+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * S3C24XX DMA handling
- *
- * Copyright (c) 2013 Heiko Stuebner <heiko@sntech.de>
- *
- * based on amba-pl08x.c
- *
- * Copyright (c) 2006 ARM Ltd.
- * Copyright (c) 2010 ST-Ericsson SA
- *
- * Author: Peter Pearse <peter.pearse@arm.com>
- * Author: Linus Walleij <linus.walleij@stericsson.com>
- *
- * The DMA controllers in S3C24XX SoCs have a varying number of DMA signals
- * that can be routed to any of the 4 to 8 hardware-channels.
- *
- * Therefore on these DMA controllers the number of channels
- * and the number of incoming DMA signals are two totally different things.
- * It is usually not possible to theoretically handle all physical signals,
- * so a multiplexing scheme with possible denial of use is necessary.
- *
- * Open items:
- * - bursts
- */
-
-#include <linux/platform_device.h>
-#include <linux/types.h>
-#include <linux/dmaengine.h>
-#include <linux/dma-mapping.h>
-#include <linux/interrupt.h>
-#include <linux/clk.h>
-#include <linux/module.h>
-#include <linux/mod_devicetable.h>
-#include <linux/slab.h>
-#include <linux/platform_data/dma-s3c24xx.h>
-
-#include "dmaengine.h"
-#include "virt-dma.h"
-
-#define MAX_DMA_CHANNELS 8
-
-#define S3C24XX_DISRC 0x00
-#define S3C24XX_DISRCC 0x04
-#define S3C24XX_DISRCC_INC_INCREMENT 0
-#define S3C24XX_DISRCC_INC_FIXED BIT(0)
-#define S3C24XX_DISRCC_LOC_AHB 0
-#define S3C24XX_DISRCC_LOC_APB BIT(1)
-
-#define S3C24XX_DIDST 0x08
-#define S3C24XX_DIDSTC 0x0c
-#define S3C24XX_DIDSTC_INC_INCREMENT 0
-#define S3C24XX_DIDSTC_INC_FIXED BIT(0)
-#define S3C24XX_DIDSTC_LOC_AHB 0
-#define S3C24XX_DIDSTC_LOC_APB BIT(1)
-#define S3C24XX_DIDSTC_INT_TC0 0
-#define S3C24XX_DIDSTC_INT_RELOAD BIT(2)
-
-#define S3C24XX_DCON 0x10
-
-#define S3C24XX_DCON_TC_MASK 0xfffff
-#define S3C24XX_DCON_DSZ_BYTE (0 << 20)
-#define S3C24XX_DCON_DSZ_HALFWORD (1 << 20)
-#define S3C24XX_DCON_DSZ_WORD (2 << 20)
-#define S3C24XX_DCON_DSZ_MASK (3 << 20)
-#define S3C24XX_DCON_DSZ_SHIFT 20
-#define S3C24XX_DCON_AUTORELOAD 0
-#define S3C24XX_DCON_NORELOAD BIT(22)
-#define S3C24XX_DCON_HWTRIG BIT(23)
-#define S3C24XX_DCON_HWSRC_SHIFT 24
-#define S3C24XX_DCON_SERV_SINGLE 0
-#define S3C24XX_DCON_SERV_WHOLE BIT(27)
-#define S3C24XX_DCON_TSZ_UNIT 0
-#define S3C24XX_DCON_TSZ_BURST4 BIT(28)
-#define S3C24XX_DCON_INT BIT(29)
-#define S3C24XX_DCON_SYNC_PCLK 0
-#define S3C24XX_DCON_SYNC_HCLK BIT(30)
-#define S3C24XX_DCON_DEMAND 0
-#define S3C24XX_DCON_HANDSHAKE BIT(31)
-
-#define S3C24XX_DSTAT 0x14
-#define S3C24XX_DSTAT_STAT_BUSY BIT(20)
-#define S3C24XX_DSTAT_CURRTC_MASK 0xfffff
-
-#define S3C24XX_DMASKTRIG 0x20
-#define S3C24XX_DMASKTRIG_SWTRIG BIT(0)
-#define S3C24XX_DMASKTRIG_ON BIT(1)
-#define S3C24XX_DMASKTRIG_STOP BIT(2)
-
-#define S3C24XX_DMAREQSEL 0x24
-#define S3C24XX_DMAREQSEL_HW BIT(0)
-
-/*
- * S3C2410, S3C2440 and S3C2442 SoCs cannot select any physical channel
- * for a DMA source. Instead only specific channels are valid.
- * All of these SoCs have 4 physical channels and the number of request
- * source bits is 3. Additionally we also need 1 bit to mark the channel
- * as valid.
- * Therefore we separate the chansel element of the channel data into 4
- * parts of 4 bits each, to hold the information if the channel is valid
- * and the hw request source to use.
- *
- * Example:
- * SDI is valid on channels 0, 2 and 3 - with varying hw request sources.
