dscc4.c
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上传日期:2013-02-24
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文件大小:46k
- /*
- * drivers/net/wan/dscc4/dscc4_main.c: a DSCC4 HDLC driver for Linux
- *
- * This software may be used and distributed according to the terms of the
- * GNU General Public License.
- *
- * The author may be reached as romieu@cogenit.fr.
- * Specific bug reports/asian food will be welcome.
- *
- * Special thanks to the nice people at CS-Telecom for the hardware and the
- * access to the test/measure tools.
- *
- *
- * Theory of Operation
- *
- * I. Board Compatibility
- *
- * This device driver is designed for the Siemens PEB20534 4 ports serial
- * controller as found on Etinc PCISYNC cards. The documentation for the
- * chipset is available at http://www.infineon.com:
- * - Data Sheet "DSCC4, DMA Supported Serial Communication Controller with
- * 4 Channels, PEB 20534 Version 2.1, PEF 20534 Version 2.1";
- * - Application Hint "Management of DSCC4 on-chip FIFO resources".
- * Jens David has built an adapter based on the same chipset. Take a look
- * at http://www.afthd.tu-darmstadt.de/~dg1kjd/pciscc4 for a specific
- * driver.
- * Sample code (2 revisions) is available at Infineon.
- *
- * II. Board-specific settings
- *
- * Pcisync can transmit some clock signal to the outside world on the
- * *first two* ports provided you put a quartz and a line driver on it and
- * remove the jumpers. The operation is described on Etinc web site. If you
- * go DCE on these ports, don't forget to use an adequate cable.
- *
- * Sharing of the PCI interrupt line for this board is possible.
- *
- * III. Driver operation
- *
- * The rx/tx operations are based on a linked list of descriptor. I haven't
- * tried the start/stop descriptor method as this one looks like the cheapest
- * in terms of PCI manipulation.
- *
- * Tx direction
- * Once the data section of the current descriptor processed, the next linked
- * descriptor is loaded if the HOLD bit isn't set in the current descriptor.
- * If HOLD is met, the transmission is stopped until the host unsets it and
- * signals the change via TxPOLL.
- * When the tx ring is full, the xmit routine issues a call to netdev_stop.
- * The device is supposed to be enabled again during an ALLS irq (we could
- * use HI but as it's easy to loose events, it's fscked).
- *
- * Rx direction
- * The received frames aren't supposed to span over multiple receiving areas.
- * I may implement it some day but it isn't the highest ranked item.
- *
- * IV. Notes
- * The chipset is buggy. Typically, under some specific load patterns (I
- * wouldn't call them "high"), the irq queues and the descriptors look like
- * some event has been lost. Even assuming some fancy PCI feature, it won't
- * explain the reproductible missing "C" bit in the descriptors. Faking an
- * irq in the periodic timer isn't really elegant but at least it seems
- * reliable.
- * The current error (XDU, RFO) recovery code is untested.
- * So far, RDO takes his RX channel down and the right sequence to enable it
- * again is still a mistery. If RDO happens, plan a reboot. More details
- * in the code (NB: as this happens, TX still works).
- * Don't mess the cables during operation, especially on DTE ports. I don't
- * suggest it for DCE either but at least one can get some messages instead
- * of a complete instant freeze.
- * Tests are done on Rev. 20 of the silicium. The RDO handling changes with
- * the documentation/chipset releases. An on-line errata would be welcome.
- *
- * TODO:
- * - some trivial error lurk,
- * - the stats are fscked,
- * - use polling at high irq/s,
- * - performance analysis,
- * - endianness.
- *
- */
- #include <linux/version.h>
- #include <linux/module.h>
- #include <linux/types.h>
- #include <linux/errno.h>
- #include <linux/ioport.h>
- #include <linux/pci.h>
- #include <linux/kernel.h>
- #include <linux/mm.h>
- #include <asm/system.h>
- #include <asm/cache.h>
- #include <asm/byteorder.h>
- #include <asm/uaccess.h>
- #include <asm/io.h>
- #include <asm/irq.h>
- #include <linux/init.h>
- #include <linux/string.h>
- #include <linux/if_arp.h>
- #include <linux/netdevice.h>
- #include <linux/skbuff.h>
- #include <linux/delay.h>
- #include <net/syncppp.h>
- #include <linux/hdlc.h>
- /* Version */
- static const char version[] = "$Id: dscc4.c,v 1.130 2001/02/25 15:27:34 romieu Exp $n";
- static int debug;
- /* Module parameters */
- MODULE_AUTHOR("Maintainer: Francois Romieu <romieu@cogenit.fr>");
- MODULE_DESCRIPTION("Siemens PEB20534 PCI Controller");
- MODULE_LICENSE("GPL");
- MODULE_PARM(debug,"i");
- /* Structures */
- struct TxFD {
- u32 state;
- u32 next;
- u32 data;
- u32 complete;
- u32 jiffies; /* more hack to come :o) */
- };
- struct RxFD {
- u32 state1;
- u32 next;
- u32 data;
- u32 state2;
- u32 end;
- };
- #define DEBUG
- #define DEBUG_PARANOID
- #define TX_RING_SIZE 32
- #define RX_RING_SIZE 32
- #define IRQ_RING_SIZE 64 /* Keep it A multiple of 32 */
- #define TX_TIMEOUT (HZ/10)
- #define BRR_DIVIDER_MAX 64*0x00008000
- #define dev_per_card 4
- #define SOURCE_ID(flags) ((flags >> 28 ) & 0x03)
- #define TO_SIZE(state) ((state >> 16) & 0x1fff)
- #define TO_STATE(len) cpu_to_le32((len & TxSizeMax) << 16)
- #define RX_MAX(len) ((((len) >> 5) + 1) << 5)
- #define SCC_REG_START(id) SCC_START+(id)*SCC_OFFSET
- #undef DEBUG
- struct dscc4_pci_priv {
- u32 *iqcfg;
- int cfg_cur;
- spinlock_t lock;
- struct pci_dev *pdev;
- struct net_device *root;
- dma_addr_t iqcfg_dma;
- u32 xtal_hz;
- };
- struct dscc4_dev_priv {
- struct sk_buff *rx_skbuff[RX_RING_SIZE];
- struct sk_buff *tx_skbuff[TX_RING_SIZE];
- struct RxFD *rx_fd;
- struct TxFD *tx_fd;
- u32 *iqrx;
- u32 *iqtx;
- u32 rx_current;
- u32 tx_current;
- u32 iqrx_current;
- u32 iqtx_current;
- u32 tx_dirty;
- int bad_tx_frame;
- int bad_rx_frame;
- int rx_needs_refill;
- dma_addr_t tx_fd_dma;
- dma_addr_t rx_fd_dma;
- dma_addr_t iqtx_dma;
- dma_addr_t iqrx_dma;
- struct net_device_stats stats;
- struct timer_list timer;
- struct dscc4_pci_priv *pci_priv;
