+++ /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 <linux/clk.h>
-#include <linux/err.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.
- * @clk: Pointer of DMAC operation clock.
- */
-struct s3c_pl330_dmac {
- unsigned busy_chan;
- enum dma_ch *peri;
- struct list_head node;
- struct pl330_info *pi;
- struct kmem_cache *kmcache;
- struct clk *clk;
-};
-
-/**
- * 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 executed.
- * @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;
-
- /* Allocate a new DMAC */
- s3c_pl330_dmac = kmalloc(sizeof(*s3c_pl330_dmac), GFP_KERNEL);
- if (!s3c_pl330_dmac) {
- ret = -ENOMEM;
- goto probe_err5;
- }
-
- /* Get operation clock and enable it */
- s3c_pl330_dmac->clk = clk_get(&pdev->dev, "pdma");
- if (IS_ERR(s3c_pl330_dmac->clk)) {
- dev_err(&pdev->dev, "Cannot get operation clock.\n");
- ret = -EINVAL;
- goto probe_err6;
- }
- clk_enable(s3c_pl330_dmac->clk);
-
- ret = pl330_add(pl330_info);
- if (ret)
- goto probe_err7;
-
- /* 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_err8;
- }
-
- /* 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_err8:
- pl330_del(pl330_info);
-probe_err7:
- clk_disable(s3c_pl330_dmac->clk);
- clk_put(s3c_pl330_dmac->clk);
-probe_err6:
- kfree(s3c_pl330_dmac);
-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);
- }
- }
-
- /* Disable operation clock */
- clk_disable(dmac->clk);
- clk_put(dmac->clk);
-
- /* 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");
git.openpandora.org / pandora-kernel.git / commitdiff