1 // SPDX-License-Identifier: GPL-1.0+ 2 /* lasi_82596.c -- driver for the intel 82596 ethernet controller, as 3 munged into HPPA boxen . 4 5 This driver is based upon 82596.c, original credits are below... 6 but there were too many hoops which HP wants jumped through to 7 keep this code in there in a sane manner. 8 9 3 primary sources of the mess -- 10 1) hppa needs *lots* of cacheline flushing to keep this kind of 11 MMIO running. 12 13 2) The 82596 needs to see all of its pointers as their physical 14 address. Thus virt_to_bus/bus_to_virt are *everywhere*. 15 16 3) The implementation HP is using seems to be significantly pickier 17 about when and how the command and RX units are started. some 18 command ordering was changed. 19 20 Examination of the mach driver leads one to believe that there 21 might be a saner way to pull this off... anyone who feels like a 22 full rewrite can be my guest. 23 24 Split 02/13/2000 Sam Creasey (sammy@oh.verio.com) 25 26 02/01/2000 Initial modifications for parisc by Helge Deller (deller@gmx.de) 27 03/02/2000 changes for better/correct(?) cache-flushing (deller) 28 */ 29 30 /* 82596.c: A generic 82596 ethernet driver for linux. */ 31 /* 32 Based on Apricot.c 33 Written 1994 by Mark Evans. 34 This driver is for the Apricot 82596 bus-master interface 35 36 Modularised 12/94 Mark Evans 37 38 39 Modified to support the 82596 ethernet chips on 680x0 VME boards. 40 by Richard Hirst <richard@sleepie.demon.co.uk> 41 Renamed to be 82596.c 42 43 980825: Changed to receive directly in to sk_buffs which are 44 allocated at open() time. Eliminates copy on incoming frames 45 (small ones are still copied). Shared data now held in a 46 non-cached page, so we can run on 68060 in copyback mode. 47 48 TBD: 49 * look at deferring rx frames rather than discarding (as per tulip) 50 * handle tx ring full as per tulip 51 * performance test to tune rx_copybreak 52 53 Most of my modifications relate to the braindead big-endian 54 implementation by Intel. When the i596 is operating in 55 'big-endian' mode, it thinks a 32 bit value of 0x12345678 56 should be stored as 0x56781234. This is a real pain, when 57 you have linked lists which are shared by the 680x0 and the 58 i596. 59 60 Driver skeleton 61 Written 1993 by Donald Becker. 62 Copyright 1993 United States Government as represented by the Director, 63 National Security Agency. 64 65 The author may be reached as becker@scyld.com, or C/O 66 Scyld Computing Corporation, 410 Severn Ave., Suite 210, Annapolis MD 21403 67 68 */ 69 70 #include <linux/module.h> 71 #include <linux/kernel.h> 72 #include <linux/string.h> 73 #include <linux/ptrace.h> 74 #include <linux/errno.h> 75 #include <linux/ioport.h> 76 #include <linux/interrupt.h> 77 #include <linux/delay.h> 78 #include <linux/netdevice.h> 79 #include <linux/etherdevice.h> 80 #include <linux/skbuff.h> 81 #include <linux/types.h> 82 #include <linux/bitops.h> 83 #include <linux/dma-mapping.h> 84 85 #include <asm/io.h> 86 #include <asm/irq.h> 87 #include <asm/pdc.h> 88 #include <asm/parisc-device.h> 89 90 #define LASI_82596_DRIVER_VERSION "LASI 82596 driver - Revision: 1.30" 91 92 #define PA_I82596_RESET 0 /* Offsets relative to LASI-LAN-Addr.