- * For it the chansel field would look like
- *
- * ((BIT(3) | 1) << 3 * 4) | // channel 3, with request source 1
- * ((BIT(3) | 2) << 2 * 4) | // channel 2, with request source 2
- * ((BIT(3) | 2) << 0 * 4) // channel 0, with request source 2
- */
-#define S3C24XX_CHANSEL_WIDTH 4
-#define S3C24XX_CHANSEL_VALID BIT(3)
-#define S3C24XX_CHANSEL_REQ_MASK 7
-
-/*
- * struct soc_data - vendor-specific config parameters for individual SoCs
- * @stride: spacing between the registers of each channel
- * @has_reqsel: does the controller use the newer requestselection mechanism
- * @has_clocks: are controllable dma-clocks present
- */
-struct soc_data {
- int stride;
- bool has_reqsel;
- bool has_clocks;
-};
-
-/*
- * enum s3c24xx_dma_chan_state - holds the virtual channel states
- * @S3C24XX_DMA_CHAN_IDLE: the channel is idle
- * @S3C24XX_DMA_CHAN_RUNNING: the channel has allocated a physical transport
- * channel and is running a transfer on it
- * @S3C24XX_DMA_CHAN_WAITING: the channel is waiting for a physical transport
- * channel to become available (only pertains to memcpy channels)
- */
-enum s3c24xx_dma_chan_state {
- S3C24XX_DMA_CHAN_IDLE,
- S3C24XX_DMA_CHAN_RUNNING,
- S3C24XX_DMA_CHAN_WAITING,
-};
-
-/*
- * struct s3c24xx_sg - structure containing data per sg
- * @src_addr: src address of sg
- * @dst_addr: dst address of sg
- * @len: transfer len in bytes
- * @node: node for txd's dsg_list
- */
-struct s3c24xx_sg {
- dma_addr_t src_addr;
- dma_addr_t dst_addr;
- size_t len;
- struct list_head node;
-};
-
-/*
- * struct s3c24xx_txd - wrapper for struct dma_async_tx_descriptor
- * @vd: virtual DMA descriptor
- * @dsg_list: list of children sg's
- * @at: sg currently being transfered
- * @width: transfer width
- * @disrcc: value for source control register
- * @didstc: value for destination control register
- * @dcon: base value for dcon register
- * @cyclic: indicate cyclic transfer
- */
-struct s3c24xx_txd {
- struct virt_dma_desc vd;
- struct list_head dsg_list;
- struct list_head *at;
- u8 width;
- u32 disrcc;
- u32 didstc;
- u32 dcon;
- bool cyclic;
-};
-
-struct s3c24xx_dma_chan;
-
-/*
- * struct s3c24xx_dma_phy - holder for the physical channels
- * @id: physical index to this channel
- * @valid: does the channel have all required elements
- * @base: virtual memory base (remapped) for the this channel
- * @irq: interrupt for this channel
- * @clk: clock for this channel
- * @lock: a lock to use when altering an instance of this struct
- * @serving: virtual channel currently being served by this physicalchannel
- * @host: a pointer to the host (internal use)
- */
-struct s3c24xx_dma_phy {
- unsigned int id;
- bool valid;
- void __iomem *base;
- int irq;
- struct clk *clk;
- spinlock_t lock;
- struct s3c24xx_dma_chan *serving;
- struct s3c24xx_dma_engine *host;
-};
-
-/*
- * struct s3c24xx_dma_chan - this structure wraps a DMA ENGINE channel
- * @id: the id of the channel
- * @name: name of the channel
- * @vc: wrapped virtual channel
- * @phy: the physical channel utilized by this channel, if there is one
- * @runtime_addr: address for RX/TX according to the runtime config
- * @at: active transaction on this channel
- * @lock: a lock for this channel data
- * @host: a pointer to the host (internal use)
- * @state: whether the channel is idle, running etc
- * @slave: whether this channel is a device (slave) or for memcpy
- */
-struct s3c24xx_dma_chan {
- int id;
- const char *name;
- struct virt_dma_chan vc;
- struct s3c24xx_dma_phy *phy;
- struct dma_slave_config cfg;
- struct s3c24xx_txd *at;
- struct s3c24xx_dma_engine *host;
- enum s3c24xx_dma_chan_state state;
- bool slave;
-};
-
-/*
- * struct s3c24xx_dma_engine - the local state holder for the S3C24XX
- * @pdev: the corresponding platform device
- * @pdata: platform data passed in from the platform/machine
- * @base: virtual memory base (remapped)
- * @slave: slave engine for this instance
- * @memcpy: memcpy engine for this instance
- * @phy_chans: array of data for the physical channels
- */
-struct s3c24xx_dma_engine {
- struct platform_device *pdev;
- const struct s3c24xx_dma_platdata *pdata;
- struct soc_data *sdata;
- void __iomem *base;
- struct dma_device slave;
- struct dma_device memcpy;
- struct s3c24xx_dma_phy *phy_chans;
-};
-
-/*
- * Physical channel handling
- */
-
-/*
- * Check whether a certain channel is busy or not.
- */
-static int s3c24xx_dma_phy_busy(struct s3c24xx_dma_phy *phy)
-{
- unsigned int val = readl(phy->base + S3C24XX_DSTAT);
- return val & S3C24XX_DSTAT_STAT_BUSY;
-}
-
-static bool s3c24xx_dma_phy_valid(struct s3c24xx_dma_chan *s3cchan,
- struct s3c24xx_dma_phy *phy)
-{
- struct s3c24xx_dma_engine *s3cdma = s3cchan->host;
- const struct s3c24xx_dma_platdata *pdata = s3cdma->pdata;
- struct s3c24xx_dma_channel *cdata = &pdata->channels[s3cchan->id];
- int phyvalid;
-
- /* every phy is valid for memcopy channels */
- if (!s3cchan->slave)
- return true;
-
- /* On newer variants all phys can be used for all virtual channels */
- if (s3cdma->sdata->has_reqsel)
- return true;
-
- phyvalid = (cdata->chansel >> (phy->id * S3C24XX_CHANSEL_WIDTH));
- return (phyvalid & S3C24XX_CHANSEL_VALID) ? true : false;
-}
-
-/*
- * Allocate a physical channel for a virtual channel
- *
- * Try to locate a physical channel to be used for this transfer. If all
- * are taken return NULL and the requester will have to cope by using
- * some fallback PIO mode or retrying later.
- */
-static
-struct s3c24xx_dma_phy *s3c24xx_dma_get_phy(struct s3c24xx_dma_chan *s3cchan)
-{
- struct s3c24xx_dma_engine *s3cdma = s3cchan->host;
- struct s3c24xx_dma_phy *phy = NULL;
- unsigned long flags;
- int i;
- int ret;
-
- for (i = 0; i < s3cdma->pdata->num_phy_channels; i++) {
- phy = &s3cdma->phy_chans[i];
-
- if (!phy->valid)
- continue;
-
- if (!s3c24xx_dma_phy_valid(s3cchan, phy))
- continue;
-
- spin_lock_irqsave(&phy->lock, flags);
-
- if (!phy->serving) {
- phy->serving = s3cchan;
- spin_unlock_irqrestore(&phy->lock, flags);
- break;
- }
-
- spin_unlock_irqrestore(&phy->lock, flags);
- }
-
- /* No physical channel available, cope with it */
- if (i == s3cdma->pdata->num_phy_channels) {
- dev_warn(&s3cdma->pdev->dev, "no phy channel available\n");
- return NULL;
- }
-
- /* start the phy clock */
- if (s3cdma->sdata->has_clocks) {
- ret = clk_enable(phy->clk);
- if (ret) {
- dev_err(&s3cdma->pdev->dev, "could not enable clock for channel %d, err %d\n",
- phy->id, ret);
- phy->serving = NULL;
- return NULL;
- }
- }
-
- return phy;
-}
-
-/*
- * Mark the physical channel as free.
- *
- * This drops the link between the physical and virtual channel.
- */
-static inline void s3c24xx_dma_put_phy(struct s3c24xx_dma_phy *phy)
-{
- struct s3c24xx_dma_engine *s3cdma = phy->host;
-
- if (s3cdma->sdata->has_clocks)
- clk_disable(phy->clk);
-
- phy->serving = NULL;
-}
-
-/*
- * Stops the channel by writing the stop bit.
- * This should not be used for an on-going transfer, but as a method of
- * shutting down a channel (eg, when it's no longer used) or terminating a
- * transfer.
