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hci_qca.c
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// SPDX-License-Identifier: GPL-2.0-only
/*
* Bluetooth Software UART Qualcomm protocol
*
* HCI_IBS (HCI In-Band Sleep) is Qualcomm's power management
* protocol extension to H4.
*
* Copyright (C) 2007 Texas Instruments, Inc.
* Copyright (c) 2010, 2012, 2018 The Linux Foundation. All rights reserved.
*
* Acknowledgements:
* This file is based on hci_ll.c, which was...
* Written by Ohad Ben-Cohen <ohad@bencohen.org>
* which was in turn based on hci_h4.c, which was written
* by Maxim Krasnyansky and Marcel Holtmann.
*/
#include <linux/kernel.h>
#include <linux/clk.h>
#include <linux/completion.h>
#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/devcoredump.h>
#include <linux/device.h>
#include <linux/gpio/consumer.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/acpi.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <linux/serdev.h>
#include <linux/mutex.h>
#include <asm/unaligned.h>
#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>
#include "hci_uart.h"
#include "btqca.h"
/* HCI_IBS protocol messages */
#define HCI_IBS_SLEEP_IND 0xFE
#define HCI_IBS_WAKE_IND 0xFD
#define HCI_IBS_WAKE_ACK 0xFC
#define HCI_MAX_IBS_SIZE 10
#define IBS_WAKE_RETRANS_TIMEOUT_MS 100
#define IBS_BTSOC_TX_IDLE_TIMEOUT_MS 200
#define IBS_HOST_TX_IDLE_TIMEOUT_MS 2000
#define CMD_TRANS_TIMEOUT_MS 100
#define MEMDUMP_TIMEOUT_MS 8000
/* susclk rate */
#define SUSCLK_RATE_32KHZ 32768
/* Controller debug log header */
#define QCA_DEBUG_HANDLE 0x2EDC
/* max retry count when init fails */
#define MAX_INIT_RETRIES 3
/* Controller dump header */
#define QCA_SSR_DUMP_HANDLE 0x0108
#define QCA_DUMP_PACKET_SIZE 255
#define QCA_LAST_SEQUENCE_NUM 0xFFFF
#define QCA_CRASHBYTE_PACKET_LEN 1096
#define QCA_MEMDUMP_BYTE 0xFB
enum qca_flags {
QCA_IBS_ENABLED,
QCA_DROP_VENDOR_EVENT,
QCA_SUSPENDING,
QCA_MEMDUMP_COLLECTION,
QCA_HW_ERROR_EVENT,
QCA_SSR_TRIGGERED
};
enum qca_capabilities {
QCA_CAP_WIDEBAND_SPEECH = BIT(0),
QCA_CAP_VALID_LE_STATES = BIT(1),
};
/* HCI_IBS transmit side sleep protocol states */
enum tx_ibs_states {
HCI_IBS_TX_ASLEEP,
HCI_IBS_TX_WAKING,
HCI_IBS_TX_AWAKE,
};
/* HCI_IBS receive side sleep protocol states */
enum rx_states {
HCI_IBS_RX_ASLEEP,
HCI_IBS_RX_AWAKE,
};
/* HCI_IBS transmit and receive side clock state vote */
enum hci_ibs_clock_state_vote {
HCI_IBS_VOTE_STATS_UPDATE,
HCI_IBS_TX_VOTE_CLOCK_ON,
HCI_IBS_TX_VOTE_CLOCK_OFF,
HCI_IBS_RX_VOTE_CLOCK_ON,
HCI_IBS_RX_VOTE_CLOCK_OFF,
};
/* Controller memory dump states */
enum qca_memdump_states {
QCA_MEMDUMP_IDLE,
QCA_MEMDUMP_COLLECTING,
QCA_MEMDUMP_COLLECTED,
QCA_MEMDUMP_TIMEOUT,
};
struct qca_memdump_data {
char *memdump_buf_head;
char *memdump_buf_tail;
u32 current_seq_no;
u32 received_dump;
u32 ram_dump_size;
};
struct qca_memdump_event_hdr {
__u8 evt;
__u8 plen;
__u16 opcode;
__u16 seq_no;
__u8 reserved;
} __packed;
struct qca_dump_size {
u32 dump_size;
