diff options
Diffstat (limited to 'board')
| -rw-r--r-- | board/puff/Makefile | 21 | ||||
| -rw-r--r-- | board/puff/board.c | 62 | ||||
| -rw-r--r-- | board/puff/board.h | 4 | ||||
| -rw-r--r-- | board/puff/gpio.inc | 18 | ||||
| -rw-r--r-- | board/puff/port-sm.c | 126 | ||||
| -rw-r--r-- | board/puff/validate_port_power.c | 40 |
6 files changed, 262 insertions, 9 deletions
diff --git a/board/puff/Makefile b/board/puff/Makefile new file mode 100644 index 0000000000..bc7435ed75 --- /dev/null +++ b/board/puff/Makefile @@ -0,0 +1,21 @@ +# 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. +CLANG:=clang-6.0 +KLEE:=klee +KTEST_TOOL:=ktest-tool + +.PHONY: report +report: klee-last + $(KTEST_TOOL) \ + $(patsubst %.assert.err,%.ktest,$(wildcard klee-last/test*.assert.err)) + +klee-last: validate_port_power.bc + $(KLEE) --emit-all-errors $^ + +validate_port_power.bc: validate_port_power.c port-sm.c + $(CLANG) -emit-llvm -c -g -O0 -Xclang -disable-O0-optnone -o $@ $< + +.PHONY: clean +clean: + rm -rf validate_port_power.bc klee-last klee-out-* diff --git a/board/puff/board.c b/board/puff/board.c index 7e27178469..4e78186b6c 100644 --- a/board/puff/board.c +++ b/board/puff/board.c @@ -55,6 +55,61 @@ static void tcpc_alert_event(enum gpio_signal signal) schedule_deferred_pd_interrupt(0); } +#include "port-sm.c" + +static bool usbc_overcurrent; +/* + * Update USB port power limits based on current state. + * + * Port power consumption is assumed to be negligible if not overcurrent, + * and we have two knobs: the front port power limit, and the USB-C power limit. + * Either one of the front ports may run at high power (one at a time) or we + * can limit both to low power. On USB-C we can similarly limit the port power, + * but there's only one port. + */ +void update_port_limits(void) +{ + struct port_states state = { + .bitfield = (!gpio_get_level(GPIO_USB_A0_OC_ODL) + << PORTMASK_FRONT_A0) | + (!gpio_get_level(GPIO_USB_A1_OC_ODL) + << PORTMASK_FRONT_A1) | + (!gpio_get_level(GPIO_USB_A2_OC_ODL) + << PORTMASK_REAR_A0) | + (!gpio_get_level(GPIO_USB_A3_OC_ODL) + << PORTMASK_REAR_A1) | + (!gpio_get_level(GPIO_USB_A4_OC_ODL) + << PORTMASK_REAR_A2) | + (!gpio_get_level(GPIO_HDMI_CONN0_OC_ODL) + << PORTMASK_HDMI0) | + (!gpio_get_level(GPIO_HDMI_CONN1_OC_ODL) + << PORTMASK_HDMI1) | + ((ppc_is_sourcing_vbus(0) && usbc_overcurrent) + << PORTMASK_TYPEC), + .front_a_limited = gpio_get_level(GPIO_USB_A_LOW_PWR_OD), + /* Assume high-power; there's no way to poll this. */ + /* + * TODO(b/143190102) add a way to poll port power limit so we + * can detect when it can be increased again if the port is + * already active. + */ + .c_low_power = 0, + }; + + update_port_state(&state); + + ppc_set_vbus_source_current_limit(0, + state.c_low_power ? TYPEC_RP_1A5 : TYPEC_RP_3A0); + /* Output high