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// SPDX-License-Identifier: GPL-2.0
//
// Copyright (C) 2019 Texas Instruments Incorporated - https://www.ti.com/
// Author: Vignesh Raghavendra <vigneshr@ti.com>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mtd/hyperbus.h>
#include <linux/mtd/map.h>
#include <linux/mtd/mtd.h>
#include <linux/of.h>
#include <linux/types.h>
static struct hyperbus_device *map_to_hbdev(struct map_info *map)
{
return container_of(map, struct hyperbus_device, map);
}
static map_word hyperbus_read16(struct map_info *map, unsigned long addr)
{
struct hyperbus_device *hbdev = map_to_hbdev(map);
struct hyperbus_ctlr *ctlr = hbdev->ctlr;
map_word read_data;
read_data.x[0] = ctlr->ops->read16(hbdev, addr);
return read_data;
}
static void hyperbus_write16(struct map_info *map, map_word d,
unsigned long addr)
{
struct hyperbus_device *hbdev = map_to_hbdev(map);
struct hyperbus_ctlr *ctlr = hbdev->ctlr;
ctlr->ops->write16(hbdev, addr, d.x[0]);
}
static void hyperbus_copy_from(struct map_info *map, void *to,
unsigned long from, ssize_t len)
{
struct hyperbus_device *hbdev = map_to_hbdev(map);
struct hyperbus_ctlr *ctlr = hbdev->ctlr;
ctlr->ops->copy_from(hbdev, to, from, len);
}
static void hyperbus_copy_to(struct map_info *map, unsigned long to,
const void *from, ssize_t len)
{
struct hyperbus_device *hbdev = map_to_hbdev(map);
struct hyperbus_ctlr *ctlr = hbdev->ctlr;
ctlr->ops->copy_to(hbdev, to, from, len);
}
int hyperbus_register_device(struct hyperbus_device *hbdev)
{
const struct hyperbus_ops *ops;
struct hyperbus_ctlr *ctlr;
struct device_node *np;
struct map_info *map;
struct device *dev;
int ret;
if (!hbdev || !hbdev->np || !hbdev->ctlr || !hbdev->ctlr->dev) {
pr_err("hyperbus: please fill all the necessary fields!\n");
return -EINVAL;
}
np = hbdev->np;
ctlr = hbdev->ctlr;
if (!of_device_is_compatible(np, "cypress,hyperflash")) {
dev_err(ctlr->dev, "\"cypress,hyperflash\" compatible missing\n");
return -ENODEV;
}
hbdev->memtype = HYPERFLASH;
dev = ctlr->dev;
map = &hbdev->map;
map->name = dev_name(dev);
map->bankwidth = 2;
map->device_node = np;
simple_map_init(map);
ops = ctlr->ops;
if (ops) {
if (ops->read16)
map->read = hyperbus_read16;
if (ops->write16)
map->write = hyperbus_write16;
if (ops->copy_to)
map->copy_to = hyperbus_copy_to;
if (ops->copy_from)
map->copy_from = hyperbus_copy_from;
if (ops->calibrate && !ctlr->calibrated) {
ret = ops->calibrate(hbdev);
if (!ret) {
dev_err(dev, "Calibration failed\n");
return -ENODEV;
}
ctlr->calibrated = true;
}
}
hbdev->mtd = do_map_probe("cfi_probe", map);
if (!hbdev->mtd) {
dev_err(dev, "probing of hyperbus device failed\n");
return -ENODEV;
}
hbdev->mtd->dev.parent = dev;
mtd_set_of_node(hbdev->mtd, np);
ret = mtd_device_register(hbdev->mtd, NULL, 0);
if (ret) {
dev_err(dev, "failed to register mtd device\n");
map_destroy(hbdev->mtd);
return ret;
}
return 0;
}
EXPORT_SYMBOL_GPL(hyperbus_register_device);
void hyperbus_unregister_device(struct hyperbus_device *hbdev)
{
if (hbdev && hbdev->mtd) {
WARN_ON(mtd_device_unregister(hbdev->mtd));
map_destroy(hbdev->mtd);
}
}
EXPORT_SYMBOL_GPL(hyperbus_unregister_device);
MODULE_DESCRIPTION("HyperBus Framework");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Vignesh Raghavendra <vigneshr@ti.com>");
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