caif-driver: Add CAIF-SPI Protocol driver.

This patch introduces the CAIF SPI Protocol Driver for
CAIF Link Layer.

This driver implements a platform driver to accommodate for a
platform specific SPI device. A general platform driver is not
possible as there are no SPI Slave side Kernel API defined.
A sample CAIF SPI Platform device can be found in
.../Documentation/networking/caif/spi_porting.txt

Signed-off-by: Sjur Braendeland <sjur.brandeland@stericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 847 insertions, 0 deletions

diff --git a/drivers/net/caif/caif_spi.c b/drivers/net/caif/caif_spi.c
new file mode 100644
index 000000000000..03049e86e8ae
--- /dev/null
+++ b/drivers/net/caif/caif_spi.c
@@ -0,0 +1,847 @@
+/*
+ * Copyright (C) ST-Ericsson AB 2010
+ * Contact: Sjur Brendeland / sjur.brandeland@stericsson.com
+ * Author:  Daniel Martensson / Daniel.Martensson@stericsson.com
+ * License terms: GNU General Public License (GPL) version 2.
+ */
+
+#include <linux/version.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/string.h>
+#include <linux/workqueue.h>
+#include <linux/completion.h>
+#include <linux/list.h>
+#include <linux/interrupt.h>
+#include <linux/dma-mapping.h>
+#include <linux/delay.h>
+#include <linux/sched.h>
+#include <linux/debugfs.h>
+#include <linux/if_arp.h>
+#include <net/caif/caif_layer.h>
+#include <net/caif/caif_spi.h>
+
+#ifndef CONFIG_CAIF_SPI_SYNC
+#define FLAVOR "Flavour: Vanilla.\n"
+#else
+#define FLAVOR "Flavour: Master CMD&LEN at start.\n"
+#endif /* CONFIG_CAIF_SPI_SYNC */
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Daniel Martensson<daniel.martensson@stericsson.com>");
+MODULE_DESCRIPTION("CAIF SPI driver");
+
+static int spi_loop;
+module_param(spi_loop, bool, S_IRUGO);
+MODULE_PARM_DESC(spi_loop, "SPI running in loopback mode.");
+
+/* SPI frame alignment. */
+module_param(spi_frm_align, int, S_IRUGO);
+MODULE_PARM_DESC(spi_frm_align, "SPI frame alignment.");
+
+/* SPI padding options. */
+module_param(spi_up_head_align, int, S_IRUGO);
+MODULE_PARM_DESC(spi_up_head_align, "SPI uplink head alignment.");
+
+module_param(spi_up_tail_align, int, S_IRUGO);
+MODULE_PARM_DESC(spi_up_tail_align, "SPI uplink tail alignment.");
+
+module_param(spi_down_head_align, int, S_IRUGO);
+MODULE_PARM_DESC(spi_down_head_align, "SPI downlink head alignment.");
+
+module_param(spi_down_tail_align, int, S_IRUGO);
+MODULE_PARM_DESC(spi_down_tail_align, "SPI downlink tail alignment.");
+
+#ifdef CONFIG_ARM
+#define BYTE_HEX_FMT "%02X"
+#else
+#define BYTE_HEX_FMT "%02hhX"
+#endif
+
+#define SPI_MAX_PAYLOAD_SIZE 4096
+/*
+ * Threshold values for the SPI packet queue. Flowcontrol will be asserted
+ * when the number of packets exceeds HIGH_WATER_MARK. It will not be
+ * deasserted before the number of packets drops below LOW_WATER_MARK.
+ */
+#define LOW_WATER_MARK   100
+#define HIGH_WATER_MARK  (LOW_WATER_MARK*5)
+
+#ifdef CONFIG_UML
+
+/*
+ * We sometimes use UML for debugging, but it cannot handle
+ * dma_alloc_coherent so we have to wrap it.
