[16a384cf] | 1 | /* ne2k.c -- RTEMS NE2000 Ethernet driver. |
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| 2 | * Written by Ian Lance Taylor, Zembu Labs. |
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| 3 | * October, 1998. |
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| 4 | * |
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| 5 | * The license and distribution terms for this file may be |
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[3e8cdf8] | 6 | * found in the file LICENSE in this distribution or at |
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[e61df10] | 7 | * http://www.rtems.com/license/LICENSE. |
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[16a384cf] | 8 | * |
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| 9 | * $Id$ |
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| 10 | * |
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| 11 | * Both the ne2000 and the wd80x3 are based on the National Semiconductor |
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| 12 | * 8390 chip, so there is a fair amount of overlap between the two |
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| 13 | * drivers. It would be possible in principle to combine some code into |
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| 14 | * a separate set of subroutines called by both. In fact, the drivers in |
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| 15 | * both OpenBSD and Linux work this way. I didn't bother, because for |
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| 16 | * the relatively simple drivers used by RTEMS, the overlap is not |
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| 17 | * especially large, and any reasonable use of subroutines would lead to |
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| 18 | * slightly less efficient code. |
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| 19 | |
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| 20 | * This ne2000 driver uses two transmit buffers. While one packet is |
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| 21 | * being transmitted over the Ethernet, RTEMS will upload another. Since |
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| 22 | * uploading a packet to the ne2000 is rather slow, I don't think there |
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| 23 | * is any point to having more than two transmit buffers. However, the |
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| 24 | * code does make it possible, by changing NE_TX_BUFS, although that |
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| 25 | * would of course reduce the number of receive buffers. |
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[6128a4a] | 26 | * |
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[16a384cf] | 27 | * I suspect that the wd80x3 driver would benefit slightly from copying |
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| 28 | * the multiple transmit buffer code. However, I have no way to test |
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| 29 | * that. |
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| 30 | */ |
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| 31 | |
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| 32 | #include <bsp.h> |
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| 33 | #include <wd80x3.h> |
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| 34 | |
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| 35 | #include <stdio.h> |
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| 36 | #include <assert.h> |
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| 37 | |
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| 38 | #include <rtems/error.h> |
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| 39 | #include <rtems/rtems_bsdnet.h> |
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| 40 | |
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| 41 | #include <sys/param.h> |
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| 42 | #include <sys/mbuf.h> |
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| 43 | #include <sys/socket.h> |
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| 44 | #include <sys/sockio.h> |
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[c140041b] | 45 | #include <errno.h> |
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[16a384cf] | 46 | |
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| 47 | #include <net/if.h> |
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| 48 | |
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| 49 | #include <netinet/in.h> |
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| 50 | #include <netinet/if_ether.h> |
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| 51 | |
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[48ad38db] | 52 | #include <bsp/irq.h> |
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[16a384cf] | 53 | |
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| 54 | /* Define this to force byte-wide data transfers with the NIC. This |
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| 55 | is needed for boards like the TS-1325 386EX PC, which support only |
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| 56 | an 8-bit PC/104 bus. Undefine this on a normal PC.*/ |
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| 57 | |
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| 58 | /* #define NE2000_BYTE_TRANSFERS */ |
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| 59 | |
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| 60 | /* Define this to print debugging messages with printk. */ |
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| 61 | |
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| 62 | /* #define DEBUG_NE2000 */ |
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| 63 | |
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| 64 | /* We expect to be able to read a complete packet into an mbuf. */ |
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| 65 | |
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| 66 | #if (MCLBYTES < 1520) |
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| 67 | # error "Driver must have MCLBYTES >= 1520" |
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| 68 | #endif |
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| 69 | |
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| 70 | /* The 8390 macro definitions in wd80x3.h expect RO to be defined. */ |
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| 71 | #define RO 0 |
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| 72 | |
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| 73 | /* Minimum size of Ethernet packet. */ |
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| 74 | #define ET_MINLEN 60 |
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| 75 | |
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| 76 | /* The number of NE2000 devices supported by this driver. */ |
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| 77 | |
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| 78 | #define NNEDRIVER 1 |
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| 79 | |
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| 80 | /* RTEMS event number used by the interrupt handler to signal the |
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| 81 | driver task. This must not be any of the events used by the |
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| 82 | network task synchronization. */ |
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| 83 | #define INTERRUPT_EVENT RTEMS_EVENT_1 |
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| 84 | |
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| 85 | /* RTEMS event number used to start the transmit daemon. This must |
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| 86 | not be the same as INTERRUPT_EVENT. */ |
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| 87 | #define START_TRANSMIT_EVENT RTEMS_EVENT_2 |
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| 88 | |
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| 89 | /* Interrupts we want to handle from the device. */ |
