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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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647b2d9c61
Save the last event in the otg_transceiver so that it can used in the musb driver and gadget driver to configure the musb and enable the vbus for host mode and OTG mode, if the device is connected during boot. Signed-off-by: Hema HK <hemahk@ti.com> Cc: Tony Lindgren <tony@atomide.com> Cc: Paul Walmsley <paul@pwsan.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
251 lines
5.9 KiB
C
251 lines
5.9 KiB
C
/* USB OTG (On The Go) defines */
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/*
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*
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* These APIs may be used between USB controllers. USB device drivers
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* (for either host or peripheral roles) don't use these calls; they
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* continue to use just usb_device and usb_gadget.
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*/
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#ifndef __LINUX_USB_OTG_H
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#define __LINUX_USB_OTG_H
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#include <linux/notifier.h>
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/* OTG defines lots of enumeration states before device reset */
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enum usb_otg_state {
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OTG_STATE_UNDEFINED = 0,
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/* single-role peripheral, and dual-role default-b */
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OTG_STATE_B_IDLE,
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OTG_STATE_B_SRP_INIT,
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OTG_STATE_B_PERIPHERAL,
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/* extra dual-role default-b states */
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OTG_STATE_B_WAIT_ACON,
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OTG_STATE_B_HOST,
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/* dual-role default-a */
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OTG_STATE_A_IDLE,
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OTG_STATE_A_WAIT_VRISE,
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OTG_STATE_A_WAIT_BCON,
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OTG_STATE_A_HOST,
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OTG_STATE_A_SUSPEND,
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OTG_STATE_A_PERIPHERAL,
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OTG_STATE_A_WAIT_VFALL,
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OTG_STATE_A_VBUS_ERR,
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};
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enum usb_xceiv_events {
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USB_EVENT_NONE, /* no events or cable disconnected */
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USB_EVENT_VBUS, /* vbus valid event */
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USB_EVENT_ID, /* id was grounded */
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USB_EVENT_CHARGER, /* usb dedicated charger */
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USB_EVENT_ENUMERATED, /* gadget driver enumerated */
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};
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struct otg_transceiver;
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/* for transceivers connected thru an ULPI interface, the user must
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* provide access ops
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*/
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struct otg_io_access_ops {
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int (*read)(struct otg_transceiver *otg, u32 reg);
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int (*write)(struct otg_transceiver *otg, u32 val, u32 reg);
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};
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/*
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* the otg driver needs to interact with both device side and host side
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* usb controllers. it decides which controller is active at a given
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* moment, using the transceiver, ID signal, HNP and sometimes static
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* configuration information (including "board isn't wired for otg").
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*/
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struct otg_transceiver {
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struct device *dev;
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const char *label;
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unsigned int flags;
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u8 default_a;
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enum usb_otg_state state;
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enum usb_xceiv_events last_event;
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struct usb_bus *host;
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struct usb_gadget *gadget;
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struct otg_io_access_ops *io_ops;
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void __iomem *io_priv;
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/* for notification of usb_xceiv_events */
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struct blocking_notifier_head notifier;
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/* to pass extra port status to the root hub */
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u16 port_status;
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u16 port_change;
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/* initialize/shutdown the OTG controller */
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int (*init)(struct otg_transceiver *otg);
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void (*shutdown)(struct otg_transceiver *otg);
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/* bind/unbind the host controller */
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int (*set_host)(struct otg_transceiver *otg,
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struct usb_bus *host);
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/* bind/unbind the peripheral controller */
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int (*set_peripheral)(struct otg_transceiver *otg,
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struct usb_gadget *gadget);
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/* effective for B devices, ignored for A-peripheral */
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int (*set_power)(struct otg_transceiver *otg,
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unsigned mA);
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/* effective for A-peripheral, ignored for B devices */
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int (*set_vbus)(struct otg_transceiver *otg,
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bool enabled);
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/* for non-OTG B devices: set transceiver into suspend mode */
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int (*set_suspend)(struct otg_transceiver *otg,
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int suspend);
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/* for B devices only: start session with A-Host */
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int (*start_srp)(struct otg_transceiver *otg);
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/* start or continue HNP role switch */
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int (*start_hnp)(struct otg_transceiver *otg);
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};
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/* for board-specific init logic */
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extern int otg_set_transceiver(struct otg_transceiver *);
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#if defined(CONFIG_NOP_USB_XCEIV) || (defined(CONFIG_NOP_USB_XCEIV_MODULE) && defined(MODULE))
