diff options
Diffstat (limited to 'drivers/net/ethernet/i825xx/lasi_82596.c')
| -rw-r--r-- | drivers/net/ethernet/i825xx/lasi_82596.c | 239 |
1 files changed, 239 insertions, 0 deletions
diff --git a/drivers/net/ethernet/i825xx/lasi_82596.c b/drivers/net/ethernet/i825xx/lasi_82596.c new file mode 100644 index 000000000..96c6f4f36 --- /dev/null +++ b/drivers/net/ethernet/i825xx/lasi_82596.c @@ -0,0 +1,239 @@ +/* lasi_82596.c -- driver for the intel 82596 ethernet controller, as + munged into HPPA boxen . + + This driver is based upon 82596.c, original credits are below... + but there were too many hoops which HP wants jumped through to + keep this code in there in a sane manner. + + 3 primary sources of the mess -- + 1) hppa needs *lots* of cacheline flushing to keep this kind of + MMIO running. + + 2) The 82596 needs to see all of its pointers as their physical + address. Thus virt_to_bus/bus_to_virt are *everywhere*. + + 3) The implementation HP is using seems to be significantly pickier + about when and how the command and RX units are started. some + command ordering was changed. + + Examination of the mach driver leads one to believe that there + might be a saner way to pull this off... anyone who feels like a + full rewrite can be my guest. + + Split 02/13/2000 Sam Creasey (sammy@oh.verio.com) + + 02/01/2000 Initial modifications for parisc by Helge Deller (deller@gmx.de) + 03/02/2000 changes for better/correct(?) cache-flushing (deller) +*/ + +/* 82596.c: A generic 82596 ethernet driver for linux. */ +/* + Based on Apricot.c + Written 1994 by Mark Evans. + This driver is for the Apricot 82596 bus-master interface + + Modularised 12/94 Mark Evans + + + Modified to support the 82596 ethernet chips on 680x0 VME boards. + by Richard Hirst <richard@sleepie.demon.co.uk> + Renamed to be 82596.c + + 980825: Changed to receive directly in to sk_buffs which are + allocated at open() time. Eliminates copy on incoming frames + (small ones are still copied). Shared data now held in a + non-cached page, so we can run on 68060 in copyback mode. + + TBD: + * look at deferring rx frames rather than discarding (as per tulip) + * handle tx ring full as per tulip + * performance test to tune rx_copybreak + + Most of my modifications relate to the braindead big-endian + implementation by Intel. When the i596 is operating in + 'big-endian' mode, it thinks a 32 bit value of 0x12345678 + should be stored as 0x56781234. This is a real pain, when + you have linked lists which are shared by the 680x0 and the + i596. + + Driver skeleton + Written 1993 by Donald Becker. + Copyright 1993 United States Government as represented by the Director, + National Security Agency. This software may only be used and distributed + according to the terms of the GNU General Public License as modified by SRC, + incorporated herein by reference. + + The author may be reached as becker@scyld.com, or C/O + Scyld Computing Corporation, 410 Severn Ave., Suite 210, Annapolis MD 21403 + + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/string.h> +#include <linux/ptrace.h> +#include <linux/errno.h> +#include <linux/ioport.h> +#include <linux/interrupt.h> +#include <linux/delay.h> +#include <linux/netdevice.h> +#include <linux/etherdevice.h> +#include <linux/skbuff.h> +#include <linux/types.h> +#include <linux/bitops.h> +#include <linux/dma-mapping.h> + +#include <asm/io.h> +#include <asm/irq.h> +#include <asm/pdc.h> +#include <asm/parisc-device.h> + +#define LASI_82596_DRIVER_VERSION "LASI 82596 driver - Revision: 1.30" + +#define PA_I82596_RESET 0 /* Offsets relative to LASI-LAN-Addr.