FreeBSD/Linux Kernel Cross Reference
sys/dev/netif/sis/if_sisreg.h

     /*
      * Copyright (c) 1997, 1998, 1999
      *      Bill Paul <wpaul@ee.columbia.edu>.  All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by Bill Paul.
     * 4. Neither the name of the author nor the names of any co-contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL Bill Paul OR THE VOICES IN HIS HEAD
     * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
     * THE POSSIBILITY OF SUCH DAMAGE.
     *
     * $FreeBSD: src/sys/pci/if_sisreg.h,v 1.1.4.11 2003/02/05 21:49:01 mbr Exp $
     * $DragonFly: src/sys/dev/netif/sis/if_sisreg.h,v 1.7 2006/08/01 18:09:37 swildner Exp $
     */
    
    /*
     * Register definitions for the SiS 900 and SiS 7016 chipsets. The
     * 7016 is actually an older chip and some of its registers differ
     * from the 900, however the core operational registers are the same:
     * the differences lie in the OnNow/Wake on LAN stuff which we don't
     * use anyway. The 7016 needs an external MII compliant PHY while the
     * SiS 900 has one built in. All registers are 32-bits wide.
     */
    
    /* Registers common to SiS 900 and SiS 7016 */
    #define SIS_CSR                 0x00
    #define SIS_CFG                 0x04
    #define SIS_EECTL               0x08
    #define SIS_PCICTL              0x0C
    #define SIS_ISR                 0x10
    #define SIS_IMR                 0x14
    #define SIS_IER                 0x18
    #define SIS_PHYCTL              0x1C
    #define SIS_TX_LISTPTR          0x20
    #define SIS_TX_CFG              0x24
    #define SIS_RX_LISTPTR          0x30
    #define SIS_RX_CFG              0x34
    #define SIS_FLOWCTL             0x38
    #define SIS_RXFILT_CTL          0x48
    #define SIS_RXFILT_DATA         0x4C
    #define SIS_PWRMAN_CTL          0xB0
    #define SIS_PWERMAN_WKUP_EVENT  0xB4
    #define SIS_WKUP_FRAME_CRC      0xBC
    #define SIS_WKUP_FRAME_MASK0    0xC0
    #define SIS_WKUP_FRAME_MASKXX   0xEC
    
    /* SiS 7016 specific registers */
    #define SIS_SILICON_REV         0x5C
    #define SIS_MIB_CTL0            0x60
    #define SIS_MIB_CTL1            0x64
    #define SIS_MIB_CTL2            0x68
    #define SIS_MIB_CTL3            0x6C
    #define SIS_MIB                 0x80
    #define SIS_LINKSTS             0xA0
    #define SIS_TIMEUNIT            0xA4
    #define SIS_GPIO                0xB8
    
    /* NS DP83815 registers */
    #define NS_CLKRUN               0x3C
    #define NS_BMCR                 0x80
    #define NS_BMSR                 0x84
    #define NS_PHYIDR1              0x88
    #define NS_PHYIDR2              0x8C
    #define NS_ANAR                 0x90
    #define NS_ANLPAR               0x94
    #define NS_ANER                 0x98
    #define NS_ANNPTR               0x9C
    
    #define NS_PHY_CR               0xE4
    #define NS_PHY_10BTSCR          0xE8
    #define NS_PHY_PAGE             0xCC
    #define NS_PHY_EXTCFG           0xF0
    #define NS_PHY_DSPCFG           0xF4
    #define NS_PHY_SDCFG            0xF8
    #define NS_PHY_TDATA            0xFC
    
    #define NS_CLKRUN_PMESTS        0x00008000
    #define NS_CLKRUN_PMEENB        0x00000100
    #define NS_CLNRUN_CLKRUN_ENB    0x00000001
   
   #define SIS_CSR_TX_ENABLE       0x00000001
   #define SIS_CSR_TX_DISABLE      0x00000002
   #define SIS_CSR_RX_ENABLE       0x00000004
   #define SIS_CSR_RX_DISABLE      0x00000008
   #define SIS_CSR_TX_RESET        0x00000010
   #define SIS_CSR_RX_RESET        0x00000020
   #define SIS_CSR_SOFTINTR        0x00000080
   #define SIS_CSR_RESET           0x00000100
   #define SIS_CSR_ACCESS_MODE     0x00000200
   #define SIS_CSR_RELOAD          0x00000400
   
