The output pins of the RZ/G2L general PWM timer (GPT) can be disabled
by using the port output enabling function for the GPT (POEG).
Add basic user control support to enable/disable output from GPT
by using poeg char device.
Signed-off-by: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
---
v6->v7:
* Used DT to handle the system configuration
* Added poeg char device for user control support to enable/disable
output from GPT
* Replaced iowrite32/ioread32-> writel/readl
* Dropped of_match_ptr from .of_match_table
v5->v6:
* Dropped sysfs and is handled in generic driver.
v4->v5:
* Updated kernel version in sysfs doc.
v3->v4:
* Updated commit description.
v2->v3:
* Added sysfs documentation for output_disable
* PWM_RZG2L_GPT implies ARCH_RZG2L. So removed ARCH_RZG2L dependency
* Used dev_get_drvdata to get device data
* Replaced sprintf->sysfs_emit in show().
v1->v2:
* Renamed the file poeg-rzg2l->rzg2l-poeg
* Removed the macro POEGG as there is only single register and
updated rzg2l_poeg_write() and rzg2l_poeg_read()
* Updated error handling in probe()
Ref->v1:
* Moved driver files from soc to pincontrol directory
* Updated KConfig
---
drivers/pinctrl/renesas/Kconfig | 2 +
drivers/pinctrl/renesas/Makefile | 2 +
drivers/pinctrl/renesas/poeg/Kconfig | 11 +
drivers/pinctrl/renesas/poeg/Makefile | 2 +
drivers/pinctrl/renesas/poeg/rzg2l-poeg.c | 299 ++++++++++++++++++++++
include/linux/pinctrl/rzg2l-poeg.h | 15 ++
6 files changed, 331 insertions(+)
create mode 100644 drivers/pinctrl/renesas/poeg/Kconfig
create mode 100644 drivers/pinctrl/renesas/poeg/Makefile
create mode 100644 drivers/pinctrl/renesas/poeg/rzg2l-poeg.c
create mode 100644 include/linux/pinctrl/rzg2l-poeg.h
diff --git a/drivers/pinctrl/renesas/Kconfig b/drivers/pinctrl/renesas/Kconfig
index 77730dc548ed..42e030ae2783 100644
--- a/drivers/pinctrl/renesas/Kconfig
+++ b/drivers/pinctrl/renesas/Kconfig
@@ -303,4 +303,6 @@ config PINCTRL_PFC_SHX3
bool "pin control support for SH-X3" if COMPILE_TEST
select PINCTRL_SH_FUNC_GPIO
+source "drivers/pinctrl/renesas/poeg/Kconfig"
+
endmenu
diff --git a/drivers/pinctrl/renesas/Makefile b/drivers/pinctrl/renesas/Makefile
index 3e776955bd4b..03338920725e 100644
--- a/drivers/pinctrl/renesas/Makefile
+++ b/drivers/pinctrl/renesas/Makefile
@@ -51,6 +51,8 @@ obj-$(CONFIG_PINCTRL_RZG2L) += pinctrl-rzg2l.o
obj-$(CONFIG_PINCTRL_RZN1) += pinctrl-rzn1.o
obj-$(CONFIG_PINCTRL_RZV2M) += pinctrl-rzv2m.o
+obj-$(CONFIG_POEG_RZG2L) += poeg/
+
ifeq ($(CONFIG_COMPILE_TEST),y)
CFLAGS_pfc-sh7203.o += -I$(srctree)/arch/sh/include/cpu-sh2a
CFLAGS_pfc-sh7264.o += -I$(srctree)/arch/sh/include/cpu-sh2a
diff --git a/drivers/pinctrl/renesas/poeg/Kconfig b/drivers/pinctrl/renesas/poeg/Kconfig
new file mode 100644
index 000000000000..306e8ae81cb2
--- /dev/null
+++ b/drivers/pinctrl/renesas/poeg/Kconfig
@@ -0,0 +1,11 @@
+# SPDX-License-Identifier: GPL-2.0
+config POEG_RZG2L
+ tristate "Renesas RZ/G2L poeg support"
+ depends on PWM_RZG2L_GPT || COMPILE_TEST
+ depends on HAS_IOMEM
+ help
+ This driver exposes the Port Output Enable for GPT(POEG) found
+ in Renesas RZ/G2L alike SoCs.
