1/*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2022-2023 Bjoern A. Zeeb 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28#ifndef _LINUXKPI_LINUX_MHI_H 29#define _LINUXKPI_LINUX_MHI_H 30 31#include <linux/types.h> 32 33/* Modem Host Interface (MHI) */ 34 35/* XXX FIXME */ 36#define MHI_DB_BRST_DISABLE 0 37#define MHI_ER_CTRL 0 38 39enum mhi_callback { 40 MHI_CB_SYS_ERROR, 41 MHI_CB_BW_REQ, 42 MHI_CB_EE_MISSION_MODE, 43 MHI_CB_EE_RDDM, 44 MHI_CB_FATAL_ERROR, 45 MHI_CB_IDLE, 46 MHI_CB_LPM_ENTER, 47 MHI_CB_LPM_EXIT, 48 MHI_CB_PENDING_DATA, 49}; 50 51struct mhi_channel_config { 52 const char *name; 53 int auto_queue, dir, doorbell, doorbell_mode_switch, ee_mask, event_ring, lpm_notify, num, num_elements, offload_channel, pollcfg; 54}; 55 56struct mhi_event_config { 57 int client_managed, data_type, hardware_event, irq, irq_moderation_ms, mode, num_elements, offload_channel, priority; 58}; 59 60struct mhi_device { 61}; 62 63struct mhi_controller_config { 64 const struct mhi_channel_config *ch_cfg; 65 struct mhi_event_config *event_cfg; 66 67 int buf_len, max_channels, num_channels, num_events, use_bounce_buf; 68 69 uint32_t timeout_ms; 70}; 71 72struct mhi_controller { 73 struct device *cntrl_dev; 74 struct mhi_device *mhi_dev; 75 void *regs; 76 int *irq; 77 const char *fw_image; 78 79 bool fbc_download; 80 size_t rddm_size; 81 size_t sbl_size; 82 size_t seg_len; 83 size_t reg_len; 84 int nr_irqs; 85 unsigned long irq_flags; 86 uint32_t timeout_ms; 87 88 dma_addr_t iova_start; 89 dma_addr_t iova_stop; 90 91 int (*runtime_get)(struct mhi_controller *); 92 void (*runtime_put)(struct mhi_controller *); 93 void (*status_cb)(struct mhi_controller *, enum mhi_callback); 94 int (*read_reg)(struct mhi_controller *, void __iomem *, uint32_t *); 95 void (*write_reg)(struct mhi_controller *, void __iomem *, uint32_t); 96}; 97 98/* -------------------------------------------------------------------------- */ 99 100struct mhi_controller *linuxkpi_mhi_alloc_controller(void); 101void linuxkpi_mhi_free_controller(struct mhi_controller *); 102int linuxkpi_mhi_register_controller(struct mhi_controller *, 103 const struct mhi_controller_config *); 104void linuxkpi_mhi_unregister_controller(struct mhi_controller *); 105 106/* -------------------------------------------------------------------------- */ 107 108static inline struct mhi_controller * 109mhi_alloc_controller(void) 110{ 111 112 /* Keep allocations internal to our implementation. */ 113 return (linuxkpi_mhi_alloc_controller()); 114} 115 116static inline void 117mhi_free_controller(struct mhi_controller *mhi_ctrl) 118{ 119 120 linuxkpi_mhi_free_controller(mhi_ctrl); 121} 122 123static inline int 124mhi_register_controller(struct mhi_controller *mhi_ctrl, 125 const struct mhi_controller_config *cfg) 126{ 127 128 return (linuxkpi_mhi_register_controller(mhi_ctrl, cfg)); 129} 130 131static inline void 132mhi_unregister_controller(struct mhi_controller *mhi_ctrl) 133{ 134 135 linuxkpi_mhi_unregister_controller(mhi_ctrl); 136} 137 138/* -------------------------------------------------------------------------- */ 139 140static __inline int 141mhi_device_get_sync(struct mhi_device *mhi_dev) 142{ 143 /* XXX TODO */ 144 return (-1); 145} 146 147static __inline void 148mhi_device_put(struct mhi_device *mhi_dev) 149{ 150 /* XXX TODO */ 151} 152 153/* -------------------------------------------------------------------------- */ 154 155static __inline int 156mhi_prepare_for_power_up(struct mhi_controller *mhi_ctrl) 157{ 158 /* XXX TODO */ 159 return (0); 160} 161 162static __inline int 163mhi_sync_power_up(struct mhi_controller *mhi_ctrl) 164{ 165 /* XXX TODO */ 166 return (0); 167} 168 169static __inline int 170mhi_async_power_up(struct mhi_controller *mhi_ctrl) 171{ 172 /* XXX TODO */ 173 return (0); 174} 175 176static __inline void 177mhi_power_down(struct mhi_controller *mhi_ctrl, bool x) 178{ 179 /* XXX TODO */ 180} 181 182static __inline void 183mhi_unprepare_after_power_down(struct mhi_controller *mhi_ctrl) 184{ 185 /* XXX TODO */ 186} 187 188/* -------------------------------------------------------------------------- */ 189 190static __inline int 191mhi_pm_suspend(struct mhi_controller *mhi_ctrl) 192{ 193 /* XXX TODO */ 194 return (0); 195} 196 197static __inline int 198mhi_pm_resume(struct mhi_controller *mhi_ctrl) 199{ 200 /* XXX TODO */ 201 return (0); 202} 203 204static __inline int 205mhi_pm_resume_force(struct mhi_controller *mhi_ctrl) 206{ 207 /* XXX TODO */ 208 return (0); 209} 210 211/* -------------------------------------------------------------------------- */ 212 213static __inline int 214mhi_force_rddm_mode(struct mhi_controller *mhi_ctrl) 215{ 216 /* XXX TODO */ 217 return (0); 218} 219 220#endif /* _LINUXKPI_LINUX_MHI_H */ 221