102 lines
3.0 KiB
C
102 lines
3.0 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* GPIO driver for the Diamond Systems GPIO-MM
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* Copyright (C) 2016 William Breathitt Gray
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*
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* This driver supports the following Diamond Systems devices: GPIO-MM and
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* GPIO-MM-12.
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*/
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#include <linux/device.h>
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#include <linux/errno.h>
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#include <linux/ioport.h>
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#include <linux/isa.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/regmap.h>
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#include <linux/types.h>
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#include "gpio-i8255.h"
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MODULE_IMPORT_NS(I8255);
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#define GPIOMM_EXTENT 8
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#define MAX_NUM_GPIOMM max_num_isa_dev(GPIOMM_EXTENT)
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static unsigned int base[MAX_NUM_GPIOMM];
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static unsigned int num_gpiomm;
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module_param_hw_array(base, uint, ioport, &num_gpiomm, 0);
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MODULE_PARM_DESC(base, "Diamond Systems GPIO-MM base addresses");
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#define GPIOMM_NUM_PPI 2
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static const struct regmap_range gpiomm_volatile_ranges[] = {
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i8255_volatile_regmap_range(0x0), i8255_volatile_regmap_range(0x4),
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};
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static const struct regmap_access_table gpiomm_volatile_table = {
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.yes_ranges = gpiomm_volatile_ranges,
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.n_yes_ranges = ARRAY_SIZE(gpiomm_volatile_ranges),
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};
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static const struct regmap_config gpiomm_regmap_config = {
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.reg_bits = 8,
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.reg_stride = 1,
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.val_bits = 8,
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.io_port = true,
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.max_register = 0x7,
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.volatile_table = &gpiomm_volatile_table,
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.cache_type = REGCACHE_FLAT,
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};
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#define GPIOMM_NGPIO 48
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static const char *gpiomm_names[GPIOMM_NGPIO] = {
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"Port 1A0", "Port 1A1", "Port 1A2", "Port 1A3", "Port 1A4", "Port 1A5",
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"Port 1A6", "Port 1A7", "Port 1B0", "Port 1B1", "Port 1B2", "Port 1B3",
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"Port 1B4", "Port 1B5", "Port 1B6", "Port 1B7", "Port 1C0", "Port 1C1",
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"Port 1C2", "Port 1C3", "Port 1C4", "Port 1C5", "Port 1C6", "Port 1C7",
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"Port 2A0", "Port 2A1", "Port 2A2", "Port 2A3", "Port 2A4", "Port 2A5",
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"Port 2A6", "Port 2A7", "Port 2B0", "Port 2B1", "Port 2B2", "Port 2B3",
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"Port 2B4", "Port 2B5", "Port 2B6", "Port 2B7", "Port 2C0", "Port 2C1",
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"Port 2C2", "Port 2C3", "Port 2C4", "Port 2C5", "Port 2C6", "Port 2C7",
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};
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static int gpiomm_probe(struct device *dev, unsigned int id)
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{
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const char *const name = dev_name(dev);
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struct i8255_regmap_config config = {};
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void __iomem *regs;
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if (!devm_request_region(dev, base[id], GPIOMM_EXTENT, name)) {
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dev_err(dev, "Unable to lock port addresses (0x%X-0x%X)\n",
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base[id], base[id] + GPIOMM_EXTENT);
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return -EBUSY;
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}
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regs = devm_ioport_map(dev, base[id], GPIOMM_EXTENT);
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if (!regs)
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return -ENOMEM;
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config.map = devm_regmap_init_mmio(dev, regs, &gpiomm_regmap_config);
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if (IS_ERR(config.map))
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return dev_err_probe(dev, PTR_ERR(config.map),
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"Unable to initialize register map\n");
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config.parent = dev;
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config.num_ppi = GPIOMM_NUM_PPI;
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config.names = gpiomm_names;
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return devm_i8255_regmap_register(dev, &config);
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}
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static struct isa_driver gpiomm_driver = {
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.probe = gpiomm_probe,
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.driver = {
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.name = "gpio-mm"
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},
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};
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module_isa_driver(gpiomm_driver, num_gpiomm);
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MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@gmail.com>");
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MODULE_DESCRIPTION("Diamond Systems GPIO-MM GPIO driver");
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MODULE_LICENSE("GPL v2");
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