Topcliff: Update PCH_SPI driver to 2.6.35
diff mbox

Message ID 4C61EBAC.4000009@dsn.okisemi.com
State Superseded
Headers show

Commit Message

Masayuki Ohtake Aug. 11, 2010, 12:15 a.m. UTC
None

Patch
diff mbox

diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index f55eb01..b6ae72a 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -53,6 +53,32 @@  if SPI_MASTER
 
 comment "SPI Master Controller Drivers"
 
+config PCH_SPI_PLATFORM_DEVICE
+	boolean
+	default y if PCH_SPI
+	help
+	  This driver is for PCH SPI of Topcliff which is an IOH for x86
+	  embedded processor.
+	  This registers SPI devices for a given board.
+
+config PCH_SPI_PLATFORM_DEVICE_COUNT
+	int "PCH SPI Bus count"
+	range 1 2
+	depends on PCH_SPI_PLATFORM_DEVICE
+	help
+	  This driver is for PCH SPI of Topcliff which is an IOH for x86
+	  embedded processor.
+	  The number of SPI buses/channels supported by the PCH SPI controller.
+	  PCH SPI of Topcliff supports only one channel.
+
+config PCH_SPI
+	tristate "PCH SPI Controller"
+	depends on PCI
+	help
+	  This driver is for PCH SPI of Topcliff which is an IOH for x86
+	  embedded processor.
+	  This driver can access PCH SPI bus device.
+
 config SPI_ATMEL
 	tristate "Atmel SPI Controller"
 	depends on (ARCH_AT91 || AVR32)
diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index f3d2810..aecc873 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -59,3 +59,7 @@  obj-$(CONFIG_SPI_TLE62X0)	+= tle62x0.o
 
 # SPI slave drivers (protocol for that link)
 # 	... add above this line ...
+obj-$(CONFIG_PCH_SPI_PLATFORM_DEVICE) += pch_spi_platform_devices.o
+obj-$(CONFIG_PCH_SPI) += pch_spi.o
+pch_spi-objs := pch_spi_main.o
+
diff --git a/drivers/spi/pch_spi.h b/drivers/spi/pch_spi.h
new file mode 100644
index 0000000..b40377a
--- /dev/null
+++ b/drivers/spi/pch_spi.h
@@ -0,0 +1,177 @@ 
+/*
+ * Copyright (C) 2010 OKI SEMICONDUCTOR Co., LTD.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * 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.
+ */
+
+#ifndef __PCH_H__
+#define __PCH_H__
+
+#include <linux/wait.h>
+#include <linux/device.h>
+#include <linux/pci.h>
+#include <linux/spi/spi.h>
+#include <linux/workqueue.h>
+
+
+/* Register offsets */
+#define PCH_SPCR		0x00	/* SPI control register */
+#define PCH_SPBRR		0x04	/* SPI baud rate register */
+#define PCH_SPSR		0x08	/* SPI status register */
+#define PCH_SPDWR		0x0C	/* SPI write data register */
+#define PCH_SPDRR		0x10	/* SPI read data register */
+#define PCH_SSNXCR		0x18	/* SSN Expand Control Register */
+#define PCH_SRST		0x1C	/* SPI reset register */
+
+#define PCH_8_BPW		8
+#define PCH_16_BPW		16
+#define PCH_SPSR_TFD		0x000007C0
+#define PCH_SPSR_RFD		0x0000F800
+
+#define PCH_READABLE(x)		(((x) & PCH_SPSR_RFD)>>11)
+#define PCH_WRITABLE(x)		(((x) & PCH_SPSR_TFD)>>6)
+
+#define PCH_RX_THOLD		7
+#define PCH_RX_THOLD_MAX	15
+#define PCH_RX			1
+#define PCH_TX			2
+
+/* various interrupts */
+#define PCH_TFI			0x1
+#define PCH_RFI			0x2
+#define PCH_FI			0x4
+#define PCH_ORI			0x8
+#define PCH_MDFI		0x10
+
+#define PCH_ALL			(PCH_TFI|PCH_RFI|PCH_FI|PCH_ORI|PCH_MDFI)
+#define PCH_MAX_BAUDRATE	5000000
+#define PCH_MAX_FIFO_DEPTH	16
+
+#define STATUS_RUNNING		1
+#define STATUS_EXITING		2
+#define DRIVER_NAME		"pch_spi"
+#define PCH_SLEEP_TIME		10
+
+#define PCH_MAX_DEV		1
+
+#define PCH_ADDRESS_SIZE	0x20
+
+#define SSN_LOW			0x02U
+#define SSN_NO_CONTROL		0x00U
+#define PCH_MAX_CS		0xFF
+#define PCI_DEVICE_ID_GE_SPI	0x8816
+
+#define SPCR_SPE_BIT		(1 << 0)
+#define SPCR_MSTR_BIT		(1 << 1)
+#define SPCR_LSBF_BIT		(1 << 4)
+#define SPCR_CPHA_BIT		(1 << 5)
+#define SPCR_CPOL_BIT		(1 << 6)
+#define SPCR_TFIE_BIT		(1 << 8)
+#define SPCR_RFIE_BIT		(1 << 9)
+#define SPCR_FIE_BIT		(1 << 10)
+#define SPCR_ORIE_BIT		(1 << 11)
+#define SPCR_MDFIE_BIT		(1 << 12)
+#define SPCR_FICLR_BIT		(1 << 24)
+#define SPSR_TFI_BIT		(1 << 0)
+#define SPSR_RFI_BIT		(1 << 1)
+#define SPSR_FI_BIT		(1 << 2)
+#define SPBRR_SIZE_BIT		(1 << 10)
+
+#define SPCR_RFIC_FIELD		20
+#define SPCR_TFIC_FIELD		16
+
+#define SPSR_INT_BITS		0x1F
+#define MASK_SPBRR_SPBR_BITS	(~((1 << 10) - 1))
+#define MASK_RFIC_SPCR_BITS	(~(0xf << 20))
+#define MASK_TFIC_SPCR_BITS	(~(0xf000f << 12))
+
+#define PCH_CLOCK_HZ		50000000
+#define PCH_MAX_SPBR		1023
+
+#define PCH_SET_BITMSK(var, bitmask)	((var) |= (bitmask))
+#define PCH_CLR_BITMSK(var, bitmask)	((var) &= (~(bitmask)))
+
+/**
+ * struct pch_spi_data - Holds the SPI channel specific details
+ * @io_remap_addr:		The remapped PCI base address
+ * @p_master:			Pointer to the SPI master structure
+ * @work:			Reference to work queue handler
+ * @p_wk_q:			Workqueue for carrying out execution of the
+ *				requests
+ * @wait:			Wait queue for waking up upon receiving an
+ *				interrupt.
+ * @b_transfer_complete:		Status of SPI Transfer
+ * @bcurrent_msg_processing:	Status flag for message processing
+ * @lock:			Lock for protecting this structure
+ * @queue:			SPI Message queue
+ * @status:			Status of the SPI driver
+ * @bpw_len:			Length of data to be transferred in bits per
+ *				word
+ * @b_transfer_active:		Flag showing active transfer
+ * @tx_index:			Transmit data count; for bookkeeping during
+ *				transfer
+ * @rx_index:			Receive data count; for bookkeeping during
+ *				transfer
+ * @tx_buff:			Buffer for data to be transmitted
+ * @rx_index:			Buffer for Received data
+ * @n_curnt_chip:		The chip number that this SPI driver currently
+ *				operates on
+ * @p_current_chip:		Reference to the current chip that this SPI
+ *				driver currently operates on
+ * @p_current_msg:		The current message that this SPI driver is
+ *				handling
+ * @p_cur_trans:		The current transfer that this SPI driver is
+ *				handling
+ * @p_board_dat:		Reference to the SPI device data structure
+ */
+struct pch_spi_data {
+	void __iomem *io_remap_addr;
+	struct spi_master *p_master;
+	struct work_struct work;
+	struct workqueue_struct *p_wk_q;
+	wait_queue_head_t wait;
+	u8 b_transfer_complete;
+	u8 bcurrent_msg_processing;
+	spinlock_t lock;
+	struct list_head queue;
+	u8 status;
+	u32 bpw_len;
+	s8 b_transfer_active;
+	u32 tx_index;
+	u32 rx_index;
+	u16 *pkt_tx_buff;
+	u16 *pkt_rx_buff;
+	u8 n_curnt_chip;
+	struct spi_device *p_current_chip;
+	struct spi_message *p_current_msg;
+	struct spi_transfer *p_cur_trans;
+	struct pch_spi_board_data *p_board_dat;
+};
+
+/**
+ * struct pch_spi_board_data - Holds the SPI device specific details
+ * @pdev:		Pointer to the PCI device
+ * @irq_reg_sts:	Status of IRQ registration
+ * @pci_req_sts:	Status of pci_request_regions
+ * @suspend_sts:	Status of suspend
+ * @p_data:		Pointer to SPI channel data structure
+ */
+struct pch_spi_board_data {
+	struct pci_dev *pdev;
+	u8 irq_reg_sts;
+	u8 pci_req_sts;
+	u8 suspend_sts;
+	struct pch_spi_data *p_data[PCH_MAX_DEV];
+};
+#endif
diff --git a/drivers/spi/pch_spi_main.c b/drivers/spi/pch_spi_main.c
new file mode 100644
index 0000000..da87d92
--- /dev/null
+++ b/drivers/spi/pch_spi_main.c
@@ -0,0 +1,1823 @@ 
+/*
+ * Copyright (C) 2010 OKI SEMICONDUCTOR Co., LTD.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * 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/pci.h>
+#include <linux/wait.h>
+#include <linux/spi/spi.h>
+#include <linux/interrupt.h>
+#include <linux/sched.h>
+#include <linux/spi/spidev.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/mutex.h>
+#include "pch_spi.h"
+
+static struct pci_device_id pch_spi_pcidev_id[] = {
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_GE_SPI)},
+	{0,}
+};
+
+static void (*pch_spi_gcbptr) (struct pch_spi_data *);
+static DEFINE_MUTEX(pch_spi_mutex);
+
+/**
+ * pch_spi_writereg() - Performs  register writes
+ * @master:	Pointer to struct spi_master.
