/*
 * Linux OS Independent Layer
 *
 * Copyright 2007, Broadcom Corporation
 * All Rights Reserved.
 * 
 * THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
 * KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
 * SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
 *
 * $Id: linux_osl.c,v 1.1.1.1 2008/07/21 09:20:53 james26_jang Exp $
 */

#define LINUX_OSL

#include <typedefs.h>
#include <bcmendian.h>
#include <linuxver.h>
#include <bcmdefs.h>
#include <osl.h>
#include <bcmutils.h>
#include <linux/delay.h>
#ifdef mips
#include <asm/paccess.h>
#endif /* mips */
#include <pcicfg.h>

#define PCI_CFG_RETRY 		10	

#define OS_HANDLE_MAGIC		0x1234abcd	/* Magic # to recognise osh */
#define BCM_MEM_FILENAME_LEN 	24		/* Mem. filename length */

typedef struct bcm_mem_link {
	struct bcm_mem_link *prev;
	struct bcm_mem_link *next;
	uint	size;
	int	line;
	char	file[BCM_MEM_FILENAME_LEN];
} bcm_mem_link_t;

struct osl_info {
	osl_pubinfo_t pub;
	uint magic;
	void *pdev;
	uint malloced;
	uint failed;
	uint bustype;
	bcm_mem_link_t *dbgmem_list;
#if defined(DSLCPE_DELAY)
	shared_osl_t *oshsh; /* osh shared */
#endif
#ifdef BCMDBG_PKT      /* pkt logging for debugging */
	pktlist_info_t pktlist;
#endif  /* BCMDBG_PKT */
};

static int16 linuxbcmerrormap[] =  \
{	0, 			/* 0 */
	-EINVAL,		/* BCME_ERROR */
	-EINVAL,		/* BCME_BADARG */
	-EINVAL,		/* BCME_BADOPTION */
	-EINVAL,		/* BCME_NOTUP */
	-EINVAL,		/* BCME_NOTDOWN */
	-EINVAL,		/* BCME_NOTAP */
	-EINVAL,		/* BCME_NOTSTA */
	-EINVAL,		/* BCME_BADKEYIDX */
	-EINVAL,		/* BCME_RADIOOFF */
	-EINVAL,		/* BCME_NOTBANDLOCKED */
	-EINVAL, 		/* BCME_NOCLK */
	-EINVAL, 		/* BCME_BADRATESET */
	-EINVAL, 		/* BCME_BADBAND */
	-E2BIG,			/* BCME_BUFTOOSHORT */
	-E2BIG,			/* BCME_BUFTOOLONG */
	-EBUSY, 		/* BCME_BUSY */
	-EINVAL, 		/* BCME_NOTASSOCIATED */
	-EINVAL, 		/* BCME_BADSSIDLEN */
	-EINVAL, 		/* BCME_OUTOFRANGECHAN */
	-EINVAL, 		/* BCME_BADCHAN */
	-EFAULT, 		/* BCME_BADADDR */
	-ENOMEM, 		/* BCME_NORESOURCE */
	-EOPNOTSUPP,		/* BCME_UNSUPPORTED */
	-EMSGSIZE,		/* BCME_BADLENGTH */
	-EINVAL,		/* BCME_NOTREADY */
	-EPERM,			/* BCME_NOTPERMITTED */
	-ENOMEM, 		/* BCME_NOMEM */
	-EINVAL, 		/* BCME_ASSOCIATED */
	-ERANGE, 		/* BCME_RANGE */
	-EINVAL, 		/* BCME_NOTFOUND */
	-EINVAL, 		/* BCME_WME_NOT_ENABLED */
	-EINVAL, 		/* BCME_TSPEC_NOTFOUND */
	-EINVAL, 		/* BCME_ACM_NOTSUPPORTED */
	-EINVAL,		/* BCME_NOT_WME_ASSOCIATION */
	-EIO,			/* BCME_SDIO_ERROR */
	-ENODEV,		/* BCME_DONGLE_DOWN */
	-EINVAL			/* BCME_VERSION */

