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Subject[PATCH v3 2/8] arm/tegra: prepare early init for multiple tegra variants
Date
This patch splits the early init code in a common and a tegra20 specific part.
L2 cache initialization is generalized and discovers the cache associativity
at runtime. Also use arm_pm_restart instead of arm_arch_reset and reset the
the system using the PMC reset feature rather then the CAR system reset.

Signed-off-by: Peter De Schrijver <pdeschrijver@nvidia.com>
---
arch/arm/mach-tegra/board-dt.c | 19 +++++++++++++++
arch/arm/mach-tegra/board-harmony.c | 2 +-
arch/arm/mach-tegra/board-paz00.c | 2 +-
arch/arm/mach-tegra/board-seaboard.c | 6 ++--
arch/arm/mach-tegra/board-trimslice.c | 2 +-
arch/arm/mach-tegra/board.h | 4 +--
arch/arm/mach-tegra/common.c | 41 +++++++++++++++++++++-----------
7 files changed, 53 insertions(+), 23 deletions(-)
diff --git a/arch/arm/mach-tegra/board-dt.c b/arch/arm/mach-tegra/board-dt.c
index d368f8d..a7bae50 100644
--- a/arch/arm/mach-tegra/board-dt.c
+++ b/arch/arm/mach-tegra/board-dt.c
@@ -118,6 +118,25 @@ static void __init tegra_dt_init(void)
of_platform_populate(NULL, tegra_dt_match_table, tegra20_auxdata_lookup, NULL);
}

+static struct {
+ const char *machine;
+ void (*init)(void);
+} early_init[] __initdata = {
+ { "nvidia,tegra20", tegra20_init_early },
+};
+
+static void __init tegra_init_early(void)
+{
+
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(early_init); i++)
+ if (of_machine_is_compatible(early_init[i].machine))
+ return early_init[i].init();
+
+ pr_warn("Unknown platform detected\n");
+}
+
static const char * tegra_dt_board_compat[] = {
"nvidia,harmony",
"nvidia,seaboard",
diff --git a/arch/arm/mach-tegra/board-harmony.c b/arch/arm/mach-tegra/board-harmony.c
index f0bdc5e..c422aeb 100644
--- a/arch/arm/mach-tegra/board-harmony.c
+++ b/arch/arm/mach-tegra/board-harmony.c
@@ -185,7 +185,7 @@ MACHINE_START(HARMONY, "harmony")
.atag_offset = 0x100,
.fixup = tegra_harmony_fixup,
.map_io = tegra_map_common_io,
- .init_early = tegra_init_early,
+ .init_early = tegra20_init_early,
.init_irq = tegra_init_irq,
.timer = &tegra_timer,
.init_machine = tegra_harmony_init,
diff --git a/arch/arm/mach-tegra/board-paz00.c b/arch/arm/mach-tegra/board-paz00.c
index 602f8dd..6997a47 100644
--- a/arch/arm/mach-tegra/board-paz00.c
+++ b/arch/arm/mach-tegra/board-paz00.c
@@ -188,7 +188,7 @@ MACHINE_START(PAZ00, "Toshiba AC100 / Dynabook AZ")
.atag_offset = 0x100,
.fixup = tegra_paz00_fixup,
.map_io = tegra_map_common_io,
- .init_early = tegra_init_early,
+ .init_early = tegra20_init_early,
.init_irq = tegra_init_irq,
.timer = &tegra_timer,
.init_machine = tegra_paz00_init,
diff --git a/arch/arm/mach-tegra/board-seaboard.c b/arch/arm/mach-tegra/board-seaboard.c
index bf13ea3..5e42e08 100644
--- a/arch/arm/mach-tegra/board-seaboard.c
+++ b/arch/arm/mach-tegra/board-seaboard.c
@@ -282,7 +282,7 @@ static void __init tegra_wario_init(void)
MACHINE_START(SEABOARD, "seaboard")
.atag_offset = 0x100,
.map_io = tegra_map_common_io,
- .init_early = tegra_init_early,
+ .init_early = tegra20_init_early,
.init_irq = tegra_init_irq,
.timer = &tegra_timer,
.init_machine = tegra_seaboard_init,
@@ -291,7 +291,7 @@ MACHINE_END
MACHINE_START(KAEN, "kaen")
.atag_offset = 0x100,
.map_io = tegra_map_common_io,
- .init_early = tegra_init_early,
+ .init_early = tegra20_init_early,
.init_irq = tegra_init_irq,
.timer = &tegra_timer,
.init_machine = tegra_kaen_init,
@@ -300,7 +300,7 @@ MACHINE_END
MACHINE_START(WARIO, "wario")
.atag_offset = 0x100,
.map_io = tegra_map_common_io,
- .init_early = tegra_init_early,
+ .init_early = tegra20_init_early,
.init_irq = tegra_init_irq,
.timer = &tegra_timer,
.init_machine = tegra_wario_init,
diff --git a/arch/arm/mach-tegra/board-trimslice.c b/arch/arm/mach-tegra/board-trimslice.c
index e008c0e..7117e81 100644
--- a/arch/arm/mach-tegra/board-trimslice.c
+++ b/arch/arm/mach-tegra/board-trimslice.c
@@ -175,7 +175,7 @@ MACHINE_START(TRIMSLICE, "trimslice")
.atag_offset = 0x100,
.fixup = tegra_trimslice_fixup,
.map_io = tegra_map_common_io,
- .init_early = tegra_init_early,
+ .init_early = tegra20_init_early,
.init_irq = tegra_init_irq,
.timer = &tegra_timer,
.init_machine = tegra_trimslice_init,
diff --git a/arch/arm/mach-tegra/board.h b/arch/arm/mach-tegra/board.h
index 1d14df7..b86cdab 100644
--- a/arch/arm/mach-tegra/board.h
+++ b/arch/arm/mach-tegra/board.h
@@ -23,9 +23,7 @@

