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74f2a5f0 CZ |
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/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 | ||
41 | static char xtsonic_string[] = "xtsonic"; | |
42 | ||
43 | extern unsigned xtboard_nvram_valid(void); | |
44 | extern 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 | |
77 | static unsigned int sonic_debug = SONIC_DEBUG; | |
78 | #else | |
79 | static 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 | */ | |
87 | static unsigned short known_revisions[] = | |
88 | { | |
89 | 0x101, /* SONIC 83934 */ | |
90 | 0xffff /* end of list */ | |
91 | }; | |
92 | ||
93 | static 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 | ||
103 | static 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 | ||
111 | static int __init sonic_probe1(struct net_device *dev) | |
112 | { | |
113 | static unsigned version_printed = 0; | |
114 | unsigned int silicon_revision; | |
115 | struct sonic_local *lp = netdev_priv(dev); | |
116 | unsigned int base_addr = dev->base_addr; | |
117 | int i; | |
118 | int err = 0; | |
119 | ||
120 | if (!request_mem_region(base_addr, 0x100, xtsonic_string)) | |
121 | return -EBUSY; | |
122 | ||
123 | /* | |
124 | * get the Silicon Revision ID. If this is one of the known | |
125 | * one assume that we found a SONIC ethernet controller at | |
126 | * the expected location. | |
127 | */ | |
128 | silicon_revision = SONIC_READ(SONIC_SR); | |
129 | if (sonic_debug > 1) | |
130 | printk("SONIC Silicon Revision = 0x%04x\n",silicon_revision); | |
131 | ||
132 | i = 0; | |
133 | while ((known_revisions[i] != 0xffff) && | |
134 | (known_revisions[i] != silicon_revision)) | |
135 | i++; | |
136 | ||
137 | if (known_revisions[i] == 0xffff) { | |
138 | printk("SONIC ethernet controller not found (0x%4x)\n", | |
139 | silicon_revision); | |
140 | return -ENODEV; | |
141 | } | |
142 | ||
143 | if (sonic_debug && version_printed++ == 0) | |
144 | printk(version); | |
145 | ||
146 | /* | |
147 | * Put the sonic into software reset, then retrieve ethernet address. | |
148 | * Note: we are assuming that the boot-loader has initialized the cam. | |
149 | */ | |
150 | SONIC_WRITE(SONIC_CMD,SONIC_CR_RST); | |
151 | SONIC_WRITE(SONIC_DCR, | |
152 | SONIC_DCR_WC0|SONIC_DCR_DW|SONIC_DCR_LBR|SONIC_DCR_SBUS); | |
153 | SONIC_WRITE(SONIC_CEP,0); | |
154 | SONIC_WRITE(SONIC_IMR,0); | |
155 | ||
156 | SONIC_WRITE(SONIC_CMD,SONIC_CR_RST); | |
157 | SONIC_WRITE(SONIC_CEP,0); | |
158 | ||
159 | for (i=0; i<3; i++) { | |
160 | unsigned int val = SONIC_READ(SONIC_CAP0-i); | |
161 | dev->dev_addr[i*2] = val; | |
162 | dev->dev_addr[i*2+1] = val >> 8; | |
163 | } | |
164 | ||
165 | /* Initialize the device structure. */ | |
166 | ||
167 | lp->dma_bitmode = SONIC_BITMODE32; | |
168 | ||
169 | /* | |
170 | * Allocate local private descriptor areas in uncached space. | |
171 | * The entire structure must be located within the same 64kb segment. | |
172 | * A simple way to ensure this is to allocate twice the | |
173 | * size of the structure -- given that the structure is | |
174 | * much less than 64 kB, at least one of the halves of | |
175 | * the allocated area will be contained entirely in 64 kB. | |
176 | * We also allocate extra space for a pointer to allow freeing | |
177 | * this structure later on (in xtsonic_cleanup_module()). | |
178 | */ | |
179 | lp->descriptors = | |
180 | dma_alloc_coherent(lp->device, | |
181 | SIZEOF_SONIC_DESC * SONIC_BUS_SCALE(lp->dma_bitmode), | |
182 | &lp->descriptors_laddr, GFP_KERNEL); | |
183 | ||
184 | if (lp->descriptors == NULL) { | |
185 | printk(KERN_ERR "%s: couldn't alloc DMA memory for " | |
186 | " descriptors.\n", lp->device->bus_id); | |
187 | goto out; | |
188 | } | |
189 | ||
190 | lp->cda = lp->descriptors; | |
191 | lp->tda = lp->cda + (SIZEOF_SONIC_CDA | |
192 | * SONIC_BUS_SCALE(lp->dma_bitmode)); | |
193 | lp->rda = lp->tda + (SIZEOF_SONIC_TD * SONIC_NUM_TDS | |
194 | * SONIC_BUS_SCALE(lp->dma_bitmode)); | |
195 | lp->rra = lp->rda + (SIZEOF_SONIC_RD * SONIC_NUM_RDS | |