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| 90 | |
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| 91 | #define NE_INTERRUPTS \ |
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| 92 | (MSK_PRX | MSK_PTX | MSK_RXE | MSK_TXE | MSK_OVW | MSK_CNT) |
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| 93 | |
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| 94 | /* The size of a page in device memory. */ |
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| 95 | |
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| 96 | #define NE_PAGE_SIZE (256) |
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| 97 | |
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| 98 | /* The first page address in device memory. */ |
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| 99 | |
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| 100 | #define NE_START_PAGE (0x40) |
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| 101 | |
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| 102 | /* The last page address, plus 1. */ |
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| 103 | |
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| 104 | #define NE_STOP_PAGE (0x80) |
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| 105 | |
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| 106 | /* The number of pages used for a single transmit buffer. This is |
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| 107 | 1536 bytes, enough for a full size packet. */ |
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| 108 | |
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| 109 | #define NE_TX_PAGES (6) |
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| 110 | |
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| 111 | /* The number of transmit buffers. We use two, so we can load one |
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| 112 | packet while the other is being sent. */ |
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| 113 | |
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| 114 | #define NE_TX_BUFS (2) |
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| 115 | |
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| 116 | /* We use the first pages in memory as transmit buffers, and the |
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| 117 | remaining ones as receive buffers. */ |
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| 118 | |
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| 119 | #define NE_FIRST_TX_PAGE (NE_START_PAGE) |
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| 120 | |
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| 121 | #define NE_FIRST_RX_PAGE (NE_FIRST_TX_PAGE + NE_TX_PAGES * NE_TX_BUFS) |
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| 122 | |
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| 123 | /* Data we store for each NE2000 device. */ |
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| 124 | |
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| 125 | struct ne_softc { |
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| 126 | /* The bsdnet information structure. */ |
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| 127 | struct arpcom arpcom; |
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| 128 | |
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| 129 | /* The interrupt request number. */ |
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| 130 | unsigned int irno; |
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| 131 | /* The base IO port number. */ |
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| 132 | unsigned int port; |
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| 133 | |
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| 134 | /* Whether we accept broadcasts. */ |
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| 135 | int accept_broadcasts; |
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| 136 | |
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| 137 | /* The thread ID of the transmit task. */ |
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| 138 | rtems_id tx_daemon_tid; |
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| 139 | /* The thread ID of the receive task. */ |
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| 140 | rtems_id rx_daemon_tid; |
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| 141 | |
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| 142 | /* Whether we use byte-transfers with the device. */ |
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[57bc54dc] | 143 | bool byte_transfers; |
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[16a384cf] | 144 | |
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| 145 | /* The number of memory buffers which the transmit daemon has loaded |
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| 146 | with data to be sent, but which have not yet been completely |
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| 147 | sent. */ |
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| 148 | int inuse; |
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| 149 | /* The index of the next available transmit memory buffer. */ |
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| 150 | int nextavail; |
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| 151 | /* The index of the next transmit buffer to send. */ |
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| 152 | int nextsend; |
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| 153 | /* Nonzero if the device is currently transmitting a packet. */ |
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| 154 | int transmitting; |
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| 155 | /* The length of the data stored in each transmit buffer. */ |
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| 156 | int sendlen[NE_TX_BUFS]; |
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| 157 | |
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| 158 | /* Set if we have a packet overrun while receiving. */ |
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| 159 | int overrun; |
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| 160 | /* Set if we should resend after an overrun. */ |
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| 161 | int resend; |
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| 162 | |
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| 163 | /* Statistics. */ |
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| 164 | struct { |
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| 165 | /* Number of packets received. */ |
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| 166 | unsigned long rx_packets; |
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| 167 | /* Number of packets sent. */ |
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| 168 | unsigned long tx_packets; |
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| 169 | /* Number of interrupts. */ |
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| 170 | unsigned long interrupts; |
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| 171 | /* Number of receive acknowledgements. */ |
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| 172 | unsigned long rx_acks; |
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| 173 | /* Number of transmit acknowledgements. */ |
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| 174 | unsigned long tx_acks; |
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| 175 | /* Number of packet overruns. */ |
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| 176 | unsigned long overruns; |
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| 177 | /* Number of frame errors. */ |
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| 178 | unsigned long rx_frame_errors; |
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| 179 | /* Number of CRC errors. */ |
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| 180 | unsigned long rx_crc_errors; |
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| 181 | /* Number of missed packets. */ |
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| 182 | unsigned long rx_missed_errors; |
