145051539SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only
2166d2f6aSOhad Ben-Cohen /*
3166d2f6aSOhad Ben-Cohen * Texas Instruments' Bluetooth HCILL UART protocol
4166d2f6aSOhad Ben-Cohen *
5166d2f6aSOhad Ben-Cohen * HCILL (HCI Low Level) is a Texas Instruments' power management
6166d2f6aSOhad Ben-Cohen * protocol extension to H4.
7166d2f6aSOhad Ben-Cohen *
8166d2f6aSOhad Ben-Cohen * Copyright (C) 2007 Texas Instruments, Inc.
9166d2f6aSOhad Ben-Cohen *
10166d2f6aSOhad Ben-Cohen * Written by Ohad Ben-Cohen <ohad@bencohen.org>
11166d2f6aSOhad Ben-Cohen *
12166d2f6aSOhad Ben-Cohen * Acknowledgements:
13166d2f6aSOhad Ben-Cohen * This file is based on hci_h4.c, which was written
14166d2f6aSOhad Ben-Cohen * by Maxim Krasnyansky and Marcel Holtmann.
15166d2f6aSOhad Ben-Cohen */
16166d2f6aSOhad Ben-Cohen
17166d2f6aSOhad Ben-Cohen #include <linux/module.h>
18166d2f6aSOhad Ben-Cohen #include <linux/kernel.h>
19166d2f6aSOhad Ben-Cohen
20166d2f6aSOhad Ben-Cohen #include <linux/init.h>
21166d2f6aSOhad Ben-Cohen #include <linux/sched.h>
22166d2f6aSOhad Ben-Cohen #include <linux/types.h>
23166d2f6aSOhad Ben-Cohen #include <linux/fcntl.h>
2437180552SRob Herring #include <linux/firmware.h>
25166d2f6aSOhad Ben-Cohen #include <linux/interrupt.h>
26166d2f6aSOhad Ben-Cohen #include <linux/ptrace.h>
27166d2f6aSOhad Ben-Cohen #include <linux/poll.h>
28166d2f6aSOhad Ben-Cohen
29166d2f6aSOhad Ben-Cohen #include <linux/slab.h>
30166d2f6aSOhad Ben-Cohen #include <linux/errno.h>
31166d2f6aSOhad Ben-Cohen #include <linux/string.h>
32166d2f6aSOhad Ben-Cohen #include <linux/signal.h>
33166d2f6aSOhad Ben-Cohen #include <linux/ioctl.h>
3437180552SRob Herring #include <linux/of.h>
3537180552SRob Herring #include <linux/serdev.h>
36166d2f6aSOhad Ben-Cohen #include <linux/skbuff.h>
3737180552SRob Herring #include <linux/ti_wilink_st.h>
3843d3d092SUlf Hansson #include <linux/clk.h>
39166d2f6aSOhad Ben-Cohen
40166d2f6aSOhad Ben-Cohen #include <net/bluetooth/bluetooth.h>
41166d2f6aSOhad Ben-Cohen #include <net/bluetooth/hci_core.h>
4237180552SRob Herring #include <linux/gpio/consumer.h>
430e58d0cdSDavid Lechner #include <linux/nvmem-consumer.h>
44166d2f6aSOhad Ben-Cohen
45166d2f6aSOhad Ben-Cohen #include "hci_uart.h"
46166d2f6aSOhad Ben-Cohen
477c6ca120SDavid Lechner /* Vendor-specific HCI commands */
48aa099398SDavid Lechner #define HCI_VS_WRITE_BD_ADDR 0xfc06
497c6ca120SDavid Lechner #define HCI_VS_UPDATE_UART_HCI_BAUDRATE 0xff36
507c6ca120SDavid Lechner
51166d2f6aSOhad Ben-Cohen /* HCILL commands */
52166d2f6aSOhad Ben-Cohen #define HCILL_GO_TO_SLEEP_IND 0x30
53166d2f6aSOhad Ben-Cohen #define HCILL_GO_TO_SLEEP_ACK 0x31
54166d2f6aSOhad Ben-Cohen #define HCILL_WAKE_UP_IND 0x32
55166d2f6aSOhad Ben-Cohen #define HCILL_WAKE_UP_ACK 0x33
56166d2f6aSOhad Ben-Cohen
57166d2f6aSOhad Ben-Cohen /* HCILL states */
58166d2f6aSOhad Ben-Cohen enum hcill_states_e {
59166d2f6aSOhad Ben-Cohen HCILL_ASLEEP,
60166d2f6aSOhad Ben-Cohen HCILL_ASLEEP_TO_AWAKE,
61166d2f6aSOhad Ben-Cohen HCILL_AWAKE,
62166d2f6aSOhad Ben-Cohen HCILL_AWAKE_TO_ASLEEP
63166d2f6aSOhad Ben-Cohen };
64166d2f6aSOhad Ben-Cohen
6537180552SRob Herring struct ll_device {
6637180552SRob Herring struct hci_uart hu;
6737180552SRob Herring struct serdev_device *serdev;
6837180552SRob Herring struct gpio_desc *enable_gpio;
6943d3d092SUlf Hansson struct clk *ext_clk;
700e58d0cdSDavid Lechner bdaddr_t bdaddr;
7137180552SRob Herring };
7237180552SRob Herring
73166d2f6aSOhad Ben-Cohen struct ll_struct {
74166d2f6aSOhad Ben-Cohen struct sk_buff *rx_skb;
75166d2f6aSOhad Ben-Cohen struct sk_buff_head txq;
76166d2f6aSOhad Ben-Cohen spinlock_t hcill_lock; /* HCILL state lock */
77166d2f6aSOhad Ben-Cohen unsigned long hcill_state; /* HCILL power state */
78166d2f6aSOhad Ben-Cohen struct sk_buff_head tx_wait_q; /* HCILL wait queue */
79166d2f6aSOhad Ben-Cohen };
80166d2f6aSOhad Ben-Cohen
81166d2f6aSOhad Ben-Cohen /*
82166d2f6aSOhad Ben-Cohen * Builds and sends an HCILL command packet.