- */
-static void s3c24xx_dma_terminate_phy(struct s3c24xx_dma_phy *phy)
-{
- writel(S3C24XX_DMASKTRIG_STOP, phy->base + S3C24XX_DMASKTRIG);
-}
-
-/*
- * Virtual channel handling
- */
-
-static inline
-struct s3c24xx_dma_chan *to_s3c24xx_dma_chan(struct dma_chan *chan)
-{
- return container_of(chan, struct s3c24xx_dma_chan, vc.chan);
-}
-
-static u32 s3c24xx_dma_getbytes_chan(struct s3c24xx_dma_chan *s3cchan)
-{
- struct s3c24xx_dma_phy *phy = s3cchan->phy;
- struct s3c24xx_txd *txd = s3cchan->at;
- u32 tc = readl(phy->base + S3C24XX_DSTAT) & S3C24XX_DSTAT_CURRTC_MASK;
-
- return tc * txd->width;
-}
-
-static int s3c24xx_dma_set_runtime_config(struct dma_chan *chan,
- struct dma_slave_config *config)
-{
- struct s3c24xx_dma_chan *s3cchan = to_s3c24xx_dma_chan(chan);
- unsigned long flags;
- int ret = 0;
-
- /* Reject definitely invalid configurations */
- if (config->src_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES ||
- config->dst_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES)
- return -EINVAL;
-
- spin_lock_irqsave(&s3cchan->vc.lock, flags);
-
- if (!s3cchan->slave) {
- ret = -EINVAL;
- goto out;
- }
-
- s3cchan->cfg = *config;
-
-out:
- spin_unlock_irqrestore(&s3cchan->vc.lock, flags);
- return ret;
-}
-
-/*
- * Transfer handling
- */
-
-static inline
-struct s3c24xx_txd *to_s3c24xx_txd(struct dma_async_tx_descriptor *tx)
-{
- return container_of(tx, struct s3c24xx_txd, vd.tx);
-}
-
-static struct s3c24xx_txd *s3c24xx_dma_get_txd(void)
-{
- struct s3c24xx_txd *txd = kzalloc(sizeof(*txd), GFP_NOWAIT);
-
- if (txd) {
- INIT_LIST_HEAD(&txd->dsg_list);
- txd->dcon = S3C24XX_DCON_INT | S3C24XX_DCON_NORELOAD;
- }
-
- return txd;
-}
-
-static void s3c24xx_dma_free_txd(struct s3c24xx_txd *txd)
-{
- struct s3c24xx_sg *dsg, *_dsg;
-
- list_for_each_entry_safe(dsg, _dsg, &txd->dsg_list, node) {
- list_del(&dsg->node);
- kfree(dsg);
- }
-
- kfree(txd);
-}
-
-static void s3c24xx_dma_start_next_sg(struct s3c24xx_dma_chan *s3cchan,
- struct s3c24xx_txd *txd)
-{
- struct s3c24xx_dma_engine *s3cdma = s3cchan->host;
- struct s3c24xx_dma_phy *phy = s3cchan->phy;
- const struct s3c24xx_dma_platdata *pdata = s3cdma->pdata;
- struct s3c24xx_sg *dsg = list_entry(txd->at, struct s3c24xx_sg, node);
- u32 dcon = txd->dcon;
- u32 val;
-
- /* transfer-size and -count from len and width */
- switch (txd->width) {
- case 1:
- dcon |= S3C24XX_DCON_DSZ_BYTE | dsg->len;
- break;
- case 2:
- dcon |= S3C24XX_DCON_DSZ_HALFWORD | (dsg->len / 2);
- break;
- case 4:
- dcon |= S3C24XX_DCON_DSZ_WORD | (dsg->len / 4);
- break;
- }
-
- if (s3cchan->slave) {
- struct s3c24xx_dma_channel *cdata =
- &pdata->channels[s3cchan->id];
-
- if (s3cdma->sdata->has_reqsel) {
- writel_relaxed((cdata->chansel << 1) |
- S3C24XX_DMAREQSEL_HW,
- phy->base + S3C24XX_DMAREQSEL);
- } else {
- int csel = cdata->chansel >> (phy->id *
- S3C24XX_CHANSEL_WIDTH);
-
- csel &= S3C24XX_CHANSEL_REQ_MASK;
- dcon |= csel << S3C24XX_DCON_HWSRC_SHIFT;
- dcon |= S3C24XX_DCON_HWTRIG;
- }
- } else {
- if (s3cdma->sdata->has_reqsel)
- writel_relaxed(0, phy->base + S3C24XX_DMAREQSEL);
- }
-
- writel_relaxed(dsg->src_addr, phy->base + S3C24XX_DISRC);
- writel_relaxed(txd->disrcc, phy->base + S3C24XX_DISRCC);
- writel_relaxed(dsg->dst_addr, phy->base + S3C24XX_DIDST);
- writel_relaxed(txd->didstc, phy->base + S3C24XX_DIDSTC);
- writel_relaxed(dcon, phy->base + S3C24XX_DCON);
-
- val = readl_relaxed(phy->base + S3C24XX_DMASKTRIG);
- val &= ~S3C24XX_DMASKTRIG_STOP;
- val |= S3C24XX_DMASKTRIG_ON;
-
- /* trigger the dma operation for memcpy transfers */
- if (!s3cchan->slave)
- val |= S3C24XX_DMASKTRIG_SWTRIG;
-
- writel(val, phy->base + S3C24XX_DMASKTRIG);
-}
-
-/*
- * Set the initial DMA register values and start first sg.
- */
-static void s3c24xx_dma_start_next_txd(struct s3c24xx_dma_chan *s3cchan)
-{
- struct s3c24xx_dma_phy *phy = s3cchan->phy;
- struct virt_dma_desc *vd = vchan_next_desc(&s3cchan->vc);
- struct s3c24xx_txd *txd = to_s3c24xx_txd(&vd->tx);
-
- list_del(&txd->vd.node);
-
- s3cchan->at = txd;
-
- /* Wait for channel inactive */
- while (s3c24xx_dma_phy_busy(phy))
- cpu_relax();
-
- /* point to the first element of the sg list */
- txd->at = txd->dsg_list.next;
- s3c24xx_dma_start_next_sg(s3cchan, txd);
-}
-
-/*
- * Try to allocate a physical channel. When successful, assign it to
- * this virtual channel, and initiate the next descriptor. The
- * virtual channel lock must be held at this point.
