// SPDX-License-Identifier: GPL-2.0 /* * Copyright (C) 2011 LAPIS Semiconductor Co., Ltd. */ #define pr_fmt(fmt) … #include <linux/kernel.h> #include <linux/module.h> #include <linux/pci.h> #include <linux/delay.h> #include <linux/errno.h> #include <linux/gpio/consumer.h> #include <linux/gpio/machine.h> #include <linux/list.h> #include <linux/interrupt.h> #include <linux/usb/ch9.h> #include <linux/usb/gadget.h> #include <linux/irq.h> #define PCH_VBUS_PERIOD … #define PCH_VBUS_INTERVAL … /* Address offset of Registers */ #define UDC_EP_REG_SHIFT … #define UDC_EPCTL_ADDR … #define UDC_EPSTS_ADDR … #define UDC_BUFIN_FRAMENUM_ADDR … #define UDC_BUFOUT_MAXPKT_ADDR … #define UDC_SUBPTR_ADDR … #define UDC_DESPTR_ADDR … #define UDC_CONFIRM_ADDR … #define UDC_DEVCFG_ADDR … #define UDC_DEVCTL_ADDR … #define UDC_DEVSTS_ADDR … #define UDC_DEVIRQSTS_ADDR … #define UDC_DEVIRQMSK_ADDR … #define UDC_EPIRQSTS_ADDR … #define UDC_EPIRQMSK_ADDR … #define UDC_DEVLPM_ADDR … #define UDC_CSR_BUSY_ADDR … #define UDC_SRST_ADDR … #define UDC_CSR_ADDR … /* Endpoint control register */ /* Bit position */ #define UDC_EPCTL_MRXFLUSH … #define UDC_EPCTL_RRDY … #define UDC_EPCTL_CNAK … #define UDC_EPCTL_SNAK … #define UDC_EPCTL_NAK … #define UDC_EPCTL_P … #define UDC_EPCTL_F … #define UDC_EPCTL_S … #define UDC_EPCTL_ET_SHIFT … /* Mask patern */ #define UDC_EPCTL_ET_MASK … /* Value for ET field */ #define UDC_EPCTL_ET_CONTROL … #define UDC_EPCTL_ET_ISO … #define UDC_EPCTL_ET_BULK … #define UDC_EPCTL_ET_INTERRUPT … /* Endpoint status register */ /* Bit position */ #define UDC_EPSTS_XFERDONE … #define UDC_EPSTS_RSS … #define UDC_EPSTS_RCS … #define UDC_EPSTS_TXEMPTY … #define UDC_EPSTS_TDC … #define UDC_EPSTS_HE … #define UDC_EPSTS_MRXFIFO_EMP … #define UDC_EPSTS_BNA … #define UDC_EPSTS_IN … #define UDC_EPSTS_OUT_SHIFT … /* Mask patern */ #define UDC_EPSTS_OUT_MASK … #define UDC_EPSTS_ALL_CLR_MASK … /* Value for OUT field */ #define UDC_EPSTS_OUT_SETUP … #define UDC_EPSTS_OUT_DATA … /* Device configuration register */ /* Bit position */ #define UDC_DEVCFG_CSR_PRG … #define UDC_DEVCFG_SP … /* SPD Valee */ #define UDC_DEVCFG_SPD_HS … #define UDC_DEVCFG_SPD_FS … #define UDC_DEVCFG_SPD_LS … /* Device control register */ /* Bit position */ #define UDC_DEVCTL_THLEN_SHIFT … #define UDC_DEVCTL_BRLEN_SHIFT … #define UDC_DEVCTL_CSR_DONE … #define UDC_DEVCTL_SD … #define UDC_DEVCTL_MODE … #define UDC_DEVCTL_BREN … #define UDC_DEVCTL_THE … #define UDC_DEVCTL_DU … #define UDC_DEVCTL_TDE … #define UDC_DEVCTL_RDE … #define UDC_DEVCTL_RES … /* Device status register */ /* Bit position */ #define UDC_DEVSTS_TS_SHIFT … #define UDC_DEVSTS_ENUM_SPEED_SHIFT … #define UDC_DEVSTS_ALT_SHIFT … #define UDC_DEVSTS_INTF_SHIFT … #define UDC_DEVSTS_CFG_SHIFT … /* Mask patern */ #define UDC_DEVSTS_TS_MASK … #define UDC_DEVSTS_ENUM_SPEED_MASK … #define UDC_DEVSTS_ALT_MASK … #define UDC_DEVSTS_INTF_MASK … #define UDC_DEVSTS_CFG_MASK … /* value for maximum speed for SPEED field */ #define UDC_DEVSTS_ENUM_SPEED_FULL … #define UDC_DEVSTS_ENUM_SPEED_HIGH … #define UDC_DEVSTS_ENUM_SPEED_LOW … #define UDC_DEVSTS_ENUM_SPEED_FULLX … /* Device irq register */ /* Bit position */ #define UDC_DEVINT_RWKP … #define UDC_DEVINT_ENUM … #define UDC_DEVINT_SOF … #define UDC_DEVINT_US … #define UDC_DEVINT_UR … #define UDC_DEVINT_ES … #define UDC_DEVINT_SI … #define UDC_DEVINT_SC … /* Mask patern */ #define UDC_DEVINT_MSK … /* Endpoint irq register */ /* Bit position */ #define UDC_EPINT_IN_SHIFT … #define UDC_EPINT_OUT_SHIFT … #define UDC_EPINT_IN_EP0 … #define UDC_EPINT_OUT_EP0 … /* Mask patern */ #define UDC_EPINT_MSK_DISABLE_ALL … /* UDC_CSR_BUSY Status register */ /* Bit position */ #define UDC_CSR_BUSY … /* SOFT RESET register */ /* Bit position */ #define UDC_PSRST … #define UDC_SRST … /* USB_DEVICE endpoint register */ /* Bit position */ #define UDC_CSR_NE_NUM_SHIFT … #define UDC_CSR_NE_DIR_SHIFT … #define UDC_CSR_NE_TYPE_SHIFT … #define UDC_CSR_NE_CFG_SHIFT … #define UDC_CSR_NE_INTF_SHIFT … #define UDC_CSR_NE_ALT_SHIFT … #define UDC_CSR_NE_MAX_PKT_SHIFT … /* Mask patern */ #define UDC_CSR_NE_NUM_MASK … #define UDC_CSR_NE_DIR_MASK … #define UDC_CSR_NE_TYPE_MASK … #define UDC_CSR_NE_CFG_MASK … #define UDC_CSR_NE_INTF_MASK … #define UDC_CSR_NE_ALT_MASK … #define UDC_CSR_NE_MAX_PKT_MASK … #define