xref: /titanic_51/usr/src/grub/grub-0.97/netboot/pnic.c (revision 791a814c934fcd4deb13b26c1f116ff283272a0d)
1 /**************************************************************************
2 Etherboot -  BOOTP/TFTP Bootstrap Program
3 Bochs Pseudo NIC driver for Etherboot
4 ***************************************************************************/
5 
6 /*
7  * This program is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU General Public License as
9  * published by the Free Software Foundation; either version 2, or (at
10  * your option) any later version.
11  *
12  * See pnic_api.h for an explanation of the Bochs Pseudo NIC.
13  */
14 
15 /* to get some global routines like printf */
16 #include "etherboot.h"
17 /* to get the interface to the body of the program */
18 #include "nic.h"
19 /* to get the PCI support functions, if this is a PCI NIC */
20 #include "pci.h"
21 
22 /* PNIC API */
23 #include "pnic_api.h"
24 
25 /* Private data structure */
26 typedef struct {
27 	uint16_t api_version;
28 } pnic_priv_data_t;
29 
30 /* Function prototypes */
31 static int pnic_api_check ( uint16_t api_version );
32 
33 /* NIC specific static variables go here */
34 static uint8_t tx_buffer[ETH_FRAME_LEN];
35 
36 /*
37  * Utility functions: issue a PNIC command, retrieve result.  Use
38  * pnic_command_quiet if you don't want failure codes to be
39  * automatically printed.  Returns the PNIC status code.
40  *
41  * Set output_length to NULL only if you expect to receive exactly
42  * output_max_length bytes, otherwise it'll complain that you didn't
43  * get enough data (on the assumption that if you not interested in
44  * discovering the output length then you're expecting a fixed amount
45  * of data).
46  */
47 
48 static uint16_t pnic_command_quiet ( struct nic *nic, uint16_t command,
49 				     void *input, uint16_t input_length,
50 				     void *output, uint16_t output_max_length,
51 				     uint16_t *output_length ) {
52 	int i;
53 	uint16_t status;
54 	uint16_t _output_length;
55 
56 	if ( input != NULL ) {
57 		/* Write input length */
58 		outw ( input_length, nic->ioaddr + PNIC_REG_LEN );
59 		/* Write input data */
60 		for ( i = 0; i < input_length; i++ ) {
61 			outb( ((char*)input)[i], nic->ioaddr + PNIC_REG_DATA );
62 		}
63 	}
64 	/* Write command */
65 	outw ( command, nic->ioaddr + PNIC_REG_CMD );
66 	/* Retrieve status */
67 	status = inw ( nic->ioaddr + PNIC_REG_STAT );
68 	/* Retrieve output length */
69 	_output_length = inw ( nic->ioaddr + PNIC_REG_LEN );
70 	if ( output_length == NULL ) {
71 		if ( _output_length != output_max_length ) {
72 			printf ( "pnic_command %#hx: wrong data length "
73 				 "returned (expected %d, got %d)\n", command,
74 				 output_max_length, _output_length );
75 		}
76 	} else {
77 		*output_length = _output_length;
78 	}
79 	if ( output != NULL ) {
80 		if ( _output_length > output_max_length ) {
81 			printf ( "pnic_command %#hx: output buffer too small "
82 				 "(have %d, need %d)\n", command,
83 				 output_max_length, _output_length );
84 			_output_length = output_max_length;
85 		}
86 		/* Retrieve output data */
87 		for ( i = 0; i < _output_length; i++ ) {
88 			((char*)output)[i] =
89 				inb ( nic->ioaddr + PNIC_REG_DATA );
90 		}
91 	}
92 	return status;
93 }
94 
95 static uint16_t pnic_command ( struct nic *nic, uint16_t command,
96 			       void *input, uint16_t input_length,
97 			       void *output, uint16_t output_max_length,
98 			       uint16_t *output_length ) {
99 	pnic_priv_data_t *priv = (pnic_priv_data_t*)nic->priv_data;
100 	uint16_t status = pnic_command_quiet ( nic, command,
101 					       input, input_length,
102 					       output, output_max_length,
103 					       output_length );
104 	if ( status == PNIC_STATUS_OK ) return status;
105 	printf ( "PNIC command %#hx (len %#hx) failed with status %#hx\n",
106 		 command, input_length, status );
107 	if ( priv->api_version ) pnic_api_check(priv->api_version);
108 	return status;
109 }
110 
111 /* Check API version matches that of NIC */
112 static int pnic_api_check ( uint16_t api_version ) {
113 	if ( api_version != PNIC_API_VERSION ) {
114 		printf ( "Warning: API version mismatch! "
115 			 "(NIC's is %d.%d, ours is %d.%d)\n",
116 			 api_version >> 8, api_version & 0xff,
117 			 PNIC_API_VERSION >> 8, PNIC_API_VERSION & 0xff );
118 	}
119 	if ( api_version < PNIC_API_VERSION ) {
120 		printf ( "*** You may need to update your copy of Bochs ***\n" );
121 	}
122 	return ( api_version == PNIC_API_VERSION );
123 }
124 
125 /**************************************************************************
126 POLL - Wait for a frame
127 ***************************************************************************/
128 static int pnic_poll(struct nic *nic, int retrieve)
129 {
130 	uint16_t length;
131 	uint16_t qlen;
132 
133 	/* Check receive queue length to see if there's anything to
134 	 * get.  Necessary since once we've called PNIC_CMD_RECV we
135 	 * have to read out the packet, otherwise it's lost forever.
