diff options
Diffstat (limited to 'drivers/bluetooth/btmtksdio.c')
| -rw-r--r-- | drivers/bluetooth/btmtksdio.c | 1503 |
1 files changed, 1503 insertions, 0 deletions
diff --git a/drivers/bluetooth/btmtksdio.c b/drivers/bluetooth/btmtksdio.c new file mode 100644 index 000000000..f9a344475 --- /dev/null +++ b/drivers/bluetooth/btmtksdio.c @@ -0,0 +1,1503 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (c) 2019 MediaTek Inc. + +/* + * Bluetooth support for MediaTek SDIO devices + * + * This file is written based on btsdio.c and btmtkuart.c. + * + * Author: Sean Wang <sean.wang@mediatek.com> + * + */ + +#include <asm/unaligned.h> +#include <linux/atomic.h> +#include <linux/gpio/consumer.h> +#include <linux/init.h> +#include <linux/iopoll.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/pm_runtime.h> +#include <linux/skbuff.h> + +#include <linux/mmc/host.h> +#include <linux/mmc/sdio_ids.h> +#include <linux/mmc/sdio_func.h> + +#include <net/bluetooth/bluetooth.h> +#include <net/bluetooth/hci_core.h> + +#include "h4_recv.h" +#include "btmtk.h" + +#define VERSION "0.1" + +#define MTKBTSDIO_AUTOSUSPEND_DELAY 1000 + +static bool enable_autosuspend = true; + +struct btmtksdio_data { + const char *fwname; + u16 chipid; + bool lp_mbox_supported; +}; + +static const struct btmtksdio_data mt7663_data = { + .fwname = FIRMWARE_MT7663, + .chipid = 0x7663, + .lp_mbox_supported = false, +}; + +static const struct btmtksdio_data mt7668_data = { + .fwname = FIRMWARE_MT7668, + .chipid = 0x7668, + .lp_mbox_supported = false, +}; + +static const struct btmtksdio_data mt7921_data = { + .fwname = FIRMWARE_MT7961, + .chipid = 0x7921, + .lp_mbox_supported = true, +}; + +static const struct sdio_device_id btmtksdio_table[] = { + {SDIO_DEVICE(SDIO_VENDOR_ID_MEDIATEK, SDIO_DEVICE_ID_MEDIATEK_MT7663), + .driver_data = (kernel_ulong_t)&mt7663_data }, + {SDIO_DEVICE(SDIO_VENDOR_ID_MEDIATEK, SDIO_DEVICE_ID_MEDIATEK_MT7668), + .driver_data = (kernel_ulong_t)&mt7668_data }, + {SDIO_DEVICE(SDIO_VENDOR_ID_MEDIATEK, SDIO_DEVICE_ID_MEDIATEK_MT7961), + .driver_data = (kernel_ulong_t)&mt7921_data }, + { } /* Terminating entry */ +}; +MODULE_DEVICE_TABLE(sdio, btmtksdio_table); + +#define MTK_REG_CHLPCR 0x4 /* W1S */ +#define C_INT_EN_SET BIT(0) +#define C_INT_EN_CLR BIT(1) +#define C_FW_OWN_REQ_SET BIT(8) /* For write */ +#define C_COM_DRV_OWN BIT(8) /* For read */ +#define C_FW_OWN_REQ_CLR BIT(9) + +#define MTK_REG_CSDIOCSR 0x8 +#define SDIO_RE_INIT_EN BIT(0) +#define SDIO_INT_CTL BIT(2) + +#define MTK_REG_CHCR 0xc +#define C_INT_CLR_CTRL BIT(1) +#define BT_RST_DONE BIT(8) + +/* CHISR have the same bits field definition with CHIER */ +#define MTK_REG_CHISR 0x10 +#define MTK_REG_CHIER 0x14 +#define FW_OWN_BACK_INT BIT(0) +#define RX_DONE_INT BIT(1) +#define TX_EMPTY BIT(2) +#define TX_FIFO_OVERFLOW BIT(8) +#define FW_MAILBOX_INT BIT(15) +#define INT_MASK GENMASK(15, 0) +#define RX_PKT_LEN GENMASK(31, 16) + +#define MTK_REG_CSICR 0xc0 +#define CSICR_CLR_MBOX_ACK BIT(0) +#define MTK_REG_PH2DSM0R 0xc4 +#define PH2DSM0R_DRIVER_OWN BIT(0) +#define MTK_REG_PD2HRM0R 0xdc +#define PD2HRM0R_DRV_OWN BIT(0) + +#define MTK_REG_CTDR 0x18 + +#define MTK_REG_CRDR 0x1c + +#define MTK_REG_CRPLR 0x24 + +#define MTK_SDIO_BLOCK_SIZE 256 + +#define BTMTKSDIO_TX_WAIT_VND_EVT 1 +#define BTMTKSDIO_HW_TX_READY 2 +#define BTMTKSDIO_FUNC_ENABLED 3 +#define BTMTKSDIO_PATCH_ENABLED 4 +#define BTMTKSDIO_HW_RESET_ACTIVE 5 + +struct mtkbtsdio_hdr { + __le16 len; + __le16 reserved; + u8 bt_type; +} __packed; + +struct btmtksdio_dev { + struct hci_dev *hdev; + struct sdio_func *func; + struct device *dev; + + struct work_struct txrx_work; + unsigned long tx_state; + struct sk_buff_head txq; + + struct sk_buff *evt_skb; + + const struct btmtksdio_data *data; + + struct gpio_desc *reset; +}; + +static int mtk_hci_wmt_sync(struct hci_dev *hdev, + struct btmtk_hci_wmt_params *wmt_params) +{ + struct btmtksdio_dev *bdev = hci_get_drvdata(hdev); + struct btmtk_hci_wmt_evt_funcc *wmt_evt_funcc; + struct btmtk_hci_wmt_evt_reg *wmt_evt_reg; + u32 hlen, status = BTMTK_WMT_INVALID; + struct btmtk_hci_wmt_evt *wmt_evt; + struct btmtk_hci_wmt_cmd *wc; + struct btmtk_wmt_hdr *hdr; + int err; + + /* Send the WMT command and wait until the WMT event returns */ + hlen = sizeof(*hdr) + wmt_params->dlen; + if (hlen > 255) + return -EINVAL; + + wc = kzalloc(hlen, GFP_KERNEL); + if (!wc) + return -ENOMEM; + + hdr = &wc->hdr; + hdr->dir = 1; + hdr->op = wmt_params->op; + hdr->dlen = cpu_to_le16(wmt_params->dlen + 1); + hdr->flag = wmt_params->flag; + memcpy(wc->data, wmt_params->data, wmt_params->dlen); + + set_bit(BTMTKSDIO_TX_WAIT_VND_EVT, &bdev->tx_state); + + err = __hci_cmd_send(hdev, 0xfc6f, hlen, wc); + if (err < 0) { + clear_bit(BTMTKSDIO_TX_WAIT_VND_EVT, &bdev->tx_state); + goto err_free_wc; + } + + /* The vendor specific WMT commands are all answered by a vendor + * specific event and will not have the Command Status or Command + * Complete as with usual HCI command flow control. + * + * After sending the command, wait for BTMTKSDIO_TX_WAIT_VND_EVT + * state to be cleared. The driver specific event receive routine + * will clear that state and with that indicate completion of the + * WMT command. + */ + err = wait_on_bit_timeout(&bdev->tx_state, BTMTKSDIO_TX_WAIT_VND_EVT, + TASK_INTERRUPTIBLE, HCI_INIT_TIMEOUT); + if (err == -EINTR) { + bt_dev_err(hdev, "Execution of wmt command interrupted"); + clear_bit(BTMTKSDIO_TX_WAIT_VND_EVT, &bdev->tx_state); + goto err_free_wc; + } + + if (err) { + bt_dev_err(hdev, "Execution of wmt command timed out"); + clear_bit(BTMTKSDIO_TX_WAIT_VND_EVT, &bdev->tx_state); + err = -ETIMEDOUT; + goto err_free_wc; + } + + /* Parse and handle the return WMT event */ + wmt_evt = (struct btmtk_hci_wmt_evt *)bdev->evt_skb->data; + if (wmt_evt->whdr.op != hdr->op) { + bt_dev_err(hdev, "Wrong op received %d expected %d", + wmt_evt->whdr.op, hdr->op); + err = -EIO; + goto err_free_skb; + } + + switch (wmt_evt->whdr.op) { + case BTMTK_WMT_SEMAPHORE: + if (wmt_evt->whdr.flag == 2) + status = BTMTK_WMT_PATCH_UNDONE; + else + status = BTMTK_WMT_PATCH_DONE; + break; + case BTMTK_WMT_FUNC_CTRL: + wmt_evt_funcc = (struct btmtk_hci_wmt_evt_funcc *)wmt_evt; + if (be16_to_cpu(wmt_evt_funcc->status) == 0x404) + status = BTMTK_WMT_ON_DONE; + else if (be16_to_cpu(wmt_evt_funcc->status) == 0x420) + status = BTMTK_WMT_ON_PROGRESS; + else + status = BTMTK_WMT_ON_UNDONE; + break; + case BTMTK_WMT_PATCH_DWNLD: + if (wmt_evt->whdr.flag == 2) + status = BTMTK_WMT_PATCH_DONE; + else if (wmt_evt->whdr.flag == 1) + status = BTMTK_WMT_PATCH_PROGRESS; + else + status = BTMTK_WMT_PATCH_UNDONE; + break; + case BTMTK_WMT_REGISTER: + wmt_evt_reg = (struct btmtk_hci_wmt_evt_reg *)wmt_evt; + if (le16_to_cpu(wmt_evt->whdr.dlen) == 12) + status = le32_to_cpu(wmt_evt_reg->val); + break; + } + + if (wmt_params->status) + *wmt_params->status = status; + +err_free_skb: + kfree_skb(bdev->evt_skb); + bdev->evt_skb = NULL; +err_free_wc: + kfree(wc); + + return err; +} + +static int btmtksdio_tx_packet(struct btmtksdio_dev *bdev, + struct sk_buff *skb) +{ + struct mtkbtsdio_hdr *sdio_hdr; + int err; + + /* Make sure that there are enough rooms for SDIO header */ + if (unlikely(skb_headroom(skb) < sizeof(*sdio_hdr))) { + err = pskb_expand_head(skb, sizeof(*sdio_hdr), 0, + GFP_ATOMIC); + if (err < 0) + return err; + } + + /* Prepend MediaTek SDIO Specific Header */ + skb_push(skb, sizeof(*sdio_hdr)); + + sdio_hdr = (void *)skb->data; + sdio_hdr->len = cpu_to_le16(skb->len); + sdio_hdr->reserved = cpu_to_le16(0); + sdio_hdr->bt_type = hci_skb_pkt_type(skb); + + clear_bit(BTMTKSDIO_HW_TX_READY, &bdev->tx_state); + err = sdio_writesb(bdev->func, MTK_REG_CTDR, skb->data, + round_up(skb->len, MTK_SDIO_BLOCK_SIZE)); + if (err < 0) + goto err_skb_pull; + + bdev->hdev->stat.byte_tx += skb->len; + + kfree_skb(skb); + + return 0; + +err_skb_pull: + skb_pull(skb, sizeof(*sdio_hdr)); + + return err; +} + +static u32 btmtksdio_drv_own_query(struct btmtksdio_dev *bdev) +{ + return sdio_readl(bdev->func, MTK_REG_CHLPCR, NULL); +} + +static u32 btmtksdio_drv_own_query_79xx(struct btmtksdio_dev *bdev) +{ + return sdio_readl(bdev->func, MTK_REG_PD2HRM0R, NULL); +} + +static u32 btmtksdio_chcr_query(struct btmtksdio_dev *bdev) +{ + return sdio_readl(bdev->func, MTK_REG_CHCR, NULL); +} + +static int btmtksdio_fw_pmctrl(struct btmtksdio_dev *bdev) +{ + u32 status; + int err; + + sdio_claim_host(bdev->func); + + if (bdev->data->lp_mbox_supported && + test_bit(BTMTKSDIO_PATCH_ENABLED, &bdev->tx_state)) { + sdio_writel(bdev->func, CSICR_CLR_MBOX_ACK, MTK_REG_CSICR, + &err); + err = readx_poll_timeout(btmtksdio_drv_own_query_79xx, bdev, + status, !(status & PD2HRM0R_DRV_OWN), + 2000, 1000000); + if (err < 0) { + bt_dev_err(bdev->hdev, "mailbox ACK not cleared"); + goto out; + } + } + + /* Return ownership to the device */ + sdio_writel(bdev->func, C_FW_OWN_REQ_SET, MTK_REG_CHLPCR, &err); + if (err < 0) + goto out; + + err = readx_poll_timeout(btmtksdio_drv_own_query, bdev, status, + !