- spinlock_t lock;
- int dev_id;
- u32 flags;
- u32 timer_help;
- u32 hi_expected;
- struct hdlc_device_struct hdlc;
- int usecount;
- };
- /* GLOBAL registers definitions */
- #define GCMDR 0x00
- #define GSTAR 0x04
- #define GMODE 0x08
- #define IQLENR0 0x0C
- #define IQLENR1 0x10
- #define IQRX0 0x14
- #define IQTX0 0x24
- #define IQCFG 0x3c
- #define FIFOCR1 0x44
- #define FIFOCR2 0x48
- #define FIFOCR3 0x4c
- #define FIFOCR4 0x34
- #define CH0CFG 0x50
- #define CH0BRDA 0x54
- #define CH0BTDA 0x58
- /* SCC registers definitions */
- #define SCC_START 0x0100
- #define SCC_OFFSET 0x80
- #define CMDR 0x00
- #define STAR 0x04
- #define CCR0 0x08
- #define CCR1 0x0c
- #define CCR2 0x10
- #define BRR 0x2C
- #define RLCR 0x40
- #define IMR 0x54
- #define ISR 0x58
- /* Bit masks */
- #define IntRxScc0 0x10000000
- #define IntTxScc0 0x01000000
- #define TxPollCmd 0x00000400
- #define RxActivate 0x08000000
- #define MTFi 0x04000000
- #define Rdr 0x00400000
- #define Rdt 0x00200000
- #define Idr 0x00100000
- #define Idt 0x00080000
- #define TxSccRes 0x01000000
- #define RxSccRes 0x00010000
- #define TxSizeMax 0x1ffc
- #define RxSizeMax 0x1ffc
- #define Ccr0ClockMask 0x0000003f
- #define Ccr1LoopMask 0x00000200
- #define BrrExpMask 0x00000f00
- #define BrrMultMask 0x0000003f
- #define EncodingMask 0x00700000
- #define Hold 0x40000000
- #define SccBusy 0x10000000
- #define FrameOk (FrameVfr | FrameCrc)
- #define FrameVfr 0x80
- #define FrameRdo 0x40
- #define FrameCrc 0x20
- #define FrameAborted 0x00000200
- #define FrameEnd 0x80000000
- #define DataComplete 0x40000000
- #define LengthCheck 0x00008000
- #define SccEvt 0x02000000
- #define NoAck 0x00000200
- #define Action 0x00000001
- #define HiDesc 0x20000000
- /* SCC events */
- #define RxEvt 0xf0000000
- #define TxEvt 0x0f000000
- #define Alls 0x00040000
- #define Xdu 0x00010000
- #define Xmr 0x00002000
- #define Xpr 0x00001000
- #define Rdo 0x00000080
- #define Rfs 0x00000040
- #define Rfo 0x00000002
- #define Flex 0x00000001
- /* DMA core events */
- #define Cfg 0x00200000
- #define Hi 0x00040000
- #define Fi 0x00020000
- #define Err 0x00010000
- #define Arf 0x00000002
- #define ArAck 0x00000001
- /* Misc */
- #define NeedIDR 0x00000001
- #define NeedIDT 0x00000002
- #define RdoSet 0x00000004
- /* Functions prototypes */
- static __inline__ void dscc4_rx_irq(struct dscc4_pci_priv *, struct net_device *);
- static __inline__ void dscc4_tx_irq(struct dscc4_pci_priv *, struct net_device *);
- static int dscc4_found1(struct pci_dev *, unsigned long ioaddr);
- static int dscc4_init_one(struct pci_dev *, const struct pci_device_id *ent);
- static int dscc4_open(struct net_device *);
- static int dscc4_start_xmit(struct sk_buff *, struct net_device *);
- static int dscc4_close(struct net_device *);
- static int dscc4_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
- static int dscc4_change_mtu(struct net_device *dev, int mtu);
- static int dscc4_init_ring(struct net_device *);
- static void dscc4_release_ring(struct dscc4_dev_priv *);
- static void dscc4_timer(unsigned long);
- static void dscc4_tx_timeout(struct net_device *);
- static void dscc4_irq(int irq, void *dev_id, struct pt_regs *ptregs);
- static struct net_device_stats *dscc4_get_stats(struct net_device *);
- static int dscc4_attach_hdlc_device(struct net_device *);
- static void dscc4_unattach_hdlc_device(struct net_device *);
- static int dscc4_hdlc_open(struct hdlc_device_struct *);
- static void dscc4_hdlc_close(struct hdlc_device_struct *);
- static int dscc4_hdlc_ioctl(struct hdlc_device_struct *, struct ifreq *, int);
- static int dscc4_hdlc_xmit(hdlc_device *, struct sk_buff *);
- #ifdef EXPERIMENTAL_POLLING
- static int dscc4_tx_poll(struct dscc4_dev_priv *, struct net_device *);
- #endif
- void inline reset_TxFD(struct TxFD *tx_fd) {
- /* FIXME: test with the last arg (size specification) = 0 */
- tx_fd->state = FrameEnd | Hold | 0x00100000;
- tx_fd->complete = 0x00000000;
- }
- void inline dscc4_release_ring_skbuff(struct sk_buff **p, int n)
- {
- for(; n > 0; n--) {
- if (*p)
- dev_kfree_skb(*p);
- p++;
- }
- }
- static void dscc4_release_ring(struct dscc4_dev_priv *dpriv)
- {
- struct pci_dev *pdev = dpriv->pci_priv->pdev;
- pci_free_consistent(pdev, TX_RING_SIZE*sizeof(struct TxFD),
- dpriv->tx_fd, dpriv->tx_fd_dma);
- pci_free_consistent(pdev, RX_RING_SIZE*sizeof(struct RxFD),
- dpriv->rx_fd, dpriv->rx_fd_dma);
- dscc4_release_ring_skbuff(dpriv->tx_skbuff, TX_RING_SIZE);
- dscc4_release_ring_skbuff(dpriv->rx_skbuff, RX_RING_SIZE);
- }
- void inline try_get_rx_skb(struct dscc4_dev_priv *priv, int cur, struct net_device *dev)
- {
- struct sk_buff *skb;
- skb = dev_alloc_skb(RX_MAX(HDLC_MAX_MRU+2));
- priv->rx_skbuff[cur] = skb;
- if (!skb) {
- priv->rx_fd[cur--].data = (u32) NULL;
- priv->rx_fd[cur%RX_RING_SIZE].state1 |= Hold;
- priv->rx_needs_refill++;
- return;
- }
- skb->dev = dev;
- skb->protocol = htons(ETH_P_IP);
- skb->mac.raw = skb->data;
- priv->rx_fd[cur].data = pci_map_single(priv->pci_priv->pdev, skb->data,
- skb->len, PCI_DMA_FROMDEVICE);
- }
- /*
- * IRQ/thread/whatever safe
- */
- static int dscc4_wait_ack_cec(u32 ioaddr, struct net_device *dev, char *msg)
- {
- s16 i = 0;
- while (readl(ioaddr + STAR) & SccBusy) {
- if (i++ < 0) {
- printk(KERN_ERR "%s: %s timeoutn", dev->name, msg);
- return -1;
- }
- }
- printk(KERN_DEBUG "%s: %s ack (%d try)n", dev->name, msg, i);
- return 0;
- }
- static int dscc4_do_action(struct net_device *dev, char *msg)
- {
- unsigned long ioaddr = dev->base_addr;
- u32 state;
- s16 i;
- writel(Action, ioaddr + GCMDR);
- ioaddr += GSTAR;
- for (i = 0; i >= 0; i++) {
- state = readl(ioaddr);
- if (state & Arf) {
- printk(KERN_ERR "%s: %s failedn", dev->name, msg);
- writel(Arf, ioaddr);
- return -1;
- } else if (state & ArAck) {
- printk(KERN_DEBUG "%s: %s ack (%d try)n",
- dev->name, msg, i);
- writel(ArAck, ioaddr);
- return 0;
- }
- }
- printk(KERN_ERR "%s: %s timeoutn", dev->name, msg);
- return -1;
- }
- static __inline__ int dscc4_xpr_ack(struct dscc4_dev_priv *dpriv)
- {
- int cur;
- s16 i;
