i2c: remove i2c-intel-mid driver

Nowadays we have i2c-designware driver in kernel. It is a successor of the previously developed i2c-intel-mid. So, we could easily remove old driver from the tree.

Signed-off-by Andy Shevchenko <andriy.shevchenko-VuQAYsv1563Yd54FQh9/[email protected]>

Cc Ben Dooks <[email protected]>

Cc Dirk Brandewie <[email protected]>

---
 drivers/i2c/busses/Kconfig         |   10 -
 drivers/i2c/busses/Makefile        |    1 -
 drivers/i2c/busses/i2c-intel-mid.c | 1135 ------------------------------------
 3 files changed, 0 insertions(+), 1146 deletions(-)
 delete mode 100644 drivers/i2c/busses/i2c-intel-mid.c

drivers/i2c/busses/Kconfig +0 -10

index a3afac4..87752867 100644
@@ -409,16 +409,6 @@ config I2C_IMX
 	  This driver can also be built as a module.  If so, the module
 	  will be called i2c-imx.
 
-config I2C_INTEL_MID
-	tristate "Intel Moorestown/Medfield Platform I2C controller"
-	depends on PCI
-	help
-	  Say Y here if you have an Intel Moorestown/Medfield platform I2C
-	  controller.
-
-	  This support is also available as a module. If so, the module
-	  will be called i2c-intel-mid.
-
 config I2C_IOP3XX
 	tristate "Intel IOPx3xx and IXP4xx on-chip I2C interface"
 	depends on ARCH_IOP32X || ARCH_IOP33X || ARCH_IXP4XX || ARCH_IOP13XX

drivers/i2c/busses/Makefile +0 -1

index fba6da6..04e4636 100644
@@ -41,7 +41,6 @@ obj-$(CONFIG_I2C_GPIO)		+= i2c-gpio.o
 obj-$(CONFIG_I2C_HIGHLANDER)	+= i2c-highlander.o
 obj-$(CONFIG_I2C_IBM_IIC)	+= i2c-ibm_iic.o
 obj-$(CONFIG_I2C_IMX)		+= i2c-imx.o
-obj-$(CONFIG_I2C_INTEL_MID)	+= i2c-intel-mid.o
 obj-$(CONFIG_I2C_IOP3XX)	+= i2c-iop3xx.o
 obj-$(CONFIG_I2C_IXP2000)	+= i2c-ixp2000.o
 obj-$(CONFIG_I2C_MPC)		+= i2c-mpc.o

