aboutsummaryrefslogtreecommitdiff
path: root/drivers/dma/dw_dmac.c
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2013-02-26 09:24:48 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2013-02-26 09:24:48 -0800
commit5115f3c19d17851aaff5a857f55b4a019c908775 (patch)
tree0d02cf01e12e86365f4f5e3b234f986daef181a7 /drivers/dma/dw_dmac.c
parentc41b3810c09e60664433548c5218cc6ece6a8903 (diff)
parent17166a3b6e88b93189e6be5f7e1335a3cc4fa965 (diff)
downloadlinux-5115f3c19d17851aaff5a857f55b4a019c908775.tar.gz
Merge branch 'next' of git://git.infradead.org/users/vkoul/slave-dma
Pull slave-dmaengine updates from Vinod Koul: "This is fairly big pull by my standards as I had missed last merge window. So we have the support for device tree for slave-dmaengine, large updates to dw_dmac driver from Andy for reusing on different architectures. Along with this we have fixes on bunch of the drivers" Fix up trivial conflicts, usually due to #include line movement next to each other. * 'next' of git://git.infradead.org/users/vkoul/slave-dma: (111 commits) Revert "ARM: SPEAr13xx: Pass DW DMAC platform data from DT" ARM: dts: pl330: Add #dma-cells for generic dma binding support DMA: PL330: Register the DMA controller with the generic DMA helpers DMA: PL330: Add xlate function DMA: PL330: Add new pl330 filter for DT case. dma: tegra20-apb-dma: remove unnecessary assignment edma: do not waste memory for dma_mask dma: coh901318: set residue only if dma is in progress dma: coh901318: avoid unbalanced locking dmaengine.h: remove redundant else keyword dma: of-dma: protect list write operation by spin_lock dmaengine: ste_dma40: do not remove descriptors for cyclic transfers dma: of-dma.c: fix memory leakage dw_dmac: apply default dma_mask if needed dmaengine: ioat - fix spare sparse complain dmaengine: move drivers/of/dma.c -> drivers/dma/of-dma.c ioatdma: fix race between updating ioat->head and IOAT_COMPLETION_PENDING dw_dmac: add support for Lynxpoint DMA controllers dw_dmac: return proper residue value dw_dmac: fill individual length of descriptor ...
Diffstat (limited to 'drivers/dma/dw_dmac.c')
-rw-r--r--drivers/dma/dw_dmac.c523
1 files changed, 368 insertions, 155 deletions
diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c
index b33d1f6e133..51c3ea2ed41 100644
--- a/drivers/dma/dw_dmac.c
+++ b/drivers/dma/dw_dmac.c
@@ -1,6 +1,5 @@
/*
- * Driver for the Synopsys DesignWare DMA Controller (aka DMACA on
- * AVR32 systems.)
+ * Core driver for the Synopsys DesignWare DMA Controller
*
* Copyright (C) 2007-2008 Atmel Corporation
* Copyright (C) 2010-2011 ST Microelectronics
@@ -9,11 +8,13 @@
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
+
#include <linux/bitops.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
+#include <linux/dmapool.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/interrupt.h>
@@ -47,15 +48,32 @@ static inline unsigned int dwc_get_sms(struct dw_dma_slave *slave)
return slave ? slave->src_master : 1;
}
+#define SRC_MASTER 0
+#define DST_MASTER 1
+
+static inline unsigned int dwc_get_master(struct dma_chan *chan, int master)
+{
+ struct dw_dma *dw = to_dw_dma(chan->device);
+ struct dw_dma_slave *dws = chan->private;
+ unsigned int m;
+
+ if (master == SRC_MASTER)
+ m = dwc_get_sms(dws);
+ else
+ m = dwc_get_dms(dws);
+
+ return min_t(unsigned int, dw->nr_masters - 1, m);
+}
+
#define DWC_DEFAULT_CTLLO(_chan) ({ \
- struct dw_dma_slave *__slave = (_chan->private); \
struct dw_dma_chan *_dwc = to_dw_dma_chan(_chan); \
struct dma_slave_config *_sconfig = &_dwc->dma_sconfig; \
- int _dms = dwc_get_dms(__slave); \
- int _sms = dwc_get_sms(__slave); \
- u8 _smsize = __slave ? _sconfig->src_maxburst : \
+ bool _is_slave = is_slave_direction(_dwc->direction); \
+ int _dms = dwc_get_master(_chan, DST_MASTER); \
+ int _sms = dwc_get_master(_chan, SRC_MASTER); \
+ u8 _smsize = _is_slave ? _sconfig->src_maxburst : \
DW_DMA_MSIZE_16; \
- u8 _dmsize = __slave ? _sconfig->dst_maxburst : \
+ u8 _dmsize = _is_slave ? _sconfig->dst_maxburst : \
DW_DMA_MSIZE_16; \
\
(DWC_CTLL_DST_MSIZE(_dmsize) \
@@ -73,15 +91,14 @@ static inline unsigned int dwc_get_sms(struct dw_dma_slave *slave)
*/
#define NR_DESCS_PER_CHANNEL 64
-/*----------------------------------------------------------------------*/
+static inline unsigned int dwc_get_data_width(struct dma_chan *chan, int master)
+{
+ struct dw_dma *dw = to_dw_dma(chan->device);
-/*
- * Because we're not relying on writeback from the controller (it may not
- * even be configured into the core!) we don't need to use dma_pool. These
- * descriptors -- and associated data -- are cacheable. We do need to make
- * sure their dcache entries are written back before handing them off to
- * the controller, though.
