diff options
Diffstat (limited to 'board/fluffy/board.c')
| -rw-r--r-- | board/fluffy/board.c | 405 |
1 files changed, 405 insertions, 0 deletions
diff --git a/board/fluffy/board.c b/board/fluffy/board.c new file mode 100644 index 0000000000..4631b4a851 --- /dev/null +++ b/board/fluffy/board.c @@ -0,0 +1,405 @@ +/* Copyright 2019 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. + */ + +/* Fluffy configuration */ + +#include "adc.h" +#include "adc_chip.h" +#include "common.h" +#include "console.h" +#include "ec_version.h" +#include "hooks.h" +#include "i2c.h" +#include "usb_descriptor.h" +#include "registers.h" +#include "timer.h" +#include "usb_pd.h" +#include "util.h" + +#include "gpio_list.h" + +#define CPRINTS(format, args...) cprints(CC_SYSTEM, format, ## args) +#define CPRINTF(format, args...) cprintf(CC_SYSTEM, format, ## args) + +/****************************************************************************** + * 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("Fluffy"), + /* This gets filled in at runtime. */ + [USB_STR_SERIALNO] = USB_STRING_DESC(""), + [USB_STR_VERSION] = USB_STRING_DESC(CROS_EC_VERSION32), + [USB_STR_CONSOLE_NAME] = USB_STRING_DESC("Fluffy Shell"), +}; + +BUILD_ASSERT(ARRAY_SIZE(usb_strings) == USB_STR_COUNT); + +/* ADC channels */ +const struct adc_t adc_channels[] = { + /* Sensing the VBUS voltage at the DUT side. Converted to mV. */ + [ADC_PPVAR_VBUS_DUT] = { + .name = "PPVAR_VBUS_DUT", + .factor_mul = 3300, + .factor_div = 4096, + .shift = 0, + .channel = STM32_AIN(0), + }, +}; +BUILD_ASSERT(ARRAY_SIZE(adc_channels) == ADC_CH_COUNT); + +/* I2C ports */ +const struct i2c_port_t i2c_ports[] = { + { + .name = "master", + .port = 1, + .kbps = 400, + .scl = GPIO_I2C_SCL, + .sda = GPIO_I2C_SDA, + }, +}; +const unsigned int i2c_ports_used = ARRAY_SIZE(i2c_ports); + +static enum gpio_signal enabled_port = GPIO_EN_C0; +static uint8_t output_en; + +static void print_port_status(void) +{ + if (!output_en) + CPRINTS("No ports enabled. zZZ"); + else + CPRINTS("Port %d is ON", enabled_port - GPIO_EN_C0); + + CPRINTS("CC Flip: %s", gpio_get_level(GPIO_EN_CC_FLIP) ? "YES" : "NO"); + CPRINTS("USB MUX: %s", gpio_get_level(GPIO_EN_USB_MUX2) ? "ON" : "OFF"); +} + +static int command_cc_flip(int argc, char *argv[]) +{ + int enable; + + if (argc != 2) + return EC_ERROR_PARAM_COUNT; + + if (!parse_bool(argv[1], &enable)) + return EC_ERROR_INVAL; + + if (output_en) { + gpio_set_level(enabled_port, 0); + gpio_set_level(GPIO_EN_USB_MUX2, 0); + /* Wait long enough for CC to discharge. */ + usleep(500 * MSEC); + } + + gpio_set_level(GPIO_EN_CC_FLIP, enable); + /* Allow some time for new CC configuration to settle. */ + usleep(500 * MSEC); + + if (output_en) { + gpio_set_level(enabled_port, 1); + gpio_set_level(GPIO_EN_USB_MUX2, 1); + } + + print_port_status(); + return EC_SUCCESS; +} +DECLARE_CONSOLE_COMMAND(ccflip, command_cc_flip, + "<enable/disable>", + "enable or disable flipping CC orientation"); +/* + * Support tca6416 I2C ioexpander. + */ +#define GPIOX_I2C_ADDR__7bf 0x20 +#define GPIOX_IN_PORT_A 0x0 +#define GPIOX_IN_PORT_B 0x1 +#define GPIOX_OUT_PORT_A 0x2 +#define GPIOX_OUT_PORT_B 0x3 +#define GPIOX_DIR_PORT_A 0x6 +#define GPIOX_DIR_PORT_B 0x7 +#define I2C_PORT_MASTER 1 + +static void i2c_expander_init(void) +{ + gpio_set_level(GPIO_XP_RESET_L, 1); + + /* + * Setup P00, P02, P04, P10, and P12 on the I/O expander as an output. + */ + i2c_write8__7bf(I2C_PORT_MASTER, GPIOX_I2C_ADDR__7bf, + GPIOX_DIR_PORT_A, 0xea); + i2c_write8__7bf(I2C_PORT_MASTER, GPIOX_I2C_ADDR__7bf, + GPIOX_DIR_PORT_B, 0xfa); +} +DECLARE_HOOK(HOOK_INIT, i2c_expander_init, HOOK_PRIO_INIT_I2C+1); + +/* Write to a GPIO register on the tca6416 I2C ioexpander. */ +static void write_ioexpander(int bank, int gpio, int reg, int val) +{ + int tmp; + + /* Read output port register */ + i2c_read8__7bf(I2C_PORT_MASTER, GPIOX_I2C_ADDR__7bf, + reg + bank, &tmp); + if (val) + tmp |= BIT(gpio); + else + tmp &= ~BIT(gpio); + /* Write back modified output port register */ + i2c_write8__7bf(I2C_PORT_MASTER, GPIOX_I2C_ADDR__7bf, + reg + bank, tmp); +} + +enum led_ch { + LED_5V = 0, + LED_9V, + LED_12V, + LED_15V, + LED_20V, + LED_COUNT, +}; + +static void set_led(enum led_ch led, int enable) +{ + int bank; + int gpio; + + switch (led) { + case LED_5V: + bank = 0; + gpio = 0; + break; + + case LED_9V: + bank = 0; + gpio = 2; + break; + + case LED_12V: + bank = 0; + gpio = 4; + break; + + case LED_15V: + bank = 1; + gpio = 0; + break; + + case LED_20V: + bank = 1; + gpio = 2; + break; + + default: + return; + } + + /* + * Setup the LED as an output if enabled, otherwise as an input to keep + * the LEDs off. + */ + write_ioexpander(bank, gpio, GPIOX_DIR_PORT_A, !enable); + + /* The LEDs are active low. */ + if (enable) + write_ioexpander(bank, gpio, GPIOX_OUT_PORT_A, 0); +} + +void show_output_voltage_on_leds(void); +DECLARE_DEFERRED(show_output_voltage_on_leds); + +static void board_init(void) +{ + /* Do a sweeping LED dance. */ + for (enum led_ch led = 0; led < LED_COUNT; led++) { + set_led(led, 1); + msleep(100); + } + + msleep(500); + + for (enum led_ch led = 0; led < LED_COUNT; led++) + set_led(led, 0); + + show_output_voltage_on_leds(); +} +DECLARE_HOOK(HOOK_INIT, board_init, HOOK_PRIO_DEFAULT); + + +enum usb_mux { + USB_MUX0 = 0, + USB_MUX1, + USB_MUX2, + USB_MUX_COUNT, +}; + +static void set_mux(enum usb_mux mux, uint8_t val) +{ + enum gpio_signal c0; + enum gpio_signal c1; + enum gpio_signal c2; + + switch (mux) { + case USB_MUX0: + c0 = GPIO_USB_MUX0_C0; + c1 = GPIO_USB_MUX0_C1; + c2 = GPIO_USB_MUX0_C2; + break; + + case USB_MUX1: + c0 = GPIO_USB_MUX1_C0; + c1 = GPIO_USB_MUX1_C1; + c2 = GPIO_USB_MUX1_C2; + break; + + case USB_MUX2: + c0 = GPIO_USB_MUX2_C0; + c1 = GPIO_USB_MUX2_C1; + c2 = GPIO_USB_MUX2_C2; + break; + + default: + break; + } + + val &= 0x7; + + gpio_set_level(c0, val & BIT(0)); + gpio_set_level(c1, val & BIT(1)); + gpio_set_level(c2, val & BIT(2)); +} + +/* This function assumes only 1 port works at a time. */ +static int command_portctl(int argc, char **argv) +{ + int port; + int enable; + + if (argc < 2) + return EC_ERROR_PARAM_COUNT; + + port = atoi(argv[1]); + if ((port < 0) || (port > 19) || !parse_bool(argv[2], &enable)) + return