136 	 */
137 	if ( pnic_command ( nic, PNIC_CMD_RECV_QLEN, NULL, 0,
138 			    &qlen, sizeof(qlen), NULL )
139 	     != PNIC_STATUS_OK ) return ( 0 );
140 	if ( qlen == 0 ) return ( 0 );
141 
142 	/* There is a packet ready.  Return 1 if we're only checking. */
143 	if ( ! retrieve ) return ( 1 );
144 
145 	/* Retrieve the packet */
146 	if ( pnic_command ( nic, PNIC_CMD_RECV, NULL, 0,
147 			    nic->packet, ETH_FRAME_LEN, &length )
148 	     != PNIC_STATUS_OK ) return ( 0 );
149 	nic->packetlen = length;
150 	return ( 1 );
151 }
152 
153 /**************************************************************************
154 TRANSMIT - Transmit a frame
155 ***************************************************************************/
156 static void pnic_transmit(
157 	struct nic *nic,
158 	const char *dest,		/* Destination */
159 	unsigned int type,		/* Type */
160 	unsigned int size,		/* size */
161 	const char *data)		/* Packet */
162 {
163 	unsigned int nstype = htons ( type );
164 
165 	if ( ( ETH_HLEN + size ) >= ETH_FRAME_LEN ) {
166 		printf ( "pnic_transmit: packet too large\n" );
167 		return;
168 	}
169 
170 	/* Assemble packet */
171 	memcpy ( tx_buffer, dest, ETH_ALEN );
172 	memcpy ( tx_buffer + ETH_ALEN, nic->node_addr, ETH_ALEN );
173 	memcpy ( tx_buffer + 2 * ETH_ALEN, &nstype, 2 );
174 	memcpy ( tx_buffer + ETH_HLEN, data, size );
175 
176 	pnic_command ( nic, PNIC_CMD_XMIT, tx_buffer, ETH_HLEN + size,
177 		       NULL, 0, NULL );
178 }
179 
180 /**************************************************************************
181 DISABLE - Turn off ethernet interface
182 ***************************************************************************/
183 static void pnic_disable(struct dev *dev)
184 {
185 	struct nic *nic = (struct nic *)dev;
186 	pnic_command ( nic, PNIC_CMD_RESET, NULL, 0, NULL, 0, NULL );
187 }
188 
189 /**************************************************************************
190 IRQ - Handle card interrupt status
191 ***************************************************************************/
192 static void pnic_irq ( struct nic *nic, irq_action_t action )
193 {
194 	uint8_t enabled;
195 
196 	switch ( action ) {
197 	case DISABLE :
198 	case ENABLE :
199 		enabled = ( action == ENABLE ? 1 : 0 );
200 		pnic_command ( nic, PNIC_CMD_MASK_IRQ,
201 			       &enabled, sizeof(enabled), NULL, 0, NULL );
202 		break;
203 	case FORCE :
204 		pnic_command ( nic, PNIC_CMD_FORCE_IRQ,
205 			       NULL, 0, NULL, 0, NULL );
206 		break;
207 	}
208 }
209 
210 /**************************************************************************
211 PROBE - Look for an adapter, this routine's visible to the outside
212 ***************************************************************************/
213 
214 static int pnic_probe(struct dev *dev, struct pci_device *pci)
215 {
216 	struct nic *nic = (struct nic *)dev;
217 	static pnic_priv_data_t priv;
218 	uint16_t status;
219 
220 	printf(" - ");
221 
222 	/* Clear private data structure and chain it in */
223 	memset ( &priv, 0, sizeof(priv) );
224 	nic->priv_data = &priv;
225 
226 	/* Mask the bit that says "this is an io addr" */
227 	nic->ioaddr = pci->ioaddr & ~3;
228 	nic->irqno = pci->irq;
229 	/* Not sure what this does, but the rtl8139 driver does it */
230 	adjust_pci_device(pci);
231 
232 	status = pnic_command_quiet( nic, PNIC_CMD_API_VER, NULL, 0,
233 				     &priv.api_version,
234 				     sizeof(priv.api_version), NULL );
235 	if ( status != PNIC_STATUS_OK ) {
236 		printf ( "PNIC failed installation check, code %#hx\n",
237 			 status );
238 		return 0;
239 	}
240 	pnic_api_check(priv.api_version);
241 	status = pnic_command ( nic, PNIC_CMD_READ_MAC, NULL, 0,
242 				nic->node_addr, ETH_ALEN, NULL );
243 	printf ( "Detected Bochs Pseudo NIC MAC %! (API v%d.%d) at %#hx\n",
244 		 nic->node_addr, priv.api_version>>8, priv.api_version&0xff,
245 		 nic->ioaddr );
246 
247 	/* point to NIC specific routines */
248 	dev->disable  = pnic_disable;
249 	nic->poll     = pnic_poll;
250 	nic->transmit = pnic_transmit;
251 	nic->irq      = pnic_irq;
252 	return 1;
253 }
254 
255 static struct pci_id pnic_nics[] = {
256 /* genrules.pl doesn't let us use macros for PCI IDs...*/
257 PCI_ROM(0xfefe, 0xefef, "pnic", "Bochs Pseudo NIC Adaptor"),
258 };
259 
260 struct pci_driver pnic_driver = {
261 	.type     = NIC_DRIVER,
262 	.name     = "PNIC",
263 	.probe    = pnic_probe,
264 	.ids      = pnic_nics,
265 	.id_count = sizeof(pnic_nics)/sizeof(pnic_nics[0]),
266 	.class    = 0,
267 };
268