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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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eb70e5ab8f
This adds EHCI host support to the chipidea driver. We want it to be part of the hdrc driver and not a standalone (sub-)driver module, as the structure of ehci-hcd.c suggests, so for chipidea controller we hack it to not provide platform-related code, but only the ehci hcd. The ehci-platform driver won't work for us here too, because the controller uses the same registers for both device and host mode and also otg-related bits, so it's not really possible to put ehci registers into a separate resource. This is not a pretty solution, but the alternative is exporting symbols from the chipidea driver to a ehci-chipidea driver and doing all the module refcounting. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
317 lines
7.6 KiB
C
317 lines
7.6 KiB
C
/*
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* ci.h - common structures, functions, and macros of the ChipIdea driver
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*
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* Copyright (C) 2008 Chipidea - MIPS Technologies, Inc. All rights reserved.
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*
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* Author: David Lopo
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __DRIVERS_USB_CHIPIDEA_CI_H
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#define __DRIVERS_USB_CHIPIDEA_CI_H
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#include <linux/list.h>
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#include <linux/irqreturn.h>
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#include <linux/usb.h>
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#include <linux/usb/gadget.h>
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/******************************************************************************
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* DEFINE
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*****************************************************************************/
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#define DMA_ADDR_INVALID (~(dma_addr_t)0)
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#define CI13XXX_PAGE_SIZE 4096ul /* page size for TD's */
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#define ENDPT_MAX 32
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/******************************************************************************
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* STRUCTURES
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*****************************************************************************/
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/**
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* struct ci13xxx_ep - endpoint representation
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* @ep: endpoint structure for gadget drivers
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* @dir: endpoint direction (TX/RX)
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* @num: endpoint number
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* @type: endpoint type
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* @name: string description of the endpoint
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* @qh: queue head for this endpoint
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* @wedge: is the endpoint wedged
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* @udc: pointer to the controller
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* @lock: pointer to controller's spinlock
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* @device: pointer to gadget's struct device
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* @td_pool: pointer to controller's TD pool
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*/
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struct ci13xxx_ep {
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struct usb_ep ep;
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u8 dir;
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u8 num;
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u8 type;
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char name[16];
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struct {
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struct list_head queue;
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struct ci13xxx_qh *ptr;
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dma_addr_t dma;
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} qh;
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int wedge;
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/* global resources */
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struct ci13xxx *udc;
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spinlock_t *lock;
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struct device *device;
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struct dma_pool *td_pool;
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};
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enum ci_role {
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CI_ROLE_HOST = 0,
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CI_ROLE_GADGET,
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CI_ROLE_END,
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};
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/**
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* struct ci_role_driver - host/gadget role driver
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* start: start this role
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* stop: stop this role
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* irq: irq handler for this role
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* name: role name string (host/gadget)
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*/
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struct ci_role_driver {
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int (*start)(struct ci13xxx *);
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void (*stop)(struct ci13xxx *);
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irqreturn_t (*irq)(struct ci13xxx *);
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const char *name;
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};
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/**
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* struct hw_bank - hardware register mapping representation
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* @lpm: set if the device is LPM capable
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* @phys: physical address of the controller's registers
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* @abs: absolute address of the beginning of register window
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* @cap: capability registers
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* @op: operational registers
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* @size: size of the register window
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* @regmap: register lookup table
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*/
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struct hw_bank {
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unsigned lpm;
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resource_size_t phys;
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void __iomem *abs;
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void __iomem *cap;
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void __iomem *op;
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size_t size;
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void __iomem **regmap;
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};
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/**
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* struct ci13xxx - chipidea device representation
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* @dev: pointer to parent device
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* @lock: access synchronization
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* @hw_bank: hardware register mapping
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* @irq: IRQ number
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* @roles: array of supported roles for this controller
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* @role: current role
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* @is_otg: if the device is otg-capable
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* @work: work for role changing
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* @wq: workqueue thread
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* @qh_pool: allocation pool for queue heads
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* @td_pool: allocation pool for transfer descriptors
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* @gadget: device side representation for peripheral controller
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* @driver: gadget driver
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* @hw_ep_max: total number of endpoints supported by hardware
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* @ci13xxx_ep: array of endpoints
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* @ep0_dir: ep0 direction
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* @ep0out: pointer to ep0 OUT endpoint
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* @ep0in: pointer to ep0 IN endpoint
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* @status: ep0 status request
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* @setaddr: if we should set the address on status completion
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* @address: usb address received from the host
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* @remote_wakeup: host-enabled remote wakeup
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* @suspended: suspended by host
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* @test_mode: the selected test mode
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* @udc_driver: platform specific information supplied by parent device
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* @vbus_active: is VBUS active
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* @transceiver: pointer to USB PHY, if any
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* @hcd: pointer to usb_hcd for ehci host driver
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*/
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struct ci13xxx {
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struct device *dev;
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spinlock_t lock;
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struct hw_bank hw_bank;
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int irq;