83166d2f6aSOhad Ben-Cohen * These are very simple packets with only 1 cmd byte
84166d2f6aSOhad Ben-Cohen */
send_hcill_cmd(u8 cmd,struct hci_uart * hu)85166d2f6aSOhad Ben-Cohen static int send_hcill_cmd(u8 cmd, struct hci_uart *hu)
86166d2f6aSOhad Ben-Cohen {
87166d2f6aSOhad Ben-Cohen int err = 0;
88166d2f6aSOhad Ben-Cohen struct sk_buff *skb = NULL;
89166d2f6aSOhad Ben-Cohen struct ll_struct *ll = hu->priv;
90166d2f6aSOhad Ben-Cohen
91166d2f6aSOhad Ben-Cohen BT_DBG("hu %p cmd 0x%x", hu, cmd);
92166d2f6aSOhad Ben-Cohen
93166d2f6aSOhad Ben-Cohen /* allocate packet */
94166d2f6aSOhad Ben-Cohen skb = bt_skb_alloc(1, GFP_ATOMIC);
95166d2f6aSOhad Ben-Cohen if (!skb) {
96166d2f6aSOhad Ben-Cohen BT_ERR("cannot allocate memory for HCILL packet");
97166d2f6aSOhad Ben-Cohen err = -ENOMEM;
98166d2f6aSOhad Ben-Cohen goto out;
99166d2f6aSOhad Ben-Cohen }
100166d2f6aSOhad Ben-Cohen
101166d2f6aSOhad Ben-Cohen /* prepare packet */
1029bef22fbSMarcel Holtmann skb_put_u8(skb, cmd);
103166d2f6aSOhad Ben-Cohen
104166d2f6aSOhad Ben-Cohen /* send packet */
105166d2f6aSOhad Ben-Cohen skb_queue_tail(&ll->txq, skb);
106166d2f6aSOhad Ben-Cohen out:
107166d2f6aSOhad Ben-Cohen return err;
108166d2f6aSOhad Ben-Cohen }
109166d2f6aSOhad Ben-Cohen
110166d2f6aSOhad Ben-Cohen /* Initialize protocol */
ll_open(struct hci_uart * hu)111166d2f6aSOhad Ben-Cohen static int ll_open(struct hci_uart *hu)
112166d2f6aSOhad Ben-Cohen {
113166d2f6aSOhad Ben-Cohen struct ll_struct *ll;
114166d2f6aSOhad Ben-Cohen
115166d2f6aSOhad Ben-Cohen BT_DBG("hu %p", hu);
116166d2f6aSOhad Ben-Cohen
1179eb648c3SDavid Herrmann ll = kzalloc(sizeof(*ll), GFP_KERNEL);
118166d2f6aSOhad Ben-Cohen if (!ll)
119166d2f6aSOhad Ben-Cohen return -ENOMEM;
120166d2f6aSOhad Ben-Cohen
121166d2f6aSOhad Ben-Cohen skb_queue_head_init(&ll->txq);
122166d2f6aSOhad Ben-Cohen skb_queue_head_init(&ll->tx_wait_q);
123166d2f6aSOhad Ben-Cohen spin_lock_init(&ll->hcill_lock);
124166d2f6aSOhad Ben-Cohen
125166d2f6aSOhad Ben-Cohen ll->hcill_state = HCILL_AWAKE;
126166d2f6aSOhad Ben-Cohen
127166d2f6aSOhad Ben-Cohen hu->priv = ll;
128166d2f6aSOhad Ben-Cohen
12943d3d092SUlf Hansson if (hu->serdev) {
13043d3d092SUlf Hansson struct ll_device *lldev = serdev_device_get_drvdata(hu->serdev);
13182b7d856SFabian Schindlatz
13243d3d092SUlf Hansson if (!IS_ERR(lldev->ext_clk))
13343d3d092SUlf Hansson clk_prepare_enable(lldev->ext_clk);
13443d3d092SUlf Hansson }
13537180552SRob Herring
136166d2f6aSOhad Ben-Cohen return 0;
137166d2f6aSOhad Ben-Cohen }
138166d2f6aSOhad Ben-Cohen
139166d2f6aSOhad Ben-Cohen /* Flush protocol data */
ll_flush(struct hci_uart * hu)140166d2f6aSOhad Ben-Cohen static int ll_flush(struct hci_uart *hu)
141166d2f6aSOhad Ben-Cohen {
142166d2f6aSOhad Ben-Cohen struct ll_struct *ll = hu->priv;
143166d2f6aSOhad Ben-Cohen
144166d2f6aSOhad Ben-Cohen BT_DBG("hu %p", hu);
145166d2f6aSOhad Ben-Cohen
146166d2f6aSOhad Ben-Cohen skb_queue_purge(&ll->tx_wait_q);
147166d2f6aSOhad Ben-Cohen skb_queue_purge(&ll->txq);
148166d2f6aSOhad Ben-Cohen
149166d2f6aSOhad Ben-Cohen return 0;
150166d2f6aSOhad Ben-Cohen }
151166d2f6aSOhad Ben-Cohen
152166d2f6aSOhad Ben-Cohen /* Close protocol */
ll_close(struct hci_uart * hu)153166d2f6aSOhad Ben-Cohen static int ll_close(struct hci_uart *hu)
154166d2f6aSOhad Ben-Cohen {
155166d2f6aSOhad Ben-Cohen struct ll_struct *ll = hu->priv;
156166d2f6aSOhad Ben-Cohen
157166d2f6aSOhad Ben-Cohen BT_DBG("hu %p", hu);
158166d2f6aSOhad Ben-Cohen
159166d2f6aSOhad Ben-Cohen skb_queue_purge(&ll->tx_wait_q);
160166d2f6aSOhad Ben-Cohen skb_queue_purge(&ll->txq);
161166d2f6aSOhad Ben-Cohen
162166d2f6aSOhad Ben-Cohen kfree_skb(ll->rx_skb);
163166d2f6aSOhad Ben-Cohen
16437180552SRob Herring if (hu->serdev) {
16537180552SRob Herring struct ll_device *lldev = serdev_device_get_drvdata(hu->serdev);
16682b7d856SFabian Schindlatz
16737180552SRob Herring gpiod_set_value_cansleep(lldev->enable_gpio, 0);
16837180552SRob Herring
16943d3d092SUlf Hansson clk_disable_unprepare(lldev->ext_clk);
17037180552SRob Herring }
17137180552SRob Herring
172166d2f6aSOhad Ben-Cohen hu->priv = NULL;
173166d2f6aSOhad Ben-Cohen
174166d2f6aSOhad Ben-Cohen kfree(ll);
175166d2f6aSOhad Ben-Cohen
176166d2f6aSOhad Ben-Cohen return 0;
177166d2f6aSOhad Ben-Cohen }
178166d2f6aSOhad Ben-Cohen
179166d2f6aSOhad Ben-Cohen /*
180166d2f6aSOhad Ben-Cohen * internal function, which does common work of the device wake up process:
181166d2f6aSOhad Ben-Cohen * 1. places all pending packets (waiting in tx_wait_q list) in txq list.
182166d2f6aSOhad Ben-Cohen * 2. changes internal state to HCILL_AWAKE.
183166d2f6aSOhad Ben-Cohen * Note: assumes that hcill_lock spinlock is taken,
184166d2f6aSOhad Ben-Cohen * shouldn't be called otherwise!
185166d2f6aSOhad Ben-Cohen */
__ll_do_awake(struct ll_struct * ll)186166d2f6aSOhad Ben-Cohen static void __ll_do_awake(struct ll_struct *ll)
187166d2f6aSOhad Ben-Cohen {
188166d2f6aSOhad Ben-Cohen struct sk_buff *skb = NULL;
189166d2f6aSOhad Ben-Cohen
190166d2f6aSOhad Ben-Cohen while ((skb = skb_dequeue(&ll->tx_wait_q)))
191166d2f6aSOhad Ben-Cohen skb_queue_tail(&ll->txq, skb);
192166d2f6aSOhad Ben-Cohen
193166d2f6aSOhad Ben-Cohen ll->hcill_state = HCILL_AWAKE;
194166d2f6aSOhad Ben-Cohen }
195166d2f6aSOhad Ben-Cohen
196166d2f6aSOhad Ben-Cohen /*
197166d2f6aSOhad Ben-Cohen * Called upon a wake-up-indication from the device
198166d2f6aSOhad Ben-Cohen */
ll_device_want_to_wakeup(struct hci_uart * hu)199166d2f6aSOhad Ben-Cohen static void ll_device_want_to_wakeup(struct hci_uart *hu)
200166d2f6aSOhad Ben-Cohen {
201166d2f6aSOhad Ben-Cohen unsigned long flags;
202166d2f6aSOhad Ben-Cohen struct ll_struct *ll = hu->priv;
203166d2f6aSOhad Ben-Cohen
204166d2f6aSOhad Ben-Cohen BT_DBG("hu %p", hu);
205166d2f6aSOhad Ben-Cohen
206166d2f6aSOhad Ben-Cohen /* lock hcill state */
207166d2f6aSOhad Ben-Cohen spin_lock_irqsave(&ll->hcill_lock, flags);
208166d2f6aSOhad Ben-Cohen
209166d2f6aSOhad Ben-Cohen switch (ll->hcill_state) {
2105c548226SOhad Ben-Cohen case HCILL_ASLEEP_TO_AWAKE:
2115c548226SOhad Ben-Cohen /*
2125c548226SOhad Ben-Cohen * This state means that both the host and the BRF chip
2135c548226SOhad Ben-Cohen * have simultaneously sent a wake-up-indication packet.
