[PATCH] bluetooth: Add hci_h4p driver

* [PATCH] bluetooth: Add hci_h4p driver
@ 2014-12-23 13:02 ` Pavel Machek
  0 siblings, 0 replies; 40+ messages in thread
From: Pavel Machek @ 2014-12-23 13:02 UTC (permalink / raw)
  To: pavel, pali.rohar, sre, sre, linux-kernel, linux-arm-kernel,
	linux-omap, tony, khilman, aaro.koskinen, ivo.g.dimitrov.75,
	linux-bluetooth, marcel


Add HCI driver for H4 with Nokia extensions. This device is used on
Nokia N900 cell phone.

Older version of this driver lived in staging, before being reverted
in a4102f90e87cfaa3fdbed6fdf469b23f0eeb4bfd .
 
Signed-off-by: Pavel Machek <pavel@ucw.cz>
Thanks-to: Sebastian Reichel <sre@debian.org>
Thanks-to: Joe Perches <joe@perches.com>

---

Please apply,
								Pavel


 Kconfig      |   10 
 Makefile     |    4 
 nokia_core.c | 1149 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 nokia_fw.c   |   99 +++++
 nokia_h4p.h  |  214 ++++++++++
 nokia_uart.c |  171 ++++++++
 7 files changed, 1667 insertions(+)

diff --git a/drivers/bluetooth/Kconfig b/drivers/bluetooth/Kconfig
index 4547dc2..a8b72dd 100644
--- a/drivers/bluetooth/Kconfig
+++ b/drivers/bluetooth/Kconfig
@@ -243,4 +243,14 @@ config BT_WILINK
 	  Say Y here to compile support for Texas Instrument's WiLink7 driver
 	  into the kernel or say M to compile it as module (btwilink).
 
+config BT_NOKIA_H4P
+	tristate "Nokia H4+ Extensions (H4P) driver"
+	help
+	  Bluetooth HCI driver with H4 extensions.  This driver provides
+	  support for H4+ Bluetooth chip with vendor-specific H4 extensions.
+	  It works on Broadcom based chip found in Nokia N900.
+
+	  Say Y here to compile support for h4 extended devices into the kernel
+	  or say M to compile it as module (nokia_h4p).
+
 endmenu
diff --git a/drivers/bluetooth/Makefile b/drivers/bluetooth/Makefile
index 9fe8a87..f1cc580 100644
--- a/drivers/bluetooth/Makefile
+++ b/drivers/bluetooth/Makefile
@@ -31,4 +31,8 @@ hci_uart-$(CONFIG_BT_HCIUART_ATH3K)	+= hci_ath.o
 hci_uart-$(CONFIG_BT_HCIUART_3WIRE)	+= hci_h5.o
 hci_uart-objs				:= $(hci_uart-y)
 
+obj-$(CONFIG_BT_NOKIA_H4P)	+= nokia_h4p.o
+
+nokia_h4p-y			:= nokia_core.o nokia_fw.o nokia_uart.o
+
 ccflags-y += -D__CHECK_ENDIAN__
diff --git a/drivers/bluetooth/nokia_core.c b/drivers/bluetooth/nokia_core.c
new file mode 100644
index 0000000..1316ad2
--- /dev/null
+++ b/drivers/bluetooth/nokia_core.c
@@ -0,0 +1,1149 @@
+/*
+ * This file is part of Nokia H4P bluetooth driver
+ *
+ * Copyright (C) 2005-2008 Nokia Corporation.
+ * Copyright (C) 2014 Pavel Machek <pavel@ucw.cz>
+ *
+ * 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.
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ * Thanks to all the Nokia people that helped with this driver,
+ * including Ville Tervo and Roger Quadros.
+ *
+ * Power saving functionality was removed from this driver to make
+ * merging easier.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/delay.h>
+#include <linux/spinlock.h>
+#include <linux/serial_reg.h>
+#include <linux/skbuff.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/interrupt.h>
+#include <linux/gpio.h>
+#include <linux/of_gpio.h>
+#include <linux/of_irq.h>
+#include <linux/timer.h>
+#include <linux/kthread.h>
+#include <linux/io.h>
+#include <linux/completion.h>
+#include <linux/sizes.h>
+
+#include <net/bluetooth/bluetooth.h>
+#include <net/bluetooth/hci_core.h>
+#include <net/bluetooth/hci.h>
+
+#include "nokia_h4p.h"
+
+/* This should be used in function that cannot release clocks */
+static void h4p_set_clk(struct h4p_info *info, int *clock, bool enable)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&info->clocks_lock, flags);
+	if (enable && !*clock) {
+		BT_DBG("Enabling %p", clock);
+		clk_prepare_enable(info->uart_fclk);
+		clk_prepare_enable(info->uart_iclk);
+		if (atomic_read(&info->clk_users) == 0)
+			h4p_restore_regs(info);
+		atomic_inc(&info->clk_users);
+	}
+
+	if (!enable && *clock) {
+		BT_DBG("Disabling %p", clock);
+		if (atomic_dec_and_test(&info->clk_users))
+			h4p_store_regs(info);
+		clk_disable_unprepare(info->uart_fclk);
+		clk_disable_unprepare(info->uart_iclk);
+	}
+
+	*clock = enable;
+	spin_unlock_irqrestore(&info->clocks_lock, flags);
+}
+
+static void h4p_lazy_clock_release(unsigned long data)
+{
+	struct h4p_info *info = (struct h4p_info *)data;
+	unsigned long flags;
+
+	spin_lock_irqsave(&info->lock, flags);
+	if (!info->tx_enabled)
+		h4p_set_clk(info, &info->tx_clocks_en, false);
+	spin_unlock_irqrestore(&info->lock, flags);
+}
+
+/* Power management functions */
+void h4p_smart_idle(struct h4p_info *info, bool enable)
+{
+	u8 v;
+
+	v = h4p_inb(info, UART_OMAP_SYSC);
+	v &= ~(UART_OMAP_SYSC_IDLEMASK);
+
+	if (enable)
+		v |= UART_OMAP_SYSC_SMART_IDLE;
+	else
+		v |= UART_OMAP_SYSC_NO_IDLE;
+
+	h4p_outb(info, UART_OMAP_SYSC, v);
+}
+
+static inline void h4p_schedule_pm(struct h4p_info *info)
+{
+}
+
+static void h4p_disable_tx(struct h4p_info *info)
