drivers/fmc/fmc-sdb.c

   1 /*
   2  * Copyright (C) 2012 CERN (www.cern.ch)
   3  * Author: Alessandro Rubini <rubini@gnudd.com>
   4  *
   5  * Released according to the GNU GPL, version 2 or any later version.
   6  *
   7  * This work is part of the White Rabbit project, a research effort led
   8  * by CERN, the European Institute for Nuclear Research.
   9  */
  10 #include <linux/module.h>
  11 #include <linux/slab.h>
  12 #include <linux/fmc.h>
  13 #include <linux/sdb.h>
  14 #include <linux/err.h>
  15 #include <linux/fmc-sdb.h>
  16 #include <asm/byteorder.h>
  17
  18 static uint32_t __sdb_rd(struct fmc_device *fmc, unsigned long address,
  19                         int convert)
  20 {
  21         uint32_t res = fmc_readl(fmc, address);
  22         if (convert)
  23                 return __be32_to_cpu(res);
  24         return res;
  25 }
  26
  27 static struct sdb_array *__fmc_scan_sdb_tree(struct fmc_device *fmc,
  28                                              unsigned long sdb_addr,
  29                                              unsigned long reg_base, int level)
  30 {
  31         uint32_t onew;
  32         int i, j, n, convert = 0;
  33         struct sdb_array *arr, *sub;
  34
  35         onew = fmc_readl(fmc, sdb_addr);
  36         if (onew == SDB_MAGIC) {
  37                 /* Uh! If we are little-endian, we must convert */
  38                 if (SDB_MAGIC != __be32_to_cpu(SDB_MAGIC))
  39                         convert = 1;
  40         } else if (onew == __be32_to_cpu(SDB_MAGIC)) {
  41                 /* ok, don't convert */
  42         } else {
  43                 return ERR_PTR(-ENOENT);
  44         }
  45         /* So, the magic was there: get the count from offset 4*/
  46         onew = __sdb_rd(fmc, sdb_addr + 4, convert);
  47         n = __be16_to_cpu(*(uint16_t *)&onew);
  48         arr = kzalloc(sizeof(*arr), GFP_KERNEL);
  49         if (!arr)
  50                 return ERR_PTR(-ENOMEM);
  51         arr->record = kcalloc(n, sizeof(arr->record[0]), GFP_KERNEL);
  52         arr->subtree = kcalloc(n, sizeof(arr->subtree[0]), GFP_KERNEL);
  53         if (!arr->record || !arr->subtree) {
  54                 kfree(arr->record);
  55                 kfree(arr->subtree);
  56                 kfree(arr);
  57                 return ERR_PTR(-ENOMEM);
  58         }
  59
  60         arr->len = n;
  61         arr->level = level;
  62         arr->fmc = fmc;
  63         for (i = 0; i < n; i++) {
  64                 union  sdb_record *r;
  65
  66                 for (j = 0; j < sizeof(arr->record[0]); j += 4) {
  67                         *(uint32_t *)((void *)(arr->record + i) + j) =
  68                                 __sdb_rd(fmc, sdb_addr + (i * 64) + j, convert);
  69                 }
  70                 r = &arr->record[i];
  71                 arr->subtree[i] = ERR_PTR(-ENODEV);
  72                 if (r->empty.record_type == sdb_type_bridge) {
  73                         struct sdb_component *c = &r->bridge.sdb_component;
  74                         uint64_t subaddr = __be64_to_cpu(r->bridge.sdb_child);
  75                         uint64_t newbase = __be64_to_cpu(c->addr_first);
  76
  77                         subaddr += reg_base;
  78                         newbase += reg_base;
  79                         sub = __fmc_scan_sdb_tree(fmc, subaddr, newbase,
  80                                                   level + 1);
  81                         arr->subtree[i] = sub; /* may be error */
  82                         if (IS_ERR(sub))
  83                                 continue;
  84                         sub->parent = arr;
  85                         sub->baseaddr = newbase;
  86                 }
  87         }
  88         return arr;
  89 }
  90
  91 int fmc_scan_sdb_tree(struct fmc_device *fmc, unsigned long address)
  92 {
  93         struct sdb_array *ret;
  94         if (fmc->sdb)
  95                 return -EBUSY;
  96         ret = __fmc_scan_sdb_tree(fmc, address, 0 /* regs */, 0);
  97         if (IS_ERR(ret))
  98                 return PTR_ERR(ret);
  99         fmc->sdb = ret;
 100         return 0;
