// SPDX-License-Identifier: GPL-2.0-or-later /* * * Bluetooth support for Intel PCIe devices * * Copyright (C) 2024 Intel Corporation */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/firmware.h> #include <linux/pci.h> #include <linux/wait.h> #include <linux/delay.h> #include <linux/interrupt.h> #include <asm/unaligned.h> #include <net/bluetooth/bluetooth.h> #include <net/bluetooth/hci_core.h> #include "btintel.h" #include "btintel_pcie.h" #define VERSION … #define BTINTEL_PCI_DEVICE(dev, subdev) … #define POLL_INTERVAL_US … /* Intel Bluetooth PCIe device id table */ static const struct pci_device_id btintel_pcie_table[] = …; MODULE_DEVICE_TABLE(pci, btintel_pcie_table); /* Intel PCIe uses 4 bytes of HCI type instead of 1 byte BT SIG HCI type */ #define BTINTEL_PCIE_HCI_TYPE_LEN … #define BTINTEL_PCIE_HCI_CMD_PKT … #define BTINTEL_PCIE_HCI_ACL_PKT … #define BTINTEL_PCIE_HCI_SCO_PKT … #define BTINTEL_PCIE_HCI_EVT_PKT … static inline void ipc_print_ia_ring(struct hci_dev *hdev, struct ia *ia, u16 queue_num) { … } static inline void ipc_print_urbd1(struct hci_dev *hdev, struct urbd1 *urbd1, u16 index) { … } static int btintel_pcie_poll_bit(struct btintel_pcie_data *data, u32 offset, u32 bits, u32 mask, int timeout_us) { … } static struct btintel_pcie_data *btintel_pcie_get_data(struct msix_entry *entry) { … } /* Set the doorbell for TXQ to notify the device that @index (actually index-1) * of the TFD is updated and ready to transmit. */ static void btintel_pcie_set_tx_db(struct btintel_pcie_data *data, u16 index) { … } /* Copy the data to next(@tfd_index) data buffer and update the TFD(transfer * descriptor) with the data length and the DMA address of the data buffer. */ static void btintel_pcie_prepare_tx(struct txq *txq, u16 tfd_index, struct sk_buff *skb) { … } static int btintel_pcie_send_sync(struct btintel_pcie_data *data, struct sk_buff *skb) { … } /* Set the doorbell for RXQ to notify the device that @index (actually index-1) * is available to receive the data */ static void btintel_pcie_set_rx_db(struct btintel_pcie_data *data, u16 index) { … } /* Update the FRBD (free buffer descriptor) with the @frbd_index and the * DMA address of the free buffer. */ static void btintel_pcie_prepare_rx(struct rxq *rxq, u16 frbd_index) { … } static int btintel_pcie_submit_rx(struct btintel_pcie_data *data) { … } static int btintel_pcie_start_rx(struct btintel_pcie_data *data) { … } static void btintel_pcie_reset_ia(struct btintel_pcie_data *data) { … } static void btintel_pcie_reset_bt(struct btintel_pcie_data *data) { … } /* This function enables BT function by setting BTINTEL_PCIE_CSR_FUNC_CTRL_MAC_INIT bit in * BTINTEL_PCIE_CSR_FUNC_CTRL_REG register and wait for MSI-X with * BTINTEL_PCIE_MSIX_HW_INT_CAUSES_GP0. * Then the host reads firmware version from BTINTEL_CSR_F2D_MBX and the boot stage * from BTINTEL_PCIE_CSR_BOOT_STAGE_REG. */ static int btintel_pcie_enable_bt(struct btintel_pcie_data *data) { … } /* This function handles the MSI-X interrupt for gp0 cause (bit 0 in * BTINTEL_PCIE_CSR_MSIX_HW_INT_CAUSES) which is sent for boot stage and image response. */ static void btintel_pcie_msix_gp0_handler(struct btintel_pcie_data *data) { … } /* This function handles the MSX-X interrupt for rx queue 0 which is for TX */ static void btintel_pcie_msix_tx_handle(struct btintel_pcie_data *data) { … } /* Process the received rx data * It check the frame header to identify the data type and create skb * and calling HCI API */ static int btintel_pcie_recv_frame(struct btintel_pcie_data *data, struct sk_buff *skb) { … } static void btintel_pcie_rx_work(struct work_struct *work) { … } /* create sk_buff with data and save it to queue and start RX work */ static int btintel_pcie_submit_rx_work(struct btintel_pcie_data *data, u8 status, void *buf) { … } /* Handles the MSI-X interrupt for rx queue 1 which is for RX */ static void btintel_pcie_msix_rx_handle(struct btintel_pcie_data *data) { … } static irqreturn_t btintel_pcie_msix_isr(int irq, void *data) { … } static irqreturn_t btintel_pcie_irq_msix_handler(int irq, void *dev_id) { … } /* This function requests the irq for MSI-X and registers the handlers per irq. * Currently, it requests only 1 irq for all interrupt causes. */ static int btintel_pcie_setup_irq(struct btintel_pcie_data *data) { … } struct btintel_pcie_causes_list { … }; static struct btintel_pcie_causes_list causes_list[] = …; /* This function configures the interrupt masks for both HW_INT_CAUSES and * FH_INT_CAUSES which are meaningful to us. * * After resetting BT function via PCIE FLR or FUNC_CTRL reset, the driver * need to call this function again to configure since the masks * are reset to 0xFFFFFFFF after reset. */ static void btintel_pcie_config_msix(struct btintel_pcie_data *data) { … } static int btintel_pcie_config_pcie(struct pci_dev *pdev, struct btintel_pcie_data *data) { … } static void btintel_pcie_init_ci(struct btintel_pcie_data *data, struct ctx_info *ci) { … } static void btintel_pcie_free_txq_bufs(struct btintel_pcie_data *data, struct txq *txq) { … } static int btintel_pcie_setup_txq_bufs(struct btintel_pcie_data *data, struct txq *txq) { … } static void btintel_pcie_free_rxq_bufs(struct btintel_pcie_data *data, struct rxq *rxq) { … } static int btintel_pcie_setup_rxq_bufs(struct btintel_pcie_data *data, struct rxq *rxq) { … } static void btintel_pcie_setup_ia(struct btintel_pcie_data *data, dma_addr_t p_addr, void *v_addr, struct ia *ia) { … } static void btintel_pcie_free(struct btintel_pcie_data *data) { … } /* Allocate tx and rx queues, any related data structures and buffers. */ static int btintel_pcie_alloc(struct btintel_pcie_data *data) { … } static int btintel_pcie_open(struct hci_dev *hdev) { … } static int btintel_pcie_close(struct hci_dev *hdev) { … } static int btintel_pcie_inject_cmd_complete(struct hci_dev *hdev, __u16 opcode) { … } static int btintel_pcie_send_frame(struct hci_dev *hdev, struct sk_buff *skb) { … } static void btintel_pcie_release_hdev(struct btintel_pcie_data *data) { … } static int btintel_pcie_setup(struct hci_dev *hdev) { … } static int btintel_pcie_setup_hdev(struct btintel_pcie_data *data) { … } static int btintel_pcie_probe(struct pci_dev *pdev, const struct pci_device_id *ent) { … } static void btintel_pcie_remove(struct pci_dev *pdev) { … } static struct pci_driver btintel_pcie_driver = …; module_pci_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_VERSION(…); MODULE_LICENSE(…) …;
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