[PATCH] ARM: ux500: remove pointless cache setup args
Russell King - ARM Linux
linux at arm.linux.org.uk
Fri Mar 21 10:03:09 EDT 2014
On Fri, Mar 21, 2014 at 02:55:13PM +0100, Linus Walleij wrote:
> This removes the setup of the l2x0 lines that are essentially
> just noops bouncing on the hardware as the cache registers are
> protected in the secure world and there is no point in writing
> them. Put in (0, ~0) to the l2x0_of_init() function as
> suggested by Russell and cut the complex code out.
>
> Reported-by: Russell King <rmk+kernel at arm.linux.org.uk>
> Signed-off-by: Linus Walleij <linus.walleij at linaro.org>
> ---
> Russell: I don't know how this fits with other changes hitting
> the l2x0 code, this file is pretty much stand-alone and
> orthogonal to any other stuff hitting the Ux500 code, so I
> can put it in your patch tracker if you want to take it or
> some version of it into your tree.
I already have something which does a similar modification. Here's
the existing commits in order (copy'n'pasted with gpm so whitespace
damaged):
Author: Russell King <rmk+kernel at arm.linux.org.uk>
Date: Sun Mar 16 19:15:21 2014 +0000
ARM: l2c: ux500: implement dummy write_sec method
ux500 can't write to any of the secure registers on the L2C controllers,
so provide a dummy handler which ignores all writes.
Signed-off-by: Russell King <rmk+kernel at arm.linux.org.uk>
diff --git a/arch/arm/mach-ux500/cache-l2x0.c b/arch/arm/mach-ux500/cache-l2x0.cindex 264f894c0e3d..5cc7e3625d8c 100644
--- a/arch/arm/mach-ux500/cache-l2x0.c
+++ b/arch/arm/mach-ux500/cache-l2x0.c
@@ -35,6 +35,14 @@ static int __init ux500_l2x0_unlock(void)
return 0;
}
+static void ux500_l2c310_write_sec(unsigned long val, unsigned reg)
+{
+ /*
+ * We can't write to secure registers as we are in non-secure
+ * mode, until we have some SMI service available.
+ */
+}
+
static int __init ux500_l2x0_init(void)
{
u32 aux_val = 0x3e000000;
@@ -56,21 +64,14 @@ static int __init ux500_l2x0_init(void)
/* 64KB way size */
aux_val |= (0x3 << L2X0_AUX_CTRL_WAY_SIZE_SHIFT);
+ outer_cache.write_sec = ux500_l2c310_write_sec;
+
/* 64KB way size, 8 way associativity, force WA */
if (of_have_populated_dt())
l2x0_of_init(aux_val, 0xc0000fff);
else
l2x0_init(l2x0_base, aux_val, 0xc0000fff);
- /*
- * We can't disable l2 as we are in non secure mode, currently
- * this seems be called only during kexec path. So let's
- * override outer.disable with nasty assignment until we have
- * some SMI service available.
- */
- outer_cache.disable = NULL;
- outer_cache.set_debug = NULL;
-
return 0;
}
Author: Russell King <rmk+kernel at arm.linux.org.uk>
Date: Sun Mar 16 20:52:25 2014 +0000
ARM: l2c: fix register naming
We have a mixture of different devices with different register layouts,
but we group all the bits together in an opaque mess. Split them out
into those which are L2C-310 specific and ones which refer to earlier
devices. Provide full auxiliary control register definitions.
