de4x5.c

linux-2.6.15.6

*/
#define DE4X5_ALIGN4      ((u_long)4 - 1)     /* 1 longword align */
#define DE4X5_ALIGN8      ((u_long)8 - 1)     /* 2 longword align */
#define DE4X5_ALIGN16     ((u_long)16 - 1)    /* 4 longword align */
#define DE4X5_ALIGN32     ((u_long)32 - 1)    /* 8 longword align */
#define DE4X5_ALIGN64     ((u_long)64 - 1)    /* 16 longword align */
#define DE4X5_ALIGN128    ((u_long)128 - 1)   /* 32 longword align */

#define DE4X5_ALIGN         DE4X5_ALIGN32           /* Keep the DC21040 happy... */
#define DE4X5_CACHE_ALIGN   CAL_16LONG
#define DESC_SKIP_LEN DSL_0             /* Must agree with DESC_ALIGN */
/*#define DESC_ALIGN    u32 dummy[4];  / * Must agree with DESC_SKIP_LEN */
#define DESC_ALIGN

#ifndef DEC_ONLY                        /* See README.de4x5 for using this */
static int dec_only;
#else
static int dec_only = 1;
#endif

/*
** DE4X5 IRQ ENABLE/DISABLE
*/
#define ENABLE_IRQs { \
    imr |= lp->irq_en;\
    outl(imr, DE4X5_IMR);               /* Enable the IRQs */\
}

#define DISABLE_IRQs {\
    imr = inl(DE4X5_IMR);\
    imr &= ~lp->irq_en;\
    outl(imr, DE4X5_IMR);               /* Disable the IRQs */\
}

#define UNMASK_IRQs {\
    imr |= lp->irq_mask;\
    outl(imr, DE4X5_IMR);               /* Unmask the IRQs */\
}

#define MASK_IRQs {\
    imr = inl(DE4X5_IMR);\
    imr &= ~lp->irq_mask;\
    outl(imr, DE4X5_IMR);               /* Mask the IRQs */\
}

/*
** DE4X5 START/STOP
*/
#define START_DE4X5 {\
    omr = inl(DE4X5_OMR);\
    omr |= OMR_ST | OMR_SR;\
    outl(omr, DE4X5_OMR);               /* Enable the TX and/or RX */\
}

#define STOP_DE4X5 {\
    omr = inl(DE4X5_OMR);\
    omr &= ~(OMR_ST|OMR_SR);\
    outl(omr, DE4X5_OMR);               /* Disable the TX and/or RX */ \
}

/*
** DE4X5 SIA RESET
*/
#define RESET_SIA outl(0, DE4X5_SICR);  /* Reset SIA connectivity regs */

/*
** DE500 AUTOSENSE TIMER INTERVAL (MILLISECS)
*/
#define DE4X5_AUTOSENSE_MS  250

/*
** SROM Structure
*/
struct de4x5_srom {
    char sub_vendor_id[2];
    char sub_system_id[2];
    char reserved[12];
    char id_block_crc;
    char reserved2;
    char version;
    char num_controllers;
    char ieee_addr[6];
    char info[100];
    short chksum;
};
#define SUB_VENDOR_ID 0x500a

/*
** DE4X5 Descriptors. Make sure that all the RX buffers are contiguous
** and have sizes of both a power of 2 and a multiple of 4.
** A size of 256 bytes for each buffer could be chosen because over 90% of
** all packets in our network are <256 bytes long and 64 longword alignment
** is possible. 1536 showed better 'ttcp' performance. Take your pick. 32 TX
** descriptors are needed for machines with an ALPHA CPU.
*/
#define NUM_RX_DESC 8                   /* Number of RX descriptors   */
#define NUM_TX_DESC 32                  /* Number of TX descriptors   */
#define RX_BUFF_SZ  1536                /* Power of 2 for kmalloc and */
                                        /* Multiple of 4 for DC21040  */
                                        /* Allows 512 byte alignment  */
struct de4x5_desc {
    volatile s32 status;
    u32 des1;
    u32 buf;
    u32 next;
    DESC_ALIGN
};

