arch/sparc/include/asm/ldc.h

   1 #ifndef _SPARC64_LDC_H
   2 #define _SPARC64_LDC_H
   3
   4 #include <asm/hypervisor.h>
   5
   6 extern int ldom_domaining_enabled;
   7 void ldom_set_var(const char *var, const char *value);
   8 void ldom_reboot(const char *boot_command);
   9 void ldom_power_off(void);
  10
  11 /* The event handler will be evoked when link state changes
  12  * or data becomes available on the receive side.
  13  *
  14  * For non-RAW links, if the LDC_EVENT_RESET event arrives the
  15  * driver should reset all of it's internal state and reinvoke
  16  * ldc_connect() to try and bring the link up again.
  17  *
  18  * For RAW links, ldc_connect() is not used.  Instead the driver
  19  * just waits for the LDC_EVENT_UP event.
  20  */
  21 struct ldc_channel_config {
  22         void (*event)(void *arg, int event);
  23
  24         u32                     mtu;
  25         unsigned int            rx_irq;
  26         unsigned int            tx_irq;
  27         u8                      mode;
  28 #define LDC_MODE_RAW            0x00
  29 #define LDC_MODE_UNRELIABLE     0x01
  30 #define LDC_MODE_RESERVED       0x02
  31 #define LDC_MODE_STREAM         0x03
  32
  33         u8                      debug;
  34 #define LDC_DEBUG_HS            0x01
  35 #define LDC_DEBUG_STATE         0x02
  36 #define LDC_DEBUG_RX            0x04
  37 #define LDC_DEBUG_TX            0x08
  38 #define LDC_DEBUG_DATA          0x10
  39 };
  40
  41 #define LDC_EVENT_RESET         0x01
  42 #define LDC_EVENT_UP            0x02
  43 #define LDC_EVENT_DATA_READY    0x04
  44
  45 #define LDC_STATE_INVALID       0x00
  46 #define LDC_STATE_INIT          0x01
  47 #define LDC_STATE_BOUND         0x02
  48 #define LDC_STATE_READY         0x03
  49 #define LDC_STATE_CONNECTED     0x04
  50
  51 struct ldc_channel;
  52
  53 /* Allocate state for a channel.  */
  54 struct ldc_channel *ldc_alloc(unsigned long id,
  55                               const struct ldc_channel_config *cfgp,
  56                               void *event_arg,
  57                               const char *name);
  58
  59 /* Shut down and free state for a channel.  */
  60 void ldc_free(struct ldc_channel *lp);
  61
  62 /* Register TX and RX queues of the link with the hypervisor.  */
  63 int ldc_bind(struct ldc_channel *lp);
  64 void ldc_unbind(struct ldc_channel *lp);
  65
  66 /* For non-RAW protocols we need to complete a handshake before
  67  * communication can proceed.  ldc_connect() does that, if the
  68  * handshake completes successfully, an LDC_EVENT_UP event will
  69  * be sent up to the driver.
  70  */
  71 int ldc_connect(struct ldc_channel *lp);
  72 int ldc_disconnect(struct ldc_channel *lp);
  73
  74 int ldc_state(struct ldc_channel *lp);
  75
  76 /* Read and write operations.  Only valid when the link is up.  */
  77 int ldc_write(struct ldc_channel *lp, const void *buf,
  78               unsigned int size);
  79 int ldc_read(struct ldc_channel *lp, void *buf, unsigned int size);
  80
  81 #define LDC_MAP_SHADOW  0x01
  82 #define LDC_MAP_DIRECT  0x02
  83 #define LDC_MAP_IO      0x04
  84 #define LDC_MAP_R       0x08
  85 #define LDC_MAP_W       0x10
  86 #define LDC_MAP_X       0x20
  87 #define LDC_MAP_RW      (LDC_MAP_R | LDC_MAP_W)
  88 #define LDC_MAP_RWX     (LDC_MAP_R | LDC_MAP_W | LDC_MAP_X)
  89 #define LDC_MAP_ALL     0x03f
  90
  91 struct ldc_trans_cookie {
  92         u64                     cookie_addr;
  93         u64                     cookie_size;
  94 };
  95
  96 struct scatterlist;
  97 int ldc_map_sg(struct ldc_channel *lp,
  98                struct scatterlist *sg, int num_sg,
  99                struct ldc_trans_cookie *cookies, int ncookies,
 100                unsigned int map_perm);
 101
 102 int ldc_map_single(struct ldc_channel *lp,
 103                    void *buf, unsigned int len,
 104                    struct ldc_trans_cookie *cookies, int ncookies,
 105                    unsigned int map_perm);
 106
 107 void ldc_unmap(struct ldc_channel *lp, struct ldc_trans_cookie *cookies,
 108                int ncookies);
 109
 110 int ldc_copy(struct ldc_channel *lp, int copy_dir,
 111              void *buf, unsigned int len, unsigned long offset,
 112              struct ldc_trans_cookie *cookies, int ncookies);
 113
 114 static inline int ldc_get_dring_entry(struct ldc_channel *lp,
 115                                       void *buf, unsigned int len,
 116                                       unsigned long offset,
 117                                       struct ldc_trans_cookie *cookies,
 118                                       int ncookies)
 119 {
 120         return ldc_copy(lp, LDC_COPY_IN, buf, len, offset, cookies, ncookies);
 121 }
 122
 123 static inline int ldc_put_dring_entry(struct ldc_channel *lp,
 124                                       void *buf, unsigned int len,
 125                                       unsigned long offset,
 126                                       struct ldc_trans_cookie *cookies,
 127                                       int ncookies)
 128 {
 129         return ldc_copy(lp, LDC_COPY_OUT, buf, len, offset, cookies, ncookies);
 130 }
 131
 132 void *ldc_alloc_exp_dring(struct ldc_channel *lp, unsigned int len,
 133                           struct ldc_trans_cookie *cookies,
 134                           int *ncookies, unsigned int map_perm);
 135
 136 void ldc_free_exp_dring(struct ldc_channel *lp, void *buf,
 137                         unsigned int len,
 138                         struct ldc_trans_cookie *cookies, int ncookies);
 139
 140 #endif /* _SPARC64_LDC_H */