Logo Search packages:      
Sourcecode: affix-kernel version File versions

bt950uart_cs.c

/*
 *
 *  Driver for bluetooth CF cards with OXCF950 UART such as BT2000E from Ambicom/Pretec
 *
 *  Copyright (C) 2002  Albert Rybalkin <albertr@iral.com>
 *
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation;
 *
 *  Software distributed under the License is distributed on an "AS
 *  IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 *  implied. See the License for the specific language governing
 *  rights and limitations under the License.
 *
 * Portions based on the original code of pcmcia-cs by David A. Hinds,
 * Copyright (C) 1999 David A. Hinds.  All Rights Reserved.
 *
 * Portions based on the original code of btuart_cs.c by Marcel Holtmann,
 * Copyright (C) 2001-2002  Marcel Holtmann <marcel@holtmann.org>. 
 *
 */

#include <linux/config.h>

#ifdef CONFIG_MODVERSIONS
#ifndef MODVERSIONS
#define MODVERSIONS
#endif
#include <linux/version.h>
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
#include <linux/modversions.h>
#else
#include <config/modversions.h>
#endif
#endif

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/errno.h>
#include <linux/ptrace.h>
#include <linux/ioport.h>
#include <linux/spinlock.h>
#include <linux/delay.h>

#include <linux/skbuff.h>
#include <linux/string.h>
#include <linux/serial.h>
#include <linux/serial_reg.h>
#include <asm/system.h>
#include <asm/bitops.h>
#include <asm/io.h>

#include <pcmcia/version.h>
#include <pcmcia/cs_types.h>
#include <pcmcia/cs.h>
#include <pcmcia/cistpl.h>
#include <pcmcia/ciscode.h>
#include <pcmcia/ds.h>
#include <pcmcia/cisreg.h>

#include <affix/bluez.h>

/* ======================== Module parameters ======================== */

#define DRIVER_VERSION  "0.22"
#define DRIVER_NAME     "OXCF950-based bluetooth cards driver"

/* Bit map of interrupts to choose from */
static u_int irq_mask = 0x86bc;
static int irq_list[4] = { -1 };

MODULE_PARM(irq_mask, "i");
MODULE_PARM(irq_list, "1-4i");

MODULE_AUTHOR("Albert Rybalkin <albertr@iral.com>");
MODULE_DESCRIPTION(DRIVER_NAME " ver." DRIVER_VERSION);
#ifdef MODULE_LICENSE
MODULE_LICENSE("GPL");
#endif

/* ======================== Local structures ======================== */


typedef struct btuart_info_t {
    dev_link_t link;
    dev_node_t node;

    struct hci_dev hdev;

    spinlock_t lock;           /* For serializing operations */

    struct sk_buff_head txq;

    unsigned long rx_state;
    unsigned long tx_state;
    unsigned long rx_count;
    
    struct sk_buff *rx_skb;
} btuart_info_t;


static dev_info_t dev_info = "bt950uart_cs";
static dev_link_t *dev_list = NULL;

static void btuart_config(dev_link_t *link);
static void btuart_release(u_long arg);
static int btuart_event(event_t event, int priority, event_callback_args_t *args);
static dev_link_t *btuart_attach(void);
static void btuart_detach(dev_link_t *);

#if LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0)
static struct pcmcia_driver btuart_driver = {
      .drv        = {
            .name = "bt950uart_cs",
      },
      .attach           = btuart_attach,
      .detach           = btuart_detach,
      .owner            = THIS_MODULE,
};
#endif


/* Receiver states */
#define RECV_WAIT_PACKET_TYPE   0
#define RECV_WAIT_EVENT_HEADER  1
#define RECV_WAIT_ACL_HEADER    2
#define RECV_WAIT_SCO_HEADER    3
#define RECV_WAIT_DATA          4

/* Transmitter states */
#define XMIT_SENDING          1

/* 950-specific stuff */
#define MAX_WAIT  0xFFFF
#define FIFO_SIZE 128

#define TR_TX_INT       0x10  /* TTL: TX interrupt trigger level (0-127) */
#define TR_RX_INT       0x40  /* RTL: RX interrupt trigger level (1-127) */
#define TR_CTL_LO       0x08  /* FCL: auto flow control LOWER trigger level (0-127) */
#define TR_CTL_HI       0x60  /* FCH: auto flow control HIGH trigger level (1-127) */

