// SPDX-License-Identifier: GPL-2.0+ /* * c67x00-sched.c: Cypress C67X00 USB Host Controller Driver - TD scheduling * * Copyright (C) 2006-2008 Barco N.V. * Derived from the Cypress cy7c67200/300 ezusb linux driver and * based on multiple host controller drivers inside the linux kernel. */ #include <linux/kthread.h> #include <linux/slab.h> #include "c67x00.h" #include "c67x00-hcd.h" /* * These are the stages for a control urb, they are kept * in both urb->interval and td->privdata. */ #define SETUP_STAGE … #define DATA_STAGE … #define STATUS_STAGE … /* -------------------------------------------------------------------------- */ /* * struct c67x00_ep_data: Host endpoint data structure */ struct c67x00_ep_data { … }; /* * struct c67x00_td * * Hardware parts are little endiannes, SW in CPU endianess. */ struct c67x00_td { … }; struct c67x00_urb_priv { … }; #define td_udev(td) … #define CY_TD_SIZE … #define TD_PIDEP_OFFSET … #define TD_PIDEPMASK_PID … #define TD_PIDEPMASK_EP … #define TD_PORTLENMASK_DL … #define TD_PORTLENMASK_PN … #define TD_STATUS_OFFSET … #define TD_STATUSMASK_ACK … #define TD_STATUSMASK_ERR … #define TD_STATUSMASK_TMOUT … #define TD_STATUSMASK_SEQ … #define TD_STATUSMASK_SETUP … #define TD_STATUSMASK_OVF … #define TD_STATUSMASK_NAK … #define TD_STATUSMASK_STALL … #define TD_ERROR_MASK … #define TD_RETRYCNT_OFFSET … #define TD_RETRYCNTMASK_ACT_FLG … #define TD_RETRYCNTMASK_TX_TYPE … #define TD_RETRYCNTMASK_RTY_CNT … #define TD_RESIDUE_OVERFLOW … #define TD_PID_IN … /* Residue: signed 8bits, neg -> OVERFLOW, pos -> UNDERFLOW */ #define td_residue(td) … #define td_ly_base_addr(td) … #define td_port_length(td) … #define td_next_td_addr(td) … #define td_active(td) … #define td_length(td) … #define td_sequence_ok(td) … #define td_acked(td) … #define td_actual_bytes(td) … /* -------------------------------------------------------------------------- */ /* * dbg_td - Dump the contents of the TD */ static void dbg_td(struct c67x00_hcd *c67x00, struct c67x00_td *td, char *msg) { … } /* -------------------------------------------------------------------------- */ /* Helper functions */ static inline u16 c67x00_get_current_frame_number(struct c67x00_hcd *c67x00) { … } /* * frame_add * Software wraparound for framenumbers. */ static inline u16 frame_add(u16 a, u16 b) { … } /* * frame_after - is frame a after frame b */ static inline int frame_after(u16 a, u16 b) { … } /* * frame_after_eq - is frame a after or equal to frame b */ static inline int frame_after_eq(u16 a, u16 b) { … } /* -------------------------------------------------------------------------- */ /* * c67x00_release_urb - remove link from all tds to this urb * Disconnects the urb from it's tds, so that it can be given back. * pre: urb->hcpriv != NULL */ static void c67x00_release_urb(struct c67x00_hcd *c67x00, struct urb *urb) { … } /* -------------------------------------------------------------------------- */ static struct c67x00_ep_data * c67x00_ep_data_alloc(struct c67x00_hcd *c67x00, struct urb *urb) { … } static int c67x00_ep_data_free(struct usb_host_endpoint *hep) { … } void c67x00_endpoint_disable(struct usb_hcd *hcd, struct usb_host_endpoint *ep) { … } /* -------------------------------------------------------------------------- */ static inline int get_root_port(struct usb_device *dev) { … } int c67x00_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flags) { … } int c67x00_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status) { … } /* -------------------------------------------------------------------------- */ /* * pre: c67x00 locked, urb unlocked */ static void c67x00_giveback_urb(struct c67x00_hcd *c67x00, struct urb *urb, int status) { … } /* -------------------------------------------------------------------------- */ static int c67x00_claim_frame_bw(struct c67x00_hcd *c67x00, struct urb *urb, int len, int periodic) { … } /* -------------------------------------------------------------------------- */ /* * td_addr and buf_addr must be word aligned */ static int c67x00_create_td(struct c67x00_hcd *c67x00, struct urb *urb, void *data, int len, int pid, int toggle, unsigned long privdata) { … } static inline void c67x00_release_td(struct c67x00_td *td) { … } /* -------------------------------------------------------------------------- */ static int c67x00_add_data_urb(struct c67x00_hcd *c67x00, struct urb *urb) { … } /* * return 0 in case more bandwidth is available, else errorcode */ static int c67x00_add_ctrl_urb(struct c67x00_hcd *c67x00, struct urb *urb) { … } /* * return 0 in case more bandwidth is available, else errorcode */ static int c67x00_add_int_urb(struct c67x00_hcd *c67x00, struct urb *urb) { … } static int c67x00_add_iso_urb(struct c67x00_hcd *c67x00, struct urb *urb) { … } /* -------------------------------------------------------------------------- */ static void c67x00_fill_from_list(struct c67x00_hcd *c67x00, int type, int (*add)(struct c67x00_hcd *, struct urb *)) { … } static void c67x00_fill_frame(struct c67x00_hcd *c67x00) { … } /* -------------------------------------------------------------------------- */ /* * Get TD from C67X00 */ static inline void c67x00_parse_td(struct c67x00_hcd *c67x00, struct c67x00_td *td) { … } static int c67x00_td_to_error(struct c67x00_hcd *c67x00, struct c67x00_td *td) { … } static inline int c67x00_end_of_data(struct c67x00_td *td) { … } /* -------------------------------------------------------------------------- */ /* Remove all td's from the list which come * after last_td and are meant for the same pipe. * This is used when a short packet has occurred */ static inline void c67x00_clear_pipe(struct c67x00_hcd *c67x00, struct c67x00_td *last_td) { … } /* -------------------------------------------------------------------------- */ static void c67x00_handle_successful_td(struct c67x00_hcd *c67x00, struct c67x00_td *td) { … } static void c67x00_handle_isoc(struct c67x00_hcd *c67x00, struct c67x00_td *td) { … } /* -------------------------------------------------------------------------- */ /* * c67x00_check_td_list - handle tds which have been processed by the c67x00 * pre: current_td == 0 */ static inline void c67x00_check_td_list(struct c67x00_hcd *c67x00) { … } /* -------------------------------------------------------------------------- */ static inline int c67x00_all_tds_processed(struct c67x00_hcd *c67x00) { … } /* * Send td to C67X00 */ static void c67x00_send_td(struct c67x00_hcd *c67x00, struct c67x00_td *td) { … } static void c67x00_send_frame(struct c67x00_hcd *c67x00) { … } /* -------------------------------------------------------------------------- */ /* * c67x00_do_work - Schedulers state machine */ static void c67x00_do_work(struct c67x00_hcd *c67x00) { … } /* -------------------------------------------------------------------------- */ static void c67x00_sched_work(struct work_struct *work) { … } void c67x00_sched_kick(struct c67x00_hcd *c67x00) { … } int c67x00_sched_start_scheduler(struct c67x00_hcd *c67x00) { … } void c67x00_sched_stop_scheduler(struct c67x00_hcd *c67x00) { … }
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