spi: reorganize drivers

Sort the SPI makefile and enforce the naming convention spi_*.c for
spi drivers.

This change also rolls the contents of atmel_spi.h into the .c file
since there is only one user of that particular include file.

v2: - Use 'spi-' prefix instead of 'spi_' to match what seems to be
      be the predominant pattern for subsystem prefixes.
    - Clean up filenames in Kconfig and header comment blocks

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Wolfram Sang <w.sang@pengutronix.de>
Acked-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 0 insertions, 936 deletions

diff --git a/drivers/spi/dw_spi.c b/drivers/spi/dw_spi.c
deleted file mode 100644
index 919fa9d9e16b..000000000000
--- a/drivers/spi/dw_spi.c
+++ /dev/null
@@ -1,936 +0,0 @@
-/*
- * dw_spi.c - Designware SPI core controller driver (refer pxa2xx_spi.c)
- *
- * Copyright (c) 2009, Intel Corporation.
- *
- * 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/dma-mapping.h>
-#include <linux/interrupt.h>
-#include <linux/highmem.h>
-#include <linux/delay.h>
-#include <linux/slab.h>
-#include <linux/spi/spi.h>
-
-#include "dw_spi.h"
-
-#ifdef CONFIG_DEBUG_FS
-#include <linux/debugfs.h>
-#endif
-
-#define START_STATE	((void *)0)
-#define RUNNING_STATE	((void *)1)
-#define DONE_STATE	((void *)2)
-#define ERROR_STATE	((void *)-1)
-
-#define QUEUE_RUNNING	0
-#define QUEUE_STOPPED	1
-
-#define MRST_SPI_DEASSERT	0
-#define MRST_SPI_ASSERT		1
-
-/* Slave spi_dev related */
-struct chip_data {
-	u16 cr0;
-	u8 cs;			/* chip select pin */
-	u8 n_bytes;		/* current is a 1/2/4 byte op */
-	u8 tmode;		/* TR/TO/RO/EEPROM */
-	u8 type;		/* SPI/SSP/MicroWire */
-
-	u8 poll_mode;		/* 1 means use poll mode */
-
-	u32 dma_width;
-	u32 rx_threshold;
-	u32 tx_threshold;
-	u8 enable_dma;
-	u8 bits_per_word;
-	u16 clk_div;		/* baud rate divider */
-	u32 speed_hz;		/* baud rate */
-	void (*cs_control)(u32 command);
-};
-
-#ifdef CONFIG_DEBUG_FS
-static int spi_show_regs_open(struct inode *inode, struct file *file)
-{
-	file->private_data = inode->i_private;
-	return 0;
-}
-
-#define SPI_REGS_BUFSIZE	1024
-static ssize_t  spi_show_regs(struct file *file, char __user *user_buf,
-				size_t count, loff_t *ppos)
-{
-	struct dw_spi *dws;
-	char *buf;
-	u32 len = 0;
-	ssize_t ret;
-
-	dws = file->private_data;
-
-	buf = kzalloc(SPI_REGS_BUFSIZE, GFP_KERNEL);
-	if (!buf)
-		return 0;
-
-	len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
-			"MRST SPI0 registers:\n");
-	len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
-			"=================================\n");
-	len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
-			"CTRL0: \t\t0x%08x\n", dw_readl(dws, ctrl0));
-	len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
-			"CTRL1: \t\t0x%08x\n", dw_readl(dws, ctrl1));
-	len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
-			"SSIENR: \t0x%08x\n", dw_readl(dws, ssienr));
-	len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
-			"SER: \t\t0x%08x\n", dw_readl(dws, ser));
-	len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
-			"BAUDR: \t\t0x%08x\n", dw_readl(dws, baudr));
-	len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
-			"TXFTLR: \t0x%08x\n", dw_readl(dws, txfltr));
-	len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
