71 lines
1.7 KiB
C
71 lines
1.7 KiB
C
/* Copyright 2017 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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/* I2C module driver depends on chip series for Chrome EC */
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#include "common.h"
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#include "i2c.h"
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#include "i2c_chip.h"
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#include "registers.h"
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#include "util.h"
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/*****************************************************************************/
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/* IC specific low-level driver depends on chip series */
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int i2c_port_to_controller(int port)
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{
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if (port < 0 || port >= I2C_PORT_COUNT)
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return -1;
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if (port <= NPCX_I2C_PORT3_0)
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return port;
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#ifndef NPCX_PSL_MODE_SUPPORT
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else if (port == NPCX_I2C_PORT4_0)
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return 4;
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#endif
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else /* If port >= NPCX_I2C_PORT4_1 */
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return 4 + ((port - NPCX_I2C_PORT4_1 + 1) / 2);
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}
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void i2c_select_port(int port)
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{
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/* Only I2C 4/5/6 have multiple ports in series npcx7 */
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if (port <= NPCX_I2C_PORT3_0 || port >= NPCX_I2C_PORT7_0)
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return;
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/* Select I2C ports for the same controller */
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else if (port <= NPCX_I2C_PORT4_1) {
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UPDATE_BIT(NPCX_GLUE_SMBSEL, NPCX_SMBSEL_SMB4SEL,
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(port == NPCX_I2C_PORT4_1));
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} else if (port <= NPCX_I2C_PORT5_1) {
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UPDATE_BIT(NPCX_GLUE_SMBSEL, NPCX_SMBSEL_SMB5SEL,
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(port == NPCX_I2C_PORT5_1));
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} else {
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UPDATE_BIT(NPCX_GLUE_SMBSEL, NPCX_SMBSEL_SMB6SEL,
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(port == NPCX_I2C_PORT6_1));
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}
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}
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int i2c_is_raw_mode(int port)
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{
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int group, bit;
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if (port == NPCX_I2C_PORT4_1 || port == NPCX_I2C_PORT5_1 ||
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port == NPCX_I2C_PORT6_1) {
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group = 6;
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bit = 7 - (port - NPCX_I2C_PORT4_1) / 2;
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} else {
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group = 2;
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if (port <= NPCX_I2C_PORT3_0)
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bit = 2 * port;
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else
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bit = I2C_PORT_COUNT - port;
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}
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if (IS_BIT_SET(NPCX_DEVALT(group), bit))
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return 0;
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else
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return 1;
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}
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