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| 183 | } stats; |
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| 184 | }; |
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| 185 | |
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| 186 | /* The list of NE2000 devices on this system. */ |
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| 187 | |
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| 188 | static struct ne_softc ne_softc[NNEDRIVER]; |
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| 189 | |
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| 190 | /* Find the NE2000 device which is attached at a particular interrupt |
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| 191 | vector. */ |
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| 192 | |
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| 193 | static struct ne_softc * |
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| 194 | ne_device_for_irno (int irno) |
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| 195 | { |
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| 196 | int i; |
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| 197 | |
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| 198 | for (i = 0; i < NNEDRIVER; ++i) |
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| 199 | { |
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| 200 | if (ne_softc[i].irno == irno |
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| 201 | && ne_softc[i].arpcom.ac_if.if_softc != NULL) |
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| 202 | return &ne_softc[i]; |
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| 203 | } |
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| 204 | |
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| 205 | return NULL; |
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| 206 | } |
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| 207 | |
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| 208 | /* Read data from an NE2000 device. Read LEN bytes at ADDR, storing |
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| 209 | them into P. */ |
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| 210 | |
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| 211 | static void |
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| 212 | ne_read_data (struct ne_softc *sc, int addr, int len, unsigned char *p) |
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| 213 | { |
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| 214 | unsigned int port = sc->port; |
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| 215 | unsigned int dport = port + DATAPORT; |
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| 216 | |
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| 217 | outport_byte (port + CMDR, MSK_PG0 | MSK_RD2 | MSK_STA); |
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| 218 | outport_byte (port + RBCR0, len); |
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| 219 | outport_byte (port + RBCR1, len >> 8); |
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| 220 | outport_byte (port + RSAR0, addr); |
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| 221 | outport_byte (port + RSAR1, addr >> 8); |
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| 222 | outport_byte (port + CMDR, MSK_PG0 | MSK_RRE | MSK_STA); |
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| 223 | |
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| 224 | if (sc->byte_transfers) |
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| 225 | while (len > 0) { |
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| 226 | unsigned char d; |
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[6128a4a] | 227 | |
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[16a384cf] | 228 | inport_byte (dport, d); |
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| 229 | *p++ = d; |
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| 230 | len--; |
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| 231 | } |
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| 232 | else /* word transfers */ |
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| 233 | while (len > 0) { |
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| 234 | unsigned short d; |
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[6128a4a] | 235 | |
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[16a384cf] | 236 | inport_word (dport, d); |
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| 237 | *p++ = d; |
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| 238 | *p++ = d >> 8; |
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| 239 | len -= 2; |
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| 240 | } |
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| 241 | |
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| 242 | outport_byte (port + ISR, MSK_RDC); |
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| 243 | } |
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| 244 | |
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| 245 | /* Handle the current NE2000 status. This is called when the device |
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| 246 | signals an interrupt. It is also called at other times while |
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| 247 | NE2000 interrupts have been disabled. */ |
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| 248 | |
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| 249 | static void |
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| 250 | ne_check_status (struct ne_softc *sc) |
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| 251 | { |
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| 252 | unsigned int port = sc->port; |
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| 253 | unsigned char status; |
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| 254 | |
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| 255 | /* It seems that we need to use a loop here, because if the NE2000 |
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| 256 | signals an interrupt because packet transmission is complete, and |
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| 257 | then receives a packet while interrupts are disabled, it seems to |
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| 258 | sometimes fail to signal the interrupt for the received packet |
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| 259 | when interrupts are reenabled. (Based on the behaviour of the |
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| 260 | Realtek 8019AS chip). */ |
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| 261 | |
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| 262 | while (1) { |
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| 263 | inport_byte (port + ISR, status); |
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| 264 | if (status == 0) |
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| 265 | break; |
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| 266 | |
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| 267 | #ifdef DEBUG_NE2000 |
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| 268 | printk ("NE2000 status 0x%x (8259 enabled: %s; mask: %x)\n", status, |
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| 269 | i8259s_cache & (1 << sc->irno) ? "no" : "yes", |
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| 270 | i8259s_cache); |
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| 271 | #endif |
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| 272 | |
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| 273 | /* Check for incoming packet overwrite. */ |
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| 274 | if (status & MSK_OVW) { |
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| 275 | unsigned char status2; |
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| 276 | |
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| 277 | ++sc->stats.overruns; |
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| 278 | outport_byte (port + CMDR, MSK_PG0 | MSK_STP | MSK_RD2); |
