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 SYSBUS 0x0000006c 100 101 /* big endian CPU, 82596 "big" endian mode */ 102 #define SWAP32(x) (((u32)(x)<<16) | ((((u32)(x)))>>16)) 103 #define SWAP16(x) (x) 104 105 #define NONCOHERENT_DMA 1 106 107 #include "lib82596.c" 108 109 MODULE_AUTHOR("Richard Hirst"); 110 MODULE_DESCRIPTION("i82596 driver"); 111 MODULE_LICENSE("GPL"); 112 module_param(i596_debug, int, 0); 113 MODULE_PARM_DESC(i596_debug, "lasi_82596 debug mask"); 114 115 static inline void ca(struct net_device *dev) 116 { 117 gsc_writel(0, dev->base_addr + PA_CHANNEL_ATTENTION); 118 } 119 120 121 static void mpu_port(struct net_device *dev, int c, dma_addr_t x) 122 { 123 struct i596_private *lp = netdev_priv(dev); 124 125 u32 v = (u32) (c) | (u32) (x); 126 u16 a, b; 127 128 if (lp->options & OPT_SWAP_PORT) { 129 a = v >> 16; 130 b = v & 0xffff; 131 } else { 132 a = v & 0xffff; 133 b = v >> 16; 134 } 135 136 gsc_writel(a, dev->base_addr + PA_CPU_PORT_L_ACCESS); 137 if (!running_on_qemu) 138 udelay(1); 139 gsc_writel(b, dev->base_addr + PA_CPU_PORT_L_ACCESS); 140 } 141 142 #define LAN_PROM_ADDR 0xF0810000 143 144 static int __init 145 lan_init_chip(struct parisc_device *dev) 146 { 147 struct net_device *netdevice; 148 struct i596_private *lp; 149 int retval = -ENOMEM; 150 int i; 151 152 if (!dev->irq) { 153 printk(KERN_ERR "%s: IRQ not found for i82596 at 0x%lx\n", 154 __FILE__, (unsigned long)dev->hpa.start); 155 return -ENODEV; 156 } 157 158 printk(KERN_INFO "Found i82596 at 0x%lx, IRQ %d\n", 159 (unsigned long)dev->hpa.start, dev->irq); 160 161 netdevice = alloc_etherdev(sizeof(struct i596_private)); 162 if (!netdevice) 163 return -ENOMEM; 164 SET_NETDEV_DEV(netdevice, &dev->dev); 165 parisc_set_drvdata (dev, netdevice); 166 167 netdevice->base_addr = dev->hpa.start; 168 netdevice->irq = dev->irq; 169 170 if (pdc_lan_station_id(netdevice->dev_addr, netdevice->base_addr)) { 171 for (i = 0; i < 6; i++) { 172 netdevice->dev_addr[i] = gsc_readb(LAN_PROM_ADDR + i); 173 } 174 printk(KERN_INFO 175 "%s: MAC of HP700 LAN read from EEPROM\n", __FILE__); 176 } 177 178 lp = netdev_priv(netdevice); 179 lp->options = dev->id.sversion == 0x72 ? OPT_SWAP_PORT : 0; 180 lp->dma = dma_alloc_noncoherent(&dev->dev, 181 sizeof(struct i596_dma), &lp->dma_addr, 182 DMA_BIDIRECTIONAL, GFP_KERNEL); 183 if (!lp->dma) 184 goto out_free_netdev; 185 186 retval = i82596_probe(netdevice); 187 if (retval) 188 goto out_free_dma; 189 return 0; 190 191 out_free_dma: 192 dma_free_noncoherent(&dev->dev, sizeof(struct i596_dma), 193 lp->dma, lp->dma_addr, DMA_BIDIRECTIONAL); 194 out_free_netdev: 195 free_netdev(netdevice); 196 return retval; 197 } 198 199 static void __exit lan_remove_chip(struct parisc_device *pdev) 200 { 201 struct net_device *dev = parisc_get_drvdata(pdev); 202 struct i596_private *lp = netdev_priv(dev); 203 204 unregister_netdev (dev); 205 dma_free_noncoherent(&pdev->dev, sizeof(struct i596_private), lp->dma, 206 lp->dma_addr, DMA_BIDIRECTIONAL); 207 free_netdev (dev); 208 } 209 210 static const struct parisc_device_id lan_tbl[] __initconst = { 211 { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x0008a }, 212 { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00072 }, 213 { 0, } 214 }; 215 216 MODULE_DEVICE_TABLE(parisc, lan_tbl); 217 218 static struct parisc_driver lan_driver __refdata = { 219 .name = "lasi_82596", 220 .id_table = lan_tbl, 221 .probe = lan_init_chip, 222 .remove = __exit_p(lan_remove_chip), 223 }; 224 225 static int lasi_82596_init(void) 226 { 227 printk(KERN_INFO LASI_82596_DRIVER_VERSION "\n"); 228 return register_parisc_driver(&lan_driver); 229 } 230 231 module_init(lasi_82596_init); 232 233 static void __exit lasi_82596_exit(void) 234 { 235 unregister_parisc_driver(&lan_driver); 236 } 237 238 module_exit(lasi_82596_exit); 239