Commit 0c41839e authored by Srinidhi Kasagar's avatar Srinidhi Kasagar Committed by Samuel Ortiz
Browse files

mfd: add AB4500 driver 



This adds core driver support for AB4500 mixed signal
multimedia & power management chip. This connects to U8500
on the SSP (pl022) and exports read/write functions for
the device to get access to this chip. This also registers
the client devices and sets the parent.

Signed-off-by: default avatarsrinidhi kasagar <srinidhi.kasagar@stericsson.com>
Acked-by: default avatarAndrea Gallo <andrea.gallo@stericsson.com>
Reviewed-by: default avatarMark Brown <broonie@sirena.org.uk>
Reviewed-by: default avatarJean-Christophe <plagnioj@jcrosoft.com>
Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
parent 4107da2a

drivers/mfd/Kconfig

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@@ -329,6 +329,16 @@ config MFD_88PM8607 
	  individual components like voltage regulators, RTC and

	  battery-charger under the corresponding menus.



config AB4500_CORE

	tristate "ST-Ericsson's AB4500 Mixed Signal Power management chip"

	depends on SPI

	default y

	help

	  Select this option to enable access to AB4500 power management

	  chip. This connects to U8500 on the SSP/SPI bus and exports

	  read/write functions for the devices to get access to this chip.

	  This chip embeds various other multimedia funtionalities as well.



endmenu



menu "Multimedia Capabilities Port drivers"

drivers/mfd/Makefile

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@@ -52,4 +52,5 @@ obj-$(CONFIG_PCF50633_ADC) += pcf50633-adc.o 
obj-$(CONFIG_PCF50633_GPIO)	+= pcf50633-gpio.o

obj-$(CONFIG_AB3100_CORE)	+= ab3100-core.o

obj-$(CONFIG_AB3100_OTP)	+= ab3100-otp.o

obj-$(CONFIG_AB4500_CORE)	+= ab4500-core.o

obj-$(CONFIG_MFD_88PM8607)	+= 88pm8607.o

drivers/mfd/ab4500-core.c

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/*

 * Copyright (C) 2009 ST-Ericsson

 *

 * Author: Srinidhi KASAGAR <srinidhi.kasagar@stericsson.com>

 *

 * This program is free software; you can redistribute it

 * and/or modify it under the terms of the GNU General Public

 * License version 2, as published by the Free Software Foundation.

 *

 * AB4500 is a companion power management chip used with U8500.

 * On this platform, this is interfaced with SSP0 controller

 * which is a ARM primecell pl022.

 *

 * At the moment the module just exports read/write features.

 * Interrupt management to be added - TODO.

 */

#include <linux/kernel.h>

#include <linux/init.h>

#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/spi/spi.h>

#include <linux/mfd/ab4500.h>



/* just required if probe fails, we need to

 * unregister the device

 */

static struct spi_driver ab4500_driver;



/*

 * This funtion writes to any AB4500 registers using

 * SPI protocol &  before it writes it packs the data

 * in the below 24 bit frame format

 *

 *	 *|------------------------------------|

 *	 *| 23|22...18|17.......10|9|8|7......0|

 *	 *| r/w  bank       adr          data  |

 *	 * ------------------------------------

 *

 * This function shouldn't be called from interrupt

 * context

 */

int ab4500_write(struct ab4500 *ab4500, unsigned char block,

		unsigned long addr, unsigned char data)

{

	struct spi_transfer xfer;

	struct spi_message	msg;

	int err;

	unsigned long spi_data =

		block << 18 | addr << 10 | data;



	mutex_lock(&ab4500->lock);

	ab4500->tx_buf[0] = spi_data;

	ab4500->rx_buf[0] = 0;



	xfer.tx_buf	= ab4500->tx_buf;

	xfer.rx_buf 	= NULL;

	xfer.len	= sizeof(unsigned long);



	spi_message_init(&msg);

	spi_message_add_tail(&xfer, &msg);



	err = spi_sync(ab4500->spi, &msg);

	mutex_unlock(&ab4500->lock);



	return err;

