dhd_sdio.c 106 KB
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/*
 * Copyright (c) 2010 Broadcom Corporation
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/kthread.h>
#include <linux/printk.h>
#include <linux/pci_ids.h>
#include <linux/netdevice.h>
#include <linux/interrupt.h>
#include <linux/sched.h>
#include <linux/mmc/sdio.h>
#include <linux/mmc/sdio_func.h>
#include <linux/mmc/card.h>
#include <linux/semaphore.h>
#include <linux/firmware.h>
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#include <linux/module.h>
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#include <linux/bcma/bcma.h>
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#include <asm/unaligned.h>
#include <defs.h>
#include <brcmu_wifi.h>
#include <brcmu_utils.h>
#include <brcm_hw_ids.h>
#include <soc.h>
#include "sdio_host.h"
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#include "sdio_chip.h"
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#define DCMD_RESP_TIMEOUT  2000	/* In milli second */

#ifdef BCMDBG

#define BRCMF_TRAP_INFO_SIZE	80

#define CBUF_LEN	(128)

struct rte_log_le {
	__le32 buf;		/* Can't be pointer on (64-bit) hosts */
	__le32 buf_size;
	__le32 idx;
	char *_buf_compat;	/* Redundant pointer for backward compat. */
};

struct rte_console {
	/* Virtual UART
	 * When there is no UART (e.g. Quickturn),
	 * the host should write a complete
	 * input line directly into cbuf and then write
	 * the length into vcons_in.
	 * This may also be used when there is a real UART
	 * (at risk of conflicting with
	 * the real UART).  vcons_out is currently unused.
	 */
	uint vcons_in;
	uint vcons_out;

	/* Output (logging) buffer
	 * Console output is written to a ring buffer log_buf at index log_idx.
	 * The host may read the output when it sees log_idx advance.
	 * Output will be lost if the output wraps around faster than the host
	 * polls.
	 */
	struct rte_log_le log_le;

	/* Console input line buffer
	 * Characters are read one at a time into cbuf
	 * until <CR> is received, then
	 * the buffer is processed as a command line.
	 * Also used for virtual UART.
	 */
	uint cbuf_idx;
	char cbuf[CBUF_LEN];
};

#endif				/* BCMDBG */
#include <chipcommon.h>

#include "dhd.h"
#include "dhd_bus.h"
#include "dhd_proto.h"
#include "dhd_dbg.h"

#define TXQLEN		2048	/* bulk tx queue length */
#define TXHI		(TXQLEN - 256)	/* turn on flow control above TXHI */
#define TXLOW		(TXHI - 256)	/* turn off flow control below TXLOW */
#define PRIOMASK	7

#define TXRETRIES	2	/* # of retries for tx frames */

#define BRCMF_RXBOUND	50	/* Default for max rx frames in
				 one scheduling */

#define BRCMF_TXBOUND	20	/* Default for max tx frames in
				 one scheduling */

#define BRCMF_TXMINMAX	1	/* Max tx frames if rx still pending */

#define MEMBLOCK	2048	/* Block size used for downloading
				 of dongle image */
#define MAX_DATA_BUF	(32 * 1024)	/* Must be large enough to hold
				 biggest possible glom */

#define BRCMF_FIRSTREAD	(1 << 6)


/* SBSDIO_DEVICE_CTL */

/* 1: device will assert busy signal when receiving CMD53 */
#define SBSDIO_DEVCTL_SETBUSY		0x01
/* 1: assertion of sdio interrupt is synchronous to the sdio clock */
#define SBSDIO_DEVCTL_SPI_INTR_SYNC	0x02
/* 1: mask all interrupts to host except the chipActive (rev 8) */
#define SBSDIO_DEVCTL_CA_INT_ONLY	0x04
/* 1: isolate internal sdio signals, put external pads in tri-state; requires
 * sdio bus power cycle to clear (rev 9) */
#define SBSDIO_DEVCTL_PADS_ISO		0x08
/* Force SD->SB reset mapping (rev 11) */
#define SBSDIO_DEVCTL_SB_RST_CTL	0x30
/*   Determined by CoreControl bit */
#define SBSDIO_DEVCTL_RST_CORECTL	0x00
/*   Force backplane reset */
#define SBSDIO_DEVCTL_RST_BPRESET	0x10
/*   Force no backplane reset */
#define SBSDIO_DEVCTL_RST_NOBPRESET	0x20

/* direct(mapped) cis space */

/* MAPPED common CIS address */
#define SBSDIO_CIS_BASE_COMMON		0x1000
/* maximum bytes in one CIS */
#define SBSDIO_CIS_SIZE_LIMIT		0x200
/* cis offset addr is < 17 bits */
#define SBSDIO_CIS_OFT_ADDR_MASK	0x1FFFF

/* manfid tuple length, include tuple, link bytes */
#define SBSDIO_CIS_MANFID_TUPLE_LEN	6

/* intstatus */
#define I_SMB_SW0	(1 << 0)	/* To SB Mail S/W interrupt 0 */
#define I_SMB_SW1	(1 << 1)	/* To SB Mail S/W interrupt 1 */
#define I_SMB_SW2	(1 << 2)	/* To SB Mail S/W interrupt 2 */
#define I_SMB_SW3	(1 << 3)	/* To SB Mail S/W interrupt 3 */
#define I_SMB_SW_MASK	0x0000000f	/* To SB Mail S/W interrupts mask */
#define I_SMB_SW_SHIFT	0	/* To SB Mail S/W interrupts shift */
#define I_HMB_SW0	(1 << 4)	/* To Host Mail S/W interrupt 0 */
#define I_HMB_SW1	(1 << 5)	/* To Host Mail S/W interrupt 1 */
#define I_HMB_SW2	(1 << 6)	/* To Host Mail S/W interrupt 2 */
#define I_HMB_SW3	(1 << 7)	/* To Host Mail S/W interrupt 3 */
#define I_HMB_SW_MASK	0x000000f0	/* To Host Mail S/W interrupts mask */
#define I_HMB_SW_SHIFT	4	/* To Host Mail S/W interrupts shift */
#define I_WR_OOSYNC	(1 << 8)	/* Write Frame Out Of Sync */
#define I_RD_OOSYNC	(1 << 9)	/* Read Frame Out Of Sync */
#define	I_PC		(1 << 10)	/* descriptor error */
#define	I_PD		(1 << 11)	/* data error */
#define	I_DE		(1 << 12)	/* Descriptor protocol Error */
#define	I_RU		(1 << 13)	/* Receive descriptor Underflow */
#define	I_RO		(1 << 14)	/* Receive fifo Overflow */
#define	I_XU		(1 << 15)	/* Transmit fifo Underflow */
#define	I_RI		(1 << 16)	/* Receive Interrupt */
#define I_BUSPWR	(1 << 17)	/* SDIO Bus Power Change (rev 9) */
#define I_XMTDATA_AVAIL (1 << 23)	/* bits in fifo */
#define	I_XI		(1 << 24)	/* Transmit Interrupt */
#define I_RF_TERM	(1 << 25)	/* Read Frame Terminate */
#define I_WF_TERM	(1 << 26)	/* Write Frame Terminate */
#define I_PCMCIA_XU	(1 << 27)	/* PCMCIA Transmit FIFO Underflow */
#define I_SBINT		(1 << 28)	/* sbintstatus Interrupt */
#define I_CHIPACTIVE	(1 << 29)	/* chip from doze to active state */
#define I_SRESET	(1 << 30)	/* CCCR RES interrupt */
#define I_IOE2		(1U << 31)	/* CCCR IOE2 Bit Changed */
#define	I_ERRORS	(I_PC | I_PD | I_DE | I_RU | I_RO | I_XU)
#define I_DMA		(I_RI | I_XI | I_ERRORS)

/* corecontrol */
#define CC_CISRDY		(1 << 0)	/* CIS Ready */
#define CC_BPRESEN		(1 << 1)	/* CCCR RES signal */
#define CC_F2RDY		(1 << 2)	/* set CCCR IOR2 bit */
#define CC_CLRPADSISO		(1 << 3)	/* clear SDIO pads isolation */
#define CC_XMTDATAAVAIL_MODE	(1 << 4)
#define CC_XMTDATAAVAIL_CTRL	(1 << 5)

/* SDA_FRAMECTRL */
#define SFC_RF_TERM	(1 << 0)	/* Read Frame Terminate */
#define SFC_WF_TERM	(1 << 1)	/* Write Frame Terminate */
#define SFC_CRC4WOOS	(1 << 2)	/* CRC error for write out of sync */
#define SFC_ABORTALL	(1 << 3)	/* Abort all in-progress frames */

/* HW frame tag */
#define SDPCM_FRAMETAG_LEN	4	/* 2 bytes len, 2 bytes check val */

/* Total length of frame header for dongle protocol */
#define SDPCM_HDRLEN	(SDPCM_FRAMETAG_LEN + SDPCM_SWHEADER_LEN)
#define SDPCM_RESERVE	(SDPCM_HDRLEN + BRCMF_SDALIGN)

/*
 * Software allocation of To SB Mailbox resources
 */

/* tosbmailbox bits corresponding to intstatus bits */
#define SMB_NAK		(1 << 0)	/* Frame NAK */
#define SMB_INT_ACK	(1 << 1)	/* Host Interrupt ACK */
#define SMB_USE_OOB	(1 << 2)	/* Use OOB Wakeup */
#define SMB_DEV_INT	(1 << 3)	/* Miscellaneous Interrupt */

/* tosbmailboxdata */
#define SMB_DATA_VERSION_SHIFT	16	/* host protocol version */

/*
 * Software allocation of To Host Mailbox resources
 */

/* intstatus bits */
#define I_HMB_FC_STATE	I_HMB_SW0	/* Flow Control State */
#define I_HMB_FC_CHANGE	I_HMB_SW1	/* Flow Control State Changed */
#define I_HMB_FRAME_IND	I_HMB_SW2	/* Frame Indication */
#define I_HMB_HOST_INT	I_HMB_SW3	/* Miscellaneous Interrupt */

/* tohostmailboxdata */
#define HMB_DATA_NAKHANDLED	1	/* retransmit NAK'd frame */
#define HMB_DATA_DEVREADY	2	/* talk to host after enable */
#define HMB_DATA_FC		4	/* per prio flowcontrol update flag */
#define HMB_DATA_FWREADY	8	/* fw ready for protocol activity */

#define HMB_DATA_FCDATA_MASK	0xff000000
#define HMB_DATA_FCDATA_SHIFT	24

#define HMB_DATA_VERSION_MASK	0x00ff0000
#define HMB_DATA_VERSION_SHIFT	16

/*
 * Software-defined protocol header
 */

/* Current protocol version */
#define SDPCM_PROT_VERSION	4

/* SW frame header */
#define SDPCM_PACKET_SEQUENCE(p)	(((u8 *)p)[0] & 0xff)

#define SDPCM_CHANNEL_MASK		0x00000f00
#define SDPCM_CHANNEL_SHIFT		8
#define SDPCM_PACKET_CHANNEL(p)		(((u8 *)p)[1] & 0x0f)

