diff options
Diffstat (limited to 'drivers/net/ethernet/wangxun/libwx/wx_mbx.c')
| -rw-r--r-- | drivers/net/ethernet/wangxun/libwx/wx_mbx.c | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/drivers/net/ethernet/wangxun/libwx/wx_mbx.c b/drivers/net/ethernet/wangxun/libwx/wx_mbx.c new file mode 100644 index 000000000000..73af5f11c3bd --- /dev/null +++ b/drivers/net/ethernet/wangxun/libwx/wx_mbx.c @@ -0,0 +1,176 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2015 - 2025 Beijing WangXun Technology Co., Ltd. */ + +#include <linux/pci.h> +#include "wx_type.h" +#include "wx_mbx.h" + +/** + * wx_obtain_mbx_lock_pf - obtain mailbox lock + * @wx: pointer to the HW structure + * @vf: the VF index + * + * Return: return 0 on success and -EBUSY on failure + **/ +static int wx_obtain_mbx_lock_pf(struct wx *wx, u16 vf) +{ + int count = 5; + u32 mailbox; + + while (count--) { + /* Take ownership of the buffer */ + wr32(wx, WX_PXMAILBOX(vf), WX_PXMAILBOX_PFU); + + /* reserve mailbox for vf use */ + mailbox = rd32(wx, WX_PXMAILBOX(vf)); + if (mailbox & WX_PXMAILBOX_PFU) + return 0; + else if (count) + udelay(10); + } + wx_err(wx, "Failed to obtain mailbox lock for PF%d", vf); + + return -EBUSY; +} + +static int wx_check_for_bit_pf(struct wx *wx, u32 mask, int index) +{ + u32 mbvficr = rd32(wx, WX_MBVFICR(index)); + + if (!(mbvficr & mask)) + return -EBUSY; + wr32(wx, WX_MBVFICR(index), mask); + + return 0; +} + +/** + * wx_check_for_ack_pf - checks to see if the VF has acked + * @wx: pointer to the HW structure + * @vf: the VF index + * + * Return: return 0 if the VF has set the status bit or else -EBUSY + **/ +int wx_check_for_ack_pf(struct wx *wx, u16 vf) +{ + u32 index = vf / 16, vf_bit = vf % 16; + + return wx_check_for_bit_pf(wx, + FIELD_PREP(WX_MBVFICR_VFACK_MASK, + BIT(vf_bit)), + index); +} + +/** + * wx_check_for_msg_pf - checks to see if the VF has sent mail + * @wx: pointer to the HW structure + * @vf: the VF index + * + * Return: return 0 if the VF has got req bit or else -EBUSY + **/ +int wx_check_for_msg_pf(struct wx *wx, u16 vf) +{ + u32 index = vf / 16, vf_bit = vf % 16; + + return wx_check_for_bit_pf(wx, + FIELD_PREP(WX_MBVFICR_VFREQ_MASK, + BIT(vf_bit)), + index); +} + +/** + * wx_write_mbx_pf - Places a message in the mailbox + * @wx: pointer to the HW structure + * @msg: The message buffer + * @size: Length of buffer + * @vf: the VF index + * + * Return: return 0 on success and -EINVAL/-EBUSY on failure + **/ +int wx_write_mbx_pf(struct wx *wx, u32 *msg, u16 size, u16 vf) +{ + struct wx_mbx_info *mbx = &wx->mbx; + int ret, i; + + /* mbx->size is up to 15 */ + if (size > mbx->size) { + wx_err(wx, "Invalid mailbox message size %d", size); + return -EINVAL; + } + + /* lock the mailbox to prevent pf/vf race condition */ + ret = wx_obtain_mbx_lock_pf(wx, vf); + if (ret) + return ret; + + /* flush msg and acks as we are overwriting the message buffer */ + wx_check_for_msg_pf(wx, vf); + wx_check_for_ack_pf(wx, vf); + + /* copy the caller specified message to the mailbox memory buffer */ + for (i = 0; i < size; i++) + wr32a(wx, WX_PXMBMEM(vf), i, msg[i]); + + /* Interrupt VF to tell it a message has been sent and release buffer */ + /* set mirrored mailbox flags */ + wr32a(wx, WX_PXMBMEM(vf), WX_VXMAILBOX_SIZE, WX_PXMAILBOX_STS); + wr32(wx, WX_PXMAILBOX(vf), WX_PXMAILBOX_STS); + + return 0; +} + +/** + * wx_read_mbx_pf - Read a message from the mailbox + * @wx: pointer to the HW structure + * @msg: The message buffer + * @size: Length of buffer + * @vf: the VF index + * + * Return: return 0 on success and -EBUSY on failure + **/ +int wx_read_mbx_pf(struct wx *wx, u32 *msg, u16 size, u16 vf) +{ + struct wx_mbx_info *mbx = &wx->mbx; + int ret; + u16 i; + + /* limit read to size of mailbox and mbx->size is up to 15 */ + if (size > mbx->size) + size = mbx->size; + + /* lock the mailbox to prevent pf/vf race condition */ + ret = wx_obtain_mbx_lock_pf(wx, vf); + if (ret) + return ret; + + for (i = 0; i < size; i++) + msg[i] = rd32a(wx, WX_PXMBMEM(vf), i); + + /* Acknowledge the message and release buffer */ + /* set mirrored mailbox flags */ + wr32a(wx, WX_PXMBMEM(vf), WX_VXMAILBOX_SIZE, WX_PXMAILBOX_ACK); + wr32(wx, WX_PXMAILBOX(vf), WX_PXMAILBOX_ACK); + + return 0; +} + +/** + * wx_check_for_rst_pf - checks to see if the VF has reset + * @wx: pointer to the HW structure + * @vf: the VF index + * + * Return: return 0 on success and -EBUSY on failure + **/ +int wx_check_for_rst_pf(struct wx *wx, u16 vf) +{ + u32 reg_offset = WX_VF_REG_OFFSET(vf); + u32 vf_shift = WX_VF_IND_SHIFT(vf); + u32 vflre = 0; + + vflre = rd32(wx, WX_VFLRE(reg_offset)); + if (!(vflre & BIT(vf_shift))) + return -EBUSY; + wr32(wx, WX_VFLREC(reg_offset), BIT(vf_shift)); + + return 0; +} |