21425985edcSLucas De Marchi * Traditionally, in this case, receiving a wake-up-indication
2155c548226SOhad Ben-Cohen * was enough and an additional wake-up-ack wasn't needed.
2165c548226SOhad Ben-Cohen * This has changed with the BRF6350, which does require an
2175c548226SOhad Ben-Cohen * explicit wake-up-ack. Other BRF versions, which do not
2185c548226SOhad Ben-Cohen * require an explicit ack here, do accept it, thus it is
2195c548226SOhad Ben-Cohen * perfectly safe to always send one.
2205c548226SOhad Ben-Cohen */
2215c548226SOhad Ben-Cohen BT_DBG("dual wake-up-indication");
222a3b4cbfcSGustavo A. R. Silva fallthrough;
223166d2f6aSOhad Ben-Cohen case HCILL_ASLEEP:
224166d2f6aSOhad Ben-Cohen /* acknowledge device wake up */
225166d2f6aSOhad Ben-Cohen if (send_hcill_cmd(HCILL_WAKE_UP_ACK, hu) < 0) {
226166d2f6aSOhad Ben-Cohen BT_ERR("cannot acknowledge device wake up");
227166d2f6aSOhad Ben-Cohen goto out;
228166d2f6aSOhad Ben-Cohen }
229166d2f6aSOhad Ben-Cohen break;
230166d2f6aSOhad Ben-Cohen default:
2315c548226SOhad Ben-Cohen /* any other state is illegal */
23282b7d856SFabian Schindlatz BT_ERR("received HCILL_WAKE_UP_IND in state %ld",
23382b7d856SFabian Schindlatz ll->hcill_state);
234166d2f6aSOhad Ben-Cohen break;
235166d2f6aSOhad Ben-Cohen }
236166d2f6aSOhad Ben-Cohen
237166d2f6aSOhad Ben-Cohen /* send pending packets and change state to HCILL_AWAKE */
238166d2f6aSOhad Ben-Cohen __ll_do_awake(ll);
239166d2f6aSOhad Ben-Cohen
240166d2f6aSOhad Ben-Cohen out:
241166d2f6aSOhad Ben-Cohen spin_unlock_irqrestore(&ll->hcill_lock, flags);
242166d2f6aSOhad Ben-Cohen
243166d2f6aSOhad Ben-Cohen /* actually send the packets */
244166d2f6aSOhad Ben-Cohen hci_uart_tx_wakeup(hu);
245166d2f6aSOhad Ben-Cohen }
246166d2f6aSOhad Ben-Cohen
247166d2f6aSOhad Ben-Cohen /*
248166d2f6aSOhad Ben-Cohen * Called upon a sleep-indication from the device
249166d2f6aSOhad Ben-Cohen */
ll_device_want_to_sleep(struct hci_uart * hu)250166d2f6aSOhad Ben-Cohen static void ll_device_want_to_sleep(struct hci_uart *hu)
251166d2f6aSOhad Ben-Cohen {
252166d2f6aSOhad Ben-Cohen unsigned long flags;
253166d2f6aSOhad Ben-Cohen struct ll_struct *ll = hu->priv;
254166d2f6aSOhad Ben-Cohen
255166d2f6aSOhad Ben-Cohen BT_DBG("hu %p", hu);
256166d2f6aSOhad Ben-Cohen
257166d2f6aSOhad Ben-Cohen /* lock hcill state */
258166d2f6aSOhad Ben-Cohen spin_lock_irqsave(&ll->hcill_lock, flags);
259166d2f6aSOhad Ben-Cohen
260166d2f6aSOhad Ben-Cohen /* sanity check */
261166d2f6aSOhad Ben-Cohen if (ll->hcill_state != HCILL_AWAKE)
26282b7d856SFabian Schindlatz BT_ERR("ERR: HCILL_GO_TO_SLEEP_IND in state %ld",
26382b7d856SFabian Schindlatz ll->hcill_state);
264166d2f6aSOhad Ben-Cohen
265166d2f6aSOhad Ben-Cohen /* acknowledge device sleep */
266166d2f6aSOhad Ben-Cohen if (send_hcill_cmd(HCILL_GO_TO_SLEEP_ACK, hu) < 0) {
267166d2f6aSOhad Ben-Cohen BT_ERR("cannot acknowledge device sleep");
268166d2f6aSOhad Ben-Cohen goto out;
269166d2f6aSOhad Ben-Cohen }
270166d2f6aSOhad Ben-Cohen
271166d2f6aSOhad Ben-Cohen /* update state */
272166d2f6aSOhad Ben-Cohen ll->hcill_state = HCILL_ASLEEP;
273166d2f6aSOhad Ben-Cohen
274166d2f6aSOhad Ben-Cohen out:
275166d2f6aSOhad Ben-Cohen spin_unlock_irqrestore(&ll->hcill_lock, flags);
276166d2f6aSOhad Ben-Cohen
277166d2f6aSOhad Ben-Cohen /* actually send the sleep ack packet */
278166d2f6aSOhad Ben-Cohen hci_uart_tx_wakeup(hu);
279166d2f6aSOhad Ben-Cohen }
280166d2f6aSOhad Ben-Cohen
281166d2f6aSOhad Ben-Cohen /*
282166d2f6aSOhad Ben-Cohen * Called upon wake-up-acknowledgement from the device
283166d2f6aSOhad Ben-Cohen */
ll_device_woke_up(struct hci_uart * hu)284166d2f6aSOhad Ben-Cohen static void ll_device_woke_up(struct hci_uart *hu)
285166d2f6aSOhad Ben-Cohen {
286166d2f6aSOhad Ben-Cohen unsigned long flags;
287166d2f6aSOhad Ben-Cohen struct ll_struct *ll = hu->priv;
288166d2f6aSOhad Ben-Cohen
289166d2f6aSOhad Ben-Cohen BT_DBG("hu %p", hu);
290166d2f6aSOhad Ben-Cohen
291166d2f6aSOhad Ben-Cohen /* lock hcill state */
292166d2f6aSOhad Ben-Cohen spin_lock_irqsave(&ll->hcill_lock, flags);
293166d2f6aSOhad Ben-Cohen
294166d2f6aSOhad Ben-Cohen /* sanity check */
295166d2f6aSOhad Ben-Cohen if (ll->hcill_state != HCILL_ASLEEP_TO_AWAKE)
29682b7d856SFabian Schindlatz BT_ERR("received HCILL_WAKE_UP_ACK in state %ld",
29782b7d856SFabian Schindlatz ll->hcill_state);
298166d2f6aSOhad Ben-Cohen
299166d2f6aSOhad Ben-Cohen /* send pending packets and change state to HCILL_AWAKE */
300166d2f6aSOhad Ben-Cohen __ll_do_awake(ll);
301166d2f6aSOhad Ben-Cohen
302166d2f6aSOhad Ben-Cohen spin_unlock_irqrestore(&ll->hcill_lock, flags);
303166d2f6aSOhad Ben-Cohen
304166d2f6aSOhad Ben-Cohen /* actually send the packets */
305166d2f6aSOhad Ben-Cohen hci_uart_tx_wakeup(hu);
306166d2f6aSOhad Ben-Cohen }
307166d2f6aSOhad Ben-Cohen
308166d2f6aSOhad Ben-Cohen /* Enqueue frame for transmittion (padding, crc, etc) */
309166d2f6aSOhad Ben-Cohen /* may be called from two simultaneous tasklets */
