diff options
Diffstat (limited to 'drivers/dma/sh')
| -rw-r--r-- | drivers/dma/sh/Makefile | 2 | ||||
| -rw-r--r-- | drivers/dma/sh/shdma-base.c | 934 | ||||
| -rw-r--r-- | drivers/dma/sh/shdma.c | 943 | ||||
| -rw-r--r-- | drivers/dma/sh/shdma.h | 64 |
4 files changed, 1943 insertions, 0 deletions
diff --git a/drivers/dma/sh/Makefile b/drivers/dma/sh/Makefile new file mode 100644 index 000000000000..54ae9572b0ac --- /dev/null +++ b/drivers/dma/sh/Makefile @@ -0,0 +1,2 @@ +obj-$(CONFIG_SH_DMAE) += shdma-base.o +obj-$(CONFIG_SH_DMAE) += shdma.o diff --git a/drivers/dma/sh/shdma-base.c b/drivers/dma/sh/shdma-base.c new file mode 100644 index 000000000000..27f5c781fd73 --- /dev/null +++ b/drivers/dma/sh/shdma-base.c @@ -0,0 +1,934 @@ +/* + * Dmaengine driver base library for DMA controllers, found on SH-based SoCs + * + * extracted from shdma.c + * + * Copyright (C) 2011-2012 Guennadi Liakhovetski <g.liakhovetski@gmx.de> + * Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com> + * Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved. + * Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved. + * + * This is free software; you can redistribute it and/or modify + * it under the terms of version 2 of the GNU General Public License as + * published by the Free Software Foundation. + */ + +#include <linux/delay.h> +#include <linux/shdma-base.h> +#include <linux/dmaengine.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/pm_runtime.h> +#include <linux/slab.h> +#include <linux/spinlock.h> + +#include "../dmaengine.h" + +/* DMA descriptor control */ +enum shdma_desc_status { + DESC_IDLE, + DESC_PREPARED, + DESC_SUBMITTED, + DESC_COMPLETED, /* completed, have to call callback */ + DESC_WAITING, /* callback called, waiting for ack / re-submit */ +}; + +#define NR_DESCS_PER_CHANNEL 32 + +#define to_shdma_chan(c) container_of(c, struct shdma_chan, dma_chan) +#define to_shdma_dev(d) container_of(d, struct shdma_dev, dma_dev) + +/* + * For slave DMA we assume, that there is a finite number of DMA slaves in the + * system, and that each such slave can only use a finite number of channels. + * We use slave channel IDs to make sure, that no such slave channel ID is + * allocated more than once. + */ +static unsigned int slave_num = 256; +module_param(slave_num, uint, 0444); + +/* A bitmask with slave_num bits */ +static unsigned long *shdma_slave_used; + +/* Called under spin_lock_irq(&schan->chan_lock") */ +static void shdma_chan_xfer_ld_queue(struct shdma_chan *schan) +{ + struct shdma_dev *sdev = to_shdma_dev(schan->dma_chan.device); + const struct shdma_ops *ops = sdev->ops; + struct shdma_desc *sdesc; + + /* DMA work check */ + if (ops->channel_busy(schan)) + return; + + /* Find the first not transferred descriptor */ + list_for_each_entry(sdesc, &schan->ld_queue, node) + if (sdesc->mark == DESC_SUBMITTED) { + ops->start_xfer(schan, sdesc); + break; + } +} + +static dma_cookie_t shdma_tx_submit(struct dma_async_tx_descriptor *tx) +{ + struct shdma_desc *chunk, *c, *desc = + container_of(tx, struct shdma_desc, async_tx), + *last = desc; + struct shdma_chan *schan = to_shdma_chan(tx->chan); + dma_async_tx_callback callback = tx->callback; + dma_cookie_t cookie; + bool power_up; + + spin_lock_irq(&schan->chan_lock); + + power_up = list_empty(&schan->ld_queue); + + cookie = dma_cookie_assign(tx); + + /* Mark all chunks of this descriptor as submitted, move to the queue */ + list_for_each_entry_safe(chunk, c, desc->node.prev, node) { + /* + * All chunks are on the global ld_free, so, we have to find + * the end of the chain ourselves + */ + if (chunk != desc && (chunk->mark == DESC_IDLE || + chunk->async_tx.cookie > 0 || + chunk->async_tx.cookie == -EBUSY || + &chunk->node == &schan->ld_free)) + break; + chunk->mark = DESC_SUBMITTED; + /* Callback goes to the last chunk */ + chunk->async_tx.callback = NULL; + chunk->cookie = cookie; + list_move_tail(&chunk->node, &schan->ld_queue); + last = chunk; + + dev_dbg(schan->dev, "submit #%d@%p on %d\n", + tx->cookie, &last->async_tx, schan->id); + } + + last->async_tx.callback = callback; + last->async_tx.callback_param = tx->callback_param; + + if (power_up) { + int ret; + schan->pm_state = SHDMA_PM_BUSY; + + ret = pm_runtime_get(schan->dev); + + spin_unlock_irq(&schan->chan_lock); + if (ret < 0) + dev_err(schan->dev, "%s(): GET = %d\n", __func__, ret); + + pm_runtime_barrier(schan->dev); + + spin_lock_irq(&schan->chan_lock); + + /* Have we been reset, while waiting? */ + if (schan->pm_state != SHDMA_PM_ESTABLISHED) { + struct shdma_dev *sdev = + to_shdma_dev(schan->dma_chan.device); + const struct shdma_ops *ops = sdev->ops; + dev_dbg(schan->dev, "Bring up channel %d\n", + schan->id); + /* + * TODO: .xfer_setup() might fail on some platforms. + * Make it int then, on error remove chunks from the + * queue again + */ + ops->setup_xfer(schan, schan->slave_id); + + if (schan->pm_state == SHDMA_PM_PENDING) + shdma_chan_xfer_ld_queue(schan); + schan->pm_state = SHDMA_PM_ESTABLISHED; + } + } else { + /* + * Tell .device_issue_pending() not to run the queue, interrupts + * will do it anyway + */ + schan->pm_state = SHDMA_PM_PENDING; + } + + spin_unlock_irq(&schan->chan_lock); + + return cookie; +} + +/* Called with desc_lock held */ +static struct shdma_desc *shdma_get_desc(struct shdma_chan *schan) +{ + struct shdma_desc *sdesc; + + list_for_each_entry(sdesc, &schan->ld_free, node) + if (sdesc->mark != DESC_PREPARED) { + BUG_ON(sdesc->mark != DESC_IDLE); + list_del(&sdesc->node); + return sdesc; + } + + return NULL; +} + +static int shdma_setup_slave(struct shdma_chan *schan, int slave_id) +{ + struct shdma_dev *sdev = to_shdma_dev(schan->dma_chan.device); + const struct shdma_ops *ops = sdev->ops; + int ret; + + if (slave_id < 0 || slave_id >= slave_num) + return -EINVAL; + + if (test_and_set_bit(slave_id, shdma_slave_used)) + return -EBUSY; + + ret = ops->set_slave(schan, slave_id, false); + if (ret < 0) { + clear_bit(slave_id, shdma_slave_used); + return ret; + } + + schan->slave_id = slave_id; + + return 0; +} + +/* + * This is the standard shdma filter function to be used as a replacement to the + * "old" method, using the .private pointer. If for some reason you allocate a + * channel without slave data, use something like ERR_PTR(-EINVAL) as a filter + * parameter. If this filter is used, the slave driver, after calling + * dma_request_channel(), will also have to call dmaengine_slave_config() with + * .slave_id, .direction, and