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Commit 8fe8bc77 authored by Wolfram Sang's avatar Wolfram Sang
Browse files

i2c: s6000: remove duplicate driver 



It turned out that the s6000 simply has a designware IP core and should
use the designated driver for it which is way more maintained and
feature complete. There are currently no users in tree, and not even a
toolchain for s6000 seems to be available. So, simply remove this
duplicate. If someone needs assistance in converting to the designware
driver, the i2c list will be there to help.

Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
parent 2fd6cf05

drivers/i2c/busses/Kconfig

+0 −10
Original line number Diff line number Diff line
@@ -700,16 +700,6 @@ config I2C_S3C2410 
	  Say Y here to include support for I2C controller in the

	  Samsung SoCs.



config I2C_S6000

	tristate "S6000 I2C support"

	depends on XTENSA_VARIANT_S6000

	help

	  This driver supports the on chip I2C device on the

	  S6000 xtensa processor family.



	  To compile this driver as a module, choose M here. The module

	  will be called i2c-s6000.



config I2C_SH7760

	tristate "Renesas SH7760 I2C Controller"

	depends on CPU_SUBTYPE_SH7760

drivers/i2c/busses/Makefile

+0 −1
Original line number Diff line number Diff line
@@ -68,7 +68,6 @@ obj-$(CONFIG_I2C_QUP) += i2c-qup.o 
obj-$(CONFIG_I2C_RIIC)		+= i2c-riic.o

obj-$(CONFIG_I2C_RK3X)		+= i2c-rk3x.o

obj-$(CONFIG_I2C_S3C2410)	+= i2c-s3c2410.o

obj-$(CONFIG_I2C_S6000)		+= i2c-s6000.o

obj-$(CONFIG_I2C_SH7760)	+= i2c-sh7760.o

obj-$(CONFIG_I2C_SH_MOBILE)	+= i2c-sh_mobile.o

obj-$(CONFIG_I2C_SIMTEC)	+= i2c-simtec.o

drivers/i2c/busses/i2c-s6000.c

deleted100644 → 0
+0 −404
Original line number Diff line number Diff line 
/*

 * drivers/i2c/busses/i2c-s6000.c

 *

 * Description: Driver for S6000 Family I2C Interface

 * Copyright (c) 2008 emlix GmbH

 * Author:	Oskar Schirmer <oskar@scara.com>

 *

 * Partially based on i2c-bfin-twi.c driver by <sonic.zhang@analog.com>

 * Copyright (c) 2005-2007 Analog Devices, Inc.

 *

 * 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., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA

 */



#include <linux/clk.h>

#include <linux/err.h>

#include <linux/module.h>

#include <linux/kernel.h>

#include <linux/init.h>

#include <linux/delay.h>

#include <linux/i2c.h>

#include <linux/i2c/s6000.h>

#include <linux/timer.h>

#include <linux/spinlock.h>

#include <linux/completion.h>

#include <linux/interrupt.h>

#include <linux/platform_device.h>

#include <linux/io.h>



#include "i2c-s6000.h"



#define DRV_NAME "i2c-s6000"



#define POLL_TIMEOUT	(2 * HZ)



struct s6i2c_if {

	u8 __iomem		*reg; /* memory mapped registers */

	int			irq;

	spinlock_t		lock;

	struct i2c_msg		*msgs; /* messages currently handled */

	int			msgs_num; /* nb of msgs to do */

	int			msgs_push; /* nb of msgs read/written */

	int			msgs_done; /* nb of msgs finally handled */

	unsigned		push; /* nb of bytes read/written in msg */

	unsigned		done; /* nb of bytes finally handled */

	int			timeout_count; /* timeout retries left */

	struct timer_list	timeout_timer;

	struct i2c_adapter	adap;

	struct completion	complete;

	struct clk		*clk;

	struct resource		*res;

};



static inline u16 i2c_rd16(struct s6i2c_if *iface, unsigned n)

{

	return readw(iface->reg + (n));

}



static inline void i2c_wr16(struct s6i2c_if *iface, unsigned n, u16 v)

{

	writew(v, iface->reg + (n));

}



static inline u32 i2c_rd32(struct s6i2c_if *iface, unsigned n)

{

	return readl(iface->reg + (n));

}



static inline void i2c_wr32(struct s6i2c_if *iface, unsigned n, u32 v)

{

	writel(v, iface->reg + (n));

