davinci*/tlan/cpmac: Move the Texas Instruments (TI) drivers

Move the Texas Instruments drivers to drivers/net/ethernet/ti/ and
make the necessary Kconfig and Makefile changes.

CC: Sriram <srk@ti.com>
CC: Vinay Hegde <vinay.hegde@ti.com>
CC: Cyril Chemparathy <cyril@ti.com>
CC: Samuel Chessman <chessman@tux.org>
CC: <torben.mathiasen@compaq.com>
CC: Eugene Konev <ejka@imfi.kspu.ru>
CC: Florian Fainelli <florian@openwrt.org>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 0 insertions, 970 deletions

diff --git a/drivers/net/davinci_cpdma.c b/drivers/net/davinci_cpdma.c
deleted file mode 100644
index dca9d3369cd..00000000000
--- a/drivers/net/davinci_cpdma.c
+++ /dev/null
@@ -1,970 +0,0 @@
-/*
- * Texas Instruments CPDMA Driver
- *
- * Copyright (C) 2010 Texas Instruments
- *
- * 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.
- *
- * This program is distributed "as is" WITHOUT ANY WARRANTY of any
- * kind, whether express or implied; without even the implied warranty
- * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- */
-#include <linux/kernel.h>
-#include <linux/spinlock.h>
-#include <linux/device.h>
-#include <linux/slab.h>
-#include <linux/err.h>
-#include <linux/dma-mapping.h>
-#include <linux/io.h>
-
-#include "davinci_cpdma.h"
-
-/* DMA Registers */
-#define CPDMA_TXIDVER		0x00
-#define CPDMA_TXCONTROL		0x04
-#define CPDMA_TXTEARDOWN	0x08
-#define CPDMA_RXIDVER		0x10
-#define CPDMA_RXCONTROL		0x14
-#define CPDMA_SOFTRESET		0x1c
-#define CPDMA_RXTEARDOWN	0x18
-#define CPDMA_TXINTSTATRAW	0x80
-#define CPDMA_TXINTSTATMASKED	0x84
-#define CPDMA_TXINTMASKSET	0x88
-#define CPDMA_TXINTMASKCLEAR	0x8c
-#define CPDMA_MACINVECTOR	0x90
-#define CPDMA_MACEOIVECTOR	0x94
-#define CPDMA_RXINTSTATRAW	0xa0
-#define CPDMA_RXINTSTATMASKED	0xa4
-#define CPDMA_RXINTMASKSET	0xa8
-#define CPDMA_RXINTMASKCLEAR	0xac
-#define CPDMA_DMAINTSTATRAW	0xb0
-#define CPDMA_DMAINTSTATMASKED	0xb4
-#define CPDMA_DMAINTMASKSET	0xb8
-#define CPDMA_DMAINTMASKCLEAR	0xbc
-#define CPDMA_DMAINT_HOSTERR	BIT(1)
-
-/* the following exist only if has_ext_regs is set */
-#define CPDMA_DMACONTROL	0x20
-#define CPDMA_DMASTATUS		0x24
-#define CPDMA_RXBUFFOFS		0x28
-#define CPDMA_EM_CONTROL	0x2c
-
-/* Descriptor mode bits */
-#define CPDMA_DESC_SOP		BIT(31)
-#define CPDMA_DESC_EOP		BIT(30)
-#define CPDMA_DESC_OWNER	BIT(29)
-#define CPDMA_DESC_EOQ		BIT(28)
-#define CPDMA_DESC_TD_COMPLETE	BIT(27)
-#define CPDMA_DESC_PASS_CRC	BIT(26)
-
-#define CPDMA_TEARDOWN_VALUE	0xfffffffc
-
-struct cpdma_desc {
-	/* hardware fields */
-	u32			hw_next;
-	u32			hw_buffer;
-	u32			hw_len;
-	u32			hw_mode;
-	/* software fields */
-	void			*sw_token;
-	u32			sw_buffer;
-	u32			sw_len;
-};
-
-struct cpdma_desc_pool {
-	u32			phys;
-	u32			hw_addr;
-	void __iomem		*iomap;		/* ioremap map */
-	void			*cpumap;	/* dma_alloc map */
-	int			desc_size, mem_size;
-	int			num_desc, used_desc;
-	unsigned long		*bitmap;
-	struct device		*dev;
-	spinlock_t		lock;
-};
-
-enum cpdma_state {
-	CPDMA_STATE_IDLE,
-	CPDMA_STATE_ACTIVE,
-	CPDMA_STATE_TEARDOWN,
-};
-
-const char *cpdma_state_str[] = { "idle", "active", "teardown" };
-
-struct cpdma_ctlr {
-	enum cpdma_state	state;
-	struct cpdma_params	params;
-	struct device		*dev;
-	struct cpdma_desc_pool	*pool;
-	spinlock_t		lock;
-	struct cpdma_chan	*channels[2 * CPDMA_MAX_CHANNELS];
-};
-
