107 lines
2.5 KiB
C
107 lines
2.5 KiB
C
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/* Copyright 2016 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "case_closed_debug.h"
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#include "ccd_config.h"
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#include "console.h"
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#include "gpio.h"
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#include "hooks.h"
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#include "i2c.h"
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#include "rdd.h"
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#include "registers.h"
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#include "system.h"
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#include "timer.h"
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#include "usb_i2c.h"
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#define CPRINTS(format, args...) cprints(CC_USB, format, ## args)
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int usb_i2c_board_is_enabled(void)
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{
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/* board options use the INA pins as GPIOs */
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if (!board_has_ina_support())
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return 0;
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/*
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* Note that this signal requires an external pullup, because this is
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* one of the real open drain pins; we cannot pull it up or drive it
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* high. On test boards without the pullup, this will mis-detect as
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* enabled.
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*/
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return !gpio_get_level(GPIO_EN_PP3300_INA_L);
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}
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static void ina_disconnect(void)
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{
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CPRINTS("I2C disconnect");
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/* Disonnect I2C0 SDA/SCL output to B1/B0 pads */
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GWRITE(PINMUX, DIOB1_SEL, 0);
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GWRITE(PINMUX, DIOB0_SEL, 0);
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/* Disconnect B1/B0 pads to I2C0 input SDA/SCL */
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GWRITE(PINMUX, I2C0_SDA_SEL, 0);
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GWRITE(PINMUX, I2C0_SCL_SEL, 0);
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/* Disable power to INA chips */
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gpio_set_level(GPIO_EN_PP3300_INA_L, 1);
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}
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static void ina_connect(void)
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{
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CPRINTS("I2C connect");
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/* Apply power to INA chips */
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gpio_set_level(GPIO_EN_PP3300_INA_L, 0);
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/*
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* Connect B0/B1 pads to I2C0 input SDA/SCL. Note, that the inputs
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* for these pads are already enabled for the gpio signals I2C_SCL_INA
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* and I2C_SDA_INA in gpio.inc.
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*/
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GWRITE(PINMUX, I2C0_SDA_SEL, GC_PINMUX_DIOB1_SEL);
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GWRITE(PINMUX, I2C0_SCL_SEL, GC_PINMUX_DIOB0_SEL);
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/* Connect I2CS SDA/SCL output to B1/B0 pads */
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GWRITE(PINMUX, DIOB1_SEL, GC_PINMUX_I2C0_SDA_SEL);
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GWRITE(PINMUX, DIOB0_SEL, GC_PINMUX_I2C0_SCL_SEL);
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/*
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* Initialize the i2cm module after the INAs are powered and the signal
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* lines are connected.
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*/
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i2cm_init();
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}
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void usb_i2c_board_disable(void)
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{
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if (!usb_i2c_board_is_enabled())
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return;
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ina_disconnect();
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}
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int usb_i2c_board_enable(void)
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{
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/* board options use the INA pins as GPIOs */
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if (!board_has_ina_support())
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return EC_SUCCESS;
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if (servo_is_connected()) {
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CPRINTS("Servo attached; cannot enable I2C");
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usb_i2c_board_disable();
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return EC_ERROR_BUSY;
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}
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if (!ccd_ext_is_enabled())
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return EC_ERROR_BUSY;
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if (!ccd_is_cap_enabled(CCD_CAP_I2C))
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return EC_ERROR_ACCESS_DENIED;
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if (!usb_i2c_board_is_enabled())
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ina_connect();
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return EC_SUCCESS;
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}
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