}



static struct s6i2c_if s6i2c_if;



static void s6i2c_handle_interrupt(struct s6i2c_if *iface)

{

	if (i2c_rd16(iface, S6_I2C_INTRSTAT) & (1 << S6_I2C_INTR_TXABRT)) {

		i2c_rd16(iface, S6_I2C_CLRTXABRT);

		i2c_wr16(iface, S6_I2C_INTRMASK, 0);

		complete(&iface->complete);

		return;

	}

	if (iface->msgs_done >= iface->msgs_num) {

		dev_err(&iface->adap.dev, "s6i2c: spurious I2C irq: %04x\n",

			i2c_rd16(iface, S6_I2C_INTRSTAT));

		i2c_wr16(iface, S6_I2C_INTRMASK, 0);

		return;

	}

	while ((iface->msgs_push < iface->msgs_num)

	    && (i2c_rd16(iface, S6_I2C_STATUS) & (1 << S6_I2C_STATUS_TFNF))) {

		struct i2c_msg *m = &iface->msgs[iface->msgs_push];

		if (!(m->flags & I2C_M_RD))

			i2c_wr16(iface, S6_I2C_DATACMD, m->buf[iface->push]);

		else

			i2c_wr16(iface, S6_I2C_DATACMD,

				 1 << S6_I2C_DATACMD_READ);

		if (++iface->push >= m->len) {

			iface->push = 0;

			iface->msgs_push += 1;

		}

	}

	do {

		struct i2c_msg *m = &iface->msgs[iface->msgs_done];

		if (!(m->flags & I2C_M_RD)) {

			if (iface->msgs_done < iface->msgs_push)

				iface->msgs_done += 1;

			else

				break;

		} else if (i2c_rd16(iface, S6_I2C_STATUS)

				& (1 << S6_I2C_STATUS_RFNE)) {

			m->buf[iface->done] = i2c_rd16(iface, S6_I2C_DATACMD);

			if (++iface->done >= m->len) {

				iface->done = 0;

				iface->msgs_done += 1;

			}

		} else{

			break;

		}

	} while (iface->msgs_done < iface->msgs_num);

	if (iface->msgs_done >= iface->msgs_num) {

		i2c_wr16(iface, S6_I2C_INTRMASK, 1 << S6_I2C_INTR_TXABRT);

		complete(&iface->complete);

	} else if (iface->msgs_push >= iface->msgs_num) {

		i2c_wr16(iface, S6_I2C_INTRMASK, (1 << S6_I2C_INTR_TXABRT) |

						 (1 << S6_I2C_INTR_RXFULL));

	} else {

		i2c_wr16(iface, S6_I2C_INTRMASK, (1 << S6_I2C_INTR_TXABRT) |

						 (1 << S6_I2C_INTR_TXEMPTY) |

						 (1 << S6_I2C_INTR_RXFULL));

	}

}



static irqreturn_t s6i2c_interrupt_entry(int irq, void *dev_id)

{

	struct s6i2c_if *iface = dev_id;

	if (!(i2c_rd16(iface, S6_I2C_STATUS) & ((1 << S6_I2C_INTR_RXUNDER)

					      | (1 << S6_I2C_INTR_RXOVER)

					      | (1 << S6_I2C_INTR_RXFULL)

					      | (1 << S6_I2C_INTR_TXOVER)

					      | (1 << S6_I2C_INTR_TXEMPTY)

					      | (1 << S6_I2C_INTR_RDREQ)

					      | (1 << S6_I2C_INTR_TXABRT)

					      | (1 << S6_I2C_INTR_RXDONE)

					      | (1 << S6_I2C_INTR_ACTIVITY)

					      | (1 << S6_I2C_INTR_STOPDET)

					      | (1 << S6_I2C_INTR_STARTDET)

					      | (1 << S6_I2C_INTR_GENCALL))))

		return IRQ_NONE;



	spin_lock(&iface->lock);

	del_timer(&iface->timeout_timer);

	s6i2c_handle_interrupt(iface);

	spin_unlock(&iface->lock);

	return IRQ_HANDLED;

}



static void s6i2c_timeout(unsigned long data)

{

	struct s6i2c_if *iface = (struct s6i2c_if *)data;

	unsigned long flags;



	spin_lock_irqsave(&iface->lock, flags);

	s6i2c_handle_interrupt(iface);

	if (--iface->timeout_count > 0) {

		iface->timeout_timer.expires = jiffies + POLL_TIMEOUT;

		add_timer(&iface->timeout_timer);