- */
-static void s3c24xx_dma_phy_alloc_and_start(struct s3c24xx_dma_chan *s3cchan)
-{
- struct s3c24xx_dma_engine *s3cdma = s3cchan->host;
- struct s3c24xx_dma_phy *phy;
-
- phy = s3c24xx_dma_get_phy(s3cchan);
- if (!phy) {
- dev_dbg(&s3cdma->pdev->dev, "no physical channel available for xfer on %s\n",
- s3cchan->name);
- s3cchan->state = S3C24XX_DMA_CHAN_WAITING;
- return;
- }
-
- dev_dbg(&s3cdma->pdev->dev, "allocated physical channel %d for xfer on %s\n",
- phy->id, s3cchan->name);
-
- s3cchan->phy = phy;
- s3cchan->state = S3C24XX_DMA_CHAN_RUNNING;
-
- s3c24xx_dma_start_next_txd(s3cchan);
-}
-
-static void s3c24xx_dma_phy_reassign_start(struct s3c24xx_dma_phy *phy,
- struct s3c24xx_dma_chan *s3cchan)
-{
- struct s3c24xx_dma_engine *s3cdma = s3cchan->host;
-
- dev_dbg(&s3cdma->pdev->dev, "reassigned physical channel %d for xfer on %s\n",
- phy->id, s3cchan->name);
-
- /*
- * We do this without taking the lock; we're really only concerned
- * about whether this pointer is NULL or not, and we're guaranteed
- * that this will only be called when it _already_ is non-NULL.
- */
- phy->serving = s3cchan;
- s3cchan->phy = phy;
- s3cchan->state = S3C24XX_DMA_CHAN_RUNNING;
- s3c24xx_dma_start_next_txd(s3cchan);
-}
-
-/*
- * Free a physical DMA channel, potentially reallocating it to another
- * virtual channel if we have any pending.
- */
-static void s3c24xx_dma_phy_free(struct s3c24xx_dma_chan *s3cchan)
-{
- struct s3c24xx_dma_engine *s3cdma = s3cchan->host;
- struct s3c24xx_dma_chan *p, *next;
-
-retry:
- next = NULL;
-
- /* Find a waiting virtual channel for the next transfer. */
- list_for_each_entry(p, &s3cdma->memcpy.channels, vc.chan.device_node)
- if (p->state == S3C24XX_DMA_CHAN_WAITING) {
- next = p;
- break;
- }
-
- if (!next) {
- list_for_each_entry(p, &s3cdma->slave.channels,
- vc.chan.device_node)
- if (p->state == S3C24XX_DMA_CHAN_WAITING &&
- s3c24xx_dma_phy_valid(p, s3cchan->phy)) {
- next = p;
- break;
- }
- }
-
- /* Ensure that the physical channel is stopped */
- s3c24xx_dma_terminate_phy(s3cchan->phy);
-
- if (next) {
- bool success;
-
- /*
- * Eww. We know this isn't going to deadlock
- * but lockdep probably doesn't.
- */
- spin_lock(&next->vc.lock);
- /* Re-check the state now that we have the lock */
- success = next->state == S3C24XX_DMA_CHAN_WAITING;
- if (success)
- s3c24xx_dma_phy_reassign_start(s3cchan->phy, next);
- spin_unlock(&next->vc.lock);
-
- /* If the state changed, try to find another channel */
- if (!success)
- goto retry;
- } else {
- /* No more jobs, so free up the physical channel */
- s3c24xx_dma_put_phy(s3cchan->phy);
- }
-
- s3cchan->phy = NULL;
- s3cchan->state = S3C24XX_DMA_CHAN_IDLE;
-}
-
-static void s3c24xx_dma_desc_free(struct virt_dma_desc *vd)
-{
- struct s3c24xx_txd *txd = to_s3c24xx_txd(&vd->tx);
- struct s3c24xx_dma_chan *s3cchan = to_s3c24xx_dma_chan(vd->tx.chan);
-
- if (!s3cchan->slave)
- dma_descriptor_unmap(&vd->tx);
-
- s3c24xx_dma_free_txd(txd);
-}
-
-static irqreturn_t s3c24xx_dma_irq(int irq, void *data)
-{
- struct s3c24xx_dma_phy *phy = data;
- struct s3c24xx_dma_chan *s3cchan = phy->serving;
- struct s3c24xx_txd *txd;
-
- dev_dbg(&phy->host->pdev->dev, "interrupt on channel %d\n", phy->id);
-
- /*
- * Interrupts happen to notify the completion of a transfer and the
- * channel should have moved into its stop state already on its own.
- * Therefore interrupts on channels not bound to a virtual channel
- * should never happen. Nevertheless send a terminate command to the
- * channel if the unlikely case happens.
- */
- if (unlikely(!s3cchan)) {
- dev_err(&phy->host->pdev->dev, "interrupt on unused channel %d\n",
- phy->id);
-
- s3c24xx_dma_terminate_phy(phy);
-
- return IRQ_HANDLED;
- }
-
- spin_lock(&s3cchan->vc.lock);
- txd = s3cchan->at;
- if (txd) {
- /* when more sg's are in this txd, start the next one */
- if (!list_is_last(txd->at, &txd->dsg_list)) {
- txd->at = txd->at->next;
- if (txd->cyclic)
- vchan_cyclic_callback(&txd->vd);
- s3c24xx_dma_start_next_sg(s3cchan, txd);
- } else if (!txd->cyclic) {
- s3cchan->at = NULL;
- vchan_cookie_complete(&txd->vd);
-
- /*
- * And start the next descriptor (if any),
- * otherwise free this channel.
- */
- if (vchan_next_desc(&s3cchan->vc))
- s3c24xx_dma_start_next_txd(s3cchan);
- else
- s3c24xx_dma_phy_free(s3cchan);
- } else {
- vchan_cyclic_callback(&txd->vd);
-
- /* Cyclic: reset at beginning */
- txd->at = txd->dsg_list.next;
- s3c24xx_dma_start_next_sg(s3cchan, txd);
- }
- }
- spin_unlock(&s3cchan->vc.lock);
-
- return IRQ_HANDLED;
-}
-
-/*
- * The DMA ENGINE API
- */
-
-static int s3c24xx_dma_terminate_all(struct dma_chan *chan)
-{
- struct s3c24xx_dma_chan *s3cchan = to_s3c24xx_dma_chan(chan);
- struct s3c24xx_dma_engine *s3cdma = s3cchan->host;
- LIST_HEAD(head);
- unsigned long flags;
- int ret;
-
- spin_lock_irqsave(&s3cchan->vc.lock, flags);
-
- if (!s3cchan->phy && !s3cchan->at) {
- dev_err(&s3cdma->pdev->dev, "trying to terminate already stopped channel %d\n",
- s3cchan->id);
- ret = -EINVAL;
- goto unlock;
- }
-
- s3cchan->state = S3C24XX_DMA_CHAN_IDLE;
-
- /* Mark physical channel as free */
- if (s3cchan->phy)
- s3c24xx_dma_phy_free(s3cchan);
-
- /* Dequeue current job */
- if (s3cchan->at) {
- vchan_terminate_vdesc(&s3cchan->at->vd);
- s3cchan->at = NULL;
- }
-
- /* Dequeue jobs not yet fired as well */
-
- vchan_get_all_descriptors(&s3cchan->vc, &head);
-
- spin_unlock_irqrestore(&s3cchan->vc.lock, flags);
-
- vchan_dma_desc_free_list(&s3cchan->vc, &head);
-
- return 0;
-
-unlock:
- spin_unlock_irqrestore(&s3cchan->vc.lock, flags);
-
- return ret;
-}
-
-static void s3c24xx_dma_synchronize(struct dma_chan *chan)
-{
- struct s3c24xx_dma_chan *s3cchan = to_s3c24xx_dma_chan(chan);
-
- vchan_synchronize(&s3cchan->vc);
-}
-
-static void s3c24xx_dma_free_chan_resources(struct dma_chan *chan)
-{
- /* Ensure all queued descriptors are freed */
- vchan_free_chan_resources(to_virt_chan(chan));
-}
-
-static enum dma_status s3c24xx_dma_tx_status(struct dma_chan *chan,
- dma_cookie_t cookie, struct dma_tx_state *txstate)
-{
- struct s3c24xx_dma_chan *s3cchan = to_s3c24xx_dma_chan(chan);
- struct s3c24xx_txd *txd;
- struct s3c24xx_sg *dsg;
- struct virt_dma_desc *vd;
- unsigned long flags;
- enum dma_status ret;
- size_t bytes = 0;
-
- spin_lock_irqsave(&s3cchan->vc.lock, flags);
- ret = dma_cookie_status(chan, cookie, txstate);
-
- /*
- * There's no point calculating the residue if there's
- * no txstate to store the value.
