Emulate a serial bluetooth HCI with H4+ extensions and attach to n8x0's UART.

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5343 c046a42c-6fe2-441c-8c8c-71466251a162

1 files changed, 456 insertions, 0 deletions

diff --git a/hw/bt-hci-csr.c b/hw/bt-hci-csr.c
new file mode 100644
index 0000000000..62943ffdac
--- /dev/null
+++ b/hw/bt-hci-csr.c
@@ -0,0 +1,456 @@
+/*
+ * Bluetooth serial HCI transport.
+ * CSR41814 HCI with H4p vendor extensions.
+ *
+ * Copyright (C) 2008 Andrzej Zaborowski  <balrog@zabor.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 or
+ * (at your option) version 3 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include "qemu-common.h"
+#include "qemu-char.h"
+#include "qemu-timer.h"
+#include "irq.h"
+#include "sysemu.h"
+#include "net.h"
+#include "bt.h"
+
+struct csrhci_s {
+    int enable;
+    qemu_irq *pins;
+    int pin_state;
+    int modem_state;
+    CharDriverState chr;
+#define FIFO_LEN	4096
+    int out_start;
+    int out_len;
+    int out_size;
+    uint8_t outfifo[FIFO_LEN * 2];
+    uint8_t inpkt[FIFO_LEN];
+    int in_len;
+    int in_hdr;
+    int in_data;
+    QEMUTimer *out_tm;
+    int64_t baud_delay;
+
+    bdaddr_t bd_addr;
+    struct HCIInfo *hci;
+};
+
+/* H4+ packet types */
+enum {
+    H4_CMD_PKT   = 1,
+    H4_ACL_PKT   = 2,
+    H4_SCO_PKT   = 3,
+    H4_EVT_PKT   = 4,
+    H4_NEG_PKT   = 6,
+    H4_ALIVE_PKT = 7,
+};
+
+/* CSR41814 negotiation start magic packet */
+static const uint8_t csrhci_neg_packet[] = {
+    H4_NEG_PKT, 10,
+    0x00, 0xa0, 0x01, 0x00, 0x00,
+    0x4c, 0x00, 0x96, 0x00, 0x00,
+};
+
+/* CSR41814 vendor-specific command OCFs */
+enum {
+    OCF_CSR_SEND_FIRMWARE = 0x000,
+};
+
+static inline void csrhci_fifo_wake(struct csrhci_s *s)
+{
+    if (!s->enable || !s->out_len)
+        return;
+
+    /* XXX: Should wait for s->modem_state & CHR_TIOCM_RTS? */
+    if (s->chr.chr_can_read && s->chr.chr_can_read(s->chr.handler_opaque) &&
+                    s->chr.chr_read) {
+        s->chr.chr_read(s->chr.handler_opaque,
+                        s->outfifo + s->out_start ++, 1);
+        s->out_len --;
+        if (s->out_start >= s->out_size) {
+            s->out_start = 0;
+            s->out_size = FIFO_LEN;
+        }
+    }
+
+    if (s->out_len)
+        qemu_mod_timer(s->out_tm, qemu_get_clock(vm_clock) + s->baud_delay);
+}
+
+#define csrhci_out_packetz(s, len) memset(csrhci_out_packet(s, len), 0, len)
+static uint8_t *csrhci_out_packet(struct csrhci_s *s, int len)
+{
+    int off = s->out_start + s->out_len;
+
+    /* TODO: do the padding here, i.e. align len */
+    s->out_len += len;
+
+    if (off < FIFO_LEN) {
+        if (off + len > FIFO_LEN && (s->out_size = off + len) > FIFO_LEN * 2) {
+            fprintf(stderr, "%s: can't alloc %i bytes\n", __FUNCTION__, len);
+            exit(-1);
+        }
+        return s->outfifo + off;
+    }
+
+    if (s->out_len > s->out_size) {
+        fprintf(stderr, "%s: can't alloc %i bytes\n", __FUNCTION__, len);
+        exit(-1);
+    }
+
+    return s->outfifo + off - s->out_size;
+}
+
+static inline uint8_t *csrhci_out_packet_csr(struct csrhci_s *s,
