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path: root/drivers/phy/broadcom/phy-brcm-usb.c
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Diffstat (limited to 'drivers/phy/broadcom/phy-brcm-usb.c')
-rw-r--r--drivers/phy/broadcom/phy-brcm-usb.c459
1 files changed, 459 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 000000000000..195b98139e5f
--- /dev/null
+++ b/drivers/phy/broadcom/phy-brcm-usb.c
@@ -0,0 +1,459 @@
+/*
+ * 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;
+}
+
+#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,
+ .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");