1 // SPDX-License-Identifier: GPL-2.0-only 2 /* hplance.c : the Linux/hp300/lance ethernet driver 3 * 4 * Copyright (C) 05/1998 Peter Maydell <pmaydell@chiark.greenend.org.uk> 5 * Based on the Sun Lance driver and the NetBSD HP Lance driver 6 * Uses the generic 7990.c LANCE code. 7 */ 8 9 #include <linux/module.h> 10 #include <linux/kernel.h> 11 #include <linux/types.h> 12 #include <linux/interrupt.h> 13 #include <linux/ioport.h> 14 #include <linux/string.h> 15 #include <linux/delay.h> 16 #include <linux/init.h> 17 #include <linux/errno.h> 18 /* Used for the temporal inet entries and routing */ 19 #include <linux/socket.h> 20 #include <linux/route.h> 21 #include <linux/dio.h> 22 #include <linux/netdevice.h> 23 #include <linux/etherdevice.h> 24 #include <linux/skbuff.h> 25 26 #include <asm/io.h> 27 #include <asm/pgtable.h> 28 29 #include "hplance.h" 30 31 /* We have 16392 bytes of RAM for the init block and buffers. This places 32 * an upper limit on the number of buffers we can use. NetBSD uses 8 Rx 33 * buffers and 2 Tx buffers, it takes (8 + 2) * 1544 bytes. 34 */ 35 #define LANCE_LOG_TX_BUFFERS 1 36 #define LANCE_LOG_RX_BUFFERS 3 37 38 #include "7990.h" /* use generic LANCE code */ 39 40 /* Our private data structure */ 41 struct hplance_private { 42 struct lance_private lance; 43 }; 44 45 /* function prototypes... This is easy because all the grot is in the 46 * generic LANCE support. All we have to support is probing for boards, 47 * plus board-specific init, open and close actions. 48 * Oh, and we need to tell the generic code how to read and write LANCE registers... 49 */ 50 static int hplance_init_one(struct dio_dev *d, const struct dio_device_id *ent); 51 static void hplance_init(struct net_device *dev, struct dio_dev *d); 52 static void hplance_remove_one(struct dio_dev *d); 53 static void hplance_writerap(void *priv, unsigned short value); 54 static void hplance_writerdp(void *priv, unsigned short value); 55 static unsigned short hplance_readrdp(void *priv); 56 static int hplance_open(struct net_device *dev); 57 static int hplance_close(struct net_device *dev); 58 59 static struct dio_device_id hplance_dio_tbl[] = { 60 { DIO_ID_LAN }, 61 { 0 } 62 }; 63 64 static struct dio_driver hplance_driver = { 65 .name = "hplance", 66 .id_table = hplance_dio_tbl, 67 .probe = hplance_init_one, 68 .remove = hplance_remove_one, 69 }; 70 71 static const struct net_device_ops hplance_netdev_ops = { 72 .ndo_open = hplance_open, 73 .ndo_stop = hplance_close, 74 .ndo_start_xmit = lance_start_xmit, 75 .ndo_set_rx_mode = lance_set_multicast, 76 .ndo_validate_addr = eth_validate_addr, 77 .ndo_set_mac_address = eth_mac_addr, 78 #ifdef CONFIG_NET_POLL_CONTROLLER 79 .ndo_poll_controller = lance_poll, 80 #endif 81 }; 82 83 /* Find all the HP Lance boards and initialise them... */ 84 static int hplance_init_one(struct dio_dev *d, const struct dio_device_id *ent) 85 { 86 struct net_device *dev; 87 int err = -ENOMEM; 88 89 dev = alloc_etherdev(sizeof(struct hplance_private)); 90 if (!dev) 91 goto out; 92 93 err = -EBUSY; 94 if (!request_mem_region(dio_resource_start(d), 95 dio_resource_len(d), d->name)) 96 goto out_free_netdev; 97 98 hplance_init(dev, d); 99 err = register_netdev(dev); 100 if (err) 101 goto out_release_mem_region; 102 103 dio_set_drvdata(d, dev); 104 105 printk(KERN_INFO "%s: %s; select code %d, addr %pM, irq %d\n", 106 dev->name, d->name, d->scode, dev->dev_addr, d->ipl); 107 108 return 0; 109 110 out_release_mem_region: 111 release_mem_region(dio_resource_start(d), dio_resource_len(d)); 112 out_free_netdev: 113 free_netdev(dev); 114 out: 115 return