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/*

 * This file is subject to the terms and conditions of the GNU General Public

 * License. See the file "COPYING" in the main directory of this archive

 * for more details.

 *

 * hpc3.h: Definitions for SGI HPC3 controller

 *

 * Copyright (C) 1996 David S. Miller

 * Copyright (C) 1998 Ralf Baechle

 */

#ifndef _SGI_HPC3_H

#define _SGI_HPC3_H

#include <linux/types.h>

#include <asm/page.h>

/* An HPC DMA descriptor. */

struct hpc_dma_desc {

        u32 pbuf;       /* physical address of data buffer */

        u32 cntinfo;    /* counter and info bits */

#define HPCDMA_EOX      0x80000000 /* last desc in chain for tx */

#define HPCDMA_EOR      0x80000000 /* last desc in chain for rx */

#define HPCDMA_EOXP     0x40000000 /* end of packet for tx */

#define HPCDMA_EORP     0x40000000 /* end of packet for rx */

#define HPCDMA_XIE      0x20000000 /* irq generated when at end of this desc */

#define HPCDMA_XIU      0x01000000 /* Tx buffer in use by CPU. */

#define HPCDMA_EIPC     0x00ff0000 /* SEEQ ethernet special xternal bytecount */

#define HPCDMA_ETXD     0x00008000 /* set to one by HPC when packet tx'd */

#define HPCDMA_OWN      0x00004000 /* Denotes ring buffer ownership on rx */

#define HPCDMA_BCNT     0x00003fff /* size in bytes of this dma buffer */

        u32 pnext;      /* paddr of next hpc_dma_desc if any */

};

/* The set of regs for each HPC3 PBUS DMA channel. */

struct hpc3_pbus_dmacregs {

        volatile u32 pbdma_bptr;        /* pbus dma channel buffer ptr */

        volatile u32 pbdma_dptr;        /* pbus dma channel desc ptr */

        u32 _unused0[0x1000/4 - 2];     /* padding */

        volatile u32 pbdma_ctrl;        /* pbus dma channel control register has

                                         * copletely different meaning for read

                                         * compared with write */

        /* read */

#define HPC3_PDMACTRL_INT       0x00000001 /* interrupt (cleared after read) */

#define HPC3_PDMACTRL_ISACT     0x00000002 /* channel active */

        /* write */

#define HPC3_PDMACTRL_SEL       0x00000002 /* little endian transfer */

#define HPC3_PDMACTRL_RCV       0x00000004 /* direction is receive */

#define HPC3_PDMACTRL_FLSH      0x00000008 /* enable flush for receive DMA */

#define HPC3_PDMACTRL_ACT       0x00000010 /* start dma transfer */

#define HPC3_PDMACTRL_LD        0x00000020 /* load enable for ACT */

#define HPC3_PDMACTRL_RT        0x00000040 /* Use realtime GIO bus servicing */

#define HPC3_PDMACTRL_HW        0x0000ff00 /* DMA High-water mark */

#define HPC3_PDMACTRL_FB        0x003f0000 /* Ptr to beginning of fifo */

#define HPC3_PDMACTRL_FE        0x3f000000 /* Ptr to end of fifo */

        u32 _unused1[0x1000/4 - 1];     /* padding */

};

