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 SYSBUS      0x0000006c
100
101/* big endian CPU, 82596 "big" endian mode */
102#define SWAP32(x)   (((u32)(x)<<16) | ((((u32)(x)))>>16))
103#define SWAP16(x)   (x)
104
105#define NONCOHERENT_DMA 1
106
107#include "lib82596.c"
108
109MODULE_AUTHOR("Richard Hirst");
110MODULE_DESCRIPTION("i82596 driver");
111MODULE_LICENSE("GPL");
112module_param(i596_debug, int, 0);
113MODULE_PARM_DESC(i596_debug, "lasi_82596 debug mask");
114
115static inline void ca(struct net_device *dev)
116{
117	gsc_writel(0, dev->base_addr + PA_CHANNEL_ATTENTION);
118}
119
120
121static void mpu_port(struct net_device *dev, int c, dma_addr_t x)
122{
123	struct i596_private *lp = netdev_priv(dev);
124
125	u32 v = (u32) (c) | (u32) (x);
126	u16 a, b;
127
128	if (lp->options & OPT_SWAP_PORT) {
129		a = v >> 16;
130		b = v & 0xffff;
131	} else {
132		a = v & 0xffff;
133		b = v >> 16;
134	}
135
136	gsc_writel(a, dev->base_addr + PA_CPU_PORT_L_ACCESS);
137	if (!running_on_qemu)
138		udelay(1);
139	gsc_writel(b, dev->base_addr + PA_CPU_PORT_L_ACCESS);
140}
141
142#define LAN_PROM_ADDR	0xF0810000
143
144static int __init
145lan_init_chip(struct parisc_device *dev)
146{
147	struct	net_device *netdevice;
148	struct i596_private *lp;
149	int retval = -ENOMEM;
150	int i;
151
152	if (!dev->irq) {
153		printk(KERN_ERR "%s: IRQ not found for i82596 at 0x%lx\n",
154			__FILE__, (unsigned long)dev->hpa.start);
155		return -ENODEV;
156	}
157
158	printk(KERN_INFO "Found i82596 at 0x%lx, IRQ %d\n",
159			(unsigned long)dev->hpa.start, dev->irq);
160
161	netdevice = alloc_etherdev(sizeof(struct i596_private));
162	if (!netdevice)
163		return -ENOMEM;
164	SET_NETDEV_DEV(netdevice, &dev->dev);
165	parisc_set_drvdata (dev, netdevice);
166
167	netdevice->base_addr = dev->hpa.start;
168	netdevice->irq = dev->irq;
169
170	if (pdc_lan_station_id(netdevice->dev_addr, netdevice->base_addr)) {
171		for (i = 0; i < 6; i++) {
172			netdevice->dev_addr[i] = gsc_readb(LAN_PROM_ADDR + i);
173		}
174		printk(KERN_INFO
175		       "%s: MAC of HP700 LAN read from EEPROM\n", __FILE__);
176	}
177
178	lp = netdev_priv(netdevice);
179	lp->options = dev->id.sversion == 0x72 ? OPT_SWAP_PORT : 0;
180	lp->dma = dma_alloc_noncoherent(&dev->dev,
181			sizeof(struct i596_dma), &lp->dma_addr,
182			DMA_BIDIRECTIONAL, GFP_KERNEL);
183	if (!lp->dma)
184		goto out_free_netdev;
185
186	retval = i82596_probe(netdevice);
187	if (retval)
188		goto out_free_dma;
189	return 0;
190
191out_free_dma:
192	dma_free_noncoherent(&dev->dev, sizeof(struct i596_dma),
193		       lp->dma, lp->dma_addr, DMA_BIDIRECTIONAL);
194out_free_netdev:
195	free_netdev(netdevice);
196	return retval;
197}
198
199static int __exit 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_noncoherent(&pdev->dev, sizeof(struct i596_private), lp->dma,
206		       lp->dma_addr, DMA_BIDIRECTIONAL);
207	free_netdev (dev);
208	return 0;
209}
210
211static const struct parisc_device_id lan_tbl[] __initconst = {
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 __refdata = {
220	.name		= "lasi_82596",
221	.id_table	= lan_tbl,
222	.probe		= lan_init_chip,
223	.remove         = __exit_p(lan_remove_chip),
224};
225
226static int 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