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Chris Zankel74f2a5f02008-05-05 23:36:35 -07001/*
2 * xtsonic.c
3 *
4 * (C) 2001 - 2007 Tensilica Inc.
5 * Kevin Chea <kchea@yahoo.com>
6 * Marc Gauthier <marc@linux-xtensa.org>
7 * Chris Zankel <chris@zankel.net>
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 the XT2000.
17 */
18
19#include <linux/kernel.h>
20#include <linux/module.h>
21#include <linux/types.h>
22#include <linux/fcntl.h>
23#include <linux/interrupt.h>
24#include <linux/init.h>
25#include <linux/ioport.h>
26#include <linux/in.h>
27#include <linux/slab.h>
28#include <linux/string.h>
29#include <linux/delay.h>
30#include <linux/errno.h>
31#include <linux/netdevice.h>
32#include <linux/etherdevice.h>
33#include <linux/skbuff.h>
34#include <linux/platform_device.h>
35#include <linux/dma-mapping.h>
36
37#include <asm/io.h>
38#include <asm/pgtable.h>
39#include <asm/dma.h>
40
41static char xtsonic_string[] = "xtsonic";
42
43extern unsigned xtboard_nvram_valid(void);
44extern void xtboard_get_ether_addr(unsigned char *buf);
45
46#include "sonic.h"
47
48/*
49 * According to the documentation for the Sonic ethernet controller,
50 * EOBC should be 760 words (1520 bytes) for 32-bit applications, and,
51 * as such, 2 words less than the buffer size. The value for RBSIZE
52 * defined in sonic.h, however is only 1520.
53 *
54 * (Note that in 16-bit configurations, EOBC is 759 words (1518 bytes) and
55 * RBSIZE 1520 bytes)
56 */
57#undef SONIC_RBSIZE
58#define SONIC_RBSIZE 1524
59
60/*
61 * The chip provides 256 byte register space.
62 */
63#define SONIC_MEM_SIZE 0x100
64
65/*
66 * Macros to access SONIC registers
67 */
68#define SONIC_READ(reg) \
69 (0xffff & *((volatile unsigned int *)dev->base_addr+reg))
70
71#define SONIC_WRITE(reg,val) \
72 *((volatile unsigned int *)dev->base_addr+reg) = val
73
74
75/* Use 0 for production, 1 for verification, and >2 for debug */
76#ifdef SONIC_DEBUG
77static unsigned int sonic_debug = SONIC_DEBUG;
78#else
79static unsigned int sonic_debug = 1;
80#endif
81
82/*
83 * We cannot use station (ethernet) address prefixes to detect the
84 * sonic controller since these are board manufacturer depended.
85 * So we check for known Silicon Revision IDs instead.
86 */
87static unsigned short known_revisions[] =
88{
89 0x101, /* SONIC 83934 */
90 0xffff /* end of list */
91};
92
93static int xtsonic_open(struct net_device *dev)
94{
95 if (request_irq(dev->irq,&sonic_interrupt,IRQF_DISABLED,"sonic",dev)) {
96 printk(KERN_ERR "%s: unable to get IRQ %d.\n",
97 dev->name, dev->irq);
98 return -EAGAIN;
99 }
100 return sonic_open(dev);
101}
102
103static int xtsonic_close(struct net_device *dev)
104{
105 int err;
106 err = sonic_close(dev);
107 free_irq(dev->irq, dev);
108 return err;
109}
110
Alexander Beregalovccd97bb2009-04-11 07:30:19 +0000111static const struct net_device_ops xtsonic_netdev_ops = {
112 .ndo_open = xtsonic_open,
113 .ndo_stop = xtsonic_close,
114 .ndo_start_xmit = sonic_send_packet,
115 .ndo_get_stats = sonic_get_stats,
116 .ndo_set_multicast_list = sonic_multicast_list,
117 .ndo_tx_timeout = sonic_tx_timeout,
118 .ndo_validate_addr = eth_validate_addr,
119 .ndo_change_mtu = eth_change_mtu,
120 .ndo_set_mac_address = eth_mac_addr,
121};
122
Chris Zankel74f2a5f02008-05-05 23:36:35 -0700123static int __init sonic_probe1(struct net_device *dev)
124{
125 static unsigned version_printed = 0;
126 unsigned int silicon_revision;
127 struct sonic_local *lp = netdev_priv(dev);
128 unsigned int base_addr = dev->base_addr;
129 int i;
130 int err = 0;
131
132 if (!request_mem_region(base_addr, 0x100, xtsonic_string))
133 return -EBUSY;
134
135 /*
136 * get the Silicon Revision ID. If this is one of the known
137 * one assume that we found a SONIC ethernet controller at
138 * the expected location.
