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