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/* SPDX-License-Identifier: GPL-2.0 */
/*
* xhci-dbc.h - xHCI debug capability early driver
*
* Copyright (C) 2016 Intel Corporation
*
* Author: Lu Baolu <baolu.lu@linux.intel.com>
*/
#ifndef __LINUX_XHCI_DBC_H
#define __LINUX_XHCI_DBC_H
#include <linux/types.h>
#include <linux/usb/ch9.h>
/*
* xHCI Debug Capability Register interfaces:
*/
struct xdbc_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 */
};
#define DEBUG_MAX_BURST(p) (((p) >> 16) & 0xff)
#define CTRL_DBC_RUN BIT(0)
#define CTRL_PORT_ENABLE BIT(1)
#define CTRL_HALT_OUT_TR BIT(2)
#define CTRL_HALT_IN_TR BIT(3)
#define CTRL_DBC_RUN_CHANGE BIT(4)
#define CTRL_DBC_ENABLE BIT(31)
#define DCST_DEBUG_PORT(p) (((p) >> 24) & 0xff)
#define PORTSC_CONN_STATUS BIT(0)
#define PORTSC_CONN_CHANGE BIT(17)
#define PORTSC_RESET_CHANGE BIT(21)
#define PORTSC_LINK_CHANGE BIT(22)
#define PORTSC_CONFIG_CHANGE BIT(23)
/*
* xHCI Debug Capability data structures:
*/
struct xdbc_trb {
__le32 field[4];
};
struct xdbc_erst_entry {
__le64 seg_addr;
__le32 seg_size;
__le32 __reserved_0;
};
struct xdbc_info_context {
__le64 string0;
__le64 manufacturer;
__le64 product;
__le64 serial;
__le32 length;
__le32 __reserved_0[7];
};
struct xdbc_ep_context {
__le32 ep_info1;
__le32 ep_info2;
__le64 deq;
__le32 tx_info;
__le32 __reserved_0[11];
};
struct xdbc_context {
struct xdbc_info_context info;
struct xdbc_ep_context out;
struct xdbc_ep_context in;
};
#define XDBC_INFO_CONTEXT_SIZE 48
#define XDBC_MAX_STRING_LENGTH 64
#define XDBC_STRING_MANUFACTURER "Linux Foundation"
#define XDBC_STRING_PRODUCT "Linux USB GDB Target"
#define XDBC_STRING_SERIAL "0001"
struct xdbc_strings {
char string0[XDBC_MAX_STRING_LENGTH];
char manufacturer[XDBC_MAX_STRING_LENGTH];
char product[XDBC_MAX_STRING_LENGTH];
char serial[XDBC_MAX_STRING_LENGTH];
};
#define XDBC_PROTOCOL 1 /* GNU Remote Debug Command Set */
#define XDBC_VENDOR_ID 0x1d6b /* Linux Foundation 0x1d6b */
#define XDBC_PRODUCT_ID 0x0011 /* __le16 idProduct; device 0011 */
#define XDBC_DEVICE_REV 0x0010 /* 0.10 */
/*
* xHCI Debug Capability software state structures:
*/
struct xdbc_segment {
struct xdbc_trb *trbs;
dma_addr_t dma;
};
#define XDBC_TRBS_PER_SEGMENT 256
struct xdbc_ring {
struct xdbc_segment *segment;
struct xdbc_trb *enqueue;
struct xdbc_trb *dequeue;
u32 cycle_state;
};
/*
* These are the "Endpoint ID" (also known as "Context Index") values for the
* OUT Transfer Ring and the IN Transfer Ring of a Debug Capability Context data
* structure.
* According to the "eXtensible Host Controller Interface for Universal Serial
* Bus (xHCI)" specification, section "7.6.3.2 Endpoint Contexts and Transfer
* Rings", these should be 0 and 1, and those are the values AMD machines give
* you; but Intel machines seem to use the formula from section "4.5.1 Device
* Context Index", which is supposed to be used for the Device Context only.
* Luckily the values from Intel don't overlap with those from AMD, so we can
* just test for both.
*/
#define XDBC_EPID_OUT 0
#define XDBC_EPID_IN 1
#define XDBC_EPID_OUT_INTEL 2
#define XDBC_EPID_IN_INTEL 3
struct xdbc_state {
u16 vendor;
u16 device;
u32 bus;
u32 dev;
u32 func;
void __iomem *xhci_base;
u64 xhci_start;
size_t xhci_length;
int port_number;
/* DbC register base */
struct xdbc_regs __iomem *xdbc_reg;
/* DbC table page */
dma_addr_t table_dma;
void *table_base;
/* event ring segment table */
dma_addr_t erst_dma;
size_t erst_size;
void *erst_base;
/* event ring segments */
struct xdbc_ring evt_ring;
struct xdbc_segment evt_seg;
/* debug capability contexts */
dma_addr_t dbcc_dma;
size_t dbcc_size;
void *dbcc_base;
/* descriptor strings */
dma_addr_t string_dma;
size_t string_size;
void *string_base;
/* bulk OUT endpoint */
struct xdbc_ring out_ring;
struct xdbc_segment out_seg;
void *out_buf;
dma_addr_t out_dma;
/* bulk IN endpoint */
struct xdbc_ring in_ring;
struct xdbc_segment in_seg;
void *in_buf;
dma_addr_t in_dma;
u32 flags;
/* spinlock for early_xdbc_write() reentrancy */
raw_spinlock_t lock;
};
#define XDBC_PCI_MAX_BUSES 256
#define XDBC_PCI_MAX_DEVICES 32
#define XDBC_PCI_MAX_FUNCTION 8
#define XDBC_TABLE_ENTRY_SIZE 64
#define XDBC_ERST_ENTRY_NUM 1
#define XDBC_DBCC_ENTRY_NUM 3
#define XDBC_STRING_ENTRY_NUM 4
/* Bits definitions for xdbc_state.flags: */
#define XDBC_FLAGS_INITIALIZED BIT(0)
#define XDBC_FLAGS_IN_STALL BIT(1)
#define XDBC_FLAGS_OUT_STALL BIT(2)
#define XDBC_FLAGS_IN_PROCESS BIT(3)
#define XDBC_FLAGS_OUT_PROCESS BIT(4)
#define XDBC_FLAGS_CONFIGURED BIT(5)
#define XDBC_MAX_PACKET 1024
/* Door bell target: */
#define OUT_EP_DOORBELL 0
#define IN_EP_DOORBELL 1
#define DOOR_BELL_TARGET(p) (((p) & 0xff) << 8)
#define xdbc_read64(regs) xhci_read_64(NULL, (regs))
#define xdbc_write64(val, regs) xhci_write_64(NULL, (val), (regs))
#endif /* __LINUX_XHCI_DBC_H */
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