- */
+ return dw->data_width[dwc_get_master(chan, master)];
+}
+
+/*----------------------------------------------------------------------*/
static struct device *chan2dev(struct dma_chan *chan)
{
@@ -94,7 +111,7 @@ static struct device *chan2parent(struct dma_chan *chan)
static struct dw_desc *dwc_first_active(struct dw_dma_chan *dwc)
{
- return list_entry(dwc->active_list.next, struct dw_desc, desc_node);
+ return to_dw_desc(dwc->active_list.next);
}
static struct dw_desc *dwc_desc_get(struct dw_dma_chan *dwc)
@@ -121,19 +138,6 @@ static struct dw_desc *dwc_desc_get(struct dw_dma_chan *dwc)
return ret;
}
-static void dwc_sync_desc_for_cpu(struct dw_dma_chan *dwc, struct dw_desc *desc)
-{
- struct dw_desc *child;
-
- list_for_each_entry(child, &desc->tx_list, desc_node)
- dma_sync_single_for_cpu(chan2parent(&dwc->chan),
- child->txd.phys, sizeof(child->lli),
- DMA_TO_DEVICE);
- dma_sync_single_for_cpu(chan2parent(&dwc->chan),
- desc->txd.phys, sizeof(desc->lli),
- DMA_TO_DEVICE);
-}
-
/*
* Move a descriptor, including any children, to the free list.
* `desc' must not be on any lists.
@@ -145,8 +149,6 @@ static void dwc_desc_put(struct dw_dma_chan *dwc, struct dw_desc *desc)
if (desc) {
struct dw_desc *child;
- dwc_sync_desc_for_cpu(dwc, desc);
-
spin_lock_irqsave(&dwc->lock, flags);
list_for_each_entry(child, &desc->tx_list, desc_node)
dev_vdbg(chan2dev(&dwc->chan),
@@ -179,9 +181,9 @@ static void dwc_initialize(struct dw_dma_chan *dwc)
cfghi = dws->cfg_hi;
cfglo |= dws->cfg_lo & ~DWC_CFGL_CH_PRIOR_MASK;
} else {
- if (dwc->dma_sconfig.direction == DMA_MEM_TO_DEV)
+ if (dwc->direction == DMA_MEM_TO_DEV)
cfghi = DWC_CFGH_DST_PER(dwc->dma_sconfig.slave_id);
- else if (dwc->dma_sconfig.direction == DMA_DEV_TO_MEM)
+ else if (dwc->direction == DMA_DEV_TO_MEM)
cfghi = DWC_CFGH_SRC_PER(dwc->dma_sconfig.slave_id);
}
@@ -223,7 +225,6 @@ static inline void dwc_dump_chan_regs(struct dw_dma_chan *dwc)
channel_readl(dwc, CTL_LO));
}
-
static inline void dwc_chan_disable(struct dw_dma *dw, struct dw_dma_chan *dwc)
{
channel_clear_bit(dw, CH_EN, dwc->mask);
@@ -249,6 +250,9 @@ static inline void dwc_do_single_block(struct dw_dma_chan *dwc,
channel_writel(dwc, CTL_LO, ctllo);
channel_writel(dwc, CTL_HI, desc->lli.ctlhi);
channel_set_bit(dw, CH_EN, dwc->mask);
+
+ /* Move pointer to next descriptor */
+ dwc->tx_node_active = dwc->tx_node_active->next;
}
/* Called with dwc->lock held and bh disabled */
@@ -279,9 +283,10 @@ static void dwc_dostart(struct dw_dma_chan *dwc, struct dw_desc *first)
dwc_initialize(dwc);
- dwc->tx_list = &first->tx_list;
- dwc->tx_node_active = first->tx_list.next;
+ dwc->residue = first->total_len;
+ dwc->tx_node_active = &first->tx_list;
+ /* Submit first block */
dwc_do_single_block(dwc, first);
return;
@@ -317,8 +322,6 @@ dwc_descriptor_complete(struct dw_dma_chan *dwc, struct dw_desc *desc,
param = txd->callback_param;
}
- dwc_sync_desc_for_cpu(dwc, desc);
-
/* async_tx_ack */
list_for_each_entry(child, &desc->tx_list, desc_node)
async_tx_ack(&child->txd);
@@ -327,29 +330,29 @@ dwc_descriptor_complete(struct dw_dma_chan *dwc, struct dw_desc *desc,
list_splice_init(&desc->tx_list, &dwc->free_list);
list_move(&desc->desc_node, &dwc->free_list);
- if (!dwc->chan.private) {
+ if (!is_slave_direction(dwc->direction)) {
struct device *parent = chan2parent(&dwc->chan);
if (!(txd->flags & DMA_COMPL_SKIP_DEST_UNMAP)) {
if (txd->flags & DMA_COMPL_DEST_UNMAP_SINGLE)
dma_unmap_single(parent, desc->lli.dar,
- desc->len, DMA_FROM_DEVICE);