limits power */ + gpio_set_level(GPIO_USB_A_LOW_PWR_OD, state.front_a_limited); +} +DECLARE_DEFERRED(update_port_limits); + +static void port_ocp_interrupt(enum gpio_signal signal) +{ + hook_call_deferred(&update_port_limits_data, 0); +} + #include "gpio_list.h" /* Must come after other header files. */ /******************************************************************************/ @@ -227,6 +282,7 @@ const unsigned int ina3221_count = ARRAY_SIZE(ina3221); static void board_init(void) { + update_port_limits(); } DECLARE_HOOK(HOOK_INIT, board_init, HOOK_PRIO_DEFAULT); @@ -236,6 +292,11 @@ struct ppc_config_t ppc_chips[CONFIG_USB_PD_PORT_MAX_COUNT] = { }; unsigned int ppc_cnt = ARRAY_SIZE(ppc_chips); +/* USB-A port control */ +const int usb_port_enable[USB_PORT_COUNT] = { + GPIO_EN_PP5000_USB_VBUS, +}; + /* Power Delivery and charging functions */ void baseboard_tcpc_init(void) { @@ -283,4 +344,5 @@ void board_overcurrent_event(int port, int is_overcurrented) /* Sanity check the port. */ if ((port < 0) || (port >= CONFIG_USB_PD_PORT_MAX_COUNT)) return; + usbc_overcurrent = is_overcurrented; } diff --git a/board/puff/board.h b/board/puff/board.h index 81fe94f363..85337b55af 100644 --- a/board/puff/board.h +++ b/board/puff/board.h @@ -143,7 +143,9 @@ #define CONFIG_USBC_VCONN_SWAP /* USB Type A Features */ -/* TODO: (b/143190102) Finish USB A config */ +#define CONFIG_USB_PORT_POWER_DUMB +/* There are five ports, but power enable is ganged across all of them. */ +#define USB_PORT_COUNT 1 /* I2C Bus Configuration */ #define CONFIG_I2C diff --git a/board/puff/gpio.inc b/board/puff/gpio.inc index f578c2b6c9..d66cf09c2f 100644 --- a/board/puff/gpio.inc +++ b/board/puff/gpio.inc @@ -36,6 +36,15 @@ GPIO_INT(USB_C0_TCPPC_INT_ODL, PIN(E, 0), GPIO_INT_FALLING, ppc_interrupt) GPIO_INT(USB_C0_TCPC_INT_ODL, PIN(6, 2), GPIO_INT_FALLING, tcpc_alert_event) GPIO_INT(H1_EC_RECOVERY_BTN_ODL, PIN(2, 4), GPIO_INT_BOTH, button_interrupt) +/* Port power control interrupts */ +GPIO_INT(HDMI_CONN0_OC_ODL, PIN(0, 7), GPIO_INT_BOTH, port_ocp_interrupt) +GPIO_INT(HDMI_CONN1_OC_ODL, PIN(0, 6), GPIO_INT_BOTH, port_ocp_interrupt) +GPIO_INT(USB_A0_OC_ODL, PIN(E, 4), GPIO_ODR_HIGH, port_ocp_interrupt) +GPIO_INT(USB_A1_OC_ODL, PIN(A, 2), GPIO_ODR_HIGH, port_ocp_interrupt) +GPIO_INT(USB_A2_OC_ODL, PIN(F, 5), GPIO_ODR_HIGH, port_ocp_interrupt) +GPIO_INT(USB_A3_OC_ODL, PIN(0, 3), GPIO_ODR_HIGH, port_ocp_interrupt) +GPIO_INT(USB_A4_OC_ODL, PIN(B, 0), GPIO_ODR_HIGH, port_ocp_interrupt) + /* PCH/CPU signals */ GPIO(EC_PCH_SYS_PWROK, PIN(3, 7), GPIO_OUT_LOW) GPIO(EC_PCH_RSMRST_L, PIN(A, 6), GPIO_OUT_LOW) @@ -63,12 +72,7 @@ GPIO(BJ_ADP_PRESENT_L, PIN(8, 2), GPIO_INPUT) /* USB type A */ GPIO(EN_PP5000_USB_VBUS, PIN(8, 3), GPIO_OUT_LOW) -GPIO(USB_A_LOW_PWR_OD, PIN(9, 4), GPIO_ODR_HIGH) -GPIO(USB_A0_OC_ODL, PIN(E, 