ll_enqueue(struct hci_uart * hu,struct sk_buff * skb)310166d2f6aSOhad Ben-Cohen static int ll_enqueue(struct hci_uart *hu, struct sk_buff *skb)
311166d2f6aSOhad Ben-Cohen {
312166d2f6aSOhad Ben-Cohen unsigned long flags = 0;
313166d2f6aSOhad Ben-Cohen struct ll_struct *ll = hu->priv;
314166d2f6aSOhad Ben-Cohen
315166d2f6aSOhad Ben-Cohen BT_DBG("hu %p skb %p", hu, skb);
316166d2f6aSOhad Ben-Cohen
317166d2f6aSOhad Ben-Cohen /* Prepend skb with frame type */
318618e8bc2SMarcel Holtmann memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
319166d2f6aSOhad Ben-Cohen
320166d2f6aSOhad Ben-Cohen /* lock hcill state */
321166d2f6aSOhad Ben-Cohen spin_lock_irqsave(&ll->hcill_lock, flags);
322166d2f6aSOhad Ben-Cohen
323166d2f6aSOhad Ben-Cohen /* act according to current state */
324166d2f6aSOhad Ben-Cohen switch (ll->hcill_state) {
325166d2f6aSOhad Ben-Cohen case HCILL_AWAKE:
326166d2f6aSOhad Ben-Cohen BT_DBG("device awake, sending normally");
327166d2f6aSOhad Ben-Cohen skb_queue_tail(&ll->txq, skb);
328166d2f6aSOhad Ben-Cohen break;
329166d2f6aSOhad Ben-Cohen case HCILL_ASLEEP:
330166d2f6aSOhad Ben-Cohen BT_DBG("device asleep, waking up and queueing packet");
331166d2f6aSOhad Ben-Cohen /* save packet for later */
332166d2f6aSOhad Ben-Cohen skb_queue_tail(&ll->tx_wait_q, skb);
333166d2f6aSOhad Ben-Cohen /* awake device */
334166d2f6aSOhad Ben-Cohen if (send_hcill_cmd(HCILL_WAKE_UP_IND, hu) < 0) {
335166d2f6aSOhad Ben-Cohen BT_ERR("cannot wake up device");
336166d2f6aSOhad Ben-Cohen break;
337166d2f6aSOhad Ben-Cohen }
338166d2f6aSOhad Ben-Cohen ll->hcill_state = HCILL_ASLEEP_TO_AWAKE;
339166d2f6aSOhad Ben-Cohen break;
340166d2f6aSOhad Ben-Cohen case HCILL_ASLEEP_TO_AWAKE:
341166d2f6aSOhad Ben-Cohen BT_DBG("device waking up, queueing packet");
342166d2f6aSOhad Ben-Cohen /* transient state; just keep packet for later */
343166d2f6aSOhad Ben-Cohen skb_queue_tail(&ll->tx_wait_q, skb);
344166d2f6aSOhad Ben-Cohen break;
345166d2f6aSOhad Ben-Cohen default:
34682b7d856SFabian Schindlatz BT_ERR("illegal hcill state: %ld (losing packet)",
34782b7d856SFabian Schindlatz ll->hcill_state);
3488f458f78SYang Yingliang dev_kfree_skb_irq(skb);
349166d2f6aSOhad Ben-Cohen break;
350166d2f6aSOhad Ben-Cohen }
351166d2f6aSOhad Ben-Cohen
352166d2f6aSOhad Ben-Cohen spin_unlock_irqrestore(&ll->hcill_lock, flags);
353166d2f6aSOhad Ben-Cohen
354166d2f6aSOhad Ben-Cohen return 0;
355166d2f6aSOhad Ben-Cohen }
356166d2f6aSOhad Ben-Cohen
ll_recv_frame(struct hci_dev * hdev,struct sk_buff * skb)357f9d7c8fdSMarcel Holtmann static int ll_recv_frame(struct hci_dev *hdev, struct sk_buff *skb)
358166d2f6aSOhad Ben-Cohen {
359f9d7c8fdSMarcel Holtmann struct hci_uart *hu = hci_get_drvdata(hdev);
360f9d7c8fdSMarcel Holtmann struct ll_struct *ll = hu->priv;
361166d2f6aSOhad Ben-Cohen
362f9d7c8fdSMarcel Holtmann switch (hci_skb_pkt_type(skb)) {
363f9d7c8fdSMarcel Holtmann case HCILL_GO_TO_SLEEP_IND:
364f9d7c8fdSMarcel Holtmann BT_DBG("HCILL_GO_TO_SLEEP_IND packet");
365f9d7c8fdSMarcel Holtmann ll_device_want_to_sleep(hu);
366f9d7c8fdSMarcel Holtmann break;
367f9d7c8fdSMarcel Holtmann case HCILL_GO_TO_SLEEP_ACK:
368f9d7c8fdSMarcel Holtmann /* shouldn't happen */
369f9d7c8fdSMarcel Holtmann bt_dev_err(hdev, "received HCILL_GO_TO_SLEEP_ACK in state %ld",
370f9d7c8fdSMarcel Holtmann ll->hcill_state);
371f9d7c8fdSMarcel Holtmann break;
372f9d7c8fdSMarcel Holtmann case HCILL_WAKE_UP_IND:
373f9d7c8fdSMarcel Holtmann BT_DBG("HCILL_WAKE_UP_IND packet");
374f9d7c8fdSMarcel Holtmann ll_device_want_to_wakeup(hu);
375f9d7c8fdSMarcel Holtmann break;
376f9d7c8fdSMarcel Holtmann case HCILL_WAKE_UP_ACK:
377f9d7c8fdSMarcel Holtmann BT_DBG("HCILL_WAKE_UP_ACK packet");
378f9d7c8fdSMarcel Holtmann ll_device_woke_up(hu);
379f9d7c8fdSMarcel Holtmann break;
380166d2f6aSOhad Ben-Cohen }
381166d2f6aSOhad Ben-Cohen
382f9d7c8fdSMarcel Holtmann kfree_skb(skb);
383166d2f6aSOhad Ben-Cohen return 0;
384166d2f6aSOhad Ben-Cohen }
385166d2f6aSOhad Ben-Cohen
386f9d7c8fdSMarcel Holtmann #define LL_RECV_SLEEP_IND \
387f9d7c8fdSMarcel Holtmann .type = HCILL_GO_TO_SLEEP_IND, \
388f9d7c8fdSMarcel Holtmann .hlen = 0, \
389f9d7c8fdSMarcel Holtmann .loff = 0, \
390f9d7c8fdSMarcel Holtmann .lsize = 0, \
391f9d7c8fdSMarcel Holtmann .maxlen = 0
392f9d7c8fdSMarcel Holtmann
393f9d7c8fdSMarcel Holtmann #define LL_RECV_SLEEP_ACK \
394f9d7c8fdSMarcel Holtmann .type = HCILL_GO_TO_SLEEP_ACK, \
395f9d7c8fdSMarcel Holtmann .hlen = 0, \
396f9d7c8fdSMarcel Holtmann .loff = 0, \
397f9d7c8fdSMarcel Holtmann .lsize = 0, \
398f9d7c8fdSMarcel Holtmann .maxlen = 0
399f9d7c8fdSMarcel Holtmann
400f9d7c8fdSMarcel Holtmann #define LL_RECV_WAKE_IND \
401f9d7c8fdSMarcel Holtmann .type = HCILL_WAKE_UP_IND, \
402f9d7c8fdSMarcel Holtmann .hlen = 0, \
403f9d7c8fdSMarcel Holtmann .loff = 0, \
404f9d7c8fdSMarcel Holtmann .lsize = 0, \
405f9d7c8fdSMarcel Holtmann .maxlen = 0
406f9d7c8fdSMarcel Holtmann
407f9d7c8fdSMarcel Holtmann #define LL_RECV_WAKE_ACK \
408f9d7c8fdSMarcel Holtmann .type = HCILL_WAKE_UP_ACK, \