/* 950-specific registers and values we use. It should eventually go to
 *
 *  include/linux/serial_reg.h
 *
 */
#define UART_IER_CTS    0x80 /* enable CTS interrupt */
#define UART_IER_RTS    0x40 /* enable RTS interrupt */
#define UART_IER_SLP    0x10 /* enable sleep mode */
#define UART_LCR_650    0xBF /* enable 650-compatible registers access */
#define UART_LSR_DE     0x80 /* data error */
#define UART_LSR_ERR    (UART_LSR_OE|UART_LSR_PE|UART_LSR_FE|UART_LSR_BI|UART_LSR_DE)
#define UART_IIR_RXTOUT 0x0C /* RX timeout interrupt */
#define UART_IIR_CTSRTS 0x20 /* CTS or RTS change interrupt */
#define UART_IIR_RTS    0x40
#define UART_IIR_CTS    0x80
#define UART_IIR_MASK   0x3E /* interrupt mask */
#define UART_SRT  0x0D /* soft reset register */


/* ======================== Interrupt handling ======================== */

static void btuart_write(btuart_info_t *info, int fromint) {

    unsigned int iobase = info->link.io.BasePort1;
    register int i, chunk;
    struct sk_buff *skb;
    int total;

    if (!info) {
      printk(KERN_ERR "bt950uart_cs: unknown device\n");
      return;
    }

    /* activate DTR and RTS */
    outb(UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2, iobase + UART_MCR);

    /* wait for CTS */
    for (i = MAX_WAIT; i; i--)
      if (inb(iobase + UART_MSR) & UART_MSR_CTS) break;

    if (!i) {
      printk(KERN_WARNING "bt950uart_cs: timeout waiting for CTS\n");
      clear_bit(XMIT_SENDING, &(info->tx_state));
      return;
    }
    
    skb = skb_dequeue(&(info->txq));
    
    if (skb) {  

      if (fromint) {

          chunk = FIFO_SIZE - TR_TX_INT; 

      } else {

          chunk = FIFO_SIZE; 

          /* TX FIFO should be empty */
          for (i = MAX_WAIT; i; i--)
            if (inb(iobase + UART_LSR) & UART_LSR_THRE) break;

          if (!i) {
            printk(KERN_WARNING "bt950uart_cs: timeout waiting for empty TX FIFO\n");
            /* drop skb on the floor */
            dev_kfree_skb_any(skb);
            clear_bit(XMIT_SENDING, &(info->tx_state));
            return;
          }

      }

      total = skb->len;

      if (skb->len < chunk) {
      
          chunk = skb->len;
          
          /* fill up TX FIFO */
          for (i = 0; i < chunk; i++) {
            outb(skb->data[i], iobase + UART_TX);
          }
          
          dev_kfree_skb_any(skb);
          clear_bit(XMIT_SENDING, &(info->tx_state));
      
      } else {
      
          /* fill up TX FIFO */
          for (i = 0; i < chunk; i++) {
            outb(skb->data[i], iobase + UART_TX);
          }
          
          skb_pull(skb, chunk);
          skb_queue_head(&(info->txq), skb);
          set_bit(XMIT_SENDING, &(info->tx_state));
      }

      info->hdev.stat.byte_tx += chunk;

#if defined(OX950_DEBUG)
      if (fromint)
          printk(KERN_WARNING "bt950uart_cs: wrote=<%d out of %d> from int\n", chunk, total);
      else
          printk(KERN_WARNING "bt950uart_cs: wrote=<%d out of %d>\n", chunk, total);
#endif

    }

}


static inline void btuart_read(btuart_info_t *info) {

    unsigned int iobase;
    int dlen;
    hci_event_hdr *eh;
    hci_acl_hdr   *ah;
    hci_sco_hdr   *sh;
    unsigned long size = 0;

    if (!info) {
      printk(KERN_ERR "bt950uart_cs: receive: unknown device\n");
      return;
    }

    iobase = info->link.io.BasePort1;

start_over:

    /* Allocate packet */
    if (!(info->rx_skb) && !(info->rx_skb = bluez_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC))) {
        printk(KERN_ERR "bt950uart_cs: receive: can't allocate mem for new packet\n");
      info->rx_skb = NULL;
       return;
    }

    if (info->rx_state == RECV_WAIT_PACKET_TYPE) {

        /* BUG-BUG */
      inb(iobase + UART_MCR);

