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144 lines
3.4 KiB
144 lines
3.4 KiB
// SPDX-License-Identifier: GPL-2.0 |
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// |
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// Copyright (C) 2019 Texas Instruments Incorporated - https://www.ti.com/ |
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// Author: Vignesh Raghavendra <[email protected]> |
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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 <[email protected]>");
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