linux/drivers/net/ethernet/netx-eth.c
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   1/*
   2 * drivers/net/ethernet/netx-eth.c
   3 *
   4 * Copyright (c) 2005 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License version 2
   8 * as published by the Free Software Foundation.
   9 *
  10 * This program is distributed in the hope that it will be useful,
  11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 * GNU General Public License for more details.
  14 *
  15 * You should have received a copy of the GNU General Public License
  16 * along with this program; if not, see <http://www.gnu.org/licenses/>.
  17 */
  18
  19#include <linux/init.h>
  20#include <linux/interrupt.h>
  21#include <linux/module.h>
  22#include <linux/kernel.h>
  23#include <linux/delay.h>
  24
  25#include <linux/netdevice.h>
  26#include <linux/platform_device.h>
  27#include <linux/etherdevice.h>
  28#include <linux/skbuff.h>
  29#include <linux/mii.h>
  30
  31#include <asm/io.h>
  32#include <mach/hardware.h>
  33#include <mach/netx-regs.h>
  34#include <mach/pfifo.h>
  35#include <mach/xc.h>
  36#include <linux/platform_data/eth-netx.h>
  37
  38/* XC Fifo Offsets */
  39#define EMPTY_PTR_FIFO(xcno)    (0 + ((xcno) << 3))     /* Index of the empty pointer FIFO */
  40#define IND_FIFO_PORT_HI(xcno)  (1 + ((xcno) << 3))     /* Index of the FIFO where received */
  41                                                        /* Data packages are indicated by XC */
  42#define IND_FIFO_PORT_LO(xcno)  (2 + ((xcno) << 3))     /* Index of the FIFO where received */
  43                                                        /* Data packages are indicated by XC */
  44#define REQ_FIFO_PORT_HI(xcno)  (3 + ((xcno) << 3))     /* Index of the FIFO where Data packages */
  45                                                        /* have to be indicated by ARM which */
  46                                                        /* shall be sent */
  47#define REQ_FIFO_PORT_LO(xcno)  (4 + ((xcno) << 3))     /* Index of the FIFO where Data packages */
  48                                                        /* have to be indicated by ARM which shall */
  49                                                        /* be sent */
  50#define CON_FIFO_PORT_HI(xcno)  (5 + ((xcno) << 3))     /* Index of the FIFO where sent Data packages */
  51                                                        /* are confirmed */
  52#define CON_FIFO_PORT_LO(xcno)  (6 + ((xcno) << 3))     /* Index of the FIFO where sent Data */
  53                                                        /* packages are confirmed */
  54#define PFIFO_MASK(xcno)        (0x7f << (xcno*8))
  55
  56#define FIFO_PTR_FRAMELEN_SHIFT 0
  57#define FIFO_PTR_FRAMELEN_MASK  (0x7ff << 0)
  58#define FIFO_PTR_FRAMELEN(len)  (((len) << 0) & FIFO_PTR_FRAMELEN_MASK)
  59#define FIFO_PTR_TIMETRIG       (1<<11)
  60#define FIFO_PTR_MULTI_REQ
  61#define FIFO_PTR_ORIGIN         (1<<14)
  62#define FIFO_PTR_VLAN           (1<<15)
  63#define FIFO_PTR_FRAMENO_SHIFT  16
  64#define FIFO_PTR_FRAMENO_MASK   (0x3f << 16)
  65#define FIFO_PTR_FRAMENO(no)    (((no) << 16) & FIFO_PTR_FRAMENO_MASK)
  66#define FIFO_PTR_SEGMENT_SHIFT  22
  67#define FIFO_PTR_SEGMENT_MASK   (0xf << 22)
  68#define FIFO_PTR_SEGMENT(seg)   (((seg) & 0xf) << 22)
  69#define FIFO_PTR_ERROR_SHIFT    28
  70#define FIFO_PTR_ERROR_MASK     (0xf << 28)
  71
  72#define ISR_LINK_STATUS_CHANGE (1<<4)
  73#define ISR_IND_LO             (1<<3)
  74#define ISR_CON_LO             (1<<2)
  75#define ISR_IND_HI             (1<<1)
  76#define ISR_CON_HI             (1<<0)
  77
  78#define ETH_MAC_LOCAL_CONFIG 0x1560
  79#define ETH_MAC_4321         0x1564
