diff options
Diffstat (limited to 'drivers/dma/amba-pl08x.c')
| -rw-r--r-- | drivers/dma/amba-pl08x.c | 941 |
1 files changed, 473 insertions, 468 deletions
diff --git a/drivers/dma/amba-pl08x.c b/drivers/dma/amba-pl08x.c index 49ecbbb8932d..6fbeebb9486f 100644 --- a/drivers/dma/amba-pl08x.c +++ b/drivers/dma/amba-pl08x.c @@ -86,10 +86,12 @@ #include <asm/hardware/pl080.h> #include "dmaengine.h" +#include "virt-dma.h" #define DRIVER_NAME "pl08xdmac" static struct amba_driver pl08x_amba_driver; +struct pl08x_driver_data; /** * struct vendor_data - vendor-specific config parameters for PL08x derivatives @@ -119,6 +121,123 @@ struct pl08x_lli { }; /** + * struct pl08x_bus_data - information of source or destination + * busses for a transfer + * @addr: current address + * @maxwidth: the maximum width of a transfer on this bus + * @buswidth: the width of this bus in bytes: 1, 2 or 4 + */ +struct pl08x_bus_data { + dma_addr_t addr; + u8 maxwidth; + u8 buswidth; +}; + +/** + * struct pl08x_phy_chan - holder for the physical channels + * @id: physical index to this channel + * @lock: a lock to use when altering an instance of this struct + * @serving: the virtual channel currently being served by this physical + * channel + * @locked: channel unavailable for the system, e.g. dedicated to secure + * world + */ +struct pl08x_phy_chan { + unsigned int id; + void __iomem *base; + spinlock_t lock; + struct pl08x_dma_chan *serving; + bool locked; +}; + +/** + * struct pl08x_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 pl08x_sg { + dma_addr_t src_addr; + dma_addr_t dst_addr; + size_t len; + struct list_head node; +}; + +/** + * struct pl08x_txd - wrapper for struct dma_async_tx_descriptor + * @vd: virtual DMA descriptor + * @dsg_list: list of children sg's + * @llis_bus: DMA memory address (physical) start for the LLIs + * @llis_va: virtual memory address start for the LLIs + * @cctl: control reg values for current txd + * @ccfg: config reg values for current txd + * @done: this marks completed descriptors, which should not have their + * mux released. + */ +struct pl08x_txd { + struct virt_dma_desc vd; + struct list_head dsg_list; + dma_addr_t llis_bus; + struct pl08x_lli *llis_va; + /* Default cctl value for LLIs */ + u32 cctl; + /* + * Settings to be put into the physical channel when we + * trigger this txd. Other registers are in llis_va[0]. + */ + u32 ccfg; + bool done; +}; + +/** + * struct pl08x_dma_chan_state - holds the PL08x specific virtual channel + * states + * @PL08X_CHAN_IDLE: the channel is idle + * @PL08X_CHAN_RUNNING: the channel has allocated a physical transport + * channel and is running a transfer on it + * @PL08X_CHAN_PAUSED: the channel has allocated a physical transport + * channel, but the transfer is currently paused + * @PL08X_CHAN_WAITING: the channel is waiting for a physical transport + * channel to become available (only pertains to memcpy channels) + */ +enum pl08x_dma_chan_state { + PL08X_CHAN_IDLE, + PL08X_CHAN_RUNNING, + PL08X_CHAN_PAUSED, + PL08X_CHAN_WAITING, +}; + +/** + * struct pl08x_dma_chan - this structure wraps a DMA ENGINE channel + * @vc: wrappped virtual channel + * @phychan: the physical channel utilized by this channel, if there is one + * @name: name of channel + * @cd: channel platform data + * @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, paused, running etc + * @slave: whether this channel is a device (slave) or for memcpy + * @signal: the physical DMA request signal which this channel is using + * @mux_use: count of descriptors using this DMA request signal setting + */ +struct pl08x_dma_chan { + struct virt_dma_chan vc; + struct pl08x_phy_chan *phychan; + const char *name; + const struct pl08x_channel_data *cd; + struct dma_slave_config cfg; + struct pl08x_txd *at; + struct pl08x_driver_data *host; + enum pl08x_dma_chan_state state; + bool slave; + int signal; + unsigned mux_use; +}; + +/** * struct pl08x_driver_data - the local state holder for the PL08x * @slave: slave engine for this instance * @memcpy: memcpy engine for this instance @@ -128,7 +247,6 @@ struct pl08x_lli { * @pd: platform data passed in from the platform/machine * @phy_chans: array of data for the physical channels * @pool: a pool for the LLI descriptors - * @pool_ctr: counter of LLIs in the pool * @lli_buses: bitmask to or in to LLI pointer selecting AHB port for LLI * fetches * @mem_buses: set to indicate memory transfers on AHB2. @@ -143,10 +261,8 @@ struct pl08x_driver_data { struct pl08x_platform_data *pd; struct pl08x_phy_chan *phy_chans; struct dma_pool *pool; - int pool_ctr; u8 lli_buses; u8 mem_buses; - spinlock_t lock; }; /* @@ -162,12 +278,51 @@ struct pl08x_driver_data { static inline struct pl08x_dma_chan *to_pl08x_chan(struct dma_chan *chan) { - return container_of(chan, struct pl08x_dma_chan, chan); + return container_of(chan, struct pl08x_dma_chan, vc.chan); } static inline struct pl08x_txd *to_pl08x_txd(struct dma_async_tx_descriptor *tx) { - return container_of(tx, struct pl08x_txd, tx); + return container_of(tx, struct pl08x_txd, vd.tx); +} + +/* + * Mux handling. + * + * This gives us the DMA request input to the PL08x primecell which the + * peripheral described by the channel data will be routed to, possibly + * via a board/SoC specific external MUX. One important point to note + * here is that this does not depend on the physical channel. + */ +static int pl08x_request_mux(struct pl08x_dma_chan *plchan) +{ + const struct pl08x_platform_data *pd = plchan->host->pd; + int ret; + + if (plchan->mux_use++ == 0 && pd->get_signal) { + ret = pd->get_signal(plchan->cd); + if (ret < 0) { + plchan->mux_use = 0; + return ret; + } + + plchan->signal = ret; + } + return 0; +} + +static void pl08x_release_mux(struct pl08x_dma_chan *plchan) +{ + const struct pl08x_platform_data *pd = plchan->host->pd; + + if (plchan->signal >= 0) { + WARN_ON(plchan->mux_use == 0); + + if (--plchan->mux_use == 0 && pd->put_signal) { + pd->put_signal(plchan->cd, plchan->signal); + plchan->signal = -1; + } + } } /* @@ -189,20 +344,25 @@ static int pl08x_phy_channel_busy(struct pl08x_phy_chan *ch) * been set when the LLIs were constructed. Poke them into the hardware * and start the transfer. */ -static void pl08x_start_txd(struct pl08x_dma_chan *plchan, - struct pl08x_txd *txd) +static void pl08x_start_next_txd(struct pl08x_dma_chan *plchan) { struct pl08x_driver_data *pl08x = plchan->host; struct pl08x_phy_chan *phychan = plchan->phychan; - struct pl08x_lli *lli = &txd->llis_va[0]; + struct virt_dma_desc *vd = vchan_next_desc(&plchan->vc); + struct pl08x_txd *txd = to_pl08x_txd(&vd->tx); + struct pl08x_lli *lli; u32 val; + list_del(&txd->vd.node); + plchan->at = txd; /* Wait for channel inactive */ while (pl08x_phy_channel_busy(phychan)) cpu_relax(); + lli = &txd->llis_va[0]; + dev_vdbg(&pl08x->adev->dev, "WRITE channel %d: csrc=0x%08x, cdst=0x%08x, " "clli=0x%08x, cctl=0x%08x, ccfg=0x%08x\n", @@ -311,10 +471,8 @@ static u32 pl08x_getbytes_chan(struct pl08x_dma_chan *plchan) { struct pl08x_phy_chan *ch; struct pl08x_txd *txd; - unsigned long flags; size_t bytes = 0; - spin_lock_irqsave(&plchan->lock, flags); ch = plchan->phychan; txd = plchan->at; @@ -354,18 +512,6 @@ static u32 pl08x_getbytes_chan(struct pl08x_dma_chan *plchan) } } - /* Sum up all queued transactions */ - if (!list_empty(&plchan->pend_list)) { - struct pl08x_txd *txdi; - list_for_each_entry(txdi, &plchan->pend_list, node) { - struct pl08x_sg *dsg; - list_for_each_entry(dsg, &txd->dsg_list, node) - bytes += dsg->len; - } - } - - spin_unlock_irqrestore(&plchan->lock, flags); - return bytes; } @@ -391,7 +537,6 @@ pl08x_get_phy_channel(struct pl08x_driver_data *pl08x, if (!ch->locked && !ch->serving) { ch->serving = virt_chan; - ch->signal = -1; spin_unlock_irqrestore(&ch->lock, flags); break; } @@ -404,25 +549,114 @@ pl08x_get_phy_channel(struct pl08x_driver_data *pl08x, return NULL; } - pm_runtime_get_sync(&pl08x->adev->dev); return ch; } +/* Mark the physical channel as free. Note, this write is atomic. */ static inline void pl08x_put_phy_channel(struct pl08x_driver_data *pl08x, struct pl08x_phy_chan *ch) { - unsigned long flags; + ch->serving = NULL; +} + +/* + * 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 pl08x_phy_alloc_and_start(struct pl08x_dma_chan *plchan) +{ + struct pl08x_driver_data *pl08x = plchan->host; + struct pl08x_phy_chan *ch; - spin_lock_irqsave(&ch->lock, flags); + ch = pl08x_get_phy_channel(pl08x, plchan); + if (!ch) { + dev_dbg(&pl08x->adev->dev, "no physical channel available for xfer on %s\n", plchan->name); + plchan->state = PL08X_CHAN_WAITING; + return; + } - /* Stop the channel and clear its interrupts */ - pl08x_terminate_phy_chan(pl08x, ch); + dev_dbg(&pl08x->adev->dev, "allocated physical channel %d for xfer on %s\n", + ch->id, plchan->name); - pm_runtime_put(&pl08x->adev->dev); + plchan->phychan = ch; + plchan->state = PL08X_CHAN_RUNNING; + pl08x_start_next_txd(plchan); +} - /* Mark it as free */ - ch->serving = NULL; - spin_unlock_irqrestore(&ch->lock, flags); +static void pl08x_phy_reassign_start(struct pl08x_phy_chan *ch, + struct pl08x_dma_chan *plchan) +{ + struct pl08x_driver_data *pl08x = plchan->host; + + dev_dbg(&pl08x->adev->dev, "reassigned physical channel %d for xfer on %s\n", + ch->id, plchan->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. + */ + ch->serving = plchan; + plchan->phychan = ch; + plchan->state = PL08X_CHAN_RUNNING; + pl08x_start_next_txd(plchan); +} + +/* + * Free