} __packed;
struct qca_data {
struct hci_uart *hu;
struct sk_buff *rx_skb;
struct sk_buff_head txq;
struct sk_buff_head tx_wait_q; /* HCI_IBS wait queue */
struct sk_buff_head rx_memdump_q; /* Memdump wait queue */
spinlock_t hci_ibs_lock; /* HCI_IBS state lock */
u8 tx_ibs_state; /* HCI_IBS transmit side power state*/
u8 rx_ibs_state; /* HCI_IBS receive side power state */
bool tx_vote; /* Clock must be on for TX */
bool rx_vote; /* Clock must be on for RX */
struct timer_list tx_idle_timer;
u32 tx_idle_delay;
struct timer_list wake_retrans_timer;
u32 wake_retrans;
struct workqueue_struct *workqueue;
struct work_struct ws_awake_rx;
struct work_struct ws_awake_device;
struct work_struct ws_rx_vote_off;
struct work_struct ws_tx_vote_off;
struct work_struct ctrl_memdump_evt;
struct delayed_work ctrl_memdump_timeout;
struct qca_memdump_data *qca_memdump;
unsigned long flags;
struct completion drop_ev_comp;
wait_queue_head_t suspend_wait_q;
enum qca_memdump_states memdump_state;
struct mutex hci_memdump_lock;
/* For debugging purpose */
u64 ibs_sent_wacks;
u64 ibs_sent_slps;
u64 ibs_sent_wakes;
u64 ibs_recv_wacks;
u64 ibs_recv_slps;
u64 ibs_recv_wakes;
u64 vote_last_jif;
u32 vote_on_ms;
u32 vote_off_ms;
u64 tx_votes_on;
u64 rx_votes_on;
u64 tx_votes_off;
u64 rx_votes_off;
u64 votes_on;
u64 votes_off;
};
enum qca_speed_type {
QCA_INIT_SPEED = 1,
QCA_OPER_SPEED
};
/*
* Voltage regulator information required for configuring the
* QCA Bluetooth chipset
*/
struct qca_vreg {
const char *name;
unsigned int load_uA;
};
struct qca_device_data {
enum qca_btsoc_type soc_type;
struct qca_vreg *vregs;
size_t num_vregs;
uint32_t capabilities;
};
/*
* Platform data for the QCA Bluetooth power driver.
*/
struct qca_power {
struct device *dev;
struct regulator_bulk_data *vreg_bulk;
int num_vregs;
bool vregs_on;
};
struct qca_serdev {
struct hci_uart serdev_hu;
struct gpio_desc *bt_en;
struct clk *susclk;
enum qca_btsoc_type btsoc_type;
struct qca_power *bt_power;
u32 init_speed;
u32 oper_speed;
const char *firmware_name;
};
static int qca_regulator_enable(struct qca_serdev *qcadev);
static void qca_regulator_disable(struct qca_serdev *qcadev);
static void qca_power_shutdown(struct hci_uart *hu);
static int qca_power_off(struct hci_dev *hdev);
static void qca_controller_memdump(struct work_struct *work);
static enum qca_btsoc_type qca_soc_type(struct hci_uart *hu)
{
enum qca_btsoc_type soc_type;
if (hu->serdev) {
struct qca_serdev *qsd = serdev_device_get_drvdata(hu->serdev);
soc_type = qsd->btsoc_type;
} else {
soc_type = QCA_ROME;
}
return soc_type;
}
static const char *qca_get_firmware_name(struct hci_uart *hu)
{
if (hu->serdev) {
struct qca_serdev *qsd = serdev_device_get_drvdata(hu->serdev);
return qsd->firmware_name;
} else {
return NULL;
}
}
static void __serial_clock_on(struct tty_struct *tty)
{
/* TODO: Some chipset requires to enable UART clock on client
* side to save power consumption or manual work is required.