-struct cpdma_chan {
-	enum cpdma_state		state;
-	struct cpdma_ctlr		*ctlr;
-	int				chan_num;
-	spinlock_t			lock;
-	struct cpdma_desc __iomem	*head, *tail;
-	int				count;
-	void __iomem			*hdp, *cp, *rxfree;
-	u32				mask;
-	cpdma_handler_fn		handler;
-	enum dma_data_direction		dir;
-	struct cpdma_chan_stats		stats;
-	/* offsets into dmaregs */
-	int	int_set, int_clear, td;
-};
-
-/* The following make access to common cpdma_ctlr params more readable */
-#define dmaregs		params.dmaregs
-#define num_chan	params.num_chan
-
-/* various accessors */
-#define dma_reg_read(ctlr, ofs)		__raw_readl((ctlr)->dmaregs + (ofs))
-#define chan_read(chan, fld)		__raw_readl((chan)->fld)
-#define desc_read(desc, fld)		__raw_readl(&(desc)->fld)
-#define dma_reg_write(ctlr, ofs, v)	__raw_writel(v, (ctlr)->dmaregs + (ofs))
-#define chan_write(chan, fld, v)	__raw_writel(v, (chan)->fld)
-#define desc_write(desc, fld, v)	__raw_writel((u32)(v), &(desc)->fld)
-
-/*
- * Utility constructs for a cpdma descriptor pool.  Some devices (e.g. davinci
- * emac) have dedicated on-chip memory for these descriptors.  Some other
- * devices (e.g. cpsw switches) use plain old memory.  Descriptor pools
- * abstract out these details
- */
-static struct cpdma_desc_pool *
-cpdma_desc_pool_create(struct device *dev, u32 phys, u32 hw_addr,
-				int size, int align)
-{
-	int bitmap_size;
-	struct cpdma_desc_pool *pool;
-
-	pool = kzalloc(sizeof(*pool), GFP_KERNEL);
-	if (!pool)
-		return NULL;
-
-	spin_lock_init(&pool->lock);
-
-	pool->dev	= dev;
-	pool->mem_size	= size;
-	pool->desc_size	= ALIGN(sizeof(struct cpdma_desc), align);
-	pool->num_desc	= size / pool->desc_size;
-
-	bitmap_size  = (pool->num_desc / BITS_PER_LONG) * sizeof(long);
-	pool->bitmap = kzalloc(bitmap_size, GFP_KERNEL);
-	if (!pool->bitmap)
-		goto fail;
-
-	if (phys) {
-		pool->phys  = phys;
-		pool->iomap = ioremap(phys, size);
-		pool->hw_addr = hw_addr;
-	} else {
-		pool->cpumap = dma_alloc_coherent(dev, size, &pool->phys,
-						  GFP_KERNEL);
-		pool->iomap = pool->cpumap;
-		pool->hw_addr = pool->phys;
-	}
-
-	if (pool->iomap)
-		return pool;
-
-fail:
-	kfree(pool->bitmap);
-	kfree(pool);
-	return NULL;
-}
-
-static void cpdma_desc_pool_destroy(struct cpdma_desc_pool *pool)
-{
-	unsigned long flags;
-
-	if (!pool)
-		return;
-
-	spin_lock_irqsave(&pool->lock, flags);
-	WARN_ON(pool->used_desc);
-	kfree(pool->bitmap);
-	if (pool->cpumap) {
-		dma_free_coherent(pool->dev, pool->mem_size, pool->cpumap,
-				  pool->phys);
-	} else {
-		iounmap(pool->iomap);
-	}
-	spin_unlock_irqrestore(&pool->lock, flags);
-	kfree(pool);
-}
-
-static inline dma_addr_t desc_phys(struct cpdma_desc_pool *pool,
-		  struct cpdma_desc __iomem *desc)
-{
-	if (!desc)
-		return 0;
-	return pool->hw_addr + (__force dma_addr_t)desc -
-			    (__force dma_addr_t)pool->iomap;
-}
-
-static inline struct cpdma_desc __iomem *
-desc_from_phys(struct cpdma_desc_pool *pool, dma_addr_t dma)
-{
-	return dma ? pool->iomap + dma - pool->hw_addr : NULL;
-}
-
-static struct cpdma_desc __iomem *
-cpdma_desc_alloc(struct cpdma_desc_pool *pool, int num_desc)
-{
-	unsigned long flags;
-	int index;
-	struct cpdma_desc __iomem *desc = NULL;
-
-	spin_lock_irqsave(&pool->lock, flags);
-
-	index = bitmap_find_next_zero_area(pool->bitmap, pool->num_desc, 0,
-					   num_desc, 0);
-	if (index < pool->num_desc) {
