| /* |
| * 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 <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) |
| { |
| int retval; |
| |
| retval = request_irq(dev->irq, sonic_interrupt, IRQF_DISABLED, |
| "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_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) { |
| err = -ENOMEM; |
| 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 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 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); |