   #define SIS_CFG_BIGENDIAN       0x00000001
   #define SIS_CFG_PERR_DETECT     0x00000008
   #define SIS_CFG_DEFER_DISABLE   0x00000010
   #define SIS_CFG_OUTOFWIN_TIMER  0x00000020
   #define SIS_CFG_SINGLE_BACKOFF  0x00000040
   #define SIS_CFG_PCIREQ_ALG      0x00000080
   #define SIS_CFG_FAIR_BACKOFF    0x00000200 /* 635 & 900B Specific */
   #define SIS_CFG_RND_CNT         0x00000400 /* 635 & 900B Specific */
   #define SIS_CFG_EDB_MASTER_EN   0x00002000
   
   #define SIS_EECTL_DIN           0x00000001
   #define SIS_EECTL_DOUT          0x00000002
   #define SIS_EECTL_CLK           0x00000004
   #define SIS_EECTL_CSEL          0x00000008
   
   #define SIS_MII_CLK             0x00000040
   #define SIS_MII_DIR             0x00000020
   #define SIS_MII_DATA            0x00000010
   
   #define SIS_EECMD_WRITE         0x140
   #define SIS_EECMD_READ          0x180
   #define SIS_EECMD_ERASE         0x1c0
   
   /*
    * EEPROM Commands for SiS96x
    * chipsets.
    */
   #define SIS_EECMD_REQ           0x00000400
   #define SIS_EECMD_DONE          0x00000200
   #define SIS_EECMD_GNT           0x00000100
   
   #define SIS_EE_NODEADDR         0x8
   #define NS_EE_NODEADDR          0x6
   
   #define SIS_PCICTL_SRAMADDR     0x0000001F
   #define SIS_PCICTL_RAMTSTENB    0x00000020
   #define SIS_PCICTL_TXTSTENB     0x00000040
   #define SIS_PCICTL_RXTSTENB     0x00000080
   #define SIS_PCICTL_BMTSTENB     0x00000200
   #define SIS_PCICTL_RAMADDR      0x001F0000
   #define SIS_PCICTL_ROMTIME      0x0F000000
   #define SIS_PCICTL_DISCTEST     0x40000000
   
   #define SIS_ISR_RX_OK           0x00000001
   #define SIS_ISR_RX_DESC_OK      0x00000002
   #define SIS_ISR_RX_ERR          0x00000004
   #define SIS_ISR_RX_EARLY        0x00000008
   #define SIS_ISR_RX_IDLE         0x00000010
   #define SIS_ISR_RX_OFLOW        0x00000020
   #define SIS_ISR_TX_OK           0x00000040
   #define SIS_ISR_TX_DESC_OK      0x00000080
   #define SIS_ISR_TX_ERR          0x00000100
   #define SIS_ISR_TX_IDLE         0x00000200
   #define SIS_ISR_TX_UFLOW        0x00000400
   #define SIS_ISR_SOFTINTR        0x00000800
   #define SIS_ISR_HIBITS          0x00008000
   #define SIS_ISR_RX_FIFO_OFLOW   0x00010000
   #define SIS_ISR_TGT_ABRT        0x00100000
   #define SIS_ISR_BM_ABRT         0x00200000
   #define SIS_ISR_SYSERR          0x00400000
   #define SIS_ISR_PARITY_ERR      0x00800000
   #define SIS_ISR_RX_RESET_DONE   0x01000000
   #define SIS_ISR_TX_RESET_DONE   0x02000000
   #define SIS_ISR_TX_PAUSE_START  0x04000000
   #define SIS_ISR_TX_PAUSE_DONE   0x08000000
   #define SIS_ISR_WAKE_EVENT      0x10000000
   