-		bitmap_set(pool->bitmap, index, num_desc);
-		desc = pool->iomap + pool->desc_size * index;
-		pool->used_desc++;
-	}
-
-	spin_unlock_irqrestore(&pool->lock, flags);
-	return desc;
-}
-
-static void cpdma_desc_free(struct cpdma_desc_pool *pool,
-			    struct cpdma_desc __iomem *desc, int num_desc)
-{
-	unsigned long flags, index;
-
-	index = ((unsigned long)desc - (unsigned long)pool->iomap) /
-		pool->desc_size;
-	spin_lock_irqsave(&pool->lock, flags);
-	bitmap_clear(pool->bitmap, index, num_desc);
-	pool->used_desc--;
-	spin_unlock_irqrestore(&pool->lock, flags);
-}
-
-struct cpdma_ctlr *cpdma_ctlr_create(struct cpdma_params *params)
-{
-	struct cpdma_ctlr *ctlr;
-
-	ctlr = kzalloc(sizeof(*ctlr), GFP_KERNEL);
-	if (!ctlr)
-		return NULL;
-
-	ctlr->state = CPDMA_STATE_IDLE;
-	ctlr->params = *params;
-	ctlr->dev = params->dev;
-	spin_lock_init(&ctlr->lock);
-
-	ctlr->pool = cpdma_desc_pool_create(ctlr->dev,
-					    ctlr->params.desc_mem_phys,
-					    ctlr->params.desc_hw_addr,
-					    ctlr->params.desc_mem_size,
-					    ctlr->params.desc_align);
-	if (!ctlr->pool) {
-		kfree(ctlr);
-		return NULL;
-	}
-
-	if (WARN_ON(ctlr->num_chan > CPDMA_MAX_CHANNELS))
-		ctlr->num_chan = CPDMA_MAX_CHANNELS;
-	return ctlr;
-}
-
-int cpdma_ctlr_start(struct cpdma_ctlr *ctlr)
-{
-	unsigned long flags;
-	int i;
-
-	spin_lock_irqsave(&ctlr->lock, flags);
-	if (ctlr->state != CPDMA_STATE_IDLE) {
-		spin_unlock_irqrestore(&ctlr->lock, flags);
-		return -EBUSY;
-	}
-
-	if (ctlr->params.has_soft_reset) {
-		unsigned long timeout = jiffies + HZ/10;
-
-		dma_reg_write(ctlr, CPDMA_SOFTRESET, 1);
-		while (time_before(jiffies, timeout)) {
-			if (dma_reg_read(ctlr, CPDMA_SOFTRESET) == 0)
-				break;
-		}
-		WARN_ON(!time_before(jiffies, timeout));
-	}
-
-	for (i = 0; i < ctlr->num_chan; i++) {
-		__raw_writel(0, ctlr->params.txhdp + 4 * i);
-		__raw_writel(0, ctlr->params.rxhdp + 4 * i);
-		__raw_writel(0, ctlr->params.txcp + 4 * i);
-		__raw_writel(0, ctlr->params.rxcp + 4 * i);
-	}
-
-	dma_reg_write(ctlr, CPDMA_RXINTMASKCLEAR, 0xffffffff);
-	dma_reg_write(ctlr, CPDMA_TXINTMASKCLEAR, 0xffffffff);
-
-	dma_reg_write(ctlr, CPDMA_TXCONTROL, 1);
-	dma_reg_write(ctlr, CPDMA_RXCONTROL, 1);
-
-	ctlr->state = CPDMA_STATE_ACTIVE;
-
-	for (i = 0; i < ARRAY_SIZE(ctlr->channels); i++) {
-		if (ctlr->channels[i])
-			cpdma_chan_start(ctlr->channels[i]);
-	}
-	spin_unlock_irqrestore(&ctlr->lock, flags);
-	return 0;
-}
-
-int cpdma_ctlr_stop(struct cpdma_ctlr *ctlr)
-{
-	unsigned long flags;
-	int i;
-
-	spin_lock_irqsave(&ctlr->lock, flags);
-	if (ctlr->state != CPDMA_STATE_ACTIVE) {
-		spin_unlock_irqrestore(&ctlr->lock, flags);
-		return -EINVAL;
-	}
-
-	ctlr->state = CPDMA_STATE_TEARDOWN;
-
-	for (i = 0; i < ARRAY_SIZE(ctlr->channels); i++) {
-		if (ctlr->channels[i])
-			cpdma_chan_stop(ctlr->channels[i]);
-	}
-
-	dma_reg_write(ctlr, CPDMA_RXINTMASKCLEAR, 0xffffffff);
-	dma_reg_write(ctlr, CPDMA_TXINTMASKCLEAR, 0xffffffff);
-
-	dma_reg_write(ctlr, CPDMA_TXCONTROL, 0);
-	dma_reg_write(ctlr, CPDMA_RXCONTROL, 0);
-
-	ctlr->state = CPDMA_STATE_IDLE;
-
-	spin_unlock_irqrestore(&ctlr->lock, flags);
-	return 0;
-}
-
-int cpdma_ctlr_dump(struct cpdma_ctlr *ctlr)
-{
-	struct device *dev = ctlr->dev;
-	unsigned long flags;
-	int i;
-
-	spin_lock_irqsave(&ctlr->lock, flags);
-
-	dev_info(dev, "CPDMA: state: %s", cpdma_state_str[ctlr->state]);
