1 /* stnic.c : A SH7750 specific part of driver for NS DP83902A ST-NIC. 2 * 3 * This file is subject to the terms and conditions of the GNU General Public 4 * License. See the file "COPYING" in the main directory of this archive 5 * for more details. 6 * 7 * Copyright (C) 1999 kaz Kojima 8 */ 9 10 #include <linux/module.h> 11 #include <linux/kernel.h> 12 #include <linux/errno.h> 13 #include <linux/interrupt.h> 14 #include <linux/ioport.h> 15 #include <linux/netdevice.h> 16 #include <linux/etherdevice.h> 17 #include <linux/init.h> 18 #include <linux/delay.h> 19 20 #include <asm/io.h> 21 #include <mach-se/mach/se.h> 22 #include <asm/machvec.h> 23 #ifdef CONFIG_SH_STANDARD_BIOS 24 #include <asm/sh_bios.h> 25 #endif 26 27 #include "8390.h" 28 29 #define DRV_NAME "stnic" 30 31 #define byte unsigned char 32 #define half unsigned short 33 #define word unsigned int 34 #define vbyte volatile unsigned char 35 #define vhalf volatile unsigned short 36 #define vword volatile unsigned int 37 38 #define STNIC_RUN 0x01 /* 1 == Run, 0 == reset. */ 39 40 #define START_PG 0 /* First page of TX buffer */ 41 #define STOP_PG 128 /* Last page +1 of RX ring */ 42 43 /* Alias */ 44 #define STNIC_CR E8390_CMD 45 #define PG0_RSAR0 EN0_RSARLO 46 #define PG0_RSAR1 EN0_RSARHI 47 #define PG0_RBCR0 EN0_RCNTLO 48 #define PG0_RBCR1 EN0_RCNTHI 49 50 #define CR_RRD E8390_RREAD 51 #define CR_RWR E8390_RWRITE 52 #define CR_PG0 E8390_PAGE0 53 #define CR_STA E8390_START 54 #define CR_RDMA E8390_NODMA 55 56 /* FIXME! YOU MUST SET YOUR OWN ETHER ADDRESS. */ 57 static byte stnic_eadr[6] = 58 {0x00, 0xc0, 0x6e, 0x00, 0x00, 0x07}; 59 60 static struct net_device *stnic_dev; 61 62 static void stnic_reset (struct net_device *dev); 63 static void stnic_get_hdr (struct net_device *dev, struct e8390_pkt_hdr *hdr, 64 int ring_page); 65 static void stnic_block_input (struct net_device *dev, int count, 66 struct sk_buff *skb , int ring_offset); 67 static void stnic_block_output (struct net_device *dev, int count, 68 const unsigned char *buf, int start_page); 69 70 static void stnic_init (struct net_device *dev); 71 72 /* SH7750 specific read/write io. */ 73 static inline void 74 STNIC_DELAY (void) 75 { 76 vword trash; 77 trash = *(vword *) 0xa0000000; 78 trash = *(vword *) 0xa0000000; 79 trash = *(vword *) 0xa0000000; 80 } 81 82 static inline byte 83 STNIC_READ (int reg) 84 { 85 byte val; 86 87 val = (*(vhalf *) (PA_83902 + ((reg) << 1)) >> 8) & 0xff; 88 STNIC_DELAY (); 89 return val; 90 } 91 92 static inline void 93 STNIC_WRITE (int reg, byte val) 94 { 95 *(vhalf *) (PA_83902 + ((reg) << 1)) = ((half) (val) << 8); 96 STNIC_DELAY (); 97 } 98 99 static int __init stnic_probe(void) 100 { 101 struct net_device *dev; 102 int i, err; 103 104 /* If we are not running on a SolutionEngine, give up now */ 105 if (! MACH_SE) 106 return -ENODEV; 107 108 /* New style probing API */ 109 dev = alloc_ei_netdev(); 110 if (!dev) 111 return -ENOMEM; 112 113 #ifdef CONFIG_SH_STANDARD_BIOS 114 sh_bios_get_node_addr (stnic_eadr); 115 #endif 116 for (i = 0; i < ETH_ALEN; i++) 117 dev->dev_addr[i] = stnic_eadr[i]; 118 119 /* Set the base address to point to the NIC, not the "real" base! */ 120 dev->base_addr = 0x1000; 121 dev->irq = IRQ_STNIC; 122 dev->netdev_ops = &ei_netdev_ops; 123 124 /* Snarf the interrupt now. There's no point in waiting since we cannot 125 share and the board will usually be enabled. */ 126 err = request_irq (dev->irq, ei_interrupt, 0, DRV_NAME, dev); 127 if (err) { 128 printk (KERN_EMERG " unable to get IRQ %d.