* Please put your code to control UART clock here if needed
*/
}
static void __serial_clock_off(struct tty_struct *tty)
{
/* TODO: Some chipset requires to disable UART clock on client
* side to save power consumption or manual work is required.
* Please put your code to control UART clock off here if needed
*/
}
/* serial_clock_vote needs to be called with the ibs lock held */
static void serial_clock_vote(unsigned long vote, struct hci_uart *hu)
{
struct qca_data *qca = hu->priv;
unsigned int diff;
bool old_vote = (qca->tx_vote | qca->rx_vote);
bool new_vote;
switch (vote) {
case HCI_IBS_VOTE_STATS_UPDATE:
diff = jiffies_to_msecs(jiffies - qca->vote_last_jif);
if (old_vote)
qca->vote_off_ms += diff;
else
qca->vote_on_ms += diff;
return;
case HCI_IBS_TX_VOTE_CLOCK_ON:
qca->tx_vote = true;
qca->tx_votes_on++;
break;
case HCI_IBS_RX_VOTE_CLOCK_ON:
qca->rx_vote = true;
qca->rx_votes_on++;
break;
case HCI_IBS_TX_VOTE_CLOCK_OFF:
qca->tx_vote = false;
qca->tx_votes_off++;
break;
case HCI_IBS_RX_VOTE_CLOCK_OFF:
qca->rx_vote = false;
qca->rx_votes_off++;
break;
default:
BT_ERR("Voting irregularity");
return;
}
new_vote = qca->rx_vote | qca->tx_vote;
if (new_vote != old_vote) {
if (new_vote)
__serial_clock_on(hu->tty);
else
__serial_clock_off(hu->tty);
BT_DBG("Vote serial clock %s(%s)", new_vote ? "true" : "false",
vote ? "true" : "false");
diff = jiffies_to_msecs(jiffies - qca->vote_last_jif);
if (new_vote) {
qca->votes_on++;
qca->vote_off_ms += diff;
} else {
qca->votes_off++;
qca->vote_on_ms += diff;
}
qca->vote_last_jif = jiffies;
}
}
/* Builds and sends an HCI_IBS command packet.
* These are very simple packets with only 1 cmd byte.
*/
static int send_hci_ibs_cmd(u8 cmd, struct hci_uart *hu)
{
int err = 0;
struct sk_buff *skb = NULL;
struct qca_data *qca = hu->priv;
BT_DBG("hu %p send hci ibs cmd 0x%x", hu, cmd);
skb = bt_skb_alloc(1, GFP_ATOMIC);
if (!skb) {
BT_ERR("Failed to allocate memory for HCI_IBS packet");
return -ENOMEM;
}
/* Assign HCI_IBS type */
skb_put_u8(skb, cmd);
skb_queue_tail(&qca->txq, skb);
return err;
}
static void qca_wq_awake_device(struct work_struct *work)
{
struct qca_data *qca = container_of(work, struct qca_data,
ws_awake_device);
struct hci_uart *hu = qca->hu;
unsigned long retrans_delay;
unsigned long flags;
BT_DBG("hu %p wq awake device", hu);
/* Vote for serial clock */
serial_clock_vote(HCI_IBS_TX_VOTE_CLOCK_ON, hu);
spin_lock_irqsave(&qca->hci_ibs_lock, flags);
/* Send wake indication to device */
if (send_hci_ibs_cmd(HCI_IBS_WAKE_IND, hu) < 0)
BT_ERR("Failed to send WAKE to device");
qca->ibs_sent_wakes++;
/* Start retransmit timer */
retrans_delay = msecs_to_jiffies(qca->wake_retrans);
mod_timer(&qca->wake_retrans_timer, jiffies + retrans_delay);
spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
/* Actually send the packets */
hci_uart_tx_wakeup(hu);
}
static void qca_wq_awake_rx(struct work_struct *work)
{
struct qca_data *qca = container_of(work, struct qca_data,
ws_awake_rx);
struct hci_uart *hu = qca->hu;
unsigned long flags;
BT_DBG("hu %p wq awake rx", hu);
serial_clock_vote(HCI_IBS_RX_VOTE_CLOCK_ON, hu);
spin_lock_irqsave(&qca->hci_ibs_lock, flags);
qca->rx_ibs_state = HCI_IBS_RX_AWAKE;
/* Always acknowledge device wake up,
* sending IBS message doesn't count as TX ON.
