Re: [PATCH V9 1/4] dma-mapping: Rework dma_get_cache_alignment()

From: Marek Szyprowski
Date: Tue Oct 24 2017 - 09:31:16 EST

Hi Huacai,

On 2017-10-23 09:12, Huacai Chen wrote:
Make dma_get_cache_alignment() to accept a 'dev' argument. As a result,
it can return different alignments due to different devices' I/O cache
coherency.

Currently, ARM/ARM64 and MIPS support coherent & noncoherent devices
co-exist. This may be extended in the future, so add a new function
pointer (i.e, get_cache_alignment) in 'struct dma_map_ops' as a generic
solution.

Cc: stable@xxxxxxxxxxxxxxx

I don't think this change should go to stable.

Cc: Michael S. Tsirkin <mst@xxxxxxxxxx>
Cc: Pawel Osciak <pawel@xxxxxxxxxx>
Cc: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Cc: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
Cc: Michael Chan <michael.chan@xxxxxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Ivan Mikhaylov <ivan@xxxxxxxxxx>
Cc: Tariq Toukan <tariqt@xxxxxxxxxxxx>
Cc: Andy Gross <agross@xxxxxxxxxxxxxx>
Cc: Mark A. Greer <mgreer@xxxxxxxxxxxxxxx>
Cc: Robert Baldyga <r.baldyga@xxxxxxxxxxxxx>
Cc: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Signed-off-by: Huacai Chen <chenhc@xxxxxxxxxx>
---
drivers/infiniband/hw/mthca/mthca_main.c | 2 +-
drivers/media/v4l2-core/videobuf2-dma-contig.c | 2 +-
drivers/net/ethernet/broadcom/b44.c | 8 +-
drivers/net/ethernet/ibm/emac/core.c | 32 +++--
drivers/net/ethernet/ibm/emac/core.h | 14 +-
drivers/net/ethernet/mellanox/mlx4/main.c | 2 +-
drivers/spi/spi-qup.c | 4 +-
drivers/tty/serial/mpsc.c | 179 +++++++++++++------------
drivers/tty/serial/samsung.c | 14 +-
include/linux/dma-mapping.h | 17 ++-

For videobuf2-dma-contig, serial/samsung and dma-mapping.h:

Acked-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>


10 files changed, 150 insertions(+), 124 deletions(-)

diff --git a/drivers/infiniband/hw/mthca/mthca_main.c b/drivers/infiniband/hw/mthca/mthca_main.c
index e36a9bc..078fe8d 100644
--- a/drivers/infiniband/hw/mthca/mthca_main.c
+++ b/drivers/infiniband/hw/mthca/mthca_main.c
@@ -416,7 +416,7 @@ static int mthca_init_icm(struct mthca_dev *mdev,
/* CPU writes to non-reserved MTTs, while HCA might DMA to reserved mtts */
mdev->limits.reserved_mtts = ALIGN(mdev->limits.reserved_mtts * mdev->limits.mtt_seg_size,
- dma_get_cache_alignment()) / mdev->limits.mtt_seg_size;
+ dma_get_cache_alignment(&mdev->pdev->dev)) / mdev->limits.mtt_seg_size;
mdev->mr_table.mtt_table = mthca_alloc_icm_table(mdev, init_hca->mtt_base,
mdev->limits.mtt_seg_size,
diff --git a/drivers/media/v4l2-core/videobuf2-dma-contig.c b/drivers/media/v4l2-core/videobuf2-dma-contig.c
index 9f389f3..1f6a9b7 100644
--- a/drivers/media/v4l2-core/videobuf2-dma-contig.c
+++ b/drivers/media/v4l2-core/videobuf2-dma-contig.c
@@ -484,7 +484,7 @@ static void *vb2_dc_get_userptr(struct device *dev, unsigned long vaddr,
int ret = 0;
struct sg_table *sgt;
unsigned long contig_size;
- unsigned long dma_align = dma_get_cache_alignment();
+ unsigned long dma_align = dma_get_cache_alignment(dev);
/* Only cache aligned DMA transfers are reliable */
if (!IS_ALIGNED(vaddr | size, dma_align)) {
diff --git a/drivers/net/ethernet/broadcom/b44.c b/drivers/net/ethernet/broadcom/b44.c
index a1125d1..2f6ffe5 100644
--- a/drivers/net/ethernet/broadcom/b44.c
+++ b/drivers/net/ethernet/broadcom/b44.c
@@ -2344,6 +2344,10 @@ static int b44_init_one(struct ssb_device *sdev,
struct net_device *dev;
struct b44 *bp;
int err;
+ unsigned int dma_desc_align_size = dma_get_cache_alignment(sdev->dma_dev);
+
+ /* Setup paramaters for syncing RX/TX DMA descriptors */
+ dma_desc_sync_size = max_t(unsigned int, dma_desc_align_size, sizeof(struct dma_desc));
instance++;
@@ -2587,12 +2591,8 @@ static inline void b44_pci_exit(void)
static int __init b44_init(void)
{
- unsigned int dma_desc_align_size = dma_get_cache_alignment();
int err;
- /* Setup paramaters for syncing RX/TX DMA descriptors */
