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: Wolfram Sang <wsa@the-dreams.de>

1 files changed, 0 insertions, 404 deletions

diff --git a/drivers/i2c/busses/i2c-s6000.c b/drivers/i2c/busses/i2c-s6000.c
deleted file mode 100644
index dd186a037684..000000000000
--- a/drivers/i2c/busses/i2c-s6000.c
+++ /dev/null
@@ -1,404 +0,0 @@
-/*
- * 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);