drivers/net/ethernet/freescale/fec.h

/****************************************************************************/

/*
 *	fec.h  --  Fast Ethernet Controller for Motorola ColdFire SoC
 *		   processors.
 *
 *	(C) Copyright 2000-2005, Greg Ungerer (gerg@snapgear.com)
 *	(C) Copyright 2000-2001, Lineo (www.lineo.com)
 */

/****************************************************************************/
#ifndef FEC_H
#define	FEC_H
/****************************************************************************/

#include <linux/clocksource.h>
#include <linux/net_tstamp.h>
#include <linux/ptp_clock_kernel.h>

#if defined(CONFIG_M523x) || defined(CONFIG_M527x) || defined(CONFIG_M528x) || \
    defined(CONFIG_M520x) || defined(CONFIG_M532x) || \
    defined(CONFIG_ARCH_MXC) || defined(CONFIG_SOC_IMX28)
/*
 *	Just figures, Motorola would have to change the offsets for
 *	registers in the same peripheral device on different models
 *	of the ColdFire!
 */
#define FEC_IEVENT		0x004 /* Interrupt event reg */
#define FEC_IMASK		0x008 /* Interrupt mask reg */
#define FEC_R_DES_ACTIVE_0	0x010 /* Receive descriptor reg */
#define FEC_X_DES_ACTIVE_0	0x014 /* Transmit descriptor reg */
#define FEC_ECNTRL		0x024 /* Ethernet control reg */
#define FEC_MII_DATA		0x040 /* MII manage frame reg */
#define FEC_MII_SPEED		0x044 /* MII speed control reg */
#define FEC_MIB_CTRLSTAT	0x064 /* MIB control/status reg */
#define FEC_R_CNTRL		0x084 /* Receive control reg */
#define FEC_X_CNTRL		0x0c4 /* Transmit Control reg */
#define FEC_ADDR_LOW		0x0e4 /* Low 32bits MAC address */
#define FEC_ADDR_HIGH		0x0e8 /* High 16bits MAC address */
#define FEC_OPD			0x0ec /* Opcode + Pause duration */
#define FEC_HASH_TABLE_HIGH	0x118 /* High 32bits hash table */
#define FEC_HASH_TABLE_LOW	0x11c /* Low 32bits hash table */
#define FEC_GRP_HASH_TABLE_HIGH	0x120 /* High 32bits hash table */
#define FEC_GRP_HASH_TABLE_LOW	0x124 /* Low 32bits hash table */
#define FEC_X_WMRK		0x144 /* FIFO transmit water mark */
#define FEC_R_BOUND		0x14c /* FIFO receive bound reg */
#define FEC_R_FSTART		0x150 /* FIFO receive start reg */
#define FEC_R_DES_START_1	0x160 /* Receive descriptor ring 1 */
#define FEC_X_DES_START_1	0x164 /* Transmit descriptor ring 1 */
#define FEC_R_DES_START_2	0x16c /* Receive descriptor ring 2 */
#define FEC_X_DES_START_2	0x170 /* Transmit descriptor ring 2 */
#define FEC_R_DES_START_0	0x180 /* Receive descriptor ring */
#define FEC_X_DES_START_0	0x184 /* Transmit descriptor ring */
#define FEC_R_BUFF_SIZE		0x188 /* Maximum receive buff size */
#define FEC_R_FIFO_RSFL		0x190 /* Receive FIFO section full threshold */
#define FEC_R_FIFO_RSEM		0x194 /* Receive FIFO section empty threshold */
#define FEC_R_FIFO_RAEM		0x198 /* Receive FIFO almost empty threshold */
#define FEC_R_FIFO_RAFL		0x19c /* Receive FIFO almost full threshold */
#define FEC_RACC		0x1C4 /* Receive Accelerator function */
#define FEC_RCMR_1		0x1c8 /* Receive classification match ring 1 */
#define FEC_RCMR_2		0x1cc /* Receive classification match ring 2 */
#define FEC_DMA_CFG_1		0x1d8 /* DMA class configuration for ring 1 */
#define FEC_DMA_CFG_2		0x1dc /* DMA class Configuration for ring 2 */
#define FEC_R_DES_ACTIVE_1	0x1e0 /* Rx descriptor active for ring 1 */
#define FEC_X_DES_ACTIVE_1	0x1e4 /* Tx descriptor active for ring 1 */
#define FEC_R_DES_ACTIVE_2	0x1e8 /* Rx descriptor active for ring 2 */
#define FEC_X_DES_ACTIVE_2	0x1ec /* Tx descriptor active for ring 2 */
#define FEC_MIIGSK_CFGR		0x300 /* MIIGSK Configuration reg */
#define FEC_MIIGSK_ENR		0x308 /* MIIGSK Enable reg */

