Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 14cd632c authored by Stepan Moskovchenko's avatar Stepan Moskovchenko Committed by Matt Wagantall
Browse files

power: reset: msm: Allow configuring reset type via secure I/O 



Some targets require that the Download Mode / EDL
configuration be performed by means of a Secure I/O write
to the TCSR_BOOT_MISC_DETECT register rather than through a
generic SCM operation. Provide a mechanism for specifying
the address of this register in the device tree, to use as
a fallback method if the generic SCM call to set the
download mode configuration is unavailable.

This is necessary to comply with atomicity requirements of the
secure environment.

Change-Id: I5d3fcb48b0b47815d4839a3b722b0462a1bca087
Signed-off-by: default avatarStepan Moskovchenko <stepanm@codeaurora.org>
parent 771d9b37

Documentation/devicetree/bindings/power_supply/msm-poweroff.txt

+7 −0
Original line number Diff line number Diff line
@@ -9,6 +9,13 @@ Required Properties: 
-compatible: "qcom,pshold"

-reg: Specifies the physical address of the ps-hold register



Optional Properties:

-reg: A secondary reg address/size pair may be provided, to specify the address

      of the TCSR_BOOT_MISC_DETECT register. This address is typically used to

      configure the type of reset desired. Omitting this address implies that

      the reset type shall be configured by means of a call to the secure

      environment.



Example:



	restart@fc4ab000 {

drivers/power/reset/msm-poweroff.c

+10 −1
Original line number Diff line number Diff line
@@ -51,6 +51,7 @@ static bool scm_pmic_arbiter_disable_supported; 
static bool scm_deassert_ps_hold_supported;

/* Download mode master kill-switch */

static void __iomem *msm_ps_hold;

static phys_addr_t tcsr_boot_misc_detect;



#ifdef CONFIG_MSM_DLOAD_MODE

#define EDL_MODE_PROP "qcom,msm-imem-emergency_download_mode"
@@ -85,8 +86,12 @@ int scm_set_dload_mode(int arg1, int arg2) 
		.arginfo = SCM_ARGS(2),

	};



	if (!scm_dload_supported)

	if (!scm_dload_supported) {

		if (tcsr_boot_misc_detect)

			return scm_io_write(tcsr_boot_misc_detect, arg1);



		return 0;

	}



	if (!is_scm_armv8())

		return scm_call_atomic2(SCM_SVC_BOOT, SCM_DLOAD_CMD, arg1,
@@ -402,6 +407,10 @@ static int msm_restart_probe(struct platform_device *pdev) 
	if (IS_ERR(msm_ps_hold))

		return PTR_ERR(msm_ps_hold);



	mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);

	if (mem)

		tcsr_boot_misc_detect = mem->start;



	pm_power_off = do_msm_poweroff;

	arm_pm_restart = do_msm_restart;