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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@bootlin.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
hifive-unleashed-5.1
Alexandre Belloni 2018-11-09 20:57:00 +01:00 committed by Sebastian Reichel
parent 76ee875c2f
commit 9afe62509b
1 changed files with 12 additions and 0 deletions
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12
drivers/power/reset/ocelot-reset.c
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@ -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");