either .src_addr or .dst_addr set. + * NOTE: this filter doesn't support multiple DMAC drivers with the DMA_SLAVE + * capability! If this becomes a requirement, hardware glue drivers, using this + * services would have to provide their own filters, which first would check + * the device driver, similar to how other DMAC drivers, e.g., sa11x0-dma.c, do + * this, and only then, in case of a match, call this common filter. + */ +bool shdma_chan_filter(struct dma_chan *chan, void *arg) +{ + struct shdma_chan *schan = to_shdma_chan(chan); + struct shdma_dev *sdev = to_shdma_dev(schan->dma_chan.device); + const struct shdma_ops *ops = sdev->ops; + int slave_id = (int)arg; + int ret; + + if (slave_id < 0) + /* No slave requested - arbitrary channel */ + return true; + + if (slave_id >= slave_num) + return false; + + ret = ops->set_slave(schan, slave_id, true); + if (ret < 0) + return false; + + return true; +} +EXPORT_SYMBOL(shdma_chan_filter); + +static int shdma_alloc_chan_resources(struct dma_chan *chan) +{ + struct shdma_chan *schan = to_shdma_chan(chan); + struct shdma_dev *sdev = to_shdma_dev(schan->dma_chan.device); + const struct shdma_ops *ops = sdev->ops; + struct shdma_desc *desc; + struct shdma_slave *slave = chan->private; + int ret, i; + + /* + * This relies on the guarantee from dmaengine that alloc_chan_resources + * never runs concurrently with itself or free_chan_resources. + */ + if (slave) { + /* Legacy mode: .private is set in filter */ + ret = shdma_setup_slave(schan, slave->slave_id); + if (ret < 0) + goto esetslave; + } else { + schan->slave_id = -EINVAL; + } + + schan->desc = kcalloc(NR_DESCS_PER_CHANNEL, + sdev->desc_size, GFP_KERNEL); + if (!schan->desc) { + ret = -ENOMEM; + goto edescalloc; + } + schan->desc_num = NR_DESCS_PER_CHANNEL; + + for (i = 0; i < NR_DESCS_PER_CHANNEL; i++) { + desc = ops->embedded_desc(schan->desc, i); + dma_async_tx_descriptor_init(&desc->async_tx, + &schan->dma_chan); + desc->async_tx.tx_submit = shdma_tx_submit; + desc->mark = DESC_IDLE; + + list_add(&desc->node, &schan->ld_free); + } + + return NR_DESCS_PER_CHANNEL; + +edescalloc: + if (slave) +esetslave: + clear_bit(slave->slave_id, shdma_slave_used); + chan->private = NULL; + return ret; +} + +static dma_async_tx_callback __ld_cleanup(struct shdma_chan *schan, bool all) +{ + struct shdma_desc *desc, *_desc; + /* Is the "exposed" head of a chain acked? */ + bool head_acked = false; + dma_cookie_t cookie = 0; + dma_async_tx_callback callback = NULL; + void *param = NULL; + unsigned long flags; + + spin_lock_irqsave(&schan->chan_lock, flags); + list_for_each_entry_safe(desc, _desc, &schan->ld_queue, node) { + struct dma_async_tx_descriptor *tx = &desc->async_tx; + + BUG_ON(tx->cookie > 0 && tx->cookie != desc->cookie); + BUG_ON(desc->mark != DESC_SUBMITTED && + desc->mark != DESC_COMPLETED && + desc->mark != DESC_WAITING); + + /* + * queue is ordered, and we use this loop to (1) clean up all + * completed descriptors, and to (2) update descriptor flags of + * any chunks in a (partially) completed chain + */ + if (!all && desc->mark == DESC_SUBMITTED && + desc->cookie != cookie) + break; + + if (tx->cookie > 0) + cookie = tx->cookie; + + if (desc->mark == DESC_COMPLETED && desc->chunks == 1) { + if (schan->dma_chan.completed_cookie != desc->cookie - 1) + dev_dbg(schan->dev, + "Completing cookie %d, expected %d\n", + desc->cookie, + schan->dma_chan.completed_cookie + 1); + schan->dma_chan.completed_cookie = desc->cookie; + } + + /* Call callback on the last chunk */ + if (desc->mark == DESC_COMPLETED && tx->callback) { + desc->mark = DESC_WAITING; + callback = tx->callback; + param = tx->callback_param; + dev_dbg(schan->dev, "descriptor #%d@%p on %d callback\n", + tx->cookie, tx, schan->id); + BUG_ON(desc->chunks != 1); + break; + } + + if (tx->cookie > 0 || tx->cookie == -EBUSY) { + if (desc->mark == DESC_COMPLETED) { + BUG_ON(tx->cookie < 0); + desc->mark = DESC_WAITING; + } + head_acked = async_tx_test_ack(tx); + } else { + switch (desc->mark) { + case DESC_COMPLETED: + desc->mark = DESC_WAITING; + /* Fall through */ + case DESC_WAITING: + if (head_acked) + async_tx_ack(&desc->async_tx); + } + } + + dev_dbg(schan->dev, "descriptor %p #%d completed.\n", + tx, tx->cookie); + + if (((desc->mark == DESC_COMPLETED || + desc->mark == DESC_WAITING) && + async_tx_test_ack(&desc->async_tx)) || all) { + /* Remove from ld_queue list */ + desc->mark = DESC_IDLE; + + list_move(&desc->node, &schan->ld_free); + + if (list_empty(&schan->ld_queue)) { + dev_dbg(schan->dev, "Bring down channel %d\n", schan->id); + pm_runtime_put(schan->dev); + schan->pm_state = SHDMA_PM_ESTABLISHED; + } + } + } + + if (all && !callback) + /* + * Terminating and the loop completed normally: forgive + * uncompleted cookies + */ + schan->dma_chan.completed_cookie = schan->dma_chan.cookie; + + spin_unlock_irqrestore(&schan->chan_lock, flags); + + if (callback) + callback(param); + + return callback; +} + +/* + * shdma_chan_ld_cleanup - Clean up link descriptors + * + * Clean up the ld_queue of DMA channel. + */ +static void shdma_chan_ld_cleanup(struct shdma_chan *schan, bool all) +{ + while (__ld_cleanup(schan, all)) + ; +} + +/* + * shdma_free_chan_resources - Free all resources of the channel. + */ +static void shdma_free_chan_resources(struct dma_chan *chan) +{ + struct shdma_chan *schan = to_shdma_chan(chan); + struct shdma_dev *sdev = to_shdma_dev(chan->device); + const struct shdma_ops *ops = sdev->ops; + LIST_HEAD(list); + + /* Protect against ISR */ + spin_lock_irq(&schan->chan_lock); + ops->halt_channel(schan); + spin_unlock_irq(&schan->chan_lock); + + /* Now no new interrupts will occur */ + + /* Prepared and not submitted descriptors can still be on the queue */ + if (!list_empty(&schan->ld_queue)) + shdma_chan_ld_cleanup(schan, true); + + if (schan->slave_id >= 0) { + /* The caller is holding dma_list_mutex */ + clear_bit(schan->slave_id, shdma_slave_used); + chan->private = NULL; + } + + spin_lock_irq(&schan->chan_lock); + + list_splice_init(&schan->ld_free, &list); + schan->desc_num = 0; + + spin_unlock_irq(&schan->chan_lock); + + kfree(schan->desc); +} + +/** + * shdma_add_desc - get, set up and return one transfer descriptor + * @schan: DMA channel + * @flags: DMA transfer flags + * @dst: destination DMA address, incremented when direction equals + * DMA_DEV_TO_MEM or DMA_MEM_TO_MEM + * @src: source DMA address, incremented when direction equals + * DMA_MEM_TO_DEV or DMA_MEM_TO_MEM + * @len: DMA transfer length + * @first: if NULL, set to the current descriptor and cookie set to -EBUSY + * @direction: needed for slave DMA to decide which address to keep constant, + * equals DMA_MEM_TO_MEM for MEMCPY + * Returns 0 or an error + * Locks: called with desc_lock held + */ +static struct shdma_desc *shdma_add_desc(struct shdma_chan *schan, + unsigned long flags, dma_addr_t *dst, dma_addr_t *src, size_t *len, + struct shdma_desc **first, enum dma_transfer_direction direction) +{ + struct shdma_dev *sdev = to_shdma_dev(schan->dma_chan.device); + const struct shdma_ops *ops = sdev->ops; + struct shdma_desc *new; + size_t copy_size = *len; + + if (!copy_size) + return NULL; + + /* Allocate the link descriptor from the free list */ + new = shdma_get_desc(schan); + if (!new) { + dev_err(schan->dev, "No free link descriptor available\n"); + return NULL; + } + + ops->desc_setup(schan, new, *src, *dst, ©_size); + + if (!