diff options
author | Kumaravel Thiagarajan <kumaravel.thiagarajan@microchip.com> | 2022-08-24 23:00:44 +0300 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-09-02 15:49:08 +0300 |
commit | 7d3e4d807df2a216b9aa2944372f2b3f6ef3f205 (patch) | |
tree | 0dad28c589e2b1ba1e7bd4b8ec3d5dfea5b1a079 /drivers/misc/mchp_pci1xxxx | |
parent | 393fc2f5948fd340d016a9557eea6e1ac2f6c60c (diff) | |
download | linux-7d3e4d807df2a216b9aa2944372f2b3f6ef3f205.tar.xz |
misc: microchip: pci1xxxx: load gpio driver for the gpio controller auxiliary device enumerated by the auxiliary bus driver.
PIO function's auxiliary bus driver enumerates separate child devices for
GPIO controller and OTP/EEPROM interface. This gpio driver implemented
based on the gpio framework is loaded for the gpio auxiliary device.
Signed-off-by: Kumaravel Thiagarajan <kumaravel.thiagarajan@microchip.com>
Link: https://lore.kernel.org/r/20220824200047.150308-3-kumaravel.thiagarajan@microchip.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc/mchp_pci1xxxx')
-rw-r--r-- | drivers/misc/mchp_pci1xxxx/Makefile | 2 | ||||
-rw-r--r-- | drivers/misc/mchp_pci1xxxx/mchp_pci1xxxx_gpio.c | 163 |
2 files changed, 164 insertions, 1 deletions
diff --git a/drivers/misc/mchp_pci1xxxx/Makefile b/drivers/misc/mchp_pci1xxxx/Makefile index 23927ab251c4..fc4615cfe28b 100644 --- a/drivers/misc/mchp_pci1xxxx/Makefile +++ b/drivers/misc/mchp_pci1xxxx/Makefile @@ -1 +1 @@ -obj-$(CONFIG_GP_PCI1XXXX) := mchp_pci1xxxx_gp.o +obj-$(CONFIG_GP_PCI1XXXX) := mchp_pci1xxxx_gp.o mchp_pci1xxxx_gpio.o diff --git a/drivers/misc/mchp_pci1xxxx/mchp_pci1xxxx_gpio.c b/drivers/misc/mchp_pci1xxxx/mchp_pci1xxxx_gpio.c new file mode 100644 index 000000000000..97ed7ae1baaa --- /dev/null +++ b/drivers/misc/mchp_pci1xxxx/mchp_pci1xxxx_gpio.c @@ -0,0 +1,163 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (C) 2022 Microchip Technology Inc. +// pci1xxxx gpio driver + +#include <linux/module.h> +#include <linux/spinlock.h> +#include <linux/gpio/driver.h> +#include <linux/bio.h> +#include <linux/spinlock.h> +#include <linux/mutex.h> +#include <linux/kthread.h> + +#include "mchp_pci1xxxx_gp.h" + +#define PCI1XXXX_NR_PINS 93 +#define PULLUP_OFFSET(x) ((((x) / 32) * 4) + 0x400 + 0x40) +#define PULLDOWN_OFFSET(x) ((((x) / 32) * 4) + 0x400 + 0x50) +#define OPENDRAIN_OFFSET(x) ((((x) / 32) * 4) + 0x400 + 0x60) +#define DEBOUNCE_OFFSET(x) ((((x) / 32) * 4) + 0x400 + 0xE0) +#define PIO_GLOBAL_CONFIG_OFFSET (0x400 + 0xF0) +#define PIO_PCI_CTRL_REG_OFFSET (0x400 + 0xF4) +#define INTR_MASK_OFFSET(x) ((((x) / 32) * 4) + 0x400 + 0x100) +#define INTR_STATUS_OFFSET(x) (((x) * 4) + 0x400 + 0xD0) + +struct pci1xxxx_gpio { + struct auxiliary_device *aux_dev; + void __iomem *reg_base; + struct gpio_chip gpio; + spinlock_t lock; + int irq_base; +}; + +static inline void pci1xxx_assign_bit(void __iomem *base_addr, unsigned int reg_offset, + unsigned int bitpos, bool set) +{ + u32 data; + + data = readl(base_addr + reg_offset); + if (set) + data |= BIT(bitpos); + else + data &= ~BIT(bitpos); + writel(data, base_addr + reg_offset); +} + +static int pci1xxxx_gpio_set_config(struct gpio_chip *gpio, unsigned int offset, + unsigned long