/* The HPC3 SCSI registers, this does not include external ones. */

struct hpc3_scsiregs {

        volatile u32 cbptr;     /* current dma buffer ptr, diagnostic use only */

        volatile u32 ndptr;     /* next dma descriptor ptr */

        u32 _unused0[0x1000/4 - 2];     /* padding */

        volatile u32 bcd;       /* byte count info */

#define HPC3_SBCD_BCNTMSK 0x00003fff /* bytes to transfer from/to memory */

#define HPC3_SBCD_XIE     0x00004000 /* Send IRQ when done with cur buf */

#define HPC3_SBCD_EOX     0x00008000 /* Indicates this is last buf in chain */

        volatile u32 ctrl;    /* control register */

#define HPC3_SCTRL_IRQ    0x01 /* IRQ asserted, either dma done or parity */

#define HPC3_SCTRL_ENDIAN 0x02 /* DMA endian mode, 0=big 1=little */

#define HPC3_SCTRL_DIR    0x04 /* DMA direction, 1=dev2mem 0=mem2dev */

#define HPC3_SCTRL_FLUSH  0x08 /* Tells HPC3 to flush scsi fifos */

#define HPC3_SCTRL_ACTIVE 0x10 /* SCSI DMA channel is active */

#define HPC3_SCTRL_AMASK  0x20 /* DMA active inhibits PIO */

#define HPC3_SCTRL_CRESET 0x40 /* Resets dma channel and external controller */

#define HPC3_SCTRL_PERR   0x80 /* Bad parity on HPC3 iface to scsi controller */

        volatile u32 gfptr;     /* current GIO fifo ptr */

        volatile u32 dfptr;     /* current device fifo ptr */

        volatile u32 dconfig;   /* DMA configuration register */

#define HPC3_SDCFG_HCLK 0x00001 /* Enable DMA half clock mode */

#define HPC3_SDCFG_D1   0x00006 /* Cycles to spend in D1 state */

#define HPC3_SDCFG_D2   0x00038 /* Cycles to spend in D2 state */

#define HPC3_SDCFG_D3   0x001c0 /* Cycles to spend in D3 state */

#define HPC3_SDCFG_HWAT 0x00e00 /* DMA high water mark */

#define HPC3_SDCFG_HW   0x01000 /* Enable 16-bit halfword DMA accesses to scsi */

#define HPC3_SDCFG_SWAP 0x02000 /* Byte swap all DMA accesses */

#define HPC3_SDCFG_EPAR 0x04000 /* Enable parity checking for DMA */

#define HPC3_SDCFG_POLL 0x08000 /* hd_dreq polarity control */

#define HPC3_SDCFG_ERLY 0x30000 /* hd_dreq behavior control bits */

        volatile u32 pconfig;   /* PIO configuration register */

#define HPC3_SPCFG_P3   0x0003 /* Cycles to spend in P3 state */

#define HPC3_SPCFG_P2W  0x001c /* Cycles to spend in P2 state for writes */

#define HPC3_SPCFG_P2R  0x01e0 /* Cycles to spend in P2 state for reads */

#define HPC3_SPCFG_P1   0x0e00 /* Cycles to spend in P1 state */

#define HPC3_SPCFG_HW   0x1000 /* Enable 16-bit halfword PIO accesses to scsi */

#define HPC3_SPCFG_SWAP 0x2000 /* Byte swap all PIO accesses */

#define HPC3_SPCFG_EPAR 0x4000 /* Enable parity checking for PIO */

#define HPC3_SPCFG_FUJI 0x8000 /* Fujitsu scsi controller mode for faster dma/pio */

        u32 _unused1[0x1000/4 - 6];     /* padding */

};

/* SEEQ ethernet HPC3 registers, only one seeq per HPC3. */

struct hpc3_ethregs {

        /* Receiver registers. */

        volatile u32 rx_cbptr;   /* current dma buffer ptr, diagnostic use only */

        volatile u32 rx_ndptr;   /* next dma descriptor ptr */

        u32 _unused0[0x1000/4 - 2];     /* padding */

        volatile u32 rx_bcd;    /* byte count info */

#define HPC3_ERXBCD_BCNTMSK 0x00003fff /* bytes to be sent to memory */

#define HPC3_ERXBCD_XIE     0x20000000 /* HPC3 interrupts cpu at end of this buf */

#define HPC3_ERXBCD_EOX     0x80000000 /* flags this as end of descriptor chain */

        volatile u32 rx_ctrl;   /* control register */

#define HPC3_ERXCTRL_STAT50 0x0000003f /* Receive status reg bits of Seeq8003 */

#define HPC3_ERXCTRL_STAT6  0x00000040 /* Rdonly irq status */

#define HPC3_ERXCTRL_STAT7  0x00000080 /* Rdonlt old/new status bit from Seeq */

#define HPC3_ERXCTRL_ENDIAN 0x00000100 /* Endian for dma channel, little=1 big=0 */