*first) { + /* First desc */ + new->async_tx.cookie = -EBUSY; + *first = new; + } else { + /* Other desc - invisible to the user */ + new->async_tx.cookie = -EINVAL; + } + + dev_dbg(schan->dev, + "chaining (%u/%u)@%x -> %x with %p, cookie %d\n", + copy_size, *len, *src, *dst, &new->async_tx, + new->async_tx.cookie); + + new->mark = DESC_PREPARED; + new->async_tx.flags = flags; + new->direction = direction; + + *len -= copy_size; + if (direction == DMA_MEM_TO_MEM || direction == DMA_MEM_TO_DEV) + *src += copy_size; + if (direction == DMA_MEM_TO_MEM || direction == DMA_DEV_TO_MEM) + *dst += copy_size; + + return new; +} + +/* + * shdma_prep_sg - prepare transfer descriptors from an SG list + * + * Common routine for public (MEMCPY) and slave DMA. The MEMCPY case is also + * converted to scatter-gather to guarantee consistent locking and a correct + * list manipulation. For slave DMA direction carries the usual meaning, and, + * logically, the SG list is RAM and the addr variable contains slave address, + * e.g., the FIFO I/O register. For MEMCPY direction equals DMA_MEM_TO_MEM + * and the SG list contains only one element and points at the source buffer. + */ +static struct dma_async_tx_descriptor *shdma_prep_sg(struct shdma_chan *schan, + struct scatterlist *sgl, unsigned int sg_len, dma_addr_t *addr, + enum dma_transfer_direction direction, unsigned long flags) +{ + struct scatterlist *sg; + struct shdma_desc *first = NULL, *new = NULL /* compiler... */; + LIST_HEAD(tx_list); + int chunks = 0; + unsigned long irq_flags; + int i; + + for_each_sg(sgl, sg, sg_len, i) + chunks += DIV_ROUND_UP(sg_dma_len(sg), schan->max_xfer_len); + + /* Have to lock the whole loop to protect against concurrent release */ + spin_lock_irqsave(&schan->chan_lock, irq_flags); + + /* + * Chaining: + * first descriptor is what user is dealing with in all API calls, its + * cookie is at first set to -EBUSY, at tx-submit to a positive + * number + * if more than one chunk is needed further chunks have cookie = -EINVAL + * the last chunk, if not equal to the first, has cookie = -ENOSPC + * all chunks are linked onto the tx_list head with their .node heads + * only during this function, then they are immediately spliced + * back onto the free list in form of a chain + */ + for_each_sg(sgl, sg, sg_len, i) { + dma_addr_t sg_addr = sg_dma_address(sg); + size_t len = sg_dma_len(sg); + + if (!len) + goto err_get_desc; + + do { + dev_dbg(schan->dev, "Add SG #%d@%p[%d], dma %llx\n", + i, sg, len, (unsigned long long)sg_addr); + + if (direction == DMA_DEV_TO_MEM) + new = shdma_add_desc(schan, flags, + &sg_addr, addr, &len, &first, + direction); + else + new = shdma_add_desc(schan, flags, + addr, &sg_addr, &len, &first, + direction); + if (!new) + goto err_get_desc; + + new->chunks = chunks--; + list_add_tail(&new->node, &tx_list); + } while (len); + } + + if (new != first) + new->async_tx.cookie = -ENOSPC; + + /* Put them back on the free list, so, they don't get lost */ + list_splice_tail(&tx_list, &schan->ld_free); + + spin_unlock_irqrestore(&schan->chan_lock, irq_flags); + + return &first->async_tx; + +err_get_desc: + list_for_each_entry(new, &tx_list, node) + new->mark = DESC_IDLE; + list_splice(&tx_list, &schan->ld_free); + + spin_unlock_irqrestore(&schan->chan_lock, irq_flags); + + return NULL; +} + +static struct dma_async_tx_descriptor *shdma_prep_memcpy( + struct dma_chan *chan, dma_addr_t dma_dest, dma_addr_t dma_src, + size_t len, unsigned long flags) +{ + struct shdma_chan *schan = to_shdma_chan(chan); + struct scatterlist sg; + + if (!chan || !len) + return NULL; + + BUG_ON(!schan->desc_num); + + sg_init_table(&sg, 1); + sg_set_page(&sg, pfn_to_page(PFN_DOWN(dma_src)), len, + offset_in_page(dma_src)); + sg_dma_address(&sg) = dma_src; + sg_dma_len(&sg) = len; + + return shdma_prep_sg(schan, &sg, 1, &dma_dest, DMA_MEM_TO_MEM, flags); +} + +static struct dma_async_tx_descriptor *shdma_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 shdma_chan *schan = to_shdma_chan(chan); + struct shdma_dev *sdev = to_shdma_dev(schan->dma_chan.device); + const struct shdma_ops *ops = sdev->ops; + int slave_id = schan->slave_id; + dma_addr_t slave_addr; + + if (!chan) + return NULL; + + BUG_ON(!schan->desc_num); + + /* Someone calling slave DMA on a generic channel? */ + if (slave_id < 0 || !sg_len) { + dev_warn(schan->dev, "%s: bad parameter: len=%d, id=%d\n", + __func__, sg_len, slave_id); + return NULL; + } + + slave_addr = ops->slave_addr(schan); + + return shdma_prep_sg(schan, sgl, sg_len, &slave_addr, + direction, flags); +} + +static int shdma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, + unsigned long arg) +{ + struct shdma_chan *schan = to_shdma_chan(chan); + struct shdma_dev *sdev = to_shdma_dev(chan->device); + const struct shdma_ops *ops = sdev->ops; + struct dma_slave_config *config; + unsigned long flags; + int ret; + + if (!chan) + return -EINVAL; + + switch (cmd) { + case DMA_TERMINATE_ALL: + spin_lock_irqsave(&schan->chan_lock, flags); + ops->halt_channel(schan); + spin_unlock_irqrestore(&schan->chan_lock, flags); + + shdma_chan_ld_cleanup(schan, true); + break; + case DMA_SLAVE_CONFIG: + /* + * So far only .slave_id is used, but the slave drivers are + * encouraged to also set a transfer direction and an address. + */ + if (!arg) + return -EINVAL; + /* + * We could lock this, but you shouldn't be configuring the + * channel, while using it... + */ + config = (struct dma_slave_config *)arg; + ret = shdma_setup_slave(schan, config->slave_id); + if (ret < 0) + return