// SPDX-License-Identifier: GPL-2.0+ /* * bdc_ep.c - BRCM BDC USB3.0 device controller endpoint related functions * * Copyright (C) 2014 Broadcom Corporation * * Author: Ashwini Pahuja * * Based on drivers under drivers/usb/ */ #include <linux/module.h> #include <linux/pci.h> #include <linux/dma-mapping.h> #include <linux/kernel.h> #include <linux/delay.h> #include <linux/dmapool.h> #include <linux/ioport.h> #include <linux/sched.h> #include <linux/slab.h> #include <linux/errno.h> #include <linux/init.h> #include <linux/timer.h> #include <linux/list.h> #include <linux/interrupt.h> #include <linux/moduleparam.h> #include <linux/device.h> #include <linux/usb/ch9.h> #include <linux/usb/gadget.h> #include <linux/usb/otg.h> #include <linux/pm.h> #include <linux/io.h> #include <linux/irq.h> #include <asm/unaligned.h> #include <linux/platform_device.h> #include <linux/usb/composite.h> #include "bdc.h" #include "bdc_ep.h" #include "bdc_cmd.h" #include "bdc_dbg.h" static const char * const ep0_state_string[] = …; /* Free the bdl during ep disable */ static void ep_bd_list_free(struct bdc_ep *ep, u32 num_tabs) { … } /* * chain the tables, by insteting a chain bd at the end of prev_table, pointing * to next_table */ static inline void chain_table(struct bd_table *prev_table, struct bd_table *next_table, u32 bd_p_tab) { … } /* Allocate the bdl for ep, during config ep */ static int ep_bd_list_alloc(struct bdc_ep *ep) { … } /* returns how many bd's are need for this transfer */ static inline int bd_needed_req(struct bdc_req *req) { … } /* returns the bd index(bdi) corresponding to bd dma address */ static int bd_add_to_bdi(struct bdc_ep *ep, dma_addr_t bd_dma_addr) { … } /* returns the table index(tbi) of the given bdi */ static int bdi_to_tbi(struct bdc_ep *ep, int bdi) { … } /* Find the bdi last bd in the transfer */ static inline int find_end_bdi(struct bdc_ep *ep, int next_hwd_bdi) { … } /* * How many transfer bd's are available on this ep bdl, chain bds are not * counted in available bds */ static int bd_available_ep(struct bdc_ep *ep) { … } /* Notify the hardware after queueing the bd to bdl */ void bdc_notify_xfr(struct bdc *bdc, u32 epnum) { … } /* returns the bd corresponding to bdi */ static struct bdc_bd *bdi_to_bd(struct bdc_ep *ep, int bdi) { … } /* Advance the enqueue pointer */ static void ep_bdlist_eqp_adv(struct bdc_ep *ep) { … } /* Setup the first bd for ep0 transfer */ static int setup_first_bd_ep0(struct bdc *bdc, struct bdc_req *req, u32 *dword3) { … } /* Setup the bd dma descriptor for a given request */ static int setup_bd_list_xfr(struct bdc *bdc, struct bdc_req *req, int num_bds) { … } /* Queue the xfr */ static int bdc_queue_xfr(struct bdc *bdc, struct bdc_req *req) { … } /* callback to gadget layer when xfr completes */ static void bdc_req_complete(struct bdc_ep *ep, struct bdc_req *req, int status) { … } /* Disable the endpoint */ int bdc_ep_disable(struct bdc_ep *ep) { … } /* Enable the ep */ int bdc_ep_enable(struct bdc_ep *ep) { … } /* EP0 related code */ /* Queue a status stage BD */ static int ep0_queue_status_stage(struct bdc *bdc) { … } /* Queue xfr on ep0 */ static int ep0_queue(struct bdc_ep *ep, struct bdc_req *req) { … } /* Queue data stage */ static int ep0_queue_data_stage(struct bdc *bdc) { … } /* Queue req on ep */ static int ep_queue(struct bdc_ep *ep, struct bdc_req *req) { … } /* Dequeue a request from ep */ static int ep_dequeue(struct bdc_ep *ep, struct bdc_req *req) { … } /* Halt/Clear the ep based on value */ static int ep_set_halt(struct bdc_ep *ep, u32 value) { … } /* Free all the ep */ void bdc_free_ep(struct bdc *bdc) { … } /* USB2 spec, section 7.1.20 */ static int bdc_set_test_mode(struct bdc *bdc) { … } /* * Helper function to handle Transfer status report with status as either * success or short */ static void handle_xsr_succ_status(struct bdc *bdc, struct bdc_ep *ep, struct bdc_sr *sreport) { … } /* EP0 setup related packet handlers */ /* * Setup packet received, just store the packet and process on next DS or SS * started SR */ void bdc_xsf_ep0_setup_recv(struct bdc *bdc, struct bdc_sr *sreport) { … } /* Stall ep0 */ static void ep0_stall(struct bdc *bdc) { … } /* SET_ADD handlers */ static int ep0_set_address(struct bdc *bdc, struct usb_ctrlrequest *ctrl) { … } /* Handler for SET/CLEAR FEATURE requests for device */ static int ep0_handle_feature_dev(struct bdc *bdc, u16 wValue, u16 wIndex, bool set) { … } /* SET/CLEAR FEATURE handler */ static int ep0_handle_feature(struct bdc *bdc, struct usb_ctrlrequest *setup_pkt, bool set) { … } /* GET_STATUS request handler */ static int ep0_handle_status(struct bdc *bdc, struct usb_ctrlrequest *setup_pkt) { … } static void ep0_set_sel_cmpl(struct usb_ep *_ep, struct usb_request *_req) { … } /* Queue data stage to handle 6 byte SET_SEL request */ static int ep0_set_sel(struct bdc *bdc, struct usb_ctrlrequest *setup_pkt) { … } /* * Queue a 0 byte bd only if wLength is more than the length and length is * a multiple of MaxPacket then queue 0 byte BD */ static int ep0_queue_zlp(struct bdc *bdc) { … } /* Control request handler */ static int handle_control_request(struct bdc *bdc) { … } /* EP0: Data stage started */ void bdc_xsf_ep0_data_start(struct bdc *bdc, struct bdc_sr *sreport) { … } /* EP0: status stage started */ void bdc_xsf_ep0_status_start(struct bdc *bdc, struct bdc_sr *sreport) { … } /* Helper function to update ep0 upon SR with xsf_succ or xsf_short */ static void ep0_xsf_complete(struct bdc *bdc, struct bdc_sr *sreport) { … } /* xfr completion status report handler */ void bdc_sr_xsf(struct bdc *bdc, struct bdc_sr *sreport) { … } static int bdc_gadget_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags) { … } static int bdc_gadget_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req) { … } static int bdc_gadget_ep_set_halt(struct usb_ep *_ep, int value) { … } static struct usb_request *bdc_gadget_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags) { … } static void bdc_gadget_free_request(struct usb_ep *_ep, struct usb_request *_req) { … } /* endpoint operations */ /* configure endpoint and also allocate resources */ static int bdc_gadget_ep_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc) { … } static int bdc_gadget_ep_disable(struct usb_ep *_ep) { … } static const struct usb_ep_ops bdc_gadget_ep_ops = …; /* dir = 1 is IN */ static int init_ep(struct bdc *bdc, u32 epnum, u32 dir) { … } /* Init all ep */ int bdc_init_ep(struct bdc *bdc) { … }
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