-			"RXFTLR: \t0x%08x\n", dw_readl(dws, rxfltr));
-	len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
-			"TXFLR: \t\t0x%08x\n", dw_readl(dws, txflr));
-	len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
-			"RXFLR: \t\t0x%08x\n", dw_readl(dws, rxflr));
-	len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
-			"SR: \t\t0x%08x\n", dw_readl(dws, sr));
-	len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
-			"IMR: \t\t0x%08x\n", dw_readl(dws, imr));
-	len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
-			"ISR: \t\t0x%08x\n", dw_readl(dws, isr));
-	len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
-			"DMACR: \t\t0x%08x\n", dw_readl(dws, dmacr));
-	len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
-			"DMATDLR: \t0x%08x\n", dw_readl(dws, dmatdlr));
-	len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
-			"DMARDLR: \t0x%08x\n", dw_readl(dws, dmardlr));
-	len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
-			"=================================\n");
-
-	ret =  simple_read_from_buffer(user_buf, count, ppos, buf, len);
-	kfree(buf);
-	return ret;
-}
-
-static const struct file_operations mrst_spi_regs_ops = {
-	.owner		= THIS_MODULE,
-	.open		= spi_show_regs_open,
-	.read		= spi_show_regs,
-	.llseek		= default_llseek,
-};
-
-static int mrst_spi_debugfs_init(struct dw_spi *dws)
-{
-	dws->debugfs = debugfs_create_dir("mrst_spi", NULL);
-	if (!dws->debugfs)
-		return -ENOMEM;
-
-	debugfs_create_file("registers", S_IFREG | S_IRUGO,
-		dws->debugfs, (void *)dws, &mrst_spi_regs_ops);
-	return 0;
-}
-
-static void mrst_spi_debugfs_remove(struct dw_spi *dws)
-{
-	if (dws->debugfs)
-		debugfs_remove_recursive(dws->debugfs);
-}
-
-#else
-static inline int mrst_spi_debugfs_init(struct dw_spi *dws)
-{
-	return 0;
-}
-
-static inline void mrst_spi_debugfs_remove(struct dw_spi *dws)
-{
-}
-#endif /* CONFIG_DEBUG_FS */
-
-/* Return the max entries we can fill into tx fifo */
-static inline u32 tx_max(struct dw_spi *dws)
-{
-	u32 tx_left, tx_room, rxtx_gap;
-
-	tx_left = (dws->tx_end - dws->tx) / dws->n_bytes;
-	tx_room = dws->fifo_len - dw_readw(dws, txflr);
-
-	/*
-	 * Another concern is about the tx/rx mismatch, we
-	 * though to use (dws->fifo_len - rxflr - txflr) as
-	 * one maximum value for tx, but it doesn't cover the
-	 * data which is out of tx/rx fifo and inside the
-	 * shift registers. So a control from sw point of
-	 * view is taken.
-	 */
-	rxtx_gap =  ((dws->rx_end - dws->rx) - (dws->tx_end - dws->tx))
-			/ dws->n_bytes;
-
-	return min3(tx_left, tx_room, (u32) (dws->fifo_len - rxtx_gap));
-}
-
-/* Return the max entries we should read out of rx fifo */
-static inline u32 rx_max(struct dw_spi *dws)
-{
-	u32 rx_left = (dws->rx_end - dws->rx) / dws->n_bytes;
-
-	return min(rx_left, (u32)dw_readw(dws, rxflr));
-}
-
-static void dw_writer(struct dw_spi *dws)
-{
-	u32 max = tx_max(dws);
-	u16 txw = 0;
-
-	while (max--) {
-		/* Set the tx word if the transfer's original "tx" is not null */
-		if (dws->tx_end - dws->len) {
-			if (dws->n_bytes == 1)
-				txw = *(u8 *)(dws->tx);
-			else
-				txw = *(u16 *)(dws->tx);
-		}
-		dw_writew(dws, dr, txw);
-		dws->tx += dws->n_bytes;
-	}
-}
-
-static void dw_reader(struct dw_spi *dws)
-{
-	u32 max = rx_max(dws);
-	u16 rxw;
-
-	while (max--) {
-		rxw = dw_readw(dws, dr);