      /* get first byte */
      info->rx_skb->pkt_type = inb(iobase + UART_RX);
      info->rx_skb->dev = (void *)&(info->hdev);
      info->hdev.stat.byte_rx++;

      switch (info->rx_skb->pkt_type) {

          case HCI_EVENT_PKT:
            info->rx_state = RECV_WAIT_EVENT_HEADER;
            info->rx_count = HCI_EVENT_HDR_SIZE;
            break;

          case HCI_ACLDATA_PKT:
            info->rx_state = RECV_WAIT_ACL_HEADER;
            info->rx_count = HCI_ACL_HDR_SIZE;
            break;

          case HCI_SCODATA_PKT:
            info->rx_state = RECV_WAIT_SCO_HEADER;
            info->rx_count = HCI_SCO_HDR_SIZE;
            break;

          default:
            /* bogus packet */
            /* read the rest of the packet and discard it */
            size = 1;
            info->hdev.stat.err_rx++;
            while (inb(iobase + UART_LSR) & UART_LSR_DR) {
                inb(iobase + UART_RX);
                size++;
            }
            printk(KERN_WARNING "bt950uart_cs: receive: received bogus packet: type=0x%02X size=%ld\n", info->rx_skb->pkt_type, size);
            dev_kfree_skb_any(info->rx_skb);
            info->rx_skb = NULL;
            return;
            break;
      }
    
    }

get_more:

    if (info->rx_count > skb_tailroom(info->rx_skb)) {
      printk(KERN_ERR "bt950uart_cs: receive: packet is too large\n");
      info->hdev.stat.err_rx++;
      dev_kfree_skb_any(info->rx_skb);
      info->rx_skb = NULL;
      return;
    }

    if (!(info->rx_count)) {
      printk(KERN_ERR "bt950uart_cs: receive: zero packet size\n");
      info->hdev.stat.err_rx++;
      dev_kfree_skb_any(info->rx_skb);
      info->rx_skb = NULL;
      return;
    }

    size = info->rx_count;

    while ((info->rx_count) && (inb(iobase + UART_LSR) & UART_LSR_DR)) {

      /* get the next byte */
      *skb_put(info->rx_skb, 1) = inb(iobase + UART_RX);
      info->hdev.stat.byte_rx++;
      info->rx_count--;
    }


#if defined(OX950_DEBUG)
    if (!(info->rx_count))
      printk(KERN_NOTICE "bt950uart_cs: receive: received type=0x%X state=%ld size=%ld\n", info->rx_skb->pkt_type, info->rx_state, size); 
    else
      printk(KERN_NOTICE "bt950uart_cs: receive: received incomplete type=0x%X state=%ld size=%ld\n", info->rx_skb->pkt_type, info->rx_state, size); 
#endif

    if (!(info->rx_count)) {
        switch (info->rx_state) {

          case RECV_WAIT_EVENT_HEADER:
              eh = (hci_event_hdr *)(info->rx_skb->data);
            info->rx_state = RECV_WAIT_DATA;
            info->rx_count = eh->plen;
            goto get_more;
            break;

          case RECV_WAIT_ACL_HEADER:
            ah = (hci_acl_hdr *)(info->rx_skb->data);
            dlen = __le16_to_cpu(ah->dlen);
            info->rx_state = RECV_WAIT_DATA;
            info->rx_count = dlen;
            goto get_more;
            break;

          case RECV_WAIT_SCO_HEADER:
            sh = (hci_sco_hdr *)(info->rx_skb->data);
            info->rx_state = RECV_WAIT_DATA;
            info->rx_count = sh->dlen;
            goto get_more;
            break;

          case RECV_WAIT_DATA:
            hci_recv_frame(info->rx_skb);
            info->rx_state = RECV_WAIT_PACKET_TYPE;
            info->rx_skb = NULL;
            if (inb(iobase + UART_LSR) & UART_LSR_DR)
                /* we can save an interrupt here */
                goto start_over;
            break;
      }
    }
}


static void btuart_interrupt(int irq, void *dev_inst, struct pt_regs *regs) {

    btuart_info_t *info = dev_inst;
    unsigned int iobase;
    unsigned char lsr;
    register unsigned char iir;

    if (!info) {
      printk(KERN_ERR "bt950uart_cs: interrupt: unknown device for irq %d\n", irq);
      return;
    }

    iobase = info->link.io.BasePort1;

    spin_lock(&(info->lock));

    iir = inb(iobase + UART_IIR);
  