139 */
140 silicon_revision = SONIC_READ(SONIC_SR);
141 if (sonic_debug > 1)
142 printk("SONIC Silicon Revision = 0x%04x\n",silicon_revision);
143
144 i = 0;
145 while ((known_revisions[i] != 0xffff) &&
146 (known_revisions[i] != silicon_revision))
147 i++;
148
149 if (known_revisions[i] == 0xffff) {
150 printk("SONIC ethernet controller not found (0x%4x)\n",
151 silicon_revision);
152 return -ENODEV;
153 }
154
155 if (sonic_debug && version_printed++ == 0)
156 printk(version);
157
158 /*
159 * Put the sonic into software reset, then retrieve ethernet address.
160 * Note: we are assuming that the boot-loader has initialized the cam.
161 */
162 SONIC_WRITE(SONIC_CMD,SONIC_CR_RST);
163 SONIC_WRITE(SONIC_DCR,
164 SONIC_DCR_WC0|SONIC_DCR_DW|SONIC_DCR_LBR|SONIC_DCR_SBUS);
165 SONIC_WRITE(SONIC_CEP,0);
166 SONIC_WRITE(SONIC_IMR,0);
167
168 SONIC_WRITE(SONIC_CMD,SONIC_CR_RST);
169 SONIC_WRITE(SONIC_CEP,0);
170
171 for (i=0; i<3; i++) {
172 unsigned int val = SONIC_READ(SONIC_CAP0-i);
173 dev->dev_addr[i*2] = val;
174 dev->dev_addr[i*2+1] = val >> 8;
175 }
176
177 /* Initialize the device structure. */
178
179 lp->dma_bitmode = SONIC_BITMODE32;
180
181 /*
182 * Allocate local private descriptor areas in uncached space.
183 * The entire structure must be located within the same 64kb segment.
184 * A simple way to ensure this is to allocate twice the
185 * size of the structure -- given that the structure is
186 * much less than 64 kB, at least one of the halves of
187 * the allocated area will be contained entirely in 64 kB.
188 * We also allocate extra space for a pointer to allow freeing
189 * this structure later on (in xtsonic_cleanup_module()).
190 */
191 lp->descriptors =
192 dma_alloc_coherent(lp->device,
193 SIZEOF_SONIC_DESC * SONIC_BUS_SCALE(lp->dma_bitmode),
194 &lp->descriptors_laddr, GFP_KERNEL);
195
196 if (lp->descriptors == NULL) {
197 printk(KERN_ERR "%s: couldn't alloc DMA memory for "
Kay Sieversc2313552009-03-24 16:38:22 -0700198 " descriptors.\n", dev_name(lp->device));
Chris Zankel74f2a5f02008-05-05 23:36:35 -0700199 goto out;
200 }
201
202 lp->cda = lp->descriptors;
203 lp->tda = lp->cda + (SIZEOF_SONIC_CDA
204 * SONIC_BUS_SCALE(lp->dma_bitmode));
205 lp->rda = lp->tda + (SIZEOF_SONIC_TD * SONIC_NUM_TDS
206 * SONIC_BUS_SCALE(lp->dma_bitmode));
207 lp->rra = lp->rda + (SIZEOF_SONIC_RD * SONIC_NUM_RDS
208 * SONIC_BUS_SCALE(lp->dma_bitmode));
209
210 /* get the virtual dma address */
211
212 lp->cda_laddr = lp->descriptors_laddr;
213 lp->tda_laddr = lp->cda_laddr + (SIZEOF_SONIC_CDA
214 * SONIC_BUS_SCALE(lp->dma_bitmode));
215 lp->rda_laddr = lp->tda_laddr + (SIZEOF_SONIC_TD * SONIC_NUM_TDS
216 * SONIC_BUS_SCALE(lp->dma_bitmode));
217 lp->rra_laddr = lp->rda_laddr + (SIZEOF_SONIC_RD * SONIC_NUM_RDS
218 * SONIC_BUS_SCALE(lp->dma_bitmode));
219
Alexander Beregalovccd97bb2009-04-11 07:30:19 +0000220 dev->netdev_ops = &xtsonic_netdev_ops;
Chris Zankel74f2a5f02008-05-05 23:36:35 -0700221 dev->watchdog_timeo = TX_TIMEOUT;
222
223 /*
224 * clear tally counter
225 */
226 SONIC_WRITE(SONIC_CRCT,0xffff);
227 SONIC_WRITE(SONIC_FAET,0xffff);
228 SONIC_WRITE(SONIC_MPT,0xffff);
229
230 return 0;
231out:
232 release_region(dev->base_addr, SONIC_MEM_SIZE);
233 return err;
234}
235
236
237/*
238 * Probe for a SONIC ethernet controller on an XT2000 board.