Signed-off-by: Russell King <rmk+kernel at arm.linux.org.uk>
diff --git a/arch/arm/mach-ux500/cache-l2x0.c b/arch/arm/mach-ux500/cache-l2x0.cindex 5cc7e3625d8c..067c37a054fb 100644
--- a/arch/arm/mach-ux500/cache-l2x0.c
+++ b/arch/arm/mach-ux500/cache-l2x0.c
@@ -59,10 +59,10 @@ static int __init ux500_l2x0_init(void)
/* DBx540's L2 has 128KB way size */
if (cpu_is_ux540_family())
/* 128KB way size */
- aux_val |= (0x4 << L2X0_AUX_CTRL_WAY_SIZE_SHIFT);
+ aux_val |= L2C_AUX_CTRL_WAY_SIZE(4);
else
/* 64KB way size */
- aux_val |= (0x3 << L2X0_AUX_CTRL_WAY_SIZE_SHIFT);
+ aux_val |= L2C_AUX_CTRL_WAY_SIZE(3);
outer_cache.write_sec = ux500_l2c310_write_sec;
Author: Russell King <rmk+kernel at arm.linux.org.uk>
Date: Wed Mar 19 01:22:05 2014 +0000
ARM: l2c: ux500: remove associativity and way size from aux_ctrl
Signed-off-by: Russell King <rmk+kernel at arm.linux.org.uk>
diff --git a/arch/arm/mach-ux500/cache-l2x0.c b/arch/arm/mach-ux500/cache-l2x0.cindex 067c37a054fb..5b891d051054 100644
--- a/arch/arm/mach-ux500/cache-l2x0.c
+++ b/arch/arm/mach-ux500/cache-l2x0.c
@@ -45,8 +45,6 @@ static void ux500_l2c310_write_sec(unsigned long val, unsigned
static int __init ux500_l2x0_init(void)
{
- u32 aux_val = 0x3e000000;
-
if (cpu_is_u8500_family() || cpu_is_ux540_family())
l2x0_base = __io_address(U8500_L2CC_BASE);
else
@@ -56,21 +54,12 @@ static int __init ux500_l2x0_init(void)
/* Unlock before init */
ux500_l2x0_unlock();
- /* DBx540's L2 has 128KB way size */
- if (cpu_is_ux540_family())
- /* 128KB way size */
- aux_val |= L2C_AUX_CTRL_WAY_SIZE(4);
- else
- /* 64KB way size */
- aux_val |= L2C_AUX_CTRL_WAY_SIZE(3);
-
outer_cache.write_sec = ux500_l2c310_write_sec;
- /* 64KB way size, 8 way associativity, force WA */
if (of_have_populated_dt())
- l2x0_of_init(aux_val, 0xc0000fff);
+ l2x0_of_init(0x3e000000, 0xc00f0fff);
else
- l2x0_init(l2x0_base, aux_val, 0xc0000fff);
+ l2x0_init(l2x0_base, 0x3e000000, 0xc00f0fff);
return 0;
}
Author: Russell King <rmk+kernel at arm.linux.org.uk>
Date: Wed Mar 19 12:47:58 2014 +0000
ARM: l2c: ux500: don't try to change the L2 cache auxiliary control register
ux500 can't change the auxiliary control register, so there's no point
passing values to try and modify it to the l2x0 init functions.
Signed-off-by: Russell King <rmk+kernel at arm.linux.org.uk>
diff --git a/arch/arm/mach-ux500/cache-l2x0.c b/arch/arm/mach-ux500/cache-l2x0.cindex 5b891d051054..842ebedbdd1c 100644
--- a/arch/arm/mach-ux500/cache-l2x0.c
+++ b/arch/arm/mach-ux500/cache-l2x0.c
@@ -57,9 +57,9 @@ static int __init ux500_l2x0_init(void)
outer_cache.write_sec = ux500_l2c310_write_sec;
if (of_have_populated_dt())
- l2x0_of_init(0x3e000000, 0xc00f0fff);
+ l2x0_of_init(0, ~0);
else
- l2x0_init(l2x0_base, 0x3e000000, 0xc00f0fff);
+ l2x0_init(l2x0_base, 0, ~0);
return 0;
}
So the only difference between what you've ended up with is that I've
kept the l2x0_base stuff around and the legacy init. If you want the
legacy init to be killed, I'd be more than happy to add another patch
on top of my existing series to do that.
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