i2c: remove zte zx bus driver

The zte zx platform is getting removed, so this driver is no
longer needed.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

Documentation/devicetree/bindings/i2c/i2c-zx2967.txt

-ZTE zx2967 I2C controller
-
-Required properties:
- - compatible: must be "zte,zx296718-i2c"
- - reg: physical address and length of the device registers
- - interrupts: a single interrupt specifier
- - clocks: clock for the device
- - #address-cells: should be <1>
- - #size-cells: should be <0>
- - clock-frequency: the desired I2C bus clock frequency.
-
-Examples:
-
-	i2c@112000 {
-		compatible = "zte,zx296718-i2c";
-		reg = <0x00112000 0x1000>;
-		interrupts = <GIC_SPI 112 IRQ_TYPE_LEVEL_HIGH>;
-		clocks = <&osc24m>;
-		#address-cells = <1>
-		#size-cells = <0>;
-		clock-frequency = <1600000>;
-	};

drivers/i2c/busses/Kconfig

@@ -1370,15 +1370,6 @@ config I2C_OPAL
 	  This driver can also be built as a module. If so, the module will be
 	  called as i2c-opal.
 
-config I2C_ZX2967
-	tristate "ZTE ZX2967 I2C support"
-	depends on ARCH_ZX
-	default y
-	help
-	  Selecting this option will add ZX2967 I2C driver.
-	  This driver can also be built as a module. If so, the module will be
-	  called i2c-zx2967.
-
 config I2C_FSI
 	tristate "FSI I2C driver"
 	depends on FSI

drivers/i2c/busses/Makefile

@@ -119,7 +119,6 @@ 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
-obj-$(CONFIG_I2C_ZX2967)	+= i2c-zx2967.o
 
