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 u8 addr[ETH_ALEN]; 151 int i; 152 153 if (!dev->irq) { 154 printk(KERN_ERR "%s: IRQ not found for i82596 at 0x%lx\n", 155 __FILE__, (unsigned long)dev->hpa.start); 156 return -ENODEV; 157 } 158 159 printk(KERN_INFO "Found i82596 at 0x%lx, IRQ %d\n", 160 (unsigned long)dev->hpa.start, dev->irq); 161 162 netdevice = alloc_etherdev(sizeof(struct i596_private)); 163 if (!netdevice) 164 return -ENOMEM; 165 SET_NETDEV_DEV(netdevice, &dev->dev); 166 parisc_set_drvdata (dev, netdevice); 167 168 netdevice->base_addr = dev->hpa.start; 169 netdevice->irq = dev->irq; 170 171 if (pdc_lan_station_id(addr, netdevice->base_addr)) { 172 for (i = 0; i < 6; i++) { 173 addr[i] = gsc_readb(LAN_PROM_ADDR + i); 174 } 175 printk(KERN_INFO 176 "%s: MAC of HP700 LAN read from EEPROM\n", __FILE__); 177 } 178 eth_hw_addr_set(netdevice, addr); 179 180 lp = netdev_priv(netdevice); 181 lp->options = dev->id.sversion == 0x72 ? OPT_SWAP_PORT : 0; 182 lp->dma = dma_alloc_noncoherent(&dev->dev, 183 sizeof(struct i596_dma), &lp->dma_addr, 184 DMA_BIDIRECTIONAL, GFP_KERNEL); 185 if (!lp->dma) 186 goto out_free_netdev; 187 188 retval = i82596_probe(netdevice); 189 if (retval) 190 goto out_free_dma; 191 return 0; 192 193 out_free_dma: 194 dma_free_noncoherent(&dev->dev, sizeof(struct i596_dma), 195 lp->dma, lp->dma_addr, DMA_BIDIRECTIONAL); 196 out_free_netdev: 197 free_netdev(netdevice); 198 return retval; 199 } 200 201 static void __exit lan_remove_chip(struct parisc_device *pdev) 202 { 203 struct net_device *dev = parisc_get_drvdata(pdev); 204 struct i596_private *lp = netdev_priv(dev); 205 206 unregister_netdev (dev); 207 dma_free_noncoherent(&pdev->dev, sizeof(struct i596_private), lp->dma, 208 lp->dma_addr, DMA_BIDIRECTIONAL); 209 free_netdev (dev); 210 } 211 212 static const struct parisc_device_id lan_tbl[] __initconst = { 213 { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x0008a }, 214 { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00072 }, 215 { 0, } 216 }; 217 218 MODULE_DEVICE_TABLE(parisc, lan_tbl); 219 220 static struct parisc_driver lan_driver __refdata = { 221 .name = "lasi_82596", 222 .id_table = lan_tbl, 223 .probe = lan_init_chip, 224 .remove = __exit_p(lan_remove_chip), 225 }; 226 227 static int lasi_82596_init(void) 228 { 229 printk(KERN_INFO LASI_82596_DRIVER_VERSION "\n"); 230 return register_parisc_driver(&lan_driver); 231 } 232 233 module_init(lasi_82596_init); 234 235 static void __exit lasi_82596_exit(void) 236 { 237 unregister_parisc_driver(&lan_driver); 238 } 239 240 module_exit(lasi_82596_exit); 241