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linux/drivers/net/rrunner.h
David Howells 7d12e780e0 IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.

The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around.  On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).

Where appropriate, an arch may override the generic storage facility and do
something different with the variable.  On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.

Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions.  Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller.  A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.

I've build this code with allyesconfig for x86_64 and i386.  I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.

This will affect all archs.  Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:

	struct pt_regs *old_regs = set_irq_regs(regs);

And put the old one back at the end:

	set_irq_regs(old_regs);

Don't pass regs through to generic_handle_irq() or __do_IRQ().

In timer_interrupt(), this sort of change will be necessary:

	-	update_process_times(user_mode(regs));
	-	profile_tick(CPU_PROFILING, regs);
	+	update_process_times(user_mode(get_irq_regs()));
	+	profile_tick(CPU_PROFILING);

I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().

Some notes on the interrupt handling in the drivers:

 (*) input_dev() is now gone entirely.  The regs pointer is no longer stored in
     the input_dev struct.

 (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking.  It does
     something different depending on whether it's been supplied with a regs
     pointer or not.

 (*) Various IRQ handler function pointers have been moved to type
     irq_handler_t.

Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 15:10:12 +01:00

848 lines
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#ifndef _RRUNNER_H_
#define _RRUNNER_H_
#include <linux/interrupt.h>
#if ((BITS_PER_LONG != 32) && (BITS_PER_LONG != 64))
#error "BITS_PER_LONG not defined or not valid"
#endif
struct rr_regs {
u32 pad0[16];
u32 HostCtrl;
u32 LocalCtrl;
u32 Pc;
u32 BrkPt;
/* Timer increments every 0.97 micro-seconds (unsigned int) */
u32 Timer_Hi;
u32 Timer;
u32 TimerRef;
u32 PciState;
u32 Event;
u32 MbEvent;
u32 WinBase;
u32 WinData;
u32 RX_state;
u32 TX_state;
u32 Overhead;
u32 ExtIo;
u32 DmaWriteHostHi;
u32 DmaWriteHostLo;
u32 pad1[2];
u32 DmaReadHostHi;
u32 DmaReadHostLo;
u32 pad2;
u32 DmaReadLen;
u32 DmaWriteState;
u32 DmaWriteLcl;
u32 DmaWriteIPchecksum;
u32 DmaWriteLen;
u32 DmaReadState;
u32 DmaReadLcl;
u32 DmaReadIPchecksum;
u32 pad3;
u32 RxBase;
u32 RxPrd;
u32 RxCon;
u32 pad4;
u32 TxBase;
u32 TxPrd;
u32 TxCon;
u32 pad5;
u32 RxIndPro;
u32 RxIndCon;
u32 RxIndRef;
u32 pad6;