- dma_desc_sync_size = max_t(unsigned int, dma_desc_align_size, sizeof(struct dma_desc));
-
err = b44_pci_init();
if (err)
return err;
diff --git a/drivers/net/ethernet/ibm/emac/core.c b/drivers/net/ethernet/ibm/emac/core.c
index 7feff24..8dcebb2 100644
--- a/drivers/net/ethernet/ibm/emac/core.c
+++ b/drivers/net/ethernet/ibm/emac/core.c
@@ -1030,8 +1030,9 @@ static int emac_set_mac_address(struct net_device *ndev, void *sa)
static int emac_resize_rx_ring(struct emac_instance *dev, int new_mtu)
{
- int rx_sync_size = emac_rx_sync_size(new_mtu);
- int rx_skb_size = emac_rx_skb_size(new_mtu);
+ struct device *dma_dev = &dev->ofdev->dev;
+ int rx_skb_size = emac_rx_skb_size(dma_dev, new_mtu);
+ int rx_sync_size = emac_rx_sync_size(dma_dev, new_mtu);
int i, ret = 0;
int mr1_jumbo_bit_change = 0;
@@ -1074,7 +1075,7 @@ static int emac_resize_rx_ring(struct emac_instance *dev, int new_mtu)
BUG_ON(!dev->rx_skb[i]);
dev_kfree_skb(dev->rx_skb[i]);
- skb_reserve(skb, EMAC_RX_SKB_HEADROOM + 2);
+ skb_reserve(skb, EMAC_RX_SKB_HEADROOM(dma_dev) + 2);
dev->rx_desc[i].data_ptr =
dma_map_single(&dev->ofdev->dev, skb->data - 2, rx_sync_size,
DMA_FROM_DEVICE) + 2;
@@ -1115,20 +1116,21 @@ static int emac_resize_rx_ring(struct emac_instance *dev, int new_mtu)
static int emac_change_mtu(struct net_device *ndev, int new_mtu)
{
struct emac_instance *dev = netdev_priv(ndev);
+ struct device *dma_dev = &dev->ofdev->dev;
int ret = 0;
DBG(dev, "change_mtu(%d)" NL, new_mtu);
if (netif_running(ndev)) {
/* Check if we really need to reinitialize RX ring */
- if (emac_rx_skb_size(ndev->mtu) != emac_rx_skb_size(new_mtu))
+ if (emac_rx_skb_size(dma_dev, ndev->mtu) != emac_rx_skb_size(dma_dev, new_mtu))
ret = emac_resize_rx_ring(dev, new_mtu);
}
if (!ret) {
ndev->mtu = new_mtu;
- dev->rx_skb_size = emac_rx_skb_size(new_mtu);
- dev->rx_sync_size = emac_rx_sync_size(new_mtu);
+ dev->rx_skb_size = emac_rx_skb_size(dma_dev, new_mtu);
+ dev->rx_sync_size = emac_rx_sync_size(dma_dev, new_mtu);
}
return ret;
@@ -1171,6 +1173,7 @@ static void emac_clean_rx_ring(struct emac_instance *dev)
static inline int emac_alloc_rx_skb(struct emac_instance *dev, int slot,
gfp_t flags)
{
+ struct device *dma_dev = &dev->ofdev->dev;
struct sk_buff *skb = alloc_skb(dev->rx_skb_size, flags);
if (unlikely(!skb))
return -ENOMEM;
@@ -1178,7 +1181,7 @@ static inline int emac_alloc_rx_skb(struct emac_instance *dev, int slot,
dev->rx_skb[slot] = skb;
dev->rx_desc[slot].data_len = 0;
- skb_reserve(skb, EMAC_RX_SKB_HEADROOM + 2);
+ skb_reserve(skb, EMAC_RX_SKB_HEADROOM(dma_dev) + 2);
dev->rx_desc[slot].data_ptr =
dma_map_single(&dev->ofdev->dev, skb->data - 2, dev->rx_sync_size,
DMA_FROM_DEVICE) + 2;
@@ -1649,12 +1652,13 @@ static inline void emac_recycle_rx_skb(struct emac_instance *dev, int slot,
int len)
{
struct sk_buff *skb = dev->rx_skb[slot];
+ struct device *dma_dev = &dev->ofdev->dev;
DBG2(dev, "recycle %d %d" NL, slot, len);
if (len)
- dma_map_single(&dev->ofdev->dev, skb->data - 2,
- EMAC_DMA_ALIGN(len + 2), DMA_FROM_DEVICE);
+ dma_map_single(dma_dev, skb->data - 2,
+ EMAC_DMA_ALIGN(dma_dev, len + 2), DMA_FROM_DEVICE);
dev->rx_desc[slot].data_len = 0;
wmb();
@@ -1727,6 +1731,7 @@ static int emac_poll_rx(void *param, int budget)
{
struct emac_instance *dev = param;
int slot = dev->rx_slot, received = 0;
+ struct device *dma_dev = &dev->ofdev->dev;
DBG2(dev, "poll_rx(%d)" NL, budget);
@@ -1763,11 +1768,11 @@ static int emac_poll_rx(void *param, int budget)
if (len && len < EMAC_RX_COPY_THRESH) {
struct sk_buff *copy_skb =
- alloc_skb(len + EMAC_RX_SKB_HEADROOM + 2, GFP_ATOMIC);
+ alloc_skb(len + EMAC_RX_SKB_HEADROOM(dma_dev) + 2, GFP_ATOMIC);
if (unlikely(!copy_skb))
goto oom;
- skb_reserve(copy_skb, EMAC_RX_SKB_HEADROOM + 2);
+ skb_reserve(copy_skb, EMAC_RX_SKB_HEADROOM(dma_dev) + 2);
memcpy(copy_skb->data - 2, skb->data - 2, len + 2);
emac_recycle_rx_skb(dev, slot, len);
skb = copy_skb;
@@ -2998,6 +3003,7 @@ static int emac_probe(struct platform_device *ofdev)