    while (!(iir & UART_IIR_NO_INT)) {

        switch (iir & UART_IIR_ID) {

          case UART_IIR_RDI:
            /* RX interrupt */
            btuart_read(info);
            break;
          case UART_IIR_THRI:
              /* TX interrupt */
            btuart_write(info, 1);
            break;
          case UART_IIR_RLSI:
            /* clear RLSI int */
            lsr = inb(iobase + UART_LSR); 
            printk(KERN_NOTICE "bt950uart_cs: interrupt: unhandled RLSI, LSR=0x%X\n", lsr);
            /* BUG-BUG we need to process error... */
            break;
          default:
            printk(KERN_NOTICE "bt950uart_cs: interrupt: unhandled IIR=0x%X\n", iir);
            break;
      }
      
      iir = inb(iobase + UART_IIR);
    }

    spin_unlock(&(info->lock));

}


/* ======================== HCI interface ======================== */


static int btuart_hci_flush(struct hci_dev *hdev) {

    btuart_info_t *info = (btuart_info_t *)(hdev->driver_data);

    /* Drop TX queue */
    skb_queue_purge(&(info->txq));

    return 0;

}


static int btuart_hci_open(struct hci_dev *hdev) {

    set_bit(HCI_RUNNING, &(hdev->flags));
  
    return 0;

}


static int btuart_hci_close(struct hci_dev *hdev) {

    if (!test_and_clear_bit(HCI_RUNNING, &(hdev->flags)))
      return 0;

    btuart_hci_flush(hdev);

    return 0;

}


static int btuart_hci_send_frame(struct sk_buff *skb) {

    unsigned long flags;
    btuart_info_t *info;
    struct hci_dev* hdev = (struct hci_dev *)(skb->dev);

    if (!hdev) {
      printk(KERN_ERR "bt950uart_cs: hci_send_frame: unknown HCI device\n");
      return -ENODEV;
    }

    info = (btuart_info_t *)(hdev->driver_data);

    switch (skb->pkt_type) {

      case HCI_COMMAND_PKT:

          hdev->stat.cmd_tx++;
          break;

      case HCI_ACLDATA_PKT:
          
          hdev->stat.acl_tx++;
          break;

      case HCI_SCODATA_PKT:
    
          hdev->stat.sco_tx++;
          break;
    };

    /* Prepend skb with frame type */
    memcpy(skb_push(skb, 1), &(skb->pkt_type), 1);
    skb_queue_tail(&(info->txq), skb);

    /* send it right away if transmitter is idle */
    if (!test_bit(XMIT_SENDING, &(info->tx_state))) {

      spin_lock_irqsave(&(info->lock), flags);

      btuart_write(info, 0);

      spin_unlock_irqrestore(&(info->lock), flags);

    }
    
    return 0;

}


static void btuart_hci_destruct(struct hci_dev *hdev) {

    /* nothing to do */
  
}


static int btuart_hci_ioctl(struct hci_dev *hdev, unsigned int cmd, unsigned long arg) {

    /* we don't provide any ioctl's */
    return -ENOIOCTLCMD;

}


/* ======================== Card services HCI interaction ======================== */


static int setup_uart(btuart_info_t *info) {

    unsigned long flags;
    unsigned int iobase = info->link.io.BasePort1;
    unsigned char lcr, ier = UART_IER_THRI | UART_IER_RDI | UART_IER_RLSI | UART_IER_SLP;
    unsigned int divisor = 8; /* divisor == 0x0C ??? */
    unsigned char id1, id2, id3, rev;
    register int i;

    spin_lock_irqsave(&(info->lock), flags);
    
    /* disable interrupts */
    outb(0, iobase + UART_IER); 

    /* activate RTS and OUT2 */
    /* BUG-BUG: is OUT2 used to enable interrupts? */
    outb(UART_MCR_RTS | UART_MCR_OUT2, iobase + UART_MCR);

    /* setup FIFOs */
    outb(0, iobase + UART_FCR);
    inb(iobase + UART_RX);
    outb(UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT | UART_FCR_TRIGGER_14, iobase + UART_FCR);
    
    /* disable divisor latch access */
    lcr = inb(iobase + UART_LCR) & 0x3F; /* mask out UART_LCR_DLAB and UART_LCR_SBC */
    outb(lcr, iobase + UART_LCR);
    
