bluecard_cs.c

嵌入式Linux的蓝牙模块驱动

/*
 *
 *  Bluetooth driver for the Anycom BlueCard (LSE039/LSE041)
 *
 *  Copyright (C) 2001-2002  Marcel Holtmann <[e-mail]>
 *
 *
 *  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.
 *
 *  The initial developer of the original code is David A. Hinds
 *  <[e-mail]>.  Portions created by David A. Hinds
 *  are Copyright (C) 1999 David A. Hinds.  All Rights Reserved.
 *
 */

#include <linux/config.h>
#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/delay.h>
#include <linux/timer.h>
#include <linux/errno.h>
#include <linux/ptrace.h>
#include <linux/ioport.h>
#include <linux/spinlock.h>
#include <linux/skbuff.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 <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>



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


/* 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("Marcel Holtmann <[e-mail]>");
MODULE_DESCRIPTION("Bluetooth driver for the Anycom BlueCard (LSE039/LSE041)");
MODULE_LICENSE("GPL");



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


typedef struct bluecard_info_t {
	dev_link_t link;
	dev_node_t node;

	struct hci_dev *hdev;

	spinlock_t lock;		/* For serializing operations */
	struct timer_list timer;	/* For LED control */

	struct sk_buff_head txq;
	unsigned long tx_state;

	unsigned long rx_state;
	unsigned long rx_count;
	struct sk_buff *rx_skb;

	unsigned char ctrl_reg;
	unsigned long hw_state;		/* Status of the hardware and LED control */
} bluecard_info_t;


void bluecard_config(dev_link_t *link);
void bluecard_release(dev_link_t *link);
int bluecard_event(event_t event, int priority, event_callback_args_t *args);

static dev_info_t dev_info = "bluecard_cs";

dev_link_t *bluecard_attach(void);
void bluecard_detach(dev_link_t *);

static dev_link_t *dev_list = NULL;


/* Default baud rate: 57600, 115200, 230400 or 460800 */
#define DEFAULT_BAUD_RATE  230400


/* Hardware states */
#define CARD_READY             1
#define CARD_HAS_PCCARD_ID     4
#define CARD_HAS_POWER_LED     5
#define CARD_HAS_ACTIVITY_LED  6

/* Transmit states  */
#define XMIT_SENDING         1
#define XMIT_WAKEUP          2
#define XMIT_BUFFER_NUMBER   5	/* unset = buffer one, set = buffer two */
#define XMIT_BUF_ONE_READY   6
#define XMIT_BUF_TWO_READY   7
#define XMIT_SENDING_READY   8

/* 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

/* Special packet types */
#define PKT_BAUD_RATE_57600   0x80
#define PKT_BAUD_RATE_115200  0x81
#define PKT_BAUD_RATE_230400  0x82
#define PKT_BAUD_RATE_460800  0x83


/* These are the register offsets */
#define REG_COMMAND     0x20
#define REG_INTERRUPT   0x21
#define REG_CONTROL     0x22
#define REG_RX_CONTROL  0x24
#define REG_CARD_RESET  0x30
#define REG_LED_CTRL    0x30

/* REG_COMMAND */
#define REG_COMMAND_TX_BUF_ONE  0x01
#define REG_COMMAND_TX_BUF_TWO  0x02
#define REG_COMMAND_RX_BUF_ONE  0x04
#define REG_COMMAND_RX_BUF_TWO  0x08
#define REG_COMMAND_RX_WIN_ONE  0x00
#define REG_COMMAND_RX_WIN_TWO  0x10

/* REG_CONTROL */
#define REG_CONTROL_BAUD_RATE_57600   0x00
#define REG_CONTROL_BAUD_RATE_115200  0x01
#define REG_CONTROL_BAUD_RATE_230400  0x02
#define REG_CONTROL_BAUD_RATE_460800  0x03
#define REG_CONTROL_RTS               0x04
#define REG_CONTROL_BT_ON             0x08
#define REG_CONTROL_BT_RESET          0x10
#define REG_CONTROL_BT_RES_PU         0x20
#define REG_CONTROL_INTERRUPT         0x40
#define REG_CONTROL_CARD_RESET        0x80

/* REG_RX_CONTROL */
#define RTS_LEVEL_SHIFT_BITS  0x02



/* ======================== LED handling routines ======================== */


void bluecard_activity_led_timeout(u_long arg)
{
	bluecard_info_t *info = (bluecard_info_t *)arg;
	unsigned int iobase = info->link.io.BasePort1;

	if (!test_bit(CARD_HAS_PCCARD_ID, &(info->hw_state)))
		return;

	if (test_bit(CARD_HAS_ACTIVITY_LED, &(info->hw_state))) {
		/* Disable activity LED */
		outb(0x08 | 0x20, iobase + 0x30);
	} else {
		/* Disable power LED */
		outb(0x00, iobase + 0x30);
	}
}


static void bluecard_enable_activity_led(bluecard_info_t *info)
{
	unsigned int iobase = info->link.io.BasePort1;

	if (!test_bit(CARD_HAS_PCCARD_ID, &(info->hw_state)))
		return;

	if (test_bit(CARD_HAS_ACTIVITY_LED, &(info->hw_state))) {
		/* Enable activity LED */
		outb(0x10 | 0x40, iobase + 0x30);