a physical DMA channel, potentially reallocating it to another + * virtual channel if we have any pending. + */ +static void pl08x_phy_free(struct pl08x_dma_chan *plchan) +{ + struct pl08x_driver_data *pl08x = plchan->host; + struct pl08x_dma_chan *p, *next; + + retry: + next = NULL; + + /* Find a waiting virtual channel for the next transfer. */ + list_for_each_entry(p, &pl08x->memcpy.channels, vc.chan.device_node) + if (p->state == PL08X_CHAN_WAITING) { + next = p; + break; + } + + if (!next) { + list_for_each_entry(p, &pl08x->slave.channels, vc.chan.device_node) + if (p->state == PL08X_CHAN_WAITING) { + next = p; + break; + } + } + + /* Ensure that the physical channel is stopped */ + pl08x_terminate_phy_chan(pl08x, plchan->phychan); + + 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 == PL08X_CHAN_WAITING; + if (success) + pl08x_phy_reassign_start(plchan->phychan, 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 */ + pl08x_put_phy_channel(pl08x, plchan->phychan); + } + + plchan->phychan = NULL; + plchan->state = PL08X_CHAN_IDLE; } /* @@ -585,8 +819,6 @@ static int pl08x_fill_llis_for_desc(struct pl08x_driver_data *pl08x, return 0; } - pl08x->pool_ctr++; - bd.txd = txd; bd.lli_bus = (pl08x->lli_buses & PL08X_AHB2) ? PL080_LLI_LM_AHB2 : 0; cctl = txd->cctl; @@ -802,18 +1034,14 @@ static int pl08x_fill_llis_for_desc(struct pl08x_driver_data *pl08x, return num_llis; } -/* You should call this with the struct pl08x lock held */ static void pl08x_free_txd(struct pl08x_driver_data *pl08x, struct pl08x_txd *txd) { struct pl08x_sg *dsg, *_dsg; - /* Free the LLI */ if (txd->llis_va) dma_pool_free(pl08x->pool, txd->llis_va, txd->llis_bus); - pl08x->pool_ctr--; - list_for_each_entry_safe(dsg, _dsg, &txd->dsg_list, node) { list_del(&dsg->node); kfree(dsg); @@ -822,133 +1050,75 @@ static void pl08x_free_txd(struct pl08x_driver_data *pl08x, kfree(txd); } -static void pl08x_free_txd_list(struct pl08x_driver_data *pl08x, - struct pl08x_dma_chan *plchan) +static void pl08x_unmap_buffers(struct pl08x_txd *txd) { - struct pl08x_txd *txdi = NULL; - struct pl08x_txd *next; - - if (!list_empty(&plchan->pend_list)) { - list_for_each_entry_safe(txdi, - next, &plchan->pend_list, node) { - list_del(&txdi->node); - pl08x_free_txd(pl08x, txdi); + struct device *dev = txd->vd.tx.chan->device->dev; + struct pl08x_sg *dsg; + + if (!(txd->vd.tx.flags & DMA_COMPL_SKIP_SRC_UNMAP)) { + if (txd->vd.tx.flags & DMA_COMPL_SRC_UNMAP_SINGLE) + list_for_each_entry(dsg, &txd->dsg_list, node) + dma_unmap_single(dev, dsg->src_addr, dsg->len, + DMA_TO_DEVICE); + else { + list_for_each_entry(dsg, &txd->dsg_list, node) + dma_unmap_page(dev, dsg->src_addr, dsg->len, + DMA_TO_DEVICE); } } + if (!(txd->vd.tx.flags & DMA_COMPL_SKIP_DEST_UNMAP)) { + if (txd->vd.tx.flags & DMA_COMPL_DEST_UNMAP_SINGLE) + list_for_each_entry(dsg, &txd->dsg_list, node) + dma_unmap_single(dev, dsg->dst_addr, dsg->len, + DMA_FROM_DEVICE); + else + list_for_each_entry(dsg, &txd->dsg_list, node) + dma_unmap_page(dev, dsg->dst_addr, dsg->len, + DMA_FROM_DEVICE); + } } -/* - * The DMA ENGINE API - */ -static int pl08x_alloc_chan_resources(struct dma_chan *chan) +static void pl08x_desc_free(struct virt_dma_desc *vd) { - return 0; -} + struct pl08x_txd *txd = to_pl08x_txd(&vd->tx); + struct pl08x_dma_chan *plchan = to_pl08x_chan(vd->tx.chan); -static void pl08x_free_chan_resources(struct dma_chan *chan) -{ + if (!plchan->slave) + pl08x_unmap_buffers(txd); + + if (!txd->done) + pl08x_release_mux(plchan); + + pl08x_free_txd(plchan->host, txd); } -/* - * This should be called with the channel plchan->lock held - */ -static int prep_phy_channel(struct pl08x_dma_chan *plchan, - struct pl08x_txd *txd) +static void pl08x_free_txd_list(struct pl08x_driver_data *pl08x, + struct pl08x_dma_chan *plchan) { - struct pl08x_driver_data *pl08x = plchan->host; - struct pl08x_phy_chan *ch; - int ret; - - /* Check if we already have a channel */ - if (plchan->phychan) { - ch = plchan->phychan; - goto got_channel; - } + LIST_HEAD(head); + struct pl08x_txd *txd; - ch = pl08x_get_phy_channel(pl08x, plchan); - if (!ch) { - /* No physical channel available, cope with it */ - dev_dbg(&pl08x->adev->dev, "no physical channel available for xfer on %s\n", plchan->name); - return -EBUSY; - } + vchan_get_all_descriptors(&plchan->vc, &head); - /* - * OK we have a physical channel: for memcpy() this is all we - * need, but for slaves the physical signals may be muxed! - * Can the platform allow us to use this channel? - */ - if (plchan->slave && pl08x->pd->get_signal) { - ret = pl08x->pd->get_signal(plchan); - if (ret < 0) { - dev_dbg(&pl08x->adev->dev, - "unable to use physical channel %d for transfer on %s due to platform