ret; + break; + default: + return -ENXIO; + } + + return 0; +} + +static void shdma_issue_pending(struct dma_chan *chan) +{ + struct shdma_chan *schan = to_shdma_chan(chan); + + spin_lock_irq(&schan->chan_lock); + if (schan->pm_state == SHDMA_PM_ESTABLISHED) + shdma_chan_xfer_ld_queue(schan); + else + schan->pm_state = SHDMA_PM_PENDING; + spin_unlock_irq(&schan->chan_lock); +} + +static enum dma_status shdma_tx_status(struct dma_chan *chan, + dma_cookie_t cookie, + struct dma_tx_state *txstate) +{ + struct shdma_chan *schan = to_shdma_chan(chan); + enum dma_status status; + unsigned long flags; + + shdma_chan_ld_cleanup(schan, false); + + spin_lock_irqsave(&schan->chan_lock, flags); + + status = dma_cookie_status(chan, cookie, txstate); + + /* + * If we don't find cookie on the queue, it has been aborted and we have + * to report error + */ + if (status != DMA_SUCCESS) { + struct shdma_desc *sdesc; + status = DMA_ERROR; + list_for_each_entry(sdesc, &schan->ld_queue, node) + if (sdesc->cookie == cookie) { + status = DMA_IN_PROGRESS; + break; + } + } + + spin_unlock_irqrestore(&schan->chan_lock, flags); + + return status; +} + +/* Called from error IRQ or NMI */ +bool shdma_reset(struct shdma_dev *sdev) +{ + const struct shdma_ops *ops = sdev->ops; + struct shdma_chan *schan; + unsigned int handled = 0; + int i; + + /* Reset all channels */ + shdma_for_each_chan(schan, sdev, i) { + struct shdma_desc *sdesc; + LIST_HEAD(dl); + + if (!schan) + continue; + + spin_lock(&schan->chan_lock); + + /* Stop the channel */ + ops->halt_channel(schan); + + list_splice_init(&schan->ld_queue, &dl); + + if (!list_empty(&dl)) { + dev_dbg(schan->dev, "Bring down channel %d\n", schan->id); + pm_runtime_put(schan->dev); + } + schan->pm_state = SHDMA_PM_ESTABLISHED; + + spin_unlock(&schan->chan_lock); + + /* Complete all */ + list_for_each_entry(sdesc, &dl, node) { + struct dma_async_tx_descriptor *tx = &sdesc->async_tx; + sdesc->mark = DESC_IDLE; + if (tx->callback) + tx->callback(tx->callback_param); + } + + spin_lock(&schan->chan_lock); + list_splice(&dl, &schan->ld_free); + spin_unlock(&schan->chan_lock); + + handled++; + } + + return !!handled; +} +EXPORT_SYMBOL(shdma_reset); + +static irqreturn_t chan_irq(int irq, void *dev) +{ + struct shdma_chan *schan = dev; + const struct shdma_ops *ops = + to_shdma_dev(schan->dma_chan.device)->ops; + irqreturn_t ret; + + spin_lock(&schan->chan_lock); + + ret = ops->chan_irq(schan, irq) ? IRQ_WAKE_THREAD : IRQ_NONE; + + spin_unlock(&schan->chan_lock); + + return ret; +} + +static irqreturn_t chan_irqt(int irq, void *dev) +{ + struct shdma_chan *schan = dev; + const struct shdma_ops *ops = + to_shdma_dev(schan->dma_chan.device)->ops; + struct shdma_desc *sdesc; + + spin_lock_irq(&schan->chan_lock); + list_for_each_entry(sdesc, &schan->ld_queue, node) { + if (sdesc->mark == DESC_SUBMITTED && + ops->desc_completed(schan, sdesc)) { + dev_dbg(schan->dev, "done #%d@%p\n", + sdesc->async_tx.cookie, &sdesc->async_tx); + sdesc->mark = DESC_COMPLETED; + break; + } + } + /* Next desc */ + shdma_chan_xfer_ld_queue(schan); + spin_unlock_irq(&schan->chan_lock); + + shdma_chan_ld_cleanup(schan, false); + + return IRQ_HANDLED; +} + +int shdma_request_irq(struct shdma_chan *schan, int irq, + unsigned long flags, const char *name) +{ + int ret = request_threaded_irq(irq, chan_irq, chan_irqt, + flags, name, schan); + + schan->irq = ret < 0 ? ret : irq; + + return ret; +} +EXPORT_SYMBOL(shdma_request_irq); + +void shdma_free_irq(struct shdma_chan *schan) +{ + if (schan->irq >= 0) + free_irq(schan->irq, schan); +} +EXPORT_SYMBOL(shdma_free_irq); + +void shdma_chan_probe(struct shdma_dev *sdev, + struct shdma_chan *schan, int id) +{ + schan->pm_state = SHDMA_PM_ESTABLISHED; + + /* reference struct dma_device */ + schan->dma_chan.device = &sdev->dma_dev; + dma_cookie_init(&schan->dma_chan); + + schan->dev = sdev->dma_dev.dev; + schan->id = id; + + if (!schan->max_xfer_len) + schan->max_xfer_len = PAGE_SIZE; + + spin_lock_init(&schan->chan_lock); + + /* Init descripter manage list */ + INIT_LIST_HEAD(&schan->ld_queue); + INIT_LIST_HEAD(&schan->ld_free); + + /* Add the channel to DMA device channel list */ + list_add_tail(&schan->dma_chan.device_node, + &sdev->dma_dev.channels); + sdev->schan[sdev->dma_dev.chancnt++] = schan; +} +EXPORT_SYMBOL(shdma_chan_probe); + +void shdma_chan_remove(struct shdma_chan *schan) +{ + list_del(&schan->dma_chan.device_node); +} +EXPORT_SYMBOL(shdma_chan_remove); + +int shdma_init(struct device *dev, struct shdma_dev *sdev, + int chan_num) +{ + struct dma_device *dma_dev = &sdev->dma_dev; + + /* + * Require all call-backs for now, they can trivially be made optional + * later as required + */ + if (!sdev->ops || + !sdev->desc_size || + !sdev->ops->embedded_desc || + !sdev->ops->start_xfer || + !sdev->ops->setup_xfer || + !sdev->ops->set_slave || + !sdev->ops->desc_setup || + !sdev->ops->slave_addr || + !sdev->ops->channel_busy || + !sdev->ops->halt_channel || + !sdev->ops->desc_completed) + return -EINVAL; + + sdev->schan = kcalloc(chan_num, sizeof(*sdev->schan), GFP_KERNEL); + if (!sdev->schan) + return -ENOMEM; + + INIT_LIST_HEAD(&dma_dev->channels); + + /* Common and MEMCPY operations */ + dma_dev->device_alloc_chan_resources + = shdma_alloc_chan_resources; + dma_dev->device_free_chan_resources = shdma_free_chan_resources; + dma_dev->device_prep_dma_memcpy = shdma_prep_memcpy; + dma_dev->device_tx_status = shdma_tx_status; + dma_dev->device_issue_pending = shdma_issue_pending; + + /* Compulsory for DMA_SLAVE fields */ + dma_dev->device_prep_slave_sg = shdma_prep_slave_sg; + dma_dev->device_control = shdma_control; + + dma_dev->dev = dev; + + return 0; +} +EXPORT_SYMBOL(shdma_init); + +void shdma_cleanup(struct shdma_dev *sdev) +{ + kfree(sdev->schan); +} +EXPORT_SYMBOL(shdma_cleanup); + +static int __init shdma_enter(void) +{ + shdma_slave_used = kzalloc(DIV_ROUND_UP(slave_num, BITS_PER_LONG) * + sizeof(long), GFP_KERNEL); + if (!shdma_slave_used) + return -ENOMEM; + return 0; +} +module_init(shdma_enter); + +static void __exit shdma_exit(void) +{ + kfree(shdma_slave_used); +} +module_exit(shdma_exit); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("SH-DMA driver base library"); +MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>"); diff --git a/drivers/dma/sh/shdma.c b/drivers/dma/sh/shdma.c new file mode 100644 index 000000000000..027c9be97654 --- /dev/null +++ b/drivers/dma/sh/shdma.c @@ -0,0 +1,943 @@ +/* + * Renesas SuperH DMA Engine support + * + * base is drivers/dma/flsdma.c + * + * Copyright (C) 2011-2012 Guennadi Liakhovetski <g.liakhovetski@gmx.de> + * Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com> + * Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved. + * Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved. + * + * This 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. + * + * - DMA of SuperH does not have Hardware DMA chain mode. + * - MAX DMA size is 16MB. + * + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/interrupt.h> +#include <linux/dmaengine.h> +#include <linux/delay.