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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _SPARC64_LDC_H
#define _SPARC64_LDC_H
#include <asm/hypervisor.h>
extern int ldom_domaining_enabled;
void ldom_set_var(const char *var, const char *value);
void ldom_reboot(const char *boot_command);
void ldom_power_off(void);
/* The event handler will be evoked when link state changes
* or data becomes available on the receive side.
*
* For non-RAW links, if the LDC_EVENT_RESET event arrives the
* driver should reset all of its internal state and reinvoke
* ldc_connect() to try and bring the link up again.
*
* For RAW links, ldc_connect() is not used. Instead the driver
* just waits for the LDC_EVENT_UP event.
*/
struct ldc_channel_config {
void (*event)(void *arg, int event);
u32 mtu;
unsigned int rx_irq;
unsigned int tx_irq;
u8 mode;
#define LDC_MODE_RAW 0x00
#define LDC_MODE_UNRELIABLE 0x01
#define LDC_MODE_RESERVED 0x02
#define LDC_MODE_STREAM 0x03
u8 debug;
#define LDC_DEBUG_HS 0x01
#define LDC_DEBUG_STATE 0x02
#define LDC_DEBUG_RX 0x04
#define LDC_DEBUG_TX 0x08
#define LDC_DEBUG_DATA 0x10
};
#define LDC_EVENT_RESET 0x01
#define LDC_EVENT_UP 0x02
#define LDC_EVENT_DATA_READY 0x04
#define LDC_STATE_INVALID 0x00
#define LDC_STATE_INIT 0x01
#define LDC_STATE_BOUND 0x02
#define LDC_STATE_READY 0x03
#define LDC_STATE_CONNECTED 0x04
#define LDC_PACKET_SIZE 64
struct ldc_channel;
/* Allocate state for a channel. */
struct ldc_channel *ldc_alloc(unsigned long id,
const struct ldc_channel_config *cfgp,
void *event_arg,
const char *name);
/* Shut down and free state for a channel. */
void ldc_free(struct ldc_channel *lp);
/* Register TX and RX queues of the link with the hypervisor. */
int ldc_bind(struct ldc_channel *lp);
void ldc_unbind(struct ldc_channel *lp);
/* For non-RAW protocols we need to complete a handshake before
* communication can proceed. ldc_connect() does that, if the
* handshake completes successfully, an LDC_EVENT_UP event will
* be sent up to the driver.
*/
int ldc_connect(struct ldc_channel *lp);
int ldc_disconnect(struct ldc_channel *lp);
int ldc_state(struct ldc_channel *lp);
void ldc_set_state(struct ldc_channel *lp, u8 state);
int ldc_mode(struct ldc_channel *lp);
void __ldc_print(struct ldc_channel *lp, const char *caller);
int ldc_rx_reset(struct ldc_channel *lp);
#define ldc_print(chan) __ldc_print(chan, __func__)
/* Read and write operations. Only valid when the link is up. */
int ldc_write(struct ldc_channel *lp, const void *buf,
unsigned int size);
int ldc_read(struct ldc_channel *lp, void *buf, unsigned int size);
#define LDC_MAP_SHADOW 0x01
#define LDC_MAP_DIRECT 0x02
#define LDC_MAP_IO 0x04
#define LDC_MAP_R 0x08
#define LDC_MAP_W 0x10
#define LDC_MAP_X 0x20
#define LDC_MAP_RW (LDC_MAP_R | LDC_MAP_W)
#define LDC_MAP_RWX (LDC_MAP_R | LDC_MAP_W | LDC_MAP_X)
#define LDC_MAP_ALL 0x03f
struct ldc_trans_cookie {
u64 cookie_addr;
u64 cookie_size;
};
struct scatterlist;
int ldc_map_sg(struct ldc_channel *lp,
struct scatterlist *sg, int num_sg,
struct ldc_trans_cookie *cookies, int ncookies,
unsigned int map_perm);
int ldc_map_single(struct ldc_channel *lp,
void *buf, unsigned int len,
struct ldc_trans_cookie *cookies, int ncookies,
unsigned int map_perm);
void ldc_unmap(struct ldc_channel *lp, struct ldc_trans_cookie *cookies,
int ncookies);
int ldc_copy(struct ldc_channel *lp, int copy_dir,
void *buf, unsigned int len, unsigned long offset,
struct ldc_trans_cookie *cookies, int ncookies);
static inline int ldc_get_dring_entry(struct ldc_channel *lp,
void *buf, unsigned int len,
unsigned long offset,
struct ldc_trans_cookie *cookies,
int ncookies)
{
return ldc_copy(lp, LDC_COPY_IN, buf, len, offset, cookies, ncookies);
}
static inline int ldc_put_dring_entry(struct ldc_channel *lp,
void *buf, unsigned int len,
unsigned long offset,
struct ldc_trans_cookie *cookies,
int ncookies)
{
return ldc_copy(lp, LDC_COPY_OUT, buf, len, offset, cookies, ncookies);
}
void *ldc_alloc_exp_dring(struct ldc_channel *lp, unsigned int len,
struct ldc_trans_cookie *cookies,
int *ncookies, unsigned int map_perm);
void ldc_free_exp_dring(struct ldc_channel *lp, void *buf,
unsigned int len,
struct ldc_trans_cookie *cookies, int ncookies);
#endif /* _SPARC64_LDC_H */
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