Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
William Breathitt Gray | 1585 | 93.73% | 13 | 61.90% |
Linus Walleij | 73 | 4.32% | 1 | 4.76% |
Matti Vaittinen | 8 | 0.47% | 1 | 4.76% |
Julia Cartwright | 7 | 0.41% | 1 | 4.76% |
David Howells | 6 | 0.35% | 1 | 4.76% |
Barney Goette | 6 | 0.35% | 1 | 4.76% |
Thierry Reding | 3 | 0.18% | 1 | 4.76% |
Thomas Gleixner | 2 | 0.12% | 1 | 4.76% |
Marc Zyngier | 1 | 0.06% | 1 | 4.76% |
Total | 1691 | 21 |
// SPDX-License-Identifier: GPL-2.0-only /* * GPIO driver for the ACCES 104-DIO-48E series * Copyright (C) 2016 William Breathitt Gray * * This driver supports the following ACCES devices: 104-DIO-48E and * 104-DIO-24E. */ #include <linux/bits.h> #include <linux/device.h> #include <linux/errno.h> #include <linux/gpio/driver.h> #include <linux/io.h> #include <linux/ioport.h> #include <linux/interrupt.h> #include <linux/irqdesc.h> #include <linux/isa.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/spinlock.h> #include <linux/types.h> #include "gpio-i8255.h" MODULE_IMPORT_NS(I8255); #define DIO48E_EXTENT 16 #define MAX_NUM_DIO48E max_num_isa_dev(DIO48E_EXTENT) static unsigned int base[MAX_NUM_DIO48E]; static unsigned int num_dio48e; module_param_hw_array(base, uint, ioport, &num_dio48e, 0); MODULE_PARM_DESC(base, "ACCES 104-DIO-48E base addresses"); static unsigned int irq[MAX_NUM_DIO48E]; static unsigned int num_irq; module_param_hw_array(irq, uint, irq, &num_irq, 0); MODULE_PARM_DESC(irq, "ACCES 104-DIO-48E interrupt line numbers"); #define DIO48E_NUM_PPI 2 /** * struct dio48e_reg - device register structure * @ppi: Programmable Peripheral Interface groups * @enable_buffer: Enable/Disable Buffer groups * @unused1: Unused * @enable_interrupt: Write: Enable Interrupt * Read: Disable Interrupt * @unused2: Unused * @enable_counter: Write: Enable Counter/Timer Addressing * Read: Disable Counter/Timer Addressing * @unused3: Unused * @clear_interrupt: Clear Interrupt */ struct dio48e_reg { struct i8255 ppi[DIO48E_NUM_PPI]; u8 enable_buffer[DIO48E_NUM_PPI]; u8 unused1; u8 enable_interrupt; u8 unused2; u8 enable_counter; u8 unused3; u8 clear_interrupt; }; /** * struct dio48e_gpio - GPIO device private data structure * @chip: instance of the gpio_chip * @ppi_state: PPI device states * @lock: synchronization lock to prevent I/O race conditions * @reg: I/O address offset for the device registers * @irq_mask: I/O bits affected by interrupts */ struct dio48e_gpio { struct gpio_chip chip; struct i8255_state ppi_state[DIO48E_NUM_PPI]; raw_spinlock_t lock; struct dio48e_reg __iomem *reg; unsigned char irq_mask; }; static int dio48e_gpio_get_direction(struct gpio_chip *chip, unsigned int offset) { struct dio48e_gpio *const dio48egpio = gpiochip_get_data(chip); if (i8255_get_direction(dio48egpio->ppi_state, offset)) return GPIO_LINE_DIRECTION_IN; return GPIO_LINE_DIRECTION_OUT; } static int dio48e_gpio_direction_input(struct gpio_chip *chip, unsigned int offset) { struct dio48e_gpio *const dio48egpio = gpiochip_get_data(chip); i8255_direction_input(dio48egpio->reg->ppi, dio48egpio->ppi_state, offset); return 0; } static int dio48e_gpio_direction_output(struct gpio_chip *chip, unsigned int offset, int value) { struct dio48e_gpio *const dio48egpio = gpiochip_get_data(chip); i8255_direction_output(dio48egpio->reg->ppi, dio48egpio->ppi_state, offset, value); return 0; } static int dio48e_gpio_get(struct gpio_chip *chip, unsigned int offset) { struct dio48e_gpio *const dio48egpio = gpiochip_get_data(chip); return i8255_get(dio48egpio->reg->ppi, offset); } static int dio48e_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask, unsigned long *bits) { struct dio48e_gpio *const