1 /* lasi_82596.c -- driver for the intel 82596 ethernet controller, as 2 munged into HPPA boxen . 3 4 This driver is based upon 82596.c, original credits are below... 5 but there were too many hoops which HP wants jumped through to 6 keep this code in there in a sane manner. 7 8 3 primary sources of the mess -- 9 1) hppa needs *lots* of cacheline flushing to keep this kind of 10 MMIO running. 11 12 2) The 82596 needs to see all of its pointers as their physical 13 address. Thus virt_to_bus/bus_to_virt are *everywhere*. 14 15 3) The implementation HP is using seems to be significantly pickier 16 about when and how the command and RX units are started. some 17 command ordering was changed. 18 19 Examination of the mach driver leads one to believe that there 20 might be a saner way to pull this off... anyone who feels like a 21 full rewrite can be my guest. 22 23 Split 02/13/2000 Sam Creasey (sammy@oh.verio.com) 24 25 02/01/2000 Initial modifications for parisc by Helge Deller (deller@gmx.de) 26 03/02/2000 changes for better/correct(?) cache-flushing (deller) 27 */ 28 29 /* 82596.c: A generic 82596 ethernet driver for linux. */ 30 /* 31 Based on Apricot.c 32 Written 1994 by Mark Evans. 33 This driver is for the Apricot 82596 bus-master interface 34 35 Modularised 12/94 Mark Evans 36 37 38 Modified to support the 82596 ethernet chips on 680x0 VME boards. 39 by Richard Hirst <richard@sleepie.demon.co.uk> 40 Renamed to be 82596.c 41 42 980825: Changed to receive directly in to sk_buffs which are 43 allocated at open() time. Eliminates copy on incoming frames 44 (small ones are still copied). Shared data now held in a 45 non-cached page, so we can run on 68060 in copyback mode. 46 47 TBD: 48 * look at deferring rx frames rather than discarding (as per tulip) 49 * handle tx ring full as per tulip 50 * performance test to tune rx_copybreak 51 52 Most of my modifications relate to the braindead big-endian 53 implementation by Intel. When the i596 is operating in 54 'big-endian' mode, it thinks a 32 bit value of 0x12345678 55 should be stored as 0x56781234. This is a real pain, when 56 you have linked lists which are shared by the 680x0 and the 57 i596. 58 59 Driver skeleton 60 Written 1993 by Donald Becker. 61 Copyright 1993 United States Government as represented by the Director, 62 National Security Agency. This software may only be used and distributed 63 according to the terms of the GNU General Public License as modified by SRC, 64 incorporated herein by reference. 65 66 The author may be reached as becker@scyld.com, or C/O 67 Scyld Computing Corporation, 410 Severn Ave., Suite 210, Annapolis MD 21403 68 69 */ 70 71 #include <linux/module.h> 72 #include <linux/kernel.h> 73 #include <linux/string.h> 74 #include <linux/ptrace.h> 75 #include <linux/errno.h> 76 #include <linux/ioport.h> 77 #include <linux/interrupt.h> 78 #include <linux/delay.h> 79 #include <linux/netdevice.h> 80 #include <linux/etherdevice.h> 81 #include <linux/skbuff.h> 82 #include <linux/types.h> 83 #include <linux/bitops.h> 84 #include <linux/dma-mapping.h> 85 86 #include <asm/io.h> 87 #include <asm/irq.h> 88 #include <asm/pdc.h> 89 #include <asm/parisc-device.h> 90 91 #define LASI_82596_DRIVER_VERSION "LASI 82596 driver - Revision: 1.30" 92 93 #define PA_I82596_RESET 0 /* Offsets relative to LASI-LAN-Addr.