/*
** The DE4X5 private structure
*/
#define DE4X5_PKT_STAT_SZ 16
#define DE4X5_PKT_BIN_SZ  128            /* Should be >=100 unless you
                                            increase DE4X5_PKT_STAT_SZ */

struct pkt_stats {
	u_int bins[DE4X5_PKT_STAT_SZ];      /* Private stats counters       */
	u_int unicast;
	u_int multicast;
	u_int broadcast;
	u_int excessive_collisions;
	u_int tx_underruns;
	u_int excessive_underruns;
	u_int rx_runt_frames;
	u_int rx_collision;
	u_int rx_dribble;
	u_int rx_overflow;
};

struct de4x5_private {
    char adapter_name[80];                  /* Adapter name                 */
    u_long interrupt;                       /* Aligned ISR flag             */
    struct de4x5_desc *rx_ring;		    /* RX descriptor ring           */
    struct de4x5_desc *tx_ring;		    /* TX descriptor ring           */
    struct sk_buff *tx_skb[NUM_TX_DESC];    /* TX skb for freeing when sent */
    struct sk_buff *rx_skb[NUM_RX_DESC];    /* RX skb's                     */
    int rx_new, rx_old;                     /* RX descriptor ring pointers  */
    int tx_new, tx_old;                     /* TX descriptor ring pointers  */
    char setup_frame[SETUP_FRAME_LEN];      /* Holds MCA and PA info.       */
    char frame[64];                         /* Min sized packet for loopback*/
    spinlock_t lock;                        /* Adapter specific spinlock    */
    struct net_device_stats stats;          /* Public stats                 */
    struct pkt_stats pktStats;	            /* Private stats counters	    */
    char rxRingSize;
    char txRingSize;
    int  bus;                               /* EISA or PCI                  */
    int  bus_num;                           /* PCI Bus number               */
    int  device;                            /* Device number on PCI bus     */
    int  state;                             /* Adapter OPENED or CLOSED     */
    int  chipset;                           /* DC21040, DC21041 or DC21140  */
    s32  irq_mask;                          /* Interrupt Mask (Enable) bits */
    s32  irq_en;                            /* Summary interrupt bits       */
    int  media;                             /* Media (eg TP), mode (eg 100B)*/
    int  c_media;                           /* Remember the last media conn */
    int  fdx;                               /* media full duplex flag       */
    int  linkOK;                            /* Link is OK                   */
    int  autosense;                         /* Allow/disallow autosensing   */
    int  tx_enable;                         /* Enable descriptor polling    */
    int  setup_f;                           /* Setup frame filtering type   */
    int  local_state;                       /* State within a 'media' state */
    struct mii_phy phy[DE4X5_MAX_PHY];      /* List of attached PHY devices */
    struct sia_phy sia;                     /* SIA PHY Information          */
    int  active;                            /* Index to active PHY device   */
    int  mii_cnt;                           /* Number of attached PHY's     */
    int  timeout;                           /* Scheduling counter           */
    struct timer_list timer;                /* Timer info for kernel        */
    int tmp;                                /* Temporary global per card    */
    struct {
	u_long lock;                        /* Lock the cache accesses      */
	s32 csr0;                           /* Saved Bus Mode Register      */
	s32 csr6;                           /* Saved Operating Mode Reg.    */
	s32 csr7;                           /* Saved IRQ Mask Register      */
	s32 gep;                            /* Saved General Purpose Reg.   */
	s32 gepc;                           /* Control info for GEP         */
	s32 csr13;                          /* Saved SIA Connectivity Reg.  */
	s32 csr14;                          /* Saved SIA TX/RX Register     */
	s32 csr15;                          /* Saved SIA General Register   */
	int save_cnt;                       /* Flag if state already saved  */
	struct sk_buff *skb;                /* Save the (re-ordered) skb's  */
    } cache;
    struct de4x5_srom srom;                 /* A copy of the SROM           */
    int cfrv;				    /* Card CFRV copy */
    int rx_ovf;                             /* Check for 'RX overflow' tag  */
    int useSROM;                            /* For non-DEC card use SROM    */
    int useMII;                             /* Infoblock using the MII      */
    int asBitValid;                         /* Autosense bits in GEP?       */
    int asPolarity;                         /* 0 => asserted high           */
    int asBit;                              /* Autosense bit number in GEP  */
    int defMedium;                          /* SROM default medium          */
    int tcount;                             /* Last infoblock number        */
    int infoblock_init;                     /* Initialised this infoblock?  */
    int infoleaf_offset;                    /* SROM infoleaf for controller */
    s32 infoblock_csr6;                     /* csr6 value in SROM infoblock */
    int infoblock_media;                    /* infoblock media              */
    int (*infoleaf_fn)(struct net_device *);    /* Pointer to infoleaf function */
    u_char *rst;                            /* Pointer to Type 5 reset info */
    u_char  ibn;                            /* Infoblock number             */
    struct parameters params;               /* Command line/ #defined params */
    struct device *gendev;	            /* Generic device */
    dma_addr_t dma_rings;		    /* DMA handle for rings	    */
    int dma_size;			    /* Size of the DMA area	    */
    char *rx_bufs;			    /* rx bufs on alpha, sparc, ... */
};