-
-	dev_info(dev, "CPDMA: txidver: %x",
-		 dma_reg_read(ctlr, CPDMA_TXIDVER));
-	dev_info(dev, "CPDMA: txcontrol: %x",
-		 dma_reg_read(ctlr, CPDMA_TXCONTROL));
-	dev_info(dev, "CPDMA: txteardown: %x",
-		 dma_reg_read(ctlr, CPDMA_TXTEARDOWN));
-	dev_info(dev, "CPDMA: rxidver: %x",
-		 dma_reg_read(ctlr, CPDMA_RXIDVER));
-	dev_info(dev, "CPDMA: rxcontrol: %x",
-		 dma_reg_read(ctlr, CPDMA_RXCONTROL));
-	dev_info(dev, "CPDMA: softreset: %x",
-		 dma_reg_read(ctlr, CPDMA_SOFTRESET));
-	dev_info(dev, "CPDMA: rxteardown: %x",
-		 dma_reg_read(ctlr, CPDMA_RXTEARDOWN));
-	dev_info(dev, "CPDMA: txintstatraw: %x",
-		 dma_reg_read(ctlr, CPDMA_TXINTSTATRAW));
-	dev_info(dev, "CPDMA: txintstatmasked: %x",
-		 dma_reg_read(ctlr, CPDMA_TXINTSTATMASKED));
-	dev_info(dev, "CPDMA: txintmaskset: %x",
-		 dma_reg_read(ctlr, CPDMA_TXINTMASKSET));
-	dev_info(dev, "CPDMA: txintmaskclear: %x",
-		 dma_reg_read(ctlr, CPDMA_TXINTMASKCLEAR));
-	dev_info(dev, "CPDMA: macinvector: %x",
-		 dma_reg_read(ctlr, CPDMA_MACINVECTOR));
-	dev_info(dev, "CPDMA: maceoivector: %x",
-		 dma_reg_read(ctlr, CPDMA_MACEOIVECTOR));
-	dev_info(dev, "CPDMA: rxintstatraw: %x",
-		 dma_reg_read(ctlr, CPDMA_RXINTSTATRAW));
-	dev_info(dev, "CPDMA: rxintstatmasked: %x",
-		 dma_reg_read(ctlr, CPDMA_RXINTSTATMASKED));
-	dev_info(dev, "CPDMA: rxintmaskset: %x",
-		 dma_reg_read(ctlr, CPDMA_RXINTMASKSET));
-	dev_info(dev, "CPDMA: rxintmaskclear: %x",
-		 dma_reg_read(ctlr, CPDMA_RXINTMASKCLEAR));
-	dev_info(dev, "CPDMA: dmaintstatraw: %x",
-		 dma_reg_read(ctlr, CPDMA_DMAINTSTATRAW));
-	dev_info(dev, "CPDMA: dmaintstatmasked: %x",
-		 dma_reg_read(ctlr, CPDMA_DMAINTSTATMASKED));
-	dev_info(dev, "CPDMA: dmaintmaskset: %x",
-		 dma_reg_read(ctlr, CPDMA_DMAINTMASKSET));
-	dev_info(dev, "CPDMA: dmaintmaskclear: %x",
-		 dma_reg_read(ctlr, CPDMA_DMAINTMASKCLEAR));
-
-	if (!ctlr->params.has_ext_regs) {
-		dev_info(dev, "CPDMA: dmacontrol: %x",
-			 dma_reg_read(ctlr, CPDMA_DMACONTROL));
-		dev_info(dev, "CPDMA: dmastatus: %x",
-			 dma_reg_read(ctlr, CPDMA_DMASTATUS));
-		dev_info(dev, "CPDMA: rxbuffofs: %x",
-			 dma_reg_read(ctlr, CPDMA_RXBUFFOFS));
-	}
-
-	for (i = 0; i < ARRAY_SIZE(ctlr->channels); i++)
-		if (ctlr->channels[i])
-			cpdma_chan_dump(ctlr->channels[i]);
-
-	spin_unlock_irqrestore(&ctlr->lock, flags);
-	return 0;
-}
-
-int cpdma_ctlr_destroy(struct cpdma_ctlr *ctlr)
-{
-	unsigned long flags;
-	int ret = 0, i;
-
-	if (!ctlr)
-		return -EINVAL;
-
-	spin_lock_irqsave(&ctlr->lock, flags);
-	if (ctlr->state != CPDMA_STATE_IDLE)
-		cpdma_ctlr_stop(ctlr);
-
-	for (i = 0; i < ARRAY_SIZE(ctlr->channels); i++) {
-		if (ctlr->channels[i])
-			cpdma_chan_destroy(ctlr->channels[i]);
-	}
-
-	cpdma_desc_pool_destroy(ctlr->pool);
-	spin_unlock_irqrestore(&ctlr->lock, flags);
-	kfree(ctlr);
-	return ret;
-}
-
-int cpdma_ctlr_int_ctrl(struct cpdma_ctlr *ctlr, bool enable)
-{
-	unsigned long flags;
-	int i, reg;
-
-	spin_lock_irqsave(&ctlr->lock, flags);
-	if (ctlr->state != CPDMA_STATE_ACTIVE) {
-		spin_unlock_irqrestore(&ctlr->lock, flags);
-		return -EINVAL;
-	}
-
-	reg = enable ? CPDMA_DMAINTMASKSET : CPDMA_DMAINTMASKCLEAR;
-	dma_reg_write(ctlr, reg, CPDMA_DMAINT_HOSTERR);
-
-	for (i = 0; i < ARRAY_SIZE(ctlr->channels); i++) {
-		if (ctlr->channels[i])
-			cpdma_chan_int_ctrl(ctlr->channels[i], enable);
-	}
-
