[PATCH 1/2] rockchip: rk3576: Allow pmu sram access for non-secure masters

[Jonas Karlman]

The firewall block access to pmu sram for non-secure masters by default
after reset (0xffffbfff).

Change the pmu lookup configuration to match the default lookup config
for ddr and system sram (0xffff3fff) to allow loading TF-A using DMA.

Mainline TF-A will re-configure the firewall to use an even less
restrictive lookup (0xbffe3ff0), so this change is not expected to have
any real security implication.

Signed-off-by: Jonas Karlman <jonas at kwiboo.se>
---
 arch/arm/mach-rockchip/rk3576/rk3576.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/arm/mach-rockchip/rk3576/rk3576.c b/arch/arm/mach-rockchip/rk3576/rk3576.c
index a1e8a7572fa4..c17ba418ced5 100644
--- a/arch/arm/mach-rockchip/rk3576/rk3576.c
+++ b/arch/arm/mach-rockchip/rk3576/rk3576.c
@@ -26,6 +26,9 @@
 #define SYS_SGRF_SOC_CON15	0x005C
 #define SYS_SGRF_SOC_CON20	0x0070
 
+#define FW_PMU1SGRF_BASE	0x26003000
+#define PMU1SGRF_SLV_LOOKUP0	0x80
+
 #define FW_SYS_SGRF_BASE	0x26005000
 #define SGRF_DOMAIN_CON1	0x4
 #define SGRF_DOMAIN_CON2	0x8
@@ -140,6 +143,9 @@ int arch_cpu_init(void)
 	if (!IS_ENABLED(CONFIG_SPL_BUILD))
 		return 0;
 
+	/* Allow pmu sram access for non-secure masters */
+	writel(0xffff3fff, FW_PMU1SGRF_BASE + PMU1SGRF_SLV_LOOKUP0);
+
 	/* Set the emmc to access ddr memory */
 	val = readl(FW_SYS_SGRF_BASE + SGRF_DOMAIN_CON2);
 	writel(val | 0x7, FW_SYS_SGRF_BASE + SGRF_DOMAIN_CON2);
-- 
2.52.0