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struct ci_role_driver *roles[CI_ROLE_END];
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enum ci_role role;
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bool is_otg;
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struct work_struct work;
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struct workqueue_struct *wq;
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struct dma_pool *qh_pool;
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struct dma_pool *td_pool;
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struct usb_gadget gadget;
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struct usb_gadget_driver *driver;
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unsigned hw_ep_max;
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struct ci13xxx_ep ci13xxx_ep[ENDPT_MAX];
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u32 ep0_dir;
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struct ci13xxx_ep *ep0out, *ep0in;
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struct usb_request *status;
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bool setaddr;
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u8 address;
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u8 remote_wakeup;
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u8 suspended;
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u8 test_mode;
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struct ci13xxx_udc_driver *udc_driver;
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int vbus_active;
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struct usb_phy *transceiver;
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struct usb_hcd *hcd;
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};
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static inline struct ci_role_driver *ci_role(struct ci13xxx *ci)
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{
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BUG_ON(ci->role >= CI_ROLE_END || !ci->roles[ci->role]);
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return ci->roles[ci->role];
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}
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static inline int ci_role_start(struct ci13xxx *ci, enum ci_role role)
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{
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int ret;
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if (role >= CI_ROLE_END)
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return -EINVAL;
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if (!ci->roles[role])
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return -ENXIO;
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ret = ci->roles[role]->start(ci);
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if (!ret)
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ci->role = role;
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return ret;
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}
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static inline void ci_role_stop(struct ci13xxx *ci)
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{
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enum ci_role role = ci->role;
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if (role == CI_ROLE_END)
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return;
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ci->role = CI_ROLE_END;
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ci->roles[role]->stop(ci);
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}
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/******************************************************************************
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* REGISTERS
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*****************************************************************************/
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/* register size */
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#define REG_BITS (32)
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/* register indices */
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enum ci13xxx_regs {
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CAP_CAPLENGTH,
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CAP_HCCPARAMS,
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CAP_DCCPARAMS,
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CAP_TESTMODE,
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CAP_LAST = CAP_TESTMODE,
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OP_USBCMD,
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OP_USBSTS,
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OP_USBINTR,
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OP_DEVICEADDR,
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OP_ENDPTLISTADDR,
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OP_PORTSC,
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OP_DEVLC,
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OP_OTGSC,
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OP_USBMODE,
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OP_ENDPTSETUPSTAT,
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OP_ENDPTPRIME,
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OP_ENDPTFLUSH,
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OP_ENDPTSTAT,
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OP_ENDPTCOMPLETE,
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OP_ENDPTCTRL,
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/* endptctrl1..15 follow */
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OP_LAST = OP_ENDPTCTRL + ENDPT_MAX / 2,
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};
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/**
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* ffs_nr: find first (least significant) bit set
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* @x: the word to search
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*
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* This function returns bit number (instead of position)
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*/
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static inline int ffs_nr(u32 x)
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{
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int n = ffs(x);
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return n ? n-1 : 32;
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}
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/**
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* hw_read: reads from a hw register
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* @reg: register index
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* @mask: bitfield mask
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*
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* This function returns register contents
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*/
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static inline u32 hw_read(struct ci13xxx *udc, enum ci13xxx_regs reg, u32 mask)
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{
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return ioread32(udc->hw_bank.regmap[reg]) & mask;
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}
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/**
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* hw_write: writes to a hw register
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* @reg: register index
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* @mask: bitfield mask
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* @data: new value
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*/
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static inline void hw_write(struct ci13xxx *udc, enum ci13xxx_regs reg,
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u32 mask, u32 data)
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{
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if (~mask)
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data = (ioread32(udc->hw_bank.regmap[reg]) & ~mask)
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| (data & mask);
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iowrite32(data, udc->hw_bank.regmap[reg]);
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}
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/**
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* hw_test_and_clear: tests & clears a hw register
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* @reg: register index
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* @mask: bitfield mask
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*
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* This function returns register contents
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*/
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static inline u32 hw_test_and_clear(struct ci13xxx *udc, enum ci13xxx_regs reg,
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u32 mask)
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{
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u32 val = ioread32(udc->hw_bank.regmap[reg]) & mask;
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iowrite32(val, udc->hw_bank.regmap[reg]);
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return val;
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}
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/**
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* hw_test_and_write: tests & writes a hw register
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* @reg: register index
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* @mask: bitfield mask
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* @data: new value
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*
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* This function returns register contents
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*/
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static inline u32 hw_test_and_write(struct ci13xxx *udc, enum ci13xxx_regs reg,
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u32 mask, u32 data)
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{
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u32 val = hw_read(udc, reg, ~0);
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hw_write(udc, reg, mask, data);
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return (val & mask) >> ffs_nr(mask);
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}
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int hw_device_reset(struct ci13xxx *ci, u32 mode);
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int hw_port_test_set(struct ci13xxx *ci, u8 mode);
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u8 hw_port_test_get(struct ci13xxx *ci);
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#endif /* __DRIVERS_USB_CHIPIDEA_CI_H */
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