PCH_UDC_CSR(ep) … #define PCH_UDC_EPINT(in, num) … /* Index of endpoint */ #define UDC_EP0IN_IDX … #define UDC_EP0OUT_IDX … #define UDC_EPIN_IDX(ep) … #define UDC_EPOUT_IDX(ep) … #define PCH_UDC_EP0 … #define PCH_UDC_EP1 … #define PCH_UDC_EP2 … #define PCH_UDC_EP3 … /* Number of endpoint */ #define PCH_UDC_EP_NUM … #define PCH_UDC_USED_EP_NUM … /* Length Value */ #define PCH_UDC_BRLEN … #define PCH_UDC_THLEN … /* Value of EP Buffer Size */ #define UDC_EP0IN_BUFF_SIZE … #define UDC_EPIN_BUFF_SIZE … #define UDC_EP0OUT_BUFF_SIZE … #define UDC_EPOUT_BUFF_SIZE … /* Value of EP maximum packet size */ #define UDC_EP0IN_MAX_PKT_SIZE … #define UDC_EP0OUT_MAX_PKT_SIZE … #define UDC_BULK_MAX_PKT_SIZE … /* DMA */ #define DMA_DIR_RX … #define DMA_DIR_TX … #define DMA_ADDR_INVALID … #define UDC_DMA_MAXPACKET … /** * struct pch_udc_data_dma_desc - Structure to hold DMA descriptor information * for data * @status: Status quadlet * @reserved: Reserved * @dataptr: Buffer descriptor * @next: Next descriptor */ struct pch_udc_data_dma_desc { … }; /** * struct pch_udc_stp_dma_desc - Structure to hold DMA descriptor information * for control data * @status: Status * @reserved: Reserved * @request: Control Request */ struct pch_udc_stp_dma_desc { … } __attribute((packed)); /* DMA status definitions */ /* Buffer status */ #define PCH_UDC_BUFF_STS … #define PCH_UDC_BS_HST_RDY … #define PCH_UDC_BS_DMA_BSY … #define PCH_UDC_BS_DMA_DONE … #define PCH_UDC_BS_HST_BSY … /* Rx/Tx Status */ #define PCH_UDC_RXTX_STS … #define PCH_UDC_RTS_SUCC … #define PCH_UDC_RTS_DESERR … #define PCH_UDC_RTS_BUFERR … /* Last Descriptor Indication */ #define PCH_UDC_DMA_LAST … /* Number of Rx/Tx Bytes Mask */ #define PCH_UDC_RXTX_BYTES … /** * struct pch_udc_cfg_data - Structure to hold current configuration * and interface information * @cur_cfg: current configuration in use * @cur_intf: current interface in use * @cur_alt: current alt interface in use */ struct pch_udc_cfg_data { … }; /** * struct pch_udc_ep - Structure holding a PCH USB device Endpoint information * @ep: embedded ep request * @td_stp_phys: for setup request * @td_data_phys: for data request * @td_stp: for setup request * @td_data: for data request * @dev: reference to device struct * @offset_addr: offset address of ep register * @queue: queue for requests * @num: endpoint number * @in: endpoint is IN * @halted: endpoint halted? * @epsts: Endpoint status */ struct pch_udc_ep { … }; /** * struct pch_vbus_gpio_data - Structure holding GPIO informaton * for detecting VBUS * @port: gpio descriptor for the VBUS GPIO * @intr: gpio interrupt number * @irq_work_fall: Structure for WorkQueue * @irq_work_rise: Structure for WorkQueue */ struct pch_vbus_gpio_data { … }; /** * struct pch_udc_dev - Structure holding complete information * of the PCH USB device * @gadget: gadget driver data * @driver: reference to gadget driver bound * @pdev: reference to the PCI device * @ep: array of endpoints * @lock: protects all state * @stall: stall requested * @prot_stall: protcol stall requested * @registered: driver registered with system * @suspended: driver in suspended state * @connected: gadget driver associated * @vbus_session: required vbus_session state * @set_cfg_not_acked: pending acknowledgement 4 setup * @waiting_zlp_ack: pending acknowledgement 4 ZLP * @data_requests: DMA pool for data requests * @stp_requests: DMA pool for setup requests * @dma_addr: DMA pool for received * @setup_data: Received setup data * @base_addr: for mapped device memory * @bar: PCI BAR used for mapped device memory * @cfg_data: current cfg, intf, and alt in use * @vbus_gpio: GPIO informaton for detecting VBUS */ struct pch_udc_dev { … }; #define to_pch_udc(g) … #define PCH_UDC_PCI_BAR_QUARK_X1000 … #define PCH_UDC_PCI_BAR … #define PCI_DEVICE_ID_INTEL_QUARK_X1000_UDC … #define PCI_DEVICE_ID_INTEL_EG20T_UDC … #define PCI_DEVICE_ID_ML7213_IOH_UDC … #define PCI_DEVICE_ID_ML7831_IOH_UDC … static const char ep0_string[] = …; static DEFINE_SPINLOCK(udc_stall_spinlock); /* stall spin lock */ static bool speed_fs; module_param_named(speed_fs, speed_fs, bool, S_IRUGO); MODULE_PARM_DESC(…) …; /** * struct pch_udc_request - Structure holding a PCH USB device request packet * @req: embedded ep request * @td_data_phys: phys. address * @td_data: first dma desc. of