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| 279 | Wait_X_ms (2); |
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| 280 | outport_byte (port + RBCR0, 0); |
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| 281 | outport_byte (port + RBCR1, 0); |
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| 282 | inport_byte (port + ISR, status2); |
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| 283 | status |= status2 & (MSK_PTX | MSK_TXE); |
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| 284 | outport_byte (port + TCR, MSK_LOOP); |
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| 285 | outport_byte (port + CMDR, MSK_PG0 | MSK_STA | MSK_RD2); |
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| 286 | sc->overrun = 1; |
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| 287 | if ((status & (MSK_PTX | MSK_TXE)) == 0) |
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| 288 | sc->resend = 1; |
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| 289 | rtems_event_send (sc->rx_daemon_tid, INTERRUPT_EVENT); |
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| 290 | } |
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| 291 | |
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| 292 | /* Check for transmitted packet. The transmit daemon may now be |
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| 293 | able to send another packet to the device. */ |
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| 294 | if ((status & (MSK_PTX | MSK_TXE)) != 0) { |
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| 295 | ++sc->stats.tx_acks; |
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| 296 | outport_byte (port + ISR, status & (MSK_PTX | MSK_TXE)); |
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| 297 | --sc->inuse; |
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| 298 | sc->transmitting = 0; |
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| 299 | if (sc->inuse > 0 || (sc->arpcom.ac_if.if_flags & IFF_OACTIVE) != 0) |
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| 300 | rtems_event_send (sc->tx_daemon_tid, START_TRANSMIT_EVENT); |
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| 301 | } |
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| 302 | |
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| 303 | /* Check for received packet. */ |
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| 304 | if ((status & (MSK_PRX | MSK_RXE)) != 0) { |
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| 305 | ++sc->stats.rx_acks; |
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| 306 | outport_byte (port + ISR, status & (MSK_PRX | MSK_RXE)); |
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| 307 | rtems_event_send (sc->rx_daemon_tid, INTERRUPT_EVENT); |
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| 308 | } |
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| 309 | |
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| 310 | /* Check for counter change. */ |
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| 311 | if ((status & MSK_CNT) != 0) { |
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| 312 | unsigned char add; |
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| 313 | |
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| 314 | inport_byte (port + CNTR0, add); |
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| 315 | sc->stats.rx_frame_errors += add; |
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| 316 | inport_byte (port + CNTR1, add); |
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| 317 | sc->stats.rx_crc_errors += add; |
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| 318 | inport_byte (port + CNTR2, add); |
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| 319 | sc->stats.rx_missed_errors += add; |
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| 320 | outport_byte (port + ISR, MSK_CNT); |
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| 321 | } |
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| 322 | } |
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| 323 | |
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| 324 | outport_byte (port + CMDR, MSK_PG0 | MSK_STA | MSK_RD2); |
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| 325 | } |
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| 326 | |
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| 327 | /* Handle an NE2000 interrupt. */ |
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| 328 | |
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| 329 | static rtems_isr |
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| 330 | ne_interrupt_handler (rtems_vector_number v) |
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| 331 | { |
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| 332 | struct ne_softc *sc; |
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| 333 | |
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| 334 | sc = ne_device_for_irno (v); |
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| 335 | if (sc == NULL) |
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| 336 | return; |
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| 337 | |
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| 338 | ++sc->stats.interrupts; |
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| 339 | |
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| 340 | ne_check_status (sc); |
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| 341 | } |
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| 342 | |
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| 343 | /* Turn NE2000 interrupts on. */ |
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| 344 | |
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| 345 | static void |
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| 346 | ne_interrupt_on (const rtems_irq_connect_data *irq) |
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| 347 | { |
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| 348 | struct ne_softc *sc; |
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| 349 | |
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| 350 | #ifdef DEBUG_NE2000 |
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| 351 | printk ("ne_interrupt_on\n"); |
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| 352 | #endif |
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| 353 | sc = ne_device_for_irno (irq->name); |
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| 354 | if (sc != NULL) |
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| 355 | outport_byte (sc->port + IMR, NE_INTERRUPTS); |
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| 356 | } |
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| 357 | |
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| 358 | /* Turn NE2000 interrupts off. See ne_interrupt_on. */ |
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| 359 | |
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| 360 | static void |
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| 361 | ne_interrupt_off (const rtems_irq_connect_data *irq) |
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| 362 | { |
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| 363 | struct ne_softc *sc; |
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| 364 | |
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| 365 | #ifdef DEBUG_NE2000 |
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| 366 | printk ("ne_interrupt_off\n"); |
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| 367 | #endif |
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| 368 | sc = ne_device_for_irno (irq->name); |
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| 369 | if (sc != NULL) |
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| 370 | outport_byte (sc->port + IMR, 0); |
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| 371 | } |
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| 372 | |
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| 373 | /* Return whether NE2000 interrupts are on. */ |
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| 374 | |
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| 375 | static int |