restrictions\n", - ch->id, plchan->name); - /* Release physical channel & return */ - pl08x_put_phy_channel(pl08x, ch); - return -EBUSY; - } - ch->signal = ret; + while (!list_empty(&head)) { + txd = list_first_entry(&head, struct pl08x_txd, vd.node); + list_del(&txd->vd.node); + pl08x_desc_free(&txd->vd); } - - plchan->phychan = ch; - dev_dbg(&pl08x->adev->dev, "allocated physical channel %d and signal %d for xfer on %s\n", - ch->id, - ch->signal, - plchan->name); - -got_channel: - /* Assign the flow control signal to this channel */ - if (txd->direction == DMA_MEM_TO_DEV) - txd->ccfg |= ch->signal << PL080_CONFIG_DST_SEL_SHIFT; - else if (txd->direction == DMA_DEV_TO_MEM) - txd->ccfg |= ch->signal << PL080_CONFIG_SRC_SEL_SHIFT; - - plchan->phychan_hold++; - - return 0; } -static void release_phy_channel(struct pl08x_dma_chan *plchan) +/* + * The DMA ENGINE API + */ +static int pl08x_alloc_chan_resources(struct dma_chan *chan) { - struct pl08x_driver_data *pl08x = plchan->host; - - if ((plchan->phychan->signal >= 0) && pl08x->pd->put_signal) { - pl08x->pd->put_signal(plchan); - plchan->phychan->signal = -1; - } - pl08x_put_phy_channel(pl08x, plchan->phychan); - plchan->phychan = NULL; + return 0; } -static dma_cookie_t pl08x_tx_submit(struct dma_async_tx_descriptor *tx) +static void pl08x_free_chan_resources(struct dma_chan *chan) { - struct pl08x_dma_chan *plchan = to_pl08x_chan(tx->chan); - struct pl08x_txd *txd = to_pl08x_txd(tx); - unsigned long flags; - dma_cookie_t cookie; - - spin_lock_irqsave(&plchan->lock, flags); - cookie = dma_cookie_assign(tx); - - /* Put this onto the pending list */ - list_add_tail(&txd->node, &plchan->pend_list); - - /* - * If there was no physical channel available for this memcpy, - * stack the request up and indicate that the channel is waiting - * for a free physical channel. - */ - if (!plchan->slave && !plchan->phychan) { - /* Do this memcpy whenever there is a channel ready */ - plchan->state = PL08X_CHAN_WAITING; - plchan->waiting = txd; - } else { - plchan->phychan_hold--; - } - - spin_unlock_irqrestore(&plchan->lock, flags); - - return cookie; + /* Ensure all queued descriptors are freed */ + vchan_free_chan_resources(to_virt_chan(chan)); } static struct dma_async_tx_descriptor *pl08x_prep_dma_interrupt( @@ -968,23 +1138,53 @@ static enum dma_status pl08x_dma_tx_status(struct dma_chan *chan, dma_cookie_t cookie, struct dma_tx_state *txstate) { struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); + struct virt_dma_desc *vd; + unsigned long flags; enum dma_status ret; + size_t bytes = 0; ret = dma_cookie_status(chan, cookie, txstate); if (ret == DMA_SUCCESS) return ret; /* + * There's no point calculating the residue if there's + * no txstate to store the value. + */ + if (!txstate) { + if (plchan->state == PL08X_CHAN_PAUSED) + ret = DMA_PAUSED; + return ret; + } + + spin_lock_irqsave(&plchan->vc.lock, flags); + ret = dma_cookie_status(chan, cookie, txstate); + if (ret != DMA_SUCCESS) { + vd = vchan_find_desc(&plchan->vc, cookie); + if (vd) { + /* On the issued list, so hasn't been processed yet */ + struct pl08x_txd *txd = to_pl08x_txd(&vd->tx); + struct pl08x_sg *dsg; + + list_for_each_entry(dsg, &txd->dsg_list, node) + bytes += dsg->len; + } else { + bytes = pl08x_getbytes_chan(plchan); + } + } + spin_unlock_irqrestore(&plchan->vc.lock, flags); + + /* * This cookie not complete yet * Get number of bytes left in the active transactions and queue */ - dma_set_residue(txstate, pl08x_getbytes_chan(plchan)); + dma_set_residue(txstate, bytes); - if (plchan->state == PL08X_CHAN_PAUSED) - return DMA_PAUSED; + if (plchan->state == PL08X_CHAN_PAUSED && ret == DMA_IN_PROGRESS) + ret = DMA_PAUSED; /* Whether waiting or running, we're in progress */ - return DMA_IN_PROGRESS; + return ret; } /* PrimeCell DMA extension */ @@ -1080,38 +1280,14 @@ static u32 pl08x_burst(u32 maxburst) return burst_sizes[i].reg; } -static int dma_set_runtime_config(struct dma_chan *chan, - struct dma_slave_config *config) +static u32 pl08x_get_cctl(struct pl08x_dma_chan *plchan, + enum dma_slave_buswidth addr_width, u32 maxburst) { - struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); - struct pl08x_driver_data *pl08x = plchan->host; - enum dma_slave_buswidth addr_width; - u32 width, burst, maxburst; - u32 cctl = 0; - - if (!plchan->slave) - return -EINVAL; - - /* Transfer direction */ - plchan->runtime_direction = config->direction; - if (config->direction == DMA_MEM_TO_DEV) { - addr_width = config->dst_addr_width; - maxburst = config->dst_maxburst; - } else if (config->direction == DMA_DEV_TO_MEM) { - addr_width = config->src_addr_width; - maxburst = config->src_maxburst; - } else { - dev_err(&pl08x->adev->dev, - "bad runtime_config: alien