#define SDPCM_NEXTLEN_OFFSET		2

/* Data Offset from SOF (HW Tag, SW Tag, Pad) */
#define SDPCM_DOFFSET_OFFSET		3	/* Data Offset */
#define SDPCM_DOFFSET_VALUE(p)		(((u8 *)p)[SDPCM_DOFFSET_OFFSET] & 0xff)
#define SDPCM_DOFFSET_MASK		0xff000000
#define SDPCM_DOFFSET_SHIFT		24
#define SDPCM_FCMASK_OFFSET		4	/* Flow control */
#define SDPCM_FCMASK_VALUE(p)		(((u8 *)p)[SDPCM_FCMASK_OFFSET] & 0xff)
#define SDPCM_WINDOW_OFFSET		5	/* Credit based fc */
#define SDPCM_WINDOW_VALUE(p)		(((u8 *)p)[SDPCM_WINDOW_OFFSET] & 0xff)

#define SDPCM_SWHEADER_LEN	8	/* SW header is 64 bits */

/* logical channel numbers */
#define SDPCM_CONTROL_CHANNEL	0	/* Control channel Id */
#define SDPCM_EVENT_CHANNEL	1	/* Asyc Event Indication Channel Id */
#define SDPCM_DATA_CHANNEL	2	/* Data Xmit/Recv Channel Id */
#define SDPCM_GLOM_CHANNEL	3	/* For coalesced packets */
#define SDPCM_TEST_CHANNEL	15	/* Reserved for test/debug packets */

#define SDPCM_SEQUENCE_WRAP	256	/* wrap-around val for 8bit frame seq */

#define SDPCM_GLOMDESC(p)	(((u8 *)p)[1] & 0x80)

/*
 * Shared structure between dongle and the host.
 * The structure contains pointers to trap or assert information.
 */
#define SDPCM_SHARED_VERSION       0x0002
#define SDPCM_SHARED_VERSION_MASK  0x00FF
#define SDPCM_SHARED_ASSERT_BUILT  0x0100
#define SDPCM_SHARED_ASSERT        0x0200
#define SDPCM_SHARED_TRAP          0x0400

/* Space for header read, limit for data packets */
#define MAX_HDR_READ	(1 << 6)
#define MAX_RX_DATASZ	2048

/* Maximum milliseconds to wait for F2 to come up */
#define BRCMF_WAIT_F2RDY	3000

/* Bump up limit on waiting for HT to account for first startup;
 * if the image is doing a CRC calculation before programming the PMU
 * for HT availability, it could take a couple hundred ms more, so
 * max out at a 1 second (1000000us).
 */
#undef PMU_MAX_TRANSITION_DLY
#define PMU_MAX_TRANSITION_DLY 1000000

/* Value for ChipClockCSR during initial setup */
#define BRCMF_INIT_CLKCTL1	(SBSDIO_FORCE_HW_CLKREQ_OFF |	\
					SBSDIO_ALP_AVAIL_REQ)

/* Flags for SDH calls */
#define F2SYNC	(SDIO_REQ_4BYTE | SDIO_REQ_FIXED)

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#define BRCMFMAC_FW_NAME	"brcm/brcmfmac.bin"
#define BRCMFMAC_NV_NAME	"brcm/brcmfmac.txt"
MODULE_FIRMWARE(BRCMFMAC_FW_NAME);
MODULE_FIRMWARE(BRCMFMAC_NV_NAME);

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/*
 * Conversion of 802.1D priority to precedence level
 */
static uint prio2prec(u32 prio)
{
	return (prio == PRIO_8021D_NONE || prio == PRIO_8021D_BE) ?
	       (prio^2) : prio;
}

/* core registers */
struct sdpcmd_regs {
	u32 corecontrol;		/* 0x00, rev8 */
	u32 corestatus;			/* rev8 */
	u32 PAD[1];
	u32 biststatus;			/* rev8 */

	/* PCMCIA access */
	u16 pcmciamesportaladdr;	/* 0x010, rev8 */
	u16 PAD[1];
	u16 pcmciamesportalmask;	/* rev8 */
	u16 PAD[1];
	u16 pcmciawrframebc;		/* rev8 */
	u16 PAD[1];
	u16 pcmciaunderflowtimer;	/* rev8 */
	u16 PAD[1];

	/* interrupt */
	u32 intstatus;			/* 0x020, rev8 */
	u32 hostintmask;		/* rev8 */
	u32 intmask;			/* rev8 */
	u32 sbintstatus;		/* rev8 */
	u32 sbintmask;			/* rev8 */
	u32 funcintmask;		/* rev4 */
	u32 PAD[2];
	u32 tosbmailbox;		/* 0x040, rev8 */
	u32 tohostmailbox;		/* rev8 */
	u32 tosbmailboxdata;		/* rev8 */
	u32 tohostmailboxdata;		/* rev8 */

	/* synchronized access to registers in SDIO clock domain */
	u32 sdioaccess;			/* 0x050, rev8 */
	u32 PAD[3];

	/* PCMCIA frame control */
	u8 pcmciaframectrl;		/* 0x060, rev8 */
	u8 PAD[3];
	u8 pcmciawatermark;		/* rev8 */
	u8 PAD[155];

	/* interrupt batching control */
	u32 intrcvlazy;			/* 0x100, rev8 */
	u32 PAD[3];

	/* counters */
	u32 cmd52rd;			/* 0x110, rev8 */
	u32 cmd52wr;			/* rev8 */
	u32 cmd53rd;			/* rev8 */
	u32 cmd53wr;			/* rev8 */
	u32 abort;			/* rev8 */
	u32 datacrcerror;		/* rev8 */
	u32 rdoutofsync;		/* rev8 */
	u32 wroutofsync;		/* rev8 */
	u32 writebusy;			/* rev8 */
	u32 readwait;			/* rev8 */
	u32 readterm;			/* rev8 */
	u32 writeterm;			/* rev8 */
	u32 PAD[40];
	u32 clockctlstatus;		/* rev8 */
	u32 PAD[7];

	u32 PAD[128];			/* DMA engines */

	/* SDIO/PCMCIA CIS region */
	char cis[512];			/* 0x400-0x5ff, rev6 */

	/* PCMCIA function control registers */
	char pcmciafcr[256];		/* 0x600-6ff, rev6 */
	u16 PAD[55];

	/* PCMCIA backplane access */
	u16 backplanecsr;		/* 0x76E, rev6 */
	u16 backplaneaddr0;		/* rev6 */
	u16 backplaneaddr1;		/* rev6 */
	u16 backplaneaddr2;		/* rev6 */
	u16 backplaneaddr3;		/* rev6 */
	u16 backplanedata0;		/* rev6 */
	u16 backplanedata1;		/* rev6 */
	u16 backplanedata2;		/* rev6 */
	u16 backplanedata3;		/* rev6 */
	u16 PAD[31];

	/* sprom "size" & "blank" info */
	u16 spromstatus;		/* 0x7BE, rev2 */
	u32 PAD[464];

	u16 PAD[0x80];
};

#ifdef BCMDBG
/* Device console log buffer state */
struct brcmf_console {
	uint count;		/* Poll interval msec counter */
	uint log_addr;		/* Log struct address (fixed) */
	struct rte_log_le log_le;	/* Log struct (host copy) */
	uint bufsize;		/* Size of log buffer */
	u8 *buf;		/* Log buffer (host copy) */
	uint last;		/* Last buffer read index */
};
#endif				/* BCMDBG */

struct sdpcm_shared {
	u32 flags;
	u32 trap_addr;
	u32 assert_exp_addr;
	u32 assert_file_addr;
	u32 assert_line;
	u32 console_addr;	/* Address of struct rte_console */
	u32 msgtrace_addr;
	u8 tag[32];
};

struct sdpcm_shared_le {
	__le32 flags;
	__le32 trap_addr;
	__le32 assert_exp_addr;
	__le32 assert_file_addr;
	__le32 assert_line;
	__le32 console_addr;	/* Address of struct rte_console */
	__le32 msgtrace_addr;
	u8 tag[32];
};


/* misc chip info needed by some of the routines */
/* Private data for SDIO bus interaction */
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struct brcmf_sdio {
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	struct brcmf_pub *drvr;

	struct brcmf_sdio_dev *sdiodev;	/* sdio device handler */
	struct chip_info *ci;	/* Chip info struct */
	char *vars;		/* Variables (from CIS and/or other) */
	uint varsz;		/* Size of variables buffer */

	u32 ramsize;		/* Size of RAM in SOCRAM (bytes) */

	u32 hostintmask;	/* Copy of Host Interrupt Mask */
	u32 intstatus;	/* Intstatus bits (events) pending */
	bool dpc_sched;		/* Indicates DPC schedule (intrpt rcvd) */
	bool fcstate;		/* State of dongle flow-control */

	uint blocksize;		/* Block size of SDIO transfers */
	uint roundup;		/* Max roundup limit */

	struct pktq txq;	/* Queue length used for flow-control */
	u8 flowcontrol;	/* per prio flow control bitmask */
	u8 tx_seq;		/* Transmit sequence number (next) */
	u8 tx_max;		/* Maximum transmit sequence allowed */

	u8 hdrbuf[MAX_HDR_READ + BRCMF_SDALIGN];
	u8 *rxhdr;		/* Header of current rx frame (in hdrbuf) */
	u16 nextlen;		/* Next Read Len from last header */
	u8 rx_seq;		/* Receive sequence number (expected) */
	bool rxskip;		/* Skip receive (awaiting NAK ACK) */

	uint rxbound;		/* Rx frames to read before resched */
	uint txbound;		/* Tx frames to send before resched */
	uint txminmax;

	struct sk_buff *glomd;	/* Packet containing glomming descriptor */
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	struct sk_buff_head glom; /* Packet list for glommed superframe */
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	uint glomerr;		/* Glom packet read errors */

	u8 *rxbuf;		/* Buffer for receiving control packets */
	uint rxblen;		/* Allocated length of rxbuf */
	u8 *rxctl;		/* Aligned pointer into rxbuf */
	u8 *databuf;		/* Buffer for receiving big glom packet */
	u8 *dataptr;		/* Aligned pointer into databuf */
	uint rxlen;		/* Length of valid data in buffer */

	u8 sdpcm_ver;	/* Bus protocol reported by dongle */

	bool intr;		/* Use interrupts */
	bool poll;		/* Use polling */
	bool ipend;		/* Device interrupt is pending */
	uint intrcount;		/* Count of device interrupt callbacks */
	uint lastintrs;		/* Count as of last watchdog timer */
	uint spurious;		/* Count of spurious interrupts */
	uint pollrate;		/* Ticks between device polls */
	uint polltick;		/* Tick counter */
	uint pollcnt;		/* Count of active polls */

#ifdef BCMDBG
	uint console_interval;
	struct brcmf_console console;	/* Console output polling support */
	uint console_addr;	/* Console address from shared struct */
#endif				/* BCMDBG */

	uint regfails;		/* Count of R_REG failures */

	uint clkstate;		/* State of sd and backplane clock(s) */
	bool activity;		/* Activity flag for clock down */
	s32 idletime;		/* Control for activity timeout */
	s32 idlecount;	/* Activity timeout counter */
	s32 idleclock;	/* How to set bus driver when idle */
	s32 sd_rxchain;
	bool use_rxchain;	/* If brcmf should use PKT chains */
	bool sleeping;		/* Is SDIO bus sleeping? */
	bool rxflow_mode;	/* Rx flow control mode */
	bool rxflow;		/* Is rx flow control on */
	bool alp_only;		/* Don't use HT clock (ALP only) */
/* Field to decide if rx of control frames happen in rxbuf or lb-pool */
	bool usebufpool;