*/
if (send_hci_ibs_cmd(HCI_IBS_WAKE_ACK, hu) < 0)
BT_ERR("Failed to acknowledge device wake up");
qca->ibs_sent_wacks++;
spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
/* Actually send the packets */
hci_uart_tx_wakeup(hu);
}
static void qca_wq_serial_rx_clock_vote_off(struct work_struct *work)
{
struct qca_data *qca = container_of(work, struct qca_data,
ws_rx_vote_off);
struct hci_uart *hu = qca->hu;
BT_DBG("hu %p rx clock vote off", hu);
serial_clock_vote(HCI_IBS_RX_VOTE_CLOCK_OFF, hu);
}
static void qca_wq_serial_tx_clock_vote_off(struct work_struct *work)
{
struct qca_data *qca = container_of(work, struct qca_data,
ws_tx_vote_off);
struct hci_uart *hu = qca->hu;
BT_DBG("hu %p tx clock vote off", hu);
/* Run HCI tx handling unlocked */
hci_uart_tx_wakeup(hu);
/* Now that message queued to tty driver, vote for tty clocks off.
* It is up to the tty driver to pend the clocks off until tx done.
*/
serial_clock_vote(HCI_IBS_TX_VOTE_CLOCK_OFF, hu);
}
static void hci_ibs_tx_idle_timeout(struct timer_list *t)
{
struct qca_data *qca = from_timer(qca, t, tx_idle_timer);
struct hci_uart *hu = qca->hu;
unsigned long flags;
BT_DBG("hu %p idle timeout in %d state", hu, qca->tx_ibs_state);
spin_lock_irqsave_nested(&qca->hci_ibs_lock,
flags, SINGLE_DEPTH_NESTING);
switch (qca->tx_ibs_state) {
case HCI_IBS_TX_AWAKE:
/* TX_IDLE, go to SLEEP */
if (send_hci_ibs_cmd(HCI_IBS_SLEEP_IND, hu) < 0) {
BT_ERR("Failed to send SLEEP to device");
break;
}
qca->tx_ibs_state = HCI_IBS_TX_ASLEEP;
qca->ibs_sent_slps++;
queue_work(qca->workqueue, &qca->ws_tx_vote_off);
break;
case HCI_IBS_TX_ASLEEP:
case HCI_IBS_TX_WAKING:
default:
BT_ERR("Spurious timeout tx state %d", qca->tx_ibs_state);
break;
}
spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
}
static void hci_ibs_wake_retrans_timeout(struct timer_list *t)
{
struct qca_data *qca = from_timer(qca, t, wake_retrans_timer);
struct hci_uart *hu = qca->hu;
unsigned long flags, retrans_delay;
bool retransmit = false;
BT_DBG("hu %p wake retransmit timeout in %d state",
hu, qca->tx_ibs_state);
spin_lock_irqsave_nested(&qca->hci_ibs_lock,
flags, SINGLE_DEPTH_NESTING);
/* Don't retransmit the HCI_IBS_WAKE_IND when suspending. */
if (test_bit(QCA_SUSPENDING, &qca->flags)) {
spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
return;
}
switch (qca->tx_ibs_state) {
case HCI_IBS_TX_WAKING:
/* No WAKE_ACK, retransmit WAKE */
retransmit = true;
if (send_hci_ibs_cmd(HCI_IBS_WAKE_IND, hu) < 0) {
BT_ERR("Failed to acknowledge device wake up");
break;
}
qca->ibs_sent_wakes++;
retrans_delay = msecs_to_jiffies(qca->wake_retrans);
mod_timer(&qca->wake_retrans_timer, jiffies + retrans_delay);
break;
case HCI_IBS_TX_ASLEEP:
case HCI_IBS_TX_AWAKE:
default:
BT_ERR("Spurious timeout tx state %d", qca->tx_ibs_state);
break;
}
spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
if (retransmit)
hci_uart_tx_wakeup(hu);
}
static void qca_controller_memdump_timeout(struct work_struct *work)
{
struct qca_data *qca = container_of(work, struct qca_data,
ctrl_memdump_timeout.work);
struct hci_uart *hu = qca->hu;
mutex_lock(&qca->hci_memdump_lock);
if (test_bit(QCA_MEMDUMP_COLLECTION, &qca->flags)) {
qca->memdump_state = QCA_MEMDUMP_TIMEOUT;
if (!test_bit(QCA_HW_ERROR_EVENT, &qca->flags)) {
/* Inject hw error event to reset the device
* and driver.