transfer direction\n"); - return -EINVAL; - } + u32 width, burst, cctl = 0; width = pl08x_width(addr_width); - if (width == ~0) { - dev_err(&pl08x->adev->dev, - "bad runtime_config: alien address width\n"); - return -EINVAL; - } + if (width == ~0) + return ~0; cctl |= width << PL080_CONTROL_SWIDTH_SHIFT; cctl |= width << PL080_CONTROL_DWIDTH_SHIFT; @@ -1128,28 +1304,23 @@ static int dma_set_runtime_config(struct dma_chan *chan, cctl |= burst << PL080_CONTROL_SB_SIZE_SHIFT; cctl |= burst << PL080_CONTROL_DB_SIZE_SHIFT; - plchan->device_fc = config->device_fc; + return pl08x_cctl(cctl); +} - if (plchan->runtime_direction == DMA_DEV_TO_MEM) { - plchan->src_addr = config->src_addr; - plchan->src_cctl = pl08x_cctl(cctl) | PL080_CONTROL_DST_INCR | - pl08x_select_bus(plchan->cd->periph_buses, - pl08x->mem_buses); - } else { - plchan->dst_addr = config->dst_addr; - plchan->dst_cctl = pl08x_cctl(cctl) | PL080_CONTROL_SRC_INCR | - pl08x_select_bus(pl08x->mem_buses, - plchan->cd->periph_buses); - } +static int dma_set_runtime_config(struct dma_chan *chan, + struct dma_slave_config *config) +{ + struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); - dev_dbg(&pl08x->adev->dev, - "configured channel %s (%s) for %s, data width %d, " - "maxburst %d words, LE, CCTL=0x%08x\n", - dma_chan_name(chan), plchan->name, - (config->direction == DMA_DEV_TO_MEM) ? "RX" : "TX", - addr_width, - maxburst, - cctl); + if (!plchan->slave) + return -EINVAL; + + /* 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; + + plchan->cfg = *config; return 0; } @@ -1163,95 +1334,19 @@ static void pl08x_issue_pending(struct dma_chan *chan) struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); unsigned long flags; - spin_lock_irqsave(&plchan->lock, flags); - /* Something is already active, or we're waiting for a channel... */ - if (plchan->at || plchan->state == PL08X_CHAN_WAITING) { - spin_unlock_irqrestore(&plchan->lock, flags); - return; - } - - /* Take the first element in the queue and execute it */ - if (!list_empty(&plchan->pend_list)) { - struct pl08x_txd *next; - - next = list_first_entry(&plchan->pend_list, - struct pl08x_txd, - node); - list_del(&next->node); - plchan->state = PL08X_CHAN_RUNNING; - - pl08x_start_txd(plchan, next); + spin_lock_irqsave(&plchan->vc.lock, flags); + if (vchan_issue_pending(&plchan->vc)) { + if (!plchan->phychan && plchan->state != PL08X_CHAN_WAITING) + pl08x_phy_alloc_and_start(plchan); } - - spin_unlock_irqrestore(&plchan->lock, flags); -} - -static int pl08x_prep_channel_resources(struct pl08x_dma_chan *plchan, - struct pl08x_txd *txd) -{ - struct pl08x_driver_data *pl08x = plchan->host; - unsigned long flags; - int num_llis, ret; - - num_llis = pl08x_fill_llis_for_desc(pl08x, txd); - if (!num_llis) { - spin_lock_irqsave(&plchan->lock, flags); - pl08x_free_txd(pl08x, txd); - spin_unlock_irqrestore(&plchan->lock, flags); - return -EINVAL; - } - - spin_lock_irqsave(&plchan->lock, flags); - - /* - * See if we already have a physical channel allocated, - * else this is the time to try to get one. - */ - ret = prep_phy_channel(plchan, txd); - if (ret) { - /* - * No physical channel was available. - * - * memcpy transfers can be sorted out at submission time. - * - * Slave transfers may have been denied due to platform - * channel muxing restrictions. Since there is no guarantee - * that this will ever be resolved, and the signal must be - * acquired AFTER acquiring the physical channel, we will let - * them be NACK:ed with -EBUSY here. The drivers can retry - * the prep() call if they are eager on doing this using DMA. - */ - if (plchan->slave) { - pl08x_free_txd_list(pl08x, plchan); - pl08x_free_txd(pl08x, txd); - spin_unlock_irqrestore(&plchan->lock, flags); - return -EBUSY; - } - } else - /* - * Else we're all set, paused and ready to roll, status - * will switch to PL08X_CHAN_RUNNING when we call - * issue_pending(). If there is something running on the - * channel already we don't change its state. - */ - if (plchan->state == PL08X_CHAN_IDLE) - plchan->state = PL08X_CHAN_PAUSED; - - spin_unlock_irqrestore(&plchan->lock, flags); - - return 0; + spin_unlock_irqrestore(&plchan->vc.lock, flags); } -static struct pl08x_txd *pl08x_get_txd(struct pl08x_dma_chan *plchan, - unsigned long flags) +static struct pl08x_txd *pl08x_get_txd(struct pl08x_dma_chan *plchan) { struct pl08x_txd *txd = kzalloc(sizeof(*txd), GFP_NOWAIT); if (txd) { - dma_async_tx_descriptor_init(&txd->tx, &plchan->chan); - txd->tx.flags = flags; - txd->tx.tx_submit = pl08x_tx_submit; - INIT_LIST_HEAD(&txd->node); INIT_LIST_HEAD(&txd->dsg_list); /* Always enable error and terminal interrupts */ @@ -1274,7 +1369,7 @@ static struct dma_async_tx_descriptor *pl08x_prep_dma_memcpy( struct