+ * @idx:	Register offset.
+ * @val:	Value to be written to register.
+ */
+static inline void pch_spi_writereg(struct spi_master *master, int idx, u32 val)
+{
+
+	struct pch_spi_data *p_data = spi_master_get_devdata(master);
+
+	iowrite32(val, (p_data->io_remap_addr + idx));
+
+	dev_dbg(&master->dev, "%s Offset=%x Value=%x\n", __func__, idx, val);
+}
+
+/**
+ * pch_spi_readreg() - Performs register reads
+ * @master:	Pointer to struct spi_master.
+ * @idx:	Register offset.
+ */
+static inline u32 pch_spi_readreg(struct spi_master *master, int idx)
+{
+	u32 reg_data;
+
+	struct pch_spi_data *p_data = spi_master_get_devdata(master);
+
+	dev_dbg(&master->dev, "%s Offset=%x\n", __func__, idx);
+	reg_data = ioread32((p_data->io_remap_addr + idx));
+
+	dev_dbg(&master->dev, "%s Content=%x\n", __func__, reg_data);
+	return reg_data;
+}
+
+static void pch_spi_set_master_mode(struct spi_master *master)
+{
+	u32 reg_spcr_val;
+	reg_spcr_val = pch_spi_readreg(master, PCH_SPCR);
+	dev_dbg(&master->dev, "%s SPCR content=%x\n", __func__, reg_spcr_val);
+
+	/*sets the second bit of SPCR to 1:master mode */
+	PCH_SET_BITMSK(reg_spcr_val, SPCR_MSTR_BIT);
+
+	/*write the value to SPCR register */
+	pch_spi_writereg(master, PCH_SPCR, reg_spcr_val);
+	dev_dbg(&master->dev, "%s SPCR after setting MSTR bit=%x\n",
+							__func__, reg_spcr_val);
+}
+
+/**
+ * ch_spi_disable_interrupts() - Disables specified interrupts
+ * @master:	Pointer to struct spi_master.
+ * @interrupt:	Interrups to be enabled.
+ */
+static void pch_spi_disable_interrupts(struct spi_master *master, u8 interrupt)
+{
+	u32 reg_val_spcr;
+
+	reg_val_spcr = pch_spi_readreg(master, PCH_SPCR);
+
+	dev_dbg(&master->dev, "%s SPCR content =%x\n",
+		   __func__, reg_val_spcr);
+
+	switch (interrupt & 0x1f) {
+	case PCH_RFI:
+		/*clear RFIE bit in SPCR */
+		dev_dbg(&master->dev,
+		  "%s clearing RFI in pch_spi_disable_interrupts\n", __func__);
+		PCH_CLR_BITMSK(reg_val_spcr, SPCR_RFIE_BIT);
+		break;
+
+	case PCH_TFI:
+		/*clear TFIE bit in SPCR */
+		dev_dbg(&master->dev,
+		  "%s clearing TFI in pch_spi_disable_interrupts\n", __func__);
+		PCH_CLR_BITMSK(reg_val_spcr, SPCR_TFIE_BIT);
+		break;
+
+	case PCH_FI:
+		/*clear FIE bit in SPCR */
+		dev_dbg(&master->dev,
+		  "%s clearing FI in pch_spi_disable_interrupts\n", __func__);
+		PCH_CLR_BITMSK(reg_val_spcr, SPCR_FIE_BIT);
+		break;
+
+	case PCH_ORI:
+		/*clear ORIE bit in SPCR */
+		dev_dbg(&master->dev,
+		  "%s clearing ORI in pch_spi_disable_interrupts\n", __func__);
+		PCH_CLR_BITMSK(reg_val_spcr, SPCR_ORIE_BIT);
+		break;
+
+	case PCH_MDFI:
+		/*clear MODFIE bit in SPCR */
+		dev_dbg(&master->dev,
+		  "%s clearing MDFI in pch_spi_disable_interrupts\n", __func__);
+		PCH_CLR_BITMSK(reg_val_spcr, SPCR_MDFIE_BIT);
+		break;
+
+	default:
+		dev_info(&master->dev,
+		 "%s Unknown interrupt(=0x%02x)\n", __func__, interrupt & 0x1f);
+	}
+
+	pch_spi_writereg(master, PCH_SPCR, reg_val_spcr);
+
+	dev_dbg(&master->dev, "%s SPCR after disabling interrupts =%x\n",
+							__func__, reg_val_spcr);
+}
+
+/**
+ * pch_spi_set_enable() - Sets/Resets the SPE bit in SPCR
+ * @spi:	Pointer to struct spi_device.
+ * @enable:	To enable/disable SPI transfer enable.
+ *		One can provide multiple line descriptions
+ *		for arguments.
+ */
+static void pch_spi_set_enable(const struct spi_device *spi, u8 enable)
+{
+	u32 reg_spcr_val;
+
+	reg_spcr_val = pch_spi_readreg(spi->master, PCH_SPCR);
+	dev_dbg(&spi->dev, "%s SPCR content=%x\n", __func__, reg_spcr_val);
+
+	if (enable == true) {
+		dev_dbg(&spi->dev, "%s enable==true\n", __func__);
+		PCH_SET_BITMSK(reg_spcr_val, SPCR_SPE_BIT);
+	} else {
+		dev_dbg(&spi->dev, "%s enable==false\n", __func__);
+		PCH_CLR_BITMSK(reg_spcr_val, SPCR_SPE_BIT);
+	}
+
+	pch_spi_writereg(spi->master, PCH_SPCR, reg_spcr_val);
+
+	dev_dbg(&spi->dev, "%s SPCR content after modifying SPE=%x\n",
+							__func__, reg_spcr_val);
+}
+
+/**
+ * pch_spi_handler() - Interrupt handler
+ * @irq:	The interrupt number.
+ * @dev_id:	Pointer to struct pch_spi_board_data.
+ */
+static irqreturn_t pch_spi_handler(int irq, void *dev_id)
+{
+	/*channel & read/write indices */
+	int dev, read_cnt;
+
+	/*SPSR content */
+	u32 reg_spsr_val, reg_spcr_val;
+
+	/*book keeping variables */
+	u32 n_read, tx_index, rx_index, bpw_len;
+
+	/*to hold channel data */
+	struct pch_spi_data *p_data;
+
+	/*buffer to store rx/tx data */
+	u16 *pkt_rx_buffer, *pkt_tx_buff;
+
+	/*register addresses */
+	void __iomem *spsr;
+	void __iomem *spdrr;
+	void __iomem *spdwr;
+
+	/*remapped pci base address */
+	void __iomem *io_remap_addr;
+
+	irqreturn_t tRetVal = IRQ_NONE;
+
+	struct pch_spi_board_data *p_board_dat =
+					(struct pch_spi_board_data *)dev_id;
+
+	if (p_board_dat->suspend_sts == true) {
+		dev_dbg(&p_board_dat->pdev->dev,
+				"%s returning due to suspend\n", __func__);
+	} else {
+		for (dev = 0; dev < PCH_MAX_DEV; dev++) {
+			p_data = p_board_dat->p_data[dev];
+			io_remap_addr = p_data->io_remap_addr;
+			spsr = io_remap_addr + PCH_SPSR;
+
+			reg_spsr_val = ioread32(spsr);
+
+			/*Check if the interrupt is for SPI device */
+
+			if (reg_spsr_val & (SPSR_FI_BIT | SPSR_RFI_BIT)) {
+				dev_dbg(&p_board_dat->pdev->dev,
+				  "SPSR in %s=%x\n", __func__, reg_spsr_val);
+				/*clear interrupt */
+				iowrite32(reg_spsr_val, spsr);
+
+				if (p_data->b_transfer_active == true) {
+					rx_index = p_data->rx_index;
+					tx_index = p_data->tx_index;
+					bpw_len = p_data->bpw_len;
+					pkt_rx_buffer = p_data->pkt_rx_buff;
+					pkt_tx_buff = p_data->pkt_tx_buff;
+
+					spdrr = io_remap_addr + PCH_SPDRR;
+					spdwr = io_remap_addr + PCH_SPDWR;
+
+					n_read = PCH_READABLE(reg_spsr_val);
+
+					for (read_cnt = 0; (read_cnt < n_read);
+					     read_cnt++) {
+						/*read data */
+						pkt_rx_buffer[rx_index++] =
+								ioread32(spdrr);
+						/*write data */
+
+						if (tx_index < bpw_len) {
+							iowrite32
+							    (pkt_tx_buff
+							     [tx_index++],
+							     spdwr);
+						}
+					}
+
+					/*disable RFI if not needed */
+					if ((bpw_len - rx_index) <=
+					    PCH_MAX_FIFO_DEPTH) {
+						dev_dbg(&p_board_dat->pdev->dev,
+						  "%s disabling RFI as data "
+						  "remaining=%d\n", __func__,
+						  (bpw_len - rx_index));
+
+						reg_spcr_val =
+						  ioread32(io_remap_addr +
+								PCH_SPCR);
+
+						/*disable RFI */
+						PCH_CLR_BITMSK(reg_spcr_val,
+								SPCR_RFIE_BIT);
+
+						/*reset rx threshold */
+						reg_spcr_val &=
+							 MASK_RFIC_SPCR_BITS;
+						reg_spcr_val |=
+							(PCH_RX_THOLD_MAX <<
+							SPCR_RFIC_FIELD);
+
+						iowrite32(PCH_CLR_BITMSK
+							(reg_spcr_val,
+								SPCR_RFIE_BIT),
+							(io_remap_addr +
+								PCH_SPCR));
+					}
+
+					/*update counts */
+					p_data->tx_index = tx_index;
+
+					p_data->rx_index = rx_index;
+
+					dev_dbg(&p_board_dat->pdev->dev,
+						"%s rx_index=%d tx_index=%d "
+						"nWritable=%d n_read=%d\n",
+						__func__, rx_index, tx_index,
+						(16 -
+						(PCH_WRITABLE(reg_spsr_val))),
+						n_read);
+
+				}
+
+				/*if transfer complete interrupt */
+				if (reg_spsr_val & SPSR_FI_BIT) {
+					dev_dbg(&p_board_dat->pdev->dev,
+							"%s FI bit in SPSR"
+							" set\n", __func__);
+
+					/*disable FI & RFI interrupts */
+					pch_spi_disable_interrupts(p_data->
+						p_master, PCH_FI | PCH_RFI);
+
+					/*transfer is completed;inform
+						 pch_spi_process_messages */
+
+					if (pch_spi_gcbptr != NULL) {
+						dev_dbg(&p_board_dat->pdev->dev,
+						  "%s invoking callback\n",
+						  __func__);
+						(*pch_spi_gcbptr) (p_data);
+					}
+				}
+
+				tRetVal = IRQ_HANDLED;
+			}
+		}
+	}
+
+	dev_dbg(&p_board_dat->pdev->dev, "%s EXIT return value=%d\n",
+							__func__, tRetVal);
+
+	return tRetVal;
+}
+
+/**
+ * pch_spi_entcb() - Registers the callback function
+ * @pch_spi_cb:	Callback function pointer.