/* When an new error code is added to bcmutils.h, add os 
 * spcecific error translation here as well
 */
/* check if BCME_LAST changed since the last time this function was updated */
#if BCME_LAST != -37
#error "You need to add a OS error translation in the linuxbcmerrormap \
	for new error code defined in bcmuitls.h"
#endif /* BCME_LAST != -37 */
};

/* translate bcmerrors into linux errors */
int
osl_error(int bcmerror)
{
	if (bcmerror > 0)
		bcmerror = 0;
	else if (bcmerror < BCME_LAST)
		bcmerror = BCME_ERROR;

	/* Array bounds covered by ASSERT in osl_attach */
	return linuxbcmerrormap[-bcmerror];
}

osl_t *
osl_attach(void *pdev, uint bustype, bool pkttag)
{
	osl_t *osh;

	osh = kmalloc(sizeof(osl_t), GFP_ATOMIC);
	ASSERT(osh);

	bzero(osh, sizeof(osl_t));

	/* Check that error map has the right number of entries in it */
	ASSERT(ABS(BCME_LAST) == (ARRAYSIZE(linuxbcmerrormap) - 1));

	osh->magic = OS_HANDLE_MAGIC;
	osh->malloced = 0;
	osh->failed = 0;
	osh->dbgmem_list = NULL;
	osh->pdev = pdev;
	osh->pub.pkttag = pkttag;
	osh->bustype = bustype;

	switch (bustype) {
		case PCI_BUS:
		case SB_BUS:
		case PCMCIA_BUS:
			osh->pub.mmbus = TRUE;
			break;
		case JTAG_BUS:
		case SDIO_BUS:
		case USB_BUS:
			osh->pub.mmbus = FALSE;
			break;
		default:
			ASSERT(FALSE);
			break;
	}

	return osh;
}

void
osl_detach(osl_t *osh)
{
	if (osh == NULL)
		return;

	ASSERT(osh->magic == OS_HANDLE_MAGIC);
	kfree(osh);
}

/* Return a new packet. zero out pkttag */
void*
osl_pktget(osl_t *osh, uint len)
{
	struct sk_buff *skb;

	if ((skb = dev_alloc_skb(len))) {
		skb_put(skb, len);
		skb->priority = 0;

#ifdef BCMDBG_PKT
	pktlist_add(&(osh->pktlist), (void *) skb);
#endif  /* BCMDBG_PKT */

		osh->pub.pktalloced++;
	}

	return ((void*) skb);
}

/* Free the driver packet. Free the tag if present */
void
osl_pktfree(osl_t *osh, void *p, bool send)
{
	struct sk_buff *skb, *nskb;

	skb = (struct sk_buff*) p;

	if (send && osh->pub.tx_fn)
		osh->pub.tx_fn(osh->pub.tx_ctx, p, 0);

	/* perversion: we use skb->next to chain multi-skb packets */
	while (skb) {
		nskb = skb->next;
		skb->next = NULL;

#ifdef BCMDBG_PKT
		pktlist_remove(&(osh->pktlist), (void *) skb);
#endif  /* BCMDBG_PKT */

		if (skb->destructor) {
			/* cannot kfree_skb() on hard IRQ (net/core/skbuff.c) if destructor exists
			 */
			dev_kfree_skb_any(skb);
		} else {
			/* can free immediately (even in_irq()) if destructor does not exist */
			dev_kfree_skb(skb);
		}

		osh->pub.pktalloced--;

		skb = nskb;
	}
}

uint32
osl_pci_read_config(osl_t *osh, uint offset, uint size)
{
	uint val;
	uint retry = PCI_CFG_RETRY;	 

	ASSERT((osh && (osh->magic == OS_HANDLE_MAGIC)));

	/* only 4byte access supported */
	ASSERT(size == 4);

	do {
		pci_read_config_dword(osh->pdev, offset, &val);
		if (val != 0xffffffff)
			break;
	} while (retry--);


	return (val);
}

void
osl_pci_write_config(osl_t *osh, uint offset, uint size, uint val)
{
	uint retry = PCI_CFG_RETRY;	 

	ASSERT((osh && (osh->magic == OS_HANDLE_MAGIC)));

