Root/drivers/net/lasi_82596.c

1/* lasi_82596.c -- driver for the intel 82596 ethernet controller, as
2   munged into HPPA boxen .
3
4   This driver is based upon 82596.c, original credits are below...
5   but there were too many hoops which HP wants jumped through to
6   keep this code in there in a sane manner.
7
8   3 primary sources of the mess --
9   1) hppa needs *lots* of cacheline flushing to keep this kind of
10   MMIO running.
11
12   2) The 82596 needs to see all of its pointers as their physical
13   address. Thus virt_to_bus/bus_to_virt are *everywhere*.
14
15   3) The implementation HP is using seems to be significantly pickier
16   about when and how the command and RX units are started. some
17   command ordering was changed.
18
19   Examination of the mach driver leads one to believe that there
20   might be a saner way to pull this off... anyone who feels like a
21   full rewrite can be my guest.
22
23   Split 02/13/2000 Sam Creasey (sammy@oh.verio.com)
24
25   02/01/2000 Initial modifications for parisc by Helge Deller (deller@gmx.de)
26   03/02/2000 changes for better/correct(?) cache-flushing (deller)
27*/
28
29/* 82596.c: A generic 82596 ethernet driver for linux. */
30/*
31   Based on Apricot.c
32   Written 1994 by Mark Evans.
33   This driver is for the Apricot 82596 bus-master interface
34
35   Modularised 12/94 Mark Evans
36
37
38   Modified to support the 82596 ethernet chips on 680x0 VME boards.
39   by Richard Hirst <richard@sleepie.demon.co.uk>
40   Renamed to be 82596.c
41
42   980825: Changed to receive directly in to sk_buffs which are
43   allocated at open() time. Eliminates copy on incoming frames
44   (small ones are still copied). Shared data now held in a
45   non-cached page, so we can run on 68060 in copyback mode.
46
47   TBD:
48   * look at deferring rx frames rather than discarding (as per tulip)
49   * handle tx ring full as per tulip
50   * performace test to tune rx_copybreak
51
52   Most of my modifications relate to the braindead big-endian
53   implementation by Intel. When the i596 is operating in
54   'big-endian' mode, it thinks a 32 bit value of 0x12345678
55   should be stored as 0x56781234. This is a real pain, when
56   you have linked lists which are shared by the 680x0 and the
57   i596.
58
59   Driver skeleton
60   Written 1993 by Donald Becker.
61   Copyright 1993 United States Government as represented by the Director,
62   National Security Agency. This software may only be used and distributed
63   according to the terms of the GNU General Public License as modified by SRC,
64   incorporated herein by reference.
65
66   The author may be reached as becker@scyld.com, or C/O
67   Scyld Computing Corporation, 410 Severn Ave., Suite 210, Annapolis MD 21403
68
69 */
70
71#include <linux/module.h>
72#include <linux/kernel.h>
73#include <linux/string.h>
74#include <linux/ptrace.h>
75#include <linux/errno.h>
76#include <linux/ioport.h>
77#include <linux/slab.h>
78#include <linux/interrupt.h>
79#include <linux/delay.h>
80#include <linux/netdevice.h>
81#include <linux/etherdevice.h>
82#include <linux/skbuff.h>
83#include <linux/init.h>
84#include <linux/types.h>
85#include <linux/bitops.h>
86#include <linux/dma-mapping.h>
87
88#include <asm/io.h>
89#include <asm/irq.h>
90#include <asm/pdc.h>
91#include <asm/parisc-device.h>
92
93#define LASI_82596_DRIVER_VERSION "LASI 82596 driver - Revision: 1.30"
94
95#define PA_I82596_RESET 0 /* Offsets relative to LASI-LAN-Addr.*/
96#define PA_CPU_PORT_L_ACCESS 4
97#define PA_CHANNEL_ATTENTION 8
98
99#define OPT_SWAP_PORT 0x0001 /* Need to wordswp on the MPU port */
100
101#define DMA_ALLOC dma_alloc_noncoherent
102#define DMA_FREE dma_free_noncoherent
103#define DMA_WBACK(ndev, addr, len) \
104    do { dma_cache_sync((ndev)->dev.parent, (void *)addr, len, DMA_TO_DEVICE); } while (0)
105
106#define DMA_INV(ndev, addr, len) \