+ desc->total_len, DMA_FROM_DEVICE);
else
dma_unmap_page(parent, desc->lli.dar,
- desc->len, DMA_FROM_DEVICE);
+ desc->total_len, DMA_FROM_DEVICE);
}
if (!(txd->flags & DMA_COMPL_SKIP_SRC_UNMAP)) {
if (txd->flags & DMA_COMPL_SRC_UNMAP_SINGLE)
dma_unmap_single(parent, desc->lli.sar,
- desc->len, DMA_TO_DEVICE);
+ desc->total_len, DMA_TO_DEVICE);
else
dma_unmap_page(parent, desc->lli.sar,
- desc->len, DMA_TO_DEVICE);
+ desc->total_len, DMA_TO_DEVICE);
}
}
spin_unlock_irqrestore(&dwc->lock, flags);
- if (callback_required && callback)
+ if (callback)
callback(param);
}
@@ -384,6 +387,15 @@ static void dwc_complete_all(struct dw_dma *dw, struct dw_dma_chan *dwc)
dwc_descriptor_complete(dwc, desc, true);
}
+/* Returns how many bytes were already received from source */
+static inline u32 dwc_get_sent(struct dw_dma_chan *dwc)
+{
+ u32 ctlhi = channel_readl(dwc, CTL_HI);
+ u32 ctllo = channel_readl(dwc, CTL_LO);
+
+ return (ctlhi & DWC_CTLH_BLOCK_TS_MASK) * (1 << (ctllo >> 4 & 7));
+}
+
static void dwc_scan_descriptors(struct dw_dma *dw, struct dw_dma_chan *dwc)
{
dma_addr_t llp;
@@ -399,6 +411,39 @@ static void dwc_scan_descriptors(struct dw_dma *dw, struct dw_dma_chan *dwc)
if (status_xfer & dwc->mask) {
/* Everything we've submitted is done */
dma_writel(dw, CLEAR.XFER, dwc->mask);
+
+ if (test_bit(DW_DMA_IS_SOFT_LLP, &dwc->flags)) {
+ struct list_head *head, *active = dwc->tx_node_active;
+
+ /*
+ * We are inside first active descriptor.
+ * Otherwise something is really wrong.
+ */
+ desc = dwc_first_active(dwc);
+
+ head = &desc->tx_list;
+ if (active != head) {
+ /* Update desc to reflect last sent one */
+ if (active != head->next)
+ desc = to_dw_desc(active->prev);
+
+ dwc->residue -= desc->len;
+
+ child = to_dw_desc(active);
+
+ /* Submit next block */
+ dwc_do_single_block(dwc, child);
+
+ spin_unlock_irqrestore(&dwc->lock, flags);
+ return;
+ }
+
+ /* We are done here */
+ clear_bit(DW_DMA_IS_SOFT_LLP, &dwc->flags);
+ }
+
+ dwc->residue = 0;
+
spin_unlock_irqrestore(&dwc->lock, flags);
dwc_complete_all(dw, dwc);
@@ -406,6 +451,13 @@ static void dwc_scan_descriptors(struct dw_dma *dw, struct dw_dma_chan *dwc)
}
if (list_empty(&dwc->active_list)) {
+ dwc->residue = 0;
+ spin_unlock_irqrestore(&dwc->lock, flags);
+ return;
+ }
+
+ if (test_bit(DW_DMA_IS_SOFT_LLP, &dwc->flags)) {
+ dev_vdbg(chan2dev(&dwc->chan), "%s: soft LLP mode\n", __func__);
spin_unlock_irqrestore(&dwc->lock, flags);
return;
}
@@ -414,6 +466,9 @@ static void dwc_scan_descriptors(struct dw_dma *dw, struct dw_dma_chan *dwc)
(unsigned long long)llp);
list_for_each_entry_safe(desc, _desc, &dwc->active_list, desc_node) {
+ /* initial residue value */
+ dwc->residue = desc->total_len;
+
/* check first descriptors addr */
if (desc->txd.phys == llp) {
spin_unlock_irqrestore(&dwc->lock, flags);
@@ -423,16 +478,21 @@ static void dwc_scan_descriptors(struct dw_dma *dw, struct dw_dma_chan *dwc)
/* check first descriptors llp */
if (desc->lli.llp == llp) {
/* This one is currently in progress */
+ dwc->residue -= dwc_get_sent(dwc);
spin_unlock_irqrestore(&dwc->lock, flags);
return;
}
- list_for_each_entry(child, &desc->tx_list, desc_node)
+ dwc->residue -= desc->len;
+ list_for_each_entry(child, &desc->tx_list, desc_node) {
if (child->lli.llp == llp) {
/* Currently in progress */
+ dwc->residue -= dwc_get_sent(dwc);
spin_unlock_irqrestore(&dwc->lock, flags);
return;
}
+ dwc->residue -= child->len;
+ }
/*
* No descriptors so far seem to be in progress, i.e.