		/* Stop the LED after HZ/4 */
		mod_timer(&(info->timer), jiffies + HZ / 4);
	} else {
		/* Enable power LED */
		outb(0x08 | 0x20, iobase + 0x30);

		/* Stop the LED after HZ/2 */
		mod_timer(&(info->timer), jiffies + HZ / 2);
	}
}



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


static int bluecard_write(unsigned int iobase, unsigned int offset, __u8 *buf, int len)
{
	int i, actual;

	actual = (len > 15) ? 15 : len;

	outb_p(actual, iobase + offset);

	for (i = 0; i < actual; i++)
		outb_p(buf[i], iobase + offset + i + 1);

	return actual;
}


static void bluecard_write_wakeup(bluecard_info_t *info)
{
	if (!info) {
		BT_ERR("Unknown device");
		return;
	}

	if (!test_bit(XMIT_SENDING_READY, &(info->tx_state)))
		return;

	if (test_and_set_bit(XMIT_SENDING, &(info->tx_state))) {
		set_bit(XMIT_WAKEUP, &(info->tx_state));
		return;
	}

	do {
		register unsigned int iobase = info->link.io.BasePort1;
		register unsigned int offset;
		register unsigned char command;
		register unsigned long ready_bit;
		register struct sk_buff *skb;
		register int len;

		clear_bit(XMIT_WAKEUP, &(info->tx_state));

		if (!(info->link.state & DEV_PRESENT))
			return;

		if (test_bit(XMIT_BUFFER_NUMBER, &(info->tx_state))) {
			if (!test_bit(XMIT_BUF_TWO_READY, &(info->tx_state)))
				break;
			offset = 0x10;
			command = REG_COMMAND_TX_BUF_TWO;
			ready_bit = XMIT_BUF_TWO_READY;
		} else {
			if (!test_bit(XMIT_BUF_ONE_READY, &(info->tx_state)))
				break;
			offset = 0x00;
			command = REG_COMMAND_TX_BUF_ONE;
			ready_bit = XMIT_BUF_ONE_READY;
		}

		if (!(skb = skb_dequeue(&(info->txq))))
			break;

		if (skb->pkt_type & 0x80) {
			/* Disable RTS */
			info->ctrl_reg |= REG_CONTROL_RTS;
			outb(info->ctrl_reg, iobase + REG_CONTROL);
		}

		/* Activate LED */
		bluecard_enable_activity_led(info);

		/* Send frame */
		len = bluecard_write(iobase, offset, skb->data, skb->len);

		/* Tell the FPGA to send the data */
		outb_p(command, iobase + REG_COMMAND);

		/* Mark the buffer as dirty */
		clear_bit(ready_bit, &(info->tx_state));

		if (skb->pkt_type & 0x80) {

			wait_queue_head_t wait;
			unsigned char baud_reg;

			switch (skb->pkt_type) {
			case PKT_BAUD_RATE_460800:
				baud_reg = REG_CONTROL_BAUD_RATE_460800;
				break;
			case PKT_BAUD_RATE_230400:
				baud_reg = REG_CONTROL_BAUD_RATE_230400;
				break;
			case PKT_BAUD_RATE_115200:
				baud_reg = REG_CONTROL_BAUD_RATE_115200;
				break;
			case PKT_BAUD_RATE_57600:
				/* Fall through... */
			default:
				baud_reg = REG_CONTROL_BAUD_RATE_57600;
				break;
			}

			/* Wait until the command reaches the baseband */
			init_waitqueue_head(&wait);
			interruptible_sleep_on_timeout(&wait, HZ / 10);

			/* Set baud on baseband */
			info->ctrl_reg &= ~0x03;
			info->ctrl_reg |= baud_reg;
			outb(info->ctrl_reg, iobase + REG_CONTROL);

			/* Enable RTS */
			info->ctrl_reg &= ~REG_CONTROL_RTS;
			outb(info->ctrl_reg, iobase + REG_CONTROL);

			/* Wait before the next HCI packet can be send */
			interruptible_sleep_on_timeout(&wait, HZ);

		}

		if (len == skb->len) {
			kfree_skb(skb);
		} else {
			skb_pull(skb, len);
			skb_queue_head(&(info->txq), skb);
		}

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

		/* Change buffer */
		change_bit(XMIT_BUFFER_NUMBER, &(info->tx_state));