-		/* Care rx only if the transfer's original "rx" is not null */
-		if (dws->rx_end - dws->len) {
-			if (dws->n_bytes == 1)
-				*(u8 *)(dws->rx) = rxw;
-			else
-				*(u16 *)(dws->rx) = rxw;
-		}
-		dws->rx += dws->n_bytes;
-	}
-}
-
-static void *next_transfer(struct dw_spi *dws)
-{
-	struct spi_message *msg = dws->cur_msg;
-	struct spi_transfer *trans = dws->cur_transfer;
-
-	/* Move to next transfer */
-	if (trans->transfer_list.next != &msg->transfers) {
-		dws->cur_transfer =
-			list_entry(trans->transfer_list.next,
-					struct spi_transfer,
-					transfer_list);
-		return RUNNING_STATE;
-	} else
-		return DONE_STATE;
-}
-
-/*
- * Note: first step is the protocol driver prepares
- * a dma-capable memory, and this func just need translate
- * the virt addr to physical
- */
-static int map_dma_buffers(struct dw_spi *dws)
-{
-	if (!dws->cur_msg->is_dma_mapped
-		|| !dws->dma_inited
-		|| !dws->cur_chip->enable_dma
-		|| !dws->dma_ops)
-		return 0;
-
-	if (dws->cur_transfer->tx_dma)
-		dws->tx_dma = dws->cur_transfer->tx_dma;
-
-	if (dws->cur_transfer->rx_dma)
-		dws->rx_dma = dws->cur_transfer->rx_dma;
-
-	return 1;
-}
-
-/* Caller already set message->status; dma and pio irqs are blocked */
-static void giveback(struct dw_spi *dws)
-{
-	struct spi_transfer *last_transfer;
-	unsigned long flags;
-	struct spi_message *msg;
-
-	spin_lock_irqsave(&dws->lock, flags);
-	msg = dws->cur_msg;
-	dws->cur_msg = NULL;
-	dws->cur_transfer = NULL;
-	dws->prev_chip = dws->cur_chip;
-	dws->cur_chip = NULL;
-	dws->dma_mapped = 0;
-	queue_work(dws->workqueue, &dws->pump_messages);
-	spin_unlock_irqrestore(&dws->lock, flags);
-
-	last_transfer = list_entry(msg->transfers.prev,
-					struct spi_transfer,
-					transfer_list);
-
-	if (!last_transfer->cs_change && dws->cs_control)
-		dws->cs_control(MRST_SPI_DEASSERT);
-
-	msg->state = NULL;
-	if (msg->complete)
-		msg->complete(msg->context);
-}
-
-static void int_error_stop(struct dw_spi *dws, const char *msg)
-{
-	/* Stop the hw */
-	spi_enable_chip(dws, 0);
-
-	dev_err(&dws->master->dev, "%s\n", msg);
-	dws->cur_msg->state = ERROR_STATE;
-	tasklet_schedule(&dws->pump_transfers);
-}
-
-void dw_spi_xfer_done(struct dw_spi *dws)
-{
-	/* Update total byte transferred return count actual bytes read */
-	dws->cur_msg->actual_length += dws->len;
-
-	/* Move to next transfer */
-	dws->cur_msg->state = next_transfer(dws);
-
-	/* Handle end of message */
-	if (dws->cur_msg->state == DONE_STATE) {
-		dws->cur_msg->status = 0;
-		giveback(dws);
-	} else
-		tasklet_schedule(&dws->pump_transfers);
-}
-EXPORT_SYMBOL_GPL(dw_spi_xfer_done);
-
-static irqreturn_t interrupt_transfer(struct dw_spi *dws)
-{
-	u16 irq_status = dw_readw(dws, isr);
-
-	/* Error handling */
-	if (irq_status & (SPI_INT_TXOI | SPI_INT_RXOI | SPI_INT_RXUI)) {
-		dw_readw(dws, txoicr);
-		dw_readw(dws, rxoicr);
-		dw_readw(dws, rxuicr);
-		int_error_stop(dws, "interrupt_transfer: fifo overrun/underrun");
-		return IRQ_HANDLED;
-	}
-
-	dw_reader(dws);
-	if (dws->rx_end == dws->rx) {
-		spi_mask_intr(dws, SPI_INT_TXEI);
-		dw_spi_xfer_done(dws);
-		return IRQ_HANDLED;
-	}
-	if (irq_status & SPI_INT_TXEI) {
-		spi_mask_intr(dws, SPI_INT_TXEI);
-		dw_writer(dws);
-		/* Enable TX irq always, it will be disabled when RX finished */
