_TICKS)) /* Start bit timing */ -#define START_BIT_LOW_TICKS APB1_TICKS(3700) -#define START_BIT_MIN_LOW_TICKS APB1_TICKS(3500) -#define START_BIT_MAX_LOW_TICKS APB1_TICKS(3900) -#define START_BIT_HIGH_TICKS APB1_TICKS(800) -#define START_BIT_MIN_DURATION_TICKS APB1_TICKS(4300) -#define START_BIT_MAX_DURATION_TICKS APB1_TICKS(5700) +#define START_BIT_LOW_TICKS APB1_TICKS(3700) +#define START_BIT_MIN_LOW_TICKS APB1_TICKS(3500) +#define START_BIT_MAX_LOW_TICKS APB1_TICKS(3900) +#define START_BIT_HIGH_TICKS APB1_TICKS(800) +#define START_BIT_MIN_DURATION_TICKS APB1_TICKS(4300) +#define START_BIT_MAX_DURATION_TICKS APB1_TICKS(5700) /* Data bit timing */ -#define DATA_ZERO_LOW_TICKS APB1_TICKS(1500) -#define DATA_ZERO_MIN_LOW_TICKS APB1_TICKS(1300) -#define DATA_ZERO_MAX_LOW_TICKS APB1_TICKS(1700) -#define DATA_ZERO_HIGH_TICKS APB1_TICKS(900) -#define DATA_ZERO_MIN_DURATION_TICKS APB1_TICKS(2050) -#define DATA_ZERO_MAX_DURATION_TICKS APB1_TICKS(2750) - -#define DATA_ONE_LOW_TICKS APB1_TICKS(600) -#define DATA_ONE_MIN_LOW_TICKS APB1_TICKS(400) -#define DATA_ONE_MAX_LOW_TICKS APB1_TICKS(800) -#define DATA_ONE_HIGH_TICKS APB1_TICKS(1800) -#define DATA_ONE_MIN_DURATION_TICKS APB1_TICKS(2050) -#define DATA_ONE_MAX_DURATION_TICKS APB1_TICKS(2750) +#define DATA_ZERO_LOW_TICKS APB1_TICKS(1500) +#define DATA_ZERO_MIN_LOW_TICKS APB1_TICKS(1300) +#define DATA_ZERO_MAX_LOW_TICKS APB1_TICKS(1700) +#define DATA_ZERO_HIGH_TICKS APB1_TICKS(900) +#define DATA_ZERO_MIN_DURATION_TICKS APB1_TICKS(2050) +#define DATA_ZERO_MAX_DURATION_TICKS APB1_TICKS(2750) + +#define DATA_ONE_LOW_TICKS APB1_TICKS(600) +#define DATA_ONE_MIN_LOW_TICKS APB1_TICKS(400) +#define DATA_ONE_MAX_LOW_TICKS APB1_TICKS(800) +#define DATA_ONE_HIGH_TICKS APB1_TICKS(1800) +#define DATA_ONE_MIN_DURATION_TICKS APB1_TICKS(2050) +#define DATA_ONE_MAX_DURATION_TICKS APB1_TICKS(2750) /* Time from low that it should be safe to sample an ACK */ #define NOMINAL_SAMPLE_TIME_TICKS APB1_TICKS(1050) -#define DATA_TIME(type, data) ((data) ? (DATA_ONE_ ## type ## _TICKS) : \ - (DATA_ZERO_ ## type ## _TICKS)) +#define DATA_TIME(type, data) \ + ((data) ? (DATA_ONE_##type##_TICKS) : (DATA_ZERO_##type##_TICKS)) #define DATA_HIGH(data) DATA_TIME(HIGH, data) #define DATA_LOW(data) DATA_TIME(LOW, data) @@ -119,26 +119,26 @@ * sure that if we get a timeout, something is wrong. */ #define CAP_START_LOW_TICKS (START_BIT_MAX_LOW_TICKS + VALID_TOLERANCE_TICKS) -#define CAP_START_HIGH_TICKS (START_BIT_MAX_DURATION_TICKS - \ - START_BIT_MIN_LOW_TICKS + \ - VALID_TOLERANCE_TICKS) +#define CAP_START_HIGH_TICKS \ + (START_BIT_MAX_DURATION_TICKS - START_BIT_MIN_LOW_TICKS + \ + VALID_TOLERANCE_TICKS) #define CAP_DATA_LOW_TICKS (DATA_ZERO_MAX_LOW_TICKS + VALID_TOLERANCE_TICKS) -#define CAP_DATA_HIGH_TICKS (DATA_ONE_MAX_DURATION_TICKS - \ - DATA_ONE_MIN_LOW_TICKS + \ - VALID_TOLERANCE_TICKS) +#define CAP_DATA_HIGH_TICKS \ + (DATA_ONE_MAX_DURATION_TICKS - DATA_ONE_MIN_LOW_TICKS + \ + VALID_TOLERANCE_TICKS) -#define VALID_TIME(type, bit, t) \ - ((t) >= ((bit ## _MIN_ ## type ## _TICKS) - (VALID_TOLERANCE_TICKS)) \ - && (t) <= (bit ##_MAX_ ## type ## _TICKS) + (VALID_TOLERANCE_TICKS)) +#define VALID_TIME(type, bit, t) \ + ((t) >= ((bit##_MIN_##type##_TICKS) - (VALID_TOLERANCE_TICKS)) && \ + (t) <= (bit##_MAX_##type##_TICKS) + (VALID_TOLERANCE_TICKS)) #define VALID_LOW(bit, t) VALID_TIME(LOW, bit, t) -#define VALID_HIGH(bit, low_time, high_time) \ - (((low_time) + (high_time) <= \ - bit ## _MAX_DURATION_TICKS + VALID_TOLERANCE_TICKS) && \ - ((low_time) + (high_time) >= \ - bit ## _MIN_DURATION_TICKS - VALID_TOLERANCE_TICKS)) -#define VALID_DATA_HIGH(data, low_time, high_time) ((data) ? \ - VALID_HIGH(DATA_ONE, low_time, high_time) : \ - VALID_HIGH(DATA_ZERO, low_time, high_time)) +#define VALID_HIGH(bit, low_time, high_time) \ + (((low_time) + (high_time) <= \ + bit##_MAX_DURATION_TICKS + VALID_TOLERANCE_TICKS) && \ + ((low_time) + (high_time) >= \ + bit##_MIN_DURATION_TICKS - VALID_TOLERANCE_TICKS)) +#define VALID_DATA_HIGH(data, low_time, high_time) \ + ((data) ? VALID_HIGH(DATA_ONE, low_time, high_time) : \ + VALID_HIGH(DATA_ZERO, low_time, high_time)) /* * CEC state machine states. Each state typically takes action on entry and @@ -179,10 +179,7 @@ enum cec_state { }; /* Edge to trigger capture timer interrupt on */ -enum cap_edge { - CAP_EDGE_FALLING, - CAP_EDGE_RISING -}; +enum cap_edge { CAP_EDGE_FALLING, CAP_EDGE_RISING }; /* Receive buffer and states */ struct cec_rx { @@ -408,13 +405,13 @@ void enter_state(enum cec_state new_state) break; case CEC_STATE_INITIATOR_EOM_LOW: gpio = 0; - timeout = DATA_LOW(cec_transfer_is_eom(&cec_tx.transfer, - cec_tx.len)); + timeout = DATA_LOW( + cec_transfer_is_eom(&cec_tx.transfer, cec_tx.len)); break; case CEC_STATE_INITIATOR_EOM_HIGH: gpio = 1; - timeout = DATA_HIGH(cec_transfer_is_eom(&cec_tx.transfer, - cec_tx.len)); + timeout = DATA_HIGH( + cec_transfer_is_eom(&cec_tx.transfer, cec_tx.len)); break; case CEC_STATE_INITIATOR_ACK_LOW: gpio = 0; @@ -423,8 +420,8 @@ void enter_state(enum cec_state new_state) case CEC_STATE_INITIATOR_ACK_HIGH: gpio = 1; /* Aim for the middle of the safe sample time */ - timeout = (DATA_ONE_LOW_TICKS + DATA_ZERO_LOW_TICKS)/2 - - DATA_ONE_LOW_TICKS; + timeout = (DATA_ONE_LOW_TICKS + DATA_ZERO_LOW_TICKS) / 2 - + DATA_ONE_LOW_TICKS; break; case CEC_STATE_INITIATOR_ACK_VERIFY: cec_tx.ack = !gpio_get_level(CEC_GPIO_OUT); @@ -523,7 +520,8 @@ void enter_state(enum cec_state new_state) cap_edge = CAP_EDGE_FALLING; timeout = CAP_DATA_HIGH_TICKS; break; - /* No default case, since all states must be handled explicitly */ + /* No default case, since all states must be handled explicitly + */ } if (gpio >= 0) @@ -594,8 +592,7 @@ static void cec_event_timeout(void) cec_tx.len = 0; cec_tx.resends = 0; enter_state(CEC_STATE_IDLE); - task_set_event(TASK_ID_CEC, - TASK_EVENT_OKAY); + task_set_event(TASK_ID_CEC, TASK_EVENT_OKAY); } } else { if (cec_tx.resends < CEC_MAX_RESENDS) { @@ -607,8 +604,7 @@ static void cec_event_timeout(void) cec_tx.len = 0; cec_tx.resends = 0; enter_state(CEC_STATE_IDLE); - task_set_event(TASK_ID_CEC, - TASK_EVENT_FAILED); + task_set_event(TASK_ID_CEC, TASK_EVENT_FAILED); } } break; @@ -645,7 +641,6 @@ static void cec_event_timeout(void) case CEC_STATE_FOLLOWER_DATA_HIGH: enter_state(CEC_STATE_IDLE); break; - } } @@ -672,7 +667,7 @@ static void cec_event_cap(void) break; case CEC_STATE_FOLLOWER_START_LOW: /* Rising edge of start bit, validate low time */ - t = tmr_cap_get(); + t = tmr_cap_get(); if (VALID_LOW(START_BIT, t)) { cec_rx.low_ticks = t; enter_state(CEC_STATE_FOLLOWER_START_HIGH); @@ -942,7 +937,6 @@ static enum ec_status hc_cec_set(struct host_cmd_handler_args *args) } DECLARE_HOST_COMMAND(EC_CMD_CEC_SET, hc_cec_set, EC_VER_MASK(0)); - static enum ec_status hc_cec_get(struct host_cmd_handler_args *args) { struct ec_response_cec_get *response = args->response; @@ -990,13 +984,12 @@ static int cec_get_next_msg(uint8_t *out) } DECLARE_EVENT_SOURCE(EC_MKBP_EVENT_CEC_MESSAGE, cec_get_next_msg); - static void cec_init(void) { int mdl = NPCX_MFT_MODULE_1; /* APB1 is the clock we base the timers on */ - apb1_freq_div_10k = clock_get_apb1_freq()/10000; + apb1_freq_div_10k = clock_get_apb1_freq() / 10000; /* Ensure Multi-Function timer is powered up. */ CLEAR_BIT(NPCX_PWDWN_CTL(mdl), NPCX_PWDWN_CTL1_MFT1_PD); |