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Diffstat (limited to 'drivers/dma/ste_dma40.c')
-rw-r--r--drivers/dma/ste_dma40.c860
1 files changed, 532 insertions, 328 deletions
diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
index c426829f6ab8..17e2600a00cf 100644
--- a/drivers/dma/ste_dma40.c
+++ b/drivers/dma/ste_dma40.c
@@ -30,14 +30,16 @@
/* Maximum iterations taken before giving up suspending a channel */
#define D40_SUSPEND_MAX_IT 500
+/* Hardware requirement on LCLA alignment */
+#define LCLA_ALIGNMENT 0x40000
+/* Attempts before giving up to trying to get pages that are aligned */
+#define MAX_LCLA_ALLOC_ATTEMPTS 256
+
+/* Bit markings for allocation map */
#define D40_ALLOC_FREE (1 << 31)
#define D40_ALLOC_PHY (1 << 30)
#define D40_ALLOC_LOG_FREE 0
-/* The number of free d40_desc to keep in memory before starting
- * to kfree() them */
-#define D40_DESC_CACHE_SIZE 50
-
/* Hardware designer of the block */
#define D40_PERIPHID2_DESIGNER 0x8
@@ -68,9 +70,9 @@ enum d40_command {
*/
struct d40_lli_pool {
void *base;
- int size;
+ int size;
/* Space for dst and src, plus an extra for padding */
- u8 pre_alloc_lli[3 * sizeof(struct d40_phy_lli)];
+ u8 pre_alloc_lli[3 * sizeof(struct d40_phy_lli)];
};
/**
@@ -81,9 +83,10 @@ struct d40_lli_pool {
* lli_len equals one.
* @lli_log: Same as above but for logical channels.
* @lli_pool: The pool with two entries pre-allocated.
- * @lli_len: Number of LLI's in lli_pool
- * @lli_tcount: Number of LLIs processed in the transfer. When equals lli_len
- * then this transfer job is done.
+ * @lli_len: Number of llis of current descriptor.
+ * @lli_count: Number of transfered llis.
+ * @lli_tx_len: Max number of LLIs per transfer, there can be
+ * many transfer for one descriptor.
* @txd: DMA engine struct. Used for among other things for communication
* during a transfer.
* @node: List entry.
@@ -100,8 +103,9 @@ struct d40_desc {
struct d40_log_lli_bidir lli_log;
struct d40_lli_pool lli_pool;
- u32 lli_len;
- u32 lli_tcount;
+ int lli_len;
+ int lli_count;
+ u32 lli_tx_len;
struct dma_async_tx_descriptor txd;
struct list_head node;
@@ -113,18 +117,20 @@ struct d40_desc {
/**
* struct d40_lcla_pool - LCLA pool settings and data.
*
- * @base: The virtual address of LCLA.
- * @phy: Physical base address of LCLA.
- * @base_size: size of lcla.
+ * @base: The virtual address of LCLA. 18 bit aligned.
+ * @base_unaligned: The orignal kmalloc pointer, if kmalloc is used.
+ * This pointer is only there for clean-up on error.
+ * @pages: The number of pages needed for all physical channels.
+ * Only used later for clean-up on error
* @lock: Lock to protect the content in this struct.
- * @alloc_map: Mapping between physical channel and LCLA entries.
+ * @alloc_map: Bitmap mapping between physical channel and LCLA entries.
* @num_blocks: The number of entries of alloc_map. Equals to the
* number of physical channels.
*/
struct d40_lcla_pool {
void *base;
- dma_addr_t phy;
- resource_size_t base_size;
+ void *base_unaligned;
+ int pages;
spinlock_t lock;
u32 *alloc_map;
int num_blocks;
@@ -163,15 +169,14 @@ struct d40_base;
* @pending_tx: The number of pending transfers. Used between interrupt handler
* and tasklet.
* @busy: Set to true when transfer is ongoing on this channel.
- * @phy_chan: Pointer to physical channel which this instance runs on.
+ * @phy_chan: Pointer to physical channel which this instance runs on. If this
+ * point is NULL, then the channel is not allocated.
* @chan: DMA engine handle.
* @tasklet: Tasklet that gets scheduled from interrupt context to complete a
* transfer and call client callback.
* @client: Cliented owned descriptor list.
* @active: Active descriptor.
* @queue: Queued jobs.
- * @free: List of free descripts, ready to be reused.
- * @free_len: Number of descriptors in the free list.
* @dma_cfg: The client configuration of this dma channel.
* @base: Pointer to the device instance struct.
* @src_def_cfg: Default cfg register setting for src.
@@ -195,8 +200,6 @@ struct d40_chan {
struct list_head client;
struct list_head active;
struct list_head queue;
- struct list_head free;
- int free_len;
struct stedma40_chan_cfg dma_cfg;
struct d40_base *base;
/* Default register configurations */
@@ -205,6 +208,9 @@ struct d40_chan {
struct d40_def_lcsp log_def;
struct d40_lcla_elem lcla;
struct d40_log_lli_full *lcpa;
+ /* Runtime reconfiguration */
+ dma_addr_t runtime_addr;
+ enum dma_data_direction runtime_direction;
};
/**
@@ -215,6 +221,7 @@ struct d40_chan {
* the same physical register.
* @dev: The device structure.
* @virtbase: The virtual base address of the DMA's register.
+ * @rev: silicon revision detected.
* @clk: Pointer to the DMA clock structure.
* @phy_start: Physical memory start of the DMA registers.
* @phy_size: Size of the DMA register map.
@@ -240,12 +247,14 @@ struct d40_chan {
* @lcpa_base: The virtual mapped address of LCPA.
* @phy_lcpa: The physical address of the LCPA.
* @lcpa_size: The size of the LCPA area.
+ * @desc_slab: cache for descriptors.
