diff options
Diffstat (limited to 'drivers/phy/broadcom/phy-brcm-usb.c')
| -rw-r--r-- | drivers/phy/broadcom/phy-brcm-usb.c | 467 |
1 files changed, 467 insertions, 0 deletions
diff --git a/drivers/phy/broadcom/phy-brcm-usb.c b/drivers/phy/broadcom/phy-brcm-usb.c new file mode 100644 index 000000000..e2455ffb8 --- /dev/null +++ b/drivers/phy/broadcom/phy-brcm-usb.c @@ -0,0 +1,467 @@ +/* + * 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); + if (IS_ERR(phy_provider)) + return PTR_ERR(phy_provider); + + return 0; +} + +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"); |