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From:   Rob Herring <robh@kernel.org>
To:     Wolfram Sang <wsa@kernel.org>
Cc:     linux-kernel@vger.kernel.org,
        Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
        linux-mips@vger.kernel.org, George Cherian <gcherian@marvell.com>,
        linux-i2c@vger.kernel.org
Subject: [PATCH 2/2] i2c: Remove unused Netlogic/Sigma Designs XLR driver
Date:   Tue,  9 Nov 2021 10:16:19 -0600
Message-Id: <20211109161619.2206494-2-robh@kernel.org>
In-Reply-To: <20211109161619.2206494-1-robh@kernel.org>
References: <20211109161619.2206494-1-robh@kernel.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

Commits 95b8a5e0111a ("MIPS: Remove NETLOGIC support") and edd4488aea9c
("ARM: remove tango platform") removed Netlogic XLR and Sigma Designs
Tango platforms which means there are no platforms using the XLR I2C
driver and it can be removed.

Cc: linux-i2c@vger.kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>
---
 drivers/i2c/busses/Kconfig   |  10 -
 drivers/i2c/busses/Makefile  |   1 -
 drivers/i2c/busses/i2c-xlr.c | 470 -----------------------------------
 3 files changed, 481 deletions(-)
 delete mode 100644 drivers/i2c/busses/i2c-xlr.c

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index e9dd1640ffde..2f0a440ec446 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -1159,16 +1159,6 @@ config I2C_XILINX
 	  This driver can also be built as a module.  If so, the module
 	  will be called xilinx_i2c.
 
-config I2C_XLR
-	tristate "Netlogic XLR I2C support"
-	depends on CPU_XLR || COMPILE_TEST
-	help
-	  This driver enables support for the on-chip I2C interface of
-	  the Netlogic XLR/XLS MIPS processors and Sigma Designs SOCs.
-
-	  This driver can also be built as a module.  If so, the module
-	  will be called i2c-xlr.
-
 config I2C_XLP9XX
 	tristate "Cavium ThunderX2 I2C support"
 	depends on ARCH_THUNDER2 || COMPILE_TEST
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index d85899fef8c7..1d00dce77098 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -119,7 +119,6 @@ obj-$(CONFIG_I2C_OCTEON)	+= i2c-octeon.o
 i2c-thunderx-objs := i2c-octeon-core.o i2c-thunderx-pcidrv.o
 obj-$(CONFIG_I2C_THUNDERX)	+= i2c-thunderx.o
 obj-$(CONFIG_I2C_XILINX)	+= i2c-xiic.o
-obj-$(CONFIG_I2C_XLR)		+= i2c-xlr.o
 obj-$(CONFIG_I2C_XLP9XX)	+= i2c-xlp9xx.o
 obj-$(CONFIG_I2C_RCAR)		+= i2c-rcar.o
 
diff --git a/drivers/i2c/busses/i2c-xlr.c b/drivers/i2c/busses/i2c-xlr.c
deleted file mode 100644
index 9ce20652d494..000000000000
--- a/drivers/i2c/busses/i2c-xlr.c
+++ /dev/null
@@ -1,470 +0,0 @@
-/*
- * Copyright 2011, Netlogic Microsystems Inc.
- * Copyright 2004, Matt Porter <mporter@kernel.crashing.org>
- *
- * This file is licensed under the terms of the GNU General Public
- * License version 2.  This program is licensed "as is" without any
- * warranty of any kind, whether express or implied.
