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