-		spi_umask_intr(dws, SPI_INT_TXEI);
-	}
-
-	return IRQ_HANDLED;
-}
-
-static irqreturn_t dw_spi_irq(int irq, void *dev_id)
-{
-	struct dw_spi *dws = dev_id;
-	u16 irq_status = dw_readw(dws, isr) & 0x3f;
-
-	if (!irq_status)
-		return IRQ_NONE;
-
-	if (!dws->cur_msg) {
-		spi_mask_intr(dws, SPI_INT_TXEI);
-		return IRQ_HANDLED;
-	}
-
-	return dws->transfer_handler(dws);
-}
-
-/* Must be called inside pump_transfers() */
-static void poll_transfer(struct dw_spi *dws)
-{
-	do {
-		dw_writer(dws);
-		dw_reader(dws);
-		cpu_relax();
-	} while (dws->rx_end > dws->rx);
-
-	dw_spi_xfer_done(dws);
-}
-
-static void pump_transfers(unsigned long data)
-{
-	struct dw_spi *dws = (struct dw_spi *)data;
-	struct spi_message *message = NULL;
-	struct spi_transfer *transfer = NULL;
-	struct spi_transfer *previous = NULL;
-	struct spi_device *spi = NULL;
-	struct chip_data *chip = NULL;
-	u8 bits = 0;
-	u8 imask = 0;
-	u8 cs_change = 0;
-	u16 txint_level = 0;
-	u16 clk_div = 0;
-	u32 speed = 0;
-	u32 cr0 = 0;
-
-	/* Get current state information */
-	message = dws->cur_msg;
-	transfer = dws->cur_transfer;
-	chip = dws->cur_chip;
-	spi = message->spi;
-
-	if (unlikely(!chip->clk_div))
-		chip->clk_div = dws->max_freq / chip->speed_hz;
-
-	if (message->state == ERROR_STATE) {
-		message->status = -EIO;
-		goto early_exit;
-	}
-
-	/* Handle end of message */
-	if (message->state == DONE_STATE) {
-		message->status = 0;
-		goto early_exit;
-	}
-
-	/* Delay if requested at end of transfer*/
-	if (message->state == RUNNING_STATE) {
-		previous = list_entry(transfer->transfer_list.prev,
-					struct spi_transfer,
-					transfer_list);
-		if (previous->delay_usecs)
-			udelay(previous->delay_usecs);
-	}
-
-	dws->n_bytes = chip->n_bytes;
-	dws->dma_width = chip->dma_width;
-	dws->cs_control = chip->cs_control;
-
-	dws->rx_dma = transfer->rx_dma;
-	dws->tx_dma = transfer->tx_dma;
-	dws->tx = (void *)transfer->tx_buf;
-	dws->tx_end = dws->tx + transfer->len;
-	dws->rx = transfer->rx_buf;
-	dws->rx_end = dws->rx + transfer->len;
-	dws->cs_change = transfer->cs_change;
-	dws->len = dws->cur_transfer->len;
-	if (chip != dws->prev_chip)
-		cs_change = 1;
-
-	cr0 = chip->cr0;
-
-	/* Handle per transfer options for bpw and speed */
-	if (transfer->speed_hz) {
-		speed = chip->speed_hz;
-
-		if (transfer->speed_hz != speed) {
-			speed = transfer->speed_hz;
-			if (speed > dws->max_freq) {
-				printk(KERN_ERR "MRST SPI0: unsupported"
-					"freq: %dHz\n", speed);
-				message->status = -EIO;
-				goto early_exit;
-			}
-
-			/* clk_div doesn't support odd number */
-			clk_div = dws->max_freq / speed;
-			clk_div = (clk_div + 1) & 0xfffe;
-
-			chip->speed_hz = speed;
-			chip->clk_div = clk_div;
-		}
-	}
-	if (transfer->bits_per_word) {
-		bits = transfer->bits_per_word;
-
-		switch (bits) {
-		case 8:
-		case 16:
-			dws->n_bytes = dws->dma_width = bits >> 3;
-			break;
-		default:
-			printk(KERN_ERR "MRST SPI0: unsupported bits:"
-				"%db\n", bits);
-			message->status = -EIO;
-			goto early_exit;
-		}
-
-		cr0 = (bits - 1)
-			| (chip->type << SPI_FRF_OFFSET)
-			| (spi->mode << SPI_MODE_OFFSET)
-			| (chip->tmode << SPI_TMOD_OFFSET);
-	}
-	message->state = RUNNING_STATE;
-
-	/*
-	 * Adjust transfer mode if necessary. Requires platform dependent
-	 * chipselect mechanism.
