clocksource: improve sh_cmt clocksource overflow handling
[linux-2.6.git] / drivers / net / jazzsonic.c
1 /*
2  * jazzsonic.c
3  *
4  * (C) 2005 Finn Thain
5  *
6  * Converted to DMA API, and (from the mac68k project) introduced
7  * dhd's support for 16-bit cards.
8  *
9  * (C) 1996,1998 by Thomas Bogendoerfer (tsbogend@alpha.franken.de)
10  *
11  * This driver is based on work from Andreas Busse, but most of
12  * the code is rewritten.
13  *
14  * (C) 1995 by Andreas Busse (andy@waldorf-gmbh.de)
15  *
16  * A driver for the onboard Sonic ethernet controller on Mips Jazz
17  * systems (Acer Pica-61, Mips Magnum 4000, Olivetti M700 and
18  * perhaps others, too)
19  */
20
21 #include <linux/kernel.h>
22 #include <linux/module.h>
23 #include <linux/types.h>
24 #include <linux/fcntl.h>
25 #include <linux/interrupt.h>
26 #include <linux/init.h>
27 #include <linux/ioport.h>
28 #include <linux/in.h>
29 #include <linux/slab.h>
30 #include <linux/string.h>
31 #include <linux/delay.h>
32 #include <linux/errno.h>
33 #include <linux/netdevice.h>
34 #include <linux/etherdevice.h>
35 #include <linux/skbuff.h>
36 #include <linux/platform_device.h>
37 #include <linux/dma-mapping.h>
38
39 #include <asm/bootinfo.h>
40 #include <asm/system.h>
41 #include <asm/pgtable.h>
42 #include <asm/io.h>
43 #include <asm/dma.h>
44 #include <asm/jazz.h>
45 #include <asm/jazzdma.h>
46
47 static char jazz_sonic_string[] = "jazzsonic";
48
49 #define SONIC_MEM_SIZE  0x100
50
51 #include "sonic.h"
52
53 /*
54  * Macros to access SONIC registers
55  */
56 #define SONIC_READ(reg) (*((volatile unsigned int *)dev->base_addr+reg))
57
58 #define SONIC_WRITE(reg,val)                                            \
59 do {                                                                    \
60         *((volatile unsigned int *)dev->base_addr+(reg)) = (val);               \
61 } while (0)
62
63
64 /* use 0 for production, 1 for verification, >1 for debug */
65 #ifdef SONIC_DEBUG
66 static unsigned int sonic_debug = SONIC_DEBUG;
67 #else
68 static unsigned int sonic_debug = 1;
69 #endif
70
71 /*
72  * We cannot use station (ethernet) address prefixes to detect the
73  * sonic controller since these are board manufacturer depended.
74  * So we check for known Silicon Revision IDs instead.
75  */
76 static unsigned short known_revisions[] =
77 {
78         0x04,                   /* Mips Magnum 4000 */
79         0xffff                  /* end of list */
80 };
81
82 static int jazzsonic_open(struct net_device* dev)
83 {
84         if (request_irq(dev->irq, &sonic_interrupt, IRQF_DISABLED, "sonic", dev)) {
85                 printk(KERN_ERR "%s: unable to get IRQ %d.\n", dev->name, dev->irq);
86                 return -EAGAIN;
87         }
88         return sonic_open(dev);
89 }
90
91 static int jazzsonic_close(struct net_device* dev)
92 {
93         int err;
94         err = sonic_close(dev);
95         free_irq(dev->irq, dev);
96         return err;
97 }
98
99 static int __init sonic_probe1(struct net_device *dev)
100 {
101         static unsigned version_printed;
102         unsigned int silicon_revision;
103         unsigned int val;
104         struct sonic_local *lp = netdev_priv(dev);
105         int err = -ENODEV;
106         int i;
107
108         if (!request_mem_region(dev->base_addr, SONIC_MEM_SIZE, jazz_sonic_string))
109                 return -EBUSY;
110
111         /*
112          * get the Silicon Revision ID. If this is one of the known
113          * one assume that we found a SONIC ethernet controller at
114          * the expected location.
115          */
116         silicon_revision = SONIC_READ(SONIC_SR);
117         if (sonic_debug > 1)
118                 printk("SONIC Silicon Revision = 0x%04x\n",silicon_revision);
119
120         i = 0;
121         while (known_revisions[i] != 0xffff
122                && known_revisions[i] != silicon_revision)
123                 i++;
124
125         if (known_revisions[i] == 0xffff) {
126                 printk("SONIC ethernet controller not found (0x%4x)\n",
127                        silicon_revision);
128                 goto out;
129         }
130
131         if (sonic_debug  &&  version_printed++ == 0)
132                 printk(version);
133
134         printk(KERN_INFO "%s: Sonic ethernet found at 0x%08lx, ",
135                dev_name(lp->device), dev->base_addr);
136
137         /*
138          * Put the sonic into software reset, then
139          * retrieve and print the ethernet address.
140          */
141         SONIC_WRITE(SONIC_CMD,SONIC_CR_RST);
142         SONIC_WRITE(SONIC_CEP,0);
143         for (i=0; i<3; i++) {
144                 val = SONIC_READ(SONIC_CAP0-i);
145                 dev->dev_addr[i*2] = val;
146                 dev->dev_addr[i*2+1] = val >> 8;
147         }
148
149         err = -ENOMEM;
150
151         /* Initialize the device structure. */
152
153         lp->dma_bitmode = SONIC_BITMODE32;
154
155         /* Allocate the entire chunk of memory for the descriptors.
