147 lines
3.1 KiB
C
147 lines
3.1 KiB
C
/*
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* Copyright 2022 NXP
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/*
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* MMC disk driver using zephyr SD subsystem
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*/
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#define DT_DRV_COMPAT zephyr_mmc_disk
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#include <zephyr/sd/mmc.h>
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#include <zephyr/drivers/disk.h>
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enum sd_status {
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SD_UNINIT,
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SD_ERROR,
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SD_OK,
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};
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struct mmc_config {
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const struct device *host_controller;
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uint8_t bus_width;
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};
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struct mmc_data {
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struct sd_card card;
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enum sd_status status;
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char *name;
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};
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static int disk_mmc_access_init(struct disk_info *disk)
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{
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const struct device *dev = disk->dev;
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const struct mmc_config *cfg = dev->config;
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struct mmc_data *data = dev->data;
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int ret;
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ret = sd_init(cfg->host_controller, &data->card);
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if (ret) {
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data->status = SD_ERROR;
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return ret;
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}
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data->status = SD_OK;
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return 0;
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}
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static int disk_mmc_access_status(struct disk_info *disk)
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{
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const struct device *dev = disk->dev;
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struct mmc_data *data = dev->data;
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if (data->status == SD_OK) {
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return DISK_STATUS_OK;
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} else {
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return DISK_STATUS_UNINIT;
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}
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}
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static int disk_mmc_access_read(struct disk_info *disk, uint8_t *buf,
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uint32_t sector, uint32_t count)
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{
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const struct device *dev = disk->dev;
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struct mmc_data *data = dev->data;
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return mmc_read_blocks(&data->card, buf, sector, count);
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}
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static int disk_mmc_access_write(struct disk_info *disk, const uint8_t *buf,
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uint32_t sector, uint32_t count)
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{
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const struct device *dev = disk->dev;
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struct mmc_data *data = dev->data;
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return mmc_write_blocks(&data->card, buf, sector, count);
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}
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static int disk_mmc_access_ioctl(struct disk_info *disk, uint8_t cmd, void *buf)
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{
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const struct device *dev = disk->dev;
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struct mmc_data *data = dev->data;
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switch (cmd) {
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case DISK_IOCTL_CTRL_INIT:
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return disk_mmc_access_init(disk);
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case DISK_IOCTL_CTRL_DEINIT:
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mmc_ioctl(&data->card, DISK_IOCTL_CTRL_SYNC, NULL);
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/* sd_init() will toggle power to MMC, so we can just mark
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* disk as uninitialized
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*/
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data->status = SD_UNINIT;
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return 0;
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default:
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return mmc_ioctl(&data->card, cmd, buf);
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}
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return 0;
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}
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static const struct disk_operations mmc_disk_ops = {
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.init = disk_mmc_access_init,
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.status = disk_mmc_access_status,
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.read = disk_mmc_access_read,
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.write = disk_mmc_access_write,
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.ioctl = disk_mmc_access_ioctl,
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};
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static struct disk_info mmc_disk = {
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.ops = &mmc_disk_ops,
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};
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static int disk_mmc_init(const struct device *dev)
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{
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struct mmc_data *data = dev->data;
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const struct mmc_config *config = dev->config;
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data->status = SD_UNINIT;
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data->card.bus_width = config->bus_width;
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mmc_disk.dev = dev;
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mmc_disk.name = data->name;
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return disk_access_register(&mmc_disk);
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}
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#define DISK_ACCESS_MMC_INIT(n) \
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static const struct mmc_config mmc_config_##n = { \
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.host_controller = DEVICE_DT_GET(DT_INST_PARENT(n)), \
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.bus_width = DT_INST_PROP(n, bus_width), \
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}; \
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\
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static struct mmc_data mmc_data_##n = { \
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.name = CONFIG_MMC_VOLUME_NAME, \
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}; \
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\
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DEVICE_DT_INST_DEFINE(n, \
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&disk_mmc_init, \
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NULL, \
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&mmc_data_##n, \
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&mmc_config_##n, \
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POST_KERNEL, \
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CONFIG_SD_INIT_PRIORITY, \
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NULL);
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DT_INST_FOREACH_STATUS_OKAY(DISK_ACCESS_MMC_INIT)
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