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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/usb/misc/qcom_eud.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/usb/misc/qcom_eud.c')
-rw-r--r--drivers/usb/misc/qcom_eud.c251
1 files changed, 251 insertions, 0 deletions
diff --git a/drivers/usb/misc/qcom_eud.c b/drivers/usb/misc/qcom_eud.c
new file mode 100644
index 000000000..b7f13df00
--- /dev/null
+++ b/drivers/usb/misc/qcom_eud.c
@@ -0,0 +1,251 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2015-2021, The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/bitops.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/sysfs.h>
+#include <linux/usb/role.h>
+
+#define EUD_REG_INT1_EN_MASK 0x0024
+#define EUD_REG_INT_STATUS_1 0x0044
+#define EUD_REG_CTL_OUT_1 0x0074
+#define EUD_REG_VBUS_INT_CLR 0x0080
+#define EUD_REG_CSR_EUD_EN 0x1014
+#define EUD_REG_SW_ATTACH_DET 0x1018
+#define EUD_REG_EUD_EN2 0x0000
+
+#define EUD_ENABLE BIT(0)
+#define EUD_INT_PET_EUD BIT(0)
+#define EUD_INT_VBUS BIT(2)
+#define EUD_INT_SAFE_MODE BIT(4)
+#define EUD_INT_ALL (EUD_INT_VBUS | EUD_INT_SAFE_MODE)
+
+struct eud_chip {
+ struct device *dev;
+ struct usb_role_switch *role_sw;
+ void __iomem *base;
+ void __iomem *mode_mgr;
+ unsigned int int_status;
+ int irq;
+ bool enabled;
+ bool usb_attached;
+};
+
+static int enable_eud(struct eud_chip *priv)
+{
+ writel(EUD_ENABLE, priv->base + EUD_REG_CSR_EUD_EN);
+ writel(EUD_INT_VBUS | EUD_INT_SAFE_MODE,
+ priv->base + EUD_REG_INT1_EN_MASK);
+ writel(1, priv->mode_mgr + EUD_REG_EUD_EN2);
+
+ return usb_role_switch_set_role(priv->role_sw, USB_ROLE_DEVICE);
+}
+
+static void disable_eud(struct eud_chip *priv)
+{
+ writel(0, priv->base + EUD_REG_CSR_EUD_EN);
+ writel(0, priv->mode_mgr + EUD_REG_EUD_EN2);
+}
+
+static ssize_t enable_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct eud_chip *chip = dev_get_drvdata(dev);
+
+ return sysfs_emit(buf, "%d\n", chip->enabled);
+}
+
+static ssize_t enable_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct eud_chip *chip = dev_get_drvdata(dev);
+ bool enable;
+ int ret;
+
+ if (kstrtobool(buf, &enable))
+ return -EINVAL;
+
+ if (enable) {
+ ret = enable_eud(chip);
+ if (!ret)
+ chip->enabled = enable;
+ else
+ disable_eud(chip);
+ } else {
+ disable_eud(chip);
+ }
+
+ return count;
+}
+
+static DEVICE_ATTR_RW(enable);
+
+static struct attribute *eud_attrs[] = {
+ &dev_attr_enable.attr,
+ NULL,
+};
+ATTRIBUTE_GROUPS(eud);
+
+static void usb_attach_detach(struct eud_chip *chip)
+{
+ u32 reg;
+
+ /* read ctl_out_1[4] to find USB attach or detach event */
+ reg = readl(chip->base + EUD_REG_CTL_OUT_1);
+ chip->usb_attached = reg & EUD_INT_SAFE_MODE;
+}
+
+static void pet_eud(struct eud_chip *chip)
+{
+ u32 reg;
+ int ret;
+
+ /* When the EUD_INT_PET_EUD in SW_ATTACH_DET is set, the cable has been
+ * disconnected and we need to detach the pet to check if EUD is in safe
+ * mode before attaching again.
