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linux/drivers/bluetooth/hci_bcm.c
Chen-Yu Tsai 91927a9b35 Bluetooth: hci_bcm: Wait for device to come out of reset after power on 
The datasheets for BCM20702 and BCM43438 both have power up time
sequence graphs, however they are slightly different. Both chips
also have an internal power-on-reset, which holds the chip in reset
for a short time after the regulators are enabled.

For the BCM20702, the time period from when the regulators are enabled,
until the chip settles and comes out of sleep state, is 6564 ~ 8171 us.

For the BCM43438, the graph only shows the time period from when the
regulators are enabled until the chip responds by driving the host's
CTS line low, assuming the host has already driven its RTS line low.
This is shown to be 6.5 sleep cycles, with the sleep clock at 32.768
kHz. This is around 2 ms.

Wait a full 10 ms after the regulators are enabled to account for signal
rising times.

Tested-by: Ondrej Jirman <megous@megous.com>
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2018-12-19 00:28:39 +01:00

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/*
*
* Bluetooth HCI UART driver for Broadcom devices
*
* Copyright (C) 2015 Intel Corporation
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/skbuff.h>
#include <linux/firmware.h>
#include <linux/module.h>
#include <linux/acpi.h>
#include <linux/of.h>
#include <linux/property.h>
#include <linux/platform_data/x86/apple.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <linux/clk.h>
#include <linux/gpio/consumer.h>
#include <linux/tty.h>
#include <linux/interrupt.h>
#include <linux/dmi.h>
#include <linux/pm_runtime.h>
#include <linux/serdev.h>
#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>
#include "btbcm.h"
#include "hci_uart.h"
#define BCM_NULL_PKT 0x00
#define BCM_NULL_SIZE 0
#define BCM_LM_DIAG_PKT 0x07
#define BCM_LM_DIAG_SIZE 63
#define BCM_AUTOSUSPEND_DELAY 5000 /* default autosleep delay */
#define BCM_NUM_SUPPLIES 2
/**
* struct bcm_device - device driver resources
* @serdev_hu: HCI UART controller struct
* @list: bcm_device_list node
* @dev: physical UART slave
* @name: device name logged by bt_dev_*() functions
* @device_wakeup: BT_WAKE pin,
* assert = Bluetooth device must wake up or remain awake,
* deassert = Bluetooth device may sleep when sleep criteria are met
* @shutdown: BT_REG_ON pin,
* power up or power down Bluetooth device internal regulators
* @set_device_wakeup: callback to toggle BT_WAKE pin
* either by accessing @device_wakeup or by calling @btlp
* @set_shutdown: callback to toggle BT_REG_ON pin
* either by accessing @shutdown or by calling @btpu/@btpd
* @btlp: Apple ACPI method to toggle BT_WAKE pin ("Bluetooth Low Power")
* @btpu: Apple ACPI method to drive BT_REG_ON pin high ("Bluetooth Power Up")
* @btpd: Apple ACPI method to drive BT_REG_ON pin low ("Bluetooth Power Down")
* @txco_clk: external reference frequency clock used by Bluetooth device
* @lpo_clk: external LPO clock used by Bluetooth device
* @supplies: VBAT and VDDIO supplies used by Bluetooth device
* @res_enabled: whether clocks and supplies are prepared and enabled
* @init_speed: default baudrate of Bluetooth device;
* the host UART is initially set to this baudrate so that
* it can configure the Bluetooth device for @oper_speed
* @oper_speed: preferred baudrate of Bluetooth device;
* set to 0 if @init_speed is already the preferred baudrate
* @irq: interrupt triggered by HOST_WAKE_BT pin
* @irq_active_low: whether @irq is active low
* @hu: pointer to HCI UART controller struct,
* used to disable flow control during runtime suspend and system sleep
* @is_suspended: whether flow control is currently disabled
*/
struct bcm_device {
/* Must be the first member, hci_serdev.c expects this. */
struct hci_uart serdev_hu;
struct list_head list;
struct device *dev;
const char *name;
struct gpio_desc *device_wakeup;
struct gpio_desc *shutdown;
int (*set_device_wakeup)(struct bcm_device *, bool);
int (*set_shutdown)(struct bcm_device *, bool);
#ifdef CONFIG_ACPI
acpi_handle btlp, btpu, btpd;
int gpio_count;
int gpio_int_idx;
#endif
struct clk *txco_clk;
struct clk *lpo_clk;
struct regulator_bulk_data supplies[BCM_NUM_SUPPLIES];
bool res_enabled;
u32 init_speed;
u32 oper_speed;
int irq;
bool irq_active_low;
#ifdef CONFIG_PM
struct hci_uart *hu;
bool is_suspended;
#endif
};
/* generic bcm uart resources */
struct bcm_data {
struct sk_buff *rx_skb;
struct sk_buff_head txq;
struct bcm_device *dev;
};
/* List of BCM BT UART devices */
static DEFINE_MUTEX(bcm_device_lock);
static LIST_HEAD(bcm_device_list);
static int irq_polarity = -1;
module_param(irq_polarity, int, 0444);
MODULE_PARM_DESC(irq_polarity, "IRQ polarity 0: active-high 1: active-low");
static inline void host_set_baudrate(struct hci_uart *hu, unsigned int speed)
{
if (hu->serdev)
serdev_device_set_baudrate(hu->serdev, speed);
else
hci_uart_set_baudrate(hu, speed);
}
static int bcm_set_baudrate(struct hci_uart *hu, unsigned int speed)
{
struct hci_dev *hdev = hu->hdev;
struct sk_buff *skb;
struct bcm_update_uart_baud_rate param;
if (speed > 3000000) {
struct bcm_write_uart_clock_setting clock;
clock.type = BCM_UART_CLOCK_48MHZ;
bt_dev_dbg(hdev, "Set Controller clock (%d)", clock.type);
/* This Broadcom specific command changes the UART's controller
* clock for baud rate > 3000000.
