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