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/* Copyright 2017 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 "console.h"
#include "gpio.h"
#include "hooks.h"
#include "registers.h"
#include "spi.h"
#include "system.h"
#include "timer.h"
#include "usb_spi.h"
#define CPRINTS(format, args...) cprints(CC_USB, format, ## args)
int usb_spi_board_enable(struct usb_spi_config const *config)
{
/* Connect DIO A4, A8, and A14 to the SPI peripheral */
GWRITE(PINMUX, DIOA4_SEL, 0); /* SPI_MOSI */
GWRITE(PINMUX, DIOA8_SEL, 0); /* SPI_CLK */
spi_enable(CONFIG_SPI_FLASH_PORT, 1);
/* Enable SPI framing for H1 bootloader */
gpio_set_level(GPIO_SPI_CS_ALT_L, 0);
return EC_SUCCESS;
}
void usb_spi_board_disable(struct usb_spi_config const *config)
{
/* End SPI framing for H1 bootloader */
gpio_set_level(GPIO_SPI_CS_ALT_L, 1);
spi_enable(CONFIG_SPI_FLASH_PORT, 0);
/* Disconnect SPI peripheral to tri-state pads */
ASSERT(GREAD(PINMUX, GPIO0_GPIO7_SEL) == GC_PINMUX_DIOA4_SEL);
ASSERT(GREAD(PINMUX, GPIO0_GPIO8_SEL) == GC_PINMUX_DIOA8_SEL);
/* Set SPI MOSI, CLK as inputs */
GWRITE(PINMUX, DIOA4_SEL, GC_PINMUX_GPIO0_GPIO7_SEL);
GWRITE(PINMUX, DIOA8_SEL, GC_PINMUX_GPIO0_GPIO8_SEL);
}
int usb_spi_interface(struct usb_spi_config const *config,
struct usb_setup_packet *req)
{
if (req->bmRequestType != (USB_DIR_OUT |
USB_TYPE_VENDOR |
USB_RECIP_INTERFACE))
return 1;
if (req->wValue != 0 ||
req->wIndex != config->interface ||
req->wLength != 0)
return 1;
if (!config->state->enabled_device)
return 1;
switch (req->bRequest) {
case USB_SPI_REQ_ENABLE_H1:
config->state->enabled_host = USB_SPI_H1;
break;
case USB_SPI_REQ_ENABLE_AP:
case USB_SPI_REQ_ENABLE:
CPRINTS("ERROR: Must specify target");
case USB_SPI_REQ_DISABLE:
config->state->enabled_host = USB_SPI_DISABLE;
break;
default:
return 1;
}
/*
* Our state has changed, call the deferred function to handle the
* state change.
*/
hook_call_deferred(config->deferred, 0);
return 0;
}
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