u-boot/drivers/block/blk-uclass.c

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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2016 Google, Inc
* Written by Simon Glass <sjg@chromium.org>
*/
#include <common.h>
#include <blk.h>
#include <dm.h>
#include <log.h>
#include <malloc.h>
#include <part.h>
#include <dm/device-internal.h>
#include <dm/lists.h>
#include <dm/uclass-internal.h>
#include <linux/err.h>
static const char *if_typename_str[IF_TYPE_COUNT] = {
[IF_TYPE_IDE] = "ide",
[IF_TYPE_SCSI] = "scsi",
[IF_TYPE_ATAPI] = "atapi",
[IF_TYPE_USB] = "usb",
[IF_TYPE_DOC] = "doc",
[IF_TYPE_MMC] = "mmc",
[IF_TYPE_SD] = "sd",
[IF_TYPE_SATA] = "sata",
[IF_TYPE_HOST] = "host",
[IF_TYPE_NVME] = "nvme",
[IF_TYPE_EFI] = "efi",
[IF_TYPE_VIRTIO] = "virtio",
};
static enum uclass_id if_type_uclass_id[IF_TYPE_COUNT] = {
[IF_TYPE_IDE] = UCLASS_IDE,
[IF_TYPE_SCSI] = UCLASS_SCSI,
[IF_TYPE_ATAPI] = UCLASS_INVALID,
[IF_TYPE_USB] = UCLASS_MASS_STORAGE,
[IF_TYPE_DOC] = UCLASS_INVALID,
[IF_TYPE_MMC] = UCLASS_MMC,
[IF_TYPE_SD] = UCLASS_INVALID,
[IF_TYPE_SATA] = UCLASS_AHCI,
[IF_TYPE_HOST] = UCLASS_ROOT,
[IF_TYPE_NVME] = UCLASS_NVME,
[IF_TYPE_EFI] = UCLASS_EFI,
[IF_TYPE_VIRTIO] = UCLASS_VIRTIO,
};
static enum if_type if_typename_to_iftype(const char *if_typename)
{
int i;
for (i = 0; i < IF_TYPE_COUNT; i++) {
if (if_typename_str[i] &&
!strcmp(if_typename, if_typename_str[i]))
return i;
}
return IF_TYPE_UNKNOWN;
}
static enum uclass_id if_type_to_uclass_id(enum if_type if_type)
{
return if_type_uclass_id[if_type];
}
const char *blk_get_if_type_name(enum if_type if_type)
{
return if_typename_str[if_type];
}
struct blk_desc *blk_get_devnum_by_type(enum if_type if_type, int devnum)
{
struct blk_desc *desc;
struct udevice *dev;
int ret;
ret = blk_get_device(if_type, devnum, &dev);
if (ret)
return NULL;
desc = dev_get_uclass_platdata(dev);
return desc;
}
/*
* This function is complicated with driver model. We look up the interface
* name in a local table. This gives us an interface type which we can match
* against the uclass of the block device's parent.
*/
struct blk_desc *blk_get_devnum_by_typename(const char *if_typename, int devnum)
{
enum uclass_id uclass_id;
enum if_type if_type;
struct udevice *dev;
struct uclass *uc;
int ret;
if_type = if_typename_to_iftype(if_typename);
if (if_type == IF_TYPE_UNKNOWN) {
debug("%s: Unknown interface type '%s'\n", __func__,
if_typename);
return NULL;
}
uclass_id = if_type_to_uclass_id(if_type);
if (uclass_id == UCLASS_INVALID) {
debug("%s: Unknown uclass for interface type'\n",
if_typename_str[if_type]);
return NULL;
}
ret = uclass_get(UCLASS_BLK, &uc);
if (ret)
return NULL;
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->devnum != devnum)
continue;
/* Find out the parent device uclass */
if (device_get_uclass_id(dev->parent) != uclass_id) {
debug("%s: parent uclass %d, this dev %d\n", __func__,
device_get_uclass_id(dev->parent), uclass_id);
continue;
}
if (device_probe(dev))
return NULL;
debug("%s: Device desc %p\n", __func__, desc);
return desc;
}
debug("%s: No device found\n", __func__);
return NULL;
}
/**
* blk_get_by_device() - Get the block device descriptor for the given device
* @dev: Instance of a storage device
*
* Return: With block device descriptor on success , NULL if there is no such
* block device.
