i2c: pasemi: Split pci driver to its own file

Split off the PCI driver so that we can reuse common code for the
platform driver.

Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Sven Peter <sven@svenpeter.dev>
Acked-by: Olof Johansson <olof@lixom.net>
Tested-by: Christian Zigotzky <chzigotzky@xenosoft.de>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

1 files changed, 0 insertions, 430 deletions

diff --git a/drivers/i2c/busses/i2c-pasemi.c b/drivers/i2c/busses/i2c-pasemi.c
deleted file mode 100644
index baf338149673..000000000000
--- a/drivers/i2c/busses/i2c-pasemi.c
+++ /dev/null
@@ -1,430 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Copyright (C) 2006-2007 PA Semi, Inc
- *
- * SMBus host driver for PA Semi PWRficient
- */
-
-#include <linux/module.h>
-#include <linux/pci.h>
-#include <linux/kernel.h>
-#include <linux/stddef.h>
-#include <linux/sched.h>
-#include <linux/i2c.h>
-#include <linux/delay.h>
-#include <linux/slab.h>
-#include <linux/io.h>
-
-static struct pci_driver pasemi_smb_driver;
-
-struct pasemi_smbus {
-	struct device           *dev;
-	struct i2c_adapter	 adapter;
-	void __iomem		*ioaddr;
-	unsigned long		 base;
-	int			 size;
-};
-
-/* Register offsets */
-#define REG_MTXFIFO	0x00
-#define REG_MRXFIFO	0x04
-#define REG_SMSTA	0x14
-#define REG_CTL		0x1c
-
-/* Register defs */
-#define MTXFIFO_READ	0x00000400
-#define MTXFIFO_STOP	0x00000200
-#define MTXFIFO_START	0x00000100
-#define MTXFIFO_DATA_M	0x000000ff
-
-#define MRXFIFO_EMPTY	0x00000100
-#define MRXFIFO_DATA_M	0x000000ff
-
-#define SMSTA_XEN	0x08000000
-#define SMSTA_MTN	0x00200000
-
-#define CTL_MRR		0x00000400
-#define CTL_MTR		0x00000200
-#define CTL_CLK_M	0x000000ff
-
-#define CLK_100K_DIV	84
-#define CLK_400K_DIV	21
-
-static inline void reg_write(struct pasemi_smbus *smbus, int reg, int val)
-{
-	dev_dbg(smbus->dev, "smbus write reg %lx val %08x\n",
-		smbus->base + reg, val);
-	iowrite32(val, smbus->ioaddr + reg);
-}
-
-static inline int reg_read(struct pasemi_smbus *smbus, int reg)
-{
-	int ret;
-	ret = ioread32(smbus->ioaddr + reg);
-	dev_dbg(smbus->dev, "smbus read reg %lx val %08x\n",
-		smbus->base + reg, ret);
-	return ret;
-}
-
-#define TXFIFO_WR(smbus, reg)	reg_write((smbus), REG_MTXFIFO, (reg))
-#define RXFIFO_RD(smbus)	reg_read((smbus), REG_MRXFIFO)
-
-static void pasemi_smb_clear(struct pasemi_smbus *smbus)
-{
-	unsigned int status;
-
-	status = reg_read(smbus, REG_SMSTA);
-	reg_write(smbus, REG_SMSTA, status);
-}
-
-static int pasemi_smb_waitready(struct pasemi_smbus *smbus)
-{
-	int timeout = 10;
-	unsigned int status;
-
-	status = reg_read(smbus, REG_SMSTA);
-
-	while (!(status & SMSTA_XEN) && timeout--) {
-		msleep(1);
-		status = reg_read(smbus, REG_SMSTA);
-	}
-
-	/* Got NACK? */
-	if (status & SMSTA_MTN)
-		return -ENXIO;
-
