linux-kernel - [PATCH] power: reset: ocelot: switch the SI to boot mode

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Message-Id: <20181109195700.28321-1-alexandre.belloni@bootlin.com>
Date:   Fri,  9 Nov 2018 20:57:00 +0100
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Sebastian Reichel <sre@...nel.org>
Cc:     UNGLinuxDriver@...rochip.com, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Alexandre Belloni <alexandre.belloni@...tlin.com>
Subject: [PATCH] power: reset: ocelot: switch the SI to boot mode

Switch the SI to boot mode so on a warm reboot, the SI is able to access
the flash.

Signed-off-by: Alexandre Belloni <alexandre.belloni@...tlin.com>
---
 drivers/power/reset/ocelot-reset.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/power/reset/ocelot-reset.c b/drivers/power/reset/ocelot-reset.c
index 5a13a5cc8188..419952c61fd0 100644
--- a/drivers/power/reset/ocelot-reset.c
+++ b/drivers/power/reset/ocelot-reset.c
@@ -26,6 +26,13 @@ struct ocelot_reset_context {
 
 #define SOFT_CHIP_RST BIT(0)
 
+#define ICPU_CFG_CPU_SYSTEM_CTRL_GENERAL_CTRL	0x24
+#define IF_SI_OWNER_MASK			GENMASK(1, 0)
+#define IF_SI_OWNER_SISL			0
+#define IF_SI_OWNER_SIBM			1
+#define IF_SI_OWNER_SIMC			2
+#define IF_SI_OWNER_OFFSET			4
+
 static int ocelot_restart_handle(struct notifier_block *this,
 				 unsigned long mode, void *cmd)
 {
@@ -37,6 +44,11 @@ static int ocelot_restart_handle(struct notifier_block *this,
 	regmap_update_bits(ctx->cpu_ctrl, ICPU_CFG_CPU_SYSTEM_CTRL_RESET,
 			   CORE_RST_PROTECT, 0);
 
+	/* Make the SI back to boot mode */
+	regmap_update_bits(ctx->cpu_ctrl, ICPU_CFG_CPU_SYSTEM_CTRL_GENERAL_CTRL,
+			   IF_SI_OWNER_MASK << IF_SI_OWNER_OFFSET,
+			   IF_SI_OWNER_SIBM << IF_SI_OWNER_OFFSET);
+
 	writel(SOFT_CHIP_RST, ctx->base);
 
 	pr_emerg("Unable to restart system\n");
-- 
2.19.1