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/*
* phy-brcm-usb.c - Broadcom USB Phy Driver
*
* Copyright (C) 2015-2017 Broadcom
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#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 "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;
};
static 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 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 mutex mutex; /* serialize phy init */
int init_count;
struct brcm_usb_phy phys[BRCM_USB_PHY_ID_MAX];
};
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]);
/*
* 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_enable(priv->usb_20_clk);
clk_enable(priv->usb_30_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]);
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(priv->usb_20_clk);
clk_disable(priv->usb_30_clk);
}
mutex_unlock(&priv->mutex);
phy->inited = false;
return 0;
}
static 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,
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(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(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.mode));
}
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) {
brcm_usb_init_set_dual_select(&priv->ini, value);
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_init_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 int brcm_usb_phy_dvr_init(struct device *dev,
struct brcm_usb_phy_data *priv,
struct device_node *dn)
{
struct phy *gphy;
int err;
priv->usb_20_clk = of_clk_get_by_name(dn, "sw_usb");
if (IS_ERR(priv->usb_20_clk)) {
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)) {
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;
}
return 0;
}
static int brcm_usb_phy_probe(struct platform_device *pdev)
{
struct resource *res;
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;
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();
brcm_usb_set_family_map(&priv->ini);
dev_dbg(dev, "Best mapping table is for %s\n",
priv->ini.family_name);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(dev, "can't get USB_CTRL base address\n");
return -EINVAL;
}
priv->ini.ctrl_regs = devm_ioremap_resource(dev, res);
if (IS_ERR(priv->ini.ctrl_regs)) {
dev_err(dev, "can't map CTRL register space\n");
return -EINVAL;
}
/* The XHCI EC registers are optional */
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
if (res) {
priv->ini.xhci_ec_regs =
devm_ioremap_resource(dev, res);
if (IS_ERR(priv->ini.xhci_ec_regs)) {
dev_err(dev, "can't map XHCI EC register space\n");
return -EINVAL;
}
}
of_property_read_u32(dn, "brcm,ipp", &priv->ini.ipp);
of_property_read_u32(dn, "brcm,ioc", &priv->ini.ioc);
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;
err = brcm_usb_phy_dvr_init(dev, priv, dn);
if (err)
return err;
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");
/* 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(priv->usb_20_clk);
clk_disable(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)
{
sysfs_remove_group(&pdev->dev.kobj, &brcm_usb_phy_group);
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) {
clk_disable(priv->usb_20_clk);
clk_disable(priv->usb_30_clk);
}
return 0;
}
static int brcm_usb_phy_resume(struct device *dev)
{
struct brcm_usb_phy_data *priv = dev_get_drvdata(dev);
clk_enable(priv->usb_20_clk);
clk_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) {
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(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(priv->usb_30_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(priv->usb_20_clk);
clk_disable(priv->usb_30_clk);
}
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)
};
static const struct of_device_id brcm_usb_dt_ids[] = {
{ .compatible = "brcm,brcmstb-usb-phy" },
{ /* sentinel */ }
};
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",
.owner = THIS_MODULE,
.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");