/*
** To get around certain poxy cards that don't provide an SROM
** for the second and more DECchip, I have to key off the first
** chip's address. I'll assume there's not a bad SROM iff:
**
**      o the chipset is the same
**      o the bus number is the same and > 0
**      o the sum of all the returned hw address bytes is 0 or 0x5fa
**
** Also have to save the irq for those cards whose hardware designers
** can't follow the PCI to PCI Bridge Architecture spec.
*/
static struct {
    int chipset;
    int bus;
    int irq;
    u_char addr[ETH_ALEN];
} last = {0,};

/*
** The transmit ring full condition is described by the tx_old and tx_new
** pointers by:
**    tx_old            = tx_new    Empty ring
**    tx_old            = tx_new+1  Full ring
**    tx_old+txRingSize = tx_new+1  Full ring  (wrapped condition)
*/
#define TX_BUFFS_AVAIL ((lp->tx_old<=lp->tx_new)?\
			lp->tx_old+lp->txRingSize-lp->tx_new-1:\
			lp->tx_old               -lp->tx_new-1)

#define TX_PKT_PENDING (lp->tx_old != lp->tx_new)

/*
** Public Functions
*/
static int     de4x5_open(struct net_device *dev);
static int     de4x5_queue_pkt(struct sk_buff *skb, struct net_device *dev);
static irqreturn_t de4x5_interrupt(int irq, void *dev_id, struct pt_regs *regs);
static int     de4x5_close(struct net_device *dev);
static struct  net_device_stats *de4x5_get_stats(struct net_device *dev);
static void    de4x5_local_stats(struct net_device *dev, char *buf, int pkt_len);
static void    set_multicast_list(struct net_device *dev);
static int     de4x5_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);

/*
** Private functions
*/
static int     de4x5_hw_init(struct net_device *dev, u_long iobase, struct device *gendev);
static int     de4x5_init(struct net_device *dev);
static int     de4x5_sw_reset(struct net_device *dev);
static int     de4x5_rx(struct net_device *dev);
static int     de4x5_tx(struct net_device *dev);
static int     de4x5_ast(struct net_device *dev);
static int     de4x5_txur(struct net_device *dev);
static int     de4x5_rx_ovfc(struct net_device *dev);