    /* read upto 4 bytes from RX FIFO */
    for(i = 1; i < 5; i++) {
        inb(iobase + UART_RX);
        if (!(inb(iobase + UART_LSR) & UART_LSR_DR)) break;
    }

    /* wait if CTS/DSR/DCD changing */
    for (i = 1; i < 0x3E8; i++) {
        if (!(inb(iobase + UART_MSR) & UART_MSR_ANY_DELTA)) break;
    }
    
    /* enable divisor latch access */
    outb(lcr | UART_LCR_DLAB, iobase + UART_LCR);

    /* setup divisor latch */
    outb(divisor & 0x00FF, iobase + UART_DLL); /* divisor latch LOW byte */
    outb((divisor & 0xFF00) >> 8, iobase + UART_DLM); /* divisor latch HIGH byte */

    /* disable divisor latch access */
    outb(lcr, iobase + UART_LCR);

    /* setup interrupts, enable sleep mode */
    outb(ier, iobase + UART_IER); /* we don't want to handle TX interrupts */

    /* skip pending interrupts */
    for (i = 1; i < 5; i++) {
        if (inb(iobase + UART_IIR) & UART_IIR_NO_INT) break;
    }

    /* 8N1 */
    lcr = UART_LCR_WLEN8;
    outb(lcr, iobase + UART_LCR); 

    /* setup CTS/RTS flow control and 950 enhanced mode */
    outb(UART_LCR_650, iobase + UART_LCR);
    outb(UART_EFR_CTS | UART_EFR_RTS | UART_EFR_ECB, iobase + UART_EFR);
    outb(lcr, iobase + UART_LCR);

    /* read core id and revision */
    outb(UART_ACR, iobase + UART_EMSR);
    outb(UART_ACR_ICRRD, iobase + UART_LSR); /* enable ICR read access, we don't need to save the old value of ACR */

    outb(UART_ID1, iobase + UART_EMSR);
    id1 = inb(iobase + UART_LSR);

    outb(UART_ID2, iobase + UART_EMSR);
    id2 = inb(iobase + UART_LSR);

    outb(UART_ID3, iobase + UART_EMSR);
    id3 = inb(iobase + UART_LSR);

    outb(UART_REV, iobase + UART_EMSR);
    rev = inb(iobase + UART_LSR);

    if (id1 != 0x16 || id2 != 0xC9 || id3 != 0x50) {
        printk(KERN_ERR "bt950uart_cs: unknown UART core found: 0x%02x%02x%02x\n", id1, id2, id3);
      spin_unlock_irqrestore(&(info->lock), flags);
        return -ENODEV;
    }

#if defined(OX950_DEBUG)
    switch (rev) {

        case 3:
          printk(KERN_DEBUG "bt950uart_cs: core is OX16C950B\n");
          break;

      case 6:
          printk(KERN_DEBUG "bt950uart_cs: core is OXCF950\n");
          break;

      case 8:
          printk(KERN_DEBUG "bt950uart_cs: core is OXCF950B\n");
          break;

      default:
          printk(KERN_DEBUG "bt950uart_cs: core revision: 0x%X\n", rev);
          break;
    }
#endif

    /* init ICR registers */
    outb(UART_TTL, iobase + UART_EMSR);
    outb(TR_TX_INT, iobase + UART_LSR); /* TX interrupt trigger level (0-127) */

    outb(UART_RTL, iobase + UART_EMSR);
    outb(TR_RX_INT, iobase + UART_LSR); /* RX interrupt trigger level (1-127) */

    outb(UART_FCL, iobase + UART_EMSR);
    outb(TR_CTL_LO, iobase + UART_LSR); /* auto flow control LOWER trigger level (0-127) */

    outb(UART_FCH, iobase + UART_EMSR);
    outb(TR_CTL_HI, iobase + UART_LSR); /* auto flow control HIGH trigger level (1-127) */

    outb(UART_ACR, iobase + UART_EMSR);
    outb(UART_ACR_TLENB, iobase + UART_LSR); /* disable ICR read access, enable trigger levels */ 
    
    spin_unlock_irqrestore(&(info->lock), flags);

    /* Timeout before it is safe to send the first HCI packet */
    set_current_state(TASK_INTERRUPTIBLE);
    schedule_timeout(HZ);
    
    return 0;

}


static int btuart_open(btuart_info_t *info) {

    struct hci_dev *hdev;
    int ret;

    spin_lock_init(&(info->lock));

    skb_queue_head_init(&(info->txq));

    info->rx_state = RECV_WAIT_PACKET_TYPE;
    info->rx_count = 0;
    clear_bit(XMIT_SENDING, &(info->tx_state));
    info->rx_skb = NULL;

