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

  Intel PRO/1000 Linux driver
  Copyright(c) 1999 - 2013 Intel Corporation.

  This program is free software; you can redistribute it and/or modify it
  under the terms and conditions of the GNU General Public License,
  version 2, as published by the Free Software Foundation.

  This program is distributed in the hope it will be useful, but WITHOUT
  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  more details.

  You should have received a copy of the GNU General Public License along with
  this program; if not, write to the Free Software Foundation, Inc.,
  51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.

  The full GNU General Public License is included in this distribution in
  the file called "COPYING".

  Contact Information:
  Linux NICS <linux.nics@intel.com>
  e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
  Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497

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

/* Linux PRO/1000 Ethernet Driver main header file */

#ifndef _E1000_H_
#define _E1000_H_

#include <linux/bitops.h>
#include <linux/types.h>
#include <linux/timer.h>
#include <linux/workqueue.h>
#include <linux/io.h>
#include <linux/netdevice.h>
#include <linux/pci.h>
#include <linux/pci-aspm.h>
#include <linux/crc32.h>
#include <linux/if_vlan.h>
#include <linux/clocksource.h>
#include <linux/net_tstamp.h>
#include <linux/ptp_clock_kernel.h>
#include <linux/ptp_classify.h>
#include <linux/mii.h>
#include "hw.h"

struct e1000_info;

#define e_dbg(format, arg...) \
	netdev_dbg(hw->adapter->netdev, format, ## arg)
#define e_err(format, arg...) \
	netdev_err(adapter->netdev, format, ## arg)
#define e_info(format, arg...) \
	netdev_info(adapter->netdev, format, ## arg)
#define e_warn(format, arg...) \
	netdev_warn(adapter->netdev, format, ## arg)
#define e_notice(format, arg...) \
	netdev_notice(adapter->netdev, format, ## arg)


/* Interrupt modes, as used by the IntMode parameter */
#define E1000E_INT_MODE_LEGACY		0
#define E1000E_INT_MODE_MSI		1
#define E1000E_INT_MODE_MSIX		2

/* Tx/Rx descriptor defines */
#define E1000_DEFAULT_TXD		256
#define E1000_MAX_TXD			4096
#define E1000_MIN_TXD			64

#define E1000_DEFAULT_RXD		256
#define E1000_MAX_RXD			4096
#define E1000_MIN_RXD			64

#define E1000_MIN_ITR_USECS		10 /* 100000 irq/sec */
#define E1000_MAX_ITR_USECS		10000 /* 100    irq/sec */

#define E1000_FC_PAUSE_TIME		0x0680 /* 858 usec */

/* How many Tx Descriptors do we need to call netif_wake_queue ? */
/* How many Rx Buffers do we bundle into one write to the hardware ? */
#define E1000_RX_BUFFER_WRITE		16 /* Must be power of 2 */

#define AUTO_ALL_MODES			0
#define E1000_EEPROM_APME		0x0400

#define E1000_MNG_VLAN_NONE		(-1)

/* Number of packet split data buffers (not including the header buffer) */
#define PS_PAGE_BUFFERS			(MAX_PS_BUFFERS - 1)

#define DEFAULT_JUMBO			9234

/* Time to wait before putting the device into D3 if there's no link (in ms). */
#define LINK_TIMEOUT		100

/* Count for polling __E1000_RESET condition every 10-20msec.
 * Experimentation has shown the reset can take approximately 210msec.
 */
#define E1000_CHECK_RESET_COUNT		25

#define DEFAULT_RDTR			0
#define DEFAULT_RADV			8
#define BURST_RDTR			0x20
#define BURST_RADV			0x20