*/
hci_reset_dev(hu->hdev);
}
}
mutex_unlock(&qca->hci_memdump_lock);
}
/* Initialize protocol */
static int qca_open(struct hci_uart *hu)
{
struct qca_serdev *qcadev;
struct qca_data *qca;
BT_DBG("hu %p qca_open", hu);
if (!hci_uart_has_flow_control(hu))
return -EOPNOTSUPP;
qca = kzalloc(sizeof(struct qca_data), GFP_KERNEL);
if (!qca)
return -ENOMEM;
skb_queue_head_init(&qca->txq);
skb_queue_head_init(&qca->tx_wait_q);
skb_queue_head_init(&qca->rx_memdump_q);
spin_lock_init(&qca->hci_ibs_lock);
mutex_init(&qca->hci_memdump_lock);
qca->workqueue = alloc_ordered_workqueue("qca_wq", 0);
if (!qca->workqueue) {
BT_ERR("QCA Workqueue not initialized properly");
kfree(qca);
return -ENOMEM;
}
INIT_WORK(&qca->ws_awake_rx, qca_wq_awake_rx);
INIT_WORK(&qca->ws_awake_device, qca_wq_awake_device);
INIT_WORK(&qca->ws_rx_vote_off, qca_wq_serial_rx_clock_vote_off);
INIT_WORK(&qca->ws_tx_vote_off, qca_wq_serial_tx_clock_vote_off);
INIT_WORK(&qca->ctrl_memdump_evt, qca_controller_memdump);
INIT_DELAYED_WORK(&qca->ctrl_memdump_timeout,
qca_controller_memdump_timeout);
init_waitqueue_head(&qca->suspend_wait_q);
qca->hu = hu;
init_completion(&qca->drop_ev_comp);
/* Assume we start with both sides asleep -- extra wakes OK */
qca->tx_ibs_state = HCI_IBS_TX_ASLEEP;
qca->rx_ibs_state = HCI_IBS_RX_ASLEEP;
qca->vote_last_jif = jiffies;
hu->priv = qca;
if (hu->serdev) {
qcadev = serdev_device_get_drvdata(hu->serdev);
if (qca_is_wcn399x(qcadev->btsoc_type))
hu->init_speed = qcadev->init_speed;
if (qcadev->oper_speed)
hu->oper_speed = qcadev->oper_speed;
}
timer_setup(&qca->wake_retrans_timer, hci_ibs_wake_retrans_timeout, 0);
qca->wake_retrans = IBS_WAKE_RETRANS_TIMEOUT_MS;
timer_setup(&qca->tx_idle_timer, hci_ibs_tx_idle_timeout, 0);
qca->tx_idle_delay = IBS_HOST_TX_IDLE_TIMEOUT_MS;
BT_DBG("HCI_UART_QCA open, tx_idle_delay=%u, wake_retrans=%u",
qca->tx_idle_delay, qca->wake_retrans);
return 0;
}
static void qca_debugfs_init(struct hci_dev *hdev)
{
struct hci_uart *hu = hci_get_drvdata(hdev);
struct qca_data *qca = hu->priv;
struct dentry *ibs_dir;
umode_t mode;
if (!hdev->debugfs)
return;
ibs_dir = debugfs_create_dir("ibs", hdev->debugfs);
/* read only */
mode = S_IRUGO;
debugfs_create_u8("tx_ibs_state", mode, ibs_dir, &qca->tx_ibs_state);
debugfs_create_u8("rx_ibs_state", mode, ibs_dir, &qca->rx_ibs_state);
debugfs_create_u64("ibs_sent_sleeps", mode, ibs_dir,
&qca->ibs_sent_slps);
debugfs_create_u64("ibs_sent_wakes", mode, ibs_dir,
&qca->ibs_sent_wakes);
debugfs_create_u64("ibs_sent_wake_acks", mode, ibs_dir,
&qca->ibs_sent_wacks);
