xref: /linux/drivers/atm/eni.h (revision 498495dba268b20e8eadd7fe93c140c68b6cc9d2)
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
137