*/
skb = __hci_cmd_sync(hdev, 0xfc45, 1, &clock, HCI_INIT_TIMEOUT);
if (IS_ERR(skb)) {
int err = PTR_ERR(skb);
bt_dev_err(hdev, "BCM: failed to write clock (%d)",
err);
return err;
}
kfree_skb(skb);
}
bt_dev_dbg(hdev, "Set Controller UART speed to %d bit/s", speed);
param.zero = cpu_to_le16(0);
param.baud_rate = cpu_to_le32(speed);
/* This Broadcom specific command changes the UART's controller baud
* rate.
*/
skb = __hci_cmd_sync(hdev, 0xfc18, sizeof(param), &param,
HCI_INIT_TIMEOUT);
if (IS_ERR(skb)) {
int err = PTR_ERR(skb);
bt_dev_err(hdev, "BCM: failed to write update baudrate (%d)",
err);
return err;
}
kfree_skb(skb);
return 0;
}
/* bcm_device_exists should be protected by bcm_device_lock */
static bool bcm_device_exists(struct bcm_device *device)
{
struct list_head *p;
#ifdef CONFIG_PM
/* Devices using serdev always exist */
if (device && device->hu && device->hu->serdev)
return true;
#endif
list_for_each(p, &bcm_device_list) {
struct bcm_device *dev = list_entry(p, struct bcm_device, list);
if (device == dev)
return true;
}
return false;
}
static int bcm_gpio_set_power(struct bcm_device *dev, bool powered)
{
int err;
if (powered && !dev->res_enabled) {
err = regulator_bulk_enable(BCM_NUM_SUPPLIES, dev->supplies);
if (err)
return err;
/* LPO clock needs to be 32.768 kHz */
err = clk_set_rate(dev->lpo_clk, 32768);
if (err) {
dev_err(dev->dev, "Could not set LPO clock rate\n");
goto err_regulator_disable;
}
err = clk_prepare_enable(dev->lpo_clk);
if (err)
goto err_regulator_disable;
err = clk_prepare_enable(dev->txco_clk);
if (err)
goto err_lpo_clk_disable;
}
err = dev->set_shutdown(dev, powered);
if (err)
goto err_txco_clk_disable;
err = dev->set_device_wakeup(dev, powered);
if (err)
goto err_revert_shutdown;
if (!powered && dev->res_enabled) {
clk_disable_unprepare(dev->txco_clk);
clk_disable_unprepare(dev->lpo_clk);
regulator_bulk_disable(BCM_NUM_SUPPLIES, dev->supplies);
}
/* wait for device to power on and come out of reset */
usleep_range(10000, 20000);
dev->res_enabled = powered;
return 0;
err_revert_shutdown:
dev->set_shutdown(dev, !powered);
err_txco_clk_disable:
if (powered && !dev->res_enabled)
clk_disable_unprepare(dev->txco_clk);
err_lpo_clk_disable:
if (powered && !dev->res_enabled)
clk_disable_unprepare(dev->lpo_clk);
err_regulator_disable:
if (powered && !dev->res_enabled)
regulator_bulk_disable(BCM_NUM_SUPPLIES, dev->supplies);
return err;
}
#ifdef CONFIG_PM
static irqreturn_t bcm_host_wake(int irq, void *data)
{
struct bcm_device *bdev = data;
bt_dev_dbg(bdev, "Host wake IRQ");
pm_runtime_get(bdev->dev);
pm_runtime_mark_last_busy(bdev->dev);
pm_runtime_put_autosuspend(bdev->dev);
return IRQ_HANDLED;
}
static int bcm_request_irq(struct bcm_data *bcm)
{
struct bcm_device *bdev = bcm->dev;
int err;
mutex_lock(&bcm_device_lock);
if (!bcm_device_exists(bdev)) {
err = -ENODEV;
goto unlock;
}
if (bdev->irq <= 0) {
err = -EOPNOTSUPP;
goto unlock;
}
err = devm_request_irq(bdev->dev, bdev->irq, bcm_host_wake,
bdev->irq_active_low ? IRQF_TRIGGER_FALLING :
IRQF_TRIGGER_RISING,
"host_wake", bdev);
if (err) {
bdev->irq = err;
goto unlock;
}
device_init_wakeup(bdev->dev, true);
pm_runtime_set_autosuspend_delay(bdev->dev,
BCM_AUTOSUSPEND_DELAY);
pm_runtime_use_autosuspend(bdev->dev);
pm_runtime_set_active(bdev->dev);
pm_runtime_enable(bdev->dev);
unlock:
mutex_unlock(&bcm_device_lock);
return err;
}
static const struct bcm_set_sleep_mode default_sleep_params = {
.sleep_mode = 1, /* 0=Disabled, 1=UART, 2=Reserved, 3=USB */
.idle_host = 2, /* idle threshold HOST, in 300ms */
.idle_dev = 2, /* idle threshold device, in 300ms */
.bt_wake_active = 1, /* BT_WAKE active mode: 1 = high, 0 = low */
.host_wake_active = 0, /* HOST_WAKE active mode: 1 = high, 0 = low */
.allow_host_sleep = 1, /* Allow host sleep in SCO flag */
.combine_modes = 1, /* Combine sleep and LPM flag */
.tristate_control = 0, /* Allow tri-state control of UART tx flag */
/* Irrelevant USB flags */
.usb_auto_sleep = 0,
.usb_resume_timeout = 0,