@@ -458,9 +518,8 @@ static void dwc_scan_descriptors(struct dw_dma *dw, struct dw_dma_chan *dwc)
static inline void dwc_dump_lli(struct dw_dma_chan *dwc, struct dw_lli *lli)
{
- dev_printk(KERN_CRIT, chan2dev(&dwc->chan),
- " desc: s0x%x d0x%x l0x%x c0x%x:%x\n",
- lli->sar, lli->dar, lli->llp, lli->ctlhi, lli->ctllo);
+ dev_crit(chan2dev(&dwc->chan), " desc: s0x%x d0x%x l0x%x c0x%x:%x\n",
+ lli->sar, lli->dar, lli->llp, lli->ctlhi, lli->ctllo);
}
static void dwc_handle_error(struct dw_dma *dw, struct dw_dma_chan *dwc)
@@ -488,16 +547,14 @@ static void dwc_handle_error(struct dw_dma *dw, struct dw_dma_chan *dwc)
dwc_dostart(dwc, dwc_first_active(dwc));
/*
- * KERN_CRITICAL may seem harsh, but since this only happens
+ * WARN may seem harsh, but since this only happens
* when someone submits a bad physical address in a
* descriptor, we should consider ourselves lucky that the
* controller flagged an error instead of scribbling over
* random memory locations.
*/
- dev_printk(KERN_CRIT, chan2dev(&dwc->chan),
- "Bad descriptor submitted for DMA!\n");
- dev_printk(KERN_CRIT, chan2dev(&dwc->chan),
- " cookie: %d\n", bad_desc->txd.cookie);
+ dev_WARN(chan2dev(&dwc->chan), "Bad descriptor submitted for DMA!\n"
+ " cookie: %d\n", bad_desc->txd.cookie);
dwc_dump_lli(dwc, &bad_desc->lli);
list_for_each_entry(child, &bad_desc->tx_list, desc_node)
dwc_dump_lli(dwc, &child->lli);
@@ -598,36 +655,8 @@ static void dw_dma_tasklet(unsigned long data)
dwc_handle_cyclic(dw, dwc, status_err, status_xfer);
else if (status_err & (1 << i))
dwc_handle_error(dw, dwc);
- else if (status_xfer & (1 << i)) {
- unsigned long flags;
-
- spin_lock_irqsave(&dwc->lock, flags);
- if (test_bit(DW_DMA_IS_SOFT_LLP, &dwc->flags)) {
- if (dwc->tx_node_active != dwc->tx_list) {
- struct dw_desc *desc =
- list_entry(dwc->tx_node_active,
- struct dw_desc,
- desc_node);
-
- dma_writel(dw, CLEAR.XFER, dwc->mask);
-
- /* move pointer to next descriptor */
- dwc->tx_node_active =
- dwc->tx_node_active->next;
-
- dwc_do_single_block(dwc, desc);
-
- spin_unlock_irqrestore(&dwc->lock, flags);
- continue;
- } else {
- /* we are done here */
- clear_bit(DW_DMA_IS_SOFT_LLP, &dwc->flags);
- }
- }
- spin_unlock_irqrestore(&dwc->lock, flags);
-
+ else if (status_xfer & (1 << i))
dwc_scan_descriptors(dw, dwc);
- }
}
/*
@@ -709,7 +738,6 @@ dwc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
size_t len, unsigned long flags)
{
struct dw_dma_chan *dwc = to_dw_dma_chan(chan);
- struct dw_dma_slave *dws = chan->private;
struct dw_desc *desc;
struct dw_desc *first;
struct dw_desc *prev;
@@ -730,8 +758,10 @@ dwc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
return NULL;
}
- data_width = min_t(unsigned int, dwc->dw->data_width[dwc_get_sms(dws)],
- dwc->dw->data_width[dwc_get_dms(dws)]);
+ dwc->direction = DMA_MEM_TO_MEM;
+
+ data_width = min_t(unsigned int, dwc_get_data_width(chan, SRC_MASTER),
+ dwc_get_data_width(chan, DST_MASTER));
src_width = dst_width = min_t(unsigned int, data_width,
dwc_fast_fls(src | dest | len));
@@ -756,32 +786,25 @@ dwc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
desc->lli.dar = dest + offset;
desc->lli.ctllo = ctllo;
desc->lli.ctlhi = xfer_count;
+ desc->len = xfer_count << src_width;
if (!first) {
first = desc;
} else {
prev->lli.llp = desc->txd.phys;
- dma_sync_single_for_device(chan2parent(chan),
- prev->txd.phys, sizeof(prev->lli),
- DMA_TO_DEVICE);
list_add_tail(&desc->desc_node,
&first->tx_list);
}
prev = desc;
}
-
if (flags & DMA_PREP_INTERRUPT)
/* Trigger interrupt after last block */
prev->lli.ctllo |= DWC_CTLL_INT_EN;
prev->lli.llp = 0;
- dma_sync_single_for_device(chan2parent(chan),
- prev->txd.phys, sizeof(prev->lli),
- DMA_TO_DEVICE);
-
first->txd.flags = flags;
- first->len = len;
+ first->total_len = len;
return &first->txd;
@@ -796,7 +819,6 @@ dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
unsigned long flags, void *context)