239 * Actually probing is superfluous but we're paranoid.
240 */
241
242int __init xtsonic_probe(struct platform_device *pdev)
243{
244 struct net_device *dev;
245 struct sonic_local *lp;
246 struct resource *resmem, *resirq;
247 int err = 0;
248
Chris Zankel74f2a5f02008-05-05 23:36:35 -0700249 if ((resmem = platform_get_resource(pdev, IORESOURCE_MEM, 0)) == NULL)
250 return -ENODEV;
251
252 if ((resirq = platform_get_resource(pdev, IORESOURCE_IRQ, 0)) == NULL)
253 return -ENODEV;
254
255 if ((dev = alloc_etherdev(sizeof(struct sonic_local))) == NULL)
256 return -ENOMEM;
257
258 lp = netdev_priv(dev);
259 lp->device = &pdev->dev;
260 SET_NETDEV_DEV(dev, &pdev->dev);
261 netdev_boot_setup_check(dev);
262
263 dev->base_addr = resmem->start;
264 dev->irq = resirq->start;
265
266 if ((err = sonic_probe1(dev)))
267 goto out;
268 if ((err = register_netdev(dev)))
269 goto out1;
270
Johannes Berge1749612008-10-27 15:59:26 -0700271 printk("%s: SONIC ethernet @%08lx, MAC %pM, IRQ %d\n", dev->name,
272 dev->base_addr, dev->dev_addr, dev->irq);
Chris Zankel74f2a5f02008-05-05 23:36:35 -0700273
274 return 0;
275
276out1:
277 release_region(dev->base_addr, SONIC_MEM_SIZE);
278out:
279 free_netdev(dev);
280
281 return err;
282}
283
284MODULE_DESCRIPTION("Xtensa XT2000 SONIC ethernet driver");
285module_param(sonic_debug, int, 0);
286MODULE_PARM_DESC(sonic_debug, "xtsonic debug level (1-4)");
287
288#include "sonic.c"
289
290static int __devexit xtsonic_device_remove (struct platform_device *pdev)
291{
292 struct net_device *dev = platform_get_drvdata(pdev);
293 struct sonic_local *lp = netdev_priv(dev);
294
295 unregister_netdev(dev);
296 dma_free_coherent(lp->device,
297 SIZEOF_SONIC_DESC * SONIC_BUS_SCALE(lp->dma_bitmode),
298 lp->descriptors, lp->descriptors_laddr);
299 release_region (dev->base_addr, SONIC_MEM_SIZE);
300 free_netdev(dev);
301
302 return 0;
303}
304
305static struct platform_driver xtsonic_driver = {
306 .probe = xtsonic_probe,
307 .remove = __devexit_p(xtsonic_device_remove),
308 .driver = {
309 .name = xtsonic_string,
310 },
311};
312
313static int __init xtsonic_init(void)
314{
315 return platform_driver_register(&xtsonic_driver);
316}
317
318static void __exit xtsonic_cleanup(void)
319{
320 platform_driver_unregister(&xtsonic_driver);
321}
322
323module_init(xtsonic_init);
324module_exit(xtsonic_cleanup);