chain * @td_data_last: last dma desc. of chain * @queue: associated queue * @dma_going: DMA in progress for request * @dma_done: DMA completed for request * @chain_len: chain length */ struct pch_udc_request { … }; static inline u32 pch_udc_readl(struct pch_udc_dev *dev, unsigned long reg) { … } static inline void pch_udc_writel(struct pch_udc_dev *dev, unsigned long val, unsigned long reg) { … } static inline void pch_udc_bit_set(struct pch_udc_dev *dev, unsigned long reg, unsigned long bitmask) { … } static inline void pch_udc_bit_clr(struct pch_udc_dev *dev, unsigned long reg, unsigned long bitmask) { … } static inline u32 pch_udc_ep_readl(struct pch_udc_ep *ep, unsigned long reg) { … } static inline void pch_udc_ep_writel(struct pch_udc_ep *ep, unsigned long val, unsigned long reg) { … } static inline void pch_udc_ep_bit_set(struct pch_udc_ep *ep, unsigned long reg, unsigned long bitmask) { … } static inline void pch_udc_ep_bit_clr(struct pch_udc_ep *ep, unsigned long reg, unsigned long bitmask) { … } /** * pch_udc_csr_busy() - Wait till idle. * @dev: Reference to pch_udc_dev structure */ static void pch_udc_csr_busy(struct pch_udc_dev *dev) { … } /** * pch_udc_write_csr() - Write the command and status registers. * @dev: Reference to pch_udc_dev structure * @val: value to be written to CSR register * @ep: end-point number */ static void pch_udc_write_csr(struct pch_udc_dev *dev, unsigned long val, unsigned int ep) { … } /** * pch_udc_read_csr() - Read the command and status registers. * @dev: Reference to pch_udc_dev structure * @ep: end-point number * * Return codes: content of CSR register */ static u32 pch_udc_read_csr(struct pch_udc_dev *dev, unsigned int ep) { … } /** * pch_udc_rmt_wakeup() - Initiate for remote wakeup * @dev: Reference to pch_udc_dev structure */ static inline void pch_udc_rmt_wakeup(struct pch_udc_dev *dev) { … } /** * pch_udc_get_frame() - Get the current frame from device status register * @dev: Reference to pch_udc_dev structure * Retern current frame */ static inline int pch_udc_get_frame(struct pch_udc_dev *dev) { … } /** * pch_udc_clear_selfpowered() - Clear the self power control * @dev: Reference to pch_udc_regs structure */ static inline void pch_udc_clear_selfpowered(struct pch_udc_dev *dev) { … } /** * pch_udc_set_selfpowered() - Set the self power control * @dev: Reference to pch_udc_regs structure */ static inline void pch_udc_set_selfpowered(struct pch_udc_dev *dev) { … } /** * pch_udc_set_disconnect() - Set the disconnect status. * @dev: Reference to pch_udc_regs structure */ static inline void pch_udc_set_disconnect(struct pch_udc_dev *dev) { … } /** * pch_udc_clear_disconnect() - Clear the disconnect status. * @dev: Reference to pch_udc_regs structure */ static void pch_udc_clear_disconnect(struct pch_udc_dev *dev) { … } static void pch_udc_init(struct pch_udc_dev *dev); /** * pch_udc_reconnect() - This API initializes usb device controller, * and clear the disconnect status. * @dev: Reference to pch_udc_regs structure */ static void pch_udc_reconnect(struct pch_udc_dev *dev) { … } /** * pch_udc_vbus_session() - set or clearr the disconnect status. * @dev: Reference to pch_udc_regs structure * @is_active: Parameter specifying the action * 0: indicating VBUS power is ending * !0: indicating VBUS power is starting */ static inline void pch_udc_vbus_session(struct pch_udc_dev *dev, int is_active) { … } /** * pch_udc_ep_set_stall() - Set the stall of endpoint * @ep: Reference to structure of type pch_udc_ep_regs */ static void pch_udc_ep_set_stall(struct pch_udc_ep *ep) { … } /** * pch_udc_ep_clear_stall() - Clear the stall of endpoint * @ep: Reference to structure of type pch_udc_ep_regs */ static inline void pch_udc_ep_clear_stall(struct pch_udc_ep *ep) { … } /** * pch_udc_ep_set_trfr_type() - Set the transfer type of endpoint * @ep: Reference to structure of type pch_udc_ep_regs * @type: Type of endpoint */ static inline void pch_udc_ep_set_trfr_type(struct pch_udc_ep *ep, u8 type) { … } /** * pch_udc_ep_set_bufsz() - Set the maximum packet size for the endpoint * @ep: Reference to structure of type pch_udc_ep_regs * @buf_size: The buffer word size * @ep_in: EP is IN */ static void pch_udc_ep_set_bufsz(struct pch_udc_ep *ep, u32 buf_size, u32 ep_in) { … } /** * pch_udc_ep_set_maxpkt() - Set