--- /dev/null
+/* linux/arch/arm/plat-samsung/s3c-pl330.c
+ *
+ * Copyright (C) 2010 Samsung Electronics Co. Ltd.
+ * Jaswinder Singh <jassi.brar@samsung.com>
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+
+#include <asm/hardware/pl330.h>
+
+#include <plat/s3c-pl330-pdata.h>
+
+/**
+ * struct s3c_pl330_dmac - Logical representation of a PL330 DMAC.
+ * @busy_chan: Number of channels currently busy.
+ * @peri: List of IDs of peripherals this DMAC can work with.
+ * @node: To attach to the global list of DMACs.
+ * @pi: PL330 configuration info for the DMAC.
+ * @kmcache: Pool to quickly allocate xfers for all channels in the dmac.
+ */
+struct s3c_pl330_dmac {
+ unsigned busy_chan;
+ enum dma_ch *peri;
+ struct list_head node;
+ struct pl330_info *pi;
+ struct kmem_cache *kmcache;
+};
+
+/**
+ * struct s3c_pl330_xfer - A request submitted by S3C DMA clients.
+ * @token: Xfer ID provided by the client.
+ * @node: To attach to the list of xfers on a channel.
+ * @px: Xfer for PL330 core.
+ * @chan: Owner channel of this xfer.
+ */
+struct s3c_pl330_xfer {
+ void *token;
+ struct list_head node;
+ struct pl330_xfer px;
+ struct s3c_pl330_chan *chan;
+};
+
+/**
+ * struct s3c_pl330_chan - Logical channel to communicate with
+ * a Physical peripheral.
+ * @pl330_chan_id: Token of a hardware channel thread of PL330 DMAC.
+ * NULL if the channel is available to be acquired.
+ * @id: ID of the peripheral that this channel can communicate with.
+ * @options: Options specified by the client.
+ * @sdaddr: Address provided via s3c2410_dma_devconfig.
+ * @node: To attach to the global list of channels.
+ * @lrq: Pointer to the last submitted pl330_req to PL330 core.
+ * @xfer_list: To manage list of xfers enqueued.
+ * @req: Two requests to communicate with the PL330 engine.
+ * @callback_fn: Callback function to the client.
+ * @rqcfg: Channel configuration for the xfers.
+ * @xfer_head: Pointer to the xfer to be next excecuted.
+ * @dmac: Pointer to the DMAC that manages this channel, NULL if the
+ * channel is available to be acquired.
+ * @client: Client of this channel. NULL if the
+ * channel is available to be acquired.
+ */
+struct s3c_pl330_chan {
+ void *pl330_chan_id;
+ enum dma_ch id;
+ unsigned int options;
+ unsigned long sdaddr;
+ struct list_head node;
+ struct pl330_req *lrq;
+ struct list_head xfer_list;
+ struct pl330_req req[2];
+ s3c2410_dma_cbfn_t callback_fn;
+ struct pl330_reqcfg rqcfg;
+ struct s3c_pl330_xfer *xfer_head;
+ struct s3c_pl330_dmac *dmac;
+ struct s3c2410_dma_client *client;
+};
+
+/* All DMACs in the platform */
+static LIST_HEAD(dmac_list);
+
+/* All channels to peripherals in the platform */
+static LIST_HEAD(chan_list);
+
+/*
+ * Since we add resources(DMACs and Channels) to the global pool,
+ * we need to guard access to the resources using a global lock
+ */
+static DEFINE_SPINLOCK(res_lock);
+
+/* Returns the channel with ID 'id' in the chan_list */
+static struct s3c_pl330_chan *id_to_chan(const enum dma_ch id)
+{
+ struct s3c_pl330_chan *ch;
+
+ list_for_each_entry(ch, &chan_list, node)
+ if (ch->id == id)
+ return ch;
+
+ return NULL;
+}
+
+/* Allocate a new channel with ID 'id' and add to chan_list */
+static void chan_add(const enum dma_ch id)
+{
+ struct s3c_pl330_chan *ch = id_to_chan(id);
+
+ /* Return if the channel already exists */
+ if (ch)
+ return;
+
+ ch = kmalloc(sizeof(*ch), GFP_KERNEL);
+ /* Return silently to work with other channels */
+ if (!ch)
+ return;
+
+ ch->id = id;
+ ch->dmac = NULL;
+
+ list_add_tail(&ch->node, &chan_list);
+}
+
+/* If the channel is not yet acquired by any client */
+static bool chan_free(struct s3c_pl330_chan *ch)
+{
+ if (!ch)
+ return false;
+
+ /* Channel points to some DMAC only when it's acquired */
+ return ch->dmac ? false : true;
+}
+
+/*
+ * Returns 0 is peripheral i/f is invalid or not present on the dmac.
+ * Index + 1, otherwise.