	/* Some additional counters */
	uint tx_sderrs;		/* Count of tx attempts with sd errors */
	uint fcqueued;		/* Tx packets that got queued */
	uint rxrtx;		/* Count of rtx requests (NAK to dongle) */
	uint rx_toolong;	/* Receive frames too long to receive */
	uint rxc_errors;	/* SDIO errors when reading control frames */
	uint rx_hdrfail;	/* SDIO errors on header reads */
	uint rx_badhdr;		/* Bad received headers (roosync?) */
	uint rx_badseq;		/* Mismatched rx sequence number */
	uint fc_rcvd;		/* Number of flow-control events received */
	uint fc_xoff;		/* Number which turned on flow-control */
	uint fc_xon;		/* Number which turned off flow-control */
	uint rxglomfail;	/* Failed deglom attempts */
	uint rxglomframes;	/* Number of glom frames (superframes) */
	uint rxglompkts;	/* Number of packets from glom frames */
	uint f2rxhdrs;		/* Number of header reads */
	uint f2rxdata;		/* Number of frame data reads */
	uint f2txdata;		/* Number of f2 frame writes */
	uint f1regdata;		/* Number of f1 register accesses */

	u8 *ctrl_frame_buf;
	u32 ctrl_frame_len;
	bool ctrl_frame_stat;

	spinlock_t txqlock;
	wait_queue_head_t ctrl_wait;
	wait_queue_head_t dcmd_resp_wait;

	struct timer_list timer;
	struct completion watchdog_wait;
	struct task_struct *watchdog_tsk;
	bool wd_timer_valid;
	uint save_ms;

	struct task_struct *dpc_tsk;
	struct completion dpc_wait;

	struct semaphore sdsem;

	const struct firmware *firmware;
	u32 fw_ptr;
};

/* clkstate */
#define CLK_NONE	0
#define CLK_SDONLY	1
#define CLK_PENDING	2	/* Not used yet */
#define CLK_AVAIL	3

#ifdef BCMDBG
static int qcount[NUMPRIO];
static int tx_packets[NUMPRIO];
#endif				/* BCMDBG */

#define SDIO_DRIVE_STRENGTH	6	/* in milliamps */

#define RETRYCHAN(chan) ((chan) == SDPCM_EVENT_CHANNEL)

/* Retry count for register access failures */
static const uint retry_limit = 2;

/* Limit on rounding up frames */
static const uint max_roundup = 512;

#define ALIGNMENT  4

static void pkt_align(struct sk_buff *p, int len, int align)
{
	uint datalign;
	datalign = (unsigned long)(p->data);
	datalign = roundup(datalign, (align)) - datalign;
	if (datalign)
		skb_pull(p, datalign);
	__skb_trim(p, len);
}

/* To check if there's window offered */
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static bool data_ok(struct brcmf_sdio *bus)
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{
	return (u8)(bus->tx_max - bus->tx_seq) != 0 &&
	       ((u8)(bus->tx_max - bus->tx_seq) & 0x80) == 0;
}

/*
 * Reads a register in the SDIO hardware block. This block occupies a series of
 * adresses on the 32 bit backplane bus.
 */
static void
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r_sdreg32(struct brcmf_sdio *bus, u32 *regvar, u32 reg_offset, u32 *retryvar)
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{
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	u8 idx = brcmf_sdio_chip_getinfidx(bus->ci, BCMA_CORE_SDIO_DEV);
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	*retryvar = 0;
	do {
		*regvar = brcmf_sdcard_reg_read(bus->sdiodev,
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				bus->ci->c_inf[idx].base + reg_offset,
				sizeof(u32));
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	} while (brcmf_sdcard_regfail(bus->sdiodev) &&
		 (++(*retryvar) <= retry_limit));
	if (*retryvar) {
		bus->regfails += (*retryvar-1);
		if (*retryvar > retry_limit) {
			brcmf_dbg(ERROR, "FAILED READ %Xh\n", reg_offset);
			*regvar = 0;
		}
	}
}

static void
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w_sdreg32(struct brcmf_sdio *bus, u32 regval, u32 reg_offset, u32 *retryvar)
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{
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	u8 idx = brcmf_sdio_chip_getinfidx(bus->ci, BCMA_CORE_SDIO_DEV);
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	*retryvar = 0;
	do {
		brcmf_sdcard_reg_write(bus->sdiodev,
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				       bus->ci->c_inf[idx].base + reg_offset,
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				       sizeof(u32), regval);
	} while (brcmf_sdcard_regfail(bus->sdiodev) &&
		 (++(*retryvar) <= retry_limit));
	if (*retryvar) {
		bus->regfails += (*retryvar-1);
		if (*retryvar > retry_limit)
			brcmf_dbg(ERROR, "FAILED REGISTER WRITE %Xh\n",
				  reg_offset);
	}
}

#define PKT_AVAILABLE()		(intstatus & I_HMB_FRAME_IND)

#define HOSTINTMASK		(I_HMB_SW_MASK | I_CHIPACTIVE)

/* Packet free applicable unconditionally for sdio and sdspi.
 * Conditional if bufpool was present for gspi bus.
 */
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static void brcmf_sdbrcm_pktfree2(struct brcmf_sdio *bus, struct sk_buff *pkt)
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{
	if (bus->usebufpool)
		brcmu_pkt_buf_free_skb(pkt);
}

/* Turn backplane clock on or off */
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static int brcmf_sdbrcm_htclk(struct brcmf_sdio *bus, bool on, bool pendok)
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{
	int err;
	u8 clkctl, clkreq, devctl;
	unsigned long timeout;

	brcmf_dbg(TRACE, "Enter\n");

	clkctl = 0;

	if (on) {
		/* Request HT Avail */
		clkreq =
		    bus->alp_only ? SBSDIO_ALP_AVAIL_REQ : SBSDIO_HT_AVAIL_REQ;

		brcmf_sdcard_cfg_write(bus->sdiodev, SDIO_FUNC_1,
				       SBSDIO_FUNC1_CHIPCLKCSR, clkreq, &err);
		if (err) {
			brcmf_dbg(ERROR, "HT Avail request error: %d\n", err);
			return -EBADE;
		}

		/* Check current status */
		clkctl = brcmf_sdcard_cfg_read(bus->sdiodev, SDIO_FUNC_1,
					       SBSDIO_FUNC1_CHIPCLKCSR, &err);
		if (err) {
			brcmf_dbg(ERROR, "HT Avail read error: %d\n", err);
			return -EBADE;
		}

		/* Go to pending and await interrupt if appropriate */
		if (!SBSDIO_CLKAV(clkctl, bus->alp_only) && pendok) {
			/* Allow only clock-available interrupt */
			devctl = brcmf_sdcard_cfg_read(bus->sdiodev,
					SDIO_FUNC_1,
					SBSDIO_DEVICE_CTL, &err);
			if (err) {
				brcmf_dbg(ERROR, "Devctl error setting CA: %d\n",
					  err);
				return -EBADE;
			}

			devctl |= SBSDIO_DEVCTL_CA_INT_ONLY;
			brcmf_sdcard_cfg_write(bus->sdiodev, SDIO_FUNC_1,
					       SBSDIO_DEVICE_CTL, devctl, &err);
			brcmf_dbg(INFO, "CLKCTL: set PENDING\n");
			bus->clkstate = CLK_PENDING;

			return 0;
		} else if (bus->clkstate == CLK_PENDING) {
			/* Cancel CA-only interrupt filter */
			devctl =
			    brcmf_sdcard_cfg_read(bus->sdiodev, SDIO_FUNC_1,
						  SBSDIO_DEVICE_CTL, &err);
			devctl &= ~SBSDIO_DEVCTL_CA_INT_ONLY;
			brcmf_sdcard_cfg_write(bus->sdiodev, SDIO_FUNC_1,
				SBSDIO_DEVICE_CTL, devctl, &err);
		}

		/* Otherwise, wait here (polling) for HT Avail */
		timeout = jiffies +
			  msecs_to_jiffies(PMU_MAX_TRANSITION_DLY/1000);
		while (!SBSDIO_CLKAV(clkctl, bus->alp_only)) {
			clkctl = brcmf_sdcard_cfg_read(bus->sdiodev,
						       SDIO_FUNC_1,
						       SBSDIO_FUNC1_CHIPCLKCSR,
						       &err);
			if (time_after(jiffies, timeout))
				break;
			else
				usleep_range(5000, 10000);
		}
		if (err) {
			brcmf_dbg(ERROR, "HT Avail request error: %d\n", err);
			return -EBADE;
		}
		if (!SBSDIO_CLKAV(clkctl, bus->alp_only)) {
			brcmf_dbg(ERROR, "HT Avail timeout (%d): clkctl 0x%02x\n",
				  PMU_MAX_TRANSITION_DLY, clkctl);
			return -EBADE;
		}

		/* Mark clock available */
		bus->clkstate = CLK_AVAIL;
		brcmf_dbg(INFO, "CLKCTL: turned ON\n");

#if defined(BCMDBG)
		if (bus->alp_only != true) {
			if (SBSDIO_ALPONLY(clkctl))
				brcmf_dbg(ERROR, "HT Clock should be on\n");
		}
#endif				/* defined (BCMDBG) */

		bus->activity = true;
	} else {
		clkreq = 0;

		if (bus->clkstate == CLK_PENDING) {
			/* Cancel CA-only interrupt filter */
			devctl = brcmf_sdcard_cfg_read(bus->sdiodev,
					SDIO_FUNC_1,
					SBSDIO_DEVICE_CTL, &err);
			devctl &= ~SBSDIO_DEVCTL_CA_INT_ONLY;
			brcmf_sdcard_cfg_write(bus->sdiodev, SDIO_FUNC_1,
				SBSDIO_DEVICE_CTL, devctl, &err);
		}

		bus->clkstate = CLK_SDONLY;
		brcmf_sdcard_cfg_write(bus->sdiodev, SDIO_FUNC_1,
			SBSDIO_FUNC1_CHIPCLKCSR, clkreq, &err);
		brcmf_dbg(INFO, "CLKCTL: turned OFF\n");
		if (err) {
			brcmf_dbg(ERROR, "Failed access turning clock off: %d\n",
				  err);
			return -EBADE;
		}
	}
	return 0;
}

/* Change idle/active SD state */
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static int brcmf_sdbrcm_sdclk(struct brcmf_sdio *bus, bool on)
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{
	brcmf_dbg(TRACE, "Enter\n");

	if (on)
		bus->clkstate = CLK_SDONLY;
	else
		bus->clkstate = CLK_NONE;

	return 0;
}

/* Transition SD and backplane clock readiness */
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static int brcmf_sdbrcm_clkctl(struct brcmf_sdio *bus, uint target, bool pendok)
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{
#ifdef BCMDBG
	uint oldstate = bus->clkstate;
#endif				/* BCMDBG */

	brcmf_dbg(TRACE, "Enter\n");

