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Diffstat (limited to '')
| -rw-r--r-- | drivers/usb/c67x00/c67x00-hcd.h | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/drivers/usb/c67x00/c67x00-hcd.h b/drivers/usb/c67x00/c67x00-hcd.h new file mode 100644 index 000000000..6332a6b5d --- /dev/null +++ b/drivers/usb/c67x00/c67x00-hcd.h @@ -0,0 +1,119 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * c67x00-hcd.h: Cypress C67X00 USB HCD + * + * 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. + */ + +#ifndef _USB_C67X00_HCD_H +#define _USB_C67X00_HCD_H + +#include <linux/kernel.h> +#include <linux/spinlock.h> +#include <linux/list.h> +#include <linux/usb.h> +#include <linux/usb/hcd.h> +#include "c67x00.h" + +/* + * The following parameters depend on the CPU speed, bus speed, ... + * These can be tuned for specific use cases, e.g. if isochronous transfers + * are very important, bandwidth can be sacrificed to guarantee that the + * 1ms deadline will be met. + * If bulk transfers are important, the MAX_FRAME_BW can be increased, + * but some (or many) isochronous deadlines might not be met. + * + * The values are specified in bittime. + */ + +/* + * The current implementation switches between _STD (default) and _ISO (when + * isochronous transfers are scheduled), in order to optimize the throughput + * in normal circumstances, but also provide good isochronous behaviour. + * + * Bandwidth is described in bit time so with a 12MHz USB clock and 1ms + * frames; there are 12000 bit times per frame. + */ + +#define TOTAL_FRAME_BW 12000 +#define DEFAULT_EOT 2250 + +#define MAX_FRAME_BW_STD (TOTAL_FRAME_BW - DEFAULT_EOT) +#define MAX_FRAME_BW_ISO 2400 + +/* + * Periodic transfers may only use 90% of the full frame, but as + * we currently don't even use 90% of the full frame, we may + * use the full usable time for periodic transfers. + */ +#define MAX_PERIODIC_BW(full_bw) full_bw + +/* -------------------------------------------------------------------------- */ + +struct c67x00_hcd { + spinlock_t lock; + struct c67x00_sie *sie; + unsigned int low_speed_ports; /* bitmask of low speed ports */ + unsigned int urb_count; + unsigned int urb_iso_count; + + struct list_head list[4]; /* iso, int, ctrl, bulk */ +#if PIPE_BULK != 3 +#error "Sanity check failed, this code presumes PIPE_... to range from 0 to 3" +#endif + + /* USB bandwidth allocated to td_list */ + int bandwidth_allocated; + /* USB bandwidth allocated for isoc/int transfer */ + int periodic_bw_allocated; + struct list_head td_list; + int max_frame_bw; + + u16 td_base_addr; + u16 buf_base_addr; + u16 next_td_addr; + u16 next_buf_addr; + + struct work_struct work; + + struct completion endpoint_disable; + + u16 current_frame; + u16 last_frame; +}; + +static inline struct c67x00_hcd *hcd_to_c67x00_hcd(struct usb_hcd *hcd) +{ + return (struct c67x00_hcd *)(hcd->hcd_priv); +} + +static inline struct usb_hcd *c67x00_hcd_to_hcd(struct c67x00_hcd *c67x00) +{ + return container_of((void *)c67x00, struct usb_hcd, hcd_priv); +} + +/* --------------------------------------------------------------------- + * Functions used by c67x00-drv + */ + +int c67x00_hcd_probe(struct c67x00_sie *sie); +void c67x00_hcd_remove(struct c67x00_sie *sie); + +/* --------------------------------------------------------------------- + * Transfer Descriptor scheduling functions + */ +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); +void c67x00_endpoint_disable(struct usb_hcd *hcd, + struct usb_host_endpoint *ep); + +void c67x00_hcd_msg_received(struct c67x00_sie *sie, u16 msg); +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); + +#define c67x00_hcd_dev(x) (c67x00_hcd_to_hcd(x)->self.controller) + +#endif /* _USB_C67X00_HCD_H */ |