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Commit 61fd1526 authored by Alan Cox's avatar Alan Cox Committed by Greg Kroah-Hartman
Browse files

serial: max3107: Abstract out the platform specific bits 



At the moment there is only one platform type supported and there is is
hard wired, but with these changes the infrastructure is now there for
anyone else to provide methods for their hardware.

Signed-off-by: default avatarAlan Cox <alan@linux.intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 44318feb

drivers/serial/Kconfig

+15 −6
Original line number Diff line number Diff line
@@ -542,20 +542,29 @@ config SERIAL_S5PV210 
	help

	  Serial port support for Samsung's S5P Family of SoC's





config SERIAL_MAX3100

	tristate "MAX3100 support"

	depends on SPI

	select SERIAL_CORE

	help

	  MAX3100 chip support



config SERIAL_MAX3107

	tristate "MAX3107 support"

	depends on SPI && GPIOLIB

	depends on SPI

	select SERIAL_CORE

	default y

	help

	  MAX3107 chip support



config SERIAL_MAX3100

	tristate "MAX3100 support"

	depends on SPI

config SERIAL_MAX3107_AAVA

	tristate "MAX3107 AAVA platform support"

	depends on X86_MRST && SERIAL_MAX3107 && GPIOLIB

	select SERIAL_CORE

	help

	  MAX3100 chip support

	  Support for the MAX3107 chip configuration found on the AAVA

	  platform. Includes the extra initialisation and GPIO support

	  neded for this device.



config SERIAL_DZ

	bool "DECstation DZ serial driver"

drivers/serial/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -47,6 +47,7 @@ obj-$(CONFIG_SERIAL_S3C6400) += s3c6400.o 
obj-$(CONFIG_SERIAL_S5PV210) += s5pv210.o

obj-$(CONFIG_SERIAL_MAX3100) += max3100.o

obj-$(CONFIG_SERIAL_MAX3107) += max3107.o

obj-$(CONFIG_SERIAL_MAX3107_AAVA) += max3107-aava.o

obj-$(CONFIG_SERIAL_IP22_ZILOG) += ip22zilog.o

obj-$(CONFIG_SERIAL_MUX) += mux.o

obj-$(CONFIG_SERIAL_68328) += 68328serial.o

drivers/serial/max3107-aava.c

0 → 100644
+344 −0
Original line number Diff line number Diff line 
/*

 *  max3107.c - spi uart protocol driver for Maxim 3107

 *  Based on max3100.c

 *	by Christian Pellegrin <chripell@evolware.org>

 *  and	max3110.c

 *	by Feng Tang <feng.tang@intel.com>

 *

 *  Copyright (C) Aavamobile 2009

 *

 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

 *

 *  This program is free software; you can redistribute it and/or modify

 *  it under the terms of the GNU General Public License as published by

 *  the Free Software Foundation; either version 2 of the License, or

 *  (at your option) any later version.

 *

 *  This program is distributed in the hope that it will be useful,

 *  but WITHOUT ANY WARRANTY; without even the implied warranty of

 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 *  GNU General Public License for more details.

 *

 *  You should have received a copy of the GNU General Public License

 *  along with this program; if not, write to the Free Software

 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 *

 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

 *

 */



#include <linux/delay.h>

#include <linux/device.h>

#include <linux/serial_core.h>

#include <linux/serial.h>

#include <linux/spi/spi.h>

#include <linux/freezer.h>

#include <linux/platform_device.h>

#include <linux/gpio.h>

#include <linux/sfi.h>

#include <asm/mrst.h>

#include "max3107.h"



/* GPIO direction to input function */

static int max3107_gpio_direction_in(struct gpio_chip *chip, unsigned offset)

{

	struct max3107_port *s = container_of(chip, struct max3107_port, chip);

	u16 buf[1];		/* Buffer for SPI transfer */



	if (offset >= MAX3107_GPIO_COUNT) {

		dev_err(&s->spi->dev, "Invalid GPIO\n");

		return -EINVAL;

	}



	/* Read current GPIO configuration register */

	buf[0] = MAX3107_GPIOCFG_REG;

	/* Perform SPI transfer */

	if (max3107_rw(s, (u8 *)buf, (u8 *)buf, 2)) {

		dev_err(&s->spi->dev, "SPI transfer GPIO read failed\n");

		return -EIO;

	}

	buf[0] &= MAX3107_SPI_RX_DATA_MASK;



	/* Set GPIO to input */

	buf[0] &= ~(0x0001 << offset);