.break_to_host = 0,
.pulsed_host_wake = 1,
};
static int bcm_setup_sleep(struct hci_uart *hu)
{
struct bcm_data *bcm = hu->priv;
struct sk_buff *skb;
struct bcm_set_sleep_mode sleep_params = default_sleep_params;
sleep_params.host_wake_active = !bcm->dev->irq_active_low;
skb = __hci_cmd_sync(hu->hdev, 0xfc27, sizeof(sleep_params),
&sleep_params, HCI_INIT_TIMEOUT);
if (IS_ERR(skb)) {
int err = PTR_ERR(skb);
bt_dev_err(hu->hdev, "Sleep VSC failed (%d)", err);
return err;
}
kfree_skb(skb);
bt_dev_dbg(hu->hdev, "Set Sleep Parameters VSC succeeded");
return 0;
}
#else
static inline int bcm_request_irq(struct bcm_data *bcm) { return 0; }
static inline int bcm_setup_sleep(struct hci_uart *hu) { return 0; }
#endif
static int bcm_set_diag(struct hci_dev *hdev, bool enable)
{
struct hci_uart *hu = hci_get_drvdata(hdev);
struct bcm_data *bcm = hu->priv;
struct sk_buff *skb;
if (!test_bit(HCI_RUNNING, &hdev->flags))
return -ENETDOWN;
skb = bt_skb_alloc(3, GFP_KERNEL);
if (!skb)
return -ENOMEM;
skb_put_u8(skb, BCM_LM_DIAG_PKT);
skb_put_u8(skb, 0xf0);
skb_put_u8(skb, enable);
skb_queue_tail(&bcm->txq, skb);
hci_uart_tx_wakeup(hu);
return 0;
}
static int bcm_open(struct hci_uart *hu)
{
struct bcm_data *bcm;
struct list_head *p;
int err;
bt_dev_dbg(hu->hdev, "hu %p", hu);
bcm = kzalloc(sizeof(*bcm), GFP_KERNEL);
if (!bcm)
return -ENOMEM;
skb_queue_head_init(&bcm->txq);
hu->priv = bcm;
mutex_lock(&bcm_device_lock);
if (hu->serdev) {
bcm->dev = serdev_device_get_drvdata(hu->serdev);
goto out;
}
if (!hu->tty->dev)
goto out;
list_for_each(p, &bcm_device_list) {
struct bcm_device *dev = list_entry(p, struct bcm_device, list);
/* Retrieve saved bcm_device based on parent of the
* platform device (saved during device probe) and
* parent of tty device used by hci_uart
*/
if (hu->tty->dev->parent == dev->dev->parent) {
bcm->dev = dev;
#ifdef CONFIG_PM
dev->hu = hu;
#endif
break;
}
}
out:
if (bcm->dev) {
hu->init_speed = bcm->dev->init_speed;
hu->oper_speed = bcm->dev->oper_speed;
err = bcm_gpio_set_power(bcm->dev, true);
if (err)
goto err_unset_hu;
}
mutex_unlock(&bcm_device_lock);
return 0;
err_unset_hu:
#ifdef CONFIG_PM
if (!hu->serdev)
bcm->dev->hu = NULL;
#endif
mutex_unlock(&bcm_device_lock);
hu->priv = NULL;
kfree(bcm);
return err;
}
static int bcm_close(struct hci_uart *hu)
{
struct bcm_data *bcm = hu->priv;
struct bcm_device *bdev = NULL;
int err;
bt_dev_dbg(hu->hdev, "hu %p", hu);
/* Protect bcm->dev against removal of the device or driver */
mutex_lock(&bcm_device_lock);
if (hu->serdev) {
bdev = serdev_device_get_drvdata(hu->serdev);
} else if (bcm_device_exists(bcm->dev)) {
bdev = bcm->dev;
#ifdef CONFIG_PM
bdev->hu = NULL;
#endif
}
if (bdev) {
if (IS_ENABLED(CONFIG_PM) && bdev->irq > 0) {
devm_free_irq(bdev->dev, bdev->irq, bdev);
device_init_wakeup(bdev->dev, false);
pm_runtime_disable(bdev->dev);
}
err = bcm_gpio_set_power(bdev, false);
if (err)
bt_dev_err(hu->hdev, "Failed to power down");
else
pm_runtime_set_suspended(bdev->dev);
}
mutex_unlock(&bcm_device_lock);
skb_queue_purge(&bcm->txq);
kfree_skb(bcm->rx_skb);
kfree(bcm);
hu->priv = NULL;
return 0;
}
static int bcm_flush(struct hci_uart *hu)
{
struct bcm_data *bcm = hu->priv;
bt_dev_dbg(hu->hdev, "hu %p", hu);
skb_queue_purge(&bcm->txq);
return 0;
}
static int bcm_setup(struct hci_uart *hu)
{
struct bcm_data *bcm = hu->priv;
char fw_name[64];
const struct firmware *fw;
unsigned int speed;
int err;
bt_dev_dbg(hu->hdev, "hu %p", hu);
hu->hdev->set_diag = bcm_set_diag;
hu->hdev->set_bdaddr = btbcm_set_bdaddr;
err = btbcm_initialize(hu->hdev, fw_name, sizeof(fw_name), false);
if (err)
return err;
err = request_firmware(&fw, fw_name, &hu->hdev->dev);
if (err < 0) {
bt_dev_info(hu->hdev, "BCM: Patch %s not found", fw_name);
return 0;
}
err = btbcm_patchram(hu->hdev, fw);
if (err) {
bt_dev_info(hu->hdev, "BCM: Patch failed (%d)", err);
goto finalize;
}
/* Init speed if any */
if (hu->init_speed)
speed = hu->init_speed;
else if (hu->proto->init_speed)
speed = hu->proto->init_speed;
else