+ */
+static unsigned iface_of_dmac(struct s3c_pl330_dmac *dmac, enum dma_ch ch_id)
+{
+ enum dma_ch *id = dmac->peri;
+ int i;
+
+ /* Discount invalid markers */
+ if (ch_id == DMACH_MAX)
+ return 0;
+
+ for (i = 0; i < PL330_MAX_PERI; i++)
+ if (id[i] == ch_id)
+ return i + 1;
+
+ return 0;
+}
+
+/* If all channel threads of the DMAC are busy */
+static inline bool dmac_busy(struct s3c_pl330_dmac *dmac)
+{
+ struct pl330_info *pi = dmac->pi;
+
+ return (dmac->busy_chan < pi->pcfg.num_chan) ? false : true;
+}
+
+/*
+ * Returns the number of free channels that
+ * can be handled by this dmac only.
+ */
+static unsigned ch_onlyby_dmac(struct s3c_pl330_dmac *dmac)
+{
+ enum dma_ch *id = dmac->peri;
+ struct s3c_pl330_dmac *d;
+ struct s3c_pl330_chan *ch;
+ unsigned found, count = 0;
+ enum dma_ch p;
+ int i;
+
+ for (i = 0; i < PL330_MAX_PERI; i++) {
+ p = id[i];
+ ch = id_to_chan(p);
+
+ if (p == DMACH_MAX || !chan_free(ch))
+ continue;
+
+ found = 0;
+ list_for_each_entry(d, &dmac_list, node) {
+ if (d != dmac && iface_of_dmac(d, ch->id)) {
+ found = 1;
+ break;
+ }
+ }
+ if (!found)
+ count++;
+ }
+
+ return count;
+}
+
+/*
+ * Measure of suitability of 'dmac' handling 'ch'
+ *
+ * 0 indicates 'dmac' can not handle 'ch' either
+ * because it is not supported by the hardware or
+ * because all dmac channels are currently busy.
+ *
+ * >0 vlaue indicates 'dmac' has the capability.
+ * The bigger the value the more suitable the dmac.
+ */
+#define MAX_SUIT UINT_MAX
+#define MIN_SUIT 0
+
+static unsigned suitablility(struct s3c_pl330_dmac *dmac,
+ struct s3c_pl330_chan *ch)
+{
+ struct pl330_info *pi = dmac->pi;
+ enum dma_ch *id = dmac->peri;
+ struct s3c_pl330_dmac *d;
+ unsigned s;
+ int i;
+
+ s = MIN_SUIT;
+ /* If all the DMAC channel threads are busy */
+ if (dmac_busy(dmac))
+ return s;
+
+ for (i = 0; i < PL330_MAX_PERI; i++)
+ if (id[i] == ch->id)
+ break;
+
+ /* If the 'dmac' can't talk to 'ch' */
+ if (i == PL330_MAX_PERI)
+ return s;
+
+ s = MAX_SUIT;
+ list_for_each_entry(d, &dmac_list, node) {
+ /*
+ * If some other dmac can talk to this
+ * peri and has some channel free.
+ */
+ if (d != dmac && iface_of_dmac(d, ch->id) && !dmac_busy(d)) {
+ s = 0;
+ break;
+ }
+ }
+ if (s)
+ return s;
+
+ s = 100;
+
+ /* Good if free chans are more, bad otherwise */
+ s += (pi->pcfg.num_chan - dmac->busy_chan) - ch_onlyby_dmac(dmac);
+
+ return s;
+}
+
+/* More than one DMAC may have capability to transfer data with the
+ * peripheral. This function assigns most suitable DMAC to manage the
+ * channel and hence communicate with the peripheral.
+ */
+static struct s3c_pl330_dmac *map_chan_to_dmac(struct s3c_pl330_chan *ch)
+{
+ struct s3c_pl330_dmac *d, *dmac = NULL;
+ unsigned sn, sl = MIN_SUIT;
+
+ list_for_each_entry(d, &dmac_list, node) {
+ sn = suitablility(d, ch);
+
+ if (sn == MAX_SUIT)
+ return d;
+
+ if (sn > sl)
+ dmac = d;
+ }
+
+ return dmac;
+}
+
+/* Acquire the channel for peripheral 'id' */
+static struct s3c_pl330_chan *chan_acquire(const enum dma_ch id)
+{
+ struct s3c_pl330_chan *ch = id_to_chan(id);
+ struct s3c_pl330_dmac *dmac;
+
+ /* If the channel doesn't exist or is already acquired */
+ if (!ch || !chan_free(ch)) {
+ ch = NULL;
+ goto acq_exit;
+ }
+
+ dmac = map_chan_to_dmac(ch);
+ /* If couldn't map */
+ if (!dmac) {
+ ch = NULL;
+ goto acq_exit;
+ }
+
+ dmac->busy_chan++;
+ ch->dmac = dmac;
+
+acq_exit:
+ return ch;
+}
+
+/* Delete xfer from the queue */
+static inline void del_from_queue(struct s3c_pl330_xfer *xfer)
+{
+ struct s3c_pl330_xfer *t;
+ struct s3c_pl330_chan *ch;
+ int found;
+
+ if (!xfer)
+ return;
+
+ ch = xfer->chan;
+
+ /* Make sure xfer is in the queue */
+ found = 0;
+ list_for_each_entry(t, &ch->xfer_list, node)
+ if (t == xfer) {
+ found = 1;
+ break;
+ }
+
+ if (!found)
+ return;
+
+ /* If xfer is last entry in the queue */
+ if (xfer->node.next == &ch->xfer_list)
+ t = list_entry(ch->xfer_list.next,
+ struct s3c_pl330_xfer, node);
+ else
+ t = list_entry(xfer->node.next,
+ struct s3c_pl330_xfer, node);
+
+ /* If there was only one node left */
+ if (t == xfer)
+ ch->xfer_head = NULL;
+ else if (ch->xfer_head == xfer)
+ ch->xfer_head = t;
+
+ list_del(&xfer->node);
+}
+
+/* Provides pointer to the next xfer in the queue.
