96 lines
2.8 KiB
C
96 lines
2.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0
|
|
*
|
|
* Copyright (C) 2019 Texas Instruments Incorporated - https://www.ti.com/
|
|
*/
|
|
|
|
#ifndef __LINUX_MTD_HYPERBUS_H__
|
|
#define __LINUX_MTD_HYPERBUS_H__
|
|
|
|
#include <linux/mtd/map.h>
|
|
|
|
/* HyperBus command bits */
|
|
#define HYPERBUS_RW 0x80 /* R/W# */
|
|
#define HYPERBUS_RW_WRITE 0
|
|
#define HYPERBUS_RW_READ 0x80
|
|
#define HYPERBUS_AS 0x40 /* Address Space */
|
|
#define HYPERBUS_AS_MEM 0
|
|
#define HYPERBUS_AS_REG 0x40
|
|
#define HYPERBUS_BT 0x20 /* Burst Type */
|
|
#define HYPERBUS_BT_WRAPPED 0
|
|
#define HYPERBUS_BT_LINEAR 0x20
|
|
|
|
enum hyperbus_memtype {
|
|
HYPERFLASH,
|
|
HYPERRAM,
|
|
};
|
|
|
|
/**
|
|
* struct hyperbus_device - struct representing HyperBus slave device
|
|
* @map: map_info struct for accessing MMIO HyperBus flash memory
|
|
* @np: pointer to HyperBus slave device node
|
|
* @mtd: pointer to MTD struct
|
|
* @ctlr: pointer to HyperBus controller struct
|
|
* @memtype: type of memory device: HyperFlash or HyperRAM
|
|
* @priv: pointer to controller specific per device private data
|
|
*/
|
|
|
|
struct hyperbus_device {
|
|
struct map_info map;
|
|
struct device_node *np;
|
|
struct mtd_info *mtd;
|
|
struct hyperbus_ctlr *ctlr;
|
|
enum hyperbus_memtype memtype;
|
|
void *priv;
|
|
};
|
|
|
|
/**
|
|
* struct hyperbus_ops - struct representing custom HyperBus operations
|
|
* @read16: read 16 bit of data from flash in a single burst. Used to read
|
|
* from non default address space, such as ID/CFI space
|
|
* @write16: write 16 bit of data to flash in a single burst. Used to
|
|
* send cmd to flash or write single 16 bit word at a time.
|
|
* @copy_from: copy data from flash memory
|
|
* @copy_to: copy data to flash memory
|
|
* @calibrate: calibrate HyperBus controller
|
|
*/
|
|
|
|
struct hyperbus_ops {
|
|
u16 (*read16)(struct hyperbus_device *hbdev, unsigned long addr);
|
|
void (*write16)(struct hyperbus_device *hbdev,
|
|
unsigned long addr, u16 val);
|
|
void (*copy_from)(struct hyperbus_device *hbdev, void *to,
|
|
unsigned long from, ssize_t len);
|
|
void (*copy_to)(struct hyperbus_device *dev, unsigned long to,
|
|
const void *from, ssize_t len);
|
|
int (*calibrate)(struct hyperbus_device *dev);
|
|
};
|
|
|
|
/**
|
|
* struct hyperbus_ctlr - struct representing HyperBus controller
|
|
* @dev: pointer to HyperBus controller device
|
|
* @calibrated: flag to indicate ctlr calibration sequence is complete
|
|
* @ops: HyperBus controller ops
|
|
*/
|
|
struct hyperbus_ctlr {
|
|
struct device *dev;
|
|
bool calibrated;
|
|
|
|
const struct hyperbus_ops *ops;
|
|
};
|
|
|
|
/**
|
|
* hyperbus_register_device - probe and register a HyperBus slave memory device
|
|
* @hbdev: hyperbus_device struct with dev, np and ctlr field populated
|
|
*
|
|
* Return: 0 for success, others for failure.
|
|
*/
|
|
int hyperbus_register_device(struct hyperbus_device *hbdev);
|
|
|
|
/**
|
|
* hyperbus_unregister_device - deregister HyperBus slave memory device
|
|
* @hbdev: hyperbus_device to be unregistered
|
|
*/
|
|
void hyperbus_unregister_device(struct hyperbus_device *hbdev);
|
|
|
|
#endif /* __LINUX_MTD_HYPERBUS_H__ */
|