	/* Early exit if we're already there */
	if (bus->clkstate == target) {
		if (target == CLK_AVAIL) {
			brcmf_sdbrcm_wd_timer(bus, BRCMF_WD_POLL_MS);
			bus->activity = true;
		}
		return 0;
	}

	switch (target) {
	case CLK_AVAIL:
		/* Make sure SD clock is available */
		if (bus->clkstate == CLK_NONE)
			brcmf_sdbrcm_sdclk(bus, true);
		/* Now request HT Avail on the backplane */
		brcmf_sdbrcm_htclk(bus, true, pendok);
		brcmf_sdbrcm_wd_timer(bus, BRCMF_WD_POLL_MS);
		bus->activity = true;
		break;

	case CLK_SDONLY:
		/* Remove HT request, or bring up SD clock */
		if (bus->clkstate == CLK_NONE)
			brcmf_sdbrcm_sdclk(bus, true);
		else if (bus->clkstate == CLK_AVAIL)
			brcmf_sdbrcm_htclk(bus, false, false);
		else
			brcmf_dbg(ERROR, "request for %d -> %d\n",
				  bus->clkstate, target);
		brcmf_sdbrcm_wd_timer(bus, BRCMF_WD_POLL_MS);
		break;

	case CLK_NONE:
		/* Make sure to remove HT request */
		if (bus->clkstate == CLK_AVAIL)
			brcmf_sdbrcm_htclk(bus, false, false);
		/* Now remove the SD clock */
		brcmf_sdbrcm_sdclk(bus, false);
		brcmf_sdbrcm_wd_timer(bus, 0);
		break;
	}
#ifdef BCMDBG
	brcmf_dbg(INFO, "%d -> %d\n", oldstate, bus->clkstate);
#endif				/* BCMDBG */

	return 0;
}

860
static int brcmf_sdbrcm_bussleep(struct brcmf_sdio *bus, bool sleep)
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{
	uint retries = 0;

	brcmf_dbg(INFO, "request %s (currently %s)\n",
		  sleep ? "SLEEP" : "WAKE",
		  bus->sleeping ? "SLEEP" : "WAKE");

	/* Done if we're already in the requested state */
	if (sleep == bus->sleeping)
		return 0;

	/* Going to sleep: set the alarm and turn off the lights... */
	if (sleep) {
		/* Don't sleep if something is pending */
		if (bus->dpc_sched || bus->rxskip || pktq_len(&bus->txq))
			return -EBUSY;

		/* Make sure the controller has the bus up */
		brcmf_sdbrcm_clkctl(bus, CLK_AVAIL, false);

		/* Tell device to start using OOB wakeup */
		w_sdreg32(bus, SMB_USE_OOB,
			  offsetof(struct sdpcmd_regs, tosbmailbox), &retries);
		if (retries > retry_limit)
			brcmf_dbg(ERROR, "CANNOT SIGNAL CHIP, WILL NOT WAKE UP!!\n");

		/* Turn off our contribution to the HT clock request */
		brcmf_sdbrcm_clkctl(bus, CLK_SDONLY, false);

		brcmf_sdcard_cfg_write(bus->sdiodev, SDIO_FUNC_1,
			SBSDIO_FUNC1_CHIPCLKCSR,
			SBSDIO_FORCE_HW_CLKREQ_OFF, NULL);

		/* Isolate the bus */
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		brcmf_sdcard_cfg_write(bus->sdiodev, SDIO_FUNC_1,
			SBSDIO_DEVICE_CTL,
			SBSDIO_DEVCTL_PADS_ISO, NULL);
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		/* Change state */
		bus->sleeping = true;

	} else {
		/* Waking up: bus power up is ok, set local state */

		brcmf_sdcard_cfg_write(bus->sdiodev, SDIO_FUNC_1,
			SBSDIO_FUNC1_CHIPCLKCSR, 0, NULL);

		/* Make sure the controller has the bus up */
		brcmf_sdbrcm_clkctl(bus, CLK_AVAIL, false);

		/* Send misc interrupt to indicate OOB not needed */
		w_sdreg32(bus, 0, offsetof(struct sdpcmd_regs, tosbmailboxdata),
			  &retries);
		if (retries <= retry_limit)
			w_sdreg32(bus, SMB_DEV_INT,
				  offsetof(struct sdpcmd_regs, tosbmailbox),
				  &retries);

		if (retries > retry_limit)
			brcmf_dbg(ERROR, "CANNOT SIGNAL CHIP TO CLEAR OOB!!\n");

		/* Make sure we have SD bus access */
		brcmf_sdbrcm_clkctl(bus, CLK_SDONLY, false);

		/* Change state */
		bus->sleeping = false;
	}

	return 0;
}

932
static void bus_wake(struct brcmf_sdio *bus)
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{
	if (bus->sleeping)
		brcmf_sdbrcm_bussleep(bus, false);
}

938
static u32 brcmf_sdbrcm_hostmail(struct brcmf_sdio *bus)
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{
	u32 intstatus = 0;
	u32 hmb_data;
	u8 fcbits;
	uint retries = 0;

	brcmf_dbg(TRACE, "Enter\n");

	/* Read mailbox data and ack that we did so */
	r_sdreg32(bus, &hmb_data,
		  offsetof(struct sdpcmd_regs, tohostmailboxdata), &retries);

	if (retries <= retry_limit)
		w_sdreg32(bus, SMB_INT_ACK,
			  offsetof(struct sdpcmd_regs, tosbmailbox), &retries);
	bus->f1regdata += 2;

	/* Dongle recomposed rx frames, accept them again */
	if (hmb_data & HMB_DATA_NAKHANDLED) {
		brcmf_dbg(INFO, "Dongle reports NAK handled, expect rtx of %d\n",
			  bus->rx_seq);
		if (!bus->rxskip)
			brcmf_dbg(ERROR, "unexpected NAKHANDLED!\n");

		bus->rxskip = false;
		intstatus |= I_HMB_FRAME_IND;
	}

	/*
	 * DEVREADY does not occur with gSPI.
	 */
	if (hmb_data & (HMB_DATA_DEVREADY | HMB_DATA_FWREADY)) {
		bus->sdpcm_ver =
		    (hmb_data & HMB_DATA_VERSION_MASK) >>
		    HMB_DATA_VERSION_SHIFT;
		if (bus->sdpcm_ver != SDPCM_PROT_VERSION)
			brcmf_dbg(ERROR, "Version mismatch, dongle reports %d, "
				  "expecting %d\n",
				  bus->sdpcm_ver, SDPCM_PROT_VERSION);
		else
			brcmf_dbg(INFO, "Dongle ready, protocol version %d\n",
				  bus->sdpcm_ver);
	}

	/*
	 * Flow Control has been moved into the RX headers and this out of band
	 * method isn't used any more.
	 * remaining backward compatible with older dongles.
	 */
	if (hmb_data & HMB_DATA_FC) {
		fcbits = (hmb_data & HMB_DATA_FCDATA_MASK) >>
							HMB_DATA_FCDATA_SHIFT;

		if (fcbits & ~bus->flowcontrol)
			bus->fc_xoff++;

		if (bus->flowcontrol & ~fcbits)
			bus->fc_xon++;

		bus->fc_rcvd++;
		bus->flowcontrol = fcbits;
	}

	/* Shouldn't be any others */
	if (hmb_data & ~(HMB_DATA_DEVREADY |
			 HMB_DATA_NAKHANDLED |
			 HMB_DATA_FC |
			 HMB_DATA_FWREADY |
			 HMB_DATA_FCDATA_MASK | HMB_DATA_VERSION_MASK))
		brcmf_dbg(ERROR, "Unknown mailbox data content: 0x%02x\n",
			  hmb_data);

	return intstatus;
}

1014
static void brcmf_sdbrcm_rxfail(struct brcmf_sdio *bus, bool abort, bool rtx)
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{
	uint retries = 0;
	u16 lastrbc;
	u8 hi, lo;
	int err;

	brcmf_dbg(ERROR, "%sterminate frame%s\n",
		  abort ? "abort command, " : "",
		  rtx ? ", send NAK" : "");

	if (abort)
		brcmf_sdcard_abort(bus->sdiodev, SDIO_FUNC_2);

	brcmf_sdcard_cfg_write(bus->sdiodev, SDIO_FUNC_1,
			       SBSDIO_FUNC1_FRAMECTRL,
			       SFC_RF_TERM, &err);
	bus->f1regdata++;

	/* Wait until the packet has been flushed (device/FIFO stable) */
	for (lastrbc = retries = 0xffff; retries > 0; retries--) {
		hi = brcmf_sdcard_cfg_read(bus->sdiodev, SDIO_FUNC_1,
					   SBSDIO_FUNC1_RFRAMEBCHI, NULL);
		lo = brcmf_sdcard_cfg_read(bus->sdiodev, SDIO_FUNC_1,
					   SBSDIO_FUNC1_RFRAMEBCLO, NULL);
		bus->f1regdata += 2;

		if ((hi == 0) && (lo == 0))
			break;

		if ((hi > (lastrbc >> 8)) && (lo > (lastrbc & 0x00ff))) {
			brcmf_dbg(ERROR, "count growing: last 0x%04x now 0x%04x\n",
				  lastrbc, (hi << 8) + lo);
		}
		lastrbc = (hi << 8) + lo;
	}

	if (!retries)
		brcmf_dbg(ERROR, "count never zeroed: last 0x%04x\n", lastrbc);
	else
		brcmf_dbg(INFO, "flush took %d iterations\n", 0xffff - retries);

	if (rtx) {
		bus->rxrtx++;
		w_sdreg32(bus, SMB_NAK,
			  offsetof(struct sdpcmd_regs, tosbmailbox), &retries);

		bus->f1regdata++;
		if (retries <= retry_limit)
			bus->rxskip = true;
	}

	/* Clear partial in any case */
	bus->nextlen = 0;

	/* If we can't reach the device, signal failure */
	if (err || brcmf_sdcard_regfail(bus->sdiodev))
1071
		bus->drvr->bus_if->state = BRCMF_BUS_DOWN;
1072
1073
}

1074
/* copy a buffer into a pkt buffer chain */
1075
static uint brcmf_sdbrcm_glom_from_buf(struct brcmf_sdio *bus, uint len)
1076
1077
1078
1079
1080
1081
1082
1083
{
	uint n, ret = 0;
	struct sk_buff *p;
	u8 *buf;

	buf = bus->dataptr;

	/* copy the data */
1084
	skb_queue_walk(&bus->glom, p) {
1085
1086
1087
1088
1089
		n = min_t(uint, p->len, len);
		memcpy(p->data, buf, n);
		buf += n;
		len -= n;
		ret += n;
1090
1091
		if (!len)
			break;
1092
1093
1094
1095
1096
	}

	return ret;
}

1097
/* return total length of buffer chain */
1098
static uint brcmf_sdbrcm_glom_len(struct brcmf_sdio *bus)
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
{
	struct sk_buff *p;
	uint total;

	total = 0;
	skb_queue_walk(&bus->glom, p)
		total += p->len;
	return total;
}

1109
static void brcmf_sdbrcm_free_glom(struct brcmf_sdio *bus)
1110
1111
1112
1113
1114
1115
1116
1117
1118
{
	struct sk_buff *cur, *next;

	skb_queue_walk_safe(&bus->glom, cur, next) {
		skb_unlink(cur, &bus->glom);
		brcmu_pkt_buf_free_skb(cur);
	}
}

1119
static u8 brcmf_sdbrcm_rxglom(struct brcmf_sdio *bus, u8 rxseq)
1120
1121
1122
1123
1124
{
	u16 dlen, totlen;
	u8 *dptr, num = 0;

	u16 sublen, check;
1125
	struct sk_buff *pfirst, *pnext;
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136

	int errcode;
	u8 chan, seq, doff, sfdoff;
	u8 txmax;

	int ifidx = 0;
	bool usechain = bus->use_rxchain;

	/* If packets, issue read(s) and send up packet chain */
	/* Return sequence numbers consumed? */

1137
1138
	brcmf_dbg(TRACE, "start: glomd %p glom %p\n",
		  bus->glomd, skb_peek(&bus->glom));
1139
1140
1141