debugfs_create_u64("ibs_recv_sleeps", mode, ibs_dir,
&qca->ibs_recv_slps);
debugfs_create_u64("ibs_recv_wakes", mode, ibs_dir,
&qca->ibs_recv_wakes);
debugfs_create_u64("ibs_recv_wake_acks", mode, ibs_dir,
&qca->ibs_recv_wacks);
debugfs_create_bool("tx_vote", mode, ibs_dir, &qca->tx_vote);
debugfs_create_u64("tx_votes_on", mode, ibs_dir, &qca->tx_votes_on);
debugfs_create_u64("tx_votes_off", mode, ibs_dir, &qca->tx_votes_off);
debugfs_create_bool("rx_vote", mode, ibs_dir, &qca->rx_vote);
debugfs_create_u64("rx_votes_on", mode, ibs_dir, &qca->rx_votes_on);
debugfs_create_u64("rx_votes_off", mode, ibs_dir, &qca->rx_votes_off);
debugfs_create_u64("votes_on", mode, ibs_dir, &qca->votes_on);
debugfs_create_u64("votes_off", mode, ibs_dir, &qca->votes_off);
debugfs_create_u32("vote_on_ms", mode, ibs_dir, &qca->vote_on_ms);
debugfs_create_u32("vote_off_ms", mode, ibs_dir, &qca->vote_off_ms);
/* read/write */
mode = S_IRUGO | S_IWUSR;
debugfs_create_u32("wake_retrans", mode, ibs_dir, &qca->wake_retrans);
debugfs_create_u32("tx_idle_delay", mode, ibs_dir,
&qca->tx_idle_delay);
}
/* Flush protocol data */
static int qca_flush(struct hci_uart *hu)
{
struct qca_data *qca = hu->priv;
BT_DBG("hu %p qca flush", hu);
skb_queue_purge(&qca->tx_wait_q);
skb_queue_purge(&qca->txq);
return 0;
}
/* Close protocol */
static int qca_close(struct hci_uart *hu)
{
struct qca_data *qca = hu->priv;
BT_DBG("hu %p qca close", hu);
serial_clock_vote(HCI_IBS_VOTE_STATS_UPDATE, hu);
skb_queue_purge(&qca->tx_wait_q);
skb_queue_purge(&qca->txq);
skb_queue_purge(&qca->rx_memdump_q);
del_timer(&qca->tx_idle_timer);
del_timer(&qca->wake_retrans_timer);
destroy_workqueue(qca->workqueue);
qca->hu = NULL;
kfree_skb(qca->rx_skb);
hu->priv = NULL;
kfree(qca);
return 0;
}
/* Called upon a wake-up-indication from the device.
*/
static void device_want_to_wakeup(struct hci_uart *hu)
{
unsigned long flags;
struct qca_data *qca = hu->priv;
BT_DBG("hu %p want to wake up", hu);
spin_lock_irqsave(&qca->hci_ibs_lock, flags);
qca->ibs_recv_wakes++;
/* Don't wake the rx up when suspending. */
if (test_bit(QCA_SUSPENDING, &qca->flags)) {
spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
return;
}
switch (qca->rx_ibs_state) {
case HCI_IBS_RX_ASLEEP:
/* Make sure clock is on - we may have turned clock off since
* receiving the wake up indicator awake rx clock.
*/
queue_work(qca->workqueue, &qca->ws_awake_rx);
spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
return;
case HCI_IBS_RX_AWAKE:
/* Always acknowledge device wake up,
* sending IBS message doesn't count as TX ON.