u32 TxIndPro;
u32 TxIndCon;
u32 TxIndRef;
u32 pad7[17];
u32 DrCmndPro;
u32 DrCmndCon;
u32 DrCmndRef;
u32 pad8;
u32 DwCmndPro;
u32 DwCmndCon;
u32 DwCmndRef;
u32 AssistState;
u32 DrDataPro;
u32 DrDataCon;
u32 DrDataRef;
u32 pad9;
u32 DwDataPro;
u32 DwDataCon;
u32 DwDataRef;
u32 pad10[33];
u32 EvtCon;
u32 pad11[5];
u32 TxPi;
u32 IpRxPi;
u32 pad11a[8];
u32 CmdRing[16];
/* The ULA is in two registers the high order two bytes of the first
* word contain the RunCode features.
* ula0 res res byte0 byte1
* ula1 byte2 byte3 byte4 byte5
*/
u32 Ula0;
u32 Ula1;
u32 RxRingHi;
u32 RxRingLo;
u32 InfoPtrHi;
u32 InfoPtrLo;
u32 Mode;
u32 ConRetry;
u32 ConRetryTmr;
u32 ConTmout;
u32 CtatTmr;
u32 MaxRxRng;
u32 IntrTmr;
u32 TxDataMvTimeout;
u32 RxDataMvTimeout;
u32 EvtPrd;
u32 TraceIdx;
u32 Fail1;
u32 Fail2;
u32 DrvPrm;
u32 FilterLA;
u32 FwRev;
u32 FwRes1;
u32 FwRes2;
u32 FwRes3;
u32 WriteDmaThresh;
u32 ReadDmaThresh;
u32 pad12[325];
u32 Window[512];
};
/*
* Host control register bits.
*/
#define RR_INT 0x01
#define RR_CLEAR_INT 0x02
#define NO_SWAP 0x04000004
#define NO_SWAP1 0x00000004
#define PCI_RESET_NIC 0x08
#define HALT_NIC 0x10
#define SSTEP_NIC 0x20
#define MEM_READ_MULTI 0x40
#define NIC_HALTED 0x100
#define HALT_INST 0x200
#define PARITY_ERR 0x400
#define INVALID_INST_B 0x800
#define RR_REV_2 0x20000000
#define RR_REV_MASK 0xf0000000
/*
* Local control register bits.
*/
#define INTA_STATE 0x01
#define CLEAR_INTA 0x02
#define FAST_EEPROM_ACCESS 0x08
#define ENABLE_EXTRA_SRAM 0x100
#define ENABLE_EXTRA_DESC 0x200
#define ENABLE_PARITY 0x400
#define FORCE_DMA_PARITY_ERROR 0x800
#define ENABLE_EEPROM_WRITE 0x1000
#define ENABLE_DATA_CACHE 0x2000
#define SRAM_LO_PARITY_ERR 0x4000
#define SRAM_HI_PARITY_ERR 0x8000
/*
* PCI state bits.
*/
#define FORCE_PCI_RESET 0x01
#define PROVIDE_LENGTH 0x02
#define MASK_DMA_READ_MAX 0x1C
#define RBURST_DISABLE 0x00
#define RBURST_4 0x04
#define RBURST_16 0x08
#define RBURST_32 0x0C
#define RBURST_64 0x10
#define RBURST_128 0x14
#define RBURST_256 0x18
#define RBURST_1024 0x1C
#define MASK_DMA_WRITE_MAX 0xE0
#define WBURST_DISABLE 0x00
#define WBURST_4 0x20
#define WBURST_16 0x40
#define WBURST_32 0x60
#define WBURST_64 0x80
#define WBURST_128 0xa0
#define WBURST_256 0xc0
#define WBURST_1024 0xe0
#define MASK_MIN_DMA 0xFF00
#define FIFO_RETRY_ENABLE 0x10000
/*
* Event register
*/
#define DMA_WRITE_DONE 0x10000
#define DMA_READ_DONE 0x20000
#define DMA_WRITE_ERR 0x40000
#define DMA_READ_ERR 0x80000
/*
* Receive state
*
* RoadRunner HIPPI Receive State Register controls and monitors the
* HIPPI receive interface in the NIC. Look at err bits when a HIPPI
* receive Error Event occurs.
*/
#define ENABLE_NEW_CON 0x01
#define RESET_RECV 0x02
#define RECV_ALL 0x00