pl08x_sg *dsg; int ret; - txd = pl08x_get_txd(plchan, flags); + txd = pl08x_get_txd(plchan); if (!txd) { dev_err(&pl08x->adev->dev, "%s no memory for descriptor\n", __func__); @@ -1290,14 +1385,13 @@ static struct dma_async_tx_descriptor *pl08x_prep_dma_memcpy( } list_add_tail(&dsg->node, &txd->dsg_list); - txd->direction = DMA_NONE; dsg->src_addr = src; dsg->dst_addr = dest; dsg->len = len; /* Set platform data for m2m */ txd->ccfg |= PL080_FLOW_MEM2MEM << PL080_CONFIG_FLOW_CONTROL_SHIFT; - txd->cctl = pl08x->pd->memcpy_channel.cctl & + txd->cctl = pl08x->pd->memcpy_channel.cctl_memcpy & ~(PL080_CONTROL_DST_AHB2 | PL080_CONTROL_SRC_AHB2); /* Both to be incremented or the code will break */ @@ -1307,11 +1401,13 @@ static struct dma_async_tx_descriptor *pl08x_prep_dma_memcpy( txd->cctl |= pl08x_select_bus(pl08x->mem_buses, pl08x->mem_buses); - ret = pl08x_prep_channel_resources(plchan, txd); - if (ret) + ret = pl08x_fill_llis_for_desc(plchan->host, txd); + if (!ret) { + pl08x_free_txd(pl08x, txd); return NULL; + } - return &txd->tx; + return vchan_tx_prep(&plchan->vc, &txd->vd, flags); } static struct dma_async_tx_descriptor *pl08x_prep_slave_sg( @@ -1324,36 +1420,40 @@ static struct dma_async_tx_descriptor *pl08x_prep_slave_sg( struct pl08x_txd *txd; struct pl08x_sg *dsg; struct scatterlist *sg; + enum dma_slave_buswidth addr_width; dma_addr_t slave_addr; int ret, tmp; + u8 src_buses, dst_buses; + u32 maxburst, cctl; dev_dbg(&pl08x->adev->dev, "%s prepare transaction of %d bytes from %s\n", __func__, sg_dma_len(sgl), plchan->name); - txd = pl08x_get_txd(plchan, flags); + txd = pl08x_get_txd(plchan); if (!txd) { dev_err(&pl08x->adev->dev, "%s no txd\n", __func__); return NULL; } - if (direction != plchan->runtime_direction) - dev_err(&pl08x->adev->dev, "%s DMA setup does not match " - "the direction configured for the PrimeCell\n", - __func__); - /* * Set up addresses, the PrimeCell configured address * will take precedence since this may configure the * channel target address dynamically at runtime. */ - txd->direction = direction; - if (direction == DMA_MEM_TO_DEV) { - txd->cctl = plchan->dst_cctl; - slave_addr = plchan->dst_addr; + cctl = PL080_CONTROL_SRC_INCR; + slave_addr = plchan->cfg.dst_addr; + addr_width = plchan->cfg.dst_addr_width; + maxburst = plchan->cfg.dst_maxburst; + src_buses = pl08x->mem_buses; + dst_buses = plchan->cd->periph_buses; } else if (direction == DMA_DEV_TO_MEM) { - txd->cctl = plchan->src_cctl; - slave_addr = plchan->src_addr; + cctl = PL080_CONTROL_DST_INCR; + slave_addr = plchan->cfg.src_addr; + addr_width = plchan->cfg.src_addr_width; + maxburst = plchan->cfg.src_maxburst; + src_buses = plchan->cd->periph_buses; + dst_buses = pl08x->mem_buses; } else { pl08x_free_txd(pl08x, txd); dev_err(&pl08x->adev->dev, @@ -1361,7 +1461,17 @@ static struct dma_async_tx_descriptor *pl08x_prep_slave_sg( return NULL; } - if (plchan->device_fc) + cctl |= pl08x_get_cctl(plchan, addr_width, maxburst); + if (cctl == ~0) { + pl08x_free_txd(pl08x, txd); + dev_err(&pl08x->adev->dev, + "DMA slave configuration botched?\n"); + return NULL; + } + + txd->cctl = cctl | pl08x_select_bus(src_buses, dst_buses); + + if (plchan->cfg.device_fc) tmp = (direction == DMA_MEM_TO_DEV) ? PL080_FLOW_MEM2PER_PER : PL080_FLOW_PER2MEM_PER; else @@ -1370,9 +1480,28 @@ static struct dma_async_tx_descriptor *pl08x_prep_slave_sg( txd->ccfg |= tmp << PL080_CONFIG_FLOW_CONTROL_SHIFT; + ret = pl08x_request_mux(plchan); + if (ret < 0) { + pl08x_free_txd(pl08x, txd); + dev_dbg(&pl08x->adev->dev, + "unable to mux for transfer on %s due to platform restrictions\n", + plchan->name); + return NULL; + } + + dev_dbg(&pl08x->adev->dev, "allocated DMA request signal %d for xfer on %s\n", + plchan->signal, plchan->name); + + /* Assign the flow control signal to this channel */ + if (direction == DMA_MEM_TO_DEV) + txd->ccfg |= plchan->signal << PL080_CONFIG_DST_SEL_SHIFT; + else + txd->ccfg |= plchan->signal << PL080_CONFIG_SRC_SEL_SHIFT; + for_each_sg(sgl, sg, sg_len, tmp) { dsg = kzalloc(sizeof(struct pl08x_sg), GFP_NOWAIT); if (!dsg) { + pl08x_release_mux(plchan); pl08x_free_txd(pl08x, txd); dev_err(&pl08x->adev->dev, "%s no mem for pl080 sg\n", __func__); @@ -1390,11 +1519,14 @@ static struct dma_async_tx_descriptor *pl08x_prep_slave_sg( } } - ret = pl08x_prep_channel_resources(plchan, txd); - if (ret) + ret = pl08x_fill_llis_for_desc(plchan->host, txd); + if (!ret) { + pl08x_release_mux(plchan); + pl08x_free_txd(pl08x, txd); return NULL; + } - return &txd->tx; + return vchan_tx_prep(&plchan->vc, &txd->vd, flags); } static int pl08x_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, @@ -1415,9 +1547,9 @@ static int pl08x_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, * Anything