683 lines
17 KiB
C
683 lines
17 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* phy-brcm-usb.c - Broadcom USB Phy Driver
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*
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* Copyright (C) 2015-2017 Broadcom
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*/
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/phy/phy.h>
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#include <linux/platform_device.h>
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#include <linux/interrupt.h>
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#include <linux/soc/brcmstb/brcmstb.h>
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#include <dt-bindings/phy/phy.h>
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#include <linux/mfd/syscon.h>
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#include <linux/suspend.h>
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#include "phy-brcm-usb-init.h"
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static DEFINE_MUTEX(sysfs_lock);
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enum brcm_usb_phy_id {
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BRCM_USB_PHY_2_0 = 0,
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BRCM_USB_PHY_3_0,
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BRCM_USB_PHY_ID_MAX
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};
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struct value_to_name_map {
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int value;
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const char *name;
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};
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struct match_chip_info {
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void (*init_func)(struct brcm_usb_init_params *params);
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u8 required_regs[BRCM_REGS_MAX + 1];
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u8 optional_reg;
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};
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static const struct value_to_name_map brcm_dr_mode_to_name[] = {
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{ USB_CTLR_MODE_HOST, "host" },
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{ USB_CTLR_MODE_DEVICE, "peripheral" },
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{ USB_CTLR_MODE_DRD, "drd" },
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{ USB_CTLR_MODE_TYPEC_PD, "typec-pd" }
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};
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static const struct value_to_name_map brcm_dual_mode_to_name[] = {
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{ 0, "host" },
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{ 1, "device" },
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{ 2, "auto" },
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};
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struct brcm_usb_phy {
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struct phy *phy;
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unsigned int id;
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bool inited;
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};
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struct brcm_usb_phy_data {
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struct brcm_usb_init_params ini;
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bool has_eohci;
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bool has_xhci;
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struct clk *usb_20_clk;
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struct clk *usb_30_clk;
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struct clk *suspend_clk;
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struct mutex mutex; /* serialize phy init */
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int init_count;
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int wake_irq;
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struct brcm_usb_phy phys[BRCM_USB_PHY_ID_MAX];
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struct notifier_block pm_notifier;
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bool pm_active;
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};
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static s8 *node_reg_names[BRCM_REGS_MAX] = {
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"crtl", "xhci_ec", "xhci_gbl", "usb_phy", "usb_mdio", "bdc_ec"
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};
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static int brcm_pm_notifier(struct notifier_block *notifier,
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unsigned long pm_event,
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void *unused)
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{
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struct brcm_usb_phy_data *priv =
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container_of(notifier, struct brcm_usb_phy_data, pm_notifier);
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switch (pm_event) {
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case PM_HIBERNATION_PREPARE:
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case PM_SUSPEND_PREPARE:
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priv->pm_active = true;
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break;
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case PM_POST_RESTORE:
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case PM_POST_HIBERNATION:
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case PM_POST_SUSPEND:
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priv->pm_active = false;
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break;
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}
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return NOTIFY_DONE;
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}
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static irqreturn_t brcm_usb_phy_wake_isr(int irq, void *dev_id)
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{
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struct device *dev = dev_id;
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pm_wakeup_event(dev, 0);
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return IRQ_HANDLED;
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}
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static int brcm_usb_phy_init(struct phy *gphy)
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{
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struct brcm_usb_phy *phy = phy_get_drvdata(gphy);
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struct brcm_usb_phy_data *priv =
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container_of(phy, struct brcm_usb_phy_data, phys[phy->id]);
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if (priv->pm_active)
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return 0;
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/*
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* Use a lock to make sure a second caller waits until
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* the base phy is inited before using it.