	/* If there's a descriptor, generate the packet chain */
	if (bus->glomd) {
1142
		pfirst = pnext = NULL;
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
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1158
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1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
		dlen = (u16) (bus->glomd->len);
		dptr = bus->glomd->data;
		if (!dlen || (dlen & 1)) {
			brcmf_dbg(ERROR, "bad glomd len(%d), ignore descriptor\n",
				  dlen);
			dlen = 0;
		}

		for (totlen = num = 0; dlen; num++) {
			/* Get (and move past) next length */
			sublen = get_unaligned_le16(dptr);
			dlen -= sizeof(u16);
			dptr += sizeof(u16);
			if ((sublen < SDPCM_HDRLEN) ||
			    ((num == 0) && (sublen < (2 * SDPCM_HDRLEN)))) {
				brcmf_dbg(ERROR, "descriptor len %d bad: %d\n",
					  num, sublen);
				pnext = NULL;
				break;
			}
			if (sublen % BRCMF_SDALIGN) {
				brcmf_dbg(ERROR, "sublen %d not multiple of %d\n",
					  sublen, BRCMF_SDALIGN);
				usechain = false;
			}
			totlen += sublen;

			/* For last frame, adjust read len so total
				 is a block multiple */
			if (!dlen) {
				sublen +=
				    (roundup(totlen, bus->blocksize) - totlen);
				totlen = roundup(totlen, bus->blocksize);
			}

			/* Allocate/chain packet for next subframe */
			pnext = brcmu_pkt_buf_get_skb(sublen + BRCMF_SDALIGN);
			if (pnext == NULL) {
				brcmf_dbg(ERROR, "bcm_pkt_buf_get_skb failed, num %d len %d\n",
					  num, sublen);
				break;
			}
1185
			skb_queue_tail(&bus->glom, pnext);
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202

			/* Adhere to start alignment requirements */
			pkt_align(pnext, sublen, BRCMF_SDALIGN);
		}

		/* If all allocations succeeded, save packet chain
			 in bus structure */
		if (pnext) {
			brcmf_dbg(GLOM, "allocated %d-byte packet chain for %d subframes\n",
				  totlen, num);
			if (BRCMF_GLOM_ON() && bus->nextlen &&
			    totlen != bus->nextlen) {
				brcmf_dbg(GLOM, "glomdesc mismatch: nextlen %d glomdesc %d rxseq %d\n",
					  bus->nextlen, totlen, rxseq);
			}
			pfirst = pnext = NULL;
		} else {
1203
			brcmf_sdbrcm_free_glom(bus);
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
			num = 0;
		}

		/* Done with descriptor packet */
		brcmu_pkt_buf_free_skb(bus->glomd);
		bus->glomd = NULL;
		bus->nextlen = 0;
	}

	/* Ok -- either we just generated a packet chain,
		 or had one from before */
1215
	if (!skb_queue_empty(&bus->glom)) {
1216
1217
		if (BRCMF_GLOM_ON()) {
			brcmf_dbg(GLOM, "try superframe read, packet chain:\n");
1218
			skb_queue_walk(&bus->glom, pnext) {
1219
1220
1221
1222
1223
1224
				brcmf_dbg(GLOM, "    %p: %p len 0x%04x (%d)\n",
					  pnext, (u8 *) (pnext->data),
					  pnext->len, pnext->len);
			}
		}

1225
		pfirst = skb_peek(&bus->glom);
1226
		dlen = (u16) brcmf_sdbrcm_glom_len(bus);
1227
1228
1229
1230
1231
1232

		/* Do an SDIO read for the superframe.  Configurable iovar to
		 * read directly into the chained packet, or allocate a large
		 * packet and and copy into the chain.
		 */
		if (usechain) {
1233
			errcode = brcmf_sdcard_recv_chain(bus->sdiodev,
1234
					bus->sdiodev->sbwad,
1235
					SDIO_FUNC_2, F2SYNC, &bus->glom);
1236
1237
1238
		} else if (bus->dataptr) {
			errcode = brcmf_sdcard_recv_buf(bus->sdiodev,
					bus->sdiodev->sbwad,
1239
1240
					SDIO_FUNC_2, F2SYNC,
					bus->dataptr, dlen);
1241
			sublen = (u16) brcmf_sdbrcm_glom_from_buf(bus, dlen);
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
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1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
			if (sublen != dlen) {
				brcmf_dbg(ERROR, "FAILED TO COPY, dlen %d sublen %d\n",
					  dlen, sublen);
				errcode = -1;
			}
			pnext = NULL;
		} else {
			brcmf_dbg(ERROR, "COULDN'T ALLOC %d-BYTE GLOM, FORCE FAILURE\n",
				  dlen);
			errcode = -1;
		}
		bus->f2rxdata++;

		/* On failure, kill the superframe, allow a couple retries */
		if (errcode < 0) {
			brcmf_dbg(ERROR, "glom read of %d bytes failed: %d\n",
				  dlen, errcode);
			bus->drvr->rx_errors++;

			if (bus->glomerr++ < 3) {
				brcmf_sdbrcm_rxfail(bus, true, true);
			} else {
				bus->glomerr = 0;
				brcmf_sdbrcm_rxfail(bus, true, false);
				bus->rxglomfail++;
1267
				brcmf_sdbrcm_free_glom(bus);
1268
1269
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1272
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1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
			}
			return 0;
		}
#ifdef BCMDBG
		if (BRCMF_GLOM_ON()) {
			printk(KERN_DEBUG "SUPERFRAME:\n");
			print_hex_dump_bytes("", DUMP_PREFIX_OFFSET,
				pfirst->data, min_t(int, pfirst->len, 48));
		}
#endif

		/* Validate the superframe header */
		dptr = (u8 *) (pfirst->data);
		sublen = get_unaligned_le16(dptr);
		check = get_unaligned_le16(dptr + sizeof(u16));

		chan = SDPCM_PACKET_CHANNEL(&dptr[SDPCM_FRAMETAG_LEN]);
		seq = SDPCM_PACKET_SEQUENCE(&dptr[SDPCM_FRAMETAG_LEN]);
		bus->nextlen = dptr[SDPCM_FRAMETAG_LEN + SDPCM_NEXTLEN_OFFSET];
		if ((bus->nextlen << 4) > MAX_RX_DATASZ) {
			brcmf_dbg(INFO, "nextlen too large (%d) seq %d\n",
				  bus->nextlen, seq);
			bus->nextlen = 0;
		}
		doff = SDPCM_DOFFSET_VALUE(&dptr[SDPCM_FRAMETAG_LEN]);
		txmax = SDPCM_WINDOW_VALUE(&dptr[SDPCM_FRAMETAG_LEN]);

		errcode = 0;
		if ((u16)~(sublen ^ check)) {
			brcmf_dbg(ERROR, "(superframe): HW hdr error: len/check 0x%04x/0x%04x\n",
				  sublen, check);
			errcode = -1;
		} else if (roundup(sublen, bus->blocksize) != dlen) {
			brcmf_dbg(ERROR, "(superframe): len 0x%04x, rounded 0x%04x, expect 0x%04x\n",
				  sublen, roundup(sublen, bus->blocksize),
				  dlen);
			errcode = -1;
		} else if (SDPCM_PACKET_CHANNEL(&dptr[SDPCM_FRAMETAG_LEN]) !=
			   SDPCM_GLOM_CHANNEL) {
			brcmf_dbg(ERROR, "(superframe): bad channel %d\n",
				  SDPCM_PACKET_CHANNEL(
					  &dptr[SDPCM_FRAMETAG_LEN]));
			errcode = -1;
		} else if (SDPCM_GLOMDESC(&dptr[SDPCM_FRAMETAG_LEN])) {
			brcmf_dbg(ERROR, "(superframe): got 2nd descriptor?\n");
			errcode = -1;
		} else if ((doff < SDPCM_HDRLEN) ||
			   (doff > (pfirst->len - SDPCM_HDRLEN))) {
			brcmf_dbg(ERROR, "(superframe): Bad data offset %d: HW %d pkt %d min %d\n",
				  doff, sublen, pfirst->len, SDPCM_HDRLEN);
			errcode = -1;
		}

		/* Check sequence number of superframe SW header */
		if (rxseq != seq) {
			brcmf_dbg(INFO, "(superframe) rx_seq %d, expected %d\n",
				  seq, rxseq);
			bus->rx_badseq++;
			rxseq = seq;
		}

		/* Check window for sanity */
		if ((u8) (txmax - bus->tx_seq) > 0x40) {
			brcmf_dbg(ERROR, "unlikely tx max %d with tx_seq %d\n",
				  txmax, bus->tx_seq);
			txmax = bus->tx_seq + 2;
		}
		bus->tx_max = txmax;

		/* Remove superframe header, remember offset */
		skb_pull(pfirst, doff);
		sfdoff = doff;
1340
		num = 0;
1341
1342

		/* Validate all the subframe headers */
1343
1344
1345
1346
1347
		skb_queue_walk(&bus->glom, pnext) {
			/* leave when invalid subframe is found */
			if (errcode)
				break;

1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
			dptr = (u8 *) (pnext->data);
			dlen = (u16) (pnext->len);
			sublen = get_unaligned_le16(dptr);
			check = get_unaligned_le16(dptr + sizeof(u16));
			chan = SDPCM_PACKET_CHANNEL(&dptr[SDPCM_FRAMETAG_LEN]);
			doff = SDPCM_DOFFSET_VALUE(&dptr[SDPCM_FRAMETAG_LEN]);
#ifdef BCMDBG
			if (BRCMF_GLOM_ON()) {
				printk(KERN_DEBUG "subframe:\n");
				print_hex_dump_bytes("", DUMP_PREFIX_OFFSET,
						     dptr, 32);
			}
#endif

			if ((u16)~(sublen ^ check)) {
				brcmf_dbg(ERROR, "(subframe %d): HW hdr error: len/check 0x%04x/0x%04x\n",
					  num, sublen, check);
				errcode = -1;
			} else if ((sublen > dlen) || (sublen < SDPCM_HDRLEN)) {
				brcmf_dbg(ERROR, "(subframe %d): length mismatch: len 0x%04x, expect 0x%04x\n",
					  num, sublen, dlen);
				errcode = -1;
			} else if ((chan != SDPCM_DATA_CHANNEL) &&
				   (chan != SDPCM_EVENT_CHANNEL)) {
				brcmf_dbg(ERROR, "(subframe %d): bad channel %d\n",
					  num, chan);
				errcode = -1;
			} else if ((doff < SDPCM_HDRLEN) || (doff > sublen)) {
				brcmf_dbg(ERROR, "(subframe %d): Bad data offset %d: HW %d min %d\n",
					  num, doff, sublen, SDPCM_HDRLEN);
				errcode = -1;
			}
1380
1381
			/* increase the subframe count */
			num++;
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
		}

		if (errcode) {
			/* Terminate frame on error, request
				 a couple retries */
			if (bus->glomerr++ < 3) {
				/* Restore superframe header space */
				skb_push(pfirst, sfdoff);
				brcmf_sdbrcm_rxfail(bus, true, true);
			} else {
				bus->glomerr = 0;
				brcmf_sdbrcm_rxfail(bus, true, false);
				bus->rxglomfail++;
1395
				brcmf_sdbrcm_free_glom(bus);
1396
1397
1398
1399
1400
1401
1402
			}
			bus->nextlen = 0;
			return 0;
		}