    /* setup uart */
    if ((ret = setup_uart(info)) != 0)
      return ret;

    /* Initialize and register HCI device */
    hdev = &(info->hdev);

    hdev->type = HCI_PCCARD;
    hdev->driver_data = info;

    hdev->open     = btuart_hci_open;
    hdev->close    = btuart_hci_close;
    hdev->flush    = btuart_hci_flush;
    hdev->send     = btuart_hci_send_frame;
    hdev->destruct = btuart_hci_destruct;
    hdev->ioctl    = btuart_hci_ioctl;

    if (hci_register_dev(hdev) < 0) {
      printk(KERN_ERR "bt950uart_cs: Can't register HCI device %s.\n", hdev->name);
      return -ENODEV;
    }

    return 0;

}


static void stop_uart(btuart_info_t *info) {

    unsigned long flags;
    unsigned int iobase = info->link.io.BasePort1;

    spin_lock_irqsave(&(info->lock), flags);

    /* disable interrupts */
    outb(0, iobase + UART_IER);

    outb(0, iobase + UART_MCR);

    spin_unlock_irqrestore(&(info->lock), flags);

    return;
}


static int btuart_close(btuart_info_t *info) {

    struct hci_dev *hdev = &(info->hdev);

    btuart_hci_close(hdev);

    /* stop hardware */
    stop_uart(info);

    if (hci_unregister_dev(hdev) < 0)
      printk(KERN_ERR "bt950uart_cs: Can't unregister HCI device %s.\n", hdev->name);

    return 0;

}



/* ======================== Card services ======================== */


#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
static void cs_error(client_handle_t handle, int func, int ret) {

    error_info_t err = { func, ret };

    CardServices(ReportError, handle, &err);

}
#endif


static dev_link_t *btuart_attach(void) {

    btuart_info_t *info;
    client_reg_t client_reg;
    dev_link_t *link;
    int i, ret;


    /* Create new info device */
    info = kmalloc(sizeof(*info), GFP_KERNEL);
    if (!info)
      return NULL;
    memset(info, 0, sizeof(*info));


    link = &info->link;
    link->priv = info;

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
    link->release.function = &btuart_release;
    link->release.data = (u_long)link;
#endif
    link->io.Attributes1 = IO_DATA_PATH_WIDTH_8;
    link->io.NumPorts1 = 8;
    link->irq.Attributes = IRQ_TYPE_EXCLUSIVE | IRQ_HANDLE_PRESENT;
    link->irq.IRQInfo1 = IRQ_INFO2_VALID | IRQ_LEVEL_ID;

    if (irq_list[0] == -1)
      link->irq.IRQInfo2 = irq_mask;
    else
      for (i = 0; i < 4; i++)
          link->irq.IRQInfo2 |= 1 << irq_list[i];

    link->irq.Handler = btuart_interrupt;
    link->irq.Instance = info;

    link->conf.Attributes = CONF_ENABLE_IRQ;
    link->conf.IntType = INT_MEMORY_AND_IO;
    link->conf.Present = PRESENT_OPTION | PRESENT_STATUS | PRESENT_PIN_REPLACE | PRESENT_COPY;

    /* Register with Card Services */
    link->next = dev_list;
    dev_list = link;
    client_reg.dev_info = &dev_info;
    client_reg.Attributes = INFO_IO_CLIENT | INFO_CARD_SHARE;
    client_reg.EventMask =  CS_EVENT_CARD_INSERTION | CS_EVENT_CARD_REMOVAL |
                      CS_EVENT_RESET_PHYSICAL | CS_EVENT_CARD_RESET |
                            CS_EVENT_PM_SUSPEND | CS_EVENT_PM_RESUME;
    client_reg.event_handler = &btuart_event;
    client_reg.Version = 0x0210;
    client_reg.event_callback_args.client_data = link;

    ret = CardServices(RegisterClient, &link->handle, &client_reg);

    if (ret != CS_SUCCESS) {
      cs_error(link->handle, RegisterClient, ret);
      btuart_detach(link);
      return NULL;
    }

    return link;

}


static void btuart_detach(dev_link_t *link) {

    btuart_info_t *info = link->priv;
    dev_link_t **linkp;
    int ret;