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/sh_dma.h> +#include <linux/notifier.h> +#include <linux/kdebug.h> +#include <linux/spinlock.h> +#include <linux/rculist.h> + +#include "../dmaengine.h" +#include "shdma.h" + +#define SH_DMAE_DRV_NAME "sh-dma-engine" + +/* Default MEMCPY transfer size = 2^2 = 4 bytes */ +#define LOG2_DEFAULT_XFER_SIZE 2 +#define SH_DMA_SLAVE_NUMBER 256 +#define SH_DMA_TCR_MAX (16 * 1024 * 1024 - 1) + +/* + * Used for write-side mutual exclusion for the global device list, + * read-side synchronization by way of RCU, and per-controller data. + */ +static DEFINE_SPINLOCK(sh_dmae_lock); +static LIST_HEAD(sh_dmae_devices); + +static void chclr_write(struct sh_dmae_chan *sh_dc, u32 data) +{ + struct sh_dmae_device *shdev = to_sh_dev(sh_dc); + + __raw_writel(data, shdev->chan_reg + + shdev->pdata->channel[sh_dc->shdma_chan.id].chclr_offset); +} + +static void sh_dmae_writel(struct sh_dmae_chan *sh_dc, u32 data, u32 reg) +{ + __raw_writel(data, sh_dc->base + reg / sizeof(u32)); +} + +static u32 sh_dmae_readl(struct sh_dmae_chan *sh_dc, u32 reg) +{ + return __raw_readl(sh_dc->base + reg / sizeof(u32)); +} + +static u16 dmaor_read(struct sh_dmae_device *shdev) +{ + u32 __iomem *addr = shdev->chan_reg + DMAOR / sizeof(u32); + + if (shdev->pdata->dmaor_is_32bit) + return __raw_readl(addr); + else + return __raw_readw(addr); +} + +static void dmaor_write(struct sh_dmae_device *shdev, u16 data) +{ + u32 __iomem *addr = shdev->chan_reg + DMAOR / sizeof(u32); + + if (shdev->pdata->dmaor_is_32bit) + __raw_writel(data, addr); + else + __raw_writew(data, addr); +} + +static void chcr_write(struct sh_dmae_chan *sh_dc, u32 data) +{ + struct sh_dmae_device *shdev = to_sh_dev(sh_dc); + + __raw_writel(data, sh_dc->base + shdev->chcr_offset / sizeof(u32)); +} + +static u32 chcr_read(struct sh_dmae_chan *sh_dc) +{ + struct sh_dmae_device *shdev = to_sh_dev(sh_dc); + + return __raw_readl(sh_dc->base + shdev->chcr_offset / sizeof(u32)); +} + +/* + * Reset DMA controller + * + * SH7780 has two DMAOR register + */ +static void sh_dmae_ctl_stop(struct sh_dmae_device *shdev) +{ + unsigned short dmaor; + unsigned long flags; + + spin_lock_irqsave(&sh_dmae_lock, flags); + + dmaor = dmaor_read(shdev); + dmaor_write(shdev, dmaor & ~(DMAOR_NMIF | DMAOR_AE | DMAOR_DME)); + + spin_unlock_irqrestore(&sh_dmae_lock, flags); +} + +static int sh_dmae_rst(struct sh_dmae_device *shdev) +{ + unsigned short dmaor; + unsigned long flags; + + spin_lock_irqsave(&sh_dmae_lock, flags); + + dmaor = dmaor_read(shdev) & ~(DMAOR_NMIF | DMAOR_AE | DMAOR_DME); + + if (shdev->pdata->chclr_present) { + int i; + for (i = 0; i < shdev->pdata->channel_num; i++) { + struct sh_dmae_chan *sh_chan = shdev->chan[i]; + if (sh_chan) + chclr_write(sh_chan, 0); + } + } + + dmaor_write(shdev, dmaor | shdev->pdata->dmaor_init); + + dmaor = dmaor_read(shdev); + + spin_unlock_irqrestore(&sh_dmae_lock, flags); + + if (dmaor & (DMAOR_AE | DMAOR_NMIF)) { + dev_warn(shdev->shdma_dev.dma_dev.dev, "Can't initialize DMAOR.\n"); + return -EIO; + } + if (shdev->pdata->dmaor_init & ~dmaor) + dev_warn(shdev->shdma_dev.dma_dev.dev, + "DMAOR=0x%x hasn't latched the initial value 0x%x.\n", + dmaor, shdev->pdata->dmaor_init); + return 0; +} + +static bool dmae_is_busy(struct sh_dmae_chan *sh_chan) +{ + u32 chcr = chcr_read(sh_chan); + + if ((chcr & (CHCR_DE | CHCR_TE)) == CHCR_DE) + return true; /* working */ + + return false; /* waiting */ +} + +static unsigned int calc_xmit_shift(struct sh_dmae_chan *sh_chan, u32 chcr) +{ + struct sh_dmae_device *shdev = to_sh_dev(sh_chan); + struct sh_dmae_pdata *pdata = shdev->pdata; + int cnt = ((chcr & pdata->ts_low_mask) >> pdata->ts_low_shift) | + ((chcr & pdata->ts_high_mask) >> pdata->ts_high_shift); + + if (cnt >= pdata->ts_shift_num) + cnt = 0; + + return pdata->ts_shift[cnt]; +} + +static u32 log2size_to_chcr(struct sh_dmae_chan *sh_chan, int l2size) +{ + struct sh_dmae_device *shdev = to_sh_dev(sh_chan); + struct sh_dmae_pdata *pdata = shdev->pdata; + int i; + + for (i = 0; i < pdata->ts_shift_num; i++) + if (pdata->ts_shift[i] == l2size) + break; + + if (i == pdata->ts_shift_num) + i = 0; + + return ((i << pdata->ts_low_shift) & pdata->ts_low_mask) | + ((i << pdata->ts_high_shift) & pdata->ts_high_mask); +} + +static void dmae_set_reg(struct sh_dmae_chan *sh_chan, struct sh_dmae_regs *hw) +{ + sh_dmae_writel(sh_chan, hw->sar, SAR); + sh_dmae_writel(sh_chan, hw->dar, DAR); + sh_dmae_writel(sh_chan, hw->tcr >> sh_chan->xmit_shift, TCR); +} + +static void dmae_start(struct sh_dmae_chan *sh_chan) +{ + struct sh_dmae_device *shdev = to_sh_dev(sh_chan); + u32 chcr = chcr_read(sh_chan); + + if (shdev->pdata->needs_tend_set) + sh_dmae_writel(sh_chan, 0xFFFFFFFF, TEND); + + chcr |= CHCR_DE | shdev->chcr_ie_bit; + chcr_write(sh_chan, chcr & ~CHCR_TE); +} + +static void dmae_init(struct sh_dmae_chan *sh_chan) +{ + /* + * Default configuration for dual address memory-memory transfer. + * 0x400 represents auto-request. + */ + u32 chcr = DM_INC | SM_INC | 0x400 | log2size_to_chcr(sh_chan, + LOG2_DEFAULT_XFER_SIZE); + sh_chan->xmit_shift = calc_xmit_shift(sh_chan, chcr); + chcr_write(sh_chan, chcr); +} + +static int dmae_set_chcr(struct sh_dmae_chan *sh_chan, u32 val) +{ + /* If DMA is active, cannot set CHCR. TODO: remove this superfluous check */ + if (dmae_is_busy(sh_chan)) + return -EBUSY; + + sh_chan->xmit_shift = calc_xmit_shift(sh_chan, val); + chcr_write(sh_chan, val); + + return 0; +} + +static int dmae_set_dmars(struct sh_dmae_chan *sh_chan, u16 val) +{ + struct sh_dmae_device *shdev = to_sh_dev(sh_chan); + struct sh_dmae_pdata *pdata = shdev->pdata; + const struct sh_dmae_channel *chan_pdata = &pdata->channel[sh_chan->shdma_chan.id]; + u16 __iomem *addr = shdev->dmars; + unsigned int shift = chan_pdata->dmars_bit; + + if (dmae_is_busy(sh_chan)) + return -EBUSY; + + if (pdata->no_dmars) + return 0; + + /* in