		/* Basic SD framing looks ok - process each packet (header) */

1403
		skb_queue_walk_safe(&bus->glom, pfirst, pnext) {
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
			dptr = (u8 *) (pfirst->data);
			sublen = get_unaligned_le16(dptr);
			chan = SDPCM_PACKET_CHANNEL(&dptr[SDPCM_FRAMETAG_LEN]);
			seq = SDPCM_PACKET_SEQUENCE(&dptr[SDPCM_FRAMETAG_LEN]);
			doff = SDPCM_DOFFSET_VALUE(&dptr[SDPCM_FRAMETAG_LEN]);

			brcmf_dbg(GLOM, "Get subframe %d, %p(%p/%d), sublen %d chan %d seq %d\n",
				  num, pfirst, pfirst->data,
				  pfirst->len, sublen, chan, seq);

			/* precondition: chan == SDPCM_DATA_CHANNEL ||
					 chan == SDPCM_EVENT_CHANNEL */

			if (rxseq != seq) {
				brcmf_dbg(GLOM, "rx_seq %d, expected %d\n",
					  seq, rxseq);
				bus->rx_badseq++;
				rxseq = seq;
			}
1423
1424
			rxseq++;

1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
#ifdef BCMDBG
			if (BRCMF_BYTES_ON() && BRCMF_DATA_ON()) {
				printk(KERN_DEBUG "Rx Subframe Data:\n");
				print_hex_dump_bytes("", DUMP_PREFIX_OFFSET,
						     dptr, dlen);
			}
#endif

			__skb_trim(pfirst, sublen);
			skb_pull(pfirst, doff);

			if (pfirst->len == 0) {
1437
				skb_unlink(pfirst, &bus->glom);
1438
1439
1440
1441
1442
1443
				brcmu_pkt_buf_free_skb(pfirst);
				continue;
			} else if (brcmf_proto_hdrpull(bus->drvr, &ifidx,
						       pfirst) != 0) {
				brcmf_dbg(ERROR, "rx protocol error\n");
				bus->drvr->rx_errors++;
1444
				skb_unlink(pfirst, &bus->glom);
1445
1446
1447
1448
1449
1450
1451
				brcmu_pkt_buf_free_skb(pfirst);
				continue;
			}

#ifdef BCMDBG
			if (BRCMF_GLOM_ON()) {
				brcmf_dbg(GLOM, "subframe %d to stack, %p (%p/%d) nxt/lnk %p/%p\n",
1452
					  bus->glom.qlen, pfirst, pfirst->data,
1453
1454
1455
1456
1457
1458
1459
1460
					  pfirst->len, pfirst->next,
					  pfirst->prev);
				print_hex_dump_bytes("", DUMP_PREFIX_OFFSET,
						pfirst->data,
						min_t(int, pfirst->len, 32));
			}
#endif				/* BCMDBG */
		}
1461
1462
		/* sent any remaining packets up */
		if (bus->glom.qlen) {
1463
			up(&bus->sdsem);
1464
			brcmf_rx_frame(bus->drvr, ifidx, &bus->glom);
1465
1466
1467
1468
			down(&bus->sdsem);
		}

		bus->rxglomframes++;
1469
		bus->rxglompkts += bus->glom.qlen;
1470
1471
1472
1473
	}
	return num;
}

1474
static int brcmf_sdbrcm_dcmd_resp_wait(struct brcmf_sdio *bus, uint *condition,
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
					bool *pending)
{
	DECLARE_WAITQUEUE(wait, current);
	int timeout = msecs_to_jiffies(DCMD_RESP_TIMEOUT);

	/* Wait until control frame is available */
	add_wait_queue(&bus->dcmd_resp_wait, &wait);
	set_current_state(TASK_INTERRUPTIBLE);

	while (!(*condition) && (!signal_pending(current) && timeout))
		timeout = schedule_timeout(timeout);

	if (signal_pending(current))
		*pending = true;

	set_current_state(TASK_RUNNING);
	remove_wait_queue(&bus->dcmd_resp_wait, &wait);

	return timeout;
}

1496
static int brcmf_sdbrcm_dcmd_resp_wake(struct brcmf_sdio *bus)
1497
1498
1499
1500
1501
1502
1503
{
	if (waitqueue_active(&bus->dcmd_resp_wait))
		wake_up_interruptible(&bus->dcmd_resp_wait);

	return 0;
}
static void
1504
brcmf_sdbrcm_read_control(struct brcmf_sdio *bus, u8 *hdr, uint len, uint doff)
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
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1549
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1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
{
	uint rdlen, pad;

	int sdret;

	brcmf_dbg(TRACE, "Enter\n");

	/* Set rxctl for frame (w/optional alignment) */
	bus->rxctl = bus->rxbuf;
	bus->rxctl += BRCMF_FIRSTREAD;
	pad = ((unsigned long)bus->rxctl % BRCMF_SDALIGN);
	if (pad)
		bus->rxctl += (BRCMF_SDALIGN - pad);
	bus->rxctl -= BRCMF_FIRSTREAD;

	/* Copy the already-read portion over */
	memcpy(bus->rxctl, hdr, BRCMF_FIRSTREAD);
	if (len <= BRCMF_FIRSTREAD)
		goto gotpkt;

	/* Raise rdlen to next SDIO block to avoid tail command */
	rdlen = len - BRCMF_FIRSTREAD;
	if (bus->roundup && bus->blocksize && (rdlen > bus->blocksize)) {
		pad = bus->blocksize - (rdlen % bus->blocksize);
		if ((pad <= bus->roundup) && (pad < bus->blocksize) &&
		    ((len + pad) < bus->drvr->maxctl))
			rdlen += pad;
	} else if (rdlen % BRCMF_SDALIGN) {
		rdlen += BRCMF_SDALIGN - (rdlen % BRCMF_SDALIGN);
	}

	/* Satisfy length-alignment requirements */
	if (rdlen & (ALIGNMENT - 1))
		rdlen = roundup(rdlen, ALIGNMENT);

	/* Drop if the read is too big or it exceeds our maximum */
	if ((rdlen + BRCMF_FIRSTREAD) > bus->drvr->maxctl) {
		brcmf_dbg(ERROR, "%d-byte control read exceeds %d-byte buffer\n",
			  rdlen, bus->drvr->maxctl);
		bus->drvr->rx_errors++;
		brcmf_sdbrcm_rxfail(bus, false, false);
		goto done;
	}

	if ((len - doff) > bus->drvr->maxctl) {
		brcmf_dbg(ERROR, "%d-byte ctl frame (%d-byte ctl data) exceeds %d-byte limit\n",
			  len, len - doff, bus->drvr->maxctl);
		bus->drvr->rx_errors++;
		bus->rx_toolong++;
		brcmf_sdbrcm_rxfail(bus, false, false);
		goto done;
	}

	/* Read remainder of frame body into the rxctl buffer */
	sdret = brcmf_sdcard_recv_buf(bus->sdiodev,
				bus->sdiodev->sbwad,
				SDIO_FUNC_2,
1562
				F2SYNC, (bus->rxctl + BRCMF_FIRSTREAD), rdlen);
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	bus->f2rxdata++;

	/* Control frame failures need retransmission */
	if (sdret < 0) {
		brcmf_dbg(ERROR, "read %d control bytes failed: %d\n",
			  rdlen, sdret);
		bus->rxc_errors++;
		brcmf_sdbrcm_rxfail(bus, true, true);
		goto done;
	}

gotpkt:

#ifdef BCMDBG
	if (BRCMF_BYTES_ON() && BRCMF_CTL_ON()) {
		printk(KERN_DEBUG "RxCtrl:\n");
		print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, bus->rxctl, len);
	}
#endif

	/* Point to valid data and indicate its length */
	bus->rxctl += doff;
	bus->rxlen = len - doff;

done:
	/* Awake any waiters */
	brcmf_sdbrcm_dcmd_resp_wake(bus);
}

/* Pad read to blocksize for efficiency */
1593
static void brcmf_pad(struct brcmf_sdio *bus, u16 *pad, u16 *rdlen)
1594
1595
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1597
1598
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1601
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1603
1604
1605
{
	if (bus->roundup && bus->blocksize && *rdlen > bus->blocksize) {
		*pad = bus->blocksize - (*rdlen % bus->blocksize);
		if (*pad <= bus->roundup && *pad < bus->blocksize &&
		    *rdlen + *pad + BRCMF_FIRSTREAD < MAX_RX_DATASZ)
			*rdlen += *pad;
	} else if (*rdlen % BRCMF_SDALIGN) {
		*rdlen += BRCMF_SDALIGN - (*rdlen % BRCMF_SDALIGN);
	}
}

static void
1606
brcmf_alloc_pkt_and_read(struct brcmf_sdio *bus, u16 rdlen,
1607
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1617
			 struct sk_buff **pkt, u8 **rxbuf)
{
	int sdret;		/* Return code from calls */

	*pkt = brcmu_pkt_buf_get_skb(rdlen + BRCMF_SDALIGN);
	if (*pkt == NULL)
		return;

	pkt_align(*pkt, rdlen, BRCMF_SDALIGN);
	*rxbuf = (u8 *) ((*pkt)->data);
	/* Read the entire frame */
1618
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	sdret = brcmf_sdcard_recv_pkt(bus->sdiodev, bus->sdiodev->sbwad,
				      SDIO_FUNC_2, F2SYNC, *pkt);
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	bus->f2rxdata++;

	if (sdret < 0) {
		brcmf_dbg(ERROR, "(nextlen): read %d bytes failed: %d\n",
			  rdlen, sdret);
		brcmu_pkt_buf_free_skb(*pkt);
		bus->drvr->rx_errors++;
		/* Force retry w/normal header read.
		 * Don't attempt NAK for
		 * gSPI
		 */
		brcmf_sdbrcm_rxfail(bus, true, true);
		*pkt = NULL;
	}
}

/* Checks the header */
static int
1638
brcmf_check_rxbuf(struct brcmf_sdio *bus, struct sk_buff *pkt, u8 *rxbuf,
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		  u8 rxseq, u16 nextlen, u16 *len)
{
	u16 check;
	bool len_consistent;	/* Result of comparing readahead len and
				   len from hw-hdr */

	memcpy(bus->rxhdr, rxbuf, SDPCM_HDRLEN);

	/* Extract hardware header fields */
	*len = get_unaligned_le16(bus->rxhdr);
	check = get_unaligned_le16(bus->rxhdr + sizeof(u16));

	/* All zeros means readahead info was bad */
	if (!(*len | check)) {
		brcmf_dbg(INFO, "(nextlen): read zeros in HW header???\n");
		goto fail;
	}

	/* Validate check bytes */
	if ((u16)~(*len ^ check)) {
		brcmf_dbg(ERROR, "(nextlen): HW hdr error: nextlen/len/check 0x%04x/0x%04x/0x%04x\n",
			  nextlen, *len, check);
		bus->rx_badhdr++;
		brcmf_sdbrcm_rxfail(bus, false, false);
		goto fail;
	}

	/* Validate frame length */
	if (*len < SDPCM_HDRLEN) {
		brcmf_dbg(ERROR, "(nextlen): HW hdr length invalid: %d\n",
			  *len);
		goto fail;
	}

