1/* SPDX-License-Identifier: GPL-2.0 */
  2/**
  3 * xhci-dbgcap.h - xHCI debug capability support
  4 *
  5 * Copyright (C) 2017 Intel Corporation
  6 *
  7 * Author: Lu Baolu <baolu.lu@linux.intel.com>
  8 */
  9#ifndef __LINUX_XHCI_DBGCAP_H
 10#define __LINUX_XHCI_DBGCAP_H
 11
 12#include <linux/tty.h>
 13#include <linux/kfifo.h>
 14
 15struct dbc_regs {
 16	__le32	capability;
 17	__le32	doorbell;
 18	__le32	ersts;		/* Event Ring Segment Table Size*/
 19	__le32	__reserved_0;	/* 0c~0f reserved bits */
 20	__le64	erstba;		/* Event Ring Segment Table Base Address */
 21	__le64	erdp;		/* Event Ring Dequeue Pointer */
 22	__le32	control;
 23	__le32	status;
 24	__le32	portsc;		/* Port status and control */
 25	__le32	__reserved_1;	/* 2b~28 reserved bits */
 26	__le64	dccp;		/* Debug Capability Context Pointer */
 27	__le32	devinfo1;	/* Device Descriptor Info Register 1 */
 28	__le32	devinfo2;	/* Device Descriptor Info Register 2 */
 29};
 30
 31struct dbc_info_context {
 32	__le64	string0;
 33	__le64	manufacturer;
 34	__le64	product;
 35	__le64	serial;
 36	__le32	length;
 37	__le32	__reserved_0[7];
 38};
 39
 40#define DBC_CTRL_DBC_RUN		BIT(0)
 41#define DBC_CTRL_PORT_ENABLE		BIT(1)
 42#define DBC_CTRL_HALT_OUT_TR		BIT(2)
 43#define DBC_CTRL_HALT_IN_TR		BIT(3)
 44#define DBC_CTRL_DBC_RUN_CHANGE		BIT(4)
 45#define DBC_CTRL_DBC_ENABLE		BIT(31)
 46#define DBC_CTRL_MAXBURST(p)		(((p) >> 16) & 0xff)
 47#define DBC_DOOR_BELL_TARGET(p)		(((p) & 0xff) << 8)
 48
 49#define DBC_MAX_PACKET			1024
 50#define DBC_MAX_STRING_LENGTH		64
 51#define DBC_STRING_MANUFACTURER		"Linux Foundation"
 52#define DBC_STRING_PRODUCT		"Linux USB Debug Target"
 53#define DBC_STRING_SERIAL		"0001"
 54#define	DBC_CONTEXT_SIZE		64
 55
 56/*
 57 * Port status:
 58 */
 59#define DBC_PORTSC_CONN_STATUS		BIT(0)
 60#define DBC_PORTSC_PORT_ENABLED		BIT(1)
 61#define DBC_PORTSC_CONN_CHANGE		BIT(17)
 62#define DBC_PORTSC_RESET_CHANGE		BIT(21)
 63#define DBC_PORTSC_LINK_CHANGE		BIT(22)
 64#define DBC_PORTSC_CONFIG_CHANGE	BIT(23)
 65
 66struct dbc_str_descs {
 67	char	string0[DBC_MAX_STRING_LENGTH];
 68	char	manufacturer[DBC_MAX_STRING_LENGTH];
 69	char	product[DBC_MAX_STRING_LENGTH];
 70	char	serial[DBC_MAX_STRING_LENGTH];
 71};
 72
 73#define DBC_PROTOCOL			1	/* GNU Remote Debug Command */
 74#define DBC_VENDOR_ID			0x1d6b	/* Linux Foundation 0x1d6b */
 75#define DBC_PRODUCT_ID			0x0010	/* device 0010 */
 76#define DBC_DEVICE_REV			0x0010	/* 0.10 */
 77
 78enum dbc_state {
 79	DS_DISABLED = 0,
 80	DS_INITIALIZED,
 81	DS_ENABLED,
 82	DS_CONNECTED,
 83	DS_CONFIGURED,
 84	DS_STALLED,
 85	DS_MAX
 86};
 87
 88struct dbc_ep {
 89	struct xhci_dbc			*dbc;
 90	struct list_head		list_pending;
 91	struct xhci_ring		*ring;
 92	unsigned int			direction:1;
 93};
 94
 95#define DBC_QUEUE_SIZE			16
 96#define DBC_WRITE_BUF_SIZE		8192
 97
 98/*
 99 * Private structure for DbC hardware state:
100 */
101struct dbc_port {
102	struct tty_port			port;
103	spinlock_t			port_lock;	/* port access */
104	int				minor;
105
106	struct list_head		read_pool;
107	struct list_head		read_queue;
108	unsigned int			n_read;
109	struct tasklet_struct		push;
110
111	struct list_head		write_pool;
112	struct kfifo			write_fifo;
113
114	bool				registered;
115};
116
117struct dbc_driver {
118	int (*configure)(struct xhci_dbc *dbc);
119	void (*disconnect)(struct xhci_dbc *dbc);
120};
121
122struct xhci_dbc {
123	spinlock_t			lock;		/* device access */
124	struct device			*dev;
125	struct xhci_hcd			*xhci;