 # External I2C/SMBus adapter drivers
 obj-$(CONFIG_I2C_DIOLAN_U2C)	+= i2c-diolan-u2c.o

drivers/i2c/busses/i2c-zx2967.c

-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Copyright (C) 2017 Sanechips Technology Co., Ltd.
- * Copyright 2017 Linaro Ltd.
- *
- * Author: Baoyou Xie <baoyou.xie@linaro.org>
- */
-
-#include <linux/clk.h>
-#include <linux/i2c.h>
-#include <linux/interrupt.h>
-#include <linux/io.h>
-#include <linux/module.h>
-#include <linux/platform_device.h>
-
-#define REG_CMD				0x04
-#define REG_DEVADDR_H			0x0C
-#define REG_DEVADDR_L			0x10
-#define REG_CLK_DIV_FS			0x14
-#define REG_CLK_DIV_HS			0x18
-#define REG_WRCONF			0x1C
-#define REG_RDCONF			0x20
-#define REG_DATA			0x24
-#define REG_STAT			0x28
-
-#define I2C_STOP			0
-#define I2C_MASTER			BIT(0)
-#define I2C_ADDR_MODE_TEN		BIT(1)
-#define I2C_IRQ_MSK_ENABLE		BIT(3)
-#define I2C_RW_READ			BIT(4)
-#define I2C_CMB_RW_EN			BIT(5)
-#define I2C_START			BIT(6)
-
-#define I2C_ADDR_LOW_MASK		GENMASK(6, 0)
-#define I2C_ADDR_LOW_SHIFT		0
-#define I2C_ADDR_HI_MASK		GENMASK(2, 0)
-#define I2C_ADDR_HI_SHIFT		7
-
-#define I2C_WFIFO_RESET			BIT(7)
-#define I2C_RFIFO_RESET			BIT(7)
-
-#define I2C_IRQ_ACK_CLEAR		BIT(7)
-#define I2C_INT_MASK			GENMASK(6, 0)
-
-#define I2C_TRANS_DONE			BIT(0)
-#define I2C_SR_EDEVICE			BIT(1)
-#define I2C_SR_EDATA			BIT(2)
-
-#define I2C_FIFO_MAX			16
-
-#define I2C_TIMEOUT			msecs_to_jiffies(1000)
-
-#define DEV(i2c)			((i2c)->adap.dev.parent)
-
-struct zx2967_i2c {
-	struct i2c_adapter	adap;
-	struct clk		*clk;
-	struct completion	complete;
-	u32			clk_freq;
-	void __iomem		*reg_base;
-	size_t			residue;
-	int			irq;
-	int			msg_rd;
-	u8			*cur_trans;
-	u8			access_cnt;
-	int			error;
-};
-
-static void zx2967_i2c_writel(struct zx2967_i2c *i2c,
-			      u32 val, unsigned long reg)
-{
-	writel_relaxed(val, i2c->reg_base + reg);
-}
-
-static u32 zx2967_i2c_readl(struct zx2967_i2c *i2c, unsigned long reg)
-{
-	return readl_relaxed(i2c->reg_base + reg);
-}
-
-static void zx2967_i2c_writesb(struct zx2967_i2c *i2c,
-			       void *data, unsigned long reg, int len)
-{
-	writesb(i2c->reg_base + reg, data, len);
-}
-
-static void zx2967_i2c_readsb(struct zx2967_i2c *i2c,
-			      void *data, unsigned long reg, int len)
-{
-	readsb(i2c->reg_base + reg, data, len);
-}
-
-static void zx2967_i2c_start_ctrl(struct zx2967_i2c *i2c)
-{
-	u32 status;
-	u32 ctl;
-
-	status = zx2967_i2c_readl(i2c, REG_STAT);
-	status |= I2C_IRQ_ACK_CLEAR;
-	zx2967_i2c_writel(i2c, status, REG_STAT);
-
-	ctl = zx2967_i2c_readl(i2c, REG_CMD);
-	if (i2c->msg_rd)
-		ctl |= I2C_RW_READ;
-	else
-		ctl &= ~I2C_RW_READ;
-	ctl &= ~I2C_CMB_RW_EN;
-	ctl |= I2C_START;
-	zx2967_i2c_writel(i2c, ctl, REG_CMD);
-}
-
-static void zx2967_i2c_flush_fifos(struct zx2967_i2c *i2c)
-{
-	u32 offset;
-	u32 val;
-