+ * If CIRCULAR option is set, the list is left intact,
+ * otherwise the xfer is removed from the list.
+ * Forced delete 'pluck' can be set to override the CIRCULAR option.
+ */
+static struct s3c_pl330_xfer *get_from_queue(struct s3c_pl330_chan *ch,
+ int pluck)
+{
+ struct s3c_pl330_xfer *xfer = ch->xfer_head;
+
+ if (!xfer)
+ return NULL;
+
+ /* If xfer is last entry in the queue */
+ if (xfer->node.next == &ch->xfer_list)
+ ch->xfer_head = list_entry(ch->xfer_list.next,
+ struct s3c_pl330_xfer, node);
+ else
+ ch->xfer_head = list_entry(xfer->node.next,
+ struct s3c_pl330_xfer, node);
+
+ if (pluck || !(ch->options & S3C2410_DMAF_CIRCULAR))
+ del_from_queue(xfer);
+
+ return xfer;
+}
+
+static inline void add_to_queue(struct s3c_pl330_chan *ch,
+ struct s3c_pl330_xfer *xfer, int front)
+{
+ struct pl330_xfer *xt;
+
+ /* If queue empty */
+ if (ch->xfer_head == NULL)
+ ch->xfer_head = xfer;
+
+ xt = &ch->xfer_head->px;
+ /* If the head already submitted (CIRCULAR head) */
+ if (ch->options & S3C2410_DMAF_CIRCULAR &&
+ (xt == ch->req[0].x || xt == ch->req[1].x))
+ ch->xfer_head = xfer;
+
+ /* If this is a resubmission, it should go at the head */
+ if (front) {
+ ch->xfer_head = xfer;
+ list_add(&xfer->node, &ch->xfer_list);
+ } else {
+ list_add_tail(&xfer->node, &ch->xfer_list);
+ }
+}
+
+static inline void _finish_off(struct s3c_pl330_xfer *xfer,
+ enum s3c2410_dma_buffresult res, int ffree)
+{
+ struct s3c_pl330_chan *ch;
+
+ if (!xfer)
+ return;
+
+ ch = xfer->chan;
+
+ /* Do callback */
+ if (ch->callback_fn)
+ ch->callback_fn(NULL, xfer->token, xfer->px.bytes, res);
+
+ /* Force Free or if buffer is not needed anymore */
+ if (ffree || !(ch->options & S3C2410_DMAF_CIRCULAR))
+ kmem_cache_free(ch->dmac->kmcache, xfer);
+}
+
+static inline int s3c_pl330_submit(struct s3c_pl330_chan *ch,
+ struct pl330_req *r)
+{
+ struct s3c_pl330_xfer *xfer;
+ int ret = 0;
+
+ /* If already submitted */
+ if (r->x)
+ return 0;
+
+ xfer = get_from_queue(ch, 0);
+ if (xfer) {
+ r->x = &xfer->px;
+
+ /* Use max bandwidth for M<->M xfers */
+ if (r->rqtype == MEMTOMEM) {
+ struct pl330_info *pi = xfer->chan->dmac->pi;
+ int burst = 1 << ch->rqcfg.brst_size;
+ u32 bytes = r->x->bytes;
+ int bl;
+
+ bl = pi->pcfg.data_bus_width / 8;
+ bl *= pi->pcfg.data_buf_dep;
+ bl /= burst;
+
+ /* src/dst_burst_len can't be more than 16 */
+ if (bl > 16)
+ bl = 16;
+
+ while (bl > 1) {
+ if (!(bytes % (bl * burst)))
+ break;
+ bl--;
+ }
+
+ ch->rqcfg.brst_len = bl;
+ } else {
+ ch->rqcfg.brst_len = 1;
+ }
+
+ ret = pl330_submit_req(ch->pl330_chan_id, r);
+
+ /* If submission was successful */
+ if (!ret) {
+ ch->lrq = r; /* latest submitted req */
+ return 0;
+ }
+
+ r->x = NULL;
+
+ /* If both of the PL330 ping-pong buffers filled */
+ if (ret == -EAGAIN) {
+ dev_err(ch->dmac->pi->dev, "%s:%d!\n",
+ __func__, __LINE__);
+ /* Queue back again */
+ add_to_queue(ch, xfer, 1);
+ ret = 0;
+ } else {
+ dev_err(ch->dmac->pi->dev, "%s:%d!\n",
+ __func__, __LINE__);
+ _finish_off(xfer, S3C2410_RES_ERR, 0);
+ }
+ }
+
+ return ret;
+}
+
+static void s3c_pl330_rq(struct s3c_pl330_chan *ch,
+ struct pl330_req *r, enum pl330_op_err err)
+{