	} while (test_bit(XMIT_WAKEUP, &(info->tx_state)));

	clear_bit(XMIT_SENDING, &(info->tx_state));
}


static int bluecard_read(unsigned int iobase, unsigned int offset, __u8 *buf, int size)
{
	int i, n, len;

	outb(REG_COMMAND_RX_WIN_ONE, iobase + REG_COMMAND);

	len = inb(iobase + offset);
	n = 0;
	i = 1;

	while (n < len) {

		if (i == 16) {
			outb(REG_COMMAND_RX_WIN_TWO, iobase + REG_COMMAND);
			i = 0;
		}

		buf[n] = inb(iobase + offset + i);

		n++;
		i++;

	}

	return len;
}


static void bluecard_receive(bluecard_info_t *info, unsigned int offset)
{
	unsigned int iobase;
	unsigned char buf[31];
	int i, len;

	if (!info) {
		BT_ERR("Unknown device");
		return;
	}

	iobase = info->link.io.BasePort1;

	if (test_bit(XMIT_SENDING_READY, &(info->tx_state)))
		bluecard_enable_activity_led(info);

	len = bluecard_read(iobase, offset, buf, sizeof(buf));

	for (i = 0; i < len; i++) {

		/* Allocate packet */
		if (info->rx_skb == NULL) {
			info->rx_state = RECV_WAIT_PACKET_TYPE;
			info->rx_count = 0;
			if (!(info->rx_skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC))) {
				BT_ERR("Can't allocate mem for new packet");
				return;
			}
		}

		if (info->rx_state == RECV_WAIT_PACKET_TYPE) {

			info->rx_skb->dev = (void *) info->hdev;
			info->rx_skb->pkt_type = buf[i];

			switch (info->rx_skb->pkt_type) {

			case 0x00:
				/* init packet */
				if (offset != 0x00) {
					set_bit(XMIT_BUF_ONE_READY, &(info->tx_state));
					set_bit(XMIT_BUF_TWO_READY, &(info->tx_state));
					set_bit(XMIT_SENDING_READY, &(info->tx_state));
					bluecard_write_wakeup(info);
				}

				kfree_skb(info->rx_skb);
				info->rx_skb = NULL;
				break;

			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:
				/* unknown packet */
				BT_ERR("Unknown HCI packet with type 0x%02x received", info->rx_skb->pkt_type);
				info->hdev->stat.err_rx++;

				kfree_skb(info->rx_skb);
				info->rx_skb = NULL;
				break;

			}

		} else {

			*skb_put(info->rx_skb, 1) = buf[i];
			info->rx_count--;

			if (info->rx_count == 0) {

				int dlen;
				struct hci_event_hdr *eh;
				struct hci_acl_hdr *ah;
				struct hci_sco_hdr *sh;

				switch (info->rx_state) {

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

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

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

				case RECV_WAIT_DATA:
					hci_recv_frame(info->rx_skb);
					info->rx_skb = NULL;
					break;

				}

			}

		}


	}

	info->hdev->stat.byte_rx += len;
}


static irqreturn_t bluecard_interrupt(int irq, void *dev_inst, struct pt_regs *regs)
{
	bluecard_info_t *info = dev_inst;
	unsigned int iobase;
	unsigned char reg;

	if (!info || !info->hdev) {
		BT_ERR("Call of irq %d for unknown device", irq);
		return IRQ_NONE;
	}

	if (!test_bit(CARD_READY, &(info->hw_state)))
		return IRQ_HANDLED;

	iobase = info->link.io.BasePort1;

	spin_lock(&(info->lock));

	/* Disable interrupt */
	info->ctrl_reg &= ~REG_CONTROL_INTERRUPT;
	outb(info->ctrl_reg, iobase + REG_CONTROL);

	reg = inb(iobase + REG_INTERRUPT);

	if ((reg != 0x00) && (reg != 0xff)) {

		if (reg & 0x04) {
			bluecard_receive(info, 0x00);
			outb(0x04, iobase + REG_INTERRUPT);
			outb(REG_COMMAND_RX_BUF_ONE, iobase + REG_COMMAND);
		}

		if (reg & 0x08) {
			bluecard_receive(info, 0x10);
			outb(0x08, iobase + REG_INTERRUPT);
			outb(REG_COMMAND_RX_BUF_TWO, iobase + REG_COMMAND);
		}

		if (reg & 0x01) {
			set_bit(XMIT_BUF_ONE_READY, &(info->tx_state));
			outb(0x01, iobase + REG_INTERRUPT);
			bluecard_write_wakeup(info);
		}

		if (reg & 0x02) {
			set_bit(XMIT_BUF_TWO_READY, &(info->tx_state));
			outb(0x02, iobase + REG_INTERRUPT);
			bluecard_write_wakeup(info);
		}

	}

	/* Enable interrupt */
	info->ctrl_reg |= REG_CONTROL_INTERRUPT;
	outb(info->ctrl_reg, iobase + REG_CONTROL);