err; 116 } 117 118 static void hplance_remove_one(struct dio_dev *d) 119 { 120 struct net_device *dev = dio_get_drvdata(d); 121 122 unregister_netdev(dev); 123 release_mem_region(dio_resource_start(d), dio_resource_len(d)); 124 free_netdev(dev); 125 } 126 127 /* Initialise a single lance board at the given DIO device */ 128 static void hplance_init(struct net_device *dev, struct dio_dev *d) 129 { 130 unsigned long va = (d->resource.start + DIO_VIRADDRBASE); 131 struct hplance_private *lp; 132 int i; 133 134 /* reset the board */ 135 out_8(va + DIO_IDOFF, 0xff); 136 udelay(100); /* ariba! ariba! udelay! udelay! */ 137 138 /* Fill the dev fields */ 139 dev->base_addr = va; 140 dev->netdev_ops = &hplance_netdev_ops; 141 dev->dma = 0; 142 143 for (i = 0; i < 6; i++) { 144 /* The NVRAM holds our ethernet address, one nibble per byte, 145 * at bytes NVRAMOFF+1,3,5,7,9... 146 */ 147 dev->dev_addr[i] = ((in_8(va + HPLANCE_NVRAMOFF + i*4 + 1) & 0xF) << 4) 148 | (in_8(va + HPLANCE_NVRAMOFF + i*4 + 3) & 0xF); 149 } 150 151 lp = netdev_priv(dev); 152 lp->lance.name = d->name; 153 lp->lance.base = va; 154 lp->lance.init_block = (struct lance_init_block *)(va + HPLANCE_MEMOFF); /* CPU addr */ 155 lp->lance.lance_init_block = NULL; /* LANCE addr of same RAM */ 156 lp->lance.busmaster_regval = LE_C3_BSWP; /* we're bigendian */ 157 lp->lance.irq = d->ipl; 158 lp->lance.writerap = hplance_writerap; 159 lp->lance.writerdp = hplance_writerdp; 160 lp->lance.readrdp = hplance_readrdp; 161 lp->lance.lance_log_rx_bufs = LANCE_LOG_RX_BUFFERS; 162 lp->lance.lance_log_tx_bufs = LANCE_LOG_TX_BUFFERS; 163 lp->lance.rx_ring_mod_mask = RX_RING_MOD_MASK; 164 lp->lance.tx_ring_mod_mask = TX_RING_MOD_MASK; 165 } 166 167 /* This is disgusting. We have to check the DIO status register for ack every 168 * time we read or write the LANCE registers. 169 */ 170 static void hplance_writerap(void *priv, unsigned short value) 171 { 172 struct lance_private *lp = (struct lance_private *)priv; 173 do { 174 out_be16(lp->base + HPLANCE_REGOFF + LANCE_RAP, value); 175 } while ((in_8(lp->base + HPLANCE_STATUS) & LE_ACK) == 0); 176 } 177 178 static void hplance_writerdp(void *priv, unsigned short value) 179 { 180 struct lance_private *lp = (struct lance_private *)priv; 181 do { 182 out_be16(lp->base + HPLANCE_REGOFF + LANCE_RDP, value); 183 } while ((in_8(lp->base + HPLANCE_STATUS) & LE_ACK) == 0); 184 } 185 186 static unsigned short hplance_readrdp(void *priv) 187 { 188 struct lance_private *lp = (struct lance_private *)priv; 189 __u16 value; 190 do { 191 value = in_be16(lp->base + HPLANCE_REGOFF + LANCE_RDP); 192 } while ((in_8(lp->base + HPLANCE_STATUS) & LE_ACK) == 0); 193 return value; 194 } 195 196 static int hplance_open(struct net_device *dev) 197 { 198 int status; 199 struct lance_private *lp = netdev_priv(dev); 200 201 status = lance_open(dev); /* call generic lance open code */ 202 if (status) 203 return status; 204 /* enable interrupts at board level. */ 205 out_8(lp->base + HPLANCE_STATUS, LE_IE); 206 207 return 0; 208 } 209 210 static int hplance_close(struct net_device *dev) 211 { 212 struct lance_private *lp = netdev_priv(dev); 213 214 out_8(lp->base + HPLANCE_STATUS, 0); /* disable interrupts at boardlevel */ 215 lance_close(dev); 216 return 0; 217 } 218 219 static int __init hplance_init_module(void) 220 { 221 return dio_register_driver(&hplance_driver); 222 } 223 224 static void __exit hplance_cleanup_module(void) 225 { 226 dio_unregister_driver(&hplance_driver); 227 } 228 229 module_init(hplance_init_module); 230 module_exit(hplance_cleanup_module); 231 232 MODULE_LICENSE("GPL"); 233