i2c: at91: remove old polling driver

It will get replaced by a superior one. Safe to remove since this one
depends on BROKEN anyhow.

Signed-off-by: Nikolaus Voss <n.voss@weinmann.de>
Tested-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Reviewed-by: Nicolas Ferre <nicolas.ferre@atmel.com>

[wsa: added commit message]

Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>

2 files changed, 0 insertions, 316 deletions

diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index ce3c2be7fb40..4f46873282b8 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -28,7 +28,6 @@ obj-$(CONFIG_I2C_HYDRA)		+= i2c-hydra.o
 obj-$(CONFIG_I2C_POWERMAC)      += i2c-powermac.o
 
 # Embedded system I2C/SMBus host controller drivers
-obj-$(CONFIG_I2C_AT91)          += i2c-at91.o
 obj-$(CONFIG_I2C_AU1550)        += i2c-au1550.o
 obj-$(CONFIG_I2C_BLACKFIN_TWI)  += i2c-bfin-twi.o
 obj-$(CONFIG_I2C_CPM)           += i2c-cpm.o
diff --git a/drivers/i2c/busses/i2c-at91.c b/drivers/i2c/busses/i2c-at91.c
deleted file mode 100644
index e24484beef07..000000000000
--- a/drivers/i2c/busses/i2c-at91.c
+++ /dev/null
@@ -1,315 +0,0 @@
-/*
-    i2c Support for Atmel's AT91 Two-Wire Interface (TWI)
-
-    Copyright (C) 2004 Rick Bronson
-    Converted to 2.6 by Andrew Victor <andrew@sanpeople.com>
-
-    Borrowed heavily from original work by:
-    Copyright (C) 2000 Philip Edelbrock <phil@stimpy.netroedge.com>
-
-    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.
-*/
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/err.h>
-#include <linux/slab.h>
-#include <linux/types.h>
-#include <linux/delay.h>
-#include <linux/i2c.h>
-#include <linux/init.h>
-#include <linux/clk.h>
-#include <linux/platform_device.h>
-#include <linux/io.h>
-
-#include <mach/at91_twi.h>
-#include <mach/board.h>
-#include <mach/cpu.h>
-
-#define TWI_CLOCK               100000          /* Hz. max 400 Kbits/sec */
-
-
-static struct clk *twi_clk;
-static void __iomem *twi_base;
-
-#define at91_twi_read(reg)              __raw_readl(twi_base + (reg))
-#define at91_twi_write(reg, val)        __raw_writel((val), twi_base + (reg))
-
-
-/*
- * Initialize the TWI hardware registers.
- */
-static void __devinit at91_twi_hwinit(void)
-{
-        unsigned long cdiv, ckdiv;
-
-        at91_twi_write(AT91_TWI_IDR, 0xffffffff);       /* Disable all interrupts */
-        at91_twi_write(AT91_TWI_CR, AT91_TWI_SWRST);    /* Reset peripheral */
-        at91_twi_write(AT91_TWI_CR, AT91_TWI_MSEN);     /* Set Master mode */
-
-        /* Calcuate clock dividers */
-        cdiv = (clk_get_rate(twi_clk) / (2 * TWI_CLOCK)) - 3;
-        cdiv = cdiv + 1;        /* round up */
-        ckdiv = 0;
-        while (cdiv > 255) {
-                ckdiv++;
-                cdiv = cdiv >> 1;
-        }
-
-        if (cpu_is_at91rm9200()) {                      /* AT91RM9200 Errata #22 */
-                if (ckdiv > 5) {
-                        printk(KERN_ERR "AT91 I2C: Invalid TWI_CLOCK value!\n");
-                        ckdiv = 5;
-                }
-        }
-
-        at91_twi_write(AT91_TWI_CWGR, (ckdiv << 16) | (cdiv << 8) | cdiv);
-}
-
-/*
- * Poll the i2c status register until the specified bit is set.
- * Returns 0 if timed out (100 msec).
- */
-static short at91_poll_status(unsigned long bit)
-{
-        int loop_cntr = 10000;
-
-        do {
-                udelay(10);
-        } while (!(at91_twi_read(AT91_TWI_SR) & bit) && (--loop_cntr > 0));
-
-        return (loop_cntr > 0);
-}
-
-static int xfer_read(struct i2c_adapter *adap, unsigned char *buf, int length)
