nes-proj/platform/galileo/drivers/galileo-gen1-pinmux.c
Michael LeMay 4181179985 galileo: Add support for Gen. 1 pinmux and GPIO
This patch adds support for IO pinmuxing and GPIO on first generation
Intel Galileo boards.
2016-08-23 13:02:39 -07:00

283 lines
9.0 KiB
C

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