config) +{ + struct pci1xxxx_gpio *priv = gpiochip_get_data(gpio); + unsigned long flags; + int ret = 0; + + spin_lock_irqsave(&priv->lock, flags); + switch (pinconf_to_config_param(config)) { + case PIN_CONFIG_BIAS_PULL_UP: + pci1xxx_assign_bit(priv->reg_base, PULLUP_OFFSET(offset), (offset % 32), true); + break; + case PIN_CONFIG_BIAS_PULL_DOWN: + pci1xxx_assign_bit(priv->reg_base, PULLDOWN_OFFSET(offset), (offset % 32), true); + break; + case PIN_CONFIG_BIAS_DISABLE: + pci1xxx_assign_bit(priv->reg_base, PULLUP_OFFSET(offset), (offset % 32), false); + pci1xxx_assign_bit(priv->reg_base, PULLDOWN_OFFSET(offset), (offset % 32), false); + break; + case PIN_CONFIG_DRIVE_OPEN_DRAIN: + pci1xxx_assign_bit(priv->reg_base, OPENDRAIN_OFFSET(offset), (offset % 32), true); + break; + default: + ret = -EOPNOTSUPP; + break; + } + spin_unlock_irqrestore(&priv->lock, flags); + + return ret; +} + +static int pci1xxxx_gpio_setup(struct pci1xxxx_gpio *priv, int irq) +{ + struct gpio_chip *gchip = &priv->gpio; + + gchip->label = dev_name(&priv->aux_dev->dev); + gchip->parent = &priv->aux_dev->dev; + gchip->owner = THIS_MODULE; + gchip->set_config = pci1xxxx_gpio_set_config; + gchip->dbg_show = NULL; + gchip->base = -1; + gchip->ngpio = PCI1XXXX_NR_PINS; + gchip->can_sleep = false; + + return 0; +} + +static int pci1xxxx_gpio_probe(struct auxiliary_device *aux_dev, + const struct auxiliary_device_id *id) + +{ + struct auxiliary_device_wrapper *aux_dev_wrapper; + struct gp_aux_data_type *pdata; + struct pci1xxxx_gpio *priv; + int retval; + + aux_dev_wrapper = (struct auxiliary_device_wrapper *) + container_of(aux_dev, struct auxiliary_device_wrapper, aux_dev); + + pdata = &aux_dev_wrapper->gp_aux_data; + + if (!pdata) + return -EINVAL; + + priv = devm_kzalloc(&aux_dev->dev, sizeof(struct pci1xxxx_gpio), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->aux_dev = aux_dev; + + if (!devm_request_mem_region(&aux_dev->dev, pdata->region_start, 0x800, aux_dev->name)) + return -EBUSY; + + priv->reg_base = devm_ioremap(&aux_dev->dev, pdata->region_start, 0x800); + if (!priv->reg_base) + return -ENOMEM; + + writel(0x0264, (priv->reg_base + 0x400 + 0xF0)); + + retval = pci1xxxx_gpio_setup(priv, pdata->irq_num); + + if (retval < 0) + return retval; + + dev_set_drvdata(&aux_dev->dev, priv); + + return devm_gpiochip_add_data(&aux_dev->dev, &priv->gpio, priv); +} + +const struct auxiliary_device_id pci1xxxx_gpio_auxiliary_id_table[] = { + {.name = "mchp_pci1xxxx_gp.gp_gpio"}, + {} +}; + +static struct auxiliary_driver pci1xxxx_gpio_driver = { + .driver = { + .name = "PCI1xxxxGPIO", + }, + .probe = pci1xxxx_gpio_probe, + .id_table = pci1xxxx_gpio_auxiliary_id_table +}; + +static int __init pci1xxxx_gpio_driver_init(void) +{ + return auxiliary_driver_register(&pci1xxxx_gpio_driver); +} + +static void __exit pci1xxxx_gpio_driver_exit(void) +{ + auxiliary_driver_unregister(&pci1xxxx_gpio_driver); +} + +module_init(pci1xxxx_gpio_driver_init); +module_exit(pci1xxxx_gpio_driver_exit); + +MODULE_DESCRIPTION("Microchip Technology Inc. PCI1xxxx GPIO controller"); +MODULE_AUTHOR("Kumaravel Thiagarajan <kumaravel.thiagarajan@microchip.com>"); +MODULE_LICENSE("GPL"); |