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caf9478624
RTC second scratch register[32-bit]: -zero byte hold boot count value -first byte hold update available state -second byte hold version -third byte hold magic number Signed-off-by: Gireesh Hiremath <Gireesh.Hiremath@in.bosch.com> Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com> Link: https://lore.kernel.org/r/20210611161350.2141-17-Gireesh.Hiremath@in.bosch.com Gbp-Pq: Topic apertis/guardian Gbp-Pq: Name am335x-guardian-software-update-available-status-is-store.patch
57 lines
1.4 KiB
C
57 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2011
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* Heiko Schocher, DENX Software Engineering, hs@denx.de.
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* (C) Copyright 2018 Robert Bosch Power Tools GmbH.
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*
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* A bootcount driver for the RTC IP block found on many TI platforms.
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* This requires the RTC clocks, etc, to be enabled prior to use and
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* not all boards with this IP block on it will have the RTC in use.
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*/
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#include <bootcount.h>
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#include <asm/davinci_rtc.h>
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#define BC_VERSION 2
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void bootcount_store(ulong bootcount)
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{
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u8 upgrade_available = 0;
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ulong val = 0;
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struct davinci_rtc *reg =
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(struct davinci_rtc *)CONFIG_SYS_BOOTCOUNT_ADDR;
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val = raw_bootcount_load(®->scratch2);
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upgrade_available = (val >> 8) & 0x000000ff;
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/* Only update bootcount during upgrade process */
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if (!upgrade_available)
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bootcount = 0;
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val = (bootcount & 0x000000ff) |
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(upgrade_available << 8) |
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(BC_VERSION << 16) |
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(CONFIG_SYS_BOOTCOUNT_MAGIC << 24);
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/*
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* write RTC kick registers to enable write
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* for RTC Scratch registers. Scratch register 2 is
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* used for bootcount value.
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*/
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writel(RTC_KICK0R_WE, ®->kick0r);
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writel(RTC_KICK1R_WE, ®->kick1r);
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raw_bootcount_store(®->scratch2, val);
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}
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ulong bootcount_load(void)
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{
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unsigned long val = 0;
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struct davinci_rtc *reg =
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(struct davinci_rtc *)CONFIG_SYS_BOOTCOUNT_ADDR;
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val = raw_bootcount_load(®->scratch2);
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if ((val >> 24) != CONFIG_SYS_BOOTCOUNT_MAGIC)
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return 0;
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else
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return val & 0x000000ff;
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}
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