-	if (i2c->msg_rd) {
-		offset = REG_RDCONF;
-		val = I2C_RFIFO_RESET;
-	} else {
-		offset = REG_WRCONF;
-		val = I2C_WFIFO_RESET;
-	}
-
-	val |= zx2967_i2c_readl(i2c, offset);
-	zx2967_i2c_writel(i2c, val, offset);
-}
-
-static int zx2967_i2c_empty_rx_fifo(struct zx2967_i2c *i2c, u32 size)
-{
-	u8 val[I2C_FIFO_MAX] = {0};
-	int i;
-
-	if (size > I2C_FIFO_MAX) {
-		dev_err(DEV(i2c), "fifo size %d over the max value %d\n",
-			size, I2C_FIFO_MAX);
-		return -EINVAL;
-	}
-
-	zx2967_i2c_readsb(i2c, val, REG_DATA, size);
-	for (i = 0; i < size; i++) {
-		*i2c->cur_trans++ = val[i];
-		i2c->residue--;
-	}
-
-	barrier();
-
-	return 0;
-}
-
-static int zx2967_i2c_fill_tx_fifo(struct zx2967_i2c *i2c)
-{
-	size_t residue = i2c->residue;
-	u8 *buf = i2c->cur_trans;
-
-	if (residue == 0) {
-		dev_err(DEV(i2c), "residue is %d\n", (int)residue);
-		return -EINVAL;
-	}
-
-	if (residue <= I2C_FIFO_MAX) {
-		zx2967_i2c_writesb(i2c, buf, REG_DATA, residue);
-
-		/* Again update before writing to FIFO to make sure isr sees. */
-		i2c->residue = 0;
-		i2c->cur_trans = NULL;
-	} else {
-		zx2967_i2c_writesb(i2c, buf, REG_DATA, I2C_FIFO_MAX);
-		i2c->residue -= I2C_FIFO_MAX;
-		i2c->cur_trans += I2C_FIFO_MAX;
-	}
-
-	barrier();
-
-	return 0;
-}
-
-static int zx2967_i2c_reset_hardware(struct zx2967_i2c *i2c)
-{
-	u32 val;
-	u32 clk_div;
-
-	val = I2C_MASTER | I2C_IRQ_MSK_ENABLE;
-	zx2967_i2c_writel(i2c, val, REG_CMD);
-
-	clk_div = clk_get_rate(i2c->clk) / i2c->clk_freq - 1;
-	zx2967_i2c_writel(i2c, clk_div, REG_CLK_DIV_FS);
-	zx2967_i2c_writel(i2c, clk_div, REG_CLK_DIV_HS);
-
-	zx2967_i2c_writel(i2c, I2C_FIFO_MAX - 1, REG_WRCONF);
-	zx2967_i2c_writel(i2c, I2C_FIFO_MAX - 1, REG_RDCONF);
-	zx2967_i2c_writel(i2c, 1, REG_RDCONF);
-
-	zx2967_i2c_flush_fifos(i2c);
-
-	return 0;
-}
-
-static void zx2967_i2c_isr_clr(struct zx2967_i2c *i2c)
-{
-	u32 status;
-
-	status = zx2967_i2c_readl(i2c, REG_STAT);
-	status |= I2C_IRQ_ACK_CLEAR;
-	zx2967_i2c_writel(i2c, status, REG_STAT);
-}
-
-static irqreturn_t zx2967_i2c_isr(int irq, void *dev_id)
-{
-	u32 status;
-	struct zx2967_i2c *i2c = (struct zx2967_i2c *)dev_id;
-
-	status = zx2967_i2c_readl(i2c, REG_STAT) & I2C_INT_MASK;
-	zx2967_i2c_isr_clr(i2c);
-
-	if (status & I2C_SR_EDEVICE)
-		i2c->error = -ENXIO;
-	else if (status & I2C_SR_EDATA)
-		i2c->error = -EIO;
-	else if (status & I2C_TRANS_DONE)
-		i2c->error = 0;
-	else
-		goto done;
-
-	complete(&i2c->complete);
-done:
-	return IRQ_HANDLED;
-}
-
-static void zx2967_set_addr(struct zx2967_i2c *i2c, u16 addr)
-{
-	u16 val;
-
-	val = (addr >> I2C_ADDR_LOW_SHIFT) & I2C_ADDR_LOW_MASK;
-	zx2967_i2c_writel(i2c, val, REG_DEVADDR_L);
-
-	val = (addr >> I2C_ADDR_HI_SHIFT) & I2C_ADDR_HI_MASK;
-	zx2967_i2c_writel(i2c, val, REG_DEVADDR_H);
-	if (val)
-		val = zx2967_i2c_readl(i2c, REG_CMD) | I2C_ADDR_MODE_TEN;