    /* Locate device structure */
    for (linkp = &dev_list; *linkp; linkp = &(*linkp)->next)
      if (*linkp == link)
          break;

    if (*linkp == NULL)
      return;

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
    del_timer(&link->release);
#endif

    if (link->state & DEV_CONFIG)
      btuart_release((u_long)link);

    if (link->handle) {

      ret = CardServices(DeregisterClient, link->handle);
      
      if (ret != CS_SUCCESS)
          cs_error(link->handle, DeregisterClient, ret);
    }

    /* Unlink device structure, free bits */
    *linkp = link->next;

    kfree(info);

}


static int get_tuple(int fn, client_handle_t handle, tuple_t *tuple,
                 cisparse_t *parse) {

    int i;


    i = CardServices(fn, handle, tuple);

    if (i != CS_SUCCESS)
      return CS_NO_MORE_ITEMS;

    i = CardServices(GetTupleData, handle, tuple);

    if (i != CS_SUCCESS)
      return i;

    return CardServices(ParseTuple, handle, tuple, parse);

}


#define first_tuple(a, b, c) get_tuple(GetFirstTuple, a, b, c)
#define next_tuple(a, b, c) get_tuple(GetNextTuple, a, b, c)

static void btuart_config(dev_link_t *link) {

    static ioaddr_t base[4] = { 0x2f8, 0x3e8, 0x2e8, 0x0 };
    client_handle_t handle = link->handle;
    btuart_info_t *info = link->priv;
    tuple_t tuple;
    u_short buf[256];
    cisparse_t parse;
    cistpl_cftable_entry_t *cf = &parse.cftable_entry;
    config_info_t config;
    int i, j, try, last_ret, last_fn;


    tuple.TupleData = (cisdata_t *)buf;
    tuple.TupleOffset = 0;
    tuple.TupleDataMax = 255;
    tuple.Attributes = 0;

    /* Get configuration register information */
    tuple.DesiredTuple = CISTPL_CONFIG;
    last_ret = first_tuple(handle, &tuple, &parse);

    if (last_ret != CS_SUCCESS) {
      last_fn = ParseTuple;
      goto cs_failed;
    }
    
    link->conf.ConfigBase = parse.config.base;
    link->conf.Present = parse.config.rmask[0];

    /* Configure card */
    link->state |= DEV_CONFIG;
    i = CardServices(GetConfigurationInfo, handle, &config);
    link->conf.Vcc = config.Vcc;


    /* First pass: look for a config entry that looks normal. */
    tuple.TupleData = (cisdata_t *)buf;
    tuple.TupleOffset = 0; tuple.TupleDataMax = 255;
    tuple.Attributes = 0;
    tuple.DesiredTuple = CISTPL_CFTABLE_ENTRY;
    
    /* Two tries: without IO aliases, then with aliases */
    for (try = 0; try < 2; try++) {
      
      i = first_tuple(handle, &tuple, &parse);
    
      while (i != CS_NO_MORE_ITEMS) {

          if (i != CS_SUCCESS)
            goto next_entry;

          if (cf->vpp1.present & (1<<CISTPL_POWER_VNOM))
            link->conf.Vpp1 = link->conf.Vpp2 = cf->vpp1.param[CISTPL_POWER_VNOM]/10000;

          if ((cf->io.nwin > 0) && (cf->io.win[0].len == 8) && (cf->io.win[0].base != 0)) {
            link->conf.ConfigIndex = cf->index;
            link->io.BasePort1 = cf->io.win[0].base;
            link->io.IOAddrLines = (try == 0) ? 16 : cf->io.flags & CISTPL_IO_LINES_MASK;
        
            i = CardServices(RequestIO, link->handle, &link->io);

            if (i == CS_SUCCESS)
                goto found_port;
          }
next_entry:

          i = next_tuple(handle, &tuple, &parse);
      }
    }

    /* Second pass: try to find an entry that isn't picky about
    its base address, then try to grab any standard serial port
    address, and finally try to get any free port. */
    i = first_tuple(handle, &tuple, &parse);

    while (i != CS_NO_MORE_ITEMS) {
      if ((i == CS_SUCCESS) && (cf->io.nwin > 0) && ((cf->io.flags & CISTPL_IO_LINES_MASK) <= 3)) {
          link->conf.ConfigIndex = cf->index;

          for (j = 0; j < 5; j++) {
            link->io.BasePort1 = base[j];
            link->io.IOAddrLines = base[j] ? 16 : 3;