*/
struct d40_base {
spinlock_t interrupt_lock;
spinlock_t execmd_lock;
struct device *dev;
void __iomem *virtbase;
+ u8 rev:4;
struct clk *clk;
phys_addr_t phy_start;
resource_size_t phy_size;
@@ -266,6 +275,7 @@ struct d40_base {
void *lcpa_base;
dma_addr_t phy_lcpa;
resource_size_t lcpa_size;
+ struct kmem_cache *desc_slab;
};
/**
@@ -365,11 +375,6 @@ static dma_cookie_t d40_assign_cookie(struct d40_chan *d40c,
return cookie;
}
-static void d40_desc_reset(struct d40_desc *d40d)
-{
- d40d->lli_tcount = 0;
-}
-
static void d40_desc_remove(struct d40_desc *d40d)
{
list_del(&d40d->node);
@@ -377,7 +382,6 @@ static void d40_desc_remove(struct d40_desc *d40d)
static struct d40_desc *d40_desc_get(struct d40_chan *d40c)
{
- struct d40_desc *desc;
struct d40_desc *d;
struct d40_desc *_d;
@@ -386,36 +390,21 @@ static struct d40_desc *d40_desc_get(struct d40_chan *d40c)
if (async_tx_test_ack(&d->txd)) {
d40_pool_lli_free(d);
d40_desc_remove(d);
- desc = d;
- goto out;
+ break;
}
- }
-
- if (list_empty(&d40c->free)) {
- /* Alloc new desc because we're out of used ones */
- desc = kzalloc(sizeof(struct d40_desc), GFP_NOWAIT);
- if (desc == NULL)
- goto out;
- INIT_LIST_HEAD(&desc->node);
} else {
- /* Reuse an old desc. */
- desc = list_first_entry(&d40c->free,
- struct d40_desc,
- node);
- list_del(&desc->node);
- d40c->free_len--;
+ d = kmem_cache_alloc(d40c->base->desc_slab, GFP_NOWAIT);
+ if (d != NULL) {
+ memset(d, 0, sizeof(struct d40_desc));
+ INIT_LIST_HEAD(&d->node);
+ }
}
-out:
- return desc;
+ return d;
}
static void d40_desc_free(struct d40_chan *d40c, struct d40_desc *d40d)
{
- if (d40c->free_len < D40_DESC_CACHE_SIZE) {
- list_add_tail(&d40d->node, &d40c->free);
- d40c->free_len++;
- } else
- kfree(d40d);
+ kmem_cache_free(d40c->base->desc_slab, d40d);
}
static void d40_desc_submit(struct d40_chan *d40c, struct d40_desc *desc)
@@ -456,37 +445,41 @@ static struct d40_desc *d40_first_queued(struct d40_chan *d40c)
/* Support functions for logical channels */
-static int d40_lcla_id_get(struct d40_chan *d40c,
- struct d40_lcla_pool *pool)
+static int d40_lcla_id_get(struct d40_chan *d40c)
{
int src_id = 0;
int dst_id = 0;
struct d40_log_lli *lcla_lidx_base =
- pool->base + d40c->phy_chan->num * 1024;
+ d40c->base->lcla_pool.base + d40c->phy_chan->num * 1024;
int i;
int lli_per_log = d40c->base->plat_data->llis_per_log;
+ unsigned long flags;
if (d40c->lcla.src_id >= 0 && d40c->lcla.dst_id >= 0)
return 0;
- if (pool->num_blocks > 32)
+ if (d40c->base->lcla_pool.num_blocks > 32)
return -EINVAL;
- spin_lock(&pool->lock);
+ spin_lock_irqsave(&d40c->base->lcla_pool.lock, flags);
- for (i = 0; i < pool->num_blocks; i++) {
- if (!(pool->alloc_map[d40c->phy_chan->num] & (0x1 << i))) {
- pool->alloc_map[d40c->phy_chan->num] |= (0x1 << i);
+ for (i = 0; i < d40c->base->lcla_pool.num_blocks; i++) {
+ if (!(d40c->base->lcla_pool.alloc_map[d40c->phy_chan->num] &
+ (0x1 << i))) {
+ d40c->base->lcla_pool.alloc_map[d40c->phy_chan->num] |=
+ (0x1 << i);
break;
}
}
src_id = i;
- if (src_id >= pool->num_blocks)
+ if (src_id >= d40c->base->lcla_pool.num_blocks)
goto err;
- for (; i < pool->num_blocks; i++) {
- if (!(pool->alloc_map[d40c->phy_chan->num] & (0x1 << i))) {
- pool->alloc_map[d40c->phy_chan->num] |= (0x1 << i);
+ for (; i < d40c->base->lcla_pool.num_blocks; i++) {
+ if (!(d40c->base->lcla_pool.alloc_map[d40c->phy_chan->num] &
+ (0x1 << i))) {
+ d40c->base->lcla_pool.alloc_map[d40c->phy_chan->num] |=
+ (0x1 << i);
break;
}
}
@@ -500,28 +493,13 @@ static int d40_lcla_id_get(struct d40_chan *d40c,
d40c->lcla.dst = lcla_lidx_base + dst_id * lli_per_log + 1;
d40c->lcla.src = lcla_lidx_base + src_id * lli_per_log + 1;
-
- spin_unlock(&pool->lock);
+ spin_unlock_irqrestore(&d40c->base->lcla_pool.lock, flags);
return 0;
err:
- spin_unlock(&pool->lock);
+ spin_unlock_irqrestore(&d40c->base->lcla_pool.lock, flags);
return -EINVAL;
}
-static void d40_lcla_id_put(struct d40_chan *d40c,
- struct d40_lcla_pool *pool,
- int id)
-{
- if (id < 0)
- return;
-
- d40c->lcla.src_id = -1;
- d40c->lcla.dst_id = -1;
-
- spin_lock(&pool->lock);
- pool->alloc_map[d40c->phy_chan->num] &= (~(0x1 << id));
- spin_unlock(&pool->lock);
-}
static int d40_channel_execute_command(struct d40_chan *d40c,
enum d40_command command)
@@ -530,6 +508,7 @@ static int d40_channel_execute_command(struct d40_chan *d40c,
void __iomem *active_reg;
int ret = 0;
unsigned long flags;
+ u32 wmask;
spin_lock_irqsave(&d40c->base->execmd_lock, flags);
@@ -547,7 +526,9 @@ static int d40_channel_execute_command(struct d40_chan *d40c,
goto done;
}
- writel(command << D40_CHAN_POS(d40c->phy_chan->num), active_reg);
+ wmask = 0xffffffff & ~(D40_CHAN_POS_MASK(d40c->phy_chan->num));
+ writel(wmask | (command << D40_CHAN_POS(d40c->phy_chan->num)),
+ active_reg);
if (command == D40_DMA_SUSPEND_REQ) {
@@ -586,8 +567,7 @@ done:
static void d40_term_all(struct d40_chan *d40c)
{
struct d40_desc *d40d;
- struct d40_desc *d;
- struct d40_desc *_d;
+ unsigned long flags;
/* Release active descriptors */
while ((d40d = d40_first_active_get(d40c))) {
@@ -605,19 +585,17 @@ static void d40_term_all(struct d40_chan *d40c)
d40_desc_free(d40c, d40d);
}
- /* Release client owned descriptors */
- if (!list_empty(&d40c->client))
- list_for_each_entry_safe(d, _d, &d40c->client, node) {
- d40_pool_lli_free(d);
- d40_desc_remove(d);
- /* Return desc to free-list */
- d40_desc_free(d40c, d40d);
- }
+ spin_lock_irqsave(&d40c->base->lcla_pool.lock, flags);
+
+ d40c->base->lcla_pool.alloc_map[d40c->phy_chan->num] &=
+ (~(0x1 << d40c->lcla.dst_id));
+ d40c->base->lcla_pool.alloc_map[d40c->phy_chan->num] &=
+ (~(0x1 << d40c->lcla.src_id));
+
+ d40c->lcla.src_id = -1;
+ d40c->lcla.dst_id = -1;
- d40_lcla_id_put(d40c, &d40c->base->lcla_pool,
- d40c->lcla.src_id);
- d40_lcla_id_put(d40c, &d40c->base->lcla_pool,
- d40c->lcla.dst_id);
+ spin_unlock_irqrestore(&d40c->base->lcla_pool.lock, flags);
d40c->pending_tx = 0;
d40c->busy = false;
@@ -628,6 +606,7 @@ static void d40_config_set_event(struct d40_chan *d40c, bool do_enable)
u32 val;
unsigned long flags;
+ /* Notice, that disable requires the physical channel to be stopped */
if (do_enable)