}

EXPORT_SYMBOL(ab4500_write);



int ab4500_read(struct ab4500 *ab4500, unsigned char block,

		unsigned long addr)

{

	struct spi_transfer xfer;

	struct spi_message	msg;

	unsigned long spi_data =

		1 << 23 | block << 18 | addr << 10;



	mutex_lock(&ab4500->lock);

	ab4500->tx_buf[0] = spi_data;

	ab4500->rx_buf[0] = 0;



	xfer.tx_buf	= ab4500->tx_buf;

	xfer.rx_buf 	= ab4500->rx_buf;

	xfer.len	= sizeof(unsigned long);



	spi_message_init(&msg);

	spi_message_add_tail(&xfer, &msg);



	spi_sync(ab4500->spi, &msg);

	mutex_unlock(&ab4500->lock);



	return  ab4500->rx_buf[0];

}

EXPORT_SYMBOL(ab4500_read);



/* ref: ab3100 core */

#define AB4500_DEVICE(devname, devid)				\

static struct platform_device ab4500_##devname##_device = {	\

	.name	= devid,					\

	.id	= -1,						\

}



/* list of childern devices of ab4500 - all are

 * not populated here - TODO

 */

AB4500_DEVICE(charger, "ab4500-charger");

AB4500_DEVICE(audio, "ab4500-audio");

AB4500_DEVICE(usb, "ab4500-usb");

AB4500_DEVICE(tvout, "ab4500-tvout");

AB4500_DEVICE(sim, "ab4500-sim");

AB4500_DEVICE(gpadc, "ab4500-gpadc");

AB4500_DEVICE(clkmgt, "ab4500-clkmgt");

AB4500_DEVICE(misc, "ab4500-misc");



static struct platform_device *ab4500_platform_devs[] = {

	&ab4500_charger_device,

	&ab4500_audio_device,

	&ab4500_usb_device,

	&ab4500_tvout_device,

	&ab4500_sim_device,

	&ab4500_gpadc_device,

	&ab4500_clkmgt_device,

	&ab4500_misc_device,

};



static int __init ab4500_probe(struct spi_device *spi)

{

	struct ab4500	*ab4500;

	unsigned char revision;

	int err = 0;

	int i;



	ab4500 = kzalloc(sizeof *ab4500, GFP_KERNEL);

	if (!ab4500) {

		dev_err(&spi->dev, "could not allocate AB4500\n");

		err = -ENOMEM;

		goto not_detect;

	}



	ab4500->spi = spi;

	spi_set_drvdata(spi, ab4500);



	mutex_init(&ab4500->lock);



	/* read the revision register */

	revision = ab4500_read(ab4500, AB4500_MISC, AB4500_REV_REG);



	/* revision id 0x0 is for early drop, 0x10 is for cut1.0 */

	if (revision == 0x0 || revision == 0x10)

		dev_info(&spi->dev, "Detected chip: %s, revision = %x\n",

			ab4500_driver.driver.name, revision);

	else	{

		dev_err(&spi->dev, "unknown chip: 0x%x\n", revision);

		goto not_detect;

	}



	for (i = 0; i < ARRAY_SIZE(ab4500_platform_devs); i++)	{

		ab4500_platform_devs[i]->dev.parent =

			&spi->dev;

		platform_set_drvdata(ab4500_platform_devs[i], ab4500);

	}



	/* register the ab4500 platform devices */

	platform_add_devices(ab4500_platform_devs,

			ARRAY_SIZE(ab4500_platform_devs));



	return err;



 not_detect:

	spi_unregister_driver(&ab4500_driver);

	kfree(ab4500);

	return err;

}



static int __devexit ab4500_remove(struct spi_device *spi)

{

	struct ab4500 *ab4500 =

		spi_get_drvdata(spi);



	kfree(ab4500);



	return 0;

