1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* drivers/atm/zatm.h - ZeitNet ZN122x device driver declarations */
3
4 /* Written 1995-1998 by Werner Almesberger, EPFL LRC/ICA */
5
6
7 #ifndef DRIVER_ATM_ZATM_H
8 #define DRIVER_ATM_ZATM_H
9
10 #include <linux/skbuff.h>
11 #include <linux/atm.h>
12 #include <linux/atmdev.h>
13 #include <linux/sonet.h>
14 #include <linux/pci.h>
15
16
17 #define DEV_LABEL "zatm"
18
19 #define MAX_AAL5_PDU 10240 /* allocate for AAL5 PDUs of this size */
20 #define MAX_RX_SIZE_LD 14 /* ceil(log2((MAX_AAL5_PDU+47)/48)) */
21
22 #define LOW_MARK 12 /* start adding new buffers if less than 12 */
23 #define HIGH_MARK 30 /* stop adding buffers after reaching 30 */
24 #define OFF_CNG_THRES 5 /* threshold for offset changes */
25
26 #define RX_SIZE 2 /* RX lookup entry size (in bytes) */
27 #define NR_POOLS 32 /* number of free buffer pointers */
28 #define POOL_SIZE 8 /* buffer entry size (in bytes) */
29 #define NR_SHAPERS 16 /* number of shapers */
30 #define SHAPER_SIZE 4 /* shaper entry size (in bytes) */
31 #define VC_SIZE 32 /* VC dsc (TX or RX) size (in bytes) */
32
33 #define RING_ENTRIES 32 /* ring entries (without back pointer) */
34 #define RING_WORDS 4 /* ring element size */
35 #define RING_SIZE (sizeof(unsigned long)*(RING_ENTRIES+1)*RING_WORDS)
36
37 #define NR_MBX 4 /* four mailboxes */
38 #define MBX_RX_0 0 /* mailbox indices */
39 #define MBX_RX_1 1
40 #define MBX_TX_0 2
41 #define MBX_TX_1 3
42
43 struct zatm_vcc {
44 /*-------------------------------- RX part */
45 int rx_chan; /* RX channel, 0 if none */
46 int pool; /* free buffer pool */
47 /*-------------------------------- TX part */
48 int tx_chan; /* TX channel, 0 if none */
49 int shaper; /* shaper, <0 if none */
50 struct sk_buff_head tx_queue; /* list of buffers in transit */
51 wait_queue_head_t tx_wait; /* for close */
52 u32 *ring; /* transmit ring */
53 int ring_curr; /* current write position */
54 int txing; /* number of transmits in progress */
55 struct sk_buff_head backlog; /* list of buffers waiting for ring */
56 };
57
58 struct zatm_dev {
59 /*-------------------------------- TX part */
60 int tx_bw; /* remaining bandwidth */
61 u32 free_shapers; /* bit set */
62 int ubr; /* UBR shaper; -1 if none */
63 int ubr_ref_cnt; /* number of VCs using UBR shaper */
64 /*-------------------------------- RX part */
65 int pool_ref[NR_POOLS]; /* free buffer pool usage counters */
66 volatile struct sk_buff *last_free[NR_POOLS];
67 /* last entry in respective pool */
68 struct sk_buff_head pool[NR_POOLS];/* free buffer pools */
69 struct zatm_pool_info pool_info[NR_POOLS]; /* pool information */
70 /*-------------------------------- maps */
71 struct atm_vcc **tx_map; /* TX VCCs */
72 struct atm_vcc **rx_map; /* RX VCCs */
73 int chans; /* map size, must be 2^n */
74 /*-------------------------------- mailboxes */
75 unsigned long mbx_start[NR_MBX];/* start addresses */
76 dma_addr_t mbx_dma[NR_MBX];
77 u16 mbx_end[NR_MBX]; /* end offset (in bytes) */
78 /*-------------------------------- other pointers */
79 u32 pool_base; /* Free buffer pool dsc (word addr) */
80 /*-------------------------------- ZATM links */
81 struct atm_dev *more; /* other ZATM devices */
82 /*-------------------------------- general information */
83 int mem; /* RAM on board (in bytes) */
84 int khz; /* timer clock */
85 int copper; /* PHY type */
86 unsigned char irq; /* IRQ */
87 unsigned int base; /* IO base address */
88 struct pci_dev *pci_dev; /* PCI stuff */
89 spinlock_t lock;
90 };
91
92
93 #define ZATM_DEV(d) ((struct zatm_dev *) (d)->dev_data)
94 #define ZATM_VCC(d) ((struct zatm_vcc *) (d)->dev_data)
95
96
97 struct zatm_skb_prv {
98 struct atm_skb_data _; /* reserved */
99 u32 *dsc; /* pointer to skb's descriptor */
100 };
101
102 #define ZATM_PRV_DSC(skb) (((struct zatm_skb_prv *) (skb)->cb)->dsc)
103
104 #endif