bluetooth on n900 -- working patch

Pavel Machek
2015-02-11T10:41:44Z

Hi!

Here's current version of the bluetooth patch, I hope I did not miss
anything. This time including dts changes, so that driver is active.

I have firmware in /lib/firmware/nokia/bcmfw.bin

Best regards,
Pavel

Signed-off-by: Pavel Machek <pavel@ucw.cz>

diff --git a/Documentation/devicetree/bindings/serial/omap_serial.txt b/Documentation/devicetree/bindings/serial/omap_serial.txt
index 342eedd..e9fde42 100644
--- a/Documentation/devicetree/bindings/serial/omap_serial.txt
+++ b/Documentation/devicetree/bindings/serial/omap_serial.txt
@@ -4,7 +4,14 @@ Required properties:
- compatible : should be "ti,omap2-uart" for OMAP2 controllers
- compatible : should be "ti,omap3-uart" for OMAP3 controllers
- compatible : should be "ti,omap4-uart" for OMAP4 controllers
+- compatible : should be "ti+brcm,omap3-uart,bcm2048" for bcm2048
+ bluetooth connected to OMAP3 serial
- ti,hwmods : Must be "uart<n>", n being the instance number (1-based)

Optional properties:
- clock-frequency : frequency of the clock input to the UART
+
+Required properties for ti+brcm,omap3-uart,bcm2048:
+- reset-gpios : gpio for reset pin
+- host-wakeup-gpios : gpio for host wakeup
+- bluetooth-wakeup-gpios : gpio for bluetooth wakeup
diff --git a/arch/arm/boot/dts/omap3-n900.dts b/arch/arm/boot/dts/omap3-n900.dts
index b550c41..e19bbe8 100644
--- a/arch/arm/boot/dts/omap3-n900.dts
+++ b/arch/arm/boot/dts/omap3-n900.dts
@@ -821,9 +867,19 @@
};

&uart2 {
+ compatible = "ti+brcm,omap3-uart,bcm2048", "ti,omap3-uart";
interrupts-extended = <&intc 73 &omap3_pmx_core OMAP3_UART2_RX>;
pinctrl-names = "default";
pinctrl-0 = <&uart2_pins>;
+
+ clocks = <&uart2_fck>, <&uart2_ick>;
+ clock-names = "fck", "ick";
+
+ device {
+ reset-gpios = <&gpio3 27 GPIO_ACTIVE_HIGH>; /* 91 */
+ host-wakeup-gpios = <&gpio4 5 GPIO_ACTIVE_HIGH>; /* 101 */
+ bluetooth-wakeup-gpios = <&gpio2 5 GPIO_ACTIVE_HIGH>; /* 37 */
+ };
};

&uart3 {
diff --git a/arch/arm/boot/dts/omap3.dtsi b/arch/arm/boot/dts/omap3.dtsi
index 01b7111..60e6d6b 100644
--- a/arch/arm/boot/dts/omap3.dtsi
+++ b/arch/arm/boot/dts/omap3.dtsi
@@ -275,7 +275,8 @@
};

uart2: serial@4806c000 {
- compatible = "ti,omap3-uart";
+ // This is bluetooth on n900, ttyO1
+ compatible = "not-a-ti,omap3-not-a-uart";
reg = <0x4806c000 0x400>;
interrupts-extended = <&intc 73>;
dmas = <&sdma 51 &sdma 52>;
diff --git a/drivers/bluetooth/Kconfig b/drivers/bluetooth/Kconfig
index 364f080..e1e1935 100644
--- a/drivers/bluetooth/Kconfig
+++ b/drivers/bluetooth/Kconfig
@@ -244,4 +244,14 @@ 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..ad461a9
--- /dev/null
+++ b/drivers/bluetooth/nokia_core.c
@@ -0,0 +1,1140 @@
+/*
+ * 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.
+ *
+ * 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 */
+ info->bt_sysclk = 2;
+
+ 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 necessary 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 = "ti+brcm,omap3-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..f43fa0a
--- /dev/null
+++ b/drivers/bluetooth/nokia_fw.c
@@ -0,0 +1,96 @@
+/*
+ * 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.
+ *
+ */
+
+#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;
+ }
+ kfree_skb(skb);
+ }
+
+ 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..a5923ee
--- /dev/null
+++ b/drivers/bluetooth/nokia_h4p.h
@@ -0,0 +1,206 @@
+/*
+ * 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.
+ */
+
+#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)
+{
+ return __raw_readb(info->uart_base + (offset << 2));
+}
+
+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..88cdd67
--- /dev/null
+++ b/drivers/bluetooth/nokia_uart.c
@@ -0,0 +1,166 @@
+/*
+ * 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.
+ *
+ */
+
+#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