static int     autoconf_media(struct net_device *dev);
static void    create_packet(struct net_device *dev, char *frame, int len);
static void    load_packet(struct net_device *dev, char *buf, u32 flags, struct sk_buff *skb);
static int     dc21040_autoconf(struct net_device *dev);
static int     dc21041_autoconf(struct net_device *dev);
static int     dc21140m_autoconf(struct net_device *dev);
static int     dc2114x_autoconf(struct net_device *dev);
static int     srom_autoconf(struct net_device *dev);
static int     de4x5_suspect_state(struct net_device *dev, int timeout, int prev_state, int (*fn)(struct net_device *, int), int (*asfn)(struct net_device *));
static int     dc21040_state(struct net_device *dev, int csr13, int csr14, int csr15, int timeout, int next_state, int suspect_state, int (*fn)(struct net_device *, int));
static int     test_media(struct net_device *dev, s32 irqs, s32 irq_mask, s32 csr13, s32 csr14, s32 csr15, s32 msec);
static int     test_for_100Mb(struct net_device *dev, int msec);
static int     wait_for_link(struct net_device *dev);
static int     test_mii_reg(struct net_device *dev, int reg, int mask, int pol, long msec);
static int     is_spd_100(struct net_device *dev);
static int     is_100_up(struct net_device *dev);
static int     is_10_up(struct net_device *dev);
static int     is_anc_capable(struct net_device *dev);
static int     ping_media(struct net_device *dev, int msec);
static struct sk_buff *de4x5_alloc_rx_buff(struct net_device *dev, int index, int len);
static void    de4x5_free_rx_buffs(struct net_device *dev);
static void    de4x5_free_tx_buffs(struct net_device *dev);
static void    de4x5_save_skbs(struct net_device *dev);
static void    de4x5_rst_desc_ring(struct net_device *dev);
static void    de4x5_cache_state(struct net_device *dev, int flag);
static void    de4x5_put_cache(struct net_device *dev, struct sk_buff *skb);
static void    de4x5_putb_cache(struct net_device *dev, struct sk_buff *skb);
static struct  sk_buff *de4x5_get_cache(struct net_device *dev);
static void    de4x5_setup_intr(struct net_device *dev);
static void    de4x5_init_connection(struct net_device *dev);
static int     de4x5_reset_phy(struct net_device *dev);
static void    reset_init_sia(struct net_device *dev, s32 sicr, s32 strr, s32 sigr);
static int     test_ans(struct net_device *dev, s32 irqs, s32 irq_mask, s32 msec);
static int     test_tp(struct net_device *dev, s32 msec);
static int     EISA_signature(char *name, struct device *device);
static int     PCI_signature(char *name, struct de4x5_private *lp);
static void    DevicePresent(struct net_device *dev, u_long iobase);
static void    enet_addr_rst(u_long aprom_addr);
static int     de4x5_bad_srom(struct de4x5_private *lp);
static short   srom_rd(u_long address, u_char offset);
static void    srom_latch(u_int command, u_long address);
static void    srom_command(u_int command, u_long address);
static void    srom_address(u_int command, u_long address, u_char offset);
static short   srom_data(u_int command, u_long address);
/*static void    srom_busy(u_int command, u_long address);*/
static void    sendto_srom(u_int command, u_long addr);
static int     getfrom_srom(u_long addr);
static int     srom_map_media(struct net_device *dev);
static int     srom_infoleaf_info(struct net_device *dev);
static void    srom_init(struct net_device *dev);
static void    srom_exec(struct net_device *dev, u_char *p);
static int     mii_rd(u_char phyreg, u_char phyaddr, u_long ioaddr);
static void    mii_wr(int data, u_char phyreg, u_char phyaddr, u_long ioaddr);
static int     mii_rdata(u_long ioaddr);
static void    mii_wdata(int data, int len, u_long ioaddr);
static void    mii_ta(u_long rw, u_long ioaddr);
static int     mii_swap(int data, int len);
static void    mii_address(u_char addr, u_long ioaddr);
static void    sendto_mii(u32 command, int data, u_long ioaddr);
static int     getfrom_mii(u32 command, u_long ioaddr);
static int     mii_get_oui(u_char phyaddr, u_long ioaddr);
static int     mii_get_phy(struct net_device *dev);
static void    SetMulticastFilter(struct net_device *dev);
static int     get_hw_addr(struct net_device *dev);
static void    srom_repair(struct net_device *dev, int card);
static int     test_bad_enet(struct net_device *dev, int status);
static int     an_exception(struct de4x5_private *lp);
static char    *build_setup_frame(struct net_device *dev, int mode);
static void    disable_ast(struct net_device *dev);