4), GPIO_ODR_HIGH) -GPIO(USB_A1_OC_ODL, PIN(A, 2), GPIO_ODR_HIGH) -GPIO(USB_A2_OC_ODL, PIN(F, 5), GPIO_ODR_HIGH) -GPIO(USB_A3_OC_ODL, PIN(0, 3), GPIO_ODR_HIGH) -GPIO(USB_A4_OC_ODL, PIN(B, 0), GPIO_ODR_HIGH) +GPIO(USB_A_LOW_PWR_OD, PIN(9, 4), GPIO_ODR_LOW) /* USB type C */ GPIO(USB_C0_TCPC_RST, PIN(9, 7), GPIO_OUT_LOW) @@ -77,8 +81,6 @@ GPIO(USB_C0_TCPC_RST, PIN(9, 7), GPIO_OUT_LOW) GPIO(M2_SSD_PLN, PIN(A, 0), GPIO_INPUT) GPIO(EC_ENTERING_RW, PIN(E, 3), GPIO_OUT_LOW) GPIO(CCD_MODE_ODL, PIN(E, 5), GPIO_ODR_HIGH) -GPIO(HDMI_CONN0_OC_ODL, PIN(0, 7), GPIO_ODR_HIGH) -GPIO(HDMI_CONN1_OC_ODL, PIN(0, 6), GPIO_ODR_HIGH) GPIO(EN_PP_MST_OD, PIN(9, 6), GPIO_ODR_LOW) /* I2C pins - Alternate function below configures I2C module on these pins */ diff --git a/board/puff/port-sm.c b/board/puff/port-sm.c new file mode 100644 index 0000000000..d549b5754b --- /dev/null +++ b/board/puff/port-sm.c @@ -0,0 +1,126 @@ +/* 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. + */ + +struct port_states { + /* PORT_*n masks correspond to bits in this field */ + uint8_t bitfield; + /* If 1, type C is RP_1A5 (otherwise assumed to be RP_3A0) */ + uint8_t c_low_power; + /* If 1, front ports are current-limited */ + uint8_t front_a_limited; +}; + +#define PORTMASK_FRONT_A0 0 +#define PORTMASK_FRONT_A1 1 +#define PORTMASK_REAR_A0 2 +#define PORTMASK_REAR_A1 3 +#define PORTMASK_REAR_A2 4 +#define PORTMASK_HDMI0 5 +#define PORTMASK_HDMI1 6 +#define PORTMASK_TYPEC 7 + +#define PORT_FRONT_A0 (1 << PORTMASK_FRONT_A0) +#define PORT_FRONT_A1 (1 << PORTMASK_FRONT_A1) +#define PORT_REAR_A0 (1 << PORTMASK_REAR_A0) +#define PORT_REAR_A1 (1 << PORTMASK_REAR_A1) +#define PORT_REAR_A2 (1 << PORTMASK_REAR_A2) +#define PORT_HDMI0 (1 << PORTMASK_HDMI0) +#define PORT_HDMI1 (1 << PORTMASK_HDMI1) +#define PORT_TYPEC (1 << PORTMASK_TYPEC) +#define PORT_ENABLED(id) (!!(states->bitfield & (PORT_##id))) + +#define PWR_FRONT_HIGH 1603 +#define PWR_FRONT_LOW 963 +#define PWR_REAR 1075 +#define PWR_HDMI 562 +#define PWR_C_HIGH 3740 +#define PWR_C_LOW 2090 + +/* + * Calculate the amount of power (in mA) available on the 5V rail. + * + * If negative, the system is at risk of browning out. + */ +int compute_headroom(const struct port_states *states) +{ + int headroom = 10000 - 1335; /* Capacity less base load */ + + headroom -= PWR_HDMI * (PORT_ENABLED(HDMI0) + PORT_ENABLED(HDMI1)); + headroom -= PWR_REAR * (PORT_ENABLED(REAR_A0) + PORT_ENABLED(REAR_A1) + + PORT_ENABLED(REAR_A2)); + + switch (PORT_ENABLED(FRONT_A0) + PORT_ENABLED(FRONT_A1)) { + case 2: + headroom -= PWR_FRONT_LOW + (states->front_a_limited ? + PWR_FRONT_LOW : + PWR_FRONT_HIGH); + break; + case 1: + headroom -= states->front_a_limited ? PWR_FRONT_LOW : + PWR_FRONT_HIGH; + break; + default: + break; + } + + if (PORT_ENABLED(TYPEC)) + headroom -= states->c_low_power ? PWR_C_LOW : PWR_C_HIGH; + + return headroom; +} + +/* + * Update states to stay within the 5V rail power budget. + * + * Only the current limits (c_low_power and front_a_limited) are effective. + * + * The goal here is to ensure that any single state change from what we set + * (specifically, something being plugged into a port) does not exceed the 5V + * power budget. + */ +void update_port_state(struct port_states *states) +{ + int headroom = compute_headroom(states); + + if (!PORT_ENABLED(TYPEC)) { + /* + * USB-C not in use, prefer to adjust it. We may still need + * to limit front port power. + * + * We want to run the front type-A ports at high power, and they + * may be limited so we need to account for the extra power + * we may be allowing the front ports to draw. + */ + if (headroom > + (PWR_C_HIGH + (PWR_FRONT_HIGH - PWR_FRONT_LOW))) { + states->front_a_limited = 0; + states->c_low_power = 0; + } else { + states->front_a_limited = + headroom < + (PWR_C_LOW + (PWR_FRONT_HIGH - PWR_FRONT_LOW)); + states->c_low_power = 1; + } + } else { + /* + * USB-C is in use, prefer to drop front port limits. + * Pessimistically Assume C is currently in low-power mode. + */ + if (headroom > (PWR_C_HIGH - PWR_C_LOW + PWR_FRONT_HIGH)) { + /* Can still go full power */ + states->front_a_limited = 0; + states->c_low_power = 0; + } else if (headroom > + (PWR_C_HIGH - PWR_C_LOW + PWR_FRONT_LOW)) { + /* Reducing front allows C to go to full power */ + states->front_a_limited = 1; + states->c_low_power = 0; + } else { + /* Must reduce both */ + states->front_a_limited = 1; + states->c_low_power = 1; + } + } +} diff --git a/board/puff/validate_port_power.c b/board/puff/validate_port_power.c new file mode 100644 index 0000000000..7afc870fc1 --- /dev/null +++ b/board/puff/validate_port_power.c @@ -0,0 +1,40 @@ +/* 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. + */ + +#include <klee/klee.h> + +#include "port-sm.c" + +int main(void) +{ + uint8_t bitfield = klee_range(0, 256, "port_bitmask"); + uint8_t c_low_power = klee_range(0, 2, "c_low_power"); + uint8_t front_a_limited = klee_range(0, 2, "front_a_limited"); + struct port_states states = { + .bitfield = bitfield, + .c_low_power = c_low_power, + .front_a_limited = front_a_limited + }; + /* + * Assume illegal states with no headroom cannot be reached in the first + * place. + */ + klee_assume(compute_headroom(&states) >= 0); + + update_port_state(&states); + + /* + * Plug something into an unused port and ensure we still have + * non-negative headroom. + */ + uint8_t enable_port = (uint8_t)klee_range(0, 8, "enable_port"); + uint8_t enable_mask = 1 << enable_port; + + klee_assume((states.bitfield & enable_mask) == 0); + states.bitfield |= enable_mask; + klee_assert(compute_headroom(&states) >= 0); + + return 0; +} |