+{
+	if (!info->pm_enabled)
+		return;
+
+	/* Re-enable smart-idle */
+	h4p_smart_idle(info, 1);
+
+	gpio_set_value(info->bt_wakeup_gpio, 0);
+	mod_timer(&info->lazy_release, jiffies + msecs_to_jiffies(100));
+	info->tx_enabled = false;
+}
+
+static void h4p_enable_tx_nopm(struct h4p_info *info)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&info->lock, flags);
+	h4p_outb(info, UART_IER,
+		 h4p_inb(info, UART_IER) | UART_IER_THRI);
+	spin_unlock_irqrestore(&info->lock, flags);
+}
+
+void h4p_enable_tx(struct h4p_info *info)
+{
+	unsigned long flags;
+
+	if (!info->pm_enabled)
+		return;
+
+	h4p_schedule_pm(info);
+
+	spin_lock_irqsave(&info->lock, flags);
+	del_timer(&info->lazy_release);
+	h4p_set_clk(info, &info->tx_clocks_en, true);
+	info->tx_enabled = true;
+	gpio_set_value(info->bt_wakeup_gpio, 1);
+	h4p_outb(info, UART_IER,
+		 h4p_inb(info, UART_IER) | UART_IER_THRI);
+
+	/* Disable smart-idle as UART TX interrupts
+	 * are not wake-up capable
+	 */
+	h4p_smart_idle(info, 0);
+
+	spin_unlock_irqrestore(&info->lock, flags);
+}
+
+static void h4p_disable_rx(struct h4p_info *info)
+{
+	if (!info->pm_enabled)
+		return;
+
+	info->rx_enabled = false;
+
+	if (h4p_inb(info, UART_LSR) & UART_LSR_DR)
+		return;
+
+	if (!(h4p_inb(info, UART_LSR) & UART_LSR_TEMT))
+		return;
+
+	__h4p_set_auto_ctsrts(info, 0, UART_EFR_RTS);
+	info->autorts = 0;
+	h4p_set_clk(info, &info->rx_clocks_en, false);
+}
+
+static void h4p_enable_rx(struct h4p_info *info)
+{
+	if (!info->pm_enabled)
+		return;
+
+	h4p_schedule_pm(info);
+
+	h4p_set_clk(info, &info->rx_clocks_en, true);
+	info->rx_enabled = true;
+
+	if (!(h4p_inb(info, UART_LSR) & UART_LSR_TEMT))
+		return;
+
+	__h4p_set_auto_ctsrts(info, 1, UART_EFR_RTS);
+	info->autorts = 1;
+}
+
+static void h4p_simple_send_frame(struct h4p_info *info, struct sk_buff *skb)
+{
+	skb_queue_tail(&info->txq, skb);
+	h4p_enable_tx_nopm(info);
+}
+
+/* Negotiation functions */
+static int h4p_send_alive_packet(struct h4p_info *info)
+{
+	struct h4p_alive_hdr *hdr;
+	struct h4p_alive_pkt *pkt;
+	struct sk_buff *skb;
+	int len;
+
+	BT_DBG("Sending alive packet");
+
+	len = H4_TYPE_SIZE + sizeof(*hdr) + sizeof(*pkt);
+	skb = bt_skb_alloc(len, GFP_KERNEL);
+	if (!skb)
+		return -ENOMEM;
+
+	memset(skb->data, 0x00, len);
+	*skb_put(skb, 1) = H4_ALIVE_PKT;
+	hdr = (struct h4p_alive_hdr *)skb_put(skb, sizeof(*hdr));
+	hdr->dlen = sizeof(*pkt);
+	pkt = (struct h4p_alive_pkt *)skb_put(skb, sizeof(*pkt));
+	pkt->mid = H4P_ALIVE_REQ;
+
+	h4p_simple_send_frame(info, skb);
+
+	BT_DBG("Alive packet sent");
+
+	return 0;
+}
+
+static void h4p_alive_packet(struct h4p_info *info, struct sk_buff *skb)
+{
+	struct h4p_alive_hdr *hdr;
+	struct h4p_alive_pkt *pkt;
+
+	BT_DBG("Received alive packet");
+	hdr = (struct h4p_alive_hdr *)skb->data;
+	if (hdr->dlen != sizeof(*pkt)) {
+		dev_err(info->dev, "Corrupted alive message\n");
+		info->init_error = -EIO;
+		goto finish_alive;
+	}
+
+	pkt = (struct h4p_alive_pkt *)skb_pull(skb, sizeof(*hdr));
+	if (pkt->mid != H4P_ALIVE_RESP) {
+		dev_err(info->dev, "Could not negotiate nokia_h4p settings\n");
+		info->init_error = -EINVAL;
+	}
+
+finish_alive:
+	complete(&info->init_completion);
+	kfree_skb(skb);
+}
+
+static int h4p_send_negotiation(struct h4p_info *info)
+{
+	struct h4p_neg_cmd *neg_cmd;
+	struct h4p_neg_hdr *neg_hdr;
+	struct sk_buff *skb;
+	int err, len;
+	u16 sysclk = 38400;
+
+	BT_DBG("Sending negotiation..");
+	len = sizeof(*neg_cmd) + sizeof(*neg_hdr) + H4_TYPE_SIZE;
+
+	skb = bt_skb_alloc(len, GFP_KERNEL);
+	if (!skb)
+		return -ENOMEM;
+
+	memset(skb->data, 0x00, len);
+	*skb_put(skb, 1) = H4_NEG_PKT;
+	neg_hdr = (struct h4p_neg_hdr *)skb_put(skb, sizeof(*neg_hdr));
+	neg_cmd = (struct h4p_neg_cmd *)skb_put(skb, sizeof(*neg_cmd));
+
+	neg_hdr->dlen = sizeof(*neg_cmd);
+	neg_cmd->ack = H4P_NEG_REQ;
+	neg_cmd->baud = cpu_to_le16(BT_BAUDRATE_DIVIDER/MAX_BAUD_RATE);
+	neg_cmd->proto = H4P_PROTO_BYTE;
+	neg_cmd->sys_clk = cpu_to_le16(sysclk);
+
+	h4p_change_speed(info, INIT_SPEED);
+
+	h4p_set_rts(info, 1);
+	info->init_error = 0;
+	init_completion(&info->init_completion);
+
+	h4p_simple_send_frame(info, skb);
+
+	if (!wait_for_completion_interruptible_timeout(&info->init_completion,
+						       msecs_to_jiffies(1000))) {
+		BT_ERR("h4p: negotiation did not return\n");
+		return -ETIMEDOUT;
+	}
+
+	if (info->init_error < 0)
+		return info->init_error;
+
+	/* Change to operational settings */
+	h4p_set_auto_ctsrts(info, 0, UART_EFR_RTS);
+	h4p_set_rts(info, 0);
+	h4p_change_speed(info, MAX_BAUD_RATE);
+
+	err = h4p_wait_for_cts(info, true, 100);
+	if (err < 0)
+		return err;
+
+	h4p_set_auto_ctsrts(info, 1, UART_EFR_RTS);
+	init_completion(&info->init_completion);
+	err = h4p_send_alive_packet(info);
+	if (err < 0)
+		return err;
+
+	if (!wait_for_completion_interruptible_timeout(&info->init_completion,
+						msecs_to_jiffies(1000)))
+		return -ETIMEDOUT;