#define BM_MIIGSK_CFGR_MII		0x00
#define BM_MIIGSK_CFGR_RMII		0x01
#define BM_MIIGSK_CFGR_FRCONT_10M	0x40

#define RMON_T_DROP		0x200 /* Count of frames not cntd correctly */
#define RMON_T_PACKETS		0x204 /* RMON TX packet count */
#define RMON_T_BC_PKT		0x208 /* RMON TX broadcast pkts */
#define RMON_T_MC_PKT		0x20C /* RMON TX multicast pkts */
#define RMON_T_CRC_ALIGN	0x210 /* RMON TX pkts with CRC align err */
#define RMON_T_UNDERSIZE	0x214 /* RMON TX pkts < 64 bytes, good CRC */
#define RMON_T_OVERSIZE		0x218 /* RMON TX pkts > MAX_FL bytes good CRC */
#define RMON_T_FRAG		0x21C /* RMON TX pkts < 64 bytes, bad CRC */
#define RMON_T_JAB		0x220 /* RMON TX pkts > MAX_FL bytes, bad CRC */
#define RMON_T_COL		0x224 /* RMON TX collision count */
#define RMON_T_P64		0x228 /* RMON TX 64 byte pkts */
#define RMON_T_P65TO127		0x22C /* RMON TX 65 to 127 byte pkts */
#define RMON_T_P128TO255	0x230 /* RMON TX 128 to 255 byte pkts */
#define RMON_T_P256TO511	0x234 /* RMON TX 256 to 511 byte pkts */
#define RMON_T_P512TO1023	0x238 /* RMON TX 512 to 1023 byte pkts */
#define RMON_T_P1024TO2047	0x23C /* RMON TX 1024 to 2047 byte pkts */
#define RMON_T_P_GTE2048	0x240 /* RMON TX pkts > 2048 bytes */
#define RMON_T_OCTETS		0x244 /* RMON TX octets */
#define IEEE_T_DROP		0x248 /* Count of frames not counted crtly */
#define IEEE_T_FRAME_OK		0x24C /* Frames tx'd OK */
#define IEEE_T_1COL		0x250 /* Frames tx'd with single collision */
#define IEEE_T_MCOL		0x254 /* Frames tx'd with multiple collision */
#define IEEE_T_DEF		0x258 /* Frames tx'd after deferral delay */
#define IEEE_T_LCOL		0x25C /* Frames tx'd with late collision */
#define IEEE_T_EXCOL		0x260 /* Frames tx'd with excesv collisions */
#define IEEE_T_MACERR		0x264 /* Frames tx'd with TX FIFO underrun */
#define IEEE_T_CSERR		0x268 /* Frames tx'd with carrier sense err */
#define IEEE_T_SQE		0x26C /* Frames tx'd with SQE err */
#define IEEE_T_FDXFC		0x270 /* Flow control pause frames tx'd */
#define IEEE_T_OCTETS_OK	0x274 /* Octet count for frames tx'd w/o err */
#define RMON_R_PACKETS		0x284 /* RMON RX packet count */
#define RMON_R_BC_PKT		0x288 /* RMON RX broadcast pkts */
#define RMON_R_MC_PKT		0x28C /* RMON RX multicast pkts */
#define RMON_R_CRC_ALIGN	0x290 /* RMON RX pkts with CRC alignment err */
#define RMON_R_UNDERSIZE	0x294 /* RMON RX pkts < 64 bytes, good CRC */
#define RMON_R_OVERSIZE		0x298 /* RMON RX pkts > MAX_FL bytes good CRC */
#define RMON_R_FRAG		0x29C /* RMON RX pkts < 64 bytes, bad CRC */
#define RMON_R_JAB		0x2A0 /* RMON RX pkts > MAX_FL bytes, bad CRC */
#define RMON_R_RESVD_O		0x2A4 /* Reserved */
#define RMON_R_P64		0x2A8 /* RMON RX 64 byte pkts */
#define RMON_R_P65TO127		0x2AC /* RMON RX 65 to 127 byte pkts */
#define RMON_R_P128TO255	0x2B0 /* RMON RX 128 to 255 byte pkts */
#define RMON_R_P256TO511	0x2B4 /* RMON RX 256 to 511 byte pkts */
#define RMON_R_P512TO1023	0x2B8 /* RMON RX 512 to 1023 byte pkts */
#define RMON_R_P1024TO2047	0x2BC /* RMON RX 1024 to 2047 byte pkts */
#define RMON_R_P_GTE2048	0x2C0 /* RMON RX pkts > 2048 bytes */
#define RMON_R_OCTETS		0x2C4 /* RMON RX octets */
#define IEEE_R_DROP		0x2C8 /* Count frames not counted correctly */
#define IEEE_R_FRAME_OK		0x2CC /* Frames rx'd OK */
#define IEEE_R_CRC		0x2D0 /* Frames rx'd with CRC err */
#define IEEE_R_ALIGN		0x2D4 /* Frames rx'd with alignment err */
#define IEEE_R_MACERR		0x2D8 /* Receive FIFO overflow count */
#define IEEE_R_FDXFC		0x2DC /* Flow control pause frames rx'd */
#define IEEE_R_OCTETS_OK	0x2E0 /* Octet cnt for frames rx'd w/o err */