val = D40_ACTIVATE_EVENTLINE;
else
@@ -732,31 +711,34 @@ static int d40_config_write(struct d40_chan *d40c)
static void d40_desc_load(struct d40_chan *d40c, struct d40_desc *d40d)
{
-
if (d40d->lli_phy.dst && d40d->lli_phy.src) {
d40_phy_lli_write(d40c->base->virtbase,
d40c->phy_chan->num,
d40d->lli_phy.dst,
d40d->lli_phy.src);
- d40d->lli_tcount = d40d->lli_len;
} else if (d40d->lli_log.dst && d40d->lli_log.src) {
- u32 lli_len;
struct d40_log_lli *src = d40d->lli_log.src;
struct d40_log_lli *dst = d40d->lli_log.dst;
-
- src += d40d->lli_tcount;
- dst += d40d->lli_tcount;
-
- if (d40d->lli_len <= d40c->base->plat_data->llis_per_log)
- lli_len = d40d->lli_len;
- else
- lli_len = d40c->base->plat_data->llis_per_log;
- d40d->lli_tcount += lli_len;
- d40_log_lli_write(d40c->lcpa, d40c->lcla.src,
- d40c->lcla.dst,
- dst, src,
- d40c->base->plat_data->llis_per_log);
+ int s;
+
+ src += d40d->lli_count;
+ dst += d40d->lli_count;
+ s = d40_log_lli_write(d40c->lcpa,
+ d40c->lcla.src, d40c->lcla.dst,
+ dst, src,
+ d40c->base->plat_data->llis_per_log);
+
+ /* If s equals to zero, the job is not linked */
+ if (s > 0) {
+ (void) dma_map_single(d40c->base->dev, d40c->lcla.src,
+ s * sizeof(struct d40_log_lli),
+ DMA_TO_DEVICE);
+ (void) dma_map_single(d40c->base->dev, d40c->lcla.dst,
+ s * sizeof(struct d40_log_lli),
+ DMA_TO_DEVICE);
+ }
}
+ d40d->lli_count += d40d->lli_tx_len;
}
static dma_cookie_t d40_tx_submit(struct dma_async_tx_descriptor *tx)
@@ -780,18 +762,21 @@ static dma_cookie_t d40_tx_submit(struct dma_async_tx_descriptor *tx)
static int d40_start(struct d40_chan *d40c)
{
- int err;
+ if (d40c->base->rev == 0) {
+ int err;
- if (d40c->log_num != D40_PHY_CHAN) {
- err = d40_channel_execute_command(d40c, D40_DMA_SUSPEND_REQ);
- if (err)
- return err;
- d40_config_set_event(d40c, true);
+ if (d40c->log_num != D40_PHY_CHAN) {
+ err = d40_channel_execute_command(d40c,
+ D40_DMA_SUSPEND_REQ);
+ if (err)
+ return err;
+ }
}
- err = d40_channel_execute_command(d40c, D40_DMA_RUN);
+ if (d40c->log_num != D40_PHY_CHAN)
+ d40_config_set_event(d40c, true);
- return err;
+ return d40_channel_execute_command(d40c, D40_DMA_RUN);
}
static struct d40_desc *d40_queue_start(struct d40_chan *d40c)
@@ -838,7 +823,7 @@ static void dma_tc_handle(struct d40_chan *d40c)
if (d40d == NULL)
return;
- if (d40d->lli_tcount < d40d->lli_len) {
+ if (d40d->lli_count < d40d->lli_len) {
d40_desc_load(d40c, d40d);
/* Start dma job */
@@ -891,7 +876,6 @@ static void dma_tasklet(unsigned long data)
/* Return desc to free-list */
d40_desc_free(d40c, d40d_fin);
} else {
- d40_desc_reset(d40d_fin);
if (!d40d_fin->is_in_client_list) {
d40_desc_remove(d40d_fin);
list_add_tail(&d40d_fin->node, &d40c->client);
@@ -975,7 +959,8 @@ static irqreturn_t d40_handle_interrupt(int irq, void *data)
if (!il[row].is_error)
dma_tc_handle(d40c);
else
- dev_err(base->dev, "[%s] IRQ chan: %ld offset %d idx %d\n",
+ dev_err(base->dev,
+ "[%s] IRQ chan: %ld offset %d idx %d\n",
__func__, chan, il[row].offset, idx);
spin_unlock(&d40c->lock);
@@ -1134,7 +1119,8 @@ static int d40_allocate_channel(struct d40_chan *d40c)
int j;
int log_num;
bool is_src;
- bool is_log = (d40c->dma_cfg.channel_type & STEDMA40_CHANNEL_IN_OPER_MODE)
+ bool is_log = (d40c->dma_cfg.channel_type &
+ STEDMA40_CHANNEL_IN_OPER_MODE)
== STEDMA40_CHANNEL_IN_LOG_MODE;
@@ -1169,8 +1155,10 @@ static int d40_allocate_channel(struct d40_chan *d40c)
for (j = 0; j < d40c->base->num_phy_chans; j += 8) {
int phy_num = j + event_group * 2;
for (i = phy_num; i < phy_num + 2; i++) {
- if (d40_alloc_mask_set(&phys[i], is_src,
- 0, is_log))
+ if (d40_alloc_mask_set(&phys[i],
+ is_src,
+ 0,
+ is_log))
goto found_phy;
}
}
@@ -1221,30 +1209,6 @@ out:
}
-static int d40_config_chan(struct d40_chan *d40c,
- struct stedma40_chan_cfg *info)
-{
-
- /* Fill in basic CFG register values */
- d40_phy_cfg(&d40c->dma_cfg, &d40c->src_def_cfg,
- &d40c->dst_def_cfg, d40c->log_num != D40_PHY_CHAN);
-
- if (d40c->log_num != D40_PHY_CHAN) {
- d40_log_cfg(&d40c->dma_cfg,
- &d40c->log_def.lcsp1, &d40c->log_def.lcsp3);
-
- if (d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_MEM)
- d40c->lcpa = d40c->base->lcpa_base +
- d40c->dma_cfg.src_dev_type * 32;
- else
- d40c->lcpa = d40c->base->lcpa_base +
- d40c->dma_cfg.dst_dev_type * 32 + 16;
- }
-
- /* Write channel configuration to the DMA */
- return d40_config_write(d40c);
-}
-
static int d40_config_memcpy(struct d40_chan *d40c)
{
dma_cap_mask_t cap = d40c->chan.device->cap_mask;
@@ -1272,13 +1236,25 @@ static int d40_free_dma(struct d40_chan *d40c)
{
int res = 0;
- u32 event, dir;
+ u32 event;
struct d40_phy_res *phy = d40c->phy_chan;
bool is_src;
+ struct d40_desc *d;
+ struct d40_desc *_d;
+
/* Terminate all queued and active transfers */
d40_term_all(d40c);
+ /* Release client owned descriptors */
+ if (!list_empty(&d40c->client))
+ list_for_each_entry_safe(d, _d, &d40c->client, node) {
+ d40_pool_lli_free(d);
+ d40_desc_remove(d);
+ /* Return desc to free-list */
+ d40_desc_free(d40c, d);
+ }
+
if (phy == NULL) {
dev_err(&d40c->chan.dev->device, "[%s] phy == null\n",
__func__);
@@ -1292,22 +1268,12 @@ static int d40_free_dma(struct d40_chan *d40c)
return -EINVAL;
}
-
- res = d40_channel_execute_command(d40c, D40_DMA_SUSPEND_REQ);
- if (res) {
- dev_err(&d40c->chan.dev->device, "[%s] suspend\n",
- __func__);
- return res;
- }
-
if (d40c->dma_cfg.dir == STEDMA40_MEM_TO_PERIPH ||
d40c->dma_cfg.dir == STEDMA40_MEM_TO_MEM) {
event = D40_TYPE_TO_EVENT(d40c->dma_cfg.dst_dev_type);
- dir = D40_CHAN_REG_SDLNK;
is_src = false;
} else if (d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_MEM) {
event = D40_TYPE_TO_EVENT(d40c->dma_cfg.src_dev_type);
- dir = D40_CHAN_REG_SSLNK;
is_src = true;
} else {
dev_err(&d40c->chan.dev->device,
@@ -1315,16 +1281,17 @@ static int d40_free_dma(struct d40_chan *d40c)
return -EINVAL;
}
+ res = d40_channel_execute_command(d40c, D40_DMA_SUSPEND_REQ);
+ if (res) {
+ dev_err(&d40c->chan.dev->device, "[%s] suspend failed\n",
+ __func__);
+ return res;
+ }
+
if (d40c->log_num != D40_PHY_CHAN) {
- /*
- * Release logical channel, deactivate the event line during
- * the time physical res is suspended.
