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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2004-2013 Synopsys, Inc. (www.synopsys.com)
*
* Registers and bits definitions of ARC EMAC
*/
#ifndef ARC_EMAC_H
#define ARC_EMAC_H
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/netdevice.h>
#include <linux/phy.h>
#include <linux/clk.h>
/* STATUS and ENABLE Register bit masks */
#define TXINT_MASK (1 << 0) /* Transmit interrupt */
#define RXINT_MASK (1 << 1) /* Receive interrupt */
#define ERR_MASK (1 << 2) /* Error interrupt */
#define TXCH_MASK (1 << 3) /* Transmit chaining error interrupt */
#define MSER_MASK (1 << 4) /* Missed packet counter error */
#define RXCR_MASK (1 << 8) /* RXCRCERR counter rolled over */
#define RXFR_MASK (1 << 9) /* RXFRAMEERR counter rolled over */
#define RXFL_MASK (1 << 10) /* RXOFLOWERR counter rolled over */
#define MDIO_MASK (1 << 12) /* MDIO complete interrupt */
#define TXPL_MASK (1 << 31) /* Force polling of BD by EMAC */
/* CONTROL Register bit masks */
#define EN_MASK (1 << 0) /* VMAC enable */
#define TXRN_MASK (1 << 3) /* TX enable */
#define RXRN_MASK (1 << 4) /* RX enable */
#define DSBC_MASK (1 << 8) /* Disable receive broadcast */
#define ENFL_MASK (1 << 10) /* Enable Full-duplex */
#define PROM_MASK (1 << 11) /* Promiscuous mode */
/* Buffer descriptor INFO bit masks */
#define OWN_MASK (1 << 31) /* 0-CPU or 1-EMAC owns buffer */
#define FIRST_MASK (1 << 16) /* First buffer in chain */
#define LAST_MASK (1 << 17) /* Last buffer in chain */
#define LEN_MASK 0x000007FF /* last 11 bits */
#define CRLS (1 << 21)
#define DEFR (1 << 22)
#define DROP (1 << 23)
#define RTRY (1 << 24)
#define LTCL (1 << 28)
#define UFLO (1 << 29)
#define FOR_EMAC OWN_MASK
#define FOR_CPU 0
/* ARC EMAC register set combines entries for MAC and MDIO */
enum {
R_ID = 0,
R_STATUS,
R_ENABLE,
R_CTRL,
R_POLLRATE,
R_RXERR,
R_MISS,
R_TX_RING,
R_RX_RING,
R_ADDRL,
R_ADDRH,
R_LAFL,
R_LAFH,
R_MDIO,
};
#define TX_TIMEOUT (400 * HZ / 1000) /* Transmission timeout */
#define ARC_EMAC_NAPI_WEIGHT 40 /* Workload for NAPI */
#define EMAC_BUFFER_SIZE 1536 /* EMAC buffer size */
/**
* struct arc_emac_bd - EMAC buffer descriptor (BD).
*
* @info: Contains status information on the buffer itself.
* @data: 32-bit byte addressable pointer to the packet data.
*/
struct arc_emac_bd {
__le32 info;
dma_addr_t data;
};
/* Number of Rx/Tx BD's */
#define RX_BD_NUM 128
#define TX_BD_NUM 128
#define RX_RING_SZ (RX_BD_NUM * sizeof(struct arc_emac_bd))
#define TX_RING_SZ (TX_BD_NUM * sizeof(struct arc_emac_bd))
/**
* struct buffer_state - Stores Rx/Tx buffer state.
* @sk_buff: Pointer to socket buffer.
* @addr: Start address of DMA-mapped memory region.
* @len: Length of DMA-mapped memory region.
*/
struct buffer_state {
struct sk_buff *skb;
DEFINE_DMA_UNMAP_ADDR(addr);
DEFINE_DMA_UNMAP_LEN(len);
};
struct arc_emac_mdio_bus_data {
struct gpio_desc *reset_gpio;
int msec;
};
/**
* struct arc_emac_priv - Storage of EMAC's private information.