-	 */
-	if (dws->cs_control) {
-		if (dws->rx && dws->tx)
-			chip->tmode = SPI_TMOD_TR;
-		else if (dws->rx)
-			chip->tmode = SPI_TMOD_RO;
-		else
-			chip->tmode = SPI_TMOD_TO;
-
-		cr0 &= ~SPI_TMOD_MASK;
-		cr0 |= (chip->tmode << SPI_TMOD_OFFSET);
-	}
-
-	/* Check if current transfer is a DMA transaction */
-	dws->dma_mapped = map_dma_buffers(dws);
-
-	/*
-	 * Interrupt mode
-	 * we only need set the TXEI IRQ, as TX/RX always happen syncronizely
-	 */
-	if (!dws->dma_mapped && !chip->poll_mode) {
-		int templen = dws->len / dws->n_bytes;
-		txint_level = dws->fifo_len / 2;
-		txint_level = (templen > txint_level) ? txint_level : templen;
-
-		imask |= SPI_INT_TXEI | SPI_INT_TXOI | SPI_INT_RXUI | SPI_INT_RXOI;
-		dws->transfer_handler = interrupt_transfer;
-	}
-
-	/*
-	 * Reprogram registers only if
-	 *	1. chip select changes
-	 *	2. clk_div is changed
-	 *	3. control value changes
-	 */
-	if (dw_readw(dws, ctrl0) != cr0 || cs_change || clk_div || imask) {
-		spi_enable_chip(dws, 0);
-
-		if (dw_readw(dws, ctrl0) != cr0)
-			dw_writew(dws, ctrl0, cr0);
-
-		spi_set_clk(dws, clk_div ? clk_div : chip->clk_div);
-		spi_chip_sel(dws, spi->chip_select);
-
-		/* Set the interrupt mask, for poll mode just disable all int */
-		spi_mask_intr(dws, 0xff);
-		if (imask)
-			spi_umask_intr(dws, imask);
-		if (txint_level)
-			dw_writew(dws, txfltr, txint_level);
-
-		spi_enable_chip(dws, 1);
-		if (cs_change)
-			dws->prev_chip = chip;
-	}
-
-	if (dws->dma_mapped)
-		dws->dma_ops->dma_transfer(dws, cs_change);
-
-	if (chip->poll_mode)
-		poll_transfer(dws);
-
-	return;
-
-early_exit:
-	giveback(dws);
-	return;
-}
-
-static void pump_messages(struct work_struct *work)
-{
-	struct dw_spi *dws =
-		container_of(work, struct dw_spi, pump_messages);
-	unsigned long flags;
-
-	/* Lock queue and check for queue work */
-	spin_lock_irqsave(&dws->lock, flags);
-	if (list_empty(&dws->queue) || dws->run == QUEUE_STOPPED) {
-		dws->busy = 0;
-		spin_unlock_irqrestore(&dws->lock, flags);
-		return;
-	}
-
-	/* Make sure we are not already running a message */
-	if (dws->cur_msg) {
-		spin_unlock_irqrestore(&dws->lock, flags);
-		return;
-	}
-
-	/* Extract head of queue */
-	dws->cur_msg = list_entry(dws->queue.next, struct spi_message, queue);
-	list_del_init(&dws->cur_msg->queue);
-
-	/* Initial message state*/
-	dws->cur_msg->state = START_STATE;
-	dws->cur_transfer = list_entry(dws->cur_msg->transfers.next,
-						struct spi_transfer,
-						transfer_list);
-	dws->cur_chip = spi_get_ctldata(dws->cur_msg->spi);
-
-	/* Mark as busy and launch transfers */
-	tasklet_schedule(&dws->pump_transfers);
-
-	dws->busy = 1;