/* in the case of WTHRESH, it appears at least the 82571/2 hardware
 * writes back 4 descriptors when WTHRESH=5, and 3 descriptors when
 * WTHRESH=4, so a setting of 5 gives the most efficient bus
 * utilization but to avoid possible Tx stalls, set it to 1
 */
#define E1000_TXDCTL_DMA_BURST_ENABLE                          \
	(E1000_TXDCTL_GRAN | /* set descriptor granularity */  \
	 E1000_TXDCTL_COUNT_DESC |                             \
	 (1 << 16) | /* wthresh must be +1 more than desired */\
	 (1 << 8)  | /* hthresh */                             \
	 0x1f)       /* pthresh */

#define E1000_RXDCTL_DMA_BURST_ENABLE                          \
	(0x01000000 | /* set descriptor granularity */         \
	 (4 << 16)  | /* set writeback threshold    */         \
	 (4 << 8)   | /* set prefetch threshold     */         \
	 0x20)        /* set hthresh                */

#define E1000_TIDV_FPD (1 << 31)
#define E1000_RDTR_FPD (1 << 31)

enum e1000_boards {
	board_82571,
	board_82572,
	board_82573,
	board_82574,
	board_82583,
	board_80003es2lan,
	board_ich8lan,
	board_ich9lan,
	board_ich10lan,
	board_pchlan,
	board_pch2lan,
	board_pch_lpt,
};

struct e1000_ps_page {
	struct page *page;
	u64 dma; /* must be u64 - written to hw */
};

/* wrappers around a pointer to a socket buffer,
 * so a DMA handle can be stored along with the buffer
 */
struct e1000_buffer {
	dma_addr_t dma;
	struct sk_buff *skb;
	union {
		/* Tx */
		struct {
			unsigned long time_stamp;
			u16 length;
			u16 next_to_watch;
			unsigned int segs;
			unsigned int bytecount;
			u16 mapped_as_page;
		};
		/* Rx */
		struct {
			/* arrays of page information for packet split */
			struct e1000_ps_page *ps_pages;
			struct page *page;
		};
	};
};

struct e1000_ring {
	struct e1000_adapter *adapter;	/* back pointer to adapter */
	void *desc;			/* pointer to ring memory  */
	dma_addr_t dma;			/* phys address of ring    */
	unsigned int size;		/* length of ring in bytes */
	unsigned int count;		/* number of desc. in ring */

	u16 next_to_use;
	u16 next_to_clean;

	void __iomem *head;
	void __iomem *tail;

	/* array of buffer information structs */
	struct e1000_buffer *buffer_info;

	char name[IFNAMSIZ + 5];
	u32 ims_val;
	u32 itr_val;
	void __iomem *itr_register;
	int set_itr;

	struct sk_buff *rx_skb_top;
};

/* PHY register snapshot values */
struct e1000_phy_regs {
	u16 bmcr;		/* basic mode control register    */
	u16 bmsr;		/* basic mode status register     */
	u16 advertise;		/* auto-negotiation advertisement */
	u16 lpa;		/* link partner ability register  */
	u16 expansion;		/* auto-negotiation expansion reg */
	u16 ctrl1000;		/* 1000BASE-T control register    */
	u16 stat1000;		/* 1000BASE-T status register     */
	u16 estatus;		/* extended status register       */
};

/* board specific private data structure */
struct e1000_adapter {
	struct timer_list watchdog_timer;
	struct timer_list phy_info_timer;
	struct timer_list blink_timer;

	struct work_struct reset_task;
	struct work_struct watchdog_task;

	const struct e1000_info *ei;

	unsigned long active_vlans[BITS_TO_LONGS(VLAN_N_VID)];
	u32 bd_number;
	u32 rx_buffer_len;
	u16 mng_vlan_id;
	u16 link_speed;
	u16 link_duplex;
	u16 eeprom_vers;

	/* track device up/down/testing state */
	unsigned long state;

	/* Interrupt Throttle Rate */
	u32 itr;
	u32 itr_setting;
	u16 tx_itr;
	u16 rx_itr;

