linux-kernel - [PATCH 2/2] ARM: i.MX25: globally disable supervisor protect

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Message-Id: <1485890402-22974-2-git-send-email-martin@kaiser.cx>
Date:   Tue, 31 Jan 2017 20:20:02 +0100
From:   Martin Kaiser <martin@...ser.cx>
To:     Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <kernel@...gutronix.de>,
        Steffen Trumtrar <s.trumtrar@...gutronix.de>
Cc:     linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Martin Kaiser <martin@...ser.cx>
Subject: [PATCH 2/2] ARM: i.MX25: globally disable supervisor protect

The problem described in 6befda9a272b98bfb1dc772efc3564644cbfb270
for the i.MX53 platform applies to i.MX25 as well.

E.g. CSPI1+SDMA and SSI1+SDMA are not working with the default AIPS
configuration. Modifiy the AIPS configuration to allow access to the bus
by SDMA and peripherals.

Signed-off-by: Martin Kaiser <martin@...ser.cx>
---
 arch/arm/mach-imx/mach-imx25.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/arm/mach-imx/mach-imx25.c b/arch/arm/mach-imx/mach-imx25.c
index 32dcb5e..353b86e 100644
--- a/arch/arm/mach-imx/mach-imx25.c
+++ b/arch/arm/mach-imx/mach-imx25.c
@@ -23,6 +23,11 @@ static void __init imx25_init_early(void)
 	mxc_set_cpu_type(MXC_CPU_MX25);
 }
 
+static void __init imx25_dt_init(void)
+{
+	imx_aips_allow_unprivileged_access("fsl,imx25-aips");
+}
+
 static void __init mx25_init_irq(void)
 {
 	struct device_node *np;
@@ -41,6 +46,7 @@ static const char * const imx25_dt_board_compat[] __initconst = {
 
 DT_MACHINE_START(IMX25_DT, "Freescale i.MX25 (Device Tree Support)")
 	.init_early	= imx25_init_early,
+	.init_machine	= imx25_dt_init,
 	.init_late      = imx25_pm_init,
 	.init_irq	= mx25_init_irq,
 	.dt_compat	= imx25_dt_board_compat,
-- 
2.1.4