*/
struct blk_desc *blk_get_by_device(struct udevice *dev)
{
struct udevice *child_dev;
device_foreach_child(child_dev, dev) {
if (device_get_uclass_id(child_dev) != UCLASS_BLK)
continue;
return dev_get_uclass_platdata(child_dev);
}
debug("%s: No block device found\n", __func__);
return NULL;
}
/**
* get_desc() - Get the block device descriptor for the given device number
*
* @if_type: Interface type
* @devnum: Device number (0 = first)
* @descp: Returns block device descriptor on success
* @return 0 on success, -ENODEV if there is no such device and no device
* with a higher device number, -ENOENT if there is no such device but there
* is one with a higher number, or other -ve on other error.
*/
static int get_desc(enum if_type if_type, int devnum, struct blk_desc **descp)
{
bool found_more = false;
struct udevice *dev;
struct uclass *uc;
int ret;
*descp = NULL;
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) {
if (desc->devnum == devnum) {
ret = device_probe(dev);
if (ret)
return ret;
*descp = desc;
return 0;
} else if (desc->devnum > devnum) {
found_more = true;
}
}
}
return found_more ? -ENOENT : -ENODEV;
}
int blk_select_hwpart_devnum(enum if_type if_type, int devnum, int hwpart)
{
struct udevice *dev;
int ret;
ret = blk_get_device(if_type, devnum, &dev);
if (ret)
return ret;
return blk_select_hwpart(dev, hwpart);
}
int blk_list_part(enum if_type if_type)
{
struct blk_desc *desc;
int devnum, ok;
int ret;
for (ok = 0, devnum = 0;; ++devnum) {
ret = get_desc(if_type, devnum, &desc);
if (ret == -ENODEV)
break;
else if (ret)
continue;
if (desc->part_type != PART_TYPE_UNKNOWN) {
++ok;
if (devnum)
putc('\n');
part_print(desc);
}
}
if (!ok)
return -ENODEV;
return 0;
}
int blk_print_part_devnum(enum if_type if_type, int devnum)
{
struct blk_desc *desc;
int ret;
ret = get_desc(if_type, devnum, &desc);
if (ret)
return ret;
if (desc->type == DEV_TYPE_UNKNOWN)
return -ENOENT;
part_print(desc);
return 0;
}
void blk_list_devices(enum if_type if_type)
{
struct blk_desc *desc;
int ret;
int i;
for (i = 0;; ++i) {
ret = get_desc(if_type, i, &desc);
if (ret == -ENODEV)
break;
else if (ret)
continue;
if (desc->type == DEV_TYPE_UNKNOWN)
continue; /* list only known devices */
printf("Device %d: ", i);
dev_print(desc);
}
}
int blk_print_device_num(enum if_type if_type, int devnum)
{
struct blk_desc *desc;
int ret;
ret = get_desc(if_type, devnum, &desc);
if (ret)
return ret;
printf("\nIDE device %d: ", devnum);
dev_print(desc);
return 0;
}
int blk_show_device(enum if_type if_type, int devnum)
{
struct blk_desc *desc;
int ret;
printf("\nDevice %d: ", devnum);
ret = get_desc(if_type, devnum, &desc);
if (ret == -ENODEV || ret == -ENOENT) {
printf("unknown device\n");
return -ENODEV;
}
if (ret)
return ret;
dev_print(desc);
if (desc->type == DEV_TYPE_UNKNOWN)
return -ENOENT;
return 0;
}
ulong blk_read_devnum(enum if_type if_type, int devnum, lbaint_t start,
lbaint_t blkcnt, void *buffer)
{
struct blk_desc *desc;
ulong n;
int ret;
ret = get_desc(if_type, devnum, &desc);
if (ret)
return ret;
n = blk_dread(desc, start, blkcnt, buffer);
if (IS_ERR_VALUE(n))
return n;
return n;
}
ulong blk_write_devnum(enum if_type if_type, int devnum, lbaint_t start,
lbaint_t blkcnt, const void *buffer)
{
struct blk_desc *desc;
int ret;
ret = get_desc(if_type, devnum, &desc);
if (ret)
return ret;
return blk_dwrite(desc, start, blkcnt, buffer);
}
int blk_select_hwpart(struct udevice *dev, int hwpart)
{
const struct blk_ops *ops = blk_get_ops(dev);
if (!ops)
return -ENOSYS;
if (!ops->select_hwpart)
return 0;
return ops->select_hwpart(dev, hwpart);
}
int blk_dselect_hwpart(struct blk_desc *desc, int hwpart)
{
return blk_select_hwpart(desc->bdev, hwpart);
}
int blk_first_device(int if_type, struct udevice **devp)
{
struct blk_desc *desc;
int ret;
