1 // SPDX-License-Identifier: GPL-2.0
5 * (C) 2001 - 2007 Tensilica Inc.
6 * Kevin Chea <kchea@yahoo.com>
7 * Marc Gauthier <marc@linux-xtensa.org>
8 * Chris Zankel <chris@zankel.net>
10 * (C) 1996,1998 by Thomas Bogendoerfer (tsbogend@alpha.franken.de)
12 * This driver is based on work from Andreas Busse, but most of
13 * the code is rewritten.
15 * (C) 1995 by Andreas Busse (andy@waldorf-gmbh.de)
17 * A driver for the onboard Sonic ethernet controller on the XT2000.
20 #include <linux/kernel.h>
21 #include <linux/module.h>
22 #include <linux/types.h>
23 #include <linux/fcntl.h>
24 #include <linux/gfp.h>
25 #include <linux/interrupt.h>
26 #include <linux/init.h>
27 #include <linux/ioport.h>
29 #include <linux/string.h>
30 #include <linux/delay.h>
31 #include <linux/errno.h>
32 #include <linux/netdevice.h>
33 #include <linux/etherdevice.h>
34 #include <linux/skbuff.h>
35 #include <linux/platform_device.h>
36 #include <linux/dma-mapping.h>
37 #include <linux/slab.h>
38 #include <linux/pgtable.h>
43 static char xtsonic_string[] = "xtsonic";
45 extern unsigned xtboard_nvram_valid(void);
46 extern void xtboard_get_ether_addr(unsigned char *buf);
51 * According to the documentation for the Sonic ethernet controller,
52 * EOBC should be 760 words (1520 bytes) for 32-bit applications, and,
53 * as such, 2 words less than the buffer size. The value for RBSIZE
54 * defined in sonic.h, however is only 1520.
56 * (Note that in 16-bit configurations, EOBC is 759 words (1518 bytes) and
60 #define SONIC_RBSIZE 1524
63 * The chip provides 256 byte register space.
65 #define SONIC_MEM_SIZE 0x100
68 * Macros to access SONIC registers
70 #define SONIC_READ(reg) \
71 (0xffff & *((volatile unsigned int *)dev->base_addr+reg))
73 #define SONIC_WRITE(reg,val) \
74 *((volatile unsigned int *)dev->base_addr+reg) = val
77 * We cannot use station (ethernet) address prefixes to detect the
78 * sonic controller since these are board manufacturer depended.
79 * So we check for known Silicon Revision IDs instead.
81 static unsigned short known_revisions[] =
83 0x101, /* SONIC 83934 */
84 0xffff /* end of list */
87 static int xtsonic_open(struct net_device *dev)
91 retval = request_irq(dev->irq, sonic_interrupt, 0, "sonic", dev);
93 printk(KERN_ERR "%s: unable to get IRQ %d.\n",
98 retval = sonic_open(dev);
100 free_irq(dev->irq, dev);
104 static int xtsonic_close(struct net_device *dev)
107 err = sonic_close(dev);
108 free_irq(dev->irq, dev);
112 static const struct net_device_ops xtsonic_netdev_ops = {
113 .ndo_open = xtsonic_open,
114 .ndo_stop = xtsonic_close,
115 .ndo_start_xmit = sonic_send_packet,
116 .ndo_get_stats = sonic_get_stats,
117 .ndo_set_rx_mode = sonic_multicast_list,
118 .ndo_tx_timeout = sonic_tx_timeout,
119 .ndo_validate_addr = eth_validate_addr,
120 .ndo_set_mac_address = eth_mac_addr,
123 static int __init sonic_probe1(struct net_device *dev)
125 unsigned int silicon_revision;
126 struct sonic_local *lp = netdev_priv(dev);
127 unsigned int base_addr = dev->base_addr;
131 if (!request_mem_region(base_addr, 0x100, xtsonic_string))
135 * get the Silicon Revision ID. If this is one of the known
136 * one assume that we found a SONIC ethernet controller at
137 * the expected location.