  80#define ETH_MAC_65           0x1568
  81
  82#define MAC_TRAFFIC_CLASS_ARRANGEMENT_SHIFT 16
  83#define MAC_TRAFFIC_CLASS_ARRANGEMENT_MASK (0xf<<MAC_TRAFFIC_CLASS_ARRANGEMENT_SHIFT)
  84#define MAC_TRAFFIC_CLASS_ARRANGEMENT(x) (((x)<<MAC_TRAFFIC_CLASS_ARRANGEMENT_SHIFT) & MAC_TRAFFIC_CLASS_ARRANGEMENT_MASK)
  85#define LOCAL_CONFIG_LINK_STATUS_IRQ_EN (1<<24)
  86#define LOCAL_CONFIG_CON_LO_IRQ_EN (1<<23)
  87#define LOCAL_CONFIG_CON_HI_IRQ_EN (1<<22)
  88#define LOCAL_CONFIG_IND_LO_IRQ_EN (1<<21)
  89#define LOCAL_CONFIG_IND_HI_IRQ_EN (1<<20)
  90
  91#define CARDNAME "netx-eth"
  92
  93/* LSB must be zero */
  94#define INTERNAL_PHY_ADR 0x1c
  95
  96struct netx_eth_priv {
  97        void                    __iomem *sram_base, *xpec_base, *xmac_base;
  98        int                     id;
  99        struct mii_if_info      mii;
 100        u32                     msg_enable;
 101        struct xc               *xc;
 102        spinlock_t              lock;
 103};
 104
 105static void netx_eth_set_multicast_list(struct net_device *ndev)
 106{
 107        /* implement me */
 108}
 109
 110static int
 111netx_eth_hard_start_xmit(struct sk_buff *skb, struct net_device *ndev)
 112{
 113        struct netx_eth_priv *priv = netdev_priv(ndev);
 114        unsigned char *buf = skb->data;
 115        unsigned int len = skb->len;
 116
 117        spin_lock_irq(&priv->lock);
 118        memcpy_toio(priv->sram_base + 1560, (void *)buf, len);
 119        if (len < 60) {
 120                memset_io(priv->sram_base + 1560 + len, 0, 60 - len);
 121                len = 60;
 122        }
 123
 124        pfifo_push(REQ_FIFO_PORT_LO(priv->id),
 125                   FIFO_PTR_SEGMENT(priv->id) |
 126                   FIFO_PTR_FRAMENO(1) |
 127                   FIFO_PTR_FRAMELEN(len));
 128
 129        ndev->stats.tx_packets++;
 130        ndev->stats.tx_bytes += skb->len;
 131
 132        netif_stop_queue(ndev);
 133        spin_unlock_irq(&priv->lock);
 134        dev_kfree_skb(skb);
 135
 136        return NETDEV_TX_OK;
 137}
 138
 139static void netx_eth_receive(struct net_device *ndev)
 140{
 141        struct netx_eth_priv *priv = netdev_priv(ndev);
 142        unsigned int val, frameno, seg, len;
 143        unsigned char *data;
 144        struct sk_buff *skb;
 145
 146        val = pfifo_pop(IND_FIFO_PORT_LO(priv->id));
 147
 148        frameno = (val & FIFO_PTR_FRAMENO_MASK) >> FIFO_PTR_FRAMENO_SHIFT;
 149        seg = (val & FIFO_PTR_SEGMENT_MASK) >> FIFO_PTR_SEGMENT_SHIFT;
 150        len = (val & FIFO_PTR_FRAMELEN_MASK) >> FIFO_PTR_FRAMELEN_SHIFT;
 151
 152        skb = netdev_alloc_skb(ndev, len);
 153        if (unlikely(skb == NULL)) {
 154                ndev->stats.rx_dropped++;
 155                return;
 156        }
 157
 158        data = skb_put(skb, len);
 159
 160        memcpy_fromio(data, priv->sram_base + frameno * 1560, len);
 161
 162        pfifo_push(EMPTY_PTR_FIFO(priv->id),
 163                FIFO_PTR_SEGMENT(seg) | FIFO_PTR_FRAMENO(frameno));
 164
 165        skb->protocol = eth_type_trans(skb, ndev);
 166        netif_rx(skb);
 167        ndev->stats.rx_packets++;
 168        ndev->stats.rx_bytes += len;
 169}
 170
 171static irqreturn_t
 172netx_eth_interrupt(int irq, void *dev_id)
 173{
 174        struct net_device *ndev = dev_id;
 175        struct netx_eth_priv *priv = netdev_priv(ndev);
 176        int status;
 177        unsigned long flags;
 178
 179        spin_lock_irqsave(&priv->lock, flags);
 180
 181        status = readl(NETX_PFIFO_XPEC_ISR(priv->id));
 182        while (status) {
 183                int fill_level;
 184                writel(status, NETX_PFIFO_XPEC_ISR(priv->id));
