1/*
2 * RapidIO sysfs attributes and support
3 *
4 * Copyright 2005 MontaVista Software, Inc.
5 * Matt Porter <mporter@kernel.crashing.org>
6 *
7 * This program is free software; you can redistribute  it and/or modify it
8 * under  the terms of  the GNU General  Public License as published by the
9 * Free Software Foundation;  either version 2 of the  License, or (at your
10 * option) any later version.
11 */
12
13#include <linux/kernel.h>
14#include <linux/rio.h>
15#include <linux/rio_drv.h>
16#include <linux/stat.h>
17
18#include "rio.h"
19
20/* Sysfs support */
21#define rio_config_attr(field, format_string)					\
22static ssize_t								\
23field##_show(struct device *dev, struct device_attribute *attr, char *buf)			\
24{									\
25	struct rio_dev *rdev = to_rio_dev(dev);				\
26									\
27	return sprintf(buf, format_string, rdev->field);		\
28}									\
29
30rio_config_attr(did, "0x%04x\n");
31rio_config_attr(vid, "0x%04x\n");
32rio_config_attr(device_rev, "0x%08x\n");
33rio_config_attr(asm_did, "0x%04x\n");
34rio_config_attr(asm_vid, "0x%04x\n");
35rio_config_attr(asm_rev, "0x%04x\n");
36
37static ssize_t routes_show(struct device *dev, struct device_attribute *attr, char *buf)
38{
39	struct rio_dev *rdev = to_rio_dev(dev);
40	char *str = buf;
41	int i;
42
43	if (!rdev->rswitch)
44		goto out;
45
46	for (i = 0; i < RIO_MAX_ROUTE_ENTRIES; i++) {
47		if (rdev->rswitch->route_table[i] == RIO_INVALID_ROUTE)
48			continue;
49		str +=
50		    sprintf(str, "%04x %02x\n", i,
51			    rdev->rswitch->route_table[i]);
52	}
53
54      out:
55	return (str - buf);
56}
57
58struct device_attribute rio_dev_attrs[] = {
59	__ATTR_RO(did),
60	__ATTR_RO(vid),
61	__ATTR_RO(device_rev),
62	__ATTR_RO(asm_did),
63	__ATTR_RO(asm_vid),
64	__ATTR_RO(asm_rev),
65	__ATTR_RO(routes),
66	__ATTR_NULL,
67};
68
69static ssize_t
70rio_read_config(struct kobject *kobj, char *buf, loff_t off, size_t count)
71{
72	struct rio_dev *dev =
73	    to_rio_dev(container_of(kobj, struct device, kobj));
74	unsigned int size = 0x100;
75	loff_t init_off = off;
76	u8 *data = (u8 *) buf;
77
78	/* Several chips lock up trying to read undefined config space */
79	if (capable(CAP_SYS_ADMIN))
80		size = 0x200000;
81
82	if (off > size)
83		return 0;
84	if (off + count > size) {
85		size -= off;
86		count = size;
87	} else {
88		size = count;
89	}
90
91	if ((off & 1) && size) {
92		u8 val;
93		rio_read_config_8(dev, off, &val);
94		data[off - init_off] = val;
95		off++;
96		size--;
97	}
98
99	if ((off & 3) && size > 2) {
100		u16 val;
101		rio_read_config_16(dev, off, &val);
102		data[off - init_off] = (val >> 8) & 0xff;
103		data[off - init_off + 1] = val & 0xff;
104		off += 2;
105		size -= 2;
106	}
107
108	while (size > 3) {
109		u32 val;
110		rio_read_config_32(dev, off, &val);
111		data[off - init_off] = (val >> 24) & 0xff;
112		data[off - init_off + 1] = (val >> 16) & 0xff;
113		data[off - init_off + 2] = (val >> 8) & 0xff;
114		data[off - init_off + 3] = val & 0xff;
115		off += 4;
116		size -= 4;
117	}
118
119	if (size >= 2) {
120		u16 val;
121		rio_read_config_16(dev, off, &val);
122		data[off - init_off] = (val >> 8) & 0xff;
123		data[off - init_off + 1] = val & 0xff;
124		off += 2;
125		size -= 2;
126	}
127
128	if (size > 0) {
129		u8 val;
130		rio_read_config_8(dev, off, &val);
131		data[off - init_off] = val;
132		off++;
133		--size;
134	}
135
136	return count;
137}
138
139static ssize_t
140rio_write_config(struct kobject *kobj, char *buf, loff_t off, size_t count)
141{
142	struct rio_dev *dev =
143	    to_rio_dev(container_of(kobj, struct device, kobj));
144	unsigned int size = count;
145	loff_t init_off = off;
146	u8 *data = (u8 *) buf;
147
148	if (off > 0x200000)
149		return 0;
150	if (off + count > 0x200000) {
151		size = 0x200000 - off;
152		count = size;
153	}
154
155	if ((off & 1) && size) {
156		rio_write_config_8(dev, off, data[off - init_off]);
157		off++;
158		size--;
159	}
160
161	if ((off & 3) && (size > 2)) {
162		u16 val = data[off - init_off + 1];
163		val |= (u16) data[off - init_off] << 8;
164		rio_write_config_16(dev, off, val);
165		off += 2;
166		size -= 2;
167	}
168
169	while (size > 3) {
170		u32 val = data[off - init_off + 3];
171		val |= (u32) data[off - init_off + 2] << 8;
172		val |= (u32) data[off - init_off + 1] << 16;
173		val |= (u32) data[off - init_off] << 24;
174		rio_write_config_32(dev, off, val);
175		off += 4;
176		size -= 4;
177	}
178
179	if (size >= 2) {
180		u16 val = data[off - init_off + 1];
181		val |= (u16) data[off - init_off] << 8;
182		rio_write_config_16(dev, off, val);
183		off += 2;
184		size -= 2;
185	}
186
187	if (size) {
188		rio_write_config_8(dev, off, data[off - init_off]);
189		off++;
190		--size;
191	}
192
193	return count;
194}
195
196static struct bin_attribute rio_config_attr = {
197	.attr = {
198		 .name = "config",
199		 .mode = S_IRUGO | S_IWUSR,
200		 .owner = THIS_MODULE,
201		 },
202	.size = 0x200000,
203	.read = rio_read_config,
204	.write = rio_write_config,
205};
206
207/**
208 * rio_create_sysfs_dev_files - create RIO specific sysfs files
209 * @rdev: device whose entries should be created
210 *
211 * Create files when @rdev is added to sysfs.
212 */
213int rio_create_sysfs_dev_files(struct rio_dev *rdev)
214{
215	sysfs_create_bin_file(&rdev->dev.kobj, &rio_config_attr);
216
217	return 0;
218}
219
220/**
221 * rio_remove_sysfs_dev_files - cleanup RIO specific sysfs files
222 * @rdev: device whose entries we should free
223 *
224 * Cleanup when @rdev is removed from sysfs.
225 */
226void rio_remove_sysfs_dev_files(struct rio_dev *rdev)
227{
228	sysfs_remove_bin_file(&rdev->dev.kobj, &rio_config_attr);
229}
230