EC_ERROR_INVAL; + + gpio_set_level(GPIO_EN_USB_MUX2, 0); + + /* + * For each port, we must configure the USB 2.0 muxes and make sure that + * the power enables are configured as desired. + */ + + gpio_set_level(enabled_port, 0); + if (enabled_port != GPIO_EN_C0 + port) + CPRINTS("Port %d: disabled", enabled_port-GPIO_EN_C0); + + /* Allow time for an "unplug" to allow VBUS and CC to fall. */ + usleep(1 * SECOND); + + /* + * The USB 2.0 lines are arranged using 3x 8:1 muxes. Ports 0-7 are + * handled by the first mux, ports 8-15 are handled by the 2nd mux, then + * the outputs of those muxes are fed into the third mux along with + * ports 16-19. The schematic contains the truth table. + */ + if (enable) { + enabled_port = GPIO_EN_C0 + port; + gpio_set_level(enabled_port, 1); + + if (port < 8) { + set_mux(USB_MUX0, 7-port); + set_mux(USB_MUX2, 3); + } else if (port < 16) { + if (port < 14) + set_mux(USB_MUX1, 5-(port-8)); + else + set_mux(USB_MUX1, 7-(port-14)); + + set_mux(USB_MUX2, 1); + } else { + set_mux(USB_MUX2, 7-(port-16)); + } + + gpio_set_level(GPIO_EN_USB_MUX2, 1); + output_en = 1; + } else { + gpio_set_level(enabled_port, 0); + output_en = 0; + } + + print_port_status(); + return EC_SUCCESS; +} + +DECLARE_CONSOLE_COMMAND(portctl, command_portctl, + "<port# 0-19> <enable/disable>", + "enable or disable a port"); + +static int command_status(int argc, char **argv) +{ + int vbus_mv = adc_read_channel(ADC_PPVAR_VBUS_DUT); + + CPRINTS("PPVAR_VBUS_DUT: %dmV (raw: %d)", vbus_mv*7692/1000, + vbus_mv); + print_port_status(); + + return EC_SUCCESS; +} +DECLARE_CONSOLE_COMMAND(status, command_status, NULL, "show current status"); + +/* + * According to the USB PD Spec, the minimum voltage for a fixed source is 95% + * of the new source voltage with an additional 500mV drop. + * + * vSrcNew | min | vSrcNew(min) + vSrcValid + * 5V | 4.75V | 4.25V | 553mV + * 9V | 8.55V | 8.05V | 1047mV + * 12V | 11.4V | 10.9V | 1417mV + * 15V | 14.25V | 13.75V | 1788mV + * 20V | 19V | 18.5V | 2405mV + * + * With the resistor divider that fluffy has, the ADC is only seeing 0.13 of the + * actual voltage. + */ +void show_output_voltage_on_leds(void) +{ + int vbus_mv = adc_read_channel(ADC_PPVAR_VBUS_DUT); + static int prev_vbus_mv; + int i; + int act; + enum led_ch max_on_exclusive = LED_5V; + + if (vbus_mv != ADC_READ_ERROR) { + if (vbus_mv >= 2405) + max_on_exclusive = LED_COUNT; + else if (vbus_mv >= 1788) + max_on_exclusive = LED_20V; + else if (vbus_mv >= 1417) + max_on_exclusive = LED_15V; + else if (vbus_mv >= 1047) + max_on_exclusive = LED_12V; + else if (vbus_mv >= 553) + max_on_exclusive = LED_9V; + + for (i = 0; i < LED_COUNT; i++) + set_led(i, i < max_on_exclusive); + + act = (vbus_mv * 7692) / 1000; + if ((vbus_mv > prev_vbus_mv+2) || (vbus_mv < prev_vbus_mv-2)) { + CPRINTS("PPVAR_VBUS_DUT: %d mV (raw: %d)", act, + vbus_mv); + prev_vbus_mv = vbus_mv; + } + } + + /* + * The reason we reschedule this ourselves as opposed to declaring it as + * a hook with a HOOK_TICK period is to allow the LED sweep sequence + * when the board boots up. + */ + hook_call_deferred(&show_output_voltage_on_leds_data, + 500 * MSEC); +} |