/*-
 * BSD LICENSE
 *
 * Copyright (c) 2015-2017 Amazon.com, Inc. or its affiliates.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * * Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in
 * the documentation and/or other materials provided with the
 * distribution.
 * * Neither the name of copyright holder nor the names of its
 * contributors may be used to endorse or promote products derived
 * from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef ENA_PLAT_H_
#define ENA_PLAT_H_

#include <sys/cdefs.h>
#if 0
__FBSDID("$FreeBSD: head/sys/contrib/ena-com/ena_plat.h 333453 2018-05-10 09:25:51Z mw $");
#endif
__KERNEL_RCSID(0, "$NetBSD: ena_plat.h,v 1.4 2018/11/28 19:15:32 jmcneill Exp $");

#include <sys/param.h>
#include <sys/systm.h>

#include <sys/bus.h>
#include <sys/condvar.h>
#include <sys/endian.h>
#include <sys/kernel.h>
#include <sys/kthread.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/module.h>
#include <sys/proc.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/sysctl.h>
#include <sys/types.h>
#include <sys/bus.h>
#include <sys/atomic.h>

#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_media.h>
#include <net/if_ether.h>

#include <net/bpf.h>

#include <net/rss_config.h>

#include <netinet/in.h>			/* XXX for struct ip */
#include <netinet/in_systm.h>		/* XXX for struct ip */
#include <netinet/ip.h>			/* XXX for struct ip */
#include <netinet/ip6.h>		/* XXX for struct ip6_hdr */
#include <netinet/tcp.h>		/* XXX for struct tcphdr */

#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>

extern struct ena_bus_space ebs;

/* Levels */
#define ENA_ALERT 	(1 << 0) /* Alerts are providing more error info.     */
#define ENA_WARNING 	(1 << 1) /* Driver output is more error sensitive.    */
#define ENA_INFO 	(1 << 2) /* Provides additional driver info. 	      */
#define ENA_DBG 	(1 << 3) /* Driver output for debugging.	      */
/* Detailed info that will be printed with ENA_INFO or ENA_DEBUG flag. 	      */
#define ENA_TXPTH 	(1 << 4) /* Allows TX path tracing. 		      */
#define ENA_RXPTH 	(1 << 5) /* Allows RX path tracing.		      */
#define ENA_RSC 	(1 << 6) /* Goes with TXPTH or RXPTH, free/alloc res. */
#define ENA_IOQ 	(1 << 7) /* Detailed info about IO queues. 	      */
#define ENA_ADMQ	(1 << 8) /* Detailed info about admin queue. 	      */

extern int ena_log_level;

#define ena_trace_raw(level, fmt, args...)			\
	do {							\
		if (((level) & ena_log_level) != (level))	\
			break;					\
		printf(fmt, ##args);				\
	} while (0)

#define ena_trace(level, fmt, args...)				\
	ena_trace_raw(level, "%s() [LID:%d]: "			\
	    fmt " \n", __func__, curlwp->l_lid, ##args)


#define ena_trc_dbg(format, arg...) 	ena_trace(ENA_DBG, format, ##arg)
#define ena_trc_info(format, arg...) 	ena_trace(ENA_INFO, format, ##arg)
#define ena_trc_warn(format, arg...) 	ena_trace(ENA_WARNING, format, ##arg)
#define ena_trc_err(format, arg...) 	ena_trace(ENA_ALERT, format, ##arg)

#define unlikely(x)	__predict_false(x)
#define likely(x)  	__predict_true(x)

#define __iomem
#define ____cacheline_aligned __aligned(CACHE_LINE_SIZE)

#define MAX_ERRNO 4095
#define IS_ERR_VALUE(x) unlikely((x) <= (unsigned long)MAX_ERRNO)

#define ENA_ASSERT(cond, format, arg...)				\
	do {								\
		if (unlikely(!(cond))) {				\
			ena_trc_err(					\
				"Assert failed on %s:%s:%d:" format,	\
				__FILE__, __func__, __LINE__, ##arg);	\
		}							\
	} while (0)

#define ENA_WARN(cond, format, arg...)					\
	do {								\
		if (unlikely((cond))) {					\
			ena_trc_warn(format, ##arg);			\
		}							\
	} while (0)

static inline long IS_ERR(const void *ptr)
{
	return IS_ERR_VALUE((unsigned long)ptr);
}

static inline void *ERR_PTR(long error)
{
	return (void *)error;
}

static inline long PTR_ERR(const void *ptr)
{
	return (long) ptr;
}

#define GENMASK(h, l)		(((1U << ((h) - (l) + 1)) - 1) << (l))
#define GENMASK_ULL(h, l)	(((~0ULL) << (l)) & (~0ULL >> (64 - 1 - (h))))
#define BIT(x)			(1UL << (x))

#define ENA_ABORT() 		BUG()
#define BUG() 			panic("ENA BUG")