+
+	if (info->init_error < 0)
+		return info->init_error;
+
+	BT_DBG("Negotiation successful\n");
+	return 0;
+}
+
+static void h4p_negotiation_packet(struct h4p_info *info, struct sk_buff *skb)
+{
+	struct h4p_neg_hdr *hdr;
+	struct h4p_neg_evt *evt;
+
+	hdr = (struct h4p_neg_hdr *)skb->data;
+	if (hdr->dlen != sizeof(*evt)) {
+		info->init_error = -EIO;
+		goto finish_neg;
+	}
+
+	evt = (struct h4p_neg_evt *)skb_pull(skb, sizeof(*hdr));
+
+	if (evt->ack != H4P_NEG_ACK) {
+		dev_err(info->dev, "Could not negotiate nokia_h4p settings\n");
+		info->init_error = -EINVAL;
+	}
+
+	info->man_id = evt->man_id;
+	info->ver_id = evt->ver_id;
+	BT_DBG("Negotiation finished.\n");
+
+finish_neg:
+	complete(&info->init_completion);
+	kfree_skb(skb);
+}
+
+/* H4 packet handling functions */
+static int h4p_get_hdr_len(struct h4p_info *info, u8 pkt_type)
+{
+	int retval;
+
+	switch (pkt_type) {
+	case H4_EVT_PKT:
+		retval = HCI_EVENT_HDR_SIZE;
+		break;
+	case H4_ACL_PKT:
+		retval = HCI_ACL_HDR_SIZE;
+		break;
+	case H4_SCO_PKT:
+		retval = HCI_SCO_HDR_SIZE;
+		break;
+	case H4_NEG_PKT:
+		retval = H4P_NEG_HDR_SIZE;
+		break;
+	case H4_ALIVE_PKT:
+		retval = H4P_ALIVE_HDR_SIZE;
+		break;
+	case H4_RADIO_PKT:
+		retval = H4_RADIO_HDR_SIZE;
+		break;
+	default:
+		dev_err(info->dev, "Unknown H4 packet type 0x%.2x\n", pkt_type);
+		retval = -1;
+		break;
+	}
+
+	return retval;
+}
+
+static unsigned int
+h4p_get_data_len(struct h4p_info *info, struct sk_buff *skb)
+{
+	struct hci_acl_hdr *acl_hdr;
+	struct hci_sco_hdr *sco_hdr;
+	struct hci_event_hdr *evt_hdr;
+	struct h4p_neg_hdr *neg_hdr;
+	struct h4p_alive_hdr *alive_hdr;
+	struct h4p_radio_hdr *radio_hdr;
+
+	switch (bt_cb(skb)->pkt_type) {
+	case H4_EVT_PKT:
+		evt_hdr = (struct hci_event_hdr *)skb->data;
+		return evt_hdr->plen;
+	case H4_ACL_PKT:
+		acl_hdr = (struct hci_acl_hdr *)skb->data;
+		return le16_to_cpu(acl_hdr->dlen);
+	case H4_SCO_PKT:
+		sco_hdr = (struct hci_sco_hdr *)skb->data;
+		return sco_hdr->dlen;
+	case H4_RADIO_PKT:
+		radio_hdr = (struct h4p_radio_hdr *)skb->data;
+		return radio_hdr->dlen;
+	case H4_NEG_PKT:
+		neg_hdr = (struct h4p_neg_hdr *)skb->data;
+		return neg_hdr->dlen;
+	case H4_ALIVE_PKT:
+		alive_hdr = (struct h4p_alive_hdr *)skb->data;
+		return alive_hdr->dlen;
+	default:
+		return ~0;
+	}
+}
+
+static inline void h4p_recv_frame(struct h4p_info *info, struct sk_buff *skb)
+{
+	if (info->init_phase) {
+		switch (bt_cb(skb)->pkt_type) {
+		case H4_NEG_PKT:
+			h4p_negotiation_packet(info, skb);
+			info->rx_state = WAIT_FOR_PKT_TYPE;
+			return;
+		case H4_ALIVE_PKT:
+			h4p_alive_packet(info, skb);
+			info->rx_state = WAIT_FOR_PKT_TYPE;
+			return;
+		}
+	}
+
+	hci_recv_frame(info->hdev, skb);
+	BT_DBG("Frame sent to upper layer");
+}
+
+static inline void h4p_handle_byte(struct h4p_info *info, u8 byte)
+{
+	switch (info->rx_state) {
+	case WAIT_FOR_PKT_TYPE:
+		bt_cb(info->rx_skb)->pkt_type = byte;
+		info->rx_count = h4p_get_hdr_len(info, byte);
+		if (info->rx_count < 0) {
+			info->hdev->stat.err_rx++;
+			kfree_skb(info->rx_skb);
+			info->rx_skb = NULL;
+		} else {
+			info->rx_state = WAIT_FOR_HEADER;
+		}
+		break;
+	case WAIT_FOR_HEADER:
+		info->rx_count--;
+		*skb_put(info->rx_skb, 1) = byte;
+		if (info->rx_count != 0)
+			break;
+		info->rx_count = h4p_get_data_len(info, info->rx_skb);
+		if (info->rx_count > skb_tailroom(info->rx_skb)) {
+			dev_err(info->dev, "frame too long\n");
+			info->garbage_bytes = info->rx_count
+				- skb_tailroom(info->rx_skb);
+			kfree_skb(info->rx_skb);
+			info->rx_skb = NULL;
+			break;
+		}
+		info->rx_state = WAIT_FOR_DATA;
+		break;
+	case WAIT_FOR_DATA:
+		info->rx_count--;
+		*skb_put(info->rx_skb, 1) = byte;
+		break;
+	default:
+		WARN_ON(1);
+		break;
+	}
+
+	if (info->rx_count == 0) {
+		/* H4+ devices should always send word aligned packets */
+		if (!(info->rx_skb->len % 2))
+			info->garbage_bytes++;
+		h4p_recv_frame(info, info->rx_skb);
+		info->rx_skb = NULL;
+	}
+}
+
+static void h4p_rx_tasklet(unsigned long data)
+{
+	struct h4p_info *info = (struct h4p_info *)data;
+	u8 byte;
+
+	BT_DBG("rx_tasklet woke up");
+
+	while (h4p_inb(info, UART_LSR) & UART_LSR_DR) {
+		byte = h4p_inb(info, UART_RX);
+		BT_DBG("[in: %02x]", byte);
+		if (info->garbage_bytes) {
+			info->garbage_bytes--;
+			continue;
+		}
+		if (!info->rx_skb) {
+			info->rx_skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE,
+						    GFP_ATOMIC | GFP_DMA);
+			if (!info->rx_skb) {
+				dev_err(info->dev,
+					"No memory for new packet\n");
+				goto finish_rx;
+			}
+			info->rx_state = WAIT_FOR_PKT_TYPE;
+			info->rx_skb->dev = (void *)info->hdev;
+		}
+		info->hdev->stat.byte_rx++;
+		h4p_handle_byte(info, byte);
+	}
+
+	if (!info->rx_enabled) {
+		if ((h4p_inb(info, UART_LSR) & UART_LSR_TEMT) &&
+		    info->autorts) {
+			__h4p_set_auto_ctsrts(info, 0 , UART_EFR_RTS);
+			info->autorts = 0;
+		}
