arch/powerpc/include/asm/hvsi.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _HVSI_H
   3 #define _HVSI_H
   4
   5 #define VS_DATA_PACKET_HEADER           0xff
   6 #define VS_CONTROL_PACKET_HEADER        0xfe
   7 #define VS_QUERY_PACKET_HEADER          0xfd
   8 #define VS_QUERY_RESPONSE_PACKET_HEADER 0xfc
   9
  10 /* control verbs */
  11 #define VSV_SET_MODEM_CTL    1 /* to service processor only */
  12 #define VSV_MODEM_CTL_UPDATE 2 /* from service processor only */
  13 #define VSV_CLOSE_PROTOCOL   3
  14
  15 /* query verbs */
  16 #define VSV_SEND_VERSION_NUMBER 1
  17 #define VSV_SEND_MODEM_CTL_STATUS 2
  18
  19 /* yes, these masks are not consecutive. */
  20 #define HVSI_TSDTR 0x01
  21 #define HVSI_TSCD  0x20
  22
  23 #define HVSI_MAX_OUTGOING_DATA 12
  24 #define HVSI_VERSION 1
  25
  26 struct hvsi_header {
  27         uint8_t  type;
  28         uint8_t  len;
  29         __be16 seqno;
  30 } __attribute__((packed));
  31
  32 struct hvsi_data {
  33         struct hvsi_header hdr;
  34         uint8_t  data[HVSI_MAX_OUTGOING_DATA];
  35 } __attribute__((packed));
  36
  37 struct hvsi_control {
  38         struct hvsi_header hdr;
  39         __be16 verb;
  40         /* optional depending on verb: */
  41         __be32 word;
  42         __be32 mask;
  43 } __attribute__((packed));
  44
  45 struct hvsi_query {
  46         struct hvsi_header hdr;
  47         __be16 verb;
  48 } __attribute__((packed));
  49
  50 struct hvsi_query_response {
  51         struct hvsi_header hdr;
  52         __be16 verb;
  53         __be16 query_seqno;
  54         union {
  55                 uint8_t  version;
  56                 __be32 mctrl_word;
  57         } u;
  58 } __attribute__((packed));
  59
  60 /* hvsi lib struct definitions */
  61 #define HVSI_INBUF_SIZE         255
  62 struct tty_struct;
  63 struct hvsi_priv {
  64         unsigned int    inbuf_len;      /* data in input buffer */
  65         unsigned char   inbuf[HVSI_INBUF_SIZE];
  66         unsigned int    inbuf_cur;      /* Cursor in input buffer */
  67         unsigned int    inbuf_pktlen;   /* packet length from cursor */
  68         atomic_t        seqno;          /* packet sequence number */
  69         unsigned int    opened:1;       /* driver opened */
  70         unsigned int    established:1;  /* protocol established */
  71         unsigned int    is_console:1;   /* used as a kernel console device */
  72         unsigned int    mctrl_update:1; /* modem control updated */
  73         unsigned short  mctrl;          /* modem control */
  74         struct tty_struct *tty;         /* tty structure */
  75         int (*get_chars)(uint32_t termno, char *buf, int count);
  76         int (*put_chars)(uint32_t termno, const char *buf, int count);
  77         uint32_t        termno;
  78 };
  79
  80 /* hvsi lib functions */
  81 struct hvc_struct;
  82 extern void hvsilib_init(struct hvsi_priv *pv,
  83                          int (*get_chars)(uint32_t termno, char *buf, int count),
  84                          int (*put_chars)(uint32_t termno, const char *buf,
  85                                           int count),
  86                          int termno, int is_console);
  87 extern int hvsilib_open(struct hvsi_priv *pv, struct hvc_struct *hp);
  88 extern void hvsilib_close(struct hvsi_priv *pv, struct hvc_struct *hp);
  89 extern int hvsilib_read_mctrl(struct hvsi_priv *pv);
  90 extern int hvsilib_write_mctrl(struct hvsi_priv *pv, int dtr);
  91 extern void hvsilib_establish(struct hvsi_priv *pv);
  92 extern int hvsilib_get_chars(struct hvsi_priv *pv, char *buf, int count);
  93 extern int hvsilib_put_chars(struct hvsi_priv *pv, const char *buf, int count);
  94
  95 #endif /* _HVSI_H */