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/init.h>
83 #include <linux/types.h>
84 #include <linux/bitops.h>
85 #include <linux/dma-mapping.h>
86
87 #include <asm/io.h>
88 #include <asm/irq.h>
89 #include <asm/pdc.h>
90 #include <asm/parisc-device.h>
91
92 #define LASI_82596_DRIVER_VERSION "LASI 82596 driver - Revision: 1.30"
93
94 #define PA_I82596_RESET 0 /* Offsets relative to LASI-LAN-Addr.*/
95 #define PA_CPU_PORT_L_ACCESS 4
96 #define PA_CHANNEL_ATTENTION 8
97
98 #define OPT_SWAP_PORT 0x0001 /* Need to wordswp on the MPU port */
99
100 #define DMA_ALLOC dma_alloc_noncoherent
101 #define DMA_FREE dma_free_noncoherent
102 #define DMA_WBACK(ndev, addr, len) \
103 do { dma_cache_sync((ndev)->dev.parent, (void *)addr, len, DMA_TO_DEVICE); } while (0)
104
105 #define DMA_INV(ndev, addr, len) \
106 do { dma_cache_sync((ndev)->dev.parent, (void *)addr, len, DMA_FROM_DEVICE); } while (0)
107
108 #define DMA_WBACK_INV(ndev, addr, len) \
109 do { dma_cache_sync((ndev)->dev.parent, (void *)addr, len, DMA_BIDIRECTIONAL); } while (0)
110
111 #define SYSBUS 0x0000006c;
112
113 /* big endian CPU, 82596 "big" endian mode */
114 #define SWAP32(x) (((u32)(x)<<16) | ((((u32)(x)))>>16))
115 #define SWAP16(x) (x)
116
117 #include "lib82596.c"
118
119 MODULE_AUTHOR("Richard Hirst");
120 MODULE_DESCRIPTION("i82596 driver");
121 MODULE_LICENSE("GPL");
122 module_param(i596_debug, int, 0);
123 MODULE_PARM_DESC(i596_debug, "lasi_82596 debug mask");
124
ca(struct net_device * dev)125 static inline void ca(struct net_device *dev)
126 {
127 gsc_writel(0, dev->base_addr + PA_CHANNEL_ATTENTION);
128 }
129
130
mpu_port(struct net_device * dev,int c,dma_addr_t x)131 static void mpu_port(struct net_device *dev, int c, dma_addr_t x)
132 {
133 struct i596_private *lp = netdev_priv(dev);
134
135 u32 v = (u32) (c) | (u32) (x);
136 u16 a, b;
137
138 if (lp->options & OPT_SWAP_PORT) {
139 a = v >> 16;
140 b = v & 0xffff;
141 } else {
142 a = v & 0xffff;
143 b = v >> 16;
144 }
145
146 gsc_writel(a, dev->base_addr + PA_CPU_PORT_L_ACCESS);
147 udelay(1);
148 gsc_writel(b, dev->base_addr + PA_CPU_PORT_L_ACCESS);
149 }
150
151 #define LAN_PROM_ADDR 0xF0810000
152
153 static int __devinit
lan_init_chip(struct parisc_device * dev)154 lan_init_chip(struct parisc_device *dev)
155 {
156 struct net_device *netdevice;
157 struct i596_private *lp;
158 int retval;
159 int i;
160
161 if (!dev->irq) {
162 printk(KERN_ERR "%s: IRQ not found for i82596 at 0x%lx\n",
163 __FILE__, (unsigned long)dev->hpa.start);
164 return -ENODEV;
165 }
166
167 printk(KERN_INFO "Found i82596 at 0x%lx, IRQ %d\n",
168 (unsigned long)dev->hpa.start, dev->irq);
169
170 netdevice = alloc_etherdev(sizeof(struct i596_private));
171 if (!netdevice)
172 return -ENOMEM;
173 SET_NETDEV_DEV(netdevice, &dev->dev);
174 parisc_set_drvdata (dev, netdevice);
175
176 netdevice->base_addr = dev->hpa.start;
177 netdevice->irq = dev->irq;
178
179 if (pdc_lan_station_id(netdevice->dev_addr, netdevice->base_addr)) {
180 for (i = 0; i < 6; i++) {
181 netdevice->dev_addr[i] = gsc_readb(LAN_PROM_ADDR + i);
182 }
183 printk(KERN_INFO
184 "%s: MAC of HP700 LAN read from EEPROM\n", __FILE__);
185 }
186
187 lp = netdev_priv(netdevice);
188 lp->options = dev->id.sversion == 0x72 ? OPT_SWAP_PORT : 0;
189
190 retval = i82596_probe(netdevice);
191 if (retval) {
192 free_netdev(netdevice);
193 return -ENODEV;
194 }
195 return retval;
196 }
197
lan_remove_chip(struct parisc_device * pdev)198 static int __devexit lan_remove_chip (struct parisc_device *pdev)
199 {
200 struct net_device *dev = parisc_get_drvdata(pdev);
201 struct i596_private *lp = netdev_priv(dev);
202
203 unregister_netdev (dev);
204 DMA_FREE(&pdev->dev, sizeof(struct i596_private),
205 (void *)lp->dma, lp->dma_addr);
206 free_netdev (dev);
207 return 0;
208 }
209
210 static struct parisc_device_id lan_tbl[] = {
211 { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x0008a },
212 { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00072 },
213 { 0, }
214 };
215
216 MODULE_DEVICE_TABLE(parisc, lan_tbl);
217
218 static struct parisc_driver lan_driver = {
219 .name = "lasi_82596",
220 .id_table = lan_tbl,
221 .probe = lan_init_chip,
222 .remove = __devexit_p(lan_remove_chip),
223 };
224
lasi_82596_init(void)225 static int __devinit lasi_82596_init(void)
226 {
227 printk(KERN_INFO LASI_82596_DRIVER_VERSION "\n");
228 return register_parisc_driver(&lan_driver);
229 }
230
231 module_init(lasi_82596_init);
232
lasi_82596_exit(void)233 static void __exit lasi_82596_exit(void)
234 {
235 unregister_parisc_driver(&lan_driver);
236 }
237
238 module_exit(lasi_82596_exit);
239