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
  18 #include "rio.h"
  19
  20 /* Sysfs support */
  21 #define rio_config_attr(field, format_string)                                   \
  22 static ssize_t                                                          \
  23 field##_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
  30 rio_config_attr(did, "0x%04x\n");
  31 rio_config_attr(vid, "0x%04x\n");
  32 rio_config_attr(device_rev, "0x%08x\n");
  33 rio_config_attr(asm_did, "0x%04x\n");
  34 rio_config_attr(asm_vid, "0x%04x\n");
  35 rio_config_attr(asm_rev, "0x%04x\n");
  36
  37 static 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
  58 struct 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
  69 static ssize_t
  70 rio_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
 139 static ssize_t
 140 rio_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
 196 static 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  */
 213 int 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  */
 226 void rio_remove_sysfs_dev_files(struct rio_dev *rdev)
 227 {
 228         sysfs_remove_bin_file(&rdev->dev.kobj, &rio_config_attr);
 229 }