1 files changed, 101 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-gpio-mm.c b/drivers/gpio/gpio-gpio-mm.c
new file mode 100644
index 0000000000..43d823a56e
--- /dev/null
+++ b/drivers/gpio/gpio-gpio-mm.c
@@ -0,0 +1,101 @@
+// 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");