 185
 186                if ((status & ISR_CON_HI) || (status & ISR_IND_HI))
 187                        printk("%s: unexpected status: 0x%08x\n",
 188                            __func__, status);
 189
 190                fill_level =
 191                    readl(NETX_PFIFO_FILL_LEVEL(IND_FIFO_PORT_LO(priv->id)));
 192                while (fill_level--)
 193                        netx_eth_receive(ndev);
 194
 195                if (status & ISR_CON_LO)
 196                        netif_wake_queue(ndev);
 197
 198                if (status & ISR_LINK_STATUS_CHANGE)
 199                        mii_check_media(&priv->mii, netif_msg_link(priv), 1);
 200
 201                status = readl(NETX_PFIFO_XPEC_ISR(priv->id));
 202        }
 203        spin_unlock_irqrestore(&priv->lock, flags);
 204        return IRQ_HANDLED;
 205}
 206
 207static int netx_eth_open(struct net_device *ndev)
 208{
 209        struct netx_eth_priv *priv = netdev_priv(ndev);
 210
 211        if (request_irq
 212            (ndev->irq, netx_eth_interrupt, IRQF_SHARED, ndev->name, ndev))
 213                return -EAGAIN;
 214
 215        writel(ndev->dev_addr[0] |
 216               ndev->dev_addr[1]<<8 |
 217               ndev->dev_addr[2]<<16 |
 218               ndev->dev_addr[3]<<24,
 219               priv->xpec_base + NETX_XPEC_RAM_START_OFS + ETH_MAC_4321);
 220        writel(ndev->dev_addr[4] |
 221               ndev->dev_addr[5]<<8,
 222               priv->xpec_base + NETX_XPEC_RAM_START_OFS + ETH_MAC_65);
 223
 224        writel(LOCAL_CONFIG_LINK_STATUS_IRQ_EN |
 225                LOCAL_CONFIG_CON_LO_IRQ_EN |
 226                LOCAL_CONFIG_CON_HI_IRQ_EN |
 227                LOCAL_CONFIG_IND_LO_IRQ_EN |
 228                LOCAL_CONFIG_IND_HI_IRQ_EN,
 229                priv->xpec_base + NETX_XPEC_RAM_START_OFS +
 230                ETH_MAC_LOCAL_CONFIG);
 231
 232        mii_check_media(&priv->mii, netif_msg_link(priv), 1);
 233        netif_start_queue(ndev);
 234
 235        return 0;
 236}
 237
 238static int netx_eth_close(struct net_device *ndev)
 239{
 240        struct netx_eth_priv *priv = netdev_priv(ndev);
 241
 242        netif_stop_queue(ndev);
 243
 244        writel(0,
 245            priv->xpec_base + NETX_XPEC_RAM_START_OFS + ETH_MAC_LOCAL_CONFIG);
 246
 247        free_irq(ndev->irq, ndev);
 248
 249        return 0;
 250}
 251
 252static void netx_eth_timeout(struct net_device *ndev)
 253{
 254        struct netx_eth_priv *priv = netdev_priv(ndev);
 255        int i;
 256
 257        printk(KERN_ERR "%s: transmit timed out, resetting\n", ndev->name);
 258
 259        spin_lock_irq(&priv->lock);
 260
 261        xc_reset(priv->xc);
 262        xc_start(priv->xc);
 263
 264        for (i=2; i<=18; i++)
 265                pfifo_push(EMPTY_PTR_FIFO(priv->id),
 266                        FIFO_PTR_FRAMENO(i) | FIFO_PTR_SEGMENT(priv->id));
 267
 268        spin_unlock_irq(&priv->lock);
 269
 270        netif_wake_queue(ndev);
 271}
 272
 273static int
 274netx_eth_phy_read(struct net_device *ndev, int phy_id, int reg)
 275{
 276        unsigned int val;
 277
 278        val = MIIMU_SNRDY | MIIMU_PREAMBLE | MIIMU_PHYADDR(phy_id) |
 279              MIIMU_REGADDR(reg) | MIIMU_PHY_NRES;
 280
 281        writel(val, NETX_MIIMU);
 282        while (readl(NETX_MIIMU) & MIIMU_SNRDY);
 283
 284        return readl(NETX_MIIMU) >> 16;
 285
 286}
 287
 288static void
 289netx_eth_phy_write(struct net_device *ndev, int phy_id, int reg, int value)
 290{
 291        unsigned int val;
 292
 293        val = MIIMU_SNRDY | MIIMU_PREAMBLE | MIIMU_PHYADDR(phy_id) |
 294              MIIMU_REGADDR(reg) | MIIMU_PHY_NRES | MIIMU_OPMODE_WRITE |