	/* Write new GPIO configuration register value */

	buf[0] |= (MAX3107_WRITE_BIT | MAX3107_GPIOCFG_REG);

	/* Perform SPI transfer */

	if (max3107_rw(s, (u8 *)buf, NULL, 2)) {

		dev_err(&s->spi->dev, "SPI transfer GPIO write failed\n");

		return -EIO;

	}

	return 0;

}



/* GPIO direction to output function */

static int max3107_gpio_direction_out(struct gpio_chip *chip, unsigned offset,

					int value)

{

	struct max3107_port *s = container_of(chip, struct max3107_port, chip);

	u16 buf[2];	/* Buffer for SPI transfers */



	if (offset >= MAX3107_GPIO_COUNT) {

		dev_err(&s->spi->dev, "Invalid GPIO\n");

		return -EINVAL;

	}



	/* Read current GPIO configuration and data registers */

	buf[0] = MAX3107_GPIOCFG_REG;

	buf[1] = MAX3107_GPIODATA_REG;

	/* Perform SPI transfer */

	if (max3107_rw(s, (u8 *)buf, (u8 *)buf, 4)) {

		dev_err(&s->spi->dev, "SPI transfer gpio failed\n");

		return -EIO;

	}

	buf[0] &= MAX3107_SPI_RX_DATA_MASK;

	buf[1] &= MAX3107_SPI_RX_DATA_MASK;



	/* Set GPIO to output */

	buf[0] |= (0x0001 << offset);

	/* Set value */

	if (value)

		buf[1] |= (0x0001 << offset);

	else

		buf[1] &= ~(0x0001 << offset);



	/* Write new GPIO configuration and data register values */

	buf[0] |= (MAX3107_WRITE_BIT | MAX3107_GPIOCFG_REG);

	buf[1] |= (MAX3107_WRITE_BIT | MAX3107_GPIODATA_REG);

	/* Perform SPI transfer */

	if (max3107_rw(s, (u8 *)buf, NULL, 4)) {

		dev_err(&s->spi->dev,

			"SPI transfer for GPIO conf data w failed\n");

		return -EIO;

	}

	return 0;

}



/* GPIO value query function */

static int max3107_gpio_get(struct gpio_chip *chip, unsigned offset)

{

	struct max3107_port *s = container_of(chip, struct max3107_port, chip);

	u16 buf[1];	/* Buffer for SPI transfer */



	if (offset >= MAX3107_GPIO_COUNT) {

		dev_err(&s->spi->dev, "Invalid GPIO\n");

		return -EINVAL;

	}



	/* Read current GPIO data register */

	buf[0] = MAX3107_GPIODATA_REG;

	/* Perform SPI transfer */

	if (max3107_rw(s, (u8 *)buf, (u8 *)buf, 2)) {

		dev_err(&s->spi->dev, "SPI transfer GPIO data r failed\n");

		return -EIO;

	}

	buf[0] &= MAX3107_SPI_RX_DATA_MASK;



	/* Return value */

	return buf[0] & (0x0001 << offset);

}



/* GPIO value set function */

static void max3107_gpio_set(struct gpio_chip *chip, unsigned offset, int value)

{

	struct max3107_port *s = container_of(chip, struct max3107_port, chip);

	u16 buf[2];	/* Buffer for SPI transfers */



	if (offset >= MAX3107_GPIO_COUNT) {

		dev_err(&s->spi->dev, "Invalid GPIO\n");

		return;

	}



	/* Read current GPIO configuration registers*/

	buf[0] = MAX3107_GPIODATA_REG;

	buf[1] = MAX3107_GPIOCFG_REG;

	/* Perform SPI transfer */

	if (max3107_rw(s, (u8 *)buf, (u8 *)buf, 4)) {

		dev_err(&s->spi->dev,

			"SPI transfer for GPIO data and config read failed\n");

		return;

	}

	buf[0] &= MAX3107_SPI_RX_DATA_MASK;

	buf[1] &= MAX3107_SPI_RX_DATA_MASK;



	if (!(buf[1] & (0x0001 << offset))) {

		/* Configured as input, can't set value */

		dev_warn(&s->spi->dev,

				"Trying to set value for input GPIO\n");

		return;

	}



	/* Set value */

	if (value)

		buf[0] |= (0x0001 << offset);

	else

		buf[0] &= ~(0x0001 << offset);



	/* Write new GPIO data register value */

	buf[0] |= (MAX3107_WRITE_BIT | MAX3107_GPIODATA_REG);