	/* only 4byte access supported */
	ASSERT(size == 4);

	do {
		pci_write_config_dword(osh->pdev, offset, val);
		if (offset != PCI_BAR0_WIN)
			break;
		if (osl_pci_read_config(osh, offset, size) == val)
			break;
	} while (retry--);

}

/* return bus # for the pci device pointed by osh->pdev */
uint
osl_pci_bus(osl_t *osh)
{
	ASSERT(osh && (osh->magic == OS_HANDLE_MAGIC) && osh->pdev);

	return ((struct pci_dev *)osh->pdev)->bus->number;
}

/* return slot # for the pci device pointed by osh->pdev */
uint
osl_pci_slot(osl_t *osh)
{
	ASSERT(osh && (osh->magic == OS_HANDLE_MAGIC) && osh->pdev);

	return PCI_SLOT(((struct pci_dev *)osh->pdev)->devfn);
}

static void
osl_pcmcia_attr(osl_t *osh, uint offset, char *buf, int size, bool write)
{
}

void
osl_pcmcia_read_attr(osl_t *osh, uint offset, void *buf, int size)
{
	osl_pcmcia_attr(osh, offset, (char *) buf, size, FALSE);
}

void
osl_pcmcia_write_attr(osl_t *osh, uint offset, void *buf, int size)
{
	osl_pcmcia_attr(osh, offset, (char *) buf, size, TRUE);
}


#ifdef BCMDBG_MEM

void*
osl_debug_malloc(osl_t *osh, uint size, int line, char* file)
{
	bcm_mem_link_t *p;
	char* basename;

	ASSERT(size);

	if ((p = (bcm_mem_link_t*)osl_malloc(osh, sizeof(bcm_mem_link_t) + size)) == NULL)
		return (NULL);

	p->size = size;
	p->line = line;

	basename = strrchr(file, '/');
	/* skip the '/' */
	if (basename)
		basename++;

	if (!basename)
		basename = file;

	strncpy(p->file, basename, BCM_MEM_FILENAME_LEN);
	p->file[BCM_MEM_FILENAME_LEN - 1] = '\0';

	/* link this block */
	p->prev = NULL;
	p->next = osh->dbgmem_list;
	if (p->next)
		p->next->prev = p;
	osh->dbgmem_list = p;

	return p + 1;
}

void
osl_debug_mfree(osl_t *osh, void *addr, uint size, int line, char* file)
{
	bcm_mem_link_t *p = (bcm_mem_link_t *)((int8*)addr - sizeof(bcm_mem_link_t));

	ASSERT((osh && (osh->magic == OS_HANDLE_MAGIC)));

	if (p->size == 0) {
		printk("osl_debug_mfree: double free on addr %p size %d at line %d file %s\n",
			addr, size, line, file);
		ASSERT(p->size);
		return;
	}

	if (p->size != size) {
		printk("osl_debug_mfree: dealloc size %d does not match alloc size %d on addr %p"
		       " at line %d file %s\n",
		       size, p->size, addr, line, file);
		ASSERT(p->size == size);
		return;
	}

	/* unlink this block */
	if (p->prev)
		p->prev->next = p->next;
	if (p->next)
		p->next->prev = p->prev;
	if (osh->dbgmem_list == p)
		osh->dbgmem_list = p->next;
	p->next = p->prev = NULL;

	osl_mfree(osh, p, size + sizeof(bcm_mem_link_t));
}

int
osl_debug_memdump(osl_t *osh, struct bcmstrbuf *b)
{
	bcm_mem_link_t *p;

	ASSERT((osh && (osh->magic == OS_HANDLE_MAGIC)));

	bcm_bprintf(b, "   Address\tSize\tFile:line\n");
	for (p = osh->dbgmem_list; p; p = p->next)
		bcm_bprintf(b, "0x%08x\t%5d\t%s:%d\n",
			(uintptr)p + sizeof(bcm_mem_link_t), p->size, p->file, p->line);

	return 0;
}

#endif	/* BCMDBG_MEM */

void*
osl_malloc(osl_t *osh, uint size)
{
	void *addr;