{
struct dw_dma_chan *dwc = to_dw_dma_chan(chan);
- struct dw_dma_slave *dws = chan->private;
struct dma_slave_config *sconfig = &dwc->dma_sconfig;
struct dw_desc *prev;
struct dw_desc *first;
@@ -811,9 +833,11 @@ dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
dev_vdbg(chan2dev(chan), "%s\n", __func__);
- if (unlikely(!dws || !sg_len))
+ if (unlikely(!is_slave_direction(direction) || !sg_len))
return NULL;
+ dwc->direction = direction;
+
prev = first = NULL;
switch (direction) {
@@ -828,7 +852,7 @@ dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
ctllo |= sconfig->device_fc ? DWC_CTLL_FC(DW_DMA_FC_P_M2P) :
DWC_CTLL_FC(DW_DMA_FC_D_M2P);
- data_width = dwc->dw->data_width[dwc_get_sms(dws)];
+ data_width = dwc_get_data_width(chan, SRC_MASTER);
for_each_sg(sgl, sg, sg_len, i) {
struct dw_desc *desc;
@@ -861,15 +885,12 @@ slave_sg_todev_fill_desc:
}
desc->lli.ctlhi = dlen >> mem_width;
+ desc->len = dlen;
if (!first) {
first = desc;
} else {
prev->lli.llp = desc->txd.phys;
- dma_sync_single_for_device(chan2parent(chan),
- prev->txd.phys,
- sizeof(prev->lli),
- DMA_TO_DEVICE);
list_add_tail(&desc->desc_node,
&first->tx_list);
}
@@ -891,7 +912,7 @@ slave_sg_todev_fill_desc:
ctllo |= sconfig->device_fc ? DWC_CTLL_FC(DW_DMA_FC_P_P2M) :
DWC_CTLL_FC(DW_DMA_FC_D_P2M);
- data_width = dwc->dw->data_width[dwc_get_dms(dws)];
+ data_width = dwc_get_data_width(chan, DST_MASTER);
for_each_sg(sgl, sg, sg_len, i) {
struct dw_desc *desc;
@@ -923,15 +944,12 @@ slave_sg_fromdev_fill_desc:
len = 0;
}
desc->lli.ctlhi = dlen >> reg_width;
+ desc->len = dlen;
if (!first) {
first = desc;
} else {
prev->lli.llp = desc->txd.phys;
- dma_sync_single_for_device(chan2parent(chan),
- prev->txd.phys,
- sizeof(prev->lli),
- DMA_TO_DEVICE);
list_add_tail(&desc->desc_node,
&first->tx_list);
}
@@ -951,11 +969,7 @@ slave_sg_fromdev_fill_desc:
prev->lli.ctllo |= DWC_CTLL_INT_EN;
prev->lli.llp = 0;
- dma_sync_single_for_device(chan2parent(chan),
- prev->txd.phys, sizeof(prev->lli),
- DMA_TO_DEVICE);
-
- first->len = total_len;
+ first->total_len = total_len;
return &first->txd;
@@ -985,11 +999,12 @@ set_runtime_config(struct dma_chan *chan, struct dma_slave_config *sconfig)
{
struct dw_dma_chan *dwc = to_dw_dma_chan(chan);
- /* Check if it is chan is configured for slave transfers */
- if (!chan->private)
+ /* Check if chan will be configured for slave transfers */
+ if (!is_slave_direction(sconfig->direction))
return -EINVAL;
memcpy(&dwc->dma_sconfig, sconfig, sizeof(*sconfig));
+ dwc->direction = sconfig->direction;
convert_burst(&dwc->dma_sconfig.src_maxburst);
convert_burst(&dwc->dma_sconfig.dst_maxburst);
@@ -997,6 +1012,26 @@ set_runtime_config(struct dma_chan *chan, struct dma_slave_config *sconfig)
return 0;
}
+static inline void dwc_chan_pause(struct dw_dma_chan *dwc)
+{
+ u32 cfglo = channel_readl(dwc, CFG_LO);
+
+ channel_writel(dwc, CFG_LO, cfglo | DWC_CFGL_CH_SUSP);
+ while (!(channel_readl(dwc, CFG_LO) & DWC_CFGL_FIFO_EMPTY))
+ cpu_relax();
+
+ dwc->paused = true;
+}
+
+static inline void dwc_chan_resume(struct dw_dma_chan *dwc)
+{
+ u32 cfglo = channel_readl(dwc, CFG_LO);
+
+ channel_writel(dwc, CFG_LO, cfglo & ~DWC_CFGL_CH_SUSP);
+
+ dwc->paused = false;
+}
+
static int dwc_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
unsigned long arg)
{
@@ -1004,18 +1039,13 @@ static int dwc_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
struct dw_dma *dw = to_dw_dma(chan->device);
struct dw_desc *desc, *_desc;
unsigned long flags;
- u32 cfglo;
LIST_HEAD(list);
if (cmd == DMA_PAUSE) {
spin_lock_irqsave(&dwc->lock, flags);
- cfglo = channel_readl(dwc, CFG_LO);
- channel_writel(dwc, CFG_LO, cfglo | DWC_CFGL_CH_SUSP);
- while (!(channel_readl(dwc, CFG_LO) & DWC_CFGL_FIFO_EMPTY))
- cpu_relax();
+ dwc_chan_pause(dwc);
- dwc->paused = true;
spin_unlock_irqrestore(&dwc->lock, flags);
} else if (cmd == DMA_RESUME) {
