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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2015 Alexey Brodkin <abrodkin@synopsys.com>
*/
#include <common.h>
#include <clk.h>
#include <dm/ofnode.h>
#include <generic-phy.h>
#include <reset.h>
#include <asm/io.h>
#include <dm.h>
#include "ehci.h"
#include <power/regulator.h>
/*
* Even though here we don't explicitly use "struct ehci_ctrl"
* ehci_register() expects it to be the first thing that resides in
* device's private data.
*/
struct generic_ehci {
struct ehci_ctrl ctrl;
struct clk *clocks;
struct reset_ctl *resets;
struct phy phy;
#ifdef CONFIG_DM_REGULATOR
struct udevice *vbus_supply;
#endif
int clock_count;
int reset_count;
};
#ifdef CONFIG_DM_REGULATOR
static int ehci_enable_vbus_supply(struct udevice *dev)
{
struct generic_ehci *priv = dev_get_priv(dev);
int ret;
ret = device_get_supply_regulator(dev, "vbus-supply",
&priv->vbus_supply);
if (ret && ret != -ENOENT)
return ret;
if (priv->vbus_supply) {
ret = regulator_set_enable(priv->vbus_supply, true);
if (ret) {
dev_err(dev, "Error enabling VBUS supply\n");
return ret;
}
} else {
dev_dbg(dev, "No vbus supply\n");
}
return 0;
}
static int ehci_disable_vbus_supply(struct generic_ehci *priv)
{
if (priv->vbus_supply)
return regulator_set_enable(priv->vbus_supply, false);
else
return 0;
}
#else
static int ehci_enable_vbus_supply(struct udevice *dev)
{
return 0;
}
static int ehci_disable_vbus_supply(struct generic_ehci *priv)
{
return 0;
}
#endif
static int ehci_usb_probe(struct udevice *dev)
{
struct generic_ehci *priv = dev_get_priv(dev);
struct ehci_hccr *hccr;
struct ehci_hcor *hcor;
int i, err, ret, clock_nb, reset_nb;
err = 0;
priv->clock_count = 0;
clock_nb = ofnode_count_phandle_with_args(dev_ofnode(dev), "clocks",
"#clock-cells");
if (clock_nb > 0) {
priv->clocks = devm_kcalloc(dev, clock_nb, sizeof(struct clk),
GFP_KERNEL);
if (!priv->clocks)
return -ENOMEM;
for (i = 0; i < clock_nb; i++) {
err = clk_get_by_index(dev, i, &priv->clocks[i]);
if (err < 0)
break;
err = clk_enable(&priv->clocks[i]);
if (err && err != -ENOSYS) {
dev_err(dev, "failed to enable clock %d\n", i);
clk_free(&priv->clocks[i]);
goto clk_err;
}
priv->clock_count++;
}
} else {
if (clock_nb != -ENOENT) {
dev_err(dev, "failed to get clock phandle(%d)\n",
clock_nb);
return clock_nb;
}
}
priv->reset_count = 0;
reset_nb = ofnode_count_phandle_with_args(dev_ofnode(dev), "resets",
"#reset-cells");
if (reset_nb > 0) {
priv->resets = devm_kcalloc(dev, reset_nb,
sizeof(struct reset_ctl),
GFP_KERNEL);
if (!priv->resets)
return -ENOMEM;
for (i = 0; i < reset_nb; i++) {
err = reset_get_by_index(dev, i, &priv->resets[i]);
if (err < 0)
break;
if (reset_deassert(&priv->resets[i])) {
dev_err(dev, "failed to deassert reset %d\n",
i);
reset_free(&priv->resets[i]);
goto reset_err;
}
priv->reset_count++;
}
} else {
if (reset_nb != -ENOENT) {
dev_err(dev, "failed to get reset phandle(%d)\n",
reset_nb);
goto clk_err;
}
}
err = ehci_enable_vbus_supply(dev);
if (err)
goto reset_err;
err = ehci_setup_phy(dev, &priv->phy, 0);
if (err)
goto regulator_err;
hccr = map_physmem(dev_read_addr(dev), 0x100, MAP_NOCACHE);
hcor = (struct ehci_hcor *)((uintptr_t)hccr +
HC_LENGTH(ehci_readl(&hccr->cr_capbase)));
err = ehci_register(dev, hccr, hcor, NULL, 0, USB_INIT_HOST);
if (err)
goto phy_err;
return 0;
phy_err:
ret = ehci_shutdown_phy(dev, &priv->phy);
if (ret)
dev_err(dev, "failed to shutdown usb phy\n");
regulator_err:
ret = ehci_disable_vbus_supply(priv);
if (ret)
dev_err(dev, "failed to disable VBUS supply\n");
reset_err:
ret = reset_release_all(priv->resets, priv->reset_count);
if (ret)
dev_err(dev, "failed to assert all resets\n");
clk_err:
ret = clk_release_all(priv->clocks, priv->clock_count);
if (ret)
dev_err(dev, "failed to disable all clocks\n");
return err;
}
static int ehci_usb_remove(struct udevice *dev)
{
struct generic_ehci *priv = dev_get_priv(dev);
int ret;
ret = ehci_deregister(dev);
if (ret)
return ret;
ret = ehci_shutdown_phy(dev, &priv->phy);
if (ret)
return ret;
ret = ehci_disable_vbus_supply(priv);
if (ret)
return ret;
ret = reset_release_all(priv->resets, priv->reset_count);
if (ret)
return ret;
return clk_release_all(priv->clocks, priv->clock_count);
}
static const struct udevice_id ehci_usb_ids[] = {
{ .compatible = "generic-ehci" },
{ }
};
U_BOOT_DRIVER(ehci_generic) = {
.name = "ehci_generic",
.id = UCLASS_USB,
.of_match = ehci_usb_ids,
.probe = ehci_usb_probe,
.remove = ehci_usb_remove,
.ops = &ehci_usb_ops,
.priv_auto_alloc_size = sizeof(struct generic_ehci),
.flags = DM_FLAG_ALLOC_PRIV_DMA,
};
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