mirror of
https://github.com/AsahiLinux/u-boot
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5c349e179d
Add vbus-supply regulator support. On some board vbus is not controlled by the phy but by an external regulator. Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
223 lines
4.7 KiB
C
223 lines
4.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2015 Alexey Brodkin <abrodkin@synopsys.com>
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*/
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#include <common.h>
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#include <clk.h>
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#include <dm/ofnode.h>
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#include <generic-phy.h>
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#include <reset.h>
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#include <asm/io.h>
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#include <dm.h>
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#include "ehci.h"
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#include <power/regulator.h>
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/*
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* Even though here we don't explicitly use "struct ehci_ctrl"
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* ehci_register() expects it to be the first thing that resides in
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* device's private data.
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*/
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struct generic_ehci {
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struct ehci_ctrl ctrl;
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struct clk *clocks;
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struct reset_ctl *resets;
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struct phy phy;
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#ifdef CONFIG_DM_REGULATOR
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struct udevice *vbus_supply;
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#endif
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int clock_count;
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int reset_count;
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};
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#ifdef CONFIG_DM_REGULATOR
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static int ehci_enable_vbus_supply(struct udevice *dev)
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{
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struct generic_ehci *priv = dev_get_priv(dev);
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int ret;
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ret = device_get_supply_regulator(dev, "vbus-supply",
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&priv->vbus_supply);
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if (ret && ret != -ENOENT)
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return ret;
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if (priv->vbus_supply) {
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ret = regulator_set_enable(priv->vbus_supply, true);
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if (ret) {
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dev_err(dev, "Error enabling VBUS supply\n");
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return ret;
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}
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} else {
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dev_dbg(dev, "No vbus supply\n");
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}
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return 0;
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}
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static int ehci_disable_vbus_supply(struct generic_ehci *priv)
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{
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if (priv->vbus_supply)
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return regulator_set_enable(priv->vbus_supply, false);
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else
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return 0;
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}
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#else
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static int ehci_enable_vbus_supply(struct udevice *dev)
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{
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return 0;
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}
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static int ehci_disable_vbus_supply(struct generic_ehci *priv)
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{
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return 0;
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}
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#endif
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static int ehci_usb_probe(struct udevice *dev)
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{
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struct generic_ehci *priv = dev_get_priv(dev);
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struct ehci_hccr *hccr;
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struct ehci_hcor *hcor;
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int i, err, ret, clock_nb, reset_nb;
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err = 0;
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priv->clock_count = 0;
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clock_nb = ofnode_count_phandle_with_args(dev_ofnode(dev), "clocks",
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"#clock-cells");
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if (clock_nb > 0) {
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priv->clocks = devm_kcalloc(dev, clock_nb, sizeof(struct clk),
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GFP_KERNEL);
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if (!priv->clocks)
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return -ENOMEM;
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for (i = 0; i < clock_nb; i++) {
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err = clk_get_by_index(dev, i, &priv->clocks[i]);
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if (err < 0)
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break;
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err = clk_enable(&priv->clocks[i]);
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if (err) {
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dev_err(dev, "failed to enable clock %d\n", i);
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clk_free(&priv->clocks[i]);
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goto clk_err;
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}
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priv->clock_count++;
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}
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} else {
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if (clock_nb != -ENOENT) {
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dev_err(dev, "failed to get clock phandle(%d)\n",
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clock_nb);
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return clock_nb;
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}
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}
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priv->reset_count = 0;
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reset_nb = ofnode_count_phandle_with_args(dev_ofnode(dev), "resets",
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"#reset-cells");
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if (reset_nb > 0) {
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priv->resets = devm_kcalloc(dev, reset_nb,
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sizeof(struct reset_ctl),
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GFP_KERNEL);
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if (!priv->resets)
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return -ENOMEM;
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for (i = 0; i < reset_nb; i++) {
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err = reset_get_by_index(dev, i, &priv->resets[i]);
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if (err < 0)
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break;
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if (reset_deassert(&priv->resets[i])) {
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dev_err(dev, "failed to deassert reset %d\n",
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i);
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reset_free(&priv->resets[i]);
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goto reset_err;
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}
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priv->reset_count++;
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}
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} else {
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if (reset_nb != -ENOENT) {
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dev_err(dev, "failed to get reset phandle(%d)\n",
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reset_nb);
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goto clk_err;
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}
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}
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err = ehci_enable_vbus_supply(dev);
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if (err)
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goto reset_err;
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err = ehci_setup_phy(dev, &priv->phy, 0);
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if (err)
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goto regulator_err;
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hccr = map_physmem(dev_read_addr(dev), 0x100, MAP_NOCACHE);
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hcor = (struct ehci_hcor *)((uintptr_t)hccr +
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HC_LENGTH(ehci_readl(&hccr->cr_capbase)));
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err = ehci_register(dev, hccr, hcor, NULL, 0, USB_INIT_HOST);
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if (err)
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goto phy_err;
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return 0;
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phy_err:
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ret = ehci_shutdown_phy(dev, &priv->phy);
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if (ret)
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dev_err(dev, "failed to shutdown usb phy\n");
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regulator_err:
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ret = ehci_disable_vbus_supply(priv);
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if (ret)
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dev_err(dev, "failed to disable VBUS supply\n");
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reset_err:
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ret = reset_release_all(priv->resets, priv->reset_count);
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if (ret)
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dev_err(dev, "failed to assert all resets\n");
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clk_err:
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ret = clk_release_all(priv->clocks, priv->clock_count);
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if (ret)
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dev_err(dev, "failed to disable all clocks\n");
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return err;
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}
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static int ehci_usb_remove(struct udevice *dev)
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{
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struct generic_ehci *priv = dev_get_priv(dev);
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int ret;
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ret = ehci_deregister(dev);
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if (ret)
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return ret;
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ret = ehci_shutdown_phy(dev, &priv->phy);
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if (ret)
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return ret;
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ret = ehci_disable_vbus_supply(priv);
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if (ret)
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return ret;
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ret = reset_release_all(priv->resets, priv->reset_count);
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if (ret)
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return ret;
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return clk_release_all(priv->clocks, priv->clock_count);
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}
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static const struct udevice_id ehci_usb_ids[] = {
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{ .compatible = "generic-ehci" },
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{ }
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};
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U_BOOT_DRIVER(ehci_generic) = {
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.name = "ehci_generic",
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.id = UCLASS_USB,
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.of_match = ehci_usb_ids,
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.probe = ehci_usb_probe,
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.remove = ehci_usb_remove,
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.ops = &ehci_usb_ops,
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.priv_auto_alloc_size = sizeof(struct generic_ehci),
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.flags = DM_FLAG_ALLOC_PRIV_DMA,
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};
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