+                int type, int len)
+{
+    uint8_t *ret = csrhci_out_packetz(s, len + 2);
+
+    *ret ++ = type;
+    *ret ++ = len;
+
+    return ret;
+}
+
+static inline uint8_t *csrhci_out_packet_event(struct csrhci_s *s,
+                int evt, int len)
+{
+    uint8_t *ret = csrhci_out_packetz(s,
+                    len + 1 + sizeof(struct hci_event_hdr));
+
+    *ret ++ = H4_EVT_PKT;
+    ((struct hci_event_hdr *) ret)->evt = evt;
+    ((struct hci_event_hdr *) ret)->plen = len;
+
+    return ret + sizeof(struct hci_event_hdr);
+}
+
+static void csrhci_in_packet_vendor(struct csrhci_s *s, int ocf,
+                uint8_t *data, int len)
+{
+    int offset;
+    uint8_t *rpkt;
+
+    switch (ocf) {
+    case OCF_CSR_SEND_FIRMWARE:
+        /* Check if this is the bd_address packet */
+        if (len >= 18 + 8 && data[12] == 0x01 && data[13] == 0x00) {
+            offset = 18;
+            s->bd_addr.b[0] = data[offset + 7];	/* Beyond cmd packet end(!?) */
+            s->bd_addr.b[1] = data[offset + 6];
+            s->bd_addr.b[2] = data[offset + 4];
+            s->bd_addr.b[3] = data[offset + 0];
+            s->bd_addr.b[4] = data[offset + 3];
+            s->bd_addr.b[5] = data[offset + 2];
+
+            s->hci->bdaddr_set(s->hci, s->bd_addr.b);
+            fprintf(stderr, "%s: bd_address loaded from firmware: "
+                            "%02x:%02x:%02x:%02x:%02x:%02x\n", __FUNCTION__,
+                            s->bd_addr.b[0], s->bd_addr.b[1], s->bd_addr.b[2],
+                            s->bd_addr.b[3], s->bd_addr.b[4], s->bd_addr.b[5]);
+        }
+
+        rpkt = csrhci_out_packet_event(s, EVT_VENDOR, 11);
+        /* Status bytes: no error */
+        rpkt[9] = 0x00;
+        rpkt[10] = 0x00;
+        break;
+
+    default:
+        fprintf(stderr, "%s: got a bad CMD packet\n", __FUNCTION__);
+        return;
+    }
+
+    csrhci_fifo_wake(s);
+}
+
+static void csrhci_in_packet(struct csrhci_s *s, uint8_t *pkt)
+{
+    uint8_t *rpkt;
+    int opc;
+
+    switch (*pkt ++) {
+    case H4_CMD_PKT:
+        opc = le16_to_cpu(((struct hci_command_hdr *) pkt)->opcode);
+        if (cmd_opcode_ogf(opc) == OGF_VENDOR_CMD) {
+            csrhci_in_packet_vendor(s, cmd_opcode_ocf(opc),
+                            pkt + sizeof(struct hci_command_hdr),
+                            s->in_len - sizeof(struct hci_command_hdr) - 1);
+            return;
+        }
+
+        /* TODO: if the command is OCF_READ_LOCAL_COMMANDS or the likes,
+         * we need to send it to the HCI layer and then add our supported
+         * commands to the returned mask (such as OGF_VENDOR_CMD).  With
+         * bt-hci.c we could just have hooks for this kind of commands but
+         * we can't with bt-host.c.  */
+
+        s->hci->cmd_send(s->hci, pkt, s->in_len - 1);
+        break;
+
+    case H4_EVT_PKT:
+        goto bad_pkt;
+
+    case H4_ACL_PKT:
+        s->hci->acl_send(s->hci, pkt, s->in_len - 1);
+        break;
+
+    case H4_SCO_PKT:
+        s->hci->sco_send(s->hci, pkt, s->in_len - 1);
+        break;
+
+    case H4_NEG_PKT:
+        if (s->in_hdr != sizeof(csrhci_neg_packet) ||
