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/* Copyright 2016 The ChromiumOS Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/* Servo micro board configuration */
#include "common.h"
#include "console.h"
#include "ec_version.h"
#include "gpio.h"
#include "hooks.h"
#include "i2c.h"
#include "i2c_ite_flash_support.h"
#include "queue_policies.h"
#include "registers.h"
#include "spi.h"
#include "system.h"
#include "task.h"
#include "timer.h"
#include "update_fw.h"
#include "usart-stm32f0.h"
#include "usart_tx_dma.h"
#include "usart_rx_dma.h"
#include "usb_hw.h"
#include "usb_i2c.h"
#include "usb_spi.h"
#include "usb-stream.h"
#include "util.h"
#include "gpio_list.h"
void board_config_pre_init(void)
{
/* enable SYSCFG clock */
STM32_RCC_APB2ENR |= STM32_RCC_SYSCFGEN;
/*
* the DMA mapping is :
* Chan 3 : USART3_RX
* Chan 5 : USART2_RX
* Chan 6 : USART4_RX (Disable)
* Chan 6 : SPI2_RX
* Chan 7 : SPI2_TX
*
* i2c : no dma
* tim16/17: no dma
*/
STM32_SYSCFG_CFGR1 |= BIT(26); /* Remap USART3 RX/TX DMA */
/* Remap SPI2 to DMA channels 6 and 7 */
/* STM32F072 SPI2 defaults to using DMA channels 4 and 5 */
/* but cros_ec hardcodes a 6/7 assumption in registers.h */
STM32_SYSCFG_CFGR1 |= BIT(24);
}
/******************************************************************************
* Forward UARTs as a USB serial interface.
*/
#define USB_STREAM_RX_SIZE 32
#define USB_STREAM_TX_SIZE 64
/******************************************************************************
* Forward USART2 (EC) as a simple USB serial interface.
*/
static struct usart_config const usart2;
struct usb_stream_config const usart2_usb;
static struct queue const usart2_to_usb =
QUEUE_DIRECT(1024, uint8_t, usart2.producer, usart2_usb.consumer);
static struct queue const usb_to_usart2 =
QUEUE_DIRECT(64, uint8_t, usart2_usb.producer, usart2.consumer);
static struct usart_rx_dma const usart2_rx_dma =
USART_RX_DMA(STM32_DMAC_CH5, 32);
static struct usart_config const usart2 =
USART_CONFIG(usart2_hw, usart2_rx_dma.usart_rx, usart_tx_interrupt,
115200, 0, usart2_to_usb, usb_to_usart2);
USB_STREAM_CONFIG_USART_IFACE(usart2_usb, USB_IFACE_USART2_STREAM,
USB_STR_USART2_STREAM_NAME, USB_EP_USART2_STREAM,
USB_STREAM_RX_SIZE, USB_STREAM_TX_SIZE,
usb_to_usart2, usart2_to_usb, usart2)
/******************************************************************************
* Forward USART3 (CPU) as a simple USB serial interface.
*/
static struct usart_config const usart3;
struct usb_stream_config const usart3_usb;
static struct queue const usart3_to_usb =
QUEUE_DIRECT(1024, uint8_t, usart3.producer, usart3_usb.consumer);
static struct queue const usb_to_usart3 =
QUEUE_DIRECT(64, uint8_t, usart3_usb.producer, usart3.consumer);
static struct usart_rx_dma const usart3_rx_dma =
USART_RX_DMA(STM32_DMAC_CH3, 32);
static struct usart_config const usart3 =
USART_CONFIG(usart3_hw, usart3_rx_dma.usart_rx, usart_tx_interrupt,
115200, 0, usart3_to_usb, usb_to_usart3);
USB_STREAM_CONFIG_USART_IFACE(usart3_usb, USB_IFACE_USART3_STREAM,
USB_STR_USART3_STREAM_NAME, USB_EP_USART3_STREAM,
USB_STREAM_RX_SIZE, USB_STREAM_TX_SIZE,
usb_to_usart3, usart3_to_usb, usart3)
/******************************************************************************
* Forward USART4 (cr50) as a simple USB serial interface.
* We cannot enable DMA due to lack of DMA channels.
*/
static struct usart_config const usart4;
struct usb_stream_config const usart4_usb;
static struct queue const usart4_to_usb =
QUEUE_DIRECT(1024, uint8_t, usart4.producer, usart4_usb.consumer);
static struct queue const usb_to_usart4 =
QUEUE_DIRECT(64, uint8_t, usart4_usb.producer, usart4.consumer);
static struct usart_config const usart4 =
USART_CONFIG(usart4_hw, usart_rx_interrupt, usart_tx_interrupt, 115200,
0, usart4_to_usb, usb_to_usart4);
USB_STREAM_CONFIG_USART_IFACE(usart4_usb, USB_IFACE_USART4_STREAM,
USB_STR_USART4_STREAM_NAME, USB_EP_USART4_STREAM,
USB_STREAM_RX_SIZE, USB_STREAM_TX_SIZE,
usb_to_usart4, usart4_to_usb, usart4)
/******************************************************************************
* Check parity setting on usarts.
