Root/drivers/net/xtsonic.c

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
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
111static 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
123static 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 "
198                " descriptors.\n", dev_name(lp->device));
199        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
220    dev->netdev_ops = &xtsonic_netdev_ops;
221    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
249    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
271    printk("%s: SONIC ethernet @%08lx, MAC %pM, IRQ %d\n", dev->name,
272           dev->base_addr, dev->dev_addr, dev->irq);
273
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);
325

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