	/* Tx */
	struct e1000_ring *tx_ring /* One per active queue */
						____cacheline_aligned_in_smp;
	u32 tx_fifo_limit;

	struct napi_struct napi;

	unsigned int uncorr_errors;	/* uncorrectable ECC errors */
	unsigned int corr_errors;	/* correctable ECC errors */
	unsigned int restart_queue;
	u32 txd_cmd;

	bool detect_tx_hung;
	bool tx_hang_recheck;
	u8 tx_timeout_factor;

	u32 tx_int_delay;
	u32 tx_abs_int_delay;

	unsigned int total_tx_bytes;
	unsigned int total_tx_packets;
	unsigned int total_rx_bytes;
	unsigned int total_rx_packets;

	/* Tx stats */
	u64 tpt_old;
	u64 colc_old;
	u32 gotc;
	u64 gotc_old;
	u32 tx_timeout_count;
	u32 tx_fifo_head;
	u32 tx_head_addr;
	u32 tx_fifo_size;
	u32 tx_dma_failed;

	/* Rx */
	bool (*clean_rx) (struct e1000_ring *ring, int *work_done,
			  int work_to_do) ____cacheline_aligned_in_smp;
	void (*alloc_rx_buf) (struct e1000_ring *ring, int cleaned_count,
			      gfp_t gfp);
	struct e1000_ring *rx_ring;

	u32 rx_int_delay;
	u32 rx_abs_int_delay;

	/* Rx stats */
	u64 hw_csum_err;
	u64 hw_csum_good;
	u64 rx_hdr_split;
	u32 gorc;
	u64 gorc_old;
	u32 alloc_rx_buff_failed;
	u32 rx_dma_failed;
	u32 rx_hwtstamp_cleared;

	unsigned int rx_ps_pages;
	u16 rx_ps_bsize0;
	u32 max_frame_size;
	u32 min_frame_size;

	/* OS defined structs */
	struct net_device *netdev;
	struct pci_dev *pdev;

	/* structs defined in e1000_hw.h */
	struct e1000_hw hw;

	spinlock_t stats64_lock;	/* protects statistics counters */
	struct e1000_hw_stats stats;
	struct e1000_phy_info phy_info;
	struct e1000_phy_stats phy_stats;

	/* Snapshot of PHY registers */
	struct e1000_phy_regs phy_regs;

	struct e1000_ring test_tx_ring;
	struct e1000_ring test_rx_ring;
	u32 test_icr;

	u32 msg_enable;
	unsigned int num_vectors;
	struct msix_entry *msix_entries;
	int int_mode;
	u32 eiac_mask;

	u32 eeprom_wol;
	u32 wol;
	u32 pba;
	u32 max_hw_frame_size;

	bool fc_autoneg;

	unsigned int flags;
	unsigned int flags2;
	struct work_struct downshift_task;
	struct work_struct update_phy_task;
	struct work_struct print_hang_task;

	bool idle_check;
	int phy_hang_count;

	u16 tx_ring_count;
	u16 rx_ring_count;

	struct hwtstamp_config hwtstamp_config;
	struct delayed_work systim_overflow_work;
	struct sk_buff *tx_hwtstamp_skb;
	struct work_struct tx_hwtstamp_work;
	spinlock_t systim_lock;	/* protects SYSTIML/H regsters */
	struct cyclecounter cc;
	struct timecounter tc;
	struct ptp_clock *ptp_clock;
	struct ptp_clock_info ptp_clock_info;
};

struct e1000_info {
	enum e1000_mac_type	mac;
	unsigned int		flags;
	unsigned int		flags2;
	u32			pba;
	u32			max_hw_frame_size;
	s32			(*get_variants)(struct e1000_adapter *);
	const struct e1000_mac_operations *mac_ops;
	const struct e1000_phy_operations *phy_ops;
	const struct e1000_nvm_operations *nvm_ops;
};

s32 e1000e_get_base_timinca(struct e1000_adapter *adapter, u32 *timinca);

