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