struct emac_instance *dev;
struct device_node *np = ofdev->dev.of_node;
struct device_node **blist = NULL;
+ struct device *dma_dev = &ofdev->dev;
int err, i;
/* Skip unused/unwired EMACS. We leave the check for an unused
@@ -3077,8 +3083,8 @@ static int emac_probe(struct platform_device *ofdev)
np, dev->mal_dev->dev.of_node);
goto err_rel_deps;
}
- dev->rx_skb_size = emac_rx_skb_size(ndev->mtu);
- dev->rx_sync_size = emac_rx_sync_size(ndev->mtu);
+ dev->rx_skb_size = emac_rx_skb_size(dma_dev, ndev->mtu);
+ dev->rx_sync_size = emac_rx_sync_size(dma_dev, ndev->mtu);
/* Get pointers to BD rings */
dev->tx_desc =
diff --git a/drivers/net/ethernet/ibm/emac/core.h b/drivers/net/ethernet/ibm/emac/core.h
index 369de2c..8107c32 100644
--- a/drivers/net/ethernet/ibm/emac/core.h
+++ b/drivers/net/ethernet/ibm/emac/core.h
@@ -68,22 +68,22 @@ static inline int emac_rx_size(int mtu)
return mal_rx_size(ETH_DATA_LEN + EMAC_MTU_OVERHEAD);
}
-#define EMAC_DMA_ALIGN(x) ALIGN((x), dma_get_cache_alignment())
+#define EMAC_DMA_ALIGN(d, x) ALIGN((x), dma_get_cache_alignment(d))
-#define EMAC_RX_SKB_HEADROOM \
- EMAC_DMA_ALIGN(CONFIG_IBM_EMAC_RX_SKB_HEADROOM)
+#define EMAC_RX_SKB_HEADROOM(d) \
+ EMAC_DMA_ALIGN(d, CONFIG_IBM_EMAC_RX_SKB_HEADROOM)
/* Size of RX skb for the given MTU */
-static inline int emac_rx_skb_size(int mtu)
+static inline int emac_rx_skb_size(struct device *dev, int mtu)
{
int size = max(mtu + EMAC_MTU_OVERHEAD, emac_rx_size(mtu));
- return EMAC_DMA_ALIGN(size + 2) + EMAC_RX_SKB_HEADROOM;
+ return EMAC_DMA_ALIGN(dev, size + 2) + EMAC_RX_SKB_HEADROOM;
}
/* RX DMA sync size */
-static inline int emac_rx_sync_size(int mtu)
+static inline int emac_rx_sync_size(struct device *dev, int mtu)
{
- return EMAC_DMA_ALIGN(emac_rx_size(mtu) + 2);
+ return EMAC_DMA_ALIGN(dev, emac_rx_size(mtu) + 2);
}
/* Driver statistcs is split into two parts to make it more cache friendly:
diff --git a/drivers/net/ethernet/mellanox/mlx4/main.c b/drivers/net/ethernet/mellanox/mlx4/main.c
index e61c99e..bc146dd 100644
--- a/drivers/net/ethernet/mellanox/mlx4/main.c
+++ b/drivers/net/ethernet/mellanox/mlx4/main.c
@@ -1660,7 +1660,7 @@ static int mlx4_init_icm(struct mlx4_dev *dev, struct mlx4_dev_cap *dev_cap,
*/
dev->caps.reserved_mtts =
ALIGN(dev->caps.reserved_mtts * dev->caps.mtt_entry_sz,
- dma_get_cache_alignment()) / dev->caps.mtt_entry_sz;
+ dma_get_cache_alignment(&dev->persist->pdev->dev)) / dev->caps.mtt_entry_sz;
err = mlx4_init_icm_table(dev, &priv->mr_table.mtt_table,
init_hca->mtt_base,
diff --git a/drivers/spi/spi-qup.c b/drivers/spi/spi-qup.c
index 974a8ce..e6da66e 100644
--- a/drivers/spi/spi-qup.c
+++ b/drivers/spi/spi-qup.c
@@ -862,7 +862,7 @@ static bool spi_qup_can_dma(struct spi_master *master, struct spi_device *spi,
struct spi_transfer *xfer)
{
struct spi_qup *qup = spi_master_get_devdata(master);
- size_t dma_align = dma_get_cache_alignment();
+ size_t dma_align = dma_get_cache_alignment(qup->dev);
int n_words;
if (xfer->rx_buf) {
@@ -1038,7 +1038,7 @@ static int spi_qup_probe(struct platform_device *pdev)
master->transfer_one = spi_qup_transfer_one;
master->dev.of_node = pdev->dev.of_node;
master->auto_runtime_pm = true;
- master->dma_alignment = dma_get_cache_alignment();
+ master->dma_alignment = dma_get_cache_alignment(dev);
master->max_dma_len = SPI_MAX_XFER;
platform_set_drvdata(pdev, master);
diff --git a/drivers/tty/serial/mpsc.c b/drivers/tty/serial/mpsc.c
index 67ffecc..8b5d0de 100644
--- a/drivers/tty/serial/mpsc.c
+++ b/drivers/tty/serial/mpsc.c
@@ -81,19 +81,19 @@
* Number of Tx & Rx descriptors must be powers of 2.
*/
#define MPSC_RXR_ENTRIES 32
-#define MPSC_RXRE_SIZE dma_get_cache_alignment()
-#define MPSC_RXR_SIZE (MPSC_RXR_ENTRIES * MPSC_RXRE_SIZE)
-#define MPSC_RXBE_SIZE dma_get_cache_alignment()
-#define MPSC_RXB_SIZE (MPSC_RXR_ENTRIES * MPSC_RXBE_SIZE)
+#define MPSC_RXRE_SIZE(d) dma_get_cache_alignment(d)
+#define MPSC_RXR_SIZE(d) (MPSC_RXR_ENTRIES * MPSC_RXRE_SIZE(d))