*/
static int command_uart_parity(int argc, const char **argv)
{
int parity = 0, newparity;
struct usart_config const *usart;
char *e;
if ((argc < 2) || (argc > 3))
return EC_ERROR_PARAM_COUNT;
if (!strcasecmp(argv[1], "usart2"))
usart = &usart2;
else if (!strcasecmp(argv[1], "usart3"))
usart = &usart3;
else if (!strcasecmp(argv[1], "usart4"))
usart = &usart4;
else
return EC_ERROR_PARAM1;
if (argc == 3) {
parity = strtoi(argv[2], &e, 0);
if (*e || (parity < 0) || (parity > 2))
return EC_ERROR_PARAM2;
usart_set_parity(usart, parity);
}
newparity = usart_get_parity(usart);
ccprintf("Parity on %s is %d.\n", argv[1], newparity);
if ((argc == 3) && (newparity != parity))
return EC_ERROR_UNKNOWN;
return EC_SUCCESS;
}
DECLARE_CONSOLE_COMMAND(parity, command_uart_parity, "usart[2|3|4] [0|1|2]",
"Set parity on uart");
/******************************************************************************
* Set baud rate setting on usarts.
*/
static int command_uart_baud(int argc, const char **argv)
{
int baud = 0;
struct usart_config const *usart;
char *e;
if ((argc < 2) || (argc > 3))
return EC_ERROR_PARAM_COUNT;
if (!strcasecmp(argv[1], "usart2"))
usart = &usart2;
else if (!strcasecmp(argv[1], "usart3"))
usart = &usart3;
else if (!strcasecmp(argv[1], "usart4"))
usart = &usart4;
else
return EC_ERROR_PARAM1;
baud = strtoi(argv[2], &e, 0);
if (*e || baud < 0)
return EC_ERROR_PARAM2;
usart_set_baud(usart, baud);
return EC_SUCCESS;
}
DECLARE_CONSOLE_COMMAND(baud, command_uart_baud, "usart[2|3|4] rate",
"Set baud rate on uart");
/******************************************************************************
* Hold the usart pins low while disabling it, or return it to normal.
*/
static int command_hold_usart_low(int argc, const char **argv)
{
/* Each bit represents if that port rx is being held low */
static int usart_status;
int usart_mask;
enum gpio_signal rx;
if (argc > 3 || argc < 2)
return EC_ERROR_PARAM_COUNT;
if (!strcasecmp(argv[1], "usart2")) {
usart_mask = 1 << 2;
rx = GPIO_USART2_SERVO_RX_DUT_TX;
} else if (!strcasecmp(argv[1], "usart3")) {
usart_mask = 1 << 3;
rx = GPIO_USART3_SERVO_RX_DUT_TX;
} else if (!strcasecmp(argv[1], "usart4")) {
usart_mask = 1 << 4;
rx = GPIO_USART4_SERVO_RX_DUT_TX;
} else {
return EC_ERROR_PARAM1;
}
/* Updating the status of this port */
if (argc == 3) {
char *e;
const int hold_low = strtoi(argv[2], &e, 0);
if (*e || (hold_low < 0) || (hold_low > 1))
return EC_ERROR_PARAM2;
if (!!(usart_status & usart_mask) == hold_low) {
/* Do nothing since there is no change */
} else if (hold_low) {
/*
* No need to shutdown UART, just de-mux the RX pin from
* UART and change it to a GPIO temporarily.
*/
gpio_config_pin(MODULE_USART, rx, 0);
gpio_set_flags(rx, GPIO_OUT_LOW);
/* Update global uart state */
usart_status |= usart_mask;
} else {
/*
* Mux the RX pin back to GPIO mode
*/
gpio_config_pin(MODULE_USART, rx, 1);
/* Update global uart state */
usart_status &= ~usart_mask;
}
}
/* Print status for get and set case. */
ccprintf("USART status: %s\n",
usart_status & usart_mask ? "held low" : "normal");
return EC_SUCCESS;
}
DECLARE_CONSOLE_COMMAND(hold_usart_low, command_hold_usart_low,
"usart[2|3|4] [0|1]?",
"Get/set the hold-low state for usart port");
/******************************************************************************
* Define the strings used in our USB descriptors.
*/
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("Servo Micro"),
[USB_STR_SERIALNO] = 0,
[USB_STR_VERSION] = USB_STRING_DESC(CROS_EC_VERSION32),
[USB_STR_SPI_NAME] = USB_STRING_DESC("SPI"),
[USB_STR_I2C_NAME] = USB_STRING_DESC("I2C"),
[USB_STR_USART4_STREAM_NAME] = USB_STRING_DESC("UART3"),
[USB_STR_CONSOLE_NAME] = USB_STRING_DESC("Servo Shell"),
[USB_STR_USART3_STREAM_NAME] = USB_STRING_DESC("CPU"),
[USB_STR_USART2_STREAM_NAME] = USB_STRING_DESC("EC"),
[USB_STR_UPDATE_NAME] = USB_STRING_DESC("Firmware update"),
};
BUILD_ASSERT(ARRAY_SIZE(usb_strings) == USB_STR_COUNT);
/******************************************************************************
* Support SPI bridging over USB, this requires usb_spi_board_enable and
* usb_spi_board_disable to be defined to enable and disable the SPI bridge.
