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 
116 MODULE_AUTHOR("Richard Hirst");
117 MODULE_DESCRIPTION("i82596 driver");
118 MODULE_LICENSE("GPL");
119 module_param(i596_debug, int, 0);
120 MODULE_PARM_DESC(i596_debug, "lasi_82596 debug mask");
121 
122 static inline void ca(struct net_device *dev)
123 {
124 	gsc_writel(0, dev->base_addr + PA_CHANNEL_ATTENTION);
125 }
126 
127 
128 static 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 
150 static int __init
151 lan_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 
195 static 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 
207 static 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 
213 MODULE_DEVICE_TABLE(parisc, lan_tbl);
214 
215 static 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 
222 static int lasi_82596_init(void)
223 {
224 	printk(KERN_INFO LASI_82596_DRIVER_VERSION "\n");
225 	return register_parisc_driver(&lan_driver);
226 }
227 
228 module_init(lasi_82596_init);
229 
230 static void __exit lasi_82596_exit(void)
231 {
232 	unregister_parisc_driver(&lan_driver);
233 }
234 
235 module_exit(lasi_82596_exit);
236