}



static struct spi_driver ab4500_driver = {

	.driver = {

		.name = "ab4500",

		.owner = THIS_MODULE,

	},

	.probe = ab4500_probe,

	.remove = __devexit_p(ab4500_remove)

};



static int __devinit ab4500_init(void)

{

	return spi_register_driver(&ab4500_driver);

}



static void __exit ab4500_exit(void)

{

	spi_unregister_driver(&ab4500_driver);

}



subsys_initcall_sync(ab4500_init);



MODULE_AUTHOR("Srinidhi KASAGAR <srinidhi.kasagar@stericsson.com");

MODULE_DESCRIPTION("AB4500 core driver");

MODULE_LICENSE("GPL");

include/linux/mfd/ab4500.h

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/*

 * Copyright (C) 2009 ST-Ericsson

 *

 * Author: Srinidhi KASAGAR <srinidhi.kasagar@stericsson.com>

 *

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

 * it under the terms of the GNU General Public License version 2, as

 * published by the Free Software Foundation.

 *

 * AB4500 device core funtions, for client access

 */

#ifndef MFD_AB4500_H

#define MFD_AB4500_H



#include <linux/device.h>



/*

 * AB4500 bank addresses

 */

#define AB4500_SYS_CTRL1_BLOCK	0x1

#define AB4500_SYS_CTRL2_BLOCK	0x2

#define AB4500_REGU_CTRL1	0x3

#define AB4500_REGU_CTRL2	0x4

#define AB4500_USB		0x5

#define AB4500_TVOUT		0x6

#define AB4500_DBI		0x7

#define AB4500_ECI_AV_ACC	0x8

#define AB4500_RESERVED		0x9

#define AB4500_GPADC		0xA

#define AB4500_CHARGER		0xB

#define AB4500_GAS_GAUGE	0xC

#define AB4500_AUDIO		0xD

#define AB4500_INTERRUPT	0xE

#define AB4500_RTC		0xF

#define AB4500_MISC		0x10

#define AB4500_DEBUG		0x12

#define AB4500_PROD_TEST	0x13

#define AB4500_OTP_EMUL		0x15



/*

 * System control 1 register offsets.

 * Bank = 0x01

 */

#define AB4500_TURNON_STAT_REG		0x0100

#define AB4500_RESET_STAT_REG		0x0101

#define AB4500_PONKEY1_PRESS_STAT_REG	0x0102



#define AB4500_FSM_STAT1_REG		0x0140

#define AB4500_FSM_STAT2_REG		0x0141

#define AB4500_SYSCLK_REQ_STAT_REG	0x0142

#define AB4500_USB_STAT1_REG		0x0143

#define AB4500_USB_STAT2_REG		0x0144

#define AB4500_STATUS_SPARE1_REG	0x0145

#define AB4500_STATUS_SPARE2_REG	0x0146



#define AB4500_CTRL1_REG		0x0180

#define AB4500_CTRL2_REG		0x0181



/*

 * System control 2 register offsets.