-	spin_unlock_irqrestore(&dws->lock, flags);
-}
-
-/* spi_device use this to queue in their spi_msg */
-static int dw_spi_transfer(struct spi_device *spi, struct spi_message *msg)
-{
-	struct dw_spi *dws = spi_master_get_devdata(spi->master);
-	unsigned long flags;
-
-	spin_lock_irqsave(&dws->lock, flags);
-
-	if (dws->run == QUEUE_STOPPED) {
-		spin_unlock_irqrestore(&dws->lock, flags);
-		return -ESHUTDOWN;
-	}
-
-	msg->actual_length = 0;
-	msg->status = -EINPROGRESS;
-	msg->state = START_STATE;
-
-	list_add_tail(&msg->queue, &dws->queue);
-
-	if (dws->run == QUEUE_RUNNING && !dws->busy) {
-
-		if (dws->cur_transfer || dws->cur_msg)
-			queue_work(dws->workqueue,
-					&dws->pump_messages);
-		else {
-			/* If no other data transaction in air, just go */
-			spin_unlock_irqrestore(&dws->lock, flags);
-			pump_messages(&dws->pump_messages);
-			return 0;
-		}
-	}
-
-	spin_unlock_irqrestore(&dws->lock, flags);
-	return 0;
-}
-
-/* This may be called twice for each spi dev */
-static int dw_spi_setup(struct spi_device *spi)
-{
-	struct dw_spi_chip *chip_info = NULL;
-	struct chip_data *chip;
-
-	if (spi->bits_per_word != 8 && spi->bits_per_word != 16)
-		return -EINVAL;
-
-	/* Only alloc on first setup */
-	chip = spi_get_ctldata(spi);
-	if (!chip) {
-		chip = kzalloc(sizeof(struct chip_data), GFP_KERNEL);
-		if (!chip)
-			return -ENOMEM;
-	}
-
-	/*
-	 * Protocol drivers may change the chip settings, so...
-	 * if chip_info exists, use it
-	 */
-	chip_info = spi->controller_data;
-
-	/* chip_info doesn't always exist */
-	if (chip_info) {
-		if (chip_info->cs_control)
-			chip->cs_control = chip_info->cs_control;
-
-		chip->poll_mode = chip_info->poll_mode;
-		chip->type = chip_info->type;
-
-		chip->rx_threshold = 0;
-		chip->tx_threshold = 0;
-
-		chip->enable_dma = chip_info->enable_dma;
-	}
-
-	if (spi->bits_per_word <= 8) {
-		chip->n_bytes = 1;
-		chip->dma_width = 1;
-	} else if (spi->bits_per_word <= 16) {
-		chip->n_bytes = 2;
-		chip->dma_width = 2;
-	} else {
-		/* Never take >16b case for MRST SPIC */
-		dev_err(&spi->dev, "invalid wordsize\n");
-		return -EINVAL;
-	}
-	chip->bits_per_word = spi->bits_per_word;
-
-	if (!spi->max_speed_hz) {
-		dev_err(&spi->dev, "No max speed HZ parameter\n");
-		return -EINVAL;
-	}
-	chip->speed_hz = spi->max_speed_hz;
-
-	chip->tmode = 0; /* Tx & Rx */
-	/* Default SPI mode is SCPOL = 0, SCPH = 0 */
-	chip->cr0 = (chip->bits_per_word - 1)
-			| (chip->type << SPI_FRF_OFFSET)
-			| (spi->mode  << SPI_MODE_OFFSET)
-			| (chip->tmode << SPI_TMOD_OFFSET);
-
-	spi_set_ctldata(spi, chip);
-	return 0;
-}
-
-static void dw_spi_cleanup(struct spi_device *spi)
-{