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| 376 | ne_interrupt_is_on (const rtems_irq_connect_data *irq) |
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| 377 | { |
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| 378 | return BSP_irq_enabled_at_i8259s (irq->name); |
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| 379 | } |
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| 380 | |
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| 381 | /* Initialize the NE2000 hardware. */ |
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| 382 | |
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| 383 | static void |
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| 384 | ne_init_hardware (struct ne_softc *sc) |
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| 385 | { |
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| 386 | unsigned int port = sc->port; |
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| 387 | int i; |
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| 388 | rtems_irq_connect_data irq; |
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| 389 | |
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| 390 | #ifdef DEBUG_NE2000 |
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| 391 | printk ("ne_init_hardware\n"); |
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| 392 | #endif |
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| 393 | |
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| 394 | /* Initialize registers. */ |
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| 395 | |
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| 396 | outport_byte (port + CMDR, MSK_PG0 | MSK_RD2 | MSK_STP); |
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| 397 | |
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| 398 | if (sc->byte_transfers) { |
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| 399 | outport_byte (port + DCR, MSK_FT10 | MSK_BMS); |
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| 400 | } |
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| 401 | else { |
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| 402 | outport_byte (port + DCR, MSK_FT10 | MSK_BMS | MSK_WTS); |
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| 403 | } |
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| 404 | |
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| 405 | outport_byte (port + RBCR0, 0); |
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| 406 | outport_byte (port + RBCR1, 0); |
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| 407 | outport_byte (port + RCR, MSK_MON); |
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| 408 | outport_byte (port + TCR, MSK_LOOP); |
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| 409 | outport_byte (port + IMR, 0); |
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| 410 | outport_byte (port + ISR, 0xff); |
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| 411 | outport_byte (port + PSTOP, NE_STOP_PAGE); |
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| 412 | outport_byte (port + PSTART, NE_FIRST_RX_PAGE); |
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| 413 | outport_byte (port + BNRY, NE_STOP_PAGE - 1); |
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| 414 | |
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| 415 | /* Set the Ethernet hardware address. */ |
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| 416 | |
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| 417 | outport_byte (port + CMDR, MSK_PG1 | MSK_RD2); |
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| 418 | for (i = 0; i < ETHER_ADDR_LEN; ++i) |
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| 419 | outport_byte (port + PAR + i, sc->arpcom.ac_enaddr[i]); |
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| 420 | |
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| 421 | #ifdef DEBUG_NE2000 |
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| 422 | printk ("Using ethernet address: "); |
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| 423 | for (i = 0; i < ETHER_ADDR_LEN; ++i) |
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| 424 | printk("%x ",sc->arpcom.ac_enaddr[i]); |
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| 425 | printk ("\n"); |
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| 426 | #endif |
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| 427 | |
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| 428 | /* Clear the multicast address. */ |
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| 429 | for (i = 0; i < MARsize; ++i) |
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| 430 | outport_byte (port + MAR + i, 0); |
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| 431 | |
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| 432 | outport_byte (port + CURR, NE_FIRST_RX_PAGE); |
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| 433 | |
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| 434 | outport_byte (port + CMDR, MSK_PG0 | MSK_RD2); |
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| 435 | |
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| 436 | /* Put the device on line. */ |
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| 437 | outport_byte (port + CMDR, MSK_PG0 | MSK_STA | MSK_RD2); |
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| 438 | |
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| 439 | /* Set up interrupts. */ |
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| 440 | |
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| 441 | irq.name = sc->irno; |
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[202ed85] | 442 | irq.hdl = (rtems_irq_hdl)ne_interrupt_handler; |
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[16a384cf] | 443 | irq.on = ne_interrupt_on; |
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| 444 | irq.off = ne_interrupt_off; |
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| 445 | irq.isOn = ne_interrupt_is_on; |
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| 446 | |
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| 447 | if (! BSP_install_rtems_irq_handler (&irq)) |
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| 448 | rtems_panic ("Can't attach NE interrupt handler for irq %d.\n", |
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| 449 | sc->irno); |
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| 450 | |
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| 451 | /* Prepare to receive packets. */ |
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| 452 | |
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| 453 | outport_byte (port + TCR, 0); |
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| 454 | outport_byte (port + RCR, (sc->accept_broadcasts ? MSK_AB : 0)); |
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| 455 | } |
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| 456 | |
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| 457 | /* The NE2000 packet receive daemon. This task is started when the |
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| 458 | NE2000 driver is initialized. */ |
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| 459 | |
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| 460 | static void |
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| 461 | ne_rx_daemon (void *arg) |
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| 462 | { |
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| 463 | struct ne_softc *sc = (struct ne_softc *) arg; |
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| 464 | struct ifnet *ifp = &sc->arpcom.ac_if; |
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| 465 | unsigned int port = sc->port; |
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| 466 | unsigned int dport = port + DATAPORT; |
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| 467 | |
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| 468 | while (1) { |
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| 469 | rtems_event_set events; |
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| 470 | |
