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/* Copyright (c) 2012 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 "gpio.h"
#include "jtag.h"
#include "registers.h"
#include "system.h"
void jtag_pre_init(void)
{
/* Enable clocks to GPIO block C in run and sleep modes. */
clock_enable_peripheral(CGC_OFFSET_GPIO, 0x0004, CGC_MODE_ALL);
/*
* Ensure PC0:3 are set to JTAG function. They should be set this way
* on a cold boot, but on a warm reboot a previous misbehaving image
* could have set them differently.
*/
if (((LM4_GPIO_PCTL(LM4_GPIO_C) & 0x0000ffff) == 0x00001111) &&
((LM4_GPIO_AFSEL(LM4_GPIO_C) & 0x0f) == 0x0f) &&
((LM4_GPIO_DEN(LM4_GPIO_C) & 0x0f) == 0x0f) &&
((LM4_GPIO_PUR(LM4_GPIO_C) & 0x0f) == 0x0f))
return; /* Already properly configured */
/* Unlock commit register for JTAG pins */
LM4_GPIO_LOCK(LM4_GPIO_C) = LM4_GPIO_LOCK_UNLOCK;
LM4_GPIO_CR(LM4_GPIO_C) |= 0x0f;
/* Reset JTAG pins */
LM4_GPIO_PCTL(LM4_GPIO_C) =
(LM4_GPIO_PCTL(LM4_GPIO_C) & 0xffff0000) | 0x00001111;
LM4_GPIO_AFSEL(LM4_GPIO_C) |= 0x0f;
LM4_GPIO_DEN(LM4_GPIO_C) |= 0x0f;
LM4_GPIO_PUR(LM4_GPIO_C) |= 0x0f;
/* Set interrupt on either edge of the JTAG signals */
LM4_GPIO_IS(LM4_GPIO_C) &= ~0x0f;
LM4_GPIO_IBE(LM4_GPIO_C) |= 0x0f;
/* Re-lock commit register */
LM4_GPIO_CR(LM4_GPIO_C) &= ~0x0f;
LM4_GPIO_LOCK(LM4_GPIO_C) = 0;
}
#ifdef CONFIG_LOW_POWER_IDLE
void jtag_interrupt(enum gpio_signal signal)
{
/*
* This interrupt is the first sign someone is trying to use
* the JTAG. Disable slow speed sleep so that the JTAG action
* can take place.
*/
disable_sleep(SLEEP_MASK_JTAG);
/*
* Once we get this interrupt, disable it from occurring again
* to avoid repeated interrupts when debugging via JTAG.
*/
gpio_disable_interrupt(GPIO_JTAG_TCK);
}
#endif /* CONFIG_LOW_POWER_IDLE */
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