drivers/i2c/busses/i2c-intel-mid.c deleted +0 -1135

deleted file mode 100644
index e828ac8..0000000
@@ -1,1135 +0,0 @@
-/*
- * Support for Moorestown/Medfield I2C chip
- *
- * Copyright (c) 2009 Intel Corporation.
- * Copyright (c) 2009 Synopsys. Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License, version
- * 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope 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., 51
- * Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
- *
- */
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/err.h>
-#include <linux/slab.h>
-#include <linux/stat.h>
-#include <linux/delay.h>
-#include <linux/i2c.h>
-#include <linux/init.h>
-#include <linux/pci.h>
-#include <linux/interrupt.h>
-#include <linux/pm_runtime.h>
-#include <linux/io.h>
-
-#define DRIVER_NAME	"i2c-intel-mid"
-#define VERSION		"Version 0.5ac2"
-#define PLATFORM	"Moorestown/Medfield"
-
-/* Tables use: 0 Moorestown, 1 Medfield */
-#define NUM_PLATFORMS	2
-enum platform_enum {
-	MOORESTOWN = 0,
-	MEDFIELD = 1,
-};
-
-enum mid_i2c_status {
-	STATUS_IDLE = 0,
-	STATUS_READ_START,
-	STATUS_READ_IN_PROGRESS,
-	STATUS_READ_SUCCESS,
-	STATUS_WRITE_START,
-	STATUS_WRITE_SUCCESS,
-	STATUS_XFER_ABORT,
-	STATUS_STANDBY
-};
-
-/**
- * struct intel_mid_i2c_private	- per device I²C context
- * @adap: core i2c layer adapter information
- * @dev: device reference for power management
- * @base: register base
- * @speed: speed mode for this port
- * @complete: completion object for transaction wait
- * @abort: reason for last abort
- * @rx_buf: pointer into working receive buffer
- * @rx_buf_len: receive buffer length
- * @status: adapter state machine
- * @msg: the message we are currently processing
- * @platform: the MID device type we are part of
- * @lock: transaction serialization
- *
- * We allocate one of these per device we discover, it holds the core
- * i2c layer objects and the data we need to track privately.
- */
-struct intel_mid_i2c_private {
-	struct i2c_adapter adap;
-	struct device *dev;
-	void __iomem *base;
-	int speed;
-	struct completion complete;
-	int abort;
-	u8 *rx_buf;
-	int rx_buf_len;
-	enum mid_i2c_status status;
-	struct i2c_msg *msg;
-	enum platform_enum platform;
-	struct mutex lock;
-};
-
-#define NUM_SPEEDS		3
-
-#define ACTIVE			0
-#define STANDBY			1
-
-
-/* Control register */
-#define IC_CON			0x00
-#define SLV_DIS			(1 << 6)	/* Disable slave mode */
-#define RESTART			(1 << 5)	/* Send a Restart condition */
-#define	ADDR_10BIT		(1 << 4)	/* 10-bit addressing */
-#define	STANDARD_MODE		(1 << 1)	/* standard mode */
-#define FAST_MODE		(2 << 1)	/* fast mode */
-#define HIGH_MODE		(3 << 1)	/* high speed mode */
-#define	MASTER_EN		(1 << 0)	/* Master mode */
-
-/* Target address register */
-#define IC_TAR			0x04
-#define IC_TAR_10BIT_ADDR	(1 << 12)	/* 10-bit addressing */
-#define IC_TAR_SPECIAL		(1 << 11)	/* Perform special I2C cmd */
-#define IC_TAR_GC_OR_START	(1 << 10)	/* 0: Gerneral Call Address */
-						/* 1: START BYTE */
-/* Slave Address Register */
-#define IC_SAR			0x08		/* Not used in Master mode */
-
-/* High Speed Master Mode Code Address Register */
-#define IC_HS_MADDR		0x0c
-
-/* Rx/Tx Data Buffer and Command Register */
-#define IC_DATA_CMD		0x10
-#define IC_RD			(1 << 8)	/* 1: Read 0: Write */
-
-/* Standard Speed Clock SCL High Count Register */
-#define IC_SS_SCL_HCNT		0x14
-
-/* Standard Speed Clock SCL Low Count Register */
-#define IC_SS_SCL_LCNT		0x18
-
-/* Fast Speed Clock SCL High Count Register */
-#define IC_FS_SCL_HCNT		0x1c
-
-/* Fast Spedd Clock SCL Low Count Register */
-#define IC_FS_SCL_LCNT		0x20
-
-/* High Speed Clock SCL High Count Register */
-#define IC_HS_SCL_HCNT		0x24
-
-/* High Speed Clock SCL Low Count Register */
-#define IC_HS_SCL_LCNT		0x28
-
-/* Interrupt Status Register */
-#define IC_INTR_STAT		0x2c		/* Read only */
-#define R_GEN_CALL		(1 << 11)
-#define R_START_DET		(1 << 10)
-#define R_STOP_DET		(1 << 9)
-#define R_ACTIVITY		(1 << 8)
-#define R_RX_DONE		(1 << 7)
-#define	R_TX_ABRT		(1 << 6)
-#define R_RD_REQ		(1 << 5)
-#define R_TX_EMPTY		(1 << 4)
-#define R_TX_OVER		(1 << 3)
-#define	R_RX_FULL		(1 << 2)
-#define	R_RX_OVER		(1 << 1)
-#define R_RX_UNDER		(1 << 0)
-
-/* Interrupt Mask Register */
-#define IC_INTR_MASK		0x30		/* Read and Write */
-#define M_GEN_CALL		(1 << 11)
-#define M_START_DET		(1 << 10)
-#define M_STOP_DET		(1 << 9)
-#define M_ACTIVITY		(1 << 8)
-#define M_RX_DONE		(1 << 7)
-#define	M_TX_ABRT		(1 << 6)