#define RECV_1K 0x20
#define RECV_2K 0x40
#define RECV_4K 0x60
#define RECV_8K 0x80
#define RECV_16K 0xa0
#define RECV_32K 0xc0
#define RECV_64K 0xe0
/*
* Transmit status.
*/
#define ENA_XMIT 0x01
#define PERM_CON 0x02
/*
* DMA write state
*/
#define RESET_DMA 0x01
#define NO_SWAP_DMA 0x02
#define DMA_ACTIVE 0x04
#define THRESH_MASK 0x1F
#define DMA_ERROR_MASK 0xff000000
/*
* Gooddies stored in the ULA registers.
*/
#define TRACE_ON_WHAT_BIT 0x00020000 /* Traces on */
#define ONEM_BUF_WHAT_BIT 0x00040000 /* 1Meg vs 256K */
#define CHAR_API_WHAT_BIT 0x00080000 /* Char API vs network only */
#define CMD_EVT_WHAT_BIT 0x00200000 /* Command event */
#define LONG_TX_WHAT_BIT 0x00400000
#define LONG_RX_WHAT_BIT 0x00800000
#define WHAT_BIT_MASK 0xFFFD0000 /* Feature bit mask */
/*
* Mode status
*/
#define EVENT_OVFL 0x80000000
#define FATAL_ERR 0x40000000
#define LOOP_BACK 0x01
#define MODE_PH 0x02
#define MODE_FP 0x00
#define PTR64BIT 0x04
#define PTR32BIT 0x00
#define PTR_WD_SWAP 0x08
#define PTR_WD_NOSWAP 0x00
#define POST_WARN_EVENT 0x10
#define ERR_TERM 0x20
#define DIRECT_CONN 0x40
#define NO_NIC_WATCHDOG 0x80
#define SWAP_DATA 0x100
#define SWAP_CONTROL 0x200
#define NIC_HALT_ON_ERR 0x400
#define NIC_NO_RESTART 0x800
#define HALF_DUP_TX 0x1000
#define HALF_DUP_RX 0x2000
/*
* Error codes
*/
/* Host Error Codes - values of fail1 */
#define ERR_UNKNOWN_MBOX 0x1001
#define ERR_UNKNOWN_CMD 0x1002
#define ERR_MAX_RING 0x1003
#define ERR_RING_CLOSED 0x1004
#define ERR_RING_OPEN 0x1005
/* Firmware internal errors */
#define ERR_EVENT_RING_FULL 0x01
#define ERR_DW_PEND_CMND_FULL 0x02
#define ERR_DR_PEND_CMND_FULL 0x03
#define ERR_DW_PEND_DATA_FULL 0x04
#define ERR_DR_PEND_DATA_FULL 0x05
#define ERR_ILLEGAL_JUMP 0x06
#define ERR_UNIMPLEMENTED 0x07
#define ERR_TX_INFO_FULL 0x08
#define ERR_RX_INFO_FULL 0x09
#define ERR_ILLEGAL_MODE 0x0A
#define ERR_MAIN_TIMEOUT 0x0B
#define ERR_EVENT_BITS 0x0C
#define ERR_UNPEND_FULL 0x0D
#define ERR_TIMER_QUEUE_FULL 0x0E
#define ERR_TIMER_QUEUE_EMPTY 0x0F
#define ERR_TIMER_NO_FREE 0x10
#define ERR_INTR_START 0x11
#define ERR_BAD_STARTUP 0x12
#define ERR_NO_PKT_END 0x13
#define ERR_HALTED_ON_ERR 0x14
/* Hardware NIC Errors */
#define ERR_WRITE_DMA 0x0101
#define ERR_READ_DMA 0x0102
#define ERR_EXT_SERIAL 0x0103
#define ERR_TX_INT_PARITY 0x0104
/*
* Event definitions
*/
#define EVT_RING_ENTRIES 64
#define EVT_RING_SIZE (EVT_RING_ENTRIES * sizeof(struct event))
struct event {
#ifdef __LITTLE_ENDIAN
u16 index;
u8 ring;
u8 code;
#else
u8 code;
u8 ring;
u16 index;
#endif
u32 timestamp;
};
/*
* General Events
*/
#define E_NIC_UP 0x01
#define E_WATCHDOG 0x02
#define E_STAT_UPD 0x04
#define E_INVAL_CMD 0x05
#define E_SET_CMD_CONS 0x06
#define E_LINK_ON 0x07
#define E_LINK_OFF 0x08
