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1// SPDX-License-Identifier: GPL-2.02/*3 * xtsonic.c4 *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>9 *10 * (C) 1996,1998 by Thomas Bogendoerfer (tsbogend@alpha.franken.de)11 *12 * This driver is based on work from Andreas Busse, but most of13 * the code is rewritten.14 *15 * (C) 1995 by Andreas Busse (andy@waldorf-gmbh.de)16 *17 * A driver for the onboard Sonic ethernet controller on the XT2000.18 */19 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>28#include <linux/in.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>39 40#include <asm/io.h>41#include <asm/dma.h>42 43static char xtsonic_string[] = "xtsonic";44 45extern unsigned xtboard_nvram_valid(void);46extern void xtboard_get_ether_addr(unsigned char *buf);47 48#include "sonic.h"49 50/*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 RBSIZE54 * defined in sonic.h, however is only 1520.55 *56 * (Note that in 16-bit configurations, EOBC is 759 words (1518 bytes) and57 * RBSIZE 1520 bytes)58 */59#undef SONIC_RBSIZE60#define SONIC_RBSIZE 152461 62/*63 * The chip provides 256 byte register space.64 */65#define SONIC_MEM_SIZE 0x10066 67/*68 * Macros to access SONIC registers69 */70#define SONIC_READ(reg) \71 (0xffff & *((volatile unsigned int *)dev->base_addr+reg))72 73#define SONIC_WRITE(reg,val) \74 *((volatile unsigned int *)dev->base_addr+reg) = val75 76/*77 * We cannot use station (ethernet) address prefixes to detect the78 * sonic controller since these are board manufacturer depended.79 * So we check for known Silicon Revision IDs instead.80 */81static unsigned short known_revisions[] =82{83 0x101, /* SONIC 83934 */84 0xffff /* end of list */85};86 87static int xtsonic_open(struct net_device *dev)88{89 int retval;90 91 retval = request_irq(dev->irq, sonic_interrupt, 0, "sonic", dev);92 if (retval) {93 printk(KERN_ERR "%s: unable to get IRQ %d.\n",94 dev->name, dev->irq);95 return -EAGAIN;96 }97 98 retval = sonic_open(dev);99 if (retval)100 free_irq(dev->irq, dev);101 return retval;102}103 104static int xtsonic_close(struct net_device *dev)105{106 int err;107 err = sonic_close(dev);108 free_irq(dev->irq, dev);109 return err;110}111 112static 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,121};122 123static int sonic_probe1(struct net_device *dev)124{125 unsigned int silicon_revision;126 struct sonic_local *lp = netdev_priv(dev);127 unsigned int base_addr = dev->base_addr;128 int i;129 int err = 0;130 unsigned char addr[ETH_ALEN];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 known137 * one assume that we found a SONIC ethernet controller at138 * the expected location.139 */140 silicon_revision = SONIC_READ(SONIC_SR);141 i = 0;142 while ((known_revisions[i] != 0xffff) &&143 (known_revisions[i] != silicon_revision))144 i++;145 146 if (known_revisions[i] == 0xffff) {147 pr_info("SONIC ethernet controller not found (0x%4x)\n",148 silicon_revision);149 return -ENODEV;150 }151 152 /*153 * Put the sonic into software reset, then retrieve ethernet address.154 * Note: we are assuming that the boot-loader has initialized the cam.155 */156 SONIC_WRITE(SONIC_CMD,SONIC_CR_RST);157 SONIC_WRITE(SONIC_DCR,158 SONIC_DCR_WC0|SONIC_DCR_DW|SONIC_DCR_LBR|SONIC_DCR_SBUS);159 SONIC_WRITE(SONIC_CEP,0);160 SONIC_WRITE(SONIC_IMR,0);161 162 SONIC_WRITE(SONIC_CMD,SONIC_CR_RST);163 SONIC_WRITE(SONIC_CEP,0);164 165 for (i=0; i<3; i++) {166 unsigned int val = SONIC_READ(SONIC_CAP0-i);167 addr[i*2] = val;168 addr[i*2+1] = val >> 8;169 }170 eth_hw_addr_set(dev, addr);171 172 lp->dma_bitmode = SONIC_BITMODE32;173 174 err = sonic_alloc_descriptors(dev);175 if (err)176 goto out;177 178 dev->netdev_ops = &xtsonic_netdev_ops;179 dev->watchdog_timeo = TX_TIMEOUT;180 181 /*182 * clear tally counter183 */184 SONIC_WRITE(SONIC_CRCT,0xffff);185 SONIC_WRITE(SONIC_FAET,0xffff);186 SONIC_WRITE(SONIC_MPT,0xffff);187 188 return 0;189out:190 release_region(dev->base_addr, SONIC_MEM_SIZE);191 return err;192}193 194 195/*196 * Probe for a SONIC ethernet controller on an XT2000 board.197 * Actually probing is superfluous but we're paranoid.198 */199 200int xtsonic_probe(struct platform_device *pdev)201{202 struct net_device *dev;203 struct sonic_local *lp;204 struct resource *resmem, *resirq;205 int err = 0;206 207 if ((resmem = platform_get_resource(pdev, IORESOURCE_MEM, 0)) == NULL)208 return -ENODEV;209 210 if ((resirq = platform_get_resource(pdev, IORESOURCE_IRQ, 0)) == NULL)211 return -ENODEV;212 213 if ((dev = alloc_etherdev(sizeof(struct sonic_local))) == NULL)214 return -ENOMEM;215 216 lp = netdev_priv(dev);217 lp->device = &pdev->dev;218 platform_set_drvdata(pdev, dev);219 SET_NETDEV_DEV(dev, &pdev->dev);220 221 dev->base_addr = resmem->start;222 dev->irq = resirq->start;223 224 if ((err = sonic_probe1(dev)))225 goto out;226 227 pr_info("SONIC ethernet @%08lx, MAC %pM, IRQ %d\n",228 dev->base_addr, dev->dev_addr, dev->irq);229 230 sonic_msg_init(dev);231 232 if ((err = register_netdev(dev)))233 goto undo_probe1;234 235 return 0;236 237undo_probe1:238 dma_free_coherent(lp->device,239 SIZEOF_SONIC_DESC * SONIC_BUS_SCALE(lp->dma_bitmode),240 lp->descriptors, lp->descriptors_laddr);241 release_region(dev->base_addr, SONIC_MEM_SIZE);242out:243 free_netdev(dev);244 245 return err;246}247 248MODULE_DESCRIPTION("Xtensa XT2000 SONIC ethernet driver");249 250#include "sonic.c"251 252static void xtsonic_device_remove(struct platform_device *pdev)253{254 struct net_device *dev = platform_get_drvdata(pdev);255 struct sonic_local *lp = netdev_priv(dev);256 257 unregister_netdev(dev);258 dma_free_coherent(lp->device,259 SIZEOF_SONIC_DESC * SONIC_BUS_SCALE(lp->dma_bitmode),260 lp->descriptors, lp->descriptors_laddr);261 release_region (dev->base_addr, SONIC_MEM_SIZE);262 free_netdev(dev);263}264 265static struct platform_driver xtsonic_driver = {266 .probe = xtsonic_probe,267 .remove_new = xtsonic_device_remove,268 .driver = {269 .name = xtsonic_string,270 },271};272 273module_platform_driver(xtsonic_driver);274