-#define M_RD_REQ		(1 << 5)
-#define M_TX_EMPTY		(1 << 4)
-#define M_TX_OVER		(1 << 3)
-#define	M_RX_FULL		(1 << 2)
-#define	M_RX_OVER		(1 << 1)
-#define M_RX_UNDER		(1 << 0)
-
-/* Raw Interrupt Status Register */
-#define IC_RAW_INTR_STAT	0x34		/* Read Only */
-#define GEN_CALL		(1 << 11)	/* General call */
-#define START_DET		(1 << 10)	/* (RE)START occurred */
-#define STOP_DET		(1 << 9)	/* STOP occurred */
-#define ACTIVITY		(1 << 8)	/* Bus busy */
-#define RX_DONE			(1 << 7)	/* Not used in Master mode */
-#define	TX_ABRT			(1 << 6)	/* Transmit Abort */
-#define RD_REQ			(1 << 5)	/* Not used in Master mode */
-#define TX_EMPTY		(1 << 4)	/* TX FIFO <= threshold */
-#define TX_OVER			(1 << 3)	/* TX FIFO overflow */
-#define	RX_FULL			(1 << 2)	/* RX FIFO >= threshold */
-#define	RX_OVER			(1 << 1)	/* RX FIFO overflow */
-#define RX_UNDER		(1 << 0)	/* RX FIFO empty */
-
-/* Receive FIFO Threshold Register */
-#define IC_RX_TL		0x38
-
-/* Transmit FIFO Treshold Register */
-#define IC_TX_TL		0x3c
-
-/* Clear Combined and Individual Interrupt Register */
-#define IC_CLR_INTR		0x40
-#define CLR_INTR		(1 << 0)
-
-/* Clear RX_UNDER Interrupt Register */
-#define IC_CLR_RX_UNDER		0x44
-#define CLR_RX_UNDER		(1 << 0)
-
-/* Clear RX_OVER Interrupt Register */
-#define IC_CLR_RX_OVER		0x48
-#define CLR_RX_OVER		(1 << 0)
-
-/* Clear TX_OVER Interrupt Register */
-#define IC_CLR_TX_OVER		0x4c
-#define CLR_TX_OVER		(1 << 0)
-
-#define IC_CLR_RD_REQ		0x50
-
-/* Clear TX_ABRT Interrupt Register */
-#define IC_CLR_TX_ABRT		0x54
-#define CLR_TX_ABRT		(1 << 0)
-#define IC_CLR_RX_DONE		0x58
-
-/* Clear ACTIVITY Interrupt Register */
-#define IC_CLR_ACTIVITY		0x5c
-#define CLR_ACTIVITY		(1 << 0)
-
-/* Clear STOP_DET Interrupt Register */
-#define IC_CLR_STOP_DET		0x60
-#define CLR_STOP_DET		(1 << 0)
-
-/* Clear START_DET Interrupt Register */
-#define IC_CLR_START_DET	0x64
-#define CLR_START_DET		(1 << 0)
-
-/* Clear GEN_CALL Interrupt Register */
-#define IC_CLR_GEN_CALL		0x68
-#define CLR_GEN_CALL		(1 << 0)
-
-/* Enable Register */
-#define IC_ENABLE		0x6c
-#define ENABLE			(1 << 0)
-
-/* Status Register */
-#define IC_STATUS		0x70		/* Read Only */
-#define STAT_SLV_ACTIVITY	(1 << 6)	/* Slave not in idle */
-#define STAT_MST_ACTIVITY	(1 << 5)	/* Master not in idle */
-#define STAT_RFF		(1 << 4)	/* RX FIFO Full */
-#define STAT_RFNE		(1 << 3)	/* RX FIFO Not Empty */
-#define STAT_TFE		(1 << 2)	/* TX FIFO Empty */
-#define STAT_TFNF		(1 << 1)	/* TX FIFO Not Full */
-#define STAT_ACTIVITY		(1 << 0)	/* Activity Status */
-
-/* Transmit FIFO Level Register */
-#define IC_TXFLR		0x74		/* Read Only */
-#define TXFLR			(1 << 0)	/* TX FIFO level */
-
-/* Receive FIFO Level Register */
-#define IC_RXFLR		0x78		/* Read Only */
-#define RXFLR			(1 << 0)	/* RX FIFO level */
-
-/* Transmit Abort Source Register */
-#define IC_TX_ABRT_SOURCE	0x80
-#define ABRT_SLVRD_INTX		(1 << 15)
-#define ABRT_SLV_ARBLOST	(1 << 14)
-#define ABRT_SLVFLUSH_TXFIFO	(1 << 13)
-#define	ARB_LOST		(1 << 12)
-#define ABRT_MASTER_DIS		(1 << 11)
-#define ABRT_10B_RD_NORSTRT	(1 << 10)
-#define ABRT_SBYTE_NORSTRT	(1 << 9)
-#define ABRT_HS_NORSTRT		(1 << 8)
-#define ABRT_SBYTE_ACKDET	(1 << 7)
-#define ABRT_HS_ACKDET		(1 << 6)
-#define ABRT_GCALL_READ		(1 << 5)
-#define ABRT_GCALL_NOACK	(1 << 4)
-#define ABRT_TXDATA_NOACK	(1 << 3)
-#define ABRT_10ADDR2_NOACK	(1 << 2)
-#define ABRT_10ADDR1_NOACK	(1 << 1)
-#define ABRT_7B_ADDR_NOACK	(1 << 0)
-
-/* Enable Status Register */
-#define IC_ENABLE_STATUS	0x9c
-#define IC_EN			(1 << 0)	/* I2C in an enabled state */
-
-/* Component Parameter Register 1*/
-#define IC_COMP_PARAM_1		0xf4
-#define APB_DATA_WIDTH		(0x3 << 0)
-
-/* added by xiaolin --begin */
-#define SS_MIN_SCL_HIGH         4000
-#define SS_MIN_SCL_LOW          4700
-#define FS_MIN_SCL_HIGH         600
-#define FS_MIN_SCL_LOW          1300
-#define HS_MIN_SCL_HIGH_100PF   60
-#define HS_MIN_SCL_LOW_100PF    120
-
-#define STANDARD		0
-#define FAST			1
-#define HIGH			2
-
-#define NUM_SPEEDS		3
-
-static int speed_mode[6] = {
-	FAST,
-	FAST,
-	FAST,
-	STANDARD,
-	FAST,
-	FAST
-};
-
-static int ctl_num = 6;
-module_param_array(speed_mode, int, &ctl_num, S_IRUGO);
-MODULE_PARM_DESC(speed_mode, "Set the speed of the i2c interface (0-2)");
-
-/**
- * intel_mid_i2c_disable - Disable I2C controller
- * @adap: struct pointer to i2c_adapter
- *
- * Return Value:
- * 0		success
- * -EBUSY	if device is busy
- * -ETIMEDOUT	if i2c cannot be disabled within the given time
- *
