/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _NB8800_H_
#define _NB8800_H_

#include <linux/types.h>
#include <linux/skbuff.h>
#include <linux/phy.h>
#include <linux/clk.h>
#include <linux/bitops.h>

#define RX_DESC_COUNT			256
#define TX_DESC_COUNT			256

#define NB8800_DESC_LOW			4

#define RX_BUF_SIZE			1552

#define RX_COPYBREAK			256
#define RX_COPYHDR			128

#define MAX_MDC_CLOCK			2500000

/* Stargate Solutions SSN8800 core registers */
#define NB8800_TX_CTL1			0x000
#define TX_TPD				BIT(5)
#define TX_APPEND_FCS			BIT(4)
#define TX_PAD_EN			BIT(3)
#define TX_RETRY_EN			BIT(2)
#define TX_EN				BIT(0)

#define NB8800_TX_CTL2			0x001

#define NB8800_RX_CTL			0x004
#define RX_BC_DISABLE			BIT(7)
#define RX_RUNT				BIT(6)
#define RX_AF_EN			BIT(5)
#define RX_PAUSE_EN			BIT(3)
#define RX_SEND_CRC			BIT(2)
#define RX_PAD_STRIP			BIT(1)
#define RX_EN				BIT(0)

#define NB8800_RANDOM_SEED		0x008
#define NB8800_TX_SDP			0x14
#define NB8800_TX_TPDP1			0x18
#define NB8800_TX_TPDP2			0x19
#define NB8800_SLOT_TIME		0x1c

#define NB8800_MDIO_CMD			0x020
#define MDIO_CMD_GO			BIT(31)
#define MDIO_CMD_WR			BIT(26)
#define MDIO_CMD_ADDR(x)		((x) << 21)
#define MDIO_CMD_REG(x)			((x) << 16)
#define MDIO_CMD_DATA(x)		((x) <<	 0)

#define NB8800_MDIO_STS			0x024
#define MDIO_STS_ERR			BIT(31)

#define NB8800_MC_ADDR(i)		(0x028 + (i))
#define NB8800_MC_INIT			0x02e
#define NB8800_UC_ADDR(i)		(0x03c + (i))

#define NB8800_MAC_MODE			0x044
#define RGMII_MODE			BIT(7)
#define HALF_DUPLEX			BIT(4)
#define BURST_EN			BIT(3)
#define LOOPBACK_EN			BIT(2)
#define GMAC_MODE			BIT(0)

#define NB8800_IC_THRESHOLD		0x050
#define NB8800_PE_THRESHOLD		0x051
#define NB8800_PF_THRESHOLD		0x052
#define NB8800_TX_BUFSIZE		0x054
#define NB8800_FIFO_CTL			0x056
#define NB8800_PQ1			0x060
#define NB8800_PQ2			0x061
#define NB8800_SRC_ADDR(i)		(0x06a + (i))
#define NB8800_STAT_DATA		0x078
#define NB8800_STAT_INDEX		0x07c
#define NB8800_STAT_CLEAR		0x07d

#define NB8800_SLEEP_MODE		0x07e
#define SLEEP_MODE			BIT(0)

#define NB8800_WAKEUP			0x07f
#define WAKEUP				BIT(0)

/* Aurora NB8800 host interface registers */
#define NB8800_TXC_CR			0x100
#define TCR_LK				BIT(12)
#define TCR_DS				BIT(11)
#define TCR_BTS(x)			(((x) & 0x7) << 8)
#define TCR_DIE				BIT(7)
#define TCR_TFI(x)			(((x) & 0x7) << 4)
#define TCR_LE				BIT(3)
#define TCR_RS				BIT(2)
#define TCR_DM				BIT(1)
#define TCR_EN				BIT(0)

#define NB8800_TXC_SR			0x104
#define TSR_DE				BIT(3)
#define TSR_DI				BIT(2)
#define TSR_TO				BIT(1)
#define TSR_TI				BIT(0)

#define NB8800_TX_SAR			0x108
#define NB8800_TX_DESC_ADDR		0x10c

#define NB8800_TX_REPORT_ADDR		0x110
#define TX_BYTES_TRANSFERRED(x)		(((x) >> 16) & 0xffff)
#define TX_FIRST_DEFERRAL		BIT(7)
#define TX_EARLY_COLLISIONS(x)		(((x) >> 3) & 0xf)
#define TX_LATE_COLLISION		BIT(2)
#define TX_PACKET_DROPPED		BIT(1)
#define TX_FIFO_UNDERRUN		BIT(0)
#define IS_TX_ERROR(r)			((r) & 0x07)

#define NB8800_TX_FIFO_SR		0x114
#define NB8800_TX_ITR			0x118

#define NB8800_RXC_CR			0x200
#define RCR_FL				BIT(13)
#define RCR_LK				BIT(12)
#define RCR_DS				BIT(11)
#define RCR_BTS(x)			(((x) & 7) << 8)
#define RCR_DIE				BIT(7)
#define RCR_RFI(x)			(((x) & 7) << 4)
#define RCR_LE				BIT(3)
#define RCR_RS				BIT(2)
#define RCR_DM				BIT(1)
#define RCR_EN				BIT(0)

#define NB8800_RXC_SR			0x204
#define RSR_DE				BIT(3)
#define RSR_DI				BIT(2)
#define RSR_RO				BIT(1)
#define RSR_RI				BIT(0)