-	spin_unlock_irqrestore(&ctlr->lock, flags);
-	return 0;
-}
-
-void cpdma_ctlr_eoi(struct cpdma_ctlr *ctlr)
-{
-	dma_reg_write(ctlr, CPDMA_MACEOIVECTOR, 0);
-}
-
-struct cpdma_chan *cpdma_chan_create(struct cpdma_ctlr *ctlr, int chan_num,
-				     cpdma_handler_fn handler)
-{
-	struct cpdma_chan *chan;
-	int ret, offset = (chan_num % CPDMA_MAX_CHANNELS) * 4;
-	unsigned long flags;
-
-	if (__chan_linear(chan_num) >= ctlr->num_chan)
-		return NULL;
-
-	ret = -ENOMEM;
-	chan = kzalloc(sizeof(*chan), GFP_KERNEL);
-	if (!chan)
-		goto err_chan_alloc;
-
-	spin_lock_irqsave(&ctlr->lock, flags);
-	ret = -EBUSY;
-	if (ctlr->channels[chan_num])
-		goto err_chan_busy;
-
-	chan->ctlr	= ctlr;
-	chan->state	= CPDMA_STATE_IDLE;
-	chan->chan_num	= chan_num;
-	chan->handler	= handler;
-
-	if (is_rx_chan(chan)) {
-		chan->hdp	= ctlr->params.rxhdp + offset;
-		chan->cp	= ctlr->params.rxcp + offset;
-		chan->rxfree	= ctlr->params.rxfree + offset;
-		chan->int_set	= CPDMA_RXINTMASKSET;
-		chan->int_clear	= CPDMA_RXINTMASKCLEAR;
-		chan->td	= CPDMA_RXTEARDOWN;
-		chan->dir	= DMA_FROM_DEVICE;
-	} else {
-		chan->hdp	= ctlr->params.txhdp + offset;
-		chan->cp	= ctlr->params.txcp + offset;
-		chan->int_set	= CPDMA_TXINTMASKSET;
-		chan->int_clear	= CPDMA_TXINTMASKCLEAR;
-		chan->td	= CPDMA_TXTEARDOWN;
-		chan->dir	= DMA_TO_DEVICE;
-	}
-	chan->mask = BIT(chan_linear(chan));
-
-	spin_lock_init(&chan->lock);
-
-	ctlr->channels[chan_num] = chan;
-	spin_unlock_irqrestore(&ctlr->lock, flags);
-	return chan;
-
-err_chan_busy:
-	spin_unlock_irqrestore(&ctlr->lock, flags);
-	kfree(chan);
-err_chan_alloc:
-	return ERR_PTR(ret);
-}
-
-int cpdma_chan_destroy(struct cpdma_chan *chan)
-{
-	struct cpdma_ctlr *ctlr = chan->ctlr;
-	unsigned long flags;
-
-	if (!chan)
-		return -EINVAL;
-
-	spin_lock_irqsave(&ctlr->lock, flags);
-	if (chan->state != CPDMA_STATE_IDLE)
-		cpdma_chan_stop(chan);
-	ctlr->channels[chan->chan_num] = NULL;
-	spin_unlock_irqrestore(&ctlr->lock, flags);
-	kfree(chan);
-	return 0;
-}
-
-int cpdma_chan_get_stats(struct cpdma_chan *chan,
-			 struct cpdma_chan_stats *stats)
-{
-	unsigned long flags;
-	if (!chan)
-		return -EINVAL;
-	spin_lock_irqsave(&chan->lock, flags);
-	memcpy(stats, &chan->stats, sizeof(*stats));
-	spin_unlock_irqrestore(&chan->lock, flags);
-	return 0;
-}
-
-int cpdma_chan_dump(struct cpdma_chan *chan)
-{
-	unsigned long flags;
-	struct device *dev = chan->ctlr->dev;
-
-	spin_lock_irqsave(&chan->lock, flags);
-
-	dev_info(dev, "channel %d (%s %d) state %s",
-		 chan->chan_num, is_rx_chan(chan) ? "rx" : "tx",
-		 chan_linear(chan), cpdma_state_str[chan->state]);
-	dev_info(dev, "\thdp: %x\n", chan_read(chan, hdp));
-	dev_info(dev, "\tcp: %x\n", chan_read(chan, cp));
-	if (chan->rxfree) {
-		dev_info(dev, "\trxfree: %x\n",
-			 chan_read(chan, rxfree));
-	}
-
-	dev_info(dev, "\tstats head_enqueue: %d\n",
-		 chan->stats.head_enqueue);
-	dev_info(dev, "\tstats tail_enqueue: %d\n",
-		 chan->stats.tail_enqueue);
-	dev_info(dev, "\tstats pad_enqueue: %d\n",
-		 chan->stats.pad_enqueue);
-	dev_info(dev, "\tstats misqueued: %d\n",
-		 chan->stats.misqueued);
-	dev_info(dev, "\tstats desc_alloc_fail: %d\n",
-		 chan->stats.desc_alloc_fail);
-	dev_info(dev, "\tstats pad_alloc_fail: %d\n",
-		 chan->stats.pad_alloc_fail);
-	dev_info(dev, "\tstats runt_receive_buff: %d\n",
-		 chan->stats.runt_receive_buff);