-	if (timeout < 0) {
-		dev_warn(smbus->dev, "Timeout, status 0x%08x\n", status);
-		reg_write(smbus, REG_SMSTA, status);
-		return -ETIME;
-	}
-
-	/* Clear XEN */
-	reg_write(smbus, REG_SMSTA, SMSTA_XEN);
-
-	return 0;
-}
-
-static int pasemi_i2c_xfer_msg(struct i2c_adapter *adapter,
-			       struct i2c_msg *msg, int stop)
-{
-	struct pasemi_smbus *smbus = adapter->algo_data;
-	int read, i, err;
-	u32 rd;
-
-	read = msg->flags & I2C_M_RD ? 1 : 0;
-
-	TXFIFO_WR(smbus, MTXFIFO_START | i2c_8bit_addr_from_msg(msg));
-
-	if (read) {
-		TXFIFO_WR(smbus, msg->len | MTXFIFO_READ |
-				 (stop ? MTXFIFO_STOP : 0));
-
-		err = pasemi_smb_waitready(smbus);
-		if (err)
-			goto reset_out;
-
-		for (i = 0; i < msg->len; i++) {
-			rd = RXFIFO_RD(smbus);
-			if (rd & MRXFIFO_EMPTY) {
-				err = -ENODATA;
-				goto reset_out;
-			}
-			msg->buf[i] = rd & MRXFIFO_DATA_M;
-		}
-	} else {
-		for (i = 0; i < msg->len - 1; i++)
-			TXFIFO_WR(smbus, msg->buf[i]);
-
-		TXFIFO_WR(smbus, msg->buf[msg->len-1] |
-			  (stop ? MTXFIFO_STOP : 0));
-	}
-
-	return 0;
-
- reset_out:
-	reg_write(smbus, REG_CTL, (CTL_MTR | CTL_MRR |
-		  (CLK_100K_DIV & CTL_CLK_M)));
-	return err;
-}
-
-static int pasemi_i2c_xfer(struct i2c_adapter *adapter,
-			   struct i2c_msg *msgs, int num)
-{
-	struct pasemi_smbus *smbus = adapter->algo_data;
-	int ret, i;
-
-	pasemi_smb_clear(smbus);
-
-	ret = 0;
-
-	for (i = 0; i < num && !ret; i++)
-		ret = pasemi_i2c_xfer_msg(adapter, &msgs[i], (i == (num - 1)));
-
-	return ret ? ret : num;
-}
-
-static int pasemi_smb_xfer(struct i2c_adapter *adapter,
-		u16 addr, unsigned short flags, char read_write, u8 command,
-		int size, union i2c_smbus_data *data)
-{
-	struct pasemi_smbus *smbus = adapter->algo_data;
-	unsigned int rd;
-	int read_flag, err;
-	int len = 0, i;
-
-	/* All our ops take 8-bit shifted addresses */
-	addr <<= 1;
-	read_flag = read_write == I2C_SMBUS_READ;
-
-	pasemi_smb_clear(smbus);
-
-	switch (size) {
-	case I2C_SMBUS_QUICK:
-		TXFIFO_WR(smbus, addr | read_flag | MTXFIFO_START |
-			  MTXFIFO_STOP);
-		break;
-	case I2C_SMBUS_BYTE:
-		TXFIFO_WR(smbus, addr | read_flag | MTXFIFO_START);
-		if (read_write)
-			TXFIFO_WR(smbus, 1 | MTXFIFO_STOP | MTXFIFO_READ);
-		else
-			TXFIFO_WR(smbus, MTXFIFO_STOP | command);
-		break;
-	case I2C_SMBUS_BYTE_DATA:
-		TXFIFO_WR(smbus, addr | MTXFIFO_START);
-		TXFIFO_WR(smbus, command);
-		if (read_write) {
-			TXFIFO_WR(smbus, addr | I2C_SMBUS_READ | MTXFIFO_START);
-			TXFIFO_WR(smbus, 1 | MTXFIFO_READ | MTXFIFO_STOP);
-		} else {
-			TXFIFO_WR(smbus, MTXFIFO_STOP | data->byte);
-		}
-		break;
-	case I2C_SMBUS_WORD_DATA:
-		TXFIFO_WR(smbus, addr | MTXFIFO_START);
-		TXFIFO_WR(smbus, command);
-		if (read_write) {
-			TXFIFO_WR(smbus, addr | I2C_SMBUS_READ | MTXFIFO_START);
-			TXFIFO_WR(smbus, 2 | MTXFIFO_READ | MTXFIFO_STOP);