- */
- writel((D40_DEACTIVATE_EVENTLINE << D40_EVENTLINE_POS(event)) &
- D40_EVENTLINE_MASK(event),
- d40c->base->virtbase + D40_DREG_PCBASE +
- phy->num * D40_DREG_PCDELTA + dir);
+ /* Release logical channel, deactivate the event line */
+ d40_config_set_event(d40c, false);
d40c->base->lookup_log_chans[d40c->log_num] = NULL;
/*
@@ -1345,8 +1312,9 @@ static int d40_free_dma(struct d40_chan *d40c)
}
return 0;
}
- } else
- d40_alloc_mask_free(phy, is_src, 0);
+ } else {
+ (void) d40_alloc_mask_free(phy, is_src, 0);
+ }
/* Release physical channel */
res = d40_channel_execute_command(d40c, D40_DMA_STOP);
@@ -1361,8 +1329,6 @@ static int d40_free_dma(struct d40_chan *d40c)
d40c->base->lookup_phy_chans[phy->num] = NULL;
return 0;
-
-
}
static int d40_pause(struct dma_chan *chan)
@@ -1370,7 +1336,6 @@ static int d40_pause(struct dma_chan *chan)
struct d40_chan *d40c =
container_of(chan, struct d40_chan, chan);
int res;
-
unsigned long flags;
spin_lock_irqsave(&d40c->lock, flags);
@@ -1397,7 +1362,6 @@ static bool d40_is_paused(struct d40_chan *d40c)
void __iomem *active_reg;
u32 status;
u32 event;
- int res;
spin_lock_irqsave(&d40c->lock, flags);
@@ -1416,10 +1380,6 @@ static bool d40_is_paused(struct d40_chan *d40c)
goto _exit;
}
- res = d40_channel_execute_command(d40c, D40_DMA_SUSPEND_REQ);
- if (res != 0)
- goto _exit;
-
if (d40c->dma_cfg.dir == STEDMA40_MEM_TO_PERIPH ||
d40c->dma_cfg.dir == STEDMA40_MEM_TO_MEM)
event = D40_TYPE_TO_EVENT(d40c->dma_cfg.dst_dev_type);
@@ -1436,12 +1396,6 @@ static bool d40_is_paused(struct d40_chan *d40c)
if (status != D40_DMA_RUN)
is_paused = true;
-
- /* Resume the other logical channels if any */
- if (d40_chan_has_events(d40c))
- res = d40_channel_execute_command(d40c,
- D40_DMA_RUN);
-
_exit:
spin_unlock_irqrestore(&d40c->lock, flags);
return is_paused;
@@ -1468,13 +1422,14 @@ static u32 d40_residue(struct d40_chan *d40c)
u32 num_elt;
if (d40c->log_num != D40_PHY_CHAN)
- num_elt = (readl(&d40c->lcpa->lcsp2) & D40_MEM_LCSP2_ECNT_MASK)
+ num_elt = (readl(&d40c->lcpa->lcsp2) & D40_MEM_LCSP2_ECNT_MASK)
>> D40_MEM_LCSP2_ECNT_POS;
else
num_elt = (readl(d40c->base->virtbase + D40_DREG_PCBASE +
d40c->phy_chan->num * D40_DREG_PCDELTA +
D40_CHAN_REG_SDELT) &
- D40_SREG_ELEM_PHY_ECNT_MASK) >> D40_SREG_ELEM_PHY_ECNT_POS;
+ D40_SREG_ELEM_PHY_ECNT_MASK) >>
+ D40_SREG_ELEM_PHY_ECNT_POS;
return num_elt * (1 << d40c->dma_cfg.dst_info.data_width);
}
@@ -1487,20 +1442,21 @@ static int d40_resume(struct dma_chan *chan)
spin_lock_irqsave(&d40c->lock, flags);
- if (d40c->log_num != D40_PHY_CHAN) {
- res = d40_channel_execute_command(d40c, D40_DMA_SUSPEND_REQ);
- if (res)
- goto out;
+ if (d40c->base->rev == 0)
+ if (d40c->log_num != D40_PHY_CHAN) {
+ res = d40_channel_execute_command(d40c,
+ D40_DMA_SUSPEND_REQ);
+ goto no_suspend;
+ }
- /* If bytes left to transfer or linked tx resume job */
- if (d40_residue(d40c) || d40_tx_is_linked(d40c)) {
+ /* If bytes left to transfer or linked tx resume job */
+ if (d40_residue(d40c) || d40_tx_is_linked(d40c)) {
+ if (d40c->log_num != D40_PHY_CHAN)
d40_config_set_event(d40c, true);
- res = d40_channel_execute_command(d40c, D40_DMA_RUN);
- }
- } else if (d40_residue(d40c) || d40_tx_is_linked(d40c))
res = d40_channel_execute_command(d40c, D40_DMA_RUN);
+ }
-out:
+no_suspend:
spin_unlock_irqrestore(&d40c->lock, flags);
return res;
}
@@ -1534,8 +1490,10 @@ int stedma40_set_psize(struct dma_chan *chan,
if (d40c->log_num != D40_PHY_CHAN) {
d40c->log_def.lcsp1 &= ~D40_MEM_LCSP1_SCFG_PSIZE_MASK;
d40c->log_def.lcsp3 &= ~D40_MEM_LCSP1_SCFG_PSIZE_MASK;
- d40c->log_def.lcsp1 |= src_psize << D40_MEM_LCSP1_SCFG_PSIZE_POS;
- d40c->log_def.lcsp3 |= dst_psize << D40_MEM_LCSP1_SCFG_PSIZE_POS;
+ d40c->log_def.lcsp1 |= src_psize <<
+ D40_MEM_LCSP1_SCFG_PSIZE_POS;
+ d40c->log_def.lcsp3 |= dst_psize <<
+ D40_MEM_LCSP1_SCFG_PSIZE_POS;
goto out;
}
@@ -1566,37 +1524,42 @@ struct dma_async_tx_descriptor *stedma40_memcpy_sg(struct dma_chan *chan,
struct scatterlist *sgl_dst,
struct scatterlist *sgl_src,
unsigned int sgl_len,
- unsigned long flags)
+ unsigned long dma_flags)
{
int res;
struct d40_desc *d40d;
struct d40_chan *d40c = container_of(chan, struct d40_chan,
chan);
- unsigned long flg;
- int lli_max = d40c->base->plat_data->llis_per_log;
+ unsigned long flags;
+ if (d40c->phy_chan == NULL) {
+ dev_err(&d40c->chan.dev->device,
+ "[%s] Unallocated channel.\n", __func__);
+ return ERR_PTR(-EINVAL);
+ }
- spin_lock_irqsave(&d40c->lock, flg);
+ spin_lock_irqsave(&d40c->lock, flags);
d40d = d40_desc_get(d40c);
if (d40d == NULL)
goto err;
- memset(d40d, 0, sizeof(struct d40_desc));
d40d->lli_len = sgl_len;
-
- d40d->txd.flags = flags;
+ d40d->lli_tx_len = d40d->lli_len;
+ d40d->txd.flags = dma_flags;
if (d40c->log_num != D40_PHY_CHAN) {
+ if (d40d->lli_len > d40c->base->plat_data->llis_per_log)
+ d40d->lli_tx_len = d40c->base->plat_data->llis_per_log;
+
if (sgl_len > 1)
/*
* Check if there is space available in lcla. If not,
* split list into 1-length and run only in lcpa
* space.