	/* only ASSERT if osh is defined */
	if (osh)
		ASSERT(osh->magic == OS_HANDLE_MAGIC);

	if ((addr = kmalloc(size, GFP_ATOMIC)) == NULL) {
		if (osh)
			osh->failed++;
		return (NULL);
	}
	if (osh)
		osh->malloced += size;

	return (addr);
}

void
osl_mfree(osl_t *osh, void *addr, uint size)
{
	if (osh) {
		ASSERT(osh->magic == OS_HANDLE_MAGIC);
		osh->malloced -= size;
	}
	kfree(addr);
}

uint
osl_malloced(osl_t *osh)
{
	ASSERT((osh && (osh->magic == OS_HANDLE_MAGIC)));
	return (osh->malloced);
}

uint
osl_malloc_failed(osl_t *osh)
{
	ASSERT((osh && (osh->magic == OS_HANDLE_MAGIC)));
	return (osh->failed);
}

void*
osl_dma_alloc_consistent(osl_t *osh, uint size, ulong *pap)
{
	ASSERT((osh && (osh->magic == OS_HANDLE_MAGIC)));

	return (pci_alloc_consistent(osh->pdev, size, (dma_addr_t*)pap));
}

void
osl_dma_free_consistent(osl_t *osh, void *va, uint size, ulong pa)
{
	ASSERT((osh && (osh->magic == OS_HANDLE_MAGIC)));

	pci_free_consistent(osh->pdev, size, va, (dma_addr_t)pa);
}

uint
osl_dma_map(osl_t *osh, void *va, uint size, int direction)
{
	int dir;

	ASSERT((osh && (osh->magic == OS_HANDLE_MAGIC)));
	dir = (direction == DMA_TX)? PCI_DMA_TODEVICE: PCI_DMA_FROMDEVICE;
	return (pci_map_single(osh->pdev, va, size, dir));
}

void
osl_dma_unmap(osl_t *osh, uint pa, uint size, int direction)
{
	int dir;

	ASSERT((osh && (osh->magic == OS_HANDLE_MAGIC)));
	dir = (direction == DMA_TX)? PCI_DMA_TODEVICE: PCI_DMA_FROMDEVICE;
	pci_unmap_single(osh->pdev, (uint32)pa, size, dir);
}

#if defined(BINOSL) || defined(BCMDBG_ASSERT)
void
osl_assert(char *exp, char *file, int line)
{
	char tempbuf[255];

	sprintf(tempbuf, "assertion \"%s\" failed: file \"%s\", line %d\n", exp, file, line);
	panic(tempbuf);
}
#endif	/* BCMDBG_ASSERT || BINOSL */

void
osl_delay(uint usec)
{
	uint d;

	while (usec > 0) {
		d = MIN(usec, 1000);
		udelay(d);
		usec -= d;
	}
}

#if defined(DSLCPE_DELAY)

void
osl_oshsh_init(osl_t *osh, shared_osl_t* oshsh)
{
	extern unsigned long loops_per_jiffy;
	osh->oshsh = oshsh;
	osh->oshsh->MIPS = loops_per_jiffy / (500000/HZ);
}

int
in_long_delay(osl_t *osh)
{
	return osh->oshsh->long_delay;
}

void
osl_long_delay(osl_t *osh, uint usec, bool yield)
{
	uint d;
	bool yielded = TRUE;
	int usec_to_delay = usec;
	unsigned long tick1, tick2, tick_diff = 0;

	/* delay at least requested usec */
	while (usec_to_delay > 0) {
		if (!yield || !yielded) {
			d = MIN(usec_to_delay, 10);
			udelay(d);
			usec_to_delay -= d;
		}
		if (usec_to_delay > 0) {
			osh->oshsh->long_delay++;
			OSL_GETCYCLES(tick1);
			spin_unlock_bh(osh->oshsh->lock);
			if (usec_to_delay > 0 && !in_irq() && !in_softirq() && !in_interrupt()) {
				schedule();
				yielded = TRUE;
			} else {
				yielded = FALSE;
			}
			spin_lock_bh(osh->oshsh->lock);
			OSL_GETCYCLES(tick2);

			if (yielded) {
				tick_diff = TICKDIFF(tick2, tick1);
				tick_diff = (tick_diff * 2)/(osh->oshsh->MIPS);
				if (tick_diff) {
					usec_to_delay -= tick_diff;
				} else
					yielded = 0;
			}
			osh->oshsh->long_delay--;
			ASSERT(osh->oshsh->long_delay >= 0);
		}
	}
}
#endif /* DSLCPE_DELAY */