+ */
+static void pch_spi_entcb(void (*pch_spi_cb) (struct pch_spi_data *))
+{
+	if (pch_spi_cb != NULL)
+		pch_spi_gcbptr = pch_spi_cb;
+}
+
+/**
+ * pch_spi_set_baud_rate() - Sets SPBR field in SPBRR
+ * @master:	Pointer to struct spi_master.
+ * @speed_hz:	Baud rate.
+ */
+static void pch_spi_set_baud_rate(struct spi_master *master, u32 speed_hz)
+{
+	u32 n_spbr, spbrr_val;
+
+	n_spbr = PCH_CLOCK_HZ / (speed_hz * 2);
+
+	/*if baud rate is less than we can support limit it */
+
+	if (n_spbr > PCH_MAX_SPBR)
+		n_spbr = PCH_MAX_SPBR;
+
+	spbrr_val = pch_spi_readreg(master, PCH_SPBRR);
+
+	dev_dbg(&master->dev, "%s SPBRR content=%x SPBR in SPBRR=%d\n",
+						__func__, spbrr_val, n_spbr);
+
+	/*clear SPBRR */
+	spbrr_val &= MASK_SPBRR_SPBR_BITS;
+
+	/*set the new value */
+	spbrr_val |= n_spbr;
+
+	/*write the new value */
+	pch_spi_writereg(master, PCH_SPBRR, spbrr_val);
+	dev_dbg(&master->dev, "%s SPBRR content after setting SPBR=%x\n",
+						__func__, spbrr_val);
+}
+
+/**
+ * pch_spi_set_bits_per_word() - Sets SIZE field in SPBRR
+ * @master:		Pointer to struct spi_master.
+ * @bits_per_word:	Bits per word for SPI transfer.
+ */
+static void pch_spi_set_bits_per_word(struct spi_master *master,
+				      u8 bits_per_word)
+{
+	u32 spbrr_val = pch_spi_readreg(master, PCH_SPBRR);
+	dev_dbg(&master->dev, "%s SPBRR content=%x\n", __func__, spbrr_val);
+
+	if (bits_per_word == PCH_8_BPW) {
+		PCH_CLR_BITMSK(spbrr_val, SPBRR_SIZE_BIT);
+		dev_dbg(&master->dev, "%s 8\n", __func__);
+	} else {
+		PCH_SET_BITMSK(spbrr_val, SPBRR_SIZE_BIT);
+		dev_dbg(&master->dev, "%s 16\n", __func__);
+	}
+
+	pch_spi_writereg(master, PCH_SPBRR, spbrr_val);
+
+	dev_dbg(&master->dev, "%s SPBRR after setting bits per word=%x\n",
+						__func__, spbrr_val);
+}
+
+/**
+ * pch_spi_clear_fifo() - Clears the Transmit and Receive FIFOs
+ * @master:	Pointer to struct spi_master.
+ */
+static void pch_spi_clear_fifo(struct spi_master *master)
+{
+	u32 reg_spcr_val = pch_spi_readreg(master, PCH_SPCR);
+
+	PCH_SET_BITMSK(reg_spcr_val, SPCR_FICLR_BIT);
+	pch_spi_writereg(master, PCH_SPCR, reg_spcr_val);
+	dev_dbg(&master->dev, "%s SPCR content after setting FICLR  = %x\n",
+							__func__, reg_spcr_val);
+
+	PCH_CLR_BITMSK(reg_spcr_val, SPCR_FICLR_BIT);
+	pch_spi_writereg(master, PCH_SPCR, reg_spcr_val);
+
+	dev_dbg(&master->dev, "%s SPCR content after resetting FICLR  = %x\n",
+						 __func__, reg_spcr_val);
+}
+
+/**
+ * pch_spi_setup_transfe() - Configures the PCH SPI hardware for transfer
+ * @spi:	Pointer to struct spi_device.
+ */
+static void pch_spi_setup_transfer(struct spi_device *spi)
+{
+	u32 reg_spcr_val;
+
+	dev_dbg(&spi->dev, "%s SPBRR content =%x setting baud rate=%d\n",
+	  __func__, pch_spi_readreg(spi->master, PCH_SPBRR), spi->max_speed_hz);
+
+	pch_spi_set_baud_rate(spi->master, spi->max_speed_hz);
+
+	/*set bits per word */
+	dev_dbg(&spi->dev, "%s :setting bits_per_word=%d\n",
+						__func__, spi->bits_per_word);
+	pch_spi_set_bits_per_word(spi->master, spi->bits_per_word);
+
+	dev_dbg(&spi->dev,
+		"%s SPBRR content after setting baud rate & bits per word=%x\n",
+		__func__, pch_spi_readreg(spi->master, PCH_SPBRR));
+
+	reg_spcr_val = pch_spi_readreg(spi->master, PCH_SPCR);
+	dev_dbg(&spi->dev, "%s SPCR content = %x\n", __func__, reg_spcr_val);
+
+	/*set bit justification */
+
+	if ((spi->mode & SPI_LSB_FIRST) != 0) {
+		/*LSB first */
+		PCH_CLR_BITMSK(reg_spcr_val, SPCR_LSBF_BIT);
+		dev_dbg(&spi->dev, "%s :setting LSBF bit to 0\n", __func__);
+	} else {
+		/*MSB first */
+		PCH_SET_BITMSK(reg_spcr_val, SPCR_LSBF_BIT);
+		dev_dbg(&spi->dev, "%s :setting LSBF bit to 1\n", __func__);
+	}
+
+	/*set clock polarity */
+	if ((spi->mode & SPI_CPOL) != 0) {
+		PCH_SET_BITMSK(reg_spcr_val, SPCR_CPOL_BIT);
+		dev_dbg(&spi->dev, "%s clock polarity = 1\n", __func__);
+	} else {
+		PCH_CLR_BITMSK(reg_spcr_val, SPCR_CPOL_BIT);
+		dev_dbg(&spi->dev, "%s clock polarity = 0\n", __func__);
+	}
+
+	/*set the clock phase */
+	if ((spi->mode & SPI_CPHA) != 0) {
+		PCH_SET_BITMSK(reg_spcr_val, SPCR_CPHA_BIT);
+		dev_dbg(&spi->dev, "%s clock phase = 1\n", __func__);
+	} else {
+		PCH_CLR_BITMSK(reg_spcr_val, SPCR_CPHA_BIT);
+		dev_dbg(&spi->dev, "%s clock phase = 0\n", __func__);
+	}
+
+	/*write SPCR SPCR register */
+	pch_spi_writereg(spi->master, PCH_SPCR, reg_spcr_val);
+
+	dev_dbg(&spi->dev,
+		"%s SPCR content after setting LSB/MSB and MODE= %x\n",
+		__func__, reg_spcr_val);
+
+	/*Clear the FIFO by toggling  FICLR to 1 and back to 0 */
+	pch_spi_clear_fifo(spi->master);
+}
+
+/**
+ * pch_spi_enable_interrupts() - Enables specified interrupts
+ * @master:	Pointer to struct spi_master.
+ * @interrupt:	Interrups to be enabled.
+ */
+static void pch_spi_enable_interrupts(struct spi_master *master, u8 interrupt)
+{
+	u32 reg_val_spcr;
+
+	reg_val_spcr = pch_spi_readreg(master, PCH_SPCR);
+
+	dev_dbg(&master->dev, "%s SPCR content=%x\n", __func__, reg_val_spcr);
+
+	if ((interrupt & PCH_RFI) != 0) {
+		/*set RFIE bit in SPCR */
+		dev_dbg(&master->dev, "setting RFI in %s\n", __func__);
+		PCH_SET_BITMSK(reg_val_spcr, SPCR_RFIE_BIT);
+	}
+
+	if ((interrupt & PCH_TFI) != 0) {
+		/*set TFIE bit in SPCR */
+		dev_dbg(&master->dev, "setting TFI in %s\n", __func__);
+		PCH_SET_BITMSK(reg_val_spcr, SPCR_TFIE_BIT);
+	}
+
+	if ((interrupt & PCH_FI) != 0) {
+		/*set FIE bit in SPCR */
+		dev_dbg(&master->dev, "setting FI in %s\n", __func__);
+		PCH_SET_BITMSK(reg_val_spcr, SPCR_FIE_BIT);
+	}
+
+	if ((interrupt & PCH_ORI) != 0) {
+		/*set ORIE bit in SPCR */
+		dev_dbg(&master->dev, "setting ORI in %s\n", __func__);
+		PCH_SET_BITMSK(reg_val_spcr, SPCR_ORIE_BIT);
+	}
+
+	if ((interrupt & PCH_MDFI) != 0) {
+		/*set MODFIE bit in SPCR */
+		dev_dbg(&master->dev, "setting MDFI in %s\n", __func__);
+		PCH_SET_BITMSK(reg_val_spcr, SPCR_MDFIE_BIT);
+	}
+
+	pch_spi_writereg(master, PCH_SPCR, reg_val_spcr);
+
+	dev_dbg(&master->dev, "%s SPCR content after enabling interrupt =%x\n",
+							__func__, reg_val_spcr);
+}
+
+/**
+ * pch_spi_set_threshold() - Sets Tx/Rx FIFO thresholds
+ * @spi:	Pointer to struct spi_device.