- */
- if (ret == DMA_COMPLETE || !txstate) {
- spin_unlock_irqrestore(&s3cchan->vc.lock, flags);
- return ret;
- }
-
- vd = vchan_find_desc(&s3cchan->vc, cookie);
- if (vd) {
- /* On the issued list, so hasn't been processed yet */
- txd = to_s3c24xx_txd(&vd->tx);
-
- list_for_each_entry(dsg, &txd->dsg_list, node)
- bytes += dsg->len;
- } else {
- /*
- * Currently running, so sum over the pending sg's and
- * the currently active one.
- */
- txd = s3cchan->at;
-
- dsg = list_entry(txd->at, struct s3c24xx_sg, node);
- list_for_each_entry_from(dsg, &txd->dsg_list, node)
- bytes += dsg->len;
-
- bytes += s3c24xx_dma_getbytes_chan(s3cchan);
- }
- spin_unlock_irqrestore(&s3cchan->vc.lock, flags);
-
- /*
- * This cookie not complete yet
- * Get number of bytes left in the active transactions and queue
- */
- dma_set_residue(txstate, bytes);
-
- /* Whether waiting or running, we're in progress */
- return ret;
-}
-
-/*
- * Initialize a descriptor to be used by memcpy submit
- */
-static struct dma_async_tx_descriptor *s3c24xx_dma_prep_memcpy(
- struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
- size_t len, unsigned long flags)
-{
- struct s3c24xx_dma_chan *s3cchan = to_s3c24xx_dma_chan(chan);
- struct s3c24xx_dma_engine *s3cdma = s3cchan->host;
- struct s3c24xx_txd *txd;
- struct s3c24xx_sg *dsg;
- int src_mod, dest_mod;
-
- dev_dbg(&s3cdma->pdev->dev, "prepare memcpy of %zu bytes from %s\n",
- len, s3cchan->name);
-
- if ((len & S3C24XX_DCON_TC_MASK) != len) {
- dev_err(&s3cdma->pdev->dev, "memcpy size %zu to large\n", len);
- return NULL;
- }
-
- txd = s3c24xx_dma_get_txd();
- if (!txd)
- return NULL;
-
- dsg = kzalloc(sizeof(*dsg), GFP_NOWAIT);
- if (!dsg) {
- s3c24xx_dma_free_txd(txd);
- return NULL;
- }
- list_add_tail(&dsg->node, &txd->dsg_list);
-
- dsg->src_addr = src;
- dsg->dst_addr = dest;
- dsg->len = len;
-
- /*
- * Determine a suitable transfer width.
- * The DMA controller cannot fetch/store information which is not
- * naturally aligned on the bus, i.e., a 4 byte fetch must start at
- * an address divisible by 4 - more generally addr % width must be 0.
- */
- src_mod = src % 4;
- dest_mod = dest % 4;
- switch (len % 4) {
- case 0:
- txd->width = (src_mod == 0 && dest_mod == 0) ? 4 : 1;
- break;
- case 2:
- txd->width = ((src_mod == 2 || src_mod == 0) &&
- (dest_mod == 2 || dest_mod == 0)) ? 2 : 1;
- break;
- default:
- txd->width = 1;
- break;
- }
-
- txd->disrcc = S3C24XX_DISRCC_LOC_AHB | S3C24XX_DISRCC_INC_INCREMENT;
- txd->didstc = S3C24XX_DIDSTC_LOC_AHB | S3C24XX_DIDSTC_INC_INCREMENT;
- txd->dcon |= S3C24XX_DCON_DEMAND | S3C24XX_DCON_SYNC_HCLK |
- S3C24XX_DCON_SERV_WHOLE;
-
- return vchan_tx_prep(&s3cchan->vc, &txd->vd, flags);
-}
-
-static struct dma_async_tx_descriptor *s3c24xx_dma_prep_dma_cyclic(
- struct dma_chan *chan, dma_addr_t addr, size_t size, size_t period,
- enum dma_transfer_direction direction, unsigned long flags)
-{
- struct s3c24xx_dma_chan *s3cchan = to_s3c24xx_dma_chan(chan);
- struct s3c24xx_dma_engine *s3cdma = s3cchan->host;
- const struct s3c24xx_dma_platdata *pdata = s3cdma->pdata;
- struct s3c24xx_dma_channel *cdata = &pdata->channels[s3cchan->id];
- struct s3c24xx_txd *txd;
- struct s3c24xx_sg *dsg;
- unsigned sg_len;
- dma_addr_t slave_addr;
- u32 hwcfg = 0;
- int i;
-
- dev_dbg(&s3cdma->pdev->dev,
- "prepare cyclic transaction of %zu bytes with period %zu from %s\n",
- size, period, s3cchan->name);
-
- if (!is_slave_direction(direction)) {
- dev_err(&s3cdma->pdev->dev,
- "direction %d unsupported\n", direction);
- return NULL;
- }
-
- txd = s3c24xx_dma_get_txd();
- if (!txd)
- return NULL;
-
- txd->cyclic = 1;
-
- if (cdata->handshake)
- txd->dcon |= S3C24XX_DCON_HANDSHAKE;
-
- switch (cdata->bus) {
- case S3C24XX_DMA_APB:
- txd->dcon |= S3C24XX_DCON_SYNC_PCLK;
- hwcfg |= S3C24XX_DISRCC_LOC_APB;
- break;
- case S3C24XX_DMA_AHB:
- txd->dcon |= S3C24XX_DCON_SYNC_HCLK;
- hwcfg |= S3C24XX_DISRCC_LOC_AHB;
- break;
- }
-
- /*
- * Always assume our peripheral desintation is a fixed
- * address in memory.
