345 lines
9.1 KiB
C
345 lines
9.1 KiB
C
/*
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* max3107.c - spi uart protocol driver for Maxim 3107
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* Based on max3100.c
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* by Christian Pellegrin <chripell@evolware.org>
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* and max3110.c
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* by Feng Tang <feng.tang@intel.com>
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*
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* Copyright (C) Aavamobile 2009
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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*/
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/serial_core.h>
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#include <linux/serial.h>
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#include <linux/spi/spi.h>
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#include <linux/freezer.h>
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#include <linux/platform_device.h>
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#include <linux/gpio.h>
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#include <linux/sfi.h>
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#include <asm/mrst.h>
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#include "max3107.h"
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/* GPIO direction to input function */
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static int max3107_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
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{
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struct max3107_port *s = container_of(chip, struct max3107_port, chip);
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u16 buf[1]; /* Buffer for SPI transfer */
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if (offset >= MAX3107_GPIO_COUNT) {
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dev_err(&s->spi->dev, "Invalid GPIO\n");
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return -EINVAL;
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}
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/* Read current GPIO configuration register */
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buf[0] = MAX3107_GPIOCFG_REG;
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/* Perform SPI transfer */
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if (max3107_rw(s, (u8 *)buf, (u8 *)buf, 2)) {
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dev_err(&s->spi->dev, "SPI transfer GPIO read failed\n");
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return -EIO;
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}
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buf[0] &= MAX3107_SPI_RX_DATA_MASK;
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/* Set GPIO to input */
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buf[0] &= ~(0x0001 << offset);
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/* Write new GPIO configuration register value */
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buf[0] |= (MAX3107_WRITE_BIT | MAX3107_GPIOCFG_REG);
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/* Perform SPI transfer */
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if (max3107_rw(s, (u8 *)buf, NULL, 2)) {
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dev_err(&s->spi->dev, "SPI transfer GPIO write failed\n");
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return -EIO;
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}
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return 0;
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}
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/* GPIO direction to output function */
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static int max3107_gpio_direction_out(struct gpio_chip *chip, unsigned offset,
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int value)
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{
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struct max3107_port *s = container_of(chip, struct max3107_port, chip);
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u16 buf[2]; /* Buffer for SPI transfers */
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if (offset >= MAX3107_GPIO_COUNT) {
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dev_err(&s->spi->dev, "Invalid GPIO\n");
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return -EINVAL;
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}
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/* Read current GPIO configuration and data registers */
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buf[0] = MAX3107_GPIOCFG_REG;
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buf[1] = MAX3107_GPIODATA_REG;
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/* Perform SPI transfer */
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if (max3107_rw(s, (u8 *)buf, (u8 *)buf, 4)) {
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dev_err(&s->spi->dev, "SPI transfer gpio failed\n");
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return -EIO;
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}
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buf[0] &= MAX3107_SPI_RX_DATA_MASK;
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buf[1] &= MAX3107_SPI_RX_DATA_MASK;
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/* Set GPIO to output */
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buf[0] |= (0x0001 << offset);
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/* Set value */
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if (value)
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buf[1] |= (0x0001 << offset);
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else
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buf[1] &= ~(0x0001 << offset);
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/* Write new GPIO configuration and data register values */
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buf[0] |= (MAX3107_WRITE_BIT | MAX3107_GPIOCFG_REG);
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buf[1] |= (MAX3107_WRITE_BIT | MAX3107_GPIODATA_REG);
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/* Perform SPI transfer */
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if (max3107_rw(s, (u8 *)buf, NULL, 4)) {
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dev_err(&s->spi->dev,
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"SPI transfer for GPIO conf data w failed\n");
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return -EIO;
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}
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return 0;
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}
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/* GPIO value query function */
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static int max3107_gpio_get(struct gpio_chip *chip, unsigned offset)
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{
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struct max3107_port *s = container_of(chip, struct max3107_port, chip);
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u16 buf[1]; /* Buffer for SPI transfer */
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if (offset >= MAX3107_GPIO_COUNT) {
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dev_err(&s->spi->dev, "Invalid GPIO\n");
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return -EINVAL;
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}
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/* Read current GPIO data register */
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buf[0] = MAX3107_GPIODATA_REG;
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/* Perform SPI transfer */
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if (max3107_rw(s, (u8 *)buf, (u8 *)buf, 2)) {
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dev_err(&s->spi->dev, "SPI transfer GPIO data r failed\n");
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return -EIO;
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}
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buf[0] &= MAX3107_SPI_RX_DATA_MASK;
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/* Return value */
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return buf[0] & (0x0001 << offset);
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}
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/* GPIO value set function */
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static void max3107_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
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{
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struct max3107_port *s = container_of(chip, struct max3107_port, chip);
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u16 buf[2]; /* Buffer for SPI transfers */
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if (offset >= MAX3107_GPIO_COUNT) {
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dev_err(&s->spi->dev, "Invalid GPIO\n");
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return;
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}
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/* Read current GPIO configuration registers*/
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buf[0] = MAX3107_GPIODATA_REG;
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buf[1] = MAX3107_GPIOCFG_REG;
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/* Perform SPI transfer */
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if (max3107_rw(s, (u8 *)buf, (u8 *)buf, 4)) {
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dev_err(&s->spi->dev,
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"SPI transfer for GPIO data and config read failed\n");
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return;
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}
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buf[0] &= MAX3107_SPI_RX_DATA_MASK;
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buf[1] &= MAX3107_SPI_RX_DATA_MASK;
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if (!(buf[1] & (0x0001 << offset))) {
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/* Configured as input, can't set value */
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dev_warn(&s->spi->dev,
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"Trying to set value for input GPIO\n");
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return;
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}
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/* Set value */
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if (value)
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buf[0] |= (0x0001 << offset);
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else
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buf[0] &= ~(0x0001 << offset);
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/* Write new GPIO data register value */
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buf[0] |= (MAX3107_WRITE_BIT | MAX3107_GPIODATA_REG);
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/* Perform SPI transfer */
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if (max3107_rw(s, (u8 *)buf, NULL, 2))
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dev_err(&s->spi->dev, "SPI transfer GPIO data w failed\n");
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}
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/* GPIO chip data */
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static struct gpio_chip max3107_gpio_chip = {
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.owner = THIS_MODULE,
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.direction_input = max3107_gpio_direction_in,
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.direction_output = max3107_gpio_direction_out,
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.get = max3107_gpio_get,
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.set = max3107_gpio_set,
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.can_sleep = 1,
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.base = MAX3107_GPIO_BASE,
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.ngpio = MAX3107_GPIO_COUNT,
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};
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/**
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* max3107_aava_reset - reset on AAVA systems
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* @spi: The SPI device we are probing
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*
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* Reset the device ready for probing.