+ unsigned long flags;
+ struct s3c_pl330_xfer *xfer;
+ struct pl330_xfer *xl = r->x;
+ enum s3c2410_dma_buffresult res;
+
+ spin_lock_irqsave(&res_lock, flags);
+
+ r->x = NULL;
+
+ s3c_pl330_submit(ch, r);
+
+ spin_unlock_irqrestore(&res_lock, flags);
+
+ /* Map result to S3C DMA API */
+ if (err == PL330_ERR_NONE)
+ res = S3C2410_RES_OK;
+ else if (err == PL330_ERR_ABORT)
+ res = S3C2410_RES_ABORT;
+ else
+ res = S3C2410_RES_ERR;
+
+ /* If last request had some xfer */
+ if (xl) {
+ xfer = container_of(xl, struct s3c_pl330_xfer, px);
+ _finish_off(xfer, res, 0);
+ } else {
+ dev_info(ch->dmac->pi->dev, "%s:%d No Xfer?!\n",
+ __func__, __LINE__);
+ }
+}
+
+static void s3c_pl330_rq0(void *token, enum pl330_op_err err)
+{
+ struct pl330_req *r = token;
+ struct s3c_pl330_chan *ch = container_of(r,
+ struct s3c_pl330_chan, req[0]);
+ s3c_pl330_rq(ch, r, err);
+}
+
+static void s3c_pl330_rq1(void *token, enum pl330_op_err err)
+{
+ struct pl330_req *r = token;
+ struct s3c_pl330_chan *ch = container_of(r,
+ struct s3c_pl330_chan, req[1]);
+ s3c_pl330_rq(ch, r, err);
+}
+
+/* Release an acquired channel */
+static void chan_release(struct s3c_pl330_chan *ch)
+{
+ struct s3c_pl330_dmac *dmac;
+
+ if (chan_free(ch))
+ return;
+
+ dmac = ch->dmac;
+ ch->dmac = NULL;
+ dmac->busy_chan--;
+}
+
+int s3c2410_dma_ctrl(enum dma_ch id, enum s3c2410_chan_op op)
+{
+ struct s3c_pl330_xfer *xfer;
+ enum pl330_chan_op pl330op;
+ struct s3c_pl330_chan *ch;
+ unsigned long flags;
+ int idx, ret;
+
+ spin_lock_irqsave(&res_lock, flags);
+
+ ch = id_to_chan(id);
+
+ if (!ch || chan_free(ch)) {
+ ret = -EINVAL;
+ goto ctrl_exit;
+ }
+
+ switch (op) {
+ case S3C2410_DMAOP_START:
+ /* Make sure both reqs are enqueued */
+ idx = (ch->lrq == &ch->req[0]) ? 1 : 0;
+ s3c_pl330_submit(ch, &ch->req[idx]);
+ s3c_pl330_submit(ch, &ch->req[1 - idx]);
+ pl330op = PL330_OP_START;
+ break;
+
+ case S3C2410_DMAOP_STOP:
+ pl330op = PL330_OP_ABORT;
+ break;
+
+ case S3C2410_DMAOP_FLUSH:
+ pl330op = PL330_OP_FLUSH;
+ break;
+
+ case S3C2410_DMAOP_PAUSE:
+ case S3C2410_DMAOP_RESUME:
+ case S3C2410_DMAOP_TIMEOUT:
+ case S3C2410_DMAOP_STARTED:
+ spin_unlock_irqrestore(&res_lock, flags);
+ return 0;
+
+ default:
+ spin_unlock_irqrestore(&res_lock, flags);
+ return -EINVAL;
+ }
+
+ ret = pl330_chan_ctrl(ch->pl330_chan_id, pl330op);
+
+ if (pl330op == PL330_OP_START) {
+ spin_unlock_irqrestore(&res_lock, flags);
+ return ret;
+ }
+
+ idx = (ch->lrq == &ch->req[0]) ? 1 : 0;
+
+ /* Abort the current xfer */
+ if (ch->req[idx].x) {
+ xfer = container_of(ch->req[idx].x,
+ struct s3c_pl330_xfer, px);
+
+ /* Drop xfer during FLUSH */
+ if (pl330op == PL330_OP_FLUSH)
+ del_from_queue(xfer);
+
+ ch->req[idx].x = NULL;
+
+ spin_unlock_irqrestore(&res_lock, flags);
+ _finish_off(xfer, S3C2410_RES_ABORT,
+ pl330op == PL330_OP_FLUSH ? 1 : 0);
+ spin_lock_irqsave(&res_lock, flags);
+ }
+
+ /* Flush the whole queue */
+ if (pl330op == PL330_OP_FLUSH) {
+
+ if (ch->req[1 - idx].x) {
+ xfer = container_of(ch->req[1 - idx].x,
+ struct s3c_pl330_xfer, px);
+
+ del_from_queue(xfer);
+
+ ch->req[1 - idx].x = NULL;
+
+ spin_unlock_irqrestore(&res_lock, flags);
+ _finish_off(xfer, S3C2410_RES_ABORT, 1);
