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// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
/* Copyright (C) 2018 Netronome Systems, Inc. */
#include <linux/bitfield.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include "nfp_net_ctrl.h"
#include "nfp_net.h"
static void nfp_net_tlv_caps_reset(struct nfp_net_tlv_caps *caps)
{
memset(caps, 0, sizeof(*caps));
caps->me_freq_mhz = 1200;
caps->mbox_off = NFP_NET_CFG_MBOX_BASE;
caps->mbox_len = NFP_NET_CFG_MBOX_VAL_MAX_SZ;
}
int nfp_net_tlv_caps_parse(struct device *dev, u8 __iomem *ctrl_mem,
struct nfp_net_tlv_caps *caps)
{
u8 __iomem *data = ctrl_mem + NFP_NET_CFG_TLV_BASE;
u8 __iomem *end = ctrl_mem + NFP_NET_CFG_BAR_SZ;
u32 hdr;
nfp_net_tlv_caps_reset(caps);
hdr = readl(data);
if (!hdr)
return 0;
while (true) {
unsigned int length, offset;
u32 hdr = readl(data);
length = FIELD_GET(NFP_NET_CFG_TLV_HEADER_LENGTH, hdr);
offset = data - ctrl_mem;
/* Advance past the header */
data += 4;
if (length % NFP_NET_CFG_TLV_LENGTH_INC) {
dev_err(dev, "TLV size not multiple of %u len:%u\n",
NFP_NET_CFG_TLV_LENGTH_INC, length);
return -EINVAL;
}
if (data + length > end) {
dev_err(dev, "oversized TLV offset:%u len:%u\n",
offset, length);
return -EINVAL;
}
switch (FIELD_GET(NFP_NET_CFG_TLV_HEADER_TYPE, hdr)) {
case NFP_NET_CFG_TLV_TYPE_UNKNOWN:
dev_err(dev, "NULL TLV at offset:%u\n", offset);
return -EINVAL;
case NFP_NET_CFG_TLV_TYPE_RESERVED:
break;
case NFP_NET_CFG_TLV_TYPE_END:
if (!length)
return 0;
dev_err(dev, "END TLV should be empty, has len:%d\n",
length);
return -EINVAL;
case NFP_NET_CFG_TLV_TYPE_ME_FREQ:
if (length != 4) {
dev_err(dev,
"ME FREQ TLV should be 4B, is %dB\n",
length);
return -EINVAL;
}
caps->me_freq_mhz = readl(data);
break;
case NFP_NET_CFG_TLV_TYPE_MBOX:
if (!length) {
caps->mbox_off = 0;
caps->mbox_len = 0;
} else {
caps->mbox_off = data - ctrl_mem;
caps->mbox_len = length;
}
break;
case NFP_NET_CFG_TLV_TYPE_EXPERIMENTAL0:
case NFP_NET_CFG_TLV_TYPE_EXPERIMENTAL1:
dev_warn(dev,
"experimental TLV type:%u offset:%u len:%u\n",
FIELD_GET(NFP_NET_CFG_TLV_HEADER_TYPE, hdr),
offset, length);
break;
default:
if (!FIELD_GET(NFP_NET_CFG_TLV_HEADER_REQUIRED, hdr))
break;
dev_err(dev, "unknown TLV type:%u offset:%u len:%u\n",
FIELD_GET(NFP_NET_CFG_TLV_HEADER_TYPE, hdr),
offset, length);
return -EINVAL;
}
data += length;
if (data + 4 > end) {
dev_err(dev, "reached end of BAR without END TLV\n");
return -EINVAL;
}
}
/* Not reached */
return -EINVAL;
}
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