409f9d7c8fdSMarcel Holtmann .hlen = 0, \
410f9d7c8fdSMarcel Holtmann .loff = 0, \
411f9d7c8fdSMarcel Holtmann .lsize = 0, \
412f9d7c8fdSMarcel Holtmann .maxlen = 0
413f9d7c8fdSMarcel Holtmann
414f9d7c8fdSMarcel Holtmann static const struct h4_recv_pkt ll_recv_pkts[] = {
415f9d7c8fdSMarcel Holtmann { H4_RECV_ACL, .recv = hci_recv_frame },
416f9d7c8fdSMarcel Holtmann { H4_RECV_SCO, .recv = hci_recv_frame },
417f9d7c8fdSMarcel Holtmann { H4_RECV_EVENT, .recv = hci_recv_frame },
418f9d7c8fdSMarcel Holtmann { LL_RECV_SLEEP_IND, .recv = ll_recv_frame },
419f9d7c8fdSMarcel Holtmann { LL_RECV_SLEEP_ACK, .recv = ll_recv_frame },
420f9d7c8fdSMarcel Holtmann { LL_RECV_WAKE_IND, .recv = ll_recv_frame },
421f9d7c8fdSMarcel Holtmann { LL_RECV_WAKE_ACK, .recv = ll_recv_frame },
422f9d7c8fdSMarcel Holtmann };
423f9d7c8fdSMarcel Holtmann
424166d2f6aSOhad Ben-Cohen /* Recv data */
ll_recv(struct hci_uart * hu,const void * data,int count)4259d1c40ebSMarcel Holtmann static int ll_recv(struct hci_uart *hu, const void *data, int count)
426166d2f6aSOhad Ben-Cohen {
427166d2f6aSOhad Ben-Cohen struct ll_struct *ll = hu->priv;
428166d2f6aSOhad Ben-Cohen
429f9d7c8fdSMarcel Holtmann if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
430f9d7c8fdSMarcel Holtmann return -EUNATCH;
431166d2f6aSOhad Ben-Cohen
432f9d7c8fdSMarcel Holtmann ll->rx_skb = h4_recv_buf(hu->hdev, ll->rx_skb, data, count,
433f9d7c8fdSMarcel Holtmann ll_recv_pkts, ARRAY_SIZE(ll_recv_pkts));
434f9d7c8fdSMarcel Holtmann if (IS_ERR(ll->rx_skb)) {
435f9d7c8fdSMarcel Holtmann int err = PTR_ERR(ll->rx_skb);
436f9d7c8fdSMarcel Holtmann bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
437166d2f6aSOhad Ben-Cohen ll->rx_skb = NULL;
438f9d7c8fdSMarcel Holtmann return err;
439166d2f6aSOhad Ben-Cohen }
440166d2f6aSOhad Ben-Cohen
441166d2f6aSOhad Ben-Cohen return count;
442166d2f6aSOhad Ben-Cohen }
443166d2f6aSOhad Ben-Cohen
ll_dequeue(struct hci_uart * hu)444166d2f6aSOhad Ben-Cohen static struct sk_buff *ll_dequeue(struct hci_uart *hu)
445166d2f6aSOhad Ben-Cohen {
446166d2f6aSOhad Ben-Cohen struct ll_struct *ll = hu->priv;
44782b7d856SFabian Schindlatz
448166d2f6aSOhad Ben-Cohen return skb_dequeue(&ll->txq);
449166d2f6aSOhad Ben-Cohen }
450166d2f6aSOhad Ben-Cohen
45137180552SRob Herring #if IS_ENABLED(CONFIG_SERIAL_DEV_BUS)
read_local_version(struct hci_dev * hdev)45237180552SRob Herring static int read_local_version(struct hci_dev *hdev)
45337180552SRob Herring {
45437180552SRob Herring int err = 0;
45537180552SRob Herring unsigned short version = 0;
45637180552SRob Herring struct sk_buff *skb;
45737180552SRob Herring struct hci_rp_read_local_version *ver;
45837180552SRob Herring
45982b7d856SFabian Schindlatz skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL,
46082b7d856SFabian Schindlatz HCI_INIT_TIMEOUT);
46137180552SRob Herring if (IS_ERR(skb)) {
46237180552SRob Herring bt_dev_err(hdev, "Reading TI version information failed (%ld)",
46337180552SRob Herring PTR_ERR(skb));
464f2edd9f6SSebastian Reichel return PTR_ERR(skb);
46537180552SRob Herring }
46637180552SRob Herring if (skb->len != sizeof(*ver)) {
46737180552SRob Herring err = -EILSEQ;
46837180552SRob Herring goto out;
46937180552SRob Herring }
47037180552SRob Herring
47137180552SRob Herring ver = (struct hci_rp_read_local_version *)skb->data;
47237180552SRob Herring if (le16_to_cpu(ver->manufacturer) != 13) {
47337180552SRob Herring err = -ENODEV;
47437180552SRob Herring goto out;
47537180552SRob Herring }
47637180552SRob Herring
47737180552SRob Herring version = le16_to_cpu(ver->lmp_subver);
47837180552SRob Herring
47937180552SRob Herring out:
48082b7d856SFabian Schindlatz if (err)
48182b7d856SFabian Schindlatz bt_dev_err(hdev, "Failed to read TI version info: %d", err);
48237180552SRob Herring kfree_skb(skb);
48337180552SRob Herring return err ? err : version;
48437180552SRob Herring }
48537180552SRob Herring
send_command_from_firmware(struct ll_device * lldev,struct hci_command * cmd)4866322f377SFabian Schindlatz static int send_command_from_firmware(struct ll_device *lldev,
4876322f377SFabian Schindlatz struct hci_command *cmd)
4886322f377SFabian Schindlatz {
4896322f377SFabian Schindlatz struct sk_buff *skb;
4906322f377SFabian Schindlatz
4916322f377SFabian Schindlatz if (cmd->opcode == HCI_VS_UPDATE_UART_HCI_BAUDRATE) {
4926322f377SFabian Schindlatz /* ignore remote change
4936322f377SFabian Schindlatz * baud rate HCI VS command
4946322f377SFabian Schindlatz */
4956322f377SFabian Schindlatz bt_dev_warn(lldev->hu.hdev,
4966322f377SFabian Schindlatz "change remote baud rate command in firmware");
4976322f377SFabian Schindlatz return 0;
4986322f377SFabian Schindlatz }
4996322f377SFabian Schindlatz if (cmd->prefix != 1)
5006322f377SFabian Schindlatz bt_dev_dbg(lldev->hu.hdev, "command type %d", cmd->prefix);
5016322f377SFabian Schindlatz
5026322f377SFabian Schindlatz skb = __hci_cmd_sync(lldev->hu.hdev, cmd->opcode, cmd->plen,
