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1/*
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/gfp.h>
24#include <linux/interrupt.h>
25#include <linux/init.h>
26#include <linux/ioport.h>
27#include <linux/in.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#include <linux/slab.h>
37
38#include <asm/io.h>
39#include <asm/pgtable.h>
40#include <asm/dma.h>
41
42static char xtsonic_string[] = "xtsonic";
43
44extern unsigned xtboard_nvram_valid(void);
45extern void xtboard_get_ether_addr(unsigned char *buf);
46
47#include "sonic.h"
48
49/*
50 * According to the documentation for the Sonic ethernet controller,
51 * EOBC should be 760 words (1520 bytes) for 32-bit applications, and,
52 * as such, 2 words less than the buffer size. The value for RBSIZE
53 * defined in sonic.h, however is only 1520.
54 *
55 * (Note that in 16-bit configurations, EOBC is 759 words (1518 bytes) and
56 * RBSIZE 1520 bytes)
57 */
58#undef SONIC_RBSIZE
59#define SONIC_RBSIZE 1524
60
61/*
62 * The chip provides 256 byte register space.
63 */
64#define SONIC_MEM_SIZE 0x100
65
66/*
67 * Macros to access SONIC registers
68 */
69#define SONIC_READ(reg) \
70 (0xffff & *((volatile unsigned int *)dev->base_addr+reg))
71
72#define SONIC_WRITE(reg,val) \
73 *((volatile unsigned int *)dev->base_addr+reg) = val
74
75
76/* Use 0 for production, 1 for verification, and >2 for debug */
77#ifdef SONIC_DEBUG
78static unsigned int sonic_debug = SONIC_DEBUG;
79#else
80static unsigned int sonic_debug = 1;
81#endif
82
83/*
84 * We cannot use station (ethernet) address prefixes to detect the
85 * sonic controller since these are board manufacturer depended.
86 * So we check for known Silicon Revision IDs instead.
87 */
88static unsigned short known_revisions[] =
89{
90 0x101, /* SONIC 83934 */
91 0xffff /* end of list */
92};
93
94static int xtsonic_open(struct net_device *dev)
95{
96 int retval;
97
98 retval = request_irq(dev->irq, sonic_interrupt, IRQF_DISABLED,
99 "sonic", dev);
100 if (retval) {
101 printk(KERN_ERR "%s: unable to get IRQ %d.\n",
102 dev->name, dev->irq);
103 return -EAGAIN;
104 }
105
106 retval = sonic_open(dev);
107 if (retval)
108 free_irq(dev->irq, dev);
109 return retval;
110}
111
112static int xtsonic_close(struct net_device *dev)
113{
114 int err;
115 err = sonic_close(dev);
116 free_irq(dev->irq, dev);
117 return err;
118}
119
120static const struct net_device_ops xtsonic_netdev_ops = {
121 .ndo_open = xtsonic_open,
122 .ndo_stop = xtsonic_close,
123 .ndo_start_xmit = sonic_send_packet,
124 .ndo_get_stats = sonic_get_stats,
125 .ndo_set_multicast_list = sonic_multicast_list,
126 .ndo_tx_timeout = sonic_tx_timeout,
127 .ndo_validate_addr = eth_validate_addr,
128 .ndo_change_mtu = eth_change_mtu,
129 .ndo_set_mac_address = eth_mac_addr,
130};
131
132static int __init sonic_probe1(struct net_device *dev)
133{
134 static unsigned version_printed = 0;
135 unsigned int silicon_revision;
136 struct sonic_local *lp = netdev_priv(dev);
137 unsigned int base_addr = dev->base_addr;
138 int i;
139 int err = 0;
140
141 if (!request_mem_region(base_addr, 0x100, xtsonic_string))
142 return -EBUSY;
143
144 /*
145 * get the Silicon Revision ID. If this is one of the known
146 * one assume that we found a SONIC ethernet controller at
147 * the expected location.
148 */
149 silicon_revision = SONIC_READ(SONIC_SR);
150 if (sonic_debug > 1)
151 printk("SONIC Silicon Revision = 0x%04x\n",silicon_revision);
152
153 i = 0;
154 while ((known_revisions[i] != 0xffff) &&
155 (known_revisions[i] != silicon_revision))
156 i++;
157
158 if (known_revisions[i] == 0xffff) {
159 printk("SONIC ethernet controller not found (0x%4x)\n",
160 silicon_revision);
161 return -ENODEV;
162 }
163
164 if (sonic_debug && version_printed++ == 0)
165 printk(version);
166
167 /*
168 * Put the sonic into software reset, then retrieve ethernet address.
169 * Note: we are assuming that the boot-loader has initialized the cam.
170 */
171 SONIC_WRITE(SONIC_CMD,SONIC_CR_RST);
172 SONIC_WRITE(SONIC_DCR,
173 SONIC_DCR_WC0|SONIC_DCR_DW|SONIC_DCR_LBR|SONIC_DCR_SBUS);
174 SONIC_WRITE(SONIC_CEP,0);
175 SONIC_WRITE(SONIC_IMR,0);
176
177 SONIC_WRITE(SONIC_CMD,SONIC_CR_RST);
178 SONIC_WRITE(SONIC_CEP,0);
179
180 for (i=0; i<3; i++) {
181 unsigned int val = SONIC_READ(SONIC_CAP0-i);
182 dev->dev_addr[i*2] = val;
183 dev->dev_addr[i*2+1] = val >> 8;
184 }
185
186 /* Initialize the device structure. */
187
188 lp->dma_bitmode = SONIC_BITMODE32;
189
190 /*
191 * Allocate local private descriptor areas in uncached space.
