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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2011-05-23 15:15:27 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-05-23 15:15:27 -0700 |
| commit | 42cd71bf1e3a081b3150018bbf448cb6c8a844a5 (patch) | |
| tree | 4a5d2eb0444255e4ad827a76dbd1417dd3876db6 /arch/arm/mach-imx/cache-l2x0.c | |
| parent | f5039935ac685b3b9b8c13fbc33cac8643dee32e (diff) | |
| parent | 9a55d9752d8abfc62f1ab05ccc790d22a0c8e7c0 (diff) | |
Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm
* 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm: (137 commits)
ARM: bcmring: convert to use sp804 clockevents
ARM: bcmring: convert to sp804 clocksource
ARM: 6912/1: bcmring: Add clkdev table in init_early
clockevents: ARM sp804: obtain sp804 timer rate via clks
clockevents: ARM sp804: allow clockevent name to be specified
clocksource: ARM sp804: obtain sp804 timer rate via clks
clocksource: ARM sp804: allow clocksource name to be specified
clocksource: convert OMAP1 to 32-bit down counting clocksource
clocksource: convert MXS timrotv2 to 32-bit down counting clocksource
clocksource: convert SPEAr platforms 16-bit up counting clocksource
clocksource: convert Integrator/AP 16-bit down counting clocksource
clocksource: convert W90x900 24-bit down counting clocksource
clocksource: convert ARM 32-bit down counting clocksources
clocksource: convert ARM 32-bit up counting clocksources
clocksource: add common mmio clocksource
ARM: update sa1100 to reflect PXA updates
ARM: omap1: convert to using readl/writel instead of volatile struct
ARM: omap1: delete useless interrupt handler
ARM: s5p: consolidate selection of timer register
ARM: 6939/1: fix missing 'cpu_relax()' declaration
...
Diffstat (limited to 'arch/arm/mach-imx/cache-l2x0.c')
| -rw-r--r-- | arch/arm/mach-imx/cache-l2x0.c | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/arch/arm/mach-imx/cache-l2x0.c b/arch/arm/mach-imx/cache-l2x0.c new file mode 100644 index 000000000000..69d1322add3c --- /dev/null +++ b/arch/arm/mach-imx/cache-l2x0.c @@ -0,0 +1,56 @@ +/* + * Copyright (C) 2009-2010 Pengutronix + * Sascha Hauer <s.hauer@pengutronix.de> + * Juergen Beisert <j.beisert@pengutronix.de> + * + * This program is free software; you can redistribute it and/or modify it under + * the terms of the GNU General Public License version 2 as published by the + * Free Software Foundation. + */ + +#include <linux/init.h> +#include <linux/err.h> +#include <linux/kernel.h> + +#include <asm/hardware/cache-l2x0.h> + +#include <mach/hardware.h> + +static int mxc_init_l2x0(void) +{ + void __iomem *l2x0_base; + void __iomem *clkctl_base; + + if (!cpu_is_mx31() && !cpu_is_mx35()) + return 0; + +/* + * First of all, we must repair broken chip settings. There are some + * i.MX35 CPUs in the wild, comming with bogus L2 cache settings. These + * misconfigured CPUs will run amok immediately when the L2 cache gets enabled. + * Workaraound is to setup the correct register setting prior enabling the + * L2 cache. This should not hurt already working CPUs, as they are using the + * same value. + */ +#define L2_MEM_VAL 0x10 + + clkctl_base = ioremap(MX35_CLKCTL_BASE_ADDR, 4096); + if (clkctl_base != NULL) { + writel(0x00000515, clkctl_base + L2_MEM_VAL); + iounmap(clkctl_base); + } else { + pr_err("L2 cache: Cannot fix timing. Trying to continue without\n"); + } + + l2x0_base = ioremap(MX3x_L2CC_BASE_ADDR, 4096); + if (IS_ERR(l2x0_base)) { + printk(KERN_ERR "remapping L2 cache area failed with %ld\n", + PTR_ERR(l2x0_base)); + return 0; + } + + l2x0_init(l2x0_base, 0x00030024, 0x00000000); + + return 0; +} +arch_initcall(mxc_init_l2x0); |