#define HPC3_ERXCTRL_ACTIVE 0x00000200 /* Tells if DMA transfer is in progress */

#define HPC3_ERXCTRL_AMASK  0x00000400 /* Tells if ACTIVE inhibits PIO's to hpc3 */

#define HPC3_ERXCTRL_RBO    0x00000800 /* Receive buffer overflow if set to 1 */

        volatile u32 rx_gfptr;  /* current GIO fifo ptr */

        volatile u32 rx_dfptr;  /* current device fifo ptr */

        u32 _unused1;           /* padding */

        volatile u32 rx_reset;  /* reset register */

#define HPC3_ERXRST_CRESET 0x1  /* Reset dma channel and external controller */

#define HPC3_ERXRST_CLRIRQ 0x2  /* Clear channel interrupt */

#define HPC3_ERXRST_LBACK  0x4  /* Enable diagnostic loopback mode of Seeq8003 */

        volatile u32 rx_dconfig;        /* DMA configuration register */

#define HPC3_ERXDCFG_D1    0x0000f /* Cycles to spend in D1 state for PIO */

#define HPC3_ERXDCFG_D2    0x000f0 /* Cycles to spend in D2 state for PIO */

#define HPC3_ERXDCFG_D3    0x00f00 /* Cycles to spend in D3 state for PIO */

#define HPC3_ERXDCFG_WCTRL 0x01000 /* Enable writes of desc into ex ctrl port */

#define HPC3_ERXDCFG_FRXDC 0x02000 /* Clear eop stat bits upon rxdc, hw seeq fix */

#define HPC3_ERXDCFG_FEOP  0x04000 /* Bad packet marker timeout enable */

#define HPC3_ERXDCFG_FIRQ  0x08000 /* Another bad packet timeout enable */

#define HPC3_ERXDCFG_PTO   0x30000 /* Programmed timeout value for above two */

        volatile u32 rx_pconfig;        /* PIO configuration register */

#define HPC3_ERXPCFG_P1    0x000f /* Cycles to spend in P1 state for PIO */

#define HPC3_ERXPCFG_P2    0x00f0 /* Cycles to spend in P2 state for PIO */

#define HPC3_ERXPCFG_P3    0x0f00 /* Cycles to spend in P3 state for PIO */

#define HPC3_ERXPCFG_TST   0x1000 /* Diagnistic ram test feature bit */

        u32 _unused2[0x1000/4 - 8];     /* padding */

        /* Transmitter registers. */

        volatile u32 tx_cbptr;  /* current dma buffer ptr, diagnostic use only */

        volatile u32 tx_ndptr;  /* next dma descriptor ptr */

        u32 _unused3[0x1000/4 - 2];     /* padding */

        volatile u32 tx_bcd;            /* byte count info */

#define HPC3_ETXBCD_BCNTMSK 0x00003fff  /* bytes to be read from memory */

#define HPC3_ETXBCD_ESAMP   0x10000000  /* if set, too late to add descriptor */

#define HPC3_ETXBCD_XIE     0x20000000  /* Interrupt cpu at end of cur desc */

#define HPC3_ETXBCD_EOP     0x40000000  /* Last byte of cur buf is end of packet */

#define HPC3_ETXBCD_EOX     0x80000000  /* This buf is the end of desc chain */

        volatile u32 tx_ctrl;           /* control register */

#define HPC3_ETXCTRL_STAT30 0x0000000f  /* Rdonly copy of seeq tx stat reg */

#define HPC3_ETXCTRL_STAT4  0x00000010  /* Indicate late collision occurred */

#define HPC3_ETXCTRL_STAT75 0x000000e0  /* Rdonly irq status from seeq */

#define HPC3_ETXCTRL_ENDIAN 0x00000100  /* DMA channel endian mode, 1=little 0=big */

