1 // SPDX-License-Identifier: GPL-2.0-or-later
4 * Generic Bluetooth SDIO driver
6 * Copyright (C) 2007 Cambridge Silicon Radio Ltd.
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/slab.h>
14 #include <linux/types.h>
15 #include <linux/sched.h>
16 #include <linux/errno.h>
17 #include <linux/skbuff.h>
19 #include <linux/mmc/host.h>
20 #include <linux/mmc/sdio_ids.h>
21 #include <linux/mmc/sdio_func.h>
23 #include <net/bluetooth/bluetooth.h>
24 #include <net/bluetooth/hci_core.h>
28 static const struct sdio_device_id btsdio_table[] = {
29 /* Generic Bluetooth Type-A SDIO device */
30 { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_A) },
32 /* Generic Bluetooth Type-B SDIO device */
33 { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_B) },
35 /* Generic Bluetooth AMP controller */
36 { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_AMP) },
38 { } /* Terminating entry */
41 MODULE_DEVICE_TABLE(sdio, btsdio_table);
45 struct sdio_func *func;
47 struct work_struct work;
49 struct sk_buff_head txq;
52 #define REG_RDAT 0x00 /* Receiver Data */
53 #define REG_TDAT 0x00 /* Transmitter Data */
54 #define REG_PC_RRT 0x10 /* Read Packet Control */
55 #define REG_PC_WRT 0x11 /* Write Packet Control */
56 #define REG_RTC_STAT 0x12 /* Retry Control Status */
57 #define REG_RTC_SET 0x12 /* Retry Control Set */
58 #define REG_INTRD 0x13 /* Interrupt Indication */
59 #define REG_CL_INTRD 0x13 /* Interrupt Clear */
60 #define REG_EN_INTRD 0x14 /* Interrupt Enable */
61 #define REG_MD_STAT 0x20 /* Bluetooth Mode Status */
62 #define REG_MD_SET 0x20 /* Bluetooth Mode Set */
64 static int btsdio_tx_packet(struct btsdio_data *data, struct sk_buff *skb)
68 BT_DBG("%s", data->hdev->name);
70 /* Prepend Type-A header */
72 skb->data[0] = (skb->len & 0x0000ff);
73 skb->data[1] = (skb->len & 0x00ff00) >> 8;
74 skb->data[2] = (skb->len & 0xff0000) >> 16;
75 skb->data[3] = hci_skb_pkt_type(skb);
77 err = sdio_writesb(data->func, REG_TDAT, skb->data, skb->len);
80 sdio_writeb(data->func, 0x01, REG_PC_WRT, NULL);
84 data->hdev->stat.byte_tx += skb->len;
91 static void btsdio_work(struct work_struct *work)
93 struct btsdio_data *data = container_of(work, struct btsdio_data, work);
97 BT_DBG("%s", data->hdev->name);
99 sdio_claim_host(data->func);
101 while ((skb = skb_dequeue(&data->txq))) {
102 err = btsdio_tx_packet(data, skb);
104 data->hdev->stat.err_tx++;
105 skb_queue_head(&data->txq, skb);
110 sdio_release_host(data->func);
113 static int btsdio_rx_packet(struct btsdio_data *data)
115 u8 hdr[4] __attribute__ ((aligned(4)));
119 BT_DBG("%s", data->hdev->name);
121 err = sdio_readsb(data->func, hdr, REG_RDAT, 4);
125 len = hdr[0] | (hdr[1] << 8) | (hdr[2] << 16);
126 if (len < 4 || len > 65543)
129 skb = bt_skb_alloc(len - 4, GFP_KERNEL);
131 /* Out of memory. Prepare a read retry and just
132 * return with the expectation that the next time
133 * we're called we'll have more memory.