#define E_INTERN_ERR 0x09
#define E_HOST_ERR 0x0A
#define E_STATS_UPDATE 0x0B
#define E_REJECTING 0x0C
/*
* Send Events
*/
#define E_CON_REJ 0x13
#define E_CON_TMOUT 0x14
#define E_CON_NC_TMOUT 0x15 /* I , Connection No Campon Timeout */
#define E_DISC_ERR 0x16
#define E_INT_PRTY 0x17
#define E_TX_IDLE 0x18
#define E_TX_LINK_DROP 0x19
#define E_TX_INV_RNG 0x1A
#define E_TX_INV_BUF 0x1B
#define E_TX_INV_DSC 0x1C
/*
* Destination Events
*/
/*
* General Receive events
*/
#define E_VAL_RNG 0x20
#define E_RX_RNG_ENER 0x21
#define E_INV_RNG 0x22
#define E_RX_RNG_SPC 0x23
#define E_RX_RNG_OUT 0x24
#define E_PKT_DISCARD 0x25
#define E_INFO_EVT 0x27
/*
* Data corrupted events
*/
#define E_RX_PAR_ERR 0x2B
#define E_RX_LLRC_ERR 0x2C
#define E_IP_CKSM_ERR 0x2D
#define E_DTA_CKSM_ERR 0x2E
#define E_SHT_BST 0x2F
/*
* Data lost events
*/
#define E_LST_LNK_ERR 0x30
#define E_FLG_SYN_ERR 0x31
#define E_FRM_ERR 0x32
#define E_RX_IDLE 0x33
#define E_PKT_LN_ERR 0x34
#define E_STATE_ERR 0x35
#define E_UNEXP_DATA 0x3C
/*
* Fatal events
*/
#define E_RX_INV_BUF 0x36
#define E_RX_INV_DSC 0x37
#define E_RNG_BLK 0x38
/*
* Warning events
*/
#define E_RX_TO 0x39
#define E_BFR_SPC 0x3A
#define E_INV_ULP 0x3B
#define E_NOT_IMPLEMENTED 0x40
/*
* Commands
*/
#define CMD_RING_ENTRIES 16
struct cmd {
#ifdef __LITTLE_ENDIAN
u16 index;
u8 ring;
u8 code;
#else
u8 code;
u8 ring;
u16 index;
#endif
};
#define C_START_FW 0x01
#define C_UPD_STAT 0x02
#define C_WATCHDOG 0x05
#define C_DEL_RNG 0x09
#define C_NEW_RNG 0x0A
#define C_CONN 0x0D
/*
* Mode bits
*/
#define PACKET_BAD 0x01 /* Packet had link-layer error */
#define INTERRUPT 0x02
#define TX_IP_CKSUM 0x04
#define PACKET_END 0x08
#define PACKET_START 0x10
#define SAME_IFIELD 0x80
typedef struct {
#if (BITS_PER_LONG == 64)
u64 addrlo;
#else
u32 addrhi;
u32 addrlo;
#endif
} rraddr;
static inline void set_rraddr(rraddr *ra, dma_addr_t addr)
{
unsigned long baddr = addr;
#if (BITS_PER_LONG == 64)
ra->addrlo = baddr;
#else
/* Don't bother setting zero every time */
ra->addrlo = baddr;
#endif
mb();
}
static inline void set_rxaddr(struct rr_regs __iomem *regs, volatile dma_addr_t addr)
{
unsigned long baddr = addr;
#if (BITS_PER_LONG == 64) && defined(__LITTLE_ENDIAN)
writel(baddr & 0xffffffff, &regs->RxRingHi);
writel(baddr >> 32, &regs->RxRingLo);
#elif (BITS_PER_LONG == 64)
writel(baddr >> 32, &regs->RxRingHi);
writel(baddr & 0xffffffff, &regs->RxRingLo);
#else
writel(0, &regs->RxRingHi);
writel(baddr, &regs->RxRingLo);
#endif
mb();
}
static inline void set_infoaddr(struct rr_regs __iomem *regs, volatile dma_addr_t addr)
{
unsigned long baddr = addr;
#if (BITS_PER_LONG == 64) && defined(__LITTLE_ENDIAN)
writel(baddr & 0xffffffff, &regs->InfoPtrHi);