#else

#define FEC_ECNTRL		0x000 /* Ethernet control reg */
#define FEC_IEVENT		0x004 /* Interrupt even reg */
#define FEC_IMASK		0x008 /* Interrupt mask reg */
#define FEC_IVEC		0x00c /* Interrupt vec status reg */
#define FEC_R_DES_ACTIVE	0x010 /* Receive descriptor reg */
#define FEC_X_DES_ACTIVE	0x014 /* Transmit descriptor reg */
#define FEC_MII_DATA		0x040 /* MII manage frame reg */
#define FEC_MII_SPEED		0x044 /* MII speed control reg */
#define FEC_R_BOUND		0x08c /* FIFO receive bound reg */
#define FEC_R_FSTART		0x090 /* FIFO receive start reg */
#define FEC_X_WMRK		0x0a4 /* FIFO transmit water mark */
#define FEC_X_FSTART		0x0ac /* FIFO transmit start reg */
#define FEC_R_CNTRL		0x104 /* Receive control reg */
#define FEC_MAX_FRM_LEN		0x108 /* Maximum frame length reg */
#define FEC_X_CNTRL		0x144 /* Transmit Control reg */
#define FEC_ADDR_LOW		0x3c0 /* Low 32bits MAC address */
#define FEC_ADDR_HIGH		0x3c4 /* High 16bits MAC address */
#define FEC_GRP_HASH_TABLE_HIGH	0x3c8 /* High 32bits hash table */
#define FEC_GRP_HASH_TABLE_LOW	0x3cc /* Low 32bits hash table */
#define FEC_R_DES_START		0x3d0 /* Receive descriptor ring */
#define FEC_X_DES_START		0x3d4 /* Transmit descriptor ring */
#define FEC_R_BUFF_SIZE		0x3d8 /* Maximum receive buff size */
#define FEC_FIFO_RAM		0x400 /* FIFO RAM buffer */