196 | * SONIC_BUS_SCALE(lp->dma_bitmode)); | |
197 | ||
198 | /* get the virtual dma address */ | |
199 | ||
200 | lp->cda_laddr = lp->descriptors_laddr; | |
201 | lp->tda_laddr = lp->cda_laddr + (SIZEOF_SONIC_CDA | |
202 | * SONIC_BUS_SCALE(lp->dma_bitmode)); | |
203 | lp->rda_laddr = lp->tda_laddr + (SIZEOF_SONIC_TD * SONIC_NUM_TDS | |
204 | * SONIC_BUS_SCALE(lp->dma_bitmode)); | |
205 | lp->rra_laddr = lp->rda_laddr + (SIZEOF_SONIC_RD * SONIC_NUM_RDS | |
206 | * SONIC_BUS_SCALE(lp->dma_bitmode)); | |
207 | ||
208 | dev->open = xtsonic_open; | |
209 | dev->stop = xtsonic_close; | |
210 | dev->hard_start_xmit = sonic_send_packet; | |
211 | dev->get_stats = sonic_get_stats; | |
212 | dev->set_multicast_list = &sonic_multicast_list; | |
213 | dev->tx_timeout = sonic_tx_timeout; | |
214 | dev->watchdog_timeo = TX_TIMEOUT; | |
215 | ||
216 | /* | |
217 | * clear tally counter | |
218 | */ | |
219 | SONIC_WRITE(SONIC_CRCT,0xffff); | |
220 | SONIC_WRITE(SONIC_FAET,0xffff); | |
221 | SONIC_WRITE(SONIC_MPT,0xffff); | |
222 | ||
223 | return 0; | |
224 | out: | |
225 | release_region(dev->base_addr, SONIC_MEM_SIZE); | |
226 | return err; | |
227 | } | |
228 | ||
229 | ||
230 | /* | |
231 | * Probe for a SONIC ethernet controller on an XT2000 board. | |
232 | * Actually probing is superfluous but we're paranoid. | |
233 | */ | |
234 | ||
235 | int __init xtsonic_probe(struct platform_device *pdev) | |
236 | { | |
237 | struct net_device *dev; | |
238 | struct sonic_local *lp; | |
239 | struct resource *resmem, *resirq; | |
240 | int err = 0; | |
241 | ||
74f2a5f0 CZ |
242 | if ((resmem = platform_get_resource(pdev, IORESOURCE_MEM, 0)) == NULL) |
243 | return -ENODEV; | |
244 | ||
245 | if ((resirq = platform_get_resource(pdev, IORESOURCE_IRQ, 0)) == NULL) | |
246 | return -ENODEV; | |
247 | ||
248 | if ((dev = alloc_etherdev(sizeof(struct sonic_local))) == NULL) | |
249 | return -ENOMEM; | |
250 | ||
251 | lp = netdev_priv(dev); | |
252 | lp->device = &pdev->dev; | |
253 | SET_NETDEV_DEV(dev, &pdev->dev); | |
254 | netdev_boot_setup_check(dev); | |
255 | ||
256 | dev->base_addr = resmem->start; | |
257 | dev->irq = resirq->start; | |
258 | ||
259 | if ((err = sonic_probe1(dev))) | |
260 | goto out; | |
261 | if ((err = register_netdev(dev))) | |
262 | goto out1; | |
263 | ||
e174961c JB |
264 | printk("%s: SONIC ethernet @%08lx, MAC %pM, IRQ %d\n", dev->name, |
265 | dev->base_addr, dev->dev_addr, dev->irq); | |
74f2a5f0 CZ |
266 | |
267 | return 0; | |
268 | ||
269 | out1: | |
270 | release_region(dev->base_addr, SONIC_MEM_SIZE); | |
271 | out: | |
272 | free_netdev(dev); | |
273 | ||
274 | return err; | |
275 | } | |
276 | ||
277 | MODULE_DESCRIPTION("Xtensa XT2000 SONIC ethernet driver"); | |
278 | module_param(sonic_debug, int, 0); | |
279 | MODULE_PARM_DESC(sonic_debug, "xtsonic debug level (1-4)"); | |
280 | ||
281 | #include "sonic.c" | |
282 | ||
283 | static int __devexit xtsonic_device_remove (struct platform_device *pdev) | |
284 | { | |
285 | struct net_device *dev = platform_get_drvdata(pdev); | |
286 | struct sonic_local *lp = netdev_priv(dev); | |
287 | ||
288 | unregister_netdev(dev); | |
289 | dma_free_coherent(lp->device, | |
290 | SIZEOF_SONIC_DESC * SONIC_BUS_SCALE(lp->dma_bitmode), | |
291 | lp->descriptors, lp->descriptors_laddr); | |
292 | release_region (dev->base_addr, SONIC_MEM_SIZE); | |
293 | free_netdev(dev); | |
294 | ||
295 | return 0; | |
296 | } | |
297 | ||
298 | static struct platform_driver xtsonic_driver = { | |
299 | .probe = xtsonic_probe, | |
300 | .remove = __devexit_p(xtsonic_device_remove), | |
301 | .driver = { | |
302 | .name = xtsonic_string, | |
303 | }, | |
304 | }; | |
305 | ||
306 | static int __init xtsonic_init(void) | |
307 | { | |
308 | return platform_driver_register(&xtsonic_driver); | |
309 | } | |
310 | ||
311 | static void __exit xtsonic_cleanup(void) | |
312 | { | |
313 | platform_driver_unregister(&xtsonic_driver); | |
314 | } | |
315 | ||
316 | module_init(xtsonic_init); | |
317 | module_exit(xtsonic_cleanup); |