writel(baddr >> 32, &regs->InfoPtrLo);
#elif (BITS_PER_LONG == 64)
writel(baddr >> 32, &regs->InfoPtrHi);
writel(baddr & 0xffffffff, &regs->InfoPtrLo);
#else
writel(0, &regs->InfoPtrHi);
writel(baddr, &regs->InfoPtrLo);
#endif
mb();
}
/*
* TX ring
*/
#ifdef CONFIG_ROADRUNNER_LARGE_RINGS
#define TX_RING_ENTRIES 32
#else
#define TX_RING_ENTRIES 16
#endif
#define TX_TOTAL_SIZE (TX_RING_ENTRIES * sizeof(struct tx_desc))
struct tx_desc{
rraddr addr;
u32 res;
#ifdef __LITTLE_ENDIAN
u16 size;
u8 pad;
u8 mode;
#else
u8 mode;
u8 pad;
u16 size;
#endif
};
#ifdef CONFIG_ROADRUNNER_LARGE_RINGS
#define RX_RING_ENTRIES 32
#else
#define RX_RING_ENTRIES 16
#endif
#define RX_TOTAL_SIZE (RX_RING_ENTRIES * sizeof(struct rx_desc))
struct rx_desc{
rraddr addr;
u32 res;
#ifdef __LITTLE_ENDIAN
u16 size;
u8 pad;
u8 mode;
#else
u8 mode;
u8 pad;
u16 size;
#endif
};
/*
* ioctl's
*/
#define SIOCRRPFW SIOCDEVPRIVATE /* put firmware */
#define SIOCRRGFW SIOCDEVPRIVATE+1 /* get firmware */
#define SIOCRRID SIOCDEVPRIVATE+2 /* identify */
struct seg_hdr {
u32 seg_start;
u32 seg_len;
u32 seg_eestart;
};
#define EEPROM_BASE 0x80000000
#define EEPROM_WORDS 8192
#define EEPROM_BYTES (EEPROM_WORDS * sizeof(u32))
struct eeprom_boot {
u32 key1;
u32 key2;
u32 sram_size;
struct seg_hdr loader;
u32 init_chksum;
u32 reserved1;
};
struct eeprom_manf {
u32 HeaderFmt;
u32 Firmware;
u32 BoardRevision;
u32 RoadrunnerRev;
char OpticsPart[8];
u32 OpticsRev;
u32 pad1;
char SramPart[8];
u32 SramRev;
u32 pad2;
char EepromPart[8];
u32 EepromRev;
u32 EepromSize;
char PalPart[8];
u32 PalRev;
u32 pad3;
char PalCodeFile[12];
u32 PalCodeRev;
char BoardULA[8];
char SerialNo[8];
char MfgDate[8];
char MfgTime[8];
char ModifyDate[8];
u32 ModCount;
u32 pad4[13];
};
struct eeprom_phase_info {
char phase1File[12];
u32 phase1Rev;
char phase1Date[8];
char phase2File[12];
u32 phase2Rev;
char phase2Date[8];
u32 reserved7[4];
};
struct eeprom_rncd_info {
u32 FwStart;
u32 FwRev;
char FwDate[8];
u32 AddrRunCodeSegs;
u32 FileNames;
char File[13][8];
};
/* Phase 1 region (starts are word offset 0x80) */
struct phase1_hdr{
u32 jump;
u32 noop;
struct seg_hdr phase2Seg;
};
struct eeprom {
struct eeprom_boot boot;
u32 pad1[8];
struct eeprom_manf manf;
struct eeprom_phase_info phase_info;
struct eeprom_rncd_info rncd_info;
u32 pad2[15];
u32 hdr_checksum;
struct phase1_hdr phase1;
};
struct rr_stats {
u32 NicTimeStamp;
u32 RngCreated;
u32 RngDeleted;
u32 IntrGen;
u32 NEvtOvfl;
u32 InvCmd;
u32 DmaReadErrs;
u32 DmaWriteErrs;
u32 StatUpdtT;
u32 StatUpdtC;
u32 WatchDog;
u32 Trace;
/* Serial HIPPI */
u32 LnkRdyEst;
u32 GLinkErr;
u32 AltFlgErr;
u32 OvhdBit8Sync;
u32 RmtSerPrtyErr;
u32 RmtParPrtyErr;
u32 RmtLoopBk;
u32 pad1;
/* HIPPI tx */
u32 ConEst;
u32 ConRejS;
u32 ConRetry;
u32 ConTmOut;
