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>
9 * (C) 1996,1998 by Thomas Bogendoerfer (tsbogend@alpha.franken.de)
11 * This driver is based on work from Andreas Busse, but most of
12 * the code is rewritten.
14 * (C) 1995 by Andreas Busse (andy@waldorf-gmbh.de)
16 * A driver for the onboard Sonic ethernet controller on the XT2000.
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>
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>
38 #include <asm/pgtable.h>
41 static char xtsonic_string[] = "xtsonic";
43 extern unsigned xtboard_nvram_valid(void);
44 extern void xtboard_get_ether_addr(unsigned char *buf);
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.
54 * (Note that in 16-bit configurations, EOBC is 759 words (1518 bytes) and
58 #define SONIC_RBSIZE 1524
61 * The chip provides 256 byte register space.
63 #define SONIC_MEM_SIZE 0x100
66 * Macros to access SONIC registers
68 #define SONIC_READ(reg) \
69 (0xffff & *((volatile unsigned int *)dev->base_addr+reg))
71 #define SONIC_WRITE(reg,val) \
72 *((volatile unsigned int *)dev->base_addr+reg) = val
75 /* Use 0 for production, 1 for verification, and >2 for debug */
77 static unsigned int sonic_debug = SONIC_DEBUG;
79 static unsigned int sonic_debug = 1;
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.
87 static unsigned short known_revisions[] =
89 0x101, /* SONIC 83934 */
90 0xffff /* end of list */
93 static int xtsonic_open(struct net_device *dev)
95 if (request_irq(dev->irq,&sonic_interrupt,IRQF_DISABLED,"sonic",dev)) {
96 printk(KERN_ERR "%s: unable to get IRQ %d.\n",
100 return sonic_open(dev);
103 static int xtsonic_close(struct net_device *dev)
106 err = sonic_close(dev);
107 free_irq(dev->irq, dev);
111 static 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,
123 static int __init sonic_probe1(struct net_device *dev)
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;
132 if (!request_mem_region(base_addr, 0x100, xtsonic_string))
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.
140 silicon_revision = SONIC_READ(SONIC_SR);
142 printk("SONIC Silicon Revision = 0x%04x\n",silicon_revision);
145 while ((known_revisions[i] != 0xffff) &&
146 (known_revisions[i] != silicon_revision))
149 if (known_revisions[i] == 0xffff) {
150 printk("SONIC ethernet controller not found (0x%4x)\n",
155 if (sonic_debug && version_printed++ == 0)
159 * Put the sonic into software reset, then retrieve ethernet address.
160 * Note: we are assuming that the boot-loader has initialized the cam.
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);
168 SONIC_WRITE(SONIC_CMD,SONIC_CR_RST);
169 SONIC_WRITE(SONIC_CEP,0);
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;
177 /* Initialize the device structure. */
179 lp->dma_bitmode = SONIC_BITMODE32;
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()).
192 dma_alloc_coherent(lp->device,
193 SIZEOF_SONIC_DESC * SONIC_BUS_SCALE(lp->dma_bitmode),
194 &lp->descriptors_laddr, GFP_KERNEL);
196 if (lp->descriptors == NULL) {
197 printk(KERN_ERR "%s: couldn't alloc DMA memory for "
198 " descriptors.\n", dev_name(lp->device));
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));
210 /* get the virtual dma address */
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));
220 dev->netdev_ops = &xtsonic_netdev_ops;
221 dev->watchdog_timeo = TX_TIMEOUT;
224 * clear tally counter
226 SONIC_WRITE(SONIC_CRCT,0xffff);
227 SONIC_WRITE(SONIC_FAET,0xffff);
228 SONIC_WRITE(SONIC_MPT,0xffff);
232 release_region(dev->base_addr, SONIC_MEM_SIZE);
238 * Probe for a SONIC ethernet controller on an XT2000 board.
239 * Actually probing is superfluous but we're paranoid.
242 int __init xtsonic_probe(struct platform_device *pdev)
244 struct net_device *dev;
245 struct sonic_local *lp;
246 struct resource *resmem, *resirq;
249 if ((resmem = platform_get_resource(pdev, IORESOURCE_MEM, 0)) == NULL)
252 if ((resirq = platform_get_resource(pdev, IORESOURCE_IRQ, 0)) == NULL)
255 if ((dev = alloc_etherdev(sizeof(struct sonic_local))) == NULL)
258 lp = netdev_priv(dev);
259 lp->device = &pdev->dev;
260 SET_NETDEV_DEV(dev, &pdev->dev);
261 netdev_boot_setup_check(dev);
263 dev->base_addr = resmem->start;
264 dev->irq = resirq->start;
266 if ((err = sonic_probe1(dev)))
268 if ((err = register_netdev(dev)))
271 printk("%s: SONIC ethernet @%08lx, MAC %pM, IRQ %d\n", dev->name,
272 dev->base_addr, dev->dev_addr, dev->irq);
277 release_region(dev->base_addr, SONIC_MEM_SIZE);
284 MODULE_DESCRIPTION("Xtensa XT2000 SONIC ethernet driver");
285 module_param(sonic_debug, int, 0);
286 MODULE_PARM_DESC(sonic_debug, "xtsonic debug level (1-4)");
290 static int __devexit xtsonic_device_remove (struct platform_device *pdev)
292 struct net_device *dev = platform_get_drvdata(pdev);
293 struct sonic_local *lp = netdev_priv(dev);
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);
305 static struct platform_driver xtsonic_driver = {
306 .probe = xtsonic_probe,
307 .remove = __devexit_p(xtsonic_device_remove),
309 .name = xtsonic_string,
313 static int __init xtsonic_init(void)
315 return platform_driver_register(&xtsonic_driver);
318 static void __exit xtsonic_cleanup(void)
320 platform_driver_unregister(&xtsonic_driver);
323 module_init(xtsonic_init);
324 module_exit(xtsonic_cleanup);