diff options
| author | Jingchang Lu <b35083@freescale.com> | 2014-10-31 17:01:13 +0800 |
|---|---|---|
| committer | Shawn Guo <shawn.guo@linaro.org> | 2014-11-23 14:56:21 +0800 |
| commit | 4e3fea4a950e3ec22ec8f99a7438aa5ba584263a (patch) | |
| tree | c460e261dcc12181346e0582621bbb6e0b69df3d /arch/arm/mach-imx/platsmp.c | |
| parent | 7f0fb6104b3a9c48d7b253d3984d3a619bb1e654 (diff) | |
| download | op-kernel-dev-4e3fea4a950e3ec22ec8f99a7438aa5ba584263a.zip op-kernel-dev-4e3fea4a950e3ec22ec8f99a7438aa5ba584263a.tar.gz | |
ARM: imx: Add Freescale LS1021A SMP support
Freescale LS1021A SoCs deploy two cortex-A7 processors,
this adds bring-up support for the secondary core.
Signed-off-by: Jingchang Lu <b35083@freescale.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Diffstat (limited to 'arch/arm/mach-imx/platsmp.c')
| -rw-r--r-- | arch/arm/mach-imx/platsmp.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/arch/arm/mach-imx/platsmp.c b/arch/arm/mach-imx/platsmp.c index 771bd25..7f27001 100644 --- a/arch/arm/mach-imx/platsmp.c +++ b/arch/arm/mach-imx/platsmp.c @@ -11,7 +11,10 @@ */ #include <linux/init.h> +#include <linux/of_address.h> +#include <linux/of.h> #include <linux/smp.h> + #include <asm/cacheflush.h> #include <asm/page.h> #include <asm/smp_scu.h> @@ -94,3 +97,33 @@ struct smp_operations imx_smp_ops __initdata = { .cpu_kill = imx_cpu_kill, #endif }; + +#define DCFG_CCSR_SCRATCHRW1 0x200 + +static int ls1021a_boot_secondary(unsigned int cpu, struct task_struct *idle) +{ + arch_send_wakeup_ipi_mask(cpumask_of(cpu)); + + return 0; +} + +static void __init ls1021a_smp_prepare_cpus(unsigned int max_cpus) +{ + struct device_node *np; + void __iomem *dcfg_base; + unsigned long paddr; + + np = of_find_compatible_node(NULL, NULL, "fsl,ls1021a-dcfg"); + dcfg_base = of_iomap(np, 0); + BUG_ON(!dcfg_base); + + paddr = virt_to_phys(secondary_startup); + writel_relaxed(cpu_to_be32(paddr), dcfg_base + DCFG_CCSR_SCRATCHRW1); + + iounmap(dcfg_base); +} + +struct smp_operations ls1021a_smp_ops __initdata = { + .smp_prepare_cpus = ls1021a_smp_prepare_cpus, + .smp_boot_secondary = ls1021a_boot_secondary, +}; |