 295              MIIMU_DATA(value);
 296
 297        writel(val, NETX_MIIMU);
 298        while (readl(NETX_MIIMU) & MIIMU_SNRDY);
 299}
 300
 301static const struct net_device_ops netx_eth_netdev_ops = {
 302        .ndo_open               = netx_eth_open,
 303        .ndo_stop               = netx_eth_close,
 304        .ndo_start_xmit         = netx_eth_hard_start_xmit,
 305        .ndo_tx_timeout         = netx_eth_timeout,
 306        .ndo_set_rx_mode        = netx_eth_set_multicast_list,
 307        .ndo_change_mtu         = eth_change_mtu,
 308        .ndo_validate_addr      = eth_validate_addr,
 309        .ndo_set_mac_address    = eth_mac_addr,
 310};
 311
 312static int netx_eth_enable(struct net_device *ndev)
 313{
 314        struct netx_eth_priv *priv = netdev_priv(ndev);
 315        unsigned int mac4321, mac65;
 316        int running, i;
 317
 318        ndev->netdev_ops = &netx_eth_netdev_ops;
 319        ndev->watchdog_timeo = msecs_to_jiffies(5000);
 320
 321        priv->msg_enable       = NETIF_MSG_LINK;
 322        priv->mii.phy_id_mask  = 0x1f;
 323        priv->mii.reg_num_mask = 0x1f;
 324        priv->mii.force_media  = 0;
 325        priv->mii.full_duplex  = 0;
 326        priv->mii.dev        = ndev;
 327        priv->mii.mdio_read    = netx_eth_phy_read;
 328        priv->mii.mdio_write   = netx_eth_phy_write;
 329        priv->mii.phy_id = INTERNAL_PHY_ADR + priv->id;
 330
 331        running = xc_running(priv->xc);
 332        xc_stop(priv->xc);
 333
 334        /* if the xc engine is already running, assume the bootloader has
 335         * loaded the firmware for us
 336         */
 337        if (running) {
 338                /* get Node Address from hardware */
 339                mac4321 = readl(priv->xpec_base +
 340                        NETX_XPEC_RAM_START_OFS + ETH_MAC_4321);
 341                mac65 = readl(priv->xpec_base +
 342                        NETX_XPEC_RAM_START_OFS + ETH_MAC_65);
 343
 344                ndev->dev_addr[0] = mac4321 & 0xff;
 345                ndev->dev_addr[1] = (mac4321 >> 8) & 0xff;
 346                ndev->dev_addr[2] = (mac4321 >> 16) & 0xff;
 347                ndev->dev_addr[3] = (mac4321 >> 24) & 0xff;
 348                ndev->dev_addr[4] = mac65 & 0xff;
 349                ndev->dev_addr[5] = (mac65 >> 8) & 0xff;
 350        } else {
 351                if (xc_request_firmware(priv->xc)) {
 352                        printk(CARDNAME ": requesting firmware failed\n");
 353                        return -ENODEV;
 354                }
 355        }
 356
 357        xc_reset(priv->xc);
 358        xc_start(priv->xc);
 359
 360        if (!is_valid_ether_addr(ndev->dev_addr))
 361                printk("%s: Invalid ethernet MAC address.  Please "
 362                       "set using ifconfig\n", ndev->name);
 363
 364        for (i=2; i<=18; i++)
 365                pfifo_push(EMPTY_PTR_FIFO(priv->id),
 366                        FIFO_PTR_FRAMENO(i) | FIFO_PTR_SEGMENT(priv->id));
 367
 368        return register_netdev(ndev);
 369
 370}
 371
 372static int netx_eth_drv_probe(struct platform_device *pdev)
 373{
 374        struct netx_eth_priv *priv;
 375        struct net_device *ndev;
 376        struct netxeth_platform_data *pdata;
 377        int ret;
 378
 379        ndev = alloc_etherdev(sizeof (struct netx_eth_priv));
 380        if (!ndev) {
 381                ret = -ENOMEM;
 382                goto exit;
 383        }
 384        SET_NETDEV_DEV(ndev, &pdev->dev);
 385
 386        platform_set_drvdata(pdev, ndev);
 387
 388        priv = netdev_priv(ndev);
 389
 390        pdata = dev_get_platdata(&pdev->dev);
 391        priv->xc = request_xc(pdata->xcno, &pdev->dev);