-		} else {
-			TXFIFO_WR(smbus, data->word & MTXFIFO_DATA_M);
-			TXFIFO_WR(smbus, MTXFIFO_STOP | (data->word >> 8));
-		}
-		break;
-	case I2C_SMBUS_BLOCK_DATA:
-		TXFIFO_WR(smbus, addr | MTXFIFO_START);
-		TXFIFO_WR(smbus, command);
-		if (read_write) {
-			TXFIFO_WR(smbus, addr | I2C_SMBUS_READ | MTXFIFO_START);
-			TXFIFO_WR(smbus, 1 | MTXFIFO_READ);
-			rd = RXFIFO_RD(smbus);
-			len = min_t(u8, (rd & MRXFIFO_DATA_M),
-				    I2C_SMBUS_BLOCK_MAX);
-			TXFIFO_WR(smbus, len | MTXFIFO_READ |
-					 MTXFIFO_STOP);
-		} else {
-			len = min_t(u8, data->block[0], I2C_SMBUS_BLOCK_MAX);
-			TXFIFO_WR(smbus, len);
-			for (i = 1; i < len; i++)
-				TXFIFO_WR(smbus, data->block[i]);
-			TXFIFO_WR(smbus, data->block[len] | MTXFIFO_STOP);
-		}
-		break;
-	case I2C_SMBUS_PROC_CALL:
-		read_write = I2C_SMBUS_READ;
-		TXFIFO_WR(smbus, addr | MTXFIFO_START);
-		TXFIFO_WR(smbus, command);
-		TXFIFO_WR(smbus, data->word & MTXFIFO_DATA_M);
-		TXFIFO_WR(smbus, (data->word >> 8) & MTXFIFO_DATA_M);
-		TXFIFO_WR(smbus, addr | I2C_SMBUS_READ | MTXFIFO_START);
-		TXFIFO_WR(smbus, 2 | MTXFIFO_STOP | MTXFIFO_READ);
-		break;
-	case I2C_SMBUS_BLOCK_PROC_CALL:
-		len = min_t(u8, data->block[0], I2C_SMBUS_BLOCK_MAX - 1);
-		read_write = I2C_SMBUS_READ;
-		TXFIFO_WR(smbus, addr | MTXFIFO_START);
-		TXFIFO_WR(smbus, command);
-		TXFIFO_WR(smbus, len);
-		for (i = 1; i <= len; i++)
-			TXFIFO_WR(smbus, data->block[i]);
-		TXFIFO_WR(smbus, addr | I2C_SMBUS_READ);
-		TXFIFO_WR(smbus, MTXFIFO_READ | 1);
-		rd = RXFIFO_RD(smbus);
-		len = min_t(u8, (rd & MRXFIFO_DATA_M),
-			    I2C_SMBUS_BLOCK_MAX - len);
-		TXFIFO_WR(smbus, len | MTXFIFO_READ | MTXFIFO_STOP);
-		break;
-
-	default:
-		dev_warn(&adapter->dev, "Unsupported transaction %d\n", size);
-		return -EINVAL;
-	}
-
-	err = pasemi_smb_waitready(smbus);
-	if (err)
-		goto reset_out;
-
-	if (read_write == I2C_SMBUS_WRITE)
-		return 0;
-
-	switch (size) {
-	case I2C_SMBUS_BYTE:
-	case I2C_SMBUS_BYTE_DATA:
-		rd = RXFIFO_RD(smbus);
-		if (rd & MRXFIFO_EMPTY) {
-			err = -ENODATA;
-			goto reset_out;
-		}
-		data->byte = rd & MRXFIFO_DATA_M;
-		break;
-	case I2C_SMBUS_WORD_DATA:
-	case I2C_SMBUS_PROC_CALL:
-		rd = RXFIFO_RD(smbus);
-		if (rd & MRXFIFO_EMPTY) {
-			err = -ENODATA;
-			goto reset_out;
-		}
-		data->word = rd & MRXFIFO_DATA_M;
-		rd = RXFIFO_RD(smbus);
-		if (rd & MRXFIFO_EMPTY) {
-			err = -ENODATA;
-			goto reset_out;
-		}
-		data->word |= (rd & MRXFIFO_DATA_M) << 8;
-		break;
-	case I2C_SMBUS_BLOCK_DATA:
-	case I2C_SMBUS_BLOCK_PROC_CALL:
-		data->block[0] = len;
-		for (i = 1; i <= len; i ++) {
-			rd = RXFIFO_RD(smbus);
-			if (rd & MRXFIFO_EMPTY) {
-				err = -ENODATA;
-				goto reset_out;
-			}
-			data->block[i] = rd & MRXFIFO_DATA_M;
-		}
-		break;
-	}
-
-	return 0;
-
- reset_out:
-	reg_write(smbus, REG_CTL, (CTL_MTR | CTL_MRR |
-		  (CLK_100K_DIV & CTL_CLK_M)));
-	return err;
-}
-
-static u32 pasemi_smb_func(struct i2c_adapter *adapter)
-{
-	return 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_BLOCK_PROC_CALL | I2C_FUNC_I2C;
-}
-
-static const struct i2c_algorithm smbus_algorithm = {
-	.master_xfer	= pasemi_i2c_xfer,
-	.smbus_xfer	= pasemi_smb_xfer,
-	.functionality	= pasemi_smb_func,
-};
-
-static int pasemi_i2c_common_probe(struct pasemi_smbus *smbus)
-{
-	int error;
-
-	smbus->adapter.owner = THIS_MODULE;
-	snprintf(smbus->adapter.name, sizeof(smbus->adapter.name),
-		 "PA Semi SMBus adapter (%s)", dev_name(smbus->dev));
-	smbus->adapter.class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
-	smbus->adapter.algo = &smbus_algorithm;
-	smbus->adapter.algo_data = smbus;
-
-	/* set up the sysfs linkage to our parent device */
-	smbus->adapter.dev.parent = smbus->dev;
-
-	reg_write(smbus, REG_CTL, (CTL_MTR | CTL_MRR |
-		  (CLK_100K_DIV & CTL_CLK_M)));
-
-	error = i2c_add_adapter(&smbus->adapter);
-	if (error)
-		return error;
-
-	return 0;
-}
-
-static int pasemi_smb_probe(struct pci_dev *dev,
-				      const struct pci_device_id *id)
-{
-	struct pasemi_smbus *smbus;
-	int error;
-
-	if (!(pci_resource_flags(dev, 0) & IORESOURCE_IO))
-		return -ENODEV;
-
-	smbus = kzalloc(sizeof(struct pasemi_smbus), GFP_KERNEL);
-	if (!smbus)
-		return -ENOMEM;
-
-	smbus->dev = &dev->dev;
-	smbus->base = pci_resource_start(dev, 0);
-	smbus->size = pci_resource_len(dev, 0);
-
-	if (!request_region(smbus->base, smbus->size,
-			    pasemi_smb_driver.name)) {
-		error = -EBUSY;
-		goto out_kfree;
-	}
-
-	smbus->ioaddr = pci_iomap(dev, 0, 0);
-	if (!smbus->ioaddr) {
-		error = -EBUSY;
-		goto out_release_region;
-	}
-
-	int error = pasemi_i2c_common_probe(smbus);
-	if (error)
-		goto out_ioport_unmap;
-
-	pci_set_drvdata(dev, smbus);
-
-	return 0;
-
- out_ioport_unmap:
-	pci_iounmap(dev, smbus->ioaddr);
- out_release_region:
-	release_region(smbus->base, smbus->size);
- out_kfree:
-	kfree(smbus);
-	return error;
-}
-
-static void pasemi_smb_remove(struct pci_dev *dev)
-{
-	struct pasemi_smbus *smbus = pci_get_drvdata(dev);
-
-	i2c_del_adapter(&smbus->adapter);
-	pci_iounmap(dev, smbus->ioaddr);
-	release_region(smbus->base, smbus->size);
-	kfree(smbus);
-}
-
-static const struct pci_device_id pasemi_smb_ids[] = {
-	{ PCI_DEVICE(0x1959, 0xa003) },
-	{ 0, }
-};
-
-MODULE_DEVICE_TABLE(pci, pasemi_smb_ids);
-
-static struct pci_driver pasemi_smb_driver = {
-	.name		= "i2c-pasemi",
-	.id_table	= pasemi_smb_ids,
-	.probe		= pasemi_smb_probe,
-	.remove		= pasemi_smb_remove,
-};
-
-module_pci_driver(pasemi_smb_driver);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR ("Olof Johansson <olof@lixom.net>");
-MODULE_DESCRIPTION("PA Semi PWRficient SMBus driver");