            i = CardServices(RequestIO, link->handle, &link->io);

            if (i == CS_SUCCESS)
                goto found_port;
          }
      }
    
      i = next_tuple(handle, &tuple, &parse);
    }

found_port:

    if (i != CS_SUCCESS) {
      printk(KERN_ERR "bt950uart_cs: No usable port range found. Giving up.\n");
      cs_error(link->handle, RequestIO, i);
      goto failed;
    }

    i = CardServices(RequestIRQ, link->handle, &link->irq);

    if (i != CS_SUCCESS) {
      cs_error(link->handle, RequestIRQ, i);
      link->irq.AssignedIRQ = 0;
    }

    i = CardServices(RequestConfiguration, link->handle, &link->conf);

    if (i != CS_SUCCESS) {
      cs_error(link->handle, RequestConfiguration, i);
      goto failed;
    }
  
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 5, 0)
    MOD_INC_USE_COUNT;
#endif

    if (btuart_open(info) != 0)
      goto failed;

    strcpy(info->node.dev_name, info->hdev.name);
    link->dev = &info->node;
    link->state &= ~DEV_CONFIG_PENDING;

    return;

cs_failed:

    cs_error(link->handle, last_fn, last_ret);

failed:

    btuart_release((u_long)link);
    link->state &= ~DEV_CONFIG_PENDING;

}


static void btuart_release(u_long arg) {

    dev_link_t *link = (dev_link_t *)arg;
    btuart_info_t *info = link->priv;

    if (link->state & DEV_PRESENT)
      btuart_close(info);

#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 5, 0)
    MOD_DEC_USE_COUNT;
#endif

    link->dev = NULL;

    CardServices(ReleaseConfiguration, link->handle);
    CardServices(ReleaseIO, link->handle, &link->io);
    CardServices(ReleaseIRQ, link->handle, &link->irq);

    link->state &= ~DEV_CONFIG;

}


static int btuart_event(event_t event, int priority, event_callback_args_t *args) {

    dev_link_t *link = args->client_data;
    btuart_info_t *info = link->priv;


    switch (event) {
    
      case CS_EVENT_CARD_REMOVAL:
          link->state &= ~DEV_PRESENT;
      
          if (link->state & DEV_CONFIG) {
            btuart_close(info);
            link->state |= DEV_RELEASE_PENDING;
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
            mod_timer(&link->release, jiffies + HZ/20);
#endif
          }
          break;

      case CS_EVENT_CARD_INSERTION:
          link->state |= DEV_PRESENT | DEV_CONFIG_PENDING;
          btuart_config(link);
          break;

      case CS_EVENT_PM_SUSPEND:
          link->state |= DEV_SUSPEND;
          /* Fall through... */

      case CS_EVENT_RESET_PHYSICAL:
          if (link->state & DEV_CONFIG) {
            stop_uart(info);
            CardServices(ReleaseConfiguration, link->handle);
          }
          break;

      case CS_EVENT_PM_RESUME:
          link->state &= ~DEV_SUSPEND;
          /* Fall through... */

      case CS_EVENT_CARD_RESET:
          if (link->state & DEV_CONFIG) {
            CardServices(RequestConfiguration, link->handle, &link->conf);
            setup_uart(info);
          }
          break;
    }

  return 0;

}



/* ======================== Module initialization ======================== */


int __init init_bt950uart_cs(void) {

    servinfo_t serv;
    int err;

    printk(KERN_ERR "bt950uart_cs: %s ver.%s\n", DRIVER_NAME, DRIVER_VERSION);

    CardServices(GetCardServicesInfo, &serv);
  
    if (serv.Revision != CS_RELEASE_CODE) {
      printk(KERN_ERR "bt950uart_cs: Card Services release does not match!\n");
      return -1;
    }

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
    err = register_pccard_driver(&dev_info, &btuart_attach, &btuart_detach);
#else
    err = pcmcia_register_driver(&btuart_driver);
#endif

    return err;

}


void __exit exit_bt950uart_cs(void) {

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
    unregister_pccard_driver(&dev_info);
#else
    pcmcia_unregister_driver(&btuart_driver);
#endif

    while (dev_list != NULL)
      btuart_detach(dev_list);

}


module_init(init_bt950uart_cs);
module_exit(exit_bt950uart_cs);

EXPORT_NO_SYMBOLS;

Generated by  Doxygen 1.6.0   Back to index