138 skb_put(skb, len - 4);
140 err = sdio_readsb(data->func, skb->data, REG_RDAT, len - 4);
146 data->hdev->stat.byte_rx += len;
148 hci_skb_pkt_type(skb) = hdr[3];
150 err = hci_recv_frame(data->hdev, skb);
154 sdio_writeb(data->func, 0x00, REG_PC_RRT, NULL);
159 static void btsdio_interrupt(struct sdio_func *func)
161 struct btsdio_data *data = sdio_get_drvdata(func);
164 BT_DBG("%s", data->hdev->name);
166 intrd = sdio_readb(func, REG_INTRD, NULL);
168 sdio_writeb(func, 0x01, REG_CL_INTRD, NULL);
170 if (btsdio_rx_packet(data) < 0) {
171 data->hdev->stat.err_rx++;
172 sdio_writeb(data->func, 0x01, REG_PC_RRT, NULL);
177 static int btsdio_open(struct hci_dev *hdev)
179 struct btsdio_data *data = hci_get_drvdata(hdev);
182 BT_DBG("%s", hdev->name);
184 sdio_claim_host(data->func);
186 err = sdio_enable_func(data->func);
190 err = sdio_claim_irq(data->func, btsdio_interrupt);
192 sdio_disable_func(data->func);
196 if (data->func->class == SDIO_CLASS_BT_B)
197 sdio_writeb(data->func, 0x00, REG_MD_SET, NULL);
199 sdio_writeb(data->func, 0x01, REG_EN_INTRD, NULL);
202 sdio_release_host(data->func);
207 static int btsdio_close(struct hci_dev *hdev)
209 struct btsdio_data *data = hci_get_drvdata(hdev);
211 BT_DBG("%s", hdev->name);
213 sdio_claim_host(data->func);
215 sdio_writeb(data->func, 0x00, REG_EN_INTRD, NULL);
217 sdio_release_irq(data->func);
218 sdio_disable_func(data->func);
220 sdio_release_host(data->func);
225 static int btsdio_flush(struct hci_dev *hdev)
227 struct btsdio_data *data = hci_get_drvdata(hdev);
229 BT_DBG("%s", hdev->name);
231 skb_queue_purge(&data->txq);
236 static int btsdio_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
238 struct btsdio_data *data = hci_get_drvdata(hdev);
240 BT_DBG("%s", hdev->name);
242 switch (hci_skb_pkt_type(skb)) {
243 case HCI_COMMAND_PKT:
247 case HCI_ACLDATA_PKT:
251 case HCI_SCODATA_PKT:
259 skb_queue_tail(&data->txq, skb);
261 schedule_work(&data->work);
266 static int btsdio_probe(struct sdio_func *func,
267 const struct sdio_device_id *id)
269 struct btsdio_data *data;
270 struct hci_dev *hdev;
271 struct sdio_func_tuple *tuple = func->tuples;
274 BT_DBG("func %p id %p class 0x%04x", func, id, func->class);
277 BT_DBG("code 0x%x size %d", tuple->code, tuple->size);
281 /* Broadcom devices soldered onto the PCB (non-removable) use an
282 * UART connection for Bluetooth, ignore the BT SDIO interface.
284 if (func->vendor == SDIO_VENDOR_ID_BROADCOM &&
285 !mmc_card_is_removable(func->card->host)) {
286 switch (func->device) {
287 case SDIO_DEVICE_ID_BROADCOM_43341:
288 case SDIO_DEVICE_ID_BROADCOM_43430:
293 data = devm_kzalloc(&func->dev, sizeof(*data), GFP_KERNEL);
299 INIT_WORK(&data->work, btsdio_work);
301 skb_queue_head_init(&data->txq);
303 hdev = hci_alloc_dev();
307 hdev->bus = HCI_SDIO;
308 hci_set_drvdata(hdev, data);
310 if (id->class == SDIO_CLASS_BT_AMP)
311 hdev->dev_type = HCI_AMP;
313 hdev->dev_type = HCI_PRIMARY;
317 SET_HCIDEV_DEV(hdev, &func->dev);
319 hdev->open = btsdio_open;
320 hdev->close = btsdio_close;
321 hdev->flush = btsdio_flush;
322 hdev->send = btsdio_send_frame;
324 if (func->vendor == 0x0104 && func->device == 0x00c5)
325 set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
327 err = hci_register_dev(hdev);
333 sdio_set_drvdata(func, data);
338 static void btsdio_remove(struct sdio_func *func)
340 struct btsdio_data *data = sdio_get_drvdata(func);
341 struct hci_dev *hdev;
343 BT_DBG("func %p", func);
350 sdio_set_drvdata(func, NULL);
352 hci_unregister_dev(hdev);
357 static struct sdio_driver btsdio_driver = {
359 .probe = btsdio_probe,
360 .remove = btsdio_remove,
361 .id_table = btsdio_table,
364 module_sdio_driver(btsdio_driver);
367 MODULE_DESCRIPTION("Generic Bluetooth SDIO driver ver " VERSION);
368 MODULE_VERSION(VERSION);
369 MODULE_LICENSE("GPL");