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km: qrio: add access functions for ebootcount

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The EBOOTCNT is a reserved persistent static memory area in QRIO,
and similar to BOOTCNT is intended to be used as boot counter location.

Comparable to BOOTCNT that is reserved for u-boot main bootcount
infrastructure, EBOOTCNT is intended to be used for pg-wcom board
specific purposes (e.g implementing early boot counter for fail-safe
u-boot update).

Signed-off-by: Aleksandar Gerasimovski <aleksandar.gerasimovski@hitachienergy.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
This commit is contained in:
Aleksandar Gerasimovski 2021-11-16 12:53:28 +00:00 committed by Priyanka Jain
parent 70003e52f4
commit de144d5ffe
2 changed files with 41 additions and 0 deletions
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3
board/keymile/common/common.h
View file

@ -133,6 +133,9 @@ int get_testpin(void);
int set_km_env(void);
ulong early_bootcount_load(void);
void early_bootcount_store(ulong ebootcount);
#define DELAY_ABORT_SEQ 62 /* @200kHz 9 clocks = 44us, 62us is ok */
#define DELAY_HALF_PERIOD (500 / (CONFIG_SYS_I2C_SPEED / 1000))

38
board/keymile/common/qrio.c
View file

@ -270,6 +270,44 @@ void qrio_uprstreq(u8 mode)
out_8(qrio_base + RSTCFG_OFF, rstcfg);
}
/* Early bootcount memory area is avilable starting from QRIO3 Rev.2 */
#define QRIO3_ID 0x71
#define QRIO3_REV 0x02
#define EBOOTCNT_OFF 0x28
ulong early_bootcount_load(void)
{
void __iomem *qrio_base = (void *)CONFIG_SYS_QRIO_BASE;
u16 id_rev = in_be16(qrio_base + ID_REV_OFF);
u8 id = (id_rev >> 8) & 0xff;
u8 rev = id_rev & 0xff;
u32 ebootcount = 0;
if (id == QRIO3_ID && rev >= QRIO3_REV) {
ebootcount = in_be32(qrio_base + EBOOTCNT_OFF);
} else {
printf("QRIO: warning: early bootcount not supported, ");
printf("id = %u, rev = %u\n", id, rev);
}
return ebootcount;
}
void early_bootcount_store(ulong ebootcount)
{
void __iomem *qrio_base = (void *)CONFIG_SYS_QRIO_BASE;
u16 id_rev = in_be16(qrio_base + ID_REV_OFF);
u8 id = (id_rev >> 8) & 0xff;
u8 rev = id_rev & 0xff;
if (id == QRIO3_ID && rev >= QRIO3_REV) {
out_be32(qrio_base + EBOOTCNT_OFF, ebootcount);
} else {
printf("QRIO: warning: early bootcount not supported, ");
printf("id = %u, rev = %u\n", id, rev);
}
}
/* I2C deblocking uses the algorithm defined in board/keymile/common/common.c
* 2 dedicated QRIO GPIOs externally pull the SCL and SDA lines
* For I2C only the low state is activly driven and high state is pulled-up