-	dev_info(dev, "\tstats runt_transmit_buff: %d\n",
-		 chan->stats.runt_transmit_buff);
-	dev_info(dev, "\tstats empty_dequeue: %d\n",
-		 chan->stats.empty_dequeue);
-	dev_info(dev, "\tstats busy_dequeue: %d\n",
-		 chan->stats.busy_dequeue);
-	dev_info(dev, "\tstats good_dequeue: %d\n",
-		 chan->stats.good_dequeue);
-	dev_info(dev, "\tstats requeue: %d\n",
-		 chan->stats.requeue);
-	dev_info(dev, "\tstats teardown_dequeue: %d\n",
-		 chan->stats.teardown_dequeue);
-
-	spin_unlock_irqrestore(&chan->lock, flags);
-	return 0;
-}
-
-static void __cpdma_chan_submit(struct cpdma_chan *chan,
-				struct cpdma_desc __iomem *desc)
-{
-	struct cpdma_ctlr		*ctlr = chan->ctlr;
-	struct cpdma_desc __iomem	*prev = chan->tail;
-	struct cpdma_desc_pool		*pool = ctlr->pool;
-	dma_addr_t			desc_dma;
-	u32				mode;
-
-	desc_dma = desc_phys(pool, desc);
-
-	/* simple case - idle channel */
-	if (!chan->head) {
-		chan->stats.head_enqueue++;
-		chan->head = desc;
-		chan->tail = desc;
-		if (chan->state == CPDMA_STATE_ACTIVE)
-			chan_write(chan, hdp, desc_dma);
-		return;
-	}
-
-	/* first chain the descriptor at the tail of the list */
-	desc_write(prev, hw_next, desc_dma);
-	chan->tail = desc;
-	chan->stats.tail_enqueue++;
-
-	/* next check if EOQ has been triggered already */
-	mode = desc_read(prev, hw_mode);
-	if (((mode & (CPDMA_DESC_EOQ | CPDMA_DESC_OWNER)) == CPDMA_DESC_EOQ) &&
-	    (chan->state == CPDMA_STATE_ACTIVE)) {
-		desc_write(prev, hw_mode, mode & ~CPDMA_DESC_EOQ);
-		chan_write(chan, hdp, desc_dma);
-		chan->stats.misqueued++;
-	}
-}
-
-int cpdma_chan_submit(struct cpdma_chan *chan, void *token, void *data,
-		      int len, gfp_t gfp_mask)
-{
-	struct cpdma_ctlr		*ctlr = chan->ctlr;
-	struct cpdma_desc __iomem	*desc;
-	dma_addr_t			buffer;
-	unsigned long			flags;
-	u32				mode;
-	int				ret = 0;
-
-	spin_lock_irqsave(&chan->lock, flags);
-
-	if (chan->state == CPDMA_STATE_TEARDOWN) {
-		ret = -EINVAL;
-		goto unlock_ret;
-	}
-
-	desc = cpdma_desc_alloc(ctlr->pool, 1);
-	if (!desc) {
-		chan->stats.desc_alloc_fail++;
-		ret = -ENOMEM;
-		goto unlock_ret;
-	}
-
-	if (len < ctlr->params.min_packet_size) {
-		len = ctlr->params.min_packet_size;
-		chan->stats.runt_transmit_buff++;
-	}
-
-	buffer = dma_map_single(ctlr->dev, data, len, chan->dir);
-	mode = CPDMA_DESC_OWNER | CPDMA_DESC_SOP | CPDMA_DESC_EOP;
-
-	desc_write(desc, hw_next,   0);
-	desc_write(desc, hw_buffer, buffer);
-	desc_write(desc, hw_len,    len);
-	desc_write(desc, hw_mode,   mode | len);
-	desc_write(desc, sw_token,  token);
-	desc_write(desc, sw_buffer, buffer);
-	desc_write(desc, sw_len,    len);
-
-	__cpdma_chan_submit(chan, desc);
-
-	if (chan->state == CPDMA_STATE_ACTIVE && chan->rxfree)
-		chan_write(chan, rxfree, 1);
-
-	chan->count++;
-
-unlock_ret:
-	spin_unlock_irqrestore(&chan->lock, flags);
-	return ret;
-}
-
-static void __cpdma_chan_free(struct cpdma_chan *chan,
-			      struct cpdma_desc __iomem *desc,
-			      int outlen, int status)
-{
-	struct cpdma_ctlr		*ctlr = chan->ctlr;
-	struct cpdma_desc_pool		*pool = ctlr->pool;
-	dma_addr_t			buff_dma;
-	int				origlen;
-	void				*token;
-
-	token      = (void *)desc_read(desc, sw_token);
-	buff_dma   = desc_read(desc, sw_buffer);
-	origlen    = desc_read(desc, sw_len);
-
-	dma_unmap_single(ctlr->dev, buff_dma, origlen, chan->dir);
-	cpdma_desc_free(pool, desc, 1);