/* The system time is maintained by a 64-bit counter comprised of the 32-bit
 * SYSTIMH and SYSTIML registers.  How the counter increments (and therefore
 * its resolution) is based on the contents of the TIMINCA register - it
 * increments every incperiod (bits 31:24) clock ticks by incvalue (bits 23:0).
 * For the best accuracy, the incperiod should be as small as possible.  The
 * incvalue is scaled by a factor as large as possible (while still fitting
 * in bits 23:0) so that relatively small clock corrections can be made.
 *
 * As a result, a shift of INCVALUE_SHIFT_n is used to fit a value of
 * INCVALUE_n into the TIMINCA register allowing 32+8+(24-INCVALUE_SHIFT_n)
 * bits to count nanoseconds leaving the rest for fractional nonseconds.
 */
#define INCVALUE_96MHz		125
#define INCVALUE_SHIFT_96MHz	17
#define INCPERIOD_SHIFT_96MHz	2
#define INCPERIOD_96MHz		(12 >> INCPERIOD_SHIFT_96MHz)

#define INCVALUE_25MHz		40
#define INCVALUE_SHIFT_25MHz	18
#define INCPERIOD_25MHz		1

/* Another drawback of scaling the incvalue by a large factor is the
 * 64-bit SYSTIM register overflows more quickly.  This is dealt with
 * by simply reading the clock before it overflows.
 *
 * Clock	ns bits	Overflows after
 * ~~~~~~	~~~~~~~	~~~~~~~~~~~~~~~
 * 96MHz	47-bit	2^(47-INCPERIOD_SHIFT_96MHz) / 10^9 / 3600 = 9.77 hrs
 * 25MHz	46-bit	2^46 / 10^9 / 3600 = 19.55 hours
 */
#define E1000_SYSTIM_OVERFLOW_PERIOD	(HZ * 60 * 60 * 4)

/* hardware capability, feature, and workaround flags */
#define FLAG_HAS_AMT                      (1 << 0)
#define FLAG_HAS_FLASH                    (1 << 1)
#define FLAG_HAS_HW_VLAN_FILTER           (1 << 2)
#define FLAG_HAS_WOL                      (1 << 3)
/* reserved bit4 */
#define FLAG_HAS_CTRLEXT_ON_LOAD          (1 << 5)
#define FLAG_HAS_SWSM_ON_LOAD             (1 << 6)
#define FLAG_HAS_JUMBO_FRAMES             (1 << 7)
#define FLAG_READ_ONLY_NVM                (1 << 8)
#define FLAG_IS_ICH                       (1 << 9)
#define FLAG_HAS_MSIX                     (1 << 10)
#define FLAG_HAS_SMART_POWER_DOWN         (1 << 11)
#define FLAG_IS_QUAD_PORT_A               (1 << 12)
#define FLAG_IS_QUAD_PORT                 (1 << 13)
#define FLAG_HAS_HW_TIMESTAMP             (1 << 14)
#define FLAG_APME_IN_WUC                  (1 << 15)
#define FLAG_APME_IN_CTRL3                (1 << 16)
#define FLAG_APME_CHECK_PORT_B            (1 << 17)
#define FLAG_DISABLE_FC_PAUSE_TIME        (1 << 18)
#define FLAG_NO_WAKE_UCAST                (1 << 19)
#define FLAG_MNG_PT_ENABLED               (1 << 20)
#define FLAG_RESET_OVERWRITES_LAA         (1 << 21)
#define FLAG_TARC_SPEED_MODE_BIT          (1 << 22)
#define FLAG_TARC_SET_BIT_ZERO            (1 << 23)
#define FLAG_RX_NEEDS_RESTART             (1 << 24)
#define FLAG_LSC_GIG_SPEED_DROP           (1 << 25)
#define FLAG_SMART_POWER_DOWN             (1 << 26)
#define FLAG_MSI_ENABLED                  (1 << 27)
/* reserved (1 << 28) */
#define FLAG_TSO_FORCE                    (1 << 29)
#define FLAG_RESTART_NOW                  (1 << 30)
#define FLAG_MSI_TEST_FAILED              (1 << 31)

#define FLAG2_CRC_STRIPPING               (1 << 0)