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*/
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mutex_lock(&priv->mutex);
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if (priv->init_count++ == 0) {
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clk_prepare_enable(priv->usb_20_clk);
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clk_prepare_enable(priv->usb_30_clk);
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clk_prepare_enable(priv->suspend_clk);
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brcm_usb_init_common(&priv->ini);
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}
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mutex_unlock(&priv->mutex);
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if (phy->id == BRCM_USB_PHY_2_0)
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brcm_usb_init_eohci(&priv->ini);
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else if (phy->id == BRCM_USB_PHY_3_0)
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brcm_usb_init_xhci(&priv->ini);
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phy->inited = true;
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dev_dbg(&gphy->dev, "INIT, id: %d, total: %d\n", phy->id,
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priv->init_count);
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return 0;
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}
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static int brcm_usb_phy_exit(struct phy *gphy)
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{
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struct brcm_usb_phy *phy = phy_get_drvdata(gphy);
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struct brcm_usb_phy_data *priv =
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container_of(phy, struct brcm_usb_phy_data, phys[phy->id]);
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if (priv->pm_active)
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return 0;
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dev_dbg(&gphy->dev, "EXIT\n");
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if (phy->id == BRCM_USB_PHY_2_0)
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brcm_usb_uninit_eohci(&priv->ini);
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if (phy->id == BRCM_USB_PHY_3_0)
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brcm_usb_uninit_xhci(&priv->ini);
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/* If both xhci and eohci are gone, reset everything else */
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mutex_lock(&priv->mutex);
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if (--priv->init_count == 0) {
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brcm_usb_uninit_common(&priv->ini);
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clk_disable_unprepare(priv->usb_20_clk);
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clk_disable_unprepare(priv->usb_30_clk);
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clk_disable_unprepare(priv->suspend_clk);
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}
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mutex_unlock(&priv->mutex);
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phy->inited = false;
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return 0;
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}
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static const struct phy_ops brcm_usb_phy_ops = {
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.init = brcm_usb_phy_init,
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.exit = brcm_usb_phy_exit,
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.owner = THIS_MODULE,
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};
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static struct phy *brcm_usb_phy_xlate(struct device *dev,
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struct of_phandle_args *args)
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{
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struct brcm_usb_phy_data *data = dev_get_drvdata(dev);
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/*
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* values 0 and 1 are for backward compatibility with
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* device tree nodes from older bootloaders.
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*/
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switch (args->args[0]) {
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case 0:
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case PHY_TYPE_USB2:
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if (data->phys[BRCM_USB_PHY_2_0].phy)
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return data->phys[BRCM_USB_PHY_2_0].phy;
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dev_warn(dev, "Error, 2.0 Phy not found\n");
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break;
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case 1:
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case PHY_TYPE_USB3:
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if (data->phys[BRCM_USB_PHY_3_0].phy)
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return data->phys[BRCM_USB_PHY_3_0].phy;
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dev_warn(dev, "Error, 3.0 Phy not found\n");
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break;
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}
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return ERR_PTR(-ENODEV);
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}
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static int name_to_value(const struct value_to_name_map *table, int count,
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const char *name, int *value)
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{
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int x;
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*value = 0;
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for (x = 0; x < count; x++) {
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if (sysfs_streq(name, table[x].name)) {
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*value = x;
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return 0;
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}
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}
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return -EINVAL;
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}
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static const char *value_to_name(const struct value_to_name_map *table, int count,
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int value)
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{
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if (value >= count)
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return "unknown";