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| 471 | /* Wait for the interrupt handler to tell us that there is a |
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| 472 | packet ready to receive. */ |
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| 473 | rtems_bsdnet_event_receive (INTERRUPT_EVENT, |
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| 474 | RTEMS_WAIT | RTEMS_EVENT_ANY, |
---|
| 475 | RTEMS_NO_TIMEOUT, |
---|
| 476 | &events); |
---|
| 477 | |
---|
| 478 | /* Don't let the device interrupt us now. */ |
---|
| 479 | outport_byte (port + IMR, 0); |
---|
| 480 | |
---|
| 481 | while (1) { |
---|
| 482 | unsigned char startpage, currpage; |
---|
| 483 | unsigned short statnext, len; |
---|
| 484 | int next; |
---|
| 485 | struct mbuf *m; |
---|
| 486 | unsigned char *p; |
---|
| 487 | int startaddr; |
---|
| 488 | int toend; |
---|
| 489 | struct ether_header *eh; |
---|
| 490 | |
---|
| 491 | inport_byte (port + BNRY, startpage); |
---|
| 492 | |
---|
| 493 | outport_byte (port + CMDR, MSK_PG1 | MSK_RD2); |
---|
| 494 | inport_byte (port + CURR, currpage); |
---|
| 495 | outport_byte (port + CMDR, MSK_PG0 | MSK_RD2); |
---|
| 496 | |
---|
| 497 | ++startpage; |
---|
| 498 | if (startpage >= NE_STOP_PAGE) |
---|
| 499 | startpage = NE_FIRST_RX_PAGE; |
---|
| 500 | |
---|
| 501 | if (startpage == currpage) |
---|
| 502 | break; |
---|
| 503 | |
---|
| 504 | #ifdef DEBUG_NE2000 |
---|
| 505 | printk ("ne_rx_daemon: start page %x; current page %x\n", |
---|
| 506 | startpage, currpage); |
---|
| 507 | #endif |
---|
| 508 | |
---|
| 509 | /* Read the buffer header. This is 1 byte receive status, 1 |
---|
| 510 | byte page of next buffer, 2 bytes length. */ |
---|
| 511 | outport_byte (port + CMDR, MSK_PG0 | MSK_RD2 | MSK_STA); |
---|
| 512 | outport_byte (port + RBCR0, 4); |
---|
| 513 | outport_byte (port + RBCR1, 0); |
---|
| 514 | outport_byte (port + RSAR0, 0); |
---|
| 515 | outport_byte (port + RSAR1, startpage); |
---|
| 516 | outport_byte (port + CMDR, MSK_PG0 | MSK_RRE | MSK_STA); |
---|
| 517 | |
---|
| 518 | if (sc->byte_transfers) { |
---|
| 519 | unsigned char data; |
---|
| 520 | |
---|
| 521 | inport_byte (dport, data); /* Throw away status */ |
---|
| 522 | inport_byte (dport, data); |
---|
| 523 | next = data; |
---|
| 524 | |
---|
| 525 | inport_byte (dport, data); |
---|
| 526 | len = data; |
---|
| 527 | inport_byte (dport, data); |
---|
| 528 | len |= data << 8; |
---|
| 529 | } |
---|
| 530 | else { /* Word transfers */ |
---|
| 531 | inport_word (dport, statnext); |
---|
| 532 | inport_word (dport, len); |
---|
| 533 | |
---|
| 534 | next = statnext >> 8; |
---|
| 535 | } |
---|
| 536 | |
---|
| 537 | outport_byte (port + ISR, MSK_RDC); |
---|
| 538 | |
---|
| 539 | if (next >= NE_STOP_PAGE) |
---|
| 540 | next = NE_FIRST_RX_PAGE; |
---|
| 541 | |
---|
| 542 | /* The first four bytes of the length are the buffer header. */ |
---|
| 543 | len -= 4; |
---|
| 544 | startaddr = startpage * NE_PAGE_SIZE + 4; |
---|
| 545 | |
---|
| 546 | MGETHDR (m, M_WAIT, MT_DATA); |
---|
| 547 | MCLGET (m, M_WAIT); |
---|
| 548 | m->m_pkthdr.rcvif = ifp; |
---|
| 549 | |
---|
| 550 | p = mtod (m, unsigned char *); |
---|
| 551 | m->m_len = m->m_pkthdr.len = len - sizeof (struct ether_header); |
---|
| 552 | |
---|
| 553 | toend = NE_STOP_PAGE * NE_PAGE_SIZE - startaddr; |
---|
| 554 | if (toend < len) { |
---|
| 555 | ne_read_data (sc, startaddr, toend, p); |
---|
| 556 | p += toend; |
---|
| 557 | len -= toend; |
---|
| 558 | startaddr = NE_FIRST_RX_PAGE * NE_PAGE_SIZE; |
---|
| 559 | } |
---|
| 560 | |
---|
| 561 | if (len > 0) |
---|
| 562 | ne_read_data (sc, startaddr, len, p); |
---|
| 563 | |
---|
| 564 | eh = mtod (m, struct ether_header *); |
---|
| 565 | m->m_data += sizeof (struct ether_header); |
---|
| 566 | ether_input (ifp, eh, m); |
---|
| 567 | |
---|
| 568 | ++sc->stats.rx_packets; |
---|
| 569 | |
---|
| 570 | outport_byte (port + BNRY, next - 1); |
---|
| 571 | } |
---|
| 572 | |
---|
| 573 | if (sc->overrun) { |
---|
| 574 | outport_byte (port + ISR, MSK_OVW); |
---|
| 575 | outport_byte (port + TCR, 0); |
---|
| 576 | if (sc->resend) |
---|
| 577 | outport_byte (port + CMDR, MSK_PG0 | MSK_TXP | MSK_RD2 | MSK_STA); |
---|
| 578 | sc->resend = 0; |
---|
| 579 | sc->overrun = 0; |
---|
| 580 | } |
---|
| 581 | |
---|
| 582 | /* Reenable device interrupts. */ |
---|
| 583 | outport_byte (port + IMR, NE_INTERRUPTS); |
---|
| 584 | } |
---|
| 585 | } |
---|
| 586 | |
---|
| 587 | /* Load an NE2000 packet onto the device. */ |
---|
| 588 | |
---|
| 589 | static void |
---|
| 590 | ne_loadpacket (struct ne_softc *sc, struct mbuf *m) |
---|
| 591 | { |
---|
| 592 | unsigned int port = sc->port; |
---|
| 593 | unsigned int dport = port + DATAPORT; |
---|
| 594 | struct mbuf *mhold = m; |
---|
| 595 | int leftover; |
---|
| 596 | unsigned char leftover_data; |
---|
| 597 | int timeout; |
---|
| 598 | |
---|
| 599 | #ifdef DEBUG_NE2000 |
---|
| 600 | printk ("Uploading NE2000 packet\n"); |
---|
| 601 | #endif |
---|
| 602 | |
---|
| 603 | /* Reset remote DMA complete flag. */ |
---|
| 604 | outport_byte (port + ISR, MSK_RDC); |
---|
| 605 | |
---|
| 606 | /* Write out the count. */ |
---|
| 607 | outport_byte (port + RBCR0, m->m_pkthdr.len); |
---|
| 608 | outport_byte (port + RBCR1, m->m_pkthdr.len >> 8); |
---|
| 609 | |
---|
| 610 | sc->sendlen[sc->nextavail] = m->m_pkthdr.len; |
---|
| 611 | |
---|
| 612 | /* Tell the device which address we want to write to. */ |
---|
| 613 | outport_byte (port + RSAR0, 0); |
---|
| 614 | outport_byte (port + RSAR1, |
---|
| 615 | NE_FIRST_TX_PAGE + (sc->nextavail * NE_TX_PAGES)); |
---|
| 616 | |
---|
| 617 | /* Set up the write. */ |
---|
| 618 | outport_byte (port + CMDR, MSK_PG0 | MSK_RWR | MSK_STA); |
---|
| 619 | |
---|
| 620 | /* Transfer the mbuf chain to device memory. NE2000 devices require |
---|
| 621 | that the data be transferred as words, so we need to handle odd |
---|
| 622 | length mbufs. Never occurs if we force byte transfers. */ |
---|
| 623 | |
---|
| 624 | leftover = 0; |
---|
| 625 | leftover_data = '\0'; |
---|
| 626 | |
---|
| 627 | for (; m != NULL; m = m->m_next) { |
---|
| 628 | int len; |
---|
| 629 | unsigned char *data; |
---|
| 630 | |
---|
| 631 | len = m->m_len; |
---|
| 632 | if (len == 0) |
---|
| 633 | continue; |
---|
| 634 | |
---|
| 635 | data = mtod (m, unsigned char *); |
---|
| 636 | |
---|
| 637 | if (leftover) { |
---|
| 638 | unsigned char next; |
---|
| 639 | |
---|
| 640 | /* Data left over from previous mbuf in chain. */ |
---|
| 641 | next = *data++; |
---|
| 642 | --len; |
---|
| 643 | outport_word (dport, leftover_data | (next << 8)); |
---|
| 644 | leftover = 0; |
---|
| 645 | } |
---|
| 646 | |
---|
[6128a4a] | 647 | /* If using byte transfers, len always ends up as zero so |
---|
[16a384cf] | 648 | there are no leftovers. */ |
---|
| 649 | |
---|
| 650 | if (sc->byte_transfers) |
---|
| 651 | while (len > 0) { |
---|
| 652 | outport_byte (dport, *data++); |
---|
| 653 | len--; |
---|
| 654 | } |
---|
| 655 | else |
---|
| 656 | while (len > 1) { |
---|
| 657 | outport_word (dport, data[0] | (data[1] << 8)); |
---|
| 658 | data += 2; |
---|
| 659 | len -= 2; |
---|
| 660 | } |
---|
| 661 | |
---|
| 662 | if (len > 0) |
---|
| 663 | { |
---|
| 664 | leftover = 1; |
---|
| 665 | leftover_data = *data++; |
---|
| 666 | } |
---|
| 667 | } |
---|
| 668 | |
---|
| 669 | if (leftover) |
---|
| 670 | outport_word (dport, leftover_data); |
---|
| 671 | |
---|
| 672 | m_freem (mhold); |
---|
| 673 | |
---|
| 674 | /* Wait for the device to complete accepting the data, with a |
---|
| 675 | limiting counter so that we don't wait too long. */ |
---|
| 676 | for (timeout = 0; timeout < 100; ++timeout) |
---|
| 677 | { |
---|
| 678 | unsigned char status; |
---|
| 679 | |
---|
| 680 | inport_byte (port + ISR, status); |
---|
| 681 | |
---|
| 682 | #ifdef DEBUG_NE2000 |
---|
| 683 | if ((status &~ MSK_RDC) != 0) |
---|
| 684 | printk ("Status 0x%x while waiting for acknowledgement of uploaded packet\n", |
---|
| 685 | status); |
---|
| 686 | #endif |
---|
| 687 | |
---|
| 688 | if ((status & MSK_RDC) != 0) { |
---|
| 689 | outport_byte (port + ISR, MSK_RDC); |
---|
| 690 | break; |
---|
| 691 | } |
---|
| 692 | } |
---|
| 693 | |
---|
| 694 | if (timeout >= 100) |
