1 // SPDX-License-Identifier: GPL-2.0-only 2 /* stnic.c : A SH7750 specific part of driver for NS DP83902A ST-NIC. 3 * 4 * Copyright (C) 1999 kaz Kojima 5 */ 6 7 #include <linux/module.h> 8 #include <linux/kernel.h> 9 #include <linux/errno.h> 10 #include <linux/interrupt.h> 11 #include <linux/ioport.h> 12 #include <linux/netdevice.h> 13 #include <linux/etherdevice.h> 14 #include <linux/init.h> 15 #include <linux/delay.h> 16 17 #include <asm/io.h> 18 #include <mach-se/mach/se.h> 19 #include <asm/machvec.h> 20 #ifdef CONFIG_SH_STANDARD_BIOS 21 #include <asm/sh_bios.h> 22 #endif 23 24 #include "8390.h" 25 26 #define DRV_NAME "stnic" 27 28 #define byte unsigned char 29 #define half unsigned short 30 #define word unsigned int 31 #define vbyte volatile unsigned char 32 #define vhalf volatile unsigned short 33 #define vword volatile unsigned int 34 35 #define STNIC_RUN 0x01 /* 1 == Run, 0 == reset. */ 36 37 #define START_PG 0 /* First page of TX buffer */ 38 #define STOP_PG 128 /* Last page +1 of RX ring */ 39 40 /* Alias */ 41 #define STNIC_CR E8390_CMD 42 #define PG0_RSAR0 EN0_RSARLO 43 #define PG0_RSAR1 EN0_RSARHI 44 #define PG0_RBCR0 EN0_RCNTLO 45 #define PG0_RBCR1 EN0_RCNTHI 46 47 #define CR_RRD E8390_RREAD 48 #define CR_RWR E8390_RWRITE 49 #define CR_PG0 E8390_PAGE0 50 #define CR_STA E8390_START 51 #define CR_RDMA E8390_NODMA 52 53 /* FIXME! YOU MUST SET YOUR OWN ETHER ADDRESS. */ 54 static byte stnic_eadr[6] = 55 {0x00, 0xc0, 0x6e, 0x00, 0x00, 0x07}; 56 57 static struct net_device *stnic_dev; 58 59 static void stnic_reset (struct net_device *dev); 60 static void stnic_get_hdr (struct net_device *dev, struct e8390_pkt_hdr *hdr, 61 int ring_page); 62 static void stnic_block_input (struct net_device *dev, int count, 63 struct sk_buff *skb , int ring_offset); 64 static void stnic_block_output (struct net_device *dev, int count, 65 const unsigned char *buf, int start_page); 66 67 static void stnic_init (struct net_device *dev); 68 69 static u32 stnic_msg_enable; 70 71 module_param_named(msg_enable, stnic_msg_enable, uint, 0444); 72 MODULE_PARM_DESC(msg_enable, "Debug message level (see linux/netdevice.h for bitmap)"); 73 74 /* SH7750 specific read/write io. */ 75 static inline void 76 STNIC_DELAY (void) 77 { 78 vword trash; 79 trash = *(vword *) 0xa0000000; 80 trash = *(vword *) 0xa0000000; 81 trash = *(vword *) 0xa0000000; 82 } 83 84 static inline byte 85 STNIC_READ (int reg) 86 { 87 byte val; 88 89 val = (*(vhalf *) (PA_83902 + ((reg) << 1)) >> 8) & 0xff; 90 STNIC_DELAY (); 91 return val; 92 } 93 94 static inline void 95 STNIC_WRITE (int reg, byte val) 96 { 97 *(vhalf *) (PA_83902 + ((reg) << 1)) = ((half) (val) << 8); 98 STNIC_DELAY (); 99 } 100 101 static int __init stnic_probe(void) 102 { 103 struct net_device *dev; 104 struct ei_device *ei_local; 105 int err; 106 107 /* If we are not running on a SolutionEngine, give up now */ 108 if (! MACH_SE) 109 return -ENODEV; 110 111 /* New style probing API */ 112 dev = alloc_ei_netdev(); 113 if (!dev) 114 return -ENOMEM; 115 116 #ifdef CONFIG_SH_STANDARD_BIOS 117 sh_bios_get_node_addr (stnic_eadr); 118 #endif 119 eth_hw_addr_set(dev, stnic_eadr); 120 121 /* Set the base address to point to the NIC, not the "real" base! */ 122 dev->base_addr = 0x1000; 123 dev->irq = IRQ_STNIC; 124 dev->netdev_ops = &ei_netdev_ops; 125 126 /* Snarf the interrupt now. There's no point in waiting since we cannot 127 share and the board will usually be enabled. */ 128 err = request_irq (dev->irq, ei_interrupt, 0, DRV_NAME, dev); 129 if (err) { 130 netdev_emerg(dev, " unable to get IRQ %d.