- * I2C bus state should be checked prior to disabling the hardware. If bus is
- * not in idle state, an errno is returned. Write "0" to IC_ENABLE to disable
- * I2C controller.
- */
-static int intel_mid_i2c_disable(struct i2c_adapter *adap)
-{
-	struct intel_mid_i2c_private *i2c = i2c_get_adapdata(adap);
-	int err = 0;
-	int count = 0;
-	int ret1, ret2;
-	static const u16 delay[NUM_SPEEDS] = {100, 25, 3};
-
-	/* Set IC_ENABLE to 0 */
-	writel(0, i2c->base + IC_ENABLE);
-
-	/* Check if device is busy */
-	dev_dbg(&adap->dev, "mrst i2c disable\n");
-	while ((ret1 = readl(i2c->base + IC_ENABLE_STATUS) & 0x1)
-		|| (ret2 = readl(i2c->base + IC_STATUS) & 0x1)) {
-		udelay(delay[i2c->speed]);
-		writel(0, i2c->base + IC_ENABLE);
-		dev_dbg(&adap->dev, "i2c is busy, count is %d speed %d\n",
-			count, i2c->speed);
-		if (count++ > 10) {
-			err = -ETIMEDOUT;
-			break;
-		}
-	}
-
-	/* Clear all interrupts */
-	readl(i2c->base + IC_CLR_INTR);
-	readl(i2c->base + IC_CLR_STOP_DET);
-	readl(i2c->base + IC_CLR_START_DET);
-	readl(i2c->base + IC_CLR_ACTIVITY);
-	readl(i2c->base + IC_CLR_TX_ABRT);
-	readl(i2c->base + IC_CLR_RX_OVER);
-	readl(i2c->base + IC_CLR_RX_UNDER);
-	readl(i2c->base + IC_CLR_TX_OVER);
-	readl(i2c->base + IC_CLR_RX_DONE);
-	readl(i2c->base + IC_CLR_GEN_CALL);
-
-	/* Disable all interupts */
-	writel(0x0000, i2c->base + IC_INTR_MASK);
-
-	return err;
-}
-
-/**
- * intel_mid_i2c_hwinit - Initialize the I2C hardware registers
- * @dev: pci device struct pointer
- *
- * This function will be called in intel_mid_i2c_probe() before device
- * registration.
- *
- * Return Values:
- * 0		success
- * -EBUSY	i2c cannot be disabled
- * -ETIMEDOUT	i2c cannot be disabled
- * -EFAULT	If APB data width is not 32-bit wide
- *
- * I2C should be disabled prior to other register operation. If failed, an
- * errno is returned. Mask and Clear all interrpts, this should be done at
- * first.  Set common registers which will not be modified during normal
- * transfers, including: control register, FIFO threshold and clock freq.
- * Check APB data width at last.
- */
-static int intel_mid_i2c_hwinit(struct intel_mid_i2c_private *i2c)
-{
-	int err;
-
-	static const u16 hcnt[NUM_PLATFORMS][NUM_SPEEDS] = {
-		{ 0x75,  0x15, 0x07 },
-		{ 0x04c,  0x10, 0x06 }
-	};
-	static const u16 lcnt[NUM_PLATFORMS][NUM_SPEEDS] = {
-		{ 0x7C,  0x21, 0x0E },
-		{ 0x053, 0x19, 0x0F }
-	};
-
-	/* Disable i2c first */
-	err = intel_mid_i2c_disable(&i2c->adap);
-	if (err)
-		return err;
-
-	/*
-	 * Setup clock frequency and speed mode
-	 * Enable restart condition,
-	 * enable master FSM, disable slave FSM,
-	 * use target address when initiating transfer
-	 */
-
-	writel((i2c->speed + 1) << 1 | SLV_DIS | RESTART | MASTER_EN,
-		i2c->base + IC_CON);
-	writel(hcnt[i2c->platform][i2c->speed],
-		i2c->base + (IC_SS_SCL_HCNT + (i2c->speed << 3)));
-	writel(lcnt[i2c->platform][i2c->speed],
-		i2c->base + (IC_SS_SCL_LCNT + (i2c->speed << 3)));
-
-	/* Set tranmit & receive FIFO threshold to zero */
-	writel(0x0, i2c->base + IC_RX_TL);
-	writel(0x0, i2c->base + IC_TX_TL);
-
-	return 0;
-}
-
-/**
- * intel_mid_i2c_func - Return the supported three I2C operations.
- * @adapter: i2c_adapter struct pointer
- */
-static u32 intel_mid_i2c_func(struct i2c_adapter *adapter)
-{
-	return I2C_FUNC_I2C | I2C_FUNC_10BIT_ADDR | I2C_FUNC_SMBUS_EMUL;
-}
-
-/**
- * intel_mid_i2c_address_neq - To check if the addresses for different i2c messages
- * are equal.
- * @p1: first i2c_msg
- * @p2: second i2c_msg
- *
- * Return Values:
- * 0	 if addresses are equal
- * 1	 if not equal
- *
- * Within a single transfer, the I2C client may need to send its address more
- * than once. So a check if the addresses match is needed.
- */
-static inline bool intel_mid_i2c_address_neq(const struct i2c_msg *p1,
-				       const struct i2c_msg *p2)
-{
-	if (p1->addr != p2->addr)
-		return 1;
-	if ((p1->flags ^ p2->flags) & I2C_M_TEN)
-		return 1;
-	return 0;
-}
-
-/**
- * intel_mid_i2c_abort - To handle transfer abortions and print error messages.
- * @adap: i2c_adapter struct pointer
- *
- * By reading register IC_TX_ABRT_SOURCE, various transfer errors can be
- * distingushed. At present, no circumstances have been found out that
- * multiple errors would be occurred simutaneously, so we simply use the
- * register value directly.
- *
- * At last the error bits are cleared. (Note clear ABRT_SBYTE_NORSTRT bit need
- * a few extra steps)
- */
-static void intel_mid_i2c_abort(struct intel_mid_i2c_private *i2c)