-	(*chan->handler)(token, outlen, status);
-}
-
-static int __cpdma_chan_process(struct cpdma_chan *chan)
-{
-	struct cpdma_ctlr		*ctlr = chan->ctlr;
-	struct cpdma_desc __iomem	*desc;
-	int				status, outlen;
-	struct cpdma_desc_pool		*pool = ctlr->pool;
-	dma_addr_t			desc_dma;
-	unsigned long			flags;
-
-	spin_lock_irqsave(&chan->lock, flags);
-
-	desc = chan->head;
-	if (!desc) {
-		chan->stats.empty_dequeue++;
-		status = -ENOENT;
-		goto unlock_ret;
-	}
-	desc_dma = desc_phys(pool, desc);
-
-	status	= __raw_readl(&desc->hw_mode);
-	outlen	= status & 0x7ff;
-	if (status & CPDMA_DESC_OWNER) {
-		chan->stats.busy_dequeue++;
-		status = -EBUSY;
-		goto unlock_ret;
-	}
-	status	= status & (CPDMA_DESC_EOQ | CPDMA_DESC_TD_COMPLETE);
-
-	chan->head = desc_from_phys(pool, desc_read(desc, hw_next));
-	chan_write(chan, cp, desc_dma);
-	chan->count--;
-	chan->stats.good_dequeue++;
-
-	if (status & CPDMA_DESC_EOQ) {
-		chan->stats.requeue++;
-		chan_write(chan, hdp, desc_phys(pool, chan->head));
-	}
-
-	spin_unlock_irqrestore(&chan->lock, flags);
-
-	__cpdma_chan_free(chan, desc, outlen, status);
-	return status;
-
-unlock_ret:
-	spin_unlock_irqrestore(&chan->lock, flags);
-	return status;
-}
-
-int cpdma_chan_process(struct cpdma_chan *chan, int quota)
-{
-	int used = 0, ret = 0;
-
-	if (chan->state != CPDMA_STATE_ACTIVE)
-		return -EINVAL;
-
-	while (used < quota) {
-		ret = __cpdma_chan_process(chan);
-		if (ret < 0)
-			break;
-		used++;
-	}
-	return used;
-}
-
-int cpdma_chan_start(struct cpdma_chan *chan)
-{
-	struct cpdma_ctlr	*ctlr = chan->ctlr;
-	struct cpdma_desc_pool	*pool = ctlr->pool;
-	unsigned long		flags;
-
-	spin_lock_irqsave(&chan->lock, flags);
-	if (chan->state != CPDMA_STATE_IDLE) {
-		spin_unlock_irqrestore(&chan->lock, flags);
-		return -EBUSY;
-	}
-	if (ctlr->state != CPDMA_STATE_ACTIVE) {
-		spin_unlock_irqrestore(&chan->lock, flags);
-		return -EINVAL;
-	}
-	dma_reg_write(ctlr, chan->int_set, chan->mask);
-	chan->state = CPDMA_STATE_ACTIVE;
-	if (chan->head) {
-		chan_write(chan, hdp, desc_phys(pool, chan->head));
-		if (chan->rxfree)
-			chan_write(chan, rxfree, chan->count);
-	}
-
-	spin_unlock_irqrestore(&chan->lock, flags);
-	return 0;
-}
-
-int cpdma_chan_stop(struct cpdma_chan *chan)
-{
-	struct cpdma_ctlr	*ctlr = chan->ctlr;
-	struct cpdma_desc_pool	*pool = ctlr->pool;
-	unsigned long		flags;
-	int			ret;
-	unsigned long		timeout;
-
-	spin_lock_irqsave(&chan->lock, flags);
-	if (chan->state != CPDMA_STATE_ACTIVE) {
-		spin_unlock_irqrestore(&chan->lock, flags);
-		return -EINVAL;
-	}
-
-	chan->state = CPDMA_STATE_TEARDOWN;
-	dma_reg_write(ctlr, chan->int_clear, chan->mask);
-
-	/* trigger teardown */
-	dma_reg_write(ctlr, chan->td, chan->chan_num);
-
-	/* wait for teardown complete */
-	timeout = jiffies + HZ/10;	/* 100 msec */
-	while (time_before(jiffies, timeout)) {
-		u32 cp = chan_read(chan, cp);
-		if ((cp & CPDMA_TEARDOWN_VALUE) == CPDMA_TEARDOWN_VALUE)
-			break;
-		cpu_relax();
-	}
-	WARN_ON(!time_before(jiffies, timeout));
-	chan_write(chan, cp, CPDMA_TEARDOWN_VALUE);
-
-	/* handle completed packets */
-	do {
-		ret = __cpdma_chan_process(chan);
-		if (ret < 0)
-			break;
-	} while ((ret & CPDMA_DESC_TD_COMPLETE) == 0);
-
-	/* remaining packets haven't been tx/rx'ed, clean them up */
-	while (chan->head) {
-		struct cpdma_desc __iomem *desc = chan->head;