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/* sometimes transceivers are accessed only through e.g. ULPI */
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extern void usb_nop_xceiv_register(void);
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extern void usb_nop_xceiv_unregister(void);
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#else
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static inline void usb_nop_xceiv_register(void)
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{
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}
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static inline void usb_nop_xceiv_unregister(void)
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{
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}
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#endif
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/* helpers for direct access thru low-level io interface */
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static inline int otg_io_read(struct otg_transceiver *otg, u32 reg)
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{
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if (otg->io_ops && otg->io_ops->read)
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return otg->io_ops->read(otg, reg);
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return -EINVAL;
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}
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static inline int otg_io_write(struct otg_transceiver *otg, u32 val, u32 reg)
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{
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if (otg->io_ops && otg->io_ops->write)
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return otg->io_ops->write(otg, val, reg);
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return -EINVAL;
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}
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static inline int
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otg_init(struct otg_transceiver *otg)
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{
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if (otg->init)
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return otg->init(otg);
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return 0;
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}
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static inline void
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otg_shutdown(struct otg_transceiver *otg)
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{
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if (otg->shutdown)
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otg->shutdown(otg);
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}
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/* for usb host and peripheral controller drivers */
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#ifdef CONFIG_USB_OTG_UTILS
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extern struct otg_transceiver *otg_get_transceiver(void);
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extern void otg_put_transceiver(struct otg_transceiver *);
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#else
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static inline struct otg_transceiver *otg_get_transceiver(void)
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{
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return NULL;
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}
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static inline void otg_put_transceiver(struct otg_transceiver *x)
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{
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}
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#endif
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/* Context: can sleep */
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static inline int
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otg_start_hnp(struct otg_transceiver *otg)
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{
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return otg->start_hnp(otg);
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}
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/* Context: can sleep */
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static inline int
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otg_set_vbus(struct otg_transceiver *otg, bool enabled)
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{
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return otg->set_vbus(otg, enabled);
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}
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/* for HCDs */
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static inline int
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otg_set_host(struct otg_transceiver *otg, struct usb_bus *host)
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{
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return otg->set_host(otg, host);
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}
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/* for usb peripheral controller drivers */
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/* Context: can sleep */
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static inline int
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otg_set_peripheral(struct otg_transceiver *otg, struct usb_gadget *periph)
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{
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return otg->set_peripheral(otg, periph);
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}
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static inline int
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otg_set_power(struct otg_transceiver *otg, unsigned mA)
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{
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return otg->set_power(otg, mA);
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}
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/* Context: can sleep */
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static inline int
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otg_set_suspend(struct otg_transceiver *otg, int suspend)
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{
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if (otg->set_suspend != NULL)
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return otg->set_suspend(otg, suspend);
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else
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return 0;
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}
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static inline int
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otg_start_srp(struct otg_transceiver *otg)
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{
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return otg->start_srp(otg);
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}
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/* notifiers */
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static inline int
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otg_register_notifier(struct otg_transceiver *otg, struct notifier_block *nb)
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{
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return blocking_notifier_chain_register(&otg->notifier, nb);
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}
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static inline void
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otg_unregister_notifier(struct otg_transceiver *otg, struct notifier_block *nb)
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{
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blocking_notifier_chain_unregister(&otg->notifier, nb);
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}
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/* for OTG controller drivers (and maybe other stuff) */
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extern int usb_bus_start_enum(struct usb_bus *bus, unsigned port_num);
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#endif /* __LINUX_USB_OTG_H */
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