-{
-	/* Read about source register */
-	int abort = i2c->abort;
-	struct i2c_adapter *adap = &i2c->adap;
-
-	/* Single transfer error check:
-	 * According to databook, TX/RX FIFOs would be flushed when
-	 * the abort interrupt occurred.
-	 */
-	if (abort & ABRT_MASTER_DIS)
-		dev_err(&adap->dev,
-		"initiate master operation with master mode disabled.\n");
-	if (abort & ABRT_10B_RD_NORSTRT)
-		dev_err(&adap->dev,
-	"RESTART disabled and master sent READ cmd in 10-bit addressing.\n");
-
-	if (abort & ABRT_SBYTE_NORSTRT) {
-		dev_err(&adap->dev,
-		"RESTART disabled and user is trying to send START byte.\n");
-		writel(~ABRT_SBYTE_NORSTRT, i2c->base + IC_TX_ABRT_SOURCE);
-		writel(RESTART, i2c->base + IC_CON);
-		writel(~IC_TAR_SPECIAL, i2c->base + IC_TAR);
-	}
-
-	if (abort & ABRT_SBYTE_ACKDET)
-		dev_err(&adap->dev,
-			"START byte was not acknowledged.\n");
-	if (abort & ABRT_TXDATA_NOACK)
-		dev_dbg(&adap->dev,
-			"No acknowledgement received from slave.\n");
-	if (abort & ABRT_10ADDR2_NOACK)
-		dev_dbg(&adap->dev,
-	"The 2nd address byte of the 10-bit address was not acknowledged.\n");
-	if (abort & ABRT_10ADDR1_NOACK)
-		dev_dbg(&adap->dev,
-	"The 1st address byte of 10-bit address was not acknowledged.\n");
-	if (abort & ABRT_7B_ADDR_NOACK)
-		dev_dbg(&adap->dev,
-			"I2C slave device not acknowledged.\n");
-
-	/* Clear TX_ABRT bit */
-	readl(i2c->base + IC_CLR_TX_ABRT);
-	i2c->status = STATUS_XFER_ABORT;
-}
-
-/**
- * xfer_read - Internal function to implement master read transfer.
- * @adap: i2c_adapter struct pointer
- * @buf: buffer in i2c_msg
- * @length: number of bytes to be read
- *
- * Return Values:
- * 0		if the read transfer succeeds
- * -ETIMEDOUT	if cannot read the "raw" interrupt register
- * -EINVAL	if a transfer abort occurred
- *
- * For every byte, a "READ" command will be loaded into IC_DATA_CMD prior to
- * data transfer. The actual "read" operation will be performed if an RX_FULL
- * interrupt occurred.
- *
- * Note there may be two interrupt signals captured, one should read
- * IC_RAW_INTR_STAT to separate between errors and actual data.
- */
-static int xfer_read(struct i2c_adapter *adap, unsigned char *buf, int length)
-{
-	struct intel_mid_i2c_private *i2c = i2c_get_adapdata(adap);
-	int i = length;
-	int err;
-
-	if (length >= 256) {
-		dev_err(&adap->dev,
-			"I2C FIFO cannot support larger than 256 bytes\n");
-		return -EMSGSIZE;
-	}
-
-	INIT_COMPLETION(i2c->complete);
-
-	readl(i2c->base + IC_CLR_INTR);
-	writel(0x0044, i2c->base + IC_INTR_MASK);
-
-	i2c->status = STATUS_READ_START;
-
-	while (i--)
-		writel(IC_RD, i2c->base + IC_DATA_CMD);
-
-	i2c->status = STATUS_READ_START;
-	err = wait_for_completion_interruptible_timeout(&i2c->complete, HZ);
-	if (!err) {
-		dev_err(&adap->dev, "Timeout for ACK from I2C slave device\n");
-		intel_mid_i2c_hwinit(i2c);
-		return -ETIMEDOUT;
-	}
-	if (i2c->status == STATUS_READ_SUCCESS)
-		return 0;
-	else
-		return -EIO;
-}
-
-/**
- * xfer_write - Internal function to implement master write transfer.
- * @adap: i2c_adapter struct pointer
- * @buf: buffer in i2c_msg
- * @length: number of bytes to be read
- *
- * Return Values:
- * 0	if the read transfer succeeds
- * -ETIMEDOUT	if we cannot read the "raw" interrupt register
- * -EINVAL	if a transfer abort occurred
- *
- * For every byte, a "WRITE" command will be loaded into IC_DATA_CMD prior to
- * data transfer. The actual "write" operation will be performed when the
- * RX_FULL interrupt signal occurs.
- *
- * Note there may be two interrupt signals captured, one should read
- * IC_RAW_INTR_STAT to separate between errors and actual data.
- */
-static int xfer_write(struct i2c_adapter *adap,
-		      unsigned char *buf, int length)
-{
-	struct intel_mid_i2c_private *i2c = i2c_get_adapdata(adap);
-	int i, err;
-
-	if (length >= 256) {
-		dev_err(&adap->dev,
-			"I2C FIFO cannot support larger than 256 bytes\n");
-		return -EMSGSIZE;
-	}
-
-	INIT_COMPLETION(i2c->complete);
-
-	readl(i2c->base + IC_CLR_INTR);
-	writel(0x0050, i2c->base + IC_INTR_MASK);
-
-	i2c->status = STATUS_WRITE_START;
-	for (i = 0; i < length; i++)
-		writel((u16)(*(buf + i)), i2c->base + IC_DATA_CMD);
-
-	i2c->status = STATUS_WRITE_START;
-	err = wait_for_completion_interruptible_timeout(&i2c->complete, HZ);
-	if (!err) {
-		dev_err(&adap->dev, "Timeout for ACK from I2C slave device\n");
-		intel_mid_i2c_hwinit(i2c);
-		return -ETIMEDOUT;
-	} else {
-		if (i2c->status == STATUS_WRITE_SUCCESS)