(status & C_COM_DRV_OWN), 2000, 1000000); + +out: + sdio_release_host(bdev->func); + + if (err < 0) + bt_dev_err(bdev->hdev, "Cannot return ownership to device"); + + return err; +} + +static int btmtksdio_drv_pmctrl(struct btmtksdio_dev *bdev) +{ + u32 status; + int err; + + sdio_claim_host(bdev->func); + + /* Get ownership from the device */ + sdio_writel(bdev->func, C_FW_OWN_REQ_CLR, MTK_REG_CHLPCR, &err); + if (err < 0) + goto out; + + err = readx_poll_timeout(btmtksdio_drv_own_query, bdev, status, + status & C_COM_DRV_OWN, 2000, 1000000); + + if (!err && bdev->data->lp_mbox_supported && + test_bit(BTMTKSDIO_PATCH_ENABLED, &bdev->tx_state)) + err = readx_poll_timeout(btmtksdio_drv_own_query_79xx, bdev, + status, status & PD2HRM0R_DRV_OWN, + 2000, 1000000); + +out: + sdio_release_host(bdev->func); + + if (err < 0) + bt_dev_err(bdev->hdev, "Cannot get ownership from device"); + + return err; +} + +static int btmtksdio_recv_event(struct hci_dev *hdev, struct sk_buff *skb) +{ + struct btmtksdio_dev *bdev = hci_get_drvdata(hdev); + struct hci_event_hdr *hdr = (void *)skb->data; + u8 evt = hdr->evt; + int err; + + /* When someone waits for the WMT event, the skb is being cloned + * and being processed the events from there then. + */ + if (test_bit(BTMTKSDIO_TX_WAIT_VND_EVT, &bdev->tx_state)) { + bdev->evt_skb = skb_clone(skb, GFP_KERNEL); + if (!bdev->evt_skb) { + err = -ENOMEM; + goto err_out; + } + } + + err = hci_recv_frame(hdev, skb); + if (err < 0) + goto err_free_skb; + + if (evt == HCI_EV_WMT) { + if (test_and_clear_bit(BTMTKSDIO_TX_WAIT_VND_EVT, + &bdev->tx_state)) { + /* Barrier to sync with other CPUs */ + smp_mb__after_atomic(); + wake_up_bit(&bdev->tx_state, BTMTKSDIO_TX_WAIT_VND_EVT); + } + } + + return 0; + +err_free_skb: + kfree_skb(bdev->evt_skb); + bdev->evt_skb = NULL; + +err_out: + return err; +} + +static int btmtksdio_recv_acl(struct hci_dev *hdev, struct sk_buff *skb) +{ + struct btmtksdio_dev *bdev = hci_get_drvdata(hdev); + u16 handle = le16_to_cpu(hci_acl_hdr(skb)->handle); + + switch (handle) { + case 0xfc6f: + /* Firmware dump from device: when the firmware hangs, the + * device can no longer suspend and thus disable auto-suspend. + */ + pm_runtime_forbid(bdev->dev); + fallthrough; + case 0x05ff: + case 0x05fe: + /* Firmware debug logging */ + return hci_recv_diag(hdev, skb); + } + + return hci_recv_frame(hdev, skb); +} + +static const struct h4_recv_pkt mtk_recv_pkts[] = { + { H4_RECV_ACL, .recv = btmtksdio_recv_acl }, + { H4_RECV_SCO, .recv = hci_recv_frame }, + { H4_RECV_EVENT, .recv = btmtksdio_recv_event }, +}; + +static int btmtksdio_rx_packet(struct btmtksdio_dev *bdev, u16 rx_size) +{ + const struct h4_recv_pkt *pkts = mtk_recv_pkts; + int pkts_count = ARRAY_SIZE(mtk_recv_pkts); + struct mtkbtsdio_hdr *sdio_hdr; + int err, i, pad_size; + struct sk_buff *skb; + u16 dlen; + + if (rx_size < sizeof(*sdio_hdr)) + return -EILSEQ; + + /* A SDIO packet is exactly containing a Bluetooth packet */ + skb = bt_skb_alloc(rx_size, GFP_KERNEL); + if (!skb) + return -ENOMEM; + + skb_put(skb, rx_size); + + err = sdio_readsb(bdev->func, skb->data, MTK_REG_CRDR, rx_size); + if (err < 0) + goto err_kfree_skb; + + sdio_hdr = (void *)skb->data; + + /* We assume the default error as -EILSEQ simply to make the error path + * be cleaner. + */ + err = -EILSEQ; + + if (rx_size != le16_to_cpu(sdio_hdr->len)) { + bt_dev_err(bdev->hdev, "Rx size in sdio header is mismatched "); + goto err_kfree_skb; + } + + hci_skb_pkt_type(skb) = sdio_hdr->bt_type; + + /* Remove MediaTek SDIO header */ + skb_pull(skb, sizeof(*sdio_hdr)); + + /* We have to dig into the packet to get payload size and then know how + * many padding bytes at the tail, these padding bytes should be removed + * before the packet is indicated to the core layer. + */ + for (i = 0; i < pkts_count; i++) { + if (sdio_hdr->bt_type == (&pkts[i])->type) + break; + } + + if (i >= pkts_count) { + bt_dev_err(bdev->hdev, "Invalid bt type 0x%02x", + sdio_hdr->bt_type); + goto err_kfree_skb; + } + + /* Remaining bytes cannot hold a header*/ + if (skb->len < (&pkts[i])->hlen) { + bt_dev_err(bdev->hdev, "The size of bt header is mismatched"); + goto err_kfree_skb; + } + + switch ((&pkts[i])->lsize) { + case 1: + dlen = skb->data[(&pkts[i])->loff]; + break; + case 2: + dlen = get_unaligned_le16(skb->data + + (&pkts[i])->loff); + break; + default: + goto err_kfree_skb; + } + + pad_size = skb->len - (&pkts[i])->hlen - dlen; + + /* Remaining bytes cannot hold a payload */ + if (pad_size < 0) { + bt_dev_err(bdev->hdev, "The size of bt payload is mismatched"); + goto err_kfree_skb; + } + + /* Remove padding bytes */ + skb_trim(skb, skb->len - pad_size); + + /* Complete frame */ + (&pkts[i])->recv(bdev->hdev, skb); + + bdev->hdev->stat.byte_rx += rx_size; + + return 0; + +err_kfree_skb: + kfree_skb(skb); + + return err; +} + +static void