#define NB8800_RX_SAR			0x208
#define NB8800_RX_DESC_ADDR		0x20c

#define NB8800_RX_REPORT_ADDR		0x210
#define RX_BYTES_TRANSFERRED(x)		(((x) >> 16) & 0xFFFF)
#define RX_MULTICAST_PKT		BIT(9)
#define RX_BROADCAST_PKT		BIT(8)
#define RX_LENGTH_ERR			BIT(7)
#define RX_FCS_ERR			BIT(6)
#define RX_RUNT_PKT			BIT(5)
#define RX_FIFO_OVERRUN			BIT(4)
#define RX_LATE_COLLISION		BIT(3)
#define RX_ALIGNMENT_ERROR		BIT(2)
#define RX_ERROR_MASK			0xfc
#define IS_RX_ERROR(r)			((r) & RX_ERROR_MASK)

#define NB8800_RX_FIFO_SR		0x214
#define NB8800_RX_ITR			0x218

/* Sigma Designs SMP86xx additional registers */
#define NB8800_TANGOX_PAD_MODE		0x400
#define PAD_MODE_MASK			0x7
#define PAD_MODE_MII			0x0
#define PAD_MODE_RGMII			0x1
#define PAD_MODE_GTX_CLK_INV		BIT(3)
#define PAD_MODE_GTX_CLK_DELAY		BIT(4)

#define NB8800_TANGOX_MDIO_CLKDIV	0x420
#define NB8800_TANGOX_RESET		0x424

/* Hardware DMA descriptor */
struct nb8800_dma_desc {
	u32				s_addr;	/* start address */
	u32				n_addr;	/* next descriptor address */
	u32				r_addr;	/* report address */
	u32				config;
} __aligned(8);

#define DESC_ID				BIT(23)
#define DESC_EOC			BIT(22)
#define DESC_EOF			BIT(21)
#define DESC_LK				BIT(20)
#define DESC_DS				BIT(19)
#define DESC_BTS(x)			(((x) & 0x7) << 16)

/* DMA descriptor and associated data for rx.
 * Allocated from coherent memory.
 */
struct nb8800_rx_desc {
	/* DMA descriptor */
	struct nb8800_dma_desc		desc;

	/* Status report filled in by hardware */
	u32				report;
};

/* Address of buffer on rx ring */
struct nb8800_rx_buf {
	struct page			*page;
	unsigned long			offset;
};

/* DMA descriptors and associated data for tx.
 * Allocated from coherent memory.
 */
struct nb8800_tx_desc {
	/* DMA descriptor.  The second descriptor is used if packet
	 * data is unaligned.
	 */
	struct nb8800_dma_desc		desc[2];

	/* Status report filled in by hardware */
	u32				report;

	/* Bounce buffer for initial unaligned part of packet */
	u8				buf[8] __aligned(8);
};

/* Packet in tx queue */
struct nb8800_tx_buf {
	/* Currently queued skb */
	struct sk_buff			*skb;

	/* DMA address of the first descriptor */
	dma_addr_t			dma_desc;

	/* DMA address of packet data */
	dma_addr_t			dma_addr;

	/* Length of DMA mapping, less than skb->len if alignment
	 * buffer is used.
	 */
	unsigned int			dma_len;

	/* Number of packets in chain starting here */
	unsigned int			chain_len;

	/* Packet chain ready to be submitted to hardware */
	bool				ready;
};

struct nb8800_priv {
	struct napi_struct		napi;

	void __iomem			*base;

	/* RX DMA descriptors */
	struct nb8800_rx_desc		*rx_descs;

	/* RX buffers referenced by DMA descriptors */
	struct nb8800_rx_buf		*rx_bufs;

	/* Current end of chain */
	u32				rx_eoc;

	/* Value for rx interrupt time register in NAPI interrupt mode */
	u32				rx_itr_irq;

	/* Value for rx interrupt time register in NAPI poll mode */
	u32				rx_itr_poll;

	/* Value for config field of rx DMA descriptors */
	u32				rx_dma_config;

	/* TX DMA descriptors */
	struct nb8800_tx_desc		*tx_descs;

	/* TX packet queue */
	struct nb8800_tx_buf		*tx_bufs;

	/* Number of free tx queue entries */
	atomic_t			tx_free;

	/* First free tx queue entry */
	u32				tx_next;

	/* Next buffer to transmit */
	u32				tx_queue;

	/* Start of current packet chain */
	struct nb8800_tx_buf		*tx_chain;

	/* Next buffer to reclaim */
	u32				tx_done;

	/* Lock for DMA activation */
	spinlock_t			tx_lock;

	struct mii_bus			*mii_bus;
	struct device_node		*phy_node;

	/* PHY connection type from DT */
	phy_interface_t			phy_mode;

	/* Current link status */
	int				speed;
	int				duplex;
	int				link;

	/* Pause settings */
	bool				pause_aneg;
	bool				pause_rx;
	bool				pause_tx;

	/* DMA base address of rx descriptors, see rx_descs above */
	dma_addr_t			rx_desc_dma;

	/* DMA base address of tx descriptors, see tx_descs above */
	dma_addr_t			tx_desc_dma;

	struct clk			*clk;
};

struct nb8800_ops {
	int				(*init)(struct net_device *dev);
	int				(*reset)(struct net_device *dev);
};

#endif /* _NB8800_H_ */