-			return 0;
-		else
-			return -EIO;
-	}
-}
-
-static int intel_mid_i2c_setup(struct i2c_adapter *adap,  struct i2c_msg *pmsg)
-{
-	struct intel_mid_i2c_private *i2c = i2c_get_adapdata(adap);
-	int err;
-	u32 reg;
-	u32 bit_mask;
-	u32 mode;
-
-	/* Disable device first */
-	err = intel_mid_i2c_disable(adap);
-	if (err) {
-		dev_err(&adap->dev,
-			"Cannot disable i2c controller, timeout\n");
-		return err;
-	}
-
-	mode = (1 + i2c->speed) << 1;
-	/* set the speed mode */
-	reg = readl(i2c->base + IC_CON);
-	if ((reg & 0x06) != mode) {
-		dev_dbg(&adap->dev, "set mode %d\n", i2c->speed);
-		writel((reg & ~0x6) | mode, i2c->base + IC_CON);
-	}
-
-	reg = readl(i2c->base + IC_CON);
-	/* use 7-bit addressing */
-	if (pmsg->flags & I2C_M_TEN) {
-		if ((reg & ADDR_10BIT) != ADDR_10BIT) {
-			dev_dbg(&adap->dev, "set i2c 10 bit address mode\n");
-			writel(reg | ADDR_10BIT, i2c->base + IC_CON);
-		}
-	} else {
-		if ((reg & ADDR_10BIT) != 0x0) {
-			dev_dbg(&adap->dev, "set i2c 7 bit address mode\n");
-			writel(reg & ~ADDR_10BIT, i2c->base + IC_CON);
-		}
-	}
-	/* enable restart conditions */
-	reg = readl(i2c->base + IC_CON);
-	if ((reg & RESTART) != RESTART) {
-		dev_dbg(&adap->dev, "enable restart conditions\n");
-		writel(reg | RESTART, i2c->base + IC_CON);
-	}
-
-	/* enable master FSM */
-	reg = readl(i2c->base + IC_CON);
-	dev_dbg(&adap->dev, "ic_con reg is 0x%x\n", reg);
-	writel(reg | MASTER_EN, i2c->base + IC_CON);
-	if ((reg & SLV_DIS) != SLV_DIS) {
-		dev_dbg(&adap->dev, "enable master FSM\n");
-		writel(reg | SLV_DIS, i2c->base + IC_CON);
-		dev_dbg(&adap->dev, "ic_con reg is 0x%x\n", reg);
-	}
-
-	/* use target address when initiating transfer */
-	reg = readl(i2c->base + IC_TAR);
-	bit_mask = IC_TAR_SPECIAL | IC_TAR_GC_OR_START;
-
-	if ((reg & bit_mask) != 0x0) {
-		dev_dbg(&adap->dev,
-	 "WR: use target address when intiating transfer, i2c_tx_target\n");
-		writel(reg & ~bit_mask, i2c->base + IC_TAR);
-	}
-
-	/* set target address to the I2C slave address */
-	dev_dbg(&adap->dev,
-		"set target address to the I2C slave address, addr is %x\n",
-			pmsg->addr);
-	writel(pmsg->addr | (pmsg->flags & I2C_M_TEN ? IC_TAR_10BIT_ADDR : 0),
-		i2c->base + IC_TAR);
-
-	/* Enable I2C controller */
-	writel(ENABLE, i2c->base + IC_ENABLE);
-
-	return 0;
-}
-
-/**
- * intel_mid_i2c_xfer - Main master transfer routine.
- * @adap: i2c_adapter struct pointer
- * @pmsg: i2c_msg struct pointer
- * @num: number of i2c_msg
- *
- * Return Values:
- * +		number of messages transferred
- * -ETIMEDOUT	If cannot disable I2C controller or read IC_STATUS
- * -EINVAL	If the address in i2c_msg is invalid
- *
- * This function will be registered in i2c-core and exposed to external
- * I2C clients.
- * 1. Disable I2C controller
- * 2. Unmask three interrupts: RX_FULL, TX_EMPTY, TX_ABRT
- * 3. Check if address in i2c_msg is valid
- * 4. Enable I2C controller
- * 5. Perform real transfer (call xfer_read or xfer_write)
- * 6. Wait until the current transfer is finished (check bus state)
- * 7. Mask and clear all interrupts
- */
-static int intel_mid_i2c_xfer(struct i2c_adapter *adap,
-			 struct i2c_msg *pmsg,
-			 int num)
-{
-	struct intel_mid_i2c_private *i2c = i2c_get_adapdata(adap);
-	int i, err = 0;
-
-	/* if number of messages equal 0*/
-	if (num == 0)
-		return 0;
-
-	pm_runtime_get(i2c->dev);
-
-	mutex_lock(&i2c->lock);
-	dev_dbg(&adap->dev, "intel_mid_i2c_xfer, process %d msg(s)\n", num);
-	dev_dbg(&adap->dev, "slave address is %x\n", pmsg->addr);
-
-
-	if (i2c->status != STATUS_IDLE) {
-		dev_err(&adap->dev, "Adapter %d in transfer/standby\n",
-								adap->nr);
-		mutex_unlock(&i2c->lock);
-		pm_runtime_put(i2c->dev);
-		return -1;
-	}
-
-
-	for (i = 1; i < num; i++) {
-		/* Message address equal? */
-		if (unlikely(intel_mid_i2c_address_neq(&pmsg[0], &pmsg[i]))) {
-			dev_err(&adap->dev, "Invalid address in msg[%d]\n", i);
-			mutex_unlock(&i2c->lock);
-			pm_runtime_put(i2c->dev);
-			return -EINVAL;
-		}
-	}
-
-	if (intel_mid_i2c_setup(adap, pmsg)) {
-		mutex_unlock(&i2c->lock);
-		pm_runtime_put(i2c->dev);
-		return -EINVAL;
-	}
-
-	for (i = 0; i < num; i++) {
-		i2c->msg = pmsg;
-		i2c->status = STATUS_IDLE;
-		/* Read or Write */
-		if (pmsg->flags & I2C_M_RD) {
-			dev_dbg(&adap->dev, "I2C_M_RD\n");
-			err = xfer_read(adap, pmsg->buf, pmsg->len);
-		} else {
-			dev_dbg(&adap->dev, "I2C_M_WR\n");
-			err = xfer_write(adap, pmsg->buf, pmsg->len);
-		}
-		if (err < 0)
-			break;
-		dev_dbg(&adap->dev, "msg[%d] transfer complete\n", i);
