1 /* SPDX-License-Identifier: GPL-2.0 2 * 3 * Copyright (C) 2019 Texas Instruments Incorporated - https://www.ti.com/ 4 */ 5 6 #ifndef __LINUX_MTD_HYPERBUS_H__ 7 #define __LINUX_MTD_HYPERBUS_H__ 8 9 #include <linux/mtd/map.h> 10 11 /* HyperBus command bits */ 12 #define HYPERBUS_RW 0x80 /* R/W# */ 13 #define HYPERBUS_RW_WRITE 0 14 #define HYPERBUS_RW_READ 0x80 15 #define HYPERBUS_AS 0x40 /* Address Space */ 16 #define HYPERBUS_AS_MEM 0 17 #define HYPERBUS_AS_REG 0x40 18 #define HYPERBUS_BT 0x20 /* Burst Type */ 19 #define HYPERBUS_BT_WRAPPED 0 20 #define HYPERBUS_BT_LINEAR 0x20 21 22 enum hyperbus_memtype { 23 HYPERFLASH, 24 HYPERRAM, 25 }; 26 27 /** 28 * struct hyperbus_device - struct representing HyperBus slave device 29 * @map: map_info struct for accessing MMIO HyperBus flash memory 30 * @np: pointer to HyperBus slave device node 31 * @mtd: pointer to MTD struct 32 * @ctlr: pointer to HyperBus controller struct 33 * @memtype: type of memory device: HyperFlash or HyperRAM 34 * @priv: pointer to controller specific per device private data 35 */ 36 37 struct hyperbus_device { 38 struct map_info map; 39 struct device_node *np; 40 struct mtd_info *mtd; 41 struct hyperbus_ctlr *ctlr; 42 enum hyperbus_memtype memtype; 43 void *priv; 44 }; 45 46 /** 47 * struct hyperbus_ops - struct representing custom HyperBus operations 48 * @read16: read 16 bit of data from flash in a single burst. Used to read 49 * from non default address space, such as ID/CFI space 50 * @write16: write 16 bit of data to flash in a single burst. Used to 51 * send cmd to flash or write single 16 bit word at a time. 52 * @copy_from: copy data from flash memory 53 * @copy_to: copy data to flash memory 54 * @calibrate: calibrate HyperBus controller 55 */ 56 57 struct hyperbus_ops { 58 u16 (*read16)(struct hyperbus_device *hbdev, unsigned long addr); 59 void (*write16)(struct hyperbus_device *hbdev, 60 unsigned long addr, u16 val); 61 void (*copy_from)(struct hyperbus_device *hbdev, void *to, 62 unsigned long from, ssize_t len); 63 void (*copy_to)(struct hyperbus_device *dev, unsigned long to, 64 const void *from, ssize_t len); 65 int (*calibrate)(struct hyperbus_device *dev); 66 }; 67 68 /** 69 * struct hyperbus_ctlr - struct representing HyperBus controller 70 * @dev: pointer to HyperBus controller device 71 * @calibrated: flag to indicate ctlr calibration sequence is complete 72 * @ops: HyperBus controller ops 73 */ 74 struct hyperbus_ctlr { 75 struct device *dev; 76 bool calibrated; 77 78 const struct hyperbus_ops *ops; 79 }; 80 81 /** 82 * hyperbus_register_device - probe and register a HyperBus slave memory device 83 * @hbdev: hyperbus_device struct with dev, np and ctlr field populated 84 * 85 * Return: 0 for success, others for failure. 86 */ 87 int hyperbus_register_device(struct hyperbus_device *hbdev); 88 89 /** 90 * hyperbus_unregister_device - deregister HyperBus slave memory device 91 * @hbdev: hyperbus_device to be unregistered 92 */ 93 void hyperbus_unregister_device(struct hyperbus_device *hbdev); 94 95 #endif /* __LINUX_MTD_HYPERBUS_H__ */ 96