 * bank = 0x02

 */

#define AB4500_CTRL3_REG		0x0200

#define AB4500_MAIN_WDOG_CTRL_REG	0x0201

#define AB4500_MAIN_WDOG_TIMER_REG	0x0202

#define AB4500_LOW_BAT_REG		0x0203

#define AB4500_BATT_OK_REG		0x0204

#define AB4500_SYSCLK_TIMER_REG		0x0205

#define AB4500_SMPSCLK_CTRL_REG		0x0206

#define AB4500_SMPSCLK_SEL1_REG		0x0207

#define AB4500_SMPSCLK_SEL2_REG		0x0208

#define AB4500_SMPSCLK_SEL3_REG		0x0209

#define AB4500_SYSULPCLK_CONF_REG	0x020A

#define AB4500_SYSULPCLK_CTRL1_REG	0x020B

#define AB4500_SYSCLK_CTRL_REG		0x020C

#define AB4500_SYSCLK_REQ1_VALID_REG	0x020D

#define AB4500_SYSCLK_REQ_VALID_REG	0x020E

#define AB4500_SYSCTRL_SPARE_REG	0x020F

#define AB4500_PAD_CONF_REG		0x0210



/*

 * Regu control1 register offsets

 * Bank = 0x03

 */

#define AB4500_REGU_SERIAL_CTRL1_REG	0x0300

#define AB4500_REGU_SERIAL_CTRL2_REG	0x0301

#define AB4500_REGU_SERIAL_CTRL3_REG	0x0302

#define AB4500_REGU_REQ_CTRL1_REG	0x0303

#define AB4500_REGU_REQ_CTRL2_REG	0x0304

#define AB4500_REGU_REQ_CTRL3_REG	0x0305

#define AB4500_REGU_REQ_CTRL4_REG	0x0306

#define AB4500_REGU_MISC1_REG		0x0380

#define AB4500_REGU_OTGSUPPLY_CTRL_REG	0x0381

#define AB4500_REGU_VUSB_CTRL_REG	0x0382

#define AB4500_REGU_VAUDIO_SUPPLY_REG	0x0383

#define AB4500_REGU_CTRL1_SPARE_REG	0x0384



/*

 * Regu control2 Vmod register offsets

 */

#define AB4500_REGU_VMOD_REGU_REG	0x0440

#define AB4500_REGU_VMOD_SEL1_REG	0x0441

#define AB4500_REGU_VMOD_SEL2_REG	0x0442

#define AB4500_REGU_CTRL_DISCH_REG	0x0443

#define AB4500_REGU_CTRL_DISCH2_REG	0x0444



/*

 * USB/ULPI register offsets

 * Bank : 0x5

 */

#define AB4500_USB_LINE_STAT_REG	0x0580

#define AB4500_USB_LINE_CTRL1_REG	0x0581

#define AB4500_USB_LINE_CTRL2_REG	0x0582

#define AB4500_USB_LINE_CTRL3_REG	0x0583

#define AB4500_USB_LINE_CTRL4_REG	0x0584

#define AB4500_USB_LINE_CTRL5_REG	0x0585

#define AB4500_USB_OTG_CTRL_REG		0x0587

#define AB4500_USB_OTG_STAT_REG		0x0588

#define AB4500_USB_OTG_STAT_REG		0x0588

#define AB4500_USB_CTRL_SPARE_REG	0x0589

#define AB4500_USB_PHY_CTRL_REG		0x058A



/*

 * TVOUT / CTRL register offsets

 * Bank : 0x06

 */

#define AB4500_TVOUT_CTRL_REG		0x0680



/*

 * DBI register offsets

 * Bank : 0x07

 */

#define AB4500_DBI_REG1_REG		0x0700

#define AB4500_DBI_REG2_REG		0x0701



/*

 * ECI regsiter offsets

 * Bank : 0x08

 */

#define AB4500_ECI_CTRL_REG		0x0800

#define AB4500_ECI_HOOKLEVEL_REG	0x0801

#define AB4500_ECI_DATAOUT_REG		0x0802

#define AB4500_ECI_DATAIN_REG		0x0803



/*

 * AV Connector register offsets

 * Bank : 0x08

 */

#define AB4500_AV_CONN_REG		0x0840



/*

 * Accessory detection register offsets

 * Bank : 0x08

 */

#define AB4500_ACC_DET_DB1_REG		0x0880

#define AB4500_ACC_DET_DB2_REG		0x0881



/*

 * GPADC register offsets

 * Bank : 0x0A

 */

#define AB4500_GPADC_CTRL1_REG		0x0A00

#define AB4500_GPADC_CTRL2_REG		0x0A01