-		pmsg++;		/* next message */
-	}
-
-	/* Mask interrupts */
-	writel(0x0000, i2c->base + IC_INTR_MASK);
-	/* Clear all interrupts */
-	readl(i2c->base + IC_CLR_INTR);
-
-	i2c->status = STATUS_IDLE;
-	mutex_unlock(&i2c->lock);
-	pm_runtime_put(i2c->dev);
-
-	return err;
-}
-
-static int intel_mid_i2c_runtime_suspend(struct device *dev)
-{
-	struct pci_dev *pdev = to_pci_dev(dev);
-	struct intel_mid_i2c_private *i2c = pci_get_drvdata(pdev);
-	struct i2c_adapter *adap = to_i2c_adapter(dev);
-	int err;
-
-	if (i2c->status != STATUS_IDLE)
-		return -1;
-
-	intel_mid_i2c_disable(adap);
-
-	err = pci_save_state(pdev);
-	if (err) {
-		dev_err(dev, "pci_save_state failed\n");
-		return err;
-	}
-
-	err = pci_set_power_state(pdev, PCI_D3hot);
-	if (err) {
-		dev_err(dev, "pci_set_power_state failed\n");
-		return err;
-	}
-	i2c->status = STATUS_STANDBY;
-
-	return 0;
-}
-
-static int intel_mid_i2c_runtime_resume(struct device *dev)
-{
-	struct pci_dev *pdev = to_pci_dev(dev);
-	struct intel_mid_i2c_private *i2c = pci_get_drvdata(pdev);
-	int err;
-
-	if (i2c->status != STATUS_STANDBY)
-		return 0;
-
-	pci_set_power_state(pdev, PCI_D0);
-	pci_restore_state(pdev);
-	err = pci_enable_device(pdev);
-	if (err) {
-		dev_err(dev, "pci_enable_device failed\n");
-		return err;
-	}
-
-	i2c->status = STATUS_IDLE;
-
-	intel_mid_i2c_hwinit(i2c);
-	return err;
-}
-
-static void i2c_isr_read(struct intel_mid_i2c_private *i2c)
-{
-	struct i2c_msg *msg = i2c->msg;
-	int rx_num;
-	u32 len;
-	u8 *buf;
-
-	if (!(msg->flags & I2C_M_RD))
-		return;
-
-	if (i2c->status != STATUS_READ_IN_PROGRESS) {
-		len = msg->len;
-		buf = msg->buf;
-	} else {
-		len = i2c->rx_buf_len;
-		buf = i2c->rx_buf;
-	}
-
-	rx_num = readl(i2c->base + IC_RXFLR);
-
-	for (; len > 0 && rx_num > 0; len--, rx_num--)
-		*buf++ = readl(i2c->base + IC_DATA_CMD);
-
-	if (len > 0) {
-		i2c->status = STATUS_READ_IN_PROGRESS;
-		i2c->rx_buf_len = len;
-		i2c->rx_buf = buf;
-	} else
-		i2c->status = STATUS_READ_SUCCESS;
-
-	return;
-}
-
-static irqreturn_t intel_mid_i2c_isr(int this_irq, void *dev)
-{
-	struct intel_mid_i2c_private *i2c = dev;
-	u32 stat = readl(i2c->base + IC_INTR_STAT);
-
-	if (!stat)
-		return IRQ_NONE;
-
-	dev_dbg(&i2c->adap.dev, "%s, stat = 0x%x\n", __func__, stat);
-	stat &= 0x54;
-
-	if (i2c->status != STATUS_WRITE_START &&
-	    i2c->status != STATUS_READ_START &&
-	    i2c->status != STATUS_READ_IN_PROGRESS)
-		goto err;
-
-	if (stat & TX_ABRT)
-		i2c->abort = readl(i2c->base + IC_TX_ABRT_SOURCE);
-
-	readl(i2c->base + IC_CLR_INTR);
-
-	if (stat & TX_ABRT) {
-		intel_mid_i2c_abort(i2c);
-		goto exit;
-	}
-
-	if (stat & RX_FULL) {
-		i2c_isr_read(i2c);
-		goto exit;
-	}
-
-	if (stat & TX_EMPTY) {
-		if (readl(i2c->base + IC_STATUS) & 0x4)
-			i2c->status = STATUS_WRITE_SUCCESS;
-	}
-
-exit:
-	if (i2c->status == STATUS_READ_SUCCESS ||
-	    i2c->status == STATUS_WRITE_SUCCESS ||
-	    i2c->status == STATUS_XFER_ABORT) {
-		/* Clear all interrupts */
-		readl(i2c->base + IC_CLR_INTR);
-		/* Mask interrupts */
-		writel(0, i2c->base + IC_INTR_MASK);
-		complete(&i2c->complete);
-	}
-err:
-	return IRQ_HANDLED;
-}
-
-static struct i2c_algorithm intel_mid_i2c_algorithm = {
-	.master_xfer	= intel_mid_i2c_xfer,
-	.functionality	= intel_mid_i2c_func,
-};
-
-
-static const struct dev_pm_ops intel_mid_i2c_pm_ops = {
-	.runtime_suspend = intel_mid_i2c_runtime_suspend,
-	.runtime_resume = intel_mid_i2c_runtime_resume,
-};
-
-/**
- * intel_mid_i2c_probe - I2C controller initialization routine
- * @dev: pci device
- * @id: device id
- *
- * Return Values:
- * 0		success
- * -ENODEV	If cannot allocate pci resource
- * -ENOMEM	If the register base remapping failed, or
- *		if kzalloc failed
- *
- * Initialization steps:
- * 1. Request for PCI resource
- * 2. Remap the start address of PCI resource to register base
- * 3. Request for device memory region
- * 4. Fill in the struct members of intel_mid_i2c_private
- * 5. Call intel_mid_i2c_hwinit() for hardware initialization
- * 6. Register I2C adapter in i2c-core
- */
-static int __devinit intel_mid_i2c_probe(struct pci_dev *dev,
-				    const struct pci_device_id *id)
-{
-	struct intel_mid_i2c_private *mrst;
-	unsigned long start, len;
-	int err, busnum;
-	void __iomem *base = NULL;
-
-	dev_dbg(&dev->dev, "Get into probe function for I2C\n");
-	err = pci_enable_device(dev);
-	if (err) {
-		dev_err(&dev->dev, "Failed to enable I2C PCI device (%d)\n",
-			err);
-		goto exit;
-	}
-