#endif /* CONFIG_M5272 */


/*
 *	Define the buffer descriptor structure.
 */
#if defined(CONFIG_ARCH_MXC) || defined(CONFIG_SOC_IMX28)
struct bufdesc {
	unsigned short cbd_datlen;	/* Data length */
	unsigned short cbd_sc;	/* Control and status info */
	unsigned long cbd_bufaddr;	/* Buffer address */
};
#else
struct bufdesc {
	unsigned short	cbd_sc;			/* Control and status info */
	unsigned short	cbd_datlen;		/* Data length */
	unsigned long	cbd_bufaddr;		/* Buffer address */
};
#endif

struct bufdesc_ex {
	struct bufdesc desc;
	unsigned long cbd_esc;
	unsigned long cbd_prot;
	unsigned long cbd_bdu;
	unsigned long ts;
	unsigned short res0[4];
};

/*
 *	The following definitions courtesy of commproc.h, which where
 *	Copyright (c) 1997 Dan Malek (dmalek@jlc.net).
 */
#define BD_SC_EMPTY     ((ushort)0x8000)        /* Receive is empty */
#define BD_SC_READY     ((ushort)0x8000)        /* Transmit is ready */
#define BD_SC_WRAP      ((ushort)0x2000)        /* Last buffer descriptor */
#define BD_SC_INTRPT    ((ushort)0x1000)        /* Interrupt on change */
#define BD_SC_CM        ((ushort)0x0200)        /* Continuous mode */
#define BD_SC_ID        ((ushort)0x0100)        /* Rec'd too many idles */
#define BD_SC_P         ((ushort)0x0100)        /* xmt preamble */
#define BD_SC_BR        ((ushort)0x0020)        /* Break received */
#define BD_SC_FR        ((ushort)0x0010)        /* Framing error */
#define BD_SC_PR        ((ushort)0x0008)        /* Parity error */
#define BD_SC_OV        ((ushort)0x0002)        /* Overrun */
#define BD_SC_CD        ((ushort)0x0001)        /* ?? */

/* Buffer descriptor control/status used by Ethernet receive.
*/
#define BD_ENET_RX_EMPTY        ((ushort)0x8000)
#define BD_ENET_RX_WRAP         ((ushort)0x2000)
#define BD_ENET_RX_INTR         ((ushort)0x1000)
#define BD_ENET_RX_LAST         ((ushort)0x0800)
#define BD_ENET_RX_FIRST        ((ushort)0x0400)
#define BD_ENET_RX_MISS         ((ushort)0x0100)
#define BD_ENET_RX_LG           ((ushort)0x0020)
#define BD_ENET_RX_NO           ((ushort)0x0010)
#define BD_ENET_RX_SH           ((ushort)0x0008)
#define BD_ENET_RX_CR           ((ushort)0x0004)
#define BD_ENET_RX_OV           ((ushort)0x0002)
#define BD_ENET_RX_CL           ((ushort)0x0001)
#define BD_ENET_RX_STATS        ((ushort)0x013f)        /* All status bits */

/* Enhanced buffer descriptor control/status used by Ethernet receive */
#define BD_ENET_RX_VLAN         0x00000004

/* Buffer descriptor control/status used by Ethernet transmit.
*/
#define BD_ENET_TX_READY        ((ushort)0x8000)
#define BD_ENET_TX_PAD          ((ushort)0x4000)
#define BD_ENET_TX_WRAP         ((ushort)0x2000)
#define BD_ENET_TX_INTR         ((ushort)0x1000)
#define BD_ENET_TX_LAST         ((ushort)0x0800)
#define BD_ENET_TX_TC           ((ushort)0x0400)
#define BD_ENET_TX_DEF          ((ushort)0x0200)
#define BD_ENET_TX_HB           ((ushort)0x0100)
#define BD_ENET_TX_LC           ((ushort)0x0080)
#define BD_ENET_TX_RL           ((ushort)0x0040)
#define BD_ENET_TX_RCMASK       ((ushort)0x003c)
#define BD_ENET_TX_UN           ((ushort)0x0002)
#define BD_ENET_TX_CSL          ((ushort)0x0001)
#define BD_ENET_TX_STATS        ((ushort)0x0fff)        /* All status bits */

