mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-16 07:24:39 +08:00
1c05004f99
The regmap API supports IO port accessors so we can take advantage of regmap abstractions rather than handling access to the device registers directly in the driver. The gpio-mm module is migrated to the new i8255 library interface leveraging the gpio-regmap API. Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: William Breathitt Gray <william.gray@linaro.org> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
102 lines
3.0 KiB
C
102 lines
3.0 KiB
C
// 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 <vilhelm.gray@gmail.com>");
|
|
MODULE_DESCRIPTION("Diamond Systems GPIO-MM GPIO driver");
|
|
MODULE_LICENSE("GPL v2");
|