+                        memcmp(pkt - 1, csrhci_neg_packet, s->in_hdr)) {
+            fprintf(stderr, "%s: got a bad NEG packet\n", __FUNCTION__);
+            return;
+        }
+        pkt += 2;
+
+        rpkt = csrhci_out_packet_csr(s, H4_NEG_PKT, 10);
+
+        *rpkt ++ = 0x20;	/* Operational settings negotation Ok */
+        memcpy(rpkt, pkt, 7); rpkt += 7;
+        *rpkt ++ = 0xff;
+        *rpkt ++ = 0xff;
+        break;
+
+    case H4_ALIVE_PKT:
+        if (s->in_hdr != 4 || pkt[1] != 0x55 || pkt[2] != 0x00) {
+            fprintf(stderr, "%s: got a bad ALIVE packet\n", __FUNCTION__);
+            return;
+        }
+
+        rpkt = csrhci_out_packet_csr(s, H4_ALIVE_PKT, 2);
+
+        *rpkt ++ = 0xcc;
+        *rpkt ++ = 0x00;
+        break;
+
+    default:
+    bad_pkt:
+        /* TODO: error out */
+        fprintf(stderr, "%s: got a bad packet\n", __FUNCTION__);
+        break;
+    }
+
+    csrhci_fifo_wake(s);
+}
+
+static int csrhci_header_len(const uint8_t *pkt)
+{
+    switch (pkt[0]) {
+    case H4_CMD_PKT:
+        return HCI_COMMAND_HDR_SIZE;
+    case H4_EVT_PKT:
+        return HCI_EVENT_HDR_SIZE;
+    case H4_ACL_PKT:
+        return HCI_ACL_HDR_SIZE;
+    case H4_SCO_PKT:
+        return HCI_SCO_HDR_SIZE;
+    case H4_NEG_PKT:
+        return pkt[1] + 1;
+    case H4_ALIVE_PKT:
+        return 3;
+    }
+
+    exit(-1);
+}
+
+static int csrhci_data_len(const uint8_t *pkt)
+{
+    switch (*pkt ++) {
+    case H4_CMD_PKT:
+        /* It seems that vendor-specific command packets for H4+ are all
+         * one byte longer than indicated in the standard header.  */
+        if (le16_to_cpu(((struct hci_command_hdr *) pkt)->opcode) == 0xfc00)
+            return (((struct hci_command_hdr *) pkt)->plen + 1) & ~1;
+
+        return ((struct hci_command_hdr *) pkt)->plen;
+    case H4_EVT_PKT:
+        return ((struct hci_event_hdr *) pkt)->plen;
+    case H4_ACL_PKT:
+        return le16_to_cpu(((struct hci_acl_hdr *) pkt)->dlen);
+    case H4_SCO_PKT:
+        return ((struct hci_sco_hdr *) pkt)->dlen;
+    case H4_NEG_PKT:
+    case H4_ALIVE_PKT:
+        return 0;
+    }
+
+    exit(-1);
+}
+
+static int csrhci_write(struct CharDriverState *chr,
+                const uint8_t *buf, int len)
+{
+    struct csrhci_s *s = (struct csrhci_s *) chr->opaque;
+    int plen = s->in_len;
+
+    if (!s->enable)
+        return 0;
+
+    s->in_len += len;
+    memcpy(s->inpkt + plen, buf, len);
+
+    while (1) {
+        if (s->in_len >= 2 && plen < 2)
+            s->in_hdr = csrhci_header_len(s->inpkt) + 1;
+
+        if (s->in_len >= s->in_hdr && plen < s->in_hdr)
+            s->in_data = csrhci_data_len(s->inpkt) + s->in_hdr;
+
+        if (s->in_len >= s->in_data) {
+            csrhci_in_packet(s, s->inpkt);
+
+            memmove(s->inpkt, s->inpkt + s->in_len, s->in_len - s->in_data);
+            s->in_len -= s->in_data;
+            s->in_hdr = INT_MAX;
+            s->in_data = INT_MAX;
+            plen = 0;
+        } else
+            break;
+    }
+
+    return len;
+}
+
+static void csrhci_out_hci_packet_event(void *opaque,
+                const uint8_t *data, int len)