#define HPC3_ETXCTRL_ACTIVE 0x00000200  /* DMA tx channel is active */

#define HPC3_ETXCTRL_AMASK  0x00000400  /* Indicates ACTIVE inhibits PIO's */

        volatile u32 tx_gfptr;          /* current GIO fifo ptr */

        volatile u32 tx_dfptr;          /* current device fifo ptr */

        u32 _unused4[0x1000/4 - 4];     /* padding */

};

struct hpc3_regs {

        /* First regs for the PBUS 8 dma channels. */

        struct hpc3_pbus_dmacregs pbdma[8];

        /* Now the HPC scsi registers, we get two scsi reg sets. */

        struct hpc3_scsiregs scsi_chan0, scsi_chan1;

        /* The SEEQ hpc3 ethernet dma/control registers. */

        struct hpc3_ethregs ethregs;

        /* Here are where the hpc3 fifo's can be directly accessed

         * via PIO accesses.  Under normal operation we never stick

         * our grubby paws in here so it's just padding. */

        u32 _unused0[0x18000/4];

        /* HPC3 irq status regs.  Due to a peculiar bug you need to

         * look at two different register addresses to get at all of

         * the status bits.  The first reg can only reliably report

         * bits 4:0 of the status, and the second reg can only

         * reliably report bits 9:5 of the hpc3 irq status.  I told

         * you it was a peculiar bug. ;-)

         */

        volatile u32 istat0;            /* Irq status, only bits <4:0> reliable. */

#define HPC3_ISTAT_PBIMASK      0x0ff   /* irq bits for pbus devs 0 --> 7 */

#define HPC3_ISTAT_SC0MASK      0x100   /* irq bit for scsi channel 0 */

#define HPC3_ISTAT_SC1MASK      0x200   /* irq bit for scsi channel 1 */

        volatile u32 gio_misc;          /* GIO misc control bits. */

#define HPC3_GIOMISC_ERTIME     0x1     /* Enable external timer real time. */

#define HPC3_GIOMISC_DENDIAN    0x2     /* dma descriptor endian, 1=lit 0=big */

        volatile u32 eeprom;            /* EEPROM data reg. */

#define HPC3_EEPROM_EPROT       0x01    /* Protect register enable */

#define HPC3_EEPROM_CSEL        0x02    /* Chip select */

#define HPC3_EEPROM_ECLK        0x04    /* EEPROM clock */

#define HPC3_EEPROM_DATO        0x08    /* Data out */

#define HPC3_EEPROM_DATI        0x10    /* Data in */

        volatile u32 istat1;            /* Irq status, only bits <9:5> reliable. */

        volatile u32 bestat;            /* Bus error interrupt status reg. */

#define HPC3_BESTAT_BLMASK      0x000ff /* Bus lane where bad parity occurred */

#define HPC3_BESTAT_CTYPE       0x00100 /* Bus cycle type, 0=PIO 1=DMA */

#define HPC3_BESTAT_PIDSHIFT    9

#define HPC3_BESTAT_PIDMASK     0x3f700 /* DMA channel parity identifier */

        u32 _unused1[0x14000/4 - 5];    /* padding */

        /* Now direct PIO per-HPC3 peripheral access to external regs. */

        volatile u32 scsi0_ext[256];    /* SCSI channel 0 external regs */

        u32 _unused2[0x7c00/4];

        volatile u32 scsi1_ext[256];    /* SCSI channel 1 external regs */

        u32 _unused3[0x7c00/4];

        volatile u32 eth_ext[320];      /* Ethernet external registers */

        u32 _unused4[0x3b00/4];

        /* Per-peripheral device external registers and DMA/PIO control. */

        volatile u32 pbus_extregs[16][256];

        volatile u32 pbus_dmacfg[8][128];