107    do { dma_cache_sync((ndev)->dev.parent, (void *)addr, len, DMA_FROM_DEVICE); } while (0)
108
109#define DMA_WBACK_INV(ndev, addr, len) \
110    do { dma_cache_sync((ndev)->dev.parent, (void *)addr, len, DMA_BIDIRECTIONAL); } while (0)
111
112#define SYSBUS 0x0000006c;
113
114/* big endian CPU, 82596 "big" endian mode */
115#define SWAP32(x) (((u32)(x)<<16) | ((((u32)(x)))>>16))
116#define SWAP16(x) (x)
117
118#include "lib82596.c"
119
120MODULE_AUTHOR("Richard Hirst");
121MODULE_DESCRIPTION("i82596 driver");
122MODULE_LICENSE("GPL");
123module_param(i596_debug, int, 0);
124MODULE_PARM_DESC(i596_debug, "lasi_82596 debug mask");
125
126static inline void ca(struct net_device *dev)
127{
128    gsc_writel(0, dev->base_addr + PA_CHANNEL_ATTENTION);
129}
130
131
132static void mpu_port(struct net_device *dev, int c, dma_addr_t x)
133{
134    struct i596_private *lp = netdev_priv(dev);
135
136    u32 v = (u32) (c) | (u32) (x);
137    u16 a, b;
138
139    if (lp->options & OPT_SWAP_PORT) {
140        a = v >> 16;
141        b = v & 0xffff;
142    } else {
143        a = v & 0xffff;
144        b = v >> 16;
145    }
146
147    gsc_writel(a, dev->base_addr + PA_CPU_PORT_L_ACCESS);
148    udelay(1);
149    gsc_writel(b, dev->base_addr + PA_CPU_PORT_L_ACCESS);
150}
151
152#define LAN_PROM_ADDR 0xF0810000
153
154static int __devinit
155lan_init_chip(struct parisc_device *dev)
156{
157    struct net_device *netdevice;
158    struct i596_private *lp;
159    int retval;
160    int i;
161
162    if (!dev->irq) {
163        printk(KERN_ERR "%s: IRQ not found for i82596 at 0x%lx\n",
164            __FILE__, (unsigned long)dev->hpa.start);
165        return -ENODEV;
166    }
167
168    printk(KERN_INFO "Found i82596 at 0x%lx, IRQ %d\n",
169            (unsigned long)dev->hpa.start, dev->irq);
170
171    netdevice = alloc_etherdev(sizeof(struct i596_private));
172    if (!netdevice)
173        return -ENOMEM;
174    SET_NETDEV_DEV(netdevice, &dev->dev);
175    parisc_set_drvdata (dev, netdevice);
176
177    netdevice->base_addr = dev->hpa.start;
178    netdevice->irq = dev->irq;
179
180    if (pdc_lan_station_id(netdevice->dev_addr, netdevice->base_addr)) {
181        for (i = 0; i < 6; i++) {
182            netdevice->dev_addr[i] = gsc_readb(LAN_PROM_ADDR + i);
183        }
184        printk(KERN_INFO
185               "%s: MAC of HP700 LAN read from EEPROM\n", __FILE__);
186    }
187
188    lp = netdev_priv(netdevice);
189    lp->options = dev->id.sversion == 0x72 ? OPT_SWAP_PORT : 0;
190
191    retval = i82596_probe(netdevice);
192    if (retval) {
193        free_netdev(netdevice);
194        return -ENODEV;
195    }
196    return retval;
197}
198
199static int __devexit lan_remove_chip (struct parisc_device *pdev)
200{
201    struct net_device *dev = parisc_get_drvdata(pdev);
202    struct i596_private *lp = netdev_priv(dev);
203
204    unregister_netdev (dev);
205    DMA_FREE(&pdev->dev, sizeof(struct i596_private),
206         (void *)lp->dma, lp->dma_addr);
207    free_netdev (dev);
208    return 0;
209}
210
211static struct parisc_device_id lan_tbl[] = {
212    { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x0008a },
213    { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00072 },
214    { 0, }
215};
216
217MODULE_DEVICE_TABLE(parisc, lan_tbl);
218
219static struct parisc_driver lan_driver = {
220    .name = "lasi_82596",
221    .id_table = lan_tbl,
222    .probe = lan_init_chip,
223    .remove = __devexit_p(lan_remove_chip),
224};
225
226static int __devinit lasi_82596_init(void)
227{
228    printk(KERN_INFO LASI_82596_DRIVER_VERSION "\n");
229    return register_parisc_driver(&lan_driver);
230}
231
232module_init(lasi_82596_init);
233
234static void __exit lasi_82596_exit(void)
235{
236    unregister_parisc_driver(&lan_driver);
237}
238
239module_exit(lasi_82596_exit);
240

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