drivers/rapidio/rio-sysfs.c

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