dm: blk: Add a block-device uclass
Add a uclass for block devices. These provide block-oriented data access,
supporting reading, writing and erasing of whole blocks.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Stephen Warren <swarren@nvidia.com>
diff --git a/drivers/block/blk-uclass.c b/drivers/block/blk-uclass.c
new file mode 100644
index 0000000..49df2a6
--- /dev/null
+++ b/drivers/block/blk-uclass.c
@@ -0,0 +1,175 @@
+/*
+ * Copyright (C) 2016 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <blk.h>
+#include <dm.h>
+#include <dm/device-internal.h>
+#include <dm/lists.h>
+
+int blk_first_device(int if_type, struct udevice **devp)
+{
+ struct blk_desc *desc;
+ int ret;
+
+ ret = uclass_first_device(UCLASS_BLK, devp);
+ if (ret)
+ return ret;
+ if (!*devp)
+ return -ENODEV;
+ do {
+ desc = dev_get_uclass_platdata(*devp);
+ if (desc->if_type == if_type)
+ return 0;
+ ret = uclass_next_device(devp);
+ if (ret)
+ return ret;
+ } while (*devp);
+
+ return -ENODEV;
+}
+
+int blk_next_device(struct udevice **devp)
+{
+ struct blk_desc *desc;
+ int ret, if_type;
+
+ desc = dev_get_uclass_platdata(*devp);
+ if_type = desc->if_type;
+ do {
+ ret = uclass_next_device(devp);
+ if (ret)
+ return ret;
+ if (!*devp)
+ return -ENODEV;
+ desc = dev_get_uclass_platdata(*devp);
+ if (desc->if_type == if_type)
+ return 0;
+ } while (1);
+}
+
+int blk_get_device(int if_type, int devnum, struct udevice **devp)
+{
+ struct uclass *uc;
+ struct udevice *dev;
+ int ret;
+
+ ret = uclass_get(UCLASS_BLK, &uc);
+ if (ret)
+ return ret;
+ uclass_foreach_dev(dev, uc) {
+ struct blk_desc *desc = dev_get_uclass_platdata(dev);
+
+ debug("%s: if_type=%d, devnum=%d: %s, %d, %d\n", __func__,
+ if_type, devnum, dev->name, desc->if_type, desc->devnum);
+ if (desc->if_type == if_type && desc->devnum == devnum) {
+ *devp = dev;
+ return device_probe(dev);
+ }
+ }
+
+ return -ENODEV;
+}
+
+unsigned long blk_dread(struct blk_desc *block_dev, lbaint_t start,
+ lbaint_t blkcnt, void *buffer)
+{
+ struct udevice *dev = block_dev->bdev;
+ const struct blk_ops *ops = blk_get_ops(dev);
+
+ if (!ops->read)
+ return -ENOSYS;
+
+ return ops->read(dev, start, blkcnt, buffer);
+}
+
+unsigned long blk_dwrite(struct blk_desc *block_dev, lbaint_t start,
+ lbaint_t blkcnt, const void *buffer)
+{
+ struct udevice *dev = block_dev->bdev;
+ const struct blk_ops *ops = blk_get_ops(dev);
+
+ if (!ops->write)
+ return -ENOSYS;
+
+ return ops->write(dev, start, blkcnt, buffer);
+}
+
+unsigned long blk_derase(struct blk_desc *block_dev, lbaint_t start,
+ lbaint_t blkcnt)
+{
+ struct udevice *dev = block_dev->bdev;
+ const struct blk_ops *ops = blk_get_ops(dev);
+
+ if (!ops->erase)
+ return -ENOSYS;
+
+ return ops->erase(dev, start, blkcnt);
+}
+
+int blk_prepare_device(struct udevice *dev)
+{
+ struct blk_desc *desc = dev_get_uclass_platdata(dev);
+
+ part_init(desc);
+
+ return 0;
+}
+
+int blk_create_device(struct udevice *parent, const char *drv_name,
+ const char *name, int if_type, int devnum, int blksz,
+ lbaint_t size, struct udevice **devp)
+{
+ struct blk_desc *desc;
+ struct udevice *dev;
+ int ret;
+
+ ret = device_bind_driver(parent, drv_name, name, &dev);
+ if (ret)
+ return ret;
+ desc = dev_get_uclass_platdata(dev);
+ desc->if_type = if_type;
+ desc->blksz = blksz;
+ desc->lba = size / blksz;
+ desc->part_type = PART_TYPE_UNKNOWN;
+ desc->bdev = dev;
+ desc->devnum = devnum;
+ *devp = dev;
+
+ return 0;
+}
+
+int blk_unbind_all(int if_type)
+{
+ struct uclass *uc;
+ struct udevice *dev, *next;
+ int ret;
+
+ ret = uclass_get(UCLASS_BLK, &uc);
+ if (ret)
+ return ret;
+ uclass_foreach_dev_safe(dev, next, uc) {
+ struct blk_desc *desc = dev_get_uclass_platdata(dev);
+
+ if (desc->if_type == if_type) {
+ ret = device_remove(dev);
+ if (ret)
+ return ret;
+ ret = device_unbind(dev);
+ if (ret)
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+UCLASS_DRIVER(blk) = {
+ .id = UCLASS_BLK,
+ .name = "blk",
+ .per_device_platdata_auto_alloc_size = sizeof(struct blk_desc),
+};