- */
- hwcfg |= S3C24XX_DISRCC_INC_FIXED;
-
- /*
- * Individual dma operations are requested by the slave,
- * so serve only single atomic operations (S3C24XX_DCON_SERV_SINGLE).
- */
- txd->dcon |= S3C24XX_DCON_SERV_SINGLE;
-
- if (direction == DMA_MEM_TO_DEV) {
- txd->disrcc = S3C24XX_DISRCC_LOC_AHB |
- S3C24XX_DISRCC_INC_INCREMENT;
- txd->didstc = hwcfg;
- slave_addr = s3cchan->cfg.dst_addr;
- txd->width = s3cchan->cfg.dst_addr_width;
- } else {
- txd->disrcc = hwcfg;
- txd->didstc = S3C24XX_DIDSTC_LOC_AHB |
- S3C24XX_DIDSTC_INC_INCREMENT;
- slave_addr = s3cchan->cfg.src_addr;
- txd->width = s3cchan->cfg.src_addr_width;
- }
-
- sg_len = size / period;
-
- for (i = 0; i < sg_len; i++) {
- dsg = kzalloc(sizeof(*dsg), GFP_NOWAIT);
- if (!dsg) {
- s3c24xx_dma_free_txd(txd);
- return NULL;
- }
- list_add_tail(&dsg->node, &txd->dsg_list);
-
- dsg->len = period;
- /* Check last period length */
- if (i == sg_len - 1)
- dsg->len = size - period * i;
- if (direction == DMA_MEM_TO_DEV) {
- dsg->src_addr = addr + period * i;
- dsg->dst_addr = slave_addr;
- } else { /* DMA_DEV_TO_MEM */
- dsg->src_addr = slave_addr;
- dsg->dst_addr = addr + period * i;
- }
- }
-
- return vchan_tx_prep(&s3cchan->vc, &txd->vd, flags);
-}
-
-static struct dma_async_tx_descriptor *s3c24xx_dma_prep_slave_sg(
- struct dma_chan *chan, struct scatterlist *sgl,
- unsigned int sg_len, enum dma_transfer_direction direction,
- unsigned long flags, void *context)
-{
- struct s3c24xx_dma_chan *s3cchan = to_s3c24xx_dma_chan(chan);
- struct s3c24xx_dma_engine *s3cdma = s3cchan->host;
- const struct s3c24xx_dma_platdata *pdata = s3cdma->pdata;
- struct s3c24xx_dma_channel *cdata = &pdata->channels[s3cchan->id];
- struct s3c24xx_txd *txd;
- struct s3c24xx_sg *dsg;
- struct scatterlist *sg;
- dma_addr_t slave_addr;
- u32 hwcfg = 0;
- int tmp;
-
- dev_dbg(&s3cdma->pdev->dev, "prepare transaction of %d bytes from %s\n",
- sg_dma_len(sgl), s3cchan->name);
-
- txd = s3c24xx_dma_get_txd();
- if (!txd)
- return NULL;
-
- if (cdata->handshake)
- txd->dcon |= S3C24XX_DCON_HANDSHAKE;
-
- switch (cdata->bus) {
- case S3C24XX_DMA_APB:
- txd->dcon |= S3C24XX_DCON_SYNC_PCLK;
- hwcfg |= S3C24XX_DISRCC_LOC_APB;
- break;
- case S3C24XX_DMA_AHB:
- txd->dcon |= S3C24XX_DCON_SYNC_HCLK;
- hwcfg |= S3C24XX_DISRCC_LOC_AHB;
- break;
- }
-
- /*
- * Always assume our peripheral desintation is a fixed
- * address in memory.
- */
- hwcfg |= S3C24XX_DISRCC_INC_FIXED;
-
- /*
- * Individual dma operations are requested by the slave,
- * so serve only single atomic operations (S3C24XX_DCON_SERV_SINGLE).
- */
- txd->dcon |= S3C24XX_DCON_SERV_SINGLE;
-
- if (direction == DMA_MEM_TO_DEV) {
- txd->disrcc = S3C24XX_DISRCC_LOC_AHB |
- S3C24XX_DISRCC_INC_INCREMENT;
- txd->didstc = hwcfg;
- slave_addr = s3cchan->cfg.dst_addr;
- txd->width = s3cchan->cfg.dst_addr_width;
- } else if (direction == DMA_DEV_TO_MEM) {
- txd->disrcc = hwcfg;
- txd->didstc = S3C24XX_DIDSTC_LOC_AHB |
- S3C24XX_DIDSTC_INC_INCREMENT;
- slave_addr = s3cchan->cfg.src_addr;
- txd->width = s3cchan->cfg.src_addr_width;
- } else {
- s3c24xx_dma_free_txd(txd);
- dev_err(&s3cdma->pdev->dev,
- "direction %d unsupported\n", direction);
- return NULL;
- }
-
- for_each_sg(sgl, sg, sg_len, tmp) {
- dsg = kzalloc(sizeof(*dsg), GFP_NOWAIT);
- if (!dsg) {
- s3c24xx_dma_free_txd(txd);
- return NULL;
- }
- list_add_tail(&dsg->node, &txd->dsg_list);
-
- dsg->len = sg_dma_len(sg);
- if (direction == DMA_MEM_TO_DEV) {
- dsg->src_addr = sg_dma_address(sg);
- dsg->dst_addr = slave_addr;
- } else { /* DMA_DEV_TO_MEM */
- dsg->src_addr = slave_addr;
- dsg->dst_addr = sg_dma_address(sg);
- }
- }
-
- return vchan_tx_prep(&s3cchan->vc, &txd->vd, flags);
-}
-
-/*
- * Slave transactions callback to the slave device to allow
- * synchronization of slave DMA signals with the DMAC enable
- */
-static void s3c24xx_dma_issue_pending(struct dma_chan *chan)
-{
- struct s3c24xx_dma_chan *s3cchan = to_s3c24xx_dma_chan(chan);
- unsigned long flags;
-
- spin_lock_irqsave(&s3cchan->vc.lock, flags);
- if (vchan_issue_pending(&s3cchan->vc)) {
- if (!s3cchan->phy && s3cchan->state != S3C24XX_DMA_CHAN_WAITING)
- s3c24xx_dma_phy_alloc_and_start(s3cchan);
- }
- spin_unlock_irqrestore(&s3cchan->vc.lock, flags);
-}
-
-/*
- * Bringup and teardown
- */
-
-/*
- * Initialise the DMAC memcpy/slave channels.