-{
-        /* Send Start */
-        at91_twi_write(AT91_TWI_CR, AT91_TWI_START);
-
-        /* Read data */
-        while (length--) {
-                if (!length)    /* need to send Stop before reading last byte */
-                        at91_twi_write(AT91_TWI_CR, AT91_TWI_STOP);
-                if (!at91_poll_status(AT91_TWI_RXRDY)) {
-                        dev_dbg(&adap->dev, "RXRDY timeout\n");
-                        return -ETIMEDOUT;
-                }
-                *buf++ = (at91_twi_read(AT91_TWI_RHR) & 0xff);
-        }
-
-        return 0;
-}
-
-static int xfer_write(struct i2c_adapter *adap, unsigned char *buf, int length)
-{
-        /* Load first byte into transmitter */
-        at91_twi_write(AT91_TWI_THR, *buf++);
-
-        /* Send Start */
-        at91_twi_write(AT91_TWI_CR, AT91_TWI_START);
-
-        do {
-                if (!at91_poll_status(AT91_TWI_TXRDY)) {
-                        dev_dbg(&adap->dev, "TXRDY timeout\n");
-                        return -ETIMEDOUT;
-                }
-
-                length--;       /* byte was transmitted */
-
-                if (length > 0)         /* more data to send? */
-                        at91_twi_write(AT91_TWI_THR, *buf++);
-        } while (length);
-
-        /* Send Stop */
-        at91_twi_write(AT91_TWI_CR, AT91_TWI_STOP);
-
-        return 0;
-}
-
-/*
- * Generic i2c master transfer entrypoint.
- *
- * Note: We do not use Atmel's feature of storing the "internal device address".
- * Instead the "internal device address" has to be written using a separate
- * i2c message.
- * http://lists.arm.linux.org.uk/pipermail/linux-arm-kernel/2004-September/024411.html
- */
-static int at91_xfer(struct i2c_adapter *adap, struct i2c_msg *pmsg, int num)
-{
-        int i, ret;
-
-        dev_dbg(&adap->dev, "at91_xfer: processing %d messages:\n", num);
-
-        for (i = 0; i < num; i++) {
-                dev_dbg(&adap->dev, " #%d: %sing %d byte%s %s 0x%02x\n", i,
-                        pmsg->flags & I2C_M_RD ? "read" : "writ",
-                        pmsg->len, pmsg->len > 1 ? "s" : "",
-                        pmsg->flags & I2C_M_RD ? "from" : "to", pmsg->addr);
-
-                at91_twi_write(AT91_TWI_MMR, (pmsg->addr << 16)
-                        | ((pmsg->flags & I2C_M_RD) ? AT91_TWI_MREAD : 0));
-
-                if (pmsg->len && pmsg->buf) {   /* sanity check */
-                        if (pmsg->flags & I2C_M_RD)
-                                ret = xfer_read(adap, pmsg->buf, pmsg->len);
-                        else
-                                ret = xfer_write(adap, pmsg->buf, pmsg->len);
-
-                        if (ret)
-                                return ret;
-
-                        /* Wait until transfer is finished */
-                        if (!at91_poll_status(AT91_TWI_TXCOMP)) {
-                                dev_dbg(&adap->dev, "TXCOMP timeout\n");
-                                return -ETIMEDOUT;
-                        }
-                }
-                dev_dbg(&adap->dev, "transfer complete\n");
-                pmsg++;         /* next message */
-        }
-        return i;
-}
-
-/*
- * Return list of supported functionality.
- */
-static u32 at91_func(struct i2c_adapter *adapter)
-{
-        return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
-}
-
-static struct i2c_algorithm at91_algorithm = {
-        .master_xfer    = at91_xfer,
-        .functionality  = at91_func,
-};
-
-/*
- * Main initialization routine.
- */