+ * @threshold:	Threshold value to be set.
+ * @dir:	Rx or Tx threshold to be set.
+ */
+static void pch_spi_set_threshold(struct spi_device *spi, u32 threshold, u8 dir)
+{
+	u32 reg_val_spcr;
+
+	reg_val_spcr = pch_spi_readreg(spi->master, PCH_SPCR);
+	dev_dbg(&spi->dev, "%s SPCR before modifying =%x threshold=%d\n",
+					__func__, reg_val_spcr, threshold + 1);
+
+	if (dir == PCH_RX) {
+		dev_dbg(&spi->dev, "%s setting Rx threshold\n", __func__);
+		reg_val_spcr &= MASK_RFIC_SPCR_BITS;
+		reg_val_spcr |= (threshold << SPCR_RFIC_FIELD);
+	} else if (dir == PCH_TX) {
+		dev_dbg(&spi->dev, "%s setting Tx threshold\n",  __func__);
+		reg_val_spcr &= MASK_TFIC_SPCR_BITS;
+		reg_val_spcr |= (threshold << SPCR_TFIC_FIELD);
+	}
+
+	pch_spi_writereg(spi->master, PCH_SPCR, reg_val_spcr);
+
+	dev_dbg(&spi->dev, "%s SPCR after modifying =%x\n", __func__,
+								reg_val_spcr);
+}
+
+/**
+ * pch_spi_reset() - Clears SPI registers
+ * @master:	Pointer to struct spi_master.
+ */
+static void pch_spi_reset(struct spi_master *master)
+{
+	/*write 1 to reset SPI */
+	pch_spi_writereg(master, PCH_SRST, 0x1);
+
+	/*clear reset */
+	pch_spi_writereg(master, PCH_SRST, 0x0);
+}
+
+static void pch_spi_callback(struct pch_spi_data *p_data)
+{
+	dev_dbg(&p_data->p_master->dev, "%s waking up process\n", __func__);
+	spin_lock(&p_data->lock);
+	p_data->b_transfer_complete = true;
+	wake_up(&p_data->wait);
+	dev_dbg(&p_data->p_master->dev, "%s invoked wake_up\n", __func__);
+	spin_unlock(&p_data->lock);
+}
+
+static int pch_spi_setup(struct spi_device *pspi)
+{
+	/*check bits per word */
+	if ((pspi->bits_per_word) == 0) {
+		pspi->bits_per_word = PCH_8_BPW;
+		dev_dbg(&pspi->dev, "%s 8 bits per word\n", __func__);
+	}
+
+	if (((pspi->bits_per_word) != PCH_8_BPW) &&
+	    ((pspi->bits_per_word != PCH_16_BPW))) {
+		dev_err(&pspi->dev, "%s Invalid bits per word\n", __func__);
+		return -EINVAL;
+	}
+
+	/*Check baud rate setting */
+	/*if baud rate of chip is greater than
+	   max we can support,return error */
+	if ((pspi->max_speed_hz) > PCH_MAX_BAUDRATE) {
+		dev_err(&pspi->dev, "%s Invalid Baud rate\n", __func__);
+		return -EINVAL;
+	}
+
+	dev_info(&pspi->dev, "%s MODE = %x\n", __func__,
+		((pspi->mode) & (SPI_CPOL | SPI_CPHA)));
+
+	if (((pspi->mode) & SPI_LSB_FIRST) != 0)
+		dev_dbg(&pspi->dev, "%s LSB_FIRST\n", __func__);
+	else
+		dev_dbg(&pspi->dev, "%s MSB_FIRST\n", __func__);
+
+	return 0;
+}
+
+static int pch_spi_transfer(struct spi_device *pspi, struct spi_message *pmsg)
+{
+
+	struct spi_transfer *p_transfer;
+	struct pch_spi_data *p_data = spi_master_get_devdata(pspi->master);
+	int retval;
+	int ret;
+
+	ret = mutex_lock_interruptible(&pch_spi_mutex);
+	if (ret) {
+		retval = -ERESTARTSYS;
+		goto err_return;
+	}
+
+	/*validate spi message and baud rate */
+	if (unlikely((list_empty(&pmsg->transfers) == 1) ||
+		     ((pspi->max_speed_hz) == 0))) {
+		if (list_empty(&pmsg->transfers) == 1)
+			dev_err(&pspi->dev, "%s list empty\n", __func__);
+
+		if ((pspi->max_speed_hz) == 0) {
+			dev_err(&pspi->dev, "%s pch_spi_tranfer maxspeed=%d\n",
+					__func__, (pspi->max_speed_hz));
+		}
+		dev_err(&pspi->dev, "%s returning EINVAL\n", __func__);
+
+		retval = -EINVAL;
+		goto err_return_mutex;
+	}
+
+	dev_dbg(&pspi->dev,
+	    "%s Transfer List not empty. Transfer Speed is set.\n", __func__);
+
+	/*validate Tx/Rx buffers and Transfer length */
+	list_for_each_entry(p_transfer, &pmsg->transfers,
+						 transfer_list) {
+		if ((((p_transfer->tx_buf) == NULL)
+		     && ((p_transfer->rx_buf) == NULL))
+		    || (p_transfer->len == 0)) {
+			if (((p_transfer->tx_buf) == NULL)
+			    && ((p_transfer->rx_buf) == NULL)) {
+				dev_err(&pspi->dev,
+					"%s Tx and Rx buffer NULL\n", __func__);
+			}
+
+			if (p_transfer->len == 0) {
+				dev_err(&pspi->dev, "%s Transfer"
+						" length invalid\n", __func__);
+			}
+
+			dev_err(&pspi->dev, "%s returning EINVAL\n", __func__);
+
+			retval = -EINVAL;
+			goto err_return_mutex;
+		}
+
+		dev_dbg(&pspi->dev,
+		    "%s Tx/Rx buffer valid. Transfer length valid\n", __func__);
+
+		/*if baud rate hs been specified validate the same */
+		if (p_transfer->speed_hz) {
+			if ((p_transfer->speed_hz) >
+			    PCH_MAX_BAUDRATE) {
+				retval = -EINVAL;
+				dev_err(&pspi->dev,
+				  "%s Invalid Baud rate\n", __func__);
+				goto err_return_mutex;
+			}
+		}
+
+		/*if bits per word has been specified validate the same */
+		if (p_transfer->bits_per_word) {
+			if ((p_transfer->bits_per_word != PCH_8_BPW)
+			    && (p_transfer->bits_per_word != PCH_16_BPW)) {
+				retval = -EINVAL;
+				dev_err(&pspi->dev,
+					"%s Invalid bits per word\n", __func__);
+				goto err_return_mutex;
+			}
+		}
+	}
+
+	spin_lock(&p_data->lock);
+
+	/*We won't process any messages if we have been asked to terminate */
+
+	if (STATUS_EXITING == (p_data->status)) {
+		spin_unlock(&p_data->lock);
+		dev_err(&pspi->dev, "%s status = STATUS_EXITING.\n", __func__);
+		retval = -ESHUTDOWN;
+		goto err_return_spinlock;
+	}
+
+	/*If suspended ,return -EINVAL */
+	if (p_data->p_board_dat->suspend_sts == true) {
+		dev_err(&pspi->dev,
+			"%s bSuspending= true returning EINVAL\n", __func__);
+		spin_unlock(&p_data->lock);
+		retval = -EINVAL;
+		goto err_return_spinlock;
+	}
+
+	/*set status of message */
+	pmsg->actual_length = 0;
+
+	dev_dbg(&pspi->dev, "%s - pmsg->status =%d\n", __func__, pmsg->status);
+
+	pmsg->status = -EINPROGRESS;
+
+	/*add message to queue */
+	list_add_tail(&pmsg->queue, &p_data->queue);
+
+	dev_dbg(&pspi->dev, "%s - Invoked list_add_tail\n", __func__);
+
+	/*schedule work queue to run */
+	queue_work(p_data->p_wk_q, &p_data->work);
+
+	dev_dbg(&pspi->dev, "%s - Invoked queue work\n", __func__);
+
+	retval = 0;
+
+err_return_spinlock:
+	spin_unlock(&p_data->lock);
+err_return_mutex:
+	mutex_unlock(&pch_spi_mutex);
+err_return:
+	dev_dbg(&pspi->dev, "%s RETURN=%d\n", __func__, retval);
+	return retval;
+}
+
+static void pch_spi_cleanup(struct spi_device *pspi)
+{
+	dev_dbg(&pspi->dev, "%s\n", __func__);
+}
+
+static inline void pch_spi_deselect_chip(struct pch_spi_data *p_data)
+{
+	if (p_data->p_current_chip != NULL)
+		p_data->p_current_chip = NULL;
+}
+
+static inline void pch_spi_select_chip(struct pch_spi_data *p_data,
+				       struct spi_device *pspi)
+{
+	if ((p_data->p_current_chip) != NULL) {
+		if ((pspi->chip_select) != (p_data->n_curnt_chip)) {
+			dev_dbg(&pspi->dev,
+				"%s : different slave-Invoking\n", __func__);
+			pch_spi_deselect_chip(p_data);
+		}
+	}
+
+	p_data->p_current_chip = pspi;
+
+	p_data->n_curnt_chip = p_data->p_current_chip->chip_select;
+
+	dev_dbg(&pspi->dev, "%s :Invoking pch_spi_setup_transfer\n", __func__);