+
+ To compile this driver as a module, choose M here: the module
+ will be called rzg2l-poeg.
diff --git a/drivers/pinctrl/renesas/poeg/Makefile b/drivers/pinctrl/renesas/poeg/Makefile
new file mode 100644
index 000000000000..610bdd6182be
--- /dev/null
+++ b/drivers/pinctrl/renesas/poeg/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_POEG_RZG2L) += rzg2l-poeg.o
diff --git a/drivers/pinctrl/renesas/poeg/rzg2l-poeg.c b/drivers/pinctrl/renesas/poeg/rzg2l-poeg.c
new file mode 100644
index 000000000000..30e75954af76
--- /dev/null
+++ b/drivers/pinctrl/renesas/poeg/rzg2l-poeg.c
@@ -0,0 +1,299 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Renesas RZ/G2L Port Output Enable for GPT (POEG) driver
+ *
+ * Copyright (C) 2023 Renesas Electronics Corporation
+ */
+#include <linux/cdev.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/pinctrl/rzg2l-poeg.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/reset.h>
+
+#define POEGG_SSF BIT(3)
+
+#define RZG2L_POEG_MAX_INDEX 3
+
+#define RZG2L_GPT_MAX_HW_CHANNELS 8
+#define RZG2L_GPT_INVALID_CHANNEL 0xff
+
+enum poeg_conf {
+ POEG_USER_CTRL = BIT(0),
+ POEG_GPT_BOTH_HIGH = BIT(1),
+ POEG_GPT_BOTH_LOW = BIT(2),
+ POEG_GPT_DEAD_TIME = BIT(3),
+ POEG_EXT_PIN_CTRL = BIT(4),
+ POEG_GPT_BOTH_HIGH_LOW = BIT(1) | BIT(2),
+ POEG_GPT_BOTH_HIGH_DEAD_TIME = BIT(1) | BIT(3),
+ POEG_GPT_BOTH_LOW_DEAD_TIME = BIT(2) | BIT(3),
+ POEG_GPT_ALL = BIT(1) | BIT(2) | BIT(3)
+};
+
+static struct class *poeg_class;
+static dev_t g_poeg_dev;
+static int minor_n;
+
+struct rzg2l_poeg_chip {
+ struct device *gpt_dev;
+ struct reset_control *rstc;
+ void __iomem *mmio;
+ struct cdev poeg_cdev;
+ u8 gpt_channels[RZG2L_GPT_MAX_HW_CHANNELS];
+ u8 index;
+ u32 cfg;
+ int minor_n;
+};
+
+static void rzg2l_poeg_write(struct rzg2l_poeg_chip *chip, u32 data)
+{
+ writel(data, chip->mmio);
+}
+
+static u32 rzg2l_poeg_read(struct rzg2l_poeg_chip *chip)
+{
+ return readl(chip->mmio);
+}
+
+static int rzg2l_poeg_output_disable_user(struct rzg2l_poeg_chip *chip,
+ bool enable)
+{
+ u32 reg_val;
+
+ reg_val = rzg2l_poeg_read(chip);
+ if (enable)
+ reg_val |= POEGG_SSF;
+ else
+ reg_val &= ~POEGG_SSF;
+
+ rzg2l_poeg_write(chip, reg_val);
+
+ return 0;
+}
+
+static ssize_t rzg2l_poeg_chrdev_write(struct file *filp,
+ const char __user *buf,
+ size_t len, loff_t *f_ps)
+{
+ struct rzg2l_poeg_chip *const chip = filp->private_data;
+ struct poeg_cmd cmd;
+
+ if (copy_from_user(&cmd, buf, sizeof(cmd)))
+ return -EFAULT;
+
+ switch (cmd.val) {
+ case RZG2L_POEG_USR_CTRL_ENABLE_CMD:
+ rzg2l_poeg_output_disable_user(chip, true);
+ break;
+ case RZG2L_POEG_USR_CTRL_DISABLE_CMD:
+ rzg2l_poeg_output_disable_user(chip, false);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return len;
+}
+
+static int rzg2l_poeg_chrdev_open(struct inode *inode, struct file *filp)
+{
+ struct rzg2l_poeg_chip *const chip = container_of(inode->i_cdev,
+ typeof(*chip),
+ poeg_cdev);
+
+ filp->private_data = chip;
+
+ return nonseekable_open(inode, filp);
+}
+
+static int rzg2l_poeg_chrdev_release(struct inode *inode, struct file *filp)
+{
+ filp->private_data = NULL;
+
+ return 0;
+}
+
+static const struct file_operations poeg_fops = {
+ .owner = THIS_MODULE,
+ .write = rzg2l_poeg_chrdev_write,
+ .open = rzg2l_poeg_chrdev_open,
+ .release = rzg2l_poeg_chrdev_release,
+};
+
+static const struct of_device_id rzg2l_poeg_of_table[] = {
+ { .compatible = "renesas,rzg2l-poeg", },
+ { /* Sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, rzg2l_poeg_of_table);
+
+static void rzg2l_poeg_cleanup(void *data)
+{
+ struct rzg2l_poeg_chip *chip = data;
+
+ put_device(chip->gpt_dev);
+}
+
+static int rzg2l_poeg_probe(struct platform_device *pdev)
+{
+ struct platform_device *gpt_pdev = NULL;
+ struct rzg2l_poeg_chip *chip;
+ struct device_node *np;
+ struct device *cdev;
+ u32 cfg, val;
+ int ret;
+
+ chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
+ if (!chip)
+ return -ENOMEM;
+
+ if (!of_property_read_u32(pdev->dev.of_node, "renesas,poeg-id", &val))
+ chip->index = val;
+
+ if (chip->index > RZG2L_POEG_MAX_INDEX)
+ return -EINVAL;
+
+ np = of_parse_phandle(pdev->dev.of_node, "renesas,gpt", 0);
+ if (np)
+ gpt_pdev = of_find_device_by_node(np);
+
+ of_node_put(np);
+ if (!gpt_pdev)
+ return -ENODEV;
+
+ chip->gpt_dev = &gpt_pdev->dev;
+ ret = devm_add_action_or_reset(&pdev->dev, rzg2l_poeg_cleanup, chip);
+ if (ret < 0)
+ return ret;
+
+ chip->mmio = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(chip->mmio))
+ return PTR_ERR(chip->mmio);
+
+ chip->rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);
+ if (IS_ERR(chip->rstc))
+ return dev_err_probe(&pdev->dev, PTR_ERR(chip->rstc),
+ "get reset failed\n");
+
+ ret = reset_control_deassert(chip->rstc);
+ if (ret)
+ return ret;
+
+ platform_set_drvdata(pdev, chip);
+ pm_runtime_enable(&pdev->dev);
+ ret = pm_runtime_resume_and_get(&pdev->dev);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "pm_runtime_resume_get failed: %d\n", ret);
+ goto err_pm_disable;
+ }
+
+ if (!of_property_read_u32(pdev->dev.of_node, "renesas,poeg-config", &cfg)) {
+ switch (cfg) {
+ case POEG_USER_CTRL:
+ rzg2l_poeg_write(chip, POEGG_SSF);
+ break;
+ default:
+ ret = -EINVAL;
+ goto err_pm;
+ }
+
+ chip->cfg = cfg;
+
+ cdev_init(&chip->poeg_cdev, &poeg_fops);