#define FLAG2_HAS_PHY_WAKEUP              (1 << 1)
#define FLAG2_IS_DISCARDING               (1 << 2)
#define FLAG2_DISABLE_ASPM_L1             (1 << 3)
#define FLAG2_HAS_PHY_STATS               (1 << 4)
#define FLAG2_HAS_EEE                     (1 << 5)
#define FLAG2_DMA_BURST                   (1 << 6)
#define FLAG2_DISABLE_ASPM_L0S            (1 << 7)
#define FLAG2_DISABLE_AIM                 (1 << 8)
#define FLAG2_CHECK_PHY_HANG              (1 << 9)
#define FLAG2_NO_DISABLE_RX               (1 << 10)
#define FLAG2_PCIM2PCI_ARBITER_WA         (1 << 11)
#define FLAG2_DFLT_CRC_STRIPPING          (1 << 12)
#define FLAG2_CHECK_RX_HWTSTAMP           (1 << 13)

#define E1000_RX_DESC_PS(R, i)	    \
	(&(((union e1000_rx_desc_packet_split *)((R).desc))[i]))
#define E1000_RX_DESC_EXT(R, i)	    \
	(&(((union e1000_rx_desc_extended *)((R).desc))[i]))
#define E1000_GET_DESC(R, i, type)	(&(((struct type *)((R).desc))[i]))
#define E1000_TX_DESC(R, i)		E1000_GET_DESC(R, i, e1000_tx_desc)
#define E1000_CONTEXT_DESC(R, i)	E1000_GET_DESC(R, i, e1000_context_desc)

enum e1000_state_t {
	__E1000_TESTING,
	__E1000_RESETTING,
	__E1000_ACCESS_SHARED_RESOURCE,
	__E1000_DOWN
};

enum latency_range {
	lowest_latency = 0,
	low_latency = 1,
	bulk_latency = 2,
	latency_invalid = 255
};

extern char e1000e_driver_name[];
extern const char e1000e_driver_version[];

extern void e1000e_check_options(struct e1000_adapter *adapter);
extern void e1000e_set_ethtool_ops(struct net_device *netdev);

extern int e1000e_up(struct e1000_adapter *adapter);
extern void e1000e_down(struct e1000_adapter *adapter);
extern void e1000e_reinit_locked(struct e1000_adapter *adapter);
extern void e1000e_reset(struct e1000_adapter *adapter);
extern void e1000e_power_up_phy(struct e1000_adapter *adapter);
extern int e1000e_setup_rx_resources(struct e1000_ring *ring);
extern int e1000e_setup_tx_resources(struct e1000_ring *ring);
extern void e1000e_free_rx_resources(struct e1000_ring *ring);
extern void e1000e_free_tx_resources(struct e1000_ring *ring);
extern struct rtnl_link_stats64 *e1000e_get_stats64(struct net_device *netdev,
                                                    struct rtnl_link_stats64
                                                    *stats);
extern void e1000e_set_interrupt_capability(struct e1000_adapter *adapter);
extern void e1000e_reset_interrupt_capability(struct e1000_adapter *adapter);
extern void e1000e_get_hw_control(struct e1000_adapter *adapter);
extern void e1000e_release_hw_control(struct e1000_adapter *adapter);
extern void e1000e_write_itr(struct e1000_adapter *adapter, u32 itr);

extern unsigned int copybreak;

extern const struct e1000_info e1000_82571_info;
extern const struct e1000_info e1000_82572_info;
extern const struct e1000_info e1000_82573_info;
extern const struct e1000_info e1000_82574_info;
extern const struct e1000_info e1000_82583_info;
extern const struct e1000_info e1000_ich8_info;
extern const struct e1000_info e1000_ich9_info;
extern const struct e1000_info e1000_ich10_info;
extern const struct e1000_info e1000_pch_info;
extern const struct e1000_info e1000_pch2_info;