speed = 0;
if (speed)
host_set_baudrate(hu, speed);
/* Operational speed if any */
if (hu->oper_speed)
speed = hu->oper_speed;
else if (hu->proto->oper_speed)
speed = hu->proto->oper_speed;
else
speed = 0;
if (speed) {
err = bcm_set_baudrate(hu, speed);
if (!err)
host_set_baudrate(hu, speed);
}
finalize:
release_firmware(fw);
err = btbcm_finalize(hu->hdev);
if (err)
return err;
if (!bcm_request_irq(bcm))
err = bcm_setup_sleep(hu);
return err;
}
#define BCM_RECV_LM_DIAG \
.type = BCM_LM_DIAG_PKT, \
.hlen = BCM_LM_DIAG_SIZE, \
.loff = 0, \
.lsize = 0, \
.maxlen = BCM_LM_DIAG_SIZE
#define BCM_RECV_NULL \
.type = BCM_NULL_PKT, \
.hlen = BCM_NULL_SIZE, \
.loff = 0, \
.lsize = 0, \
.maxlen = BCM_NULL_SIZE
static const struct h4_recv_pkt bcm_recv_pkts[] = {
{ H4_RECV_ACL, .recv = hci_recv_frame },
{ H4_RECV_SCO, .recv = hci_recv_frame },
{ H4_RECV_EVENT, .recv = hci_recv_frame },
{ BCM_RECV_LM_DIAG, .recv = hci_recv_diag },
{ BCM_RECV_NULL, .recv = hci_recv_diag },
};
static int bcm_recv(struct hci_uart *hu, const void *data, int count)
{
struct bcm_data *bcm = hu->priv;
if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
return -EUNATCH;
bcm->rx_skb = h4_recv_buf(hu->hdev, bcm->rx_skb, data, count,
bcm_recv_pkts, ARRAY_SIZE(bcm_recv_pkts));
if (IS_ERR(bcm->rx_skb)) {
int err = PTR_ERR(bcm->rx_skb);
bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
bcm->rx_skb = NULL;
return err;
} else if (!bcm->rx_skb) {
/* Delay auto-suspend when receiving completed packet */
mutex_lock(&bcm_device_lock);
if (bcm->dev && bcm_device_exists(bcm->dev)) {
pm_runtime_get(bcm->dev->dev);
pm_runtime_mark_last_busy(bcm->dev->dev);
pm_runtime_put_autosuspend(bcm->dev->dev);
}
mutex_unlock(&bcm_device_lock);
}
return count;
}
static int bcm_enqueue(struct hci_uart *hu, struct sk_buff *skb)
{
struct bcm_data *bcm = hu->priv;
bt_dev_dbg(hu->hdev, "hu %p skb %p", hu, skb);
/* Prepend skb with frame type */
memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
skb_queue_tail(&bcm->txq, skb);
return 0;
}
static struct sk_buff *bcm_dequeue(struct hci_uart *hu)
{
struct bcm_data *bcm = hu->priv;
struct sk_buff *skb = NULL;
struct bcm_device *bdev = NULL;
mutex_lock(&bcm_device_lock);
if (bcm_device_exists(bcm->dev)) {
bdev = bcm->dev;
pm_runtime_get_sync(bdev->dev);
/* Shall be resumed here */
}
skb = skb_dequeue(&bcm->txq);
if (bdev) {
pm_runtime_mark_last_busy(bdev->dev);
pm_runtime_put_autosuspend(bdev->dev);
}
mutex_unlock(&bcm_device_lock);
return skb;
}
#ifdef CONFIG_PM
static int bcm_suspend_device(struct device *dev)
{
struct bcm_device *bdev = dev_get_drvdata(dev);
int err;
bt_dev_dbg(bdev, "");
if (!bdev->is_suspended && bdev->hu) {
hci_uart_set_flow_control(bdev->hu, true);
/* Once this returns, driver suspends BT via GPIO */
bdev->is_suspended = true;
}
/* Suspend the device */
err = bdev->set_device_wakeup(bdev, false);
if (err) {
if (bdev->is_suspended && bdev->hu) {
bdev->is_suspended = false;
hci_uart_set_flow_control(bdev->hu, false);
}
return -EBUSY;
}
bt_dev_dbg(bdev, "suspend, delaying 15 ms");
msleep(15);
return 0;
}
static int bcm_resume_device(struct device *dev)
{
struct bcm_device *bdev = dev_get_drvdata(dev);
int err;
bt_dev_dbg(bdev, "");
err = bdev->set_device_wakeup(bdev, true);
if (err) {
dev_err(dev, "Failed to power up\n");
return err;
}
bt_dev_dbg(bdev, "resume, delaying 15 ms");
msleep(15);
/* When this executes, the device has woken up already */
if (bdev->is_suspended && bdev->hu) {
bdev->is_suspended = false;
hci_uart_set_flow_control(bdev->hu, false);
}
return 0;
}
#endif
#ifdef CONFIG_PM_SLEEP
/* suspend callback */
static int bcm_suspend(struct device *dev)
{
struct bcm_device *bdev = dev_get_drvdata(dev);
int error;
bt_dev_dbg(bdev, "suspend: is_suspended %d", bdev->is_suspended);
/*
* When used with a device instantiated as platform_device, bcm_suspend
* can be called at any time as long as the platform device is bound,
* so it should use bcm_device_lock to protect access to hci_uart
* and device_wake-up GPIO.