#include <linux/types.h>

-void tegra_assert_system_reset(char mode, const char *cmd);
-
-void __init tegra_init_early(void);
+void __init tegra20_init_early(void);
void __init tegra_map_common_io(void);
void __init tegra_init_irq(void);
void __init tegra_init_clock(void);
diff --git a/arch/arm/mach-tegra/common.c b/arch/arm/mach-tegra/common.c
index 03c2bd4..35cf81a 100644
--- a/arch/arm/mach-tegra/common.c
+++ b/arch/arm/mach-tegra/common.c
@@ -1,5 +1,5 @@
/*
- * arch/arm/mach-tegra/board-harmony.c
+ * arch/arm/mach-tegra/common.c
*
* Copyright (C) 2010 Google, Inc.
*
@@ -33,16 +33,15 @@

void tegra_assert_system_reset(char mode, const char *cmd)
{
- void __iomem *reset = IO_ADDRESS(TEGRA_CLK_RESET_BASE + 0x04);
+ void __iomem *reset = IO_ADDRESS(TEGRA_PMC_BASE + 0);
u32 reg;

- /* use *_related to avoid spinlock since caches are off */
reg = readl_relaxed(reset);
- reg |= 0x04;
+ reg |= 0x10;
writel_relaxed(reg, reset);
}

-static __initdata struct tegra_clk_init_table common_clk_init_table[] = {
+static __initdata struct tegra_clk_init_table tegra20_clk_init_table[] = {
/* name parent rate enabled */
{ "clk_m", NULL, 0, true },
{ "pll_p", "clk_m", 216000000, true },
@@ -59,25 +58,39 @@ static __initdata struct tegra_clk_init_table common_clk_init_table[] = {
{ NULL, NULL, 0, 0},
};

-static void __init tegra_init_cache(void)
+static void __init tegra_init_cache(u32 tag_latency, u32 data_latency)
{
#ifdef CONFIG_CACHE_L2X0
void __iomem *p = IO_ADDRESS(TEGRA_ARM_PERIF_BASE) + 0x3000;
+ u32 aux_ctrl;

- writel_relaxed(0x331, p + L2X0_TAG_LATENCY_CTRL);
- writel_relaxed(0x441, p + L2X0_DATA_LATENCY_CTRL);
+ writel_relaxed(tag_latency, p + L2X0_TAG_LATENCY_CTRL);
+ writel_relaxed(data_latency, p + L2X0_DATA_LATENCY_CTRL);

- l2x0_init(p, 0x6C080001, 0x8200c3fe);
+ aux_ctrl = readl(p + L2X0_CACHE_TYPE);
+ aux_ctrl = (aux_ctrl & 0x700) << (17-8);
+ aux_ctrl |= 0x6C000001;
+
+ l2x0_init(p, aux_ctrl, 0x8200c3fe);
#endif

}

-void __init tegra_init_early(void)
+static void __init tegra_setup_system_reset(void)
+{
+ arm_pm_restart = tegra_assert_system_reset;
+}
+
+static void __init tegra_common_init(void)
+{
+ tegra_setup_system_reset();
+}
+
+void __init tegra20_init_early(void)
{
tegra_init_fuse();
tegra_init_clock();
- tegra_clk_init_from_table(common_clk_init_table);
- tegra_init_cache();
-
- arm_arch_reset = tegra_assert_system_reset;
+ tegra_clk_init_from_table(tegra20_clk_init_table);
+ tegra_init_cache(0x331, 0x441);
+ tegra_common_init();
}
--
1.7.7.rc0.72.g4b5ea.dirty


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