126	struct dbc_regs __iomem		*regs;
127	struct xhci_ring		*ring_evt;
128	struct xhci_ring		*ring_in;
129	struct xhci_ring		*ring_out;
130	struct xhci_erst		erst;
131	struct xhci_container_ctx	*ctx;
132
133	struct dbc_str_descs		*string;
134	dma_addr_t			string_dma;
135	size_t				string_size;
136	u16				idVendor;
137	u16				idProduct;
138	u16				bcdDevice;
139	u8				bInterfaceProtocol;
140
141	enum dbc_state			state;
142	struct delayed_work		event_work;
143	unsigned			resume_required:1;
144	struct dbc_ep			eps[2];
145
146	const struct dbc_driver		*driver;
147	void				*priv;
148};
149
150struct dbc_request {
151	void				*buf;
152	unsigned int			length;
153	dma_addr_t			dma;
154	void				(*complete)(struct xhci_dbc *dbc,
155						    struct dbc_request *req);
156	struct list_head		list_pool;
157	int				status;
158	unsigned int			actual;
159
160	struct xhci_dbc			*dbc;
161	struct list_head		list_pending;
162	dma_addr_t			trb_dma;
163	union xhci_trb			*trb;
164	unsigned			direction:1;
165};
166
167#define dbc_bulkout_ctx(d)		\
168	((struct xhci_ep_ctx *)((d)->ctx->bytes + DBC_CONTEXT_SIZE))
169#define dbc_bulkin_ctx(d)		\
170	((struct xhci_ep_ctx *)((d)->ctx->bytes + DBC_CONTEXT_SIZE * 2))
171#define dbc_bulkout_enq(d)		\
172	xhci_trb_virt_to_dma((d)->ring_out->enq_seg, (d)->ring_out->enqueue)
173#define dbc_bulkin_enq(d)		\
174	xhci_trb_virt_to_dma((d)->ring_in->enq_seg, (d)->ring_in->enqueue)
175#define dbc_epctx_info2(t, p, b)	\
176	cpu_to_le32(EP_TYPE(t) | MAX_PACKET(p) | MAX_BURST(b))
177#define dbc_ep_dma_direction(d)		\
178	((d)->direction ? DMA_FROM_DEVICE : DMA_TO_DEVICE)
179
180#define BULK_OUT			0
181#define BULK_IN				1
182#define EPID_OUT			2
183#define EPID_IN				3
184
185enum evtreturn {
186	EVT_ERR	= -1,
187	EVT_DONE,
188	EVT_GSER,
189	EVT_DISC,
190};
191
192static inline struct dbc_ep *get_in_ep(struct xhci_dbc *dbc)
193{
194	return &dbc->eps[BULK_IN];
195}
196
197static inline struct dbc_ep *get_out_ep(struct xhci_dbc *dbc)
198{
199	return &dbc->eps[BULK_OUT];
200}
201
202#ifdef CONFIG_USB_XHCI_DBGCAP
203int xhci_create_dbc_dev(struct xhci_hcd *xhci);
204void xhci_remove_dbc_dev(struct xhci_hcd *xhci);
205int xhci_dbc_init(void);
206void xhci_dbc_exit(void);
207int dbc_tty_init(void);
208void dbc_tty_exit(void);
209int xhci_dbc_tty_probe(struct device *dev, void __iomem *res, struct xhci_hcd *xhci);
210void xhci_dbc_tty_remove(struct xhci_dbc *dbc);
211struct xhci_dbc *xhci_alloc_dbc(struct device *dev, void __iomem *res,
212				 const struct dbc_driver *driver);
213void xhci_dbc_remove(struct xhci_dbc *dbc);
214struct dbc_request *dbc_alloc_request(struct xhci_dbc *dbc,
215				      unsigned int direction,
216				      gfp_t flags);
217void dbc_free_request(struct dbc_request *req);
218int dbc_ep_queue(struct dbc_request *req);
219#ifdef CONFIG_PM
220int xhci_dbc_suspend(struct xhci_hcd *xhci);
221int xhci_dbc_resume(struct xhci_hcd *xhci);
222#endif /* CONFIG_PM */
223#else
224static inline int xhci_create_dbc_dev(struct xhci_hcd *xhci)
225{
226	return 0;
227}
228
229static inline void xhci_remove_dbc_dev(struct xhci_hcd *xhci)
230{
231}
232static inline int xhci_dbc_init(void)
233{
234	return 0;
235}
236static inline void xhci_dbc_exit(void)
237{
238}
239static inline int xhci_dbc_suspend(struct xhci_hcd *xhci)
240{
241	return 0;
242}
243
244static inline int xhci_dbc_resume(struct xhci_hcd *xhci)
245{
246	return 0;
247}
248#endif /* CONFIG_USB_XHCI_DBGCAP */
249#endif /* __LINUX_XHCI_DBGCAP_H */