drivers/usb/host/xhci-dbgcap.h

   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
  15 struct 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
  31 struct 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
  66 struct 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
  78 enum dbc_state {
  79         DS_DISABLED = 0,
  80         DS_INITIALIZED,
  81         DS_ENABLED,
  82         DS_CONNECTED,
  83         DS_CONFIGURED,
  84         DS_STALLED,
  85 };
  86
  87 struct dbc_ep {
  88         struct xhci_dbc                 *dbc;
  89         struct list_head                list_pending;
  90         struct xhci_ring                *ring;
  91         unsigned int                    direction:1;
  92 };
  93
  94 #define DBC_QUEUE_SIZE                  16
  95 #define DBC_WRITE_BUF_SIZE              8192
  96
  97 /*
  98  * Private structure for DbC hardware state:
  99  */
 100 struct dbc_port {
 101         struct tty_port                 port;
 102         spinlock_t                      port_lock;      /* port access */
 103
 104         struct list_head                read_pool;
 105         struct list_head                read_queue;
 106         unsigned int                    n_read;
 107         struct tasklet_struct           push;
 108
 109         struct list_head                write_pool;
 110         struct kfifo                    write_fifo;
 111
 112         bool                            registered;
 113 };
 114
 115 struct dbc_driver {
 116         int (*configure)(struct xhci_dbc *dbc);
 117         void (*disconnect)(struct xhci_dbc *dbc);
 118 };
 119
 120 struct xhci_dbc {
 121         spinlock_t                      lock;           /* device access */
 122         struct device                   *dev;
 123         struct xhci_hcd                 *xhci;
 124         struct dbc_regs __iomem         *regs;
 125         struct xhci_ring                *ring_evt;
 126         struct xhci_ring                *ring_in;
 127         struct xhci_ring                *ring_out;
 128         struct xhci_erst                erst;
 129         struct xhci_container_ctx       *ctx;
 130
 131         struct dbc_str_descs            *string;
 132         dma_addr_t                      string_dma;
 133         size_t                          string_size;
 134
 135         enum dbc_state                  state;
 136         struct delayed_work             event_work;
 137         unsigned                        resume_required:1;
 138         struct dbc_ep                   eps[2];
 139
 140         const struct dbc_driver         *driver;
 141         void                            *priv;
 142 };
 143
 144 struct dbc_request {
 145         void                            *buf;
 146         unsigned int                    length;
 147         dma_addr_t                      dma;
 148         void                            (*complete)(struct xhci_dbc *dbc,
 149                                                     struct dbc_request *req);
 150         struct list_head                list_pool;
 151         int                             status;
 152         unsigned int                    actual;
 153
 154         struct xhci_dbc                 *dbc;
 155         struct list_head                list_pending;
 156         dma_addr_t                      trb_dma;
 157         union xhci_trb                  *trb;
 158         unsigned                        direction:1;
 159 };
 160
 161 #define dbc_bulkout_ctx(d)              \
 162         ((struct xhci_ep_ctx *)((d)->ctx->bytes + DBC_CONTEXT_SIZE))
 163 #define dbc_bulkin_ctx(d)               \
 164         ((struct xhci_ep_ctx *)((d)->ctx->bytes + DBC_CONTEXT_SIZE * 2))
 165 #define dbc_bulkout_enq(d)              \
 166         xhci_trb_virt_to_dma((d)->ring_out->enq_seg, (d)->ring_out->enqueue)
 167 #define dbc_bulkin_enq(d)               \
 168         xhci_trb_virt_to_dma((d)->ring_in->enq_seg, (d)->ring_in->enqueue)
 169 #define dbc_epctx_info2(t, p, b)        \
 170         cpu_to_le32(EP_TYPE(t) | MAX_PACKET(p) | MAX_BURST(b))
 171 #define dbc_ep_dma_direction(d)         \
 172         ((d)->direction ? DMA_FROM_DEVICE : DMA_TO_DEVICE)
 173
 174 #define BULK_OUT                        0
 175 #define BULK_IN                         1
 176 #define EPID_OUT                        2
 177 #define EPID_IN                         3
 178
 179 enum evtreturn {
 180         EVT_ERR = -1,
 181         EVT_DONE,
 182         EVT_GSER,
 183         EVT_DISC,
 184 };
 185
 186 static inline struct dbc_ep *get_in_ep(struct xhci_dbc *dbc)
 187 {
 188         return &dbc->eps[BULK_IN];
 189 }
 190
 191 static inline struct dbc_ep *get_out_ep(struct xhci_dbc *dbc)
 192 {
 193         return &dbc->eps[BULK_OUT];
 194 }
 195
 196 #ifdef CONFIG_USB_XHCI_DBGCAP
 197 int xhci_dbc_init(struct xhci_hcd *xhci);
 198 void xhci_dbc_exit(struct xhci_hcd *xhci);
 199 int xhci_dbc_tty_probe(struct xhci_hcd *xhci);
 200 void xhci_dbc_tty_remove(struct xhci_dbc *dbc);
 201 struct dbc_request *dbc_alloc_request(struct xhci_dbc *dbc,
 202                                       unsigned int direction,
 203                                       gfp_t flags);
 204 void dbc_free_request(struct dbc_request *req);
 205 int dbc_ep_queue(struct dbc_request *req);
 206 #ifdef CONFIG_PM
 207 int xhci_dbc_suspend(struct xhci_hcd *xhci);
 208 int xhci_dbc_resume(struct xhci_hcd *xhci);
 209 #endif /* CONFIG_PM */
 210 #else
 211 static inline int xhci_dbc_init(struct xhci_hcd *xhci)
 212 {
 213         return 0;
 214 }
 215
 216 static inline void xhci_dbc_exit(struct xhci_hcd *xhci)
 217 {
 218 }
 219
 220 static inline int xhci_dbc_suspend(struct xhci_hcd *xhci)
 221 {
 222         return 0;
 223 }
 224
 225 static inline int xhci_dbc_resume(struct xhci_hcd *xhci)
 226 {
 227         return 0;
 228 }
 229 #endif /* CONFIG_USB_XHCI_DBGCAP */
 230 #endif /* __LINUX_XHCI_DBGCAP_H */