1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* ------------------------------------------------------------------------- */
3 /* i2c-elektor.c i2c-hw access for PCF8584 style isa bus adaptes             */
4 /* ------------------------------------------------------------------------- */
5 /*   Copyright (C) 1995-97 Simon G. Vogl
6                    1998-99 Hans Berglund
9 /* ------------------------------------------------------------------------- */
15    for Alpha Processor Inc. UP-2000(+) boards */
26 #include <linux/isa.h>
28 #include <linux/i2c-algo-pcf.h>
33 #include "../algos/i2c-algo-pcf.h"
37 static int base;  variable
45 /* vdovikin: removed static struct i2c_pcf_isa gpi; code -
47   in some functions, called from the algo-pcf module. Sometimes it's
48   need to be rewriten - but for now just remove this for simpler reading */
56 /* ----- local functions ----------------------------------------------	*/
136 		if (!request_region(base, 2, pcf_isa_ops.name)) {  in pcf_isa_init()
138 			       "in use\n", pcf_isa_ops.name, base);  in pcf_isa_init()
139 			return -ENODEV;  in pcf_isa_init()
141 		base_iomem = ioport_map(base, 2);  in pcf_isa_init()
144 			       pcf_isa_ops.name, base);  in pcf_isa_init()
145 			release_region(base, 2);  in pcf_isa_init()
146 			return -ENODEV;  in pcf_isa_init()
149 		if (!request_mem_region(base, 2, pcf_isa_ops.name)) {  in pcf_isa_init()
151 			       "is in use\n", pcf_isa_ops.name, base);  in pcf_isa_init()
152 			return -ENODEV;  in pcf_isa_init()
154 		base_iomem = ioremap(base, 2);  in pcf_isa_init()
157 			       "failed\n", pcf_isa_ops.name, base);  in pcf_isa_init()
158 			release_mem_region(base, 2);  in pcf_isa_init()
159 			return -ENODEV;  in pcf_isa_init()
162 	pr_debug("%s: registers %#x remapped to %p\n", pcf_isa_ops.name, base,  in pcf_isa_init()
177 /* ------------------------------------------------------------------------
193 	.name		= "i2c-elektor",
200 	Cypress cy82c693 PCI-ISA bridge as on UP2000 board */  in elektor_match()
201 	if (base == 0) {  in elektor_match()
226 					base = 0xe0000;  in elektor_match()
228 					/* UP2000 drives ISA with  in elektor_match()
243 	if (mmapped && base < 0xc8000) {  in elektor_match()
244 		dev_err(dev, "incorrect base address (%#x) specified "  in elektor_match()
245 		       "for mmapped I/O\n", base);  in elektor_match()
249 	if (base == 0) {  in elektor_match()
250 		base = DEFAULT_BASE;  in elektor_match()
259 		return -ENODEV;  in elektor_probe()
264 	dev_info(dev, "found device at %#x\n", base);  in elektor_probe()
276 		release_region(base, 2);  in elektor_probe()
279 		release_mem_region(base, 2);  in elektor_probe()
281 	return -ENODEV;  in elektor_probe()
295 		release_region(base, 2);  in elektor_remove()
298 		release_mem_region(base, 2);  in elektor_remove()
308 		.name	= "i2c-elektor",
313 MODULE_DESCRIPTION("I2C-Bus adapter routines for PCF8584 ISA bus adapter");
316 module_param_hw(base, int, ioport_or_iomem, 0);