the Max packet size for the endpoint * @ep: Reference to structure of type pch_udc_ep_regs * @pkt_size: The packet byte size */ static void pch_udc_ep_set_maxpkt(struct pch_udc_ep *ep, u32 pkt_size) { … } /** * pch_udc_ep_set_subptr() - Set the Setup buffer pointer for the endpoint * @ep: Reference to structure of type pch_udc_ep_regs * @addr: Address of the register */ static inline void pch_udc_ep_set_subptr(struct pch_udc_ep *ep, u32 addr) { … } /** * pch_udc_ep_set_ddptr() - Set the Data descriptor pointer for the endpoint * @ep: Reference to structure of type pch_udc_ep_regs * @addr: Address of the register */ static inline void pch_udc_ep_set_ddptr(struct pch_udc_ep *ep, u32 addr) { … } /** * pch_udc_ep_set_pd() - Set the poll demand bit for the endpoint * @ep: Reference to structure of type pch_udc_ep_regs */ static inline void pch_udc_ep_set_pd(struct pch_udc_ep *ep) { … } /** * pch_udc_ep_set_rrdy() - Set the receive ready bit for the endpoint * @ep: Reference to structure of type pch_udc_ep_regs */ static inline void pch_udc_ep_set_rrdy(struct pch_udc_ep *ep) { … } /** * pch_udc_ep_clear_rrdy() - Clear the receive ready bit for the endpoint * @ep: Reference to structure of type pch_udc_ep_regs */ static inline void pch_udc_ep_clear_rrdy(struct pch_udc_ep *ep) { … } /** * pch_udc_set_dma() - Set the 'TDE' or RDE bit of device control * register depending on the direction specified * @dev: Reference to structure of type pch_udc_regs * @dir: whether Tx or Rx * DMA_DIR_RX: Receive * DMA_DIR_TX: Transmit */ static inline void pch_udc_set_dma(struct pch_udc_dev *dev, int dir) { … } /** * pch_udc_clear_dma() - Clear the 'TDE' or RDE bit of device control * register depending on the direction specified * @dev: Reference to structure of type pch_udc_regs * @dir: Whether Tx or Rx * DMA_DIR_RX: Receive * DMA_DIR_TX: Transmit */ static inline void pch_udc_clear_dma(struct pch_udc_dev *dev, int dir) { … } /** * pch_udc_set_csr_done() - Set the device control register * CSR done field (bit 13) * @dev: reference to structure of type pch_udc_regs */ static inline void pch_udc_set_csr_done(struct pch_udc_dev *dev) { … } /** * pch_udc_disable_interrupts() - Disables the specified interrupts * @dev: Reference to structure of type pch_udc_regs * @mask: Mask to disable interrupts */ static inline void pch_udc_disable_interrupts(struct pch_udc_dev *dev, u32 mask) { … } /** * pch_udc_enable_interrupts() - Enable the specified interrupts * @dev: Reference to structure of type pch_udc_regs * @mask: Mask to enable interrupts */ static inline void pch_udc_enable_interrupts(struct pch_udc_dev *dev, u32 mask) { … } /** * pch_udc_disable_ep_interrupts() - Disable endpoint interrupts * @dev: Reference to structure of type pch_udc_regs * @mask: Mask to disable interrupts */ static inline void pch_udc_disable_ep_interrupts(struct pch_udc_dev *dev, u32 mask) { … } /** * pch_udc_enable_ep_interrupts() - Enable endpoint interrupts * @dev: Reference to structure of type pch_udc_regs * @mask: Mask to enable interrupts */ static inline void pch_udc_enable_ep_interrupts(struct pch_udc_dev *dev, u32 mask) { … } /** * pch_udc_read_device_interrupts() - Read the device interrupts * @dev: Reference to structure of type pch_udc_regs * Retern The device interrupts */ static inline u32 pch_udc_read_device_interrupts(struct pch_udc_dev *dev) { … } /** * pch_udc_write_device_interrupts() - Write device interrupts * @dev: Reference to structure of type pch_udc_regs * @val: The value to be written to interrupt register */ static inline void pch_udc_write_device_interrupts(struct pch_udc_dev *dev, u32 val) { … } /** * pch_udc_read_ep_interrupts() - Read the endpoint interrupts * @dev: Reference to structure of type pch_udc_regs * Retern The endpoint interrupt */ static inline u32 pch_udc_read_ep_interrupts(struct pch_udc_dev *dev) { … } /** * pch_udc_write_ep_interrupts() - Clear endpoint interupts * @dev: Reference to structure of type pch_udc_regs * @val: The value to be written to interrupt register */ static inline void pch_udc_write_ep_interrupts(struct pch_udc_dev *dev, u32 val) { … } /** * pch_udc_read_device_status() - Read the device status * @dev: Reference to structure of type pch_udc_regs * Retern The device status */ static inline u32 