u-boot/drivers/block/blk_legacy.c
Bin Meng 723b43daec blk: Remove various places that do flush cache after read
All these places seem to inherit the codes from the MMC driver where
a FIXME was put in the comment. However the correct operation after
read should be cache invalidate, not flush.

The underlying drivers should be responsible for the cache operation.
Remove these codes completely.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Stefan Roese <sr@denx.de>
Reviewed-by: York Sun <york.sun@nxp.com>
Reviewed-by: Joe Hershberger <joe.hershberger@ni.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: York Sun <york.sun@nxp.com>
2017-09-15 08:05:10 -04:00

265 lines
5.5 KiB
C

/*
* Copyright (C) 2016 Google, Inc
* Written by Simon Glass <sjg@chromium.org>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <linux/err.h>
struct blk_driver *blk_driver_lookup_type(int if_type)
{
struct blk_driver *drv = ll_entry_start(struct blk_driver, blk_driver);
const int n_ents = ll_entry_count(struct blk_driver, blk_driver);
struct blk_driver *entry;
for (entry = drv; entry != drv + n_ents; entry++) {
if (if_type == entry->if_type)
return entry;
}
/* Not found */
return NULL;
}
static struct blk_driver *blk_driver_lookup_typename(const char *if_typename)
{
struct blk_driver *drv = ll_entry_start(struct blk_driver, blk_driver);
const int n_ents = ll_entry_count(struct blk_driver, blk_driver);
struct blk_driver *entry;
for (entry = drv; entry != drv + n_ents; entry++) {
if (!strcmp(if_typename, entry->if_typename))
return entry;
}
/* Not found */
return NULL;
}
const char *blk_get_if_type_name(enum if_type if_type)
{
struct blk_driver *drv = blk_driver_lookup_type(if_type);
return drv ? drv->if_typename : NULL;
}
/**
* get_desc() - Get the block device descriptor for the given device number
*
* @drv: Legacy block driver
* @devnum: Device number (0 = first)
* @descp: Returns block device descriptor on success
* @return 0 on success, -ENODEV if there is no such device, -ENOSYS if the
* driver does not provide a way to find a device, or other -ve on other
* error.
*/
static int get_desc(struct blk_driver *drv, int devnum, struct blk_desc **descp)
{
if (drv->desc) {
if (devnum < 0 || devnum >= drv->max_devs)
return -ENODEV;
*descp = &drv->desc[devnum];
return 0;
}
if (!drv->get_dev)
return -ENOSYS;
return drv->get_dev(devnum, descp);
}
#ifdef HAVE_BLOCK_DEVICE
int blk_list_part(enum if_type if_type)
{
struct blk_driver *drv;
struct blk_desc *desc;
int devnum, ok;
bool first = true;
drv = blk_driver_lookup_type(if_type);
if (!drv)
return -ENOSYS;
for (ok = 0, devnum = 0; devnum < drv->max_devs; ++devnum) {
if (get_desc(drv, devnum, &desc))
continue;
if (desc->part_type != PART_TYPE_UNKNOWN) {
++ok;
if (!first)
putc('\n');
part_print(desc);
first = false;
}
}
if (!ok)
return -ENODEV;
return 0;
}
int blk_print_part_devnum(enum if_type if_type, int devnum)
{
struct blk_driver *drv = blk_driver_lookup_type(if_type);
struct blk_desc *desc;
int ret;
if (!drv)
return -ENOSYS;
ret = get_desc(drv, 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_driver *drv = blk_driver_lookup_type(if_type);
struct blk_desc *desc;
int i;
if (!drv)
return;
for (i = 0; i < drv->max_devs; ++i) {
if (get_desc(drv, i, &desc))
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_driver *drv = blk_driver_lookup_type(if_type);
struct blk_desc *desc;
int ret;
if (!drv)
return -ENOSYS;
ret = get_desc(drv, devnum, &desc);
if (ret)
return ret;
printf("\n%s device %d: ", drv->if_typename, devnum);
dev_print(desc);
return 0;
}
int blk_show_device(enum if_type if_type, int devnum)
{
struct blk_driver *drv = blk_driver_lookup_type(if_type);
struct blk_desc *desc;
int ret;
if (!drv)
return -ENOSYS;
printf("\nDevice %d: ", devnum);
if (devnum >= drv->max_devs) {
puts("unknown device\n");
return -ENODEV;
}
ret = get_desc(drv, devnum, &desc);
if (ret)
return ret;
dev_print(desc);
if (desc->type == DEV_TYPE_UNKNOWN)
return -ENOENT;
return 0;
}
#endif /* HAVE_BLOCK_DEVICE */
struct blk_desc *blk_get_devnum_by_type(enum if_type if_type, int devnum)
{
struct blk_driver *drv = blk_driver_lookup_type(if_type);
struct blk_desc *desc;
if (!drv)
return NULL;
if (get_desc(drv, devnum, &desc))
return NULL;
return desc;
}
int blk_dselect_hwpart(struct blk_desc *desc, int hwpart)
{
struct blk_driver *drv = blk_driver_lookup_type(desc->if_type);
if (!drv)
return -ENOSYS;
if (drv->select_hwpart)
return drv->select_hwpart(desc, hwpart);
return 0;
}
struct blk_desc *blk_get_devnum_by_typename(const char *if_typename, int devnum)
{
struct blk_driver *drv = blk_driver_lookup_typename(if_typename);
struct blk_desc *desc;
if (!drv)
return NULL;
if (get_desc(drv, devnum, &desc))
return NULL;
return desc;
}
ulong blk_read_devnum(enum if_type if_type, int devnum, lbaint_t start,
lbaint_t blkcnt, void *buffer)
{
struct blk_driver *drv = blk_driver_lookup_type(if_type);
struct blk_desc *desc;
ulong n;
int ret;
if (!drv)
return -ENOSYS;
ret = get_desc(drv, devnum, &desc);
if (ret)
return ret;
n = desc->block_read(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_driver *drv = blk_driver_lookup_type(if_type);
struct blk_desc *desc;
int ret;
if (!drv)
return -ENOSYS;
ret = get_desc(drv, devnum, &desc);
if (ret)
return ret;
return desc->block_write(desc, start, blkcnt, buffer);
}
int blk_select_hwpart_devnum(enum if_type if_type, int devnum, int hwpart)
{
struct blk_driver *drv = blk_driver_lookup_type(if_type);
struct blk_desc *desc;
int ret;
if (!drv)
return -ENOSYS;
ret = get_desc(drv, devnum, &desc);
if (ret)
return ret;
return drv->select_hwpart(desc, hwpart);
}