- * Make a local wrapper to hold required data
- */
-static int s3c24xx_dma_init_virtual_channels(struct s3c24xx_dma_engine *s3cdma,
- struct dma_device *dmadev, unsigned int channels, bool slave)
-{
- struct s3c24xx_dma_chan *chan;
- int i;
-
- INIT_LIST_HEAD(&dmadev->channels);
-
- /*
- * Register as many memcpy as we have physical channels,
- * we won't always be able to use all but the code will have
- * to cope with that situation.
- */
- for (i = 0; i < channels; i++) {
- chan = devm_kzalloc(dmadev->dev, sizeof(*chan), GFP_KERNEL);
- if (!chan)
- return -ENOMEM;
-
- chan->id = i;
- chan->host = s3cdma;
- chan->state = S3C24XX_DMA_CHAN_IDLE;
-
- if (slave) {
- chan->slave = true;
- chan->name = kasprintf(GFP_KERNEL, "slave%d", i);
- if (!chan->name)
- return -ENOMEM;
- } else {
- chan->name = kasprintf(GFP_KERNEL, "memcpy%d", i);
- if (!chan->name)
- return -ENOMEM;
- }
- dev_dbg(dmadev->dev,
- "initialize virtual channel \"%s\"\n",
- chan->name);
-
- chan->vc.desc_free = s3c24xx_dma_desc_free;
- vchan_init(&chan->vc, dmadev);
- }
- dev_info(dmadev->dev, "initialized %d virtual %s channels\n",
- i, slave ? "slave" : "memcpy");
- return i;
-}
-
-static void s3c24xx_dma_free_virtual_channels(struct dma_device *dmadev)
-{
- struct s3c24xx_dma_chan *chan = NULL;
- struct s3c24xx_dma_chan *next;
-
- list_for_each_entry_safe(chan,
- next, &dmadev->channels, vc.chan.device_node) {
- list_del(&chan->vc.chan.device_node);
- tasklet_kill(&chan->vc.task);
- }
-}
-
-/* s3c2410, s3c2440 and s3c2442 have a 0x40 stride without separate clocks */
-static struct soc_data soc_s3c2410 = {
- .stride = 0x40,
- .has_reqsel = false,
- .has_clocks = false,
-};
-
-/* s3c2412 and s3c2413 have a 0x40 stride and dmareqsel mechanism */
-static struct soc_data soc_s3c2412 = {
- .stride = 0x40,
- .has_reqsel = true,
- .has_clocks = true,
-};
-
-/* s3c2443 and following have a 0x100 stride and dmareqsel mechanism */
-static struct soc_data soc_s3c2443 = {
- .stride = 0x100,
- .has_reqsel = true,
- .has_clocks = true,
-};
-
-static const struct platform_device_id s3c24xx_dma_driver_ids[] = {
- {
- .name = "s3c2410-dma",
- .driver_data = (kernel_ulong_t)&soc_s3c2410,
- }, {
- .name = "s3c2412-dma",
- .driver_data = (kernel_ulong_t)&soc_s3c2412,
- }, {
- .name = "s3c2443-dma",
- .driver_data = (kernel_ulong_t)&soc_s3c2443,
- },
- { },
-};
-
-static struct soc_data *s3c24xx_dma_get_soc_data(struct platform_device *pdev)
-{
- return (struct soc_data *)
- platform_get_device_id(pdev)->driver_data;
-}
-
-static int s3c24xx_dma_probe(struct platform_device *pdev)
-{
- const struct s3c24xx_dma_platdata *pdata = dev_get_platdata(&pdev->dev);
- struct s3c24xx_dma_engine *s3cdma;
- struct soc_data *sdata;
- struct resource *res;
- int ret;
- int i;
-
- if (!pdata) {
- dev_err(&pdev->dev, "platform data missing\n");
- return -ENODEV;
- }
-
- /* Basic sanity check */
- if (pdata->num_phy_channels > MAX_DMA_CHANNELS) {
- dev_err(&pdev->dev, "too many dma channels %d, max %d\n",
- pdata->num_phy_channels, MAX_DMA_CHANNELS);
- return -EINVAL;
- }
-
- sdata = s3c24xx_dma_get_soc_data(pdev);
- if (!sdata)
- return -EINVAL;
-
- s3cdma = devm_kzalloc(&pdev->dev, sizeof(*s3cdma), GFP_KERNEL);
- if (!s3cdma)
- return -ENOMEM;
-
- s3cdma->pdev = pdev;
- s3cdma->pdata = pdata;
- s3cdma->sdata = sdata;
-
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- s3cdma->base = devm_ioremap_resource(&pdev->dev, res);
- if (IS_ERR(s3cdma->base))
- return PTR_ERR(s3cdma->base);
-
- s3cdma->phy_chans = devm_kcalloc(&pdev->dev,
- pdata->num_phy_channels,
- sizeof(struct s3c24xx_dma_phy),
- GFP_KERNEL);
- if (!s3cdma->phy_chans)
- return -ENOMEM;
-
- /* acquire irqs and clocks for all physical channels */
- for (i = 0; i < pdata->num_phy_channels; i++) {
- struct s3c24xx_dma_phy *phy = &s3cdma->phy_chans[i];
- char clk_name[6];
-
- phy->id = i;
- phy->base = s3cdma->base + (i * sdata->stride);
- phy->host = s3cdma;
-
- phy->irq = platform_get_irq(pdev, i);
- if (phy->irq < 0)
- continue;
-
- ret = devm_request_irq(&pdev->dev, phy->irq, s3c24xx_dma_irq,
- 0, pdev->name, phy);
- if (ret) {
- dev_err(&pdev->dev, "Unable to request irq for channel %d, error %d\n",
- i, ret);
- continue;
- }
-
- if (sdata->has_clocks) {
- sprintf(clk_name, "dma.%d", i);
- phy->clk = devm_clk_get(&pdev->dev, clk_name);
- if (IS_ERR(phy->clk) && sdata->has_clocks) {
- dev_err(&pdev->dev, "unable to acquire clock for channel %d, error %lu\n",
- i, PTR_ERR(phy->clk));
- continue;
- }
-
- ret = clk_prepare(phy->clk);
- if (ret) {
- dev_err(&pdev->dev, "clock for phy %d failed, error %d\n",
- i, ret);
- continue;
- }
- }
-
- spin_lock_init(&phy->lock);
- phy->valid = true;
-
- dev_dbg(&pdev->dev, "physical channel %d is %s\n",
- i, s3c24xx_dma_phy_busy(phy) ? "BUSY" : "FREE");
- }
-
- /* Initialize memcpy engine */