-	else
-		val = zx2967_i2c_readl(i2c, REG_CMD) & ~I2C_ADDR_MODE_TEN;
-	zx2967_i2c_writel(i2c, val, REG_CMD);
-}
-
-static int zx2967_i2c_xfer_bytes(struct zx2967_i2c *i2c, u32 bytes)
-{
-	unsigned long time_left;
-	int rd = i2c->msg_rd;
-	int ret;
-
-	reinit_completion(&i2c->complete);
-
-	if (rd) {
-		zx2967_i2c_writel(i2c, bytes - 1, REG_RDCONF);
-	} else {
-		ret = zx2967_i2c_fill_tx_fifo(i2c);
-		if (ret)
-			return ret;
-	}
-
-	zx2967_i2c_start_ctrl(i2c);
-
-	time_left = wait_for_completion_timeout(&i2c->complete,
-						I2C_TIMEOUT);
-	if (time_left == 0)
-		return -ETIMEDOUT;
-
-	if (i2c->error)
-		return i2c->error;
-
-	return rd ? zx2967_i2c_empty_rx_fifo(i2c, bytes) : 0;
-}
-
-static int zx2967_i2c_xfer_msg(struct zx2967_i2c *i2c,
-			       struct i2c_msg *msg)
-{
-	int ret;
-	int i;
-
-	zx2967_i2c_flush_fifos(i2c);
-
-	i2c->cur_trans = msg->buf;
-	i2c->residue = msg->len;
-	i2c->access_cnt = msg->len / I2C_FIFO_MAX;
-	i2c->msg_rd = msg->flags & I2C_M_RD;
-
-	for (i = 0; i < i2c->access_cnt; i++) {
-		ret = zx2967_i2c_xfer_bytes(i2c, I2C_FIFO_MAX);
-		if (ret)
-			return ret;
-	}
-
-	if (i2c->residue > 0) {
-		ret = zx2967_i2c_xfer_bytes(i2c, i2c->residue);
-		if (ret)
-			return ret;
-	}
-
-	i2c->residue = 0;
-	i2c->access_cnt = 0;
-
-	return 0;
-}
-
-static int zx2967_i2c_xfer(struct i2c_adapter *adap,
-			   struct i2c_msg *msgs, int num)
-{
-	struct zx2967_i2c *i2c = i2c_get_adapdata(adap);
-	int ret;
-	int i;
-
-	zx2967_set_addr(i2c, msgs->addr);
-
-	for (i = 0; i < num; i++) {
-		ret = zx2967_i2c_xfer_msg(i2c, &msgs[i]);
-		if (ret)
-			return ret;
-	}
-
-	return num;
-}
-
-static void
-zx2967_smbus_xfer_prepare(struct zx2967_i2c *i2c, u16 addr,
-			  char read_write, u8 command, int size,
-			  union i2c_smbus_data *data)
-{
-	u32 val;
-
-	val = zx2967_i2c_readl(i2c, REG_RDCONF);
-	val |= I2C_RFIFO_RESET;
-	zx2967_i2c_writel(i2c, val, REG_RDCONF);
-	zx2967_set_addr(i2c, addr);
-	val = zx2967_i2c_readl(i2c, REG_CMD);
-	val &= ~I2C_RW_READ;
-	zx2967_i2c_writel(i2c, val, REG_CMD);
-
-	switch (size) {
-	case I2C_SMBUS_BYTE:
-		zx2967_i2c_writel(i2c, command, REG_DATA);
-		break;
-	case I2C_SMBUS_BYTE_DATA:
-		zx2967_i2c_writel(i2c, command, REG_DATA);
-		if (read_write == I2C_SMBUS_WRITE)
-			zx2967_i2c_writel(i2c, data->byte, REG_DATA);
-		break;
-	case I2C_SMBUS_WORD_DATA:
-		zx2967_i2c_writel(i2c, command, REG_DATA);
-		if (read_write == I2C_SMBUS_WRITE) {
-			zx2967_i2c_writel(i2c, (data->word >> 8), REG_DATA);
-			zx2967_i2c_writel(i2c, (data->word & 0xff),
-					  REG_DATA);
-		}
-		break;
-	}
-}
-
-static int zx2967_smbus_xfer_read(struct zx2967_i2c *i2c, int size,
-				  union i2c_smbus_data *data)
-{
-	unsigned long time_left;
-	u8 buf[2];
-	u32 val;
-
-	reinit_completion(&i2c->complete);
-
