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(rdev->net->hport->sys_size);
  47                         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 file *filp, struct kobject *kobj,
  72                 struct bin_attribute *bin_attr,
  73                 char *buf, loff_t off, size_t count)
  74 {
  75         struct rio_dev *dev =
  76             to_rio_dev(container_of(kobj, struct device, kobj));
  77         unsigned int size = 0x100;
  78         loff_t init_off = off;
  79         u8 *data = (u8 *) buf;
  80
  81         /* Several chips lock up trying to read undefined config space */
  82         if (capable(CAP_SYS_ADMIN))
  83                 size = 0x200000;
  84
  85         if (off > size)
  86                 return 0;
  87         if (off + count > size) {
  88                 size -= off;
  89                 count = size;
  90         } else {
  91                 size = count;
  92         }
  93
  94         if ((off & 1) && size) {
  95                 u8 val;
  96                 rio_read_config_8(dev, off, &val);
  97                 data[off - init_off] = val;
  98                 off++;
  99                 size--;
 100         }
 101
 102         if ((off & 3) && size > 2) {
 103                 u16 val;
 104                 rio_read_config_16(dev, off, &val);
 105                 data[off - init_off] = (val >> 8) & 0xff;
 106                 data[off - init_off + 1] = val & 0xff;
 107                 off += 2;
 108                 size -= 2;
 109         }
 110
 111         while (size > 3) {
 112                 u32 val;
 113                 rio_read_config_32(dev, off, &val);
 114                 data[off - init_off] = (val >> 24) & 0xff;
 115                 data[off - init_off + 1] = (val >> 16) & 0xff;
 116                 data[off - init_off + 2] = (val >> 8) & 0xff;
 117                 data[off - init_off + 3] = val & 0xff;
 118                 off += 4;
 119                 size -= 4;
 120         }
 121
 122         if (size >= 2) {
 123                 u16 val;
 124                 rio_read_config_16(dev, off, &val);
 125                 data[off - init_off] = (val >> 8) & 0xff;
 126                 data[off - init_off + 1] = val & 0xff;
 127                 off += 2;
 128                 size -= 2;
 129         }
 130
 131         if (size > 0) {
 132                 u8 val;
 133                 rio_read_config_8(dev, off, &val);
 134                 data[off - init_off] = val;
 135                 off++;
 136                 --size;
 137         }
 138
 139         return count;
 140 }
 141
 142 static ssize_t
 143 rio_write_config(struct file *filp, struct kobject *kobj,
 144                  struct bin_attribute *bin_attr,
 145                  char *buf, loff_t off, size_t count)
 146 {
 147         struct rio_dev *dev =
 148             to_rio_dev(container_of(kobj, struct device, kobj));
 149         unsigned int size = count;
 150         loff_t init_off = off;
 151         u8 *data = (u8 *) buf;
 152
 153         if (off > 0x200000)
 154                 return 0;
 155         if (off + count > 0x200000) {
 156                 size = 0x200000 - off;
 157                 count = size;
 158         }
 159
 160         if ((off & 1) && size) {
 161                 rio_write_config_8(dev, off, data[off - init_off]);
 162                 off++;
 163                 size--;
 164         }
 165
 166         if ((off & 3) && (size > 2)) {
 167                 u16 val = data[off - init_off + 1];
 168                 val |= (u16) data[off - init_off] << 8;
 169                 rio_write_config_16(dev, off, val);
 170                 off += 2;
 171                 size -= 2;
 172         }
 173
 174         while (size > 3) {
 175                 u32 val = data[off - init_off + 3];
 176                 val |= (u32) data[off - init_off + 2] << 8;
 177                 val |= (u32) data[off - init_off + 1] << 16;
 178                 val |= (u32) data[off - init_off] << 24;
 179                 rio_write_config_32(dev, off, val);
 180                 off += 4;
 181                 size -= 4;
 182         }
 183
 184         if (size >= 2) {
 185                 u16 val = data[off - init_off + 1];
 186                 val |= (u16) data[off - init_off] << 8;
 187                 rio_write_config_16(dev, off, val);
 188                 off += 2;
 189                 size -= 2;
 190         }
 191
 192         if (size) {
 193                 rio_write_config_8(dev, off, data[off - init_off]);
 194                 off++;
 195                 --size;
 196         }
 197
 198         return count;
 199 }
 200
 201 static struct bin_attribute rio_config_attr = {
 202         .attr = {
 203                  .name = "config",
 204                  .mode = S_IRUGO | S_IWUSR,
 205                  },
 206         .size = 0x200000,
 207         .read = rio_read_config,
 208         .write = rio_write_config,
 209 };
 210
 211 /**
 212  * rio_create_sysfs_dev_files - create RIO specific sysfs files
 213  * @rdev: device whose entries should be created
 214  *
 215  * Create files when @rdev is added to sysfs.
 216  */
 217 int rio_create_sysfs_dev_files(struct rio_dev *rdev)
 218 {
 219         int err = 0;
 220
 221         err = sysfs_create_bin_file(&rdev->dev.kobj, &rio_config_attr);
 222
 223         return err;
 224 }
 225
 226 /**
 227  * rio_remove_sysfs_dev_files - cleanup RIO specific sysfs files
 228  * @rdev: device whose entries we should free
 229  *
 230  * Cleanup when @rdev is removed from sysfs.
 231  */
 232 void rio_remove_sysfs_dev_files(struct rio_dev *rdev)
 233 {
 234         sysfs_remove_bin_file(&rdev->dev.kobj, &rio_config_attr);
 235 }