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[ARM] Kirkwood: support L2 writeback mode 

This patch allows booting Kirkwood with the L2 in writeback mode,
by reading the WT override bit from the L2 config register and
passing that into the Feroceon L2 init routine, instead of assuming
that the WT override bit will always be set

Signed-off-by: Saeed Bishara <saeed@marvell.com>
Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
This commit is contained in:
Saeed Bishara 2008-06-23 01:05:08 -11:00 committed by Nicolas Pitre
parent a10b188f19
commit 1338760329
2 changed files with 8 additions and 2 deletions
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7
arch/arm/mach-kirkwood/common.c
View File

@ -313,6 +313,11 @@ static char * __init kirkwood_id(void)
return "unknown 88F6000 variant";
}
static int __init is_l2_writethrough(void)
{
return !!(readl(L2_CONFIG_REG) & L2_WRITETHROUGH);
}
void __init kirkwood_init(void)
{
printk(KERN_INFO "Kirkwood: %s, TCLK=%d.\n",
@ -321,6 +326,6 @@ void __init kirkwood_init(void)
kirkwood_setup_cpu_mbus();
#ifdef CONFIG_CACHE_FEROCEON_L2
feroceon_l2_init(1);
feroceon_l2_init(is_l2_writethrough());
#endif
}

3
include/asm-arm/arch-kirkwood/kirkwood.h
View File

@ -49,7 +49,6 @@
#define BRIDGE_VIRT_BASE (KIRKWOOD_REGS_VIRT_BASE | 0x20000)
#define CPU_CONTROL (BRIDGE_VIRT_BASE | 0x0104)
#define CPU_RESET 0x00000002
//#define L2_WRITETHROUGH 0x00020000
#define RSTOUTn_MASK (BRIDGE_VIRT_BASE | 0x0108)
#define SOFT_RESET_OUT_EN 0x00000004
#define SYSTEM_SOFT_RESET (BRIDGE_VIRT_BASE | 0x010c)
@ -65,6 +64,8 @@
#define IRQ_CAUSE_HIGH_OFF 0x0010
#define IRQ_MASK_HIGH_OFF 0x0014
#define TIMER_VIRT_BASE (BRIDGE_VIRT_BASE | 0x0300)
#define L2_CONFIG_REG (BRIDGE_VIRT_BASE | 0x0128)
#define L2_WRITETHROUGH 0x00000010
/*
* Register Map