5036322f377SFabian Schindlatz &cmd->speed, HCI_INIT_TIMEOUT);
5046322f377SFabian Schindlatz if (IS_ERR(skb)) {
5056322f377SFabian Schindlatz bt_dev_err(lldev->hu.hdev, "send command failed");
5066322f377SFabian Schindlatz return PTR_ERR(skb);
5076322f377SFabian Schindlatz }
5086322f377SFabian Schindlatz kfree_skb(skb);
5096322f377SFabian Schindlatz return 0;
5106322f377SFabian Schindlatz }
5116322f377SFabian Schindlatz
512a86974f7STedd Ho-Jeong An /*
51337180552SRob Herring * download_firmware -
51437180552SRob Herring * internal function which parses through the .bts firmware
51537180552SRob Herring * script file intreprets SEND, DELAY actions only as of now
51637180552SRob Herring */
download_firmware(struct ll_device * lldev)51737180552SRob Herring static int download_firmware(struct ll_device *lldev)
51837180552SRob Herring {
51937180552SRob Herring unsigned short chip, min_ver, maj_ver;
52037180552SRob Herring int version, err, len;
52137180552SRob Herring unsigned char *ptr, *action_ptr;
52237180552SRob Herring unsigned char bts_scr_name[40]; /* 40 char long bts scr name? */
52337180552SRob Herring const struct firmware *fw;
52437180552SRob Herring struct hci_command *cmd;
52537180552SRob Herring
52637180552SRob Herring version = read_local_version(lldev->hu.hdev);
52737180552SRob Herring if (version < 0)
52837180552SRob Herring return version;
52937180552SRob Herring
53037180552SRob Herring chip = (version & 0x7C00) >> 10;
53137180552SRob Herring min_ver = (version & 0x007F);
53237180552SRob Herring maj_ver = (version & 0x0380) >> 7;
53337180552SRob Herring if (version & 0x8000)
53437180552SRob Herring maj_ver |= 0x0008;
53537180552SRob Herring
53637180552SRob Herring snprintf(bts_scr_name, sizeof(bts_scr_name),
53737180552SRob Herring "ti-connectivity/TIInit_%d.%d.%d.bts",
53837180552SRob Herring chip, maj_ver, min_ver);
53937180552SRob Herring
54037180552SRob Herring err = request_firmware(&fw, bts_scr_name, &lldev->serdev->dev);
54137180552SRob Herring if (err || !fw->data || !fw->size) {
54237180552SRob Herring bt_dev_err(lldev->hu.hdev, "request_firmware failed(errno %d) for %s",
54337180552SRob Herring err, bts_scr_name);
54437180552SRob Herring return -EINVAL;
54537180552SRob Herring }
54637180552SRob Herring ptr = (void *)fw->data;
54737180552SRob Herring len = fw->size;
54837180552SRob Herring /* bts_header to remove out magic number and
54937180552SRob Herring * version
55037180552SRob Herring */
55137180552SRob Herring ptr += sizeof(struct bts_header);
55237180552SRob Herring len -= sizeof(struct bts_header);
55337180552SRob Herring
55437180552SRob Herring while (len > 0 && ptr) {
55537180552SRob Herring bt_dev_dbg(lldev->hu.hdev, " action size %d, type %d ",
55637180552SRob Herring ((struct bts_action *)ptr)->size,
55737180552SRob Herring ((struct bts_action *)ptr)->type);
55837180552SRob Herring
55937180552SRob Herring action_ptr = &(((struct bts_action *)ptr)->data[0]);
56037180552SRob Herring
56137180552SRob Herring switch (((struct bts_action *)ptr)->type) {
56237180552SRob Herring case ACTION_SEND_COMMAND: /* action send */
56337180552SRob Herring bt_dev_dbg(lldev->hu.hdev, "S");
56437180552SRob Herring cmd = (struct hci_command *)action_ptr;
5656322f377SFabian Schindlatz err = send_command_from_firmware(lldev, cmd);
5666322f377SFabian Schindlatz if (err)
56737180552SRob Herring goto out_rel_fw;
56837180552SRob Herring break;
56937180552SRob Herring case ACTION_WAIT_EVENT: /* wait */
57037180552SRob Herring /* no need to wait as command was synchronous */
57137180552SRob Herring bt_dev_dbg(lldev->hu.hdev, "W");
57237180552SRob Herring break;
57337180552SRob Herring case ACTION_DELAY: /* sleep */
57437180552SRob Herring bt_dev_info(lldev->hu.hdev, "sleep command in scr");
57506633ee1SJia-Ju Bai msleep(((struct bts_action_delay *)action_ptr)->msec);
57637180552SRob Herring break;
57737180552SRob Herring }
57837180552SRob Herring len -= (sizeof(struct bts_action) +
57937180552SRob Herring ((struct bts_action *)ptr)->size);
58037180552SRob Herring ptr += sizeof(struct bts_action) +
58137180552SRob Herring ((struct bts_action *)ptr)->size;
58237180552SRob Herring }
58337180552SRob Herring
58437180552SRob Herring out_rel_fw:
58537180552SRob Herring /* fw download complete */
58637180552SRob Herring release_firmware(fw);
58737180552SRob Herring return err;
58837180552SRob Herring }
58937180552SRob Herring
ll_set_bdaddr(struct hci_dev * hdev,const bdaddr_t * bdaddr)590aa099398SDavid Lechner static int ll_set_bdaddr(struct hci_dev *hdev, const bdaddr_t *bdaddr)
591aa099398SDavid Lechner {
592aa099398SDavid Lechner bdaddr_t bdaddr_swapped;
593aa099398SDavid Lechner struct sk_buff *skb;
594aa099398SDavid Lechner
595aa099398SDavid Lechner /* HCI_VS_WRITE_BD_ADDR (at least on a CC2560A chip) expects the BD
596aa099398SDavid Lechner * address to be MSB first, but bdaddr_t has the convention of being
597aa099398SDavid Lechner * LSB first.