+ spin_lock_irqsave(&res_lock, flags);
+ }
+
+ /* Finish off the remaining in the queue */
+ xfer = ch->xfer_head;
+ while (xfer) {
+
+ del_from_queue(xfer);
+
+ spin_unlock_irqrestore(&res_lock, flags);
+ _finish_off(xfer, S3C2410_RES_ABORT, 1);
+ spin_lock_irqsave(&res_lock, flags);
+
+ xfer = ch->xfer_head;
+ }
+ }
+
+ctrl_exit:
+ spin_unlock_irqrestore(&res_lock, flags);
+
+ return ret;
+}
+EXPORT_SYMBOL(s3c2410_dma_ctrl);
+
+int s3c2410_dma_enqueue(enum dma_ch id, void *token,
+ dma_addr_t addr, int size)
+{
+ struct s3c_pl330_chan *ch;
+ struct s3c_pl330_xfer *xfer;
+ unsigned long flags;
+ int idx, ret = 0;
+
+ spin_lock_irqsave(&res_lock, flags);
+
+ ch = id_to_chan(id);
+
+ /* Error if invalid or free channel */
+ if (!ch || chan_free(ch)) {
+ ret = -EINVAL;
+ goto enq_exit;
+ }
+
+ /* Error if size is unaligned */
+ if (ch->rqcfg.brst_size && size % (1 << ch->rqcfg.brst_size)) {
+ ret = -EINVAL;
+ goto enq_exit;
+ }
+
+ xfer = kmem_cache_alloc(ch->dmac->kmcache, GFP_ATOMIC);
+ if (!xfer) {
+ ret = -ENOMEM;
+ goto enq_exit;
+ }
+
+ xfer->token = token;
+ xfer->chan = ch;
+ xfer->px.bytes = size;
+ xfer->px.next = NULL; /* Single request */
+
+ /* For S3C DMA API, direction is always fixed for all xfers */
+ if (ch->req[0].rqtype == MEMTODEV) {
+ xfer->px.src_addr = addr;
+ xfer->px.dst_addr = ch->sdaddr;
+ } else {
+ xfer->px.src_addr = ch->sdaddr;
+ xfer->px.dst_addr = addr;
+ }
+
+ add_to_queue(ch, xfer, 0);
+
+ /* Try submitting on either request */
+ idx = (ch->lrq == &ch->req[0]) ? 1 : 0;
+
+ if (!ch->req[idx].x)
+ s3c_pl330_submit(ch, &ch->req[idx]);
+ else
+ s3c_pl330_submit(ch, &ch->req[1 - idx]);
+
+ spin_unlock_irqrestore(&res_lock, flags);
+
+ if (ch->options & S3C2410_DMAF_AUTOSTART)
+ s3c2410_dma_ctrl(id, S3C2410_DMAOP_START);
+
+ return 0;
+
+enq_exit:
+ spin_unlock_irqrestore(&res_lock, flags);
+
+ return ret;
+}
+EXPORT_SYMBOL(s3c2410_dma_enqueue);
+
+int s3c2410_dma_request(enum dma_ch id,
+ struct s3c2410_dma_client *client,
+ void *dev)
+{
+ struct s3c_pl330_dmac *dmac;
+ struct s3c_pl330_chan *ch;
+ unsigned long flags;
+ int ret = 0;
+
+ spin_lock_irqsave(&res_lock, flags);
+
+ ch = chan_acquire(id);
+ if (!ch) {
+ ret = -EBUSY;
+ goto req_exit;
+ }
+
+ dmac = ch->dmac;
+
+ ch->pl330_chan_id = pl330_request_channel(dmac->pi);
+ if (!ch->pl330_chan_id) {
+ chan_release(ch);
+ ret = -EBUSY;
+ goto req_exit;
+ }
+
+ ch->client = client;
+ ch->options = 0; /* Clear any option */
+ ch->callback_fn = NULL; /* Clear any callback */
+ ch->lrq = NULL;
+
+ ch->rqcfg.brst_size = 2; /* Default word size */
+ ch->rqcfg.swap = SWAP_NO;
+ ch->rqcfg.scctl = SCCTRL0; /* Noncacheable and nonbufferable */
+ ch->rqcfg.dcctl = DCCTRL0; /* Noncacheable and nonbufferable */
+ ch->rqcfg.privileged = 0;
+ ch->rqcfg.insnaccess = 0;
+
+ /* Set invalid direction */
+ ch->req[0].rqtype = DEVTODEV;
+ ch->req[1].rqtype = ch->req[0].rqtype;
+
+ ch->req[0].cfg = &ch->rqcfg;
+ ch->req[1].cfg = ch->req[0].cfg;
+
+ ch->req[0].peri = iface_of_dmac(dmac, id) - 1; /* Original index */
+ ch->req[1].peri = ch->req[0].peri;
+
+ ch->req[0].token = &ch->req[0];
+ ch->req[0].xfer_cb = s3c_pl330_rq0;