#define SZ_256			(256)
#define SZ_4K			(4096)

#define	ENA_COM_OK		0
#define ENA_COM_FAULT		EFAULT
#define	ENA_COM_INVAL		EINVAL
#define ENA_COM_NO_MEM		ENOMEM
#define	ENA_COM_NO_SPACE	ENOSPC
#define ENA_COM_TRY_AGAIN	-1
#define	ENA_COM_UNSUPPORTED	EOPNOTSUPP
#define	ENA_COM_NO_DEVICE	ENODEV
#define	ENA_COM_PERMISSION	EPERM
#define ENA_COM_TIMER_EXPIRED	ETIMEDOUT

static inline int
ENA_MSLEEP(int x)
{
	if (cold) {
		while (x >= 1000000) {
			delay(1000000);
			x -= 1000000;
		}
		if (x > 0)
			delay(x);
		return EWOULDBLOCK;
	} else {
		return kpause("enaw", false, mstohz(x), NULL);
	}
}

#define ENA_UDELAY(x) 		DELAY(x)
#define ENA_GET_SYSTEM_TIMEOUT(timeout_us) \
	mstohz(timeout_us * (1000 / 100))	/* XXX assumes 100 ms sleep */
#define ENA_TIME_EXPIRE(timeout)  ((timeout)-- <= 0)
#define ENA_MIGHT_SLEEP()

#define min_t(type, _x, _y) ((type)(_x) < (type)(_y) ? (type)(_x) : (type)(_y))
#define max_t(type, _x, _y) ((type)(_x) > (type)(_y) ? (type)(_x) : (type)(_y))

#define ENA_MIN32(x,y) 	MIN(x, y)
#define ENA_MIN16(x,y)	MIN(x, y)
#define ENA_MIN8(x,y)	MIN(x, y)

#define ENA_MAX32(x,y) 	MAX(x, y)
#define ENA_MAX16(x,y) 	MAX(x, y)
#define ENA_MAX8(x,y) 	MAX(x, y)

/* Spinlock related methods */
#define ena_spinlock_t 	kmutex_t
#define ENA_SPINLOCK_INIT(spinlock)				\
	mutex_init(&(spinlock), MUTEX_DEFAULT, IPL_NET)
#define ENA_SPINLOCK_DESTROY(spinlock)				\
	do {							\
		mutex_destroy(&(spinlock));			\
	} while (0)
#define ENA_SPINLOCK_LOCK(spinlock, flags)			\
	do {							\
		(void)(flags);					\
		mutex_enter(&(spinlock));			\
	} while (0)
#define ENA_SPINLOCK_UNLOCK(spinlock, flags)			\
	do {							\
		(void)(flags);					\
		mutex_exit(&(spinlock));			\
	} while (0)


/* Wait queue related methods */
#define ena_wait_event_t struct { kcondvar_t wq; kmutex_t mtx; }
#define ENA_WAIT_EVENT_INIT(waitqueue)					\
	do {								\
		cv_init(&((waitqueue).wq), "enacv");			\
		mutex_init(&((waitqueue).mtx), MUTEX_DEFAULT, IPL_NET);	\
	} while (0)
#define ENA_WAIT_EVENT_DESTROY(waitqueue)				\
	do {								\
		cv_destroy(&((waitqueue).wq));				\
		mutex_destroy(&((waitqueue).mtx));			\
	} while (0)
#define ENA_WAIT_EVENT_CLEAR(waitqueue)					\
	cv_init(&((waitqueue).wq), "enacv")
#define ENA_WAIT_EVENT_WAIT(waitqueue, timeout_us)			\
	do {								\
		mutex_enter(&((waitqueue).mtx));			\
		cv_timedwait(&((waitqueue).wq), &((waitqueue).mtx),	\
		    timeout_us * hz / 1000 / 1000 );			\
		mutex_exit(&((waitqueue).mtx));				\
	} while (0)
#define ENA_WAIT_EVENT_SIGNAL(waitqueue)		\
	do {						\
		mutex_enter(&((waitqueue).mtx));	\
		cv_broadcast(&((waitqueue).wq));	\
		mutex_exit(&((waitqueue).mtx));		\
	} while (0)

#define dma_addr_t 	bus_addr_t
#define u8 		uint8_t
#define u16 		uint16_t
#define u32 		uint32_t
#define u64 		uint64_t

typedef struct {
	paddr_t                 paddr;
	void                    *vaddr;
        bus_dma_tag_t           tag;
	bus_dmamap_t            map;
        bus_dma_segment_t       seg;
	int                     nseg;
} ena_mem_handle_t;

struct ena_bus {
	bus_space_handle_t 	reg_bar_h;
	bus_space_tag_t 	reg_bar_t;
	bus_space_handle_t	mem_bar_h;
	bus_space_tag_t 	mem_bar_t;
};

typedef uint32_t ena_atomic32_t;

void	ena_dmamap_callback(void *arg, bus_dma_segment_t *segs, int nseg,
    int error);
int	ena_dma_alloc(device_t dmadev, bus_size_t size, ena_mem_handle_t *dma,
    int mapflags);

