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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 | /* Stellaris Ethernet Controller * * Copyright (c) 2018 Zilogic Systems * * SPDX-License-Identifier: Apache-2.0 */ #define LOG_MODULE_NAME eth_stellaris #define LOG_LEVEL CONFIG_ETHERNET_LOG_LEVEL #include <logging/log.h> LOG_MODULE_REGISTER(LOG_MODULE_NAME); #include <net/ethernet.h> #include <net/net_pkt.h> #include <net/net_if.h> #include <device.h> #include <soc.h> #include <ethernet/eth_stats.h> #include "eth_stellaris_priv.h" static void eth_stellaris_assign_mac(struct device *dev) { u8_t mac_addr[6] = DT_ETH_MAC_ADDR; u32_t value = 0x0; value |= mac_addr[0]; value |= mac_addr[1] << 8; value |= mac_addr[2] << 16; value |= mac_addr[3] << 24; sys_write32(value, REG_MACIA0); value = 0x0; value |= mac_addr[4]; value |= mac_addr[5] << 8; sys_write32(value, REG_MACIA1); } static void eth_stellaris_flush(struct device *dev) { struct eth_stellaris_runtime *dev_data = DEV_DATA(dev); if (dev_data->tx_pos != 0) { sys_write32(dev_data->tx_word, REG_MACDATA); dev_data->tx_pos = 0; dev_data->tx_word = 0U; } } static void eth_stellaris_send_byte(struct device *dev, u8_t byte) { struct eth_stellaris_runtime *dev_data = DEV_DATA(dev); dev_data->tx_word |= byte << (dev_data->tx_pos * 8); dev_data->tx_pos++; if (dev_data->tx_pos == 4) { sys_write32(dev_data->tx_word, REG_MACDATA); dev_data->tx_pos = 0; dev_data->tx_word = 0U; } } static int eth_stellaris_send(struct device *dev, struct net_pkt *pkt) { struct eth_stellaris_runtime *dev_data = DEV_DATA(dev); struct net_buf *frag; u16_t i, data_len; /* Frame transmission * * First two bytes is the length of the frame, exclusive of * the header length. */ data_len = net_pkt_get_len(pkt) - sizeof(struct net_eth_hdr); eth_stellaris_send_byte(dev, data_len & 0xff); eth_stellaris_send_byte(dev, (data_len & 0xff00) >> 8); /* Send the payload */ for (frag = pkt->frags; frag; frag = frag->frags) { for (i = 0U; i < frag->len; ++i) { eth_stellaris_send_byte(dev, frag->data[i]); } } /* Will transmit the partial word. */ eth_stellaris_flush(dev); /* Enable transmit. */ sys_write32(BIT_MACTR_NEWTX, REG_MACTR); /* Wait and check if transmit successful or not. */ k_sem_take(&dev_data->tx_sem, K_FOREVER); if (dev_data->tx_err) { dev_data->tx_err = false; return -EIO; } LOG_DBG("pkt sent %p len %d", pkt, data_len); return 0; } static void eth_stellaris_rx_error(struct net_if *iface) { struct device *dev = net_if_get_device(iface); u32_t val; eth_stats_update_errors_rx(iface); /* Clear the rx_frame buffer, * otherwise it could lead to underflow errors */ sys_write32(0x0, REG_MACRCTL); sys_write32(BIT_MACRCTL_RSTFIFO, REG_MACRCTL); val = BIT_MACRCTL_BADCRC | BIT_MACRCTL_RXEN; sys_write32(val, REG_MACRCTL); } static struct net_pkt *eth_stellaris_rx_pkt(struct device *dev, struct net_if *iface) { int frame_len, bytes_left; struct net_pkt *pkt; u32_t reg_val; u16_t count; u8_t *data; /* * The Ethernet frame received from the hardware has the * following format. The first two bytes contains the ethernet * frame length, followed by the actual ethernet frame. * * +---------+---- ... -------+ * | Length | Ethernet Frame | * +---------+---- ... -------+ */ /* * The first word contains the frame length and a portion of * the ethernet frame. Extract the frame length. */ reg_val = sys_read32(REG_MACDATA); frame_len = reg_val & 0x0000ffff; pkt = net_pkt_rx_alloc_with_buffer(iface, frame_len, AF_UNSPEC, 0, K_NO_WAIT); if (!pkt) { return NULL; } /* * The remaining 2 bytes, in the first word is appended to the * ethernet frame. */ count = 2U; data = (u8_t *)®_val + 2; if (net_pkt_write(pkt, data, count)) { goto error; } /* A word has been read already, thus minus 4 bytes to be read. */ bytes_left = frame_len - 4; /* Read the rest of words, minus the partial word and FCS byte. */ for (; bytes_left > 