---|
| 695 | printk ("Timed out waiting for acknowledgement of uploaded NE2000 packet\n"); |
---|
| 696 | |
---|
| 697 | ++sc->nextavail; |
---|
| 698 | if (sc->nextavail == NE_TX_BUFS) |
---|
| 699 | sc->nextavail = 0; |
---|
| 700 | } |
---|
| 701 | |
---|
| 702 | /* Tell the NE2000 to transmit a buffer whose contents we have already |
---|
| 703 | loaded onto the device. */ |
---|
| 704 | |
---|
| 705 | static void |
---|
| 706 | ne_transmit (struct ne_softc *sc) |
---|
| 707 | { |
---|
| 708 | unsigned int port = sc->port; |
---|
| 709 | int len; |
---|
| 710 | |
---|
| 711 | #ifdef DEBUG_NE2000 |
---|
| 712 | printk ("Transmitting NE2000 packet\n"); |
---|
| 713 | #endif |
---|
| 714 | |
---|
| 715 | len = sc->sendlen[sc->nextsend]; |
---|
| 716 | if (len < ET_MINLEN) |
---|
| 717 | len = ET_MINLEN; |
---|
| 718 | outport_byte (port + TBCR0, len); |
---|
| 719 | outport_byte (port + TBCR1, len >> 8); |
---|
| 720 | |
---|
| 721 | outport_byte (port + TPSR, NE_FIRST_TX_PAGE + (sc->nextsend * NE_TX_PAGES)); |
---|
| 722 | |
---|
| 723 | outport_byte (port + CMDR, MSK_PG0 | MSK_TXP | MSK_RD2 | MSK_STA); |
---|
| 724 | |
---|
| 725 | ++sc->nextsend; |
---|
| 726 | if (sc->nextsend == NE_TX_BUFS) |
---|
| 727 | sc->nextsend = 0; |
---|
| 728 | |
---|
| 729 | ++sc->stats.tx_packets; |
---|
| 730 | } |
---|
| 731 | |
---|
| 732 | /* The NE2000 packet transmit daemon. This task is started when the |
---|
| 733 | NE2000 driver is initialized. */ |
---|
| 734 | |
---|
| 735 | static void |
---|
| 736 | ne_tx_daemon (void *arg) |
---|
| 737 | { |
---|
| 738 | struct ne_softc *sc = (struct ne_softc *) arg; |
---|
| 739 | unsigned int port = sc->port; |
---|
| 740 | struct ifnet *ifp = &sc->arpcom.ac_if; |
---|
| 741 | |
---|
| 742 | while (1) { |
---|
| 743 | rtems_event_set events; |
---|
| 744 | |
---|
| 745 | /* Wait for a packet to be ready for sending, or for there to be |
---|
| 746 | room for another packet in the device memory. */ |
---|
| 747 | rtems_bsdnet_event_receive (START_TRANSMIT_EVENT, |
---|
| 748 | RTEMS_EVENT_ANY | RTEMS_WAIT, |
---|
| 749 | RTEMS_NO_TIMEOUT, |
---|
| 750 | &events); |
---|
| 751 | |
---|
| 752 | #ifdef DEBUG_NE2000 |
---|
| 753 | printk ("ne_tx_daemon\n"); |
---|
| 754 | #endif |
---|
| 755 | |
---|
| 756 | /* This daemon handles both uploading data onto the device and |
---|
| 757 | telling the device to transmit data which has been uploaded. |
---|
| 758 | These are separate tasks, because while the device is |
---|
| 759 | transmitting one buffer we will upload another. */ |
---|
| 760 | |
---|
| 761 | /* Don't let the device interrupt us now. */ |
---|
| 762 | outport_byte (port + IMR, 0); |
---|
| 763 | |
---|
| 764 | while (1) { |
---|
| 765 | struct mbuf *m; |
---|
| 766 | |
---|
| 767 | /* If the device is not transmitting a packet, and we have |
---|
| 768 | uploaded a packet, tell the device to transmit it. */ |
---|
| 769 | if (! sc->transmitting && sc->inuse > 0) { |
---|
| 770 | sc->transmitting = 1; |
---|
| 771 | ne_transmit (sc); |
---|
| 772 | } |
---|
| 773 | |
---|
| 774 | /* If we don't have any more buffers to send, quit now. */ |
---|
| 775 | if (ifp->if_snd.ifq_head == NULL) { |
---|
| 776 | ifp->if_flags &= ~IFF_OACTIVE; |
---|
| 777 | break; |
---|
| 778 | } |
---|
| 779 | |
---|
| 780 | /* Allocate a buffer to load data into. If there are none |
---|
| 781 | available, quit until a buffer has been transmitted. */ |
---|
| 782 | if (sc->inuse >= NE_TX_BUFS) |
---|
| 783 | break; |
---|
| 784 | |
---|
| 785 | ++sc->inuse; |
---|
| 786 | |
---|
| 787 | IF_DEQUEUE (&ifp->if_snd, m); |
---|
| 788 | if (m == NULL) |
---|
| 789 | panic ("ne_tx_daemon"); |
---|
| 790 | |
---|
| 791 | ne_loadpacket (sc, m); |
---|
| 792 | |
---|
| 793 | /* Check the device status. It may have finished transmitting |
---|
| 794 | the last packet. */ |
---|
| 795 | ne_check_status (sc); |
---|
| 796 | } |
---|
| 797 | |
---|
| 798 | /* Reenable device interrupts. */ |
---|
| 799 | outport_byte (port + IMR, NE_INTERRUPTS); |
---|
| 800 | } |
---|
| 801 | } |
---|
| 802 | |
---|
| 803 | /* Start sending an NE2000 packet. */ |
---|
| 804 | |
---|
| 805 | static void |
---|
| 806 | ne_start (struct ifnet *ifp) |
---|
| 807 | { |
---|
| 808 | struct ne_softc *sc = ifp->if_softc; |
---|
| 809 | |
---|
| 810 | /* Tell the transmit daemon to wake up and send a packet. */ |
---|
| 811 | rtems_event_send (sc->tx_daemon_tid, START_TRANSMIT_EVENT); |
---|
| 812 | ifp->if_flags |= IFF_OACTIVE; |
---|
| 813 | } |
---|
| 814 | |
---|
| 815 | /* Initialize and start and NE2000. */ |
---|
| 816 | |
---|
| 817 | static void |
---|
| 818 | ne_init (void *arg) |
---|
| 819 | { |
---|
| 820 | struct ne_softc *sc = (struct ne_softc *) arg; |
---|
| 821 | struct ifnet *ifp = &sc->arpcom.ac_if; |
---|
| 822 | |
---|
| 823 | if (sc->tx_daemon_tid == 0) { |
---|
| 824 | sc->inuse = 0; |
---|
| 825 | sc->nextavail = 0; |
---|
| 826 | sc->nextsend = 0; |
---|
| 827 | sc->transmitting = 0; |
---|
| 828 | |
---|
| 829 | ne_init_hardware (sc); |
---|
| 830 | |
---|
| 831 | sc->tx_daemon_tid = rtems_bsdnet_newproc ("SCtx", 4096, ne_tx_daemon, sc); |
---|
| 832 | sc->rx_daemon_tid = rtems_bsdnet_newproc ("SCrx", 4096, ne_rx_daemon, sc); |
---|
| 833 | } |
---|
| 834 | |
---|
| 835 | ifp->if_flags |= IFF_RUNNING; |
---|
| 836 | } |
---|
| 837 | |
---|
| 838 | /* Stop an NE2000. */ |
---|
| 839 | |
---|
| 840 | static void |
---|
| 841 | ne_stop (struct ne_softc *sc) |
---|
| 842 | { |
---|
| 843 | unsigned int port = sc->port; |
---|
| 844 | int i; |
---|
| 845 | |
---|
| 846 | sc->arpcom.ac_if.if_flags &= ~IFF_RUNNING; |
---|
| 847 | |
---|
| 848 | /* Stop everything. */ |
---|
| 849 | outport_byte (port + CMDR, MSK_STP | MSK_RD2); |
---|
| 850 | |
---|
| 851 | /* Wait for the interface to stop, using I as a time limit. */ |
---|
| 852 | for (i = 0; i < 5000; ++i) |
---|
| 853 | { |
---|
| 854 | unsigned char status; |
---|
| 855 | |
---|
| 856 | inport_byte (port + ISR, status); |
---|
| 857 | if ((status & MSK_RST) != 0) |
---|
| 858 | break; |
---|
| 859 | } |
---|
| 860 | |
---|
| 861 | sc->inuse = 0; |
---|
| 862 | sc->nextavail = 0; |
---|
| 863 | sc->nextsend = 0; |
---|
| 864 | sc->transmitting = 0; |
---|
| 865 | } |
---|
| 866 | |
---|
| 867 | /* Show NE2000 interface statistics. */ |
---|
| 868 | |
---|
| 869 | static void |
---|
| 870 | ne_stats (struct ne_softc *sc) |
---|
| 871 | { |
---|
| 872 | printf (" Received packets: %-8lu", sc->stats.rx_packets); |
---|
| 873 | printf (" Transmitted packets: %-8lu\n", sc->stats.tx_packets); |
---|
| 874 | printf (" Receive acks: %-8lu", sc->stats.rx_acks); |
---|
| 875 | printf (" Transmit acks: %-8lu\n", sc->stats.tx_acks); |
---|
| 876 | printf (" Packet overruns: %-8lu", sc->stats.overruns); |
---|
| 877 | printf (" Frame errors: %-8lu\n", sc->stats.rx_frame_errors); |
---|
| 878 | printf (" CRC errors: %-8lu", sc->stats.rx_crc_errors); |
---|
| 879 | printf (" Missed packets: %-8lu\n", sc->stats.rx_missed_errors); |
---|
| 880 | printf (" Interrupts: %-8lu\n", sc->stats.interrupts); |
---|
| 881 | } |
---|
| 882 | |
---|
| 883 | /* NE2000 driver ioctl handler. */ |
---|
| 884 | |
---|
| 885 | static int |
---|
[ff73cf6] | 886 | ne_ioctl (struct ifnet *ifp, ioctl_command_t command, caddr_t data) |
---|
[16a384cf] | 887 | { |
---|
| 888 | struct ne_softc *sc = ifp->if_softc; |
---|
| 889 | int error = 0; |
---|
| 890 | |
---|
| 891 | switch (command) { |
---|
| 892 | case SIOCGIFADDR: |
---|
| 893 | case SIOCSIFADDR: |
---|
| 894 | error = ether_ioctl (ifp, command, data); |
---|
| 895 | break; |
---|
| 896 | |
---|
| 897 | case SIOCSIFFLAGS: |
---|
| 898 | switch (ifp->if_flags & (IFF_UP | IFF_RUNNING)) { |
---|
| 899 | case IFF_RUNNING: |
---|
| 900 | ne_stop (sc); |
---|
| 901 | break; |
---|
| 902 | |
---|
| 903 | case IFF_UP: |
---|
| 904 | ne_init (sc); |
---|
| 905 | break; |
---|
| 906 | |
---|
| 907 | case IFF_UP | IFF_RUNNING: |
---|
| 908 | ne_stop (sc); |
---|
| 909 | ne_init (sc); |
---|
| 910 | break; |
---|
| 911 | |
---|
| 912 | default: |
---|
| 913 | break; |
---|
| 914 | } |
---|
| 915 | break; |
---|
| 916 | |
---|
| 917 | case SIO_RTEMS_SHOW_STATS: |
---|
| 918 | ne_stats (sc); |
---|
| 919 | break; |
---|
| 920 | |
---|
| 921 | /* FIXME: Multicast commands must be added here. */ |
