Patchwork [U-Boot,v4,1/2] usb: ehci: exynos: Fix multiple FDT decode

login
register
mail settings
Submitter Vivek Gautam
Date March 6, 2013, 8:48 a.m.
Message ID <1362559713-6743-2-git-send-email-gautam.vivek@samsung.com>
Download mbox | patch
Permalink /patch/225453/
State Accepted
Delegated to: Minkyu Kang
Headers show

Comments

Vivek Gautam - March 6, 2013, 8:48 a.m.
With current FDT support driver tries to parse device node
twice in ehci_hcd_init() and ehci_hcd_stop(), which shouldn't
happen ideally.
Making provision to store data in a global structure and thereby
passing its pointer when needed.

Signed-off-by: Vivek Gautam <gautam.vivek@samsung.com>
---

Changes from v3:
 - Checking for error return in exynos_usb_parse_dt() and returning
   there only in case of failure for DT systems.
 - Removed unnecesassry parentheses.

Changes from v2:
 - Using hcd as "struct ehci_hccr *" rather than "unsigned int" to
   avoid unnecessary typecasting later in the code.
 - Further using local variable of type "fdt_addr_t" in
   exynos_usb_parse_dt() and modifying the code as required.

Changes from v1:
 - Added patch to fix problem of multiple FDT decode.

 drivers/usb/host/ehci-exynos.c |   44 ++++++++++++++-------------------------
 1 files changed, 16 insertions(+), 28 deletions(-)
Simon Glass - March 7, 2013, 1:49 p.m.
On Wed, Mar 6, 2013 at 12:48 AM, Vivek Gautam <gautam.vivek@samsung.com> wrote:
> With current FDT support driver tries to parse device node
> twice in ehci_hcd_init() and ehci_hcd_stop(), which shouldn't
> happen ideally.
> Making provision to store data in a global structure and thereby
> passing its pointer when needed.
>
> Signed-off-by: Vivek Gautam <gautam.vivek@samsung.com>

Acked-by: Simon Glass <sjg@chromium.org>

> ---
>
> Changes from v3:
>  - Checking for error return in exynos_usb_parse_dt() and returning
>    there only in case of failure for DT systems.
>  - Removed unnecesassry parentheses.
>
> Changes from v2:
>  - Using hcd as "struct ehci_hccr *" rather than "unsigned int" to
>    avoid unnecessary typecasting later in the code.
>  - Further using local variable of type "fdt_addr_t" in
>    exynos_usb_parse_dt() and modifying the code as required.
>
> Changes from v1:
>  - Added patch to fix problem of multiple FDT decode.
>
>  drivers/usb/host/ehci-exynos.c |   44 ++++++++++++++-------------------------
>  1 files changed, 16 insertions(+), 28 deletions(-)
>

Patch

diff --git a/drivers/usb/host/ehci-exynos.c b/drivers/usb/host/ehci-exynos.c
index 3ca4c5c..c4c90be 100644
--- a/drivers/usb/host/ehci-exynos.c
+++ b/drivers/usb/host/ehci-exynos.c
@@ -42,11 +42,14 @@  DECLARE_GLOBAL_DATA_PTR;
  */
 struct exynos_ehci {
 	struct exynos_usb_phy *usb;
-	unsigned int *hcd;
+	struct ehci_hccr *hcd;
 };
 
+static struct exynos_ehci exynos;
+
 static int exynos_usb_parse_dt(const void *blob, struct exynos_ehci *exynos)
 {
+	fdt_addr_t addr;
 	unsigned int node;
 	int depth;
 
@@ -59,12 +62,14 @@  static int exynos_usb_parse_dt(const void *blob, struct exynos_ehci *exynos)
 	/*
 	 * Get the base address for EHCI controller from the device node
 	 */
-	exynos->hcd = (unsigned int *)fdtdec_get_addr(blob, node, "reg");
-	if (exynos->hcd == NULL) {
+	addr = fdtdec_get_addr(blob, node, "reg");
+	if (addr == FDT_ADDR_T_NONE) {
 		debug("Can't get the EHCI register address\n");
 		return -ENXIO;
 	}
 
+	exynos->hcd = (struct ehci_hccr *)addr;
+
 	depth = 0;
 	node = fdtdec_next_compatible_subnode(blob, node,
 					COMPAT_SAMSUNG_EXYNOS_USB_PHY, &depth);
@@ -144,20 +149,16 @@  static void reset_usb_phy(struct exynos_usb_phy *usb)
  */
 int ehci_hcd_init(int index, struct ehci_hccr **hccr, struct ehci_hcor **hcor)
 {
-	struct exynos_ehci *exynos = NULL;
+	struct exynos_ehci *ctx = &exynos;
 
-	exynos = (struct exynos_ehci *)
-			kzalloc(sizeof(struct exynos_ehci), GFP_KERNEL);
-	if (!exynos) {
-		debug("failed to allocate exynos ehci context\n");
-		return -ENOMEM;
+	if (exynos_usb_parse_dt(gd->fdt_blob, ctx)) {
+		debug("Unable to parse device tree for ehci-exynos\n");
+		return -ENODEV;
 	}
 
-	exynos_usb_parse_dt(gd->fdt_blob, exynos);
+	setup_usb_phy(ctx->usb);
 
-	setup_usb_phy(exynos->usb);
-
-	*hccr = (struct ehci_hccr *)(exynos->hcd);
+	*hccr = ctx->hcd;
 	*hcor = (struct ehci_hcor *)((uint32_t) *hccr
 				+ HC_LENGTH(ehci_readl(&(*hccr)->cr_capbase)));
 
@@ -165,8 +166,6 @@  int ehci_hcd_init(int index, struct ehci_hccr **hccr, struct ehci_hcor **hcor)
 		(uint32_t)*hccr, (uint32_t)*hcor,
 		(uint32_t)HC_LENGTH(ehci_readl(&(*hccr)->cr_capbase)));
 
-	kfree(exynos);
-
 	return 0;
 }
 
@@ -176,20 +175,9 @@  int ehci_hcd_init(int index, struct ehci_hccr **hccr, struct ehci_hcor **hcor)
  */
 int ehci_hcd_stop(int index)
 {
-	struct exynos_ehci *exynos = NULL;
-
-	exynos = (struct exynos_ehci *)
-			kzalloc(sizeof(struct exynos_ehci), GFP_KERNEL);
-	if (!exynos) {
-		debug("failed to allocate exynos ehci context\n");
-		return -ENOMEM;
-	}
-
-	exynos_usb_parse_dt(gd->fdt_blob, exynos);
-
-	reset_usb_phy(exynos->usb);
+	struct exynos_ehci *ctx = &exynos;
 
-	kfree(exynos);
+	reset_usb_phy(ctx->usb);
 
 	return 0;
 }