+#define MPSC_RXBE_SIZE(d) dma_get_cache_alignment(d)
+#define MPSC_RXB_SIZE(d) (MPSC_RXR_ENTRIES * MPSC_RXBE_SIZE(d))
#define MPSC_TXR_ENTRIES 32
-#define MPSC_TXRE_SIZE dma_get_cache_alignment()
-#define MPSC_TXR_SIZE (MPSC_TXR_ENTRIES * MPSC_TXRE_SIZE)
-#define MPSC_TXBE_SIZE dma_get_cache_alignment()
-#define MPSC_TXB_SIZE (MPSC_TXR_ENTRIES * MPSC_TXBE_SIZE)
+#define MPSC_TXRE_SIZE(d) dma_get_cache_alignment(d)
+#define MPSC_TXR_SIZE(d) (MPSC_TXR_ENTRIES * MPSC_TXRE_SIZE(d))
+#define MPSC_TXBE_SIZE(d) dma_get_cache_alignment(d)
+#define MPSC_TXB_SIZE(d) (MPSC_TXR_ENTRIES * MPSC_TXBE_SIZE(d))
-#define MPSC_DMA_ALLOC_SIZE (MPSC_RXR_SIZE + MPSC_RXB_SIZE + MPSC_TXR_SIZE \
- + MPSC_TXB_SIZE + dma_get_cache_alignment() /* for alignment */)
+#define MPSC_DMA_ALLOC_SIZE(d) (MPSC_RXR_SIZE(d) + MPSC_RXB_SIZE(d) + MPSC_TXR_SIZE(d) \
+ + MPSC_TXB_SIZE(d) + dma_get_cache_alignment(d) /* for alignment */)
/* Rx and Tx Ring entry descriptors -- assume entry size is <= cacheline size */
struct mpsc_rx_desc {
@@ -520,22 +520,23 @@ static uint mpsc_sdma_tx_active(struct mpsc_port_info *pi)
static void mpsc_sdma_start_tx(struct mpsc_port_info *pi)
{
struct mpsc_tx_desc *txre, *txre_p;
+ struct device *dma_dev = pi->port.dev;
/* If tx isn't running & there's a desc ready to go, start it */
if (!mpsc_sdma_tx_active(pi)) {
txre = (struct mpsc_tx_desc *)(pi->txr
- + (pi->txr_tail * MPSC_TXRE_SIZE));
- dma_cache_sync(pi->port.dev, (void *)txre, MPSC_TXRE_SIZE,
+ + (pi->txr_tail * MPSC_TXRE_SIZE(dma_dev)));
+ dma_cache_sync(pi->port.dev, (void *)txre, MPSC_TXRE_SIZE(dma_dev),
DMA_FROM_DEVICE);
#if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
invalidate_dcache_range((ulong)txre,
- (ulong)txre + MPSC_TXRE_SIZE);
+ (ulong)txre + MPSC_TXRE_SIZE(dma_dev));
#endif
if (be32_to_cpu(txre->cmdstat) & SDMA_DESC_CMDSTAT_O) {
txre_p = (struct mpsc_tx_desc *)
- (pi->txr_p + (pi->txr_tail * MPSC_TXRE_SIZE));
+ (pi->txr_p + (pi->txr_tail * MPSC_TXRE_SIZE(dma_dev)));
mpsc_sdma_set_tx_ring(pi, txre_p);
mpsc_sdma_cmd(pi, SDMA_SDCM_STD | SDMA_SDCM_TXD);
@@ -738,7 +739,7 @@ static void mpsc_init_hw(struct mpsc_port_info *pi)
mpsc_brg_init(pi, pi->brg_clk_src);
mpsc_brg_enable(pi);
- mpsc_sdma_init(pi, dma_get_cache_alignment()); /* burst a cacheline */
+ mpsc_sdma_init(pi, dma_get_cache_alignment(pi->port.dev)); /* burst a cacheline */
mpsc_sdma_stop(pi);
mpsc_hw_init(pi);
}
@@ -746,6 +747,7 @@ static void mpsc_init_hw(struct mpsc_port_info *pi)
static int mpsc_alloc_ring_mem(struct mpsc_port_info *pi)
{
int rc = 0;
+ struct device *dma_dev = pi->port.dev;
pr_debug("mpsc_alloc_ring_mem[%d]: Allocating ring mem\n",
pi->port.line);
@@ -755,7 +757,7 @@ static int mpsc_alloc_ring_mem(struct mpsc_port_info *pi)
printk(KERN_ERR "MPSC: Inadequate DMA support\n");
rc = -ENXIO;
} else if ((pi->dma_region = dma_alloc_attrs(pi->port.dev,
- MPSC_DMA_ALLOC_SIZE,
+ MPSC_DMA_ALLOC_SIZE(dma_dev),
&pi->dma_region_p, GFP_KERNEL,
DMA_ATTR_NON_CONSISTENT))
== NULL) {
@@ -769,10 +771,12 @@ static int mpsc_alloc_ring_mem(struct mpsc_port_info *pi)
static void mpsc_free_ring_mem(struct mpsc_port_info *pi)
{
+ struct device *dma_dev = pi->port.dev;
+
pr_debug("mpsc_free_ring_mem[%d]: Freeing ring mem\n", pi->port.line);
if (pi->dma_region) {
- dma_free_attrs(pi->port.dev, MPSC_DMA_ALLOC_SIZE,
+ dma_free_attrs(pi->port.dev, MPSC_DMA_ALLOC_SIZE(dma_dev),
pi->dma_region, pi->dma_region_p,
DMA_ATTR_NON_CONSISTENT);
pi->dma_region = NULL;
@@ -784,6 +788,7 @@ static void mpsc_init_rings(struct mpsc_port_info *pi)
{
struct mpsc_rx_desc *rxre;
struct mpsc_tx_desc *txre;
+ struct device *dma_dev = pi->port.dev;
dma_addr_t dp, dp_p;
u8 *bp, *bp_p;
int i;
@@ -792,14 +797,14 @@ static void mpsc_init_rings(struct mpsc_port_info *pi)
BUG_ON(pi->dma_region == NULL);
- memset(pi->dma_region, 0, MPSC_DMA_ALLOC_SIZE);
+ memset(pi->dma_region, 0, MPSC_DMA_ALLOC_SIZE(dma_dev));
/*
* Descriptors & buffers are multiples of cacheline size and must be
* cacheline aligned.