+		/* Flush posted write to avoid spurious interrupts */
+		h4p_inb(info, UART_OMAP_SCR);
+		h4p_set_clk(info, &info->rx_clocks_en, false);
+	}
+
+finish_rx:
+	BT_DBG("rx_ended");
+}
+
+static void h4p_tx_tasklet(unsigned long data)
+{
+	struct h4p_info *info = (struct h4p_info *)data;
+	struct sk_buff *skb;
+	unsigned int sent = 0;
+
+	BT_DBG("tx_tasklet woke up");
+
+	if (info->autorts != info->rx_enabled) {
+		if (h4p_inb(info, UART_LSR) & UART_LSR_TEMT) {
+			if (info->autorts && !info->rx_enabled) {
+				__h4p_set_auto_ctsrts(info, 0,
+						      UART_EFR_RTS);
+				info->autorts = 0;
+			}
+			if (!info->autorts && info->rx_enabled) {
+				__h4p_set_auto_ctsrts(info, 1,
+						      UART_EFR_RTS);
+				info->autorts = 1;
+			}
+		} else {
+			h4p_outb(info, UART_OMAP_SCR,
+				 h4p_inb(info, UART_OMAP_SCR)
+				 | UART_OMAP_SCR_EMPTY_THR);
+			goto finish_tx;
+		}
+	}
+
+	skb = skb_dequeue(&info->txq);
+	if (!skb) {
+		/* No data in buffer */
+		BT_DBG("skb ready");
+		if (h4p_inb(info, UART_LSR) & UART_LSR_TEMT) {
+			h4p_outb(info, UART_IER,
+				 h4p_inb(info, UART_IER) & ~UART_IER_THRI);
+			h4p_inb(info, UART_OMAP_SCR);
+			h4p_disable_tx(info);
+			return;
+		}
+		h4p_outb(info, UART_OMAP_SCR,
+			     h4p_inb(info, UART_OMAP_SCR) |
+			     UART_OMAP_SCR_EMPTY_THR);
+		goto finish_tx;
+	}
+
+	/* Copy data to tx fifo */
+	while (!(h4p_inb(info, UART_OMAP_SSR) & UART_OMAP_SSR_TXFULL) &&
+	       (sent < skb->len)) {
+		BT_DBG("%02x ", skb->data[sent]);
+		h4p_outb(info, UART_TX, skb->data[sent]);
+		sent++;
+	}
+
+	info->hdev->stat.byte_tx += sent;
+	if (skb->len == sent) {
+		kfree_skb(skb);
+	} else {
+		skb_pull(skb, sent);
+		skb_queue_head(&info->txq, skb);
+	}
+
+	h4p_outb(info, UART_OMAP_SCR,
+		 h4p_inb(info, UART_OMAP_SCR) & ~UART_OMAP_SCR_EMPTY_THR);
+	h4p_outb(info, UART_IER,
+		 h4p_inb(info, UART_IER) | UART_IER_THRI);
+
+finish_tx:
+	/* Flush posted write to avoid spurious interrupts */
+	h4p_inb(info, UART_OMAP_SCR);
+
+}
+
+static irqreturn_t h4p_interrupt(int irq, void *data)
+{
+	struct h4p_info *info = (struct h4p_info *)data;
+	u8 iir, msr;
+	int ret;
+
+	ret = IRQ_NONE;
+
+	iir = h4p_inb(info, UART_IIR);
+	if (iir & UART_IIR_NO_INT)
+		return IRQ_HANDLED;
+
+	iir &= UART_IIR_ID;
+
+	if (iir == UART_IIR_MSI) {
+		msr = h4p_inb(info, UART_MSR);
+		ret = IRQ_HANDLED;
+	}
+	if (iir == UART_IIR_RLSI) {
+		h4p_inb(info, UART_RX);
+		h4p_inb(info, UART_LSR);
+		ret = IRQ_HANDLED;
+	}
+
+	if (iir == UART_IIR_RDI) {
+		h4p_rx_tasklet((unsigned long)data);
+		ret = IRQ_HANDLED;
+	}
+
+	if (iir == UART_IIR_THRI) {
+		h4p_tx_tasklet((unsigned long)data);
+		ret = IRQ_HANDLED;
+	}
+
+	return ret;
+}
+
+static irqreturn_t h4p_wakeup_interrupt(int irq, void *dev_inst)
+{
+	struct h4p_info *info = dev_inst;
+	bool should_wakeup;
+
+	BT_DBG("[wakeup irq]");
+
+	if (!info->hdev)
+		return IRQ_HANDLED;
+
+	should_wakeup = !!gpio_get_value(info->host_wakeup_gpio);
+
+	if (info->init_phase) {
+		if (should_wakeup == 1)
+			complete_all(&info->test_completion);
+
+		BT_DBG("wakeup irq handled");
+
+		return IRQ_HANDLED;
+	}
+
+	BT_DBG("gpio interrupt %d", should_wakeup);
+
+	/* Check if we have missed some interrupts */
+	if (info->rx_enabled == should_wakeup)
+		return IRQ_HANDLED;
+
+	if (should_wakeup)
+		h4p_enable_rx(info);
+	else
+		h4p_disable_rx(info);
+
+	return IRQ_HANDLED;
+}
+
+static int h4p_reset(struct h4p_info *info)
+{
+	int err;
+
+	err = h4p_reset_uart(info);
+	if (err < 0) {
+		dev_err(info->dev, "Uart reset failed\n");
+		return err;
+	}
+	h4p_init_uart(info);
+	h4p_set_rts(info, 0);
+
+	gpio_set_value(info->reset_gpio, 0);
+	gpio_set_value(info->bt_wakeup_gpio, 1);
+	msleep(10);
+
+	if (gpio_get_value(info->host_wakeup_gpio) == 1) {
+		dev_err(info->dev, "host_wakeup_gpio not low\n");
+		return -EPROTO;
+	}
+
+	init_completion(&info->test_completion);
+	gpio_set_value(info->reset_gpio, 1);
+
+	if (!wait_for_completion_interruptible_timeout(&info->test_completion,
+						       msecs_to_jiffies(100))) {
+		dev_err(info->dev, "wakeup test timed out\n");
+		complete_all(&info->test_completion);
+		return -EPROTO;
+	}
+
+	err = h4p_wait_for_cts(info, true, 100);
+	if (err < 0) {
+		dev_err(info->dev, "No cts from bt chip\n");
+		return err;
+	}
+
+	h4p_set_rts(info, 1);
+
+	return 0;
+}
+
+/* hci callback functions */
+static int h4p_hci_flush(struct hci_dev *hdev)
+{
+	struct h4p_info *info = hci_get_drvdata(hdev);
+
+	skb_queue_purge(&info->txq);
+
+	return 0;
+}
+
+static int h4p_bt_wakeup_test(struct h4p_info *info)
+{
+	/*
+	 * Test Sequence:
+	 * Host de-asserts the BT_WAKE_UP line.
+	 * Host polls the UART_CTS line, waiting for it to be de-asserted.
+	 * Host asserts the BT_WAKE_UP line.
+	 * Host polls the UART_CTS line, waiting for it to be asserted.
+	 * Host de-asserts the BT_WAKE_UP line (allow the Bluetooth device to
+	 * sleep).
+	 * Host polls the UART_CTS line, waiting for it to be de-asserted.