+	pch_spi_setup_transfer(pspi);
+}
+
+static void pch_spi_set_tx(struct pch_spi_data *p_data, int *bpw,
+						struct spi_message **ppmsg)
+{
+	int b_mem_fail;
+	int size;
+	u32 n_writes;
+	int j;
+	struct spi_message *pmsg;
+	pmsg = *ppmsg;
+
+	/*set baud rate if needed */
+	if (p_data->p_cur_trans->speed_hz) {
+		dev_dbg(&p_data->p_master->dev,
+			"%s:pctrldatasetting baud rate\n", __func__);
+		pch_spi_set_baud_rate(p_data->p_master,
+				      (p_data->p_cur_trans->speed_hz));
+	}
+
+	/*set bits per word if needed */
+	if ((p_data->p_cur_trans->bits_per_word) &&
+	    ((p_data->p_current_msg->spi->bits_per_word) !=
+	     (p_data->p_cur_trans->bits_per_word))) {
+		dev_dbg(&p_data->p_master->dev,
+			"%s:setting bits per word\n", __func__);
+		pch_spi_set_bits_per_word(p_data->p_master,
+					  (p_data->p_cur_trans->
+					   bits_per_word));
+		*bpw = p_data->p_cur_trans->bits_per_word;
+	} else {
+		*bpw = p_data->p_current_msg->spi->bits_per_word;
+	}
+
+	/*reset Tx/Rx index */
+	p_data->tx_index = 0;
+
+	p_data->rx_index = 0;
+
+	if (PCH_8_BPW == *bpw) {
+		/*8 bits per word */
+		p_data->bpw_len = p_data->p_cur_trans->len;
+	} else {
+		/*16 bits per word */
+		p_data->bpw_len = (p_data->p_cur_trans->len) / 2;
+	}
+
+	b_mem_fail = false;
+
+	/*find alloc size */
+	size = (p_data->p_cur_trans->len) *
+					(sizeof(*(p_data->pkt_tx_buff)));
+	/*allocate memory for pkt_tx_buff & pkt_rx_buffer */
+	p_data->pkt_tx_buff = kzalloc(size, GFP_KERNEL);
+
+	if (p_data->pkt_tx_buff != NULL) {
+		p_data->pkt_rx_buff = kzalloc(size, GFP_KERNEL);
+
+		if (p_data->pkt_rx_buff == NULL) {
+			b_mem_fail = true;
+			kfree(p_data->pkt_tx_buff);
+		}
+	} else {
+		b_mem_fail = true;
+	}
+
+	if (b_mem_fail) {
+		/*flush queue and set status of all transfers
+		 to -ENOMEM */
+		dev_err(&p_data->p_master->dev,
+		    "Kzalloc fail in %s messages\n", __func__);
+		list_for_each_entry(pmsg, p_data->queue.next, queue) {
+			pmsg->status = -ENOMEM;
+
+			if (pmsg->complete != 0)
+				pmsg->complete(pmsg->context);
+
+			/*delete from queue */
+			list_del_init(&pmsg->queue);
+		}
+
+		return;
+	}
+
+	/*copy Tx Data */
+	if ((p_data->p_cur_trans->tx_buf) != NULL) {
+		for (j = 0; j < (p_data->bpw_len); j++) {
+			if (PCH_8_BPW == *bpw) {
+				p_data->pkt_tx_buff[j] =
+				    (((u8 *) (p_data->p_cur_trans->
+					      tx_buf))[j]);
+				dev_dbg(&p_data->p_master->dev, "%s=%x\n",
+					__func__, (p_data->pkt_tx_buff[j]));
+			} else {
+				p_data->pkt_tx_buff[j] =
+				    ((u16 *) (p_data->p_cur_trans->
+					      tx_buf))[j];
+				dev_dbg(&p_data->p_master->dev,
+					"%s xmt data = %x\n", __func__,
+					(p_data->pkt_tx_buff[j]));
+			}
+		}
+	}
+
+	/*if len greater than PCH_MAX_FIFO_DEPTH,
+				write 16,else len bytes */
+	if ((p_data->bpw_len) > PCH_MAX_FIFO_DEPTH)
+		n_writes = PCH_MAX_FIFO_DEPTH;
+	else
+		n_writes = (p_data->bpw_len);
+
+	dev_dbg(&p_data->p_master->dev,
+	  "\n%s:Pulling down SSN low - writing 0x2 to SSNXCR\n", __func__);
+	pch_spi_writereg(p_data->p_master, PCH_SSNXCR, SSN_LOW);
+
+	dev_dbg(&p_data->p_master->dev,
+		"\n%s:Writing %u items\n", __func__, n_writes);
+
+	for (j = 0; j < n_writes; j++) {
+		pch_spi_writereg(p_data->p_master, PCH_SPDWR,
+				 p_data->pkt_tx_buff[j]);
+	}
+
+	/*update tx_index */
+	p_data->tx_index = j;
+	dev_dbg(&p_data->p_master->dev, "%s:enabling interrupts\n", __func__);
+
+	/*reset transfer complete flag */
+	p_data->b_transfer_complete = false;
+	p_data->b_transfer_active = true;
+	dev_dbg(&p_data->p_master->dev,
+		"%s set p_data->b_transfer_active = true\n", __func__);
+
+}
+
+
+static void pch_spi_nomore_transfer(struct pch_spi_data *p_data,
+						struct spi_message *pmsg)
+{
+	dev_dbg(&p_data->p_master->dev,
+			"%s:no more transfers in this message\n", __func__);
+	/*Invoke complete callback
+	 [To the spi core..indicating end of transfer] */
+	p_data->p_current_msg->status = 0;
+
+	if ((p_data->p_current_msg->complete) != 0) {
+		dev_dbg(&p_data->p_master->dev,
+				"%s:Invoking callback of SPI core\n", __func__);
+		p_data->p_current_msg->complete(p_data->p_current_msg->context);
+	}
+
+	/*update status in global variable */
+	p_data->bcurrent_msg_processing = false;
+
+	dev_dbg(&p_data->p_master->dev,
+		"%s:p_data->bcurrent_msg_processing = false\n", __func__);
+
+	p_data->p_current_msg = NULL;
+	p_data->p_cur_trans = NULL;
+
+	/*check if we have items in list and not
+					 suspending */
+	/*return 1 if list empty */
+	if ((list_empty(&p_data->queue) == 0) &&
+	    (p_data->p_board_dat->suspend_sts == false)
+	    && (p_data->status != STATUS_EXITING)) {
+		/*We have some more work to do (either
+			there is more tranint bpw;sfer
+		   requests in the current message or
+			there are more messages) */
+		dev_dbg(&p_data->p_master->dev,
+		    "%s:we have pending messages-Invoking queue_work\n",
+								__func__);
+		queue_work(p_data->p_wk_q, &p_data->work);
+	}
+
+	/*check if suspend has been initiated;	if yes flush queue */
+	else if ((p_data->p_board_dat->suspend_sts == true) ||
+					(p_data->status == STATUS_EXITING)) {
+		dev_dbg(&p_data->p_master->dev,
+				"%s suspend/remove initiated, flushing queue\n",
+				__func__);
+		list_for_each_entry(pmsg, p_data->queue.next, queue) {
+			pmsg->status = -EIO;
+
+			if (pmsg->complete != 0)
+				pmsg->complete(pmsg->context);
+
+			/*delete from queue */
+			list_del_init(&pmsg->queue);
+		}
+	}
+}
+
+static void pch_spi_set_ir(struct pch_spi_data *p_data)
+{
+	/*enable interrupts */
+	if ((p_data->bpw_len) > PCH_MAX_FIFO_DEPTH) {
+		/*set receive threhold to PCH_RX_THOLD */
+		pch_spi_set_threshold(p_data->p_current_chip,
+				      PCH_RX_THOLD,
+				      PCH_RX);
+		/*enable FI and RFI interrupts */
+		pch_spi_enable_interrupts(p_data->p_master,
+					  PCH_RFI |
+					  PCH_FI);
+	} else {
+		/*set receive threhold to maximum */
+		pch_spi_set_threshold(p_data->p_current_chip,
+				      PCH_RX_THOLD_MAX,
+				      PCH_RX);
+		/*enable FI interrupt */
+		pch_spi_enable_interrupts(p_data->p_master,
+					  PCH_FI);
+	}
+
+	dev_dbg(&p_data->p_master->dev,
+	    "%s:invoking pch_spi_set_enable to enable SPI\n", __func__);
+
+	pch_spi_set_enable((p_data->p_current_chip), true);
+
+	/*Wait until the transfer completes; go to sleep after
+				 initiating the transfer. */
+	dev_dbg(&p_data->p_master->dev,
+			    "%s:waiting for transfer to get over\n", __func__);
+
+	wait_event_interruptible(p_data->wait,
+					p_data->b_transfer_complete != false);
+
+	pch_spi_writereg(p_data->p_master, PCH_SSNXCR, SSN_NO_CONTROL);
+	dev_dbg(&p_data->p_master->dev,
+	    "%s:no more control over SSN-writing 0x0 to SSNXCR."
