@@ -2,11 +2,13 @@
# Makefile for the Linux network (ethercard) device drivers.
#
obj-$(CONFIG_MII) += mii.o
obj-$(CONFIG_MDIO) += mdio.o
obj-$(CONFIG_PHYLIB) += phy/
-obj-$(CONFIG_TI_DAVINCI_EMAC) += davinci_emac.o
+obj-$(CONFIG_TI_DAVINCI_EMAC) += davinci_emac.o davinci_cpdma.o
obj-$(CONFIG_TI_DAVINCI_MDIO) += davinci_mdio.o
obj-$(CONFIG_E1000) += e1000/
new file mode 100644
@@ -0,0 +1,676 @@
+
+#define DEBUG
+
+#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_RXINTSTATRAW 0xa0
+#define CPDMA_RXINTSTATMASKED 0xa4
+#define CPDMA_RXINTMASKSET 0xa8
+#define CPDMA_RXINTMASKCLEAR 0xac
+
+/* 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;
+ void *sw_pad;
+ u32 sw_buffer;
+ u32 sw_len;
+};
+
+struct cpdma_desc_pool {
+ u32 phys;
+ 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,
+};
+
+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, val) __raw_writel(val, (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, 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);
+ } else {
+ pool->cpumap = dma_alloc_coherent(dev, size, &pool->phys,
+ GFP_KERNEL);
+ pool->phys = (__force u32)pool->cpumap;
+ pool->iomap = (void __force __iomem *)pool->cpumap;
+ }
+
+ 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;
+
+ 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->phys + (__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->phys : 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_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_destroy(struct cpdma_ctlr *ctlr)
+{
+ unsigned long flags;
+ int ret = 0, i;
+
+ 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;
+}
+
+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_num % CPDMA_MAX_CHANNELS);
+
+ 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);
+err_chan_alloc:
+ return ERR_PTR(ret);
+}
+
+int cpdma_chan_destroy(struct cpdma_chan *chan)
+{
+ struct cpdma_ctlr *ctlr = chan->ctlr;
+ unsigned long flags;
+
+ 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;
+}
+
+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;
+
+ 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 */
+ if (desc_read(prev, hw_mode) & CPDMA_DESC_EOQ &&
+ chan->state == CPDMA_STATE_ACTIVE) {
+ 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;
+ void *pad = NULL;
+ 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) {
+ if (WARN_ONCE(is_rx_chan(chan), "runt receive buffer\n")) {
+ cpdma_desc_free(ctlr->pool, desc, 1);
+ chan->stats.runt_receive_buff++;
+ ret = -EINVAL;
+ goto unlock_ret;
+ }
+
+ pad = kzalloc(ctlr->params.min_packet_size, gfp_mask);
+ if (!pad) {
+ cpdma_desc_free(ctlr->pool, desc, 1);
+ chan->stats.pad_alloc_fail++;
+ ret = -ENOMEM;
+ goto unlock_ret;
+ }
+ chan->stats.pad_enqueue++;
+ memcpy(pad, data, len);
+ data = pad;
+ len = ctlr->params.min_packet_size;
+ }
+
+ 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_pad, pad);
+ 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 *pad, *token;
+
+ pad = (void *)desc_read(desc, sw_pad);
+ 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);
+ kfree(pad);
+ cpdma_desc_free(pool, desc, 1);
+ (*chan->handler)(token, outlen, status);
+}
+
+static int __cpdma_chan_process(struct cpdma_chan *chan, bool waitown)
+{
+ 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++;
+
+ 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, ret = 0;
+
+ if (chan->state != CPDMA_STATE_ACTIVE)
+ return -EINVAL;
+
+ for (used = 0; used < quota && ret >= 0; used++)
+ ret = __cpdma_chan_process(chan, false);
+
+ 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, true);
+ 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;
+}
new file mode 100644
@@ -0,0 +1,60 @@
+#ifndef __DAVINCI_CPDMA_H__
+#define __DAVINCI_CPDMA_H__
+
+#define CPDMA_MAX_CHANNELS BITS_PER_LONG
+
+#define tx_chan_num(chan) (chan)
+#define rx_chan_num(chan) ((chan) + CPDMA_MAX_CHANNELS)
+#define is_rx_chan(chan) ((chan)->chan_num >= CPDMA_MAX_CHANNELS)
+#define is_tx_chan(chan) (!is_rx_chan(chan))
+#define __chan_linear(chan_num) ((chan_num) & (CPDMA_MAX_CHANNELS - 1))
+#define chan_linear(chan) __chan_linear((chan)->chan_num)
+
+struct cpdma_params {
+ struct device *dev;
+ void __iomem *dmaregs;
+ void __iomem *txhdp, *rxhdp, *txcp, *rxcp;
+ void __iomem *rxthresh, *rxfree;
+ int num_chan;
+ bool has_soft_reset;
+ int min_packet_size;
+ u32 desc_mem_phys;
+ int desc_mem_size;
+ int desc_align;
+};
+
+struct cpdma_chan_stats {
+ u32 head_enqueue;
+ u32 tail_enqueue;
+ u32 pad_enqueue;
+ u32 misqueued;
+ u32 desc_alloc_fail;
+ u32 pad_alloc_fail;
+ u32 runt_receive_buff;
+ u32 empty_dequeue;
+ u32 busy_dequeue;
+ u32 good_dequeue;
+ u32 teardown_dequeue;
+};
+
+struct cpdma_ctlr;
+struct cpdma_chan;
+
+typedef void (*cpdma_handler_fn)(void *token, int len, int status);
+
+struct cpdma_ctlr *cpdma_ctlr_create(struct cpdma_params *params);
+int cpdma_ctlr_destroy(struct cpdma_ctlr *ctlr);
+int cpdma_ctlr_start(struct cpdma_ctlr *ctlr);
+int cpdma_ctlr_stop(struct cpdma_ctlr *ctlr);
+
+struct cpdma_chan *cpdma_chan_create(struct cpdma_ctlr *ctlr, int chan_num,
+ cpdma_handler_fn handler);
+int cpdma_chan_destroy(struct cpdma_chan *chan);
+int cpdma_chan_start(struct cpdma_chan *chan);
+int cpdma_chan_stop(struct cpdma_chan *chan);
+
+int cpdma_chan_submit(struct cpdma_chan *chan, void *token, void *data,
+ int len, gfp_t gfp_mask);
+int cpdma_chan_process(struct cpdma_chan *chan, int quota);
+
+#endif