/*enhanced buffer descriptor control/status used by Ethernet transmit*/
#define BD_ENET_TX_INT          0x40000000
#define BD_ENET_TX_TS           0x20000000
#define BD_ENET_TX_PINS         0x10000000
#define BD_ENET_TX_IINS         0x08000000


/* This device has up to three irqs on some platforms */
#define FEC_IRQ_NUM		3

/* Maximum number of queues supported
 * ENET with AVB IP can support up to 3 independent tx queues and rx queues.
 * User can point the queue number that is less than or equal to 3.
 */
#define FEC_ENET_MAX_TX_QS	3
#define FEC_ENET_MAX_RX_QS	3

#define FEC_R_DES_START(X)	((X == 1) ? FEC_R_DES_START_1 : \
				((X == 2) ? \
					FEC_R_DES_START_2 : FEC_R_DES_START_0))
#define FEC_X_DES_START(X)	((X == 1) ? FEC_X_DES_START_1 : \
				((X == 2) ? \
					FEC_X_DES_START_2 : FEC_X_DES_START_0))
#define FEC_R_DES_ACTIVE(X)	((X == 1) ? FEC_R_DES_ACTIVE_1 : \
				((X == 2) ? \
				   FEC_R_DES_ACTIVE_2 : FEC_R_DES_ACTIVE_0))
#define FEC_X_DES_ACTIVE(X)	((X == 1) ? FEC_X_DES_ACTIVE_1 : \
				((X == 2) ? \
				   FEC_X_DES_ACTIVE_2 : FEC_X_DES_ACTIVE_0))

#define FEC_DMA_CFG(X)		((X == 2) ? FEC_DMA_CFG_2 : FEC_DMA_CFG_1)

#define DMA_CLASS_EN		(1 << 16)
#define FEC_RCMR(X)		((X == 2) ? FEC_RCMR_2 : FEC_RCMR_1)
#define IDLE_SLOPE_MASK		0xFFFF
#define IDLE_SLOPE_1		0x200 /* BW fraction: 0.5 */
#define IDLE_SLOPE_2		0x200 /* BW fraction: 0.5 */
#define IDLE_SLOPE(X)		((X == 1) ? (IDLE_SLOPE_1 & IDLE_SLOPE_MASK) : \
				(IDLE_SLOPE_2 & IDLE_SLOPE_MASK))
#define RCMR_MATCHEN            (0x1 << 16)
#define RCMR_CMP_CFG(v, n)	((v & 0x7) <<  (n << 2))
#define RCMR_CMP_1		(RCMR_CMP_CFG(0, 0) | RCMR_CMP_CFG(1, 1) | \
				RCMR_CMP_CFG(2, 2) | RCMR_CMP_CFG(3, 3))
#define RCMR_CMP_2		(RCMR_CMP_CFG(4, 0) | RCMR_CMP_CFG(5, 1) | \
				RCMR_CMP_CFG(6, 2) | RCMR_CMP_CFG(7, 3))
#define RCMR_CMP(X)		((X == 1) ? RCMR_CMP_1 : RCMR_CMP_2)

/* The number of Tx and Rx buffers.  These are allocated from the page
 * pool.  The code may assume these are power of two, so it it best
 * to keep them that size.
 * We don't need to allocate pages for the transmitter.  We just use
 * the skbuffer directly.
 */

#define FEC_ENET_RX_PAGES	8
#define FEC_ENET_RX_FRSIZE	2048
#define FEC_ENET_RX_FRPPG	(PAGE_SIZE / FEC_ENET_RX_FRSIZE)
#define RX_RING_SIZE		(FEC_ENET_RX_FRPPG * FEC_ENET_RX_PAGES)
#define FEC_ENET_TX_FRSIZE	2048
#define FEC_ENET_TX_FRPPG	(PAGE_SIZE / FEC_ENET_TX_FRSIZE)
#define TX_RING_SIZE		512	/* Must be power of two */
#define TX_RING_MOD_MASK	511	/*   for this to work */

