cregit-Linux how code gets into the kernel

Release 4.11 drivers/net/ethernet/arc/emac.h

/*
 * 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;
	
const char *drv_version;
	
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;
};

/**
 * 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)); }

Contributors

PersonTokensPropCommitsCommitProp
Alexey Brodkin34100.00%1100.00%
Total34100.00%1100.00%

/** * 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)); }

Contributors

PersonTokensPropCommitsCommitProp
Alexey Brodkin31100.00%1100.00%
Total31100.00%1100.00%

/** * 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); }

Contributors

PersonTokensPropCommitsCommitProp
Alexey Brodkin40100.00%1100.00%
Total40100.00%1100.00%

/** * 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); }

Contributors

PersonTokensPropCommitsCommitProp
Alexey Brodkin41100.00%1100.00%
Total41100.00%1100.00%

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 */

Overall Contributors

PersonTokensPropCommitsCommitProp
Alexey Brodkin47582.61%114.29%
Romain Perier478.17%228.57%
Caesar Wang447.65%228.57%
Heiko Stübner81.39%114.29%
Tobias Klauser10.17%114.29%
Total575100.00%7100.00%
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