*/
- if (d40_lcla_id_get(d40c,
- &d40c->base->lcla_pool) != 0)
- lli_max = 1;
+ if (d40_lcla_id_get(d40c) != 0)
+ d40d->lli_tx_len = 1;
if (d40_pool_lli_alloc(d40d, sgl_len, true) < 0) {
dev_err(&d40c->chan.dev->device,
@@ -1610,7 +1573,8 @@ struct dma_async_tx_descriptor *stedma40_memcpy_sg(struct dma_chan *chan,
d40d->lli_log.src,
d40c->log_def.lcsp1,
d40c->dma_cfg.src_info.data_width,
- flags & DMA_PREP_INTERRUPT, lli_max,
+ dma_flags & DMA_PREP_INTERRUPT,
+ d40d->lli_tx_len,
d40c->base->plat_data->llis_per_log);
(void) d40_log_sg_to_lli(d40c->lcla.dst_id,
@@ -1619,7 +1583,8 @@ struct dma_async_tx_descriptor *stedma40_memcpy_sg(struct dma_chan *chan,
d40d->lli_log.dst,
d40c->log_def.lcsp3,
d40c->dma_cfg.dst_info.data_width,
- flags & DMA_PREP_INTERRUPT, lli_max,
+ dma_flags & DMA_PREP_INTERRUPT,
+ d40d->lli_tx_len,
d40c->base->plat_data->llis_per_log);
@@ -1664,11 +1629,11 @@ struct dma_async_tx_descriptor *stedma40_memcpy_sg(struct dma_chan *chan,
d40d->txd.tx_submit = d40_tx_submit;
- spin_unlock_irqrestore(&d40c->lock, flg);
+ spin_unlock_irqrestore(&d40c->lock, flags);
return &d40d->txd;
err:
- spin_unlock_irqrestore(&d40c->lock, flg);
+ spin_unlock_irqrestore(&d40c->lock, flags);
return NULL;
}
EXPORT_SYMBOL(stedma40_memcpy_sg);
@@ -1698,46 +1663,66 @@ static int d40_alloc_chan_resources(struct dma_chan *chan)
unsigned long flags;
struct d40_chan *d40c =
container_of(chan, struct d40_chan, chan);
-
+ bool is_free_phy;
spin_lock_irqsave(&d40c->lock, flags);
d40c->completed = chan->cookie = 1;
/*
* If no dma configuration is set (channel_type == 0)
- * use default configuration
+ * use default configuration (memcpy)
*/
if (d40c->dma_cfg.channel_type == 0) {
err = d40_config_memcpy(d40c);
- if (err)
- goto err_alloc;
+ if (err) {
+ dev_err(&d40c->chan.dev->device,
+ "[%s] Failed to configure memcpy channel\n",
+ __func__);
+ goto fail;
+ }
}
+ is_free_phy = (d40c->phy_chan == NULL);
err = d40_allocate_channel(d40c);
if (err) {
dev_err(&d40c->chan.dev->device,
"[%s] Failed to allocate channel\n", __func__);
- goto err_alloc;
+ goto fail;
}
- err = d40_config_chan(d40c, &d40c->dma_cfg);
- if (err) {
- dev_err(&d40c->chan.dev->device,
- "[%s] Failed to configure channel\n",
- __func__);
- goto err_config;
- }
+ /* Fill in basic CFG register values */
+ d40_phy_cfg(&d40c->dma_cfg, &d40c->src_def_cfg,
+ &d40c->dst_def_cfg, d40c->log_num != D40_PHY_CHAN);
- spin_unlock_irqrestore(&d40c->lock, flags);
- return 0;
+ if (d40c->log_num != D40_PHY_CHAN) {
+ d40_log_cfg(&d40c->dma_cfg,
+ &d40c->log_def.lcsp1, &d40c->log_def.lcsp3);
- err_config:
- (void) d40_free_dma(d40c);
- err_alloc:
+ if (d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_MEM)
+ d40c->lcpa = d40c->base->lcpa_base +
+ d40c->dma_cfg.src_dev_type * D40_LCPA_CHAN_SIZE;
+ else
+ d40c->lcpa = d40c->base->lcpa_base +
+ d40c->dma_cfg.dst_dev_type *
+ D40_LCPA_CHAN_SIZE + D40_LCPA_CHAN_DST_DELTA;
+ }
+
+ /*
+ * Only write channel configuration to the DMA if the physical
+ * resource is free. In case of multiple logical channels
+ * on the same physical resource, only the first write is necessary.
+ */
+ if (is_free_phy) {
+ err = d40_config_write(d40c);
+ if (err) {
+ dev_err(&d40c->chan.dev->device,
+ "[%s] Failed to configure channel\n",
+ __func__);
+ }
+ }
+fail:
spin_unlock_irqrestore(&d40c->lock, flags);
- dev_err(&d40c->chan.dev->device,
- "[%s] Channel allocation failed\n", __func__);
- return -EINVAL;
+ return err;
}
static void d40_free_chan_resources(struct dma_chan *chan)
@@ -1747,6 +1732,13 @@ static void d40_free_chan_resources(struct dma_chan *chan)
int err;
unsigned long flags;
+ if (d40c->phy_chan == NULL) {
+ dev_err(&d40c->chan.dev->device,
+ "[%s] Cannot free unallocated channel\n", __func__);
+ return;
+ }
+
+
spin_lock_irqsave(&d40c->lock, flags);
err = d40_free_dma(d40c);
@@ -1761,15 +1753,21 @@ static struct dma_async_tx_descriptor *d40_prep_memcpy(struct dma_chan *chan,
dma_addr_t dst,
dma_addr_t src,
size_t size,
- unsigned long flags)
+ unsigned long dma_flags)
{
struct d40_desc *d40d;
struct d40_chan *d40c = container_of(chan, struct d40_chan,
chan);
- unsigned long flg;
+ unsigned long flags;
int err = 0;
- spin_lock_irqsave(&d40c->lock, flg);
+ if (d40c->phy_chan == NULL) {
+ dev_err(&d40c->chan.dev->device,
+ "[%s] Channel is not allocated.\n", __func__);
+ return ERR_PTR(-EINVAL);
+ }
+
+ spin_lock_irqsave(&d40c->lock, flags);
d40d = d40_desc_get(d40c);
if (d40d == NULL) {
@@ -1778,9 +1776,7 @@ static struct dma_async_tx_descriptor *d40_prep_memcpy(struct dma_chan *chan,
goto err;
}
- memset(d40d, 0, sizeof(struct d40_desc));
-
- d40d->txd.flags = flags;
+ d40d->txd.flags = dma_flags;
dma_async_tx_descriptor_init(&d40d->txd, chan);
@@ -1794,6 +1790,7 @@ static struct dma_async_tx_descriptor *d40_prep_memcpy(struct dma_chan *chan,
goto err;
}
d40d->lli_len = 1;
+ d40d->lli_tx_len = 1;
d40_log_fill_lli(d40d->lli_log.src,
src,
@@ -1801,7 +1798,7 @@ static struct dma_async_tx_descriptor *d40_prep_memcpy(struct dma_chan *chan,
0,
d40c->log_def.lcsp1,
d40c->dma_cfg.src_info.data_width,
- true, true);
+ false, true);
d40_log_fill_lli(d40d->lli_log.dst,
dst,
@@ -1848,7 +1845,7 @@ static struct dma_async_tx_descriptor *d40_prep_memcpy(struct dma_chan *chan,
d40d->lli_pool.size, DMA_TO_DEVICE);
}
- spin_unlock_irqrestore(&d40c->lock, flg);
+ spin_unlock_irqrestore(&d40c->lock, flags);
return &d40d->txd;
err_fill_lli:
@@ -1856,7 +1853,7 @@ err_fill_lli:
"[%s] Failed filling in PHY LLI\n", __func__);
d40_pool_lli_free(d40d);
err:
- spin_unlock_irqrestore(&d40c->lock, flg);
+ spin_unlock_irqrestore(&d40c->lock, flags);
return NULL;
}
@@ -1865,11 +1862,10 @@ static int d40_prep_slave_sg_log(struct d40_desc *d40d,
struct scatterlist *sgl,
unsigned int sg_len,
enum dma_data_direction direction,
- unsigned long flags)
+ unsigned long dma_flags)
{
dma_addr_t dev_addr = 0;
int total_size;
- int lli_max = d40c->base->plat_data->llis_per_log;
if (d40_pool_lli_alloc(d40d, sg_len, true) < 0) {
dev_err(&d40c->chan.dev->device,
@@ -1878,7 +1874,10 @@ static int d40_prep_slave_sg_log(struct d40_desc *d40d,
}
d40d->lli_len = sg_len;
- d40d->lli_tcount = 0;
+ if (d40d->lli_len <= d40c->base->plat_data->llis_per_log)
+ d40d->lli_tx_len = d40d->lli_len;
+ else
+ d40d->lli_tx_len = d40c->base->plat_data->llis_per_log;
if (sg_len > 1)
/*
@@ -1886,35 +1885,34 @@ static int d40_prep_slave_sg_log(struct d40_desc *d40d,
* If not, split list into 1-length and run only
* in lcpa space.