- cur = dpriv->iqtx_current%IRQ_RING_SIZE;
- for (i = 0; i >= 0; i++) {
- if (!(dpriv->flags & (NeedIDR | NeedIDT)) ||
- (dpriv->iqtx[cur] & Xpr))
- return 0;
- }
- printk(KERN_ERR "%s: %s timeoutn", "dscc4", "XPR");
- return -1;
- }
- static __inline__ void dscc4_rx_skb(struct dscc4_dev_priv *dpriv, int cur,
- struct RxFD *rx_fd, struct net_device *dev)
- {
- struct pci_dev *pdev = dpriv->pci_priv->pdev;
- struct sk_buff *skb;
- int pkt_len;
- skb = dpriv->rx_skbuff[cur];
- pkt_len = TO_SIZE(rx_fd->state2) - 1;
- pci_dma_sync_single(pdev, rx_fd->data, pkt_len + 1, PCI_DMA_FROMDEVICE);
- if((skb->data[pkt_len] & FrameOk) == FrameOk) {
- pci_unmap_single(pdev, rx_fd->data, skb->len, PCI_DMA_FROMDEVICE);
- dpriv->stats.rx_packets++;
- dpriv->stats.rx_bytes += pkt_len;
- skb->tail += pkt_len;
- skb->len = pkt_len;
- if (netif_running(hdlc_to_dev(&dpriv->hdlc)))
- hdlc_netif_rx(&dpriv->hdlc, skb);
- else
- netif_rx(skb);
- try_get_rx_skb(dpriv, cur, dev);
- } else {
- if(skb->data[pkt_len] & FrameRdo)
- dpriv->stats.rx_fifo_errors++;
- else if(!(skb->data[pkt_len] | ~FrameCrc))
- dpriv->stats.rx_crc_errors++;
- else if(!(skb->data[pkt_len] | ~FrameVfr))
- dpriv->stats.rx_length_errors++;
- else
- dpriv->stats.rx_errors++;
- }
- rx_fd->state1 |= Hold;
- rx_fd->state2 = 0x00000000;
- rx_fd->end = 0xbabeface;
- if (!rx_fd->data)
- return;
- rx_fd--;
- if (!cur)
- rx_fd += RX_RING_SIZE;
- rx_fd->state1 &= ~Hold;
- }
- static int __init dscc4_init_one (struct pci_dev *pdev,
- const struct pci_device_id *ent)
- {
- struct dscc4_pci_priv *priv;
- struct dscc4_dev_priv *dpriv;
- int i;
- static int cards_found = 0;
- unsigned long ioaddr;
- printk(KERN_DEBUG "%s", version);
- if (pci_enable_device(pdev))
- goto err_out;
- if (!request_mem_region(pci_resource_start(pdev, 0),
- pci_resource_len(pdev, 0), "registers")) {
- printk (KERN_ERR "dscc4: can't reserve MMIO region (regs)n");
- goto err_out;
- }
- if (!request_mem_region(pci_resource_start(pdev, 1),
- pci_resource_len(pdev, 1), "LBI interface")) {
- printk (KERN_ERR "dscc4: can't reserve MMIO region (lbi)n");
- goto err_out_free_mmio_region0;
- }
- ioaddr = (unsigned long)ioremap(pci_resource_start(pdev, 0),
- pci_resource_len(pdev, 0));
- if (!ioaddr) {
- printk(KERN_ERR "dscc4: cannot remap MMIO region %lx @ %lxn",
- pci_resource_len(pdev, 0), pci_resource_start(pdev, 0));
- goto err_out_free_mmio_region;
- }
- printk(KERN_DEBUG "Siemens DSCC4, MMIO at %#lx (regs), %#lx (lbi), IRQ %d.n",
- pci_resource_start(pdev, 0),
- pci_resource_start(pdev, 1), pdev->irq);
- /* High PCI latency useless. Cf app. note. */
- pci_write_config_byte(pdev, PCI_LATENCY_TIMER, 0x10);
- pci_set_master(pdev);
- if (dscc4_found1(pdev, ioaddr))
- goto err_out_iounmap;
- priv = (struct dscc4_pci_priv *)pci_get_drvdata(pdev);
- if (request_irq(pdev->irq, &dscc4_irq, SA_SHIRQ, "dscc4", priv->root)) {
- printk(KERN_WARNING "dscc4: IRQ %d is busyn", pdev->irq);
- goto err_out_iounmap;
- }
- priv->pdev = pdev;
- /* power up/little endian/dma core controlled via hold bit */
- writel(0x00000000, ioaddr + GMODE);
- /* Shared interrupt queue */
- {
- u32 bits;
- bits = (IRQ_RING_SIZE >> 5) - 1;
- bits |= bits << 4;
- bits |= bits << 8;
- bits |= bits << 16;
- writel(bits, ioaddr + IQLENR0);
- }
- /* Global interrupt queue */
- writel((u32)(((IRQ_RING_SIZE >> 5) - 1) << 20), ioaddr + IQLENR1);
- priv->iqcfg = (u32 *) pci_alloc_consistent(pdev,
- IRQ_RING_SIZE*sizeof(u32), &priv->iqcfg_dma);
- if (!priv->iqcfg)
- goto err_out_free_irq;
- writel(priv->iqcfg_dma, ioaddr + IQCFG);
- /*
- * SCC 0-3 private rx/tx irq structures
- * IQRX/TXi needs to be set soon. Learned it the hard way...
- */
- for(i = 0; i < dev_per_card; i++) {
- dpriv = (struct dscc4_dev_priv *)(priv->root + i)->priv;
- dpriv->iqtx = (u32 *) pci_alloc_consistent(pdev,
- IRQ_RING_SIZE*sizeof(u32), &dpriv->iqtx_dma);
- if (!dpriv->iqtx)
- goto err_out_free_iqtx;
- writel(dpriv->iqtx_dma, ioaddr + IQTX0 + i*4);
- }
- for(i = 0; i < dev_per_card; i++) {
- dpriv = (struct dscc4_dev_priv *)(priv->root + i)->priv;
- dpriv->iqrx = (u32 *) pci_alloc_consistent(pdev,
- IRQ_RING_SIZE*sizeof(u32), &dpriv->iqrx_dma);
- if (!dpriv->iqrx)
- goto err_out_free_iqrx;
- writel(dpriv->iqrx_dma, ioaddr + IQRX0 + i*4);
- }
- /*
- * Cf application hint. Beware of hard-lock condition on
- * threshold .
- */
- writel(0x42104000, ioaddr + FIFOCR1);
- //writel(0x9ce69800, ioaddr + FIFOCR2);
- writel(0xdef6d800, ioaddr + FIFOCR2);
- //writel(0x11111111, ioaddr + FIFOCR4);
- writel(0x18181818, ioaddr + FIFOCR4);
- // FIXME: should depend on the chipset revision
- writel(0x0000000e, ioaddr + FIFOCR3);
- writel(0xff200001, ioaddr + GCMDR);
- cards_found++;
- return 0;
- err_out_free_iqrx:
- while (--i >= 0) {
- dpriv = (struct dscc4_dev_priv *)(priv->root + i)->priv;
- pci_free_consistent(pdev, IRQ_RING_SIZE*sizeof(u32),
- dpriv->iqrx, dpriv->iqrx_dma);
- }
- i = dev_per_card;
- err_out_free_iqtx:
- while (--i >= 0) {
- dpriv = (struct dscc4_dev_priv *)(priv->root + i)->priv;
- pci_free_consistent(pdev, IRQ_RING_SIZE*sizeof(u32),
- dpriv->iqtx, dpriv->iqtx_dma);
- }
- pci_free_consistent(pdev, IRQ_RING_SIZE*sizeof(u32), priv->iqcfg,
- priv->iqcfg_dma);
- err_out_free_irq:
- free_irq(pdev->irq, priv->root);
- err_out_iounmap:
- iounmap ((void *)ioaddr);
- err_out_free_mmio_region:
- release_mem_region(pci_resource_start(pdev, 1),
- pci_resource_len(pdev, 1));
- err_out_free_mmio_region0:
- release_mem_region(pci_resource_start(pdev, 0),
- pci_resource_len(pdev, 0));
- err_out:
- return -ENODEV;
- };
- static int dscc4_found1(struct pci_dev *pdev, unsigned long ioaddr)
- {
- struct dscc4_pci_priv *ppriv;
- struct dscc4_dev_priv *dpriv;
- struct net_device *dev;
- int i = 0;
- dpriv = (struct dscc4_dev_priv *)
- kmalloc(dev_per_card*sizeof(struct dscc4_dev_priv), GFP_KERNEL);
- if (!dpriv) {
- printk(KERN_ERR "dscc4: can't allocate datan");
- goto err_out;
- }
- memset(dpriv, 0, dev_per_card*sizeof(struct dscc4_dev_priv));
- dev = (struct net_device *)
- kmalloc(dev_per_card*sizeof(struct net_device), GFP_KERNEL);
