Re: bluetooth on n900 -- working patch

Mark Rutland
2015-02-11T12:10:24Z

On Wed, Feb 11, 2015 at 10:41:36AM +0000, Pavel Machek wrote:
> 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

As I mentioned previously, these should be separate devices, using the
UART as a bus.

NAK to this pseudo-composite device.

Mark.

> - 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
>
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