+ */
+ reg = readl(chip->base + EUD_REG_SW_ATTACH_DET);
+ if (reg & EUD_INT_PET_EUD) {
+ /* Detach & Attach pet for EUD */
+ writel(0, chip->base + EUD_REG_SW_ATTACH_DET);
+ /* Delay to make sure detach pet is done before attach pet */
+ ret = readl_poll_timeout(chip->base + EUD_REG_SW_ATTACH_DET,
+ reg, (reg == 0), 1, 100);
+ if (ret) {
+ dev_err(chip->dev, "Detach pet failed\n");
+ return;
+ }
+ }
+ /* Attach pet for EUD */
+ writel(EUD_INT_PET_EUD, chip->base + EUD_REG_SW_ATTACH_DET);
+}
+
+static irqreturn_t handle_eud_irq(int irq, void *data)
+{
+ struct eud_chip *chip = data;
+ u32 reg;
+
+ reg = readl(chip->base + EUD_REG_INT_STATUS_1);
+ switch (reg & EUD_INT_ALL) {
+ case EUD_INT_VBUS:
+ usb_attach_detach(chip);
+ return IRQ_WAKE_THREAD;
+ case EUD_INT_SAFE_MODE:
+ pet_eud(chip);
+ return IRQ_HANDLED;
+ default:
+ return IRQ_NONE;
+ }
+}
+
+static irqreturn_t handle_eud_irq_thread(int irq, void *data)
+{
+ struct eud_chip *chip = data;
+ int ret;
+
+ if (chip->usb_attached)
+ ret = usb_role_switch_set_role(chip->role_sw, USB_ROLE_DEVICE);
+ else
+ ret = usb_role_switch_set_role(chip->role_sw, USB_ROLE_HOST);
+ if (ret)
+ dev_err(chip->dev, "failed to set role switch\n");
+
+ /* set and clear vbus_int_clr[0] to clear interrupt */
+ writel(BIT(0), chip->base + EUD_REG_VBUS_INT_CLR);
+ writel(0, chip->base + EUD_REG_VBUS_INT_CLR);
+
+ return IRQ_HANDLED;
+}
+
+static void eud_role_switch_release(void *data)
+{
+ struct eud_chip *chip = data;
+
+ usb_role_switch_put(chip->role_sw);
+}
+
+static int eud_probe(struct platform_device *pdev)
+{
+ struct eud_chip *chip;
+ int ret;
+
+ chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
+ if (!chip)
+ return -ENOMEM;
+
+ chip->dev = &pdev->dev;
+
+ chip->role_sw = usb_role_switch_get(&pdev->dev);
+ if (IS_ERR(chip->role_sw))
+ return dev_err_probe(chip->dev, PTR_ERR(chip->role_sw),
+ "failed to get role switch\n");
+
+ ret = devm_add_action_or_reset(chip->dev, eud_role_switch_release, chip);
+ if (ret)
+ return dev_err_probe(chip->dev, ret,
+ "failed to add role switch release action\n");
+
+ chip->base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(chip->base))
+ return PTR_ERR(chip->base);
+
+ chip->mode_mgr = devm_platform_ioremap_resource(pdev, 1);
+ if (IS_ERR(chip->mode_mgr))
+ return PTR_ERR(chip->mode_mgr);
+
+ chip->irq = platform_get_irq(pdev, 0);
+ ret = devm_request_threaded_irq(&pdev->dev, chip->irq, handle_eud_irq,
+ handle_eud_irq_thread, IRQF_ONESHOT, NULL, chip);
+ if (ret)
+ return dev_err_probe(chip->dev, ret, "failed to allocate irq\n");
+
+ enable_irq_wake(chip->irq);
+
+ platform_set_drvdata(pdev, chip);
+
+ return 0;
+}
+
+static int eud_remove(struct platform_device *pdev)
+{
+ struct eud_chip *chip = platform_get_drvdata(pdev);
+
+ if (chip->enabled)
+ disable_eud(chip);
+
+ device_init_wakeup(&pdev->dev, false);
+ disable_irq_wake(chip->irq);
+
+ return 0;
+}
+
+static const struct of_device_id eud_dt_match[] = {
+ { .compatible = "qcom,sc7280-eud" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, eud_dt_match);
+
+static struct platform_driver eud_driver = {
+ .probe = eud_probe,
+ .remove = eud_remove,
+ .driver = {
+ .name = "qcom_eud",
+ .dev_groups = eud_groups,
+ .of_match_table = eud_dt_match,
+ },
+};
+module_platform_driver(eud_driver);
+
+MODULE_DESCRIPTION("QTI EUD driver");
+MODULE_LICENSE("GPL v2");