283 lines
9 KiB
C
283 lines
9 KiB
C
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/*
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* Copyright (C) 2016, Intel Corporation. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "galileo-pinmux.h"
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#include <assert.h>
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#include "cy8c9540a.h"
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#include "gpio.h"
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#include <stdio.h>
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static cy8c9540a_bit_addr_t mux_bit_addrs[] = {
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{ 3, 4 }, /* IO0 */
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{ 3, 5 }, /* IO1 */
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{ 1, 7 }, /* IO2 */
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{ 1, 6 }, /* IO3 */
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{ CY8C9540A_BIT_ADDR_INVALID_PORT, 0 }, /* IO4 */
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{ CY8C9540A_BIT_ADDR_INVALID_PORT, 0 }, /* IO5 */
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{ CY8C9540A_BIT_ADDR_INVALID_PORT, 0 }, /* IO6 */
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{ CY8C9540A_BIT_ADDR_INVALID_PORT, 0 }, /* IO7 */
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{ CY8C9540A_BIT_ADDR_INVALID_PORT, 0 }, /* IO8 */
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{ CY8C9540A_BIT_ADDR_INVALID_PORT, 0 }, /* IO9 */
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{ 3, 6 }, /* IO10 */
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{ 3, 7 }, /* IO11 */
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{ 5, 2 }, /* IO12 */
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{ 5, 3 }, /* IO13 */
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{ 3, 1 }, /* A0 */
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{ 3, 0 }, /* A1 */
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{ 0, 7 }, /* A2 */
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{ 0, 6 }, /* A3 */
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{ 0, 5 }, /* A4 (also controlled by I2C mux) */
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{ 0, 4 }, /* A5 (also controlled by I2C mux) */
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};
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static cy8c9540a_bit_addr_t i2c_mux_bit_addr = { 1, 5 };
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/*---------------------------------------------------------------------------*/
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static void
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flatten_pin_num(galileo_pin_group_t grp, unsigned *pin)
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{
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if(grp == GALILEO_PIN_GRP_ANALOG) {
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*pin += GALILEO_NUM_DIGITAL_PINS;
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}
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assert(*pin < GALILEO_NUM_PINS);
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}
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/*---------------------------------------------------------------------------*/
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/* See galileo-gpio.c for the declaration of this function. */
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int
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galileo_brd_to_cpu_gpio_pin(unsigned pin, bool *sus)
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{
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assert(pin < GALILEO_NUM_PINS);
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*sus = false;
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switch(pin) {
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case 2:
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return 6;
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case 3:
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return 7;
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case 10:
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return 2;
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default:
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return -1; /* GPIO pin may be connected to the CY8C9540A chip, but not the
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CPU. */
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}
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}
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/*---------------------------------------------------------------------------*/
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static cy8c9540a_bit_addr_t cy8c9540a_gpio_mapping[] = {
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{ 4, 6 },
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{ 4, 7 },
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{ CY8C9540A_BIT_ADDR_INVALID_PORT, 0 },
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{ CY8C9540A_BIT_ADDR_INVALID_PORT, 0 },
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{ 1, 4 },
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{ 0, 1 },
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{ 1, 0 },
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{ 1, 3 },
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{ 1, 2 },
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{ 0, 3 },
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{ 0, 0 }, /* This driver configures IO10 to connect to CPU GPIO when setting
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IO10 to a digital mode, but hardware exists to alternately
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connect it to this pin of the CY8C9540A chip. */
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{ 1, 1 },
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{ 3, 2 },
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{ 3, 3 },
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{ 4, 0 },
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{ 4, 1 },
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{ 4, 2 },
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{ 4, 3 },
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{ 4, 4 },
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{ 4, 5 }
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};
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/* Map a board-level GPIO pin number to the address of the CY8C9540A pin that
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* implements it.
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*/
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cy8c9540a_bit_addr_t
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galileo_brd_to_cy8c9540a_gpio_pin(unsigned pin)
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{
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assert(pin < GALILEO_NUM_PINS);
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return cy8c9540a_gpio_mapping[pin];
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}
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/*---------------------------------------------------------------------------*/
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/* The I2C mux control must be set high to be able to access A4 and A5.
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*/
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static void
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set_i2c_mux(bool val)
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{
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cy8c9540a_write(i2c_mux_bit_addr, val);
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}
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/*---------------------------------------------------------------------------*/
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static void
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select_gpio_pwm(unsigned flat_pin, bool pwm)
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{
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bool mux_val;
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cy8c9540a_bit_addr_t mux_bit_addr;
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mux_bit_addr = mux_bit_addrs[flat_pin];
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if(mux_bit_addr.port != CY8C9540A_BIT_ADDR_INVALID_PORT) {
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mux_val = pwm || !(flat_pin == 2 || flat_pin == 3 || flat_pin == 10);
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cy8c9540a_write(mux_bit_addr, mux_val);
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}
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if((GALILEO_NUM_DIGITAL_PINS + 4) <= flat_pin) {
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/* This single control switches away from both I2C pins. */
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set_i2c_mux(true);
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}
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}
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/*---------------------------------------------------------------------------*/
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static void
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select_gpio(galileo_pin_group_t grp, unsigned pin, bool out)
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{
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bool sus;
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int cpu_pin;
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cy8c9540a_bit_addr_t gpio_bit_addr;
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flatten_pin_num(grp, &pin);
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select_gpio_pwm(pin, false);
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cpu_pin = galileo_brd_to_cpu_gpio_pin(pin, &sus);
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if(cpu_pin == -1) {
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gpio_bit_addr = galileo_brd_to_cy8c9540a_gpio_pin(pin);
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cy8c9540a_set_port_dir(gpio_bit_addr,
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out?