+	 */
+	int err = 0;
+
+	if (!info)
+		return -EINVAL;
+
+	/* Disable wakeup interrupts */
+	disable_irq(gpio_to_irq(info->host_wakeup_gpio));
+
+	gpio_set_value(info->bt_wakeup_gpio, 0);
+	err = h4p_wait_for_cts(info, false, 100);
+	if (err) {
+		dev_warn(info->dev,
+			 "bt_wakeup_test: fail: CTS low timed out: %d\n", err);
+		goto out;
+	}
+
+	gpio_set_value(info->bt_wakeup_gpio, 1);
+	err = h4p_wait_for_cts(info, true, 100);
+	if (err) {
+		dev_warn(info->dev,
+			 "bt_wakeup_test: fail: CTS high timed out: %d\n",
+			 err);
+		goto out;
+	}
+
+	gpio_set_value(info->bt_wakeup_gpio, 0);
+	err = h4p_wait_for_cts(info, false, 100);
+	if (err) {
+		dev_warn(info->dev,
+			 "bt_wakeup_test: fail: CTS re-low timed out: %d\n",
+			 err);
+		goto out;
+	}
+
+out:
+	/* Re-enable wakeup interrupts */
+	enable_irq(gpio_to_irq(info->host_wakeup_gpio));
+
+	return err;
+}
+
+static int h4p_hci_set_bdaddr(struct hci_dev *hdev, const bdaddr_t *bdaddr)
+{
+	struct sk_buff *skb;
+	long ret;
+
+	BT_DBG("Set bdaddr... %pMR", bdaddr);
+
+	skb = __hci_cmd_sync(hdev, 0xfc01, 6, bdaddr, HCI_INIT_TIMEOUT);
+	if (IS_ERR(skb)) {
+		ret = PTR_ERR(skb);
+		BT_ERR("%s: BCM: Change address command failed (%ld)",
+		       hdev->name, ret);
+		return ret;
+	}
+	kfree_skb(skb);
+
+	return 0;
+}
+
+static void h4p_deinit(struct hci_dev *hdev)
+{
+	struct h4p_info *info = hci_get_drvdata(hdev);
+
+	h4p_hci_flush(hdev);
+	h4p_set_clk(info, &info->tx_clocks_en, true);
+	h4p_set_clk(info, &info->rx_clocks_en, true);
+	h4p_reset_uart(info);
+	del_timer_sync(&info->lazy_release);
+	h4p_set_clk(info, &info->tx_clocks_en, false);
+	h4p_set_clk(info, &info->rx_clocks_en, false);
+	gpio_set_value(info->reset_gpio, 0);
+	gpio_set_value(info->bt_wakeup_gpio, 0);
+	kfree_skb(info->rx_skb);
+	info->rx_skb = NULL;
+}
+
+static int h4p_hci_setup(struct hci_dev *hdev)
+{
+	struct h4p_info *info = hci_get_drvdata(hdev);
+	int err;
+	unsigned long flags;
+
+	h4p_set_clk(info, &info->tx_clocks_en, true);
+	h4p_set_clk(info, &info->rx_clocks_en, true);
+
+	h4p_set_auto_ctsrts(info, 1, UART_EFR_CTS | UART_EFR_RTS);
+	info->autorts = 1;
+
+	info->init_phase = true;
+	BT_DBG("hci_setup");
+
+	err = h4p_send_negotiation(info);
+	if (err < 0)
+		goto err_clean;
+
+	/* Disable smart-idle as UART TX interrupts
+	 * are not wake-up capable
+	 */
+	h4p_smart_idle(info, 0);
+
+	err = h4p_read_fw(info);
+	if (err < 0) {
+		dev_err(info->dev, "Cannot read firmware\n");
+		goto err_clean;
+	}
+
+	h4p_set_auto_ctsrts(info, 0, UART_EFR_RTS);
+	h4p_set_rts(info, 0);
+	h4p_change_speed(info, BC4_MAX_BAUD_RATE);
+	h4p_set_auto_ctsrts(info, 1, UART_EFR_RTS);
+
+	info->pm_enabled = true;
+
+	err = h4p_bt_wakeup_test(info);
+	if (err < 0) {
+		dev_err(info->dev, "BT wakeup test failed.\n");
+		goto err_clean;
+	}
+
+	spin_lock_irqsave(&info->lock, flags);
+	info->rx_enabled = !!gpio_get_value(info->host_wakeup_gpio);
+	h4p_set_clk(info, &info->rx_clocks_en, info->rx_enabled);
+	spin_unlock_irqrestore(&info->lock, flags);
+
+	h4p_set_clk(info, &info->tx_clocks_en, 0);
+
+	info->init_phase = false;
+	return 0;
+
+err_clean:
+	BT_ERR("hci_setup: something failed, should do the clean up");
+	h4p_hci_flush(hdev);
+	h4p_deinit(hdev);
+	return err;
+}
+
+static int h4p_boot(struct hci_dev *hdev)
+{
+	struct h4p_info *info = hci_get_drvdata(hdev);
+	int err;
+
+	info->rx_enabled = 1;
+	info->rx_state = WAIT_FOR_PKT_TYPE;
+	info->rx_count = 0;
+	info->garbage_bytes = 0;
+	info->rx_skb = NULL;
+	info->pm_enabled = false;
+	init_completion(&info->fw_completion);
+	h4p_set_clk(info, &info->tx_clocks_en, 1);
+	h4p_set_clk(info, &info->rx_clocks_en, 1);
+
+	err = h4p_reset(info);
+	return err;
+}
+
+static int h4p_hci_open(struct hci_dev *hdev)
+{
+	set_bit(HCI_RUNNING, &hdev->flags);
+	return 0;
+}
+
+static int h4p_hci_close(struct hci_dev *hdev)
+{
+	clear_bit(HCI_RUNNING, &hdev->flags);
+	return 0;
+}
+
+static int h4p_hci_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
+{
+	struct h4p_info *info = hci_get_drvdata(hdev);
+	int err = 0;
+
+	BT_DBG("hci_send_frame: dev %p, skb %p", hdev, skb);
+
+	if (!test_bit(HCI_RUNNING, &hdev->flags))
+		return -EBUSY;
+
+	switch (bt_cb(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;
+	}
+
+	/* Push frame type to skb */
+	*skb_push(skb, 1) = bt_cb(skb)->pkt_type;
+	/* We should always send word aligned data to h4+ devices */
+	if (skb->len % 2) {
+		if (skb_pad(skb, 1))
+			return -ENOMEM;
+		*skb_put(skb, 1) = 0x00;
+	}
+	if (err)
+		return err;
+
+	skb_queue_tail(&info->txq, skb);
+	if (!info->init_phase)
+		h4p_enable_tx(info);
+	else
+		h4p_enable_tx_nopm(info);
+
+	return 0;
+}
+
+static int h4p_probe_dt(struct platform_device *pdev, struct h4p_info *info)
+{
+	struct device_node *node;
+	struct device_node *uart = pdev->dev.of_node;
+	u32 val;
+	struct resource *mem;
+
+	node = of_get_child_by_name(uart, "device");
+
+	if (!node)
+		return -ENODATA;
+
+	info->chip_type = 3;	/* Bcm2048 */
+
+	if (of_property_read_u32(node, "bt-sysclk", &val))
+		return -EINVAL;
+	info->bt_sysclk = val;
+
+	info->reset_gpio       = of_get_named_gpio(node, "reset-gpios", 0);
+	info->host_wakeup_gpio = of_get_named_gpio(node, "host-wakeup-gpios", 0);
+	info->bt_wakeup_gpio   = of_get_named_gpio(node, "bluetooth-wakeup-gpios", 0);
+
+	if (!uart) {
+		dev_err(&pdev->dev, "UART link not provided\n");
+		return -EINVAL;
+	}
+
+	info->irq = irq_of_parse_and_map(uart, 0);
+
+	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	info->uart_base = devm_ioremap_resource(&pdev->dev, mem);
+
+	info->uart_iclk = of_clk_get_by_name(uart, "ick");
+	info->uart_fclk = of_clk_get_by_name(uart, "fck");
+
+	BT_DBG("DT: have neccessary data");
+	return 0;
+}
+
+static int h4p_probe(struct platform_device *pdev)
+{
+	struct hci_dev *hdev;
+	struct h4p_info *info;
+	int err;
+
+	dev_info(&pdev->dev, "Registering HCI H4P device\n");
+	info = devm_kzalloc(&pdev->dev, sizeof(struct h4p_info),