	} else {

		complete(&iface->complete);

		i2c_wr16(iface, S6_I2C_INTRMASK, 0);

	}

	spin_unlock_irqrestore(&iface->lock, flags);

}



static int s6i2c_master_xfer(struct i2c_adapter *adap,

				struct i2c_msg *msgs, int num)

{

	struct s6i2c_if *iface = adap->algo_data;

	int i;

	if (num == 0)

		return 0;

	if (i2c_rd16(iface, S6_I2C_STATUS) & (1 << S6_I2C_STATUS_ACTIVITY))

		yield();

	i2c_wr16(iface, S6_I2C_INTRMASK, 0);

	i2c_rd16(iface, S6_I2C_CLRINTR);

	for (i = 0; i < num; i++) {

		if (msgs[i].flags & I2C_M_TEN) {

			dev_err(&adap->dev,

				"s6i2c: 10 bits addr not supported\n");

			return -EINVAL;

		}

		if (msgs[i].len == 0) {

			dev_err(&adap->dev,

				"s6i2c: zero length message not supported\n");

			return -EINVAL;

		}

		if (msgs[i].addr != msgs[0].addr) {

			dev_err(&adap->dev,

				"s6i2c: multiple xfer cannot change target\n");

			return -EINVAL;

		}

	}



	iface->msgs = msgs;

	iface->msgs_num = num;

	iface->msgs_push = 0;

	iface->msgs_done = 0;

	iface->push = 0;

	iface->done = 0;

	iface->timeout_count = 10;

	i2c_wr16(iface, S6_I2C_TAR, msgs[0].addr);

	i2c_wr16(iface, S6_I2C_ENABLE, 1);

	i2c_wr16(iface, S6_I2C_INTRMASK, (1 << S6_I2C_INTR_TXEMPTY) |

					 (1 << S6_I2C_INTR_TXABRT));



	iface->timeout_timer.expires = jiffies + POLL_TIMEOUT;

	add_timer(&iface->timeout_timer);

	wait_for_completion(&iface->complete);

	del_timer_sync(&iface->timeout_timer);

	while (i2c_rd32(iface, S6_I2C_TXFLR) > 0)

		schedule();

	while (i2c_rd16(iface, S6_I2C_STATUS) & (1 << S6_I2C_STATUS_ACTIVITY))

		schedule();



	i2c_wr16(iface, S6_I2C_INTRMASK, 0);

	i2c_wr16(iface, S6_I2C_ENABLE, 0);

	return iface->msgs_done;

}



static u32 s6i2c_functionality(struct i2c_adapter *adap)

{

	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;

}



static struct i2c_algorithm s6i2c_algorithm = {

	.master_xfer   = s6i2c_master_xfer,

	.functionality = s6i2c_functionality,

};



static u16 nanoseconds_on_clk(struct s6i2c_if *iface, u32 ns)

{

	u32 dividend = ((clk_get_rate(iface->clk) / 1000) * ns) / 1000000;

	if (dividend > 0xffff)

		return 0xffff;

	return dividend;

}



static int s6i2c_probe(struct platform_device *dev)

{

	struct s6i2c_if *iface = &s6i2c_if;

	struct i2c_adapter *p_adap;

	const char *clock;

	int bus_num, rc;

	spin_lock_init(&iface->lock);

	init_completion(&iface->complete);

	iface->irq = platform_get_irq(dev, 0);

	if (iface->irq < 0) {

		rc = iface->irq;

		goto err_out;

	}

	iface->res = platform_get_resource(dev, IORESOURCE_MEM, 0);

	if (!iface->res) {

		rc = -ENXIO;

		goto err_out;

	}

	iface->res = request_mem_region(iface->res->start,

					resource_size(iface->res),

					dev->dev.bus_id);

	if (!iface->res) {

		rc = -EBUSY;

		goto err_out;

	}

	iface->reg = ioremap_nocache(iface->res->start,

				     resource_size(iface->res));

	if (!iface->reg) {

		rc = -ENOMEM;

		goto err_reg;

	}



	clock = 0;

	bus_num = -1;

	if (dev_get_platdata(&dev->dev)) {

		struct s6_i2c_platform_data *pdata =

			dev_get_platdata(&dev->dev);

		bus_num = pdata->bus_num;

		clock = pdata->clock;