+ */
+static inline void *dma_alloc(dma_addr_t *daddr)
+{
+	return kmalloc(SPI_DMA_BUF_LEN, GFP_KERNEL);
+}
+
+static inline void dma_free(void *cpu_addr, dma_addr_t handle)
+{
+	kfree(cpu_addr);
+}
+
+#else
+
+static inline void *dma_alloc(dma_addr_t *daddr)
+{
+	return dma_alloc_coherent(NULL, SPI_DMA_BUF_LEN, daddr,
+				GFP_KERNEL);
+}
+
+static inline void dma_free(void *cpu_addr, dma_addr_t handle)
+{
+	dma_free_coherent(NULL, SPI_DMA_BUF_LEN, cpu_addr, handle);
+}
+#endif	/* CONFIG_UML */
+
+#ifdef CONFIG_DEBUG_FS
+
+#define DEBUGFS_BUF_SIZE	4096
+
+static struct dentry *dbgfs_root;
+
+static inline void driver_debugfs_create(void)
+{
+	dbgfs_root = debugfs_create_dir(cfspi_spi_driver.driver.name, NULL);
+}
+
+static inline void driver_debugfs_remove(void)
+{
+	debugfs_remove(dbgfs_root);
+}
+
+static inline void dev_debugfs_rem(struct cfspi *cfspi)
+{
+	debugfs_remove(cfspi->dbgfs_frame);
+	debugfs_remove(cfspi->dbgfs_state);
+	debugfs_remove(cfspi->dbgfs_dir);
+}
+
+static int dbgfs_open(struct inode *inode, struct file *file)
+{
+	file->private_data = inode->i_private;
+	return 0;
+}
+
+static ssize_t dbgfs_state(struct file *file, char __user *user_buf,
+			   size_t count, loff_t *ppos)
+{
+	char *buf;
+	int len = 0;
+	ssize_t size;
+	struct cfspi *cfspi = (struct cfspi *)file->private_data;
+
+	buf = kzalloc(DEBUGFS_BUF_SIZE, GFP_KERNEL);
+	if (!buf)
+		return 0;
+
+	/* Print out debug information. */
+	len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
+			"CAIF SPI debug information:\n");
+
+	len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), FLAVOR);
+
+	len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
+			"STATE: %d\n", cfspi->dbg_state);
+	len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
+			"Previous CMD: 0x%x\n", cfspi->pcmd);
+	len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
+			"Current CMD: 0x%x\n", cfspi->cmd);
+	len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
+			"Previous TX len: %d\n", cfspi->tx_ppck_len);
+	len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
+			"Previous RX len: %d\n", cfspi->rx_ppck_len);
+	len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
+			"Current TX len: %d\n", cfspi->tx_cpck_len);
+	len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
+			"Current RX len: %d\n", cfspi->rx_cpck_len);
+	len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
+			"Next TX len: %d\n", cfspi->tx_npck_len);
+	len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
+			"Next RX len: %d\n", cfspi->rx_npck_len);
+
+	size = simple_read_from_buffer(user_buf, count, ppos, buf, len);
+	kfree(buf);
+
+	return size;
+}
+
+static ssize_t print_frame(char *buf, size_t size, char *frm,
+			   size_t count, size_t cut)
+{
+	int len = 0;
+	int i;
+	for (i = 0; i < count; i++) {
+		len += snprintf((buf + len), (size - len),
+					"[0x" BYTE_HEX_FMT "]",
+					frm[i]);
+		if ((i == cut) && (count > (cut * 2))) {
+			/* Fast forward. */
+			i = count - cut;
+			len += snprintf((buf + len), (size - len),
+					"--- %u bytes skipped ---\n",
+					(int)(count - (cut * 2)));
+		}
+
+		if ((!(i % 10)) && i) {
+			len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
+					"\n");
+		}
+	}
+	len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), "\n");
+	return len;
+}
+
+static ssize_t dbgfs_frame(struct file *file, char __user *user_buf,
+			   size_t count, loff_t *ppos)
+{
+	char *buf;
+	int len = 0;
+	ssize_t size;
+	struct cfspi *cfspi;
+
+	cfspi = (struct cfspi *)file->private_data;
+	buf = kzalloc(DEBUGFS_BUF_SIZE, GFP_KERNEL);
+	if (!buf)
+		return 0;
+