	/* Perform SPI transfer */

	if (max3107_rw(s, (u8 *)buf, NULL, 2))

		dev_err(&s->spi->dev, "SPI transfer GPIO data w failed\n");

}



/* GPIO chip data */

static struct gpio_chip max3107_gpio_chip = {

	.owner			= THIS_MODULE,

	.direction_input	= max3107_gpio_direction_in,

	.direction_output	= max3107_gpio_direction_out,

	.get			= max3107_gpio_get,

	.set			= max3107_gpio_set,

	.can_sleep		= 1,

	.base			= MAX3107_GPIO_BASE,

	.ngpio			= MAX3107_GPIO_COUNT,

};



/**

 *	max3107_aava_reset	-	reset on AAVA systems

 *	@spi: The SPI device we are probing

 *

 *	Reset the device ready for probing.

 */



static int max3107_aava_reset(struct spi_device *spi)

{

	/* Reset the chip */

	if (gpio_request(MAX3107_RESET_GPIO, "max3107")) {

		pr_err("Requesting RESET GPIO failed\n");

		return -EIO;

	}

	if (gpio_direction_output(MAX3107_RESET_GPIO, 0)) {

		pr_err("Setting RESET GPIO to 0 failed\n");

		gpio_free(MAX3107_RESET_GPIO);

		return -EIO;

	}

	msleep(MAX3107_RESET_DELAY);

	if (gpio_direction_output(MAX3107_RESET_GPIO, 1)) {

		pr_err("Setting RESET GPIO to 1 failed\n");

		gpio_free(MAX3107_RESET_GPIO);

		return -EIO;

	}

	gpio_free(MAX3107_RESET_GPIO);

	msleep(MAX3107_WAKEUP_DELAY);

	return 0;

}



static int max3107_aava_configure(struct max3107_port *s)

{

	int retval;



	/* Initialize GPIO chip data */

	s->chip = max3107_gpio_chip;

	s->chip.label = s->spi->modalias;

	s->chip.dev = &s->spi->dev;



	/* Add GPIO chip */

	retval = gpiochip_add(&s->chip);

	if (retval) {

		dev_err(&s->spi->dev, "Adding GPIO chip failed\n");

		return retval;

	}



	/* Temporary fix for EV2 boot problems, set modem reset to 0 */

	max3107_gpio_direction_out(&s->chip, 3, 0);

	return 0;

}



#if 0

/* This will get enabled once we have the board stuff merged for this

   specific case */



static const struct baud_table brg13_ext[] = {

	{ 300,    MAX3107_BRG13_B300 },

	{ 600,    MAX3107_BRG13_B600 },

	{ 1200,   MAX3107_BRG13_B1200 },

	{ 2400,   MAX3107_BRG13_B2400 },

	{ 4800,   MAX3107_BRG13_B4800 },

	{ 9600,   MAX3107_BRG13_B9600 },

	{ 19200,  MAX3107_BRG13_B19200 },

	{ 57600,  MAX3107_BRG13_B57600 },

	{ 115200, MAX3107_BRG13_B115200 },

	{ 230400, MAX3107_BRG13_B230400 },

	{ 460800, MAX3107_BRG13_B460800 },

	{ 921600, MAX3107_BRG13_B921600 },

	{ 0, 0 }

};



static void max3107_aava_init(struct max3107_port *s)

{

	/*override for AAVA SC specific*/

	if (mrst_platform_id() == MRST_PLATFORM_AAVA_SC) {

		if (get_koski_build_id() <= KOSKI_EV2)

			if (s->ext_clk) {

				s->brg_cfg = MAX3107_BRG13_B9600;

				s->baud_tbl = (struct baud_table *)brg13_ext;

			}

	}

}

#endif



static int __devexit max3107_aava_remove(struct spi_device *spi)

{

	struct max3107_port *s = dev_get_drvdata(&spi->dev);



	/* Remove GPIO chip */

	if (gpiochip_remove(&s->chip))

		dev_warn(&spi->dev, "Removing GPIO chip failed\n");



	/* Then do the default remove */

	return max3107_remove(spi);

}



/* Platform data */

static struct max3107_plat aava_plat_data = {

	.loopback               = 0,

	.ext_clk                = 1,

/*	.init			= max3107_aava_init, */

	.configure		= max3107_aava_configure,

	.hw_suspend		= max3107_hw_susp,

	.polled_mode            = 0,

	.poll_time              = 0,

};





static int __devinit max3107_probe_aava(struct spi_device *spi)