 101 }
 102 EXPORT_SYMBOL(fmc_scan_sdb_tree);
 103
 104 static void __fmc_sdb_free(struct sdb_array *arr)
 105 {
 106         int i, n;
 107
 108         if (!arr)
 109                 return;
 110         n = arr->len;
 111         for (i = 0; i < n; i++) {
 112                 if (IS_ERR(arr->subtree[i]))
 113                         continue;
 114                 __fmc_sdb_free(arr->subtree[i]);
 115         }
 116         kfree(arr->record);
 117         kfree(arr->subtree);
 118         kfree(arr);
 119 }
 120
 121 int fmc_free_sdb_tree(struct fmc_device *fmc)
 122 {
 123         __fmc_sdb_free(fmc->sdb);
 124         fmc->sdb = NULL;
 125         return 0;
 126 }
 127 EXPORT_SYMBOL(fmc_free_sdb_tree);
 128
 129 /* This helper calls reprogram and inizialized sdb as well */
 130 int fmc_reprogram_raw(struct fmc_device *fmc, struct fmc_driver *d,
 131                       void *gw, unsigned long len, int sdb_entry)
 132 {
 133         int ret;
 134
 135         ret = fmc->op->reprogram_raw(fmc, d, gw, len);
 136         if (ret < 0)
 137                 return ret;
 138         if (sdb_entry < 0)
 139                 return ret;
 140
 141         /* We are required to find SDB at a given offset */
 142         ret = fmc_scan_sdb_tree(fmc, sdb_entry);
 143         if (ret < 0) {
 144                 dev_err(&fmc->dev, "Can't find SDB at address 0x%x\n",
 145                         sdb_entry);
 146                 return -ENODEV;
 147         }
 148
 149         return 0;
 150 }
 151 EXPORT_SYMBOL(fmc_reprogram_raw);
 152
 153 /* This helper calls reprogram and inizialized sdb as well */
 154 int fmc_reprogram(struct fmc_device *fmc, struct fmc_driver *d, char *gw,
 155                          int sdb_entry)
 156 {
 157         int ret;
 158
 159         ret = fmc->op->reprogram(fmc, d, gw);
 160         if (ret < 0)
 161                 return ret;
 162         if (sdb_entry < 0)
 163                 return ret;
 164
 165         /* We are required to find SDB at a given offset */
 166         ret = fmc_scan_sdb_tree(fmc, sdb_entry);
 167         if (ret < 0) {
 168                 dev_err(&fmc->dev, "Can't find SDB at address 0x%x\n",
 169                         sdb_entry);
 170                 return -ENODEV;
 171         }
 172
 173         return 0;
 174 }
 175 EXPORT_SYMBOL(fmc_reprogram);
 176
 177 void fmc_show_sdb_tree(const struct fmc_device *fmc)
 178 {
 179         pr_err("%s: not supported anymore, use debugfs to dump SDB\n",
 180                 __func__);
 181 }
 182 EXPORT_SYMBOL(fmc_show_sdb_tree);
 183
 184 signed long fmc_find_sdb_device(struct sdb_array *tree,
 185                                 uint64_t vid, uint32_t did, unsigned long *sz)
 186 {
 187         signed long res = -ENODEV;
 188         union  sdb_record *r;
 189         struct sdb_product *p;
 190         struct sdb_component *c;
 191         int i, n = tree->len;
 192         uint64_t last, first;
 193
 194         /* FIXME: what if the first interconnect is not at zero? */
 195         for (i = 0; i < n; i++) {
 196                 r = &tree->record[i];
 197                 c = &r->dev.sdb_component;
 198                 p = &c->product;
 199
 200                 if (!IS_ERR(tree->subtree[i]))
 201                         res = fmc_find_sdb_device(tree->subtree[i],
 202                                                   vid, did, sz);
 203                 if (res >= 0)
 204                         return res + tree->baseaddr;
 205                 if (r->empty.record_type != sdb_type_device)
 206                         continue;
 207                 if (__be64_to_cpu(p->vendor_id) != vid)
 208                         continue;
 209                 if (__be32_to_cpu(p->device_id) != did)
 210                         continue;
 211                 /* found */
 212                 last = __be64_to_cpu(c->addr_last);
 213                 first = __be64_to_cpu(c->addr_first);
 214                 if (sz)
 215                         *sz = (typeof(*sz))(last + 1 - first);
 216                 return first + tree->baseaddr;
 217         }
 218         return res;
 219 }
 220 EXPORT_SYMBOL(fmc_find_sdb_device);