*/
- dp = ALIGN((u32)pi->dma_region, dma_get_cache_alignment());
- dp_p = ALIGN((u32)pi->dma_region_p, dma_get_cache_alignment());
+ dp = ALIGN((u32)pi->dma_region, dma_get_cache_alignment(dma_dev));
+ dp_p = ALIGN((u32)pi->dma_region_p, dma_get_cache_alignment(dma_dev));
/*
* Partition dma region into rx ring descriptor, rx buffers,
@@ -807,20 +812,20 @@ static void mpsc_init_rings(struct mpsc_port_info *pi)
*/
pi->rxr = dp;
pi->rxr_p = dp_p;
- dp += MPSC_RXR_SIZE;
- dp_p += MPSC_RXR_SIZE;
+ dp += MPSC_RXR_SIZE(dma_dev);
+ dp_p += MPSC_RXR_SIZE(dma_dev);
pi->rxb = (u8 *)dp;
pi->rxb_p = (u8 *)dp_p;
- dp += MPSC_RXB_SIZE;
- dp_p += MPSC_RXB_SIZE;
+ dp += MPSC_RXB_SIZE(dma_dev);
+ dp_p += MPSC_RXB_SIZE(dma_dev);
pi->rxr_posn = 0;
pi->txr = dp;
pi->txr_p = dp_p;
- dp += MPSC_TXR_SIZE;
- dp_p += MPSC_TXR_SIZE;
+ dp += MPSC_TXR_SIZE(dma_dev);
+ dp_p += MPSC_TXR_SIZE(dma_dev);
pi->txb = (u8 *)dp;
pi->txb_p = (u8 *)dp_p;
@@ -837,18 +842,18 @@ static void mpsc_init_rings(struct mpsc_port_info *pi)
for (i = 0; i < MPSC_RXR_ENTRIES; i++) {
rxre = (struct mpsc_rx_desc *)dp;
- rxre->bufsize = cpu_to_be16(MPSC_RXBE_SIZE);
+ rxre->bufsize = cpu_to_be16(MPSC_RXBE_SIZE(dma_dev));
rxre->bytecnt = cpu_to_be16(0);
rxre->cmdstat = cpu_to_be32(SDMA_DESC_CMDSTAT_O
| SDMA_DESC_CMDSTAT_EI | SDMA_DESC_CMDSTAT_F
| SDMA_DESC_CMDSTAT_L);
- rxre->link = cpu_to_be32(dp_p + MPSC_RXRE_SIZE);
+ rxre->link = cpu_to_be32(dp_p + MPSC_RXRE_SIZE(dma_dev));
rxre->buf_ptr = cpu_to_be32(bp_p);
- dp += MPSC_RXRE_SIZE;
- dp_p += MPSC_RXRE_SIZE;
- bp += MPSC_RXBE_SIZE;
- bp_p += MPSC_RXBE_SIZE;
+ dp += MPSC_RXRE_SIZE(dma_dev);
+ dp_p += MPSC_RXRE_SIZE(dma_dev);
+ bp += MPSC_RXBE_SIZE(dma_dev);
+ bp_p += MPSC_RXBE_SIZE(dma_dev);
}
rxre->link = cpu_to_be32(pi->rxr_p); /* Wrap last back to first */
@@ -861,23 +866,23 @@ static void mpsc_init_rings(struct mpsc_port_info *pi)
for (i = 0; i < MPSC_TXR_ENTRIES; i++) {
txre = (struct mpsc_tx_desc *)dp;
- txre->link = cpu_to_be32(dp_p + MPSC_TXRE_SIZE);
+ txre->link = cpu_to_be32(dp_p + MPSC_TXRE_SIZE(dma_dev));
txre->buf_ptr = cpu_to_be32(bp_p);
- dp += MPSC_TXRE_SIZE;
- dp_p += MPSC_TXRE_SIZE;
- bp += MPSC_TXBE_SIZE;
- bp_p += MPSC_TXBE_SIZE;
+ dp += MPSC_TXRE_SIZE(dma_dev);
+ dp_p += MPSC_TXRE_SIZE(dma_dev);
+ bp += MPSC_TXBE_SIZE(dma_dev);
+ bp_p += MPSC_TXBE_SIZE(dma_dev);
}
txre->link = cpu_to_be32(pi->txr_p); /* Wrap last back to first */
dma_cache_sync(pi->port.dev, (void *)pi->dma_region,
- MPSC_DMA_ALLOC_SIZE, DMA_BIDIRECTIONAL);
+ MPSC_DMA_ALLOC_SIZE(dma_dev), DMA_BIDIRECTIONAL);
#if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
flush_dcache_range((ulong)pi->dma_region,
(ulong)pi->dma_region
- + MPSC_DMA_ALLOC_SIZE);
+ + MPSC_DMA_ALLOC_SIZE(dma_dev));
#endif
return;
@@ -936,6 +941,7 @@ static int serial_polled;
static int mpsc_rx_intr(struct mpsc_port_info *pi, unsigned long *flags)
{
struct mpsc_rx_desc *rxre;
+ struct device *dma_dev = pi->port.dev;
struct tty_port *port = &pi->port.state->port;
u32 cmdstat, bytes_in, i;
int rc = 0;
@@ -944,14 +950,14 @@ static int mpsc_rx_intr(struct mpsc_port_info *pi, unsigned long *flags)
pr_debug("mpsc_rx_intr[%d]: Handling Rx intr\n", pi->port.line);
- rxre = (struct mpsc_rx_desc *)(pi->rxr + (pi->rxr_posn*MPSC_RXRE_SIZE));
+ rxre = (struct mpsc_rx_desc *)(pi->rxr + (pi->rxr_posn*MPSC_RXRE_SIZE(dma_dev)));
- dma_cache_sync(pi->port.dev, (void *)rxre, MPSC_RXRE_SIZE,
+ dma_cache_sync(pi->port.dev, (void *)rxre, MPSC_RXRE_SIZE(dma_dev),
DMA_FROM_DEVICE);
#if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
invalidate_dcache_range((ulong)rxre,
- (ulong)rxre + MPSC_RXRE_SIZE);
+ (ulong)rxre + MPSC_RXRE_SIZE(dma_dev));
#endif
/*
@@ -979,13 +985,13 @@ static int mpsc_rx_intr(struct mpsc_port_info *pi, unsigned long *flags)
*/
}
- bp = pi->rxb + (pi->rxr_posn * MPSC_RXBE_SIZE);
- dma_cache_sync(pi->port.dev, (void *)bp, MPSC_RXBE_SIZE,
+ bp = pi->rxb + (pi->rxr_posn * MPSC_RXBE_SIZE(dma_dev));
+ dma_cache_sync(pi->port.dev, (void *)bp, MPSC_RXBE_SIZE(dma_dev),
DMA_FROM_DEVICE);
#if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
invalidate_dcache_range((ulong)bp,
- (ulong)bp + MPSC_RXBE_SIZE);
+ (ulong)bp + MPSC_RXBE_SIZE(dma_dev));
#endif
/*
@@ -1056,24 +1062,24 @@ static int mpsc_rx_intr(struct mpsc_port_info *pi, unsigned long *flags)
| SDMA_DESC_CMDSTAT_EI | SDMA_DESC_CMDSTAT_F