-static int __devinit at91_i2c_probe(struct platform_device *pdev)
-{
-        struct i2c_adapter *adapter;
-        struct resource *res;
-        int rc;
-
-        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-        if (!res)
-                return -ENXIO;
-
-        if (!request_mem_region(res->start, resource_size(res), "at91_i2c"))
-                return -EBUSY;
-
-        twi_base = ioremap(res->start, resource_size(res));
-        if (!twi_base) {
-                rc = -ENOMEM;
-                goto fail0;
-        }
-
-        twi_clk = clk_get(NULL, "twi_clk");
-        if (IS_ERR(twi_clk)) {
-                dev_err(&pdev->dev, "no clock defined\n");
-                rc = -ENODEV;
-                goto fail1;
-        }
-
-        adapter = kzalloc(sizeof(struct i2c_adapter), GFP_KERNEL);
-        if (adapter == NULL) {
-                dev_err(&pdev->dev, "can't allocate inteface!\n");
-                rc = -ENOMEM;
-                goto fail2;
-        }
-        snprintf(adapter->name, sizeof(adapter->name), "AT91");
-        adapter->algo = &at91_algorithm;
-        adapter->class = I2C_CLASS_HWMON;
-        adapter->dev.parent = &pdev->dev;
-        /* adapter->id == 0 ... only one TWI controller for now */
-
-        platform_set_drvdata(pdev, adapter);
-
-        clk_enable(twi_clk);            /* enable peripheral clock */
-        at91_twi_hwinit();              /* initialize TWI controller */
-
-        rc = i2c_add_numbered_adapter(adapter);
-        if (rc) {
-                dev_err(&pdev->dev, "Adapter %s registration failed\n",
-                                adapter->name);
-                goto fail3;
-        }
-
-        dev_info(&pdev->dev, "AT91 i2c bus driver.\n");
-        return 0;
-
-fail3:
-        platform_set_drvdata(pdev, NULL);
-        kfree(adapter);
-        clk_disable(twi_clk);
-fail2:
-        clk_put(twi_clk);
-fail1:
-        iounmap(twi_base);
-fail0:
-        release_mem_region(res->start, resource_size(res));
-
-        return rc;
-}
-
-static int __devexit at91_i2c_remove(struct platform_device *pdev)
-{
-        struct i2c_adapter *adapter = platform_get_drvdata(pdev);
-        struct resource *res;
-        int rc;
-
-        rc = i2c_del_adapter(adapter);
-        platform_set_drvdata(pdev, NULL);
-
-        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-        iounmap(twi_base);
-        release_mem_region(res->start, resource_size(res));
-
-        clk_disable(twi_clk);           /* disable peripheral clock */
-        clk_put(twi_clk);
-
-        return rc;
-}
-
-#ifdef CONFIG_PM
-
-/* NOTE: could save a few mA by keeping clock off outside of at91_xfer... */
-
-static int at91_i2c_suspend(struct device *dev)
-{
-        clk_disable(twi_clk);
-        return 0;
-}
-
-static int at91_i2c_resume(struct device *dev)
-{
-        return clk_enable(twi_clk);
-}
-
-static SIMPLE_DEV_PM_OPS(at91_i2c_pm, at91_i2c_suspend, at91_i2c_resume);
-#define AT91_I2C_PM     (&at91_i2c_pm)
-
-#else
-#define AT91_I2C_PM     NULL
-#endif
-
-static struct platform_driver at91_i2c_driver = {
-        .probe          = at91_i2c_probe,
-        .remove         = __devexit_p(at91_i2c_remove),
-        .driver         = {
-                .name   = "at91_i2c",
-                .owner  = THIS_MODULE,
-                .pm     = AT91_I2C_PM,
-        },
-};
-
-module_platform_driver(at91_i2c_driver);
-
-MODULE_AUTHOR("Rick Bronson");
-MODULE_DESCRIPTION("I2C (TWI) driver for Atmel AT91");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:at91_i2c");