- */
-
-#include <linux/err.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/slab.h>
-#include <linux/ioport.h>
-#include <linux/delay.h>
-#include <linux/errno.h>
-#include <linux/i2c.h>
-#include <linux/io.h>
-#include <linux/platform_device.h>
-#include <linux/of_device.h>
-#include <linux/clk.h>
-#include <linux/interrupt.h>
-#include <linux/wait.h>
-
-/* XLR I2C REGISTERS */
-#define XLR_I2C_CFG		0x00
-#define XLR_I2C_CLKDIV		0x01
-#define XLR_I2C_DEVADDR		0x02
-#define XLR_I2C_ADDR		0x03
-#define XLR_I2C_DATAOUT		0x04
-#define XLR_I2C_DATAIN		0x05
-#define XLR_I2C_STATUS		0x06
-#define XLR_I2C_STARTXFR	0x07
-#define XLR_I2C_BYTECNT		0x08
-#define XLR_I2C_HDSTATIM	0x09
-
-/* Sigma Designs additional registers */
-#define XLR_I2C_INT_EN		0x09
-#define XLR_I2C_INT_STAT	0x0a
-
-/* XLR I2C REGISTERS FLAGS */
-#define XLR_I2C_BUS_BUSY	0x01
-#define XLR_I2C_SDOEMPTY	0x02
-#define XLR_I2C_RXRDY		0x04
-#define XLR_I2C_ACK_ERR		0x08
-#define XLR_I2C_ARB_STARTERR	0x30
-
-/* Register Values */
-#define XLR_I2C_CFG_ADDR	0xF8
-#define XLR_I2C_CFG_NOADDR	0xFA
-#define XLR_I2C_STARTXFR_ND	0x02    /* No Data */
-#define XLR_I2C_STARTXFR_RD	0x01    /* Read */
-#define XLR_I2C_STARTXFR_WR	0x00    /* Write */
-
-#define XLR_I2C_TIMEOUT		10	/* timeout per byte in msec */
-
-/*
- * On XLR/XLS, we need to use __raw_ IO to read the I2C registers
- * because they are in the big-endian MMIO area on the SoC.
- *
- * The readl/writel implementation on XLR/XLS byteswaps, because
- * those are for its little-endian PCI space (see arch/mips/Kconfig).
- */
-static inline void xlr_i2c_wreg(u32 __iomem *base, unsigned int reg, u32 val)
-{
-	__raw_writel(val, base + reg);
-}
-
-static inline u32 xlr_i2c_rdreg(u32 __iomem *base, unsigned int reg)
-{
-	return __raw_readl(base + reg);
-}
-
-#define XLR_I2C_FLAG_IRQ	1
-
-struct xlr_i2c_config {
-	u32 flags;		/* optional feature support */
-	u32 status_busy;	/* value of STATUS[0] when busy */
-	u32 cfg_extra;		/* extra CFG bits to set */
-};
-
-struct xlr_i2c_private {
-	struct i2c_adapter adap;
-	u32 __iomem *iobase;
-	int irq;
-	int pos;
-	struct i2c_msg *msg;
-	const struct xlr_i2c_config *cfg;
-	wait_queue_head_t wait;
-	struct clk *clk;
-};
-
-static int xlr_i2c_busy(struct xlr_i2c_private *priv, u32 status)
-{
-	return (status & XLR_I2C_BUS_BUSY) == priv->cfg->status_busy;
-}
-
-static int xlr_i2c_idle(struct xlr_i2c_private *priv)
-{
-	return !xlr_i2c_busy(priv, xlr_i2c_rdreg(priv->iobase, XLR_I2C_STATUS));
-}
-
-static int xlr_i2c_wait(struct xlr_i2c_private *priv, unsigned long timeout)
-{
-	int status;
-	int t;
-
-	t = wait_event_timeout(priv->wait, xlr_i2c_idle(priv),
-				msecs_to_jiffies(timeout));
-	if (!t)
-		return -ETIMEDOUT;
-
-	status = xlr_i2c_rdreg(priv->iobase, XLR_I2C_STATUS);
-
-	return status & XLR_I2C_ACK_ERR ? -EIO : 0;
-}
-