192 * The entire structure must be located within the same 64kb segment.
193 * A simple way to ensure this is to allocate twice the
194 * size of the structure -- given that the structure is
195 * much less than 64 kB, at least one of the halves of
196 * the allocated area will be contained entirely in 64 kB.
197 * We also allocate extra space for a pointer to allow freeing
198 * this structure later on (in xtsonic_cleanup_module()).
199 */
200 lp->descriptors =
201 dma_alloc_coherent(lp->device,
202 SIZEOF_SONIC_DESC * SONIC_BUS_SCALE(lp->dma_bitmode),
203 &lp->descriptors_laddr, GFP_KERNEL);
204
205 if (lp->descriptors == NULL) {
206 printk(KERN_ERR "%s: couldn't alloc DMA memory for "
207 " descriptors.\n", dev_name(lp->device));
208 goto out;
209 }
210
211 lp->cda = lp->descriptors;
212 lp->tda = lp->cda + (SIZEOF_SONIC_CDA
213 * SONIC_BUS_SCALE(lp->dma_bitmode));
214 lp->rda = lp->tda + (SIZEOF_SONIC_TD * SONIC_NUM_TDS
215 * SONIC_BUS_SCALE(lp->dma_bitmode));
216 lp->rra = lp->rda + (SIZEOF_SONIC_RD * SONIC_NUM_RDS
217 * SONIC_BUS_SCALE(lp->dma_bitmode));
218
219 /* get the virtual dma address */
220
221 lp->cda_laddr = lp->descriptors_laddr;
222 lp->tda_laddr = lp->cda_laddr + (SIZEOF_SONIC_CDA
223 * SONIC_BUS_SCALE(lp->dma_bitmode));
224 lp->rda_laddr = lp->tda_laddr + (SIZEOF_SONIC_TD * SONIC_NUM_TDS
225 * SONIC_BUS_SCALE(lp->dma_bitmode));
226 lp->rra_laddr = lp->rda_laddr + (SIZEOF_SONIC_RD * SONIC_NUM_RDS
227 * SONIC_BUS_SCALE(lp->dma_bitmode));
228
229 dev->netdev_ops = &xtsonic_netdev_ops;
230 dev->watchdog_timeo = TX_TIMEOUT;
231
232 /*
233 * clear tally counter
234 */
235 SONIC_WRITE(SONIC_CRCT,0xffff);
236 SONIC_WRITE(SONIC_FAET,0xffff);
237 SONIC_WRITE(SONIC_MPT,0xffff);
238
239 return 0;
240out:
241 release_region(dev->base_addr, SONIC_MEM_SIZE);
242 return err;
243}
244
245
246/*
247 * Probe for a SONIC ethernet controller on an XT2000 board.
248 * Actually probing is superfluous but we're paranoid.
249 */
250
251int __devinit xtsonic_probe(struct platform_device *pdev)
252{
253 struct net_device *dev;
254 struct sonic_local *lp;
255 struct resource *resmem, *resirq;
256 int err = 0;
257
258 if ((resmem = platform_get_resource(pdev, IORESOURCE_MEM, 0)) == NULL)
259 return -ENODEV;
260
261 if ((resirq = platform_get_resource(pdev, IORESOURCE_IRQ, 0)) == NULL)
262 return -ENODEV;
263
264 if ((dev = alloc_etherdev(sizeof(struct sonic_local))) == NULL)
265 return -ENOMEM;
266
267 lp = netdev_priv(dev);
268 lp->device = &pdev->dev;
269 SET_NETDEV_DEV(dev, &pdev->dev);
270 netdev_boot_setup_check(dev);
271
272 dev->base_addr = resmem->start;
273 dev->irq = resirq->start;
274
275 if ((err = sonic_probe1(dev)))
276 goto out;
277 if ((err = register_netdev(dev)))
278 goto out1;
279
280 printk("%s: SONIC ethernet @%08lx, MAC %pM, IRQ %d\n", dev->name,
281 dev->base_addr, dev->dev_addr, dev->irq);
282
283 return 0;
284
285out1:
286 release_region(dev->base_addr, SONIC_MEM_SIZE);
287out:
288 free_netdev(dev);
289
290 return err;
291}
292
293MODULE_DESCRIPTION("Xtensa XT2000 SONIC ethernet driver");
294module_param(sonic_debug, int, 0);
295MODULE_PARM_DESC(sonic_debug, "xtsonic debug level (1-4)");
296
297#include "sonic.c"
298
299static int __devexit xtsonic_device_remove (struct platform_device *pdev)
300{
301 struct net_device *dev = platform_get_drvdata(pdev);
302 struct sonic_local *lp = netdev_priv(dev);
303
304 unregister_netdev(dev);
305 dma_free_coherent(lp->device,
306 SIZEOF_SONIC_DESC * SONIC_BUS_SCALE(lp->dma_bitmode),
307 lp->descriptors, lp->descriptors_laddr);
308 release_region (dev->base_addr, SONIC_MEM_SIZE);
309 free_netdev(dev);
310
311 return 0;
312}
313
314static struct platform_driver xtsonic_driver = {
315 .probe = xtsonic_probe,
316 .remove = __devexit_p(xtsonic_device_remove),
317 .driver = {
318 .name = xtsonic_string,
319 },
320};
321
322static int __init xtsonic_init(void)
323{
324 return platform_driver_register(&xtsonic_driver);
325}
326
327static void __exit xtsonic_cleanup(void)
328{
329 platform_driver_unregister(&xtsonic_driver);
330}
331
332module_init(xtsonic_init);
333module_exit(xtsonic_cleanup);