| SDMA_DESC_CMDSTAT_L);
wmb();
- dma_cache_sync(pi->port.dev, (void *)rxre, MPSC_RXRE_SIZE,
+ dma_cache_sync(pi->port.dev, (void *)rxre, MPSC_RXRE_SIZE(dma_dev),
DMA_BIDIRECTIONAL);
#if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
flush_dcache_range((ulong)rxre,
- (ulong)rxre + MPSC_RXRE_SIZE);
+ (ulong)rxre + MPSC_RXRE_SIZE(dma_dev));
#endif
/* Advance to next descriptor */
pi->rxr_posn = (pi->rxr_posn + 1) & (MPSC_RXR_ENTRIES - 1);
rxre = (struct mpsc_rx_desc *)
- (pi->rxr + (pi->rxr_posn * MPSC_RXRE_SIZE));
- dma_cache_sync(pi->port.dev, (void *)rxre, MPSC_RXRE_SIZE,
+ (pi->rxr + (pi->rxr_posn * MPSC_RXRE_SIZE(dma_dev)));
+ dma_cache_sync(pi->port.dev, (void *)rxre, MPSC_RXRE_SIZE(dma_dev),
DMA_FROM_DEVICE);
#if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
invalidate_dcache_range((ulong)rxre,
- (ulong)rxre + MPSC_RXRE_SIZE);
+ (ulong)rxre + MPSC_RXRE_SIZE(dma_dev));
#endif
rc = 1;
}
@@ -1091,9 +1097,10 @@ static int mpsc_rx_intr(struct mpsc_port_info *pi, unsigned long *flags)
static void mpsc_setup_tx_desc(struct mpsc_port_info *pi, u32 count, u32 intr)
{
struct mpsc_tx_desc *txre;
+ struct device *dma_dev = pi->port.dev;
txre = (struct mpsc_tx_desc *)(pi->txr
- + (pi->txr_head * MPSC_TXRE_SIZE));
+ + (pi->txr_head * MPSC_TXRE_SIZE(dma_dev)));
txre->bytecnt = cpu_to_be16(count);
txre->shadow = txre->bytecnt;
@@ -1102,17 +1109,18 @@ static void mpsc_setup_tx_desc(struct mpsc_port_info *pi, u32 count, u32 intr)
| SDMA_DESC_CMDSTAT_L
| ((intr) ? SDMA_DESC_CMDSTAT_EI : 0));
wmb();
- dma_cache_sync(pi->port.dev, (void *)txre, MPSC_TXRE_SIZE,
+ dma_cache_sync(pi->port.dev, (void *)txre, MPSC_TXRE_SIZE(dma_dev),
DMA_BIDIRECTIONAL);
#if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
flush_dcache_range((ulong)txre,
- (ulong)txre + MPSC_TXRE_SIZE);
+ (ulong)txre + MPSC_TXRE_SIZE(dma_dev));
#endif
}
static void mpsc_copy_tx_data(struct mpsc_port_info *pi)
{
+ struct device *dma_dev = pi->port.dev;
struct circ_buf *xmit = &pi->port.state->xmit;
u8 *bp;
u32 i;
@@ -1129,17 +1137,17 @@ static void mpsc_copy_tx_data(struct mpsc_port_info *pi)
* CHR_1. Instead, just put it in-band with
* all the other Tx data.
*/
- bp = pi->txb + (pi->txr_head * MPSC_TXBE_SIZE);
+ bp = pi->txb + (pi->txr_head * MPSC_TXBE_SIZE(dma_dev));
*bp = pi->port.x_char;
pi->port.x_char = 0;
i = 1;
} else if (!uart_circ_empty(xmit)
&& !uart_tx_stopped(&pi->port)) {
- i = min((u32)MPSC_TXBE_SIZE,
+ i = min((u32)MPSC_TXBE_SIZE(dma_dev),
(u32)uart_circ_chars_pending(xmit));
i = min(i, (u32)CIRC_CNT_TO_END(xmit->head, xmit->tail,
UART_XMIT_SIZE));
- bp = pi->txb + (pi->txr_head * MPSC_TXBE_SIZE);
+ bp = pi->txb + (pi->txr_head * MPSC_TXBE_SIZE(dma_dev));
memcpy(bp, &xmit->buf[xmit->tail], i);
xmit->tail = (xmit->tail + i) & (UART_XMIT_SIZE - 1);
@@ -1149,12 +1157,12 @@ static void mpsc_copy_tx_data(struct mpsc_port_info *pi)
return;
}
- dma_cache_sync(pi->port.dev, (void *)bp, MPSC_TXBE_SIZE,
+ dma_cache_sync(pi->port.dev, (void *)bp, MPSC_TXBE_SIZE(dma_dev),
DMA_BIDIRECTIONAL);
#if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
flush_dcache_range((ulong)bp,
- (ulong)bp + MPSC_TXBE_SIZE);
+ (ulong)bp + MPSC_TXBE_SIZE(dma_dev));
#endif
mpsc_setup_tx_desc(pi, i, 1);
@@ -1166,6 +1174,7 @@ static void mpsc_copy_tx_data(struct mpsc_port_info *pi)
static int mpsc_tx_intr(struct mpsc_port_info *pi)
{
struct mpsc_tx_desc *txre;
+ struct device *dma_dev = pi->port.dev;
int rc = 0;
unsigned long iflags;
@@ -1173,14 +1182,14 @@ static int mpsc_tx_intr(struct mpsc_port_info *pi)
if (!mpsc_sdma_tx_active(pi)) {
txre = (struct mpsc_tx_desc *)(pi->txr
- + (pi->txr_tail * MPSC_TXRE_SIZE));
+ + (pi->txr_tail * MPSC_TXRE_SIZE(dma_dev)));
- dma_cache_sync(pi->port.dev, (void *)txre, MPSC_TXRE_SIZE,
+ dma_cache_sync(pi->port.dev, (void *)txre, MPSC_TXRE_SIZE(dma_dev),
DMA_FROM_DEVICE);
#if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
invalidate_dcache_range((ulong)txre,
- (ulong)txre + MPSC_TXRE_SIZE);
+ (ulong)txre + MPSC_TXRE_SIZE(dma_dev));
#endif
while (!(be32_to_cpu(txre->cmdstat) & SDMA_DESC_CMDSTAT_O)) {
@@ -1193,13 +1202,13 @@ static int mpsc_tx_intr(struct mpsc_port_info *pi)
break;
txre = (struct mpsc_tx_desc *)(pi->txr
- + (pi->txr_tail * MPSC_TXRE_SIZE));
+ + (pi->txr_tail * MPSC_TXRE_SIZE(dma_dev)));
dma_cache_sync(pi->port.dev, (void *)txre,