extern const struct e1000_info e1000_pch_lpt_info;
extern const struct e1000_info e1000_es2_info;

extern void e1000e_ptp_init(struct e1000_adapter *adapter);
extern void e1000e_ptp_remove(struct e1000_adapter *adapter);

static inline s32 e1000_phy_hw_reset(struct e1000_hw *hw)
{
	return hw->phy.ops.reset(hw);
}

static inline s32 e1e_rphy(struct e1000_hw *hw, u32 offset, u16 *data)
{
	return hw->phy.ops.read_reg(hw, offset, data);
}

static inline s32 e1e_rphy_locked(struct e1000_hw *hw, u32 offset, u16 *data)
{
	return hw->phy.ops.read_reg_locked(hw, offset, data);
}

static inline s32 e1e_wphy(struct e1000_hw *hw, u32 offset, u16 data)
{
	return hw->phy.ops.write_reg(hw, offset, data);
}

static inline s32 e1e_wphy_locked(struct e1000_hw *hw, u32 offset, u16 data)
{
	return hw->phy.ops.write_reg_locked(hw, offset, data);
}

extern void e1000e_reload_nvm_generic(struct e1000_hw *hw);

static inline s32 e1000e_read_mac_addr(struct e1000_hw *hw)
{
	if (hw->mac.ops.read_mac_addr)
		return hw->mac.ops.read_mac_addr(hw);

	return e1000_read_mac_addr_generic(hw);
}

static inline s32 e1000_validate_nvm_checksum(struct e1000_hw *hw)
{
	return hw->nvm.ops.validate(hw);
}

static inline s32 e1000e_update_nvm_checksum(struct e1000_hw *hw)
{
	return hw->nvm.ops.update(hw);
}

static inline s32 e1000_read_nvm(struct e1000_hw *hw, u16 offset, u16 words, u16 *data)
{
	return hw->nvm.ops.read(hw, offset, words, data);
}

static inline s32 e1000_write_nvm(struct e1000_hw *hw, u16 offset, u16 words, u16 *data)
{
	return hw->nvm.ops.write(hw, offset, words, data);
}

static inline s32 e1000_get_phy_info(struct e1000_hw *hw)
{
	return hw->phy.ops.get_info(hw);
}

static inline u32 __er32(struct e1000_hw *hw, unsigned long reg)
{
	return readl(hw->hw_addr + reg);
}

#define er32(reg)	__er32(hw, E1000_##reg)

/**
 * __ew32_prepare - prepare to write to MAC CSR register on certain parts
 * @hw: pointer to the HW structure
 *
 * When updating the MAC CSR registers, the Manageability Engine (ME) could
 * be accessing the registers at the same time.  Normally, this is handled in
 * h/w by an arbiter but on some parts there is a bug that acknowledges Host
 * accesses later than it should which could result in the register to have
 * an incorrect value.  Workaround this by checking the FWSM register which
 * has bit 24 set while ME is accessing MAC CSR registers, wait if it is set
 * and try again a number of times.
 **/
static inline s32 __ew32_prepare(struct e1000_hw *hw)
{
	s32 i = E1000_ICH_FWSM_PCIM2PCI_COUNT;

	while ((er32(FWSM) & E1000_ICH_FWSM_PCIM2PCI) && --i)
		udelay(50);

	return i;
}

static inline void __ew32(struct e1000_hw *hw, unsigned long reg, u32 val)
{
	if (hw->adapter->flags2 & FLAG2_PCIM2PCI_ARBITER_WA)
		__ew32_prepare(hw);

	writel(val, hw->hw_addr + reg);
}

#define ew32(reg, val)	__ew32(hw, E1000_##reg, (val))

#define e1e_flush()	er32(STATUS)

#define E1000_WRITE_REG_ARRAY(a, reg, offset, value) \
	(__ew32((a), (reg + ((offset) << 2)), (value)))

#define E1000_READ_REG_ARRAY(a, reg, offset) \
	(readl((a)->hw_addr + reg + ((offset) << 2)))

#endif /* _E1000_H_ */