-	struct chip_data *chip = spi_get_ctldata(spi);
-	kfree(chip);
-}
-
-static int __devinit init_queue(struct dw_spi *dws)
-{
-	INIT_LIST_HEAD(&dws->queue);
-	spin_lock_init(&dws->lock);
-
-	dws->run = QUEUE_STOPPED;
-	dws->busy = 0;
-
-	tasklet_init(&dws->pump_transfers,
-			pump_transfers,	(unsigned long)dws);
-
-	INIT_WORK(&dws->pump_messages, pump_messages);
-	dws->workqueue = create_singlethread_workqueue(
-					dev_name(dws->master->dev.parent));
-	if (dws->workqueue == NULL)
-		return -EBUSY;
-
-	return 0;
-}
-
-static int start_queue(struct dw_spi *dws)
-{
-	unsigned long flags;
-
-	spin_lock_irqsave(&dws->lock, flags);
-
-	if (dws->run == QUEUE_RUNNING || dws->busy) {
-		spin_unlock_irqrestore(&dws->lock, flags);
-		return -EBUSY;
-	}
-
-	dws->run = QUEUE_RUNNING;
-	dws->cur_msg = NULL;
-	dws->cur_transfer = NULL;
-	dws->cur_chip = NULL;
-	dws->prev_chip = NULL;
-	spin_unlock_irqrestore(&dws->lock, flags);
-
-	queue_work(dws->workqueue, &dws->pump_messages);
-
-	return 0;
-}
-
-static int stop_queue(struct dw_spi *dws)
-{
-	unsigned long flags;
-	unsigned limit = 50;
-	int status = 0;
-
-	spin_lock_irqsave(&dws->lock, flags);
-	dws->run = QUEUE_STOPPED;
-	while ((!list_empty(&dws->queue) || dws->busy) && limit--) {
-		spin_unlock_irqrestore(&dws->lock, flags);
-		msleep(10);
-		spin_lock_irqsave(&dws->lock, flags);
-	}
-
-	if (!list_empty(&dws->queue) || dws->busy)
-		status = -EBUSY;
-	spin_unlock_irqrestore(&dws->lock, flags);
-
-	return status;
-}
-
-static int destroy_queue(struct dw_spi *dws)
-{
-	int status;
-
-	status = stop_queue(dws);
-	if (status != 0)
-		return status;
-	destroy_workqueue(dws->workqueue);
-	return 0;
-}
-
-/* Restart the controller, disable all interrupts, clean rx fifo */
-static void spi_hw_init(struct dw_spi *dws)
-{
-	spi_enable_chip(dws, 0);
-	spi_mask_intr(dws, 0xff);
-	spi_enable_chip(dws, 1);
-
-	/*
-	 * Try to detect the FIFO depth if not set by interface driver,
-	 * the depth could be from 2 to 256 from HW spec
-	 */
-	if (!dws->fifo_len) {
-		u32 fifo;
-		for (fifo = 2; fifo <= 257; fifo++) {
-			dw_writew(dws, txfltr, fifo);
-			if (fifo != dw_readw(dws, txfltr))
-				break;
-		}
-
-		dws->fifo_len = (fifo == 257) ? 0 : fifo;
-		dw_writew(dws, txfltr, 0);
-	}
-}
-
-int __devinit dw_spi_add_host(struct dw_spi *dws)
-{
-	struct spi_master *master;
-	int ret;
-
-	BUG_ON(dws == NULL);
-
-	master = spi_alloc_master(dws->parent_dev, 0);
-	if (!master) {
-		ret = -ENOMEM;
-		goto exit;
-	}
-
-	dws->master = master;
-	dws->type = SSI_MOTO_SPI;
-	dws->prev_chip = NULL;
-	dws->dma_inited = 0;
-	dws->dma_addr = (dma_addr_t)(dws->paddr + 0x60);
-