if (!dwc->paused)
@@ -1023,9 +1053,7 @@ static int dwc_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
spin_lock_irqsave(&dwc->lock, flags);
- cfglo = channel_readl(dwc, CFG_LO);
- channel_writel(dwc, CFG_LO, cfglo & ~DWC_CFGL_CH_SUSP);
- dwc->paused = false;
+ dwc_chan_resume(dwc);
spin_unlock_irqrestore(&dwc->lock, flags);
} else if (cmd == DMA_TERMINATE_ALL) {
@@ -1035,7 +1063,7 @@ static int dwc_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
dwc_chan_disable(dw, dwc);
- dwc->paused = false;
+ dwc_chan_resume(dwc);
/* active_list entries will end up before queued entries */
list_splice_init(&dwc->queue, &list);
@@ -1055,6 +1083,21 @@ static int dwc_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
return 0;
}
+static inline u32 dwc_get_residue(struct dw_dma_chan *dwc)
+{
+ unsigned long flags;
+ u32 residue;
+
+ spin_lock_irqsave(&dwc->lock, flags);
+
+ residue = dwc->residue;
+ if (test_bit(DW_DMA_IS_SOFT_LLP, &dwc->flags) && residue)
+ residue -= dwc_get_sent(dwc);
+
+ spin_unlock_irqrestore(&dwc->lock, flags);
+ return residue;
+}
+
static enum dma_status
dwc_tx_status(struct dma_chan *chan,
dma_cookie_t cookie,
@@ -1071,7 +1114,7 @@ dwc_tx_status(struct dma_chan *chan,
}
if (ret != DMA_SUCCESS)
- dma_set_residue(txstate, dwc_first_active(dwc)->len);
+ dma_set_residue(txstate, dwc_get_residue(dwc));
if (dwc->paused)
return DMA_PAUSED;
@@ -1114,22 +1157,22 @@ static int dwc_alloc_chan_resources(struct dma_chan *chan)
spin_lock_irqsave(&dwc->lock, flags);
i = dwc->descs_allocated;
while (dwc->descs_allocated < NR_DESCS_PER_CHANNEL) {
+ dma_addr_t phys;
+
spin_unlock_irqrestore(&dwc->lock, flags);
- desc = kzalloc(sizeof(struct dw_desc), GFP_KERNEL);
- if (!desc) {
- dev_info(chan2dev(chan),
- "only allocated %d descriptors\n", i);
- spin_lock_irqsave(&dwc->lock, flags);
- break;
- }
+ desc = dma_pool_alloc(dw->desc_pool, GFP_ATOMIC, &phys);
+ if (!desc)
+ goto err_desc_alloc;
+
+ memset(desc, 0, sizeof(struct dw_desc));
INIT_LIST_HEAD(&desc->tx_list);
dma_async_tx_descriptor_init(&desc->txd, chan);
desc->txd.tx_submit = dwc_tx_submit;
desc->txd.flags = DMA_CTRL_ACK;
- desc->txd.phys = dma_map_single(chan2parent(chan), &desc->lli,
- sizeof(desc->lli), DMA_TO_DEVICE);
+ desc->txd.phys = phys;
+
dwc_desc_put(dwc, desc);
spin_lock_irqsave(&dwc->lock, flags);
@@ -1141,6 +1184,11 @@ static int dwc_alloc_chan_resources(struct dma_chan *chan)
dev_dbg(chan2dev(chan), "%s: allocated %d descriptors\n", __func__, i);
return i;
+
+err_desc_alloc:
+ dev_info(chan2dev(chan), "only allocated %d descriptors\n", i);
+
+ return i;
}
static void dwc_free_chan_resources(struct dma_chan *chan)
@@ -1172,14 +1220,56 @@ static void dwc_free_chan_resources(struct dma_chan *chan)
list_for_each_entry_safe(desc, _desc, &list, desc_node) {
dev_vdbg(chan2dev(chan), " freeing descriptor %p\n", desc);
- dma_unmap_single(chan2parent(chan), desc->txd.phys,
- sizeof(desc->lli), DMA_TO_DEVICE);
- kfree(desc);
+ dma_pool_free(dw->desc_pool, desc, desc->txd.phys);
}
dev_vdbg(chan2dev(chan), "%s: done\n", __func__);
}
+bool dw_dma_generic_filter(struct dma_chan *chan, void *param)
+{
+ struct dw_dma *dw = to_dw_dma(chan->device);
+ static struct dw_dma *last_dw;
+ static char *last_bus_id;
+ int i = -1;
+
+ /*
+ * dmaengine framework calls this routine for all channels of all dma
+ * controller, until true is returned. If 'param' bus_id is not
+ * registered with a dma controller (dw), then there is no need of
+ * running below function for all channels of dw.
+ *
+ * This block of code does this by saving the parameters of last
+ * failure. If dw and param are same, i.e. trying on same dw with
+ * different channel, return false.
+ */
+ if ((last_dw == dw) && (last_bus_id == param))
+ return false;
+ /*
+ * Return true:
+ * - If dw_dma's platform data is not filled with slave info, then all
+ * dma controllers are fine for transfer.
