linux-kernel - [PATCH v4 8/8] ARM: tegra: Add firmware calls required for suspend-resume

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Message-Id: <20190218001726.16785-9-digetx@gmail.com>
Date:   Mon, 18 Feb 2019 03:17:26 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Russell King <linux@...linux.org.uk>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Robert Yang <decatf@...il.com>,
        Michał Mirosław <mirq-linux@...e.qmqm.pl>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v4 8/8] ARM: tegra: Add firmware calls required for suspend-resume

In order to resume CPU from suspend via trusted Foundations firmware,
the LP1/LP2 boot vectors shall be specified using the firmware calls.

Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 arch/arm/mach-tegra/pm.c            | 14 ++++++++++++++
 arch/arm/mach-tegra/reset-handler.S | 26 ++++++++++++++++++++++++++
 2 files changed, 40 insertions(+)

diff --git a/arch/arm/mach-tegra/pm.c b/arch/arm/mach-tegra/pm.c
index 66c8cd63dd86..97bdfffc244e 100644
--- a/arch/arm/mach-tegra/pm.c
+++ b/arch/arm/mach-tegra/pm.c
@@ -33,6 +33,7 @@
 #include <soc/tegra/pmc.h>
 
 #include <asm/cacheflush.h>
+#include <asm/firmware.h>
 #include <asm/idmap.h>
 #include <asm/proc-fns.h>
 #include <asm/smp_plat.h>
@@ -207,6 +208,8 @@ void tegra_idle_lp2_last(void)
 	if (trusted_foundations_registered())
 		outer_disable();
 
+	call_firmware_op(prepare_idle, TF_PM_MODE_LP2);
+
 	cpu_suspend(PHYS_OFFSET - PAGE_OFFSET, &tegra_sleep_cpu);
 
 	/*
@@ -368,6 +371,17 @@ static int tegra_suspend_enter(suspend_state_t state)
 	if (trusted_foundations_registered())
 		outer_disable();
 
+	switch (mode) {
+	case TEGRA_SUSPEND_LP1:
+		call_firmware_op(prepare_idle, TF_PM_MODE_LP1);
+		break;
+	case TEGRA_SUSPEND_LP2:
+		call_firmware_op(prepare_idle, TF_PM_MODE_LP2);
+		break;
+	default:
+		break;
+	}
+
 	cpu_suspend(PHYS_OFFSET - PAGE_OFFSET, tegra_sleep_func);
 
 	/*
diff --git a/arch/arm/mach-tegra/reset-handler.S b/arch/arm/mach-tegra/reset-handler.S
index c827b185d281..24fb375e11a9 100644
--- a/arch/arm/mach-tegra/reset-handler.S
+++ b/arch/arm/mach-tegra/reset-handler.S
@@ -20,6 +20,7 @@
 #include <soc/tegra/flowctrl.h>
 #include <soc/tegra/fuse.h>
 
+#include <asm/assembler.h>
 #include <asm/asm-offsets.h>
 #include <asm/cache.h>
 
@@ -76,6 +77,7 @@ ENTRY(tegra_resume)
 	orr	r1, r1, #1
 	str	r1, [r0]
 #endif
+	bl	tegra_resume_trusted_foundations
 
 #ifdef CONFIG_CACHE_L2X0
 	/* L2 cache resume & re-enable */
@@ -88,6 +90,30 @@ end_ca9_scu_l2_resume:
 
 	b	cpu_resume
 ENDPROC(tegra_resume)
+
+/*
+ *	tegra_resume_trusted_foundations
+ *
+ *	  Trusted Foundations firmware initialization.
+ *
+ *	Doesn't return if firmware presents.
+ *	Corrupted registers: r1, r2
+ */
+ENTRY(tegra_resume_trusted_foundations)
+	/* Check whether Trusted Foundations firmware presents. */
+	mov32	r2, TEGRA_IRAM_BASE + TEGRA_IRAM_RESET_HANDLER_OFFSET
+	ldr	r1, =__tegra_cpu_reset_handler_data_offset + \
+							RESET_DATA(TF_PRESENT)
+	ldr	r1, [r2, r1]
+	cmp	r1, #0
+	reteq	lr
+
+ .arch_extension sec
+	/* First call after suspend wakes firmware. No arguments required. */
+	smc	#0
+
+	b	cpu_resume
+ENDPROC(tegra_resume_trusted_foundations)
 #endif
 
 	.align L1_CACHE_SHIFT
-- 
2.20.1