---|
| 922 | |
---|
| 923 | default: |
---|
| 924 | error = EINVAL; |
---|
| 925 | break; |
---|
| 926 | } |
---|
| 927 | |
---|
| 928 | return error; |
---|
| 929 | } |
---|
| 930 | |
---|
| 931 | /* Attach an NE2000 driver to the system. */ |
---|
| 932 | |
---|
| 933 | int |
---|
| 934 | rtems_ne_driver_attach (struct rtems_bsdnet_ifconfig *config) |
---|
| 935 | { |
---|
| 936 | int i; |
---|
| 937 | struct ne_softc *sc; |
---|
| 938 | struct ifnet *ifp; |
---|
| 939 | int mtu; |
---|
| 940 | |
---|
| 941 | /* Find a free driver. */ |
---|
| 942 | sc = NULL; |
---|
| 943 | for (i = 0; i < NNEDRIVER; ++i) { |
---|
| 944 | sc = &ne_softc[i]; |
---|
| 945 | ifp = &sc->arpcom.ac_if; |
---|
| 946 | if (ifp->if_softc == NULL) |
---|
| 947 | break; |
---|
| 948 | } |
---|
| 949 | |
---|
| 950 | if (sc == NULL) { |
---|
| 951 | printf ("Too many NE2000 drivers.\n"); |
---|
| 952 | return 0; |
---|
| 953 | } |
---|
| 954 | |
---|
| 955 | memset (sc, 0, sizeof *sc); |
---|
| 956 | |
---|
| 957 | /* Check whether we do byte-wide or word-wide transfers. */ |
---|
[6128a4a] | 958 | |
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[16a384cf] | 959 | #ifdef NE2000_BYTE_TRANSFERS |
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[57bc54dc] | 960 | sc->byte_transfers = true; |
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[16a384cf] | 961 | #else |
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[57bc54dc] | 962 | sc->byte_transfers = false; |
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[16a384cf] | 963 | #endif |
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| 964 | |
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| 965 | /* Handle the options passed in by the caller. */ |
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| 966 | |
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| 967 | if (config->mtu != 0) |
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| 968 | mtu = config->mtu; |
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| 969 | else |
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| 970 | mtu = ETHERMTU; |
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| 971 | |
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| 972 | if (config->irno != 0) |
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| 973 | sc->irno = config->irno; |
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| 974 | else { |
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| 975 | /* We use 5 as the default IRQ. */ |
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| 976 | sc->irno = 5; |
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| 977 | } |
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| 978 | |
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| 979 | if (config->port != 0) |
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| 980 | sc->port = config->port; |
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| 981 | else { |
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| 982 | /* We use 0x300 as the default IO port number. */ |
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| 983 | sc->port = 0x300; |
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| 984 | } |
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| 985 | |
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| 986 | sc->accept_broadcasts = ! config->ignore_broadcast; |
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| 987 | |
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| 988 | if (config->hardware_address != NULL) |
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| 989 | memcpy (sc->arpcom.ac_enaddr, config->hardware_address, |
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| 990 | ETHER_ADDR_LEN); |
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| 991 | else |
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| 992 | { |
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| 993 | unsigned char prom[16]; |
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| 994 | int ia; |
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| 995 | |
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| 996 | /* Read the PROM to get the Ethernet hardware address. */ |
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| 997 | |
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| 998 | outport_byte (sc->port + CMDR, MSK_PG0 | MSK_RD2 | MSK_STP); |
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| 999 | |
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| 1000 | if (sc->byte_transfers) { |
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| 1001 | outport_byte (sc->port + DCR, MSK_FT10 | MSK_BMS); |
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| 1002 | } |
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| 1003 | else { |
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| 1004 | outport_byte (sc->port + DCR, MSK_FT10 | MSK_BMS | MSK_WTS); |
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| 1005 | } |
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| 1006 | |
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| 1007 | outport_byte (sc->port + RBCR0, 0); |
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| 1008 | outport_byte (sc->port + RBCR1, 0); |
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| 1009 | outport_byte (sc->port + RCR, MSK_MON); |
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| 1010 | outport_byte (sc->port + TCR, MSK_LOOP); |
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| 1011 | outport_byte (sc->port + IMR, 0); |
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| 1012 | outport_byte (sc->port + ISR, 0xff); |
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| 1013 | |
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| 1014 | ne_read_data (sc, 0, sizeof prom, prom); |
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| 1015 | |
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| 1016 | outport_byte (sc->port + CMDR, MSK_PG0 | MSK_RD2 | MSK_STP); |
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| 1017 | |
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| 1018 | for (ia = 0; ia < ETHER_ADDR_LEN; ++ia) |
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| 1019 | sc->arpcom.ac_enaddr[ia] = prom[ia * 2]; |
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| 1020 | } |
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| 1021 | |
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| 1022 | /* Set up the network interface. */ |
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| 1023 | |
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| 1024 | ifp->if_softc = sc; |
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| 1025 | ifp->if_unit = i + 1; |
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| 1026 | ifp->if_name = "ne"; |
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| 1027 | ifp->if_mtu = mtu; |
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| 1028 | ifp->if_init = ne_init; |
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| 1029 | ifp->if_ioctl = ne_ioctl; |
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| 1030 | ifp->if_start = ne_start; |
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| 1031 | ifp->if_output = ether_output; |
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| 1032 | ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX; |
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| 1033 | if (ifp->if_snd.ifq_maxlen == 0) |
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| 1034 | ifp->if_snd.ifq_maxlen = ifqmaxlen; |
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| 1035 | |
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| 1036 | /* Attach the interface. */ |
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| 1037 | |
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| 1038 | if_attach (ifp); |
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| 1039 | ether_ifattach (ifp); |
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| 1040 | |
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| 1041 | return 1; |
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| 1042 | } |
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