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    Subject[PATCH 13/13] i2c-intel-mid.c: Remove i2c-intel-mid.c
    Date
    From: Dirk Brandewie <dirk.brandewie@gmail.com>

    The Moorsetown and Medfield platforms are now supported by
    i2c-designware-pcidrv.c.

    Signed-off-by: Dirk Brandewie <dirk.brandewie@gmail.com>
    ---
    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

    diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
    index a815606..c590da2 100644
    --- a/drivers/i2c/busses/Kconfig
    +++ b/drivers/i2c/busses/Kconfig
    @@ -406,16 +406,6 @@ 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
    diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
    index 42ff6fe..a6aaa85 100644
    --- a/drivers/i2c/busses/Makefile
    +++ b/drivers/i2c/busses/Makefile
    @@ -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
    diff --git a/drivers/i2c/busses/i2c-intel-mid.c b/drivers/i2c/busses/i2c-intel-mid.c
    deleted file mode 100644
    index c714927..0000000
    --- a/drivers/i2c/busses/i2c-intel-mid.c
    +++ /dev/null
    @@ -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 occured */
    -#define STOP_DET (1 << 9) /* STOP occured */
    -#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: controll 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 occured 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 occured.
    - */
    - 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 occured
    - *
    - * 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 transfered
    - * -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 <zheng.ba@intel.com>");
    -MODULE_DESCRIPTION("I2C driver for Moorestown Platform");
    -MODULE_LICENSE("GPL");
    -MODULE_VERSION(VERSION);
    --
    1.7.3.4
    --
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