*/
- if (d40_lcla_id_get(d40c, &d40c->base->lcla_pool) != 0)
- lli_max = 1;
+ if (d40_lcla_id_get(d40c) != 0)
+ d40d->lli_tx_len = 1;
- if (direction == DMA_FROM_DEVICE) {
- dev_addr = d40c->base->plat_data->dev_rx[d40c->dma_cfg.src_dev_type];
- total_size = d40_log_sg_to_dev(&d40c->lcla,
- sgl, sg_len,
- &d40d->lli_log,
- &d40c->log_def,
- d40c->dma_cfg.src_info.data_width,
- d40c->dma_cfg.dst_info.data_width,
- direction,
- flags & DMA_PREP_INTERRUPT,
- dev_addr, lli_max,
- d40c->base->plat_data->llis_per_log);
- } else if (direction == DMA_TO_DEVICE) {
- dev_addr = d40c->base->plat_data->dev_tx[d40c->dma_cfg.dst_dev_type];
- total_size = d40_log_sg_to_dev(&d40c->lcla,
- sgl, sg_len,
- &d40d->lli_log,
- &d40c->log_def,
- d40c->dma_cfg.src_info.data_width,
- d40c->dma_cfg.dst_info.data_width,
- direction,
- flags & DMA_PREP_INTERRUPT,
- dev_addr, lli_max,
- d40c->base->plat_data->llis_per_log);
- } else
+ if (direction == DMA_FROM_DEVICE)
+ if (d40c->runtime_addr)
+ dev_addr = d40c->runtime_addr;
+ else
+ dev_addr = d40c->base->plat_data->dev_rx[d40c->dma_cfg.src_dev_type];
+ else if (direction == DMA_TO_DEVICE)
+ if (d40c->runtime_addr)
+ dev_addr = d40c->runtime_addr;
+ else
+ dev_addr = d40c->base->plat_data->dev_tx[d40c->dma_cfg.dst_dev_type];
+
+ else
return -EINVAL;
+
+ total_size = d40_log_sg_to_dev(&d40c->lcla,
+ sgl, sg_len,
+ &d40d->lli_log,
+ &d40c->log_def,
+ d40c->dma_cfg.src_info.data_width,
+ d40c->dma_cfg.dst_info.data_width,
+ direction,
+ dma_flags & DMA_PREP_INTERRUPT,
+ dev_addr, d40d->lli_tx_len,
+ d40c->base->plat_data->llis_per_log);
+
if (total_size < 0)
return -EINVAL;
@@ -1926,7 +1924,7 @@ static int d40_prep_slave_sg_phy(struct d40_desc *d40d,
struct scatterlist *sgl,
unsigned int sgl_len,
enum dma_data_direction direction,
- unsigned long flags)
+ unsigned long dma_flags)
{
dma_addr_t src_dev_addr;
dma_addr_t dst_dev_addr;
@@ -1939,13 +1937,19 @@ static int d40_prep_slave_sg_phy(struct d40_desc *d40d,
}
d40d->lli_len = sgl_len;
- d40d->lli_tcount = 0;
+ d40d->lli_tx_len = sgl_len;
if (direction == DMA_FROM_DEVICE) {
dst_dev_addr = 0;
- src_dev_addr = d40c->base->plat_data->dev_rx[d40c->dma_cfg.src_dev_type];
+ if (d40c->runtime_addr)
+ src_dev_addr = d40c->runtime_addr;
+ else
+ src_dev_addr = d40c->base->plat_data->dev_rx[d40c->dma_cfg.src_dev_type];
} else if (direction == DMA_TO_DEVICE) {
- dst_dev_addr = d40c->base->plat_data->dev_tx[d40c->dma_cfg.dst_dev_type];
+ if (d40c->runtime_addr)
+ dst_dev_addr = d40c->runtime_addr;
+ else
+ dst_dev_addr = d40c->base->plat_data->dev_tx[d40c->dma_cfg.dst_dev_type];
src_dev_addr = 0;
} else
return -EINVAL;
@@ -1983,34 +1987,38 @@ static struct dma_async_tx_descriptor *d40_prep_slave_sg(struct dma_chan *chan,
struct scatterlist *sgl,
unsigned int sg_len,
enum dma_data_direction direction,
- unsigned long flags)
+ unsigned long dma_flags)
{
struct d40_desc *d40d;
struct d40_chan *d40c = container_of(chan, struct d40_chan,
chan);
- unsigned long flg;
+ unsigned long flags;
int err;
+ if (d40c->phy_chan == NULL) {
+ dev_err(&d40c->chan.dev->device,
+ "[%s] Cannot prepare unallocated channel\n", __func__);
+ return ERR_PTR(-EINVAL);
+ }
+
if (d40c->dma_cfg.pre_transfer)
d40c->dma_cfg.pre_transfer(chan,
d40c->dma_cfg.pre_transfer_data,
sg_dma_len(sgl));
- spin_lock_irqsave(&d40c->lock, flg);
+ spin_lock_irqsave(&d40c->lock, flags);
d40d = d40_desc_get(d40c);
- spin_unlock_irqrestore(&d40c->lock, flg);
+ spin_unlock_irqrestore(&d40c->lock, flags);
if (d40d == NULL)
return NULL;
- memset(d40d, 0, sizeof(struct d40_desc));
-
if (d40c->log_num != D40_PHY_CHAN)
err = d40_prep_slave_sg_log(d40d, d40c, sgl, sg_len,
- direction, flags);
+ direction, dma_flags);
else
err = d40_prep_slave_sg_phy(d40d, d40c, sgl, sg_len,
- direction, flags);
+ direction, dma_flags);
if (err) {
dev_err(&d40c->chan.dev->device,
"[%s] Failed to prepare %s slave sg job: %d\n",
@@ -2019,7 +2027,7 @@ static struct dma_async_tx_descriptor *d40_prep_slave_sg(struct dma_chan *chan,
return NULL;
}
- d40d->txd.flags = flags;
+ d40d->txd.flags = dma_flags;
dma_async_tx_descriptor_init(&d40d->txd, chan);
@@ -2037,6 +2045,13 @@ static enum dma_status d40_tx_status(struct dma_chan *chan,
dma_cookie_t last_complete;
int ret;
+ if (d40c->phy_chan == NULL) {
+ dev_err(&d40c->chan.dev->device,
+ "[%s] Cannot read status of unallocated channel\n",
+ __func__);
+ return -EINVAL;
+ }
+
last_complete = d40c->completed;
last_used = chan->cookie;
@@ -2056,6 +2071,12 @@ static void d40_issue_pending(struct dma_chan *chan)
struct d40_chan *d40c = container_of(chan, struct d40_chan, chan);
unsigned long flags;
+ if (d40c->phy_chan == NULL) {
+ dev_err(&d40c->chan.dev->device,
+ "[%s] Channel is not allocated!\n", __func__);
+ return;
+ }
+
spin_lock_irqsave(&d40c->lock, flags);
/* Busy means that pending jobs are already being processed */
@@ -2065,12 +2086,129 @@ static void d40_issue_pending(struct dma_chan *chan)
spin_unlock_irqrestore(&d40c->lock, flags);
}
+/* Runtime reconfiguration extension */
+static void d40_set_runtime_config(struct dma_chan *chan,
