1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * GPIO driver for the ACCES 104-IDIO-16 family
  4 * Copyright (C) 2015 William Breathitt Gray
  5 *
  6 * This driver supports the following ACCES devices: 104-IDIO-16,
  7 * 104-IDIO-16E, 104-IDO-16, 104-IDIO-8, 104-IDIO-8E, and 104-IDO-8.
  8 */
  9#include <linux/bits.h>
 10#include <linux/device.h>
 11#include <linux/err.h>
 12#include <linux/ioport.h>
 13#include <linux/irq.h>
 14#include <linux/isa.h>
 15#include <linux/kernel.h>
 16#include <linux/module.h>
 17#include <linux/moduleparam.h>
 18#include <linux/regmap.h>
 19#include <linux/types.h>
 20
 21#include "gpio-idio-16.h"
 22
 23#define IDIO_16_EXTENT 8
 24#define MAX_NUM_IDIO_16 max_num_isa_dev(IDIO_16_EXTENT)
 25
 26static unsigned int base[MAX_NUM_IDIO_16];
 27static unsigned int num_idio_16;
 28module_param_hw_array(base, uint, ioport, &num_idio_16, 0);
 29MODULE_PARM_DESC(base, "ACCES 104-IDIO-16 base addresses");
 30
 31static unsigned int irq[MAX_NUM_IDIO_16];
 32static unsigned int num_irq;
 33module_param_hw_array(irq, uint, irq, &num_irq, 0);
 34MODULE_PARM_DESC(irq, "ACCES 104-IDIO-16 interrupt line numbers");
 35
 36static const struct regmap_range idio_16_wr_ranges[] = {
 37	regmap_reg_range(0x0, 0x2), regmap_reg_range(0x4, 0x4),
 38};
 39static const struct regmap_range idio_16_rd_ranges[] = {
 40	regmap_reg_range(0x1, 0x2), regmap_reg_range(0x5, 0x5),
 41};
 42static const struct regmap_range idio_16_precious_ranges[] = {
 43	regmap_reg_range(0x2, 0x2),
 44};
 45static const struct regmap_access_table idio_16_wr_table = {
 46	.yes_ranges = idio_16_wr_ranges,
 47	.n_yes_ranges = ARRAY_SIZE(idio_16_wr_ranges),
 48};
 49static const struct regmap_access_table idio_16_rd_table = {
 50	.yes_ranges = idio_16_rd_ranges,
 51	.n_yes_ranges = ARRAY_SIZE(idio_16_rd_ranges),
 52};
 53static const struct regmap_access_table idio_16_precious_table = {
 54	.yes_ranges = idio_16_precious_ranges,
 55	.n_yes_ranges = ARRAY_SIZE(idio_16_precious_ranges),
 56};
 57static const struct regmap_config idio_16_regmap_config = {
 58	.reg_bits = 8,
 59	.reg_stride = 1,
 60	.val_bits = 8,
 61	.io_port = true,
 62	.wr_table = &idio_16_wr_table,
 63	.rd_table = &idio_16_rd_table,
 64	.volatile_table = &idio_16_rd_table,
 65	.precious_table = &idio_16_precious_table,
 66	.cache_type = REGCACHE_FLAT,
 67	.use_raw_spinlock = true,
 68};
 69
 70/* Only input lines (GPIO 16-31) support interrupts */
 71#define IDIO_16_REGMAP_IRQ(_id)						\
 72	[16 + _id] = {							\
 73		.mask = BIT(_id),					\
 74		.type = { .types_supported = IRQ_TYPE_EDGE_BOTH },	\
 75	}
 76
 77static const struct regmap_irq idio_16_regmap_irqs[] = {
 78	IDIO_16_REGMAP_IRQ(0), IDIO_16_REGMAP_IRQ(1), IDIO_16_REGMAP_IRQ(2), /* 0-2 */
 79	IDIO_16_REGMAP_IRQ(3), IDIO_16_REGMAP_IRQ(4), IDIO_16_REGMAP_IRQ(5), /* 3-5 */
 80	IDIO_16_REGMAP_IRQ(6), IDIO_16_REGMAP_IRQ(7), IDIO_16_REGMAP_IRQ(8), /* 6-8 */
 81	IDIO_16_REGMAP_IRQ(9), IDIO_16_REGMAP_IRQ(10), IDIO_16_REGMAP_IRQ(11), /* 9-11 */
 82	IDIO_16_REGMAP_IRQ(12), IDIO_16_REGMAP_IRQ(13), IDIO_16_REGMAP_IRQ(14), /* 12-14 */
 83	IDIO_16_REGMAP_IRQ(15), /* 15 */
 84};
 85
 86static int idio_16_probe(struct device *dev, unsigned int id)
 87{
 88	const char *const name = dev_name(dev);
 89	struct idio_16_regmap_config config = {};
 90	void __iomem *regs;
 91	struct regmap *map;
 92
 93	if (!devm_request_region(dev, base[id], IDIO_16_EXTENT, name)) {
 94		dev_err(dev, "Unable to lock port addresses (0x%X-0x%X)\n",
 95			base[id], base[id] + IDIO_16_EXTENT);
 96		return -EBUSY;
 97	}
 98
 99	regs = devm_ioport_map(dev, base[id], IDIO_16_EXTENT);
100	if (!regs)
101		return -ENOMEM;
102
103	map = devm_regmap_init_mmio(dev, regs, &idio_16_regmap_config);
104	if (IS_ERR(map))
105		return dev_err_probe(dev, PTR_ERR(map), "Unable to initialize register map\n");
106
107	config.parent = dev;
108	config.map = map;
109	config.regmap_irqs = idio_16_regmap_irqs;
110	config.num_regmap_irqs = ARRAY_SIZE(idio_16_regmap_irqs);
111	config.irq = irq[id];
112	config.no_status = true;
113
114	return devm_idio_16_regmap_register(dev, &config);
115}
116
117static struct isa_driver idio_16_driver = {
118	.probe = idio_16_probe,
119	.driver = {
120		.name = "104-idio-16"
121	},
122};
123
124module_isa_driver_with_irq(idio_16_driver, num_idio_16, num_irq);
125
126MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@gmail.com>");
127MODULE_DESCRIPTION("ACCES 104-IDIO-16 GPIO driver");
128MODULE_LICENSE("GPL v2");
129MODULE_IMPORT_NS("GPIO_IDIO_16");