*/
mutex_lock(&bcm_device_lock);
if (!bdev->hu)
goto unlock;
if (pm_runtime_active(dev))
bcm_suspend_device(dev);
if (device_may_wakeup(dev) && bdev->irq > 0) {
error = enable_irq_wake(bdev->irq);
if (!error)
bt_dev_dbg(bdev, "BCM irq: enabled");
}
unlock:
mutex_unlock(&bcm_device_lock);
return 0;
}
/* resume callback */
static int bcm_resume(struct device *dev)
{
struct bcm_device *bdev = dev_get_drvdata(dev);
int err = 0;
bt_dev_dbg(bdev, "resume: is_suspended %d", bdev->is_suspended);
/*
* When used with a device instantiated as platform_device, bcm_resume
* can be called at any time as long as platform device is bound,
* so it should use bcm_device_lock to protect access to hci_uart
* and device_wake-up GPIO.
*/
mutex_lock(&bcm_device_lock);
if (!bdev->hu)
goto unlock;
if (device_may_wakeup(dev) && bdev->irq > 0) {
disable_irq_wake(bdev->irq);
bt_dev_dbg(bdev, "BCM irq: disabled");
}
err = bcm_resume_device(dev);
unlock:
mutex_unlock(&bcm_device_lock);
if (!err) {
pm_runtime_disable(dev);
pm_runtime_set_active(dev);
pm_runtime_enable(dev);
}
return 0;
}
#endif
static const struct acpi_gpio_params first_gpio = { 0, 0, false };
static const struct acpi_gpio_params second_gpio = { 1, 0, false };
static const struct acpi_gpio_params third_gpio = { 2, 0, false };
static const struct acpi_gpio_mapping acpi_bcm_int_last_gpios[] = {
{ "device-wakeup-gpios", &first_gpio, 1 },
{ "shutdown-gpios", &second_gpio, 1 },
{ "host-wakeup-gpios", &third_gpio, 1 },
{ },
};
static const struct acpi_gpio_mapping acpi_bcm_int_first_gpios[] = {
{ "host-wakeup-gpios", &first_gpio, 1 },
{ "device-wakeup-gpios", &second_gpio, 1 },
{ "shutdown-gpios", &third_gpio, 1 },
{ },
};
/* Some firmware reports an IRQ which does not work (wrong pin in fw table?) */
static const struct dmi_system_id bcm_broken_irq_dmi_table[] = {
{
.ident = "Meegopad T08",
.matches = {
DMI_EXACT_MATCH(DMI_BOARD_VENDOR,
"To be filled by OEM."),
DMI_EXACT_MATCH(DMI_BOARD_NAME, "T3 MRD"),
DMI_EXACT_MATCH(DMI_BOARD_VERSION, "V1.1"),
},
},
{ }
};
#ifdef CONFIG_ACPI
static int bcm_resource(struct acpi_resource *ares, void *data)
{
struct bcm_device *dev = data;
struct acpi_resource_extended_irq *irq;
struct acpi_resource_gpio *gpio;
struct acpi_resource_uart_serialbus *sb;
switch (ares->type) {
case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
irq = &ares->data.extended_irq;
if (irq->polarity != ACPI_ACTIVE_LOW)
dev_info(dev->dev, "ACPI Interrupt resource is active-high, this is usually wrong, treating the IRQ as active-low\n");
dev->irq_active_low = true;
break;
case ACPI_RESOURCE_TYPE_GPIO:
gpio = &ares->data.gpio;
if (gpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT) {
dev->gpio_int_idx = dev->gpio_count;
dev->irq_active_low = gpio->polarity == ACPI_ACTIVE_LOW;
}
dev->gpio_count++;
break;
case ACPI_RESOURCE_TYPE_SERIAL_BUS:
sb = &ares->data.uart_serial_bus;
if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_UART) {
dev->init_speed = sb->default_baud_rate;
dev->oper_speed = 4000000;
}
break;
default:
break;
}
return 0;
}
static int bcm_apple_set_device_wakeup(struct bcm_device *dev, bool awake)
{
if (ACPI_FAILURE(acpi_execute_simple_method(dev->btlp, NULL, !awake)))
return -EIO;
return 0;
}
static int bcm_apple_set_shutdown(struct bcm_device *dev, bool powered)
{
if (ACPI_FAILURE(acpi_evaluate_object(powered ? dev->btpu : dev->btpd,
NULL, NULL, NULL)))
return -EIO;
return 0;
}
static int bcm_apple_get_resources(struct bcm_device *dev)
{
struct acpi_device *adev = ACPI_COMPANION(dev->dev);
const union acpi_object *obj;
if (!adev ||
ACPI_FAILURE(acpi_get_handle(adev->handle, "BTLP", &dev->btlp)) ||
ACPI_FAILURE(acpi_get_handle(adev->handle, "BTPU", &dev->btpu)) ||