/* Clone a packet.
 * The pkttag contents are NOT cloned.
 */
void *
osl_pktdup(osl_t *osh, void *skb)
{
	void * p;

	if ((p = skb_clone((struct sk_buff*)skb, GFP_ATOMIC)) == NULL)
		return NULL;

	/* skb_clone copies skb->cb.. we don't want that */
	if (osh->pub.pkttag)
		bzero((void*)((struct sk_buff *)p)->cb, OSL_PKTTAG_SZ);

	/* Increment the packet counter */
	osh->pub.pktalloced++;
#ifdef BCMDBG_PKT
	pktlist_add(&(osh->pktlist), (void *) p);
#endif  /* BCMDBG_PKT */
	return (p);
}

uint
osl_pktalloced(osl_t *osh)
{
	return (osh->pub.pktalloced);
}

#ifdef BCMDBG_PKT
char *
osl_pktlist_dump(osl_t *osh, char *buf)
{
	pktlist_dump(&(osh->pktlist), buf);
	return buf;
}

void
osl_pktlist_add(osl_t *osh, void *p)
{
	pktlist_add(&(osh->pktlist), p);
}

void
osl_pktlist_remove(osl_t *osh, void *p)
{
	pktlist_remove(&(osh->pktlist), p);
}
#endif /* BCMDBG_PKT */

/*
 * BINOSL selects the slightly slower function-call-based binary compatible osl.
 */
#ifdef BINOSL

int
osl_printf(const char *format, ...)
{
	va_list args;
	char buf[1024];
	int len;

	/* sprintf into a local buffer because there *is* no "vprintk()".. */
	va_start(args, format);
	len = vsnprintf(buf, 1024, format, args);
	va_end(args);

	if (len > sizeof(buf)) {
		printk("osl_printf: buffer overrun\n");
		return (0);
	}

	return (printk(buf));
}

int
osl_sprintf(char *buf, const char *format, ...)
{
	va_list args;
	int rc;

	va_start(args, format);
	rc = vsprintf(buf, format, args);
	va_end(args);
	return (rc);
}

int
osl_strcmp(const char *s1, const char *s2)
{
	return (strcmp(s1, s2));
}

int
osl_strncmp(const char *s1, const char *s2, uint n)
{
	return (strncmp(s1, s2, n));
}

int
osl_strlen(const char *s)
{
	return (strlen(s));
}

char*
osl_strcpy(char *d, const char *s)
{
	return (strcpy(d, s));
}

char*
osl_strncpy(char *d, const char *s, uint n)
{
	return (strncpy(d, s, n));
}

void
bcopy(const void *src, void *dst, int len)
{
	memcpy(dst, src, len);
}

int
bcmp(const void *b1, const void *b2, int len)
{
	return (memcmp(b1, b2, len));
}

void
bzero(void *b, int len)
{
	memset(b, '\0', len);
}

uint32
osl_readl(volatile uint32 *r)
{
	return (readl(r));
}

uint16
osl_readw(volatile uint16 *r)
{
	return (readw(r));
}

uint8
osl_readb(volatile uint8 *r)
{
	return (readb(r));
}

void
osl_writel(uint32 v, volatile uint32 *r)
{
	writel(v, r);
}

void
osl_writew(uint16 v, volatile uint16 *r)
{
	writew(v, r);
}

void
osl_writeb(uint8 v, volatile uint8 *r)
{
	writeb(v, r);
}

void *
osl_uncached(void *va)
{
#ifdef mips
	return ((void*)KSEG1ADDR(va));
#else
	return ((void*)va);
#endif /* mips */
}

uint
osl_getcycles(void)
{
	uint cycles;