* @dev: Pointer to the current device.
* @phy_dev: Pointer to attached PHY device.
* @bus: Pointer to the current MII bus.
* @regs: Base address of EMAC memory-mapped control registers.
* @napi: Structure for NAPI.
* @rxbd: Pointer to Rx BD ring.
* @txbd: Pointer to Tx BD ring.
* @rxbd_dma: DMA handle for Rx BD ring.
* @txbd_dma: DMA handle for Tx BD ring.
* @rx_buff: Storage for Rx buffers states.
* @tx_buff: Storage for Tx buffers states.
* @txbd_curr: Index of Tx BD to use on the next "ndo_start_xmit".
* @txbd_dirty: Index of Tx BD to free on the next Tx interrupt.
* @last_rx_bd: Index of the last Rx BD we've got from EMAC.
* @link: PHY's last seen link state.
* @duplex: PHY's last set duplex mode.
* @speed: PHY's last set speed.
*/
struct arc_emac_priv {
const char *drv_name;
void (*set_mac_speed)(void *priv, unsigned int speed);
/* Devices */
struct device *dev;
struct mii_bus *bus;
struct arc_emac_mdio_bus_data bus_data;
void __iomem *regs;
struct clk *clk;
struct napi_struct napi;
struct arc_emac_bd *rxbd;
struct arc_emac_bd *txbd;
dma_addr_t rxbd_dma;
dma_addr_t txbd_dma;
struct buffer_state rx_buff[RX_BD_NUM];
struct buffer_state tx_buff[TX_BD_NUM];
unsigned int txbd_curr;
unsigned int txbd_dirty;
unsigned int last_rx_bd;
unsigned int link;
unsigned int duplex;
unsigned int speed;
unsigned int rx_missed_errors;
};
/**
* arc_reg_set - Sets EMAC register with provided value.
* @priv: Pointer to ARC EMAC private data structure.
* @reg: Register offset from base address.
* @value: Value to set in register.
*/
static inline void arc_reg_set(struct arc_emac_priv *priv, int reg, int value)
{
iowrite32(value, priv->regs + reg * sizeof(int));
}
/**
* arc_reg_get - Gets value of specified EMAC register.
* @priv: Pointer to ARC EMAC private data structure.
* @reg: Register offset from base address.
*
* returns: Value of requested register.
*/
static inline unsigned int arc_reg_get(struct arc_emac_priv *priv, int reg)
{
return ioread32(priv->regs + reg * sizeof(int));
}
/**
* arc_reg_or - Applies mask to specified EMAC register - ("reg" | "mask").
* @priv: Pointer to ARC EMAC private data structure.
* @reg: Register offset from base address.
* @mask: Mask to apply to specified register.
*
* This function reads initial register value, then applies provided mask
* to it and then writes register back.
*/
static inline void arc_reg_or(struct arc_emac_priv *priv, int reg, int mask)
{
unsigned int value = arc_reg_get(priv, reg);
arc_reg_set(priv, reg, value | mask);
}
/**
* arc_reg_clr - Applies mask to specified EMAC register - ("reg" & ~"mask").
* @priv: Pointer to ARC EMAC private data structure.
* @reg: Register offset from base address.
* @mask: Mask to apply to specified register.
*
* This function reads initial register value, then applies provided mask
* to it and then writes register back.
*/
static inline void arc_reg_clr(struct arc_emac_priv *priv, int reg, int mask)
{
unsigned int value = arc_reg_get(priv, reg);
arc_reg_set(priv, reg, value & ~mask);
}
int arc_mdio_probe(struct arc_emac_priv *priv);
int arc_mdio_remove(struct arc_emac_priv *priv);
int arc_emac_probe(struct net_device *ndev, int interface);
int arc_emac_remove(struct net_device *ndev);
#endif /* ARC_EMAC_H */
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