diff options
Diffstat (limited to 'drivers/net/ethernet/natsemi/xtsonic.c')
| -rw-r--r-- | drivers/net/ethernet/natsemi/xtsonic.c | 275 |
1 files changed, 275 insertions, 0 deletions
diff --git a/drivers/net/ethernet/natsemi/xtsonic.c b/drivers/net/ethernet/natsemi/xtsonic.c new file mode 100644 index 0000000000..52fef34d43 --- /dev/null +++ b/drivers/net/ethernet/natsemi/xtsonic.c @@ -0,0 +1,275 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * 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/gfp.h> +#include <linux/interrupt.h> +#include <linux/init.h> +#include <linux/ioport.h> +#include <linux/in.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 <linux/slab.h> +#include <linux/pgtable.h> + +#include <asm/io.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 + +/* + * 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) +{ + int retval; + + retval = request_irq(dev->irq, sonic_interrupt, 0, "sonic", dev); + if (retval) { + printk(KERN_ERR "%s: unable to get IRQ %d.\n", + dev->name, dev->irq); + return -EAGAIN; + } + + retval = sonic_open(dev); + if (retval) + free_irq(dev->irq, dev); + return retval; +} + +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_rx_mode = sonic_multicast_list, + .ndo_tx_timeout = sonic_tx_timeout, + .ndo_validate_addr = eth_validate_addr, + .ndo_set_mac_address = eth_mac_addr, +}; + +static int sonic_probe1(struct net_device *dev) +{ + unsigned int silicon_revision; + struct sonic_local *lp = netdev_priv(dev); + unsigned int base_addr = dev->base_addr; + int i; + int err = 0; + unsigned char addr[ETH_ALEN]; + + 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); + i = 0; + while ((known_revisions[i] != 0xffff) && + (known_revisions[i] != silicon_revision)) + i++; + + if (known_revisions[i] == 0xffff) { + pr_info("SONIC ethernet controller not found (0x%4x)\n", + silicon_revision); + return -ENODEV; + } + + /* + * 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); + addr[i*2] = val; + addr[i*2+1] = val >> 8; + } + eth_hw_addr_set(dev, addr); + + lp->dma_bitmode = SONIC_BITMODE32; + + err = sonic_alloc_descriptors(dev); + if (err) + goto out; + + 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 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; + platform_set_drvdata(pdev, dev); + SET_NETDEV_DEV(dev, &pdev->dev); + + dev->base_addr = resmem->start; + dev->irq = resirq->start; + + if ((err = sonic_probe1(dev))) + goto out; + + pr_info("SONIC ethernet @%08lx, MAC %pM, IRQ %d\n", + dev->base_addr, dev->dev_addr, dev->irq); + + sonic_msg_init(dev); + + if ((err = register_netdev(dev))) + goto undo_probe1; + + return 0; + +undo_probe1: + 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); +out: + free_netdev(dev); + + return err; +} + +MODULE_DESCRIPTION("Xtensa XT2000 SONIC ethernet driver"); + +#include "sonic.c" + +static int 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 = xtsonic_device_remove, + .driver = { + .name = xtsonic_string, + }, +}; + +module_platform_driver(xtsonic_driver); |