-	/* Determine the address of the I2C area */
-	start = pci_resource_start(dev, 0);
-	len = pci_resource_len(dev, 0);
-	if (!start || len == 0) {
-		dev_err(&dev->dev, "base address not set\n");
-		err = -ENODEV;
-		goto exit;
-	}
-	dev_dbg(&dev->dev, "%s i2c resource start 0x%lx, len=%ld\n",
-		PLATFORM, start, len);
-
-	err = pci_request_region(dev, 0, DRIVER_NAME);
-	if (err) {
-		dev_err(&dev->dev, "failed to request I2C region "
-			"0x%lx-0x%lx\n", start,
-			(unsigned long)pci_resource_end(dev, 0));
-		goto exit;
-	}
-
-	base = ioremap_nocache(start, len);
-	if (!base) {
-		dev_err(&dev->dev, "I/O memory remapping failed\n");
-		err = -ENOMEM;
-		goto fail0;
-	}
-
-	/* Allocate the per-device data structure, intel_mid_i2c_private */
-	mrst = kzalloc(sizeof(struct intel_mid_i2c_private), GFP_KERNEL);
-	if (mrst == NULL) {
-		dev_err(&dev->dev, "can't allocate interface\n");
-		err = -ENOMEM;
-		goto fail1;
-	}
-
-	/* Initialize struct members */
-	snprintf(mrst->adap.name, sizeof(mrst->adap.name),
-		"Intel MID I2C at %lx", start);
-	mrst->adap.owner = THIS_MODULE;
-	mrst->adap.algo = &intel_mid_i2c_algorithm;
-	mrst->adap.dev.parent = &dev->dev;
-	mrst->dev = &dev->dev;
-	mrst->base = base;
-	mrst->speed = STANDARD;
-	mrst->abort = 0;
-	mrst->rx_buf_len = 0;
-	mrst->status = STATUS_IDLE;
-
-	pci_set_drvdata(dev, mrst);
-	i2c_set_adapdata(&mrst->adap, mrst);
-
-	mrst->adap.nr = busnum = id->driver_data;
-	if (dev->device <= 0x0804)
-		mrst->platform = MOORESTOWN;
-	else
-		mrst->platform = MEDFIELD;
-
-	dev_dbg(&dev->dev, "I2C%d\n", busnum);
-
-	if (ctl_num > busnum) {
-		if (speed_mode[busnum] < 0 || speed_mode[busnum] >= NUM_SPEEDS)
-			dev_warn(&dev->dev, "invalid speed %d ignored.\n",
-							speed_mode[busnum]);
-		else
-			mrst->speed = speed_mode[busnum];
-	}
-
-	/* Initialize i2c controller */
-	err = intel_mid_i2c_hwinit(mrst);
-	if (err < 0) {
-		dev_err(&dev->dev, "I2C interface initialization failed\n");
-		goto fail2;
-	}
-
-	mutex_init(&mrst->lock);
-	init_completion(&mrst->complete);
-
-	/* Clear all interrupts */
-	readl(mrst->base + IC_CLR_INTR);
-	writel(0x0000, mrst->base + IC_INTR_MASK);
-
-	err = request_irq(dev->irq, intel_mid_i2c_isr, IRQF_SHARED,
-					mrst->adap.name, mrst);
-	if (err) {
-		dev_err(&dev->dev, "Failed to request IRQ for I2C controller: "
-			"%s", mrst->adap.name);
-		goto fail2;
-	}
-
-	/* Adapter registration */
-	err = i2c_add_numbered_adapter(&mrst->adap);
-	if (err) {
-		dev_err(&dev->dev, "Adapter %s registration failed\n",
-			mrst->adap.name);
-		goto fail3;
-	}
-
-	dev_dbg(&dev->dev, "%s I2C bus %d driver bind success.\n",
-		(mrst->platform == MOORESTOWN) ? "Moorestown" : "Medfield",
-		busnum);
-
-	pm_runtime_enable(&dev->dev);
-	return 0;
-
-fail3:
-	free_irq(dev->irq, mrst);
-fail2:
-	pci_set_drvdata(dev, NULL);
-	kfree(mrst);
-fail1:
-	iounmap(base);
-fail0:
-	pci_release_region(dev, 0);
-exit:
-	return err;
-}
-
-static void __devexit intel_mid_i2c_remove(struct pci_dev *dev)
-{
-	struct intel_mid_i2c_private *mrst = pci_get_drvdata(dev);
-	intel_mid_i2c_disable(&mrst->adap);
-	if (i2c_del_adapter(&mrst->adap))
-		dev_err(&dev->dev, "Failed to delete i2c adapter");
-
-	free_irq(dev->irq, mrst);
-	pci_set_drvdata(dev, NULL);
-	iounmap(mrst->base);
-	kfree(mrst);
-	pci_release_region(dev, 0);
-}
-
-static struct pci_device_id intel_mid_i2c_ids[] = {
-	/* Moorestown */
-	{ PCI_VDEVICE(INTEL, 0x0802), 0 },
-	{ PCI_VDEVICE(INTEL, 0x0803), 1 },
-	{ PCI_VDEVICE(INTEL, 0x0804), 2 },
-	/* Medfield */
-	{ PCI_VDEVICE(INTEL, 0x0817), 3,},
-	{ PCI_VDEVICE(INTEL, 0x0818), 4 },
-	{ PCI_VDEVICE(INTEL, 0x0819), 5 },
-	{ PCI_VDEVICE(INTEL, 0x082C), 0 },
-	{ PCI_VDEVICE(INTEL, 0x082D), 1 },
-	{ PCI_VDEVICE(INTEL, 0x082E), 2 },
-	{ 0,}
-};
-MODULE_DEVICE_TABLE(pci, intel_mid_i2c_ids);
-
-static struct pci_driver intel_mid_i2c_driver = {
-	.name		= DRIVER_NAME,
-	.id_table	= intel_mid_i2c_ids,
-	.probe		= intel_mid_i2c_probe,
-	.remove		= __devexit_p(intel_mid_i2c_remove),
-};
-
-static int __init intel_mid_i2c_init(void)
-{
-	return pci_register_driver(&intel_mid_i2c_driver);
-}
-
-static void __exit intel_mid_i2c_exit(void)
-{
-	pci_unregister_driver(&intel_mid_i2c_driver);
-}
-
-module_init(intel_mid_i2c_init);
-module_exit(intel_mid_i2c_exit);
-
-MODULE_AUTHOR("Ba Zheng <[email protected]>");
-MODULE_DESCRIPTION("I2C driver for Moorestown Platform");
-MODULE_LICENSE("GPL");
-MODULE_VERSION(VERSION);

Signature · 6 lines

1.7.7.1

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