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return table[value].name;
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}
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static ssize_t dr_mode_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct brcm_usb_phy_data *priv = dev_get_drvdata(dev);
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return sprintf(buf, "%s\n",
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value_to_name(&brcm_dr_mode_to_name[0],
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ARRAY_SIZE(brcm_dr_mode_to_name),
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priv->ini.mode));
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}
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static DEVICE_ATTR_RO(dr_mode);
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static ssize_t dual_select_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t len)
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{
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struct brcm_usb_phy_data *priv = dev_get_drvdata(dev);
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int value;
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int res;
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mutex_lock(&sysfs_lock);
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res = name_to_value(&brcm_dual_mode_to_name[0],
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ARRAY_SIZE(brcm_dual_mode_to_name), buf, &value);
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if (!res) {
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brcm_usb_set_dual_select(&priv->ini, value);
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res = len;
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}
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mutex_unlock(&sysfs_lock);
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return res;
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}
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static ssize_t dual_select_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct brcm_usb_phy_data *priv = dev_get_drvdata(dev);
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int value;
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mutex_lock(&sysfs_lock);
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value = brcm_usb_get_dual_select(&priv->ini);
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mutex_unlock(&sysfs_lock);
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return sprintf(buf, "%s\n",
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value_to_name(&brcm_dual_mode_to_name[0],
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ARRAY_SIZE(brcm_dual_mode_to_name),
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value));
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}
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static DEVICE_ATTR_RW(dual_select);
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static struct attribute *brcm_usb_phy_attrs[] = {
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&dev_attr_dr_mode.attr,
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&dev_attr_dual_select.attr,
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NULL
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};
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static const struct attribute_group brcm_usb_phy_group = {
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.attrs = brcm_usb_phy_attrs,
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};
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static const struct match_chip_info chip_info_4908 = {
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.init_func = &brcm_usb_dvr_init_4908,
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.required_regs = {
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BRCM_REGS_CTRL,
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BRCM_REGS_XHCI_EC,
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-1,
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},
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};
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static const struct match_chip_info chip_info_7216 = {
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.init_func = &brcm_usb_dvr_init_7216,
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.required_regs = {
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BRCM_REGS_CTRL,
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BRCM_REGS_XHCI_EC,
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BRCM_REGS_XHCI_GBL,
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-1,
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},
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};
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static const struct match_chip_info chip_info_7211b0 = {
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.init_func = &brcm_usb_dvr_init_7211b0,
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.required_regs = {
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BRCM_REGS_CTRL,
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BRCM_REGS_XHCI_EC,
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BRCM_REGS_XHCI_GBL,
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BRCM_REGS_USB_PHY,
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BRCM_REGS_USB_MDIO,
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-1,
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},
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.optional_reg = BRCM_REGS_BDC_EC,
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};
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static const struct match_chip_info chip_info_7445 = {
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.init_func = &brcm_usb_dvr_init_7445,
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.required_regs = {
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BRCM_REGS_CTRL,
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BRCM_REGS_XHCI_EC,
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-1,
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},
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};
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static const struct of_device_id brcm_usb_dt_ids[] = {
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{
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.compatible = "brcm,bcm4908-usb-phy",
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.data = &chip_info_4908,
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},
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{
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.compatible = "brcm,bcm7216-usb-phy",
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.data = &chip_info_7216,
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},
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{
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.compatible = "brcm,bcm7211-usb-phy",