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*/
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static int max3107_aava_reset(struct spi_device *spi)
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{
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/* Reset the chip */
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if (gpio_request(MAX3107_RESET_GPIO, "max3107")) {
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pr_err("Requesting RESET GPIO failed\n");
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return -EIO;
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}
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if (gpio_direction_output(MAX3107_RESET_GPIO, 0)) {
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pr_err("Setting RESET GPIO to 0 failed\n");
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gpio_free(MAX3107_RESET_GPIO);
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return -EIO;
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}
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msleep(MAX3107_RESET_DELAY);
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if (gpio_direction_output(MAX3107_RESET_GPIO, 1)) {
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pr_err("Setting RESET GPIO to 1 failed\n");
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gpio_free(MAX3107_RESET_GPIO);
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return -EIO;
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}
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gpio_free(MAX3107_RESET_GPIO);
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msleep(MAX3107_WAKEUP_DELAY);
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return 0;
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}
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static int max3107_aava_configure(struct max3107_port *s)
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{
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int retval;
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/* Initialize GPIO chip data */
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s->chip = max3107_gpio_chip;
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s->chip.label = s->spi->modalias;
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s->chip.dev = &s->spi->dev;
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/* Add GPIO chip */
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retval = gpiochip_add(&s->chip);
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if (retval) {
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dev_err(&s->spi->dev, "Adding GPIO chip failed\n");
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return retval;
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}
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/* Temporary fix for EV2 boot problems, set modem reset to 0 */
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max3107_gpio_direction_out(&s->chip, 3, 0);
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return 0;
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}
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#if 0
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/* This will get enabled once we have the board stuff merged for this
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specific case */
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static const struct baud_table brg13_ext[] = {
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{ 300, MAX3107_BRG13_B300 },
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{ 600, MAX3107_BRG13_B600 },
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{ 1200, MAX3107_BRG13_B1200 },
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{ 2400, MAX3107_BRG13_B2400 },
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{ 4800, MAX3107_BRG13_B4800 },
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{ 9600, MAX3107_BRG13_B9600 },
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{ 19200, MAX3107_BRG13_B19200 },
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{ 57600, MAX3107_BRG13_B57600 },
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{ 115200, MAX3107_BRG13_B115200 },
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{ 230400, MAX3107_BRG13_B230400 },
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{ 460800, MAX3107_BRG13_B460800 },
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{ 921600, MAX3107_BRG13_B921600 },
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{ 0, 0 }
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};
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static void max3107_aava_init(struct max3107_port *s)
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{
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/*override for AAVA SC specific*/
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if (mrst_platform_id() == MRST_PLATFORM_AAVA_SC) {
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if (get_koski_build_id() <= KOSKI_EV2)
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if (s->ext_clk) {
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s->brg_cfg = MAX3107_BRG13_B9600;
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s->baud_tbl = (struct baud_table *)brg13_ext;
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}
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}
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}
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#endif
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static int __devexit max3107_aava_remove(struct spi_device *spi)
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{
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struct max3107_port *s = dev_get_drvdata(&spi->dev);
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/* Remove GPIO chip */
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if (gpiochip_remove(&s->chip))
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dev_warn(&spi->dev, "Removing GPIO chip failed\n");
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/* Then do the default remove */
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return max3107_remove(spi);
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}
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/* Platform data */
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static struct max3107_plat aava_plat_data = {
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.loopback = 0,
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.ext_clk = 1,
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/* .init = max3107_aava_init, */
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.configure = max3107_aava_configure,
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.hw_suspend = max3107_hw_susp,
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.polled_mode = 0,
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.poll_time = 0,
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};
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static int __devinit max3107_probe_aava(struct spi_device *spi)
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{
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int err = max3107_aava_reset(spi);
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if (err < 0)
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return err;
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return max3107_probe(spi, &aava_plat_data);
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}
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/* Spi driver data */
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static struct spi_driver max3107_driver = {
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.driver = {
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.name = "aava-max3107",
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.bus = &spi_bus_type,
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.owner = THIS_MODULE,
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},
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.probe = max3107_probe_aava,
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.remove = __devexit_p(max3107_aava_remove),
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.suspend = max3107_suspend,
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.resume = max3107_resume,
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};
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/* Driver init function */
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static int __init max3107_init(void)
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{
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return spi_register_driver(&max3107_driver);
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}
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/* Driver exit function */
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static void __exit max3107_exit(void)
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{
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spi_unregister_driver(&max3107_driver);
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}
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module_init(max3107_init);
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module_exit(max3107_exit);
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MODULE_DESCRIPTION("MAX3107 driver");
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MODULE_AUTHOR("Aavamobile");
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MODULE_ALIAS("aava-max3107-spi");
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MODULE_LICENSE("GPL v2");
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