-static void xlr_i2c_tx_irq(struct xlr_i2c_private *priv, u32 status)
-{
-	struct i2c_msg *msg = priv->msg;
-
-	if (status & XLR_I2C_SDOEMPTY)
-		xlr_i2c_wreg(priv->iobase, XLR_I2C_DATAOUT,
-				msg->buf[priv->pos++]);
-}
-
-static void xlr_i2c_rx_irq(struct xlr_i2c_private *priv, u32 status)
-{
-	struct i2c_msg *msg = priv->msg;
-
-	if (status & XLR_I2C_RXRDY)
-		msg->buf[priv->pos++] =
-			xlr_i2c_rdreg(priv->iobase, XLR_I2C_DATAIN);
-}
-
-static irqreturn_t xlr_i2c_irq(int irq, void *dev_id)
-{
-	struct xlr_i2c_private *priv = dev_id;
-	struct i2c_msg *msg = priv->msg;
-	u32 int_stat, status;
-
-	int_stat = xlr_i2c_rdreg(priv->iobase, XLR_I2C_INT_STAT);
-	if (!int_stat)
-		return IRQ_NONE;
-
-	xlr_i2c_wreg(priv->iobase, XLR_I2C_INT_STAT, int_stat);
-
-	if (!msg)
-		return IRQ_HANDLED;
-
-	status = xlr_i2c_rdreg(priv->iobase, XLR_I2C_STATUS);
-
-	if (priv->pos < msg->len) {
-		if (msg->flags & I2C_M_RD)
-			xlr_i2c_rx_irq(priv, status);
-		else
-			xlr_i2c_tx_irq(priv, status);
-	}
-
-	if (!xlr_i2c_busy(priv, status))
-		wake_up(&priv->wait);
-
-	return IRQ_HANDLED;
-}
-
-static int xlr_i2c_tx(struct xlr_i2c_private *priv,  u16 len,
-	u8 *buf, u16 addr)
-{
-	struct i2c_adapter *adap = &priv->adap;
-	unsigned long timeout, stoptime, checktime;
-	u32 i2c_status;
-	int pos, timedout;
-	u8 offset;
-	u32 xfer;
-
-	offset = buf[0];
-	xlr_i2c_wreg(priv->iobase, XLR_I2C_ADDR, offset);
-	xlr_i2c_wreg(priv->iobase, XLR_I2C_DEVADDR, addr);
-	xlr_i2c_wreg(priv->iobase, XLR_I2C_CFG,
-			XLR_I2C_CFG_ADDR | priv->cfg->cfg_extra);
-
-	timeout = msecs_to_jiffies(XLR_I2C_TIMEOUT);
-	stoptime = jiffies + timeout;
-	timedout = 0;
-
-	if (len == 1) {
-		xlr_i2c_wreg(priv->iobase, XLR_I2C_BYTECNT, len - 1);
-		xfer = XLR_I2C_STARTXFR_ND;
-		pos = 1;
-	} else {
-		xlr_i2c_wreg(priv->iobase, XLR_I2C_BYTECNT, len - 2);
-		xlr_i2c_wreg(priv->iobase, XLR_I2C_DATAOUT, buf[1]);
-		xfer = XLR_I2C_STARTXFR_WR;
-		pos = 2;
-	}
-
-	priv->pos = pos;
-
-retry:
-	/* retry can only happen on the first byte */
-	xlr_i2c_wreg(priv->iobase, XLR_I2C_STARTXFR, xfer);
-
-	if (priv->irq > 0)
-		return xlr_i2c_wait(priv, XLR_I2C_TIMEOUT * len);
-
-	while (!timedout) {
-		checktime = jiffies;
-		i2c_status = xlr_i2c_rdreg(priv->iobase, XLR_I2C_STATUS);
-
-		if ((i2c_status & XLR_I2C_SDOEMPTY) && pos < len) {
-			xlr_i2c_wreg(priv->iobase, XLR_I2C_DATAOUT, buf[pos++]);
-
-			/* reset timeout on successful xmit */
-			stoptime = jiffies + timeout;
-		}
-		timedout = time_after(checktime, stoptime);
-
-		if (i2c_status & XLR_I2C_ARB_STARTERR) {
-			if (timedout)
-				break;
-			goto retry;
-		}
-
-		if (i2c_status & XLR_I2C_ACK_ERR)
-			return -EIO;
-
-		if (!xlr_i2c_busy(priv, i2c_status) && pos >= len)
-			return 0;
-	}
-	dev_err(&adap->dev, "I2C transmit timeout\n");
-	return -ETIMEDOUT;
-}
-
-static int xlr_i2c_rx(struct xlr_i2c_private *priv, u16 len, u8 *buf, u16 addr)