succeeds on channels with no physical allocation and * no queued transfers. */ - spin_lock_irqsave(&plchan->lock, flags); + spin_lock_irqsave(&plchan->vc.lock, flags); if (!plchan->phychan && !plchan->at) { - spin_unlock_irqrestore(&plchan->lock, flags); + spin_unlock_irqrestore(&plchan->vc.lock, flags); return 0; } @@ -1426,18 +1558,15 @@ static int pl08x_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, plchan->state = PL08X_CHAN_IDLE; if (plchan->phychan) { - pl08x_terminate_phy_chan(pl08x, plchan->phychan); - /* * Mark physical channel as free and free any slave * signal */ - release_phy_channel(plchan); - plchan->phychan_hold = 0; + pl08x_phy_free(plchan); } /* Dequeue jobs and free LLIs */ if (plchan->at) { - pl08x_free_txd(pl08x, plchan->at); + pl08x_desc_free(&plchan->at->vd); plchan->at = NULL; } /* Dequeue jobs not yet fired as well */ @@ -1457,7 +1586,7 @@ static int pl08x_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, break; } - spin_unlock_irqrestore(&plchan->lock, flags); + spin_unlock_irqrestore(&plchan->vc.lock, flags); return ret; } @@ -1494,123 +1623,6 @@ static void pl08x_ensure_on(struct pl08x_driver_data *pl08x) writel(PL080_CONFIG_ENABLE, pl08x->base + PL080_CONFIG); } -static void pl08x_unmap_buffers(struct pl08x_txd *txd) -{ - struct device *dev = txd->tx.chan->device->dev; - struct pl08x_sg *dsg; - - if (!(txd->tx.flags & DMA_COMPL_SKIP_SRC_UNMAP)) { - if (txd->tx.flags & DMA_COMPL_SRC_UNMAP_SINGLE) - list_for_each_entry(dsg, &txd->dsg_list, node) - dma_unmap_single(dev, dsg->src_addr, dsg->len, - DMA_TO_DEVICE); - else { - list_for_each_entry(dsg, &txd->dsg_list, node) - dma_unmap_page(dev, dsg->src_addr, dsg->len, - DMA_TO_DEVICE); - } - } - if (!(txd->tx.flags & DMA_COMPL_SKIP_DEST_UNMAP)) { - if (txd->tx.flags & DMA_COMPL_DEST_UNMAP_SINGLE) - list_for_each_entry(dsg, &txd->dsg_list, node) - dma_unmap_single(dev, dsg->dst_addr, dsg->len, - DMA_FROM_DEVICE); - else - list_for_each_entry(dsg, &txd->dsg_list, node) - dma_unmap_page(dev, dsg->dst_addr, dsg->len, - DMA_FROM_DEVICE); - } -} - -static void pl08x_tasklet(unsigned long data) -{ - struct pl08x_dma_chan *plchan = (struct pl08x_dma_chan *) data; - struct pl08x_driver_data *pl08x = plchan->host; - struct pl08x_txd *txd; - unsigned long flags; - - spin_lock_irqsave(&plchan->lock, flags); - - txd = plchan->at; - plchan->at = NULL; - - if (txd) { - /* Update last completed */ - dma_cookie_complete(&txd->tx); - } - - /* If a new descriptor is queued, set it up plchan->at is NULL here */ - if (!list_empty(&plchan->pend_list)) { - struct pl08x_txd *next; - - next = list_first_entry(&plchan->pend_list, - struct pl08x_txd, - node); - list_del(&next->node); - - pl08x_start_txd(plchan, next); - } else if (plchan->phychan_hold) { - /* - * This channel is still in use - we have a new txd being - * prepared and will soon be queued. Don't give up the - * physical channel. - */ - } else { - struct pl08x_dma_chan *waiting = NULL; - - /* - * No more jobs, so free up the physical channel - * Free any allocated signal on slave transfers too - */ - release_phy_channel(plchan); - plchan->state = PL08X_CHAN_IDLE; - - /* - * And NOW before anyone else can grab that free:d up - * physical channel, see if there is some memcpy pending - * that seriously needs to start because of being stacked - * up while we were choking the physical channels with data. - */ - list_for_each_entry(waiting, &pl08x->memcpy.channels, - chan.device_node) { - if (waiting->state == PL08X_CHAN_WAITING && - waiting->waiting != NULL) { - int ret; - - /* This should REALLY not fail now */ - ret = prep_phy_channel(waiting, - waiting->waiting); - BUG_ON(ret); - waiting->phychan_hold--; - waiting->state = PL08X_CHAN_RUNNING; - waiting->waiting = NULL; - pl08x_issue_pending(&waiting->chan); - break; - } - } - } - - spin_unlock_irqrestore(&plchan->lock, flags); - - if (txd) { - dma_async_tx_callback callback = txd->tx.callback; - void *callback_param = txd->tx.callback_param; - - /* Don't try to unmap buffers on slave channels */ - if (!plchan->slave) - pl08x_unmap_buffers(txd); - - /* Free the descriptor */ - spin_lock_irqsave(&plchan->lock, flags); - pl08x_free_txd(pl08x, txd); - spin_unlock_irqrestore(&plchan->lock, flags); - - /* Callback to signal completion */ - if (callback) - callback(callback_param); - } -} - static irqreturn_t pl08x_irq(int irq, void *dev) { struct pl08x_driver_data *pl08x = dev; @@ -1635,6 +1647,7 @@ static irqreturn_t pl08x_irq(int irq, void *dev) /* Locate physical channel */ struct pl08x_phy_chan *phychan = &pl08x->phy_chans[i]; struct pl08x_dma_chan *plchan = phychan->serving; + struct pl08x_txd *tx; if (!plchan) { dev_err(&pl08x->adev->dev, @@ -1643,8 +1656,29 @@ static