   #define SIS_IMR_RX_OK           0x00000001
   #define SIS_IMR_RX_DESC_OK      0x00000002
   #define SIS_IMR_RX_ERR          0x00000004
   #define SIS_IMR_RX_EARLY        0x00000008
   #define SIS_IMR_RX_IDLE         0x00000010
   #define SIS_IMR_RX_OFLOW        0x00000020
   #define SIS_IMR_TX_OK           0x00000040
   #define SIS_IMR_TX_DESC_OK      0x00000080
   #define SIS_IMR_TX_ERR          0x00000100
   #define SIS_IMR_TX_IDLE         0x00000200
   #define SIS_IMR_TX_UFLOW        0x00000400
   #define SIS_IMR_SOFTINTR        0x00000800
   #define SIS_IMR_HIBITS          0x00008000
   #define SIS_IMR_RX_FIFO_OFLOW   0x00010000
   #define SIS_IMR_TGT_ABRT        0x00100000
   #define SIS_IMR_BM_ABRT         0x00200000
   #define SIS_IMR_SYSERR          0x00400000
   #define SIS_IMR_PARITY_ERR      0x00800000
   #define SIS_IMR_RX_RESET_DONE   0x01000000
   #define SIS_IMR_TX_RESET_DONE   0x02000000
   #define SIS_IMR_TX_PAUSE_START  0x04000000
   #define SIS_IMR_TX_PAUSE_DONE   0x08000000
   #define SIS_IMR_WAKE_EVENT      0x10000000
   
   #define SIS_INTRS       \
           (SIS_IMR_RX_OFLOW|SIS_IMR_TX_UFLOW|SIS_IMR_TX_OK|\
            SIS_IMR_TX_IDLE|SIS_IMR_RX_OK|SIS_IMR_RX_ERR|\
            SIS_IMR_RX_IDLE|\
            SIS_IMR_SYSERR)
   
   #define SIS_IER_INTRENB         0x00000001
   
   #define SIS_PHYCTL_ACCESS       0x00000010
   #define SIS_PHYCTL_OP           0x00000020
   #define SIS_PHYCTL_REGADDR      0x000007C0
   #define SIS_PHYCTL_PHYADDR      0x0000F800
   #define SIS_PHYCTL_PHYDATA      0xFFFF0000
   
   #define SIS_PHYOP_READ          0x00000020
   #define SIS_PHYOP_WRITE         0x00000000
   
   #define SIS_TXCFG_DRAIN_THRESH  0x0000003F /* 32-byte units */
   #define SIS_TXCFG_FILL_THRESH   0x00003F00 /* 32-byte units */
   #define SIS_TXCFG_DMABURST      0x00700000
   #define SIS_TXCFG_AUTOPAD       0x10000000
   #define SIS_TXCFG_LOOPBK        0x20000000
   #define SIS_TXCFG_IGN_HBEAT     0x40000000
   #define SIS_TXCFG_IGN_CARR      0x80000000
   
   #define SIS_TXCFG_DRAIN(x)      (((x) >> 5) & SIS_TXCFG_DRAIN_THRESH)
   #define SIS_TXCFG_FILL(x)       ((((x) >> 5) << 8) & SIS_TXCFG_FILL_THRESH)
   
   #define SIS_TXDMA_512BYTES      0x00000000
   #define SIS_TXDMA_4BYTES        0x00100000
   #define SIS_TXDMA_8BYTES        0x00200000
   #define SIS_TXDMA_16BYTES       0x00300000
   #define SIS_TXDMA_32BYTES       0x00400000
   #define SIS_TXDMA_64BYTES       0x00500000
   #define SIS_TXDMA_128BYTES      0x00600000
   #define SIS_TXDMA_256BYTES      0x00700000
   
   #define SIS_TXCFG_100   \
           (SIS_TXDMA_64BYTES|SIS_TXCFG_AUTOPAD|\
            SIS_TXCFG_FILL(64)|SIS_TXCFG_DRAIN(1536))
   
   #define SIS_TXCFG_10    \
           (SIS_TXDMA_32BYTES|SIS_TXCFG_AUTOPAD|\
            SIS_TXCFG_FILL(64)|SIS_TXCFG_DRAIN(1536))
   
