EHCI: Exynos: Add fdt support

Adding fdt support to ehci-exynos in order to parse
register base addresses from the device node.

Signed-off-by: Vivek Gautam <gautam.vivek@samsung.com>
Signed-off-by: Rajeshwari Shinde <rajeshwari.s@samsung.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>

diff --git a/drivers/usb/host/ehci-exynos.c b/drivers/usb/host/ehci-exynos.c
index 9f0ed06..3ca4c5c 100644 (file)
--- a/drivers/usb/host/ehci-exynos.c
+++ b/drivers/usb/host/ehci-exynos.c
@@ -21,13 +21,71 @@
  */
 
 #include <common.h>
+#include <fdtdec.h>
+#include <libfdt.h>
+#include <malloc.h>
 #include <usb.h>
 #include <asm/arch/cpu.h>
 #include <asm/arch/ehci.h>
 #include <asm/arch/system.h>
 #include <asm/arch/power.h>
+#include <asm-generic/errno.h>
+#include <linux/compat.h>
 #include "ehci.h"
 
+/* Declare global data pointer */
+DECLARE_GLOBAL_DATA_PTR;
+
+/**
+ * Contains pointers to register base addresses
+ * for the usb controller.
+ */
+struct exynos_ehci {
+       struct exynos_usb_phy *usb;
+       unsigned int *hcd;
+};
+
+static int exynos_usb_parse_dt(const void *blob, struct exynos_ehci *exynos)
+{
+       unsigned int node;
+       int depth;
+
+       node = fdtdec_next_compatible(blob, 0, COMPAT_SAMSUNG_EXYNOS_EHCI);
+       if (node <= 0) {
+               debug("EHCI: Can't get device node for ehci\n");
+               return -ENODEV;
+       }
+
+       /*
+        * 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) {
+               debug("Can't get the EHCI register address\n");
+               return -ENXIO;
+       }
+
+       depth = 0;
+       node = fdtdec_next_compatible_subnode(blob, node,
+                                       COMPAT_SAMSUNG_EXYNOS_USB_PHY, &depth);
+       if (node <= 0) {
+               debug("EHCI: Can't get device node for usb-phy controller\n");
+               return -ENODEV;
+       }
+
+       /*
+        * Get the base address for usbphy from the device node
+        */
+       exynos->usb = (struct exynos_usb_phy *)fdtdec_get_addr(blob, node,
+                                                               "reg");
+       if (exynos->usb == NULL) {
+               debug("Can't get the usbphy register address\n");
+               return -ENXIO;
+       }
+
+       return 0;
+}
+
 /* Setup the EHCI host controller. */
 static void setup_usb_phy(struct exynos_usb_phy *usb)
 {
@@ -86,12 +144,20 @@ 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_usb_phy *usb;
+       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;
+       }
 
-       usb = (struct exynos_usb_phy *)samsung_get_base_usb_phy();
-       setup_usb_phy(usb);
+       exynos_usb_parse_dt(gd->fdt_blob, exynos);
 
-       *hccr = (struct ehci_hccr *)samsung_get_base_usb_ehci();
+       setup_usb_phy(exynos->usb);
+
+       *hccr = (struct ehci_hccr *)(exynos->hcd);
        *hcor = (struct ehci_hcor *)((uint32_t) *hccr
                                + HC_LENGTH(ehci_readl(&(*hccr)->cr_capbase)));
 
@@ -99,6 +165,8 @@ 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;
 }
 
@@ -108,10 +176,20 @@ int ehci_hcd_init(int index, struct ehci_hccr **hccr, struct ehci_hcor **hcor)
  */
 int ehci_hcd_stop(int index)
 {
-       struct exynos_usb_phy *usb;
+       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);
 
-       usb = (struct exynos_usb_phy *)samsung_get_base_usb_phy();
-       reset_usb_phy(usb);
+       kfree(exynos);
 
        return 0;
 }