156            Note that this cannot cross a 64K boundary. */
157         if ((lp->descriptors = dma_alloc_coherent(lp->device,
158                                 SIZEOF_SONIC_DESC * SONIC_BUS_SCALE(lp->dma_bitmode),
159                                 &lp->descriptors_laddr, GFP_KERNEL)) == NULL) {
160                 printk(KERN_ERR "%s: couldn't alloc DMA memory for descriptors.\n",
161                        dev_name(lp->device));
162                 goto out;
163         }
164
165         /* Now set up the pointers to point to the appropriate places */
166         lp->cda = lp->descriptors;
167         lp->tda = lp->cda + (SIZEOF_SONIC_CDA
168                              * SONIC_BUS_SCALE(lp->dma_bitmode));
169         lp->rda = lp->tda + (SIZEOF_SONIC_TD * SONIC_NUM_TDS
170                              * SONIC_BUS_SCALE(lp->dma_bitmode));
171         lp->rra = lp->rda + (SIZEOF_SONIC_RD * SONIC_NUM_RDS
172                              * SONIC_BUS_SCALE(lp->dma_bitmode));
173
174         lp->cda_laddr = lp->descriptors_laddr;
175         lp->tda_laddr = lp->cda_laddr + (SIZEOF_SONIC_CDA
176                              * SONIC_BUS_SCALE(lp->dma_bitmode));
177         lp->rda_laddr = lp->tda_laddr + (SIZEOF_SONIC_TD * SONIC_NUM_TDS
178                              * SONIC_BUS_SCALE(lp->dma_bitmode));
179         lp->rra_laddr = lp->rda_laddr + (SIZEOF_SONIC_RD * SONIC_NUM_RDS
180                              * SONIC_BUS_SCALE(lp->dma_bitmode));
181
182         dev->open = jazzsonic_open;
183         dev->stop = jazzsonic_close;
184         dev->hard_start_xmit = sonic_send_packet;
185         dev->get_stats = sonic_get_stats;
186         dev->set_multicast_list = &sonic_multicast_list;
187         dev->tx_timeout = sonic_tx_timeout;
188         dev->watchdog_timeo = TX_TIMEOUT;
189
190         /*
191          * clear tally counter
192          */
193         SONIC_WRITE(SONIC_CRCT,0xffff);
194         SONIC_WRITE(SONIC_FAET,0xffff);
195         SONIC_WRITE(SONIC_MPT,0xffff);
196
197         return 0;
198 out:
199         release_region(dev->base_addr, SONIC_MEM_SIZE);
200         return err;
201 }
202
203 /*
204  * Probe for a SONIC ethernet controller on a Mips Jazz board.
205  * Actually probing is superfluous but we're paranoid.
206  */
207 static int __init jazz_sonic_probe(struct platform_device *pdev)
208 {
209         struct net_device *dev;
210         struct sonic_local *lp;
211         struct resource *res;
212         int err = 0;
213
214         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
215         if (!res)
216                 return -ENODEV;
217
218         dev = alloc_etherdev(sizeof(struct sonic_local));
219         if (!dev)
220                 return -ENOMEM;
221
222         lp = netdev_priv(dev);
223         lp->device = &pdev->dev;
224         SET_NETDEV_DEV(dev, &pdev->dev);
225
226         netdev_boot_setup_check(dev);
227
228         dev->base_addr = res->start;
229         dev->irq = platform_get_irq(pdev, 0);
230         err = sonic_probe1(dev);
231         if (err)
232                 goto out;
233         err = register_netdev(dev);
234         if (err)
235                 goto out1;
236
237         printk("%s: MAC %pM IRQ %d\n", dev->name, dev->dev_addr, dev->irq);
238
239         return 0;
240
241 out1:
242         release_region(dev->base_addr, SONIC_MEM_SIZE);
243 out:
244         free_netdev(dev);
245
246         return err;
247 }
248
249 MODULE_DESCRIPTION("Jazz SONIC ethernet driver");
250 module_param(sonic_debug, int, 0);
251 MODULE_PARM_DESC(sonic_debug, "jazzsonic debug level (1-4)");
252 MODULE_ALIAS("platform:jazzsonic");
253
254 #include "sonic.c"
255
256 static int __devexit jazz_sonic_device_remove (struct platform_device *pdev)
257 {
258         struct net_device *dev = platform_get_drvdata(pdev);
259         struct sonic_local* lp = netdev_priv(dev);
260
261         unregister_netdev(dev);
262         dma_free_coherent(lp->device, SIZEOF_SONIC_DESC * SONIC_BUS_SCALE(lp->dma_bitmode),
263                           lp->descriptors, lp->descriptors_laddr);
264         release_region (dev->base_addr, SONIC_MEM_SIZE);
265         free_netdev(dev);
266
267         return 0;
268 }
269
270 static struct platform_driver jazz_sonic_driver = {
271         .probe  = jazz_sonic_probe,
272         .remove = __devexit_p(jazz_sonic_device_remove),
273         .driver = {
274                 .name   = jazz_sonic_string,
275                 .owner  = THIS_MODULE,
276         },
277 };
278
279 static int __init jazz_sonic_init_module(void)
280 {
281         return platform_driver_register(&jazz_sonic_driver);
282 }
283
284 static void __exit jazz_sonic_cleanup_module(void)
285 {
286         platform_driver_unregister(&jazz_sonic_driver);
287 }
288
289 module_init(jazz_sonic_init_module);
290 module_exit(jazz_sonic_cleanup_module);