btmtksdio_txrx_work(struct work_struct *work) +{ + struct btmtksdio_dev *bdev = container_of(work, struct btmtksdio_dev, + txrx_work); + unsigned long txrx_timeout; + u32 int_status, rx_size; + struct sk_buff *skb; + int err; + + pm_runtime_get_sync(bdev->dev); + + sdio_claim_host(bdev->func); + + /* Disable interrupt */ + sdio_writel(bdev->func, C_INT_EN_CLR, MTK_REG_CHLPCR, 0); + + txrx_timeout = jiffies + 5 * HZ; + + do { + int_status = sdio_readl(bdev->func, MTK_REG_CHISR, NULL); + + /* Ack an interrupt as soon as possible before any operation on + * hardware. + * + * Note that we don't ack any status during operations to avoid race + * condition between the host and the device such as it's possible to + * mistakenly ack RX_DONE for the next packet and then cause interrupts + * not be raised again but there is still pending data in the hardware + * FIFO. + */ + sdio_writel(bdev->func, int_status, MTK_REG_CHISR, NULL); + int_status &= INT_MASK; + + if ((int_status & FW_MAILBOX_INT) && + bdev->data->chipid == 0x7921) { + sdio_writel(bdev->func, PH2DSM0R_DRIVER_OWN, + MTK_REG_PH2DSM0R, 0); + } + + if (int_status & FW_OWN_BACK_INT) + bt_dev_dbg(bdev->hdev, "Get fw own back"); + + if (int_status & TX_EMPTY) + set_bit(BTMTKSDIO_HW_TX_READY, &bdev->tx_state); + + else if (unlikely(int_status & TX_FIFO_OVERFLOW)) + bt_dev_warn(bdev->hdev, "Tx fifo overflow"); + + if (test_bit(BTMTKSDIO_HW_TX_READY, &bdev->tx_state)) { + skb = skb_dequeue(&bdev->txq); + if (skb) { + err = btmtksdio_tx_packet(bdev, skb); + if (err < 0) { + bdev->hdev->stat.err_tx++; + skb_queue_head(&bdev->txq, skb); + } + } + } + + if (int_status & RX_DONE_INT) { + rx_size = sdio_readl(bdev->func, MTK_REG_CRPLR, NULL); + rx_size = (rx_size & RX_PKT_LEN) >> 16; + if (btmtksdio_rx_packet(bdev, rx_size) < 0) + bdev->hdev->stat.err_rx++; + } + } while (int_status || time_is_before_jiffies(txrx_timeout)); + + /* Enable interrupt */ + sdio_writel(bdev->func, C_INT_EN_SET, MTK_REG_CHLPCR, 0); + + sdio_release_host(bdev->func); + + pm_runtime_mark_last_busy(bdev->dev); + pm_runtime_put_autosuspend(bdev->dev); +} + +static void btmtksdio_interrupt(struct sdio_func *func) +{ + struct btmtksdio_dev *bdev = sdio_get_drvdata(func); + + /* Disable interrupt */ + sdio_writel(bdev->func, C_INT_EN_CLR, MTK_REG_CHLPCR, 0); + + schedule_work(&bdev->txrx_work); +} + +static int btmtksdio_open(struct hci_dev *hdev) +{ + struct btmtksdio_dev *bdev = hci_get_drvdata(hdev); + u32 val; + int err; + + sdio_claim_host(bdev->func); + + err = sdio_enable_func(bdev->func); + if (err < 0) + goto err_release_host; + + set_bit(BTMTKSDIO_FUNC_ENABLED, &bdev->tx_state); + + err = btmtksdio_drv_pmctrl(bdev); + if (err < 0) + goto err_disable_func; + + /* Disable interrupt & mask out all interrupt sources */ + sdio_writel(bdev->func, C_INT_EN_CLR, MTK_REG_CHLPCR, &err); + if (err < 0) + goto err_disable_func; + + sdio_writel(bdev->func, 0, MTK_REG_CHIER, &err); + if (err < 0) + goto err_disable_func; + + err = sdio_claim_irq(bdev->func, btmtksdio_interrupt); + if (err < 0) + goto err_disable_func; + + err = sdio_set_block_size(bdev->func, MTK_SDIO_BLOCK_SIZE); + if (err < 0) + goto err_release_irq; + + /* SDIO CMD 5 allows the SDIO device back to idle state an + * synchronous interrupt is supported in SDIO 4-bit mode + */ + val = sdio_readl(bdev->func, MTK_REG_CSDIOCSR, &err); + if (err < 0) + goto err_release_irq; + + val |= SDIO_INT_CTL; + sdio_writel(bdev->func, val, MTK_REG_CSDIOCSR, &err); + if (err < 0) + goto err_release_irq; + + /* Explitly set write-1-clear method */ + val = sdio_readl(bdev->func, MTK_REG_CHCR, &err); + if (err < 0) + goto err_release_irq; + + val |= C_INT_CLR_CTRL; + sdio_writel(bdev->func, val, MTK_REG_CHCR, &err); + if (err < 0) + goto err_release_irq; + + /* Setup interrupt sources */ + sdio_writel(bdev->func, RX_DONE_INT | TX_EMPTY | TX_FIFO_OVERFLOW, + MTK_REG_CHIER, &err); + if (err < 0) + goto err_release_irq; + + /* Enable interrupt */ + sdio_writel(bdev->func, C_INT_EN_SET, MTK_REG_CHLPCR, &err); + if (err < 0) + goto err_release_irq; + + sdio_release_host(bdev->func); + + return 0; + +err_release_irq: + sdio_release_irq(bdev->func); + +err_disable_func: + sdio_disable_func(bdev->func); + +err_release_host: + sdio_release_host(bdev->func); + + return err; +} + +static int btmtksdio_close(struct hci_dev *hdev) +{ + struct btmtksdio_dev *bdev = hci_get_drvdata(hdev); + + sdio_claim_host(bdev->func); + + /* Disable interrupt */ + sdio_writel(bdev->func, C_INT_EN_CLR, MTK_REG_CHLPCR, NULL); + + sdio_release_irq(bdev->func); + + cancel_work_sync(&bdev->txrx_work); + + btmtksdio_fw_pmctrl(bdev); + + clear_bit(BTMTKSDIO_FUNC_ENABLED, &bdev->tx_state); + sdio_disable_func(bdev->func); + + sdio_release_host(bdev->func); + + return 