139 silicon_revision = SONIC_READ(SONIC_SR);
141 while ((known_revisions[i] != 0xffff) &&
142 (known_revisions[i] != silicon_revision))
145 if (known_revisions[i] == 0xffff) {
146 pr_info("SONIC ethernet controller not found (0x%4x)\n",
152 * Put the sonic into software reset, then retrieve ethernet address.
153 * Note: we are assuming that the boot-loader has initialized the cam.
155 SONIC_WRITE(SONIC_CMD,SONIC_CR_RST);
156 SONIC_WRITE(SONIC_DCR,
157 SONIC_DCR_WC0|SONIC_DCR_DW|SONIC_DCR_LBR|SONIC_DCR_SBUS);
158 SONIC_WRITE(SONIC_CEP,0);
159 SONIC_WRITE(SONIC_IMR,0);
161 SONIC_WRITE(SONIC_CMD,SONIC_CR_RST);
162 SONIC_WRITE(SONIC_CEP,0);
164 for (i=0; i<3; i++) {
165 unsigned int val = SONIC_READ(SONIC_CAP0-i);
166 dev->dev_addr[i*2] = val;
167 dev->dev_addr[i*2+1] = val >> 8;
170 lp->dma_bitmode = SONIC_BITMODE32;
172 err = sonic_alloc_descriptors(dev);
176 dev->netdev_ops = &xtsonic_netdev_ops;
177 dev->watchdog_timeo = TX_TIMEOUT;
180 * clear tally counter
182 SONIC_WRITE(SONIC_CRCT,0xffff);
183 SONIC_WRITE(SONIC_FAET,0xffff);
184 SONIC_WRITE(SONIC_MPT,0xffff);
188 release_region(dev->base_addr, SONIC_MEM_SIZE);
194 * Probe for a SONIC ethernet controller on an XT2000 board.
195 * Actually probing is superfluous but we're paranoid.
198 int xtsonic_probe(struct platform_device *pdev)
200 struct net_device *dev;
201 struct sonic_local *lp;
202 struct resource *resmem, *resirq;
205 if ((resmem = platform_get_resource(pdev, IORESOURCE_MEM, 0)) == NULL)
208 if ((resirq = platform_get_resource(pdev, IORESOURCE_IRQ, 0)) == NULL)
211 if ((dev = alloc_etherdev(sizeof(struct sonic_local))) == NULL)
214 lp = netdev_priv(dev);
215 lp->device = &pdev->dev;
216 platform_set_drvdata(pdev, dev);
217 SET_NETDEV_DEV(dev, &pdev->dev);
218 netdev_boot_setup_check(dev);
220 dev->base_addr = resmem->start;
221 dev->irq = resirq->start;
223 if ((err = sonic_probe1(dev)))
226 pr_info("SONIC ethernet @%08lx, MAC %pM, IRQ %d\n",
227 dev->base_addr, dev->dev_addr, dev->irq);
231 if ((err = register_netdev(dev)))
237 dma_free_coherent(lp->device,
238 SIZEOF_SONIC_DESC * SONIC_BUS_SCALE(lp->dma_bitmode),
239 lp->descriptors, lp->descriptors_laddr);
240 release_region(dev->base_addr, SONIC_MEM_SIZE);
247 MODULE_DESCRIPTION("Xtensa XT2000 SONIC ethernet driver");
251 static int xtsonic_device_remove(struct platform_device *pdev)
253 struct net_device *dev = platform_get_drvdata(pdev);
254 struct sonic_local *lp = netdev_priv(dev);
256 unregister_netdev(dev);
257 dma_free_coherent(lp->device,
258 SIZEOF_SONIC_DESC * SONIC_BUS_SCALE(lp->dma_bitmode),
259 lp->descriptors, lp->descriptors_laddr);
260 release_region (dev->base_addr, SONIC_MEM_SIZE);
266 static struct platform_driver xtsonic_driver = {
267 .probe = xtsonic_probe,
268 .remove = xtsonic_device_remove,
270 .name = xtsonic_string,
274 module_platform_driver(xtsonic_driver);