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/* SPDX-License-Identifier: GPL-2.0 */
/**
* xhci-dbgcap.h - xHCI debug capability support
*
* Copyright (C) 2017 Intel Corporation
*
* Author: Lu Baolu <baolu.lu@linux.intel.com>
*/
#ifndef __LINUX_XHCI_DBGCAP_H
#define __LINUX_XHCI_DBGCAP_H
#include <linux/tty.h>
#include <linux/kfifo.h>
struct dbc_regs {
__le32 capability;
__le32 doorbell;
__le32 ersts; /* Event Ring Segment Table Size*/
__le32 __reserved_0; /* 0c~0f reserved bits */
__le64 erstba; /* Event Ring Segment Table Base Address */
__le64 erdp; /* Event Ring Dequeue Pointer */
__le32 control;
__le32 status;
__le32 portsc; /* Port status and control */
__le32 __reserved_1; /* 2b~28 reserved bits */
__le64 dccp; /* Debug Capability Context Pointer */
__le32 devinfo1; /* Device Descriptor Info Register 1 */
__le32 devinfo2; /* Device Descriptor Info Register 2 */
};
struct dbc_info_context {
__le64 string0;
__le64 manufacturer;
__le64 product;
__le64 serial;
__le32 length;
__le32 __reserved_0[7];
};
#define DBC_CTRL_DBC_RUN BIT(0)
#define DBC_CTRL_PORT_ENABLE BIT(1)
#define DBC_CTRL_HALT_OUT_TR BIT(2)
#define DBC_CTRL_HALT_IN_TR BIT(3)
#define DBC_CTRL_DBC_RUN_CHANGE BIT(4)
#define DBC_CTRL_DBC_ENABLE BIT(31)
#define DBC_CTRL_MAXBURST(p) (((p) >> 16) & 0xff)
#define DBC_DOOR_BELL_TARGET(p) (((p) & 0xff) << 8)
#define DBC_MAX_PACKET 1024
#define DBC_MAX_STRING_LENGTH 64
#define DBC_STRING_MANUFACTURER "Linux Foundation"
#define DBC_STRING_PRODUCT "Linux USB Debug Target"
#define DBC_STRING_SERIAL "0001"
#define DBC_CONTEXT_SIZE 64
/*
* Port status:
*/
#define DBC_PORTSC_CONN_STATUS BIT(0)
#define DBC_PORTSC_PORT_ENABLED BIT(1)
#define DBC_PORTSC_CONN_CHANGE BIT(17)
#define DBC_PORTSC_RESET_CHANGE BIT(21)
#define DBC_PORTSC_LINK_CHANGE BIT(22)
#define DBC_PORTSC_CONFIG_CHANGE BIT(23)
struct dbc_str_descs {
char string0[DBC_MAX_STRING_LENGTH];
char manufacturer[DBC_MAX_STRING_LENGTH];
char product[DBC_MAX_STRING_LENGTH];
char serial[DBC_MAX_STRING_LENGTH];
};
#define DBC_PROTOCOL 1 /* GNU Remote Debug Command */
#define DBC_VENDOR_ID 0x1d6b /* Linux Foundation 0x1d6b */
#define DBC_PRODUCT_ID 0x0010 /* device 0010 */
#define DBC_DEVICE_REV 0x0010 /* 0.10 */
enum dbc_state {
DS_DISABLED = 0,
DS_INITIALIZED,
DS_ENABLED,
DS_CONNECTED,
DS_CONFIGURED,
DS_STALLED,
};
struct dbc_ep {
struct xhci_dbc *dbc;
struct list_head list_pending;
struct xhci_ring *ring;
unsigned int direction:1;
};
#define DBC_QUEUE_SIZE 16
#define DBC_WRITE_BUF_SIZE 8192
/*
* Private structure for DbC hardware state:
*/
struct dbc_port {
struct tty_port port;
spinlock_t port_lock; /* port access */
struct list_head read_pool;
struct list_head read_queue;
unsigned int n_read;
struct tasklet_struct push;
struct list_head write_pool;