- if (!dev) {
- printk(KERN_ERR "dscc4: can't allocate net_devicen");
- goto err_dealloc_priv;
- }
- memset(dev, 0, dev_per_card*sizeof(struct net_device));
- ppriv = (struct dscc4_pci_priv *)
- kmalloc(sizeof(struct dscc4_pci_priv), GFP_KERNEL);
- if (!ppriv) {
- printk(KERN_ERR "dscc4: can't allocate pci private data.n");
- goto err_dealloc_dev;
- }
- memset(ppriv, 0, sizeof(struct dscc4_pci_priv));
- for (i = 0; i < dev_per_card; i++) {
- struct dscc4_dev_priv *p;
- struct net_device *d;
- d = dev + i;
- d->base_addr = ioaddr;
- d->init = NULL;
- d->irq = pdev->irq;
- /* The card adds the crc */
- d->type = ARPHRD_RAWHDLC;
- d->open = dscc4_open;
- d->stop = dscc4_close;
- d->hard_start_xmit = dscc4_start_xmit;
- d->set_multicast_list = NULL;
- d->do_ioctl = dscc4_ioctl;
- d->get_stats = dscc4_get_stats;
- d->change_mtu = dscc4_change_mtu;
- d->mtu = HDLC_MAX_MTU;
- d->flags = IFF_MULTICAST|IFF_POINTOPOINT|IFF_NOARP;
- d->tx_timeout = dscc4_tx_timeout;
- d->watchdog_timeo = TX_TIMEOUT;
- p = dpriv + i;
- p->dev_id = i;
- p->pci_priv = ppriv;
- spin_lock_init(&p->lock);
- d->priv = p;
- if (dev_alloc_name(d, "scc%d")<0) {
- printk(KERN_ERR "dev_alloc_name failed for scc.n");
- goto err_dealloc_dev;
- }
- if (register_netdev(d)) {
- printk(KERN_ERR "%s: register_netdev != 0.n", d->name);
- goto err_dealloc_dev;
- }
- dscc4_attach_hdlc_device(d);
- SET_MODULE_OWNER(d);
- }
- ppriv->root = dev;
- ppriv->pdev = pdev;
- spin_lock_init(&ppriv->lock);
- pci_set_drvdata(pdev, ppriv);
- return 0;
- err_dealloc_dev:
- while (--i >= 0)
- unregister_netdev(dev + i);
- kfree(dev);
- err_dealloc_priv:
- kfree(dpriv);
- err_out:
- return -1;
- };
- static void dscc4_timer(unsigned long data)
- {
- struct net_device *dev = (struct net_device *)data;
- struct dscc4_dev_priv *dpriv;
- struct dscc4_pci_priv *ppriv;
- dpriv = dev->priv;
- if (netif_queue_stopped(dev) &&
- ((jiffies - dev->trans_start) > TX_TIMEOUT)) {
- ppriv = dpriv->pci_priv;
- if (dpriv->iqtx[dpriv->iqtx_current%IRQ_RING_SIZE]) {
- u32 flags;
- printk(KERN_DEBUG "%s: pending eventsn", dev->name);
- dev->trans_start = jiffies;
- spin_lock_irqsave(&ppriv->lock, flags);
- dscc4_tx_irq(ppriv, dev);
- spin_unlock_irqrestore(&ppriv->lock, flags);
- } else {
- struct TxFD *tx_fd;
- struct sk_buff *skb;
- int i,j;
- printk(KERN_DEBUG "%s: missing eventsn", dev->name);
- i = dpriv->tx_dirty%TX_RING_SIZE;
- j = dpriv->tx_current - dpriv->tx_dirty;
- dpriv->stats.tx_dropped += j;
- while(j--) {
- skb = dpriv->tx_skbuff[i];
- tx_fd = dpriv->tx_fd + i;
- if (skb) {
- dpriv->tx_skbuff[i] = NULL;
- pci_unmap_single(ppriv->pdev, tx_fd->data, skb->len,
- PCI_DMA_TODEVICE);
- dev_kfree_skb_irq(skb);
- } else
- printk(KERN_INFO "%s: hardware on drugs!n", dev->name);
- tx_fd->data = 0; /* DEBUG */
- tx_fd->complete &= ~DataComplete;
- i++;
- i %= TX_RING_SIZE;
- }
- dpriv->tx_dirty = dpriv->tx_current;
- dev->trans_start = jiffies;
- netif_wake_queue(dev);
- printk(KERN_DEBUG "%s: re-enabledn", dev->name);
- }
- }
- dpriv->timer.expires = jiffies + TX_TIMEOUT;
- add_timer(&dpriv->timer);
- }
- static void dscc4_tx_timeout(struct net_device *dev)
- {
- /* FIXME: something is missing there */
- };
- static int dscc4_open(struct net_device *dev)
- {
- struct dscc4_dev_priv *dpriv = (struct dscc4_dev_priv *)dev->priv;
- struct dscc4_pci_priv *ppriv;
- u32 ioaddr = 0;
- MOD_INC_USE_COUNT;
- ppriv = dpriv->pci_priv;
- if (dscc4_init_ring(dev))
- goto err_out;
- ioaddr = dev->base_addr + SCC_REG_START(dpriv->dev_id);
- /* FIXME: VIS */
- writel(readl(ioaddr + CCR0) | 0x80001000, ioaddr + CCR0);
- writel(LengthCheck | (HDLC_MAX_MRU >> 5), ioaddr + RLCR);
- /* no address recognition/crc-CCITT/cts enabled */
- writel(readl(ioaddr + CCR1) | 0x021c8000, ioaddr + CCR1);
- /* Ccr2.Rac = 0 */
- writel(0x00050008 & ~RxActivate, ioaddr + CCR2);
- #ifdef EXPERIMENTAL_POLLING
- writel(0xfffeef7f, ioaddr + IMR); /* Interrupt mask */
- #else
- /* Don't mask RDO. Ever. */
- //writel(0xfffaef7f, ioaddr + IMR); /* Interrupt mask */
- writel(0xfffaef7e, ioaddr + IMR); /* Interrupt mask */
- #endif
- /* IDT+IDR during XPR */
- dpriv->flags = NeedIDR | NeedIDT;
- /*
- * The following is a bit paranoid...
- *
- * NB: the datasheet "...CEC will stay active if the SCC is in
- * power-down mode or..." and CCR2.RAC = 1 are two different
- * situations.
- */
- if (readl(ioaddr + STAR) & SccBusy) {
- printk(KERN_ERR "%s busy. Try latern", dev->name);
- goto err_free_ring;
- }
- writel(TxSccRes | RxSccRes, ioaddr + CMDR);
- /* ... the following isn't */
- if (dscc4_wait_ack_cec(ioaddr, dev, "Cec"))
- goto err_free_ring;
- /*
- * I would expect XPR near CE completion (before ? after ?).
- * At worst, this code won't see a late XPR and people
- * will have to re-issue an ifconfig (this is harmless).
- * WARNING, a really missing XPR usually means a hardware
- * reset is needed. Suggestions anyone ?
- */
- if (dscc4_xpr_ack(dpriv))
- goto err_free_ring;
-
- netif_start_queue(dev);
- init_timer(&dpriv->timer);
- dpriv->timer.expires = jiffies + 10*HZ;
- dpriv->timer.data = (unsigned long)dev;
- dpriv->timer.function = &dscc4_timer;
- add_timer(&dpriv->timer);
- netif_carrier_on(dev);
- return 0;
- err_free_ring:
- dscc4_release_ring(dpriv);
- err_out:
- MOD_DEC_USE_COUNT;
- return -EAGAIN;
- }
- #ifdef EXPERIMENTAL_POLLING
- static int dscc4_tx_poll(struct dscc4_dev_priv *dpriv, struct net_device *dev)
- {
- /* FIXME: it's gonna be easy (TM), for sure */
- }
- #endif /* EXPERIMENTAL_POLLING */
- static int dscc4_start_xmit(struct sk_buff *skb, struct net_device *dev)
- {
- struct dscc4_dev_priv *dpriv = dev->priv;
- struct dscc4_pci_priv *ppriv;
- struct TxFD *tx_fd;
- int cur, next;
- ppriv = dpriv->pci_priv;
- cur = dpriv->tx_current++%TX_RING_SIZE;
- next = dpriv->tx_current%TX_RING_SIZE;
- dpriv->tx_skbuff[next] = skb;
- tx_fd = dpriv->tx_fd + next;
- tx_fd->state = FrameEnd | Hold | TO_STATE(skb->len & TxSizeMax);
- tx_fd->data = pci_map_single(ppriv->pdev, skb->data, skb->len,
- PCI_DMA_TODEVICE);
- tx_fd->complete = 0x00000000;
- mb(); // FIXME: suppress ?
