linux-kernel - [PATCH 06/11] usb: dwc2/gadget: ensure that all fifos have correct memory buffers

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Message-id: <1403509890-14103-7-git-send-email-r.baldyga@samsung.com>
Date:	Mon, 23 Jun 2014 09:51:25 +0200
From:	Robert Baldyga <r.baldyga@...sung.com>
To:	balbi@...com
Cc:	paulz@...opsys.com, gregkh@...uxfoundation.org,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	m.szyprowski@...sung.com, andrzej.p@...sung.com,
	Robert Baldyga <r.baldyga@...sung.com>
Subject: [PATCH 06/11] usb: dwc2/gadget: ensure that all fifos have correct
 memory buffers

From: Marek Szyprowski <m.szyprowski@...sung.com>

Print warning if FIFOs are configured in such a way that they don't fit
into the SPRAM available on the s3c hsotg module.

Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
Signed-off-by: Robert Baldyga <r.baldyga@...sung.com>
---
 drivers/usb/dwc2/core.h   |  1 +
 drivers/usb/dwc2/gadget.c | 15 ++++++++++-----
 2 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/drivers/usb/dwc2/core.h b/drivers/usb/dwc2/core.h
index 1efd10c..067390e 100644
--- a/drivers/usb/dwc2/core.h
+++ b/drivers/usb/dwc2/core.h
@@ -194,6 +194,7 @@ struct s3c_hsotg {
 	struct regulator_bulk_data supplies[ARRAY_SIZE(s3c_hsotg_supply_names)];
 
 	u32                     phyif;
+	int			fifo_mem;
 	unsigned int            dedicated_fifos:1;
 	unsigned char           num_of_eps;
 
diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c
index 95b6dcb..21d21de 100644
--- a/drivers/usb/dwc2/gadget.c
+++ b/drivers/usb/dwc2/gadget.c
@@ -194,6 +194,8 @@ static void s3c_hsotg_init_fifo(struct s3c_hsotg *hsotg)
 	for (ep = 1; ep <= 15; ep++) {
 		val = addr;
 		val |= size << FIFOSIZE_DEPTH_SHIFT;
+		WARN_ONCE(addr + size > hsotg->fifo_mem,
+			  "insufficient fifo memory");
 		addr += size;
 
 		writel(val, hsotg->regs + DPTXFSIZN(ep));
@@ -3030,19 +3032,22 @@ static void s3c_hsotg_initep(struct s3c_hsotg *hsotg,
  */
 static void s3c_hsotg_hw_cfg(struct s3c_hsotg *hsotg)
 {
-	u32 cfg2, cfg4;
+	u32 cfg2, cfg3, cfg4;
 	/* check hardware configuration */
 
 	cfg2 = readl(hsotg->regs + 0x48);
 	hsotg->num_of_eps = (cfg2 >> 10) & 0xF;
 
-	dev_info(hsotg->dev, "EPs:%d\n", hsotg->num_of_eps);
+	cfg3 = readl(hsotg->regs + 0x4C);
+	hsotg->fifo_mem = (cfg3 >> 16);
 
 	cfg4 = readl(hsotg->regs + 0x50);
 	hsotg->dedicated_fifos = (cfg4 >> 25) & 1;
 
-	dev_info(hsotg->dev, "%s fifos\n",
-		 hsotg->dedicated_fifos ? "dedicated" : "shared");
+	dev_info(hsotg->dev, "EPs: %d, %s fifos, %d entries in SPRAM\n",
+		 hsotg->num_of_eps,
+		 hsotg->dedicated_fifos ? "dedicated" : "shared",
+		 hsotg->fifo_mem);
 }
 
 /**
@@ -3495,8 +3500,8 @@ static int s3c_hsotg_probe(struct platform_device *pdev)
 	s3c_hsotg_phy_enable(hsotg);
 
 	s3c_hsotg_corereset(hsotg);
-	s3c_hsotg_init(hsotg);
 	s3c_hsotg_hw_cfg(hsotg);
+	s3c_hsotg_init(hsotg);
 
 	/* hsotg->num_of_eps holds number of EPs other than ep0 */
 
-- 
1.9.1

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