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/config.h>
  14 #include <linux/kernel.h>
  15 #include <linux/rio.h>
  16 #include <linux/rio_drv.h>
  17 #include <linux/stat.h>
  18 #include <linux/sched.h>        /* for capable() */
  19
  20 #include "rio.h"
  21
  22 /* Sysfs support */
  23 #define rio_config_attr(field, format_string)                                   \
  24 static ssize_t                                                          \
  25 field##_show(struct device *dev, struct device_attribute *attr, char *buf)                      \
  26 {                                                                       \
  27         struct rio_dev *rdev = to_rio_dev(dev);                         \
  28                                                                         \
  29         return sprintf(buf, format_string, rdev->field);                \
  30 }                                                                       \
  31
  32 rio_config_attr(did, "0x%04x\n");
  33 rio_config_attr(vid, "0x%04x\n");
  34 rio_config_attr(device_rev, "0x%08x\n");
  35 rio_config_attr(asm_did, "0x%04x\n");
  36 rio_config_attr(asm_vid, "0x%04x\n");
  37 rio_config_attr(asm_rev, "0x%04x\n");
  38
  39 static ssize_t routes_show(struct device *dev, struct device_attribute *attr, char *buf)
  40 {
  41         struct rio_dev *rdev = to_rio_dev(dev);
  42         char *str = buf;
  43         int i;
  44
  45         if (!rdev->rswitch)
  46                 goto out;
  47
  48         for (i = 0; i < RIO_MAX_ROUTE_ENTRIES; i++) {
  49                 if (rdev->rswitch->route_table[i] == RIO_INVALID_ROUTE)
  50                         continue;
  51                 str +=
  52                     sprintf(str, "%04x %02x\n", i,
  53                             rdev->rswitch->route_table[i]);
  54         }
  55
  56       out:
  57         return (str - buf);
  58 }
  59
  60 struct device_attribute rio_dev_attrs[] = {
  61         __ATTR_RO(did),
  62         __ATTR_RO(vid),
  63         __ATTR_RO(device_rev),
  64         __ATTR_RO(asm_did),
  65         __ATTR_RO(asm_vid),
  66         __ATTR_RO(asm_rev),
  67         __ATTR_RO(routes),
  68         __ATTR_NULL,
  69 };
  70
  71 static ssize_t
  72 rio_read_config(struct kobject *kobj, char *buf, loff_t off, size_t count)
  73 {
  74         struct rio_dev *dev =
  75             to_rio_dev(container_of(kobj, struct device, kobj));
  76         unsigned int size = 0x100;
  77         loff_t init_off = off;
  78         u8 *data = (u8 *) buf;
  79
  80         /* Several chips lock up trying to read undefined config space */
  81         if (capable(CAP_SYS_ADMIN))
  82                 size = 0x200000;
  83
  84         if (off > size)
  85                 return 0;
  86         if (off + count > size) {
  87                 size -= off;
  88                 count = size;
  89         } else {
  90                 size = count;
  91         }
  92
  93         if ((off & 1) && size) {
  94                 u8 val;
  95                 rio_read_config_8(dev, off, &val);
  96                 data[off - init_off] = val;
  97                 off++;
  98                 size--;
  99         }
 100
 101         if ((off & 3) && size > 2) {
 102                 u16 val;
 103                 rio_read_config_16(dev, off, &val);
 104                 data[off - init_off] = (val >> 8) & 0xff;
 105                 data[off - init_off + 1] = val & 0xff;
 106                 off += 2;
 107                 size -= 2;
 108         }
 109
 110         while (size > 3) {
 111                 u32 val;
 112                 rio_read_config_32(dev, off, &val);
 113                 data[off - init_off] = (val >> 24) & 0xff;
 114                 data[off - init_off + 1] = (val >> 16) & 0xff;
 115                 data[off - init_off + 2] = (val >> 8) & 0xff;
 116                 data[off - init_off + 3] = val & 0xff;
 117                 off += 4;
 118                 size -= 4;
 119         }
 120
 121         if (size >= 2) {
 122                 u16 val;
 123                 rio_read_config_16(dev, off, &val);
 124                 data[off - init_off] = (val >> 8) & 0xff;
 125                 data[off - init_off + 1] = val & 0xff;
 126                 off += 2;
 127                 size -= 2;
 128         }
 129
 130         if (size > 0) {
 131                 u8 val;
 132                 rio_read_config_8(dev, off, &val);
 133                 data[off - init_off] = val;
 134                 off++;
 135                 --size;
 136         }
 137
 138         return count;
 139 }
 140
 141 static ssize_t
 142 rio_write_config(struct kobject *kobj, char *buf, loff_t off, size_t count)
 143 {
 144         struct rio_dev *dev =
 145             to_rio_dev(container_of(kobj, struct device, kobj));
 146         unsigned int size = count;
 147         loff_t init_off = off;
 148         u8 *data = (u8 *) buf;
 149
 150         if (off > 0x200000)
 151                 return 0;
 152         if (off + count > 0x200000) {
 153                 size = 0x200000 - off;
 154                 count = size;
 155         }
 156
 157         if ((off & 1) && size) {
 158                 rio_write_config_8(dev, off, data[off - init_off]);
 159                 off++;
 160                 size--;
 161         }
 162
 163         if ((off & 3) && (size > 2)) {
 164                 u16 val = data[off - init_off + 1];
 165                 val |= (u16) data[off - init_off] << 8;
 166                 rio_write_config_16(dev, off, val);
 167                 off += 2;
 168                 size -= 2;
 169         }
 170
 171         while (size > 3) {
 172                 u32 val = data[off - init_off + 3];
 173                 val |= (u32) data[off - init_off + 2] << 8;
 174                 val |= (u32) data[off - init_off + 1] << 16;
 175                 val |= (u32) data[off - init_off] << 24;
 176                 rio_write_config_32(dev, off, val);
 177                 off += 4;
 178                 size -= 4;
 179         }
 180
 181         if (size >= 2) {
 182                 u16 val = data[off - init_off + 1];
 183                 val |= (u16) data[off - init_off] << 8;
 184                 rio_write_config_16(dev, off, val);
 185                 off += 2;
 186                 size -= 2;
 187         }
 188
 189         if (size) {
 190                 rio_write_config_8(dev, off, data[off - init_off]);
 191                 off++;
 192                 --size;
 193         }
 194
 195         return count;
 196 }
 197
 198 static struct bin_attribute rio_config_attr = {
 199         .attr = {
 200                  .name = "config",
 201                  .mode = S_IRUGO | S_IWUSR,
 202                  .owner = THIS_MODULE,
 203                  },
 204         .size = 0x200000,
 205         .read = rio_read_config,
 206         .write = rio_write_config,
 207 };
 208
 209 /**
 210  * rio_create_sysfs_dev_files - create RIO specific sysfs files
 211  * @rdev: device whose entries should be created
 212  *
 213  * Create files when @rdev is added to sysfs.
 214  */
 215 int rio_create_sysfs_dev_files(struct rio_dev *rdev)
 216 {
 217         sysfs_create_bin_file(&rdev->dev.kobj, &rio_config_attr);
 218
 219         return 0;
 220 }
 221
 222 /**
 223  * rio_remove_sysfs_dev_files - cleanup RIO specific sysfs files
 224  * @rdev: device whose entries we should free
 225  *
 226  * Cleanup when @rdev is removed from sysfs.
 227  */
 228 void rio_remove_sysfs_dev_files(struct rio_dev *rdev)
 229 {
 230         sysfs_remove_bin_file(&rdev->dev.kobj, &rio_config_attr);
 231 }