+ * - Or if param is NULL
+ */
+ if (!dw->sd || !param)
+ return true;
+
+ while (++i < dw->sd_count) {
+ if (!strcmp(dw->sd[i].bus_id, param)) {
+ chan->private = &dw->sd[i];
+ last_dw = NULL;
+ last_bus_id = NULL;
+
+ return true;
+ }
+ }
+
+ last_dw = dw;
+ last_bus_id = param;
+ return false;
+}
+EXPORT_SYMBOL(dw_dma_generic_filter);
+
/* --------------------- Cyclic DMA API extensions -------------------- */
/**
@@ -1299,6 +1389,11 @@ struct dw_cyclic_desc *dw_dma_cyclic_prep(struct dma_chan *chan,
retval = ERR_PTR(-EINVAL);
+ if (unlikely(!is_slave_direction(direction)))
+ goto out_err;
+
+ dwc->direction = direction;
+
if (direction == DMA_MEM_TO_DEV)
reg_width = __ffs(sconfig->dst_addr_width);
else
@@ -1313,8 +1408,6 @@ struct dw_cyclic_desc *dw_dma_cyclic_prep(struct dma_chan *chan,
goto out_err;
if (unlikely(buf_addr & ((1 << reg_width) - 1)))
goto out_err;
- if (unlikely(!(direction & (DMA_MEM_TO_DEV | DMA_DEV_TO_MEM))))
- goto out_err;
retval = ERR_PTR(-ENOMEM);
@@ -1372,20 +1465,14 @@ struct dw_cyclic_desc *dw_dma_cyclic_prep(struct dma_chan *chan,
desc->lli.ctlhi = (period_len >> reg_width);
cdesc->desc[i] = desc;
- if (last) {
+ if (last)
last->lli.llp = desc->txd.phys;
- dma_sync_single_for_device(chan2parent(chan),
- last->txd.phys, sizeof(last->lli),
- DMA_TO_DEVICE);
- }
last = desc;
}
/* lets make a cyclic list */
last->lli.llp = cdesc->desc[0]->txd.phys;
- dma_sync_single_for_device(chan2parent(chan), last->txd.phys,
- sizeof(last->lli), DMA_TO_DEVICE);
dev_dbg(chan2dev(&dwc->chan), "cyclic prepared buf 0x%llx len %zu "
"period %zu periods %d\n", (unsigned long long)buf_addr,
@@ -1463,6 +1550,91 @@ static void dw_dma_off(struct dw_dma *dw)
dw->chan[i].initialized = false;
}
+#ifdef CONFIG_OF
+static struct dw_dma_platform_data *
+dw_dma_parse_dt(struct platform_device *pdev)
+{
+ struct device_node *sn, *cn, *np = pdev->dev.of_node;
+ struct dw_dma_platform_data *pdata;
+ struct dw_dma_slave *sd;
+ u32 tmp, arr[4];
+
+ if (!np) {
+ dev_err(&pdev->dev, "Missing DT data\n");
+ return NULL;
+ }
+
+ pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return NULL;
+
+ if (of_property_read_u32(np, "nr_channels", &pdata->nr_channels))
+ return NULL;
+
+ if (of_property_read_bool(np, "is_private"))
+ pdata->is_private = true;
+
+ if (!of_property_read_u32(np, "chan_allocation_order", &tmp))
+ pdata->chan_allocation_order = (unsigned char)tmp;
+
+ if (!of_property_read_u32(np, "chan_priority", &tmp))
+ pdata->chan_priority = tmp;
+
+ if (!of_property_read_u32(np, "block_size", &tmp))
+ pdata->block_size = tmp;
+
+ if (!of_property_read_u32(np, "nr_masters", &tmp)) {
+ if (tmp > 4)
+ return NULL;
+
+ pdata->nr_masters = tmp;
+ }
+
+ if (!of_property_read_u32_array(np, "data_width", arr,
+ pdata->nr_masters))
+ for (tmp = 0; tmp < pdata->nr_masters; tmp++)
+ pdata->data_width[tmp] = arr[tmp];
+
+ /* parse slave data */
+ sn = of_find_node_by_name(np, "slave_info");
+ if (!sn)
+ return pdata;
+
+ /* calculate number of slaves */
+ tmp = of_get_child_count(sn);
+ if (!tmp)
+ return NULL;
+
+ sd = devm_kzalloc(&pdev->dev, sizeof(*sd) * tmp, GFP_KERNEL);
+ if (!sd)
+ return NULL;
+
+ pdata->sd = sd;
+ pdata->sd_count = tmp;
+
+ for_each_child_of_node(sn, cn) {
+ sd->dma_dev = &pdev->dev;
+ of_property_read_string(cn, "bus_id", &sd->bus_id);
+ of_property_read_u32(cn, "cfg_hi", &sd->cfg_hi);
+ of_property_read_u32(cn, "cfg_lo", &sd->cfg_lo);
+ if (!of_property_read_u32(cn, "src_master", &tmp))
+ sd->src_master = tmp;
+
+ if (!of_property_read_u32(cn, "dst_master", &tmp))
+ sd->dst_master = tmp;
+ sd++;
+ }
+
+ return pdata;
+}
+#else
+static inline struct dw_dma_platform_data *
+dw_dma_parse_dt(struct platform_device *pdev)
+{
+ return NULL;
+}
+#endif
+
static int dw_probe(struct platform_device *pdev)
{
struct dw_dma_platform_data *pdata;
@@ -1478,10 +1650,6 @@ static int dw_probe(struct platform_device *pdev)
int err;
int i;
- pdata = dev_get_platdata(&pdev->dev);
- if (!pdata || pdata->nr_channels > DW_DMA_MAX_NR_CHANNELS)
