From 1064cd928abf0b77e9fa2edae9f260924b434537 Mon Sep 17 00:00:00 2001 From: Alexander Stein Date: Fri, 24 Jul 2015 09:22:14 +0200 Subject: [PATCH] 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: Alexander Stein Acked-by: Stephen Warren [trini: Update to apply again on top of DM patches] Signed-off-by: Tom Rini --- drivers/usb/host/dwc2.c | 24 +++++++++++++++++------- 1 file changed, 17 insertions(+), 7 deletions(-) diff --git a/drivers/usb/host/dwc2.c b/drivers/usb/host/dwc2.c index 702ef63f87..09f91f190a 100644 --- a/drivers/usb/host/dwc2.c +++ b/drivers/usb/host/dwc2.c @@ -27,8 +27,8 @@ struct dwc2_priv { #ifdef CONFIG_DM_USB - 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); #else uint8_t *aligned_buffer; uint8_t *status_buffer; @@ -39,9 +39,11 @@ struct dwc2_priv { }; #ifndef CONFIG_DM_USB -/* 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, + ARCH_DMA_MINALIGN); +DEFINE_ALIGN_BUFFER(uint8_t, status_buffer_addr, DWC2_STATUS_BUF_SIZE, + ARCH_DMA_MINALIGN); static struct dwc2_priv local; #endif @@ -821,8 +823,11 @@ int chunk_msg(struct dwc2_priv *priv, struct usb_device *dev, &hc_regs->hctsiz); if (!in) { - memcpy(priv->aligned_buffer, (char *)buffer + done, - len); + 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; -- 2.39.2