+ struct dma_slave_config *config)
+{
+ struct d40_chan *d40c = container_of(chan, struct d40_chan, chan);
+ struct stedma40_chan_cfg *cfg = &d40c->dma_cfg;
+ enum dma_slave_buswidth config_addr_width;
+ dma_addr_t config_addr;
+ u32 config_maxburst;
+ enum stedma40_periph_data_width addr_width;
+ int psize;
+
+ if (config->direction == DMA_FROM_DEVICE) {
+ dma_addr_t dev_addr_rx =
+ d40c->base->plat_data->dev_rx[cfg->src_dev_type];
+
+ config_addr = config->src_addr;
+ if (dev_addr_rx)
+ dev_dbg(d40c->base->dev,
+ "channel has a pre-wired RX address %08x "
+ "overriding with %08x\n",
+ dev_addr_rx, config_addr);
+ if (cfg->dir != STEDMA40_PERIPH_TO_MEM)
+ dev_dbg(d40c->base->dev,
+ "channel was not configured for peripheral "
+ "to memory transfer (%d) overriding\n",
+ cfg->dir);
+ cfg->dir = STEDMA40_PERIPH_TO_MEM;
+
+ config_addr_width = config->src_addr_width;
+ config_maxburst = config->src_maxburst;
+
+ } else if (config->direction == DMA_TO_DEVICE) {
+ dma_addr_t dev_addr_tx =
+ d40c->base->plat_data->dev_tx[cfg->dst_dev_type];
+
+ config_addr = config->dst_addr;
+ if (dev_addr_tx)
+ dev_dbg(d40c->base->dev,
+ "channel has a pre-wired TX address %08x "
+ "overriding with %08x\n",
+ dev_addr_tx, config_addr);
+ if (cfg->dir != STEDMA40_MEM_TO_PERIPH)
+ dev_dbg(d40c->base->dev,
+ "channel was not configured for memory "
+ "to peripheral transfer (%d) overriding\n",
+ cfg->dir);
+ cfg->dir = STEDMA40_MEM_TO_PERIPH;
+
+ config_addr_width = config->dst_addr_width;
+ config_maxburst = config->dst_maxburst;
+
+ } else {
+ dev_err(d40c->base->dev,
+ "unrecognized channel direction %d\n",
+ config->direction);
+ return;
+ }
+
+ switch (config_addr_width) {
+ case DMA_SLAVE_BUSWIDTH_1_BYTE:
+ addr_width = STEDMA40_BYTE_WIDTH;
+ break;
+ case DMA_SLAVE_BUSWIDTH_2_BYTES:
+ addr_width = STEDMA40_HALFWORD_WIDTH;
+ break;
+ case DMA_SLAVE_BUSWIDTH_4_BYTES:
+ addr_width = STEDMA40_WORD_WIDTH;
+ break;
+ case DMA_SLAVE_BUSWIDTH_8_BYTES:
+ addr_width = STEDMA40_DOUBLEWORD_WIDTH;
+ break;
+ default:
+ dev_err(d40c->base->dev,
+ "illegal peripheral address width "
+ "requested (%d)\n",
+ config->src_addr_width);
+ return;
+ }
+
+ if (config_maxburst >= 16)
+ psize = STEDMA40_PSIZE_LOG_16;
+ else if (config_maxburst >= 8)
+ psize = STEDMA40_PSIZE_LOG_8;
+ else if (config_maxburst >= 4)
+ psize = STEDMA40_PSIZE_LOG_4;
+ else
+ psize = STEDMA40_PSIZE_LOG_1;
+
+ /* Set up all the endpoint configs */
+ cfg->src_info.data_width = addr_width;
+ cfg->src_info.psize = psize;
+ cfg->src_info.endianess = STEDMA40_LITTLE_ENDIAN;
+ cfg->src_info.flow_ctrl = STEDMA40_NO_FLOW_CTRL;
+ cfg->dst_info.data_width = addr_width;
+ cfg->dst_info.psize = psize;
+ cfg->dst_info.endianess = STEDMA40_LITTLE_ENDIAN;
+ cfg->dst_info.flow_ctrl = STEDMA40_NO_FLOW_CTRL;
+
+ /* These settings will take precedence later */
+ d40c->runtime_addr = config_addr;
+ d40c->runtime_direction = config->direction;
+ dev_dbg(d40c->base->dev,
+ "configured channel %s for %s, data width %d, "
+ "maxburst %d bytes, LE, no flow control\n",
+ dma_chan_name(chan),
+ (config->direction == DMA_FROM_DEVICE) ? "RX" : "TX",
+ config_addr_width,
+ config_maxburst);
+}
+
static int d40_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
unsigned long arg)
{
unsigned long flags;
struct d40_chan *d40c = container_of(chan, struct d40_chan, chan);
+ if (d40c->phy_chan == NULL) {
+ dev_err(&d40c->chan.dev->device,
+ "[%s] Channel is not allocated!\n", __func__);
+ return -EINVAL;
+ }
+
switch (cmd) {
case DMA_TERMINATE_ALL:
spin_lock_irqsave(&d40c->lock, flags);
@@ -2081,6 +2219,12 @@ static int d40_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
return d40_pause(chan);
case DMA_RESUME:
return d40_resume(chan);
+ case DMA_SLAVE_CONFIG:
+ d40_set_runtime_config(chan,
+ (struct dma_slave_config *) arg);
+ return 0;
+ default:
+ break;
}
/* Other commands are unimplemented */
@@ -2111,13 +2255,10 @@ static void __init d40_chan_init(struct d40_base *base, struct dma_device *dma,
d40c->log_num = D40_PHY_CHAN;
- INIT_LIST_HEAD(&d40c->free);
INIT_LIST_HEAD(&d40c->active);
INIT_LIST_HEAD(&d40c->queue);
INIT_LIST_HEAD(&d40c->client);
- d40c->free_len = 0;
-
tasklet_init(&d40c->tasklet, dma_tasklet,
(unsigned long) d40c);
@@ -2243,6 +2384,14 @@ static int __init d40_phy_res_init(struct d40_base *base)
}
spin_lock_init(&base->phy_res[i].lock);
}
+
+ /* Mark disabled channels as occupied */
+ for (i = 0; base->plat_data->disabled_channels[i] != -1; i++) {
+ base->phy_res[i].allocated_src = D40_ALLOC_PHY;
+ base->phy_res[i].allocated_dst = D40_ALLOC_PHY;
+ num_phy_chans_avail--;
+ }
+
dev_info(base->dev, "%d of %d physical DMA channels available\n",
num_phy_chans_avail, base->num_phy_chans);
@@ -2291,6 +2440,7 @@ static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev)
int num_log_chans = 0;
int num_phy_chans;
int i;
+ u32 val;
clk = clk_get(&pdev->dev, NULL);
@@ -2329,12 +2479,13 @@ static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev)
}
}
- i = readl(virtbase + D40_DREG_PERIPHID2);
+ /* Get silicon revision */
