usb: xhci-dwc3: Add support for clocks/resets
Some platforms, like the Allwinner H6, do not have a separate glue layer
around the dwc3. Instead, they rely on the clocks/resets/phys referenced
from the dwc3 DT node itself. Add support for enabling the clocks/resets
referenced from the dwc3 DT node.
Signed-off-by: Samuel Holland <samuel@sholland.org>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
diff --git a/drivers/usb/host/xhci-dwc3.c b/drivers/usb/host/xhci-dwc3.c
index 3e0ae80..5b12d13 100644
--- a/drivers/usb/host/xhci-dwc3.c
+++ b/drivers/usb/host/xhci-dwc3.c
@@ -7,10 +7,12 @@
* Author: Ramneek Mehresh<ramneek.mehresh@freescale.com>
*/
+#include <clk.h>
#include <common.h>
#include <dm.h>
#include <generic-phy.h>
#include <log.h>
+#include <reset.h>
#include <usb.h>
#include <dwc3-uboot.h>
#include <linux/delay.h>
@@ -21,7 +23,9 @@
#include <linux/usb/otg.h>
struct xhci_dwc3_plat {
+ struct clk_bulk clks;
struct phy_bulk phys;
+ struct reset_ctl_bulk resets;
};
void dwc3_set_mode(struct dwc3 *dwc3_reg, u32 mode)
@@ -111,6 +115,46 @@
}
#if CONFIG_IS_ENABLED(DM_USB)
+static int xhci_dwc3_reset_init(struct udevice *dev,
+ struct xhci_dwc3_plat *plat)
+{
+ int ret;
+
+ ret = reset_get_bulk(dev, &plat->resets);
+ if (ret == -ENOTSUPP || ret == -ENOENT)
+ return 0;
+ else if (ret)
+ return ret;
+
+ ret = reset_deassert_bulk(&plat->resets);
+ if (ret) {
+ reset_release_bulk(&plat->resets);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int xhci_dwc3_clk_init(struct udevice *dev,
+ struct xhci_dwc3_plat *plat)
+{
+ int ret;
+
+ ret = clk_get_bulk(dev, &plat->clks);
+ if (ret == -ENOSYS || ret == -ENOENT)
+ return 0;
+ if (ret)
+ return ret;
+
+ ret = clk_enable_bulk(&plat->clks);
+ if (ret) {
+ clk_release_bulk(&plat->clks);
+ return ret;
+ }
+
+ return 0;
+}
+
static int xhci_dwc3_probe(struct udevice *dev)
{
struct xhci_hcor *hcor;
@@ -122,6 +166,14 @@
u32 reg;
int ret;
+ ret = xhci_dwc3_reset_init(dev, plat);
+ if (ret)
+ return ret;
+
+ ret = xhci_dwc3_clk_init(dev, plat);
+ if (ret)
+ return ret;
+
hccr = (struct xhci_hccr *)((uintptr_t)dev_remap_addr(dev));
hcor = (struct xhci_hcor *)((uintptr_t)hccr +
HC_LENGTH(xhci_readl(&(hccr)->cr_capbase)));
@@ -171,6 +223,10 @@
dwc3_shutdown_phy(dev, &plat->phys);
+ clk_release_bulk(&plat->clks);
+
+ reset_release_bulk(&plat->resets);
+
return xhci_deregister(dev);
}