-	ret = request_irq(dws->irq, dw_spi_irq, IRQF_SHARED,
-			"dw_spi", dws);
-	if (ret < 0) {
-		dev_err(&master->dev, "can not get IRQ\n");
-		goto err_free_master;
-	}
-
-	master->mode_bits = SPI_CPOL | SPI_CPHA;
-	master->bus_num = dws->bus_num;
-	master->num_chipselect = dws->num_cs;
-	master->cleanup = dw_spi_cleanup;
-	master->setup = dw_spi_setup;
-	master->transfer = dw_spi_transfer;
-
-	/* Basic HW init */
-	spi_hw_init(dws);
-
-	if (dws->dma_ops && dws->dma_ops->dma_init) {
-		ret = dws->dma_ops->dma_init(dws);
-		if (ret) {
-			dev_warn(&master->dev, "DMA init failed\n");
-			dws->dma_inited = 0;
-		}
-	}
-
-	/* Initial and start queue */
-	ret = init_queue(dws);
-	if (ret) {
-		dev_err(&master->dev, "problem initializing queue\n");
-		goto err_diable_hw;
-	}
-	ret = start_queue(dws);
-	if (ret) {
-		dev_err(&master->dev, "problem starting queue\n");
-		goto err_diable_hw;
-	}
-
-	spi_master_set_devdata(master, dws);
-	ret = spi_register_master(master);
-	if (ret) {
-		dev_err(&master->dev, "problem registering spi master\n");
-		goto err_queue_alloc;
-	}
-
-	mrst_spi_debugfs_init(dws);
-	return 0;
-
-err_queue_alloc:
-	destroy_queue(dws);
-	if (dws->dma_ops && dws->dma_ops->dma_exit)
-		dws->dma_ops->dma_exit(dws);
-err_diable_hw:
-	spi_enable_chip(dws, 0);
-	free_irq(dws->irq, dws);
-err_free_master:
-	spi_master_put(master);
-exit:
-	return ret;
-}
-EXPORT_SYMBOL_GPL(dw_spi_add_host);
-
-void __devexit dw_spi_remove_host(struct dw_spi *dws)
-{
-	int status = 0;
-
-	if (!dws)
-		return;
-	mrst_spi_debugfs_remove(dws);
-
-	/* Remove the queue */
-	status = destroy_queue(dws);
-	if (status != 0)
-		dev_err(&dws->master->dev, "dw_spi_remove: workqueue will not "
-			"complete, message memory not freed\n");
-
-	if (dws->dma_ops && dws->dma_ops->dma_exit)
-		dws->dma_ops->dma_exit(dws);
-	spi_enable_chip(dws, 0);
-	/* Disable clk */
-	spi_set_clk(dws, 0);
-	free_irq(dws->irq, dws);
-
-	/* Disconnect from the SPI framework */
-	spi_unregister_master(dws->master);
-}
-EXPORT_SYMBOL_GPL(dw_spi_remove_host);
-
-int dw_spi_suspend_host(struct dw_spi *dws)
-{
-	int ret = 0;
-
-	ret = stop_queue(dws);
-	if (ret)
-		return ret;
-	spi_enable_chip(dws, 0);
-	spi_set_clk(dws, 0);
-	return ret;
-}
-EXPORT_SYMBOL_GPL(dw_spi_suspend_host);
-
-int dw_spi_resume_host(struct dw_spi *dws)
-{
-	int ret;
-
-	spi_hw_init(dws);
-	ret = start_queue(dws);
-	if (ret)
-		dev_err(&dws->master->dev, "fail to start queue (%d)\n", ret);
-	return ret;
-}
-EXPORT_SYMBOL_GPL(dw_spi_resume_host);
-
-MODULE_AUTHOR("Feng Tang <feng.tang@intel.com>");
-MODULE_DESCRIPTION("Driver for DesignWare SPI controller core");
-MODULE_LICENSE("GPL v2");