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CY8C9540A_PORT_DIR_OUT :
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CY8C9540A_PORT_DIR_IN);
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cy8c9540a_set_drive_mode(gpio_bit_addr,
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out?
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CY8C9540A_DRIVE_STRONG :
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CY8C9540A_DRIVE_HI_Z);
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} else {
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quarkX1000_gpio_config(cpu_pin,
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out? QUARKX1000_GPIO_OUT : QUARKX1000_GPIO_IN);
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}
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}
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/*---------------------------------------------------------------------------*/
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void
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galileo_pinmux_select_din(galileo_pin_group_t grp, unsigned pin)
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{
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select_gpio(grp, pin, false);
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}
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/*---------------------------------------------------------------------------*/
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void galileo_pinmux_select_dout(galileo_pin_group_t grp, unsigned pin)
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{
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select_gpio(grp, pin, true);
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}
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/*---------------------------------------------------------------------------*/
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void galileo_pinmux_select_pwm(unsigned pin)
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{
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switch(pin) {
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case 3:
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case 5:
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case 6:
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case 9:
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case 10:
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case 11:
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break;
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default:
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fprintf(stderr, "%s: invalid pin: %d.\n", __FUNCTION__, pin);
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halt();
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}
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select_gpio_pwm(pin, true);
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}
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/*---------------------------------------------------------------------------*/
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void galileo_pinmux_select_serial(unsigned pin)
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{
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assert(pin == 0 || pin == 1);
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cy8c9540a_write(mux_bit_addrs[pin], false);
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}
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/*---------------------------------------------------------------------------*/
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void galileo_pinmux_select_i2c(void)
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{
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set_i2c_mux(false);
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}
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/*---------------------------------------------------------------------------*/
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void galileo_pinmux_select_spi(void)
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{
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unsigned pin;
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for(pin = 11; pin <= 13; pin++) {
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cy8c9540a_write(mux_bit_addrs[pin], false);
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}
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}
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/*---------------------------------------------------------------------------*/
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void galileo_pinmux_select_analog(unsigned pin)
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{
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assert(pin < GALILEO_NUM_ANALOG_PINS);
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pin += GALILEO_NUM_DIGITAL_PINS;
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cy8c9540a_write(mux_bit_addrs[pin], false);
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if(4 <= pin) {
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/* This single control switches away from both I2C pins. */
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set_i2c_mux(true);
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}
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}
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/*---------------------------------------------------------------------------*/
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int
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galileo_pinmux_initialize(void)
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{
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int i;
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cy8c9540a_init();
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/* Configure all mux control pins as outputs. */
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for(i = 0; i < GALILEO_NUM_PINS; i++) {
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if(mux_bit_addrs[i].port == CY8C9540A_BIT_ADDR_INVALID_PORT) {
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continue;
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}
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cy8c9540a_set_port_dir(mux_bit_addrs[i], CY8C9540A_PORT_DIR_OUT);
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cy8c9540a_set_drive_mode(mux_bit_addrs[i], CY8C9540A_DRIVE_STRONG);
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}
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cy8c9540a_set_port_dir(i2c_mux_bit_addr, CY8C9540A_PORT_DIR_OUT);
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cy8c9540a_set_drive_mode(i2c_mux_bit_addr, CY8C9540A_DRIVE_STRONG);
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/* Activate default pinmux configuration. */
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galileo_pinmux_select_serial(0);
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galileo_pinmux_select_serial(1);
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galileo_pinmux_select_dout(GALILEO_PIN_GRP_DIGITAL, 2);
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galileo_pinmux_select_din(GALILEO_PIN_GRP_DIGITAL, 3);
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galileo_pinmux_select_din(GALILEO_PIN_GRP_DIGITAL, 4);
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galileo_pinmux_select_din(GALILEO_PIN_GRP_DIGITAL, 5);
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galileo_pinmux_select_din(GALILEO_PIN_GRP_DIGITAL, 6);
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galileo_pinmux_select_din(GALILEO_PIN_GRP_DIGITAL, 7);
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galileo_pinmux_select_din(GALILEO_PIN_GRP_DIGITAL, 8);
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galileo_pinmux_select_din(GALILEO_PIN_GRP_DIGITAL, 9);
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galileo_pinmux_select_dout(GALILEO_PIN_GRP_DIGITAL, 10);
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galileo_pinmux_select_din(GALILEO_PIN_GRP_DIGITAL, 11);
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galileo_pinmux_select_dout(GALILEO_PIN_GRP_DIGITAL, 12);
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galileo_pinmux_select_din(GALILEO_PIN_GRP_DIGITAL, 13);
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galileo_pinmux_select_analog(0);
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galileo_pinmux_select_analog(1);
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galileo_pinmux_select_analog(2);
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galileo_pinmux_select_analog(3);
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galileo_pinmux_select_i2c();
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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