the case of a missing DMARS resource use first memory window */ + if (!addr) + addr = (u16 __iomem *)shdev->chan_reg; + addr += chan_pdata->dmars / sizeof(u16); + + __raw_writew((__raw_readw(addr) & (0xff00 >> shift)) | (val << shift), + addr); + + return 0; +} + +static void sh_dmae_start_xfer(struct shdma_chan *schan, + struct shdma_desc *sdesc) +{ + struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan, + shdma_chan); + struct sh_dmae_desc *sh_desc = container_of(sdesc, + struct sh_dmae_desc, shdma_desc); + dev_dbg(sh_chan->shdma_chan.dev, "Queue #%d to %d: %u@%x -> %x\n", + sdesc->async_tx.cookie, sh_chan->shdma_chan.id, + sh_desc->hw.tcr, sh_desc->hw.sar, sh_desc->hw.dar); + /* Get the ld start address from ld_queue */ + dmae_set_reg(sh_chan, &sh_desc->hw); + dmae_start(sh_chan); +} + +static bool sh_dmae_channel_busy(struct shdma_chan *schan) +{ + struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan, + shdma_chan); + return dmae_is_busy(sh_chan); +} + +static void sh_dmae_setup_xfer(struct shdma_chan *schan, + int slave_id) +{ + struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan, + shdma_chan); + + if (slave_id >= 0) { + const struct sh_dmae_slave_config *cfg = + sh_chan->config; + + dmae_set_dmars(sh_chan, cfg->mid_rid); + dmae_set_chcr(sh_chan, cfg->chcr); + } else { + dmae_init(sh_chan); + } +} + +static const struct sh_dmae_slave_config *dmae_find_slave( + struct sh_dmae_chan *sh_chan, int slave_id) +{ + struct sh_dmae_device *shdev = to_sh_dev(sh_chan); + struct sh_dmae_pdata *pdata = shdev->pdata; + const struct sh_dmae_slave_config *cfg; + int i; + + if (slave_id >= SH_DMA_SLAVE_NUMBER) + return NULL; + + for (i = 0, cfg = pdata->slave; i < pdata->slave_num; i++, cfg++) + if (cfg->slave_id == slave_id) + return cfg; + + return NULL; +} + +static int sh_dmae_set_slave(struct shdma_chan *schan, + int slave_id, bool try) +{ + struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan, + shdma_chan); + const struct sh_dmae_slave_config *cfg = dmae_find_slave(sh_chan, slave_id); + if (!cfg) + return -ENODEV; + + if (!try) + sh_chan->config = cfg; + + return 0; +} + +static void dmae_halt(struct sh_dmae_chan *sh_chan) +{ + struct sh_dmae_device *shdev = to_sh_dev(sh_chan); + u32 chcr = chcr_read(sh_chan); + + chcr &= ~(CHCR_DE | CHCR_TE | shdev->chcr_ie_bit); + chcr_write(sh_chan, chcr); +} + +static int sh_dmae_desc_setup(struct shdma_chan *schan, + struct shdma_desc *sdesc, + dma_addr_t src, dma_addr_t dst, size_t *len) +{ + struct sh_dmae_desc *sh_desc = container_of(sdesc, + struct sh_dmae_desc, shdma_desc); + + if (*len > schan->max_xfer_len) + *len = schan->max_xfer_len; + + sh_desc->hw.sar = src; + sh_desc->hw.dar = dst; + sh_desc->hw.tcr = *len; + + return 0; +} + +static void sh_dmae_halt(struct shdma_chan *schan) +{ + struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan, + shdma_chan); + dmae_halt(sh_chan); +} + +static bool sh_dmae_chan_irq(struct shdma_chan *schan, int irq) +{ + struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan, + shdma_chan); + + if (!(chcr_read(sh_chan) & CHCR_TE)) + return false; + + /* DMA stop */ + dmae_halt(sh_chan); + + return true; +} + +/* Called from error IRQ or NMI */ +static bool sh_dmae_reset(struct sh_dmae_device *shdev) +{ + bool ret; + + /* halt the dma controller */ + sh_dmae_ctl_stop(shdev); + + /* We cannot detect, which channel caused the error, have to reset all */ + ret = shdma_reset(&shdev->shdma_dev); + + sh_dmae_rst(shdev); + + return ret; +} + +static irqreturn_t sh_dmae_err(int irq, void *data) +{ + struct sh_dmae_device *shdev = data; + + if (!(dmaor_read(shdev) & DMAOR_AE)) + return IRQ_NONE; + + sh_dmae_reset(shdev); + return IRQ_HANDLED; +} + +static bool sh_dmae_desc_completed(struct shdma_chan *schan, + struct shdma_desc *sdesc) +{ + struct sh_dmae_chan *sh_chan = container_of(schan, + struct sh_dmae_chan, shdma_chan); + struct sh_dmae_desc *sh_desc = container_of(sdesc, + struct sh_dmae_desc, shdma_desc); + u32 sar_buf = sh_dmae_readl(sh_chan, SAR); + u32 dar_buf = sh_dmae_readl(sh_chan, DAR); + + return (sdesc->direction == DMA_DEV_TO_MEM && + (sh_desc->hw.dar + sh_desc->hw.tcr) == dar_buf) || + (sdesc->direction != DMA_DEV_TO_MEM && + (sh_desc->hw.sar + sh_desc->hw.tcr) == sar_buf); +} + +static bool sh_dmae_nmi_notify(struct sh_dmae_device *shdev) +{ + /* Fast path out if NMIF is not asserted for this controller */ + if ((dmaor_read(shdev) & DMAOR_NMIF) == 0) + return false; + + return sh_dmae_reset(shdev); +} + +static int sh_dmae_nmi_handler(struct notifier_block *self, + unsigned long cmd, void *data) +{ + struct sh_dmae_device *shdev; + int ret = NOTIFY_DONE; + bool triggered; + + /* + * Only concern ourselves with NMI events. + * + * Normally we would check the die chain value, but as this needs + * to be architecture independent, check for NMI context instead. + */ + if (!in_nmi()) + return NOTIFY_DONE; + + rcu_read_lock(); + list_for_each_entry_rcu(shdev, &sh_dmae_devices, node) { + /* + * Only stop if one of the controllers has NMIF asserted, + * we do not want to interfere with regular address error + * handling or NMI events that don't concern the DMACs. + */ + triggered = sh_dmae_nmi_notify(shdev); + if (triggered == true) + ret = NOTIFY_OK; + } + rcu_read_unlock(); + + return ret; +} + +static struct notifier_block sh_dmae_nmi_notifier __read_mostly = { + .notifier_call = sh_dmae_nmi_handler, + + /* Run before NMI debug handler and KGDB */ + .priority = 1, +}; + +static int __devinit sh_dmae_chan_probe(struct sh_dmae_device *shdev, int id, + int irq, unsigned long flags) +{ + const struct sh_dmae_channel *chan_pdata = &shdev->pdata->channel[id]; + struct shdma_dev *sdev = &shdev->shdma_dev; + struct platform_device *pdev = to_platform_device(sdev->dma_dev.dev); + struct sh_dmae_chan *sh_chan; + struct shdma_chan *schan; + int err; + + sh_chan = kzalloc(sizeof(struct sh_dmae_chan), GFP_KERNEL); + if (!sh_chan) { + dev_err(sdev->dma_dev.dev, + "No free memory for allocating dma channels!\n"); + return -ENOMEM; + } + + schan = &sh_chan->shdma_chan; + schan->max_xfer_len = SH_DMA_TCR_MAX + 1; + + shdma_chan_probe(sdev, schan, id); + + sh_chan->base = shdev->chan_reg + chan_pdata->offset / sizeof(u32); + + /* set up channel irq */ + if (pdev->id >= 0) + snprintf(sh_chan->dev_id, sizeof(sh_chan->dev_id), + "sh-dmae%d.