diff options
Diffstat (limited to 'drivers/mtd/hyperbus/hyperbus-core.c')
-rw-r--r-- | drivers/mtd/hyperbus/hyperbus-core.c | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/drivers/mtd/hyperbus/hyperbus-core.c b/drivers/mtd/hyperbus/hyperbus-core.c new file mode 100644 index 0000000000..4d8047d43e --- /dev/null +++ b/drivers/mtd/hyperbus/hyperbus-core.c @@ -0,0 +1,140 @@ +// 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>"); |