+	/* Print out debug information. */
+	len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
+			"Current frame:\n");
+
+	len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
+			"Tx data (Len: %d):\n", cfspi->tx_cpck_len);
+
+	len += print_frame((buf + len), (DEBUGFS_BUF_SIZE - len),
+			   cfspi->xfer.va_tx,
+			   (cfspi->tx_cpck_len + SPI_CMD_SZ), 100);
+
+	len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
+			"Rx data (Len: %d):\n", cfspi->rx_cpck_len);
+
+	len += print_frame((buf + len), (DEBUGFS_BUF_SIZE - len),
+			   cfspi->xfer.va_rx,
+			   (cfspi->rx_cpck_len + SPI_CMD_SZ), 100);
+
+	size = simple_read_from_buffer(user_buf, count, ppos, buf, len);
+	kfree(buf);
+
+	return size;
+}
+
+static const struct file_operations dbgfs_state_fops = {
+	.open = dbgfs_open,
+	.read = dbgfs_state,
+	.owner = THIS_MODULE
+};
+
+static const struct file_operations dbgfs_frame_fops = {
+	.open = dbgfs_open,
+	.read = dbgfs_frame,
+	.owner = THIS_MODULE
+};
+
+static inline void dev_debugfs_add(struct cfspi *cfspi)
+{
+	cfspi->dbgfs_dir = debugfs_create_dir(cfspi->pdev->name, dbgfs_root);
+	cfspi->dbgfs_state = debugfs_create_file("state", S_IRUGO,
+						 cfspi->dbgfs_dir, cfspi,
+						 &dbgfs_state_fops);
+	cfspi->dbgfs_frame = debugfs_create_file("frame", S_IRUGO,
+						 cfspi->dbgfs_dir, cfspi,
+						 &dbgfs_frame_fops);
+}
+
+inline void cfspi_dbg_state(struct cfspi *cfspi, int state)
+{
+	cfspi->dbg_state = state;
+};
+#else
+
+static inline void driver_debugfs_create(void)
+{
+}
+
+static inline void driver_debugfs_remove(void)
+{
+}
+
+static inline void dev_debugfs_add(struct cfspi *cfspi)
+{
+}
+
+static inline void dev_debugfs_rem(struct cfspi *cfspi)
+{
+}
+
+inline void cfspi_dbg_state(struct cfspi *cfspi, int state)
+{
+}
+#endif				/* CONFIG_DEBUG_FS */
+
+static LIST_HEAD(cfspi_list);
+static spinlock_t cfspi_list_lock;
+
+/* SPI uplink head alignment. */
+static ssize_t show_up_head_align(struct device_driver *driver, char *buf)
+{
+	return sprintf(buf, "%d\n", spi_up_head_align);
+}
+
+static DRIVER_ATTR(up_head_align, S_IRUSR, show_up_head_align, NULL);
+
+/* SPI uplink tail alignment. */
+static ssize_t show_up_tail_align(struct device_driver *driver, char *buf)
+{
+	return sprintf(buf, "%d\n", spi_up_tail_align);
+}
+
+static DRIVER_ATTR(up_tail_align, S_IRUSR, show_up_tail_align, NULL);
+
+/* SPI downlink head alignment. */
+static ssize_t show_down_head_align(struct device_driver *driver, char *buf)
+{
+	return sprintf(buf, "%d\n", spi_down_head_align);
+}
+
+static DRIVER_ATTR(down_head_align, S_IRUSR, show_down_head_align, NULL);
+
+/* SPI downlink tail alignment. */
+static ssize_t show_down_tail_align(struct device_driver *driver, char *buf)
+{
+	return sprintf(buf, "%d\n", spi_down_tail_align);
+}
+
+static DRIVER_ATTR(down_tail_align, S_IRUSR, show_down_tail_align, NULL);
+
+/* SPI frame alignment. */
+static ssize_t show_frame_align(struct device_driver *driver, char *buf)
+{
+	return sprintf(buf, "%d\n", spi_frm_align);
+}
+
+static DRIVER_ATTR(frame_align, S_IRUSR, show_frame_align, NULL);
+
+int cfspi_xmitfrm(struct cfspi *cfspi, u8 *buf, size_t len)
+{
+	u8 *dst = buf;
+	caif_assert(buf);
+
+	do {
+		struct sk_buff *skb;
+		struct caif_payload_info *info;
+		int spad = 0;
+		int epad;
+
+		skb = skb_dequeue(&cfspi->chead);
+		if (!skb)
+			break;
+
+		/*
+		 * Calculate length of frame including SPI padding.
+		 * The payload position is found in the control buffer.
+		 */
+		info = (struct caif_payload_info *)&skb->cb;
+
+		/*
+		 * Compute head offset i.e. number of bytes to add to
+		 * get the start of the payload aligned.