   #define SIS_RXCFG_DRAIN_THRESH  0x0000003E /* 8-byte units */
   #define SIS_RXCFG_DMABURST      0x00700000
   #define SIS_RXCFG_RX_JABBER     0x08000000
   #define SIS_RXCFG_RX_TXPKTS     0x10000000
   #define SIS_RXCFG_RX_RUNTS      0x40000000
   #define SIS_RXCFG_RX_GIANTS     0x80000000
   
   #define SIS_RXCFG_DRAIN(x)      ((((x) >> 3) << 1) & SIS_RXCFG_DRAIN_THRESH)
   
   #define SIS_RXDMA_512BYTES      0x00000000
   #define SIS_RXDMA_4BYTES        0x00100000
   #define SIS_RXDMA_8BYTES        0x00200000
   #define SIS_RXDMA_16BYTES       0x00300000
   #define SIS_RXDMA_32BYTES       0x00400000
   #define SIS_RXDMA_64BYTES       0x00500000
   #define SIS_RXDMA_128BYTES      0x00600000
   #define SIS_RXDMA_256BYTES      0x00700000
   
   #define SIS_RXCFG256 \
           (SIS_RXCFG_DRAIN(64) | SIS_RXDMA_256BYTES)
   #define SIS_RXCFG64 \
           (SIS_RXCFG_DRAIN(64) | SIS_RXDMA_64BYTES)
   
   #define SIS_RXFILTCTL_ADDR      0x000F0000
   #define NS_RXFILTCTL_MCHASH     0x00200000
   #define NS_RXFILTCTL_ARP        0x00400000
   #define NS_RXFILTCTL_PERFECT    0x08000000
   #define SIS_RXFILTCTL_ALLPHYS   0x10000000
   #define SIS_RXFILTCTL_ALLMULTI  0x20000000
   #define SIS_RXFILTCTL_BROAD     0x40000000
   #define SIS_RXFILTCTL_ENABLE    0x80000000
   
   #define SIS_FILTADDR_PAR0       0x00000000
   #define SIS_FILTADDR_PAR1       0x00010000
   #define SIS_FILTADDR_PAR2       0x00020000
   #define SIS_FILTADDR_MAR0       0x00040000
   #define SIS_FILTADDR_MAR1       0x00050000
   #define SIS_FILTADDR_MAR2       0x00060000
   #define SIS_FILTADDR_MAR3       0x00070000
   #define SIS_FILTADDR_MAR4       0x00080000
   #define SIS_FILTADDR_MAR5       0x00090000
   #define SIS_FILTADDR_MAR6       0x000A0000
   #define SIS_FILTADDR_MAR7       0x000B0000
   
   #define NS_FILTADDR_PAR0        0x00000000
   #define NS_FILTADDR_PAR1        0x00000002
   #define NS_FILTADDR_PAR2        0x00000004
   
   #define NS_FILTADDR_FMEM_LO     0x00000200
   #define NS_FILTADDR_FMEM_HI     0x000003FE
   
   /*
    * DMA descriptor structures.
    */
   struct sis_desc {
           /* SiS hardware descriptor section */
           uint32_t                sis_next;
           uint32_t                sis_cmdsts;
   #define sis_rxstat              sis_cmdsts
   #define sis_txstat              sis_cmdsts
   #define sis_ctl                 sis_cmdsts
           uint32_t                sis_ptr;
   };
   
   #define SIS_RING_ALIGN          4
   
   #define SIS_CMDSTS_BUFLEN       0x00000FFF
   #define SIS_CMDSTS_PKT_OK       0x08000000
   #define SIS_CMDSTS_CRC          0x10000000
   #define SIS_CMDSTS_INTR         0x20000000
   #define SIS_CMDSTS_MORE         0x40000000
   #define SIS_CMDSTS_OWN          0x80000000
   
   #define SIS_LASTDESC(x)         (!((x)->sis_ctl & SIS_CMDSTS_MORE)))
   #define SIS_OWNDESC(x)          ((x)->sis_ctl & SIS_CMDSTS_OWN)
   #define SIS_INC(x, y)           (x) = ((x) == ((y)-1)) ? 0 : (x)+1
   #define SIS_RXBYTES(x)          (((x)->sis_ctl & SIS_CMDSTS_BUFLEN) - ETHER_CRC_LEN)
   