0; +} + +static int btmtksdio_flush(struct hci_dev *hdev) +{ + struct btmtksdio_dev *bdev = hci_get_drvdata(hdev); + + skb_queue_purge(&bdev->txq); + + cancel_work_sync(&bdev->txrx_work); + + return 0; +} + +static int btmtksdio_func_query(struct hci_dev *hdev) +{ + struct btmtk_hci_wmt_params wmt_params; + int status, err; + u8 param = 0; + + /* Query whether the function is enabled */ + wmt_params.op = BTMTK_WMT_FUNC_CTRL; + wmt_params.flag = 4; + wmt_params.dlen = sizeof(param); + wmt_params.data = ¶m; + wmt_params.status = &status; + + err = mtk_hci_wmt_sync(hdev, &wmt_params); + if (err < 0) { + bt_dev_err(hdev, "Failed to query function status (%d)", err); + return err; + } + + return status; +} + +static int mt76xx_setup(struct hci_dev *hdev, const char *fwname) +{ + struct btmtksdio_dev *bdev = hci_get_drvdata(hdev); + struct btmtk_hci_wmt_params wmt_params; + struct btmtk_tci_sleep tci_sleep; + struct sk_buff *skb; + int err, status; + u8 param = 0x1; + + /* Query whether the firmware is already download */ + wmt_params.op = BTMTK_WMT_SEMAPHORE; + wmt_params.flag = 1; + wmt_params.dlen = 0; + wmt_params.data = NULL; + wmt_params.status = &status; + + err = mtk_hci_wmt_sync(hdev, &wmt_params); + if (err < 0) { + bt_dev_err(hdev, "Failed to query firmware status (%d)", err); + return err; + } + + if (status == BTMTK_WMT_PATCH_DONE) { + bt_dev_info(hdev, "Firmware already downloaded"); + goto ignore_setup_fw; + } + + /* Setup a firmware which the device definitely requires */ + err = btmtk_setup_firmware(hdev, fwname, mtk_hci_wmt_sync); + if (err < 0) + return err; + +ignore_setup_fw: + /* Query whether the device is already enabled */ + err = readx_poll_timeout(btmtksdio_func_query, hdev, status, + status < 0 || status != BTMTK_WMT_ON_PROGRESS, + 2000, 5000000); + /* -ETIMEDOUT happens */ + if (err < 0) + return err; + + /* The other errors happen in btusb_mtk_func_query */ + if (status < 0) + return status; + + if (status == BTMTK_WMT_ON_DONE) { + bt_dev_info(hdev, "function already on"); + goto ignore_func_on; + } + + /* Enable Bluetooth protocol */ + wmt_params.op = BTMTK_WMT_FUNC_CTRL; + wmt_params.flag = 0; + wmt_params.dlen = sizeof(param); + wmt_params.data = ¶m; + wmt_params.status = NULL; + + err = mtk_hci_wmt_sync(hdev, &wmt_params); + if (err < 0) { + bt_dev_err(hdev, "Failed to send wmt func ctrl (%d)", err); + return err; + } + + set_bit(BTMTKSDIO_PATCH_ENABLED, &bdev->tx_state); + +ignore_func_on: + /* Apply the low power environment setup */ + tci_sleep.mode = 0x5; + tci_sleep.duration = cpu_to_le16(0x640); + tci_sleep.host_duration = cpu_to_le16(0x640); + tci_sleep.host_wakeup_pin = 0; + tci_sleep.time_compensation = 0; + + skb = __hci_cmd_sync(hdev, 0xfc7a, sizeof(tci_sleep), &tci_sleep, + HCI_INIT_TIMEOUT); + if (IS_ERR(skb)) { + err = PTR_ERR(skb); + bt_dev_err(hdev, "Failed to apply low power setting (%d)", err); + return err; + } + kfree_skb(skb); + + return 0; +} + +static int mt79xx_setup(struct hci_dev *hdev, const char *fwname) +{ + struct btmtksdio_dev *bdev = hci_get_drvdata(hdev); + struct btmtk_hci_wmt_params wmt_params; + u8 param = 0x1; + int err; + + err = btmtk_setup_firmware_79xx(hdev, fwname, mtk_hci_wmt_sync); + if (err < 0) { + bt_dev_err(hdev, "Failed to setup 79xx firmware (%d)", err); + return err; + } + + err = btmtksdio_fw_pmctrl(bdev); + if (err < 0) + return err; + + err = btmtksdio_drv_pmctrl(bdev); + if (err < 0) + return err; + + /* Enable Bluetooth protocol */ + wmt_params.op = BTMTK_WMT_FUNC_CTRL; + wmt_params.flag = 0; + wmt_params.dlen = sizeof(param); + wmt_params.data = ¶m; + wmt_params.status = NULL; + + err = mtk_hci_wmt_sync(hdev, &wmt_params); + if (err < 0) { + bt_dev_err(hdev, "Failed to send wmt func ctrl (%d)", err); + return err; + } + + hci_set_msft_opcode(hdev, 0xFD30); + hci_set_aosp_capable(hdev); + set_bit(BTMTKSDIO_PATCH_ENABLED, &bdev->tx_state); + + return err; +} + +static int btmtksdio_mtk_reg_read(struct hci_dev *hdev, u32 reg, u32 *val) +{ + struct btmtk_hci_wmt_params wmt_params; + struct reg_read_cmd reg_read = { + .type = 1, + .num = 1, + }; + u32 status; + int err; + + reg_read.addr = cpu_to_le32(reg); + wmt_params.op = BTMTK_WMT_REGISTER; + wmt_params.flag = BTMTK_WMT_REG_READ; + wmt_params.dlen = sizeof(reg_read); + wmt_params.data = ®_read; + wmt_params.status = &status; + + err = mtk_hci_wmt_sync(hdev, &wmt_params); + if (err < 0) { + bt_dev_err(hdev, "Failed to read reg (%d)", err); + return err; + } + + *val = status; + + return err; +} + +static