- #ifdef EXPERIMENTAL_POLLING
- spin_lock(&dpriv->lock);
- while(dscc4_tx_poll(dpriv, dev));
- spin_unlock(&dpriv->lock);
- #endif
- /*
- * I know there's a window for a race in the following lines but
- * dscc4_timer will take good care of it. The chipset eats events
- * (especially the net_dev re-enabling ones) thus there is no
- * reason to try and be smart.
- */
- if ((dpriv->tx_dirty + 16) < dpriv->tx_current) {
- netif_stop_queue(dev);
- dpriv->hi_expected = 2;
- }
- tx_fd = dpriv->tx_fd + cur;
- tx_fd->state &= ~Hold;
- mb(); // FIXME: suppress ?
- /*
- * One may avoid some pci transactions during intense TX periods.
- * Not sure it's worth the pain...
- */
- writel((TxPollCmd << dpriv->dev_id) | NoAck, dev->base_addr + GCMDR);
- dev->trans_start = jiffies;
- return 0;
- }
- static int dscc4_close(struct net_device *dev)
- {
- struct dscc4_dev_priv *dpriv = (struct dscc4_dev_priv *)dev->priv;
- u32 ioaddr = dev->base_addr;
- int dev_id;
- del_timer_sync(&dpriv->timer);
- netif_stop_queue(dev);
- dev_id = dpriv->dev_id;
- writel(0x00050000, ioaddr + SCC_REG_START(dev_id) + CCR2);
- writel(MTFi|Rdr|Rdt, ioaddr + CH0CFG + dev_id*0x0c); /* Reset Rx/Tx */
- writel(0x00000001, ioaddr + GCMDR);
- dscc4_release_ring(dpriv);
- MOD_DEC_USE_COUNT;
- return 0;
- }
- static int dscc4_set_clock(struct net_device *dev, u32 *bps, u32 *state)
- {
- struct dscc4_dev_priv *dpriv = (struct dscc4_dev_priv *)dev->priv;
- u32 brr;
- *state &= ~Ccr0ClockMask;
- if (*bps) { /* DCE */
- u32 n = 0, m = 0, divider;
- int xtal;
- xtal = dpriv->pci_priv->xtal_hz;
- if (!xtal)
- return -1;
- divider = xtal / *bps;
- if (divider > BRR_DIVIDER_MAX) {
- divider >>= 4;
- *state |= 0x00000036; /* Clock mode 6b (BRG/16) */
- } else
- *state |= 0x00000037; /* Clock mode 7b (BRG) */
- if (divider >> 22) {
- n = 63;
- m = 15;
- } else if (divider) {
- /* Extraction of the 6 highest weighted bits */
- m = 0;
- while (0xffffffc0 & divider) {
- m++;
- divider >>= 1;
- }
- n = divider;
- }
- brr = (m << 8) | n;
- divider = n << m;
- if (!(*state & 0x00000001)) /* Clock mode 6b */
- divider <<= 4;
- *bps = xtal / divider;
- } else { /* DTE */
- /*
- * "state" already reflects Clock mode 0a.
- * Nothing more to be done
- */
- brr = 0;
- }
- writel(brr, dev->base_addr + BRR + SCC_REG_START(dpriv->dev_id));
- return 0;
- }
- #ifdef LATER_PLEASE
- /*
- * -*- [RFC] Configuring Synchronous Interfaces in Linux -*-
- */
- // FIXME: MEDIA already defined in linux/hdlc.h
- #define HDLC_MEDIA_V35 0
- #define HDLC_MEDIA_RS232 1
- #define HDLC_MEDIA_X21 2
- #define HDLC_MEDIA_E1 3
- #define HDLC_MEDIA_HSSI 4
- #define HDLC_CODING_NRZ 0
- #define HDLC_CODING_NRZI 1
- #define HDLC_CODING_FM0 2
- #define HDLC_CODING_FM1 3
- #define HDLC_CODING_MANCHESTER 4
- #define HDLC_CRC_NONE 0
- #define HDLC_CRC_16 1
- #define HDLC_CRC_32 2
- #define HDLC_CRC_CCITT 3
- /* RFC: add the crc reset value ? */
- struct hdlc_physical {
- u8 media;
- u8 coding;
- u32 rate;
- u8 crc;
- u8 crc_siz; /* 2 or 4 bytes */
- u8 shared_flags; /* Discouraged on the DSCC4 */
- };
- // FIXME: PROTO already defined in linux/hdlc.h
- #define HDLC_PROTO_RAW 0
- #define HDLC_PROTO_FR 1
- #define HDLC_PROTO_X25 2
- #define HDLC_PROTO_PPP 3
- #define HDLC_PROTO_CHDLC 4
- struct hdlc_protocol {
- u8 proto;
-
- union {
- } u;
- };
- struct screq {
- u16 media_group;
- union {
- struct hdlc_physical hdlc_phy;
- struct hdlc_protocol hdlc_proto;
- } u;
- };
- // FIXME: go sub-module
- static struct {
- u16 coding;
- u16 bits;
- } map[] = {
- {HDLC_CODING_NRZ, 0x00},
- {HDLC_CODING_NRZI, 0x20},
- {HDLC_CODING_FM0, 0x40},
- {HDLC_CODING_FM1, 0x50},
- {HDLC_CODING_MANCHESTER, 0x60},
- {65535, 0x00}
- };
- #endif /* LATER_PLEASE */
- static int dscc4_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
- {
- struct dscc4_dev_priv *dpriv = dev->priv;
- u32 state, ioaddr;
- if (dev->flags & IFF_UP)
- return -EBUSY;
- switch (cmd) {
- /* Set built-in quartz frequency */
- case SIOCDEVPRIVATE: {
- u32 hz;
- hz = ifr->ifr_ifru.ifru_ivalue;
- if (hz >= 33000000) /* 33 MHz */
- return -EOPNOTSUPP;
- dpriv->pci_priv->xtal_hz = hz;
- return 0;
- }
- /* Set/unset loopback */
- case SIOCDEVPRIVATE+1: {
- u32 flags;
-
- ioaddr = dev->base_addr + CCR1 +
- SCC_REG_START(dpriv->dev_id);
- state = readl(ioaddr);
- flags = ifr->ifr_ifru.ifru_ivalue;
- if (flags & 0x00000001) {
- printk(KERN_DEBUG "%s: loopbackn", dev->name);
- state |= 0x00000100;
- } else {
- printk(KERN_DEBUG "%s: normaln", dev->name);
- state &= ~0x00000100;
- }
- writel(state, ioaddr);
- return 0;
- }
- #ifdef LATER_PLEASE
- case SIOCDEVPRIVATE+2: {
- {
- struct screq scr;
- err = copy_from_user(&scr, ifr->ifr_ifru.ifru_data, sizeof(struct screq));
- if (err)
- return err;
- do {
- if (scr.u.hdlc_phy.coding == map[i].coding)
- break;
- } while (map[++i].coding != 65535);
- if (!map[i].coding)
- return -EOPNOTSUPP;
-
- ioaddr = dev->base_addr + CCR0 +
- SCC_REG_START(dpriv->dev_id);
- state = readl(ioaddr) & ~EncodingMask;
- state |= (u32)map[i].bits << 16;
- writel(state, ioaddr);
- printk("state: %08xn", state); /* DEBUG */
- return 0;
- }
- case SIOCDEVPRIVATE+3: {
- struct screq *scr = (struct screq *)ifr->ifr_ifru.ifru_data;
- ioaddr = dev->base_addr + CCR0 +
- SCC_REG_START(dpriv->dev_id);
- state = (readl(ioaddr) & EncodingMask) >> 16;
- do {
- if (state == map[i].bits)
- break;
- } while (map[++i].coding);
- return put_user(map[i].coding, (u16 *)scr->u.hdlc_phy.coding);
- }
- #endif /* LATER_PLEASE */
- case HDLCSCLOCKRATE:
- {
- u32 state, bps;
-
- bps = ifr->ifr_ifru.ifru_ivalue;
- ioaddr = dev->base_addr + CCR0 +
- SCC_REG_START(dpriv->dev_id);
- state = readl(ioaddr);
- if(dscc4_set_clock(dev, &bps, &state) < 0)
- return -EOPNOTSUPP;
- if (bps) { /* DCE */
- printk(KERN_DEBUG "%s: generated RxClk (DCE)n",
- dev->name);
- ifr->ifr_ifru.ifru_ivalue = bps;
- } else { /* DTE */
- state = 0x80001000;
- printk(KERN_DEBUG "%s: external RxClk (DTE)n",
- dev->name);
- }
- writel(state, ioaddr);
- return 0;
- }
- case HDLCGCLOCKRATE: {
- u32 brr;
- int bps;
- brr = readl(dev->base_addr + BRR +
- SCC_REG_START(dpriv->dev_id));
- bps = dpriv->pci_priv->xtal_hz >> (brr >> 8);
- bps /= (brr & 0x3f) + 1;
- ifr->ifr_ifru.ifru_ivalue = bps;
- return 0;
- }
- default:
- return -EOPNOTSUPP;
- }
- }
- static int dscc4_change_mtu(struct net_device *dev, int mtu)
- {
- /* FIXME: chainsaw coded... */
- if ((mtu <= 3) || (mtu > 65531))
- return -EINVAL;
- if(dev->flags & IFF_UP)
- return -EBUSY;
- dev->mtu = mtu;
- return(0);
- }
- static void dscc4_irq(int irq, void *dev_instance, struct pt_regs *ptregs)
- {
- struct net_device *dev = dev_instance;
- struct dscc4_pci_priv *priv;
- u32 ioaddr, state;
- unsigned long flags;
- int i;
- priv = ((struct dscc4_dev_priv *)dev->priv)->pci_priv;
- /*
- * FIXME: shorten the protected area (set some bit telling we're
- * in an interrupt or increment some work-to-do counter etc...)