*/ +#define PA_CPU_PORT_L_ACCESS 4 +#define PA_CHANNEL_ATTENTION 8 + +#define OPT_SWAP_PORT 0x0001 /* Need to wordswp on the MPU port */ + +#define SYSBUS 0x0000006c + +/* big endian CPU, 82596 "big" endian mode */ +#define SWAP32(x) (((u32)(x)<<16) | ((((u32)(x)))>>16)) +#define SWAP16(x) (x) + +#define NONCOHERENT_DMA 1 + +#include "lib82596.c" + +MODULE_AUTHOR("Richard Hirst"); +MODULE_DESCRIPTION("i82596 driver"); +MODULE_LICENSE("GPL"); +module_param(i596_debug, int, 0); +MODULE_PARM_DESC(i596_debug, "lasi_82596 debug mask"); + +static inline void ca(struct net_device *dev) +{ + gsc_writel(0, dev->base_addr + PA_CHANNEL_ATTENTION); +} + + +static void mpu_port(struct net_device *dev, int c, dma_addr_t x) +{ + struct i596_private *lp = netdev_priv(dev); + + u32 v = (u32) (c) | (u32) (x); + u16 a, b; + + if (lp->options & OPT_SWAP_PORT) { + a = v >> 16; + b = v & 0xffff; + } else { + a = v & 0xffff; + b = v >> 16; + } + + gsc_writel(a, dev->base_addr + PA_CPU_PORT_L_ACCESS); + if (!running_on_qemu) + udelay(1); + gsc_writel(b, dev->base_addr + PA_CPU_PORT_L_ACCESS); +} + +#define LAN_PROM_ADDR 0xF0810000 + +static int __init +lan_init_chip(struct parisc_device *dev) +{ + struct net_device *netdevice; + struct i596_private *lp; + int retval = -ENOMEM; + int i; + + if (!dev->irq) { + printk(KERN_ERR "%s: IRQ not found for i82596 at 0x%lx\n", + __FILE__, (unsigned long)dev->hpa.start); + return -ENODEV; + } + + printk(KERN_INFO "Found i82596 at 0x%lx, IRQ %d\n", + (unsigned long)dev->hpa.start, dev->irq); + + netdevice = alloc_etherdev(sizeof(struct i596_private)); + if (!netdevice) + return -ENOMEM; + SET_NETDEV_DEV(netdevice, &dev->dev); + parisc_set_drvdata (dev, netdevice); + + netdevice->base_addr = dev->hpa.start; + netdevice->irq = dev->irq; + + if (pdc_lan_station_id(netdevice->dev_addr, netdevice->base_addr)) { + for (i = 0; i < 6; i++) { + netdevice->dev_addr[i] = gsc_readb(LAN_PROM_ADDR + i); + } + printk(KERN_INFO + "%s: MAC of HP700 LAN read from EEPROM\n", __FILE__); + } + + lp = netdev_priv(netdevice); + lp->options = dev->id.sversion == 0x72 ? OPT_SWAP_PORT : 0; + lp->dma = dma_alloc_noncoherent(&dev->dev, + sizeof(struct i596_dma), &lp->dma_addr, + DMA_BIDIRECTIONAL, GFP_KERNEL); + if (!lp->dma) + goto out_free_netdev; + + retval = i82596_probe(netdevice); + if (retval) + goto out_free_dma; + return 0; + +out_free_dma: + dma_free_noncoherent(&dev->dev, sizeof(struct i596_dma), + lp->dma, lp->dma_addr, DMA_BIDIRECTIONAL); +out_free_netdev: + free_netdev(netdevice); + return retval; +} + +static int __exit lan_remove_chip(struct parisc_device *pdev) +{ + struct net_device *dev = parisc_get_drvdata(pdev); + struct i596_private *lp = netdev_priv(dev); + + unregister_netdev (dev); + dma_free_noncoherent(&pdev->dev, sizeof(struct i596_private), lp->dma, + lp->dma_addr, DMA_BIDIRECTIONAL); + free_netdev (dev); + return 0; +} + +static const struct parisc_device_id lan_tbl[] __initconst = { + { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x0008a }, + { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00072 }, + { 0, } +}; + +MODULE_DEVICE_TABLE(parisc, lan_tbl); + +static struct parisc_driver lan_driver __refdata = { + .name = "lasi_82596", + .id_table = lan_tbl, + .probe = lan_init_chip, + .remove = __exit_p(lan_remove_chip), +}; + +static int lasi_82596_init(void) +{ + printk(KERN_INFO LASI_82596_DRIVER_VERSION "\n"); + return register_parisc_driver(&lan_driver); +} + +module_init(lasi_82596_init); + +static void __exit lasi_82596_exit(void) +{ + unregister_parisc_driver(&lan_driver); +} + +module_exit(lasi_82596_exit); |