+	    "transmit over.", __func__);
+
+	p_data->b_transfer_active = false;
+	dev_dbg(&p_data->p_master->dev,
+		"%s set p_data->b_transfer_active = false\n", __func__);
+
+	/*clear all interrupts */
+	pch_spi_writereg(p_data->p_master, PCH_SPSR,
+			 (pch_spi_readreg(p_data->p_master, PCH_SPSR)));
+	/*disable interrupts */
+	pch_spi_disable_interrupts(p_data->p_master, PCH_ALL);
+}
+
+static void pch_spi_copy_rx_data(struct pch_spi_data *p_data, int bpw)
+{
+	int j;
+	/*copy Rx Data */
+	if ((p_data->p_cur_trans->rx_buf) != NULL) {
+		for (j = 0; j < (p_data->bpw_len); j++) {
+			if (PCH_8_BPW == bpw) {
+				((u8 *) (p_data->p_cur_trans->rx_buf))[j] =
+				    (u8) ((p_data->pkt_rx_buff[j]) & 0xFF);
+
+				dev_dbg(&p_data->p_master->dev,
+					"rcv data in %s =%x\n", __func__,
+					(p_data->pkt_rx_buff[j]));
+
+			} else {
+				((u16 *) (p_data->p_cur_trans->rx_buf))[j] =
+				    (u16) (p_data->pkt_rx_buff[j]);
+				dev_dbg(&p_data->p_master->dev,
+					"rcv data in %s = %x\n", __func__,
+					(p_data->pkt_rx_buff[j]));
+			}
+		}
+	}
+}
+
+
+static void pch_spi_process_messages(struct work_struct *pwork)
+{
+	struct spi_message *pmsg;
+	int bpw;
+
+	struct pch_spi_data *p_data =
+				container_of(pwork, struct pch_spi_data, work);
+	dev_dbg(&p_data->p_master->dev,
+					"%s p_data initialized\n", __func__);
+
+	spin_lock(&p_data->lock);
+
+	/*check if suspend has been initiated;if yes flush queue */
+	if ((p_data->p_board_dat->suspend_sts)
+	    || (p_data->status == STATUS_EXITING)) {
+		dev_dbg(&p_data->p_master->dev,
+		    "%s suspend/remove initiated,flushing queue\n", __func__);
+		list_for_each_entry(pmsg, p_data->queue.next, queue) {
+			pmsg->status = -EIO;
+
+			if (pmsg->complete != 0)
+				pmsg->complete(pmsg->context);
+
+			/*delete from queue */
+			list_del_init(&pmsg->queue);
+		}
+
+		spin_unlock(&p_data->lock);
+	} else {
+		p_data->bcurrent_msg_processing = true;
+		dev_dbg(&p_data->p_master->dev,
+		    "%s Set p_data->bcurrent_msg_processing= true\n",
+		    __func__);
+
+		/*Get the message from the queue and delete it from there. */
+		p_data->p_current_msg =
+		    list_entry(p_data->queue.next, struct spi_message,
+			       queue);
+		dev_dbg(&p_data->p_master->dev,
+				"%s :Got new message from queue\n", __func__);
+		list_del_init(&p_data->p_current_msg->queue);
+
+		p_data->p_current_msg->status = 0;
+
+		dev_dbg(&p_data->p_master->dev,
+				"%s :Invoking pch_spi_select_chip\n", __func__);
+		pch_spi_select_chip(p_data, p_data->p_current_msg->spi);
+
+		spin_unlock(&p_data->lock);
+
+		do {
+			/*If we are already processing a message get the next
+			transfer structure from the message otherwise retrieve
+			the 1st transfer request from the message. */
+			spin_lock(&p_data->lock);
+
+			if (p_data->p_cur_trans == NULL) {
+				p_data->p_cur_trans =
+				    list_entry(p_data->p_current_msg->transfers.
+					       next, struct spi_transfer,
+					       transfer_list);
+				dev_dbg(&p_data->p_master->dev,
+					"%s :Getting 1st transfer message\n",
+					__func__);
+			} else {
+				p_data->p_cur_trans =
+				    list_entry(p_data->p_cur_trans->
+					       transfer_list.next,
+					       struct spi_transfer,
+					       transfer_list);
+				dev_dbg(&p_data->p_master->dev,
+					"%s :Getting next transfer message\n",
+					__func__);
+			}
+
+			spin_unlock(&p_data->lock);
+
+			pch_spi_set_tx(p_data, &bpw, &pmsg);
+
+			/*Control interrupt*/
+			pch_spi_set_ir(p_data);
+
+			/*Disable SPI transfer */
+			dev_dbg(&p_data->p_master->dev,
+				"%s:invoking pch_spi_set_enable to "
+				"disable spi transfer\n", __func__);
+			pch_spi_set_enable((p_data->p_current_chip), false);
+
+			/*clear FIFO */
+			dev_dbg(&p_data->p_master->dev,
+			    "%s:invoking pch_spi_clear_fifo to clear fifo\n",
+			    __func__);
+			pch_spi_clear_fifo(p_data->p_master);
+
+			/*copy Rx Data */
+			pch_spi_copy_rx_data(p_data, bpw);
+
+			/*free memory */
+			kfree(p_data->pkt_rx_buff);
+			if (p_data->pkt_rx_buff)
+				p_data->pkt_rx_buff = NULL;
+
+			kfree(p_data->pkt_tx_buff);
+			if (p_data->pkt_tx_buff)
+				p_data->pkt_tx_buff = NULL;
+
+			/*increment message count */
+			p_data->p_current_msg->actual_length +=
+			    p_data->p_cur_trans->len;
+
+			dev_dbg(&p_data->p_master->dev,
+				"%s:p_data->p_current_msg->actual_length=%d\n",
+				__func__, p_data->p_current_msg->actual_length);
+
+			/*check for delay */
+			if (p_data->p_cur_trans->delay_usecs) {
+				dev_dbg
+				    (&p_data->p_master->dev, "%s:"
+					"delay in usec=%d\n", __func__,
+				     p_data->p_cur_trans->delay_usecs);
+				udelay(p_data->p_cur_trans->delay_usecs);
+			}
+
+			spin_lock(&p_data->lock);
+
+			/*No more transfer in this message. */
+			if ((p_data->p_cur_trans->transfer_list.next) ==
+			    &(p_data->p_current_msg->transfers)) {
+				pch_spi_nomore_transfer(p_data, pmsg);
+			}
+
+			spin_unlock(&p_data->lock);
+
+		} while ((p_data->p_cur_trans) != NULL);
+	}
+}
+
+static void pch_spi_free_resources(struct pch_spi_board_data *p_board_dat)
+{
+	int i;
+
+	dev_dbg(&p_board_dat->pdev->dev, "%s ENTRY\n", __func__);
+
+	/* free workqueue */
+	for (i = 0; i < PCH_MAX_DEV; i++) {
+		if (p_board_dat->p_data[i]->p_wk_q != NULL) {
+			destroy_workqueue(p_board_dat->p_data[i]->p_wk_q);
+			p_board_dat->p_data[i]->p_wk_q = NULL;
+			dev_dbg(&p_board_dat->pdev->dev,
+				"%s destroy_workqueue invoked successfully\n",
+				__func__);
+		}
+	}
+
+	/* disable interrupts & free IRQ */
+	if (p_board_dat->irq_reg_sts == true) {
+		/* disable interrupts */
+		for (i = 0; i < PCH_MAX_DEV; i++) {
+			pch_spi_disable_interrupts(p_board_dat->p_data[i]->
+						   p_master, PCH_ALL);
+			dev_dbg(&p_board_dat->pdev->dev,
+				"%s pch_spi_disable_interrupts invoked "
+				"successfully\n", __func__);
+		}
+
+		/* free IRQ */
+		free_irq(p_board_dat->pdev->irq, (void *)p_board_dat);
+
+		dev_dbg(&p_board_dat->pdev->dev,
+				"%s free_irq invoked successfully\n", __func__);
+
+		p_board_dat->irq_reg_sts = false;
+	}
+
+	/* unmap PCI base address */
+	if ((p_board_dat->p_data[0]->io_remap_addr) != 0) {
+		pci_iounmap(p_board_dat->pdev,
+			    p_board_dat->p_data[0]->io_remap_addr);
+
+		for (i = 0; i < PCH_MAX_DEV; i++)
+			p_board_dat->p_data[i]->io_remap_addr = 0;
+
+		dev_dbg(&p_board_dat->pdev->dev,
+			"%s pci_iounmap invoked successfully\n", __func__);
+	}
+
+	/* release PCI region */
+	if (p_board_dat->pci_req_sts == true) {
+		pci_release_regions(p_board_dat->pdev);
+		dev_dbg(&p_board_dat->pdev->dev,
+		    "%s pci_release_regions invoked successfully\n", __func__);
+		p_board_dat->pci_req_sts = false;
+	}
+}
+
+static int pch_spi_get_resources(struct pch_spi_board_data *p_board_dat)
+{
+	int i, j, m, n;
+	void __iomem *io_remap_addr;
+	s32 retval;
+	dev_dbg(&p_board_dat->pdev->dev, "%s ENTRY\n", __func__);
+
+	for (i = 0; i < PCH_MAX_DEV; i++) {
+		/* iniatize queue of pending messages */
+		INIT_LIST_HEAD(&(p_board_dat->p_data[i]->queue));
+		dev_dbg(&p_board_dat->pdev->dev,
+		    "%s p_data[i]->queue initialized using INIT_LIST_HEAD\n",
+		    __func__);
+
+		/* initialize spin locks */
+		spin_lock_init(&(p_board_dat->p_data[i]->lock));
+		dev_dbg(&p_board_dat->pdev->dev,
+		    "%s p_data[i]->lock initialized using spin_lock_init\n",
+		    __func__);
+
+		/* set channel status */
+		p_board_dat->p_data[i]->status = STATUS_RUNNING;
+		dev_dbg(&p_board_dat->pdev->dev,
+			"%s p_data[i]->status = STATUS_RUNNING\n", __func__);
+
+		/* initialize work structure */
+		INIT_WORK(&(p_board_dat->p_data[i]->work),
+			  pch_spi_process_messages);
+		dev_dbg(&p_board_dat->pdev->dev,
+			"%s p_data[i]->work initialized using INIT_WORK\n",
+			__func__);
+
+		/* initialize wait queues */
+		init_waitqueue_head(&(p_board_dat->p_data[i]->wait));
+		dev_dbg(&p_board_dat->pdev->dev, "%s p_data[i]->wait "
