/* * * Driver for Bluetooth PCMCIA cards with HCI UART interface * * Copyright (C) 2001-2002 Marcel Holtmann <marcel@holtmann.org> * * * 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 * <dahinds@users.sourceforge.net>. 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/errno.h> #include <linux/ptrace.h> #include <linux/ioport.h> #include <linux/spinlock.h> #include <linux/moduleparam.h> #include <linux/skbuff.h> #include <linux/string.h> #include <linux/serial.h> #include <linux/serial_reg.h> #include <linux/bitops.h> #include <asm/system.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 ======================== */ MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); MODULE_DESCRIPTION("Bluetooth driver for Bluetooth PCMCIA cards with HCI UART interface"); MODULE_LICENSE("GPL"); /* ======================== 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 tx_state; unsigned long rx_state; unsigned long rx_count; struct sk_buff *rx_skb; } btuart_info_t; static void btuart_config(dev_link_t *link); static void btuart_release(dev_link_t *link); static int btuart_event(event_t event, int priority, event_callback_args_t *args); static dev_info_t dev_info = "btuart_cs"; static dev_link_t *btuart_attach(void); static void btuart_detach(dev_link_t *); static dev_link_t *dev_list = NULL; /* Maximum baud rate */ #define SPEED_MAX 115200 /* Default baud rate: 57600, 115200, 230400 or 460800 */ #define DEFAULT_BAUD_RATE 115200 /* Transmit states */ #define XMIT_SENDING 1 #define XMIT_WAKEUP 2 #define XMIT_WAITING 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 /* ======================== Interrupt handling ======================== */ static int btuart_write(unsigned int iobase, int fifo_size, __u8 *buf, int len) { int actual = 0; /* Tx FIFO should be empty */ if (!(inb(iobase + UART_LSR) & UART_LSR_THRE)) return 0; /* Fill FIFO with current frame */ while ((fifo_size-- > 0) && (actual < len)) { /* Transmit next byte */ outb(buf[actual], iobase + UART_TX); actual++; } return actual; } static void btuart_write_wakeup(btuart_info_t *info) { if (!info) { BT_ERR("Unknown device"); 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 struct sk_buff *skb; register int len; clear_bit(XMIT_WAKEUP, &(info->tx_state)); if (!(info->link.state & DEV_PRESENT)) return; if (!(skb = skb_dequeue(&(info->txq)))) break; /* Send frame */ len = btuart_write(iobase, 16, skb->data, skb->len); set_bit(XMIT_WAKEUP, &(info->tx_state)); if (len == skb->len) { kfree_skb(skb); } else { skb_pull(skb, len); skb_queue_head(&(info->txq), skb); } info->hdev->stat.byte_tx += len; } while (test_bit(XMIT_WAKEUP, &(info->tx_state))); clear_bit(XMIT_SENDING, &(info->tx_state)); } static void btuart_receive(btuart_info_t *info) { unsigned int iobase; int boguscount = 0; if (!info) { BT_ERR("Unknown device"); return; } iobase = info->link.io.BasePort1; do { info->hdev->stat.byte_rx++; /* 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 = inb(iobase + UART_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: /* Unknown packet */ BT_ERR("Unknown HCI packet with type 0x%02x received", info->rx_skb->pkt_type); info->hdev->stat.err_rx++; clear_bit(HCI_RUNNING, &(info->hdev->flags)); kfree_skb(info->rx_skb); info->rx_skb = NULL; break; } } else { *skb_put(info->rx_skb, 1) = inb(iobase + UART_RX); 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; } } } /* Make sure we don't stay here too long */ if (boguscount++ > 16) break; } while (inb(iobase + UART_LSR) & UART_LSR_DR); } static irqreturn_t btuart_interrupt(int irq, void *dev_inst, struct pt_regs *regs) { btuart_info_t *info = dev_inst; unsigned int iobase; int boguscount = 0; int iir, lsr; if (!info || !info->hdev) { BT_ERR("Call of irq %d for unknown device", irq); return IRQ_NONE; } iobase = info->link.io.BasePort1; spin_lock(&(info->lock)); iir = inb(iobase + UART_IIR) & UART_IIR_ID; while (iir) { /* Clear interrupt */ lsr = inb(iobase + UART_LSR); switch (iir) { case UART_IIR_RLSI: BT_ERR("RLSI"); break; case UART_IIR_RDI: /* Receive interrupt */ btuart_receive(info); break; case UART_IIR_THRI: if (lsr & UART_LSR_THRE) { /* Transmitter ready for data */ btuart_write_wakeup(info); } break; default: BT_ERR("Unhandled IIR=%#x", iir); break; } /* Make sure we don't stay here too long */ if (boguscount++ > 100) break; iir = inb(iobase + UART_IIR) & UART_IIR_ID; } spin_unlock(&(info->lock)); return IRQ_HANDLED; } static void btuart_change_speed(btuart_info_t *info, unsigned int speed) { unsigned long flags; unsigned int iobase; int fcr; /* FIFO control reg */ int lcr; /* Line control reg */ int divisor; if (!info) { BT_ERR("Unknown device"); return; } iobase = info->link.io.BasePort1; spin_lock_irqsave(&(info->lock), flags); /* Turn off interrupts */ outb(0, iobase + UART_IER); divisor = SPEED_MAX / speed; fcr = UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT; /* * Use trigger level 1 to avoid 3 ms. timeout delay at 9600 bps, and * almost 1,7 ms at 19200 bps. At speeds above that we can just forget * about this timeout since it will always be fast enough. */ if (speed < 38400) fcr |= UART_FCR_TRIGGER_1; else fcr |= UART_FCR_TRIGGER_14; /* Bluetooth cards use 8N1 */ lcr = UART_LCR_WLEN8; outb(UART_LCR_DLAB | lcr, iobase + UART_LCR); /* Set DLAB */ outb(divisor & 0xff, iobase + UART_DLL); /* Set speed */ outb(divisor >> 8, iobase + UART_DLM); outb(lcr, iobase + UART_LCR); /* Set 8N1 */ outb(fcr, iobase + UART_FCR); /* Enable FIFO's */ /* Turn on interrups */ outb(UART_IER_RLSI | UART_IER_RDI | UART_IER_THRI, iobase + UART_IER); spin_unlock_irqrestore(&(info->lock), flags); } /* ======================== 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) { btuart_info_t *info; struct hci_dev *hdev = (struct hci_dev *)(skb->dev); if (!hdev) { BT_ERR("Frame for unknown HCI device (hdev=NULL)"); 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); btuart_write_wakeup(info); return 0; } static void btuart_hci_destruct(struct hci_dev *hdev) { } static int btuart_hci_ioctl(struct hci_dev *hdev, unsigned int cmd, unsigned long arg) { return -ENOIOCTLCMD; } /* ======================== Card services HCI interaction ======================== */ static int btuart_open(btuart_info_t *info) { unsigned long flags; unsigned int iobase = info->link.io.BasePort1; struct hci_dev *hdev; spin_lock_init(&(info->lock)); skb_queue_head_init(&(info->txq)); info->rx_state = RECV_WAIT_PACKET_TYPE; info->rx_count = 0; info->rx_skb = NULL; /* Initialize HCI device */ hdev = hci_alloc_dev(); if (!hdev) { BT_ERR("Can't allocate HCI device"); return -ENOMEM; } info->hdev = 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; hdev->owner = THIS_MODULE; spin_lock_irqsave(&(info->lock), flags); /* Reset UART */ outb(0, iobase + UART_MCR); /* Turn off interrupts */ outb(0, iobase + UART_IER); /* Initialize UART */ outb(UART_LCR_WLEN8, iobase + UART_LCR); /* Reset DLAB */ outb((UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2), iobase + UART_MCR); /* Turn on interrupts */ // outb(UART_IER_RLSI | UART_IER_RDI | UART_IER_THRI, iobase + UART_IER); spin_unlock_irqrestore(&(info->lock), flags); btuart_change_speed(info, DEFAULT_BAUD_RATE); /* Timeout before it is safe to send the first HCI packet */ msleep(1000); /* Register HCI device */ if (hci_register_dev(hdev) < 0) { BT_ERR("Can't register HCI device"); info->hdev = NULL; hci_free_dev(hdev); return -ENODEV; } return 0; } static int btuart_close(btuart_info_t *info) { unsigned long flags; unsigned int iobase = info->link.io.BasePort1; struct hci_dev *hdev = info->hdev; if (!hdev) return -ENODEV; btuart_hci_close(hdev); spin_lock_irqsave(&(info->lock), flags); /* Reset