	/* Check for consistency with readahead info */
	len_consistent = (nextlen != (roundup(*len, 16) >> 4));
	if (len_consistent) {
		/* Mismatch, force retry w/normal
			header (may be >4K) */
		brcmf_dbg(ERROR, "(nextlen): mismatch, nextlen %d len %d rnd %d; expected rxseq %d\n",
			  nextlen, *len, roundup(*len, 16),
			  rxseq);
		brcmf_sdbrcm_rxfail(bus, true, true);
		goto fail;
	}

	return 0;

fail:
	brcmf_sdbrcm_pktfree2(bus, pkt);
	return -EINVAL;
}

/* Return true if there may be more frames to read */
static uint
1694
brcmf_sdbrcm_readframes(struct brcmf_sdio *bus, uint maxframes, bool *finished)
1695
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{
	u16 len, check;	/* Extracted hardware header fields */
	u8 chan, seq, doff;	/* Extracted software header fields */
	u8 fcbits;		/* Extracted fcbits from software header */

	struct sk_buff *pkt;		/* Packet for event or data frames */
	u16 pad;		/* Number of pad bytes to read */
	u16 rdlen;		/* Total number of bytes to read */
	u8 rxseq;		/* Next sequence number to expect */
	uint rxleft = 0;	/* Remaining number of frames allowed */
	int sdret;		/* Return code from calls */
	u8 txmax;		/* Maximum tx sequence offered */
	u8 *rxbuf;
	int ifidx = 0;
	uint rxcount = 0;	/* Total frames read */

	brcmf_dbg(TRACE, "Enter\n");

	/* Not finished unless we encounter no more frames indication */
	*finished = false;

	for (rxseq = bus->rx_seq, rxleft = maxframes;
1717
1718
	     !bus->rxskip && rxleft &&
	     bus->drvr->bus_if->state != BRCMF_BUS_DOWN;
1719
1720
1721
	     rxseq++, rxleft--) {

		/* Handle glomming separately */
1722
		if (bus->glomd || !skb_queue_empty(&bus->glom)) {
1723
1724
			u8 cnt;
			brcmf_dbg(GLOM, "calling rxglom: glomd %p, glom %p\n",
1725
				  bus->glomd, skb_peek(&bus->glom));
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			cnt = brcmf_sdbrcm_rxglom(bus, rxseq);
			brcmf_dbg(GLOM, "rxglom returned %d\n", cnt);
			rxseq += cnt - 1;
			rxleft = (rxleft > cnt) ? (rxleft - cnt) : 1;
			continue;
		}

		/* Try doing single read if we can */
		if (bus->nextlen) {
			u16 nextlen = bus->nextlen;
			bus->nextlen = 0;

			rdlen = len = nextlen << 4;
			brcmf_pad(bus, &pad, &rdlen);

			/*
			 * After the frame is received we have to
			 * distinguish whether it is data
			 * or non-data frame.
			 */
			brcmf_alloc_pkt_and_read(bus, rdlen, &pkt, &rxbuf);
			if (pkt == NULL) {
				/* Give up on data, request rtx of events */
				brcmf_dbg(ERROR, "(nextlen): brcmf_alloc_pkt_and_read failed: len %d rdlen %d expected rxseq %d\n",
					  len, rdlen, rxseq);
				continue;
			}

			if (brcmf_check_rxbuf(bus, pkt, rxbuf, rxseq, nextlen,
					      &len) < 0)
				continue;

			/* Extract software header fields */
			chan = SDPCM_PACKET_CHANNEL(
					&bus->rxhdr[SDPCM_FRAMETAG_LEN]);
			seq = SDPCM_PACKET_SEQUENCE(
					&bus->rxhdr[SDPCM_FRAMETAG_LEN]);
			doff = SDPCM_DOFFSET_VALUE(
					&bus->rxhdr[SDPCM_FRAMETAG_LEN]);
			txmax = SDPCM_WINDOW_VALUE(
					&bus->rxhdr[SDPCM_FRAMETAG_LEN]);

			bus->nextlen =
			    bus->rxhdr[SDPCM_FRAMETAG_LEN +
				       SDPCM_NEXTLEN_OFFSET];
			if ((bus->nextlen << 4) > MAX_RX_DATASZ) {
				brcmf_dbg(INFO, "(nextlen): got frame w/nextlen too large (%d), seq %d\n",
					  bus->nextlen, seq);
				bus->nextlen = 0;
			}

			bus->drvr->rx_readahead_cnt++;

			/* Handle Flow Control */
			fcbits = SDPCM_FCMASK_VALUE(
					&bus->rxhdr[SDPCM_FRAMETAG_LEN]);

			if (bus->flowcontrol != fcbits) {
				if (~bus->flowcontrol & fcbits)
					bus->fc_xoff++;

				if (bus->flowcontrol & ~fcbits)
					bus->fc_xon++;

				bus->fc_rcvd++;
				bus->flowcontrol = fcbits;
			}

			/* Check and update sequence number */
			if (rxseq != seq) {
				brcmf_dbg(INFO, "(nextlen): rx_seq %d, expected %d\n",
					  seq, rxseq);
				bus->rx_badseq++;
				rxseq = seq;
			}

			/* Check window for sanity */
			if ((u8) (txmax - bus->tx_seq) > 0x40) {
				brcmf_dbg(ERROR, "got unlikely tx max %d with tx_seq %d\n",
					  txmax, bus->tx_seq);
				txmax = bus->tx_seq + 2;
			}
			bus->tx_max = txmax;

#ifdef BCMDBG
			if (BRCMF_BYTES_ON() && BRCMF_DATA_ON()) {
				printk(KERN_DEBUG "Rx Data:\n");
				print_hex_dump_bytes("", DUMP_PREFIX_OFFSET,
						     rxbuf, len);
			} else if (BRCMF_HDRS_ON()) {
				printk(KERN_DEBUG "RxHdr:\n");
				print_hex_dump_bytes("", DUMP_PREFIX_OFFSET,
						     bus->rxhdr, SDPCM_HDRLEN);
			}
#endif

			if (chan == SDPCM_CONTROL_CHANNEL) {
				brcmf_dbg(ERROR, "(nextlen): readahead on control packet %d?\n",
					  seq);
				/* Force retry w/normal header read */
				bus->nextlen = 0;
				brcmf_sdbrcm_rxfail(bus, false, true);
				brcmf_sdbrcm_pktfree2(bus, pkt);
				continue;
			}

			/* Validate data offset */
			if ((doff < SDPCM_HDRLEN) || (doff > len)) {
				brcmf_dbg(ERROR, "(nextlen): bad data offset %d: HW len %d min %d\n",
					  doff, len, SDPCM_HDRLEN);
				brcmf_sdbrcm_rxfail(bus, false, false);
				brcmf_sdbrcm_pktfree2(bus, pkt);
				continue;
			}

			/* All done with this one -- now deliver the packet */
			goto deliver;
		}

		/* Read frame header (hardware and software) */
		sdret = brcmf_sdcard_recv_buf(bus->sdiodev, bus->sdiodev->sbwad,
					      SDIO_FUNC_2, F2SYNC, bus->rxhdr,
1848
					      BRCMF_FIRSTREAD);
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		bus->f2rxhdrs++;

		if (sdret < 0) {
			brcmf_dbg(ERROR, "RXHEADER FAILED: %d\n", sdret);
			bus->rx_hdrfail++;
			brcmf_sdbrcm_rxfail(bus, true, true);
			continue;
		}
#ifdef BCMDBG
		if (BRCMF_BYTES_ON() || BRCMF_HDRS_ON()) {
			printk(KERN_DEBUG "RxHdr:\n");
			print_hex_dump_bytes("", DUMP_PREFIX_OFFSET,
					     bus->rxhdr, SDPCM_HDRLEN);
		}
#endif

		/* Extract hardware header fields */
		len = get_unaligned_le16(bus->rxhdr);
		check = get_unaligned_le16(bus->rxhdr + sizeof(u16));

		/* All zeros means no more frames */
		if (!(len | check)) {
			*finished = true;
			break;
		}

		/* Validate check bytes */
		if ((u16) ~(len ^ check)) {
			brcmf_dbg(ERROR, "HW hdr err: len/check 0x%04x/0x%04x\n",
				  len, check);
			bus->rx_badhdr++;
			brcmf_sdbrcm_rxfail(bus, false, false);
			continue;
		}

		/* Validate frame length */
		if (len < SDPCM_HDRLEN) {
			brcmf_dbg(ERROR, "HW hdr length invalid: %d\n", len);
			continue;
		}

		/* Extract software header fields */
		chan = SDPCM_PACKET_CHANNEL(&bus->rxhdr[SDPCM_FRAMETAG_LEN]);
		seq = SDPCM_PACKET_SEQUENCE(&bus->rxhdr[SDPCM_FRAMETAG_LEN]);
		doff = SDPCM_DOFFSET_VALUE(&bus->rxhdr[SDPCM_FRAMETAG_LEN]);
		txmax = SDPCM_WINDOW_VALUE(&bus->rxhdr[SDPCM_FRAMETAG_LEN]);

		/* Validate data offset */
		if ((doff < SDPCM_HDRLEN) || (doff > len)) {
			brcmf_dbg(ERROR, "Bad data offset %d: HW len %d, min %d seq %d\n",
				  doff, len, SDPCM_HDRLEN, seq);
			bus->rx_badhdr++;
			brcmf_sdbrcm_rxfail(bus, false, false);
			continue;
		}

		/* Save the readahead length if there is one */
		bus->nextlen =
		    bus->rxhdr[SDPCM_FRAMETAG_LEN + SDPCM_NEXTLEN_OFFSET];
		if ((bus->nextlen << 4) > MAX_RX_DATASZ) {
			brcmf_dbg(INFO, "(nextlen): got frame w/nextlen too large (%d), seq %d\n",
				  bus->nextlen, seq);
			bus->nextlen = 0;
		}

		/* Handle Flow Control */
		fcbits = SDPCM_FCMASK_VALUE(&bus->rxhdr[SDPCM_FRAMETAG_LEN]);

		if (bus->flowcontrol != fcbits) {
			if (~bus->flowcontrol & fcbits)
				bus->fc_xoff++;

			if (bus->flowcontrol & ~fcbits)
				bus->fc_xon++;

			bus->fc_rcvd++;
			bus->flowcontrol = fcbits;
		}

		/* Check and update sequence number */
		if (rxseq != seq) {
			brcmf_dbg(INFO, "rx_seq %d, expected %d\n", seq, rxseq);
			bus->rx_badseq++;
			rxseq = seq;
		}

		/* Check window for sanity */
		if ((u8) (txmax - bus->tx_seq) > 0x40) {
			brcmf_dbg(ERROR, "unlikely tx max %d with tx_seq %d\n",
				  txmax, bus->tx_seq);
			txmax = bus->tx_seq + 2;
		}
		bus->tx_max = txmax;

		/* Call a separate function for control frames */
		if (chan == SDPCM_CONTROL_CHANNEL) {
			brcmf_sdbrcm_read_control(bus, bus->rxhdr, len, doff);
			continue;
		}

		/* precondition: chan is either SDPCM_DATA_CHANNEL,
		   SDPCM_EVENT_CHANNEL, SDPCM_TEST_CHANNEL or
		   SDPCM_GLOM_CHANNEL */

		/* Length to read */
		rdlen = (len > BRCMF_FIRSTREAD) ? (len - BRCMF_FIRSTREAD) : 0;

		/* May pad read to blocksize for efficiency */
		if (bus->roundup && bus->blocksize &&
			(rdlen > bus->blocksize)) {
			pad = bus->blocksize - (rdlen % bus->blocksize);
			if ((pad <= bus->roundup) && (pad < bus->blocksize) &&
			    ((rdlen + pad + BRCMF_FIRSTREAD) < MAX_RX_DATASZ))
				rdlen += pad;
		} else if (rdlen % BRCMF_SDALIGN) {
			rdlen += BRCMF_SDALIGN - (rdlen % BRCMF_SDALIGN);
		}