- MPSC_TXRE_SIZE, DMA_FROM_DEVICE);
+ MPSC_TXRE_SIZE(dma_dev), DMA_FROM_DEVICE);
#if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
invalidate_dcache_range((ulong)txre,
- (ulong)txre + MPSC_TXRE_SIZE);
+ (ulong)txre + MPSC_TXRE_SIZE(dma_dev));
#endif
}
@@ -1360,6 +1369,7 @@ static int mpsc_startup(struct uart_port *port)
{
struct mpsc_port_info *pi =
container_of(port, struct mpsc_port_info, port);
+ struct device *dma_dev = pi->port.dev;
u32 flag = 0;
int rc;
@@ -1381,7 +1391,7 @@ static int mpsc_startup(struct uart_port *port)
mpsc_sdma_intr_unmask(pi, 0xf);
mpsc_sdma_set_rx_ring(pi, (struct mpsc_rx_desc *)(pi->rxr_p
- + (pi->rxr_posn * MPSC_RXRE_SIZE)));
+ + (pi->rxr_posn * MPSC_RXRE_SIZE(dma_dev))));
}
return rc;
@@ -1555,9 +1565,10 @@ static void mpsc_put_poll_char(struct uart_port *port,
static int mpsc_get_poll_char(struct uart_port *port)
{
+ struct mpsc_rx_desc *rxre;
struct mpsc_port_info *pi =
container_of(port, struct mpsc_port_info, port);
- struct mpsc_rx_desc *rxre;
+ struct device *dma_dev = pi->port.dev;
u32 cmdstat, bytes_in, i;
u8 *bp;
@@ -1575,13 +1586,13 @@ static int mpsc_get_poll_char(struct uart_port *port)
while (poll_cnt == 0) {
rxre = (struct mpsc_rx_desc *)(pi->rxr +
- (pi->rxr_posn*MPSC_RXRE_SIZE));
+ (pi->rxr_posn*MPSC_RXRE_SIZE(dma_dev)));
dma_cache_sync(pi->port.dev, (void *)rxre,
- MPSC_RXRE_SIZE, DMA_FROM_DEVICE);
+ MPSC_RXRE_SIZE(dma_dev), DMA_FROM_DEVICE);
#if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
invalidate_dcache_range((ulong)rxre,
- (ulong)rxre + MPSC_RXRE_SIZE);
+ (ulong)rxre + MPSC_RXRE_SIZE(dma_dev));
#endif
/*
* Loop through Rx descriptors handling ones that have
@@ -1591,13 +1602,13 @@ static int mpsc_get_poll_char(struct uart_port *port)
!((cmdstat = be32_to_cpu(rxre->cmdstat)) &
SDMA_DESC_CMDSTAT_O)){
bytes_in = be16_to_cpu(rxre->bytecnt);
- bp = pi->rxb + (pi->rxr_posn * MPSC_RXBE_SIZE);
+ bp = pi->rxb + (pi->rxr_posn * MPSC_RXBE_SIZE(dma_dev));
dma_cache_sync(pi->port.dev, (void *) bp,
- MPSC_RXBE_SIZE, DMA_FROM_DEVICE);
+ MPSC_RXBE_SIZE(dma_dev), DMA_FROM_DEVICE);
#if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
invalidate_dcache_range((ulong)bp,
- (ulong)bp + MPSC_RXBE_SIZE);
+ (ulong)bp + MPSC_RXBE_SIZE(dma_dev));
#endif
if ((unlikely(cmdstat & (SDMA_DESC_CMDSTAT_BR |
SDMA_DESC_CMDSTAT_FR | SDMA_DESC_CMDSTAT_OR))) &&
@@ -1619,24 +1630,24 @@ static int mpsc_get_poll_char(struct uart_port *port)
SDMA_DESC_CMDSTAT_L);
wmb();
dma_cache_sync(pi->port.dev, (void *)rxre,
- MPSC_RXRE_SIZE, DMA_BIDIRECTIONAL);
+ MPSC_RXRE_SIZE(dma_dev), DMA_BIDIRECTIONAL);
#if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
flush_dcache_range((ulong)rxre,
- (ulong)rxre + MPSC_RXRE_SIZE);
+ (ulong)rxre + MPSC_RXRE_SIZE(dma_dev));
#endif
/* Advance to next descriptor */
pi->rxr_posn = (pi->rxr_posn + 1) &
(MPSC_RXR_ENTRIES - 1);
rxre = (struct mpsc_rx_desc *)(pi->rxr +
- (pi->rxr_posn * MPSC_RXRE_SIZE));
+ (pi->rxr_posn * MPSC_RXRE_SIZE(dma_dev)));
dma_cache_sync(pi->port.dev, (void *)rxre,
- MPSC_RXRE_SIZE, DMA_FROM_DEVICE);
+ MPSC_RXRE_SIZE(dma_dev), DMA_FROM_DEVICE);
#if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
invalidate_dcache_range((ulong)rxre,
- (ulong)rxre + MPSC_RXRE_SIZE);
+ (ulong)rxre + MPSC_RXRE_SIZE(dma_dev));
#endif
}
@@ -1706,6 +1717,7 @@ static const struct uart_ops mpsc_pops = {
static void mpsc_console_write(struct console *co, const char *s, uint count)
{
struct mpsc_port_info *pi = &mpsc_ports[co->index];
+ struct device *dma_dev = pi->port.dev;
u8 *bp, *dp, add_cr = 0;
int i;
unsigned long iflags;
@@ -1723,9 +1735,9 @@ static void mpsc_console_write(struct console *co, const char *s, uint count)
udelay(100);
while (count > 0) {
- bp = dp = pi->txb + (pi->txr_head * MPSC_TXBE_SIZE);
+ bp = dp = pi->txb + (pi->txr_head * MPSC_TXBE_SIZE(dma_dev));
- for (i = 0; i < MPSC_TXBE_SIZE; i++) {
+ for (i = 0; i < MPSC_TXBE_SIZE(dma_dev); i++) {
if (count == 0)
break;
@@ -1744,12 +1756,12 @@ static void mpsc_console_write(struct console *co, const char *s, uint count)
count--;
}
- dma_cache_sync(pi->port.dev, (void *)bp, MPSC_TXBE_SIZE,
+ dma_cache_sync(pi->port.dev, (void *)bp, MPSC_TXBE_SIZE(dma_dev),
DMA_BIDIRECTIONAL);
#if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
flush_dcache_range((ulong)bp,
- (ulong)bp + MPSC_TXBE_SIZE);