+			"initialized using init_waitqueue_head\n", __func__);
+	}
+
+	for (j = 0, retval = 0; j < PCH_MAX_DEV; j++) {
+		/* create workqueue */
+		p_board_dat->p_data[j]->p_wk_q =
+				    create_singlethread_workqueue(DRIVER_NAME);
+
+		if ((p_board_dat->p_data[j]->p_wk_q) == NULL) {
+			dev_err(&p_board_dat->pdev->dev,
+				"%s create_singlet hread_workqueue failed\n",
+				__func__);
+			retval = -EBUSY;
+			goto err_return;
+		}
+	}
+
+	if (retval != 0)
+		goto err_return;
+
+	dev_dbg(&p_board_dat->pdev->dev,
+			"%s create_singlethread_workqueue success\n", __func__);
+
+	retval = pci_request_regions(p_board_dat->pdev, DRIVER_NAME);
+	if (retval != 0) {
+		dev_err(&p_board_dat->pdev->dev,
+					"%s request_region failed\n", __func__);
+		goto err_return;
+	}
+
+	dev_dbg(&p_board_dat->pdev->dev,
+			"%s request_region returned=%d\n", __func__, retval);
+
+	p_board_dat->pci_req_sts = true;
+	dev_dbg(&p_board_dat->pdev->dev,
+			"%s p_data->pci_req_sts = true\n", __func__);
+
+	io_remap_addr = pci_iomap(p_board_dat->pdev, 1, 0);
+
+	if (io_remap_addr == 0) {
+		dev_err(&p_board_dat->pdev->dev,
+					"%s pci_iomap failed\n", __func__);
+		retval = -ENOMEM;
+		goto err_return;
+	}
+
+	dev_dbg(&p_board_dat->pdev->dev,
+			"%s pci_iomap success PCI Base address=%x\n", __func__,
+			(u32)(io_remap_addr));
+
+	/* calculate base address for all channels */
+	for (m = 0; m < PCH_MAX_DEV; m++) {
+		p_board_dat->p_data[m]->io_remap_addr =
+		    io_remap_addr + (PCH_ADDRESS_SIZE * m);
+		dev_dbg(&p_board_dat->pdev->dev,
+		    "%s Base address for channel %d= %x\n", __func__, m ,
+		    (u32)(p_board_dat->p_data[m]->io_remap_addr));
+	}
+
+	/* reset PCH SPI h/w */
+	for (n = 0; n < PCH_MAX_DEV; n++) {
+		pch_spi_reset(p_board_dat->p_data[n]->p_master);
+		dev_dbg(&p_board_dat->pdev->dev,
+			"%s pch_spi_reset invoked successfully\n", __func__);
+	}
+
+	/* register IRQ */
+	retval = request_irq(p_board_dat->pdev->irq, pch_spi_handler,
+			 IRQF_SHARED, DRIVER_NAME, (void *)p_board_dat);
+	if (retval != 0) {
+		dev_err(&p_board_dat->pdev->dev,
+					"%s request_irq failed\n", __func__);
+		goto err_return;
+	}
+
+	dev_dbg(&p_board_dat->pdev->dev, "%s request_irq returned=%d\n",
+							__func__, retval);
+
+	p_board_dat->irq_reg_sts = true;
+	dev_dbg(&p_board_dat->pdev->dev,
+			"%s p_data->irq_reg_sts=true\n", __func__);
+
+err_return:
+	if (retval != 0) {
+		dev_err(&p_board_dat->pdev->dev,
+			"%s FAIL:invoking pch_spi_free_resources\n", __func__);
+		pch_spi_free_resources(p_board_dat);
+	}
+
+	dev_dbg(&p_board_dat->pdev->dev, "%s Return=%d\n", __func__, retval);
+
+	return retval;
+}
+
+static int
+pch_spi_check_request_pending(struct pch_spi_board_data *p_board_dat)
+{
+	int i;
+	int sts;
+	u16 count;
+
+	for (i = 0; i < PCH_MAX_DEV; i++) {
+		count = 500;
+		spin_lock(&(p_board_dat->p_data[i]->lock));
+		p_board_dat->p_data[i]->status = STATUS_EXITING;
+
+		while ((list_empty(&(p_board_dat->p_data[i]->queue)) == 0) &&
+		       (--count)) {
+			dev_dbg(&p_board_dat->pdev->dev,
+					"%s :queue not empty\n", __func__);
+			spin_unlock(&(p_board_dat->p_data[i]->lock));
+			msleep(PCH_SLEEP_TIME);
+			spin_lock(&(p_board_dat->p_data[i]->lock));
+		}
+
+		spin_unlock(&(p_board_dat->p_data[i]->lock));
+
+		if (count) {
+			sts = 0;
+			dev_dbg(&p_board_dat->pdev->dev,
+						"%s :queue empty\n", __func__);
+		} else {
+			sts = -EBUSY;
+		}
+	}
+
+	dev_dbg(&p_board_dat->pdev->dev, "%s : EXIT=%d\n", __func__, sts);
+
+	return sts;
+}
+
+static int pch_spi_probe(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+
+	struct spi_master *p_master[PCH_MAX_DEV];
+
+	struct pch_spi_board_data *p_board_dat;
+	int retval, i, j, k, l, m;
+	int spi_alloc_num, spi_master_num;
+
+	dev_dbg(&pdev->dev, "%s ENTRY\n", __func__);
+	/* initialize the call back function */
+	pch_spi_entcb(pch_spi_callback);
+	dev_dbg(&pdev->dev, "%s invoked pch_spi_entcb\n", __func__);
+
+	/* allocate memory for private data */
+	p_board_dat = kmalloc(sizeof(struct pch_spi_board_data), GFP_KERNEL);
+
+	if (p_board_dat == NULL) {
+		dev_err(&pdev->dev,
+		    " %s memory allocation for private data failed\n",
+		    __func__);
+		retval = -ENOMEM;
+		goto err_kmalloc;
+	}
+
+	dev_dbg(&pdev->dev,
+		"%s memory allocation for private data success\n", __func__);
+
+	/* enable PCI device */
+	retval = pci_enable_device(pdev);
+	if (retval != 0) {
+		dev_err(&pdev->dev, "%s pci_enable_device FAILED\n", __func__);
+
+		goto err_pci_en_device;
+	}
+
+	dev_dbg(&pdev->dev, "%s pci_enable_device returned=%d\n",
+							__func__, retval);
+
+	p_board_dat->pdev = pdev;
+
+	/* alllocate memory for SPI master */
+	for (i = 0, spi_alloc_num = 0; i < PCH_MAX_DEV; i++, spi_alloc_num++) {
+		p_master[i] = spi_alloc_master(&pdev->dev,
+				     sizeof(struct pch_spi_data));
+
+		if (p_master[i] == NULL) {
+			retval = -ENOMEM;
+			dev_err(&pdev->dev, "%s [ch=%d]Fail.\n", __func__, i);
+			goto err_spi_alloc_master;
+		}
+	}
+
+	dev_dbg(&pdev->dev,
+			"%s spi_alloc_master returned non NULL\n", __func__);
+
+	/* initialize members of SPI master */
+	for (j = 0, spi_master_num = 0; j < PCH_MAX_DEV;
+							j++, spi_master_num++) {
+		p_master[j]->bus_num = 0;
+		p_master[j]->num_chipselect = PCH_MAX_CS;
+		p_master[j]->setup = pch_spi_setup;
+		dev_dbg(&pdev->dev,
+			"%s setup member of SPI master initialized\n",
+			__func__);
+		p_master[j]->transfer = pch_spi_transfer;
+		dev_dbg(&pdev->dev,
+		    "%s transfer member of SPI master initialized\n", __func__);
+		p_master[j]->cleanup = pch_spi_cleanup;
+		dev_dbg(&pdev->dev,
+		    "%s cleanup member of SPI master initialized\n", __func__);
+
+		p_board_dat->p_data[j] =
+				spi_master_get_devdata(p_master[j]);
+
+		p_board_dat->p_data[j]->p_master = p_master[j];
+		p_board_dat->p_data[j]->n_curnt_chip = 255;
+		p_board_dat->p_data[j]->p_current_chip = NULL;
+		p_board_dat->p_data[j]->b_transfer_complete = false;
+		p_board_dat->p_data[j]->pkt_tx_buff = NULL;
+		p_board_dat->p_data[j]->pkt_rx_buff = NULL;
+		p_board_dat->p_data[j]->tx_index = 0;
+		p_board_dat->p_data[j]->rx_index = 0;
+		p_board_dat->p_data[j]->b_transfer_active = false;
+		p_board_dat->p_data[j]->p_board_dat = p_board_dat;
+		p_board_dat->suspend_sts = false;
+
+		/* Register the controller with the SPI core. */
+		retval = spi_register_master(p_master[j]);
+		if (retval != 0) {
+			dev_err(&pdev->dev,
+			   "%s spi_register_master FAILED\n", __func__);
+			goto err_spi_reg_master;
+		}
+
+		dev_dbg(&pdev->dev, "%s spi_register_master returned=%d\n",
+							__func__, retval);
+	}
+
+	/* allocate resources for PCH SPI */
+	retval = pch_spi_get_resources(p_board_dat);
+	if (retval != 0) {
+		dev_err(&pdev->dev, "%s fail(retval=%d)\n",
+							__func__, retval);
+		goto err_spi_get_resources;
+	}
+
+	dev_dbg(&pdev->dev, "%s pch_spi_get_resources returned=%d\n",
+							__func__, retval);
+
+	/* save private data in dev */
+	pci_set_drvdata(pdev, (void *)p_board_dat);
+	dev_dbg(&pdev->dev, "%s invoked pci_set_drvdata\n", __func__);
+
+	/* set master mode */
+	for (k = 0; k < PCH_MAX_DEV; k++) {
+		pch_spi_set_master_mode(p_master[k]);
+		dev_dbg(&pdev->dev,
+			"%s invoked pch_spi_set_master_mode\n", __func__);
+	}
+
+	return 0;
+
+err_spi_get_resources:
+	for (l = 0; l <= spi_master_num; l++)
+		spi_unregister_master(p_master[l]);
+err_spi_reg_master:
+err_spi_alloc_master:
+	for (m = 0; m <= spi_alloc_num; m++)
+		spi_master_put(p_master[m]);
+	pci_disable_device(pdev);
+err_pci_en_device:
+	kfree(p_board_dat);
+err_kmalloc:
+	return retval;
+}
+
+static void pch_spi_remove(struct pci_dev *pdev)
+{
+	int i;
+
+	struct pch_spi_board_data *p_board_dat = pci_get_drvdata(pdev);
+
+	dev_dbg(&pdev->dev, "%s ENTRY\n", __func__);
+
+	if (p_board_dat != NULL) {
+		dev_dbg(&pdev->dev, "%s invoked pci_get_drvdata\n", __func__);
+
+		/* check for any pending messages */
