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Message-ID: <1275394921-26633-1-git-send-email-linus.walleij@stericsson.com>
Date: Tue, 1 Jun 2010 14:22:01 +0200
From: Linus Walleij <linus.walleij@...ricsson.com>
To: Dan Williams <dan.j.williams@...el.com>
Cc: <linux-kernel@...r.kernel.org>,
Linus Walleij <linus.walleij@...ricsson.com>,
Jonas Aaberg <jonas.aberg@...ricsson.com>
Subject: [PATCH 12/18] DMAENGINE: ste_dma40: allocate LCLA dynamically
Switch to allocating LCLA in memory instead of having a fixed
address.
Signed-off-by: Jonas Aaberg <jonas.aberg@...ricsson.com>
Signed-off-by: Linus Walleij <linus.walleij@...ricsson.com>
---
drivers/dma/ste_dma40.c | 246 +++++++++++++++++++++++++++-----------------
drivers/dma/ste_dma40_ll.c | 5 +-
drivers/dma/ste_dma40_ll.h | 12 +-
3 files changed, 161 insertions(+), 102 deletions(-)
diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
index 5579401..ec092fa 100644
--- a/drivers/dma/ste_dma40.c
+++ b/drivers/dma/ste_dma40.c
@@ -30,6 +30,12 @@
/* 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
@@ -64,9 +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)];
};
/**
@@ -111,18 +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;
@@ -432,13 +440,12 @@ 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;
@@ -446,24 +453,28 @@ static int d40_lcla_id_get(struct d40_chan *d40c,
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_irqsave(&pool->lock, flags);
+ 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;
}
}
@@ -477,29 +488,13 @@ 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_irqrestore(&pool->lock, flags);
+ spin_unlock_irqrestore(&d40c->base->lcla_pool.lock, flags);
return 0;
err:
- spin_unlock_irqrestore(&pool->lock, flags);
+ 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)
-{
- unsigned long flags;
- if (id < 0)
- return;
-
- d40c->lcla.src_id = -1;
- d40c->lcla.dst_id = -1;
-
- spin_lock_irqsave(&pool->lock, flags);
- pool->alloc_map[d40c->phy_chan->num] &= (~(0x1 << id));
- spin_unlock_irqrestore(&pool->lock, flags);
-}
static int d40_channel_execute_command(struct d40_chan *d40c,
enum d40_command command)
@@ -567,6 +562,7 @@ done:
static void d40_term_all(struct d40_chan *d40c)
{
struct d40_desc *d40d;
+ unsigned long flags;
/* Release active descriptors */
while ((d40d = d40_first_active_get(d40c))) {
@@ -584,10 +580,17 @@ static void d40_term_all(struct d40_chan *d40c)
d40_desc_free(d40c, d40d);
}
- 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_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;
+
+ spin_unlock_irqrestore(&d40c->base->lcla_pool.lock, flags);
d40c->pending_tx = 0;
d40c->busy = false;
@@ -703,7 +706,6 @@ 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,
@@ -712,13 +714,24 @@ static void d40_desc_load(struct d40_chan *d40c, struct d40_desc *d40d)
} else if (d40d->lli_log.dst && d40d->lli_log.src) {
struct d40_log_lli *src = d40d->lli_log.src;
struct d40_log_lli *dst = d40d->lli_log.dst;
+ int s;
src += d40d->lli_count;
dst += d40d->lli_count;
- d40_log_lli_write(d40c->lcpa, d40c->lcla.src,
- d40c->lcla.dst,
- dst, src,
- d40c->base->plat_data->llis_per_log);
+ 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;
}
@@ -930,7 +943,8 @@ 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);
@@ -1089,7 +1103,8 @@ 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;
@@ -1124,8 +1139,10 @@ 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;
}
}
@@ -1426,13 +1443,14 @@ 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);
}
@@ -1485,8 +1503,10 @@ 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;
}
@@ -1551,8 +1571,7 @@ struct dma_async_tx_descriptor *stedma40_memcpy_sg(struct dma_chan *chan,
* split list into 1-length and run only in lcpa
* space.
*/
- if (d40_lcla_id_get(d40c,
- &d40c->base->lcla_pool) != 0)
+ if (d40_lcla_id_get(d40c) != 0)
d40d->lli_tx_len = 1;
if (d40_pool_lli_alloc(d40d, sgl_len, true) < 0) {
@@ -1855,7 +1874,7 @@ 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)
+ if (d40_lcla_id_get(d40c) != 0)
d40d->lli_tx_len = 1;
if (direction == DMA_FROM_DEVICE)
@@ -2482,6 +2501,71 @@ 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 /
+ SZ_1K - 1) / PAGE_SIZE + 3;
+
+ for (i = 0; i < MAX_LCLA_ALLOC_ATTEMPTS; i++) {
+ page_list[i] = __get_free_pages(GFP_KERNEL,
+ base->lcla_pool.pages);
+
+ if ((virt_to_phys((void *)page_list[i]) &
+ (LCLA_ALIGNMENT - 1)) == 0 && page_list[i] != 0)
+ break;
+ }
+
+ for (j = 0; j < i; j++) {
+ if (page_list[i] != 0)
+ 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;
@@ -2541,41 +2625,11 @@ 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;
}
@@ -2607,9 +2661,11 @@ failure:
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);
diff --git a/drivers/dma/ste_dma40_ll.c b/drivers/dma/ste_dma40_ll.c
index 772636b..d937f76 100644
--- a/drivers/dma/ste_dma40_ll.c
+++ b/drivers/dma/ste_dma40_ll.c
@@ -420,7 +420,7 @@ int d40_log_sg_to_lli(int lcla_id,
return total_size;
}
-void d40_log_lli_write(struct d40_log_lli_full *lcpa,
+int d40_log_lli_write(struct d40_log_lli_full *lcpa,
struct d40_log_lli *lcla_src,
struct d40_log_lli *lcla_dst,
struct d40_log_lli *lli_dst,
@@ -448,4 +448,7 @@ void d40_log_lli_write(struct d40_log_lli_full *lcpa,
slos = lli_src[i + 1].lcsp13 & D40_MEM_LCSP1_SLOS_MASK;
dlos = lli_dst[i + 1].lcsp13 & D40_MEM_LCSP3_DLOS_MASK;
}
+
+ return i;
+
}
diff --git a/drivers/dma/ste_dma40_ll.h b/drivers/dma/ste_dma40_ll.h
index 2029280..d745e40 100644
--- a/drivers/dma/ste_dma40_ll.h
+++ b/drivers/dma/ste_dma40_ll.h
@@ -336,12 +336,12 @@ int d40_log_sg_to_dev(struct d40_lcla_elem *lcla,
bool term_int, dma_addr_t dev_addr, int max_len,
int llis_per_log);
-void d40_log_lli_write(struct d40_log_lli_full *lcpa,
- struct d40_log_lli *lcla_src,
- struct d40_log_lli *lcla_dst,
- struct d40_log_lli *lli_dst,
- struct d40_log_lli *lli_src,
- int llis_per_log);
+int d40_log_lli_write(struct d40_log_lli_full *lcpa,
+ struct d40_log_lli *lcla_src,
+ struct d40_log_lli *lcla_dst,
+ struct d40_log_lli *lli_dst,
+ struct d40_log_lli *lli_src,
+ int llis_per_log);
int d40_log_sg_to_lli(int lcla_id,
struct scatterlist *sg,
--
1.6.3.3
--
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