598aa099398SDavid Lechner */
599aa099398SDavid Lechner baswap(&bdaddr_swapped, bdaddr);
600aa099398SDavid Lechner skb = __hci_cmd_sync(hdev, HCI_VS_WRITE_BD_ADDR, sizeof(bdaddr_t),
601aa099398SDavid Lechner &bdaddr_swapped, HCI_INIT_TIMEOUT);
602aa099398SDavid Lechner if (!IS_ERR(skb))
603aa099398SDavid Lechner kfree_skb(skb);
604aa099398SDavid Lechner
605aa099398SDavid Lechner return PTR_ERR_OR_ZERO(skb);
606aa099398SDavid Lechner }
607aa099398SDavid Lechner
ll_setup(struct hci_uart * hu)60837180552SRob Herring static int ll_setup(struct hci_uart *hu)
60937180552SRob Herring {
61037180552SRob Herring int err, retry = 3;
61137180552SRob Herring struct ll_device *lldev;
61237180552SRob Herring struct serdev_device *serdev = hu->serdev;
61337180552SRob Herring u32 speed;
61437180552SRob Herring
61537180552SRob Herring if (!serdev)
61637180552SRob Herring return 0;
61737180552SRob Herring
61837180552SRob Herring lldev = serdev_device_get_drvdata(serdev);
61937180552SRob Herring
620aa099398SDavid Lechner hu->hdev->set_bdaddr = ll_set_bdaddr;
621aa099398SDavid Lechner
62237180552SRob Herring serdev_device_set_flow_control(serdev, true);
62337180552SRob Herring
62437180552SRob Herring do {
625d54fdcf9SDavid Lechner /* Reset the Bluetooth device */
62637180552SRob Herring gpiod_set_value_cansleep(lldev->enable_gpio, 0);
62737180552SRob Herring msleep(5);
62837180552SRob Herring gpiod_set_value_cansleep(lldev->enable_gpio, 1);
629844c79bdSXiaolei Wang mdelay(100);
630d54fdcf9SDavid Lechner err = serdev_device_wait_for_cts(serdev, true, 200);
631d54fdcf9SDavid Lechner if (err) {
632d54fdcf9SDavid Lechner bt_dev_err(hu->hdev, "Failed to get CTS");
633d54fdcf9SDavid Lechner return err;
634d54fdcf9SDavid Lechner }
63537180552SRob Herring
63637180552SRob Herring err = download_firmware(lldev);
63737180552SRob Herring if (!err)
63837180552SRob Herring break;
63937180552SRob Herring
64037180552SRob Herring /* Toggle BT_EN and retry */
64137180552SRob Herring bt_dev_err(hu->hdev, "download firmware failed, retrying...");
64237180552SRob Herring } while (retry--);
64337180552SRob Herring
64437180552SRob Herring if (err)
64537180552SRob Herring return err;
64637180552SRob Herring
6470e58d0cdSDavid Lechner /* Set BD address if one was specified at probe */
6480e58d0cdSDavid Lechner if (!bacmp(&lldev->bdaddr, BDADDR_NONE)) {
6490e58d0cdSDavid Lechner /* This means that there was an error getting the BD address
6500e58d0cdSDavid Lechner * during probe, so mark the device as having a bad address.
6510e58d0cdSDavid Lechner */
6520e58d0cdSDavid Lechner set_bit(HCI_QUIRK_INVALID_BDADDR, &hu->hdev->quirks);
6530e58d0cdSDavid Lechner } else if (bacmp(&lldev->bdaddr, BDADDR_ANY)) {
6540e58d0cdSDavid Lechner err = ll_set_bdaddr(hu->hdev, &lldev->bdaddr);
6550e58d0cdSDavid Lechner if (err)
6560e58d0cdSDavid Lechner set_bit(HCI_QUIRK_INVALID_BDADDR, &hu->hdev->quirks);
6570e58d0cdSDavid Lechner }
6580e58d0cdSDavid Lechner
65937180552SRob Herring /* Operational speed if any */
660cef456cdSAdam Ford if (hu->oper_speed)
661cef456cdSAdam Ford speed = hu->oper_speed;
662cef456cdSAdam Ford else if (hu->proto->oper_speed)
663cef456cdSAdam Ford speed = hu->proto->oper_speed;
664cef456cdSAdam Ford else
665cef456cdSAdam Ford speed = 0;
66637180552SRob Herring
667cef456cdSAdam Ford if (speed) {
668cef456cdSAdam Ford __le32 speed_le = cpu_to_le32(speed);
669cef456cdSAdam Ford struct sk_buff *skb;
670cef456cdSAdam Ford
671cef456cdSAdam Ford skb = __hci_cmd_sync(hu->hdev, HCI_VS_UPDATE_UART_HCI_BAUDRATE,
672cef456cdSAdam Ford sizeof(speed_le), &speed_le,
673cef456cdSAdam Ford HCI_INIT_TIMEOUT);
674cef456cdSAdam Ford if (!IS_ERR(skb)) {
675cef456cdSAdam Ford kfree_skb(skb);
676cef456cdSAdam Ford serdev_device_set_baudrate(serdev, speed);
677cef456cdSAdam Ford }
678cef456cdSAdam Ford }
67937180552SRob Herring
68037180552SRob Herring return 0;
68137180552SRob Herring }
68237180552SRob Herring
68337180552SRob Herring static const struct hci_uart_proto llp;
68437180552SRob Herring
hci_ti_probe(struct serdev_device * serdev)68537180552SRob Herring static int hci_ti_probe(struct serdev_device *serdev)
68637180552SRob Herring {
68737180552SRob Herring struct hci_uart *hu;
68837180552SRob Herring struct ll_device *lldev;
6890e58d0cdSDavid Lechner struct nvmem_cell *bdaddr_cell;
69037180552SRob Herring u32 max_speed = 3000000;
69137180552SRob Herring
69237180552SRob Herring lldev = devm_kzalloc(&serdev->dev, sizeof(struct ll_device), GFP_KERNEL);
69337180552SRob Herring if (!lldev)
69437180552SRob Herring return -ENOMEM;
69537180552SRob Herring hu = &lldev->hu;
69637180552SRob Herring
69737180552SRob Herring serdev_device_set_drvdata(serdev, lldev);
69837180552SRob Herring lldev->serdev = hu->serdev = serdev;
69937180552SRob Herring
70082b7d856SFabian Schindlatz lldev->enable_gpio = devm_gpiod_get_optional(&serdev->dev,
70182b7d856SFabian Schindlatz "enable",
70282b7d856SFabian Schindlatz GPIOD_OUT_LOW);
70337180552SRob Herring if (IS_ERR(lldev->enable_gpio))
70437180552SRob Herring return PTR_ERR(lldev->enable_gpio);
70537180552SRob Herring
70643d3d092SUlf Hansson lldev->ext_clk = devm_clk_get(&serdev->dev, "ext_clock");
70743d3d092SUlf Hansson if (IS_ERR(lldev->ext_clk) && PTR_ERR(lldev->ext_clk) != -ENOENT)
70843d3d092SUlf Hansson return PTR_ERR(lldev->ext_clk);
70943d3d092SUlf Hansson
71037180552SRob Herring of_property_read_u32(serdev->dev.of_node, "max-speed", &max_speed);
71137180552SRob Herring hci_uart_set_speeds(hu, 115200, max_speed);
71237180552SRob Herring
7130e58d0cdSDavid Lechner /* optional BD address from nvram */
7140e58d0cdSDavid Lechner bdaddr_cell = nvmem_cell_get(&serdev->dev, "bd-address");
7150e58d0cdSDavid Lechner if (IS_ERR(bdaddr_cell)) {
7160e58d0cdSDavid Lechner int err = PTR_ERR(bdaddr_cell);
7170e58d0cdSDavid Lechner
7180e58d0cdSDavid Lechner if (err == -EPROBE_DEFER)
7190e58d0cdSDavid Lechner return err;
7200e58d0cdSDavid Lechner
7210e58d0cdSDavid Lechner /* ENOENT means there is no matching nvmem cell and ENOSYS
7220e58d0cdSDavid Lechner * means that nvmem is not enabled in the kernel configuration.