%d", pdev->id, id); + else + snprintf(sh_chan->dev_id, sizeof(sh_chan->dev_id), + "sh-dma%d", id); + + err = shdma_request_irq(schan, irq, flags, sh_chan->dev_id); + if (err) { + dev_err(sdev->dma_dev.dev, + "DMA channel %d request_irq error %d\n", + id, err); + goto err_no_irq; + } + + shdev->chan[id] = sh_chan; + return 0; + +err_no_irq: + /* remove from dmaengine device node */ + shdma_chan_remove(schan); + kfree(sh_chan); + return err; +} + +static void sh_dmae_chan_remove(struct sh_dmae_device *shdev) +{ + struct dma_device *dma_dev = &shdev->shdma_dev.dma_dev; + struct shdma_chan *schan; + int i; + + shdma_for_each_chan(schan, &shdev->shdma_dev, i) { + struct sh_dmae_chan *sh_chan = container_of(schan, + struct sh_dmae_chan, shdma_chan); + BUG_ON(!schan); + + shdma_free_irq(&sh_chan->shdma_chan); + + shdma_chan_remove(schan); + kfree(sh_chan); + } + dma_dev->chancnt = 0; +} + +static void sh_dmae_shutdown(struct platform_device *pdev) +{ + struct sh_dmae_device *shdev = platform_get_drvdata(pdev); + sh_dmae_ctl_stop(shdev); +} + +static int sh_dmae_runtime_suspend(struct device *dev) +{ + return 0; +} + +static int sh_dmae_runtime_resume(struct device *dev) +{ + struct sh_dmae_device *shdev = dev_get_drvdata(dev); + + return sh_dmae_rst(shdev); +} + +#ifdef CONFIG_PM +static int sh_dmae_suspend(struct device *dev) +{ + return 0; +} + +static int sh_dmae_resume(struct device *dev) +{ + struct sh_dmae_device *shdev = dev_get_drvdata(dev); + int i, ret; + + ret = sh_dmae_rst(shdev); + if (ret < 0) + dev_err(dev, "Failed to reset!\n"); + + for (i = 0; i < shdev->pdata->channel_num; i++) { + struct sh_dmae_chan *sh_chan = shdev->chan[i]; + + if (!sh_chan->shdma_chan.desc_num) + continue; + + if (sh_chan->shdma_chan.slave_id >= 0) { + const struct sh_dmae_slave_config *cfg = sh_chan->config; + dmae_set_dmars(sh_chan, cfg->mid_rid); + dmae_set_chcr(sh_chan, cfg->chcr); + } else { + dmae_init(sh_chan); + } + } + + return 0; +} +#else +#define sh_dmae_suspend NULL +#define sh_dmae_resume NULL +#endif + +const struct dev_pm_ops sh_dmae_pm = { + .suspend = sh_dmae_suspend, + .resume = sh_dmae_resume, + .runtime_suspend = sh_dmae_runtime_suspend, + .runtime_resume = sh_dmae_runtime_resume, +}; + +static dma_addr_t sh_dmae_slave_addr(struct shdma_chan *schan) +{ + struct sh_dmae_chan *sh_chan = container_of(schan, + struct sh_dmae_chan, shdma_chan); + + /* + * Implicit BUG_ON(!sh_chan->config) + * This is an exclusive slave DMA operation, may only be called after a + * successful slave configuration. + */ + return sh_chan->config->addr; +} + +static struct shdma_desc *sh_dmae_embedded_desc(void *buf, int i) +{ + return &((struct sh_dmae_desc *)buf)[i].shdma_desc; +} + +static const struct shdma_ops sh_dmae_shdma_ops = { + .desc_completed = sh_dmae_desc_completed, + .halt_channel = sh_dmae_halt, + .channel_busy = sh_dmae_channel_busy, + .slave_addr = sh_dmae_slave_addr, + .desc_setup = sh_dmae_desc_setup, + .set_slave = sh_dmae_set_slave, + .setup_xfer = sh_dmae_setup_xfer, + .start_xfer = sh_dmae_start_xfer, + .embedded_desc = sh_dmae_embedded_desc, + .chan_irq = sh_dmae_chan_irq, +}; + +static int __devinit sh_dmae_probe(struct platform_device *pdev) +{ + struct sh_dmae_pdata *pdata = pdev->dev.platform_data; + unsigned long irqflags = IRQF_DISABLED, + chan_flag[SH_DMAE_MAX_CHANNELS] = {}; + int errirq, chan_irq[SH_DMAE_MAX_CHANNELS]; + int err, i, irq_cnt = 0, irqres = 0, irq_cap = 0; + struct sh_dmae_device *shdev; + struct dma_device *dma_dev; + struct resource *chan, *dmars, *errirq_res, *chanirq_res; + + /* get platform data */ + if (!pdata || !pdata->channel_num) + return -ENODEV; + + chan = platform_get_resource(pdev, IORESOURCE_MEM, 0); + /* DMARS area is optional */ + dmars = platform_get_resource(pdev, IORESOURCE_MEM, 1); + /* + * IRQ resources: + * 1. there always must be at least one IRQ IO-resource. On SH4 it is + * the error IRQ, in which case it is the only IRQ in this resource: + * start == end. If it is the only IRQ resource, all channels also + * use the same IRQ. + * 2. DMA channel IRQ resources can be specified one per resource or in + * ranges (start != end) + * 3. iff all events (channels and, optionally, error) on this + * controller use the same IRQ, only one IRQ resource can be + * specified, otherwise there must be one IRQ per channel, even if + * some of them are equal + * 4. if all IRQs on this controller are equal or if some specific IRQs + * specify IORESOURCE_IRQ_SHAREABLE in their resources, they will be + * requested with the IRQF_SHARED flag + */ + errirq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); + if (!chan || !errirq_res) + return -ENODEV; + + if (!request_mem_region(chan->start, resource_size(chan), pdev->name)) { + dev_err(&pdev->dev, "DMAC register region already claimed\n"); + return -EBUSY; + } + + if (dmars && !request_mem_region(dmars->start, resource_size(dmars), pdev->name)) { + dev_err(&pdev->dev, "DMAC DMARS region already claimed\n"); + err = -EBUSY; + goto ermrdmars; + } + + err = -ENOMEM; + shdev = kzalloc(sizeof(struct sh_dmae_device), GFP_KERNEL); + if (!shdev) { + dev_err(&pdev->dev, "Not enough memory\n"); + goto ealloc; + } + + dma_dev = &shdev->shdma_dev.dma_dev; + + shdev->chan_reg = ioremap(chan->start, resource_size(chan)); + if (!shdev->chan_reg) + goto emapchan; + if (dmars) { + shdev->dmars = ioremap(dmars->start, resource_size(dmars)); + if (!shdev->dmars) + goto emapdmars; + } + + if (!pdata->slave_only) + dma_cap_set(DMA_MEMCPY, dma_dev->cap_mask); + if (pdata->slave && pdata->slave_num) + dma_cap_set(DMA_SLAVE, dma_dev->cap_mask); + + /* Default transfer size of 32 bytes requires 32-byte alignment */ + dma_dev->copy_align = LOG2_DEFAULT_XFER_SIZE; + + shdev->shdma_dev.ops = &sh_dmae_shdma_ops; + shdev->shdma_dev.desc_size = sizeof(struct sh_dmae_desc); + err = shdma_init(&pdev->dev, &shdev->shdma_dev, + pdata->channel_num); + if (err < 0) + goto eshdma; + + /* platform data */ + shdev->pdata = pdev->dev.platform_data; + + if (pdata->chcr_offset) + shdev->chcr_offset = pdata->chcr_offset; + else + shdev->chcr_offset = CHCR; + + if (pdata->chcr_ie_bit) + shdev->chcr_ie_bit = pdata->chcr_ie_bit; + else + shdev->chcr_ie_bit = CHCR_IE; + + platform_set_drvdata(pdev, shdev); + + pm_runtime_enable(&pdev->dev); + err = pm_runtime_get_sync(&pdev->dev); + if (err < 0) + dev_err(&pdev->dev, "%s(): GET = %d\n", __func__, err); + + spin_lock_irq(&sh_dmae_lock); + list_add_tail_rcu(&shdev->node, &sh_dmae_devices); + spin_unlock_irq(&sh_dmae_lock); + + /* reset dma controller - only needed as a test */ + err = sh_dmae_rst(shdev); + if (err) + goto