struct kfifo write_fifo;
bool registered;
};
struct dbc_driver {
int (*configure)(struct xhci_dbc *dbc);
void (*disconnect)(struct xhci_dbc *dbc);
};
struct xhci_dbc {
spinlock_t lock; /* device access */
struct device *dev;
struct xhci_hcd *xhci;
struct dbc_regs __iomem *regs;
struct xhci_ring *ring_evt;
struct xhci_ring *ring_in;
struct xhci_ring *ring_out;
struct xhci_erst erst;
struct xhci_container_ctx *ctx;
struct dbc_str_descs *string;
dma_addr_t string_dma;
size_t string_size;
enum dbc_state state;
struct delayed_work event_work;
unsigned resume_required:1;
struct dbc_ep eps[2];
const struct dbc_driver *driver;
void *priv;
};
struct dbc_request {
void *buf;
unsigned int length;
dma_addr_t dma;
void (*complete)(struct xhci_dbc *dbc,
struct dbc_request *req);
struct list_head list_pool;
int status;
unsigned int actual;
struct xhci_dbc *dbc;
struct list_head list_pending;
dma_addr_t trb_dma;
union xhci_trb *trb;
unsigned direction:1;
};
#define dbc_bulkout_ctx(d) \
((struct xhci_ep_ctx *)((d)->ctx->bytes + DBC_CONTEXT_SIZE))
#define dbc_bulkin_ctx(d) \
((struct xhci_ep_ctx *)((d)->ctx->bytes + DBC_CONTEXT_SIZE * 2))
#define dbc_bulkout_enq(d) \
xhci_trb_virt_to_dma((d)->ring_out->enq_seg, (d)->ring_out->enqueue)
#define dbc_bulkin_enq(d) \
xhci_trb_virt_to_dma((d)->ring_in->enq_seg, (d)->ring_in->enqueue)
#define dbc_epctx_info2(t, p, b) \
cpu_to_le32(EP_TYPE(t) | MAX_PACKET(p) | MAX_BURST(b))
#define dbc_ep_dma_direction(d) \
((d)->direction ? DMA_FROM_DEVICE : DMA_TO_DEVICE)
#define BULK_OUT 0
#define BULK_IN 1
#define EPID_OUT 2
#define EPID_IN 3
enum evtreturn {
EVT_ERR = -1,
EVT_DONE,
EVT_GSER,
EVT_DISC,
};
static inline struct dbc_ep *get_in_ep(struct xhci_dbc *dbc)
{
return &dbc->eps[BULK_IN];
}
static inline struct dbc_ep *get_out_ep(struct xhci_dbc *dbc)
{
return &dbc->eps[BULK_OUT];
}
#ifdef CONFIG_USB_XHCI_DBGCAP
int xhci_dbc_init(struct xhci_hcd *xhci);
void xhci_dbc_exit(struct xhci_hcd *xhci);
int xhci_dbc_tty_probe(struct xhci_hcd *xhci);
void xhci_dbc_tty_remove(struct xhci_dbc *dbc);
struct dbc_request *dbc_alloc_request(struct xhci_dbc *dbc,
unsigned int direction,
gfp_t flags);
void dbc_free_request(struct dbc_request *req);
int dbc_ep_queue(struct dbc_request *req);
#ifdef CONFIG_PM
int xhci_dbc_suspend(struct xhci_hcd *xhci);
int xhci_dbc_resume(struct xhci_hcd *xhci);
#endif /* CONFIG_PM */
#else
static inline int xhci_dbc_init(struct xhci_hcd *xhci)
{
return 0;
}
static inline void xhci_dbc_exit(struct xhci_hcd *xhci)
{
}
static inline int xhci_dbc_suspend(struct xhci_hcd *xhci)
{
return 0;
}
static inline int xhci_dbc_resume(struct xhci_hcd *xhci)
{
return 0;
}
#endif /* CONFIG_USB_XHCI_DBGCAP */
#endif /* __LINUX_XHCI_DBGCAP_H */
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