+ ch->req[1].token = &ch->req[1];
+ ch->req[1].xfer_cb = s3c_pl330_rq1;
+
+ ch->req[0].x = NULL;
+ ch->req[1].x = NULL;
+
+ /* Reset xfer list */
+ INIT_LIST_HEAD(&ch->xfer_list);
+ ch->xfer_head = NULL;
+
+req_exit:
+ spin_unlock_irqrestore(&res_lock, flags);
+
+ return ret;
+}
+EXPORT_SYMBOL(s3c2410_dma_request);
+
+int s3c2410_dma_free(enum dma_ch id, struct s3c2410_dma_client *client)
+{
+ struct s3c_pl330_chan *ch;
+ struct s3c_pl330_xfer *xfer;
+ unsigned long flags;
+ int ret = 0;
+ unsigned idx;
+
+ spin_lock_irqsave(&res_lock, flags);
+
+ ch = id_to_chan(id);
+
+ if (!ch || chan_free(ch))
+ goto free_exit;
+
+ /* Refuse if someone else wanted to free the channel */
+ if (ch->client != client) {
+ ret = -EBUSY;
+ goto free_exit;
+ }
+
+ /* Stop any active xfer, Flushe the queue and do callbacks */
+ pl330_chan_ctrl(ch->pl330_chan_id, PL330_OP_FLUSH);
+
+ /* Abort the submitted requests */
+ idx = (ch->lrq == &ch->req[0]) ? 1 : 0;
+
+ if (ch->req[idx].x) {
+ xfer = container_of(ch->req[idx].x,
+ struct s3c_pl330_xfer, px);
+
+ ch->req[idx].x = NULL;
+ del_from_queue(xfer);
+
+ spin_unlock_irqrestore(&res_lock, flags);
+ _finish_off(xfer, S3C2410_RES_ABORT, 1);
+ spin_lock_irqsave(&res_lock, flags);
+ }
+
+ if (ch->req[1 - idx].x) {
+ xfer = container_of(ch->req[1 - idx].x,
+ struct s3c_pl330_xfer, px);
+
+ ch->req[1 - idx].x = NULL;
+ del_from_queue(xfer);
+
+ spin_unlock_irqrestore(&res_lock, flags);
+ _finish_off(xfer, S3C2410_RES_ABORT, 1);
+ spin_lock_irqsave(&res_lock, flags);
+ }
+
+ /* Pluck and Abort the queued requests in order */
+ do {
+ xfer = get_from_queue(ch, 1);
+
+ spin_unlock_irqrestore(&res_lock, flags);
+ _finish_off(xfer, S3C2410_RES_ABORT, 1);
+ spin_lock_irqsave(&res_lock, flags);
+ } while (xfer);
+
+ ch->client = NULL;
+
+ pl330_release_channel(ch->pl330_chan_id);
+
+ ch->pl330_chan_id = NULL;
+
+ chan_release(ch);
+
+free_exit:
+ spin_unlock_irqrestore(&res_lock, flags);
+
+ return ret;
+}
+EXPORT_SYMBOL(s3c2410_dma_free);
+
+int s3c2410_dma_config(enum dma_ch id, int xferunit)
+{
+ struct s3c_pl330_chan *ch;
+ struct pl330_info *pi;
+ unsigned long flags;
+ int i, dbwidth, ret = 0;
+
+ spin_lock_irqsave(&res_lock, flags);
+
+ ch = id_to_chan(id);
+
+ if (!ch || chan_free(ch)) {
+ ret = -EINVAL;
+ goto cfg_exit;
+ }
+
+ pi = ch->dmac->pi;
+ dbwidth = pi->pcfg.data_bus_width / 8;
+
+ /* Max size of xfer can be pcfg.data_bus_width */
+ if (xferunit > dbwidth) {
+ ret = -EINVAL;
+ goto cfg_exit;
+ }
+
+ i = 0;
+ while (xferunit != (1 << i))
+ i++;
+
+ /* If valid value */
+ if (xferunit == (1 << i))
+ ch->rqcfg.brst_size = i;
+ else
+ ret = -EINVAL;
+
+cfg_exit:
+ spin_unlock_irqrestore(&res_lock, flags);
+
+ return ret;
+}
+EXPORT_SYMBOL(s3c2410_dma_config);
+
+/* Options that are supported by this driver */
+#define S3C_PL330_FLAGS (S3C2410_DMAF_CIRCULAR | S3C2410_DMAF_AUTOSTART)
+
+int s3c2410_dma_setflags(enum dma_ch id, unsigned int options)
+{
+ struct s3c_pl330_chan *ch;
+ unsigned long flags;
+ int ret = 0;
+
+ spin_lock_irqsave(&res_lock, flags);
+
+ ch = id_to_chan(id);
+
+ if (!ch || chan_free(ch) || options & ~(S3C_PL330_FLAGS))
+ ret = -EINVAL;
+ else
+ ch->options = options;
+