   #define SIS_RXSTAT_COLL         0x00010000
   #define SIS_RXSTAT_LOOPBK       0x00020000
   #define SIS_RXSTAT_ALIGNERR     0x00040000
   #define SIS_RXSTAT_CRCERR       0x00080000
   #define SIS_RXSTAT_SYMBOLERR    0x00100000
   #define SIS_RXSTAT_RUNT         0x00200000
   #define SIS_RXSTAT_GIANT        0x00400000
   #define SIS_RXSTAT_DSTCLASS     0x01800000
   #define SIS_RXSTAT_OVERRUN      0x02000000
   #define SIS_RXSTAT_RX_ABORT     0x04000000
   
   #define SIS_DSTCLASS_REJECT     0x00000000
   #define SIS_DSTCLASS_UNICAST    0x00800000
   #define SIS_DSTCLASS_MULTICAST  0x01000000
   #define SIS_DSTCLASS_BROADCAST  0x02000000
   
   #define SIS_TXSTAT_COLLCNT      0x000F0000
   #define SIS_TXSTAT_EXCESSCOLLS  0x00100000
   #define SIS_TXSTAT_OUTOFWINCOLL 0x00200000
   #define SIS_TXSTAT_EXCESS_DEFER 0x00400000
   #define SIS_TXSTAT_DEFERED      0x00800000
   #define SIS_TXSTAT_CARR_LOST    0x01000000
   #define SIS_TXSTAT_UNDERRUN     0x02000000
   #define SIS_TXSTAT_TX_ABORT     0x04000000
   
   #define SIS_RX_LIST_CNT         64
   #define SIS_TX_LIST_CNT         128
   
   #define SIS_RX_LIST_SZ          (SIS_RX_LIST_CNT * sizeof(struct sis_desc))
   #define SIS_TX_LIST_SZ          (SIS_TX_LIST_CNT * sizeof(struct sis_desc))
   
   struct sis_list_data {
           bus_dma_tag_t           sis_rx_tag;
           bus_dmamap_t            sis_rx_dmamap;
           struct sis_desc         *sis_rx_list;
           bus_addr_t              sis_rx_paddr;
   
           bus_dma_tag_t           sis_tx_tag;
           bus_dmamap_t            sis_tx_dmamap;
           struct sis_desc         *sis_tx_list;
           bus_addr_t              sis_tx_paddr;
   };
   
   struct sis_rx_data {
           struct mbuf             *sis_mbuf;
           bus_dmamap_t            sis_map;
           bus_addr_t              sis_paddr;
   };
   
   struct sis_tx_data {
           struct mbuf             *sis_mbuf;
           bus_dmamap_t            sis_map;
   };
   
   struct sis_chain_data {
           bus_dma_tag_t           sis_rxbuf_tag;
           bus_dmamap_t            sis_rx_tmpmap;
           struct sis_rx_data      sis_rx_data[SIS_RX_LIST_CNT];
           int                     sis_rx_prod;
   
           bus_dma_tag_t           sis_txbuf_tag;
           struct sis_tx_data      sis_tx_data[SIS_TX_LIST_CNT];
           int                     sis_tx_prod;
           int                     sis_tx_cons;
           int                     sis_tx_cnt;
   };
   
   /*
    * SiS 900 PCI revision codes.
    */
   #define SIS_REV_900B            0x0003
   #define SIS_REV_630A            0x0080
   #define SIS_REV_630E            0x0081
   #define SIS_REV_630S            0x0082
   #define SIS_REV_630EA1          0x0083
   #define SIS_REV_630ET           0x0084
   #define SIS_REV_635             0x0090
   #define SIS_REV_96x             0x0091
   
   struct sis_type {
           uint16_t                sis_vid;
           uint16_t                sis_did;
           char                    *sis_name;
   };
   
   struct sis_mii_frame {
           uint8_t                 mii_stdelim;
           uint8_t                 mii_opcode;
           uint8_t                 mii_phyaddr;
           uint8_t                 mii_regaddr;
           uint8_t                 mii_turnaround;
           uint16_t                mii_data;
   };
   