*/ 94 #define PA_CPU_PORT_L_ACCESS 4 95 #define PA_CHANNEL_ATTENTION 8 96 97 #define OPT_SWAP_PORT 0x0001 /* Need to wordswp on the MPU port */ 98 99 #define DMA_WBACK(ndev, addr, len) \ 100 do { dma_cache_sync((ndev)->dev.parent, (void *)addr, len, DMA_TO_DEVICE); } while (0) 101 102 #define DMA_INV(ndev, addr, len) \ 103 do { dma_cache_sync((ndev)->dev.parent, (void *)addr, len, DMA_FROM_DEVICE); } while (0) 104 105 #define DMA_WBACK_INV(ndev, addr, len) \ 106 do { dma_cache_sync((ndev)->dev.parent, (void *)addr, len, DMA_BIDIRECTIONAL); } while (0) 107 108 #define SYSBUS 0x0000006c 109 110 /* big endian CPU, 82596 "big" endian mode */ 111 #define SWAP32(x) (((u32)(x)<<16) | ((((u32)(x)))>>16)) 112 #define SWAP16(x) (x) 113 114 #include "lib82596.c" 115 116 MODULE_AUTHOR("Richard Hirst"); 117 MODULE_DESCRIPTION("i82596 driver"); 118 MODULE_LICENSE("GPL"); 119 module_param(i596_debug, int, 0); 120 MODULE_PARM_DESC(i596_debug, "lasi_82596 debug mask"); 121 122 static inline void ca(struct net_device *dev) 123 { 124 gsc_writel(0, dev->base_addr + PA_CHANNEL_ATTENTION); 125 } 126 127 128 static void mpu_port(struct net_device *dev, int c, dma_addr_t x) 129 { 130 struct i596_private *lp = netdev_priv(dev); 131 132 u32 v = (u32) (c) | (u32) (x); 133 u16 a, b; 134 135 if (lp->options & OPT_SWAP_PORT) { 136 a = v >> 16; 137 b = v & 0xffff; 138 } else { 139 a = v & 0xffff; 140 b = v >> 16; 141 } 142 143 gsc_writel(a, dev->base_addr + PA_CPU_PORT_L_ACCESS); 144 if (!running_on_qemu) 145 udelay(1); 146 gsc_writel(b, dev->base_addr + PA_CPU_PORT_L_ACCESS); 147 } 148 149 #define LAN_PROM_ADDR 0xF0810000 150 151 static int __init 152 lan_init_chip(struct parisc_device *dev) 153 { 154 struct net_device *netdevice; 155 struct i596_private *lp; 156 int retval; 157 int i; 158 159 if (!dev->irq) { 160 printk(KERN_ERR "%s: IRQ not found for i82596 at 0x%lx\n", 161 __FILE__, (unsigned long)dev->hpa.start); 162 return -ENODEV; 163 } 164 165 printk(KERN_INFO "Found i82596 at 0x%lx, IRQ %d\n", 166 (unsigned long)dev->hpa.start, dev->irq); 167 168 netdevice = alloc_etherdev(sizeof(struct i596_private)); 169 if (!netdevice) 170 return -ENOMEM; 171 SET_NETDEV_DEV(netdevice, &dev->dev); 172 parisc_set_drvdata (dev, netdevice); 173 174 netdevice->base_addr = dev->hpa.start; 175 netdevice->irq = dev->irq; 176 177 if (pdc_lan_station_id(netdevice->dev_addr, netdevice->base_addr)) { 178 for (i = 0; i < 6; i++) { 179 netdevice->dev_addr[i] = gsc_readb(LAN_PROM_ADDR + i); 180 } 181 printk(KERN_INFO 182 "%s: MAC of HP700 LAN read from EEPROM\n", __FILE__); 183 } 184 185 lp = netdev_priv(netdevice); 186 lp->options = dev->id.sversion == 0x72 ? OPT_SWAP_PORT : 0; 187 188 retval = i82596_probe(netdevice); 189 if (retval) { 190 free_netdev(netdevice); 191 return -ENODEV; 192 } 193 return retval; 194 } 195 196 static int __exit lan_remove_chip(struct parisc_device *pdev) 197 { 198 struct net_device *dev = parisc_get_drvdata(pdev); 199 struct i596_private *lp = netdev_priv(dev); 200 201 unregister_netdev (dev); 202 dma_free_attrs(&pdev->dev, sizeof(struct i596_private), lp->dma, 203 lp->dma_addr, DMA_ATTR_NON_CONSISTENT); 204 free_netdev (dev); 205 return 0; 206 } 207 208 static const struct parisc_device_id lan_tbl[] __initconst = { 209 { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x0008a }, 210 { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00072 }, 211 { 0, } 212 }; 213 214 MODULE_DEVICE_TABLE(parisc, lan_tbl); 215 216 static struct parisc_driver lan_driver __refdata = { 217 .name = "lasi_82596", 218 .id_table = lan_tbl, 219 .probe = lan_init_chip, 220 .remove = __exit_p(lan_remove_chip), 221 }; 222 223 static int lasi_82596_init(void) 224 { 225 printk(KERN_INFO LASI_82596_DRIVER_VERSION "\n"); 226 return register_parisc_driver(&lan_driver); 227 } 228 229 module_init(lasi_82596_init); 230 231 static void __exit lasi_82596_exit(void) 232 { 233 unregister_parisc_driver(&lan_driver); 234 } 235 236 module_exit(lasi_82596_exit); 237