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_ALLOC dma_alloc_noncoherent 100 #define DMA_FREE dma_free_noncoherent 101 #define DMA_WBACK(ndev, addr, len) \ 102 do { dma_cache_sync((ndev)->dev.parent, (void *)addr, len, DMA_TO_DEVICE); } while (0) 103 104 #define DMA_INV(ndev, addr, len) \ 105 do { dma_cache_sync((ndev)->dev.parent, (void *)addr, len, DMA_FROM_DEVICE); } while (0) 106 107 #define DMA_WBACK_INV(ndev, addr, len) \ 108 do { dma_cache_sync((ndev)->dev.parent, (void *)addr, len, DMA_BIDIRECTIONAL); } while (0) 109 110 #define SYSBUS 0x0000006c; 111 112 /* big endian CPU, 82596 "big" endian mode */ 113 #define SWAP32(x) (((u32)(x)<<16) | ((((u32)(x)))>>16)) 114 #define SWAP16(x) (x) 115 116 #include "lib82596.c" 117 118 MODULE_AUTHOR("Richard Hirst"); 119 MODULE_DESCRIPTION("i82596 driver"); 120 MODULE_LICENSE("GPL"); 121 module_param(i596_debug, int, 0); 122 MODULE_PARM_DESC(i596_debug, "lasi_82596 debug mask"); 123 124 static inline void ca(struct net_device *dev) 125 { 126 gsc_writel(0, dev->base_addr + PA_CHANNEL_ATTENTION); 127 } 128 129 130 static void mpu_port(struct net_device *dev, int c, dma_addr_t x) 131 { 132 struct i596_private *lp = netdev_priv(dev); 133 134 u32 v = (u32) (c) | (u32) (x); 135 u16 a, b; 136 137 if (lp->options & OPT_SWAP_PORT) { 138 a = v >> 16; 139 b = v & 0xffff; 140 } else { 141 a = v & 0xffff; 142 b = v >> 16; 143 } 144 145 gsc_writel(a, dev->base_addr + PA_CPU_PORT_L_ACCESS); 146 udelay(1); 147 gsc_writel(b, dev->base_addr + PA_CPU_PORT_L_ACCESS); 148 } 149 150 #define LAN_PROM_ADDR 0xF0810000 151 152 static int 153 lan_init_chip(struct parisc_device *dev) 154 { 155 struct net_device *netdevice; 156 struct i596_private *lp; 157 int retval; 158 int i; 159 160 if (!dev->irq) { 161 printk(KERN_ERR "%s: IRQ not found for i82596 at 0x%lx\n", 162 __FILE__, (unsigned long)dev->hpa.start); 163 return -ENODEV; 164 } 165 166 printk(KERN_INFO "Found i82596 at 0x%lx, IRQ %d\n", 167 (unsigned long)dev->hpa.start, dev->irq); 168 169 netdevice = alloc_etherdev(sizeof(struct i596_private)); 170 if (!netdevice) 171 return -ENOMEM; 172 SET_NETDEV_DEV(netdevice, &dev->dev); 173 parisc_set_drvdata (dev, netdevice); 174 175 netdevice->base_addr = dev->hpa.start; 176 netdevice->irq = dev->irq; 177 178 if (pdc_lan_station_id(netdevice->dev_addr, netdevice->base_addr)) { 179 for (i = 0; i < 6; i++) { 180 netdevice->dev_addr[i] = gsc_readb(LAN_PROM_ADDR + i); 181 } 182 printk(KERN_INFO 183 "%s: MAC of HP700 LAN read from EEPROM\n", __FILE__); 184 } 185 186 lp = netdev_priv(netdevice); 187 lp->options = dev->id.sversion == 0x72 ? OPT_SWAP_PORT : 0; 188 189 retval = i82596_probe(netdevice); 190 if (retval) { 191 free_netdev(netdevice); 192 return -ENODEV; 193 } 194 return retval; 195 } 196 197 static int lan_remove_chip(struct parisc_device *pdev) 198 { 199 struct net_device *dev = parisc_get_drvdata(pdev); 200 struct i596_private *lp = netdev_priv(dev); 201 202 unregister_netdev (dev); 203 DMA_FREE(&pdev->dev, sizeof(struct i596_private), 204 (void *)lp->dma, lp->dma_addr); 205 free_netdev (dev); 206 return 0; 207 } 208 209 static struct parisc_device_id lan_tbl[] = { 210 { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x0008a }, 211 { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00072 }, 212 { 0, } 213 }; 214 215 MODULE_DEVICE_TABLE(parisc, lan_tbl); 216 217 static struct parisc_driver lan_driver = { 218 .name = "lasi_82596", 219 .id_table = lan_tbl, 220 .probe = lan_init_chip, 221 .remove = lan_remove_chip, 222 }; 223 224 static int lasi_82596_init(void) 225 { 226 printk(KERN_INFO LASI_82596_DRIVER_VERSION "\n"); 227 return register_parisc_driver(&lan_driver); 228 } 229 230 module_init(lasi_82596_init); 231 232 static void __exit lasi_82596_exit(void) 233 { 234 unregister_parisc_driver(&lan_driver); 235 } 236 237 module_exit(lasi_82596_exit); 238