+ val = readl(virtbase + D40_DREG_PERIPHID2);
- if ((i & 0xf) != D40_PERIPHID2_DESIGNER) {
+ if ((val & 0xf) != D40_PERIPHID2_DESIGNER) {
dev_err(&pdev->dev,
"[%s] Unknown designer! Got %x wanted %x\n",
- __func__, i & 0xf, D40_PERIPHID2_DESIGNER);
+ __func__, val & 0xf, D40_PERIPHID2_DESIGNER);
goto failure;
}
@@ -2342,7 +2493,7 @@ static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev)
num_phy_chans = 4 * (readl(virtbase + D40_DREG_ICFG) & 0x7) + 4;
dev_info(&pdev->dev, "hardware revision: %d @ 0x%x\n",
- (i >> 4) & 0xf, res->start);
+ (val >> 4) & 0xf, res->start);
plat_data = pdev->dev.platform_data;
@@ -2364,6 +2515,7 @@ static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev)
goto failure;
}
+ base->rev = (val >> 4) & 0xf;
base->clk = clk;
base->num_phy_chans = num_phy_chans;
base->num_log_chans = num_log_chans;
@@ -2402,6 +2554,12 @@ static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev)
if (!base->lcla_pool.alloc_map)
goto failure;
+ base->desc_slab = kmem_cache_create(D40_NAME, sizeof(struct d40_desc),
+ 0, SLAB_HWCACHE_ALIGN,
+ NULL);
+ if (base->desc_slab == NULL)
+ goto failure;
+
return base;
failure:
@@ -2495,6 +2653,78 @@ static void __init d40_hw_init(struct d40_base *base)
}
+static int __init d40_lcla_allocate(struct d40_base *base)
+{
+ unsigned long *page_list;
+ int i, j;
+ int ret = 0;
+
+ /*
+ * This is somewhat ugly. We need 8192 bytes that are 18 bit aligned,
+ * To full fill this hardware requirement without wasting 256 kb
+ * we allocate pages until we get an aligned one.
+ */
+ page_list = kmalloc(sizeof(unsigned long) * MAX_LCLA_ALLOC_ATTEMPTS,
+ GFP_KERNEL);
+
+ if (!page_list) {
+ ret = -ENOMEM;
+ goto failure;
+ }
+
+ /* Calculating how many pages that are required */
+ base->lcla_pool.pages = SZ_1K * base->num_phy_chans / PAGE_SIZE;
+
+ for (i = 0; i < MAX_LCLA_ALLOC_ATTEMPTS; i++) {
+ page_list[i] = __get_free_pages(GFP_KERNEL,
+ base->lcla_pool.pages);
+ if (!page_list[i]) {
+
+ dev_err(base->dev,
+ "[%s] Failed to allocate %d pages.\n",
+ __func__, base->lcla_pool.pages);
+
+ for (j = 0; j < i; j++)
+ free_pages(page_list[j], base->lcla_pool.pages);
+ goto failure;
+ }
+
+ if ((virt_to_phys((void *)page_list[i]) &
+ (LCLA_ALIGNMENT - 1)) == 0)
+ break;
+ }
+
+ for (j = 0; j < i; j++)
+ free_pages(page_list[j], base->lcla_pool.pages);
+
+ if (i < MAX_LCLA_ALLOC_ATTEMPTS) {
+ base->lcla_pool.base = (void *)page_list[i];
+ } else {
+ /* After many attempts, no succees with finding the correct
+ * alignment try with allocating a big buffer */
+ dev_warn(base->dev,
+ "[%s] Failed to get %d pages @ 18 bit align.\n",
+ __func__, base->lcla_pool.pages);
+ base->lcla_pool.base_unaligned = kmalloc(SZ_1K *
+ base->num_phy_chans +
+ LCLA_ALIGNMENT,
+ GFP_KERNEL);
+ if (!base->lcla_pool.base_unaligned) {
+ ret = -ENOMEM;
+ goto failure;
+ }
+
+ base->lcla_pool.base = PTR_ALIGN(base->lcla_pool.base_unaligned,
+ LCLA_ALIGNMENT);
+ }
+
+ writel(virt_to_phys(base->lcla_pool.base),
+ base->virtbase + D40_DREG_LCLA);
+failure:
+ kfree(page_list);
+ return ret;
+}
+
static int __init d40_probe(struct platform_device *pdev)
{
int err;
@@ -2554,41 +2784,11 @@ static int __init d40_probe(struct platform_device *pdev)
__func__);
goto failure;
}
- /* Get IO for logical channel link address */
- res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "lcla");
- if (!res) {
- ret = -ENOENT;
- dev_err(&pdev->dev,
- "[%s] No \"lcla\" resource defined\n",
- __func__);
- goto failure;
- }
- base->lcla_pool.base_size = resource_size(res);
- base->lcla_pool.phy = res->start;
-
- if (request_mem_region(res->start, resource_size(res),
- D40_NAME " I/O lcla") == NULL) {
- ret = -EBUSY;
- dev_err(&pdev->dev,
- "[%s] Failed to request LCLA region 0x%x-0x%x\n",
- __func__, res->start, res->end);
- goto failure;
- }
- val = readl(base->virtbase + D40_DREG_LCLA);
- if (res->start != val && val != 0) {
- dev_warn(&pdev->dev,
- "[%s] Mismatch LCLA dma 0x%x, def 0x%x\n",
- __func__, val, res->start);
- } else
- writel(res->start, base->virtbase + D40_DREG_LCLA);
-
- base->lcla_pool.base = ioremap(res->start, resource_size(res));
- if (!base->lcla_pool.base) {
- ret = -ENOMEM;
- dev_err(&pdev->dev,
- "[%s] Failed to ioremap LCLA 0x%x-0x%x\n",
- __func__, res->start, res->end);
+ ret = d40_lcla_allocate(base);
+ if (ret) {
+ dev_err(&pdev->dev, "[%s] Failed to allocate LCLA area\n",
+ __func__);
goto failure;
}
@@ -2616,11 +2816,15 @@ static int __init d40_probe(struct platform_device *pdev)
failure:
if (base) {
+ if (base->desc_slab)
+ kmem_cache_destroy(base->desc_slab);
if (base->virtbase)
iounmap(base->virtbase);
- if (base->lcla_pool.phy)
- release_mem_region(base->lcla_pool.phy,
- base->lcla_pool.base_size);
+ if (!base->lcla_pool.base_unaligned && base->lcla_pool.base)
+ free_pages((unsigned long)base->lcla_pool.base,
+ base->lcla_pool.pages);
+ if (base->lcla_pool.base_unaligned)
+ kfree(base->lcla_pool.base_unaligned);
if (base->phy_lcpa)
release_mem_region(base->phy_lcpa,
base->lcpa_size);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.