xref: /openbmc/linux/drivers/net/ethernet/8390/stnic.c (revision 9f07af05)
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
STNIC_DELAY(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
STNIC_READ(int reg)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
STNIC_WRITE(int reg,byte val)95 STNIC_WRITE (int reg, byte val)
96 {
97   *(vhalf *) (PA_83902 + ((reg) << 1)) = ((half) (val) << 8);
98   STNIC_DELAY ();
99 }
100 
stnic_probe(void)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
stnic_reset(struct net_device * dev)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
stnic_get_hdr(struct net_device * dev,struct e8390_pkt_hdr * hdr,int ring_page)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
stnic_block_input(struct net_device * dev,int length,struct sk_buff * skb,int offset)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
stnic_block_output(struct net_device * dev,int length,const unsigned char * buf,int output_page)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
stnic_init(struct net_device * dev)284 stnic_init (struct net_device *dev)
285 {
286   stnic_reset (dev);
287   NS8390_init (dev, 0);
288 }
289 
stnic_cleanup(void)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_LICENSE("GPL");
300