- */
- spin_lock_irqsave(&priv->lock, flags);
- ioaddr = dev->base_addr;
- state = readl(ioaddr + GSTAR);
- if (!state)
- goto out;
- writel(state, ioaddr + GSTAR);
- if (state & Arf) {
- printk(KERN_ERR "%s: failure (Arf). Harass the maintenern",
- dev->name);
- goto out;
- }
- state &= ~ArAck;
- if (state & Cfg) {
- if (debug)
- printk(KERN_DEBUG "CfgIVn");
- if (priv->iqcfg[priv->cfg_cur++%IRQ_RING_SIZE] & Arf)
- printk(KERN_ERR "%s: %s failedn", dev->name, "CFG");
- if (!(state &= ~Cfg))
- goto out;
- }
- if (state & RxEvt) {
- i = dev_per_card - 1;
- do {
- dscc4_rx_irq(priv, dev + i);
- } while (--i >= 0);
- state &= ~RxEvt;
- }
- if (state & TxEvt) {
- i = dev_per_card - 1;
- do {
- dscc4_tx_irq(priv, dev + i);
- } while (--i >= 0);
- state &= ~TxEvt;
- }
- out:
- spin_unlock_irqrestore(&priv->lock, flags);
- }
- static __inline__ void dscc4_tx_irq(struct dscc4_pci_priv *ppriv,
- struct net_device *dev)
- {
- struct dscc4_dev_priv *dpriv = dev->priv;
- u32 state;
- int cur, loop = 0;
- try:
- cur = dpriv->iqtx_current%IRQ_RING_SIZE;
- state = dpriv->iqtx[cur];
- if (!state) {
- #ifdef DEBUG
- if (loop > 1)
- printk(KERN_DEBUG "%s: Tx irq loop=%dn", dev->name, loop);
- #endif
- if (loop && netif_queue_stopped(dev))
- if ((dpriv->tx_dirty + 8) >= dpriv->tx_current)
- netif_wake_queue(dev);
- return;
- }
- loop++;
- dpriv->iqtx[cur] = 0;
- dpriv->iqtx_current++;
- #ifdef DEBUG_PARANOID
- if (SOURCE_ID(state) != dpriv->dev_id) {
- printk(KERN_DEBUG "%s (Tx): Source Id=%d, state=%08xn",
- dev->name, SOURCE_ID(state), state );
- return;
- }
- if (state & 0x0df80c00) {
- printk(KERN_DEBUG "%s (Tx): state=%08x (UFO alert)n",
- dev->name, state);
- return;
- }
- #endif
- // state &= 0x0fffffff; /* Tracking the analyzed bits */
- if (state & SccEvt) {
- if (state & Alls) {
- struct TxFD *tx_fd;
- struct sk_buff *skb;
- cur = dpriv->tx_dirty%TX_RING_SIZE;
- tx_fd = dpriv->tx_fd + cur;
- skb = dpriv->tx_skbuff[cur];
- /* XXX: hideous kludge - to be removed "later" */
- if (!skb) {
- printk(KERN_ERR "%s: NULL skb in tx_irq at index %dn", dev->name, cur);
- goto try;
- }
- dpriv->tx_dirty++; // MUST be after skb test
- /* Happens sometime. Don't know what triggers it */
- if (!(tx_fd->complete & DataComplete)) {
- u32 ioaddr, isr;
- ioaddr = dev->base_addr +
- SCC_REG_START(dpriv->dev_id) + ISR;
- isr = readl(ioaddr);
- printk(KERN_DEBUG
- "%s: DataComplete=0 cur=%d isr=%08x state=%08xn",
- dev->name, cur, isr, state);
- writel(isr, ioaddr);
- dpriv->stats.tx_dropped++;
- } else {
- tx_fd->complete &= ~DataComplete;
- if (tx_fd->state & FrameEnd) {
- dpriv->stats.tx_packets++;
- dpriv->stats.tx_bytes += skb->len;
- }
- }
- dpriv->tx_skbuff[cur] = NULL;
- pci_unmap_single(ppriv->pdev, tx_fd->data, skb->len,
- PCI_DMA_TODEVICE);
- tx_fd->data = 0; /* DEBUG */
- dev_kfree_skb_irq(skb);
- { // DEBUG
- cur = (dpriv->tx_dirty-1)%TX_RING_SIZE;
- tx_fd = dpriv->tx_fd + cur;
- tx_fd->state |= Hold;
- }
- if (!(state &= ~Alls))
- goto try;
- }
- /*
- * Transmit Data Underrun
- */
- if (state & Xdu) {
- printk(KERN_ERR "dscc4: XDU. Contact maintainern");
- dpriv->flags = NeedIDT;
- /* Tx reset */
- writel(MTFi | Rdt,
- dev->base_addr + 0x0c*dpriv->dev_id + CH0CFG);
- writel(0x00000001, dev->base_addr + GCMDR);
- return;
- }
- if (state & Xmr) {
- /* Frame needs to be sent again - FIXME */
- //dscc4_start_xmit(dpriv->tx_skbuff[dpriv->tx_dirty], dev);
- if (!(state &= ~0x00002000)) /* DEBUG */
- goto try;
- }
- if (state & Xpr) {
- unsigned long ioaddr = dev->base_addr;
- unsigned long scc_offset;
- u32 scc_addr;
- scc_offset = ioaddr + SCC_REG_START(dpriv->dev_id);
- scc_addr = ioaddr + 0x0c*dpriv->dev_id;
- if (readl(scc_offset + STAR) & SccBusy)
- printk(KERN_DEBUG "%s busy. Fataln",
- dev->name);
- /*
- * Keep this order: IDT before IDR
- */
- if (dpriv->flags & NeedIDT) {
- writel(MTFi | Idt, scc_addr + CH0CFG);
- writel(dpriv->tx_fd_dma +
- (dpriv->tx_dirty%TX_RING_SIZE)*
- sizeof(struct TxFD), scc_addr + CH0BTDA);
- if(dscc4_do_action(dev, "IDT"))
- goto err_xpr;
- dpriv->flags &= ~NeedIDT;
- mb();
- }
- if (dpriv->flags & NeedIDR) {
- writel(MTFi | Idr, scc_addr + CH0CFG);
- writel(dpriv->rx_fd_dma +
- (dpriv->rx_current%RX_RING_SIZE)*
- sizeof(struct RxFD), scc_addr + CH0BRDA);
- if(dscc4_do_action(dev, "IDR"))
- goto err_xpr;
- dpriv->flags &= ~NeedIDR;
- mb();
- /* Activate receiver and misc */
- writel(0x08050008, scc_offset + CCR2);
- }
- err_xpr:
- if (!(state &= ~Xpr))
- goto try;
- }
- } else { /* ! SccEvt */
- if (state & Hi) {
- #ifdef EXPERIMENTAL_POLLING
- while(!dscc4_tx_poll(dpriv, dev));
- #endif
- state &= ~Hi;
- }
- /*
- * FIXME: it may be avoided. Re-re-re-read the manual.