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.data = &chip_info_7211b0,
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},
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{
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.compatible = "brcm,brcmstb-usb-phy",
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.data = &chip_info_7445,
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},
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{ /* sentinel */ }
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};
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static int brcm_usb_get_regs(struct platform_device *pdev,
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enum brcmusb_reg_sel regs,
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struct brcm_usb_init_params *ini,
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bool optional)
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{
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struct resource *res;
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/* Older DT nodes have ctrl and optional xhci_ec by index only */
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res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
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node_reg_names[regs]);
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if (res == NULL) {
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if (regs == BRCM_REGS_CTRL) {
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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} else if (regs == BRCM_REGS_XHCI_EC) {
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res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
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/* XHCI_EC registers are optional */
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if (res == NULL)
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return 0;
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}
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if (res == NULL) {
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if (optional) {
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dev_dbg(&pdev->dev,
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"Optional reg %s not found\n",
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node_reg_names[regs]);
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return 0;
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}
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dev_err(&pdev->dev, "can't get %s base addr\n",
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node_reg_names[regs]);
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return 1;
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}
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}
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ini->regs[regs] = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(ini->regs[regs])) {
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dev_err(&pdev->dev, "can't map %s register space\n",
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node_reg_names[regs]);
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return 1;
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}
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return 0;
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}
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static int brcm_usb_phy_dvr_init(struct platform_device *pdev,
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struct brcm_usb_phy_data *priv,
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struct device_node *dn)
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{
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struct device *dev = &pdev->dev;
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struct phy *gphy = NULL;
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int err;
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priv->usb_20_clk = of_clk_get_by_name(dn, "sw_usb");
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if (IS_ERR(priv->usb_20_clk)) {
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if (PTR_ERR(priv->usb_20_clk) == -EPROBE_DEFER)
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return -EPROBE_DEFER;
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dev_info(dev, "Clock not found in Device Tree\n");
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priv->usb_20_clk = NULL;
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}
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err = clk_prepare_enable(priv->usb_20_clk);
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if (err)
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return err;
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if (priv->has_eohci) {
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gphy = devm_phy_create(dev, NULL, &brcm_usb_phy_ops);
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if (IS_ERR(gphy)) {
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dev_err(dev, "failed to create EHCI/OHCI PHY\n");
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return PTR_ERR(gphy);
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}
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priv->phys[BRCM_USB_PHY_2_0].phy = gphy;
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priv->phys[BRCM_USB_PHY_2_0].id = BRCM_USB_PHY_2_0;
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phy_set_drvdata(gphy, &priv->phys[BRCM_USB_PHY_2_0]);
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}
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if (priv->has_xhci) {
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gphy = devm_phy_create(dev, NULL, &brcm_usb_phy_ops);
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if (IS_ERR(gphy)) {
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dev_err(dev, "failed to create XHCI PHY\n");
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return PTR_ERR(gphy);
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}
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priv->phys[BRCM_USB_PHY_3_0].phy = gphy;
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priv->phys[BRCM_USB_PHY_3_0].id = BRCM_USB_PHY_3_0;
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phy_set_drvdata(gphy, &priv->phys[BRCM_USB_PHY_3_0]);
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priv->usb_30_clk = of_clk_get_by_name(dn, "sw_usb3");
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if (IS_ERR(priv->usb_30_clk)) {
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if (PTR_ERR(priv->usb_30_clk) == -EPROBE_DEFER)
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return -EPROBE_DEFER;
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dev_info(dev,
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"USB3.0 clock not found in Device Tree\n");
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priv->usb_30_clk = NULL;