+ spin_unlock_irqrestore(&res_lock, flags);
+
+ return 0;
+}
+EXPORT_SYMBOL(s3c2410_dma_setflags);
+
+int s3c2410_dma_set_buffdone_fn(enum dma_ch id, s3c2410_dma_cbfn_t rtn)
+{
+ struct s3c_pl330_chan *ch;
+ unsigned long flags;
+ int ret = 0;
+
+ spin_lock_irqsave(&res_lock, flags);
+
+ ch = id_to_chan(id);
+
+ if (!ch || chan_free(ch))
+ ret = -EINVAL;
+ else
+ ch->callback_fn = rtn;
+
+ spin_unlock_irqrestore(&res_lock, flags);
+
+ return ret;
+}
+EXPORT_SYMBOL(s3c2410_dma_set_buffdone_fn);
+
+int s3c2410_dma_devconfig(enum dma_ch id, enum s3c2410_dmasrc source,
+ unsigned long address)
+{
+ struct s3c_pl330_chan *ch;
+ unsigned long flags;
+ int ret = 0;
+
+ spin_lock_irqsave(&res_lock, flags);
+
+ ch = id_to_chan(id);
+
+ if (!ch || chan_free(ch)) {
+ ret = -EINVAL;
+ goto devcfg_exit;
+ }
+
+ switch (source) {
+ case S3C2410_DMASRC_HW: /* P->M */
+ ch->req[0].rqtype = DEVTOMEM;
+ ch->req[1].rqtype = DEVTOMEM;
+ ch->rqcfg.src_inc = 0;
+ ch->rqcfg.dst_inc = 1;
+ break;
+ case S3C2410_DMASRC_MEM: /* M->P */
+ ch->req[0].rqtype = MEMTODEV;
+ ch->req[1].rqtype = MEMTODEV;
+ ch->rqcfg.src_inc = 1;
+ ch->rqcfg.dst_inc = 0;
+ break;
+ default:
+ ret = -EINVAL;
+ goto devcfg_exit;
+ }
+
+ ch->sdaddr = address;
+
+devcfg_exit:
+ spin_unlock_irqrestore(&res_lock, flags);
+
+ return ret;
+}
+EXPORT_SYMBOL(s3c2410_dma_devconfig);
+
+int s3c2410_dma_getposition(enum dma_ch id, dma_addr_t *src, dma_addr_t *dst)
+{
+ struct s3c_pl330_chan *ch = id_to_chan(id);
+ struct pl330_chanstatus status;
+ int ret;
+
+ if (!ch || chan_free(ch))
+ return -EINVAL;
+
+ ret = pl330_chan_status(ch->pl330_chan_id, &status);
+ if (ret < 0)
+ return ret;
+
+ *src = status.src_addr;
+ *dst = status.dst_addr;
+
+ return 0;
+}
+EXPORT_SYMBOL(s3c2410_dma_getposition);
+
+static irqreturn_t pl330_irq_handler(int irq, void *data)
+{
+ if (pl330_update(data))
+ return IRQ_HANDLED;
+ else
+ return IRQ_NONE;
+}
+
+static int pl330_probe(struct platform_device *pdev)
+{
+ struct s3c_pl330_dmac *s3c_pl330_dmac;
+ struct s3c_pl330_platdata *pl330pd;
+ struct pl330_info *pl330_info;
+ struct resource *res;
+ int i, ret, irq;
+
+ pl330pd = pdev->dev.platform_data;
+
+ /* Can't do without the list of _32_ peripherals */
+ if (!pl330pd || !pl330pd->peri) {
+ dev_err(&pdev->dev, "platform data missing!\n");
+ return -ENODEV;
+ }
+
+ pl330_info = kzalloc(sizeof(*pl330_info), GFP_KERNEL);
+ if (!pl330_info)
+ return -ENOMEM;
+
+ pl330_info->pl330_data = NULL;
+ pl330_info->dev = &pdev->dev;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ ret = -ENODEV;
+ goto probe_err1;
+ }
+
+ request_mem_region(res->start, resource_size(res), pdev->name);
+
+ pl330_info->base = ioremap(res->start, resource_size(res));
+ if (!pl330_info->base) {
+ ret = -ENXIO;
+ goto probe_err2;
+ }
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ ret = irq;
+ goto probe_err3;
+ }
+
+ ret = request_irq(irq, pl330_irq_handler, 0,
+ dev_name(&pdev->dev), pl330_info);
+ if (ret)
+ goto probe_err4;
+
+ ret = pl330_add(pl330_info);
+ if (ret)
+ goto probe_err5;
+
+ /* Allocate a new DMAC */
+ s3c_pl330_dmac = kmalloc(sizeof(*s3c_pl330_dmac), GFP_KERNEL);
+ if (!s3c_pl330_dmac) {
+ ret = -ENOMEM;