- */
- if (state & Err) {
- printk(KERN_ERR "%s: Tx ERRn", dev->name);
- dpriv->stats.tx_errors++;
- state &= ~Err;
- }
- }
- goto try;
- }
- static __inline__ void dscc4_rx_irq(struct dscc4_pci_priv *priv, struct net_device *dev)
- {
- struct dscc4_dev_priv *dpriv = dev->priv;
- u32 state;
- int cur;
- try:
- cur = dpriv->iqrx_current%IRQ_RING_SIZE;
- state = dpriv->iqrx[cur];
- if (!state)
- return;
- dpriv->iqrx[cur] = 0;
- dpriv->iqrx_current++;
- #ifdef DEBUG_PARANOID
- if (SOURCE_ID(state) != dpriv->dev_id) {
- printk(KERN_DEBUG "%s (Rx): Source Id=%d, state=%08xn",
- dev->name, SOURCE_ID(state), state);
- goto try;
- }
- if (state & 0x0df80c00) {
- printk(KERN_DEBUG "%s (Rx): state=%08x (UFO alert)n",
- dev->name, state);
- goto try;
- }
- #endif
- if (!(state & SccEvt)){
- struct RxFD *rx_fd;
- state &= 0x00ffffff;
- if (state & Err) { /* Hold or reset */
- printk(KERN_DEBUG "%s (Rx): ERRn", dev->name);
- cur = dpriv->rx_current;
- rx_fd = dpriv->rx_fd + cur;
- /*
- * Presume we're not facing a DMAC receiver reset.
- * As We use the rx size-filtering feature of the
- * DSCC4, the beginning of a new frame is waiting in
- * the rx fifo. I bet a Receive Data Overflow will
- * happen most of time but let's try and avoid it.
- * Btw (as for RDO) if one experiences ERR whereas
- * the system looks rather idle, there may be a
- * problem with latency. In this case, increasing
- * RX_RING_SIZE may help.
- */
- while (dpriv->rx_needs_refill) {
- while(!(rx_fd->state1 & Hold)) {
- rx_fd++;
- cur++;
- if (!(cur = cur%RX_RING_SIZE))
- rx_fd = dpriv->rx_fd;
- }
- dpriv->rx_needs_refill--;
- try_get_rx_skb(dpriv, cur, dev);
- if (!rx_fd->data)
- goto try;
- rx_fd->state1 &= ~Hold;
- rx_fd->state2 = 0x00000000;
- rx_fd->end = 0xbabeface;
- }
- goto try;
- }
- if (state & Fi) {
- cur = dpriv->rx_current%RX_RING_SIZE;
- rx_fd = dpriv->rx_fd + cur;
- dscc4_rx_skb(dpriv, cur, rx_fd, dev);
- dpriv->rx_current++;
- goto try;
- }
- if (state & Hi ) { /* HI bit */
- state &= ~Hi;
- goto try;
- }
- } else { /* ! SccEvt */
- #ifdef DEBUG_PARANOIA
- int i;
- static struct {
- u32 mask;
- const char *irq_name;
- } evts[] = {
- { 0x00008000, "TIN"},
- { 0x00004000, "CSC"},
- { 0x00000020, "RSC"},
- { 0x00000010, "PCE"},
- { 0x00000008, "PLLA"},
- { 0x00000004, "CDSC"},
- { 0, NULL}
- };
- #endif /* DEBUG_PARANOIA */
- state &= 0x00ffffff;
- #ifdef DEBUG_PARANOIA
- for (i = 0; evts[i].irq_name; i++) {
- if (state & evts[i].mask) {
- printk(KERN_DEBUG "dscc4(%s): %sn",
- dev->name, evts[i].irq_name);
- if (!(state &= ~evts[i].mask))
- goto try;
- }
- }
- #endif /* DEBUG_PARANOIA */
- /*
- * Receive Data Overflow (FIXME: untested)
- */
- if (state & Rdo) {
- u32 ioaddr, scc_offset, scc_addr;
- struct RxFD *rx_fd;
- int cur;
- //if (debug)
- // dscc4_rx_dump(dpriv);
- ioaddr = dev->base_addr;
- scc_addr = ioaddr + 0x0c*dpriv->dev_id;
- scc_offset = ioaddr + SCC_REG_START(dpriv->dev_id);
- writel(readl(scc_offset + CCR2) & ~RxActivate,
- scc_offset + CCR2);
- /*
- * This has no effect. Why ?
- * ORed with TxSccRes, one sees the CFG ack (for
- * the TX part only).
- */
- writel(RxSccRes, scc_offset + CMDR);
- dpriv->flags |= RdoSet;
- /*
- * Let's try and save something in the received data.
- * rx_current must be incremented at least once to
- * avoid HOLD in the BRDA-to-be-pointed desc.
- */
- do {
- cur = dpriv->rx_current++%RX_RING_SIZE;
- rx_fd = dpriv->rx_fd + cur;
- if (!(rx_fd->state2 & DataComplete))
- break;
- if (rx_fd->state2 & FrameAborted) {
- dpriv->stats.rx_over_errors++;
- rx_fd->state1 |= Hold;
- rx_fd->state2 = 0x00000000;
- rx_fd->end = 0xbabeface;
- } else
- dscc4_rx_skb(dpriv, cur, rx_fd, dev);
- } while (1);
- if (debug) {
- if (dpriv->flags & RdoSet)
- printk(KERN_DEBUG
- "dscc4: no RDO in Rx datan");
- }
- #ifdef DSCC4_RDO_EXPERIMENTAL_RECOVERY
- /*
- * FIXME: must the reset be this violent ?
- */
- writel(dpriv->rx_fd_dma +
- (dpriv->rx_current%RX_RING_SIZE)*
- sizeof(struct RxFD), scc_addr + CH0BRDA);
- writel(MTFi|Rdr|Idr, scc_addr + CH0CFG);
- if(dscc4_do_action(dev, "RDR")) {
- printk(KERN_ERR "%s: RDO recovery failed(%s)n",
- dev->name, "RDR");
- goto rdo_end;
- }
- writel(MTFi|Idr, scc_addr + CH0CFG);
- if(dscc4_do_action(dev, "IDR")) {
- printk(KERN_ERR "%s: RDO recovery failed(%s)n",
- dev->name, "IDR");
- goto rdo_end;
- }
- rdo_end:
- #endif
- writel(readl(scc_offset + CCR2) | RxActivate,
- scc_offset + CCR2);
- goto try;
- }
- /* These will be used later */
- if (state & Rfs) {
- if (!(state &= ~Rfs))
- goto try;
- }
- if (state & Rfo) {
- if (!(state &= ~Rfo))
- goto try;
- }
- if (state & Flex) {
- if (!(state &= ~Flex))
- goto try;
- }
- }
- }
- static int dscc4_init_ring(struct net_device *dev)
- {
- struct dscc4_dev_priv *dpriv = (struct dscc4_dev_priv *)dev->priv;
- struct TxFD *tx_fd;
- struct RxFD *rx_fd;
- int i;
- tx_fd = (struct TxFD *) pci_alloc_consistent(dpriv->pci_priv->pdev,
- TX_RING_SIZE*sizeof(struct TxFD), &dpriv->tx_fd_dma);
- if (!tx_fd)
- goto err_out;
- rx_fd = (struct RxFD *) pci_alloc_consistent(dpriv->pci_priv->pdev,
- RX_RING_SIZE*sizeof(struct RxFD), &dpriv->rx_fd_dma);
- if (!rx_fd)
- goto err_free_dma_tx;
- dpriv->tx_fd = tx_fd;
- dpriv->rx_fd = rx_fd;
- dpriv->rx_current = 0;
- dpriv->tx_current = 0;
- dpriv->tx_dirty = 0;
- /* the dma core of the dscc4 will be locked on the first desc */
- for(i = 0; i < TX_RING_SIZE; ) {
- reset_TxFD(tx_fd);
- /* FIXME: NULL should be ok - to be tried */
- tx_fd->data = dpriv->tx_fd_dma;
- dpriv->tx_skbuff[i] = NULL;
- i++;
- tx_fd->next = (u32)(dpriv->tx_fd_dma + i*sizeof(struct TxFD));
- tx_fd++;
- }
- (--tx_fd)->next = (u32)dpriv->tx_fd_dma;
- {
- /*
- * XXX: I would expect the following to work for the first descriptor
- * (tx_fd->state = 0xc0000000)
- * - Hold=1 (don't try and branch to the next descripto);
- * - No=0 (I want an empty data section, i.e. size=0);
- * - Fe=1 (required by No=0 or we got an Err irq and must reset).
