static int bpe_lookup(struct nfp_device *nfp, int nbi, u32 *bpe, int bpe_max)
{
int err, i;
const struct nfp_rtsym *sym;
u32 id, tmp;
u32 __iomem *ptr;
struct nfp_cpp_area *area;
char buff[] = "nbi0_dma_bpe_credits";
buff[3] += nbi;
sym = nfp_rtsym_lookup(nfp, buff);
if (!sym) {
nfp_info(nfp, "%s: Symbol not present\n", buff);
return 0;
}
id = NFP_CPP_ISLAND_ID(sym->target, NFP_CPP_ACTION_RW, 0, sym->domain);
area = nfp_cpp_area_alloc_acquire(nfp_device_cpp(nfp), id, sym->addr,
sym->size);
if (IS_ERR_OR_NULL(area)) {
nfp_err(nfp, "%s: Can't acquire area\n", buff);
return area ? PTR_ERR(area) : -ENOMEM;
}
ptr = nfp_cpp_area_iomem(area);
if (IS_ERR_OR_NULL(ptr)) {
nfp_err(nfp, "%s: Can't map area\n", buff);
err = ptr ? PTR_ERR(ptr) : -ENOMEM;
goto exit;
}
tmp = readl(ptr++);
if (!BPECFG_MAGIC_CHECK(tmp)) {
nfp_err(nfp, "%s: Magic value (0x%08x) unrecognized\n",
buff, tmp);
err = -EINVAL;
goto exit;
}
if (BPECFG_MAGIC_COUNT(tmp) > bpe_max) {
nfp_err(nfp, "%s: Magic count (%d) too large (> %d)\n",
buff, BPECFG_MAGIC_COUNT(tmp), bpe_max);
err = -EINVAL;
goto exit;
}
for (i = 0; i < bpe_max; i++)
bpe[i] = readl(ptr++);
err = BPECFG_MAGIC_COUNT(tmp);
exit:
nfp_cpp_area_release_free(area);
return err;
}
/**
* nfp_rtsym_read_le() - Read a simple unsigned scalar value from symbol
* @cpp: NFP CPP handle
* @name: Symbol name
* @error: Poniter to error code (optional)
*
* Lookup a symbol, map, read it and return it's value. Value of the symbol
* will be interpreted as a simple little-endian unsigned value. Symbol can
* be 4 or 8 bytes in size.
*
* Return: value read, on error sets the error and returns ~0ULL.
*/
u64 nfp_rtsym_read_le(struct nfp_cpp *cpp, const char *name, int *error)
{
const struct nfp_rtsym *sym;
u32 val32, id;
u64 val;
int err;
sym = nfp_rtsym_lookup(cpp, name);
if (!sym) {
err = -ENOENT;
goto exit;
}
id = NFP_CPP_ISLAND_ID(sym->target, NFP_CPP_ACTION_RW, 0, sym->domain);
switch (sym->size) {
case 4:
err = nfp_cpp_readl(cpp, id, sym->addr, &val32);
val = val32;
break;
case 8:
err = nfp_cpp_readq(cpp, id, sym->addr, &val);
break;
default:
nfp_err(cpp,
"rtsym '%s' unsupported or non-scalar size: %lld\n",
name, sym->size);
err = -EINVAL;
break;
}
if (err == sym->size)
err = 0;
else if (err >= 0)
err = -EIO;
exit:
if (error)
*error = err;
if (err)
return ~0ULL;
return val;
}