ACPI_FAILURE(acpi_get_handle(adev->handle, "BTPD", &dev->btpd)))
return -ENODEV;
if (!acpi_dev_get_property(adev, "baud", ACPI_TYPE_BUFFER, &obj) &&
obj->buffer.length == 8)
dev->init_speed = *(u64 *)obj->buffer.pointer;
dev->set_device_wakeup = bcm_apple_set_device_wakeup;
dev->set_shutdown = bcm_apple_set_shutdown;
return 0;
}
#else
static inline int bcm_apple_get_resources(struct bcm_device *dev)
{
return -EOPNOTSUPP;
}
#endif /* CONFIG_ACPI */
static int bcm_gpio_set_device_wakeup(struct bcm_device *dev, bool awake)
{
gpiod_set_value_cansleep(dev->device_wakeup, awake);
return 0;
}
static int bcm_gpio_set_shutdown(struct bcm_device *dev, bool powered)
{
gpiod_set_value_cansleep(dev->shutdown, powered);
return 0;
}
/* Try a bunch of names for TXCO */
static struct clk *bcm_get_txco(struct device *dev)
{
struct clk *clk;
/* New explicit name */
clk = devm_clk_get(dev, "txco");
if (!IS_ERR(clk) || PTR_ERR(clk) == -EPROBE_DEFER)
return clk;
/* Deprecated name */
clk = devm_clk_get(dev, "extclk");
if (!IS_ERR(clk) || PTR_ERR(clk) == -EPROBE_DEFER)
return clk;
/* Original code used no name at all */
return devm_clk_get(dev, NULL);
}
static int bcm_get_resources(struct bcm_device *dev)
{
const struct dmi_system_id *dmi_id;
int err;
dev->name = dev_name(dev->dev);
if (x86_apple_machine && !bcm_apple_get_resources(dev))
return 0;
dev->txco_clk = bcm_get_txco(dev->dev);
/* Handle deferred probing */
if (dev->txco_clk == ERR_PTR(-EPROBE_DEFER))
return PTR_ERR(dev->txco_clk);
/* Ignore all other errors as before */
if (IS_ERR(dev->txco_clk))
dev->txco_clk = NULL;
dev->lpo_clk = devm_clk_get(dev->dev, "lpo");
if (dev->lpo_clk == ERR_PTR(-EPROBE_DEFER))
return PTR_ERR(dev->lpo_clk);
if (IS_ERR(dev->lpo_clk))
dev->lpo_clk = NULL;
/* Check if we accidentally fetched the lpo clock twice */
if (dev->lpo_clk && clk_is_match(dev->lpo_clk, dev->txco_clk)) {
devm_clk_put(dev->dev, dev->txco_clk);
dev->txco_clk = NULL;
}
dev->device_wakeup = devm_gpiod_get_optional(dev->dev, "device-wakeup",
GPIOD_OUT_LOW);
if (IS_ERR(dev->device_wakeup))
return PTR_ERR(dev->device_wakeup);
dev->shutdown = devm_gpiod_get_optional(dev->dev, "shutdown",
GPIOD_OUT_LOW);
if (IS_ERR(dev->shutdown))
return PTR_ERR(dev->shutdown);
dev->set_device_wakeup = bcm_gpio_set_device_wakeup;
dev->set_shutdown = bcm_gpio_set_shutdown;
dev->supplies[0].supply = "vbat";
dev->supplies[1].supply = "vddio";
err = devm_regulator_bulk_get(dev->dev, BCM_NUM_SUPPLIES,
dev->supplies);
if (err)
return err;
/* IRQ can be declared in ACPI table as Interrupt or GpioInt */
if (dev->irq <= 0) {
struct gpio_desc *gpio;
gpio = devm_gpiod_get_optional(dev->dev, "host-wakeup",
GPIOD_IN);
if (IS_ERR(gpio))
return PTR_ERR(gpio);
dev->irq = gpiod_to_irq(gpio);
}
dmi_id = dmi_first_match(bcm_broken_irq_dmi_table);
if (dmi_id) {
dev_info(dev->dev, "%s: Has a broken IRQ config, disabling IRQ support / runtime-pm\n",
dmi_id->ident);
dev->irq = 0;
}
dev_dbg(dev->dev, "BCM irq: %d\n", dev->irq);
return 0;
}
#ifdef CONFIG_ACPI
static int bcm_acpi_probe(struct bcm_device *dev)
{
LIST_HEAD(resources);
const struct acpi_gpio_mapping *gpio_mapping = acpi_bcm_int_last_gpios;
struct resource_entry *entry;
int ret;
/* Retrieve UART ACPI info */
dev->gpio_int_idx = -1;
ret = acpi_dev_get_resources(ACPI_COMPANION(dev->dev),
&resources, bcm_resource, dev);
if (ret < 0)
return ret;
resource_list_for_each_entry(entry, &resources) {
if (resource_type(entry->res) == IORESOURCE_IRQ) {
dev->irq = entry->res->start;
break;
}
}
acpi_dev_free_resource_list(&resources);
/* If the DSDT uses an Interrupt resource for the IRQ, then there are
* only 2 GPIO resources, we use the irq-last mapping for this, since
* we already have an irq the 3th / last mapping will not be used.
