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#include <config.h>
#include <errno.h>
#include <fcntl.h>
#include <glib/gstdio.h>
#include <linux/major.h>
#include <linux/types.h> /* kernel < 3.4 forgot that in mmc/ioctl.h */
#include <linux/mmc/ioctl.h>
#include <string.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include "emmc.h"
#include "update_handler.h"
#include "utils.h"
GQuark r_emmc_error_quark(void)
{
return g_quark_from_static_string("r_emmc_error_quark");
}
static int r_emmc_read_extcsd(int fd, guint8 extcsd[512])
{
struct mmc_ioc_cmd cmd = {};
cmd.write_flag = 0;
cmd.opcode = MMC_SEND_EXT_CSD;
cmd.arg = 0;
cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
cmd.blksz = 512;
cmd.blocks = 1;
mmc_ioc_cmd_set_data(cmd, extcsd);
return ioctl(fd, MMC_IOC_CMD, &cmd);
}
gboolean r_emmc_read_bootpart(const gchar *device, gint *bootpart_active, GError **error)
{
guint8 extcsd[512];
g_auto(filedesc) fd = -1;
/* count from 1 */
gint active_partition = -1;
fd = g_open(device, O_RDONLY);
if (fd == -1) {
int err = errno;
g_set_error(error, G_FILE_ERROR, g_file_error_from_errno(err),
"opening eMMC device failed: %s", g_strerror(err));
return FALSE;
}
if (r_emmc_read_extcsd(fd, extcsd)) {
g_set_error(error, R_EMMC_ERROR, R_EMMC_ERROR_IOCTL,
"Could not read from extcsd register %d in %s",
EXT_CSD_PART_CONFIG, device);
return FALSE;
}
/* retrieve active partition from BOOT_PART register */
active_partition = (extcsd[EXT_CSD_PART_CONFIG] & 0x38) >> 3;
switch (active_partition) {
case 0x0: /* not boot enabled */
*bootpart_active = -1;
return TRUE;
case 0x1: /* boot0 / boot 1 */
/* fallthgrough */
case 0x2:
/* return the partitions counted from 0 */
*bootpart_active = active_partition - 1;
return TRUE;
case 0x7: /* user data area */
g_set_error(error,
R_EMMC_ERROR,
R_EMMC_ERROR_BOOTPART_UDA,
"Active eMMC partition is UDA when boot0/boot1 was expected.");
return FALSE;
default:
g_set_error(error,
R_EMMC_ERROR,
R_EMMC_ERROR_BOOTPART_INVALID,
"Invalid (Reserved) eMMC boot part number.");
return FALSE;
}
g_return_val_if_reached(FALSE);
}
static gint r_emmc_write_extcsd(int fd, guint8 index, guint8 value)
{
struct mmc_ioc_cmd cmd;
memset(&cmd, 0, sizeof(cmd));
cmd.write_flag = 1;
cmd.opcode = MMC_SWITCH;
cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) | (index << 16) |
(value << 8) | EXT_CSD_CMD_SET_NORMAL;
cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
return ioctl(fd, MMC_IOC_CMD, &cmd);
}
gboolean r_emmc_write_bootpart(const gchar *device, gint bootpart_active, GError **error)
{
g_auto(filedesc) fd = -1;
guint8 extcsd[512];
guint8 value = 0;
g_return_val_if_fail(bootpart_active == 0 || bootpart_active == 1, FALSE);
fd = g_open(device, O_RDWR | O_EXCL);
if (fd == -1) {
int err = errno;
g_set_error(error, G_FILE_ERROR, g_file_error_from_errno(err),
"opening eMMC device failed: %s", g_strerror(err));
return FALSE;
}
if (r_emmc_read_extcsd(fd, extcsd)) {
g_set_error(error, R_EMMC_ERROR, R_EMMC_ERROR_IOCTL,
"Could not read from extcsd register %d in %s",
EXT_CSD_PART_CONFIG, device);
return FALSE;
}
/* Keep BOOT_ACK value as it is. Resetting this bit might prevent
* proper boot process on some platforms since in some SoCs, ROM boot
* loaders need this flag to be set.
* The PARTITION_ACCESS value is handled inside the kernel so we do not
* need to take care of it here. */
value = extcsd[EXT_CSD_PART_CONFIG] & (1 << 6);
/* write [5:3] : BOOT_PARTITION_ENABLE of PARTITION_CONFIG */
if (bootpart_active == 0)
value |= 0x08;
else if (bootpart_active == 1)
value |= 0x10;
if (r_emmc_write_extcsd(fd, EXT_CSD_PART_CONFIG, value)) {
g_set_error(error, R_EMMC_ERROR, R_EMMC_ERROR_IOCTL,
"Could not write 0x%02x to extcsd register %d in %s",
value, EXT_CSD_PART_CONFIG, device);
return FALSE;
}
return TRUE;
}
static gboolean r_emmc_force_part_write(const gchar *device, gchar value, GError **error)
{
gboolean ret = FALSE;
g_autofree gchar *device_basename = g_path_get_basename(device);
g_autofree gchar *sysfs_path = NULL;
FILE *f = NULL;
g_return_val_if_fail(value == '0' || value == '1', FALSE);
sysfs_path = g_strdup_printf("/sys/block/%s/force_ro", device_basename);
f = g_fopen(sysfs_path, "w");
if (!f) {
int err = errno;
g_set_error(error, G_FILE_ERROR, g_file_error_from_errno(err),
"Could not open device attribute %s: %s",
sysfs_path, g_strerror(err));
goto out;
}
if (fwrite(&value, 1, 1, f) != 1) {
g_set_error(error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
"Could not write to %s", sysfs_path);
goto out;
}
ret = TRUE;
out:
if (f)
fclose(f);
return ret;
}
gboolean r_emmc_force_part_ro(const gchar *device, GError **error)
{
gboolean ret = FALSE;
GError *ierror = NULL;
ret = r_emmc_force_part_write(device, '1', &ierror);
if (!ret)
g_propagate_prefixed_error(error, ierror,
"failed forcing ro: ");
return ret;
}
gboolean r_emmc_force_part_rw(const gchar *device, GError **error)
{
gboolean ret = FALSE;
GError *ierror = NULL;
ret = r_emmc_force_part_write(device, '0', &ierror);
if (!ret)
g_propagate_prefixed_error(error, ierror,
"failed forcing rw: ");
return ret;
}
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