-{
-	struct i2c_adapter *adap = &priv->adap;
-	u32 i2c_status;
-	unsigned long timeout, stoptime, checktime;
-	int nbytes, timedout;
-
-	xlr_i2c_wreg(priv->iobase, XLR_I2C_CFG,
-			XLR_I2C_CFG_NOADDR | priv->cfg->cfg_extra);
-	xlr_i2c_wreg(priv->iobase, XLR_I2C_BYTECNT, len - 1);
-	xlr_i2c_wreg(priv->iobase, XLR_I2C_DEVADDR, addr);
-
-	priv->pos = 0;
-
-	timeout = msecs_to_jiffies(XLR_I2C_TIMEOUT);
-	stoptime = jiffies + timeout;
-	timedout = 0;
-	nbytes = 0;
-retry:
-	xlr_i2c_wreg(priv->iobase, XLR_I2C_STARTXFR, XLR_I2C_STARTXFR_RD);
-
-	if (priv->irq > 0)
-		return xlr_i2c_wait(priv, XLR_I2C_TIMEOUT * len);
-
-	while (!timedout) {
-		checktime = jiffies;
-		i2c_status = xlr_i2c_rdreg(priv->iobase, XLR_I2C_STATUS);
-		if (i2c_status & XLR_I2C_RXRDY) {
-			if (nbytes >= len)
-				return -EIO;	/* should not happen */
-
-			buf[nbytes++] =
-				xlr_i2c_rdreg(priv->iobase, XLR_I2C_DATAIN);
-
-			/* reset timeout on successful read */
-			stoptime = jiffies + timeout;
-		}
-
-		timedout = time_after(checktime, stoptime);
-		if (i2c_status & XLR_I2C_ARB_STARTERR) {
-			if (timedout)
-				break;
-			goto retry;
-		}
-
-		if (i2c_status & XLR_I2C_ACK_ERR)
-			return -EIO;
-
-		if (!xlr_i2c_busy(priv, i2c_status))
-			return 0;
-	}
-
-	dev_err(&adap->dev, "I2C receive timeout\n");
-	return -ETIMEDOUT;
-}
-
-static int xlr_i2c_xfer(struct i2c_adapter *adap,
-	struct i2c_msg *msgs, int num)
-{
-	struct i2c_msg *msg;
-	int i;
-	int ret = 0;
-	struct xlr_i2c_private *priv = i2c_get_adapdata(adap);
-
-	ret = clk_enable(priv->clk);
-	if (ret)
-		return ret;
-
-	if (priv->irq)
-		xlr_i2c_wreg(priv->iobase, XLR_I2C_INT_EN, 0xf);
-
-
-	for (i = 0; ret == 0 && i < num; i++) {
-		msg = &msgs[i];
-		priv->msg = msg;
-		if (msg->flags & I2C_M_RD)
-			ret = xlr_i2c_rx(priv, msg->len, &msg->buf[0],
-					msg->addr);
-		else
-			ret = xlr_i2c_tx(priv, msg->len, &msg->buf[0],
-					msg->addr);
-	}
-
-	if (priv->irq)
-		xlr_i2c_wreg(priv->iobase, XLR_I2C_INT_EN, 0);
-
-	clk_disable(priv->clk);
-	priv->msg = NULL;
-
-	return (ret != 0) ? ret : num;
-}
-
-static u32 xlr_func(struct i2c_adapter *adap)
-{
-	/* Emulate SMBUS over I2C */
-	return (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK) | I2C_FUNC_I2C;
-}
-
-static const struct i2c_algorithm xlr_i2c_algo = {
-	.master_xfer	= xlr_i2c_xfer,
-	.functionality	= xlr_func,
-};
-
-static const struct i2c_adapter_quirks xlr_i2c_quirks = {
-	.flags = I2C_AQ_NO_ZERO_LEN,
-};
-
-static const struct xlr_i2c_config xlr_i2c_config_default = {
-	.status_busy	= XLR_I2C_BUS_BUSY,
-	.cfg_extra	= 0,
-};
-
-static const struct xlr_i2c_config xlr_i2c_config_tangox = {
-	.flags		= XLR_I2C_FLAG_IRQ,
-	.status_busy	= 0,
-	.cfg_extra	= 1 << 8,
-};
-
-static const struct of_device_id xlr_i2c_dt_ids[] = {
-	{
-		.compatible	= "sigma,smp8642-i2c",