#define ENA_MEMCPY_TO_DEVICE_64(dst, src, size)				\
	do {								\
		int count, i;						\
		volatile uint64_t *to = (volatile uint64_t *)(dst);	\
		const uint64_t *from = (const uint64_t *)(src);		\
		count = (size) / 8;					\
									\
		for (i = 0; i < count; i++, from++, to++)		\
			*to = *from;					\
	} while (0)

#define ENA_MEM_ALLOC(dmadev, size) malloc(size, M_DEVBUF, M_NOWAIT | M_ZERO)
#define ENA_MEM_ALLOC_NODE(dmadev, size, virt, node, dev_node) (virt = NULL)
#define ENA_MEM_FREE(dmadev, ptr) free(ptr, M_DEVBUF)
#define ENA_MEM_ALLOC_COHERENT_NODE(dmadev, size, virt, phys, handle, node, \
    dev_node)								\
	do {								\
		((virt) = NULL);					\
		(void)(dev_node);					\
	} while (0)

#define ENA_MEM_ALLOC_COHERENT(dmadev, size, virt, phys, dma)		\
	do {								\
		ena_dma_alloc((dmadev), (size), &(dma), 0);		\
		(virt) = (void *)(dma).vaddr;				\
		(phys) = (dma).paddr;					\
	} while (0)

#define ENA_MEM_FREE_COHERENT(dmadev, size, virt, phys, dma)		\
	do {								\
		(void)size;						\
		bus_dmamap_unload((dma).tag, (dma).map);		\
		bus_dmamem_free((dma).tag, &(dma).seg, (dma).nseg);	\
		bus_dma_tag_destroy((dma).tag);	/* XXX remove */	\
		(dma).tag = NULL;					\
		(virt) = NULL;						\
	} while (0)

/* Register R/W methods */
#define ENA_REG_WRITE32(bus, value, offset)				\
	bus_space_write_4(						\
			  ((struct ena_bus*)bus)->reg_bar_t,		\
			  ((struct ena_bus*)bus)->reg_bar_h,		\
			  (bus_size_t)(offset), (value))

#define ENA_REG_READ32(bus, offset)					\
	bus_space_read_4(						\
			 ((struct ena_bus*)bus)->reg_bar_t,		\
			 ((struct ena_bus*)bus)->reg_bar_h,		\
			 (bus_size_t)(offset))

#define ENA_DB_SYNC(mem_handle)	bus_dmamap_sync((mem_handle)->tag,	\
	(mem_handle)->map, 0, (mem_handle)->map->dm_mapsize,		\
	BUS_DMASYNC_PREREAD)

#define time_after(a,b)	((long)((unsigned long)(b) - (unsigned long)(a)) < 0)

#define VLAN_HLEN 	sizeof(struct ether_vlan_header)
#define CSUM_OFFLOAD 	(M_CSUM_IPv4|M_CSUM_TCPv4|M_CSUM_UDPv4)

#if defined(__i386__) || defined(__amd64__)
static __inline
void prefetch(void *x)
{
	__asm volatile("prefetcht0 %0" :: "m" (*(unsigned long *)x));
}
#else
#define prefetch(x)
#endif

/* DMA buffers access */
#define	dma_unmap_addr(p, name)			((p)->dma->name)
#define	dma_unmap_addr_set(p, name, v)		(((p)->dma->name) = (v))
#define	dma_unmap_len(p, name)			((p)->name)
#define	dma_unmap_len_set(p, name, v)		(((p)->name) = (v))

#define memcpy_toio memcpy

#define ATOMIC32_INC(I32_PTR)		atomic_inc_32(I32_PTR)
#define ATOMIC32_DEC(I32_PTR) 		atomic_dec_32(I32_PTR)
#define ATOMIC32_READ(I32_PTR) 		atomic_cas_32(I32_PTR, 0, 0)
#define ATOMIC32_SET(I32_PTR, VAL) 	atomic_swap_32(I32_PTR, VAL)

#define	barrier() __asm__ __volatile__("": : :"memory")
#define	ACCESS_ONCE(x) (*(volatile __typeof(x) *)&(x))
#define READ_ONCE(x)  ({			\
			__typeof(x) __var;	\
			barrier();		\
			__var = ACCESS_ONCE(x);	\
			barrier();		\
			__var;			\
		})

#include "ena_defs/ena_includes.h"

#define	rmb()		membar_enter()
#define	wmb()		membar_exit()
#define	mb()		membar_sync()

#endif /* ENA_PLAT_H_ */