*/ 93 #define PA_CPU_PORT_L_ACCESS 4 94 #define PA_CHANNEL_ATTENTION 8 95 96 #define OPT_SWAP_PORT 0x0001 /* Need to wordswp on the MPU port */ 97 98 #define SYSBUS 0x0000006c 99 100 /* big endian CPU, 82596 "big" endian mode */ 101 #define SWAP32(x) (((u32)(x)<<16) | ((((u32)(x)))>>16)) 102 #define SWAP16(x) (x) 103 104 #define NONCOHERENT_DMA 1 105 106 #include "lib82596.c" 107 108 MODULE_AUTHOR("Richard Hirst"); 109 MODULE_DESCRIPTION("i82596 driver"); 110 MODULE_LICENSE("GPL"); 111 module_param(i596_debug, int, 0); 112 MODULE_PARM_DESC(i596_debug, "lasi_82596 debug mask"); 113 114 static inline void ca(struct net_device *dev) 115 { 116 gsc_writel(0, dev->base_addr + PA_CHANNEL_ATTENTION); 117 } 118 119 120 static void mpu_port(struct net_device *dev, int c, dma_addr_t x) 121 { 122 struct i596_private *lp = netdev_priv(dev); 123 124 u32 v = (u32) (c) | (u32) (x); 125 u16 a, b; 126 127 if (lp->options & OPT_SWAP_PORT) { 128 a = v >> 16; 129 b = v & 0xffff; 130 } else { 131 a = v & 0xffff; 132 b = v >> 16; 133 } 134 135 gsc_writel(a, dev->base_addr + PA_CPU_PORT_L_ACCESS); 136 if (!running_on_qemu) 137 udelay(1); 138 gsc_writel(b, dev->base_addr + PA_CPU_PORT_L_ACCESS); 139 } 140 141 #define LAN_PROM_ADDR 0xF0810000 142 143 static int __init 144 lan_init_chip(struct parisc_device *dev) 145 { 146 struct net_device *netdevice; 147 struct i596_private *lp; 148 int retval = -ENOMEM; 149 u8 addr[ETH_ALEN]; 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(addr, netdevice->base_addr)) { 171 for (i = 0; i < 6; i++) { 172 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 eth_hw_addr_set(netdevice, addr); 178 179 lp = netdev_priv(netdevice); 180 lp->options = dev->id.sversion == 0x72 ? OPT_SWAP_PORT : 0; 181 lp->dma = dma_alloc_noncoherent(&dev->dev, 182 sizeof(struct i596_dma), &lp->dma_addr, 183 DMA_BIDIRECTIONAL, GFP_KERNEL); 184 if (!lp->dma) 185 goto out_free_netdev; 186 187 retval = i82596_probe(netdevice); 188 if (retval) 189 goto out_free_dma; 190 return 0; 191 192 out_free_dma: 193 dma_free_noncoherent(&dev->dev, sizeof(struct i596_dma), 194 lp->dma, lp->dma_addr, DMA_BIDIRECTIONAL); 195 out_free_netdev: 196 free_netdev(netdevice); 197 return retval; 198 } 199 200 static void __exit lan_remove_chip(struct parisc_device *pdev) 201 { 202 struct net_device *dev = parisc_get_drvdata(pdev); 203 struct i596_private *lp = netdev_priv(dev); 204 205 unregister_netdev (dev); 206 dma_free_noncoherent(&pdev->dev, sizeof(struct i596_private), lp->dma, 207 lp->dma_addr, DMA_BIDIRECTIONAL); 208 free_netdev (dev); 209 } 210 211 static const struct parisc_device_id lan_tbl[] __initconst = { 212 { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x0008a }, 213 { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00072 }, 214 { 0, } 215 }; 216 217 MODULE_DEVICE_TABLE(parisc, lan_tbl); 218 219 static struct parisc_driver lan_driver __refdata = { 220 .name = "lasi_82596", 221 .id_table = lan_tbl, 222 .probe = lan_init_chip, 223 .remove = __exit_p(lan_remove_chip), 224 }; 225 226 static int lasi_82596_init(void) 227 { 228 printk(KERN_INFO LASI_82596_DRIVER_VERSION "\n"); 229 return register_parisc_driver(&lan_driver); 230 } 231 232 module_init(lasi_82596_init); 233 234 static void __exit lasi_82596_exit(void) 235 { 236 unregister_parisc_driver(&lan_driver); 237 } 238 239 module_exit(lasi_82596_exit); 240