*/
if (send_hci_ibs_cmd(HCI_IBS_WAKE_ACK, hu) < 0) {
BT_ERR("Failed to acknowledge device wake up");
break;
}
qca->ibs_sent_wacks++;
break;
default:
/* Any other state is illegal */
BT_ERR("Received HCI_IBS_WAKE_IND in rx state %d",
qca->rx_ibs_state);
break;
}
spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
/* Actually send the packets */
hci_uart_tx_wakeup(hu);
}
/* Called upon a sleep-indication from the device.
*/
static void device_want_to_sleep(struct hci_uart *hu)
{
unsigned long flags;
struct qca_data *qca = hu->priv;
BT_DBG("hu %p want to sleep in %d state", hu, qca->rx_ibs_state);
spin_lock_irqsave(&qca->hci_ibs_lock, flags);
qca->ibs_recv_slps++;
switch (qca->rx_ibs_state) {
case HCI_IBS_RX_AWAKE:
/* Update state */
qca->rx_ibs_state = HCI_IBS_RX_ASLEEP;
/* Vote off rx clock under workqueue */
queue_work(qca->workqueue, &qca->ws_rx_vote_off);
break;
case HCI_IBS_RX_ASLEEP:
break;
default:
/* Any other state is illegal */
BT_ERR("Received HCI_IBS_SLEEP_IND in rx state %d",
qca->rx_ibs_state);
break;
}
wake_up_interruptible(&qca->suspend_wait_q);
spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
}
/* Called upon wake-up-acknowledgement from the device
*/
static void device_woke_up(struct hci_uart *hu)
{
unsigned long flags, idle_delay;
struct qca_data *qca = hu->priv;
struct sk_buff *skb = NULL;
BT_DBG("hu %p woke up", hu);
spin_lock_irqsave(&qca->hci_ibs_lock, flags);
qca->ibs_recv_wacks++;
/* Don't react to the wake-up-acknowledgment when suspending. */
if (test_bit(QCA_SUSPENDING, &qca->flags)) {
spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
return;
}
switch (qca->tx_ibs_state) {
case HCI_IBS_TX_AWAKE:
/* Expect one if we send 2 WAKEs */
BT_DBG("Received HCI_IBS_WAKE_ACK in tx state %d",
qca->tx_ibs_state);
break;
case HCI_IBS_TX_WAKING:
/* Send pending packets */
while ((skb = skb_dequeue(&qca->tx_wait_q)))
skb_queue_tail(&qca->txq, skb);
/* Switch timers and change state to HCI_IBS_TX_AWAKE */
del_timer(&qca->wake_retrans_timer);
idle_delay = msecs_to_jiffies(qca->tx_idle_delay);
mod_timer(&qca->tx_idle_timer, jiffies + idle_delay);
qca->tx_ibs_state = HCI_IBS_TX_AWAKE;
break;
case HCI_IBS_TX_ASLEEP:
default:
BT_ERR("Received HCI_IBS_WAKE_ACK in tx state %d",
qca->tx_ibs_state);
break;
}
spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
/* Actually send the packets */
hci_uart_tx_wakeup(hu);
}
/* Enqueue frame for transmittion (padding, crc, etc) may be called from
* two simultaneous tasklets.
*/
static int qca_enqueue(struct hci_uart *hu, struct sk_buff *skb)
{
unsigned long flags = 0, idle_delay;
struct qca_data *qca = hu->priv;
BT_DBG("hu %p qca enq skb %p tx_ibs_state %d", hu, skb,
qca->tx_ibs_state);
if (test_bit(QCA_SSR_TRIGGERED, &qca->flags)) {
/* As SSR is in progress, ignore the packets */
bt_dev_dbg(hu->hdev, "SSR is in progress");
kfree_skb(skb);
return 0;
}
/* Prepend skb with frame type */
memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
spin_lock_irqsave(&qca->hci_ibs_lock, flags);
/* Don't go to sleep in middle of patch download or
* Out-Of-Band(GPIOs control) sleep is selected.