-		.data		= &xlr_i2c_config_tangox,
-	},
-	{ }
-};
-MODULE_DEVICE_TABLE(of, xlr_i2c_dt_ids);
-
-static int xlr_i2c_probe(struct platform_device *pdev)
-{
-	const struct of_device_id *match;
-	struct xlr_i2c_private  *priv;
-	struct clk *clk;
-	unsigned long clk_rate;
-	unsigned long clk_div;
-	u32 busfreq;
-	int irq;
-	int ret;
-
-	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
-	if (!priv)
-		return -ENOMEM;
-
-	match = of_match_device(xlr_i2c_dt_ids, &pdev->dev);
-	if (match)
-		priv->cfg = match->data;
-	else
-		priv->cfg = &xlr_i2c_config_default;
-
-	priv->iobase = devm_platform_ioremap_resource(pdev, 0);
-	if (IS_ERR(priv->iobase))
-		return PTR_ERR(priv->iobase);
-
-	irq = platform_get_irq(pdev, 0);
-
-	if (irq > 0 && (priv->cfg->flags & XLR_I2C_FLAG_IRQ)) {
-		priv->irq = irq;
-
-		xlr_i2c_wreg(priv->iobase, XLR_I2C_INT_EN, 0);
-		xlr_i2c_wreg(priv->iobase, XLR_I2C_INT_STAT, 0xf);
-
-		ret = devm_request_irq(&pdev->dev, priv->irq, xlr_i2c_irq,
-					IRQF_SHARED, dev_name(&pdev->dev),
-					priv);
-		if (ret)
-			return ret;
-
-		init_waitqueue_head(&priv->wait);
-	}
-
-	if (of_property_read_u32(pdev->dev.of_node, "clock-frequency",
-				 &busfreq))
-		busfreq = I2C_MAX_STANDARD_MODE_FREQ;
-
-	clk = devm_clk_get(&pdev->dev, NULL);
-	if (!IS_ERR(clk)) {
-		ret = clk_prepare_enable(clk);
-		if (ret)
-			return ret;
-
-		clk_rate = clk_get_rate(clk);
-		clk_div = DIV_ROUND_UP(clk_rate, 2 * busfreq);
-		xlr_i2c_wreg(priv->iobase, XLR_I2C_CLKDIV, clk_div);
-
-		clk_disable(clk);
-		priv->clk = clk;
-	}
-
-	priv->adap.dev.parent = &pdev->dev;
-	priv->adap.dev.of_node	= pdev->dev.of_node;
-	priv->adap.owner	= THIS_MODULE;
-	priv->adap.algo_data	= priv;
-	priv->adap.algo		= &xlr_i2c_algo;
-	priv->adap.quirks	= &xlr_i2c_quirks;
-	priv->adap.nr		= pdev->id;
-	priv->adap.class	= I2C_CLASS_HWMON;
-	snprintf(priv->adap.name, sizeof(priv->adap.name), "xlr-i2c");
-
-	i2c_set_adapdata(&priv->adap, priv);
-	ret = i2c_add_numbered_adapter(&priv->adap);
-	if (ret < 0)
-		goto err_unprepare_clk;
-
-	platform_set_drvdata(pdev, priv);
-	dev_info(&priv->adap.dev, "Added I2C Bus.\n");
-	return 0;
-
-err_unprepare_clk:
-	clk_unprepare(clk);
-	return ret;
-}
-
-static int xlr_i2c_remove(struct platform_device *pdev)
-{
-	struct xlr_i2c_private *priv;
-
-	priv = platform_get_drvdata(pdev);
-	i2c_del_adapter(&priv->adap);
-	clk_unprepare(priv->clk);
-
-	return 0;
-}
-
-static struct platform_driver xlr_i2c_driver = {
-	.probe  = xlr_i2c_probe,
-	.remove = xlr_i2c_remove,
-	.driver = {
-		.name   = "xlr-i2cbus",
-		.of_match_table	= xlr_i2c_dt_ids,
-	},
-};
-
-module_platform_driver(xlr_i2c_driver);
-
-MODULE_AUTHOR("Ganesan Ramalingam <ganesanr@netlogicmicro.com>");
-MODULE_DESCRIPTION("XLR/XLS SoC I2C Controller driver");
-MODULE_LICENSE("GPL v2");
-MODULE_ALIAS("platform:xlr-i2cbus");
-- 
2.32.0