pch_udc_read_device_status(struct pch_udc_dev *dev) { … } /** * pch_udc_read_ep_control() - Read the endpoint control * @ep: Reference to structure of type pch_udc_ep_regs * Retern The endpoint control register value */ static inline u32 pch_udc_read_ep_control(struct pch_udc_ep *ep) { … } /** * pch_udc_clear_ep_control() - Clear the endpoint control register * @ep: Reference to structure of type pch_udc_ep_regs * Retern The endpoint control register value */ static inline void pch_udc_clear_ep_control(struct pch_udc_ep *ep) { … } /** * pch_udc_read_ep_status() - Read the endpoint status * @ep: Reference to structure of type pch_udc_ep_regs * Retern The endpoint status */ static inline u32 pch_udc_read_ep_status(struct pch_udc_ep *ep) { … } /** * pch_udc_clear_ep_status() - Clear the endpoint status * @ep: Reference to structure of type pch_udc_ep_regs * @stat: Endpoint status */ static inline void pch_udc_clear_ep_status(struct pch_udc_ep *ep, u32 stat) { … } /** * pch_udc_ep_set_nak() - Set the bit 7 (SNAK field) * of the endpoint control register * @ep: Reference to structure of type pch_udc_ep_regs */ static inline void pch_udc_ep_set_nak(struct pch_udc_ep *ep) { … } /** * pch_udc_ep_clear_nak() - Set the bit 8 (CNAK field) * of the endpoint control register * @ep: reference to structure of type pch_udc_ep_regs */ static void pch_udc_ep_clear_nak(struct pch_udc_ep *ep) { … } /** * pch_udc_ep_fifo_flush() - Flush the endpoint fifo * @ep: reference to structure of type pch_udc_ep_regs * @dir: direction of endpoint * 0: endpoint is OUT * !0: endpoint is IN */ static void pch_udc_ep_fifo_flush(struct pch_udc_ep *ep, int dir) { … } /** * pch_udc_ep_enable() - This api enables endpoint * @ep: reference to structure of type pch_udc_ep_regs * @cfg: current configuration information * @desc: endpoint descriptor */ static void pch_udc_ep_enable(struct pch_udc_ep *ep, struct pch_udc_cfg_data *cfg, const struct usb_endpoint_descriptor *desc) { … } /** * pch_udc_ep_disable() - This api disables endpoint * @ep: reference to structure of type pch_udc_ep_regs */ static void pch_udc_ep_disable(struct pch_udc_ep *ep) { … } /** * pch_udc_wait_ep_stall() - Wait EP stall. * @ep: reference to structure of type pch_udc_ep_regs */ static void pch_udc_wait_ep_stall(struct pch_udc_ep *ep) { … } /** * pch_udc_init() - This API initializes usb device controller * @dev: Rreference to pch_udc_regs structure */ static void pch_udc_init(struct pch_udc_dev *dev) { … } /** * pch_udc_exit() - This API exit usb device controller * @dev: Reference to pch_udc_regs structure */ static void pch_udc_exit(struct pch_udc_dev *dev) { … } /** * pch_udc_pcd_get_frame() - This API is invoked to get the current frame number * @gadget: Reference to the gadget driver * * Return codes: * 0: Success * -EINVAL: If the gadget passed is NULL */ static int pch_udc_pcd_get_frame(struct usb_gadget *gadget) { … } /** * pch_udc_pcd_wakeup() - This API is invoked to initiate a remote wakeup * @gadget: Reference to the gadget driver * * Return codes: * 0: Success * -EINVAL: If the gadget passed is NULL */ static int pch_udc_pcd_wakeup(struct usb_gadget *gadget) { … } /** * pch_udc_pcd_selfpowered() - This API is invoked to specify whether the device * is self powered or not * @gadget: Reference to the gadget driver * @value: Specifies self powered or not * * Return codes: * 0: Success * -EINVAL: If the gadget passed is NULL */ static int pch_udc_pcd_selfpowered(struct usb_gadget *gadget, int value) { … } /** * pch_udc_pcd_pullup() - This API is invoked to make the device * visible/invisible to the host * @gadget: Reference to the gadget driver * @is_on: Specifies whether the pull up is made active or inactive * * Return codes: * 0: Success * -EINVAL: If the gadget passed is NULL */ static int pch_udc_pcd_pullup(struct usb_gadget *gadget, int is_on) { … } /** * pch_udc_pcd_vbus_session() - This API is used by a driver for an external * transceiver (or GPIO) that * detects a VBUS power session starting/ending * @gadget: Reference to the gadget driver * @is_active: specifies whether the session is starting or ending * * Return codes: * 0: Success * -EINVAL: If the gadget passed is NULL */ static int pch_udc_pcd_vbus_session(struct usb_gadget *gadget, int is_active) { … } /** * pch_udc_pcd_vbus_draw() - This