- return -EINVAL;
-
io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!io)
return -EINVAL;
@@ -1494,9 +1662,33 @@ static int dw_probe(struct platform_device *pdev)
if (IS_ERR(regs))
return PTR_ERR(regs);
+ /* Apply default dma_mask if needed */
+ if (!pdev->dev.dma_mask) {
+ pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
+ pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
+ }
+
dw_params = dma_read_byaddr(regs, DW_PARAMS);
autocfg = dw_params >> DW_PARAMS_EN & 0x1;
+ dev_dbg(&pdev->dev, "DW_PARAMS: 0x%08x\n", dw_params);
+
+ pdata = dev_get_platdata(&pdev->dev);
+ if (!pdata)
+ pdata = dw_dma_parse_dt(pdev);
+
+ if (!pdata && autocfg) {
+ pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return -ENOMEM;
+
+ /* Fill platform data with the default values */
+ pdata->is_private = true;
+ pdata->chan_allocation_order = CHAN_ALLOCATION_ASCENDING;
+ pdata->chan_priority = CHAN_PRIORITY_ASCENDING;
+ } else if (!pdata || pdata->nr_channels > DW_DMA_MAX_NR_CHANNELS)
+ return -EINVAL;
+
if (autocfg)
nr_channels = (dw_params >> DW_PARAMS_NR_CHAN & 0x7) + 1;
else
@@ -1513,6 +1705,8 @@ static int dw_probe(struct platform_device *pdev)
clk_prepare_enable(dw->clk);
dw->regs = regs;
+ dw->sd = pdata->sd;
+ dw->sd_count = pdata->sd_count;
/* get hardware configuration parameters */
if (autocfg) {
@@ -1544,6 +1738,14 @@ static int dw_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, dw);
+ /* create a pool of consistent memory blocks for hardware descriptors */
+ dw->desc_pool = dmam_pool_create("dw_dmac_desc_pool", &pdev->dev,
+ sizeof(struct dw_desc), 4, 0);
+ if (!dw->desc_pool) {
+ dev_err(&pdev->dev, "No memory for descriptors dma pool\n");
+ return -ENOMEM;
+ }
+
tasklet_init(&dw->tasklet, dw_dma_tasklet, (unsigned long)dw);
INIT_LIST_HEAD(&dw->dma.channels);
@@ -1575,7 +1777,7 @@ static int dw_probe(struct platform_device *pdev)
channel_clear_bit(dw, CH_EN, dwc->mask);
- dwc->dw = dw;
+ dwc->direction = DMA_TRANS_NONE;
/* hardware configuration */
if (autocfg) {
@@ -1584,6 +1786,9 @@ static int dw_probe(struct platform_device *pdev)
dwc_params = dma_read_byaddr(regs + r * sizeof(u32),
DWC_PARAMS);
+ dev_dbg(&pdev->dev, "DWC_PARAMS[%d]: 0x%08x\n", i,
+ dwc_params);
+
/* Decode maximum block size for given channel. The
* stored 4 bit value represents blocks from 0x00 for 3
* up to 0x0a for 4095. */
@@ -1627,8 +1832,8 @@ static int dw_probe(struct platform_device *pdev)
dma_writel(dw, CFG, DW_CFG_DMA_EN);
- printk(KERN_INFO "%s: DesignWare DMA Controller, %d channels\n",
- dev_name(&pdev->dev), nr_channels);
+ dev_info(&pdev->dev, "DesignWare DMA Controller, %d channels\n",
+ nr_channels);
dma_async_device_register(&dw->dma);
@@ -1658,7 +1863,7 @@ static void dw_shutdown(struct platform_device *pdev)
{
struct dw_dma *dw = platform_get_drvdata(pdev);
- dw_dma_off(platform_get_drvdata(pdev));
+ dw_dma_off(dw);
clk_disable_unprepare(dw->clk);
}
@@ -1667,7 +1872,7 @@ static int dw_suspend_noirq(struct device *dev)
struct platform_device *pdev = to_platform_device(dev);
struct dw_dma *dw = platform_get_drvdata(pdev);
- dw_dma_off(platform_get_drvdata(pdev));
+ dw_dma_off(dw);
clk_disable_unprepare(dw->clk);
return 0;
@@ -1680,6 +1885,7 @@ static int dw_resume_noirq(struct device *dev)
clk_prepare_enable(dw->clk);
dma_writel(dw, CFG, DW_CFG_DMA_EN);
+
return 0;
}
@@ -1700,7 +1906,13 @@ static const struct of_device_id dw_dma_id_table[] = {
MODULE_DEVICE_TABLE(of, dw_dma_id_table);
#endif
+static const struct platform_device_id dw_dma_ids[] = {
+ { "INTL9C60", 0 },
+ { }
+};
+
static struct platform_driver dw_driver = {
+ .probe = dw_probe,
.remove = dw_remove,
.shutdown = dw_shutdown,
.driver = {
@@ -1708,11 +1920,12 @@ static struct platform_driver dw_driver = {
.pm = &dw_dev_pm_ops,
.of_match_table = of_match_ptr(dw_dma_id_table),
},
+ .id_table = dw_dma_ids,
};
static int __init dw_init(void)
{
- return platform_driver_probe(&dw_driver, dw_probe);
+ return platform_driver_register(&dw_driver);
}
subsys_initcall(dw_init);