 392        if (!priv->xc) {
 393                dev_err(&pdev->dev, "unable to request xc engine\n");
 394                ret = -ENODEV;
 395                goto exit_free_netdev;
 396        }
 397
 398        ndev->irq = priv->xc->irq;
 399        priv->id = pdev->id;
 400        priv->xpec_base = priv->xc->xpec_base;
 401        priv->xmac_base = priv->xc->xmac_base;
 402        priv->sram_base = priv->xc->sram_base;
 403
 404        spin_lock_init(&priv->lock);
 405
 406        ret = pfifo_request(PFIFO_MASK(priv->id));
 407        if (ret) {
 408                printk("unable to request PFIFO\n");
 409                goto exit_free_xc;
 410        }
 411
 412        ret = netx_eth_enable(ndev);
 413        if (ret)
 414                goto exit_free_pfifo;
 415
 416        return 0;
 417exit_free_pfifo:
 418        pfifo_free(PFIFO_MASK(priv->id));
 419exit_free_xc:
 420        free_xc(priv->xc);
 421exit_free_netdev:
 422        free_netdev(ndev);
 423exit:
 424        return ret;
 425}
 426
 427static int netx_eth_drv_remove(struct platform_device *pdev)
 428{
 429        struct net_device *ndev = platform_get_drvdata(pdev);
 430        struct netx_eth_priv *priv = netdev_priv(ndev);
 431
 432        unregister_netdev(ndev);
 433        xc_stop(priv->xc);
 434        free_xc(priv->xc);
 435        free_netdev(ndev);
 436        pfifo_free(PFIFO_MASK(priv->id));
 437
 438        return 0;
 439}
 440
 441static int netx_eth_drv_suspend(struct platform_device *pdev, pm_message_t state)
 442{
 443        dev_err(&pdev->dev, "suspend not implemented\n");
 444        return 0;
 445}
 446
 447static int netx_eth_drv_resume(struct platform_device *pdev)
 448{
 449        dev_err(&pdev->dev, "resume not implemented\n");
 450        return 0;
 451}
 452
 453static struct platform_driver netx_eth_driver = {
 454        .probe          = netx_eth_drv_probe,
 455        .remove         = netx_eth_drv_remove,
 456        .suspend        = netx_eth_drv_suspend,
 457        .resume         = netx_eth_drv_resume,
 458        .driver         = {
 459                .name   = CARDNAME,
 460        },
 461};
 462
 463static int __init netx_eth_init(void)
 464{
 465        unsigned int phy_control, val;
 466
 467        printk("NetX Ethernet driver\n");
 468
 469        phy_control = PHY_CONTROL_PHY_ADDRESS(INTERNAL_PHY_ADR>>1) |
 470                      PHY_CONTROL_PHY1_MODE(PHY_MODE_ALL) |
 471                      PHY_CONTROL_PHY1_AUTOMDIX |
 472                      PHY_CONTROL_PHY1_EN |
 473                      PHY_CONTROL_PHY0_MODE(PHY_MODE_ALL) |
 474                      PHY_CONTROL_PHY0_AUTOMDIX |
 475                      PHY_CONTROL_PHY0_EN |
 476                      PHY_CONTROL_CLK_XLATIN;
 477
 478        val = readl(NETX_SYSTEM_IOC_ACCESS_KEY);
 479        writel(val, NETX_SYSTEM_IOC_ACCESS_KEY);
 480
 481        writel(phy_control | PHY_CONTROL_RESET, NETX_SYSTEM_PHY_CONTROL);
 482        udelay(100);
 483
 484        val = readl(NETX_SYSTEM_IOC_ACCESS_KEY);
 485        writel(val, NETX_SYSTEM_IOC_ACCESS_KEY);
 486
 487        writel(phy_control, NETX_SYSTEM_PHY_CONTROL);
 488
 489        return platform_driver_register(&netx_eth_driver);
 490}
 491
 492static void __exit netx_eth_cleanup(void)
 493{
 494        platform_driver_unregister(&netx_eth_driver);
 495}
 496
 497module_init(netx_eth_init);
 498module_exit(netx_eth_cleanup);
 499
 500MODULE_AUTHOR("Sascha Hauer, Pengutronix");
 501MODULE_LICENSE("GPL");
 502MODULE_ALIAS("platform:" CARDNAME);
 503MODULE_FIRMWARE("xc0.bin");
 504MODULE_FIRMWARE("xc1.bin");
 505MODULE_FIRMWARE("xc2.bin");
 506
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