API is used by gadget drivers during * SET_CONFIGURATION calls to * specify how much power the device can consume * @gadget: Reference to the gadget driver * @mA: specifies the current limit in 2mA unit * * Return codes: * -EINVAL: If the gadget passed is NULL * -EOPNOTSUPP: */ static int pch_udc_pcd_vbus_draw(struct usb_gadget *gadget, unsigned int mA) { … } static int pch_udc_start(struct usb_gadget *g, struct usb_gadget_driver *driver); static int pch_udc_stop(struct usb_gadget *g); static const struct usb_gadget_ops pch_udc_ops = …; /** * pch_vbus_gpio_get_value() - This API gets value of GPIO port as VBUS status. * @dev: Reference to the driver structure * * Return value: * 1: VBUS is high * 0: VBUS is low * -1: It is not enable to detect VBUS using GPIO */ static int pch_vbus_gpio_get_value(struct pch_udc_dev *dev) { … } /** * pch_vbus_gpio_work_fall() - This API keeps watch on VBUS becoming Low. * If VBUS is Low, disconnect is processed * @irq_work: Structure for WorkQueue * */ static void pch_vbus_gpio_work_fall(struct work_struct *irq_work) { … } /** * pch_vbus_gpio_work_rise() - This API checks VBUS is High. * If VBUS is High, connect is processed * @irq_work: Structure for WorkQueue * */ static void pch_vbus_gpio_work_rise(struct work_struct *irq_work) { … } /** * pch_vbus_gpio_irq() - IRQ handler for GPIO interrupt for changing VBUS * @irq: Interrupt request number * @data: Reference to the device structure * * Return codes: * 0: Success * -EINVAL: GPIO port is invalid or can't be initialized. */ static irqreturn_t pch_vbus_gpio_irq(int irq, void *data) { … } /** * pch_vbus_gpio_init() - This API initializes GPIO port detecting VBUS. * @dev: Reference to the driver structure * * Return codes: * 0: Success * -EINVAL: GPIO port is invalid or can't be initialized. */ static int pch_vbus_gpio_init(struct pch_udc_dev *dev) { … } /** * pch_vbus_gpio_free() - This API frees resources of GPIO port * @dev: Reference to the driver structure */ static void pch_vbus_gpio_free(struct pch_udc_dev *dev) { … } /** * complete_req() - This API is invoked from the driver when processing * of a request is complete * @ep: Reference to the endpoint structure * @req: Reference to the request structure * @status: Indicates the success/failure of completion */ static void complete_req(struct pch_udc_ep *ep, struct pch_udc_request *req, int status) __releases(&dev->lock) __acquires(&dev->lock) { … } /** * empty_req_queue() - This API empties the request queue of an endpoint * @ep: Reference to the endpoint structure */ static void empty_req_queue(struct pch_udc_ep *ep) { … } /** * pch_udc_free_dma_chain() - This function frees the DMA chain created * for the request * @dev: Reference to the driver structure * @req: Reference to the request to be freed * * Return codes: * 0: Success */ static void pch_udc_free_dma_chain(struct pch_udc_dev *dev, struct pch_udc_request *req) { … } /** * pch_udc_create_dma_chain() - This function creates or reinitializes * a DMA chain * @ep: Reference to the endpoint structure * @req: Reference to the request * @buf_len: The buffer length * @gfp_flags: Flags to be used while mapping the data buffer * * Return codes: * 0: success, * -ENOMEM: dma_pool_alloc invocation fails */ static int pch_udc_create_dma_chain(struct pch_udc_ep *ep, struct pch_udc_request *req, unsigned long buf_len, gfp_t gfp_flags) { … } /** * prepare_dma() - This function creates and initializes the DMA chain * for the request * @ep: Reference to the endpoint structure * @req: Reference to the request * @gfp: Flag to be used while mapping the data buffer * * Return codes: * 0: Success * Other 0: linux error number on failure */ static int prepare_dma(struct pch_udc_ep *ep, struct pch_udc_request *req, gfp_t gfp) { … } /** * process_zlp() - This function process zero length packets * from the gadget driver * @ep: Reference to the endpoint structure * @req: Reference to the request */ static void process_zlp(struct pch_udc_ep *ep, struct pch_udc_request *req) { … } /** * pch_udc_start_rxrequest() - This function starts the receive requirement. * @ep: Reference to the endpoint structure * @req: Reference to the request structure */ static void pch_udc_start_rxrequest(struct pch_udc_ep *ep, struct pch_udc_request *req) { … } /** * pch_udc_pcd_ep_enable() - This API enables the endpoint. It is called * from gadget driver * @usbep: Reference to the USB endpoint structure * @desc: Reference to the USB endpoint descriptor structure * * Return codes: * 0: Success * -EINVAL: * -ESHUTDOWN: */ static int pch_udc_pcd_ep_enable(struct usb_ep *usbep, const struct usb_endpoint_descriptor *desc) { … } /** * pch_udc_pcd_ep_disable() - This API disables endpoint and is called * from gadget driver * @usbep: Reference to the USB endpoint structure * * Return codes: * 0: Success * -EINVAL: */ static int pch_udc_pcd_ep_disable(struct usb_ep *usbep) { … } /** * pch_udc_alloc_request() - This function allocates request structure. * It is called by gadget driver * @usbep: Reference to the USB endpoint structure * @gfp: Flag to be used while allocating memory * * Return codes: * NULL: Failure * Allocated address: Success */ static struct usb_request *pch_udc_alloc_request(struct usb_ep *usbep, gfp_t gfp) { … } /** * pch_udc_free_request() - This function frees request structure. * It is called by gadget driver * @usbep: Reference to the USB endpoint structure * @usbreq: Reference to the USB request */ static void pch_udc_free_request(struct usb_ep *usbep, struct usb_request *usbreq) { … } /** * pch_udc_pcd_queue() - This function queues a request packet. It is called * by gadget driver * @usbep: Reference to the USB endpoint structure * @usbreq: Reference to the USB request * @gfp: Flag to be used while mapping the data buffer * * Return codes: * 0: Success * linux error number: Failure */ static int pch_udc_pcd_queue(struct usb_ep *usbep, struct usb_request *usbreq, gfp_t gfp) { … } /** * pch_udc_pcd_dequeue() - This function de-queues a request packet. * It is called by gadget driver * @usbep: Reference to the USB endpoint structure * @usbreq: Reference to the USB request * * Return codes: * 0: Success * linux error number: Failure */ static int pch_udc_pcd_dequeue(struct usb_ep *usbep, struct usb_request *usbreq) { … } /** * pch_udc_pcd_set_halt() - This function Sets or clear the endpoint halt * feature * @usbep: Reference to the USB endpoint structure * @halt: Specifies whether to set or clear the feature * * Return codes: * 0: Success * linux error number: Failure */ static int pch_udc_pcd_set_halt(struct usb_ep *usbep, int halt) { … } /** * pch_udc_pcd_set_wedge() - This function Sets or clear the endpoint * halt feature * @usbep: Reference to the USB endpoint structure * * Return codes: * 0: Success * linux error number: Failure */ static int pch_udc_pcd_set_wedge(struct usb_ep *usbep) { … } /** * pch_udc_pcd_fifo_flush() - This function Flush the FIFO of specified endpoint * @usbep: Reference to the USB endpoint structure */ static void pch_udc_pcd_fifo_flush(struct usb_ep *usbep) { … } static const struct usb_ep_ops pch_udc_ep_ops = …; /** * pch_udc_init_setup_buff() - This function initializes the SETUP buffer * @td_stp: Reference to the SETP buffer structure */ static void pch_udc_init_setup_buff(struct pch_udc_stp_dma_desc *td_stp) { … } /** * pch_udc_start_next_txrequest() - This function starts * the next transmission requirement * @ep: Reference to the endpoint structure */ static void pch_udc_start_next_txrequest(struct pch_udc_ep *ep) { … } /** * pch_udc_complete_transfer() - This function completes a transfer * @ep: Reference to the endpoint structure */ static void pch_udc_complete_transfer(struct pch_udc_ep *ep) { … } /** * pch_udc_complete_receiver() - This function completes a receiver * @ep: Reference to the endpoint structure */ static void pch_udc_complete_receiver(struct pch_udc_ep *ep) { … } /** * pch_udc_svc_data_in() - This function process endpoint interrupts * for IN endpoints * @dev: Reference to the device structure * @ep_num: Endpoint that generated the interrupt */ static void pch_udc_svc_data_in(struct pch_udc_dev *dev, int ep_num) { … } /** * pch_udc_svc_data_out() - Handles interrupts from OUT endpoint * @dev: Reference to the device structure * @ep_num: Endpoint that generated the interrupt */ static void pch_udc_svc_data_out(struct pch_udc_dev *dev, int ep_num) { … } static int pch_udc_gadget_setup(struct pch_udc_dev *dev) __must_hold(&dev->lock) { … } /** * pch_udc_svc_control_in() - Handle Control IN endpoint interrupts * @dev: Reference to the device structure */ static void pch_udc_svc_control_in(struct pch_udc_dev *dev) { … } /** * pch_udc_svc_control_out() - Routine that handle Control * OUT endpoint interrupts * @dev: Reference to the device structure */ static void pch_udc_svc_control_out(struct pch_udc_dev *dev) __releases(&dev->lock) __acquires(&dev->lock) { … } /** * pch_udc_postsvc_epinters() - This function enables end point interrupts * and clears NAK status * @dev: Reference to the device structure * @ep_num: End point number */ static void pch_udc_postsvc_epinters(struct pch_udc_dev *dev, int ep_num) { … } /** * pch_udc_read_all_epstatus() - This function read all endpoint status * @dev: Reference to the device structure * @ep_intr: Status of endpoint interrupt */ static void pch_udc_read_all_epstatus(struct pch_udc_dev *dev, u32 ep_intr) { … } /** * pch_udc_activate_control_ep() - This function enables the control endpoints * for traffic after a reset * @dev: Reference to the device structure */ static void pch_udc_activate_control_ep(struct pch_udc_dev *dev) { … } /** * pch_udc_svc_ur_interrupt() - This function handles a USB reset interrupt * @dev: Reference to driver structure */ static void pch_udc_svc_ur_interrupt(struct pch_udc_dev *dev) { … } /** * pch_udc_svc_enum_interrupt() - This function handles a USB speed enumeration * done interrupt * @dev: Reference to driver structure */ static void pch_udc_svc_enum_interrupt(struct pch_udc_dev *dev) { … } /** * pch_udc_svc_intf_interrupt() - This function handles a set interface * interrupt * @dev: Reference to driver structure */ static void pch_udc_svc_intf_interrupt(struct pch_udc_dev *dev) { … } /** * pch_udc_svc_cfg_interrupt() - This function handles a set configuration * interrupt * @dev: Reference to driver structure */ static void pch_udc_svc_cfg_interrupt(struct pch_udc_dev *dev) { … } /** * pch_udc_dev_isr() - This function services device interrupts * by invoking appropriate routines. * @dev: Reference to the device structure * @dev_intr: The Device interrupt status. */ static void pch_udc_dev_isr(struct pch_udc_dev *dev, u32 dev_intr) { … } /** * pch_udc_isr() - This function handles interrupts from the PCH USB Device * @irq: Interrupt request number * @pdev: Reference to the device structure */ static irqreturn_t pch_udc_isr(int irq, void *pdev) { … } /** * pch_udc_setup_ep0() - This function enables control endpoint for traffic * @dev: Reference to the device structure */ static void pch_udc_setup_ep0(struct pch_udc_dev *dev) { … } /** * pch_udc_pcd_reinit() - This API initializes the endpoint structures * @dev: Reference to the driver structure */ static void pch_udc_pcd_reinit(struct pch_udc_dev *dev) { … } /** * pch_udc_pcd_init() - This API initializes the driver structure * @dev: Reference to the driver structure * * Return codes: * 0: Success * -ERRNO: All kind of errors when retrieving VBUS GPIO */ static int pch_udc_pcd_init(struct pch_udc_dev *dev) { … } /** * init_dma_pools() - create dma pools during initialization * @dev: reference to struct pci_dev */ static int init_dma_pools(struct pch_udc_dev *dev) { … } static int pch_udc_start(struct usb_gadget *g, struct usb_gadget_driver *driver) { … } static int pch_udc_stop(struct usb_gadget *g) { … } static void pch_vbus_gpio_remove_table(void *table) { … } static int pch_vbus_gpio_add_table(struct device *d, void *table) { … } static struct gpiod_lookup_table pch_udc_minnow_vbus_gpio_table = …; static int pch_udc_minnow_platform_init(struct device *d) { … } static int pch_udc_quark_platform_init(struct device *d) { … } static void pch_udc_shutdown(struct pci_dev *pdev) { … } static void pch_udc_remove(struct pci_dev *pdev) { … } static int __maybe_unused pch_udc_suspend(struct device *d) { … } static int __maybe_unused pch_udc_resume(struct device *d) { … } static SIMPLE_DEV_PM_OPS(pch_udc_pm, pch_udc_suspend, pch_udc_resume); platform_init_fn; static int pch_udc_probe(struct pci_dev *pdev, const struct pci_device_id *id) { … } static const struct pci_device_id pch_udc_pcidev_id[] = …; MODULE_DEVICE_TABLE(pci, pch_udc_pcidev_id); static struct pci_driver pch_udc_driver = …; module_pci_driver(…) …; MODULE_DESCRIPTION(…) …; MODULE_AUTHOR(…) …; MODULE_LICENSE(…) …;
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