+		 */
+		if (spi_up_head_align) {
+			spad = 1 + ((info->hdr_len + 1) & spi_up_head_align);
+			*dst = (u8)(spad - 1);
+			dst += spad;
+		}
+
+		/* Copy in CAIF frame. */
+		skb_copy_bits(skb, 0, dst, skb->len);
+		dst += skb->len;
+		cfspi->ndev->stats.tx_packets++;
+		cfspi->ndev->stats.tx_bytes += skb->len;
+
+		/*
+		 * Compute tail offset i.e. number of bytes to add to
+		 * get the complete CAIF frame aligned.
+		 */
+		epad = (skb->len + spad) & spi_up_tail_align;
+		dst += epad;
+
+		dev_kfree_skb(skb);
+
+	} while ((dst - buf) < len);
+
+	return dst - buf;
+}
+
+int cfspi_xmitlen(struct cfspi *cfspi)
+{
+	struct sk_buff *skb = NULL;
+	int frm_len = 0;
+	int pkts = 0;
+
+	/*
+	 * Decommit previously commited frames.
+	 * skb_queue_splice_tail(&cfspi->chead,&cfspi->qhead)
+	 */
+	while (skb_peek(&cfspi->chead)) {
+		skb = skb_dequeue_tail(&cfspi->chead);
+		skb_queue_head(&cfspi->qhead, skb);
+	}
+
+	do {
+		struct caif_payload_info *info = NULL;
+		int spad = 0;
+		int epad = 0;
+
+		skb = skb_dequeue(&cfspi->qhead);
+		if (!skb)
+			break;
+
+		/*
+		 * Calculate length of frame including SPI padding.
+		 * The payload position is found in the control buffer.
+		 */
+		info = (struct caif_payload_info *)&skb->cb;
+
+		/*
+		 * Compute head offset i.e. number of bytes to add to
+		 * get the start of the payload aligned.
+		 */
+		if (spi_up_head_align)
+			spad = 1 + ((info->hdr_len + 1) & spi_up_head_align);
+
+		/*
+		 * Compute tail offset i.e. number of bytes to add to
+		 * get the complete CAIF frame aligned.
+		 */
+		epad = (skb->len + spad) & spi_up_tail_align;
+
+		if ((skb->len + spad + epad + frm_len) <= CAIF_MAX_SPI_FRAME) {
+			skb_queue_tail(&cfspi->chead, skb);
+			pkts++;
+			frm_len += skb->len + spad + epad;
+		} else {
+			/* Put back packet. */
+			skb_queue_head(&cfspi->qhead, skb);
+		}
+	} while (pkts <= CAIF_MAX_SPI_PKTS);
+
+	/*
+	 * Send flow on if previously sent flow off
+	 * and now go below the low water mark
+	 */
+	if (cfspi->flow_off_sent && cfspi->qhead.qlen < cfspi->qd_low_mark &&
+		cfspi->cfdev.flowctrl) {
+		cfspi->flow_off_sent = 0;
+		cfspi->cfdev.flowctrl(cfspi->ndev, 1);
+	}
+
+	return frm_len;
+}
+
+static void cfspi_ss_cb(bool assert, struct cfspi_ifc *ifc)
+{
+	struct cfspi *cfspi = (struct cfspi *)ifc->priv;
+
+	if (!in_interrupt())
+		spin_lock(&cfspi->lock);
+	if (assert) {
+		set_bit(SPI_SS_ON, &cfspi->state);
+		set_bit(SPI_XFER, &cfspi->state);
+	} else {
+		set_bit(SPI_SS_OFF, &cfspi->state);
+	}
+	if (!in_interrupt())
+		spin_unlock(&cfspi->lock);
+
+	/* Wake up the xfer thread. */
+	wake_up_interruptible(&cfspi->wait);
+}
+
+static void cfspi_xfer_done_cb(struct cfspi_ifc *ifc)
+{
+	struct cfspi *cfspi = (struct cfspi *)ifc->priv;
+
+	/* Transfer done, complete work queue */
+	complete(&cfspi->comp);
+}
+
+static int cfspi_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct cfspi *cfspi = NULL;
+	unsigned long flags;
+	if (!dev)
+		return -EINVAL;
+
+	cfspi = netdev_priv(dev);
+
+	skb_queue_tail(&cfspi->qhead, skb);
+
+	spin_lock_irqsave(&cfspi->lock, flags);
+	if (!test_and_set_bit(SPI_XFER, &cfspi->state)) {
+		/* Wake up xfer thread. */
+		wake_up_interruptible(&cfspi->wait);
+	}
+	spin_unlock_irqrestore(&cfspi->lock, flags);
+
+	/* Send flow off if number of bytes is above high water mark */
+	if (!cfspi->flow_off_sent &&
+		cfspi->qhead.qlen > cfspi->qd_high_mark &&
+		cfspi->cfdev.flowctrl) {
+		cfspi->flow_off_sent = 1;
+		cfspi->cfdev.flowctrl(cfspi->ndev, 0);
+	}
+
+	return 0;
+}
+
+int cfspi_rxfrm(struct cfspi *cfspi, u8 *buf, size_t len)
+{
+	u8 *src = buf;
+
+	caif_assert(buf != NULL);
+
+	do {
+		int res;
+		struct sk_buff *skb = NULL;
+		int spad = 0;
+		int epad = 0;
+		u8 *dst = NULL;
+		int pkt_len = 0;
+
+		/*
+		 * Compute head offset i.e. number of bytes added to
+		 * get the start of the payload aligned.