7230e58d0cdSDavid Lechner */
7240e58d0cdSDavid Lechner if (err != -ENOENT && err != -ENOSYS) {
7250e58d0cdSDavid Lechner /* If there was some other error, give userspace a
7260e58d0cdSDavid Lechner * chance to fix the problem instead of failing to load
7270e58d0cdSDavid Lechner * the driver. Using BDADDR_NONE as a flag that is
7280e58d0cdSDavid Lechner * tested later in the setup function.
7290e58d0cdSDavid Lechner */
7300e58d0cdSDavid Lechner dev_warn(&serdev->dev,
7310e58d0cdSDavid Lechner "Failed to get \"bd-address\" nvmem cell (%d)\n",
7320e58d0cdSDavid Lechner err);
7330e58d0cdSDavid Lechner bacpy(&lldev->bdaddr, BDADDR_NONE);
7340e58d0cdSDavid Lechner }
7350e58d0cdSDavid Lechner } else {
7360e58d0cdSDavid Lechner bdaddr_t *bdaddr;
7370e58d0cdSDavid Lechner size_t len;
7380e58d0cdSDavid Lechner
7390e58d0cdSDavid Lechner bdaddr = nvmem_cell_read(bdaddr_cell, &len);
7400e58d0cdSDavid Lechner nvmem_cell_put(bdaddr_cell);
7410e58d0cdSDavid Lechner if (IS_ERR(bdaddr)) {
7420e58d0cdSDavid Lechner dev_err(&serdev->dev, "Failed to read nvmem bd-address\n");
7430e58d0cdSDavid Lechner return PTR_ERR(bdaddr);
7440e58d0cdSDavid Lechner }
7450e58d0cdSDavid Lechner if (len != sizeof(bdaddr_t)) {
7460e58d0cdSDavid Lechner dev_err(&serdev->dev, "Invalid nvmem bd-address length\n");
7470e58d0cdSDavid Lechner kfree(bdaddr);
7480e58d0cdSDavid Lechner return -EINVAL;
7490e58d0cdSDavid Lechner }
7500e58d0cdSDavid Lechner
7510e58d0cdSDavid Lechner /* As per the device tree bindings, the value from nvmem is
7520e58d0cdSDavid Lechner * expected to be MSB first, but in the kernel it is expected
7530e58d0cdSDavid Lechner * that bdaddr_t is LSB first.
7540e58d0cdSDavid Lechner */
7550e58d0cdSDavid Lechner baswap(&lldev->bdaddr, bdaddr);
7560e58d0cdSDavid Lechner kfree(bdaddr);
7570e58d0cdSDavid Lechner }
7580e58d0cdSDavid Lechner
75937180552SRob Herring return hci_uart_register_device(hu, &llp);
76037180552SRob Herring }
76137180552SRob Herring
hci_ti_remove(struct serdev_device * serdev)76237180552SRob Herring static void hci_ti_remove(struct serdev_device *serdev)
76337180552SRob Herring {
76437180552SRob Herring struct ll_device *lldev = serdev_device_get_drvdata(serdev);
76537180552SRob Herring
76637f5258dSIan Molton hci_uart_unregister_device(&lldev->hu);
76737180552SRob Herring }
76837180552SRob Herring
76937180552SRob Herring static const struct of_device_id hci_ti_of_match[] = {
7704166493cSDavid Lechner { .compatible = "ti,cc2560" },
771c127a871SSebastian Reichel { .compatible = "ti,wl1271-st" },
772c127a871SSebastian Reichel { .compatible = "ti,wl1273-st" },
773c127a871SSebastian Reichel { .compatible = "ti,wl1281-st" },
774c127a871SSebastian Reichel { .compatible = "ti,wl1283-st" },
775c127a871SSebastian Reichel { .compatible = "ti,wl1285-st" },
776c127a871SSebastian Reichel { .compatible = "ti,wl1801-st" },
777c127a871SSebastian Reichel { .compatible = "ti,wl1805-st" },
778c127a871SSebastian Reichel { .compatible = "ti,wl1807-st" },
77937180552SRob Herring { .compatible = "ti,wl1831-st" },
78037180552SRob Herring { .compatible = "ti,wl1835-st" },
78137180552SRob Herring { .compatible = "ti,wl1837-st" },
78237180552SRob Herring {},
78337180552SRob Herring };
78437180552SRob Herring MODULE_DEVICE_TABLE(of, hci_ti_of_match);
78537180552SRob Herring
78637180552SRob Herring static struct serdev_device_driver hci_ti_drv = {
78737180552SRob Herring .driver = {
78837180552SRob Herring .name = "hci-ti",
789*cd97d47fSKrzysztof Kozlowski .of_match_table = hci_ti_of_match,
79037180552SRob Herring },
79137180552SRob Herring .probe = hci_ti_probe,
79237180552SRob Herring .remove = hci_ti_remove,
79337180552SRob Herring };
79437180552SRob Herring #else
79537180552SRob Herring #define ll_setup NULL
79637180552SRob Herring #endif
79737180552SRob Herring
7984ee7ef19SMarcel Holtmann static const struct hci_uart_proto llp = {
799166d2f6aSOhad Ben-Cohen .id = HCI_UART_LL,
8007c40fb8dSMarcel Holtmann .name = "LL",
80137180552SRob Herring .setup = ll_setup,
802166d2f6aSOhad Ben-Cohen .open = ll_open,
803166d2f6aSOhad Ben-Cohen .close = ll_close,
804166d2f6aSOhad Ben-Cohen .recv = ll_recv,
805166d2f6aSOhad Ben-Cohen .enqueue = ll_enqueue,
806166d2f6aSOhad Ben-Cohen .dequeue = ll_dequeue,
807166d2f6aSOhad Ben-Cohen .flush = ll_flush,
808166d2f6aSOhad Ben-Cohen };
809166d2f6aSOhad Ben-Cohen
ll_init(void)810f2b94bb9SGustavo F. Padovan int __init ll_init(void)
811166d2f6aSOhad Ben-Cohen {
81237180552SRob Herring serdev_device_driver_register(&hci_ti_drv);
81337180552SRob Herring
81401009eecSMarcel Holtmann return hci_uart_register_proto(&llp);
815166d2f6aSOhad Ben-Cohen }
816166d2f6aSOhad Ben-Cohen
ll_deinit(void)817f2b94bb9SGustavo F. Padovan int __exit ll_deinit(void)
818166d2f6aSOhad Ben-Cohen {
81937180552SRob Herring serdev_device_driver_unregister(&hci_ti_drv);
82037180552SRob Herring
821166d2f6aSOhad Ben-Cohen return hci_uart_unregister_proto(&llp);
822166d2f6aSOhad Ben-Cohen }
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