\n", dev->irq); 131 free_netdev(dev); 132 return err; 133 } 134 135 ei_status.name = dev->name; 136 ei_status.word16 = 1; 137 #ifdef __LITTLE_ENDIAN__ 138 ei_status.bigendian = 0; 139 #else 140 ei_status.bigendian = 1; 141 #endif 142 ei_status.tx_start_page = START_PG; 143 ei_status.rx_start_page = START_PG + TX_PAGES; 144 ei_status.stop_page = STOP_PG; 145 146 ei_status.reset_8390 = &stnic_reset; 147 ei_status.get_8390_hdr = &stnic_get_hdr; 148 ei_status.block_input = &stnic_block_input; 149 ei_status.block_output = &stnic_block_output; 150 151 stnic_init (dev); 152 ei_local = netdev_priv(dev); 153 ei_local->msg_enable = stnic_msg_enable; 154 155 err = register_netdev(dev); 156 if (err) { 157 free_irq(dev->irq, dev); 158 free_netdev(dev); 159 return err; 160 } 161 stnic_dev = dev; 162 163 netdev_info(dev, "NS ST-NIC 83902A\n"); 164 165 return 0; 166 } 167 168 static void 169 stnic_reset (struct net_device *dev) 170 { 171 struct ei_device *ei_local = netdev_priv(dev); 172 173 *(vhalf *) PA_83902_RST = 0; 174 udelay (5); 175 netif_warn(ei_local, hw, dev, "8390 reset done (%ld).\n", jiffies); 176 *(vhalf *) PA_83902_RST = ~0; 177 udelay (5); 178 } 179 180 static void 181 stnic_get_hdr (struct net_device *dev, struct e8390_pkt_hdr *hdr, 182 int ring_page) 183 { 184 struct ei_device *ei_local = netdev_priv(dev); 185 186 half buf[2]; 187 188 STNIC_WRITE (PG0_RSAR0, 0); 189 STNIC_WRITE (PG0_RSAR1, ring_page); 190 STNIC_WRITE (PG0_RBCR0, 4); 191 STNIC_WRITE (PG0_RBCR1, 0); 192 STNIC_WRITE (STNIC_CR, CR_RRD | CR_PG0 | CR_STA); 193 194 buf[0] = *(vhalf *) PA_83902_IF; 195 STNIC_DELAY (); 196 buf[1] = *(vhalf *) PA_83902_IF; 197 STNIC_DELAY (); 198 hdr->next = buf[0] >> 8; 199 hdr->status = buf[0] & 0xff; 200 #ifdef __LITTLE_ENDIAN__ 201 hdr->count = buf[1]; 202 #else 203 hdr->count = ((buf[1] >> 8) & 0xff) | (buf[1] << 8); 204 #endif 205 206 netif_dbg(ei_local, probe, dev, "ring %x status %02x next %02x count %04x.\n", 207 ring_page, hdr->status, hdr->next, hdr->count); 208 209 STNIC_WRITE (STNIC_CR, CR_RDMA | CR_PG0 | CR_STA); 210 } 211 212 /* Block input and output, similar to the Crynwr packet driver. If you are 213 porting to a new ethercard look at the packet driver source for hints. 214 The HP LAN doesn't use shared memory -- we put the packet 215 out through the "remote DMA" dataport. */ 216 217 static void 218 stnic_block_input (struct net_device *dev, int length, struct sk_buff *skb, 219 int offset) 220 { 221 char *buf = skb->data; 222 half val; 223 224 STNIC_WRITE (PG0_RSAR0, offset & 0xff); 225 STNIC_WRITE (PG0_RSAR1, offset >> 8); 226 STNIC_WRITE (PG0_RBCR0, length & 0xff); 227 STNIC_WRITE (PG0_RBCR1, length >> 8); 228 STNIC_WRITE (STNIC_CR, CR_RRD | CR_PG0 | CR_STA); 229 230 if (length & 1) 231 length++; 232 233 while (length > 0) 234 { 235 val = *(vhalf *) PA_83902_IF; 236 #ifdef __LITTLE_ENDIAN__ 237 *buf++ = val & 0xff; 238 *buf++ = val >> 8; 239 #else 240 *buf++ = val >> 8; 241 *buf++ = val & 0xff; 242 #endif 243 STNIC_DELAY (); 244 length -= sizeof (half); 245 } 246 247 STNIC_WRITE (STNIC_CR, CR_RDMA | CR_PG0 | CR_STA); 248 } 249 250 static void 251 stnic_block_output (struct net_device *dev, int length, 252 const unsigned char *buf, int output_page) 253 { 254 STNIC_WRITE (PG0_RBCR0, 1); /* Write non-zero value */ 255 STNIC_WRITE (STNIC_CR, CR_RRD | CR_PG0 | CR_STA); 256 STNIC_DELAY (); 257 258 STNIC_WRITE (PG0_RBCR0, length & 0xff); 259 STNIC_WRITE (PG0_RBCR1, length >> 8); 260 STNIC_WRITE (PG0_RSAR0, 0); 261 STNIC_WRITE (PG0_RSAR1, output_page); 262 STNIC_WRITE (STNIC_CR, CR_RWR | CR_PG0 | CR_STA); 263 264 if (length & 1) 265 length++; 266 267 while (length > 0) 268 { 269 #ifdef __LITTLE_ENDIAN__ 270 *(vhalf *) PA_83902_IF = ((half) buf[1] << 8) | buf[0]; 271 #else 272 *(vhalf *) PA_83902_IF = ((half) buf[0] << 8) | buf[1]; 273 #endif 274 STNIC_DELAY (); 275 buf += sizeof (half); 276 length -= sizeof (half); 277 } 278 279 STNIC_WRITE (STNIC_CR, CR_RDMA | CR_PG0 | CR_STA); 280 } 281 282 /* This function resets the STNIC if something screws up. */ 283 static void 284 stnic_init (struct net_device *dev) 285 { 286 stnic_reset (dev); 287 NS8390_init (dev, 0); 288 } 289 290 static void __exit stnic_cleanup(void) 291 { 292 unregister_netdev(stnic_dev); 293 free_irq(stnic_dev->irq, stnic_dev); 294 free_netdev(stnic_dev); 295 } 296 297 module_init(stnic_probe); 298 module_exit(stnic_cleanup); 299 MODULE_DESCRIPTION("National Semiconductor DP83902AV ethernet driver"); 300 MODULE_LICENSE("GPL"); 301