+		 */
+		if (spi_down_head_align) {
+			spad = 1 + *src;
+			src += spad;
+		}
+
+		/* Read length of CAIF frame (little endian). */
+		pkt_len = *src;
+		pkt_len |= ((*(src+1)) << 8) & 0xFF00;
+		pkt_len += 2;	/* Add FCS fields. */
+
+		/* Get a suitable caif packet and copy in data. */
+
+		skb = netdev_alloc_skb(cfspi->ndev, pkt_len + 1);
+		caif_assert(skb != NULL);
+
+		dst = skb_put(skb, pkt_len);
+		memcpy(dst, src, pkt_len);
+		src += pkt_len;
+
+		skb->protocol = htons(ETH_P_CAIF);
+		skb_reset_mac_header(skb);
+		skb->dev = cfspi->ndev;
+
+		/*
+		 * Push received packet up the stack.
+		 */
+		if (!spi_loop)
+			res = netif_rx_ni(skb);
+		else
+			res = cfspi_xmit(skb, cfspi->ndev);
+
+		if (!res) {
+			cfspi->ndev->stats.rx_packets++;
+			cfspi->ndev->stats.rx_bytes += pkt_len;
+		} else
+			cfspi->ndev->stats.rx_dropped++;
+
+		/*
+		 * Compute tail offset i.e. number of bytes added to
+		 * get the complete CAIF frame aligned.
+		 */
+		epad = (pkt_len + spad) & spi_down_tail_align;
+		src += epad;
+	} while ((src - buf) < len);
+
+	return src - buf;
+}
+
+static int cfspi_open(struct net_device *dev)
+{
+	netif_wake_queue(dev);
+	return 0;
+}
+
+static int cfspi_close(struct net_device *dev)
+{
+	netif_stop_queue(dev);
+	return 0;
+}
+static const struct net_device_ops cfspi_ops = {
+	.ndo_open = cfspi_open,
+	.ndo_stop = cfspi_close,
+	.ndo_start_xmit = cfspi_xmit
+};
+
+static void cfspi_setup(struct net_device *dev)
+{
+	struct cfspi *cfspi = netdev_priv(dev);
+	dev->features = 0;
+	dev->netdev_ops = &cfspi_ops;
+	dev->type = ARPHRD_CAIF;
+	dev->flags = IFF_NOARP | IFF_POINTOPOINT;
+	dev->tx_queue_len = 0;
+	dev->mtu = SPI_MAX_PAYLOAD_SIZE;
+	dev->destructor = free_netdev;
+	skb_queue_head_init(&cfspi->qhead);
+	skb_queue_head_init(&cfspi->chead);
+	cfspi->cfdev.link_select = CAIF_LINK_HIGH_BANDW;
+	cfspi->cfdev.use_frag = false;
+	cfspi->cfdev.use_stx = false;
+	cfspi->cfdev.use_fcs = false;
+	cfspi->ndev = dev;
+}
+
+int cfspi_spi_probe(struct platform_device *pdev)
+{
+	struct cfspi *cfspi = NULL;
+	struct net_device *ndev;
+	struct cfspi_dev *dev;
+	int res;
+	dev = (struct cfspi_dev *)pdev->dev.platform_data;
+
+	ndev = alloc_netdev(sizeof(struct cfspi),
+			"cfspi%d", cfspi_setup);
+	if (!dev)
+		return -ENODEV;
+
+	cfspi = netdev_priv(ndev);
+	netif_stop_queue(ndev);
+	cfspi->ndev = ndev;
+	cfspi->pdev = pdev;
+
+	/* Set flow info */
+	cfspi->flow_off_sent = 0;
+	cfspi->qd_low_mark = LOW_WATER_MARK;
+	cfspi->qd_high_mark = HIGH_WATER_MARK;
+
+	/* Assign the SPI device. */
+	cfspi->dev = dev;
+	/* Assign the device ifc to this SPI interface. */
+	dev->ifc = &cfspi->ifc;
+
+	/* Allocate DMA buffers. */
+	cfspi->xfer.va_tx = dma_alloc(&cfspi->xfer.pa_tx);
+	if (!cfspi->xfer.va_tx) {
+		printk(KERN_WARNING
+		       "CFSPI: failed to allocate dma TX buffer.\n");
