/* * xtsonic.c * * (C) 2001 - 2007 Tensilica Inc. * Kevin Chea <kchea@yahoo.com> * Marc Gauthier <marc@linux-xtensa.org> * Chris Zankel <chris@zankel.net> * * (C) 1996,1998 by Thomas Bogendoerfer (tsbogend@alpha.franken.de) * * This driver is based on work from Andreas Busse, but most of * the code is rewritten. * * (C) 1995 by Andreas Busse (andy@waldorf-gmbh.de) * * A driver for the onboard Sonic ethernet controller on the XT2000. */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/types.h> #include <linux/fcntl.h> #include <linux/interrupt.h> #include <linux/init.h> #include <linux/ioport.h> #include <linux/in.h> #include <linux/slab.h> #include <linux/string.h> #include <linux/delay.h> #include <linux/errno.h> #include <linux/netdevice.h> #include <linux/etherdevice.h> #include <linux/skbuff.h> #include <linux/platform_device.h> #include <linux/dma-mapping.h> #include <asm/io.h> #include <asm/pgtable.h> #include <asm/dma.h> static char xtsonic_string[] = "xtsonic"; extern unsigned xtboard_nvram_valid(void); extern void xtboard_get_ether_addr(unsigned char *buf); #include "sonic.h" /* * According to the documentation for the Sonic ethernet controller, * EOBC should be 760 words (1520 bytes) for 32-bit applications, and, * as such, 2 words less than the buffer size. The value for RBSIZE * defined in sonic.h, however is only 1520. * * (Note that in 16-bit configurations, EOBC is 759 words (1518 bytes) and * RBSIZE 1520 bytes) */ #undef SONIC_RBSIZE #define SONIC_RBSIZE 1524 /* * The chip provides 256 byte register space. */ #define SONIC_MEM_SIZE 0x100 /* * Macros to access SONIC registers */ #define SONIC_READ(reg) \ (0xffff & *((volatile unsigned int *)dev->base_addr+reg)) #define SONIC_WRITE(reg,val) \ *((volatile unsigned int *)dev->base_addr+reg) = val /* Use 0 for production, 1 for verification, and >2 for debug */ #ifdef SONIC_DEBUG static unsigned int sonic_debug = SONIC_DEBUG; #else static unsigned int sonic_debug = 1; #endif /* * We cannot use station (ethernet) address prefixes to detect the * sonic controller since these are board manufacturer depended. * So we check for known Silicon Revision IDs instead. */ static unsigned short known_revisions[] = { 0x101, /* SONIC 83934 */ 0xffff /* end of list */ }; static int xtsonic_open(struct net_device *dev) { if (request_irq(dev->irq,sonic_interrupt,IRQF_DISABLED,"sonic",dev)) { printk(KERN_ERR "%s: unable to get IRQ %d.\n", dev->name, dev->irq); return -EAGAIN; } return sonic_open(dev); } static int xtsonic_close(struct net_device *dev) { int err; err = sonic_close(dev); free_irq(dev->irq, dev); return err; } static const struct net_device_ops xtsonic_netdev_ops = { .ndo_open = xtsonic_open, .ndo_stop = xtsonic_close, .ndo_start_xmit = sonic_send_packet, .ndo_get_stats = sonic_get_stats, .ndo_set_multicast_list = sonic_multicast_list, .ndo_tx_timeout = sonic_tx_timeout, .ndo_validate_addr = eth_validate_addr, .ndo_change_mtu = eth_change_mtu, .ndo_set_mac_address = eth_mac_addr, }; static int __init sonic_probe1(struct net_device *dev) { static unsigned version_printed = 0; unsigned int silicon_revision; struct sonic_local *lp = netdev_priv(dev); unsigned int base_addr = dev->base_addr; int i; int err = 0; if (!request_mem_region(base_addr, 0x100, xtsonic_string)) return -EBUSY; /* * get the Silicon Revision ID. If this is one of the known * one assume that we found a SONIC ethernet controller at * the expected location. */ silicon_revision = SONIC_READ(SONIC_SR); if (sonic_debug > 1) printk("SONIC Silicon Revision = 0x%04x\n",silicon_revision); i = 0; while ((known_revisions[i] != 0xffff) && (known_revisions[i] != silicon_revision)) i++; if (known_revisions[i] == 0xffff) { printk("SONIC ethernet controller not found (0x%4x)\n", silicon_revision); return -ENODEV; } if (sonic_debug && version_printed++ == 0) printk(version); /* * Put the sonic into software reset, then retrieve ethernet address. * Note: we are assuming that the boot-loader has initialized the cam. */ SONIC_WRITE(SONIC_CMD,SONIC_CR_RST); SONIC_WRITE(SONIC_DCR, SONIC_DCR_WC0|SONIC_DCR_DW|SONIC_DCR_LBR|SONIC_DCR_SBUS); SONIC_WRITE(SONIC_CEP,0); SONIC_WRITE(SONIC_IMR,0); SONIC_WRITE(SONIC_CMD,SONIC_CR_RST); SONIC_WRITE(SONIC_CEP,0); for (i=0; i<3; i++) { unsigned int val = SONIC_READ(SONIC_CAP0-i); dev->dev_addr[i*2] = val; dev->dev_addr[i*2+1] = val >> 8; } /* Initialize the device structure. */ lp->dma_bitmode = SONIC_BITMODE32; /* * Allocate local private descriptor areas in uncached space. * The entire structure must be located within the same 64kb segment. * A simple way to ensure this is to allocate twice the * size of the structure -- given that the structure is * much less than 64 kB, at least one of the halves of * the allocated area will be contained entirely in 64 kB. * We also allocate extra space for a pointer to allow freeing * this structure later on (in xtsonic_cleanup_module()). */ lp->descriptors = dma_alloc_coherent(lp->device, SIZEOF_SONIC_DESC * SONIC_BUS_SCALE(lp->dma_bitmode), &lp->descriptors_laddr, GFP_KERNEL); if (lp->descriptors == NULL) { printk(KERN_ERR "%s: couldn't alloc DMA memory for " " descriptors.\n", dev_name(lp->device)); goto out; } lp->cda = lp->descriptors; lp->tda = lp->cda + (SIZEOF_SONIC_CDA * SONIC_BUS_SCALE(lp->dma_bitmode)); lp->rda = lp->tda + (SIZEOF_SONIC_TD * SONIC_NUM_TDS * SONIC_BUS_SCALE(lp->dma_bitmode)); lp->rra = lp->rda + (SIZEOF_SONIC_RD * SONIC_NUM_RDS * SONIC_BUS_SCALE(lp->dma_bitmode)); /* get the virtual dma address */ lp->cda_laddr = lp->descriptors_laddr; lp->tda_laddr = lp->cda_laddr + (SIZEOF_SONIC_CDA * SONIC_BUS_SCALE(lp->dma_bitmode)); lp->rda_laddr = lp->tda_laddr + (SIZEOF_SONIC_TD * SONIC_NUM_TDS * SONIC_BUS_SCALE(lp->dma_bitmode)); lp->rra_laddr = lp->rda_laddr + (SIZEOF_SONIC_RD * SONIC_NUM_RDS * SONIC_BUS_SCALE(lp->dma_bitmode)); dev->netdev_ops = &xtsonic_netdev_ops; dev->watchdog_timeo = TX_TIMEOUT; /* * clear tally counter */ SONIC_WRITE(SONIC_CRCT,0xffff); SONIC_WRITE(SONIC_FAET,0xffff); SONIC_WRITE(SONIC_MPT,0xffff); return 0; out: release_region(dev->base_addr, SONIC_MEM_SIZE); return err; } /* * Probe for a SONIC ethernet controller on an XT2000 board. * Actually probing is superfluous but we're paranoid. */ int __devinit xtsonic_probe(struct platform_device *pdev) { struct net_device *dev; struct sonic_local *lp; struct resource *resmem, *resirq; int err = 0; if ((resmem = platform_get_resource(pdev, IORESOURCE_MEM, 0)) == NULL) return -ENODEV; if ((resirq = platform_get_resource(pdev, IORESOURCE_IRQ, 0)) == NULL) return -ENODEV; if ((dev = alloc_etherdev(sizeof(struct sonic_local))) == NULL) return -ENOMEM; lp = netdev_priv(dev); lp->device = &pdev->dev; SET_NETDEV_DEV(dev, &pdev->dev); netdev_boot_setup_check(dev); dev->base_addr = resmem->start; dev->irq = resirq->start; if ((err = sonic_probe1(dev))) goto out; if ((err = register_netdev(dev))) goto out1; printk("%s: SONIC ethernet @%08lx, MAC %pM, IRQ %d\n", dev->name, dev->base_addr, dev->dev_addr, dev->irq); return 0; out1: release_region(dev->base_addr, SONIC_MEM_SIZE); out: free_netdev(dev); return err; } MODULE_DESCRIPTION("Xtensa XT2000 SONIC ethernet driver"); module_param(sonic_debug, int, 0); MODULE_PARM_DESC(sonic_debug, "xtsonic debug level (1-4)"); #include "sonic.c" static int __devexit xtsonic_device_remove (struct platform_device *pdev) { struct net_device *dev = platform_get_drvdata(pdev); struct sonic_local *lp = netdev_priv(dev); unregister_netdev(dev); dma_free_coherent(lp->device, SIZEOF_SONIC_DESC * SONIC_BUS_SCALE(lp->dma_bitmode), lp->descriptors, lp->descriptors_laddr); release_region (dev->base_addr, SONIC_MEM_SIZE); free_netdev(dev); return 0; } static struct platform_driver xtsonic_driver = { .probe = xtsonic_probe, .remove = __devexit_p(xtsonic_device_remove), .driver = { .name = xtsonic_string, }, }; static int __init xtsonic_init(void) { return platform_driver_register(&xtsonic_driver); } static void __exit xtsonic_cleanup(void) { platform_driver_unregister(&xtsonic_driver); } module_init(xtsonic_init); module_exit(xtsonic_cleanup);