+			    GFP_KERNEL);
+	if (!info)
+		return -ENOMEM;
+
+	info->dev = &pdev->dev;
+	info->tx_enabled = true;
+	info->rx_enabled = true;
+	spin_lock_init(&info->lock);
+	spin_lock_init(&info->clocks_lock);
+	skb_queue_head_init(&info->txq);
+
+	err = h4p_probe_dt(pdev, info);
+	if (err) {
+		dev_err(&pdev->dev, "Could not get Bluetooth config data\n");
+		return -ENODATA;
+	}
+
+	BT_DBG("base/irq gpio: %p/%d",
+	       info->uart_base, info->irq);
+	BT_DBG("RESET/BTWU/HOSTWU gpio: %d/%d/%d",
+	       info->reset_gpio, info->bt_wakeup_gpio, info->host_wakeup_gpio);
+	BT_DBG("chip type, sysclk: %d/%d", info->chip_type, info->bt_sysclk);
+	BT_DBG("clock i/f: %p/%p", info->uart_iclk, info->uart_fclk);
+
+	init_completion(&info->test_completion);
+	complete_all(&info->test_completion);
+
+	err = devm_gpio_request_one(&pdev->dev, info->reset_gpio,
+				    GPIOF_OUT_INIT_LOW, "bt_reset");
+	if (err < 0) {
+		dev_err(&pdev->dev, "Cannot get GPIO line %d\n",
+			info->reset_gpio);
+		return err;
+	}
+
+	err = devm_gpio_request_one(&pdev->dev, info->bt_wakeup_gpio,
+				    GPIOF_OUT_INIT_LOW, "bt_wakeup");
+	if (err < 0) {
+		dev_err(info->dev, "Cannot get GPIO line 0x%d",
+			info->bt_wakeup_gpio);
+		return err;
+	}
+
+	err = devm_gpio_request_one(&pdev->dev, info->host_wakeup_gpio,
+				    GPIOF_DIR_IN, "host_wakeup");
+	if (err < 0) {
+		dev_err(info->dev, "Cannot get GPIO line %d",
+		       info->host_wakeup_gpio);
+		return err;
+	}
+
+	err = devm_request_irq(&pdev->dev, info->irq, h4p_interrupt,
+				IRQF_DISABLED, "nokia_h4p", info);
+	if (err < 0) {
+		dev_err(info->dev, "nokia_h4p: unable to get IRQ %d\n",
+			info->irq);
+		return err;
+	}
+
+	err = devm_request_irq(&pdev->dev, gpio_to_irq(info->host_wakeup_gpio),
+			       h4p_wakeup_interrupt,  IRQF_TRIGGER_FALLING |
+			       IRQF_TRIGGER_RISING | IRQF_DISABLED,
+			       "h4p_wkup", info);
+	if (err < 0) {
+		dev_err(info->dev, "nokia_h4p: unable to get wakeup IRQ %d\n",
+			gpio_to_irq(info->host_wakeup_gpio));
+		return err;
+	}
+
+	err = irq_set_irq_wake(gpio_to_irq(info->host_wakeup_gpio), 1);
+	if (err < 0) {
+		dev_err(info->dev, "nokia_h4p: unable to set wakeup for IRQ %d\n",
+			gpio_to_irq(info->host_wakeup_gpio));
+		return err;
+	}
+
+	init_timer_deferrable(&info->lazy_release);
+	info->lazy_release.function = h4p_lazy_clock_release;
+	info->lazy_release.data = (unsigned long)info;
+	h4p_set_clk(info, &info->tx_clocks_en, 1);
+
+	err = h4p_reset_uart(info);
+	if (err < 0)
+		return err;
+
+	gpio_set_value(info->reset_gpio, 0);
+	h4p_set_clk(info, &info->tx_clocks_en, 0);
+
+	platform_set_drvdata(pdev, info);
+
+	/* Initialize and register HCI device */
+
+	hdev = hci_alloc_dev();
+	if (!hdev) {
+		dev_err(info->dev, "Can't allocate memory for device\n");
+		return -ENOMEM;
+	}
+	info->hdev = hdev;
+
+	hdev->bus = HCI_UART;
+	hci_set_drvdata(hdev, info);
+
+	hdev->open = h4p_hci_open;
+	hdev->setup = h4p_hci_setup;
+	hdev->close = h4p_hci_close;
+	hdev->flush = h4p_hci_flush;
+	hdev->send = h4p_hci_send_frame;
+	hdev->set_bdaddr = h4p_hci_set_bdaddr;
+
+	set_bit(HCI_QUIRK_INVALID_BDADDR, &hdev->quirks);
+	SET_HCIDEV_DEV(hdev, info->dev);
+
+	if (hci_register_dev(hdev) < 0)
+		goto err;
+	return h4p_boot(hdev);
+
+err:
+	dev_err(info->dev, "hci_register failed %s.\n", hdev->name);
+	hci_free_dev(info->hdev);
+	return -ENODEV;
+}
+
+static int h4p_remove(struct platform_device *pdev)
+{
+	struct h4p_info *info = platform_get_drvdata(pdev);
+
+	h4p_hci_close(info->hdev);
+	h4p_deinit(info->hdev);
+	hci_unregister_dev(info->hdev);
+	hci_free_dev(info->hdev);
+
+	return 0;
+}
+
+static const struct of_device_id h4p_of_match[] = {
+	{ .compatible = "brcm,uart,bcm2048" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, h4p_of_match);
+
+static struct platform_driver h4p_driver = {
+	.probe		= h4p_probe,
+	.remove		= h4p_remove,
+	.driver		= {
+		.name	= "nokia_h4p",
+		.owner  = THIS_MODULE,
+		.of_match_table = of_match_ptr(h4p_of_match),
+	},
+};
+
+module_platform_driver(h4p_driver);
+
+MODULE_ALIAS("platform:nokia_h4p");
+MODULE_DESCRIPTION("Bluetooth H4 driver with nokia extensions");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Ville Tervo");
diff --git a/drivers/bluetooth/nokia_fw.c b/drivers/bluetooth/nokia_fw.c
new file mode 100644
index 0000000..4e910db
--- /dev/null
+++ b/drivers/bluetooth/nokia_fw.c
@@ -0,0 +1,99 @@
+/*
+ * This file is part of nokia_h4p bluetooth driver
+ *
+ * Copyright (C) 2005-2008 Nokia Corporation.
+ * Copyright (C) 2014 Pavel Machek <pavel@ucw.cz>
+ *
+ * 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.
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/firmware.h>
+#include <linux/clk.h>
+
+#include <net/bluetooth/bluetooth.h>
+
+#include "nokia_h4p.h"
+
+#define FW_NAME_BCM2048		"nokia/bcmfw.bin"
+
+/* Read fw. Return length of the command. If no more commands in
+ * fw 0 is returned. In error case return value is negative.
+ */
+int h4p_read_fw(struct h4p_info *info)
+{
+	int num = 0;
+	int fw_pos = 0;
+	struct sk_buff *skb;
+	const struct firmware *fw_entry = NULL;
+	int err = -ENOENT;
+	unsigned int cmd_len = 0;
+
+	err = request_firmware(&fw_entry, FW_NAME_BCM2048, info->dev);
+	if (err != 0)
+		return err;
+
+	while (1) {
+		int cmd, len;
+
+		fw_pos += cmd_len;
+
+		if (fw_pos >= fw_entry->size)
+			break;
+
+		if (fw_pos + 2 > fw_entry->size) {
+			dev_err(info->dev, "Corrupted firmware image\n");
+			err = -EMSGSIZE;
+			break;
+		}
+
+		cmd_len = fw_entry->data[fw_pos++];
+		cmd_len += fw_entry->data[fw_pos++] << 8;
+		if (cmd_len == 0)
+			break;
+
+		if (fw_pos + cmd_len > fw_entry->size) {
+			dev_err(info->dev, "Corrupted firmware image\n");
+			err = -EMSGSIZE;
+			break;
+		}
+
+		/* Skip first two packets */
+		if (++num <= 2)
+			continue;
+
+		/* Note that this is timing-critical. If sending packets takes too
+		 * long, initialization will fail.