+		res = -ENODEV;
+		goto err_dma_alloc_tx;
+	}
+
+	cfspi->xfer.va_rx = dma_alloc(&cfspi->xfer.pa_rx);
+
+	if (!cfspi->xfer.va_rx) {
+		printk(KERN_WARNING
+		       "CFSPI: failed to allocate dma TX buffer.\n");
+		res = -ENODEV;
+		goto err_dma_alloc_rx;
+	}
+
+	/* Initialize the work queue. */
+	INIT_WORK(&cfspi->work, cfspi_xfer);
+
+	/* Initialize spin locks. */
+	spin_lock_init(&cfspi->lock);
+
+	/* Initialize flow control state. */
+	cfspi->flow_stop = false;
+
+	/* Initialize wait queue. */
+	init_waitqueue_head(&cfspi->wait);
+
+	/* Create work thread. */
+	cfspi->wq = create_singlethread_workqueue(dev->name);
+	if (!cfspi->wq) {
+		printk(KERN_WARNING "CFSPI: failed to create work queue.\n");
+		res = -ENODEV;
+		goto err_create_wq;
+	}
+
+	/* Initialize work queue. */
+	init_completion(&cfspi->comp);
+
+	/* Create debugfs entries. */
+	dev_debugfs_add(cfspi);
+
+	/* Set up the ifc. */
+	cfspi->ifc.ss_cb = cfspi_ss_cb;
+	cfspi->ifc.xfer_done_cb = cfspi_xfer_done_cb;
+	cfspi->ifc.priv = cfspi;
+
+	/* Add CAIF SPI device to list. */
+	spin_lock(&cfspi_list_lock);
+	list_add_tail(&cfspi->list, &cfspi_list);
+	spin_unlock(&cfspi_list_lock);
+
+	/* Schedule the work queue. */
+	queue_work(cfspi->wq, &cfspi->work);
+
+	/* Register network device. */
+	res = register_netdev(ndev);
+	if (res) {
+		printk(KERN_ERR "CFSPI: Reg. error: %d.\n", res);
+		goto err_net_reg;
+	}
+	return res;
+
+ err_net_reg:
+	dev_debugfs_rem(cfspi);
+	set_bit(SPI_TERMINATE, &cfspi->state);
+	wake_up_interruptible(&cfspi->wait);
+	destroy_workqueue(cfspi->wq);
+ err_create_wq:
+	dma_free(cfspi->xfer.va_rx, cfspi->xfer.pa_rx);
+ err_dma_alloc_rx:
+	dma_free(cfspi->xfer.va_tx, cfspi->xfer.pa_tx);
+ err_dma_alloc_tx:
+	free_netdev(ndev);
+
+	return res;
+}
+
+int cfspi_spi_remove(struct platform_device *pdev)
+{
+	struct list_head *list_node;
+	struct list_head *n;
+	struct cfspi *cfspi = NULL;
+	struct cfspi_dev *dev;
+
+	dev = (struct cfspi_dev *)pdev->dev.platform_data;
+	spin_lock(&cfspi_list_lock);
+	list_for_each_safe(list_node, n, &cfspi_list) {
+		cfspi = list_entry(list_node, struct cfspi, list);
+		/* Find the corresponding device. */
+		if (cfspi->dev == dev) {
+			/* Remove from list. */
+			list_del(list_node);
+			/* Free DMA buffers. */
+			dma_free(cfspi->xfer.va_rx, cfspi->xfer.pa_rx);
+			dma_free(cfspi->xfer.va_tx, cfspi->xfer.pa_tx);
+			set_bit(SPI_TERMINATE, &cfspi->state);
+			wake_up_interruptible(&cfspi->wait);
+			destroy_workqueue(cfspi->wq);
+			/* Destroy debugfs directory and files. */
+			dev_debugfs_rem(cfspi);
+			unregister_netdev(cfspi->ndev);
+			spin_unlock(&cfspi_list_lock);
+			return 0;
+		}
+	}
+	spin_unlock(&cfspi_list_lock);
+	return -ENODEV;
+}
+
+static void __exit cfspi_exit_module(void)
+{
+	struct list_head *list_node;
+	struct list_head *n;
