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/* Copyright 2016 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 "clock.h"
#include "console.h"
#include "hooks.h"
#include "rdd.h"
#include "registers.h"
#include "system.h"
#include "task.h"
#include "timer.h"
#include "usb_api.h"
#define CPRINTS(format, args...) cprints(CC_USB, format, ## args)
/*
* The default PROG_DEBUG_STATE_MAP value. Used to tell the to controller send
* an interrupt when CC1/2 are detected to be in the defined voltage range of a
* debug accessory.
*/
#define DETECT_DEBUG 0x420
#define DETECT_DISCONNECT (~DETECT_DEBUG & 0xffff)
int debug_cable_is_attached(void)
{
uint8_t cc1 = GREAD_FIELD(RDD, INPUT_PIN_VALUES, CC1);
uint8_t cc2 = GREAD_FIELD(RDD, INPUT_PIN_VALUES, CC2);
return (cc1 == cc2 && (cc1 == 3 || cc1 == 1));
}
static void rdd_disconnected(void)
{
CPRINTS("Debug Accessory disconnected");
rdd_detached();
}
DECLARE_DEFERRED(rdd_disconnected);
void rdd_interrupt(void)
{
delay_sleep_by(1 * SECOND);
if (debug_cable_is_attached()) {
/* cancel pending rdd disconnect */
hook_call_deferred(&rdd_disconnected_data, -1);
CPRINTS("Debug Accessory connected");
/* Detect when debug cable is disconnected */
GWRITE(RDD, PROG_DEBUG_STATE_MAP, DETECT_DISCONNECT);
rdd_attached();
} else {
/* Detect when debug cable is connected */
GWRITE(RDD, PROG_DEBUG_STATE_MAP, DETECT_DEBUG);
/*
* Debounce the RDD disconnect for 2 seconds so rdd events
* won't be triggered by any PD negotiation the EC does during
* reset or sysjump.
*/
hook_call_deferred(&rdd_disconnected_data, 2 * SECOND);
}
/* Clear interrupt */
GWRITE_FIELD(RDD, INT_STATE, INTR_DEBUG_STATE_DETECTED, 1);
}
DECLARE_IRQ(GC_IRQNUM_RDD0_INTR_DEBUG_STATE_DETECTED_INT, rdd_interrupt, 1);
void rdd_init(void)
{
/* Enable RDD */
clock_enable_module(MODULE_RDD, 1);
GWRITE(RDD, POWER_DOWN_B, 1);
GWRITE(RDD, PROG_DEBUG_STATE_MAP, DETECT_DEBUG);
/* Initialize the debug state based on the current cc values */
rdd_interrupt();
/* Enable RDD interrupts */
task_enable_irq(GC_IRQNUM_RDD0_INTR_DEBUG_STATE_DETECTED_INT);
GWRITE_FIELD(RDD, INT_ENABLE, INTR_DEBUG_STATE_DETECTED, 1);
}
DECLARE_HOOK(HOOK_INIT, rdd_init, HOOK_PRIO_DEFAULT);
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