Commit db402e00 authored by Alexander Stein's avatar Alexander Stein Committed by Tom Rini
Browse files

dwc2: Add dcache support

This adds dcache support for dwc2. The DMA buffers must be DMA aligned and
is flushed for outgoing transactions before starting transfer. For
ingoing transactions it is invalidated after the transfer has finished.
Signed-off-by: default avatarAlexander Stein <>
Acked-by: default avatarStephen Warren <>
[trini: Update to apply again on top of DM patches]
Signed-off-by: default avatarTom Rini <>
parent 4342557f
......@@ -27,8 +27,8 @@
struct dwc2_priv {
uint8_t aligned_buffer[DWC2_DATA_BUF_SIZE] __aligned(8);
uint8_t status_buffer[DWC2_STATUS_BUF_SIZE] __aligned(8);
uint8_t aligned_buffer[DWC2_DATA_BUF_SIZE] __aligned(ARCH_DMA_MINALIGN);
uint8_t status_buffer[DWC2_STATUS_BUF_SIZE] __aligned(ARCH_DMA_MINALIGN);
uint8_t *aligned_buffer;
uint8_t *status_buffer;
......@@ -39,9 +39,11 @@ struct dwc2_priv {
/* We need doubleword-aligned buffers for DMA transfers */
DEFINE_ALIGN_BUFFER(uint8_t, aligned_buffer_addr, DWC2_DATA_BUF_SIZE, 8);
DEFINE_ALIGN_BUFFER(uint8_t, status_buffer_addr, DWC2_STATUS_BUF_SIZE, 8);
/* We need cacheline-aligned buffers for DMA transfers and dcache support */
DEFINE_ALIGN_BUFFER(uint8_t, aligned_buffer_addr, DWC2_DATA_BUF_SIZE,
DEFINE_ALIGN_BUFFER(uint8_t, status_buffer_addr, DWC2_STATUS_BUF_SIZE,
static struct dwc2_priv local;
......@@ -821,8 +823,11 @@ int chunk_msg(struct dwc2_priv *priv, struct usb_device *dev,
if (!in) {
memcpy(priv->aligned_buffer, (char *)buffer + done,
memcpy(priv->aligned_buffer, (char *)buffer + done, len);
flush_dcache_range((unsigned long)priv->aligned_buffer,
(unsigned long)((void *)priv->aligned_buffer +
roundup(len, ARCH_DMA_MINALIGN)));
writel(phys_to_bus((unsigned long)priv->aligned_buffer),
......@@ -840,6 +845,11 @@ int chunk_msg(struct dwc2_priv *priv, struct usb_device *dev,
if (in) {
xfer_len -= sub;
invalidate_dcache_range((unsigned long)priv->aligned_buffer,
(unsigned long)((void *)priv->aligned_buffer +
roundup(xfer_len, ARCH_DMA_MINALIGN)));
memcpy(buffer + done, priv->aligned_buffer, xfer_len);
if (sub)
stop_transfer = 1;
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