+		if ((-EBUSY) == pch_spi_check_request_pending(p_board_dat)) {
+			dev_dbg(&pdev->dev,
+			    "%s pch_spi_check_request_pending returned EBUSY\n",
+			    __func__);
+			/* no need to take any particular action;
+				proceed with remove even
+			   though queue is not empty */
+		}
+
+		dev_dbg(&pdev->dev,
+			"%s pch_spi_check_request_pending invoked\n", __func__);
+
+		/* Free resources allocated for PCH SPI */
+		pch_spi_free_resources(p_board_dat);
+		dev_dbg(&pdev->dev,
+			"%s invoked pch_spi_free_resources\n", __func__);
+
+		/* Unregister SPI master */
+		for (i = 0; i < PCH_MAX_DEV; i++) {
+			spi_unregister_master(p_board_dat->p_data[i]->
+					      p_master);
+			dev_dbg(&pdev->dev,
+				"%s invoked spi_unregister_master\n", __func__);
+		}
+
+		/* free memory for private data */
+		kfree(p_board_dat);
+
+		pci_set_drvdata(pdev, NULL);
+
+		dev_dbg(&pdev->dev,
+				"%s memory for private data freed\n", __func__);
+
+		/* disable PCI device */
+		pci_disable_device(pdev);
+
+		dev_dbg(&pdev->dev,
+				"%s invoked pci_disable_device\n", __func__);
+
+	} else {
+		dev_err(&pdev->dev,
+			"%s pci_get_drvdata returned NULL\n", __func__);
+	}
+}
+
+#ifdef CONFIG_PM
+static int pch_spi_suspend(struct pci_dev *pdev, pm_message_t state)
+{
+	int i;
+	u8 count;
+	s32 retval;
+
+	struct pch_spi_board_data *p_board_dat = pci_get_drvdata(pdev);
+
+	dev_dbg(&pdev->dev, "%s ENTRY\n", __func__);
+
+	if (p_board_dat == NULL) {
+		dev_err(&pdev->dev,
+			"%s pci_get_drvdata returned NULL\n", __func__);
+		retval = -EFAULT;
+	} else {
+		retval = 0;
+		dev_dbg(&pdev->dev,
+			"%s pci_get_drvdata invoked successfully\n", __func__);
+		p_board_dat->suspend_sts = true;
+		dev_dbg(&pdev->dev,
+			"%s p_board_dat->bSuspending set to true\n", __func__);
+
+		/* check if the current message is processed:
+		   Only after thats done the transfer will be suspended */
+		for (i = 0; i < PCH_MAX_DEV; i++) {
+			count = 255;
+
+			while ((--count) > 0) {
+				if (p_board_dat->p_data[i]->
+				    bcurrent_msg_processing == false) {
+					dev_dbg(&pdev->dev, "%s p_board_dat->"
+						"p_data->bCurrent_"
+						"msg_processing = false\n",
+						__func__);
+					break;
+				} else {
+					dev_dbg(&pdev->dev, "%s p_board_dat->"
+						"p_data->bCurrent_msg_"
+						"processing = true\n",
+						__func__);
+				}
+				msleep(PCH_SLEEP_TIME);
+			}
+		}
+
+		/* Free IRQ */
+		if (p_board_dat->irq_reg_sts == true) {
+			/* disable all interrupts */
+			for (i = 0; i < PCH_MAX_DEV; i++) {
+				pch_spi_disable_interrupts(p_board_dat->
+							   p_data[i]->
+							   p_master,
+							   PCH_ALL);
+				pch_spi_reset(p_board_dat->p_data[i]->
+					      p_master);
+				dev_dbg(&pdev->dev,
+					"%s pch_spi_disable_interrupts invoked"
+					"successfully\n", __func__);
+			}
+
+			free_irq(p_board_dat->pdev->irq, (void *)p_board_dat);
+
+			p_board_dat->irq_reg_sts = false;
+			dev_dbg(&pdev->dev,
+				"%s free_irq invoked successfully."
+				"p_data->irq_reg_sts = false\n",
+				__func__);
+		}
+
+		/* save config space */
+		retval = pci_save_state(pdev);
+
+		if (retval == 0) {
+			dev_dbg(&pdev->dev, "%s pci_save_state returned=%d\n",
+							__func__, retval);
+			/* disable PM notifications */
+			pci_enable_wake(pdev, PCI_D3hot, 0);
+			dev_dbg(&pdev->dev,
+				"%s pci_enable_wake invoked successfully\n",
+				__func__);
+			/* disable PCI device */
+			pci_disable_device(pdev);
+			dev_dbg(&pdev->dev,
+				"%s pci_disable_device invoked successfully\n",
+				__func__);
+			/* move device to D3hot  state */
+			pci_set_power_state(pdev, PCI_D3hot);
+			dev_dbg(&pdev->dev,
+				"%s pci_set_power_state invoked successfully\n",
+				__func__);
+		} else {
+			dev_err(&pdev->dev,
+					"%s pci_save_state failed\n", __func__);
+		}
+	}
+
+	dev_dbg(&pdev->dev, "%s return=%d\n", __func__, retval);
+
+	return retval;
+}
+
+static int pch_spi_resume(struct pci_dev *pdev)
+{
+	int i;
+	s32 retval;
+
+	struct pch_spi_board_data *p_board_dat = pci_get_drvdata(pdev);
+	dev_dbg(&pdev->dev, "%s ENTRY\n", __func__);
+
+	if (p_board_dat == NULL) {
+		dev_err(&pdev->dev,
+			"%s pci_get_drvdata returned NULL\n", __func__);
+		retval = -EFAULT;
+	} else {
+		retval = 0;
+		/* move device to DO power state */
+		pci_set_power_state(pdev, PCI_D0);
+		dev_dbg(&pdev->dev,
+		    "%s pci_set_power_state invoked successfully\n", __func__);
+
+		/* restore state */
+		pci_restore_state(pdev);
+		dev_dbg(&pdev->dev,
+		    "%s pci_restore_state invoked successfully\n", __func__);
+
+		retval = pci_enable_device(pdev);
+		if (retval < 0) {
+			dev_err(&pdev->dev,
+				"%s pci_enable_device failed\n", __func__);
+		} else {
+			dev_dbg(&pdev->dev,
+					"%s pci_enable_device returned=%d\n",
+					__func__, retval);
+
+			/* disable PM notifications */
+			pci_enable_wake(pdev, PCI_D3hot, 0);
+			dev_dbg(&pdev->dev,
+			 "%s pci_enable_wake invoked successfully\n", __func__);
+
+			/* register IRQ handler */
+			if ((p_board_dat->irq_reg_sts) != true) {
+				/* register IRQ */
+				retval = request_irq(p_board_dat->pdev->irq,
+						 pch_spi_handler, IRQF_SHARED,
+						 DRIVER_NAME,
+						 p_board_dat);
+				if (retval < 0) {
+					dev_err(&pdev->dev,
+					   "%s request_irq failed\n", __func__);
+				} else {
+					dev_dbg(&pdev->dev, "%s request_irq"
+					   " returned=%d\n", __func__, retval);
+					p_board_dat->irq_reg_sts = true;
+
+					/* reset PCH SPI h/w */
+					for (i = 0; i < PCH_MAX_DEV; i++) {
+						pch_spi_reset(p_board_dat->
+							      p_data[i]->
+							      p_master);
+						dev_dbg(&pdev->dev,
+						  "pdev->dev, %s pch_spi_reset "
+						  "invoked successfully\n",
+						  __func__);
+						pch_spi_set_master_mode
+						    (p_board_dat->p_data[i]->
+						     p_master);
+						dev_dbg(&pdev->dev,
+						  "%s pch_spi_set_master_mode "
+						  "invoked successfully\n",
+						  __func__);
+					}
+
+					/* set suspend status to false */
+					p_board_dat->suspend_sts = false;
+
+					dev_dbg(&pdev->dev, "%s set p_board_dat"
+					   "->bSuspending = false\n", __func__);
+				}
+			}
+		}
+	}
+
+	dev_dbg(&pdev->dev, "%s returning=%d\n", __func__, retval);
+
+	return retval;
+}
+#else
+#define pch_spi_suspend NULL
+#define pch_spi_resume NULL
+
+#endif
+
+static struct pci_driver pch_spi_pcidev = {
+	.name = "pch_spi",
+	.id_table = pch_spi_pcidev_id,
+	.probe = pch_spi_probe,
+	.remove = pch_spi_remove,
+	.suspend = pch_spi_suspend,
+	.resume = pch_spi_resume,
+};
+
+static int __init pch_spi_init(void)
+{
+	return pci_register_driver(&pch_spi_pcidev);
+}
+
+
+static void __exit pch_spi_exit(void)
+{
+	pci_unregister_driver(&pch_spi_pcidev);
+}
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("PCH SPI PCI Driver");
+module_init(pch_spi_init);
+module_exit(pch_spi_exit);
+
diff --git a/drivers/spi/pch_spi_platform_devices.c b/drivers/spi/pch_spi_platform_devices.c
new file mode 100644
index 0000000..a0d6488
--- /dev/null
+++ b/drivers/spi/pch_spi_platform_devices.c
@@ -0,0 +1,56 @@ 
+/*
+ * Copyright (C) 2010 OKI SEMICONDUCTOR Co., LTD.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * 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/spi/spidev.h>
+#include <linux/device.h>
+#include <linux/spi/spi.h>
+
+static struct spi_board_info pch_spi_slaves[] = {
+	{
+	 .modalias = "spidev",
+	 .max_speed_hz = 1000000,
+	 .bus_num = 0,
+	 .chip_select = 0,
+	 .platform_data = NULL,
+	 .mode = SPI_MODE_0,
+	 },
+#if (CONFIG_PCH_SPI_PLATFORM_DEVICE_COUNT - 1)
+	{
+	 .modalias = "spidev",
+	 .max_speed_hz = 1000000,
+	 .bus_num = 1,
+	 .chip_select = 1,
+	 .platform_data = NULL,
+	 .mode = SPI_MODE_0,
+	 },
+#endif
+};
+
+static __init int Load(void)
+{
+	int iRetVal = -1;
+
+	if (!spi_register_board_info
+	    (pch_spi_slaves, ARRAY_SIZE(pch_spi_slaves)))
+		iRetVal = 0;
+
+	return iRetVal;
+}
+
+module_init(Load);
+MODULE_LICENSE("GPL");