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}
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err = clk_prepare_enable(priv->usb_30_clk);
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if (err)
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return err;
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}
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priv->suspend_clk = clk_get(dev, "usb0_freerun");
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if (IS_ERR(priv->suspend_clk)) {
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if (PTR_ERR(priv->suspend_clk) == -EPROBE_DEFER)
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return -EPROBE_DEFER;
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dev_err(dev, "Suspend Clock not found in Device Tree\n");
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priv->suspend_clk = NULL;
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}
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priv->wake_irq = platform_get_irq_byname_optional(pdev, "wake");
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if (priv->wake_irq < 0)
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priv->wake_irq = platform_get_irq_byname_optional(pdev, "wakeup");
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if (priv->wake_irq >= 0) {
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err = devm_request_irq(dev, priv->wake_irq,
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brcm_usb_phy_wake_isr, 0,
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dev_name(dev), dev);
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if (err < 0)
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return err;
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device_set_wakeup_capable(dev, 1);
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} else {
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dev_info(dev,
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"Wake interrupt missing, system wake not supported\n");
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}
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return 0;
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}
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static int brcm_usb_phy_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct brcm_usb_phy_data *priv;
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struct phy_provider *phy_provider;
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struct device_node *dn = pdev->dev.of_node;
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int err;
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const char *mode;
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const struct match_chip_info *info;
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struct regmap *rmap;
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int x;
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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platform_set_drvdata(pdev, priv);
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priv->ini.family_id = brcmstb_get_family_id();
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priv->ini.product_id = brcmstb_get_product_id();
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info = of_device_get_match_data(&pdev->dev);
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if (!info)
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return -ENOENT;
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info->init_func(&priv->ini);
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dev_dbg(dev, "Best mapping table is for %s\n",
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priv->ini.family_name);
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of_property_read_u32(dn, "brcm,ipp", &priv->ini.ipp);
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of_property_read_u32(dn, "brcm,ioc", &priv->ini.ioc);
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|
priv->ini.mode = USB_CTLR_MODE_HOST;
|
|
err = of_property_read_string(dn, "dr_mode", &mode);
|
|
if (err == 0) {
|
|
name_to_value(&brcm_dr_mode_to_name[0],
|
|
ARRAY_SIZE(brcm_dr_mode_to_name),
|
|
mode, &priv->ini.mode);
|
|
}
|
|
if (of_property_read_bool(dn, "brcm,has-xhci"))
|
|
priv->has_xhci = true;
|
|
if (of_property_read_bool(dn, "brcm,has-eohci"))
|
|
priv->has_eohci = true;
|
|
|
|
for (x = 0; x < BRCM_REGS_MAX; x++) {
|
|
if (info->required_regs[x] >= BRCM_REGS_MAX)
|
|
break;
|
|
|
|
err = brcm_usb_get_regs(pdev, info->required_regs[x],
|
|
&priv->ini, false);
|
|
if (err)
|
|
return -EINVAL;
|
|
}
|
|
if (info->optional_reg) {
|
|
err = brcm_usb_get_regs(pdev, info->optional_reg,
|
|
&priv->ini, true);
|
|
if (err)
|
|
return -EINVAL;
|
|
}
|
|
|
|
err = brcm_usb_phy_dvr_init(pdev, priv, dn);
|
|
if (err)
|
|
return err;
|
|
|
|
priv->pm_notifier.notifier_call = brcm_pm_notifier;
|
|
register_pm_notifier(&priv->pm_notifier);
|
|
|
|
mutex_init(&priv->mutex);
|
|
|
|
/* make sure invert settings are correct */
|
|
brcm_usb_init_ipp(&priv->ini);
|
|
|
|
/*
|
|
* Create sysfs entries for mode.
|
|
* Remove "dual_select" attribute if not in dual mode
|
|
*/
|
|
if (priv->ini.mode != USB_CTLR_MODE_DRD)
|
|
brcm_usb_phy_attrs[1] = NULL;
|
|
err = sysfs_create_group(&dev->kobj, &brcm_usb_phy_group);
|
|
if (err)
|
|
dev_warn(dev, "Error creating sysfs attributes\n");
|
|
|
|
/* Get piarbctl syscon if it exists */
|
|
rmap = syscon_regmap_lookup_by_phandle(dev->of_node,
|
|
"syscon-piarbctl");
|
|
if (IS_ERR(rmap))
|
|
rmap = syscon_regmap_lookup_by_phandle(dev->of_node,
|
|
"brcm,syscon-piarbctl");
|
|
if (!IS_ERR(rmap))
|
|
priv->ini.syscon_piarbctl = rmap;
|
|
|
|
/* start with everything off */
|
|
if (priv->has_xhci)
|
|
brcm_usb_uninit_xhci(&priv->ini);
|
|
if (priv->has_eohci)
|
|
brcm_usb_uninit_eohci(&priv->ini);
|
|
brcm_usb_uninit_common(&priv->ini);
|
|
clk_disable_unprepare(priv->usb_20_clk);
|
|
clk_disable_unprepare(priv->usb_30_clk);
|
|
|
|
phy_provider = devm_of_phy_provider_register(dev, brcm_usb_phy_xlate);
|
|
|
|
return PTR_ERR_OR_ZERO(phy_provider);
|
|
}
|
|
|
|
static int brcm_usb_phy_remove(struct platform_device *pdev)
|
|
{
|
|
struct brcm_usb_phy_data *priv = dev_get_drvdata(&pdev->dev);
|
|
|
|
sysfs_remove_group(&pdev->dev.kobj, &brcm_usb_phy_group);
|
|
unregister_pm_notifier(&priv->pm_notifier);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int brcm_usb_phy_suspend(struct device *dev)
|
|
{
|
|
struct brcm_usb_phy_data *priv = dev_get_drvdata(dev);
|
|
|
|
if (priv->init_count) {
|
|
dev_dbg(dev, "SUSPEND\n");
|
|
priv->ini.wake_enabled = device_may_wakeup(dev);
|
|
if (priv->phys[BRCM_USB_PHY_3_0].inited)
|
|
brcm_usb_uninit_xhci(&priv->ini);
|
|
if (priv->phys[BRCM_USB_PHY_2_0].inited)
|
|
brcm_usb_uninit_eohci(&priv->ini);
|
|
brcm_usb_uninit_common(&priv->ini);
|
|
|
|
/*
|
|
* Handle the clocks unless needed for wake. This has
|
|
* to work for both older XHCI->3.0-clks, EOHCI->2.0-clks
|
|
* and newer XHCI->2.0-clks/3.0-clks.