#define BD_ENET_RX_INT          0x00800000
#define BD_ENET_RX_PTP          ((ushort)0x0400)
#define BD_ENET_RX_ICE		0x00000020
#define BD_ENET_RX_PCR		0x00000010
#define FLAG_RX_CSUM_ENABLED	(BD_ENET_RX_ICE | BD_ENET_RX_PCR)
#define FLAG_RX_CSUM_ERROR	(BD_ENET_RX_ICE | BD_ENET_RX_PCR)

struct fec_enet_priv_tx_q {
	int index;
	unsigned char *tx_bounce[TX_RING_SIZE];
	struct  sk_buff *tx_skbuff[TX_RING_SIZE];

	dma_addr_t	bd_dma;
	struct bufdesc	*tx_bd_base;
	uint tx_ring_size;

	unsigned short tx_stop_threshold;
	unsigned short tx_wake_threshold;

	struct bufdesc	*cur_tx;
	struct bufdesc	*dirty_tx;
	char *tso_hdrs;
	dma_addr_t tso_hdrs_dma;
};

struct fec_enet_priv_rx_q {
	int index;
	struct  sk_buff *rx_skbuff[RX_RING_SIZE];

	dma_addr_t	bd_dma;
	struct bufdesc	*rx_bd_base;
	uint rx_ring_size;

	struct bufdesc	*cur_rx;
};

/* The FEC buffer descriptors track the ring buffers.  The rx_bd_base and
 * tx_bd_base always point to the base of the buffer descriptors.  The
 * cur_rx and cur_tx point to the currently available buffer.
 * The dirty_tx tracks the current buffer that is being sent by the
 * controller.  The cur_tx and dirty_tx are equal under both completely
 * empty and completely full conditions.  The empty/ready indicator in
 * the buffer descriptor determines the actual condition.
 */
struct fec_enet_private {
	/* Hardware registers of the FEC device */
	void __iomem *hwp;

	struct net_device *netdev;

	struct clk *clk_ipg;
	struct clk *clk_ahb;
	struct clk *clk_ref;
	struct clk *clk_enet_out;
	struct clk *clk_ptp;

	bool ptp_clk_on;
	struct mutex ptp_clk_mutex;

	/* The saved address of a sent-in-place packet/buffer, for skfree(). */
	struct fec_enet_priv_tx_q *tx_queue[FEC_ENET_MAX_TX_QS];
	struct fec_enet_priv_rx_q *rx_queue[FEC_ENET_MAX_RX_QS];

	unsigned int total_tx_ring_size;
	unsigned int total_rx_ring_size;

	unsigned long work_tx;
	unsigned long work_rx;
	unsigned long work_ts;
	unsigned long work_mdio;

	unsigned short bufdesc_size;

	struct	platform_device *pdev;

	int	dev_id;

	/* Phylib and MDIO interface */
	struct	mii_bus *mii_bus;
	struct	phy_device *phy_dev;
	int	mii_timeout;
	uint	phy_speed;
	phy_interface_t	phy_interface;
	struct device_node *phy_node;
	int	link;
	int	full_duplex;
	int	speed;
	struct	completion mdio_done;
	int	irq[FEC_IRQ_NUM];
	int	bufdesc_ex;
	int	pause_flag;

	struct	napi_struct napi;
	int	csum_flags;

	struct work_struct tx_timeout_work;

	struct ptp_clock *ptp_clock;
	struct ptp_clock_info ptp_caps;
	unsigned long last_overflow_check;
	spinlock_t tmreg_lock;
	struct cyclecounter cc;
	struct timecounter tc;
	int rx_hwtstamp_filter;
	u32 base_incval;
	u32 cycle_speed;
	int hwts_rx_en;
	int hwts_tx_en;
	struct delayed_work time_keep;
	struct regulator *reg_phy;
};

void fec_ptp_init(struct platform_device *pdev);
void fec_ptp_start_cyclecounter(struct net_device *ndev);
int fec_ptp_set(struct net_device *ndev, struct ifreq *ifr);
int fec_ptp_get(struct net_device *ndev, struct ifreq *ifr);

/****************************************************************************/
#endif /* FEC_H */