irqreturn_t pl08x_irq(int irq, void *dev) continue; } - /* Schedule tasklet on this channel */ - tasklet_schedule(&plchan->tasklet); + spin_lock(&plchan->vc.lock); + tx = plchan->at; + if (tx) { + plchan->at = NULL; + /* + * This descriptor is done, release its mux + * reservation. + */ + pl08x_release_mux(plchan); + tx->done = true; + vchan_cookie_complete(&tx->vd); + + /* + * And start the next descriptor (if any), + * otherwise free this channel. + */ + if (vchan_next_desc(&plchan->vc)) + pl08x_start_next_txd(plchan); + else + pl08x_phy_free(plchan); + } + spin_unlock(&plchan->vc.lock); + mask |= (1 << i); } } @@ -1654,16 +1688,10 @@ static irqreturn_t pl08x_irq(int irq, void *dev) static void pl08x_dma_slave_init(struct pl08x_dma_chan *chan) { - u32 cctl = pl08x_cctl(chan->cd->cctl); - chan->slave = true; chan->name = chan->cd->bus_id; - chan->src_addr = chan->cd->addr; - chan->dst_addr = chan->cd->addr; - chan->src_cctl = cctl | PL080_CONTROL_DST_INCR | - pl08x_select_bus(chan->cd->periph_buses, chan->host->mem_buses); - chan->dst_cctl = cctl | PL080_CONTROL_SRC_INCR | - pl08x_select_bus(chan->host->mem_buses, chan->cd->periph_buses); + chan->cfg.src_addr = chan->cd->addr; + chan->cfg.dst_addr = chan->cd->addr; } /* @@ -1693,6 +1721,7 @@ static int pl08x_dma_init_virtual_channels(struct pl08x_driver_data *pl08x, chan->host = pl08x; chan->state = PL08X_CHAN_IDLE; + chan->signal = -1; if (slave) { chan->cd = &pl08x->pd->slave_channels[i]; @@ -1705,26 +1734,12 @@ static int pl08x_dma_init_virtual_channels(struct pl08x_driver_data *pl08x, return -ENOMEM; } } - if (chan->cd->circular_buffer) { - dev_err(&pl08x->adev->dev, - "channel %s: circular buffers not supported\n", - chan->name); - kfree(chan); - continue; - } dev_dbg(&pl08x->adev->dev, "initialize virtual channel \"%s\"\n", chan->name); - chan->chan.device = dmadev; - dma_cookie_init(&chan->chan); - - spin_lock_init(&chan->lock); - INIT_LIST_HEAD(&chan->pend_list); - tasklet_init(&chan->tasklet, pl08x_tasklet, - (unsigned long) chan); - - list_add_tail(&chan->chan.device_node, &dmadev->channels); + chan->vc.desc_free = pl08x_desc_free; + vchan_init(&chan->vc, dmadev); } dev_info(&pl08x->adev->dev, "initialized %d virtual %s channels\n", i, slave ? "slave" : "memcpy"); @@ -1737,8 +1752,8 @@ static void pl08x_free_virtual_channels(struct dma_device *dmadev) struct pl08x_dma_chan *next; list_for_each_entry_safe(chan, - next, &dmadev->channels, chan.device_node) { - list_del(&chan->chan.device_node); + next, &dmadev->channels, vc.chan.device_node) { + list_del(&chan->vc.chan.device_node); kfree(chan); } } @@ -1791,7 +1806,7 @@ static int pl08x_debugfs_show(struct seq_file *s, void *data) seq_printf(s, "\nPL08x virtual memcpy channels:\n"); seq_printf(s, "CHANNEL:\tSTATE:\n"); seq_printf(s, "--------\t------\n"); - list_for_each_entry(chan, &pl08x->memcpy.channels, chan.device_node) { + list_for_each_entry(chan, &pl08x->memcpy.channels, vc.chan.device_node) { seq_printf(s, "%s\t\t%s\n", chan->name, pl08x_state_str(chan->state)); } @@ -1799,7 +1814,7 @@ static int pl08x_debugfs_show(struct seq_file *s, void *data) seq_printf(s, "\nPL08x virtual slave channels:\n"); seq_printf(s, "CHANNEL:\tSTATE:\n"); seq_printf(s, "--------\t------\n"); - list_for_each_entry(chan, &pl08x->slave.channels, chan.device_node) { + list_for_each_entry(chan, &pl08x->slave.channels, vc.chan.device_node) { seq_printf(s, "%s\t\t%s\n", chan->name, pl08x_state_str(chan->state)); } @@ -1851,9 +1866,6 @@ static int pl08x_probe(struct amba_device *adev, const struct amba_id *id) goto out_no_pl08x; } - pm_runtime_set_active(&adev->dev); - pm_runtime_enable(&adev->dev); - /* Initialize memcpy engine */ dma_cap_set(DMA_MEMCPY, pl08x->memcpy.cap_mask); pl08x->memcpy.dev = &adev->dev; @@ -1903,8 +1915,6 @@ static int pl08x_probe(struct amba_device *adev, const struct amba_id *id) goto out_no_lli_pool; } - spin_lock_init(&pl08x->lock); - pl08x->base = ioremap(adev->res.start, resource_size(&adev->res)); if (!pl08x->base) { ret = -ENOMEM; @@ -1942,7 +1952,6 @@ static int pl08x_probe(struct amba_device *adev, const struct amba_id *id) ch->id = i; ch->base = pl08x->base + PL080_Cx_BASE(i); spin_lock_init(&ch->lock); - ch->signal = -1; /* * Nomadik variants can have channels that are locked @@ -2007,7 +2016,6 @@ static int pl08x_probe(struct amba_device *adev, const struct amba_id *id) amba_part(adev), amba_rev(adev), (unsigned long long)adev->res.start, adev->irq[0]); - pm_runtime_put(&adev->dev); return 0; out_no_slave_reg: @@ -2026,9 +2034,6 @@ out_no_ioremap: dma_pool_destroy(pl08x->pool); out_no_lli_pool: out_no_platdata: - pm_runtime_put(&adev->dev); - pm_runtime_disable(&adev->dev); - kfree(pl08x); out_no_pl08x: amba_release_regions(adev); |