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