scsi: ips: fix firmware timestamps for 32-bit

do_gettimeofday() is deprecated since it will stop working in 2038 on
32-bit platforms, leading to incorrect times passed to the firmware.
On 64-bit platforms the current code appears to be fine, as the
calculation passes an 8-bit century number into the firmware that can
represent times long in the future (possibly until 25599).

Using ktime_get_real_seconds() to get a 64-bit seconds value and
time64_to_tm() to convert it into the firmware format greatly simplifies
the ips timekeeping code, makes 32-bit and 64-bit behave the same way
here, and gets us closer to removing the deprecated interfaces.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/ips.h

@@ -402,16 +402,7 @@
    #define IPS_BIOS_HEADER             0xC0
 
    /* time oriented stuff */
-   #define IPS_IS_LEAP_YEAR(y)           (((y % 4 == 0) && ((y % 100 != 0) || (y % 400 == 0))) ? 1 : 0)
-   #define IPS_NUM_LEAP_YEARS_THROUGH(y) ((y) / 4 - (y) / 100 + (y) / 400)
-
-   #define IPS_SECS_MIN                 60
-   #define IPS_SECS_HOUR                3600
    #define IPS_SECS_8HOURS              28800
-   #define IPS_SECS_DAY                 86400
-   #define IPS_DAYS_NORMAL_YEAR         365
-   #define IPS_DAYS_LEAP_YEAR           366
-   #define IPS_EPOCH_YEAR               1970
 
    /*
     * Scsi_Host Template
@@ -1054,7 +1045,7 @@ typedef struct ips_ha {
    uint8_t            active;
    int                ioctl_reset;        /* IOCTL Requested Reset Flag */
    uint16_t           reset_count;        /* number of resets           */
-   time_t             last_ffdc;          /* last time we sent ffdc info*/
+   time64_t           last_ffdc;          /* last time we sent ffdc info*/
    uint8_t            slot_num;           /* PCI Slot Number            */
    int                ioctl_len;          /* size of ioctl buffer       */
    dma_addr_t         ioctl_busaddr;      /* dma address of ioctl buffer*/