ret = uclass_find_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_find_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_find_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_find_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 0;
}
}
return -ENODEV;
}
int blk_get_device(int if_type, int devnum, struct udevice **devp)
{
int ret;
ret = blk_find_device(if_type, devnum, devp);
if (ret)
return ret;
return device_probe(*devp);
}
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);
ulong blks_read;
if (!ops->read)
return -ENOSYS;
if (blkcache_read(block_dev->if_type, block_dev->devnum,
start, blkcnt, block_dev->blksz, buffer))
return blkcnt;
blks_read = ops->read(dev, start, blkcnt, buffer);
if (blks_read == blkcnt)
blkcache_fill(block_dev->if_type, block_dev->devnum,
start, blkcnt, block_dev->blksz, buffer);
return blks_read;
}
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;
blkcache_invalidate(block_dev->if_type, block_dev->devnum);
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;
blkcache_invalidate(block_dev->if_type, block_dev->devnum);
return ops->erase(dev, start, blkcnt);
}
int blk_get_from_parent(struct udevice *parent, struct udevice **devp)
{
struct udevice *dev;
enum uclass_id id;
int ret;
device_find_first_child(parent, &dev);
if (!dev) {
debug("%s: No block device found for parent '%s'\n", __func__,
parent->name);
return -ENODEV;
}
id = device_get_uclass_id(dev);
if (id != UCLASS_BLK) {
debug("%s: Incorrect uclass %s for block device '%s'\n",
__func__, uclass_get_name(id), dev->name);
return -ENOTBLK;
}
ret = device_probe(dev);
if (ret)
return ret;
*devp = dev;
return 0;
}
int blk_find_max_devnum(enum if_type if_type)
{
struct udevice *dev;
int max_devnum = -ENODEV;
struct uclass *uc;
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);
if (desc->if_type == if_type && desc->devnum > max_devnum)
max_devnum = desc->devnum;
}
return max_devnum;
}
int blk_next_free_devnum(enum if_type if_type)
{
int ret;
ret = blk_find_max_devnum(if_type);
if (ret == -ENODEV)
return 0;
if (ret < 0)
return ret;
return ret + 1;
}
static int blk_claim_devnum(enum if_type if_type, int devnum)
{
struct udevice *dev;
struct uclass *uc;
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);
if (desc->if_type == if_type && desc->devnum == devnum) {
int next = blk_next_free_devnum(if_type);
if (next < 0)
return next;
desc->devnum = next;
return 0;
}
}
return -ENOENT;
}
int blk_create_device(struct udevice *parent, const char *drv_name,
const char *name, int if_type, int devnum, int blksz,
lbaint_t lba, struct udevice **devp)
{
struct blk_desc *desc;
struct udevice *dev;
int ret;
if (devnum == -1) {
devnum = blk_next_free_devnum(if_type);
} else {
ret = blk_claim_devnum(if_type, devnum);
if (ret < 0 && ret != -ENOENT)
return ret;
}
if (devnum < 0)
return devnum;
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->log2blksz = LOG2(desc->blksz);
desc->lba = lba;
desc->part_type = PART_TYPE_UNKNOWN;
desc->bdev = dev;
desc->devnum = devnum;
*devp = dev;
return 0;
}
int blk_create_devicef(struct udevice *parent, const char *drv_name,
const char *name, int if_type, int devnum, int blksz,
lbaint_t lba, struct udevice **devp)
{
char dev_name[30], *str;
int ret;
snprintf(dev_name, sizeof(dev_name), "%s.%s", parent->name, name);
str = strdup(dev_name);
if (!str)
return -ENOMEM;
ret = blk_create_device(parent, drv_name, str, if_type, devnum,
blksz, lba, devp);
if (ret) {
free(str);
return ret;
}
device_set_name_alloced(*devp);
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, DM_REMOVE_NORMAL);
if (ret)
return ret;
ret = device_unbind(dev);
if (ret)
return ret;
}
}
return 0;
}
static int blk_post_probe(struct udevice *dev)
{
if (IS_ENABLED(CONFIG_PARTITIONS) &&
IS_ENABLED(CONFIG_HAVE_BLOCK_DEVICE)) {
struct blk_desc *desc = dev_get_uclass_platdata(dev);
part_init(desc);
}
return 0;
}
UCLASS_DRIVER(blk) = {
.id = UCLASS_BLK,
.name = "blk",
.post_probe = blk_post_probe,
.per_device_platdata_auto_alloc_size = sizeof(struct blk_desc),
};