|
|
*/
|
|
|
|
if (!priv->ini.wake_enabled) {
|
|
if (priv->phys[BRCM_USB_PHY_3_0].inited)
|
|
clk_disable_unprepare(priv->usb_30_clk);
|
|
if (priv->phys[BRCM_USB_PHY_2_0].inited ||
|
|
!priv->has_eohci)
|
|
clk_disable_unprepare(priv->usb_20_clk);
|
|
}
|
|
if (priv->wake_irq >= 0)
|
|
enable_irq_wake(priv->wake_irq);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int brcm_usb_phy_resume(struct device *dev)
|
|
{
|
|
struct brcm_usb_phy_data *priv = dev_get_drvdata(dev);
|
|
|
|
if (!priv->ini.wake_enabled) {
|
|
clk_prepare_enable(priv->usb_20_clk);
|
|
clk_prepare_enable(priv->usb_30_clk);
|
|
}
|
|
brcm_usb_init_ipp(&priv->ini);
|
|
|
|
/*
|
|
* Initialize anything that was previously initialized.
|
|
* Uninitialize anything that wasn't previously initialized.
|
|
*/
|
|
if (priv->init_count) {
|
|
dev_dbg(dev, "RESUME\n");
|
|
if (priv->wake_irq >= 0)
|
|
disable_irq_wake(priv->wake_irq);
|
|
brcm_usb_init_common(&priv->ini);
|
|
if (priv->phys[BRCM_USB_PHY_2_0].inited) {
|
|
brcm_usb_init_eohci(&priv->ini);
|
|
} else if (priv->has_eohci) {
|
|
brcm_usb_uninit_eohci(&priv->ini);
|
|
clk_disable_unprepare(priv->usb_20_clk);
|
|
}
|
|
if (priv->phys[BRCM_USB_PHY_3_0].inited) {
|
|
brcm_usb_init_xhci(&priv->ini);
|
|
} else if (priv->has_xhci) {
|
|
brcm_usb_uninit_xhci(&priv->ini);
|
|
clk_disable_unprepare(priv->usb_30_clk);
|
|
if (!priv->has_eohci)
|
|
clk_disable_unprepare(priv->usb_20_clk);
|
|
}
|
|
} else {
|
|
if (priv->has_xhci)
|
|
brcm_usb_uninit_xhci(&priv->ini);
|
|
if (priv->has_eohci)
|
|
brcm_usb_uninit_eohci(&priv->ini);
|
|
brcm_usb_uninit_common(&priv->ini);
|
|
clk_disable_unprepare(priv->usb_20_clk);
|
|
clk_disable_unprepare(priv->usb_30_clk);
|
|
}
|
|
priv->ini.wake_enabled = false;
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_PM_SLEEP */
|
|
|
|
static const struct dev_pm_ops brcm_usb_phy_pm_ops = {
|
|
SET_LATE_SYSTEM_SLEEP_PM_OPS(brcm_usb_phy_suspend, brcm_usb_phy_resume)
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(of, brcm_usb_dt_ids);
|
|
|
|
static struct platform_driver brcm_usb_driver = {
|
|
.probe = brcm_usb_phy_probe,
|
|
.remove = brcm_usb_phy_remove,
|
|
.driver = {
|
|
.name = "brcmstb-usb-phy",
|
|
.pm = &brcm_usb_phy_pm_ops,
|
|
.of_match_table = brcm_usb_dt_ids,
|
|
},
|
|
};
|
|
|
|
module_platform_driver(brcm_usb_driver);
|
|
|
|
MODULE_ALIAS("platform:brcmstb-usb-phy");
|
|
MODULE_AUTHOR("Al Cooper <acooper@broadcom.com>");
|
|
MODULE_DESCRIPTION("BRCM USB PHY driver");
|
|
MODULE_LICENSE("GPL v2");
|