   /*
    * MII constants
    */
   #define SIS_MII_STARTDELIM      0x01
   #define SIS_MII_READOP          0x02
   #define SIS_MII_WRITEOP         0x01
   #define SIS_MII_TURNAROUND      0x02
   
   #define SIS_TYPE_900            1
   #define SIS_TYPE_7016           2
   #define SIS_TYPE_83815          3
   
   struct sis_softc {
           struct arpcom           arpcom;         /* interface info */
           bus_space_handle_t      sis_bhandle;
           bus_space_tag_t         sis_btag;
           struct resource         *sis_res;
           struct resource         *sis_irq;
           void                    *sis_intrhand;
           device_t                sis_miibus;
           uint8_t                 sis_type;
           uint8_t                 sis_rev;
           uint8_t                 sis_link;
           struct ifpoll_compat    sis_npoll;
           struct sis_list_data    sis_ldata;
           bus_dma_tag_t           sis_parent_tag;
           struct sis_chain_data   sis_cdata;
           struct callout          sis_timer;
           int                     rxcycles;
   };
   
   #define SIS_RXBUF_ALIGN         4
   #define SIS_NSEGS               32      /* XXX limitted by TX desc cnt */
   #define SIS_NSEGS_RESERVED      1
   
   #define SIS_IS_OACTIVE(sc)      \
           ((sc)->sis_cdata.sis_tx_cnt + SIS_NSEGS_RESERVED >= SIS_TX_LIST_CNT)
   
   /*
    * register space access macros
    */
   #define CSR_WRITE_4(sc, reg, val)       \
           bus_space_write_4(sc->sis_btag, sc->sis_bhandle, reg, val)
   
   #define CSR_READ_4(sc, reg)             \
           bus_space_read_4(sc->sis_btag, sc->sis_bhandle, reg)
   
   #define CSR_READ_2(sc, reg)             \
           bus_space_read_2(sc->sis_btag, sc->sis_bhandle, reg)
   
   #define SIS_TIMEOUT             1000
   #define ETHER_ALIGN             2
   #define SIS_RXLEN               1536
   #define SIS_MIN_FRAMELEN        60
   
   /*
    * PCI low memory base and low I/O base register, and
    * other PCI registers.
    */
   
   #define SIS_PCI_VENDOR_ID       0x00
   #define SIS_PCI_DEVICE_ID       0x02
   #define SIS_PCI_COMMAND         0x04
   #define SIS_PCI_STATUS          0x06
   #define SIS_PCI_REVID           0x08
   #define SIS_PCI_CLASSCODE       0x09
   #define SIS_PCI_CACHELEN        0x0C
   #define SIS_PCI_LATENCY_TIMER   0x0D
   #define SIS_PCI_HEADER_TYPE     0x0E
   #define SIS_PCI_LOIO            0x10
   #define SIS_PCI_LOMEM           0x14
   #define SIS_PCI_BIOSROM         0x30
   #define SIS_PCI_INTLINE         0x3C
   #define SIS_PCI_INTPIN          0x3D
   #define SIS_PCI_MINGNT          0x3E
   #define SIS_PCI_MINLAT          0x0F
   #define SIS_PCI_RESETOPT        0x48
   #define SIS_PCI_EEPROM_DATA     0x4C
   
   /* power management registers */
   #define SIS_PCI_CAPID           0x50 /* 8 bits */
   #define SIS_PCI_NEXTPTR         0x51 /* 8 bits */
   #define SIS_PCI_PWRMGMTCAP      0x52 /* 16 bits */
   #define SIS_PCI_PWRMGMTCTRL     0x54 /* 16 bits */
   
   #define SIS_PSTATE_MASK         0x0003
   #define SIS_PSTATE_D0           0x0000
   #define SIS_PSTATE_D1           0x0001
   #define SIS_PSTATE_D2           0x0002
   #define SIS_PSTATE_D3           0x0003
   #define SIS_PME_EN              0x0010
   #define SIS_PME_STATUS          0x8000

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