*/
/* SPI devices */
const struct spi_device_t spi_devices[] = {
{ CONFIG_SPI_FLASH_PORT, 1, GPIO_SPI_CS },
};
const unsigned int spi_devices_used = ARRAY_SIZE(spi_devices);
void usb_spi_board_enable(struct usb_spi_config const *config)
{
/* Configure SPI GPIOs */
gpio_config_module(MODULE_SPI_FLASH, 1);
/* Set all four SPI pins to high speed */
STM32_GPIO_OSPEEDR(GPIO_B) |= 0xff000000;
/* Enable clocks to SPI2 module */
STM32_RCC_APB1ENR |= STM32_RCC_PB1_SPI2;
/* Reset SPI2 */
STM32_RCC_APB1RSTR |= STM32_RCC_PB1_SPI2;
STM32_RCC_APB1RSTR &= ~STM32_RCC_PB1_SPI2;
spi_enable(&spi_devices[0], 1);
}
void usb_spi_board_disable(struct usb_spi_config const *config)
{
spi_enable(&spi_devices[0], 0);
/* Disable clocks to SPI2 module */
STM32_RCC_APB1ENR &= ~STM32_RCC_PB1_SPI2;
/* Release SPI GPIOs */
gpio_config_module(MODULE_SPI_FLASH, 0);
}
USB_SPI_CONFIG(usb_spi, USB_IFACE_SPI, USB_EP_SPI, 0);
/******************************************************************************
* Support I2C bridging over USB.
*/
/* I2C ports */
const struct i2c_port_t i2c_ports[] = {
{ .name = "master",
.port = I2C_PORT_MASTER,
.kbps = 100,
.scl = GPIO_MASTER_I2C_SCL,
.sda = GPIO_MASTER_I2C_SDA },
};
const unsigned int i2c_ports_used = ARRAY_SIZE(i2c_ports);
int usb_i2c_board_is_enabled(void)
{
return 1;
}
/* Configure ITE flash support module */
const struct ite_dfu_config_t ite_dfu_config = {
.i2c_port = I2C_PORT_MASTER,
.scl = GPIO_MASTER_I2C_SCL,
.sda = GPIO_MASTER_I2C_SDA,
};
/******************************************************************************
* Initialize board.
*/
static void board_init(void)
{
/* USB to serial queues */
queue_init(&usart2_to_usb);
queue_init(&usb_to_usart2);
queue_init(&usart3_to_usb);
queue_init(&usb_to_usart3);
queue_init(&usart4_to_usb);
queue_init(&usb_to_usart4);
/* UART init */
usart_init(&usart2);
usart_init(&usart3);
usart_init(&usart4);
/* Enable GPIO expander. */
gpio_set_level(GPIO_TCA6416_RESET_L, 1);
/* Structured enpoints */
usb_spi_enable(&usb_spi, 1);
/* Enable UARTs by default. */
gpio_set_level(GPIO_UART1_EN_L, 0);
gpio_set_level(GPIO_UART2_EN_L, 0);
/* Disable power output. */
gpio_set_level(GPIO_SPI1_VREF_18, 0);
gpio_set_level(GPIO_SPI1_VREF_33, 0);
gpio_set_level(GPIO_SPI2_VREF_18, 0);
gpio_set_level(GPIO_SPI2_VREF_33, 0);
/* Enable UART3 routing. */
gpio_set_level(GPIO_SPI1_MUX_SEL, 1);
gpio_set_level(GPIO_SPI1_BUF_EN_L, 1);
gpio_set_level(GPIO_JTAG_BUFIN_EN_L, 0);
gpio_set_level(GPIO_SERVO_JTAG_TDO_BUFFER_EN, 1);
gpio_set_level(GPIO_SERVO_JTAG_TDO_SEL, 1);
}
DECLARE_HOOK(HOOK_INIT, board_init, HOOK_PRIO_DEFAULT);
/******************************************************************************
* Turn down USART before jumping to RW.
*/
static void board_jump(void)
{
/*
* If we don't shutdown the USARTs before jumping to RW, then when early
* RW tries to set the GPIOs to input (or anything other than alternate)
* the jump fail on some servo micros.
*
* It also make sense to shut them down since RW will reinitialize them
* in board_init above.
*/
usart_shutdown(&usart2);
usart_shutdown(&usart3);
usart_shutdown(&usart4);
/* Shutdown other hardware modules and let RW reinitialize them */
usb_spi_enable(&usb_spi, 0);
}
DECLARE_HOOK(HOOK_SYSJUMP, board_jump, HOOK_PRIO_DEFAULT);
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