drivers/atm/eni.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /* drivers/atm/eni.h - Efficient Networks ENI155P device driver declarations */
   3
   4 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
   5
   6
   7 #ifndef DRIVER_ATM_ENI_H
   8 #define DRIVER_ATM_ENI_H
   9
  10 #include <linux/atm.h>
  11 #include <linux/atmdev.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/sonet.h>
  14 #include <linux/skbuff.h>
  15 #include <linux/time.h>
  16 #include <linux/pci.h>
  17 #include <linux/spinlock.h>
  18 #include <linux/atomic.h>
  19
  20 #include "midway.h"
  21
  22
  23 #define DEV_LABEL       "eni"
  24
  25 #define UBR_BUFFER      (128*1024)      /* UBR buffer size */
  26
  27 #define RX_DMA_BUF        8             /* burst and skip a few things */
  28 #define TX_DMA_BUF      100             /* should be enough for 64 kB */
  29
  30 #define DEFAULT_RX_MULT 300             /* max_sdu*3 */
  31 #define DEFAULT_TX_MULT 300             /* max_sdu*3 */
  32
  33 #define ENI_ZEROES_SIZE   4             /* need that many DMA-able zero bytes */
  34
  35
  36 struct eni_free {
  37         void __iomem *start;            /* counting in bytes */
  38         int order;
  39 };
  40
  41 struct eni_tx {
  42         void __iomem *send;             /* base, 0 if unused */
  43         int prescaler;                  /* shaping prescaler */
  44         int resolution;                 /* shaping divider */
  45         unsigned long tx_pos;           /* current TX write position */
  46         unsigned long words;            /* size of TX queue */
  47         int index;                      /* TX channel number */
  48         int reserved;                   /* reserved peak cell rate */
  49         int shaping;                    /* shaped peak cell rate */
  50         struct sk_buff_head backlog;    /* queue of waiting TX buffers */
  51 };
  52
  53 struct eni_vcc {
  54         int (*rx)(struct atm_vcc *vcc); /* RX function, NULL if none */
  55         void __iomem *recv;             /* receive buffer */
  56         unsigned long words;            /* its size in words */
  57         unsigned long descr;            /* next descriptor (RX) */
  58         unsigned long rx_pos;           /* current RX descriptor pos */
  59         struct eni_tx *tx;              /* TXer, NULL if none */
  60         int rxing;                      /* number of pending PDUs */
  61         int servicing;                  /* number of waiting VCs (0 or 1) */
  62         int txing;                      /* number of pending TX bytes */
  63         ktime_t timestamp;              /* for RX timing */
  64         struct atm_vcc *next;           /* next pending RX */
  65         struct sk_buff *last;           /* last PDU being DMAed (used to carry
  66                                            discard information) */
  67 };
  68
  69 struct eni_dev {
  70         /*-------------------------------- spinlock */
  71         spinlock_t lock;                /* sync with interrupt */
  72         struct tasklet_struct task;     /* tasklet for interrupt work */
  73         u32 events;                     /* pending events */
  74         /*-------------------------------- base pointers into Midway address
  75                                            space */
  76         void __iomem *ioaddr;
  77         void __iomem *phy;              /* PHY interface chip registers */
  78         void __iomem *reg;              /* register base */
  79         void __iomem *ram;              /* RAM base */
  80         void __iomem *vci;              /* VCI table */
  81         void __iomem *rx_dma;           /* RX DMA queue */
  82         void __iomem *tx_dma;           /* TX DMA queue */
  83         void __iomem *service;          /* service list */
  84         /*-------------------------------- TX part */
  85         struct eni_tx tx[NR_CHAN];      /* TX channels */
  86         struct eni_tx *ubr;             /* UBR channel */
  87         struct sk_buff_head tx_queue;   /* PDUs currently being TX DMAed*/
  88         wait_queue_head_t tx_wait;      /* for close */
  89         int tx_bw;                      /* remaining bandwidth */
  90         u32 dma[TX_DMA_BUF*2];          /* DMA request scratch area */
  91         struct eni_zero {               /* aligned "magic" zeroes */
  92                 u32 *addr;
  93                 dma_addr_t dma;
  94         } zero;
  95         int tx_mult;                    /* buffer size multiplier (percent) */
  96         /*-------------------------------- RX part */
  97         u32 serv_read;                  /* host service read index */
  98         struct atm_vcc *fast,*last_fast;/* queues of VCCs with pending PDUs */
  99         struct atm_vcc *slow,*last_slow;
 100         struct atm_vcc **rx_map;        /* for fast lookups */
 101         struct sk_buff_head rx_queue;   /* PDUs currently being RX-DMAed */
 102         wait_queue_head_t rx_wait;      /* for close */
 103         int rx_mult;                    /* buffer size multiplier (percent) */
 104         /*-------------------------------- statistics */
 105         unsigned long lost;             /* number of lost cells (RX) */
 106         /*-------------------------------- memory management */
 107         unsigned long base_diff;        /* virtual-real base address */
 108         int free_len;                   /* free list length */
 109         struct eni_free *free_list;     /* free list */
 110         int free_list_size;             /* maximum size of free list */
 111         /*-------------------------------- ENI links */
 112         struct atm_dev *more;           /* other ENI devices */
 113         /*-------------------------------- general information */
 114         int mem;                        /* RAM on board (in bytes) */
 115         int asic;                       /* PCI interface type, 0 for FPGA */
 116         unsigned int irq;               /* IRQ */
 117         struct pci_dev *pci_dev;        /* PCI stuff */
 118 };
 119
 120
 121 #define ENI_DEV(d) ((struct eni_dev *) (d)->dev_data)
 122 #define ENI_VCC(d) ((struct eni_vcc *) (d)->dev_data)
 123
 124
 125 struct eni_skb_prv {
 126         struct atm_skb_data _;          /* reserved */
 127         unsigned long pos;              /* position of next descriptor */
 128         int size;                       /* PDU size in reassembly buffer */
 129         dma_addr_t paddr;               /* DMA handle */
 130 };
 131
 132 #define ENI_PRV_SIZE(skb) (((struct eni_skb_prv *) (skb)->cb)->size)
 133 #define ENI_PRV_POS(skb) (((struct eni_skb_prv *) (skb)->cb)->pos)
 134 #define ENI_PRV_PADDR(skb) (((struct eni_skb_prv *) (skb)->cb)->paddr)
 135
 136 #endif