* Don't wake the device up when suspending.
*/
if (!test_bit(QCA_IBS_ENABLED, &qca->flags) ||
test_bit(QCA_SUSPENDING, &qca->flags)) {
skb_queue_tail(&qca->txq, skb);
spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
return 0;
}
/* Act according to current state */
switch (qca->tx_ibs_state) {
case HCI_IBS_TX_AWAKE:
BT_DBG("Device awake, sending normally");
skb_queue_tail(&qca->txq, skb);
idle_delay = msecs_to_jiffies(qca->tx_idle_delay);
mod_timer(&qca->tx_idle_timer, jiffies + idle_delay);
break;
case HCI_IBS_TX_ASLEEP:
BT_DBG("Device asleep, waking up and queueing packet");
/* Save packet for later */
skb_queue_tail(&qca->tx_wait_q, skb);
qca->tx_ibs_state = HCI_IBS_TX_WAKING;
/* Schedule a work queue to wake up device */
queue_work(qca->workqueue, &qca->ws_awake_device);
break;
case HCI_IBS_TX_WAKING:
BT_DBG("Device waking up, queueing packet");
/* Transient state; just keep packet for later */
skb_queue_tail(&qca->tx_wait_q, skb);
break;
default:
BT_ERR("Illegal tx state: %d (losing packet)",
qca->tx_ibs_state);
kfree_skb(skb);
break;
}
spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
return 0;
}
static int qca_ibs_sleep_ind(struct hci_dev *hdev, struct sk_buff *skb)
{
struct hci_uart *hu = hci_get_drvdata(hdev);
BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_SLEEP_IND);
device_want_to_sleep(hu);
kfree_skb(skb);
return 0;
}
static int qca_ibs_wake_ind(struct hci_dev *hdev, struct sk_buff *skb)
{
struct hci_uart *hu = hci_get_drvdata(hdev);
BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_WAKE_IND);
device_want_to_wakeup(hu);
kfree_skb(skb);
return 0;
}
static int qca_ibs_wake_ack(struct hci_dev *hdev, struct sk_buff *skb)
{
struct hci_uart *hu = hci_get_drvdata(hdev);
BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_WAKE_ACK);
device_woke_up(hu);
kfree_skb(skb);
return 0;
}
static int qca_recv_acl_data(struct hci_dev *hdev, struct sk_buff *skb)
{
/* We receive debug logs from chip as an ACL packets.
* Instead of sending the data to ACL to decode the
* received data, we are pushing them to the above layers
* as a diagnostic packet.
*/
if (get_unaligned_le16(skb->data) == QCA_DEBUG_HANDLE)
return hci_recv_diag(hdev, skb);
return hci_recv_frame(hdev, skb);
}
static void qca_controller_memdump(struct work_struct *work)
{
struct qca_data *qca = container_of(work, struct qca_data,
ctrl_memdump_evt);
struct hci_uart *hu = qca->hu;
struct sk_buff *skb;
struct qca_memdump_event_hdr *cmd_hdr;
struct qca_memdump_data *qca_memdump = qca->qca_memdump;
struct qca_dump_size *dump;
char *memdump_buf;
char nullBuff[QCA_DUMP_PACKET_SIZE] = { 0 };
u16 seq_no;
u32 dump_size;
u32 rx_size;
enum qca_btsoc_type soc_type = qca_soc_type(hu);
while ((skb = skb_dequeue(&qca->rx_memdump_q))) {
mutex_lock(&qca->hci_memdump_lock);
/* Skip processing the received packets if timeout detected
* or memdump collection completed.
*/
if (qca->memdump_state == QCA_MEMDUMP_TIMEOUT ||
qca->memdump_state == QCA_MEMDUMP_COLLECTED) {
mutex_unlock(&qca->hci_memdump_lock);
return;
}
if (!qca_memdump) {
qca_memdump = kzalloc(sizeof(struct qca_memdump_data),
GFP_ATOMIC);
if (!qca_memdump) {
mutex_unlock(&qca->hci_memdump_lock);
return;
}