-	val = zx2967_i2c_readl(i2c, REG_CMD);
-	val |= I2C_CMB_RW_EN;
-	zx2967_i2c_writel(i2c, val, REG_CMD);
-
-	val = zx2967_i2c_readl(i2c, REG_CMD);
-	val |= I2C_START;
-	zx2967_i2c_writel(i2c, val, REG_CMD);
-
-	time_left = wait_for_completion_timeout(&i2c->complete,
-						I2C_TIMEOUT);
-	if (time_left == 0)
-		return -ETIMEDOUT;
-
-	if (i2c->error)
-		return i2c->error;
-
-	switch (size) {
-	case I2C_SMBUS_BYTE:
-	case I2C_SMBUS_BYTE_DATA:
-		val = zx2967_i2c_readl(i2c, REG_DATA);
-		data->byte = val;
-		break;
-	case I2C_SMBUS_WORD_DATA:
-	case I2C_SMBUS_PROC_CALL:
-		buf[0] = zx2967_i2c_readl(i2c, REG_DATA);
-		buf[1] = zx2967_i2c_readl(i2c, REG_DATA);
-		data->word = (buf[0] << 8) | buf[1];
-		break;
-	default:
-		return -EOPNOTSUPP;
-	}
-
-	return 0;
-}
-
-static int zx2967_smbus_xfer_write(struct zx2967_i2c *i2c)
-{
-	unsigned long time_left;
-	u32 val;
-
-	reinit_completion(&i2c->complete);
-	val = zx2967_i2c_readl(i2c, REG_CMD);
-	val |= I2C_START;
-	zx2967_i2c_writel(i2c, val, REG_CMD);
-
-	time_left = wait_for_completion_timeout(&i2c->complete,
-						I2C_TIMEOUT);
-	if (time_left == 0)
-		return -ETIMEDOUT;
-
-	if (i2c->error)
-		return i2c->error;
-
-	return 0;
-}
-
-static int zx2967_smbus_xfer(struct i2c_adapter *adap, u16 addr,
-			     unsigned short flags, char read_write,
-			     u8 command, int size, union i2c_smbus_data *data)
-{
-	struct zx2967_i2c *i2c = i2c_get_adapdata(adap);
-
-	if (size == I2C_SMBUS_QUICK)
-		read_write = I2C_SMBUS_WRITE;
-
-	switch (size) {
-	case I2C_SMBUS_QUICK:
-	case I2C_SMBUS_BYTE:
-	case I2C_SMBUS_BYTE_DATA:
-	case I2C_SMBUS_WORD_DATA:
-		zx2967_smbus_xfer_prepare(i2c, addr, read_write,
-					  command, size, data);
-		break;
-	default:
-		return -EOPNOTSUPP;
-	}
-
-	if (read_write == I2C_SMBUS_READ)
-		return zx2967_smbus_xfer_read(i2c, size, data);
-
-	return zx2967_smbus_xfer_write(i2c);
-}
-
-static u32 zx2967_i2c_func(struct i2c_adapter *adap)
-{
-	return I2C_FUNC_I2C |
-	       I2C_FUNC_SMBUS_QUICK |
-	       I2C_FUNC_SMBUS_BYTE |
-	       I2C_FUNC_SMBUS_BYTE_DATA |
-	       I2C_FUNC_SMBUS_WORD_DATA |
-	       I2C_FUNC_SMBUS_BLOCK_DATA |
-	       I2C_FUNC_SMBUS_PROC_CALL |
-	       I2C_FUNC_SMBUS_I2C_BLOCK;
-}
-
-static int __maybe_unused zx2967_i2c_suspend(struct device *dev)
-{
-	struct zx2967_i2c *i2c = dev_get_drvdata(dev);
-
-	i2c_mark_adapter_suspended(&i2c->adap);
-	clk_disable_unprepare(i2c->clk);
-
-	return 0;
-}
-
-static int __maybe_unused zx2967_i2c_resume(struct device *dev)
-{
-	struct zx2967_i2c *i2c = dev_get_drvdata(dev);
-
-	clk_prepare_enable(i2c->clk);
-	i2c_mark_adapter_resumed(&i2c->adap);
-
-	return 0;
-}
-
-static SIMPLE_DEV_PM_OPS(zx2967_i2c_dev_pm_ops,
-			 zx2967_i2c_suspend, zx2967_i2c_resume);
-
-static const struct i2c_algorithm zx2967_i2c_algo = {
-	.master_xfer = zx2967_i2c_xfer,