+	struct cfspi *cfspi = NULL;
+
+	list_for_each_safe(list_node, n, &cfspi_list) {
+		cfspi = list_entry(list_node, struct cfspi, list);
+		platform_device_unregister(cfspi->pdev);
+	}
+
+	/* Destroy sysfs files. */
+	driver_remove_file(&cfspi_spi_driver.driver,
+			   &driver_attr_up_head_align);
+	driver_remove_file(&cfspi_spi_driver.driver,
+			   &driver_attr_up_tail_align);
+	driver_remove_file(&cfspi_spi_driver.driver,
+			   &driver_attr_down_head_align);
+	driver_remove_file(&cfspi_spi_driver.driver,
+			   &driver_attr_down_tail_align);
+	driver_remove_file(&cfspi_spi_driver.driver, &driver_attr_frame_align);
+	/* Unregister platform driver. */
+	platform_driver_unregister(&cfspi_spi_driver);
+	/* Destroy debugfs root directory. */
+	driver_debugfs_remove();
+}
+
+static int __init cfspi_init_module(void)
+{
+	int result;
+
+	/* Initialize spin lock. */
+	spin_lock_init(&cfspi_list_lock);
+
+	/* Register platform driver. */
+	result = platform_driver_register(&cfspi_spi_driver);
+	if (result) {
+		printk(KERN_ERR "Could not register platform SPI driver.\n");
+		goto err_dev_register;
+	}
+
+	/* Create sysfs files. */
+	result =
+	    driver_create_file(&cfspi_spi_driver.driver,
+			       &driver_attr_up_head_align);
+	if (result) {
+		printk(KERN_ERR "Sysfs creation failed 1.\n");
+		goto err_create_up_head_align;
+	}
+
+	result =
+	    driver_create_file(&cfspi_spi_driver.driver,
+			       &driver_attr_up_tail_align);
+	if (result) {
+		printk(KERN_ERR "Sysfs creation failed 2.\n");
+		goto err_create_up_tail_align;
+	}
+
+	result =
+	    driver_create_file(&cfspi_spi_driver.driver,
+			       &driver_attr_down_head_align);
+	if (result) {
+		printk(KERN_ERR "Sysfs creation failed 3.\n");
+		goto err_create_down_head_align;
+	}
+
+	result =
+	    driver_create_file(&cfspi_spi_driver.driver,
+			       &driver_attr_down_tail_align);
+	if (result) {
+		printk(KERN_ERR "Sysfs creation failed 4.\n");
+		goto err_create_down_tail_align;
+	}
+
+	result =
+	    driver_create_file(&cfspi_spi_driver.driver,
+			       &driver_attr_frame_align);
+	if (result) {
+		printk(KERN_ERR "Sysfs creation failed 5.\n");
+		goto err_create_frame_align;
+	}
+	driver_debugfs_create();
+	return result;
+
+ err_create_frame_align:
+	driver_remove_file(&cfspi_spi_driver.driver,
+			   &driver_attr_down_tail_align);
+ err_create_down_tail_align:
+	driver_remove_file(&cfspi_spi_driver.driver,
+			   &driver_attr_down_head_align);
+ err_create_down_head_align:
+	driver_remove_file(&cfspi_spi_driver.driver,
+			   &driver_attr_up_tail_align);
+ err_create_up_tail_align:
+	driver_remove_file(&cfspi_spi_driver.driver,
+			   &driver_attr_up_head_align);
+ err_create_up_head_align:
+ err_dev_register:
+	return result;
+}
+
+module_init(cfspi_init_module);
+module_exit(cfspi_exit_module);