#define AB4500_GPADC_CTRL3_REG		0x0A02

#define AB4500_GPADC_AUTO_TIMER_REG	0x0A03

#define AB4500_GPADC_STAT_REG		0x0A04

#define AB4500_GPADC_MANDATAL_REG	0x0A05

#define AB4500_GPADC_MANDATAH_REG	0x0A06

#define AB4500_GPADC_AUTODATAL_REG	0x0A07

#define AB4500_GPADC_AUTODATAH_REG	0x0A08

#define AB4500_GPADC_MUX_CTRL_REG	0x0A09



/*

 * Charger / status register offfsets

 * Bank : 0x0B

 */

#define AB4500_CH_STATUS1_REG		0x0B00

#define AB4500_CH_STATUS2_REG		0x0B01

#define AB4500_CH_USBCH_STAT1_REG	0x0B02

#define AB4500_CH_USBCH_STAT2_REG	0x0B03

#define AB4500_CH_FSM_STAT_REG		0x0B04

#define AB4500_CH_STAT_REG		0x0B05



/*

 * Charger / control register offfsets

 * Bank : 0x0B

 */

#define AB4500_CH_VOLT_LVL_REG		0x0B40



/*

 * Charger / main control register offfsets

 * Bank : 0x0B

 */

#define AB4500_MCH_CTRL1		0x0B80

#define AB4500_MCH_CTRL2		0x0B81

#define AB4500_MCH_IPT_CURLVL_REG	0x0B82

#define AB4500_CH_WD_REG		0x0B83



/*

 * Charger / USB control register offsets

 * Bank : 0x0B

 */

#define AB4500_USBCH_CTRL1_REG		0x0BC0

#define AB4500_USBCH_CTRL2_REG		0x0BC1

#define AB4500_USBCH_IPT_CRNTLVL_REG	0x0BC2



/*

 * RTC bank register offsets

 * Bank : 0xF

 */

#define AB4500_RTC_SOFF_STAT_REG	0x0F00

#define AB4500_RTC_CC_CONF_REG		0x0F01

#define AB4500_RTC_READ_REQ_REG		0x0F02

#define AB4500_RTC_WATCH_TSECMID_REG	0x0F03

#define AB4500_RTC_WATCH_TSECHI_REG	0x0F04

#define AB4500_RTC_WATCH_TMIN_LOW_REG	0x0F05

#define AB4500_RTC_WATCH_TMIN_MID_REG	0x0F06

#define AB4500_RTC_WATCH_TMIN_HI_REG	0x0F07

#define AB4500_RTC_ALRM_MIN_LOW_REG	0x0F08

#define AB4500_RTC_ALRM_MIN_MID_REG	0x0F09

#define AB4500_RTC_ALRM_MIN_HI_REG	0x0F0A

#define AB4500_RTC_STAT_REG		0x0F0B

#define AB4500_RTC_BKUP_CHG_REG		0x0F0C

#define AB4500_RTC_FORCE_BKUP_REG	0x0F0D

#define AB4500_RTC_CALIB_REG		0x0F0E

#define AB4500_RTC_SWITCH_STAT_REG	0x0F0F



/*

 * PWM Out generators

 * Bank: 0x10

 */

#define AB4500_PWM_OUT_CTRL1_REG	0x1060

#define AB4500_PWM_OUT_CTRL2_REG	0x1061

#define AB4500_PWM_OUT_CTRL3_REG	0x1062

#define AB4500_PWM_OUT_CTRL4_REG	0x1063

#define AB4500_PWM_OUT_CTRL5_REG	0x1064

#define AB4500_PWM_OUT_CTRL6_REG	0x1065

#define AB4500_PWM_OUT_CTRL7_REG	0x1066



#define AB4500_I2C_PAD_CTRL_REG		0x1067

#define AB4500_REV_REG			0x1080



/**

 * struct ab4500

 * @spi: spi device structure

 * @tx_buf: transmit buffer

 * @rx_buf: receive buffer

 * @lock: sync primitive

 */

struct ab4500 {

	struct spi_device	*spi;

	unsigned long		tx_buf[4];

	unsigned long		rx_buf[4];

	struct mutex		lock;

};



int ab4500_write(struct ab4500 *ab4500, unsigned char block,

		unsigned long addr, unsigned char data);

int ab4500_read(struct ab4500 *ab4500, unsigned char block,

		unsigned long addr);



#endif /* MFD_AB4500_H */

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