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/* Copyright (c) 2014 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 "ec_version.h"
#include "gpio.h"
#include "hooks.h"
#include "registers.h"
#include "task.h"
#include "trng.h"
#include "usb.h"
#include "usb_hid.h"
#include "util.h"
/*
* There's no way to trigger on both rising and falling edges, so force a
* compiler error if we try. The workaround is to use the pinmux to connect
* two GPIOs to the same input and configure each one for a separate edge.
*/
#undef GPIO_INT_BOTH
#define GPIO_INT_BOTH NOT_SUPPORTED_ON_CR50
#include "gpio_list.h"
#ifdef CONFIG_USB_HID
static void send_hid_event(void)
{
uint64_t rpt = 0;
uint8_t *key_ptr = (void *)&rpt + 2;
/* Convert SW_N/SW_S/SW_W/SW_E to A,B,C,D keys */
if (gpio_get_level(GPIO_SW_N))
*key_ptr++ = 0x04; /* A keycode */
if (gpio_get_level(GPIO_SW_S))
*key_ptr++ = 0x05; /* B keycode */
if (gpio_get_level(GPIO_SW_W))
*key_ptr++ = 0x06; /* C keycode */
if (gpio_get_level(GPIO_SW_E))
*key_ptr++ = 0x07; /* D keycode */
/* send the keyboard state over USB HID */
set_keyboard_report(rpt);
/* check release in the future */
hook_call_deferred(send_hid_event, 40);
}
DECLARE_DEFERRED(send_hid_event);
#endif
/* Interrupt handler for button pushes */
void button_event(enum gpio_signal signal)
{
int v;
/* We have two GPIOs on the same input (one rising edge, one falling
* edge), so de-alias them */
if (signal >= GPIO_SW_N_)
signal -= (GPIO_SW_N_ - GPIO_SW_N);
v = gpio_get_level(signal);
#ifdef CONFIG_USB_HID
send_hid_event();
#endif
ccprintf("Button %d = %d\n", signal, v);
gpio_set_level(signal - GPIO_SW_N + GPIO_LED_4, v);
}
static void init_interrutps(void)
{
int i;
static const enum gpio_signal gpio_signals[] = {
GPIO_SW_N, GPIO_SW_S, GPIO_SW_W, GPIO_SW_E,
GPIO_SW_N_, GPIO_SW_S_, GPIO_SW_W_, GPIO_SW_E_
};
for (i = 0; i < ARRAY_SIZE(gpio_signals); i++)
gpio_enable_interrupt(gpio_signals[i]);
}
enum permission_level {
PERMISSION_LOW = 0x00,
PERMISSION_MEDIUM = 0x33, /* APPS run at medium */
PERMISSION_HIGH = 0x3C,
PERMISSION_HIGHEST = 0x55
};
/* Drop run level to at least medium. */
static void init_runlevel(const enum permission_level desired_level)
{
volatile uint32_t *const reg_addrs[] = {
GREG32_ADDR(GLOBALSEC, CPU0_S_PERMISSION),
GREG32_ADDR(GLOBALSEC, CPU0_S_DAP_PERMISSION),
GREG32_ADDR(GLOBALSEC, DDMA0_PERMISSION),
};
int i;
/* Permission registers drop by 1 level (e.g. HIGHEST -> HIGH)
* each time a write is encountered (the value written does
* not matter). So we repeat writes and reads, until the
* desired level is reached.
*/
for (i = 0; i < ARRAY_SIZE(reg_addrs); i++) {
uint32_t current_level;
while (1) {
current_level = *reg_addrs[i];
if (current_level <= desired_level)
break;
*reg_addrs[i] = desired_level;
}
}
}
/* Initialize board. */
static void board_init(void)
{
init_interrutps();
init_trng();
init_runlevel(PERMISSION_MEDIUM);
}
DECLARE_HOOK(HOOK_INIT, board_init, HOOK_PRIO_DEFAULT);
#if defined(CONFIG_USB)
const void * const usb_strings[] = {
[USB_STR_DESC] = usb_string_desc,
[USB_STR_VENDOR] = USB_STRING_DESC("Google Inc."),
[USB_STR_PRODUCT] = USB_STRING_DESC("Cr50"),
[USB_STR_VERSION] = USB_STRING_DESC(CROS_EC_VERSION32),
[USB_STR_CONSOLE_NAME] = USB_STRING_DESC("Shell"),
[USB_STR_BLOB_NAME] = USB_STRING_DESC("Blob"),
[USB_STR_HID_NAME] = USB_STRING_DESC("PokeyPokey"),
};
BUILD_ASSERT(ARRAY_SIZE(usb_strings) == USB_STR_COUNT);
#endif
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