+		 */
+		cmd = fw_entry->data[fw_pos+1];
+		cmd += fw_entry->data[fw_pos+2] << 8;
+		len = fw_entry->data[fw_pos+3];
+
+		skb = __hci_cmd_sync(info->hdev, cmd, len, fw_entry->data+fw_pos+4, 500);
+		if (IS_ERR(skb)) {
+			dev_err(info->dev, "...sending cmd %x len %d failed %ld\n",
+				cmd, len, PTR_ERR(skb));
+			err = -EIO;
+			break;
+		}
+	}
+
+	release_firmware(fw_entry);
+	return err;
+}
+
+MODULE_FIRMWARE(FW_NAME_BCM2048);
diff --git a/drivers/bluetooth/nokia_h4p.h b/drivers/bluetooth/nokia_h4p.h
new file mode 100644
index 0000000..110123d
--- /dev/null
+++ b/drivers/bluetooth/nokia_h4p.h
@@ -0,0 +1,214 @@
+/*
+ * This file is part of Nokia H4P bluetooth driver
+ *
+ * Copyright (C) 2005-2008 Nokia Corporation.
+ *
+ * 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.
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+#include <net/bluetooth/bluetooth.h>
+#include <net/bluetooth/hci_core.h>
+#include <net/bluetooth/hci.h>
+
+#include <linux/serial_reg.h>
+
+#define UART_SYSC_OMAP_RESET	0x03
+#define UART_SYSS_RESETDONE	0x01
+#define UART_OMAP_SCR_EMPTY_THR	0x08
+#define UART_OMAP_SCR_WAKEUP	0x10
+#define UART_OMAP_SSR_WAKEUP	0x02
+#define UART_OMAP_SSR_TXFULL	0x01
+
+#define UART_OMAP_SYSC_IDLEMODE		0x03
+#define UART_OMAP_SYSC_IDLEMASK		(3 << UART_OMAP_SYSC_IDLEMODE)
+
+#define UART_OMAP_SYSC_FORCE_IDLE	(0 << UART_OMAP_SYSC_IDLEMODE)
+#define UART_OMAP_SYSC_NO_IDLE		(1 << UART_OMAP_SYSC_IDLEMODE)
+#define UART_OMAP_SYSC_SMART_IDLE	(2 << UART_OMAP_SYSC_IDLEMODE)
+
+#define H4P_TRANSFER_MODE		1
+#define H4P_SCHED_TRANSFER_MODE		2
+#define H4P_ACTIVE_MODE			3
+
+struct h4p_info {
+	struct timer_list lazy_release;
+	struct hci_dev *hdev;
+	spinlock_t lock;
+
+	void __iomem *uart_base;
+	unsigned long uart_phys_base;
+	int irq;
+	struct device *dev;
+	u8 chip_type;
+	u8 bt_wakeup_gpio;
+	u8 host_wakeup_gpio;
+	u8 reset_gpio;
+	u8 reset_gpio_shared;
+	u8 bt_sysclk;
+	u8 man_id;
+	u8 ver_id;
+
+	struct sk_buff_head fw_queue;
+	struct sk_buff *alive_cmd_skb;
+	struct completion init_completion;
+	struct completion fw_completion;
+	struct completion test_completion;
+	int fw_error;
+	int init_error;
+
+	struct sk_buff_head txq;
+
+	struct sk_buff *rx_skb;
+	int rx_count;
+	unsigned int rx_state;
+	unsigned int garbage_bytes;
+
+	struct sk_buff_head *fw_q;
+
+	bool pm_enabled;
+	bool tx_enabled;
+	int autorts;
+	bool rx_enabled;
+	unsigned long pm_flags;
+
+	int tx_clocks_en;
+	int rx_clocks_en;
+	spinlock_t clocks_lock;
+	struct clk *uart_iclk;
+	struct clk *uart_fclk;
+	atomic_t clk_users;
+	u16 dll;
+	u16 dlh;
+	u16 ier;
+	u16 mdr1;
+	u16 efr;
+
+	bool init_phase;
+};
+
+struct h4p_radio_hdr {
+	u8 evt;
+	u8 dlen;
+} __packed;
+
+struct h4p_neg_hdr {
+	u8 dlen;
+} __packed;
+#define H4P_NEG_HDR_SIZE 1
+
+#define H4P_NEG_REQ	0x00
+#define H4P_NEG_ACK	0x20
+#define H4P_NEG_NAK	0x40
+
+#define H4P_PROTO_PKT	0x44
+#define H4P_PROTO_BYTE	0x4c
+
+#define H4P_ID_BCM2048	0x04
+
+struct h4p_neg_cmd {
+	u8	ack;
+	__le16	baud;
+	u16	unused1;
+	u8	proto;
+	__le16	sys_clk;
+	u16	unused2;
+} __packed;
+
+struct h4p_neg_evt {
+	u8	ack;
+	__le16	baud;
+	__le16	unused1;
+	u8	proto;
+	__le16	sys_clk;
+	u16	unused2;
+	u8	man_id;
+	u8	ver_id;
+} __packed;
+
+#define H4P_ALIVE_REQ	0x55
+#define H4P_ALIVE_RESP	0xcc
+
+struct h4p_alive_hdr {
+	u8	dlen;
+} __packed;
+#define H4P_ALIVE_HDR_SIZE 1
+
+struct h4p_alive_pkt {
+	u8	mid;
+	u8	unused;
+} __packed;
+
+#define MAX_BAUD_RATE		921600
+#define BC4_MAX_BAUD_RATE	3692300
+#define UART_CLOCK		48000000
+#define BT_INIT_DIVIDER		320
+#define BT_BAUDRATE_DIVIDER	384000000
+#define BT_SYSCLK_DIV		1000
+#define INIT_SPEED		120000
+
+#define H4_TYPE_SIZE		1
+#define H4_RADIO_HDR_SIZE	2
+
+/* H4+ packet types */
+#define H4_CMD_PKT		0x01
+#define H4_ACL_PKT		0x02
+#define H4_SCO_PKT		0x03
+#define H4_EVT_PKT		0x04
+#define H4_NEG_PKT		0x06
+#define H4_ALIVE_PKT		0x07
+#define H4_RADIO_PKT		0x08
+
+/* TX states */
+#define WAIT_FOR_PKT_TYPE	1
+#define WAIT_FOR_HEADER		2
+#define WAIT_FOR_DATA		3
+
+int h4p_read_fw(struct h4p_info *info);
+
+static inline void h4p_outb(struct h4p_info *info, unsigned int offset, u8 val)
+{
+	__raw_writeb(val, info->uart_base + (offset << 2));
+}
+
+static inline u8 h4p_inb(struct h4p_info *info, unsigned int offset)
+{
+	u8 val;
+	val = __raw_readb(info->uart_base + (offset << 2));
+	return val;
+}
+
+static inline void h4p_set_rts(struct h4p_info *info, int active)
+{
+	u8 b;
+
+	b = h4p_inb(info, UART_MCR);
+	if (active)
+		b |= UART_MCR_RTS;
+	else
+		b &= ~UART_MCR_RTS;
+	h4p_outb(info, UART_MCR, b);
+}
+
+int h4p_wait_for_cts(struct h4p_info *info, bool active, int timeout_ms);
+void __h4p_set_auto_ctsrts(struct h4p_info *info, bool on, u8 which);
+void h4p_set_auto_ctsrts(struct h4p_info *info, bool on, u8 which);
+void h4p_change_speed(struct h4p_info *info, unsigned long speed);
+int h4p_reset_uart(struct h4p_info *info);
+void h4p_init_uart(struct h4p_info *info);
+void h4p_enable_tx(struct h4p_info *info);
+void h4p_store_regs(struct h4p_info *info);
+void h4p_restore_regs(struct h4p_info *info);
+void h4p_smart_idle(struct h4p_info *info, bool enable);
diff --git a/drivers/bluetooth/nokia_uart.c b/drivers/bluetooth/nokia_uart.c
new file mode 100644
index 0000000..3a27793
--- /dev/null
+++ b/drivers/bluetooth/nokia_uart.c
@@ -0,0 +1,171 @@
+/*
+ * This file is part of Nokia H4P bluetooth driver
+ *
+ * Copyright (C) 2005, 2006 Nokia Corporation.
