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// SPDX-License-Identifier: (GPL-2.0 OR MIT)
/*
* Copyright (c) 2018 Synopsys, Inc. and/or its affiliates.
* stmmac XGMAC support.
*/
#include <linux/stmmac.h>
#include "common.h"
#include "dwxgmac2.h"
static int dwxgmac2_get_tx_status(void *data, struct stmmac_extra_stats *x,
struct dma_desc *p, void __iomem *ioaddr)
{
unsigned int tdes3 = le32_to_cpu(p->des3);
int ret = tx_done;
if (unlikely(tdes3 & XGMAC_TDES3_OWN))
return tx_dma_own;
if (likely(!(tdes3 & XGMAC_TDES3_LD)))
return tx_not_ls;
return ret;
}
static int dwxgmac2_get_rx_status(void *data, struct stmmac_extra_stats *x,
struct dma_desc *p)
{
unsigned int rdes3 = le32_to_cpu(p->des3);
int ret = good_frame;
if (unlikely(rdes3 & XGMAC_RDES3_OWN))
return dma_own;
if (likely(!(rdes3 & XGMAC_RDES3_LD)))
return discard_frame;
if (unlikely(rdes3 & XGMAC_RDES3_ES))
ret = discard_frame;
return ret;
}
static int dwxgmac2_get_tx_len(struct dma_desc *p)
{
return (le32_to_cpu(p->des2) & XGMAC_TDES2_B1L);
}
static int dwxgmac2_get_tx_owner(struct dma_desc *p)
{
return (le32_to_cpu(p->des3) & XGMAC_TDES3_OWN) > 0;
}
static void dwxgmac2_set_tx_owner(struct dma_desc *p)
{
p->des3 |= cpu_to_le32(XGMAC_TDES3_OWN);
}
static void dwxgmac2_set_rx_owner(struct dma_desc *p, int disable_rx_ic)
{
p->des3 = cpu_to_le32(XGMAC_RDES3_OWN);
if (!disable_rx_ic)
p->des3 |= cpu_to_le32(XGMAC_RDES3_IOC);
}
static int dwxgmac2_get_tx_ls(struct dma_desc *p)
{
return (le32_to_cpu(p->des3) & XGMAC_RDES3_LD) > 0;
}
static int dwxgmac2_get_rx_frame_len(struct dma_desc *p, int rx_coe)
{
return (le32_to_cpu(p->des3) & XGMAC_RDES3_PL);
}
static void dwxgmac2_enable_tx_timestamp(struct dma_desc *p)
{
p->des2 |= cpu_to_le32(XGMAC_TDES2_TTSE);
}
static int dwxgmac2_get_tx_timestamp_status(struct dma_desc *p)
{
return 0; /* Not supported */
}
static inline void dwxgmac2_get_timestamp(void *desc, u32 ats, u64 *ts)
{
struct dma_desc *p = (struct dma_desc *)desc;
u64 ns = 0;
ns += le32_to_cpu(p->des1) * 1000000000ULL;
ns += le32_to_cpu(p->des0);
*ts = ns;
}
static int dwxgmac2_rx_check_timestamp(void *desc)
{
struct dma_desc *p = (struct dma_desc *)desc;
unsigned int rdes3 = le32_to_cpu(p->des3);
bool desc_valid, ts_valid;
desc_valid = !(rdes3 & XGMAC_RDES3_OWN) && (rdes3 & XGMAC_RDES3_CTXT);
ts_valid = !(rdes3 & XGMAC_RDES3_TSD) && (rdes3 & XGMAC_RDES3_TSA);
if (likely(desc_valid && ts_valid))
return 0;
return -EINVAL;
}
static int dwxgmac2_get_rx_timestamp_status(void *desc, void *next_desc,
u32 ats)
{
struct dma_desc *p = (struct dma_desc *)desc;
unsigned int rdes3 = le32_to_cpu(p->des3);
int ret = -EBUSY;
if (likely(rdes3 & XGMAC_RDES3_CDA)) {
ret = dwxgmac2_rx_check_timestamp(next_desc);
if (ret)
return ret;
}
return ret;
}
static void dwxgmac2_init_rx_desc(struct dma_desc *p, int disable_rx_ic,
int mode, int end)
{
dwxgmac2_set_rx_owner(p, disable_rx_ic);
}
static void dwxgmac2_init_tx_desc(struct dma_desc *p, int mode, int end)
{
p->des0 = 0;
p->des1 = 0;
p->des2 = 0;
p->des3 = 0;
}
static void dwxgmac2_prepare_tx_desc(struct dma_desc *p, int is_fs, int len,
bool csum_flag, int mode, bool tx_own,
bool ls, unsigned int tot_pkt_len)
{
unsigned int tdes3 = le32_to_cpu(p->des3);
p->des2 |= cpu_to_le32(len & XGMAC_TDES2_B1L);
tdes3 = tot_pkt_len & XGMAC_TDES3_FL;
if (is_fs)
tdes3 |= XGMAC_TDES3_FD;
else
tdes3 &= ~XGMAC_TDES3_FD;
if (csum_flag)
tdes3 |= 0x3 << XGMAC_TDES3_CIC_SHIFT;
else
tdes3 &= ~XGMAC_TDES3_CIC;
if (ls)
tdes3 |= XGMAC_TDES3_LD;
else
tdes3 &= ~XGMAC_TDES3_LD;
/* Finally set the OWN bit. Later the DMA will start! */
if (tx_own)
tdes3 |= XGMAC_TDES3_OWN;
if (is_fs && tx_own)
/* When the own bit, for the first frame, has to be set, all
* descriptors for the same frame has to be set before, to
* avoid race condition.
