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ARM: CSR: initializing L2 cache

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Signed-off-by: Rongjun Ying <rongjun.ying@csr.com>
Signed-off-by: Barry Song <baohua.song@csr.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Rongjun Ying 2011-07-08 02:40:14 -07:00 committed by Barry Song
parent 31adb06f9d
commit 89e162afd3
2 changed files with 60 additions and 0 deletions
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1
arch/arm/mach-prima2/Makefile
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@ -4,3 +4,4 @@ obj-y += clock.o
obj-y += rstc.o
obj-y += prima2.o
obj-$(CONFIG_DEBUG_LL) += lluart.o
obj-$(CONFIG_CACHE_L2X0) += l2x0.o

59
arch/arm/mach-prima2/l2x0.c Normal file
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@ -0,0 +1,59 @@
/*
* l2 cache initialization for CSR SiRFprimaII
*
* Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company.
*
* Licensed under GPLv2 or later.
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/io.h>
#include <linux/errno.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <asm/hardware/cache-l2x0.h>
#include <mach/memory.h>
#define L2X0_ADDR_FILTERING_START 0xC00
#define L2X0_ADDR_FILTERING_END 0xC04
static struct of_device_id l2x_ids[] = {
{ .compatible = "arm,pl310-cache" },
};
static int __init sirfsoc_of_l2x_init(void)
{
struct device_node *np;
void __iomem *sirfsoc_l2x_base;
np = of_find_matching_node(NULL, l2x_ids);
if (!np)
panic("unable to find compatible l2x node in dtb\n");
sirfsoc_l2x_base = of_iomap(np, 0);
if (!sirfsoc_l2x_base)
panic("unable to map l2x cpu registers\n");
of_node_put(np);
if (!(readl_relaxed(sirfsoc_l2x_base + L2X0_CTRL) & 1)) {
/*
* set the physical memory windows L2 cache will cover
*/
writel_relaxed(PLAT_PHYS_OFFSET + 1024 * 1024 * 1024,
sirfsoc_l2x_base + L2X0_ADDR_FILTERING_END);
writel_relaxed(PLAT_PHYS_OFFSET | 0x1,
sirfsoc_l2x_base + L2X0_ADDR_FILTERING_START);
writel_relaxed(0,
sirfsoc_l2x_base + L2X0_TAG_LATENCY_CTRL);
writel_relaxed(0,
sirfsoc_l2x_base + L2X0_DATA_LATENCY_CTRL);
}
l2x0_init((void __iomem *)sirfsoc_l2x_base, 0x00040000,
0x00000000);
return 0;
}
early_initcall(sirfsoc_of_l2x_init);