-		dma_addr_t next_dma;
-
-		next_dma = desc_read(desc, hw_next);
-		chan->head = desc_from_phys(pool, next_dma);
-		chan->stats.teardown_dequeue++;
-
-		/* issue callback without locks held */
-		spin_unlock_irqrestore(&chan->lock, flags);
-		__cpdma_chan_free(chan, desc, 0, -ENOSYS);
-		spin_lock_irqsave(&chan->lock, flags);
-	}
-
-	chan->state = CPDMA_STATE_IDLE;
-	spin_unlock_irqrestore(&chan->lock, flags);
-	return 0;
-}
-
-int cpdma_chan_int_ctrl(struct cpdma_chan *chan, bool enable)
-{
-	unsigned long flags;
-
-	spin_lock_irqsave(&chan->lock, flags);
-	if (chan->state != CPDMA_STATE_ACTIVE) {
-		spin_unlock_irqrestore(&chan->lock, flags);
-		return -EINVAL;
-	}
-
-	dma_reg_write(chan->ctlr, enable ? chan->int_set : chan->int_clear,
-		      chan->mask);
-	spin_unlock_irqrestore(&chan->lock, flags);
-
-	return 0;
-}
-
-struct cpdma_control_info {
-	u32		reg;
-	u32		shift, mask;
-	int		access;
-#define ACCESS_RO	BIT(0)
-#define ACCESS_WO	BIT(1)
-#define ACCESS_RW	(ACCESS_RO | ACCESS_WO)
-};
-
-struct cpdma_control_info controls[] = {
-	[CPDMA_CMD_IDLE]	  = {CPDMA_DMACONTROL,	3,  1,      ACCESS_WO},
-	[CPDMA_COPY_ERROR_FRAMES] = {CPDMA_DMACONTROL,	4,  1,      ACCESS_RW},
-	[CPDMA_RX_OFF_LEN_UPDATE] = {CPDMA_DMACONTROL,	2,  1,      ACCESS_RW},
-	[CPDMA_RX_OWNERSHIP_FLIP] = {CPDMA_DMACONTROL,	1,  1,      ACCESS_RW},
-	[CPDMA_TX_PRIO_FIXED]	  = {CPDMA_DMACONTROL,	0,  1,      ACCESS_RW},
-	[CPDMA_STAT_IDLE]	  = {CPDMA_DMASTATUS,	31, 1,      ACCESS_RO},
-	[CPDMA_STAT_TX_ERR_CODE]  = {CPDMA_DMASTATUS,	20, 0xf,    ACCESS_RW},
-	[CPDMA_STAT_TX_ERR_CHAN]  = {CPDMA_DMASTATUS,	16, 0x7,    ACCESS_RW},
-	[CPDMA_STAT_RX_ERR_CODE]  = {CPDMA_DMASTATUS,	12, 0xf,    ACCESS_RW},
-	[CPDMA_STAT_RX_ERR_CHAN]  = {CPDMA_DMASTATUS,	8,  0x7,    ACCESS_RW},
-	[CPDMA_RX_BUFFER_OFFSET]  = {CPDMA_RXBUFFOFS,	0,  0xffff, ACCESS_RW},
-};
-
-int cpdma_control_get(struct cpdma_ctlr *ctlr, int control)
-{
-	unsigned long flags;
-	struct cpdma_control_info *info = &controls[control];
-	int ret;
-
-	spin_lock_irqsave(&ctlr->lock, flags);
-
-	ret = -ENOTSUPP;
-	if (!ctlr->params.has_ext_regs)
-		goto unlock_ret;
-
-	ret = -EINVAL;
-	if (ctlr->state != CPDMA_STATE_ACTIVE)
-		goto unlock_ret;
-
-	ret = -ENOENT;
-	if (control < 0 || control >= ARRAY_SIZE(controls))
-		goto unlock_ret;
-
-	ret = -EPERM;
-	if ((info->access & ACCESS_RO) != ACCESS_RO)
-		goto unlock_ret;
-
-	ret = (dma_reg_read(ctlr, info->reg) >> info->shift) & info->mask;
-
-unlock_ret:
-	spin_unlock_irqrestore(&ctlr->lock, flags);
-	return ret;
-}
-
-int cpdma_control_set(struct cpdma_ctlr *ctlr, int control, int value)
-{
-	unsigned long flags;
-	struct cpdma_control_info *info = &controls[control];
-	int ret;
-	u32 val;
-
-	spin_lock_irqsave(&ctlr->lock, flags);
-
-	ret = -ENOTSUPP;
-	if (!ctlr->params.has_ext_regs)
-		goto unlock_ret;
-
-	ret = -EINVAL;
-	if (ctlr->state != CPDMA_STATE_ACTIVE)
-		goto unlock_ret;
-
-	ret = -ENOENT;
-	if (control < 0 || control >= ARRAY_SIZE(controls))
-		goto unlock_ret;
-
-	ret = -EPERM;
-	if ((info->access & ACCESS_WO) != ACCESS_WO)
-		goto unlock_ret;
-
-	val  = dma_reg_read(ctlr, info->reg);
-	val &= ~(info->mask << info->shift);
-	val |= (value & info->mask) << info->shift;
-	dma_reg_write(ctlr, info->reg, val);
-	ret = 0;
-
-unlock_ret:
-	spin_unlock_irqrestore(&ctlr->lock, flags);
-	return ret;
-}