dio48egpio = gpiochip_get_data(chip); i8255_get_multiple(dio48egpio->reg->ppi, mask, bits, chip->ngpio); return 0; } static void dio48e_gpio_set(struct gpio_chip *chip, unsigned int offset, int value) { struct dio48e_gpio *const dio48egpio = gpiochip_get_data(chip); i8255_set(dio48egpio->reg->ppi, dio48egpio->ppi_state, offset, value); } static void dio48e_gpio_set_multiple(struct gpio_chip *chip, unsigned long *mask, unsigned long *bits) { struct dio48e_gpio *const dio48egpio = gpiochip_get_data(chip); i8255_set_multiple(dio48egpio->reg->ppi, dio48egpio->ppi_state, mask, bits, chip->ngpio); } static void dio48e_irq_ack(struct irq_data *data) { } static void dio48e_irq_mask(struct irq_data *data) { struct gpio_chip *chip = irq_data_get_irq_chip_data(data); struct dio48e_gpio *const dio48egpio = gpiochip_get_data(chip); const unsigned long offset = irqd_to_hwirq(data); unsigned long flags; /* only bit 3 on each respective Port C supports interrupts */ if (offset != 19 && offset != 43) return; raw_spin_lock_irqsave(&dio48egpio->lock, flags); if (offset == 19) dio48egpio->irq_mask &= ~BIT(0); else dio48egpio->irq_mask &= ~BIT(1); gpiochip_disable_irq(chip, offset); if (!dio48egpio->irq_mask) /* disable interrupts */ ioread8(&dio48egpio->reg->enable_interrupt); raw_spin_unlock_irqrestore(&dio48egpio->lock, flags); } static void dio48e_irq_unmask(struct irq_data *data) { struct gpio_chip *chip = irq_data_get_irq_chip_data(data); struct dio48e_gpio *const dio48egpio = gpiochip_get_data(chip); const unsigned long offset = irqd_to_hwirq(data); unsigned long flags; /* only bit 3 on each respective Port C supports interrupts */ if (offset != 19 && offset != 43) return; raw_spin_lock_irqsave(&dio48egpio->lock, flags); if (!dio48egpio->irq_mask) { /* enable interrupts */ iowrite8(0x00, &dio48egpio->reg->clear_interrupt); iowrite8(0x00, &dio48egpio->reg->enable_interrupt); } gpiochip_enable_irq(chip, offset); if (offset == 19) dio48egpio->irq_mask |= BIT(0); else dio48egpio->irq_mask |= BIT(1); raw_spin_unlock_irqrestore(&dio48egpio->lock, flags); } static int dio48e_irq_set_type(struct irq_data *data, unsigned int flow_type) { const unsigned long offset = irqd_to_hwirq(data); /* only bit 3 on each respective Port C supports interrupts */ if (offset != 19 && offset != 43) return -EINVAL; if (flow_type != IRQ_TYPE_NONE && flow_type != IRQ_TYPE_EDGE_RISING) return -EINVAL; return 0; } static const struct irq_chip dio48e_irqchip = { .name = "104-dio-48e", .irq_ack = dio48e_irq_ack, .irq_mask = dio48e_irq_mask, .irq_unmask = dio48e_irq_unmask, .irq_set_type = dio48e_irq_set_type, .flags = IRQCHIP_IMMUTABLE, GPIOCHIP_IRQ_RESOURCE_HELPERS, }; static irqreturn_t dio48e_irq_handler(int irq, void *dev_id) { struct dio48e_gpio *const dio48egpio = dev_id; struct gpio_chip *const chip = &dio48egpio->chip; const unsigned long irq_mask = dio48egpio->irq_mask; unsigned long gpio; for_each_set_bit(gpio, &irq_mask, 2) generic_handle_domain_irq(chip->irq.domain, 19 + gpio*24); raw_spin_lock(&dio48egpio->lock); iowrite8(0x00, &dio48egpio->reg->clear_interrupt); raw_spin_unlock(&dio48egpio->lock); return IRQ_HANDLED; } #define DIO48E_NGPIO 48 static const char *dio48e_names[DIO48E_NGPIO] = { "PPI Group 0 Port A 0", "PPI Group 0 Port A 1", "PPI Group 0 Port A 2", "PPI Group 0 Port A 3", "PPI Group 0 Port A 4", "PPI Group 0 Port A 5", "PPI Group 0 Port A 6", "PPI Group 0 Port A 7", "PPI Group 0 Port B 0", "PPI Group 0 Port B 1", "PPI Group 0 Port B 2", "PPI Group 0 Port B 3", "PPI Group 0 Port B 4", "PPI Group 0 Port B 5", "PPI Group 0 Port B 6", "PPI Group 0 Port B 7", "PPI Group 0 Port C 0", "PPI Group 0 Port C 1", "PPI Group 0 Port C 