*/
if (dev->irq)
gpio_mapping = acpi_bcm_int_last_gpios;
else if (dev->gpio_int_idx == 0)
gpio_mapping = acpi_bcm_int_first_gpios;
else if (dev->gpio_int_idx == 2)
gpio_mapping = acpi_bcm_int_last_gpios;
else
dev_warn(dev->dev, "Unexpected ACPI gpio_int_idx: %d\n",
dev->gpio_int_idx);
/* Warn if our expectations are not met. */
if (dev->gpio_count != (dev->irq ? 2 : 3))
dev_warn(dev->dev, "Unexpected number of ACPI GPIOs: %d\n",
dev->gpio_count);
ret = devm_acpi_dev_add_driver_gpios(dev->dev, gpio_mapping);
if (ret)
return ret;
if (irq_polarity != -1) {
dev->irq_active_low = irq_polarity;
dev_warn(dev->dev, "Overwriting IRQ polarity to active %s by module-param\n",
dev->irq_active_low ? "low" : "high");
}
return 0;
}
#else
static int bcm_acpi_probe(struct bcm_device *dev)
{
return -EINVAL;
}
#endif /* CONFIG_ACPI */
static int bcm_of_probe(struct bcm_device *bdev)
{
device_property_read_u32(bdev->dev, "max-speed", &bdev->oper_speed);
return 0;
}
static int bcm_probe(struct platform_device *pdev)
{
struct bcm_device *dev;
int ret;
dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
if (!dev)
return -ENOMEM;
dev->dev = &pdev->dev;
dev->irq = platform_get_irq(pdev, 0);
if (has_acpi_companion(&pdev->dev)) {
ret = bcm_acpi_probe(dev);
if (ret)
return ret;
}
ret = bcm_get_resources(dev);
if (ret)
return ret;
platform_set_drvdata(pdev, dev);
dev_info(&pdev->dev, "%s device registered.\n", dev->name);
/* Place this instance on the device list */
mutex_lock(&bcm_device_lock);
list_add_tail(&dev->list, &bcm_device_list);
mutex_unlock(&bcm_device_lock);
ret = bcm_gpio_set_power(dev, false);
if (ret)
dev_err(&pdev->dev, "Failed to power down\n");
return 0;
}
static int bcm_remove(struct platform_device *pdev)
{
struct bcm_device *dev = platform_get_drvdata(pdev);
mutex_lock(&bcm_device_lock);
list_del(&dev->list);
mutex_unlock(&bcm_device_lock);
dev_info(&pdev->dev, "%s device unregistered.\n", dev->name);
return 0;
}
static const struct hci_uart_proto bcm_proto = {
.id = HCI_UART_BCM,
.name = "Broadcom",
.manufacturer = 15,
.init_speed = 115200,
.open = bcm_open,
.close = bcm_close,
.flush = bcm_flush,
.setup = bcm_setup,
.set_baudrate = bcm_set_baudrate,
.recv = bcm_recv,
.enqueue = bcm_enqueue,
.dequeue = bcm_dequeue,
};
#ifdef CONFIG_ACPI
static const struct acpi_device_id bcm_acpi_match[] = {
{ "BCM2E00" },
{ "BCM2E01" },
{ "BCM2E02" },
{ "BCM2E03" },
{ "BCM2E04" },
{ "BCM2E05" },
{ "BCM2E06" },
{ "BCM2E07" },
{ "BCM2E08" },
{ "BCM2E09" },
{ "BCM2E0A" },
{ "BCM2E0B" },
{ "BCM2E0C" },
{ "BCM2E0D" },
{ "BCM2E0E" },
{ "BCM2E0F" },
{ "BCM2E10" },
{ "BCM2E11" },
{ "BCM2E12" },
{ "BCM2E13" },
{ "BCM2E14" },
{ "BCM2E15" },
{ "BCM2E16" },
{ "BCM2E17" },
{ "BCM2E18" },
{ "BCM2E19" },
{ "BCM2E1A" },
{ "BCM2E1B" },
{ "BCM2E1C" },
{ "BCM2E1D" },
{ "BCM2E1F" },
{ "BCM2E20" },
{ "BCM2E21" },
{ "BCM2E22" },
{ "BCM2E23" },
{ "BCM2E24" },
{ "BCM2E25" },
{ "BCM2E26" },
{ "BCM2E27" },
{ "BCM2E28" },
{ "BCM2E29" },
{ "BCM2E2A" },
{ "BCM2E2B" },
{ "BCM2E2C" },
{ "BCM2E2D" },
{ "BCM2E2E" },
{ "BCM2E2F" },
{ "BCM2E30" },
{ "BCM2E31" },
{ "BCM2E32" },
{ "BCM2E33" },
{ "BCM2E34" },
{ "BCM2E35" },
{ "BCM2E36" },
{ "BCM2E37" },
{ "BCM2E38" },
{ "BCM2E39" },
{ "BCM2E3A" },
{ "BCM2E3B" },
{ "BCM2E3C" },
{ "BCM2E3D" },
{ "BCM2E3E" },
{ "BCM2E3F" },
{ "BCM2E40" },
{ "BCM2E41" },
{ "BCM2E42" },
{ "BCM2E43" },
{ "BCM2E44" },
{ "BCM2E45" },
{ "BCM2E46" },
{ "BCM2E47" },
{ "BCM2E48" },
{ "BCM2E49" },
{ "BCM2E4A" },
{ "BCM2E4B" },
{ "BCM2E4C" },
{ "BCM2E4D" },
{ "BCM2E4E" },
{ "BCM2E4F" },
{ "BCM2E50" },
{ "BCM2E51" },
{ "BCM2E52" },
{ "BCM2E53" },
{ "BCM2E54" },
{ "BCM2E55" },
{ "BCM2E56" },