		/* Satisfy length-alignment requirements */
		if (rdlen & (ALIGNMENT - 1))
			rdlen = roundup(rdlen, ALIGNMENT);

		if ((rdlen + BRCMF_FIRSTREAD) > MAX_RX_DATASZ) {
			/* Too long -- skip this frame */
			brcmf_dbg(ERROR, "too long: len %d rdlen %d\n",
				  len, rdlen);
			bus->drvr->rx_errors++;
			bus->rx_toolong++;
			brcmf_sdbrcm_rxfail(bus, false, false);
			continue;
		}

		pkt = brcmu_pkt_buf_get_skb(rdlen +
					    BRCMF_FIRSTREAD + BRCMF_SDALIGN);
		if (!pkt) {
			/* Give up on data, request rtx of events */
			brcmf_dbg(ERROR, "brcmu_pkt_buf_get_skb failed: rdlen %d chan %d\n",
				  rdlen, chan);
			bus->drvr->rx_dropped++;
			brcmf_sdbrcm_rxfail(bus, false, RETRYCHAN(chan));
			continue;
		}

		/* Leave room for what we already read, and align remainder */
		skb_pull(pkt, BRCMF_FIRSTREAD);
		pkt_align(pkt, rdlen, BRCMF_SDALIGN);

		/* Read the remaining frame data */
1997
1998
		sdret = brcmf_sdcard_recv_pkt(bus->sdiodev, bus->sdiodev->sbwad,
					      SDIO_FUNC_2, F2SYNC, pkt);
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		bus->f2rxdata++;

		if (sdret < 0) {
			brcmf_dbg(ERROR, "read %d %s bytes failed: %d\n", rdlen,
				  ((chan == SDPCM_EVENT_CHANNEL) ? "event"
				   : ((chan == SDPCM_DATA_CHANNEL) ? "data"
				      : "test")), sdret);
			brcmu_pkt_buf_free_skb(pkt);
			bus->drvr->rx_errors++;
			brcmf_sdbrcm_rxfail(bus, true, RETRYCHAN(chan));
			continue;
		}

		/* Copy the already-read portion */
		skb_push(pkt, BRCMF_FIRSTREAD);
		memcpy(pkt->data, bus->rxhdr, BRCMF_FIRSTREAD);

#ifdef BCMDBG
		if (BRCMF_BYTES_ON() && BRCMF_DATA_ON()) {
			printk(KERN_DEBUG "Rx Data:\n");
			print_hex_dump_bytes("", DUMP_PREFIX_OFFSET,
					     pkt->data, len);
		}
#endif

deliver:
		/* Save superframe descriptor and allocate packet frame */
		if (chan == SDPCM_GLOM_CHANNEL) {
			if (SDPCM_GLOMDESC(&bus->rxhdr[SDPCM_FRAMETAG_LEN])) {
				brcmf_dbg(GLOM, "glom descriptor, %d bytes:\n",
					  len);
#ifdef BCMDBG
				if (BRCMF_GLOM_ON()) {
					printk(KERN_DEBUG "Glom Data:\n");
					print_hex_dump_bytes("",
							     DUMP_PREFIX_OFFSET,
							     pkt->data, len);
				}
#endif
				__skb_trim(pkt, len);
				skb_pull(pkt, SDPCM_HDRLEN);
				bus->glomd = pkt;
			} else {
				brcmf_dbg(ERROR, "%s: glom superframe w/o "
					  "descriptor!\n", __func__);
				brcmf_sdbrcm_rxfail(bus, false, false);
			}
			continue;
		}

		/* Fill in packet len and prio, deliver upward */
		__skb_trim(pkt, len);
		skb_pull(pkt, doff);

		if (pkt->len == 0) {
			brcmu_pkt_buf_free_skb(pkt);
			continue;
		} else if (brcmf_proto_hdrpull(bus->drvr, &ifidx, pkt) != 0) {
			brcmf_dbg(ERROR, "rx protocol error\n");
			brcmu_pkt_buf_free_skb(pkt);
			bus->drvr->rx_errors++;
			continue;
		}

		/* Unlock during rx call */
		up(&bus->sdsem);
2065
		brcmf_rx_packet(bus->drvr, ifidx, pkt);
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		down(&bus->sdsem);
	}
	rxcount = maxframes - rxleft;
#ifdef BCMDBG
	/* Message if we hit the limit */
	if (!rxleft)
		brcmf_dbg(DATA, "hit rx limit of %d frames\n",
			  maxframes);
	else
#endif				/* BCMDBG */
		brcmf_dbg(DATA, "processed %d frames\n", rxcount);
	/* Back off rxseq if awaiting rtx, update rx_seq */
	if (bus->rxskip)
		rxseq--;
	bus->rx_seq = rxseq;

	return rxcount;
}

static void
2086
brcmf_sdbrcm_wait_for_event(struct brcmf_sdio *bus, bool *lockvar)
2087
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{
	up(&bus->sdsem);
	wait_event_interruptible_timeout(bus->ctrl_wait,
					 (*lockvar == false), HZ * 2);
	down(&bus->sdsem);
	return;
}

static void
2096
brcmf_sdbrcm_wait_event_wakeup(struct brcmf_sdio *bus)
2097
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{
	if (waitqueue_active(&bus->ctrl_wait))
		wake_up_interruptible(&bus->ctrl_wait);
	return;
}

/* Writes a HW/SW header into the packet and sends it. */
/* Assumes: (a) header space already there, (b) caller holds lock */
2105
static int brcmf_sdbrcm_txpkt(struct brcmf_sdio *bus, struct sk_buff *pkt,
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			      uint chan, bool free_pkt)
{
	int ret;
	u8 *frame;
	u16 len, pad = 0;
	u32 swheader;
	struct sk_buff *new;
	int i;

	brcmf_dbg(TRACE, "Enter\n");

	frame = (u8 *) (pkt->data);

	/* Add alignment padding, allocate new packet if needed */
	pad = ((unsigned long)frame % BRCMF_SDALIGN);
	if (pad) {
		if (skb_headroom(pkt) < pad) {
			brcmf_dbg(INFO, "insufficient headroom %d for %d pad\n",
				  skb_headroom(pkt), pad);
			bus->drvr->tx_realloc++;
			new = brcmu_pkt_buf_get_skb(pkt->len + BRCMF_SDALIGN);
			if (!new) {
				brcmf_dbg(ERROR, "couldn't allocate new %d-byte packet\n",
					  pkt->len + BRCMF_SDALIGN);
				ret = -ENOMEM;
				goto done;
			}

			pkt_align(new, pkt->len, BRCMF_SDALIGN);
			memcpy(new->data, pkt->data, pkt->len);
			if (free_pkt)
				brcmu_pkt_buf_free_skb(pkt);
			/* free the pkt if canned one is not used */
			free_pkt = true;
			pkt = new;
			frame = (u8 *) (pkt->data);
			/* precondition: (frame % BRCMF_SDALIGN) == 0) */
			pad = 0;
		} else {
			skb_push(pkt, pad);
			frame = (u8 *) (pkt->data);
			/* precondition: pad + SDPCM_HDRLEN <= pkt->len */
			memset(frame, 0, pad + SDPCM_HDRLEN);
		}
	}
	/* precondition: pad < BRCMF_SDALIGN */

	/* Hardware tag: 2 byte len followed by 2 byte ~len check (all LE) */
	len = (u16) (pkt->len);
	*(__le16 *) frame = cpu_to_le16(len);
	*(((__le16 *) frame) + 1) = cpu_to_le16(~len);

	/* Software tag: channel, sequence number, data offset */
	swheader =
	    ((chan << SDPCM_CHANNEL_SHIFT) & SDPCM_CHANNEL_MASK) | bus->tx_seq |
	    (((pad +
	       SDPCM_HDRLEN) << SDPCM_DOFFSET_SHIFT) & SDPCM_DOFFSET_MASK);

	put_unaligned_le32(swheader, frame + SDPCM_FRAMETAG_LEN);
	put_unaligned_le32(0, frame + SDPCM_FRAMETAG_LEN + sizeof(swheader));

#ifdef BCMDBG
	tx_packets[pkt->priority]++;
	if (BRCMF_BYTES_ON() &&
	    (((BRCMF_CTL_ON() && (chan == SDPCM_CONTROL_CHANNEL)) ||
	      (BRCMF_DATA_ON() && (chan != SDPCM_CONTROL_CHANNEL))))) {
		printk(KERN_DEBUG "Tx Frame:\n");
		print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, frame, len);
	} else if (BRCMF_HDRS_ON()) {
		printk(KERN_DEBUG "TxHdr:\n");
		print_hex_dump_bytes("", DUMP_PREFIX_OFFSET,
				     frame, min_t(u16, len, 16));
	}
#endif

	/* Raise len to next SDIO block to eliminate tail command */
	if (bus->roundup && bus->blocksize && (len > bus->blocksize)) {
		u16 pad = bus->blocksize - (len % bus->blocksize);
		if ((pad <= bus->roundup) && (pad < bus->blocksize))
				len += pad;
	} else if (len % BRCMF_SDALIGN) {
		len += BRCMF_SDALIGN - (len % BRCMF_SDALIGN);
	}

	/* Some controllers have trouble with odd bytes -- round to even */
	if (len & (ALIGNMENT - 1))
			len = roundup(len, ALIGNMENT);

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2195
	ret = brcmf_sdcard_send_pkt(bus->sdiodev, bus->sdiodev->sbwad,
				    SDIO_FUNC_2, F2SYNC, pkt);
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	bus->f2txdata++;

	if (ret < 0) {
		/* On failure, abort the command and terminate the frame */
		brcmf_dbg(INFO, "sdio error %d, abort command and terminate frame\n",
			  ret);
		bus->tx_sderrs++;

		brcmf_sdcard_abort(bus->sdiodev, SDIO_FUNC_2);
		brcmf_sdcard_cfg_write(bus->sdiodev, SDIO_FUNC_1,
				 SBSDIO_FUNC1_FRAMECTRL, SFC_WF_TERM,
				 NULL);
		bus->f1regdata++;

		for (i = 0; i < 3; i++) {
			u8 hi, lo;
			hi = brcmf_sdcard_cfg_read(bus->sdiodev,
					     SDIO_FUNC_1,
					     SBSDIO_FUNC1_WFRAMEBCHI,
					     NULL);
			lo = brcmf_sdcard_cfg_read(bus->sdiodev,
					     SDIO_FUNC_1,
					     SBSDIO_FUNC1_WFRAMEBCLO,
					     NULL);
			bus->f1regdata += 2;
			if ((hi == 0) && (lo == 0))
				break;
		}

	}
	if (ret == 0)
		bus->tx_seq = (bus->tx_seq + 1) % SDPCM_SEQUENCE_WRAP;

done:
	/* restore pkt buffer pointer before calling tx complete routine */
	skb_pull(pkt, SDPCM_HDRLEN + pad);
	up(&bus->sdsem);
	brcmf_txcomplete(bus->drvr, pkt, ret != 0);
	down(&bus->sdsem);

	if (free_pkt)
		brcmu_pkt_buf_free_skb(pkt);

	return ret;
}

2242
static uint brcmf_sdbrcm_sendfromq(struct brcmf_sdio *bus, uint maxframes)
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