	}

	iface->clk = clk_get(&dev->dev, clock);

	if (IS_ERR(iface->clk)) {

		rc = PTR_ERR(iface->clk);

		goto err_map;

	}

	rc = clk_enable(iface->clk);

	if (rc < 0)

		goto err_clk_put;

	init_timer(&iface->timeout_timer);

	iface->timeout_timer.function = s6i2c_timeout;

	iface->timeout_timer.data = (unsigned long)iface;



	p_adap = &iface->adap;

	strlcpy(p_adap->name, dev->name, sizeof(p_adap->name));

	p_adap->algo = &s6i2c_algorithm;

	p_adap->algo_data = iface;

	p_adap->nr = bus_num;

	p_adap->class = 0;

	p_adap->dev.parent = &dev->dev;

	i2c_wr16(iface, S6_I2C_INTRMASK, 0);

	rc = request_irq(iface->irq, s6i2c_interrupt_entry,

			 IRQF_SHARED, dev->name, iface);

	if (rc) {

		dev_err(&p_adap->dev, "s6i2c: can't get IRQ %d\n", iface->irq);

		goto err_clk_dis;

	}



	i2c_wr16(iface, S6_I2C_ENABLE, 0);

	udelay(1);

	i2c_wr32(iface, S6_I2C_SRESET, 1 << S6_I2C_SRESET_IC_SRST);

	i2c_wr16(iface, S6_I2C_CLRTXABRT, 1);

	i2c_wr16(iface, S6_I2C_CON,

			(1 << S6_I2C_CON_MASTER) |

			(S6_I2C_CON_SPEED_NORMAL << S6_I2C_CON_SPEED) |

			(0 << S6_I2C_CON_10BITSLAVE) |

			(0 << S6_I2C_CON_10BITMASTER) |

			(1 << S6_I2C_CON_RESTARTENA) |

			(1 << S6_I2C_CON_SLAVEDISABLE));

	i2c_wr16(iface, S6_I2C_SSHCNT, nanoseconds_on_clk(iface, 4000));

	i2c_wr16(iface, S6_I2C_SSLCNT, nanoseconds_on_clk(iface, 4700));

	i2c_wr16(iface, S6_I2C_FSHCNT, nanoseconds_on_clk(iface, 600));

	i2c_wr16(iface, S6_I2C_FSLCNT, nanoseconds_on_clk(iface, 1300));

	i2c_wr16(iface, S6_I2C_RXTL, 0);

	i2c_wr16(iface, S6_I2C_TXTL, 0);



	platform_set_drvdata(dev, iface);

	rc = i2c_add_numbered_adapter(p_adap);

	if (rc)

		goto err_irq_free;

	return 0;



err_irq_free:

	free_irq(iface->irq, iface);

err_clk_dis:

	clk_disable(iface->clk);

err_clk_put:

	clk_put(iface->clk);

err_map:

	iounmap(iface->reg);

err_reg:

	release_mem_region(iface->res->start,

			   resource_size(iface->res));

err_out:

	return rc;

}



static int s6i2c_remove(struct platform_device *pdev)

{

	struct s6i2c_if *iface = platform_get_drvdata(pdev);

	i2c_wr16(iface, S6_I2C_ENABLE, 0);

	i2c_del_adapter(&iface->adap);

	free_irq(iface->irq, iface);

	clk_disable(iface->clk);

	clk_put(iface->clk);

	iounmap(iface->reg);

	release_mem_region(iface->res->start,

			   resource_size(iface->res));

	return 0;

}



static struct platform_driver s6i2c_driver = {

	.probe		= s6i2c_probe,

	.remove		= s6i2c_remove,

	.driver		= {

		.name	= DRV_NAME,

		.owner	= THIS_MODULE,

	},

};



static int __init s6i2c_init(void)

{

	pr_info("I2C: S6000 I2C driver\n");

	return platform_driver_register(&s6i2c_driver);

}



static void __exit s6i2c_exit(void)

{

	platform_driver_unregister(&s6i2c_driver);

}



MODULE_DESCRIPTION("I2C-Bus adapter routines for S6000 I2C");

MODULE_LICENSE("GPL");

MODULE_ALIAS("platform:" DRV_NAME);



subsys_initcall(s6i2c_init);

module_exit(s6i2c_exit);

drivers/i2c/busses/i2c-s6000.h

deleted100644 → 0
+0 −79
Original line number Diff line number Diff line 
/*

 * drivers/i2c/busses/i2c-s6000.h

 *

 * This file is subject to the terms and conditions of the GNU General Public

 * License.  See the file "COPYING" in the main directory of this archive

 * for more details.

