Krzysztof Halasa | 921a86e | 2010-08-12 23:14:07 +0200 | [diff] [blame] | 1 | /* |
| 2 | * SBE 2T3E3 synchronous serial card driver for Linux |
| 3 | * |
| 4 | * Copyright (C) 2009-2010 Krzysztof Halasa <khc@pm.waw.pl> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify it |
| 7 | * under the terms of version 2 of the GNU General Public License |
| 8 | * as published by the Free Software Foundation. |
| 9 | * |
| 10 | * This code is based on a driver written by SBE Inc. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/interrupt.h> |
| 14 | #include <linux/netdevice.h> |
| 15 | #include "2t3e3.h" |
| 16 | |
| 17 | void t3e3_init(struct channel *sc) |
| 18 | { |
| 19 | cpld_init(sc); |
| 20 | dc_reset(sc); |
| 21 | dc_init(sc); |
| 22 | exar7250_init(sc); |
| 23 | exar7300_init(sc); |
| 24 | } |
| 25 | |
| 26 | int t3e3_if_start_xmit(struct sk_buff *skb, struct net_device *dev) |
| 27 | { |
| 28 | struct channel *sc = dev_to_priv(dev); |
| 29 | u32 current_write, last_write; |
| 30 | unsigned long flags; |
| 31 | struct sk_buff *skb2; |
| 32 | |
| 33 | if (skb == NULL) { |
| 34 | sc->s.out_errors++; |
| 35 | return 0; |
| 36 | } |
| 37 | |
| 38 | if (sc->p.transmitter_on != SBE_2T3E3_ON) { |
| 39 | sc->s.out_errors++; |
| 40 | sc->s.out_dropped++; |
| 41 | dev_kfree_skb_any(skb); |
| 42 | return 0; |
| 43 | } |
| 44 | |
| 45 | if (sc->s.OOF && sc->p.loopback == SBE_2T3E3_LOOPBACK_NONE) { |
| 46 | sc->s.out_dropped++; |
| 47 | dev_kfree_skb_any(skb); |
| 48 | return 0; |
| 49 | } |
| 50 | |
| 51 | spin_lock_irqsave(&sc->ether.tx_lock, flags); |
| 52 | |
| 53 | current_write = sc->ether.tx_ring_current_write; |
| 54 | for (skb2 = skb; skb2 != NULL; skb2 = NULL) { |
| 55 | if (skb2->len) { |
| 56 | if ((sc->ether.tx_ring[current_write].tdes1 & |
| 57 | SBE_2T3E3_TX_DESC_BUFFER_1_SIZE) > 0) |
| 58 | break; |
| 59 | current_write = (current_write + 1) % SBE_2T3E3_TX_DESC_RING_SIZE; |
| 60 | /* |
| 61 | * Leave at least 1 tx desc free so that dc_intr_tx() can |
| 62 | * identify empty list |
| 63 | */ |
| 64 | if (current_write == sc->ether.tx_ring_current_read) |
| 65 | break; |
| 66 | } |
| 67 | } |
| 68 | if (skb2 != NULL) { |
| 69 | netif_stop_queue(sc->dev); |
| 70 | sc->ether.tx_full = 1; |
| 71 | dev_dbg(&sc->pdev->dev, "SBE 2T3E3: out of descriptors\n"); |
| 72 | spin_unlock_irqrestore(&sc->ether.tx_lock, flags); |
| 73 | return NETDEV_TX_BUSY; |
| 74 | } |
| 75 | |
| 76 | current_write = last_write = sc->ether.tx_ring_current_write; |
| 77 | dev_dbg(&sc->pdev->dev, "sending mbuf (current_write = %d)\n", |
| 78 | current_write); |
| 79 | |
| 80 | for (skb2 = skb; skb2 != NULL; skb2 = NULL) { |
| 81 | if (skb2->len) { |
| 82 | dev_dbg(&sc->pdev->dev, |
| 83 | "sending mbuf (len = %d, next = %p)\n", |
| 84 | skb2->len, NULL); |
| 85 | |
| 86 | sc->ether.tx_free_cnt--; |
| 87 | sc->ether.tx_ring[current_write].tdes0 = 0; |
| 88 | sc->ether.tx_ring[current_write].tdes1 &= |
| 89 | SBE_2T3E3_TX_DESC_END_OF_RING | |