rst_err; + +#if defined(CONFIG_CPU_SH4) || defined(CONFIG_ARCH_SHMOBILE) + chanirq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 1); + + if (!chanirq_res) + chanirq_res = errirq_res; + else + irqres++; + + if (chanirq_res == errirq_res || + (errirq_res->flags & IORESOURCE_BITS) == IORESOURCE_IRQ_SHAREABLE) + irqflags = IRQF_SHARED; + + errirq = errirq_res->start; + + err = request_irq(errirq, sh_dmae_err, irqflags, + "DMAC Address Error", shdev); + if (err) { + dev_err(&pdev->dev, + "DMA failed requesting irq #%d, error %d\n", + errirq, err); + goto eirq_err; + } + +#else + chanirq_res = errirq_res; +#endif /* CONFIG_CPU_SH4 || CONFIG_ARCH_SHMOBILE */ + + if (chanirq_res->start == chanirq_res->end && + !platform_get_resource(pdev, IORESOURCE_IRQ, 1)) { + /* Special case - all multiplexed */ + for (; irq_cnt < pdata->channel_num; irq_cnt++) { + if (irq_cnt < SH_DMAE_MAX_CHANNELS) { + chan_irq[irq_cnt] = chanirq_res->start; + chan_flag[irq_cnt] = IRQF_SHARED; + } else { + irq_cap = 1; + break; + } + } + } else { + do { + for (i = chanirq_res->start; i <= chanirq_res->end; i++) { + if (irq_cnt >= SH_DMAE_MAX_CHANNELS) { + irq_cap = 1; + break; + } + + if ((errirq_res->flags & IORESOURCE_BITS) == + IORESOURCE_IRQ_SHAREABLE) + chan_flag[irq_cnt] = IRQF_SHARED; + else + chan_flag[irq_cnt] = IRQF_DISABLED; + dev_dbg(&pdev->dev, + "Found IRQ %d for channel %d\n", + i, irq_cnt); + chan_irq[irq_cnt++] = i; + } + + if (irq_cnt >= SH_DMAE_MAX_CHANNELS) + break; + + chanirq_res = platform_get_resource(pdev, + IORESOURCE_IRQ, ++irqres); + } while (irq_cnt < pdata->channel_num && chanirq_res); + } + + /* Create DMA Channel */ + for (i = 0; i < irq_cnt; i++) { + err = sh_dmae_chan_probe(shdev, i, chan_irq[i], chan_flag[i]); + if (err) + goto chan_probe_err; + } + + if (irq_cap) + dev_notice(&pdev->dev, "Attempting to register %d DMA " + "channels when a maximum of %d are supported.\n", + pdata->channel_num, SH_DMAE_MAX_CHANNELS); + + pm_runtime_put(&pdev->dev); + + err = dma_async_device_register(&shdev->shdma_dev.dma_dev); + if (err < 0) + goto edmadevreg; + + return err; + +edmadevreg: + pm_runtime_get(&pdev->dev); + +chan_probe_err: + sh_dmae_chan_remove(shdev); + +#if defined(CONFIG_CPU_SH4) || defined(CONFIG_ARCH_SHMOBILE) + free_irq(errirq, shdev); +eirq_err: +#endif +rst_err: + spin_lock_irq(&sh_dmae_lock); + list_del_rcu(&shdev->node); + spin_unlock_irq(&sh_dmae_lock); + + pm_runtime_put(&pdev->dev); + pm_runtime_disable(&pdev->dev); + + platform_set_drvdata(pdev, NULL); + shdma_cleanup(&shdev->shdma_dev); +eshdma: + if (dmars) + iounmap(shdev->dmars); +emapdmars: + iounmap(shdev->chan_reg); + synchronize_rcu(); +emapchan: + kfree(shdev); +ealloc: + if (dmars) + release_mem_region(dmars->start, resource_size(dmars)); +ermrdmars: + release_mem_region(chan->start, resource_size(chan)); + + return err; +} + +static int __devexit sh_dmae_remove(struct platform_device *pdev) +{ + struct sh_dmae_device *shdev = platform_get_drvdata(pdev); + struct dma_device *dma_dev = &shdev->shdma_dev.dma_dev; + struct resource *res; + int errirq = platform_get_irq(pdev, 0); + + dma_async_device_unregister(dma_dev); + + if (errirq > 0) + free_irq(errirq, shdev); + + spin_lock_irq(&sh_dmae_lock); + list_del_rcu(&shdev->node); + spin_unlock_irq(&sh_dmae_lock); + + pm_runtime_disable(&pdev->dev); + + sh_dmae_chan_remove(shdev); + shdma_cleanup(&shdev->shdma_dev); + + if (shdev->dmars) + iounmap(shdev->dmars); + iounmap(shdev->chan_reg); + + platform_set_drvdata(pdev, NULL); + + synchronize_rcu(); + kfree(shdev); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (res) + release_mem_region(res->start, resource_size(res)); + res = platform_get_resource(pdev, IORESOURCE_MEM, 1); + if (res) + release_mem_region(res->start, resource_size(res)); + + return 0; +} + +static struct platform_driver sh_dmae_driver = { + .driver = { + .owner = THIS_MODULE, + .pm = &sh_dmae_pm, + .name = SH_DMAE_DRV_NAME, + }, + .remove = __devexit_p(sh_dmae_remove), + .shutdown = sh_dmae_shutdown, +}; + +static int __init sh_dmae_init(void) +{ + /* Wire up NMI handling */ + int err = register_die_notifier(&sh_dmae_nmi_notifier); + if (err) + return err; + + return platform_driver_probe(&sh_dmae_driver, sh_dmae_probe); +} +module_init(sh_dmae_init); + +static void __exit sh_dmae_exit(void) +{ + platform_driver_unregister(&sh_dmae_driver); + + unregister_die_notifier(&sh_dmae_nmi_notifier); +} +module_exit(sh_dmae_exit); + +MODULE_AUTHOR("Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>"); +MODULE_DESCRIPTION("Renesas SH DMA Engine driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:" SH_DMAE_DRV_NAME); diff --git a/drivers/dma/sh/shdma.h b/drivers/dma/sh/shdma.h new file mode 100644 index 000000000000..9314e93225db --- /dev/null +++ b/drivers/dma/sh/shdma.h @@ -0,0 +1,64 @@ +/* + * Renesas SuperH DMA Engine support + * + * Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com> + * Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved. + * + * This 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. + * + */ +#ifndef __DMA_SHDMA_H +#define __DMA_SHDMA_H + +#include <linux/sh_dma.h> +#include <linux/shdma-base.h> +#include <linux/dmaengine.h> +#include <linux/interrupt.h> +#include <linux/list.h> + +#define SH_DMAE_MAX_CHANNELS 20 +#define SH_DMAE_TCR_MAX 0x00FFFFFF /* 16MB */ + +struct device; + +struct sh_dmae_chan { + struct shdma_chan shdma_chan; + const struct sh_dmae_slave_config *config; /* Slave DMA configuration */ + int xmit_shift; /* log_2(bytes_per_xfer) */ + u32 __iomem *base; + char dev_id[16]; /* unique name per DMAC of channel */ + int pm_error; +}; + +struct sh_dmae_device { + struct shdma_dev shdma_dev; + struct sh_dmae_chan *chan[SH_DMAE_MAX_CHANNELS]; + struct sh_dmae_pdata *pdata; + struct list_head node; + u32 __iomem *chan_reg; + u16 __iomem *dmars; + unsigned int chcr_offset; + u32 chcr_ie_bit; +}; + +struct sh_dmae_regs { + u32 sar; /* SAR / source address */ + u32 dar; /* DAR / destination address */ + u32 tcr; /* TCR / transfer count */ +}; + +struct sh_dmae_desc { + struct sh_dmae_regs hw; + struct shdma_desc shdma_desc; +}; + +#define to_sh_chan(chan) container_of(chan, struct sh_dmae_chan, shdma_chan) +#define to_sh_desc(lh) container_of(lh, struct sh_desc, node) +#define tx_to_sh_desc(tx) container_of(tx, struct sh_desc, async_tx) +#define to_sh_dev(chan) container_of(chan->shdma_chan.dma_chan.device,\ + struct sh_dmae_device, shdma_dev.dma_dev) + +#endif /* __DMA_SHDMA_H */ |