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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>
This commit is contained in:
Samuel Holland 2021-07-05 13:29:03 +01:00 committed by Marek Vasut
parent 70a98caf19
commit 91ce84a56b
1 changed files with 56 additions and 0 deletions
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56
drivers/usb/host/xhci-dwc3.c
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@ -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 @@ void dwc3_set_fladj(struct dwc3 *dwc3_reg, u32 val)
}
#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 @@ static int xhci_dwc3_probe(struct udevice *dev)
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 @@ static int xhci_dwc3_remove(struct udevice *dev)
dwc3_shutdown_phy(dev, &plat->phys);
clk_release_bulk(&plat->clks);
reset_release_bulk(&plat->resets);
return xhci_deregister(dev);
}