 *

 * Copyright (C) 2008 Emlix GmbH <info@emlix.com>

 * Author:	Oskar Schirmer <oskar@scara.com>

 */



#ifndef __DRIVERS_I2C_BUSSES_I2C_S6000_H

#define __DRIVERS_I2C_BUSSES_I2C_S6000_H



#define S6_I2C_CON		0x000

#define S6_I2C_CON_MASTER		0

#define S6_I2C_CON_SPEED		1

#define S6_I2C_CON_SPEED_NORMAL			1

#define S6_I2C_CON_SPEED_FAST			2

#define S6_I2C_CON_SPEED_MASK			3

#define S6_I2C_CON_10BITSLAVE		3

#define S6_I2C_CON_10BITMASTER		4

#define S6_I2C_CON_RESTARTENA		5

#define S6_I2C_CON_SLAVEDISABLE		6

#define S6_I2C_TAR		0x004

#define S6_I2C_TAR_GCORSTART		10

#define S6_I2C_TAR_SPECIAL		11

#define S6_I2C_SAR		0x008

#define S6_I2C_HSMADDR		0x00C

#define S6_I2C_DATACMD		0x010

#define S6_I2C_DATACMD_READ		8

#define S6_I2C_SSHCNT		0x014

#define S6_I2C_SSLCNT		0x018

#define S6_I2C_FSHCNT		0x01C

#define S6_I2C_FSLCNT		0x020

#define S6_I2C_INTRSTAT		0x02C

#define S6_I2C_INTRMASK		0x030

#define S6_I2C_RAWINTR		0x034

#define S6_I2C_INTR_RXUNDER		0

#define S6_I2C_INTR_RXOVER		1

#define S6_I2C_INTR_RXFULL		2

#define S6_I2C_INTR_TXOVER		3

#define S6_I2C_INTR_TXEMPTY		4

#define S6_I2C_INTR_RDREQ		5

#define S6_I2C_INTR_TXABRT		6

#define S6_I2C_INTR_RXDONE		7

#define S6_I2C_INTR_ACTIVITY		8

#define S6_I2C_INTR_STOPDET		9

#define S6_I2C_INTR_STARTDET		10

#define S6_I2C_INTR_GENCALL		11

#define S6_I2C_RXTL		0x038

#define S6_I2C_TXTL		0x03C

#define S6_I2C_CLRINTR		0x040

#define S6_I2C_CLRRXUNDER	0x044

#define S6_I2C_CLRRXOVER	0x048

#define S6_I2C_CLRTXOVER	0x04C

#define S6_I2C_CLRRDREQ		0x050

#define S6_I2C_CLRTXABRT	0x054

#define S6_I2C_CLRRXDONE	0x058

#define S6_I2C_CLRACTIVITY	0x05C

#define S6_I2C_CLRSTOPDET	0x060

#define S6_I2C_CLRSTARTDET	0x064

#define S6_I2C_CLRGENCALL	0x068

#define S6_I2C_ENABLE		0x06C

#define S6_I2C_STATUS		0x070

#define S6_I2C_STATUS_ACTIVITY		0

#define S6_I2C_STATUS_TFNF		1

#define S6_I2C_STATUS_TFE		2

#define S6_I2C_STATUS_RFNE		3

#define S6_I2C_STATUS_RFF		4

#define S6_I2C_TXFLR		0x074

#define S6_I2C_RXFLR		0x078

#define S6_I2C_SRESET		0x07C

#define S6_I2C_SRESET_IC_SRST		0

#define S6_I2C_SRESET_IC_MASTER_SRST	1

#define S6_I2C_SRESET_IC_SLAVE_SRST	2

#define S6_I2C_TXABRTSOURCE	0x080



#endif

include/linux/i2c/s6000.h

deleted100644 → 0
+0 −10
Original line number Diff line number Diff line 
#ifndef __LINUX_I2C_S6000_H

#define __LINUX_I2C_S6000_H



struct s6_i2c_platform_data {

	const char *clock; /* the clock to use */

	int bus_num; /* the bus number to register */

};



#endif