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// SPDX-License-Identifier: GPL-2.0-only
/*******************************************************************************
This is the driver for the MAC 10/100 on-chip Ethernet controller
currently tested on all the ST boards based on STb7109 and stx7200 SoCs.
DWC Ether MAC 10/100 Universal version 4.0 has been used for developing
this code.
This contains the functions to handle the dma.
Copyright (C) 2007-2009 STMicroelectronics Ltd
Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
*******************************************************************************/
#include <linux/io.h>
#include "dwmac100.h"
#include "dwmac_dma.h"
static void dwmac100_dma_init(void __iomem *ioaddr,
struct stmmac_dma_cfg *dma_cfg, int atds)
{
/* Enable Application Access by writing to DMA CSR0 */
writel(DMA_BUS_MODE_DEFAULT | (dma_cfg->pbl << DMA_BUS_MODE_PBL_SHIFT),
ioaddr + DMA_BUS_MODE);
/* Mask interrupts by writing to CSR7 */
writel(DMA_INTR_DEFAULT_MASK, ioaddr + DMA_INTR_ENA);
}
static void dwmac100_dma_init_rx(struct stmmac_priv *priv, void __iomem *ioaddr,
struct stmmac_dma_cfg *dma_cfg,
dma_addr_t dma_rx_phy, u32 chan)
{
/* RX descriptor base addr lists must be written into DMA CSR3 */
writel(lower_32_bits(dma_rx_phy), ioaddr + DMA_RCV_BASE_ADDR);
}
static void dwmac100_dma_init_tx(struct stmmac_priv *priv, void __iomem *ioaddr,
struct stmmac_dma_cfg *dma_cfg,
dma_addr_t dma_tx_phy, u32 chan)
{
/* TX descriptor base addr lists must be written into DMA CSR4 */
writel(lower_32_bits(dma_tx_phy), ioaddr + DMA_TX_BASE_ADDR);
}
/* Store and Forward capability is not used at all.
*
* The transmit threshold can be programmed by setting the TTC bits in the DMA
* control register.
*/
static void dwmac100_dma_operation_mode_tx(struct stmmac_priv *priv,
void __iomem *ioaddr, int mode,
u32 channel, int fifosz, u8 qmode)
{
u32 csr6 = readl(ioaddr + DMA_CONTROL);
if (mode <= 32)
csr6 |= DMA_CONTROL_TTC_32;
else if (mode <= 64)
csr6 |= DMA_CONTROL_TTC_64;
else
csr6 |= DMA_CONTROL_TTC_128;
writel(csr6, ioaddr + DMA_CONTROL);
}
static void dwmac100_dump_dma_regs(struct stmmac_priv *priv,
void __iomem *ioaddr, u32 *reg_space)
{
int i;
for (i = 0; i < NUM_DWMAC100_DMA_REGS; i++)
reg_space[DMA_BUS_MODE / 4 + i] =
readl(ioaddr + DMA_BUS_MODE + i * 4);
reg_space[DMA_CUR_TX_BUF_ADDR / 4] =
readl(ioaddr + DMA_CUR_TX_BUF_ADDR);
reg_space[DMA_CUR_RX_BUF_ADDR / 4] =
readl(ioaddr + DMA_CUR_RX_BUF_ADDR);
}
/* DMA controller has two counters to track the number of the missed frames. */
static void dwmac100_dma_diagnostic_fr(struct stmmac_extra_stats *x,
void __iomem *ioaddr)
{
u32 csr8 = readl(ioaddr + DMA_MISSED_FRAME_CTR);
if (unlikely(csr8)) {
if (csr8 & DMA_MISSED_FRAME_OVE) {
x->rx_overflow_cntr += 0x800;
} else {
unsigned int ove_cntr;
ove_cntr = ((csr8 & DMA_MISSED_FRAME_OVE_CNTR) >> 17);
x->rx_overflow_cntr += ove_cntr;
}
if (csr8 & DMA_MISSED_FRAME_OVE_M) {
x->rx_missed_cntr += 0xffff;
} else {
unsigned int miss_f = (csr8 & DMA_MISSED_FRAME_M_CNTR);
x->rx_missed_cntr += miss_f;
}
}
}
const struct stmmac_dma_ops dwmac100_dma_ops = {
.reset = dwmac_dma_reset,
.init = dwmac100_dma_init,
.init_rx_chan = dwmac100_dma_init_rx,
.init_tx_chan = dwmac100_dma_init_tx,
.dump_regs = dwmac100_dump_dma_regs,
.dma_tx_mode = dwmac100_dma_operation_mode_tx,
.dma_diagnostic_fr = dwmac100_dma_diagnostic_fr,
.enable_dma_transmission = dwmac_enable_dma_transmission,
.enable_dma_irq = dwmac_enable_dma_irq,
.disable_dma_irq = dwmac_disable_dma_irq,
.start_tx = dwmac_dma_start_tx,
.stop_tx = dwmac_dma_stop_tx,
.start_rx = dwmac_dma_start_rx,
.stop_rx = dwmac_dma_stop_rx,
.dma_interrupt = dwmac_dma_interrupt,
};
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