UART */ outb(0, iobase + UART_MCR); /* Turn off interrupts */ outb(0, iobase + UART_IER); spin_unlock_irqrestore(&(info->lock), flags); if (hci_unregister_dev(hdev) < 0) BT_ERR("Can't unregister HCI device %s", hdev->name); hci_free_dev(hdev); return 0; } static dev_link_t *btuart_attach(void) { btuart_info_t *info; client_reg_t client_reg; dev_link_t *link; int 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; 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_LEVEL_ID; link->irq.Handler = btuart_interrupt; link->irq.Instance = info; link->conf.Attributes = CONF_ENABLE_IRQ; link->conf.Vcc = 50; link->conf.IntType = INT_MEMORY_AND_IO; /* Register with Card Services */ link->next = dev_list; dev_list = link; client_reg.dev_info = &dev_info; 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 = pcmcia_register_client(&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 (link->state & DEV_CONFIG) btuart_release(link); if (link->handle) { ret = pcmcia_deregister_client(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(client_handle_t handle, tuple_t *tuple, cisparse_t *parse) { int i; i = pcmcia_get_tuple_data(handle, tuple); if (i != CS_SUCCESS) return i; return pcmcia_parse_tuple(handle, tuple, parse); } static int first_tuple(client_handle_t handle, tuple_t *tuple, cisparse_t *parse) { if (pcmcia_get_first_tuple(handle, tuple) != CS_SUCCESS) return CS_NO_MORE_ITEMS; return get_tuple(handle, tuple, parse); } static int next_tuple(client_handle_t handle, tuple_t *tuple, cisparse_t *parse) { if (pcmcia_get_next_tuple(handle, tuple) != CS_SUCCESS) return CS_NO_MORE_ITEMS; return get_tuple(handle, tuple, parse); } static void btuart_config(dev_link_t *link) { static kio_addr_t base[5] = { 0x3f8, 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 = pcmcia_get_configuration_info(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 = pcmcia_request_io(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 = pcmcia_request_io(link->handle, &link->io); if (i == CS_SUCCESS) goto found_port; } } i = next_tuple(handle, &tuple, &parse); } found_port: if (i != CS_SUCCESS) { BT_ERR("No usable port range found"); cs_error(link->handle, RequestIO, i); goto failed; } i = pcmcia_request_irq(link->handle, &link->irq); if (i != CS_SUCCESS) { cs_error(link->handle, RequestIRQ, i); link->irq.AssignedIRQ = 0; } i = pcmcia_request_configuration(link->handle, &link->conf); if (i != CS_SUCCESS) { cs_error(link->handle, RequestConfiguration, i); goto failed; } 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(link); } static void btuart_release(dev_link_t *link) { btuart_info_t *info = link->priv; if (link->state & DEV_PRESENT) btuart_close(info); link->dev = NULL; pcmcia_release_configuration(link->handle); pcmcia_release_io(link->handle, &link->io); pcmcia_release_irq(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); btuart_release(link); } 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) pcmcia_release_configuration(link->handle); break; case CS_EVENT_PM_RESUME: link->state &= ~DEV_SUSPEND; /* Fall through... */ case CS_EVENT_CARD_RESET: if (DEV_OK(link)) pcmcia_request_configuration(link->handle, &link->conf); break; } return 0; } static struct pcmcia_device_id btuart_ids[] = { /* don't use this driver. Use serial_cs + hci_uart instead */ PCMCIA_DEVICE_NULL }; MODULE_DEVICE_TABLE(pcmcia, btuart_ids); static struct pcmcia_driver btuart_driver = { .owner = THIS_MODULE, .drv = { .name = "btuart_cs", }, .attach = btuart_attach, .detach = btuart_detach, .id_table = btuart_ids, }; static int __init init_btuart_cs(void) { return pcmcia_register_driver(&btuart_driver); } static void __exit exit_btuart_cs(void) { pcmcia_unregister_driver(&btuart_driver); BUG_ON(dev_list != NULL); } module_init(init_btuart_cs); module_exit(exit_btuart_cs);