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