i2c: PA Semi SMBus driver (beb58aa3) · Commits · e / devices / android_kernel_samsung_smdk4412

MAINTAINERS

+6 −0

Original line number	Original line	Diff line number	Diff line
	@@ -2523,6 +2523,12 @@ M: olof@lixom.net
	L: netdev@vger.kernel.org		L: netdev@vger.kernel.org
	S: Maintained		S: Maintained

			PA SEMI SMBUS DRIVER
			P: Olof Johansson
			M: olof@lixom.net
			L: i2c@lm-sensors.org
			S: Maintained

	PARALLEL PORT SUPPORT		PARALLEL PORT SUPPORT
	P: Phil Blundell		P: Phil Blundell
	M: philb@gnu.org		M: philb@gnu.org

drivers/i2c/busses/Kconfig

+7 −0

Original line number	Original line	Diff line number	Diff line
	@@ -342,6 +342,13 @@ config I2C_PARPORT_LIGHT
	This support is also available as a module. If so, the module		This support is also available as a module. If so, the module
	will be called i2c-parport-light.		will be called i2c-parport-light.

			config I2C_PASEMI
			tristate "PA Semi SMBus interface"
			# depends on PPC_PASEMI && I2C && PCI
			depends on I2C && PCI
			help
			Supports the PA Semi PWRficient on-chip SMBus interfaces.

	config I2C_PROSAVAGE		config I2C_PROSAVAGE
	tristate "S3/VIA (Pro)Savage"		tristate "S3/VIA (Pro)Savage"
	depends on I2C && PCI		depends on I2C && PCI

drivers/i2c/busses/Makefile

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Original line number	Original line	Diff line number	Diff line
	@@ -27,6 +27,7 @@ obj-$(CONFIG_I2C_OCORES) += i2c-ocores.o
	obj-$(CONFIG_I2C_OMAP) += i2c-omap.o		obj-$(CONFIG_I2C_OMAP) += i2c-omap.o
	obj-$(CONFIG_I2C_PARPORT) += i2c-parport.o		obj-$(CONFIG_I2C_PARPORT) += i2c-parport.o
	obj-$(CONFIG_I2C_PARPORT_LIGHT) += i2c-parport-light.o		obj-$(CONFIG_I2C_PARPORT_LIGHT) += i2c-parport-light.o
			obj-$(CONFIG_I2C_PASEMI) += i2c-pasemi.o
	obj-$(CONFIG_I2C_PCA_ISA) += i2c-pca-isa.o		obj-$(CONFIG_I2C_PCA_ISA) += i2c-pca-isa.o
	obj-$(CONFIG_I2C_PIIX4) += i2c-piix4.o		obj-$(CONFIG_I2C_PIIX4) += i2c-piix4.o
	obj-$(CONFIG_I2C_PNX) += i2c-pnx.o		obj-$(CONFIG_I2C_PNX) += i2c-pnx.o

drivers/i2c/busses/i2c-pasemi.c

0 → 100644

+426 −0

Original line number	Original line	Diff line number	Diff line
			/*
			* Copyright (C) 2006-2007 PA Semi, Inc
			*
			* SMBus host driver for PA Semi PWRficient
			*
			* This program is free software; you can redistribute it and/or modify
			* it under the terms of the GNU General Public License version 2 as
			* published by the Free Software Foundation.
			*
			* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
			*/

			#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 <asm/io.h>

			static struct pci_driver pasemi_smb_driver;

			struct pasemi_smbus {
			struct pci_dev *dev;
			struct i2c_adapter adapter;
			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 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->dev, "smbus write reg %lx val %08x\n",
			smbus->base + reg, val);
			outl(val, smbus->base + reg);
			}

			static inline int reg_read(struct pasemi_smbus *smbus, int reg)
			{
			int ret;
			ret = inl(smbus->base + reg);
			dev_dbg(&smbus->dev->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 unsigned 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);
			}

			if (timeout < 0) {
			dev_warn(&smbus->dev->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 \| (msg->addr << 1) \| read);

			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] \|
			(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 + 1) \| 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 + 1) \| 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 __devinit 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;
			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->adapter.owner = THIS_MODULE;
			snprintf(smbus->adapter.name, I2C_NAME_SIZE,
			"PA Semi SMBus adapter at 0x%lx", smbus->base);
			smbus->adapter.class = I2C_CLASS_HWMON;
			smbus->adapter.algo = &smbus_algorithm;
			smbus->adapter.algo_data = smbus;

			/* set up the driverfs linkage to our parent device */
			smbus->adapter.dev.parent = &dev->dev;

			reg_write(smbus, REG_CTL, (CTL_MTR \| CTL_MRR \|
			(CLK_100K_DIV & CTL_CLK_M)));

			error = i2c_add_adapter(&smbus->adapter);
			if (error)
			goto out_release_region;

			pci_set_drvdata(dev, smbus);

			return 0;

			out_release_region:
			release_region(smbus->base, smbus->size);
			out_kfree:
			kfree(smbus);
			return error;
			}

			static void __devexit pasemi_smb_remove(struct pci_dev *dev)
			{
			struct pasemi_smbus *smbus = pci_get_drvdata(dev);

			i2c_del_adapter(&smbus->adapter);
			release_region(smbus->base, smbus->size);
			kfree(smbus);
			}

			static 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 = __devexit_p(pasemi_smb_remove),
			};

			static int __init pasemi_smb_init(void)
			{
			return pci_register_driver(&pasemi_smb_driver);
			}

			static void __exit pasemi_smb_exit(void)
			{
			pci_unregister_driver(&pasemi_smb_driver);
			}

			MODULE_LICENSE("GPL");
			MODULE_AUTHOR ("Olof Johansson <olof@lixom.net>");
			MODULE_DESCRIPTION("PA Semi PWRficient SMBus driver");

			module_init(pasemi_smb_init);
			module_exit(pasemi_smb_exit);