        /* Cycles to spend in D3 for reads */

#define HPC3_DMACFG_D3R_MASK            0x00000001

#define HPC3_DMACFG_D3R_SHIFT           0

        /* Cycles to spend in D4 for reads */

#define HPC3_DMACFG_D4R_MASK            0x0000001e

#define HPC3_DMACFG_D4R_SHIFT           1

        /* Cycles to spend in D5 for reads */

#define HPC3_DMACFG_D5R_MASK            0x000001e0

#define HPC3_DMACFG_D5R_SHIFT           5

        /* Cycles to spend in D3 for writes */

#define HPC3_DMACFG_D3W_MASK            0x00000200

#define HPC3_DMACFG_D3W_SHIFT           9

        /* Cycles to spend in D4 for writes */

#define HPC3_DMACFG_D4W_MASK            0x00003c00

#define HPC3_DMACFG_D4W_SHIFT           10

        /* Cycles to spend in D5 for writes */

#define HPC3_DMACFG_D5W_MASK            0x0003c000

#define HPC3_DMACFG_D5W_SHIFT           14

        /* Enable 16-bit DMA access mode */

#define HPC3_DMACFG_DS16                0x00040000

        /* Places halfwords on high 16 bits of bus */

#define HPC3_DMACFG_EVENHI              0x00080000

        /* Make this device real time */

#define HPC3_DMACFG_RTIME               0x00200000

        /* 5 bit burst count for DMA device */

#define HPC3_DMACFG_BURST_MASK          0x07c00000

#define HPC3_DMACFG_BURST_SHIFT 22

        /* Use live pbus_dreq unsynchronized signal */

#define HPC3_DMACFG_DRQLIVE             0x08000000

        volatile u32 pbus_piocfg[16][64];

        /* Cycles to spend in P2 state for reads */

#define HPC3_PIOCFG_P2R_MASK            0x00001

#define HPC3_PIOCFG_P2R_SHIFT           0

        /* Cycles to spend in P3 state for reads */

#define HPC3_PIOCFG_P3R_MASK            0x0001e

#define HPC3_PIOCFG_P3R_SHIFT           1

        /* Cycles to spend in P4 state for reads */

#define HPC3_PIOCFG_P4R_MASK            0x001e0

#define HPC3_PIOCFG_P4R_SHIFT           5

        /* Cycles to spend in P2 state for writes */

#define HPC3_PIOCFG_P2W_MASK            0x00200

#define HPC3_PIOCFG_P2W_SHIFT           9

        /* Cycles to spend in P3 state for writes */

#define HPC3_PIOCFG_P3W_MASK            0x03c00

#define HPC3_PIOCFG_P3W_SHIFT           10

        /* Cycles to spend in P4 state for writes */

#define HPC3_PIOCFG_P4W_MASK            0x3c000

#define HPC3_PIOCFG_P4W_SHIFT           14

        /* Enable 16-bit PIO accesses */

#define HPC3_PIOCFG_DS16                0x40000

        /* Place even address bits in bits <15:8> */

#define HPC3_PIOCFG_EVENHI              0x80000

        /* PBUS PROM control regs. */

        volatile u32 pbus_promwe;       /* PROM write enable register */

#define HPC3_PROM_WENAB 0x1     /* Enable writes to the PROM */

        u32 _unused5[0x0800/4 - 1];

        volatile u32 pbus_promswap;     /* Chip select swap reg */

#define HPC3_PROM_SWAP  0x1     /* invert GIO addr bit to select prom0 or prom1 */

        u32 _unused6[0x0800/4 - 1];

        volatile u32 pbus_gout; /* PROM general purpose output reg */

#define HPC3_PROM_STAT  0x1     /* General purpose status bit in gout */

        u32 _unused7[0x1000/4 - 1];

        volatile u32 rtcregs[14];       /* Dallas clock registers */

        u32 _unused8[50];

        volatile u32 bbram[8192-50-14]; /* Battery backed ram */

};

/*

 * It is possible to have two HPC3's within the address space on

 * one machine, though only having one is more likely on an Indy.

 */

extern struct hpc3_regs *hpc3c0, *hpc3c1;

#define HPC3_CHIP0_BASE         0x1fb80000      /* physical */

#define HPC3_CHIP1_BASE         0x1fb00000      /* physical */

extern void sgihpc_init(void);

#endif /* _SGI_HPC3_H */