+ goto probe_err6;
+ }
+
+ /* Hook the info */
+ s3c_pl330_dmac->pi = pl330_info;
+
+ /* No busy channels */
+ s3c_pl330_dmac->busy_chan = 0;
+
+ s3c_pl330_dmac->kmcache = kmem_cache_create(dev_name(&pdev->dev),
+ sizeof(struct s3c_pl330_xfer), 0, 0, NULL);
+
+ if (!s3c_pl330_dmac->kmcache) {
+ ret = -ENOMEM;
+ goto probe_err7;
+ }
+
+ /* Get the list of peripherals */
+ s3c_pl330_dmac->peri = pl330pd->peri;
+
+ /* Attach to the list of DMACs */
+ list_add_tail(&s3c_pl330_dmac->node, &dmac_list);
+
+ /* Create a channel for each peripheral in the DMAC
+ * that is, if it doesn't already exist
+ */
+ for (i = 0; i < PL330_MAX_PERI; i++)
+ if (s3c_pl330_dmac->peri[i] != DMACH_MAX)
+ chan_add(s3c_pl330_dmac->peri[i]);
+
+ printk(KERN_INFO
+ "Loaded driver for PL330 DMAC-%d %s\n", pdev->id, pdev->name);
+ printk(KERN_INFO
+ "\tDBUFF-%ux%ubytes Num_Chans-%u Num_Peri-%u Num_Events-%u\n",
+ pl330_info->pcfg.data_buf_dep,
+ pl330_info->pcfg.data_bus_width / 8, pl330_info->pcfg.num_chan,
+ pl330_info->pcfg.num_peri, pl330_info->pcfg.num_events);
+
+ return 0;
+
+probe_err7:
+ kfree(s3c_pl330_dmac);
+probe_err6:
+ pl330_del(pl330_info);
+probe_err5:
+ free_irq(irq, pl330_info);
+probe_err4:
+probe_err3:
+ iounmap(pl330_info->base);
+probe_err2:
+ release_mem_region(res->start, resource_size(res));
+probe_err1:
+ kfree(pl330_info);
+
+ return ret;
+}
+
+static int pl330_remove(struct platform_device *pdev)
+{
+ struct s3c_pl330_dmac *dmac, *d;
+ struct s3c_pl330_chan *ch;
+ unsigned long flags;
+ int del, found;
+
+ if (!pdev->dev.platform_data)
+ return -EINVAL;
+
+ spin_lock_irqsave(&res_lock, flags);
+
+ found = 0;
+ list_for_each_entry(d, &dmac_list, node)
+ if (d->pi->dev == &pdev->dev) {
+ found = 1;
+ break;
+ }
+
+ if (!found) {
+ spin_unlock_irqrestore(&res_lock, flags);
+ return 0;
+ }
+
+ dmac = d;
+
+ /* Remove all Channels that are managed only by this DMAC */
+ list_for_each_entry(ch, &chan_list, node) {
+
+ /* Only channels that are handled by this DMAC */
+ if (iface_of_dmac(dmac, ch->id))
+ del = 1;
+ else
+ continue;
+
+ /* Don't remove if some other DMAC has it too */
+ list_for_each_entry(d, &dmac_list, node)
+ if (d != dmac && iface_of_dmac(d, ch->id)) {
+ del = 0;
+ break;
+ }
+
+ if (del) {
+ spin_unlock_irqrestore(&res_lock, flags);
+ s3c2410_dma_free(ch->id, ch->client);
+ spin_lock_irqsave(&res_lock, flags);
+ list_del(&ch->node);
+ kfree(ch);
+ }
+ }
+
+ /* Remove the DMAC */
+ list_del(&dmac->node);
+ kfree(dmac);
+
+ spin_unlock_irqrestore(&res_lock, flags);
+
+ return 0;
+}
+
+static struct platform_driver pl330_driver = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "s3c-pl330",
+ },
+ .probe = pl330_probe,
+ .remove = pl330_remove,
+};
+
+static int __init pl330_init(void)
+{
+ return platform_driver_register(&pl330_driver);
+}
+module_init(pl330_init);
+
+static void __exit pl330_exit(void)
+{
+ platform_driver_unregister(&pl330_driver);
+ return;
+}
+module_exit(pl330_exit);
+
+MODULE_AUTHOR("Jaswinder Singh <jassi.brar@samsung.com>");
+MODULE_DESCRIPTION("Driver for PL330 DMA Controller");
+MODULE_LICENSE("GPL");
projects / GitHub / MotorolaMobilityLLC / kernel-slsi.git / commitdiff