2", "PPI Group 0 Port C 3", "PPI Group 0 Port C 4", "PPI Group 0 Port C 5", "PPI Group 0 Port C 6", "PPI Group 0 Port C 7", "PPI Group 1 Port A 0", "PPI Group 1 Port A 1", "PPI Group 1 Port A 2", "PPI Group 1 Port A 3", "PPI Group 1 Port A 4", "PPI Group 1 Port A 5", "PPI Group 1 Port A 6", "PPI Group 1 Port A 7", "PPI Group 1 Port B 0", "PPI Group 1 Port B 1", "PPI Group 1 Port B 2", "PPI Group 1 Port B 3", "PPI Group 1 Port B 4", "PPI Group 1 Port B 5", "PPI Group 1 Port B 6", "PPI Group 1 Port B 7", "PPI Group 1 Port C 0", "PPI Group 1 Port C 1", "PPI Group 1 Port C 2", "PPI Group 1 Port C 3", "PPI Group 1 Port C 4", "PPI Group 1 Port C 5", "PPI Group 1 Port C 6", "PPI Group 1 Port C 7" }; static int dio48e_irq_init_hw(struct gpio_chip *gc) { struct dio48e_gpio *const dio48egpio = gpiochip_get_data(gc); /* Disable IRQ by default */ ioread8(&dio48egpio->reg->enable_interrupt); return 0; } static void dio48e_init_ppi(struct i8255 __iomem *const ppi, struct i8255_state *const ppi_state) { const unsigned long ngpio = 24; const unsigned long mask = GENMASK(ngpio - 1, 0); const unsigned long bits = 0; unsigned long i; /* Initialize all GPIO to output 0 */ for (i = 0; i < DIO48E_NUM_PPI; i++) { i8255_mode0_output(&ppi[i]); i8255_set_multiple(&ppi[i], &ppi_state[i], &mask, &bits, ngpio); } } static int dio48e_probe(struct device *dev, unsigned int id) { struct dio48e_gpio *dio48egpio; const char *const name = dev_name(dev); struct gpio_irq_chip *girq; int err; dio48egpio = devm_kzalloc(dev, sizeof(*dio48egpio), GFP_KERNEL); if (!dio48egpio) return -ENOMEM; if (!devm_request_region(dev, base[id], DIO48E_EXTENT, name)) { dev_err(dev, "Unable to lock port addresses (0x%X-0x%X)\n", base[id], base[id] + DIO48E_EXTENT); return -EBUSY; } dio48egpio->reg = devm_ioport_map(dev, base[id], DIO48E_EXTENT); if (!dio48egpio->reg) return -ENOMEM; dio48egpio->chip.label = name; dio48egpio->chip.parent = dev; dio48egpio->chip.owner = THIS_MODULE; dio48egpio->chip.base = -1; dio48egpio->chip.ngpio = DIO48E_NGPIO; dio48egpio->chip.names = dio48e_names; dio48egpio->chip.get_direction = dio48e_gpio_get_direction; dio48egpio->chip.direction_input = dio48e_gpio_direction_input; dio48egpio->chip.direction_output = dio48e_gpio_direction_output; dio48egpio->chip.get = dio48e_gpio_get; dio48egpio->chip.get_multiple = dio48e_gpio_get_multiple; dio48egpio->chip.set = dio48e_gpio_set; dio48egpio->chip.set_multiple = dio48e_gpio_set_multiple; girq = &dio48egpio->chip.irq; gpio_irq_chip_set_chip(girq, &dio48e_irqchip); /* This will let us handle the parent IRQ in the driver */ girq->parent_handler = NULL; girq->num_parents = 0; girq->parents = NULL; girq->default_type = IRQ_TYPE_NONE; girq->handler = handle_edge_irq; girq->init_hw = dio48e_irq_init_hw; raw_spin_lock_init(&dio48egpio->lock); i8255_state_init(dio48egpio->ppi_state, DIO48E_NUM_PPI); dio48e_init_ppi(dio48egpio->reg->ppi, dio48egpio->ppi_state); err = devm_gpiochip_add_data(dev, &dio48egpio->chip, dio48egpio); if (err) { dev_err(dev, "GPIO registering failed (%d)\n", err); return err; } err = devm_request_irq(dev, irq[id], dio48e_irq_handler, 0, name, dio48egpio); if (err) { dev_err(dev, "IRQ handler registering failed (%d)\n", err); return err; } return 0; } static struct isa_driver dio48e_driver = { .probe = dio48e_probe, .driver = { .name = "104-dio-48e" }, }; module_isa_driver_with_irq(dio48e_driver, num_dio48e, num_irq); MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@gmail.com>"); MODULE_DESCRIPTION("ACCES 104-DIO-48E GPIO driver"); MODULE_LICENSE("GPL v2");
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with Cregit http://github.com/cregit/cregit
Version 2.0-RC1