linux-kernel - [PATCH v2 1/8] ARM: tegra: export the chipid

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Message-Id: <1328028051-24271-2-git-send-email-pdeschrijver@nvidia.com>
Date:	Tue, 31 Jan 2012 18:40:39 +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 v2 1/8] ARM: tegra: export the chipid

Export a variable containing the Tegra chipid. This will be used by the SMP
code to distinguish between Tegra variants. Also initialize the Tegra chipid
on Tegra30.

Signed-off-by: Peter De Schrijver <pdeschrijver@...dia.com>
---
 arch/arm/mach-tegra/common.c |    1 +
 arch/arm/mach-tegra/fuse.c   |   18 +++++++++++-------
 arch/arm/mach-tegra/fuse.h   |    4 ++++
 3 files changed, 16 insertions(+), 7 deletions(-)

diff --git a/arch/arm/mach-tegra/common.c b/arch/arm/mach-tegra/common.c
index 1b1dee0..51dcbdff 100644
--- a/arch/arm/mach-tegra/common.c
+++ b/arch/arm/mach-tegra/common.c
@@ -122,6 +122,7 @@ void __init tegra20_init_early(void)
 #ifdef CONFIG_ARCH_TEGRA_3x_SOC
 void __init tegra30_init_early(void)
 {
+	tegra_init_fuse();
 	tegra30_init_clocks();
 	tegra_init_cache(0x441, 0x551);
 }
diff --git a/arch/arm/mach-tegra/fuse.c b/arch/arm/mach-tegra/fuse.c
index adfa429..3298880 100644
--- a/arch/arm/mach-tegra/fuse.c
+++ b/arch/arm/mach-tegra/fuse.c
@@ -34,6 +34,7 @@
 int tegra_sku_id;
 int tegra_cpu_process_id;
 int tegra_core_process_id;
+int tegra_chip_id;
 enum tegra_revision tegra_revision;
 
 /* The BCT to use at boot is specified by board straps that can be read
@@ -66,12 +67,9 @@ static inline bool get_spare_fuse(int bit)
 	return tegra_fuse_readl(FUSE_SPARE_BIT + bit * 4);
 }
 
-static enum tegra_revision tegra_get_revision(void)
+static enum tegra_revision tegra_get_revision(u32 id)
 {
-	void __iomem *chip_id = IO_ADDRESS(TEGRA_APB_MISC_BASE) + 0x804;
-	u32 id = readl(chip_id);
 	u32 minor_rev = (id >> 16) & 0xf;
-	u32 chipid = (id >> 8) & 0xff;
 
 	switch (minor_rev) {
 	case 1:
@@ -79,7 +77,8 @@ static enum tegra_revision tegra_get_revision(void)
 	case 2:
 		return TEGRA_REVISION_A02;
 	case 3:
-		if (chipid == 0x20 && (get_spare_fuse(18) || get_spare_fuse(19)))
+		if (tegra_chip_id == TEGRA20 &&
+			(get_spare_fuse(18) || get_spare_fuse(19)))
 			return TEGRA_REVISION_A03p;
 		else
 			return TEGRA_REVISION_A03;
@@ -92,6 +91,8 @@ static enum tegra_revision tegra_get_revision(void)
 
 void tegra_init_fuse(void)
 {
+	u32 id;
+
 	u32 reg = readl(IO_TO_VIRT(TEGRA_CLK_RESET_BASE + 0x48));
 	reg |= 1 << 28;
 	writel(reg, IO_TO_VIRT(TEGRA_CLK_RESET_BASE + 0x48));
@@ -108,10 +109,13 @@ void tegra_init_fuse(void)
 	reg = tegra_apb_readl(TEGRA_APB_MISC_BASE + STRAP_OPT);
 	tegra_bct_strapping = (reg & RAM_ID_MASK) >> RAM_CODE_SHIFT;
 
-	tegra_revision = tegra_get_revision();
+	id = readl_relaxed(IO_ADDRESS(TEGRA_APB_MISC_BASE) + 0x804);
+	tegra_chip_id = (id >> 8) & 0xff;
+
+	tegra_revision = tegra_get_revision(id);
 
 	pr_info("Tegra Revision: %s SKU: %d CPU Process: %d Core Process: %d\n",
-		tegra_revision_name[tegra_get_revision()],
+		tegra_revision_name[tegra_revision],
 		tegra_sku_id, tegra_cpu_process_id,
 		tegra_core_process_id);
 }
diff --git a/arch/arm/mach-tegra/fuse.h b/arch/arm/mach-tegra/fuse.h
index d65d2ab..d2107b2 100644
--- a/arch/arm/mach-tegra/fuse.h
+++ b/arch/arm/mach-tegra/fuse.h
@@ -35,9 +35,13 @@ enum tegra_revision {
 #define SKU_ID_AP25E	27
 #define SKU_ID_T25E	28
 
+#define TEGRA20		0x20
+#define TEGRA30		0x30
+
 extern int tegra_sku_id;
 extern int tegra_cpu_process_id;
 extern int tegra_core_process_id;
+extern int tegra_chip_id;
 extern enum tegra_revision tegra_revision;
 
 extern int tegra_bct_strapping;
-- 
1.7.7.rc0.72.g4b5ea.dirty

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