- dma_cap_set(DMA_MEMCPY, s3cdma->memcpy.cap_mask);
- dma_cap_set(DMA_PRIVATE, s3cdma->memcpy.cap_mask);
- s3cdma->memcpy.dev = &pdev->dev;
- s3cdma->memcpy.device_free_chan_resources =
- s3c24xx_dma_free_chan_resources;
- s3cdma->memcpy.device_prep_dma_memcpy = s3c24xx_dma_prep_memcpy;
- s3cdma->memcpy.device_tx_status = s3c24xx_dma_tx_status;
- s3cdma->memcpy.device_issue_pending = s3c24xx_dma_issue_pending;
- s3cdma->memcpy.device_config = s3c24xx_dma_set_runtime_config;
- s3cdma->memcpy.device_terminate_all = s3c24xx_dma_terminate_all;
- s3cdma->memcpy.device_synchronize = s3c24xx_dma_synchronize;
-
- /* Initialize slave engine for SoC internal dedicated peripherals */
- dma_cap_set(DMA_SLAVE, s3cdma->slave.cap_mask);
- dma_cap_set(DMA_CYCLIC, s3cdma->slave.cap_mask);
- dma_cap_set(DMA_PRIVATE, s3cdma->slave.cap_mask);
- s3cdma->slave.dev = &pdev->dev;
- s3cdma->slave.device_free_chan_resources =
- s3c24xx_dma_free_chan_resources;
- s3cdma->slave.device_tx_status = s3c24xx_dma_tx_status;
- s3cdma->slave.device_issue_pending = s3c24xx_dma_issue_pending;
- s3cdma->slave.device_prep_slave_sg = s3c24xx_dma_prep_slave_sg;
- s3cdma->slave.device_prep_dma_cyclic = s3c24xx_dma_prep_dma_cyclic;
- s3cdma->slave.device_config = s3c24xx_dma_set_runtime_config;
- s3cdma->slave.device_terminate_all = s3c24xx_dma_terminate_all;
- s3cdma->slave.device_synchronize = s3c24xx_dma_synchronize;
- s3cdma->slave.filter.map = pdata->slave_map;
- s3cdma->slave.filter.mapcnt = pdata->slavecnt;
- s3cdma->slave.filter.fn = s3c24xx_dma_filter;
-
- /* Register as many memcpy channels as there are physical channels */
- ret = s3c24xx_dma_init_virtual_channels(s3cdma, &s3cdma->memcpy,
- pdata->num_phy_channels, false);
- if (ret <= 0) {
- dev_warn(&pdev->dev,
- "%s failed to enumerate memcpy channels - %d\n",
- __func__, ret);
- goto err_memcpy;
- }
-
- /* Register slave channels */
- ret = s3c24xx_dma_init_virtual_channels(s3cdma, &s3cdma->slave,
- pdata->num_channels, true);
- if (ret <= 0) {
- dev_warn(&pdev->dev,
- "%s failed to enumerate slave channels - %d\n",
- __func__, ret);
- goto err_slave;
- }
-
- ret = dma_async_device_register(&s3cdma->memcpy);
- if (ret) {
- dev_warn(&pdev->dev,
- "%s failed to register memcpy as an async device - %d\n",
- __func__, ret);
- goto err_memcpy_reg;
- }
-
- ret = dma_async_device_register(&s3cdma->slave);
- if (ret) {
- dev_warn(&pdev->dev,
- "%s failed to register slave as an async device - %d\n",
- __func__, ret);
- goto err_slave_reg;
- }
-
- platform_set_drvdata(pdev, s3cdma);
- dev_info(&pdev->dev, "Loaded dma driver with %d physical channels\n",
- pdata->num_phy_channels);
-
- return 0;
-
-err_slave_reg:
- dma_async_device_unregister(&s3cdma->memcpy);
-err_memcpy_reg:
- s3c24xx_dma_free_virtual_channels(&s3cdma->slave);
-err_slave:
- s3c24xx_dma_free_virtual_channels(&s3cdma->memcpy);
-err_memcpy:
- if (sdata->has_clocks)
- for (i = 0; i < pdata->num_phy_channels; i++) {
- struct s3c24xx_dma_phy *phy = &s3cdma->phy_chans[i];
- if (phy->valid)
- clk_unprepare(phy->clk);
- }
-
- return ret;
-}
-
-static void s3c24xx_dma_free_irq(struct platform_device *pdev,
- struct s3c24xx_dma_engine *s3cdma)
-{
- int i;
-
- for (i = 0; i < s3cdma->pdata->num_phy_channels; i++) {
- struct s3c24xx_dma_phy *phy = &s3cdma->phy_chans[i];
-
- devm_free_irq(&pdev->dev, phy->irq, phy);
- }
-}
-
-static int s3c24xx_dma_remove(struct platform_device *pdev)
-{
- const struct s3c24xx_dma_platdata *pdata = dev_get_platdata(&pdev->dev);
- struct s3c24xx_dma_engine *s3cdma = platform_get_drvdata(pdev);
- struct soc_data *sdata = s3c24xx_dma_get_soc_data(pdev);
- int i;
-
- dma_async_device_unregister(&s3cdma->slave);
- dma_async_device_unregister(&s3cdma->memcpy);
-
- s3c24xx_dma_free_irq(pdev, s3cdma);
-
- s3c24xx_dma_free_virtual_channels(&s3cdma->slave);
- s3c24xx_dma_free_virtual_channels(&s3cdma->memcpy);
-
- if (sdata->has_clocks)
- for (i = 0; i < pdata->num_phy_channels; i++) {
- struct s3c24xx_dma_phy *phy = &s3cdma->phy_chans[i];
- if (phy->valid)
- clk_unprepare(phy->clk);
- }
-
- return 0;
-}
-
-static struct platform_driver s3c24xx_dma_driver = {
- .driver = {
- .name = "s3c24xx-dma",
- },
- .id_table = s3c24xx_dma_driver_ids,
- .probe = s3c24xx_dma_probe,
- .remove = s3c24xx_dma_remove,
-};
-
-module_platform_driver(s3c24xx_dma_driver);
-
-bool s3c24xx_dma_filter(struct dma_chan *chan, void *param)
-{
- struct s3c24xx_dma_chan *s3cchan;
-
- if (chan->device->dev->driver != &s3c24xx_dma_driver.driver)
- return false;
-
- s3cchan = to_s3c24xx_dma_chan(chan);
-
- return s3cchan->id == (uintptr_t)param;
-}
-EXPORT_SYMBOL(s3c24xx_dma_filter);
-
-MODULE_DESCRIPTION("S3C24XX DMA Driver");
-MODULE_AUTHOR("Heiko Stuebner");
-MODULE_LICENSE("GPL v2");
projects / platform / kernel / linux-rpi.git / commitdiff