u32 SndConDiscon;
u32 SndParErr;
u32 PktSnt;
u32 pad2[2];
u32 ShFBstSnt;
u64 BytSent;
u32 TxTimeout;
u32 pad3[3];
/* HIPPI rx */
u32 ConAcc;
u32 ConRejdiPrty;
u32 ConRejd64b;
u32 ConRejdBuf;
u32 RxConDiscon;
u32 RxConNoData;
u32 PktRx;
u32 pad4[2];
u32 ShFBstRx;
u64 BytRx;
u32 RxParErr;
u32 RxLLRCerr;
u32 RxBstSZerr;
u32 RxStateErr;
u32 RxRdyErr;
u32 RxInvULP;
u32 RxSpcBuf;
u32 RxSpcDesc;
u32 RxRngSpc;
u32 RxRngFull;
u32 RxPktLenErr;
u32 RxCksmErr;
u32 RxPktDrp;
u32 RngLowSpc;
u32 RngDataClose;
u32 RxTimeout;
u32 RxIdle;
};
/*
* This struct is shared with the NIC firmware.
*/
struct ring_ctrl {
rraddr rngptr;
#ifdef __LITTLE_ENDIAN
u16 entries;
u8 pad;
u8 entry_size;
u16 pi;
u16 mode;
#else
u8 entry_size;
u8 pad;
u16 entries;
u16 mode;
u16 pi;
#endif
};
struct rr_info {
union {
struct rr_stats stats;
u32 stati[128];
} s;
struct ring_ctrl evt_ctrl;
struct ring_ctrl cmd_ctrl;
struct ring_ctrl tx_ctrl;
u8 pad[464];
u8 trace[3072];
};
/*
* The linux structure for the RoadRunner.
*
* RX/TX descriptors are put first to make sure they are properly
* aligned and do not cross cache-line boundaries.
*/
struct rr_private
{
struct rx_desc *rx_ring;
struct tx_desc *tx_ring;
struct event *evt_ring;
dma_addr_t tx_ring_dma;
dma_addr_t rx_ring_dma;
dma_addr_t evt_ring_dma;
/* Alignment ok ? */
struct sk_buff *rx_skbuff[RX_RING_ENTRIES];
struct sk_buff *tx_skbuff[TX_RING_ENTRIES];
struct rr_regs __iomem *regs; /* Register base */
struct ring_ctrl *rx_ctrl; /* Receive ring control */
struct rr_info *info; /* Shared info page */
dma_addr_t rx_ctrl_dma;
dma_addr_t info_dma;
spinlock_t lock;
struct timer_list timer;
u32 cur_rx, cur_cmd, cur_evt;
u32 dirty_rx, dirty_tx;
u32 tx_full;
u32 fw_rev;
volatile short fw_running;
struct net_device_stats stats;
struct pci_dev *pci_dev;
};
/*
* Prototypes
*/
static int rr_init(struct net_device *dev);
static int rr_init1(struct net_device *dev);
static irqreturn_t rr_interrupt(int irq, void *dev_id);
static int rr_open(struct net_device *dev);
static int rr_start_xmit(struct sk_buff *skb, struct net_device *dev);
static int rr_close(struct net_device *dev);
static struct net_device_stats *rr_get_stats(struct net_device *dev);
static int rr_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
static unsigned int rr_read_eeprom(struct rr_private *rrpriv,
unsigned long offset,
unsigned char *buf,
unsigned long length);
static u32 rr_read_eeprom_word(struct rr_private *rrpriv, void * offset);
static int rr_load_firmware(struct net_device *dev);
static inline void rr_raz_tx(struct rr_private *, struct net_device *);
static inline void rr_raz_rx(struct rr_private *, struct net_device *);
#endif /* _RRUNNER_H_ */
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