1 /* lasi_82596.c -- driver for the intel 82596 ethernet controller, as
2 munged into HPPA boxen .
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.
8 3 primary sources of the mess --
9 1) hppa needs *lots* of cacheline flushing to keep this kind of
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*.
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.
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.
23 Split 02/13/2000 Sam Creasey (sammy@oh.verio.com)
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)
29 /* 82596.c: A generic 82596 ethernet driver for linux. */
32 Written 1994 by Mark Evans.
33 This driver is for the Apricot 82596 bus-master interface
35 Modularised 12/94 Mark Evans
38 Modified to support the 82596 ethernet chips on 680x0 VME boards.
39 by Richard Hirst <richard@sleepie.demon.co.uk>
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.
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
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
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.
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
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>
91 #include <asm/parisc-device.h>
93 #define LASI_82596_DRIVER_VERSION "LASI 82596 driver - Revision: 1.30"
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
99 #define OPT_SWAP_PORT 0x0001 /* Need to wordswp on the MPU port */
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)
106 #define DMA_INV(ndev, addr, len) \
107 do { dma_cache_sync((ndev)->dev.parent, (void *)addr, len, DMA_FROM_DEVICE); } while (0)
109 #define DMA_WBACK_INV(ndev, addr, len) \
110 do { dma_cache_sync((ndev)->dev.parent, (void *)addr, len, DMA_BIDIRECTIONAL); } while (0)
112 #define SYSBUS 0x0000006c;
114 /* big endian CPU, 82596 "big" endian mode */
115 #define SWAP32(x) (((u32)(x)<<16) | ((((u32)(x)))>>16))
116 #define SWAP16(x) (x)
118 #include "lib82596.c"
120 MODULE_AUTHOR("Richard Hirst");
121 MODULE_DESCRIPTION("i82596 driver");
122 MODULE_LICENSE("GPL");
123 module_param(i596_debug, int, 0);
124 MODULE_PARM_DESC(i596_debug, "lasi_82596 debug mask");
126 static inline void ca(struct net_device *dev)
128 gsc_writel(0, dev->base_addr + PA_CHANNEL_ATTENTION);
132 static void mpu_port(struct net_device *dev, int c, dma_addr_t x)
134 struct i596_private *lp = netdev_priv(dev);
136 u32 v = (u32) (c) | (u32) (x);
139 if (lp->options & OPT_SWAP_PORT) {
147 gsc_writel(a, dev->base_addr + PA_CPU_PORT_L_ACCESS);
149 gsc_writel(b, dev->base_addr + PA_CPU_PORT_L_ACCESS);
152 #define LAN_PROM_ADDR 0xF0810000
155 lan_init_chip(struct parisc_device *dev)
157 struct net_device *netdevice;
158 struct i596_private *lp;
163 printk(KERN_ERR "%s: IRQ not found for i82596 at 0x%lx\n",
164 __FILE__, dev->hpa.start);
168 printk(KERN_INFO "Found i82596 at 0x%lx, IRQ %d\n", dev->hpa.start,
171 netdevice = alloc_etherdev(sizeof(struct i596_private));
174 SET_NETDEV_DEV(netdevice, &dev->dev);
175 parisc_set_drvdata (dev, netdevice);
177 netdevice->base_addr = dev->hpa.start;
178 netdevice->irq = dev->irq;
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);
185 "%s: MAC of HP700 LAN read from EEPROM\n", __FILE__);
188 lp = netdev_priv(netdevice);
189 lp->options = dev->id.sversion == 0x72 ? OPT_SWAP_PORT : 0;
191 retval = i82596_probe(netdevice);
193 free_netdev(netdevice);
199 static int __devexit lan_remove_chip (struct parisc_device *pdev)
201 struct net_device *dev = parisc_get_drvdata(pdev);
202 struct i596_private *lp = netdev_priv(dev);
204 unregister_netdev (dev);
205 DMA_FREE(&pdev->dev, sizeof(struct i596_private),
206 (void *)lp->dma, lp->dma_addr);
211 static 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 },
217 MODULE_DEVICE_TABLE(parisc, lan_tbl);
219 static struct parisc_driver lan_driver = {
220 .name = "lasi_82596",
222 .probe = lan_init_chip,
223 .remove = __devexit_p(lan_remove_chip),
226 static int __devinit lasi_82596_init(void)
228 printk(KERN_INFO LASI_82596_DRIVER_VERSION "\n");
229 return register_parisc_driver(&lan_driver);
232 module_init(lasi_82596_init);
234 static void __exit lasi_82596_exit(void)
236 unregister_parisc_driver(&lan_driver);
239 module_exit(lasi_82596_exit);