linux-kernel - [PATCH v3 09/10] ARM: tegra: support for Tegra30 CPU powerdomains

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Message-Id: <1328831277-21002-10-git-send-email-pdeschrijver@nvidia.com>
Date:	Fri, 10 Feb 2012 01:47:49 +0200
From:	Peter De Schrijver <pdeschrijver@...dia.com>
To:	Peter De Schrijver <pdeschrijver@...dia.com>
Cc:	Colin Cross <ccross@...roid.com>, Olof Johansson <olof@...om.net>,
	Stephen Warren <swarren@...dia.com>,
	Russell King <linux@....linux.org.uk>,
	Gary King <gking@...dia.com>, Arnd Bergmann <arnd@...db.de>,
	linux-tegra@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v3 09/10] ARM: tegra: support for Tegra30 CPU powerdomains

Secondary CPU powerdomains can be powergated on Tegra30. Add the necessary
functions to do this. This will be used to boot the secondary CPUs later on.

Signed-off-by: Peter De Schrijver <pdeschrijver@...dia.com>
---
 arch/arm/mach-tegra/common.c                 |    3 +++
 arch/arm/mach-tegra/include/mach/powergate.h |    3 +++
 arch/arm/mach-tegra/powergate.c              |   19 ++++++++++++++++++-
 3 files changed, 24 insertions(+), 1 deletions(-)

diff --git a/arch/arm/mach-tegra/common.c b/arch/arm/mach-tegra/common.c
index bdc5d5e..68815ce 100644
--- a/arch/arm/mach-tegra/common.c
+++ b/arch/arm/mach-tegra/common.c
@@ -27,6 +27,7 @@
 #include <asm/hardware/gic.h>
 
 #include <mach/iomap.h>
+#include <mach/powergate.h>
 
 #include "board.h"
 #include "clock.h"
@@ -120,6 +121,7 @@ void __init tegra20_init_early(void)
 	tegra_clk_init_from_table(tegra20_clk_init_table);
 	tegra_init_cache(0x331, 0x441);
 	tegra_pmc_init();
+	tegra_powergate_init();
 }
 #endif
 #ifdef CONFIG_ARCH_TEGRA_3x_SOC
@@ -129,5 +131,6 @@ void __init tegra30_init_early(void)
 	tegra30_init_clocks();
 	tegra_init_cache(0x441, 0x551);
 	tegra_pmc_init();
+	tegra_powergate_init();
 }
 #endif
diff --git a/arch/arm/mach-tegra/include/mach/powergate.h b/arch/arm/mach-tegra/include/mach/powergate.h
index ca41186..4752b1a 100644
--- a/arch/arm/mach-tegra/include/mach/powergate.h
+++ b/arch/arm/mach-tegra/include/mach/powergate.h
@@ -38,6 +38,9 @@
 #define TEGRA_POWERGATE_CPU0	TEGRA_POWERGATE_CPU
 #define TEGRA_POWERGATE_3D0	TEGRA_POWERGATE_3D
 
+int  __init tegra_powergate_init(void);
+
+int tegra_cpu_powergate_id(int cpuid);
 int tegra_powergate_is_powered(int id);
 int tegra_powergate_power_on(int id);
 int tegra_powergate_power_off(int id);
diff --git a/arch/arm/mach-tegra/powergate.c b/arch/arm/mach-tegra/powergate.c
index 7120ad7..c238699 100644
--- a/arch/arm/mach-tegra/powergate.c
+++ b/arch/arm/mach-tegra/powergate.c
@@ -41,6 +41,14 @@
 #define PWRGATE_STATUS		0x38
 
 static int tegra_num_powerdomains;
+static int tegra_num_cpu_domains;
+static u8 *tegra_cpu_domains;
+static u8 tegra30_cpu_domains[] = {
+	TEGRA_POWERGATE_CPU0,
+	TEGRA_POWERGATE_CPU1,
+	TEGRA_POWERGATE_CPU2,
+	TEGRA_POWERGATE_CPU3,
+};
 
 static DEFINE_SPINLOCK(tegra_powergate_lock);
 
@@ -161,6 +169,14 @@ err_power:
 	return ret;
 }
 
+int tegra_cpu_powergate_id(int cpuid)
+{
+	if (cpuid > 0 && cpuid < tegra_num_cpu_domains)
+		return tegra_cpu_domains[cpuid];
+
+	return -EINVAL;
+}
+
 int __init tegra_powergate_init(void)
 {
 	switch (tegra_chip_id) {
@@ -169,6 +185,8 @@ int __init tegra_powergate_init(void)
 		break;
 	case TEGRA30:
 		tegra_num_powerdomains = 14;
+		tegra_num_cpu_domains = 4;
+		tegra_cpu_domains = tegra30_cpu_domains;
 		break;
 	default:
 		/* Unknown Tegra variant. Disable powergating */
@@ -178,7 +196,6 @@ int __init tegra_powergate_init(void)
 
 	return 0;
 }
-arch_initcall(tegra_powergate_init);
 
 #ifdef CONFIG_DEBUG_FS
 
-- 
1.7.4.1

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