+ * Copyright (C) 2014 Pavel Machek <pavel@ucw.cz>
+ *
+ * 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.
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+#include <linux/delay.h>
+#include <linux/clk.h>
+
+#include <linux/io.h>
+
+#include "nokia_h4p.h"
+
+int h4p_wait_for_cts(struct h4p_info *info, bool active, int timeout_ms)
+{
+	unsigned long timeout;
+	int state;
+
+	timeout = jiffies + msecs_to_jiffies(timeout_ms);
+	for (;;) {
+		state = h4p_inb(info, UART_MSR) & UART_MSR_CTS;
+		if (active == !!state)
+			return 0;
+		if (time_after(jiffies, timeout))
+			return -ETIMEDOUT;
+		msleep(1);
+	}
+}
+
+void __h4p_set_auto_ctsrts(struct h4p_info *info, bool on, u8 which)
+{
+	u8 lcr, b;
+
+	lcr = h4p_inb(info, UART_LCR);
+	h4p_outb(info, UART_LCR, 0xbf);
+	b = h4p_inb(info, UART_EFR);
+	if (on)
+		b |= which;
+	else
+		b &= ~which;
+	h4p_outb(info, UART_EFR, b);
+	h4p_outb(info, UART_LCR, lcr);
+}
+
+void h4p_set_auto_ctsrts(struct h4p_info *info, bool on, u8 which)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&info->lock, flags);
+	__h4p_set_auto_ctsrts(info, on, which);
+	spin_unlock_irqrestore(&info->lock, flags);
+}
+
+void h4p_change_speed(struct h4p_info *info, unsigned long speed)
+{
+	unsigned int divisor;
+	u8 lcr, mdr1;
+
+	BT_DBG("Setting speed %lu", speed);
+
+	if (speed >= 460800) {
+		divisor = UART_CLOCK / 13 / speed;
+		mdr1 = 3;
+	} else {
+		divisor = UART_CLOCK / 16 / speed;
+		mdr1 = 0;
+	}
+
+	/* Make sure UART mode is disabled */
+	h4p_outb(info, UART_OMAP_MDR1, 7);
+
+	lcr = h4p_inb(info, UART_LCR);
+	h4p_outb(info, UART_LCR, UART_LCR_DLAB);     /* Set DLAB */
+	h4p_outb(info, UART_DLL, divisor & 0xff);    /* Set speed */
+	h4p_outb(info, UART_DLM, divisor >> 8);
+	h4p_outb(info, UART_LCR, lcr);
+
+	/* Make sure UART mode is enabled */
+	h4p_outb(info, UART_OMAP_MDR1, mdr1);
+}
+
+int h4p_reset_uart(struct h4p_info *info)
+{
+	int count = 0;
+
+	/* Reset the UART */
+	h4p_outb(info, UART_OMAP_SYSC, UART_SYSC_OMAP_RESET);
+	while (!(h4p_inb(info, UART_OMAP_SYSS) & UART_SYSS_RESETDONE)) {
+		if (count++ > 100) {
+			dev_err(info->dev, "nokia_h4p: UART reset timeout\n");
+			return -ENODEV;
+		}
+		udelay(1);
+	}
+
+	return 0;
+}
+
+void h4p_store_regs(struct h4p_info *info)
+{
+	u16 lcr = 0;
+
+	lcr = h4p_inb(info, UART_LCR);
+	h4p_outb(info, UART_LCR, 0xBF);
+	info->dll = h4p_inb(info, UART_DLL);
+	info->dlh = h4p_inb(info, UART_DLM);
+	info->efr = h4p_inb(info, UART_EFR);
+	h4p_outb(info, UART_LCR, lcr);
+	info->mdr1 = h4p_inb(info, UART_OMAP_MDR1);
+	info->ier = h4p_inb(info, UART_IER);
+}
+
+void h4p_restore_regs(struct h4p_info *info)
+{
+	u16 lcr = 0;
+
+	h4p_init_uart(info);
+
+	h4p_outb(info, UART_OMAP_MDR1, 7);
+	lcr = h4p_inb(info, UART_LCR);
+	h4p_outb(info, UART_LCR, 0xBF);
+	h4p_outb(info, UART_DLL, info->dll);    /* Set speed */
+	h4p_outb(info, UART_DLM, info->dlh);
+	h4p_outb(info, UART_EFR, info->efr);
+	h4p_outb(info, UART_LCR, lcr);
+	h4p_outb(info, UART_OMAP_MDR1, info->mdr1);
+	h4p_outb(info, UART_IER, info->ier);
+}
+
+void h4p_init_uart(struct h4p_info *info)
+{
+	u8 mcr, efr;
+
+	/* Enable and setup FIFO */
+	h4p_outb(info, UART_OMAP_MDR1, 0x00);
+
+	h4p_outb(info, UART_LCR, 0xbf);
+	efr = h4p_inb(info, UART_EFR);
+	h4p_outb(info, UART_EFR, UART_EFR_ECB);
+	h4p_outb(info, UART_LCR, UART_LCR_DLAB);
+	mcr = h4p_inb(info, UART_MCR);
+	h4p_outb(info, UART_MCR, UART_MCR_TCRTLR);
+	h4p_outb(info, UART_FCR, UART_FCR_ENABLE_FIFO |
+			UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT |
+			(3 << 6) | (0 << 4));
+	h4p_outb(info, UART_LCR, 0xbf);
+	h4p_outb(info, UART_TI752_TLR, 0xed);
+	h4p_outb(info, UART_TI752_TCR, 0xef);
+	h4p_outb(info, UART_EFR, efr);
+	h4p_outb(info, UART_LCR, UART_LCR_DLAB);
+	h4p_outb(info, UART_MCR, 0x00);
+	h4p_outb(info, UART_LCR, UART_LCR_WLEN8);
+	h4p_outb(info, UART_IER, UART_IER_RDI);
+	h4p_outb(info, UART_OMAP_SYSC, (1 << 0) | (1 << 2) | (2 << 3));
+}


-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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