int btmtksdio_mtk_reg_write(struct hci_dev *hdev, u32 reg, u32 val, u32 mask) +{ + struct btmtk_hci_wmt_params wmt_params; + const struct reg_write_cmd reg_write = { + .type = 1, + .num = 1, + .addr = cpu_to_le32(reg), + .data = cpu_to_le32(val), + .mask = cpu_to_le32(mask), + }; + int err, status; + + wmt_params.op = BTMTK_WMT_REGISTER; + wmt_params.flag = BTMTK_WMT_REG_WRITE; + wmt_params.dlen = sizeof(reg_write); + wmt_params.data = ®_write; + wmt_params.status = &status; + + err = mtk_hci_wmt_sync(hdev, &wmt_params); + if (err < 0) + bt_dev_err(hdev, "Failed to write reg (%d)", err); + + return err; +} + +static int btmtksdio_get_data_path_id(struct hci_dev *hdev, __u8 *data_path_id) +{ + /* uses 1 as data path id for all the usecases */ + *data_path_id = 1; + return 0; +} + +static int btmtksdio_get_codec_config_data(struct hci_dev *hdev, + __u8 link, struct bt_codec *codec, + __u8 *ven_len, __u8 **ven_data) +{ + int err = 0; + + if (!ven_data || !ven_len) + return -EINVAL; + + *ven_len = 0; + *ven_data = NULL; + + if (link != ESCO_LINK) { + bt_dev_err(hdev, "Invalid link type(%u)", link); + return -EINVAL; + } + + *ven_data = kmalloc(sizeof(__u8), GFP_KERNEL); + if (!*ven_data) { + err = -ENOMEM; + goto error; + } + + /* supports only CVSD and mSBC offload codecs */ + switch (codec->id) { + case 0x02: + **ven_data = 0x00; + break; + case 0x05: + **ven_data = 0x01; + break; + default: + err = -EINVAL; + bt_dev_err(hdev, "Invalid codec id(%u)", codec->id); + goto error; + } + /* codec and its capabilities are pre-defined to ids + * preset id = 0x00 represents CVSD codec with sampling rate 8K + * preset id = 0x01 represents mSBC codec with sampling rate 16K + */ + *ven_len = sizeof(__u8); + return err; + +error: + kfree(*ven_data); + *ven_data = NULL; + return err; +} + +static int btmtksdio_sco_setting(struct hci_dev *hdev) +{ + const struct btmtk_sco sco_setting = { + .clock_config = 0x49, + .channel_format_config = 0x80, + }; + struct sk_buff *skb; + u32 val; + int err; + + /* Enable SCO over I2S/PCM for MediaTek chipset */ + skb = __hci_cmd_sync(hdev, 0xfc72, sizeof(sco_setting), + &sco_setting, HCI_CMD_TIMEOUT); + if (IS_ERR(skb)) + return PTR_ERR(skb); + + kfree_skb(skb); + + err = btmtksdio_mtk_reg_read(hdev, MT7921_PINMUX_0, &val); + if (err < 0) + return err; + + val |= 0x11000000; + err = btmtksdio_mtk_reg_write(hdev, MT7921_PINMUX_0, val, ~0); + if (err < 0) + return err; + + err = btmtksdio_mtk_reg_read(hdev, MT7921_PINMUX_1, &val); + if (err < 0) + return err; + + val |= 0x00000101; + err = btmtksdio_mtk_reg_write(hdev, MT7921_PINMUX_1, val, ~0); + if (err < 0) + return err; + + hdev->get_data_path_id = btmtksdio_get_data_path_id; + hdev->get_codec_config_data = btmtksdio_get_codec_config_data; + + return err; +} + +static int btmtksdio_reset_setting(struct hci_dev *hdev) +{ + int err; + u32 val; + + err = btmtksdio_mtk_reg_read(hdev, MT7921_PINMUX_1, &val); + if (err < 0) + return err; + + val |= 0x20; /* set the pin (bit field 11:8) work as GPIO mode */ + err = btmtksdio_mtk_reg_write(hdev, MT7921_PINMUX_1, val, ~0); + if (err < 0) + return err; + + err = btmtksdio_mtk_reg_read(hdev, MT7921_BTSYS_RST, &val); + if (err < 0) + return err; + + val |= MT7921_BTSYS_RST_WITH_GPIO; + return btmtksdio_mtk_reg_write(hdev, MT7921_BTSYS_RST, val, ~0); +} + +static int btmtksdio_setup(struct hci_dev *hdev) +{ + struct btmtksdio_dev *bdev = hci_get_drvdata(hdev); + ktime_t calltime, delta, rettime; + unsigned long long duration; + char fwname[64]; + int err, dev_id; + u32 fw_version = 0, val; + + calltime = ktime_get(); + set_bit(BTMTKSDIO_HW_TX_READY, &bdev->tx_state); + + switch (bdev->data->chipid) { + case 0x7921: + if (test_bit(BTMTKSDIO_HW_RESET_ACTIVE, &bdev->tx_state)) { + err = btmtksdio_mtk_reg_read(hdev, MT7921_DLSTATUS, + &val); + if (err < 0) + return err; + + val &= ~BT_DL_STATE; + err = btmtksdio_mtk_reg_write(hdev, MT7921_DLSTATUS, + val, ~0); + if (err < 0) + return err; + + btmtksdio_fw_pmctrl(bdev); + msleep(20); + btmtksdio_drv_pmctrl(bdev); + + clear_bit(BTMTKSDIO_HW_RESET_ACTIVE, &bdev->tx_state); + } + + err = btmtksdio_mtk_reg_read(hdev, 0x70010200, &dev_id); + if (err < 0) { + bt_dev_err(hdev, "Failed to get device id (%d)", err); + return err; + } + + err = btmtksdio_mtk_reg_read(hdev, 0x80021004, &fw_version); + if (err < 0) { + bt_dev_err(hdev, "Failed to get fw version (%d)", err); + return err; + } + + snprintf(fwname, sizeof(fwname), + "mediatek/BT_RAM_CODE_MT%04x_1_%x_hdr.bin", + dev_id & 0xffff, (fw_version & 0xff) + 1); + err = mt79xx_setup(hdev, fwname); + if (err < 0) + return err; + + /* Enable SCO over