[U-Boot] [u-boot 30/40] dwc3: flush the buffers before using it

[Kishon Vijay Abraham I]

In the linux kernel, non cacheable buffers are used. However in uboot
since there are no APIs to allocate non cacheable memory, all
the buffers should be flushed before using it.

Signed-off-by: Kishon Vijay Abraham I <kishon at ti.com>
---
 drivers/usb/dwc3/core.c   |    7 +++++++
 drivers/usb/dwc3/ep0.c    |    6 ++++++
 drivers/usb/dwc3/gadget.c |    5 +++++
 drivers/usb/dwc3/io.h     |    6 ++++++
 4 files changed, 24 insertions(+)

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 5a8d5ea..4c3637f 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -769,11 +769,18 @@ void dwc3_uboot_exit(int index)
 void dwc3_uboot_handle_interrupt(int index)
 {
 	struct dwc3 *dwc = NULL;
+	int i;
+	struct dwc3_event_buffer *evt;
 
 	list_for_each_entry(dwc, &dwc3_list, list) {
 		if (dwc->index != index)
 			continue;
 
+		for (i = 0; i < dwc->num_event_buffers; i++) {
+			evt = dwc->ev_buffs[i];
+			dwc3_flush_cache((int)evt->buf, evt->length);
+		}
+
 		dwc3_gadget_uboot_handle_interrupt(dwc);
 		break;
 	}
diff --git a/drivers/usb/dwc3/ep0.c b/drivers/usb/dwc3/ep0.c
index 803ba51..977d6d4 100644
--- a/drivers/usb/dwc3/ep0.c
+++ b/drivers/usb/dwc3/ep0.c
@@ -74,6 +74,9 @@ static int dwc3_ep0_start_trans(struct dwc3 *dwc, u8 epnum, dma_addr_t buf_dma,
 			| DWC3_TRB_CTRL_IOC
 			| DWC3_TRB_CTRL_ISP_IMI);
 
+	dwc3_flush_cache((int)buf_dma, len);
+	dwc3_flush_cache((int)trb, sizeof(*trb));
+
 	memset(&params, 0, sizeof(params));
 	params.param0 = upper_32_bits(dwc->ep0_trb_addr);
 	params.param1 = lower_32_bits(dwc->ep0_trb_addr);
@@ -774,6 +777,8 @@ static void dwc3_ep0_complete_data(struct dwc3 *dwc,
 	if (!r)
 		return;
 
+	dwc3_flush_cache((int)trb, sizeof(*trb));
+
 	status = DWC3_TRB_SIZE_TRBSTS(trb->size);
 	if (status == DWC3_TRBSTS_SETUP_PENDING) {
 		dev_dbg(dwc->dev, "Setup Pending received");
@@ -795,6 +800,7 @@ static void dwc3_ep0_complete_data(struct dwc3 *dwc,
 		transfer_size += (maxp - (transfer_size % maxp));
 		transferred = min_t(u32, ur->length,
 				transfer_size - length);
+		dwc3_flush_cache((int)dwc->ep0_bounce, DWC3_EP0_BOUNCE_SIZE);
 		memcpy(ur->buf, dwc->ep0_bounce, transferred);
 	} else {
 		transferred = ur->length - length;
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 1f97729..b68b6a4 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -244,6 +244,7 @@ void dwc3_gadget_giveback(struct dwc3_ep *dep, struct dwc3_request *req,
 
 	list_del(&req->list);
 	req->trb = NULL;
+	dwc3_flush_cache((int)req->request.dma, req->request.length);
 
 	if (req->request.status == -EINPROGRESS)
 		req->request.status = status;
@@ -769,6 +770,9 @@ static void dwc3_prepare_one_trb(struct dwc3_ep *dep,
 		trb->ctrl |= DWC3_TRB_CTRL_SID_SOFN(req->request.stream_id);
 
 	trb->ctrl |= DWC3_TRB_CTRL_HWO;
+
+	dwc3_flush_cache((int)dma, length);
+	dwc3_flush_cache((int)trb, sizeof(*trb));
 }
 
 /*
@@ -1770,6 +1774,7 @@ static int dwc3_cleanup_done_reqs(struct dwc3 *dwc, struct dwc3_ep *dep,
 		slot %= DWC3_TRB_NUM;
 		trb = &dep->trb_pool[slot];
 
+		dwc3_flush_cache((int)trb, sizeof(*trb));
 		ret = __dwc3_cleanup_done_trbs(dwc, dep, req, trb,
 				event, status);
 		if (ret)
diff --git a/drivers/usb/dwc3/io.h b/drivers/usb/dwc3/io.h
index b6da135..31606de 100644
--- a/drivers/usb/dwc3/io.h
+++ b/drivers/usb/dwc3/io.h
@@ -20,6 +20,7 @@
 
 #include <asm/io.h>
 
+#define	CACHELINE_SIZE		CONFIG_SYS_CACHELINE_SIZE
 static inline u32 dwc3_readl(void __iomem *base, u32 offset)
 {
 	u32 offs = offset - DWC3_GLOBALS_REGS_START;
@@ -47,4 +48,9 @@ static inline void dwc3_writel(void __iomem *base, u32 offset, u32 value)
 	writel(value, base + offs);
 }
 
+static inline void dwc3_flush_cache(int addr, int length)
+{
+	flush_dcache_range(addr & ~(CACHELINE_SIZE - 1),
+			   ALIGN(addr + length, CACHELINE_SIZE));
+}
 #endif /* __DRIVERS_USB_DWC3_IO_H */
-- 
1.7.9.5