*/
dma_wmb();
p->des3 = cpu_to_le32(tdes3);
}
static void dwxgmac2_prepare_tso_tx_desc(struct dma_desc *p, int is_fs,
int len1, int len2, bool tx_own,
bool ls, unsigned int tcphdrlen,
unsigned int tcppayloadlen)
{
unsigned int tdes3 = le32_to_cpu(p->des3);
if (len1)
p->des2 |= cpu_to_le32(len1 & XGMAC_TDES2_B1L);
if (len2)
p->des2 |= cpu_to_le32((len2 << XGMAC_TDES2_B2L_SHIFT) &
XGMAC_TDES2_B2L);
if (is_fs) {
tdes3 |= XGMAC_TDES3_FD | XGMAC_TDES3_TSE;
tdes3 |= (tcphdrlen << XGMAC_TDES3_THL_SHIFT) &
XGMAC_TDES3_THL;
tdes3 |= tcppayloadlen & XGMAC_TDES3_TPL;
} else {
tdes3 &= ~XGMAC_TDES3_FD;
}
if (ls)
tdes3 |= XGMAC_TDES3_LD;
else
tdes3 &= ~XGMAC_TDES3_LD;
/* Finally set the OWN bit. Later the DMA will start! */
if (tx_own)
tdes3 |= XGMAC_TDES3_OWN;
if (is_fs && tx_own)
/* When the own bit, for the first frame, has to be set, all
* descriptors for the same frame has to be set before, to
* avoid race condition.
*/
dma_wmb();
p->des3 = cpu_to_le32(tdes3);
}
static void dwxgmac2_release_tx_desc(struct dma_desc *p, int mode)
{
p->des0 = 0;
p->des1 = 0;
p->des2 = 0;
p->des3 = 0;
}
static void dwxgmac2_set_tx_ic(struct dma_desc *p)
{
p->des2 |= cpu_to_le32(XGMAC_TDES2_IOC);
}
static void dwxgmac2_set_mss(struct dma_desc *p, unsigned int mss)
{
p->des0 = 0;
p->des1 = 0;
p->des2 = cpu_to_le32(mss);
p->des3 = cpu_to_le32(XGMAC_TDES3_CTXT | XGMAC_TDES3_TCMSSV);
}
static void dwxgmac2_get_addr(struct dma_desc *p, unsigned int *addr)
{
*addr = le32_to_cpu(p->des0);
}
static void dwxgmac2_set_addr(struct dma_desc *p, dma_addr_t addr)
{
p->des0 = cpu_to_le32(addr);
p->des1 = 0;
}
static void dwxgmac2_clear(struct dma_desc *p)
{
p->des0 = 0;
p->des1 = 0;
p->des2 = 0;
p->des3 = 0;
}
const struct stmmac_desc_ops dwxgmac210_desc_ops = {
.tx_status = dwxgmac2_get_tx_status,
.rx_status = dwxgmac2_get_rx_status,
.get_tx_len = dwxgmac2_get_tx_len,
.get_tx_owner = dwxgmac2_get_tx_owner,
.set_tx_owner = dwxgmac2_set_tx_owner,
.set_rx_owner = dwxgmac2_set_rx_owner,
.get_tx_ls = dwxgmac2_get_tx_ls,
.get_rx_frame_len = dwxgmac2_get_rx_frame_len,
.enable_tx_timestamp = dwxgmac2_enable_tx_timestamp,
.get_tx_timestamp_status = dwxgmac2_get_tx_timestamp_status,
.get_rx_timestamp_status = dwxgmac2_get_rx_timestamp_status,
.get_timestamp = dwxgmac2_get_timestamp,
.set_tx_ic = dwxgmac2_set_tx_ic,
.prepare_tx_desc = dwxgmac2_prepare_tx_desc,
.prepare_tso_tx_desc = dwxgmac2_prepare_tso_tx_desc,
.release_tx_desc = dwxgmac2_release_tx_desc,
.init_rx_desc = dwxgmac2_init_rx_desc,
.init_tx_desc = dwxgmac2_init_tx_desc,
.set_mss = dwxgmac2_set_mss,
.get_addr = dwxgmac2_get_addr,
.set_addr = dwxgmac2_set_addr,
.clear = dwxgmac2_clear,
};
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