- * Alas, it fails (and locks solid). Thus the introduction of a dummy
- * skb to avoid No=0 (choose one: Ugly [ ] Tasteless [ ] VMS [ ]).
- * TODO: fiddle the tx threshold when time permits.
- */
- struct sk_buff *skb;
- skb = dev_alloc_skb(32);
- if (!skb)
- goto err_free_dma_tx;
- skb->len = 32;
- memset(skb->data, 0xaa, 16);
- tx_fd -= (TX_RING_SIZE - 1);
- tx_fd->state = 0xc0000000;
- tx_fd->state |= ((u32)(skb->len & TxSizeMax)) << 16;
- tx_fd->data = pci_map_single(dpriv->pci_priv->pdev, skb->data,
- skb->len, PCI_DMA_TODEVICE);
- dpriv->tx_skbuff[0] = skb;
- }
- for (i = 0; i < RX_RING_SIZE;) {
- /* size set by the host. Multiple of 4 bytes please */
- rx_fd->state1 = HiDesc; /* Hi, no Hold */
- rx_fd->state2 = 0x00000000;
- rx_fd->end = 0xbabeface;
- rx_fd->state1 |= ((u32)(HDLC_MAX_MRU & RxSizeMax)) << 16;
- try_get_rx_skb(dpriv, i, dev);
- i++;
- rx_fd->next = (u32)(dpriv->rx_fd_dma + i*sizeof(struct RxFD));
- rx_fd++;
- }
- (--rx_fd)->next = (u32)dpriv->rx_fd_dma;
- rx_fd->state1 |= 0x40000000; /* Hold */
- return 0;
- err_free_dma_tx:
- pci_free_consistent(dpriv->pci_priv->pdev, TX_RING_SIZE*sizeof(*tx_fd),
- tx_fd, dpriv->tx_fd_dma);
- err_out:
- return -1;
- }
- static struct net_device_stats *dscc4_get_stats(struct net_device *dev)
- {
- struct dscc4_dev_priv *priv = (struct dscc4_dev_priv *)dev->priv;
- return &priv->stats;
- }
- static void __exit dscc4_remove_one(struct pci_dev *pdev)
- {
- struct dscc4_pci_priv *ppriv;
- struct net_device *root;
- int i;
- ppriv = pci_get_drvdata(pdev);
- root = ppriv->root;
- free_irq(pdev->irq, root);
- pci_free_consistent(pdev, IRQ_RING_SIZE*sizeof(u32), ppriv->iqcfg,
- ppriv->iqcfg_dma);
- for (i=0; i < dev_per_card; i++) {
- struct dscc4_dev_priv *dpriv;
- struct net_device *dev;
- dev = ppriv->root + i;
- dscc4_unattach_hdlc_device(dev);
- dpriv = (struct dscc4_dev_priv *)dev->priv;
- pci_free_consistent(pdev, IRQ_RING_SIZE*sizeof(u32),
- dpriv->iqrx, dpriv->iqrx_dma);
- pci_free_consistent(pdev, IRQ_RING_SIZE*sizeof(u32),
- dpriv->iqtx, dpriv->iqtx_dma);
- unregister_netdev(dev);
- }
- kfree(root->priv);
- iounmap((void *)root->base_addr);
- kfree(root);
- kfree(ppriv);
- release_mem_region(pci_resource_start(pdev, 1),
- pci_resource_len(pdev, 1));
- release_mem_region(pci_resource_start(pdev, 0),
- pci_resource_len(pdev, 0));
- }
- static int dscc4_hdlc_ioctl(struct hdlc_device_struct *hdlc, struct ifreq *ifr, int cmd)
- {
- struct net_device *dev = (struct net_device *)hdlc->netdev.base_addr;
- int result;
- /* FIXME: locking ? */
- result = dscc4_ioctl(dev, ifr, cmd);
- return result;
- }
- static int dscc4_hdlc_open(struct hdlc_device_struct *hdlc)
- {
- struct net_device *dev = (struct net_device *)(hdlc->netdev.base_addr);
- if (netif_running(dev)) {
- printk(KERN_DEBUG "%s: already runningn", dev->name); // DEBUG
- return 0;
- }
- return dscc4_open(dev);
- }
- static int dscc4_hdlc_xmit(hdlc_device *hdlc, struct sk_buff *skb)
- {
- struct net_device *dev = (struct net_device *)hdlc->netdev.base_addr;
- return dscc4_start_xmit(skb, dev);
- }
- static void dscc4_hdlc_close(struct hdlc_device_struct *hdlc)
- {
- struct net_device *dev = (struct net_device *)hdlc->netdev.base_addr;
- struct dscc4_dev_priv *dpriv;
- dpriv = dev->priv;
- --dpriv->usecount;
- }
- /* Operated under dev lock */
- static int dscc4_attach_hdlc_device(struct net_device *dev)
- {
- struct dscc4_dev_priv *dpriv = dev->priv;
- struct hdlc_device_struct *hdlc;
- int result;
- hdlc = &dpriv->hdlc;
- /* XXX: Don't look at the next line */
- hdlc->netdev.base_addr = (unsigned long)dev;
- hdlc->set_mode = NULL;
- hdlc->open = dscc4_hdlc_open;
- hdlc->close = dscc4_hdlc_close;
- hdlc->ioctl = dscc4_hdlc_ioctl;
- hdlc->xmit = dscc4_hdlc_xmit;
- result = register_hdlc_device(hdlc);
- if (!result)
- dpriv->usecount++;
- return result;
- }
- /* Operated under dev lock */
- static void dscc4_unattach_hdlc_device(struct net_device *dev)
- {
- struct dscc4_dev_priv *dpriv = dev->priv;
- unregister_hdlc_device(&dpriv->hdlc);
- dpriv->usecount--;
- }
- static struct pci_device_id dscc4_pci_tbl[] __devinitdata = {
- { PCI_VENDOR_ID_SIEMENS, PCI_DEVICE_ID_SIEMENS_DSCC4,
- PCI_ANY_ID, PCI_ANY_ID, },
- { 0,}
- };
- MODULE_DEVICE_TABLE(pci, dscc4_pci_tbl);
- static struct pci_driver dscc4_driver = {
- name: "dscc4",
- id_table: dscc4_pci_tbl,
- probe: dscc4_init_one,
- remove: dscc4_remove_one,
- };
- static int __init dscc4_init_module(void)
- {
- return pci_module_init(&dscc4_driver);
- }
- static void __exit dscc4_cleanup_module(void)
- {
- pci_unregister_driver(&dscc4_driver);
- }
- module_init(dscc4_init_module);
- module_exit(dscc4_cleanup_module);