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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 * performance 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/interrupt.h>
78#include <linux/delay.h>
79#include <linux/netdevice.h>
80#include <linux/etherdevice.h>
81#include <linux/skbuff.h>
82#include <linux/types.h>
83#include <linux/bitops.h>
84#include <linux/dma-mapping.h>
85
86#include <asm/io.h>
87#include <asm/irq.h>
88#include <asm/pdc.h>
89#include <asm/parisc-device.h>
90
91#define LASI_82596_DRIVER_VERSION "LASI 82596 driver - Revision: 1.30"
92
93#define PA_I82596_RESET 0 /* Offsets relative to LASI-LAN-Addr.*/
94#define PA_CPU_PORT_L_ACCESS 4
95#define PA_CHANNEL_ATTENTION 8
96
97#define OPT_SWAP_PORT 0x0001 /* Need to wordswp on the MPU port */
98
99#define DMA_WBACK(ndev, addr, len) \
100 do { dma_cache_sync((ndev)->dev.parent, (void *)addr, len, DMA_TO_DEVICE); } while (0)
101
102#define DMA_INV(ndev, addr, len) \
103 do { dma_cache_sync((ndev)->dev.parent, (void *)addr, len, DMA_FROM_DEVICE); } while (0)
104
105#define DMA_WBACK_INV(ndev, addr, len) \
106 do { dma_cache_sync((ndev)->dev.parent, (void *)addr, len, DMA_BIDIRECTIONAL); } while (0)
107
108#define SYSBUS 0x0000006c;
109
110/* big endian CPU, 82596 "big" endian mode */
111#define SWAP32(x) (((u32)(x)<<16) | ((((u32)(x)))>>16))
112#define SWAP16(x) (x)
113
114#include "lib82596.c"
115
116MODULE_AUTHOR("Richard Hirst");
117MODULE_DESCRIPTION("i82596 driver");
118MODULE_LICENSE("GPL");
119module_param(i596_debug, int, 0);
120MODULE_PARM_DESC(i596_debug, "lasi_82596 debug mask");
121
122static inline void ca(struct net_device *dev)
123{
124 gsc_writel(0, dev->base_addr + PA_CHANNEL_ATTENTION);
125}
126
127
128static void mpu_port(struct net_device *dev, int c, dma_addr_t x)
129{
130 struct i596_private *lp = netdev_priv(dev);
131
132 u32 v = (u32) (c) | (u32) (x);
133 u16 a, b;
134
135 if (lp->options & OPT_SWAP_PORT) {
136 a = v >> 16;
137 b = v & 0xffff;
138 } else {
139 a = v & 0xffff;
140 b = v >> 16;
141 }
142
143 gsc_writel(a, dev->base_addr + PA_CPU_PORT_L_ACCESS);
144 udelay(1);
145 gsc_writel(b, dev->base_addr + PA_CPU_PORT_L_ACCESS);
146}
147
148#define LAN_PROM_ADDR 0xF0810000
149
150static int __init
151lan_init_chip(struct parisc_device *dev)
152{
153 struct net_device *netdevice;
154 struct i596_private *lp;
155 int retval;
156 int i;
157
158 if (!dev->irq) {
159 printk(KERN_ERR "%s: IRQ not found for i82596 at 0x%lx\n",
160 __FILE__, (unsigned long)dev->hpa.start);
161 return -ENODEV;
162 }
163
164 printk(KERN_INFO "Found i82596 at 0x%lx, IRQ %d\n",
165 (unsigned long)dev->hpa.start, dev->irq);
166
167 netdevice = alloc_etherdev(sizeof(struct i596_private));
168 if (!netdevice)
169 return -ENOMEM;
170 SET_NETDEV_DEV(netdevice, &dev->dev);
171 parisc_set_drvdata (dev, netdevice);
172
173 netdevice->base_addr = dev->hpa.start;
174 netdevice->irq = dev->irq;
175
176 if (pdc_lan_station_id(netdevice->dev_addr, netdevice->base_addr)) {
177 for (i = 0; i < 6; i++) {
178 netdevice->dev_addr[i] = gsc_readb(LAN_PROM_ADDR + i);
179 }
180 printk(KERN_INFO
181 "%s: MAC of HP700 LAN read from EEPROM\n", __FILE__);
182 }
183
184 lp = netdev_priv(netdevice);
185 lp->options = dev->id.sversion == 0x72 ? OPT_SWAP_PORT : 0;
186
187 retval = i82596_probe(netdevice);
188 if (retval) {
189 free_netdev(netdevice);
190 return -ENODEV;
191 }
192 return retval;
193}
194
195static int __exit lan_remove_chip(struct parisc_device *pdev)
196{
197 struct net_device *dev = parisc_get_drvdata(pdev);
198 struct i596_private *lp = netdev_priv(dev);
199
200 unregister_netdev (dev);
201 dma_free_attrs(&pdev->dev, sizeof(struct i596_private), lp->dma,
202 lp->dma_addr, DMA_ATTR_NON_CONSISTENT);
203 free_netdev (dev);
204 return 0;
205}
206
207static const struct parisc_device_id lan_tbl[] __initconst = {
208 { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x0008a },
209 { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00072 },
210 { 0, }
211};
212
213MODULE_DEVICE_TABLE(parisc, lan_tbl);
214
215static struct parisc_driver lan_driver __refdata = {
216 .name = "lasi_82596",
217 .id_table = lan_tbl,
218 .probe = lan_init_chip,
219 .remove = __exit_p(lan_remove_chip),
220};
221
222static int lasi_82596_init(void)
223{
224 printk(KERN_INFO LASI_82596_DRIVER_VERSION "\n");
225 return register_parisc_driver(&lan_driver);
226}
227
228module_init(lasi_82596_init);
229
230static void __exit lasi_82596_exit(void)
231{
232 unregister_parisc_driver(&lan_driver);
233}
234
235module_exit(lasi_82596_exit);