\n", dev->irq); 129 free_netdev(dev); 130 return err; 131 } 132 133 ei_status.name = dev->name; 134 ei_status.word16 = 1; 135 #ifdef __LITTLE_ENDIAN__ 136 ei_status.bigendian = 0; 137 #else 138 ei_status.bigendian = 1; 139 #endif 140 ei_status.tx_start_page = START_PG; 141 ei_status.rx_start_page = START_PG + TX_PAGES; 142 ei_status.stop_page = STOP_PG; 143 144 ei_status.reset_8390 = &stnic_reset; 145 ei_status.get_8390_hdr = &stnic_get_hdr; 146 ei_status.block_input = &stnic_block_input; 147 ei_status.block_output = &stnic_block_output; 148 149 stnic_init (dev); 150 151 err = register_netdev(dev); 152 if (err) { 153 free_irq(dev->irq, dev); 154 free_netdev(dev); 155 return err; 156 } 157 stnic_dev = dev; 158 159 printk (KERN_INFO "NS ST-NIC 83902A\n"); 160 161 return 0; 162 } 163 164 static void 165 stnic_reset (struct net_device *dev) 166 { 167 *(vhalf *) PA_83902_RST = 0; 168 udelay (5); 169 if (ei_debug > 1) 170 printk (KERN_WARNING "8390 reset done (%ld).\n", jiffies); 171 *(vhalf *) PA_83902_RST = ~0; 172 udelay (5); 173 } 174 175 static void 176 stnic_get_hdr (struct net_device *dev, struct e8390_pkt_hdr *hdr, 177 int ring_page) 178 { 179 half buf[2]; 180 181 STNIC_WRITE (PG0_RSAR0, 0); 182 STNIC_WRITE (PG0_RSAR1, ring_page); 183 STNIC_WRITE (PG0_RBCR0, 4); 184 STNIC_WRITE (PG0_RBCR1, 0); 185 STNIC_WRITE (STNIC_CR, CR_RRD | CR_PG0 | CR_STA); 186 187 buf[0] = *(vhalf *) PA_83902_IF; 188 STNIC_DELAY (); 189 buf[1] = *(vhalf *) PA_83902_IF; 190 STNIC_DELAY (); 191 hdr->next = buf[0] >> 8; 192 hdr->status = buf[0] & 0xff; 193 #ifdef __LITTLE_ENDIAN__ 194 hdr->count = buf[1]; 195 #else 196 hdr->count = ((buf[1] >> 8) & 0xff) | (buf[1] << 8); 197 #endif 198 199 if (ei_debug > 1) 200 printk (KERN_DEBUG "ring %x status %02x next %02x count %04x.\n", 201 ring_page, hdr->status, hdr->next, hdr->count); 202 203 STNIC_WRITE (STNIC_CR, CR_RDMA | CR_PG0 | CR_STA); 204 } 205 206 /* Block input and output, similar to the Crynwr packet driver. If you are 207 porting to a new ethercard look at the packet driver source for hints. 208 The HP LAN doesn't use shared memory -- we put the packet 209 out through the "remote DMA" dataport. */ 210 211 static void 212 stnic_block_input (struct net_device *dev, int length, struct sk_buff *skb, 213 int offset) 214 { 215 char *buf = skb->data; 216 half val; 217 218 STNIC_WRITE (PG0_RSAR0, offset & 0xff); 219 STNIC_WRITE (PG0_RSAR1, offset >> 8); 220 STNIC_WRITE (PG0_RBCR0, length & 0xff); 221 STNIC_WRITE (PG0_RBCR1, length >> 8); 222 STNIC_WRITE (STNIC_CR, CR_RRD | CR_PG0 | CR_STA); 223 224 if (length & 1) 225 length++; 226 227 while (length > 0) 228 { 229 val = *(vhalf *) PA_83902_IF; 230 #ifdef __LITTLE_ENDIAN__ 231 *buf++ = val & 0xff; 232 *buf++ = val >> 8; 233 #else 234 *buf++ = val >> 8; 235 *buf++ = val & 0xff; 236 #endif 237 STNIC_DELAY (); 238 length -= sizeof (half); 239 } 240 241 STNIC_WRITE (STNIC_CR, CR_RDMA | CR_PG0 | CR_STA); 242 } 243 244 static void 245 stnic_block_output (struct net_device *dev, int length, 246 const unsigned char *buf, int output_page) 247 { 248 STNIC_WRITE (PG0_RBCR0, 1); /* Write non-zero value */ 249 STNIC_WRITE (STNIC_CR, CR_RRD | CR_PG0 | CR_STA); 250 STNIC_DELAY (); 251 252 STNIC_WRITE (PG0_RBCR0, length & 0xff); 253 STNIC_WRITE (PG0_RBCR1, length >> 8); 254 STNIC_WRITE (PG0_RSAR0, 0); 255 STNIC_WRITE (PG0_RSAR1, output_page); 256 STNIC_WRITE (STNIC_CR, CR_RWR | CR_PG0 | CR_STA); 257 258 if (length & 1) 259 length++; 260 261 while (length > 0) 262 { 263 #ifdef __LITTLE_ENDIAN__ 264 *(vhalf *) PA_83902_IF = ((half) buf[1] << 8) | buf[0]; 265 #else 266 *(vhalf *) PA_83902_IF = ((half) buf[0] << 8) | buf[1]; 267 #endif 268 STNIC_DELAY (); 269 buf += sizeof (half); 270 length -= sizeof (half); 271 } 272 273 STNIC_WRITE (STNIC_CR, CR_RDMA | CR_PG0 | CR_STA); 274 } 275 276 /* This function resets the STNIC if something screws up. */ 277 static void 278 stnic_init (struct net_device *dev) 279 { 280 stnic_reset (dev); 281 NS8390_init (dev, 0); 282 } 283 284 static void __exit stnic_cleanup(void) 285 { 286 unregister_netdev(stnic_dev); 287 free_irq(stnic_dev->irq, stnic_dev); 288 free_netdev(stnic_dev); 289 } 290 291 module_init(stnic_probe); 292 module_exit(stnic_cleanup); 293 MODULE_LICENSE("GPL"); 294