+{
+    struct csrhci_s *s = (struct csrhci_s *) opaque;
+    uint8_t *pkt = csrhci_out_packet(s, (len + 2) & ~1);	/* Align */
+
+    *pkt ++ = H4_EVT_PKT;
+    memcpy(pkt, data, len);
+
+    csrhci_fifo_wake(s);
+}
+
+static void csrhci_out_hci_packet_acl(void *opaque,
+                const uint8_t *data, int len)
+{
+    struct csrhci_s *s = (struct csrhci_s *) opaque;
+    uint8_t *pkt = csrhci_out_packet(s, (len + 2) & ~1);	/* Align */
+
+    *pkt ++ = H4_ACL_PKT;
+    pkt[len & ~1] = 0;
+    memcpy(pkt, data, len);
+
+    csrhci_fifo_wake(s);
+}
+
+static int csrhci_ioctl(struct CharDriverState *chr, int cmd, void *arg)
+{
+    QEMUSerialSetParams *ssp;
+    struct csrhci_s *s = (struct csrhci_s *) chr->opaque;
+    int prev_state = s->modem_state;
+
+    switch (cmd) {
+    case CHR_IOCTL_SERIAL_SET_PARAMS:
+        ssp = (QEMUSerialSetParams *) arg;
+        s->baud_delay = ticks_per_sec / ssp->speed;
+        /* Moments later... (but shorter than 100ms) */
+        s->modem_state |= CHR_TIOCM_CTS;
+        break;
+
+    case CHR_IOCTL_SERIAL_GET_TIOCM:
+        *(int *) arg = s->modem_state;
+        break;
+
+    case CHR_IOCTL_SERIAL_SET_TIOCM:
+        s->modem_state = *(int *) arg;
+        if (~s->modem_state & prev_state & CHR_TIOCM_RTS)
+            s->modem_state &= ~CHR_TIOCM_CTS;
+        break;
+
+    default:
+        return -ENOTSUP;
+    }
+    return 0;
+}
+
+static void csrhci_reset(struct csrhci_s *s)
+{
+    s->out_len = 0;
+    s->out_size = FIFO_LEN;
+    s->in_len = 0;
+    s->baud_delay = ticks_per_sec;
+    s->enable = 0;
+    s->in_hdr = INT_MAX;
+    s->in_data = INT_MAX;
+
+    s->modem_state = 0;
+    /* After a while... (but sooner than 10ms) */
+    s->modem_state |= CHR_TIOCM_CTS;
+
+    memset(&s->bd_addr, 0, sizeof(bdaddr_t));
+}
+
+static void csrhci_out_tick(void *opaque)
+{
+    csrhci_fifo_wake((struct csrhci_s *) opaque);
+}
+
+static void csrhci_pins(void *opaque, int line, int level)
+{
+    struct csrhci_s *s = (struct csrhci_s *) opaque;
+    int state = s->pin_state;
+
+    s->pin_state &= ~(1 << line);
+    s->pin_state |= (!!level) << line;
+
+    if ((state & ~s->pin_state) & (1 << csrhci_pin_reset)) {
+        /* TODO: Disappear from lower layers */
+        csrhci_reset(s);
+    }
+
+    if (s->pin_state == 3 && state != 3) {
+        s->enable = 1;
+        /* TODO: Wake lower layers up */
+    }
+}
+
+qemu_irq *csrhci_pins_get(CharDriverState *chr)
+{
+    struct csrhci_s *s = (struct csrhci_s *) chr->opaque;
+
+    return s->pins;
+}
+
+CharDriverState *uart_hci_init(qemu_irq wakeup)
+{
+    struct csrhci_s *s = (struct csrhci_s *)
+            qemu_mallocz(sizeof(struct csrhci_s));
+
+    s->chr.opaque = s;
+    s->chr.chr_write = csrhci_write;
+    s->chr.chr_ioctl = csrhci_ioctl;
+
+    s->hci = qemu_next_hci();
+    s->hci->opaque = s;
+    s->hci->evt_recv = csrhci_out_hci_packet_event;
+    s->hci->acl_recv = csrhci_out_hci_packet_acl;
+
+    s->out_tm = qemu_new_timer(vm_clock, csrhci_out_tick, s);
+    s->pins = qemu_allocate_irqs(csrhci_pins, s, __csrhci_pins);
+    csrhci_reset(s);
+
+    return &s->chr;
+}