{ "BCM2E57" },
{ "BCM2E58" },
{ "BCM2E59" },
{ "BCM2E5A" },
{ "BCM2E5B" },
{ "BCM2E5C" },
{ "BCM2E5D" },
{ "BCM2E5E" },
{ "BCM2E5F" },
{ "BCM2E60" },
{ "BCM2E61" },
{ "BCM2E62" },
{ "BCM2E63" },
{ "BCM2E64" },
{ "BCM2E65" },
{ "BCM2E66" },
{ "BCM2E67" },
{ "BCM2E68" },
{ "BCM2E69" },
{ "BCM2E6B" },
{ "BCM2E6D" },
{ "BCM2E6E" },
{ "BCM2E6F" },
{ "BCM2E70" },
{ "BCM2E71" },
{ "BCM2E72" },
{ "BCM2E73" },
{ "BCM2E74" },
{ "BCM2E75" },
{ "BCM2E76" },
{ "BCM2E77" },
{ "BCM2E78" },
{ "BCM2E79" },
{ "BCM2E7A" },
{ "BCM2E7B" },
{ "BCM2E7C" },
{ "BCM2E7D" },
{ "BCM2E7E" },
{ "BCM2E7F" },
{ "BCM2E80" },
{ "BCM2E81" },
{ "BCM2E82" },
{ "BCM2E83" },
{ "BCM2E84" },
{ "BCM2E85" },
{ "BCM2E86" },
{ "BCM2E87" },
{ "BCM2E88" },
{ "BCM2E89" },
{ "BCM2E8A" },
{ "BCM2E8B" },
{ "BCM2E8C" },
{ "BCM2E8D" },
{ "BCM2E8E" },
{ "BCM2E90" },
{ "BCM2E92" },
{ "BCM2E93" },
{ "BCM2E94" },
{ "BCM2E95" },
{ "BCM2E96" },
{ "BCM2E97" },
{ "BCM2E98" },
{ "BCM2E99" },
{ "BCM2E9A" },
{ "BCM2E9B" },
{ "BCM2E9C" },
{ "BCM2E9D" },
{ "BCM2EA0" },
{ "BCM2EA1" },
{ "BCM2EA2" },
{ "BCM2EA3" },
{ "BCM2EA4" },
{ "BCM2EA5" },
{ "BCM2EA6" },
{ "BCM2EA7" },
{ "BCM2EA8" },
{ "BCM2EA9" },
{ "BCM2EAA" },
{ "BCM2EAB" },
{ "BCM2EAC" },
{ },
};
MODULE_DEVICE_TABLE(acpi, bcm_acpi_match);
#endif
/* suspend and resume callbacks */
static const struct dev_pm_ops bcm_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(bcm_suspend, bcm_resume)
SET_RUNTIME_PM_OPS(bcm_suspend_device, bcm_resume_device, NULL)
};
static struct platform_driver bcm_driver = {
.probe = bcm_probe,
.remove = bcm_remove,
.driver = {
.name = "hci_bcm",
.acpi_match_table = ACPI_PTR(bcm_acpi_match),
.pm = &bcm_pm_ops,
},
};
static int bcm_serdev_probe(struct serdev_device *serdev)
{
struct bcm_device *bcmdev;
int err;
bcmdev = devm_kzalloc(&serdev->dev, sizeof(*bcmdev), GFP_KERNEL);
if (!bcmdev)
return -ENOMEM;
bcmdev->dev = &serdev->dev;
#ifdef CONFIG_PM
bcmdev->hu = &bcmdev->serdev_hu;
#endif
bcmdev->serdev_hu.serdev = serdev;
serdev_device_set_drvdata(serdev, bcmdev);
if (has_acpi_companion(&serdev->dev))
err = bcm_acpi_probe(bcmdev);
else
err = bcm_of_probe(bcmdev);
if (err)
return err;
err = bcm_get_resources(bcmdev);
if (err)
return err;
if (!bcmdev->shutdown) {
dev_warn(&serdev->dev,
"No reset resource, using default baud rate\n");
bcmdev->oper_speed = bcmdev->init_speed;
}
err = bcm_gpio_set_power(bcmdev, false);
if (err)
dev_err(&serdev->dev, "Failed to power down\n");
return hci_uart_register_device(&bcmdev->serdev_hu, &bcm_proto);
}
static void bcm_serdev_remove(struct serdev_device *serdev)
{
struct bcm_device *bcmdev = serdev_device_get_drvdata(serdev);
hci_uart_unregister_device(&bcmdev->serdev_hu);
}
#ifdef CONFIG_OF
static const struct of_device_id bcm_bluetooth_of_match[] = {
{ .compatible = "brcm,bcm43438-bt" },
{ },
};
MODULE_DEVICE_TABLE(of, bcm_bluetooth_of_match);
#endif
static struct serdev_device_driver bcm_serdev_driver = {
.probe = bcm_serdev_probe,
.remove = bcm_serdev_remove,
.driver = {
.name = "hci_uart_bcm",
.of_match_table = of_match_ptr(bcm_bluetooth_of_match),
.acpi_match_table = ACPI_PTR(bcm_acpi_match),
.pm = &bcm_pm_ops,
},
};
int __init bcm_init(void)
{
/* For now, we need to keep both platform device
* driver (ACPI generated) and serdev driver (DT).
*/
platform_driver_register(&bcm_driver);
serdev_device_driver_register(&bcm_serdev_driver);
return hci_uart_register_proto(&bcm_proto);
}
int __exit bcm_deinit(void)
{
platform_driver_unregister(&bcm_driver);
serdev_device_driver_unregister(&bcm_serdev_driver);
return hci_uart_unregister_proto(&bcm_proto);
}
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