+ chip->poeg_cdev.owner = THIS_MODULE;
+ ret = cdev_add(&chip->poeg_cdev, MKDEV(MAJOR(g_poeg_dev), minor_n), 1);
+ if (ret)
+ goto err_pm;
+
+ cdev = device_create(poeg_class, NULL,
+ MKDEV(MAJOR(g_poeg_dev), minor_n), NULL,
+ "poeg%d", minor_n);
+ if (IS_ERR(cdev)) {
+ ret = PTR_ERR(cdev);
+ dev_err(&pdev->dev,
+ "Error %d creating device for port %u\n",
+ ret, minor_n);
+ goto free_cdev;
+ }
+ chip->minor_n = minor_n;
+ }
+
+ minor_n++;
+
+ return ret;
+
+free_cdev:
+ cdev_del(&chip->poeg_cdev);
+err_pm:
+ pm_runtime_put(&pdev->dev);
+err_pm_disable:
+ pm_runtime_disable(&pdev->dev);
+ reset_control_assert(chip->rstc);
+ return ret;
+}
+
+static int rzg2l_poeg_remove(struct platform_device *pdev)
+{
+ struct rzg2l_poeg_chip *chip = platform_get_drvdata(pdev);
+
+ device_destroy(poeg_class, MKDEV(MAJOR(g_poeg_dev), chip->minor_n));
+ cdev_del(&chip->poeg_cdev);
+ pm_runtime_put(&pdev->dev);
+ pm_runtime_disable(&pdev->dev);
+ reset_control_assert(chip->rstc);
+
+ return 0;
+}
+
+static struct platform_driver rzg2l_poeg_driver = {
+ .driver = {
+ .name = "rzg2l-poeg",
+ .of_match_table = rzg2l_poeg_of_table
+ },
+ .probe = rzg2l_poeg_probe,
+ .remove = rzg2l_poeg_remove
+};
+
+static int rzg2l_poeg_device_init(void)
+{
+ int err;
+
+ err = alloc_chrdev_region(&g_poeg_dev, 0, 1, "poeg");
+ if (err)
+ goto out;
+
+ poeg_class = class_create("poeg");
+ if (IS_ERR(poeg_class)) {
+ err = PTR_ERR(poeg_class);
+ goto err_free_chrdev;
+ }
+
+ err = platform_driver_register(&rzg2l_poeg_driver);
+ if (err)
+ goto err_class_destroy;
+
+ return 0;
+
+err_class_destroy:
+ class_destroy(poeg_class);
+err_free_chrdev:
+ unregister_chrdev_region(g_poeg_dev, 1);
+out:
+ return err;
+}
+
+static void rzg2l_poeg_device_exit(void)
+{
+ platform_driver_unregister(&rzg2l_poeg_driver);
+ class_destroy(poeg_class);
+ unregister_chrdev_region(g_poeg_dev, 1);
+}
+
+module_init(rzg2l_poeg_device_init);
+module_exit(rzg2l_poeg_device_exit);
+
+MODULE_AUTHOR("Biju Das <biju.das.jz@xxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("Renesas RZ/G2L POEG Driver");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/pinctrl/rzg2l-poeg.h b/include/linux/pinctrl/rzg2l-poeg.h
new file mode 100644
index 000000000000..32e7d07fc00e
--- /dev/null
+++ b/include/linux/pinctrl/rzg2l-poeg.h
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __LINUX_POEG_RZG2L_H__
+#define __LINUX_POEG_RZG2L_H__
+
+#include <linux/types.h>
+
+#define RZG2L_POEG_USR_CTRL_ENABLE_CMD 0
+#define RZG2L_POEG_USR_CTRL_DISABLE_CMD 1
+
+struct poeg_cmd {
+ __u32 val;
+ __u8 channel;
+};
+
+#endif /* __LINUX_POEG_RZG2L_H__ */
--
2.25.1
