plat/arm/css/drivers/mhu/css_mhu_doorbell.h

   1 /*
   2  * Copyright (c) 2014-2018, ARM Limited and Contributors. All rights reserved.
   3  *
   4  * SPDX-License-Identifier: BSD-3-Clause
   5  */
   6
   7 #ifndef CSS_MHU_DOORBELL_H
   8 #define CSS_MHU_DOORBELL_H
   9
  10 #include <stdint.h>
  11
  12 #include <lib/mmio.h>
  13
  14 /* MHUv2 Base Address */
  15 #define MHUV2_BASE_ADDR         PLAT_CSS_MHU_BASE
  16
  17 /* MHUv2 Control Registers Offsets */
  18 #define MHU_V2_MSG_NO_CAP_OFFSET                0xF80
  19 #define MHU_V2_ACCESS_REQ_OFFSET                0xF88
  20 #define MHU_V2_ACCESS_READY_OFFSET              0xF8C
  21
  22 #define SENDER_REG_STAT(_channel)       (0x20 * (_channel))
  23 #define SENDER_REG_SET(_channel)        ((0x20 * (_channel)) + 0xC)
  24
  25 /* Helper macro to ring doorbell */
  26 #define MHU_RING_DOORBELL(addr, modify_mask, preserve_mask)     do {    \
  27                 uint32_t db = mmio_read_32(addr) & (preserve_mask);     \
  28                 mmio_write_32(addr, db | (modify_mask));                \
  29         } while (0)
  30
  31 #define MHU_V2_ACCESS_REQUEST(addr)     \
  32         mmio_write_32((addr) + MHU_V2_ACCESS_REQ_OFFSET, 0x1)
  33
  34 #define MHU_V2_CLEAR_REQUEST(addr)      \
  35         mmio_write_32((addr) + MHU_V2_ACCESS_REQ_OFFSET, 0x0)
  36
  37 #define MHU_V2_IS_ACCESS_READY(addr)    \
  38         (mmio_read_32((addr) + MHU_V2_ACCESS_READY_OFFSET) & 0x1)
  39
  40 struct scmi_channel_plat_info;
  41 void mhu_ring_doorbell(struct scmi_channel_plat_info *plat_info);
  42 void mhuv2_ring_doorbell(struct scmi_channel_plat_info *plat_info);
  43
  44 #endif  /* CSS_MHU_DOORBELL_H */