{

	int err = max3107_aava_reset(spi);

	if (err < 0)

		return err;

	return max3107_probe(spi, &aava_plat_data);

}



/* Spi driver data */

static struct spi_driver max3107_driver = {

	.driver = {

		.name		= "aava-max3107",

		.bus		= &spi_bus_type,

		.owner		= THIS_MODULE,

	},

	.probe		= max3107_probe_aava,

	.remove		= __devexit_p(max3107_aava_remove),

	.suspend	= max3107_suspend,

	.resume		= max3107_resume,

};



/* Driver init function */

static int __init max3107_init(void)

{

	return spi_register_driver(&max3107_driver);

}



/* Driver exit function */

static void __exit max3107_exit(void)

{

	spi_unregister_driver(&max3107_driver);

}



module_init(max3107_init);

module_exit(max3107_exit);



MODULE_DESCRIPTION("MAX3107 driver");

MODULE_AUTHOR("Aavamobile");

MODULE_ALIAS("aava-max3107-spi");

MODULE_LICENSE("GPL v2");

drivers/serial/max3107.c

+84 −329

File changed.

Preview size limit exceeded, changes collapsed.

drivers/serial/max3107.h

+83 −2
Original line number Diff line number Diff line
@@ -10,8 +10,8 @@ 
 * (at your option) any later version.

 */



#ifndef _LINUX_SERIAL_MAX3107_H

#define _LINUX_SERIAL_MAX3107_H

#ifndef _MAX3107_H

#define _MAX3107_H



/* Serial error status definitions */

#define MAX3107_PARITY_ERROR	1
@@ -355,4 +355,85 @@ 
#define MAX3107_BRG13_IB460800	(0x000000 | 0x00)

#define MAX3107_BRG13_IB921600	(0x000000 | 0x00)





struct baud_table {

	int baud;

	u32 new_brg;

};



struct max3107_port {

	/* UART port structure */

	struct uart_port port;



	/* SPI device structure */

	struct spi_device *spi;



	/* GPIO chip stucture */

	struct gpio_chip chip;



	/* Workqueue that does all the magic */

	struct workqueue_struct *workqueue;

	struct work_struct work;



	/* Lock for shared data */

	spinlock_t data_lock;



	/* Device configuration */

	int ext_clk;		/* 1 if external clock used */

	int loopback;		/* Current loopback mode state */

	int baud;			/* Current baud rate */



	/* State flags */

	int suspended;		/* Indicates suspend mode */

	int tx_fifo_empty;	/* Flag for TX FIFO state */

	int rx_enabled;		/* Flag for receiver state */

	int tx_enabled;		/* Flag for transmitter state */



	u16 irqen_reg;		/* Current IRQ enable register value */

	/* Shared data */

	u16 mode1_reg;		/* Current mode1 register value*/

	int mode1_commit;	/* Flag for setting new mode1 register value */

	u16 lcr_reg;		/* Current LCR register value */

	int lcr_commit;		/* Flag for setting new LCR register value */

	u32 brg_cfg;		/* Current Baud rate generator config  */

	int brg_commit;		/* Flag for setting new baud rate generator

				 * config

				 */

	struct baud_table *baud_tbl;

	int handle_irq;		/* Indicates that IRQ should be handled */



	/* Rx buffer and str*/

	u16 *rxbuf;

	u8  *rxstr;

	/* Tx buffer*/

	u16 *txbuf;



	struct max3107_plat *pdata;	/* Platform data */

};



/* Platform data structure */

struct max3107_plat {

	/* Loopback mode enable */

	int loopback;

	/* External clock enable */

	int ext_clk;

	/* Called during the register initialisation */

	void (*init)(struct max3107_port *s);

	/* Called when the port is found and configured */

	int (*configure)(struct max3107_port *s);

	/* HW suspend function */

	void (*hw_suspend) (struct max3107_port *s, int suspend);

	/* Polling mode enable */

	int polled_mode;

	/* Polling period if polling mode enabled */

	int poll_time;

};



extern int max3107_rw(struct max3107_port *s, u8 *tx, u8 *rx, int len);

extern void max3107_hw_susp(struct max3107_port *s, int suspend);

extern int max3107_probe(struct spi_device *spi, struct max3107_plat *pdata);

extern int max3107_remove(struct spi_device *spi);

extern int max3107_suspend(struct spi_device *spi, pm_message_t state);

extern int max3107_resume(struct spi_device *spi);



#endif /* _LINUX_SERIAL_MAX3107_H */