-	.smbus_xfer = zx2967_smbus_xfer,
-	.functionality = zx2967_i2c_func,
-};
-
-static const struct i2c_adapter_quirks zx2967_i2c_quirks = {
-	.flags = I2C_AQ_NO_ZERO_LEN,
-};
-
-static const struct of_device_id zx2967_i2c_of_match[] = {
-	{ .compatible = "zte,zx296718-i2c", },
-	{ },
-};
-MODULE_DEVICE_TABLE(of, zx2967_i2c_of_match);
-
-static int zx2967_i2c_probe(struct platform_device *pdev)
-{
-	struct zx2967_i2c *i2c;
-	void __iomem *reg_base;
-	struct clk *clk;
-	int ret;
-
-	i2c = devm_kzalloc(&pdev->dev, sizeof(*i2c), GFP_KERNEL);
-	if (!i2c)
-		return -ENOMEM;
-
-	reg_base = devm_platform_ioremap_resource(pdev, 0);
-	if (IS_ERR(reg_base))
-		return PTR_ERR(reg_base);
-
-	clk = devm_clk_get(&pdev->dev, NULL);
-	if (IS_ERR(clk)) {
-		dev_err(&pdev->dev, "missing controller clock");
-		return PTR_ERR(clk);
-	}
-
-	ret = clk_prepare_enable(clk);
-	if (ret) {
-		dev_err(&pdev->dev, "failed to enable i2c_clk\n");
-		return ret;
-	}
-
-	ret = device_property_read_u32(&pdev->dev, "clock-frequency",
-				       &i2c->clk_freq);
-	if (ret) {
-		dev_err(&pdev->dev, "missing clock-frequency");
-		return ret;
-	}
-
-	ret = platform_get_irq(pdev, 0);
-	if (ret < 0)
-		return ret;
-
-	i2c->irq = ret;
-	i2c->reg_base = reg_base;
-	i2c->clk = clk;
-
-	init_completion(&i2c->complete);
-	platform_set_drvdata(pdev, i2c);
-
-	ret = zx2967_i2c_reset_hardware(i2c);
-	if (ret) {
-		dev_err(&pdev->dev, "failed to initialize i2c controller\n");
-		goto err_clk_unprepare;
-	}
-
-	ret = devm_request_irq(&pdev->dev, i2c->irq,
-			zx2967_i2c_isr, 0, dev_name(&pdev->dev), i2c);
-	if (ret) {
-		dev_err(&pdev->dev, "failed to request irq %i\n", i2c->irq);
-		goto err_clk_unprepare;
-	}
-
-	i2c_set_adapdata(&i2c->adap, i2c);
-	strlcpy(i2c->adap.name, "zx2967 i2c adapter",
-		sizeof(i2c->adap.name));
-	i2c->adap.algo = &zx2967_i2c_algo;
-	i2c->adap.quirks = &zx2967_i2c_quirks;
-	i2c->adap.nr = pdev->id;
-	i2c->adap.dev.parent = &pdev->dev;
-	i2c->adap.dev.of_node = pdev->dev.of_node;
-
-	ret = i2c_add_numbered_adapter(&i2c->adap);
-	if (ret)
-		goto err_clk_unprepare;
-
-	return 0;
-
-err_clk_unprepare:
-	clk_disable_unprepare(i2c->clk);
-	return ret;
-}
-
-static int zx2967_i2c_remove(struct platform_device *pdev)
-{
-	struct zx2967_i2c *i2c = platform_get_drvdata(pdev);
-
-	i2c_del_adapter(&i2c->adap);
-	clk_disable_unprepare(i2c->clk);
-
-	return 0;
-}
-
-static struct platform_driver zx2967_i2c_driver = {
-	.probe	= zx2967_i2c_probe,
-	.remove	= zx2967_i2c_remove,
-	.driver	= {
-		.name  = "zx2967_i2c",
-		.of_match_table = zx2967_i2c_of_match,
-		.pm = &zx2967_i2c_dev_pm_ops,
-	},
-};
-module_platform_driver(zx2967_i2c_driver);
-
-MODULE_AUTHOR("Baoyou Xie <baoyou.xie@linaro.org>");
-MODULE_DESCRIPTION("ZTE ZX2967 I2C Bus Controller driver");
-MODULE_LICENSE("GPL v2");