1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2015 - 2025 Beijing WangXun Technology Co., Ltd. */
9  *  wx_obtain_mbx_lock_pf - obtain mailbox lock
13  *  Return: return 0 on success and -EBUSY on failure
18 	u32 mailbox;  in wx_obtain_mbx_lock_pf()  local
20 	while (count--) {  in wx_obtain_mbx_lock_pf()
24 		/* reserve mailbox for vf use */  in wx_obtain_mbx_lock_pf()
25 		mailbox = rd32(wx, WX_PXMAILBOX(vf));  in wx_obtain_mbx_lock_pf()
26 		if (mailbox & WX_PXMAILBOX_PFU)  in wx_obtain_mbx_lock_pf()
31 	wx_err(wx, "Failed to obtain mailbox lock for PF%d", vf);  in wx_obtain_mbx_lock_pf()
33 	return -EBUSY;  in wx_obtain_mbx_lock_pf()
41 		return -EBUSY;  in wx_check_for_bit_pf()
48  *  wx_check_for_ack_pf - checks to see if the VF has acked
52  *  Return: return 0 if the VF has set the status bit or else -EBUSY
65  *  wx_check_for_msg_pf - checks to see if the VF has sent mail
69  *  Return: return 0 if the VF has got req bit or else -EBUSY
82  *  wx_write_mbx_pf - Places a message in the mailbox
88  *  Return: return 0 on success and -EINVAL/-EBUSY on failure
92 	struct wx_mbx_info *mbx = &wx->mbx;  in wx_write_mbx_pf()
95 	/* mbx->size is up to 15 */  in wx_write_mbx_pf()
96 	if (size > mbx->size) {  in wx_write_mbx_pf()
97 		wx_err(wx, "Invalid mailbox message size %d", size);  in wx_write_mbx_pf()
98 		return -EINVAL;  in wx_write_mbx_pf()
101 	/* lock the mailbox to prevent pf/vf race condition */  in wx_write_mbx_pf()
110 	/* copy the caller specified message to the mailbox memory buffer */  in wx_write_mbx_pf()
115 	/* set mirrored mailbox flags */  in wx_write_mbx_pf()
123  *  wx_read_mbx_pf - Read a message from the mailbox
129  *  Return: return 0 on success and -EBUSY on failure
133 	struct wx_mbx_info *mbx = &wx->mbx;  in wx_read_mbx_pf()
137 	/* limit read to size of mailbox and mbx->size is up to 15 */  in wx_read_mbx_pf()
138 	if (size > mbx->size)  in wx_read_mbx_pf()
139 		size = mbx->size;  in wx_read_mbx_pf()
141 	/* lock the mailbox to prevent pf/vf race condition */  in wx_read_mbx_pf()
150 	/* set mirrored mailbox flags */  in wx_read_mbx_pf()
158  *  wx_check_for_rst_pf - checks to see if the VF has reset
162  *  Return: return 0 on success and -EBUSY on failure
172 		return -EBUSY;  in wx_check_for_rst_pf()
180 	u32 mailbox = rd32(wx, WX_VXMAILBOX);  in wx_read_v2p_mailbox()  local
182 	mailbox |= wx->mbx.mailbox;  in wx_read_v2p_mailbox()
183 	wx->mbx.mailbox |= mailbox & WX_VXMAILBOX_R2C_BITS;  in wx_read_v2p_mailbox()
185 	return mailbox;  in wx_read_v2p_mailbox()
195  *  wx_obtain_mbx_lock_vf - obtain mailbox lock
198  *  Return: return 0 on success and -EBUSY on failure
203 	u32 mailbox;  in wx_obtain_mbx_lock_vf()  local
205 	ret = readx_poll_timeout_atomic(wx_mailbox_get_lock_vf, wx, mailbox,  in wx_obtain_mbx_lock_vf()
206 					(mailbox & WX_VXMAILBOX_VFU),  in wx_obtain_mbx_lock_vf()
209 		wx_err(wx, "Failed to obtain mailbox lock for VF.\n");  in wx_obtain_mbx_lock_vf()
216 	u32 mailbox = wx_read_v2p_mailbox(wx);  in wx_check_for_bit_vf()  local
218 	wx->mbx.mailbox &= ~mask;  in wx_check_for_bit_vf()
220 	return (mailbox & mask ? 0 : -EBUSY);  in wx_check_for_bit_vf()
224  *  wx_check_for_ack_vf - checks to see if the PF has ACK'd
227  *  Return: return 0 if the PF has set the status bit or else -EBUSY
236  *  wx_check_for_msg_vf - checks to see if the PF has sent mail
239  *  Return: return 0 if the PF has got req bit or else -EBUSY
248  *  wx_check_for_rst_vf - checks to see if the PF has reset
251  *  Return: return 0 if the PF has set the reset done and -EBUSY on failure
262  *  wx_poll_for_msg - Wait for message notification
269 	struct wx_mbx_info *mbx = &wx->mbx;  in wx_poll_for_msg()
273 					 (val == 0), mbx->udelay, mbx->timeout);  in wx_poll_for_msg()
277  *  wx_poll_for_ack - Wait for message acknowledgment
284 	struct wx_mbx_info *mbx = &wx->mbx;  in wx_poll_for_ack()
288 					 (val == 0), mbx->udelay, mbx->timeout);  in wx_poll_for_ack()
292  *  wx_read_posted_mbx - Wait for message notification and receive message
313  *  wx_write_posted_mbx - Write a message to the mailbox, wait for ack
335  *  wx_write_mbx_vf - Write a message to the mailbox
344 	struct wx_mbx_info *mbx = &wx->mbx;  in wx_write_mbx_vf()
347 	/* mbx->size is up to 15 */  in wx_write_mbx_vf()
348 	if (size > mbx->size) {  in wx_write_mbx_vf()
349 		wx_err(wx, "Invalid mailbox message size %d", size);  in wx_write_mbx_vf()
350 		return -EINVAL;  in wx_write_mbx_vf()
353 	/* lock the mailbox to prevent pf/vf race condition */  in wx_write_mbx_vf()
362 	/* copy the caller specified message to the mailbox memory buffer */  in wx_write_mbx_vf()
373  *  wx_read_mbx_vf - Reads a message from the inbox intended for vf
382 	struct wx_mbx_info *mbx = &wx->mbx;  in wx_read_mbx_vf()
385 	/* limit read to size of mailbox and mbx->size is up to 15 */  in wx_read_mbx_vf()
386 	if (size > mbx->size)  in wx_read_mbx_vf()
387 		size = mbx->size;  in wx_read_mbx_vf()
389 	/* lock the mailbox to prevent pf/vf race condition */  in wx_read_mbx_vf()
394 	/* copy the message from the mailbox memory buffer */  in wx_read_mbx_vf()
398 	/* Acknowledge receipt and release mailbox, then we're done */  in wx_read_mbx_vf()
406 	wx->vfinfo = kzalloc(sizeof(struct vf_data_storage),  in wx_init_mbx_params_vf()
408 	if (!wx->vfinfo)  in wx_init_mbx_params_vf()
409 		return -ENOMEM;  in wx_init_mbx_params_vf()
411 	/* Initialize mailbox parameters */  in wx_init_mbx_params_vf()
412 	wx->mbx.size = WX_VXMAILBOX_SIZE;  in wx_init_mbx_params_vf()
413 	wx->mbx.mailbox = WX_VXMAILBOX;  in wx_init_mbx_params_vf()
414 	wx->mbx.udelay = 10;  in wx_init_mbx_params_vf()
415 	wx->mbx.timeout = 1000;  in wx_init_mbx_params_vf()