+ (ulong)bp + MPSC_TXBE_SIZE(dma_dev));
#endif
mpsc_setup_tx_desc(pi, i, 0);
pi->txr_head = (pi->txr_head + 1) & (MPSC_TXR_ENTRIES - 1);
@@ -2024,7 +2036,8 @@ static void mpsc_drv_unmap_regs(struct mpsc_port_info *pi)
static void mpsc_drv_get_platform_data(struct mpsc_port_info *pi,
struct platform_device *pd, int num)
{
- struct mpsc_pdata *pdata;
+ struct mpsc_pdata *pdata;
+ struct device *dma_dev = pi->port.dev;
pdata = dev_get_platdata(&pd->dev);
@@ -2032,7 +2045,7 @@ static void mpsc_drv_get_platform_data(struct mpsc_port_info *pi,
pi->port.iotype = UPIO_MEM;
pi->port.line = num;
pi->port.type = PORT_MPSC;
- pi->port.fifosize = MPSC_TXBE_SIZE;
+ pi->port.fifosize = MPSC_TXBE_SIZE(dma_dev);
pi->port.membase = pi->mpsc_base;
pi->port.mapbase = (ulong)pi->mpsc_base;
pi->port.ops = &mpsc_pops;
diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c
index 8aca18c..9df918e5 100644
--- a/drivers/tty/serial/samsung.c
+++ b/drivers/tty/serial/samsung.c
@@ -241,7 +241,7 @@ static void enable_tx_dma(struct s3c24xx_uart_port *ourport)
/* Enable tx dma mode */
ucon = rd_regl(port, S3C2410_UCON);
ucon &= ~(S3C64XX_UCON_TXBURST_MASK | S3C64XX_UCON_TXMODE_MASK);
- ucon |= (dma_get_cache_alignment() >= 16) ?
+ ucon |= (dma_get_cache_alignment(port->dev) >= 16) ?
S3C64XX_UCON_TXBURST_16 : S3C64XX_UCON_TXBURST_1;
ucon |= S3C64XX_UCON_TXMODE_DMA;
wr_regl(port, S3C2410_UCON, ucon);
@@ -292,7 +292,7 @@ static int s3c24xx_serial_start_tx_dma(struct s3c24xx_uart_port *ourport,
if (ourport->tx_mode != S3C24XX_TX_DMA)
enable_tx_dma(ourport);
- dma->tx_size = count & ~(dma_get_cache_alignment() - 1);
+ dma->tx_size = count & ~(dma_get_cache_alignment(port->dev) - 1);
dma->tx_transfer_addr = dma->tx_addr + xmit->tail;
dma_sync_single_for_device(ourport->port.dev, dma->tx_transfer_addr,
@@ -332,7 +332,7 @@ static void s3c24xx_serial_start_next_tx(struct s3c24xx_uart_port *ourport)
if (!ourport->dma || !ourport->dma->tx_chan ||
count < ourport->min_dma_size ||
- xmit->tail & (dma_get_cache_alignment() - 1))
+ xmit->tail & (dma_get_cache_alignment(port->dev) - 1))
s3c24xx_serial_start_tx_pio(ourport);
else
s3c24xx_serial_start_tx_dma(ourport, count);
@@ -718,8 +718,8 @@ static irqreturn_t s3c24xx_serial_tx_chars(int irq, void *id)
if (ourport->dma && ourport->dma->tx_chan &&
count >= ourport->min_dma_size) {
- int align = dma_get_cache_alignment() -
- (xmit->tail & (dma_get_cache_alignment() - 1));
+ int align = dma_get_cache_alignment(port->dev) -
+ (xmit->tail & (dma_get_cache_alignment(port->dev) - 1));
if (count-align >= ourport->min_dma_size) {
dma_count = count-align;
count = align;
@@ -870,7 +870,7 @@ static int s3c24xx_serial_request_dma(struct s3c24xx_uart_port *p)
dma->tx_conf.direction = DMA_MEM_TO_DEV;
dma->tx_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
dma->tx_conf.dst_addr = p->port.mapbase + S3C2410_UTXH;
- if (dma_get_cache_alignment() >= 16)
+ if (dma_get_cache_alignment(p->port.dev) >= 16)
dma->tx_conf.dst_maxburst = 16;
else
dma->tx_conf.dst_maxburst = 1;
@@ -1849,7 +1849,7 @@ static int s3c24xx_serial_probe(struct platform_device *pdev)
* so find minimal transfer size suitable for DMA mode
*/
ourport->min_dma_size = max_t(int, ourport->port.fifosize,
- dma_get_cache_alignment());
+ dma_get_cache_alignment(ourport->port.dev));
dbg("%s: initialising port %p...\n", __func__, ourport);
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index 29ce981..1326023 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -131,6 +131,7 @@ struct dma_map_ops {
#ifdef ARCH_HAS_DMA_GET_REQUIRED_MASK
u64 (*get_required_mask)(struct device *dev);
#endif
+ int (*get_cache_alignment)(struct device *dev);
int is_phys;
};
@@ -697,12 +698,18 @@ static inline void *dma_zalloc_coherent(struct device *dev, size_t size,
}
#ifdef CONFIG_HAS_DMA
-static inline int dma_get_cache_alignment(void)
-{
-#ifdef ARCH_DMA_MINALIGN
- return ARCH_DMA_MINALIGN;
+
+#ifndef ARCH_DMA_MINALIGN
+#define ARCH_DMA_MINALIGN 1
#endif
- return 1;
+
+static inline int dma_get_cache_alignment(struct device *dev)
+{
+ const struct dma_map_ops *ops = get_dma_ops(dev);
+ if (dev && ops && ops->get_cache_alignment)
+ return ops->get_cache_alignment(dev);
+
+ return ARCH_DMA_MINALIGN; /* compatible behavior */
}
#endif

Best regards
--
Marek Szyprowski, PhD
Samsung R&D Institute Poland