| 90 | SBE_2T3E3_TX_DESC_SECOND_ADDRESS_CHAINED; |
| 91 | /* DISABLE_PADDING sometimes gets lost somehow, hands off... */ |
| 92 | sc->ether.tx_ring[current_write].tdes1 |= |
| 93 | SBE_2T3E3_TX_DESC_DISABLE_PADDING | skb2->len; |
| 94 | |
| 95 | if (current_write == sc->ether.tx_ring_current_write) { |
| 96 | sc->ether.tx_ring[current_write].tdes1 |= |
| 97 | SBE_2T3E3_TX_DESC_FIRST_SEGMENT; |
| 98 | } else { |
| 99 | sc->ether.tx_ring[current_write].tdes0 = |
| 100 | SBE_2T3E3_TX_DESC_21143_OWN; |
| 101 | } |
| 102 | |
| 103 | sc->ether.tx_ring[current_write].tdes2 = virt_to_phys(skb2->data); |
| 104 | sc->ether.tx_data[current_write] = NULL; |
| 105 | |
| 106 | last_write = current_write; |
| 107 | current_write = (current_write + 1) % SBE_2T3E3_TX_DESC_RING_SIZE; |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | sc->ether.tx_data[last_write] = skb; |
| 112 | sc->ether.tx_ring[last_write].tdes1 |= |
| 113 | SBE_2T3E3_TX_DESC_LAST_SEGMENT | |
| 114 | SBE_2T3E3_TX_DESC_INTERRUPT_ON_COMPLETION; |
| 115 | sc->ether.tx_ring[sc->ether.tx_ring_current_write].tdes0 |= |
| 116 | SBE_2T3E3_TX_DESC_21143_OWN; |
| 117 | sc->ether.tx_ring_current_write = current_write; |
| 118 | |
| 119 | dev_dbg(&sc->pdev->dev, "txput: tdes0 = %08X tdes1 = %08X\n", |
| 120 | sc->ether.tx_ring[last_write].tdes0, |
| 121 | sc->ether.tx_ring[last_write].tdes1); |
| 122 | |
| 123 | dc_write(sc->addr, SBE_2T3E3_21143_REG_TRANSMIT_POLL_DEMAND, |
| 124 | 0xffffffff); |
| 125 | |
| 126 | spin_unlock_irqrestore(&sc->ether.tx_lock, flags); |
| 127 | return 0; |
| 128 | } |
| 129 | |
| 130 | |
| 131 | void t3e3_read_card_serial_number(struct channel *sc) |
| 132 | { |
| 133 | u32 i; |
| 134 | |
| 135 | for (i = 0; i < 3; i++) |
| 136 | sc->ether.card_serial_number[i] = t3e3_eeprom_read_word(sc, 10 + i); |
| 137 | |
YAMANE Toshiaki | 2a837cc | 2012-10-24 12:05:28 +0900 | [diff] [blame] | 138 | netdev_info(sc->dev, "SBE wanPMC-2T3E3 serial number: %04X%04X%04X\n", |
| 139 | sc->ether.card_serial_number[0], |
| 140 | sc->ether.card_serial_number[1], |
| 141 | sc->ether.card_serial_number[2]); |
Krzysztof Halasa | 921a86e | 2010-08-12 23:14:07 +0200 | [diff] [blame] | 142 | } |
| 143 | |
| 144 | /* |
| 145 | bit 0 led1 (green) |
| 146 | bit 1 led1 (yellow) |
| 147 | |
| 148 | bit 2 led2 (green) |
| 149 | bit 3 led2 (yellow) |
| 150 | |
| 151 | bit 4 led3 (green) |
| 152 | bit 5 led3 (yellow) |
| 153 | |
| 154 | bit 6 led4 (green) |
| 155 | bit 7 led4 (yellow) |
| 156 | */ |
| 157 | |
| 158 | void update_led(struct channel *sc, int blinker) |
| 159 | { |
| 160 | int leds; |
| 161 | if (sc->s.LOS) |
| 162 | leds = 0; /* led1 = off */ |
| 163 | else if (sc->s.OOF) |
| 164 | leds = 2; /* led1 = yellow */ |
| 165 | else if ((blinker & 1) && sc->rcv_count) { |
| 166 | leds = 0; /* led1 = off */ |
| 167 | sc->rcv_count = 0; |
| 168 | } else |
| 169 | leds = 1; /* led1 = green */ |
| 170 | cpld_write(sc, SBE_2T3E3_CPLD_REG_LEDR, leds); |
| 171 | sc->leds = leds; |
| 172 | } |