From: Marek Vasut <marex@denx.de>
Date: Thu, 22 Dec 2022 00:46:42 +0000 (+0100)
Subject: arm: imx: imx8m: Program CSU and TZASC if PSCI provider
X-Git-Tag: v2025.01-rc5-pxa1908~1126^2~17
X-Git-Url: http://git.dujemihanovic.xyz/img/static/git-logo.png?a=commitdiff_plain;h=58552ab81b365bf5de8d40e2ea1978f6446e62c8;p=u-boot.git

arm: imx: imx8m: Program CSU and TZASC if PSCI provider

In case U-Boot is the PSCI provider, it is necessary to correctly
program CSU and TZASC registers. Those are poorly documented, so
push in the correct values.

Signed-off-by: Marek Vasut <marex@denx.de>
---

diff --git a/arch/arm/include/asm/arch-imx8m/imx-regs.h b/arch/arm/include/asm/arch-imx8m/imx-regs.h
index 3034d280cc..1559bf6d21 100644
--- a/arch/arm/include/asm/arch-imx8m/imx-regs.h
+++ b/arch/arm/include/asm/arch-imx8m/imx-regs.h
@@ -31,6 +31,7 @@
 #define CCM_BASE_ADDR		0x30380000
 #define SRC_BASE_ADDR		0x30390000
 #define GPC_BASE_ADDR		0x303A0000
+#define CSU_BASE_ADDR		0x303E0000
 
 #define SYSCNT_RD_BASE_ADDR	0x306A0000
 #define SYSCNT_CMP_BASE_ADDR	0x306B0000
diff --git a/arch/arm/mach-imx/imx8m/soc.c b/arch/arm/mach-imx/imx8m/soc.c
index cad9200dd1..df865e997d 100644
--- a/arch/arm/mach-imx/imx8m/soc.c
+++ b/arch/arm/mach-imx/imx8m/soc.c
@@ -561,6 +561,29 @@ static void imx8m_setup_snvs(void)
 	writel(0xffffffff, SNVS_BASE_ADDR + SNVS_LPSR);
 }
 
+static void imx8m_setup_csu_tzasc(void)
+{
+	const uintptr_t tzasc_base[4] = {
+		0x301f0000, 0x301f0000, 0x301f0000, 0x301f0000
+	};
+	int i, j;
+
+	if (!IS_ENABLED(CONFIG_ARMV8_PSCI))
+		return;
+
+	/* CSU */
+	for (i = 0; i < 64; i++)
+		writel(0x00ff00ff, (void *)CSU_BASE_ADDR + (4 * i));
+
+	/* TZASC */
+	for (j = 0; j < 4; j++) {
+		writel(0x77777777, (void *)(tzasc_base[j]));
+		writel(0x77777777, (void *)(tzasc_base[j]) + 0x4);
+		for (i = 0; i <= 0x10; i += 4)
+			writel(0, (void *)(tzasc_base[j]) + 0x40 + i);
+	}
+}
+
 int arch_cpu_init(void)
 {
 	struct ocotp_regs *ocotp = (struct ocotp_regs *)OCOTP_BASE_ADDR;
@@ -613,6 +636,8 @@ int arch_cpu_init(void)
 
 	imx8m_setup_snvs();
 
+	imx8m_setup_csu_tzasc();
+
 	return 0;
 }