#if defined(mips)
	cycles = read_c0_count() * 2;
#elif defined(__i386__)
	rdtscl(cycles);
#else
	cycles = 0;
#endif /* defined(mips) */
	return cycles;
}

void *
osl_reg_map(uint32 pa, uint size)
{
	return (ioremap_nocache((unsigned long)pa, (unsigned long)size));
}

void
osl_reg_unmap(void *va)
{
	iounmap(va);
}

int
osl_busprobe(uint32 *val, uint32 addr)
{
#ifdef mips
	return get_dbe(*val, (uint32 *)addr);
#else
	*val = readl((uint32 *)(uintptr)addr);
	return 0;
#endif /* mips */
}

bool
osl_pktshared(void *skb)
{
	return (((struct sk_buff*)skb)->cloned);
}

uchar*
osl_pktdata(osl_t *osh, void *skb)
{
	return (((struct sk_buff*)skb)->data);
}

uint
osl_pktlen(osl_t *osh, void *skb)
{
	return (((struct sk_buff*)skb)->len);
}

uint
osl_pktheadroom(osl_t *osh, void *skb)
{
	return (uint) skb_headroom((struct sk_buff *) skb);
}

uint
osl_pkttailroom(osl_t *osh, void *skb)
{
	return (uint) skb_tailroom((struct sk_buff *) skb);
}

void*
osl_pktnext(osl_t *osh, void *skb)
{
	return (((struct sk_buff*)skb)->next);
}

void
osl_pktsetnext(void *skb, void *x)
{
	((struct sk_buff*)skb)->next = (struct sk_buff*)x;
}

void
osl_pktsetlen(osl_t *osh, void *skb, uint len)
{
	__skb_trim((struct sk_buff*)skb, len);
}

uchar*
osl_pktpush(osl_t *osh, void *skb, int bytes)
{
	return (skb_push((struct sk_buff*)skb, bytes));
}

uchar*
osl_pktpull(osl_t *osh, void *skb, int bytes)
{
	return (skb_pull((struct sk_buff*)skb, bytes));
}

void*
osl_pkttag(void *skb)
{
	return ((void*)(((struct sk_buff*)skb)->cb));
}

void*
osl_pktlink(void *skb)
{
	return (((struct sk_buff*)skb)->prev);
}

void
osl_pktsetlink(void *skb, void *x)
{
	((struct sk_buff*)skb)->prev = (struct sk_buff*)x;
}

uint
osl_pktprio(void *skb)
{
	return (((struct sk_buff*)skb)->priority);
}

void
osl_pktsetprio(void *skb, uint x)
{
	((struct sk_buff*)skb)->priority = x;
}

/* Convert a driver packet to native(OS) packet
 * In the process, packettag is zeroed out before sending up
 * IP code depends on skb->cb to be setup correctly with various options
 * In our case, that means it should be 0
 */
struct sk_buff *
osl_pkt_tonative(osl_t *osh, void *pkt)
{
	struct sk_buff *nskb;

	if (osh->pub.pkttag)
		bzero((void*)((struct sk_buff *)pkt)->cb, OSL_PKTTAG_SZ);

	/* Decrement the packet counter */
	for (nskb = (struct sk_buff *)pkt; nskb; nskb = nskb->next) {
#ifdef BCMDBG_PKT
		pktlist_remove(&(osh->pktlist), (void *) nskb);
#endif  /* BCMDBG_PKT */
		osh->pub.pktalloced--;
	}

	return (struct sk_buff *)pkt;
}

/* Convert a native(OS) packet to driver packet.
 * In the process, native packet is destroyed, there is no copying
 * Also, a packettag is zeroed out
 */
void *
osl_pkt_frmnative(osl_t *osh, struct sk_buff *skb)
{
	struct sk_buff *nskb;

	if (osh->pub.pkttag)
		bzero((void*)skb->cb, OSL_PKTTAG_SZ);

	/* Increment the packet counter */
	for (nskb = skb; nskb; nskb = nskb->next) {
#ifdef BCMDBG_PKT
		pktlist_add(&(osh->pktlist), (void *) nskb);
#endif  /* BCMDBG_PKT */
		osh->pub.pktalloced++;
	}

	return (void *)skb;
}

#endif	/* BINOSL */