7; bytes_left -= 4) { reg_val = sys_read32(REG_MACDATA); count = 4U; data = (u8_t *)®_val; if (net_pkt_write(pkt, data, count)) { goto error; } } /* Handle the last partial word and discard the 4 Byte FCS. */ while (bytes_left > 0) { /* Read the partial word. */ reg_val = sys_read32(REG_MACDATA); /* Discard the last FCS word. */ if (bytes_left <= 4) { bytes_left = 0; break; } count = bytes_left - 4; data = (u8_t *)®_val; if (net_pkt_write(pkt, data, count)) { goto error; } bytes_left -= 4; } return pkt; error: net_pkt_unref(pkt); return NULL; } static void eth_stellaris_rx(struct device *dev) { struct eth_stellaris_runtime *dev_data = DEV_DATA(dev); struct net_if *iface = dev_data->iface; struct net_pkt *pkt; pkt = eth_stellaris_rx_pkt(dev, iface); if (!pkt) { LOG_ERR("Failed to read data"); goto err_mem; } if (net_recv_data(iface, pkt) < 0) { LOG_ERR("Failed to place frame in RX Queue"); goto pkt_unref; } return; pkt_unref: net_pkt_unref(pkt); err_mem: eth_stellaris_rx_error(iface); } static void eth_stellaris_isr(void *arg) { /* Read the interrupt status */ struct device *dev = (struct device *)arg; struct eth_stellaris_runtime *dev_data = DEV_DATA(dev); int isr_val = sys_read32(REG_MACRIS); u32_t lock; lock = irq_lock(); /* Acknowledge the interrupt. */ sys_write32(isr_val, REG_MACRIS); if (isr_val & BIT_MACRIS_RXINT) { eth_stellaris_rx(dev); } if (isr_val & BIT_MACRIS_TXEMP) { dev_data->tx_err = false; k_sem_give(&dev_data->tx_sem); } if (isr_val & BIT_MACRIS_TXER) { LOG_ERR("Transmit Frame Error"); eth_stats_update_errors_tx(dev_data->iface); dev_data->tx_err = true; k_sem_give(&dev_data->tx_sem); } if (isr_val & BIT_MACRIS_RXER) { LOG_ERR("Error Receiving Frame"); eth_stellaris_rx_error(dev_data->iface); } if (isr_val & BIT_MACRIS_FOV) { LOG_ERR("Error Rx Overrun"); eth_stellaris_rx_error(dev_data->iface); } irq_unlock(lock); } static void eth_stellaris_init(struct net_if *iface) { struct device *dev = net_if_get_device(iface); struct eth_stellaris_config *dev_conf = DEV_CFG(dev); struct eth_stellaris_runtime *dev_data = DEV_DATA(dev); dev_data->iface = iface; /* Assign link local address. */ net_if_set_link_addr(iface, dev_data->mac_addr, 6, NET_LINK_ETHERNET); ethernet_init(iface); /* Initialize semaphore. */ k_sem_init(&dev_data->tx_sem, 0, 1); /* Initialize Interrupts. */ dev_conf->config_func(dev); } #if defined(CONFIG_NET_STATISTICS_ETHERNET) static struct net_stats_eth *eth_stellaris_stats(struct device *dev) { return &(DEV_DATA(dev)->stats); } #endif static int eth_stellaris_dev_init(struct device *dev) { u32_t value; /* Assign MAC address to Hardware */ eth_stellaris_assign_mac(dev); /* Program MCRCTL to clear RXFIFO */ value = BIT_MACRCTL_RSTFIFO; sys_write32(value, REG_MACRCTL); /* Enable transmitter */ value = BIT_MACTCTL_DUPLEX | BIT_MACTCTL_CRC | BIT_MACTCTL_PADEN | BIT_MACTCTL_TXEN; sys_write32(value, REG_MACTCTL); /* Enable Receiver */ value = BIT_MACRCTL_BADCRC | BIT_MACRCTL_RXEN; sys_write32(value, REG_MACRCTL); return 0; } static struct device DEVICE_NAME_GET(eth_stellaris); static void eth_stellaris_irq_config(struct device *dev) { /* Enable Interrupt. */ IRQ_CONNECT(DT_ETH_IRQ, DT_ETH_IRQ_PRIO, eth_stellaris_isr, DEVICE_GET(eth_stellaris), 0); irq_enable(DT_ETH_IRQ); } struct eth_stellaris_config eth_cfg = { .mac_base = DT_ETH_BASE_ADDR, .config_func = eth_stellaris_irq_config, }; struct eth_stellaris_runtime eth_data = { .mac_addr = DT_ETH_MAC_ADDR, .tx_err = false, .tx_word = 0, .tx_pos = 0, }; static const struct ethernet_api eth_stellaris_apis = { .iface_api.init = eth_stellaris_init, .send = eth_stellaris_send, #if defined(CONFIG_NET_STATISTICS_ETHERNET) .get_stats = eth_stellaris_stats, #endif }; NET_DEVICE_INIT(eth_stellaris, DT_ETH_DRV_NAME, eth_stellaris_dev_init, ð_data, ð_cfg, CONFIG_ETH_INIT_PRIORITY, ð_stellaris_apis, ETHERNET_L2, NET_L2_GET_CTX_TYPE(ETHERNET_L2), NET_ETH_MTU); |