LXR linux/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
  26struct hvsi_header {
  27        uint8_t  type;
  28        uint8_t  len;
  29        __be16 seqno;
  30} __attribute__((packed));
  31
  32struct hvsi_data {
  33        struct hvsi_header hdr;
  34        uint8_t  data[HVSI_MAX_OUTGOING_DATA];
  35} __attribute__((packed));
  36
  37struct 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
  45struct hvsi_query {
  46        struct hvsi_header hdr;
  47        __be16 verb;
  48} __attribute__((packed));
  49
  50struct 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
  62struct tty_struct;
  63struct 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 */
  81struct hvc_struct;
  82extern 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);
  87extern int hvsilib_open(struct hvsi_priv *pv, struct hvc_struct *hp);
  88extern void hvsilib_close(struct hvsi_priv *pv, struct hvc_struct *hp);
  89extern int hvsilib_read_mctrl(struct hvsi_priv *pv);
  90extern int hvsilib_write_mctrl(struct hvsi_priv *pv, int dtr);
  91extern void hvsilib_establish(struct hvsi_priv *pv);
  92extern int hvsilib_get_chars(struct hvsi_priv *pv, char *buf, int count);
  93extern int hvsilib_put_chars(struct hvsi_priv *pv, const char *buf, int count);
  94
  95#endif /* _HVSI_H */
  96