I2S/PCM */ + err = btmtksdio_sco_setting(hdev); + if (err < 0) { + bt_dev_err(hdev, "Failed to enable SCO setting (%d)", err); + return err; + } + + /* Enable WBS with mSBC codec */ + set_bit(HCI_QUIRK_WIDEBAND_SPEECH_SUPPORTED, &hdev->quirks); + + /* Enable GPIO reset mechanism */ + if (bdev->reset) { + err = btmtksdio_reset_setting(hdev); + if (err < 0) { + bt_dev_err(hdev, "Failed to enable Reset setting (%d)", err); + devm_gpiod_put(bdev->dev, bdev->reset); + bdev->reset = NULL; + } + } + + /* Valid LE States quirk for MediaTek 7921 */ + set_bit(HCI_QUIRK_VALID_LE_STATES, &hdev->quirks); + + break; + case 0x7663: + case 0x7668: + err = mt76xx_setup(hdev, bdev->data->fwname); + if (err < 0) + return err; + break; + default: + return -ENODEV; + } + + rettime = ktime_get(); + delta = ktime_sub(rettime, calltime); + duration = (unsigned long long)ktime_to_ns(delta) >> 10; + + pm_runtime_set_autosuspend_delay(bdev->dev, + MTKBTSDIO_AUTOSUSPEND_DELAY); + pm_runtime_use_autosuspend(bdev->dev); + + err = pm_runtime_set_active(bdev->dev); + if (err < 0) + return err; + + /* Default forbid runtime auto suspend, that can be allowed by + * enable_autosuspend flag or the PM runtime entry under sysfs. + */ + pm_runtime_forbid(bdev->dev); + pm_runtime_enable(bdev->dev); + + if (enable_autosuspend) + pm_runtime_allow(bdev->dev); + + bt_dev_info(hdev, "Device setup in %llu usecs", duration); + + return 0; +} + +static int btmtksdio_shutdown(struct hci_dev *hdev) +{ + struct btmtksdio_dev *bdev = hci_get_drvdata(hdev); + struct btmtk_hci_wmt_params wmt_params; + u8 param = 0x0; + int err; + + /* Get back the state to be consistent with the state + * in btmtksdio_setup. + */ + pm_runtime_get_sync(bdev->dev); + + /* wmt command only works until the reset is complete */ + if (test_bit(BTMTKSDIO_HW_RESET_ACTIVE, &bdev->tx_state)) + goto ignore_wmt_cmd; + + /* Disable the device */ + wmt_params.op = BTMTK_WMT_FUNC_CTRL; + wmt_params.flag = 0; + wmt_params.dlen = sizeof(param); + wmt_params.data = ¶m; + wmt_params.status = NULL; + + err = mtk_hci_wmt_sync(hdev, &wmt_params); + if (err < 0) { + bt_dev_err(hdev, "Failed to send wmt func ctrl (%d)", err); + return err; + } + +ignore_wmt_cmd: + pm_runtime_put_noidle(bdev->dev); + pm_runtime_disable(bdev->dev); + + return 0; +} + +static int btmtksdio_send_frame(struct hci_dev *hdev, struct sk_buff *skb) +{ + struct btmtksdio_dev *bdev = hci_get_drvdata(hdev); + + switch (hci_skb_pkt_type(skb)) { + case HCI_COMMAND_PKT: + hdev->stat.cmd_tx++; + break; + + case HCI_ACLDATA_PKT: + hdev->stat.acl_tx++; + break; + + case HCI_SCODATA_PKT: + hdev->stat.sco_tx++; + break; + + default: + return -EILSEQ; + } + + skb_queue_tail(&bdev->txq, skb); + + schedule_work(&bdev->txrx_work); + + return 0; +} + +static void btmtksdio_cmd_timeout(struct hci_dev *hdev) +{ + struct btmtksdio_dev *bdev = hci_get_drvdata(hdev); + u32 status; + int err; + + if (!bdev->reset || bdev->data->chipid != 0x7921) + return; + + pm_runtime_get_sync(bdev->dev); + + if (test_and_set_bit(BTMTKSDIO_HW_RESET_ACTIVE, &bdev->tx_state)) + return; + + sdio_claim_host(bdev->func); + + sdio_writel(bdev->func, C_INT_EN_CLR, MTK_REG_CHLPCR, NULL); + skb_queue_purge(&bdev->txq); + cancel_work_sync(&bdev->txrx_work); + + gpiod_set_value_cansleep(bdev->reset, 1); + msleep(100); + gpiod_set_value_cansleep(bdev->reset, 0); + + err = readx_poll_timeout(btmtksdio_chcr_query, bdev, status, + status & BT_RST_DONE, 100000, 2000000); + if (err < 0) { + bt_dev_err(hdev, "Failed to reset (%d)", err); + goto err; + } + + clear_bit(BTMTKSDIO_PATCH_ENABLED, &bdev->tx_state); +err: + sdio_release_host(bdev->func); + + pm_runtime_put_noidle(bdev->dev); + pm_runtime_disable(bdev->dev); + + hci_reset_dev(hdev); +} + +static bool btmtksdio_sdio_inband_wakeup(struct hci_dev *hdev) +{ + struct btmtksdio_dev *bdev = hci_get_drvdata(hdev); + + return device_may_wakeup(bdev->dev); +} + +static bool btmtksdio_sdio_wakeup(struct hci_dev *hdev) +{ + struct btmtksdio_dev *bdev = hci_get_drvdata(hdev); + bool may_wakeup = device_may_wakeup(bdev->dev); + const struct btmtk_wakeon bt_awake = { + .mode = 0x1, + .gpo = 0, + .active_high = 0x1, + .enable_delay = cpu_to_le16(0xc80), + .wakeup_delay = cpu_to_le16(0x20), + }; + + if (may_wakeup && bdev->data->chipid == 0x7921) { + struct sk_buff *skb; + + skb = __hci_cmd_sync(hdev, 0xfc27, sizeof(bt_awake), + &bt_awake, HCI_CMD_TIMEOUT); + if (IS_ERR(skb)) + may_wakeup = false; + else + kfree_skb(skb); + } + + return may_wakeup; +} + +static int btmtksdio_probe(struct sdio_func *func, + const struct sdio_device_id *id) +{ + struct btmtksdio_dev *bdev; + struct hci_dev *hdev; + int err; + + bdev = devm_kzalloc(&func->dev, sizeof(*bdev), GFP_KERNEL); + if (!bdev) + return -ENOMEM; + + bdev->data = (void *)id->driver_data; + if (!bdev->data) + return -ENODEV; + + bdev->dev = &func->dev; + bdev->func = func; + + INIT_WORK(&bdev->txrx_work, btmtksdio_txrx_work); + skb_queue_head_init(&bdev->txq); + + /* Initialize and register HCI device */ + hdev = hci_alloc_dev(); + if (!hdev) { + dev_err(&func->dev, "Can't allocate HCI device\n"); + return -ENOMEM; + } + + bdev->hdev = hdev; + + hdev->bus = HCI_SDIO; + hci_set_drvdata(hdev, bdev); + + hdev->open = btmtksdio_open; + hdev->close = btmtksdio_close; + hdev->cmd_timeout = btmtksdio_cmd_timeout; + hdev->flush = btmtksdio_flush; + hdev->setup = btmtksdio_setup; + hdev->shutdown = btmtksdio_shutdown; + hdev->send = btmtksdio_send_frame; + hdev->wakeup = btmtksdio_sdio_wakeup; + /* + * If SDIO controller supports wake on Bluetooth, sending a wakeon + * command is not necessary. + */ + if (device_can_wakeup(func->card->host->parent)) + hdev->wakeup = btmtksdio_sdio_inband_wakeup; + else + hdev->wakeup = btmtksdio_sdio_wakeup; + hdev->set_bdaddr = btmtk_set_bdaddr; + + SET_HCIDEV_DEV(hdev, &func->dev); + + hdev->manufacturer = 70; + set_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks); + + sdio_set_drvdata(func, bdev); + + err = hci_register_dev(hdev); + if (err < 0) { + dev_err(&func->dev, "Can't register HCI device\n"); + hci_free_dev(hdev); + return err; + } + + /* pm_runtime_enable would be done after the firmware is being + * downloaded because the core layer probably already enables + * runtime PM for this func such as the case host->caps & + * MMC_CAP_POWER_OFF_CARD. + */ + if (pm_runtime_enabled(bdev->dev)) + pm_runtime_disable(bdev->dev); + + /* As explaination in drivers/mmc/core/sdio_bus.c tells us: + * Unbound SDIO functions are always suspended. + * During probe, the function is set active and the usage count + * is incremented. If the driver supports runtime PM, + * it should call pm_runtime_put_noidle() in its probe routine and + * pm_runtime_get_noresume() in its remove routine. + * + * So, put a pm_runtime_put_noidle here ! + */ + pm_runtime_put_noidle(bdev->dev); + + err = device_init_wakeup(bdev->dev, true); + if (err) + bt_dev_err(hdev, "failed to initialize device wakeup"); + + bdev->dev->of_node = of_find_compatible_node(NULL, NULL, + "mediatek,mt7921s-bluetooth"); + bdev->reset = devm_gpiod_get_optional(bdev->dev, "reset", + GPIOD_OUT_LOW); + if (IS_ERR(bdev->reset)) + err = PTR_ERR(bdev->reset); + + return err; +} + +static void btmtksdio_remove(struct sdio_func *func) +{ + struct btmtksdio_dev *bdev = sdio_get_drvdata(func); + struct hci_dev *hdev; + + if (!bdev) + return; + + /* Be consistent the state in btmtksdio_probe */ + pm_runtime_get_noresume(bdev->dev); + + hdev = bdev->hdev; + + sdio_set_drvdata(func, NULL); + hci_unregister_dev(hdev); + hci_free_dev(hdev); +} + +#ifdef CONFIG_PM +static int btmtksdio_runtime_suspend(struct device *dev) +{ + struct sdio_func *func = dev_to_sdio_func(dev); + struct btmtksdio_dev *bdev; + int err; + + bdev = sdio_get_drvdata(func); + if (!bdev) + return 0; + + if (!test_bit(BTMTKSDIO_FUNC_ENABLED, &bdev->tx_state)) + return 0; + + sdio_set_host_pm_flags(func, MMC_PM_KEEP_POWER); + + err = btmtksdio_fw_pmctrl(bdev); + + bt_dev_dbg(bdev->hdev, "status (%d) return ownership to device", err); + + return err; +} + +static int btmtksdio_runtime_resume(struct device *dev) +{ + struct sdio_func *func = dev_to_sdio_func(dev); + struct btmtksdio_dev *bdev; + int err; + + bdev = sdio_get_drvdata(func); + if (!bdev) + return 0; + + if (!test_bit(BTMTKSDIO_FUNC_ENABLED, &bdev->tx_state)) + return 0; + + err = btmtksdio_drv_pmctrl(bdev); + + bt_dev_dbg(bdev->hdev, "status (%d) get ownership from device", err); + + return err; +} + +static UNIVERSAL_DEV_PM_OPS(btmtksdio_pm_ops, btmtksdio_runtime_suspend, + btmtksdio_runtime_resume, NULL); +#define BTMTKSDIO_PM_OPS (&btmtksdio_pm_ops) +#else /* CONFIG_PM */ +#define BTMTKSDIO_PM_OPS NULL +#endif /* CONFIG_PM */ + +static struct sdio_driver btmtksdio_driver = { + .name = "btmtksdio", + .probe = btmtksdio_probe, + .remove = btmtksdio_remove, + .id_table = btmtksdio_table, + .drv = { + .owner = THIS_MODULE, + .pm = BTMTKSDIO_PM_OPS, + } +}; + +module_sdio_driver(btmtksdio_driver); + +module_param(enable_autosuspend, bool, 0644); +MODULE_PARM_DESC(enable_autosuspend, "Enable autosuspend by default"); + +MODULE_AUTHOR("Sean Wang <sean.wang@mediatek.com>"); +MODULE_DESCRIPTION("MediaTek Bluetooth SDIO driver ver " VERSION); +MODULE_VERSION(VERSION); +MODULE_LICENSE("GPL"); |